Fix known issues which blow up the process after dlopen("libthr.so")

(or loading a dso linked to libthr.so into process which was not
linked against threading library).

MFC r276630:
Remove interposing, fix malloc, reinstall signal handlers wrappers on
libthr load.

MFC r276681:
Avoid calling internal libc function through PLT or accessing data
though GOT.

MFC r277032:
Reduce the size of the interposing table and amount of
cancellation-handling code in the libthr.

MFC note:
r276646 ("do not erronously export 'openat' symbol from rtld") is not
applicable to stable/10 yet, since PATHFDS support was not merged.

63 files changed, 2220 insertions, 627 deletions

diff --git a/lib/libc/Makefile b/lib/libc/Makefile
index d567966..6575f6b 100644
--- a/lib/libc/Makefile
+++ b/lib/libc/Makefile
@@ -156,6 +156,10 @@ libkern.${LIBC_ARCH}:: ${KMSRCS}
 	cp -p ${.ALLSRC} ${DESTDIR}/sys/libkern/${LIBC_ARCH}
 .endif
 
+.if !defined(WITHOUT_SYSCALL_COMPAT)
+CFLAGS+=-DSYSCALL_COMPAT
+.endif
+
 .include <bsd.lib.mk>
 
 # Disable warnings in contributed sources.
diff --git a/lib/libc/compat-43/creat.c b/lib/libc/compat-43/creat.c
index fc3be06..4545482 100644
--- a/lib/libc/compat-43/creat.c
+++ b/lib/libc/compat-43/creat.c
@@ -36,11 +36,18 @@ __FBSDID("$FreeBSD$");
 #include "namespace.h"
 #include <fcntl.h>
 #include "un-namespace.h"
+#include "libc_private.h"
 
+__weak_reference(__creat, creat);
+__weak_reference(__creat, _creat);
+
+#pragma weak creat
 int
 __creat(const char *path, mode_t mode)
 {
-	return(_open(path, O_WRONLY|O_CREAT|O_TRUNC, mode));
+
+	return (((int (*)(int, const char *, int, ...))
+	    __libc_interposing[INTERPOS_openat])(AT_FDCWD, path, O_WRONLY |
+	    O_CREAT | O_TRUNC, mode));
 }
-__weak_reference(__creat, creat);
-__weak_reference(__creat, _creat);
+
diff --git a/lib/libc/gen/Makefile.inc b/lib/libc/gen/Makefile.inc
index 1b5222e..9bbf049 100644
--- a/lib/libc/gen/Makefile.inc
+++ b/lib/libc/gen/Makefile.inc
@@ -5,6 +5,7 @@
 .PATH: ${.CURDIR}/${LIBC_ARCH}/gen ${.CURDIR}/gen
 
 SRCS+=	__getosreldate.c \
+	__pthread_mutex_init_calloc_cb_stub.c \
 	__xuname.c \
 	_once_stub.c \
 	_pthread_stubs.c \
diff --git a/lib/libc/gen/Symbol.map b/lib/libc/gen/Symbol.map
index 5b20ebd..8dd9a05 100644
--- a/lib/libc/gen/Symbol.map
+++ b/lib/libc/gen/Symbol.map
@@ -529,6 +529,8 @@ FBSDprivate_1.0 {
 	_libc_sem_post_compat;
 	_libc_sem_getvalue_compat;
 
+	__libc_tcdrain;
+
 	__elf_aux_vector;
 	__pthread_map_stacks_exec;
 	__fillcontextx;
diff --git a/lib/libc/gen/__pthread_mutex_init_calloc_cb_stub.c b/lib/libc/gen/__pthread_mutex_init_calloc_cb_stub.c
new file mode 100644
index 0000000..1c566ec
--- /dev/null
+++ b/lib/libc/gen/__pthread_mutex_init_calloc_cb_stub.c
@@ -0,0 +1,45 @@
+/*
+ * Copyright (c) 2014 The FreeBSD Foundation.
+ * All rights reserved.
+ *
+ * Portions of this software were developed by Konstantin Belousov
+ * under sponsorship from the FreeBSD Foundation.
+ *
+ * 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.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <pthread.h>
+#include "libc_private.h"
+
+int
+_pthread_mutex_init_calloc_cb_stub(pthread_mutex_t *mutex,
+    void *(calloc_cb)(size_t, size_t))
+{
+
+	return (0);
+}
diff --git a/lib/libc/gen/pause.c b/lib/libc/gen/pause.c
index 51706cf..ef48c1c 100644
--- a/lib/libc/gen/pause.c
+++ b/lib/libc/gen/pause.c
@@ -33,10 +33,10 @@ static char sccsid[] = "@(#)pause.c	8.1 (Berkeley) 6/4/93";
 #include <sys/cdefs.h>
 __FBSDID("$FreeBSD$");
 
-#include "namespace.h"
 #include <signal.h>
 #include <unistd.h>
-#include "un-namespace.h"
+
+#include "libc_private.h"
 
 /*
  * Backwards compatible pause.
@@ -46,9 +46,10 @@ __pause(void)
 {
 	sigset_t oset;
 
-	if (_sigprocmask(SIG_BLOCK, NULL, &oset) == -1)
+	if (sigprocmask(SIG_BLOCK, NULL, &oset) == -1)
 		return (-1);
-	return (_sigsuspend(&oset));
+	return (sigsuspend(&oset));
 }
+
 __weak_reference(__pause, pause);
 __weak_reference(__pause, _pause);
diff --git a/lib/libc/gen/raise.c b/lib/libc/gen/raise.c
index b3d0aae..994fea5 100644
--- a/lib/libc/gen/raise.c
+++ b/lib/libc/gen/raise.c
@@ -36,11 +36,17 @@ __FBSDID("$FreeBSD$");
 #include <signal.h>
 #include <unistd.h>
 
+#include "libc_private.h"
+
 __weak_reference(__raise, raise);
 __weak_reference(__raise, _raise);
 
 int
 __raise(int s)
 {
-	return(kill(getpid(), s));
+	long id;
+
+	if (__sys_thr_self(&id) == -1)
+		return (-1);
+	return (__sys_thr_kill(id, s));
 }
diff --git a/lib/libc/gen/sleep.c b/lib/libc/gen/sleep.c
index b807c2d..6bb4ecd 100644
--- a/lib/libc/gen/sleep.c
+++ b/lib/libc/gen/sleep.c
@@ -40,6 +40,8 @@ __FBSDID("$FreeBSD$");
 #include <unistd.h>
 #include "un-namespace.h"
 
+#include "libc_private.h"
+
 unsigned int
 __sleep(unsigned int seconds)
 {
@@ -55,12 +57,14 @@ __sleep(unsigned int seconds)
 
 	time_to_sleep.tv_sec = seconds;
 	time_to_sleep.tv_nsec = 0;
-	if (_nanosleep(&time_to_sleep, &time_remaining) != -1)
+	if (((int (*)(const struct timespec *, struct timespec *))
+	    __libc_interposing[INTERPOS_nanosleep])(
+	    &time_to_sleep, &time_remaining) != -1)
 		return (0);
 	if (errno != EINTR)
 		return (seconds);		/* best guess */
 	return (time_remaining.tv_sec +
-		(time_remaining.tv_nsec != 0)); /* round up */
+	    (time_remaining.tv_nsec != 0)); /* round up */
 }
 
 __weak_reference(__sleep, sleep);
diff --git a/lib/libc/gen/termios.c b/lib/libc/gen/termios.c
index 7e9f169..f8b7354 100644
--- a/lib/libc/gen/termios.c
+++ b/lib/libc/gen/termios.c
@@ -46,6 +46,8 @@ __FBSDID("$FreeBSD$");
 #include <unistd.h>
 #include "un-namespace.h"
 
+#include "libc_private.h"
+
 int
 tcgetattr(int fd, struct termios *t)
 {
@@ -208,13 +210,23 @@ tcsendbreak(int fd, int len __unused)
 }
 
 int
-__tcdrain(int fd)
+__libc_tcdrain(int fd)
 {
+
 	return (_ioctl(fd, TIOCDRAIN, 0));
 }
 
-__weak_reference(__tcdrain, tcdrain);
-__weak_reference(__tcdrain, _tcdrain);
+#pragma weak tcdrain
+int
+tcdrain(int fd)
+{
+
+	return (((int (*)(int))
+	    __libc_interposing[INTERPOS_tcdrain])(fd));
+}
+
+__weak_reference(__libc_tcdrain, __tcdrain);
+__weak_reference(__libc_tcdrain, _tcdrain);
 
 int
 tcflush(int fd, int which)
diff --git a/lib/libc/gen/usleep.c b/lib/libc/gen/usleep.c
index 7d6559b..7c35f6c 100644
--- a/lib/libc/gen/usleep.c
+++ b/lib/libc/gen/usleep.c
@@ -38,6 +38,8 @@ __FBSDID("$FreeBSD$");
 #include <unistd.h>
 #include "un-namespace.h"
 
+#include "libc_private.h"
+
 int
 __usleep(useconds_t useconds)
 {
@@ -45,7 +47,8 @@ __usleep(useconds_t useconds)
 
 	time_to_sleep.tv_nsec = (useconds % 1000000) * 1000;
 	time_to_sleep.tv_sec = useconds / 1000000;
-	return (_nanosleep(&time_to_sleep, NULL));
+	return (((int (*)(const struct timespec *, struct timespec *))
+	    __libc_interposing[INTERPOS_nanosleep])(&time_to_sleep, NULL));
 }
 
 __weak_reference(__usleep, usleep);
diff --git a/lib/libc/gen/wait.c b/lib/libc/gen/wait.c
index 2169b9d..46a3fdd 100644
--- a/lib/libc/gen/wait.c
+++ b/lib/libc/gen/wait.c
@@ -40,10 +40,14 @@ __FBSDID("$FreeBSD$");
 #include <sys/resource.h>
 #include "un-namespace.h"
 
+#include "libc_private.h"
+
 pid_t
 __wait(int *istat)
 {
-	return (_wait4(WAIT_ANY, istat, 0, (struct rusage *)0));
+
+	return (((pid_t (*)(pid_t, int *, int, struct rusage *))
+	    __libc_interposing[INTERPOS_wait4])(WAIT_ANY, istat, 0, NULL));
 }
 
 __weak_reference(__wait, wait);
diff --git a/lib/libc/gen/wait3.c b/lib/libc/gen/wait3.c
index 6098773..965effe 100644
--- a/lib/libc/gen/wait3.c
+++ b/lib/libc/gen/wait3.c
@@ -40,11 +40,14 @@ __FBSDID("$FreeBSD$");
 #include <sys/resource.h>
 #include "un-namespace.h"
 
+#include "libc_private.h"
+
 pid_t
-wait3(istat, options, rup)
-	int *istat;
-	int options;
-	struct rusage *rup;
+__wait3(int *istat, int options, struct rusage *rup)
 {
-	return (_wait4(WAIT_ANY, istat, options, rup));
+
+	return (((pid_t (*)(pid_t, int *, int, struct rusage *))
+	    __libc_interposing[INTERPOS_wait4])(WAIT_ANY, istat, options, rup));
 }
+
+__weak_reference(__wait3, wait3);
diff --git a/lib/libc/gen/waitpid.c b/lib/libc/gen/waitpid.c
index b001837..5177591 100644
--- a/lib/libc/gen/waitpid.c
+++ b/lib/libc/gen/waitpid.c
@@ -40,10 +40,14 @@ __FBSDID("$FreeBSD$");
 #include <sys/resource.h>
 #include "un-namespace.h"
 
+#include "libc_private.h"
+
 pid_t
 __waitpid(pid_t pid, int *istat, int options)
 {
-	return (_wait4(pid, istat, options, (struct rusage *)0));
+
+	return (((pid_t (*)(pid_t, int *, int, struct rusage *))
+	    __libc_interposing[INTERPOS_wait4])(pid, istat, options, NULL));
 }
 
 __weak_reference(__waitpid, waitpid);
diff --git a/lib/libc/include/libc_private.h b/lib/libc/include/libc_private.h
index 40a5f72..347b463 100644
--- a/lib/libc/include/libc_private.h
+++ b/lib/libc/include/libc_private.h
@@ -173,6 +173,52 @@ typedef pthread_func_t pthread_func_entry_t[2];
 
 extern pthread_func_entry_t __thr_jtable[];
 
+void	__set_error_selector(int *(*arg)(void));
+int	_pthread_mutex_init_calloc_cb_stub(pthread_mutex_t *mutex,
+	    void *(calloc_cb)(__size_t, __size_t));
+
+typedef int (*interpos_func_t)(void);
+interpos_func_t *__libc_interposing_slot(int interposno);
+extern interpos_func_t __libc_interposing[] __hidden;
+
+enum {
+	INTERPOS_accept,
+	INTERPOS_accept4,
+	INTERPOS_aio_suspend,
+	INTERPOS_close,
+	INTERPOS_connect,
+	INTERPOS_fcntl,
+	INTERPOS_fsync,
+	INTERPOS_fork,
+	INTERPOS_msync,
+	INTERPOS_nanosleep,
+	INTERPOS_openat,
+	INTERPOS_poll,
+	INTERPOS_pselect,
+	INTERPOS_recvfrom,
+	INTERPOS_recvmsg,
+	INTERPOS_select,
+	INTERPOS_sendmsg,
+	INTERPOS_sendto,
+	INTERPOS_setcontext,
+	INTERPOS_sigaction,
+	INTERPOS_sigprocmask,
+	INTERPOS_sigsuspend,
+	INTERPOS_sigwait,
+	INTERPOS_sigtimedwait,
+	INTERPOS_sigwaitinfo,
+	INTERPOS_swapcontext,
+	INTERPOS_system,
+	INTERPOS_tcdrain,
+	INTERPOS_read,
+	INTERPOS_readv,
+	INTERPOS_wait4,
+	INTERPOS_write,
+	INTERPOS_writev,
+	INTERPOS__pthread_mutex_init_calloc_cb,
+	INTERPOS_MAX
+};
+
 /*
  * yplib internal interfaces
  */
@@ -215,42 +261,101 @@ void _malloc_thread_cleanup(void);
 void _malloc_prefork(void);
 void _malloc_postfork(void);
 
+void _malloc_first_thread(void);
+
 /*
  * Function to clean up streams, called from abort() and exit().
  */
-extern void (*__cleanup)(void) __hidden;
+void (*__cleanup)(void) __hidden;
 
