BSD 4_3_Net_2 release

[unix-history] / usr / src / sys / kern / tty_pty.c

diff --git a/usr/src/sys/kern/tty_pty.c b/usr/src/sys/kern/tty_pty.c
index a7b5af9..eb9bf5f 100644 (file)
--- a/usr/src/sys/kern/tty_pty.c
+++ b/usr/src/sys/kern/tty_pty.c
@@ -1,227 +1,680 @@
-#
+/*
+ * Copyright (c) 1982, 1986, 1989 The Regents of the University of California.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *     This product includes software developed by the University of
+ *     California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ *     @(#)tty_pty.c   7.21 (Berkeley) 5/30/91
+ */
+

 /*
  * Pseudo-teletype Driver
  * (Actually two drivers, requiring two entries in 'cdevsw')
 /*
  * Pseudo-teletype Driver
  * (Actually two drivers, requiring two entries in 'cdevsw')

- *
- * Overhauled, and ported to VAX/VMUNIX (V7) Bruce Borden, July 80

  */
  */

-#include "../h/param.h"
-#include "../h/systm.h"
-#include "../h/tty.h"
-#include "../h/dir.h"
-#include "../h/user.h"
-#include "../h/conf.h"
-#include "../h/buf.h"
-
-#define NPTY 16                 /* Number of pseudo-teletypes */
-#define BUFSIZ 100              /* Chunk size iomoved from user */
-#define ALLDELAYS (NLDELAY|TBDELAY|XTABS|CRDELAY|VTDELAY)
+#include "pty.h"
+
+#if NPTY > 0
+#include "param.h"
+#include "systm.h"
+#include "ioctl.h"
+#include "tty.h"
+#include "conf.h"
+#include "file.h"
+#include "proc.h"
+#include "uio.h"
+#include "kernel.h"
+#include "vnode.h"
+
+#if NPTY == 1
+#undef NPTY
+#define        NPTY    32              /* crude XXX */
+#endif
+
+#define BUFSIZ 100             /* Chunk size iomoved to/from user */
+

 /*
 /*

- * A pseudo-teletype is a special device which is not unlike a pipe.
- * It is used to communicate between two processes.  However, it allows
- * one to simulate a teletype, including mode setting, interrupt, and
- * multiple end of files (all not possible on a pipe).  There are
- * really two drivers here.  One is the device which looks like a TTY
- * and can be thought of as the slave device, and hence its routines
- * are prefixed with 'pts' (PTY Slave).  The other driver can be
- * thought of as the controlling device, and its routines are prefixed
- * by 'ptc' (PTY Controller).  To type on the simulated keyboard of the
- * PTY, one does a 'write' to the controlling device.  To get the
- * simulated printout from the PTY, one does a 'read' on the controlling
- * device.  Normally, the controlling device is called 'ptyx' and the
- * slave device is called 'ttyx' (to make programs like 'who' happy).
+ * pts == /dev/tty[pqrs]?
+ * ptc == /dev/pty[pqrs]?

  */
  */

+struct tty pt_tty[NPTY];
+struct pt_ioctl {
+       int     pt_flags;
+       struct  proc *pt_selr, *pt_selw;
+       u_char  pt_send;
+       u_char  pt_ucntl;
+} pt_ioctl[NPTY];
+int    npty = NPTY;            /* for pstat -t */

 
 

-struct tty pt_tty[NPTY];                /* TTY headers for PTYs */
+#define        PF_RCOLL        0x01
+#define        PF_WCOLL        0x02
+#define        PF_PKT          0x08            /* packet mode */
+#define        PF_STOPPED      0x10            /* user told stopped */
+#define        PF_REMOTE       0x20            /* remote and flow controlled input */
+#define        PF_NOSTOP       0x40
+#define PF_UCNTL       0x80            /* user control mode */

 
 /*ARGSUSED*/
 
 /*ARGSUSED*/

-ptsopen(dev, flag)
-dev_t dev;
-{                                       /* Open for PTY Slave */
+ptsopen(dev, flag, devtype, p)
+       dev_t dev;
+       struct proc *p;
+{

        register struct tty *tp;
        register struct tty *tp;

+       int error;

