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
pathname name. After a successful call to mq_unlink() with name, a call
to mq_open() with name shall fail if the flag O_CREAT is not set in
flags. 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.
Calls to mq_open() to recreate the message queue may fail until the
message queue is actually removed. However, the mq_unlink() call need
not block until all references have been closed; it may return immedi‐
ately.
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.
ENAMETOOLONG
The length of the name argument exceeds {PATH_MAX} or a pathname
component is longer than {NAME_MAX}.
ENOENT The named message queue does not exist.
The following sections are informative.
EXAMPLES
None.
APPLICATION USAGE
None.
RATIONALE
None.
FUTURE DIRECTIONS
None.
SEE ALSOmq_close(), mq_open(), msgctl(), msgget(), msgrcv(), msgsnd(), the Base
Definitions volume of IEEE Std 1003.1-2001, <mqueue.h>
COPYRIGHT
Portions of this text are reprinted and reproduced in electronic form
from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
-- Portable Operating System Interface (POSIX), The Open Group Base
Specifications Issue 6, Copyright (C) 2001-2003 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 .
IEEE/The Open Group 2003 MQ_UNLINK(3P)
