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+'\" t
+.\" Copyright (C) 2006 Michael Kerrisk <mtk.manpages@gmail.com>
+.\"
+.\" SPDX-License-Identifier: Linux-man-pages-copyleft
+.\"
+.TH mq_close 3 2023-07-20 "Linux man-pages 6.05.01"
+.SH NAME
+mq_close \- close a message queue descriptor
+.SH LIBRARY
+Real-time library
+.RI ( librt ", " \-lrt )
+.SH SYNOPSIS
+.nf
+.B #include <mqueue.h>
+.PP
+.BI "int mq_close(mqd_t " mqdes );
+.fi
+.SH DESCRIPTION
+.BR mq_close ()
+closes the message queue descriptor
+.IR mqdes .
+.PP
+If the calling process has attached a notification request (see
+.BR mq_notify (3))
+to this message queue via
+.IR mqdes ,
+then this request is removed,
+and another process can now attach a notification request.
+.SH RETURN VALUE
+On success
+.BR mq_close ()
+returns 0; on error, \-1 is returned, with
+.I errno
+set to indicate the error.
+.SH ERRORS
+.TP
+.B EBADF
+The message queue descriptor specified in
+.I mqdes
+is invalid.
+.SH ATTRIBUTES
+For an explanation of the terms used in this section, see
+.BR attributes (7).
+.TS
+allbox;
+lbx lb lb
+l l l.
+Interface	Attribute	Value
+T{
+.na
+.nh
+.BR mq_close ()
+T}	Thread safety	MT-Safe
+.TE
+.sp 1
+.SH STANDARDS
+POSIX.1-2008.
+.SH HISTORY
+POSIX.1-2001.
+.SH NOTES
+All open message queues are automatically closed on process termination,
+or upon
+.BR execve (2).
+.SH SEE ALSO
+.BR mq_getattr (3),
+.BR mq_notify (3),
+.BR mq_open (3),
+.BR mq_receive (3),
+.BR mq_send (3),
+.BR mq_unlink (3),
+.BR mq_overview (7)