xref: /csrg-svn/sys/kern/tty.c (revision 42141)
123387Smckusick /*
240712Skarels  * Copyright (c) 1982, 1986, 1990 Regents of the University of California.
323387Smckusick  * All rights reserved.  The Berkeley software License Agreement
423387Smckusick  * specifies the terms and conditions for redistribution.
523387Smckusick  *
6*42141Smckusick  *	@(#)tty.c	7.25 (Berkeley) 05/16/90
723387Smckusick  */
839Sbill 
917095Sbloom #include "param.h"
1017095Sbloom #include "systm.h"
1117095Sbloom #include "user.h"
1217095Sbloom #include "ioctl.h"
1339407Smarc #define TTYDEFCHARS
1417095Sbloom #include "tty.h"
1535811Smarc #undef TTYDEFCHARS
1617095Sbloom #include "proc.h"
1717095Sbloom #include "file.h"
1817095Sbloom #include "conf.h"
1929946Skarels #include "dkstat.h"
2017095Sbloom #include "uio.h"
2117095Sbloom #include "kernel.h"
2237728Smckusick #include "vnode.h"
2335811Smarc #include "syslog.h"
2439Sbill 
2537525Smckusick #include "machine/reg.h"
2637525Smckusick 
2740712Skarels /* symbolic sleep message strings */
2840712Skarels char ttyin[] = "ttyin";
2940712Skarels char ttyout[] = "ttyout";
3041370Smarc char ttopen[] = "ttyopn";
3141370Smarc char ttclos[] = "ttycls";
3240712Skarels char ttybg[] = "ttybg";
3340712Skarels char ttybuf[] = "ttybuf";
3440712Skarels 
357436Skre /*
367436Skre  * Table giving parity for characters and indicating
3735811Smarc  * character classes to tty driver. The 8th bit
3835811Smarc  * indicates parity, the 7th bit indicates the character
3935811Smarc  * is an alphameric or underscore (for ALTWERASE), and the
4035811Smarc  * low 6 bits indicate delay type.  If the low 6 bits are 0
4135811Smarc  * then the character needs no special processing on output.
427436Skre  */
4339Sbill 
447436Skre char partab[] = {
4535811Smarc 	0001,0201,0201,0001,0201,0001,0001,0201,	/* nul - bel */
4635811Smarc 	0202,0004,0003,0201,0005,0206,0201,0001,	/* bs - si */
4735811Smarc 	0201,0001,0001,0201,0001,0201,0201,0001,	/* dle - etb */
4835811Smarc 	0001,0201,0201,0001,0201,0001,0001,0201,	/* can - us */
4935811Smarc 	0200,0000,0000,0200,0000,0200,0200,0000,	/* sp - ' */
5035811Smarc 	0000,0200,0200,0000,0200,0000,0000,0200,	/* ( - / */
5135811Smarc 	0100,0300,0300,0100,0300,0100,0100,0300,	/* 0 - 7 */
5235811Smarc 	0300,0100,0000,0200,0000,0200,0200,0000,	/* 8 - ? */
5335811Smarc 	0200,0100,0100,0300,0100,0300,0300,0100,	/* @ - G */
5435811Smarc 	0100,0300,0300,0100,0300,0100,0100,0300,	/* H - O */
5535811Smarc 	0100,0300,0300,0100,0300,0100,0100,0300,	/* P - W */
5635811Smarc 	0300,0100,0100,0200,0000,0200,0200,0300,	/* X - _ */
5735811Smarc 	0000,0300,0300,0100,0300,0100,0100,0300,	/* ` - g */
5835811Smarc 	0300,0100,0100,0300,0100,0300,0300,0100,	/* h - o */
5935811Smarc 	0300,0100,0100,0300,0100,0300,0300,0100,	/* p - w */
6035811Smarc 	0100,0300,0300,0000,0200,0000,0000,0201,	/* x - del */
617436Skre 	/*
6235811Smarc 	 * meta chars
637436Skre 	 */
6435811Smarc 	0001,0201,0201,0001,0201,0001,0001,0201,	/* nul - bel */
6535811Smarc 	0202,0004,0003,0201,0005,0206,0201,0001,	/* bs - si */
6635811Smarc 	0201,0001,0001,0201,0001,0201,0201,0001,	/* dle - etb */
6735811Smarc 	0001,0201,0201,0001,0201,0001,0001,0201,	/* can - us */
6835811Smarc 	0200,0000,0000,0200,0000,0200,0200,0000,	/* sp - ' */
6935811Smarc 	0000,0200,0200,0000,0200,0000,0000,0200,	/* ( - / */
7035811Smarc 	0100,0300,0300,0100,0300,0100,0100,0300,	/* 0 - 7 */
7135811Smarc 	0300,0100,0000,0200,0000,0200,0200,0000,	/* 8 - ? */
7235811Smarc 	0200,0100,0100,0300,0100,0300,0300,0100,	/* @ - G */
7335811Smarc 	0100,0300,0300,0100,0300,0100,0100,0300,	/* H - O */
7435811Smarc 	0100,0300,0300,0100,0300,0100,0100,0300,	/* P - W */
7535811Smarc 	0300,0100,0100,0200,0000,0200,0200,0300,	/* X - _ */
7635811Smarc 	0000,0300,0300,0100,0300,0100,0100,0300,	/* ` - g */
7735811Smarc 	0300,0100,0100,0300,0100,0300,0300,0100,	/* h - o */
7835811Smarc 	0300,0100,0100,0300,0100,0300,0300,0100,	/* p - w */
7935811Smarc 	0100,0300,0300,0000,0200,0000,0000,0201,	/* x - del */
807436Skre };
817436Skre 
8235811Smarc extern struct tty *constty;		/* temporary virtual console */
8335811Smarc extern char partab[], maptab[];
8435811Smarc 
85146Sbill /*
8635811Smarc  * Is 'c' a line delimiter ("break" character)?
