sio_revents
int sio_revents(struct sio_hdl *, struct pollfd *);
revents = sio_revents(hdl, pfd);
revents = sio_revents(hdl, pfd);
if (sio_revents(hdl, &pfd[1]) & POLLOUT) {
ev = sio_revents(dev_sh, pfds);
events = sio_revents(d->sio.hdl, pfd);