| 1 | // ex 2.1 |
| 2 | @@ |
| 3 | @@ |
| 4 | |
| 5 | int do_setitimer(int which, struct itimerval *value, |
| 6 | struct itimerval *ovalue) |
| 7 | { |
| 8 | unsigned long expire; |
| 9 | cputime_t cputime; |
| 10 | int k; |
| 11 | if (ovalue && (k = do_getitimer(which, ovalue)) < 0) |
| 12 | return k; |
| 13 | switch (which) { |
| 14 | // work even when reversed case |
| 15 | case ITIMER_PROF: |
| 16 | cputime = timeval_to_cputime(&value->it_value); |
| 17 | if (cputime_eq(cputime, cputime_zero)) |
| 18 | cputime = jiffies_to_cputime(1); |
| 19 | current->it_prof_value = cputime; |
| 20 | cputime = timeval_to_cputime(&value->it_interval); |
| 21 | - current->it_prof_incr = cputime; |
| 22 | + B; |
| 23 | break; |
| 24 | case ITIMER_VIRTUAL: |
| 25 | cputime = timeval_to_cputime(&value->it_value); |
| 26 | if (cputime_eq(cputime, cputime_zero)) |
| 27 | cputime = jiffies_to_cputime(1); |
| 28 | current->it_virt_value = cputime; |
| 29 | - cputime = timeval_to_cputime(&value->it_interval); |
| 30 | + A; |
| 31 | current->it_virt_incr = cputime; |
| 32 | break; |
| 33 | default: |
| 34 | return -EINVAL; |
| 35 | } |
| 36 | return 0; |
| 37 | } |