 
 

-       if(minor(dev) >= NPTY) {
-               u.u_error = ENXIO;
-               return;
-       }
+#ifdef lint
+       npty = npty;
+#endif
+       if (minor(dev) >= NPTY)
+               return (ENXIO);

        tp = &pt_tty[minor(dev)];
        tp = &pt_tty[minor(dev)];

-       if((tp->t_state & ISOPEN) == 0) {
-               ttychars(tp);           /* Set up default chars */
-               tp->t_flags = 0;        /* No features (nor raw mode) */
-       } else if(tp->t_state&XCLUDE && u.u_uid != 0) {
-               u.u_error = EBUSY;
-               return;
-       }
-       if(tp->t_oproc)                 /* Ctrlr still around. */
-               tp->t_state |= CARR_ON;
-       while((tp->t_state & CARR_ON) == 0) {
-               tp->t_state |= WOPEN;
-               sleep((caddr_t)&tp->t_rawq, TTIPRI);
+       if ((tp->t_state & TS_ISOPEN) == 0) {
+               tp->t_state |= TS_WOPEN;
+               ttychars(tp);           /* Set up default chars */
+               tp->t_iflag = TTYDEF_IFLAG;
+               tp->t_oflag = TTYDEF_OFLAG;
+               tp->t_lflag = TTYDEF_LFLAG;
+               tp->t_cflag = TTYDEF_CFLAG;
+               tp->t_ispeed = tp->t_ospeed = TTYDEF_SPEED;
+               ttsetwater(tp);         /* would be done in xxparam() */
+       } else if (tp->t_state&TS_XCLUDE && p->p_ucred->cr_uid != 0)
+               return (EBUSY);
+       if (tp->t_oproc)                        /* Ctrlr still around. */
+               tp->t_state |= TS_CARR_ON;
+       while ((tp->t_state & TS_CARR_ON) == 0) {
+               tp->t_state |= TS_WOPEN;
+               if (flag&FNONBLOCK)
+                       break;
+               if (error = ttysleep(tp, (caddr_t)&tp->t_rawq, TTIPRI | PCATCH,
+                   ttopen, 0))
+                       return (error);

        }
        }

-       (*linesw[tp->t_line].l_open)(dev, tp);
+       error = (*linesw[tp->t_line].l_open)(dev, tp, flag);
+       ptcwakeup(tp, FREAD|FWRITE);
+       return (error);

 }
 
 }
 

-ptsclose(dev)
-dev_t dev;
-{                                       /* Close slave part of PTY */
+ptsclose(dev, flag, mode, p)
+       dev_t dev;
+       int flag, mode;
+       struct proc *p;
+{

        register struct tty *tp;
 
        tp = &pt_tty[minor(dev)];
        register struct tty *tp;
 
        tp = &pt_tty[minor(dev)];

-       (*linesw[tp->t_line].l_close)(tp);
+       (*linesw[tp->t_line].l_close)(tp, flag);
+       ttyclose(tp);
+       ptcwakeup(tp, FREAD|FWRITE);

 }
 
 }
 

-ptsread(dev)
-dev_t dev;
-{       /* Read from PTY, i.e. from data written by controlling device */
-       register struct tty    *tp;
+ptsread(dev, uio, flag)
+       dev_t dev;
+       struct uio *uio;
+{
+       struct proc *p = curproc;
+       register struct tty *tp = &pt_tty[minor(dev)];
+       register struct pt_ioctl *pti = &pt_ioctl[minor(dev)];
+       int error = 0;

 
 

