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PROLOG | NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | EXAMPLES | APPLICATION USAGE | RATIONALE | FUTURE DIRECTIONS | SEE ALSO | COPYRIGHT |
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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.
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:
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.1‐2017, mqueue.h(0p)
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 http://www.opengroup.org/unix/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 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)
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HTML rendering created 2024-06-26 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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