 /*
  * Get kern.osreldate to detect ABI revisions.  Explicitly
  * ignores value of $OSVERSION and caches result.  Prototypes
  * for the wrapped "new" pad-less syscalls are here for now.
  */
-extern int __getosreldate(void);
+int __getosreldate(void);
 #include <sys/_types.h>
-/* Without pad */
-extern __off_t	__sys_lseek(int, __off_t, int);
-extern int	__sys_ftruncate(int, __off_t);
-extern int	__sys_truncate(const char *, __off_t);
-extern __ssize_t __sys_pread(int, void *, __size_t, __off_t);
-extern __ssize_t __sys_pwrite(int, const void *, __size_t, __off_t);
-extern void *	__sys_mmap(void *, __size_t, int, int, int, __off_t);
+#include <sys/_sigset.h>
 
 /* With pad */
-extern __off_t	__sys_freebsd6_lseek(int, int, __off_t, int);
-extern int	__sys_freebsd6_ftruncate(int, int, __off_t);
-extern int	__sys_freebsd6_truncate(const char *, int, __off_t);
-extern __ssize_t __sys_freebsd6_pread(int, void *, __size_t, int, __off_t);
-extern __ssize_t __sys_freebsd6_pwrite(int, const void *, __size_t, int, __off_t);
-extern void *	__sys_freebsd6_mmap(void *, __size_t, int, int, int, int, __off_t);
-
-/* Without back-compat translation */
-extern int	__sys_fcntl(int, int, ...);
+__off_t	__sys_freebsd6_lseek(int, int, __off_t, int);
+int	__sys_freebsd6_ftruncate(int, int, __off_t);
+int	__sys_freebsd6_truncate(const char *, int, __off_t);
+__ssize_t __sys_freebsd6_pread(int, void *, __size_t, int, __off_t);
+__ssize_t __sys_freebsd6_pwrite(int, const void *, __size_t, int, __off_t);
+void *	__sys_freebsd6_mmap(void *, __size_t, int, int, int, int, __off_t);
 
+struct aiocb;
+struct fd_set;
+struct iovec;
+struct msghdr;
+struct pollfd;
+struct rusage;
+struct sigaction;
+struct sockaddr;
 struct timespec;
 struct timeval;
 struct timezone;
-int	__sys_gettimeofday(struct timeval *, struct timezone *);
-int	__sys_clock_gettime(__clockid_t, struct timespec *ts);
+struct __siginfo;
+struct __ucontext;
+int		__sys_aio_suspend(const struct aiocb * const[], int,
+		    const struct timespec *);
+int		__sys_accept(int, struct sockaddr *, __socklen_t *);
+int		__sys_accept4(int, struct sockaddr *, __socklen_t *, int);
+int		__sys_clock_gettime(__clockid_t, struct timespec *ts);
+int		__sys_close(int);
+int		__sys_connect(int, const struct sockaddr *, __socklen_t);
+int		__sys_fcntl(int, int, ...);
+int		__sys_fsync(int);
+__pid_t		__sys_fork(void);
+int		__sys_ftruncate(int, __off_t);
+int		__sys_gettimeofday(struct timeval *, struct timezone *);
+__off_t		__sys_lseek(int, __off_t, int);
+void	       *__sys_mmap(void *, __size_t, int, int, int, __off_t);
+int		__sys_msync(void *, __size_t, int);
+int		__sys_nanosleep(const struct timespec *, struct timespec *);
+int		__sys_open(const char *, int, ...);
+int		__sys_openat(int, const char *, int, ...);
+int		__sys_pselect(int, struct fd_set *, struct fd_set *,
+		    struct fd_set *, const struct timespec *,
+		    const __sigset_t *);
+int		__sys_poll(struct pollfd *, unsigned, int);
+__ssize_t	__sys_pread(int, void *, __size_t, __off_t);
+__ssize_t	__sys_pwrite(int, const void *, __size_t, __off_t);
+__ssize_t	__sys_read(int, void *, __size_t);
+__ssize_t	__sys_readv(int, const struct iovec *, int);
+__ssize_t	__sys_recv(int, void *, __size_t, int);
+__ssize_t	__sys_recvfrom(int, void *, __size_t, int, struct sockaddr *,
+		    __socklen_t *);
+__ssize_t	__sys_recvmsg(int, struct msghdr *, int);
+int		__sys_select(int, struct fd_set *, struct fd_set *,
+		    struct fd_set *, struct timeval *);
+__ssize_t	__sys_sendmsg(int, const struct msghdr *, int);
+__ssize_t	__sys_sendto(int, const void *, __size_t, int,
+		    const struct sockaddr *, __socklen_t);
+int		__sys_setcontext(const struct __ucontext *);
+int		__sys_sigaction(int, const struct sigaction *,
+		    struct sigaction *);
+int		__sys_sigprocmask(int, const __sigset_t *, __sigset_t *);
+int		__sys_sigsuspend(const __sigset_t *);
+int		__sys_sigtimedwait(const __sigset_t *, struct __siginfo *,
+		    const struct timespec *);
+int		__sys_sigwait(const __sigset_t *, int *);
+int		__sys_sigwaitinfo(const __sigset_t *, struct __siginfo *);
+int		__sys_swapcontext(struct __ucontext *,
+		    const struct __ucontext *);
+int		__sys_thr_kill(long, int);
+int		__sys_thr_self(long *);
+int		__sys_truncate(const char *, __off_t);
+__pid_t		__sys_wait4(__pid_t, int *, int, struct rusage *);
+__ssize_t	__sys_write(int, const void *, __size_t);
+__ssize_t	__sys_writev(int, const struct iovec *, int);
+
+int		__libc_sigwait(const __sigset_t * __restrict,
+		    int * restrict sig);
+int		__libc_system(const char *);
+int		__libc_tcdrain(int);
+int		__fcntl_compat(int fd, int cmd, ...);
 
 /* execve() with PATH processing to implement posix_spawnp() */
 int _execvpe(const char *, char * const *, char * const *);
diff --git a/lib/libc/stdlib/Symbol.map b/lib/libc/stdlib/Symbol.map
index 6a1798f..4b8ef5b 100644
--- a/lib/libc/stdlib/Symbol.map
+++ b/lib/libc/stdlib/Symbol.map
@@ -107,4 +107,5 @@ FBSD_1.3 {
 FBSDprivate_1.0 {
 	__system;
 	_system;
+	__libc_system;
 };
diff --git a/lib/libc/stdlib/jemalloc/Symbol.map b/lib/libc/stdlib/jemalloc/Symbol.map
index 617194f..a9a36a8 100644
--- a/lib/libc/stdlib/jemalloc/Symbol.map
+++ b/lib/libc/stdlib/jemalloc/Symbol.map
@@ -43,4 +43,5 @@ FBSDprivate_1.0 {
 	_malloc_thread_cleanup;
 	_malloc_prefork;
 	_malloc_postfork;
+	_malloc_first_thread;
 };
diff --git a/lib/libc/stdlib/system.c b/lib/libc/stdlib/system.c
index e018e6f..bd9ea5a 100644
--- a/lib/libc/stdlib/system.c
+++ b/lib/libc/stdlib/system.c
@@ -46,8 +46,17 @@ __FBSDID("$FreeBSD$");
 #include "un-namespace.h"
 #include "libc_private.h"
 
+#pragma weak system
 int
-__system(const char *command)
+system(const char *command)
+{
+
+	return (((int (*)(const char *))
+	    __libc_interposing[INTERPOS_system])(command));
+}
+
+int
+__libc_system(const char *command)
 {
 	pid_t pid, savedpid;
 	int pstat;
@@ -95,5 +104,5 @@ __system(const char *command)
 	return(pid == -1 ? -1 : pstat);
 }
 
-__weak_reference(__system, system);
-__weak_reference(__system, _system);
+__weak_reference(__libc_system, __system);
+__weak_reference(__libc_system, _system);
diff --git a/lib/libc/sys/Makefile.inc b/lib/libc/sys/Makefile.inc
index b01657f..e6f127d 100644
--- a/lib/libc/sys/Makefile.inc
+++ b/lib/libc/sys/Makefile.inc
@@ -20,17 +20,61 @@ NOASM+=  clock_gettime.o gettimeofday.o
 PSEUDO+= _clock_gettime.o _gettimeofday.o
 
 # Sources common to both syscall interfaces:
-SRCS+=	stack_protector.c stack_protector_compat.c __error.c
+SRCS+=	\
+	stack_protector.c \
+	stack_protector_compat.c \
+	__error.c \
+	interposing_table.c
+
 .if !defined(WITHOUT_SYSCALL_COMPAT)
-SYSCALL_COMPAT_SRCS=	fcntl.c ftruncate.c lseek.c mmap.c pread.c \
-	pwrite.c truncate.c
+SYSCALL_COMPAT_SRCS= \
+	ftruncate.c \
+	lseek.c \
+	mmap.c \
+	pread.c \
+	pwrite.c \
+	truncate.c
 SRCS+=	${SYSCALL_COMPAT_SRCS}
 NOASM+=	${SYSCALL_COMPAT_SRCS:S/.c/.o/}
-PSEUDO+= _fcntl.o
 .endif
-SRCS+= sigwait.c
-NOASM+= sigwait.o
-PSEUDO+= _sigwait.o
+
+INTERPOSED = \
+	accept \
+	accept4 \
+	aio_suspend \
+	close \
+	connect \
+	fcntl \
+	fsync \
+	fork \
+	msync \
+	nanosleep \
+	open \
+	openat \
+	poll \
+	pselect \
+	read \
+	readv \
+	recvfrom \
+	recvmsg \
+	select \
+	sendmsg \
+	sendto \
+	setcontext \
+	sigaction \
+	sigprocmask \
+	sigsuspend \
+	sigtimedwait \
+	sigwait \
+	sigwaitinfo \
+	swapcontext \
+	wait4 \
+	write \
+	writev
+
+SRCS+=	${INTERPOSED:S/$/.c/}
+NOASM+=	${INTERPOSED:S/$/.o/}
+PSEUDO+=	${INTERPOSED:C/^.*$/_&.o/}
 
 # Add machine dependent asm sources:
 SRCS+=${MDASM}
diff --git a/lib/libc/sys/Symbol.map b/lib/libc/sys/Symbol.map
index 448bcce..f1f57ba 100644
--- a/lib/libc/sys/Symbol.map
+++ b/lib/libc/sys/Symbol.map
@@ -245,7 +245,6 @@ FBSD_1.0 {
 	setaudit;
 	setaudit_addr;
 	setauid;
-	setcontext;
 	setegid;
 	seteuid;
 	setgid;
@@ -286,7 +285,6 @@ FBSD_1.0 {
 	__stack_chk_guard;
 	stat;
 	statfs;
-	swapcontext;
 	swapoff;
 	swapon;
 	symlink;
@@ -351,7 +349,6 @@ FBSD_1.1 {
 	mkfifoat;
 	mknodat;
 	msgctl;
-	openat;
 	readlinkat;
 	renameat;
 	setfib;
@@ -1048,7 +1045,9 @@ FBSDprivate_1.0 {
 	__sys_write;
 	_writev;
 	__sys_writev;
-	__error_unthreaded;
+	__set_error_selector;
 	nlm_syscall;
 	gssd_syscall;
+	__libc_interposing_slot;
+	__libc_sigwait;
 };
diff --git a/lib/libc/sys/__error.c b/lib/libc/sys/__error.c
index c3f59f8..28cc31d 100644
--- a/lib/libc/sys/__error.c
+++ b/lib/libc/sys/__error.c
@@ -32,14 +32,25 @@ __FBSDID("$FreeBSD$");
 
 extern int errno;
 
-/*
- * Declare a weak reference in case the application is not linked
- * with libpthread.
- */
-__weak_reference(__error_unthreaded, __error);
+static int *
+__error_unthreaded(void)
+{
+
+	return (&errno);
+}
+
+static int *(*__error_selector)(void) = __error_unthreaded;
+
+void
+__set_error_selector(int *(*arg)(void))
+{
+
+	__error_selector = arg;
+}
 