-       tp = &pt_tty[minor(dev)];
-       if(tp->t_oproc) {
-               (*linesw[tp->t_line].l_read)(tp);
-                               /* Wakeup other half if sleeping */
-               wakeup((caddr_t)&tp->t_rawq.c_cf);
-       }
+again:
+       if (pti->pt_flags & PF_REMOTE) {
+               while (isbackground(p, tp)) {
+                       if ((p->p_sigignore & sigmask(SIGTTIN)) ||
+                           (p->p_sigmask & sigmask(SIGTTIN)) ||
+                           p->p_pgrp->pg_jobc == 0 ||
+                           p->p_flag&SPPWAIT)
+                               return (EIO);
+                       pgsignal(p->p_pgrp, SIGTTIN, 1);
+                       if (error = ttysleep(tp, (caddr_t)&lbolt, 
+                           TTIPRI | PCATCH, ttybg, 0))
+                               return (error);
+               }
+               if (tp->t_canq.c_cc == 0) {
+                       if (flag & IO_NDELAY)
+                               return (EWOULDBLOCK);
+                       if (error = ttysleep(tp, (caddr_t)&tp->t_canq,
+                           TTIPRI | PCATCH, ttyin, 0))
+                               return (error);
+                       goto again;
+               }
+               while (tp->t_canq.c_cc > 1 && uio->uio_resid > 0)
+                       if (ureadc(getc(&tp->t_canq), uio) < 0) {
+                               error = EFAULT;
+                               break;
+                       }
+               if (tp->t_canq.c_cc == 1)
+                       (void) getc(&tp->t_canq);
+               if (tp->t_canq.c_cc)
+                       return (error);
+       } else
+               if (tp->t_oproc)
+                       error = (*linesw[tp->t_line].l_read)(tp, uio, flag);
+       ptcwakeup(tp, FWRITE);
+       return (error);

 }
 
 }
 

-ptswrite(dev)
-dev_t dev;
-{                       /* Write on PTY, i.e. to be read from
-                          controlling device */
+/*
+ * Write to pseudo-tty.
+ * Wakeups of controlling tty will happen
+ * indirectly, when tty driver calls ptsstart.
+ */
+ptswrite(dev, uio, flag)
+       dev_t dev;
+       struct uio *uio;
+{

        register struct tty *tp;
 
        tp = &pt_tty[minor(dev)];
        register struct tty *tp;
 
        tp = &pt_tty[minor(dev)];

-                       /* Wait for controlling device to be opened */
-       if(tp->t_oproc)
-               (*linesw[tp->t_line].l_write)(tp);
+       if (tp->t_oproc == 0)
+               return (EIO);
+       return ((*linesw[tp->t_line].l_write)(tp, uio, flag));

 }
 
 }
 

+/*
+ * Start output on pseudo-tty.
+ * Wake up process selecting or sleeping for input from controlling tty.
+ */

 ptsstart(tp)
 ptsstart(tp)

-struct tty *tp;
-{                       /* Called by 'ttstart' to output a character.
-                          Merely wakes up controlling half, which
-                          does actual work */
-       if(tp->t_state & TTSTOP)
+       struct tty *tp;
+{
+       register struct pt_ioctl *pti = &pt_ioctl[minor(tp->t_dev)];
+
+       if (tp->t_state & TS_TTSTOP)

                return;
                return;

-       wakeup((caddr_t)&tp->t_outq.c_cf);
+       if (pti->pt_flags & PF_STOPPED) {
+               pti->pt_flags &= ~PF_STOPPED;
+               pti->pt_send = TIOCPKT_START;
+       }
+       ptcwakeup(tp, FREAD);

 }
 
 }
 

-/*ARGSUSED*/
-ptcopen(dev, flag)
-dev_t dev;
-{                               /* Open for PTY Controller */
-       register struct tty *tp;
+ptcwakeup(tp, flag)
+       struct tty *tp;
+{
+       struct pt_ioctl *pti = &pt_ioctl[minor(tp->t_dev)];

 
 

-       if(minor(dev) >= NPTY) {
-               u.u_error = ENXIO;
-               return;
+       if (flag & FREAD) {
+               if (pti->pt_selr) {
+                       selwakeup(pti->pt_selr, pti->pt_flags & PF_RCOLL);
+                       pti->pt_selr = 0;
+                       pti->pt_flags &= ~PF_RCOLL;
+               }
+               wakeup((caddr_t)&tp->t_outq.c_cf);

        }
        }

-       tp = &pt_tty[minor(dev)];
-       if(tp->t_oproc) {
-               u.u_error = EIO;
-               return;
+       if (flag & FWRITE) {
+               if (pti->pt_selw) {
+                       selwakeup(pti->pt_selw, pti->pt_flags & PF_WCOLL);
+                       pti->pt_selw = 0;
+                       pti->pt_flags &= ~PF_WCOLL;
+               }
+               wakeup((caddr_t)&tp->t_rawq.c_cf);

