MQ_UNLINK(3P)                                       POSIX Programmer's Manual                                      MQ_UNLINK(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_unlink - remove a message queue (REALTIME)

SYNOPSIS
       #include <mqueue.h>

       int mq_unlink(const char *name);


DESCRIPTION
       The  mq_unlink()  function  shall  remove  the  message  queue  named  by  the  pathname name. After a successful call to
       mq_unlink() with name, a call to mq_open() with name shall fail if the flag O_CREAT is not set in flags. If one  or  more
       processes  have  the  message  queue open when mq_unlink() is called, destruction of the message queue shall be postponed
       until all references to the message queue have been closed.

       Calls to mq_open() to recreate the message queue may fail until the message  queue  is  actually  removed.  However,  the
       mq_unlink() call need not block until all references have been closed; it may return immediately.

RETURN VALUE
       Upon  successful  completion,  the  function  shall  return a value of zero.  Otherwise, the named message queue shall be
       unchanged by this function call, and the function shall return a value of -1 and set errno to indicate the error.

ERRORS
       The mq_unlink() function shall fail if:

       EACCES Permission is denied to unlink the named message queue.

       ENAMETOOLONG
              The length of the name argument exceeds {PATH_MAX} or a pathname component is longer than {NAME_MAX}.

       ENOENT The named message queue does not exist.


       The following sections are informative.

EXAMPLES
       None.

APPLICATION USAGE
       None.

RATIONALE
       None.

FUTURE DIRECTIONS
       None.

SEE ALSO
       mq_close(), mq_open(), 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_UNLINK(3P)