SRI-NOSC/dmr/tty.c
#
/* Revision - New handshake handler */
/*
* general TTY subroutines
*/
#include "param.h"
#include "systm.h"
#include "user.h"
/*#include "userx.h"*/
#include "tty.h"
#include "proc.h"
/*#include "procx.h"*/
#include "inode.h"
/*#include "inodex.h"*/
#include "file.h"
/*#include "filex.h"*/
#include "reg.h"
#include "conf.h"
#define DLDELAY 4
/*
* The actual structure of a clist block manipulated by
* getc and putc (mch.s)
*/
struct cblock {
struct cblock *c_next;
char info[6];
};
/* Structure to select one char out of queue */
struct {
char q_char;
};
/* The character lists-- space for 6*NCLIST characters */
struct cblock cfree[NCLIST];
/* List head for unused character blocks. */
struct cblock *cfreelist;
/*
* structure of device registers for KL, DL, and DC
* interfaces-- more particularly, those for which the
* SSTART bit is off and can be treated by general routines
* (that is, not DH).
*/
struct {
int ttrcsr;
int ttrbuf;
int tttcsr;
int tttbuf;
};
/*
* routine called on first teletype open.
* establishes a process group for distribution
* of quits and interrupts from the tty.
*/
ttyopen(dev, atp)
struct tty *atp;
{
register struct proc *pp;
register struct tty *tp;
pp = u.u_procp;
tp = atp;
if(pp->p_pgrp == 0) {
pp->p_pgrp = pp->p_pid;
u.u_ttyp = tp;
u.u_ttyd = dev;
tp->t_pgrp = pp->p_pid;
}
if ((tp->t_state & ISOPEN) == 0)
{
tp->t_erase = CERASE;
tp->t_kill = CKILL;
tp->t_quit = CQUIT;
tp->t_intr = CINTR;
tp->t_EOT = CEOT;
tp->t_asize = TTACK;
tp->t_enq = CENQ;
tp->t_ack = CACK;
tp->t_esc = CESC;
tp->t_cntla = CSPEC;
tp->t_freeze = CFREEZE;
tp->t_thaw = CTHAW;
tp->t_hold = CHOLD;
tp->t_release = CREL;
tp->t_retype = CRETYPE;
tp->t_clear = CCLEAR;
tp->t_silent = CSILENT;
tp->t_atime = 60;
tp->t_alwat = (tp->t_asize&0377) >> 1;
}
tp->t_state =& ~WOPEN;
tp->t_state =| ISOPEN;
}
/*
* The routine implementing the gtty system call.
* Just call lower level routine and pass back values.
*/
gtty()
{
int v[3];
register *up, *vp;
vp = v;
sgtty(vp);
if (u.u_error)
return;
up = u.u_arg[0];
suword(up, *vp++);
suword(++up, *vp++);
suword(++up, *vp++);
}
/*
* The routine implementing the stty system call.
* Read in values and call lower level.
*/
stty()
{
register int *up;
up = u.u_arg[0];
u.u_arg[0] = fuword(up);
u.u_arg[1] = fuword(++up);
u.u_arg[2] = fuword(++up);
sgtty(0);
}
/*
* Stuff common to stty and gtty.
* Check legality and switch out to individual
* device routine.
* v is 0 for stty; the parameters are taken from u.u_arg[].
* c is non-zero for gtty and is the place in which the device
* routines place their information.
*/
sgtty(v)
int *v;
{
register struct file *fp;
register struct inode *ip;
if ((fp = getf(u.u_ar0[R0])) == NULL)
return;
ip = fp->f_inode;
if ((ip->i_mode&IFMT) != IFCHR) {
u.u_error = ENOTTY;
return;
}
(*cdevsw[ip->i_addr[0].d_major].d_sgtty)(ip->i_addr[0], v);
}
/*
* Wait for output to drain, then flush input waiting.
