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/*

 *  3.3.5 Examine and Change Blocked Signals, P1003.1b-1993, p. 73

 *

 *  NOTE: P1003.1c/D10, p. 37 adds pthread_sigmask().

 *

 *  COPYRIGHT (c) 1989-1999.

 *  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.OARcorp.com/rtems/license.html.

 *

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

 */

#include <pthread.h>

#include <signal.h>

#include <errno.h>

#include <rtems/system.h>

#include <rtems/posix/pthread.h>

#include <rtems/posix/psignal.h>

#include <rtems/posix/seterr.h>

int pthread_sigmask(

  int               how,

  const sigset_t   *set,

  sigset_t         *oset

)

{

  POSIX_API_Control  *api;

  if ( !set && !oset )

    set_errno_and_return_minus_one( EINVAL );

  api = _Thread_Executing->API_Extensions[ THREAD_API_POSIX ];

  if ( oset )

    *oset = api->signals_blocked;

  if ( !set )

    return 0;

  switch ( how ) {

    case SIG_BLOCK:

      api->signals_blocked |= *set;

      break;

    case SIG_UNBLOCK:

      api->signals_blocked &= ~*set;

      break;

    case SIG_SETMASK:

      api->signals_blocked = *set;

      break;

    default:

      set_errno_and_return_minus_one( EINVAL );

  }

  /* XXX are there critical section problems here? */

  /* XXX evaluate the new set */

  if ( ~api->signals_blocked &

       (api->signals_pending | _POSIX_signals_Pending) ) {

    _Thread_Executing->do_post_task_switch_extension = TRUE;

    _Thread_Dispatch();

  }

  return 0;

}