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MQ_UNLINK(3P) POSIX Programmer's Manual MQ_UNLINK(3P)
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.
mq_unlink — remove a message queue (REALTIME)
#include <mqueue.h>
int mq_unlink(const char *name);
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).
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.
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.
None.
None.
None.
A future version might require the mq_open() and mq_unlink()
functions to have semantics similar to normal file system operations.
mq_close(3p), mq_open(3p), msgctl(3p), msgget(3p), msgrcv(3p),
msgsnd(3p)
The Base Definitions volume of POSIX.1‐2008, mqueue.h(0p)
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 .
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)