evbuffer_read
res = evbuffer_read(bufev->input, fd, howmuch);
int evbuffer_read(struct evbuffer *, int, int);
nread = evbuffer_read(tty->in, c->fd, -1);
switch (evbuffer_read(p->buf, fd, sizeof(req))) {
switch (evbuffer_read(rwmap->rdbuf, fd, PATH_MAX)) {