trusty (3) mq_unlink.3posix.gz

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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>


       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 .