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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.

 *

 *  mqueuegetattr.c,v 1.6 2002/04/26 23:39:01 joel Exp

 */

#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 <rtems/system.h>

#include <rtems/score/watchdog.h>

#include <rtems/seterr.h>

#include <rtems/posix/mqueue.h>

#include <rtems/posix/time.h>

/*PAGE

 *

 *  15.2.8 Get Message Queue Attributes, P1003.1b-1993, p. 283

 */

int mq_getattr(

  mqd_t           mqdes,

  struct mq_attr *mqstat

)

{

  POSIX_Message_queue_Control          *the_mq;

  POSIX_Message_queue_Control_fd       *the_mq_fd;

  Objects_Locations                     location;

  CORE_message_queue_Attributes        *the_mq_attr;

  if ( !mqstat )

    rtems_set_errno_and_return_minus_one( EINVAL );

  the_mq_fd = _POSIX_Message_queue_Get_fd( mqdes, &location );

  switch ( location ) {

    case OBJECTS_ERROR:

      rtems_set_errno_and_return_minus_one( EBADF );

    case OBJECTS_REMOTE:

      _Thread_Dispatch();

      return POSIX_MP_NOT_IMPLEMENTED();

      rtems_set_errno_and_return_minus_one( EINVAL );

    case OBJECTS_LOCAL:

      the_mq = the_mq_fd->Queue;

      /*

       *  Return the old values.

       */

      the_mq_attr = &the_mq->Message_queue.Attributes;

      mqstat->mq_flags   = the_mq_fd->oflag;

      mqstat->mq_msgsize = the_mq->Message_queue.maximum_message_size;

      mqstat->mq_maxmsg  = the_mq->Message_queue.maximum_pending_messages;

      mqstat->mq_curmsgs = the_mq->Message_queue.number_of_pending_messages;

      _Thread_Enable_dispatch();

      return 0;

  }

  return POSIX_BOTTOM_REACHED();

}