Import section 2 man files so I can update jail(2).

192 files changed, 34710 insertions, 0 deletions

diff --git a/lib/libc/sys/Makefile.inc b/lib/libc/sys/Makefile.inc
new file mode 100644
index 0000000..09d4016
--- /dev/null
+++ b/lib/libc/sys/Makefile.inc
@@ -0,0 +1,195 @@
+#	@(#)Makefile.inc	8.3 (Berkeley) 10/24/94
+# $FreeBSD$
+
+# sys sources
+.PATH: ${.CURDIR}/${LIBC_ARCH}/sys ${.CURDIR}/sys
+
+# Include the generated makefile containing the *complete* list
+# of syscall names in MIASM.
+.include "${.CURDIR}/../../sys/sys/syscall.mk"
+
+# Include machine dependent definitions.
+#
+# MDASM names override the default syscall names in MIASM.
+# NOASM will prevent the default syscall code from being generated.
+#
+.sinclude "${.CURDIR}/${LIBC_ARCH}/sys/Makefile.inc"
+
+# Sources common to both syscall interfaces:
+SRCS+=	stack_protector.c stack_protector_compat.c __error.c
+.if !defined(WITHOUT_SYSCALL_COMPAT)
+SRCS+=	fcntl.c ftruncate.c lseek.c mmap.c pread.c pwrite.c truncate.c
+PSEUDO+= _fcntl.o
+.endif
+SRCS+= sigwait.c
+NOASM+= sigwait.o
+PSEUDO+= _sigwait.o
+
+# Add machine dependent asm sources:
+SRCS+=${MDASM}
+
+# Look though the complete list of syscalls (MIASM) for names that are
+# not defined with machine dependent implementations (MDASM) and are
+# not declared for no generation of default code (NOASM).  Add each
+# syscall that satisfies these conditions to the ASM list.
+.for _asm in ${MIASM}
+.if (${MDASM:R:M${_asm:R}} == "")
+.if (${NOASM:R:M${_asm:R}} == "")
+ASM+=$(_asm)
+.endif
+.endif
+.endfor
+
+OBJS+=	${ASM} ${PSEUDO}
+
+SASM=	${ASM:S/.o/.S/}
+
+SPSEUDO= ${PSEUDO:S/.o/.S/}
+
+SRCS+=	${SASM} ${SPSEUDO}
+
+SYM_MAPS+=	${.CURDIR}/sys/Symbol.map
+
+# Generated files
+CLEANFILES+=	${SASM} ${SPSEUDO}
+
+${SASM}:
+	printf '#include "compat.h"\n' > ${.TARGET}
+	printf '#include "SYS.h"\nRSYSCALL(${.PREFIX})\n' >> ${.TARGET}
+
+${SPSEUDO}:
+	printf '#include "compat.h"\n' > ${.TARGET}
+	printf '#include "SYS.h"\nPSEUDO(${.PREFIX:S/_//})\n' \
+	    >> ${.TARGET}
+
+MAN+=	abort2.2 accept.2 access.2 acct.2 adjtime.2 \
+	aio_cancel.2 aio_error.2 aio_read.2 aio_return.2 \
+	aio_suspend.2 aio_waitcomplete.2 aio_write.2 \
+	bind.2 brk.2 chdir.2 chflags.2 \
+	chmod.2 chown.2 chroot.2 clock_gettime.2 close.2 closefrom.2 \
+	connect.2 cpuset.2 cpuset_getaffinity.2 dup.2 execve.2 _exit.2 \
+	extattr_get_file.2 fcntl.2 fhopen.2 flock.2 fork.2 fsync.2 \
+	getdirentries.2 getdtablesize.2 \
+	getfh.2 getfsstat.2 getgid.2 getgroups.2 getitimer.2 getlogin.2 \
+	getpeername.2 getpgrp.2 getpid.2 getpriority.2 getrlimit.2 \
+	getrusage.2 getsid.2 getsockname.2 \
+	getsockopt.2 gettimeofday.2 getuid.2 \
+	intro.2 ioctl.2 issetugid.2 jail.2 kenv.2 kill.2 \
+	kldfind.2 kldfirstmod.2 kldload.2 kldnext.2 kldstat.2 kldsym.2 \
+	kldunload.2 kqueue.2 ktrace.2 link.2 lio_listio.2 listen.2 \
+	lseek.2 \
+	madvise.2 mincore.2 minherit.2 mkdir.2 mkfifo.2 mknod.2 mlock.2 \
+	mlockall.2 mmap.2 modfind.2 modnext.2 modstat.2 mount.2 mprotect.2 \
+	mq_close.2 mq_getattr.2 mq_notify.2 mq_open.2 mq_receive.2 mq_send.2 \
+	mq_setattr.2 \
+	msgctl.2 msgget.2 msgrcv.2 msgsnd.2 \
+	msync.2 munmap.2 nanosleep.2 nfssvc.2 ntp_adjtime.2 open.2 \
+	pathconf.2 pipe.2 poll.2 posix_openpt.2 profil.2 \
+	pselect.2 ptrace.2 quotactl.2 \
+	read.2 readlink.2 reboot.2 recv.2 rename.2 revoke.2 rfork.2 rmdir.2 \
+	rtprio.2
+.if !defined(NO_P1003_1B)
+MAN+=	sched_get_priority_max.2 sched_setparam.2 \
+	sched_setscheduler.2 sched_yield.2
+.endif
+MAN+=	sctp_generic_recvmsg.2 sctp_generic_sendmsg.2 sctp_peeloff.2 \
+	select.2 semctl.2 semget.2 semop.2 send.2 setfib.2 sendfile.2 \
+	setgroups.2 setpgid.2 setregid.2 setresuid.2 setreuid.2 setsid.2 \
+	setuid.2 shmat.2 shmctl.2 shmget.2 shm_open.2 shutdown.2 \
+	sigaction.2 sigaltstack.2 sigpending.2 sigprocmask.2 sigqueue.2 \
+	sigreturn.2 sigstack.2 sigsuspend.2 sigwait.2 sigwaitinfo.2 \
+	socket.2 socketpair.2 stat.2 statfs.2 \
+	swapon.2 symlink.2 sync.2 sysarch.2 syscall.2 \
+	timer_create.2 timer_delete.2 timer_settime.2 \
+	truncate.2 umask.2 undelete.2 \
+	unlink.2 utimes.2 utrace.2 uuidgen.2 vfork.2 wait.2 write.2
+
+MLINKS+=access.2 eaccess.2 access.2 faccessat.2
+MLINKS+=brk.2 sbrk.2
+MLINKS+=chdir.2 fchdir.2
+MLINKS+=chflags.2 fchflags.2 chflags.2 lchflags.2
+MLINKS+=chmod.2 fchmod.2 chmod.2 fchmodat.2 chmod.2 lchmod.2
+MLINKS+=chown.2 fchown.2 chown.2 fchownat.2 chown.2 lchown.2
+MLINKS+=clock_gettime.2 clock_getres.2 clock_gettime.2 clock_settime.2
+MLINKS+=cpuset.2 cpuset_getid.2 cpuset.2 cpuset_setid.2
+MLINKS+=cpuset_getaffinity.2 cpuset_setaffinity.2
+MLINKS+=dup.2 dup2.2
+MLINKS+=execve.2 fexecve.2
+MLINKS+=extattr_get_file.2 extattr.2 \
+	extattr_get_file.2 extattr_delete_fd.2 \
+	extattr_get_file.2 extattr_delete_file.2 \
+	extattr_get_file.2 extattr_delete_list.2 \
+	extattr_get_file.2 extattr_get_fd.2 \
+	extattr_get_file.2 extattr_get_list.2 \
+	extattr_get_file.2 extattr_list_fd.2 \
+	extattr_get_file.2 extattr_list_file.2 \
+	extattr_get_file.2 extattr_list_link.2 \
+	extattr_get_file.2 extattr_set_fd.2 \
+	extattr_get_file.2 extattr_set_file.2 \
+	extattr_get_file.2 extattr_set_link.2
+MLINKS+=fhopen.2 fhstat.2 fhopen.2 fhstatfs.2
+MLINKS+=getdirentries.2 getdents.2
+MLINKS+=getfh.2 lgetfh.2
+MLINKS+=getgid.2 getegid.2
+MLINKS+=getitimer.2 setitimer.2
+MLINKS+=getlogin.2 getlogin_r.3
+MLINKS+=getlogin.2 setlogin.2
+MLINKS+=getpgrp.2 getpgid.2
+MLINKS+=getpid.2 getppid.2
+MLINKS+=getpriority.2 setpriority.2
+MLINKS+=getrlimit.2 setrlimit.2
+MLINKS+=getsockopt.2 setsockopt.2
+MLINKS+=gettimeofday.2 settimeofday.2
+MLINKS+=getuid.2 geteuid.2
+MLINKS+=intro.2 errno.2
+MLINKS+=jail.2 jail_attach.2 \
+	jail.2 jail_get.2 \
+	jail.2 jail_remove.2 \
+	jail.2 jail_set.2
+MLINKS+=kldunload.2 kldunloadf.2
+MLINKS+=kqueue.2 kevent.2
+MLINKS+=link.2 linkat.2
+MLINKS+=madvise.2 posix_madvise.2
+MLINKS+=mkdir.2 mkdirat.2
+MLINKS+=mkfifo.2 mkfifoat.2
+MLINKS+=mknod.2 mknodat.2
+MLINKS+=mlock.2 munlock.2
+MLINKS+=mlockall.2 munlockall.2
+MLINKS+=modnext.2 modfnext.2
+MLINKS+=mount.2 nmount.2 mount.2 unmount.2
+MLINKS+=mq_receive.2 mq_timedreceive.2
+MLINKS+=mq_send.2 mq_timedsend.2
+MLINKS+=ntp_adjtime.2 ntp_gettime.2
+MLINKS+=open.2 openat.2
+MLINKS+=pathconf.2 fpathconf.2
+MLINKS+=pathconf.2 lpathconf.2
+MLINKS+=read.2 pread.2 read.2 preadv.2 read.2 readv.2
+MLINKS+=readlink.2 readlinkat.2
+MLINKS+=recv.2 recvfrom.2 recv.2 recvmsg.2
+MLINKS+=rename.2 renameat.2
+.if !defined(NO_P1003_1B)
+MLINKS+=sched_get_priority_max.2 sched_get_priority_min.2 \
+	sched_get_priority_max.2 sched_rr_get_interval.2
+MLINKS+=sched_setparam.2 sched_getparam.2
+MLINKS+=sched_setscheduler.2 sched_getscheduler.2
+.endif
+MLINKS+=select.2 FD_CLR.3 select.2 FD_ISSET.3 select.2 FD_SET.3 \
+	select.2 FD_ZERO.3
+MLINKS+=send.2 sendmsg.2 send.2 sendto.2
+MLINKS+=setpgid.2 setpgrp.2
+MLINKS+=setresuid.2 getresgid.2 setresuid.2 getresuid.2 setresuid.2 setresgid.2
+MLINKS+=setuid.2 setegid.2 setuid.2 seteuid.2 setuid.2 setgid.2
+MLINKS+=shmat.2 shmdt.2
+MLINKS+=shm_open.2 shm_unlink.2
+MLINKS+=sigwaitinfo.2 sigtimedwait.2
+MLINKS+=stat.2 fstat.2 stat.2 fstatat.2 stat.2 lstat.2
+MLINKS+=statfs.2 fstatfs.2
+MLINKS+=swapon.2 swapoff.2
+MLINKS+=symlink.2 symlinkat.2
+MLINKS+=syscall.2 __syscall.2
+MLINKS+=timer_settime.2 timer_getoverrun.2 timer_settime.2 timer_gettime.2
+MLINKS+=truncate.2 ftruncate.2
+MLINKS+=unlink.2 unlinkat.2
+MLINKS+=utimes.2 futimes.2 utimes.2 futimesat.2 utimes.2 lutimes.2
+MLINKS+=wait.2 wait3.2 wait.2 wait4.2 wait.2 waitpid.2
+MLINKS+=write.2 pwrite.2 write.2 pwritev.2 write.2 writev.2
diff --git a/lib/libc/sys/Symbol.map b/lib/libc/sys/Symbol.map
new file mode 100644
index 0000000..74751f9
--- /dev/null
+++ b/lib/libc/sys/Symbol.map
@@ -0,0 +1,1001 @@
+/*
+ * $FreeBSD$
+ */
+
+/*
+ * It'd be nice to have this automatically generated, but we don't
+ * know to what version they will eventually belong, so for now
+ * it has to be manual.
+ */
+FBSD_1.0 {
+	__acl_aclcheck_fd;
+	__acl_aclcheck_file;
+	__acl_aclcheck_link;
+	__acl_delete_fd;
+	__acl_delete_file;
+	__acl_delete_link;
+	__acl_get_fd;
+	__acl_get_file;
+	__acl_get_link;
+	__acl_set_fd;
+	__acl_set_file;
+	__acl_set_link;
+	__getcwd;
+	__mac_execve;
+	__mac_get_fd;
+	__mac_get_file;
+	__mac_get_link;
+	__mac_get_pid;
+	__mac_get_proc;
+	__mac_set_fd;
+	__mac_set_file;
+	__mac_set_link;
+	__mac_set_proc;
+	__setugid;
+	__syscall;
+	__sysctl;
+	_umtx_lock;
+	_umtx_op;
+	_umtx_unlock;
+	abort2;
+	accept;
+	access;
+	acct;
+	adjtime;
+	aio_cancel;
+	aio_error;
+	aio_fsync;
+	aio_read;
+	aio_return;
+	aio_suspend;
+	aio_waitcomplete;
+	aio_write;
+	audit;
+	auditctl;
+	auditon;
+	bind;
+	chdir;
+	chflags;
+	__chk_fail;
+	chmod;
+	chown;
+	chroot;
+	clock_getres;
+	clock_gettime;
+	clock_settime;
+	close;
+	connect;
+	dup;
+	dup2;
+	eaccess;
+	execve;
+	extattr_delete_fd;
+	extattr_delete_file;
+	extattr_delete_link;
+	extattr_get_fd;
+	extattr_get_file;
+	extattr_get_link;
+	extattr_list_fd;
+	extattr_list_file;
+	extattr_list_link;
+	extattr_set_fd;
+	extattr_set_file;
+	extattr_set_link;
+	extattrctl;
+	fchdir;
+	fchflags;
+	fchmod;
+	fchown;
+	fcntl;
+	fhopen;
+	fhstat;
+	fhstatfs;
+	flock;
+	fork;
+	fpathconf;
+	fstat;
+	fstatfs;
+	fsync;
+	futimes;
+	getaudit;
+	getaudit_addr;
+	getauid;
+	getcontext;
+	getdents;
+	getdirentries;
+	getdtablesize;
+	getegid;
+	geteuid;
+	getfh;
+	getfsstat;
+	getgid;
+	getgroups;
+	getitimer;
+	getpeername;
+	getpgid;
+	getpgrp;
+	getpid;
+	getppid;
+	getpriority;
+	getresgid;
+	getresuid;
+	getrlimit;
+	getrusage;
+	getsid;
+	getsockname;
+	getsockopt;
+	gettimeofday;
+	getuid;
+	ioctl;
+	issetugid;
+	jail;
+	jail_attach;
+	kenv;
+	kevent;
+	kill;
+	kldfind;
+	kldfirstmod;
+	kldload;
+	kldnext;
+	kldstat;
+	kldsym;
+	kldunload;
+	kldunloadf;
+	kqueue;
+	kmq_notify;		/* Do we want these to be public interfaces? */
+	kmq_open;		/* librt uses them to provide mq_xxx. */
+	kmq_setattr;
+	kmq_timedreceive;
+	kmq_timedsend;
+	kmq_unlink;
+	ksem_close;
+	ksem_destroy;
+	ksem_getvalue;
+	ksem_init;
+	ksem_open;
+	ksem_post;
+	ksem_timedwait;
+	ksem_trywait;
+	ksem_unlink;
+	ksem_wait;
+	ktrace;
+	lchflags;
+	lchmod;
+	lchown;
+	lgetfh;
+	link;
+	lio_listio;
+	listen;
+	lstat;
+	lutimes;
+	mac_syscall;
+	madvise;
+	mincore;
+	minherit;
+	mkdir;
+	mkfifo;
+	mknod;
+	mlock;
+	mlockall;
+	modfind;
+	modfnext;
+	modnext;
+	modstat;
+	mount;
+	mprotect;
+	msgget;
+	msgrcv;
+	msgsnd;
+	msgsys;
+	msync;
+	munlock;
+	munlockall;
+	munmap;
+	nanosleep;
+	netbsd_lchown;
+	netbsd_msync;
+	nfssvc;
+	nfstat;
+	nlstat;
+	nmount;
+	nstat;
+	ntp_adjtime;
+	ntp_gettime;
+	oaio_read;
+	oaio_write;
+	olio_listio;
+	open;
+	pathconf;
+	pipe;
+	poll;
+	posix_openpt;
+	preadv;
+	profil;
+	pselect;
+	ptrace;
+	pwritev;
+	quotactl;
+	read;
+	readlink;
+	readv;
+	reboot;
+	recvfrom;
+	recvmsg;
+	rename;
+	revoke;
+	rfork;
+	rmdir;
+	rtprio;
+	rtprio_thread;
+	sched_get_priority_max;
+	sched_get_priority_min;
+	sched_getparam;
+	sched_getscheduler;
+	sched_rr_get_interval;
+	sched_setparam;
+	sched_setscheduler;
+	sched_yield;
+	select;
+	semget;
+	semop;
+	semsys;
+	sendfile;
+	sendmsg;
+	sendto;
+	setaudit;
+	setaudit_addr;
+	setauid;
+	setcontext;
+	setegid;
+	seteuid;
+	setgid;
+	setgroups;
+	setitimer;
+	setlogin;
+	setpgid;
+	setpriority;
+	setregid;
+	setresgid;
+	setresuid;
+	setreuid;
+	setrlimit;
+	setsid;
+	setsockopt;
+	settimeofday;
+	setuid;
+	shm_open;
+	shm_unlink;
+	shmat;
+	shmdt;
+	shmget;
+	shmsys;
+	shutdown;
+	sigaction;
+	sigaltstack;
+	sigpending;
+	sigprocmask;
+	sigqueue;
+	sigreturn;
+	sigsuspend;
+	sigtimedwait;
+	sigwait;
+	sigwaitinfo;
+	socket;
+	socketpair;
+	__stack_chk_fail;
+	__stack_chk_guard;
+	stat;
+	statfs;
+	swapcontext;
+	swapoff;
+	swapon;
+	symlink;
+	sync;
+	sysarch;
+	syscall;
+	thr_create;
+	thr_exit;
+	thr_kill;
+	thr_kill2;
+	thr_new;
+	thr_self;
+	thr_set_name;
+	thr_suspend;
+	thr_wake;
+	ktimer_create;		/* Do we want these to be public interfaces? */
+	ktimer_delete;		/* librt uses them to provide timer_xxx. */
+	ktimer_getoverrun;
+	ktimer_gettime;
+	ktimer_settime;
+	umask;
+	undelete;
+	unlink;
+	unmount;
+	utimes;
+	utrace;
+	uuidgen;
+	vadvise;
+	wait4;
+	write;
+	writev;
+
+	__error;
+	ftruncate;
+	lseek;
+	mmap;
+	pread;
+	pwrite;
+	truncate;
+};
+
+FBSD_1.1 {
+	__semctl;
+	closefrom;
+	cpuset;
+	cpuset_getid;
+	cpuset_setid;
+	cpuset_getaffinity;
+	cpuset_setaffinity;
+	faccessat;
+	fchmodat;
+	fchownat;
+	fexecve;
+	fstatat;
+	futimesat;
+	jail_get;
+	jail_set;
+	jail_remove;
+	linkat;
+	lpathconf;
+	mkdirat;
+	mkfifoat;
+	mknodat;
+	msgctl;
+	openat;
+	readlinkat;
+	renameat;
+	setfib;
+	shmctl;
+	symlinkat;
+	unlinkat;
+};
+
+FBSDprivate_1.0 {
+	___acl_aclcheck_fd;
+	__sys___acl_aclcheck_fd;
+	___acl_aclcheck_file;
+	__sys___acl_aclcheck_file;
+	___acl_aclcheck_link;
+	__sys___acl_aclcheck_link;
+	___acl_delete_fd;
+	__sys___acl_delete_fd;
+	___acl_delete_file;
+	__sys___acl_delete_file;
+	___acl_delete_link;
+	__sys___acl_delete_link;
+	___acl_get_fd;
+	__sys___acl_get_fd;
+	___acl_get_file;
+	__sys___acl_get_file;
+	___acl_get_link;
+	__sys___acl_get_link;
+	___acl_set_fd;
+	__sys___acl_set_fd;
+	___acl_set_file;
+	__sys___acl_set_file;
+	___acl_set_link;
+	__sys___acl_set_link;
+	___getcwd;
+	__sys___getcwd;
+	___mac_execve;
+	__sys___mac_execve;
+	___mac_get_fd;
+	__sys___mac_get_fd;
+	___mac_get_file;
+	__sys___mac_get_file;
+	___mac_get_link;
+	__sys___mac_get_link;
+	___mac_get_pid;
+	__sys___mac_get_pid;
+	___mac_get_proc;
+	__sys___mac_get_proc;
+	___mac_set_fd;
+	__sys___mac_set_fd;
+	___mac_set_file;
+	__sys___mac_set_file;
+	___mac_set_link;
+	__sys___mac_set_link;
+	___mac_set_proc;
+	__sys___mac_set_proc;
+	___semctl;
+	__sys___semctl;
+	___setugid;
+	__sys___setugid;
+	___syscall;
+	__sys___syscall;
+	___sysctl;
+	__sys___sysctl;
+	__umtx_lock;
+	__sys__umtx_lock;
+	__umtx_op;
+	__sys__umtx_op;
+	__umtx_unlock;
+	__sys__umtx_unlock;
+	_abort2;
+	__sys_abort2;
+	_accept;
+	__sys_accept;
+	_access;
+	__sys_access;
+	_acct;
+	__sys_acct;
+	_adjtime;
+	__sys_adjtime;
+	_aio_cancel;
+	__sys_aio_cancel;
+	_aio_error;
+	__sys_aio_error;
+	_aio_fsync;
+	__sys_aio_fsync;
+	_aio_read;
+	__sys_aio_read;
+	_aio_return;
+	__sys_aio_return;
+	_aio_suspend;
+	__sys_aio_suspend;
+	_aio_waitcomplete;
+	__sys_aio_waitcomplete;
+	_aio_write;
+	__sys_aio_write;
+	_audit;
+	__sys_audit;
+	_auditctl;
+	__sys_auditctl;
+	_auditon;
+	__sys_auditon;
+	_bind;
+	__sys_bind;
+	_chdir;
+	__sys_chdir;
+	_chflags;
+	__sys_chflags;
+	_chmod;
+	__sys_chmod;
+	_chown;
+	__sys_chown;
+	_chroot;
+	__sys_chroot;
+	_clock_getres;
+	__sys_clock_getres;
+	_clock_gettime;
+	__sys_clock_gettime;
+	_clock_settime;
+	__sys_clock_settime;
+	_close;
+	__sys_close;
+	_closefrom;
+	__sys_closefrom;
+	_connect;
+	__sys_connect;
+	_cpuset;
+	__sys_cpuset;
+	_cpuset_getid;
+	__sys_cpuset_getid;
+	_cpuset_setid;
+	__sys_cpuset_setid;
+	_cpuset_getaffinity;
+	__sys_cpuset_getaffinity;
+	_cpuset_setaffinity;
+	__sys_cpuset_setaffinity;
+	_dup;
+	__sys_dup;
+	_dup2;
+	__sys_dup2;
+	_eaccess;
+	__sys_eaccess;
+	_execve;
+	__sys_execve;
+	_extattr_delete_fd;
+	__sys_extattr_delete_fd;
+	_extattr_delete_file;
+	__sys_extattr_delete_file;
+	_extattr_delete_link;
+	__sys_extattr_delete_link;
+	_extattr_get_fd;
+	__sys_extattr_get_fd;
+	_extattr_get_file;
+	__sys_extattr_get_file;
+	_extattr_get_link;
+	__sys_extattr_get_link;
+	_extattr_list_fd;
+	__sys_extattr_list_fd;
+	_extattr_list_file;
+	__sys_extattr_list_file;
+	_extattr_list_link;
+	__sys_extattr_list_link;
+	_extattr_set_fd;
+	__sys_extattr_set_fd;
+	_extattr_set_file;
+	__sys_extattr_set_file;
+	_extattr_set_link;
+	__sys_extattr_set_link;
+	_extattrctl;
+	__sys_extattrctl;
+	_fchdir;
+	__sys_fchdir;
+	_fchflags;
+	__sys_fchflags;
+	_fchmod;
+	__sys_fchmod;
+	_fchown;
+	__sys_fchown;
+	_fcntl;
+	__sys_fcntl;
+	__fcntl_compat;
+	_fhopen;
+	__sys_fhopen;
+	_fhstat;
+	__sys_fhstat;
+	_fhstatfs;
+	__sys_fhstatfs;
+	_flock;
+	__sys_flock;
+	_fork;
+	__sys_fork;
+	_fpathconf;
+	__sys_fpathconf;
+	_fstat;
+	__sys_fstat;
+	_fstatfs;
+	__sys_fstatfs;
+	_fsync;
+	__sys_fsync;
+	_futimes;
+	__sys_futimes;
+	_getaudit;
+	__sys_getaudit;
+	_getaudit_addr;
+	__sys_getaudit_addr;
+	_getauid;
+	__sys_getauid;
+	_getcontext;
+	__sys_getcontext;
+	_getdents;
+	__sys_getdents;
+	_getdirentries;
+	__sys_getdirentries;
+	_getdtablesize;
+	__sys_getdtablesize;
+	_getegid;
+	__sys_getegid;
+	_geteuid;
+	__sys_geteuid;
+	_getfh;
+	__sys_getfh;
+	_getfsstat;
+	__sys_getfsstat;
+	_getgid;
+	__sys_getgid;
+	_getgroups;
+	__sys_getgroups;
+	_getitimer;
+	__sys_getitimer;
+	_getpeername;
+	__sys_getpeername;
+	_getpgid;
+	__sys_getpgid;
+	_getpgrp;
+	__sys_getpgrp;
+	_getpid;
+	__sys_getpid;
+	_getppid;
+	__sys_getppid;
+	_getpriority;
+	__sys_getpriority;
+	_getresgid;
+	__sys_getresgid;
+	_getresuid;
+	__sys_getresuid;
+	_getrlimit;
+	__sys_getrlimit;
+	_getrusage;
+	__sys_getrusage;
+	_getsid;
+	__sys_getsid;
+	_getsockname;
+	__sys_getsockname;
+	_getsockopt;
+	__sys_getsockopt;
+	_gettimeofday;
+	__sys_gettimeofday;
+	_getuid;
+	__sys_getuid;
+	_ioctl;
+	__sys_ioctl;
+	_issetugid;
+	__sys_issetugid;
+	_jail;
+	__sys_jail;
+	_jail_attach;
+	__sys_jail_attach;
+	_kenv;
+	__sys_kenv;
+	_kevent;
+	__sys_kevent;
+	_kill;
+	__sys_kill;
+	_kldfind;
+	__sys_kldfind;
+	_kldfirstmod;
+	__sys_kldfirstmod;
+	_kldload;
+	__sys_kldload;
+	_kldnext;
+	__sys_kldnext;
+	_kldstat;
+	__sys_kldstat;
+	_kldsym;
+	__sys_kldsym;
+	_kldunload;
+	__sys_kldunload;
+	_kldunloadf;
+	__sys_kldunloadf;
+	_kmq_notify;
+	__sys_kmq_notify;
+	_kmq_open;
+	__sys_kmq_open;
+	_kmq_setattr;
+	__sys_kmq_setattr;
+	_kmq_timedreceive;
+	__sys_kmq_timedreceive;
+	_kmq_timedsend;
+	__sys_kmq_timedsend;
+	_kmq_unlink;
+	__sys_kmq_unlink;
+	_kqueue;
+	__sys_kqueue;
+	_ksem_close;
+	__sys_ksem_close;
+	_ksem_destroy;
+	__sys_ksem_destroy;
+	_ksem_getvalue;
+	__sys_ksem_getvalue;
+	_ksem_init;
+	__sys_ksem_init;
+	_ksem_open;
+	__sys_ksem_open;
+	_ksem_post;
+	__sys_ksem_post;
+	_ksem_timedwait;
+	__sys_ksem_timedwait;
+	_ksem_trywait;
+	__sys_ksem_trywait;
+	_ksem_unlink;
+	__sys_ksem_unlink;
+	_ksem_wait;
+	__sys_ksem_wait;
+	_ktrace;
+	__sys_ktrace;
+	_lchflags;
+	__sys_lchflags;
+	_lchmod;
+	__sys_lchmod;
+	_lchown;
+	__sys_lchown;
+	_lgetfh;
+	__sys_lgetfh;
+	_link;
+	__sys_link;
+	_lio_listio;
+	__sys_lio_listio;
+	_listen;
+	__sys_listen;
+	_lstat;
+	__sys_lstat;
+	_lutimes;
+	__sys_lutimes;
+	_mac_syscall;
+	__sys_mac_syscall;
+	_madvise;
+	__sys_madvise;
+	_mincore;
+	__sys_mincore;
+	_minherit;
+	__sys_minherit;
+	_mkdir;
+	__sys_mkdir;
+	_mkfifo;
+	__sys_mkfifo;
+	_mknod;
+	__sys_mknod;
+	_mlock;
+	__sys_mlock;
+	_mlockall;
+	__sys_mlockall;
+	_modfind;
+	__sys_modfind;
+	_modfnext;
+	__sys_modfnext;
+	_modnext;
+	__sys_modnext;
+	_modstat;
+	__sys_modstat;
+	_mount;
+	__sys_mount;
+	_mprotect;
+	__sys_mprotect;
+	_msgctl;
+	__sys_msgctl;
+	_msgget;
+	__sys_msgget;
+	_msgrcv;
+	__sys_msgrcv;
+	_msgsnd;
+	__sys_msgsnd;
+	_msgsys;
+	__sys_msgsys;
+	_msync;
+	__sys_msync;
+	_munlock;
+	__sys_munlock;
+	_munlockall;
+	__sys_munlockall;
+	_munmap;
+	__sys_munmap;
+	_nanosleep;
+	__sys_nanosleep;
+	_netbsd_lchown;
+	__sys_netbsd_lchown;
+	_netbsd_msync;
+	__sys_netbsd_msync;
+	_nfssvc;
+	__sys_nfssvc;
+	_nfstat;
+	__sys_nfstat;
+	_nlstat;
+	__sys_nlstat;
+	_nmount;
+	__sys_nmount;
+	_nstat;
+	__sys_nstat;
+	_ntp_adjtime;
+	__sys_ntp_adjtime;
+	_ntp_gettime;
+	__sys_ntp_gettime;
+	_oaio_read;
+	__sys_oaio_read;
+	_oaio_write;
+	__sys_oaio_write;
+	_olio_listio;
+	__sys_olio_listio;
+	_open;
+	__sys_open;
+	_openat;
+	__sys_openat;
+	_pathconf;
+	__sys_pathconf;
+	_pipe;
+	__sys_pipe;
+	_poll;
+	__sys_poll;
+	_preadv;
+	__sys_preadv;
+	_profil;
+	__sys_profil;
+	_pselect;
+	__sys_pselect;
+	_ptrace;
+	__sys_ptrace;
+	_pwritev;
+	__sys_pwritev;
+	_quotactl;
+	__sys_quotactl;
+	_read;
+	__sys_read;
+	_readlink;
+	__sys_readlink;
+	_readv;
+	__sys_readv;
+	_reboot;
+	__sys_reboot;
+	_recvfrom;
+	__sys_recvfrom;
+	_recvmsg;
+	__sys_recvmsg;
+	_rename;
+	__sys_rename;
+	_revoke;
+	__sys_revoke;
+	_rfork;
+	__sys_rfork;
+	_rmdir;
+	__sys_rmdir;
+	_rtprio;
+	__sys_rtprio;
+	_rtprio_thread;
+	__sys_rtprio_thread;
+	_sched_get_priority_max;
+	__sys_sched_get_priority_max;
+	_sched_get_priority_min;
+	__sys_sched_get_priority_min;
+	_sched_getparam;
+	__sys_sched_getparam;
+	_sched_getscheduler;
+	__sys_sched_getscheduler;
+	_sched_rr_get_interval;
+	__sys_sched_rr_get_interval;
+	_sched_setparam;
+	__sys_sched_setparam;
+	_sched_setscheduler;
+	__sys_sched_setscheduler;
+	_sched_yield;
+	__sys_sched_yield;
+	_select;
+	__sys_select;
+	_semget;
+	__sys_semget;
+	_semop;
+	__sys_semop;
+	_semsys;
+	__sys_semsys;
+	_sendfile;
+	__sys_sendfile;
+	_sendmsg;
+	__sys_sendmsg;
+	_sendto;
+	__sys_sendto;
+	_setaudit;
+	__sys_setaudit;
+	_setaudit_addr;
+	__sys_setaudit_addr;
+	_setauid;
+	__sys_setauid;
+	_setcontext;
+	__sys_setcontext;
+	_setegid;
+	__sys_setegid;
+	_seteuid;
+	__sys_seteuid;
+	_setgid;
+	__sys_setgid;
+	_setgroups;
+	__sys_setgroups;
+	_setitimer;
+	__sys_setitimer;
+	_setlogin;
+	__sys_setlogin;
+	_setpgid;
+	__sys_setpgid;
+	_setpriority;
+	__sys_setpriority;
+	_setregid;
+	__sys_setregid;
+	_setresgid;
+	__sys_setresgid;
+	_setresuid;
+	__sys_setresuid;
+	_setreuid;
+	__sys_setreuid;
+	_setrlimit;
+	__sys_setrlimit;
+	_setsid;
+	__sys_setsid;
+	_setsockopt;
+	__sys_setsockopt;
+	_settimeofday;
+	__sys_settimeofday;
+	_setuid;
+	__sys_setuid;
+	_shm_open;
+	__sys_shm_open;
+	_shm_unlink;
+	__sys_shm_unlink;
+	_shmat;
+	__sys_shmat;
+	_shmctl;
+	__sys_shmctl;
+	_shmdt;
+	__sys_shmdt;
+	_shmget;
+	__sys_shmget;
+	_shmsys;
+	__sys_shmsys;
+	_shutdown;
+	__sys_shutdown;
+	_sigaction;
+	__sys_sigaction;
+	_sigaltstack;
+	__sys_sigaltstack;
+	_sigpending;
+	__sys_sigpending;
+	_sigprocmask;
+	__sys_sigprocmask;
+	_sigqueue;
+	__sys_sigqueue;
+	_sigreturn;
+	__sys_sigreturn;
+	_sigsuspend;
+	__sys_sigsuspend;
+	_sigtimedwait;
+	__sys_sigtimedwait;
+	_sigwait;
+	__sigwait;
+	__sys_sigwait;
+	_sigwaitinfo;
+	__sys_sigwaitinfo;
+	_socket;
+	__sys_socket;
+	_socketpair;
+	__sys_socketpair;
+	_stat;
+	__sys_stat;
+	_statfs;
+	__sys_statfs;
+	_swapcontext;
+	__sys_swapcontext;
+	_swapoff;
+	__sys_swapoff;
+	_swapon;
+	__sys_swapon;
+	_symlink;
+	__sys_symlink;
+	_sync;
+	__sys_sync;
+	_sysarch;
+	__sys_sysarch;
+	_syscall;
+	__sys_syscall;
+	_thr_create;
+	__sys_thr_create;
+	_thr_exit;
+	__sys_thr_exit;
+	_thr_kill;
+	__sys_thr_kill;
+	_thr_kill2;
+	__sys_thr_kill2;
+	_thr_new;
+	__sys_thr_new;
+	_thr_self;
+	__sys_thr_self;
+	_thr_set_name;
+	__sys_thr_set_name;
+	_thr_suspend;
+	__sys_thr_suspend;
+	_thr_wake;
+	__sys_thr_wake;
+	_ktimer_create;
+	__sys_ktimer_create;
+	_ktimer_delete;
+	__sys_ktimer_delete;
+	_ktimer_getoverrun;
+	__sys_ktimer_getoverrun;
+	_ktimer_gettime;
+	__sys_ktimer_gettime;
+	_ktimer_settime;
+	__sys_ktimer_settime;
+	_umask;
+	__sys_umask;
+	_undelete;
+	__sys_undelete;
+	_unlink;
+	__sys_unlink;
+	_unmount;
+	__sys_unmount;
+	_utimes;
+	__sys_utimes;
+	_utrace;
+	__sys_utrace;
+	_uuidgen;
+	__sys_uuidgen;
+	_vadvise;
+	__sys_vadvise;
+	_wait4;
+	__sys_wait4;
+	_write;
+	__sys_write;
+	_writev;
+	__sys_writev;
+	__error_unthreaded;
+	nlm_syscall;
+	gssd_syscall;
+};
diff --git a/lib/libc/sys/__error.c b/lib/libc/sys/__error.c
new file mode 100644
index 0000000..c3f59f8
--- /dev/null
+++ b/lib/libc/sys/__error.c
@@ -0,0 +1,45 @@
+/*
+ * Copyright (c) 1997 John Birrell <jb@cimlogic.com.au>.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the author nor the names of any co-contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+extern int errno;
+
+/*
+ * Declare a weak reference in case the application is not linked
+ * with libpthread.
+ */
+__weak_reference(__error_unthreaded, __error);
+
+int *
+__error_unthreaded(void)
+{
+	return(&errno);
+}
diff --git a/lib/libc/sys/_exit.2 b/lib/libc/sys/_exit.2
new file mode 100644
index 0000000..b35e7c4
--- /dev/null
+++ b/lib/libc/sys/_exit.2
@@ -0,0 +1,123 @@
+.\" Copyright (c) 1980, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"     @(#)_exit.2	8.1 (Berkeley) 6/4/93
+.\" $FreeBSD$
+.\"
+.Dd June 4, 1993
+.Dt EXIT 2
+.Os
+.Sh NAME
+.Nm _exit
+.Nd terminate the calling process
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In unistd.h
+.Ft void
+.Fn _exit "int status"
+.Sh DESCRIPTION
+The
+.Fn _exit
+system call
+terminates a process with the following consequences:
+.Bl -bullet
+.It
+All of the descriptors open in the calling process are closed.
+This may entail delays, for example, waiting for output to drain;
+a process in this state may not be killed, as it is already dying.
+.It
+If the parent process of the calling process has an outstanding
+.Xr wait 2
+call
+or catches the
+.Dv SIGCHLD
+signal,
+it is notified of the calling process's termination and
+the
+.Fa status
+is set as defined by
+.Xr wait 2 .
+.It
+The parent process-ID of all of the calling process's existing child
+processes are set to 1; the initialization process
+inherits each of these processes
+(see
+.Xr init 8
+and the
+.Sx DEFINITIONS
+section of
+.Xr intro 2 ) .
+.It
+If the termination of the process causes any process group
+to become orphaned (usually because the parents of all members
+of the group have now exited; see
+.Dq orphaned process group
+in
+.Xr intro 2 ) ,
+and if any member of the orphaned group is stopped,
+the
+.Dv SIGHUP
+signal and the
+.Dv SIGCONT
+signal are sent to all members of the newly-orphaned process group.
+.It
+If the process is a controlling process (see
+.Xr intro 2 ) ,
+the
+.Dv SIGHUP
+signal is sent to the foreground process group of the controlling terminal,
+and all current access to the controlling terminal is revoked.
+.El
+.Pp
+Most C programs call the library routine
+.Xr exit 3 ,
+which flushes buffers, closes streams, unlinks temporary files, etc.,
+before
+calling
+.Fn _exit .
+.Sh RETURN VALUES
+The
+.Fn _exit
+system call
+can never return.
+.Sh SEE ALSO
+.Xr fork 2 ,
+.Xr sigaction 2 ,
+.Xr wait 2 ,
+.Xr exit 3 ,
+.Xr init 8
+.Sh STANDARDS
+The
+.Fn _exit
+system call is expected to conform to
+.St -p1003.1-90 .
+.Sh HISTORY
+The
+.Fn _exit
+function appeared in
+.At v7 .
diff --git a/lib/libc/sys/abort2.2 b/lib/libc/sys/abort2.2
new file mode 100644
index 0000000..4698c72
--- /dev/null
+++ b/lib/libc/sys/abort2.2
@@ -0,0 +1,113 @@
+.\" Copyright (c) 2005 Wojciech A. Koszek <dunstan@FreeBSD.czest.pl>
+.\" All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd September 30, 2006
+.Dt ABORT2 2
+.Os
+.Sh NAME
+.Nm abort2
+.Nd "abort process with diagnostics"
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In stdlib.h
+.Ft void
+.Fn abort2 "const char *why" "int nargs" "void **args"
+.Sh DESCRIPTION
+The
+.Fn abort2
+system call causes the process to be killed and the specified diagnostic
+message (with arguments) to be delivered by the kernel to the
+.Xr syslogd 8
+daemon.
+.Pp
+The
+.Fa why
+argument points to a
+.Dv NUL- Ns
+terminated string specifying a reason of the program's termination
+(maximum 128 characters long).
+The
+.Fa args
+array contains pointers which will be logged numerically
+(with the kernel's
+.Ql %p
+.Xr printf 9
+format).
+The
+.Fa nargs
+argument specifies the number of pointers in
+.Fa args
+(maximum 16).
+.Pp
+The
+.Fn abort2
+system call
+is intended for use in situations where continuation of a process
+is impossible or for other definitive reasons is unwanted, and normal
+diagnostic channels cannot be trusted to deliver the message.
+.Sh RETURN VALUES
+The
+.Fn abort2
+function
+never returns.
+.Pp
+The process is killed with
+.Dv SIGABRT
+unless the arguments to
+.Fn abort2
+are invalid, in which case
+.Dv SIGKILL
+is used.
+.Sh EXAMPLES
+.Bd -literal -compact
+#include <stdlib.h>
+
+if (weight_kg > max_load) {
+	void *ptrs[3];
+
+	ptrs[0] = (void *)(intptr_t)weight_kg;
+	ptrs[1] = (void *)(intptr_t)max_load;
+	ptrs[2] = haystack;
+	abort2("Camel overloaded", 3, ptrs);
+}
+.Ed
+.Sh SEE ALSO
+.Xr abort 3 ,
+.Xr exit 3
+.Sh HISTORY
+The
+.Fn abort2
+system call first appeared in
+.Fx 7.0 .
+.Sh AUTHORS
+.An -nosplit
+The
+.Fn abort2
+system call was designed by
+.An "Poul-Henning Kamp" Aq phk@FreeBSD.org .
+It was implemented by
+.An "Wojciech A. Koszek" Aq dunstan@freebsd.czest.pl .
diff --git a/lib/libc/sys/accept.2 b/lib/libc/sys/accept.2
new file mode 100644
index 0000000..df6c0b1
--- /dev/null
+++ b/lib/libc/sys/accept.2
@@ -0,0 +1,186 @@
+.\" Copyright (c) 1983, 1990, 1991, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"     @(#)accept.2	8.2 (Berkeley) 12/11/93
+.\" $FreeBSD$
+.\"
+.Dd December 11, 1993
+.Dt ACCEPT 2
+.Os
+.Sh NAME
+.Nm accept
+.Nd accept a connection on a socket
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In sys/types.h
+.In sys/socket.h
+.Ft int
+.Fn accept "int s" "struct sockaddr * restrict addr" "socklen_t * restrict addrlen"
+.Sh DESCRIPTION
+The argument
+.Fa s
+is a socket that has been created with
+.Xr socket 2 ,
+bound to an address with
+.Xr bind 2 ,
+and is listening for connections after a
+.Xr listen 2 .
+The
+.Fn accept
+system call extracts the first connection request on the
+queue of pending connections, creates a new socket,
+and allocates a new file descriptor for the socket which
+inherits the state of the
+.Dv O_NONBLOCK
+property from the original socket
+.Fa s .
+.Pp
+If no pending connections are
+present on the queue, and the original socket
+is not marked as non-blocking,
+.Fn accept
+blocks the caller until a connection is present.
+If the original socket
+is marked non-blocking and no pending
+connections are present on the queue,
+.Fn accept
+returns an error as described below.
+The accepted socket
+may not be used
+to accept more connections.
+The original socket
+.Fa s
+remains open.
+.Pp
+The argument
+.Fa addr
+is a result argument that is filled-in with
+the address of the connecting entity,
+as known to the communications layer.
+The exact format of the
+.Fa addr
+argument is determined by the domain in which the communication
+is occurring.
+A null pointer may be specified for
+.Fa addr
+if the address information is not desired;
+in this case,
+.Fa addrlen
+is not used and should also be null.
+Otherwise, the
+.Fa addrlen
+argument
+is a value-result argument; it should initially contain the
+amount of space pointed to by
+.Fa addr ;
+on return it will contain the actual length (in bytes) of the
+address returned.
+This call
+is used with connection-based socket types, currently with
+.Dv SOCK_STREAM .
+.Pp
+It is possible to
+.Xr select 2
+a socket for the purposes of doing an
+.Fn accept
+by selecting it for read.
+.Pp
+For certain protocols which require an explicit confirmation,
+such as
+.Tn ISO
+or
+.Tn DATAKIT ,
+.Fn accept
+can be thought of
+as merely dequeueing the next connection
+request and not implying confirmation.
+Confirmation can be implied by a normal read or write on the new
+file descriptor, and rejection can be implied by closing the
+new socket.
+.Pp
+For some applications, performance may be enhanced by using an
+.Xr accept_filter 9
+to pre-process incoming connections.
+.Pp
+Portable programs should not rely on the
+.Dv O_NONBLOCK
+property being inherited.
+.Sh RETURN VALUES
+The call returns \-1 on error.
+If it succeeds, it returns a non-negative
+integer that is a descriptor for the accepted socket.
+.Sh ERRORS
+The
+.Fn accept
+system call will fail if:
+.Bl -tag -width Er
+.It Bq Er EBADF
+The descriptor is invalid.
+.It Bq Er EINTR
+The
+.Fn accept
+operation was interrupted.
+.It Bq Er EMFILE
+The per-process descriptor table is full.
+.It Bq Er ENFILE
+The system file table is full.
+.It Bq Er ENOTSOCK
+The descriptor references a file, not a socket.
+.It Bq Er EINVAL
+.Xr listen 2
+has not been called on the socket descriptor.
+.It Bq Er EINVAL
+The
+.Fa addrlen
+argument is negative.
+.It Bq Er EFAULT
+The
+.Fa addr
+argument is not in a writable part of the
+user address space.
+.It Bq Er EWOULDBLOCK
+The socket is marked non-blocking and no connections
+are present to be accepted.
+.It Bq Er ECONNABORTED
+A connection arrived, but it was closed while waiting
+on the listen queue.
+.El
+.Sh SEE ALSO
+.Xr bind 2 ,
+.Xr connect 2 ,
+.Xr getpeername 2 ,
+.Xr getsockname 2 ,
+.Xr listen 2 ,
+.Xr select 2 ,
+.Xr socket 2 ,
+.Xr accept_filter 9
+.Sh HISTORY
+The
+.Fn accept
+system call appeared in
+.Bx 4.2 .
diff --git a/lib/libc/sys/access.2 b/lib/libc/sys/access.2
new file mode 100644
index 0000000..65b8fb6
--- /dev/null
+++ b/lib/libc/sys/access.2
@@ -0,0 +1,235 @@
+.\" Copyright (c) 1980, 1991, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"     @(#)access.2	8.2 (Berkeley) 4/1/94
+.\" $FreeBSD$
+.\"
+.Dd April 10, 2008
+.Dt ACCESS 2
+.Os
+.Sh NAME
+.Nm access ,
+.Nm eaccess ,
+.Nm faccessat
+.Nd check accessibility of a file
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In unistd.h
+.Ft int
+.Fn access "const char *path" "int mode"
+.Ft int
+.Fn eaccess "const char *path" "int mode"
+.Ft int
+.Fn faccessat "int fd" "const char *path" "int mode" "int flag"
+.Sh DESCRIPTION
+The
+.Fn access
+and
+.Fn eaccess
+system calls check the accessibility of the
+file named by
+the
+.Fa path
+argument
+for the access permissions indicated by
+the
+.Fa mode
+argument.
+The value of
+.Fa mode
+is either the bitwise-inclusive OR of the access permissions to be
+checked
+.Dv ( R_OK
+for read permission,
+.Dv W_OK
+for write permission, and
+.Dv X_OK
+for execute/search permission),
+or the existence test
+.Pq Dv F_OK .
+.Pp
+For additional information, see the
+.Sx "File Access Permission"
+section of
+.Xr intro 2 .
+.Pp
+The
+.Fn eaccess
+system call uses
+the effective user ID and the group access list
+to authorize the request;
+the
+.Fn access
+system call uses
+the real user ID in place of the effective user ID,
+the real group ID in place of the effective group ID,
+and the rest of the group access list.
+.Pp
+The
+.Fn faccessat
+system call is equivalent to
+.Fn access
+except in the case where
+.Fa path
+specifies a relative path.
+In this case the file whose accessibility is to be determined is
+located relative to the directory associated with the file descriptor
+.Fa fd
+instead of the current working directory.
+If
+.Fn faccessat
+is passed the special value
+.Dv AT_FDCWD
+in the
+.Fa fd
+parameter, the current working directory is used and the behavior is
+identical to a call to
+.Fn access .
+Values for
+.Fa flag
+are constructed by a bitwise-inclusive OR of flags from the following
+list, defined in
+.In fcntl.h :
+.Bl -tag -width indent
+.It Dv AT_EACCESS
+The checks for accessibility are performed using the effective user and group
+IDs instead of the real user and group ID as required in a call to
+.Fn access .
+.El
+.Pp
+Even if a process's real or effective user has appropriate privileges
+and indicates success for
+.Dv X_OK ,
+the file may not actually have execute permission bits set.
+Likewise for
+.Dv R_OK
+and
+.Dv W_OK .
+.Sh RETURN VALUES
+.Rv -std
+.Sh ERRORS
+Access to the file is denied if:
+.Bl -tag -width Er
+.It Bq Er ENOTDIR
+A component of the path prefix is not a directory.
+.It Bq Er ENAMETOOLONG
+A component of a pathname exceeded 255 characters,
+or an entire path name exceeded 1023 characters.
+.It Bq Er ENOENT
+The named file does not exist.
+.It Bq Er ELOOP
+Too many symbolic links were encountered in translating the pathname.
+.It Bq Er EROFS
+Write access is requested for a file on a read-only file system.
+.It Bq Er ETXTBSY
+Write access is requested for a pure procedure (shared text)
+file presently being executed.
+.It Bq Er EACCES
+Permission bits of the file mode do not permit the requested
+access, or search permission is denied on a component of the
+path prefix.
+.It Bq Er EFAULT
+The
+.Fa path
+argument
+points outside the process's allocated address space.
+.It Bq Er EIO
+An I/O error occurred while reading from or writing to the file system.
+.El
+.Pp
+Also, the
+.Fn faccessat
+system call may fail if:
+.Bl -tag -width Er
+.It Bq Er EBADF
+The
+.Fa path
+argument does not specify an absolute path and the
+.Fa fd
+argument is
+neither
+.Dv AT_FDCWD
+nor a valid file descriptor.
+.It Bq Er EINVAL
+The value of the
+.Fa flag
+argument is not valid.
+.It Bq Er ENOTDIR
+The
+.Fa path
+argument is not an absolute path and
+.Fa fd
+is neither
+.Dv AT_FDCWD
+nor a file descriptor associated with a directory.
+.El
+.Sh SEE ALSO
+.Xr chmod 2 ,
+.Xr intro 2 ,
+.Xr stat 2
+.Sh STANDARDS
+The
+.Fn access
+system call is expected to conform to
+.St -p1003.1-90 .
+The
+.Fn faccessat
+system call follows The Open Group Extended API Set 2 specification.
+.Sh HISTORY
+The
+.Fn access
+function appeared in
+.At v7 .
+The
+.Fn faccessat
+system call appeared in
+.Fx 8.0 .
+.Sh SECURITY CONSIDERATIONS
+The
+.Fn access
+system call
+is a potential security hole due to race conditions and
+should never be used.
+Set-user-ID and set-group-ID applications should restore the
+effective user or group ID,
+and perform actions directly rather than use
+.Fn access
+to simulate access checks for the real user or group ID.
+The
+.Fn eaccess
+system call
+likewise may be subject to races if used inappropriately.
+.Pp
+.Fn access
+remains useful for providing clues to users as to whether operations
+make sense for particular filesystem objects (e.g. 'delete' menu
+item only highlighted in a writable folder ... avoiding interpretation
+of the st_mode bits that the application might not understand --
+e.g. in the case of AFS).
+It also allows a cheaper file existence test than
+.Xr stat 2 .
diff --git a/lib/libc/sys/acct.2 b/lib/libc/sys/acct.2
new file mode 100644
index 0000000..caf1aea
--- /dev/null
+++ b/lib/libc/sys/acct.2
@@ -0,0 +1,131 @@
+.\" Copyright (c) 1980, 1991, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"     @(#)acct.2	8.1 (Berkeley) 6/4/93
+.\" $FreeBSD$
+.\"
+.Dd April 17, 2004
+.Dt ACCT 2
+.Os
+.Sh NAME
+.Nm acct
+.Nd enable or disable process accounting
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In unistd.h
+.Ft int
+.Fn acct "const char *file"
+.Sh DESCRIPTION
+The
+.Fn acct
+system call enables or disables the collection of system accounting
+records.
+If the argument
+.Fa file
+is a null pointer, accounting is disabled.
+If
+.Fa file
+is an
+.Em existing
+pathname (null-terminated), record collection is enabled and for
+every process initiated which terminates under normal
+conditions an accounting record is appended to
+.Fa file .
+Abnormal conditions of termination are reboots
+or other fatal system problems.
+Records for processes which never terminate cannot be
+produced by
+.Fn acct .
+.Pp
+For more information on the record structure used by
+.Fn acct ,
+see
+.In sys/acct.h
+and
+.Xr acct 5 .
+.Pp
+This call is permitted only to the super-user.
+.Sh NOTES
+Accounting is automatically disabled when the file system the
+accounting file resides on runs out of space; it is enabled when
+space once again becomes available.
+The values controlling this behaviour can be modified using the following
+.Xr sysctl 8
+variables:
+.Bl -tag -width ".Va kern.acct_chkfreq"
+.It Va kern.acct_chkfreq
+Specifies the frequency (in seconds) with which free disk
+space should be checked.
+.It Va kern.acct_resume
+The percentage of free disk space above which process
+accounting will resume.
+.It Va kern.acct_suspend
+The percentage of free disk space below which process
+accounting will suspend.
+.El
+.Sh RETURN VALUES
+On error -1 is returned.
+The file must exist and the call may be exercised only by the super-user.
+.Sh ERRORS
+The
+.Fn acct
+system call will fail if one of the following is true:
+.Bl -tag -width Er
+.It Bq Er EPERM
+The caller is not the super-user.
+.It Bq Er ENOTDIR
+A component of the path prefix is not a directory.
+.It Bq Er ENAMETOOLONG
+A component of a pathname exceeded 255 characters,
+or an entire path name exceeded 1023 characters.
+.It Bq Er ENOENT
+The named file does not exist.
+.It Bq Er EACCES
+Search permission is denied for a component of the path prefix,
+or the path name is not a regular file.
+.It Bq Er ELOOP
+Too many symbolic links were encountered in translating the pathname.
+.It Bq Er EROFS
+The named file resides on a read-only file system.
+.It Bq Er EFAULT
+The
+.Fa file
+argument
+points outside the process's allocated address space.
+.It Bq Er EIO
+An I/O error occurred while reading from or writing to the file system.
+.El
+.Sh SEE ALSO
+.Xr acct 5 ,
+.Xr accton 8 ,
+.Xr sa 8
+.Sh HISTORY
+The
+.Fn acct
+function appeared in
+.At v7 .
diff --git a/lib/libc/sys/adjtime.2 b/lib/libc/sys/adjtime.2
new file mode 100644
index 0000000..95cfca0
--- /dev/null
+++ b/lib/libc/sys/adjtime.2
@@ -0,0 +1,111 @@
+.\" Copyright (c) 1980, 1991, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"     @(#)adjtime.2	8.1 (Berkeley) 6/4/93
+.\" $FreeBSD$
+.\"
+.Dd June 4, 1993
+.Dt ADJTIME 2
+.Os
+.Sh NAME
+.Nm adjtime
+.Nd "correct the time to allow synchronization of the system clock"
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In sys/time.h
+.Ft int
+.Fn adjtime "const struct timeval *delta" "struct timeval *olddelta"
+.Sh DESCRIPTION
+The
+.Fn adjtime
+system call
+makes small adjustments to the system time, as returned by
+.Xr gettimeofday 2 ,
+advancing or retarding it
+by the time specified by the timeval
+.Fa delta .
+If
+.Fa delta
+is negative, the clock is
+slowed down by incrementing it more slowly than normal until
+the correction is complete.
+If
+.Fa delta
+is positive, a larger increment than normal
+is used.
+The skew used to perform the correction is generally a fraction of one percent.
+Thus, the time is always
+a monotonically increasing function.
+A time correction from an earlier call to
+.Fn adjtime
+may not be finished when
+.Fn adjtime
+is called again.
+If
+.Fa olddelta
+is not a null pointer,
+the structure pointed to will contain, upon return, the
+number of microseconds still to be corrected
+from the earlier call.
+.Pp
+This call may be used by time servers that synchronize the clocks
+of computers in a local area network.
+Such time servers would slow down the clocks of some machines
+and speed up the clocks of others to bring them to the average network time.
+.Pp
+The
+.Fn adjtime
+system call
+is restricted to the super-user.
+.Sh RETURN VALUES
+.Rv -std adjtime
+.Sh ERRORS
+The
+.Fn adjtime
+system call will fail if:
+.Bl -tag -width Er
+.It Bq Er EFAULT
+An argument points outside the process's allocated address space.
+.It Bq Er EPERM
+The process's effective user ID is not that of the super-user.
+.El
+.Sh SEE ALSO
+.Xr date 1 ,
+.Xr gettimeofday 2 ,
+.Xr timed 8 ,
+.Xr timedc 8
+.Rs
+.%T "TSP: The Time Synchronization Protocol for UNIX 4.3BSD"
+.%A R. Gusella
+.%A S. Zatti
+.Re
+.Sh HISTORY
+The
+.Fn adjtime
+system call appeared in
+.Bx 4.3 .
diff --git a/lib/libc/sys/aio_cancel.2 b/lib/libc/sys/aio_cancel.2
new file mode 100644
index 0000000..54e7b39
--- /dev/null
+++ b/lib/libc/sys/aio_cancel.2
@@ -0,0 +1,117 @@
+.\" Copyright (c) 1999 Softweyr LLC.
+.\" All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY Softweyr LLC AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL Softweyr LLC OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd January 19, 2000
+.Dt AIO_CANCEL 2
+.Os
+.Sh NAME
+.Nm aio_cancel
+.Nd cancel an outstanding asynchronous I/O operation (REALTIME)
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In aio.h
+.Ft int
+.Fn aio_cancel "int fildes" "struct aiocb *iocb"
+.Sh DESCRIPTION
+The
+.Fn aio_cancel
+system call cancels the outstanding asynchronous
+I/O request for the file descriptor specified in
+.Fa fildes .
+If
+.Fa iocb
+is specified, only that specific asynchronous I/O request is cancelled.
+.Pp
+Normal asynchronous notification occurs for cancelled requests.
+Requests complete with an error result of
+.Er ECANCELED .
+.Sh RESTRICTIONS
+The
+.Fn aio_cancel
+system call does not cancel asynchronous I/O requests for raw disk devices.
+The
+.Fn aio_cancel
+system call will always return
+.Dv AIO_NOTCANCELED
+for file descriptors associated with raw disk devices.
+.Sh RETURN VALUES
+The
+.Fn aio_cancel
+system call returns -1 to indicate an error, or one of the following:
+.Bl -tag -width Dv
+.It Bq Dv AIO_CANCELED
+All outstanding requests meeting the criteria specified were cancelled.
+.It Bq Dv AIO_NOTCANCELED
+Some requests were not cancelled, status for the requests should be
+checked with
+.Xr aio_error 2 .
+.It Bq Dv AIO_ALLDONE
+All of the requests meeting the criteria have finished.
+.El
+.Sh ERRORS
+An error return from
+.Fn aio_cancel
+indicates:
+.Bl -tag -width Er
+.It Bq Er EBADF
+The
+.Fa fildes
+argument
+is an invalid file descriptor.
+.El
+.Sh SEE ALSO
+.Xr aio_error 2 ,
+.Xr aio_read 2 ,
+.Xr aio_return 2 ,
+.Xr aio_suspend 2 ,
+.Xr aio_write 2 ,
+.Xr aio 4
+.Sh STANDARDS
+The
+.Fn aio_cancel
+system call is expected to conform to the
+.St -p1003.1
+standard.
+.Sh HISTORY
+The
+.Fn aio_cancel
+system call first appeared in
+.Fx 3.0 .
+The first functional implementation of
+.Fn aio_cancel
+appeared in
+.Fx 4.0 .
+.Sh AUTHORS
+.An -nosplit
+This
+manual page was originally written by
+.An Wes Peters Aq wes@softweyr.com .
+.An Christopher M Sedore Aq cmsedore@maxwell.syr.edu
+updated it when
+.Fn aio_cancel
+was implemented for
+.Fx 4.0 .
diff --git a/lib/libc/sys/aio_error.2 b/lib/libc/sys/aio_error.2
new file mode 100644
index 0000000..f63a2dd
--- /dev/null
+++ b/lib/libc/sys/aio_error.2
@@ -0,0 +1,101 @@
+.\" Copyright (c) 1999 Softweyr LLC.
+.\" All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY Softweyr LLC AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL Softweyr LLC OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd June 2, 1999
+.Dt AIO_ERROR 2
+.Os
+.Sh NAME
+.Nm aio_error
+.Nd retrieve error status of asynchronous I/O operation (REALTIME)
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In aio.h
+.Ft int
+.Fn aio_error "const struct aiocb *iocb"
+.Sh DESCRIPTION
+The
+.Fn aio_error
+system call returns the error status of the asynchronous I/O request
+associated with the structure pointed to by
+.Fa iocb .
+.Sh RETURN VALUES
+If the asynchronous I/O request has completed successfully,
+.Fn aio_error
+returns 0.
+If the request has not yet completed,
+.Er EINPROGRESS
+is returned.
+If the request has completed unsuccessfully the error
+status is returned as described in
+.Xr read 2 ,
+.Xr write 2 ,
+or
+.Xr fsync 2 .
+On failure,
+.Fn aio_error
+returns
+.Dv -1
+and sets
+.Dv errno
+to indicate the error condition.
+.Sh ERRORS
+The
+.Fn aio_error
+system call will fail if:
+.Bl -tag -width Er
+.It Bq Er EINVAL
+The
+.Fa iocb
+argument
+does not reference an outstanding asynchronous I/O request.
+.El
+.Sh SEE ALSO
+.Xr aio_cancel 2 ,
+.Xr aio_read 2 ,
+.Xr aio_return 2 ,
+.Xr aio_suspend 2 ,
+.Xr aio_write 2 ,
+.Xr fsync 2 ,
+.Xr read 2 ,
+.Xr write 2 ,
+.Xr aio 4
+.Sh STANDARDS
+The
+.Fn aio_error
+system call
+is expected to conform to the
+.St -p1003.1
+standard.
+.Sh HISTORY
+The
+.Fn aio_error
+system call first appeared in
+.Fx 3.0 .
+.Sh AUTHORS
+This
+manual page was written by
+.An Wes Peters Aq wes@softweyr.com .
diff --git a/lib/libc/sys/aio_read.2 b/lib/libc/sys/aio_read.2
new file mode 100644
index 0000000..ddf4f76
--- /dev/null
+++ b/lib/libc/sys/aio_read.2
@@ -0,0 +1,214 @@
+.\" Copyright (c) 1998 Terry Lambert
+.\" All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd November 17, 1998
+.Dt AIO_READ 2
+.Os
+.Sh NAME
+.Nm aio_read
+.Nd asynchronous read from a file (REALTIME)
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In aio.h
+.Ft int
+.Fn aio_read "struct aiocb *iocb"
+.Sh DESCRIPTION
+The
+.Fn aio_read
+system call allows the calling process to read
+.Fa iocb->aio_nbytes
+from the descriptor
+.Fa iocb->aio_fildes
+beginning at the offset
+.Fa iocb->aio_offset
+into the buffer pointed to by
+.Fa iocb->aio_buf .
+The call returns immediately after the read request has
+been enqueued to the descriptor; the read may or may not have
+completed at the time the call returns.
+.Pp
+If _POSIX_PRIORITIZED_IO is defined, and the descriptor supports it,
+then the enqueued operation is submitted at a priority equal to that
+of the calling process minus
+.Fa iocb->aio_reqprio .
+.Pp
+The
+.Fa iocb->aio_lio_opcode
+argument
+is ignored by the
+.Fn aio_read
+system call.
+.Pp
+The
+.Fa iocb
+pointer may be subsequently used as an argument to
+.Fn aio_return
+and
+.Fn aio_error
+in order to determine return or error status for the enqueued operation
+while it is in progress.
+.Pp
+If the request could not be enqueued (generally due to invalid arguments),
+then the call returns without having enqueued the request.
+.Pp
+If the request is successfully enqueued, the value of
+.Fa iocb->aio_offset
+can be modified during the request as context, so this value must
+not be referenced after the request is enqueued.
+.Sh RESTRICTIONS
+The Asynchronous I/O Control Block structure pointed to by
+.Fa iocb
+and the buffer that the
+.Fa iocb->aio_buf
+member of that structure references must remain valid until the
+operation has completed.
+For this reason, use of auto (stack) variables
+for these objects is discouraged.
+.Pp
+The asynchronous I/O control buffer
+.Fa iocb
+should be zeroed before the
+.Fn aio_read
+call to avoid passing bogus context information to the kernel.
+.Pp
+Modifications of the Asynchronous I/O Control Block structure or the
+buffer contents after the request has been enqueued, but before the
+request has completed, are not allowed.
+.Pp
+If the file offset in
+.Fa iocb->aio_offset
+is past the offset maximum for
+.Fa iocb->aio_fildes ,
+no I/O will occur.
+.Sh RETURN VALUES
+.Rv -std aio_read
+.Sh DIAGNOSTICS
+None.
+.Sh ERRORS
+The
+.Fn aio_read
+system call will fail if:
+.Bl -tag -width Er
+.It Bq Er EAGAIN
+The request was not queued because of system resource limitations.
+.It Bq Er ENOSYS
+The
+.Fn aio_read
+system call is not supported.
+.El
+.Pp
+The following conditions may be synchronously detected when the
+.Fn aio_read
+system call is made, or asynchronously, at any time thereafter.
+If they
+are detected at call time,
+.Fn aio_read
+returns -1 and sets
+.Va errno
+appropriately; otherwise the
+.Fn aio_return
+system call must be called, and will return -1, and
+.Fn aio_error
+must be called to determine the actual value that would have been
+returned in
+.Va errno .
+.Bl -tag -width Er
+.It Bq Er EBADF
+The
+.Fa iocb->aio_fildes
+argument
+is invalid.
+.It Bq Er EINVAL
+The offset
+.Fa iocb->aio_offset
+is not valid, the priority specified by
+.Fa iocb->aio_reqprio
+is not a valid priority, or the number of bytes specified by
+.Fa iocb->aio_nbytes
+is not valid.
+.It Bq Er EOVERFLOW
+The file is a regular file,
+.Fa iocb->aio_nbytes
+is greater than zero, the starting offset in
+.Fa iocb->aio_offset
+is before the end of the file, but is at or beyond the
+.Fa iocb->aio_fildes
+offset maximum.
+.El
+.Pp
+If the request is successfully enqueued, but subsequently cancelled
+or an error occurs, the value returned by the
+.Fn aio_return
+system call is per the
+.Xr read 2
+system call, and the value returned by the
+.Fn aio_error
+system call is either one of the error returns from the
+.Xr read 2
+system call, or one of:
+.Bl -tag -width Er
+.It Bq Er EBADF
+The
+.Fa iocb->aio_fildes
+argument
+is invalid for reading.
+.It Bq Er ECANCELED
+The request was explicitly cancelled via a call to
+.Fn aio_cancel .
+.It Bq Er EINVAL
+The offset
+.Fa iocb->aio_offset
+would be invalid.
+.El
+.Sh SEE ALSO
+.Xr aio_cancel 2 ,
+.Xr aio_error 2 ,
+.Xr aio_return 2 ,
+.Xr aio_suspend 2 ,
+.Xr aio_waitcomplete 2 ,
+.Xr aio_write 2 ,
+.Xr siginfo 3 ,
+.Xr aio 4
+.Sh STANDARDS
+The
+.Fn aio_read
+system call is expected to conform to the
+.St -p1003.1
+standard.
+.Sh HISTORY
+The
+.Fn aio_read
+system call first appeared in
+.Fx 3.0 .
+.Sh AUTHORS
+This
+manual page was written by
+.An Terry Lambert Aq terry@whistle.com .
+.Sh BUGS
+Invalid information in
+.Fa iocb->_aiocb_private
+may confuse the kernel.
diff --git a/lib/libc/sys/aio_return.2 b/lib/libc/sys/aio_return.2
new file mode 100644
index 0000000..2034f9d
--- /dev/null
+++ b/lib/libc/sys/aio_return.2
@@ -0,0 +1,102 @@
+.\" Copyright (c) 1999 Softweyr LLC.
+.\" All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY Softweyr LLC AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL Softweyr LLC OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd October 7, 2006
+.Dt AIO_RETURN 2
+.Os
+.Sh NAME
+.Nm aio_return
+.Nd retrieve return status of asynchronous I/O operation (REALTIME)
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In aio.h
+.Ft int
+.Fn aio_return "struct aiocb *iocb"
+.Sh DESCRIPTION
+The
+.Fn aio_return
+system call returns the final status of the asynchronous I/O request
+associated with the structure pointed to by
+.Fa iocb .
+.Pp
+The
+.Fn aio_return
+system call
+should only be called once, to obtain the final status of an asynchronous
+I/O operation once it has completed
+.Xr ( aio_error 2
+returns something other than
+.Er EINPROGRESS ) .
+.Sh RETURN VALUES
+If the asynchronous I/O request has completed, the status is returned
+as described in
+.Xr read 2 ,
+.Xr write 2 ,
+or
+.Xr fsync 2 .
+Otherwise,
+.Fn aio_return
+returns \-1 and sets
+.Va errno
+to indicate the error condition.
+.Sh ERRORS
+The
+.Fn aio_return
+system call will fail if:
+.Bl -tag -width Er
+.It Bq Er EINVAL
+The
+.Fa iocb
+argument
+does not reference a completed asynchronous I/O request.
+.El
+.Sh SEE ALSO
+.Xr aio_cancel 2 ,
+.Xr aio_error 2 ,
+.Xr aio_suspend 2 ,
+.Xr aio_waitcomplete 2 ,
+.Xr aio_write 2 ,
+.Xr fsync 2 ,
+.Xr read 2 ,
+.Xr write 2 ,
+.Xr aio 4
+.Sh STANDARDS
+The
+.Fn aio_return
+system call
+is expected to conform to the
+.St -p1003.1
+standard.
+.Sh HISTORY
+The
+.Fn aio_return
+system call first appeared in
+.Fx 3.0 .
+.Sh AUTHORS
+This
+manual page was written by
+.An Wes Peters Aq wes@softweyr.com .
diff --git a/lib/libc/sys/aio_suspend.2 b/lib/libc/sys/aio_suspend.2
new file mode 100644
index 0000000..5859d15
--- /dev/null
+++ b/lib/libc/sys/aio_suspend.2
@@ -0,0 +1,117 @@
+.\" Copyright (c) 1999 Softweyr LLC.
+.\" All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY Softweyr LLC AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL Softweyr LLC OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd June 2, 1999
+.Dt AIO_SUSPEND 2
+.Os
+.Sh NAME
+.Nm aio_suspend
+.Nd suspend until asynchronous I/O operations or timeout complete (REALTIME)
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In aio.h
+.Ft int
+.Fn aio_suspend "const struct aiocb *const iocbs[]" "int niocb" "const struct timespec *timeout"
+.Sh DESCRIPTION
+The
+.Fn aio_suspend
+system call suspends the calling process until at least one of the
+specified asynchronous I/O requests have completed, a signal is
+delivered, or the
+.Fa timeout
+has passed.
+.Pp
+The
+.Fa iocbs
+argument
+is an array of
+.Fa niocb
+pointers to asynchronous I/O requests.
+Array members containing
+null pointers will be silently ignored.
+.Pp
+If
+.Fa timeout
+is not a null pointer, it specifies a maximum interval to suspend.
+If
+.Fa timeout
+is a null pointer, the suspend blocks indefinitely.
+To effect a
+poll, the
+.Fa timeout
+should point to a zero-value timespec structure.
+.Sh RETURN VALUES
+If one or more of the specified asynchronous I/O requests have
+completed,
+.Fn aio_suspend
+returns 0.
+Otherwise it returns -1 and sets
+.Va errno
+to indicate the error, as enumerated below.
+.Sh ERRORS
+The
+.Fn aio_suspend
+system call will fail if:
+.Bl -tag -width Er
+.It Bq Er EAGAIN
+the
+.Fa timeout
+expired before any I/O requests completed.
+.It Bq Er EINVAL
+The
+.Fa iocbs
+argument
+contains more than
+.Dv AIO_LISTIO_MAX
+asynchronous I/O requests, or at least one of the requests is not
+valid.
+.It Bq Er EINTR
+the suspend was interrupted by a signal.
+.El
+.Sh SEE ALSO
+.Xr aio_cancel 2 ,
+.Xr aio_error 2 ,
+.Xr aio_return 2 ,
+.Xr aio_waitcomplete 2 ,
+.Xr aio_write 2 ,
+.Xr aio 4
+.Sh STANDARDS
+The
+.Fn aio_suspend
+system call
+is expected to conform to the
+.St -p1003.1
+standard.
+.Sh HISTORY
+The
+.Fn aio_suspend
+system call first appeared in
+.Fx 3.0 .
+.Sh AUTHORS
+This
+manual page was written by
+.An Wes Peters Aq wes@softweyr.com .
diff --git a/lib/libc/sys/aio_waitcomplete.2 b/lib/libc/sys/aio_waitcomplete.2
new file mode 100644
index 0000000..5145f78
--- /dev/null
+++ b/lib/libc/sys/aio_waitcomplete.2
@@ -0,0 +1,137 @@
+.\" Copyright (c) 1999 Christopher M Sedore.
+.\" All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd January 19, 2000
+.Dt AIO_WAITCOMPLETE 2
+.Os
+.Sh NAME
+.Nm aio_waitcomplete
+.Nd wait for the next completion of an aio request
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In aio.h
+.Ft int
+.Fn aio_waitcomplete "struct aiocb **iocbp" "struct timespec *timeout"
+.Sh DESCRIPTION
+The
+.Fn aio_waitcomplete
+system call waits for completion of an asynchronous I/O request.
+Upon completion,
+.Fn aio_waitcomplete
+returns the result of the function and sets
+.Fa iocbp
+to point to the structure associated with the original request.
+If an asynchronous I/O request is completed before
+.Fn aio_waitcomplete
+is called, it returns immediately with the completed request.
+.Pp
+If
+.Fa timeout
+is a non-NULL pointer, it specifies a maximum interval to wait for a
+asynchronous I/O request to complete.
+If
+.Fa timeout
+is a NULL pointer,
+.Fn aio_waitcomplete
+waits indefinitely.
+To effect a poll, the
+.Fa timeout
+argument should be non-NULL, pointing to a zero-valued timeval structure.
+.Pp
+The
+.Fn aio_waitcomplete
+system call also serves the function of
+.Fn aio_return ,
+thus
+.Fn aio_return
+should not be called for the control block returned in
+.Fa iocbp .
+.Sh RETURN VALUES
+If an asynchronous I/O request has completed,
+.Fa iocbp
+is set to point to the control block passed with the original request,
+and the status is returned as described in
+.Xr read 2 ,
+.Xr write 2 ,
+or
+.Xr fsync 2 .
+On failure,
+.Fn aio_waitcomplete
+returns
+.Dv -1 ,
+sets iocbp to
+.Dv NULL
+and sets
+.Va errno
+to indicate the error condition.
+.Sh ERRORS
+The
+.Fn aio_waitcomplete
+system call fails if:
+.Bl -tag -width Er
+.It Bq Er EINVAL
+The specified time limit is invalid.
+.It Bq Er EAGAIN
+The process has not yet called
+.Fn aio_read
+or
+.Fn aio_write .
+.It Bq Er EINTR
+A signal was delivered before the timeout expired and before any
+asynchronous I/O requests completed.
+.It Bq Er EWOULDBLOCK
+.It Bq Er EINPROGRESS
+The specified time limit expired before any asynchronous I/O requests
+completed.
+.El
+.Sh SEE ALSO
+.Xr aio_cancel 2 ,
+.Xr aio_error 2 ,
+.Xr aio_read 2 ,
+.Xr aio_return 2 ,
+.Xr aio_suspend 2 ,
+.Xr aio_write 2 ,
+.Xr fsync 2 ,
+.Xr read 2 ,
+.Xr write 2 ,
+.Xr aio 4
+.Sh STANDARDS
+The
+.Fn aio_waitcomplete
+system call is a
+.Fx Ns -specific
+extension.
+.Sh HISTORY
+The
+.Fn aio_waitcomplete
+system call first appeared in
+.Fx 4.0 .
+.Sh AUTHORS
+The
+.Fn aio_waitcomplete
+system call and this manual page were written by
+.An Christopher M Sedore Aq cmsedore@maxwell.syr.edu .
diff --git a/lib/libc/sys/aio_write.2 b/lib/libc/sys/aio_write.2
new file mode 100644
index 0000000..291fd71
--- /dev/null
+++ b/lib/libc/sys/aio_write.2
@@ -0,0 +1,209 @@
+.\" Copyright (c) 1999 Softweyr LLC.
+.\" All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY Softweyr LLC AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL Softweyr LLC OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd June 2, 1999
+.Dt AIO_WRITE 2
+.Os
+.Sh NAME
+.Nm aio_write
+.Nd asynchronous write to a file (REALTIME)
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In aio.h
+.Ft int
+.Fn aio_write "struct aiocb *iocb"
+.Sh DESCRIPTION
+The
+.Fn aio_write
+system call allows the calling process to write
+.Fa iocb->aio_nbytes
+from the buffer pointed to by
+.Fa iocb->aio_buf
+to the descriptor
+.Fa iocb->aio_fildes .
+The call returns immediately after the write request has been enqueued
+to the descriptor; the write may or may not have completed at the time
+the call returns.
+If the request could not be enqueued, generally due
+to invalid arguments, the call returns without having enqueued the
+request.
+.Pp
+If
+.Dv O_APPEND
+is set for
+.Fa iocb->aio_fildes ,
+.Fn aio_write
+operations append to the file in the same order as the calls were
+made.
+If
+.Dv O_APPEND
+is not set for the file descriptor, the write operation will occur at
+the absolute position from the beginning of the file plus
+.Fa iocb->aio_offset .
+.Pp
+If
+.Dv _POSIX_PRIORITIZED_IO
+is defined, and the descriptor supports it, then the enqueued
+operation is submitted at a priority equal to that of the calling
+process minus
+.Fa iocb->aio_reqprio .
+.Pp
+The
+.Fa iocb
+pointer may be subsequently used as an argument to
+.Fn aio_return
+and
+.Fn aio_error
+in order to determine return or error status for the enqueued operation
+while it is in progress.
+.Pp
+If the request is successfully enqueued, the value of
+.Fa iocb->aio_offset
+can be modified during the request as context, so this value must not
+be referenced after the request is enqueued.
+.Sh RESTRICTIONS
+The Asynchronous I/O Control Block structure pointed to by
+.Fa iocb
+and the buffer that the
+.Fa iocb->aio_buf
+member of that structure references must remain valid until the
+operation has completed.
+For this reason, use of auto (stack) variables
+for these objects is discouraged.
+.Pp
+The asynchronous I/O control buffer
+.Fa iocb
+should be zeroed before the
+.Fn aio_write
+system call to avoid passing bogus context information to the kernel.
+.Pp
+Modifications of the Asynchronous I/O Control Block structure or the
+buffer contents after the request has been enqueued, but before the
+request has completed, are not allowed.
+.Pp
+If the file offset in
+.Fa iocb->aio_offset
+is past the offset maximum for
+.Fa iocb->aio_fildes ,
+no I/O will occur.
+.Sh RETURN VALUES
+.Rv -std aio_write
+.Sh ERRORS
+The
+.Fn aio_write
+system call will fail if:
+.Bl -tag -width Er
+.It Bq Er EAGAIN
+The request was not queued because of system resource limitations.
+.It Bq Er ENOSYS
+The
+.Fn aio_write
+system call is not supported.
+.El
+.Pp
+The following conditions may be synchronously detected when the
+.Fn aio_write
+system call is made, or asynchronously, at any time thereafter.
+If they
+are detected at call time,
+.Fn aio_write
+returns -1 and sets
+.Va errno
+appropriately; otherwise the
+.Fn aio_return
+system call must be called, and will return -1, and
+.Fn aio_error
+must be called to determine the actual value that would have been
+returned in
+.Va errno .
+.Bl -tag -width Er
+.It Bq Er EBADF
+The
+.Fa iocb->aio_fildes
+argument
+is invalid, or is not opened for writing.
+.It Bq Er EINVAL
+The offset
+.Fa iocb->aio_offset
+is not valid, the priority specified by
+.Fa iocb->aio_reqprio
+is not a valid priority, or the number of bytes specified by
+.Fa iocb->aio_nbytes
+is not valid.
+.El
+.Pp
+If the request is successfully enqueued, but subsequently canceled
+or an error occurs, the value returned by the
+.Fn aio_return
+system call is per the
+.Xr write 2
+system call, and the value returned by the
+.Fn aio_error
+system call is either one of the error returns from the
+.Xr write 2
+system call, or one of:
+.Bl -tag -width Er
+.It Bq Er EBADF
+The
+.Fa iocb->aio_fildes
+argument
+is invalid for writing.
+.It Bq Er ECANCELED
+The request was explicitly canceled via a call to
+.Fn aio_cancel .
+.It Bq Er EINVAL
+The offset
+.Fa iocb->aio_offset
+would be invalid.
+.El
+.Sh SEE ALSO
+.Xr aio_cancel 2 ,
+.Xr aio_error 2 ,
+.Xr aio_return 2 ,
+.Xr aio_suspend 2 ,
+.Xr aio_waitcomplete 2 ,
+.Xr siginfo 3 ,
+.Xr aio 4
+.Sh STANDARDS
+The
+.Fn aio_write
+system call
+is expected to conform to the
+.St -p1003.1
+standard.
+.Sh HISTORY
+The
+.Fn aio_write
+system call first appeared in
+.Fx 3.0 .
+.Sh AUTHORS
+This manual page was written by
+.An Wes Peters Aq wes@softweyr.com .
+.Sh BUGS
+Invalid information in
+.Fa iocb->_aiocb_private
+may confuse the kernel.
diff --git a/lib/libc/sys/bind.2 b/lib/libc/sys/bind.2
new file mode 100644
index 0000000..fecc5fa
--- /dev/null
+++ b/lib/libc/sys/bind.2
@@ -0,0 +1,134 @@
+.\" Copyright (c) 1983, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"     @(#)bind.2	8.1 (Berkeley) 6/4/93
+.\" $FreeBSD$
+.\"
+.Dd June 4, 1993
+.Dt BIND 2
+.Os
+.Sh NAME
+.Nm bind
+.Nd assign a local protocol address to a socket
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In sys/types.h
+.In sys/socket.h
+.Ft int
+.Fn bind "int s" "const struct sockaddr *addr" "socklen_t addrlen"
+.Sh DESCRIPTION
+The
+.Fn bind
+system call
+assigns the local protocol address to a socket.
+When a socket is created
+with
+.Xr socket 2
+it exists in an address family space but has no protocol address assigned.
+The
+.Fn bind
+system call requests that
+.Fa addr
+be assigned to the socket.
+.Sh NOTES
+Binding an address in the UNIX domain creates a socket in the file
+system that must be deleted by the caller when it is no longer
+needed (using
+.Xr unlink 2 ) .
+.Pp
+The rules used in address binding vary between communication domains.
+Consult the manual entries in section 4 for detailed information.
+.Pp
+For maximum portability, you should always zero the socket address structure
+before populating it and passing it to
+.Fn bind .
+.Sh RETURN VALUES
+.Rv -std bind
+.Sh ERRORS
+The
+.Fn bind
+system call will fail if:
+.Bl -tag -width Er
+.It Bq Er EAGAIN
+Kernel resources to complete the request are
+temporarily unavailable.
+.It Bq Er EBADF
+The
+.Fa s
+argument
+is not a valid descriptor.
+.It Bq Er EINVAL
+The socket is already bound to an address, and the protocol does not support
+binding to a new address; or the socket has been shut down.
+.It Bq Er ENOTSOCK
+The
+.Fa s
+argument
+is not a socket.
+.It Bq Er EADDRNOTAVAIL
+The specified address is not available from the local machine.
+.It Bq Er EADDRINUSE
+The specified address is already in use.
+.It Bq Er EACCES
+The requested address is protected, and the current user
+has inadequate permission to access it.
+.It Bq Er EFAULT
+The
+.Fa addr
+argument is not in a valid part of the user
+address space.
+.El
+.Pp
+The following errors are specific to binding addresses in the UNIX domain.
+.Bl -tag -width EADDRNOTAVA
+.It Bq Er ENOTDIR
+A component of the path prefix is not a directory.
+.It Bq Er ENAMETOOLONG
+A component of a pathname exceeded 255 characters,
+or an entire path name exceeded 1023 characters.
+.It Bq Er ENOENT
+A prefix component of the path name does not exist.
+.It Bq Er ELOOP
+Too many symbolic links were encountered in translating the pathname.
+.It Bq Er EIO
+An I/O error occurred while making the directory entry or allocating the inode.
+.It Bq Er EROFS
+The name would reside on a read-only file system.
+.It Bq Er EISDIR
+An empty pathname was specified.
+.El
+.Sh SEE ALSO
+.Xr connect 2 ,
+.Xr getsockname 2 ,
+.Xr listen 2 ,
+.Xr socket 2
+.Sh HISTORY
+The
+.Fn bind
+system call appeared in
+.Bx 4.2 .
diff --git a/lib/libc/sys/brk.2 b/lib/libc/sys/brk.2
new file mode 100644
index 0000000..31dea32
--- /dev/null
+++ b/lib/libc/sys/brk.2
@@ -0,0 +1,171 @@
+.\" Copyright (c) 1980, 1991, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"     @(#)brk.2	8.4 (Berkeley) 5/1/95
+.\" $FreeBSD$
+.\"
+.Dd July 12, 1999
+.Dt BRK 2
+.Os
+.Sh NAME
+.Nm brk ,
+.Nm sbrk
+.Nd change data segment size
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In sys/types.h
+.In unistd.h
+.Ft int
+.Fn brk "const void *addr"
+.Ft void *
+.Fn sbrk "intptr_t incr"
+.Sh DESCRIPTION
+.Bf -symbolic
+The
+.Fn brk
+and
+.Fn sbrk
+functions are legacy interfaces from before the
+advent of modern virtual memory management.
+.Ef
+.Pp
+The
+.Fn brk
+and
+.Fn sbrk
+functions are used to change the amount of memory allocated in a
+process's data segment.
+They do this by moving the location of the
+.Dq break .
+The break is the first address after the end of the process's
+uninitialized data segment (also known as the
+.Dq BSS ) .
+.Pp
+The
+.Fn brk
+function
+sets the break to
+.Fa addr .
+.Pp
+The
+.Fn sbrk
+function raises the break by
+.Fa incr
+bytes, thus allocating at least
+.Fa incr
+bytes of new memory in the data segment.
+If
+.Fa incr
+is negative,
+the break is lowered by
+.Fa incr
+bytes.
+.Sh NOTES
+While the actual process data segment size maintained by the kernel will only
+grow or shrink in page sizes, these functions allow setting the break
+to unaligned values (i.e., it may point to any address inside the last
+page of the data segment).
+.Pp
+The current value of the program break may be determined by calling
+.Fn sbrk 0 .
+See also
+.Xr end 3 .
+.Pp
+The
+.Xr getrlimit 2
+system call may be used to determine
+the maximum permissible size of the
+data segment.
+It will not be possible to set the break
+beyond
+.Dq Va etext No + Va rlim.rlim_max
+where the
+.Va rlim.rlim_max
+value is returned from a call to
+.Fn getrlimit RLIMIT_DATA &rlim .
+(See
+.Xr end 3
+for the definition of
+.Va etext ) .
+.Sh RETURN VALUES
+.Rv -std brk
+.Pp
+The
+.Fn sbrk
+function returns the prior break value if successful;
+otherwise the value
+.Po Vt "void *" Pc Ns \-1
+is returned and the global variable
+.Va errno
+is set to indicate the error.
+.Sh ERRORS
+The
+.Fn brk
+and
+.Fn sbrk
+functions
+will fail if:
+.Bl -tag -width Er
+.It Bq Er EINVAL
+The requested break value was beyond the beginning of the data segment.
+.It Bq Er ENOMEM
+The data segment size limit, as set by
+.Xr setrlimit 2 ,
+was exceeded.
+.It Bq Er ENOMEM
+Insufficient space existed in the swap area
+to support the expansion of the data segment.
+.El
+.Sh SEE ALSO
+.Xr execve 2 ,
+.Xr getrlimit 2 ,
+.Xr mmap 2 ,
+.Xr end 3 ,
+.Xr free 3 ,
+.Xr malloc 3
+.Sh HISTORY
+The
+.Fn brk
+function appeared in
+.At v7 .
+.Sh BUGS
+Mixing
+.Fn brk
+or
+.Fn sbrk
+with
+.Xr malloc 3 ,
+.Xr free 3 ,
+or similar functions will result in non-portable program behavior.
+.Pp
+Setting the break may fail due to a temporary lack of
+swap space.
+It is not possible to distinguish this
+from a failure caused by exceeding the maximum size of
+the data segment without consulting
+.Xr getrlimit 2 .
diff --git a/lib/libc/sys/chdir.2 b/lib/libc/sys/chdir.2
new file mode 100644
index 0000000..33940c3
--- /dev/null
+++ b/lib/libc/sys/chdir.2
@@ -0,0 +1,132 @@
+.\" Copyright (c) 1980, 1991, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"     @(#)chdir.2	8.2 (Berkeley) 12/11/93
+.\" $FreeBSD$
+.\"
+.Dd December 11, 1993
+.Dt CHDIR 2
+.Os
+.Sh NAME
+.Nm chdir ,
+.Nm fchdir
+.Nd change current working directory
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In unistd.h
+.Ft int
+.Fn chdir "const char *path"
+.Ft int
+.Fn fchdir "int fd"
+.Sh DESCRIPTION
+The
+.Fa path
+argument points to the pathname of a directory.
+The
+.Fn chdir
+system call
+causes the named directory
+to become the current working directory, that is,
+the starting point for path searches of pathnames not beginning with
+a slash,
+.Ql / .
+.Pp
+The
+.Fn fchdir
+system call
+causes the directory referenced by
+.Fa fd
+to become the current working directory,
+the starting point for path searches of pathnames not beginning with
+a slash,
+.Ql / .
+.Pp
+In order for a directory to become the current directory,
+a process must have execute (search) access to the directory.
+.Sh RETURN VALUES
+.Rv -std
+.Sh ERRORS
+The
+.Fn chdir
+system call
+will fail and the current working directory will be unchanged if
+one or more of the following are true:
+.Bl -tag -width Er
+.It Bq Er ENOTDIR
+A component of the path prefix is not a directory.
+.It Bq Er ENAMETOOLONG
+A component of a pathname exceeded 255 characters,
+or an entire path name exceeded 1023 characters.
+.It Bq Er ENOENT
+The named directory does not exist.
+.It Bq Er ELOOP
+Too many symbolic links were encountered in translating the pathname.
+.It Bq Er EACCES
+Search permission is denied for any component of
+the path name.
+.It Bq Er EFAULT
+The
+.Fa path
+argument
+points outside the process's allocated address space.
+.It Bq Er EIO
+An I/O error occurred while reading from or writing to the file system.
+.El
+.Pp
+The
+.Fn fchdir
+system call
+will fail and the current working directory will be unchanged if
+one or more of the following are true:
+.Bl -tag -width Er
+.It Bq Er EACCES
+Search permission is denied for the directory referenced by the
+file descriptor.
+.It Bq Er ENOTDIR
+The file descriptor does not reference a directory.
+.It Bq Er EBADF
+The argument
+.Fa fd
+is not a valid file descriptor.
+.El
+.Sh SEE ALSO
+.Xr chroot 2
+.Sh STANDARDS
+The
+.Fn chdir
+system call is expected to conform to
+.St -p1003.1-90 .
+.Sh HISTORY
+The
+.Fn chdir
+system call appeared in
+.At v7 .
+The
+.Fn fchdir
+system call appeared in
+.Bx 4.2 .
diff --git a/lib/libc/sys/chflags.2 b/lib/libc/sys/chflags.2
new file mode 100644
index 0000000..7780427
--- /dev/null
+++ b/lib/libc/sys/chflags.2
@@ -0,0 +1,227 @@
+.\" Copyright (c) 1989, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"	@(#)chflags.2	8.3 (Berkeley) 5/2/95
+.\" $FreeBSD$
+.\"
+.Dd May 16, 2006
+.Dt CHFLAGS 2
+.Os
+.Sh NAME
+.Nm chflags ,
+.Nm lchflags ,
+.Nm fchflags
+.Nd set file flags
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In sys/stat.h
+.In unistd.h
+.Ft int
+.Fn chflags "const char *path" "u_long flags"
+.Ft int
+.Fn lchflags "const char *path" "int flags"
+.Ft int
+.Fn fchflags "int fd" "u_long flags"
+.Sh DESCRIPTION
+The file whose name
+is given by
+.Fa path
+or referenced by the descriptor
+.Fa fd
+has its flags changed to
+.Fa flags .
+.Pp
+The
+.Fn lchflags
+system call is like
+.Fn chflags
+except in the case where the named file is a symbolic link,
+in which case
+.Fn lchflags
+will change the flags of the link itself,
+rather than the file it points to.
+.Pp
+The flags specified are formed by
+.Em or Ns 'ing
+the following values
+.Pp
+.Bl -tag -width ".Dv SF_IMMUTABLE" -compact -offset indent
+.It Dv UF_NODUMP
+Do not dump the file.
+.It Dv UF_IMMUTABLE
+The file may not be changed.
+.It Dv UF_APPEND
+The file may only be appended to.
+.It Dv UF_NOUNLINK
+The file may not be renamed or deleted.
+.It Dv UF_OPAQUE
+The directory is opaque when viewed through a union stack.
+.It Dv SF_ARCHIVED
+The file may be archived.
+.It Dv SF_IMMUTABLE
+The file may not be changed.
+.It Dv SF_APPEND
+The file may only be appended to.
+.It Dv SF_NOUNLINK
+The file may not be renamed or deleted.
+.It Dv SF_SNAPSHOT
+The file is a snapshot file.
+.El
+.Pp
+If one of
+.Dv SF_IMMUTABLE , SF_APPEND ,
+or
+.Dv SF_NOUNLINK
+is set a non-super-user cannot change any flags and even the super-user
+can change flags only if securelevel is greater than 0.
+(See
+.Xr init 8
+for details.)
+.Pp
+The
+.Dv UF_IMMUTABLE , UF_APPEND , UF_NOUNLINK , UF_NODUMP ,
+and
+.Dv UF_OPAQUE
+flags may be set or unset by either the owner of a file or the super-user.
+.Pp
+The
+.Dv SF_IMMUTABLE , SF_APPEND , SF_NOUNLINK ,
+and
+.Dv SF_ARCHIVED
+flags may only be set or unset by the super-user.
+Attempts to set these flags by non-super-users are rejected, attempts by
+non-superusers to clear flags that are already unset are silently ignored.
+These flags may be set at any time, but normally may only be unset when
+the system is in single-user mode.
+(See
+.Xr init 8
+for details.)
+.Pp
+The
+.Dv SF_SNAPSHOT
+flag is maintained by the system and cannot be changed by any user.
+.Sh RETURN VALUES
+.Rv -std
+.Sh ERRORS
+The
+.Fn chflags
+system call will fail if:
+.Bl -tag -width Er
+.It Bq Er ENOTDIR
+A component of the path prefix is not a directory.
+.It Bq Er ENAMETOOLONG
+A component of a pathname exceeded 255 characters,
+or an entire path name exceeded 1023 characters.
+.It Bq Er ENOENT
+The named file does not exist.
+.It Bq Er EACCES
+Search permission is denied for a component of the path prefix.
+.It Bq Er ELOOP
+Too many symbolic links were encountered in translating the pathname.
+.It Bq Er EPERM
+The effective user ID does not match the owner of the file and
+the effective user ID is not the super-user.
+.It Bq Er EPERM
+One of
+.Dv SF_IMMUTABLE , SF_APPEND ,
+or
+.Dv SF_NOUNLINK
+is set and the user is either not the super-user or
+securelevel is greater than 0.
+.It Bq Er EPERM
+A non-super-user tries to set one of
+.Dv SF_IMMUTABLE , SF_APPEND ,
+or
+.Dv SF_NOUNLINK .
+.It Bq Er EPERM
+User tries to set or remove the
+.Dv SF_SNAPSHOT
+flag.
+.It Bq Er EROFS
+The named file resides on a read-only file system.
+.It Bq Er EFAULT
+The
+.Fa path
+argument
+points outside the process's allocated address space.
+.It Bq Er EIO
+An
+.Tn I/O
+error occurred while reading from or writing to the file system.
+.It Bq Er EOPNOTSUPP
+The underlying file system does not support file flags.
+.El
+.Pp
+The
+.Fn fchflags
+system call will fail if:
+.Bl -tag -width Er
+.It Bq Er EBADF
+The descriptor is not valid.
+.It Bq Er EINVAL
+The
+.Fa fd
+argument
+refers to a socket, not to a file.
+.It Bq Er EPERM
+The effective user ID does not match the owner of the file and
+the effective user ID is not the super-user.
+.It Bq Er EPERM
+One of
+.Dv SF_IMMUTABLE , SF_APPEND ,
+or
+.Dv SF_NOUNLINK
+is set and the user is either not the super-user or
+securelevel is greater than 0.
+.It Bq Er EPERM
+A non-super-user tries to set one of
+.Dv SF_IMMUTABLE , SF_APPEND ,
+or
+.Dv SF_NOUNLINK .
+.It Bq Er EROFS
+The file resides on a read-only file system.
+.It Bq Er EIO
+An
+.Tn I/O
+error occurred while reading from or writing to the file system.
+.It Bq Er EOPNOTSUPP
+The underlying file system does not support file flags.
+.El
+.Sh SEE ALSO
+.Xr chflags 1 ,
+.Xr fflagstostr 3 ,
+.Xr strtofflags 3 ,
+.Xr init 8 ,
+.Xr mount_unionfs 8
+.Sh HISTORY
+The
+.Fn chflags
+and
+.Fn fchflags
+system calls first appeared in
+.Bx 4.4 .
diff --git a/lib/libc/sys/chmod.2 b/lib/libc/sys/chmod.2
new file mode 100644
index 0000000..3547aec
--- /dev/null
+++ b/lib/libc/sys/chmod.2
@@ -0,0 +1,321 @@
+.\" Copyright (c) 1980, 1991, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"     @(#)chmod.2	8.1 (Berkeley) 6/4/93
+.\" $FreeBSD$
+.\"
+.Dd April 10, 2008
+.Dt CHMOD 2
+.Os
+.Sh NAME
+.Nm chmod ,
+.Nm fchmod ,
+.Nm lchmod ,
+.Nm fchmodat
+.Nd change mode of file
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In sys/stat.h
+.Ft int
+.Fn chmod "const char *path" "mode_t mode"
+.Ft int
+.Fn fchmod "int fd" "mode_t mode"
+.Ft int
+.Fn lchmod "const char *path" "mode_t mode"
+.Ft int
+.Fn fchmodat "int fd" "const char *path" "mode_t mode" "int flag"
+.Sh DESCRIPTION
+The file permission bits of the file named specified by
+.Fa path
+or referenced by the file descriptor
+.Fa fd
+are changed to
+.Fa mode .
+The
+.Fn chmod
+system call verifies that the process owner (user) either owns
+the file specified by
+.Fa path
+(or
+.Fa fd ) ,
+or
+is the super-user.
+The
+.Fn chmod
+system call follows symbolic links to operate on the target of the link
+rather than the link itself.
+.Pp
+The
+.Fn lchmod
+system call is similar to
+.Fn chmod
+but does not follow symbolic links.
+.Pp
+The
+.Fn fchmodat
+is equivalent to either
+.Fn chmod
+or
+.Fn lchmod
+depending on the
+.Fa flag
+except in the case where
+.Fa path
+specifies a relative path.
+In this case the file to be changed is determined relative to the directory
+associated with the file descriptor
+.Fa fd
+instead of the current working directory.
+The values for the
+.Fa flag
+are constructed by a bitwise-inclusive OR of flags from the following list, defined
+in
+.In fcntl.h :
+.Bl -tag -width indent
+.It Dv AT_SYMLINK_NOFOLLOW
+If
+.Fa path
+names a symbolic link, then the mode of the symbolic link is changed.
+.El
+.Pp
+If
+.Fn fchmodat
+is passed the special value
+.Dv AT_FDCWD
+in the
+.Fa fd
+parameter, the current working directory is used.
+If also
+.Fa flag
+is zero, the behavior is identical to a call to
+.Fn chmod .
+.Pp
+A mode is created from
+.Em or'd
+permission bit masks
+defined in
+.In sys/stat.h :
+.Pp
+.Bd -literal -offset indent -compact
+#define S_IRWXU 0000700    /* RWX mask for owner */
+#define S_IRUSR 0000400    /* R for owner */
+#define S_IWUSR 0000200    /* W for owner */
+#define S_IXUSR 0000100    /* X for owner */
+
+#define S_IRWXG 0000070    /* RWX mask for group */
+#define S_IRGRP 0000040    /* R for group */
+#define S_IWGRP 0000020    /* W for group */
+#define S_IXGRP 0000010    /* X for group */
+
+#define S_IRWXO 0000007    /* RWX mask for other */
+#define S_IROTH 0000004    /* R for other */
+#define S_IWOTH 0000002    /* W for other */
+#define S_IXOTH 0000001    /* X for other */
+
+#define S_ISUID 0004000    /* set user id on execution */
+#define S_ISGID 0002000    /* set group id on execution */
+#ifndef __BSD_VISIBLE
+#define S_ISTXT 0001000    /* sticky bit */
+#endif
+.Ed
+.Pp
+The
+.Fx
+VM system totally ignores the sticky bit
+.Pq Dv ISTXT
+for executables.
+On UFS-based file systems (FFS, LFS) the sticky
+bit may only be set upon directories.
+.Pp
+If mode
+.Dv ISTXT
+(the `sticky bit') is set on a directory,
+an unprivileged user may not delete or rename
+files of other users in that directory.
+The sticky bit may be
+set by any user on a directory which the user owns or has appropriate
+permissions.
+For more details of the properties of the sticky bit, see
+.Xr sticky 8 .
+.Pp
+If mode ISUID (set UID) is set on a directory,
+and the MNT_SUIDDIR option was used in the mount of the file system,
+then the owner of any new files and sub-directories
+created within this directory are set
+to be the same as the owner of that directory.
+If this function is enabled, new directories will inherit
+the bit from their parents.
+Execute bits are removed from
+the file, and it will not be given to root.
+This behavior does not change the
+requirements for the user to be allowed to write the file, but only the eventual
+owner after it has been created.
+Group inheritance is not affected.
+.Pp
+This feature is designed for use on fileservers serving PC users via
+ftp, SAMBA, or netatalk.
+It provides security holes for shell users and as
+such should not be used on shell machines, especially on home directories.
+This option requires the SUIDDIR
+option in the kernel to work.
+Only UFS file systems support this option.
+For more details of the suiddir mount option, see
+.Xr mount 8 .
+.Pp
+Writing or changing the owner of a file
+turns off the set-user-id and set-group-id bits
+unless the user is the super-user.
+This makes the system somewhat more secure
+by protecting set-user-id (set-group-id) files
+from remaining set-user-id (set-group-id) if they are modified,
+at the expense of a degree of compatibility.
+.Sh RETURN VALUES
+.Rv -std
+.Sh ERRORS
+The
+.Fn chmod
+system call
+will fail and the file mode will be unchanged if:
+.Bl -tag -width Er
+.It Bq Er ENOTDIR
+A component of the path prefix is not a directory.
+.It Bq Er ENAMETOOLONG
+A component of a pathname exceeded 255 characters,
+or an entire path name exceeded 1023 characters.
+.It Bq Er ENOENT
+The named file does not exist.
+.It Bq Er EACCES
+Search permission is denied for a component of the path prefix.
+.It Bq Er ELOOP
+Too many symbolic links were encountered in translating the pathname.
+.It Bq Er EPERM
+The effective user ID does not match the owner of the file and
+the effective user ID is not the super-user.
+.It Bq Er EPERM
+The effective user ID is not the super-user, the effective user ID do match the
+owner of the file, but the group ID of the file does not match the effective
+group ID nor one of the supplementary group IDs.
+.It Bq Er EPERM
+The named file has its immutable or append-only flag set, see the
+.Xr chflags 2
+manual page for more information.
+.It Bq Er EROFS
+The named file resides on a read-only file system.
+.It Bq Er EFAULT
+The
+.Fa path
+argument
+points outside the process's allocated address space.
+.It Bq Er EIO
+An I/O error occurred while reading from or writing to the file system.
+.It Bq Er EFTYPE
+The effective user ID is not the super-user, the mode includes the sticky bit
+.Dv ( S_ISVTX ) ,
+and path does not refer to a directory.
+.El
+.Pp
+The
+.Fn fchmod
+system call will fail if:
+.Bl -tag -width Er
+.It Bq Er EBADF
+The descriptor is not valid.
+.It Bq Er EINVAL
+The
+.Fa fd
+argument
+refers to a socket, not to a file.
+.It Bq Er EROFS
+The file resides on a read-only file system.
+.It Bq Er EIO
+An I/O error occurred while reading from or writing to the file system.
+.El
+.Pp
+In addition to the
+.Fn chmod
+errors,
+.Fn fchmodat
+fails if:
+.Bl -tag -width Er
+.It Bq Er EBADF
+The
+.Fa path
+argument does not specify an absolute path and the
+.Fa fd
+argument is neither
+.Fa AT_FDCWD
+nor a valid file descriptor open for searching.
+.It Bq Er EINVAL
+The value of the
+.Fa flag
+argument is not valid.
+.It Bq Er ENOTDIR
+The
+.Fa path
+argument is not an absolute path and
+.Fa fd
+is neither
+.Dv AT_FDCWD
+nor a file descriptor associated with a directory.
+.El
+.Sh SEE ALSO
+.Xr chmod 1 ,
+.Xr chflags 2 ,
+.Xr chown 2 ,
+.Xr open 2 ,
+.Xr stat 2 ,
+.Xr sticky 8
+.Sh STANDARDS
+The
+.Fn chmod
+system call is expected to conform to
+.St -p1003.1-90 ,
+except for the return of
+.Er EFTYPE
+and the use of
+.Dv S_ISTXT .
+The
+.Fn fchmodat
+system call follows The Open Group Extended API Set 2 specification.
+.Sh HISTORY
+The
+.Fn chmod
+function appeared in
+.At v7 .
+The
+.Fn fchmod
+system call appeared in
+.Bx 4.2 .
+The
+.Fn lchmod
+system call appeared in
+.Fx 3.0 .
+The
+.Fn fchmodat
+system call appeared in
+.Fx 8.0 .
diff --git a/lib/libc/sys/chown.2 b/lib/libc/sys/chown.2
new file mode 100644
index 0000000..32c29ff
--- /dev/null
+++ b/lib/libc/sys/chown.2
@@ -0,0 +1,268 @@
+.\" Copyright (c) 1980, 1991, 1993, 1994
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"     @(#)chown.2	8.4 (Berkeley) 4/19/94
+.\" $FreeBSD$
+.\"
+.Dd April 10, 2008
+.Dt CHOWN 2
+.Os
+.Sh NAME
+.Nm chown ,
+.Nm fchown ,
+.Nm lchown ,
+.Nm fchownat
+.Nd change owner and group of a file
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In unistd.h
+.Ft int
+.Fn chown "const char *path" "uid_t owner" "gid_t group"
+.Ft int
+.Fn fchown "int fd" "uid_t owner" "gid_t group"
+.Ft int
+.Fn lchown "const char *path" "uid_t owner" "gid_t group"
+.Ft int
+.Fn fchownat "int fd" "const char *path" "uid_t owner" "gid_t group" "int flag"
+.Sh DESCRIPTION
+The owner ID and group ID of the file
+named by
+.Fa path
+or referenced by
+.Fa fd
+is changed as specified by the arguments
+.Fa owner
+and
+.Fa group .
+The owner of a file may change the
+.Fa group
+to a group of which
+he or she is a member,
+but the change
+.Fa owner
+capability is restricted to the super-user.
+.Pp
+The
+.Fn chown
+system call
+clears the set-user-id and set-group-id bits
+on the file
+to prevent accidental or mischievous creation of
+set-user-id and set-group-id programs if not executed
+by the super-user.
+The
+.Fn chown
+system call
+follows symbolic links to operate on the target of the link
+rather than the link itself.
+.Pp
+The
+.Fn fchown
+system call
+is particularly useful when used in conjunction
+with the file locking primitives (see
+.Xr flock 2 ) .
+.Pp
+The
+.Fn lchown
+system call is similar to
+.Fn chown
+but does not follow symbolic links.
+.Pp
+The
+.Fn fchownat
+system call is equivalent to the
+.Fn chown
+and
+.Fn lchown
+except in the case where
+.Fa path
+specifies a relative path.
+In this case the file to be changed is determined relative to the directory
+associated with the file descriptor
+.Fa fd
+instead of the current working directory.
+.Pp
+Values for
+.Fa flag
+are constructed by a bitwise-inclusive OR of flags from the following
+list, defined in
+.In fcntl.h :
+.Bl -tag -width indent
+.It Dv AT_SYMLINK_NOFOLLOW
+If
+.Fa path
+names a symbolic link, ownership of the symbolic link is changed.
+.El
+.Pp
+If
+.Fn fchownat
+is passed the special value
+.Dv AT_FDCWD
+in the
+.Fa fd
+parameter, the current working directory is used and the behavior is identical
+to a call to
+.Fn chown
+or
+.Fn lchown
+respectively, depending on whether or not the
+.Dv AT_SYMLINK_NOFOLLOW
+bit is set in the
+.Fa flag
+argument.
+.Pp
+One of the owner or group id's
+may be left unchanged by specifying it as -1.
+.Sh RETURN VALUES
+.Rv -std
+.Sh ERRORS
+The
+.Fn chown
+and
+.Fn lchown
+will fail and the file will be unchanged if:
+.Bl -tag -width Er
+.It Bq Er ENOTDIR
+A component of the path prefix is not a directory.
+.It Bq Er ENAMETOOLONG
+A component of a pathname exceeded 255 characters,
+or an entire path name exceeded 1023 characters.
+.It Bq Er ENOENT
+The named file does not exist.
+.It Bq Er EACCES
+Search permission is denied for a component of the path prefix.
+.It Bq Er ELOOP
+Too many symbolic links were encountered in translating the pathname.
+.It Bq Er EPERM
+The operation would change the ownership, but the effective user ID is not the
+super-user.
+.It Bq Er EPERM
+The named file has its immutable or append-only flag set, see the
+.Xr chflags 2
+manual page for more information.
+.It Bq Er EROFS
+The named file resides on a read-only file system.
+.It Bq Er EFAULT
+The
+.Fa path
+argument
+points outside the process's allocated address space.
+.It Bq Er EIO
+An I/O error occurred while reading from or writing to the file system.
