mq_close - close a message queue (REALTIME)
The mq_close() function shall remove 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(), are undefined.
If the process has successfully attached a notification request to the message queue via this mqdes, this attachment shall be removed, and the message queue is available for another process to attach for notification.
Upon successful completion, the mq_close() function shall return a value of zero; otherwise, the function shall return a value of -1 and set errno to indicate the error.
The mq_close() function shall fail if:
- The mqdes argument is not a valid message queue descriptor.
mq_open , mq_unlink , msgctl , msgget , msgrcv , msgsnd
First released in Issue 5. Included for alignment with the POSIX Realtime Extension.
The mq_close() function is marked as part of the Message Passing option.
The [ENOSYS] error condition has been removed as stubs need not be provided if an implementation does not support the Message Passing option.
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