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[unix-history] / usr / src / sys / kern / tty.c
diff --git a/usr/src/sys/kern/tty.c b/usr/src/sys/kern/tty.c
index 2b2318e..b0a5156 100644 (file)
--- a/usr/src/sys/kern/tty.c
+++ b/usr/src/sys/kern/tty.c
@@ -1,7 +1,7 @@
-/*     tty.c   3.9     %G%     */
+/*     tty.c   4.24    82/07/24        */
 
 /*
 
 /*
- * general TTY subroutines
+ * TTY subroutines common to more than one line discipline
  */
 #include "../h/param.h"
 #include "../h/systm.h"
  */
 #include "../h/param.h"
 #include "../h/systm.h"
@@ -9,7 +9,6 @@
 #include "../h/user.h"
 #include "../h/tty.h"
 #include "../h/proc.h"
 #include "../h/user.h"
 #include "../h/tty.h"
 #include "../h/proc.h"
-#include "../h/mx.h"
 #include "../h/inode.h"
 #include "../h/file.h"
 #include "../h/reg.h"
 #include "../h/inode.h"
 #include "../h/file.h"
 #include "../h/reg.h"
@@ -17,19 +16,55 @@
 #include "../h/buf.h"
 #include "../h/dk.h"
 
 #include "../h/buf.h"
 #include "../h/dk.h"
 
-char   partab[];
-
 /*
 /*
- * When running dz's using only SAE (silo alarm) on input
- * it is necessary to call dzrint() at clock interrupt time.
- * This is unsafe unless spl5()s in tty code are changed to
- * spl6()s to block clock interrupts.  Note that the dh driver
- * currently in use works the same way as the dz, even though
- * we could try to more intelligently manage its silo.
- * Thus don't take this out if you have no dz's unless you
- * change clock.c and dhtimer().
+ * Table giving parity for characters and indicating
+ * character classes to tty driver.  In particular,
+ * if the low 6 bits are 0, then the character needs
+ * no special processing on output.
  */
  */
-#define        spl5    spl6
+
+char partab[] = {
+       0001,0201,0201,0001,0201,0001,0001,0201,
+       0202,0004,0003,0201,0005,0206,0201,0001,
+       0201,0001,0001,0201,0001,0201,0201,0001,
+       0001,0201,0201,0001,0201,0001,0001,0201,
+       0200,0000,0000,0200,0000,0200,0200,0000,
+       0000,0200,0200,0000,0200,0000,0000,0200,
+       0000,0200,0200,0000,0200,0000,0000,0200,
+       0200,0000,0000,0200,0000,0200,0200,0000,
+       0200,0000,0000,0200,0000,0200,0200,0000,
+       0000,0200,0200,0000,0200,0000,0000,0200,
+       0000,0200,0200,0000,0200,0000,0000,0200,
+       0200,0000,0000,0200,0000,0200,0200,0000,
+       0000,0200,0200,0000,0200,0000,0000,0200,
+       0200,0000,0000,0200,0000,0200,0200,0000,
+       0200,0000,0000,0200,0000,0200,0200,0000,
+       0000,0200,0200,0000,0200,0000,0000,0201,
+
+       /*
+        * 7 bit ascii ends with the last character above,
+        * but we contine through all 256 codes for the sake
+        * of the tty output routines which use special vax
+        * instructions which need a 256 character trt table.
+        */
+
+       0007,0007,0007,0007,0007,0007,0007,0007,
+       0007,0007,0007,0007,0007,0007,0007,0007,
+       0007,0007,0007,0007,0007,0007,0007,0007,
+       0007,0007,0007,0007,0007,0007,0007,0007,
+       0007,0007,0007,0007,0007,0007,0007,0007,
+       0007,0007,0007,0007,0007,0007,0007,0007,
+       0007,0007,0007,0007,0007,0007,0007,0007,
+       0007,0007,0007,0007,0007,0007,0007,0007,
+       0007,0007,0007,0007,0007,0007,0007,0007,
+       0007,0007,0007,0007,0007,0007,0007,0007,
+       0007,0007,0007,0007,0007,0007,0007,0007,
+       0007,0007,0007,0007,0007,0007,0007,0007,
+       0007,0007,0007,0007,0007,0007,0007,0007,
+       0007,0007,0007,0007,0007,0007,0007,0007,
+       0007,0007,0007,0007,0007,0007,0007,0007,
+       0007,0007,0007,0007,0007,0007,0007,0007
+};
 
 /*
  * Input mapping table-- if an entry is non-zero, when the
 
 /*
  * Input mapping table-- if an entry is non-zero, when the
@@ -57,42 +92,13 @@ char        maptab[] ={
        'X','Y','Z',000,000,000,000,000,
 };
 
        'X','Y','Z',000,000,000,000,000,
 };
 
-
-/*
- * shorthand
- */
-#define        q1      tp->t_rawq
-#define        q2      tp->t_canq
-#define        q3      tp->t_outq
-#define        q4      tp->t_un.t_ctlq
+short  tthiwat[16] =
+   { 100,100,100,100,100,100,100,200,200,400,400,400,650,650,650,650 };
+short  ttlowat[16] =
+   {  30, 30, 30, 30, 30, 30, 30, 50, 50,120,120,120,125,125,125,125 };
 
 #define        OBUFSIZ 100
 
 
 #define        OBUFSIZ 100
 
-/*
- * routine called on first teletype open.
- * establishes a process group for distribution
- * of quits and interrupts from the tty.
- */
-ttyopen(dev, tp)
-dev_t dev;
-register struct tty *tp;
-{
-       register struct proc *pp;
-
-       pp = u.u_procp;
-       tp->t_dev = dev;
-       if(pp->p_pgrp == 0) {
-               u.u_ttyp = tp;
-               u.u_ttyd = dev;
-               if (tp->t_pgrp == 0)
-                       tp->t_pgrp = pp->p_pid;
-               pp->p_pgrp = tp->t_pgrp;
-       }
-       tp->t_state &= ~WOPEN;
-       tp->t_state |= ISOPEN;
-       tp->t_line = 0;         /* conservative */
-}
-
 /*
  * set default control characters.
  */
 /*
  * set default control characters.
  */
@@ -115,120 +121,191 @@ register struct tty *tp;
        tlun.t_flushc = CTRL(o);
        tlun.t_werasc = CTRL(w);
        tlun.t_lnextc = CTRL(v);
        tlun.t_flushc = CTRL(o);
        tlun.t_werasc = CTRL(w);
        tlun.t_lnextc = CTRL(v);
-       tlun.t_lintr = CTRL(c);
-       tlun.t_lerase = CTRL(h);
-       tlun.t_lkill = CTRL(u);
        tp->t_local = 0;
        tp->t_lstate = 0;
 /* end local */
 }
 
 /*
        tp->t_local = 0;
        tp->t_lstate = 0;
 /* end local */
 }
 
 /*
- * clean tp on last close
+ * Wait for output to drain, then flush input waiting.
  */
  */
-ttyclose(tp)
-register struct tty *tp;
+wflushtty(tp)
+       register struct tty *tp;
 {
 
 {
 
-       tp->t_pgrp = 0;
-       wflushtty(tp);
-       tp->t_state = 0;
-       tp->t_line = 0;
+       (void) spl5();
+       while (tp->t_outq.c_cc && tp->t_state&TS_CARR_ON
+           && tp->t_oproc) {           /* kludge for pty */
+               (*tp->t_oproc)(tp);
+               tp->t_state |= TS_ASLEEP;
+               sleep((caddr_t)&tp->t_outq, TTOPRI);
+       }
+       flushtty(tp, FREAD);
+       (void) spl0();
 }
 
 /*
 }
 
 /*
- * stty/gtty writearound
+ * flush all TTY queues
  */
  */
-stty()
+flushtty(tp, rw)
+register struct tty *tp;
 {
 {
-       u.u_arg[2] = u.u_arg[1];
-       u.u_arg[1] = TIOCSETP;
-       ioctl();
+       register s;
+
+       s = spl6();
+       if (rw & FREAD) {
+               while (getc(&tp->t_canq) >= 0)
+                       ;
+               wakeup((caddr_t)&tp->t_rawq);
+       }
+       if (rw & FWRITE) {
+               wakeup((caddr_t)&tp->t_outq);
+               tp->t_state &= ~TS_TTSTOP;
+               (*cdevsw[major(tp->t_dev)].d_stop)(tp, rw);
+               while (getc(&tp->t_outq) >= 0)
+                       ;
+       }
+       if (rw & FREAD) {
+               while (getc(&tp->t_rawq) >= 0)
+                       ;
+               tp->t_delct = 0;
+               tp->t_rocount = 0;              /* local */
+               tp->t_rocol = 0;
+               tp->t_lstate = 0;
+       }
+       splx(s);
 }
 