+.El
+.Pp
+The
+.Fn fchown
+system call will fail if:
+.Bl -tag -width Er
+.It Bq Er EBADF
+The
+.Fa fd
+argument
+does not refer to a valid descriptor.
+.It Bq Er EINVAL
+The
+.Fa fd
+argument
+refers to a socket, not a file.
+.It Bq Er EPERM
+The effective user ID is not the super-user.
+.It Bq Er EROFS
+The named file resides on a read-only file system.
+.It Bq Er EIO
+An I/O error occurred while reading from or writing to the file system.
+.El
+.Pp
+In addition to the errors specified for
+.Fn chown
+and
+.Fn lchown ,
+the
+.Fn fchownat
+system call may fail if:
+.Bl -tag -width Er
+.It Bq Er EBADF
+The
+.Fa path
+argument does not specify an absolute path and the
+.Fa fd
+argument is neither
+.Dv AT_FDCWD
+nor a valid file descriptor open for searching.
+.It Bq Er EINVAL
+The value of the
+.Fa flag
+argument is not valid.
+.It Bq Er ENOTDIR
+The
+.Fa path
+argument is not an absolute path and
+.Fa fd
+is neither
+.Dv AT_FDCWD
+nor a file descriptor associated with a directory.
+.El
+.Sh SEE ALSO
+.Xr chgrp 1 ,
+.Xr chflags 2 ,
+.Xr chmod 2 ,
+.Xr flock 2 ,
+.Xr chown 8
+.Sh STANDARDS
+The
+.Fn chown
+system call is expected to conform to
+.St -p1003.1-90 .
+The
+.Fn fchownat
+system call follows The Open Group Extended API Set 2 specification.
+.Sh HISTORY
+The
+.Fn chown
+function appeared in
+.At v7 .
+The
+.Fn fchown
+system call appeared in
+.Bx 4.2 .
+.Pp
+The
+.Fn chown
+system call was changed to follow symbolic links in
+.Bx 4.4 .
+The
+.Fn lchown
+system call was added in
+.Fx 3.0
+to compensate for the loss of functionality.
+.Pp
+The
+.Fn fchownat
+system call appeared in
+.Fx 8.0 .
diff --git a/lib/libc/sys/chroot.2 b/lib/libc/sys/chroot.2
new file mode 100644
index 0000000..ecf2eb5
--- /dev/null
+++ b/lib/libc/sys/chroot.2
@@ -0,0 +1,142 @@
+.\" Copyright (c) 1983, 1991, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"     @(#)chroot.2	8.1 (Berkeley) 6/4/93
+.\" $FreeBSD$
+.\"
+.Dd June 4, 1993
+.Dt CHROOT 2
+.Os
+.Sh NAME
+.Nm chroot
+.Nd change root directory
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In unistd.h
+.Ft int
+.Fn chroot "const char *dirname"
+.Sh DESCRIPTION
+The
+.Fa dirname
+argument
+is the address of the pathname of a directory, terminated by an ASCII NUL.
+The
+.Fn chroot
+system call causes
+.Fa dirname
+to become the root directory,
+that is, the starting point for path searches of pathnames
+beginning with
+.Ql / .
+.Pp
+In order for a directory to become the root directory
+a process must have execute (search) access for that directory.
+.Pp
+It should be noted that
+.Fn chroot
+has no effect on the process's current directory.
+.Pp
+This call is restricted to the super-user.
+.Pp
+Depending on the setting of the
+.Ql kern.chroot_allow_open_directories
+sysctl variable, open filedescriptors which reference directories
+will make the
+.Fn chroot
+fail as follows:
+.Pp
+If
+.Ql kern.chroot_allow_open_directories
+is set to zero,
+.Fn chroot
+will always fail with
+.Er EPERM
+if there are any directories open.
+.Pp
+If
+.Ql kern.chroot_allow_open_directories
+is set to one (the default),
+.Fn chroot
+will fail with
+.Er EPERM
+if there are any directories open and the
+process is already subject to the
+.Fn chroot
+system call.
+.Pp
+Any other value for
+.Ql kern.chroot_allow_open_directories
+will bypass the check for open directories
+.Pp
+Upon successful completion, a value of 0 is returned.
+Otherwise,
+a value of -1 is returned and
+.Va errno
+is set to indicate an error.
+.Sh ERRORS
+The
+.Fn chroot
+system call
+will fail and the root directory will be unchanged if:
+.Bl -tag -width Er
+.It Bq Er ENOTDIR
+A component of the path name is not a directory.
+.It Bq Er EPERM
+The effective user ID is not the super-user, or one or more
+filedescriptors are open directories.
+.It Bq Er ENAMETOOLONG
+A component of a pathname exceeded 255 characters,
+or an entire path name exceeded 1023 characters.
+.It Bq Er ENOENT
+The named directory does not exist.
+.It Bq Er EACCES
+Search permission is denied for any component of the path name.
+.It Bq Er ELOOP
+Too many symbolic links were encountered in translating the pathname.
+.It Bq Er EFAULT
+The
+.Fa dirname
+argument
+points outside the process's allocated address space.
+.It Bq Er EIO
+An I/O error occurred while reading from or writing to the file system.
+.El
+.Sh SEE ALSO
+.Xr chdir 2 ,
+.Xr jail 2
+.Sh HISTORY
+The
+.Fn chroot
+system call appeared in
+.Bx 4.2 .
+.Sh BUGS
+If the process is able to change its working directory to the target
+directory, but another access control check fails (such as a check for
+open directories, or a MAC check), it is possible that this system
+call may return an error, with the working directory of the process
+left changed.
diff --git a/lib/libc/sys/clock_gettime.2 b/lib/libc/sys/clock_gettime.2
new file mode 100644
index 0000000..583cc8f
--- /dev/null
+++ b/lib/libc/sys/clock_gettime.2
@@ -0,0 +1,168 @@
+.\"	$OpenBSD: clock_gettime.2,v 1.4 1997/05/08 20:21:16 kstailey Exp $
+.\"
+.\" Copyright (c) 1980, 1991, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd December 29, 2009
+.Dt CLOCK_GETTIME 2
+.Os
+.Sh NAME
+.Nm clock_gettime ,
+.Nm clock_settime ,
+.Nm clock_getres
+.Nd get/set/calibrate date and time
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In time.h
+.Ft int
+.Fn clock_gettime "clockid_t clock_id" "struct timespec *tp"
+.Ft int
+.Fn clock_settime "clockid_t clock_id" "const struct timespec *tp"
+.Ft int
+.Fn clock_getres "clockid_t clock_id" "struct timespec *tp"
+.Sh DESCRIPTION
+The
+.Fn clock_gettime
+and
+.Fn clock_settime
+system calls allow the calling process to retrieve or set the value
+used by a clock which is specified by
+.Fa clock_id .
+.Pp
+The
+.Fa clock_id
+argument
+can be one of the following values:
+.Dv CLOCK_REALTIME ,
+.Dv CLOCK_REALTIME_PRECISE ,
+.Dv CLOCK_REALTIME_FAST
+for time that increments as
+a wall clock should;
+.Dv CLOCK_MONOTONIC ,
+.Dv CLOCK_MONOTONIC_PRECISE ,
+.Dv CLOCK_MONOTONIC_FAST
+which increments in SI seconds;
+.Dv CLOCK_UPTIME ,
+.Dv CLOCK_UPTIME_PRECISE ,
+.Dv CLOCK_UPTIME_FAST
+which starts at zero when the kernel boots and increments
+monotonically in SI seconds while the machine is running;
+.Dv CLOCK_VIRTUAL
+for time that increments only when
+the CPU is running in user mode on behalf of the calling process;
+.Dv CLOCK_PROF
+for time that increments when the CPU is running in user or
+kernel mode; or
+.Dv CLOCK_SECOND
+which returns the current second without performing a full time counter
+query, using in-kernel cached value of current second.
+.Pp
+The clock IDs
+.Fa CLOCK_REALTIME_FAST ,
+.Fa CLOCK_MONOTONIC_FAST ,
+.Fa CLOCK_UPTIME_FAST
+are analogs of corresponding IDs without _FAST suffix but do not perform
+a full time counter query, so their accuracy is one timer tick.
+Similarly,
+.Fa CLOCK_REALTIME_PRECISE ,
+.Fa CLOCK_MONOTONIC_PRECISE ,
+.Fa CLOCK_UPTIME_PRECISE
+are used to get the most exact value as possible, at the expense of
+execution time.
+.Pp
+The structure pointed to by
+.Fa tp
+is defined in
+.In sys/timespec.h
+as:
+.Bd -literal
+struct timespec {
+	time_t	tv_sec;		/* seconds */
+	long	tv_nsec;	/* and nanoseconds */
+};
+.Ed
+.Pp
+Only the super-user may set the time of day, using only
+.Fa CLOCK_REALTIME .
+If the system securelevel is greater than 1 (see
+.Xr init 8 ) ,
+the time may only be advanced.
+This limitation is imposed to prevent a malicious super-user
+from setting arbitrary time stamps on files.
+The system time can still be adjusted backwards using the
+.Xr adjtime 2
+system call even when the system is secure.
+.Pp
+The resolution (granularity) of a clock is returned by the
+.Fn clock_getres
+system call.
+This value is placed in a (non-NULL)
+.Fa *tp .
+.Sh RETURN VALUES
+.Rv -std
+.Sh ERRORS
+The following error codes may be set in
+.Va errno :
+.Bl -tag -width Er
+.It Bq Er EINVAL
+The
+.Fa clock_id
+argument
+was not a valid value.
+.It Bq Er EFAULT
+The
+.Fa *tp
+argument address referenced invalid memory.
+.It Bq Er EPERM
+A user other than the super-user attempted to set the time.
+.El
+.Sh SEE ALSO
+.Xr date 1 ,
+.Xr adjtime 2 ,
+.Xr ctime 3 ,
+.Xr timed 8
+.Sh STANDARDS
+The
+.Fn clock_gettime ,
+.Fn clock_settime ,
+and
+.Fn clock_getres
+system calls conform to
+.St -p1003.1b-93 .
+The clock IDs
+.Fa CLOCK_REALTIME_FAST ,
+.Fa CLOCK_REALTIME_PRECISE ,
+.Fa CLOCK_MONOTONIC_FAST ,
+.Fa CLOCK_MONOTONIC_PRECISE ,
+.Fa CLOCK_UPTIME ,
+.Fa CLOCK_UPTIME_FAST ,
+.Fa CLOCK_UPTIME_PRECISE ,
+.Fa CLOCK_SECOND
+are FreeBSD extensions to the POSIX interface.
diff --git a/lib/libc/sys/close.2 b/lib/libc/sys/close.2
new file mode 100644
index 0000000..524322b
--- /dev/null
+++ b/lib/libc/sys/close.2
@@ -0,0 +1,140 @@
+.\" Copyright (c) 1980, 1991, 1993, 1994
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"     @(#)close.2	8.2 (Berkeley) 4/19/94
+.\" $FreeBSD$
+.\"
+.Dd December 4, 2006
+.Dt CLOSE 2
+.Os
+.Sh NAME
+.Nm close
+.Nd delete a descriptor
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In unistd.h
+.Ft int
+.Fn close "int d"
+.Sh DESCRIPTION
+The
+.Fn close
+system call deletes a descriptor from the per-process object
+reference table.
+If this is the last reference to the underlying object, the
+object will be deactivated.
+For example, on the last close of a file
+the current
+.Em seek
+pointer associated with the file is lost;
+on the last close of a
+.Xr socket 2
+associated naming information and queued data are discarded;
+on the last close of a file holding an advisory lock
+the lock is released (see further
+.Xr flock 2 ) .
+However, the semantics of System V and
+.St -p1003.1-88
+dictate that all
+.Xr fcntl 2
+advisory record locks associated with a file for a given process
+are removed when
+.Em any
+file descriptor for that file is closed by that process.
+.Pp
+When a process exits,
+all associated file descriptors are freed, but since there is
+a limit on active descriptors per processes, the
+.Fn close
+system call
+is useful when a large quantity of file descriptors are being handled.
+.Pp
+When a process forks (see
+.Xr fork 2 ) ,
+all descriptors for the new child process reference the same
+objects as they did in the parent before the fork.
+If a new process is then to be run using
+.Xr execve 2 ,
+the process would normally inherit these descriptors.
+Most
+of the descriptors can be rearranged with
+.Xr dup2 2
+or deleted with
+.Fn close
+before the
+.Xr execve 2
+is attempted, but if some of these descriptors will still
+be needed if the execve fails, it is necessary to arrange for them
+to be closed if the execve succeeds.
+For this reason, the call
+.Dq Li fcntl(d, F_SETFD, FD_CLOEXEC)
+is provided,
+which arranges that a descriptor will be closed after a successful
+execve; the call
+.Dq Li fcntl(d, F_SETFD, 0)
+restores the default,
+which is to not close the descriptor.
+.Sh RETURN VALUES
+.Rv -std close
+.Sh ERRORS
+The
+.Fn close
+system call will fail if:
+.Bl -tag -width Er
+.It Bq Er EBADF
+The
+.Fa d
+argument
+is not an active descriptor.
+.It Bq Er EINTR
+An interrupt was received.
+.It Bq Er ENOSPC
+The underlying object did not fit, cached data was lost.
+.It Bq Er ECONNRESET
+The underlying object was a stream socket that was shut down by the peer
+before all pending data was delivered.
+.El
+.Sh SEE ALSO
+.Xr accept 2 ,
+.Xr closefrom 2 ,
+.Xr execve 2 ,
+.Xr fcntl 2 ,
+.Xr flock 2 ,
+.Xr open 2 ,
+.Xr pipe 2 ,
+.Xr socket 2 ,
+.Xr socketpair 2
+.Sh STANDARDS
+The
+.Fn close
+system call is expected to conform to
+.St -p1003.1-90 .
+.Sh HISTORY
+The
+.Fn close
+function appeared in
+.At v7 .
diff --git a/lib/libc/sys/closefrom.2 b/lib/libc/sys/closefrom.2
new file mode 100644
index 0000000..ffaa001
--- /dev/null
+++ b/lib/libc/sys/closefrom.2
@@ -0,0 +1,53 @@
+.\" Copyright (c) 2009 Advanced Computing Technologies LLC
+.\" Written by: John H. Baldwin <jhb@FreeBSD.org>
+.\" All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd June 12, 2009
+.Dt CLOSEFROM 2
+.Os
+.Sh NAME
+.Nm closefrom
+.Nd delete open file descriptors
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In unistd.h
+.Ft void
+.Fn closefrom "int lowfd"
+.Sh DESCRIPTION
+The
+.Fn closefrom
+system call deletes all open file descriptors greater than or equal to
+.Fa lowfd
+from the per-process object reference table.
+Any errors encountered while closing file descriptors are ignored.
+.Sh SEE ALSO
+.Xr close 2
+.Sh HISTORY
+The
+.Fn closefrom
+function first appeared in
+.Fx 8.0 .
diff --git a/lib/libc/sys/connect.2 b/lib/libc/sys/connect.2
new file mode 100644
index 0000000..ac019e8
--- /dev/null
+++ b/lib/libc/sys/connect.2
@@ -0,0 +1,172 @@
+.\" Copyright (c) 1983, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"     @(#)connect.2	8.1 (Berkeley) 6/4/93
+.\" $FreeBSD$
+.\"
+.Dd September 5, 2010
+.Dt CONNECT 2
+.Os
+.Sh NAME
+.Nm connect
+.Nd initiate a connection on a socket
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In sys/types.h
+.In sys/socket.h
+.Ft int
+.Fn connect "int s" "const struct sockaddr *name" "socklen_t namelen"
+.Sh DESCRIPTION
+The
+.Fa s
+argument
+is a socket.
+If it is of type
+.Dv SOCK_DGRAM ,
+this call specifies the peer with which the socket is to be associated;
+this address is that to which datagrams are to be sent,
+and the only address from which datagrams are to be received.
+If the socket is of type
+.Dv SOCK_STREAM ,
+this call attempts to make a connection to
+another socket.
+The other socket is specified by
+.Fa name ,
+which is an address in the communications space of the socket.
+Each communications space interprets the
+.Fa name
+argument in its own way.
+Generally, stream sockets may successfully
+.Fn connect
+only once; datagram sockets may use
+.Fn connect
+multiple times to change their association.
+Datagram sockets may dissolve the association
+by connecting to an invalid address, such as a null address.
+.Sh RETURN VALUES
+.Rv -std connect
+.Sh ERRORS
+The
+.Fn connect
+system call fails if:
+.Bl -tag -width Er
+.It Bq Er EBADF
+The
+.Fa s
+argument
+is not a valid descriptor.
+.It Bq Er ENOTSOCK
+The
+.Fa s
+argument
+is a descriptor for a file, not a socket.
+.It Bq Er EADDRNOTAVAIL
+The specified address is not available on this machine.
+.It Bq Er EAFNOSUPPORT
+Addresses in the specified address family cannot be used with this socket.
+.It Bq Er EISCONN
+The socket is already connected.
+.It Bq Er ETIMEDOUT
+Connection establishment timed out without establishing a connection.
+.It Bq Er ECONNREFUSED
+The attempt to connect was forcefully rejected.
+.It Bq Er ECONNRESET
+The connection was reset by the remote host.
+.It Bq Er ENETUNREACH
+The network is not reachable from this host.
+.It Bq Er EHOSTUNREACH
+The remote host is not reachable from this host.
+.It Bq Er EADDRINUSE
+The address is already in use.
+.It Bq Er EFAULT
+The
+.Fa name
+argument specifies an area outside
+the process address space.
+.It Bq Er EINPROGRESS
+The socket is non-blocking
+and the connection cannot
+be completed immediately.
+It is possible to
+.Xr select 2
+for completion by selecting the socket for writing.
+.It Bq Er EINTR
+The connection attempt was interrupted by the delivery of a signal.
+The connection will be established in the background,
+as in the case of
+.Er EINPROGRESS .
+.It Bq Er EALREADY
+A previous connection attempt has not yet been completed.
+.It Bq Er EACCES
+An attempt is made to connect to a broadcast address (obtained through the
+.Dv INADDR_BROADCAST
+constant or the
+.Dv INADDR_NONE
+return value) through a socket that does not provide broadcast functionality.
+.It Bq Er EAGAIN
+An auto-assigned port number was requested but no auto-assigned ports
+are available.
+Increasing the port range specified by
+.Xr sysctl 3
+MIB variables
+.Va net.inet.ip.portrange.first
+and
+.Va net.inet.ip.portrange.last
+may alleviate the problem.
+.El
+.Pp
+The following errors are specific to connecting names in the UNIX domain.
+These errors may not apply in future versions of the UNIX IPC domain.
+.Bl -tag -width Er
+.It Bq Er ENOTDIR
+A component of the path prefix is not a directory.
+.It Bq Er ENAMETOOLONG
+A component of a pathname exceeded 255 characters,
+or an entire path name exceeded 1023 characters.
+.It Bq Er ENOENT
+The named socket does not exist.
+.It Bq Er EACCES
+Search permission is denied for a component of the path prefix.
+.It Bq Er EACCES
+Write access to the named socket is denied.
+.It Bq Er ELOOP
+Too many symbolic links were encountered in translating the pathname.
+.El
+.Sh SEE ALSO
+.Xr accept 2 ,
+.Xr getpeername 2 ,
+.Xr getsockname 2 ,
+.Xr select 2 ,
+.Xr socket 2 ,
+.Xr sysctl 3 ,
+.Xr sysctl 8
+.Sh HISTORY
+The
+.Fn connect
+system call appeared in
+.Bx 4.2 .
diff --git a/lib/libc/sys/cpuset.2 b/lib/libc/sys/cpuset.2
new file mode 100644
index 0000000..1cdff68
--- /dev/null
+++ b/lib/libc/sys/cpuset.2
@@ -0,0 +1,228 @@
+.\" Copyright (c) 2008 Christian Brueffer
+.\" Copyright (c) 2008 Jeffrey Roberson
+.\" All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd January 8, 2010
+.Dt CPUSET 2
+.Os
+.Sh NAME
+.Nm cpuset ,
+.Nm cpuset_getid ,
+.Nm cpuset_setid
+.Nd manage CPU affinity sets
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In sys/param.h
+.In sys/cpuset.h
+.Ft int
+.Fn cpuset "cpusetid_t *setid"
+.Ft int
+.Fn cpuset_setid "cpuwhich_t which" "id_t id" "cpusetid_t setid"
+.Ft int
+.Fn cpuset_getid "cpulevel_t level" "cpuwhich_t which" "id_t id" "cpusetid_t *setid"
+.Sh DESCRIPTION
+The
+.Nm
+family of system calls allow applications to control sets of processors and
+assign processes and threads to these sets.
+Processor sets contain lists of CPUs that members may run on and exist only
+as long as some process is a member of the set.
+All processes in the system have an assigned set.
+The default set for all processes in the system is the set numbered 1.
+Threads belong to the same set as the process which contains them,
+however, they may further restrict their set with the anonymous
+per-thread mask.
+.Pp
+Sets are referenced by a number of type
+.Ft cpuset_id_t .
+Each thread has a root set, an assigned set, and an anonymous mask.
+Only the root and assigned sets are numbered.
+The root set is the set of all CPUs available in the system or in the
+system partition the thread is running in.
+The assigned set is a subset of the root set and is administratively
+assignable on a per-process basis.
+Many processes and threads may be members of a numbered set.
+.Pp
+The anonymous set is a further thread-specific refinement on the assigned
+set.
+It is intended that administrators will manipulate numbered sets using
+.Xr cpuset 1
+while application developers will manipulate anonymous sets using
+.Xr cpuset_setaffinity 2 .
+.Pp
+To select the correct set a value of type
+.Ft cpulevel_t
+is used.
+The following values for 
+.Fa level
+are supported:
+.Bl -column CPU_LEVEL_CPUSET -offset indent
+.It Dv CPU_LEVEL_ROOT Ta "Root set"
+.It Dv CPU_LEVEL_CPUSET Ta "Assigned set"
+.It Dv CPU_LEVEL_WHICH Ta "Set specified by which argument"
+.El
+.Pp
+The
+.Fa which
+argument determines how the value of
+.Fa id
+is interpreted and is of type
+.Ft cpuwhich_t .
+The
+.Fa which
+argument may have the following values:
+.Bl -column CPU_WHICH_CPUSET -offset indent
+.It Dv CPU_WHICH_TID Ta "id is lwpid_t (thread id)"
+.It Dv CPU_WHICH_PID Ta "id is pid_t (process id)"
+.It Dv CPU_WHICH_CPUSET Ta "id is a cpusetid_t (cpuset id)"
+.It Dv CPU_WHICH_IRQ Ta "id is an irq number"
+.El
+.Pp
+An
+.Fa id
+of '-1' may be used with a
+.Fa which
+of
+.Dv CPU_WHICH_TID ,
+.Dv CPU_WHICH_PID ,
+or
+.Dv CPU_WHICH_CPUSET
+to mean the current thread, process, or current thread's
+cpuset.
+All cpuset syscalls allow this usage.
+.Pp
+A
+.Fa level
+argument of
+.Dv CPU_LEVEL_WHICH
+combined with a
+.Fa which
+argument other than
+.Dv CPU_WHICH_CPUSET
+refers to the anonymous mask of the object.
+This mask does not have an id and may only be manipulated with
+.Xr cpuset_setaffinity 2 .
+.Pp
+.Fn cpuset
+creates a new set containing the same CPUs as the root set of the current
+process and stores its id in the space provided by
+.Fa setid .
+On successful completion the calling process joins the set and is the
+only member.
+Children inherit this set after a call to
+.Xr fork 2 .
+.Pp
+.Fn cpuset_setid
+attempts to set the id of the object specified by the 
+.Fa which
+argument.
+Currently
+.Dv CPU_WHICH_PID
+is the only acceptable value for which as
+threads do not have an id distinct from their process and the API does
+not permit changing the id of an existing set.
+Upon successful completion all of the threads in the target process will
+be running on CPUs permitted by the set.
+.Pp
+.Fn cpuset_getid
+retrieves a set id from the object indicated by 
+.Fa which
+and stores it in the space pointed to by
+.Fa setid .
+The retrieved id may be that of either the root or assigned set
+depending on the value of 
+.Fa level .
+.Fa level
+should be
+.Dv CPU_LEVEL_CPUSET
+or
+.Dv CPU_LEVEL_ROOT
+to get the set id from
+the process or thread specified by the
+.Fa id
+argument.
+Specifying
+.Dv CPU_LEVEL_WHICH
+with a process or thread is unsupported since
+this references the unnumbered anonymous mask.
+.Pp
+The actual contents of the sets may be retrieved or manipulated using
+.Xr cpuset_getaffinity 2
+and
+.Xr cpuset_setaffinity 2 .
+See those manual pages for more detail.
+.Sh RETURN VALUES
+.Rv -std
+.Sh ERRORS
+The following error codes may be set in
+.Va errno :
+.Bl -tag -width Er
+.It Bq Er EINVAL
+The
+.Fa which
+or
+.Fa level
+argument was not a valid value.
+.It Bq Er EDEADLK
+The
+.Fn cpuset_setid
+call would leave a thread without a valid CPU to run on because the set
+does not overlap with the thread's anonymous mask.
+.It Bq Er EFAULT
+The setid pointer passed to
+.Fn cpuset_getid
+or
+.Fn cpuset
+was invalid.
+.It Bq Er ESRCH
+The object specified by the
+.Fa id
+and
+.Fa which
+arguments could not be found.
+.It Bq Er EPERM
+The calling process did not have the credentials required to complete the
+operation.
+.It Bq Er ENFILE
+There was no free
+.Ft cpusetid_t
+for allocation.
+.El
+.Sh SEE ALSO
+.Xr cpuset 1 ,
+.Xr cpuset_getaffinity 2 ,
+.Xr cpuset_setaffinity 2 ,
+.Xr CPU_SET 3 ,
+.Xr pthread_affinity_np 3 ,
+.Xr pthread_attr_affinity_np 3
+.Sh HISTORY
+The
+.Nm
+family of system calls first appeared in
+.Fx 7.1 .
+.Sh AUTHOR
+.An Jeffrey Roberson Aq jeff@FreeBSD.org
diff --git a/lib/libc/sys/cpuset_getaffinity.2 b/lib/libc/sys/cpuset_getaffinity.2
new file mode 100644
index 0000000..5c75b92
--- /dev/null
+++ b/lib/libc/sys/cpuset_getaffinity.2
@@ -0,0 +1,165 @@
+.\" Copyright (c) 2008 Christian Brueffer
+.\" Copyright (c) 2008 Jeffrey Roberson
+.\" All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd September 10, 2010
+.Dt CPUSET 2
+.Os
+.Sh NAME
+.Nm cpuset_getaffinity ,
+.Nm cpuset_setaffinity
+.Nd manage CPU affinity
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In sys/param.h
+.In sys/cpuset.h
+.Ft int
+.Fn cpuset_getaffinity "cpulevel_t level" "cpuwhich_t which" "id_t id" "size_t setsize" "cpuset_t *mask"
+.Ft int
+.Fn cpuset_setaffinity "cpulevel_t level" "cpuwhich_t which" "id_t id" "size_t setsize" "const cpuset_t *mask"
+.Sh DESCRIPTION
+.Fn cpuset_getaffinity
+and
+.Fn cpuset_setaffinity
+allow the manipulation of sets of CPUs available to processes, threads, 
+interrupts, jails and other resources.
+These functions may manipulate sets of CPUs that contain many processes
+or per-object anonymous masks that effect only a single object.
+.Pp
+The valid values for the
+.Fa level
+and
+.Fa which
+arguments are documented in
+.Xr cpuset 2 .
+These arguments specify which object and which set of the object we are
+referring to.
+Not all possible combinations are valid.
+For example, only processes may belong to a numbered set accessed by a
+.Fa level
+argument of
+.Dv CPU_LEVEL_CPUSET .
+All resources, however, have a mask which may be manipulated with
+.Dv CPU_LEVEL_WHICH .
+.Pp
+Masks of type
+.Ft cpuset_t
+are composed using the
+.Xr CPU_SET 2
+macros.
+The kernel tolerates large sets as long as all CPUs specified
+in the set exist.
+Sets smaller than the kernel uses generate an error on calls to
+.Fn cpuset_getaffinity
+even if the result set would fit within the user supplied set.
+Calls to
+.Fn cpuset_setaffinity
+tolerate small sets with no restrictions.
+.Pp
+The supplied mask should have a size of
+.Fa setsize
+bytes.
+This size is usually provided by calling
+.Li sizeof(mask)
+which is ultimately determined by the value of
+.Dv CPU_SETSIZE
+as defined in
+.In sys/cpuset.h .
+.Pp
+.Fn cpuset_getaffinity
+retrieves the
+mask from the object specified by
+.Fa level ,
+.Fa which
+and
+.Fa id
+and stores it in the space provided by
+.Fa mask .
+.Pp
+.Fn cpuset_setaffinity
+attempts to set the mask for the object specified by
+.Fa level ,
+.Fa which
+and
+.Fa id
+to the value in
+.Fa mask .
+.Pp
+.Sh RETURN VALUES
+.Rv -std
+.Sh ERRORS
+The following error codes may be set in
+.Va errno :
+.Bl -tag -width Er
+.It Bq Er EINVAL
+The
+.Fa level
+or
+.Fa which
+argument was not a valid value.
+.It Bq Er EINVAL
+The
+.Fa mask
+argument specified when calling
+.Fn cpuset_setaffinity
+was not a valid value.
+.It Bq Er EDEADLK
+The
+.Fn cpuset_setaffinity
+call would leave a thread without a valid CPU to run on because the set
+does not overlap with the thread's anonymous mask.
+.It Bq Er EFAULT
+The mask pointer passed was invalid.
+.It Bq Er ESRCH
+The object specified by the
+.Fa id
+and
+.Fa which
+arguments could not be found.
+.It Bq Er ERANGE
+The
+.Fa cpusetsize
+was either preposterously large or smaller than the kernel set size.
+.It Bq Er EPERM
+The calling process did not have the credentials required to complete the
+operation.
+.El
+.Sh SEE ALSO
+.Xr cpuset 1 ,
+.Xr cpuset 2 ,
+.Xr cpuset_getid 2 ,
+.Xr cpuset_setid 2 ,
+.Xr CPU_SET 3 ,
+.Xr pthread_affinity_np 3 ,
+.Xr pthread_attr_affinity_np 3
+.Sh HISTORY
+The
+.Nm
+family of system calls first appeared in
+.Fx 7.1 .
+.Sh AUTHOR
+.An Jeffrey Roberson Aq jeff@FreeBSD.org
diff --git a/lib/libc/sys/dup.2 b/lib/libc/sys/dup.2
new file mode 100644
index 0000000..c87b386
--- /dev/null
+++ b/lib/libc/sys/dup.2
@@ -0,0 +1,162 @@
+.\" Copyright (c) 1980, 1991, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"     @(#)dup.2	8.1 (Berkeley) 6/4/93
+.\" $FreeBSD$
+.\"
+.Dd June 4, 1993
+.Dt DUP 2
+.Os
+.Sh NAME
+.Nm dup ,
+.Nm dup2
+.Nd duplicate an existing file descriptor
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In unistd.h
+.Ft int
+.Fn dup "int oldd"
+.Ft int
+.Fn dup2 "int oldd" "int newd"
+.Sh DESCRIPTION
+The
+.Fn dup
+system call
+duplicates an existing object descriptor and returns its value to
+the calling process
+.Fa ( newd
+=
+.Fn dup oldd ) .
+The argument
+.Fa oldd
+is a small non-negative integer index in
+the per-process descriptor table.
+The value must be less
+than the size of the table, which is returned by
+.Xr getdtablesize 2 .
+The new descriptor returned by the call
+is the lowest numbered descriptor
+currently not in use by the process.
+.Pp
+The object referenced by the descriptor does not distinguish
+between
+.Fa oldd
+and
+.Fa newd
+in any way.
+Thus if
+.Fa newd
+and
+.Fa oldd
+are duplicate references to an open
+file,
+.Xr read 2 ,
+.Xr write 2
+and
+.Xr lseek 2
+calls all move a single pointer into the file,
+and append mode, non-blocking I/O and asynchronous I/O options
+are shared between the references.
+If a separate pointer into the file is desired, a different
+object reference to the file must be obtained by issuing an
+additional
+.Xr open 2
+system call.
+The close-on-exec flag on the new file descriptor is unset.
+.Pp
+In
+.Fn dup2 ,
+the value of the new descriptor
+.Fa newd
+is specified.
+If this descriptor is already in use and
+.Fa oldd
+\*(Ne
+.Fa newd ,
+the descriptor is first deallocated as if the
+.Xr close 2
+system call had been used.
+If
+.Fa oldd
+is not a valid descriptor, then
+.Fa newd
+is not closed.
+If
+.Fa oldd
+==
+.Fa newd
+and
+.Fa oldd
+is a valid descriptor, then
+.Fn dup2
+is successful, and does nothing.
+.Sh RETURN VALUES
+The value -1 is returned if an error occurs in either call.
+The external variable
+.Va errno
+indicates the cause of the error.
+.Sh ERRORS
+The
+.Fn dup
+and
+.Fn dup2
+system calls fail if:
+.Bl -tag -width Er
+.It Bq Er EBADF
+The
+.Fa oldd
+or
+.Fa newd
+argument
+is not a valid active descriptor
+.It Bq Er EMFILE
+Too many descriptors are active.
+.El
+.Sh SEE ALSO
+.Xr accept 2 ,
+.Xr close 2 ,
+.Xr fcntl 2 ,
+.Xr getdtablesize 2 ,
+.Xr open 2 ,
+.Xr pipe 2 ,
+.Xr socket 2 ,
+.Xr socketpair 2
+.Sh STANDARDS
+The
+.Fn dup
+and
+.Fn dup2
+system calls are expected to conform to
+.St -p1003.1-90 .
+.Sh HISTORY
+The
+.Fn dup
+and
+.Fn dup2
+functions appeared in
+.At v7 .
diff --git a/lib/libc/sys/execve.2 b/lib/libc/sys/execve.2
new file mode 100644
index 0000000..991495c
--- /dev/null
+++ b/lib/libc/sys/execve.2
@@ -0,0 +1,377 @@
+.\" Copyright (c) 1980, 1991, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"     @(#)execve.2	8.5 (Berkeley) 6/1/94
+.\" $FreeBSD$
+.\"
+.Dd September 21, 2010
+.Dt EXECVE 2
+.Os
+.Sh NAME
+.Nm execve ,
+.Nm fexecve
+.Nd execute a file
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In unistd.h
+.Ft int
+.Fn execve "const char *path" "char *const argv[]" "char *const envp[]"
+.Ft int
+.Fn fexecve "int fd" "char *const argv[]" "char *const envp[]"
+.Sh DESCRIPTION
+The
+.Fn execve
+system call
+transforms the calling process into a new process.
+The new process is constructed from an ordinary file,
+whose name is pointed to by
+.Fa path ,
+called the
+.Em new process file .
+The
+.Fn fexecve
+system call is equivalent to
+.Fn execve
+except that the file to be executed is determined by the file
+descriptor
+.Fa fd
+instead of a
+.Fa path .
+This file is either an executable object file,
+or a file of data for an interpreter.
+An executable object file consists of an identifying header,
+followed by pages of data representing the initial program (text)
+and initialized data pages.
+Additional pages may be specified
+by the header to be initialized with zero data; see
+.Xr elf 5
+and
+.Xr a.out 5 .
+.Pp
+An interpreter file begins with a line of the form:
+.Pp
+.Bd -ragged -offset indent -compact
+.Sy \&#!
+.Em interpreter
+.Bq Em arg
+.Ed
+.Pp
+When an interpreter file is
+.Sy execve Ap d ,
+the system actually
+.Sy execve Ap s
+the specified
+.Em interpreter .
+If the optional
+.Em arg
+is specified, it becomes the first argument to the
+.Em interpreter ,
+and the name of the originally
+.Sy execve Ap d
+file becomes the second argument;
+otherwise, the name of the originally
+.Sy execve Ap d
+file becomes the first argument.
+The original arguments are shifted over to
+become the subsequent arguments.
+The zeroth argument is set to the specified
+.Em interpreter .
+.Pp
+The argument
+.Fa argv
+is a pointer to a null-terminated array of
+character pointers to null-terminated character strings.
+These strings construct the argument list to be made available to the new
+process.
+At least one argument must be present in
+the array; by custom, the first element should be
+the name of the executed program (for example, the last component of
+.Fa path ) .
+.Pp
+The argument
+.Fa envp
+is also a pointer to a null-terminated array of
+character pointers to null-terminated strings.
+A pointer to this array is normally stored in the global variable
+.Va environ .
+These strings pass information to the
+new process that is not directly an argument to the command (see
+.Xr environ 7 ) .
+.Pp
+File descriptors open in the calling process image remain open in
+the new process image, except for those for which the close-on-exec
+flag is set (see
+.Xr close 2
+and
+.Xr fcntl 2 ) .
+Descriptors that remain open are unaffected by
+.Fn execve .
+If any of the standard descriptors (0, 1, and/or 2) are closed at the
+time
+.Fn execve
+is called, and the process will gain privilege as a result of set-id
+semantics, those descriptors will be re-opened automatically.
+No programs, whether privileged or not, should assume that these descriptors
+will remain closed across a call to
+.Fn execve .
+.Pp
+Signals set to be ignored in the calling process are set to be ignored in
+the
+new process.
+Signals which are set to be caught in the calling process image
+are set to default action in the new process image.
+Blocked signals remain blocked regardless of changes to the signal action.
+The signal stack is reset to be undefined (see
+.Xr sigaction 2
+for more information).
+.Pp
+If the set-user-ID mode bit of the new process image file is set
+(see
+.Xr chmod 2 ) ,
+the effective user ID of the new process image is set to the owner ID
+of the new process image file.
+If the set-group-ID mode bit of the new process image file is set,
+the effective group ID of the new process image is set to the group ID
+of the new process image file.
+(The effective group ID is the first element of the group list.)
+The real user ID, real group ID and
+other group IDs of the new process image remain the same as the calling
+process image.
+After any set-user-ID and set-group-ID processing,
+the effective user ID is recorded as the saved set-user-ID,
+and the effective group ID is recorded as the saved set-group-ID.
+These values may be used in changing the effective IDs later (see
+.Xr setuid 2 ) .
+.Pp
+The set-ID bits are not honored if the respective file system has the
+.Cm nosuid
+option enabled or if the new process file is an interpreter file.
+Syscall
+tracing is disabled if effective IDs are changed.
+.Pp
+The new process also inherits the following attributes from
+the calling process:
+.Pp
+.Bl -column parent_process_ID -offset indent -compact
+.It process ID Ta see Xr getpid 2
+.It parent process ID Ta see Xr getppid 2
+.It process group ID Ta see Xr getpgrp 2
+.It access groups Ta see Xr getgroups 2
+.It working directory Ta see Xr chdir 2
+.It root directory Ta see Xr chroot 2
+.It control terminal Ta see Xr termios 4
+.It resource usages Ta see Xr getrusage 2
+.It interval timers Ta see Xr getitimer 2
+.It resource limits Ta see Xr getrlimit 2
+.It file mode mask Ta see Xr umask 2
+.It signal mask Ta see Xr sigaction 2 ,
+.Xr sigprocmask 2
+.El
+.Pp
+When a program is executed as a result of an
+.Fn execve
+system call, it is entered as follows:
+.Bd -literal -offset indent
+main(argc, argv, envp)
+int argc;
+char **argv, **envp;
+.Ed
+.Pp
+where
+.Fa argc
+is the number of elements in
+.Fa argv
+(the ``arg count'')
+and
+.Fa argv
+points to the array of character pointers
+to the arguments themselves.
+.Pp
+The
+.Fn fexecve
+ignores the file offset of
+.Fa fd .
+Since execute permission is checked by
+.Fn fexecve ,
+the file descriptor
+.Fa fd
+need not have been opened with the
+.Dv O_EXEC
+flag.
+However, if the file to be executed denies read permission for the process
+preparing to do the exec, the only way to provide the
+.Fa fd
+to
+.Fn fexecve
+is to use the
+.Dv O_EXEC
+flag when opening
+.Fa fd .
+Note that the file to be executed can not be open for writing.
+.Sh RETURN VALUES
+As the
+.Fn execve
+system call overlays the current process image
+with a new process image the successful call
+has no process to return to.
+If
+.Fn execve
+does return to the calling process an error has occurred; the
+return value will be -1 and the global variable
+.Va errno
+is set to indicate the error.
+.Sh ERRORS
+The
+.Fn execve
+system call
+will fail and return to the calling process if:
+.Bl -tag -width Er
+.It Bq Er ENOTDIR
+A component of the path prefix is not a directory.
+.It Bq Er ENAMETOOLONG
+A component of a pathname exceeded 255 characters,
+or an entire path name exceeded 1023 characters.
+.It Bq Er ENOEXEC
+When invoking an interpreted script, the length of the first line,
+inclusive of the
+.Sy \&#!
+prefix and terminating newline, exceeds
+.Dv MAXSHELLCMDLEN
+characters.
+.It Bq Er ENOENT
+The new process file does not exist.
+.It Bq Er ELOOP
+Too many symbolic links were encountered in translating the pathname.
+.It Bq Er EACCES
+Search permission is denied for a component of the path prefix.
+.It Bq Er EACCES
+The new process file is not an ordinary file.
+.It Bq Er EACCES
+The new process file mode denies execute permission.
+.It Bq Er ENOEXEC
+The new process file has the appropriate access
+permission, but has an invalid magic number in its header.
+.It Bq Er ETXTBSY
+The new process file is a pure procedure (shared text)
+file that is currently open for writing by some process.
+.It Bq Er ENOMEM
+The new process requires more virtual memory than
+is allowed by the imposed maximum
+.Pq Xr getrlimit 2 .
+.It Bq Er E2BIG
+The number of bytes in the new process' argument list
+is larger than the system-imposed limit.
+This limit is specified by the
+.Xr sysctl 3
+MIB variable
+.Dv KERN_ARGMAX .
+.It Bq Er EFAULT
+The new process file is not as long as indicated by
+the size values in its header.
+.It Bq Er EFAULT
+The
+.Fa path ,
+.Fa argv ,
+or
+.Fa envp
+arguments
+point
+to an illegal address.
+.It Bq Er EIO
+An I/O error occurred while reading from the file system.
+.El
+.Pp
+In addition, the
+.Fn fexecve
+will fail and return to the calling process if:
+.Bl -tag -width Er
+.It Bq Er EBADF
+The
+.Fa fd
+argument is not a valid file descriptor open for executing.
+.El
+.Sh SEE ALSO
+.Xr ktrace 1 ,
+.Xr _exit 2 ,
+.Xr fork 2 ,
+.Xr open 2 ,
+.Xr execl 3 ,
+.Xr exit 3 ,
+.Xr sysctl 3 ,
+.Xr a.out 5 ,
+.Xr elf 5 ,
+.Xr fdescfs 5 ,
+.Xr environ 7 ,
+.Xr mount 8
+.Sh STANDARDS
+The
+.Fn execve
+system call conforms to
+.St -p1003.1-2001 ,
+with the exception of reopening descriptors 0, 1, and/or 2 in certain
+circumstances.
+A future update of the Standard is expected to require this behavior,
+and it may become the default for non-privileged processes as well.
+.\" NB: update this caveat when TC1 is blessed.
+The support for executing interpreted programs is an extension.
+The
+.Fn fexecve
+system call conforms to The Open Group Extended API Set 2 specification.
+.Sh HISTORY
+The
+.Fn execve
+system call appeared in
+.Bx 4.2 .
+The
+.Fn fexecve
+system call appeared in
+.Fx 8.0 .
+.Sh CAVEATS
+If a program is
+.Em setuid
+to a non-super-user, but is executed when
+the real
+.Em uid
+is ``root'', then the program has some of the powers
+of a super-user as well.
+.Pp
+When executing an interpreted program through
+.Fn fexecve ,
+kernel supplies
+.Pa /dev/fd/n
+as a second argument to the interpreter,
+where
+.Ar n
+is the file descriptor passed in the
+.Fa fd
+argument to
+.Fn fexecve .
+For this construction to work correctly, the
+.Xr fdescfs 5
+filesystem shall be mounted on
+.Pa /dev/fd .
diff --git a/lib/libc/sys/extattr_get_file.2 b/lib/libc/sys/extattr_get_file.2
new file mode 100644
index 0000000..e8faa13
--- /dev/null
+++ b/lib/libc/sys/extattr_get_file.2
@@ -0,0 +1,276 @@
+.\"
+.\" Copyright (c) 2001 Dima Dorfman <dima@unixfreak.org>
+.\" Copyright (c) 2003 Robert Watson <rwatson@FreeBSD.org>
+.\" All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd January 29, 2008
+.Dt EXTATTR 2
+.Os
+.Sh NAME
+.Nm extattr_get_fd ,
+.Nm extattr_set_fd ,
+.Nm extattr_delete_fd ,
+.Nm extattr_list_fd ,
+.Nm extattr_get_file ,
+.Nm extattr_set_file ,
+.Nm extattr_delete_file ,
+.Nm extattr_list_file ,
+.Nm extattr_get_link ,
+.Nm extattr_set_link ,
+.Nm extattr_delete_link ,
+.Nm extattr_list_link
+.Nd system calls to manipulate VFS extended attributes
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In sys/types.h
+.In sys/extattr.h
+.Ft ssize_t
+.Fn extattr_get_fd "int fd" "int attrnamespace" "const char *attrname" "void *data" "size_t nbytes"
+.Ft int
+.Fn extattr_set_fd "int fd" "int attrnamespace" "const char *attrname" "const void *data" "size_t nbytes"
+.Ft int
+.Fn extattr_delete_fd "int fd" "int attrnamespace" "const char *attrname"
+.Ft ssize_t
+.Fn extattr_list_fd "int fd" "int attrnamespace" "void *data" "size_t nbytes"
+.Ft ssize_t
+.Fn extattr_get_file "const char *path" "int attrnamespace" "const char *attrname" "void *data" "size_t nbytes"
+.Ft int
+.Fn extattr_set_file "const char *path" "int attrnamespace" "const char *attrname" "const void *data" "size_t nbytes"
+.Ft int
+.Fn extattr_delete_file "const char *path" "int attrnamespace" "const char *attrname"
+.Ft ssize_t
+.Fn extattr_list_file "const char *path" "int attrnamespace" "void *data" "size_t nbytes"
+.Ft ssize_t
+.Fn extattr_get_link "const char *path" "int attrnamespace" "const char *attrname" "void *data" "size_t nbytes"
+.Ft int
+.Fn extattr_set_link "const char *path" "int attrnamespace" "const char *attrname" "const void *data" "size_t nbytes"
+.Ft int
+.Fn extattr_delete_link "const char *path" "int attrnamespace" "const char *attrname"
+.Ft ssize_t
+.Fn extattr_list_link "const char *path" "int attrnamespace" "void *data" "size_t nbytes"
+.Sh DESCRIPTION
+Named extended attributes are meta-data associated with vnodes
+representing files and directories.
+They exist as
+.Qq Li name=value
+pairs within a set of namespaces.
+.Pp
+The
+.Fn extattr_get_file
+system call retrieves the value of the specified extended attribute into
+a buffer pointed to by
+.Fa data
+of size
+.Fa nbytes .
+The
+.Fn extattr_set_file
+system call sets the value of the specified extended attribute to the data
+described by
+.Fa data .
+The
+.Fn extattr_delete_file
+system call deletes the extended attribute specified.
+The
+.Fn extattr_list_file
+returns a list of attributes present in the requested namespace.
+Each list entry consists of a single byte containing the length
+of the attribute name, followed by the attribute name.
+The attribute name is not terminated by ASCII 0 (nul).
+The
+.Fn extattr_get_file ,
+and
+.Fn extattr_list_file
+calls consume the
+.Fa data
+and
+.Fa nbytes
+arguments in the style of
+.Xr read 2 ;
+.Fn extattr_set_file
+consumes these arguments in the style of
+.Xr write 2 .
+.Pp
+If
+.Fa data
+is
+.Dv NULL
+in a call to
+.Fn extattr_get_file
+and
+.Fn extattr_list_file
+then the size of defined extended attribute data will be returned, rather
+than the quantity read, permitting applications to test the size of the
+data without performing a read.
+The
+.Fn extattr_delete_link ,
+.Fn extattr_get_link ,
+and
+.Fn extattr_set_link
+system calls behave in the same way as their _file counterparts, except that
+they do not follow symlinks.
+.Pp
+The
+.Fn extattr_get_fd ,
+.Fn extattr_set_fd ,
+.Fn extattr_delete_fd ,
+and
+.Fn extattr_list_fd ,
+calls are identical to their
+.Qq Li _file
+counterparts except for the first argument.
+The
+.Qq Li _fd
+functions take a file descriptor, while the
+.Qq Li _file
+functions take a path.
+Both arguments describe a file associated with the extended attribute
+that should be manipulated.
+.Pp
+The following arguments are common to all the system calls described here:
+.Bl -tag -width attrnamespace
+.It Fa attrnamespace
+the namespace in which the extended attribute resides; see
+.Xr extattr 9
+.It Fa attrname
+the name of the extended attribute
+.El
+.Pp
+Named extended attribute semantics vary by file system implementing the call.
+Not all operations may be supported for a particular attribute.
+Additionally, the format of the data in
+.Fa data
+is attribute-specific.
+.Pp
+For more information on named extended attributes, please see
+.Xr extattr 9 .
+.Sh CAVEAT
+This interface is under active development, and as such is subject to
+change as applications are adapted to use it.
+Developers are discouraged from relying on its stability.
+.Sh RETURN VALUES
+If successful, the
+.Fn extattr_get_file ,
+.Fn extattr_set_file ,
+and
+.Fn extattr_list_file
+calls return the number of bytes
+that were read or written from the
+.Fa data ,
+respectively, or if
+.Fa data
+was
+.Dv NULL ,
+then
+.Fn extattr_get_file
+and
+.Fn extattr_list_file
+return the number of bytes available to read.
+If any of the calls are unsuccessful, the value \-1 is returned
+and the global variable
+.Va errno
+is set to indicate the error.
+.Pp
+.Rv -std extattr_delete_file
+.Sh ERRORS
+The following errors may be returned by the system calls themselves.
+Additionally, the file system implementing the call may return any
+other errors it desires.
+.Bl -tag -width Er
+.It Bq Er EFAULT
+The
+.Fa attrnamespace
+and
+.Fa attrname
+arguments,
+or the memory range defined by
+.Fa data
+and
+.Fa nbytes
+point outside the process's allocated address space.
+.It Bq Er ENAMETOOLONG
+The attribute name was longer than
+.Dv EXTATTR_MAXNAMELEN .
+.El
+.Pp
+The
+.Fn extattr_get_fd ,
+.Fn extattr_set_fd ,
+.Fn extattr_delete_fd ,
+and
+.Fn extattr_list_fd
+system calls may also fail if:
+.Bl -tag -width Er
+.It Bq Er EBADF
+The file descriptor referenced by
+.Fa fd
+was invalid.
+.El
+.Pp
+Additionally, the
+.Fn extattr_get_file ,
+.Fn extattr_set_file ,
+and
+.Fn extattr_delete_file
+calls may also fail due to the following errors:
+.Bl -tag -width Er
+.It Bq Er ENOATTR
+The requested attribute was not defined for this file.
+.It Bq Er ENOTDIR
+A component of the path prefix is not a directory.
+.It Bq Er ENAMETOOLONG
+A component of a pathname exceeded 255 characters,
+or an entire path name exceeded 1023 characters.
+.It Bq Er ENOENT
+A component of the path name that must exist does not exist.
+.It Bq Er EACCES
+Search permission is denied for a component of the path prefix.
+.\" XXX are any missing?
+.El
+.Sh SEE ALSO
+.Xr extattr 3 ,
+.Xr getextattr 8 ,
+.Xr setextattr 8 ,
+.Xr extattr 9 ,
+.Xr VOP_GETEXTATTR 9 ,
+.Xr VOP_SETEXTATTR 9
+.Sh HISTORY
+Extended attribute support was developed as part of the
+.Tn TrustedBSD
+Project, and introduced in
+.Fx 5.0 .
+It was developed to support security extensions requiring additional labels
+to be associated with each file or directory.
+.Sh BUGS
+In earlier versions of this API, passing an empty string for the
+attribute name to
+.Fn extattr_get_fd ,
+.Fn extattr_get_file ,
+or
+.Fn extattr_get_link
+would return the list of attributes defined for the target object.
+This interface has been deprecated in preference to using the explicit
+list API, and should not be used.
diff --git a/lib/libc/sys/fcntl.2 b/lib/libc/sys/fcntl.2
new file mode 100644
index 0000000..a801b60
--- /dev/null
+++ b/lib/libc/sys/fcntl.2
@@ -0,0 +1,639 @@
+.\" Copyright (c) 1983, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"     @(#)fcntl.2	8.2 (Berkeley) 1/12/94
+.\" $FreeBSD$
+.\"
+.Dd September 28, 2009
+.Dt FCNTL 2
+.Os
+.Sh NAME
+.Nm fcntl
+.Nd file control
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In fcntl.h
+.Ft int
+.Fn fcntl "int fd" "int cmd" "..."
+.Sh DESCRIPTION
+The
+.Fn fcntl
+system call provides for control over descriptors.
+The argument
+.Fa fd
+is a descriptor to be operated on by
+.Fa cmd
+as described below.
+Depending on the value of
+.Fa cmd ,
+.Fn fcntl
+can take an additional third argument
+.Fa "int arg" .
+.Bl -tag -width F_GETOWNX
+.It Dv F_DUPFD
+Return a new descriptor as follows:
+.Pp
+.Bl -bullet -compact -offset 4n
+.It
+Lowest numbered available descriptor greater than or equal to
+.Fa arg .
+.It
+Same object references as the original descriptor.
+.It
+New descriptor shares the same file offset if the object
+was a file.
+.It
+Same access mode (read, write or read/write).
+.It
+Same file status flags (i.e., both file descriptors
+share the same file status flags).
+.It
+The close-on-exec flag associated with the new file descriptor
+is set to remain open across
+.Xr execve 2
+system calls.
+.El
+.It Dv F_DUP2FD
+It is functionally equivalent to
+.Bd -literal -offset indent
+dup2(fd, arg)
+.Ed
+.Pp
+The
+.Dv F_DUP2FD
+constant is not portable, so it should not be used if portability is needed.
+Use
+.Fn dup2
+instead.
+.It Dv F_GETFD
+Get the close-on-exec flag associated with the file descriptor
+.Fa fd
+as
+.Dv FD_CLOEXEC .
+If the returned value ANDed with
+.Dv FD_CLOEXEC
+is 0,
+the file will remain open across
+.Fn exec ,
+otherwise the file will be closed upon execution of
+.Fn exec
+.Fa ( arg
+is ignored).
+.It Dv F_SETFD
+Set the close-on-exec flag associated with
+.Fa fd
+to
+.Fa arg ,
+where
+.Fa arg
+is either 0 or
+.Dv FD_CLOEXEC ,
+as described above.
+.It Dv F_GETFL
+Get descriptor status flags, as described below
+.Fa ( arg
+is ignored).
+.It Dv F_SETFL
+Set descriptor status flags to
+.Fa arg .
+.It Dv F_GETOWN
+Get the process ID or process group
+currently receiving
+.Dv SIGIO
+and
+.Dv SIGURG
+signals; process groups are returned
+as negative values
+.Fa ( arg
+is ignored).
+.It Dv F_SETOWN
+Set the process or process group
+to receive
+.Dv SIGIO
+and
+.Dv SIGURG
+signals;
+process groups are specified by supplying
+.Fa arg
+as negative, otherwise
+.Fa arg
+is interpreted as a process ID.
+.El
+.Pp
+The flags for the
+.Dv F_GETFL
+and
+.Dv F_SETFL
+flags are as follows:
+.Bl -tag -width O_NONBLOCKX
+.It Dv O_NONBLOCK
+Non-blocking I/O; if no data is available to a
+.Xr read 2
+system call, or if a
+.Xr write 2
+operation would block,
+the read or write call returns -1 with the error
+.Er EAGAIN .
+.It Dv O_APPEND
+Force each write to append at the end of file;
+corresponds to the
+.Dv O_APPEND
+flag of
+.Xr open 2 .
+.It Dv O_DIRECT
+Minimize or eliminate the cache effects of reading and writing.
+The system
+will attempt to avoid caching the data you read or write.
+If it cannot
+avoid caching the data, it will minimize the impact the data has on the cache.
+Use of this flag can drastically reduce performance if not used with care.
+.It Dv O_ASYNC
+Enable the
+.Dv SIGIO
+signal to be sent to the process group
+when I/O is possible, e.g.,
+upon availability of data to be read.
+.El
+.Pp
+Several commands are available for doing advisory file locking;
+they all operate on the following structure:
+.Bd -literal
+struct flock {
+	off_t	l_start;	/* starting offset */
+	off_t	l_len;		/* len = 0 means until end of file */
+	pid_t	l_pid;		/* lock owner */
+	short	l_type;		/* lock type: read/write, etc. */
+	short	l_whence;	/* type of l_start */
+	int	l_sysid;	/* remote system id or zero for local */
+};
+.Ed
+The commands available for advisory record locking are as follows:
+.Bl -tag -width F_SETLKWX
+.It Dv F_GETLK
+Get the first lock that blocks the lock description pointed to by the
+third argument,
+.Fa arg ,
+taken as a pointer to a
+.Fa "struct flock"
+(see above).
+The information retrieved overwrites the information passed to
+.Fn fcntl
+in the
+.Fa flock
+structure.
+If no lock is found that would prevent this lock from being created,
+the structure is left unchanged by this system call except for the
+lock type which is set to
+.Dv F_UNLCK .
+.It Dv F_SETLK
+Set or clear a file segment lock according to the lock description
+pointed to by the third argument,
+.Fa arg ,
+taken as a pointer to a
+.Fa "struct flock"
+(see above).
+.Dv F_SETLK
+is used to establish shared (or read) locks
+.Pq Dv F_RDLCK
+or exclusive (or write) locks,
+.Pq Dv F_WRLCK ,
+as well as remove either type of lock
+.Pq Dv F_UNLCK .
+If a shared or exclusive lock cannot be set,
+.Fn fcntl
+returns immediately with
+.Er EAGAIN .
+.It Dv F_SETLKW
+This command is the same as
+.Dv F_SETLK
+except that if a shared or exclusive lock is blocked by other locks,
+the process waits until the request can be satisfied.
+If a signal that is to be caught is received while
+.Fn fcntl
+is waiting for a region, the
+.Fn fcntl
+will be interrupted if the signal handler has not specified the
+.Dv SA_RESTART
+(see
+.Xr sigaction 2 ) .
+.It Dv F_READAHEAD
+Set or clear the read ahead amount for sequential access to the third
+argument,
+.Fa arg ,
+which is rounded up to the nearest block size.
+A zero value in
+.Fa arg
+turns off read ahead.
+.It Dv F_RDAHEAD
+Equivalent to Darwin counterpart which sets read ahead amount of 128KB
+when the third argument,
+.Fa arg
+is non-zero.
+A zero value in
+.Fa arg
+turns off read ahead.
+.El
+.Pp
+When a shared lock has been set on a segment of a file,
+other processes can set shared locks on that segment
+or a portion of it.
+A shared lock prevents any other process from setting an exclusive
+lock on any portion of the protected area.
+A request for a shared lock fails if the file descriptor was not
+opened with read access.
+.Pp
+An exclusive lock prevents any other process from setting a shared lock or
+an exclusive lock on any portion of the protected area.
+A request for an exclusive lock fails if the file was not
+opened with write access.
+.Pp
+The value of
+.Fa l_whence
+is
+.Dv SEEK_SET ,
+.Dv SEEK_CUR ,
+or
+.Dv SEEK_END
+to indicate that the relative offset,
+.Fa l_start
+bytes, will be measured from the start of the file,
+current position, or end of the file, respectively.
+The value of
+.Fa l_len
+is the number of consecutive bytes to be locked.
+If
+.Fa l_len
+is negative,
+.Fa l_start
+means end edge of the region.
+The
+.Fa l_pid
+and
+.Fa l_sysid
+fields are only used with
+.Dv F_GETLK
+to return the process ID of the process holding a blocking lock and
+the system ID of the system that owns that process.
+Locks created by the local system will have a system ID of zero.
+After a successful
+.Dv F_GETLK
+request, the value of
+.Fa l_whence
+is
+.Dv SEEK_SET .
+.Pp
+Locks may start and extend beyond the current end of a file,
+but may not start or extend before the beginning of the file.
+A lock is set to extend to the largest possible value of the
+file offset for that file if
+.Fa l_len
+is set to zero.
+If
+.Fa l_whence
+and
+.Fa l_start
+point to the beginning of the file, and
+.Fa l_len
+is zero, the entire file is locked.
+If an application wishes only to do entire file locking, the
+.Xr flock 2
+system call is much more efficient.
+.Pp
+There is at most one type of lock set for each byte in the file.
+Before a successful return from an
+.Dv F_SETLK
+or an
+.Dv F_SETLKW
+request when the calling process has previously existing locks
+on bytes in the region specified by the request,
+the previous lock type for each byte in the specified
+region is replaced by the new lock type.
+As specified above under the descriptions
+of shared locks and exclusive locks, an
+.Dv F_SETLK
+or an
+.Dv F_SETLKW
+request fails or blocks respectively when another process has existing
+locks on bytes in the specified region and the type of any of those
+locks conflicts with the type specified in the request.
+.Pp
+This interface follows the completely stupid semantics of System V and
+.St -p1003.1-88
+that require that all locks associated with a file for a given process are
+removed when
+.Em any
+file descriptor for that file is closed by that process.
+This semantic means that applications must be aware of any files that
+a subroutine library may access.
+For example if an application for updating the password file locks the
+password file database while making the update, and then calls
+.Xr getpwnam 3
+to retrieve a record,
+the lock will be lost because
+.Xr getpwnam 3
+opens, reads, and closes the password database.
+The database close will release all locks that the process has
+associated with the database, even if the library routine never
+requested a lock on the database.
+Another minor semantic problem with this interface is that
+locks are not inherited by a child process created using the
+.Xr fork 2
+system call.
+The
+.Xr flock 2
+interface has much more rational last close semantics and
+allows locks to be inherited by child processes.
+The
+.Xr flock 2
+system call is recommended for applications that want to ensure the integrity
+of their locks when using library routines or wish to pass locks
+to their children.
+.Pp
+The
+.Fn fcntl ,
+.Xr flock 2 ,
+and
+.Xr lockf 3
+locks are compatible.
+Processes using different locking interfaces can cooperate
+over the same file safely.
+However, only one of such interfaces should be used within
+the same process.
+If a file is locked by a process through
+.Xr flock 2 ,
+any record within the file will be seen as locked
+from the viewpoint of another process using
+.Fn fcntl
+or
+.Xr lockf 3 ,
+and vice versa.
+Note that
+.Fn fcntl F_GETLK
+returns \-1 in
+.Fa l_pid
+if the process holding a blocking lock previously locked the
+file descriptor by
+.Xr flock 2 .
+.Pp
+All locks associated with a file for a given process are
+removed when the process terminates.
+.Pp
+All locks obtained before a call to
+.Xr execve 2
+remain in effect until the new program releases them.
+If the new program does not know about the locks, they will not be
+released until the program exits.
+.Pp
+A potential for deadlock occurs if a process controlling a locked region
+is put to sleep by attempting to lock the locked region of another process.
+This implementation detects that sleeping until a locked region is unlocked
+would cause a deadlock and fails with an
+.Er EDEADLK
+error.
+.Sh RETURN VALUES
+Upon successful completion, the value returned depends on
+.Fa cmd
+as follows:
+.Bl -tag -width F_GETOWNX -offset indent
+.It Dv F_DUPFD
+A new file descriptor.
+.It Dv F_DUP2FD
+A file descriptor equal to
+.Fa arg .
+.It Dv F_GETFD
+Value of flag (only the low-order bit is defined).
+.It Dv F_GETFL
+Value of flags.
+.It Dv F_GETOWN
+Value of file descriptor owner.
+.It other
+Value other than -1.
+.El
+.Pp
+Otherwise, a value of -1 is returned and
+.Va errno
+is set to indicate the error.
+.Sh ERRORS
+The
+.Fn fcntl
+system call will fail if:
+.Bl -tag -width Er
+.It Bq Er EAGAIN
+The argument
+.Fa cmd
+is
+.Dv F_SETLK ,
+the type of lock
+.Pq Fa l_type
+is a shared lock
+.Pq Dv F_RDLCK
+or exclusive lock
+.Pq Dv F_WRLCK ,
+and the segment of a file to be locked is already
+exclusive-locked by another process;
+or the type is an exclusive lock and some portion of the
+segment of a file to be locked is already shared-locked or
+exclusive-locked by another process.
+.It Bq Er EBADF
+The
+.Fa fd
+argument
+is not a valid open file descriptor.
+.Pp
+The argument
+.Fa cmd
+is
+.Dv F_DUP2FD ,
+and
+.Fa arg
+is not a valid file descriptor.
+.Pp
+The argument
+.Fa cmd
+is
+.Dv F_SETLK
+or
+.Dv F_SETLKW ,
+the type of lock
+.Pq Fa l_type
+is a shared lock
+.Pq Dv F_RDLCK ,
+and
+.Fa fd
+is not a valid file descriptor open for reading.
+.Pp
+The argument
+.Fa cmd
+is
+.Dv F_SETLK
+or
+.Dv F_SETLKW ,
+the type of lock
+.Pq Fa l_type
+is an exclusive lock
+.Pq Dv F_WRLCK ,
+and
+.Fa fd
+is not a valid file descriptor open for writing.
+.It Bq Er EDEADLK
+The argument
+.Fa cmd
+is
+.Dv F_SETLKW ,
+and a deadlock condition was detected.
+.It Bq Er EINTR
+The argument
+.Fa cmd
+is
+.Dv F_SETLKW ,
+and the system call was interrupted by a signal.
+.It Bq Er EINVAL
+The
+.Fa cmd
+argument
+is
+.Dv F_DUPFD
+and
+.Fa arg
+is negative or greater than the maximum allowable number
+(see
+.Xr getdtablesize 2 ) .
+.Pp
+The argument
+.Fa cmd
+is
+.Dv F_GETLK ,
+.Dv F_SETLK
+or
+.Dv F_SETLKW
+and the data to which
+.Fa arg
+points is not valid.
+.It Bq Er EMFILE
+The argument
+.Fa cmd
+is
+.Dv F_DUPFD
+or
+.Dv F_DUP2FD
+and the maximum number of file descriptors permitted for the
+process are already in use,
+or no file descriptors greater than or equal to
+.Fa arg
+are available.
+.It Bq Er ENOLCK
+The argument
+.Fa cmd
+is
+.Dv F_SETLK
+or
+.Dv F_SETLKW ,
+and satisfying the lock or unlock request would result in the
+number of locked regions in the system exceeding a system-imposed limit.
+.It Bq Er EOPNOTSUPP
+The argument
+.Fa cmd
+is
+.Dv F_GETLK ,
+.Dv F_SETLK
+or
+.Dv F_SETLKW
+and
+.Fa fd
+refers to a file for which locking is not supported.
+.It Bq Er EOVERFLOW
+The argument
+.Fa cmd
+is
+.Dv F_GETLK ,
+.Dv F_SETLK
+or
+.Dv F_SETLKW
+and an
+.Fa off_t
+calculation overflowed.
+.It Bq Er EPERM
+The
+.Fa cmd
+argument
+is
+.Dv F_SETOWN
+and
+the process ID or process group given as an argument is in a
+different session than the caller.
+.It Bq Er ESRCH
+The
+.Fa cmd
+argument
+is
+.Dv F_SETOWN
+and
+the process ID given as argument is not in use.
+.El
+.Pp
+In addition, if
+.Fa fd
+refers to a descriptor open on a terminal device (as opposed to a
+descriptor open on a socket), a
+.Fa cmd
+of
+.Dv F_SETOWN
+can fail for the same reasons as in
+.Xr tcsetpgrp 3 ,
+and a
+.Fa cmd
+of
+.Dv F_GETOWN
+for the reasons as stated in
+.Xr tcgetpgrp 3 .
+.Sh SEE ALSO
+.Xr close 2 ,
+.Xr dup2 2 ,
+.Xr execve 2 ,
+.Xr flock 2 ,
+.Xr getdtablesize 2 ,
+.Xr open 2 ,
+.Xr sigaction 2 ,
+.Xr lockf 3 ,
+.Xr tcgetpgrp 3 ,
+.Xr tcsetpgrp 3
+.Sh STANDARDS
+The
+.Dv F_DUP2FD
+constant is non portable.
+It is provided for compatibility with AIX and Solaris.
+.Sh HISTORY
+The
+.Fn fcntl
+system call appeared in
+.Bx 4.2 .
+.Pp
+The
+.Dv F_DUP2FD
+constant first appeared in
+.Fx 7.1 .
diff --git a/lib/libc/sys/fcntl.c b/lib/libc/sys/fcntl.c
new file mode 100644
index 0000000..470f8ab
--- /dev/null
+++ b/lib/libc/sys/fcntl.c
@@ -0,0 +1,89 @@
+/*-
+ * Copyright (c) 2008 Isilon Inc http://www.isilon.com/
+ * Authors: Doug Rabson <dfr@rabson.org>
+ * Developed with Red Inc: Alfred Perlstein <alfred@freebsd.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <fcntl.h>
+#include <stdarg.h>
+#include <sys/types.h>
+#include <sys/syscall.h>
+#include "libc_private.h"
+
+__weak_reference(__fcntl_compat, fcntl);
+
+int
+__fcntl_compat(int fd, int cmd, ...)
+{
+	va_list args;
+	long arg;
+	struct oflock ofl;
+	struct flock *flp;
+	int res;
+
+	va_start(args, cmd);
+	arg = va_arg(args, long);
+	va_end(args);
+
+	if (__getosreldate() >= 800028) {
+		return (__sys_fcntl(fd, cmd, arg));
+	} else {
+		if (cmd == F_GETLK || cmd == F_SETLK || cmd == F_SETLKW) {
+			/*
+			 * Convert new-style struct flock (which
+			 * includes l_sysid) to old-style.
+			 */
+			flp = (struct flock *) (uintptr_t) arg;
+			ofl.l_start = flp->l_start;
+			ofl.l_len = flp->l_len;
+			ofl.l_pid = flp->l_pid;
+			ofl.l_type = flp->l_type;
+			ofl.l_whence = flp->l_whence;
+
+			switch (cmd) {
+			case F_GETLK:
+				res = __sys_fcntl(fd, F_OGETLK, &ofl);
+				if (res >= 0) {
+					flp->l_start = ofl.l_start;
+					flp->l_len = ofl.l_len;
+					flp->l_pid = ofl.l_pid;
+					flp->l_type = ofl.l_type;
+					flp->l_whence = ofl.l_whence;
+					flp->l_sysid = 0;
+				}
+				return (res);
+
+			case F_SETLK:
+				return (__sys_fcntl(fd, F_OSETLK, &ofl));
+
+			case F_SETLKW:
+				return (__sys_fcntl(fd, F_OSETLKW, &ofl));
+			}
+		}
+		return (__sys_fcntl(fd, cmd, arg));
+	}
+}
diff --git a/lib/libc/sys/fhopen.2 b/lib/libc/sys/fhopen.2
new file mode 100644
index 0000000..2a609c1
--- /dev/null
+++ b/lib/libc/sys/fhopen.2
@@ -0,0 +1,147 @@
+.\"	$NetBSD: fhopen.2,v 1.1 1999/06/30 01:32:15 wrstuden Exp $
+.\"
+.\" Copyright (c) 1999 National Aeronautics & Space Administration
+.\" All rights reserved.
+.\"
+.\" This software was written by William Studenmund of the
+.\" Numerical Aerospace Simulation Facility, NASA Ames Research Center.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 3. Neither the name of the National Aeronautics & Space Administration
+.\"    nor the names of its contributors may be used to endorse or promote
+.\"    products derived from this software without specific prior written
+.\"    permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE NATIONAL AERONAUTICS & SPACE ADMINISTRATION
+.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+.\" PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE ADMINISTRATION OR CONTRIB-
+.\" UTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
+.\" OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+.\" POSSIBILITY OF SUCH DAMAGE.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd June 29, 1999
+.Dt FHOPEN 2
+.Os
+.Sh NAME
+.Nm fhopen ,
+.Nm fhstat ,
+.Nm fhstatfs
+.Nd access file via file handle
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In sys/param.h
+.In sys/mount.h
+.In sys/stat.h
+.Ft int
+.Fn fhopen "const fhandle_t *fhp" "int flags"
+.Ft int
+.Fn fhstat "const fhandle_t *fhp" "struct stat *sb"
+.Ft int
+.Fn fhstatfs "const fhandle_t *fhp" "struct statfs *buf"
+.Sh DESCRIPTION
+These system calls provide a means to access a file given the file handle
+.Fa fhp .
+As this method bypasses directory access restrictions, these calls are
+restricted to the superuser.
+.Pp
+The
+.Fn fhopen
+system call
+opens the file referenced by
+.Fa fhp
+for reading and/or writing as specified by the argument
+.Fa flags
+and returns the file descriptor to the calling process.
+The
+.Fa flags
+argument
+is specified by
+.Em or Ns 'ing
+together the flags used for the
+.Xr open 2
+system call.
+All said flags are valid except for
+.Dv O_CREAT .
+.Pp
+The
+.Fn fhstat
+and
+.Fn fhstatfs
+system calls
+provide the functionality of the
+.Xr fstat 2
+and
+.Xr fstatfs 2
+calls except that they return information for the file referred to by
+.Fa fhp
+rather than an open file.
+.Sh RETURN VALUES
+Upon successful completion,
+.Fn fhopen
+returns the file descriptor for the opened file;
+otherwise the value \-1 is returned and the global variable
+.Va errno
+is set to indicate the error.
+.Pp
+.Rv -std fhstat fhstatfs
+.Sh ERRORS
+In addition to the errors returned by
+.Xr open 2 ,
+.Xr fstat 2 ,
+and
+.Xr fstatfs 2
+respectively,
+.Fn fhopen ,
+.Fn fhstat ,
+and
+.Fn fhstatfs
+will return
+.Bl -tag -width Er
+.It Bq Er EINVAL
+Calling
+.Fn fhopen
+with
+.Dv O_CREAT
+set.
+.It Bq Er ESTALE
+The file handle
+.Fa fhp
+is no longer valid.
+.El
+.Sh SEE ALSO
+.Xr fstat 2 ,
+.Xr fstatfs 2 ,
+.Xr getfh 2 ,
+.Xr open 2
+.Sh HISTORY
+The
+.Fn fhopen ,
+.Fn fhstat ,
+and
+.Fn fhstatfs
+system calls first appeared in
+.Nx 1.5
+and were adapted to
+.Fx 4.0
+by
+.An Alfred Perlstein .
+.Sh AUTHORS
+This manual page was written by
+.An William Studenmund
+for
+.Nx .
diff --git a/lib/libc/sys/flock.2 b/lib/libc/sys/flock.2
new file mode 100644
index 0000000..93f1f66
--- /dev/null
+++ b/lib/libc/sys/flock.2
@@ -0,0 +1,171 @@
+.\" Copyright (c) 1983, 1991, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"     @(#)flock.2	8.2 (Berkeley) 12/11/93
+.\" $FreeBSD$
+.\"
+.Dd January 22, 2008
+.Dt FLOCK 2
+.Os
+.Sh NAME
+.Nm flock
+.Nd "apply or remove an advisory lock on an open file"
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In sys/file.h
+.Fd "#define   LOCK_SH        0x01      /* shared file lock */"
+.Fd "#define   LOCK_EX        0x02      /* exclusive file lock */"
+.Fd "#define   LOCK_NB        0x04      /* do not block when locking */"
+.Fd "#define   LOCK_UN        0x08      /* unlock file */"
+.Ft int
+.Fn flock "int fd" "int operation"
+.Sh DESCRIPTION
+The
+.Fn flock
+system call applies or removes an
+.Em advisory
+lock on the file associated with the file descriptor
+.Fa fd .
+A lock is applied by specifying an
+.Fa operation
+argument that is one of
+.Dv LOCK_SH
+or
+.Dv LOCK_EX
+with the optional addition of
+.Dv LOCK_NB .
+To unlock
+an existing lock
+.Dv operation
+should be
+.Dv LOCK_UN .
+.Pp
+Advisory locks allow cooperating processes to perform
+consistent operations on files, but do not guarantee
+consistency (i.e., processes may still access files
+without using advisory locks possibly resulting in
+inconsistencies).
+.Pp
+The locking mechanism allows two types of locks:
+.Em shared
+locks and
+.Em exclusive
+locks.
+At any time multiple shared locks may be applied to a file,
+but at no time are multiple exclusive, or both shared and exclusive,
+locks allowed simultaneously on a file.
+.Pp
+A shared lock may be
+.Em upgraded
+to an exclusive lock, and vice versa, simply by specifying
+the appropriate lock type; this results in the previous
+lock being released and the new lock applied (possibly
+after other processes have gained and released the lock).
+.Pp
+Requesting a lock on an object that is already locked
+normally causes the caller to be blocked until the lock may be
+acquired.
+If
+.Dv LOCK_NB
+is included in
+.Fa operation ,
+then this will not happen; instead the call will fail and
+the error
+.Er EWOULDBLOCK
+will be returned.
+.Sh NOTES
+Locks are on files, not file descriptors.
+That is, file descriptors
+duplicated through
+.Xr dup 2
+or
+.Xr fork 2
+do not result in multiple instances of a lock, but rather multiple
+references to a single lock.
+If a process holding a lock on a file
+forks and the child explicitly unlocks the file, the parent will
+lose its lock.
+.Pp
+The
+.Fn flock ,
+.Xr fcntl 2 ,
+and
+.Xr lockf 3
+locks are compatible.
+Processes using different locking interfaces can cooperate
+over the same file safely.
+However, only one of such interfaces should be used within
+the same process.
+If a file is locked by a process through
+.Fn flock ,
+any record within the file will be seen as locked
+from the viewpoint of another process using
+.Xr fcntl 2
+or
+.Xr lockf 3 ,
+and vice versa.
+.Pp
+Processes blocked awaiting a lock may be awakened by signals.
+.Sh RETURN VALUES
+.Rv -std flock
+.Sh ERRORS
+The
+.Fn flock
+system call fails if:
+.Bl -tag -width Er
+.It Bq Er EWOULDBLOCK
+The file is locked and the
+.Dv LOCK_NB
+option was specified.
+.It Bq Er EBADF
+The argument
+.Fa fd
+is an invalid descriptor.
+.It Bq Er EINVAL
+The argument
+.Fa fd
+refers to an object other than a file.
+.It Bq Er EOPNOTSUPP
+The argument
+.Fa fd
+refers to an object that does not support file locking.
+.El
+.Sh SEE ALSO
+.Xr close 2 ,
+.Xr dup 2 ,
+.Xr execve 2 ,
+.Xr fcntl 2 ,
+.Xr fork 2 ,
+.Xr open 2 ,
+.Xr flopen 3 ,
+.Xr lockf 3
+.Sh HISTORY
+The
+.Fn flock
+system call appeared in
+.Bx 4.2 .
diff --git a/lib/libc/sys/fork.2 b/lib/libc/sys/fork.2
new file mode 100644
index 0000000..4a8a646
--- /dev/null
+++ b/lib/libc/sys/fork.2
@@ -0,0 +1,134 @@
+.\" Copyright (c) 1980, 1991, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"	@(#)fork.2	8.1 (Berkeley) 6/4/93
+.\" $FreeBSD$
+.\"
+.Dd June 4, 1993
+.Dt FORK 2
+.Os
+.Sh NAME
+.Nm fork
+.Nd create a new process
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In sys/types.h
+.In unistd.h
+.Ft pid_t
+.Fn fork void
+.Sh DESCRIPTION
+The
+.Fn fork
+system call causes creation of a new process.
+The new process (child process) is an exact copy of the
+calling process (parent process) except for the following:
+.Bl -bullet -offset indent
+.It
+The child process has a unique process ID.
+.It
+The child process has a different parent
+process ID (i.e., the process ID of the parent process).
+.It
+The child process has its own copy of the parent's descriptors.
+These descriptors reference the same underlying objects, so that,
+for instance, file pointers in file objects are shared between
+the child and the parent, so that an
+.Xr lseek 2
+on a descriptor in the child process can affect a subsequent
+.Xr read 2
+or
+.Xr write 2
+by the parent.
+This descriptor copying is also used by the shell to
+establish standard input and output for newly created processes
+as well as to set up pipes.
+.It
+The child process' resource utilizations
+are set to 0; see
+.Xr setrlimit 2 .
+.It
+All interval timers are cleared; see
+.Xr setitimer 2 .
+.El
+.Sh RETURN VALUES
+Upon successful completion,
+.Fn fork
+returns a value
+of 0 to the child process and returns the process ID of the child
+process to the parent process.
+Otherwise, a value of -1 is returned
+to the parent process, no child process is created, and the global
+variable
+.Va errno
+is set to indicate the error.
+.Sh ERRORS
+The
+.Fn fork
+system call will fail and no child process will be created if:
+.Bl -tag -width Er
+.It Bq Er EAGAIN
+The system-imposed limit on the total
+number of processes under execution would be exceeded.
+The limit is given by the
+.Xr sysctl 3
+MIB variable
+.Dv KERN_MAXPROC .
+(The limit is actually ten less than this
+except for the super user).
+.It Bq Er EAGAIN
+The user is not the super user, and
+the system-imposed limit
+on the total number of
+processes under execution by a single user would be exceeded.
+The limit is given by the
+.Xr sysctl 3
+MIB variable
+.Dv KERN_MAXPROCPERUID .
+.It Bq Er EAGAIN
+The user is not the super user, and
+the soft resource limit corresponding to the
+.Fa resource
+argument
+.Dv RLIMIT_NPROC
+would be exceeded (see
+.Xr getrlimit 2 ) .
+.It Bq Er ENOMEM
+There is insufficient swap space for the new process.
+.El
+.Sh SEE ALSO
+.Xr execve 2 ,
+.Xr rfork 2 ,
+.Xr setitimer 2 ,
+.Xr setrlimit 2 ,
+.Xr vfork 2 ,
+.Xr wait 2
+.Sh HISTORY
+The
+.Fn fork
+function appeared in
+.At v6 .
diff --git a/lib/libc/sys/fsync.2 b/lib/libc/sys/fsync.2
new file mode 100644
index 0000000..7bdc487
--- /dev/null
+++ b/lib/libc/sys/fsync.2
@@ -0,0 +1,87 @@
+.\" Copyright (c) 1983, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"     @(#)fsync.2	8.1 (Berkeley) 6/4/93
+.\" $FreeBSD$
+.\"
+.Dd June 4, 1993
+.Dt FSYNC 2
+.Os
+.Sh NAME
+.Nm fsync
+.Nd "synchronise changes to a file"
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In unistd.h
+.Ft int
+.Fn fsync "int fd"
+.Sh DESCRIPTION
+The
+.Fn fsync
+system call
+causes all modified data and attributes of
+.Fa fd
+to be moved to a permanent storage device.
+This normally results in all in-core modified copies
+of buffers for the associated file to be written to a disk.
+.Pp
+The
+.Fn fsync
+system call
+should be used by programs that require a file to be
+in a known state, for example, in building a simple transaction
+facility.
+.Sh RETURN VALUES
+.Rv -std fsync
+.Sh ERRORS
+The
+.Fn fsync
+fails if:
+.Bl -tag -width Er
+.It Bq Er EBADF
+The
+.Fa fd
+argument
+is not a valid descriptor.
+.It Bq Er EINVAL
+The
+.Fa fd
+argument
+refers to a socket, not to a file.
+.It Bq Er EIO
+An I/O error occurred while reading from or writing to the file system.
+.El
+.Sh SEE ALSO
+.Xr sync 2 ,
+.Xr syncer 4 ,
+.Xr sync 8
+.Sh HISTORY
+The
+.Fn fsync
+system call appeared in
+.Bx 4.2 .
diff --git a/lib/libc/sys/ftruncate.c b/lib/libc/sys/ftruncate.c
new file mode 100644
index 0000000..78b5a36
--- /dev/null
+++ b/lib/libc/sys/ftruncate.c
@@ -0,0 +1,55 @@
+/*
+ * Copyright (c) 1992, 1993
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#if defined(LIBC_SCCS) && !defined(lint)
+static char sccsid[] = "@(#)ftruncate.c	8.1 (Berkeley) 6/17/93";
+#endif /* LIBC_SCCS and not lint */
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/types.h>
+#include <sys/syscall.h>
+#include <unistd.h>
+#include "libc_private.h"
+
+/*
+ * This function provides 64-bit offset padding that
+ * is not supplied by GCC 1.X but is supplied by GCC 2.X.
+ */
+int
+ftruncate(fd, length)
+	int	fd;
+	off_t	length;
+{
+
+	if (__getosreldate() >= 700051)
+		return(__sys_ftruncate(fd, length));
+	else
+		return(__sys_freebsd6_ftruncate(fd, 0, length));
+}
diff --git a/lib/libc/sys/getdirentries.2 b/lib/libc/sys/getdirentries.2
new file mode 100644
index 0000000..e16e7f2
--- /dev/null
+++ b/lib/libc/sys/getdirentries.2
@@ -0,0 +1,185 @@
+.\" Copyright (c) 1989, 1991, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"	@(#)getdirentries.2	8.2 (Berkeley) 5/3/95
+.\" $FreeBSD$
+.\"
+.Dd May 3, 1995
+.Dt GETDIRENTRIES 2
+.Os
+.Sh NAME
+.Nm getdirentries ,
+.Nm getdents
+.Nd "get directory entries in a file system independent format"
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In sys/types.h
+.In dirent.h
+.Ft int
+.Fn getdirentries "int fd" "char *buf" "int nbytes" "long *basep"
+.Ft int
+.Fn getdents "int fd" "char *buf" "int nbytes"
+.Sh DESCRIPTION
+The
+.Fn getdirentries
+and
+.Fn getdents
+system calls read directory entries from the directory
+referenced by the file descriptor
+.Fa fd
+into the buffer pointed to by
+.Fa buf ,
+in a file system independent format.
+Up to
+.Fa nbytes
+of data will be transferred.
+The
+.Fa nbytes
+argument must be greater than or equal to the
+block size associated with the file,
+see
+.Xr stat 2 .
+Some file systems may not support these system calls
+with buffers smaller than this size.
+.Pp
+The data in the buffer is a series of
+.Vt dirent
+structures each containing the following entries:
+.Bd -literal -offset indent
+u_int32_t d_fileno;
+u_int16_t d_reclen;
+u_int8_t  d_type;
+u_int8_t  d_namlen;
+char	d_name[MAXNAMELEN + 1];	/* see below */
+.Ed
+.Pp
+The
+.Fa d_fileno
+entry is a number which is unique for each
+distinct file in the file system.
+Files that are linked by hard links (see
+.Xr link 2 )
+have the same
+.Fa d_fileno .
+The
+.Fa d_reclen
+entry is the length, in bytes, of the directory record.
+The
+.Fa d_type
+entry is the type of the file pointed to by the directory record.
+The file type values are defined in
+.Fa <sys/dirent.h> .
+The
+.Fa d_name
+entry contains a null terminated file name.
+The
+.Fa d_namlen
+entry specifies the length of the file name excluding the null byte.
+Thus the actual size of
+.Fa d_name
+may vary from 1 to
+.Dv MAXNAMELEN
+\&+ 1.
+.Pp
+Entries may be separated by extra space.
+The
+.Fa d_reclen
+entry may be used as an offset from the start of a
+.Fa dirent
+structure to the next structure, if any.
+.Pp
+The actual number of bytes transferred is returned.
+The current position pointer associated with
+.Fa fd
+is set to point to the next block of entries.
+The pointer may not advance by the number of bytes returned by
+.Fn getdirentries
+or
+.Fn getdents .
+A value of zero is returned when
+the end of the directory has been reached.
+.Pp
+The
+.Fn getdirentries
+system call writes the position of the block read into the location pointed to by
+.Fa basep .
+Alternatively, the current position pointer may be set and retrieved by
+.Xr lseek 2 .
+The current position pointer should only be set to a value returned by
+.Xr lseek 2 ,
+a value returned in the location pointed to by
+.Fa basep
+.Fn ( getdirentries
+only)
+or zero.
+.Sh RETURN VALUES
+If successful, the number of bytes actually transferred is returned.
+Otherwise, -1 is returned and the global variable
+.Va errno
+is set to indicate the error.
+.Sh ERRORS
+The
+.Fn getdirentries
+system call
+will fail if:
+.Bl -tag -width Er
+.It Bq Er EBADF
+The
+.Fa fd
+argument
+is not a valid file descriptor open for reading.
+.It Bq Er EFAULT
+Either
+.Fa buf
+or
+.Fa basep
+point outside the allocated address space.
+.It Bq Er EINVAL
+The file referenced by
+.Fa fd
+is not a directory, or
+.Fa nbytes
+is too small for returning a directory entry or block of entries,
+or the current position pointer is invalid.
+.It Bq Er EIO
+An
+.Tn I/O
+error occurred while reading from or writing to the file system.
+.El
+.Sh SEE ALSO
+.Xr lseek 2 ,
+.Xr open 2
+.Sh HISTORY
+The
+.Fn getdirentries
+system call first appeared in
+.Bx 4.4 .
+The
+.Fn getdents
+system call first appeared in
+.Fx 3.0 .
diff --git a/lib/libc/sys/getdtablesize.2 b/lib/libc/sys/getdtablesize.2
new file mode 100644
index 0000000..916b91e
--- /dev/null
+++ b/lib/libc/sys/getdtablesize.2
@@ -0,0 +1,60 @@
+.\" Copyright (c) 1983, 1991, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"     @(#)getdtablesize.2	8.1 (Berkeley) 6/4/93
+.\" $FreeBSD$
+.\"
+.Dd June 4, 1993
+.Dt GETDTABLESIZE 2
+.Os
+.Sh NAME
+.Nm getdtablesize
+.Nd get descriptor table size
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In unistd.h
+.Ft int
+.Fn getdtablesize void
+.Sh DESCRIPTION
+Each process has a fixed size descriptor table,
+which is guaranteed to have at least 20 slots.
+The entries in
+the descriptor table are numbered with small integers starting at 0.
+The
+.Fn getdtablesize
+system call returns the size of this table.
+.Sh SEE ALSO
+.Xr close 2 ,
+.Xr dup 2 ,
+.Xr open 2 ,
+.Xr select 2
+.Sh HISTORY
+The
+.Fn getdtablesize
+system call appeared in
+.Bx 4.2 .
diff --git a/lib/libc/sys/getfh.2 b/lib/libc/sys/getfh.2
new file mode 100644
index 0000000..c8f6d9d
--- /dev/null
+++ b/lib/libc/sys/getfh.2
@@ -0,0 +1,111 @@
+.\" Copyright (c) 1989, 1991, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"	@(#)getfh.2	8.1 (Berkeley) 6/9/93
+.\" $FreeBSD$
+.\"
+.Dd April 6, 2004
+.Dt GETFH 2
+.Os
+.Sh NAME
+.Nm getfh ,
+.Nm lgetfh
+.Nd get file handle
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In sys/param.h
+.In sys/mount.h
+.Ft int
+.Fn getfh "const char *path" "fhandle_t *fhp"
+.Ft int
+.Fn lgetfh "const char *path" "fhandle_t *fhp"
+.Sh DESCRIPTION
+The
+.Fn getfh
+system call
+returns a file handle for the specified file or directory
+in the file handle pointed to by
+.Fa fhp .
+The
+.Fn lgetfh
+system call is like
+.Fn getfh
+except in the case where the named file is a symbolic link,
+in which case
+.Fn lgetfh
+returns information about the link,
+while
+.Fn getfh
+returns information about the file the link references.
+These system calls are restricted to the superuser.
+.Sh RETURN VALUES
+.Rv -std
+.Sh ERRORS
+The
+.Fn getfh
+and
+.Fn lgetfh
+system calls
+fail if one or more of the following are true:
+.Bl -tag -width Er
+.It Bq Er ENOTDIR
+A component of the path prefix of
+.Fa path
+is not a directory.
+.It Bq Er ENAMETOOLONG
+The length of a component of
+.Fa path
+exceeds 255 characters,
+or the length of
+.Fa path
+exceeds 1023 characters.
+.It Bq Er ENOENT
+The file referred to by
+.Fa path
+does not exist.
+.It Bq Er EACCES
+Search permission is denied for a component of the path prefix of
+.Fa path .
+.It Bq Er ELOOP
+Too many symbolic links were encountered in translating
+.Fa path .
+.It Bq Er EFAULT
+The
+.Fa fhp
+argument
+points to an invalid address.
+.It Bq Er EIO
+An
+.Tn I/O
+error occurred while reading from or writing to the file system.
+.El
+.Sh HISTORY
+The
+.Fn getfh
+system call first appeared in
+.Bx 4.4 .
diff --git a/lib/libc/sys/getfsstat.2 b/lib/libc/sys/getfsstat.2
new file mode 100644
index 0000000..c27c6c2
--- /dev/null
+++ b/lib/libc/sys/getfsstat.2
@@ -0,0 +1,122 @@
+.\" Copyright (c) 1989, 1991, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"	@(#)getfsstat.2	8.3 (Berkeley) 5/25/95
+.\" $FreeBSD$
+.\"
+.Dd November 20, 2003
+.Dt GETFSSTAT 2
+.Os
+.Sh NAME
+.Nm getfsstat
+.Nd get list of all mounted file systems
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In sys/param.h
+.In sys/ucred.h
+.In sys/mount.h
+.Ft int
+.Fn getfsstat "struct statfs *buf" "long bufsize" "int flags"
+.Sh DESCRIPTION
+The
+.Fn getfsstat
+system call
+returns information about all mounted file systems.
+The
+.Fa buf
+argument
+is a pointer to
+.Vt statfs
+structures, as described in
+.Xr statfs 2 .
+.Pp
+Fields that are undefined for a particular file system are set to -1.
+The buffer is filled with an array of
+.Fa statfs
+structures, one for each mounted file system
+up to the byte count specified by
+.Fa bufsize .
+Note, the
+.Fa bufsize
+argument is the number of bytes that
+.Fa buf
+can hold, not the count of statfs structures it will hold.
+.Pp
+If
+.Fa buf
+is given as NULL,
+.Fn getfsstat
+returns just the number of mounted file systems.
+.Pp
+Normally
+.Fa flags
+should be specified as
+.Dv MNT_WAIT .
+If
+.Fa flags
+is set to
+.Dv MNT_NOWAIT ,
+.Fn getfsstat
+will return the information it has available without requesting
+an update from each file system.
+Thus, some of the information will be out of date, but
+.Fn getfsstat
+will not block waiting for information from a file system that is
+unable to respond.
+.Sh RETURN VALUES
+Upon successful completion, the number of
+.Fa statfs
+structures is returned.
+Otherwise, -1 is returned and the global variable
+.Va errno
+is set to indicate the error.
+.Sh ERRORS
+The
+.Fn getfsstat
+system call
+fails if one or more of the following are true:
+.Bl -tag -width Er
+.It Bq Er EFAULT
+The
+.Fa buf
+argument
+points to an invalid address.
+.It Bq Er EIO
+An
+.Tn I/O
+error occurred while reading from or writing to the file system.
+.El
+.Sh SEE ALSO
+.Xr statfs 2 ,
+.Xr fstab 5 ,
+.Xr mount 8
+.Sh HISTORY
+The
+.Fn getfsstat
+system call first appeared in
+.Bx 4.4 .
diff --git a/lib/libc/sys/getgid.2 b/lib/libc/sys/getgid.2
new file mode 100644
index 0000000..b03040b
--- /dev/null
+++ b/lib/libc/sys/getgid.2
@@ -0,0 +1,81 @@
+.\" Copyright (c) 1983, 1991, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"     @(#)getgid.2	8.1 (Berkeley) 6/4/93
+.\" $FreeBSD$
+.\"
+.Dd June 4, 1993
+.Dt GETGID 2
+.Os
+.Sh NAME
+.Nm getgid ,
+.Nm getegid
+.Nd get group process identification
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In sys/types.h
+.In unistd.h
+.Ft gid_t
+.Fn getgid void
+.Ft gid_t
+.Fn getegid void
+.Sh DESCRIPTION
+The
+.Fn getgid
+system call returns the real group ID of the calling process,
+.Fn getegid
+returns the effective group ID of the calling process.
+.Pp
+The real group ID is specified at login time.
+.Pp
+The real group ID is the group of the user who invoked the program.
+As the effective group ID gives the process additional permissions
+during the execution of
+.Dq Em set-group-ID
+mode processes,
+.Fn getgid
+is used to determine the real-user-id of the calling process.
+.Sh ERRORS
+The
+.Fn getgid
+and
+.Fn getegid
+system calls are always successful, and no return value is reserved to
+indicate an error.
+.Sh SEE ALSO
+.Xr getuid 2 ,
+.Xr issetugid 2 ,
+.Xr setgid 2 ,
+.Xr setregid 2
+.Sh STANDARDS
+The
+.Fn getgid
+and
+.Fn getegid
+system calls are expected to conform to
+.St -p1003.1-90 .
diff --git a/lib/libc/sys/getgroups.2 b/lib/libc/sys/getgroups.2
new file mode 100644
index 0000000..c02b229
--- /dev/null
+++ b/lib/libc/sys/getgroups.2
@@ -0,0 +1,101 @@
+.\" Copyright (c) 1983, 1991, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"     @(#)getgroups.2	8.2 (Berkeley) 4/16/94
+.\" $FreeBSD$
+.\"
+.Dd March 5, 1999
+.Dt GETGROUPS 2
+.Os
+.Sh NAME
+.Nm getgroups
+.Nd get group access list
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In sys/param.h
+.In unistd.h
+.Ft int
+.Fn getgroups "int gidsetlen" "gid_t *gidset"
+.Sh DESCRIPTION
+The
+.Fn getgroups
+system call
+gets the current group access list of the user process
+and stores it in the array
+.Fa gidset .
+The
+.Fa gidsetlen
+argument
+indicates the number of entries that may be placed in
+.Fa gidset .
+The
+.Fn getgroups
+system call
+returns the actual number of groups returned in
+.Fa gidset .
+At least one and as many as {NGROUPS_MAX}+1 values may be returned.
+If
+.Fa gidsetlen
+is zero,
+.Fn getgroups
+returns the number of supplementary group IDs associated with
+the calling process without modifying the array pointed to by
+.Fa gidset .
+.Sh RETURN VALUES
+A successful call returns the number of groups in the group set.
+A value of -1 indicates that an error occurred, and the error
+code is stored in the global variable
+.Va errno .
+.Sh ERRORS
+The possible errors for
+.Fn getgroups
+are:
+.Bl -tag -width Er
+.It Bq Er EINVAL
+The argument
+.Fa gidsetlen
+is smaller than the number of groups in the group set.
+.It Bq Er EFAULT
+The argument
+.Fa gidset
+specifies
+an invalid address.
+.El
+.Sh SEE ALSO
+.Xr setgroups 2 ,
+.Xr initgroups 3
+.Sh STANDARDS
+The
+.Fn getgroups
+system call conforms to
+.St -p1003.1-2008 .
+.Sh HISTORY
+The
+.Fn getgroups
+system call appeared in
+.Bx 4.2 .
diff --git a/lib/libc/sys/getitimer.2 b/lib/libc/sys/getitimer.2
new file mode 100644
index 0000000..539dea6
--- /dev/null
+++ b/lib/libc/sys/getitimer.2
@@ -0,0 +1,180 @@
+.\" Copyright (c) 1983, 1991, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"     @(#)getitimer.2	8.3 (Berkeley) 5/16/95
+.\" $FreeBSD$
+.\"
+.Dd May 16, 1995
+.Dt GETITIMER 2
+.Os
+.Sh NAME
+.Nm getitimer ,
+.Nm setitimer
+.Nd get/set value of interval timer
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In sys/time.h
+.Fd "#define ITIMER_REAL      0"
+.Fd "#define ITIMER_VIRTUAL   1"
+.Fd "#define ITIMER_PROF      2"
+.Ft int
+.Fn getitimer "int which" "struct itimerval *value"
+.Ft int
+.Fn setitimer "int which" "const struct itimerval *value" "struct itimerval *ovalue"
+.Sh DESCRIPTION
+The system provides each process with three interval timers,
+defined in
+.In sys/time.h .
+The
+.Fn getitimer
+system call returns the current value for the timer specified in
+.Fa which
+in the structure at
+.Fa value .
+The
+.Fn setitimer
+system call sets a timer to the specified
+.Fa value
+(returning the previous value of the timer if
+.Fa ovalue
+is not a null pointer).
+.Pp
+A timer value is defined by the
+.Fa itimerval
+structure:
+.Bd -literal -offset indent
+struct itimerval {
+	struct	timeval it_interval;	/* timer interval */
+	struct	timeval it_value;	/* current value */
+};
+.Ed
+.Pp
+If
+.Fa it_value
+is non-zero, it indicates the time to the next timer expiration.
+If
+.Fa it_interval
+is non-zero, it specifies a value to be used in reloading
+.Fa it_value
+when the timer expires.
+Setting
+.Fa it_value
+to 0 disables a timer, regardless of the value of
+.Fa it_interval .
+Setting
+.Fa it_interval
+to 0 causes a timer to be disabled after its next expiration (assuming
+.Fa it_value
+is non-zero).
+.Pp
+Time values smaller than the resolution of the
+system clock are rounded up to this resolution
+(typically 10 milliseconds).
+.Pp
+The
+.Dv ITIMER_REAL
+timer decrements in real time.
+A
+.Dv SIGALRM
+signal is
+delivered when this timer expires.
+.Pp
+The
+.Dv ITIMER_VIRTUAL
+timer decrements in process virtual time.
+It runs only when the process is executing.
+A
+.Dv SIGVTALRM
+signal
+is delivered when it expires.
+.Pp
+The
+.Dv ITIMER_PROF
+timer decrements both in process virtual time and
+when the system is running on behalf of the process.
+It is designed
+to be used by interpreters in statistically profiling the execution
+of interpreted programs.
+Each time the
+.Dv ITIMER_PROF
+timer expires, the
+.Dv SIGPROF
+signal is
+delivered.
+Because this signal may interrupt in-progress
+system calls, programs using this timer must be prepared to
+restart interrupted system calls.
+.Pp
+The maximum number of seconds allowed for
+.Fa it_interval
+and
+.Fa it_value
+in
+.Fn setitimer
+is 100000000.
+.Sh NOTES
+Three macros for manipulating time values are defined in
+.In sys/time.h .
+The
+.Fn timerclear
+macro
+sets a time value to zero,
+.Fn timerisset
+tests if a time value is non-zero, and
+.Fn timercmp
+compares two time values.
+.Sh RETURN VALUES
+.Rv -std
+.Sh ERRORS
+The
+.Fn getitimer
+and
+.Fn setitimer
+system calls
+will fail if:
+.Bl -tag -width Er
+.It Bq Er EFAULT
+The
+.Fa value
+argument specified a bad address.
+.It Bq Er EINVAL
+The
+.Fa value
+argument specified a time that was too large
+to be handled.
+.El
+.Sh SEE ALSO
+.Xr gettimeofday 2 ,
+.Xr select 2 ,
+.Xr sigaction 2 ,
+.Xr clocks 7
+.Sh HISTORY
+The
+.Fn getitimer
+system call appeared in
+.Bx 4.2 .
diff --git a/lib/libc/sys/getlogin.2 b/lib/libc/sys/getlogin.2
new file mode 100644
index 0000000..b7c27df
--- /dev/null
+++ b/lib/libc/sys/getlogin.2
@@ -0,0 +1,204 @@
+.\" Copyright (c) 1989, 1991, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"	@(#)getlogin.2	8.1 (Berkeley) 6/9/93
+.\" $FreeBSD$
+.\"
+.Dd June 9, 1993
+.Dt GETLOGIN 2
+.Os
+.Sh NAME
+.Nm getlogin ,
+.Nm getlogin_r ,
+.Nm setlogin
+.Nd get/set login name
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In unistd.h
+.Ft char *
+.Fn getlogin void
+.In sys/param.h
+.Ft int
+.Fn getlogin_r "char *name" "int len"
+.Ft int
+.Fn setlogin "const char *name"
+.Sh DESCRIPTION
+The
+.Fn getlogin
+routine
+returns the login name of the user associated with the current session,
+as previously set by
+.Fn setlogin .
+The name is normally associated with a login shell
+at the time a session is created,
+and is inherited by all processes descended from the login shell.
+(This is true even if some of those processes assume another user ID,
+for example when
+.Xr su 1
+is used).
+.Pp
+The
+.Fn getlogin_r
+function
+provides the same service as
+.Fn getlogin
+except the caller must provide the buffer
+.Fa name
+with length
+.Fa len
+bytes
+to hold the result.
+The buffer should be at least
+.Dv MAXLOGNAME
+bytes in length.
+.Pp
+The
+.Fn setlogin
+system call
+sets the login name of the user associated with the current session to
+.Fa name .
+This system call is restricted to the super-user, and
+is normally used only when a new session is being created on behalf
+of the named user
+(for example, at login time, or when a remote shell is invoked).
+.Pp
+.Em NOTE :
+There is only one login name per session.
+.Pp
+It is
+.Em CRITICALLY
+important to ensure that
+.Fn setlogin
+is only ever called after the process has taken adequate steps to ensure
+that it is detached from its parent's session.
+Making a
+.Fn setsid
+system call is the
+.Em ONLY
+way to do this.
+The
+.Xr daemon 3
+function calls
+.Fn setsid
+which is an ideal way of detaching from a controlling terminal and
+forking into the background.
+.Pp
+In particular, doing a
+.Fn ioctl ttyfd TIOCNOTTY ...\&
+or
+.Fn setpgrp ...\&
+is
+.Em NOT
+sufficient.
+.Pp
+Once a parent process does a
+.Fn setsid
+system call, it is acceptable for some child of that process to then do a
+.Fn setlogin
+even though it is not the session leader, but beware that ALL processes
+in the session will change their login name at the same time, even the
+parent.
+.Pp
+This is not the same as the traditional UNIX behavior of inheriting privilege.
+.Pp
+Since the
+.Fn setlogin
+system call is restricted to the super-user, it is assumed that (like
+all other privileged programs) the programmer has taken adequate
+precautions to prevent security violations.
+.Sh RETURN VALUES
+If a call to
+.Fn getlogin
+succeeds, it returns a pointer to a null-terminated string in a static buffer,
+or
+.Dv NULL
+if the name has not been set.
+The
+.Fn getlogin_r
+function
+returns zero if successful, or the error number upon failure.
+.Pp
+.Rv -std setlogin
+.Sh ERRORS
+The following errors may be returned by these calls:
+.Bl -tag -width Er
+.It Bq Er EFAULT
+The
+.Fa name
+argument gave an
+invalid address.
+.It Bq Er EINVAL
+The
+.Fa name
+argument
+pointed to a string that was too long.
+Login names are limited to
+.Dv MAXLOGNAME
+(from
+.In sys/param.h )
+characters, currently 17 including null.
+.It Bq Er EPERM
+The caller tried to set the login name and was not the super-user.
+.It Bq Er ERANGE
+The size of the buffer is smaller than the result to be returned.
+.El
+.Sh SEE ALSO
+.Xr setsid 2 ,
+.Xr daemon 3
+.Sh STANDARDS
+The
+.Fn getlogin
+system call
+and
+the
+.Fn getlogin_r
+function
+conform to
+.St -p1003.1-96 .
+.Sh HISTORY
+The
+.Fn getlogin
+system call first appeared in
+.Bx 4.4 .
+The return value of
+.Fn getlogin_r
+was changed from earlier versions of
+.Fx
+to be conformant with
+.St -p1003.1-96 .
+.Sh BUGS
+In earlier versions of the system,
+.Fn getlogin
+failed unless the process was associated with a login terminal.
+The current implementation (using
+.Fn setlogin )
+allows getlogin to succeed even when the process has no controlling terminal.
+In earlier versions of the system, the value returned by
+.Fn getlogin
+could not be trusted without checking the user ID.
+Portable programs should probably still make this check.
diff --git a/lib/libc/sys/getpeername.2 b/lib/libc/sys/getpeername.2
new file mode 100644
index 0000000..9037119
--- /dev/null
+++ b/lib/libc/sys/getpeername.2
@@ -0,0 +1,94 @@
+.\" Copyright (c) 1983, 1991, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"     @(#)getpeername.2	8.1 (Berkeley) 6/4/93
+.\" $FreeBSD$
+.\"
+.Dd June 4, 1993
+.Dt GETPEERNAME 2
+.Os
+.Sh NAME
+.Nm getpeername
+.Nd get name of connected peer
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In sys/types.h
+.In sys/socket.h
+.Ft int
+.Fn getpeername "int s" "struct sockaddr * restrict name" "socklen_t * restrict namelen"
+.Sh DESCRIPTION
+The
+.Fn getpeername
+system call
+returns the name of the peer connected to
+socket
+.Fa s .
+The
+.Fa namelen
+argument should be initialized to indicate
+the amount of space pointed to by
+.Fa name .
+On return it contains the actual size of the name
+returned (in bytes).
+The name is truncated if the buffer provided is too small.
+.Sh RETURN VALUES
+.Rv -std getpeername
+.Sh ERRORS
+The call succeeds unless:
+.Bl -tag -width Er
+.It Bq Er EBADF
+The argument
+.Fa s
+is not a valid descriptor.
+.It Bq Er ECONNRESET
+The connection has been reset by the peer.
+.It Bq Er ENOTSOCK
+The argument
+.Fa s
+is a file, not a socket.
+.It Bq Er ENOTCONN
+The socket is not connected.
+.It Bq Er ENOBUFS
+Insufficient resources were available in the system
+to perform the operation.
+.It Bq Er EFAULT
+The
+.Fa name
+argument points to memory not in a valid part of the
+process address space.
+.El
+.Sh SEE ALSO
+.Xr accept 2 ,
+.Xr bind 2 ,
+.Xr getsockname 2 ,
+.Xr socket 2
+.Sh HISTORY
+The
+.Fn getpeername
+system call appeared in
+.Bx 4.2 .
diff --git a/lib/libc/sys/getpgrp.2 b/lib/libc/sys/getpgrp.2
new file mode 100644
index 0000000..f5e81a8
--- /dev/null
+++ b/lib/libc/sys/getpgrp.2
@@ -0,0 +1,142 @@
+.\" Copyright (c) 1983, 1991, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"     @(#)getpgrp.2	8.1 (Berkeley) 6/4/93
+.\" $FreeBSD$
+.\"
+.Dd June 4, 1993
+.Dt GETPGRP 2
+.Os
+.Sh NAME
+.Nm getpgrp
+.Nd get process group
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In unistd.h
+.Ft pid_t
+.Fn getpgrp void
+.Ft pid_t
+.Fn getpgid "pid_t pid"
+.Sh DESCRIPTION
+The process group of the current process is returned by
+.Fn getpgrp .
+The process group of the process identified by
+.Fa pid
+is returned by
+.Fn getpgid .
+If
+.Fa pid
+is zero,
+.Fn getpgid
+returns the process group of the current process.
+.Pp
+Process groups are used for distribution of signals, and
+by terminals to arbitrate requests for their input: processes
+that have the same process group as the terminal are foreground
+and may read, while others will block with a signal if they attempt
+to read.
+.Pp
+This system call is thus used by programs such as
+.Xr csh 1
+to create
+process groups
+in implementing job control.
+The
+.Fn tcgetpgrp
+and
+.Fn tcsetpgrp
+calls
+are used to get/set the process group of the control terminal.
+.Sh RETURN VALUES
+The
+.Fn getpgrp
+system call always succeeds.
+Upon successful completion, the
+.Fn getpgid
+system call returns the process group of the specified process;
+otherwise, it returns a value of \-1 and sets
+.Va errno
+to indicate the error.
+.Sh COMPATIBILITY
+This version of
+.Fn getpgrp
+differs from past Berkeley versions by not taking a
+.Fa "pid_t pid"
+argument.
+This incompatibility is required by
+.St -p1003.1-90 .
+.Pp
+From the
+.St -p1003.1-90
+Rationale:
+.Pp
+.Bx 4.3
+provides a
+.Fn getpgrp
+system call that returns the process group ID for a specified process.
+Although this function is used to support job control, all known
+job-control shells always specify the calling process with this
+function.
