main(int argc, char * argv[])
{
  struct timeval * tv;
  struct timezone * tz;

  gettimeofday(tv, tz);
  usleep(1000);
  gettimeofday(tv, tz);

  printf("%d", *tv->suseconds_t);
  printf("%d", *tv->suseconds_t);
}

#include <cstdio>  // <1> for printf()
#include <unistd.h>  // <1> for usleep()
#include <sys/time.h>  // <1> for timeval, timezone, and gettimeofday()

int main (int argc, char* argv[])  // <2>
{
    timezone* tz = new timezone;  // <3>
    timeval* tv_before = new timeval;  // <3,4> for timestamp before sleep
    timeval* tv_after = new timeval;  // <3,4> for timestamp after sleep

    gettimeofday (tv_before, tz);  // <4>
    usleep (1000);
    gettimeofday (tv_after, tz);  // <4>

    printf ("%d\n", tv_before->tv_usec);  // <4,5,6,7>
    printf ("%d\n", tv_after->tv_usec);  // <4,5,6,7>

    return 0;  // <8>
}