relay_bufferevent_add
relay_bufferevent_add(&bufev->ev_read, bufev->timeout_read);
relay_bufferevent_add(&bufev->ev_read, bufev->timeout_read);
relay_bufferevent_add(&bufev->ev_write, bufev->timeout_write);
relay_bufferevent_add(&bufev->ev_write, bufev->timeout_write);
int relay_bufferevent_add(struct event *, int);