+Thus, the simpler
+.At V
+.Fn getpgrp
+suffices, and the added complexity of the
+.Bx 4.3
+.Fn getpgrp
+has been omitted from POSIX.1.
+The old functionality is available from the
+.Fn getpgid
+system call.
+.Sh ERRORS
+The
+.Fn getpgid
+system call
+will succeed unless:
+.Bl -tag -width Er
+.It Bq Er ESRCH
+there is no process whose process ID equals
+.Fa pid
+.El
+.Sh SEE ALSO
+.Xr getsid 2 ,
+.Xr setpgid 2 ,
+.Xr termios 4
+.Sh STANDARDS
+The
+.Fn getpgrp
+system call is expected to conform to
+.St -p1003.1-90 .
+.Sh HISTORY
+The
+.Fn getpgrp
+system call appeared in
+.Bx 4.0 .
+The
+.Fn getpgid
+system call is derived from its usage in
+.At V.4 .
diff --git a/lib/libc/sys/getpid.2 b/lib/libc/sys/getpid.2
new file mode 100644
index 0000000..aefa770
--- /dev/null
+++ b/lib/libc/sys/getpid.2
@@ -0,0 +1,91 @@
+.\" Copyright (c) 1980, 1991, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"     @(#)getpid.2	8.1 (Berkeley) 6/4/93
+.\" $FreeBSD$
+.\"
+.Dd November 2, 2006
+.Dt GETPID 2
+.Os
+.Sh NAME
+.Nm getpid ,
+.Nm getppid
+.Nd get parent or calling process identification
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In sys/types.h
+.In unistd.h
+.Ft pid_t
+.Fn getpid void
+.Ft pid_t
+.Fn getppid void
+.Sh DESCRIPTION
+The
+.Fn getpid
+system call
+returns
+the process ID of
+the calling process.
+Though the ID is guaranteed to be unique, it should
+.Em NOT
+be used for constructing temporary file names, for
+security reasons; see
+.Xr mkstemp 3
+instead.
+.Pp
+The
+.Fn getppid
+system call
+returns the process ID of the parent
+of the calling process.
+.Sh ERRORS
+The
+.Fn getpid
+and
+.Fn getppid
+system calls are always successful, and no return value is reserved to
+indicate an error.
+.Sh SEE ALSO
+.Xr fork 2 ,
+.Xr getpgrp 2 ,
+.Xr kill 2 ,
+.Xr setpgid 2 ,
+.Xr setsid 2 ,
+.Xr exec 3
+.Sh STANDARDS
+The
+.Fn getpid
+and
+.Fn getppid
+system calls are expected to conform to
+.St -p1003.1-90 .
+.Sh HISTORY
+The
+.Fn getpid
+function appeared in
+.At v7 .
diff --git a/lib/libc/sys/getpriority.2 b/lib/libc/sys/getpriority.2
new file mode 100644
index 0000000..28d1f14
--- /dev/null
+++ b/lib/libc/sys/getpriority.2
@@ -0,0 +1,150 @@
+.\" Copyright (c) 1980, 1991, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"     @(#)getpriority.2	8.1 (Berkeley) 6/4/93
+.\" $FreeBSD$
+.\"
+.Dd June 4, 1993
+.Dt GETPRIORITY 2
+.Os
+.Sh NAME
+.Nm getpriority ,
+.Nm setpriority
+.Nd get/set program scheduling priority
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In sys/time.h
+.In sys/resource.h
+.Ft int
+.Fn getpriority "int which" "int who"
+.Ft int
+.Fn setpriority "int which" "int who" "int prio"
+.Sh DESCRIPTION
+The scheduling
+priority of the process, process group, or user, as indicated by
+.Fa which
+and
+.Fa who
+is obtained with the
+.Fn getpriority
+system call and set with the
+.Fn setpriority
+system call.
+The
+.Fa which
+argument
+is one of
+.Dv PRIO_PROCESS ,
+.Dv PRIO_PGRP ,
+or
+.Dv PRIO_USER ,
+and
+.Fa who
+is interpreted relative to
+.Fa which
+(a process identifier for
+.Dv PRIO_PROCESS ,
+process group
+identifier for
+.Dv PRIO_PGRP ,
+and a user ID for
+.Dv PRIO_USER ) .
+A zero value of
+.Fa who
+denotes the current process, process group, or user.
+The
+.Fa prio
+argument
+is a value in the range -20 to 20.
+The default priority is 0;
+lower priorities cause more favorable scheduling.
+.Pp
+The
+.Fn getpriority
+system call returns the highest priority (lowest numerical value)
+enjoyed by any of the specified processes.
+The
+.Fn setpriority
+system call sets the priorities of all of the specified processes
+to the specified value.
+Only the super-user may lower priorities.
+.Sh RETURN VALUES
+Since
+.Fn getpriority
+can legitimately return the value -1, it is necessary
+to clear the external variable
+.Va errno
+prior to the
+call, then check it afterward to determine
+if a -1 is an error or a legitimate value.
+.Pp
+.Rv -std setpriority
+.Sh ERRORS
+The
+.Fn getpriority
+and
+.Fn setpriority
+system calls
+will fail if:
+.Bl -tag -width Er
+.It Bq Er ESRCH
+No process was located using the
+.Fa which
+and
+.Fa who
+values specified.
+.It Bq Er EINVAL
+The
+.Fa which
+argument
+was not one of
+.Dv PRIO_PROCESS ,
+.Dv PRIO_PGRP ,
+or
+.Dv PRIO_USER .
+.El
+.Pp
+.Bl -tag -width Er
+In addition to the errors indicated above,
+.Fn setpriority
+will fail if:
+.It Bq Er EPERM
+A process was located, but neither its effective nor real user
+ID matched the effective user ID of the caller.
+.It Bq Er EACCES
+A non super-user attempted to lower a process priority.
+.El
+.Sh SEE ALSO
+.Xr nice 1 ,
+.Xr fork 2 ,
+.Xr renice 8
+.Sh HISTORY
+The
+.Fn getpriority
+system call appeared in
+.Bx 4.2 .
diff --git a/lib/libc/sys/getrlimit.2 b/lib/libc/sys/getrlimit.2
new file mode 100644
index 0000000..35198bc
--- /dev/null
+++ b/lib/libc/sys/getrlimit.2
@@ -0,0 +1,203 @@
+.\" Copyright (c) 1980, 1991, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"     @(#)getrlimit.2	8.1 (Berkeley) 6/4/93
+.\" $FreeBSD$
+.\"
+.Dd August 20, 2008
+.Dt GETRLIMIT 2
+.Os
+.Sh NAME
+.Nm getrlimit ,
+.Nm setrlimit
+.Nd control maximum system resource consumption
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In sys/types.h
+.In sys/time.h
+.In sys/resource.h
+.Ft int
+.Fn getrlimit "int resource" "struct rlimit *rlp"
+.Ft int
+.Fn setrlimit "int resource" "const struct rlimit *rlp"
+.Sh DESCRIPTION
+Limits on the consumption of system resources by the current process
+and each process it creates may be obtained with the
+.Fn getrlimit
+system call, and set with the
+.Fn setrlimit
+system call.
+.Pp
+The
+.Fa resource
+argument is one of the following:
+.Bl -tag -width RLIMIT_FSIZEAA
+.It Dv RLIMIT_AS
+The maximum amount (in bytes) of virtual memory the process is
+allowed to map.
+.It Dv RLIMIT_CORE
+The largest size (in bytes)
+.Xr core 5
+file that may be created.
+.It Dv RLIMIT_CPU
+The maximum amount of cpu time (in seconds) to be used by
+each process.
+.It Dv RLIMIT_DATA
+The maximum size (in bytes) of the data segment for a process;
+this defines how far a program may extend its break with the
+.Xr sbrk 2
+function.
+.It Dv RLIMIT_FSIZE
+The largest size (in bytes) file that may be created.
+.It Dv RLIMIT_MEMLOCK
+The maximum size (in bytes) which a process may lock into memory
+using the
+.Xr mlock 2
+system call.
+.It Dv RLIMIT_NOFILE
+The maximum number of open files for this process.
+.It Dv RLIMIT_NPROC
+The maximum number of simultaneous processes for this user id.
+.It Dv RLIMIT_RSS
+The maximum size (in bytes) to which a process's resident set size may
+grow.
+This imposes a limit on the amount of physical memory to be given to
+a process; if memory is tight, the system will prefer to take memory
+from processes that are exceeding their declared resident set size.
+.It Dv RLIMIT_SBSIZE
+The maximum size (in bytes) of socket buffer usage for this user.
+This limits the amount of network memory, and hence the amount of
+mbufs, that this user may hold at any time.
+.It Dv RLIMIT_STACK
+The maximum size (in bytes) of the stack segment for a process;
+this defines how far a program's stack segment may be extended.
+Stack extension is performed automatically by the system.
+.It Dv RLIMIT_SWAP
+The maximum size (in bytes) of the swap space that may be reserved or
+used by all of this user id's processes.
+This limit is enforced only if bit 1 of the
+.Va vm.overcommit
+sysctl is set.
+Please see
+.Xr tuning 7
+for a complete description of this sysctl.
+.It Dv RLIMIT_NPTS
+The maximum number of pseudo-terminals created by this user id.
+.El
+.Pp
+A resource limit is specified as a soft limit and a hard limit.
+When a
+soft limit is exceeded a process may receive a signal (for example, if
+the cpu time or file size is exceeded), but it will be allowed to
+continue execution until it reaches the hard limit (or modifies
+its resource limit).
+The
+.Vt rlimit
+structure is used to specify the hard and soft limits on a resource,
+.Bd -literal -offset indent
+struct rlimit {
+	rlim_t	rlim_cur;	/* current (soft) limit */
+	rlim_t	rlim_max;	/* maximum value for rlim_cur */
+};
+.Ed
+.Pp
+Only the super-user may raise the maximum limits.
+Other users
+may only alter
+.Fa rlim_cur
+within the range from 0 to
+.Fa rlim_max
+or (irreversibly) lower
+.Fa rlim_max .
+.Pp
+An
+.Dq infinite
+value for a limit is defined as
+.Dv RLIM_INFINITY .
+.Pp
+Because this information is stored in the per-process information,
+this system call must be executed directly by the shell if it
+is to affect all future processes created by the shell;
+.Ic limit
+is thus a built-in command to
+.Xr csh 1 .
+.Pp
+The system refuses to extend the data or stack space when the limits
+would be exceeded in the normal way: a
+.Xr brk 2
+function fails if the data space limit is reached.
+When the stack limit is reached, the process receives
+a segmentation fault
+.Pq Dv SIGSEGV ;
+if this signal is not
+caught by a handler using the signal stack, this signal
+will kill the process.
+.Pp
+A file I/O operation that would create a file larger that the process'
+soft limit will cause the write to fail and a signal
+.Dv SIGXFSZ
+to be
+generated; this normally terminates the process, but may be caught.
+When
+the soft cpu time limit is exceeded, a signal
+.Dv SIGXCPU
+is sent to the
+offending process.
+.Sh RETURN VALUES
+.Rv -std
+.Sh ERRORS
+The
+.Fn getrlimit
+and
+.Fn setrlimit
+system calls
+will fail if:
+.Bl -tag -width Er
+.It Bq Er EFAULT
+The address specified for
+.Fa rlp
+is invalid.
+.It Bq Er EPERM
+The limit specified to
+.Fn setrlimit
+would have
+raised the maximum limit value, and the caller is not the super-user.
+.El
+.Sh SEE ALSO
+.Xr csh 1 ,
+.Xr quota 1 ,
+.Xr quotactl 2 ,
+.Xr sigaltstack 2 ,
+.Xr sigaction 2 ,
+.Xr sysctl 3 ,
+.Xr ulimit 3
+.Sh HISTORY
+The
+.Fn getrlimit
+system call appeared in
+.Bx 4.2 .
diff --git a/lib/libc/sys/getrusage.2 b/lib/libc/sys/getrusage.2
new file mode 100644
index 0000000..45ded18
--- /dev/null
+++ b/lib/libc/sys/getrusage.2
@@ -0,0 +1,186 @@
+.\" Copyright (c) 1985, 1991, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"     @(#)getrusage.2	8.1 (Berkeley) 6/4/93
+.\" $FreeBSD$
+.\"
+.Dd May 1, 2010
+.Dt GETRUSAGE 2
+.Os
+.Sh NAME
+.Nm getrusage
+.Nd get information about resource utilization
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In sys/types.h
+.In sys/time.h
+.In sys/resource.h
+.Fd "#define    RUSAGE_SELF      0"
+.Fd "#define    RUSAGE_CHILDREN -1"
+.Fd "#define    RUSAGE_THREAD   1"
+.Ft int
+.Fn getrusage "int who" "struct rusage *rusage"
+.Sh DESCRIPTION
+The
+.Fn getrusage
+system call
+returns information describing the resources utilized by the current
+thread, the current process, or all its terminated child processes.
+The
+.Fa who
+argument is either
+.Dv RUSAGE_THREAD ,
+.Dv RUSAGE_SELF ,
+or
+.Dv RUSAGE_CHILDREN .
+The buffer to which
+.Fa rusage
+points will be filled in with
+the following structure:
+.Bd -literal
+struct rusage {
+        struct timeval ru_utime; /* user time used */
+        struct timeval ru_stime; /* system time used */
+        long ru_maxrss;          /* max resident set size */
+        long ru_ixrss;           /* integral shared text memory size */
+        long ru_idrss;           /* integral unshared data size */
+        long ru_isrss;           /* integral unshared stack size */
+        long ru_minflt;          /* page reclaims */
+        long ru_majflt;          /* page faults */
+        long ru_nswap;           /* swaps */
+        long ru_inblock;         /* block input operations */
+        long ru_oublock;         /* block output operations */
+        long ru_msgsnd;          /* messages sent */
+        long ru_msgrcv;          /* messages received */
+        long ru_nsignals;        /* signals received */
+        long ru_nvcsw;           /* voluntary context switches */
+        long ru_nivcsw;          /* involuntary context switches */
+};
+.Ed
+.Pp
+The fields are interpreted as follows:
+.Bl -tag -width ru_minfltaa
+.It Fa ru_utime
+the total amount of time spent executing in user mode.
+.It Fa ru_stime
+the total amount of time spent in the system executing on behalf
+of the process(es).
+.It Fa ru_maxrss
+the maximum resident set size utilized (in kilobytes).
+.It Fa ru_ixrss
+an
+.Dq integral
+value indicating the amount of memory used
+by the text segment
+that was also shared among other processes.
+This value is expressed
+in units of kilobytes * ticks-of-execution.
+Ticks are statistics clock ticks.
+The statistics clock has a frequency of
+.Fn sysconf _SC_CLK_TCK
+ticks per second.
+.It Fa ru_idrss
+an integral value of the amount of unshared memory residing in the
+data segment of a process (expressed in units of
+kilobytes * ticks-of-execution).
+.It Fa ru_isrss
+an integral value of the amount of unshared memory residing in the
+stack segment of a process (expressed in units of
+kilobytes * ticks-of-execution).
+.It Fa ru_minflt
+the number of page faults serviced without any I/O activity; here
+I/O activity is avoided by
+.Dq reclaiming
+a page frame from
+the list of pages awaiting reallocation.
+.It Fa ru_majflt
+the number of page faults serviced that required I/O activity.
+.It Fa ru_nswap
+the number of times a process was
+.Dq swapped
+out of main
+memory.
+.It Fa ru_inblock
+the number of times the file system had to perform input.
+.It Fa ru_oublock
+the number of times the file system had to perform output.
+.It Fa ru_msgsnd
+the number of IPC messages sent.
+.It Fa ru_msgrcv
+the number of IPC messages received.
+.It Fa ru_nsignals
+the number of signals delivered.
+.It Fa ru_nvcsw
+the number of times a context switch resulted due to a process
+voluntarily giving up the processor before its time slice was
+completed (usually to await availability of a resource).
+.It Fa ru_nivcsw
+the number of times a context switch resulted due to a higher
+priority process becoming runnable or because the current process
+exceeded its time slice.
+.El
+.Sh NOTES
+The numbers
+.Fa ru_inblock
+and
+.Fa ru_oublock
+account only for real
+I/O; data supplied by the caching mechanism is charged only
+to the first process to read or write the data.
+.Sh RETURN VALUES
+.Rv -std getrusage
+.Sh ERRORS
+The
+.Fn getrusage
+system call will fail if:
+.Bl -tag -width Er
+.It Bq Er EINVAL
+The
+.Fa who
+argument is not a valid value.
+.It Bq Er EFAULT
+The address specified by the
+.Fa rusage
+argument is not in a valid part of the process address space.
+.El
+.Sh SEE ALSO
+.Xr gettimeofday 2 ,
+.Xr wait 2 ,
+.Xr clocks 7
+.Sh HISTORY
+The
+.Fn getrusage
+system call appeared in
+.Bx 4.2 .
+The
+.Dv RUSAGE_THREAD
+facility first appeared in
+.Fx 8.1 .
+.Sh BUGS
+There is no way to obtain information about a child process
+that has not yet terminated.
diff --git a/lib/libc/sys/getsid.2 b/lib/libc/sys/getsid.2
new file mode 100644
index 0000000..8d31074
--- /dev/null
+++ b/lib/libc/sys/getsid.2
@@ -0,0 +1,82 @@
+.\" Copyright (c) 1997 Peter Wemm <peter@FreeBSD.org>
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd August 19, 1997
+.Dt GETSID 2
+.Os
+.Sh NAME
+.Nm getsid
+.Nd get process session
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In unistd.h
+.Ft pid_t
+.Fn getsid "pid_t pid"
+.Sh DESCRIPTION
+The session ID of the process identified by
+.Fa pid
+is returned by
+.Fn getsid .
+If
+.Fa pid
+is zero,
+.Fn getsid
+returns the session ID of the current process.
+.Sh RETURN VALUES
+Upon successful completion, the
+.Fn getsid
+system call
+returns the session ID of
+the specified process; otherwise, it returns a value of -1 and
+sets errno to indicate an error.
+.Sh ERRORS
+The
+.Fn getsid
+system call
+will succeed unless:
+.Bl -tag -width Er
+.It Bq Er ESRCH
+if there is no process with a process ID equal to
+.Fa pid .
+.El
+.Pp
+Note that an implementation may restrict this system call to
+processes within the same session ID as the calling process.
+.Sh SEE ALSO
+.Xr getpgid 2 ,
+.Xr getpgrp 2 ,
+.Xr setpgid 2 ,
+.Xr setsid 2 ,
+.Xr termios 4
+.Sh HISTORY
+The
+.Fn getsid
+system call appeared in
+.Fx 3.0 .
+The
+.Fn getsid
+system call is derived from its usage in
+.At V .
diff --git a/lib/libc/sys/getsockname.2 b/lib/libc/sys/getsockname.2
new file mode 100644
index 0000000..f1537c7
--- /dev/null
+++ b/lib/libc/sys/getsockname.2
@@ -0,0 +1,94 @@
+.\" Copyright (c) 1983, 1991, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"     @(#)getsockname.2	8.1 (Berkeley) 6/4/93
+.\" $FreeBSD$
+.\"
+.Dd June 4, 1993
+.Dt GETSOCKNAME 2
+.Os
+.Sh NAME
+.Nm getsockname
+.Nd get socket name
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In sys/types.h
+.In sys/socket.h
+.Ft int
+.Fn getsockname "int s" "struct sockaddr * restrict name" "socklen_t * restrict namelen"
+.Sh DESCRIPTION
+The
+.Fn getsockname
+system call
+returns the current
+.Fa name
+for the specified socket.
+The
+.Fa namelen
+argument should be initialized to indicate
+the amount of space pointed to by
+.Fa name .
+On return it contains the actual size of the name
+returned (in bytes).
+.Sh RETURN VALUES
+.Rv -std getsockname
+.Sh ERRORS
+The call succeeds unless:
+.Bl -tag -width Er
+.It Bq Er EBADF
+The argument
+.Fa s
+is not a valid descriptor.
+.It Bq Er ECONNRESET
+The connection has been reset by the peer.
+.It Bq Er ENOTSOCK
+The argument
+.Fa s
+is a file, not a socket.
+.It Bq Er ENOBUFS
+Insufficient resources were available in the system
+to perform the operation.
+.It Bq Er EFAULT
+The
+.Fa name
+argument points to memory not in a valid part of the
+process address space.
+.El
+.Sh SEE ALSO
+.Xr bind 2 ,
+.Xr getpeername 2 ,
+.Xr socket 2
+.Sh HISTORY
+The
+.Fn getsockname
+system call appeared in
+.Bx 4.2 .
+.Sh BUGS
+Names bound to sockets in the UNIX domain are inaccessible;
+.Fn getsockname
+returns a zero length name.
diff --git a/lib/libc/sys/getsockopt.2 b/lib/libc/sys/getsockopt.2
new file mode 100644
index 0000000..d3472d0
--- /dev/null
+++ b/lib/libc/sys/getsockopt.2
@@ -0,0 +1,521 @@
+.\" Copyright (c) 1983, 1991, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"     @(#)getsockopt.2	8.4 (Berkeley) 5/2/95
+.\" $FreeBSD$
+.\"
+.Dd June 13, 2008
+.Dt GETSOCKOPT 2
+.Os
+.Sh NAME
+.Nm getsockopt ,
+.Nm setsockopt
+.Nd get and set options on sockets
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In sys/types.h
+.In sys/socket.h
+.Ft int
+.Fn getsockopt "int s" "int level" "int optname" "void * restrict optval" "socklen_t * restrict optlen"
+.Ft int
+.Fn setsockopt "int s" "int level" "int optname" "const void *optval" "socklen_t optlen"
+.Sh DESCRIPTION
+The
+.Fn getsockopt
+and
+.Fn setsockopt
+system calls
+manipulate the
+.Em options
+associated with a socket.
+Options may exist at multiple
+protocol levels; they are always present at the uppermost
+.Dq socket
+level.
+.Pp
+When manipulating socket options the level at which the
+option resides and the name of the option must be specified.
+To manipulate options at the socket level,
+.Fa level
+is specified as
+.Dv SOL_SOCKET .
+To manipulate options at any
+other level the protocol number of the appropriate protocol
+controlling the option is supplied.
+For example,
+to indicate that an option is to be interpreted by the
+.Tn TCP
+protocol,
+.Fa level
+should be set to the protocol number of
+.Tn TCP ;
+see
+.Xr getprotoent 3 .
+.Pp
+The
+.Fa optval
+and
+.Fa optlen
+arguments
+are used to access option values for
+.Fn setsockopt .
+For
+.Fn getsockopt
+they identify a buffer in which the value for the
+requested option(s) are to be returned.
+For
+.Fn getsockopt ,
+.Fa optlen
+is a value-result argument, initially containing the
+size of the buffer pointed to by
+.Fa optval ,
+and modified on return to indicate the actual size of
+the value returned.
+If no option value is
+to be supplied or returned,
+.Fa optval
+may be NULL.
+.Pp
+The
+.Fa optname
+argument
+and any specified options are passed uninterpreted to the appropriate
+protocol module for interpretation.
+The include file
+.In sys/socket.h
+contains definitions for
+socket level options, described below.
+Options at other protocol levels vary in format and
+name; consult the appropriate entries in
+section
+4 of the manual.
+.Pp
+Most socket-level options utilize an
+.Vt int
+argument for
+.Fa optval .
+For
+.Fn setsockopt ,
+the argument should be non-zero to enable a boolean option,
+or zero if the option is to be disabled.
+.Dv SO_LINGER
+uses a
+.Vt "struct linger"
+argument, defined in
+.In sys/socket.h ,
+which specifies the desired state of the option and the
+linger interval (see below).
+.Dv SO_SNDTIMEO
+and
+.Dv SO_RCVTIMEO
+use a
+.Vt "struct timeval"
+argument, defined in
+.In sys/time.h .
+.Pp
+The following options are recognized at the socket level.
+For protocol-specific options, see protocol manual pages,
+e.g.
+.Xr ip 4
+or
+.Xr tcp 4 .
+Except as noted, each may be examined with
+.Fn getsockopt
+and set with
+.Fn setsockopt .
+.Bl -column SO_ACCEPTFILTER -offset indent
+.It Dv SO_DEBUG Ta "enables recording of debugging information"
+.It Dv SO_REUSEADDR Ta "enables local address reuse"
+.It Dv SO_REUSEPORT Ta "enables duplicate address and port bindings"
+.It Dv SO_KEEPALIVE Ta "enables keep connections alive"
+.It Dv SO_DONTROUTE Ta "enables routing bypass for outgoing messages"
+.It Dv SO_LINGER  Ta "linger on close if data present"
+.It Dv SO_BROADCAST Ta "enables permission to transmit broadcast messages"
+.It Dv SO_OOBINLINE Ta "enables reception of out-of-band data in band"
+.It Dv SO_SNDBUF Ta "set buffer size for output"
+.It Dv SO_RCVBUF Ta "set buffer size for input"
+.It Dv SO_SNDLOWAT Ta "set minimum count for output"
+.It Dv SO_RCVLOWAT Ta "set minimum count for input"
+.It Dv SO_SNDTIMEO Ta "set timeout value for output"
+.It Dv SO_RCVTIMEO Ta "set timeout value for input"
+.It Dv SO_ACCEPTFILTER Ta "set accept filter on listening socket"
+.It Dv SO_NOSIGPIPE Ta
+controls generation of
+.Dv SIGPIPE
+for the socket
+.It Dv SO_TIMESTAMP Ta "enables reception of a timestamp with datagrams"
+.It Dv SO_BINTIME Ta "enables reception of a timestamp with datagrams"
+.It Dv SO_ACCEPTCONN Ta "get listening status of the socket (get only)"
+.It Dv SO_TYPE Ta "get the type of the socket (get only)"
+.It Dv SO_ERROR Ta "get and clear error on the socket (get only)"
+.It Dv SO_SETFIB Ta "set the associated FIB (routing table) for the socket (set only)"
+.El
+.Pp
+The following options are recognized in
+.Fx :
+.Bl -column SO_LISTENINCQLEN -offset indent
+.It Dv SO_LABEL Ta "get MAC label of the socket (get only)"
+.It Dv SO_PEERLABEL Ta "get socket's peer's MAC label (get only)"
+.It Dv SO_LISTENQLIMIT Ta "get backlog limit of the socket (get only)"
+.It Dv SO_LISTENQLEN Ta "get complete queue length of the socket (get only)"
+.It Dv SO_LISTENINCQLEN Ta "get incomplete queue length of the socket (get only)"
+.El
+.Pp
+.Dv SO_DEBUG
+enables debugging in the underlying protocol modules.
+.Dv SO_REUSEADDR
+indicates that the rules used in validating addresses supplied
+in a
+.Xr bind 2
+system call should allow reuse of local addresses.
+.Dv SO_REUSEPORT
+allows completely duplicate bindings by multiple processes
+if they all set
+.Dv SO_REUSEPORT
+before binding the port.
+This option permits multiple instances of a program to each
+receive UDP/IP multicast or broadcast datagrams destined for the bound port.
+.Dv SO_KEEPALIVE
+enables the
+periodic transmission of messages on a connected socket.
+Should the
+connected party fail to respond to these messages, the connection is
+considered broken and processes using the socket are notified via a
+.Dv SIGPIPE
+signal when attempting to send data.
+.Dv SO_DONTROUTE
+indicates that outgoing messages should
+bypass the standard routing facilities.
+Instead, messages are directed
+to the appropriate network interface according to the network portion
+of the destination address.
+.Pp
+.Dv SO_LINGER
+controls the action taken when unsent messages
+are queued on socket and a
+.Xr close 2
+is performed.
+If the socket promises reliable delivery of data and
+.Dv SO_LINGER
+is set,
+the system will block the process on the
+.Xr close 2
+attempt until it is able to transmit the data or until it decides it
+is unable to deliver the information (a timeout period, termed the
+linger interval, is specified in seconds in the
+.Fn setsockopt
+system call when
+.Dv SO_LINGER
+is requested).
+If
+.Dv SO_LINGER
+is disabled and a
+.Xr close 2
+is issued, the system will process the close in a manner that allows
+the process to continue as quickly as possible.
+.Pp
+The option
+.Dv SO_BROADCAST
+requests permission to send broadcast datagrams
+on the socket.
+Broadcast was a privileged operation in earlier versions of the system.
+With protocols that support out-of-band data, the
+.Dv SO_OOBINLINE
+option
+requests that out-of-band data be placed in the normal data input queue
+as received; it will then be accessible with
+.Xr recv 2
+or
+.Xr read 2
+calls without the
+.Dv MSG_OOB
+flag.
+Some protocols always behave as if this option is set.
+.Dv SO_SNDBUF
+and
+.Dv SO_RCVBUF
+are options to adjust the normal
+buffer sizes allocated for output and input buffers, respectively.
+The buffer size may be increased for high-volume connections,
+or may be decreased to limit the possible backlog of incoming data.
+The system places an absolute maximum on these values, which is accessible
+through the
+.Xr sysctl 3
+MIB variable
+.Dq Li kern.ipc.maxsockbuf .
+.Pp
+.Dv SO_SNDLOWAT
+is an option to set the minimum count for output operations.
+Most output operations process all of the data supplied
+by the call, delivering data to the protocol for transmission
+and blocking as necessary for flow control.
+Nonblocking output operations will process as much data as permitted
+subject to flow control without blocking, but will process no data
+if flow control does not allow the smaller of the low water mark value
+or the entire request to be processed.
+A
+.Xr select 2
+operation testing the ability to write to a socket will return true
+only if the low water mark amount could be processed.
+The default value for
+.Dv SO_SNDLOWAT
+is set to a convenient size for network efficiency, often 1024.
+.Dv SO_RCVLOWAT
+is an option to set the minimum count for input operations.
+In general, receive calls will block until any (non-zero) amount of data
+is received, then return with the smaller of the amount available or the amount
+requested.
+The default value for
+.Dv SO_RCVLOWAT
+is 1.
+If
+.Dv SO_RCVLOWAT
+is set to a larger value, blocking receive calls normally
+wait until they have received the smaller of the low water mark value
+or the requested amount.
+Receive calls may still return less than the low water mark if an error
+occurs, a signal is caught, or the type of data next in the receive queue
+is different from that which was returned.
+.Pp
+.Dv SO_SNDTIMEO
+is an option to set a timeout value for output operations.
+It accepts a
+.Vt "struct timeval"
+argument with the number of seconds and microseconds
+used to limit waits for output operations to complete.
+If a send operation has blocked for this much time,
+it returns with a partial count
+or with the error
+.Er EWOULDBLOCK
+if no data were sent.
+In the current implementation, this timer is restarted each time additional
+data are delivered to the protocol,
+implying that the limit applies to output portions ranging in size
+from the low water mark to the high water mark for output.
+.Dv SO_RCVTIMEO
+is an option to set a timeout value for input operations.
+It accepts a
+.Vt "struct timeval"
+argument with the number of seconds and microseconds
+used to limit waits for input operations to complete.
+In the current implementation, this timer is restarted each time additional
+data are received by the protocol,
+and thus the limit is in effect an inactivity timer.
+If a receive operation has been blocked for this much time without
+receiving additional data, it returns with a short count
+or with the error
+.Er EWOULDBLOCK
+if no data were received.
+.Pp
+.Dv SO_SETFIB
+can be used to over-ride the default FIB (routing table) for the given socket.
+The value must be from 0 to one less than the number returned from
+the sysctl
+.Em net.fibs .
+.Pp
+.Dv SO_ACCEPTFILTER
+places an
+.Xr accept_filter 9
+on the socket,
+which will filter incoming connections
+on a listening stream socket before being presented for
+.Xr accept 2 .
+Once more,
+.Xr listen 2
+must be called on the socket before
+trying to install the filter on it,
+or else the
+.Fn setsockopt
+system call will fail.
+.Bd -literal
+struct  accept_filter_arg {
+        char    af_name[16];
+        char    af_arg[256-16];
+};
+.Ed
+.Pp
+The
+.Fa optval
+argument
+should point to a
+.Fa struct accept_filter_arg
+that will select and configure the
+.Xr accept_filter 9 .
+The
+.Fa af_name
+argument
+should be filled with the name of the accept filter
+that the application wishes to place on the listening socket.
+The optional argument
+.Fa af_arg
+can be passed to the accept
+filter specified by
+.Fa af_name
+to provide additional configuration options at attach time.
+Passing in an
+.Fa optval
+of NULL will remove the filter.
+.Pp
+The
+.Dv SO_NOSIGPIPE
+option controls generation of the
+.Dv SIGPIPE
+signal normally sent
+when writing to a connected socket where the other end has been
+closed returns with the error
+.Er EPIPE .
+.Pp
+If the
+.Dv SO_TIMESTAMP
+or
+.Dv SO_BINTIME
+option is enabled on a
+.Dv SOCK_DGRAM
+socket, the
+.Xr recvmsg 2
+call will return a timestamp corresponding to when the datagram was received.
+The
+.Va msg_control
+field in the
+.Vt msghdr
+structure points to a buffer that contains a
+.Vt cmsghdr
+structure followed by a
+.Vt "struct timeval"
+for
+.Dv SO_TIMESTAMP
+and
+.Vt "struct bintime"
+for
+.Dv SO_BINTIME .
+The
+.Vt cmsghdr
+fields have the following values for TIMESTAMP:
+.Bd -literal
+     cmsg_len = sizeof(struct timeval);
+     cmsg_level = SOL_SOCKET;
+     cmsg_type = SCM_TIMESTAMP;
+.Ed
+.Pp
+and for
+.Dv SO_BINTIME :
+.Bd -literal
+     cmsg_len = sizeof(struct bintime);
+     cmsg_level = SOL_SOCKET;
+     cmsg_type = SCM_BINTIME;
+.Ed
+.Pp
+.Dv SO_ACCEPTCONN ,
+.Dv SO_TYPE
+and
+.Dv SO_ERROR
+are options used only with
+.Fn getsockopt .
+.Dv SO_ACCEPTCONN
+returns whether the socket is currently accepting connections,
+that is, whether or not the
+.Xr listen 2
+system call was invoked on the socket.
+.Dv SO_TYPE
+returns the type of the socket, such as
+.Dv SOCK_STREAM ;
+it is useful for servers that inherit sockets on startup.
+.Dv SO_ERROR
+returns any pending error on the socket and clears
+the error status.
+It may be used to check for asynchronous errors on connected
+datagram sockets or for other asynchronous errors.
+.Pp
+Finally,
+.Dv SO_LABEL
+returns the MAC label of the socket.
+.Dv SO_PEERLABEL
+returns the MAC label of the socket's peer.
+Note that your kernel must be compiled with MAC support.
+See
+.Xr mac 3
+for more information.
+.Dv SO_LISTENQLIMIT
+returns the maximal number of queued connections, as set by
+.Xr listen 2 .
+.Dv SO_LISTENQLEN
+returns the number of unaccepted complete connections.
+.Dv SO_LISTENINCQLEN
+returns the number of unaccepted incomplete connections.
+.Sh RETURN VALUES
+.Rv -std
+.Sh ERRORS
+The call succeeds unless:
+.Bl -tag -width Er
+.It Bq Er EBADF
+The argument
+.Fa s
+is not a valid descriptor.
+.It Bq Er ENOTSOCK
+The argument
+.Fa s
+is a file, not a socket.
+.It Bq Er ENOPROTOOPT
+The option is unknown at the level indicated.
+.It Bq Er EFAULT
+The address pointed to by
+.Fa optval
+is not in a valid part of the process address space.
+For
+.Fn getsockopt ,
+this error may also be returned if
+.Fa optlen
+is not in a valid part of the process address space.
+.It Bq Er EINVAL
+Installing an
+.Xr accept_filter 9
+on a non-listening socket was attempted.
+.El
+.Sh SEE ALSO
+.Xr ioctl 2 ,
+.Xr listen 2 ,
+.Xr recvmsg 2 ,
+.Xr socket 2 ,
+.Xr getprotoent 3 ,
+.Xr mac 3 ,
+.Xr sysctl 3 ,
+.Xr ip 4 ,
+.Xr ip6 4 ,
+.Xr sctp 4 ,
+.Xr tcp 4 ,
+.Xr protocols 5 ,
+.Xr sysctl 8 ,
+.Xr accept_filter 9 ,
+.Xr bintime 9
+.Sh HISTORY
+The
+.Fn getsockopt
+system call appeared in
+.Bx 4.2 .
+.Sh BUGS
+Several of the socket options should be handled at lower levels of the system.
diff --git a/lib/libc/sys/gettimeofday.2 b/lib/libc/sys/gettimeofday.2
new file mode 100644
index 0000000..23cc059
--- /dev/null
+++ b/lib/libc/sys/gettimeofday.2
@@ -0,0 +1,130 @@
+.\" Copyright (c) 1980, 1991, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"     @(#)gettimeofday.2	8.2 (Berkeley) 5/26/95
+.\" $FreeBSD$
+.\"
+.Dd May 26, 1995
+.Dt GETTIMEOFDAY 2
+.Os
+.Sh NAME
+.Nm gettimeofday ,
+.Nm settimeofday
+.Nd get/set date and time
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In sys/time.h
+.Ft int
+.Fn gettimeofday "struct timeval *tp" "struct timezone *tzp"
+.Ft int
+.Fn settimeofday "const struct timeval *tp" "const struct timezone *tzp"
+.Sh DESCRIPTION
+.Bf -symbolic
+Note: timezone is no longer used; this information is kept outside
+the kernel.
+.Ef
+.Pp
+The system's notion of the current Greenwich time and the current time
+zone is obtained with the
+.Fn gettimeofday
+system call, and set with the
+.Fn settimeofday
+system call.
+The time is expressed in seconds and microseconds
+since midnight (0 hour), January 1, 1970.
+The resolution of the system
+clock is hardware dependent, and the time may be updated continuously or
+in
+.Dq ticks .
+If
+.Fa tp
+or
+.Fa tzp
+is NULL, the associated time
+information will not be returned or set.
+.Pp
+The structures pointed to by
+.Fa tp
+and
+.Fa tzp
+are defined in
+.In sys/time.h
+as:
+.Bd -literal
+struct timeval {
+	time_t		tv_sec;		/* seconds */
+	suseconds_t	tv_usec;	/* and microseconds */
+};
+
+struct timezone {
+	int	tz_minuteswest; /* minutes west of Greenwich */
+	int	tz_dsttime;	/* type of dst correction */
+};
+.Ed
+.Pp
+The
+.Vt timezone
+structure indicates the local time zone
+(measured in minutes of time westward from Greenwich),
+and a flag that, if nonzero, indicates that
+Daylight Saving time applies locally during
+the appropriate part of the year.
+.Pp
+Only the super-user may set the time of day or time zone.
+If the system is running at securelevel >= 2 (see
+.Xr init 8 ) ,
+the time may only be advanced or retarded by a maximum of one second.
+This limitation is imposed to prevent a malicious super-user
+from setting arbitrary time stamps on files.
+The system time can be adjusted backwards without restriction using the
+.Xr adjtime 2
+system call even when the system is secure.
+.Sh RETURN VALUES
+.Rv -std
+.Sh ERRORS
+The following error codes may be set in
+.Va errno :
+.Bl -tag -width Er
+.It Bq Er EFAULT
+An argument address referenced invalid memory.
+.It Bq Er EPERM
+A user other than the super-user attempted to set the time.
+.El
+.Sh SEE ALSO
+.Xr date 1 ,
+.Xr adjtime 2 ,
+.Xr clock_gettime 2 ,
+.Xr ctime 3 ,
+.Xr timeradd 3 ,
+.Xr clocks 7 ,
+.Xr timed 8
+.Sh HISTORY
+The
+.Fn gettimeofday
+system call appeared in
+.Bx 4.2 .
diff --git a/lib/libc/sys/getuid.2 b/lib/libc/sys/getuid.2
new file mode 100644
index 0000000..eae0b23
--- /dev/null
+++ b/lib/libc/sys/getuid.2
@@ -0,0 +1,90 @@
+.\" Copyright (c) 1980, 1991, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"     @(#)getuid.2	8.1 (Berkeley) 6/4/93
+.\" $FreeBSD$
+.\"
+.Dd June 4, 1993
+.Dt GETUID 2
+.Os
+.Sh NAME
+.Nm getuid ,
+.Nm geteuid
+.Nd get user identification
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In unistd.h
+.In sys/types.h
+.Ft uid_t
+.Fn getuid void
+.Ft uid_t
+.Fn geteuid void
+.Sh DESCRIPTION
+The
+.Fn getuid
+system call returns the real user ID of the calling process.
+The
+.Fn geteuid
+system call
+returns the effective user ID of the calling process.
+.Pp
+The real user ID is that of the user who has invoked the program.
+As the effective user ID
+gives the process additional permissions during
+execution of
+.Dq Em set-user-ID
+mode processes,
+.Fn getuid
+is used to determine the real-user-id of the calling process.
+.Sh ERRORS
+The
+.Fn getuid
+and
+.Fn geteuid
+system calls are always successful, and no return value is reserved to
+indicate an error.
+.Sh SEE ALSO
+.Xr getgid 2 ,
+.Xr issetugid 2 ,
+.Xr setgid 2 ,
+.Xr setreuid 2 ,
+.Xr setuid 2
+.Sh STANDARDS
+The
+.Fn geteuid
+and
+.Fn getuid
+system calls are expected to conform to
+.St -p1003.1-90 .
+.Sh HISTORY
+The
+.Fn getuid
+and
+.Fn geteuid
+functions appeared in
+.At v7 .
diff --git a/lib/libc/sys/intro.2 b/lib/libc/sys/intro.2
new file mode 100644
index 0000000..e5ff9df
--- /dev/null
+++ b/lib/libc/sys/intro.2
@@ -0,0 +1,746 @@
+.\" Copyright (c) 1980, 1983, 1986, 1991, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"     @(#)intro.2	8.5 (Berkeley) 2/27/95
+.\" $FreeBSD$
+.\"
+.Dd February 27, 1995
+.Dt INTRO 2
+.Os
+.Sh NAME
+.Nm intro
+.Nd introduction to system calls and error numbers
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In errno.h
+.Sh DESCRIPTION
+This section provides an overview of the system calls,
+their error returns, and other common definitions and concepts.
+.\".Pp
+.\".Sy System call restart
+.\".Pp
+.\"(more later...)
+.Sh RETURN VALUES
+Nearly all of the system calls provide an error number referenced via
+the external identifier errno.
+This identifier is defined in
+.In sys/errno.h
+as
+.Pp
+.Dl extern    int *       __error();
+.Dl #define   errno       (* __error())
+.Pp
+The
+.Va __error()
+function returns a pointer to a field in the thread specific structure for
+threads other than the initial thread.
+For the initial thread and
+non-threaded processes,
+.Va __error()
+returns a pointer to a global
+.Va errno
+variable that is compatible with the previous definition.
+.Pp
+When a system call detects an error,
+it returns an integer value
+indicating failure (usually -1)
+and sets the variable
+.Va errno
+accordingly.
+(This allows interpretation of the failure on receiving
+a -1 and to take action accordingly.)
+Successful calls never set
+.Va errno ;
+once set, it remains until another error occurs.
+It should only be examined after an error.
+Note that a number of system calls overload the meanings of these
+error numbers, and that the meanings must be interpreted according
+to the type and circumstances of the call.
+.Pp
+The following is a complete list of the errors and their
+names as given in
+.In sys/errno.h .
+.Bl -hang -width Ds
+.It Er 0 Em "Undefined error: 0" .
+Not used.
+.It Er 1 EPERM Em "Operation not permitted" .
+An attempt was made to perform an operation limited to processes
+with appropriate privileges or to the owner of a file or other
+resources.
+.It Er 2 ENOENT Em "No such file or directory" .
+A component of a specified pathname did not exist, or the
+pathname was an empty string.
+.It Er 3 ESRCH Em "No such process" .
+No process could be found corresponding to that specified by the given
+process ID.
+.It Er 4 EINTR Em "Interrupted system call" .
+An asynchronous signal (such as
+.Dv SIGINT
+or
+.Dv SIGQUIT )
+was caught by the process during the execution of an interruptible
+function.
+If the signal handler performs a normal return, the
+interrupted system call will seem to have returned the error condition.
+.It Er 5 EIO Em "Input/output error" .
+Some physical input or output error occurred.
+This error will not be reported until a subsequent operation on the same file
+descriptor and may be lost (over written) by any subsequent errors.
+.It Er 6 ENXIO Em "Device not configured" .
+Input or output on a special file referred to a device that did not
+exist, or
+made a request beyond the limits of the device.
+This error may also occur when, for example,
+a tape drive is not online or no disk pack is
+loaded on a drive.
+.It Er 7 E2BIG Em "Argument list too long" .
+The number of bytes used for the argument and environment
+list of the new process exceeded the current limit
+.Dv ( NCARGS
+in
+.In sys/param.h ) .
+.It Er 8 ENOEXEC Em "Exec format error" .
+A request was made to execute a file
+that, although it has the appropriate permissions,
+was not in the format required for an
+executable file.
+.It Er 9 EBADF Em "Bad file descriptor" .
+A file descriptor argument was out of range, referred to no open file,
+or a read (write) request was made to a file that was only open for
+writing (reading).
+.Pp
+.It Er 10 ECHILD Em "\&No child processes" .
+A
+.Xr wait 2
+or
+.Xr waitpid 2
+function was executed by a process that had no existing or unwaited-for
+child processes.
+.It Er 11 EDEADLK Em "Resource deadlock avoided" .
+An attempt was made to lock a system resource that
+would have resulted in a deadlock situation.
+.It Er 12 ENOMEM Em "Cannot allocate memory" .
+The new process image required more memory than was allowed by the hardware
+or by system-imposed memory management constraints.
+A lack of swap space is normally temporary; however,
+a lack of core is not.
+Soft limits may be increased to their corresponding hard limits.
+.It Er 13 EACCES Em "Permission denied" .
+An attempt was made to access a file in a way forbidden
+by its file access permissions.
+.It Er 14 EFAULT Em "Bad address" .
+The system detected an invalid address in attempting to
+use an argument of a call.
+.It Er 15 ENOTBLK Em "Block device required" .
+A block device operation was attempted on a non-block device or file.
+.It Er 16 EBUSY Em "Device busy" .
+An attempt to use a system resource which was in use at the time
+in a manner which would have conflicted with the request.
+.It Er 17 EEXIST Em "File exists" .
+An existing file was mentioned in an inappropriate context,
+for instance, as the new link name in a
+.Xr link 2
+system call.
+.It Er 18 EXDEV Em "Cross-device link" .
+A hard link to a file on another file system
+was attempted.
+.It Er 19 ENODEV Em "Operation not supported by device" .
+An attempt was made to apply an inappropriate
+function to a device,
+for example,
+trying to read a write-only device such as a printer.
+.It Er 20 ENOTDIR Em "Not a directory" .
+A component of the specified pathname existed, but it was
+not a directory, when a directory was expected.
+.It Er 21 EISDIR Em "Is a directory" .
+An attempt was made to open a directory with write mode specified.
+.It Er 22 EINVAL Em "Invalid argument" .
+Some invalid argument was supplied.
+(For example,
+specifying an undefined signal to a
+.Xr signal 3
+function
+or a
+.Xr kill 2
+system call).
+.It Er 23 ENFILE Em "Too many open files in system" .
+Maximum number of file descriptors allowable on the system
+has been reached and a requests for an open cannot be satisfied
+until at least one has been closed.
+.It Er 24 EMFILE Em "Too many open files" .
+(As released, the limit on the number of
+open files per process is 64.)
+The
+.Xr getdtablesize 2
+system call will obtain the current limit.
+.It Er 25 ENOTTY Em "Inappropriate ioctl for device" .
+A control function (see
+.Xr ioctl 2 )
+was attempted for a file or
+special device for which the operation was inappropriate.
+.It Er 26 ETXTBSY Em "Text file busy" .
+The new process was a pure procedure (shared text) file
+which was open for writing by another process, or
+while the pure procedure file was being executed an
+.Xr open 2
+call requested write access.
+.It Er 27 EFBIG Em "File too large" .
+The size of a file exceeded the maximum.
+.It Er 28 ENOSPC Em "No space left on device" .
+A
+.Xr write 2
+to an ordinary file, the creation of a
+directory or symbolic link, or the creation of a directory
+entry failed because no more disk blocks were available
+on the file system, or the allocation of an inode for a newly
+created file failed because no more inodes were available
+on the file system.
+.It Er 29 ESPIPE Em "Illegal seek" .
+An
+.Xr lseek 2
+system call was issued on a socket, pipe or
+.Tn FIFO .
+.It Er 30 EROFS Em "Read-only file system" .
+An attempt was made to modify a file or directory
+on a file system that was read-only at the time.
+.It Er 31 EMLINK Em "Too many links" .
+Maximum allowable hard links to a single file has been exceeded (limit
+of 32767 hard links per file).
+.It Er 32 EPIPE Em "Broken pipe" .
+A write on a pipe, socket or
+.Tn FIFO
+for which there is no process
+to read the data.
+.It Er 33 EDOM Em "Numerical argument out of domain" .
+A numerical input argument was outside the defined domain of the mathematical
+function.
+.It Er 34 ERANGE Em "Result too large" .
+A numerical result of the function was too large to fit in the
+available space (perhaps exceeded precision).
+.It Er 35 EAGAIN Em "Resource temporarily unavailable" .
+This is a temporary condition and later calls to the
+same routine may complete normally.
+.It Er 36 EINPROGRESS Em "Operation now in progress" .
+An operation that takes a long time to complete (such as
+a
+.Xr connect 2 )
+was attempted on a non-blocking object (see
+.Xr fcntl 2 ) .
+.It Er 37 EALREADY Em "Operation already in progress" .
+An operation was attempted on a non-blocking object that already
+had an operation in progress.
+.It Er 38 ENOTSOCK Em "Socket operation on non-socket" .
+Self-explanatory.
+.It Er 39 EDESTADDRREQ Em "Destination address required" .
+A required address was omitted from an operation on a socket.
+.It Er 40 EMSGSIZE Em "Message too long" .
+A message sent on a socket was larger than the internal message buffer
+or some other network limit.
+.It Er 41 EPROTOTYPE Em "Protocol wrong type for socket" .
+A protocol was specified that does not support the semantics of the
+socket type requested.
+For example, you cannot use the
+.Tn ARPA
+Internet
+.Tn UDP
+protocol with type
+.Dv SOCK_STREAM .
+.It Er 42 ENOPROTOOPT Em "Protocol not available" .
+A bad option or level was specified in a
+.Xr getsockopt 2
+or
+.Xr setsockopt 2
+call.
+.It Er 43 EPROTONOSUPPORT Em "Protocol not supported" .
+The protocol has not been configured into the
+system or no implementation for it exists.
+.It Er 44 ESOCKTNOSUPPORT Em "Socket type not supported" .
+The support for the socket type has not been configured into the
+system or no implementation for it exists.
+.It Er 45 EOPNOTSUPP Em "Operation not supported" .
+The attempted operation is not supported for the type of object referenced.
+Usually this occurs when a file descriptor refers to a file or socket
+that cannot support this operation,
+for example, trying to
+.Em accept
+a connection on a datagram socket.
+.It Er 46 EPFNOSUPPORT Em "Protocol family not supported" .
+The protocol family has not been configured into the
+system or no implementation for it exists.
+.It Er 47 EAFNOSUPPORT Em "Address family not supported by protocol family" .
+An address incompatible with the requested protocol was used.
+For example, you should not necessarily expect to be able to use
+.Tn NS
+addresses with
+.Tn ARPA
+Internet protocols.
+.It Er 48 EADDRINUSE Em "Address already in use" .
+Only one usage of each address is normally permitted.
+.Pp
+.It Er 49 EADDRNOTAVAIL Em "Can't assign requested address" .
+Normally results from an attempt to create a socket with an
+address not on this machine.
+.It Er 50 ENETDOWN Em "Network is down" .
+A socket operation encountered a dead network.
+.It Er 51 ENETUNREACH Em "Network is unreachable" .
+A socket operation was attempted to an unreachable network.
+.It Er 52 ENETRESET Em "Network dropped connection on reset" .
+The host you were connected to crashed and rebooted.
+.It Er 53 ECONNABORTED Em "Software caused connection abort" .
+A connection abort was caused internal to your host machine.
+.It Er 54 ECONNRESET Em "Connection reset by peer" .
+A connection was forcibly closed by a peer.
+This normally
+results from a loss of the connection on the remote socket
+due to a timeout or a reboot.
+.It Er 55 ENOBUFS Em "\&No buffer space available" .
+An operation on a socket or pipe was not performed because
+the system lacked sufficient buffer space or because a queue was full.
+.It Er 56 EISCONN Em "Socket is already connected" .
+A
+.Xr connect 2
+request was made on an already connected socket; or,
+a
+.Xr sendto 2
+or
+.Xr sendmsg 2
+request on a connected socket specified a destination
+when already connected.
+.It Er 57 ENOTCONN Em "Socket is not connected" .
+An request to send or receive data was disallowed because
+the socket was not connected and (when sending on a datagram socket)
+no address was supplied.
+.It Er 58 ESHUTDOWN Em "Can't send after socket shutdown" .
+A request to send data was disallowed because the socket
+had already been shut down with a previous
+.Xr shutdown 2
+call.
+.It Er 60 ETIMEDOUT Em "Operation timed out" .
+A
+.Xr connect 2
+or
+.Xr send 2
+request failed because the connected party did not
+properly respond after a period of time.
+(The timeout
+period is dependent on the communication protocol.)
+.It Er 61 ECONNREFUSED Em "Connection refused" .
+No connection could be made because the target machine actively
+refused it.
+This usually results from trying to connect
+to a service that is inactive on the foreign host.
+.It Er 62 ELOOP Em "Too many levels of symbolic links" .
+A path name lookup involved more than 32
+.Pq Dv MAXSYMLINKS
+symbolic links.
+.It Er 63 ENAMETOOLONG Em "File name too long" .
+A component of a path name exceeded
+.Brq Dv NAME_MAX
+characters, or an entire
+path name exceeded
+.Brq Dv PATH_MAX
+characters.
+(See also the description of
+.Dv _PC_NO_TRUNC
+in
+.Xr pathconf 2 . )
+.It Er 64 EHOSTDOWN Em "Host is down" .
+A socket operation failed because the destination host was down.
+.It Er 65 EHOSTUNREACH Em "No route to host" .
+A socket operation was attempted to an unreachable host.
+.It Er 66 ENOTEMPTY Em "Directory not empty" .
+A directory with entries other than
+.Ql .\&
+and
+.Ql ..\&
+was supplied to a remove directory or rename call.
+.It Er 67 EPROCLIM Em "Too many processes" .
+.It Er 68 EUSERS Em "Too many users" .
+The quota system ran out of table entries.
+.It Er 69 EDQUOT Em "Disc quota exceeded" .
+A
+.Xr write 2
+to an ordinary file, the creation of a
+directory or symbolic link, or the creation of a directory
+entry failed because the user's quota of disk blocks was
+exhausted, or the allocation of an inode for a newly
+created file failed because the user's quota of inodes
+was exhausted.
+.It Er 70 ESTALE Em "Stale NFS file handle" .
+An attempt was made to access an open file (on an
+.Tn NFS
+file system)
+which is now unavailable as referenced by the file descriptor.
+This may indicate the file was deleted on the
+.Tn NFS
+server or some
+other catastrophic event occurred.
+.It Er 72 EBADRPC Em "RPC struct is bad" .
+Exchange of
+.Tn RPC
+information was unsuccessful.
+.It Er 73 ERPCMISMATCH Em "RPC version wrong" .
+The version of
+.Tn RPC
+on the remote peer is not compatible with
+the local version.
+.It Er 74 EPROGUNAVAIL Em "RPC prog. not avail" .
+The requested program is not registered on the remote host.
+.It Er 75 EPROGMISMATCH Em "Program version wrong" .
+The requested version of the program is not available
+on the remote host
+.Pq Tn RPC .
+.It Er 76 EPROCUNAVAIL Em "Bad procedure for program" .
+An
+.Tn RPC
+call was attempted for a procedure which does not exist
+in the remote program.
+.It Er 77 ENOLCK Em "No locks available" .
+A system-imposed limit on the number of simultaneous file
+locks was reached.
+.It Er 78 ENOSYS Em "Function not implemented" .
+Attempted a system call that is not available on this
+system.
+.It Er 79 EFTYPE Em "Inappropriate file type or format" .
+The file was the wrong type for the operation, or a data file had
+the wrong format.
+.It Er 80 EAUTH Em "Authentication error" .
+Attempted to use an invalid authentication ticket to mount a
+.Tn NFS
+file system.
+.It Er 81 ENEEDAUTH Em "Need authenticator" .
+An authentication ticket must be obtained before the given
+.Tn NFS
+file system may be mounted.
+.It Er 82 EIDRM Em "Identifier removed" .
+An IPC identifier was removed while the current process was waiting on it.
+.It Er 83 ENOMSG Em "No message of desired type" .
+An IPC message queue does not contain a message of the desired type, or a
+message catalog does not contain the requested message.
+.It Er 84 EOVERFLOW Em "Value too large to be stored in data type" .
+A numerical result of the function was too large to be stored in the caller
+provided space.
+.It Er 85 ECANCELED Em "Operation canceled" .
+The scheduled operation was canceled.
+.It Er 86 EILSEQ Em "Illegal byte sequence" .
+While decoding a multibyte character the function came along an
+invalid or an incomplete sequence of bytes or the given wide
+character is invalid.
+.It Er 87 ENOATTR Em "Attribute not found" .
+The specified extended attribute does not exist.
+.It Er 88 EDOOFUS Em "Programming error" .
+A function or API is being abused in a way which could only be detected
+at run-time.
+.It Er 89 EBADMSG Em "Bad message" .
+A corrupted message was detected.
+.It Er 90 EMULTIHOP Em "Multihop attempted" .
+This error code is unused, but present for compatibility with other systems.
+.It Er 91 ENOLINK Em "Link has been severed" .
+This error code is unused, but present for compatibility with other systems.
+.It Er 92 EPROTO Em "Protocol error" .
+A device or socket encountered an unrecoverable protocol error.
+.It Er 93 ENOTCAPABLE Em "Capabilities insufficient" .
+An operation on a capability file descriptor requires greater privilege than
+the capability allows.
+.El
+.Sh DEFINITIONS
+.Bl -tag -width Ds
+.It Process ID .
+Each active process in the system is uniquely identified by a non-negative
+integer called a process ID.
+The range of this ID is from 0 to 99999.
+.It Parent process ID
+A new process is created by a currently active process (see
+.Xr fork 2 ) .
+The parent process ID of a process is initially the process ID of its creator.
+If the creating process exits,
+the parent process ID of each child is set to the ID of a system process,
+.Xr init 8 .
+.It Process Group
+Each active process is a member of a process group that is identified by
+a non-negative integer called the process group ID.
+This is the process
+ID of the group leader.
+This grouping permits the signaling of related
+processes (see
+.Xr termios 4 )
+and the job control mechanisms of
+.Xr csh 1 .
+.It Session
+A session is a set of one or more process groups.
+A session is created by a successful call to
+.Xr setsid 2 ,
+which causes the caller to become the only member of the only process
+group in the new session.
+.It Session leader
+A process that has created a new session by a successful call to
+.Xr setsid 2 ,
+is known as a session leader.
+Only a session leader may acquire a terminal as its controlling terminal (see
+.Xr termios 4 ) .
+.It Controlling process
+A session leader with a controlling terminal is a controlling process.
+.It Controlling terminal
+A terminal that is associated with a session is known as the controlling
+terminal for that session and its members.
+.It "Terminal Process Group ID"
+A terminal may be acquired by a session leader as its controlling terminal.
+Once a terminal is associated with a session, any of the process groups
+within the session may be placed into the foreground by setting
+the terminal process group ID to the ID of the process group.
+This facility is used
+to arbitrate between multiple jobs contending for the same terminal;
+(see
+.Xr csh 1
+and
+.Xr tty 4 ) .
+.It "Orphaned Process Group"
+A process group is considered to be
+.Em orphaned
+if it is not under the control of a job control shell.
+More precisely, a process group is orphaned
+when none of its members has a parent process that is in the same session
+as the group,
+but is in a different process group.
+Note that when a process exits, the parent process for its children
+is changed to be
+.Xr init 8 ,
+which is in a separate session.
+Not all members of an orphaned process group are necessarily orphaned
+processes (those whose creating process has exited).
+The process group of a session leader is orphaned by definition.
+.It "Real User ID and Real Group ID"
+Each user on the system is identified by a positive integer
+termed the real user ID.
+.Pp
+Each user is also a member of one or more groups.
+One of these groups is distinguished from others and
+used in implementing accounting facilities.
+The positive
+integer corresponding to this distinguished group is termed
+the real group ID.
+.Pp
+All processes have a real user ID and real group ID.
+These are initialized from the equivalent attributes
+of the process that created it.
+.It "Effective User Id, Effective Group Id, and Group Access List"
+Access to system resources is governed by two values:
+the effective user ID, and the group access list.
+The first member of the group access list is also known as the
+effective group ID.
+(In POSIX.1, the group access list is known as the set of supplementary
+group IDs, and it is unspecified whether the effective group ID is
+a member of the list.)
+.Pp
+The effective user ID and effective group ID are initially the
+process's real user ID and real group ID respectively.
+Either
+may be modified through execution of a set-user-ID or set-group-ID
+file (possibly by one its ancestors) (see
+.Xr execve 2 ) .
+By convention, the effective group ID (the first member of the group access
+list) is duplicated, so that the execution of a set-group-ID program
+does not result in the loss of the original (real) group ID.
+.Pp
+The group access list is a set of group IDs
+used only in determining resource accessibility.
+Access checks
+are performed as described below in ``File Access Permissions''.
+.It "Saved Set User ID and Saved Set Group ID"
+When a process executes a new file, the effective user ID is set
+to the owner of the file if the file is set-user-ID, and the effective
+group ID (first element of the group access list) is set to the group
+of the file if the file is set-group-ID.
+The effective user ID of the process is then recorded as the saved set-user-ID,
+and the effective group ID of the process is recorded as the saved set-group-ID.
+These values may be used to regain those values as the effective user
+or group ID after reverting to the real ID (see
+.Xr setuid 2 ) .
+(In POSIX.1, the saved set-user-ID and saved set-group-ID are optional,
+and are used in setuid and setgid, but this does not work as desired
+for the super-user.)
+.It Super-user
+A process is recognized as a
+.Em super-user
+process and is granted special privileges if its effective user ID is 0.
+.It Descriptor
+An integer assigned by the system when a file is referenced
+by
+.Xr open 2
+or
+.Xr dup 2 ,
+or when a socket is created by
+.Xr pipe 2 ,
+.Xr socket 2
+or
+.Xr socketpair 2 ,
+which uniquely identifies an access path to that file or socket from
+a given process or any of its children.
+.It File Name
+Names consisting of up to
+.Brq Dv NAME_MAX
+characters may be used to name
+an ordinary file, special file, or directory.
+.Pp
+These characters may be arbitrary eight-bit values,
+excluding
+.Dv NUL
+.Tn ( ASCII
+0) and the
+.Ql \&/
+character (slash,
+.Tn ASCII
+47).
+.Pp
+Note that it is generally unwise to use
+.Ql \&* ,
+.Ql \&? ,
+.Ql \&[
+or
+.Ql \&]
+as part of
+file names because of the special meaning attached to these characters
+by the shell.
+.It Path Name
+A path name is a
+.Dv NUL Ns -terminated
+character string starting with an
+optional slash
+.Ql \&/ ,
+followed by zero or more directory names separated
+by slashes, optionally followed by a file name.
+The total length of a path name must be less than
+.Brq Dv PATH_MAX
+characters.
+(On some systems, this limit may be infinite.)
+.Pp
+If a path name begins with a slash, the path search begins at the
+.Em root
+directory.
+Otherwise, the search begins from the current working directory.
+A slash by itself names the root directory.
+An empty
+pathname refers to the current directory.
+.It Directory
+A directory is a special type of file that contains entries
+that are references to other files.
+Directory entries are called links.
+By convention, a directory
+contains at least two links,
+.Ql .\&
+and
+.Ql \&.. ,
+referred to as
+.Em dot
+and
+.Em dot-dot
+respectively.
+Dot refers to the directory itself and
+dot-dot refers to its parent directory.
+.It "Root Directory and Current Working Directory"
+Each process has associated with it a concept of a root directory
+and a current working directory for the purpose of resolving path
+name searches.
+A process's root directory need not be the root
+directory of the root file system.
+.It File Access Permissions
+Every file in the file system has a set of access permissions.
+These permissions are used in determining whether a process
+may perform a requested operation on the file (such as opening
+a file for writing).
+Access permissions are established at the
+time a file is created.
+They may be changed at some later time
+through the
+.Xr chmod 2
+call.
+.Pp
+File access is broken down according to whether a file may be: read,
+written, or executed.
+Directory files use the execute
+permission to control if the directory may be searched.
+.Pp
+File access permissions are interpreted by the system as
+they apply to three different classes of users: the owner
+of the file, those users in the file's group, anyone else.
+Every file has an independent set of access permissions for
+each of these classes.
+When an access check is made, the system
+decides if permission should be granted by checking the access
+information applicable to the caller.
+.Pp
+Read, write, and execute/search permissions on
+a file are granted to a process if:
+.Pp
+The process's effective user ID is that of the super-user.
+(Note:
+even the super-user cannot execute a non-executable file.)
+.Pp
+The process's effective user ID matches the user ID of the owner
+of the file and the owner permissions allow the access.
+.Pp
+The process's effective user ID does not match the user ID of the
+owner of the file, and either the process's effective
+group ID matches the group ID
+of the file, or the group ID of the file is in
+the process's group access list,
+and the group permissions allow the access.
+.Pp
+Neither the effective user ID nor effective group ID
+and group access list of the process
+match the corresponding user ID and group ID of the file,
+but the permissions for ``other users'' allow access.
+.Pp
+Otherwise, permission is denied.
+.It Sockets and Address Families
+A socket is an endpoint for communication between processes.
+Each socket has queues for sending and receiving data.
+.Pp
+Sockets are typed according to their communications properties.
+These properties include whether messages sent and received
+at a socket require the name of the partner, whether communication
+is reliable, the format used in naming message recipients, etc.
+.Pp
+Each instance of the system supports some
+collection of socket types; consult
+.Xr socket 2
+for more information about the types available and
+their properties.
+.Pp
+Each instance of the system supports some number of sets of
+communications protocols.
+Each protocol set supports addresses
+of a certain format.
+An Address Family is the set of addresses
+for a specific group of protocols.
+Each socket has an address
+chosen from the address family in which the socket was created.
+.El
+.Sh SEE ALSO
+.Xr intro 3 ,
+.Xr perror 3
diff --git a/lib/libc/sys/ioctl.2 b/lib/libc/sys/ioctl.2
new file mode 100644
index 0000000..bab7b47
--- /dev/null
+++ b/lib/libc/sys/ioctl.2
@@ -0,0 +1,155 @@
+.\" Copyright (c) 1980, 1991, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"     @(#)ioctl.2	8.2 (Berkeley) 12/11/93
+.\"
+.\" $FreeBSD$
+.\"
+.Dd May 11, 2010
+.Dt IOCTL 2
+.Os
+.Sh NAME
+.Nm ioctl
+.Nd control device
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In sys/ioctl.h
+.Ft int
+.Fn ioctl "int d" "unsigned long request" ...
+.Sh DESCRIPTION
+The
+.Fn ioctl
+system call manipulates the underlying device parameters of special files.
+In particular, many operating
+characteristics of character special files (e.g.\& terminals)
+may be controlled with
+.Fn ioctl
+requests.
+The argument
+.Fa d
+must be an open file descriptor.
+.Pp
+The third argument to
+.Fn ioctl
+is traditionally named
+.Va "char *argp" .
+Most uses of
+.Fn ioctl ,
+however, require the third argument to be a
+.Vt caddr_t
+or an
+.Vt int .
+.Pp
+An
+.Fn ioctl
+.Fa request
+has encoded in it whether the argument is an
+.Dq in
+argument
+or
+.Dq out
+argument, and the size of the argument
+.Fa argp
+in bytes.
+Macros and defines used in specifying an ioctl
+.Fa request
+are located in the file
+.In sys/ioctl.h .
+.Sh GENERIC IOCTLS
+Some generic ioctls are not implemented for all types of file
+descriptors.
+These include:
+.Bl -tag -width "xxxxxx"
+.It Dv FIONREAD int
+Get the number of bytes that are immediately available for reading.
+.It Dv FIONWRITE int
+Get the number of bytes in the descriptor's send queue.
+These bytes are data which has been written to the descriptor but
+which are being held by the kernel for further processing.
+The nature of the required processing depends on the underlying device.
+For TCP sockets, these bytes have not yet been acknowledged by the
+other side of the connection.
+.It Dv FIONSPACE int
+Get the free space in the descriptor's send queue.
+This value is the size of the send queue minus the number of bytes
+being held in the queue.
+Note: while this value represents the number of bytes that may be
+added to the queue, other resource limitations may cause a write
+not larger than the send queue's space to be blocked.
+One such limitation would be a lack of network buffers for a write
+to a network connection.
+.El
+.Sh RETURN VALUES
+If an error has occurred, a value of -1 is returned and
+.Va errno
+is set to indicate the error.
+.Sh ERRORS
+The
+.Fn ioctl
+system call
+will fail if:
+.Bl -tag -width Er
+.It Bq Er EBADF
+The
+.Fa d
+argument
+is not a valid descriptor.
+.It Bq Er ENOTTY
+The
+.Fa d
+argument
+is not associated with a character
+special device.
+.It Bq Er ENOTTY
+The specified request does not apply to the kind
+of object that the descriptor
+.Fa d
+references.
+.It Bq Er EINVAL
+The
+.Fa request
+or
+.Fa argp
+argument
+is not valid.
+.It Bq Er EFAULT
+The
+.Fa argp
+argument
+points outside the process's allocated address space.
+.El
+.Sh SEE ALSO
+.Xr execve 2 ,
+.Xr fcntl 2 ,
+.Xr intro 4 ,
+.Xr tty 4
+.Sh HISTORY
+The
+.Fn ioctl
+function appeared in
+.At v7 .
diff --git a/lib/libc/sys/issetugid.2 b/lib/libc/sys/issetugid.2
new file mode 100644
index 0000000..aed5062
--- /dev/null
+++ b/lib/libc/sys/issetugid.2
@@ -0,0 +1,98 @@
+.\"	$OpenBSD: issetugid.2,v 1.7 1997/02/18 00:16:09 deraadt Exp $
+.\"
+.\" Copyright (c) 1980, 1991, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd August 25, 1996
+.Dt ISSETUGID 2
+.Os
+.Sh NAME
+.Nm issetugid
+.Nd is current process tainted by uid or gid changes
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In unistd.h
+.Ft int
+.Fn issetugid void
+.Sh DESCRIPTION
+The
+.Fn issetugid
+system call returns 1 if the process environment or memory address space
+is considered
+.Dq tainted ,
+and returns 0 otherwise.
+.Pp
+A process is tainted if it was created as a result of an
+.Xr execve 2
+system call which had either of the setuid or setgid bits set (and extra
+privileges were given as a result) or if it has changed any of its real,
+effective or saved user or group ID's since it began execution.
+.Pp
+This system call exists so that library routines (eg: libc, libtermcap)
+can reliably determine if it is safe to use information
+that was obtained from the user, in particular the results from
+.Xr getenv 3
+should be viewed with suspicion if it is used to control operation.
+.Pp
+A
+.Dq tainted
+status is inherited by child processes as a result of the
+.Xr fork 2
+system call (or other library code that calls fork, such as
+.Xr popen 3 ) .
+.Pp
+It is assumed that a program that clears all privileges as it prepares
+to execute another will also reset the environment, hence the
+.Dq tainted
+status will not be passed on.
+This is important for programs such as
+.Xr su 1
+which begin setuid but need to be able to create an untainted process.
+.Sh ERRORS
+The
+.Fn issetugid
+system call is always successful, and no return value is reserved to
+indicate an error.
+.Sh SEE ALSO
+.Xr execve 2 ,
+.Xr fork 2 ,
+.Xr setegid 2 ,
+.Xr seteuid 2 ,
+.Xr setgid 2 ,
+.Xr setregid 2 ,
+.Xr setreuid 2 ,
+.Xr setuid 2
+.Sh HISTORY
+The
+.Fn issetugid
+system call first appeared in
+.Ox 2.0
+and was also implemented in
+.Fx 3.0 .
diff --git a/lib/libc/sys/jail.2 b/lib/libc/sys/jail.2
new file mode 100644
index 0000000..bf6218c
--- /dev/null
+++ b/lib/libc/sys/jail.2
@@ -0,0 +1,448 @@
+.\" Copyright (c) 1999 Poul-Henning Kamp.
+.\" Copyright (c) 2009 James Gritton.
+.\" All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd June 23, 2009
+.Dt JAIL 2
+.Os
+.Sh NAME
+.Nm jail ,
+.Nm jail_get ,
+.Nm jail_set ,
+.Nm jail_remove ,
+.Nm jail_attach
+.Nd create and manage system jails
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In sys/param.h
+.In sys/jail.h
+.Ft int
+.Fn jail "struct jail *jail"
+.Ft int
+.Fn jail_attach "int jid"
+.Ft int
+.Fn jail_remove "int jid"
+.In sys/uio.h
+.Ft int
+.Fn jail_get "struct iovec *iov" "u_int niov" "int flags"
+.Ft int
+.Fn jail_set "struct iovec *iov" "u_int niov" "int flags"
+.Sh DESCRIPTION
+The
+.Fn jail
+system call sets up a jail and locks the current process in it.
+.Pp
+The argument is a pointer to a structure describing the prison:
+.Bd -literal -offset indent
+struct jail {
+	u_int32_t	version;
+	char		*path;
+	char		*hostname;
+	char		*jailname;
+	unsigned int	ip4s;
+	unsigned int	ip6s;
+	struct in_addr	*ip4;
+	struct in6_addr	*ip6;
+};
+.Ed
+.Pp
+.Dq Li version
+defines the version of the API in use.
+.Dv JAIL_API_VERSION
+is defined for the current version.
+.Pp
+The
+.Dq Li path
+pointer should be set to the directory which is to be the root of the
+prison.
+.Pp
+The
+.Dq Li hostname
+pointer can be set to the hostname of the prison.
+This can be changed
+from the inside of the prison.
+.Pp
+The
+.Dq Li jailname
+pointer is an optional name that can be assigned to the jail
+for example for management purposes.
+.Pp
+The
+.Dq Li ip4s
+and
+.Dq Li ip6s
+give the numbers of IPv4 and IPv6 addresses that will be passed
+via their respective pointers.
+.Pp
+The
+.Dq Li ip4
+and
+.Dq Li ip6
+pointers can be set to an arrays of IPv4 and IPv6 addresses to be assigned to
+the prison, or NULL if none.
+IPv4 addresses must be in network byte order.
+.Pp
+This is equivalent to the
+.Fn jail_set
+system call (see below), with the parameters
+.Va path ,
+.Va host.hostname ,
+.Va name ,
+.Va ip4.addr ,
+and
+.Va ip6.addr ,
+and with the
+.Dv JAIL_ATTACH
+flag.
+.Pp
+The
+.Fn jail_set
+system call creates a new jail, or modifies an existing one, and optionally
+locks the current process in it.
+Jail parameters are passed as an array of name-value pairs in the array
+.Fa iov ,
+containing
+.Fa niov
+elements.
+Parameter names are a null-terminated string, and values may be strings,
+integers, or other arbitrary data.
+Some parameters are boolean, and do not have a value (their length is zero)
+but are set by the name alone with or without a
+.Dq no
+prefix, e.g.
+.Va persist
+or
+.Va nopersist .
+Any parameters not set will be given default values, generally based on
+the current environment.
+.Pp
+Jails have a set of core parameters, and modules can add their own jail
+parameters.
+The current set of available parameters, and their formats, can be
+retrieved via the
+.Va security.jail.param
+sysctl MIB entry.
+Notable parameters include those mentioned in the
+.Fn jail
+description above, as well as
+.Va jid
+and
+.Va name ,
+which identify the jail being created or modified.
+See
+.Xr jail 8
+for more information on the core jail parameters.
+.Pp
+The
+.Fa flags
+arguments consists of one or more of the following flags:
+.Bl -tag -width indent
+.It Dv JAIL_CREATE
+Create a new jail.
+If a
+.Va jid
+or
+.Va name
+parameters exists, they must not refer to an existing jail.
+.It Dv JAIL_UPDATE
+Modify an existing jail.
+One of the
+.Va jid
+or
+.Va name
+parameters must exist, and must refer to an existing jail.
+If both
+.Dv JAIL_CREATE
+and
+.Dv JAIL_UPDATE
+are set, a jail will be created if it does not yet exist, and modified if it
+does exist.
+.It Dv JAIL_ATTACH
+In addition to creating or modifying the jail, attach the current process to
+it, as with the
+.Fn jail_attach
+system call.
+.It Dv JAIL_DYING
+Allow setting a jail that is in the process of being removed.
+.El
+.Pp
+The
+.Fn jail_get
+system call retrieves jail parameters, using the same name-value list as
+.Fn jail_set
+in the
+.Fa iov
+and
+.Fa niov
+arguments.
+The jail to read can be specified by either
+.Va jid
+or
+.Va name
+by including those parameters in the list.
+If they are included but are not intended to be the search key, they
+should be cleared (zero and the empty string respectively).
+.Pp
+The special parameter
+.Va lastjid
+can be used to retrieve a list of all jails.
+It will fetch the jail with the jid above and closest to the passed value.
+The first jail (usually but not always jid 1) can be found by passing a
+.Va lastjid
+of zero.
+.Pp
+The
+.Fa flags
+arguments consists of one or more following flags:
+.Bl -tag -width indent
+.It Dv JAIL_DYING
+Allow getting a jail that is in the process of being removed.
+.El
+.Pp
+The
+.Fn jail_attach
+system call attaches the current process to an existing jail,
+identified by
+.Fa jid .
+.Pp
+The
+.Fn jail_remove
+system call removes the jail identified by
+.Fa jid .
+It will kill all processes belonging to the jail, and remove any children
+of that jail.
+.Sh RETURN VALUES
+If successful,
+.Fn jail ,
+.Fn jail_set ,
+and
+.Fn jail_get
+return a non-negative integer, termed the jail identifier (JID).
+They return \-1 on failure, and set
+.Va errno
+to indicate the error.
+.Pp
+.Rv -std jail_attach jail_remove
+.Sh PRISON?
+Once a process has been put in a prison, it and its descendants cannot escape
+the prison.
+.Pp
+Inside the prison, the concept of
+.Dq superuser
+is very diluted.
+In general,
+it can be assumed that nothing can be mangled from inside a prison which
+does not exist entirely inside that prison.
+For instance the directory
+tree below
+.Dq Li path
+can be manipulated all the ways a root can normally do it, including
+.Dq Li "rm -rf /*"
+but new device special nodes cannot be created because they reference
+shared resources (the device drivers in the kernel).
+The effective
+.Dq securelevel
+for a process is the greater of the global
+.Dq securelevel
+or, if present, the per-jail
+.Dq securelevel .
+.Pp
+All IP activity will be forced to happen to/from the IP number specified,
+which should be an alias on one of the network interfaces.
+All connections to/from the loopback address
+.Pf ( Li 127.0.0.1
+for IPv4,
+.Li ::1
+for IPv6) will be changed to be to/from the primary address
+of the jail for the given address family.
+.Pp
+It is possible to identify a process as jailed by examining
+.Dq Li /proc/<pid>/status :
+it will show a field near the end of the line, either as
+a single hyphen for a process at large, or the name currently
+set for the prison for jailed processes.
+.Sh ERRORS
+The
+.Fn jail
+system call
+will fail if:
+.Bl -tag -width Er
+.It Bq Er EPERM
+This process is not allowed to create a jail, either because it is not
+the super-user, or because it would exceed the jail's
+.Va children.max
+limit.
+.It Bq Er EFAULT
+.Fa jail
+points to an address outside the allocated address space of the process.
+.It Bq Er EINVAL
+The version number of the argument is not correct.
+.It Bq Er EAGAIN
+No free JID could be found.
+.El
+.Pp
+The
+.Fn jail_set
+system call
+will fail if:
+.Bl -tag -width Er
+.It Bq Er EPERM
+This process is not allowed to create a jail, either because it is not
+the super-user, or because it would exceed the jail's
+.Va children.max
+limit.
+.It Bq Er EPERM
+A jail parameter was set to a less restrictive value then the current
+environment.
+.It Bq Er EFAULT
+.Fa Iov ,
+or one of the addresses contained within it,
+points to an address outside the allocated address space of the process.
+.It Bq Er ENOENT
+The jail referred to by a
+.Va jid
+or
+.Va name
+parameter does not exist, and the
+.Dv JAIL_CREATE
+flag is not set.
+.It Bq Er ENOENT
+The jail referred to by a
+.Va jid
+is not accessible by the process, because the process is in a different
+jail. 
+.It Bq Er EEXIST
+The jail referred to by a
+.Va jid
+or
+.Va name
+parameter exists, and the
+.Dv JAIL_UPDATE
+flag is not set.
+.It Bq Er EINVAL
+A supplied parameter is the wrong size.
+.It Bq Er EINVAL
+A supplied parameter is out of range.
+.It Bq Er EINVAL
+A supplied string parameter is not null-terminated.
+.It Bq Er EINVAL
+A supplied parameter name does not match any known parameters.
+.It Bq Er EINVAL
+One of the
+.Dv JAIL_CREATE
+or
+.Dv JAIL_UPDATE
+flags is not set.
+.It Bq Er ENAMETOOLONG
+A supplied string parameter is longer than allowed.
+.It Bq Er EAGAIN
+There are no jail IDs left.
+.El
+.Pp
+The
+.Fn jail_get
+system call
+will fail if:
+.Bl -tag -width Er
+.It Bq Er EFAULT
+.Fa Iov ,
+or one of the addresses contained within it,
+points to an address outside the allocated address space of the process.
+.It Bq Er ENOENT
+The jail referred to by a
+.Va jid
+or
+.Va name
+parameter does not exist.
+.It Bq Er ENOENT
+The jail referred to by a
+.Va jid
+is not accessible by the process, because the process is in a different
+jail. 
+.It Bq Er ENOENT
+The
+.Va lastjid
+parameter is greater than the highest current jail ID.
+.It Bq Er EINVAL
+A supplied parameter is the wrong size.
+.It Bq Er EINVAL
+A supplied parameter name does not match any known parameters.
+.El
+.Pp
+The
+.Fn jail_attach
+and
+.Fn jail_remove
+system calls
+will fail if:
+.Bl -tag -width Er
+.It Bq Er EINVAL
+The jail specified by
+.Fa jid
+does not exist.
+.El
+.Pp
+Further
+.Fn jail ,
+.Fn jail_set ,
+and
+.Fn jail_attach
+call
+.Xr chroot 2
+internally, so it can fail for all the same reasons.
+Please consult the
+.Xr chroot 2
+manual page for details.
+.Sh SEE ALSO
+.Xr chdir 2 ,
+.Xr chroot 2 ,
+.Xr jail 8
+.Sh HISTORY
+The
+.Fn jail
+system call appeared in
+.Fx 4.0 .
+The
+.Fn jail_attach
+system call appeared in
+.Fx 5.1 .
+The
+.Fn jail_set ,
+.Fn jail_get ,
+and
+.Fn jail_remove
+system calls appeared in
+.Fx 8.0 .
+.Sh AUTHORS
+The jail feature was written by
+.An Poul-Henning Kamp
+for R&D Associates
+.Dq Li http://www.rndassociates.com/
+who contributed it to
+.Fx .
+.An James Gritton
+added the extensible jail parameters and hierarchical jails.
diff --git a/lib/libc/sys/kenv.2 b/lib/libc/sys/kenv.2
new file mode 100644
index 0000000..866c0d38
--- /dev/null
+++ b/lib/libc/sys/kenv.2
@@ -0,0 +1,179 @@
+.\"
+.\" Copyright (C) 2002 Chad David <davidc@FreeBSD.org>. All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice(s), this list of conditions and the following disclaimer as
+.\"    the first lines of this file unmodified other than the possible
+.\"    addition of one or more copyright notices.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice(s), this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) ``AS IS'' AND ANY
+.\" EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+.\" WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+.\" DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) BE LIABLE FOR ANY
+.\" DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+.\" (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+.\" SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+.\" CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
+.\" DAMAGE.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd April 17, 2002
+.Dt KENV 2
+.Os
+.Sh NAME
+.Nm kenv
+.Nd kernel environment
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In kenv.h
+.Ft int
+.Fn kenv "int action" "const char *name" "char *value" "int len"
+.Sh DESCRIPTION
+The
+.Fn kenv
+system call manipulates kernel environment variables.
+It supports the well known userland actions of getting, setting and unsetting
+environment variables, as well as the ability to dump all of the entries in
+the kernel environment.
+.Pp
+The
+.Fa action
+argument can be one of the following:
+.Bl -tag -width ".Dv KENV_UNSET"
+.It Dv KENV_GET
+Returns the value associated with the named kernel environment variable.
+If the variable is not found, \-1 is returned and
+the global variable
+.Va errno
+is set to
+.Er ENOENT .
+Only the number of bytes available in
+.Fa value
+are copied out.
+.It Dv KENV_SET
+Sets or adds a new kernel environment variable.
+This option is only available to the superuser.
+.It Dv KENV_UNSET
+Unsets the kernel environment variable
+.Fa name .
+If the variable does not exist, \-1 is returned and
+the global variable
+.Va errno
+is set to
+.Er EINVAL .
+This option is only available to the superuser.
+.It Dv KENV_DUMP
+Dumps as much of the kernel environment as will fit in
+.Fa value .
+If
+.Fa value
+is
+.Dv NULL ,
+.Fn kenv
+will return the number of bytes required to copy out the entire environment.
+.El
+.Pp
+The
+.Fa name
+argument is the name of the environment variable to be affected.
+In the case of
+.Dv KENV_DUMP
+it is ignored.
+.Pp
+The
+.Fa value
+argument contains either the value to set the environment variable
+.Fa name
+to in the case of
+.Dv KENV_SET ,
+or it points to the location where
+.Fn kenv
+should copy return data to in the case of
+.Dv KENV_DUMP
+and
+.Dv KENV_GET .
+If
+.Fa value
+is
+.Dv NULL
+in the case of
+.Dv KENV_DUMP ,
+.Fn kenv
+will return the number of bytes required to copy out the entire environment.
+.Pp
+The
+.Fa len
+argument indicates how many bytes of storage
+.Fa value
+points to.
+.Sh RETURN VALUES
+The
+.Fn kenv
+system call returns 0 if successful in the case of
+.Dv KENV_SET
+and
+.Dv KENV_UNSET ,
+and the number of bytes copied into
+.Fa value
+in the case of
+.Dv KENV_DUMP
+and
+.Dv KENV_GET .
+If an error occurs, a value of \-1 is returned and
+the global variable
+.Va errno
+is set to indicate the error.
+.Sh ERRORS
+The
+.Fn kenv
+system call
+will fail if:
+.Bl -tag -width Er
+.It Bq Er EINVAL
+The
+.Fa action
+argument
+is not a valid option, or the length of the
+.Fa value
+is less than 1 for a
+.Dv KENV_SET .
+.It Bq Er ENOENT
+no value could be found for
+.Fa name
+for a
+.Dv KENV_SET
+or
+.Dv KENV_UNSET .
+.It Bq Er EPERM
+a user other than the superuser attempted to set or unset a kernel
+environment variable.
+.It Bq Er EFAULT
+bad address was encountered while attempting to copy in user arguments,
+or copy out value(s).
+.It Bq Er ENAMETOOLONG
+the name of a variable supplied by the user is longer than
+.Dv KENV_MNAMELEN
+or the value of a variable is longer than
+.Dv KENV_MVALLEN .
+.El
+.Sh SEE ALSO
+.Xr kenv 1
+.Sh AUTHORS
+.An -nosplit
+This manual page was written by
+.An Chad David Aq davidc@FreeBSD.org .
+.Pp
+The
+.Fn kenv
+system call was written by
+.An Maxime Henrion Aq mux@FreeBSD.org .
diff --git a/lib/libc/sys/kill.2 b/lib/libc/sys/kill.2
new file mode 100644
index 0000000..d46dc1f
--- /dev/null
+++ b/lib/libc/sys/kill.2
@@ -0,0 +1,151 @@
+.\" Copyright (c) 1980, 1991, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"     @(#)kill.2	8.3 (Berkeley) 4/19/94
+.\" $FreeBSD$
+.\"
+.Dd April 19, 1994
+.Dt KILL 2
+.Os
+.Sh NAME
+.Nm kill
+.Nd send signal to a process
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In sys/types.h
+.In signal.h
+.Ft int
+.Fn kill "pid_t pid" "int sig"
+.Sh DESCRIPTION
+The
+.Fn kill
+system call sends the signal given by
+.Fa sig
+to
+.Fa pid ,
+a
+process or a group of processes.
+The
+.Fa sig
+argument
+may be one of the signals specified in
+.Xr sigaction 2
+or it may be 0, in which case
+error checking is performed but no
+signal is actually sent.
+This can be used to check the validity of
+.Fa pid .
+.Pp
+For a process to have permission to send a signal to a process designated
+by
+.Fa pid ,
+the real or effective user ID of the receiving process must match
+that of the sending process or the user must have appropriate privileges
+(such as given by a set-user-ID program or the user is the super-user).
+A single exception is the signal SIGCONT, which may always be sent
+to any process with the same session ID as the caller.
+.Bl -tag -width Ds
+.It \&If Fa pid No \&is greater than zero :
+The
+.Fa sig
+signal
+is sent to the process whose ID is equal to
+.Fa pid .
+.It \&If Fa pid No \&is zero :
+The
+.Fa sig
+signal
+is sent to all processes whose group ID is equal
+to the process group ID of the sender, and for which the
+process has permission;
+this is a variant of
+.Xr killpg 2 .
+.It \&If Fa pid No \&is -1 :
+If the user has super-user privileges,
+the signal is sent to all processes excluding
+system processes
+(with
+.Dv P_SYSTEM
+flag set),
+process with ID 1
+(usually
+.Xr init 8 ) ,
+and the process sending the signal.
+If the user is not the super user, the signal is sent to all processes
+with the same uid as the user excluding the process sending the signal.
+No error is returned if any process could be signaled.
+.El
+.Pp
+For compatibility with System V,
+if the process number is negative but not -1,
+the signal is sent to all processes whose process group ID
+is equal to the absolute value of the process number.
+This is a variant of
+.Xr killpg 2 .
+.Sh RETURN VALUES
+.Rv -std kill
+.Sh ERRORS
+The
+.Fn kill
+system call
+will fail and no signal will be sent if:
+.Bl -tag -width Er
+.It Bq Er EINVAL
+The
+.Fa sig
+argument
+is not a valid signal number.
+.It Bq Er ESRCH
+No process can be found corresponding to that specified by
+.Fa pid .
+.It Bq Er ESRCH
+The process id was given as 0
+but the sending process does not have a process group.
+.It Bq Er EPERM
+The sending process is not the super-user and its effective
+user id does not match the effective user-id of the receiving process.
+When signaling a process group, this error is returned if any members
+of the group could not be signaled.
+.El
+.Sh SEE ALSO
+.Xr getpgrp 2 ,
+.Xr getpid 2 ,
+.Xr killpg 2 ,
+.Xr sigaction 2 ,
+.Xr raise 3 ,
+.Xr init 8
+.Sh STANDARDS
+The
+.Fn kill
+system call is expected to conform to
+.St -p1003.1-90 .
+.Sh HISTORY
+The
+.Fn kill
+function appeared in
+.At v7 .
diff --git a/lib/libc/sys/kldfind.2 b/lib/libc/sys/kldfind.2
new file mode 100644
index 0000000..a8892ed
--- /dev/null
+++ b/lib/libc/sys/kldfind.2
@@ -0,0 +1,86 @@
+.\"
+.\" Copyright (c) 1999 Chris Costello
+.\" All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd March 3, 1999
+.Dt KLDFIND 2
+.Os
+.Sh NAME
+.Nm kldfind
+.Nd returns the fileid of a kld file
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In sys/param.h
+.In sys/linker.h
+.Ft int
+.Fn kldfind "const char *file"
+.Sh DESCRIPTION
+The
+.Fn kldfind
+system call
+returns the fileid of the kld file referenced by
+.Fa file .
+.Sh RETURN VALUES
+The
+.Fn kldfind
+system call
+returns the fileid of the kld file referenced by
+.Fa file .
+Upon error,
+.Fn kldfind
+returns -1 and sets
+.Va errno
+to indicate the error.
+.Sh ERRORS
+.Va errno
+is set to the following if
+.Fn kldfind
+fails:
+.Bl -tag -width Er
+.It Bq Er EFAULT
+The data required for this operation could not be read from the kernel space.
+.It Bq Er ENOENT
+The file specified is not loaded in the kernel.
+.El
+.Sh SEE ALSO
+.Xr kldfirstmod 2 ,
+.Xr kldload 2 ,
+.Xr kldnext 2 ,
+.Xr kldstat 2 ,
+.Xr kldsym 2 ,
+.Xr kldunload 2 ,
+.Xr modfind 2 ,
+.Xr modfnext 2 ,
+.Xr modnext 2 ,
+.Xr modstat 2 ,
+.Xr kld 4 ,
+.Xr kldstat 8
+.Sh HISTORY
+The
+.Nm kld
+interface first appeared in
+.Fx 3.0 .
diff --git a/lib/libc/sys/kldfirstmod.2 b/lib/libc/sys/kldfirstmod.2
new file mode 100644
index 0000000..d9967cc
--- /dev/null
+++ b/lib/libc/sys/kldfirstmod.2
@@ -0,0 +1,76 @@
+.\"
+.\" Copyright (c) 1999 Chris Costello
+.\" All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd March 3, 1999
+.Dt KLDFIRSTMOD 2
+.Os
+.Sh NAME
+.Nm kldfirstmod
+.Nd "return first module id from the kld file specified"
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In sys/param.h
+.In sys/linker.h
+.Ft int
+.Fn kldfirstmod "int fileid"
+.Sh DESCRIPTION
+The
+.Fn kldfirstmod
+system call returns the module id pertaining to the first module referenced by
+.Fa fileid .
+.Sh RETURN VALUES
+The
+.Fn kldfirstmod
+will return the id of the first module referenced by
+.Fa fileid
+or 0 if there are no references.
+.Sh ERRORS
+.Bl -tag -width Er
+.It Bq Er ENOENT
+The kld file referenced by
+.Fa fileid
+was not found.
+.El
+.Sh SEE ALSO
+.Xr kldfind 2 ,
+.Xr kldload 2 ,
+.Xr kldnext 2 ,
+.Xr kldstat 2 ,
+.Xr kldsym 2 ,
+.Xr kldunload 2 ,
+.Xr modfind 2 ,
+.Xr modfnext 2 ,
+.Xr modnext 2 ,
+.Xr modstat 2 ,
+.Xr kld 4 ,
+.Xr kldstat 8
+.Sh HISTORY
+The
+.Nm kld
+interface first appeared in
+.Fx 3.0 .
diff --git a/lib/libc/sys/kldload.2 b/lib/libc/sys/kldload.2
new file mode 100644
index 0000000..d31cc08
--- /dev/null
+++ b/lib/libc/sys/kldload.2
@@ -0,0 +1,96 @@
+.\"
+.\" Copyright (c) 1999 Chris Costello
+.\" All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd March 3, 1999
+.Dt KLDLOAD 2
+.Os
+.Sh NAME
+.Nm kldload
+.Nd load KLD files into the kernel
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In sys/param.h
+.In sys/linker.h
+.Ft int
+.Fn kldload "const char *file"
+.Sh DESCRIPTION
+The
+.Fn kldload
+system call
+loads a kld file into the kernel using the kernel linker.
+.Sh RETURN VALUES
+The
+.Fn kldload
+system call
+returns the fileid of the kld file which was loaded into the kernel.
+If an error occurs,
+.Fn kldload
+will return -1 and set
+.Va errno
+to indicate the error.
+.Sh ERRORS
+The named file is loaded unless:
+.Bl -tag -width Er
+.It Bq Er EPERM
+You do not have access to read the file or link it with the kernel.
+You should be the root user to be able to use the
+.Nm kld
+system calls.
+.It Bq Er EFAULT
+Bad address encountered when adding kld info into the kernel space.
+.It Bq Er ENOMEM
+There is no memory to load the file into the kernel.
+.It Bq Er ENOENT
+The file was not found.
+.It Bq Er ENOEXEC
+The file format of
+.Fa file
+was unrecognized.
+.It Bq Er EEXIST
+The supplied
+.Fa file
+has already been loaded.
+.El
+.Sh SEE ALSO
+.Xr kldfind 2 ,
+.Xr kldfirstmod 2 ,
+.Xr kldnext 2 ,
+.Xr kldstat 2 ,
+.Xr kldsym 2 ,
+.Xr kldunload 2 ,
+.Xr modfind 2 ,
+.Xr modfnext 2 ,
+.Xr modnext 2 ,
+.Xr modstat 2 ,
+.Xr kld 4 ,
+.Xr kldload 8
+.Sh HISTORY
+The
+.Nm kld
+interface first appeared in
+.Fx 3.0 .
diff --git a/lib/libc/sys/kldnext.2 b/lib/libc/sys/kldnext.2
new file mode 100644
index 0000000..c856a2e
--- /dev/null
+++ b/lib/libc/sys/kldnext.2
@@ -0,0 +1,89 @@
+.\"
+.\" Copyright (c) 1999 Chris Costello
+.\" All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd February 22, 2006
+.Dt KLDNEXT 2
+.Os
+.Sh NAME
+.Nm kldnext
+.Nd return the fileid of the next kld file
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In sys/param.h
+.In sys/linker.h
+.Ft int
+.Fn kldnext "int fileid"
+.Sh DESCRIPTION
+The
+.Fn kldnext
+system call
+returns the fileid of the next kld file (that is, the one after
+.Fa fileid )
+or 0 if
+.Fa fileid
+is the last file loaded.
+To get the fileid of the first kld file, pass
+.Fa fileid
+of 0 to
+.Fn kldnext .
+.Sh RETURN VALUES
+The
+.Fn kldnext
+system call
+returns the fileid of the next kld file or 0 if successful.
+Otherwise
+.Fn kldnext
+returns the value \-1 and sets the global variable
+.Va errno
+to indicate the error.
+.Sh ERRORS
+The only error set by
+.Fn kldnext
+is
+.Er ENOENT ,
+which is set when
+.Fa fileid
+refers to a kld file that does not exist (is not loaded).
+.Sh SEE ALSO
+.Xr kldfind 2 ,
+.Xr kldfirstmod 2 ,
+.Xr kldload 2 ,
+.Xr kldstat 2 ,
+.Xr kldsym 2 ,
+.Xr kldunload 2 ,
+.Xr modfind 2 ,
+.Xr modfnext 2 ,
+.Xr modnext 2 ,
+.Xr modstat 2 ,
+.Xr kld 4 ,
+.Xr kldstat 8
+.Sh HISTORY
+The
+.Nm kld
+interface first appeared in
+.Fx 3.0 .
diff --git a/lib/libc/sys/kldstat.2 b/lib/libc/sys/kldstat.2
new file mode 100644
index 0000000..0d28928
--- /dev/null
+++ b/lib/libc/sys/kldstat.2
@@ -0,0 +1,133 @@
+.\"
+.\" Copyright (c) 1999 Chris Costello
+.\" All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd March 3, 1999
+.Dt KLDSTAT 2
+.Os
+.Sh NAME
+.Nm kldstat
+.Nd get status of kld file
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In sys/param.h
+.In sys/linker.h
+.Ft int
+.Fn kldstat "int fileid" "struct kld_file_stat *stat"
+.Sh DESCRIPTION
+The
+.Fn kldstat
+system call writes the info for the file referred to by
+.Fa fileid
+into
+.Fa stat .
+.Bd -literal
+struct kld_file_stat {
+	int         version;        /* set to sizeof(linker_file_stat) */
+	char        name[MAXPATHLEN];
+	int         refs;
+	int         id;
+	caddr_t     address;        /* load address */
+	size_t      size;           /* size in bytes */
+	char        pathname[MAXPATHLEN];
+};
+.Ed
+.Bl -tag -width XXXaddress
+.It version
+This field is set to the size of the structure mentioned above by the code
+calling
+.Fn kldstat ,
+and not
+.Fn kldstat
+itself.
+.It name
+The name of the file referred to by
+.Fa fileid .
+.It refs
+The number of modules referenced by
+.Fa fileid .
+.It id
+The id of the file specified in
+.Fa fileid .
+.It address
+The load address of the kld file.
+.It size
+The size of the file.
+.It pathname
+The full name of the file referred to by
+.Fa fileid ,
+including the path.
+.El
+.Sh RETURN VALUES
+.Rv -std kldstat
+.Sh ERRORS
+The information for the file referred to by
+.Fa fileid
+is filled into the structure pointed to by
+.Fa stat
+unless:
+.Bl -tag -width Er
+.It Bq Er ENOENT
+The file was not found (probably not loaded).
+.It Bq Er EINVAL
+The version specified in the
+.Fa version
+field of stat is not the proper version.
+You would need to rebuild world, the
+kernel, or your application, if this error occurs, given that you did properly
+fill in the
+.Fa version
+field.
+.It Bq Er EFAULT
+There was a problem copying one, some, or all of the fields into
+.Fa stat
+in the
+.Xr copyout 9
+function.
+.El
+.Sh SEE ALSO
+.Xr kldfind 2 ,
+.Xr kldfirstmod 2 ,
+.Xr kldload 2 ,
+.Xr kldnext 2 ,
+.Xr kldsym 2 ,
+.Xr kldunload 2 ,
+.Xr modfind 2 ,
+.Xr modfnext 2 ,
+.Xr modnext 2 ,
+.Xr modstat 2 ,
+.Xr kld 4 ,
+.Xr kldstat 8
+.Sh HISTORY
+The
+.Nm kld
+interface first appeared in
+.Fx 3.0 .
+.Sh BUGS
+The pathname may not be accurate if the file system mounts have
+changed since the module was loaded, or if this function is called
+within a chrooted environment.
diff --git a/lib/libc/sys/kldsym.2 b/lib/libc/sys/kldsym.2
new file mode 100644
index 0000000..917a92a
--- /dev/null
+++ b/lib/libc/sys/kldsym.2
@@ -0,0 +1,121 @@
+.\" Copyright (c) 2001 Chris Costello <chris@FreeBSD.org>
+.\" All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd July 26, 2001
+.Dt KLDSYM 2
+.Os
+.Sh NAME
+.Nm kldsym
+.Nd look up address by symbol name in a KLD
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In sys/param.h
+.In sys/linker.h
+.Ft int
+.Fn kldsym "int fileid" "int command" "void *data"
+.Sh DESCRIPTION
+The
+.Fn kldsym
+system call returns the address of the symbol specified in
+.Fa data
+in the module specified by
+.Fa fileid .
+If
+.Fa fileid
+is 0, all loaded modules are searched.
+Currently, the only
+.Fa command
+implemented is
+.Dv KLDSYM_LOOKUP .
+.Pp
+The
+.Fa data
+argument is of the following structure:
+.Bd -literal -offset indent
+struct kld_sym_lookup {
+    int         version;        /* sizeof(struct kld_sym_lookup) */
+    char        *symname;       /* Symbol name we are looking up */
+    u_long      symvalue;
+    size_t      symsize;
+};
+.Ed
+.Pp
+The
+.Va version
+member is to be set
+by the code calling
+.Fn kldsym
+to
+.Fn sizeof "struct kld_sym_lookup" .
+The next two members,
+.Va version
+and
+.Va symname ,
+are specified by the user.
+The last two,
+.Va symvalue
+and
+.Va symsize ,
+are filled in by
+.Fn kldsym
+and contain the address associated with
+.Va symname
+and the size of the data it points to, respectively.
+.Sh RETURN VALUES
+.Rv -std kldsym
+.Sh ERRORS
+The
+.Fn kldsym
+system call will fail if:
+.Bl -tag -width Er
+.It Bq Er EINVAL
+Invalid value in
+.Fa data->version
+or
+.Fa command .
+.It Bq Er ENOENT
+The
+.Fa fileid
+argument
+is invalid,
+or the specified symbol could not be found.
+.El
+.Sh SEE ALSO
+.Xr kldfind 2 ,
+.Xr kldfirstmod 2 ,
+.Xr kldload 2 ,
+.Xr kldnext 2 ,
+.Xr kldunload 2 ,
+.Xr modfind 2 ,
+.Xr modnext 2 ,
+.Xr modstat 2 ,
+.Xr kld 4
+.Sh HISTORY
+The
+.Fn kldsym
+system call first appeared in
+.Fx 3.0 .
diff --git a/lib/libc/sys/kldunload.2 b/lib/libc/sys/kldunload.2
new file mode 100644
index 0000000..d1c259b
--- /dev/null
+++ b/lib/libc/sys/kldunload.2
@@ -0,0 +1,94 @@
+.\"
+.\" Copyright (c) 1999 Chris Costello
+.\" All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd December 25, 2008
+.Dt KLDUNLOAD 2
+.Os
+.Sh NAME
+.Nm kldunload , kldunloadf
+.Nd unload kld files
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In sys/param.h
+.In sys/linker.h
+.Ft int
+.Fn kldunload "int fileid"
+.Ft int
+.Fn kldunloadf "int fileid" "int flags"
+.Sh DESCRIPTION
+The
+.Fn kldunload
+system call
+unloads a kld file from the kernel that was previously linked via
+.Xr kldload 2 .
+.Pp
+The
+.Fn kldunloadf
+system call accepts an additional flags argument, which may be one of
+.Dv LINKER_UNLOAD_NORMAL ,
+giving the same behavior as
+.Fn kldunload ,
+or
+.Dv LINKER_UNLOAD_FORCE ,
+which causes the unload to ignore a failure to quiesce the module.
+.Sh RETURN VALUES
+.Rv -std
+.Sh ERRORS
+The file referred to by
+.Fa fileid
+is unloaded unless:
+.Bl -tag -width Er
+.It Bq Er EPERM
+You do not have access to unlink the file from the kernel.
+.It Bq Er ENOENT
+The file was not found.
+.It Bq Er EBUSY
+You attempted to unload a file linked by the kernel.
+.It Bq Er EINVAL
+The
+.Fn kldunloadf
+system call was passed invalid flags.
+.El
+.Sh SEE ALSO
+.Xr kldfind 2 ,
+.Xr kldfirstmod 2 ,
+.Xr kldload 2 ,
+.Xr kldnext 2 ,
+.Xr kldstat 2 ,
+.Xr kldsym 2 ,
+.Xr modfind 2 ,
+.Xr modfnext 2 ,
+.Xr modnext 2 ,
+.Xr modstat 2 ,
+.Xr kld 4 ,
+.Xr kldunload 8
+.Sh HISTORY
+The
+.Nm kld
+interface first appeared in
+.Fx 3.0 .
diff --git a/lib/libc/sys/kqueue.2 b/lib/libc/sys/kqueue.2
new file mode 100644
index 0000000..a1b6177
--- /dev/null
+++ b/lib/libc/sys/kqueue.2
@@ -0,0 +1,586 @@
+.\" Copyright (c) 2000 Jonathan Lemon
+.\" All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd September 15, 2009
+.Dt KQUEUE 2
+.Os
+.Sh NAME
+.Nm kqueue ,
+.Nm kevent
+.Nd kernel event notification mechanism
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In sys/types.h
+.In sys/event.h
+.In sys/time.h
+.Ft int
+.Fn kqueue "void"
+.Ft int
+.Fn kevent "int kq" "const struct kevent *changelist" "int nchanges" "struct kevent *eventlist" "int nevents" "const struct timespec *timeout"
+.Fn EV_SET "&kev" ident filter flags fflags data udata
+.Sh DESCRIPTION
+The
+.Fn kqueue
+system call
+provides a generic method of notifying the user when an event
+happens or a condition holds, based on the results of small
+pieces of kernel code termed filters.
+A kevent is identified by the (ident, filter) pair; there may only
+be one unique kevent per kqueue.
+.Pp
+The filter is executed upon the initial registration of a kevent
+in order to detect whether a preexisting condition is present, and is also
+executed whenever an event is passed to the filter for evaluation.
+If the filter determines that the condition should be reported,
+then the kevent is placed on the kqueue for the user to retrieve.
+.Pp
+The filter is also run when the user attempts to retrieve the kevent
+from the kqueue.
+If the filter indicates that the condition that triggered
+the event no longer holds, the kevent is removed from the kqueue and
+is not returned.
+.Pp
+Multiple events which trigger the filter do not result in multiple
+kevents being placed on the kqueue; instead, the filter will aggregate
+the events into a single struct kevent.
+Calling
+.Fn close
+on a file descriptor will remove any kevents that reference the descriptor.
+.Pp
+The
+.Fn kqueue
+system call
+creates a new kernel event queue and returns a descriptor.
+The queue is not inherited by a child created with
+.Xr fork 2 .
+However, if
+.Xr rfork 2
+is called without the
+.Dv RFFDG
+flag, then the descriptor table is shared,
+which will allow sharing of the kqueue between two processes.
+.Pp
+The
+.Fn kevent
+system call
+is used to register events with the queue, and return any pending
+events to the user.
+The
+.Fa changelist
+argument
+is a pointer to an array of
+.Va kevent
+structures, as defined in
+.In sys/event.h .
+All changes contained in the
+.Fa changelist
+are applied before any pending events are read from the queue.
+The
+.Fa nchanges
+argument
+gives the size of
+.Fa changelist .
+The
+.Fa eventlist
+argument
+is a pointer to an array of kevent structures.
+The
+.Fa nevents
+argument
+determines the size of
+.Fa eventlist .
+When
+.Fa nevents
+is zero,
+.Fn kevent
+will return immediately even if there is a
+.Fa timeout
+specified unlike
+.Xr select 2 .
+If
+.Fa timeout
+is a non-NULL pointer, it specifies a maximum interval to wait
+for an event, which will be interpreted as a struct timespec.
+If
+.Fa timeout
+is a NULL pointer,
+.Fn kevent
+waits indefinitely.
+To effect a poll, the
+.Fa timeout
+argument should be non-NULL, pointing to a zero-valued
+.Va timespec
+structure.
+The same array may be used for the
+.Fa changelist
+and
+.Fa eventlist .
+.Pp
+The
+.Fn EV_SET
+macro is provided for ease of initializing a
+kevent structure.
+.Pp
+The
+.Va kevent
+structure is defined as:
+.Bd -literal
+struct kevent {
+	uintptr_t ident;	/* identifier for this event */
+	short	  filter;	/* filter for event */
+	u_short	  flags;	/* action flags for kqueue */
+	u_int	  fflags;	/* filter flag value */
+	intptr_t  data;		/* filter data value */
+	void	  *udata;	/* opaque user data identifier */
+};
+.Ed
+.Pp
+The fields of
+.Fa struct kevent
+are:
+.Bl -tag -width XXXfilter
+.It ident
+Value used to identify this event.
+The exact interpretation is determined by the attached filter,
+but often is a file descriptor.
+.It filter
+Identifies the kernel filter used to process this event.
+The pre-defined
+system filters are described below.
+.It flags
+Actions to perform on the event.
+.It fflags
+Filter-specific flags.
+.It data
+Filter-specific data value.
+.It udata
+Opaque user-defined value passed through the kernel unchanged.
+.El
+.Pp
+The
+.Va flags
+field can contain the following values:
+.Bl -tag -width XXXEV_ONESHOT
+.It EV_ADD
+Adds the event to the kqueue.
+Re-adding an existing event
+will modify the parameters of the original event, and not result
+in a duplicate entry.
+Adding an event automatically enables it,
+unless overridden by the EV_DISABLE flag.
+.It EV_ENABLE
+Permit
+.Fn kevent
+to return the event if it is triggered.
+.It EV_DISABLE
+Disable the event so
+.Fn kevent
+will not return it.
+The filter itself is not disabled.
+.It EV_DISPATCH
+Disable the event source immediately after delivery of an event.
+See 
+.Dv EV_DISABLE
+above.
+.It EV_DELETE
+Removes the event from the kqueue.
+Events which are attached to
+file descriptors are automatically deleted on the last close of
+the descriptor.
+.It EV_RECEIPT
+This flag is useful for making bulk changes to a kqueue without draining
+any pending events.
