source: rtems/cpukit/posix/src/clockgettime.c @ aff220d

/**
 * @file
 *
 * @brief Retrieves the Specified Clock Time
 * @ingroup POSIXAPI
 */

/*
 *  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.org/license/LICENSE.
 */

#if HAVE_CONFIG_H
#include "config.h"
#endif

#include <time.h>
#include <errno.h>

#include <rtems/score/todimpl.h>
#include <rtems/seterr.h>

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

int clock_gettime(
  clockid_t        clock_id,
  struct timespec *tp
)
{
  if ( !tp )
    rtems_set_errno_and_return_minus_one( EINVAL );

  if ( clock_id == CLOCK_REALTIME ) {
    _TOD_Get_as_timespec(tp);
    return 0;
  }
#ifdef CLOCK_MONOTONIC
  if ( clock_id == CLOCK_MONOTONIC ) {
    _TOD_Get_zero_based_uptime_as_timespec( tp );
    --tp->tv_sec;
    return 0;
  }
#endif

#ifdef _POSIX_CPUTIME
  if ( clock_id == CLOCK_PROCESS_CPUTIME_ID ) {
    _TOD_Get_zero_based_uptime_as_timespec( tp );
    --tp->tv_sec;
    return 0;
  }
#endif

#ifdef _POSIX_THREAD_CPUTIME
  if ( clock_id == CLOCK_THREAD_CPUTIME_ID )
    rtems_set_errno_and_return_minus_one( ENOSYS );
#endif

  rtems_set_errno_and_return_minus_one( EINVAL );

  return 0;
}