/*
 * ovenSigHandler:
 * setupSigHandlers:
 *      Something has happened that would normally terminate the program so make
 *      sure the oven is turned off and exit anyway.
 *********************************************************************************
 */

void ovenSigHandler (int sig)
{
  turnOvenOff () ;
  ledOff      () ;

  printf ("\n") ;
  printf ("Oven controller exiting on signal %d\n", sig) ;
  exit (0) ;
}

void setupSigHandler (void)
{
  struct sigaction action ;

  sigemptyset (&action.sa_mask) ;
  action.sa_flags = 0 ;

// Ignore what we can

  action.sa_handler = SIG_IGN ;

  sigaction (SIGHUP,  &action, NULL) ;
  sigaction (SIGTTIN, &action, NULL) ;
  sigaction (SIGTTOU, &action, NULL) ;

// Trap what we can to exit gracefully

  action.sa_handler = ovenSigHandler ;

  sigaction (SIGINT,  &action, NULL) ;
  sigaction (SIGQUIT, &action, NULL) ;
  sigaction (SIGILL,  &action, NULL) ;
  sigaction (SIGABRT, &action, NULL) ;
  sigaction (SIGFPE,  &action, NULL) ;
  sigaction (SIGSEGV, &action, NULL) ;
  sigaction (SIGPIPE, &action, NULL) ;
  sigaction (SIGALRM, &action, NULL) ;
  sigaction (SIGTERM, &action, NULL) ;
  sigaction (SIGUSR1, &action, NULL) ;
  sigaction (SIGUSR2, &action, NULL) ;
  sigaction (SIGCHLD, &action, NULL) ;
  sigaction (SIGTSTP, &action, NULL) ;
  sigaction (SIGBUS,  &action, NULL) ;
}