+When passed as input, it forces
+.Dv EV_ERROR
+to always be returned.
+When a filter is successfully added the 
+.Va data
+field will be zero.
+.It EV_ONESHOT
+Causes the event to return only the first occurrence of the filter
+being triggered.
+After the user retrieves the event from the kqueue,
+it is deleted.
+.It EV_CLEAR
+After the event is retrieved by the user, its state is reset.
+This is useful for filters which report state transitions
+instead of the current state.
+Note that some filters may automatically
+set this flag internally.
+.It EV_EOF
+Filters may set this flag to indicate filter-specific EOF condition.
+.It EV_ERROR
+See
+.Sx RETURN VALUES
+below.
+.El
+.Pp
+The predefined system filters are listed below.
+Arguments may be passed to and from the filter via the
+.Va fflags
+and
+.Va data
+fields in the kevent structure.
+.Bl -tag -width EVFILT_SIGNAL
+.It EVFILT_READ
+Takes a descriptor as the identifier, and returns whenever
+there is data available to read.
+The behavior of the filter is slightly different depending
+on the descriptor type.
+.Bl -tag -width 2n
+.It Sockets
+Sockets which have previously been passed to
+.Fn listen
+return when there is an incoming connection pending.
+.Va data
+contains the size of the listen backlog.
+.Pp
+Other socket descriptors return when there is data to be read,
+subject to the
+.Dv SO_RCVLOWAT
+value of the socket buffer.
+This may be overridden with a per-filter low water mark at the
+time the filter is added by setting the
+NOTE_LOWAT
+flag in
+.Va fflags ,
+and specifying the new low water mark in
+.Va data .
+On return,
+.Va data
+contains the number of bytes of protocol data available to read.
+.Pp
+If the read direction of the socket has shutdown, then the filter
+also sets EV_EOF in
+.Va flags ,
+and returns the socket error (if any) in
+.Va fflags .
+It is possible for EOF to be returned (indicating the connection is gone)
+while there is still data pending in the socket buffer.
+.It Vnodes
+Returns when the file pointer is not at the end of file.
+.Va data
+contains the offset from current position to end of file,
+and may be negative.
+.It "Fifos, Pipes"
+Returns when the there is data to read;
+.Va data
+contains the number of bytes available.
+.Pp
+When the last writer disconnects, the filter will set EV_EOF in
+.Va flags .
+This may be cleared by passing in EV_CLEAR, at which point the
+filter will resume waiting for data to become available before
+returning.
+.It "BPF devices"
+Returns when the BPF buffer is full, the BPF timeout has expired, or
+when the BPF has
+.Dq immediate mode
+enabled and there is any data to read;
+.Va data
+contains the number of bytes available.
+.El
+.It EVFILT_WRITE
+Takes a descriptor as the identifier, and returns whenever
+it is possible to write to the descriptor.
+For sockets, pipes
+and fifos,
+.Va data
+will contain the amount of space remaining in the write buffer.
+The filter will set EV_EOF when the reader disconnects, and for
+the fifo case, this may be cleared by use of EV_CLEAR.
+Note that this filter is not supported for vnodes or BPF devices.
+.Pp
+For sockets, the low water mark and socket error handling is
+identical to the EVFILT_READ case.
+.It EVFILT_AIO
+The sigevent portion of the AIO request is filled in, with
+.Va sigev_notify_kqueue
+containing the descriptor of the kqueue that the event should
+be attached to,
+.Va sigev_value
+containing the udata value, and
+.Va sigev_notify
+set to SIGEV_KEVENT.
+When the
+.Fn aio_*
+system call is made, the event will be registered
+with the specified kqueue, and the
+.Va ident
+argument set to the
+.Fa struct aiocb
+returned by the
+.Fn aio_*
+system call.
+The filter returns under the same conditions as aio_error.
+.It EVFILT_VNODE
+Takes a file descriptor as the identifier and the events to watch for in
+.Va fflags ,
+and returns when one or more of the requested events occurs on the descriptor.
+The events to monitor are:
+.Bl -tag -width XXNOTE_RENAME
+.It NOTE_DELETE
+The
+.Fn unlink
+system call
+was called on the file referenced by the descriptor.
+.It NOTE_WRITE
+A write occurred on the file referenced by the descriptor.
+.It NOTE_EXTEND
+The file referenced by the descriptor was extended.
+.It NOTE_ATTRIB
+The file referenced by the descriptor had its attributes changed.
+.It NOTE_LINK
+The link count on the file changed.
+.It NOTE_RENAME
+The file referenced by the descriptor was renamed.
+.It NOTE_REVOKE
+Access to the file was revoked via
+.Xr revoke 2
+or the underlying file system was unmounted.
+.El
+.Pp
+On return,
+.Va fflags
+contains the events which triggered the filter.
+.It EVFILT_PROC
+Takes the process ID to monitor as the identifier and the events to watch for
+in
+.Va fflags ,
+and returns when the process performs one or more of the requested events.
+If a process can normally see another process, it can attach an event to it.
+The events to monitor are:
+.Bl -tag -width XXNOTE_TRACKERR
+.It NOTE_EXIT
+The process has exited.
+The exit status will be stored in
+.Va data .
+.It NOTE_FORK
+The process has called
+.Fn fork .
+.It NOTE_EXEC
+The process has executed a new process via
+.Xr execve 2
+or similar call.
+.It NOTE_TRACK
+Follow a process across
+.Fn fork
+calls.
+The parent process will return with NOTE_TRACK set in the
+.Va fflags
+field, while the child process will return with NOTE_CHILD set in
+.Va fflags
+and the parent PID in
+.Va data .
+.It NOTE_TRACKERR
+This flag is returned if the system was unable to attach an event to
+the child process, usually due to resource limitations.
+.El
+.Pp
+On return,
+.Va fflags
+contains the events which triggered the filter.
+.It EVFILT_SIGNAL
+Takes the signal number to monitor as the identifier and returns
+when the given signal is delivered to the process.
+This coexists with the
+.Fn signal
+and
+.Fn sigaction
+facilities, and has a lower precedence.
+The filter will record
+all attempts to deliver a signal to a process, even if the signal has
+been marked as SIG_IGN.
+Event notification happens after normal
+signal delivery processing.
+.Va data
+returns the number of times the signal has occurred since the last call to
+.Fn kevent .
+This filter automatically sets the EV_CLEAR flag internally.
+.It EVFILT_TIMER
+Establishes an arbitrary timer identified by
+.Va ident .
+When adding a timer,
+.Va data
+specifies the timeout period in milliseconds.
+The timer will be periodic unless EV_ONESHOT is specified.
+On return,
+.Va data
+contains the number of times the timeout has expired since the last call to
+.Fn kevent .
+This filter automatically sets the EV_CLEAR flag internally.
+There is a system wide limit on the number of timers
+which is controlled by the
+.Va kern.kq_calloutmax
+sysctl.
+.Pp
+On return,
+.Va fflags
+contains the events which triggered the filter.
+.It Dv EVFILT_USER
+Establishes a user event identified by
+.Va ident
+which is not associated with any kernel mechanism but is triggered by
+user level code.
+The lower 24 bits of the 
+.Va fflags
+may be used for user defined flags and manipulated using the following:
+.Bl -tag -width XXNOTE_FFLAGSMASK 
+.It Dv NOTE_FFNOP
+Ignore the input
+.Va fflags .
+.It Dv NOTE_FFAND
+Bitwise AND
+.Va fflags .
+.It Dv NOTE_FFOR
+Bitwise OR
+.Va fflags .
+.It Dv NOTE_COPY
+Copy
+.Va fflags .
+.It Dv NOTE_FFCTRLMASK
+Control mask for
+.Va fflags .
+.It Dv NOTE_FFLAGSMASK
+User defined flag mask for
+.Va fflags .
+.El
+.Pp
+A user event is triggered for output with the following:
+.Bl -tag -width XXNOTE_FFLAGSMASK
+.It Dv NOTE_TRIGGER
+Cause the event to be triggered.
+.El
+.Pp
+On return,
+.Va fflags
+contains the users defined flags in the lower 24 bits.
+.El
+.Sh RETURN VALUES
+The
+.Fn kqueue
+system call
+creates a new kernel event queue and returns a file descriptor.
+If there was an error creating the kernel event queue, a value of -1 is
+returned and errno set.
+.Pp
+The
+.Fn kevent
+system call
+returns the number of events placed in the
+.Fa eventlist ,
+up to the value given by
+.Fa nevents .
+If an error occurs while processing an element of the
+.Fa changelist
+and there is enough room in the
+.Fa eventlist ,
+then the event will be placed in the
+.Fa eventlist
+with
+.Dv EV_ERROR
+set in
+.Va flags
+and the system error in
+.Va data .
+Otherwise,
+.Dv -1
+will be returned, and
+.Dv errno
+will be set to indicate the error condition.
+If the time limit expires, then
+.Fn kevent
+returns 0.
+.Sh ERRORS
+The
+.Fn kqueue
+system call fails if:
+.Bl -tag -width Er
+.It Bq Er ENOMEM
+The kernel failed to allocate enough memory for the kernel queue.
+.It Bq Er EMFILE
+The per-process descriptor table is full.
+.It Bq Er ENFILE
+The system file table is full.
+.El
+.Pp
+The
+.Fn kevent
+system call fails if:
+.Bl -tag -width Er
+.It Bq Er EACCES
+The process does not have permission to register a filter.
+.It Bq Er EFAULT
+There was an error reading or writing the
+.Va kevent
+structure.
+.It Bq Er EBADF
+The specified descriptor is invalid.
+.It Bq Er EINTR
+A signal was delivered before the timeout expired and before any
+events were placed on the kqueue for return.
+.It Bq Er EINVAL
+The specified time limit or filter is invalid.
+.It Bq Er ENOENT
+The event could not be found to be modified or deleted.
+.It Bq Er ENOMEM
+No memory was available to register the event
+or, in the special case of a timer, the maximum number of
+timers has been exceeded.
+This maximum is configurable via the
+.Va kern.kq_calloutmax
+sysctl.
+.It Bq Er ESRCH
+The specified process to attach to does not exist.
+.El
+.Sh SEE ALSO
+.Xr aio_error 2 ,
+.Xr aio_read 2 ,
+.Xr aio_return 2 ,
+.Xr poll 2 ,
+.Xr read 2 ,
+.Xr select 2 ,
+.Xr sigaction 2 ,
+.Xr write 2 ,
+.Xr signal 3
+.Sh HISTORY
+The
+.Fn kqueue
+and
+.Fn kevent
+system calls first appeared in
+.Fx 4.1 .
+.Sh AUTHORS
+The
+.Fn kqueue
+system and this manual page were written by
+.An Jonathan Lemon Aq jlemon@FreeBSD.org .
+.Sh BUGS
+The
+.Fa timeout
+value is limited to 24 hours; longer timeouts will be silently
+reinterpreted as 24 hours.
diff --git a/lib/libc/sys/kse.2 b/lib/libc/sys/kse.2
new file mode 100644
index 0000000..92c1de2
--- /dev/null
+++ b/lib/libc/sys/kse.2
@@ -0,0 +1,679 @@
+.\" Copyright (c) 2002 Packet Design, LLC.
+.\" All rights reserved.
+.\"
+.\" Subject to the following obligations and disclaimer of warranty,
+.\" use and redistribution of this software, in source or object code
+.\" forms, with or without modifications are expressly permitted by
+.\" Packet Design; provided, however, that:
+.\"
+.\"    (i)  Any and all reproductions of the source or object code
+.\"         must include the copyright notice above and the following
+.\"         disclaimer of warranties; and
+.\"    (ii) No rights are granted, in any manner or form, to use
+.\"         Packet Design trademarks, including the mark "PACKET DESIGN"
+.\"         on advertising, endorsements, or otherwise except as such
+.\"         appears in the above copyright notice or in the software.
+.\"
+.\" THIS SOFTWARE IS BEING PROVIDED BY PACKET DESIGN "AS IS", AND
+.\" TO THE MAXIMUM EXTENT PERMITTED BY LAW, PACKET DESIGN MAKES NO
+.\" REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING
+.\" THIS SOFTWARE, INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED
+.\" WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE,
+.\" OR NON-INFRINGEMENT.  PACKET DESIGN DOES NOT WARRANT, GUARANTEE,
+.\" OR MAKE ANY REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS
+.\" OF THE USE OF THIS SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY,
+.\" RELIABILITY OR OTHERWISE.  IN NO EVENT SHALL PACKET DESIGN BE
+.\" LIABLE FOR ANY DAMAGES RESULTING FROM OR ARISING OUT OF ANY USE
+.\" OF THIS SOFTWARE, INCLUDING WITHOUT LIMITATION, ANY DIRECT,
+.\" INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, PUNITIVE, OR CONSEQUENTIAL
+.\" DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, LOSS OF
+.\" USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY THEORY OF
+.\" LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
+.\" THE USE OF THIS SOFTWARE, EVEN IF PACKET DESIGN IS ADVISED OF
+.\" THE POSSIBILITY OF SUCH DAMAGE.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd February 13, 2007
+.Dt KSE 2
+.Os
+.Sh NAME
+.Nm kse
+.Nd "kernel support for user threads"
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In sys/types.h
+.In sys/kse.h
+.Ft int
+.Fn kse_create "struct kse_mailbox *mbx" "int sys-scope"
+.Ft int
+.Fn kse_exit void
+.Ft int
+.Fn kse_release "struct timespec *timeout"
+.Ft int
+.Fn kse_switchin "struct kse_thr_mailbox *tmbx" "int flags"
+.Ft int
+.Fn kse_thr_interrupt "struct kse_thr_mailbox *tmbx" "int cmd" "long data"
+.Ft int
+.Fn kse_wakeup "struct kse_mailbox *mbx"
+.Sh DESCRIPTION
+These system calls implement kernel support for multi-threaded processes.
+.\"
+.Ss Overview
+.\"
+Traditionally, user threading has been implemented in one of two ways:
+either all threads are managed in user space and the kernel is unaware
+of any threading (also known as
+.Dq "N to 1" ) ,
+or else separate processes sharing
+a common memory space are created for each thread (also known as
+.Dq "N to N" ) .
+These approaches have advantages and disadvantages:
+.Bl -column "- Cannot utilize multiple CPUs" "+ Can utilize multiple CPUs"
+.It Sy "User threading	Kernel threading"
+.It "+ Lightweight	- Heavyweight"
+.It "+ User controls scheduling	- Kernel controls scheduling"
+.It "- Syscalls must be wrapped	+ No syscall wrapping required"
+.It "- Cannot utilize multiple CPUs	+ Can utilize multiple CPUs"
+.El
+.Pp
+The KSE system is a
+hybrid approach that achieves the advantages of both the user and kernel
+threading approaches.
+The underlying philosophy of the KSE system is to give kernel support
+for user threading without taking away any of the user threading library's
+ability to make scheduling decisions.
+A kernel-to-user upcall mechanism is used to pass control to the user
+threading library whenever a scheduling decision needs to be made.
+An arbitrarily number of user threads are multiplexed onto a fixed number of
+virtual CPUs supplied by the kernel.
+This can be thought of as an
+.Dq "N to M"
+threading scheme.
+.Pp
+Some general implications of this approach include:
+.Bl -bullet
+.It
+The user process can run multiple threads simultaneously on multi-processor
+machines.
+The kernel grants the process virtual CPUs to schedule as it
+wishes; these may run concurrently on real CPUs.
+.It
+All operations that block in the kernel become asynchronous, allowing
+the user process to schedule another thread when any thread blocks.
+.El
+.\"
+.Ss Definitions
+.\"
+KSE allows a user process to have multiple
+.Sy threads
+of execution in existence at the same time, some of which may be blocked
+in the kernel while others may be executing or blocked in user space.
+A
+.Sy "kernel scheduling entity"
+(KSE) is a
+.Dq "virtual CPU"
+granted to the process for the purpose of executing threads.
+A thread that is currently executing is always associated with
+exactly one KSE, whether executing in user space or in the kernel.
+The KSE is said to be
+.Sy assigned
+to the thread.
+KSEs (a user abstraction) are implemented on top
+of kernel threads using an 'upcall' entity.
+.Pp
+The KSE becomes
+.Sy unassigned ,
+and the associated thread is suspended, when the KSE has an associated
+.Sy mailbox ,
+(see below) the thread has an associated
+.Sy thread mailbox ,
+(also see below) and any of the following occurs:
+.Bl -bullet
+.It
+The thread invokes a system call that blocks.
+.It
+The thread makes any other demand of the kernel that cannot be immediately
+satisfied, e.g., touches a page of memory that needs to be fetched from disk,
+causing a page fault.
+.It
+Another thread that was previously blocked in the kernel completes its
+work in the kernel (or is
+.Sy interrupted )
+and becomes ready to return to user space, and the current thread is returning
+to user space.
+.It
+A signal is delivered to the process, and this KSE is chosen to deliver it.
+.El
+.Pp
+In other words, as soon as there is a scheduling decision to be made,
+the KSE becomes unassigned, because the kernel does not presume to know
+how the process' other runnable threads should be scheduled.
+Unassigned KSEs always return to user space as soon as possible via
+the
+.Sy upcall
+mechanism (described below), allowing the user process to decide how
+that KSE should be utilized next.
+KSEs always complete as much work as possible in the kernel before
+becoming unassigned.
+.Pp
+Individual KSEs within a process are effectively indistinguishable,
+and any KSE in a process may be assigned by the kernel to any runnable
+(in the kernel) thread associated with that process.
+In practice, the kernel attempts to preserve the affinity between threads
+and actual CPUs to optimize cache behavior, but this is invisible to the
+user process.
+(Affinity is not yet fully implemented.)
+.Pp
+Each KSE has a unique
+.Sy "KSE mailbox"
+supplied by the user process.
+A mailbox consists of a control structure containing a pointer to an
+.Sy "upcall function"
+and a user stack.
+The KSE invokes this function whenever it becomes unassigned.
+The kernel updates this structure with information about threads that have
+become runnable and signals that have been delivered before each upcall.
+Upcalls may be temporarily blocked by the user thread scheduling code
+during critical sections.
+.Pp
+Each user thread has a unique
+.Sy "thread mailbox"
+as well.
+Threads are referred to using pointers to these mailboxes when communicating
+between the kernel and the user thread scheduler.
+Each KSE's mailbox contains a pointer to the mailbox of the user thread
+that the KSE is currently executing.
+This pointer is saved when the thread blocks in the kernel.
+.Pp
+Whenever a thread blocked in the kernel is ready to return to user space,
+it is added to the process's list of
+.Sy completed
+threads.
+This list is presented to the user code at the next upcall as a linked list
+of thread mailboxes.
+.Pp
+There is a kernel-imposed limit on the number of threads in a process
+that may be simultaneously blocked in the kernel (this number is not
+currently visible to the user).
+When this limit is reached, upcalls are blocked and no work is performed
+for the process until one of the threads completes (or a signal is
+received).
+.\"
+.Ss Managing KSEs
+.\"
+To become multi-threaded, a process must first invoke
+.Fn kse_create .
+The
+.Fn kse_create
+system call
+creates a new KSE (except for the very first invocation; see below).
+The KSE will be associated with the mailbox pointed to by
+.Fa mbx .
+If
+.Fa sys_scope
+is non-zero, then the new thread will be counted as a system scope
+thread. Other things must be done as well to make a system scope thread
+so this is not sufficient (yet).
+System scope variables are not covered
+in detail in this manual page yet, but briefly, they never perform
+upcalls and do not return to the user thread scheduler.
+Once launched they run autonomously.
+The pthreads library knows how to make system
+scope threads and users are encouraged to use the library interface.
+.Pp
+Each process initially has a single KSE executing a single user thread.
+Since the KSE does not have an associated mailbox, it must remain assigned
+to the thread and does not perform any upcalls.
+(It is by definition a system scope thread).
+The result is the traditional, unthreaded mode of operation.
+Therefore, as a special case, the first call to
+.Fn kse_create
+by this initial thread with
+.Fa sys_scope
+equal to zero does not create a new KSE; instead, it simply associates the
+current KSE with the supplied KSE mailbox, and no immediate upcall results.
+However, an upcall will be triggered the next time the thread blocks and
+the required conditions are met.
+.Pp
+The kernel does not allow more KSEs to exist in a process than the
+number of physical CPUs in the system (this number is available as the
+.Xr sysctl 3
+variable
+.Va hw.ncpu ) .
+Having more KSEs than CPUs would not add any value to the user process,
+as the additional KSEs would just compete with each other for access to
+the real CPUs.
+Since the extra KSEs would always be side-lined, the result
+to the application would be exactly the same as having fewer KSEs.
+There may however be arbitrarily many user threads, and it is up to the
+user thread scheduler to handle mapping the application's user threads
+onto the available KSEs.
+.Pp
+The
+.Fn kse_exit
+system call
+causes the KSE assigned to the currently running thread to be destroyed.
+If this KSE is the last one in the process, there must be no remaining
+threads associated with that process blocked in the kernel.
+This system call does not return unless there is an error.
+Calling
+.Fn kse_exit
+from the last thread is the same as calling
+.Fn exit .
+.Pp
+The
+.Fn kse_release
+system call
+is used to
+.Dq park
+the KSE assigned to the currently running thread when it is not needed,
+e.g., when there are more available KSEs than runnable user threads.
+The thread converts to an upcall but does not get scheduled until
+there is a new reason to do so, e.g., a previously
+blocked thread becomes runnable, or the timeout expires.
+If successful,
+.Fn kse_release
+does not return to the caller.
+.Pp
+The
+.Fn kse_switchin
+system call can be used by the UTS, when it has selected a new thread,
+to switch to the context of that thread.
+The use of
+.Fn kse_switchin
+is machine dependent.
+Some platforms do not need a system call to switch to a new context,
+while others require its use in particular cases.
+.Pp
+The
+.Fn kse_wakeup
+system call
+is the opposite of
+.Fn kse_release .
+It causes the (parked) KSE associated with the mailbox pointed to by
+.Fa mbx
+to be woken up, causing it to upcall.
+If the KSE has already woken up for another reason, this system call has no
+effect.
+The
+.Fa mbx
+argument
+may be
+.Dv NULL
+to specify
+.Dq "any KSE in the current process" .
+.Pp
+The
+.Fn kse_thr_interrupt
+system call
+is used to interrupt a currently blocked thread.
+The thread must either be blocked in the kernel or assigned to a KSE
+(i.e., executing).
+The thread is then marked as interrupted.
+As soon as the thread invokes an interruptible system call (or immediately
+for threads already blocked in one), the thread will be made runnable again,
+even though the kernel operation may not have completed.
+The effect on the interrupted system call is the same as if it had been
+interrupted by a signal; typically this means an error is returned with
+.Va errno
+set to
+.Er EINTR .
+.\"
+.Ss Signals
+.\"
+The current implementation creates a special signal thread.
+Kernel threads (KSEs) in a process mask all signals, and only the signal
+thread waits for signals to be delivered to the process, the signal thread
+is responsible
+for dispatching signals to user threads.
+.Pp
+A downside of this is that if a multiplexed thread
+calls the
+.Fn execve
+syscall, its signal mask and pending signals may not be
+available in the kernel.
+They are stored
+in userland and the kernel does not know where to get them, however
+.Tn POSIX
+requires them to be restored and passed them to new process.
+Just setting the mask for the thread before calling
+.Fn execve
+is only a
+close approximation to the problem as it does not re-deliver back to the kernel
+any pending signals that the old process may have blocked, and it allows a
+window in which new signals may be delivered to the process between the setting
+of the mask and the
+.Fn execve .
+.Pp
+For now this problem has been solved by adding a special combined
+.Fn kse_thr_interrupt Ns / Ns Fn execve
+mode to the
+.Fn kse_thr_interrupt
+syscall.
+The
+.Fn kse_thr_interrupt
+syscall has a sub command
+.Dv KSE_INTR_EXECVE ,
+that allows it to accept a
+.Vt kse_execv_args
+structure, and allowing it to adjust the signals and then atomically
+convert into an
+.Fn execve
+call.
+Additional pending signals and the correct signal mask can be passed
+to the kernel in this way.
+The thread library overrides the
+.Fn execve
+syscall
+and translates it into
+.Fn kse_intr_interrupt
+call, allowing a multiplexed thread
+to restore pending signals and the correct signal mask before doing the
+.Fn exec .
+This solution to the problem may change.
+.\"
+.Ss KSE Mailboxes
+.\"
+Each KSE has a unique mailbox for user-kernel communication defined in
+.In sys/kse.h .
+Some of the fields there are:
+.Pp
+.Va km_version
+describes the version of this structure and must be equal to
+.Dv KSE_VER_0 .
+.Va km_udata
+is an opaque pointer ignored by the kernel.
+.Pp
+.Va km_func
+points to the KSE's upcall function;
+it will be invoked using
+.Va km_stack ,
+which must remain valid for the lifetime of the KSE.
+.Pp
+.Va km_curthread
+always points to the thread that is currently assigned to this KSE if any,
+or
+.Dv NULL
+otherwise.
+This field is modified by both the kernel and the user process as follows.
+.Pp
+When
+.Va km_curthread
+is not
+.Dv NULL ,
+it is assumed to be pointing at the mailbox for the currently executing
+thread, and the KSE may be unassigned, e.g., if the thread blocks in the
+kernel.
+The kernel will then save the contents of
+.Va km_curthread
+with the blocked thread, set
+.Va km_curthread
+to
+.Dv NULL ,
+and upcall to invoke
+.Fn km_func .
+.Pp
+When
+.Va km_curthread
+is
+.Dv NULL ,
+the kernel will never perform any upcalls with this KSE; in other words,
+the KSE remains assigned to the thread even if it blocks.
+.Va km_curthread
+must be
+.Dv NULL
+while the KSE is executing critical user thread scheduler
+code that would be disrupted by an intervening upcall;
+in particular, while
+.Fn km_func
+itself is executing.
+.Pp
+Before invoking
+.Fn km_func
+in any upcall, the kernel always sets
+.Va km_curthread
+to
+.Dv NULL .
+Once the user thread scheduler has chosen a new thread to run,
+it should point
+.Va km_curthread
+at the thread's mailbox, re-enabling upcalls, and then resume the thread.
+.Em Note :
+modification of
+.Va km_curthread
+by the user thread scheduler must be atomic
+with the loading of the context of the new thread, to avoid
+the situation where the thread context area
+may be modified by a blocking async operation, while there
+is still valid information to be read out of it.
+.Pp
+.Va km_completed
+points to a linked list of user threads that have completed their work
+in the kernel since the last upcall.
+The user thread scheduler should put these threads back into its
+own runnable queue.
+Each thread in a process that completes a kernel operation
+(synchronous or asynchronous) that results in an upcall is guaranteed to be
+linked into exactly one KSE's
+.Va km_completed
+list; which KSE in the group, however, is indeterminate.
+Furthermore, the completion will be reported in only one upcall.
+.Pp
+.Va km_sigscaught
+contains the list of signals caught by this process since the previous
+upcall to any KSE in the process.
+As long as there exists one or more KSEs with an associated mailbox in
+the user process, signals are delivered this way rather than the
+traditional way.
+(This has not been implemented and may change.)
+.Pp
+.Va km_timeofday
+is set by the kernel to the current system time before performing
+each upcall.
+.Pp
+.Va km_flags
+may contain any of the following bits OR'ed together:
+.Bl -tag -width indent
+.It Dv KMF_NOUPCALL
+Block upcalls from happening.
+The thread is in some critical section.
+.It Dv KMF_NOCOMPLETED , KMF_DONE , KMF_BOUND
+This thread should be considered to be permanently bound to
+its KSE, and treated much like a non-threaded process would be.
+It is a
+.Dq "long term"
+version of
+.Dv KMF_NOUPCALL
+in some ways.
+.It Dv KMF_WAITSIGEVENT
+Implement characteristics needed for the signal delivery thread.
+.El
+.\"
+.Ss Thread Mailboxes
+.\"
+Each user thread must have associated with it a unique
+.Vt "struct kse_thr_mailbox"
+as defined in
+.In sys/kse.h .
+It includes the following fields.
+.Pp
+.Va tm_udata
+is an opaque pointer ignored by the kernel.
+.Pp
+.Va tm_context
+stores the context for the thread when the thread is blocked in user space.
+This field is also updated by the kernel before a completed thread is returned
+to the user thread scheduler via
+.Va km_completed .
+.Pp
+.Va tm_next
+links the
+.Va km_completed
+threads together when returned by the kernel with an upcall.
+The end of the list is marked with a
+.Dv NULL
+pointer.
+.Pp
+.Va tm_uticks
+and
+.Va tm_sticks
+are time counters for user mode and kernel mode execution, respectively.
+These counters count ticks of the statistics clock (see
+.Xr clocks 7 ) .
+While any thread is actively executing in the kernel, the corresponding
+.Va tm_sticks
+counter is incremented.
+While any KSE is executing in user space and that KSE's
+.Va km_curthread
+pointer is not equal to
+.Dv NULL ,
+the corresponding
+.Va tm_uticks
+counter is incremented.
+.Pp
+.Va tm_flags
+may contain any of the following bits OR'ed together:
+.Bl -tag -width indent
+.It Dv TMF_NOUPCALL
+Similar to
+.Dv KMF_NOUPCALL .
+This flag inhibits upcalling for critical sections.
+Some architectures require this to be in one place and some in the other.
+.El
+.Sh RETURN VALUES
+The
+.Fn kse_create ,
+.Fn kse_wakeup ,
+and
+.Fn kse_thr_interrupt
+system calls
+return zero if successful.
+The
+.Fn kse_exit
+and
+.Fn kse_release
+system calls
+do not return if successful.
+.Pp
+All of these system calls return a non-zero error code in case of an error.
+.Sh ERRORS
+The
+.Fn kse_create
+system call
+will fail if:
+.Bl -tag -width Er
+.It Bq Er ENXIO
+There are already as many KSEs in the process as hardware processors.
+.It Bq Er EAGAIN
+The user is not the super user, and the soft resource limit corresponding
+to the
+.Fa resource
+argument
+.Dv RLIMIT_NPROC
+would be exceeded (see
+.Xr getrlimit 2 ) .
+.It Bq Er EFAULT
+The
+.Fa mbx
+argument
+points to an address which is not a valid part of the process address space.
+.El
+.Pp
+The
+.Fn kse_exit
+system call
+will fail if:
+.Bl -tag -width Er
+.It Bq Er EDEADLK
+The current KSE is the last in its process and there are still one or more
+threads associated with the process blocked in the kernel.
+.It Bq Er ESRCH
+The current KSE has no associated mailbox, i.e., the process is operating
+in traditional, unthreaded mode (in this case use
+.Xr _exit 2
+to exit the process).
+.El
+.Pp
+The
+.Fn kse_release
+system call
+will fail if:
+.Bl -tag -width Er
+.It Bq Er ESRCH
+The current KSE has no associated mailbox, i.e., the process is operating is
+traditional, unthreaded mode.
+.El
+.Pp
+The
+.Fn kse_wakeup
+system call
+will fail if:
+.Bl -tag -width Er
+.It Bq Er ESRCH
+The
+.Fa mbx
+argument
+is not
+.Dv NULL
+and the mailbox pointed to by
+.Fa mbx
+is not associated with any KSE in the process.
+.It Bq Er ESRCH
+The
+.Fa mbx
+argument
+is
+.Dv NULL
+and the current KSE has no associated mailbox, i.e., the process is operating
+in traditional, unthreaded mode.
+.El
+.Pp
+The
+.Fn kse_thr_interrupt
+system call
+will fail if:
+.Bl -tag -width Er
+.It Bq Er ESRCH
+The thread corresponding to
+.Fa tmbx
+is neither currently assigned to any KSE in the process nor blocked in the
+kernel.
+.El
+.Sh SEE ALSO
+.Xr rfork 2 ,
+.Xr pthread 3 ,
+.Xr ucontext 3
+.Rs
+.%A "Thomas E. Anderson"
+.%A "Brian N. Bershad"
+.%A "Edward D. Lazowska"
+.%A "Henry M. Levy"
+.%J "ACM Transactions on Computer Systems"
+.%N Issue 1
+.%V Volume 10
+.%D February 1992
+.%I ACM Press
+.%P pp. 53-79
+.%T "Scheduler activations: effective kernel support for the user-level management of parallelism"
+.Re
+.Sh HISTORY
+The KSE system calls first appeared in
+.Fx 5.0 .
+.Sh AUTHORS
+KSE was originally implemented by
+.An -nosplit
+.An "Julian Elischer" Aq julian@FreeBSD.org ,
+with additional contributions by
+.An "Jonathan Mini" Aq mini@FreeBSD.org ,
+.An "Daniel Eischen" Aq deischen@FreeBSD.org ,
+and
+.An "David Xu" Aq davidxu@FreeBSD.org .
+.Pp
+This manual page was written by
+.An "Archie Cobbs" Aq archie@FreeBSD.org .
+.Sh BUGS
+The KSE code is
+.Ud .
diff --git a/lib/libc/sys/ktrace.2 b/lib/libc/sys/ktrace.2
new file mode 100644
index 0000000..aaf6192
--- /dev/null
+++ b/lib/libc/sys/ktrace.2
@@ -0,0 +1,196 @@
+.\" Copyright (c) 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"     @(#)ktrace.2	8.1 (Berkeley) 6/4/93
+.\" $FreeBSD$
+.\"
+.Dd July 13, 2008
+.Dt KTRACE 2
+.Os
+.Sh NAME
+.Nm ktrace
+.Nd process tracing
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In sys/param.h
+.In sys/time.h
+.In sys/uio.h
+.In sys/ktrace.h
+.Ft int
+.Fn ktrace "const char *tracefile" "int ops" "int trpoints" "int pid"
+.Sh DESCRIPTION
+The
+.Fn ktrace
+system call enables or disables tracing of one or more processes.
+Users may only trace their own processes.
+Only the super-user can trace setuid or setgid programs.
+.Pp
+The
+.Fa tracefile
+argument
+gives the pathname of the file to be used for tracing.
+The file must exist and be a regular file writable by the calling process.
+All trace records are always appended to the file,
+so the file must be truncated to zero length to discard
+previous trace data.
+If tracing points are being disabled (see KTROP_CLEAR below),
+.Fa tracefile
+may be NULL.
+.Pp
+The
+.Fa ops
+argument specifies the requested ktrace operation.
+The defined operations are:
+.Bl -column KTRFLAG_DESCENDXXX -offset indent
+.It "KTROP_SET	Enable trace points specified in"
+.Fa trpoints .
+.It "KTROP_CLEAR	Disable trace points specified in
+.Fa trpoints .
+.It "KTROP_CLEARFILE	Stop all tracing."
+.It "KTRFLAG_DESCEND	The tracing change should apply to the"
+specified process and all its current children.
+.El
+.Pp
+The
+.Fa trpoints
+argument specifies the trace points of interest.
+The defined trace points are:
+.Bl -column KTRFAC_SYSCALLXXX -offset indent
+.It "KTRFAC_SYSCALL	Trace system calls."
+.It "KTRFAC_SYSRET	Trace return values from system calls."
+.It "KTRFAC_NAMEI	Trace name lookup operations."
+.It "KTRFAC_GENIO	Trace all I/O (note that this option can"
+generate much output).
+.It "KTRFAC_PSIG	Trace posted signals."
+.It "KTRFAC_CSW	Trace context switch points."
+.It "KTRFAC_INHERIT	Inherit tracing to future children."
+.El
+.Pp
+Each tracing event outputs a record composed of a generic header
+followed by a trace point specific structure.
+The generic header is:
+.Bd -literal
+struct ktr_header {
+	int	ktr_len;		/* length of buf */
+	short	ktr_type;		/* trace record type */
+	pid_t	ktr_pid;		/* process id */
+	char	ktr_comm[MAXCOMLEN+1];	/* command name */
+	struct	timeval ktr_time;	/* timestamp */
+	intptr_t	ktr_tid;	/* was ktr_buffer */
+};
+.Ed
+.Pp
+The
+.Va ktr_len
+field specifies the length of the
+.Va ktr_type
+data that follows this header.
+The
+.Va ktr_pid
+and
+.Va ktr_comm
+fields specify the process and command generating the record.
+The
+.Va ktr_time
+field gives the time (with microsecond resolution)
+that the record was generated.
+The
+.Va ktr_tid
+field holds a threadid.
+.Pp
+The generic header is followed by
+.Va ktr_len
+bytes of a
+.Va ktr_type
+record.
+The type specific records are defined in the
+.In sys/ktrace.h
+include file.
+.Sh SYSCTL TUNABLES
+The following
+.Xr sysctl 8
+tunables influence the behaviour of
+.Fn ktrace :
+.Bl -tag -width indent
+.It Va kern.ktrace.geniosize
+bounds the amount of data a traced I/O request will log
+to the trace file.
+.It Va kern.ktrace.request_pool
+bounds the number of trace events being logged at a time.
+.El
+.Pp
+Sysctl tunables that control process debuggability (as determined by
+.Xr p_candebug 9 )
+also affect the operation of
+.Fn ktrace .
+.Sh RETURN VALUES
+.Rv -std ktrace
+.Sh ERRORS
+The
+.Fn ktrace
+system call
+will fail if:
+.Bl -tag -width Er
+.It Bq Er ENOTDIR
+A component of the path prefix is not a directory.
+.It Bq Er ENAMETOOLONG
+A component of a pathname exceeded 255 characters,
+or an entire path name exceeded 1023 characters.
+.It Bq Er ENOENT
+The named tracefile does not exist.
+.It Bq Er EACCES
+Search permission is denied for a component of the path prefix.
+.It Bq Er ELOOP
+Too many symbolic links were encountered in translating the pathname.
+.It Bq Er EIO
+An I/O error occurred while reading from or writing to the file system.
+.It Bq Er ENOSYS
+The kernel was not compiled with
+.Nm
+support.
+.El
+.Pp
+A thread may be unable to log one or more tracing events due to a
+temporary shortage of resources.
+This condition is remembered by the kernel, and the next tracing request
+that succeeds will have the flag
+.Li KTR_DROP
+set in its
+.Va ktr_type
+field.
+.Sh SEE ALSO
+.Xr kdump 1 ,
+.Xr ktrace 1 ,
+.Xr utrace 2 ,
+.Xr sysctl 8 ,
+.Xr p_candebug 9
+.Sh HISTORY
+The
+.Fn ktrace
+system call first appeared in
+.Bx 4.4 .
diff --git a/lib/libc/sys/link.2 b/lib/libc/sys/link.2
new file mode 100644
index 0000000..e1fc317
--- /dev/null
+++ b/lib/libc/sys/link.2
@@ -0,0 +1,288 @@
+.\" Copyright (c) 1980, 1991, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"     @(#)link.2	8.3 (Berkeley) 1/12/94
+.\" $FreeBSD$
+.\"
+.Dd April 10, 2008
+.Dt LINK 2
+.Os
+.Sh NAME
+.Nm link ,
+.Nm linkat
+.Nd make a hard file link
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In unistd.h
+.Ft int
+.Fn link "const char *name1" "const char *name2"
+.Ft int
+.Fo linkat
+.Fa "int fd1" "const char *name1" "int fd2" "const char *name2" "int flag"
+.Fc
+.Sh DESCRIPTION
+The
+.Fn link
+system call
+atomically creates the specified directory entry (hard link)
+.Fa name2
+with the attributes of the underlying object pointed at by
+.Fa name1 .
+If the link is successful: the link count of the underlying object
+is incremented;
+.Fa name1
+and
+.Fa name2
+share equal access and rights
+to the
+underlying object.
+.Pp
+If
+.Fa name1
+is removed, the file
+.Fa name2
+is not deleted and the link count of the
+underlying object is
+decremented.
+.Pp
+The object pointed at by the
+.Fa name1
+argument
+must exist for the hard link to
+succeed and
+both
+.Fa name1
+and
+.Fa name2
+must be in the same file system.
+The
+.Fa name1
+argument
+may not be a directory.
+.Pp
+The
+.Fn linkat
+system call is equivalent to
+.Fa link
+except in the case where either
+.Fa name1
+or
+.Fa name2
+or both are relative paths.
+In this case a relative path
+.Fa name1
+is interpreted relative to
+the directory associated with the file descriptor
+.Fa fd1
+instead of the current working directory and similarly for
+.Fa name2
+and the file descriptor
+.Fa fd2 .
+.Pp
+Values for
+.Fa flag
+are constructed by a bitwise-inclusive OR of flags from the following
+list, defined in
+.In fcntl.h :
+.Bl -tag -width indent
+.It Dv AT_SYMLINK_FOLLOW
+If
+.Fa name1
+names a symbolic link, a new link for the target of the symbolic link is
+created.
+.El
+.Pp
+If
+.Fn linkat
+is passed the special value
+.Dv AT_FDCWD
+in the
+.Fa fd1
+or
+.Fa fd2
+parameter, the current working directory is used for the respective
+.Fa name
+argument.
+If both
+.Fa fd1
+and
+.Fa fd2
+have value
+.Dv AT_FDCWD ,
+the behavior is identical to a call to
+.Fn link .
+Unless
+.Fa flag
+contains the
+.Dv AT_SYMLINK_FOLLOW
+flag, if
+.Fa name1
+names a symbolic link, a new link is created for the symbolic link
+.Fa name1
+and not its target.
+.Sh RETURN VALUES
+.Rv -std link
+.Sh ERRORS
+The
+.Fn link
+system call
+will fail and no link will be created if:
+.Bl -tag -width Er
+.It Bq Er ENOTDIR
+A component of either path prefix is not a directory.
+.It Bq Er ENAMETOOLONG
+A component of either pathname exceeded 255 characters,
+or entire length of either path name exceeded 1023 characters.
+.It Bq Er ENOENT
+A component of either path prefix does not exist.
+.It Bq Er EOPNOTSUPP
+The file system containing the file named by
+.Fa name1
+does not support links.
+.It Bq Er EMLINK
+The link count of the file named by
+.Fa name1
+would exceed 32767.
+.It Bq Er EACCES
+A component of either path prefix denies search permission.
+.It Bq Er EACCES
+The requested link requires writing in a directory with a mode
+that denies write permission.
+.It Bq Er ELOOP
+Too many symbolic links were encountered in translating one of the pathnames.
+.It Bq Er ENOENT
+The file named by
+.Fa name1
+does not exist.
+.It Bq Er EEXIST
+The link named by
+.Fa name2
+does exist.
+.It Bq Er EPERM
+The file named by
+.Fa name1
+is a directory.
+.It Bq Er EPERM
+The file named by
+.Fa name1
+has its immutable or append-only flag set, see the
+.Xr chflags 2
+manual page for more information.
+.It Bq Er EPERM
+The parent directory of the file named by
+.Fa name2
+has its immutable flag set.
+.It Bq Er EXDEV
+The link named by
+.Fa name2
+and the file named by
+.Fa name1
+are on different file systems.
+.It Bq Er ENOSPC
+The directory in which the entry for the new link is being placed
+cannot be extended because there is no space left on the file
+system containing the directory.
+.It Bq Er EDQUOT
+The directory in which the entry for the new link
+is being placed cannot be extended because the
+user's quota of disk blocks on the file system
+containing the directory has been exhausted.
+.It Bq Er EIO
+An I/O error occurred while reading from or writing to
+the file system to make the directory entry.
+.It Bq Er EROFS
+The requested link requires writing in a directory on a read-only file
+system.
+.It Bq Er EFAULT
+One of the pathnames specified
+is outside the process's allocated address space.
+.El
+.Pp
+In addition to the errors returned by the
+.Fn link ,
+the
+.Fn linkat
+system call may fail if:
+.Bl -tag -width Er
+.It Bq Er EBADF
+The
+.Fa name1
+or
+.Fa name2
+argument does not specify an absolute path and the
+.Fa fd1
+or
+.Fa fd2
+argument, respectively, is neither
+.Dv AT_FDCWD
+nor a valid file descriptor open for searching.
+.It Bq Er EINVAL
+The value of the
+.Fa flag
+argument is not valid.
+.It Bq Er ENOTDIR
+The
+.Fa name1
+or
+.Fa name2
+argument is not an absolute path and
+.Fa fd1
+or
+.Fa fd2 ,
+respectively, is neither
+.Dv AT_FDCWD
+nor a file descriptor associated with a directory.
+.El
+.Sh SEE ALSO
+.Xr chflags 2 ,
+.Xr readlink 2 ,
+.Xr symlink 2 ,
+.Xr unlink 2
+.Sh STANDARDS
+The
+.Fn link
+system call is expected to conform to
+.St -p1003.1-90 .
+The
+.Fn linkat
+system call follows The Open Group Extended API Set 2 specification.
+.Sh HISTORY
+The
+.Fn link
+function appeared in
+.At v7 .
+The
+.Fn linkat
+system call appeared in
+.Fx 8.0 .
+.Pp
+The
+.Fn link
+system call traditionally allows the super-user to link directories which
+corrupts the file system coherency.
+This implementation no longer permits it.
diff --git a/lib/libc/sys/lio_listio.2 b/lib/libc/sys/lio_listio.2
new file mode 100644
index 0000000..0ffbcdd
--- /dev/null
+++ b/lib/libc/sys/lio_listio.2
@@ -0,0 +1,175 @@
+.\" Copyright (c) 2003 Tim J. Robbins
+.\" All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd January 12, 2003
+.Dt LIO_LISTIO 2
+.Os
+.Sh NAME
+.Nm lio_listio
+.Nd "list directed I/O (REALTIME)"
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In aio.h
+.Ft int
+.Fo lio_listio
+.Fa "int mode"
+.Fa "struct aiocb * const list[]"
+.Fa "int nent"
+.Fa "struct sigevent *sig"
+.Fc
+.Sh DESCRIPTION
+The
+.Fn lio_listio
+function initiates a list of I/O requests with a single function call.
+The
+.Fa list
+argument is an array of pointers to
+.Vt aiocb
+structures describing each operation to perform,
+with
+.Fa nent
+elements.
+.Dv NULL
+elements are ignored.
+.Pp
+The
+.Va aio_lio_opcode
+field of each
+.Vt aiocb
+specifies the operation to be performed.
+The following operations are supported:
+.Bl -tag -width ".Dv LIO_WRITE"
+.It Dv LIO_READ
+Read data as if by a call to
+.Xr aio_read 2 .
+.It Dv LIO_NOP
+No operation.
+.It Dv LIO_WRITE
+Write data as if by a call to
+.Xr aio_write 2 .
+.El
+.Pp
+If the
+.Fa mode
+argument is
+.Dv LIO_WAIT ,
+.Fn lio_listio
+does not return until all the requested operations have been completed.
+If
+.Fa mode
+is
+.Dv LIO_NOWAIT ,
+the requests are processed asynchronously, and the signal specified by
+.Fa sig
+is sent when all operations have completed.
+If
+.Fa sig
+is
+.Dv NULL ,
+the calling process is not notified of I/O completion.
+.Pp
+The order in which the requests are carried out is not specified;
+in particular, there is no guarantee that they will be executed in
+the order 0, 1, ...,
+.Fa nent Ns \-1 .
+.Sh RETURN VALUES
+If
+.Fa mode
+is
+.Dv LIO_WAIT ,
+the
+.Fn lio_listio
+function returns 0 if the operations completed successfully,
+otherwise \-1.
+.Pp
+If
+.Fa mode
+is
+.Dv LIO_NOWAIT ,
+the
+.Fn lio_listio
+function returns 0 if the operations are successfully queued,
+otherwise \-1.
+.Sh ERRORS
+The
+.Fn lio_listio
+function will fail if:
+.Bl -tag -width Er
+.It Bq Er EAGAIN
+There are not enough resources to enqueue the requests.
+.It Bq Er EAGAIN
+The request would cause the system-wide limit
+.Dv AIO_MAX
+to be exceeded.
+.It Bq Er EINVAL
+The
+.Fa mode
+argument is neither
+.Dv LIO_WAIT
+nor
+.Dv LIO_NOWAIT ,
+or
+.Fa nent
+is greater than
+.Dv AIO_LISTIO_MAX .
+.It Bq Er EINTR
+A signal interrupted the system call before it could be completed.
+.It Bq Er EIO
+One or more requests failed.
+.El
+.Pp
+In addition, the
+.Fn lio_listio
+function may fail for any of the reasons listed for
+.Xr aio_read 2
+and
+.Xr aio_write 2 .
+.Pp
+If
+.Fn lio_listio
+succeeds, or fails with an error code of
+.Er EAGAIN , EINTR ,
+or
+.Er EIO ,
+some of the requests may have been initiated.
+The caller should check the error status of each
+.Vt aiocb
+structure individually by calling
+.Xr aio_error 2 .
+.Sh SEE ALSO
+.Xr aio_error 2 ,
+.Xr aio_read 2 ,
+.Xr aio_write 2 ,
+.Xr read 2 ,
+.Xr write 2 ,
+.Xr siginfo 3 ,
+.Xr aio 4
+.Sh STANDARDS
+The
+.Fn lio_listio
+function is expected to conform to
+.St -p1003.1-2001 .
diff --git a/lib/libc/sys/listen.2 b/lib/libc/sys/listen.2
new file mode 100644
index 0000000..bd6abde
--- /dev/null
+++ b/lib/libc/sys/listen.2
@@ -0,0 +1,170 @@
+.\" Copyright (c) 1983, 1991, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"	From: @(#)listen.2	8.2 (Berkeley) 12/11/93
+.\" $FreeBSD$
+.\"
+.Dd August 29, 2005
+.Dt LISTEN 2
+.Os
+.Sh NAME
+.Nm listen
+.Nd listen for connections on a socket
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In sys/types.h
+.In sys/socket.h
+.Ft int
+.Fn listen "int s" "int backlog"
+.Sh DESCRIPTION
+To accept connections, a socket
+is first created with
+.Xr socket 2 ,
+a willingness to accept incoming connections and
+a queue limit for incoming connections are specified with
+.Fn listen ,
+and then the connections are
+accepted with
+.Xr accept 2 .
+The
+.Fn listen
+system call applies only to sockets of type
+.Dv SOCK_STREAM
+or
+.Dv SOCK_SEQPACKET .
+.Pp
+The
+.Fa backlog
+argument defines the maximum length the queue of
+pending connections may grow to.
+The real maximum queue length will be 1.5 times more than the value
+specified in the
+.Fa backlog
+argument.
+A subsequent
+.Fn listen
+system call on the listening socket allows the caller to change the maximum
+queue length using a new
+.Fa backlog
+argument.
+If a connection
+request arrives with the queue full the client may
+receive an error with an indication of
+.Er ECONNREFUSED ,
+or, in the case of TCP, the connection will be
+silently dropped.
+.Pp
+Current queue lengths of listening sockets can be queried using
+.Xr netstat 1
+command.
+.Pp
+Note that before
+.Fx 4.5
+and the introduction of the syncache,
+the
+.Fa backlog
+argument also determined the length of the incomplete
+connection queue, which held TCP sockets in the process
+of completing TCP's 3-way handshake.
+These incomplete connections
+are now held entirely in the syncache, which is unaffected by
+queue lengths.
+Inflated
+.Fa backlog
+values to help handle denial
+of service attacks are no longer necessary.
+.Pp
+The
+.Xr sysctl 3
+MIB variable
+.Va kern.ipc.somaxconn
+specifies a hard limit on
+.Fa backlog ;
+if a value greater than
+.Va kern.ipc.somaxconn
+or less than zero is specified,
+.Fa backlog
+is silently forced to
+.Va kern.ipc.somaxconn .
+.Sh INTERACTION WITH ACCEPT FILTERS
+When accept filtering is used on a socket, a second queue will
+be used to hold sockets that have connected, but have not yet
+met their accept filtering criteria.
+Once the criteria has been
+met, these sockets will be moved over into the completed connection
+queue to be
+.Xr accept 2 Ns ed .
+If this secondary queue is full and a
+new connection comes in, the oldest socket which has not yet met
+its accept filter criteria will be terminated.
+.Pp
+This secondary queue, like the primary listen queue, is sized
+according to the
+.Fa backlog
+argument.
+.Sh RETURN VALUES
+.Rv -std listen
+.Sh ERRORS
+The
+.Fn listen
+system call
+will fail if:
+.Bl -tag -width Er
+.It Bq Er EBADF
+The argument
+.Fa s
+is not a valid descriptor.
+.It Bq Er EINVAL
+The socket is already connected, or in the process of being connected.
+.It Bq Er ENOTSOCK
+The argument
+.Fa s
+is not a socket.
+.It Bq Er EOPNOTSUPP
+The socket is not of a type that supports the operation
+.Fn listen .
+.El
+.Sh SEE ALSO
+.Xr netstat 1 ,
+.Xr accept 2 ,
+.Xr connect 2 ,
+.Xr socket 2 ,
+.Xr sysctl 3 ,
+.Xr sysctl 8 ,
+.Xr accept_filter 9
+.Sh HISTORY
+The
+.Fn listen
+system call appeared in
+.Bx 4.2 .
+The ability to configure the maximum
+.Fa backlog
+at run-time, and to use a negative
+.Fa backlog
+to request the maximum allowable value, was introduced in
+.Fx 2.2 .
diff --git a/lib/libc/sys/lseek.2 b/lib/libc/sys/lseek.2
new file mode 100644
index 0000000..874c523
--- /dev/null
+++ b/lib/libc/sys/lseek.2
@@ -0,0 +1,209 @@
+.\" Copyright (c) 1980, 1991, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"     @(#)lseek.2	8.3 (Berkeley) 4/19/94
+.\" $FreeBSD$
+.\"
+.Dd April 5, 2007
+.Dt LSEEK 2
+.Os
+.Sh NAME
+.Nm lseek
+.Nd reposition read/write file offset
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In unistd.h
+.Ft off_t
+.Fn lseek "int fildes" "off_t offset" "int whence"
+.Sh DESCRIPTION
+The
+.Fn lseek
+system call repositions the offset of the file descriptor
+.Fa fildes
+to the
+argument
+.Fa offset
+according to the directive
+.Fa whence .
+The argument
+.Fa fildes
+must be an open
+file descriptor.
+The
+.Fn lseek
+system call
+repositions the file position pointer associated with the file
+descriptor
+.Fa fildes
+as follows:
+.Bl -item -offset indent
+.It
+If
+.Fa whence
+is
+.Dv SEEK_SET ,
+the offset is set to
+.Fa offset
+bytes.
+.It
+If
+.Fa whence
+is
+.Dv SEEK_CUR ,
+the offset is set to its current location plus
+.Fa offset
+bytes.
+.It
+If
+.Fa whence
+is
+.Dv SEEK_END ,
+the offset is set to the size of the
+file plus
+.Fa offset
+bytes.
+.It
+If
+.Fa whence
+is
+.Dv SEEK_HOLE ,
+the offset of the start of the next hole greater than or equal to the supplied
+.Fa offset
+is returned.
+The definition of a hole is provided below.
+.It
+If
+.Fa whence
+is
+.Dv SEEK_DATA ,
+the offset is set to the start of the next non-hole file region greater
+than or equal to the supplied
+.Fa offset .
+.El
+.Pp
+The
+.Fn lseek
+system call allows the file offset to be set beyond the end
+of the existing end-of-file of the file.
+If data is later written
+at this point, subsequent reads of the data in the gap return
+bytes of zeros (until data is actually written into the gap).
+.Pp
+Some devices are incapable of seeking.
+The value of the pointer
+associated with such a device is undefined.
+.Pp
+A
+.Qq hole
+is defined as a contiguous range of bytes in a file, all having the value of
+zero, but not all zeros in a file are guaranteed to be represented as holes
+returned with
+.Dv SEEK_HOLE .
+File systems are allowed to expose ranges of zeros with
+.Dv SEEK_HOLE ,
+but not required to.
+Applications can use
+.Dv SEEK_HOLE
+to optimise their behavior for ranges of zeros, but must not depend on it to
+find all such ranges in a file.
+The existence of a hole at the end of every data region allows for easy
+programming and implies that a virtual hole exists at the end of the file.
+Applications should use
+.Fn fpathconf _PC_MIN_HOLE_SIZE
+or
+.Fn pathconf _PC_MIN_HOLE_SIZE
+to determine if a file system supports
+.Dv SEEK_HOLE .
+See
+.Xr pathconf 2 .
+.Pp
+For file systems that do not supply information about holes, the file will be
+represented as one entire data region.
+.Sh RETURN VALUES
+Upon successful completion,
+.Fn lseek
+returns the resulting offset location as measured in bytes from the
+beginning of the file.
+Otherwise,
+a value of -1 is returned and
+.Va errno
+is set to indicate
+the error.
+.Sh ERRORS
+The
+.Fn lseek
+system call
+will fail and the file position pointer will remain unchanged if:
+.Bl -tag -width Er
+.It Bq Er EBADF
+The
+.Fa fildes
+argument
+is not an open file descriptor.
+.It Bq Er EINVAL
+The
+.Fa whence
+argument
+is not a proper value
+or the resulting file offset would
+be negative for a non-character special file.
+.It Bq Er ENXIO
+For
+.Dv SEEK_DATA ,
+there are no more data regions past the supplied offset.
+For
+.Dv SEEK_HOLE ,
+there are no more holes past the supplied offset.
+.It Bq Er EOVERFLOW
+The resulting file offset would be a value which cannot be represented
+correctly in an object of type
+.Fa off_t .
+.It Bq Er ESPIPE
+The
+.Fa fildes
+argument
+is associated with a pipe, socket, or FIFO.
+.El
+.Sh SEE ALSO
+.Xr dup 2 ,
+.Xr open 2 ,
+.Xr pathconf 2
+.Sh STANDARDS
+The
+.Fn lseek
+system call is expected to conform to
+.St -p1003.1-90 .
+.Sh HISTORY
+The
+.Fn lseek
+function appeared in
+.At v7 .
+.Sh BUGS
+This document's use of
+.Fa whence
+is incorrect English, but is maintained for historical reasons.
diff --git a/lib/libc/sys/lseek.c b/lib/libc/sys/lseek.c
new file mode 100644
index 0000000..a086be1
--- /dev/null
+++ b/lib/libc/sys/lseek.c
@@ -0,0 +1,56 @@
+/*
+ * Copyright (c) 1992, 1993
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#if defined(LIBC_SCCS) && !defined(lint)
+static char sccsid[] = "@(#)lseek.c	8.1 (Berkeley) 6/17/93";
+#endif /* LIBC_SCCS and not lint */
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/types.h>
+#include <sys/syscall.h>
+#include <unistd.h>
+#include "libc_private.h"
+
+/*
+ * This function provides 64-bit offset padding that
+ * is not supplied by GCC 1.X but is supplied by GCC 2.X.
+ */
+off_t
+lseek(fd, offset, whence)
+	int	fd;
+	off_t	offset;
+	int	whence;
+{
+
+	if (__getosreldate() >= 700051)
+		return(__sys_lseek(fd, offset, whence));
+	else
+		return(__sys_freebsd6_lseek(fd, 0, offset, whence));
+}
diff --git a/lib/libc/sys/madvise.2 b/lib/libc/sys/madvise.2
new file mode 100644
index 0000000..48f0e5a
--- /dev/null
+++ b/lib/libc/sys/madvise.2
@@ -0,0 +1,182 @@
+.\" Copyright (c) 1991, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"	@(#)madvise.2	8.1 (Berkeley) 6/9/93
+.\" $FreeBSD$
+.\"
+.Dd July 19, 1996
+.Dt MADVISE 2
+.Os
+.Sh NAME
+.Nm madvise , posix_madvise
+.Nd give advice about use of memory
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In sys/mman.h
+.Ft int
+.Fn madvise "void *addr" "size_t len" "int behav"
+.Ft int
+.Fn posix_madvise "void *addr" "size_t len" "int behav"
+.Sh DESCRIPTION
+The
+.Fn madvise
+system call
+allows a process that has knowledge of its memory behavior
+to describe it to the system.
+The
+.Fn posix_madvise
+interface is identical and is provided for standards conformance.
+.Pp
+The known behaviors are:
+.Bl -tag -width MADV_SEQUENTIAL
+.It Dv MADV_NORMAL
+Tells the system to revert to the default paging
+behavior.
+.It Dv MADV_RANDOM
+Is a hint that pages will be accessed randomly, and prefetching
+is likely not advantageous.
+.It Dv MADV_SEQUENTIAL
+Causes the VM system to depress the priority of
+pages immediately preceding a given page when it is faulted in.
+.It Dv MADV_WILLNEED
+Causes pages that are in a given virtual address range
+to temporarily have higher priority, and if they are in
+memory, decrease the likelihood of them being freed.
+Additionally,
+the pages that are already in memory will be immediately mapped into
+the process, thereby eliminating unnecessary overhead of going through
+the entire process of faulting the pages in.
+This WILL NOT fault
+pages in from backing store, but quickly map the pages already in memory
+into the calling process.
+.It Dv MADV_DONTNEED
+Allows the VM system to decrease the in-memory priority
+of pages in the specified range.
+Additionally future references to
+this address range will incur a page fault.
+.It Dv MADV_FREE
+Gives the VM system the freedom to free pages,
+and tells the system that information in the specified page range
+is no longer important.
+This is an efficient way of allowing
+.Xr malloc 3
+to free pages anywhere in the address space, while keeping the address space
+valid.
+The next time that the page is referenced, the page might be demand
+zeroed, or might contain the data that was there before the
+.Dv MADV_FREE
+call.
+References made to that address space range will not make the VM system
+page the information back in from backing store until the page is
+modified again.
+.It Dv MADV_NOSYNC
+Request that the system not flush the data associated with this map to
+physical backing store unless it needs to.
+Typically this prevents the
+file system update daemon from gratuitously writing pages dirtied
+by the VM system to physical disk.
+Note that VM/file system coherency is
+always maintained, this feature simply ensures that the mapped data is
+only flush when it needs to be, usually by the system pager.
+.Pp
+This feature is typically used when you want to use a file-backed shared
+memory area to communicate between processes (IPC) and do not particularly
+need the data being stored in that area to be physically written to disk.
+With this feature you get the equivalent performance with mmap that you
+would expect to get with SysV shared memory calls, but in a more controllable
+and less restrictive manner.
+However, note that this feature is not portable
+across UNIX platforms (though some may do the right thing by default).
+For more information see the MAP_NOSYNC section of
+.Xr mmap 2
+.It Dv MADV_AUTOSYNC
+Undoes the effects of MADV_NOSYNC for any future pages dirtied within the
+address range.
+The effect on pages already dirtied is indeterminate - they
+may or may not be reverted.
+You can guarantee reversion by using the
+.Xr msync 2
+or
+.Xr fsync 2
+system calls.
+.It Dv MADV_NOCORE
+Region is not included in a core file.
+.It Dv MADV_CORE
+Include region in a core file.
+.It Dv MADV_PROTECT
+Informs the VM system this process should not be killed when the
+swap space is exhausted.
+The process must have superuser privileges.
+This should be used judiciously in processes that must remain running
+for the system to properly function.
+.El
+.Pp
+Portable programs that call the
+.Fn posix_madvise
+interface should use the aliases
+.Dv POSIX_MADV_NORMAL , POSIX_MADV_SEQUENTIAL ,
+.Dv POSIX_MADV_RANDOM , POSIX_MADV_WILLNEED ,
+and
+.Dv POSIX_MADV_DONTNEED
+rather than the flags described above.
+.Sh RETURN VALUES
+.Rv -std madvise
+.Sh ERRORS
+The
+.Fn madvise
+system call will fail if:
+.Bl -tag -width Er
+.It Bq Er EINVAL
+The
+.Fa behav
+argument is not valid.
+.It Bq Er ENOMEM
+The virtual address range specified by the
+.Fa addr
+and
+.Fa len
+arguments is not valid.
+.It Bq Er EPERM
+.Dv MADV_PROTECT
+was specified and the process does not have superuser privileges.
+.El
+.Sh SEE ALSO
+.Xr mincore 2 ,
+.Xr mprotect 2 ,
+.Xr msync 2 ,
+.Xr munmap 2
+.Sh STANDARDS
+The
+.Fn posix_madvise
+interface conforms to
+.St -p1003.1-2001 .
+.Sh HISTORY
+The
+.Fn madvise
+system call first appeared in
+.Bx 4.4 .
diff --git a/lib/libc/sys/mincore.2 b/lib/libc/sys/mincore.2
new file mode 100644
index 0000000..6c0fc67
--- /dev/null
+++ b/lib/libc/sys/mincore.2
@@ -0,0 +1,115 @@
+.\" Copyright (c) 1991, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"	@(#)mincore.2	8.1 (Berkeley) 6/9/93
+.\" $FreeBSD$
+.\"
+.Dd January 17, 2003
+.Dt MINCORE 2
+.Os
+.Sh NAME
+.Nm mincore
+.Nd determine residency of memory pages
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In sys/mman.h
+.Ft int
+.Fn mincore "const void *addr" "size_t len" "char *vec"
+.Sh DESCRIPTION
+The
+.Fn mincore
+system call determines whether each of the pages in the region beginning at
+.Fa addr
+and continuing for
+.Fa len
+bytes is resident.
+.\"The beginning address,
+.\".Fa addr ,
+.\"is first rounded down to a multiple of the page size (see
+.\".Xr getpagesize 3 ) .
+.\"The end address,
+.\".Fa addr No + Fa len ,
+.\"is rounded up to a multiple of the page size.
+The status is returned in the
+.Fa vec
+array, one character per page.
+Each character is either 0 if the page is not resident, or a combination of
+the following flags (defined in
+.In sys/mman.h ) :
+.Bl -tag -width ".Dv MINCORE_REFERENCED_OTHER"
+.It Dv MINCORE_INCORE
+Page is in core (resident).
+.It Dv MINCORE_REFERENCED
+Page has been referenced by us.
+.It Dv MINCORE_MODIFIED
+Page has been modified by us.
+.It Dv MINCORE_REFERENCED_OTHER
+Page has been referenced.
+.It Dv MINCORE_MODIFIED_OTHER
+Page has been modified.
+.It Dv MINCORE_SUPER
+Page is part of a "super" page. (only i386 & amd64)
+.El
+.Pp
+The information returned by
+.Fn mincore
+may be out of date by the time the system call returns.
+The only way to ensure that a page is resident is to lock it into memory
+with the
+.Xr mlock 2
+system call.
+.Sh RETURN VALUES
+.Rv -std mincore
+.Sh ERRORS
+The
+.Fn mincore
+system call will fail if:
+.Bl -tag -width Er
+.It Bq Er ENOMEM
+The virtual address range specified by the
+.Fa addr
+and
+.Fa len
+arguments is not fully mapped.
+.It Bq Er EFAULT
+The
+.Fa vec
+argument points to an illegal address.
+.El
+.Sh SEE ALSO
+.Xr madvise 2 ,
+.Xr mlock 2 ,
+.Xr mprotect 2 ,
+.Xr msync 2 ,
+.Xr munmap 2 ,
+.Xr getpagesize 3
+.Sh HISTORY
+The
+.Fn mincore
+system call first appeared in
+.Bx 4.4 .
diff --git a/lib/libc/sys/minherit.2 b/lib/libc/sys/minherit.2
new file mode 100644
index 0000000..dc85d09
--- /dev/null
+++ b/lib/libc/sys/minherit.2
@@ -0,0 +1,139 @@
+.\" $FreeBSD$
+.\"
+.\" Copyright (c) 1991, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"	@(#)minherit.2	8.1 (Berkeley) 6/9/93
+.\"
+.Dd October 30, 2007
+.Dt MINHERIT 2
+.Os
+.Sh NAME
+.Nm minherit
+.Nd control the inheritance of pages
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In sys/mman.h
+.Ft int
+.Fn minherit "void *addr" "size_t len" "int inherit"
+.Sh DESCRIPTION
+The
+.Fn minherit
+system call
+changes the specified pages to have the inheritance characteristic
+.Fa inherit .
+Not all implementations will guarantee that the inheritance characteristic
+can be set on a page basis;
+the granularity of changes may be as large as an entire region.
+.Fx
+is capable of adjusting inheritance characteristics on a page basis.
+Inheritance only effects children created by
+.Fn fork .
+It has no effect on
+.Fn exec .
+exec'd processes replace their address space entirely.
+This system call also
+has no effect on the parent's address space (other than to potentially
+share the address space with its children).
+.Pp
+Inheritance is a rather esoteric feature largely superseded by the
+.Dv MAP_SHARED
+feature of
+.Fn mmap .
+However, it is possible to use
+.Fn minherit
+to share a block of memory between parent and child that has been mapped
+.Dv MAP_PRIVATE .
+That is, modifications made by parent or child are shared but
+the original underlying file is left untouched.
+.Bl -tag -width ".Dv INHERIT_SHARE"
+.It Dv INHERIT_SHARE
+This option causes the address space in question to be shared between
+parent and child.
+It has no effect on how the original underlying backing
+store was mapped.
+.It Dv INHERIT_NONE
+This option prevents the address space in question from being inherited
+at all.
+The address space will be unmapped in the child.
+.It Dv INHERIT_COPY
+This option causes the child to inherit the address space as copy-on-write.
+This option also has an unfortunate side effect of causing the parent
+address space to become copy-on-write when the parent forks.
+If the original mapping was
+.Dv MAP_SHARED ,
+it will no longer be shared in the parent
+after the parent forks and there is no way to get the previous
+shared-backing-store mapping without unmapping and remapping the address
+space in the parent.
+.El
+.Sh RETURN VALUES
+.Rv -std minherit
+.Sh ERRORS
+The
+.Fn minherit
+system call will fail if:
+.Bl -tag -width Er
+.It Bq Er EINVAL
+The virtual address range specified by the
+.Fa addr
+and
+.Fa len
+arguments is not valid.
+.It Bq Er EACCES
+The flags specified by the
+.Fa inherit
+argument were not valid for the pages specified
+by the
+.Fa addr
+and
+.Fa len
+arguments.
+.El
+.Sh SEE ALSO
+.Xr fork 2 ,
+.Xr madvise 2 ,
+.Xr mincore 2 ,
+.Xr mprotect 2 ,
+.Xr msync 2 ,
+.Xr munmap 2 ,
+.Xr rfork 2
+.Sh HISTORY
+The
+.Fn minherit
+system call first appeared in
+.Ox
+and then in
+.Fx 2.2 .
+.Sh BUGS
+Once you set inheritance to
+.Dv MAP_PRIVATE
+or
+.Dv MAP_SHARED ,
+there is no way to recover the original copy-on-write semantics
+short of unmapping and remapping the area.
diff --git a/lib/libc/sys/mkdir.2 b/lib/libc/sys/mkdir.2
new file mode 100644
index 0000000..1edb408
--- /dev/null
+++ b/lib/libc/sys/mkdir.2
@@ -0,0 +1,176 @@
+.\" Copyright (c) 1983, 1991, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"     @(#)mkdir.2	8.2 (Berkeley) 12/11/93
+.\" $FreeBSD$
+.\"
+.Dd June 26, 2008
+.Dt MKDIR 2
+.Os
+.Sh NAME
+.Nm mkdir ,
+.Nm mkdirat
+.Nd make a directory file
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In sys/stat.h
+.Ft int
+.Fn mkdir "const char *path" "mode_t mode"
+.Ft int
+.Fn mkdirat "int fd" "const char *path" "mode_t mode"
+.Sh DESCRIPTION
+The directory
+.Fa path
+is created with the access permissions specified by
+.Fa mode
+and restricted by the
+.Xr umask 2
+of the calling process.
+.Pp
+The directory's owner ID is set to the process's effective user ID.
+The directory's group ID is set to that of the parent directory in
+which it is created.
+.Pp
+The
+.Fn mkdirat
+system call is equivalent to
+.Fn mkdir
+except in the case where
+.Fa path
+specifies a relative path.
+In this case the newly created directory is created relative to the
+directory associated with the file descriptor
+.Fa fd
+instead of the current working directory.
+If
+.Fn mkdirat
+is passed the special value
+.Dv AT_FDCWD
+in the
+.Fa fd
+parameter, the current working directory is used and the behavior is
+identical to a call to
+.Fn mkdir .
+.Sh RETURN VALUES
+.Rv -std mkdir
+.Sh ERRORS
+The
+.Fn mkdir
+system call
+will fail and no directory will be created if:
+.Bl -tag -width Er
+.It Bq Er ENOTDIR
+A component of the path prefix is not a directory.
+.It Bq Er ENAMETOOLONG
+A component of a pathname exceeded 255 characters,
+or an entire path name exceeded 1023 characters.
+.It Bq Er ENOENT
+A component of the path prefix does not exist.
+.It Bq Er EACCES
+Search permission is denied for a component of the path prefix,
+or write permission is denied
+on the parent directory of the directory to be created.
+.It Bq Er ELOOP
+Too many symbolic links were encountered in translating the pathname.
+.It Bq Er EPERM
+The parent directory of the directory to be created has its immutable flag set,
+see the
+.Xr chflags 2
+manual page for more information.
+.It Bq Er EROFS
+The named directory would reside on a read-only file system.
+.It Bq Er EMLINK
+The new directory cannot be created because the parent directory contains
+too many subdirectories.
+.It Bq Er EEXIST
+The named file exists.
+.It Bq Er ENOSPC
+The new directory cannot be created because there is no space left
+on the file system that will contain the directory.
+.It Bq Er ENOSPC
+There are no free inodes on the file system on which the
+directory is being created.
+.It Bq Er EDQUOT
+The new directory cannot be created because the user's
+quota of disk blocks on the file system that will
+contain the directory has been exhausted.
+.It Bq Er EDQUOT
+The user's quota of inodes on the file system on
+which the directory is being created has been exhausted.
+.It Bq Er EIO
+An I/O error occurred while making the directory entry or allocating the inode.
+.It Bq Er EIO
+An I/O error occurred while reading from or writing to the file system.
+.It Bq Er EFAULT
+The
+.Fa path
+argument
+points outside the process's allocated address space.
+.El
+.Pp
+In addition to the errors returned by the
+.Fn mkdir ,
+the
+.Fn mkdirat
+may fail if:
+.Bl -tag -width Er
+.It Bq Er EBADF
+The
+.Fa path
+argument does not specify an absolute path and the
+.Fa fd
+argument is neither
+.Dv AT_FDCWD
+nor a valid file descriptor open for searching.
+.It Bq Er ENOTDIR
+The
+.Fa path
+argument is not an absolute path and
+.Fa fd
+is neither
+.Dv AT_FDCWD
+nor a file descriptor associated with a directory.
+.El
+.Sh SEE ALSO
+.Xr chflags 2 ,
+.Xr chmod 2 ,
+.Xr stat 2 ,
+.Xr umask 2
+.Sh STANDARDS
+The
+.Fn mkdir
+system call is expected to conform to
+.St -p1003.1-90 .
+The
+.Fn mkdirat
+system call follows The Open Group Extended API Set 2 specification.
+.Sh HISTORY
+The
+.Fn mkdirat
+system call appeared in
+.Fx 8.0 .
diff --git a/lib/libc/sys/mkfifo.2 b/lib/libc/sys/mkfifo.2
new file mode 100644
index 0000000..9b4ac5d
--- /dev/null
+++ b/lib/libc/sys/mkfifo.2
@@ -0,0 +1,185 @@
+.\" Copyright (c) 1990, 1991, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"	@(#)mkfifo.2	8.1 (Berkeley) 6/4/93
+.\" $FreeBSD$
+.\"
+.Dd April 10, 2008
+.Dt MKFIFO 2
+.Os
+.Sh NAME
+.Nm mkfifo ,
+.Nm mkfifoat
+.Nd make a fifo file
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In sys/types.h
+.In sys/stat.h
+.Ft int
+.Fn mkfifo "const char *path" "mode_t mode"
+.Ft int
+.Fn mkfifoat "int fd" "const char *path" "mode_t mode"
+.Sh DESCRIPTION
+The
+.Fn mkfifo
+system call
+creates a new fifo file with name
+.Fa path .
+The access permissions are
+specified by
+.Fa mode
+and restricted by the
+.Xr umask 2
+of the calling process.
+.Pp
+The fifo's owner ID is set to the process's effective user ID.
+The fifo's group ID is set to that of the parent directory in
+which it is created.
+.Pp
+The
+.Fn mkfifoat
+system call is equivalent to
+.Fn mkfifo
+except in the case where
+.Fa path
+specifies a relative path.
+In this case the newly created FIFO is created relative to the
+directory associated with the file descriptor
+.Fa fd
+instead of the current working directory.
+If
+.Fn mkfifoat
+is passed the special value
+.Dv AT_FDCWD
+in the
+.Fa fd
+parameter, the current working directory is used and the behavior is
+identical to a call to
+.Fn mkfifo .
+.Sh RETURN VALUES
+.Rv -std mkfifo
+.Sh ERRORS
+The
+.Fn mkfifo
+system call
+will fail and no fifo will be created if:
+.Bl -tag -width Er
+.It Bq Er ENOTSUP
+The kernel has not been configured to support fifo's.
+.It Bq Er ENOTDIR
+A component of the path prefix is not a directory.
+.It Bq Er ENAMETOOLONG
+A component of a pathname exceeded 255 characters,
+or an entire path name exceeded 1023 characters.
+.It Bq Er ENOENT
+A component of the path prefix does not exist.
+.It Bq Er EACCES
+A component of the path prefix denies search permission, or write permission
+is denied on the parent directory of the fifo to be created.
+.It Bq Er ELOOP
+Too many symbolic links were encountered in translating the pathname.
+.It Bq Er EROFS
+The named file would reside on a read-only file system.
+.It Bq Er EEXIST
+The named file exists.
+.It Bq Er EPERM
+The parent directory of the named file has its immutable flag set, see the
+.Xr chflags 2
+manual page for more information.
+.It Bq Er ENOSPC
+The directory in which the entry for the new fifo is being placed
+cannot be extended because there is no space left on the file
+system containing the directory.
+.It Bq Er ENOSPC
+There are no free inodes on the file system on which the
+fifo is being created.
+.It Bq Er EDQUOT
+The directory in which the entry for the new fifo
+is being placed cannot be extended because the
+user's quota of disk blocks on the file system
+containing the directory has been exhausted.
+.It Bq Er EDQUOT
+The user's quota of inodes on the file system on
+which the fifo is being created has been exhausted.
+.It Bq Er EIO
+An
+.Tn I/O
+error occurred while making the directory entry or allocating the inode.
+.It Bq Er EIO
+An
+.Tn I/O
+error occurred while reading from or writing to the file system.
+.It Bq Er EFAULT
+The
+.Fa path
+argument
+points outside the process's allocated address space.
+.El
+.Pp
+In addition to the errors returned by the
+.Fn mkfifo ,
+the
+.Fn mkfifoat
+may fail if:
+.Bl -tag -width Er
+.It Bq Er EBADF
+The
+.Fa path
+argument does not specify an absolute path and the
+.Fa fd
+argument is neither
+.Dv AT_FDCWD
+nor a valid file descriptor open for searching.
+.It Bq Er ENOTDIR
+The
+.Fa path
+argument is not an absolute path and
+.Fa fd
+is neither
+.Dv AT_FDCWD
+nor a file descriptor associated with a directory.
+.El
+.Sh SEE ALSO
+.Xr chflags 2 ,
+.Xr chmod 2 ,
+.Xr mknod 2 ,
+.Xr stat 2 ,
+.Xr umask 2
+.Sh STANDARDS
+The
+.Fn mkfifo
+system call is expected to conform to
+.St -p1003.1-90 .
+The
+.Fn mkfifoat
+system call follows The Open Group Extended API Set 2 specification.
+.Sh HISTORY
+The
+.Fn mkfifoat
+system call appeared in
+.Fx 8.0 .
diff --git a/lib/libc/sys/mknod.2 b/lib/libc/sys/mknod.2
new file mode 100644
index 0000000..0fc8771
--- /dev/null
+++ b/lib/libc/sys/mknod.2
@@ -0,0 +1,182 @@
+.\" Copyright (c) 1980, 1991, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"     @(#)mknod.2	8.1 (Berkeley) 6/4/93
+.\" $FreeBSD$
+.\"
+.Dd April 10, 2008
+.Dt MKNOD 2
+.Os
+.Sh NAME
+.Nm mknod ,
+.Nm mknodat
+.Nd make a special file node
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In unistd.h
+.Ft int
+.Fn mknod "const char *path" "mode_t mode" "dev_t dev"
+.Ft int
+.Fn mknodat "int fd" "const char *path" "mode_t mode" "dev_t dev"
+.Sh DESCRIPTION
+The file system node
+.Fa path
+is created with the file type and access permissions specified in
+.Fa mode .
+The access permissions are modified by the process's umask value.
+.Pp
+If
+.Fa mode
+indicates a block or character special file,
+.Fa dev
+is a configuration dependent specification denoting a particular device
+on the system.
+Otherwise,
+.Fa dev
+is ignored.
+.Pp
+The
+.Fn mknod
+system call
+requires super-user privileges.
+.Pp
+The
+.Fn mknodat
+system call is equivalent to
+.Fn mknod
+except in the case where
+.Fa path
+specifies a relative path.
+In this case the newly created device node is created relative to the
+directory associated with the file descriptor
+.Fa fd
+instead of the current working directory.
+If
+.Fn mknodat
+is passed the special value
+.Dv AT_FDCWD
+in the
+.Fa fd
+parameter, the current working directory is used and the behavior is
+identical to a call to
+.Fn mknod .
+.Sh RETURN VALUES
+.Rv -std mknod
+.Sh ERRORS
+The
+.Fn mknod
+system call
+will fail and the file will be not created if:
+.Bl -tag -width Er
+.It Bq Er ENOTDIR
+A component of the path prefix is not a directory.
+.It Bq Er ENAMETOOLONG
+A component of a pathname exceeded 255 characters,
+or an entire path name exceeded 1023 characters.
+.It Bq Er ENOENT
+A component of the path prefix does not exist.
+.It Bq Er EACCES
+Search permission is denied for a component of the path prefix.
+.It Bq Er ELOOP
+Too many symbolic links were encountered in translating the pathname.
+.It Bq Er EPERM
+The process's effective user ID is not super-user.
+.It Bq Er EIO
+An I/O error occurred while making the directory entry or allocating the inode.
+.It Bq Er ENOSPC
+The directory in which the entry for the new node is being placed
+cannot be extended because there is no space left on the file
+system containing the directory.
+.It Bq Er ENOSPC
+There are no free inodes on the file system on which the
+node is being created.
+.It Bq Er EDQUOT
+The directory in which the entry for the new node
+is being placed cannot be extended because the
+user's quota of disk blocks on the file system
+containing the directory has been exhausted.
+.It Bq Er EDQUOT
+The user's quota of inodes on the file system on
+which the node is being created has been exhausted.
+.It Bq Er EROFS
+The named file resides on a read-only file system.
+.It Bq Er EEXIST
+The named file exists.
+.It Bq Er EFAULT
+The
+.Fa path
+argument
+points outside the process's allocated address space.
+.It Bq Er EINVAL
+Creating anything else than a block or character special
+file (or a
+.Em whiteout )
+is not supported.
+.El
+.Pp
+In addition to the errors returned by the
+.Fn mknod ,
+the
+.Fn mknodat
+may fail if:
+.Bl -tag -width Er
+.It Bq Er EBADF
+The
+.Fa path
+argument does not specify an absolute path and the
+.Fa fd
+argument is neither
+.Dv AT_FDCWD
+nor a valid file descriptor open for searching.
+.It Bq Er ENOTDIR
+The
+.Fa path
+argument is not an absolute path and
+.Fa fd
+is neither
+.Dv AT_FDCWD
+nor a file descriptor associated with a directory.
+.El
+.Sh SEE ALSO
+.Xr chmod 2 ,
+.Xr mkfifo 2 ,
+.Xr stat 2 ,
+.Xr umask 2
+.Sh STANDARDS
+The
+.Fn mknodat
+system call follows The Open Group Extended API Set 2 specification.
+.Sh HISTORY
+The
+.Fn mknod
+function appeared in
+.At v6 .
+The
+.Fn mknodat
+system call appeared in
+.Fx 8.0 .
diff --git a/lib/libc/sys/mlock.2 b/lib/libc/sys/mlock.2
new file mode 100644
index 0000000..ed9c15a
--- /dev/null
+++ b/lib/libc/sys/mlock.2
@@ -0,0 +1,166 @@
+.\" Copyright (c) 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"	@(#)mlock.2	8.2 (Berkeley) 12/11/93
+.\" $FreeBSD$
+.\"
+.Dd July 27, 2010
+.Dt MLOCK 2
+.Os
+.Sh NAME
+.Nm mlock ,
+.Nm munlock
+.Nd lock (unlock) physical pages in memory
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In sys/mman.h
+.Ft int
+.Fn mlock "const void *addr" "size_t len"
+.Ft int
+.Fn munlock "const void *addr" "size_t len"
+.Sh DESCRIPTION
+The
+.Fn mlock
+system call
+locks into memory the physical pages associated with the virtual address
+range starting at
+.Fa addr
+for
+.Fa len
+bytes.
+The
+.Fn munlock
+system call unlocks pages previously locked by one or more
+.Fn mlock
+calls.
+For both, the
+.Fa addr
+argument should be aligned to a multiple of the page size.
+If the
+.Fa len
+argument is not a multiple of the page size, it will be rounded up
+to be so.
+The entire range must be allocated.
+.Pp
+After an
+.Fn mlock
+system call, the indicated pages will cause neither a non-resident page
+nor address-translation fault until they are unlocked.
+They may still cause protection-violation faults or TLB-miss faults on
+architectures with software-managed TLBs.
+The physical pages remain in memory until all locked mappings for the pages
+are removed.
+Multiple processes may have the same physical pages locked via their own
+virtual address mappings.
+A single process may likewise have pages multiply-locked via different virtual
+mappings of the same pages or via nested
+.Fn mlock
+calls on the same address range.
+Unlocking is performed explicitly by
+.Fn munlock
+or implicitly by a call to
+.Fn munmap
+which deallocates the unmapped address range.
+Locked mappings are not inherited by the child process after a
+.Xr fork 2 .
+.Pp
+Since physical memory is a potentially scarce resource, processes are
+limited in how much they can lock down.
+A single process can
+.Fn mlock
+the minimum of
+a system-wide ``wired pages'' limit and
+the per-process
+.Li RLIMIT_MEMLOCK
+resource limit.
+.Pp
+These calls are only available to the super-user.
+.Sh RETURN VALUES
+.Rv -std
+.Pp
+If the call succeeds, all pages in the range become locked (unlocked);
+otherwise the locked status of all pages in the range remains unchanged.
+.Sh ERRORS
+The
+.Fn mlock
+system call
+will fail if:
+.Bl -tag -width Er
+.It Bq Er EPERM
+The caller is not the super-user.
+.It Bq Er EINVAL
+The address given is not page aligned or the length is negative.
+.It Bq Er EAGAIN
+Locking the indicated range would exceed the system limit for locked memory.
+.It Bq Er ENOMEM
+Some portion of the indicated address range is not allocated.
+There was an error faulting/mapping a page.
+Locking the indicated range would exceed the per-process limit for locked
+memory.
+.El
+The
+.Fn munlock
+system call
+will fail if:
+.Bl -tag -width Er
+.It Bq Er EPERM
+The caller is not the super-user.
+.It Bq Er EINVAL
+The address given is not page aligned or the length is negative.
+.It Bq Er ENOMEM
+Some portion of the indicated address range is not allocated.
+.El
+.Sh "SEE ALSO"
+.Xr fork 2 ,
+.Xr mincore 2 ,
+.Xr minherit 2 ,
+.Xr mlockall 2 ,
+.Xr mmap 2 ,
+.Xr munlockall 2 ,
+.Xr munmap 2 ,
+.Xr setrlimit 2 ,
+.Xr getpagesize 3
+.Sh HISTORY
+The
+.Fn mlock
+and
+.Fn munlock
+system calls first appeared in
+.Bx 4.4 .
+.Sh BUGS
+Allocating too much wired memory can lead to a memory-allocation deadlock
+which requires a reboot to recover from.
+.Pp
+The per-process resource limit is a limit on the amount of virtual
+memory locked, while the system-wide limit is for the number of locked
+physical pages.
+Hence a process with two distinct locked mappings of the same physical page
+counts as 2 pages against the per-process limit and as only a single page
+in the system limit.
+.Pp
+The per-process resource limit is not currently supported.
diff --git a/lib/libc/sys/mlockall.2 b/lib/libc/sys/mlockall.2
new file mode 100644
index 0000000..54ae23e
--- /dev/null
+++ b/lib/libc/sys/mlockall.2
@@ -0,0 +1,135 @@
+.\"	$NetBSD: mlockall.2,v 1.11 2003/04/16 13:34:54 wiz Exp $
+.\"
+.\" Copyright (c) 1999 The NetBSD Foundation, Inc.
+.\" All rights reserved.
+.\"
+.\" This code is derived from software contributed to The NetBSD Foundation
+.\" by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
+.\" NASA Ames Research Center.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
+.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+.\" PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
+.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+.\" POSSIBILITY OF SUCH DAMAGE.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd July 27, 2010
+.Dt MLOCKALL 2
+.Os
+.Sh NAME
+.Nm mlockall ,
+.Nm munlockall
+.Nd lock (unlock) the address space of a process
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In sys/mman.h
+.Ft int
+.Fn mlockall "int flags"
+.Ft int
+.Fn munlockall "void"
+.Sh DESCRIPTION
+The
+.Fn mlockall
+system call locks into memory the physical pages associated with the
+address space of a process until the address space is unlocked, the
+process exits, or execs another program image.
+.Pp
+The following flags affect the behavior of
+.Fn mlockall :
+.Bl -tag -width ".Dv MCL_CURRENT"
+.It Dv MCL_CURRENT
+Lock all pages currently mapped into the process's address space.
+.It Dv MCL_FUTURE
+Lock all pages mapped into the process's address space in the future,
+at the time the mapping is established.
+Note that this may cause future mappings to fail if those mappings
+cause resource limits to be exceeded.
+.El
+.Pp
+Since physical memory is a potentially scarce resource, processes are
+limited in how much they can lock down.
+A single process can lock the minimum of a system-wide
+.Dq wired pages
+limit and the per-process
+.Dv RLIMIT_MEMLOCK
+resource limit.
+.Pp
+These calls are only available to the super-user.
+.Pp
+The
+.Fn munlockall
+call unlocks any locked memory regions in the process address space.
+Any regions mapped after an
+.Fn munlockall
+call will not be locked.
+.Sh RETURN VALUES
+A return value of 0 indicates that the call
+succeeded and all pages in the range have either been locked or unlocked.
+A return value of \-1 indicates an error occurred and the locked
+status of all pages in the range remains unchanged.
+In this case, the global location
+.Va errno
+is set to indicate the error.
+.Sh ERRORS
+.Fn mlockall
+will fail if:
+.Bl -tag -width Er
+.It Bq Er EINVAL
+The
+.Fa flags
+argument is zero, or includes unimplemented flags.
+.It Bq Er ENOMEM
+Locking the indicated range would exceed either the system or per-process
+limit for locked memory.
+.It Bq Er EAGAIN
+Some or all of the memory mapped into the process's address space
+could not be locked when the call was made.
+.It Bq Er EPERM
+The calling process does not have the appropriate privilege to perform
+the requested operation.
+.El
+.Sh SEE ALSO
+.Xr mincore 2 ,
+.Xr mlock 2 ,
+.Xr mmap 2 ,
+.Xr munmap 2 ,
+.Xr setrlimit 2
+.Sh STANDARDS
+The
+.Fn mlockall
+and
+.Fn munlockall
+functions are believed to conform to
+.St -p1003.1-2001 .
+.Sh HISTORY
+The
+.Fn mlockall
+and
+.Fn munlockall
+functions first appeared in
+.Fx 5.1 .
+.Sh BUGS
+The per-process resource limit is a limit on the amount of virtual
+memory locked, while the system-wide limit is for the number of locked
+physical pages.
+Hence a process with two distinct locked mappings of the same physical page
+counts as 2 pages against the per-process limit and as only a single page
+in the system limit.
diff --git a/lib/libc/sys/mmap.2 b/lib/libc/sys/mmap.2
new file mode 100644
index 0000000..0b1f35f
--- /dev/null
+++ b/lib/libc/sys/mmap.2
@@ -0,0 +1,377 @@
+.\" Copyright (c) 1991, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"	@(#)mmap.2	8.4 (Berkeley) 5/11/95
+.\" $FreeBSD$
+.\"
+.Dd August 28, 2010
+.Dt MMAP 2
+.Os
+.Sh NAME
+.Nm mmap
+.Nd allocate memory, or map files or devices into memory
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In sys/mman.h
+.Ft void *
+.Fn mmap "void *addr" "size_t len" "int prot" "int flags" "int fd" "off_t offset"
+.Sh DESCRIPTION
+The
+.Fn mmap
+system call causes the pages starting at
+.Fa addr
+and continuing for at most
+.Fa len
+bytes to be mapped from the object described by
+.Fa fd ,
+starting at byte offset
+.Fa offset .
+If
+.Fa len
+is not a multiple of the pagesize, the mapped region may extend past the
+specified range.
+Any such extension beyond the end of the mapped object will be zero-filled.
+.Pp
+If
+.Fa addr
+is non-zero, it is used as a hint to the system.
+(As a convenience to the system, the actual address of the region may differ
+from the address supplied.)
+If
+.Fa addr
+is zero, an address will be selected by the system.
+The actual starting address of the region is returned.
+A successful
+.Fa mmap
+deletes any previous mapping in the allocated address range.
+.Pp
+The protections (region accessibility) are specified in the
+.Fa prot
+argument by
+.Em or Ns 'ing
+the following values:
+.Pp
+.Bl -tag -width PROT_WRITE -compact
+.It Dv PROT_NONE
+Pages may not be accessed.
+.It Dv PROT_READ
+Pages may be read.
+.It Dv PROT_WRITE
+Pages may be written.
+.It Dv PROT_EXEC
+Pages may be executed.
+.El
+.Pp
+The
+.Fa flags
+argument specifies the type of the mapped object, mapping options and
+whether modifications made to the mapped copy of the page are private
+to the process or are to be shared with other references.
+Sharing, mapping type and options are specified in the
+.Fa flags
+argument by
+.Em or Ns 'ing
+the following values:
+.Bl -tag -width MAP_HASSEMAPHORE
+.It Dv MAP_ANON
+Map anonymous memory not associated with any specific file.
+The file descriptor used for creating
+.Dv MAP_ANON
+must be \-1.
+The
+.Fa offset
+argument must be 0.
+.\".It Dv MAP_FILE
+.\"Mapped from a regular file or character-special device memory.
+.It Dv MAP_ANONYMOUS
+This flag is identical to
+.Dv MAP_ANON
+and is provided for compatibility.
+.It Dv MAP_FIXED
+Do not permit the system to select a different address than the one
+specified.
+If the specified address cannot be used,
+.Fn mmap
+will fail.
+If
+.Dv MAP_FIXED
+is specified,
+.Fa addr
+must be a multiple of the pagesize.
+If a
+.Dv MAP_FIXED
+request is successful, the mapping established by
+.Fn mmap
+replaces any previous mappings for the process' pages in the range from
+.Fa addr
+to
+.Fa addr
++
+.Fa len .
+Use of this option is discouraged.
+.It Dv MAP_HASSEMAPHORE
+Notify the kernel that the region may contain semaphores and that special
+handling may be necessary.
+.It Dv MAP_INHERIT
+This flag never operated as advertised and is no longer supported.
+Please refer to
+.Xr minherit 2
+for further information.
+.It Dv MAP_NOCORE
+Region is not included in a core file.
+.It Dv MAP_NOSYNC
+Causes data dirtied via this VM map to be flushed to physical media
+only when necessary (usually by the pager) rather than gratuitously.
+Typically this prevents the update daemons from flushing pages dirtied
+through such maps and thus allows efficient sharing of memory across
+unassociated processes using a file-backed shared memory map.
+Without
+this option any VM pages you dirty may be flushed to disk every so often
+(every 30-60 seconds usually) which can create performance problems if you
+do not need that to occur (such as when you are using shared file-backed
+mmap regions for IPC purposes).
+Note that VM/file system coherency is
+maintained whether you use
+.Dv MAP_NOSYNC
+or not.
+This option is not portable
+across
+.Ux
+platforms (yet), though some may implement the same behavior
+by default.
+.Pp
+.Em WARNING !
+Extending a file with
+.Xr ftruncate 2 ,
+thus creating a big hole, and then filling the hole by modifying a shared
+.Fn mmap
+can lead to severe file fragmentation.
+In order to avoid such fragmentation you should always pre-allocate the
+file's backing store by
+.Fn write Ns ing
+zero's into the newly extended area prior to modifying the area via your
+.Fn mmap .
+The fragmentation problem is especially sensitive to
+.Dv MAP_NOSYNC
+pages, because pages may be flushed to disk in a totally random order.
+.Pp
+The same applies when using
+.Dv MAP_NOSYNC
+to implement a file-based shared memory store.
+It is recommended that you create the backing store by
+.Fn write Ns ing
+zero's to the backing file rather than
+.Fn ftruncate Ns ing
+it.
+You can test file fragmentation by observing the KB/t (kilobytes per
+transfer) results from an
+.Dq Li iostat 1
+while reading a large file sequentially, e.g.\& using
+.Dq Li dd if=filename of=/dev/null bs=32k .
+.Pp
+The
+.Xr fsync 2
+system call will flush all dirty data and metadata associated with a file,
+including dirty NOSYNC VM data, to physical media.
+The
+.Xr sync 8
+command and
+.Xr sync 2
+system call generally do not flush dirty NOSYNC VM data.
+The
+.Xr msync 2
+system call is obsolete since
+.Bx
+implements a coherent file system buffer cache.
+However, it may be
+used to associate dirty VM pages with file system buffers and thus cause
+them to be flushed to physical media sooner rather than later.
+.It Dv MAP_PREFAULT_READ
+Immediately update the calling process's lowest-level virtual address
+translation structures, such as its page table, so that every memory
+resident page within the region is mapped for read access.
+Ordinarily these structures are updated lazily.
+The effect of this option is to eliminate any soft faults that would
+otherwise occur on the initial read accesses to the region.
+Although this option does not preclude
+.Fa prot
+from including
+.Dv PROT_WRITE ,
+it does not eliminate soft faults on the initial write accesses to the
+region.
+.It Dv MAP_PRIVATE
+Modifications are private.
+.It Dv MAP_SHARED
+Modifications are shared.
+.It Dv MAP_STACK
+.Dv MAP_STACK
+implies
+.Dv MAP_ANON ,
+and
+.Fa offset
+of 0.
+The
+.Fa fd
+argument
+must be -1 and
+.Fa prot
+must include at least
+.Dv PROT_READ
+and
+.Dv PROT_WRITE .
+This option creates
+a memory region that grows to at most
+.Fa len
+bytes in size, starting from the stack top and growing down.
+The
+stack top is the starting address returned by the call, plus
+.Fa len
+bytes.
+The bottom of the stack at maximum growth is the starting
+address returned by the call.
+.El
+.Pp
+The
+.Xr close 2
+system call does not unmap pages, see
+.Xr munmap 2
+for further information.
+.Pp
+The current design does not allow a process to specify the location of
+swap space.
+In the future we may define an additional mapping type,
+.Dv MAP_SWAP ,
+in which
+the file descriptor argument specifies a file or device to which swapping
+should be done.
+.Sh NOTES
+Although this implementation does not impose any alignment restrictions on
+the
+.Fa offset
+argument, a portable program must only use page-aligned values.
+.Sh RETURN VALUES
+Upon successful completion,
+.Fn mmap
+returns a pointer to the mapped region.
+Otherwise, a value of
+.Dv MAP_FAILED
+is returned and
+.Va errno
+is set to indicate the error.
+.Sh ERRORS
+The
+.Fn mmap
+system call
+will fail if:
+.Bl -tag -width Er
+.It Bq Er EACCES
+The flag
+.Dv PROT_READ
+was specified as part of the
+.Fa prot
+argument and
+.Fa fd
+was not open for reading.
+The flags
+.Dv MAP_SHARED
+and
+.Dv PROT_WRITE
+were specified as part of the
+.Fa flags
+and
+.Fa prot
+argument and
+.Fa fd
+was not open for writing.
+.It Bq Er EBADF
+The
+.Fa fd
+argument
+is not a valid open file descriptor.
+.It Bq Er EINVAL
+.Dv MAP_FIXED
+was specified and the
+.Fa addr
+argument was not page aligned, or part of the desired address space
+resides out of the valid address space for a user process.
+.It Bq Er EINVAL
+The
+.Fa len
+argument
+was equal to zero.
+.It Bq Er EINVAL
+.Dv MAP_ANON
+was specified and the
+.Fa fd
+argument was not -1.
+.It Bq Er EINVAL
+.Dv MAP_ANON
+was specified and the
+.Fa offset
+argument was not 0.
+.It Bq Er ENODEV
+.Dv MAP_ANON
+has not been specified and
+.Fa fd
+did not reference a regular or character special file.
+.It Bq Er ENOMEM
+.Dv MAP_FIXED
+was specified and the
+.Fa addr
+argument was not available.
+.Dv MAP_ANON
+was specified and insufficient memory was available.
+The system has reached the per-process mmap limit specified in the
+.Va vm.max_proc_mmap
+sysctl.
+.El
+.Sh SEE ALSO
+.Xr madvise 2 ,
+.Xr mincore 2 ,
+.Xr minherit 2 ,
+.Xr mlock 2 ,
+.Xr mprotect 2 ,
+.Xr msync 2 ,
+.Xr munlock 2 ,
+.Xr munmap 2 ,
+.Xr getpagesize 3 ,
+.Xr make.conf 5
+.Sh BUGS
+The
+.Fa len
+argument
+is limited to the maximum file size or available userland address
+space.
+Files may not be able to be made more than 1TB large on 32 bit systems
+due to file systems restrictions and bugs, but address space is far more
+restrictive.
+Larger files may be possible on 64 bit systems.
+.Pp
+The previous documented limit of 2GB was a documentation bug.
+That limit has not existed since
+.Fx 2.2 .
diff --git a/lib/libc/sys/mmap.c b/lib/libc/sys/mmap.c
new file mode 100644
index 0000000..cfdb944
--- /dev/null
+++ b/lib/libc/sys/mmap.c
@@ -0,0 +1,61 @@
+/*
+ * Copyright (c) 1992, 1993
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#if defined(LIBC_SCCS) && !defined(lint)
+static char sccsid[] = "@(#)mmap.c	8.1 (Berkeley) 6/17/93";
+#endif /* LIBC_SCCS and not lint */
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/types.h>
+#include <sys/mman.h>
+#include <sys/syscall.h>
+#include <unistd.h>
+#include "libc_private.h"
+
+/*
+ * This function provides 64-bit offset padding that
+ * is not supplied by GCC 1.X but is supplied by GCC 2.X.
+ */
+void *
+mmap(addr, len, prot, flags, fd, offset)
+	void *	addr;
+	size_t	len;
+	int	prot;
+	int	flags;
+	int	fd;
+	off_t	offset;
+{
+
+	if (__getosreldate() >= 700051)
+		return (__sys_mmap(addr, len, prot, flags, fd, offset));
+	else
+
+		return (__sys_freebsd6_mmap(addr, len, prot, flags, fd, 0, offset));
+}
diff --git a/lib/libc/sys/modfind.2 b/lib/libc/sys/modfind.2
new file mode 100644
index 0000000..3f48579
--- /dev/null
+++ b/lib/libc/sys/modfind.2
@@ -0,0 +1,86 @@
+.\"
+.\" Copyright (c) 1999 Chris Costello
+.\" All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd September 28, 2000
+.Dt MODFIND 2
+.Os
+.Sh NAME
+.Nm modfind
+.Nd returns the modid of a kernel module
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In sys/param.h
+.In sys/module.h
+.Ft int
+.Fn modfind "const char *modname"
+.Sh DESCRIPTION
+The
+.Fn modfind
+system call
+returns the modid of the kernel module referenced by
+.Fa modname .
+.Sh RETURN VALUES
+The
+.Fn modfind
+system call
+returns the modid of the kernel module referenced by
+.Fa file .
+Upon error,
+.Fn modfind
+returns -1 and sets
+.Va errno
+to indicate the error.
+.Sh ERRORS
+.Va errno
+is set to the following if
+.Fn modfind
+fails:
+.Bl -tag -width Er
+.It Bq Er EFAULT
+The data required for this operation could not be read from the kernel space.
+.It Bq Er ENOENT
+The file specified is not loaded in the kernel.
+.El
+.Sh SEE ALSO
+.Xr kldfind 2 ,
+.Xr kldfirstmod 2 ,
+.Xr kldload 2 ,
+.Xr kldnext 2 ,
+.Xr kldstat 2 ,
+.Xr kldsym 2 ,
+.Xr kldunload 2 ,
+.Xr modfnext 2 ,
+.Xr modnext 2 ,
+.Xr modstat 2 ,
+.Xr kld 4 ,
+.Xr kldstat 8
+.Sh HISTORY
+The
+.Nm kld
+interface first appeared in
+.Fx 3.0 .
diff --git a/lib/libc/sys/modnext.2 b/lib/libc/sys/modnext.2
new file mode 100644
index 0000000..c0c0a0d
--- /dev/null
+++ b/lib/libc/sys/modnext.2
@@ -0,0 +1,97 @@
+.\"
+.\" Copyright (c) 1999 Chris Costello
+.\" All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd September 28, 2000
+.Dt MODNEXT 2
+.Os
+.Sh NAME
+.Nm modnext
+.Nd return the modid of the next kernel module
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In sys/param.h
+.In sys/module.h
+.Ft int
+.Fn modnext "int modid"
+.Ft int
+.Fn modfnext "int modid"
+.Sh DESCRIPTION
+The
+.Fn modnext
+system call
+returns the modid of the next kernel module (that is, the one after
+.Va modid )
+or 0 if
+.Va modid
+is the last module in the list.
+.Pp
+If the
+.Va modid
+value is 0, then
+.Fn modnext
+will return the modid of the first module.
+The
+.Fn modfnext
+system call
+must always be given a valid modid.
+.Sh RETURN VALUES
+The
+.Fn modnext
+system call
+returns the modid of the next module (see
+.Sx DESCRIPTION )
+or 0.
+If an error
+occurs,
+.Va errno
+is set to indicate the error.
+.Sh ERRORS
+The only error set by
+.Fn modnext
+is
+.Er ENOENT ,
+which is set when
+.Va modid
+refers to a kernel module that does not exist (is not loaded).
+.Sh SEE ALSO
+.Xr kldfind 2 ,
+.Xr kldfirstmod 2 ,
+.Xr kldload 2 ,
+.Xr kldnext 2 ,
+.Xr kldstat 2 ,
+.Xr kldsym 2 ,
+.Xr kldunload 2 ,
+.Xr modfind 2 ,
+.Xr modstat 2 ,
+.Xr kld 4 ,
+.Xr kldstat 8
+.Sh HISTORY
+The
+.Nm kld
+interface first appeared in
+.Fx 3.0 .
diff --git a/lib/libc/sys/modstat.2 b/lib/libc/sys/modstat.2
new file mode 100644
index 0000000..5f106b4
--- /dev/null
+++ b/lib/libc/sys/modstat.2
@@ -0,0 +1,127 @@
+.\"
+.\" Copyright (c) 1999 Chris Costello
+.\" All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd July 15, 2008
+.Dt MODSTAT 2
+.Os
+.Sh NAME
+.Nm modstat
+.Nd get status of kernel module
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In sys/param.h
+.In sys/module.h
+.Ft int
+.Fn modstat "int modid" "struct module_stat *stat"
+.Sh DESCRIPTION
+The
+.Fn modstat
+system call writes the info for the kernel module referred to by
+.Fa modid
+into
+.Fa stat .
+.Bd -literal
+struct module_stat {
+	int         version;        /* set to sizeof(module_stat) */
+	char        name[MAXMODNAME];
+	int         refs;
+	int         id;
+	modspecific_t data;
+};
+typedef union modspecific {
+	int         intval;
+	u_int       uintval;
+	long        longval;
+	u_long      ulongval;
+} modspecific_t;
+.Ed
+.Bl -tag -width XXXaddress
+.It version
+This field is set to the size of the structure mentioned above by the code
+calling
+.Fn modstat ,
+and not
+.Fn modstat
+itself.
+.It name
+The name of the module referred to by
+.Fa modid .
+.It refs
+The number of modules referenced by
+.Fa modid .
+.It id
+The id of the module specified in
+.Fa modid .
+.It data
+Module specific data.
+.El
+.Sh RETURN VALUES
+.Rv -std modstat
+.Sh ERRORS
+The information for the module referred to by
+.Fa modid
+is filled into the structure pointed to by
+.Fa stat
+unless:
+.Bl -tag -width Er
+.It Bq Er ENOENT
+The module was not found (probably not loaded).
+.It Bq Er EINVAL
+The version specified in the
+.Fa version
+field of stat is not the proper version.
+You would need to rebuild world, the
+kernel, or your application, if this error occurs, given that you did properly
+fill in the
+.Fa version
+field.
+.It Bq Er EFAULT
+There was a problem copying one, some, or all of the fields into
+.Fa stat
+in the
+.Xr copyout 9
+function.
+.El
+.Sh SEE ALSO
+.Xr kldfind 2 ,
+.Xr kldfirstmod 2 ,
+.Xr kldload 2 ,
+.Xr kldnext 2 ,
+.Xr kldstat 2 ,
+.Xr kldsym 2 ,
+.Xr kldunload 2 ,
+.Xr modfind 2 ,
+.Xr modfnext 2 ,
+.Xr modnext 2 ,
+.Xr kld 4 ,
+.Xr kldstat 8
+.Sh HISTORY
+The
+.Nm kld
+interface first appeared in
+.Fx 3.0 .
diff --git a/lib/libc/sys/mount.2 b/lib/libc/sys/mount.2
new file mode 100644
index 0000000..57ad428
--- /dev/null
+++ b/lib/libc/sys/mount.2
@@ -0,0 +1,383 @@
+.\" Copyright (c) 1980, 1989, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"     @(#)mount.2	8.3 (Berkeley) 5/24/95
+.\" $FreeBSD$
+.\"
+.Dd January 26, 2010
+.Dt MOUNT 2
+.Os
+.Sh NAME
+.Nm mount ,
+.Nm nmount ,
+.Nm unmount
+.Nd mount or dismount a file system
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In sys/param.h
+.In sys/mount.h
+.Ft int
+.Fn mount "const char *type" "const char *dir" "int flags" "void *data"
+.Ft int
+.Fn unmount "const char *dir" "int flags"
+.In sys/uio.h
+.Ft int
+.Fn nmount "struct iovec *iov" "u_int niov" "int flags"
+.Sh DESCRIPTION
+The
+.Fn mount
+system call grafts
+a file system object onto the system file tree
+at the point
+.Fa dir .
+The argument
+.Fa data
+describes the file system object to be mounted.
+The argument
+.Fa type
+tells the kernel how to interpret
+.Fa data
+(See
+.Fa type
+below).
+The contents of the file system
+become available through the new mount point
+.Fa dir .
+Any files in
+.Fa dir
+at the time
+of a successful mount are swept under the carpet so to speak, and
+are unavailable until the file system is unmounted.
+.Pp
+The
+.Fn nmount
+system call behaves similarly to
+.Fn mount ,
+except that the mount options (file system type name, device to mount,
+mount-point name, etc.) are passed as an array of name-value pairs
+in the array
+.Fa iov ,
+containing
+.Fa niov
+elements.
+The following options are required by all file systems:
+.Bl -item -offset indent -compact
+.It
+.Li fstype Ta file system type name (e.g., Dq Li procfs )
+.It
+.Li fspath Ta mount point pathname (e.g., Dq Li /proc )
+.El
+.Pp
+Depending on the file system type, other options may be
+recognized or required;
+for example, most disk-based file systems require a
+.Dq Li from
+option containing the pathname of a special device
+in addition to the options listed above.
+.Pp
+By default only the super-user may call the
+.Fn mount
+system call.
+This restriction can be removed by setting the
+.Va vfs.usermount
+.Xr sysctl 8
+variable
+to a non-zero value; see the BUGS section for more information.
+.Pp
+The following
+.Fa flags
+may be specified to
+suppress default semantics which affect file system access.
+.Bl -tag -width MNT_SYNCHRONOUS
+.It Dv MNT_RDONLY
+The file system should be treated as read-only;
+even the super-user may not write on it.
+Specifying MNT_UPDATE without this option will upgrade
+a read-only file system to read/write.
+.It Dv MNT_NOEXEC
+Do not allow files to be executed from the file system.
+.It Dv MNT_NOSUID
+Do not honor setuid or setgid bits on files when executing them.