 }
 
-gtty()
+/*
+ * Send stop character on input overflow.
+ */
+ttyblock(tp)
+register struct tty *tp;
 {
 {
-       u.u_arg[2] = u.u_arg[1];
-       u.u_arg[1] = TIOCGETP;
-       ioctl();
+       register x;
+       x = tp->t_rawq.c_cc + tp->t_canq.c_cc;
+       if (tp->t_rawq.c_cc > TTYHOG) {
+               flushtty(tp, FREAD|FWRITE);
+               tp->t_state &= ~TS_TBLOCK;
+       }
+       if (x >= TTYHOG/2) {
+               if (putc(tun.t_stopc, &tp->t_outq)==0) {
+                       tp->t_state |= TS_TBLOCK;
+                       tp->t_char++;
+                       ttstart(tp);
+               }
+       }
 }
 
 /*
 }
 
 /*
- * Do nothing specific version of line
- * discipline specific ioctl command.
+ * Restart typewriter output following a delay
+ * timeout.
+ * The name of the routine is passed to the timeout
+ * subroutine and it is called during a clock interrupt.
  */
  */
-/*ARGSUSED*/
-nullioctl(tp, cmd, addr)
+ttrstrt(tp)
 register struct tty *tp;
 register struct tty *tp;
-caddr_t addr;
 {
 
 {
 
-       return (cmd);
+       if (tp == 0) {
+               printf("ttrstrt: arg was 0!\n");
+               return;
+       }
+       tp->t_state &= ~TS_TIMEOUT;
+       ttstart(tp);
 }
 
 /*
 }
 
 /*
- * ioctl system call
- * Check legality, execute common code, and switch out to individual
- * device routine.
+ * Start output on the typewriter. It is used from the top half
+ * after some characters have been put on the output queue,
+ * from the interrupt routine to transmit the next
+ * character, and after a timeout has finished.
  */
  */
-ioctl()
+ttstart(tp)
+register struct tty *tp;
 {
 {
-       register struct file *fp;
-       register struct inode *ip;
-       register struct a {
-               int     fdes;
-               int     cmd;
-               caddr_t cmarg;
-       } *uap;
-       register dev_t dev;
-       register fmt;
-
-       uap = (struct a *)u.u_ap;
-       if ((fp = getf(uap->fdes)) == NULL)
-               return;
-       if (uap->cmd==FIOCLEX) {
-               u.u_pofile[uap->fdes] |= EXCLOSE;
-               return;
-       }
-       if (uap->cmd==FIONCLEX) {
-               u.u_pofile[uap->fdes] &= ~EXCLOSE;
-               return;
-       }
-       ip = fp->f_inode;
-       fmt = ip->i_mode & IFMT;
-       if (fmt != IFCHR && fmt != IFMPC) {
-/* begin local */
-               if (uap->cmd==FIONREAD && (fmt == IFREG || fmt == IFDIR)) {
-                       off_t nread = ip->i_size - fp->f_un.f_offset;
+       register s;
 
 
-                       if (copyout((caddr_t)&nread, uap->cmarg, sizeof(off_t)))
-                               u.u_error = EFAULT;
-               } else
-/* end local */
-                       u.u_error = ENOTTY;
-               return;
-       }
-       dev = ip->i_un.i_rdev;
-       u.u_r.r_val1 = 0;
-       (*cdevsw[major(dev)].d_ioctl)(dev, uap->cmd, uap->cmarg, fp->f_flag);
+       s = spl5();
+       if((tp->t_state&(TS_TIMEOUT|TS_TTSTOP|TS_BUSY)) == 0 &&
+           tp->t_oproc)                /* kludge for pty */
+               (*tp->t_oproc)(tp);
+       splx(s);
 }
 
 /*
 }
 
 /*
- * Common code for several tty ioctl commands
+ * Common code for tty ioctls.
  */
  */
-ttioccomm(com, tp, addr, dev)
+/*ARGSUSED*/
+ttioctl(tp, com, addr, flag)
 register struct tty *tp;
 caddr_t addr;
 {
 register struct tty *tp;
 caddr_t addr;
 {
+       int dev;
        unsigned t;
        struct sgttyb iocb;
        struct clist tq;
        extern int nldisp;
        unsigned t;
        struct sgttyb iocb;
        struct clist tq;
        extern int nldisp;
+       register c;
+       int temp;
 
 
+       /*
+        * This is especially so that isatty() will
+        * fail when carrier is gone.
+        */
+       if ((tp->t_state&TS_CARR_ON) == 0) {
+               u.u_error = EBADF;
+               return (1);
+       }
+
+       dev = tp->t_dev;
+       /*
+        * If the ioctl involves modification,
+        * insist on being able to write the device,
+        * and hang if in the background.
+        */
        switch(com) {
 
        switch(com) {
 
+       case TIOCSETD:
+       case TIOCSETP:
+       case TIOCSETN:
+       case TIOCFLUSH:
+       case TIOCSETC:
+       case TIOCSLTC:
+       case TIOCSPGRP:
+       case TIOCLBIS:
+       case TIOCLBIC:
+       case TIOCLSET:
+       case TIOCSTI:
+/* this is reasonable, but impractical... 
+               if ((flag & FWRITE) == 0) {
+                       u.u_error = EBADF;
+                       return (1);
+               }
+ */
+               while (tp->t_line == NTTYDISC &&
+                  u.u_procp->p_pgrp != tp->t_pgrp && tp == u.u_ttyp &&
+                  (u.u_procp->p_flag&SVFORK) == 0 &&
+                  u.u_signal[SIGTTOU] != SIG_IGN &&
+                  u.u_signal[SIGTTOU] != SIG_HOLD
+/*
+                                                  &&
+                  (u.u_procp->p_flag&SDETACH)==0) {
+*/
+                  ) {
+                       gsignal(u.u_procp->p_pgrp, SIGTTOU);
+                       sleep((caddr_t)&lbolt, TTOPRI);
+               }
+               break;
+       }
+
        /*
        /*
-        * get discipline number
+        * Process the ioctl.
+        */
+       switch(com) {
+
+       /*
+        * Get discipline number
         */
        case TIOCGETD:
                t = tp->t_line;
         */
        case TIOCGETD:
                t = tp->t_line;
@@ -237,7 +314,7 @@ caddr_t addr;
                break;
 
        /*
                break;
 
        /*
-        * set line discipline
+        * Set line discipline
         */
        case TIOCSETD:
                if (copyin(addr, (caddr_t)&t, sizeof(t))) {
         */
        case TIOCSETD:
                if (copyin(addr, (caddr_t)&t, sizeof(t))) {
@@ -259,14 +336,14 @@ caddr_t addr;
                break;
 
        /*
                break;
 
        /*
-        * prevent more opens on channel
+        * Prevent more opens on channel
         */
        case TIOCEXCL:
         */
        case TIOCEXCL:
-               tp->t_state |= XCLUDE;
+               tp->t_state |= TS_XCLUDE;
                break;
 
        case TIOCNXCL:
                break;
 
        case TIOCNXCL:
-               tp->t_state &= ~XCLUDE;
+               tp->t_state &= ~TS_XCLUDE;
                break;
 
        /*
                break;
 