        }
        }

-       tp->t_oproc = ptsstart;         /* Set address of start routine */
-       tp->t_iproc = 0;
-       if(tp->t_state & WOPEN)
-               wakeup((caddr_t)&tp->t_rawq);
-       tp->t_state |= CARR_ON;

 }
 
 }
 

-ptcclose(dev)
-dev_t dev;
-{                                       /* Close controlling part of PTY */
+/*ARGSUSED*/
+#ifdef __STDC__
+ptcopen(dev_t dev, int flag, int devtype, struct proc *p)
+#else
+ptcopen(dev, flag, devtype, p)
+       dev_t dev;
+       int flag, devtype;
+       struct proc *p;
+#endif
+{

        register struct tty *tp;
        register struct tty *tp;

+       struct pt_ioctl *pti;

 
 

+       if (minor(dev) >= NPTY)
+               return (ENXIO);

        tp = &pt_tty[minor(dev)];
        tp = &pt_tty[minor(dev)];

-       if(tp->t_state & ISOPEN)
-               gsignal(tp->t_pgrp, SIGHUP);
-       tp->t_state &= ~CARR_ON;        /* Virtual carrier is gone */
-       flushtty(tp);                   /* Clean things up */
-       tp->t_oproc = 0;                /* Mark as closed */
+       if (tp->t_oproc)
+               return (EIO);
+       tp->t_oproc = ptsstart;
+       (void)(*linesw[tp->t_line].l_modem)(tp, 1);
+       tp->t_lflag &= ~EXTPROC;
+       pti = &pt_ioctl[minor(dev)];
+       pti->pt_flags = 0;
+       pti->pt_send = 0;
+       pti->pt_ucntl = 0;
+       return (0);

 }
 
 }
 

-ptcread(dev)
-dev_t dev;
-{                                       /* Read from PTY's output buffer */
+ptcclose(dev)
+       dev_t dev;
+{

        register struct tty *tp;
 
        tp = &pt_tty[minor(dev)];
        register struct tty *tp;
 
        tp = &pt_tty[minor(dev)];

-       if((tp->t_state&(CARR_ON|ISOPEN)) == 0)
-               return;
-       while(tp->t_outq.c_cc == 0 ||   /* Wait for something to arrive */
-             (tp->t_state&TTSTOP))     /* (Woken by ptsstart) */
-               sleep((caddr_t)&tp->t_outq.c_cf, TTIPRI);
-       while(tp->t_outq.c_cc && passc(getc(&tp->t_outq)) >= 0);
-       if(tp->t_outq.c_cc <= TTLOWAT(tp)  && (tp->t_state&ASLEEP)) {
-               tp->t_state &= ~ASLEEP;
-               if(tp->t_chan)
-                       mcstart(tp->t_chan, (caddr_t)&tp->t_outq);
-               else
+       (void)(*linesw[tp->t_line].l_modem)(tp, 0);
+       tp->t_state &= ~TS_CARR_ON;
+       tp->t_oproc = 0;                /* mark closed */
+       tp->t_session = 0;
+}
+
+ptcread(dev, uio, flag)
+       dev_t dev;
+       struct uio *uio;
+{
+       register struct tty *tp = &pt_tty[minor(dev)];
+       struct pt_ioctl *pti = &pt_ioctl[minor(dev)];
+       char buf[BUFSIZ];
+       int error = 0, cc;
+
+       /*
+        * We want to block until the slave
+        * is open, and there's something to read;
+        * but if we lost the slave or we're NBIO,
+        * then return the appropriate error instead.
+        */
+       for (;;) {
+               if (tp->t_state&TS_ISOPEN) {
+                       if (pti->pt_flags&PF_PKT && pti->pt_send) {
+                               error = ureadc((int)pti->pt_send, uio);
+                               if (error)
+                                       return (error);
+                               if (pti->pt_send & TIOCPKT_IOCTL) {
+                                       cc = MIN(uio->uio_resid,
+                                               sizeof(tp->t_termios));
+                                       uiomove(&tp->t_termios, cc, uio);
+                               }
+                               pti->pt_send = 0;
+                               return (0);
+                       }
+                       if (pti->pt_flags&PF_UCNTL && pti->pt_ucntl) {
+                               error = ureadc((int)pti->pt_ucntl, uio);
+                               if (error)
+                                       return (error);
+                               pti->pt_ucntl = 0;
+                               return (0);
+                       }
+                       if (tp->t_outq.c_cc && (tp->t_state&TS_TTSTOP) == 0)
+                               break;
+               }
+               if ((tp->t_state&TS_CARR_ON) == 0)
+                       return (0);     /* EOF */
+               if (flag & IO_NDELAY)
+                       return (EWOULDBLOCK);
+               if (error = tsleep((caddr_t)&tp->t_outq.c_cf, TTIPRI | PCATCH,
+                   ttyin, 0))
+                       return (error);
+       }
+       if (pti->pt_flags & (PF_PKT|PF_UCNTL))
+               error = ureadc(0, uio);
+       while (uio->uio_resid > 0 && error == 0) {
+               cc = q_to_b(&tp->t_outq, buf, MIN(uio->uio_resid, BUFSIZ));
+               if (cc <= 0)
+                       break;
+               error = uiomove(buf, cc, uio);
+       }
+       if (tp->t_outq.c_cc <= tp->t_lowat) {
+               if (tp->t_state&TS_ASLEEP) {
+                       tp->t_state &= ~TS_ASLEEP;

