mq_close(3) [x11r4 man page]

MQ_CLOSE(3)						     Linux Programmer's Manual						       MQ_CLOSE(3)

NAME

       mq_close - close a message queue descriptor

SYNOPSIS

       #include <mqueue.h>

       int mq_close(mqd_t mqdes);

       Link with -lrt.

DESCRIPTION

       mq_close() closes the message queue descriptor mqdes.

       If  the	calling  process  has  attached  a  notification request (see (mq_notify(3)) to this message queue via mqdes, then this request is
       removed, and another process can now attach a notification request.

RETURN VALUE

       On success mq_close() returns 0; on error, -1 is returned, with errno set to indicate the error.

ERRORS

       EBADF  The message queue descriptor specified in mqdes is invalid.

ATTRIBUTES

       For an explanation of the terms used in this section, see attributes(7).

       +-----------+---------------+---------+
       |Interface  | Attribute	   | Value   |
       +-----------+---------------+---------+
       |mq_close() | Thread safety | MT-Safe |
       +-----------+---------------+---------+
CONFORMING TO

       POSIX.1-2001, POSIX.1-2008.

NOTES

       All open message queues are automatically closed on process termination, or upon execve(2).

SEE ALSO

       mq_getattr(3), mq_notify(3), mq_open(3), mq_receive(3), mq_send(3), mq_unlink(3), mq_overview(7)

COLOPHON

       This page is part of release 4.15 of the Linux man-pages project.  A description of the project, information about reporting bugs, and  the
       latest version of this page, can be found at https://www.kernel.org/doc/man-pages/.

Linux								    2017-09-15							       MQ_CLOSE(3)

MQ_CLOSE(2)						      BSD System Calls Manual						       MQ_CLOSE(2)

NAME

     mq_close -- close a message queue (REALTIME)

LIBRARY

     POSIX Real-time Library (librt, -lrt)

SYNOPSIS

     #include <mqueue.h>

     int
     mq_close(mqd_t mqdes);

DESCRIPTION

     The mq_close() system call removes the association between the message queue descriptor, mqdes, and its message queue.  The results of using
     this message queue descriptor after successful return from this mq_close(), and until the return of this message queue descriptor from a sub-
     sequent mq_open(), are undefined.

     If the process has successfully attached a notification request to the message queue via this mqdes, this attachment will be removed, and the
     message queue is available for another process to attach for notification.

RETURN VALUES

     Upon successful completion, the value 0 is returned; otherwise the value -1 is returned and the global variable errno is set to indicate the
     error.

ERRORS

     The mq_close() system call will fail if:

     [EBADF]		The mqdes argument is not a valid message queue descriptor.

SEE ALSO

     mq_open(2), mq_unlink(2)

STANDARDS

     The mq_close() system call conforms to IEEE Std 1003.1-2004 (``POSIX.1'').

HISTORY

     Support for POSIX message queues first appeared in FreeBSD 7.0.

COPYRIGHT

     Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2004 Edition, Standard for Information Technology
     -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2004 by the Institute of Elec-
     trical and Electronics Engineers, Inc and The Open Group.	In the event of any discrepancy between this version and the original IEEE and The
     Open Group Standard, the original IEEE and The Open Group Standard is the referee document.  The original Standard can be obtained online at
	  http://www.opengroup.org/unix/online.html.

BSD
								 November 29, 2005							       BSD