rt/timer_getoverr.c

   1 /* Copyright (C) 2000-2021 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Kaz Kylheku <kaz@ashi.footprints.net>.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public License as
   7    published by the Free Software Foundation; either version 2.1 of the
   8    License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; see the file COPYING.LIB.  If
  17    not, see <https://www.gnu.org/licenses/>.  */
  18
  19 #include <errno.h>
  20 #include <pthread.h>
  21 #include <time.h>
  22
  23 #include "posix-timer.h"
  24
  25
  26 /* Get expiration overrun for timer TIMERID.  */
  27 int
  28 timer_getoverrun (timer_t timerid)
  29 {
  30   struct timer_node *timer;
  31   int retval = -1;
  32
  33   pthread_mutex_lock (&__timer_mutex);
  34
  35   if (! timer_valid (timer = timer_id2ptr (timerid)))
  36     __set_errno (EINVAL);
  37   else
  38     retval = timer->overrun_count;
  39
  40   pthread_mutex_unlock (&__timer_mutex);
  41
  42   return retval;
  43 }