sig.c

   1 /*
   2  * inoclam - Inotify+ClamAV virus scanner
   3  * Copyright (C) 2007 Vermont Department of Taxes
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  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  * Contributor(s):
  20  *   Tom Cort <tom.cort@state.vt.us>
  21  */
  22
  23 #include <libdaemon/dlog.h>
  24 #include <signal.h>
  25
  26 #include "sig.h"
  27
  28 /**
  29  * Signal handler for SIGKILL, SIGQUIT, SIGINT.
  30  * Raises a SIGUSR1 signal to tell nanohttp to stop.
  31  * @param sig signal to handle.
  32  */
  33 void handle_signal(int sig)
  34 {
  35         switch (sig) {
  36         case SIGKILL:
  37                 exit_now = 1;
  38                 raise(SIGUSR1);
  39                 break;
  40         case SIGQUIT:
  41                 exit_now = 1;
  42                 raise(SIGUSR1);
  43                 break;
  44         case SIGINT:
  45                 exit_now = 1;
  46                 raise(SIGUSR1);
  47                 break;
  48         }
  49
  50         daemon_log(LOG_INFO, "(%s:%u) Signal Caught ; preparing to exit", __FILE__, __LINE__);
  51 }
  52
  53 /**
  54  *  installs signal handlers (mostly SIG_IGN)
  55  */
  56 void install_signal_handlers()
  57 {
  58         int i;
  59
  60         for (i = 0; i < 32; i++) {
  61                 if (i != SIGCHLD && i != SIGQUIT && i != SIGINT && i != SIGKILL) {
  62                         signal(i, SIG_IGN);
  63                 }
  64         }
  65
  66         signal(SIGKILL, handle_signal);
  67         signal(SIGINT, handle_signal);
  68         signal(SIGQUIT, handle_signal);
  69 }