| 791 | } |
| 792 | |
| 793 | static void |
| 794 | filt_timertouch(struct knote *kn, struct kevent *kev, u_long type) |
| 795 | { |
| 796 | struct kq_timer_cb_data *kc; |
| 797 | struct kqueue *kq; |
| 798 | sbintime_t to; |
| 799 | int error; |
| 800 | |
| 801 | switch (type) { |
| 802 | case EVENT_REGISTER: |
| 803 | /* Handle re-added timers that update data/fflags */ |
| 804 | if (kev->flags & EV_ADD) { |
| 805 | kc = kn->kn_ptr.p_v; |
| 806 | |
| 807 | /* Drain any existing callout. */ |
| 808 | callout_drain(&kc->c); |
| 809 | |
| 810 | /* Throw away any existing undelivered record |
| 811 | * of the timer expiration. This is done under |
| 812 | * the presumption that if a process is |
| 813 | * re-adding this timer with new parameters, |
| 814 | * it is no longer interested in what may have |
| 815 | * happened under the old parameters. If it is |
| 816 | * interested, it can wait for the expiration, |
| 817 | * delete the old timer definition, and then |
| 818 | * add the new one. |
| 819 | * |
| 820 | * This has to be done while the kq is locked: |
| 821 | * - if enqueued, dequeue |
| 822 | * - make it no longer active |
| 823 | * - clear the count of expiration events |
| 824 | */ |
| 825 | kq = kn->kn_kq; |
| 826 | KQ_LOCK(kq); |
| 827 | if (kn->kn_status & KN_QUEUED) |
| 828 | knote_dequeue(kn); |
| 829 | |
| 830 | kn->kn_status &= ~KN_ACTIVE; |
| 831 | kn->kn_data = 0; |
| 832 | KQ_UNLOCK(kq); |
| 833 | |
| 834 | /* Reschedule timer based on new data/fflags */ |
| 835 | kn->kn_sfflags = kev->fflags; |
| 836 | kn->kn_sdata = kev->data; |
| 837 | error = filt_timervalidate(kn, &to); |
| 838 | if (error != 0) { |
| 839 | kn->kn_flags |= EV_ERROR; |
| 840 | kn->kn_data = error; |
| 841 | } else |
| 842 | filt_timerstart(kn, to); |
| 843 | } |
| 844 | break; |
| 845 | |
| 846 | case EVENT_PROCESS: |
| 847 | *kev = kn->kn_kevent; |
| 848 | if (kn->kn_flags & EV_CLEAR) { |
| 849 | kn->kn_data = 0; |
| 850 | kn->kn_fflags = 0; |
nothing calls this directly
no test coverage detected