                        wakeup((caddr_t)&tp->t_outq);
                        wakeup((caddr_t)&tp->t_outq);

+               }
+               if (tp->t_wsel) {
+                       selwakeup(tp->t_wsel, tp->t_state & TS_WCOLL);
+                       tp->t_wsel = 0;
+                       tp->t_state &= ~TS_WCOLL;
+               }

        }
        }

+       return (error);

 }
 
 }
 

-ptcwrite(dev)
-dev_t dev;
-{                       /* Stuff characters into PTY's input buffer */
+ptsstop(tp, flush)

        register struct tty *tp;
        register struct tty *tp;

-       register char *cp, *ce;
-       register int cc;
-       char locbuf[BUFSIZ];
+       int flush;
+{
+       struct pt_ioctl *pti = &pt_ioctl[minor(tp->t_dev)];
+       int flag;

 
 

-       tp = &pt_tty[minor(dev)];
-       if((tp->t_state&(CARR_ON|ISOPEN)) == 0)
-               return;
-       while(u.u_count) {
-               cc = MIN(u.u_count, BUFSIZ);
-               cp = locbuf;
-               iomove(cp, (unsigned)cc, B_WRITE);
-               if(u.u_error)
-                       break;
-               ce = cp + cc;
-               while(cp < ce) {
-                       while(tp->t_delct && tp->t_rawq.c_cc >= TTYHOG - 2) {
+       /* note: FLUSHREAD and FLUSHWRITE already ok */
+       if (flush == 0) {
+               flush = TIOCPKT_STOP;
+               pti->pt_flags |= PF_STOPPED;
+       } else
+               pti->pt_flags &= ~PF_STOPPED;
+       pti->pt_send |= flush;
+       /* change of perspective */
+       flag = 0;
+       if (flush & FREAD)
+               flag |= FWRITE;
+       if (flush & FWRITE)
+               flag |= FREAD;
+       ptcwakeup(tp, flag);
+}
+
+ptcselect(dev, rw, p)
+       dev_t dev;
+       int rw;
+       struct proc *p;
+{
+       register struct tty *tp = &pt_tty[minor(dev)];
+       struct pt_ioctl *pti = &pt_ioctl[minor(dev)];
+       struct proc *prev;
+       int s;
+
+       if ((tp->t_state&TS_CARR_ON) == 0)
+               return (1);
+       switch (rw) {
+
+       case FREAD:
+               /*
+                * Need to block timeouts (ttrstart).
+                */
+               s = spltty();
+               if ((tp->t_state&TS_ISOPEN) &&
+                    tp->t_outq.c_cc && (tp->t_state&TS_TTSTOP) == 0) {
+                       splx(s);
+                       return (1);
+               }
+               splx(s);
+               /* FALLTHROUGH */
+
+       case 0:                                 /* exceptional */
+               if ((tp->t_state&TS_ISOPEN) &&
+                   (pti->pt_flags&PF_PKT && pti->pt_send ||
+                    pti->pt_flags&PF_UCNTL && pti->pt_ucntl))
+                       return (1);
+               if ((prev = pti->pt_selr) && prev->p_wchan == (caddr_t)&selwait)
+                       pti->pt_flags |= PF_RCOLL;
+               else
+                       pti->pt_selr = p;
+               break;
+
+
+       case FWRITE:
+               if (tp->t_state&TS_ISOPEN) {
+                       if (pti->pt_flags & PF_REMOTE) {
+                           if (tp->t_canq.c_cc == 0)
+                               return (1);
+                       } else {
+                           if (tp->t_rawq.c_cc + tp->t_canq.c_cc < TTYHOG-2)
