Fix compilation problems; fix spls; add software flow control

[ppp.git] / freebsd-2.0 / ppp_tty.c

diff --git a/freebsd-2.0/ppp_tty.c b/freebsd-2.0/ppp_tty.c
index 1f22821dc26f58b4b1398b3508fefd6b130748cc..81ffe925b97f4a1e7c3252bf7aaacb66e930507d 100644 (file)
--- a/freebsd-2.0/ppp_tty.c
+++ b/freebsd-2.0/ppp_tty.c
@@ -70,7 +70,7 @@
  * Paul Mackerras (paulus@cs.anu.edu.au).
  */
 
-/* $Id: ppp_tty.c,v 1.2 1995/05/02 01:00:44 paulus Exp $ */
+/* $Id: ppp_tty.c,v 1.4 1995/10/27 03:34:44 paulus Exp $ */
 /* from if_sl.c,v 1.11 84/10/04 12:54:47 rick Exp */
 
 #include "ppp.h"
@@ -111,7 +111,7 @@ int pppopen __P((dev_t dev, struct tty *tp));
 int    pppclose __P((struct tty *tp, int flag));
 int    pppread __P((struct tty *tp, struct uio *uio, int flag));
 int    pppwrite __P((struct tty *tp, struct uio *uio, int flag));
-int    ppptioctl __P((struct tty *tp, int cmd, caddr_t data, int flag,
+int    ppptioctl __P((struct tty *tp, u_long cmd, caddr_t data, int flag,
                       struct proc *));
 int    pppinput __P((int c, struct tty *tp));
 int    pppstart __P((struct tty *tp));
@@ -157,7 +157,7 @@ static void ppplogchar __P((struct ppp_softc *, int));
 
 static struct linesw pppdisc = {
        pppopen, pppclose, pppread, pppwrite, ppptioctl,
-       pppinput, pppstart, nullmodem
+       pppinput, pppstart, ttymodem
 };
 
 void
@@ -171,6 +171,7 @@ TEXT_SET(pseudo_set, pppasyncattach);
 /*
  * Line specific open routine for async tty devices.
  * Attach the given tty to the first available ppp unit.
+ * Called from device open routine or ttioctl.
  */
 /* ARGSUSED */
 int
@@ -185,19 +186,24 @@ pppopen(dev, tp)
     if (error = suser(p->p_ucred, &p->p_acflag))
        return (error);
 
+    s = spltty();
+
     if (tp->t_line == PPPDISC) {
        sc = (struct ppp_softc *) tp->t_sc;
-       if (sc != NULL && sc->sc_devp == (void *) tp)
+       if (sc != NULL && sc->sc_devp == (void *) tp) {
+           splx(s);
            return (0);
+       }
     }
 
-    if ((sc = pppalloc(p->p_pid)) == NULL)
+    if ((sc = pppalloc(p->p_pid)) == NULL) {
+       splx(s);
        return ENXIO;
+    }
 
     if (sc->sc_relinq)
        (*sc->sc_relinq)(sc);   /* get previous owner to relinquish the unit */
 
-    s = splimp();
     sc->sc_ilen = 0;
     sc->sc_m = NULL;
     bzero(sc->sc_asyncmap, sizeof(sc->sc_asyncmap));
@@ -214,13 +220,14 @@ pppopen(dev, tp)
 
     tp->t_sc = (caddr_t) sc;
     ttyflush(tp, FREAD | FWRITE);
-    splx(s);
 
+    splx(s);
     return (0);
 }
 
 /*
- * Line specific close routine.
+ * Line specific close routine, called from device close routine
+ * and from ttioctl.
  * Detach the tty from the ppp unit.
  * Mimics part of ttyclose().
  */
@@ -233,8 +240,8 @@ pppclose(tp, flag)
     struct mbuf *m;
     int s;
 
-    ttywflush(tp);
-    s = splimp();              /* paranoid; splnet probably ok */
+    s = spltty();
+    ttyflush(tp, FREAD|FWRITE);
     tp->t_line = 0;
     sc = (struct ppp_softc *) tp->t_sc;
     if (sc != NULL) {
@@ -257,7 +264,7 @@ pppasyncrelinq(sc)
 {
     int s;
 