8739Sbill  */
8840712Skarels #define ttbreakc(c) ((c) == '\n' || ((c) == cc[VEOF] || \
8940712Skarels 	(c) == cc[VEOL] || (c) == cc[VEOL2]) && (c) != _POSIX_VDISABLE)
9039Sbill 
9139Sbill ttychars(tp)
929578Ssam 	struct tty *tp;
9339Sbill {
9435811Smarc 	bcopy(ttydefchars, tp->t_cc, sizeof(ttydefchars));
9539Sbill }
9639Sbill 
9739Sbill /*
98903Sbill  * Wait for output to drain, then flush input waiting.
9939Sbill  */
10012752Ssam ttywflush(tp)
10137584Smarc 	struct tty *tp;
10239Sbill {
10340712Skarels 	int error;
10439Sbill 
10540712Skarels 	if ((error = ttywait(tp)) == 0)
10640712Skarels 		ttyflush(tp, FREAD);
10740712Skarels 	return (error);
10812752Ssam }
10912752Ssam 
11035811Smarc /*
11135811Smarc  * Wait for output to drain.
11235811Smarc  */
11312752Ssam ttywait(tp)
11412752Ssam 	register struct tty *tp;
11512752Ssam {
11640712Skarels 	int error = 0, s = spltty();
11712752Ssam 
11813809Ssam 	while ((tp->t_outq.c_cc || tp->t_state&TS_BUSY) &&
11937584Smarc 	    (tp->t_state&TS_CARR_ON || tp->t_cflag&CLOCAL) &&
12037584Smarc 	    tp->t_oproc) {
121903Sbill 		(*tp->t_oproc)(tp);
1225408Swnj 		tp->t_state |= TS_ASLEEP;
12340712Skarels 		if (error = tsleep((caddr_t)&tp->t_outq, TTOPRI | PCATCH,
12440712Skarels 		    ttyout, 0))
12540712Skarels 			break;
126903Sbill 	}
1279859Ssam 	splx(s);
12840712Skarels 	return (error);
12939Sbill }
13039Sbill 
13139Sbill /*
1329578Ssam  * Flush all TTY queues
13339Sbill  */
13412752Ssam ttyflush(tp, rw)
1357625Ssam 	register struct tty *tp;
13639Sbill {
137903Sbill 	register s;
138903Sbill 
13917545Skarels 	s = spltty();
140903Sbill 	if (rw & FREAD) {
141903Sbill 		while (getc(&tp->t_canq) >= 0)
142903Sbill 			;
14337584Smarc 		ttwakeup(tp);
144903Sbill 	}
145903Sbill 	if (rw & FWRITE) {
14637584Smarc 		wakeup((caddr_t)&tp->t_outq); /* XXX? what about selwakeup? */
1475408Swnj 		tp->t_state &= ~TS_TTSTOP;
1485426Swnj 		(*cdevsw[major(tp->t_dev)].d_stop)(tp, rw);
149903Sbill 		while (getc(&tp->t_outq) >= 0)
150903Sbill 			;
151903Sbill 	}
152903Sbill 	if (rw & FREAD) {
153903Sbill 		while (getc(&tp->t_rawq) >= 0)
154903Sbill 			;
1559578Ssam 		tp->t_rocount = 0;
156903Sbill 		tp->t_rocol = 0;
1579578Ssam 		tp->t_state &= ~TS_LOCAL;
158903Sbill 	}
159903Sbill 	splx(s);
16039Sbill }
16139Sbill 
162903Sbill /*
163903Sbill  * Send stop character on input overflow.
164903Sbill  */
165903Sbill ttyblock(tp)
1667625Ssam 	register struct tty *tp;
16739Sbill {
168903Sbill 	register x;
1699578Ssam 
170903Sbill 	x = tp->t_rawq.c_cc + tp->t_canq.c_cc;
171903Sbill 	if (tp->t_rawq.c_cc > TTYHOG) {
17212752Ssam 		ttyflush(tp, FREAD|FWRITE);
1735408Swnj 		tp->t_state &= ~TS_TBLOCK;
174903Sbill 	}
17515118Skarels 	/*
17615118Skarels 	 * Block further input iff:
17715118Skarels 	 * Current input > threshold AND input is available to user program
17815118Skarels 	 */
17916055Skarels 	if (x >= TTYHOG/2 &&
18040712Skarels 	    ((tp->t_lflag&ICANON) == 0) || (tp->t_canq.c_cc > 0) &&
18135811Smarc 	    tp->t_cc[VSTOP] != _POSIX_VDISABLE) {
18235811Smarc 		if (putc(tp->t_cc[VSTOP], &tp->t_outq)==0) {
18315118Skarels 			tp->t_state |= TS_TBLOCK;
18415118Skarels 			ttstart(tp);
18515118Skarels 		}
186903Sbill 	}
18739Sbill }
18839Sbill 
18939Sbill /*
190903Sbill  * Restart typewriter output following a delay
191903Sbill  * timeout.
192903Sbill  * The name of the routine is passed to the timeout
193903Sbill  * subroutine and it is called during a clock interrupt.
