1.\" Copyright (c) 2005 David Xu <davidxu@FreeBSD.org> 2.\" All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice(s), this list of conditions and the following disclaimer as 9.\" the first lines of this file unmodified other than the possible 10.\" addition of one or more copyright notices. 11.\" 2. Redistributions in binary form must reproduce the above copyright 12.\" notice(s), this list of conditions and the following disclaimer in 13.\" the documentation and/or other materials provided with the 14.\" distribution. 15.\" 16.\" THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) ``AS IS'' AND ANY 17.\" EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 19.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) BE 20.\" LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 21.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 22.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR 23.\" BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 24.\" WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE 25.\" OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, 26.\" EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27.\" 28.\" Portions of this text are reprinted and reproduced in electronic form 29.\" from IEEE Std 1003.1, 2004 Edition, Standard for Information Technology -- 30.\" Portable Operating System Interface (POSIX), The Open Group Base 31.\" Specifications Issue 6, Copyright (C) 2001-2004 by the Institute of 32.\" Electrical and Electronics Engineers, Inc and The Open Group. In the 33.\" event of any discrepancy between this version and the original IEEE and 34.\" The Open Group Standard, the original IEEE and The Open Group Standard is 35.\" the referee document. The original Standard can be obtained online at 36.\" http://www.opengroup.org/unix/online.html. 37.\" 38.Dd November 29, 2005 39.Dt MQ_CLOSE 2 40.Os 41.Sh NAME 42.Nm mq_close 43.Nd "close a message queue (REALTIME)" 44.Sh LIBRARY 45.Lb librt 46.Sh SYNOPSIS 47.In mqueue.h 48.Ft int 49.Fn mq_close "mqd_t mqdes" 50.Sh DESCRIPTION 51The 52.Fn mq_close 53system call removes the association between the message queue descriptor, 54.Fa mqdes , 55and its message queue. 56The results of using this message queue descriptor 57after successful return from this 58.Fn mq_close , 59and until the return of this message queue descriptor from a subsequent 60.Fn mq_open , 61are undefined. 62.Pp 63If the process has successfully attached a notification request to the 64message queue via this 65.Fa mqdes , 66this attachment will be removed, and the message queue is available for 67another process to attach for notification. 68.Sh RETURN VALUES 69.Rv -std 70.Sh ERRORS 71The 72.Fn mq_close 73system call 74will fail if: 75.Bl -tag -width Er 76.It Bq Er EBADF 77The 78.Fa mqdes 79argument is not a valid message queue descriptor. 80.El 81.Sh SEE ALSO 82.Xr mq_open 2 , 83.Xr mq_unlink 2 84.Sh STANDARDS 85The 86.Fn mq_close 87system call conforms to 88.St -p1003.1-2004 . 89.Sh HISTORY 90Support for 91.Tn POSIX 92message queues first appeared in 93.Fx 7.0 . 94.Sh COPYRIGHT 95Portions of this text are reprinted and reproduced in electronic form 96from IEEE Std 1003.1, 2004 Edition, Standard for Information Technology -- 97Portable Operating System Interface (POSIX), The Open Group Base 98Specifications Issue 6, Copyright (C) 2001-2004 by the Institute of 99Electrical and Electronics Engineers, Inc and The Open Group. In the 100event of any discrepancy between this version and the original IEEE and 101The Open Group Standard, the original IEEE and The Open Group Standard is 102the referee document. The original Standard can be obtained online at 103http://www.opengroup.org/unix/online.html. 104