static int
ptsdev_poll(struct file *fp, int events, struct ucred *active_cred,
struct thread *td)
{
struct tty *tp = fp->f_data;
struct pts_softc *psc = tty_softc(tp);
int revents = 0;
tty_lock(tp);
if (psc->pts_flags & PTS_FINISHED) {
/* Slave device is not opened. */
tty_unlock(tp);
return ((events & (POLLIN|POLLRDNORM)) | POLLHUP);
}
if (events & (POLLIN|POLLRDNORM)) {
/* See if we can getc something. */
if (ttydisc_getc_poll(tp) ||
(psc->pts_flags & PTS_PKT && psc->pts_pkt))
revents |= events & (POLLIN|POLLRDNORM);
}
if (events & (POLLOUT|POLLWRNORM)) {
/* See if we can rint something. */
if (ttydisc_rint_poll(tp))
revents |= events & (POLLOUT|POLLWRNORM);
}
/*
* No need to check for POLLHUP here. This device cannot be used
* as a callout device, which means we always have a carrier,
* because the master is.
*/
if (revents == 0) {
/*
* This code might look misleading, but the naming of
* poll events on this side is the opposite of the slave
* device.
*/
if (events & (POLLIN|POLLRDNORM))
selrecord(td, &psc->pts_outpoll);
if (events & (POLLOUT|POLLWRNORM))
selrecord(td, &psc->pts_inpoll);
}
tty_unlock(tp);
return (revents);
}
static int
pts_kqops_write_event(struct knote *kn, long hint)
{
struct file *fp = kn->kn_fp;
struct tty *tp = fp->f_data;
struct pts_softc *psc = tty_softc(tp);
if (psc->pts_flags & PTS_FINISHED) {
kn->kn_flags |= EV_EOF;
return (1);
} else {
kn->kn_data = ttydisc_rint_poll(tp);
return (kn->kn_data > 0);
}
}
static void
nmdm_task_tty(void *arg, int pending __unused)
{
struct tty *tp, *otp;
struct nmdmpart *np = arg;
char c;
tp = np->np_tty;
tty_lock(tp);
if (tty_gone(tp)) {
tty_unlock(tp);
return;
}
otp = np->np_other->np_tty;
KASSERT(otp != NULL, ("NULL otp in nmdmstart"));
KASSERT(otp != tp, ("NULL otp == tp nmdmstart"));
if (np->np_other->np_dcd) {
if (!tty_opened(tp)) {
np->np_other->np_dcd = 0;
ttydisc_modem(otp, 0);
}
} else {
if (tty_opened(tp)) {
np->np_other->np_dcd = 1;
ttydisc_modem(otp, 1);
}
}
/* This may happen when we are in detach process. */
if (tty_gone(otp)) {
tty_unlock(otp);
return;
}
while (ttydisc_rint_poll(otp) > 0) {
if (np->np_rate && !np->np_quota)
break;
if (ttydisc_getc(tp, &c, 1) != 1)
break;
np->np_quota--;
ttydisc_rint(otp, c, 0);
}
ttydisc_rint_done(otp);
tty_unlock(tp);
}