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.

       EINTR  The  call  to  mq_unlink()  blocked waiting for all references to the named message
              queue to be closed and a signal interrupted the call.

       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.1‐2017, <mqueue.h>

COPYRIGHT

       Portions  of  this  text  are  reprinted  and  reproduced in electronic form from IEEE Std
       1003.1-2017, Standard for Information Technology -- Portable  Operating  System  Interface
       (POSIX),  The  Open Group Base Specifications Issue 7, 2018 Edition, Copyright (C) 2018 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 .

       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 .