 int *
-__error_unthreaded(void)
+__error(void)
 {
-	return(&errno);
+
+	return (__error_selector());
 }
diff --git a/lib/libc/sys/accept.c b/lib/libc/sys/accept.c
new file mode 100644
index 0000000..38e32f2
--- /dev/null
+++ b/lib/libc/sys/accept.c
@@ -0,0 +1,50 @@
+/*
+ * Copyright (c) 2014 The FreeBSD Foundation.
+ * All rights reserved.
+ *
+ * Portions of this software were developed by Konstantin Belousov
+ * under sponsorship from the FreeBSD Foundation.
+ *
+ * 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.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/types.h>
+#include <sys/syscall.h>
+#include <sys/socket.h>
+#include "libc_private.h"
+
+__weak_reference(__sys_accept, __accept);
+
+#pragma weak accept
+int
+accept(int s, struct sockaddr *addr, socklen_t *addrlen)
+{
+
+	return (((int (*)(int, struct sockaddr *, socklen_t *))
+	    __libc_interposing[INTERPOS_accept])(s, addr, addrlen));
+}
diff --git a/lib/libc/sys/accept4.c b/lib/libc/sys/accept4.c
new file mode 100644
index 0000000..2907b04
--- /dev/null
+++ b/lib/libc/sys/accept4.c
@@ -0,0 +1,50 @@
+/*
+ * Copyright (c) 2014 The FreeBSD Foundation.
+ * All rights reserved.
+ *
+ * Portions of this software were developed by Konstantin Belousov
+ * under sponsorship from the FreeBSD Foundation.
+ *
+ * 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.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/types.h>
+#include <sys/syscall.h>
+#include <sys/socket.h>
+#include "libc_private.h"
+
+__weak_reference(__sys_accept4, __accept4);
+
+#pragma weak accept4
+int
+accept4(int s, struct sockaddr *addr, socklen_t *addrlen, int flags)
+{
+
+	return (((int (*)(int, struct sockaddr *, socklen_t *, int))
+	    __libc_interposing[INTERPOS_accept4])(s, addr, addrlen, flags));
+}
diff --git a/lib/libc/sys/aio_suspend.c b/lib/libc/sys/aio_suspend.c
new file mode 100644
index 0000000..020edf8
--- /dev/null
+++ b/lib/libc/sys/aio_suspend.c
@@ -0,0 +1,51 @@
+/*
+ * Copyright (c) 2014 The FreeBSD Foundation.
+ * All rights reserved.
+ *
+ * Portions of this software were developed by Konstantin Belousov
+ * under sponsorship from the FreeBSD Foundation.
+ *
+ * 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.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/types.h>
+#include <sys/aio.h>
+#include "libc_private.h"
+
+__weak_reference(__sys_aio_suspend, __aio_suspend);
+
+#pragma weak aio_suspend
+int
+aio_suspend(const struct aiocb * const iocbs[], int niocb,
+    const struct timespec *timeout)
+{
+
+	return (((int (*)(const struct aiocb * const[], int,
+	    const struct timespec *))
+	    __libc_interposing[INTERPOS_aio_suspend])(iocbs, niocb, timeout));
+}
diff --git a/lib/libc/sys/close.c b/lib/libc/sys/close.c
new file mode 100644
index 0000000..02e74c6
--- /dev/null
+++ b/lib/libc/sys/close.c
@@ -0,0 +1,48 @@
+/*
+ * Copyright (c) 2014 The FreeBSD Foundation.
+ * All rights reserved.
+ *
+ * Portions of this software were developed by Konstantin Belousov
+ * under sponsorship from the FreeBSD Foundation.
+ *
+ * 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.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/types.h>
+#include <sys/fcntl.h>
+#include "libc_private.h"
+
+__weak_reference(__sys_close, __close);
+
+#pragma weak close
+int
+close(int fd)
+{
+
+	return (((int (*)(int))__libc_interposing[INTERPOS_close])(fd));
+}
diff --git a/lib/libc/sys/connect.c b/lib/libc/sys/connect.c
new file mode 100644
index 0000000..7969142
--- /dev/null
+++ b/lib/libc/sys/connect.c
@@ -0,0 +1,50 @@
+/*
+ * Copyright (c) 2014 The FreeBSD Foundation.
+ * All rights reserved.
+ *
+ * Portions of this software were developed by Konstantin Belousov
+ * under sponsorship from the FreeBSD Foundation.
+ *
+ * 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.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/types.h>
+#include <sys/syscall.h>
+#include <sys/socket.h>
+#include "libc_private.h"
+
+__weak_reference(__sys_connect, __connect);
+
+#pragma weak connect
+int
+connect(int s, const struct sockaddr *addr, socklen_t addrlen)
+{
+
+	return (((int (*)(int, const struct sockaddr *, socklen_t))
+	    __libc_interposing[INTERPOS_connect])(s, addr, addrlen));
+}
diff --git a/lib/libc/sys/fcntl.c b/lib/libc/sys/fcntl.c
index 480cc40..4cb887b 100644
--- a/lib/libc/sys/fcntl.c
+++ b/lib/libc/sys/fcntl.c
@@ -34,7 +34,23 @@ __FBSDID("$FreeBSD$");
 #include <sys/syscall.h>
 #include "libc_private.h"
 
-__weak_reference(__fcntl_compat, fcntl);
+#pragma weak fcntl
+int
+fcntl(int fd, int cmd, ...)
+{
+	va_list args;
+	long arg;
+
+	va_start(args, cmd);
+	arg = va_arg(args, long);
+	va_end(args);
+
+	return (((int (*)(int, int, ...))
+	    __libc_interposing[INTERPOS_fcntl])(fd, cmd, arg));
+}
+
+#ifdef SYSCALL_COMPAT
+__weak_reference(__fcntl_compat, __fcntl);
 