194121Sbill  */
195903Sbill ttrstrt(tp)
19637584Smarc 	struct tty *tp;
197121Sbill {
198121Sbill 
19940712Skarels #ifdef DIAGNOSTIC
2009578Ssam 	if (tp == 0)
2019578Ssam 		panic("ttrstrt");
20240712Skarels #endif
2035408Swnj 	tp->t_state &= ~TS_TIMEOUT;
204903Sbill 	ttstart(tp);
205121Sbill }
206121Sbill 
207121Sbill /*
208903Sbill  * Start output on the typewriter. It is used from the top half
209903Sbill  * after some characters have been put on the output queue,
210903Sbill  * from the interrupt routine to transmit the next
211903Sbill  * character, and after a timeout has finished.
21239Sbill  */
213903Sbill ttstart(tp)
21437584Smarc 	struct tty *tp;
21539Sbill {
21639Sbill 
21732067Skarels 	if (tp->t_oproc)		/* kludge for pty */
218903Sbill 		(*tp->t_oproc)(tp);
21939Sbill }
22039Sbill 
22139Sbill /*
222903Sbill  * Common code for tty ioctls.
22339Sbill  */
2241780Sbill /*ARGSUSED*/
2257625Ssam ttioctl(tp, com, data, flag)
2267625Ssam 	register struct tty *tp;
2277625Ssam 	caddr_t data;
22839Sbill {
22939Sbill 	extern int nldisp;
23037554Smckusick 	int s, error;
23139Sbill 
232903Sbill 	/*
233903Sbill 	 * If the ioctl involves modification,
23417545Skarels 	 * hang if in the background.
235903Sbill 	 */
2367625Ssam 	switch (com) {
23739Sbill 
23835811Smarc 	case TIOCSETD:
239903Sbill 	case TIOCFLUSH:
24035811Smarc 	/*case TIOCSPGRP:*/
2419325Ssam 	case TIOCSTI:
24217598Sbloom 	case TIOCSWINSZ:
24335811Smarc 	case TIOCSETA:
24435811Smarc 	case TIOCSETAW:
24535811Smarc 	case TIOCSETAF:
24639407Smarc /**** these get removed ****
24735811Smarc 	case TIOCSETAS:
24835811Smarc 	case TIOCSETAWS:
24935811Smarc 	case TIOCSETAFS:
25039407Smarc /***************************/
25140030Smarc #ifdef COMPAT_43
25240030Smarc 	case TIOCSETP:
25340030Smarc 	case TIOCSETN:
25440030Smarc 	case TIOCSETC:
25540030Smarc 	case TIOCSLTC:
25640030Smarc 	case TIOCLBIS:
25740030Smarc 	case TIOCLBIC:
25840030Smarc 	case TIOCLSET:
25940030Smarc 	case OTIOCSETD:
26040030Smarc #endif
26139555Smarc 		while (isbackground(u.u_procp, tp) &&
26235811Smarc 		   u.u_procp->p_pgrp->pg_jobc &&
263903Sbill 		   (u.u_procp->p_flag&SVFORK) == 0 &&
26440712Skarels 		   (u.u_procp->p_sigignore & sigmask(SIGTTOU)) == 0 &&
26540712Skarels 		   (u.u_procp->p_sigmask & sigmask(SIGTTOU)) == 0) {
26635811Smarc 			pgsignal(u.u_procp->p_pgrp, SIGTTOU);
26740712Skarels 			if (error = tsleep((caddr_t)&lbolt, TTOPRI | PCATCH,
26840712Skarels 			    ttybg, 0))
26940712Skarels 				return (error);
270903Sbill 		}
271903Sbill 		break;
272903Sbill 	}
273903Sbill 
2749578Ssam 	/*
2759578Ssam 	 * Process the ioctl.
2769578Ssam 	 */
2777625Ssam 	switch (com) {
278903Sbill 
2798556Sroot 	/* get discipline number */
28039Sbill 	case TIOCGETD:
2817625Ssam 		*(int *)data = tp->t_line;
28239Sbill 		break;
28339Sbill 
2848556Sroot 	/* set line discipline */
2857625Ssam 	case TIOCSETD: {
2867625Ssam 		register int t = *(int *)data;
28735811Smarc 		dev_t dev = tp->t_dev;
2887625Ssam 
28935811Smarc 		if ((unsigned)t >= nldisp)
29010851Ssam 			return (ENXIO);
29125584Skarels 		if (t != tp->t_line) {
29225584Skarels 			s = spltty();
29325584Skarels 			(*linesw[tp->t_line].l_close)(tp);
29425584Skarels 			error = (*linesw[t].l_open)(dev, tp);
29525584Skarels 			if (error) {
29635811Smarc 				(void)(*linesw[tp->t_line].l_open)(dev, tp);
29725584Skarels 				splx(s);
29825584Skarels 				return (error);
29925584Skarels 			}
30025584Skarels 			tp->t_line = t;
30110851Ssam 			splx(s);
30210851Ssam 		}
30339Sbill 		break;
3047625Ssam 	}
30539Sbill 
3068556Sroot 	/* prevent more opens on channel */
3075614Swnj 	case TIOCEXCL:
3085614Swnj 		tp->t_state |= TS_XCLUDE;
3095614Swnj 		break;
3105614Swnj 
3115614Swnj 	case TIOCNXCL:
3125614Swnj 		tp->t_state &= ~TS_XCLUDE;
3135614Swnj 		break;
3145614Swnj 
31539Sbill 	case TIOCHPCL:
31635811Smarc 		tp->t_cflag |= HUPCL;
31739Sbill 		break;
31839Sbill 
3193942Sbugs 	case TIOCFLUSH: {
3207625Ssam 		register int flags = *(int *)data;
3217625Ssam 
3227625Ssam 		if (flags == 0)
3233942Sbugs 			flags = FREAD|FWRITE;
3247625Ssam 		else
3257625Ssam 			flags &= FREAD|FWRITE;
32612752Ssam 		ttyflush(tp, flags);
32739Sbill 		break;
3283944Sbugs 	}
32939Sbill 
33037584Smarc 	case FIOASYNC:
33137584Smarc 		if (*(int *)data)
33237584Smarc 			tp->t_state |= TS_ASYNC;
33337584Smarc 		else
33437584Smarc 			tp->t_state &= ~TS_ASYNC;
33537584Smarc 		break;
