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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
       IEEE Std 1003.1-2001, <mqueue.h>


       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition,
       Standard  for  Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base
       Specifications Issue 6, Copyright (C) 2001-2003 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 .