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+.\" Copyright (c) 1983, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 3. All advertising materials mentioning features or use of this software
+.\"    must display the following acknowledgement:
+.\"	This product includes software developed by the University of
+.\"	California, Berkeley and its contributors.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"	@(#)a.t	8.1 (Berkeley) 6/8/93
+.\"
+.ds RH Summary of facilities
+.bp
+.SH
+\s+2I.  Summary of facilities\s0
+.PP
+.de h
+.br
+.if n .ne 8
+\fB\\$1 \\$2\fP
+.br
+..
+.nr H1 0
+.NH
+Kernel primitives
+.LP
+.h 1.1. "Process naming and protection
+.in +5
+.TS
+lw(1.6i) aw(3i).
+sethostid	set UNIX host id
+gethostid	get UNIX host id
+sethostname	set UNIX host name
+gethostname	get UNIX host name
+getpid	get process id
+fork	create new process
+exit	terminate a process
+execve	execute a different process
+getuid	get user id
+geteuid	get effective user id
+setreuid	set real and effective user id's
+getgid	get accounting group id
+getegid	get effective accounting group id
+getgroups	get access group set
+setregid	set real and effective group id's
+setgroups	set access group set
+getpgrp	get process group
+setpgrp	set process group
+.TE
+.in -5
+.h 1.2 "Memory management
+.in +5
+.TS
+lw(1.6i) aw(3i).
+<sys/mman.h>	memory management definitions
+sbrk	change data section size
+sstk\(dg	change stack section size
+.FS
+\(dg Not supported in 4.3BSD.
+.FE
+getpagesize	get memory page size
+mmap\(dg	map pages of memory
+msync\(dg	flush modified mapped pages to filesystem
+munmap\(dg	unmap memory
+mprotect\(dg	change protection of pages
+madvise\(dg	give memory management advice
+mincore\(dg	determine core residency of pages
+msleep\(dg	sleep on a lock
+mwakeup\(dg	wakeup process sleeping on a lock
+.TE
+.in -5
+.h 1.3 "Signals
+.in +5
+.TS
+lw(1.6i) aw(3i).
+<signal.h>	signal definitions
+sigvec	set handler for signal
+kill	send signal to process
+killpgrp	send signal to process group
+sigblock	block set of signals
+sigsetmask	restore set of blocked signals
+sigpause	wait for signals
+sigstack	set software stack for signals
+.TE
+.in -5
+.h 1.4 "Timing and statistics
+.in +5
+.TS
+lw(1.6i) aw(3i).
+<sys/time.h>	time-related definitions
+gettimeofday	get current time and timezone
+settimeofday	set current time and timezone
+getitimer	read an interval timer
+setitimer	get and set an interval timer
+profil	profile process
+.TE
+.in -5
+.h 1.5 "Descriptors
+.in +5
+.TS
+lw(1.6i) aw(3i).
+getdtablesize	descriptor reference table size
+dup	duplicate descriptor
+dup2	duplicate to specified index
+close	close descriptor
+select	multiplex input/output
+fcntl	control descriptor options
+wrap\(dg	wrap descriptor with protocol
+.FS
+\(dg Not supported in 4.3BSD.
+.FE
+.TE
+.in -5
+.h 1.6 "Resource controls
+.in +5
+.TS
+lw(1.6i) aw(3i).
+<sys/resource.h>	resource-related definitions
+getpriority	get process priority
+setpriority	set process priority
+getrusage	get resource usage
+getrlimit	get resource limitations
+setrlimit	set resource limitations
+.TE
+.in -5
+.h 1.7 "System operation support
+.in +5
+.TS
+lw(1.6i) aw(3i).
+mount	mount a device file system
+swapon	add a swap device
+umount	umount a file system
+sync	flush system caches
+reboot	reboot a machine
+acct	specify accounting file
+.TE
+.in -5
+.NH
+System facilities
+.LP
+.h 2.1 "Generic operations
+.in +5
+.TS
+lw(1.6i) aw(3i).
+read	read data
+write	write data
+<sys/uio.h>	scatter-gather related definitions
+readv	scattered data input
+writev	gathered data output
+<sys/ioctl.h>	standard control operations
+ioctl	device control operation
+.TE
+.in -5
+.h 2.2 "File system
+.PP
+Operations marked with a * exist in two forms: as shown,
+operating on a file name, and operating on a file descriptor,
+when the name is preceded with a ``f''.
+.in +5
+.TS
+lw(1.6i) aw(3i).
+<sys/file.h>	file system definitions
+chdir	change directory
+chroot	change root directory
+mkdir	make a directory
+rmdir	remove a directory
+open	open a new or existing file
+mknod	make a special file
+portal\(dg	make a portal entry
+unlink	remove a link
+stat*	return status for a file	
+lstat	returned status of link
+chown*	change owner
+chmod*	change mode
+utimes	change access/modify times
+link	make a hard link
+symlink	make a symbolic link
+readlink	read contents of symbolic link
+rename	change name of file
+lseek	reposition within file
+truncate*	truncate file
+access	determine accessibility
+flock	lock a file
+.TE
+.in -5
+.h 2.3 "Communications
+.in +5
+.TS
+lw(1.6i) aw(3i).
+<sys/socket.h>	standard definitions
+socket	create socket
+bind	bind socket to name
+getsockname	get socket name
+listen	allow queuing of connections
+accept	accept a connection
+connect	connect to peer socket
+socketpair	create pair of connected sockets
+sendto	send data to named socket
+send	send data to connected socket
+recvfrom	receive data on unconnected socket
+recv	receive data on connected socket
+sendmsg	send gathered data and/or rights
+recvmsg	receive scattered data and/or rights
+shutdown	partially close full-duplex connection
+getsockopt	get socket option
+setsockopt	set socket option
+.TE
+.in -5
+.h 2.4 "Terminals, block and character devices
+.in +5
+.in -5
+.h 2.5 "Processes and kernel hooks
+.in -5