NAME
mq_close — close a
message queue (REALTIME)
SYNOPSIS
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(3), 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.
EXAMPLES
None.
APPLICATION USAGE
None.
RATIONALE
None.
FUTURE DIRECTIONS
None.
SEE ALSO
mq_open(3) , mq_unlink(3) , msgctl(3) , msgget(3) , msgrcv(3) , msgsnd(3)
XBD <mqueue.h>
CHANGE HISTORY
First released in Issue 5. Included for alignment with the POSIX Realtime Extension.
Issue 6
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.