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+.\" $NetBSD: sem.4,v 1.8 2025/11/07 19:15:48 pgoyette Exp $
+.\"
+.\" 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.
+.\"
+.\" From: FreeBSD: src/share/man/man4/sem.4,v 1.2 2003/06/02 11:19:23 ru
+.\"
+.Dd August 20, 2015
+.Dt SEM 4
+.Os
+.Sh NAME
+.Nm sem
+.Nd POSIX semaphores
+.Sh SYNOPSIS
+The POSIX semaphore code is included by default in all kernels.
+.Sh DESCRIPTION
+The
+.Nm
+facility provides system calls used by the standard C library
+.Pq libc
+to implement
+.Tn POSIX
+semaphores.
+.Sh SEE ALSO
+.Xr config 1 ,
+.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 options 4
+.Sh HISTORY
+The
+.Nm
+facility appeared as a kernel option in
+.Nx 2.0
+and became non-optional in
+.Nx 7.0 .