*/
wflushtty(atp)
struct tty *atp;
{
register struct tty *tp;
tp = atp;
spl5();
while (tp->t_outq.c_cc) {
tp->t_state =| ASLEEP;
sleep(&tp->t_outq, TTOPRI);
}
flushtty(tp);
spl0();
}
/*
* Initialize clist by freeing all character blocks, then count
* number of character devices. (Once-only routine)
*/
cinit()
{
register int ccp;
register struct cblock *cp;
register struct cdevsw *cdp;
ccp = cfree;
for (cp=(ccp+07)&~07; cp <= &cfree[NCLIST-1]; cp++) {
cp->c_next = cfreelist;
cfreelist = cp;
}
ccp = 0;
for(cdp = cdevsw; cdp->d_open; cdp++)
ccp++;
nchrdev = ccp;
}
/*
* flush all TTY queues
*/
flushtty(atp)
struct tty *atp;
{
register struct tty *tp;
register int sps;
sps = PS->integ;
spl5();
tp = atp;
while (getc(&tp->t_canq) >= 0);
while (getc(&tp->t_outq) >= 0);
wakeup(&tp->t_canq);
wakeup(&tp->t_outq);
PS->integ = sps;
}
/*
* Place a character on can TTY input queue, putting in delimiters
* and waking up top half as needed.
* Also echo if required.
* The arguments are the character and the appropriate
* tty structure.
*/
/* Echo places a character on the appropriate tty's output queue, and starts
* it up. Also, some processing to output certain control characters is done */
echo(ac,atp)
register struct tty *atp;
{
if (ac < 0 || ((atp->t_flags & ECHO) == 0)) return;
if (ac <= 037 && (ac < 07 || ac > 012))
{
echo ('^',atp);
ac =+ 0100;
}
ttyoutput(ac,atp);
ttstart(atp);
}
echostr(s,tp)
register char *s;
register struct tty *tp;
{
if ((tp->t_flags & ECHO) == 0) return;
while(*s) putc(*s++,&tp->t_outq);
ttstart(tp);
}
ttcursor(x,y,tp)
register struct tty *tp;
{
if ((tp->t_flags & ECHO) == 0) return;
echostr("\033Y",tp); /* escape sequence */
putc(x+040,&tp->t_outq); /* row */
putc(y+040,&tp->t_outq); /* col */
putc(0201,&tp->t_outq); /* vt52 delay */
ttstart(tp);
tp->t_col = y;
}
ttretype(tp)
register struct tty *tp;
{
register cptr;
cptr = tp->t_llf; /* start from end of last line */
/* if ((cptr = tp->t_llf) == 0)
cptr = tp->t_canq.c_cf; */
if (tp->t_canq.c_cc)
while (cptr != tp->t_canq.c_cl) {
if ((cptr & 07) == 0)
if ( (cptr = &((cptr - 010)->c_next->info[0]))
== tp->t_canq.c_cl )
break;
echo(cptr->q_char,tp);
cptr++;
}
}
char *tterase "\b \b";
char *ttclear "\033H\033J";
char *ttforw "\033C";
char *ttkill "\033K";
ttyinput(ac,atp)
struct tty *atp;
{
register int t_flags, c;
register struct tty *tp;
int cptr;
int cano; /* type of terminal */
/* tk_nin =+ 1;*/
tp = atp; c=ac&0377; t_flags = tp->t_flags; /* Load registers */
if ((tp->t_flag2 & LITIN) == 0) c =& 0177;
if (tp->t_flag2 & (RACK | WACK))
{ if ((tp->t_flag2 & WACK) && (c == (tp->t_ack & 0377)))
{
tp->t_acnt = tp->t_asize;
wakeup(&tp->t_acnt);
return;
}
