Dogcows Code - chaz/tint2/blob - src/util/timer.c

   1 /**************************************************************************
   2 *
   3 * Copyright (C) 2009 Andreas.Fink (Andreas.Fink85@gmail.com)
   4 *
   5 * This program is free software; you can redistribute it and/or
   6 * modify it under the terms of the GNU General Public License version 2
   7 * as published by the Free Software Foundation.
   8 *
   9 * This program 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
  12 * GNU General Public License for more details.
  13 * You should have received a copy of the GNU General Public License
  14 * along with this program; if not, write to the Free Software
  15 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  16 **************************************************************************/
  17
  18 #include <sys/timerfd.h>
  19 #include <stdlib.h>
  20 #include <unistd.h>
  21
  22 #include "timer.h"
  23
  24 GSList* timer_list = 0;
  25
  26 int install_timer(int value_sec, int value_nsec, int interval_sec, int interval_nsec, void (*_callback)())
  27 {
  28         if ( value_sec < 0 || interval_sec < 0 || _callback == 0 )
  29                 return -1;
  30
  31         int timer_fd;
  32         struct itimerspec timer;
  33         timer.it_value = (struct timespec){ .tv_sec=value_sec, .tv_nsec=value_nsec };
  34         timer.it_interval = (struct timespec){ .tv_sec=interval_sec, .tv_nsec=interval_nsec };
  35         timer_fd = timerfd_create(CLOCK_MONOTONIC, 0);
  36         timerfd_settime(timer_fd, 0, &timer, 0);
  37         struct timer* t = malloc(sizeof(struct timer));
  38         t->id=timer_fd;
  39         t->_callback = _callback;
  40         timer_list = g_slist_prepend(timer_list, t);
  41         return timer_fd;
  42 }
  43
  44
  45 void reset_timer(int id, int value_sec, int value_nsec, int interval_sec, int interval_nsec)
  46 {
  47         struct itimerspec timer;
  48         timer.it_value = (struct timespec){ .tv_sec=value_sec, .tv_nsec=value_nsec };
  49         timer.it_interval = (struct timespec){ .tv_sec=interval_sec, .tv_nsec=interval_nsec };
  50         timerfd_settime(id, 0, &timer, 0);
  51 }
  52
  53
  54 void uninstall_timer(int id)
  55 {
  56         close(id);
  57         GSList* timer_iter = timer_list;
  58         while (timer_iter) {
  59                 struct timer* t = timer_iter->data;
  60                 if (t->id == id) {
  61                         timer_list = g_slist_remove(timer_list, t);
  62                         free(t);
  63                         return;
  64                 }
  65                 timer_iter = timer_iter->next;
  66         }
  67 }