        /*
@@ -279,44 +356,34 @@ caddr_t addr;
                        return(1);
                }
                (void) spl5();
                        return(1);
                }
                (void) spl5();
-               if (tp->t_line == 0) {
-                       if (com == TIOCSETP)
-                               wflushtty(tp);
-                       while (canon(tp)>=0) 
-                               ;
-               } else if (tp->t_line == NTTYDISC) {
-                       if (tp->t_flags&RAW || iocb.sg_flags&RAW ||
-                           com == TIOCSETP)
-                               wflushtty(tp);
-                       else if ((tp->t_flags&CBREAK) != (iocb.sg_flags&CBREAK)) {
-                               if (iocb.sg_flags & CBREAK) {
-                                       catq(&tp->t_rawq, &tp->t_canq);
-                                       tq = tp->t_rawq;
-                                       tp->t_rawq = tp->t_canq;
-                                       tp->t_canq = tq;
-                               } else {
-                                       tp->t_local |= LPENDIN;
-                                       if (tp->t_canq.c_cc)
-                                               panic("ioccom canq");
-                                       if (tp->t_chan)
-                                               (void) sdata(tp->t_chan);
-                                       else
-                                               wakeup((caddr_t)&tp->t_rawq);
-                               }
+               if (tp->t_flags&RAW || iocb.sg_flags&RAW ||
+                   com == TIOCSETP)
+                       wflushtty(tp);
+               else if ((tp->t_flags&CBREAK) != (iocb.sg_flags&CBREAK)) {
+                       if (iocb.sg_flags & CBREAK) {
+                               catq(&tp->t_rawq, &tp->t_canq);
+                               tq = tp->t_rawq;
+                               tp->t_rawq = tp->t_canq;
+                               tp->t_canq = tq;
+                       } else {
+                               tp->t_local |= LPENDIN;
+                               ttwakeup(tp);
                        }
                }
                        }
                }
-               if ((tp->t_state&SPEEDS)==0) {
-                       tp->t_ispeed = iocb.sg_ispeed;
-                       tp->t_ospeed = iocb.sg_ospeed;
-               }
+               tp->t_ispeed = iocb.sg_ispeed;
+               tp->t_ospeed = iocb.sg_ospeed;
                tp->t_erase = iocb.sg_erase;
                tp->t_kill = iocb.sg_kill;
                tp->t_flags = iocb.sg_flags;
                tp->t_erase = iocb.sg_erase;
                tp->t_kill = iocb.sg_kill;
                tp->t_flags = iocb.sg_flags;
+               if (tp->t_flags & RAW) {
+                       tp->t_state &= ~TS_TTSTOP;
+                       ttstart(tp);
+               }
                (void) spl0();
                break;
 
        /*
                (void) spl0();
                break;
 
        /*
-        * send current parameters to user
+        * Send current parameters to user
         */
        case TIOCGETP:
                iocb.sg_ispeed = tp->t_ispeed;
         */
        case TIOCGETP:
                iocb.sg_ispeed = tp->t_ispeed;
@@ -331,26 +398,50 @@ caddr_t addr;
        /*
         * Hang up line on last close
         */
        /*
         * Hang up line on last close
         */
-
        case TIOCHPCL:
        case TIOCHPCL:
-               tp->t_state |= HUPCLS;
+               tp->t_state |= TS_HUPCLS;
                break;
 
                break;
 
-       case TIOCFLUSH:
-               flushtty(tp);
+       case TIOCFLUSH: {
+               int flags;
+               if (addr == 0)
+                       flags = FREAD|FWRITE;
+               else if (copyin(addr, (caddr_t)&flags, sizeof (flags))) {
+                       u.u_error = EFAULT;
+                       return(1);
+               }
+               flushtty(tp, flags);
                break;
                break;
+       }
 
 
-       /*
-        * ioctl entries to line discipline
-        */
-       case DIOCSETP:
-       case DIOCGETP:
-               if ((*linesw[tp->t_line].l_ioctl)(com, tp, addr))
-                       u.u_error = ENOTTY;
+       case FIONBIO: {
+               int nbio;
+               if (copyin(addr, (caddr_t)&nbio, sizeof (nbio))) {
+                       u.u_error = EFAULT;
+                       return(1);
+               }
+               if (nbio)
+                       tp->t_state |= TS_NBIO;
+               else
+                       tp->t_state &= ~TS_NBIO;
                break;
                break;
+       }
+
+       case FIOASYNC: {
+               int async;
+               if (copyin(addr, (caddr_t)&async, sizeof (async))) {
+                       u.u_error = EFAULT;
+                       return(1);
+               }
+               if (async)
+                       tp->t_state |= TS_ASYNC;
+               else
+                       tp->t_state &= ~TS_ASYNC;
+               break;
+       }
 
        /*
 
        /*
-        * set and fetch special characters
+        * Set and fetch special characters
         */
        case TIOCSETC:
                if (copyin(addr, (caddr_t)&tun, sizeof(struct tchars)))
         */
        case TIOCSETC:
                if (copyin(addr, (caddr_t)&tun, sizeof(struct tchars)))
@@ -363,6 +454,9 @@ caddr_t addr;
                break;
 
 /* local ioctls */
                break;
 
 /* local ioctls */
+       /*
+        * Set/get local special characters.
+        */
        case TIOCSLTC:
                if (copyin(addr, (caddr_t)&tlun, sizeof (struct ltchars)))
                        u.u_error = EFAULT;
        case TIOCSLTC:
                if (copyin(addr, (caddr_t)&tlun, sizeof (struct ltchars)))
                        u.u_error = EFAULT;
@@ -373,25 +467,11 @@ caddr_t addr;
                        u.u_error = EFAULT;
                break;
 
                        u.u_error = EFAULT;
                break;
 
+       /*
+        * Return number of characters immediately available.
+        */
        case FIONREAD: {
        case FIONREAD: {
-               off_t nread;
-
-               switch (tp->t_line) {
-
-               case NETLDISC:
-                       nread = tp->t_rec ? tp->t_inbuf : 0;
-                       break;
-
-               case NTTYDISC:
-                       nread = tp->t_canq.c_cc;
-                       if (tp->t_flags & (RAW|CBREAK))
-                               nread += tp->t_rawq.c_cc;
-                       break;
-
-               case 0:
-                       /* do something here ... */
-                       ;
-               }
+               off_t nread = ttnread(tp);
                if (copyout((caddr_t)&nread, addr, sizeof (off_t)))
                        u.u_error = EFAULT;
                break;
                if (copyout((caddr_t)&nread, addr, sizeof (off_t)))
                        u.u_error = EFAULT;
                break;
@@ -401,7 +481,8 @@ caddr_t addr;
         * Should allow SPGRP and GPGRP only if tty open for reading.
         */
        case TIOCSPGRP:
         * Should allow SPGRP and GPGRP only if tty open for reading.
         */
        case TIOCSPGRP:
-               tp->t_pgrp = (int)addr;
+               if (copyin(addr, (caddr_t)&tp->t_pgrp, sizeof (tp->t_pgrp)))
+                       u.u_error = EFAULT;
                break;
 
        case TIOCGPGRP:
                break;
 
        case TIOCGPGRP:
@@ -413,15 +494,24 @@ caddr_t addr;
         * Modify local mode word.
         */
        case TIOCLBIS:
         * Modify local mode word.
         */
        case TIOCLBIS:
-               tp->t_local |= (int)addr;
+               if (copyin(addr, (caddr_t)&temp, sizeof (tp->t_local)))
+                       u.u_error = EFAULT;
+               else
+                       tp->t_local |= temp;
                break;
 
        case TIOCLBIC:
                break;
 
        case TIOCLBIC:
-               tp->t_local &= ~(int)addr;
+               if (copyin(addr, (caddr_t)&temp, sizeof (tp->t_local)))
+                       u.u_error = EFAULT;
+               else
+                       tp->t_local &= ~temp;
                break;
 
        case TIOCLSET:
                break;
 
        case TIOCLSET:
-               tp->t_local = (int)addr;
+               if (copyin(addr, (caddr_t)&temp, sizeof (tp->t_local)))
+                       u.u_error = EFAULT;
+               else
+                       tp->t_local = temp;
                break;
 
        case TIOCLGET:
                break;
 
        case TIOCLGET:
@@ -429,156 +519,167 @@ caddr_t addr;
                        u.u_error = EFAULT;
                break;
 
                        u.u_error = EFAULT;
                break;
 
+       /*
+        * Return number of characters in
+        * the output.
+        */
        case TIOCOUTQ:
                if (copyout((caddr_t)&tp->t_outq.c_cc, addr, sizeof(tp->t_outq.c_cc)))
                        u.u_error = EFAULT;
                break;
 
        case TIOCOUTQ:
                if (copyout((caddr_t)&tp->t_outq.c_cc, addr, sizeof(tp->t_outq.c_cc)))
                        u.u_error = EFAULT;
                break;
 
+       /*
+        * Simulate typing of a character at the terminal.
+        */
+       case TIOCSTI:
+               c = fubyte(addr);
+               if (u.u_uid && u.u_ttyp != tp || c < 0)
+                       u.u_error = EFAULT;
+               else
+                       (*linesw[tp->t_line].l_rint)(c, tp);
+               break;
+
+       case TIOCSTOP:
+               c = spl5();
+               if ((tp->t_state & TS_TTSTOP) == 0) {
+                       tp->t_state |= TS_TTSTOP;
+                       (*cdevsw[major(tp->t_dev)].d_stop)(tp, 0);
+               }
+               splx(c);
+               break;
+
+       case TIOCSTART:
+               c = spl5();
+               if ((tp->t_state & TS_TTSTOP) || (tp->t_local & LFLUSHO)) {
+                       tp->t_state &= ~TS_TTSTOP;
+                       tp->t_local &= ~LFLUSHO;
+                       ttstart(tp);
+               }
+               splx(c);
+               break;
+
 /* end of locals */
 /* end of locals */
+
        default:
                return(0);
        }
        return(1);
 }
 
        default:
                return(0);
        }
        return(1);
 }
 
-/*
- * Wait for output to drain, then flush input waiting.
- */
-wflushtty(tp)
-register struct tty *tp;
+ttnread(tp)
+       struct tty *tp;
 {
 {
+       int nread = 0;
+
+       if (tp->t_local & LPENDIN)
+               ttypend(tp);
+       nread = tp->t_canq.c_cc;
+       if (tp->t_flags & (RAW|CBREAK))
+               nread += tp->t_rawq.c_cc;
+       return (nread);
+}
 
