2011-04-12 08:27:02 +04:00
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.\" $NetBSD: unistd.3,v 1.3 2011/04/12 04:27:02 jruoho Exp $
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2011-04-10 13:58:00 +04:00
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.\"
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.\" Copyright (c) 2011 Jukka Ruohonen <jruohonen@iki.fi>
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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.\" POSSIBILITY OF SUCH DAMAGE.
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.\"
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2011-04-12 08:27:02 +04:00
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.Dd April 12, 2011
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2011-04-10 13:58:00 +04:00
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.Dt UNISTD 3
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.Os
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.Sh NAME
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.Nm unistd
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.Nd standard symbolic constants and types
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.Sh SYNOPSIS
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.In unistd.h
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.Sh DESCRIPTION
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The
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.In unistd.h
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header forms the basis of the Portable Operating System Interface for Unix
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.Pq Tn POSIX
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.Tn API .
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It includes definitions for numerous functions, symbolic constants, and types.
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Among these are:
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.Bl -bullet -offset indent
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.It
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The implementation-defined
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.Dv NULL
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pointer constant.
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.It
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Types such as
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.Vt size_t ,
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.Vt ssize_t ,
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.Vt pid_t ,
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and
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.Vt intptr_t .
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.It
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Various limits and other symbolic constants described in
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.Xr pathconf 2
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and
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.Xr sysconf 3 .
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.It
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Prototypes for several important system calls and library routines such as
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.Xr chown 2 ,
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.Xr dup 2 ,
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.Xr execl 3 ,
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2011-04-10 13:58:00 +04:00
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.Xr fork 2 ,
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.Xr pipe 2 ,
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.Xr rmdir 2 ,
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.Xr setuid 2 ,
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and
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.Xr write 2 .
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.It
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The symbolic constant
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.Dv _POSIX_VERSION
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that defines the version of the
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.Tn POSIX
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standard to which the implementation conforms.
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.It
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Various other
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.Dv _POSIX
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-prefixed symbolic constants that indicate whether
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the system implements some optional part of the standard.
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Examples include such constants as
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.Dv _POSIX_IPV6
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for
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.Xr inet6 4
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functionality and
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.Dv _POSIX_ASYNCHRONOUS_IO
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for
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.Xr aio 3 .
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.El
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.Sh SEE ALSO
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.Xr stddef 3 ,
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.Xr stdint 3 ,
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.Xr stdlib 3 ,
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.Xr types 3
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.Sh STANDARDS
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The
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.In unistd.h
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header conforms to
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.St -p1003.1-2001 .
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.\"
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.\" XXX: fill this.
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.\"
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.\".Sh HISTORY
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.\" A
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.\" .In unistd.h
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.\" header first appeared in
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.\" ???
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