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

#define N (60 * 100)
static volatile struct timeval tvbuf[N];
static volatile int tvx;

static void handle(int sig __attribute__((__unused__)))
{
 struct timeval tv;
 int i;

 i = tvx;
 if (i < N)
  { gettimeofday(&tv,0);
    tvbuf[i] = tv;
    tvx = i + 1;
  }
}

int main(void)
{
 struct sigaction sa;
 struct itimerval itv;
 sigset_t m;
 int i;
 struct timeval tv;

 tvx = 0;
 sa.sa_handler = &handle;
 sigemptyset(&sa.sa_mask);
 sa.sa_flags = 0;
 sigaction(SIGALRM,&sa,0);
 itv.it_interval.tv_sec = 0;
 itv.it_interval.tv_usec = 10000;
 itv.it_value = itv.it_interval;
 setitimer(ITIMER_REAL,&itv,0);
 sigemptyset(&m);
 while (tvx < N) sigsuspend(&m);
 for (i=0;i<N;i++)
  { tv = tvbuf[i];
    printf("%llu.%06lu\n",(unsigned long long int)tv.tv_sec,(unsigned long int)tv.tv_usec);
  }
 return(0);
}