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/*

 *  NOTE:  The structure of the routines is identical to that of POSIX

 *         Message_queues to leave the option of having unnamed message

 *         queues at a future date.  They are currently not part of the

 *         POSIX standard but unnamed message_queues are.  This is also

 *         the reason for the apparently unnecessary tracking of

 *         the process_shared attribute.  [In addition to the fact that

 *         it would be trivial to add pshared to the mq_attr structure

 *         and have process private message queues.]

 *

 *         This code ignores the O_RDONLY/O_WRONLY/O_RDWR flag at open

 *         time.

 *

 *  $Id: mqueuenotify.c,v 1.2 2001-09-27 11:59:17 chris Exp $

 */

#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/posix/seterr.h>

#include <rtems/posix/mqueue.h>

#include <rtems/posix/time.h>

/*PAGE

 *

 *  _POSIX_Message_queue_Notify_handler

 *

 */

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 );

}

/*PAGE

 *

 *  15.2.6 Notify Process that a Message is Available on a Queue,

 *         P1003.1b-1993, p. 280

 */

int mq_notify(

  mqd_t                  mqdes,

  const struct sigevent *notification

)

{

  register POSIX_Message_queue_Control *the_mq;

  Objects_Locations                     location;

  the_mq = _POSIX_Message_queue_Get( mqdes, &location );

  switch ( location ) {

    case OBJECTS_ERROR:

      set_errno_and_return_minus_one( EBADF );

    case OBJECTS_REMOTE:

      _Thread_Dispatch();

      return POSIX_MP_NOT_IMPLEMENTED();

      set_errno_and_return_minus_one( EINVAL );

    case OBJECTS_LOCAL:

      if ( notification ) {

        if ( _CORE_message_queue_Is_notify_enabled( &the_mq->Message_queue ) ) {

          _Thread_Enable_dispatch();

          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 );

      }

      _Thread_Enable_dispatch();

      return 0;

  }

  return POSIX_BOTTOM_REACHED();

}