src/signal_check.c

   1 /* the Music Player Daemon (MPD)
   2  * Copyright (C) 2003-2007 by Warren Dukes (warren.dukes@gmail.com)
   3  * (c)2004 by mackstann
   4  * This project's homepage is: http://www.musicpd.org
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  18  */
  19
  20 #include "signal_check.h"
  21 #include "os_compat.h"
  22
  23 static volatile sig_atomic_t caught_signals[NSIG];
  24
  25 static void mpd_signal_handler(int sig)
  26 {
  27         caught_signals[sig] = 1;
  28 }
  29
  30 static void set_signal_handler(int sig, void (*handler) (int))
  31 {
  32         struct sigaction act;
  33         act.sa_flags = 0;
  34         sigemptyset(&act.sa_mask);
  35         act.sa_handler = handler;
  36         while (sigaction(sig, &act, NULL) && errno == EINTR) ;
  37 }
  38
  39 void signal_handle(int sig)
  40 {
  41         set_signal_handler(sig, mpd_signal_handler);
  42 }
  43
  44 void signal_unhandle(int sig)
  45 {
  46         signal_clear(sig);
  47         set_signal_handler(sig, SIG_DFL);
  48 }
  49
  50 int signal_is_pending(int sig)
  51 {
  52         return caught_signals[sig];
  53 }
  54
  55 void signal_clear(int sig)
  56 {
  57         caught_signals[sig] = 0;
  58 }