 
-       (void) spl5();
-       while (tp->t_outq.c_cc && tp->t_state&CARR_ON) {
-               (*tp->t_oproc)(tp);
-               tp->t_state |= ASLEEP;
-               sleep((caddr_t)&tp->t_outq, TTOPRI);
+ttselect(dev, rw)
+       dev_t dev;
+       int rw;
+{
+       register struct tty *tp = &cdevsw[major(dev)].d_ttys[minor(dev)];
+       int nread;
+       int s = spl5();
+
+       switch (rw) {
+
+       case FREAD:
+               nread = ttnread(tp);
+               if (nread > 0)
+                       goto win;
+               if (tp->t_rsel && tp->t_rsel->p_wchan == (caddr_t)&selwait)
+                       tp->t_state |= TS_RCOLL;
+               else
+                       tp->t_rsel = u.u_procp;
+               break;
+
+       case FWRITE:
+               if (tp->t_outq.c_cc <= TTLOWAT(tp))
+                       goto win;
+               if (tp->t_wsel && tp->t_wsel->p_wchan == (caddr_t)&selwait)
+                       tp->t_state |= TS_WCOLL;
+               else
+                       tp->t_wsel = u.u_procp;
+               break;
        }
        }
-       flushtty(tp);
-       (void) spl0();
+       splx(s);
+       return (0);
+win:
+       splx(s);
+       return (1);
 }
 
 }
 
+#define        OBUFSIZ 100
+
 /*
 /*
- * flush all TTY queues
+ * routine called on opens while tp->t_line == NTTYDISC
+ * establishes a process group for distribution of
+ * quits and interrupts from the tty.
+ * (actually, pp->p_pgrp can't be 0 when this routine
+ * is called since NTTYDISC is not the default discipline)
  */
  */
-flushtty(tp)
+ttyopen(dev, tp)
+dev_t dev;
 register struct tty *tp;
 {
 register struct tty *tp;
 {
-       register s;
+       register struct proc *pp;
 
 
-       if (tp->t_line == NETLDISC)
-               return;
-       s = spl6();
-       while (getc(&tp->t_canq) >= 0)
-               ;
-       wakeup((caddr_t)&tp->t_rawq);
-       wakeup((caddr_t)&tp->t_outq);
-       tp->t_state &= ~TTSTOP;
-       (*cdevsw[major(tp->t_dev)].d_stop)(tp);
-       while (getc(&tp->t_outq) >= 0)
-               ;
-       while (getc(&tp->t_rawq) >= 0)
-               ;
-       tp->t_delct = 0;
-       tp->t_rocount = 0;              /* local */
-       tp->t_lstate = 0;
-       splx(s);
+       pp = u.u_procp;
+       tp->t_dev = dev;
+       if(pp->p_pgrp == 0) {
+               u.u_ttyp = tp;
+               u.u_ttyd = dev;
+               if (tp->t_pgrp == 0)
+                       tp->t_pgrp = pp->p_pid;
+               pp->p_pgrp = tp->t_pgrp;
+       }
+       tp->t_state &= ~TS_WOPEN;
+       tp->t_state |= TS_ISOPEN;
+       if (tp->t_line != NTTYDISC)
+               wflushtty(tp);
 }
 
 }
 
-
-
 /*
 /*
- * transfer raw input list to canonical list,
- * doing erase-kill processing and handling escapes.
- * It waits until a full line has been typed in cooked mode,
- * or until any character has been typed in raw mode.
+ * clean tp on last close
  */
  */
-canon(tp)
+ttyclose(tp)
 register struct tty *tp;
 {
 register struct tty *tp;
 {
-       register char *bp;
-       char *bp1;
-       register int c;
-       int mc;
-       int s;
-
-       if ((tp->t_flags&(RAW|CBREAK))==0 && tp->t_delct==0
-           || (tp->t_flags&(RAW|CBREAK))!=0 && tp->t_rawq.c_cc==0) {
-               return(-1);
-       }
-       s = spl0();
-loop:
-       bp = &canonb[2];
-       while ((c=getc(&tp->t_rawq)) >= 0) {
-               if ((tp->t_flags&(RAW|CBREAK))==0) {
-                       if (c==0377) {
-                               tp->t_delct--;
-                               break;
-                       }
-                       if (bp[-1]!='\\') {
-                               if (c==tp->t_erase) {
-                                       if (bp > &canonb[2])
-                                               bp--;
-                                       continue;
-                               }
-                               if (c==tp->t_kill)
-                                       goto loop;
-                               if (c==tun.t_eofc)
-                                       continue;
-                       } else {
-                               mc = maptab[c];
-                               if (c==tp->t_erase || c==tp->t_kill)
-                                       mc = c;
-                               if (mc && (mc==c || (tp->t_flags&LCASE))) {
-                                       if (bp[-2] != '\\')
-                                               c = mc;
-                                       bp--;
-                               }
-                       }
-               }
-               *bp++ = c;
-               if (bp>=canonb+CANBSIZ)
-                       break;
-       }
-       bp1 = &canonb[2];
-       (void) b_to_q(bp1, bp-bp1, &tp->t_canq);
 
 
-       if (tp->t_state&TBLOCK && tp->t_rawq.c_cc < TTYHOG/5) {
-               if (putc(tun.t_startc, &tp->t_outq)==0) {
-                       tp->t_state &= ~TBLOCK;
-                       ttstart(tp);
-               }
-               tp->t_char = 0;
+       if (tp->t_line) {
+               wflushtty(tp);
+               tp->t_line = 0;
+               return;
        }
        }
-
-       splx(s);
-       return(0);
+       tp->t_pgrp = 0;
+       wflushtty(tp);
+       tp->t_state = 0;
 }
 
 }
 
-
 /*
 /*
- * block transfer input handler.
+ * reinput pending characters after state switch
+ * call at spl5().
  */
  */
-ttyrend(tp, pb, pe)
+ttypend(tp)
 register struct tty *tp;
 register struct tty *tp;
-register char *pb, *pe;
 {
 {
-       int     tandem;
-
-       tandem = tp->t_flags&TANDEM;
-       if (tp->t_flags&RAW) {
-               (void) b_to_q(pb, pe-pb, &tp->t_rawq);
-               if (tp->t_chan)
-                       (void) sdata(tp->t_chan); else
-                       wakeup((caddr_t)&tp->t_rawq);
-       } else {
-               tp->t_flags &= ~TANDEM;
-               while (pb < pe)
-                       ttyinput(*pb++, tp);
-               tp->t_flags |= tandem;
-       }
-       if (tandem)
-               ttyblock(tp);
+       struct clist tq;
+       register c;
+
+       tp->t_local &= ~LPENDIN;
+       tp->t_lstate |= LSTYPEN;
+       tq = tp->t_rawq;
+       tp->t_rawq.c_cc = 0;
+       tp->t_rawq.c_cf = tp->t_rawq.c_cl = 0;
+       while ((c = getc(&tq)) >= 0)
+               ttyinput(c, tp);
+       tp->t_lstate &= ~LSTYPEN;
 }
 
 /*
 }
 
 /*
@@ -593,88 +694,163 @@ register c;
 register struct tty *tp;
 {
        register int t_flags;
 register struct tty *tp;
 {
        register int t_flags;
-       register struct chan *cp;
+       int i;
 