if ((tp->t_flag2 & RACK) && (c == (tp->t_enq & 0377)))
{
if ((tp->t_canq.c_cc <= tp->t_alwat) || /* ack if possible */
(tp->t_llf == tp->t_canq.c_cf))
{
putc(tp->t_ack,&tp->t_outq);
ttstart(tp);
}
else
tp->t_state =| ENQRCV;
return;
}
if (tp->t_state & ESCRCV)
{
tp->t_state =& ~ESCRCV;
switch(c)
{
case CESC1: c = tp->t_enq; break;
case CESC2: c = tp->t_ack; break;
}
}
else if (c == (tp->t_esc & 0377))
{
tp->t_state =| ESCRCV;
return;
}
}
if ((tp->t_flag2 & WHOLD) && !(tp->t_state & HELD)
&& (tp->t_canq.c_cc >= tp->t_asize))
{ /* send a HOLD character */
tp->t_state =| HELD;
putc(tp->t_hold, &tp->t_outq);
ttstart(tp);
}
if (tp->t_flag2 & LITIN) /* Literal input */
{
if (tp->t_canq.c_cc >= TTYHOG) return;
putc(c,&tp->t_canq);
tp->t_llf = tp->t_canq.c_cl; /* set llf */
wakeup(&tp->t_canq); /* wake up!! */
return;
}
if (t_flags & CRMOD)
if (c == '\r') c = '\n';
else if (c == '\n') c = '\r';
if (((c==tp->t_intr) || (c==tp->t_quit) || (c==tp->t_cntla))
&& ((tp->t_flag2 & EEI) || ((t_flags & RAW) == 0)))
{
if (c == tp->t_intr)
signal (tp->t_pgrp,SIGINT);
else
signal (tp->t_pgrp, c==tp->t_quit?SIGQIT:SIGSPC);
flushtty (tp);
tp->t_state =& ~FROZEN; /* signals thaw tty */
echo(c,tp);
echo('\n',tp);
return;
}
if (tp->t_canq.c_cc >= TTYHOG) {
if (t_flags & RAW) return;
if ((c != tp->t_erase) && (c != tp->t_kill)) return;
}
switch(tp->t_cano) {
case TC_GT40:
case TC_TERM:
case TC_VT52:
cano = 1;
break;
default:
cano = 0;
break;
}
if (t_flags & LCASE && c >= 'A' && c <= 'Z') /* Convert to lower case if necessary */
c =+ 'a' - 'A' ;
if (t_flags & RAW)
{
putc(c,&tp->t_canq);
}
else if (c == tp->t_erase)
{
c = -1;
if ((tp->t_llf != tp->t_canq.c_cl ) &&
((c = unputc(&tp->t_canq)) >= 0))
if (cano) { /* special terminals */
switch (partab[c] & 077) {
case 1: /* non - printing */
if (c <= 012 && c >= 07) break;
case 5:
case 6:
echostr(tterase,tp);
tp->t_col--;
case 0: /* normal */
echostr(tterase,tp);
tp->t_col--;
break;
case 2:
echostr(ttforw,tp);
tp->t_col++;
break;
case 4:
ttcursor(0136,tp->t_delpos,tp);
ttretype(tp);
break;
}
c = -1;
/* normal printing terminal delete */
} else
if ((tp->t_state & ERMODE) == 0)
{
echo('\\',tp);
tp->t_state =| ERMODE;
}
}
else
{
if (tp->t_state & ERMODE) /* If in erase mode, */
{
echo('\\',tp); /* echo '\' to indicate out of erase mode */
tp->t_state =& ~ERMODE; /* and turn it off */
}
if (c == tp->t_retype)
{
if (cano) ttcursor(0136,tp->t_delpos,tp);
else {
echo(c,tp);
echo('\n',tp);
}
ttretype(tp);
c = -1;
}
else if (c == tp->t_kill)
{
if (cano) {
ttcursor(0136,tp->t_delpos,tp);
echostr(ttkill,tp);
} else {
echo (c,atp);
echo('\n',tp);
}
while ((tp->t_llf != tp->t_canq.c_cl) &&
(unputc(&tp->t_canq) > 0)) ; /* flush till empty or end-of-line */
