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+.\"	$NetBSD: _ksem.2,v 1.2 2015/11/29 21:38:10 wiz Exp $
+.\"
+.\" Copyright (c) 2015 The NetBSD Foundation, Inc.
+.\" 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 November 30, 2015
+.Dt _KSEM 2
+.Os
+.Sh NAME
+.Nm _ksem ,
+.Nm _ksem_init ,
+.Nm _ksem_open ,
+.Nm _ksem_close ,
+.Nm _ksem_unlink ,
+.Nm _ksem_destroy ,
+.Nm _ksem_getvalue ,
+.Nm _ksem_post ,
+.Nm _ksem_wait ,
+.Nm _ksem_timedwait ,
+.Nm _ksem_trywait
+.Nd back-end implementation for POSIX semaphores
+.Sh SYNOPSIS
+.In sys/ksem.h
+.Ft int
+.Fn _ksem_init "int value" "intptr_t *idp"
+.Ft int
+.Fn _ksem_open "const char *name" "int oflag" "mode_t mode" "unsigned int value" "intptr_t *idp"
+.Ft int
+.Fn _ksem_close "intptr_t id"
+.Ft int
+.Fn _ksem_unlink "const char *name"
+.Ft int
+.Fn _ksem_destroy "intptr_t id"
+.Ft int
+.Fn _ksem_getvalue "intptr_t id" "unsigned int *value"
+.Ft int
+.Fn _ksem_post "intptr_t id"
+.Ft int
+.Fn _ksem_wait "intptr_t id"
+.Ft int
+.Fn _ksem_timedwait "intptr_t id" "const struct timespec *abstime"
+.Ft int
+.Fn _ksem_trywait "intptr_t id"
+.Sh DESCRIPTION
+The
+.Fn _ksem_*
+family of system calls provide the kernel implementation of POSIX
+semaphores.
+.Sh RETURN VALUES
+Successful calls to the
+.Fn _ksem_*
+system calls return a value of zero.
+Otherwise, \-1 is returned and
+.Va errno
+is set to provide more information.
+.Sh ERRORS
+Please see the section 3 manual pages for specific error information.
+.Sh SEE ALSO
+.Xr sem_close 3 ,
+.Xr sem_destroy 3 ,
+.Xr sem_getvalue 3 ,
+.Xr sem_init 3 ,
+.Xr sem_open 3 ,
+.Xr sem_post 3 ,
+.Xr sem_unlink 3 ,
+.Xr sem_wait 3 ,
+.Xr sem 4
+.Sh HISTORY
+Most of the
+.Fn _ksem_*
+system calls first appeared in
+.Nx 2.0 .
+The
+.Fn _ksem_timedwait
+system call first appeared in
+.Nx 5.0 .