src/signals.c

   1 #define _GNU_SOURCE
   2 #include <stdio.h>
   3
   4 #include <signal.h>
   5
   6 #include <string.h>
   7
   8 void invoke_atexit_functions(void);
   9
  10 static void terminate(int signum)
  11 {
  12   invoke_atexit_functions();
  13   fprintf(stderr, "vlock: Killed by signal %d (%s)!\n", signum, strsignal(signum));
  14   raise(signum);
  15 }
  16
  17 void install_signal_handlers(void)
  18 {
  19   struct sigaction sa;
  20
  21   /* Ignore some signals. */
  22   (void) sigemptyset(&(sa.sa_mask));
  23   sa.sa_flags = SA_RESTART;
  24   sa.sa_handler = SIG_IGN;
  25   (void) sigaction(SIGTSTP, &sa, NULL);
  26
  27   /* Handle termination signals.  None of these should be delivered in a normal
  28    * run of the program because terminal signals (INT, QUIT) are disabled
  29    * below. */
  30   sa.sa_flags = SA_RESETHAND;
  31   sa.sa_handler = terminate;
  32   (void) sigaction(SIGINT, &sa, NULL);
  33   (void) sigaction(SIGQUIT, &sa, NULL);
  34   (void) sigaction(SIGTERM, &sa, NULL);
  35   (void) sigaction(SIGHUP, &sa, NULL);
  36   (void) sigaction(SIGABRT, &sa, NULL);
  37   (void) sigaction(SIGSEGV, &sa, NULL);
  38 }