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.