 int
 __fcntl_compat(int fd, int cmd, ...)
@@ -87,3 +103,7 @@ __fcntl_compat(int fd, int cmd, ...)
 		return (__sys_fcntl(fd, cmd, arg));
 	}
 }
+#else
+__weak_reference(__sys_fcntl, __fcntl_compat);
+__weak_reference(__sys_fcntl, __fcntl);
+#endif
diff --git a/lib/libc/sys/fork.c b/lib/libc/sys/fork.c
new file mode 100644
index 0000000..695540a
--- /dev/null
+++ b/lib/libc/sys/fork.c
@@ -0,0 +1,48 @@
+/*
+ * Copyright (c) 2014 The FreeBSD Foundation.
+ * All rights reserved.
+ *
+ * Portions of this software were developed by Konstantin Belousov
+ * under sponsorship from the FreeBSD Foundation.
+ *
+ * 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.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/types.h>
+#include <unistd.h>
+#include "libc_private.h"
+
+__weak_reference(__sys_fork, __fork);
+
+#pragma weak fork
+pid_t
+fork(void)
+{
+
+	return (((pid_t (*)(void))__libc_interposing[INTERPOS_fork])());
+}
diff --git a/lib/libc/sys/fsync.c b/lib/libc/sys/fsync.c
new file mode 100644
index 0000000..3fff428
--- /dev/null
+++ b/lib/libc/sys/fsync.c
@@ -0,0 +1,47 @@
+/*
+ * Copyright (c) 2014 The FreeBSD Foundation.
+ * All rights reserved.
+ *
+ * Portions of this software were developed by Konstantin Belousov
+ * under sponsorship from the FreeBSD Foundation.
+ *
+ * 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.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/types.h>
+#include <sys/fcntl.h>
+#include "libc_private.h"
+
+__weak_reference(__sys_fsync, __fsync);
+
+int
+fsync(int fd)
+{
+
+	return (((int (*)(int))__libc_interposing[INTERPOS_fsync])(fd));
+}
diff --git a/lib/libc/sys/interposing_table.c b/lib/libc/sys/interposing_table.c
new file mode 100644
index 0000000..d303779
--- /dev/null
+++ b/lib/libc/sys/interposing_table.c
@@ -0,0 +1,84 @@
+/*
+ * Copyright (c) 2014 The FreeBSD Foundation.
+ * All rights reserved.
+ *
+ * Portions of this software were developed by Konstantin Belousov
+ * under sponsorship from the FreeBSD Foundation.
+ *
+ * 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.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/types.h>
+#include "libc_private.h"
+
+#define	SLOT(a, b) \
+	[INTERPOS_##a] = (interpos_func_t)b
+interpos_func_t __libc_interposing[INTERPOS_MAX] = {
+	SLOT(accept, __sys_accept),
+	SLOT(accept4, __sys_accept4),
+	SLOT(aio_suspend, __sys_aio_suspend),
+	SLOT(close, __sys_close),
+	SLOT(connect, __sys_connect),
+	SLOT(fcntl, __fcntl_compat),
+	SLOT(fsync, __sys_fsync),
+	SLOT(fork, __sys_fork),
+	SLOT(msync, __sys_msync),
+	SLOT(nanosleep, __sys_nanosleep),
+	SLOT(openat, __sys_openat),
+	SLOT(poll, __sys_poll),
+	SLOT(pselect, __sys_pselect),
+	SLOT(read, __sys_read),
+	SLOT(readv, __sys_readv),
+	SLOT(recvfrom, __sys_recvfrom),
+	SLOT(recvmsg, __sys_recvmsg),
+	SLOT(select, __sys_select),
+	SLOT(sendmsg, __sys_sendmsg),
+	SLOT(sendto, __sys_sendto),
+	SLOT(setcontext, __sys_setcontext),
+	SLOT(sigaction, __sys_sigaction),
+	SLOT(sigprocmask, __sys_sigprocmask),
+	SLOT(sigsuspend, __sys_sigsuspend),
+	SLOT(sigwait, __libc_sigwait),
+	SLOT(sigtimedwait, __sys_sigtimedwait),
+	SLOT(sigwaitinfo, __sys_sigwaitinfo),
+	SLOT(swapcontext, __sys_swapcontext),
+	SLOT(system, __libc_system),
+	SLOT(tcdrain, __libc_tcdrain),
+	SLOT(wait4, __sys_wait4),
+	SLOT(write, __sys_write),
+	SLOT(writev, __sys_writev),
+	SLOT(_pthread_mutex_init_calloc_cb, _pthread_mutex_init_calloc_cb_stub),
+};
+#undef SLOT
+
+interpos_func_t *
+__libc_interposing_slot(int interposno)
+{
+
+	return (&__libc_interposing[interposno]);
+}
diff --git a/lib/libc/sys/msync.c b/lib/libc/sys/msync.c
new file mode 100644
index 0000000..3c6879f
--- /dev/null
+++ b/lib/libc/sys/msync.c
@@ -0,0 +1,49 @@
+/*
+ * Copyright (c) 2014 The FreeBSD Foundation.
+ * All rights reserved.
+ *
+ * Portions of this software were developed by Konstantin Belousov
+ * under sponsorship from the FreeBSD Foundation.
+ *
+ * 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.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/types.h>
+#include <sys/fcntl.h>
+#include "libc_private.h"
+
+__weak_reference(__sys_msync, __msync);
+
+#pragma weak msync
+int
+msync(void *addr, size_t len, int flags)
+{
+
+	return (((int (*)(void *, size_t, int))
+	    __libc_interposing[INTERPOS_msync])(addr, len, flags));
+}
diff --git a/lib/libc/sys/nanosleep.c b/lib/libc/sys/nanosleep.c
new file mode 100644
index 0000000..412b05e
--- /dev/null
+++ b/lib/libc/sys/nanosleep.c
@@ -0,0 +1,49 @@
+/*
+ * Copyright (c) 2014 The FreeBSD Foundation.
+ * All rights reserved.
+ *
+ * Portions of this software were developed by Konstantin Belousov
+ * under sponsorship from the FreeBSD Foundation.
+ *
+ * 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.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/types.h>
+#include <time.h>
+#include "libc_private.h"
+
+__weak_reference(__sys_nanosleep, __nanosleep);
+
+#pragma weak nanosleep
+int
+nanosleep(const struct timespec *rqtp, struct timespec *rmtp)
+{
+
+	return (((int (*)(const struct timespec *, struct timespec *))
+	    __libc_interposing[INTERPOS_nanosleep])(rqtp, rmtp));
+}
diff --git a/lib/libc/sys/open.c b/lib/libc/sys/open.c
new file mode 100644
index 0000000..e0273c6
--- /dev/null
+++ b/lib/libc/sys/open.c
@@ -0,0 +1,59 @@
+/*
+ * Copyright (c) 2014 The FreeBSD Foundation.
+ * All rights reserved.
+ *
+ * Portions of this software were developed by Konstantin Belousov
+ * under sponsorship from the FreeBSD Foundation.
+ *
+ * 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.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/types.h>
+#include <sys/fcntl.h>
+#include <stdarg.h>
+#include "libc_private.h"
+
+__weak_reference(__sys_open, __open);
+
+#pragma weak open
+int
+open(const char *path, int flags, ...)
+{
+	va_list ap;
+	int mode;
+
+	if ((flags & O_CREAT) != 0) {
+		va_start(ap, flags);
+		mode = va_arg(ap, int);
+		va_end(ap);
+	} else {
+		mode = 0;
+	}
+	return (((int (*)(int, const char *, int, ...))
+	    __libc_interposing[INTERPOS_openat])(AT_FDCWD, path, flags, mode));
+}
diff --git a/lib/libc/sys/openat.c b/lib/libc/sys/openat.c
new file mode 100644
index 0000000..1bd12ea
--- /dev/null
+++ b/lib/libc/sys/openat.c
@@ -0,0 +1,62 @@
+/*
+ * Copyright (c) 2014 The FreeBSD Foundation.
+ * All rights reserved.
+ *
+ * Portions of this software were developed by Konstantin Belousov
+ * under sponsorship from the FreeBSD Foundation.
+ *
+ * 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.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/types.h>
+#include <sys/fcntl.h>
+#include <stdarg.h>
+#include "libc_private.h"
+
+__weak_reference(__sys_openat, __openat);
+__sym_compat(openat, __impl_openat, FBSD_1.1);
+__weak_reference(openat, __impl_openat);
+__sym_default(openat, openat, FBSD_1.2);
+
+#pragma weak openat
+int
+openat(int fd, const char *path, int flags, ...)
+{
+	va_list ap;
+	int mode;
+
+	if ((flags & O_CREAT) != 0) {
+		va_start(ap, flags);
+		mode = va_arg(ap, int);
+		va_end(ap);
+	} else {
+		mode = 0;
+	}
+	return (((int (*)(int, const char *, int, ...))
+	    __libc_interposing[INTERPOS_openat])(fd, path, flags, mode));
+}
diff --git a/lib/libc/sys/poll.c b/lib/libc/sys/poll.c
new file mode 100644
index 0000000..43c17d2
--- /dev/null
+++ b/lib/libc/sys/poll.c
@@ -0,0 +1,49 @@
+/*
+ * Copyright (c) 2014 The FreeBSD Foundation.
+ * All rights reserved.
+ *
+ * Portions of this software were developed by Konstantin Belousov
+ * under sponsorship from the FreeBSD Foundation.
+ *
+ * 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.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/types.h>
+#include <sys/poll.h>
+#include "libc_private.h"
+
+__weak_reference(__sys_poll, __poll);
+
+#pragma weak poll
+int
+poll(struct pollfd pfd[], nfds_t nfds, int timeout)
+{
+
+	return (((int (*)(struct pollfd *, nfds_t, int))
+	    __libc_interposing[INTERPOS_poll])(pfd, nfds, timeout));
+}
diff --git a/lib/libc/sys/pselect.c b/lib/libc/sys/pselect.c
new file mode 100644
index 0000000..a623a7d
--- /dev/null
+++ b/lib/libc/sys/pselect.c
@@ -0,0 +1,51 @@
+/*
+ * Copyright (c) 2014 The FreeBSD Foundation.
+ * All rights reserved.
+ *
+ * Portions of this software were developed by Konstantin Belousov
+ * under sponsorship from the FreeBSD Foundation.
+ *
+ * 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.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/types.h>
+#include <sys/select.h>
+#include "libc_private.h"
+
+__weak_reference(__sys_pselect, __pselect);
+
+#pragma weak pselect
+int
+pselect(int n, fd_set *rs, fd_set *ws, fd_set *es, const struct timespec *t,
+    const sigset_t *s)
+{
+
+	return (((int (*)(int, fd_set *, fd_set *, fd_set *,
+	    const struct timespec *, const sigset_t *))
+	    __libc_interposing[INTERPOS_pselect])(n, rs, ws, es, t, s));
+}
diff --git a/lib/libc/sys/read.c b/lib/libc/sys/read.c
new file mode 100644
index 0000000..ab30189
--- /dev/null
+++ b/lib/libc/sys/read.c
@@ -0,0 +1,50 @@
+/*
+ * Copyright (c) 2014 The FreeBSD Foundation.
+ * All rights reserved.
+ *
+ * Portions of this software were developed by Konstantin Belousov
+ * under sponsorship from the FreeBSD Foundation.
+ *
+ * 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.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/types.h>
+#include <sys/syscall.h>
+#include <unistd.h>
+#include "libc_private.h"
+
+__weak_reference(__sys_read, __read);
+
+#pragma weak read
+ssize_t
+read(int fd, void *buf, size_t nbytes)
+{
+
+	return (((ssize_t (*)(int, void *, size_t))
+	    __libc_interposing[INTERPOS_read])(fd, buf, nbytes));
+}
diff --git a/lib/libc/sys/readv.c b/lib/libc/sys/readv.c
new file mode 100644
index 0000000..8c82040
--- /dev/null
+++ b/lib/libc/sys/readv.c
@@ -0,0 +1,50 @@
+/*
+ * Copyright (c) 2014 The FreeBSD Foundation.
+ * All rights reserved.
+ *
+ * Portions of this software were developed by Konstantin Belousov
+ * under sponsorship from the FreeBSD Foundation.
+ *
+ * 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.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/types.h>
+#include <sys/syscall.h>
+#include <unistd.h>
+#include "libc_private.h"
+
+__weak_reference(__sys_readv, __readv);
+
+#pragma weak readv
+ssize_t
+readv(int fd, const struct iovec *iov, int iovcnt)
+{
+
+	return (((ssize_t (*)(int, const struct iovec *, int))
+	    __libc_interposing[INTERPOS_readv])(fd, iov, iovcnt));
+}
diff --git a/lib/libc/sys/recvfrom.c b/lib/libc/sys/recvfrom.c
new file mode 100644
index 0000000..aa6ef3f
--- /dev/null
+++ b/lib/libc/sys/recvfrom.c
@@ -0,0 +1,53 @@
+/*
+ * Copyright (c) 2014 The FreeBSD Foundation.
+ * All rights reserved.
+ *
+ * Portions of this software were developed by Konstantin Belousov
+ * under sponsorship from the FreeBSD Foundation.
+ *
+ * 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.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/types.h>
+#include <sys/syscall.h>
+#include <sys/socket.h>
+#include "libc_private.h"
+
+__weak_reference(__sys_recvfrom, __recvfrom);
+
+#pragma weak recvfrom
+ssize_t
+recvfrom(int s, void *buf, size_t len, int flags,
+    struct sockaddr * __restrict from, socklen_t * __restrict fromlen)
+{
+
+	return (((ssize_t (*)(int, void *, size_t, int,
+	    struct sockaddr *, socklen_t *))
+	    __libc_interposing[INTERPOS_recvfrom])(s, buf, len, flags,
+	   from, fromlen));
+}
diff --git a/lib/libc/sys/recvmsg.c b/lib/libc/sys/recvmsg.c
new file mode 100644
index 0000000..282ede9
--- /dev/null
+++ b/lib/libc/sys/recvmsg.c
@@ -0,0 +1,50 @@
+/*
+ * Copyright (c) 2014 The FreeBSD Foundation.
+ * All rights reserved.
+ *
+ * Portions of this software were developed by Konstantin Belousov
+ * under sponsorship from the FreeBSD Foundation.
+ *
+ * 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.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/types.h>
+#include <sys/syscall.h>
+#include <sys/socket.h>
+#include "libc_private.h"
+
+__weak_reference(__sys_recvmsg, __recvmsg);
+
+#pragma weak recvmsg
+ssize_t
+recvmsg(int s, struct msghdr *msg, int flags)
+{
+
+	return (((int (*)(int, struct msghdr *, int))
+	    __libc_interposing[INTERPOS_recvmsg])(s, msg, flags));
+}
diff --git a/lib/libc/sys/select.c b/lib/libc/sys/select.c
new file mode 100644
index 0000000..3990496
--- /dev/null
+++ b/lib/libc/sys/select.c
@@ -0,0 +1,49 @@
+/*
+ * Copyright (c) 2014 The FreeBSD Foundation.
+ * All rights reserved.
+ *
+ * Portions of this software were developed by Konstantin Belousov
+ * under sponsorship from the FreeBSD Foundation.
+ *
+ * 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.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/types.h>
+#include <sys/select.h>
+#include "libc_private.h"
+
+__weak_reference(__sys_select, __select);
+
+#pragma weak select
+int
+select(int n, fd_set *rs, fd_set *ws, fd_set *es, struct timeval *t)
+{
+
+	return (((int (*)(int, fd_set *, fd_set *, fd_set *, struct timeval *))
+	    __libc_interposing[INTERPOS_select])(n, rs, ws, es, t));
+}
diff --git a/lib/libc/sys/sendmsg.c b/lib/libc/sys/sendmsg.c
new file mode 100644
index 0000000..7944643
--- /dev/null
+++ b/lib/libc/sys/sendmsg.c
@@ -0,0 +1,50 @@
+/*
+ * Copyright (c) 2014 The FreeBSD Foundation.
+ * All rights reserved.
+ *
+ * Portions of this software were developed by Konstantin Belousov
+ * under sponsorship from the FreeBSD Foundation.
+ *
+ * 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.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/types.h>
+#include <sys/syscall.h>
+#include <sys/socket.h>
+#include "libc_private.h"
+
+__weak_reference(__sys_sendmsg, __sendmsg);
+
+#pragma weak sendmsg
+ssize_t
+sendmsg(int s, const struct msghdr *msg, int flags)
+{
+
+	return (((int (*)(int, const struct msghdr *, int))
+	    __libc_interposing[INTERPOS_sendmsg])(s, msg, flags));
+}
diff --git a/lib/libc/sys/sendto.c b/lib/libc/sys/sendto.c
new file mode 100644
index 0000000..ecf98ee
--- /dev/null
+++ b/lib/libc/sys/sendto.c
@@ -0,0 +1,53 @@
+/*
+ * Copyright (c) 2014 The FreeBSD Foundation.
+ * All rights reserved.
+ *
+ * Portions of this software were developed by Konstantin Belousov
+ * under sponsorship from the FreeBSD Foundation.
+ *
+ * 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.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/types.h>
+#include <sys/syscall.h>
+#include <sys/socket.h>
+#include "libc_private.h"
+
+__weak_reference(__sys_sendto, __sendto);
+
+#pragma weak sendto
+ssize_t
+sendto(int s, const void *msg, size_t len, int flags,
+    const struct sockaddr *to, socklen_t tolen)
+{
+
+	return (((ssize_t (*)(int, const void *, size_t, int,
+	    const struct sockaddr *, socklen_t))
+	    __libc_interposing[INTERPOS_sendto])(s, msg, len, flags,
+	    to, tolen));
+}
diff --git a/lib/libc/sys/setcontext.c b/lib/libc/sys/setcontext.c
new file mode 100644
index 0000000..31b888f
--- /dev/null
+++ b/lib/libc/sys/setcontext.c
@@ -0,0 +1,52 @@
+/*
+ * Copyright (c) 2014 The FreeBSD Foundation.
+ * All rights reserved.
+ *
+ * Portions of this software were developed by Konstantin Belousov
+ * under sponsorship from the FreeBSD Foundation.
+ *
+ * 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.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/types.h>
+#include <ucontext.h>
+#include "libc_private.h"
+
+__weak_reference(__sys_setcontext, __setcontext);
+__sym_compat(setcontext, __impl_setcontext, FBSD_1.0);
+__weak_reference(setcontext, __impl_setcontext);
+__sym_default(setcontext, setcontext, FBSD_1.2);
+
+#pragma weak setcontext
+int
+setcontext(const ucontext_t *uc)
+{
+
+	return (((int (*)(const ucontext_t *))
+	    __libc_interposing[INTERPOS_setcontext])(uc));
+}
diff --git a/lib/libc/sys/sigaction.c b/lib/libc/sys/sigaction.c
new file mode 100644
index 0000000..7645538
--- /dev/null
+++ b/lib/libc/sys/sigaction.c
@@ -0,0 +1,49 @@
+/*
+ * Copyright (c) 2014 The FreeBSD Foundation.
+ * All rights reserved.
+ *
+ * Portions of this software were developed by Konstantin Belousov
+ * under sponsorship from the FreeBSD Foundation.
+ *
+ * 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.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/types.h>
+#include <signal.h>
+#include "libc_private.h"
+
+__weak_reference(__sys_sigaction, __sigaction);
+
+#pragma weak sigaction
+int
+sigaction(int sig, const struct sigaction *act, struct sigaction *oact)
+{
+
+	return (((int (*)(int, const struct sigaction *, struct sigaction *))
+	    __libc_interposing[INTERPOS_sigaction])(sig, act, oact));
+}
diff --git a/lib/libc/sys/sigprocmask.c b/lib/libc/sys/sigprocmask.c
new file mode 100644
index 0000000..40dba95
--- /dev/null
+++ b/lib/libc/sys/sigprocmask.c
@@ -0,0 +1,49 @@
+/*
+ * Copyright (c) 2014 The FreeBSD Foundation.
+ * All rights reserved.
+ *
+ * Portions of this software were developed by Konstantin Belousov
+ * under sponsorship from the FreeBSD Foundation.
+ *
+ * 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.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/types.h>
+#include <signal.h>
+#include "libc_private.h"
+
+__weak_reference(__sys_sigprocmask, __sigprocmask);
+
+#pragma weak sigprocmask
+int
+sigprocmask(int how, const sigset_t *set, sigset_t *oset)
+{
+
+	return (((int (*)(int, const sigset_t *, sigset_t *))
+	    __libc_interposing[INTERPOS_sigprocmask])(how, set, oset));
+}
diff --git a/lib/libc/sys/sigsuspend.c b/lib/libc/sys/sigsuspend.c
new file mode 100644
index 0000000..6e47368
--- /dev/null
+++ b/lib/libc/sys/sigsuspend.c
@@ -0,0 +1,49 @@
+/*
+ * Copyright (c) 2014 The FreeBSD Foundation.
+ * All rights reserved.
+ *
+ * Portions of this software were developed by Konstantin Belousov
+ * under sponsorship from the FreeBSD Foundation.
+ *
+ * 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.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/types.h>
+#include <signal.h>
+#include "libc_private.h"
+
+__weak_reference(__sys_sigsuspend, __sigsuspend);
+
+#pragma weak sigsuspend
+int
+sigsuspend(const sigset_t *set)
+{
+
+	return (((int (*)(const sigset_t *))
+	    __libc_interposing[INTERPOS_sigsuspend])(set));
+}
diff --git a/lib/libc/sys/sigtimedwait.c b/lib/libc/sys/sigtimedwait.c
new file mode 100644
index 0000000..4e06719
--- /dev/null
+++ b/lib/libc/sys/sigtimedwait.c
@@ -0,0 +1,51 @@
+/*
+ * Copyright (c) 2014 The FreeBSD Foundation.
+ * All rights reserved.
+ *
+ * Portions of this software were developed by Konstantin Belousov
+ * under sponsorship from the FreeBSD Foundation.
+ *
+ * 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.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/types.h>
+#include <signal.h>
+#include "libc_private.h"
+
+__weak_reference(__sys_sigtimedwait, __sigtimedwait);
+
+#pragma weak sigtimedwait
+int
+sigtimedwait(const sigset_t * __restrict set, siginfo_t * __restrict info,
+    const struct timespec * __restrict t)
+{
+
+	return (((int (*)(const sigset_t *, siginfo_t *,
+	    const struct timespec *))
+	    __libc_interposing[INTERPOS_sigtimedwait])(set, info, t));
+}
diff --git a/lib/libc/sys/sigwait.c b/lib/libc/sys/sigwait.c
index 2fdffdd..b21cabd 100644
--- a/lib/libc/sys/sigwait.c
+++ b/lib/libc/sys/sigwait.c
@@ -28,13 +28,21 @@ __FBSDID("$FreeBSD$");
 
 #include <errno.h>
 #include <signal.h>
+#include "libc_private.h"
 
-int __sys_sigwait(const sigset_t * restrict, int * restrict);
+__weak_reference(__libc_sigwait, __sigwait);
 
-__weak_reference(__sigwait, sigwait);
+#pragma weak sigwait
+int
+sigwait(const sigset_t *set, int *sig)
+{
+
+	return (((int (*)(const sigset_t *, int *))
+	    __libc_interposing[INTERPOS_sigwait])(set, sig));
+}
 
 int
-__sigwait(const sigset_t * restrict set, int * restrict sig)
+__libc_sigwait(const sigset_t *set, int *sig)
 {
 	int ret;
 
diff --git a/lib/libc/sys/sigwaitinfo.c b/lib/libc/sys/sigwaitinfo.c
new file mode 100644
index 0000000..b9cdc79
--- /dev/null
+++ b/lib/libc/sys/sigwaitinfo.c
@@ -0,0 +1,49 @@
+/*
+ * Copyright (c) 2014 The FreeBSD Foundation.
+ * All rights reserved.
+ *
+ * Portions of this software were developed by Konstantin Belousov
+ * under sponsorship from the FreeBSD Foundation.
+ *
+ * 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.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/types.h>
+#include <signal.h>
+#include "libc_private.h"
+
+__weak_reference(__sys_sigwaitinfo, __sigwaitinfo);
+
+#pragma weak sigwaitinfo
+int
+sigwaitinfo(const sigset_t * __restrict set, siginfo_t * __restrict info)
+{
+
+	return (((int (*)(const sigset_t *, siginfo_t *))
+	    __libc_interposing[INTERPOS_sigwaitinfo])(set, info));
+}
diff --git a/lib/libc/gen/swapcontext.c b/lib/libc/sys/swapcontext.c
index c34cb23..0a8125e 100644
--- a/lib/libc/gen/swapcontext.c
+++ b/lib/libc/sys/swapcontext.c
@@ -1,7 +1,11 @@
 /*
  * Copyright (c) 2001 Daniel M. Eischen <deischen@freebsd.org>
+ * Copyright (c) 2014 The FreeBSD Foundation.
  * All rights reserved.
  *
+ * Portions of this software were developed by Konstantin Belousov
+ * under sponsorship from the FreeBSD Foundation.
+ *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
@@ -30,26 +34,20 @@ __FBSDID("$FreeBSD$");
 #include <sys/param.h>
 #include <sys/signal.h>
 #include <sys/ucontext.h>
-
 #include <errno.h>
 #include <stddef.h>
+#include "libc_private.h"
 
-__weak_reference(__swapcontext, swapcontext);
+__weak_reference(__sys_swapcontext, __swapcontext);
+__sym_compat(swapcontext, __impl_swapcontext, FBSD_1.0);
+__weak_reference(swapcontext, __impl_swapcontext);
+__sym_default(swapcontext, swapcontext, FBSD_1.2);
 
