mq_close - Closes a message queue (P1003.1b)
int mq_close (
Closes a message queue. This function removes the association between the message queue descriptor, mqdes, and its open message queue description. When all message queue descriptors associated with an open message queue description have been closed, the associated open message queue description is removed. The message associated with the message queue will then be deleted if mq_unlink was already called, or is called after all processes have closed the queue.
On successful completion, the function returns the value 0; otherwise, the function returns the value -1 and sets errno to indicate the error.
The mq_close function fails under the following conditions:
Functions: mq_open(3), mq_unlink(3) delim off