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

mq_unlink - remove a message queue

#include <mqueue.h>
int mq_unlink(const char *name);

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.

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.

The mq_unlink() function will fail if:


Permission is denied to unlink the named message queue.


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.


The named message queue, name, does not exist.


mq_unlink() is not supported by the system.

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

Interface Stability Committed
MT-Level MT-Safe
Standard See standards(7).

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

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 OmniOS