 
-       tk_nin += 1;
+       if (tp->t_local&LPENDIN)
+               ttypend(tp);
+       tk_nin++;
        c &= 0377;
        t_flags = tp->t_flags;
        if (t_flags&TANDEM)
                ttyblock(tp);
        if ((t_flags&RAW)==0) {
        c &= 0377;
        t_flags = tp->t_flags;
        if (t_flags&TANDEM)
                ttyblock(tp);
        if ((t_flags&RAW)==0) {
-               c &= 0177;
-               if (tp->t_state&TTSTOP) {
-                       if (c==tun.t_startc) {
-                               tp->t_state &= ~TTSTOP;
-                               ttstart(tp);
+               if ((tp->t_lstate&LSTYPEN) == 0)
+                       c &= 0177;
+       /* check for literal nexting very first */
+               if (tp->t_lstate&LSLNCH) {
+                       c |= 0200;
+                       tp->t_lstate &= ~LSLNCH;
+               }
+               if (tp->t_line == NTTYDISC && c==tlun.t_lnextc) {
+                       if (tp->t_flags&ECHO)
+                               ttyout("^\b", tp);
+                       tp->t_lstate |= LSLNCH;
+       /* check for output control functions */
+               } else if (c==tun.t_stopc) {
+                       if ((tp->t_state&TS_TTSTOP)==0) {
+                               tp->t_state |= TS_TTSTOP;
+                               (*cdevsw[major(tp->t_dev)].d_stop)(tp, 0);
                                return;
                        }
                                return;
                        }
-                       if (c==tun.t_stopc)
+                       if (c!=tun.t_startc)
                                return;
                                return;
-                       tp->t_state &= ~TTSTOP;
+               } else if (c==tun.t_startc) {
+                       tp->t_state &= ~TS_TTSTOP;
+                       tp->t_local &= ~LFLUSHO;
                        ttstart(tp);
                        ttstart(tp);
-               } else {
-                       if (c==tun.t_stopc) {
-                               tp->t_state |= TTSTOP;
-                               (*cdevsw[major(tp->t_dev)].d_stop)(tp);
-                               return;
+                       return;
+               } else if (tp->t_line == NTTYDISC && c==tlun.t_flushc) {
+                       if (tp->t_local & LFLUSHO)
+                               tp->t_local &= ~LFLUSHO;
+                       else {
+                               flushtty(tp, FWRITE);
+                               ttyecho(c, tp);
+                               if (tp->t_rawq.c_cc+tp->t_canq.c_cc)
+                                       ttyretype(tp);
+                               tp->t_local |= LFLUSHO;
                        }
                        }
-                       if (c==tun.t_startc)
-                               return;
-               }
-               if (c==tun.t_quitc || c==tun.t_intrc) {
-                       flushtty(tp);
-                       c = (c==tun.t_intrc) ? SIGINT:SIGQUIT;
-                       if (tp->t_chan)
-                               scontrol(tp->t_chan, M_SIG, c);
-                       else
-                               gsignal(tp->t_pgrp, c);
+                       ttstart(tp);
                        return;
                        return;
+               } else if (c==tun.t_intrc || c==tun.t_quitc ||
+                   (tp->t_line == NTTYDISC && c==tlun.t_suspc)) {
+                       if ((tp->t_local & LNOFLSH) == 0)
+                               flushtty(tp,
+                                   c==tlun.t_suspc ? FREAD : FREAD|FWRITE);
+                       ttyecho(c, tp);
+                       c = c==tun.t_intrc ? SIGINT :
+                               ((c==tun.t_quitc) ? SIGQUIT : SIGTSTP);
+                       ttsignal(tp, c);
+       /* check for buffer editing functions - cooked mode */
+               } else if ((t_flags&CBREAK) == 0) {
+                       if ((tp->t_lstate&LSQUOT) &&
+                           (c==tp->t_erase||c==tp->t_kill)) {
+                               ttyrub(unputc(&tp->t_rawq), tp);
+                               c |= 0200;
+                       }
+                       if (c==tp->t_erase) {
+                               if (tp->t_rawq.c_cc)
+                                       ttyrub(unputc(&tp->t_rawq), tp);
+                       } else if (c==tp->t_kill) {
+                               if (tp->t_local&LCRTKIL &&
+                                   tp->t_rawq.c_cc == tp->t_rocount) {
+                                       while (tp->t_rawq.c_cc)
+                                               ttyrub(unputc(&tp->t_rawq), tp);
+                               } else {
+                                       ttyecho(c, tp);
+                                       ttyecho('\n', tp);
+                                       while (getc(&tp->t_rawq) > 0)
+                                               ;
+                                       tp->t_rocount = 0;
+                               }
+                               tp->t_lstate = 0;
+                       } else if (tp->t_line == NTTYDISC && c==tlun.t_werasc) {
+                               if (tp->t_rawq.c_cc == 0)
+                                       goto out;
+                               do {
+                                       c = unputc(&tp->t_rawq);
+                                       if (c != ' ' && c != '\t')
+                                               goto erasenb;
+                                       ttyrub(c, tp);
+                               } while (tp->t_rawq.c_cc);
+                               goto out;
+                           erasenb:
+                               do {
+                                       ttyrub(c, tp);
+                                       if (tp->t_rawq.c_cc == 0)
+                                               goto out;
+                                       c = unputc(&tp->t_rawq);
+                               } while (c != ' ' && c != '\t');
+                               (void) putc(c, &tp->t_rawq);
+                       } else if (tp->t_line == NTTYDISC && c==tlun.t_rprntc) {
+                               ttyretype(tp);
+       /* check for cooked mode input buffer overflow */
+                       } else if (tp->t_rawq.c_cc+tp->t_canq.c_cc >= TTYHOG) {
+                               ;
+       /* put data char in q for user and wakeup if a break char */
+                       } else if (putc(c, &tp->t_rawq) >= 0) {
+                               if (tp->t_rawq.c_cc+tp->t_canq.c_cc==TTYHOG
+                                   && tp->t_line == NTTYDISC)
+                                       (void) ttyoutput(CTRL(g), tp);
+                               if (!ttbreakc(c, tp)) {
+                                       if (tp->t_rocount++ == 0)
+                                               tp->t_rocol = tp->t_col;
+                               } else {
+                                       tp->t_rocount = 0;
+                                       catq(&tp->t_rawq, &tp->t_canq);
+                                       /* IF (TP->T_CHAN) (VOID) SDATA(TP->T_CHAN); */
+                                       ttwakeup(tp);
+                               }
+                               tp->t_lstate &= ~LSQUOT;
+                               if (c == '\\')
+                                       tp->t_lstate |= LSQUOT;
+                               if (tp->t_lstate&LSERASE) {
+                                       tp->t_lstate &= ~LSERASE;
+                                       (void) ttyoutput('/', tp);
+                               }
+                               i = tp->t_col;
+                               ttyecho(c, tp);
+                               if (c==tun.t_eofc && tp->t_flags&ECHO) {
+                                       i = MIN(2, tp->t_col - i);
+                                       while (i > 0) {
+                                               (void) ttyoutput('\b', tp);
+                                               i--;
+                                       }
+                               }
+                       }
+       /* CBREAK mode */
+               } else if (tp->t_rawq.c_cc > TTYHOG) {
+                       if (tp->t_outq.c_cc < TTHIWAT(tp) &&
+                           tp->t_line == NTTYDISC)
+                               (void) ttyoutput(CTRL(g), tp);
+               } else if (putc(c, &tp->t_rawq) >= 0) {
+                       ttwakeup(tp);
+                       ttyecho(c, tp);
                }
                }
-               if (c=='\r' && t_flags&CRMOD)
-                       c = '\n';
+       /* RAW mode */
+       } else if (tp->t_rawq.c_cc > TTYHOG) 
+               flushtty(tp, FREAD|FWRITE);
+       else {
+               if (putc(c, &tp->t_rawq) >= 0)
+                       ttwakeup(tp);
+               ttyecho(c, tp);
        }
        }
-       if (tp->t_rawq.c_cc>TTYHOG) {
-               flushtty(tp);
+out:
+       if (tp->t_local & LDECCTQ && tp->t_state & TS_TTSTOP &&
+           tun.t_startc != tun.t_stopc)
                return;
                return;
-       }
-       if (t_flags&LCASE && c>='A' && c<='Z')
-               c += 'a'-'A';
-       (void) putc(c, &tp->t_rawq);
-       if (t_flags&(RAW|CBREAK)||(c=='\n'||c==tun.t_eofc||c==tun.t_brkc)) {
-               if ((t_flags&(RAW|CBREAK))==0 && putc(0377, &tp->t_rawq)==0)
-                       tp->t_delct++;
-               if ((cp=tp->t_chan)!=NULL)
-                       (void) sdata(cp); else
-                       wakeup((caddr_t)&tp->t_rawq);
-       }
-       if (t_flags&ECHO) {
-               ttyoutput(c, tp);
-               if (c==tp->t_kill && (t_flags&(RAW|CBREAK))==0)
-                       ttyoutput('\n', tp);
-               ttstart(tp);
-       }
-}
-
-
-/*
- * Send stop character on input overflow.
- */
-ttyblock(tp)
-register struct tty *tp;
-{
-       register x;
-       x = q1.c_cc + q2.c_cc;
-       if (q1.c_cc > TTYHOG) {
-               flushtty(tp);
-               tp->t_state &= ~TBLOCK;
-       }
-       if (x >= TTYHOG/2) {
-               if (putc(tun.t_stopc, &tp->t_outq)==0) {
-                       tp->t_state |= TBLOCK;
-                       tp->t_char++;
-                       ttstart(tp);
-               }
-       }
+       tp->t_state &= ~TS_TTSTOP;
+       tp->t_local &= ~LFLUSHO;
+       ttstart(tp);
 }
 
