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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
     subsequent 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
     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.