33637584Smarc 
33737584Smarc 	case FIONBIO:
33837584Smarc 		break;	/* XXX remove */
33937584Smarc 
3408556Sroot 	/* return number of characters immediately available */
3417625Ssam 	case FIONREAD:
3427625Ssam 		*(off_t *)data = ttnread(tp);
343174Sbill 		break;
344174Sbill 
34513077Ssam 	case TIOCOUTQ:
34613077Ssam 		*(int *)data = tp->t_outq.c_cc;
34713077Ssam 		break;
34813077Ssam 
3498589Sroot 	case TIOCSTOP:
35017545Skarels 		s = spltty();
3519578Ssam 		if ((tp->t_state&TS_TTSTOP) == 0) {
3525573Swnj 			tp->t_state |= TS_TTSTOP;
3535573Swnj 			(*cdevsw[major(tp->t_dev)].d_stop)(tp, 0);
3545573Swnj 		}
3557625Ssam 		splx(s);
3565573Swnj 		break;
3575573Swnj 
3588589Sroot 	case TIOCSTART:
35917545Skarels 		s = spltty();
36035811Smarc 		if ((tp->t_state&TS_TTSTOP) || (tp->t_lflag&FLUSHO)) {
3615573Swnj 			tp->t_state &= ~TS_TTSTOP;
36235811Smarc 			tp->t_lflag &= ~FLUSHO;
3635573Swnj 			ttstart(tp);
3645573Swnj 		}
3657625Ssam 		splx(s);
3665573Swnj 		break;
3675573Swnj 
3689325Ssam 	/*
3699325Ssam 	 * Simulate typing of a character at the terminal.
3709325Ssam 	 */
3719325Ssam 	case TIOCSTI:
37217183Smckusick 		if (u.u_uid && (flag & FREAD) == 0)
37317183Smckusick 			return (EPERM);
37439555Smarc 		if (u.u_uid && !isctty(u.u_procp, tp))
3759325Ssam 			return (EACCES);
3769578Ssam 		(*linesw[tp->t_line].l_rint)(*(char *)data, tp);
3779325Ssam 		break;
3789325Ssam 
37935811Smarc 	case TIOCGETA: {
38035811Smarc 		struct termios *t = (struct termios *)data;
38112752Ssam 
38235811Smarc 		bcopy(&tp->t_termios, t, sizeof(struct termios));
38335811Smarc 		break;
38435811Smarc 	}
38535811Smarc 
38639407Smarc 	/*** THIS ALL GETS REMOVED ***/
38739407Smarc 	case JUNK_TIOCSETAS:
38839407Smarc 	case JUNK_TIOCSETAWS:
38939407Smarc 	case JUNK_TIOCSETAFS:
39039407Smarc 		((struct termios *)data)->c_cflag |= CIGNORE;
39139407Smarc 		switch(com) {
39239407Smarc 		case JUNK_TIOCSETAS:
39339407Smarc 			com = TIOCSETA;
39439407Smarc 			break;
39539407Smarc 		case JUNK_TIOCSETAWS:
39639407Smarc 			com = TIOCSETAW;
39739407Smarc 			break;
39839407Smarc 		case JUNK_TIOCSETAFS:
39939407Smarc 			com = TIOCSETAF;
40039407Smarc 			break;
40139407Smarc 		}
40239407Smarc 	/*******************************/
40339407Smarc 		/*FALLTHROGH*/
40435811Smarc 	case TIOCSETA:
40535811Smarc 	case TIOCSETAW:
40637584Smarc 	case TIOCSETAF: {
40735811Smarc 		register struct termios *t = (struct termios *)data;
40840712Skarels 
40917545Skarels 		s = spltty();
41039407Smarc 		if (com == TIOCSETAW || com == TIOCSETAF) {
41140712Skarels 			if (error = ttywait(tp)) {
41240712Skarels 				splx(s);
41340712Skarels 				return (error);
41440712Skarels 			}
41539407Smarc 			if (com == TIOCSETAF);
41639407Smarc 				ttyflush(tp, FREAD);
41739407Smarc 		}
41840712Skarels 		if ((t->c_cflag&CIGNORE) == 0) {
41935811Smarc 			/*
42035811Smarc 			 * set device hardware
42135811Smarc 			 */
42237584Smarc 			if (tp->t_param && (error = (*tp->t_param)(tp, t))) {
42337584Smarc 				splx(s);
42435811Smarc 				return (error);
42537584Smarc 			} else {
42640712Skarels 				if ((tp->t_state&TS_CARR_ON) == 0 &&
42737584Smarc 				    (tp->t_cflag&CLOCAL) &&
42840712Skarels 				    (t->c_cflag&CLOCAL) == 0) {
42937584Smarc 					tp->t_state &= ~TS_ISOPEN;
43037584Smarc 					tp->t_state |= TS_WOPEN;
43137584Smarc 					ttwakeup(tp);
43237584Smarc 				}
43335811Smarc 				tp->t_cflag = t->c_cflag;
43435811Smarc 				tp->t_ispeed = t->c_ispeed;
43535811Smarc 				tp->t_ospeed = t->c_ospeed;
43634492Skarels 			}
43735811Smarc 			ttsetwater(tp);
43812752Ssam 		}
43939407Smarc 		if (com != TIOCSETAF) {
44035811Smarc 			if ((t->c_lflag&ICANON) != (tp->t_lflag&ICANON))
44135811Smarc 				if (t->c_lflag&ICANON) {
44235811Smarc 					tp->t_lflag |= PENDIN;
44335811Smarc 					ttwakeup(tp);
44435811Smarc 				}
44535811Smarc 				else {
44635811Smarc 					struct clist tq;
44735811Smarc 
44835811Smarc 					catq(&tp->t_rawq, &tp->t_canq);
44935811Smarc 					tq = tp->t_rawq;
45035811Smarc 					tp->t_rawq = tp->t_canq;
45135811Smarc 					tp->t_canq = tq;
45235811Smarc 				}
45312752Ssam 		}
45435811Smarc 		tp->t_iflag = t->c_iflag;
45535811Smarc 		tp->t_oflag = t->c_oflag;
45635811Smarc 		tp->t_lflag = t->c_lflag;
45735811Smarc 		bcopy(t->c_cc, tp->t_cc, sizeof(t->c_cc));
45812752Ssam 		splx(s);
45912752Ssam 		break;
46012752Ssam 	}
46112752Ssam 
46212752Ssam 	/*
46339555Smarc 	 * Set controlling terminal.