+                                   return (1);
+                           if (tp->t_canq.c_cc == 0 && (tp->t_iflag&ICANON))
+                                   return (1);
+                       }
+               }
+               if ((prev = pti->pt_selw) && prev->p_wchan == (caddr_t)&selwait)
+                       pti->pt_flags |= PF_WCOLL;
+               else
+                       pti->pt_selw = p;
+               break;
+
+       }
+       return (0);
+}
+
+ptcwrite(dev, uio, flag)
+       dev_t dev;
+       register struct uio *uio;
+{
+       register struct tty *tp = &pt_tty[minor(dev)];
+       register u_char *cp;
+       register int cc = 0;
+       u_char locbuf[BUFSIZ];
+       int cnt = 0;
+       struct pt_ioctl *pti = &pt_ioctl[minor(dev)];
+       int error = 0;
+
+again:
+       if ((tp->t_state&TS_ISOPEN) == 0)
+               goto block;
+       if (pti->pt_flags & PF_REMOTE) {
+               if (tp->t_canq.c_cc)
+                       goto block;
+               while (uio->uio_resid > 0 && tp->t_canq.c_cc < TTYHOG - 1) {
+                       if (cc == 0) {
+                               cc = min(uio->uio_resid, BUFSIZ);
+                               cc = min(cc, TTYHOG - 1 - tp->t_canq.c_cc);
+                               cp = locbuf;
+                               error = uiomove((caddr_t)cp, cc, uio);
+                               if (error)
+                                       return (error);
+                               /* check again for safety */
+                               if ((tp->t_state&TS_ISOPEN) == 0)
+                                       return (EIO);
+                       }
+                       if (cc)
+                               (void) b_to_q((char *)cp, cc, &tp->t_canq);
+                       cc = 0;
+               }
+               (void) putc(0, &tp->t_canq);
+               ttwakeup(tp);
+               wakeup((caddr_t)&tp->t_canq);
+               return (0);
+       }
+       while (uio->uio_resid > 0) {
+               if (cc == 0) {
+                       cc = min(uio->uio_resid, BUFSIZ);
+                       cp = locbuf;
+                       error = uiomove((caddr_t)cp, cc, uio);
+                       if (error)
+                               return (error);
+                       /* check again for safety */
+                       if ((tp->t_state&TS_ISOPEN) == 0)
+                               return (EIO);
+               }
+               while (cc > 0) {
+                       if ((tp->t_rawq.c_cc + tp->t_canq.c_cc) >= TTYHOG - 2 &&
+                          (tp->t_canq.c_cc > 0 || !(tp->t_iflag&ICANON))) {

                                wakeup((caddr_t)&tp->t_rawq);
                                wakeup((caddr_t)&tp->t_rawq);

-                               /* Better than just flushing it! */
-                               /* Wait for something to be read */
-                               sleep((caddr_t)&tp->t_rawq.c_cf, TTOPRI);
+                               goto block;

                        }
                        }

-                       ttyinput(*cp++, tp);
+                       (*linesw[tp->t_line].l_rint)(*cp++, tp);
+                       cnt++;
+                       cc--;

