EV_ADD
assert((mevp->me_state & EV_ADD) == 0);
mevp->me_state &= ~EV_ADD;
return (mevent_add_state(tfd, type, func, param, EV_ADD, 0));
return (mevent_add_state(tfd, type, func, param, EV_ADD, fflags));
return (mevent_add_state(tfd, type, func, param, EV_ADD | EV_DISABLE, 0));
EV_SET(&svr->ev_kev[i], s, EVFILT_READ, EV_ADD | EV_ENABLE, 0,