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+.\" $NetBSD: unistd.3,v 1.4 2011/08/09 18:11:38 jruoho Exp $
+.\"
+.\" Copyright (c) 2011 Jukka Ruohonen <jruohonen@iki.fi>
+.\" All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
+.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+.\" PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
+.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+.\" POSSIBILITY OF SUCH DAMAGE.
+.\"
+.Dd August 9, 2011
+.Dt UNISTD 3
+.Os
+.Sh NAME
+.Nm unistd
+.Nd standard symbolic constants and types
+.Sh SYNOPSIS
+.In unistd.h
+.Sh DESCRIPTION
+The
+.In unistd.h
+header forms the basis of the Portable Operating System Interface for Unix
+.Pq Tn POSIX
+.Tn API .
+It includes definitions for numerous functions, symbolic constants, and types.
+Among these are:
+.Bl -bullet -offset indent
+.It
+The implementation-defined
+.Dv NULL
+pointer constant.
+.It
+Types such as
+.Vt size_t ,
+.Vt ssize_t ,
+.Vt pid_t ,
+and
+.Vt intptr_t .
+.It
+Various limits and other symbolic constants described in
+.Xr pathconf 2
+and
+.Xr sysconf 3 .
+.It
+Prototypes for several important system calls and library routines such as
+.Xr chown 2 ,
+.Xr dup 2 ,
+.Xr execl 3 ,
+.Xr fork 2 ,
+.Xr pipe 2 ,
+.Xr rmdir 2 ,
+.Xr setuid 2 ,
+and
+.Xr write 2 .
+.It
+The symbolic constant
+.Dv _POSIX_VERSION
+that defines the version of the
+.Tn POSIX
+standard to which the implementation conforms.
+.It
+Various other
+.Dv _POSIX
+-prefixed symbolic constants that indicate whether
+the system implements some optional part of the standard.
+Examples include such constants as
+.Dv _POSIX_IPV6
+for
+.Xr inet6 4
+functionality and
+.Dv _POSIX_ASYNCHRONOUS_IO
+for
+.Xr aio 3 .
+.El
+.Sh SEE ALSO
+.Xr limits 3 ,
+.Xr stddef 3 ,
+.Xr stdint 3 ,
+.Xr stdlib 3 ,
+.Xr types 3
+.Sh STANDARDS
+The
+.In unistd.h
+header conforms to
+.St -p1003.1-2001 .
+.\"
+.\" XXX: fill this.
+.\"
+.\".Sh HISTORY
+.\" A
+.\" .In unistd.h
+.\" header first appeared in
+.\" ???