+#pragma weak swapcontext
 int
-__swapcontext(ucontext_t *oucp, const ucontext_t *ucp)
+swapcontext(ucontext_t *oucp, const ucontext_t *ucp)
 {
-	int ret;
 
-	if ((oucp == NULL) || (ucp == NULL)) {
-		errno = EINVAL;
-		return (-1);
-	}
-	oucp->uc_flags &= ~UCF_SWAPPED;
-	ret = getcontext(oucp);
-	if ((ret == 0) && !(oucp->uc_flags & UCF_SWAPPED)) {
-		oucp->uc_flags |= UCF_SWAPPED;
-		ret = setcontext(ucp);
-	}
-	return (ret);
+	return (((int (*)(ucontext_t *, const ucontext_t *))
+	    __libc_interposing[INTERPOS_swapcontext])(oucp, ucp));
 }
diff --git a/lib/libc/sys/wait4.c b/lib/libc/sys/wait4.c
new file mode 100644
index 0000000..a5dbd0f
--- /dev/null
+++ b/lib/libc/sys/wait4.c
@@ -0,0 +1,49 @@
+/*
+ * Copyright (c) 2014 The FreeBSD Foundation.
+ * All rights reserved.
+ *
+ * Portions of this software were developed by Konstantin Belousov
+ * under sponsorship from the FreeBSD Foundation.
+ *
+ * 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.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/types.h>
+#include <sys/wait.h>
+#include "libc_private.h"
+
+__weak_reference(__sys_wait4, __wait4);
+
+#pragma weak wait4
+pid_t
+wait4(pid_t pid, int *status, int options, struct rusage *ru)
+{
+
+	return (((pid_t (*)(pid_t, int *, int, struct rusage *))
+	    __libc_interposing[INTERPOS_wait4])(pid, status, options, ru));
+}
diff --git a/lib/libc/sys/write.c b/lib/libc/sys/write.c
new file mode 100644
index 0000000..ffb1aa5
--- /dev/null
+++ b/lib/libc/sys/write.c
@@ -0,0 +1,50 @@
+/*
+ * Copyright (c) 2014 The FreeBSD Foundation.
+ * All rights reserved.
+ *
+ * Portions of this software were developed by Konstantin Belousov
+ * under sponsorship from the FreeBSD Foundation.
+ *
+ * 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.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/types.h>
+#include <sys/syscall.h>
+#include <unistd.h>
+#include "libc_private.h"
+
+__weak_reference(__sys_write, __write);
+
+#pragma weak write
+ssize_t
+write(int fd, const void *buf, size_t nbytes)
+{
+
+	return (((ssize_t (*)(int, const void *, size_t))
+	    __libc_interposing[INTERPOS_write])(fd, buf, nbytes));
+}
diff --git a/lib/libc/sys/writev.c b/lib/libc/sys/writev.c
new file mode 100644
index 0000000..6be74b3
--- /dev/null
+++ b/lib/libc/sys/writev.c
@@ -0,0 +1,50 @@
+/*
+ * Copyright (c) 2014 The FreeBSD Foundation.
+ * All rights reserved.
+ *
+ * Portions of this software were developed by Konstantin Belousov
+ * under sponsorship from the FreeBSD Foundation.
+ *
+ * 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.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/types.h>
+#include <sys/syscall.h>
+#include <unistd.h>
+#include "libc_private.h"
+
+__weak_reference(__sys_writev, __writev);
+
+#pragma weak writev
+ssize_t
+writev(int fd, const struct iovec *iov, int iovcnt)
+{
+
+	return (((ssize_t (*)(int, const struct iovec *, int))
+	    __libc_interposing[INTERPOS_writev])(fd, iov, iovcnt));
+}
diff --git a/lib/libthr/Makefile b/lib/libthr/Makefile
index e13256c..05bf941 100644
--- a/lib/libthr/Makefile
+++ b/lib/libthr/Makefile
@@ -40,7 +40,6 @@ MAN=	libthr.3
 
 # enable extra internal consistancy checks
 CFLAGS+=-D_PTHREADS_INVARIANTS
-#CFLAGS+=-g
 
 PRECIOUSLIB=
 
diff --git a/lib/libthr/pthread.map b/lib/libthr/pthread.map
index bbbd930e..0903989 100644
--- a/lib/libthr/pthread.map
+++ b/lib/libthr/pthread.map
@@ -6,22 +6,6 @@
  * Use the same naming scheme as libc.
  */
 FBSD_1.0 {
-	__error;
-	accept;
-	aio_suspend;
-	close;
-	connect;
-	creat;
-	execve;
-	fcntl;
-	fork;
-	fsync;
-	msync;
-	nanosleep;
-	open;
-	pause;
-	poll;
-	pselect;
 	pthread_atfork;
 	pthread_barrier_destroy;
 	pthread_barrier_init;
@@ -139,30 +123,6 @@ FBSD_1.0 {
 	pthread_testcancel;
 	pthread_timedjoin_np;
 	pthread_yield;
-	raise;
-	read;
-	readv;
-	recvfrom;
-	recvmsg;
-	select;
-	sendmsg;
-	sendto;
-	sigaction;
-	sigprocmask;
-	sigsuspend;
-	sigwait;
-	sigwaitinfo;
-	sigtimedwait;
-	sleep;
-	system;
-	tcdrain;
-	usleep;
-	wait;
-	wait3;
-	wait4;
-	waitpid;
-	write;
-	writev;
 };
 
 /*
@@ -170,28 +130,6 @@ FBSD_1.0 {
  * These are not part of our application ABI.
  */
 FBSDprivate_1.0 {
-	___creat;
-	___pause;
-	___pselect;
-	___sigwait;
-	___sleep;
-	___system;
-	___tcdrain;
-	___usleep;
-	___wait;
-	___waitpid;
-	__accept;
-	__accept4;
-	__aio_suspend;
-	__close;
-	__connect;
-	__fcntl;
-	__fsync;
-	__msync;
-	__nanosleep;
-	__open;
-	__openat;
-	__poll;
 	__pthread_cond_timedwait;
 	__pthread_cond_wait;
 	__pthread_cxa_finalize;
@@ -199,21 +137,6 @@ FBSDprivate_1.0 {
 	__pthread_mutex_lock;
 	__pthread_mutex_timedlock;
 	__pthread_mutex_trylock;
-	__read;
-	__readv;
-	__recvfrom;
-	__recvmsg;
-	__select;
-	__sendmsg;
-	__sendto;
-	__sigsuspend;
-	__sigtimedwait;
-	__sigwaitinfo;
-	__wait3;
-	__wait4;
-	__write;
-	__writev;
-	_fork;
 	_pthread_atfork;
 	_pthread_barrier_destroy;
 	_pthread_barrier_init;
@@ -345,18 +268,6 @@ FBSDprivate_1.0 {
 	_pthread_testcancel;
 	_pthread_timedjoin_np;
 	_pthread_yield;
-	_raise;
-	_setcontext;
-	_sigaction;
-	_sigprocmask;
-	_sigsuspend;
-	_sigtimedwait;
-	_sigwait;
-	_sigwaitinfo;
-	_spinlock;
-	_spinlock_debug;
-	_spinunlock;
-	_swapcontext;
 
 	/* Debugger needs these. */
 	_libthr_debug;
@@ -404,12 +315,5 @@ FBSD_1.1 {
 };
 
 FBSD_1.2 {
-	openat;
 	pthread_getthreadid_np;
-	setcontext;
-	swapcontext;
-};
-
-FBSD_1.3 {
-	accept4;
 };
diff --git a/lib/libthr/sys/thr_error.c b/lib/libthr/sys/thr_error.c
index 45295c5..852588a 100644
--- a/lib/libthr/sys/thr_error.c
+++ b/lib/libthr/sys/thr_error.c
@@ -42,8 +42,9 @@
 #undef errno
 extern	int	errno;
 
+__weak_reference(__error_threaded, __error);
 int *
-__error(void)
+__error_threaded(void)
 {
 	struct pthread *curthread;
 
diff --git a/lib/libthr/thread/thr_create.c b/lib/libthr/thread/thr_create.c
index a41b33f..df3509d 100644
--- a/lib/libthr/thread/thr_create.c
+++ b/lib/libthr/thread/thr_create.c
@@ -40,6 +40,7 @@
 #include <pthread_np.h>
 #include "un-namespace.h"
 
+#include "libc_private.h"
 #include "thr_private.h"
 
 static int  create_stack(struct pthread_attr *pattr);
@@ -66,8 +67,11 @@ _pthread_create(pthread_t * thread, const pthread_attr_t * attr,
 	/*
 	 * Tell libc and others now they need lock to protect their data.
 	 */
-	if (_thr_isthreaded() == 0 && _thr_setthreaded(1))
-		return (EAGAIN);
+	if (_thr_isthreaded() == 0) {
+		_malloc_first_thread();
+		if (_thr_setthreaded(1))
+			return (EAGAIN);
+	}
 
 	curthread = _get_curthread();
 	if ((new_thread = _thr_alloc(curthread)) == NULL)
diff --git a/lib/libthr/thread/thr_fork.c b/lib/libthr/thread/thr_fork.c
index fc87688..7dc8ca8 100644
--- a/lib/libthr/thread/thr_fork.c
+++ b/lib/libthr/thread/thr_fork.c
@@ -128,12 +128,10 @@ __pthread_cxa_finalize(struct dl_phdr_info *phdr_info)
 	_thr_sigact_unload(phdr_info);
 }
 
-__weak_reference(_fork, fork);
-
-pid_t _fork(void);
+__weak_reference(__thr_fork, _fork);
 
 pid_t
-_fork(void)
+__thr_fork(void)
 {
 	struct pthread *curthread;
 	struct pthread_atfork *af;
diff --git a/lib/libthr/thread/thr_init.c b/lib/libthr/thread/thr_init.c
index 6d6a532..9a1a67a 100644
--- a/lib/libthr/thread/thr_init.c
+++ b/lib/libthr/thread/thr_init.c
@@ -37,6 +37,7 @@
 #include <sys/types.h>
 #include <sys/signalvar.h>
 #include <sys/ioctl.h>
+#include <sys/link_elf.h>
 #include <sys/resource.h>
 #include <sys/sysctl.h>
 #include <sys/ttycom.h>
@@ -302,7 +303,7 @@ _thread_init_hack(void)
 void
 _libpthread_init(struct pthread *curthread)
 {
-	int fd, first = 0;
+	int fd, first, dlopened;
 
 	/* Check if this function has already been called: */
 	if ((_thr_initial != NULL) && (curthread == NULL))
@@ -316,6 +317,7 @@ _libpthread_init(struct pthread *curthread)
 	if (sizeof(jmp_table) != (sizeof(pthread_func_t) * PJT_MAX * 2))
 		PANIC("Thread jump table not properly initialized");
 	memcpy(__thr_jtable, jmp_table, sizeof(jmp_table));
+	__thr_interpose_libc();
 
 	/*
 	 * Check for the special case of this process running as
@@ -349,7 +351,10 @@ _libpthread_init(struct pthread *curthread)
 		if (curthread == NULL)
 			PANIC("Can't allocate initial thread");
 		init_main_thread(curthread);
+	} else {
+		first = 0;
 	}
+		
 	/*
 	 * Add the thread to the thread list queue.
 	 */
@@ -361,7 +366,8 @@ _libpthread_init(struct pthread *curthread)
 
 	if (first) {
 		_thr_initial = curthread;
-		_thr_signal_init();
+		dlopened = _rtld_is_dlopened(&_thread_autoinit_dummy_decl) != 0;
+		_thr_signal_init(dlopened);
 		if (_thread_event_mask & TD_CREATE)
 			_thr_report_creation(curthread, curthread);
 		/*
diff --git a/lib/libthr/thread/thr_printf.c b/lib/libthr/thread/thr_printf.c
index 7d32ae7..a64b446 100644
--- a/lib/libthr/thread/thr_printf.c
+++ b/lib/libthr/thread/thr_printf.c
@@ -31,6 +31,7 @@
 #include <unistd.h>
 #include <pthread.h>
 
+#include "libc_private.h"
 #include "thr_private.h"
 
 static void	pchar(int fd, char c);
diff --git a/lib/libthr/thread/thr_private.h b/lib/libthr/thread/thr_private.h
index c6651cd..d62de98 100644
--- a/lib/libthr/thread/thr_private.h
+++ b/lib/libthr/thread/thr_private.h
@@ -763,7 +763,7 @@ void	_thr_cancel_leave(struct pthread *, int) __hidden;
 void	_thr_testcancel(struct pthread *) __hidden;
 void	_thr_signal_block(struct pthread *) __hidden;
 void	_thr_signal_unblock(struct pthread *) __hidden;
-void	_thr_signal_init(void) __hidden;
+void	_thr_signal_init(int) __hidden;
 void	_thr_signal_deinit(void) __hidden;
 int	_thr_send_sig(struct pthread *, int sig) __hidden;
 void	_thr_list_init(void) __hidden;
@@ -839,7 +839,6 @@ int     __sys_close(int);
 int	__sys_fork(void);
 pid_t	__sys_getpid(void);
 ssize_t __sys_read(int, void *, size_t);
-ssize_t __sys_write(int, const void *, size_t);
 void	__sys_exit(int);
 #endif
 
@@ -906,12 +905,29 @@ int	_sleepq_remove(struct sleepqueue *, struct pthread *) __hidden;
 void	_sleepq_drop(struct sleepqueue *,
 		void (*cb)(struct pthread *, void *arg), void *) __hidden;
 
+int	_pthread_mutex_init_calloc_cb(pthread_mutex_t *mutex,
+	    void *(calloc_cb)(size_t, size_t));
+
 struct dl_phdr_info;
 void __pthread_cxa_finalize(struct dl_phdr_info *phdr_info);
 void _thr_tsd_unload(struct dl_phdr_info *phdr_info) __hidden;
 void _thr_sigact_unload(struct dl_phdr_info *phdr_info) __hidden;
 void _thr_stack_fix_protection(struct pthread *thrd);
 
+int *__error_threaded(void) __hidden;
+void __thr_interpose_libc(void) __hidden;
+pid_t __thr_fork(void);
+int __thr_setcontext(const ucontext_t *ucp);
+int __thr_sigaction(int sig, const struct sigaction *act,
+    struct sigaction *oact) __hidden;
+int __thr_sigprocmask(int how, const sigset_t *set, sigset_t *oset);
+int __thr_sigsuspend(const sigset_t * set);
+int __thr_sigtimedwait(const sigset_t *set, siginfo_t *info,
+    const struct timespec * timeout);
+int __thr_sigwait(const sigset_t *set, int *sig);
+int __thr_sigwaitinfo(const sigset_t *set, siginfo_t *info);
+int __thr_swapcontext(ucontext_t *oucp, const ucontext_t *ucp);
+
 __END_DECLS
 
