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 .