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(),
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.
The following sections are informative.
mq_open() , mq_unlink() , msgctl() , msgget()
, msgrcv() , msgsnd() , the Base Definitions volume of
IEEE Std 1003.1-2001, <mqueue.h>
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