/* Copyright (C) 2000 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 Library General Public License as
   published by the Free Software Foundation; either version 2 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
   Library General Public License for more details.

   You should have received a copy of the GNU Library General Public
   License along with the GNU C Library; see the file COPYING.LIB.  If not,
   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
   Boston, MA 02111-1307, USA.  */

#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 (timerid, value)
     timer_t timerid;
     struct itimerspec *value;
{
  struct timer_node *timer;
  struct timespec now;
  int retval = -1;

  pthread_mutex_lock (&__timer_mutex);

  timer = timer_id2ptr (timerid);
  if (timer == NULL && !timer->inuse)
    /* Invalid timer ID or the timer is not in use.  */
    errno = EINVAL;
  else
    {
      value->it_interval = timer->value.it_interval;

      if (timer->armed)
	{
	  pthread_mutex_unlock (&__timer_mutex);
	  clock_gettime (timer->clock, &now);
	  pthread_mutex_lock (&__timer_mutex);
	  timespec_sub (&value->it_value, &timer->expirytime, &now);
	}
      else
	{
	  value->it_value.tv_sec = 0;
	  value->it_value.tv_nsec = 0;
	}

      retval = 0;
    }

  pthread_mutex_lock (&__timer_mutex);

  return retval;
}