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.

       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:

              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         top




RATIONALE         top



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

SEE ALSO         top

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

       The Base Definitions volume of POSIX.1‐2017, mqueue.h(0p)

COPYRIGHT         top

       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 .

       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               2017                     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)