46439555Smarc 	 * Session ctty vnode pointer set in vnode layer.
46534492Skarels 	 */
46635811Smarc 	case TIOCSCTTY: {
46735811Smarc 		register struct proc *p = u.u_procp;
46834492Skarels 
46939555Smarc 		if (!SESS_LEADER(p) ||
47039555Smarc 		   (p->p_session->s_ttyvp || tp->t_session) &&
47139555Smarc 		   (tp->t_session != p->p_session))
47239407Smarc 			return (EPERM);
47335811Smarc 		tp->t_session = p->p_session;
47439555Smarc 		tp->t_pgrp = p->p_pgrp;
47539555Smarc 		p->p_session->s_ttyp = tp;
47639555Smarc 		p->p_flag |= SCTTY;
47734492Skarels 		break;
47835811Smarc 	}
47939555Smarc 
48034492Skarels 	/*
48135811Smarc 	 * Set terminal process group.
48217545Skarels 	 */
48318650Sbloom 	case TIOCSPGRP: {
48435811Smarc 		register struct proc *p = u.u_procp;
48535811Smarc 		register struct pgrp *pgrp = pgfind(*(int *)data);
48617545Skarels 
48739555Smarc 		if (!isctty(p, tp))
48839555Smarc 			return (ENOTTY);
48940030Smarc 		else if (pgrp == NULL || pgrp->pg_session != p->p_session)
49039555Smarc 			return (EPERM);
49139555Smarc 		tp->t_pgrp = pgrp;
49212752Ssam 		break;
49318650Sbloom 	}
49412752Ssam 
49512752Ssam 	case TIOCGPGRP:
49639555Smarc 		if (!isctty(u.u_procp, tp))
49739555Smarc 			return (ENOTTY);
49839555Smarc 		*(int *)data = tp->t_pgrp ? tp->t_pgrp->pg_id : 0;
49912752Ssam 		break;
50012752Ssam 
50117598Sbloom 	case TIOCSWINSZ:
50218650Sbloom 		if (bcmp((caddr_t)&tp->t_winsize, data,
50318650Sbloom 		    sizeof (struct winsize))) {
50417598Sbloom 			tp->t_winsize = *(struct winsize *)data;
50539555Smarc 			pgsignal(tp->t_pgrp, SIGWINCH);
50617598Sbloom 		}
50717598Sbloom 		break;
50817598Sbloom 
50917598Sbloom 	case TIOCGWINSZ:
51017598Sbloom 		*(struct winsize *)data = tp->t_winsize;
51117598Sbloom 		break;
51217598Sbloom 
51330534Skarels 	case TIOCCONS:
51430534Skarels 		if (*(int *)data) {
515*42141Smckusick 			if (constty && constty != tp &&
516*42141Smckusick 			    (constty->t_state & (TS_CARR_ON|TS_ISOPEN)) ==
517*42141Smckusick 			    (TS_CARR_ON|TS_ISOPEN))
51830534Skarels 				return (EBUSY);
51930534Skarels #ifndef	UCONSOLE
52037554Smckusick 			if (error = suser(u.u_cred, &u.u_acflag))
52137554Smckusick 				return (error);
52230534Skarels #endif
52330534Skarels 			constty = tp;
52430534Skarels 		} else if (tp == constty)
52533404Skarels 			constty = NULL;
52630534Skarels 		break;
52730534Skarels 
52835811Smarc #ifdef COMPAT_43
52935811Smarc 	case TIOCGETP:
53035811Smarc 	case TIOCSETP:
53135811Smarc 	case TIOCSETN:
53235811Smarc 	case TIOCGETC:
53335811Smarc 	case TIOCSETC:
53435811Smarc 	case TIOCSLTC:
53535811Smarc 	case TIOCGLTC:
53635811Smarc 	case TIOCLBIS:
53735811Smarc 	case TIOCLBIC:
53835811Smarc 	case TIOCLSET:
53935811Smarc 	case TIOCLGET:
54039407Smarc 	case OTIOCGETD:
54139407Smarc 	case OTIOCSETD:
54235811Smarc 		return(ttcompat(tp, com, data, flag));
54335811Smarc #endif
54435811Smarc 
54539Sbill 	default:
5468556Sroot 		return (-1);
54739Sbill 	}
5488556Sroot 	return (0);
54939Sbill }
5504484Swnj 
5514484Swnj ttnread(tp)
5524484Swnj 	struct tty *tp;
5534484Swnj {
5544484Swnj 	int nread = 0;
5554484Swnj 
55635811Smarc 	if (tp->t_lflag & PENDIN)
5574484Swnj 		ttypend(tp);
5584484Swnj 	nread = tp->t_canq.c_cc;
55935811Smarc 	if ((tp->t_lflag & ICANON) == 0)
5604484Swnj 		nread += tp->t_rawq.c_cc;
5614484Swnj 	return (nread);
