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/*

 *  semunlink.c,v 1.8 2002/01/04 18:28:24 joel Exp

 */

#if HAVE_CONFIG_H

#include "config.h"

#endif

#include <stdarg.h>

#include <errno.h>

#include <fcntl.h>

#include <pthread.h>

#include <semaphore.h>

#include <limits.h>

#include <rtems/system.h>

#include <rtems/score/object.h>

#include <rtems/posix/semaphore.h>

#include <rtems/posix/time.h>

#include <rtems/seterr.h>

/*PAGE

 *

 *  sem_unlink

 *

 *  Unlinks a named semaphore, sem_close must also be called to remove

 *  the semaphore.

 *

 *  11.2.5 Remove a Named Semaphore, P1003.1b-1993, p.225

 */

int sem_unlink(

  const char *name

)

{

  int  status;

  register POSIX_Semaphore_Control *the_semaphore;

  sem_t                        the_semaphore_id;

  _Thread_Disable_dispatch();

  status = _POSIX_Semaphore_Name_to_id( name, &the_semaphore_id );

  if ( status != 0 ) {

    _Thread_Enable_dispatch();

    rtems_set_errno_and_return_minus_one( status );

  }

  /*

   *  Don't support unlinking a remote semaphore.

   */

  if ( !_Objects_Is_local_id(the_semaphore_id) ) {

    _Thread_Enable_dispatch();

    rtems_set_errno_and_return_minus_one( ENOSYS );

  }

  the_semaphore = (POSIX_Semaphore_Control *) _Objects_Get_local_object(

    &_POSIX_Semaphore_Information,

    _Objects_Get_index( the_semaphore_id )

  );

#if defined(RTEMS_MULTIPROCESSING)

  if ( the_semaphore->process_shared == PTHREAD_PROCESS_SHARED ) {

    _Objects_MP_Close( &_POSIX_Semaphore_Information, the_semaphore_id );

  }

#endif

  the_semaphore->linked = FALSE;

  _POSIX_Semaphore_Namespace_remove( the_semaphore );

  _POSIX_Semaphore_Delete( the_semaphore );

  _Thread_Enable_dispatch();

  return 0;

}