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.

Debian                                          November 29, 2005                                    MQ_CLOSE(2)