5624484Swnj }
5634484Swnj 
5645408Swnj ttselect(dev, rw)
5654484Swnj 	dev_t dev;
5665408Swnj 	int rw;
5674484Swnj {
5684484Swnj 	register struct tty *tp = &cdevsw[major(dev)].d_ttys[minor(dev)];
5694484Swnj 	int nread;
57017545Skarels 	int s = spltty();
5714484Swnj 
5725408Swnj 	switch (rw) {
5734484Swnj 
5744484Swnj 	case FREAD:
5754484Swnj 		nread = ttnread(tp);
57637584Smarc 		if (nread > 0 ||
57740712Skarels 		   ((tp->t_cflag&CLOCAL) == 0 && (tp->t_state&TS_CARR_ON) == 0))
5785408Swnj 			goto win;
5794938Swnj 		if (tp->t_rsel && tp->t_rsel->p_wchan == (caddr_t)&selwait)
5805408Swnj 			tp->t_state |= TS_RCOLL;
5814484Swnj 		else
5824484Swnj 			tp->t_rsel = u.u_procp;
5835408Swnj 		break;
5844484Swnj 
5855408Swnj 	case FWRITE:
58635811Smarc 		if (tp->t_outq.c_cc <= tp->t_lowat)
5875408Swnj 			goto win;
5885408Swnj 		if (tp->t_wsel && tp->t_wsel->p_wchan == (caddr_t)&selwait)
5895408Swnj 			tp->t_state |= TS_WCOLL;
5905408Swnj 		else
5915408Swnj 			tp->t_wsel = u.u_procp;
5925408Swnj 		break;
5934484Swnj 	}
5945408Swnj 	splx(s);
5955408Swnj 	return (0);
5965408Swnj win:
5975408Swnj 	splx(s);
5985408Swnj 	return (1);
5994484Swnj }
6007436Skre 
6017502Sroot /*
60225391Skarels  * Initial open of tty, or (re)entry to line discipline.
6037502Sroot  */
6047502Sroot ttyopen(dev, tp)
6057625Ssam 	dev_t dev;
6067625Ssam 	register struct tty *tp;
6077502Sroot {
6087502Sroot 
6097502Sroot 	tp->t_dev = dev;
61035811Smarc 
6117502Sroot 	tp->t_state &= ~TS_WOPEN;
61217545Skarels 	if ((tp->t_state & TS_ISOPEN) == 0) {
61317545Skarels 		tp->t_state |= TS_ISOPEN;
61417598Sbloom 		bzero((caddr_t)&tp->t_winsize, sizeof(tp->t_winsize));
61517545Skarels 	}
6168556Sroot 	return (0);
6177502Sroot }
6187502Sroot 
6197502Sroot /*
62025391Skarels  * "close" a line discipline
62125391Skarels  */
62225391Skarels ttylclose(tp)
62325391Skarels 	register struct tty *tp;
62425391Skarels {
62525391Skarels 
62625391Skarels 	ttywflush(tp);
62725391Skarels }
62825391Skarels 
62925391Skarels /*
6307502Sroot  * clean tp on last close
6317502Sroot  */
6327502Sroot ttyclose(tp)
6337625Ssam 	register struct tty *tp;
6347502Sroot {
63530534Skarels 	if (constty == tp)
63630534Skarels 		constty = NULL;
63725391Skarels 	ttyflush(tp, FREAD|FWRITE);
63839555Smarc 	tp->t_session = NULL;
63939555Smarc 	tp->t_pgrp = NULL;
6407502Sroot 	tp->t_state = 0;
64140712Skarels 	return (0);
6427502Sroot }
6437502Sroot 
6447502Sroot /*
64525391Skarels  * Handle modem control transition on a tty.
64625391Skarels  * Flag indicates new state of carrier.
64725391Skarels  * Returns 0 if the line should be turned off, otherwise 1.
64825391Skarels  */
64925391Skarels ttymodem(tp, flag)
65025391Skarels 	register struct tty *tp;
65125391Skarels {
65225391Skarels 
65335811Smarc 	if ((tp->t_state&TS_WOPEN) == 0 && (tp->t_lflag & MDMBUF)) {
65425391Skarels 		/*
65525391Skarels 		 * MDMBUF: do flow control according to carrier flag
65625391Skarels 		 */
65725391Skarels 		if (flag) {
65825391Skarels 			tp->t_state &= ~TS_TTSTOP;
65925391Skarels 			ttstart(tp);
66025391Skarels 		} else if ((tp->t_state&TS_TTSTOP) == 0) {
66125391Skarels 			tp->t_state |= TS_TTSTOP;
66225391Skarels 			(*cdevsw[major(tp->t_dev)].d_stop)(tp, 0);
66325391Skarels 		}
66425391Skarels 	} else if (flag == 0) {
66525391Skarels 		/*
66625391Skarels 		 * Lost carrier.
