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 3 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, see <http://www.gnu.org/licenses/>.
  17  *
  18  * Contributor(s):
  19  *   Tom Cort <tom.cort@state.vt.us>
  20  */
  21
  22 #include <signal.h>
  23
  24 #include "sig.h"
  25
  26 /**
  27  * Signal handler for SIGKILL, SIGQUIT, SIGINT.
  28  * Raises a SIGUSR1 signal to tell nanohttp to stop.
  29  * @param sig signal to handle.
  30  */
  31 void handle_signal(int sig)
  32 {
  33         switch (sig) {
  34         case SIGKILL:
  35                 exit_now = 1;
  36                 raise(SIGUSR1);
  37                 break;
  38         case SIGQUIT:
  39                 exit_now = 1;
  40                 raise(SIGUSR1);
  41                 break;
  42         case SIGINT:
  43                 exit_now = 1;
  44                 raise(SIGUSR1);
  45                 break;
  46         }
  47 }
  48
  49 /**
  50  *  installs signal handlers (mostly SIG_IGN)
  51  */
  52 void install_signal_handlers()
  53 {
  54         int i;
  55
  56         for (i = 0; i < 32; i++) {
  57                 if (i != SIGCHLD && i != SIGQUIT && i != SIGINT && i != SIGKILL) {
  58                         signal(i, SIG_IGN);
  59                 }
  60         }
  61
  62         signal(SIGKILL, handle_signal);
  63         signal(SIGINT, handle_signal);
  64         signal(SIGQUIT, handle_signal);
  65 }