event_pending
if (event_pending(&bufev->ev_read, EV_READ, NULL))
if (event_pending(&bufev->ev_write, EV_WRITE, NULL))
#define evtimer_pending(ev, tv) event_pending(ev, EV_TIMEOUT, tv)
#define timeout_pending(ev, tv) event_pending(ev, EV_TIMEOUT, tv)
#define signal_pending(ev, tv) event_pending(ev, EV_SIGNAL, tv)
int event_pending(struct event *ev, short event, struct timeval *tv);
!event_pending(&tty->event_out, EV_WRITE, NULL))
event_pending(&nbr->ev_connect, EV_WRITE, NULL))
if (!event_pending(&control_state.ev, EV_READ, NULL)) {