66725391Skarels 		 */
66825391Skarels 		tp->t_state &= ~TS_CARR_ON;
66925391Skarels 		if (tp->t_state & TS_ISOPEN) {
67035811Smarc 			if ((tp->t_lflag & NOHANG) == 0) {
67139555Smarc 				pgsignal(tp->t_pgrp, SIGHUP);
67239555Smarc 				pgsignal(tp->t_pgrp, SIGCONT);
67325391Skarels 				ttyflush(tp, FREAD|FWRITE);
67425391Skarels 				return (0);
67525391Skarels 			}
67625391Skarels 		}
67725391Skarels 	} else {
67825391Skarels 		/*
67925391Skarels 		 * Carrier now on.
68025391Skarels 		 */
68125391Skarels 		tp->t_state |= TS_CARR_ON;
68237584Smarc 		ttwakeup(tp);
68325391Skarels 	}
68425391Skarels 	return (1);
68525391Skarels }
68625391Skarels 
68725391Skarels /*
68825404Skarels  * Default modem control routine (for other line disciplines).
68925404Skarels  * Return argument flag, to turn off device on carrier drop.
69025404Skarels  */
69125415Skarels nullmodem(tp, flag)
69225415Skarels 	register struct tty *tp;
69325404Skarels 	int flag;
69425404Skarels {
69525404Skarels 
69625404Skarels 	if (flag)
69725404Skarels 		tp->t_state |= TS_CARR_ON;
69839407Smarc 	else {
69925404Skarels 		tp->t_state &= ~TS_CARR_ON;
70039407Smarc 		if ((tp->t_lflag & NOHANG) == 0)
70139555Smarc 			pgsignal(tp->t_pgrp, SIGHUP);
70239407Smarc 	}
70325404Skarels 	return (flag);
70425404Skarels }
70525404Skarels 
70625404Skarels /*
7077502Sroot  * reinput pending characters after state switch
70817545Skarels  * call at spltty().
7097502Sroot  */
7107502Sroot ttypend(tp)
7117625Ssam 	register struct tty *tp;
7127502Sroot {
7137502Sroot 	struct clist tq;
7147502Sroot 	register c;
7157502Sroot 
71635811Smarc 	tp->t_lflag &= ~PENDIN;
7179578Ssam 	tp->t_state |= TS_TYPEN;
7187502Sroot 	tq = tp->t_rawq;
7197502Sroot 	tp->t_rawq.c_cc = 0;
7207502Sroot 	tp->t_rawq.c_cf = tp->t_rawq.c_cl = 0;
7217502Sroot 	while ((c = getc(&tq)) >= 0)
7227502Sroot 		ttyinput(c, tp);
7239578Ssam 	tp->t_state &= ~TS_TYPEN;
7247502Sroot }
7257502Sroot 
7267502Sroot /*
72735811Smarc  *
7289578Ssam  * Place a character on raw TTY input queue,
7299578Ssam  * putting in delimiters and waking up top
7309578Ssam  * half as needed.  Also echo if required.
7319578Ssam  * The arguments are the character and the
7329578Ssam  * appropriate tty structure.
7337502Sroot  */
7347502Sroot ttyinput(c, tp)
7357625Ssam 	register c;
7367625Ssam 	register struct tty *tp;
7377502Sroot {
73835811Smarc 	register int iflag = tp->t_iflag;
73935811Smarc 	register int lflag = tp->t_lflag;
74035811Smarc 	register u_char *cc = tp->t_cc;
74135811Smarc 	int i, err;
7427502Sroot 
7439578Ssam 	/*
7449578Ssam 	 * If input is pending take it first.
7459578Ssam 	 */
74635811Smarc 	if (lflag&PENDIN)
7477502Sroot 		ttypend(tp);
74835811Smarc 	/*
74935811Smarc 	 * Gather stats.
75035811Smarc 	 */
7517502Sroot 	tk_nin++;
75235811Smarc 	if (lflag&ICANON) {
75335811Smarc 		tk_cancc++;
75435811Smarc 		tp->t_cancc++;
75535811Smarc 	} else {
75635811Smarc 		tk_rawcc++;
75735811Smarc 		tp->t_rawcc++;
75835811Smarc 	}
7599578Ssam 	/*
76035811Smarc 	 * Handle exceptional conditions (break, parity, framing).
7619578Ssam 	 */
76235811Smarc 	if (err = (c&TTY_ERRORMASK)) {
76335811Smarc 		c &= ~TTY_ERRORMASK;
76435811Smarc 		if (err&TTY_FE && !c) {		/* break */
76535811Smarc 			if (iflag&IGNBRK)
76635811Smarc 				goto endcase;
76735811Smarc 			else if (iflag&BRKINT && lflag&ISIG &&
76835811Smarc 				(cc[VINTR] != _POSIX_VDISABLE))
76935811Smarc 				c = cc[VINTR];
77035811Smarc 			else {
77135811Smarc 				c = 0;
77235811Smarc 				if (iflag&PARMRK)
77335811Smarc 					goto parmrk;
77435811Smarc 			}
77535811Smarc 		} else if ((err&TTY_PE && iflag&INPCK) || err&TTY_FE) {
77635811Smarc 			if (iflag&IGNPAR)
77735811Smarc 				goto endcase;
77835811Smarc 			else if (iflag&PARMRK) {
77935811Smarc parmrk:
78035811Smarc 				putc(0377|TTY_QUOTE, &tp->t_rawq);
78135811Smarc 				putc(0|TTY_QUOTE, &tp->t_rawq);
78235811Smarc 				putc(c|TTY_QUOTE, &tp->t_rawq);
78335811Smarc 				goto endcase;
78435811Smarc 			} else
78535811Smarc 				c = 0;
7867502Sroot 		}
7879578Ssam 	}
7889578Ssam 	/*
78935811Smarc 	 * In tandem mode, check high water mark.