+This flag is set automatically when the caller is not the super-user.
+.It Dv MNT_NOATIME
+Disable update of file access times.
+.It Dv MNT_SNAPSHOT
+Create a snapshot of the file system.
+This is currently only supported on UFS2 file systems, see
+.Xr mksnap_ffs 8
+for more information.
+.It Dv MNT_SUIDDIR
+Directories with the SUID bit set chown new files to their own owner.
+This flag requires the SUIDDIR option to have been compiled into the kernel
+to have any effect.
+See the
+.Xr mount 8
+and
+.Xr chmod 2
+pages for more information.
+.It Dv MNT_SYNCHRONOUS
+All I/O to the file system should be done synchronously.
+.It Dv MNT_ASYNC
+All I/O to the file system should be done asynchronously.
+.It Dv MNT_FORCE
+Force a read-write mount even if the file system appears to be unclean.
+Dangerous.
+Together with
+.Dv MNT_UPDATE
+and
+.Dv MNT_RDONLY ,
+specify that the file system is to be forcibly downgraded to a read-only
+mount even if some files are open for writing.
+.It Dv MNT_NOCLUSTERR
+Disable read clustering.
+.It Dv MNT_NOCLUSTERW
+Disable write clustering.
+.El
+.Pp
+The flag
+.Dv MNT_UPDATE
+indicates that the mount command is being applied
+to an already mounted file system.
+This allows the mount flags to be changed without requiring
+that the file system be unmounted and remounted.
+Some file systems may not allow all flags to be changed.
+For example,
+many file systems will not allow a change from read-write to read-only.
+.Pp
+The flag
+.Dv MNT_RELOAD
+causes the vfs subsystem to update its data structures pertaining to
+the specified already mounted file system.
+.Pp
+The
+.Fa type
+argument names the file system.
+The types of file systems known to the system can be obtained with
+.Xr lsvfs 1 .
+.Pp
+The
+.Fa data
+argument
+is a pointer to a structure that contains the type
+specific arguments to mount.
+The format for these argument structures is described in the
+manual page for each file system.
+By convention file system manual pages are named
+by prefixing ``mount_'' to the name of the file system as returned by
+.Xr lsvfs 1 .
+Thus the
+.Tn NFS
+file system is described by the
+.Xr mount_nfs 8
+manual page.
+It should be noted that a manual page for default
+file systems, known as UFS and UFS2, does not exist.
+.Pp
+The
+.Fn unmount
+system call disassociates the file system from the specified
+mount point
+.Fa dir .
+.Pp
+The
+.Fa flags
+argument may include
+.Dv MNT_FORCE
+to specify that the file system should be forcibly unmounted
+even if files are still active.
+Active special devices continue to work,
+but any further accesses to any other active files result in errors
+even if the file system is later remounted.
+.Pp
+If the
+.Dv MNT_BYFSID
+flag is specified,
+.Fa dir
+should instead be a file system ID encoded as
+.Dq Li FSID : Ns Ar val0 : Ns Ar val1 ,
+where
+.Ar val0
+and
+.Ar val1
+are the contents of the
+.Vt fsid_t
+.Va val[]
+array in decimal.
+The file system that has the specified file system ID will be unmounted.
+.Sh RETURN VALUES
+.Rv -std
+.Sh ERRORS
+The
+.Fn mount
+and
+.Fn nmount
+system calls will fail when one of the following occurs:
+.Bl -tag -width Er
+.It Bq Er EPERM
+The caller is neither the super-user nor the owner of
+.Fa dir .
+.It Bq Er ENAMETOOLONG
+A component of a pathname exceeded 255 characters,
+or the entire length of a path name exceeded 1023 characters.
+.It Bq Er ELOOP
+Too many symbolic links were encountered in translating a pathname.
+.It Bq Er ENOENT
+A component of
+.Fa dir
+does not exist.
+.It Bq Er ENOTDIR
+A component of
+.Fa name
+is not a directory,
+or a path prefix of
+.Fa special
+is not a directory.
+.It Bq Er EBUSY
+Another process currently holds a reference to
+.Fa dir .
+.It Bq Er EFAULT
+The
+.Fa dir
+argument
+points outside the process's allocated address space.
+.El
+.Pp
+The following errors can occur for a
+.Em ufs
+file system mount:
+.Bl -tag -width Er
+.It Bq Er ENODEV
+A component of ufs_args
+.Fa fspec
+does not exist.
+.It Bq Er ENOTBLK
+The
+.Fa fspec
+argument
+is not a block device.
+.It Bq Er ENXIO
+The major device number of
+.Fa fspec
+is out of range (this indicates no device driver exists
+for the associated hardware).
+.It Bq Er EBUSY
+.Fa fspec
+is already mounted.
+.It Bq Er EMFILE
+No space remains in the mount table.
+.It Bq Er EINVAL
+The super block for the file system had a bad magic
+number or an out of range block size.
+.It Bq Er ENOMEM
+Not enough memory was available to read the cylinder
+group information for the file system.
+.It Bq Er EIO
+An I/O error occurred while reading the super block or
+cylinder group information.
+.It Bq Er EFAULT
+The
+.Fa fspec
+argument
+points outside the process's allocated address space.
+.El
+.Pp
+The following errors can occur for a
+.Em nfs
+file system mount:
+.Bl -tag -width Er
+.It Bq Er ETIMEDOUT
+.Em Nfs
+timed out trying to contact the server.
+.It Bq Er EFAULT
+Some part of the information described by nfs_args
+points outside the process's allocated address space.
+.El
+.Pp
+The
+.Fn unmount
+system call may fail with one of the following errors:
+.Bl -tag -width Er
+.It Bq Er EPERM
+The caller is neither the super-user nor the user who issued the corresponding
+.Fn mount
+call.
+.It Bq Er ENAMETOOLONG
+The length of the path name exceeded 1023 characters.
+.It Bq Er EINVAL
+The requested directory is not in the mount table.
+.It Bq Er ENOENT
+The file system ID specified using
+.Dv MNT_BYFSID
+was not found in the mount table.
+.It Bq Er EINVAL
+The file system ID specified using
+.Dv MNT_BYFSID
+could not be decoded.
+.It Bq Er EINVAL
+The specified file system is the root file system.
+.It Bq Er EBUSY
+A process is holding a reference to a file located
+on the file system.
+.It Bq Er EIO
+An I/O error occurred while writing cached file system information.
+.It Bq Er EFAULT
+The
+.Fa dir
+argument
+points outside the process's allocated address space.
+.El
+.Pp
+A
+.Em ufs
+mount can also fail if the maximum number of file systems are currently
+mounted.
+.Sh SEE ALSO
+.Xr lsvfs 1 ,
+.Xr mksnap_ffs 8 ,
+.Xr mount 8 ,
+.Xr umount 8
+.Sh HISTORY
+The
+.Fn mount
+and
+.Fn unmount
+functions appeared in
+.At v6 .
+The
+.Fn nmount
+system call first appeared in
+.Fx 5.0 .
+.Sh BUGS
+Some of the error codes need translation to more obvious messages.
+.Pp
+Allowing untrusted users to mount arbitrary media, e.g. by enabling
+.Va vfs.usermount ,
+should not be considered safe.
+Most file systems in
+.Fx
+were not built to safeguard against malicious devices.
diff --git a/lib/libc/sys/mprotect.2 b/lib/libc/sys/mprotect.2
new file mode 100644
index 0000000..8fc3621
--- /dev/null
+++ b/lib/libc/sys/mprotect.2
@@ -0,0 +1,97 @@
+.\" Copyright (c) 1991, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"	@(#)mprotect.2	8.1 (Berkeley) 6/9/93
+.\" $FreeBSD$
+.\"
+.Dd June 9, 1993
+.Dt MPROTECT 2
+.Os
+.Sh NAME
+.Nm mprotect
+.Nd control the protection of pages
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In sys/mman.h
+.Ft int
+.Fn mprotect "const void *addr" "size_t len" "int prot"
+.Sh DESCRIPTION
+The
+.Fn mprotect
+system call
+changes the specified pages to have protection
+.Fa prot .
+Not all implementations will guarantee protection on a page basis;
+the granularity of protection changes may be as large as an entire region.
+A region is the virtual address space defined by the start
+and end addresses of a
+.Vt "struct vm_map_entry" .
+.Pp
+Currently these protection bits are known,
+which can be combined, OR'd together:
+.Pp
+.Bl -tag -width ".Dv PROT_WRITE" -compact
+.It Dv PROT_NONE
+No permissions at all.
+.It Dv PROT_READ
+The pages can be read.
+.It Dv PROT_WRITE
+The pages can be written.
+.It Dv PROT_EXEC
+The pages can be executed.
+.El
+.Sh RETURN VALUES
+.Rv -std mprotect
+.Sh ERRORS
+The
+.Fn mprotect
+system call will fail if:
+.Bl -tag -width Er
+.It Bq Er EINVAL
+The virtual address range specified by the
+.Fa addr
+and
+.Fa len
+arguments is not valid.
+.It Bq Er EACCES
+The calling process was not allowed to change
+the protection to the value specified by
+the
+.Fa prot
+argument.
+.El
+.Sh SEE ALSO
+.Xr madvise 2 ,
+.Xr mincore 2 ,
+.Xr msync 2 ,
+.Xr munmap 2
+.Sh HISTORY
+The
+.Fn mprotect
+system call first appeared in
+.Bx 4.4 .
diff --git a/lib/libc/sys/mq_close.2 b/lib/libc/sys/mq_close.2
new file mode 100644
index 0000000..f9ec062
--- /dev/null
+++ b/lib/libc/sys/mq_close.2
@@ -0,0 +1,105 @@
+.\" Copyright (c) 2005 David Xu <davidxu@FreeBSD.org>
+.\" All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice(s), this list of conditions and the following disclaimer as
+.\"    the first lines of this file unmodified other than the possible
+.\"    addition of one or more copyright notices.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice(s), this list of conditions and the following disclaimer in
+.\"    the documentation and/or other materials provided with the
+.\"    distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) ``AS IS'' AND ANY
+.\" EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+.\" PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) BE
+.\" LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
+.\" BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+.\" WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
+.\" OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
+.\" EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+.\"
+.\" Portions of this text are reprinted and reproduced in electronic form
+.\" from IEEE Std 1003.1, 2004 Edition, Standard for Information Technology --
+.\" Portable Operating System Interface (POSIX), The Open Group Base
+.\" Specifications Issue 6, Copyright (C) 2001-2004 by the Institute of
+.\" Electrical and Electronics Engineers, Inc and The Open Group.  In the
+.\" event of any discrepancy between this version and the original IEEE and
+.\" The Open Group Standard, the original IEEE and The Open Group Standard is
+.\" the referee document.  The original Standard can be obtained online at
+.\"	http://www.opengroup.org/unix/online.html.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd November 29, 2005
+.Dt MQ_CLOSE 2
+.Os
+.Sh NAME
+.Nm mq_close
+.Nd "close a message queue (REALTIME)"
+.Sh LIBRARY
+.Lb librt
+.Sh SYNOPSIS
+.In mqueue.h
+.Ft int
+.Fn mq_close "mqd_t mqdes"
+.Sh DESCRIPTION
+The
+.Fn mq_close
+system call removes the association between the message queue descriptor,
+.Fa mqdes ,
+and its message queue.
+The results of using this message queue descriptor
+after successful return from this
+.Fn mq_close ,
+and until the return of this message queue descriptor from a subsequent
+.Fn mq_open ,
+are undefined.
+.Pp
+If the process has successfully attached a notification request to the
+message queue via this
+.Fa mqdes ,
+this attachment will be removed, and the message queue is available for
+another process to attach for notification.
+.Sh RETURN VALUES
+.Rv -std
+.Sh ERRORS
+The
+.Fn mq_close
+system call
+will fail if:
+.Bl -tag -width Er
+.It Bq Er EBADF
+The
+.Fa mqdes
+argument is not a valid message queue descriptor.
+.El
+.Sh SEE ALSO
+.Xr mq_open 2 ,
+.Xr mq_unlink 2
+.Sh STANDARDS
+The
+.Fn mq_close
+system call conforms to
+.St -p1003.1-2004 .
+.Sh HISTORY
+Support for
+.Tn POSIX
+message queues first appeared in
+.Fx 7.0 .
+.Sh COPYRIGHT
+Portions of this text are reprinted and reproduced in electronic form
+from IEEE Std 1003.1, 2004 Edition, Standard for Information Technology --
+Portable Operating System Interface (POSIX), The Open Group Base
+Specifications Issue 6, Copyright (C) 2001-2004 by the Institute of
+Electrical and Electronics Engineers, Inc and The Open Group.  In the
+event of any discrepancy between this version and the original IEEE and
+The Open Group Standard, the original IEEE and The Open Group Standard is
+the referee document.  The original Standard can be obtained online at
+http://www.opengroup.org/unix/online.html.
diff --git a/lib/libc/sys/mq_getattr.2 b/lib/libc/sys/mq_getattr.2
new file mode 100644
index 0000000..77253fc
--- /dev/null
+++ b/lib/libc/sys/mq_getattr.2
@@ -0,0 +1,127 @@
+.\" Copyright (c) 2005 David Xu <davidxu@FreeBSD.org>
+.\" All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice(s), this list of conditions and the following disclaimer as
+.\"    the first lines of this file unmodified other than the possible
+.\"    addition of one or more copyright notices.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice(s), this list of conditions and the following disclaimer in
+.\"    the documentation and/or other materials provided with the
+.\"    distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) ``AS IS'' AND ANY
+.\" EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+.\" PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) BE
+.\" LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
+.\" BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+.\" WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
+.\" OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
+.\" EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+.\"
+.\" Portions of this text are reprinted and reproduced in electronic form
+.\" from IEEE Std 1003.1, 2004 Edition, Standard for Information Technology --
+.\" Portable Operating System Interface (POSIX), The Open Group Base
+.\" Specifications Issue 6, Copyright (C) 2001-2004 by the Institute of
+.\" Electrical and Electronics Engineers, Inc and The Open Group.  In the
+.\" event of any discrepancy between this version and the original IEEE and
+.\" The Open Group Standard, the original IEEE and The Open Group Standard is
+.\" the referee document.  The original Standard can be obtained online at
+.\"	http://www.opengroup.org/unix/online.html.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd November 29, 2005
+.Dt MQ_GETATTR 2
+.Os
+.Sh NAME
+.Nm mq_getattr
+.Nd "get message queue attributes (REALTIME)"
+.Sh LIBRARY
+.Lb librt
+.Sh SYNOPSIS
+.In mqueue.h
+.Ft int
+.Fn mq_getattr "mqd_t mqdes" "struct mq_attr *mqstat"
+.Sh DESCRIPTION
+The
+.Fn mq_getattr
+system call obtains status information and attributes of the message queue and
+the open message queue description associated with the message queue
+descriptor.
+.Pp
+The
+.Fa mqdes
+argument specifies a message queue descriptor.
+.Pp
+The results are returned in the
+.Vt mq_attr
+structure referenced by the
+.Fa mqstat
+argument.
+.Pp
+Upon return, the following members will have the values associated with the
+open message queue description as set when the message queue was opened and
+as modified by subsequent
+.Fn mq_setattr
+calls:
+.Va mq_flags .
+.Pp
+The following attributes of the message queue will be returned as set at
+message queue creation:
+.Va mq_maxmsg , mq_msgsize .
+.Pp
+Upon return, the following members within the
+.Vt mq_attr
+structure referenced by the
+.Fa mqstat
+argument will be set to the current state
+of the message queue:
+.Bl -tag -width ".Va mq_flags"
+.It Va mq_flags
+The number of messages currently on the queue.
+.El
+.Sh RETURN VALUES
+.Rv -std
+.Sh ERRORS
+The
+.Fn mq_getattr
+system call
+will fail if:
+.Bl -tag -width Er
+.It Bq Er EBADF
+The
+.Fa mqdes
+argument is not a valid message queue descriptor.
+.El
+.Sh SEE ALSO
+.Xr mq_open 2 ,
+.Xr mq_send 2 ,
+.Xr mq_setattr 2 ,
+.Xr mq_timedsend 2
+.Sh STANDARDS
+The
+.Fn mq_getattr
+system call conforms to
+.St -p1003.1-2004 .
+.Sh HISTORY
+Support for
+.Tn POSIX
+message queues first appeared in
+.Fx 7.0 .
+.Sh COPYRIGHT
+Portions of this text are reprinted and reproduced in electronic form
+from IEEE Std 1003.1, 2004 Edition, Standard for Information Technology --
+Portable Operating System Interface (POSIX), The Open Group Base
+Specifications Issue 6, Copyright (C) 2001-2004 by the Institute of
+Electrical and Electronics Engineers, Inc and The Open Group.  In the
+event of any discrepancy between this version and the original IEEE and
+The Open Group Standard, the original IEEE and The Open Group Standard is
+the referee document.  The original Standard can be obtained online at
+http://www.opengroup.org/unix/online.html.
diff --git a/lib/libc/sys/mq_notify.2 b/lib/libc/sys/mq_notify.2
new file mode 100644
index 0000000..1e3a5ad
--- /dev/null
+++ b/lib/libc/sys/mq_notify.2
@@ -0,0 +1,151 @@
+.\" Copyright (c) 2005 David Xu <davidxu@FreeBSD.org>
+.\" All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice(s), this list of conditions and the following disclaimer as
+.\"    the first lines of this file unmodified other than the possible
+.\"    addition of one or more copyright notices.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice(s), this list of conditions and the following disclaimer in
+.\"    the documentation and/or other materials provided with the
+.\"    distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) ``AS IS'' AND ANY
+.\" EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+.\" PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) BE
+.\" LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
+.\" BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+.\" WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
+.\" OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
+.\" EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+.\"
+.\" Portions of this text are reprinted and reproduced in electronic form
+.\" from IEEE Std 1003.1, 2004 Edition, Standard for Information Technology --
+.\" Portable Operating System Interface (POSIX), The Open Group Base
+.\" Specifications Issue 6, Copyright (C) 2001-2004 by the Institute of
+.\" Electrical and Electronics Engineers, Inc and The Open Group.  In the
+.\" event of any discrepancy between this version and the original IEEE and
+.\" The Open Group Standard, the original IEEE and The Open Group Standard is
+.\" the referee document.  The original Standard can be obtained online at
+.\"	http://www.opengroup.org/unix/online.html.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd November 29, 2005
+.Dt MQ_NOTIFY 2
+.Os
+.Sh NAME
+.Nm mq_notify
+.Nd "notify process that a message is available (REALTIME)"
+.Sh LIBRARY
+.Lb librt
+.Sh SYNOPSIS
+.In mqueue.h
+.Ft int
+.Fn mq_notify "mqd_t mqdes" "const struct sigevent *notification"
+.Sh DESCRIPTION
+If the argument notification is not
+.Dv NULL ,
+this system call will register the calling process to be notified of message
+arrival at an empty message queue associated with the specified message
+queue descriptor,
+.Fa mqdes .
+The notification specified by the
+.Fa notification
+argument will be sent to
+the process when the message queue transitions from empty to non-empty.
+At any time, only one process may be registered for notification by a
+message queue.
+If the calling process or any other process has already
+registered for notification of message arrival at the specified message
+queue, subsequent attempts to register for that message queue will fail.
+.Pp
+The
+.Fa notification
+argument points to a
+.Vt sigevent
+structure that defines how the calling process will be notified.
+If
+.Fa notification->sigev_notify
+is
+.Dv SIGEV_NONE ,
+then no signal will be posted, but the error status and the return status
+for the operation will be set appropriately.
+If
+.Fa notification->sigev_notify
+is
+.Dv SIGEV_SIGNAL ,
+then the signal specified in
+.Fa notification->sigev_signo
+will be sent to the process.
+The signal will be queued to the process and the value specified in
+.Fa notification->sigev_value
+will be the
+.Va si_value
+component of the generated signal.
+.Pp
+If
+.Fa notification
+is
+.Dv NULL
+and the process is currently registered for notification by the specified
+message queue, the existing registration will be removed.
+.Pp
+When the notification is sent to the registered process, its registration
+is removed.
+The message queue then is available for registration.
+.Pp
+If a process has registered for notification of message arrival at a
+message queue and some thread is blocked in
+.Fn mq_receive
+waiting to receive a message when a message arrives at the queue, the
+arriving message will satisfy the appropriate
+.Fn mq_receive .
+The resulting behavior is as if the message queue remains empty, and no
+notification will be sent.
+.Sh RETURN VALUES
+.Rv -std
+.Sh ERRORS
+The
+.Fn mq_notify
+system call
+will fail if:
+.Bl -tag -width Er
+.It Bq Er EBADF
+The
+.Fa mqdes
+argument is not a valid message queue descriptor.
+.It Bq Er EBUSY
+Process is already registered for notification by the message queue.
+.El
+.Sh SEE ALSO
+.Xr mq_open 2 ,
+.Xr mq_send 2 ,
+.Xr mq_timedsend 2 ,
+.Xr siginfo 3
+.Sh STANDARDS
+The
+.Fn mq_notify
+system call conforms to
+.St -p1003.1-2004 .
+.Sh HISTORY
+Support for
+.Tn POSIX
+message queues first appeared in
+.Fx 7.0 .
+.Sh COPYRIGHT
+Portions of this text are reprinted and reproduced in electronic form
+from IEEE Std 1003.1, 2004 Edition, Standard for Information Technology --
+Portable Operating System Interface (POSIX), The Open Group Base
+Specifications Issue 6, Copyright (C) 2001-2004 by the Institute of
+Electrical and Electronics Engineers, Inc and The Open Group.  In the
+event of any discrepancy between this version and the original IEEE and
+The Open Group Standard, the original IEEE and The Open Group Standard is
+the referee document.  The original Standard can be obtained online at
+http://www.opengroup.org/unix/online.html.
diff --git a/lib/libc/sys/mq_open.2 b/lib/libc/sys/mq_open.2
new file mode 100644
index 0000000..5acc59b
--- /dev/null
+++ b/lib/libc/sys/mq_open.2
@@ -0,0 +1,323 @@
+.\" Copyright (c) 2005 David Xu <davidxu@FreeBSD.org>
+.\" All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice(s), this list of conditions and the following disclaimer as
+.\"    the first lines of this file unmodified other than the possible
+.\"    addition of one or more copyright notices.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice(s), this list of conditions and the following disclaimer in
+.\"    the documentation and/or other materials provided with the
+.\"    distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) ``AS IS'' AND ANY
+.\" EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+.\" PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) BE
+.\" LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
+.\" BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+.\" WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
+.\" OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
+.\" EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+.\"
+.\" Portions of this text are reprinted and reproduced in electronic form
+.\" from IEEE Std 1003.1, 2004 Edition, Standard for Information Technology --
+.\" Portable Operating System Interface (POSIX), The Open Group Base
+.\" Specifications Issue 6, Copyright (C) 2001-2004 by the Institute of
+.\" Electrical and Electronics Engineers, Inc and The Open Group.  In the
+.\" event of any discrepancy between this version and the original IEEE and
+.\" The Open Group Standard, the original IEEE and The Open Group Standard is
+.\" the referee document.  The original Standard can be obtained online at
+.\"	http://www.opengroup.org/unix/online.html.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd November 29, 2005
+.Dt MQ_OPEN 2
+.Os
+.Sh NAME
+.Nm mq_open
+.Nd "open a message queue (REALTIME)"
+.Sh LIBRARY
+.Lb librt
+.Sh SYNOPSIS
+.In mqueue.h
+.Ft mqd_t
+.Fn mq_open "const char *name" "int oflag" "..."
+.Sh DESCRIPTION
+The
+.Fn mq_open
+system call establishes the connection between a process and a message queue
+with a message queue descriptor.
+It creates an open message queue
+description that refers to the message queue, and a message queue descriptor
+that refers to that open message queue description.
+The message queue
+descriptor is used by other functions to refer to that message queue.
+The
+.Fa name
+argument points to a string naming a message queue.
+The
+.Fa name
+argument should conform to the construction rules for a pathname.
+The
+.Fa name
+should begin with a slash character.
+Processes calling
+.Fn mq_open
+with the same value of
+.Fa name
+refers to the same message queue object, as long as that name has not been
+removed.
+If the
+.Fa name
+argument is not the name of an existing message queue and creation is not
+requested,
+.Fn mq_open
+will fail and return an error.
+.Pp
+The
+.Fa oflag
+argument requests the desired receive and/or send access to the message
+queue.
+The requested access permission to receive messages or send messages
+would be granted if the calling process would be granted read or write access,
+respectively, to an equivalently protected file.
+.Pp
+The value of
+.Fa oflag
+is the bitwise-inclusive OR of values from the following list.
+Applications should specify exactly one of the first three values (access
+modes) below in the value of
+.Fa oflag :
+.Bl -tag -width ".Dv O_NONBLOCK"
+.It Dv O_RDONLY
+Open the message queue for receiving messages.
+The process can use the
+returned message queue descriptor with
+.Fn mq_receive ,
+but not
+.Fn mq_send .
+A message queue may be open multiple times in the same or different processes
+for receiving messages.
+.It Dv O_WRONLY
+Open the queue for sending messages.
+The process can use the returned
+message queue descriptor with
+.Fn mq_send
+but not
+.Fn mq_receive .
+A message queue may be open multiple times in the same or different processes
+for sending messages.
+.It Dv O_RDWR
+Open the queue for both receiving and sending messages.
+The process can use
+any of the functions allowed for
+.Dv O_RDONLY
+and
+.Dv O_WRONLY .
+A message queue may be open multiple times in the same or different processes
+for sending messages.
+.El
+.Pp
+Any combination of the remaining flags may be specified in the value of
+.Fa oflag :
+.Bl -tag -width ".Dv O_NONBLOCK"
+.It Dv O_CREAT
+Create a message queue.
+It requires two additional arguments:
+.Fa mode ,
+which is of type
+.Vt mode_t ,
+and
+.Fa attr ,
+which is a pointer to an
+.Vt mq_attr
+structure.
+If the pathname
+.Fa name
+has already been used to create a message queue that still exists, then
+this flag has no effect, except as noted under
+.Dv O_EXCL .
+Otherwise, a message queue will be created without any messages
+in it.
+The user ID of the message queue will be set to the effective user ID
+of the process, and the group ID of the message queue will be set to the
+effective group ID of the process.
+The permission bits of the message queue
+will be set to the value of the
+.Fa mode
+argument, except those set in the file mode creation mask of the process.
+When bits in
+.Fa mode
+other than the file permission bits are specified, the effect is
+unspecified.
+If
+.Fa attr
+is
+.Dv NULL ,
+the message queue is created with implementation-defined default message
+queue attributes.
+If attr is
+.Pf non- Dv NULL
+and the calling process has the
+appropriate privilege on name, the message queue
+.Va mq_maxmsg
+and
+.Va mq_msgsize
+attributes will be set to the values of the corresponding members in the
+.Vt mq_attr
+structure referred to by
+.Fa attr .
+If
+.Fa attr
+is
+.Pf non- Dv NULL ,
+but the calling process does not have the appropriate privilege
+on name, the
+.Fn mq_open
+function will fail and return an error without creating the message queue.
+.It Dv O_EXCL
+If
+.Dv O_EXCL
+and
+.Dv O_CREAT
+are set,
+.Fn mq_open
+will fail if the message queue name exists.
+.It Dv O_NONBLOCK
+Determines whether an
+.Fn mq_send
+or
+.Fn mq_receive
+waits for resources or messages that are not currently available, or fails
+with
+.Va errno
+set to
+.Er EAGAIN ;
+see
+.Xr mq_send 2
+and
+.Xr mq_receive 2
+for details.
+.El
+.Pp
+The
+.Fn mq_open
+system call does not add or remove messages from the queue.
+.Sh NOTES
+.Fx
+implements message queue based on file descriptor.
+The descriptor
+is inherited by child after
+.Xr fork 2 .
+The descriptor is closed in a new image after
+.Xr exec 3 .
+The
+.Xr select 2
+and
+.Xr kevent 2
+system calls are supported for message queue descriptor.
+.Sh RETURN VALUES
+Upon successful completion, the function returns a message queue
+descriptor; otherwise, the function returns
+.Po Vt mqd_t Pc Ns \-1
+and sets the global variable
+.Va errno
+to indicate the error.
+.Sh ERRORS
+The
+.Fn mq_open
+system call
+will fail if:
+.Bl -tag -width Er
+.It Bq Er EACCES
+The message queue exists and the permissions specified by
+.Fa oflag
+are denied, or the message queue does not exist and permission to create the
+message queue is denied.
+.It Bq Er EEXIST
+.Dv O_CREAT
+and
+.Dv O_EXCL
+are set and the named message queue already exists.
+.It Bq Er EINTR
+The
+.Fn mq_open
+function was interrupted by a signal.
+.It Bq Er EINVAL
+The
+.Fn mq_open
+function is not supported for the given name.
+.It Bq Er EINVAL
+.Dv O_CREAT
+was specified in
+.Fa oflag ,
+the value of
+.Fa attr
+is not
+.Dv NULL ,
+and either
+.Va mq_maxmsg
+or
+.Va mq_msgsize
+was less than or equal to zero.
+.It Bq Er EMFILE
+Too many message queue descriptors or file descriptors are currently in use
+by this process.
+.It Bq Er ENAMETOOLONG
+The length of the
+.Fa name
+argument exceeds
+.Brq Dv PATH_MAX
+or a pathname component
+is longer than
+.Brq Dv NAME_MAX .
+.It Bq Er ENFILE
+Too many message queues are currently open in the system.
+.It Bq Er ENOENT
+.Dv O_CREAT
+is not set and the named message queue does not exist.
+.It Bq Er ENOSPC
+There is insufficient space for the creation of the new message queue.
+.El
+.Sh SEE ALSO
+.Xr mq_close 2 ,
+.Xr mq_getattr 2 ,
+.Xr mq_receive 2 ,
+.Xr mq_send 2 ,
+.Xr mq_setattr 2 ,
+.Xr mq_timedreceive 3 ,
+.Xr mq_timedsend 3 ,
+.Xr mq_unlink 3
+.Sh STANDARDS
+The
+.Fn mq_open
+system call conforms to
+.St -p1003.1-2004 .
+.Sh HISTORY
+Support for
+.Tn POSIX
+message queues first appeared in
+.Fx 7.0 .
+.Sh BUGS
+This implementation places strict requirements on the value of
+.Fa name :
+it must begin with a slash
+.Pq Ql /
+and contain no other slash characters.
+.Sh COPYRIGHT
+Portions of this text are reprinted and reproduced in electronic form
+from IEEE Std 1003.1, 2004 Edition, Standard for Information Technology --
+Portable Operating System Interface (POSIX), The Open Group Base
+Specifications Issue 6, Copyright (C) 2001-2004 by the Institute of
+Electrical and Electronics Engineers, Inc and The Open Group.  In the
+event of any discrepancy between this version and the original IEEE and
+The Open Group Standard, the original IEEE and The Open Group Standard is
+the referee document.  The original Standard can be obtained online at
+http://www.opengroup.org/unix/online.html.
diff --git a/lib/libc/sys/mq_receive.2 b/lib/libc/sys/mq_receive.2
new file mode 100644
index 0000000..730636b
--- /dev/null
+++ b/lib/libc/sys/mq_receive.2
@@ -0,0 +1,217 @@
+.\" Copyright (c) 2005 David Xu <davidxu@FreeBSD.org>
+.\" All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice(s), this list of conditions and the following disclaimer as
+.\"    the first lines of this file unmodified other than the possible
+.\"    addition of one or more copyright notices.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice(s), this list of conditions and the following disclaimer in
+.\"    the documentation and/or other materials provided with the
+.\"    distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) ``AS IS'' AND ANY
+.\" EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+.\" PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) BE
+.\" LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
+.\" BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+.\" WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
+.\" OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
+.\" EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+.\"
+.\" Portions of this text are reprinted and reproduced in electronic form
+.\" from IEEE Std 1003.1, 2004 Edition, Standard for Information Technology --
+.\" Portable Operating System Interface (POSIX), The Open Group Base
+.\" Specifications Issue 6, Copyright (C) 2001-2004 by the Institute of
+.\" Electrical and Electronics Engineers, Inc and The Open Group.  In the
+.\" event of any discrepancy between this version and the original IEEE and
+.\" The Open Group Standard, the original IEEE and The Open Group Standard is
+.\" the referee document.  The original Standard can be obtained online at
+.\"	http://www.opengroup.org/unix/online.html.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd November 29, 2005
+.Dt MQ_RECEIVE 2
+.Os
+.Sh NAME
+.Nm mq_receive , mq_timedreceive
+.Nd "receive a message from message queue (REALTIME)"
+.Sh LIBRARY
+.Lb librt
+.Sh SYNOPSIS
+.In mqueue.h
+.Ft ssize_t
+.Fo mq_receive
+.Fa "mqd_t mqdes"
+.Fa "char *msg_ptr"
+.Fa "size_t msg_len"
+.Fa "unsigned *msg_prio"
+.Fc
+.Ft ssize_t
+.Fo mq_timedreceive
+.Fa "mqd_t mqdes"
+.Fa "char *msg_ptr"
+.Fa "size_t msg_len"
+.Fa "unsigned *msg_prio"
+.Fa "const struct timespec *abs_timeout"
+.Fc
+.Sh DESCRIPTION
+The
+.Fn mq_receive
+system call receives oldest of the highest priority message(s) from the
+message queue specified by
+.Fa mqdes .
+If the size of the buffer in bytes, specified by the
+.Fa msg_len
+argument, is less than the
+.Va mq_msgsize
+attribute of the message queue, the system call will fail and return an
+error.
+Otherwise, the selected message will be removed from the queue
+and copied to the buffer pointed to by the
+.Fa msg_ptr
+argument.
+.Pp
+If the argument
+.Fa msg_prio
+is not
+.Dv NULL ,
+the priority of the selected message will be stored in the
+location referenced by
+.Fa msg_prio .
+If the specified message queue is empty and
+.Dv O_NONBLOCK
+is not set in the message queue description associated with
+.Fa mqdes ,
+.Fn mq_receive
+will block until a message is enqueued on the message queue or until
+.Fn mq_receive
+is interrupted by a signal.
+If more than one thread is waiting to receive
+a message when a message arrives at an empty queue and the Priority
+Scheduling option is supported, then the thread of highest priority that
+has been waiting the longest will be selected to receive the message.
+Otherwise, it is unspecified which waiting thread receives the message.
+If the specified message queue is empty and
+.Dv O_NONBLOCK
+is set in the message queue description associated with
+.Fa mqdes ,
+no message
+will be removed from the queue, and
+.Fn mq_receive
+will return an error.
+.Pp
+The
+.Fn mq_timedreceive
+system call will receive the oldest of the highest priority messages from the
+message queue specified by
+.Fa mqdes
+as described for the
+.Fn mq_receive
+system call.
+However, if
+.Dv O_NONBLOCK
+was not specified when the message queue was opened via the
+.Fn mq_open
+system call, and no message exists on the queue to satisfy the receive, the wait
+for such a message will be terminated when the specified timeout expires.
+If
+.Dv O_NONBLOCK
+is set, this system call is equivalent to
+.Fn mq_receive .
+.Pp
+The timeout expires when the absolute time specified by
+.Fa abs_timeout
+passes, as measured by the clock on which timeouts are based (that is, when
+the value of that clock equals or exceeds
+.Fa abs_timeout ) ,
+or if the absolute time specified by
+.Fa abs_timeout
+has already been passed at the time of the call.
+.Pp
+The timeout is based on the
+.Dv CLOCK_REALTIME
+clock.
+.Sh RETURN VALUES
+Upon successful completion, the
+.Fn mq_receive
+and
+.Fn mq_timedreceive
+system calls return the length of the selected message in bytes and the
+message is removed from the queue.
+Otherwise, no message is removed
+from the queue, the system call returns a value of \-1,
+and the global variable
+.Va errno
+is set to indicate the error.
+.Sh ERRORS
+The
+.Fn mq_receive
+and
+.Fn mq_timedreceive
+system calls
+will fail if:
+.Bl -tag -width Er
+.It Bq Er EAGAIN
+.Dv O_NONBLOCK
+flag is set in the message queue description associated with
+.Fa mqdes ,
+and the specified message queue is empty.
+.It Bq Er EBADF
+The
+.Fa mqdes
+argument is not a valid message queue descriptor open for reading.
+.It Bq Er EMSGSIZE
+The specified message buffer size,
+.Fa msg_len ,
+is less than the message size attribute of the message queue.
+.It Bq Er EINTR
+The
+.Fn mq_receive
+or
+.Fn mq_timedreceive
+operation was interrupted by a signal.
+.It Bq Er EINVAL
+The process or thread would have blocked, and the
+.Fa abs_timeout
+parameter specified a nanoseconds field value less than zero or greater
+than or equal to 1000 million.
+.It Bq Er ETIMEDOUT
+The
+.Dv O_NONBLOCK
+flag was not set when the message queue was opened, but no message arrived
+on the queue before the specified timeout expired.
+.El
+.Sh SEE ALSO
+.Xr mq_open 2 ,
+.Xr mq_send 2 ,
+.Xr mq_timedsend 2
+.Sh STANDARDS
+The
+.Fn mq_receive
+and
+.Fn mq_timedreceive
+system calls conform to
+.St -p1003.1-2004 .
+.Sh HISTORY
+Support for
+.Tn POSIX
+message queues first appeared in
+.Fx 7.0 .
+.Sh COPYRIGHT
+Portions of this text are reprinted and reproduced in electronic form
+from IEEE Std 1003.1, 2004 Edition, Standard for Information Technology --
+Portable Operating System Interface (POSIX), The Open Group Base
+Specifications Issue 6, Copyright (C) 2001-2004 by the Institute of
+Electrical and Electronics Engineers, Inc and The Open Group.  In the
+event of any discrepancy between this version and the original IEEE and
+The Open Group Standard, the original IEEE and The Open Group Standard is
+the referee document.  The original Standard can be obtained online at
+http://www.opengroup.org/unix/online.html.
diff --git a/lib/libc/sys/mq_send.2 b/lib/libc/sys/mq_send.2
new file mode 100644
index 0000000..6f18b90
--- /dev/null
+++ b/lib/libc/sys/mq_send.2
@@ -0,0 +1,236 @@
+.\" Copyright (c) 2005 David Xu <davidxu@FreeBSD.org>
+.\" All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice(s), this list of conditions and the following disclaimer as
+.\"    the first lines of this file unmodified other than the possible
+.\"    addition of one or more copyright notices.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice(s), this list of conditions and the following disclaimer in
+.\"    the documentation and/or other materials provided with the
+.\"    distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) ``AS IS'' AND ANY
+.\" EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+.\" PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) BE
+.\" LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
+.\" BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+.\" WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
+.\" OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
+.\" EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+.\"
+.\" Portions of this text are reprinted and reproduced in electronic form
+.\" from IEEE Std 1003.1, 2004 Edition, Standard for Information Technology --
+.\" Portable Operating System Interface (POSIX), The Open Group Base
+.\" Specifications Issue 6, Copyright (C) 2001-2004 by the Institute of
+.\" Electrical and Electronics Engineers, Inc and The Open Group.  In the
+.\" event of any discrepancy between this version and the original IEEE and
+.\" The Open Group Standard, the original IEEE and The Open Group Standard is
+.\" the referee document.  The original Standard can be obtained online at
+.\"	http://www.opengroup.org/unix/online.html.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd November 29, 2005
+.Dt MQ_SEND 2
+.Os
+.Sh NAME
+.Nm mq_send , mq_timedsend
+.Nd "send a message to message queue (REALTIME)"
+.Sh LIBRARY
+.Lb librt
+.Sh SYNOPSIS
+.In mqueue.h
+.Ft int
+.Fo mq_send
+.Fa "mqd_t mqdes"
+.Fa "const char *msg_ptr"
+.Fa "size_t msg_len"
+.Fa "unsigned msg_prio"
+.Fc
+.Ft int
+.Fo mq_timedsend
+.Fa "mqd_t mqdes"
+.Fa "const char *msg_ptr"
+.Fa "size_t msg_len"
+.Fa "unsigned msg_prio"
+.Fa "const struct timespec *abs_timeout"
+.Fc
+.Sh DESCRIPTION
+The
+.Fn mq_send
+system call adds the message pointed to by the argument
+.Fa msg_ptr
+to the message queue specified by
+.Fa mqdes .
+The
+.Fa msg_len
+argument specifies the length of the message, in bytes, pointed to by
+.Fa msg_ptr .
+The value of
+.Fa msg_len
+should be less than or equal to the
+.Va mq_msgsize
+attribute of the message queue, or
+.Fn mq_send
+will fail.
+.Pp
+If the specified message queue is not full,
+.Fn mq_send
+will behave as if the message is inserted into the message queue at
+the position indicated by the
+.Fa msg_prio
+argument.
+A message with a larger numeric value of
+.Fa msg_prio
+will be inserted before messages with lower values of
+.Fa msg_prio .
+A message will be inserted after other messages in the queue, if any,
+with equal
+.Fa msg_prio .
+The value of
+.Fa msg_prio
+should be less than
+.Brq Dv MQ_PRIO_MAX .
+.Pp
+If the specified message queue is full and
+.Dv O_NONBLOCK
+is not set in the message queue description associated with
+.Fa mqdes ,
+.Fn mq_send
+will block until space becomes available to enqueue the
+message, or until
+.Fn mq_send
+is interrupted by a signal.
+If more than one thread is
+waiting to send when space becomes available in the message queue and
+the Priority Scheduling option is supported, then the thread of the
+highest priority that has been waiting the longest will be unblocked
+to send its message.
+Otherwise, it is unspecified which waiting thread
+is unblocked.
+If the specified message queue is full and
+.Dv O_NONBLOCK
+is set in the message queue description associated with
+.Fa mqdes ,
+the message will not be queued and
+.Fn mq_send
+will return an error.
+.Pp
+The
+.Fn mq_timedsend
+system call will add a message to the message queue specified by
+.Fa mqdes
+in the manner defined for the
+.Fn mq_send
+system call.
+However, if the specified message queue is full and
+.Dv O_NONBLOCK
+is not set in the message queue description associated with
+.Fa mqdes ,
+the wait for sufficient room in the queue will be terminated when
+the specified timeout expires.
+If
+.Dv O_NONBLOCK
+is set in the message queue description, this system call is
+equivalent to
+.Fn mq_send .
+.Pp
+The timeout will expire when the absolute time specified by
+.Fa abs_timeout
+passes, as measured by the clock on which timeouts are based (that is,
+when the value of that clock equals or exceeds
+.Fa abs_timeout ) ,
+or if the absolute time specified by
+.Fa abs_timeout
+has already been passed at the time of the call.
+.Pp
+The timeout is based on the
+.Dv CLOCK_REALTIME
+clock.
+.Sh RETURN VALUES
+Upon successful completion, the
+.Fn mq_send
+and
+.Fn mq_timedsend
+system calls return a value of zero.
+Otherwise, no message will be
+enqueued, the system calls return \-1, and
+the global variable
+.Va errno
+is set to indicate the error.
+.Sh ERRORS
+The
+.Fn mq_send
+and
+.Fn mq_timedsend
+system calls
+will fail if:
+.Bl -tag -width Er
+.It Bq Er EAGAIN
+The
+.Dv O_NONBLOCK
+flag is set in the message queue description associated with
+.Fa mqdes ,
+and the specified message queue is full.
+.It Bq Er EBADF
+The
+.Fa mqdes
+argument is not a valid message queue descriptor open for writing.
+.It Bq Er EINTR
+A signal interrupted the call to
+.Fn mq_send
+or
+.Fn mq_timedsend .
+.It Bq Er EINVAL
+The value of
+.Fa msg_prio
+was outside the valid range.
+.It Bq Er EINVAL
+The process or thread would have blocked, and the
+.Fa abs_timeout
+parameter specified a nanoseconds field value less than zero or greater
+than or equal to 1000 million.
+.It Bq Er EMSGSIZE
+The specified message length,
+.Fa msg_len ,
+exceeds the message size attribute of the message queue.
+.It Bq Er ETIMEDOUT
+The
+.Dv O_NONBLOCK
+flag was not set when the message queue was opened, but the timeout
+expired before the message could be added to the queue.
+.El
+.Sh SEE ALSO
+.Xr mq_open 2 ,
+.Xr mq_receive 2 ,
+.Xr mq_setattr 2 ,
+.Xr mq_timedreceive 2
+.Sh STANDARDS
+The
+.Fn mq_send
+and
+.Fn mq_timedsend
+system calls conform to
+.St -p1003.1-2004 .
+.Sh HISTORY
+Support for
+.Tn POSIX
+message queues first appeared in
+.Fx 7.0 .
+.Sh COPYRIGHT
+Portions of this text are reprinted and reproduced in electronic form
+from IEEE Std 1003.1, 2004 Edition, Standard for Information Technology --
+Portable Operating System Interface (POSIX), The Open Group Base
+Specifications Issue 6, Copyright (C) 2001-2004 by the Institute of
+Electrical and Electronics Engineers, Inc and The Open Group.  In the
+event of any discrepancy between this version and the original IEEE and
+The Open Group Standard, the original IEEE and The Open Group Standard is
+the referee document.  The original Standard can be obtained online at
+http://www.opengroup.org/unix/online.html.
diff --git a/lib/libc/sys/mq_setattr.2 b/lib/libc/sys/mq_setattr.2
new file mode 100644
index 0000000..2e5a6b1
--- /dev/null
+++ b/lib/libc/sys/mq_setattr.2
@@ -0,0 +1,123 @@
+.\" Copyright (c) 2005 David Xu <davidxu@FreeBSD.org>
+.\" All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice(s), this list of conditions and the following disclaimer as
+.\"    the first lines of this file unmodified other than the possible
+.\"    addition of one or more copyright notices.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice(s), this list of conditions and the following disclaimer in
+.\"    the documentation and/or other materials provided with the
+.\"    distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) ``AS IS'' AND ANY
+.\" EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+.\" PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) BE
+.\" LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
+.\" BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+.\" WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
+.\" OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
+.\" EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+.\"
+.\" Portions of this text are reprinted and reproduced in electronic form
+.\" from IEEE Std 1003.1, 2004 Edition, Standard for Information Technology --
+.\" Portable Operating System Interface (POSIX), The Open Group Base
+.\" Specifications Issue 6, Copyright (C) 2001-2004 by the Institute of
+.\" Electrical and Electronics Engineers, Inc and The Open Group.  In the
+.\" event of any discrepancy between this version and the original IEEE and
+.\" The Open Group Standard, the original IEEE and The Open Group Standard is
+.\" the referee document.  The original Standard can be obtained online at
+.\"	http://www.opengroup.org/unix/online.html.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd November 29, 2005
+.Dt MQ_SETATTR 2
+.Os
+.Sh NAME
+.Nm mq_setattr
+.Nd "set message queue attributes (REALTIME)"
+.Sh LIBRARY
+.Lb librt
+.Sh SYNOPSIS
+.In mqueue.h
+.Ft int
+.Fo mq_setattr
+.Fa "mqd_t mqdes"
+.Fa "struct mq_attr *restrict mqstat"
+.Fa "struct mq_attr *restrict omqstat"
+.Fc
+.Sh DESCRIPTION
+The
+.Fn mq_setattr
+system call sets attributes associated with the open message queue description
+referenced by the message queue descriptor specified by
+.Fa mqdes .
+The message queue attributes corresponding to the following members defined
+in the
+.Vt mq_attr
+structure will be set to the specified values upon successful completion of
+.Fn mq_setattr :
+.Bl -tag -width ".Va mq_flags"
+.It Va mq_flags
+The value of this member is zero or
+.Dv O_NONBLOCK .
+.El
+.Pp
+The values of the
+.Va mq_maxmsg , mq_msgsize ,
+and
+.Va mq_curmsgs
+members of the
+.Vt mq_attr
+structure are ignored by
+.Fn mq_setattr .
+.Sh RETURN VALUES
+Upon successful completion, the function returns a value of zero and the
+attributes of the message queue will have been changed as specified.
+.Pp
+Otherwise, the message queue attributes are unchanged, and the function
+returns a value of \-1 and sets the global variable
+.Va errno
+to indicate the error.
+.Sh ERRORS
+The
+.Fn mq_setattr
+system call
+will fail if:
+.Bl -tag -width Er
+.It Bq Er EBADF
+The
+.Fa mqdes
+argument is not a valid message queue descriptor.
+.El
+.Sh SEE ALSO
+.Xr mq_open 2 ,
+.Xr mq_send 2 ,
+.Xr mq_timedsend 2
+.Sh STANDARDS
+The
+.Fn mq_setattr
+system call conforms to
+.St -p1003.1-2004 .
+.Sh HISTORY
+Support for
+.Tn POSIX
+message queues first appeared in
+.Fx 7.0 .
+.Sh COPYRIGHT
+Portions of this text are reprinted and reproduced in electronic form
+from IEEE Std 1003.1, 2004 Edition, Standard for Information Technology --
+Portable Operating System Interface (POSIX), The Open Group Base
+Specifications Issue 6, Copyright (C) 2001-2004 by the Institute of
+Electrical and Electronics Engineers, Inc and The Open Group.  In the
+event of any discrepancy between this version and the original IEEE and
+The Open Group Standard, the original IEEE and The Open Group Standard is
+the referee document.  The original Standard can be obtained online at
+http://www.opengroup.org/unix/online.html.
diff --git a/lib/libc/sys/msgctl.2 b/lib/libc/sys/msgctl.2
new file mode 100644
index 0000000..34c5263
--- /dev/null
+++ b/lib/libc/sys/msgctl.2
@@ -0,0 +1,210 @@
+.\"	$NetBSD: msgctl.2,v 1.1 1995/10/16 23:49:15 jtc Exp $
+.\"
+.\" Copyright (c) 1995 Frank van der Linden
+.\" All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 3. All advertising materials mentioning features or use of this software
+.\"    must display the following acknowledgement:
+.\"      This product includes software developed for the NetBSD Project
+.\"      by Frank van der Linden
+.\" 4. The name of the author may not be used to endorse or promote products
+.\"    derived from this software without specific prior written permission
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+.\"
+.\" $FreeBSD$
+.\"/
+.Dd July 9, 2009
+.Dt MSGCTL 2
+.Os
+.Sh NAME
+.Nm msgctl
+.Nd message control operations
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In sys/types.h
+.In sys/ipc.h
+.In sys/msg.h
+.Ft int
+.Fn msgctl "int msqid" "int cmd" "struct msqid_ds *buf"
+.Sh DESCRIPTION
+The
+.Fn msgctl
+system call performs some control operations on the message queue specified
+by
+.Fa msqid .
+.Pp
+Each message queue has a data structure associated with it, parts of which
+may be altered by
+.Fn msgctl
+and parts of which determine the actions of
+.Fn msgctl .
+The data structure is defined in
+.In sys/msg.h
+and contains (amongst others) the following members:
+.Bd -literal
+struct msqid_ds {
+	struct	ipc_perm msg_perm;	/* msg queue permission bits */
+	struct	msg *msg_first;	/* first message in the queue */
+	struct	msg *msg_last;	/* last message in the queue */
+	msglen_t msg_cbytes;	/* number of bytes in use on the queue */
+	msgqnum_t msg_qnum;	/* number of msgs in the queue */
+	msglen_t msg_qbytes;	/* max # of bytes on the queue */
+	pid_t	msg_lspid;	/* pid of last msgsnd() */
+	pid_t	msg_lrpid;	/* pid of last msgrcv() */
+	time_t	msg_stime;	/* time of last msgsnd() */
+	time_t	msg_rtime;	/* time of last msgrcv() */
+	time_t	msg_ctime;	/* time of last msgctl() */
+};
+.Ed
+.Pp
+The
+.Vt ipc_perm
+structure used inside the
+.Vt msqid_ds
+structure is defined in
+.In sys/ipc.h
+and looks like this:
+.Bd -literal
+struct ipc_perm {
+	uid_t		cuid;	/* creator user id */
+	gid_t		cgid;	/* creator group id */
+	uid_t		uid;	/* user id */
+	gid_t		gid;	/* group id */
+	mode_t		mode;	/* r/w permission */
+	unsigned short	seq;	/* sequence # (to generate unique ipcid) */
+	key_t		key;	/* user specified msg/sem/shm key */
+};
+.Ed
+.Pp
+The operation to be performed by
+.Fn msgctl
+is specified in
+.Fa cmd
+and is one of:
+.Bl -tag -width IPC_RMIDX
+.It Dv IPC_STAT
+Gather information about the message queue and place it in the
+structure pointed to by
+.Fa buf .
+.It Dv IPC_SET
+Set the value of the
+.Va msg_perm.uid ,
+.Va msg_perm.gid ,
+.Va msg_perm.mode
+and
+.Va msg_qbytes
+fields in the structure associated with
+.Fa msqid .
+The values are taken from the corresponding fields in the structure
+pointed to by
+.Fa buf .
+This operation can only be executed by the super-user, or a process that
+has an effective user id equal to either
+.Va msg_perm.cuid
+or
+.Va msg_perm.uid
+in the data structure associated with the message queue.
+The value of
+.Va msg_qbytes
+can only be increased by the super-user.
+Values for
+.Va msg_qbytes
+that exceed the system limit (MSGMNB from
+.In sys/msg.h )
+are silently truncated to that limit.
+.It Dv IPC_RMID
+Remove the message queue specified by
+.Fa msqid
+and destroy the data associated with it.
+Only the super-user or a process
+with an effective uid equal to the
+.Va msg_perm.cuid
+or
+.Va msg_perm.uid
+values in the data structure associated with the queue can do this.
+.El
+.Pp
+The permission to read from or write to a message queue (see
+.Xr msgsnd 2
+and
+.Xr msgrcv 2 )
+is determined by the
+.Va msg_perm.mode
+field in the same way as is
+done with files (see
+.Xr chmod 2 ) ,
+but the effective uid can match either the
+.Va msg_perm.cuid
+field or the
+.Va msg_perm.uid
+field, and the
+effective gid can match either
+.Va msg_perm.cgid
+or
+.Va msg_perm.gid .
+.Sh RETURN VALUES
+.Rv -std msgctl
+.Sh ERRORS
+The
+.Fn msgctl
+function
+will fail if:
+.Bl -tag -width Er
+.It Bq Er EPERM
+The
+.Fa cmd
+argument
+is equal to IPC_SET or IPC_RMID and the caller is not the super-user, nor does
+the effective uid match either the
+.Va msg_perm.uid
+or
+.Va msg_perm.cuid
+fields of the data structure associated with the message queue.
+.Pp
+An attempt is made to increase the value of
+.Va msg_qbytes
+through IPC_SET
+but the caller is not the super-user.
+.It Bq Er EACCES
+The command is IPC_STAT
+and the caller has no read permission for this message queue.
+.It Bq Er EINVAL
+The
+.Fa msqid
+argument
+is not a valid message queue identifier.
+.Pp
+.Va cmd
+is not a valid command.
+.It Bq Er EFAULT
+The
+.Fa buf
+argument
+specifies an invalid address.
+.El
+.Sh SEE ALSO
+.Xr msgget 2 ,
+.Xr msgrcv 2 ,
+.Xr msgsnd 2
+.Sh HISTORY
+Message queues appeared in the first release of
+.At V .
diff --git a/lib/libc/sys/msgget.2 b/lib/libc/sys/msgget.2
new file mode 100644
index 0000000..27e1766
--- /dev/null
+++ b/lib/libc/sys/msgget.2
@@ -0,0 +1,141 @@
+.\"	$NetBSD: msgget.2,v 1.1 1995/10/16 23:49:19 jtc Exp $
+.\"
+.\" Copyright (c) 1995 Frank van der Linden
+.\" All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 3. All advertising materials mentioning features or use of this software
+.\"    must display the following acknowledgement:
+.\"      This product includes software developed for the NetBSD Project
+.\"      by Frank van der Linden
+.\" 4. The name of the author may not be used to endorse or promote products
+.\"    derived from this software without specific prior written permission
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+.\" $FreeBSD$
+.\"
+.\"/
+.Dd July 9, 2009
+.Dt MSGGET 2
+.Os
+.Sh NAME
+.Nm msgget
+.Nd get message queue
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In sys/types.h
+.In sys/ipc.h
+.In sys/msg.h
+.Ft int
+.Fn msgget "key_t key" "int msgflg"
+.Sh DESCRIPTION
+The
+.Fn msgget
+function
+returns the message queue identifier associated with
+.Fa key .
+A message queue identifier is a unique integer greater than zero.
+.Pp
+A message queue is created if either
+.Fa key
+is equal to
+.Dv IPC_PRIVATE ,
+or
+.Fa key
+does not have a message queue identifier associated with it, and the
+.Dv IPC_CREAT
+bit is set in
+.Fa msgflg .
+.Pp
+If a new message queue is created, the data structure associated with it (the
+.Va msqid_ds
+structure, see
+.Xr msgctl 2 )
+is initialized as follows:
+.Bl -bullet
+.It
+.Va msg_perm.cuid
+and
+.Va msg_perm.uid
+are set to the effective uid of the calling process.
+.It
+.Va msg_perm.gid
+and
+.Va msg_perm.cgid
+are set to the effective gid of the calling process.
+.It
+.Va msg_perm.mode
+is set to the lower 9 bits of
+.Fa msgflg .
+.It
+.Va msg_cbytes ,
+.Va msg_qnum ,
+.Va msg_lspid ,
+.Va msg_lrpid ,
+.Va msg_rtime ,
+and
+.Va msg_stime
+are set to 0.
+.It
+.Va msg_qbytes
+is set to the system wide maximum value for the number of bytes in a queue
+.Pf ( Dv MSGMNB ) .
+.It
+.Va msg_ctime
+is set to the current time.
+.El
+.Sh RETURN VALUES
+Upon successful completion a positive message queue identifier is returned.
+Otherwise, -1 is returned and the global variable
+.Va errno
+is set to indicate the error.
+.Sh ERRORS
+.Bl -tag -width Er
+.It Bq Er EACCES
+A message queue is already associated with
+.Fa key
+and the caller has no permission to access it.
+.It Bq Er EEXIST
+Both
+.Dv IPC_CREAT
+and
+.Dv IPC_EXCL
+are set in
+.Fa msgflg ,
+and a message queue is already associated with
+.Fa key .
+.It Bq Er ENOSPC
+A new message queue could not be created because the system limit for
+the number of message queues has been reached.
+.It Bq Er ENOENT
+.Dv IPC_CREAT
+was not set in
+.Fa msgflg
+and no message queue associated with
+.Fa key
+was found.
+.El
+.Sh SEE ALSO
+.Xr msgctl 2 ,
+.Xr msgrcv 2 ,
+.Xr msgsnd 2
+.Sh HISTORY
+Message queues appeared in the first release of
+.At V .
diff --git a/lib/libc/sys/msgrcv.2 b/lib/libc/sys/msgrcv.2
new file mode 100644
index 0000000..917a953
--- /dev/null
+++ b/lib/libc/sys/msgrcv.2
@@ -0,0 +1,222 @@
+.\"	$NetBSD: msgrcv.2,v 1.1 1995/10/16 23:49:20 jtc Exp $
+.\"
+.\" Copyright (c) 1995 Frank van der Linden
+.\" All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 3. All advertising materials mentioning features or use of this software
+.\"    must display the following acknowledgement:
+.\"      This product includes software developed for the NetBSD Project
+.\"      by Frank van der Linden
+.\" 4. The name of the author may not be used to endorse or promote products
+.\"    derived from this software without specific prior written permission
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+.\" $FreeBSD$
+.\"
+.\"/
+.Dd July 9, 2009
+.Dt MSGRCV 2
+.Os
+.Sh NAME
+.Nm msgrcv
+.Nd receive a message from a message queue
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In sys/types.h
+.In sys/ipc.h
+.In sys/msg.h
+.Ft int
+.Fn msgrcv "int msqid" "void *msgp" "size_t msgsz" "long msgtyp" "int msgflg"
+.Sh DESCRIPTION
+The
+.Fn msgrcv
+function receives a message from the message queue specified in
+.Fa msqid ,
+and places it into the structure pointed to by
+.Fa msgp .
+This structure should consist of the following members:
+.Bd -literal
+    long mtype;    /* message type */
+    char mtext[1]; /* body of message */
+.Ed
+.Pp
+.Va mtype
+is an integer greater than 0 that can be used for selecting messages,
+.Va mtext
+is an array of bytes, with a size up to that of the system limit
+.Pf ( Dv MSGMAX ) .
+.Pp
+The value of
+.Fa msgtyp
+has one of the following meanings:
+.Bl -bullet
+.It
+The
+.Fa msgtyp
+argument
+is greater than 0.
+The first message of type
+.Fa msgtyp
+will be received.
+.It
+The
+.Fa msgtyp
+argument
+is equal to 0.
+The first message on the queue will be received.
+.It
+The
+.Fa msgtyp
+argument
+is less than 0.
+The first message of the lowest message type that is
+less than or equal to the absolute value of
+.Fa msgtyp
+will be received.
+.El
+.Pp
+The
+.Fa msgsz
+argument
+specifies the maximum length of the requested message.
+If the received
+message has a length greater than
+.Fa msgsz
+it will be silently truncated if the
+.Dv MSG_NOERROR
+flag is set in
+.Fa msgflg ,
+otherwise an error will be returned.
+.Pp
+If no matching message is present on the message queue specified by
+.Fa msqid ,
+the behavior of
+.Fn msgrcv
+depends on whether the
+.Dv IPC_NOWAIT
+flag is set in
+.Fa msgflg
+or not.
+If
+.Dv IPC_NOWAIT
+is set,
+.Fn msgrcv
+will immediately return a value of -1, and set
+.Va errno
+to
+.Er ENOMSG .
+If
+.Dv IPC_NOWAIT
+is not set, the calling process will be blocked
+until:
+.Bl -bullet
+.It
+A message of the requested type becomes available on the message queue.
+.It
+The message queue is removed, in which case -1 will be returned, and
+.Va errno
+set to
+.Er EINVAL .
+.It
+A signal is received and caught.
+-1 is returned, and
+.Va errno
+set to
+.Er EINTR .
+.El
+.Pp
+If a message is successfully received, the data structure associated with
+.Fa msqid
+is updated as follows:
+.Bl -bullet
+.It
+.Va msg_cbytes
+is decremented by the size of the message.
+.It
+.Va msg_lrpid
+is set to the pid of the caller.
+.It
+.Va msg_lrtime
+is set to the current time.
+.It
+.Va msg_qnum
+is decremented by 1.
+.El
+.Sh RETURN VALUES
+Upon successful completion,
+.Fn msgrcv
+returns the number of bytes received into the
+.Va mtext
+field of the structure pointed to by
+.Fa msgp .
+Otherwise, -1 is returned, and
+.Va errno
+set to indicate the error.
+.Sh ERRORS
+The
+.Fn msgrcv
+function
+will fail if:
+.Bl -tag -width Er
+.It Bq Er EINVAL
+The
+.Fa msqid
+argument
+is not a valid message queue identifier.
+.Pp
+The message queue was removed while
+.Fn msgrcv
+was waiting for a message of the requested type to become available on it.
+.Pp
+The
+.Fa msgsz
+argument
+is less than 0.
+.It Bq Er E2BIG
+A matching message was received, but its size was greater than
+.Fa msgsz
+and the
+.Dv MSG_NOERROR
+flag was not set in
+.Fa msgflg .
+.It Bq Er EACCES
+The calling process does not have read access to the message queue.
+.It Bq Er EFAULT
+The
+.Fa msgp
+argument
+points to an invalid address.
+.It Bq Er EINTR
+The system call was interrupted by the delivery of a signal.
+.It Bq Er ENOMSG
+There is no message of the requested type available on the message queue,
+and
+.Dv IPC_NOWAIT
+is set in
+.Fa msgflg .
+.El
+.Sh SEE ALSO
+.Xr msgctl 2 ,
+.Xr msgget 2 ,
+.Xr msgsnd 2
+.Sh HISTORY
+Message queues appeared in the first release of
+.At V .
diff --git a/lib/libc/sys/msgsnd.2 b/lib/libc/sys/msgsnd.2
new file mode 100644
index 0000000..d6333bb
--- /dev/null
+++ b/lib/libc/sys/msgsnd.2
@@ -0,0 +1,184 @@
+.\"	$NetBSD: msgsnd.2,v 1.1 1995/10/16 23:49:24 jtc Exp $
+.\"
+.\" Copyright (c) 1995 Frank van der Linden
+.\" All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 3. All advertising materials mentioning features or use of this software
+.\"    must display the following acknowledgement:
+.\"      This product includes software developed for the NetBSD Project
+.\"      by Frank van der Linden
+.\" 4. The name of the author may not be used to endorse or promote products
+.\"    derived from this software without specific prior written permission
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd July 9, 2009
+.Dt MSGSND 2
+.Os
+.Sh NAME
+.Nm msgsnd
+.Nd send a message to a message queue
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In sys/types.h
+.In sys/ipc.h
+.In sys/msg.h
+.Ft int
+.Fn msgsnd "int msqid" "const void *msgp" "size_t msgsz" "int msgflg"
+.Sh DESCRIPTION
+The
+.Fn msgsnd
+function sends a message to the message queue specified in
+.Fa msqid .
+The
+.Fa msgp
+argument
+points to a structure containing the message.
+This structure should
+consist of the following members:
+.Bd -literal
+    long mtype;    /* message type */
+    char mtext[1]; /* body of message */
+.Ed
+.Pp
+.Va mtype
+is an integer greater than 0 that can be used for selecting messages (see
+.Xr msgrcv 2 ) ,
+.Va mtext
+is an array of
+.Fa msgsz
+bytes.
+The argument
+.Fa msgsz
+can range from 0 to a system-imposed maximum,
+.Dv MSGMAX .
+.Pp
+If the number of bytes already on the message queue plus
+.Fa msgsz
+is bigger than the maximum number of bytes on the message queue
+.Pf ( Va msg_qbytes ,
+see
+.Xr msgctl 2 ) ,
+or the number of messages on all queues system-wide is already equal to
+the system limit,
+.Fa msgflg
+determines the action of
+.Fn msgsnd .
+If
+.Fa msgflg
+has
+.Dv IPC_NOWAIT
+mask set in it, the call will return immediately.
+If
+.Fa msgflg
+does not have
+.Dv IPC_NOWAIT
+set in it, the call will block until:
+.Bl -bullet
+.It
+The condition which caused the call to block does no longer exist.
+The message will be sent.
+.It
+The message queue is removed, in which case -1 will be returned, and
+.Va errno
+is set to
+.Er EINVAL .
+.It
+The caller catches a signal.
+The call returns with
+.Va errno
+set to
+.Er EINTR .
+.El
+.Pp
+After a successful call, the data structure associated with the message
+queue is updated in the following way:
+.Bl -bullet
+.It
+.Va msg_cbytes
+is incremented by the size of the message.
+.It
+.Va msg_qnum
+is incremented by 1.
+.It
+.Va msg_lspid
+is set to the pid of the calling process.
+.It
+.Va msg_stime
+is set to the current time.
+.El
+.Sh RETURN VALUES
+.Rv -std msgsnd
+.Sh ERRORS
+The
+.Fn msgsnd
+function
+will fail if:
+.Bl -tag -width Er
+.It Bq Er EINVAL
+The
+.Fa msqid
+argument
+is not a valid message queue identifier
+.Pp
+The message queue was removed while
+.Fn msgsnd
+was waiting for a resource to become available in order to deliver the
+message.
+.Pp
+The
+.Fa msgsz
+argument
+is greater than
+.Va msg_qbytes .
+.Pp
+The
+.Fa mtype
+argument
+is not greater than 0.
+.It Bq Er EACCES
+The calling process does not have write access to the message queue.
+.It Bq Er EAGAIN
+There was no space for this message either on the queue, or in the whole
+system, and
+.Dv IPC_NOWAIT
+was set in
+.Fa msgflg .
+.It Bq Er EFAULT
+The
+.Fa msgp
+argument
+points to an invalid address.
+.It Bq Er EINTR
+The system call was interrupted by the delivery of a signal.
+.El
+.Sh HISTORY
+Message queues appeared in the first release of AT&T Unix System V.
+.Sh BUGS
+.Nx
+and
+.Fx
+do not define the
+.Er EIDRM
+error value, which should be used
+in the case of a removed message queue.
diff --git a/lib/libc/sys/msync.2 b/lib/libc/sys/msync.2
new file mode 100644
index 0000000..cb15925
--- /dev/null
+++ b/lib/libc/sys/msync.2
@@ -0,0 +1,121 @@
+.\" Copyright (c) 1991, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"	@(#)msync.2	8.2 (Berkeley) 6/21/94
+.\" $FreeBSD$
+.\"
+.Dd June 21, 1994
+.Dt MSYNC 2
+.Os
+.Sh NAME
+.Nm msync
+.Nd synchronize a mapped region
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In sys/mman.h
+.Ft int
+.Fn msync "void *addr" "size_t len" "int flags"
+.Sh DESCRIPTION
+The
+.Fn msync
+system call
+writes any modified pages back to the file system and updates
+the file modification time.
+If
+.Fa len
+is 0, all modified pages within the region containing
+.Fa addr
+will be flushed;
+if
+.Fa len
+is non-zero, only those pages containing
+.Fa addr
+and
+.Fa len-1
+succeeding locations will be examined.
+The
+.Fa flags
+argument may be specified as follows:
+.Pp
+.Bl -tag -width ".Dv MS_INVALIDATE" -compact
+.It Dv MS_ASYNC
+Return immediately
+.It Dv MS_SYNC
+Perform synchronous writes
+.It Dv MS_INVALIDATE
+Invalidate all cached data
+.El
+.Sh RETURN VALUES
+.Rv -std msync
+.Sh ERRORS
+The
+.Fn msync
+system call
+will fail if:
+.Bl -tag -width Er
+.It Bq Er EBUSY
+Some or all of the pages in the specified region are locked and
+.Dv MS_INVALIDATE
+is specified.
+.It Bq Er EINVAL
+The
+.Fa addr
+argument
+is not a multiple of the hardware page size.
+.It Bq Er EINVAL
+The
+.Fa len
+argument
+is too large or negative.
+.It Bq Er EINVAL
+The
+.Fa flags
+argument
+was both MS_ASYNC and MS_INVALIDATE.
+Only one of these flags is allowed.
+.El
+.Sh SEE ALSO
+.Xr madvise 2 ,
+.Xr mincore 2 ,
+.Xr mlock 2 ,
+.Xr mprotect 2 ,
+.Xr munmap 2
+.Sh HISTORY
+The
+.Fn msync
+system call first appeared in
+.Bx 4.4 .
+.Sh BUGS
+The
+.Fn msync
+system call is obsolete since
+.Bx
+implements a coherent file system buffer cache.
+However, it may be used to associate dirty VM pages with file system
+buffers and thus cause them to be flushed to physical media sooner
+rather than later.
diff --git a/lib/libc/sys/munmap.2 b/lib/libc/sys/munmap.2
new file mode 100644
index 0000000..6431072
--- /dev/null
+++ b/lib/libc/sys/munmap.2
@@ -0,0 +1,78 @@
+.\" Copyright (c) 1991, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"	@(#)munmap.2	8.3 (Berkeley) 5/27/94
+.\" $FreeBSD$
+.\"
+.Dd May 27, 1994
+.Dt MUNMAP 2
+.Os
+.Sh NAME
+.Nm munmap
+.Nd remove a mapping
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In sys/mman.h
+.Ft int
+.Fn munmap "void *addr" "size_t len"
+.Sh DESCRIPTION
+The
+.Fn munmap
+system call
+deletes the mappings for the specified address range,
+and causes further references to addresses within the range
+to generate invalid memory references.
+.Sh RETURN VALUES
+.Rv -std munmap
+.Sh ERRORS
+The
+.Fn munmap
+system call
+will fail if:
+.Bl -tag -width Er
+.It Bq Er EINVAL
+The
+.Fa addr
+argument was not page aligned, the
+.Fa len
+argument was zero or negative, or
+some part of the region being unmapped is outside the
+valid address range for a process.
+.El
+.Sh "SEE ALSO"
+.Xr madvise 2 ,
+.Xr mincore 2 ,
+.Xr mmap 2 ,
+.Xr mprotect 2 ,
+.Xr msync 2 ,
+.Xr getpagesize 3
+.Sh HISTORY
+The
+.Fn munmap
+system call first appeared in
+.Bx 4.4 .
diff --git a/lib/libc/sys/nanosleep.2 b/lib/libc/sys/nanosleep.2
new file mode 100644
index 0000000..f50544b
--- /dev/null
+++ b/lib/libc/sys/nanosleep.2
@@ -0,0 +1,111 @@
+.\"	$OpenBSD: nanosleep.2,v 1.1 1997/04/20 20:56:20 tholo Exp $
+.\"	$NetBSD: nanosleep.2,v 1.1 1997/04/17 18:12:02 jtc Exp $
+.\"
+.\" Copyright (c) 1986, 1991, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"     @(#)sleep.3	8.1 (Berkeley) 6/4/93
+.\" $FreeBSD$
+.\"
+.Dd April 17, 1997
+.Dt NANOSLEEP 2
+.Os
+.Sh NAME
+.Nm nanosleep
+.Nd suspend process execution for an interval measured in nanoseconds
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In time.h
+.Ft int
+.Fn nanosleep "const struct timespec *rqtp" "struct timespec *rmtp"
+.Sh DESCRIPTION
+The
+.Fn nanosleep
+system call
+causes the calling thread to sleep until the time interval specified by
+.Fa rqtp
+has elapsed.
+An unmasked signal will
+cause it to terminate the sleep early, regardless of the
+.Dv SA_RESTART
+value on the interrupting signal.
+.Sh RETURN VALUES
+If the
+.Fn nanosleep
+system call returns because the requested time has elapsed, the value
+returned will be zero.
+.Pp
+If the
+.Fn nanosleep
+system call returns due to the delivery of a signal, the value returned
+will be -1, and the global variable
+.Va errno
+will be set to indicate the interruption.
+If
+.Fa rmtp
+is
+.No non- Ns Dv NULL ,
+the timespec structure it references is updated to contain the
+unslept amount (the request time minus the time actually slept).
+.Sh ERRORS
+The
+.Fn nanosleep
+system call fails if:
+.Bl -tag -width Er
+.It Bq Er EFAULT
+Either
+.Fa rqtp
+or
+.Fa rmtp
+points to memory that is not a valid part of the process
+address space.
+.It Bq Er EINTR
+The
+.Fn nanosleep
+system call
+was interrupted by the delivery of a signal.
+.It Bq Er EINVAL
+The
+.Fa rqtp
+argument
+specified a nanosecond value less than zero
+or greater than or equal to 1000 million.
+.It Bq Er ENOSYS
+The
+.Fn nanosleep
+system call
+is not supported by this implementation.
+.El
+.Sh SEE ALSO
+.Xr sigsuspend 2 ,
+.Xr sleep 3
+.Sh STANDARDS
+The
+.Fn nanosleep
+system call conforms to
+.St -p1003.1b-93 .
diff --git a/lib/libc/sys/nfssvc.2 b/lib/libc/sys/nfssvc.2
new file mode 100644
index 0000000..cf52187
--- /dev/null
+++ b/lib/libc/sys/nfssvc.2
@@ -0,0 +1,258 @@
+.\" Copyright (c) 1989, 1991, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"	@(#)nfssvc.2	8.1 (Berkeley) 6/9/93
+.\" $FreeBSD$
+.\"
+.Dd June 9, 1993
+.Dt NFSSVC 2
+.Os
+.Sh NAME
+.Nm nfssvc
+.Nd NFS services
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In sys/param.h
+.In sys/mount.h
+.In sys/time.h
+.In nfs/rpcv2.h
+.In nfsserver/nfs.h
+.In unistd.h
+.Ft int
+.Fn nfssvc "int flags" "void *argstructp"
+.Sh DESCRIPTION
+The
+.Fn nfssvc
+system call is used by the NFS daemons to pass information into and out
+of the kernel and also to enter the kernel as a server daemon.
+The
+.Fa flags
+argument consists of several bits that show what action is to be taken
+once in the kernel and the
+.Fa argstructp
+points to one of three structures depending on which bits are set in
+flags.
+.Pp
+On the client side,
+.Xr nfsiod 8
+calls
+.Fn nfssvc
+with the
+.Fa flags
+argument set to
+.Dv NFSSVC_BIOD
+and
+.Fa argstructp
+set to
+.Dv NULL
+to enter the kernel as a block I/O server daemon.
+For
+.Tn NQNFS ,
+.Xr mount_nfs 8
+calls
+.Fn nfssvc
+with the
+.Dv NFSSVC_MNTD
+flag, optionally or'd with the flags
+.Dv NFSSVC_GOTAUTH
+and
+.Dv NFSSVC_AUTHINFAIL
+along with a pointer to a
+.Bd -literal
+struct nfsd_cargs {
+	char		*ncd_dirp;	/* Mount dir path */
+	uid_t		ncd_authuid;	/* Effective uid */
+	int		ncd_authtype;	/* Type of authenticator */
+	int		ncd_authlen;	/* Length of authenticator string */
+	u_char		*ncd_authstr;	/* Authenticator string */
+	int		ncd_verflen;	/* and the verifier */
+	u_char		*ncd_verfstr;
+	NFSKERBKEY_T	ncd_key;	/* Session key */
+};
+.Ed
+.Pp
+structure.
+The initial call has only the
+.Dv NFSSVC_MNTD
+flag set to specify service for the mount point.
+If the mount point is using Kerberos, then the
+.Xr mount_nfs 8
+utility will return from
+.Fn nfssvc
+with
+.Va errno
+==
+.Er ENEEDAUTH
+whenever the client side requires an ``rcmd''
+authentication ticket for the user.
+The
+.Xr mount_nfs 8
+utility will attempt to get the Kerberos ticket, and if successful will call
+.Fn nfssvc
+with the flags
+.Dv NFSSVC_MNTD
+and
+.Dv NFSSVC_GOTAUTH
+after filling the ticket into the
+ncd_authstr field
+and
+setting the ncd_authlen and ncd_authtype
+fields of the nfsd_cargs structure.
+If
+.Xr mount_nfs 8
+failed to get the ticket,
+.Fn nfssvc
+will be called with the flags
+.Dv NFSSVC_MNTD ,
+.Dv NFSSVC_GOTAUTH
+and
+.Dv NFSSVC_AUTHINFAIL
+to denote a failed authentication attempt.
+.Pp
+On the server side,
+.Fn nfssvc
+is called with the flag
+.Dv NFSSVC_NFSD
+and a pointer to a
+.Bd -literal
+struct nfsd_srvargs {
+	struct nfsd	*nsd_nfsd;	/* Pointer to in kernel nfsd struct */
+	uid_t		nsd_uid;	/* Effective uid mapped to cred */
+	u_int32_t	nsd_haddr;	/* Ip address of client */
+	struct ucred	nsd_cr;		/* Cred. uid maps to */
+	int		nsd_authlen;	/* Length of auth string (ret) */
+	u_char		*nsd_authstr;	/* Auth string (ret) */
+	int		nsd_verflen;	/* and the verifier */
+	u_char		*nsd_verfstr;
+	struct timeval	nsd_timestamp;	/* timestamp from verifier */
+	u_int32_t	nsd_ttl;	/* credential ttl (sec) */
+	NFSKERBKEY_T	nsd_key;	/* Session key */
+};
+.Ed
+.Pp
+to enter the kernel as an
+.Xr nfsd 8
+daemon.
+Whenever an
+.Xr nfsd 8
+daemon receives a Kerberos authentication ticket, it will return from
+.Fn nfssvc
+with
+.Va errno
+==
+.Er ENEEDAUTH .
+The
+.Xr nfsd 8
+utility will attempt to authenticate the ticket and generate a set of credentials
+on the server for the ``user id'' specified in the field nsd_uid.
+This is done by first authenticating the Kerberos ticket and then mapping
+the Kerberos principal to a local name and getting a set of credentials for
+that user via
+.Xr getpwnam 3
+and
+.Xr getgrouplist 3 .
+If successful, the
+.Xr nfsd 8
+utility will call
+.Fn nfssvc
+with the
+.Dv NFSSVC_NFSD
+and
+.Dv NFSSVC_AUTHIN
+flags set to pass the credential mapping in nsd_cr into the
+kernel to be cached on the server socket for that client.
+If the authentication failed,
+.Xr nfsd 8
+calls
+.Fn nfssvc
+with the flags
+.Dv NFSSVC_NFSD
+and
+.Dv NFSSVC_AUTHINFAIL
+to denote an authentication failure.
+.Pp
+The master
+.Xr nfsd 8
+server daemon calls
+.Fn nfssvc
+with the flag
+.Dv NFSSVC_ADDSOCK
+and a pointer to a
+.Bd -literal
+struct nfsd_args {
+	int	sock;	/* Socket to serve */
+	caddr_t	name;	/* Client address for connection based sockets */
+	int	namelen;/* Length of name */
+};
+.Ed
+.Pp
+to pass a server side
+.Tn NFS
+socket into the kernel for servicing by the
+.Xr nfsd 8
+daemons.
+.Sh RETURN VALUES
+Normally
+.Fn nfssvc
+does not return unless the server
+is terminated by a signal when a value of 0 is returned.
+Otherwise, -1 is returned and the global variable
+.Va errno
+is set to specify the error.
+.Sh ERRORS
+.Bl -tag -width Er
+.It Bq Er ENEEDAUTH
+This special error value
+is really used for authentication support, particularly Kerberos,
+as explained above.
+.It Bq Er EPERM
+The caller is not the super-user.
+.El
+.Sh SEE ALSO
+.Xr mount_nfs 8 ,
+.Xr nfsd 8 ,
+.Xr nfsiod 8
+.Sh HISTORY
+The
+.Fn nfssvc
+system call first appeared in
+.Bx 4.4 .
+.Sh BUGS
+The
+.Fn nfssvc
+system call is designed specifically for the
+.Tn NFS
+support daemons and as such is specific to their requirements.
+It should really return values to indicate the need for authentication
+support, since
+.Er ENEEDAUTH
+is not really an error.
+Several fields of the argument structures are assumed to be valid and
+sometimes to be unchanged from a previous call, such that
+.Fn nfssvc
+must be used with extreme care.
diff --git a/lib/libc/sys/ntp_adjtime.2 b/lib/libc/sys/ntp_adjtime.2
new file mode 100644
index 0000000..8ce78e7
--- /dev/null
+++ b/lib/libc/sys/ntp_adjtime.2
@@ -0,0 +1,315 @@
+.\"	$NetBSD: ntp_adjtime.2,v 1.6 2003/04/16 13:34:55 wiz Exp $
+.\"
+.\" Copyright (c) 2001 The NetBSD Foundation, Inc.
+.\" All rights reserved.
+.\"
+.\" This code is derived from software contributed to The NetBSD Foundation
+.\" by Thomas Klausner.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd July 13, 2005
+.Dt NTP_ADJTIME 2
+.Os
+.Sh NAME
+.Nm ntp_adjtime ,
+.Nm ntp_gettime
+.Nd Network Time Protocol (NTP) daemon interface system calls
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In sys/timex.h
+.Ft int
+.Fn ntp_adjtime "struct timex *"
+.Ft int
+.Fn ntp_gettime "struct ntptimeval *"
+.Sh DESCRIPTION
+The two system calls
+.Fn ntp_adjtime
+and
+.Fn ntp_gettime
+are the kernel interface to the Network Time Protocol (NTP) daemon
+.Xr ntpd 8 .
+.Pp
+The
+.Fn ntp_adjtime
+function is used by the NTP daemon to adjust the system clock to an
+externally derived time.
+The time offset and related variables which are set by
+.Fn ntp_adjtime
+are used by
+.Fn hardclock
+to adjust the phase and frequency of the phase- or frequency-lock loop
+(PLL resp. FLL) which controls the system clock.
+.Pp
+The
+.Fn ntp_gettime
+function provides the time, maximum error (sync distance) and
+estimated error (dispersion) to client user application programs.
+.Pp
+In the following, all variables that refer PPS are only relevant if
+the
+.Em PPS_SYNC
+option is enabled in the kernel.
+.Pp
+.Fn ntp_adjtime
+has as argument a
+.Va struct timex *
+of the following form:
+.Bd -literal
+struct timex {
+	unsigned int modes;	/* clock mode bits (wo) */
+	long offset;		/* time offset (us) (rw) */
+	long freq;		/* frequency offset (scaled ppm) (rw) */
+	long maxerror;		/* maximum error (us) (rw) */
+	long esterror;		/* estimated error (us) (rw) */
+	int status;		/* clock status bits (rw) */
+	long constant;		/* pll time constant (rw) */
+	long precision;		/* clock precision (us) (ro) */
+	long tolerance;		/* clock frequency tolerance (scaled
+				 * ppm) (ro) */
+	/*
+	 * The following read-only structure members are implemented
+	 * only if the PPS signal discipline is configured in the
+	 * kernel.
+	 */
+	long ppsfreq;		/* pps frequency (scaled ppm) (ro) */
+	long jitter;		/* pps jitter (us) (ro) */
+	int shift;		/* interval duration (s) (shift) (ro) */
+	long stabil;		/* pps stability (scaled ppm) (ro) */
+	long jitcnt;		/* jitter limit exceeded (ro) */
+	long calcnt;		/* calibration intervals (ro) */
+	long errcnt;		/* calibration errors (ro) */
+	long stbcnt;		/* stability limit exceeded (ro) */
+};
+.Ed
+.Pp
+The members of this struct have the following meanings when used as
+argument for
+.Fn ntp_adjtime :
+.Bl -tag -width tolerance -compact
+.It Fa modes
+Defines what settings should be changed with the current
+.Fn ntp_adjtime
+call (write-only).
+Bitwise OR of the following:
+.Bl -tag -width MOD_TIMECONST -compact -offset indent
+.It MOD_OFFSET
+set time offset
+.It MOD_FREQUENCY
+set frequency offset
+.It MOD_MAXERROR
+set maximum time error
+.It MOD_ESTERROR
+set estimated time error
+.It MOD_STATUS
+set clock status bits
+.It MOD_TIMECONST
+set PLL time constant
+.It MOD_CLKA
+set clock A
+.It MOD_CLKB
+set clock B
+.El
+.It Fa offset
+Time offset (in microseconds), used by the PLL/FLL to adjust the
+system time in small increments (read-write).
+.It Fa freq
+Frequency offset (scaled ppm) (read-write).
+.It Fa maxerror
+Maximum error (in microseconds).
+Initialized by an
+.Fn ntp_adjtime
+call, and increased by the kernel once each second to reflect the maximum
+error bound growth (read-write).
+.It Fa esterror
+Estimated error (in microseconds).
+Set and read by
+.Fn ntp_adjtime ,
+but unused by the kernel (read-write).
+.It Fa status
+System clock status bits (read-write).
+Bitwise OR of the following:
+.Bl -tag -width STA_PPSJITTER -compact -offset indent
+.It STA_PLL
+Enable PLL updates (read-write).
+.It STA_PPSFREQ
+Enable PPS freq discipline (read-write).
+.It STA_PPSTIME
+Enable PPS time discipline (read-write).
+.It STA_FLL
+Select frequency-lock mode (read-write).
+.It STA_INS
+Insert leap (read-write).
+.It STA_DEL
+Delete leap (read-write).
+.It STA_UNSYNC
+Clock unsynchronized (read-write).
+.It STA_FREQHOLD
+Hold frequency (read-write).
+.It STA_PPSSIGNAL
+PPS signal present (read-only).
+.It STA_PPSJITTER
+PPS signal jitter exceeded (read-only).
+.It STA_PPSWANDER
+PPS signal wander exceeded (read-only).
+.It STA_PPSERROR
+PPS signal calibration error (read-only).
+.It STA_CLOCKERR
+Clock hardware fault (read-only).
+.El
+.It Fa constant
+PLL time constant, determines the bandwidth, or
+.Dq stiffness ,
+of the PLL (read-write).
+.It Fa precision
+Clock precision (in microseconds).
+In most cases the same as the kernel tick variable (see
+.Xr hz 9 ) .
+If a precision clock counter or external time-keeping signal is available,
+it could be much lower (and depend on the state of the signal)
+(read-only).
+.It Fa tolerance
+Maximum frequency error, or tolerance of the CPU clock oscillator (scaled
+ppm).
+Ordinarily a property of the architecture, but could change under
+the influence of external time-keeping signals (read-only).
+.It Fa ppsfreq
+PPS frequency offset produced by the frequency median filter (scaled
+ppm) (read-only).
+.It Fa jitter
+PPS jitter measured by the time median filter in microseconds
+(read-only).
+.It Fa shift
+Logarithm to base 2 of the interval duration in seconds (PPS,
+read-only).
+.It Fa stabil
+PPS stability (scaled ppm); dispersion (wander) measured by the
+frequency median filter (read-only).
+.It Fa jitcnt
+Number of seconds that have been discarded because the jitter measured
+by the time median filter exceeded the limit
+.Em MAXTIME
+(PPS, read-only).
+.It Fa calcnt
+Count of calibration intervals (PPS, read-only).
+.It Fa errcnt
+Number of calibration intervals that have been discarded because the
+wander exceeded the limit
+.Em MAXFREQ
+or where the calibration interval jitter exceeded two ticks (PPS,
+read-only).
+.It Fa stbcnt
+Number of calibration intervals that have been discarded because the
+frequency wander exceeded the limit
+.Em MAXFREQ Ns /4
+(PPS, read-only).
+.El
+After the
+.Fn ntp_adjtime
+call, the
+.Va struct timex *
+structure contains the current values of the corresponding variables.
+.Pp
+.Fn ntp_gettime
+has as argument a
+.Va struct ntptimeval *
+with the following members:
+.Bd -literal
+struct ntptimeval {
+	struct timeval time;	/* current time (ro) */
+	long maxerror;		/* maximum error (us) (ro) */
+	long esterror;		/* estimated error (us) (ro) */
+};
+.Ed
+.Pp
+These have the following meaning:
+.Bl -tag -width tolerance -compact
+.It Fa time
+Current time (read-only).
+.It Fa maxerror
+Maximum error in microseconds (read-only).
+.It Fa esterror
+Estimated error in microseconds (read-only).
+.El
+.Sh RETURN VALUES
+.Fn ntp_adjtime
+and
+.Fn ntp_gettime
+return the current state of the clock on success, or any of the errors
+of
+.Xr copyin 9
+and
+.Xr copyout 9 .
+.Fn ntp_adjtime
+may additionally return
+.Er EPERM
+if the user calling
+.Fn ntp_adjtime
+does not have sufficient permissions.
+.Pp
+Possible states of the clock are:
+.Bl -tag -width TIME_ERROR -compact -offset indent
+.It TIME_OK
+Everything okay, no leap second warning.
+.It TIME_INS
+.Dq insert leap second
+warning.
+At the end of the day, a leap second will be inserted after 23:59:59.
+.It TIME_DEL
+.Dq delete leap second
+warning.
+At the end of the day, second 23:59:59 will be skipped.
+.It TIME_OOP
+Leap second in progress.
+.It TIME_WAIT
+Leap second has occurred within the last few seconds.
+.It TIME_ERROR
+Clock not synchronized.
+.El
+.Sh ERRORS
+The
+.Fn ntp_adjtime
+system call may return
+.Er EPERM
+if the caller
+does not have sufficient permissions.
+.Sh SEE ALSO
+.Xr options 4 ,
+.Xr ntpd 8 ,
+.Xr hardclock 9 ,
+.Xr hz 9
+.Bl -tag -width indent
+.It Pa http://www.bipm.fr/enus/5_Scientific/c_time/time_1.html
+.It Pa http://www.boulder.nist.gov/timefreq/general/faq.htm
+.It Pa ftp://time.nist.gov/pub/leap-seconds.list
+.El
+.Sh BUGS
+Take note that this
+.Tn API
+is extremely complex and stateful.
+Users should not attempt modification without first
+reviewing the
+.Xr ntpd 8
+sources in depth.
diff --git a/lib/libc/sys/open.2 b/lib/libc/sys/open.2
new file mode 100644
index 0000000..deca8bc
--- /dev/null
+++ b/lib/libc/sys/open.2
@@ -0,0 +1,462 @@
+.\" Copyright (c) 1980, 1991, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"     @(#)open.2	8.2 (Berkeley) 11/16/93
+.\" $FreeBSD$
+.\"
+.Dd February 28, 2009
+.Dt OPEN 2
+.Os
+.Sh NAME
+.Nm open , openat
+.Nd open or create a file for reading, writing or executing
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In fcntl.h
+.Ft int
+.Fn open "const char *path" "int flags" "..."
+.Ft int
+.Fn openat "int fd" "const char *path" "int flags" "..."
+.Sh DESCRIPTION
+The file name specified by
+.Fa path
+is opened
+for either execution or reading and/or writing as specified by the
+argument
+.Fa flags
+and the file descriptor returned to the calling process.
+The
+.Fa flags
+argument may indicate the file is to be
+created if it does not exist (by specifying the
+.Dv O_CREAT
+flag).
+In this case
+.Fn open
+and
+.Fn openat
+require an additional argument
+.Fa "mode_t mode" ,
+and the file is created with mode
+.Fa mode
+as described in
+.Xr chmod 2
+and modified by the process' umask value (see
+.Xr umask 2 ) .
+.Pp
+The
+.Fn openat
+function is equivalent to the
+.Fn open
+function except in the case where the
+.Fa path
+specifies a relative path.
+In this case the file to be opened is determined relative to the directory
+associated with the file descriptor
+.Fa fd
+instead of the current working directory.
+The
+.Fa flag
+parameter and the optional fourth parameter correspond exactly to
+the parameters of
+.Fn open .
+If
+.Fn openat
+is passed the special value
+.Dv AT_FDCWD
+in the
+.Fa fd
+parameter, the current working directory is used
+and the behavior is identical to a call to
+.Fn open .
+.Pp
+The flags specified are formed by
+.Em or Ns 'ing
+the following values
+.Pp
+.Bd -literal -offset indent -compact
+O_RDONLY	open for reading only
+O_WRONLY	open for writing only
+O_RDWR		open for reading and writing
+O_EXEC		open for execute only
+O_NONBLOCK	do not block on open
+O_APPEND	append on each write
+O_CREAT		create file if it does not exist
+O_TRUNC		truncate size to 0
+O_EXCL		error if create and file exists
+O_SHLOCK	atomically obtain a shared lock
+O_EXLOCK	atomically obtain an exclusive lock
+O_DIRECT	eliminate or reduce cache effects
+O_FSYNC		synchronous writes
+O_SYNC		synchronous writes
+O_NOFOLLOW	do not follow symlinks
+O_NOCTTY	don't assign controlling terminal
+O_TTY_INIT	restore default terminal attributes
+O_DIRECTORY	error if file is not a directory
+.Ed
+.Pp
+Opening a file with
+.Dv O_APPEND
+set causes each write on the file
+to be appended to the end.
+If
+.Dv O_TRUNC
+is specified and the
+file exists, the file is truncated to zero length.
+If
+.Dv O_EXCL
+is set with
+.Dv O_CREAT
+and the file already
+exists,
+.Fn open
+returns an error.
+This may be used to
+implement a simple exclusive access locking mechanism.
+If
+.Dv O_EXCL
+is set and the last component of the pathname is
+a symbolic link,
+.Fn open
+will fail even if the symbolic
+link points to a non-existent name.
+If the
+.Dv O_NONBLOCK
+flag is specified and the
+.Fn open
+system call would result
+in the process being blocked for some reason (e.g., waiting for
+carrier on a dialup line),
+.Fn open
+returns immediately.
+The descriptor remains in non-blocking mode for subsequent operations.
+.Pp
+If
+.Dv O_FSYNC
+is used in the mask, all writes will
+immediately be written to disk,
+the kernel will not cache written data
+and all writes on the descriptor will not return until
+the data to be written completes.
+.Pp
+.Dv O_SYNC
+is a synonym for
+.Dv O_FSYNC
+required by
+.Tn POSIX .
+.Pp
+If
+.Dv O_NOFOLLOW
+is used in the mask and the target file passed to
+.Fn open
+is a symbolic link then the
+.Fn open
+will fail.
+.Pp
+When opening a file, a lock with
+.Xr flock 2
+semantics can be obtained by setting
+.Dv O_SHLOCK
+for a shared lock, or
+.Dv O_EXLOCK
+for an exclusive lock.
+If creating a file with
+.Dv O_CREAT ,
+the request for the lock will never fail
+(provided that the underlying file system supports locking).
+.Pp
+.Dv O_DIRECT
+may be used to minimize or eliminate the cache effects of reading and writing.
+The system will attempt to avoid caching the data you read or write.
+If it cannot avoid caching the data,
+it will minimize the impact the data has on the cache.
+Use of this flag can drastically reduce performance if not used with care.
+.Pp
+.Dv O_NOCTTY
+may be used to ensure the OS does not assign this file as the
+controlling terminal when it opens a tty device.
+This is the default on
+.Fx ,
+but is present for
+.Tn POSIX
+compatibility.
+The
+.Fn open
+system call will not assign controlling terminals on
+.Fx .
+.Pp
+.Dv O_TTY_INIT
+may be used to ensure the OS restores the terminal attributes when
+initially opening a TTY.
+This is the default on
+.Fx ,
+but is present for
+.Tn POSIX
+compatibility.
+The initial call to
+.Fn open
+on a TTY will always restore default terminal attributes on
+.Fx .
+.Pp
+.Dv O_DIRECTORY
+may be used to ensure the resulting file descriptor refers to a
+directory.
+This flag can be used to prevent applications with elevated privileges
+from opening files which are even unsafe to open with
+.Dv O_RDONLY ,
+such as device nodes.
+.Pp
+If successful,
+.Fn open
+returns a non-negative integer, termed a file descriptor.
+It returns \-1 on failure.
+The file pointer used to mark the current position within the
+file is set to the beginning of the file.
+.Pp
+When a new file is created it is given the group of the directory
+which contains it.
+.Pp
+The new descriptor is set to remain open across
+.Xr execve 2
+system calls; see
+.Xr close 2
+and
+.Xr fcntl 2 .
+.Pp
+The system imposes a limit on the number of file descriptors
+open simultaneously by one process.
+The
+.Xr getdtablesize 2
+system call returns the current system limit.
+.Sh RETURN VALUES
+If successful,
+.Fn open
+and
+.Fn openat
+return a non-negative integer, termed a file descriptor.
+They return \-1 on failure, and set
+.Va errno
+to indicate the error.
+.Sh ERRORS
+The named file is opened unless:
+.Bl -tag -width Er
+.It Bq Er ENOTDIR
+A component of the path prefix is not a directory.
+.It Bq Er ENAMETOOLONG
+A component of a pathname exceeded 255 characters,
+or an entire path name exceeded 1023 characters.
+.It Bq Er ENOENT
+.Dv O_CREAT
+is not set and the named file does not exist.
+.It Bq Er ENOENT
+A component of the path name that must exist does not exist.
+.It Bq Er EACCES
+Search permission is denied for a component of the path prefix.
+.It Bq Er EACCES
+The required permissions (for reading and/or writing)
+are denied for the given flags.
+.It Bq Er EACCES
+.Dv O_TRUNC
+is specified and write permission is denied.
+.It Bq Er EACCES
+.Dv O_CREAT
+is specified,
+the file does not exist,
+and the directory in which it is to be created
+does not permit writing.
+.It Bq Er EPERM
+.Dv O_CREAT
+is specified, the file does not exist, and the directory in which it is to be
+created has its immutable flag set, see the
+.Xr chflags 2
+manual page for more information.
+.It Bq Er EPERM
+The named file has its immutable flag set and the file is to be modified.
+.It Bq Er EPERM
+The named file has its append-only flag set, the file is to be modified, and
+.Dv O_TRUNC
+is specified or
+.Dv O_APPEND
+is not specified.
+.It Bq Er ELOOP
+Too many symbolic links were encountered in translating the pathname.
+.It Bq Er EISDIR
+The named file is a directory, and the arguments specify
+it is to be modified.
+.It Bq Er EROFS
+The named file resides on a read-only file system,
+and the file is to be modified.
+.It Bq Er EROFS
+.Dv O_CREAT
+is specified and the named file would reside on a read-only file system.
+.It Bq Er EMFILE
+The process has already reached its limit for open file descriptors.
+.It Bq Er ENFILE
+The system file table is full.
+.It Bq Er EMLINK
+.Dv O_NOFOLLOW
+was specified and the target is a symbolic link.
+.It Bq Er ENXIO
+The named file is a character special or block
+special file, and the device associated with this special file
+does not exist.
+.It Bq Er ENXIO
+.Dv O_NONBLOCK
+is set, the named file is a fifo,
+.Dv O_WRONLY
+is set, and no process has the file open for reading.
+.It Bq Er EINTR
+The
+.Fn open
+operation was interrupted by a signal.
+.It Bq Er EOPNOTSUPP
+.Dv O_SHLOCK
+or
+.Dv O_EXLOCK
+is specified but the underlying file system does not support locking.
+.It Bq Er EOPNOTSUPP
+The named file is a special file mounted through a file system that
+does not support access to it (e.g.\& NFS).
+.It Bq Er EWOULDBLOCK
+.Dv O_NONBLOCK
+and one of
+.Dv O_SHLOCK
+or
+.Dv O_EXLOCK
+is specified and the file is locked.
+.It Bq Er ENOSPC
+.Dv O_CREAT
+is specified,
+the file does not exist,
+and the directory in which the entry for the new file is being placed
+cannot be extended because there is no space left on the file
+system containing the directory.
+.It Bq Er ENOSPC
+.Dv O_CREAT
+is specified,
+the file does not exist,
+and there are no free inodes on the file system on which the
+file is being created.
+.It Bq Er EDQUOT
+.Dv O_CREAT
+is specified,
+the file does not exist,
+and the directory in which the entry for the new file
+is being placed cannot be extended because the
+user's quota of disk blocks on the file system
+containing the directory has been exhausted.
+.It Bq Er EDQUOT
+.Dv O_CREAT
+is specified,
+the file does not exist,
+and the user's quota of inodes on the file system on
+which the file is being created has been exhausted.
+.It Bq Er EIO
+An I/O error occurred while making the directory entry or
+allocating the inode for
+.Dv O_CREAT .
+.It Bq Er ETXTBSY
+The file is a pure procedure (shared text) file that is being
+executed and the
+.Fn open
+system call requests write access.
+.It Bq Er EFAULT
+The
+.Fa path
+argument
+points outside the process's allocated address space.
+.It Bq Er EEXIST
+.Dv O_CREAT
+and
+.Dv O_EXCL
+were specified and the file exists.
+.It Bq Er EOPNOTSUPP
+An attempt was made to open a socket (not currently implemented).
+.It Bq Er EINVAL
+An attempt was made to open a descriptor with an illegal combination
+of
+.Dv O_RDONLY ,
+.Dv O_WRONLY ,
+.Dv O_RDWR
+and
+.Dv O_EXEC.
+.It Bq Eq EBADF
+The
+.Fa path
+argument does not specify an absolute path and the
+.Fa fd
+argument is
+neither
+.Dv AT_FDCWD
+nor a valid file descriptor open for searching.
+.It Bq Eq ENOTDIR
+The
+.Fa path
+argument is not an absolute path and
+.Fa fd
+is neither
+.Dv AT_FDCWD
+nor a file descriptor associated with a directory.
+.It Bq Eq ENOTDIR
+.Dv O_DIRECTORY
+is specified and the file is not a directory.
+.El
+.Sh SEE ALSO
+.Xr chmod 2 ,
+.Xr close 2 ,
+.Xr dup 2 ,
+.Xr fexecve 2 ,
+.Xr fhopen 2 ,
+.Xr getdtablesize 2 ,
+.Xr getfh 2 ,
+.Xr lgetfh 2 ,
+.Xr lseek 2 ,
+.Xr read 2 ,
+.Xr umask 2 ,
+.Xr write 2 ,
+.Xr fopen 3
+.Sh HISTORY
+The
+.Fn open
+function appeared in
+.At v6 .
+The
+.Fn openat
+function was introduced in
+.Fx 8.0 .
+.Sh BUGS
+The Open Group Extended API Set 2 specification requires that the test
+for whether
+.Fa fd
+is searchable is based on whether
+.Fa fd
+is open for searching, not whether the underlying directory currently
+permits searches.
+The present implementation of the
+.Fa openat
+checks the current permissions of directory instead.
diff --git a/lib/libc/sys/pathconf.2 b/lib/libc/sys/pathconf.2
new file mode 100644
index 0000000..495bc65
--- /dev/null
+++ b/lib/libc/sys/pathconf.2
@@ -0,0 +1,263 @@
+.\" Copyright (c) 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"	@(#)pathconf.2	8.1 (Berkeley) 6/4/93
+.\" $FreeBSD$
+.\"
+.Dd July 7, 2009
+.Dt PATHCONF 2
+.Os
+.Sh NAME
+.Nm pathconf ,
+.Nm lpathconf ,
+.Nm fpathconf
+.Nd get configurable pathname variables
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In unistd.h
+.Ft long
+.Fn pathconf "const char *path" "int name"
+.Ft long
+.Fn lpathconf "const char *path" "int name"
+.Ft long
+.Fn fpathconf "int fd" "int name"
+.Sh DESCRIPTION
+The
+.Fn pathconf ,
+.Fn lpathconf
+and
+.Fn fpathconf
+system calls provide a method for applications to determine the current
+value of a configurable system limit or option variable associated
+with a pathname or file descriptor.
+.Pp
+For
+.Fn pathconf
+and
+.Fn lpathconf ,
+the
+.Fa path
+argument is the name of a file or directory.
+For
+.Fn fpathconf ,
+the
+.Fa fd
+argument is an open file descriptor.
+The
+.Fa name
+argument specifies the system variable to be queried.
+Symbolic constants for each name value are found in the include file
+.Li <unistd.h> .
+.Pp
+The
+.Fn lpathconf
+system call is like
+.Fn pathconf
+except in the case where the named file is a symbolic link,
+in which case
+.Fn lpathconf
+returns information about the link,
+while
+.Fn pathconf
+returns information about the file the link references.
+.Pp
+The available values are as follows:
+.Pp
+.Bl -tag -width 6n
+.Pp
+.It Li _PC_LINK_MAX
+The maximum file link count.
+.It Li _PC_MAX_CANON
+The maximum number of bytes in terminal canonical input line.
+.It Li _PC_MAX_INPUT
+The minimum maximum number of bytes for which space is available in
+a terminal input queue.
+.It Li _PC_NAME_MAX
+The maximum number of bytes in a file name.
+.It Li _PC_PATH_MAX
+The maximum number of bytes in a pathname.
+.It Li _PC_PIPE_BUF
+The maximum number of bytes which will be written atomically to a pipe.
+.It Li _PC_CHOWN_RESTRICTED
+Return 1 if appropriate privilege is required for the
+.Xr chown 2
+system call, otherwise 0.
+.St -p1003.1-2001
+requires appropriate privilege in all cases, but this behavior was optional
+in prior editions of the standard.
+.It Li _PC_NO_TRUNC
+Return greater than zero if attempts to use pathname components longer than
+.Brq Dv NAME_MAX
+will result in an
+.Bq Er ENAMETOOLONG
+error; otherwise, such components will be truncated to
+.Brq Dv NAME_MAX .
+.St -p1003.1-2001
+requires the error in all cases, but this behavior was optional in prior
+editions of the standard, and some
+.No non- Ns Tn POSIX Ns -compliant
+file systems do not support this behavior.
+.It Li _PC_VDISABLE
+Returns the terminal character disabling value.
+.It Li _PC_ASYNC_IO
+Return 1 if asynchronous I/O is supported, otherwise 0.
+.It Li _PC_PRIO_IO
+Returns 1 if prioritised I/O is supported for this file,
+otherwise 0.
+.It Li _PC_SYNC_IO
+Returns 1 if synchronised I/O is supported for this file, otherwise 0.
+.It Li _PC_ALLOC_SIZE_MIN
+Minimum number of bytes of storage allocated for any portion of a file.
+.It Li _PC_FILESIZEBITS
+Number of bits needed to represent the maximum file size.
+.It Li _PC_REC_INCR_XFER_SIZE
+Recommended increment for file transfer sizes between
+.Dv _PC_REC_MIN_XFER_SIZE
+and
+.Dv _PC_REC_MAX_XFER_SIZE .
+.It Li _PC_REC_MAX_XFER_SIZE
+Maximum recommended file transfer size.
+.It Li _PC_REC_MIN_XFER_SIZE
+Minimum recommended file transfer size.
+.It Li _PC_REC_XFER_ALIGN
+Recommended file transfer buffer alignment.
+.It Li _PC_SYMLINK_MAX
+Maximum number of bytes in a symbolic link.
+.It Li _PC_ACL_EXTENDED
+Returns 1 if an Access Control List (ACL) can be set on the specified
+file, otherwise 0.
+.It Li _PC_ACL_NFS4
+Returns 1 if an NFSv4 ACLs can be set on the specified
+file, otherwise 0.
+.It Li _PC_ACL_PATH_MAX
+Maximum number of ACL entries per file.
+.It Li _PC_CAP_PRESENT
+Returns 1 if a capability state can be set on the specified file,
+otherwise 0.
+.It Li _PC_INF_PRESENT
+Returns 1 if an information label can be set on the specified file,
+otherwise 0.
+.It Li _PC_MAC_PRESENT
+Returns 1 if a Mandatory Access Control (MAC) label can be set on the
+specified file, otherwise 0.
+.It Li _PC_MIN_HOLE_SIZE
+If a file system supports the reporting of holes (see
+.Xr lseek 2 ,
+.Fn pathconf
+and
+.Fn fpathconf
+return a positive number that represents the minimum hole size returned in
+bytes.
+The offsets of holes returned will be aligned to this same value.
+A special value of 1 is returned if the file system does not specify the minimum
+hole size but still reports holes.  
+.El
+.Sh RETURN VALUES
+If the call to
+.Fn pathconf
+or
+.Fn fpathconf
+is not successful, \-1 is returned and
+.Va errno
+is set appropriately.
+Otherwise, if the variable is associated with functionality that does
+not have a limit in the system, \-1 is returned and
+.Va errno
+is not modified.
+Otherwise, the current variable value is returned.
+.Sh ERRORS
+If any of the following conditions occur, the
+.Fn pathconf
+and
+.Fn fpathconf
+system calls shall return -1 and set
+.Va errno
+to the corresponding value.
+.Bl -tag -width Er
+.It Bq Er EINVAL
+The value of the
+.Fa name
+argument is invalid.
+.It Bq Er EINVAL
+The implementation does not support an association of the variable
+name with the associated file.
+.El
+.Pp
+The
+.Fn pathconf
+system call
+will fail if:
+.Bl -tag -width Er
+.It Bq Er ENOTDIR
+A component of the path prefix is not a directory.
+.It Bq Er ENAMETOOLONG
+A component of a pathname exceeded
+.Brq Dv NAME_MAX
+characters (but see
+.Dv _PC_NO_TRUNC
+above),
+or an entire path name exceeded
+.Brq Dv PATH_MAX
+characters.
+.It Bq Er ENOENT
+The named file does not exist.
+.It Bq Er EACCES
+Search permission is denied for a component of the path prefix.
+.It Bq Er ELOOP
+Too many symbolic links were encountered in translating the pathname.
+.It Bq Er EIO
+An I/O error occurred while reading from or writing to the file system.
+.El
+.Pp
+.Bl -tag -width Er
+The
+.Fn fpathconf
+system call
+will fail if:
+.It Bq Er EBADF
+The
+.Fa fd
+argument
+is not a valid open file descriptor.
+.It Bq Er EIO
+An I/O error occurred while reading from or writing to the file system.
+.El
+.Sh SEE ALSO
+.Xr lseek 2 ,
+.Xr sysctl 3
+.Sh HISTORY
+The
+.Fn pathconf
+and
+.Fn fpathconf
+system calls first appeared in
+.Bx 4.4 .
+The
+.Fn lpathconf
+system call first appeared in
+.Fx 8.0 .
diff --git a/lib/libc/sys/pipe.2 b/lib/libc/sys/pipe.2
new file mode 100644
index 0000000..92d137f
--- /dev/null
+++ b/lib/libc/sys/pipe.2
@@ -0,0 +1,113 @@
+.\" Copyright (c) 1980, 1991, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"     @(#)pipe.2	8.1 (Berkeley) 6/4/93
+.\" $FreeBSD$
+.\"
+.Dd January 30, 2006
+.Dt PIPE 2
+.Os
+.Sh NAME
+.Nm pipe
+.Nd create descriptor pair for interprocess communication
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In unistd.h
+.Ft int
+.Fn pipe "int fildes[2]"
+.Sh DESCRIPTION
+The
+.Fn pipe
+system call
+creates a
+.Em pipe ,
+which is an object allowing
+bidirectional data flow,
+and allocates a pair of file descriptors.