 #endif  /* !_THR_PRIVATE_H */
diff --git a/lib/libthr/thread/thr_sig.c b/lib/libthr/thread/thr_sig.c
index 57c9406..7cd0f75 100644
--- a/lib/libthr/thread/thr_sig.c
+++ b/lib/libthr/thread/thr_sig.c
@@ -38,6 +38,7 @@
 #include "un-namespace.h"
 #include "libc_private.h"
 
+#include "libc_private.h"
 #include "thr_private.h"
 
 /* #define DEBUG_SIGNAL */
@@ -54,24 +55,23 @@ struct usigaction {
 
 static struct usigaction _thr_sigact[_SIG_MAXSIG];
 
+static inline struct usigaction *
+__libc_sigaction_slot(int signo)
+{
+
+	return (&_thr_sigact[signo - 1]);
+}
+
 static void thr_sighandler(int, siginfo_t *, void *);
 static void handle_signal(struct sigaction *, int, siginfo_t *, ucontext_t *);
 static void check_deferred_signal(struct pthread *);
 static void check_suspend(struct pthread *);
 static void check_cancel(struct pthread *curthread, ucontext_t *ucp);
 
-int	___pause(void);
-int	_raise(int);
-int	__sigtimedwait(const sigset_t *set, siginfo_t *info,
-	const struct timespec * timeout);
 int	_sigtimedwait(const sigset_t *set, siginfo_t *info,
 	const struct timespec * timeout);
-int	__sigwaitinfo(const sigset_t *set, siginfo_t *info);
 int	_sigwaitinfo(const sigset_t *set, siginfo_t *info);
-int	___sigwait(const sigset_t *set, int *sig);
 int	_sigwait(const sigset_t *set, int *sig);
-int	__sigsuspend(const sigset_t *sigmask);
-int	_sigaction(int, const struct sigaction *, struct sigaction *);
 int	_setcontext(const ucontext_t *);
 int	_swapcontext(ucontext_t *, const ucontext_t *);
 
@@ -143,8 +143,8 @@ sigcancel_handler(int sig __unused,
 	errno = err;
 }
 
-typedef void (*ohandler)(int sig, int code,
-	struct sigcontext *scp, char *addr, __sighandler_t *catcher);
+typedef void (*ohandler)(int sig, int code, struct sigcontext *scp,
+    char *addr, __sighandler_t *catcher);
 
 /*
  * The signal handler wrapper is entered with all signal masked.
@@ -152,15 +152,19 @@ typedef void (*ohandler)(int sig, int code,
 static void
 thr_sighandler(int sig, siginfo_t *info, void *_ucp)
 {
-	struct pthread *curthread = _get_curthread();
-	ucontext_t *ucp = _ucp;
+	struct pthread *curthread;
+	ucontext_t *ucp;
 	struct sigaction act;
+	struct usigaction *usa;
 	int err;
 
 	err = errno;
-	_thr_rwl_rdlock(&_thr_sigact[sig-1].lock);
-	act = _thr_sigact[sig-1].sigact;
-	_thr_rwl_unlock(&_thr_sigact[sig-1].lock);
+	curthread = _get_curthread();
+	ucp = _ucp;
+	usa = __libc_sigaction_slot(sig);
+	_thr_rwl_rdlock(&usa->lock);
+	act = usa->sigact;
+	_thr_rwl_unlock(&usa->lock);
 	errno = err;
 	curthread->deferred_run = 0;
 
@@ -234,12 +238,12 @@ handle_signal(struct sigaction *actp, int sig, siginfo_t *info, ucontext_t *ucp)
 	 * so after setjmps() returns once more, the user code may need to
 	 * re-set cancel_enable flag by calling pthread_setcancelstate().
 	 */
-	if ((actp->sa_flags & SA_SIGINFO) != 0)
-		(*(sigfunc))(sig, info, ucp);
-	else {
-		((ohandler)(*sigfunc))(
-			sig, info->si_code, (struct sigcontext *)ucp,
-			info->si_addr, (__sighandler_t *)sigfunc);
+	if ((actp->sa_flags & SA_SIGINFO) != 0) {
+		sigfunc(sig, info, ucp);
+	} else {
+		((ohandler)sigfunc)(sig, info->si_code,
+		    (struct sigcontext *)ucp, info->si_addr,
+		    (__sighandler_t *)sigfunc);
 	}
 	err = errno;
 
@@ -395,9 +399,34 @@ check_suspend(struct pthread *curthread)
 }
 
 void
-_thr_signal_init(void)
+_thr_signal_init(int dlopened)
 {
-	struct sigaction act;
+	struct sigaction act, nact, oact;
+	struct usigaction *usa;
+	sigset_t oldset;
+	int sig, error;
+
+	if (dlopened) {
+		__sys_sigprocmask(SIG_SETMASK, &_thr_maskset, &oldset);
+		for (sig = 1; sig <= _SIG_MAXSIG; sig++) {
+			if (sig == SIGCANCEL)
+				continue;
+			error = __sys_sigaction(sig, NULL, &oact);
+			if (error == -1 || oact.sa_handler == SIG_DFL ||
+			    oact.sa_handler == SIG_IGN)
+				continue;
+			usa = __libc_sigaction_slot(sig);
+			usa->sigact = oact;
+			nact = oact;
+			remove_thr_signals(&usa->sigact.sa_mask);
+			nact.sa_flags &= ~SA_NODEFER;
+			nact.sa_flags |= SA_SIGINFO;
+			nact.sa_sigaction = thr_sighandler;
+			nact.sa_mask = _thr_maskset;
+			(void)__sys_sigaction(sig, &nact, NULL);
+		}
+		__sys_sigprocmask(SIG_SETMASK, &oldset, NULL);
+	}
 
 	/* Install SIGCANCEL handler. */
 	SIGFILLSET(act.sa_mask);
@@ -418,18 +447,20 @@ _thr_sigact_unload(struct dl_phdr_info *phdr_info)
 	struct pthread *curthread = _get_curthread();
 	struct urwlock *rwlp;
 	struct sigaction *actp;
+	struct usigaction *usa;
 	struct sigaction kact;
 	void (*handler)(int);
 	int sig;
  
 	_thr_signal_block(curthread);
 	for (sig = 1; sig <= _SIG_MAXSIG; sig++) {
-		actp = &_thr_sigact[sig-1].sigact;
+		usa = __libc_sigaction_slot(sig);
+		actp = &usa->sigact;
 retry:
 		handler = actp->sa_handler;
 		if (handler != SIG_DFL && handler != SIG_IGN &&
 		    __elf_phdr_match_addr(phdr_info, handler)) {
-			rwlp = &_thr_sigact[sig-1].lock;
+			rwlp = &usa->lock;
 			_thr_rwl_wrlock(rwlp);
 			if (handler != actp->sa_handler) {
 				_thr_rwl_unlock(rwlp);
@@ -455,7 +486,7 @@ _thr_signal_prefork(void)
 	int i;
 
 	for (i = 1; i <= _SIG_MAXSIG; ++i)
-		_thr_rwl_rdlock(&_thr_sigact[i-1].lock);
+		_thr_rwl_rdlock(&__libc_sigaction_slot(i)->lock);
 }
 
 void
@@ -464,7 +495,7 @@ _thr_signal_postfork(void)
 	int i;
 
 	for (i = 1; i <= _SIG_MAXSIG; ++i)
-		_thr_rwl_unlock(&_thr_sigact[i-1].lock);
+		_thr_rwl_unlock(&__libc_sigaction_slot(i)->lock);
 }
 
 void
@@ -472,8 +503,10 @@ _thr_signal_postfork_child(void)
 {
 	int i;
 
-	for (i = 1; i <= _SIG_MAXSIG; ++i)
-		bzero(&_thr_sigact[i-1].lock, sizeof(struct urwlock));
+	for (i = 1; i <= _SIG_MAXSIG; ++i) {
+		bzero(&__libc_sigaction_slot(i) -> lock,
+		    sizeof(struct urwlock));
+	}
 }
 
 void
@@ -481,84 +514,64 @@ _thr_signal_deinit(void)
 {
 }
 
-__weak_reference(___pause, pause);
-
 int
-___pause(void)
-{
-	sigset_t oset;
-
-	if (_sigprocmask(SIG_BLOCK, NULL, &oset) == -1)
-		return (-1);
-	return (__sigsuspend(&oset));
-}
-
-__weak_reference(_raise, raise);
-
-int
-_raise(int sig)
-{
-	return _thr_send_sig(_get_curthread(), sig);
-}
-
-__weak_reference(_sigaction, sigaction);
-
-int
-_sigaction(int sig, const struct sigaction * act, struct sigaction * oact)
+__thr_sigaction(int sig, const struct sigaction *act, struct sigaction *oact)
 {
 	struct sigaction newact, oldact, oldact2;
 	sigset_t oldset;
-	int ret = 0, err = 0;
+	struct usigaction *usa;
+	int ret, err;
 
 	if (!_SIG_VALID(sig) || sig == SIGCANCEL) {
 		errno = EINVAL;
 		return (-1);
 	}
 
-	if (act)
-		newact = *act;
+	ret = 0;
+	err = 0;
+	usa = __libc_sigaction_slot(sig);
 
 	__sys_sigprocmask(SIG_SETMASK, &_thr_maskset, &oldset);
-	_thr_rwl_wrlock(&_thr_sigact[sig-1].lock);
+	_thr_rwl_wrlock(&usa->lock);
  
 	if (act != NULL) {
-		oldact2 = _thr_sigact[sig-1].sigact;
+		oldact2 = usa->sigact;
+		newact = *act;
 
  		/*
 		 * if a new sig handler is SIG_DFL or SIG_IGN,
-		 * don't remove old handler from _thr_sigact[],
+		 * don't remove old handler from __libc_sigact[],
 		 * so deferred signals still can use the handlers,
 		 * multiple threads invoking sigaction itself is
 		 * a race condition, so it is not a problem.
 		 */
 		if (newact.sa_handler != SIG_DFL &&
 		    newact.sa_handler != SIG_IGN) {
-			_thr_sigact[sig-1].sigact = newact;
-			remove_thr_signals(
-				&_thr_sigact[sig-1].sigact.sa_mask);
+			usa->sigact = newact;
+			remove_thr_signals(&usa->sigact.sa_mask);
 			newact.sa_flags &= ~SA_NODEFER;
 			newact.sa_flags |= SA_SIGINFO;
 			newact.sa_sigaction = thr_sighandler;
 			newact.sa_mask = _thr_maskset; /* mask all signals */
 		}
-		if ((ret = __sys_sigaction(sig, &newact, &oldact))) {
+		ret = __sys_sigaction(sig, &newact, &oldact);
+		if (ret == -1) {
 			err = errno;
-			_thr_sigact[sig-1].sigact = oldact2;
+			usa->sigact = oldact2;
 		}
 	} else if (oact != NULL) {
 		ret = __sys_sigaction(sig, NULL, &oldact);
 		err = errno;
 	}
 
-	if (oldact.sa_handler != SIG_DFL &&
-	    oldact.sa_handler != SIG_IGN) {
+	if (oldact.sa_handler != SIG_DFL && oldact.sa_handler != SIG_IGN) {
 		if (act != NULL)
 			oldact = oldact2;
 		else if (oact != NULL)
-			oldact = _thr_sigact[sig-1].sigact;
+			oldact = usa->sigact;
 	}
 
-	_thr_rwl_unlock(&_thr_sigact[sig-1].lock);
+	_thr_rwl_unlock(&usa->lock);
 	__sys_sigprocmask(SIG_SETMASK, &oldset, NULL);
 
 	if (ret == 0) {
@@ -570,10 +583,8 @@ _sigaction(int sig, const struct sigaction * act, struct sigaction * oact)
 	return (ret);
 }
 
-__weak_reference(_sigprocmask, sigprocmask);
-
 int
-_sigprocmask(int how, const sigset_t *set, sigset_t *oset)
+__thr_sigprocmask(int how, const sigset_t *set, sigset_t *oset)
 {
 	const sigset_t *p = set;
 	sigset_t newset;
@@ -598,8 +609,6 @@ _pthread_sigmask(int how, const sigset_t *set, sigset_t *oset)
 	return (0);
 }
 
-__weak_reference(__sigsuspend, sigsuspend);
-
 int
 _sigsuspend(const sigset_t * set)
 {
@@ -609,7 +618,7 @@ _sigsuspend(const sigset_t * set)
 }
 
 int
-__sigsuspend(const sigset_t * set)
+__thr_sigsuspend(const sigset_t * set)
 {
 	struct pthread *curthread;
 	sigset_t newset;
@@ -633,10 +642,6 @@ __sigsuspend(const sigset_t * set)
 	return (ret);
 }
 
-__weak_reference(___sigwait, sigwait);
-__weak_reference(__sigtimedwait, sigtimedwait);
-__weak_reference(__sigwaitinfo, sigwaitinfo);
-
 int
 _sigtimedwait(const sigset_t *set, siginfo_t *info,
 	const struct timespec * timeout)
@@ -653,8 +658,8 @@ _sigtimedwait(const sigset_t *set, siginfo_t *info,
  *   it is not canceled.
  */
 int
-__sigtimedwait(const sigset_t *set, siginfo_t *info,
-	const struct timespec * timeout)
+__thr_sigtimedwait(const sigset_t *set, siginfo_t *info,
+    const struct timespec * timeout)
 {
 	struct pthread	*curthread = _get_curthread();
 	sigset_t newset;
@@ -681,7 +686,7 @@ _sigwaitinfo(const sigset_t *set, siginfo_t *info)
  *   it is not canceled.
  */ 
 int
-__sigwaitinfo(const sigset_t *set, siginfo_t *info)
+__thr_sigwaitinfo(const sigset_t *set, siginfo_t *info)
 {
 	struct pthread	*curthread = _get_curthread();
 	sigset_t newset;
@@ -707,7 +712,7 @@ _sigwait(const sigset_t *set, int *sig)
  *   it is not canceled.
  */ 
 int
-___sigwait(const sigset_t *set, int *sig)
+__thr_sigwait(const sigset_t *set, int *sig)
 {
 	struct pthread	*curthread = _get_curthread();
 	sigset_t newset;
@@ -721,9 +726,8 @@ ___sigwait(const sigset_t *set, int *sig)
 	return (ret);
 }
 
