#include <stdio.h>
#include <signal.h>
#include <sys/time.h>

static void sigalrm(int sig __attribute__((__unused__)))
{
}

int main(void);
int main(void)
{
 struct itimerval itv;
 struct timeval last;
 struct timeval now;
 int delta;

 itv.it_value.tv_sec = 0;
 itv.it_value.tv_usec = 1000000 / 100;
 itv.it_interval = itv.it_value;
 signal(SIGALRM,sigalrm);
 setitimer(ITIMER_REAL,&itv,0);
 gettimeofday(&now,0);
 while (1)
  { last = now;
    sigpause(0);
    gettimeofday(&now,0);
    delta = 1000000 * (int)(now.tv_sec-last.tv_sec);
    delta += (int)now.tv_usec - (int)last.tv_usec;
    printf("%d\n",delta);
    fflush(stdout);
  }
}