                }
                }

+               cc = 0;
+       }
+       return (0);
+block:
+       /*
+        * Come here to wait for slave to open, for space
+        * in outq, or space in rawq.
+        */
+       if ((tp->t_state&TS_CARR_ON) == 0)
+               return (EIO);
+       if (flag & IO_NDELAY) {
+               /* adjust for data copied in but not written */
+               uio->uio_resid += cc;
+               if (cnt == 0)
+                       return (EWOULDBLOCK);
+               return (0);
+       }
+       if (error = tsleep((caddr_t)&tp->t_rawq.c_cf, TTOPRI | PCATCH,
+           ttyout, 0)) {
+               /* adjust for data copied in but not written */
+               uio->uio_resid += cc;
+               return (error);

        }
        }

+       goto again;

 }
 
 }
 

-/* Note: Both slave and controlling device have the same routine for */
-/* 'ioctl' (but note check for controller - 4/12/78:mob)*/

 /*ARGSUSED*/
 /*ARGSUSED*/

-ptyioctl(dev, cmd, addr, flag)
-caddr_t addr;
-dev_t dev;
-{                                      /* Read and write status bits */
-       register struct tty *tp;
-       register int tbd;
-#ifdef BLAND
-       register int nld;
-#endif
+ptyioctl(dev, cmd, data, flag)
+       caddr_t data;
+       dev_t dev;
+{
+       register struct tty *tp = &pt_tty[minor(dev)];
+       register struct pt_ioctl *pti = &pt_ioctl[minor(dev)];
+       register u_char *cc = tp->t_cc;
+       int stop, error;
+       extern ttyinput();

 
 

-       tp = &pt_tty[minor(dev)];
-               /* if controller stty then must flush to prevent a hang */
-       if(cdevsw[major(dev)].d_open == ptcopen && cmd == TIOCSETP)
-               while(getc(&tp->t_outq) >= 0);
-       if(ttioctl(tp, cmd, addr, dev)) {
-               if(cmd == TIOCSETP || cmd == TIOCSETN) {
-#ifdef BLAND
-                       nld = tp->t_flags & NLDELAY;
-#endif
-                       tbd = tp->t_flags & TBDELAY;
-                       tp->t_flags &= ~ALLDELAYS;
-                       if(tbd == TBDELAY)      /* Wants tab expansion */
-                               tp->t_flags |= tbd;
-#ifdef BLAND
-                       if(nld == NLDELAY)      /* Allow ANN ARBOR mode. */
-                               tp->t_flags |= nld;
-#endif
+       /*
+        * IF CONTROLLER STTY THEN MUST FLUSH TO PREVENT A HANG.
+        * ttywflush(tp) will hang if there are characters in the outq.
+        */
+       if (cmd == TIOCEXT) {
+               /*
+                * When the EXTPROC bit is being toggled, we need
+                * to send an TIOCPKT_IOCTL if the packet driver
+                * is turned on.
+                */
+               if (*(int *)data) {
+                       if (pti->pt_flags & PF_PKT) {
+                               pti->pt_send |= TIOCPKT_IOCTL;
+                               ptcwakeup(tp);
+                       }
+                       tp->t_lflag |= EXTPROC;
+               } else {
+                       if ((tp->t_state & EXTPROC) &&
+                           (pti->pt_flags & PF_PKT)) {
+                               pti->pt_send |= TIOCPKT_IOCTL;
+                               ptcwakeup(tp);
+                       }
+                       tp->t_lflag &= ~EXTPROC;

                }
                }

+               return(0);

