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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.

 *

 *  mqueueunlink.c,v 1.8 2002/01/04 18:28:24 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

 *

 *  15.2.2 Remove a Message Queue, P1003.1b-1993, p. 276

 */

int mq_unlink(

  const char *name

)

{

  int                                   status;

  register POSIX_Message_queue_Control *the_mq;

  Objects_Id                            the_mq_id;

  _Thread_Disable_dispatch();

  status = _POSIX_Message_queue_Name_to_id( name, &the_mq_id );

   if ( status != 0 ) {

    _Thread_Enable_dispatch();

    rtems_set_errno_and_return_minus_one( status );

   }

  /*

   *  Don't support unlinking a remote message queue.

   */

  if ( !_Objects_Is_local_id(the_mq_id) ) {

    _Thread_Enable_dispatch();

    rtems_set_errno_and_return_minus_one( ENOSYS );

  }

  the_mq = (POSIX_Message_queue_Control *) _Objects_Get_local_object(

    &_POSIX_Message_queue_Information,

    _Objects_Get_index( the_mq_id )

  );

#if 0 && defined(RTEMS_MULTIPROCESSING)

  if ( the_mq->process_shared == PTHREAD_PROCESS_SHARED ) {

    _Objects_MP_Close( &_POSIX_Message_queue_Information, the_mq_id );

  }

#endif

  the_mq->linked = FALSE;

  _POSIX_Message_queue_Namespace_remove( the_mq );

  _POSIX_Message_queue_Delete( the_mq );

  _Thread_Enable_dispatch();

  return 0;

}