+.Pp
+By convention, the first descriptor is normally used as the
+.Em read end
+of the pipe,
+and the second is normally the
+.Em write end ,
+so that data written to
+.Fa fildes[1]
+appears on (i.e., can be read from)
+.Fa fildes[0] .
+This allows the output of one program to be
+sent
+to another program:
+the source's standard output is set up to be
+the write end of the pipe,
+and the sink's standard input is set up to be
+the read end of the pipe.
+The pipe itself persists until all its associated descriptors are
+closed.
+.Pp
+A pipe that has had an end closed is considered
+.Em widowed .
+Writing on such a pipe causes the writing process to receive
+a
+.Dv SIGPIPE
+signal.
+Widowing a pipe is the only way to deliver end-of-file to a reader:
+after the reader consumes any buffered data, reading a widowed pipe
+returns a zero count.
+.Pp
+The bidirectional nature of this implementation of pipes is not
+portable to older systems, so it is recommended to use the convention
+for using the endpoints in the traditional manner when using a
+pipe in one direction.
+.Sh RETURN VALUES
+.Rv -std pipe
+.Sh ERRORS
+The
+.Fn pipe
+system call will fail if:
+.Bl -tag -width Er
+.It Bq Er EMFILE
+Too many descriptors are active.
+.It Bq Er ENFILE
+The system file table is full.
+.It Bq Er ENOMEM
+Not enough kernel memory to establish a pipe.
+.El
+.Sh SEE ALSO
+.Xr sh 1 ,
+.Xr fork 2 ,
+.Xr read 2 ,
+.Xr socketpair 2 ,
+.Xr write 2
+.Sh HISTORY
+The
+.Fn pipe
+function appeared in
+.At v3 .
+.Pp
+Bidirectional pipes were first used on
+.At V.4 .
diff --git a/lib/libc/sys/poll.2 b/lib/libc/sys/poll.2
new file mode 100644
index 0000000..932186d
--- /dev/null
+++ b/lib/libc/sys/poll.2
@@ -0,0 +1,213 @@
+.\"	$NetBSD: poll.2,v 1.3 1996/09/07 21:53:08 mycroft Exp $
+.\" $FreeBSD$
+.\"
+.\" Copyright (c) 1996 Charles M. Hannum.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 3. All advertising materials mentioning features or use of this software
+.\"    must display the following acknowledgement:
+.\"	This product includes software developed by Charles M. Hannum.
+.\" 4. The name of the author may not be used to endorse or promote products
+.\"    derived from this software without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+.\"
+.Dd July 8, 2002
+.Dt POLL 2
+.Os
+.Sh NAME
+.Nm poll
+.Nd synchronous I/O multiplexing
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In poll.h
+.Ft int
+.Fn poll "struct pollfd fds[]" "nfds_t nfds" "int timeout"
+.Sh DESCRIPTION
+The
+.Fn poll
+system call
+examines a set of file descriptors to see if some of them are ready for
+I/O.
+The
+.Fa fds
+argument is a pointer to an array of pollfd structures as defined in
+.In poll.h
+(shown below).
+The
+.Fa nfds
+argument determines the size of the
+.Fa fds
+array.
+.Bd -literal
+struct pollfd {
+    int    fd;       /* file descriptor */
+    short  events;   /* events to look for */
+    short  revents;  /* events returned */
+};
+.Ed
+.Pp
+The fields of
+.Fa struct pollfd
+are as follows:
+.Bl -tag -width XXXrevents
+.It fd
+File descriptor to poll.
+If fd is equal to -1 then
+.Fa revents
+is cleared (set to zero), and that pollfd is not checked.
+.It events
+Events to poll for.
+(See below.)
+.It revents
+Events which may occur.
+(See below.)
+.El
+.Pp
+The event bitmasks in
+.Fa events
+and
+.Fa revents
+have the following bits:
+.Bl -tag -width XXXPOLLWRNORM
+.It POLLIN
+Data other than high priority data may be read without blocking.
+.It POLLRDNORM
+Normal data may be read without blocking.
+.It POLLRDBAND
+Data with a non-zero priority may be read without blocking.
+.It POLLPRI
+High priority data may be read without blocking.
+.It POLLOUT
+.It POLLWRNORM
+Normal data may be written without blocking.
+.It POLLWRBAND
+Data with a non-zero priority may be written without blocking.
+.It POLLERR
+An exceptional condition has occurred on the device or socket.
+This
+flag is always checked, even if not present in the
+.Fa events
+bitmask.
+.It POLLHUP
+The device or socket has been disconnected.
+This flag is always
+checked, even if not present in the
+.Fa events
+bitmask.
+Note that
+POLLHUP
+and
+POLLOUT
+should never be present in the
+.Fa revents
+bitmask at the same time.
+.It POLLNVAL
+The file descriptor is not open.
+This flag is always checked, even
+if not present in the
+.Fa events
+bitmask.
+.El
+.Pp
+If
+.Fa timeout
+is neither zero nor INFTIM (-1), it specifies a maximum interval to
+wait for any file descriptor to become ready, in milliseconds.
+If
+.Fa timeout
+is INFTIM (-1), the poll blocks indefinitely.
+If
+.Fa timeout
+is zero, then
+.Fn poll
+will return without blocking.
+.Sh RETURN VALUES
+The
+.Fn poll
+system call
+returns the number of descriptors that are ready for I/O, or -1 if an
+error occurred.
+If the time limit expires,
+.Fn poll
+returns 0.
+If
+.Fn poll
+returns with an error,
+including one due to an interrupted system call,
+the
+.Fa fds
+array will be unmodified.
+.Sh COMPATIBILITY
+This implementation differs from the historical one in that a given
+file descriptor may not cause
+.Fn poll
+to return with an error.
+In cases where this would have happened in
+the historical implementation (e.g.\& trying to poll a
+.Xr revoke 2 Ns ed
+descriptor), this implementation instead copies the
+.Fa events
+bitmask to the
+.Fa revents
+bitmask.
+Attempting to perform I/O on this descriptor will then
+return an error.
+This behaviour is believed to be more useful.
+.Sh ERRORS
+An error return from
+.Fn poll
+indicates:
+.Bl -tag -width Er
+.It Bq Er EFAULT
+The
+.Fa fds
+argument
+points outside the process's allocated address space.
+.It Bq Er EINTR
+A signal was delivered before the time limit expired and
+before any of the selected events occurred.
+.It Bq Er EINVAL
+The specified time limit is negative.
+.El
+.Sh SEE ALSO
+.Xr accept 2 ,
+.Xr connect 2 ,
+.Xr kqueue 2 ,
+.Xr read 2 ,
+.Xr recv 2 ,
+.Xr select 2 ,
+.Xr send 2 ,
+.Xr write 2
+.Sh HISTORY
+The
+.Fn poll
+function appeared in
+.At V .
+This manual page and the core of the implementation was taken from
+.Nx .
+.Sh BUGS
+The distinction between some of the fields in the
+.Fa events
+and
+.Fa revents
+bitmasks is really not useful without STREAMS.
+The fields are
+defined for compatibility with existing software.
diff --git a/lib/libc/sys/posix_openpt.2 b/lib/libc/sys/posix_openpt.2
new file mode 100644
index 0000000..2633847
--- /dev/null
+++ b/lib/libc/sys/posix_openpt.2
@@ -0,0 +1,135 @@
+.\" Copyright (c) 2008 Ed Schouten <ed@FreeBSD.org>
+.\" All rights reserved.
+.\"
+.\" Portions of this software were developed under sponsorship from Snow
+.\" B.V., the Netherlands.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\" Portions of this text are reprinted and reproduced in electronic form
+.\" from IEEE Std 1003.1, 2004 Edition, Standard for Information Technology --
+.\" Portable Operating System Interface (POSIX), The Open Group Base
+.\" Specifications Issue 6, Copyright (C) 2001-2004 by the Institute of
+.\" Electrical and Electronics Engineers, Inc and The Open Group.  In the
+.\" event of any discrepancy between this version and the original IEEE and
+.\" The Open Group Standard, the original IEEE and The Open Group Standard is
+.\" the referee document.  The original Standard can be obtained online at
+.\"	http://www.opengroup.org/unix/online.html.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd August 20, 2008
+.Dt POSIX_OPENPT 2
+.Os
+.Sh NAME
+.Nm posix_openpt
+.Nd "open a pseudo-terminal device"
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In stdlib.h
+.In fcntl.h
+.Ft int
+.Fn posix_openpt "int oflag"
+.Sh DESCRIPTION
+The
+.Fn posix_openpt
+function allocates a new pseudo-terminal and establishes a connection
+with its master device.
+A slave device shall be created in
+.Pa /dev/pts .
+After the pseudo-terminal has been allocated, the slave device should
+have the proper permissions before it can be used (see
+.Xr grantpt 3 ) .
+The name of the slave device can be determined by calling
+.Xr ptsname 3 .
+.Pp
+The file status flags and file access modes of the open file description
+shall be set according to the value of
+.Fa oflag .
+Values for
+.Fa oflag
+are constructed by a bitwise-inclusive OR of flags from the following
+list, defined in
+.In fcntl.h :
+.Bl -tag -width ".Dv O_NOCTTY"
+.It Dv O_RDWR
+Open for reading and writing.
+.It Dv O_NOCTTY
+If set
+.Fn posix_openpt
+shall not cause the terminal device to become the controlling terminal
+for the process.
+.El
+.Pp
+The
+.Fn posix_openpt
+function shall fail when
+.Fa oflag
+contains other values.
+.Sh RETURN VALUES
+Upon successful completion, the
+.Fn posix_openpt
+function shall allocate a new pseudo-terminal device and return a
+non-negative integer representing a file descriptor, which is connected
+to its master device.
+Otherwise, -1 shall be returned and errno set to indicate the error.
+.Sh ERRORS
+The
+.Fn posix_openpt
+function shall fail if:
+.Bl -tag -width Er
+.It Bq Er ENFILE
+The system file table is full.
+.It Bq Er EINVAL
+The value of
+.Fa oflag
+is not valid.
+.It Bq Er EAGAIN
+Out of pseudo-terminal resources.
+.El
+.Sh SEE ALSO
+.Xr pts 4 ,
+.Xr ptsname 3 ,
+.Xr tty 4
+.Sh STANDARDS
+The
+.Fn posix_openpt
+function conforms to
+.St -p1003.1-2001 .
+.Sh HISTORY
+The
+.Fn posix_openpt
+function appeared in
+.Fx 5.0 .
+In
+.Fx 8.0 ,
+this function was changed to a system call.
+.Sh NOTES
+The flag
+.Dv O_NOCTTY
+is included for compatibility; in
+.Fx ,
+opening a terminal does not cause it to become a process's controlling
+terminal.
+.Sh AUTHORS
+.An Ed Schouten Aq ed@FreeBSD.org
diff --git a/lib/libc/sys/pread.c b/lib/libc/sys/pread.c
new file mode 100644
index 0000000..7566566
--- /dev/null
+++ b/lib/libc/sys/pread.c
@@ -0,0 +1,57 @@
+/*
+ * Copyright (c) 1992, 1993
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#if defined(LIBC_SCCS) && !defined(lint)
+static char sccsid[] = "@(#)mmap.c	8.1 (Berkeley) 6/17/93";
+#endif /* LIBC_SCCS and not lint */
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/types.h>
+#include <sys/syscall.h>
+#include <unistd.h>
+#include "libc_private.h"
+
+/*
+ * This function provides 64-bit offset padding that
+ * is not supplied by GCC 1.X but is supplied by GCC 2.X.
+ */
+ssize_t
+pread(fd, buf, nbyte, offset)
+	int	fd;
+	void   *buf;
+	size_t	nbyte;
+	off_t	offset;
+{
+
+	if (__getosreldate() >= 700051)
+		return (__sys_pread(fd, buf, nbyte, offset));
+	else
+		return (__sys_freebsd6_pread(fd, buf, nbyte, 0, offset));
+}
diff --git a/lib/libc/sys/profil.2 b/lib/libc/sys/profil.2
new file mode 100644
index 0000000..444d3c3
--- /dev/null
+++ b/lib/libc/sys/profil.2
@@ -0,0 +1,122 @@
+.\" Copyright (c) 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" This code is derived from software contributed to Berkeley by
+.\" Donn Seeley of BSDI.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"	@(#)profil.2	8.1 (Berkeley) 6/4/93
+.\" $FreeBSD$
+.\"
+.Dd June 4, 1993
+.Dt PROFIL 2
+.Os
+.Sh NAME
+.Nm profil
+.Nd control process profiling
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In unistd.h
+.Ft int
+.Fn profil "char *samples" "size_t size" "vm_offset_t offset" "int scale"
+.Sh DESCRIPTION
+The
+.Fn profil
+system call enables or disables
+program counter profiling of the current process.
+If profiling is enabled,
+then at every profiling clock tick,
+the kernel updates an appropriate count in the
+.Fa samples
+buffer.
+The frequency of the profiling clock is recorded
+in the header in the profiling output file.
+.Pp
+The buffer
+.Fa samples
+contains
+.Fa size
+bytes and is divided into
+a series of 16-bit bins.
+Each bin counts the number of times the program counter
+was in a particular address range in the process
+when a profiling clock tick occurred while profiling was enabled.
+For a given program counter address,
+the number of the corresponding bin is given
+by the relation:
+.Bd -literal -offset indent
+[(pc - offset) / 2] * scale / 65536
+.Ed
+.Pp
+The
+.Fa offset
+argument is the lowest address at which
+the kernel takes program counter samples.
+The
+.Fa scale
+argument ranges from 1 to 65536 and
+can be used to change the span of the bins.
+A scale of 65536 maps each bin to 2 bytes of address range;
+a scale of 32768 gives 4 bytes, 16384 gives 8 bytes and so on.
+Intermediate values provide approximate intermediate ranges.
+A
+.Fa scale
+value of 0 disables profiling.
+.Sh RETURN VALUES
+.Rv -std profil
+.Sh FILES
+.Bl -tag -width /usr/lib/gcrt0.o -compact
+.It Pa /usr/lib/gcrt0.o
+profiling C run-time startup file
+.It Pa gmon.out
+conventional name for profiling output file
+.El
+.Sh ERRORS
+The following error may be reported:
+.Bl -tag -width Er
+.It Bq Er EFAULT
+The buffer
+.Fa samples
+contains an invalid address.
+.El
+.Sh SEE ALSO
+.Xr gprof 1
+.Sh HISTORY
+The
+.Fn profil
+function appeared in
+.At v7 .
+.Sh BUGS
+This routine should be named
+.Fn profile .
+.Pp
+The
+.Fa samples
+argument should really be a vector of type
+.Fa "unsigned short" .
+.Pp
+The format of the gmon.out file is undocumented.
diff --git a/lib/libc/sys/pselect.2 b/lib/libc/sys/pselect.2
new file mode 100644
index 0000000..cf784a5
--- /dev/null
+++ b/lib/libc/sys/pselect.2
@@ -0,0 +1,122 @@
+.\"
+.\" Copyright 2002 Massachusetts Institute of Technology
+.\"
+.\" Permission to use, copy, modify, and distribute this software and
+.\" its documentation for any purpose and without fee is hereby
+.\" granted, provided that both the above copyright notice and this
+.\" permission notice appear in all copies, that both the above
+.\" copyright notice and this permission notice appear in all
+.\" supporting documentation, and that the name of M.I.T. not be used
+.\" in advertising or publicity pertaining to distribution of the
+.\" software without specific, written prior permission.  M.I.T. makes
+.\" no representations about the suitability of this software for any
+.\" purpose.  It is provided "as is" without express or implied
+.\" warranty.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''.  M.I.T. DISCLAIMS
+.\" ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE,
+.\" INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+.\" MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT
+.\" SHALL M.I.T. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+.\" SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+.\" LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
+.\" USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+.\" ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+.\" OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
+.\" OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd October 27, 2009
+.Dt PSELECT 2
+.Os
+.Sh NAME
+.Nm pselect
+.Nd synchronous I/O multiplexing a la POSIX.1g
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In sys/select.h
+.Ft int
+.Fo pselect
+.Fa "int nfds"
+.Fa "fd_set * restrict readfds"
+.Fa "fd_set * restrict writefds"
+.Fa "fd_set * restrict exceptfds"
+.Fa "const struct timespec * restrict timeout"
+.Fa "const sigset_t * restrict newsigmask"
+.Fc
+.Sh DESCRIPTION
+The
+.Fn pselect
+function was introduced by
+.St -p1003.1g-2000
+as a slightly stronger version of
+.Xr select 2 .
+The
+.Fa nfds , readfds , writefds ,
+and
+.Fa exceptfds
+arguments are all identical to the analogous arguments of
+.Fn select .
+The
+.Fa timeout
+argument in
+.Fn pselect
+points to a
+.Vt "const struct timespec"
+rather than the (modifiable)
+.Vt "struct timeval"
+used by
+.Fn select ;
+as in
+.Fn select ,
+a null pointer may be passed to indicate that
+.Fn pselect
+should wait indefinitely.
+Finally,
+.Fa newsigmask
+specifies a signal mask which is set while waiting for input.
+When
+.Fn pselect
+returns, the original signal mask is restored.
+.Pp
+See
+.Xr select 2
+for a more detailed discussion of the semantics of this interface, and
+for macros used to manipulate the
+.Vt "fd_set"
+data type.
+.Sh RETURN VALUES
+The
+.Fn pselect
+function returns the same values and under the same conditions as
+.Fn select .
+.Sh ERRORS
+The
+.Fn pselect
+function may fail for any of the reasons documented for
+.Xr select 2
+and (if a signal mask is provided)
+.Xr sigprocmask 2 .
+.Sh SEE ALSO
+.Xr kqueue 2 ,
+.Xr poll 2 ,
+.Xr select 2 ,
+.Xr sigprocmask 2
+.Sh STANDARDS
+The
+.Fn pselect
+function conforms to
+.St -p1003.1-2001 .
+.Sh HISTORY
+The
+.Fn pselect
+function first appeared in
+.Fx 5.0 .
+.Sh AUTHORS
+The first implementation of
+.Fn pselect
+function and this manual page were written by
+.An Garrett Wollman Aq wollman@FreeBSD.org .
diff --git a/lib/libc/sys/ptrace.2 b/lib/libc/sys/ptrace.2
new file mode 100644
index 0000000..f40574b
--- /dev/null
+++ b/lib/libc/sys/ptrace.2
@@ -0,0 +1,574 @@
+.\" $FreeBSD$
+.\"	$NetBSD: ptrace.2,v 1.2 1995/02/27 12:35:37 cgd Exp $
+.\"
+.\" This file is in the public domain.
+.Dd July 10, 2010
+.Dt PTRACE 2
+.Os
+.Sh NAME
+.Nm ptrace
+.Nd process tracing and debugging
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In sys/types.h
+.In sys/ptrace.h
+.Ft int
+.Fn ptrace "int request" "pid_t pid" "caddr_t addr" "int data"
+.Sh DESCRIPTION
+The
+.Fn ptrace
+system call
+provides tracing and debugging facilities.
+It allows one process
+(the
+.Em tracing
+process)
+to control another
+(the
+.Em traced
+process).
+The tracing process must first attach to the traced process, and then
+issue a series of
+.Fn ptrace
+system calls to control the execution of the process, as well as access
+process memory and register state.
+For the duration of the tracing session, the traced process will be
+.Dq re-parented ,
+with its parent process ID (and resulting behavior)
+changed to the tracing process.
+It is permissible for a tracing process to attach to more than one
+other process at a time.
+When the tracing process has completed its work, it must detach the
+traced process; if a tracing process exits without first detaching all
+processes it has attached, those processes will be killed.
+.Pp
+Most of the time, the traced process runs normally, but when it
+receives a signal
+(see
+.Xr sigaction 2 ) ,
+it stops.
+The tracing process is expected to notice this via
+.Xr wait 2
+or the delivery of a
+.Dv SIGCHLD
+signal, examine the state of the stopped process, and cause it to
+terminate or continue as appropriate.
+The signal may be a normal process signal, generated as a result of
+traced process behavior, or use of the
+.Xr kill 2
+system call; alternatively, it may be generated by the tracing facility
+as a result of attaching, system calls, or stepping by the tracing
+process.
+The tracing process may choose to intercept the signal, using it to
+observe process behavior (such as
+.Dv SIGTRAP ) ,
+or forward the signal to the process if appropriate.
+The
+.Fn ptrace
+system call
+is the mechanism by which all this happens.
+.Pp
+The
+.Fa request
+argument specifies what operation is being performed; the meaning of
+the rest of the arguments depends on the operation, but except for one
+special case noted below, all
+.Fn ptrace
+calls are made by the tracing process, and the
+.Fa pid
+argument specifies the process ID of the traced process
+or a corresponding thread ID.
+The
+.Fa request
+argument
+can be:
+.Bl -tag -width 12n
+.It Dv PT_TRACE_ME
+This request is the only one used by the traced process; it declares
+that the process expects to be traced by its parent.
+All the other arguments are ignored.
+(If the parent process does not expect to trace the child, it will
+probably be rather confused by the results; once the traced process
+stops, it cannot be made to continue except via
+.Fn ptrace . )
+When a process has used this request and calls
+.Xr execve 2
+or any of the routines built on it
+(such as
+.Xr execv 3 ) ,
+it will stop before executing the first instruction of the new image.
+Also, any setuid or setgid bits on the executable being executed will
+be ignored.
+.It Dv PT_READ_I , Dv PT_READ_D
+These requests read a single
+.Vt int
+of data from the traced process's address space.
+Traditionally,
+.Fn ptrace
+has allowed for machines with distinct address spaces for instruction
+and data, which is why there are two requests: conceptually,
+.Dv PT_READ_I
+reads from the instruction space and
+.Dv PT_READ_D
+reads from the data space.
+In the current
+.Fx
+implementation, these two requests are completely identical.
+The
+.Fa addr
+argument specifies the address
+(in the traced process's virtual address space)
+at which the read is to be done.
+This address does not have to meet any alignment constraints.
+The value read is returned as the return value from
+.Fn ptrace .
+.It Dv PT_WRITE_I , Dv PT_WRITE_D
+These requests parallel
+.Dv PT_READ_I
+and
+.Dv PT_READ_D ,
+except that they write rather than read.
+The
+.Fa data
+argument supplies the value to be written.
+.It Dv PT_IO
+This request allows reading and writing arbitrary amounts of data in
+the traced process's address space.
+The
+.Fa addr
+argument specifies a pointer to a
+.Vt "struct ptrace_io_desc" ,
+which is defined as follows:
+.Bd -literal
+struct ptrace_io_desc {
+	int	piod_op;	/* I/O operation */
+	void	*piod_offs;	/* child offset */
+	void	*piod_addr;	/* parent offset */
+	size_t	piod_len;	/* request length */
+};
+
+/*
+ * Operations in piod_op.
+ */
+#define PIOD_READ_D	1	/* Read from D space */
+#define PIOD_WRITE_D	2	/* Write to D space */
+#define PIOD_READ_I	3	/* Read from I space */
+#define PIOD_WRITE_I	4	/* Write to I space */
+.Ed
+.Pp
+The
+.Fa data
+argument is ignored.
+The actual number of bytes read or written is stored in
+.Va piod_len
+upon return.
+.It Dv PT_CONTINUE
+The traced process continues execution.
+The
+.Fa addr
+argument
+is an address specifying the place where execution is to be resumed
+(a new value for the program counter),
+or
+.Po Vt caddr_t Pc Ns 1
+to indicate that execution is to pick up where it left off.
+The
+.Fa data
+argument
+provides a signal number to be delivered to the traced process as it
+resumes execution, or 0 if no signal is to be sent.
+.It Dv PT_STEP
+The traced process is single stepped one instruction.
+The
+.Fa addr
+argument
+should be passed
+.Po Vt caddr_t Pc Ns 1 .
+The
+.Fa data
+argument
+provides a signal number to be delivered to the traced process as it
+resumes execution, or 0 if no signal is to be sent.
+.It Dv PT_KILL
+The traced process terminates, as if
+.Dv PT_CONTINUE
+had been used with
+.Dv SIGKILL
+given as the signal to be delivered.
+.It Dv PT_ATTACH
+This request allows a process to gain control of an otherwise
+unrelated process and begin tracing it.
+It does not need any cooperation from the to-be-traced process.
+In
+this case,
+.Fa pid
+specifies the process ID of the to-be-traced process, and the other
+two arguments are ignored.
+This request requires that the target process must have the same real
+UID as the tracing process, and that it must not be executing a setuid
+or setgid executable.
+(If the tracing process is running as root, these restrictions do not
+apply.)
+The tracing process will see the newly-traced process stop and may
+then control it as if it had been traced all along.
+.It Dv PT_DETACH
+This request is like PT_CONTINUE, except that it does not allow
+specifying an alternate place to continue execution, and after it
+succeeds, the traced process is no longer traced and continues
+execution normally.
+.It Dv PT_GETREGS
+This request reads the traced process's machine registers into the
+.Do
+.Vt "struct reg"
+.Dc
+(defined in
+.In machine/reg.h )
+pointed to by
+.Fa addr .
+.It Dv PT_SETREGS
+This request is the converse of
+.Dv PT_GETREGS ;
+it loads the traced process's machine registers from the
+.Do
+.Vt "struct reg"
+.Dc
+(defined in
+.In machine/reg.h )
+pointed to by
+.Fa addr .
+.It Dv PT_GETFPREGS
+This request reads the traced process's floating-point registers into
+the
+.Do
+.Vt "struct fpreg"
+.Dc
+(defined in
+.In machine/reg.h )
+pointed to by
+.Fa addr .
+.It Dv PT_SETFPREGS
+This request is the converse of
+.Dv PT_GETFPREGS ;
+it loads the traced process's floating-point registers from the
+.Do
+.Vt "struct fpreg"
+.Dc
+(defined in
+.In machine/reg.h )
+pointed to by
+.Fa addr .
+.It Dv PT_GETDBREGS
+This request reads the traced process's debug registers into
+the
+.Do
+.Vt "struct dbreg"
+.Dc
+(defined in
+.In machine/reg.h )
+pointed to by
+.Fa addr .
+.It Dv PT_SETDBREGS
+This request is the converse of
+.Dv PT_GETDBREGS ;
+it loads the traced process's debug registers from the
+.Do
+.Vt "struct dbreg"
+.Dc
+(defined in
+.In machine/reg.h )
+pointed to by
+.Fa addr .
+.It Dv PT_LWPINFO
+This request can be used to obtain information about the kernel thread,
+also known as light-weight process, that caused the traced process to stop.
+The
+.Fa addr
+argument specifies a pointer to a
+.Vt "struct ptrace_lwpinfo" ,
+which is defined as follows:
+.Bd -literal
+struct ptrace_lwpinfo {
+	lwpid_t pl_lwpid;
+	int	pl_event;
+	int	pl_flags;
+	sigset_t pl_sigmask;
+	sigset_t pl_siglist;
+	siginfo_t pl_siginfo;
+};
+.Ed
+.Pp
+The
+.Fa data
+argument is to be set to the size of the structure known to the caller.
+This allows the structure to grow without affecting older programs.
+.Pp
+The fields in the
+.Vt "struct ptrace_lwpinfo"
+have the following meaning:
+.Bl -tag -width indent -compact
+.It pl_lwpid
+LWP id of the thread
+.It pl_event
+Event that caused the stop.
+Currently defined events are
+.Bl -tag -width indent -compact
+.It PL_EVENT_NONE
+No reason given
+.It PL_EVENT_SIGNAL
+Thread stopped due to the pending signal
+.El
+.It pl_flags
+Flags that specify additional details about observed stop.
+Currently defined flags are:
+.Bl -tag -width indent -compact
+.It PL_FLAG_SCE
+The thread stopped due to system call entry, right after the kernel is entered.
+The debugger may examine syscall arguments that are stored in memory and
+registers according to the ABI of the current process, and modify them,
+if needed.
+.It PL_FLAG_SCX
+The thread is stopped immediately before syscall is returning to the usermode.
+The debugger may examine system call return values in the ABI-defined registers
+and/or memory.
+.It PL_FLAG_EXEC
+When
+.Dv PL_FLAG_SCX
+is set, this flag may be additionally specified to inform that the
+program being executed by debuggee process has been changed by successful
+execution of a system call from the
+.Fn execve 2
+family.
+.It PL_FLAG_SI
+Indicates that
+.Va pl_siginfo
+member of
+.Vt "struct ptrace_lwpinfo"
+contains valid information.
+.El
+.It pl_sigmask
+The current signal mask of the LWP
+.It pl_siglist
+The current pending set of signals for the LWP.
+Note that signals that are delivered to the process would not appear
+on an LWP siglist until the thread is selected for delivery.
+.It pl_siginfo
+The siginfo that accompanies the signal pending.
+Only valid for
+.Dv PL_EVENT_SIGNAL
+kind of stop, when
+.Va pl_flags
+has
+.Dv PL_FLAG_SI
+set.
+.El
+.It PT_GETNUMLWPS
+This request returns the number of kernel threads associated with the
+traced process.
+.It PT_GETLWPLIST
+This request can be used to get the current thread list.
+A pointer to an array of type
+.Vt lwpid_t
+should be passed in
+.Fa addr ,
+with the array size specified by
+.Fa data .
+The return value from
+.Fn ptrace
+is the count of array entries filled in.
+.It PT_SETSTEP
+This request will turn on single stepping of the specified process.
+.It PT_CLEARSTEP
+This request will turn off single stepping of the specified process.
+.It PT_SUSPEND
+This request will suspend the specified thread.
+.It PT_RESUME
+This request will resume the specified thread.
+.It PT_TO_SCE
+This request will trace the specified process on each system call entry.
+.It PT_TO_SCX
+This request will trace the specified process on each system call exit.
+.It PT_SYSCALL
+This request will trace the specified process
+on each system call entry and exit.
+.It PT_VM_TIMESTAMP
+This request returns the generation number or timestamp of the memory map of
+the traced process as the return value from
+.Fn ptrace .
+This provides a low-cost way for the tracing process to determine if the
+VM map changed since the last time this request was made.
+.It PT_VM_ENTRY
+This request is used to iterate over the entries of the VM map of the traced
+process.
+The
+.Fa addr
+argument specifies a pointer to a 
+.Vt "struct ptrace_vm_entry" ,
+which is defined as follows:
+.Bd -literal
+struct ptrace_vm_entry {
+	int		pve_entry;
+	int		pve_timestamp;
+	u_long		pve_start;
+	u_long		pve_end;
+	u_long		pve_offset;
+	u_int		pve_prot;
+	u_int		pve_pathlen;
+	long		pve_fileid;
+	uint32_t	pve_fsid;
+	char		*pve_path;
+};
+.Ed
+.Pp
+The first entry is returned by setting
+.Va pve_entry
+to zero.
+Subsequent entries are returned by leaving
+.Va pve_entry
+unmodified from the value returned by previous requests.
+The
+.Va pve_timestamp
+field can be used to detect changes to the VM map while iterating over the
+entries.
+The tracing process can then take appropriate action, such as restarting.
+By setting
+.Va pve_pathlen
+to a non-zero value on entry, the pathname of the backing object is returned
+in the buffer pointed to by
+.Va pve_path ,
+provided the entry is backed by a vnode.
+The
+.Va pve_pathlen
+field is updated with the actual length of the pathname (including the
+terminating null character).
+The
+.Va pve_offset
+field is the offset within the backing object at which the range starts.
+The range is located in the VM space at
+.Va pve_start
+and extends up to
+.Va pve_end
+(inclusive).
+.Pp
+The
+.Fa data
+argument is ignored.
+.El
+.Pp
+Additionally, machine-specific requests can exist.
+.Sh RETURN VALUES
+Some requests can cause
+.Fn ptrace
+to return
+\-1
+as a non-error value; to disambiguate,
+.Va errno
+can be set to 0 before the call and checked afterwards.
+.Sh ERRORS
+The
+.Fn ptrace
+system call may fail if:
+.Bl -tag -width Er
+.It Bq Er ESRCH
+.Bl -bullet -compact
+.It
+No process having the specified process ID exists.
+.El
+.It Bq Er EINVAL
+.Bl -bullet -compact
+.It
+A process attempted to use
+.Dv PT_ATTACH
+on itself.
+.It
+The
+.Fa request
+argument
+was not one of the legal requests.
+.It
+The signal number
+(in
+.Fa data )
+to
+.Dv PT_CONTINUE
+was neither 0 nor a legal signal number.
+.It
+.Dv PT_GETREGS ,
+.Dv PT_SETREGS ,
+.Dv PT_GETFPREGS ,
+.Dv PT_SETFPREGS ,
+.Dv PT_GETDBREGS ,
+or
+.Dv PT_SETDBREGS
+was attempted on a process with no valid register set.
+(This is normally true only of system processes.)
+.It
+.Dv PT_VM_ENTRY
+was given an invalid value for
+.Fa pve_entry .
+This can also be caused by changes to the VM map of the process.
+.El
+.It Bq Er EBUSY
+.Bl -bullet -compact
+.It
+.Dv PT_ATTACH
+was attempted on a process that was already being traced.
+.It
+A request attempted to manipulate a process that was being traced by
+some process other than the one making the request.
+.It
+A request
+(other than
+.Dv PT_ATTACH )
+specified a process that was not stopped.
+.El
+.It Bq Er EPERM
+.Bl -bullet -compact
+.It
+A request
+(other than
+.Dv PT_ATTACH )
+attempted to manipulate a process that was not being traced at all.
+.It
+An attempt was made to use
+.Dv PT_ATTACH
+on a process in violation of the requirements listed under
+.Dv PT_ATTACH
+above.
+.El
+.It Bq Er ENOENT
+.Bl -bullet -compact
+.It
+.Dv PT_VM_ENTRY
+previously returned the last entry of the memory map.
+No more entries exist.
+.El
+.It Bq Er ENAMETOOLONG
+.Bl -bullet -compact
+.It
+.Dv PT_VM_ENTRY
+cannot return the pathname of the backing object because the buffer is not big
+enough.
+.Fa pve_pathlen
+holds the minimum buffer size required on return.
+.El
+.El
+.Sh SEE ALSO
+.Xr execve 2 ,
+.Xr sigaction 2 ,
+.Xr wait 2 ,
+.Xr execv 3 ,
+.Xr i386_clr_watch 3 ,
+.Xr i386_set_watch 3
+.Sh HISTORY
+The
+.Fn ptrace
+function appeared in
+.At v7 .
+.Sh BUGS
+The
+.Dv PL_FLAG_SCE ,
+.Dv PL_FLAG_SCX
+and
+.Dv PL_FLAG_EXEC
+are not implemented for MIPS and ARM architectures.
diff --git a/lib/libc/sys/pwrite.c b/lib/libc/sys/pwrite.c
new file mode 100644
index 0000000..d17ed29
--- /dev/null
+++ b/lib/libc/sys/pwrite.c
@@ -0,0 +1,56 @@
+/*
+ * Copyright (c) 1992, 1993
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#if defined(LIBC_SCCS) && !defined(lint)
+static char sccsid[] = "@(#)mmap.c	8.1 (Berkeley) 6/17/93";
+#endif /* LIBC_SCCS and not lint */
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/types.h>
+#include <sys/syscall.h>
+#include <unistd.h>
+#include "libc_private.h"
+
+/*
+ * This function provides 64-bit offset padding that
+ * is not supplied by GCC 1.X but is supplied by GCC 2.X.
+ */
+ssize_t
+pwrite(fd, buf, nbyte, offset)
+	int	fd;
+	const void *buf;
+	size_t	nbyte;
+	off_t	offset;
+{
+	if (__getosreldate() >= 700051)
+		return (__sys_pwrite(fd, buf, nbyte, offset));
+	else
+		return (__sys_freebsd6_pwrite(fd, buf, nbyte, 0, offset));
+}
diff --git a/lib/libc/sys/quotactl.2 b/lib/libc/sys/quotactl.2
new file mode 100644
index 0000000..ff3cb4b
--- /dev/null
+++ b/lib/libc/sys/quotactl.2
@@ -0,0 +1,261 @@
+.\" Copyright (c) 1983, 1990, 1991, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" This code is derived from software contributed to Berkeley by
+.\" Robert Elz at The University of Melbourne.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"	@(#)quotactl.2	8.2 (Berkeley) 3/10/95
+.\" $FreeBSD$
+.\"
+.Dd March 5, 1999
+.Dt QUOTACTL 2
+.Os
+.Sh NAME
+.Nm quotactl
+.Nd manipulate file system quotas
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In sys/types.h
+.In ufs/ufs/quota.h
+.Ft int
+.Fn quotactl "const char *path" "int cmd" "int id" "void *addr"
+.Sh DESCRIPTION
+The
+.Fn quotactl
+system call enables, disables and
+manipulates file system quotas.
+A quota control command
+given by
+.Fa cmd
+operates on the given filename
+.Fa path
+for the given user or group
+.Fa id .
+(NOTE: One should use the QCMD macro defined in
+.In ufs/ufs/quota.h
+to formulate the value for
+.Fa cmd . )
+The address of an optional command specific data structure,
+.Fa addr ,
+may be given; its interpretation
+is discussed below with each command.
+.Pp
+For commands that use the
+.Fa id
+identifier, it must be either -1 or any positive value.
+The value of -1 indicates that the current UID or GID should be used.
+Any other negative value will return an error.
+.Pp
+Currently quotas are supported only for the
+.Dq ufs
+file system.
+For
+.Dq ufs ,
+a command is composed of a primary command (see below)
+and a command type used to interpret the
+.Fa id .
+Types are supported for interpretation of user identifiers (USRQUOTA)
+and group identifiers (GRPQUOTA).
+The
+.Dq ufs
+specific commands are:
+.Bl -tag -width Q_GETQUOTASIZEx
+.It Dv Q_QUOTAON
+Enable disk quotas for the file system specified by
+.Fa path .
+The command type specifies the type of the quotas being enabled.
+The
+.Fa addr
+argument specifies a file from which to take the quotas.
+The quota file must exist;
+it is normally created with the
+.Xr quotacheck 8
+program.
+The
+.Fa id
+argument is unused.
+Only the super-user may turn quotas on.
+.It Dv Q_QUOTAOFF
+Disable disk quotas for the file system specified by
+.Fa path .
+The command type specifies the type of the quotas being disabled.
+The
+.Fa addr
+and
+.Fa id
+arguments are unused.
+Only the super-user may turn quotas off.
+.It Dv Q_GETQUOTASIZE
+Get the wordsize used to represent the quotas for the user or group
+(as determined by the command type).
+Possible values are 32 for the old-style quota file 
+and 64 for the new-style quota file.
+The
+.Fa addr
+argument is a pointer to an integer into which the size is stored.
+The identifier
+.Fa id
+is not used.
+.It Dv Q_GETQUOTA
+Get disk quota limits and current usage for the user or group
+(as determined by the command type) with identifier
+.Fa id .
+The
+.Fa addr
+argument
+is a pointer to a
+.Fa struct dqblk
+structure (defined in
+.In ufs/ufs/quota.h ) .
+.It Dv Q_SETQUOTA
+Set disk quota limits for the user or group
+(as determined by the command type) with identifier
+.Fa id .
+The
+.Fa addr
+argument
+is a pointer to a
+.Fa struct dqblk
+structure (defined in
+.In ufs/ufs/quota.h ) .
+The usage fields of the
+.Fa dqblk
+structure are ignored.
+This system call is restricted to the super-user.
+.It Dv Q_SETUSE
+Set disk usage limits for the user or group
+(as determined by the command type) with identifier
+.Fa id .
+The
+.Fa addr
+argument
+is a pointer to a
+.Fa struct dqblk
+structure (defined in
+.In ufs/ufs/quota.h ) .
+Only the usage fields are used.
+This system call is restricted to the super-user.
+.It Dv Q_SYNC
+Update the on-disk copy of quota usages.
+The command type specifies which type of quotas are to be updated.
+The
+.Fa id
+and
+.Fa addr
+arguments are ignored.
+.El
+.Sh RETURN VALUES
+.Rv -std quotactl
+.Sh ERRORS
+The
+.Fn quotactl
+system call will fail if:
+.Bl -tag -width Er
+.It Bq Er EOPNOTSUPP
+The kernel has not been compiled with the
+.Dv QUOTA
+option.
+.It Bq Er EUSERS
+The quota table cannot be expanded.
+.It Bq Er EINVAL
+The
+.Fa cmd
+argument
+or the command type is invalid.
+In
+.Dv Q_GETQUOTASIZE ,
+.Dv Q_GETQUOTA ,
+.Dv Q_SETQUOTA ,
+and
+.Dv Q_SETUSE ,
+quotas are not currently enabled for this file system.
+.Pp
+The
+.Fa id
+argument to
+.Dv Q_GETQUOTA ,
+.Dv Q_SETQUOTA 
+or
+.Dv Q_SETUSE
+is a negative value.
+.It Bq Er EACCES
+In
+.Dv Q_QUOTAON ,
+the quota file is not a plain file.
+.It Bq Er EACCES
+Search permission is denied for a component of a path prefix.
+.It Bq Er ENOTDIR
+A component of a path prefix was not a directory.
+.It Bq Er ENAMETOOLONG
+A component of either pathname exceeded 255 characters,
+or the entire length of either path name exceeded 1023 characters.
+.It Bq Er ENOENT
+A filename does not exist.
+.It Bq Er ELOOP
+Too many symbolic links were encountered in translating a pathname.
+.It Bq Er EROFS
+In
+.Dv Q_QUOTAON ,
+either the file system on which quotas are to be enabled is mounted read-only
+or the quota file resides on a read-only file system.
+.It Bq Er EIO
+An
+.Tn I/O
+error occurred while reading from or writing
+to a file containing quotas.
+.It Bq Er EFAULT
+An invalid
+.Fa addr
+was supplied; the associated structure could not be copied in or out
+of the kernel.
+.It Bq Er EFAULT
+The
+.Fa path
+argument
+points outside the process's allocated address space.
+.It Bq Er EPERM
+The call was privileged and the caller was not the super-user.
+.El
+.Sh SEE ALSO
+.Xr quota 1 ,
+.Xr fstab 5 ,
+.Xr edquota 8 ,
+.Xr quotacheck 8 ,
+.Xr quotaon 8 ,
+.Xr repquota 8
+.Sh HISTORY
+The
+.Fn quotactl
+system call appeared in
+.Bx 4.3 Reno .
+.Sh BUGS
+There should be some way to integrate this call with the resource
+limit interface provided by
+.Xr setrlimit 2
+and
+.Xr getrlimit 2 .
diff --git a/lib/libc/sys/read.2 b/lib/libc/sys/read.2
new file mode 100644
index 0000000..19e4ffe
--- /dev/null
+++ b/lib/libc/sys/read.2
@@ -0,0 +1,283 @@
+.\" Copyright (c) 1980, 1991, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"     @(#)read.2	8.4 (Berkeley) 2/26/94
+.\" $FreeBSD$
+.\"
+.Dd October 11, 2006
+.Dt READ 2
+.Os
+.Sh NAME
+.Nm read ,
+.Nm readv ,
+.Nm pread ,
+.Nm preadv
+.Nd read input
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In sys/types.h
+.In sys/uio.h
+.In unistd.h
+.Ft ssize_t
+.Fn read "int d" "void *buf" "size_t nbytes"
+.Ft ssize_t
+.Fn pread "int d" "void *buf" "size_t nbytes" "off_t offset"
+.Ft ssize_t
+.Fn readv "int d" "const struct iovec *iov" "int iovcnt"
+.Ft ssize_t
+.Fn preadv "int d" "const struct iovec *iov" "int iovcnt" "off_t offset"
+.Sh DESCRIPTION
+The
+.Fn read
+system call
+attempts to read
+.Fa nbytes
+of data from the object referenced by the descriptor
+.Fa d
+into the buffer pointed to by
+.Fa buf .
+The
+.Fn readv
+system call
+performs the same action, but scatters the input data
+into the
+.Fa iovcnt
+buffers specified by the members of the
+.Fa iov
+array: iov[0], iov[1], ..., iov[iovcnt\|\-\|1].
+The
+.Fn pread
+and
+.Fn preadv
+system calls
+perform the same functions, but read from the specified position in
+the file without modifying the file pointer.
+.Pp
+For
+.Fn readv
+and
+.Fn preadv ,
+the
+.Fa iovec
+structure is defined as:
+.Pp
+.Bd -literal -offset indent -compact
+struct iovec {
+	void   *iov_base;  /* Base address. */
+	size_t iov_len;    /* Length. */
+};
+.Ed
+.Pp
+Each
+.Fa iovec
+entry specifies the base address and length of an area
+in memory where data should be placed.
+The
+.Fn readv
+system call
+will always fill an area completely before proceeding
+to the next.
+.Pp
+On objects capable of seeking, the
+.Fn read
+starts at a position
+given by the pointer associated with
+.Fa d
+(see
+.Xr lseek 2 ) .
+Upon return from
+.Fn read ,
+the pointer is incremented by the number of bytes actually read.
+.Pp
+Objects that are not capable of seeking always read from the current
+position.
+The value of the pointer associated with such an
+object is undefined.
+.Pp
+Upon successful completion,
+.Fn read ,
+.Fn readv ,
+.Fn pread
+and
+.Fn preadv
+return the number of bytes actually read and placed in the buffer.
+The system guarantees to read the number of bytes requested if
+the descriptor references a normal file that has that many bytes left
+before the end-of-file, but in no other case.
+.Sh RETURN VALUES
+If successful, the
+number of bytes actually read is returned.
+Upon reading end-of-file,
+zero is returned.
+Otherwise, a -1 is returned and the global variable
+.Va errno
+is set to indicate the error.
+.Sh ERRORS
+The
+.Fn read ,
+.Fn readv ,
+.Fn pread
+and
+.Fn preadv
+system calls
+will succeed unless:
+.Bl -tag -width Er
+.It Bq Er EBADF
+The
+.Fa d
+argument
+is not a valid file or socket descriptor open for reading.
+.It Bq Er ECONNRESET
+The
+.Fa d
+argument refers to a socket, and the remote socket end is
+forcibly closed.
+.It Bq Er EFAULT
+The
+.Fa buf
+argument
+points outside the allocated address space.
+.It Bq Er EIO
+An I/O error occurred while reading from the file system.
+.It Bq Er EINTR
+A read from a slow device
+(i.e.\& one that might block for an arbitrary amount of time)
+was interrupted by the delivery of a signal
+before any data arrived.
+.It Bq Er EINVAL
+The pointer associated with
+.Fa d
+was negative.
+.It Bq Er EAGAIN
+The file was marked for non-blocking I/O,
+and no data were ready to be read.
+.It Bq Er EISDIR
+The file descriptor is associated with a directory residing
+on a file system that does not allow regular read operations on
+directories (e.g.\& NFS).
+.It Bq Er EOPNOTSUPP
+The file descriptor is associated with a file system and file type that
+do not allow regular read operations on it.
+.It Bq Er EOVERFLOW
+The file descriptor is associated with a regular file,
+.Fa nbytes
+is greater than 0,
+.Fa offset
+is before the end-of-file, and
+.Fa offset
+is greater than or equal to the offset maximum established
+for this file system.
+.It Bq Er EINVAL
+The value
+.Fa nbytes
+is greater than
+.Dv INT_MAX .
+.El
+.Pp
+In addition,
+.Fn readv
+and
+.Fn preadv
+may return one of the following errors:
+.Bl -tag -width Er
+.It Bq Er EINVAL
+The
+.Fa iovcnt
+argument
+was less than or equal to 0, or greater than
+.Dv IOV_MAX .
+.It Bq Er EINVAL
+One of the
+.Fa iov_len
+values in the
+.Fa iov
+array was negative.
+.It Bq Er EINVAL
+The sum of the
+.Fa iov_len
+values in the
+.Fa iov
+array overflowed a 32-bit integer.
+.It Bq Er EFAULT
+Part of the
+.Fa iov
+array points outside the process's allocated address space.
+.El
+.Pp
+The
+.Fn pread
+and
+.Fn preadv
+system calls may also return the following errors:
+.Bl -tag -width Er
+.It Bq Er EINVAL
+The
+.Fa offset
+value was negative.
+.It Bq Er ESPIPE
+The file descriptor is associated with a pipe, socket, or FIFO.
+.El
+.Sh SEE ALSO
+.Xr dup 2 ,
+.Xr fcntl 2 ,
+.Xr getdirentries 2 ,
+.Xr open 2 ,
+.Xr pipe 2 ,
+.Xr select 2 ,
+.Xr socket 2 ,
+.Xr socketpair 2 ,
+.Xr fread 3 ,
+.Xr readdir 3
+.Sh STANDARDS
+The
+.Fn read
+system call is expected to conform to
+.St -p1003.1-90 .
+The
+.Fn readv
+and
+.Fn pread
+system calls are expected to conform to
+.St -xpg4.2 .
+.Sh HISTORY
+The
+.Fn preadv
+system call appeared in
+.Fx 6.0 .
+The
+.Fn pread
+function appeared in
+.At V.4 .
+The
+.Fn readv
+system call appeared in
+.Bx 4.2 .
+The
+.Fn read
+function appeared in
+.At v6 .
diff --git a/lib/libc/sys/readlink.2 b/lib/libc/sys/readlink.2
new file mode 100644
index 0000000..4b24052
--- /dev/null
+++ b/lib/libc/sys/readlink.2
@@ -0,0 +1,158 @@
+.\" Copyright (c) 1983, 1991, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"     @(#)readlink.2	8.1 (Berkeley) 6/4/93
+.\" $FreeBSD$
+.\"
+.Dd April 10, 2008
+.Dt READLINK 2
+.Os
+.Sh NAME
+.Nm readlink ,
+.Nm readlinkat
+.Nd read value of a symbolic link
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In unistd.h
+.Ft ssize_t
+.Fn readlink "const char *restrict path" "char *restrict buf" "size_t bufsiz"
+.Ft ssize_t
+.Fo readlinkat
+.Fa "int fd" "const char *restrict path" "char *restrict buf" "size_t bufsize"
+.Fc
+.Sh DESCRIPTION
+The
+.Fn readlink
+system call
+places the contents of the symbolic link
+.Fa path
+in the buffer
+.Fa buf ,
+which has size
+.Fa bufsiz .
+The
+.Fn readlink
+system call does not append a
+.Dv NUL
+character to
+.Fa buf .
+.Pp
+The
+.Fn readlinkat
+system call is equivalent to
+.Fn readlink
+except in the case where
+.Fa path
+specifies a relative path.
+In this case the symbolic link whose content is read relative to the
+directory associated with the file descriptor
+.Fa fd
+instead of the current working directory.
+If
+.Fn readlinkat
+is passed the special value
+.Dv AT_FDCWD
+in the
+.Fa fd
+parameter, the current working directory is used and the behavior is
+identical to a call to
+.Fn readlink .
+.Sh RETURN VALUES
+The call returns the count of characters placed in the buffer
+if it succeeds, or a \-1 if an error occurs, placing the error
+code in the global variable
+.Va errno .
+.Sh ERRORS
+The
+.Fn readlink
+system call
+will fail if:
+.Bl -tag -width Er
+.It Bq Er ENOTDIR
+A component of the path prefix is not a directory.
+.It Bq Er ENAMETOOLONG
+A component of a pathname exceeded 255 characters,
+or an entire path name exceeded 1023 characters.
+.It Bq Er ENOENT
+The named file does not exist.
+.It Bq Er EACCES
+Search permission is denied for a component of the path prefix.
+.It Bq Er ELOOP
+Too many symbolic links were encountered in translating the pathname.
+.It Bq Er EINVAL
+The named file is not a symbolic link.
+.It Bq Er EIO
+An I/O error occurred while reading from the file system.
+.It Bq Er EFAULT
+The
+.Fa buf
+argument
+extends outside the process's allocated address space.
+.El
+.Pp
+In addition to the errors returned by the
+.Fn readlink ,
+the
+.Fn readlinkat
+may fail if:
+.Bl -tag -width Er
+.It Bq Er EBADF
+The
+.Fa path
+argument does not specify an absolute path and the
+.Fa fd
+argument is neither
+.Dv AT_FDCWD
+nor a valid file descriptor open for searching.
+.It Bq Er ENOTDIR
+The
+.Fa path
+argument is not an absolute path and
+.Fa fd
+is neither
+.Dv AT_FDCWD
+nor a file descriptor associated with a directory.
+.El
+.Sh SEE ALSO
+.Xr lstat 2 ,
+.Xr stat 2 ,
+.Xr symlink 2 ,
+.Xr symlink 7
+.Sh STANDARDS
+The
+.Fn readlinkat
+system call follows The Open Group Extended API Set 2 specification.
+.Sh HISTORY
+The
+.Fn readlink
+system call appeared in
+.Bx 4.2 .
+The
+.Fn readlinkat
+system call appeared in
+.Fx 8.0 .
diff --git a/lib/libc/sys/reboot.2 b/lib/libc/sys/reboot.2
new file mode 100644
index 0000000..f5571ae
--- /dev/null
+++ b/lib/libc/sys/reboot.2
@@ -0,0 +1,166 @@
+.\" Copyright (c) 1980, 1991, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"     @(#)reboot.2	8.1 (Berkeley) 6/4/93
+.\" $FreeBSD$
+.\"
+.Dd June 4, 1993
+.Dt REBOOT 2
+.Os
+.Sh NAME
+.Nm reboot
+.Nd reboot system or halt processor
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In unistd.h
+.In sys/reboot.h
+.Ft int
+.Fn reboot "int howto"
+.Sh DESCRIPTION
+The
+.Fn reboot
+system call
+reboots the system.
+Only the super-user may reboot a machine on demand.
+However, a reboot is invoked
+automatically in the event of unrecoverable system failures.
+.Pp
+The
+.Fa howto
+argument
+is a mask of options; the system call interface allows the following
+options, defined in the include file
+.In sys/reboot.h ,
+to be passed
+to the new kernel or the new bootstrap and init programs.
+.Bl -tag -width RB_INITNAMEA
+.It Dv RB_AUTOBOOT
+The default, causing the system to reboot in its usual fashion.
+.It Dv RB_ASKNAME
+Interpreted by the bootstrap program itself, causing it to
+prompt on the console as to what file should be booted.
+Normally, the system is booted from the file
+.Dq Ar xx Ns No (0,0)kernel ,
+where
+.Ar xx
+is the default disk name,
+without prompting for the file name.
+.It Dv RB_DFLTROOT
+Use the compiled in root device.
+Normally, the system uses the device from which it was booted
+as the root device if possible.
+(The default behavior is dependent on the ability of the bootstrap program
+to determine the drive from which it was loaded, which is not possible
+on all systems.)
+.It Dv RB_DUMP
+Dump kernel memory before rebooting; see
+.Xr savecore 8
+for more information.
+.It Dv RB_HALT
+the processor is simply halted; no reboot takes place.
+This option should be used with caution.
+.It Dv RB_POWEROFF
+After halting, the shutdown code will do what it can to turn
+off the power.
+This requires hardware support.
+.It Dv RB_INITNAME
+An option allowing the specification of an init program (see
+.Xr init 8 )
+other than
+.Pa /sbin/init
+to be run when the system reboots.
+This switch is not currently available.
+.It Dv RB_KDB
+Load the symbol table and enable a built-in debugger in the system.
+This option will have no useful function if the kernel is not configured
+for debugging.
+Several other options have different meaning if combined
+with this option, although their use may not be possible
+via the
+.Fn reboot
+system call.
+See
+.Xr ddb 4
+for more information.
+.It Dv RB_NOSYNC
+Normally, the disks are sync'd (see
+.Xr sync 8 )
+before the processor is halted or rebooted.
+This option may be useful if file system changes have been made manually
+or if the processor is on fire.
+.It Dv RB_RDONLY
+Initially mount the root file system read-only.
+This is currently the default, and this option has been deprecated.
+.It Dv RB_SINGLE
+Normally, the reboot procedure involves an automatic disk consistency
+check and then multi-user operations.
+.Dv RB_SINGLE
+prevents this, booting the system with a single-user shell
+on the console.
+.Dv RB_SINGLE
+is actually interpreted by the
+.Xr init 8
+program in the newly booted system.
+.El
+.Pp
+When no options are given (i.e.,
+.Dv RB_AUTOBOOT
+is used), the system is
+rebooted from file
+.Dq kernel
+in the root file system of unit 0
+of a disk chosen in a processor specific way.
+An automatic consistency check of the disks is normally performed
+(see
+.Xr fsck 8 ) .
+.Sh RETURN VALUES
+If successful, this call never returns.
+Otherwise, a -1 is returned and an error is returned in the global
+variable
+.Va errno .
+.Sh ERRORS
+.Bl -tag -width Er
+.It Bq Er EPERM
+The caller is not the super-user.
+.El
+.Sh SEE ALSO
+.Xr crash 8 ,
+.Xr halt 8 ,
+.Xr init 8 ,
+.Xr reboot 8 ,
+.Xr savecore 8
+.Sh HISTORY
+The
+.Fn reboot
+system call appeared in
+.Bx 4.0 .
+.Sh BUGS
+The HP300 implementation supports neither
+.Dv RB_DFLTROOT
+nor
+.Dv RB_KDB .
diff --git a/lib/libc/sys/recv.2 b/lib/libc/sys/recv.2
new file mode 100644
index 0000000..66f311f
--- /dev/null
+++ b/lib/libc/sys/recv.2
@@ -0,0 +1,330 @@
+.\" Copyright (c) 1983, 1990, 1991, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"     @(#)recv.2	8.3 (Berkeley) 2/21/94
+.\" $FreeBSD$
+.\"
+.Dd December 28, 2006
+.Dt RECV 2
+.Os
+.Sh NAME
+.Nm recv ,
+.Nm recvfrom ,
+.Nm recvmsg
+.Nd receive a message from a socket
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In sys/types.h
+.In sys/socket.h
+.Ft ssize_t
+.Fn recv "int s" "void *buf" "size_t len" "int flags"
+.Ft ssize_t
+.Fn recvfrom "int s" "void * restrict buf" "size_t len" "int flags" "struct sockaddr * restrict from" "socklen_t * restrict fromlen"
+.Ft ssize_t
+.Fn recvmsg "int s" "struct msghdr *msg" "int flags"
+.Sh DESCRIPTION
+The
+.Fn recvfrom
+and
+.Fn recvmsg
+system calls
+are used to receive messages from a socket,
+and may be used to receive data on a socket whether or not
+it is connection-oriented.
+.Pp
+If
+.Fa from
+is not a null pointer
+and the socket is not connection-oriented,
+the source address of the message is filled in.
+The
+.Fa fromlen
+argument
+is a value-result argument, initialized to the size of
+the buffer associated with
+.Fa from ,
+and modified on return to indicate the actual size of the
+address stored there.
+.Pp
+The
+.Fn recv
+function is normally used only on a
+.Em connected
+socket (see
+.Xr connect 2 )
+and is identical to
+.Fn recvfrom
+with a
+null pointer passed as its
+.Fa from
+argument.
+.Pp
+All three routines return the length of the message on successful
+completion.
+If a message is too long to fit in the supplied buffer,
+excess bytes may be discarded depending on the type of socket
+the message is received from (see
+.Xr socket 2 ) .
+.Pp
+If no messages are available at the socket, the
+receive call waits for a message to arrive, unless
+the socket is non-blocking (see
+.Xr fcntl 2 )
+in which case the value
+\-1 is returned and the global variable
+.Va errno
+is set to
+.Er EAGAIN .
+The receive calls normally return any data available,
+up to the requested amount,
+rather than waiting for receipt of the full amount requested;
+this behavior is affected by the socket-level options
+.Dv SO_RCVLOWAT
+and
+.Dv SO_RCVTIMEO
+described in
+.Xr getsockopt 2 .
+.Pp
+The
+.Xr select 2
+system call may be used to determine when more data arrives.
+.Pp
+The
+.Fa flags
+argument to a
+.Fn recv
+function is formed by
+.Em or Ap ing
+one or more of the values:
+.Bl -column ".Dv MSG_DONTWAIT" -offset indent
+.It Dv MSG_OOB Ta process out-of-band data
+.It Dv MSG_PEEK Ta peek at incoming message
+.It Dv MSG_WAITALL Ta wait for full request or error
+.It Dv MSG_DONTWAIT Ta do not block
+.El
+.Pp
+The
+.Dv MSG_OOB
+flag requests receipt of out-of-band data
+that would not be received in the normal data stream.
+Some protocols place expedited data at the head of the normal
+data queue, and thus this flag cannot be used with such protocols.
+The
+.Dv MSG_PEEK
+flag causes the receive operation to return data
+from the beginning of the receive queue without removing that
+data from the queue.
+Thus, a subsequent receive call will return the same data.
+The
+.Dv MSG_WAITALL
+flag requests that the operation block until
+the full request is satisfied.
+However, the call may still return less data than requested
+if a signal is caught, an error or disconnect occurs,
+or the next data to be received is of a different type than that returned.
+The
+.Dv MSG_DONTWAIT
+flag requests the call to return when it would block otherwise.
+If no data is available,
+.Va errno
+is set to
+.Er EAGAIN .
+This flag is not available in strict
+.Tn ANSI
+or C99 compilation mode.
+.Pp
+The
+.Fn recvmsg
+system call uses a
+.Fa msghdr
+structure to minimize the number of directly supplied arguments.
+This structure has the following form, as defined in
+.In sys/socket.h :
+.Bd -literal
+struct msghdr {
+	void		*msg_name;	/* optional address */
+	socklen_t	 msg_namelen;	/* size of address */
+	struct iovec	*msg_iov;	/* scatter/gather array */
+	int		 msg_iovlen;	/* # elements in msg_iov */
+	void		*msg_control;	/* ancillary data, see below */
+	socklen_t	 msg_controllen;/* ancillary data buffer len */
+	int		 msg_flags;	/* flags on received message */
+};
+.Ed
+.Pp
+Here
+.Fa msg_name
+and
+.Fa msg_namelen
+specify the destination address if the socket is unconnected;
+.Fa msg_name
+may be given as a null pointer if no names are desired or required.
+The
+.Fa msg_iov
+and
+.Fa msg_iovlen
+arguments
+describe scatter gather locations, as discussed in
+.Xr read 2 .
+The
+.Fa msg_control
+argument,
+which has length
+.Fa msg_controllen ,
+points to a buffer for other protocol control related messages
+or other miscellaneous ancillary data.
+The messages are of the form:
+.Bd -literal
+struct cmsghdr {
+	socklen_t  cmsg_len;	/* data byte count, including hdr */
+	int	   cmsg_level;	/* originating protocol */
+	int	   cmsg_type;	/* protocol-specific type */
+/* followed by
+	u_char	   cmsg_data[]; */
+};
+.Ed
+.Pp
+As an example, one could use this to learn of changes in the data-stream
+in XNS/SPP, or in ISO, to obtain user-connection-request data by requesting
+a
+.Fn recvmsg
+with no data buffer provided immediately after an
+.Fn accept
+system call.
+.Pp
+Open file descriptors are now passed as ancillary data for
+.Dv AF_UNIX
+domain sockets, with
+.Fa cmsg_level
+set to
+.Dv SOL_SOCKET
+and
+.Fa cmsg_type
+set to
+.Dv SCM_RIGHTS .
+.Pp
+Process credentials can also be passed as ancillary data for
+.Dv AF_UNIX
+domain sockets using a
+.Fa cmsg_type
+of
+.Dv SCM_CREDS .
+In this case,
+.Fa cmsg_data
+should be a structure of type
+.Fa cmsgcred ,
+which is defined in
+.In sys/socket.h
+as follows:
+.Bd -literal
+struct cmsgcred {
+	pid_t	cmcred_pid;		/* PID of sending process */
+	uid_t	cmcred_uid;		/* real UID of sending process */
+	uid_t	cmcred_euid;		/* effective UID of sending process */
+	gid_t	cmcred_gid;		/* real GID of sending process */
+	short	cmcred_ngroups;		/* number or groups */
+	gid_t	cmcred_groups[CMGROUP_MAX];	/* groups */
+};
+.Ed
+.Pp
+The kernel will fill in the credential information of the sending process
+and deliver it to the receiver.
+.Pp
+The
+.Fa msg_flags
+field is set on return according to the message received.
+.Dv MSG_EOR
+indicates end-of-record;
+the data returned completed a record (generally used with sockets of type
+.Dv SOCK_SEQPACKET ) .
+.Dv MSG_TRUNC
+indicates that
+the trailing portion of a datagram was discarded because the datagram
+was larger than the buffer supplied.
+.Dv MSG_CTRUNC
+indicates that some
+control data were discarded due to lack of space in the buffer
+for ancillary data.
+.Dv MSG_OOB
+is returned to indicate that expedited or out-of-band data were received.
+.Sh RETURN VALUES
+These calls return the number of bytes received, or -1
+if an error occurred.
+.Sh ERRORS
+The calls fail if:
+.Bl -tag -width Er
+.It Bq Er EBADF
+The argument
+.Fa s
+is an invalid descriptor.
+.It Bq Er ECONNRESET
+The remote socket end is forcibly closed.
+.It Bq Er ENOTCONN
+The socket is associated with a connection-oriented protocol
+and has not been connected (see
+.Xr connect 2
+and
+.Xr accept 2 ) .
+.It Bq Er ENOTSOCK
+The argument
+.Fa s
+does not refer to a socket.
+.It Bq Er EMSGSIZE
+The
+.Fn recvmsg
+system call
+was used to receive rights (file descriptors) that were in flight on the
+connection.
+However, the receiving program did not have enough free file
+descriptor slots to accept them.
+In this case the descriptors are
+closed, any pending data can be returned by another call to
+.Fn recvmsg .
+.It Bq Er EAGAIN
+The socket is marked non-blocking, and the receive operation
+would block, or
+a receive timeout had been set,
+and the timeout expired before data were received.
+.It Bq Er EINTR
+The receive was interrupted by delivery of a signal before
+any data were available.
+.It Bq Er EFAULT
+The receive buffer pointer(s) point outside the process's
+address space.
+.El
+.Sh SEE ALSO
+.Xr fcntl 2 ,
+.Xr getsockopt 2 ,
+.Xr read 2 ,
+.Xr select 2 ,
+.Xr socket 2
+.Sh HISTORY
+The
+.Fn recv
+function appeared in
+.Bx 4.2 .
diff --git a/lib/libc/sys/rename.2 b/lib/libc/sys/rename.2
new file mode 100644
index 0000000..b98edd5
--- /dev/null
+++ b/lib/libc/sys/rename.2
@@ -0,0 +1,308 @@
+.\" Copyright (c) 1983, 1991, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"     @(#)rename.2	8.1 (Berkeley) 6/4/93
+.\" $FreeBSD$
+.\"
+.Dd April 10, 2008
+.Dt RENAME 2
+.Os
+.Sh NAME
+.Nm rename
+.Nd change the name of a file
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In stdio.h
+.Ft int
+.Fn rename "const char *from" "const char *to"
+.Ft int
+.Fn renameat "int fromfd" "const char *from" "int tofd" "const char *to"
+.Sh DESCRIPTION
+The
+.Fn rename
+system call
+causes the link named
+.Fa from
+to be renamed as
+.Fa to .
+If
+.Fa to
+exists, it is first removed.
+Both
+.Fa from
+and
+.Fa to
+must be of the same type (that is, both directories or both
+non-directories), and must reside on the same file system.
+.Pp
+The
+.Fn rename
+system call
+guarantees that if
+.Fa to
+already exists, an instance of
+.Fa to
+will always exist, even if the system should crash in
+the middle of the operation.
+.Pp
+If the final component of
+.Fa from
+is a symbolic link,
+the symbolic link is renamed,
+not the file or directory to which it points.
+.Pp
+The
+.Fn renameat
+system call is equivalent to
+.Fn rename
+except in the case where either
+.Fa from
+or
+.Fa to
+specifies a relative path.
+If
+.Fa from
+is a relative path, the file to be renamed is located
+relative to the directory associated with the file descriptor
+.Fa fromfd
+instead of the current working directory.
+If the
+.Fa to
+is a relative path, the same happens only relative to the directory associated
+with
+.Fa tofd .
+If the
+.Fn renameat
+is passed the special value
+.Dv AT_FDCWD
+in the
+.Fa fromfd
+or
+.Fa tofd
+parameter, the current working directory is used in the determination
+of the file for the respective path parameter.
+.\".Sh CAVEAT
+.\"The system can deadlock if a loop in the file system graph is present.
+.\"This loop takes the form of an entry in directory
+.\".Pa a ,
+.\"say
+.\".Pa a/foo ,
+.\"being a hard link to directory
+.\".Pa b ,
+.\"and an entry in
+.\"directory
+.\".Pa b ,
+.\"say
+.\".Pa b/bar ,
+.\"being a hard link
+.\"to directory
+.\".Pa a .
+.\"When such a loop exists and two separate processes attempt to
+.\"perform
+.\".Ql rename a/foo b/bar
+.\"and
+.\".Ql rename b/bar a/foo ,
+.\"respectively,
+.\"the system may deadlock attempting to lock
+.\"both directories for modification.
+.\"Hard links to directories should be
+.\"replaced by symbolic links by the system administrator.
+.Sh RETURN VALUES
+.Rv -std rename
+.Sh ERRORS
+The
+.Fn rename
+system call
+will fail and neither of the argument files will be
+affected if:
+.Bl -tag -width Er
+.It Bq Er ENAMETOOLONG
+A component of either pathname exceeded 255 characters,
+or the entire length of either path name exceeded 1023 characters.
+.It Bq Er ENOENT
+A component of the
+.Fa from
+path does not exist,
+or a path prefix of
+.Fa to
+does not exist.
+.It Bq Er EACCES
+A component of either path prefix denies search permission.
+.It Bq Er EACCES
+The requested link requires writing in a directory with a mode
+that denies write permission.
+.It Bq Er EACCES
+The directory pointed at by the
+.Fa from
+argument denies write permission, and the operation would move
+it to another parent directory.
+.It Bq Er EPERM
+The file pointed at by the
+.Fa from
+argument has its immutable, undeletable or append-only flag set, see the
+.Xr chflags 2
+manual page for more information.
+.It Bq Er EPERM
+The parent directory of the file pointed at by the
+.Fa from
+argument has its immutable or append-only flag set.
+.It Bq Er EPERM
+The parent directory of the file pointed at by the
+.Fa to
+argument has its immutable flag set.
+.It Bq Er EPERM
+The directory containing
+.Fa from
+is marked sticky,
+and neither the containing directory nor
+.Fa from
+are owned by the effective user ID.
+.It Bq Er EPERM
+The file pointed at by the
+.Fa to
+argument
+exists,
+the directory containing
+.Fa to
+is marked sticky,
+and neither the containing directory nor
+.Fa to
+are owned by the effective user ID.
+.It Bq Er ELOOP
+Too many symbolic links were encountered in translating either pathname.
+.It Bq Er ENOTDIR
+A component of either path prefix is not a directory.
+.It Bq Er ENOTDIR
+The
+.Fa from
+argument
+is a directory, but
+.Fa to
+is not a directory.
+.It Bq Er EISDIR
+The
+.Fa to
+argument
+is a directory, but
+.Fa from
+is not a directory.
+.It Bq Er EXDEV
+The link named by
+.Fa to
+and the file named by
+.Fa from
+are on different logical devices (file systems).
+Note that this error
+code will not be returned if the implementation permits cross-device
+links.
+.It Bq Er ENOSPC
+The directory in which the entry for the new name is being placed
+cannot be extended because there is no space left on the file
+system containing the directory.
+.It Bq Er EDQUOT
+The directory in which the entry for the new name
+is being placed cannot be extended because the
+user's quota of disk blocks on the file system
+containing the directory has been exhausted.
+.It Bq Er EIO
+An I/O error occurred while making or updating a directory entry.
+.It Bq Er EROFS
+The requested link requires writing in a directory on a read-only file
+system.
+.It Bq Er EFAULT
+Path
+points outside the process's allocated address space.
+.It Bq Er EINVAL
+The
+.Fa from
+argument
+is a parent directory of
+.Fa to ,
+or an attempt is made to rename
+.Ql .\&
+or
+.Ql \&.. .
+.It Bq Er ENOTEMPTY
+The
+.Fa to
+argument
+is a directory and is not empty.
+.El
+.Pp
+In addition to the errors returned by the
+.Fn rename ,
+the
+.Fn renameat
+may fail if:
+.Bl -tag -width Er
+.It Bq Er EBADF
+The
+.Fa from
+argument does not specify an absolute path and the
+.Fa fromfd
+argument is neither
+.Dv AT_FDCWD
+nor a valid file descriptor open for searching, or the
+.Fa to
+argument does not specify an absolute path and the
+.Fa tofd
+argument is neither
+.Dv AT_FDCWD
+nor a valid file descriptor open for searching.
+.It Bq Er ENOTDIR
+The
+.Fa from
+argument is not an absolute path and
+.Fa fromfd
+is neither
+.Dv AT_FDCWD
+nor a file descriptor associated with a directory, or the
+.Fa to
+argument is not an absolute path and
+.Fa tofd
+is neither
+.Dv AT_FDCWD
+nor a file descriptor associated with a directory.
+.El
+.Sh SEE ALSO
+.Xr chflags 2 ,
+.Xr open 2 ,
+.Xr symlink 7
+.Sh STANDARDS
+The
+.Fn rename
+system call is expected to conform to
+.St -p1003.1-96 .
+The
+.Fn renameat
+system call follows The Open Group Extended API Set 2 specification.
+.Sh HISTORY
+The
+.Fn renameat
+system call appeared in
+.Fx 8.0 .
diff --git a/lib/libc/sys/revoke.2 b/lib/libc/sys/revoke.2
new file mode 100644
index 0000000..57abdbb
--- /dev/null
+++ b/lib/libc/sys/revoke.2
@@ -0,0 +1,106 @@
+.\" Copyright (c) 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" This code is derived from software contributed to Berkeley by
+.\" Berkeley Software Design, Inc.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"     @(#)revoke.2	8.1 (Berkeley) 6/4/93
+.\" $FreeBSD$
+.\"
+.Dd June 4, 1993
+.Dt REVOKE 2
+.Os
+.Sh NAME
+.Nm revoke
+.Nd revoke file access
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In unistd.h
+.Ft int
+.Fn revoke "const char *path"
+.Sh DESCRIPTION
+The
+.Fn revoke
+system call invalidates all current open file descriptors in the system
+for the file named by
+.Fa path .
+Subsequent operations on any such descriptors
+fail, with the exceptions that a
+.Fn read
+from a character device file which has been revoked
+returns a count of zero (end of file),
+and a
+.Fn close
+system call will succeed.
+If the file is a special file for a device which is open,
+the device close function
+is called as if all open references to the file had been closed.
+.Pp
+Access to a file may be revoked only by its owner or the super user.
+The
+.Fn revoke
+system call is currently supported only for block and character special
+device files.
+It is normally used to prepare a terminal device for a new login session,
+preventing any access by a previous user of the terminal.
+.Sh RETURN VALUES
+.Rv -std revoke
+.Sh ERRORS
+Access to the named file is revoked unless one of the following:
+.Bl -tag -width Er
+.It Bq Er ENOTDIR
+A component of the path prefix is not a directory.
+.It Bq Er ENAMETOOLONG
+A component of a pathname exceeded 255 characters,
+or an entire path name exceeded 1024 characters.
+.It Bq Er ENOENT
+The named file or a component of the path name does not exist.
+.It Bq Er EACCES
+Search permission is denied for a component of the path prefix.
+.It Bq Er ELOOP
+Too many symbolic links were encountered in translating the pathname.
+.It Bq Er EFAULT
+The
+.Fa path
+argument
+points outside the process's allocated address space.
+.It Bq Er EINVAL
+The implementation does not support the
+.Fn revoke
+operation on the named file.
+.It Bq Er EPERM
+The caller is neither the owner of the file nor the super user.
+.El
+.Sh SEE ALSO
+.Xr close 2 ,
+.Xr revoke 1
+.Sh HISTORY
+The
+.Fn revoke
+system call first appeared in
+.Bx 4.3 Reno .
diff --git a/lib/libc/sys/rfork.2 b/lib/libc/sys/rfork.2
new file mode 100644
index 0000000..c0f264a
--- /dev/null
+++ b/lib/libc/sys/rfork.2
@@ -0,0 +1,194 @@
+.\"
+.\" This manual page is taken directly from Plan9, and modified to
+.\" describe the actual BSD implementation. Permission for
+.\" use of this page comes from Rob Pike <rob@plan9.att.com>.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd May 14, 2007
+.Dt RFORK 2
+.Os
+.Sh NAME
+.Nm rfork
+.Nd manipulate process resources
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In unistd.h
+.Ft pid_t
+.Fn rfork "int flags"
+.Sh DESCRIPTION
+Forking, vforking or rforking are the only ways new processes are created.
+The
+.Fa flags
+argument to
+.Fn rfork
+selects which resources of the
+invoking process (parent) are shared
+by the new process (child) or initialized to
+their default values.
+The resources include
+the open file descriptor table (which, when shared, permits processes
+to open and close files for other processes),
+and open files.
+The
+.Fa flags
+argument
+is the logical OR of some subset of:
+.Bl -tag -width ".Dv RFLINUXTHPN"
+.It Dv RFPROC
+If set a new process is created; otherwise changes affect the
+current process.
+.It Dv RFNOWAIT
+If set, the child process will be dissociated from the parent.
+Upon
+exit the child will not leave a status for the parent to collect.
+See
+.Xr wait 2 .
+.It Dv RFFDG
+If set, the invoker's file descriptor table (see
+.Xr intro 2 )
+is copied; otherwise the two processes share a
+single table.
+.It Dv RFCFDG
+If set, the new process starts with a clean file descriptor table.
+Is mutually exclusive with
+.Dv RFFDG .
+.It Dv RFTHREAD
+If set, the new process shares file descriptor to process leaders table
+with its parent.
+Only applies when neither
+.Dv RFFDG
+nor
+.Dv RFCFDG
+are set.
+.It Dv RFMEM
+If set, the kernel will force sharing of the entire address space,
+typically by sharing the hardware page table directly.
+The child
+will thus inherit and share all the segments the parent process owns,
+whether they are normally shareable or not.
+The stack segment is
+not split (both the parent and child return on the same stack) and thus
+.Fn rfork
+with the RFMEM flag may not generally be called directly from high level
+languages including C.
+May be set only with
+.Dv RFPROC .
+A helper function is provided to assist with this problem and will cause
+the new process to run on the provided stack.
+See
+.Xr rfork_thread 3
+for information.
+.It Dv RFSIGSHARE
+If set, the kernel will force sharing the sigacts structure between the
+child and the parent.
+.It Dv RFLINUXTHPN
+If set, the kernel will return SIGUSR1 instead of SIGCHILD upon thread
+exit for the child.
+This is intended to mimic certain Linux clone behaviour.
+.El
+.Pp
+File descriptors in a shared file descriptor table are kept
+open until either they are explicitly closed
+or all processes sharing the table exit.
+.Pp
+If
+.Dv RFPROC
+is set, the
+value returned in the parent process
+is the process id
+of the child process; the value returned in the child is zero.
+Without
+.Dv RFPROC ,
+the return value is zero.
+Process id's range from 1 to the maximum integer
+.Ft ( int )
+value.
+The
+.Fn rfork
+system call
+will sleep, if necessary, until required process resources are available.
+.Pp
+The
+.Fn fork
+system call
+can be implemented as a call to
+.Fn rfork "RFFDG | RFPROC"
+but is not for backwards compatibility.
+.Sh RETURN VALUES
+Upon successful completion,
+.Fn rfork
+returns a value
+of 0 to the child process and returns the process ID of the child
+process to the parent process.
+Otherwise, a value of -1 is returned
+to the parent process, no child process is created, and the global
+variable
+.Va errno
+is set to indicate the error.
+.Sh ERRORS
+The
+.Fn rfork
+system call
+will fail and no child process will be created if:
+.Bl -tag -width Er
+.It Bq Er EAGAIN
+The system-imposed limit on the total
+number of processes under execution would be exceeded.
+The limit is given by the
+.Xr sysctl 3
+MIB variable
+.Dv KERN_MAXPROC .
+(The limit is actually ten less than this
+except for the super user).
+.It Bq Er EAGAIN
+The user is not the super user, and
+the system-imposed limit
+on the total number of
+processes under execution by a single user would be exceeded.
+The limit is given by the
+.Xr sysctl 3
+MIB variable
+.Dv KERN_MAXPROCPERUID .
+.It Bq Er EAGAIN
+The user is not the super user, and
+the soft resource limit corresponding to the
+.Fa resource
+argument
+.Dv RLIMIT_NOFILE
+would be exceeded (see
+.Xr getrlimit 2 ) .
+.It Bq Er EINVAL
+Both the RFFDG and the RFCFDG flags were specified.
+.It Bq Er EINVAL
+Any flags not listed above were specified.
+.It Bq Er ENOMEM
+There is insufficient swap space for the new process.
+.El
+.Sh SEE ALSO
+.Xr fork 2 ,
+.Xr intro 2 ,
+.Xr minherit 2 ,
+.Xr vfork 2 ,
+.Xr rfork_thread 3
+.Sh HISTORY
+The
+.Fn rfork
+function first appeared in Plan9.
+.Sh BUGS
+.Fx
+does not yet implement a native
+.Fn clone
+library call, and the current pthreads implementation does not use
+.Fn rfork
+with RFMEM.
+A native port of the linux threads library,
+.Pa /usr/ports/devel/linuxthreads ,
+contains a working
+.Fn clone
+call that utilizes RFMEM.
+The
+.Xr rfork_thread 3
+function can often be used instead of
+.Fn clone .
diff --git a/lib/libc/sys/rmdir.2 b/lib/libc/sys/rmdir.2
new file mode 100644
index 0000000..597c946
--- /dev/null
+++ b/lib/libc/sys/rmdir.2
@@ -0,0 +1,118 @@
+.\" Copyright (c) 1983, 1991, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"     @(#)rmdir.2	8.1 (Berkeley) 6/4/93
+.\" $FreeBSD$
+.\"
+.Dd December 9, 2006
+.Dt RMDIR 2
+.Os
+.Sh NAME
+.Nm rmdir
+.Nd remove a directory file
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In unistd.h
+.Ft int
+.Fn rmdir "const char *path"
+.Sh DESCRIPTION
+The
+.Fn rmdir
+system call
+removes a directory file
+whose name is given by
+.Fa path .
+The directory must not have any entries other
+than
+.Ql .\&
+and
+.Ql \&.. .
+.Sh RETURN VALUES
+.Rv -std rmdir
+.Sh ERRORS
+The named file is removed unless:
+.Bl -tag -width Er
+.It Bq Er ENOTDIR
+A component of the path is not a directory.
+.It Bq Er ENAMETOOLONG
+A component of a pathname exceeded 255 characters,
+or an entire path name exceeded 1023 characters.
+.It Bq Er ENOENT
+The named directory does not exist.
+.It Bq Er ELOOP
+Too many symbolic links were encountered in translating the pathname.
+.It Bq Er ENOTEMPTY
+The named directory contains files other than
+.Ql .\&
+and
+.Ql ..\&
+in it.
+.It Bq Er EACCES
+Search permission is denied for a component of the path prefix.
+.It Bq Er EACCES
+Write permission is denied on the directory containing the link
+to be removed.
+.It Bq Er EPERM
+The directory to be removed has its immutable, undeletable or append-only flag
+set, see the
+.Xr chflags 2
+manual page for more information.
+.It Bq Er EPERM
+The parent directory of the directory to be removed has its immutable or
+append-only flag set.
+.It Bq Er EPERM
+The directory containing the directory to be removed is marked sticky,
+and neither the containing directory nor the directory to be removed
+are owned by the effective user ID.
+.It Bq Er EINVAL
+The last component of the path is
+.Ql .\&
+or
+.Ql .. .
+.It Bq Er EBUSY
+The directory to be removed is the mount point
+for a mounted file system.
+.It Bq Er EIO
+An I/O error occurred while deleting the directory entry
+or deallocating the inode.
+.It Bq Er EROFS
+The directory entry to be removed resides on a read-only file system.
+.It Bq Er EFAULT
+The
+.Fa path
+argument
+points outside the process's allocated address space.
+.El
+.Sh SEE ALSO
+.Xr mkdir 2 ,
+.Xr unlink 2
+.Sh HISTORY
+The
+.Fn rmdir
+system call appeared in
+.Bx 4.2 .
diff --git a/lib/libc/sys/rtprio.2 b/lib/libc/sys/rtprio.2
new file mode 100644
index 0000000..afed81e
--- /dev/null
+++ b/lib/libc/sys/rtprio.2
@@ -0,0 +1,126 @@
+.\" Copyright (c) 1994, Henrik Vestergaard Draboel
+.\" All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 3. All advertising materials mentioning features or use of this software
+.\"    must display the following acknowledgement:
+.\" 	This product includes software developed by Henrik Vestergaard Draboel.
+.\" 4. The name of the author may not be used to endorse or promote products
+.\"    derived from this software without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd July 23, 1994
+.Dt RTPRIO 2
+.Os
+.Sh NAME
+.Nm rtprio
+.Nd examine or modify a process realtime or idle priority
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In sys/types.h
+.In sys/rtprio.h
+.Ft int
+.Fn rtprio "int function" "pid_t pid" "struct rtprio *rtp"
+.Sh DESCRIPTION
+The
+.Fn rtprio
+system call
+is used to lookup or change the realtime or idle priority of a process.
+.Pp
+The
+.Fa function
+argument
+specifies the operation to be performed.
+RTP_LOOKUP to lookup the current priority,
+and RTP_SET to set the priority.
+The
+.Fa pid
+argument
+specifies the process to be used, 0 for the current process.
+.Pp
+The
+.Fa *rtp
+argument
+is a pointer to a struct rtprio which is used to specify the priority and priority type.
+This structure has the following form:
+.Bd -literal
+struct rtprio {
+	u_short	type;
+	u_short prio;
+};
+.Ed
+.Pp
+The value of the
+.Va type
+field may be RTP_PRIO_REALTIME for realtime priorities,
+RTP_PRIO_NORMAL for normal priorities, and RTP_PRIO_IDLE for idle priorities.
+The priority specified by the
+.Va prio
+field ranges between 0 and
+.Dv RTP_PRIO_MAX (usually 31) .
+0 is the highest possible priority.
+.Pp
+Realtime and idle priority is inherited through fork() and exec().
+.Pp
+A realtime process can only be preempted by a process of equal or
+higher priority, or by an interrupt; idle priority processes will run only
+when no other real/normal priority process is runnable.
+Higher real/idle priority processes
+preempt lower real/idle priority processes.
+Processes of equal real/idle priority are run round-robin.
+.Sh RETURN VALUES
+.Rv -std rtprio
+.Sh ERRORS
+The
+.Fn rtprio
+system call
+will fail if
+.Bl -tag -width Er
+.It Bq Er EINVAL
+The specified
+.Fa prio
+was out of range.
+.It Bq Er EPERM
+The calling process is not allowed to set the realtime priority.
+Only
+root is allowed to change the realtime priority of any process, and non-root
+may only change the idle priority of the current process.
+.It Bq Er ESRCH
+The specified process was not found.
+.El
+.Sh SEE ALSO
+.Xr nice 1 ,
+.Xr ps 1 ,
+.Xr rtprio 1 ,
+.Xr setpriority 2 ,
+.Xr nice 3 ,
+.Xr renice 8
+.Sh AUTHORS
+.An -nosplit
+The original author was
+.An Henrik Vestergaard Draboel Aq hvd@terry.ping.dk .
+This implementation in
+.Fx
+was substantially rewritten by
+.An David Greenman .
diff --git a/lib/libc/sys/sched_get_priority_max.2 b/lib/libc/sys/sched_get_priority_max.2
new file mode 100644
index 0000000..88d1d6d
--- /dev/null
+++ b/lib/libc/sys/sched_get_priority_max.2
@@ -0,0 +1,123 @@
+.\" Copyright (c) 1998 HD Associates, Inc.
+.\" All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd March 12, 1998
+.Dt SCHED_GET_PRIORITY_MAX 2
+.Os
+.Sh NAME
+.Nm sched_get_priority_max ,
+.Nm sched_get_priority_min ,
+.Nm sched_rr_get_interval
+.Nd get scheduling parameter limits
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In sched.h
+.Ft int
+.Fn sched_get_priority_max "int policy"
+.Ft int
+.Fn sched_get_priority_min "int policy"
+.Ft int
+.Fn sched_rr_get_interval "pid_t pid" "struct timespec *interval"
+.Sh DESCRIPTION
+The
+.Fn sched_get_priority_max
+and
+.Fn sched_get_priority_min
+system calls return the appropriate maximum or minimum, respectively,
+for the scheduling policy specified by
+.Fa policy .
+The
+.Fn sched_rr_get_interval
+system call updates the
+.Fa timespec
+structure referenced by the
+.Fa interval
+argument to contain the current execution time limit (i.e., time
+quantum) for the process specified by
+.Fa pid .
+If
+.Fa pid
+is zero, the current execution time limit for the calling process is
+returned.
+.Pp
+The value of
+.Fa policy
+should be one of the scheduling policy values defined in
+.Fa <sched.h> :
+.Bl -tag -width [SCHED_OTHER]
+.It Bq Er SCHED_FIFO
+First-in-first-out fixed priority scheduling with no round robin scheduling;
+.It Bq Er SCHED_OTHER
+The standard time sharing scheduler;
+.It Bq Er SCHED_RR
+Round-robin scheduling across same priority processes.
+.El
+.Sh RETURN VALUES
+If successful, the
+.Fn sched_get_priority_max
+and
+.Fn sched_get_priority_min
+system calls shall return the appropriate maximum or minimum values,
+respectively.
+If unsuccessful, they shall return a value of -1 and set
+.Fa errno
+to indicate the error.
+.Pp
+.Rv -std sched_rr_get_interval
+.Sh ERRORS
+On failure
+.Va errno
+will be set to the corresponding value:
+.Bl -tag -width Er
+.It Bq Er EINVAL
+The value of the
+.Fa policy
+argument does not represent a defined scheduling policy.
+.It Bq Er ENOSYS
+The
+.Fn sched_get_priority_max ,
+.Fn sched_get_priority_min ,
+and
+.Fn sched_rr_get_interval
+system calls are not supported by the implementation.
+.It Bq Er ESRCH
+No process can be found corresponding to that specified by
+.Fa pid .
+.El
+.Sh SEE ALSO
+.Xr sched_getparam 2 ,
+.Xr sched_getscheduler 2 ,
+.Xr sched_setparam 2 ,
+.Xr sched_setscheduler 2
+.Sh STANDARDS
+The
+.Fn sched_get_priority_max ,
+.Fn sched_get_priority_min ,
+and
+.Fn sched_rr_get_interval
+system calls conform to
+.St -p1003.1b-93 .
diff --git a/lib/libc/sys/sched_setparam.2 b/lib/libc/sys/sched_setparam.2
new file mode 100644
index 0000000..315fd82
--- /dev/null
+++ b/lib/libc/sys/sched_setparam.2
@@ -0,0 +1,174 @@
+.\" $FreeBSD$
+.\" Copyright (c) 1998 HD Associates, Inc.
+.\" All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.Dd March 12, 1998
+.Dt SCHED_SETPARAM 2
+.Os
+.Sh NAME
+.Nm sched_setparam ,
+.Nm sched_getparam
+.Nd set/get scheduling parameters
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In sched.h
+.Ft int
+.Fn sched_setparam "pid_t pid" "const struct sched_param *param"
+.Ft int
+.Fn sched_getparam "pid_t pid" "struct sched_param *param"
+.Sh DESCRIPTION
+The
+.Fn sched_setparam
+system call sets the scheduling parameters of the process specified by
+.Fa pid
+to the values specified by the
+.Fa sched_param
+structure pointed to by
+.Fa param .
+The value of the
+.Fa sched_priority
+member in the
+.Fa param
+structure must be any integer within the inclusive priority range for
+the current scheduling policy of the process specified by
+.Fa pid .
+Higher numerical values for the priority represent higher priorities.
+.Pp
+In this implementation, if the value of
+.Fa pid
+is negative the system call will fail.
+.Pp
+If a process specified by
+.Fa pid
+exists and if the calling process has permission, the scheduling
+parameters are set for the process whose process ID is equal to
+.Fa pid .
+.Pp
+If
+.Fa pid
+is zero, the scheduling parameters are set for the calling process.
+.Pp
+In this implementation, the policy of when a process can affect
+the scheduling parameters of another process is specified in
+.St -p1003.1b-93
+as a write-style operation.
+.Pp
+The target process, whether it is running or not running, will resume
+execution after all other runnable processes of equal or greater
+priority have been scheduled to run.
+.Pp
+If the priority of the process specified by the
+.Fa pid
+argument is set higher than that of the lowest priority running process
+and if the specified process is ready to run, the process specified by
+the
+.Fa pid
+argument will preempt a lowest priority running process.
+Similarly, if
+the process calling
+.Fn sched_setparam
+sets its own priority lower than that of one or more other nonempty
+process lists, then the process that is the head of the highest priority
+list will also preempt the calling process.
+Thus, in either case, the
+originating process might not receive notification of the completion of
+the requested priority change until the higher priority process has
+executed.
+.Pp
+In this implementation, when the current scheduling policy for the
+process specified by
+.Fa pid
+is normal timesharing (SCHED_OTHER, aka SCHED_NORMAL when not POSIX-source)
+or the idle policy (SCHED_IDLE when not POSIX-source) then the behavior
+is as if the process had been running under SCHED_RR with a priority
+lower than any actual realtime priority.
+.Pp
+The
+.Fn sched_getparam
+system call will return the scheduling parameters of a process specified
+by
+.Fa pid
+in the
+.Fa sched_param
+structure pointed to by
+.Fa param .
+.Pp
+If a process specified by
+.Fa pid
+exists and if the calling process has permission,
+the scheduling parameters for the process whose process ID is equal to
+.Fa pid
+are returned.
+.Pp
+In this implementation, the policy of when a process can obtain the
+scheduling parameters of another process are detailed in
+.St -p1003.1b-93
+as a read-style operation.
+.Pp
+If
+.Fa pid
+is zero, the scheduling parameters for the calling process will be
+returned.
+In this implementation, the
+.Fa sched_getparam
+system call will fail if
+.Fa pid
+is negative.
+.Sh RETURN VALUES
+.Rv -std
+.Sh ERRORS
+On failure
+.Va errno
+will be set to the corresponding value:
+.Bl -tag -width Er
+.It Bq Er ENOSYS
+The system is not configured to support this functionality.
+.It Bq Er EPERM
+The requesting process doesn not have permission as detailed in
+.St -p1003.1b-93 .
+.It Bq Er ESRCH
+No process can be found corresponding to that specified by
+.Fa pid .
+.It Bq Er EINVAL
+For
+.Fn sched_setparam :
+one or more of the requested scheduling parameters
+is outside the range defined for the scheduling policy of the specified
+.Fa pid .
+.El
+.Sh SEE ALSO
+.Xr sched_get_priority_max 2 ,
+.Xr sched_get_priority_min 2 ,
+.Xr sched_getscheduler 2 ,
+.Xr sched_rr_get_interval 2 ,
+.Xr sched_setscheduler 2 ,
+.Xr sched_yield 2
+.Sh STANDARDS
+The
+.Fn sched_setparam
+and
+.Fn sched_getparam
+system calls conform to
+.St -p1003.1b-93 .
diff --git a/lib/libc/sys/sched_setscheduler.2 b/lib/libc/sys/sched_setscheduler.2
new file mode 100644
index 0000000..3e7c42b
--- /dev/null
+++ b/lib/libc/sys/sched_setscheduler.2
@@ -0,0 +1,166 @@
+.\" $FreeBSD$
+.\" Copyright (c) 1998 HD Associates, Inc.
+.\" All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.Dd March 12, 1998
+.Dt SCHED_SETSCHEDULER 2
+.Os
+.Sh NAME
+.Nm sched_setscheduler ,
+.Nm sched_getscheduler
+.Nd set/get scheduling policy and scheduler parameters
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In sched.h
+.Ft int
+.Fn sched_setscheduler "pid_t pid" "int policy" "const struct sched_param *param"
+.Ft int
+.Fn sched_getscheduler "pid_t pid"
+.Sh DESCRIPTION
+The
+.Fn sched_setscheduler
+system call sets the scheduling policy and scheduling parameters
+of the process specified by
+.Fa pid
+to
+.Fa policy
+and the parameters specified in the
+.Vt sched_param
+structure pointed to by
+.Fa param ,
+respectively.
+The value of the
+.Fa sched_priority
+member in the
+.Fa param
+structure must be any integer within the inclusive priority range for
+the scheduling policy specified by
+.Fa policy .
+.Pp
+In this implementation, if the value of
+.Fa pid
+is negative the system call will fail.
+.Pp
+If a process specified by
+.Fa pid
+exists and if the calling process has permission, the scheduling
+policy and scheduling parameters will be set for the process
+whose process ID is equal to
+.Fa pid .
+.Pp
+If
+.Fa pid
+is zero, the scheduling policy and scheduling
+parameters are set for the calling process.
+.Pp
+In this implementation, the policy of when a process can affect
+the scheduling parameters of another process is specified in
+.St -p1003.1b-93
+as a write-style operation.
+.Pp
+The scheduling policies are in
+.Fa <sched.h> :
+.Bl -tag -width [SCHED_OTHER]
+.It Bq Er SCHED_FIFO
+First-in-first-out fixed priority scheduling with no round robin scheduling;
+.It Bq Er SCHED_OTHER
+The standard time sharing scheduler;
+.It Bq Er SCHED_RR
+Round-robin scheduling across same priority processes.
+.El
+.Pp
+The
+.Vt sched_param
+structure is defined in
+.Fa <sched.h> :
+.Bd -literal -offset indent
+struct sched_param {
+	int sched_priority;	/* scheduling priority */
+};
+.Ed
+.Pp
+The
+.Fn sched_getscheduler
+system call returns the scheduling policy of the process specified
+by
+.Fa pid .
+.Pp
+If a process specified by
+.Fa pid
+exists and if the calling process has permission,
+the scheduling parameters for the process whose process ID is equal to
+.Fa pid
+are returned.
+.Pp
+In this implementation, the policy of when a process can obtain the
+scheduling parameters of another process are detailed in
+.St -p1003.1b-93
+as a read-style operation.
+.Pp
+If
+.Fa pid
+is zero, the scheduling parameters for the calling process will be
+returned.
+In this implementation, the
+.Fa sched_getscheduler
+system call will fail if
+.Fa pid
+is negative.
+.Sh RETURN VALUES
+.Rv -std
+.Sh ERRORS
+On failure
+.Va errno
+will be set to the corresponding value:
+.Bl -tag -width Er
+.It Bq Er ENOSYS
+The system is not configured to support this functionality.
+.It Bq Er EPERM
+The requesting process doesn not have permission as detailed in
+.St -p1003.1b-93 .
+.It Bq Er ESRCH
+No process can be found corresponding to that specified by
+.Fa pid .
+.It Bq Er EINVAL
+The value of the
+.Fa policy
+argument is invalid, or one or more of the parameters contained in
+.Fa param
+is outside the valid range for the specified scheduling policy.
+.El
+.Sh SEE ALSO
+.Xr sched_getparam 2 ,
+.Xr sched_get_priority_max 2 ,
+.Xr sched_get_priority_min 2 ,
+.Xr sched_rr_get_interval 2 ,
+.Xr sched_setparam 2 ,
+.Xr sched_yield 2
+.Sh STANDARDS
+The
+.Fn sched_setscheduler
+and
+.Fn sched_getscheduler
+system calls conform to
+.St -p1003.1b-93 .
diff --git a/lib/libc/sys/sched_yield.2 b/lib/libc/sys/sched_yield.2
new file mode 100644
index 0000000..9db8942
--- /dev/null
+++ b/lib/libc/sys/sched_yield.2
@@ -0,0 +1,58 @@
+.\" $FreeBSD$
+.\" Copyright (c) 1998 HD Associates, Inc.
+.\" All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.Dd March 12, 1998
+.Dt SCHED_YIELD 2
+.Os
+.Sh NAME
+.Nm sched_yield
+.Nd yield processor
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In sched.h
+.Ft int
+.Fn sched_yield void
+.Sh DESCRIPTION
+The
+.Fn sched_yield
+system call forces the running process to relinquish the processor until it
+again becomes the head of its process list.
+It takes no arguments.
+.Sh RETURN VALUES
+.Rv -std sched_yield
+.Sh ERRORS
+On failure
+.Va errno
+will be set to the corresponding value:
+.Bl -tag -width Er
+.It Bq Er ENOSYS
+The system is not configured to support this functionality.
+.El
+.Sh STANDARDS
+The
+.Fn sched_yield
+system call conforms to
+.St -p1003.1b-93 .
diff --git a/lib/libc/sys/sctp_generic_recvmsg.2 b/lib/libc/sys/sctp_generic_recvmsg.2
new file mode 100644
index 0000000..d6fd1b5
--- /dev/null
+++ b/lib/libc/sys/sctp_generic_recvmsg.2
@@ -0,0 +1,78 @@
+.\" Copyright (c) 1983, 1991, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 3. All advertising materials mentioning features or use of this software
+.\"    must display the following acknowledgement:
+.\"	This product includes software developed by the University of
+.\"	California, Berkeley and its contributors.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd October 30, 2007
+.Dt SCTP_GENERIC_RECVMSG 2
+.Os
+.Sh NAME
+.Nm sctp_generic_recvmsg
+.Nd receive data from a peer
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In sys/types.h
+.In sys/socket.h
+.In netinet/sctp.h
+.Ft int
+.Fn sctp_generic_recvmsg "int s" "struct iovec *iov" "int iovlen" "struct sockaddr *from" "socklen_t *fromlen" "struct sctp_sndrcvinfo *sinfo" "int *msgflags"
+.Sh DESCRIPTION
+.Fn sctp_generic_recvmsg
+is the true system call used by the
+.Xr sctp_recvmsg 3
+function call.
+This call is more efficient since it is a
+true system call but it is specific to
+.Fx
+and can be expected
+.Em not
+to be present on any other operating
+system.
+For detailed usage please see the
+.Xr sctp_recvmsg 3
+function call.
+.Sh RETURN VALUES
+The call returns the number of bytes read on success and -1 upon failure.
+.Sh ERRORS
+.Bl -tag -width Er
+.It Bq Er EBADF
+The argument
+.Fa s
+is not a valid descriptor.
+.It Bq Er ENOTSOCK
+The argument
+.Fa s
+is not a socket.
+.El
+.Sh SEE ALSO
+.Xr sctp_recvmsg 3 ,
+.Xr sctp 4
diff --git a/lib/libc/sys/sctp_generic_sendmsg.2 b/lib/libc/sys/sctp_generic_sendmsg.2
new file mode 100644
index 0000000..fee4211
--- /dev/null
+++ b/lib/libc/sys/sctp_generic_sendmsg.2
@@ -0,0 +1,90 @@
+.\" Copyright (c) 1983, 1991, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 3. All advertising materials mentioning features or use of this software
+.\"    must display the following acknowledgement:
+.\"	This product includes software developed by the University of
+.\"	California, Berkeley and its contributors.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd October 30, 2007
+.Dt SCTP_GENERIC_SENDMSG 2
+.Os
+.Sh NAME
+.Nm sctp_generic_sendmsg
+.Nm sctp_generic_sendmsg_iov
+.Nd send data to a peer
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In sys/types.h
+.In sys/socket.h
+.In netinet/sctp.h
+.Ft int
+.Fn sctp_generic_sendmsg "int s" "void *msg" "int msglen" "struct sockaddr *to" "socklen_t len" "struct sctp_sndrcvinfo *sinfo" "int flags"
+.Ft int
+.Fn sctp_generic_sendmsg_iov "int s" "struct iovec *iov" "int iovlen" "struct sockaddr *to" "struct sctp_sndrcvinfo *sinfo" "int flags"
+.Sh DESCRIPTION
+.Fn sctp_generic_sendmsg
+and
+.Fn sctp_generic_sendmsg_iov
+are the true system calls used by the
+.Xr sctp_sendmsg 3
+and 
+.Xr sctp_send 3
+function calls.
+These are more efficient since they are
+true system calls but they are specific to
+.Fx
+and can be expected
+.Em not
+to be present on any other operating
+system.
+For detailed usage please see either the
+.Xr sctp_send 3
+or
+.Xr sctp_sendmsg 3
+function calls. 
+.Sh RETURN VALUES
+The call returns the number of bytes written on success and -1 upon failure.
+.Sh ERRORS
+.Bl -tag -width Er
+.It Bq Er EBADF
+The argument
+.Fa s
+is not a valid descriptor.
+.It Bq Er ENOTSOCK
+The argument
+.Fa s
+is not a socket.
+.El
+.Sh SEE ALSO
+.Xr sctp_send 3 ,
+.Xr sctp_sendmsg 3 ,
+.Xr sctp_sendmsgx 3 ,
+.Xr sctp_sendx 3 ,
+.Xr sctp 4
diff --git a/lib/libc/sys/sctp_peeloff.2 b/lib/libc/sys/sctp_peeloff.2
new file mode 100644
index 0000000..d94f280
--- /dev/null
+++ b/lib/libc/sys/sctp_peeloff.2
@@ -0,0 +1,81 @@
+.\" Copyright (c) 1983, 1991, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 3. All advertising materials mentioning features or use of this software
+.\"    must display the following acknowledgement:
+.\"	This product includes software developed by the University of
+.\"	California, Berkeley and its contributors.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd October 30, 2007
+.Dt SCTP_PEELOFF 2
+.Os
+.Sh NAME
+.Nm sctp_peeloff
+.Nd detach an association from a one-to-many socket to its own fd
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In sys/types.h
+.In sys/socket.h
+.In netinet/sctp.h
+.Ft int
+.Fn sctp_peeloff "int s" "sctp_assoc_t id"
+.Sh DESCRIPTION
+The
+.Fn sctp_peeloff
+system call attempts detach the association specified by
+.Fa id
+into its own separate socket.
+.Pp
+.Sh RETURN VALUES
+The call returns -1 on failure and the new socket descriptor
+upon success.
+.Sh ERRORS
+The
+.Fn sctp_peeloff
+system call can return the following errors:
+.Bl -tag -width Er
+.It Bq Er ENOTCONN
+The 
+.Fa id
+given to the call does not map to a valid
+association.
+.It Bq Er E2BIG
+The size of the address list exceeds the amount of
+data provided.
+.It Bq Er EBADF
+The argument
+.Fa s
+is not a valid descriptor.
+.It Bq Er ENOTSOCK
+The argument
+.Fa s
+is not a socket.
+.El
+.Sh SEE ALSO
+.Xr sctp 4
diff --git a/lib/libc/sys/select.2 b/lib/libc/sys/select.2
new file mode 100644
index 0000000..2435e37
--- /dev/null
+++ b/lib/libc/sys/select.2
@@ -0,0 +1,227 @@
+.\" Copyright (c) 1983, 1991, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"     @(#)select.2	8.2 (Berkeley) 3/25/94
+.\" $FreeBSD$
+.\"
+.Dd November 17, 2002
+.Dt SELECT 2
+.Os
+.Sh NAME
+.Nm select
+.Nd synchronous I/O multiplexing
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In sys/select.h
+.Ft int
+.Fn select "int nfds" "fd_set *readfds" "fd_set *writefds" "fd_set *exceptfds" "struct timeval *timeout"
+.Fn FD_SET fd &fdset
+.Fn FD_CLR fd &fdset
+.Fn FD_ISSET fd &fdset
+.Fn FD_ZERO &fdset
+.Sh DESCRIPTION
+The
+.Fn select
+system call
+examines the I/O descriptor sets whose addresses are passed in
+.Fa readfds ,
+.Fa writefds ,
+and
+.Fa exceptfds
+to see if some of their descriptors
+are ready for reading, are ready for writing, or have an exceptional
+condition pending, respectively.
+The only exceptional condition detectable is out-of-band
+data received on a socket.
+The first
+.Fa nfds
+descriptors are checked in each set;
+i.e., the descriptors from 0 through
+.Fa nfds Ns No -1
+in the descriptor sets are examined.
+On return,
+.Fn select
+replaces the given descriptor sets
+with subsets consisting of those descriptors that are ready
+for the requested operation.
+The
+.Fn select
+system call
+returns the total number of ready descriptors in all the sets.
+.Pp
+The descriptor sets are stored as bit fields in arrays of integers.
+The following macros are provided for manipulating such descriptor sets:
+.Fn FD_ZERO &fdset
+initializes a descriptor set
+.Fa fdset
+to the null set.
+.Fn FD_SET fd &fdset
+includes a particular descriptor
+.Fa fd
+in
+.Fa fdset .
+.Fn FD_CLR fd &fdset
+removes
+.Fa fd
+from
+.Fa fdset .
+.Fn FD_ISSET fd &fdset
+is non-zero if
+.Fa fd
+is a member of
+.Fa fdset ,
+zero otherwise.
+The behavior of these macros is undefined if
+a descriptor value is less than zero or greater than or equal to
+.Dv FD_SETSIZE ,
+which is normally at least equal
+to the maximum number of descriptors supported by the system.
+.Pp
+If
+.Fa timeout
+is not a null pointer, it specifies the maximum interval to wait for the
+selection to complete.
+System activity can lengthen the interval by
+an indeterminate amount.
+.Pp
+If
+.Fa timeout
+is a null pointer, the select blocks indefinitely.
+.Pp
+To effect a poll, the
+.Fa timeout
+argument should not be a null pointer,
+but it should point to a zero-valued timeval structure.
+.Pp
+Any of
+.Fa readfds ,
+.Fa writefds ,
+and
+.Fa exceptfds
+may be given as null pointers if no descriptors are of interest.
+.Sh RETURN VALUES
+The
+.Fn select
+system call
+returns the number of ready descriptors that are contained in
+the descriptor sets,
+or -1 if an error occurred.
+If the time limit expires,
+.Fn select
+returns 0.
+If
+.Fn select
+returns with an error,
+including one due to an interrupted system call,
+the descriptor sets will be unmodified.
+.Sh ERRORS
+An error return from
+.Fn select
+indicates:
+.Bl -tag -width Er
+.It Bq Er EBADF
+One of the descriptor sets specified an invalid descriptor.
+.It Bq Er EFAULT
+One of the arguments
+.Fa readfds , writefds , exceptfds ,
+or
+.Fa timeout
+points to an invalid address.
+.It Bq Er EINTR
+A signal was delivered before the time limit expired and
+before any of the selected events occurred.
+.It Bq Er EINVAL
+The specified time limit is invalid.
+One of its components is
+negative or too large.
+.It Bq Er EINVAL
+The
+.Fa nfds
+argument
+was invalid.
+.El
+.Sh SEE ALSO
+.Xr accept 2 ,
+.Xr connect 2 ,
+.Xr getdtablesize 2 ,
+.Xr gettimeofday 2 ,
+.Xr kqueue 2 ,
+.Xr poll 2 ,
+.Xr read 2 ,
+.Xr recv 2 ,
+.Xr send 2 ,
+.Xr write 2 ,
+.Xr clocks 7
+.Sh NOTES
+The default size of
+.Dv FD_SETSIZE
+is currently 1024.
+In order to accommodate programs which might potentially
+use a larger number of open files with
+.Fn select ,
+it is possible
+to increase this size by having the program define
+.Dv FD_SETSIZE
+before the inclusion of any header which includes
+.In sys/types.h .
+.Pp
+If
+.Fa nfds
+is greater than the number of open files,
+.Fn select
+is not guaranteed to examine the unused file descriptors.
+For historical
+reasons,
+.Fn select
+will always examine the first 256 descriptors.
+.Sh STANDARDS
+The
+.Fn select
+system call and
+.Fn FD_CLR ,
+.Fn FD_ISSET ,
+.Fn FD_SET ,
+and
+.Fn FD_ZERO
+macros conform with
+.St -p1003.1-2001 .
+.Sh HISTORY
+The
+.Fn select
+system call appeared in
+.Bx 4.2 .
+.Sh BUGS
+.St -susv2
+allows systems to modify the original timeout in place.
+Thus, it is unwise to assume that the timeout value will be unmodified
+by the
+.Fn select
+system call.
