EVFILT_USER
{ "EVFILT_USER", EVFILT_USER, 0, &user_filtops, 0 },
EV_SET(&ev, 666, EVFILT_USER, EV_ADD | EV_ENABLE, 0, 0, 0);
EV_SET(&ev, 666, EVFILT_USER, 0, NOTE_FFCOPY | NOTE_TRIGGER | 8, 0, 0);
ATF_REQUIRE(rev.filter == EVFILT_USER);