mq_close - close a message queue descriptor
int mq_close(mqd_t mqdes);
The mq_close() system call removes the association between the message
queue descriptor, mqdes, and a message queue. Use of this message
queue descriptor by the process, after a successful return from this
mq_close(), and until this descriptor is returned by a subsequent
mq_open(), will result in the failure of message queue system calls,
with errno set to EBADF.
If the process has a registered notification request with the message
queue associated with this mqdes, the registration is canceled and the
queue becomes available for another process to register a notification
If the message queue has been unlinked and mqdes is the only existing
open descriptor for the queue, the queue is destroyed.
mq_close() returns the following values:
0 Successful completion.
-1 Failure. errno is set to indicate the error.
If mq_close() fails, errno is set to one of the following values:
[EBADF] mqdes is not a valid message queue descriptor.
[ENOSYS] mq_close() is not supported by the implementation.
mq_open(2), mq_unlink(2), mq_notify(2).
mq_close(): POSIX 1003.1b
Hewlett-Packard Company - 1 - HP-UX Release 11i: November 2000