#include <signal.h>

#include <stdio.h>

#include <stdlib.h>

#include <time.h>

#include <unistd.h>

#include <stdint.h>

volatile int gotit = 0;

static void

alarm_handler (int signal)

{

    gotit = 1;

}

int

main (int argc, char ** argv)

{

  clock_t start, stop;

  if (signal(SIGALRM, alarm_handler) == SIG_ERR)

    {

      perror ("signal");

      exit (1);

    }

  alarm(1);

  start = clock ();

  while (!gotit);

  stop = clock ();

  printf ("%jd clock ticks per second (start=%jd,stop=%jd)\n",

	  (intmax_t) (stop - start), (intmax_t) start, (intmax_t) stop);

  printf ("CLOCKS_PER_SEC=%jd, sysconf(_SC_CLK_TCK)=%ld\n",

	  (intmax_t) CLOCKS_PER_SEC, sysconf(_SC_CLK_TCK));

  return 0;

}