PROLOG

       This  manual  page  is part of the POSIX Programmer's Manual.  The Linux implementation of this interface
       may differ (consult 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 string name.  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. However, the mq_unlink() call
       need not block until all references have been closed; it may return immediately.

       After a successful call to mq_unlink(), reuse of the name shall subsequently cause mq_open() to behave as
       if  no  message  queue  of  this name exists (that is, mq_open() will fail if O_CREAT is not set, or will
       create a new message queue if O_CREAT is set).

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.

       ENOENT The named message queue does not exist.

       The mq_unlink() function may fail if:

       ENAMETOOLONG
              The length of the name argument exceeds {_POSIX_PATH_MAX} on systems that do not support  the  XSI
              option  or  exceeds  {_XOPEN_PATH_MAX}  on XSI systems, or has a pathname component that is longer
              than  {_POSIX_NAME_MAX}  on  systems  that  do  not  support  the  XSI  option  or   longer   than
              {_XOPEN_NAME_MAX}  on  XSI  systems.  A call to mq_unlink() with a name argument that contains the
              same message queue name as was previously used in a successful mq_open() call shall  not  give  an
              [ENAMETOOLONG] error.

       The following sections are informative.

EXAMPLES

       None.

APPLICATION USAGE

       None.

RATIONALE

       None.

FUTURE DIRECTIONS

       A  future  version  might  require  the  mq_open() and mq_unlink() functions to have semantics similar to
       normal file system operations.

SEE ALSO

       mq_close(), mq_open(), msgctl(), msgget(), msgrcv(), msgsnd()

       The Base Definitions volume of POSIX.1‐2008, <mqueue.h>

COPYRIGHT

       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2013 Edition,
       Standard  for  Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base
       Specifications Issue 7, Copyright (C) 2013 by the Institute of Electrical and Electronics Engineers,  Inc
       and  The  Open Group.  (This is POSIX.1-2008 with the 2013 Technical Corrigendum 1 applied.) 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.unix.org/online.html .

       Any typographical or formatting errors that appear in this page are most likely to have  been  introduced
       during   the   conversion  of  the  source  files  to  man  page  format.  To  report  such  errors,  see
       https://www.kernel.org/doc/man-pages/reporting_bugs.html .