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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 (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  post-
       poned  until all references to the message queue have been closed. How-
       ever, 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 subse-
       quently 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  con-
              tains  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 Electri-
       cal 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.ker-
       nel.org/doc/man-pages/reporting_bugs.html .
IEEE/The Open Group                  2013                        MQ_UNLINK(3P)