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 #include <fcntl.h>
  22
  23 #include "timer.h"
  24
  25 GSList* timer_list = 0;
  26
  27 int install_timer(int value_sec, int value_nsec, int interval_sec, int interval_nsec, void (*_callback)())
  28 {
  29         if ( value_sec < 0 || interval_sec < 0 || _callback == 0 )
  30                 return -1;
  31
  32         int timer_fd;
  33         struct itimerspec timer;
  34         timer.it_value = (struct timespec){ .tv_sec=value_sec, .tv_nsec=value_nsec };
  35         timer.it_interval = (struct timespec){ .tv_sec=interval_sec, .tv_nsec=interval_nsec };
  36         timer_fd = timerfd_create(CLOCK_MONOTONIC, 0);
  37         timerfd_settime(timer_fd, 0, &timer, 0);
  38         struct timer* t = malloc(sizeof(struct timer));
  39         t->id=timer_fd;
  40         t->_callback = _callback;
  41         timer_list = g_slist_prepend(timer_list, t);
  42
  43         int flags = fcntl( timer_fd, F_GETFL, 0 );
  44         if( flags != -1 )
  45                 fcntl( timer_fd, F_SETFL, flags | O_NONBLOCK );
  46
  47         return timer_fd;
  48 }
  49
  50
  51 void reset_timer(int id, int value_sec, int value_nsec, int interval_sec, int interval_nsec)
  52 {
  53         struct itimerspec timer;
  54         timer.it_value = (struct timespec){ .tv_sec=value_sec, .tv_nsec=value_nsec };
  55         timer.it_interval = (struct timespec){ .tv_sec=interval_sec, .tv_nsec=interval_nsec };
  56         timerfd_settime(id, 0, &timer, 0);
  57 }
  58
  59
  60 void uninstall_timer(int id)
  61 {
  62         close(id);
  63         GSList* timer_iter = timer_list;
  64         while (timer_iter) {
  65                 struct timer* t = timer_iter->data;
  66                 if (t->id == id) {
  67                         timer_list = g_slist_remove(timer_list, t);
  68                         free(t);
  69                         return;
  70                 }
  71                 timer_iter = timer_iter->next;
  72         }
  73 }