/* Copyright (C) 2000-2018 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   Contributed by Kaz Kylheku <kaz@ashi.footprints.net>.

   The GNU C Library is free software; you can redistribute it and/or

   modify it under the terms of the GNU Lesser General Public License as

   published by the Free Software Foundation; either version 2.1 of the

   License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,

   but WITHOUT ANY WARRANTY; without even the implied warranty of

   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public

   License along with the GNU C Library; see the file COPYING.LIB.  If

   not, see <http://www.gnu.org/licenses/>.  */

#include <errno.h>

#include <pthread.h>

#include <time.h>

#include "posix-timer.h"

/* Get current value of timer TIMERID and store it in VLAUE.  */

int

timer_gettime (timer_t timerid, struct itimerspec *value)

{

  struct timer_node *timer;

  struct timespec now, expiry;

  int retval = -1, armed = 0, valid;

  clock_t clock = 0;

  pthread_mutex_lock (&__timer_mutex);

  timer = timer_id2ptr (timerid);

  valid = timer_valid (timer);

  if (valid) {

    armed = timer->armed;

    expiry = timer->expirytime;

    clock = timer->clock;

    value->it_interval = timer->value.it_interval;

  }

  pthread_mutex_unlock (&__timer_mutex);

  if (valid)

    {

      if (armed)

	{

	  __clock_gettime (clock, &now;;

	  if (timespec_compare (&now, &expiry) < 0)

	    timespec_sub (&value->it_value, &expiry, &now;;

	  else

	    {

	      value->it_value.tv_sec = 0;

	      value->it_value.tv_nsec = 0;

	    }

	}

      else

	{

	  value->it_value.tv_sec = 0;

	  value->it_value.tv_nsec = 0;

	}

      retval = 0;

    }

  else

    __set_errno (EINVAL);

  return retval;

}