demos/itimer.c

   1 int do_setitimer(int which, struct itimerval *value,
   2                  struct itimerval *ovalue)
   3 {
   4    unsigned long expire;
   5    cputime_t cputime;
   6    int k;
   7    if (ovalue && (k = do_getitimer(which, ovalue)) < 0)
   8      return k;
   9    switch (which) {
  10      case ITIMER_VIRTUAL:
  11        cputime = timeval_to_cputime(&value->it_value);
  12       if (cputime_eq(cputime, cputime_zero))
  13           cputime = jiffies_to_cputime(1);
  14        current->it_virt_value = cputime;
  15        cputime = timeval_to_cputime(&value->it_interval);
  16        current->it_virt_incr = cputime;
  17        break;
  18      case ITIMER_PROF:
  19        cputime = timeval_to_cputime(&value->it_value);
  20         if (cputime_eq(cputime, cputime_zero))
  21             cputime = jiffies_to_cputime(1);
  22          current->it_prof_value = cputime;
  23          cputime = timeval_to_cputime(&value->it_interval);
  24          current->it_prof_incr = cputime;
  25          break;
  26        default:
  27          return -EINVAL;
  28    }
  29    return 0;
  30 }