source: rtems/cpukit/posix/src/mqueuesetattr.c @ be1b8a7

/**
 * @file
 *
 * @brief Set Message Queue Attributes
 * @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 <rtems/system.h>
#include <rtems/score/watchdog.h>
#include <rtems/seterr.h>
#include <rtems/posix/mqueueimpl.h>
#include <rtems/posix/time.h>

int mq_setattr(
  mqd_t                 mqdes,
  const struct mq_attr *mqstat,
  struct mq_attr       *omqstat
)
{
  POSIX_Message_queue_Control_fd *the_mq_fd;
  CORE_message_queue_Control     *the_core_mq;
  Objects_Locations               location;

  if ( !mqstat )
    rtems_set_errno_and_return_minus_one( EINVAL );

  the_mq_fd = _POSIX_Message_queue_Get_fd( mqdes, &location );
  switch ( location ) {

    case OBJECTS_LOCAL:

      the_core_mq = &the_mq_fd->Queue->Message_queue;

      /*
       *  Return the old values.
       */

      if ( omqstat ) {
        omqstat->mq_flags   = the_mq_fd->oflag;
        omqstat->mq_msgsize = the_core_mq->maximum_message_size;
        omqstat->mq_maxmsg  = the_core_mq->maximum_pending_messages;
        omqstat->mq_curmsgs = the_core_mq->number_of_pending_messages;
      }

      the_mq_fd->oflag = mqstat->mq_flags;
      _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 );
}