c = -1;
}
else if (c == tp->t_EOT) /* End of file indicator */
{
putc(c,&tp->t_canq);
c = -2;
}
else if (c == tp->t_silent)
{
flushtty(tp);
echo (c,tp); echo ('\n',tp); echo ('\n',tp);
if (tp->t_flag2 & SILENT)
tp->t_flag2 =& ~SILENT;
else tp->t_flag2 =| SILENT;
}
else if (c == tp->t_clear)
{
if (cano) echostr(ttclear,tp);
else {
echo(c,tp);
echo('\n',tp);
}
ttretype(tp);
tp->t_delpos = 0;
c = -1;
}
else if (c == tp->t_freeze)
{ tp->t_state =| FROZEN; /* freeze the screen */
return;
}
else if (c == tp->t_thaw)
{ tp->t_state =& ~FROZEN; /* wakeup output */
wakeup(&tp->t_outq);
return;
}
else
putc(c,&tp->t_canq); /* Anything else goes straight to can queue */
}
echo(c,tp); /* Echo the character */
if (tp->t_canq.c_cc == 1 || (tp->t_llf&07) == 0)
tp->t_llf = tp->t_canq.c_cf; /* Initialize t_llf */
if (t_flags & RAW || c == '\n' || c == -2) /* If line delimiter, wake up canan() */
{
tp->t_delpos = 0; /* for kill processing */
tp->t_llf = tp->t_canq.c_cl;
wakeup(&tp->t_canq);
}
return; /* (Implied return anyway) */
}
/*
* put character on TTY output queue, adding delays,
* expanding tabs, and handling the CR/NL bit.
* 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.
*/
ttyoutput(ac, tp)
struct tty *tp;
{
register int c;
register struct tty *rtp;
register char *colp;
int ctype,sps;
/* tk_nout =+ 1;*/
rtp = tp;
c = ac;
if (rtp->t_flag2 & SILENT) return(0);
if ((rtp->t_flag2 & (RACK | WACK))
&& ((c == tp->t_enq) || (c == tp->t_ack) ||
(c == tp->t_esc)))
{
if (putc(rtp->t_esc,&rtp->t_outq)) return(1);
if (c == rtp->t_enq) c = CESC1;
else if (c == rtp->t_ack) c = CESC2;
}
if (rtp->t_flag2 & LITOUT) /* Literal output */
{
if (putc(c, &rtp->t_outq))
return(1);
else
{
if (rtp->t_acnt) rtp->t_acnt--;
return(0);
}
}
c =& 0177;
/*
* Ignore EOT in normal mode to avoid hanging up
* certain terminals.
*/
if (c==004 && (rtp->t_flags&(RAW|WACK|RACK))==0)
return(0);
/*
* Turn tabs to spaces as required
*/
if (c=='\t' && rtp->t_flags&XTABS) {
do
if (ttyoutput(' ', rtp)) return(1);
while (rtp->t_col&07);
return(0);
}
/*
* for upper-case-only terminals,
* generate escapes.
*/
if (rtp->t_flags&LCASE) {
colp = "({)}!|^~'`";
while(*colp++)
if(c == *colp++) {
if (ttyoutput('\\', rtp)) return(1);
c = colp[-2];
break;
}
if ('a'<=c && c<='z')
c =+ 'A' - 'a';
}
/*
* turn <nl> to <cr><lf> if desired.
*/
if (c=='\n' && rtp->t_flags&CRMOD) /* added CRMOD test - KLH 6/19/79 */
if (ttyoutput('\r', rtp)) return(1);
if (putc(c, &rtp->t_outq)) return(1); /* put char in buffer */
if (rtp->t_acnt) rtp->t_acnt--;
/*
* Calculate delays.
* The numbers here represent clock ticks
* and are not necessarily optimal for all terminals.