 /*
 }
 
 /*
@@ -683,38 +859,46 @@ register struct tty *tp;
  * It is called both from the top half for output, and from
  * interrupt level for echoing.
  * The arguments are the character and the tty structure.
  * It is called both from the top half for output, and from
  * interrupt level for echoing.
  * The arguments are the character and the tty structure.
+ * Returns < 0 if putc succeeds, otherwise returns char to resend
+ * Must be recursive.
  */
 ttyoutput(c, tp)
  */
 ttyoutput(c, tp)
-register c;
-register struct tty *tp;
+       register c;
+       register struct tty *tp;
 {
        register char *colp;
        register ctype;
 
 {
        register char *colp;
        register ctype;
 
+       if (tp->t_flags&RAW || tp->t_local&LLITOUT) {
+               if (tp->t_local&LFLUSHO)
+                       return (-1);
+               if (putc(c, &tp->t_outq))
+                       return(c);
+               tk_nout++;
+               return (-1);
+       }
        /*
         * Ignore EOT in normal mode to avoid hanging up
         * certain terminals.
        /*
         * Ignore EOT in normal mode to avoid hanging up
         * certain terminals.
-        * In raw mode dump the char unchanged.
         */
         */
-       if ((tp->t_flags&RAW)==0) {
-               c &= 0177;
-               if ((tp->t_flags&CBREAK)==0 && c==CEOT)
-                       return;
-       } else {
-               tk_nout++;
-               (void) putc(c, &tp->t_outq);
-               return;
-       }
-
+       c &= 0177;
+       if (c==CEOT && (tp->t_flags&CBREAK)==0)
+               return (-1);
        /*
         * Turn tabs to spaces as required
         */
        if (c=='\t' && (tp->t_flags&TBDELAY)==XTABS) {
        /*
         * Turn tabs to spaces as required
         */
        if (c=='\t' && (tp->t_flags&TBDELAY)==XTABS) {
-               c = 8 - (tp->t_col & 7);
-               (void) b_to_q("        ", c, &tp->t_outq);
+               register int s;
+
+               c = 8 - (tp->t_col&7);
+               if ((tp->t_local&LFLUSHO) == 0) {
+                       s = spl5();             /* don't interrupt tabs */
+                       c -= b_to_q("        ", c, &tp->t_outq);
+                       tk_nout += c;
+                       splx(s);
+               }
                tp->t_col += c;
                tp->t_col += c;
-               tk_nout += c;
-               return;
+               return (c ? -1 : '\t');
        }
        tk_nout++;
        /*
        }
        tk_nout++;
        /*
@@ -725,19 +909,27 @@ register struct tty *tp;
                colp = "({)}!|^~'`";
                while(*colp++)
                        if(c == *colp++) {
                colp = "({)}!|^~'`";
                while(*colp++)
                        if(c == *colp++) {
-                               ttyoutput('\\', tp);
+                               if (ttyoutput('\\', tp) >= 0)
+                                       return (c);
                                c = colp[-2];
                                break;
                        }
                                c = colp[-2];
                                break;
                        }
-               if ('a'<=c && c<='z')
+               if ('A'<=c && c<='Z') {
+                       if (ttyoutput('\\', tp) >= 0)
+                               return (c);
+               } else if ('a'<=c && c<='z')
                        c += 'A' - 'a';
        }
        /*
         * turn <nl> to <cr><lf> if desired.
         */
        if (c=='\n' && tp->t_flags&CRMOD)
                        c += 'A' - 'a';
        }
        /*
         * turn <nl> to <cr><lf> if desired.
         */
        if (c=='\n' && tp->t_flags&CRMOD)
-               ttyoutput('\r', tp);
-       (void) putc(c, &tp->t_outq);
+               if (ttyoutput('\r', tp) >= 0)
+                       return (c);
+       if (c=='~' && tp->t_local&LTILDE)
+               c = '`';
+       if ((tp->t_local&LFLUSHO) == 0 && putc(c, &tp->t_outq))
+               return (c);
        /*
         * Calculate delays.
         * The numbers here represent clock ticks
        /*
         * Calculate delays.
         * The numbers here represent clock ticks
@@ -751,22 +943,18 @@ register struct tty *tp;
        c = 0;
        switch (ctype&077) {
 
        c = 0;
        switch (ctype&077) {
 
-       /* ordinary */
-       case 0:
+       case ORDINARY:
                (*colp)++;
 
                (*colp)++;
 
-       /* non-printing */
-       case 1:
+       case CONTROL:
                break;
 
                break;
 
-       /* backspace */
-       case 2:
+       case BACKSPACE:
                if (*colp)
                        (*colp)--;
                break;
 
                if (*colp)
                        (*colp)--;
                break;
 
-       /* newline */
-       case 3:
+       case NEWLINE:
                ctype = (tp->t_flags >> 8) & 03;
                if(ctype == 1) { /* tty 37 */
                        if (*colp)
                ctype = (tp->t_flags >> 8) & 03;
                if(ctype == 1) { /* tty 37 */
                        if (*colp)
@@ -778,8 +966,7 @@ register struct tty *tp;
                *colp = 0;
                break;
 
                *colp = 0;
                break;
 
-       /* tab */
-       case 4:
+       case TAB:
                ctype = (tp->t_flags >> 10) & 03;
                if(ctype == 1) { /* tty 37 */
                        c = 1 - (*colp | ~07);
                ctype = (tp->t_flags >> 10) & 03;
                if(ctype == 1) { /* tty 37 */
                        c = 1 - (*colp | ~07);
@@ -790,14 +977,12 @@ register struct tty *tp;
                (*colp)++;
                break;
 
                (*colp)++;
                break;
 
-       /* vertical motion */
-       case 5:
+       case VTAB:
                if(tp->t_flags & VTDELAY) /* tty 37 */
                        c = 0177;
                break;
 
                if(tp->t_flags & VTDELAY) /* tty 37 */
                        c = 0177;
                break;
 
-       /* carriage return */
-       case 6:
+       case RETURN:
                ctype = (tp->t_flags >> 12) & 03;
                if(ctype == 1) { /* tn 300 */
                        c = 5;
                ctype = (tp->t_flags >> 12) & 03;
                if(ctype == 1) { /* tn 300 */
                        c = 5;
@@ -805,44 +990,15 @@ register struct tty *tp;
                        c = 10;
                } else if(ctype == 3) { /* concept 100 */
                        int i;
                        c = 10;
                } else if(ctype == 3) { /* concept 100 */
                        int i;
-                       for (i= *colp; i<9; i++)
-                               (void) putc(0177, &tp->t_outq);
+                       if ((i = *colp) >= 0)
+                               for (; i<9; i++)
+                                       (void) putc(0177, &tp->t_outq);
                }
                *colp = 0;
        }
                }
                *colp = 0;
        }
-       if(c)
+       if(c && (tp->t_local&LFLUSHO) == 0)
                (void) putc(c|0200, &tp->t_outq);
                (void) putc(c|0200, &tp->t_outq);
-}
-
-/*
- * Restart typewriter output following a delay
- * timeout.
- * The name of the routine is passed to the timeout
- * subroutine and it is called during a clock interrupt.
- */
-ttrstrt(tp)
-register struct tty *tp;
-{
-
-       tp->t_state &= ~TIMEOUT;
-       ttstart(tp);
-}
-
-/*
- * Start output on the typewriter. It is used from the top half
- * after some characters have been put on the output queue,
- * from the interrupt routine to transmit the next
- * character, and after a timeout has finished.
- */
-ttstart(tp)
-register struct tty *tp;
-{
-       register s;
-
-       s = spl5();
-       if((tp->t_state&(TIMEOUT|TTSTOP|BUSY)) == 0)
-               (*tp->t_oproc)(tp);
-       splx(s);
+       return (-1);
 }
 
 /*
 }
 
 /*
@@ -852,23 +1008,100 @@ register struct tty *tp;
 ttread(tp)
 register struct tty *tp;
 {
 ttread(tp)
 register struct tty *tp;
 {
-register s;
+       register struct clist *qp;
+       register c, first;
 
