+ splx(s);
+}
+
+/*
+ * This gets called when a received packet is placed on
+ * the inq, at splsoftnet.
+ */
+static void
+pppasyncctlp(sc)
+ struct ppp_softc *sc;
+{
+ struct tty *tp;
+ int s;
+
+ /* Put a placeholder byte in canq for ttselect()/ttnread(). */
+ s = spltty();
+ tp = (struct tty *) sc->sc_devp;
+ putc(0, &tp->t_canq);
+ ttwakeup(tp);
+ splx(s);
+}
+
+/*
+ * Start output on async tty interface. If the transmit queue
+ * has drained sufficiently, arrange for pppasyncstart to be
+ * called later at splsoftnet.
+ * Called at spltty or higher.
+ */
+int
+pppstart(tp)
+ register struct tty *tp;
+{
+ register struct ppp_softc *sc = (struct ppp_softc *) tp->t_sc;
+
+ /*
+ * If there is stuff in the output queue, send it now.
+ * We are being called in lieu of ttstart and must do what it would.
+ */
+ if (tp->t_oproc != NULL)
+ (*tp->t_oproc)(tp);
+
+ /*
+ * If the transmit queue has drained and the tty has not hung up
+ * or been disconnected from the ppp unit, then tell if_ppp.c that
+ * we need more output.
+ */
+ if (CCOUNT(&tp->t_outq) < PPP_LOWAT
+ && !((tp->t_state & TS_CARR_ON) == 0 && (tp->t_cflag & CLOCAL) == 0)
+ && sc != NULL && tp == (struct tty *) sc->sc_devp) {
+ ppp_restart(sc);
+ }
+