mq_close3p
Close a message queue (realtime)
Usage
#include <mqueue.h>
int mq_close(mqd_t mqdes);
Prolog
This manual page is part of the POSIX Programmer's Manual. The Linux implementation of this interface may differ (consult the corresponding Linux manual page for details of Linux behavior), or the interface may not be implemented on Linux.
Overview
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.
Return value
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.
Errors
The mq_close() function shall fail if:
- EBADF
-
The mqdes argument is not a valid message queue descriptor.
The following sections are informative.
Examples
None.
Application usage
None.
Rationale
None.
Future directions
None.