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 <libdaemon/dlog.h>
  23 #include <signal.h>
  24
  25 #include "sig.h"
  26
  27 /**
  28  * Signal handler for SIGKILL, SIGQUIT, SIGINT.
  29  * Raises a SIGUSR1 signal to tell nanohttp to stop.
  30  * @param sig signal to handle.
  31  */
  32 void handle_signal(int sig)
  33 {
  34         switch (sig) {
  35         case SIGKILL:
  36                 exit_now = 1;
  37                 raise(SIGUSR1);
  38                 break;
  39         case SIGQUIT:
  40                 exit_now = 1;
  41                 raise(SIGUSR1);
  42                 break;
  43         case SIGINT:
  44                 exit_now = 1;
  45                 raise(SIGUSR1);
  46                 break;
  47         }
  48
  49         daemon_log(LOG_INFO, "(%s:%u) Signal Caught ; preparing to exit", __FILE__, __LINE__);
  50 }
  51
  52 /**
  53  *  installs signal handlers (mostly SIG_IGN)
  54  */
  55 void install_signal_handlers()
  56 {
  57         int i;
  58
  59         for (i = 0; i < 32; i++) {
  60                 if (i != SIGCHLD && i != SIGQUIT && i != SIGINT && i != SIGKILL) {
  61                         signal(i, SIG_IGN);
  62                 }
  63         }
  64
  65         signal(SIGKILL, handle_signal);
  66         signal(SIGINT, handle_signal);
  67         signal(SIGQUIT, handle_signal);
  68 }