NAME
mq_close - close a message queue (REALTIME)
SYNOPSIS
#include <mqueue.h>
int mq_close(mqd_t mqdes);
DESCRIPTION
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.
SEE ALSO
mq_open() , mq_unlink() , msgctl() , msgget() , msgrcv() , msgsnd() ,
the Base Definitions volume of IEEE Std 1003.1-2001, <mqueue.h>
COPYRIGHT
Portions of this text are reprinted and reproduced in electronic form
from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
-- Portable Operating System Interface (POSIX), The Open Group Base
Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of
Electrical and Electronics Engineers, Inc and The Open Group. 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
is the referee document. The original Standard can be obtained online
at http://www.opengroup.org/unix/online.html .