mq_close

- close a message queue

Synopsis

cc [ flag... ] file... -lrt [ library... ]
#include <mqueue.h> 

int mq_close(mqd_t mqdes);

Description

The mq_close() function removes the association between the message queue descriptor, mqdes, and its message queue. The results of using this message queue descriptor after successful return from this mq_close(), and until the return of this message queue descriptor from a subsequent mq_open(3RT), are undefined.

If the process (or thread) has successfully attached a notification request to the message queue via this mqdes, this attachment is removed and the message queue is available for another process to attach for notification.

Return Values

Upon successful completion, mq_close() returns 0; otherwise, the function returns -1 and sets errno to indicate the error condition.

Errors

The mq_close() function will fail if:

EBADF

The mqdes argument is an invalid message queue descriptor.

ENOSYS

The mq_open() function is not supported by the system.

Attributes

See attributes(5) for descriptions of the following attributes:

See Also

mqueue.h(3HEAD), mq_notify(3RT), mq_open(3RT), mq_unlink(3RT), attributes(5), standards(5)

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.