MQ_UNLINK(3P) POSIX Programmer's Manual MQ_UNLINK(3P)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.
NAMEmq_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 post‐
poned until all references to the message queue have been closed. How‐
ever, 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 subse‐
quently 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 con‐
tains 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 ALSOmq_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 Electri‐
cal 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.ker‐
nel.org/doc/man-pages/reporting_bugs.html .
IEEE/The Open Group 2013 MQ_UNLINK(3P)
