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/*

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

 */

#include <assert.h>

#include <time.h>

#include <errno.h>

#include <rtems/system.h>

#include <rtems/score/isr.h>

#include <rtems/score/thread.h>

#include <rtems/score/tod.h>

#include <rtems/posix/seterr.h>

#include <rtems/posix/time.h>

/*PAGE

 *

 *  14.2.1 Clocks, P1003.1b-1993, p. 263

 */

int clock_getres(

  clockid_t        clock_id,

  struct timespec *res

)

{

  if ( !res )

    set_errno_and_return_minus_one( EINVAL );

  switch ( clock_id ) {

    /*

     *  All time in rtems is based on the same clock tick.

     */

    case CLOCK_REALTIME:

    case CLOCK_PROCESS_CPUTIME:

    case CLOCK_THREAD_CPUTIME:

      if ( res )

        _POSIX_Interval_to_timespec( _TOD_Microseconds_per_tick, res );

      break;

    default:

      set_errno_and_return_minus_one( EINVAL );

  }

  return 0;

}