-    s = splimp();
+    s = spltty();
     if (sc->sc_outm) {
        m_freem(sc->sc_outm);
        sc->sc_outm = NULL;
@@ -293,7 +300,7 @@ pppread(tp, uio, flag)
      * Loop waiting for input, checking that nothing disasterous
      * happens in the meantime.
      */
-    s = splimp();
+    s = spltty();
     for (;;) {
        if (tp != (struct tty *) sc->sc_devp || tp->t_line != PPPDISC) {
            splx(s);
@@ -310,7 +317,7 @@ pppread(tp, uio, flag)
            splx(s);
            return (EWOULDBLOCK);
        }
-       error = ttysleep(tp, (caddr_t)&tp->t_rawq, TTIPRI|PCATCH, ttyin, 0);
+       error = ttysleep(tp, (caddr_t)&tp->t_rawq, TTIPRI | PCATCH, "ttyin", 0);
        if (error) {
            splx(s);
            return error;
@@ -388,8 +395,9 @@ pppwrite(tp, uio, flag)
 int
 ppptioctl(tp, cmd, data, flag, p)
     struct tty *tp;
+    u_long cmd;
     caddr_t data;
-    int cmd, flag;
+    int flag;
     struct proc *p;
 {
     struct ppp_softc *sc = (struct ppp_softc *) tp->t_sc;
@@ -498,7 +506,7 @@ pppfcs(fcs, cp, len)
 
 /*
  * This gets called from pppoutput when a new packet is
- * put on a queue.
+ * put on a queue, at splnet.
  */
 static void
 pppasyncstart(sc)
@@ -507,30 +515,34 @@ pppasyncstart(sc)
     register struct tty *tp = (struct tty *) sc->sc_devp;
     int s;
 
-    s = splimp();
+    s = spltty();
     pppstart(tp);
     splx(s);
 }
 
 /*
  * This gets called when a received packet is placed on
- * the inq.
+ * the inq, at splnet.
  */
 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.  Get another datagram
  * to send from the interface queue and start sending it.
+ * Called at spltty or higher.
  */
 int
 pppstart(tp)
@@ -695,7 +707,7 @@ pppstart(tp)
     }
 
     /*
-     * If there is stuff in the output queue, send it now.
+     * Send anything that may be in the output queue.
      * We are being called in lieu of ttstart and must do what it would.
      */
     if (tp->t_oproc != NULL)
@@ -725,7 +737,7 @@ ppp_timeout(x)
     struct tty *tp = (struct tty *) sc->sc_devp;
     int s;
 
-    s = splimp();
+    s = spltty();
     sc->sc_flags &= ~SC_TIMEOUT;
     pppstart(tp);
     splx(s);
@@ -742,7 +754,7 @@ pppgetm(sc)
     int len;
     int s;
 
-    s = splimp();
+    s = spltty();
     mp = &sc->sc_m;
     for (len = sc->sc_mru + PPP_HDRLEN + PPP_FCSLEN; len > 0; ){
        if ((m = *mp) == NULL) {
@@ -779,7 +791,7 @@ pppinput(c, tp)
     if (sc == NULL || tp != (struct tty *) sc->sc_devp)
        return 0;
 
-    s = spltty();
+    s = spltty();              /* should be unnecessary */
     ++tk_nin;
     ++sc->sc_bytesrcvd;
 
@@ -792,6 +804,22 @@ pppinput(c, tp)
 
     c &= 0xff;
 
+    if (sc->sc_flags & SC_XONXOFF) {
+       if (c == XOFF) {
+           if ((tp->t_state & TS_TTSTOP) == 0) {
+               tp->t_state |= TS_TTSTOP;
+               (*cdevsw[major(tp->t_dev)].d_stop)(tp, 0);
+           }
+           return 0;
+       }
+       if (c == XON) {
+           tp->t_state &= ~TS_TTSTOP;
+           if (tp->t_oproc != NULL)
+               (*tp->t_oproc)(tp);
+           return 0;
+       }
+    }
+
     if (c & 0x80)
        sc->sc_flags |= SC_RCV_B7_1;
     else