-__weak_reference(_setcontext, setcontext);
 int
-_setcontext(const ucontext_t *ucp)
+__thr_setcontext(const ucontext_t *ucp)
 {
 	ucontext_t uc;
 
@@ -735,12 +739,11 @@ _setcontext(const ucontext_t *ucp)
 		return __sys_setcontext(ucp);
 	(void) memcpy(&uc, ucp, sizeof(uc));
 	SIGDELSET(uc.uc_sigmask, SIGCANCEL);
-	return __sys_setcontext(&uc);
+	return (__sys_setcontext(&uc));
 }
 
-__weak_reference(_swapcontext, swapcontext);
 int
-_swapcontext(ucontext_t *oucp, const ucontext_t *ucp)
+__thr_swapcontext(ucontext_t *oucp, const ucontext_t *ucp)
 {
 	ucontext_t uc;
 
@@ -753,5 +756,5 @@ _swapcontext(ucontext_t *oucp, const ucontext_t *ucp)
 		SIGDELSET(uc.uc_sigmask, SIGCANCEL);
 		ucp = &uc;
 	}
-	return __sys_swapcontext(oucp, ucp);
+	return (__sys_swapcontext(oucp, ucp));
 }
diff --git a/lib/libthr/thread/thr_syscalls.c b/lib/libthr/thread/thr_syscalls.c
index 7a08302..06b63c8 100644
--- a/lib/libthr/thread/thr_syscalls.c
+++ b/lib/libthr/thread/thr_syscalls.c
@@ -1,9 +1,13 @@
 /*
+ * Copyright (c) 2014 The FreeBSD Foundation.
  * Copyright (C) 2005 David Xu <davidxu@freebsd.org>.
  * Copyright (c) 2003 Daniel Eischen <deischen@freebsd.org>.
  * Copyright (C) 2000 Jason Evans <jasone@freebsd.org>.
  * All rights reserved.
  * 
+ * Portions of this software were developed by Konstantin Belousov
+ * under sponsorship from the FreeBSD Foundation.
+ *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
@@ -27,8 +31,6 @@
  * 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.
- *
- * $FreeBSD$
  */
 
 /*
@@ -61,6 +63,9 @@
  *
  */
 
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
 #include "namespace.h"
 #include <sys/types.h>
 #include <sys/mman.h>
@@ -87,85 +92,15 @@
 #include <pthread.h>
 #include "un-namespace.h"
 
+#include "libc_private.h"
 #include "thr_private.h"
 
-extern int	__creat(const char *, mode_t);
-extern int	__pselect(int, fd_set *, fd_set *, fd_set *,
-			const struct timespec *, const sigset_t *);
-extern unsigned	__sleep(unsigned int);
-extern int	__system(const char *);
-extern int	__tcdrain(int);
-extern int	__usleep(useconds_t);
-extern pid_t	__wait(int *);
-extern pid_t	__waitpid(pid_t, int *, int);
-extern int	__sys_aio_suspend(const struct aiocb * const[], int,
-			const struct timespec *);
-extern int	__sys_accept(int, struct sockaddr *, socklen_t *);
-extern int	__sys_accept4(int, struct sockaddr *, socklen_t *, int);
-extern int	__sys_connect(int, const struct sockaddr *, socklen_t);
-extern int	__sys_fsync(int);
-extern int	__sys_msync(void *, size_t, int);
-extern int	__sys_pselect(int, fd_set *, fd_set *, fd_set *,
-			const struct timespec *, const sigset_t *);
-extern int	__sys_poll(struct pollfd *, unsigned, int);
-extern ssize_t	__sys_recv(int, void *, size_t, int);
-extern ssize_t	__sys_recvfrom(int, void *, size_t, int, struct sockaddr *, socklen_t *);
-extern ssize_t	__sys_recvmsg(int, struct msghdr *, int);
-extern int	__sys_select(int, fd_set *, fd_set *, fd_set *, struct timeval *);
-extern int	__sys_sendfile(int, int, off_t, size_t, struct sf_hdtr *,
-			off_t *, int);
-extern ssize_t	__sys_sendmsg(int, const struct msghdr *, int);
-extern ssize_t	__sys_sendto(int, const void *,size_t, int, const struct sockaddr *, socklen_t);
-extern ssize_t	__sys_readv(int, const struct iovec *, int);
-extern pid_t	__sys_wait4(pid_t, int *, int, struct rusage *);
-extern ssize_t	__sys_writev(int, const struct iovec *, int);
-
-int	___creat(const char *, mode_t);
-int	___pselect(int, fd_set *, fd_set *, fd_set *, 
-		const struct timespec *, const sigset_t *);
-unsigned	___sleep(unsigned);
-int	___system(const char *);
-int	___tcdrain(int);
-int	___usleep(useconds_t useconds);
-pid_t	___wait(int *);
-pid_t	___waitpid(pid_t, int *, int);
-int	__accept(int, struct sockaddr *, socklen_t *);
-int	__accept4(int, struct sockaddr *, socklen_t *, int);
-int	__aio_suspend(const struct aiocb * const iocbs[], int,
-		const struct timespec *);
-int	__close(int);
-int	__connect(int, const struct sockaddr *, socklen_t);
-int	__fcntl(int, int,...);
 #ifdef SYSCALL_COMPAT
-extern int __fcntl_compat(int, int,...);
+extern int __fcntl_compat(int, int, ...);
 #endif
-int	__fsync(int);
-int	__msync(void *, size_t, int);
-int	__nanosleep(const struct timespec *, struct timespec *);
-int	__open(const char *, int,...);
-int	__openat(int, const char *, int,...);
-int	__poll(struct pollfd *, unsigned int, int);
-ssize_t	__read(int, void *buf, size_t);
-ssize_t	__readv(int, const struct iovec *, int);
-ssize_t	__recvfrom(int, void *, size_t, int f, struct sockaddr *, socklen_t *);
-ssize_t	__recvmsg(int, struct msghdr *, int);
-int	__select(int, fd_set *, fd_set *, fd_set *, struct timeval *);
-ssize_t	__sendmsg(int, const struct msghdr *, int);
-ssize_t	__sendto(int, const void *, size_t, int,
-		const struct sockaddr *, socklen_t);
-pid_t	__wait3(int *, int, struct rusage *);
-pid_t	__wait4(pid_t, int *, int, struct rusage *);
-ssize_t	__write(int, const void *, size_t);
-ssize_t	__writev(int, const struct iovec *, int);
-
-__weak_reference(__accept, accept);
 
-/*
- * Cancellation behavior:
- *   If thread is canceled, no socket is created.
- */
-int
-__accept(int s, struct sockaddr *addr, socklen_t *addrlen)
+static int
+__thr_accept(int s, struct sockaddr *addr, socklen_t *addrlen)
 {
 	struct pthread *curthread;
 	int ret;
@@ -178,14 +113,12 @@ __accept(int s, struct sockaddr *addr, socklen_t *addrlen)
  	return (ret);
 }
 
-__weak_reference(__accept4, accept4);
-
 /*
  * Cancellation behavior:
  *   If thread is canceled, no socket is created.
  */
-int
-__accept4(int s, struct sockaddr *addr, socklen_t *addrlen, int flags)
+static int
+__thr_accept4(int s, struct sockaddr *addr, socklen_t *addrlen, int flags)
 {
 	struct pthread *curthread;
 	int ret;
@@ -198,15 +131,14 @@ __accept4(int s, struct sockaddr *addr, socklen_t *addrlen, int flags)
  	return (ret);
 }
 
-__weak_reference(__aio_suspend, aio_suspend);
-
-int
-__aio_suspend(const struct aiocb * const iocbs[], int niocb, const struct
+static int
+__thr_aio_suspend(const struct aiocb * const iocbs[], int niocb, const struct
     timespec *timeout)
 {
-	struct pthread *curthread = _get_curthread();
+	struct pthread *curthread;
 	int ret;
 
+	curthread = _get_curthread();
 	_thr_cancel_enter(curthread);
 	ret = __sys_aio_suspend(iocbs, niocb, timeout);
 	_thr_cancel_leave(curthread, 1);
@@ -214,8 +146,6 @@ __aio_suspend(const struct aiocb * const iocbs[], int niocb, const struct
 	return (ret);
 }
 
-__weak_reference(__close, close);
-
 /*
  * Cancellation behavior:
  *   According to manual of close(), the file descriptor is always deleted.
@@ -223,12 +153,13 @@ __weak_reference(__close, close);
  *   descriptor is always deleted despite whether the thread is canceled
  *   or not.
  */
-int
-__close(int fd)
+static int
+__thr_close(int fd)
 {
-	struct pthread	*curthread = _get_curthread();
-	int	ret;
+	struct pthread *curthread;
+	int ret;
 
+	curthread = _get_curthread();
 	_thr_cancel_enter2(curthread, 0);
 	ret = __sys_close(fd);
 	_thr_cancel_leave(curthread, 1);
@@ -236,18 +167,17 @@ __close(int fd)
 	return (ret);
 }
 
-__weak_reference(__connect, connect);
-
 /*
  * Cancellation behavior:
  *   If the thread is canceled, connection is not made.
  */
-int
-__connect(int fd, const struct sockaddr *name, socklen_t namelen)
+static int
+__thr_connect(int fd, const struct sockaddr *name, socklen_t namelen)
 {
-	struct pthread *curthread = _get_curthread();
+	struct pthread *curthread;
 	int ret;
 
+	curthread = _get_curthread();
 	_thr_cancel_enter(curthread);
 	ret = __sys_connect(fd, name, namelen);
 	_thr_cancel_leave(curthread, ret == -1);
@@ -255,27 +185,6 @@ __connect(int fd, const struct sockaddr *name, socklen_t namelen)
  	return (ret);
 }
 
-__weak_reference(___creat, creat);
-
-/*
- * Cancellation behavior:
- *   If thread is canceled, file is not created.
- */
-int
-___creat(const char *path, mode_t mode)
-{
-	struct pthread *curthread = _get_curthread();
-	int ret;
-
-	_thr_cancel_enter(curthread);
-	ret = __creat(path, mode);
-	_thr_cancel_leave(curthread, ret == -1);
-	
-	return ret;
-}
-
-__weak_reference(__fcntl, fcntl);
-
 /*
  * Cancellation behavior:
  *   According to specification, only F_SETLKW is a cancellation point.
@@ -283,13 +192,14 @@ __weak_reference(__fcntl, fcntl);
  *   is failure, this means the function does not generate side effect
  *   if it is canceled.
  */
-int
-__fcntl(int fd, int cmd,...)
+static int
+__thr_fcntl(int fd, int cmd, ...)
 {
-	struct pthread *curthread = _get_curthread();
-	int	ret;
+	struct pthread *curthread;
+	int ret;
 	va_list	ap;
 
+	curthread = _get_curthread();
 	va_start(ap, cmd);
 	if (cmd == F_OSETLKW || cmd == F_SETLKW) {
 		_thr_cancel_enter(curthread);
@@ -311,18 +221,17 @@ __fcntl(int fd, int cmd,...)
 	return (ret);
 }
 
-__weak_reference(__fsync, fsync);
-
 /*
  * Cancellation behavior:
  *   Thread may be canceled after system call.
  */
-int
-__fsync(int fd)
+static int
+__thr_fsync(int fd)
 {
-	struct pthread *curthread = _get_curthread();
-	int	ret;
+	struct pthread *curthread;
+	int ret;
 
+	curthread = _get_curthread();
 	_thr_cancel_enter2(curthread, 0);
 	ret = __sys_fsync(fd);
 	_thr_cancel_leave(curthread, 1);
@@ -330,34 +239,32 @@ __fsync(int fd)
 	return (ret);
 }
 
-__weak_reference(__msync, msync);
-
 /*
  * Cancellation behavior:
  *   Thread may be canceled after system call.
  */
-int
-__msync(void *addr, size_t len, int flags)
+static int
+__thr_msync(void *addr, size_t len, int flags)
 {
-	struct pthread *curthread = _get_curthread();
-	int	ret;
+	struct pthread *curthread;
+	int ret;
 
+	curthread = _get_curthread();
 	_thr_cancel_enter2(curthread, 0);
 	ret = __sys_msync(addr, len, flags);
 	_thr_cancel_leave(curthread, 1);
 
-	return ret;
+	return (ret);
 }
 
-__weak_reference(__nanosleep, nanosleep);
-
-int
-__nanosleep(const struct timespec *time_to_sleep,
+static int
+__thr_nanosleep(const struct timespec *time_to_sleep,
     struct timespec *time_remaining)
 {
-	struct pthread *curthread = _get_curthread();
-	int		ret;
+	struct pthread *curthread;
+	int ret;
 
+	curthread = _get_curthread();
 	_thr_cancel_enter(curthread);
 	ret = __sys_nanosleep(time_to_sleep, time_remaining);
 	_thr_cancel_leave(curthread, 1);
@@ -365,99 +272,68 @@ __nanosleep(const struct timespec *time_to_sleep,
 	return (ret);
 }
 
-__weak_reference(__open, open);
-
-/*
- * Cancellation behavior:
- *   If the thread is canceled, file is not opened.
- */
-int
-__open(const char *path, int flags,...)
-{
-	struct pthread *curthread = _get_curthread();
-	int	ret;
-	int	mode = 0;
-	va_list	ap;
-
-	/* Check if the file is being created: */
-	if (flags & O_CREAT) {
-		/* Get the creation mode: */
-		va_start(ap, flags);
-		mode = va_arg(ap, int);
-		va_end(ap);
-	}
-	
-	_thr_cancel_enter(curthread);
-	ret = __sys_open(path, flags, mode);
-	_thr_cancel_leave(curthread, ret == -1);
-
-	return ret;
-}
-
-__weak_reference(__openat, openat);
-
 /*
  * Cancellation behavior:
  *   If the thread is canceled, file is not opened.
  */
-int
-__openat(int fd, const char *path, int flags, ...)
+static int
+__thr_openat(int fd, const char *path, int flags, ...)
 {
-	struct pthread *curthread = _get_curthread();
-	int	ret;
-	int	mode = 0;
+	struct pthread *curthread;
+	int mode, ret;
 	va_list	ap;
 
