writecb
if (bufev->writecb != NULL &&
(*bufev->writecb)(bufev, bufev->cbarg);
bufferevent_new(int fd, evbuffercb readcb, evbuffercb writecb,
bufferevent_setcb(bufev, readcb, writecb, errorcb, cbarg);
evbuffercb readcb, evbuffercb writecb, everrorcb errorcb, void *cbarg)
bufev->writecb = writecb;
evbuffercb writecb;
evbuffercb readcb, evbuffercb writecb, everrorcb errorcb, void *cbarg);
evbuffercb readcb, evbuffercb writecb, everrorcb errorcb, void *cbarg);
bev1 = bufferevent_new(pair[0], readcb, writecb, errorcb, NULL);
bev2 = bufferevent_new(pair[1], readcb, writecb, errorcb, NULL);
if (bufev->writecb != NULL &&
(*bufev->writecb)(bufev, bufev->cbarg);
if (bufev->writecb != NULL &&
(*bufev->writecb)(bufev, bufev->cbarg);
if (bufev->writecb != NULL &&
(*bufev->writecb)(bufev, bufev->cbarg);
if (bufev->writecb != NULL &&
(*bufev->writecb)(bufev, bufev->cbarg);