+.Fx 
+does not modify the return value, which can cause problems for applications
+ported from other systems.
diff --git a/lib/libc/sys/semctl.2 b/lib/libc/sys/semctl.2
new file mode 100644
index 0000000..adfb9ef
--- /dev/null
+++ b/lib/libc/sys/semctl.2
@@ -0,0 +1,200 @@
+.\"
+.\" Copyright (c) 1995 David Hovemeyer <daveho@infocom.com>
+.\"
+.\" All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY EXPRESS OR
+.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+.\" IN NO EVENT SHALL THE DEVELOPERS BE LIABLE FOR ANY DIRECT, INDIRECT,
+.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd September 12, 1995
+.Dt SEMCTL 2
+.Os
+.Sh NAME
+.Nm semctl
+.Nd control operations on a semaphore set
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In sys/types.h
+.In sys/ipc.h
+.In sys/sem.h
+.Ft int
+.Fn semctl "int semid" "int semnum" "int cmd" ...
+.Sh DESCRIPTION
+The
+.Fn semctl
+system call
+performs the operation indicated by
+.Fa cmd
+on the semaphore set indicated by
+.Fa semid .
+A fourth argument, a
+.Fa "union semun arg" ,
+is required for certain values of
+.Fa cmd .
+For the commands that use the
+.Fa arg
+argument,
+.Fa "union semun"
+is defined as follows:
+.\"
+.\" From <sys/sem.h>:
+.\"
+.Bd -literal
+union semun {
+        int     val;            /* value for SETVAL */
+        struct  semid_ds *buf;  /* buffer for IPC_STAT & IPC_SET */
+        u_short *array;         /* array for GETALL & SETALL */
+};
+.Ed
+.Pp
+Commands are performed as follows:
+.\"
+.\" This section based on Stevens, _Advanced Programming in the UNIX
+.\" Environment_.
+.\"
+.Bl -tag -width IPC_RMIDXXX
+.It Dv IPC_STAT
+Fetch the semaphore set's
+.Fa "struct semid_ds" ,
+storing it in the memory pointed to by
+.Fa arg.buf .
+.It Dv IPC_SET
+Changes the
+.Fa sem_perm.uid ,
+.Fa sem_perm.gid ,
+and
+.Fa sem_perm.mode
+members of the semaphore set's
+.Fa "struct semid_ds"
+to match those of the struct pointed to by
+.Fa arg.buf .
+The calling process's effective uid must
+match either
+.Fa sem_perm.uid
+or
+.Fa sem_perm.cuid ,
+or it must have superuser privileges.
+.It IPC_RMID
+Immediately removes the semaphore set from the system.
+The calling
+process's effective uid must equal the semaphore set's
+.Fa sem_perm.uid
+or
+.Fa sem_perm.cuid ,
+or the process must have superuser privileges.
+.It Dv GETVAL
+Return the value of semaphore number
+.Fa semnum .
+.It Dv SETVAL
+Set the value of semaphore number
+.Fa semnum
+to
+.Fa arg.val .
+Outstanding adjust on exit values for this semaphore in any process
+are cleared.
+.It Dv GETPID
+Return the pid of the last process to perform an operation on
+semaphore number
+.Fa semnum .
+.It Dv GETNCNT
+Return the number of processes waiting for semaphore number
+.Fa semnum Ns 's
+value to become greater than its current value.
+.It Dv GETZCNT
+Return the number of processes waiting for semaphore number
+.Fa semnum Ns 's
+value to become 0.
+.It Dv GETALL
+Fetch the value of all of the semaphores in the set into the
+array pointed to by
+.Fa arg.array .
+.It Dv SETALL
+Set the values of all of the semaphores in the set to the values
+in the array pointed to by
+.Fa arg.array .
+Outstanding adjust on exit values for all semaphores in this set,
+in any process are cleared.
+.El
+.Pp
+The
+.Vt "struct semid_ds"
+is defined as follows:
+.\"
+.\" Taken straight from <sys/sem.h>.
+.\"
+.Bd -literal
+struct semid_ds {
+        struct  ipc_perm sem_perm;      /* operation permission struct */
+        struct  sem *sem_base;  /* pointer to first semaphore in set */
+        u_short sem_nsems;      /* number of sems in set */
+        time_t  sem_otime;      /* last operation time */
+        time_t  sem_ctime;      /* last change time */
+                                /* Times measured in secs since */
+                                /* 00:00:00 GMT, Jan. 1, 1970 */
+};
+.Ed
+.Sh RETURN VALUES
+On success, when
+.Fa cmd
+is one of
+.Dv GETVAL , GETPID , GETNCNT
+or
+.Dv GETZCNT ,
+.Fn semctl
+returns the corresponding value; otherwise, 0 is returned.
+On failure, -1 is returned, and
+.Va errno
+is set to indicate the error.
+.Sh ERRORS
+The
+.Fn semctl
+system call
+will fail if:
+.Bl -tag -width Er
+.It Bq Er EINVAL
+No semaphore set corresponds to
+.Fa semid .
+.It Bq Er EINVAL
+The
+.Fa semnum
+argument
+is not in the range of valid semaphores for given semaphore set.
+.It Bq Er EPERM
+The calling process's effective uid does not match the uid of
+the semaphore set's owner or creator.
+.It Bq Er EACCES
+Permission denied due to mismatch between operation and mode of
+semaphore set.
+.It Bq Er ERANGE
+.Dv SETVAL
+or
+.Dv SETALL
+attempted to set a semaphore outside the allowable range
+.Bq 0 .. Dv SEMVMX .
+.El
+.Sh SEE ALSO
+.Xr semget 2 ,
+.Xr semop 2
+.Sh BUGS
+.Dv SETALL
+may update some semaphore elements before returning an error.
diff --git a/lib/libc/sys/semget.2 b/lib/libc/sys/semget.2
new file mode 100644
index 0000000..945044d
--- /dev/null
+++ b/lib/libc/sys/semget.2
@@ -0,0 +1,148 @@
+.\"
+.\" Copyright (c) 1995 David Hovemeyer <daveho@infocom.com>
+.\"
+.\" All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY EXPRESS OR
+.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+.\" IN NO EVENT SHALL THE DEVELOPERS BE LIABLE FOR ANY DIRECT, INDIRECT,
+.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd September 12, 1995
+.Dt SEMGET 2
+.Os
+.Sh NAME
+.Nm semget
+.Nd obtain a semaphore id
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In sys/types.h
+.In sys/ipc.h
+.In sys/sem.h
+.Ft int
+.Fn semget "key_t key" "int nsems" "int flag"
+.Sh DESCRIPTION
+Based on the values of
+.Fa key
+and
+.Fa flag ,
+.Fn semget
+returns the identifier of a newly created or previously existing
+set of semaphores.
+.\"
+.\" This is copied verbatim from the shmget manpage.  Perhaps
+.\" it should go in a common manpage, such as .Xr ipc 2
+.\"
+The key
+is analogous to a filename: it provides a handle that names an
+IPC object.
+There are three ways to specify a key:
+.Bl -bullet
+.It
+IPC_PRIVATE may be specified, in which case a new IPC object
+will be created.
+.It
+An integer constant may be specified.
+If no IPC object corresponding
+to
+.Fa key
+is specified and the IPC_CREAT bit is set in
+.Fa flag ,
+a new one will be created.
+.It
+The
+.Xr ftok 3
+function
+may be used to generate a key from a pathname.
+.El
+.\"
+.\" Likewise for this section, except SHM_* becomes SEM_*.
+.\"
+.Pp
+The mode of a newly created IPC object is determined by
+.Em OR Ns 'ing
+the following constants into the
+.Fa flag
+argument:
+.Bl -tag -width XSEM_WXX6XXX
+.It Dv SEM_R
+Read access for user.
+.It Dv SEM_A
+Alter access for user.
+.It Dv ( SEM_R>>3 )
+Read access for group.
+.It Dv ( SEM_A>>3 )
+Alter access for group.
+.It Dv ( SEM_R>>6 )
+Read access for other.
+.It Dv ( SEM_A>>6 )
+Alter access for other.
+.El
+.Pp
+If a new set of semaphores is being created,
+.Fa nsems
+is used to indicate the number of semaphores the set should contain.
+Otherwise,
+.Fa nsems
+may be specified as 0.
+.Sh RETURN VALUES
+The
+.Fn semget
+system call
+returns the id of a semaphore set if successful; otherwise, -1
+is returned and
+.Va errno
+is set to indicate the error.
+.Sh ERRORS
+The
+.Fn semget
+system call
+will fail if:
+.Bl -tag -width Er
+.\" ipcperm could fail (we are opening to read and write, as it were)
+.It Bq Er EACCES
+Access permission failure.
+.\"
+.\" sysv_sem.c is quite explicit about these, so I'm pretty sure
+.\" this is accurate
+.\"
+.It Bq Er EEXIST
+IPC_CREAT and IPC_EXCL were specified, and a semaphore set
+corresponding to
+.Fa key
+already exists.
+.It Bq Er EINVAL
+The number of semaphores requested exceeds the system imposed maximum
+per set.
+.It Bq Er ENOSPC
+Insufficiently many semaphores are available.
+.It Bq Er ENOSPC
+The kernel could not allocate a
+.Fa "struct semid_ds" .
+.It Bq Er ENOENT
+No semaphore set was found corresponding to
+.Fa key ,
+and IPC_CREAT was not specified.
+.El
+.Sh SEE ALSO
+.Xr semctl 2 ,
+.Xr semop 2 ,
+.Xr ftok 3
diff --git a/lib/libc/sys/semop.2 b/lib/libc/sys/semop.2
new file mode 100644
index 0000000..a08f65e
--- /dev/null
+++ b/lib/libc/sys/semop.2
@@ -0,0 +1,289 @@
+.\"
+.\" Copyright (c) 1995 David Hovemeyer <daveho@infocom.com>
+.\"
+.\" All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY EXPRESS OR
+.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+.\" IN NO EVENT SHALL THE DEVELOPERS BE LIABLE FOR ANY DIRECT, INDIRECT,
+.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd September 22, 1995
+.Dt SEMOP 2
+.Os
+.Sh NAME
+.Nm semop
+.Nd atomic array of operations on a semaphore set
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In sys/types.h
+.In sys/ipc.h
+.In sys/sem.h
+.Ft int
+.Fn semop "int semid" "struct sembuf *array" "size_t nops"
+.Sh DESCRIPTION
+The
+.Fn semop
+system call
+atomically performs the array of operations indicated by
+.Fa array
+on the semaphore set indicated by
+.Fa semid .
+The length of
+.Fa array
+is indicated by
+.Fa nops .
+Each operation is encoded in a
+.Vt "struct sembuf" ,
+which is defined as follows:
+.\"
+.\" From <sys/sem.h>
+.\"
+.Bd -literal
+struct sembuf {
+        u_short sem_num;        /* semaphore # */
+        short   sem_op;         /* semaphore operation */
+        short   sem_flg;        /* operation flags */
+};
+.Ed
+.Pp
+For each element in
+.Fa array ,
+.Va sem_op
+and
+.Va sem_flg
+determine an operation to be performed on semaphore number
+.Va sem_num
+in the set.
+The values
+.Dv SEM_UNDO
+and
+.Dv IPC_NOWAIT
+may be
+.Em OR Ns 'ed
+into the
+.Va sem_flg
+member in order to modify the behavior of the given operation.
+.Pp
+The operation performed depends as follows on the value of
+.Va sem_op :
+.\"
+.\" This section is based on the description of semop() in
+.\" Stevens, _Advanced Programming in the UNIX Environment_,
+.\" and the semop(2) description in The Open Group Unix2 specification.
+.\"
+.Bl -bullet
+.It
+When
+.Va sem_op
+is positive and the process has alter permission,
+the semaphore's value is incremented by
+.Va sem_op Ns 's
+value.
+If
+.Dv SEM_UNDO
+is specified, the semaphore's adjust on exit value is decremented by
+.Va sem_op Ns 's
+value.
+A positive value for
+.Va sem_op
+generally corresponds to a process releasing a resource
+associated with the semaphore.
+.It
+The behavior when
+.Va sem_op
+is negative and the process has alter permission,
+depends on the current value of the semaphore:
+.Bl -bullet
+.It
+If the current value of the semaphore is greater than or equal to
+the absolute value of
+.Va sem_op ,
+then the value is decremented by the absolute value of
+.Va sem_op .
+If
+.Dv SEM_UNDO
+is specified, the semaphore's adjust on exit
+value is incremented by the absolute value of
+.Va sem_op .
+.It
+If the current value of the semaphore is less than the absolute value of
+.Va sem_op ,
+one of the following happens:
+.\" XXX a *second* sublist?
+.Bl -bullet
+.It
+If
+.Dv IPC_NOWAIT
+was specified, then
+.Fn semop
+returns immediately with a return value of
+.Er EAGAIN .
+.It
+Otherwise, the calling process is put to sleep until one of the following
+conditions is satisfied:
+.\" XXX We already have two sublists, why not a third?
+.Bl -bullet
+.It
+Some other process removes the semaphore with the
+.Dv IPC_RMID
+option of
+.Xr semctl 2 .
+In this case,
+.Fn semop
+returns immediately with a return value of
+.Er EIDRM .
+.It
+The process receives a signal that is to be caught.
+In this case, the process will resume execution as defined by
+.Xr sigaction 2 .
+.It
+The semaphore's
+value is greater than or equal to the absolute value of
+.Va sem_op .
+When this condition becomes true, the semaphore's value is decremented
+by the absolute value of
+.Va sem_op ,
+the semaphore's adjust on exit value is incremented by the
+absolute value of
+.Va sem_op .
+.El
+.El
+.El
+.Pp
+A negative value for
+.Va sem_op
+generally means that a process is waiting for a resource to become
+available.
+.It
+When
+.Va sem_op
+is zero and the process has read permission,
+one of the following will occur:
+.Bl -bullet
+.It
+If the current value of the semaphore is equal to zero
+then
+.Fn semop
+can return immediately.
+.It
+If
+.Dv IPC_NOWAIT
+was specified, then
+.Fn semop
+returns immediately with a return value of
+.Er EAGAIN .
+.It
+Otherwise, the calling process is put to sleep until one of the following
+conditions is satisfied:
+.\" XXX Another nested sublists
+.Bl -bullet
+.It
+Some other process removes the semaphore with the
+.Dv IPC_RMID
+option of
+.Xr semctl 2 .
+In this case,
+.Fn semop
+returns immediately with a return value of
+.Er EIDRM .
+.It
+The process receives a signal that is to be caught.
+In this case, the process will resume execution as defined by
+.Xr sigaction 2 .
+.It
+The semaphore's value becomes zero.
+.El
+.El
+.El
+.Pp
+For each semaphore a process has in use, the kernel maintains an
+.Dq "adjust on exit"
+value, as alluded to earlier.
+When a process
+exits, either voluntarily or involuntarily, the adjust on exit value
+for each semaphore is added to the semaphore's value.
+This can
+be used to ensure that a resource is released if a process terminates
+unexpectedly.
+.Sh RETURN VALUES
+.Rv -std semop
+.Sh ERRORS
+The
+.Fn semop
+system call will fail if:
+.Bl -tag -width Er
+.It Bq Er EINVAL
+No semaphore set corresponds to
+.Fa semid ,
+or the process would exceed the system-defined limit for the number of
+per-process
+.Dv SEM_UNDO
+structures.
+.It Bq Er EACCES
+Permission denied due to mismatch between operation and mode of
+semaphore set.
+.It Bq Er EAGAIN
+The semaphore's value would have resulted in the process being put to sleep
+and
+.Dv IPC_NOWAIT
+was specified.
+.It Bq Er E2BIG
+Too many operations were specified.
+.Bq Dv SEMOPM
+.It Bq Er EFBIG
+.\"
+.\" I'd have thought this would be EINVAL, but the source says
+.\" EFBIG.
+.\"
+.Va sem_num
+was not in the range of valid semaphores for the set.
+.It Bq Er EIDRM
+The semaphore set was removed from the system.
+.It Bq Er EINTR
+The
+.Fn semop
+system call was interrupted by a signal.
+.It Bq Er ENOSPC
+The system
+.Dv SEM_UNDO
+pool
+.Bq Dv SEMMNU
+is full.
+.It Bq Er ERANGE
+The requested operation would cause either
+the semaphore's current value
+.Bq Dv SEMVMX
+or its adjust on exit value
+.Bq Dv SEMAEM
+to exceed the system-imposed limits.
+.El
+.Sh SEE ALSO
+.Xr semctl 2 ,
+.Xr semget 2 ,
+.Xr sigaction 2
+.Sh BUGS
+The
+.Fn semop
+system call
+may block waiting for memory even if
+.Dv IPC_NOWAIT
+was specified.
diff --git a/lib/libc/sys/send.2 b/lib/libc/sys/send.2
new file mode 100644
index 0000000..8fa2c64
--- /dev/null
+++ b/lib/libc/sys/send.2
@@ -0,0 +1,232 @@
+.\" Copyright (c) 1983, 1991, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"     From: @(#)send.2	8.2 (Berkeley) 2/21/94
+.\" $FreeBSD$
+.\"
+.Dd February 5, 2009
+.Dt SEND 2
+.Os
+.Sh NAME
+.Nm send ,
+.Nm sendto ,
+.Nm sendmsg
+.Nd send a message from a socket
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In sys/types.h
+.In sys/socket.h
+.Ft ssize_t
+.Fn send "int s" "const void *msg" "size_t len" "int flags"
+.Ft ssize_t
+.Fn sendto "int s" "const void *msg" "size_t len" "int flags" "const struct sockaddr *to" "socklen_t tolen"
+.Ft ssize_t
+.Fn sendmsg "int s" "const struct msghdr *msg" "int flags"
+.Sh DESCRIPTION
+The
+.Fn send
+function,
+and
+.Fn sendto
+and
+.Fn sendmsg
+system calls
+are used to transmit a message to another socket.
+The
+.Fn send
+function
+may be used only when the socket is in a
+.Em connected
+state, while
+.Fn sendto
+and
+.Fn sendmsg
+may be used at any time.
+.Pp
+The address of the target is given by
+.Fa to
+with
+.Fa tolen
+specifying its size.
+The length of the message is given by
+.Fa len .
+If the message is too long to pass atomically through the
+underlying protocol, the error
+.Er EMSGSIZE
+is returned, and
+the message is not transmitted.
+.Pp
+No indication of failure to deliver is implicit in a
+.Fn send .
+Locally detected errors are indicated by a return value of -1.
+.Pp
+If no messages space is available at the socket to hold
+the message to be transmitted, then
+.Fn send
+normally blocks, unless the socket has been placed in
+non-blocking I/O mode.
+The
+.Xr select 2
+system call may be used to determine when it is possible to
+send more data.
+.Pp
+The
+.Fa flags
+argument may include one or more of the following:
+.Bd -literal
+#define	MSG_OOB		0x00001 /* process out-of-band data */
+#define	MSG_DONTROUTE	0x00004 /* bypass routing, use direct interface */
+#define MSG_EOR		0x00008 /* data completes record */
+#define	MSG_EOF		0x00100 /* data completes transaction */
+#define	MSG_NOSIGNAL	0x20000 /* do not generate SIGPIPE on EOF */
+.Ed
+.Pp
+The flag
+.Dv MSG_OOB
+is used to send
+.Dq out-of-band
+data on sockets that support this notion (e.g.\&
+.Dv SOCK_STREAM ) ;
+the underlying protocol must also support
+.Dq out-of-band
+data.
+.Dv MSG_EOR
+is used to indicate a record mark for protocols which support the
+concept.
+.Dv MSG_EOF
+requests that the sender side of a socket be shut down, and that an
+appropriate indication be sent at the end of the specified data;
+this flag is only implemented for
+.Dv SOCK_STREAM
+sockets in the
+.Dv PF_INET
+protocol family.
+.Dv MSG_DONTROUTE
+is usually used only by diagnostic or routing programs.
+.Dv MSG_NOSIGNAL
+is used to prevent
+.Dv SIGPIPE
+generation when writing a socket that
+may be closed.
+.Pp
+See
+.Xr recv 2
+for a description of the
+.Fa msghdr
+structure.
+.Sh RETURN VALUES
+The call returns the number of characters sent, or -1
+if an error occurred.
+.Sh ERRORS
+The
+.Fn send
+function and
+.Fn sendto
+and
+.Fn sendmsg
+system calls
+fail if:
+.Bl -tag -width Er
+.It Bq Er EBADF
+An invalid descriptor was specified.
+.It Bq Er EACCES
+The destination address is a broadcast address, and
+.Dv SO_BROADCAST
+has not been set on the socket.
+.It Bq Er ENOTSOCK
+The argument
+.Fa s
+is not a socket.
+.It Bq Er EFAULT
+An invalid user space address was specified for an argument.
+.It Bq Er EMSGSIZE
+The socket requires that message be sent atomically,
+and the size of the message to be sent made this impossible.
+.It Bq Er EAGAIN
+The socket is marked non-blocking and the requested operation
+would block.
+.It Bq Er ENOBUFS
+The system was unable to allocate an internal buffer.
+The operation may succeed when buffers become available.
+.It Bq Er ENOBUFS
+The output queue for a network interface was full.
+This generally indicates that the interface has stopped sending,
+but may be caused by transient congestion.
+.It Bq Er EHOSTUNREACH
+The remote host was unreachable.
+.It Bq Er EISCONN
+A destination address was specified and the socket is already connected.
+.It Bq Er ECONNREFUSED
+The socket received an ICMP destination unreachable message
+from the last message sent.
+This typically means that the
+receiver is not listening on the remote port.
+.It Bq Er EHOSTDOWN
+The remote host was down.
+.It Bq Er ENETDOWN
+The remote network was down.
+.It Bq Er EADDRNOTAVAIL
+The process using a
+.Dv SOCK_RAW
+socket was jailed and the source
+address specified in the IP header did not match the IP
+address bound to the prison.
+.It Bq Er EPIPE
+The socket is unable to send anymore data
+.Dv ( SBS_CANTSENDMORE
+has been set on the socket).
+This typically means that the socket
+is not connected.
+.El
+.Sh SEE ALSO
+.Xr fcntl 2 ,
+.Xr getsockopt 2 ,
+.Xr recv 2 ,
+.Xr select 2 ,
+.Xr socket 2 ,
+.Xr write 2
+.Sh HISTORY
+The
+.Fn send
+function appeared in
+.Bx 4.2 .
+.Sh BUGS
+Because
+.Fn sendmsg
+does not necessarily block until the data has been transferred, it
+is possible to transfer an open file descriptor across an
+.Dv AF_UNIX
+domain socket
+(see
+.Xr recv 2 ) ,
+then
+.Fn close
+it before it has actually been sent, the result being that the receiver
+gets a closed file descriptor.
+It is left to the application to
+implement an acknowledgment mechanism to prevent this from happening.
diff --git a/lib/libc/sys/sendfile.2 b/lib/libc/sys/sendfile.2
new file mode 100644
index 0000000..d9f8cab
--- /dev/null
+++ b/lib/libc/sys/sendfile.2
@@ -0,0 +1,316 @@
+.\" Copyright (c) 2003, David G. Lawrence
+.\" All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice unmodified, this list of conditions, and the following
+.\"    disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd January 7, 2010
+.Dt SENDFILE 2
+.Os
+.Sh NAME
+.Nm sendfile
+.Nd send a file to a socket
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In sys/types.h
+.In sys/socket.h
+.In sys/uio.h
+.Ft int
+.Fo sendfile
+.Fa "int fd" "int s" "off_t offset" "size_t nbytes"
+.Fa "struct sf_hdtr *hdtr" "off_t *sbytes" "int flags"
+.Fc
+.Sh DESCRIPTION
+The
+.Fn sendfile
+system call
+sends a regular file specified by descriptor
+.Fa fd
+out a stream socket specified by descriptor
+.Fa s .
+.Pp
+The
+.Fa offset
+argument specifies where to begin in the file.
+Should
+.Fa offset
+fall beyond the end of file, the system will return
+success and report 0 bytes sent as described below.
+The
+.Fa nbytes
+argument specifies how many bytes of the file should be sent, with 0 having the special
+meaning of send until the end of file has been reached.
+.Pp
+An optional header and/or trailer can be sent before and after the file data by specifying
+a pointer to a
+.Vt "struct sf_hdtr" ,
+which has the following structure:
+.Pp
+.Bd -literal -offset indent -compact
+struct sf_hdtr {
+	struct iovec *headers;	/* pointer to header iovecs */
+	int hdr_cnt;		/* number of header iovecs */
+	struct iovec *trailers;	/* pointer to trailer iovecs */
+	int trl_cnt;		/* number of trailer iovecs */
+};
+.Ed
+.Pp
+The
+.Fa headers
+and
+.Fa trailers
+pointers, if
+.Pf non- Dv NULL ,
+point to arrays of
+.Vt "struct iovec"
+structures.
+See the
+.Fn writev
+system call for information on the iovec structure.
+The number of iovecs in these
+arrays is specified by
+.Fa hdr_cnt
+and
+.Fa trl_cnt .
+.Pp
+If
+.Pf non- Dv NULL ,
+the system will write the total number of bytes sent on the socket to the
+variable pointed to by
+.Fa sbytes .
+.Pp
+The
+.Fa flags
+argument is a bitmap of these values:
+.Bl -item -offset indent 
+.It
+.Dv SF_NODISKIO .
+This flag causes any
+.Fn sendfile
+call which would block on disk I/O to instead
+return
+.Er EBUSY .
+Busy servers may benefit by transferring requests that would
+block to a separate I/O worker thread.
+.It
+.Dv SF_MNOWAIT .
+Do not wait for some kernel resource to become available,
+in particular,
+.Vt mbuf
+and
+.Vt sf_buf .
+The flag does not make the
+.Fn sendfile
+syscall truly non-blocking, since other resources are still allocated
+in a blocking fashion.
+.It
+.Dv SF_SYNC .
+.Nm
+sleeps until the network stack no longer references the VM pages
+of the file, making subsequent modifications to it safe.
+Please note that this is not a guarantee that the data has actually
+been sent.
+.El
+.Pp
+When using a socket marked for non-blocking I/O,
+.Fn sendfile
+may send fewer bytes than requested.
+In this case, the number of bytes successfully
+written is returned in
+.Fa *sbytes
+(if specified),
+and the error
+.Er EAGAIN
+is returned.
+.Sh IMPLEMENTATION NOTES
+The
+.Fx
+implementation of
+.Fn sendfile
+is "zero-copy", meaning that it has been optimized so that copying of the file data is avoided.
+.Sh TUNING
+On some architectures, this system call internally uses a special
+.Fn sendfile
+buffer
+.Pq Vt "struct sf_buf"
+to handle sending file data to the client.
+If the sending socket is
+blocking, and there are not enough
+.Fn sendfile
+buffers available,
+.Fn sendfile
+will block and report a state of
+.Dq Li sfbufa .
+If the sending socket is non-blocking and there are not enough
+.Fn sendfile
+buffers available, the call will block and wait for the
+necessary buffers to become available before finishing the call.
+.Pp
+The number of
+.Vt sf_buf Ns 's
+allocated should be proportional to the number of nmbclusters used to
+send data to a client via
+.Fn sendfile .
+Tune accordingly to avoid blocking!
+Busy installations that make extensive use of
+.Fn sendfile
+may want to increase these values to be inline with their
+.Va kern.ipc.nmbclusters
+(see
+.Xr tuning 7
+for details).
+.Pp
+The number of
+.Fn sendfile
+buffers available is determined at boot time by either the
+.Va kern.ipc.nsfbufs
+.Xr loader.conf 5
+variable or the
+.Dv NSFBUFS
+kernel configuration tunable.
+The number of
+.Fn sendfile
+buffers scales with
+.Va kern.maxusers .
+The
+.Va kern.ipc.nsfbufsused
+and
+.Va kern.ipc.nsfbufspeak
+read-only
+.Xr sysctl 8
+variables show current and peak
+.Fn sendfile
+buffers usage respectively.
+These values may also be viewed through
+.Nm netstat Fl m .
+.Pp
+If a value of zero is reported for
+.Va kern.ipc.nsfbufs ,
+your architecture does not need to use
+.Fn sendfile
+buffers because their task can be efficiently performed
+by the generic virtual memory structures.
+.Sh RETURN VALUES
+.Rv -std sendfile
+.Sh ERRORS
+.Bl -tag -width Er
+.It Bq Er EAGAIN
+The socket is marked for non-blocking I/O and not all data was sent due to
+the socket buffer being filled.
+If specified, the number of bytes successfully sent will be returned in
+.Fa *sbytes .
+.It Bq Er EBADF
+The
+.Fa fd
+argument
+is not a valid file descriptor.
+.It Bq Er EBADF
+The
+.Fa s
+argument
+is not a valid socket descriptor.
+.It Bq Er EBUSY
+Completing the entire transfer would have required disk I/O, so
+it was aborted.
+Partial data may have been sent.
+(This error can only occur when
+.Dv SF_NODISKIO
+is specified.)
+.It Bq Er EFAULT
+An invalid address was specified for an argument.
+.It Bq Er EINTR
+A signal interrupted
+.Fn sendfile
+before it could be completed.
+If specified, the number
+of bytes successfully sent will be returned in
+.Fa *sbytes .
+.It Bq Er EINVAL
+The
+.Fa fd
+argument
+is not a regular file.
+.It Bq Er EINVAL
+The
+.Fa s
+argument
+is not a SOCK_STREAM type socket.
+.It Bq Er EINVAL
+The
+.Fa offset
+argument
+is negative.
+.It Bq Er EIO
+An error occurred while reading from
+.Fa fd .
+.It Bq Er ENOTCONN
+The
+.Fa s
+argument
+points to an unconnected socket.
+.It Bq Er ENOTSOCK
+The
+.Fa s
+argument
+is not a socket.
+.It Bq Er EOPNOTSUPP
+The file system for descriptor
+.Fa fd
+does not support
+.Fn sendfile .
+.It Bq Er EPIPE
+The socket peer has closed the connection.
+.El
+.Sh SEE ALSO
+.Xr netstat 1 ,
+.Xr open 2 ,
+.Xr send 2 ,
+.Xr socket 2 ,
+.Xr writev 2 ,
+.Xr tuning 7
+.Rs
+.%A K. Elmeleegy
+.%A A. Chanda
+.%A A. L. Cox
+.%A W. Zwaenepoel
+.%T A Portable Kernel Abstraction for Low-Overhead Ephemeral Mapping Management
+.%J The Proceedings of the 2005 USENIX Annual Technical Conference
+.%P pp 223-236
+.%D 2005
+.Re
+.Sh HISTORY
+The
+.Fn sendfile
+system call
+first appeared in
+.Fx 3.0 .
+This manual page first appeared in
+.Fx 3.1 .
+.Sh AUTHORS
+The
+.Fn sendfile
+system call
+and this manual page were written by
+.An David G. Lawrence Aq dg@dglawrence.com .
diff --git a/lib/libc/sys/setfib.2 b/lib/libc/sys/setfib.2
new file mode 100644
index 0000000..a65a064
--- /dev/null
+++ b/lib/libc/sys/setfib.2
@@ -0,0 +1,84 @@
+.\" Copyright (c) 2008 Cisco Systems.  All rights reserved.
+.\"    Author: Julian Elischer
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Neither the name of the Cisco Systems nor the names of its employees
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd August 8, 2008
+.Dt SETFIB 2
+.Os
+.Sh NAME
+.Nm setfib
+.Nd set the default FIB (routing table) for the calling process.
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In sys/socket.h
+.Ft int
+.Fn setfib "int fib"
+.Sh DESCRIPTION
+The
+.Fn setfib
+system call sets the associated fib for all sockets opened
+subsequent to the call, to be that of the argument
+.Fa fib .
+The
+.Fa fib
+argument
+may be between 0 and the current system maximum which 
+may be retrieved by the 
+.Va net.fibs
+sysctl.
+The default fib of the process will be applied to all protocol families 
+that support multiple fibs, and ignored by those that do not.
+The default fib for a process may be overridden for a socket with the use
+of the
+.Dv SO_SETFIB
+socket option.
+.Sh RETURN VALUES
+.Rv -std setfib
+.Sh ERRORS
+The
+.Fn setfib
+system call
+will fail and no action will be taken and return
+.Er EINVAL
+if the
+.Fa fib
+argument is greater than the current system maximum.
+.Sh SEE ALSO
+.Xr setfib 1 ,
+.Xr setsockopt 2
+.Sh STANDARDS
+The
+.Fn setfib
+system call is a
+.Fx
+extension however similar extensions
+have been added to many other
+.Ux style kernels.
+.Sh HISTORY
+The
+.Fn setfib
+function appeared in
+.Fx 7.1 .
diff --git a/lib/libc/sys/setgroups.2 b/lib/libc/sys/setgroups.2
new file mode 100644
index 0000000..ef4c34c
--- /dev/null
+++ b/lib/libc/sys/setgroups.2
@@ -0,0 +1,87 @@
+.\" Copyright (c) 1983, 1991, 1993, 1994
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"     @(#)setgroups.2	8.2 (Berkeley) 4/16/94
+.\" $FreeBSD$
+.\"
+.Dd April 16, 1994
+.Dt SETGROUPS 2
+.Os
+.Sh NAME
+.Nm setgroups
+.Nd set group access list
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In sys/param.h
+.In unistd.h
+.Ft int
+.Fn setgroups "int ngroups" "const gid_t *gidset"
+.Sh DESCRIPTION
+The
+.Fn setgroups
+system call
+sets the group access list of the current user process
+according to the array
+.Fa gidset .
+The
+.Fa ngroups
+argument
+indicates the number of entries in the array and must be no
+more than
+.Dv {NGROUPS_MAX}+1 .
+.Pp
+Only the super-user may set a new group list.
+.Sh RETURN VALUES
+.Rv -std setgroups
+.Sh ERRORS
+The
+.Fn setgroups
+system call will fail if:
+.Bl -tag -width Er
+.It Bq Er EPERM
+The caller is not the super-user.
+.It Bq Er EINVAL
+The number specified in the
+.Fa ngroups
+argument is larger than the
+.Dv {NGROUPS_MAX}+1
+limit.
+.It Bq Er EFAULT
+The address specified for
+.Fa gidset
+is outside the process
+address space.
+.El
+.Sh SEE ALSO
+.Xr getgroups 2 ,
+.Xr initgroups 3
+.Sh HISTORY
+The
+.Fn setgroups
+system call appeared in
+.Bx 4.2 .
diff --git a/lib/libc/sys/setpgid.2 b/lib/libc/sys/setpgid.2
new file mode 100644
index 0000000..4ad89de
--- /dev/null
+++ b/lib/libc/sys/setpgid.2
@@ -0,0 +1,110 @@
+.\" Copyright (c) 1980, 1991, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"     @(#)setpgid.2	8.1 (Berkeley) 6/4/93
+.\" $FreeBSD$
+.\"
+.Dd February 8, 2004
+.Dt SETPGID 2
+.Os
+.Sh NAME
+.Nm setpgid ,
+.Nm setpgrp
+.Nd set process group
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In unistd.h
+.Ft int
+.Fn setpgid "pid_t pid" "pid_t pgrp"
+.Ft int
+.Fn setpgrp "pid_t pid" "pid_t pgrp"
+.Sh DESCRIPTION
+The
+.Fn setpgid
+system call
+sets the process group of the specified process
+.Fa pid
+to the specified
+.Fa pgrp .
+If
+.Fa pid
+is zero, then the call applies to the current process.
+If
+.Fa pgrp
+is zero, then the process id of the process specified by
+.Fa pid
+is used instead.
+.Pp
+If the affected process is not the invoking process, then it must be a
+child of the invoking process, it must not have performed an
+.Xr exec 3
+operation, and both processes must be in the same session.
+The requested process group ID must already exist in the session of
+the caller, or it must be equal to the target process ID.
+.Sh RETURN VALUES
+.Rv -std setpgid
+.Sh COMPATIBILITY
+The
+.Fn setpgrp
+system call
+is identical to
+.Fn setpgid ,
+and is retained for calling convention compatibility with historical
+versions of
+.Bx .
+.Sh ERRORS
+The
+.Fn setpgid
+system call
+will fail and the process group will not be altered if:
+.Bl -tag -width Er
+.It Bq Er EINVAL
+The requested process group ID is not legal.
+.It Bq Er ESRCH
+The requested process does not exist.
+.It Bq Er ESRCH
+The target process is not the calling process or
+a child of the calling process.
+.It Bq Er EACCES
+The requested process is a child of the calling process,
+but it has performed an
+.Xr exec 3
+operation.
+.It Bq Er EPERM
+The target process is a session leader.
+.It Bq Er EPERM
+The requested process group ID is not in the session of the caller,
+and it is not equal to the process ID of the target process.
+.El
+.Sh SEE ALSO
+.Xr getpgrp 2
+.Sh STANDARDS
+The
+.Fn setpgid
+system call is expected to conform to
+.St -p1003.1-90 .
diff --git a/lib/libc/sys/setregid.2 b/lib/libc/sys/setregid.2
new file mode 100644
index 0000000..2eedae2
--- /dev/null
+++ b/lib/libc/sys/setregid.2
@@ -0,0 +1,90 @@
+.\" Copyright (c) 1980, 1991, 1993, 1994
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"     @(#)setregid.2	8.2 (Berkeley) 4/16/94
+.\" $FreeBSD$
+.\"
+.Dd April 16, 1994
+.Dt SETREGID 2
+.Os
+.Sh NAME
+.Nm setregid
+.Nd set real and effective group ID
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In unistd.h
+.Ft int
+.Fn setregid "gid_t rgid" "gid_t egid"
+.Sh DESCRIPTION
+The real and effective group ID's of the current process
+are set to the arguments.
+If the real group ID is changed, the saved group ID is changed to the
+new value of the effective group ID.
+.Pp
+Unprivileged users may change the real group
+ID to the effective group ID and vice-versa; only the super-user may
+make other changes.
+.Pp
+Supplying a value of -1 for either the real or effective
+group ID forces the system to substitute the current
+ID in place of the -1 argument.
+.Pp
+The
+.Fn setregid
+system call was intended to allow swapping
+the real and effective group IDs
+in set-group-ID programs to temporarily relinquish the set-group-ID value.
+This system call did not work correctly,
+and its purpose is now better served by the use of the
+.Xr setegid 2
+system call.
+.Pp
+When setting the real and effective group IDs to the same value,
+the standard
+.Fn setgid
+system call is preferred.
+.Sh RETURN VALUES
+.Rv -std setregid
+.Sh ERRORS
+.Bl -tag -width Er
+.It Bq Er EPERM
+The current process is not the super-user and a change
+other than changing the effective group-id to the real group-id
+was specified.
+.El
+.Sh SEE ALSO
+.Xr getgid 2 ,
+.Xr issetugid 2 ,
+.Xr setegid 2 ,
+.Xr setgid 2 ,
+.Xr setuid 2
+.Sh HISTORY
+The
+.Fn setregid
+system call appeared in
+.Bx 4.2 .
diff --git a/lib/libc/sys/setresuid.2 b/lib/libc/sys/setresuid.2
new file mode 100644
index 0000000..08d07f3
--- /dev/null
+++ b/lib/libc/sys/setresuid.2
@@ -0,0 +1,99 @@
+.\" Copyright (c) 2000
+.\"      Sheldon Hearn.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES
+.\"
+.\" $FreeBSD$
+.\"
+.Dd April 13, 2001
+.Dt SETRESUID 2
+.Os
+.Sh NAME
+.Nm getresgid ,
+.Nm getresuid ,
+.Nm setresgid ,
+.Nm setresuid
+.Nd "get or set real, effective and saved user or group ID"
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In sys/types.h
+.In unistd.h
+.Ft int
+.Fn getresgid "gid_t *rgid" "gid_t *egid" "gid_t *sgid"
+.Ft int
+.Fn getresuid "uid_t *ruid" "uid_t *euid" "uid_t *suid"
+.Ft int
+.Fn setresgid "gid_t rgid" "gid_t egid" "gid_t sgid"
+.Ft int
+.Fn setresuid "uid_t ruid" "uid_t euid" "uid_t suid"
+.Sh DESCRIPTION
+The
+.Fn setresuid
+system call sets the real,
+effective and saved user IDs of the current process.
+The analogous
+.Fn setresgid
+sets the real, effective and saved group IDs.
+.Pp
+Privileged processes may set these IDs
+to arbitrary values.
+Unprivileged processes are restricted
+in that each of the new IDs must match one of the current IDs.
+.Pp
+Passing -1 as an argument causes the corresponding value
+to remain unchanged.
+.Pp
+The
+.Fn getresgid
+and
+.Fn getresuid
+calls retrieve the real, effective, and saved group and user IDs of
+the current process, respectively.
+.Sh RETURN VALUES
+.Rv -std
+.Sh ERRORS
+.Bl -tag -width Er
+.It Bq Er EPERM
+The calling process was not privileged
+and tried to change one or more IDs to a value
+which was not the current real ID, the current effective ID
+nor the current saved ID.
+.It Bq Er EFAULT
+An address passed to
+.Fn getresgid
+or
+.Fn getresuid
+was invalid.
+.El
+.Sh SEE ALSO
+.Xr getegid 2 ,
+.Xr geteuid 2 ,
+.Xr getgid 2 ,
+.Xr getuid 2 ,
+.Xr issetugid 2 ,
+.Xr setgid 2 ,
+.Xr setregid 2 ,
+.Xr setreuid 2 ,
+.Xr setuid 2
+.Sh STANDARDS
+These system calls are not available on many platforms.
+They exist in
+.Fx
+to support Linux binaries linked against GNU libc2.
+.Sh HISTORY
+These functions first appeared in HP-UX.
diff --git a/lib/libc/sys/setreuid.2 b/lib/libc/sys/setreuid.2
new file mode 100644
index 0000000..2983820
--- /dev/null
+++ b/lib/libc/sys/setreuid.2
@@ -0,0 +1,90 @@
+.\" Copyright (c) 1980, 1991, 1993, 1994
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"     @(#)setreuid.2	8.2 (Berkeley) 4/16/94
+.\" $FreeBSD$
+.\"
+.Dd February 8, 2001
+.Dt SETREUID 2
+.Os
+.Sh NAME
+.Nm setreuid
+.Nd set real and effective user ID's
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In unistd.h
+.Ft int
+.Fn setreuid "uid_t ruid" "uid_t euid"
+.Sh DESCRIPTION
+The real and effective user IDs of the
+current process are set according to the arguments.
+If
+.Fa ruid
+or
+.Fa euid
+is -1, the current uid is filled in by the system.
+Unprivileged users may change the real user
+ID to the effective user ID and vice-versa; only the super-user may
+make other changes.
+.Pp
+If the real user ID is changed (i.e.\&
+.Fa ruid
+is not -1) or the effective user ID is changed to something other than
+the real user ID, then the saved user ID will be set to the effective user ID.
+.Pp
+The
+.Fn setreuid
+system call has been used to swap the real and effective user IDs
+in set-user-ID programs to temporarily relinquish the set-user-ID value.
+This purpose is now better served by the use of the
+.Xr seteuid 2
+system call.
+.Pp
+When setting the real and effective user IDs to the same value,
+the standard
+.Fn setuid
+system call is preferred.
+.Sh RETURN VALUES
+.Rv -std setreuid
+.Sh ERRORS
+.Bl -tag -width Er
+.It Bq Er EPERM
+The current process is not the super-user and a change
+other than changing the effective user-id to the real user-id
+was specified.
+.El
+.Sh SEE ALSO
+.Xr getuid 2 ,
+.Xr issetugid 2 ,
+.Xr seteuid 2 ,
+.Xr setuid 2
+.Sh HISTORY
+The
+.Fn setreuid
+system call appeared in
+.Bx 4.2 .
diff --git a/lib/libc/sys/setsid.2 b/lib/libc/sys/setsid.2
new file mode 100644
index 0000000..a09a31a
--- /dev/null
+++ b/lib/libc/sys/setsid.2
@@ -0,0 +1,81 @@
+.\" Copyright (c) 1991, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"	@(#)setsid.2	8.1 (Berkeley) 6/4/93
+.\" $FreeBSD$
+.\"
+.Dd June 4, 1993
+.Dt SETSID 2
+.Os
+.Sh NAME
+.Nm setsid
+.Nd create session and set process group ID
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In unistd.h
+.Ft pid_t
+.Fn setsid void
+.Sh DESCRIPTION
+The
+.Fn setsid
+system call creates a new session.
+The calling process is the session leader of the new session, is the
+process group leader of a new process group and has no controlling
+terminal.
+The calling process is the only process in either the session or the
+process group.
+.Sh RETURN VALUES
+Upon successful completion, the
+.Fn setsid
+system call returns the value of the process group ID of the new process
+group, which is the same as the process ID of the calling process.
+If an error occurs,
+.Fn setsid
+returns -1 and the global variable
+.Va errno
+is set to indicate the error.
+.Sh ERRORS
+The
+.Fn setsid
+system call will fail if:
+.Bl -tag -width Er
+.It Bq Er EPERM
+The calling process is already a process group leader, or the process
+group ID of a process other than the calling process matches the process
+ID of the calling process.
+.El
+.Sh SEE ALSO
+.Xr setpgid 2 ,
+.Xr tcgetpgrp 3 ,
+.Xr tcsetpgrp 3
+.Sh STANDARDS
+The
+.Fn setsid
+system call is expected to be compliant with the
+.St -p1003.1-90
+specification.
diff --git a/lib/libc/sys/setuid.2 b/lib/libc/sys/setuid.2
new file mode 100644
index 0000000..4bb4a68
--- /dev/null
+++ b/lib/libc/sys/setuid.2
@@ -0,0 +1,193 @@
+.\" Copyright (c) 1983, 1991, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"     @(#)setuid.2	8.1 (Berkeley) 6/4/93
+.\" $FreeBSD$
+.\"
+.Dd June 4, 1993
+.Dt SETUID 2
+.Os
+.Sh NAME
+.Nm setuid ,
+.Nm seteuid ,
+.Nm setgid ,
+.Nm setegid
+.Nd set user and group ID
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In sys/types.h
+.In unistd.h
+.Ft int
+.Fn setuid "uid_t uid"
+.Ft int
+.Fn seteuid "uid_t euid"
+.Ft int
+.Fn setgid "gid_t gid"
+.Ft int
+.Fn setegid "gid_t egid"
+.Sh DESCRIPTION
+The
+.Fn setuid
+system call
+sets the real and effective
+user IDs and the saved set-user-ID of the current process
+to the specified value.
+.\" Comment out next block for !_POSIX_SAVED_IDS
+.\" The real user ID and the saved set-user-ID are changed only if the
+.\" effective user ID is that of the super user.
+.\" I.e.
+.\" .Fn setuid
+.\" system call is equal to
+.\" .Fn seteuid
+.\" system call if the effective user ID is not that of the super user.
+.\" End of block
+The
+.Fn setuid
+system call is permitted if the specified ID is equal to the real user ID
+.\" Comment out next line for !_POSIX_SAVED_IDS
+.\" or the saved set-user-ID
+.\" Next line is for Appendix B.4.2.2 case.
+or the effective user ID
+of the process, or if the effective user ID is that of the super user.
+.Pp
+The
+.Fn setgid
+system call
+sets the real and effective
+group IDs and the saved set-group-ID of the current process
+to the specified value.
+.\" Comment out next block for !_POSIX_SAVED_IDS
+.\" The real group ID and the saved set-group-ID are changed only if the
+.\" effective user ID is that of the super user.
+.\" I.e.
+.\" .Fn setgid
+.\" system call is equal to
+.\" .Fn setegid
+.\" system call if the effective user ID is not that of the super user.
+.\" End of block
+The
+.Fn setgid
+system call is permitted if the specified ID is equal to the real group ID
+.\" Comment out next line for !_POSIX_SAVED_IDS
+.\" or the saved set-group-ID
+.\" Next line is for Appendix B.4.2.2 case.
+or the effective group ID
+of the process, or if the effective user ID is that of the super user.
+.Pp
+The
+.Fn seteuid
+system call
+.Pq Fn setegid
+sets the effective user ID (group ID) of the
+current process.
+The effective user ID may be set to the value
+of the real user ID or the saved set-user-ID (see
+.Xr intro 2
+and
+.Xr execve 2 ) ;
+in this way, the effective user ID of a set-user-ID executable
+may be toggled by switching to the real user ID, then re-enabled
+by reverting to the set-user-ID value.
+Similarly, the effective group ID may be set to the value
+of the real group ID or the saved set-group-ID.
+.Sh RETURN VALUES
+.Rv -std
+.Sh ERRORS
+The system calls will fail if:
+.Bl -tag -width Er
+.It Bq Er EPERM
+The user is not the super user and the ID
+specified is not the real, effective ID, or saved ID.
+.El
+.Sh SEE ALSO
+.Xr getgid 2 ,
+.Xr getuid 2 ,
+.Xr issetugid 2 ,
+.Xr setregid 2 ,
+.Xr setreuid 2
+.Sh STANDARDS
+The
+.Fn setuid
+and
+.Fn setgid
+system calls are compliant with the
+.St -p1003.1-90
+specification with
+.Li _POSIX_SAVED_IDS
+.\" Uncomment next line for !_POSIX_SAVED_IDS
+not
+defined with the permitted extensions from Appendix B.4.2.2.
+The
+.Fn seteuid
+and
+.Fn setegid
+system calls are extensions based on the
+.Tn POSIX
+concept of
+.Li _POSIX_SAVED_IDS ,
+and have been proposed for a future revision of the standard.
+.Sh HISTORY
+The
+.Fn setuid
+and
+.Fn setgid
+functions appeared in
+.At v7 .
+.Sh SECURITY CONSIDERATIONS
+Read and write permissions to files are determined upon a call to
+.Xr open 2 .
+Once a file descriptor is open, dropping privilege does not affect
+the process's read/write permissions, even if the user ID specified
+has no read or write permissions to the file.
+These files normally remain open in any new process executed,
+resulting in a user being able to read or modify
+potentially sensitive data.
+.Pp
+To prevent these files from remaining open after an
+.Xr exec 3
+call, be sure to set the close-on-exec flag is set:
+.Bd -literal
+void
+pseudocode(void)
+{
+	int fd;
+	/* ... */
+
+	fd = open("/path/to/sensitive/data", O_RDWR);
+	if (fd == -1)
+		err(1, "open");
+
+	/*
+	 * Set close-on-exec flag; see fcntl(2) for more information.
+	 */
+	if (fcntl(fd, F_SETFD, FD_CLOEXEC) == -1)
+		err(1, "fcntl(F_SETFD)");
+	/* ... */
+	execve(path, argv, environ);
+}
+.Ed
diff --git a/lib/libc/sys/shm_open.2 b/lib/libc/sys/shm_open.2
new file mode 100644
index 0000000..a2fa502
--- /dev/null
+++ b/lib/libc/sys/shm_open.2
@@ -0,0 +1,283 @@
+.\"
+.\" Copyright 2000 Massachusetts Institute of Technology
+.\"
+.\" Permission to use, copy, modify, and distribute this software and
+.\" its documentation for any purpose and without fee is hereby
+.\" granted, provided that both the above copyright notice and this
+.\" permission notice appear in all copies, that both the above
+.\" copyright notice and this permission notice appear in all
+.\" supporting documentation, and that the name of M.I.T. not be used
+.\" in advertising or publicity pertaining to distribution of the
+.\" software without specific, written prior permission.  M.I.T. makes
+.\" no representations about the suitability of this software for any
+.\" purpose.  It is provided "as is" without express or implied
+.\" warranty.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''.  M.I.T. DISCLAIMS
+.\" ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE,
+.\" INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+.\" MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT
+.\" SHALL M.I.T. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+.\" SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+.\" LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
+.\" USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+.\" ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+.\" OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
+.\" OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd March 20, 2007
+.Dt SHM_OPEN 2
+.Os
+.Sh NAME
+.Nm shm_open , shm_unlink
+.Nd "shared memory object operations"
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In sys/types.h
+.In sys/mman.h
+.In fcntl.h
+.Ft int
+.Fn shm_open "const char *path" "int flags" "mode_t mode"
+.Ft int
+.Fn shm_unlink "const char *path"
+.Sh DESCRIPTION
+The
+.Fn shm_open
+system call opens (or optionally creates) a
+.Tn POSIX
+shared memory object named
+.Fa path .
+The
+.Fa flags
+argument contains a subset of the flags used by
+.Xr open 2 .
+An access mode of either
+.Dv O_RDONLY
+or
+.Dv O_RDWR
+must be included in
+.Fa flags .
+The optional flags
+.Dv O_CREAT ,
+.Dv O_EXCL ,
+and
+.Dv O_TRUNC
+may also be specified.
+.Pp
+If
+.Dv O_CREAT
+is specified,
+then a new shared memory object named
+.Fa path
+will be created if it does not exist.
+In this case,
+the shared memory object is created with mode
+.Fa mode
+subject to the process' umask value.
+If both the
+.Dv O_CREAT
+and
+.Dv O_EXCL
+flags are specified and a shared memory object named
+.Fa path
+already exists,
+then
+.Fn shm_open
+will fail with
+.Er EEXIST.
+.Pp
+Newly created objects start off with a size of zero.
+If an existing shared memory object is opened with
+.Dv O_RDWR
+and the
+.Dv O_TRUNC
+flag is specified,
+then the shared memory object will be truncated to a size of zero.
+The size of the object can be adjusted via
+.Xr ftruncate 2
+and queried via
+.Xr fstat 2 .
+.Pp
+The new descriptor is set to close during
+.Xr execve 2
+system calls;
+see
+.Xr close 2
+and
+.Xr fcntl 2 .
+.Pp
+As a FreeBSD extension,
+the constant
+.Dv SHM_ANON
+may be used for the
+.Fa path
+argument to
+.Fn shm_open .
+In this case, an anonymous, unnamed shared memory object is created.
+Since the object has no name,
+it cannot be removed via a subsequent call to
+.Fn shm_unlink .
+Instead,
+the shared memory object will be garbage collected when the last reference to
+the shared memory object is removed.
+The shared memory object may be shared with other processes by sharing the
+file descriptor via
+.Xr fork 2
+or
+.Xr sendmsg 2 .
+Attempting to open an anonymous shared memory object with
+.Dv O_RDONLY
+will fail with
+.Er EINVAL .
+All other flags are ignored.
+.Pp
+The
+.Fn shm_unlink
+system call removes a shared memory object named
+.Fa path .
+.Pp
+.Sh RETURN VALUES
+If successful,
+.Fn shm_open
+returns a non-negative integer,
+and
+.Fn shm_unlink
+returns zero.
+Both functions return -1 on failure, and set
+.Va errno
+to indicate the error.
+.Sh COMPATIBILITY
+The
+.Fa path
+argument does not necessarily represent a pathname (although it does in
+most other implementations).
+Two processes opening the same
+.Fa path
+are guaranteed to access the same shared memory object if and only if
+.Fa path
+begins with a slash
+.Pq Ql \&/
+character.
+.Pp
+Only the
+.Dv O_RDONLY ,
+.Dv O_RDWR ,
+.Dv O_CREAT ,
+.Dv O_EXCL ,
+and
+.Dv O_TRUNC
+flags may be used in portable programs.
+.Pp
+The result of using
+.Xr open 2 ,
+.Xr read 2 ,
+or
+.Xr write 2
+on a shared memory object, or on the descriptor returned by
+.Fn shm_open ,
+is undefined.
+It is also undefined whether the shared memory object itself, or its
+contents, persist across reboots.
+.Pp
+In FreeBSD,
+.Xr read 2
+and
+.Xr write 2
+on a shared memory object will fail with
+.Er EOPNOTSUPP
+and neither shared memory objects nor their contents persist across reboots.
+.Sh ERRORS
+The following errors are defined for
+.Fn shm_open :
+.Bl -tag -width Er
+.It Bq Er EINVAL
+A flag other than
+.Dv O_RDONLY ,
+.Dv O_RDWR ,
+.Dv O_CREAT ,
+.Dv O_EXCL ,
+or
+.Dv O_TRUNC
+was included in
+.Fa flags .
+.It Bq Er EMFILE
+The process has already reached its limit for open file descriptors.
+.It Bq Er ENFILE
+The system file table is full.
+.It Bq Er EINVAL
+.Dv O_RDONLY
+was specified while creating an anonymous shared memory object via
+.Dv SHM_ANON .
+.It Bq Er EFAULT
+The
+.Fa path
+argument points outside the process' allocated address space.
+.It Bq Er ENAMETOOLONG
+The entire pathname exceeded 1023 characters.
+.It Bq Er EINVAL
+The
+.Fa path
+does not begin with a slash
+.Pq Ql \&/
+character.
+.It Bq Er ENOENT
+.Dv O_CREAT
+is specified and the named shared memory object does not exist.
+.It Bq Er EEXIST
+.Dv O_CREAT
+and
+.Dv O_EXCL
+are specified and the named shared memory object does exist.
+.It Bq Er EACCES
+The required permissions (for reading or reading and writing) are denied.
+.El
+.Pp
+The following errors are defined for
+.Fn shm_unlink :
+.Bl -tag -width Er
+.It Bq Er EFAULT
+The
+.Fa path
+argument points outside the process' allocated address space.
+.It Bq Er ENAMETOOLONG
+The entire pathname exceeded 1023 characters.
+.It Bq Er ENOENT
+The named shared memory object does not exist.
+.It Bq Er EACCES
+The required permissions are denied.
+.Fn shm_unlink
+requires write permission to the shared memory object.
+.El
+.Sh SEE ALSO
+.Xr close 2 ,
+.Xr ftruncate 2 ,
+.Xr fstat 2 ,
+.Xr mmap 2 ,
+.Xr munmap 2
+.Sh STANDARDS
+The
+.Fn shm_open
+and
+.Fn shm_unlink
+functions are believed to conform to
+.St -p1003.1b-93 .
+.Sh HISTORY
+The
+.Fn shm_open
+and
+.Fn shm_unlink
+functions first appeared in
+.Fx 4.3 .
+The functions were reimplemented as system calls using shared memory objects
+directly rather than files in
+.Fx 7.0 .
+.Sh AUTHORS
+.An Garrett A. Wollman Aq wollman@FreeBSD.org
+(C library support and this manual page)
+.Pp
+.An Matthew Dillon Aq dillon@FreeBSD.org
+.Pq Dv MAP_NOSYNC
diff --git a/lib/libc/sys/shmat.2 b/lib/libc/sys/shmat.2
new file mode 100644
index 0000000..8fe340c
--- /dev/null
+++ b/lib/libc/sys/shmat.2
@@ -0,0 +1,123 @@
+.\"
+.\" Copyright (c) 1995 David Hovemeyer <daveho@infocom.com>
+.\"
+.\" All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY EXPRESS OR
+.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+.\" IN NO EVENT SHALL THE DEVELOPERS BE LIABLE FOR ANY DIRECT, INDIRECT,
+.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd August 2, 1995
+.Dt SHMAT 2
+.Os
+.Sh NAME
+.Nm shmat ,
+.Nm shmdt
+.Nd attach or detach shared memory
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In machine/param.h
+.In sys/types.h
+.In sys/ipc.h
+.In sys/shm.h
+.Ft void *
+.Fn shmat "int shmid" "const void *addr" "int flag"
+.Ft int
+.Fn shmdt "const void *addr"
+.Sh DESCRIPTION
+The
+.Fn shmat
+system call
+attaches the shared memory segment identified by
+.Fa shmid
+to the calling process's address space.
+The address where the segment
+is attached is determined as follows:
+.\"
+.\" These are cribbed almost exactly from Stevens, _Advanced Programming in
+.\" the UNIX Environment_.
+.\"
+.Bl -bullet
+.It
+If
+.Fa addr
+is 0, the segment is attached at an address selected by the
+kernel.
+.It
+If
+.Fa addr
+is nonzero and SHM_RND is not specified in
+.Fa flag ,
+the segment is attached the specified address.
+.It
+If
+.Fa addr
+is specified and SHM_RND is specified,
+.Fa addr
+is rounded down to the nearest multiple of SHMLBA.
+.El
+.Pp
+The
+.Fn shmdt
+system call
+detaches the shared memory segment at the address specified by
+.Fa addr
+from the calling process's address space.
+.Sh RETURN VALUES
+Upon success,
+.Fn shmat
+returns the address where the segment is attached; otherwise, -1
+is returned and
+.Va errno
+is set to indicate the error.
+.Pp
+.Rv -std shmdt
+.Sh ERRORS
+The
+.Fn shmat
+system call
+will fail if:
+.Bl -tag -width Er
+.It Bq Er EINVAL
+No shared memory segment was found corresponding to
+.Fa shmid .
+.It Bq Er EINVAL
+The
+.Fa addr
+argument
+was not an acceptable address.
+.El
+.Pp
+The
+.Fn shmdt
+system call
+will fail if:
+.Bl -tag -width Er
+.It Bq Er EINVAL
+The
+.Fa addr
+argument
+does not point to a shared memory segment.
+.El
+.Sh "SEE ALSO"
+.Xr shmctl 2 ,
+.Xr shmget 2
diff --git a/lib/libc/sys/shmctl.2 b/lib/libc/sys/shmctl.2
new file mode 100644
index 0000000..d3299af
--- /dev/null
+++ b/lib/libc/sys/shmctl.2
@@ -0,0 +1,139 @@
+.\"
+.\" Copyright (c) 1995 David Hovemeyer <daveho@infocom.com>
+.\"
+.\" All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY EXPRESS OR
+.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+.\" IN NO EVENT SHALL THE DEVELOPERS BE LIABLE FOR ANY DIRECT, INDIRECT,
+.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd July 17, 1995
+.Dt SHMCTL 2
+.Os
+.Sh NAME
+.Nm shmctl
+.Nd shared memory control
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In machine/param.h
+.In sys/types.h
+.In sys/ipc.h
+.In sys/shm.h
+.Ft int
+.Fn shmctl "int shmid" "int cmd" "struct shmid_ds *buf"
+.Sh DESCRIPTION
+Performs the action specified by
+.Fa cmd
+on the shared memory segment identified by
+.Fa shmid :
+.Bl -tag -width SHM_UNLOCKX
+.It Dv IPC_STAT
+Fetch the segment's
+.Fa "struct shmid_ds" ,
+storing it in the memory pointed to by
+.Fa buf .
+.\"
+.\" XXX need to make sure that this is correct for FreeBSD
+.\"
+.It Dv IPC_SET
+Changes the
+.Fa shm_perm.uid ,
+.Fa shm_perm.gid ,
+and
+.Fa shm_perm.mode
+members of the segment's
+.Fa "struct shmid_ds"
+to match those of the struct pointed to by
+.Fa buf .
+The calling process's effective uid must
+match either
+.Fa shm_perm.uid
+or
+.Fa shm_perm.cuid ,
+or it must have superuser privileges.
+.It Dv IPC_RMID
+Removes the segment from the system.
+The removal will not take
+effect until all processes having attached the segment have exited;
+however, once the IPC_RMID operation has taken place, no further
+processes will be allowed to attach the segment.
+For the operation
+to succeed, the calling process's effective uid must match
+.Fa shm_perm.uid
+or
+.Fa shm_perm.cuid ,
+or the process must have superuser privileges.
+.\" .It Dv SHM_LOCK
+.\" Locks the segment in memory.  The calling process must have
+.\" superuser privileges. Not implemented in FreeBSD.
+.\" .It Dv SHM_UNLOCK
+.\" Unlocks the segment from memory.  The calling process must
+.\" have superuser privileges.  Not implemented in FreeBSD.
+.El
+.Pp
+The
+.Vt shmid_ds
+structure is defined as follows:
+.\"
+.\" I fiddled with the spaces a bit to make it fit well when viewed
+.\" with nroff, but otherwise it is straight from sys/shm.h
+.\"
+.Bd -literal
+struct shmid_ds {
+    struct ipc_perm shm_perm;   /* operation permission structure */
+    size_t          shm_segsz;  /* size of segment in bytes */
+    pid_t           shm_lpid;   /* process ID of last shared memory op */
+    pid_t           shm_cpid;   /* process ID of creator */
+    int             shm_nattch; /* number of current attaches */
+    time_t          shm_atime;  /* time of last shmat() */
+    time_t          shm_dtime;  /* time of last shmdt() */
+    time_t          shm_ctime;  /* time of last change by shmctl() */
+};
+.Ed
+.Sh RETURN VALUES
+.Rv -std shmctl
+.Sh ERRORS
+The
+.Fn shmctl
+system call
+will fail if:
+.Bl -tag -width Er
+.It Bq Er EINVAL
+Invalid operation, or
+no shared memory segment was found corresponding to
+.Fa shmid .
+.\"
+.\" XXX I think the following is right: ipcperm() only returns EPERM
+.\"	when an attempt is made to modify (IPC_M) by a non-creator
+.\"	non-owner
+.It Bq Er EPERM
+The calling process's effective uid does not match the uid of
+the shared memory segment's owner or creator.
+.It Bq Er EACCES
+Permission denied due to mismatch between operation and mode of
+shared memory segment.
+.El
+.Sh "SEE ALSO"
+.Xr shmat 2 ,
+.Xr shmdt 2 ,
+.Xr shmget 2 ,
+.Xr ftok 3
diff --git a/lib/libc/sys/shmget.2 b/lib/libc/sys/shmget.2
new file mode 100644
index 0000000..e7fd6d1
--- /dev/null
+++ b/lib/libc/sys/shmget.2
@@ -0,0 +1,146 @@
+.\"
+.\" Copyright (c) 1995 David Hovemeyer <daveho@infocom.com>
+.\"
+.\" All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY EXPRESS OR
+.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+.\" IN NO EVENT SHALL THE DEVELOPERS BE LIABLE FOR ANY DIRECT, INDIRECT,
+.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd July 3, 1995
+.Dt SHMGET 2
+.Os
+.Sh NAME
+.Nm shmget
+.Nd obtain a shared memory identifier
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In machine/param.h
+.In sys/types.h
+.In sys/ipc.h
+.In sys/shm.h
+.Ft int
+.Fn shmget "key_t key" "size_t size" "int flag"
+.Sh DESCRIPTION
+Based on the values of
+.Fa key
+and
+.Fa flag ,
+.Fn shmget
+returns the identifier of a newly created or previously existing shared
+memory segment.
+.\"
+.\" The following bit about keys and modes also applies to semaphores
+.\" and message queues.
+.\"
+The key
+is analogous to a filename: it provides a handle that names an
+IPC object.
+There are three ways to specify a key:
+.Bl -bullet
+.It
+IPC_PRIVATE may be specified, in which case a new IPC object
+will be created.
+.It
+An integer constant may be specified.
+If no IPC object corresponding
+to
+.Fa key
+is specified and the IPC_CREAT bit is set in
+.Fa flag ,
+a new one will be created.
+.It
+The
+.Xr ftok 3
+may be used to generate a key from a pathname.
+.El
+.Pp
+The mode of a newly created IPC object is determined by
+.Em OR Ns 'ing
+the following constants into the
+.Fa flag
+argument:
+.Bl -tag -width XSHM_WXX6XXX
+.It Dv SHM_R
+Read access for user.
+.It Dv SHM_W
+Write access for user.
+.It Dv ( SHM_R>>3 )
+Read access for group.
+.It Dv ( SHM_W>>3 )
+Write access for group.
+.It Dv ( SHM_R>>6 )
+Read access for other.
+.It Dv ( SHM_W>>6 )
+Write access for other.
+.El
+.\"
+.\" XXX - we should also mention how uid, euid, and gid affect ownership
+.\"	  and use
+.\"
+.\" end section about keys and modes
+.\"
+.Pp
+When creating a new shared memory segment,
+.Fa size
+indicates the desired size of the new segment in bytes.
+The size
+of the segment may be rounded up to a multiple convenient to the
+kernel (i.e., the page size).
+.Sh RETURN VALUES
+Upon successful completion,
+.Fn shmget
+returns the positive integer identifier of a shared memory segment.
+Otherwise, -1 is returned and
+.Va errno
+set to indicate the error.
+.Sh ERRORS
+The
+.Fn shmget
+system call
+will fail if:
+.Bl -tag -width Er
+.\"
+.\" XXX What about ipcperm failing?
+.\"
+.It Bq Er EINVAL
+Size specified is greater than the size of the previously existing segment.
+Size specified is less than the system imposed minimum, or greater than
+the system imposed maximum.
+.It Bq Er ENOENT
+No shared memory segment was found matching
+.Fa key ,
+and IPC_CREAT was not specified.
+.It Bq Er ENOSPC
+The kernel was unable to allocate enough memory to
+satisfy the request.
+.It Bq Er EEXIST
+IPC_CREAT and IPC_EXCL were specified, and a shared memory segment
+corresponding to
+.Fa key
+already exists.
+.El
+.Sh "SEE ALSO"
+.Xr shmat 2 ,
+.Xr shmctl 2 ,
+.Xr shmdt 2 ,
+.Xr ftok 3
diff --git a/lib/libc/sys/shutdown.2 b/lib/libc/sys/shutdown.2
new file mode 100644
index 0000000..70211ff
--- /dev/null
+++ b/lib/libc/sys/shutdown.2
@@ -0,0 +1,191 @@
+.\" Copyright (c) 2007 Bruce M. Simpson.
+.\" Copyright (c) 1983, 1991, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"     @(#)shutdown.2	8.1 (Berkeley) 6/4/93
+.\" $FreeBSD$
+.\"
+.Dd March 5, 2007
+.Dt SHUTDOWN 2
+.Os
+.Sh NAME
+.Nm shutdown
+.Nd disable sends and/or receives on a socket
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In sys/types.h
+.In sys/socket.h
+.Ft int
+.Fn shutdown "int s" "int how"
+.Sh DESCRIPTION
+The
+.Fn shutdown
+system call disables sends or receives on a socket.
+The
+.Fa how
+argument specifies the type of shutdown.
+Possible values are:
+.Bl -tag -width ".Dv SHUT_RDWR"
+.It Dv SHUT_RD
+Further receives will be disallowed.
+.It Dv SHUT_WR
+Further sends will be disallowed.
+This may cause actions specific to the protocol family of the socket
+.Fa s
+to happen; see
+.Sx IMPLEMENTATION NOTES .
+.It Dv SHUT_RDWR
+Further sends and receives will be disallowed.
+Implies
+.Dv SHUT_WR .
+.El
+.Pp
+If the file descriptor
+.Fa s
+is associated with a
+.Dv SOCK_STREAM
+socket, all or part of the full-duplex connection will be shut down.
+.\"
+.Sh IMPLEMENTATION NOTES
+The following protocol specific actions apply to the use of
+.Dv SHUT_WR
+(and potentially also
+.Dv SHUT_RDWR ) ,
+based on the properties of the socket associated with the file descriptor
+.Fa s .
+.Bl -column ".Dv PF_INET6" ".Dv SOCK_STREAM" ".Dv IPPROTO_SCTP"
+.It Sy Domain Ta Sy Type Ta Sy Protocol Ta Sy Return value and action
+.It Dv PF_INET Ta Dv SOCK_DGRAM Ta Dv IPPROTO_SCTP Ta
+Return \-1.
+The global variable
+.Va errno
+will be set to
+.Er EOPNOTSUPP .
+.It Dv PF_INET Ta Dv SOCK_DGRAM Ta Dv IPPROTO_UDP Ta
+Return 0.
+ICMP messages will
+.Em not
+be generated.
+.It Dv PF_INET Ta Dv SOCK_STREAM Ta Dv IPPROTO_SCTP Ta
+Return 0.
+Send queued data and tear down association.
+.It Dv PF_INET Ta Dv SOCK_STREAM Ta Dv IPPROTO_TCP Ta
+Return 0.
+Send queued data, wait for ACK, then send FIN.
+.It Dv PF_INET6 Ta Dv SOCK_DGRAM Ta Dv IPPROTO_SCTP Ta
+Return \-1.
+The global variable
+.Va errno
+will be set to
+.Er EOPNOTSUPP .
+.It Dv PF_INET6 Ta Dv SOCK_DGRAM Ta Dv IPPROTO_UDP Ta
+Return 0.
+ICMP messages will
+.Em not
+be generated.
+.It Dv PF_INET6 Ta Dv SOCK_STREAM Ta Dv IPPROTO_SCTP Ta
+Return 0.
+Send queued data and tear down association.
+.It Dv PF_INET6 Ta Dv SOCK_STREAM Ta Dv IPPROTO_TCP Ta
+Return 0.
+Send queued data, wait for ACK, then send FIN.
+.El
+.\"
+.Sh RETURN VALUES
+.Rv -std shutdown
+.Sh ERRORS
+The
+.Fn shutdown
+system call fails if:
+.Bl -tag -width Er
+.It Bq Er EBADF
+The
+.Fa s
+argument is not a valid file descriptor.
+.It Bq Er EINVAL
+The
+.Fa how
+argument is invalid.
+.It Bq Er EOPNOTSUPP
+The socket associated with the file descriptor
+.Fa s
+does not support this operation.
+.It Bq Er ENOTCONN
+The
+.Fa s
+argument specifies a
+.Dv SOCK_STREAM
+socket which is not connected.
+.It Bq Er ENOTSOCK
+The
+.Fa s
+argument does not refer to a socket.
+.El
+.Sh SEE ALSO
+.Xr connect 2 ,
+.Xr socket 2 ,
+.Xr inet 4 ,
+.Xr inet6 4
+.Sh STANDARDS
+The
+.Fn shutdown
+system call is expected to comply with
+.St -p1003.1g-2000 ,
+when finalized.
+.Sh HISTORY
+The
+.Fn shutdown
+system call appeared in
+.Bx 4.2 .
+The
+.Dv SHUT_RD , SHUT_WR ,
+and
+.Dv SHUT_RDWR
+constants appeared in
+.St -p1003.1g-2000 .
+.Sh AUTHORS
+.An -nosplit
+This manual page was updated by
+.An Bruce M. Simpson Aq bms@FreeBSD.org
+to reflect how
+.Fn shutdown
+behaves with
+.Dv PF_INET
+and
+.Dv PF_INET6
+sockets.
+.Sh BUGS
+The ICMP
+.Dq Li "port unreachable"
+message should be generated in response to
+datagrams received on a local port to which
+.Fa s
+is bound
+after
+.Fn shutdown
+is called.
diff --git a/lib/libc/sys/sigaction.2 b/lib/libc/sys/sigaction.2
new file mode 100644
index 0000000..47b3a72
--- /dev/null
+++ b/lib/libc/sys/sigaction.2
@@ -0,0 +1,666 @@
+.\" Copyright (c) 1980, 1990, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"	From: @(#)sigaction.2	8.2 (Berkeley) 4/3/94
+.\" $FreeBSD$
+.\"
+.Dd April 18, 2010
+.Dt SIGACTION 2
+.Os
+.Sh NAME
+.Nm sigaction
+.Nd software signal facilities
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In signal.h
+.Bd -literal
+struct  sigaction {
+        void    (*sa_handler)(int);
+        void    (*sa_sigaction)(int, siginfo_t *, void *);
+        int     sa_flags;               /* see signal options below */
+        sigset_t sa_mask;               /* signal mask to apply */
+};
+.Ed
+.Ft int
+.Fo sigaction
+.Fa "int sig"
+.Fa "const struct sigaction * restrict act"
+.Fa "struct sigaction * restrict oact"
+.Fc
+.Sh DESCRIPTION
+The system defines a set of signals that may be delivered to a process.
+Signal delivery resembles the occurrence of a hardware interrupt:
+the signal is normally blocked from further occurrence, the current process
+context is saved, and a new one is built.
+A process may specify a
+.Em handler
+to which a signal is delivered, or specify that a signal is to be
+.Em ignored .
+A process may also specify that a default action is to be taken
+by the system when a signal occurs.
+A signal may also be
+.Em blocked ,
+in which case its delivery is postponed until it is
+.Em unblocked .
+The action to be taken on delivery is determined at the time
+of delivery.
+Normally, signal handlers execute on the current stack
+of the process.
+This may be changed, on a per-handler basis,
+so that signals are taken on a special
+.Em "signal stack" .
+.Pp
+Signal routines normally execute with the signal that caused their
+invocation
+.Em blocked ,
+but other signals may yet occur.
+A global
+.Em "signal mask"
+defines the set of signals currently blocked from delivery
+to a process.
+The signal mask for a process is initialized
+from that of its parent (normally empty).
+It may be changed with a
+.Xr sigprocmask 2
+call, or when a signal is delivered to the process.
+.Pp
+When a signal
+condition arises for a process, the signal is added to a set of
+signals pending for the process.
+If the signal is not currently
+.Em blocked
+by the process then it is delivered to the process.
+Signals may be delivered any time a process enters the operating system
+(e.g., during a system call, page fault or trap, or clock interrupt).
+If multiple signals are ready to be delivered at the same time,
+any signals that could be caused by traps are delivered first.
+Additional signals may be processed at the same time, with each
+appearing to interrupt the handlers for the previous signals
+before their first instructions.
+The set of pending signals is returned by the
+.Xr sigpending 2
+system call.
+When a caught signal
+is delivered, the current state of the process is saved,
+a new signal mask is calculated (as described below),
+and the signal handler is invoked.
+The call to the handler
+is arranged so that if the signal handling routine returns
+normally the process will resume execution in the context
+from before the signal's delivery.
+If the process wishes to resume in a different context, then it
+must arrange to restore the previous context itself.
+.Pp
+When a signal is delivered to a process a new signal mask is
+installed for the duration of the process' signal handler
+(or until a
+.Xr sigprocmask 2
+system call is made).
+This mask is formed by taking the union of the current signal mask set,
+the signal to be delivered, and
+the signal mask associated with the handler to be invoked.
+.Pp
+The
+.Fn sigaction
+system call
+assigns an action for a signal specified by
+.Fa sig .
+If
+.Fa act
+is non-zero, it
+specifies an action
+.Dv ( SIG_DFL ,
+.Dv SIG_IGN ,
+or a handler routine) and mask
+to be used when delivering the specified signal.
+If
+.Fa oact
+is non-zero, the previous handling information for the signal
+is returned to the user.
+.Pp
+The above declaration of
+.Vt "struct sigaction"
+is not literal.
+It is provided only to list the accessible members.
+See
+.In sys/signal.h
+for the actual definition.
+In particular, the storage occupied by sa_handler and sa_sigaction overlaps,
+and an application can not use both simultaneously.
+.Pp
+Once a signal handler is installed, it normally remains installed
+until another
+.Fn sigaction
+system call is made, or an
+.Xr execve 2
+is performed.
+A signal-specific default action may be reset by
+setting
+.Va sa_handler
+to
+.Dv SIG_DFL .
+The defaults are process termination, possibly with core dump;
+no action; stopping the process; or continuing the process.
+See the signal list below for each signal's default action.
+If
+.Va sa_handler
+is
+.Dv SIG_DFL ,
+the default action for the signal is to discard the signal,
+and if a signal is pending,
+the pending signal is discarded even if the signal is masked.
+If
+.Va sa_handler
+is set to
+.Dv SIG_IGN
+current and pending instances
+of the signal are ignored and discarded.
+.Pp
+Options may be specified by setting
+.Va sa_flags .
+The meaning of the various bits is as follows:
+.Bl -tag -offset indent -width SA_RESETHANDXX
+.It Dv SA_NOCLDSTOP
+If this bit is set when installing a catching function
+for the
+.Dv SIGCHLD
+signal,
+the
+.Dv SIGCHLD
+signal will be generated only when a child process exits,
+not when a child process stops.
+.It Dv SA_NOCLDWAIT
+If this bit is set when calling
+.Fn sigaction
+for the
+.Dv SIGCHLD
+signal, the system will not create zombie processes when children of
+the calling process exit.
+If the calling process subsequently issues a
+.Xr wait 2
+(or equivalent), it blocks until all of the calling process's child
+processes terminate, and then returns a value of \-1 with
+.Va errno
+set to
+.Er ECHILD .
+The same effect of avoiding zombie creation can also be achieved by setting
+.Va sa_handler
+for
+.Dv SIGCHLD
+to
+.Dv SIG_IGN .
+.It Dv SA_ONSTACK
+If this bit is set, the system will deliver the signal to the process
+on a
+.Em "signal stack" ,
+specified with
+.Xr sigaltstack 2 .
+.It Dv SA_NODEFER
+If this bit is set, further occurrences of the delivered signal are
+not masked during the execution of the handler.
+.It Dv SA_RESETHAND
+If this bit is set, the handler is reset back to
+.Dv SIG_DFL
+at the moment the signal is delivered.
+.It Dv SA_RESTART
+See paragraph below.
+.It Dv SA_SIGINFO
+If this bit is set, the handler function is assumed to be pointed to by the
+.Va sa_sigaction
+member of
+.Vt "struct sigaction"
+and should match the prototype shown above or as below in
+.Sx EXAMPLES .
+This bit should not be set when assigning
+.Dv SIG_DFL
+or
+.Dv SIG_IGN .
+.El
+.Pp
+If a signal is caught during the system calls listed below,
+the call may be forced to terminate
+with the error
+.Er EINTR ,
+the call may return with a data transfer shorter than requested,
+or the call may be restarted.
+Restart of pending calls is requested
+by setting the
+.Dv SA_RESTART
+bit in
+.Va sa_flags .
+The affected system calls include
+.Xr open 2 ,
+.Xr read 2 ,
+.Xr write 2 ,
+.Xr sendto 2 ,
+.Xr recvfrom 2 ,
+.Xr sendmsg 2
+and
+.Xr recvmsg 2
+on a communications channel or a slow device (such as a terminal,
+but not a regular file)
+and during a
+.Xr wait 2
+or
+.Xr ioctl 2 .
+However, calls that have already committed are not restarted,
+but instead return a partial success (for example, a short read count).
+.Pp
+After a
+.Xr fork 2
+or
+.Xr vfork 2
+all signals, the signal mask, the signal stack,
+and the restart/interrupt flags are inherited by the child.
+.Pp
+The
+.Xr execve 2
+system call reinstates the default
+action for all signals which were caught and
+resets all signals to be caught on the user stack.
+Ignored signals remain ignored;
+the signal mask remains the same;
+signals that restart pending system calls continue to do so.
+.Pp
+The following is a list of all signals
+with names as in the include file
+.In signal.h :
+.Bl -column SIGVTALARMXX "create core imagexxx"
+.It Sy "NAME	Default Action	Description"
+.It Dv SIGHUP No "	terminate process" "	terminal line hangup"
+.It Dv SIGINT No "	terminate process" "	interrupt program"
+.It Dv SIGQUIT No "	create core image" "	quit program"
+.It Dv SIGILL No "	create core image" "	illegal instruction"
+.It Dv SIGTRAP No "	create core image" "	trace trap"
+.It Dv SIGABRT No "	create core image" Ta Xr abort 3
+call (formerly
+.Dv SIGIOT )
+.It Dv SIGEMT No "	create core image" "	emulate instruction executed"
+.It Dv SIGFPE No "	create core image" "	floating-point exception"
+.It Dv SIGKILL No "	terminate process" "	kill program"
+.It Dv SIGBUS No "	create core image" "	bus error"
+.It Dv SIGSEGV No "	create core image" "	segmentation violation"
+.It Dv SIGSYS No "	create core image" "	non-existent system call invoked"
+.It Dv SIGPIPE No "	terminate process" "	write on a pipe with no reader"
+.It Dv SIGALRM No "	terminate process" "	real-time timer expired"
+.It Dv SIGTERM No "	terminate process" "	software termination signal"
+.It Dv SIGURG No "	discard signal" "	urgent condition present on socket"
+.It Dv SIGSTOP No "	stop process" "	stop (cannot be caught or ignored)"
+.It Dv SIGTSTP No "	stop process" "	stop signal generated from keyboard"
+.It Dv SIGCONT No "	discard signal" "	continue after stop"
+.It Dv SIGCHLD No "	discard signal" "	child status has changed"
+.It Dv SIGTTIN No "	stop process" "	background read attempted from control terminal"
+.It Dv SIGTTOU No "	stop process" "	background write attempted to control terminal"
+.It Dv SIGIO No "	discard signal" Tn "	I/O"
+is possible on a descriptor (see
+.Xr fcntl 2 )
+.It Dv SIGXCPU No "	terminate process" "	cpu time limit exceeded (see"
+.Xr setrlimit 2 )
+.It Dv SIGXFSZ No "	terminate process" "	file size limit exceeded (see"
+.Xr setrlimit 2 )
+.It Dv SIGVTALRM No "	terminate process" "	virtual time alarm (see"
+.Xr setitimer 2 )
+.It Dv SIGPROF No "	terminate process" "	profiling timer alarm (see"
+.Xr setitimer 2 )
+.It Dv SIGWINCH No "	discard signal" "	Window size change"
+.It Dv SIGINFO No "	discard signal" "	status request from keyboard"
+.It Dv SIGUSR1 No "	terminate process" "	User defined signal 1"
+.It Dv SIGUSR2 No "	terminate process" "	User defined signal 2"
+.El
+.Sh NOTE
+The
+.Va sa_mask
+field specified in
+.Fa act
+is not allowed to block
+.Dv SIGKILL
+or
+.Dv SIGSTOP .
+Any attempt to do so will be silently ignored.
+.Pp
+The following functions are either reentrant or not interruptible
+by signals and are async-signal safe.
+Therefore applications may
+invoke them, without restriction, from signal-catching functions:
+.Pp
+Base Interfaces:
+.Pp
+.Fn _exit ,
+.Fn access ,
+.Fn alarm ,
+.Fn cfgetispeed ,
+.Fn cfgetospeed ,
+.Fn cfsetispeed ,
+.Fn cfsetospeed ,
+.Fn chdir ,
+.Fn chmod ,
+.Fn chown ,
+.Fn close ,
+.Fn creat ,
+.Fn dup ,
+.Fn dup2 ,
+.Fn execle ,
+.Fn execve ,
+.Fn fcntl ,
+.Fn fork ,
+.Fn fpathconf ,
+.Fn fstat ,
+.Fn fsync ,
+.Fn getegid ,
+.Fn geteuid ,
+.Fn getgid ,
+.Fn getgroups ,
+.Fn getpgrp ,
+.Fn getpid ,
+.Fn getppid ,
+.Fn getuid ,
+.Fn kill ,
+.Fn link ,
+.Fn lseek ,
+.Fn mkdir ,
+.Fn mkfifo ,
+.Fn open ,
+.Fn pathconf ,
+.Fn pause ,
+.Fn pipe ,
+.Fn raise ,
+.Fn read ,
+.Fn rename ,
+.Fn rmdir ,
+.Fn setgid ,
+.Fn setpgid ,
+.Fn setsid ,
+.Fn setuid ,
+.Fn sigaction ,
+.Fn sigaddset ,
+.Fn sigdelset ,
+.Fn sigemptyset ,
+.Fn sigfillset ,
+.Fn sigismember ,
+.Fn signal ,
+.Fn sigpending ,
+.Fn sigprocmask ,
+.Fn sigsuspend ,
+.Fn sleep ,
+.Fn stat ,
+.Fn sysconf ,
+.Fn tcdrain ,
+.Fn tcflow ,
+.Fn tcflush ,
+.Fn tcgetattr ,
+.Fn tcgetpgrp ,
+.Fn tcsendbreak ,
+.Fn tcsetattr ,
+.Fn tcsetpgrp ,
+.Fn time ,
+.Fn times ,
+.Fn umask ,
+.Fn uname ,
+.Fn unlink ,
+.Fn utime ,
+.Fn wait ,
+.Fn waitpid ,
+.Fn write .
+.Pp
+Realtime Interfaces:
+.Pp
+.Fn aio_error ,
+.Fn clock_gettime ,
+.Fn sigpause ,
+.Fn timer_getoverrun ,
+.Fn aio_return ,
+.Fn fdatasync ,
+.Fn sigqueue ,
+.Fn timer_gettime ,
+.Fn aio_suspend ,
+.Fn sem_post ,
+.Fn sigset ,
+.Fn timer_settime .
+.Pp
+.Tn ANSI C
+Interfaces:
+.Pp
+.Fn strcpy ,
+.Fn strcat ,
+.Fn strncpy ,
+.Fn strncat ,
+and perhaps some others.
+.Pp
+Extension Interfaces:
+.Pp
+.Fn strlcpy ,
+.Fn strlcat .
+.Pp
+All functions not in the above lists are considered to be unsafe
+with respect to signals.
+That is to say, the behaviour of such
+functions when called from a signal handler is undefined.
+In general though, signal handlers should do little more than set a
+flag; most other actions are not safe.
+.Pp
+Also, it is good practice to make a copy of the global variable
+.Va errno
+and restore it before returning from the signal handler.
+This protects against the side effect of
+.Va errno
+being set by functions called from inside the signal handler.
+.Sh RETURN VALUES
+.Rv -std sigaction
+.Sh EXAMPLES
+There are three possible prototypes the handler may match:
+.Bl -tag -offset indent -width short
+.It Tn ANSI C :
+.Ft void
+.Fn handler int ;
+.It Traditional BSD style:
+.Ft void
+.Fn handler int "int code" "struct sigcontext *scp" ;
+.It Tn POSIX Dv SA_SIGINFO :
+.Ft void
+.Fn handler int "siginfo_t *info" "ucontext_t *uap" ;
+.El
+.Pp
+The handler function should match the
+.Dv SA_SIGINFO
+prototype if the
+.Dv SA_SIGINFO
+bit is set in
+.Va sa_flags .
+It then should be pointed to by the
+.Va sa_sigaction
+member of
+.Vt "struct sigaction" .
+Note that you should not assign
+.Dv SIG_DFL
+or
+.Dv SIG_IGN
+this way.
+.Pp
+If the
+.Dv SA_SIGINFO
+flag is not set, the handler function should match
+either the
+.Tn ANSI C
+or traditional
+.Bx
+prototype and be pointed to by
+the
+.Va sa_handler
+member of
+.Vt "struct sigaction" .
+In practice,
+.Fx
+always sends the three arguments of the latter and since the
+.Tn ANSI C
+prototype is a subset, both will work.
+The
+.Va sa_handler
+member declaration in
+.Fx
+include files is that of
+.Tn ANSI C
+(as required by
+.Tn POSIX ) ,
+so a function pointer of a
+.Bx Ns -style
+function needs to be casted to
+compile without warning.
+The traditional
+.Bx
+style is not portable and since its capabilities
+are a full subset of a
+.Dv SA_SIGINFO
+handler,
+its use is deprecated.
+.Pp
+The
+.Fa sig
+argument is the signal number, one of the
+.Dv SIG...
+values from
+.In signal.h .
+.Pp
+The
+.Fa code
+argument of the
+.Bx Ns -style
+handler and the
+.Va si_code
+member of the
+.Fa info
+argument to a
+.Dv SA_SIGINFO
+handler contain a numeric code explaining the
+cause of the signal, usually one of the
+.Dv SI_...
+values from
+.In sys/signal.h
+or codes specific to a signal, i.e., one of the
+.Dv FPE_...
+values for
+.Dv SIGFPE .
+.Pp
+The
+.Fa scp
+argument to a
+.Bx Ns -style
+handler points to an instance of
+.Vt "struct sigcontext" .
+.Pp
+The
+.Fa uap
+argument to a
+.Tn POSIX
+.Dv SA_SIGINFO
+handler points to an instance of
+ucontext_t.
+.Sh ERRORS
+The
+.Fn sigaction
+system call
+will fail and no new signal handler will be installed if one
+of the following occurs:
+.Bl -tag -width Er
+.It Bq Er EFAULT
+Either
+.Fa act
+or
+.Fa oact
+points to memory that is not a valid part of the process
+address space.
+.It Bq Er EINVAL
+The
+.Fa sig
+argument
+is not a valid signal number.
+.It Bq Er EINVAL
+An attempt is made to ignore or supply a handler for
+.Dv SIGKILL
+or
+.Dv SIGSTOP .
+.El
+.Sh SEE ALSO
+.Xr kill 1 ,
+.Xr kill 2 ,
+.Xr ptrace 2 ,
+.Xr sigaltstack 2 ,
+.Xr sigpending 2 ,
+.Xr sigprocmask 2 ,
+.Xr sigsuspend 2 ,
+.Xr wait 2 ,
+.Xr fpsetmask 3 ,
+.Xr setjmp 3 ,
+.Xr siginfo 3 ,
+.Xr siginterrupt 3 ,
+.Xr sigsetops 3 ,
+.Xr ucontext 3 ,
+.Xr tty 4
+.Sh STANDARDS
+The
+.Fn sigaction
+system call is expected to conform to
+.St -p1003.1-90 .
+The
+.Dv SA_ONSTACK
+and
+.Dv SA_RESTART
+flags are Berkeley extensions,
+as are the signals,
+.Dv SIGTRAP ,
+.Dv SIGEMT ,
+.Dv SIGBUS ,
+.Dv SIGSYS ,
+.Dv SIGURG ,
+.Dv SIGIO ,
+.Dv SIGXCPU ,
+.Dv SIGXFSZ ,
+.Dv SIGVTALRM ,
+.Dv SIGPROF ,
+.Dv SIGWINCH ,
+and
+.Dv SIGINFO .
+Those signals are available on most
+.Bx Ns \-derived
+systems.
+The
+.Dv SA_NODEFER
+and
+.Dv SA_RESETHAND
+flags are intended for backwards compatibility with other operating
+systems.
+The
+.Dv SA_NOCLDSTOP ,
+and
+.Dv SA_NOCLDWAIT
+.\" and
+.\" SA_SIGINFO
+flags are featuring options commonly found in other operating systems.
+The flags are approved by
+.St -susv2 ,
+along with the option to avoid zombie creation by ignoring
+.Dv SIGCHLD .
diff --git a/lib/libc/sys/sigaltstack.2 b/lib/libc/sys/sigaltstack.2
new file mode 100644
index 0000000..d9cb273
--- /dev/null
+++ b/lib/libc/sys/sigaltstack.2
@@ -0,0 +1,162 @@
+.\" Copyright (c) 1983, 1991, 1992, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"     @(#)sigaltstack.2	8.2 (Berkeley) 5/1/95
+.\" $FreeBSD$
+.\"
+.Dd May 6, 2010
+.Dt SIGALTSTACK 2
+.Os
+.Sh NAME
+.Nm sigaltstack
+.Nd set and/or get signal stack context
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In signal.h
+.Bd -literal
+typedef struct {
+        char    *ss_sp;
+        size_t  ss_size;
+        int     ss_flags;
+} stack_t;
+.Ed
+.Ft int
+.Fn sigaltstack "const stack_t * restrict ss" "stack_t * restrict oss"
+.Sh DESCRIPTION
+The
+.Fn sigaltstack
+system call
+allows defining an alternate stack on which signals
+are to be processed for the current thread.
+If
+.Fa ss
+is non-zero,
+it specifies a pointer to and the size of a
+.Em "signal stack"
+on which to deliver signals.
+When a signal's action indicates its handler
+should execute on the signal stack (specified with a
+.Xr sigaction 2
+system call), the system checks to see
+if the thread is currently executing on that stack.
+If the thread is not currently executing on the signal stack,
+the system arranges a switch to the signal stack for the
+duration of the signal handler's execution.
+.Pp
+An active stack cannot be modified.
+.Pp
+If
+.Dv SS_DISABLE
+is set in
+.Fa ss_flags ,
+.Fa ss_sp
+and
+.Fa ss_size
+are ignored and the signal stack will be disabled.
+A disabled stack will cause all signals to be
+taken on the regular user stack.
+If the stack is later re-enabled then all signals that were specified
+to be processed on an alternate stack will resume doing so.
+.Pp
+If
+.Fa oss
+is non-zero, the current signal stack state is returned.
+The
+.Fa ss_flags
+field will contain the value
+.Dv SS_ONSTACK
+if the thread is currently on a signal stack and
+.Dv SS_DISABLE
+if the signal stack is currently disabled.
+.Sh NOTES
+The value
+.Dv SIGSTKSZ
+is defined to be the number of bytes/chars that would be used to cover
+the usual case when allocating an alternate stack area.
+The following code fragment is typically used to allocate an alternate stack.
+.Bd -literal -offset indent
+if ((sigstk.ss_sp = malloc(SIGSTKSZ)) == NULL)
+	/* error return */
+sigstk.ss_size = SIGSTKSZ;
+sigstk.ss_flags = 0;
+if (sigaltstack(&sigstk, NULL) < 0)
+	perror("sigaltstack");
+.Ed
+An alternative approach is provided for programs with signal handlers
+that require a specific amount of stack space other than the default size.
+The value
+.Dv MINSIGSTKSZ
+is defined to be the number of bytes/chars that is required by
+the operating system to implement the alternate stack feature.
+In computing an alternate stack size,
+programs should add
+.Dv MINSIGSTKSZ
+to their stack requirements to allow for the operating system overhead.
+.Pp
+Signal stacks are automatically adjusted for the direction of stack
+growth and alignment requirements.
+Signal stacks may or may not be protected by the hardware and
+are not ``grown'' automatically as is done for the normal stack.
+If the stack overflows and this space is not protected
+unpredictable results may occur.
+.Sh RETURN VALUES
+.Rv -std sigaltstack
+.Sh ERRORS
+The
+.Fn sigaltstack
+system call
+will fail and the signal stack context will remain unchanged
+if one of the following occurs.
+.Bl -tag -width Er
+.It Bq Er EFAULT
+Either
+.Fa ss
+or
+.Fa oss
+points to memory that is not a valid part of the process
+address space.
+.It Bq Er EPERM
+An attempt was made to modify an active stack.
+.It Bq Er EINVAL
+The
+.Fa ss_flags
+field was invalid.
+.It Bq Er ENOMEM
+Size of alternate stack area is less than or equal to
+.Dv MINSIGSTKSZ .
+.El
+.Sh SEE ALSO
+.Xr sigaction 2 ,
+.Xr setjmp 3
+.Sh HISTORY
+The predecessor to
+.Fn sigaltstack ,
+the
+.Fn sigstack
+system call, appeared in
+.Bx 4.2 .
diff --git a/lib/libc/sys/sigpending.2 b/lib/libc/sys/sigpending.2
new file mode 100644
index 0000000..37f92d8
--- /dev/null
+++ b/lib/libc/sys/sigpending.2
@@ -0,0 +1,77 @@
+.\" Copyright (c) 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" This code is derived from software contributed to Berkeley by
+.\" Berkeley Software Design, Inc.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"	@(#)sigpending.2	8.3 (Berkeley) 1/12/94
+.\" $FreeBSD$
+.\"
+.Dd January 12, 1994
+.Dt SIGPENDING 2
+.Os
+.Sh NAME
+.Nm sigpending
+.Nd get pending signals
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In signal.h
+.Ft int
+.Fn sigpending "sigset_t *set"
+.Sh DESCRIPTION
+The
+.Fn sigpending
+system call returns a mask of the signals pending for delivery
+to the calling process in the location indicated by
+.Fa set .
+Signals may be pending because they are currently masked,
+or transiently before delivery (although the latter case is not
+normally detectable).
+.Sh RETURN VALUES
+.Rv -std sigpending
+.Sh ERRORS
+The
+.Fn sigpending
+system call
+will fail if:
+.Bl -tag -width Er
+.It Bq Er EFAULT
+The
+.Fa set
+argument specified an invalid address.
+.El
+.Sh SEE ALSO
+.Xr sigaction 2 ,
+.Xr sigprocmask 2 ,
+.Xr sigsuspend 2 ,
+.Xr sigsetops 3
+.Sh STANDARDS
+The
+.Fn sigpending
+system call is expected to conform to
+.St -p1003.1-90 .
diff --git a/lib/libc/sys/sigprocmask.2 b/lib/libc/sys/sigprocmask.2
new file mode 100644
index 0000000..f7c8335
--- /dev/null
+++ b/lib/libc/sys/sigprocmask.2
@@ -0,0 +1,131 @@
+.\" Copyright (c) 1983, 1991, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"	@(#)sigprocmask.2	8.1 (Berkeley) 6/4/93
+.\" $FreeBSD$
+.\"
+.Dd May 7, 2010
+.Dt SIGPROCMASK 2
+.Os
+.Sh NAME
+.Nm sigprocmask
+.Nd manipulate current signal mask
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In signal.h
+.Ft int
+.Fo sigprocmask
+.Fa "int how"
+.Fa "const sigset_t * restrict set"
+.Fa "sigset_t * restrict oset"
+.Fc
+.Sh DESCRIPTION
+The
+.Fn sigprocmask
+system call examines and/or changes the current signal mask (those signals
+that are blocked from delivery).
+Signals are blocked if they are members of the current signal mask set.
+.Pp
+If
+.Fa set
+is not null, the action of
+.Fn sigprocmask
+depends on the value of the
+.Fa how
+argument.
+The signal mask is changed as a function of the specified
+.Fa set
+and the current mask.
+The function is specified by
+.Fa how
+using one of the following values from
+.In signal.h :
+.Bl -tag -width SIG_UNBLOCK
+.It Dv SIG_BLOCK
+The new mask is the union of the current mask and the specified
+.Fa set .
+.It Dv SIG_UNBLOCK
+The new mask is the intersection of the current mask
+and the complement of the specified
+.Fa set .
+.It Dv SIG_SETMASK
+The current mask is replaced by the specified
+.Fa set .
+.El
+.Pp
+If
+.Fa oset
+is not null, it is set to
+the previous value of the signal mask.
+When
+.Fa set
+is null,
+the value of
+.Fa how
+is insignificant and the mask remains unset
+providing a way to examine the signal mask without modification.
+.Pp
+The system
+quietly disallows
+.Dv SIGKILL
+or
+.Dv SIGSTOP
+to be blocked.
+.Pp
+In threaded applications,
+.Xr pthread_sigmask 3
+must be used instead of
+.Fn sigprocmask .
+.Sh RETURN VALUES
+.Rv -std sigprocmask
+.Sh ERRORS
+The
+.Fn sigprocmask
+system call will fail and the signal mask will be unchanged if one
+of the following occurs:
+.Bl -tag -width Er
+.It Bq Er EINVAL
+The
+.Fa how
+argument
+has a value other than those listed here.
+.El
+.Sh SEE ALSO
+.Xr kill 2 ,
+.Xr sigaction 2 ,
+.Xr sigpending 2 ,
+.Xr sigsuspend 2 ,
+.Xr fpsetmask 3 ,
+.Xr pthread_sigmask 3 ,
+.Xr sigsetops 3
+.Sh STANDARDS
+The
+.Fn sigprocmask
+system call is expected to
+conform to
+.St -p1003.1-90 .
diff --git a/lib/libc/sys/sigqueue.2 b/lib/libc/sys/sigqueue.2
new file mode 100644
index 0000000..780b6a0
--- /dev/null
+++ b/lib/libc/sys/sigqueue.2
@@ -0,0 +1,148 @@
+.\" Copyright (c) 2005 David Xu <davidxu@FreeBSD.org>
+.\" All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice(s), this list of conditions and the following disclaimer as
+.\"    the first lines of this file unmodified other than the possible
+.\"    addition of one or more copyright notices.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice(s), this list of conditions and the following disclaimer in
+.\"    the documentation and/or other materials provided with the
+.\"    distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) ``AS IS'' AND ANY
+.\" EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+.\" PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) BE
+.\" LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
+.\" BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+.\" WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
+.\" OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
+.\" EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd November 11, 2005
+.Dt SIGQUEUE 2
+.Os
+.Sh NAME
+.Nm sigqueue
+.Nd "queue a signal to a process (REALTIME)"
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In signal.h
+.Ft int
+.Fn sigqueue "pid_t pid" "int signo" "const union sigval value"
+.Sh DESCRIPTION
+The
+.Fn sigqueue
+system call causes the signal specified by
+.Fa signo
+to be sent with the value specified by
+.Fa value
+to the process specified by
+.Fa pid .
+If
+.Fa signo
+is zero (the null signal), error checking is performed but
+no signal is actually sent.
+The null signal can be used to check the
+validity of PID.
+.Pp
+The conditions required for a process to have permission to queue a
+signal to another process are the same as for the
+.Xr kill 2
+system call.
+The
+.Fn sigqueue
+system call queues a signal to a single process specified by the
+.Fa pid
+argument.
+.Pp
+The
+.Fn sigqueue
+system call returns immediately.
+If the resources were
+available to queue the signal, the signal will be queued and sent to
+the receiving process.
+.Pp
+If the value of
+.Fa pid
+causes
+.Fa signo
+to be generated for the sending process, and if
+.Fa signo
+is not blocked for the calling thread and if no other thread has
+.Fa signo
+unblocked or is waiting in a
+.Fn sigwait
+system call for
+.Fa signo ,
+either
+.Fa signo
+or at least the pending, unblocked signal will be delivered to the
+calling thread before
+.Fn sigqueue
+returns.
+Should any multiple pending signals in the range
+.Dv SIGRTMIN
+to
+.Dv SIGRTMAX
+be selected for delivery, it is the lowest numbered
+one.
+The selection order between realtime and non-realtime signals, or
+between multiple pending non-realtime signals, is unspecified.
+.Sh RETURN VALUES
+.Rv -std
+.Sh ERRORS
+The
+.Fn sigqueue
+system call
+will fail if:
+.Bl -tag -width Er
+.It Bq Er EAGAIN
+No resources are available to queue the signal.
+The process has already
+queued
+.Brq Dv SIGQUEUE_MAX
+signals that are still pending at the receiver(s),
+or a system-wide resource limit has been exceeded.
+.It Bq Er EINVAL
+The value of the
+.Fa signo
+argument is an invalid or unsupported signal number.
+.It Bq Er EEPERM
+The process does not have the appropriate privilege to send the signal
+to the receiving process.
+.It Bq Er ESRCH
+The process
+.Fa pid
+does not exist.
+.El
+.Sh SEE ALSO
+.Xr sigaction 2 ,
+.Xr sigpending 2 ,
+.Xr sigqueue 2 ,
+.Xr sigsuspend 2 ,
+.Xr sigtimedwait 2 ,
+.Xr sigwait 2 ,
+.Xr sigwaitinfo 2 ,
+.Xr pause 3 ,
+.Xr pthread_sigmask 3 ,
+.Xr siginfo 3
+.Sh STANDARDS
+The
+.Fn sigqueue
+system call conforms to
+.St -p1003.1-2004
+.Sh HISTORY
+Support for
+.Tn POSIX
+realtime signal queue first appeared in
+.Fx 7.0 .
diff --git a/lib/libc/sys/sigreturn.2 b/lib/libc/sys/sigreturn.2
new file mode 100644
index 0000000..02d75a8
--- /dev/null
+++ b/lib/libc/sys/sigreturn.2
@@ -0,0 +1,93 @@
+.\" Copyright (c) 1985, 1991, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"     @(#)sigreturn.2	8.1 (Berkeley) 6/4/93
+.\" $FreeBSD$
+.\"
+.Dd June 4, 1993
+.Dt SIGRETURN 2
+.Os
+.Sh NAME
+.Nm sigreturn
+.Nd return from signal
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In signal.h
+.Ft int
+.Fn sigreturn "const ucontext_t *scp"
+.Sh DESCRIPTION
+The
+.Fn sigreturn
+system call
+allows users to atomically unmask, switch stacks,
+and return from a signal context.
+The processes signal mask and stack status are
+restored from the context structure pointed to by
+.Fa scp .
+The system call does not return;
+the users stack pointer, frame pointer, argument pointer,
+and processor status longword are restored from the context.
+Execution resumes at the specified pc.
+This system call is used by the trampoline code and
+.Xr longjmp 3
+when returning from a signal to the previously executing program.
+.Sh NOTES
+This system call is not available in
+.Bx 4.2
+hence it should not be used if backward compatibility is needed.
+.Sh RETURN VALUES
+If successful, the system call does not return.
+Otherwise, a value of -1 is returned and
+.Va errno
+is set to indicate the error.
+.Sh ERRORS
+The
+.Fn sigreturn
+system call
+will fail and the process context will remain unchanged
+if one of the following occurs.
+.Bl -tag -width Er
+.It Bq Er EFAULT
+The
+.Fa scp
+argument
+points to memory that is not a valid part of the process
+address space.
+.It Bq Er EINVAL
+The process status longword is invalid or would improperly
+raise the privilege level of the process.
+.El
+.Sh SEE ALSO
+.Xr sigaction 2 ,
+.Xr setjmp 3 ,
+.Xr ucontext 3
+.Sh HISTORY
+The
+.Fn sigreturn
+system call appeared in
+.Bx 4.3 .
diff --git a/lib/libc/sys/sigstack.2 b/lib/libc/sys/sigstack.2
new file mode 100644
index 0000000..efd7ed7
--- /dev/null
+++ b/lib/libc/sys/sigstack.2
@@ -0,0 +1,50 @@
+.\" Copyright (c) 1983, 1992, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"     @(#)sigstack.2	8.1 (Berkeley) 6/4/93
+.\" $FreeBSD$
+.\"
+.Dd June 4, 1993
+.Dt SIGSTACK 2
+.Os
+.Sh NAME
+.Nm sigstack
+.Nd set and/or get signal stack context
+.Sh LIBRARY
+.Lb libc
+.Sh DESCRIPTION
+The
+.Fn sigstack
+function has been deprecated in favor of the interface described in
+.Xr sigaltstack 2 .
+.Sh SEE ALSO
+.Xr sigaltstack 2
+.Sh HISTORY
+The
+.Fn sigstack
+system call appeared in
+.Bx 4.2 .
diff --git a/lib/libc/sys/sigsuspend.2 b/lib/libc/sys/sigsuspend.2
new file mode 100644
index 0000000..3a67b53
--- /dev/null
+++ b/lib/libc/sys/sigsuspend.2
@@ -0,0 +1,81 @@
+.\" Copyright (c) 1983, 1991, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"	@(#)sigsuspend.2	8.2 (Berkeley) 5/16/95
+.\" $FreeBSD$
+.\"
+.Dd May 16, 1995
+.Dt SIGSUSPEND 2
+.Os
+.Sh NAME
+.Nm sigsuspend
+.Nd atomically release blocked signals and wait for interrupt
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In signal.h
+.Ft int
+.Fn sigsuspend "const sigset_t *sigmask"
+.Sh DESCRIPTION
+The
+.Fn sigsuspend
+system call
+temporarily changes the blocked signal mask to the set to which
+.Fa sigmask
+points,
+and then waits for a signal to arrive;
+on return the previous set of masked signals is restored.
+The signal mask set
+is usually empty to indicate that all
+signals are to be unblocked for the duration of the call.
+.Pp
+In normal usage, a signal is blocked using
+.Xr sigprocmask 2
+to begin a critical section, variables modified on the occurrence
+of the signal are examined to determine that there is no work
+to be done, and the process pauses awaiting work by using
+.Fn sigsuspend
+with the previous mask returned by
+.Xr sigprocmask 2 .
+.Sh RETURN VALUES
+The
+.Fn sigsuspend
+system call
+always terminates by being interrupted, returning -1 with
+.Va errno
+set to
+.Er EINTR .
+.Sh SEE ALSO
+.Xr sigaction 2 ,
+.Xr sigpending 2 ,
+.Xr sigprocmask 2 ,
+.Xr sigsetops 3
+.Sh STANDARDS
+The
+.Fn sigsuspend
+system call is expected to conform to
+.St -p1003.1-90 .
diff --git a/lib/libc/sys/sigwait.2 b/lib/libc/sys/sigwait.2
new file mode 100644
index 0000000..8c00cf4
--- /dev/null
+++ b/lib/libc/sys/sigwait.2
@@ -0,0 +1,119 @@
+.\" Copyright (C) 2000 Jason Evans <jasone@FreeBSD.org>.
+.\" All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice(s), this list of conditions and the following disclaimer as
+.\"    the first lines of this file unmodified other than the possible
+.\"    addition of one or more copyright notices.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice(s), this list of conditions and the following disclaimer in
+.\"    the documentation and/or other materials provided with the
+.\"    distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) ``AS IS'' AND ANY
+.\" EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+.\" PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) BE
+.\" LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
+.\" BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+.\" WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
+.\" OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
+.\" EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd November 11, 2005
+.Dt SIGWAIT 2
+.Os
+.Sh NAME
+.Nm sigwait
+.Nd select a set of signals
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In signal.h
+.Ft int
+.Fn sigwait "const sigset_t * restrict set" "int * restrict sig"
+.Sh DESCRIPTION
+The
+.Fn sigwait
+system call selects a set of signals, specified by
+.Fa set .
+If none of the selected signals are pending,
+.Fn sigwait
+waits until one or more of the selected signals has been generated.
+Then
+.Fn sigwait
+atomically clears one of the selected signals from the set of pending signals
+for the process and sets the location pointed to by
+.Fa sig
+to the signal number that was cleared.
+.Pp
+The signals specified by
+.Fa set
+should be blocked at the time of the call to
+.Fn sigwait .
