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int do_work(int seconds_to_work) {
  time_t start;
  start = time();

  if (start == (time_t)(-1)) {
    /* Handle error */
  }
  while (time() < start + second_to_work) {
    do_some_work();
  }
}

int do_work(int seconds_to_work) {
  time_t start,;
  time_t current;
  start = time();
  current = start;

  if (start == (time_t)(-1)) {
    /* Handle error */
  }
  while (timedifftime(current, start) < start + secondseconds_to_work) {
    current = time();
    if (current == (time_t)(-1)) {
       /* Handle error */
    }
    if (difftime(current, start) >= seconds_to_work)
      break;
    do_some_work();
  }
}