MQ_CLOSE(3P) POSIX Programmer's Manual MQ_CLOSE(3P)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.
NAMEmq_close — close a message queue (REALTIME)
int mq_close(mqd_t mqdes);
The mq_close() function shall remove the association between the mes‐
sage 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 notifica‐
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:
EBADF The mqdes argument is not a valid message queue descriptor.
The following sections are informative.
SEE ALSOmq_open(), mq_unlink(), msgctl(), msgget(), msgrcv(), msgsnd()
The Base Definitions volume of POSIX.1‐2008, <mqueue.h>
Portions of this text are reprinted and reproduced in electronic form
from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology
-- Portable Operating System Interface (POSIX), The Open Group Base
Specifications Issue 7, Copyright (C) 2013 by the Institute of Electri‐
cal and Electronics Engineers, Inc and The Open Group. (This is
POSIX.1-2008 with the 2013 Technical Corrigendum 1 applied.) In the
event of any discrepancy between this version and the original IEEE and
The Open Group Standard, the original IEEE and The Open Group Standard
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IEEE/The Open Group 2013 MQ_CLOSE(3P)