* The delays are indicated by characters above 0200,
* thus (unfortunately) restricting the transmission
* path to 7 bits.
*/
colp = &rtp->t_col;
ctype = partab[c];
c = 0;
switch (ctype&077) {
/* ordinary */
case 0:
(*colp)++;
/* non-printing */
case 1:
break;
/* backspace */
case 2:
if (*colp)
(*colp)--;
break;
/* newline */
case 3:
ctype = (rtp->t_flags >> 8) & 03;
if(ctype == 1) { /* tty 37 */
if (*colp)
c = max((*colp>>4) + 3, 6);
} else
if(ctype == 2) { /* vt05 */
c = 6;
}
*colp = 0;
break;
/* tab */
case 4:
ctype = (rtp->t_flags >> 10) & 03;
if(ctype == 1) { /* tty 37 */
c = 1 - (*colp | ~07);
if(c < 5)
c = 0;
}
*colp =| 07;
(*colp)++;
break;
/* vertical motion */
case 5:
if(rtp->t_flags & VTDELAY) /* tty 37 */
c = 0177;
break;
/* carriage return */
case 6:
ctype = (rtp->t_flags >> 12) & 03;
if(ctype == 1) { /* tn 300 */
c = 5;
} else
if(ctype == 2) { /* ti 700 */
c = 10;
}
*colp = 0;
}
if(c) putc(c|0200, &rtp->t_outq); /* put in delay unless zero */
return(0); /* we always return 0 here because if inserting
the delay char fails, we can just ignore. */
}
/*
* 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(atp)
{
register struct tty *tp;
tp = atp;
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.
* If the SSTART bit is off for the tty the work is done here,
* using the protocol of the single-line interfaces (KL, DL, DC);
* otherwise the address word of the tty structure is
* taken to be the name of the device-dependent startup routine.
*/
ttstart(atp)
struct tty *atp;
{
register int *addr, c;
int sps;
register struct tty *tp;
struct { int (*func)(); };
tp = atp;
addr = tp->t_addr;
if (tp->t_state&SSTART) {
(*addr.func)(tp);
return;
}
sps = PS->integ;
spl5();
if ((addr->tttcsr&DONE)==0 || tp->t_state&TIMEOUT)
return;
if ((c=getc(&tp->t_outq)) >= 0) {
if (tp->t_flag2 & LITOUT) /* Literal output */
addr->tttbuf = c;
else if (c<=0177)
addr->tttbuf = c | (partab[c]&0200);
else {
timeout(ttrstrt, tp, (c&0177) + DLDELAY);
tp->t_state =| TIMEOUT;
}
}
PS->integ = sps;
}
/*
* Called from device's read routine after it has
* calculated the tty-structure given as argument.
* The pc is backed up for the duration of this call.
* In case of a caught interrupt, an RTI will re-execute.
*/
ttread(atp)
struct tty *atp;
{
register struct tty *tp;
register int c;
tp = atp;
tp->t_flag2 =& ~SILENT;
spl5();
while ((tp->t_canq.c_cc == 0) || (tp->t_llf == tp->t_canq.c_cf))
{
if ((tp->t_state & CARR_ON) == 0)
return;
sleep(&tp->t_canq,TTIPRI);
}
spl0();
while ((tp->t_canq.c_cf) && (tp->t_llf != tp->t_canq.c_cf))
{
c = getc (&tp->t_canq);
if (tp->t_canq.c_cc <= tp->t_alwat)
{
if ((tp->t_flag2 & RACK) && (tp->t_state & ENQRCV))
{
tp->t_state =& ~ENQRCV;
while (putc(tp->t_ack, &tp->t_outq)) sleep(&lbolt,22);
ttstart(tp);
}
if ((tp->t_flag2 & WHOLD) && (tp->t_state & HELD))
{
tp ->t_state =& ~HELD;
while (putc(tp->t_release, &tp->t_outq)) sleep(&lbolt,22);
ttstart(tp);
}
}
if (tp->t_flags & RAW)
{
/* Changed 6/19/79 KLH to permit
reading more than one char in
raw mode. */
if(passc(c) < 0) break;
else continue;
/* passc(c); */
/* break; */
}
if ((c == tp->t_EOT) || passc(c) < 0 || c == '\n')
break;
}
}
/*
* wakes up process waiting for an acknowledge if the
* ACKWAIT bit in t_state is still set.
