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



PROLOG
       This manual page is part of the POSIX Programmer's Manual.  The OS
       implementation of this interface may differ (consult the corresponding
       OS manual page for details of OS behavior), or the interface may not be
       implemented on OS.

NAME
       mq_close -- close a message queue (REALTIME)

SYNOPSIS
       #include <mqueue.h>

       int mq_close(mqd_t mqdes);

DESCRIPTION
       The mq__close() function shall remove 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 subsequent mq__open(), are undefined.

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

RETURN VALUE
       Upon successful completion, the mq__close() function shall return a
       value of zero; otherwise, the function shall return a value of -1 and
       set errno to indicate the error.

ERRORS
       The mq__close() function shall fail if:

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

       The following sections are informative.

EXAMPLES
       None.

APPLICATION USAGE
       None.

RATIONALE
       None.

FUTURE DIRECTIONS
       None.

SEE ALSO
       mq__open(), mq__unlink(), msgctl(), msgget(), msgrcv(), msgsnd()

       The Base Definitions volume of POSIX.1-2017, <mqueue.h>

COPYRIGHT
       Portions of this text are reprinted and reproduced in electronic form
       from IEEE Std 1003.1-2017, Standard for Information Technology --
       Portable Operating System Interface (POSIX), The Open Group Base
       Specifications Issue 7, 2018 Edition, Copyright (C) 2018 by the
       Institute of Electrical 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 .

       Any typographical or formatting errors that appear in this page are
       most likely to have been introduced during the conversion of the source
       files to man page format. To report such errors, see
       https://www.kernel.org/doc/man-pages/reporting_bugs.html .



IEEE/The Open Group                  2017                          MQ_CLOSE(3)
