evbuffer_write
res = evbuffer_write(bufev->output, fd);
int evbuffer_write(struct evbuffer *, int);
nwrite = evbuffer_write(tty->out, c->fd);
evbuffer_write(s->client_bufev->output, s->client_fd);
evbuffer_write(s->server_bufev->output, s->server_fd);
if (evbuffer_write(child->buf, fd) == -1)
if (evbuffer_write(rwmap->wrbuf, fd) == -1) {