 
-       if ((tp->t_state&CARR_ON)==0)
-               return(-1);
-       s = spl5();
-       if (tp->t_canq.c_cc==0)
-               while (canon(tp)<0)
-                       if (tp->t_chan==NULL) {
-                               sleep((caddr_t)&tp->t_rawq, TTIPRI); 
-                       } else {
-                               splx(s);
-                               return(0);
+       if ((tp->t_state&TS_CARR_ON)==0)
+               return(0);
+loop:
+       (void) spl5();
+       if (tp->t_local&LPENDIN)
+               ttypend(tp);
+       (void) spl0();
+       while (tp == u.u_ttyp && u.u_procp->p_pgrp != tp->t_pgrp) {
+               if (u.u_signal[SIGTTIN] == SIG_IGN ||
+                   u.u_signal[SIGTTIN] == SIG_HOLD ||
+/*
+                   (u.u_procp->p_flag&SDETACH) ||
+*/
+                   u.u_procp->p_flag&SVFORK)
+                       return (0);
+               gsignal(u.u_procp->p_pgrp, SIGTTIN);
+               sleep((caddr_t)&lbolt, TTIPRI);
+       }
+       if (tp->t_flags&RAW) {
+               (void) spl5();
+               if (tp->t_rawq.c_cc <= 0) {
+                       if ((tp->t_state&TS_CARR_ON)==0 ||
+                           (tp->t_state&TS_NBIO)) {
+                               (void) spl0();
+                               return (0);
                        }
                        }
-       splx(s);
-       while (tp->t_canq.c_cc && passc(getc(&tp->t_canq))>=0)
+                       sleep((caddr_t)&tp->t_rawq, TTIPRI);
+                       (void) spl0();
+                       goto loop;
+               }
+               (void) spl0();
+               while (tp->t_rawq.c_cc && passc(getc(&tp->t_rawq))>=0)
                        ;
                        ;
-       return(tp->t_rawq.c_cc+tp->t_canq.c_cc);
+               return (0);
+       } else {
+               qp = tp->t_flags & CBREAK ? &tp->t_rawq : &tp->t_canq;
+               (void) spl5();
+               if (qp->c_cc <= 0) {
+                       if ((tp->t_state&TS_CARR_ON)==0 ||
+                           (tp->t_state&TS_NBIO)) {
+                               (void) spl0();
+                               return (0);
+                       }
+                       sleep((caddr_t)&tp->t_rawq, TTIPRI);
+                       (void) spl0();
+                       goto loop;
+               }
+               (void) spl0();
+               first = 1;
+               while ((c = getc(qp)) >= 0) {
+                       if (tp->t_flags&CRMOD && c == '\r')
+                               c = '\n';
+                       if (tp->t_flags&LCASE && c <= 0177)
+                               if (tp->t_lstate&LSBKSL) {
+                                       if (maptab[c])
+                                               c = maptab[c];
+                                       tp->t_lstate &= ~LSBKSL;
+                               } else if (c >= 'A' && c <= 'Z')
+                                       c += 'a' - 'A';
+                               else if (c == '\\') {
+                                       tp->t_lstate |= LSBKSL;
+                                       continue;
+                               }
+                       if (c == tlun.t_dsuspc) {
+                               ttsignal(tp, SIGTSTP);
+                               if (first) {
+                                       sleep((caddr_t)&lbolt, TTIPRI);
+                                       goto loop;
+                               }
+                               break;
+                       }
+                       if (c == tun.t_eofc && (tp->t_flags&CBREAK)==0)
+                               break;
+                       if (passc(c & 0177) < 0)
+                               break;
+                       if ((tp->t_flags&CBREAK)==0 && ttbreakc(c, tp))
+                               break;
+                       first = 0;
+               }
+               tp->t_lstate &= ~LSBKSL;
+       }
+
+       if (tp->t_state&TS_TBLOCK && tp->t_rawq.c_cc < TTYHOG/5) {
+               if (putc(tun.t_startc, &tp->t_outq)==0) {
+                       tp->t_state &= ~TS_TBLOCK;
+                       ttstart(tp);
+               }
+               tp->t_char = 0;
+       }
+
+       return (tp->t_rawq.c_cc + tp->t_canq.c_cc);
 }
 
 /*
 }
 
 /*
@@ -879,79 +1112,324 @@ caddr_t
 ttwrite(tp)
 register struct tty *tp;
 {
 ttwrite(tp)
 register struct tty *tp;
 {
+#ifdef vax
        /*
         * THE POSITIONING OF CP, CC, AND CE ARE CRITICAL
         * AND MUST NOT BE CHANGED WITHOUT PATCHING
         * THE 'ASM' INLINES BELOW.  WATCH OUT.
         */
        /*
         * THE POSITIONING OF CP, CC, AND CE ARE CRITICAL
         * AND MUST NOT BE CHANGED WITHOUT PATCHING
         * THE 'ASM' INLINES BELOW.  WATCH OUT.
         */
+#endif
        register char *cp;
        register int cc, ce;
        register i;
        char obuf[OBUFSIZ];
        register char *cp;
        register int cc, ce;
        register i;
        char obuf[OBUFSIZ];
+       register c;
+       int hiwat = TTHIWAT(tp);
+       int cnt = u.u_count;
 