 	
 	/* Check if the file is being created: */
-	if (flags & O_CREAT) {
+	if ((flags & O_CREAT) != 0) {
 		/* Get the creation mode: */
 		va_start(ap, flags);
 		mode = va_arg(ap, int);
 		va_end(ap);
+	} else {
+		mode = 0;
 	}
 	
+	curthread = _get_curthread();
 	_thr_cancel_enter(curthread);
 	ret = __sys_openat(fd, path, flags, mode);
 	_thr_cancel_leave(curthread, ret == -1);
 
-	return ret;
+	return (ret);
 }
 
-__weak_reference(__poll, poll);
-
 /*
  * Cancellation behavior:
  *   Thread may be canceled at start, but if the system call returns something,
  *   the thread is not canceled.
  */
-int
-__poll(struct pollfd *fds, unsigned int nfds, int timeout)
+static int
+__thr_poll(struct pollfd *fds, unsigned int nfds, int timeout)
 {
-	struct pthread *curthread = _get_curthread();
+	struct pthread *curthread;
 	int ret;
 
+	curthread = _get_curthread();
 	_thr_cancel_enter(curthread);
 	ret = __sys_poll(fds, nfds, timeout);
 	_thr_cancel_leave(curthread, ret == -1);
 
-	return ret;
+	return (ret);
 }
 
-__weak_reference(___pselect, pselect);
-
 /*
  * Cancellation behavior:
  *   Thread may be canceled at start, but if the system call returns something,
  *   the thread is not canceled.
  */
-int 
-___pselect(int count, fd_set *rfds, fd_set *wfds, fd_set *efds, 
+static int
+__thr_pselect(int count, fd_set *rfds, fd_set *wfds, fd_set *efds, 
 	const struct timespec *timo, const sigset_t *mask)
 {
-	struct pthread *curthread = _get_curthread();
+	struct pthread *curthread;
 	int ret;
 
+	curthread = _get_curthread();
 	_thr_cancel_enter(curthread);
 	ret = __sys_pselect(count, rfds, wfds, efds, timo, mask);
 	_thr_cancel_leave(curthread, ret == -1);
@@ -465,321 +341,264 @@ ___pselect(int count, fd_set *rfds, fd_set *wfds, fd_set *efds,
 	return (ret);
 }
 
-__weak_reference(__read, read);
-
 /*
  * Cancellation behavior:
  *   Thread may be canceled at start, but if the system call got some data, 
  *   the thread is not canceled.
  */
-ssize_t
-__read(int fd, void *buf, size_t nbytes)
+static ssize_t
+__thr_read(int fd, void *buf, size_t nbytes)
 {
-	struct pthread *curthread = _get_curthread();
+	struct pthread *curthread;
 	ssize_t	ret;
 
+	curthread = _get_curthread();
 	_thr_cancel_enter(curthread);
 	ret = __sys_read(fd, buf, nbytes);
 	_thr_cancel_leave(curthread, ret == -1);
 
-	return ret;
+	return (ret);
 }
 
-__weak_reference(__readv, readv);
-
 /*
  * Cancellation behavior:
  *   Thread may be canceled at start, but if the system call got some data, 
  *   the thread is not canceled.
  */
-ssize_t
-__readv(int fd, const struct iovec *iov, int iovcnt)
+static ssize_t
+__thr_readv(int fd, const struct iovec *iov, int iovcnt)
 {
-	struct pthread *curthread = _get_curthread();
+	struct pthread *curthread;
 	ssize_t ret;
 
+	curthread = _get_curthread();
 	_thr_cancel_enter(curthread);
 	ret = __sys_readv(fd, iov, iovcnt);
 	_thr_cancel_leave(curthread, ret == -1);
-	return ret;
+	return (ret);
 }
 
-__weak_reference(__recvfrom, recvfrom);
-
 /*
  * Cancellation behavior:
  *   Thread may be canceled at start, but if the system call got some data, 
  *   the thread is not canceled.
  */
-ssize_t
-__recvfrom(int s, void *b, size_t l, int f, struct sockaddr *from,
+static ssize_t
+__thr_recvfrom(int s, void *b, size_t l, int f, struct sockaddr *from,
     socklen_t *fl)
 {
-	struct pthread *curthread = _get_curthread();
+	struct pthread *curthread;
 	ssize_t ret;
 
+	curthread = _get_curthread();
 	_thr_cancel_enter(curthread);
 	ret = __sys_recvfrom(s, b, l, f, from, fl);
 	_thr_cancel_leave(curthread, ret == -1);
 	return (ret);
 }
 
-__weak_reference(__recvmsg, recvmsg);
-
 /*
  * Cancellation behavior:
  *   Thread may be canceled at start, but if the system call got some data, 
  *   the thread is not canceled.
  */
-ssize_t
-__recvmsg(int s, struct msghdr *m, int f)
+static ssize_t
+__thr_recvmsg(int s, struct msghdr *m, int f)
 {
-	struct pthread *curthread = _get_curthread();
+	struct pthread *curthread;
 	ssize_t ret;
 
+	curthread = _get_curthread();
 	_thr_cancel_enter(curthread);
 	ret = __sys_recvmsg(s, m, f);
 	_thr_cancel_leave(curthread, ret == -1);
 	return (ret);
 }
 
-__weak_reference(__select, select);
-
 /*
  * Cancellation behavior:
  *   Thread may be canceled at start, but if the system call returns something,
  *   the thread is not canceled.
  */
-int 
-__select(int numfds, fd_set *readfds, fd_set *writefds, fd_set *exceptfds,
+static int 
+__thr_select(int numfds, fd_set *readfds, fd_set *writefds, fd_set *exceptfds,
 	struct timeval *timeout)
 {
-	struct pthread *curthread = _get_curthread();
+	struct pthread *curthread;
 	int ret;
 
+	curthread = _get_curthread();
 	_thr_cancel_enter(curthread);
 	ret = __sys_select(numfds, readfds, writefds, exceptfds, timeout);
 	_thr_cancel_leave(curthread, ret == -1);
-	return ret;
+	return (ret);
 }
 
-__weak_reference(__sendmsg, sendmsg);
-
 /*
  * Cancellation behavior:
  *   Thread may be canceled at start, but if the system call sent
  *   data, the thread is not canceled.
  */
-ssize_t
-__sendmsg(int s, const struct msghdr *m, int f)
+static ssize_t
+__thr_sendmsg(int s, const struct msghdr *m, int f)
 {
-	struct pthread *curthread = _get_curthread();
+	struct pthread *curthread;
 	ssize_t ret;
 
+	curthread = _get_curthread();
 	_thr_cancel_enter(curthread);
 	ret = __sys_sendmsg(s, m, f);
 	_thr_cancel_leave(curthread, ret <= 0);
 	return (ret);
 }
 
-__weak_reference(__sendto, sendto);
-
 /*
  * Cancellation behavior:
  *   Thread may be canceled at start, but if the system call sent some
  *   data, the thread is not canceled.
  */
-ssize_t
-__sendto(int s, const void *m, size_t l, int f, const struct sockaddr *t,
+static ssize_t
+__thr_sendto(int s, const void *m, size_t l, int f, const struct sockaddr *t,
     socklen_t tl)
 {
-	struct pthread *curthread = _get_curthread();
+	struct pthread *curthread;
 	ssize_t ret;
 
+	curthread = _get_curthread();
 	_thr_cancel_enter(curthread);
 	ret = __sys_sendto(s, m, l, f, t, tl);
 	_thr_cancel_leave(curthread, ret <= 0);
 	return (ret);
 }
 
-__weak_reference(___sleep, sleep);
-
-unsigned int
-___sleep(unsigned int seconds)
+static int
+__thr_system(const char *string)
 {
-	struct pthread *curthread = _get_curthread();
-	unsigned int	ret;
+	struct pthread *curthread;
+	int ret;
 
+	curthread = _get_curthread();
 	_thr_cancel_enter(curthread);
-	ret = __sleep(seconds);
+	ret = __libc_system(string);
 	_thr_cancel_leave(curthread, 1);
-	
 	return (ret);
 }
 
-__weak_reference(___system, system);
-
-int
-___system(const char *string)
-{
-	struct pthread *curthread = _get_curthread();
-	int	ret;
-
-	_thr_cancel_enter(curthread);
-	ret = __system(string);
-	_thr_cancel_leave(curthread, 1);
-	
-	return ret;
-}
-
-__weak_reference(___tcdrain, tcdrain);
-
 /*
  * Cancellation behavior:
  *   If thread is canceled, the system call is not completed,
  *   this means not all bytes were drained.
  */
-int
-___tcdrain(int fd)
+static int
+__thr_tcdrain(int fd)
 {
-	struct pthread *curthread = _get_curthread();
-	int	ret;
+	struct pthread *curthread;
+	int ret;
 	
+	curthread = _get_curthread();
 	_thr_cancel_enter(curthread);
-	ret = __tcdrain(fd);
+	ret = __libc_tcdrain(fd);
 	_thr_cancel_leave(curthread, ret == -1);
 	return (ret);
 }
 
-__weak_reference(___usleep, usleep);
-
-int
-___usleep(useconds_t useconds)
-{
-	struct pthread *curthread = _get_curthread();
-	int		ret;
-
-	_thr_cancel_enter(curthread);
-	ret = __usleep(useconds);
-	_thr_cancel_leave(curthread, 1);
-	
-	return (ret);
-}
-
-__weak_reference(___wait, wait);
-
 /*
  * Cancellation behavior:
  *   Thread may be canceled at start, but if the system call returns
  *   a child pid, the thread is not canceled.
  */
-pid_t
-___wait(int *istat)
+static pid_t
+__thr_wait4(pid_t pid, int *status, int options, struct rusage *rusage)
 {
-	struct pthread *curthread = _get_curthread();
-	pid_t	ret;
-
-	_thr_cancel_enter(curthread);
-	ret = __wait(istat);
-	_thr_cancel_leave(curthread, ret <= 0);
-
-	return ret;
-}
-
-__weak_reference(__wait3, wait3);
-
-/*
- * Cancellation behavior:
- *   Thread may be canceled at start, but if the system call returns
- *   a child pid, the thread is not canceled.
- */
-pid_t
-__wait3(int *status, int options, struct rusage *rusage)
-{
-	struct pthread *curthread = _get_curthread();
-	pid_t ret;
-
-	_thr_cancel_enter(curthread);
-	ret = _wait4(WAIT_ANY, status, options, rusage);
-	_thr_cancel_leave(curthread, ret <= 0);
-
-	return (ret);
-}
-
-__weak_reference(__wait4, wait4);
-
-/*
- * Cancellation behavior:
- *   Thread may be canceled at start, but if the system call returns
- *   a child pid, the thread is not canceled.
- */
-pid_t
-__wait4(pid_t pid, int *status, int options, struct rusage *rusage)
-{
-	struct pthread *curthread = _get_curthread();
+	struct pthread *curthread;
 	pid_t ret;
 
+	curthread = _get_curthread();
 	_thr_cancel_enter(curthread);
 	ret = __sys_wait4(pid, status, options, rusage);
 	_thr_cancel_leave(curthread, ret <= 0);
-
-	return ret;
-}
-
-__weak_reference(___waitpid, waitpid);
-
-/*
- * Cancellation behavior:
- *   Thread may be canceled at start, but if the system call returns
- *   a child pid, the thread is not canceled.
- */
-pid_t
-___waitpid(pid_t wpid, int *status, int options)
-{
-	struct pthread *curthread = _get_curthread();
-	pid_t	ret;
-
-	_thr_cancel_enter(curthread);
-	ret = __waitpid(wpid, status, options);
-	_thr_cancel_leave(curthread, ret <= 0);
-	
-	return ret;
+	return (ret);
 }
 
-__weak_reference(__write, write);
-
 /*
  * Cancellation behavior:
  *   Thread may be canceled at start, but if the thread wrote some data,
  *   it is not canceled.
  */
-ssize_t
-__write(int fd, const void *buf, size_t nbytes)
+static ssize_t
+__thr_write(int fd, const void *buf, size_t nbytes)
 {
-	struct pthread *curthread = _get_curthread();
+	struct pthread *curthread;
 	ssize_t	ret;
 
+	curthread = _get_curthread();
 	_thr_cancel_enter(curthread);
 	ret = __sys_write(fd, buf, nbytes);
 	_thr_cancel_leave(curthread, (ret <= 0));
-	return ret;
+	return (ret);
 }
 
-__weak_reference(__writev, writev);
-
 /*
  * Cancellation behavior:
  *   Thread may be canceled at start, but if the thread wrote some data,
  *   it is not canceled.
  */
-ssize_t
-__writev(int fd, const struct iovec *iov, int iovcnt)
+static ssize_t
+__thr_writev(int fd, const struct iovec *iov, int iovcnt)
 {
-	struct pthread *curthread = _get_curthread();
+	struct pthread *curthread;
 	ssize_t ret;
 
+	curthread = _get_curthread();
 	_thr_cancel_enter(curthread);
 	ret = __sys_writev(fd, iov, iovcnt);
 	_thr_cancel_leave(curthread, (ret <= 0));
-	return ret;
+	return (ret);
+}
+
+void
+__thr_interpose_libc(void)
+{
+
+	__set_error_selector(__error_threaded);
+#define	SLOT(name)					\
+	*(__libc_interposing_slot(INTERPOS_##name)) =	\
+	    (interpos_func_t)__thr_##name;
+	SLOT(accept);
+	SLOT(accept4);
+	SLOT(aio_suspend);
+	SLOT(close);
+	SLOT(connect);
+	SLOT(fcntl);
+	SLOT(fsync);
+	SLOT(fork);
+	SLOT(msync);
+	SLOT(nanosleep);
+	SLOT(openat);
+	SLOT(poll);
+	SLOT(pselect);
+	SLOT(read);
+	SLOT(readv);
+	SLOT(recvfrom);
+	SLOT(recvmsg);
+	SLOT(select);
+	SLOT(sendmsg);
+	SLOT(sendto);
+	SLOT(setcontext);
+	SLOT(sigaction);
+	SLOT(sigprocmask);
+	SLOT(sigsuspend);
+	SLOT(sigwait);
+	SLOT(sigtimedwait);
+	SLOT(sigwaitinfo);
+	SLOT(swapcontext);
+	SLOT(system);
+	SLOT(tcdrain);
+	SLOT(wait4);
+	SLOT(write);
+	SLOT(writev);
+#undef SLOT
+	*(__libc_interposing_slot(
+	    INTERPOS__pthread_mutex_init_calloc_cb)) =
+	    (interpos_func_t)_pthread_mutex_init_calloc_cb;
 }