        } else
        } else

-               u.u_error = ENOTTY;
+       if (cdevsw[major(dev)].d_open == ptcopen)
+               switch (cmd) {
+
+               case TIOCGPGRP:
+                       /*
+                        * We aviod calling ttioctl on the controller since,
+                        * in that case, tp must be the controlling terminal.
+                        */
+                       *(int *)data = tp->t_pgrp ? tp->t_pgrp->pg_id : 0;
+                       return (0);
+
+               case TIOCPKT:
+                       if (*(int *)data) {
+                               if (pti->pt_flags & PF_UCNTL)
+                                       return (EINVAL);
+                               pti->pt_flags |= PF_PKT;
+                       } else
+                               pti->pt_flags &= ~PF_PKT;
+                       return (0);
+
+               case TIOCUCNTL:
+                       if (*(int *)data) {
+                               if (pti->pt_flags & PF_PKT)
+                                       return (EINVAL);
+                               pti->pt_flags |= PF_UCNTL;
+                       } else
+                               pti->pt_flags &= ~PF_UCNTL;
+                       return (0);
+
+               case TIOCREMOTE:
+                       if (*(int *)data)
+                               pti->pt_flags |= PF_REMOTE;
+                       else
+                               pti->pt_flags &= ~PF_REMOTE;
+                       ttyflush(tp, FREAD|FWRITE);
+                       return (0);
+
+               case TIOCSETP:          
+               case TIOCSETN:
+               case TIOCSETD:
+               case TIOCSETA:
+               case TIOCSETAW:
+               case TIOCSETAF:
+                       while (getc(&tp->t_outq) >= 0)
+                               ;
+                       break;
+
+               case TIOCSIG:
+                       if (*(unsigned int *)data >= NSIG)
+                               return(EINVAL);
+                       if ((tp->t_lflag&NOFLSH) == 0)
+                               ttyflush(tp, FREAD|FWRITE);
+                       pgsignal(tp->t_pgrp, *(unsigned int *)data, 1);
+                       if ((*(unsigned int *)data == SIGINFO) &&
+                           ((tp->t_lflag&NOKERNINFO) == 0))
+                               ttyinfo(tp);
+                       return(0);
+               }
+       error = (*linesw[tp->t_line].l_ioctl)(tp, cmd, data, flag);
+       if (error < 0)
+                error = ttioctl(tp, cmd, data, flag);
+       /*
+        * Since we use the tty queues internally,
+        * pty's can't be switched to disciplines which overwrite
+        * the queues.  We can't tell anything about the discipline
+        * from here...
+        */
+       if (linesw[tp->t_line].l_rint != ttyinput) {
+               (*linesw[tp->t_line].l_close)(tp, flag);
+               tp->t_line = TTYDISC;
+               (void)(*linesw[tp->t_line].l_open)(dev, tp, flag);
+               error = ENOTTY;
+       }
+       if (error < 0) {
+               if (pti->pt_flags & PF_UCNTL &&
+                   (cmd & ~0xff) == UIOCCMD(0)) {
+                       if (cmd & 0xff) {
+                               pti->pt_ucntl = (u_char)cmd;
+                               ptcwakeup(tp, FREAD);
+                       }
+                       return (0);
+               }
+               error = ENOTTY;
+       }
+       /*
+        * If external processing and packet mode send ioctl packet.
+        */
+       if ((tp->t_lflag&EXTPROC) && (pti->pt_flags & PF_PKT)) {
+               switch(cmd) {
+               case TIOCSETA:
+               case TIOCSETAW:
+               case TIOCSETAF:
+               case TIOCSETP:
+               case TIOCSETN:
+#ifdef COMPAT_43
+               case TIOCSETC:
+               case TIOCSLTC:
+               case TIOCLBIS:
+               case TIOCLBIC:
+               case TIOCLSET:
+#endif
+                       pti->pt_send |= TIOCPKT_IOCTL;
+               default:
+                       break;
+               }
+       }
+       stop = (tp->t_iflag & IXON) && CCEQ(cc[VSTOP], CTRL('s')) 
+               && CCEQ(cc[VSTART], CTRL('q'));
+       if (pti->pt_flags & PF_NOSTOP) {
+               if (stop) {
+                       pti->pt_send &= ~TIOCPKT_NOSTOP;
+                       pti->pt_send |= TIOCPKT_DOSTOP;
+                       pti->pt_flags &= ~PF_NOSTOP;
+                       ptcwakeup(tp, FREAD);
+               }
+       } else {
+               if (!stop) {
+                       pti->pt_send &= ~TIOCPKT_DOSTOP;
+                       pti->pt_send |= TIOCPKT_NOSTOP;
+                       pti->pt_flags |= PF_NOSTOP;
+                       ptcwakeup(tp, FREAD);
+               }
+       }
+       return (error);

 }
 }

+#endif