+.Pp
+If more than one thread is using
+.Fn sigwait
+to wait for the same signal, no more than one of these threads will return from
+.Fn sigwait
+with the signal number.
+If more than a single thread is blocked in
+.Fn sigwait
+for a signal when that signal is generated for the process, it is unspecified
+which of the waiting threads returns from
+.Fn sigwait .
+If the signal is generated for a specific thread, as by
+.Fn pthread_kill ,
+only that thread will return.
+.Pp
+Should any of the multiple pending signals in the range
+.Dv SIGRTMIN
+to
+.Dv SIGRTMAX
+be
+selected, it will be the lowest numbered one.
+The selection order between realtime
+and non-realtime signals, or between multiple pending non-realtime signals,
+is unspecified.
+.Sh RETURN VALUES
+If successful,
+.Fn sigwait
+returns 0 and sets the location pointed to by
+.Fa sig
+to the cleared signal number.
+Otherwise, an error number is returned.
+.Sh ERRORS
+The
+.Fn sigwait
+system call will fail if:
+.Bl -tag -width Er
+.It Bq Er EINVAL
+The
+.Fa set
+argument
+specifies one or more invalid signal numbers.
+.It Bq Er EFAULT
+Any arguments point outside the allocated address space or there is a
+memory protection fault.
+.El
+.Sh SEE ALSO
+.Xr sigaction 2 ,
+.Xr sigpending 2 ,
+.Xr sigqueue 2 ,
+.Xr sigsuspend 2 ,
+.Xr sigtimedwait 2 ,
+.Xr sigwaitinfo 2 ,
+.Xr pause 3 ,
+.Xr pthread_sigmask 3
+.Sh STANDARDS
+The
+.Fn sigwait
+function conforms to
+.St -p1003.1-96 .
diff --git a/lib/libc/sys/sigwait.c b/lib/libc/sys/sigwait.c
new file mode 100644
index 0000000..2fdffdd
--- /dev/null
+++ b/lib/libc/sys/sigwait.c
@@ -0,0 +1,46 @@
+/*-
+ * Copyright (c) 2010 davidxu@freebsd.org
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <errno.h>
+#include <signal.h>
+
+int __sys_sigwait(const sigset_t * restrict, int * restrict);
+
+__weak_reference(__sigwait, sigwait);
+
+int
+__sigwait(const sigset_t * restrict set, int * restrict sig)
+{
+	int ret;
+
+	/* POSIX does not allow EINTR to be returned */
+	do  {
+		ret = __sys_sigwait(set, sig);
+	} while (ret == EINTR);
+	return (ret);
+}
diff --git a/lib/libc/sys/sigwaitinfo.2 b/lib/libc/sys/sigwaitinfo.2
new file mode 100644
index 0000000..41be9e2
--- /dev/null
+++ b/lib/libc/sys/sigwaitinfo.2
@@ -0,0 +1,199 @@
+.\" Copyright (c) 2005 David Xu <davidxu@FreeBSD.org>
+.\" All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice(s), this list of conditions and the following disclaimer as
+.\"    the first lines of this file unmodified other than the possible
+.\"    addition of one or more copyright notices.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice(s), this list of conditions and the following disclaimer in
+.\"    the documentation and/or other materials provided with the
+.\"    distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) ``AS IS'' AND ANY
+.\" EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+.\" PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) BE
+.\" LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
+.\" BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+.\" WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
+.\" OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
+.\" EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd November 11, 2005
+.Dt SIGTIMEDWAIT 2
+.Os
+.Sh NAME
+.Nm sigtimedwait , sigwaitinfo
+.Nd "wait for queued signals (REALTIME)"
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In signal.h
+.Ft int
+.Fo sigtimedwait
+.Fa "const sigset_t *restrict set" "siginfo_t *restrict info"
+.Fa "const struct timespec *restrict timeout"
+.Fc
+.Ft int
+.Fn sigwaitinfo "const sigset_t * restrict set" "siginfo_t * restrict info"
+.Sh DESCRIPTION
+The
+.Fn sigtimedwait
+system call is equivalent to
+.Fn sigwaitinfo
+except that if none of the signals specified by
+.Fa set
+are pending,
+.Fn sigtimedwait
+waits for the time interval specified in the
+.Vt timespec
+structure referenced by
+.Fa timeout .
+If the
+.Vt timespec
+structure pointed to by
+.Fa timeout
+is zero-valued and if none of the signals specified by
+.Fa set
+are pending, then
+.Fn sigtimedwait
+returns immediately with an error.
+If
+.Fa timeout
+is the
+.Dv NULL
+pointer, the behavior is unspecified.
+.Dv CLOCK_MONOTONIC
+clock is used to measure the time interval specified by the
+.Fa timeout
+argument.
+.Pp
+The
+.Fn sigwaitinfo
+system call selects the pending signal from the set specified by
+.Fa set .
+Should any of multiple pending signals in the range
+.Dv SIGRTMIN
+to
+.Dv SIGRTMAX
+be selected, it shall be the lowest numbered one.
+The
+selection order between realtime and non-realtime signals, or
+between multiple pending non-realtime signals, is unspecified.
+If no signal in
+.Fa set
+is pending at the time of the call, the calling thread
+is suspended until one or more signals in
+.Fa set
+become pending or until it is interrupted by an unblocked, caught signal.
+.Pp
+The
+.Fn sigwaitinfo
+system call is equivalent to the
+.Fn sigwait
+system call if the
+.Fa info
+argument is
+.Dv NULL .
+If the
+.Fa info
+argument is
+.Pf non- Dv NULL ,
+the
+.Fn sigwaitinfo
+function is equivalent to
+.Fn sigwait ,
+except that the selected signal number shall be stored in the
+.Va si_signo
+member, and the cause of the signal shall be stored in the
+.Va si_code
+member.
+If any value is queued to the selected signal, the first such queued
+value is dequeued and, if the info argument is
+.Pf non- Dv NULL ,
+the value is stored in the
+.Va si_value
+member of
+.Fa info .
+The system resource used to queue the signal
+is released and returned to the system for other use.
+If no value is queued,
+the content of the
+.Va si_value
+member is zero-valued.
+If no further signals are
+queued for the selected signal, the pending indication for that signal
+is reset.
+.Sh RETURN VALUES
+Upon successful completion (that is, one of the signals specified by
+.Fa set
+is pending or is generated)
+.Fn sigwaitinfo
+and
+.Fn sigtimedwait
+return the selected signal number.
+Otherwise, the functions return a value of \-1
+and set the global variable
+.Va errno
+to indicate the error.
+.Sh ERRORS
+The
+.Fn sigtimedwait
+system call
+will fail if:
+.Bl -tag -width Er
+.It Bq Er EAGAIN
+No signal specified by set was generated within the specified timeout period.
+.El
+.Pp
+The
+.Fn sigtimedwait
+and
+.Fn sigwaitinfo
+system calls fail if:
+.Bl -tag -width Er
+.It Bq Er EINTR
+The wait was interrupted by an unblocked, caught signal.
+.It Bq Er EFAULT
+Any arguments point outside the allocated address space or there is a
+memory protection fault.
+.Pp
+.El
+The
+.Fn sigtimedwait
+system call may also fail if:
+.Bl -tag -width Er
+.It Bq Er EINVAL
+The
+.Fa timeout
+argument specified a
+.Va tv_nsec
+value less than zero or greater than or equal
+to 1000 million.
+Kernel only checks for this error if no signal is pending in set and it
+is necessary to wait.
+.El
+.Sh SEE ALSO
+.Xr sigaction 2 ,
+.Xr sigpending 2 ,
+.Xr sigqueue 2 ,
+.Xr sigsuspend 2 ,
+.Xr sigwait 2 ,
+.Xr pause 3 ,
+.Xr pthread_sigmask 3 ,
+.Xr siginfo 3
+.Sh STANDARDS
+The
+.Fn sigtimedwait
+and
+.Fn sigwaitinfo
+system calls conform to
+.St -p1003.1-96 .
diff --git a/lib/libc/sys/socket.2 b/lib/libc/sys/socket.2
new file mode 100644
index 0000000..dae33d0
--- /dev/null
+++ b/lib/libc/sys/socket.2
@@ -0,0 +1,300 @@
+.\" Copyright (c) 1983, 1991, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"     From: @(#)socket.2	8.1 (Berkeley) 6/4/93
+.\" $FreeBSD$
+.\"
+.Dd January 5, 2009
+.Dt SOCKET 2
+.Os
+.Sh NAME
+.Nm socket
+.Nd create an endpoint for communication
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In sys/types.h
+.In sys/socket.h
+.Ft int
+.Fn socket "int domain" "int type" "int protocol"
+.Sh DESCRIPTION
+The
+.Fn socket
+system call
+creates an endpoint for communication and returns a descriptor.
+.Pp
+The
+.Fa domain
+argument specifies a communications domain within which
+communication will take place; this selects the protocol family
+which should be used.
+These families are defined in the include file
+.In sys/socket.h .
+The currently understood formats are:
+.Pp
+.Bd -literal -offset indent -compact
+PF_LOCAL	Host-internal protocols, formerly called PF_UNIX,
+PF_UNIX		Host-internal protocols, deprecated, use PF_LOCAL,
+PF_INET		Internet version 4 protocols,
+PF_PUP		PUP protocols, like BSP,
+PF_APPLETALK	AppleTalk protocols,
+PF_ROUTE	Internal Routing protocol,
+PF_LINK		Link layer interface,
+PF_IPX		Novell Internet Packet eXchange protocol,
+PF_RTIP		Help Identify RTIP packets,
+PF_PIP		Help Identify PIP packets,
+PF_ISDN		Integrated Services Digital Network,
+PF_KEY		Internal key-management function,
+PF_INET6	Internet version 6 protocols,
+PF_NATM		Native ATM access,
+PF_ATM		ATM,
+PF_NETGRAPH	Netgraph sockets
+.Ed
+.Pp
+The socket has the indicated
+.Fa type ,
+which specifies the semantics of communication.
+Currently
+defined types are:
+.Pp
+.Bd -literal -offset indent -compact
+SOCK_STREAM	Stream socket,
+SOCK_DGRAM	Datagram socket,
+SOCK_RAW	Raw-protocol interface,
+SOCK_RDM	Reliably-delivered packet,
+SOCK_SEQPACKET	Sequenced packet stream
+.Ed
+.Pp
+A
+.Dv SOCK_STREAM
+type provides sequenced, reliable,
+two-way connection based byte streams.
+An out-of-band data transmission mechanism may be supported.
+A
+.Dv SOCK_DGRAM
+socket supports
+datagrams (connectionless, unreliable messages of
+a fixed (typically small) maximum length).
+A
+.Dv SOCK_SEQPACKET
+socket may provide a sequenced, reliable,
+two-way connection-based data transmission path for datagrams
+of fixed maximum length; a consumer may be required to read
+an entire packet with each read system call.
+This facility is protocol specific, and presently unimplemented.
+.Dv SOCK_RAW
+sockets provide access to internal network protocols and interfaces.
+The types
+.Dv SOCK_RAW ,
+which is available only to the super-user, and
+.Dv SOCK_RDM ,
+which is planned,
+but not yet implemented, are not described here.
+.Pp
+The
+.Fa protocol
+argument
+specifies a particular protocol to be used with the socket.
+Normally only a single protocol exists to support a particular
+socket type within a given protocol family.
+However, it is possible
+that many protocols may exist, in which case a particular protocol
+must be specified in this manner.
+The protocol number to use is
+particular to the
+.Dq "communication domain"
+in which communication
+is to take place; see
+.Xr protocols 5 .
+.Pp
+The
+.Fa protocol
+argument may be set to zero (0) to request the default
+implementation of a socket type for the protocol, if any.
+.Pp
+Sockets of type
+.Dv SOCK_STREAM
+are full-duplex byte streams, similar
+to pipes.
+A stream socket must be in a
+.Em connected
+state before any data may be sent or received
+on it.
+A connection to another socket is created with a
+.Xr connect 2
+system call.
+Once connected, data may be transferred using
+.Xr read 2
+and
+.Xr write 2
+calls or some variant of the
+.Xr send 2
+and
+.Xr recv 2
+functions.
+(Some protocol families, such as the Internet family,
+support the notion of an
+.Dq implied connect ,
+which permits data to be sent piggybacked onto a connect operation by
+using the
+.Xr sendto 2
+system call.)
+When a session has been completed a
+.Xr close 2
+may be performed.
+Out-of-band data may also be transmitted as described in
+.Xr send 2
+and received as described in
+.Xr recv 2 .
+.Pp
+The communications protocols used to implement a
+.Dv SOCK_STREAM
+ensure that data
+is not lost or duplicated.
+If a piece of data for which the
+peer protocol has buffer space cannot be successfully transmitted
+within a reasonable length of time, then
+the connection is considered broken and calls
+will indicate an error with
+-1 returns and with
+.Er ETIMEDOUT
+as the specific code
+in the global variable
+.Va errno .
+The protocols optionally keep sockets
+.Dq warm
+by forcing transmissions
+roughly every minute in the absence of other activity.
+An error is then indicated if no response can be
+elicited on an otherwise
+idle connection for an extended period (e.g.\& 5 minutes).
+By default, a
+.Dv SIGPIPE
+signal is raised if a process sends
+on a broken stream, but this behavior may be inhibited via
+.Xr setsockopt 2 .
+.Pp
+.Dv SOCK_SEQPACKET
+sockets employ the same system calls
+as
+.Dv SOCK_STREAM
+sockets.
+The only difference
+is that
+.Xr read 2
+calls will return only the amount of data requested,
+and any remaining in the arriving packet will be discarded.
+.Pp
+.Dv SOCK_DGRAM
+and
+.Dv SOCK_RAW
+sockets allow sending of datagrams to correspondents
+named in
+.Xr send 2
+calls.
+Datagrams are generally received with
+.Xr recvfrom 2 ,
+which returns the next datagram with its return address.
+.Pp
+An
+.Xr fcntl 2
+system call can be used to specify a process group to receive
+a
+.Dv SIGURG
+signal when the out-of-band data arrives.
+It may also enable non-blocking I/O
+and asynchronous notification of I/O events
+via
+.Dv SIGIO .
+.Pp
+The operation of sockets is controlled by socket level
+.Em options .
+These options are defined in the file
+.In sys/socket.h .
+The
+.Xr setsockopt 2
+and
+.Xr getsockopt 2
+system calls are used to set and get options, respectively.
+.Sh RETURN VALUES
+A -1 is returned if an error occurs, otherwise the return
+value is a descriptor referencing the socket.
+.Sh ERRORS
+The
+.Fn socket
+system call fails if:
+.Bl -tag -width Er
+.It Bq Er EPROTONOSUPPORT
+The protocol type or the specified protocol is not supported
+within this domain.
+.It Bq Er EMFILE
+The per-process descriptor table is full.
+.It Bq Er ENFILE
+The system file table is full.
+.It Bq Er EACCES
+Permission to create a socket of the specified type and/or protocol
+is denied.
+.It Bq Er ENOBUFS
+Insufficient buffer space is available.
+The socket cannot be created until sufficient resources are freed.
+.It Bq Er EPERM
+User has insufficient privileges to carry out the requested operation.
+.El
+.Sh SEE ALSO
+.Xr accept 2 ,
+.Xr bind 2 ,
+.Xr connect 2 ,
+.Xr getpeername 2 ,
+.Xr getsockname 2 ,
+.Xr getsockopt 2 ,
+.Xr ioctl 2 ,
+.Xr listen 2 ,
+.Xr read 2 ,
+.Xr recv 2 ,
+.Xr select 2 ,
+.Xr send 2 ,
+.Xr shutdown 2 ,
+.Xr socketpair 2 ,
+.Xr write 2 ,
+.Xr getprotoent 3 ,
+.Xr netgraph 4 ,
+.Xr protocols 5
+.Rs
+.%T "An Introductory 4.3 BSD Interprocess Communication Tutorial"
+.%B PS1
+.%N 7
+.Re
+.Rs
+.%T "BSD Interprocess Communication Tutorial"
+.%B PS1
+.%N 8
+.Re
+.Sh HISTORY
+The
+.Fn socket
+system call appeared in
+.Bx 4.2 .
diff --git a/lib/libc/sys/socketpair.2 b/lib/libc/sys/socketpair.2
new file mode 100644
index 0000000..c86db43
--- /dev/null
+++ b/lib/libc/sys/socketpair.2
@@ -0,0 +1,91 @@
+.\" Copyright (c) 1983, 1991, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"     @(#)socketpair.2	8.1 (Berkeley) 6/4/93
+.\" $FreeBSD$
+.\"
+.Dd June 4, 1993
+.Dt SOCKETPAIR 2
+.Os
+.Sh NAME
+.Nm socketpair
+.Nd create a pair of connected sockets
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In sys/types.h
+.In sys/socket.h
+.Ft int
+.Fn socketpair "int d" "int type" "int protocol" "int *sv"
+.Sh DESCRIPTION
+The
+.Fn socketpair
+system call creates an unnamed pair of connected sockets in
+the specified domain
+.Fa d ,
+of the specified
+.Fa type ,
+and using the optionally specified
+.Fa protocol .
+The descriptors used in referencing the new sockets
+are returned in
+.Fa sv Ns [0]
+and
+.Fa sv Ns [1] .
+The two sockets are indistinguishable.
+.Sh RETURN VALUES
+.Rv -std socketpair
+.Sh ERRORS
+The call succeeds unless:
+.Bl -tag -width Er
+.It Bq Er EMFILE
+Too many descriptors are in use by this process.
+.It Bq Er EAFNOSUPPORT
+The specified address family is not supported on this machine.
+.It Bq Er EPROTONOSUPPORT
+The specified protocol is not supported on this machine.
+.It Bq Er EOPNOTSUPP
+The specified protocol does not support creation of socket pairs.
+.It Bq Er EFAULT
+The address
+.Fa sv
+does not specify a valid part of the
+process address space.
+.El
+.Sh SEE ALSO
+.Xr pipe 2 ,
+.Xr read 2 ,
+.Xr write 2
+.Sh HISTORY
+The
+.Fn socketpair
+system call appeared in
+.Bx 4.2 .
+.Sh BUGS
+This call is currently implemented only for the
+.Ux
+domain.
diff --git a/lib/libc/sys/stack_protector.c b/lib/libc/sys/stack_protector.c
new file mode 100644
index 0000000..ed7d635
--- /dev/null
+++ b/lib/libc/sys/stack_protector.c
@@ -0,0 +1,120 @@
+/* $NetBSD: stack_protector.c,v 1.4 2006/11/22 17:23:25 christos Exp $	*/
+/* $OpenBSD: stack_protector.c,v 1.10 2006/03/31 05:34:44 deraadt Exp $	*/
+/*
+ * Copyright (c) 2002 Hiroaki Etoh, Federico G. Schwindt, and Miodrag Vallat.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT,
+ * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/param.h>
+#include <sys/sysctl.h>
+#include <sys/types.h>
+#include <errno.h>
+#include <link.h>
+#include <signal.h>
+#include <string.h>
+#include <syslog.h>
+#include <unistd.h>
+#include "libc_private.h"
+
+extern int __sysctl(int *name, u_int namelen, void *oldp, size_t *oldlenp,
+    void *newp, size_t newlen);
+
+long __stack_chk_guard[8] = {0, 0, 0, 0, 0, 0, 0, 0};
+static void __guard_setup(void) __attribute__((__constructor__, __used__));
+static void __fail(const char *);
+void __stack_chk_fail(void);
+void __chk_fail(void);
+
+/*LINTED used*/
+static void
+__guard_setup(void)
+{
+	int mib[2];
+	size_t len;
+	int error;
+
+	if (__stack_chk_guard[0] != 0)
+		return;
+	error = _elf_aux_info(AT_CANARY, __stack_chk_guard,
+	    sizeof(__stack_chk_guard));
+	if (error == 0 && __stack_chk_guard[0] != 0)
+		return;
+
+	mib[0] = CTL_KERN;
+	mib[1] = KERN_ARND;
+
+	len = sizeof(__stack_chk_guard);
+	if (__sysctl(mib, 2, __stack_chk_guard, &len, NULL, 0) == -1 ||
+	    len != sizeof(__stack_chk_guard)) {
+		/* If sysctl was unsuccessful, use the "terminator canary". */
+		((unsigned char *)(void *)__stack_chk_guard)[0] = 0;
+		((unsigned char *)(void *)__stack_chk_guard)[1] = 0;
+		((unsigned char *)(void *)__stack_chk_guard)[2] = '\n';
+		((unsigned char *)(void *)__stack_chk_guard)[3] = 255;
+	}
+}
+
+/*ARGSUSED*/
+static void
+__fail(const char *msg)
+{
+	struct sigaction sa;
+	sigset_t mask;
+
+	/* Immediately block all signal handlers from running code */
+	(void)sigfillset(&mask);
+	(void)sigdelset(&mask, SIGABRT);
+	(void)sigprocmask(SIG_BLOCK, &mask, NULL);
+
+	/* This may fail on a chroot jail... */
+	syslog(LOG_CRIT, "%s", msg);
+
+	(void)memset(&sa, 0, sizeof(sa));
+	(void)sigemptyset(&sa.sa_mask);
+	sa.sa_flags = 0;
+	sa.sa_handler = SIG_DFL;
+	(void)sigaction(SIGABRT, &sa, NULL);
+	(void)kill(getpid(), SIGABRT);
+	_exit(127);
+}
+
+void
+__stack_chk_fail(void)
+{
+	__fail("stack overflow detected; terminated");
+}
+
+void
+__chk_fail(void)
+{
+	__fail("buffer overflow detected; terminated");
+}
+
+#ifndef PIC
+__weak_reference(__stack_chk_fail, __stack_chk_fail_local);
+#endif
diff --git a/lib/libc/sys/stack_protector_compat.c b/lib/libc/sys/stack_protector_compat.c
new file mode 100644
index 0000000..cacb863
--- /dev/null
+++ b/lib/libc/sys/stack_protector_compat.c
@@ -0,0 +1,20 @@
+/*
+ * Written by Alexander Kabaev <kan@FreeBSD.org>
+ * The file is in public domain.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+void __stack_chk_fail(void);
+
+#ifdef PIC
+void
+__stack_chk_fail_local_hidden(void)
+{
+
+	__stack_chk_fail();
+}
+
+__sym_compat(__stack_chk_fail_local, __stack_chk_fail_local_hidden, FBSD_1.0);
+#endif
diff --git a/lib/libc/sys/stat.2 b/lib/libc/sys/stat.2
new file mode 100644
index 0000000..85f0cf0
--- /dev/null
+++ b/lib/libc/sys/stat.2
@@ -0,0 +1,437 @@
+.\" Copyright (c) 1980, 1991, 1993, 1994
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"     @(#)stat.2	8.4 (Berkeley) 5/1/95
+.\" $FreeBSD$
+.\"
+.Dd March 28, 2010
+.Dt STAT 2
+.Os
+.Sh NAME
+.Nm stat ,
+.Nm lstat ,
+.Nm fstat ,
+.Nm fstatat
+.Nd get file status
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In sys/types.h
+.In sys/stat.h
+.Ft int
+.Fn stat "const char *path" "struct stat *sb"
+.Ft int
+.Fn lstat "const char *path" "struct stat *sb"
+.Ft int
+.Fn fstat "int fd" "struct stat *sb"
+.Ft int
+.Fn fstatat "int fd" "const char *path" "struct stat *buf" "int flag"
+.Sh DESCRIPTION
+The
+.Fn stat
+system call obtains information about the file pointed to by
+.Fa path .
+Read, write or execute
+permission of the named file is not required, but all directories
+listed in the path name leading to the file must be searchable.
+.Pp
+The
+.Fn lstat
+system call is like
+.Fn stat
+except in the case where the named file is a symbolic link,
+in which case
+.Fn lstat
+returns information about the link,
+while
+.Fn stat
+returns information about the file the link references.
+.Pp
+The
+.Fn fstat
+system call obtains the same information about an open file
+known by the file descriptor
+.Fa fd .
+.Pp
+The
+.Fn fstatat
+system call is equivalent to
+.Fn stat
+and
+.Fn lstat
+except in the case where the
+.Fa path
+specifies a relative path.
+In this case the status is retrieved from a file relative to
+the directory associated with the file descriptor
+.Fa fd
+instead of the current working directory.
+.Pp
+The values for the
+.Fa flag
+are constructed by a bitwise-inclusive OR of flags from the following list,
+defined in
+.In fcntl.h :
+.Bl -tag -width indent
+.It Dv AT_SYMLINK_NOFOLLOW
+If
+.Fa path
+names a symbolic link, the status of the symbolic link is returned.
+.El
+.Pp
+If
+.Fn fstatat
+is passed the special value
+.Dv AT_FDCWD
+in the
+.Fa fd
+parameter, the current working directory is used and the behavior is
+identical to a call to
+.Fn stat
+or
+.Fn lstat
+respectively, depending on whether or not the
+.Dv AT_SYMLINK_NOFOLLOW
+bit is set in
+.Fa flag .
+.Pp
+The
+.Fa sb
+argument is a pointer to a
+.Vt stat
+structure
+as defined by
+.In sys/stat.h
+and into which information is placed concerning the file.
+.Pp
+The fields of
+.Vt "struct stat"
+related to the file system are as follows:
+.Bl -tag -width ".Va st_nlink"
+.It Va st_dev
+The numeric ID of the device containing the file.
+.It Va st_ino
+The file's inode number.
+.It Va st_nlink
+The number of hard links to the file.
+.El
+.Pp
+The
+.Va st_dev
+and
+.Va st_ino
+fields together identify the file uniquely within the system.
+.Pp
+The time-related fields of
+.Vt "struct stat"
+are as follows:
+.Bl -tag -width ".Va st_birthtim"
+.It Va st_atim
+Time when file data last accessed.
+Changed by the
+.Xr mknod 2 ,
+.Xr utimes 2 ,
+.Xr read 2
+and
+.Xr readv 2
+system calls.
+.It Va st_mtim
+Time when file data last modified.
+Changed by the
+.Xr mkdir 2 ,
+.Xr mkfifo 2 ,
+.Xr mknod 2 ,
+.Xr utimes 2 ,
+.Xr write 2
+and
+.Xr writev 2
+system calls.
+.It Va st_ctim
+Time when file status was last changed (inode data modification).
+Changed by the
+.Xr chflags 2 ,
+.Xr chmod 2 ,
+.Xr chown 2 ,
+.Xr creat 2 ,
+.Xr link 2 ,
+.Xr mkdir 2 ,
+.Xr mkfifo 2 ,
+.Xr mknod 2 ,
+.Xr rename 2 ,
+.Xr rmdir 2 ,
+.Xr symlink 2 ,
+.Xr truncate 2 ,
+.Xr unlink 2 ,
+.Xr utimes 2 ,
+.Xr write 2
+and
+.Xr writev 2
+system calls.
+.It Va st_birthtim
+Time when the inode was created.
+.El
+.Pp
+The following time-related macros are defined for compatibility:
+.Bd -literal
+#define	st_atime		st_atim.tv_sec
+#define	st_mtime		st_mtim.tv_sec
+#define	st_ctime		st_ctim.tv_sec
+#ifndef _POSIX_SOURCE
+#define	st_birthtime		st_birthtim.tv_sec
+#endif
+
+#ifndef _POSIX_SOURCE
+#define	st_atimespec		st_atim
+#define	st_mtimespec		st_mtim
+#define	st_ctimespec		st_ctim
+#define	st_birthtimespec	st_birthtim
+#endif
+.Ed
+.Pp
+The size-related fields of the
+.Vt "struct stat"
+are as follows:
+.Bl -tag -width ".Va st_blksize"
+.It Va st_size
+The file size in bytes.
+.It Va st_blksize
+The optimal I/O block size for the file.
+.It Va st_blocks
+The actual number of blocks allocated for the file in 512-byte units.
+As short symbolic links are stored in the inode, this number may
+be zero.
+.El
+.Pp
+The access-related fields of
+.Vt "struct stat"
+are as follows:
+.Bl -tag -width ".Va st_mode"
+.It Va st_uid
+The user ID of the file's owner.
+.It Va st_gid
+The group ID of the file.
+.It Va st_mode
+Status of the file (see below).
+.El
+.Pp
+The status information word
+.Fa st_mode
+has the following bits:
+.Bd -literal
+#define S_IFMT   0170000  /* type of file mask */
+#define S_IFIFO  0010000  /* named pipe (fifo) */
+#define S_IFCHR  0020000  /* character special */
+#define S_IFDIR  0040000  /* directory */
+#define S_IFBLK  0060000  /* block special */
+#define S_IFREG  0100000  /* regular */
+#define S_IFLNK  0120000  /* symbolic link */
+#define S_IFSOCK 0140000  /* socket */
+#define S_IFWHT  0160000  /* whiteout */
+#define S_ISUID  0004000  /* set user id on execution */
+#define S_ISGID  0002000  /* set group id on execution */
+#define S_ISVTX  0001000  /* save swapped text even after use */
+#define S_IRWXU  0000700  /* RWX mask for owner */
+#define S_IRUSR  0000400  /* read permission, owner */
+#define S_IWUSR  0000200  /* write permission, owner */
+#define S_IXUSR  0000100  /* execute/search permission, owner */
+#define S_IRWXG  0000070  /* RWX mask for group */
+#define S_IRGRP  0000040  /* read permission, group */
+#define S_IWGRP  0000020  /* write permission, group */
+#define S_IXGRP  0000010  /* execute/search permission, group */
+#define S_IRWXO  0000007  /* RWX mask for other */
+#define S_IROTH  0000004  /* read permission, other */
+#define S_IWOTH  0000002  /* write permission, other */
+#define S_IXOTH  0000001  /* execute/search permission, other */
+.Ed
+.Pp
+For a list of access modes, see
+.In sys/stat.h ,
+.Xr access 2
+and
+.Xr chmod 2 .
+The following macros are available to test whether a
+.Va st_mode
+value passed in the
+.Fa m
+argument corresponds to a file of the specified type:
+.Bl -tag -width ".Fn S_ISFIFO m"
+.It Fn S_ISBLK m
+Test for a block special file.
+.It Fn S_ISCHR m
+Test for a character special file.
+.It Fn S_ISDIR m
+Test for a directory.
+.It Fn S_ISFIFO m
+Test for a pipe or FIFO special file.
+.It Fn S_ISLNK m
+Test for a symbolic link.
+.It Fn S_ISREG m
+Test for a regular file.
+.It Fn S_ISSOCK m
+Test for a socket.
+.It Fn S_ISWHT m
+Test for a whiteout.
+.El
+.Pp
+The macros evaluate to a non-zero value if the test is true
+or to the value 0 if the test is false.
+.Sh RETURN VALUES
+.Rv -std
+.Sh COMPATIBILITY
+Previous versions of the system used different types for the
+.Va st_dev ,
+.Va st_uid ,
+.Va st_gid ,
+.Va st_rdev ,
+.Va st_size ,
+.Va st_blksize
+and
+.Va st_blocks
+fields.
+.Sh ERRORS
+The
+.Fn stat
+and
+.Fn lstat
+system calls will fail if:
+.Bl -tag -width Er
+.It Bq Er EACCES
+Search permission is denied for a component of the path prefix.
+.It Bq Er EFAULT
+The
+.Fa sb
+or
+.Fa path
+argument
+points to an invalid address.
+.It Bq Er EIO
+An I/O error occurred while reading from or writing to the file system.
+.It Bq Er ELOOP
+Too many symbolic links were encountered in translating the pathname.
+.It Bq Er ENAMETOOLONG
+A component of a pathname exceeded 255 characters,
+or an entire path name exceeded 1023 characters.
+.It Bq Er ENOENT
+The named file does not exist.
+.It Bq Er ENOTDIR
+A component of the path prefix is not a directory.
+.It Bq Er EOVERFLOW
+The file size in bytes cannot be
+represented correctly in the structure pointed to by
+.Fa sb .
+.El
+.Pp
+.Bl -tag -width Er
+The
+.Fn fstat
+system call will fail if:
+.It Bq Er EBADF
+The
+.Fa fd
+argument
+is not a valid open file descriptor.
+.It Bq Er EFAULT
+The
+.Fa sb
+argument
+points to an invalid address.
+.It Bq Er EIO
+An I/O error occurred while reading from or writing to the file system.
+.It Bq Er EOVERFLOW
+The file size in bytes cannot be
+represented correctly in the structure pointed to by
+.Fa sb .
+.El
+.Pp
+In addition to the errors returned by the
+.Fn lstat ,
+the
+.Fn fstatat
+may fail if:
+.Bl -tag -width Er
+.It Bq Er EBADF
+The
+.Fa path
+argument does not specify an absolute path and the
+.Fa fd
+argument is neither
+.Dv AT_FDCWD
+nor a valid file descriptor open for searching.
+.It Bq Er EINVAL
+The value of the
+.Fa flag
+argument is not valid.
+.It Bq Er ENOTDIR
+The
+.Fa path
+argument is not an absolute path and
+.Fa fd
+is neither
+.Dv AT_FDCWD
+nor a file descriptor associated with a directory.
+.El
+.Sh SEE ALSO
+.Xr access 2 ,
+.Xr chmod 2 ,
+.Xr chown 2 ,
+.Xr fhstat 2 ,
+.Xr statfs 2 ,
+.Xr utimes 2 ,
+.Xr symlink 7 ,
+.Xr sticky 8
+.Sh STANDARDS
+The
+.Fn stat
+and
+.Fn fstat
+system calls are expected to conform to
+.St -p1003.1-90 .
+The
+.Fn fchownat
+system call follows The Open Group Extended API Set 2 specification.
+.Sh HISTORY
+The
+.Fn stat
+and
+.Fn fstat
+system calls appeared in
+.At v7 .
+The
+.Fn lstat
+system call appeared in
+.Bx 4.2 .
+The
+.Fn fstatat
+system call appeared in
+.Fx 8.0 .
+.Sh BUGS
+Applying
+.Fn fstat
+to a socket (and thus to a pipe)
+returns a zeroed buffer,
+except for the blocksize field,
+and a unique device and inode number.
diff --git a/lib/libc/sys/statfs.2 b/lib/libc/sys/statfs.2
new file mode 100644
index 0000000..888f976
--- /dev/null
+++ b/lib/libc/sys/statfs.2
@@ -0,0 +1,235 @@
+.\" Copyright (c) 1989, 1991, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"	@(#)statfs.2	8.5 (Berkeley) 5/24/95
+.\" $FreeBSD$
+.\"
+.Dd November 1, 2006
+.Dt STATFS 2
+.Os
+.Sh NAME
+.Nm statfs
+.Nd get file system statistics
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In sys/param.h
+.In sys/mount.h
+.Ft int
+.Fn statfs "const char *path" "struct statfs *buf"
+.Ft int
+.Fn fstatfs "int fd" "struct statfs *buf"
+.Sh DESCRIPTION
+The
+.Fn statfs
+system call
+returns information about a mounted file system.
+The
+.Fa path
+argument
+is the path name of any file within the mounted file system.
+The
+.Fa buf
+argument
+is a pointer to a
+.Vt statfs
+structure defined as follows:
+.Bd -literal
+typedef struct fsid { int32_t val[2]; } fsid_t; /* file system id type */
+
+/*
+ * filesystem statistics
+ */
+
+#define	MFSNAMELEN	16		/* length of type name including null */
+#define	MNAMELEN	88		/* size of on/from name bufs */
+#define	STATFS_VERSION	0x20030518	/* current version number */
+
+struct statfs {
+uint32_t f_version;		/* structure version number */
+uint32_t f_type;		/* type of filesystem */
+uint64_t f_flags;		/* copy of mount exported flags */
+uint64_t f_bsize;		/* filesystem fragment size */
+uint64_t f_iosize;		/* optimal transfer block size */
+uint64_t f_blocks;		/* total data blocks in filesystem */
+uint64_t f_bfree;		/* free blocks in filesystem */
+int64_t	 f_bavail;		/* free blocks avail to non-superuser */
+uint64_t f_files;		/* total file nodes in filesystem */
+int64_t	 f_ffree;		/* free nodes avail to non-superuser */
+uint64_t f_syncwrites;		/* count of sync writes since mount */
+uint64_t f_asyncwrites;		/* count of async writes since mount */
+uint64_t f_syncreads;		/* count of sync reads since mount */
+uint64_t f_asyncreads;		/* count of async reads since mount */
+uint64_t f_spare[10];		/* unused spare */
+uint32_t f_namemax;		/* maximum filename length */
+uid_t	  f_owner;		/* user that mounted the filesystem */
+fsid_t	  f_fsid;		/* filesystem id */
+char	  f_charspare[80];	    /* spare string space */
+char	  f_fstypename[MFSNAMELEN]; /* filesystem type name */
+char	  f_mntfromname[MNAMELEN];  /* mounted filesystem */
+char	  f_mntonname[MNAMELEN];    /* directory on which mounted */
+};
+.Ed
+.Pp
+The flags that may be returned include:
+.Bl -tag -width MNT_SYNCHRONOUS
+.It Dv MNT_RDONLY
+The file system is mounted read-only;
+Even the super-user may not write on it.
+.It Dv MNT_NOEXEC
+Files may not be executed from the file system.
+.It Dv MNT_NOSUID
+Setuid and setgid bits on files are not honored when they are executed.
+.It Dv MNT_SYNCHRONOUS
+All I/O to the file system is done synchronously.
+.It Dv MNT_ASYNC
+No file system I/O is done synchronously.
+.It Dv MNT_SOFTDEP
+Soft updates being done (see
+.Xr ffs 7 ) .
+.It Dv MNT_GJOURNAL
+Journaling with gjournal is enabled (see
+.Xr gjournal 8 ) .
+.It Dv MNT_SUIDDIR
+Special handling of SUID bit on directories.
+.It Dv MNT_UNION
+Union with underlying file system.
+.It Dv MNT_NOSYMFOLLOW
+Symbolic links are not followed.
+.It Dv MNT_NOCLUSTERR
+Read clustering is disabled.
+.It Dv MNT_NOCLUSTERW
+Write clustering is disabled.
+.\".It Dv MNT_JAILDEVFS
+.\"XXX
+.It Dv MNT_MULTILABEL
+Mandatory Access Control (MAC) support for individual objects
+(see
+.Xr mac 4 ) .
+.It Dv MNT_ACLS
+Access Control List (ACL) support enabled.
+.It Dv MNT_LOCAL
+The file system resides locally.
+.It Dv MNT_QUOTA
+The file system has quotas enabled on it.
+.It Dv MNT_ROOTFS
+Identifies the root file system.
+.It Dv MNT_EXRDONLY
+The file system is exported read-only.
+.It Dv MNT_NOATIME
+Updating of file access times is disabled.
+.It Dv MNT_USER
+The file system has been mounted by a user.
+.\".It Dv MNT_IGNORE
+.\"XXX
+.It Dv MNT_EXPORTED
+The file system is exported for both reading and writing.
+.It Dv MNT_DEFEXPORTED
+The file system is exported for both reading and writing to any Internet host.
+.It Dv MNT_EXPORTANON
+The file system maps all remote accesses to the anonymous user.
+.It Dv MNT_EXKERB
+The file system is exported with Kerberos uid mapping.
+.It Dv MNT_EXPUBLIC
+The file system is exported publicly (WebNFS).
+.El
+.Pp
+Fields that are undefined for a particular file system are set to -1.
+The
+.Fn fstatfs
+system call
+returns the same information about an open file referenced by descriptor
+.Fa fd .
+.Sh RETURN VALUES
+.Rv -std
+.Sh ERRORS
+The
+.Fn statfs
+system call
+fails if one or more of the following are true:
+.Bl -tag -width Er
+.It Bq Er ENOTDIR
+A component of the path prefix of
+.Fa path
+is not a directory.
+.It Bq Er ENAMETOOLONG
+The length of a component of
+.Fa path
+exceeds 255 characters,
+or the length of
+.Fa path
+exceeds 1023 characters.
+.It Bq Er ENOENT
+The file referred to by
+.Fa path
+does not exist.
+.It Bq Er EACCES
+Search permission is denied for a component of the path prefix of
+.Fa path .
+.It Bq Er ELOOP
+Too many symbolic links were encountered in translating
+.Fa path .
+.It Bq Er EFAULT
+The
+.Fa buf
+or
+.Fa path
+argument
+points to an invalid address.
+.It Bq Er EIO
+An
+.Tn I/O
+error occurred while reading from or writing to the file system.
+.El
+.Pp
+The
+.Fn fstatfs
+system call
+fails if one or more of the following are true:
+.Bl -tag -width Er
+.It Bq Er EBADF
+The
+.Fa fd
+argument
+is not a valid open file descriptor.
+.It Bq Er EFAULT
+The
+.Fa buf
+argument
+points to an invalid address.
+.It Bq Er EIO
+An
+.Tn I/O
+error occurred while reading from or writing to the file system.
+.El
+.Sh SEE ALSO
+.Xr fhstatfs 2
+.Sh HISTORY
+The
+.Fn statfs
+system call first appeared in
+.Bx 4.4 .
diff --git a/lib/libc/sys/swapon.2 b/lib/libc/sys/swapon.2
new file mode 100644
index 0000000..b3e4474
--- /dev/null
+++ b/lib/libc/sys/swapon.2
@@ -0,0 +1,147 @@
+.\" Copyright (c) 1980, 1991, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"     @(#)swapon.2	8.1 (Berkeley) 6/4/93
+.\" $FreeBSD$
+.\"
+.Dd June 4, 1993
+.Dt SWAPON 2
+.Os
+.Sh NAME
+.Nm swapon , swapoff
+.Nd control devices for interleaved paging/swapping
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In unistd.h
+.Ft int
+.Fn swapon "const char *special"
+.Ft int
+.Fn swapoff "const char *special"
+.Sh DESCRIPTION
+The
+.Fn swapon
+system call
+makes the block device
+.Fa special
+available to the system for
+allocation for paging and swapping.
+The names of potentially
+available devices are known to the system and defined at system
+configuration time.
+The size of the swap area on
+.Fa special
+is calculated at the time the device is first made available
+for swapping.
+.Pp
+The
+.Fn swapoff
+system call disables paging and swapping on the given device.
+All associated swap metadata are deallocated, and the device
+is made available for other purposes.
+.Sh RETURN VALUES
+If an error has occurred, a value of -1 is returned and
+.Va errno
+is set to indicate the error.
+.Sh ERRORS
+Both
+.Fn swapon
+and
+.Fn swapoff
+can fail if:
+.Bl -tag -width Er
+.It Bq Er ENOTDIR
+A component of the path prefix is not a directory.
+.It Bq Er ENAMETOOLONG
+A component of a pathname exceeded 255 characters,
+or an entire path name exceeded 1023 characters.
+.It Bq Er ENOENT
+The named device does not exist.
+.It Bq Er EACCES
+Search permission is denied for a component of the path prefix.
+.It Bq Er ELOOP
+Too many symbolic links were encountered in translating the pathname.
+.It Bq Er EPERM
+The caller is not the super-user.
+.It Bq Er EFAULT
+The
+.Fa special
+argument
+points outside the process's allocated address space.
+.El
+.Pp
+Additionally,
+.Fn swapon
+can fail for the following reasons:
+.Bl -tag -width Er
+.It Bq Er EINVAL
+The system has reached the boot-time limit on the number of
+swap devices,
+.Va vm.nswapdev .
+.It Bq Er ENOTBLK
+The
+.Fa special
+argument
+is not a block device.
+.It Bq Er EBUSY
+The device specified by
+.Fa special
+has already
+been made available for swapping
+.It Bq Er ENXIO
+The major device number of
+.Fa special
+is out of range (this indicates no device driver exists
+for the associated hardware).
+.It Bq Er EIO
+An I/O error occurred while opening the swap device.
+.El
+.Pp
+Lastly,
+.Fn swapoff
+can fail if:
+.Bl -tag -width Er
+.It Bq Er EINVAL
+The system is not currently swapping to
+.Fa special .
+.It Bq Er ENOMEM
+Not enough virtual memory is available to safely disable
+paging and swapping to the given device.
+.El
+.Sh SEE ALSO
+.Xr config 8 ,
+.Xr swapon 8 ,
+.Xr sysctl 8
+.Sh HISTORY
+The
+.Fn swapon
+system call appeared in
+.Bx 4.0 .
+The
+.Fn swapoff
+system call appeared in
+.Fx 5.0 .
diff --git a/lib/libc/sys/symlink.2 b/lib/libc/sys/symlink.2
new file mode 100644
index 0000000..bfe2ede
--- /dev/null
+++ b/lib/libc/sys/symlink.2
@@ -0,0 +1,206 @@
+.\" Copyright (c) 1983, 1991, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"     @(#)symlink.2	8.1 (Berkeley) 6/4/93
+.\" $FreeBSD$
+.\"
+.Dd April 10, 2008
+.Dt SYMLINK 2
+.Os
+.Sh NAME
+.Nm symlink ,
+.Nm symlinkat
+.Nd make symbolic link to a file
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In unistd.h
+.Ft int
+.Fn symlink "const char *name1" "const char *name2"
+.Ft int
+.Fn symlinkat "const char *name1" "int fd" "const char *name2"
+.Sh DESCRIPTION
+A symbolic link
+.Fa name2
+is created to
+.Fa name1
+.Fa ( name2
+is the name of the
+file created,
+.Fa name1
+is the string
+used in creating the symbolic link).
+Either name may be an arbitrary path name; the files need not
+be on the same file system.
+.Pp
+The
+.Fn symlinkat
+system call is equivalent to
+.Fn symlink
+except in the case where
+.Fa name2
+specifies a relative path.
+In this case the symbolic link is created relative to the directory
+associated with the file descriptor
+.Fa fd
+instead of the current working directory.
+If
+.Fn symlinkat
+is passed the special value
+.Dv AT_FDCWD
+in the
+.Fa fd
+parameter, the current working directory is used and the behavior is
+identical to a call to
+.Fn symlink .
+.Sh RETURN VALUES
+.Rv -std symlink
+.Sh ERRORS
+The symbolic link succeeds unless:
+.Bl -tag -width Er
+.It Bq Er ENOTDIR
+A component of the
+.Fa name2
+path prefix is not a directory.
+.It Bq Er ENAMETOOLONG
+A component of the
+.Fa name2
+pathname exceeded 255 characters,
+or the entire length of either path name exceeded 1023 characters.
+.It Bq Er ENOENT
+A component of the
+.Fa name2
+path prefix does not exist.
+.It Bq Er EACCES
+A component of the
+.Fa name2
+path prefix denies search permission, or write permission is denied on the
+parent directory of the file to be created.
+.It Bq Er ELOOP
+Too many symbolic links were encountered in translating the
+.Fa name2
+path name.
+.It Bq Er EEXIST
+The path name pointed at by the
+.Fa name2
+argument
+already exists.
+.It Bq Er EPERM
+The parent directory of the file named by
+.Fa name2
+has its immutable flag set, see the
+.Xr chflags 2
+manual page for more information.
+.It Bq Er EIO
+An I/O error occurred while making the directory entry for
+.Fa name2 ,
+or allocating the inode for
+.Fa name2 ,
+or writing out the link contents of
+.Fa name2 .
+.It Bq Er EROFS
+The file
+.Fa name2
+would reside on a read-only file system.
+.It Bq Er ENOSPC
+The directory in which the entry for the new symbolic link is being placed
+cannot be extended because there is no space left on the file
+system containing the directory.
+.It Bq Er ENOSPC
+The new symbolic link cannot be created because
+there is no space left on the file
+system that will contain the symbolic link.
+.It Bq Er ENOSPC
+There are no free inodes on the file system on which the
+symbolic link is being created.
+.It Bq Er EDQUOT
+The directory in which the entry for the new symbolic link
+is being placed cannot be extended because the
+user's quota of disk blocks on the file system
+containing the directory has been exhausted.
+.It Bq Er EDQUOT
+The new symbolic link cannot be created because the user's
+quota of disk blocks on the file system that will
+contain the symbolic link has been exhausted.
+.It Bq Er EDQUOT
+The user's quota of inodes on the file system on
+which the symbolic link is being created has been exhausted.
+.It Bq Er EIO
+An I/O error occurred while making the directory entry or allocating the inode.
+.It Bq Er EFAULT
+The
+.Fa name1
+or
+.Fa name2
+argument
+points outside the process's allocated address space.
+.El
+.Pp
+In addition to the errors returned by the
+.Fn symlink ,
+the
+.Fn symlinkat
+may fail if:
+.Bl -tag -width Er
+.It Bq Er EBADF
+The
+.Fa name2
+argument does not specify an absolute path and the
+.Fa fd
+argument is neither
+.Dv AT_FDCWD
+nor a valid file descriptor open for searching.
+.It Bq Er ENOTDIR
+The
+.Fa name2
+argument is not an absolute path and
+.Fa fd
+is neither
+.Dv AT_FDCWD
+nor a file descriptor associated with a directory.
+.El
+.Sh SEE ALSO
+.Xr ln 1 ,
+.Xr chflags 2 ,
+.Xr link 2 ,
+.Xr lstat 2 ,
+.Xr readlink 2 ,
+.Xr unlink 2 ,
+.Xr symlink 7
+.Sh STANDARDS
+The
+.Fn symlinkat
+system call follows The Open Group Extended API Set 2 specification.
+.Sh HISTORY
+The
+.Fn symlink
+system call appeared in
+.Bx 4.2 .
+The
+.Fn symlinkat
+system call appeared in
+.Fx 8.0 .
diff --git a/lib/libc/sys/sync.2 b/lib/libc/sys/sync.2
new file mode 100644
index 0000000..ff588ff
--- /dev/null
+++ b/lib/libc/sys/sync.2
@@ -0,0 +1,77 @@
+.\" Copyright (c) 1980, 1991, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"     @(#)sync.2	8.1 (Berkeley) 6/4/93
+.\" $FreeBSD$
+.\"
+.Dd June 4, 1993
+.Dt SYNC 2
+.Os
+.Sh NAME
+.Nm sync
+.Nd "schedule file system updates"
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In unistd.h
+.Ft void
+.Fn sync void
+.Sh DESCRIPTION
+The
+.Fn sync
+system call forces a write of dirty (modified) buffers
+in the block buffer cache out
+to disk.
+The kernel keeps this information in core to reduce
+the number of disk I/O transfers required by the system.
+As information in the cache is lost after a system crash, a
+.Fn sync
+system call is issued
+frequently
+by the user process
+.Xr syncer 4
+(about every 30 seconds).
+.Pp
+The
+.Xr fsync 2
+system call
+may be used to synchronize individual file descriptor
+attributes.
+.Sh SEE ALSO
+.Xr fsync 2 ,
+.Xr syncer 4 ,
+.Xr sync 8
+.Sh HISTORY
+The
+.Fn sync
+function appeared in
+.At v6 .
+.Sh BUGS
+The
+.Fn sync
+system call
+may return before the buffers are completely flushed.
diff --git a/lib/libc/sys/sysarch.2 b/lib/libc/sys/sysarch.2
new file mode 100644
index 0000000..bd060d1
--- /dev/null
+++ b/lib/libc/sys/sysarch.2
@@ -0,0 +1,81 @@
+.\"	$NetBSD: sysarch.2,v 1.6 1998/02/25 21:24:57 perry Exp $
+.\" $FreeBSD$
+.\"
+.\" Copyright (c) 1980, 1991 Regents of the University of California.
+.\" All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"     from: @(#)syscall.2	6.3 (Berkeley) 3/10/91
+.\"
+.Dd October 11, 1993
+.Dt SYSARCH 2
+.Os
+.Sh NAME
+.Nm sysarch
+.Nd architecture-dependent system call
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In machine/sysarch.h
+.Ft int
+.Fn sysarch "int number" "void *args"
+.Sh DESCRIPTION
+The
+.Fn sysarch
+system call
+performs the architecture-dependent function
+specified by
+.Fa number
+with the arguments specified by the
+.Fa args
+pointer.
+The
+.Fa args
+argument
+is a pointer to a structure defining the actual
+arguments of the function.
+Symbolic constants and argument structures
+for the architecture-dependent
+functions can be found in the header file
+.In machine/sysarch.h .
+.Pp
+The
+.Fn sysarch
+system call should never be called directly by
+user programs.
+Instead, they should access
+its functions using the architecture-dependent
+library.
+.Sh RETURN VALUES
+See the manual pages for specific architecture-dependent system calls
+for information about their return values.
+.Sh SEE ALSO
+.Xr i386_get_ioperm 2 ,
+.Xr i386_get_ldt 2 ,
+.Xr i386_vm86 2
+.Sh HISTORY
+This manual page was taken from
+.Nx .
diff --git a/lib/libc/sys/syscall.2 b/lib/libc/sys/syscall.2
new file mode 100644
index 0000000..a9402d6
--- /dev/null
+++ b/lib/libc/sys/syscall.2
@@ -0,0 +1,77 @@
+.\" Copyright (c) 1980, 1991, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"     @(#)syscall.2	8.1 (Berkeley) 6/16/93
+.\" $FreeBSD$
+.\"
+.Dd June 16, 1993
+.Dt SYSCALL 2
+.Os
+.Sh NAME
+.Nm syscall ,
+.Nm __syscall
+.Nd indirect system call
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In sys/syscall.h
+.In unistd.h
+.Ft int
+.Fn syscall "int number" ...
+.Ft off_t
+.Fn __syscall "quad_t number" ...
+.Sh DESCRIPTION
+The
+.Fn syscall
+function
+performs the system call whose assembly language
+interface has the specified
+.Fa number
+with the specified arguments.
+Symbolic constants for system calls can be found in the header file
+.In sys/syscall.h .
+The
+.Fn __syscall
+form should be used when one or more of the arguments is a
+64-bit argument to ensure that argument alignment is correct.
+This system call is useful for testing new system calls that
+do not have entries in the C library.
+.Sh RETURN VALUES
+The return values are defined by the system call being invoked.
+In general, a 0 return value indicates success.
+A -1 return value indicates an error,
+and an error code is stored in
+.Va errno .
+.Sh HISTORY
+The
+.Fn syscall
+function appeared in
+.Bx 4.0 .
+.Sh BUGS
+There is no way to simulate system calls that have multiple return values
+such as
+.Xr pipe 2 .
diff --git a/lib/libc/sys/timer_create.2 b/lib/libc/sys/timer_create.2
new file mode 100644
index 0000000..3fb415c
--- /dev/null
+++ b/lib/libc/sys/timer_create.2
@@ -0,0 +1,165 @@
+.\" Copyright (c) 2005 David Xu <davidxu@FreeBSD.org>
+.\" All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice(s), this list of conditions and the following disclaimer as
+.\"    the first lines of this file unmodified other than the possible
+.\"    addition of one or more copyright notices.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice(s), this list of conditions and the following disclaimer in
+.\"    the documentation and/or other materials provided with the
+.\"    distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) ``AS IS'' AND ANY
+.\" EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+.\" PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) BE
+.\" LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
+.\" BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+.\" WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
+.\" OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
+.\" EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd January 12, 2009
+.Dt TIMER_CREATE 2
+.Os
+.Sh NAME
+.Nm timer_create
+.Nd "create a per-process timer (REALTIME)"
+.Sh LIBRARY
+.Lb librt
+.Sh SYNOPSIS
+.In time.h
+.In signal.h
+.Ft int
+.Fo timer_create
+.Fa "clockid_t clockid" "struct sigevent *restrict evp"
+.Fa "timer_t *restrict timerid"
+.Fc
+.Sh DESCRIPTION
+The
+.Fn timer_create
+system call creates a per-process timer using the specified clock,
+.Fa clock_id ,
+as the timing base.
+The
+.Fn timer_create
+system call returns, in the location referenced by
+.Fa timerid ,
+a timer ID of type
+.Vt timer_t
+used to identify the timer in timer requests.
+This timer ID is unique within the calling process until the timer is deleted.
+The particular clock,
+.Fa clock_id ,
+is defined in
+.In time.h .
+The timer whose ID is returned is in a disarmed state upon return from
+.Fn timer_create .
+.Pp
+The
+.Fa evp
+argument, if
+.Pf non- Dv NULL ,
+points to a
+.Vt sigevent
+structure.
+This structure,
+allocated by the application, defines the asynchronous notification to occur
+when the timer expires.
+If the
+.Fa evp
+argument is
+.Dv NULL ,
+the effect is as if the
+.Fa evp
+argument pointed to a
+.Vt sigevent
+structure with the
+.Va sigev_notify
+member having the value
+.Dv SIGEV_SIGNAL ,
+the
+.Va sigev_signo
+having a default signal number, and the
+.Va sigev_value
+member having
+the value of the timer ID.
+.Pp
+The implementations supports a
+.Fa clock_id
+of
+.Dv CLOCK_REALTIME
+or
+.Dv CLOCK_MONOTONIC .
+.Pp
+If
+.Fa evp->sigev_notify
+is
+.Dv SIGEV_THREAD
+and
+.Fa sev->sigev_notify_attributes
+is not
+.Dv NULL ,
+if the attribute pointed to by
+.Fa sev->sigev_notify_attributes
+has
+a thread stack address specified by a call to
+.Fn pthread_attr_setstack
+or
+.Fn pthread_attr_setstackaddr ,
+the results are unspecified if the signal is generated more than once.
+.Sh RETURN VALUES
+If the call succeeds,
+.Fn timer_create
+returns zero and updates the location referenced by
+.Fa timerid
+to a
+.Vt timer_t ,
+which can be passed to the per-process timer calls.
+If an error
+occurs, the system call returns a value of \-1
+and the global variable
+.Va errno
+is set to indicate the
+error.
+The value of
+.Fa timerid
+is undefined if an error occurs.
+.Sh ERRORS
+The
+.Fn timer_create
+system call
+will fail if:
+.Bl -tag -width Er
+.It Bq Er EAGAIN
+The calling process has already created all of the timers it is allowed by
+this implementation.
+.It Bq Er EINVAL
+The specified clock ID is not supported.
+.It Bq Er EFAULT
+Any arguments point outside the allocated address space or there is a
+memory protection fault.
+.El
+.Sh SEE ALSO
+.Xr clock_getres 2 ,
+.Xr timer_delete 2 ,
+.Xr timer_getoverun 2 ,
+.Xr siginfo 3
+.Sh STANDARDS
+The
+.Fn timer_create
+system call conforms to
+.St -p1003.1-2004
+.Sh HISTORY
+Support for
+.Tn POSIX
+per-process timer first appeared in
+.Fx 7.0 .
diff --git a/lib/libc/sys/timer_delete.2 b/lib/libc/sys/timer_delete.2
new file mode 100644
index 0000000..a1b245a
--- /dev/null
+++ b/lib/libc/sys/timer_delete.2
@@ -0,0 +1,80 @@
+.\" Copyright (c) 2005 David Xu <davidxu@FreeBSD.org>
+.\" All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice(s), this list of conditions and the following disclaimer as
+.\"    the first lines of this file unmodified other than the possible
+.\"    addition of one or more copyright notices.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice(s), this list of conditions and the following disclaimer in
+.\"    the documentation and/or other materials provided with the
+.\"    distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) ``AS IS'' AND ANY
+.\" EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+.\" PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) BE
+.\" LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
+.\" BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+.\" WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
+.\" OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
+.\" EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd September 11, 2000
+.Dt TIMER_DELETE 2
+.Os
+.Sh NAME
+.Nm timer_delete
+.Nd "delete a per-process timer (REALTIME)"
+.Sh LIBRARY
+.Lb librt
+.Sh SYNOPSIS
+.In time.h
+.Ft int
+.Fn timer_delete "timer_t timerid"
+.Sh DESCRIPTION
+The
+.Fn timer_delete
+system call
+deletes the specified timer,
+.Fa timerid ,
+previously created by the
+.Xr timer_create 2
+system call.
+If the timer is armed when
+.Fn timer_delete
+is called, the behavior is as if the timer is automatically disarmed before
+removal.
+Pending signals for the deleted timer are cleared.
+.Sh RETURN VALUES
+.Rv -std
+.Sh ERRORS
+The
+.Fn timer_delete
+system call
+will fail if:
+.Bl -tag -width Er
+.It Bq Er EINVAL
+The timer ID specified by
+.Fa timerid
+is not a valid timer ID.
+.El
+.Sh SEE ALSO
+.Xr timer_create 2
+.Sh STANDARDS
+The
+.Fn timer_delete
+system call conforms to
+.St -p1003.1-2004
+.Sh HISTORY
+Support for
+.Tn POSIX
+per-process timer first appeared in
+.Fx 7.0 .
diff --git a/lib/libc/sys/timer_settime.2 b/lib/libc/sys/timer_settime.2
new file mode 100644
index 0000000..4b9d938
--- /dev/null
+++ b/lib/libc/sys/timer_settime.2
@@ -0,0 +1,265 @@
+.\" Copyright (c) 2005 David Xu <davidxu@FreeBSD.org>
+.\" All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice(s), this list of conditions and the following disclaimer as
+.\"    the first lines of this file unmodified other than the possible
+.\"    addition of one or more copyright notices.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice(s), this list of conditions and the following disclaimer in
+.\"    the documentation and/or other materials provided with the
+.\"    distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) ``AS IS'' AND ANY
+.\" EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+.\" PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) BE
+.\" LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
+.\" BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+.\" WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
+.\" OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
+.\" EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd September 11, 2000
+.Dt TIMER_SETTIME 2
+.Os
+.Sh NAME
+.Nm timer_getoverrun ,
+.Nm timer_gettime ,
+.Nm timer_settime
+.Nd "per-process timers (REALTIME)"
+.Sh LIBRARY
+.Lb librt
+.Sh SYNOPSIS
+.In time.h
+.Ft int
+.Fn timer_getoverrun "timer_t timerid"
+.Ft int
+.Fn timer_gettime "timer_t timerid" "struct itimerspec *value"
+.Ft int
+.Fo timer_settime
+.Fa "timer_t timerid" "int flags" "const struct itimerspec *restrict value"
+.Fa "struct itimerspec *restrict ovalue"
+.Fc
+.Sh DESCRIPTION
+The
+.Fn timer_gettime
+system call stores the amount of time until the specified timer,
+.Fa timerid ,
+expires and the reload value of the timer into the space pointed to by the
+.Fa value
+argument.
+The
+.Va it_value
+member of this structure contains the amount of time
+before the timer expires, or zero if the timer is disarmed.
+This value is
+returned as the interval until timer expiration, even if the timer was armed
+with absolute time.
+The
+.Va it_interval
+member of
+.Fa value
+contains the reload
+value last set by
+.Fn timer_settime .
+.Pp
+The
+.Fn timer_settime
+system call sets the time until the next expiration of the timer specified
+by
+.Fa timerid
+from the
+.Va it_value
+member of the
+.Fa value
+argument and arms the timer if the
+.Va it_value
+member of
+.Fa value
+is non-zero.
+If the specified timer was already
+armed when
+.Fn timer_settime
+is called, this call resets the time until next expiration to the value
+specified.
+If the
+.Va it_value
+member of
+.Fa value
+is zero, the timer is disarmed.
+If the timer is disarmed, then pending signal is removed.
+.Pp
+If the flag
+.Dv TIMER_ABSTIME
+is not set in the argument
+.Fa flags ,
+.Fn timer_settime
+behaves as if the time until next expiration is set to
+be equal to the interval specified by the
+.Va it_value
+member of
+.Fa value .
+That is,
+the timer expires in
+.Va it_value
+nanoseconds from when the call is made.
+If the flag
+.Dv TIMER_ABSTIME
+is set in the argument
+.Fa flags ,
+.Fn timer_settime
+behaves as if the time until next expiration is set to be equal to the
+difference between the absolute time specified by the it_value member of
+value and the current value of the clock associated with
+.Fa timerid .
+That is, the timer expires when the clock reaches the value specified by the
+.Va it_value
+member of
+.Fa value .
+If the specified time has already passed, the
+system call succeeds and the expiration notification is made.
+.Pp
+The reload value of the timer is set to the value specified by the
+.Va it_interval
+member of
+.Fa value .
+When a timer is armed with a non-zero
+.Va it_interval ,
+a periodic
+(or repetitive) timer is specified.
+.Pp
+Time values that are between two consecutive non-negative integer multiples of
+the resolution of the specified timer are rounded up to the larger multiple of
+the resolution.
+Quantization error will not cause the timer to expire earlier
+than the rounded time value.
+.Pp
+If the argument
+.Fa ovalue
+is not
+.Dv NULL ,
+the
+.Fn timer_settime
+system call stores, in the location referenced by
+.Fa ovalue ,
+a value representing
+the previous amount of time before the timer would have expired, or zero if the
+timer was disarmed, together with the previous timer reload value.
+Timers do not
+expire before their scheduled time.
+.Pp
+Only a single signal is queued to the process for a given timer at any point in
+time.
+When a timer for which a signal is still pending expires, no signal is
+queued, and a timer overrun will occur.
+When a timer expiration signal is
+accepted by a process, the
+.Fn timer_getoverrun
+system call returns the timer expiration overrun count for the specified timer.
+The overrun count returned contains the number of extra timer expirations that
+occurred between the time the signal was generated (queued) and when it was
+accepted, up to but not including an maximum of
+.Brq Dv DELAYTIMER_MAX .
+If the number of
+such extra expirations is greater than or equal to
+.Brq Dv DELAYTIMER_MAX ,
+then the overrun count is set to
+.Brq Dv DELAYTIMER_MAX .
+The value returned by
+.Fn timer_getoverrun
+applies to the most recent expiration signal acceptance for the timer.
+If no
+expiration signal has been delivered for the timer, the return value of
+.Fn timer_getoverrun
+is unspecified.
+.Sh RETURN VALUES
+If the
+.Fn timer_getoverrun
+system call succeeds, it returns the timer expiration overrun count as explained
+above.
+Otherwise the value \-1 is returned, and the global variable
+.Va errno
+is set to indicate the error.
+.Pp
+.Rv -std timer_gettime timer_settime
+.Sh ERRORS
+The
+.Fn timer_settime
+system call
+will fail if:
+.Bl -tag -width Er
+.It Bq Er EINVAL
+A
+.Fa value
+structure specified a nanosecond value less than zero or greater than
+or equal to 1000 million, and the
+.Va it_value
+member of that structure did not
+specify zero seconds and nanoseconds.
+.El
+.Pp
+These system calls may fail if:
+.Bl -tag -width Er
+.It Bq Er EINVAL
+The
+.Fa timerid
+argument does not correspond to an ID returned by
+.Fn timer_create
+but not yet deleted by
+.Fn timer_delete .
+.El
+.Pp
+The
+.Fn timer_settime
+system call may fail if:
+.Bl -tag -width Er
+.It Bq Er EINVAL
+The
+.Va it_interval
+member of
+.Fa value
+is not zero and the timer was created with
+notification by creation of a new thread
+.Va ( sigev_sigev_notify
+was
+.Dv SIGEV_THREAD )
+and a fixed stack address has been set in the thread attribute pointed to by
+.Va sigev_notify_attributes .
+.El
+.Pp
+The
+.Fn timer_gettime
+and
+.Fn timer_settime
+system calls
+may fail if:
+.Bl -tag -width Er
+.It Bq Er EFAULT
+Any arguments point outside the allocated address space or there is a
+memory protection fault.
+.El
+.Sh SEE ALSO
+.Xr clock_getres 2 ,
+.Xr timer_create 2 ,
+.Xr siginfo 3
+.Sh STANDARDS
+The
+.Fn timer_getoverrun ,
+.Fn timer_gettime ,
+and
+.Fn timer_settime
+system calls conform to
+.St -p1003.1-2004
+.Sh HISTORY
+Support for
+.Tn POSIX
+per-process timer first appeared in
+.Fx 7.0 .
diff --git a/lib/libc/sys/truncate.2 b/lib/libc/sys/truncate.2
new file mode 100644
index 0000000..f06c1eb
--- /dev/null
+++ b/lib/libc/sys/truncate.2
@@ -0,0 +1,153 @@
+.\" Copyright (c) 1983, 1991, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"     @(#)truncate.2	8.1 (Berkeley) 6/4/93
+.\" $FreeBSD$
+.\"
+.Dd December 13, 2006
+.Dt TRUNCATE 2
+.Os
+.Sh NAME
+.Nm truncate ,
+.Nm ftruncate
+.Nd truncate or extend a file to a specified length
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In unistd.h
+.Ft int
+.Fn truncate "const char *path" "off_t length"
+.Ft int
+.Fn ftruncate "int fd" "off_t length"
+.Sh DESCRIPTION
+The
+.Fn truncate
+system call
+causes the file named by
+.Fa path
+or referenced by
+.Fa fd
+to be truncated or extended to
+.Fa length
+bytes in size.
+If the file
+was larger than this size, the extra data
+is lost.
+If the file was smaller than this size,
+it will be extended as if by writing bytes
+with the value zero.
+With
+.Fn ftruncate ,
+the file must be open for writing.
+.Sh RETURN VALUES
+.Rv -std
+If the file to be modified is not a directory or
+a regular file, the
+.Fn truncate
+call has no effect and returns the value 0.
+.Sh ERRORS
+The
+.Fn truncate
+system call
+succeeds unless:
+.Bl -tag -width Er
+.It Bq Er ENOTDIR
+A component of the path prefix is not a directory.
+.It Bq Er ENAMETOOLONG
+A component of a pathname exceeded 255 characters,
+or an entire path name exceeded 1023 characters.
+.It Bq Er ENOENT
+The named file does not exist.
+.It Bq Er EACCES
+Search permission is denied for a component of the path prefix.
+.It Bq Er EACCES
+The named file is not writable by the user.
+.It Bq Er ELOOP
+Too many symbolic links were encountered in translating the pathname.
+.It Bq Er EPERM
+The named file has its immutable or append-only flag set, see the
+.Xr chflags 2
+manual page for more information.
+.It Bq Er EISDIR
+The named file is a directory.
+.It Bq Er EROFS
+The named file resides on a read-only file system.
+.It Bq Er ETXTBSY
+The file is a pure procedure (shared text) file that is being executed.
+.It Bq Er EFBIG
+The
+.Fa length
+argument was greater than the maximum file size.
+.It Bq Er EINVAL
+The
+.Fa length
+argument was less than 0.
+.It Bq Er EIO
+An I/O error occurred updating the inode.
+.It Bq Er EFAULT
+The
+.Fa path
+argument
+points outside the process's allocated address space.
+.El
+.Pp
+The
+.Fn ftruncate
+system call
+succeeds unless:
+.Bl -tag -width Er
+.It Bq Er EBADF
+The
+.Fa fd
+argument
+is not a valid descriptor.
+.It Bq Er EINVAL
+The
+.Fa fd
+argument
+references a socket, not a file.
+.It Bq Er EINVAL
+The
+.Fa fd
+descriptor
+is not open for writing.
+.El
+.Sh SEE ALSO
+.Xr chflags 2 ,
+.Xr open 2
+.Sh HISTORY
+The
+.Fn truncate
+system call appeared in
+.Bx 4.2 .
+.Sh BUGS
+These calls should be generalized to allow ranges
+of bytes in a file to be discarded.
+.Pp
+Use of
+.Fn truncate
+to extend a file is not portable.
diff --git a/lib/libc/sys/truncate.c b/lib/libc/sys/truncate.c
new file mode 100644
index 0000000..375c9d9
--- /dev/null
+++ b/lib/libc/sys/truncate.c
@@ -0,0 +1,55 @@
+/*
+ * Copyright (c) 1992, 1993
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#if defined(LIBC_SCCS) && !defined(lint)
+static char sccsid[] = "@(#)truncate.c	8.1 (Berkeley) 6/17/93";
+#endif /* LIBC_SCCS and not lint */
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/types.h>
+#include <sys/syscall.h>
+#include <unistd.h>
+#include "libc_private.h"
+
+/*
+ * This function provides 64-bit offset padding that
+ * is not supplied by GCC 1.X but is supplied by GCC 2.X.
+ */
+int
+truncate(path, length)
+	const char	*path;
+	off_t	length;
+{
+
+	if (__getosreldate() >= 700051)
+		return(__sys_truncate(path, length));
+	else
+		return(__sys_freebsd6_truncate(path, 0, length));
+}
diff --git a/lib/libc/sys/umask.2 b/lib/libc/sys/umask.2
new file mode 100644
index 0000000..025a726
--- /dev/null
+++ b/lib/libc/sys/umask.2
@@ -0,0 +1,88 @@
+.\" Copyright (c) 1980, 1991, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"     @(#)umask.2	8.1 (Berkeley) 6/4/93
+.\" $FreeBSD$
+.\"
+.Dd June 4, 1993
+.Dt UMASK 2
+.Os
+.Sh NAME
+.Nm umask
+.Nd set file creation mode mask
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In sys/stat.h
+.Ft mode_t
+.Fn umask "mode_t numask"
+.Sh DESCRIPTION
+The
+.Fn umask
+routine sets the process's file mode creation mask to
+.Fa numask
+and returns the previous value of the mask.
+The 9 low-order
+access permission
+bits of
+.Fa numask
+are used by system calls, including
+.Xr open 2 ,
+.Xr mkdir 2 ,
+and
+.Xr mkfifo 2 ,
+to turn off corresponding bits
+requested in file mode.
+(See
+.Xr chmod 2 ) .
+This clearing allows each user to restrict the default access
+to his files.
+.Pp
+The default mask value is S_IWGRP|S_IWOTH (022, write access for the
+owner only).
+Child processes inherit the mask of the calling process.
+.Sh RETURN VALUES
+The previous value of the file mode mask is returned by the call.
+.Sh ERRORS
+The
+.Fn umask
+system call is always successful.
+.Sh SEE ALSO
+.Xr chmod 2 ,
+.Xr mkfifo 2 ,
+.Xr mknod 2 ,
+.Xr open 2
+.Sh STANDARDS
+The
+.Fn umask
+system call is expected to conform to
+.St -p1003.1-90 .
+.Sh HISTORY
+The
+.Fn umask
+function appeared in
+.At v7 .
diff --git a/lib/libc/sys/undelete.2 b/lib/libc/sys/undelete.2
new file mode 100644
index 0000000..f686f5e
--- /dev/null
+++ b/lib/libc/sys/undelete.2
@@ -0,0 +1,105 @@
+.\" Copyright (c) 1994
+.\"	Jan-Simon Pendry
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"     @(#)undelete.2	8.4 (Berkeley) 10/18/94
+.\" $FreeBSD$
+.\"
+.Dd January 22, 2006
+.Dt UNDELETE 2
+.Os
+.Sh NAME
+.Nm undelete
+.Nd attempt to recover a deleted file
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In unistd.h
+.Ft int
+.Fn undelete "const char *path"
+.Sh DESCRIPTION
+The
+.Fn undelete
+system call attempts to recover the deleted file named by
+.Fa path .
+Currently, this works only when the named object
+is a whiteout in a union file system.
+The system call removes the whiteout causing
+any objects in a lower layer of the
+union stack to become visible once more.
+.Pp
+Eventually, the
+.Fn undelete
+functionality may be expanded to other file systems able to recover
+deleted files such as the log-structured file system.
+.Sh RETURN VALUES
+.Rv -std undelete
+.Sh ERRORS
+The
+.Fn undelete
+succeeds unless:
+.Bl -tag -width Er
+.It Bq Er ENOTDIR
+A component of the path prefix is not a directory.
+.It Bq Er ENAMETOOLONG
+A component of a pathname exceeded 255 characters,
+or an entire path name exceeded 1023 characters.
+.It Bq Er EEXIST
+The path does not reference a whiteout.
+.It Bq Er ENOENT
+The named whiteout does not exist.
+.It Bq Er EACCES
+Search permission is denied for a component of the path prefix.
+.It Bq Er EACCES
+Write permission is denied on the directory containing the name
+to be undeleted.
+.It Bq Er ELOOP
+Too many symbolic links were encountered in translating the pathname.
+.It Bq Er EPERM
+The directory containing the name is marked sticky,
+and the containing directory is not owned by the effective user ID.
+.It Bq Er EINVAL
+The last component of the path is
+.Ql .. .
+.It Bq Er EIO
+An I/O error occurred while updating the directory entry.
+.It Bq Er EROFS
+The name resides on a read-only file system.
+.It Bq Er EFAULT
+The
+.Fa path
+argument
+points outside the process's allocated address space.
+.El
+.Sh SEE ALSO
+.Xr unlink 2 ,
+.Xr mount_unionfs 8
+.Sh HISTORY
+The
+.Fn undelete
+system call first appeared in
+.Bx 4.4 Lite .
diff --git a/lib/libc/sys/unlink.2 b/lib/libc/sys/unlink.2
new file mode 100644
index 0000000..bb27085
--- /dev/null
+++ b/lib/libc/sys/unlink.2
@@ -0,0 +1,225 @@
+.\" Copyright (c) 1980, 1991, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"     @(#)unlink.2	8.1 (Berkeley) 6/4/93
+.\" $FreeBSD$
+.\"
+.Dd April 25, 2010
+.Dt UNLINK 2
+.Os
+.Sh NAME
+.Nm unlink ,
+.Nm unlinkat
+.Nd remove directory entry
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In unistd.h
+.Ft int
+.Fn unlink "const char *path"
+.Ft int
+.Fn unlinkat "int fd" "const char *path" "int flag"
+.Sh DESCRIPTION
+The
+.Fn unlink
+system call
+removes the link named by
+.Fa path
+from its directory and decrements the link count of the
+file which was referenced by the link.
+If that decrement reduces the link count of the file
+to zero,
+and no process has the file open, then
+all resources associated with the file are reclaimed.
+If one or more process have the file open when the last link is removed,
+the link is removed, but the removal of the file is delayed until
+all references to it have been closed.
+The
+.Fa path
+argument
+may not be a directory.
+.Pp
+The
+.Fn unlinkat
+system call is equivalent to
+.Fn unlink
+or
+.Fn rmdir
+except in the case where
+.Fa path
+specifies a relative path.
+In this case the directory entry to be removed is determined
+relative to the directory associated with the file descriptor
+.Fa fd
+instead of the current working directory.
+.Pp
+The values for
+.Fa flag
+are constructed by a bitwise-inclusive OR of flags from the following list,
+defined in
+.In fcntl.h :
+.Bl -tag -width indent
+.It Dv AT_REMOVEDIR
+Remove the directory entry specified by
+.Fa fd
+and
+.Fa path
+as a directory, not a normal file.
+.El
+.Pp
+If
+.Fn unlinkat
+is passed the special value
+.Dv AT_FDCWD
+in the
+.Fa fd
+parameter, the current working directory is used and the behavior is
+identical to a call to
+.Fa unlink
+or
+.Fa rmdir
+respectively, depending on whether or not the
+.Dv AT_REMOVEDIR
+bit is set in flag.
+.Sh RETURN VALUES
+.Rv -std unlink
+.Sh ERRORS
+The
+.Fn unlink
+succeeds unless:
+.Bl -tag -width Er
+.It Bq Er ENOTDIR
+A component of the path prefix is not a directory.
+.It Bq Er EISDIR
+The named file is a directory.
+.It Bq Er ENAMETOOLONG
+A component of a pathname exceeded 255 characters,
+or an entire path name exceeded 1023 characters.
+.It Bq Er ENOENT
+The named file does not exist.
+.It Bq Er EACCES
+Search permission is denied for a component of the path prefix.
+.It Bq Er EACCES
+Write permission is denied on the directory containing the link
+to be removed.
+.It Bq Er ELOOP
+Too many symbolic links were encountered in translating the pathname.
+.It Bq Er EPERM
+The named file is a directory.
+.It Bq Er EPERM
+The named file has its immutable, undeletable or append-only flag set, see the
+.Xr chflags 2
+manual page for more information.
+.It Bq Er EPERM
+The parent directory of the named file has its immutable or append-only flag
+set.
+.It Bq Er EPERM
+The directory containing the file is marked sticky,
+and neither the containing directory nor the file to be removed
+are owned by the effective user ID.
+.It Bq Er EIO
+An I/O error occurred while deleting the directory entry
+or deallocating the inode.
+.It Bq Er EROFS
+The named file resides on a read-only file system.
+.It Bq Er EFAULT
+The
+.Fa path
+argument
+points outside the process's allocated address space.
+.El
+.Pp
+In addition to the errors returned by the
+.Fn unlink ,
+the
+.Fn unlinkat
+may fail if
+.Bl -tag -width Er
+.It Bq Er EBADF
+The
+.Fa path
+argument does not specify an absolute path and the
+.Fa fd
+argument is neither
+.Dv AT_FDCWD
+nor a valid file descriptor open for searching.
+.It Bq Er ENOTEMPTY
+The
+.Fa flag
+parameter has the
+.Dv AT_REMOVEDIR
+bit set and the
+.Fa path
+argument names a directory that is not an empty directory,
+or there are hard links to the directory other than dot or
+a single entry in dot-dot.
+.It Bq Er ENOTDIR
+The
+.Fa flag
+parameter has the
+.Dv AT_REMOVEDIR
+bit set and
+.Fa path
+does not name a directory.
+.It Bq Er EINVAL
+The value of the
+.Fa flag
+argument is not valid.
+.It Bq Er ENOTDIR
+The
+.Fa path
+argument is not an absolute path and
+.Fa fd
+is neither
+.Dv AT_FDCWD
+nor a file descriptor associated with a directory.
+.El
+.Sh SEE ALSO
+.Xr chflags 2 ,
+.Xr close 2 ,
+.Xr link 2 ,
+.Xr rmdir 2 ,
+.Xr symlink 7
+.Sh STANDARDS
+The
+.Fn unlinkat
+system call follows The Open Group Extended API Set 2 specification.
+.Sh HISTORY
+The
+.Fn unlink
+function appeared in
+.At v6 .
+The
+.Fn unlinkat
+system call appeared in
+.Fx 8.0 .
+.Pp
+The
+.Fn unlink
+system call traditionally allows the super-user to unlink directories which
+can damage the file system integrity.
+This implementation no longer permits it.
diff --git a/lib/libc/sys/utimes.2 b/lib/libc/sys/utimes.2
new file mode 100644
index 0000000..74a7dd0
--- /dev/null
+++ b/lib/libc/sys/utimes.2
@@ -0,0 +1,275 @@
+.\"	$NetBSD: utimes.2,v 1.13 1999/03/22 19:45:11 garbled Exp $
+.\"
+.\" Copyright (c) 1990, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"     @(#)utimes.2	8.1 (Berkeley) 6/4/93
+.\" $FreeBSD$
+.\"
+.Dd April 10, 2008
+.Dt UTIMES 2
+.Os
+.Sh NAME
+.Nm utimes ,
+.Nm lutimes ,
+.Nm futimes ,
+.Nm futimesat
+.Nd set file access and modification times
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In sys/time.h
+.Ft int
+.Fn utimes "const char *path" "const struct timeval *times"
+.Ft int
+.Fn lutimes "const char *path" "const struct timeval *times"
+.Ft int
+.Fn futimes "int fd" "const struct timeval *times"
+.Ft int
+.Fn futimesat "int fd" "const char *path" "const struct timeval times[2]"
+.Sh DESCRIPTION
+The access and modification times of the file named by
+.Fa path
+or referenced by
+.Fa fd
+are changed as specified by the argument
+.Fa times .
+.Pp
+If
+.Fa times
+is
+.Dv NULL ,
+the access and modification times are set to the current time.
+The caller must be the owner of the file, have permission to
+write the file, or be the super-user.
+.Pp
+If
+.Fa times
+is
+.No non- Ns Dv NULL ,
+it is assumed to point to an array of two timeval structures.
+The access time is set to the value of the first element, and the
+modification time is set to the value of the second element.
+For file systems that support file birth (creation) times (such as
+.Dv UFS2 ) ,
+the birth time will be set to the value of the second element
+if the second element is older than the currently set birth time.
+To set both a birth time and a modification time,
+two calls are required; the first to set the birth time
+and the second to set the (presumably newer) modification time.
+Ideally a new system call will be added that allows the setting
+of all three times at once.
+The caller must be the owner of the file or be the super-user.
+.Pp
+In either case, the inode-change-time of the file is set to the current
+time.
+.Pp
+The
+.Fn lutimes
+system call
+is like
+.Fn utimes
+except in the case where the named file is a symbolic link,
+in which case
+.Fn lutimes
+changes the access and modification times of the link,
+while
+.Fn utimes
+changes the times of the file the link references.
+.Pp
+The
+.Fn futimesat
+system call is equivalent to
+.Fn utimes
+except in the case where
+.Fa path
+specifies a relative path.
+In this case the access and modification time
+is set to that of a file relative to the directory associated with the file
+descriptor
+.Fa fd
+instead of the current working directory.
+If
+.Fn futimesat
+is passed the special value
+.Dv AT_FDCWD
+in the
+.Fa fd
+parameter, the current working directory is used and the behavior is identical to
+a call to
+.Fn utimes .
+.Sh RETURN VALUES
+.Rv -std
+.Sh ERRORS
+The
+.Fn utimes
+and
+.Fn lutimes
+system calls
+will fail if:
+.Bl -tag -width Er
+.It Bq Er EACCES
+Search permission is denied for a component of the path prefix;
+or the
+.Fa times
+argument is
+.Dv NULL
+and the effective user ID of the process does not
+match the owner of the file, and is not the super-user, and write
+access is denied.
+.It Bq Er EFAULT
+The
+.Fa path
+or
+.Fa times
+argument
+points outside the process's allocated address space.
+.It Bq Er EIO
+An I/O error occurred while reading or writing the affected inode.
+.It Bq Er ELOOP
+Too many symbolic links were encountered in translating the pathname.
+.It Bq Er ENAMETOOLONG
+A component of a pathname exceeded
+.Dv NAME_MAX
+characters, or an entire path name exceeded
+.Dv PATH_MAX
+characters.
+.It Bq Er ENOENT
+The named file does not exist.
+.It Bq Er ENOTDIR
+A component of the path prefix is not a directory.
+.It Bq Er EPERM
+The
+.Fa times
+argument is not
+.Dv NULL
+and the calling process's effective user ID
+does not match the owner of the file and is not the super-user.
+.It Bq Er EPERM
+The named file has its immutable or append-only flag set, see the
+.Xr chflags 2
+manual page for more information.
+.It Bq Er EROFS
+The file system containing the file is mounted read-only.
+.El
+.Pp
+The
+.Fn futimes
+system call
+will fail if:
+.Bl -tag -width Er
+.It Bq Er EBADF
+The
+.Fa fd
+argument
+does not refer to a valid descriptor.
+.El
+.Pp
+All of the system calls will fail if:
+.Bl -tag -width Er
+.It Bq Er EACCES
+The
+.Fa times
+argument is
+.Dv NULL
+and the effective user ID of the process does not
+match the owner of the file, and is not the super-user, and write
+access is denied.
+.It Bq Er EFAULT
+The
+.Fa times
+argument
+points outside the process's allocated address space.
+.It Bq Er EINVAL
+The
+.Va tv_usec
+component of at least one of the values specified by the
+.Fa times
+argument has a value less than 0 or greater than 999999.
+.It Bq Er EIO
+An I/O error occurred while reading or writing the affected inode.
+.It Bq Er EPERM
+The
+.Fa times
+argument is not
+.Dv NULL
+and the calling process's effective user ID
+does not match the owner of the file and is not the super-user.
+.It Bq Er EROFS
+The file system containing the file is mounted read-only.
+.El
+.Pp
+In addition to the errors returned by the
+.Fn utimes ,
+the
+.Fn futimesat
+may fail if:
+.Bl -tag -width Er
+.It Bq Er EBADF
+The
+.Fa path
+argument does not specify an absolute path and the
+.Fa fd
+argument is neither
+.Dv AT_FDCWD
+nor a valid file descriptor open for searching.
+.It Bq Er ENOTDIR
+The
+.Fa path
+argument is not an absolute path and
+.Fa fd
+is neither
+.Dv AT_FDCWD
+nor a file descriptor associated with a directory.
+.El
+.Sh SEE ALSO
+.Xr chflags 2 ,
+.Xr stat 2 ,
+.Xr utime 3
+.Sh STANDARDS
+The
+.Fn utimes
+function is expected to conform to
+.St -xpg4.2 .
+The
+.Fn futimesat
+system call follows The Open Group Extended API Set 2 specification.
+.Sh HISTORY
+The
+.Fn utimes
+system call appeared in
+.Bx 4.2 .
+The
+.Fn futimes
+and
+.Fn lutimes
+system calls first appeared in
+.Fx 3.0 .
+The
+.Fn futimesat
+system call appeared in
+.Fx 8.0 .
diff --git a/lib/libc/sys/utrace.2 b/lib/libc/sys/utrace.2
new file mode 100644
index 0000000..5177288
--- /dev/null
+++ b/lib/libc/sys/utrace.2
@@ -0,0 +1,79 @@
+.\"	$NetBSD: utrace.2,v 1.11 2003/04/24 12:17:49 wiz Exp $
+.\"
+.\" Copyright (c) 2000 The NetBSD Foundation, Inc.
+.\" All rights reserved.
+.\"
+.\" This code is derived from software contributed to The NetBSD Foundation
+.\" by Gregory McGarry <g.mcgarry@ieee.org>.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd December 28, 2000
+.Dt UTRACE 2
+.Os
+.Sh NAME
+.Nm utrace
+.Nd insert user record in ktrace log
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In sys/types.h
+.In sys/param.h
+.In sys/time.h
+.In sys/uio.h
+.In sys/ktrace.h
+.Ft int
+.Fn utrace "const void *addr" "size_t len"
+.Sh DESCRIPTION
+Adds a record to the process trace with information supplied by user.
+The record contains
+.Fa len
+bytes from memory pointed to by
+.Fa addr .
+This call only has an effect if the calling process is being traced.
+.Sh RETURN VALUES
+.Rv -std
+.Sh ERRORS
+.Bl -tag -width Er
+.It Bq Er EINVAL
+Specified data length
+.Fa len
+was bigger than
+.Dv KTR_USER_MAXLEN .
+.It Bq Er ENOMEM
+Insufficient memory to honor the request.
+.It Bq Er ENOSYS
+Currently running kernel was compiled without
+.Xr ktrace 2
+support
+.Pq Cd "options KTRACE" .
+.El
+.Sh SEE ALSO
+.Xr kdump 1 ,
+.Xr ktrace 1 ,
+.Xr ktrace 2
+.Sh HISTORY
+The
+.Fn utrace
+system call first appeared in
+.Fx 2.2 .
diff --git a/lib/libc/sys/uuidgen.2 b/lib/libc/sys/uuidgen.2
new file mode 100644
index 0000000..9c90102
--- /dev/null
+++ b/lib/libc/sys/uuidgen.2
@@ -0,0 +1,142 @@
+.\" Copyright (c) 2002 Marcel Moolenaar
+.\" All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\"
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd May 26, 2002
+.Dt UUIDGEN 2
+.Os
+.Sh NAME
+.Nm uuidgen
+.Nd generate universally unique identifiers
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In sys/uuid.h
+.Ft int
+.Fn uuidgen "struct uuid *store" "int count"
+.Sh DESCRIPTION
+The
+.Fn uuidgen
+system call generates
+.Fa count
+universally unique identifiers (UUIDs) and writes them to the buffer
+pointed to by
+.Fa store .
+The identifiers are generated according to the syntax and semantics of the
+DCE version 1 variant of universally unique identifiers.
+See below for a more in-depth description of the identifiers.
+When no IEEE 802
+address is available for the node field, a random multicast address is
+generated for each invocation of the system call.
+According to the algorithm of generating time-based UUIDs, this will also
+force a new random clock sequence, thereby increasing the likelihood for
+the identifier to be unique.
+.Pp
+When multiple identifiers are to be generated, the
+.Fn uuidgen
+system call will generate a set of identifiers that is dense in such a way
+that there is no identifier that is larger than the smallest identifier in the
+set and smaller than the largest identifier in the set and that is not already
+in the set.
+.Pp
+Universally unique identifiers, also known as globally unique identifiers
+(GUIDs), have a binary representation of 128-bits.
+The grouping and meaning of these bits is described by the following
+structure and its description of the fields that follow it:
+.Bd -literal
+struct uuid {
+	uint32_t	time_low;
+	uint16_t	time_mid;
+	uint16_t	time_hi_and_version;
+	uint8_t		clock_seq_hi_and_reserved;
+	uint8_t		clock_seq_low;
+	uint8_t		node[_UUID_NODE_LEN];
+};
+.Ed
+.Bl -tag -width ".Va clock_seq_hi_and_reserved"
+.It Va time_low
+The least significant 32 bits of a 60-bit timestamp.
+This field is stored in the native byte-order.
+.It Va time_mid
+The least significant 16 bits of the most significant 28 bits of the 60-bit
+timestamp.
+This field is stored in the native byte-order.
+.It Va time_hi_and_version
+The most significant 12 bits of the 60-bit timestamp multiplexed with a 4-bit
+version number.
+The version number is stored in the most significant 4 bits of the 16-bit
+field.
+This field is stored in the native byte-order.
+.It Va clock_seq_hi_and_reserved
+The most significant 6 bits of a 14-bit sequence number multiplexed with a
+2-bit variant value.
+Note that the width of the variant value is determined by the variant itself.
+Identifiers generated by the
+.Fn uuidgen
+system call have variant value 10b.
+the variant value is stored in the most significant bits of the field.
+.It Va clock_seq_low
+The least significant 8 bits of a 14-bit sequence number.
+.It Va node
+The 6-byte IEEE 802 (MAC) address of one of the interfaces of the node.
+If no such interface exists, a random multi-cast address is used instead.
+.El
+.Pp
+The binary representation is sensitive to byte ordering.
+Any multi-byte field is to be stored in the local or native byte-order and
+identifiers must be converted when transmitted to hosts that do not agree
+on the byte-order.
+The specification does not however document what this means in concrete
+terms and is otherwise beyond the scope of this system call.
+.Sh RETURN VALUES
+.Rv -std
+.Sh ERRORS
+The
+.Fn uuidgen
+system call can fail with:
+.Bl -tag -width Er
+.It Bq Er EFAULT
+The buffer pointed to by
+.Fa store
+could not be written to for any or all identifiers.
+.It Bq Er EINVAL
+The
+.Fa count
+argument is less than 1 or larger than the hard upper limit of 2048.
+.El
+.Sh SEE ALSO
+.Xr uuidgen 1 ,
+.Xr uuid 3
+.Sh STANDARDS
+The identifiers are represented and generated in conformance with the DCE 1.1
+RPC specification.
+The
+.Fn uuidgen
+system call is itself not part of the specification.
+.Sh HISTORY
+The
+.Fn uuidgen
+system call first appeared in
+.Fx 5.0 .
diff --git a/lib/libc/sys/vfork.2 b/lib/libc/sys/vfork.2
new file mode 100644
index 0000000..1cfaa61
--- /dev/null
+++ b/lib/libc/sys/vfork.2
@@ -0,0 +1,129 @@
+.\" Copyright (c) 1980, 1991, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"     @(#)vfork.2	8.1 (Berkeley) 6/4/93
+.\" $FreeBSD$
+.\"
+.Dd November 13, 2009
+.Dt VFORK 2
+.Os
+.Sh NAME
+.Nm vfork
+.Nd create a new process without copying the address space
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In unistd.h
+.Ft pid_t
+.Fn vfork void
+.Sh DESCRIPTION
+The
+.Fn vfork
+system call
+can be used to create new processes without fully copying the address
+space of the old process, which is horrendously inefficient in a paged
+environment.
+It is useful when the purpose of
+.Xr fork 2
+would have been to create a new system context for an
+.Xr execve 2 .
+The
+.Fn vfork
+system call
+differs from
+.Xr fork 2
+in that the child borrows the parent's memory and thread of
+control until a call to
+.Xr execve 2
+or an exit (either by a call to
+.Xr _exit 2
+or abnormally).
+The parent process is suspended while the child is using its resources.
+.Pp
+The
+.Fn vfork
+system call
+returns 0 in the child's context and (later) the pid of the child in
+the parent's context.
+.Pp
+The
+.Fn vfork
+system call
+can normally be used just like
+.Xr fork 2 .
+It does not work, however, to return while running in the child's context
+from the procedure that called
+.Fn vfork
+since the eventual return from
+.Fn vfork
+would then return to a no longer existent stack frame.
+Be careful, also, to call
+.Xr _exit 2
+rather than
+.Xr exit 3
+if you cannot
+.Xr execve 2 ,
+since
+.Xr exit 3
+will flush and close standard I/O channels, and thereby mess up the
+parent processes standard I/O data structures.
+(Even with
+.Xr fork 2
+it is wrong to call
+.Xr exit 3
+since buffered data would then be flushed twice.)
+.Sh RETURN VALUES
+Same as for
+.Xr fork 2 .
+.Sh SEE ALSO
+.Xr execve 2 ,
+.Xr _exit 2 ,
+.Xr fork 2 ,
+.Xr rfork 2 ,
+.Xr sigaction 2 ,
+.Xr wait 2 ,
+.Xr exit 3
+.Sh HISTORY
+The
+.Fn vfork
+system call appeared in
+.Bx 2.9 .
+.Sh BUGS
+To avoid a possible deadlock situation,
+processes that are children in the middle
+of a
+.Fn vfork
+are never sent
+.Dv SIGTTOU
+or
+.Dv SIGTTIN
+signals; rather,
+output or
+.Xr ioctl 2
+calls
+are allowed
+and input attempts result in an end-of-file indication.
diff --git a/lib/libc/sys/wait.2 b/lib/libc/sys/wait.2
new file mode 100644
index 0000000..2e084d2
--- /dev/null
+++ b/lib/libc/sys/wait.2
@@ -0,0 +1,352 @@
+.\" Copyright (c) 1980, 1991, 1993, 1994
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"     @(#)wait.2	8.2 (Berkeley) 4/19/94
+.\" $FreeBSD$
+.\"
+.Dd November 12, 2005
+.Dt WAIT 2
+.Os
+.Sh NAME
+.Nm wait ,
+.Nm waitpid ,
+.Nm wait4 ,
+.Nm wait3
+.Nd wait for process termination
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In sys/types.h
+.In sys/wait.h
+.Ft pid_t
+.Fn wait "int *status"
+.Ft pid_t
+.Fn waitpid "pid_t wpid" "int *status" "int options"
+.In sys/time.h
+.In sys/resource.h
+.Ft pid_t
+.Fn wait3 "int *status" "int options" "struct rusage *rusage"
+.Ft pid_t
+.Fn wait4 "pid_t wpid" "int *status" "int options" "struct rusage *rusage"
+.Sh DESCRIPTION
+The
+.Fn wait
+function suspends execution of its calling process until
+.Fa status
+information is available for a terminated child process,
+or a signal is received.
+On return from a successful
+.Fn wait
+call,
+the
+.Fa status
+area contains termination information about the process that exited
+as defined below.
+.Pp
+The
+.Fn wait4
+system call provides a more general interface for programs
+that need to wait for certain child processes,
+that need resource utilization statistics accumulated by child processes,
+or that require options.
+The other wait functions are implemented using
+.Fn wait4 .
+.Pp
+The
+.Fa wpid
+argument specifies the set of child processes for which to wait.
+If
+.Fa wpid
+is -1, the call waits for any child process.
+If
+.Fa wpid
+is 0,
+the call waits for any child process in the process group of the caller.
+If
+.Fa wpid
+is greater than zero, the call waits for the process with process id
+.Fa wpid .
+If
+.Fa wpid
+is less than -1, the call waits for any process whose process group id
+equals the absolute value of
+.Fa wpid .
+.Pp
+The
+.Fa status
+argument is defined below.
+.Pp
+The
+.Fa options
+argument contains the bitwise OR of any of the following options.
+The
+.Dv WCONTINUED
+option indicates that children of the current process that
+have continued from a job control stop, by receiving a
+.Dv SIGCONT
+signal, should also have their status reported.
+The
+.Dv WNOHANG
+option
+is used to indicate that the call should not block if
+there are no processes that wish to report status.
+If the
+.Dv WUNTRACED
+option is set,
+children of the current process that are stopped
+due to a
+.Dv SIGTTIN , SIGTTOU , SIGTSTP ,
+or
+.Dv SIGSTOP
+signal also have their status reported.
+The
+.Dv WSTOPPED
+option is an alias for
+.Dv WUNTRACED .
+The
+.Dv WNOWAIT
+option keeps the process whose status is returned in a waitable state.
+The process may be waited for again after this call completes.
+.Pp
+If
+.Fa rusage
+is non-zero, a summary of the resources used by the terminated
+process and all its
+children is returned (this information is currently not available
+for stopped or continued processes).
+.Pp
+When the
+.Dv WNOHANG
+option is specified and no processes
+wish to report status,
+.Fn wait4
+returns a
+process id
+of 0.
+.Pp
+The
+.Fn waitpid
+function is identical to
+.Fn wait4
+with an
+.Fa rusage
+value of zero.
+The older
+.Fn wait3
+call is the same as
+.Fn wait4
+with a
+.Fa wpid
+value of -1.
+.Pp
+The following macros may be used to test the manner of exit of the process.
+One of the first three macros will evaluate to a non-zero (true) value:
+.Bl -tag -width Ds
+.It Fn WIFCONTINUED status
+True if the process has not terminated, and
+has continued after a job control stop.
+This macro can be true only if the wait call specified the
+.Dv WCONTINUED
+option).
+.It Fn WIFEXITED status
+True if the process terminated normally by a call to
+.Xr _exit 2
+or
+.Xr exit 3 .
+.It Fn WIFSIGNALED status
+True if the process terminated due to receipt of a signal.
+.It Fn WIFSTOPPED status
+True if the process has not terminated, but has stopped and can be restarted.
+This macro can be true only if the wait call specified the
+.Dv WUNTRACED
+option
+or if the child process is being traced (see
+.Xr ptrace 2 ) .
+.El
+.Pp
+Depending on the values of those macros, the following macros
+produce the remaining status information about the child process:
+.Bl -tag -width Ds
+.It Fn WEXITSTATUS status
+If
+.Fn WIFEXITED status
+is true, evaluates to the low-order 8 bits
+of the argument passed to
+.Xr _exit 2
+or
+.Xr exit 3
+by the child.
+.It Fn WTERMSIG status
+If
+.Fn WIFSIGNALED status
+is true, evaluates to the number of the signal
+that caused the termination of the process.
+.It Fn WCOREDUMP status
+If
+.Fn WIFSIGNALED status
+is true, evaluates as true if the termination
+of the process was accompanied by the creation of a core file
+containing an image of the process when the signal was received.
+.It Fn WSTOPSIG status
+If
+.Fn WIFSTOPPED status
+is true, evaluates to the number of the signal
+that caused the process to stop.
+.El
+.Sh NOTES
+See
+.Xr sigaction 2
+for a list of termination signals.
+A status of 0 indicates normal termination.
+.Pp
+If a parent process terminates without
+waiting for all of its child processes to terminate,
+the remaining child processes are assigned the parent
+process 1 ID (the init process ID).
+.Pp
+If a signal is caught while any of the
+.Fn wait
+calls are pending,
+the call may be interrupted or restarted when the signal-catching routine
+returns,
+depending on the options in effect for the signal;
+see discussion of
+.Dv SA_RESTART
+in
+.Xr sigaction 2 .
+.Pp
+The implementation queues one
+.Dv SIGCHLD
+signal for each child process whose
+status has changed, if
+.Fn wait
+returns because the status of a child process is available, the pending
+SIGCHLD signal associated with the process ID of the child process will
+be discarded.
+Any other pending
+.Dv SIGCHLD
+signals remain pending.
+.Pp
+If
+.Dv SIGCHLD
+is blocked,
+.Fn wait
+returns because the status of a child process is available, the pending
+.Dv SIGCHLD
+signal will be cleared unless another status of the child process
+is available.
+.Sh RETURN VALUES
+If
+.Fn wait
+returns due to a stopped, continued,
+or terminated child process, the process ID of the child
+is returned to the calling process.
+Otherwise, a value of \-1
+is returned and
+.Va errno
+is set to indicate the error.
+.Pp
+If
+.Fn wait4 ,
+.Fn wait3 ,
+or
+.Fn waitpid
+returns due to a stopped, continued,
+or terminated child process, the process ID of the child
+is returned to the calling process.
+If there are no children not previously awaited,
+-1 is returned with
+.Va errno
+set to
+.Er ECHILD .
+Otherwise, if
+.Dv WNOHANG
+is specified and there are
+no stopped, continued or exited children,
+0 is returned.
+If an error is detected or a caught signal aborts the call,
+a value of -1
+is returned and
+.Va errno
+is set to indicate the error.
+.Sh ERRORS
+The
+.Fn wait
+function
+will fail and return immediately if:
+.Bl -tag -width Er
+.It Bq Er ECHILD
+The calling process has no existing unwaited-for
+child processes.
+.It Bq Er ECHILD
+No status from the terminated child process is available
+because the calling process has asked the system to discard
+such status by ignoring the signal
+.Dv SIGCHLD
+or setting the flag
+.Dv SA_NOCLDWAIT
+for that signal.
+.It Bq Er EFAULT
+The
+.Fa status
+or
+.Fa rusage
+argument points to an illegal address.
+(May not be detected before exit of a child process.)
+.It Bq Er EINTR
+The call was interrupted by a caught signal,
+or the signal did not have the
+.Dv SA_RESTART
+flag set.
+.El
+.Sh SEE ALSO
+.Xr _exit 2 ,
+.Xr ptrace 2 ,
+.Xr sigaction 2 ,
+.Xr exit 3 ,
+.Xr siginfo 3
+.Sh STANDARDS
+The
+.Fn wait
+and
+.Fn waitpid
+functions are defined by POSIX;
+.Fn wait4
+and
+.Fn wait3
+are not specified by POSIX.
+The
+.Fn WCOREDUMP
+macro
+and the ability to restart a pending
+.Fn wait
+call are extensions to the POSIX interface.
+.Sh HISTORY
+The
+.Fn wait
+function appeared in
+.At v6 .
diff --git a/lib/libc/sys/write.2 b/lib/libc/sys/write.2
new file mode 100644
index 0000000..6d60835
--- /dev/null
+++ b/lib/libc/sys/write.2
@@ -0,0 +1,286 @@
+.\" Copyright (c) 1980, 1991, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"     @(#)write.2	8.5 (Berkeley) 4/2/94
+.\" $FreeBSD$
+.\"
+.Dd July 7, 2005
+.Dt WRITE 2
+.Os
+.Sh NAME
+.Nm write ,
+.Nm writev ,
+.Nm pwrite ,
+.Nm pwritev
+.Nd write output
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In sys/types.h
+.In sys/uio.h
+.In unistd.h
+.Ft ssize_t
+.Fn write "int d" "const void *buf" "size_t nbytes"
+.Ft ssize_t
+.Fn pwrite "int d" "const void *buf" "size_t nbytes" "off_t offset"
+.Ft ssize_t
+.Fn writev "int d" "const struct iovec *iov" "int iovcnt"
+.Ft ssize_t
+.Fn pwritev "int d" "const struct iovec *iov" "int iovcnt" "off_t offset"
+.Sh DESCRIPTION
+The
+.Fn write
+system call
+attempts to write
+.Fa nbytes
+of data to the object referenced by the descriptor
+.Fa d
+from the buffer pointed to by
+.Fa buf .
+The
+.Fn writev
+system call
+performs the same action, but gathers the output data
+from the
+.Fa iovcnt
+buffers specified by the members of the
+.Fa iov
+array: iov[0], iov[1], ..., iov[iovcnt\|-\|1].
+The
+.Fn pwrite
+and
+.Fn pwritev
+system calls
+perform the same functions, but write to the specified position in
+the file without modifying the file pointer.
+.Pp
+For
+.Fn writev
+and
+.Fn pwritev ,
+the
+.Fa iovec
+structure is defined as:
+.Pp
+.Bd -literal -offset indent -compact
+struct iovec {
+	void   *iov_base;  /* Base address. */
+	size_t iov_len;    /* Length. */
+};
+.Ed
+.Pp
+Each
+.Fa iovec
+entry specifies the base address and length of an area
+in memory from which data should be written.
+The
+.Fn writev
+system call
+will always write a complete area before proceeding
+to the next.
+.Pp
+On objects capable of seeking, the
+.Fn write
+starts at a position
+given by the pointer associated with
+.Fa d ,
+see
+.Xr lseek 2 .
+Upon return from
+.Fn write ,
+the pointer is incremented by the number of bytes which were written.
+.Pp
+Objects that are not capable of seeking always write from the current
+position.
+The value of the pointer associated with such an object
+is undefined.
+.Pp
+If the real user is not the super-user, then
+.Fn write
+clears the set-user-id bit on a file.
+This prevents penetration of system security
+by a user who
+.Dq captures
+a writable set-user-id file
+owned by the super-user.
+.Pp
+When using non-blocking I/O on objects such as sockets that are subject
+to flow control,
+.Fn write
+and
+.Fn writev
+may write fewer bytes than requested;
+the return value must be noted,
+and the remainder of the operation should be retried when possible.
+.Sh RETURN VALUES
+Upon successful completion the number of bytes which were written
+is returned.
+Otherwise a -1 is returned and the global variable
+.Va errno
+is set to indicate the error.
+.Sh ERRORS
+The
+.Fn write ,
+.Fn writev ,
+.Fn pwrite
+and
+.Fn pwritev
+system calls
+will fail and the file pointer will remain unchanged if:
+.Bl -tag -width Er
+.It Bq Er EBADF
+The
+.Fa d
+argument
+is not a valid descriptor open for writing.
+.It Bq Er EPIPE
+An attempt is made to write to a pipe that is not open
+for reading by any process.
+.It Bq Er EPIPE
+An attempt is made to write to a socket of type
+.Dv SOCK_STREAM
+that is not connected to a peer socket.
+.It Bq Er EFBIG
+An attempt was made to write a file that exceeds the process's
+file size limit or the maximum file size.
+.It Bq Er EFAULT
+Part of
+.Fa iov
+or data to be written to the file
+points outside the process's allocated address space.
+.It Bq Er EINVAL
+The pointer associated with
+.Fa d
+was negative.
+.It Bq Er ENOSPC
+There is no free space remaining on the file system
+containing the file.
+.It Bq Er EDQUOT
+The user's quota of disk blocks on the file system
+containing the file has been exhausted.
+.It Bq Er EIO
+An I/O error occurred while reading from or writing to the file system.
+.It Bq Er EINTR
+A signal interrupted the write before it could be completed.
+.It Bq Er EAGAIN
+The file was marked for non-blocking I/O,
+and no data could be written immediately.
+.It Bq Er EROFS
+An attempt was made to write over a disk label area at the beginning
+of a slice.
+Use
+.Xr disklabel 8
+.Fl W
+to enable writing on the disk label area.
+.It Bq Er EINVAL
+The value
+.Fa nbytes
+is greater than
+.Dv INT_MAX .
+.El
+.Pp
+In addition,
+.Fn writev
+and
+.Fn pwritev
+may return one of the following errors:
+.Bl -tag -width Er
+.It Bq Er EDESTADDRREQ
+The destination is no longer available when writing to a
+.Ux
+domain datagram socket on which
+.Xr connect 2
+had been used to set a destination address.
+.It Bq Er EINVAL
+The
+.Fa iovcnt
+argument
+was less than or equal to 0, or greater than
+.Dv IOV_MAX .
+.It Bq Er EINVAL
+One of the
+.Fa iov_len
+values in the
+.Fa iov
+array was negative.
+.It Bq Er EINVAL
+The sum of the
+.Fa iov_len
+values in the
+.Fa iov
+array overflowed a 32-bit integer.
+.It Bq Er ENOBUFS
+The mbuf pool has been completely exhausted when writing to a socket.
+.El
+.Pp
+The
+.Fn pwrite
+and
+.Fn pwritev
+system calls may also return the following errors:
+.Bl -tag -width Er
+.It Bq Er EINVAL
+The
+.Fa offset
+value was negative.
+.It Bq Er ESPIPE
+The file descriptor is associated with a pipe, socket, or FIFO.
+.El
+.Sh SEE ALSO
+.Xr fcntl 2 ,
+.Xr lseek 2 ,
+.Xr open 2 ,
+.Xr pipe 2 ,
+.Xr select 2
+.Sh STANDARDS
+The
+.Fn write
+system call is expected to conform to
+.St -p1003.1-90 .
+The
+.Fn writev
+and
+.Fn pwrite
+system calls are expected to conform to
+.St -xpg4.2 .
+.Sh HISTORY
+The
+.Fn pwritev
+system call appeared in
+.Fx 6.0 .
+The
+.Fn pwrite
+function appeared in
+.At V.4 .
+The
+.Fn writev
+system call appeared in
+.Bx 4.2 .
+The
+.Fn write
+function appeared in
+.At v6 .