mq_unlink(3p) — Linux manual page


MQ_UNLINK(3P)             POSIX Programmer's Manual            MQ_UNLINK(3P)

PROLOG         top

       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         top

       mq_unlink — remove a message queue (REALTIME)

SYNOPSIS         top

       #include <mqueue.h>

       int mq_unlink(const char *name);

DESCRIPTION         top

       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         top

       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         top

       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:

              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]

       The following sections are informative.

EXAMPLES         top




RATIONALE         top



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

SEE ALSO         top

       mq_close(3p), mq_open(3p), msgctl(3p), msgget(3p), msgrcv(3p),

       The Base Definitions volume of POSIX.1‐2008, mqueue.h(0p)

COPYRIGHT         top

       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 .

       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 .

IEEE/The Open Group                 2013                       MQ_UNLINK(3P)

Pages that refer to this page: mqueue.h(0p)mq_close(3p)mq_open(3p)msgctl(3p)msgget(3p)msgrcv(3p)msgsnd(3p)