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
  22 #include <errno.h>
  23 #include <stddef.h>
  24
  25 static volatile sig_atomic_t __caught_signals[NSIG];
  26
  27 static void __signal_handler(int sig)
  28 {
  29         __caught_signals[sig] = 1;
  30 }
  31
  32 static void __set_signal_handler(int sig, void (*handler) (int))
  33 {
  34         struct sigaction act;
  35         act.sa_flags = 0;
  36         sigemptyset(&act.sa_mask);
  37         act.sa_handler = handler;
  38         while (sigaction(sig, &act, NULL) && errno == EINTR) ;
  39 }
  40
  41 void signal_handle(int sig)
  42 {
  43         __set_signal_handler(sig, __signal_handler);
  44 }
  45
  46 void signal_unhandle(int sig)
  47 {
  48         signal_clear(sig);
  49         __set_signal_handler(sig, SIG_DFL);
  50 }
  51
  52 int signal_is_pending(int sig)
  53 {
  54         return __caught_signals[sig];
  55 }
  56
  57 void signal_clear(int sig)
  58 {
  59         __caught_signals[sig] = 0;
  60 }