sioctl_pollfd
int sioctl_pollfd(struct sioctl_hdl *, struct pollfd *, int);
n = sioctl_pollfd(hdl, pfds, POLLIN);
nfds = sioctl_pollfd(hdl, pfds, event);
nfds = sioctl_pollfd(hdl, pfds, POLLIN);
return sioctl_pollfd(d->sioctl.hdl, pfd, events);