MQ_UNLINK(3C) Standard C Library Functions MQ_UNLINK(3C)


NAME


mq_unlink - remove a message queue

SYNOPSIS


#include <mqueue.h>

int mq_unlink(const char *name);


DESCRIPTION


The mq_unlink() function removes the message queue named by the pathname
name. After a successful call to mq_unlink() with name, a call to
mq_open(3C) with name fails 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 is postponed until all
references to the message queue have been closed. Calls to mq_open(3C) to
re-create 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 immediately.

RETURN VALUES


Upon successful completion, mq_unlink() returns 0; otherwise, the named
message queue is not changed by this function call, the function returns
-1 and sets errno to indicate the error.

ERRORS


The mq_unlink() function will fail if:

EACCES
Permission is denied to unlink the named message queue.


ENAMETOOLONG
The length of the name string exceeds PATH_MAX, or a
pathname component is longer than NAME_MAX while
_POSIX_NO_TRUNC is in effect.


ENOENT
The named message queue, name, does not exist.


ENOSYS
mq_unlink() is not supported by the system.


ATTRIBUTES


See attributes(7) for descriptions of the following attributes:


+--------------------+-------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+--------------------+-------------------+
|Interface Stability | Committed |
+--------------------+-------------------+
|MT-Level | MT-Safe |
+--------------------+-------------------+
|Standard | See standards(7). |
+--------------------+-------------------+

SEE ALSO


mq_close(3C), mq_open(3C), mqueue.h(3HEAD), attributes(7), standards(7)

NOTES


Solaris 2.6 was the first release to support the Asynchronous Input and
Output option. Prior to this release, this function always returned -1
and set errno to ENOSYS.


February 5, 2008 MQ_UNLINK(3C)