2005-11-30 04:12:37 +00:00
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.\" Copyright (c) 2005 David Xu <davidxu@FreeBSD.org>
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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(s), this list of conditions and the following disclaimer as
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.\" the first lines of this file unmodified other than the possible
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.\" addition of one or more copyright notices.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice(s), this list of conditions and the following disclaimer in
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.\" the documentation and/or other materials provided with the
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.\" distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) ``AS IS'' AND ANY
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.\" EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) BE
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.\" LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
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.\" BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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.\" WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
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.\" OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
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.\" EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd November 29, 2005
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.Dt MQ_CLOSE 2
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.Os
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.Sh NAME
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.Nm mq_close
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.Nd "close a message queue (REALTIME)"
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.Sh LIBRARY
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.Lb libc
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.Sh SYNOPSIS
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.In mqueue.h
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.Ft int
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.Fn mq_close "mqd_t mqdes"
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.Sh DESCRIPTION
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The
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.Fn mq_close
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2005-12-02 13:50:56 +00:00
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system call removes the association between the message queue descriptor,
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2005-11-30 04:12:37 +00:00
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.Fa mqdes ,
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and its message queue. The results of using this message queue descriptor
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after successful return from this
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.Fn mq_close ,
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and until the return of this message queue descriptor from a subsequent
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.Fn mq_open ,
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are undefined.
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.Pp
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If the process has successfully attached a notification request to the
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message queue via this
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.Fa mqdes ,
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this attachment will be removed, and the message queue is available for
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another process to attach for notification.
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.Sh RETURN VALUES
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Upon successful completion, the
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.Fn mq_close
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2005-12-02 13:50:56 +00:00
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system call returns a value of zero; otherwise, the system call returns a
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2005-11-30 04:12:37 +00:00
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value of -1 and set
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.Va errno
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to indicate the error.
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.Sh ERRORS
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The
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.Fn mq_close
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system call
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will fail if:
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.Bl -tag -width Er
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.It Bq Er EBADF
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The
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.Fa mqdes
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argument is not a valid message queue descriptor.
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.El
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.Sh SEE ALSO
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.Xr mq_open 2 ,
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.Xr mq_unlink 2
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.Sh STANDARDS
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The
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.Fn mq_close
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system call conform to
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.St -p1003.1-2004 .
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.Sh HISTORY
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Support for POSIX message queue first appeared in
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.Fx 7.0 .
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