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/**
* @file
*
* @brief Notify Process that a Message is Available on a Queue
* @ingroup POSIX_MQUEUE
*/
/*
* COPYRIGHT (c) 1989-2007.
* On-Line Applications Research Corporation (OAR).
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.com/license/LICENSE.
*/
#if HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdarg.h>
#include <pthread.h>
#include <limits.h>
#include <errno.h>
#include <fcntl.h>
#include <mqueue.h>
#include <sys/types.h>
#include <signal.h>
#include <rtems/system.h>
#include <rtems/score/watchdog.h>
#include <rtems/seterr.h>
#include <rtems/posix/mqueueimpl.h>
#include <rtems/posix/time.h>
/*
* _POSIX_Message_queue_Notify_handler
*
*/
static void _POSIX_Message_queue_Notify_handler(
void *user_data
)
{
POSIX_Message_queue_Control *the_mq;
the_mq = user_data;
kill( getpid(), the_mq->notification.sigev_signo );
_CORE_message_queue_Set_notify( &the_mq->Message_queue, NULL, NULL );
}
int mq_notify(
mqd_t mqdes,
const struct sigevent *notification
)
{
POSIX_Message_queue_Control *the_mq;
POSIX_Message_queue_Control_fd *the_mq_fd;
Objects_Locations location;
the_mq_fd = _POSIX_Message_queue_Get_fd( mqdes, &location );
switch ( location ) {
case OBJECTS_LOCAL:
the_mq = the_mq_fd->Queue;
if ( notification ) {
if ( _CORE_message_queue_Is_notify_enabled( &the_mq->Message_queue ) ) {
_Objects_Put( &the_mq_fd->Object );
rtems_set_errno_and_return_minus_one( EBUSY );
}
_CORE_message_queue_Set_notify( &the_mq->Message_queue, NULL, NULL );
the_mq->notification = *notification;
_CORE_message_queue_Set_notify(
&the_mq->Message_queue,
_POSIX_Message_queue_Notify_handler,
the_mq
);
} else {
_CORE_message_queue_Set_notify( &the_mq->Message_queue, NULL, NULL );
}
_Objects_Put( &the_mq_fd->Object );
return 0;
#if defined(RTEMS_MULTIPROCESSING)
case OBJECTS_REMOTE:
#endif
case OBJECTS_ERROR:
break;
}
rtems_set_errno_and_return_minus_one( EBADF );
}
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