*/
ttywakeup(atp)
register struct tty *atp;
{
if (atp->t_state & ACKWAIT)
{
atp->t_state =& ~ACKWAIT;
wakeup(&atp->t_acnt);
}
}
/*
* Called from the device's write routine after it has
* calculated the tty-structure given as argument.
*/
ttwrite(atp)
struct tty *atp;
{
register struct tty *tp;
register int c;
tp = atp;
if ((tp->t_state&CARR_ON)==0)
return;
while ((c=cpass())>=0) {
spl5();
while(tp->t_state & FROZEN)
sleep(&tp->t_outq, TTOPRI); /* wait for thaw */
while (tp->t_outq.c_cc > TTHIWAT) {
ttstart(tp);
tp->t_state =| ASLEEP;
sleep(&tp->t_outq, TTOPRI);
}
while((tp->t_flag2 & WACK) && (tp->t_acnt == 0))
{
while (putc(tp->t_enq, &tp->t_outq)) sleep(&lbolt,22);
ttstart(tp);
if ((tp->t_state & ACKWAIT) == 0)
{
timeout(ttywakeup,tp,tp->t_atime);
tp->t_state =| ACKWAIT;
}
sleep(&tp->t_acnt,TTOPRI);
}
spl0();
while (ttyoutput(c, tp)) sleep(&lbolt, 21);
}
tp->t_delpos = tp->t_col;
ttstart(tp);
}
/*
* Common code for gtty and stty functions on typewriters.
* If v is non-zero then gtty is being done and information is
* passed back therein;
* if it is zero stty is being done and the input information is in the
* u_arg array.
*/
ttystty(atp, av)
int *atp, *av;
{
register *tp, *v;
tp = atp;
if(v = av) {
*v++ = tp->t_speeds;
v->lobyte = tp->t_erase;
v->hibyte = tp->t_kill;
v[1] = tp->t_flags;
return(1);
}
wflushtty(tp);
v = u.u_arg;
tp->t_speeds = *v++;
tp->t_erase = v->lobyte;
tp->t_kill = v->hibyte;
tp->t_flags = v[1];
return(0);
}
/* common code for ttymode handlers */
ttmode(atp,acp)
int *acp;
char atp[];
/* Rather than considering atp as a pointer to a tty structure, it is treated
* as an array of bytes, so that the individual bytes can be referenced as an
* offset from the base, rather than being individually selected via ->.
*/
{
register bn,bits;
register int *cp;
cp = acp;
bits = (*cp) & TBITS; /* extract argument bits
*/
if ((bn = (((*cp)&TBYTNUM)>>8)) > TMAXBN) /* extract byte number, and check for validity */
{
u.u_error = EINVAL; /* invalid argument */
return(1);
}
if ((*cp) & TFLUSH) wflushtty(atp); /* request to flush buffer first*/
*cp = ((*cp) & 0177400) + (atp[TFIXOFS+bn] & 0377); /* current value placed in *cp */
switch((*cp) & TCNTL) /* control bits */
{
case TCLEAR: /* bit clear */
atp[TFIXOFS + bn] =& ~bits;
break;
case TSET: /* bit set */
atp[TFIXOFS + bn] =| bits;
break;
case TREPLAC:
atp[TFIXOFS + bn] = bits; /* replace */
case TGET: ; /* just get it. (done anyway) */
}
if (((*cp)&TCNTL != TGET) && (bn<6)) /* if speeds or mode changed, return 0. (for dhttymd) */
return(0);
return(1);
}