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



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

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>

COPYRIGHT
       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, Copy-
       right (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.open-
       group.org/unix/online.html .



IEEE/The Open Group                                           2003                                                  MQ_CLOSE(3P)