#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <signal.h>
#include "time.h" 		/* gnulib time.h */
#include <setjmp.h>

#define TIME_CHECK_DELTA 10000
#define TIME_CHECK_RANGE 120000

static jmp_buf buf;
static time_t orig_large_time = -67768038400770896;
static time_t large_time =      -67768038400770896;

/* time_find.c */

int localtime_hang_handler () {
  printf ("Hang detected for %ld\n", (long) large_time);
  longjmp(buf, 1);
}

int main () {
  struct tm output_time;
  signal (SIGALRM, (void *) localtime_hang_handler);

  if(setjmp(buf))
  next:
    large_time = large_time + TIME_CHECK_DELTA;
  alarm(1);

  localtime_r (&large_time, &output_time);
  printf ("No hang for       %ld\n", (long) large_time);
  alarm(0);

  if (large_time < (orig_large_time + TIME_CHECK_RANGE)) {
    goto next;
  }

  return 0;
}