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+.\" Copyright (c) 2002 Tim J. Robbins
+.\" 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 AUTHOR 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 AUTHOR 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.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd November 11, 2006
+.Dt SEM 4
+.Os
+.Sh NAME
+.Nm sem
+.Nd POSIX semaphores
+.Sh SYNOPSIS
+To compile this driver into the kernel,
+place the following lines in your
+kernel configuration file:
+.Bd -ragged -offset indent
+.Cd "options P1003_1B_SEMAPHORES"
+.Ed
+.Pp
+Alternatively, to load the driver as a
+module at boot time, place the following line in
+.Xr loader.conf 5 :
+.Bd -literal -offset indent
+sem_load="YES"
+.Ed
+.Pp
+.Dl "kldload sem"
+.Sh DESCRIPTION
+The
+.Nm
+facility provides system calls used by the standard C library
+.Pq Pa libc
+to implement
+.Tn POSIX
+semaphores.
+This facility offers support for such functions as
+.Fn sem_init
+and
+.Fn sem_wait .
+It is available both as a kernel option for static inclusion and as a
+dynamic kernel module.
+.Sh SEE ALSO
+.Xr sem_destroy 3 ,
+.Xr sem_getvalue 3 ,
+.Xr sem_init 3 ,
+.Xr sem_open 3 ,
+.Xr sem_post 3 ,
+.Xr sem_wait 3 ,
+.Xr config 8 ,
+.Xr kldload 8 ,
+.Xr kldunload 8
+.Sh HISTORY
+The
+.Nm
+facility appeared as a kernel option in
+.Fx 3.0 .
+The
+.Nm
+kernel module appeared in
+.Fx 5.0 .