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82 lines
2.4 KiB
Groff
82 lines
2.4 KiB
Groff
.\" Copyright (c) 2002 Tim J. Robbins
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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 AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd February 7, 2014
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.Dt SEM 4
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.Os
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.Sh NAME
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.Nm sem
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.Nd POSIX semaphores
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.Sh SYNOPSIS
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To compile this driver into the kernel,
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place the following line in your
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kernel configuration file:
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.Bd -ragged -offset indent
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.Cd "options P1003_1B_SEMAPHORES"
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.Ed
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.Pp
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Alternatively, to load the driver as a
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module at boot time, place the following line in
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.Xr loader.conf 5 :
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.Bd -literal -offset indent
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sem_load="YES"
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.Ed
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.Pp
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To load the driver as a module at run-time, run the following
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command as root:
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.Bd -ragged -offset indent
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kldload sem
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.Ed
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.Sh DESCRIPTION
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The
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.Nm
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facility provides system calls used by the standard C library
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.Pq Pa libc
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to implement
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.Tn POSIX
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semaphores.
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This facility offers support for such functions as
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.Fn sem_init
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and
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.Fn sem_wait .
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It is available both as a kernel option for static inclusion and as a
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dynamic kernel module.
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.Sh SEE ALSO
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.Xr sem_destroy 3 ,
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.Xr sem_getvalue 3 ,
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.Xr sem_init 3 ,
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.Xr sem_open 3 ,
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.Xr sem_post 3 ,
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.Xr sem_wait 3 ,
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.Xr config 8 ,
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.Xr kldload 8 ,
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.Xr kldunload 8
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.Sh HISTORY
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The
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.Nm
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facility appeared in
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.Fx 5.0 .
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