Function box_keeper

isolate.c:585–684

}

static void
box_keeper(void)
{
  read_errors_from_fd = error_pipes[0];
  close(error_pipes[1]);
  close(status_pipes[1]);

  clock_gettime(CLOCK_MONOTONIC, &start_time);
  ticks_per_sec = sysconf(_SC_CLK_TCK);
  if (ticks_per_sec <= 0)
    die("Invalid ticks_per_sec!");

  if (timeout || wall_timeout)
    {
      struct sigaction sa;
      bzero(&sa, sizeof(sa));
      sa.sa_handler = signal_alarm;
      sigaction(SIGALRM, &sa, NULL);
      struct itimerval timer = {
	.it_interval = { .tv_usec = TIMER_INTERVAL_US },
	.it_value = { .tv_usec = TIMER_INTERVAL_US },
      };
      setitimer(ITIMER_REAL, &timer, NULL);
    }

  for(;;)
    {
      struct rusage rus;
      int stat;
      pid_t p;
      if (interrupt)
	{
	  meta_printf("exitsig:%d\n", interrupt);
	  err("SG: Interrupted");
	}
      if (timer_tick)
	{
	  check_timeout();
	  timer_tick = 0;
	}
      p = wait4(proxy_pid, &stat, 0, &rus);
      if (p < 0)
	{
	  if (errno == EINTR)
	    continue;
	  die("wait4: %m");
	}
      if (p != proxy_pid)
	die("wait4: unknown pid %d exited!", p);
      proxy_pid = 0;

      // Check error pipe if there is an internal error passed from inside the box
      char interr[1024];
      int n = read(read_errors_from_fd, interr, sizeof(interr) - 1);
      if (n > 0)
	{
	  interr[n] = 0;
	  die("%s", interr);