rt/timer_getoverr.c

   1 /* Copyright (C) 2000-2023 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public License as
   6    published by the Free Software Foundation; either version 2.1 of the
   7    License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; see the file COPYING.LIB.  If
  16    not, see <https://www.gnu.org/licenses/>.  */
  17
  18 #include <errno.h>
  19 #include <pthread.h>
  20 #include <time.h>
  21
  22 #include "posix-timer.h"
  23
  24
  25 /* Get expiration overrun for timer TIMERID.  */
  26 int
  27 timer_getoverrun (timer_t timerid)
  28 {
  29   struct timer_node *timer;
  30   int retval = -1;
  31
  32   pthread_mutex_lock (&__timer_mutex);
  33
  34   if (! timer_valid (timer = timer_id2ptr (timerid)))
  35     __set_errno (EINVAL);
  36   else
  37     retval = timer->overrun_count;
  38
  39   pthread_mutex_unlock (&__timer_mutex);
  40
  41   return retval;
  42 }