 
-       if ((tp->t_state&CARR_ON)==0)
-               return(NULL);
+       if ((tp->t_state&TS_CARR_ON)==0)
+               return (NULL);
+loop:
+       while (u.u_procp->p_pgrp != tp->t_pgrp && tp == u.u_ttyp &&
+           (tp->t_local&LTOSTOP) && (u.u_procp->p_flag&SVFORK)==0 &&
+           u.u_signal[SIGTTOU] != SIG_IGN &&
+           u.u_signal[SIGTTOU] != SIG_HOLD
+/*
+                                            &&
+           (u.u_procp->p_flag&SDETACH)==0) {
+*/
+           ) {
+               gsignal(u.u_procp->p_pgrp, SIGTTOU);
+               sleep((caddr_t)&lbolt, TTIPRI);
+       }
        while (u.u_count) {
                cc = MIN(u.u_count, OBUFSIZ);
                cp = obuf;
                iomove(cp, (unsigned)cc, B_WRITE);
                if (u.u_error)
                        break;
        while (u.u_count) {
                cc = MIN(u.u_count, OBUFSIZ);
                cp = obuf;
                iomove(cp, (unsigned)cc, B_WRITE);
                if (u.u_error)
                        break;
-               (void) spl5();
-               while (tp->t_outq.c_cc > TTHIWAT) {
-                       ttstart(tp);
-                       tp->t_state |= ASLEEP;
-                       if (tp->t_chan) {
-                               u.u_base -= cc;
-                               u.u_offset -= cc;
-                               u.u_count += cc;
-                               (void) spl0();
-                               return((caddr_t)&tp->t_outq);
+               if (tp->t_outq.c_cc > hiwat)
+                       goto ovhiwat;
+               if (tp->t_local&LFLUSHO)
+                       continue;
+               if (tp->t_flags&LCASE || tp->t_local&LTILDE) {
+                       while (cc) {
+                               c = *cp++;
+                               tp->t_rocount = 0;
+                               while((c = ttyoutput(c, tp)) >= 0) {
+                                       /* out of clists, wait a bit */
+                                       ttstart(tp);
+                                       sleep((caddr_t)&lbolt, TTOPRI);
+                                       tp->t_rocount = 0;
+                               }
+                               --cc;
+                               if (tp->t_outq.c_cc > hiwat)
+                                       goto ovhiwat;
                        }
                        }
-                       sleep((caddr_t)&tp->t_outq, TTOPRI);
-               }
-               (void) spl0();
-               if (tp->t_flags&LCASE) {
-                       while (cc--)
-                               ttyoutput(*cp++,tp);
                        continue;
                }
                while (cc) {
                        continue;
                }
                while (cc) {
-                       if (tp->t_flags&RAW)
-                               ce=cc;
+                       if (tp->t_flags&RAW || tp->t_local&LLITOUT)
+                               ce = cc;
                        else {
                        else {
-#ifdef VAX
+#ifdef vax
                                asm("   scanc   r9,(r10),_partab,$077");
                                asm("   subl3   r0,r9,r8");
 #else
                                ce=0;
                                asm("   scanc   r9,(r10),_partab,$077");
                                asm("   subl3   r0,r9,r8");
 #else
                                ce=0;
-                               while(((partab[*(cp+ce)]&077)==0)&&(ce<cc))
+                               while(((partab[*(unsigned char *)(cp+ce)]&077)==0)&&(ce<cc))
                                        ce++;
 #endif
                                if (ce==0) {
                                        ce++;
 #endif
                                if (ce==0) {
-                                       ttyoutput(*cp++,tp);
+                                       tp->t_rocount = 0;
+                                       if (ttyoutput(*cp, tp) >= 0) {
+                                               ttstart(tp);
+                                               sleep((caddr_t)&lbolt, TTOPRI);
+                                               continue;
+                                       }
+                                       cp++;
                                        cc--;
                                        cc--;
-                                       goto check;
+                                       if (tp->t_outq.c_cc > hiwat)
+                                               goto ovhiwat;
                                }
                        }
                                }
                        }
+                       tp->t_rocount = 0;
                        i=b_to_q(cp,ce,&tp->t_outq);
                        ce-=i;
                        tk_nout+=ce;
                        tp->t_col+=ce;
                        cp+=ce;
                        cc-=ce;
                        i=b_to_q(cp,ce,&tp->t_outq);
                        ce-=i;
                        tk_nout+=ce;
                        tp->t_col+=ce;
                        cp+=ce;
                        cc-=ce;
-check:
-                       if (tp->t_outq.c_cc > TTHIWAT) {
-                               (void) spl5();
-                               while (tp->t_outq.c_cc > TTHIWAT) {
-                                       ttstart(tp);
-                                       tp->t_state |= ASLEEP;
-                                       sleep((caddr_t)&tp->t_outq, TTOPRI);
-                               }
-                               (void) spl0();
+                       if (i) {
+                               ttstart(tp);
+                               sleep((caddr_t)&lbolt, TTOPRI);
                        }
                        }
+                       if (ce || tp->t_outq.c_cc > hiwat)
+                               goto ovhiwat;
                }
        }
        ttstart(tp);
        return(NULL);
                }
        }
        ttstart(tp);
        return(NULL);
+
+ovhiwat:
+       (void) spl5();
+       u.u_base -= cc;
+       u.u_offset -= cc;
+       u.u_count += cc;
+       if (tp->t_outq.c_cc <= hiwat) {
+               (void) spl0();
+               goto loop;
+       }
+       ttstart(tp);
+       if (tp->t_state & TS_NBIO) {
+               if (u.u_count == cnt)
+                       u.u_error = EWOULDBLOCK;
+               return (NULL);
+       }
+       tp->t_state |= TS_ASLEEP;
+       sleep((caddr_t)&tp->t_outq, TTOPRI);
+       (void) spl0();
+       goto loop;
+}
+
+/*
+ * Rubout one character from the rawq of tp
+ * as cleanly as possible.
+ */
+ttyrub(c, tp)
+register c;
+register struct tty *tp;
+{
+       register char *cp;
+       register int savecol;
+       int s;
+       char *nextc();
+
+       if ((tp->t_flags&ECHO)==0)
+               return;
+       tp->t_local &= ~LFLUSHO;
+       c &= 0377;
+       if (tp->t_local&LCRTBS) {
+               if (tp->t_rocount == 0) {
+                       /*
+                        * Screwed by ttwrite; retype
+                        */
+                       ttyretype(tp);
+                       return;
+               }
+               if (c==('\t'|0200) || c==('\n'|0200))
+                       ttyrubo(tp, 2);
+               else switch(partab[c&=0177] & 0177) {
+
+               case ORDINARY:
+                       if (tp->t_flags&LCASE && c >= 'A' && c <= 'Z')
+                               ttyrubo(tp, 2);
+                       else
+                               ttyrubo(tp, 1);
+                       break;
+
+               case VTAB:
+               case BACKSPACE:
+               case CONTROL:
+               case RETURN:
+                       if (tp->t_local & LCTLECH)
+                               ttyrubo(tp, 2);
+                       break;
+
+               case TAB:
+                       if (tp->t_rocount < tp->t_rawq.c_cc) {
+                               ttyretype(tp);
+                               return;
+                       }
+                       s = spl5();
+                       savecol = tp->t_col;
+                       tp->t_lstate |= LSCNTTB;
+                       tp->t_local |= LFLUSHO;
+                       tp->t_col = tp->t_rocol;
+                       for (cp = tp->t_rawq.c_cf; cp; cp = nextc(&tp->t_rawq, cp))
+                               ttyecho(*cp, tp);
+                       tp->t_local &= ~LFLUSHO;
+                       tp->t_lstate &= ~LSCNTTB;
+                       splx(s);
+                       /*
+                        * savecol will now be length of the tab
+                        */
+                       savecol -= tp->t_col;
+                       tp->t_col += savecol;
+                       if (savecol > 8)
+                               savecol = 8;            /* overflow screw */
+                       while (--savecol >= 0)
+                               (void) ttyoutput('\b', tp);
+                       break;
+
+               default:
+                       panic("ttyrub");
+               }
+       } else if (tp->t_local&LPRTERA) {
+               if ((tp->t_lstate&LSERASE) == 0) {
+                       (void) ttyoutput('\\', tp);
+                       tp->t_lstate |= LSERASE;
+               }
+               ttyecho(c, tp);
+       } else
+               ttyecho(tp->t_erase, tp);
+       tp->t_rocount--;
+}
+
+/*
+ * Crt back over cnt chars perhaps
+ * erasing them.
+ */
+ttyrubo(tp, cnt)
+register struct tty *tp;
+int cnt;
+{
+
+       while (--cnt >= 0)
+               ttyout(tp->t_local&LCRTERA ? "\b \b" : "\b", tp);
+}
+
+/*
+ * Reprint the rawq line.
+ * We assume c_cc has already been checked.
+ */
+ttyretype(tp)
+register struct tty *tp;
+{
+       register char *cp;
+       char *nextc();
+       int s;
+
+       if (tlun.t_rprntc != 0377)
+               ttyecho(tlun.t_rprntc, tp);
+       (void) ttyoutput('\n', tp);
+       s = spl5();
+       for (cp = tp->t_canq.c_cf; cp; cp = nextc(&tp->t_canq, cp))
+               ttyecho(*cp, tp);
+       for (cp = tp->t_rawq.c_cf; cp; cp = nextc(&tp->t_rawq, cp))
+               ttyecho(*cp, tp);
+       tp->t_lstate &= ~LSERASE;
+       splx(s);
+       tp->t_rocount = tp->t_rawq.c_cc;
+       tp->t_rocol = 0;
+}
+
+/*
+ * Echo a typed character to the terminal
+ */
+ttyecho(c, tp)
+register c;
+register struct tty *tp;
+{
+
+       if ((tp->t_lstate & LSCNTTB) == 0)
+               tp->t_local &= ~LFLUSHO;
+       if ((tp->t_flags&ECHO) == 0)
+               return;
+       c &= 0377;
+       if (tp->t_flags&RAW) {
+               (void) ttyoutput(c, tp);
+               return;
+       }
+       if (c == '\r' && tp->t_flags&CRMOD)
+               c = '\n';
+       if (tp->t_local&LCTLECH) {
+               if ((c&0177) <= 037 && c!='\t' && c!='\n' || (c&0177)==0177) {
+                       (void) ttyoutput('^', tp);
+                       c &= 0177;
+                       if (c == 0177)
+                               c = '?';
+                       else if (tp->t_flags&LCASE)
+                               c += 'a' - 1;
+                       else
+                               c += 'A' - 1;
+               }
+       }
+       if ((tp->t_flags&LCASE) && (c >= 'A' && c <= 'Z'))
+               c += 'a' - 'A';
+       (void) ttyoutput(c & 0177, tp);
+}
+
+/*
+ * Is c a break char for tp?
+ */
+ttbreakc(c, tp)
+register c;
+register struct tty *tp;
+{
+       return (c == '\n' || c == tun.t_eofc || c == tun.t_brkc ||
+               c == '\r' && (tp->t_flags&CRMOD));
+}
+
+/*
+ * send string cp to tp
+ */
+ttyout(cp, tp)
+register char *cp;
+register struct tty *tp;
+{
+       register char c;
+
+       while (c = *cp++)
+               (void) ttyoutput(c, tp);
+}
+
+ttwakeup(tp)
+       struct tty *tp;
+{
+
+       if (tp->t_rsel) {
+               selwakeup(tp->t_rsel, tp->t_state&TS_RCOLL);
+               tp->t_state &= ~TS_RCOLL;
+               tp->t_rsel = 0;
+       }
+       wakeup((caddr_t)&tp->t_rawq);
+}
+
+ttsignal(tp, signo)
+       struct tty *tp;
+       int signo;
+{
+
+       gsignal(tp->t_pgrp, signo);
 }
 }
Continuous source code history from original PDP-7 UNIX to FreeBSD 2, the first fully unencumbered FreeBSD release.