#include <stdio.h>
#include <stdint.h>
#include <time.h>
#include <unistd.h>
#include <sys/time.h>

static void print_tod(const struct timeval *tv, const struct timezone *tz)
{
  if (tv)
    printf(" tv=%10ld.%06ld us",
	   tv->tv_sec, tv->tv_usec);
  else
    fputs(" (tv null)", stdout);
  if (tz)
    printf(" tz=%d/%d",
	   tz->tz_minuteswest, tz->tz_dsttime);
  else
    fputs(" (tz null)", stdout);
  fputc('\n', stdout);
}

static time_t t1, t2;
static struct timeval tv1, tv2;
static struct timezone tz1, tz2;

int main(void)
{
  int ret;

  fputs("Checking vtime with NULL param\n", stdout);
  t1 = time(NULL);
  printf("  %ld\n", t1);
  sleep(1);
  t2 = time(NULL);
  printf("  %ld (should be t1 + 1)\n", t2);

  fputs("Checking vtime with non NULL param\n", stdout);
  time(&t1);
  printf("  %ld\n", t1);
  sleep(1);
  time(&t2);
  printf("  %ld (should be t1 + 1)\n", t2);
  fputc('\n', stdout);


  fputs("Checking gettimeofday\n", stdout);
  ret = gettimeofday(&tv1, &tz1);
  printf("  ret=%d", ret);
  print_tod(&tv1, &tz1);
  sleep(1);
  ret = gettimeofday(&tv2, &tz2);
  printf("  ret=%d", ret);
  print_tod(&tv2, &tz2);

  fputs("Checking gettimeofday (tv NULL)\n", stdout);
  ret = gettimeofday(NULL, &tz1);
  printf("  ret=%d", ret);
  print_tod(NULL, &tz1);
  sleep(1);
  ret = gettimeofday(NULL, &tz2);
  printf("  ret=%d", ret);
  print_tod(NULL, &tz2);

  fputs("Checking gettimeofday (tz NULL)\n", stdout);
  ret = gettimeofday(&tv1, NULL);
  printf("  ret=%d", ret);
  print_tod(&tv1, NULL);
  sleep(1);
  ret = gettimeofday(&tv2, NULL);
  printf("  ret=%d", ret);
  print_tod(&tv2, NULL);

  fputs("Checking gettimeofday (tv and tz NULL)\n", stdout);
  ret = gettimeofday(NULL, NULL);
  printf("  ret=%d", ret);
  print_tod(NULL, NULL);
  sleep(1);
  ret = gettimeofday(NULL, NULL);
  printf("  ret=%d", ret);
  print_tod(NULL, NULL);

  return 0;
}