7909578Ssam 	 */
79135811Smarc 	if (iflag&IXOFF)
79235811Smarc 		ttyblock(tp);
79335811Smarc 	if ((tp->t_state&TS_TYPEN) == 0 && (iflag&ISTRIP))
7949578Ssam 		c &= 0177;
7959578Ssam 	/*
7969578Ssam 	 * Check for literal nexting very first
7979578Ssam 	 */
7989578Ssam 	if (tp->t_state&TS_LNCH) {
79935811Smarc 		c |= TTY_QUOTE;
8009578Ssam 		tp->t_state &= ~TS_LNCH;
8019578Ssam 	}
8029578Ssam 	/*
8039578Ssam 	 * Scan for special characters.  This code
8049578Ssam 	 * is really just a big case statement with
8059578Ssam 	 * non-constant cases.  The bottom of the
8069578Ssam 	 * case statement is labeled ``endcase'', so goto
8079578Ssam 	 * it after a case match, or similar.
8089578Ssam 	 */
80935811Smarc 	/*
81035811Smarc 	 * Control chars which aren't controlled
81135811Smarc 	 * by ICANON, ISIG, or IXON.
81235811Smarc 	 */
81339407Smarc 	if (lflag&IEXTEN) {
81440712Skarels 		if (CCEQ(cc[VLNEXT], c)) {
81535811Smarc 			if (lflag&ECHO) {
81635811Smarc 				if (lflag&ECHOE)
81740712Skarels 					ttyoutstr("^\b", tp);
81835811Smarc 				else
81935811Smarc 					ttyecho(c, tp);
82035811Smarc 			}
8219578Ssam 			tp->t_state |= TS_LNCH;
8229578Ssam 			goto endcase;
8239578Ssam 		}
82440712Skarels 		if (CCEQ(cc[VFLUSHO], c)) {
82535811Smarc 			if (lflag&FLUSHO)
82635811Smarc 				tp->t_lflag &= ~FLUSHO;
8277502Sroot 			else {
82812752Ssam 				ttyflush(tp, FWRITE);
8297502Sroot 				ttyecho(c, tp);
8309578Ssam 				if (tp->t_rawq.c_cc + tp->t_canq.c_cc)
8317502Sroot 					ttyretype(tp);
83235811Smarc 				tp->t_lflag |= FLUSHO;
8337502Sroot 			}
8349578Ssam 			goto startoutput;
8359578Ssam 		}
83635811Smarc 	}
83735811Smarc 	/*
83835811Smarc 	 * Signals.
83935811Smarc 	 */
84035811Smarc 	if (lflag&ISIG) {
84135811Smarc 		if (CCEQ(cc[VINTR], c) || CCEQ(cc[VQUIT], c)) {
84235811Smarc 			if ((lflag&NOFLSH) == 0)
84335811Smarc 				ttyflush(tp, FREAD|FWRITE);
84435811Smarc 			ttyecho(c, tp);
84539555Smarc 			pgsignal(tp->t_pgrp,
84640712Skarels 			    CCEQ(cc[VINTR], c) ? SIGINT : SIGQUIT);
84735811Smarc 			goto endcase;
84835811Smarc 		}
84940712Skarels 		if (CCEQ(cc[VSUSP], c)) {
85035811Smarc 			if ((lflag&NOFLSH) == 0)
85112752Ssam 				ttyflush(tp, FREAD);
8529578Ssam 			ttyecho(c, tp);
85339555Smarc 			pgsignal(tp->t_pgrp, SIGTSTP);
8549578Ssam 			goto endcase;
8559578Ssam 		}
8569578Ssam 	}
8579578Ssam 	/*
8589578Ssam 	 * Handle start/stop characters.
8599578Ssam 	 */
86035811Smarc 	if (iflag&IXON) {
86140712Skarels 		if (CCEQ(cc[VSTOP], c)) {
86235811Smarc 			if ((tp->t_state&TS_TTSTOP) == 0) {
86335811Smarc 				tp->t_state |= TS_TTSTOP;
86435811Smarc 				(*cdevsw[major(tp->t_dev)].d_stop)(tp, 0);
86535811Smarc 				return;
86635811Smarc 			}
86735811Smarc 			if (!CCEQ(cc[VSTART], c))
86835811Smarc 				return;
86935811Smarc 			/*
87035811Smarc 			 * if VSTART == VSTOP then toggle
87135811Smarc 			 */
87235811Smarc 			goto endcase;
8739578Ssam 		}
87435811Smarc 		if (CCEQ(cc[VSTART], c))
87535811Smarc 			goto restartoutput;
8769578Ssam 	}
8779578Ssam 	/*
87835811Smarc 	 * IGNCR, ICRNL, & INLCR
8799578Ssam 	 */
88035811Smarc 	if (c == '\r') {
88135811Smarc 		if (iflag&IGNCR)
88235811Smarc 			goto endcase;
88335811Smarc 		else if (iflag&ICRNL)
88435811Smarc 			c = '\n';
8859578Ssam 	}
88635811Smarc 	else if (c == '\n' && iflag&INLCR)
88735811Smarc 		c = '\r';
8889578Ssam 	/*
88935811Smarc 	 * Non canonical mode; don't process line editing
8909578Ssam 	 * characters; check high water mark for wakeup.
89135811Smarc 	 *
8929578Ssam 	 */
89340712Skarels 	if ((lflag&ICANON) == 0) {
8949578Ssam 		if (tp->t_rawq.c_cc > TTYHOG) {
89535811Smarc 			if (iflag&IMAXBEL) {
89635811Smarc 				if (tp->t_outq.c_cc < tp->t_hiwat)
89735811Smarc 					(void) ttyoutput(CTRL('g'), tp);
89835811Smarc 			} else
89935811Smarc 				ttyflush(tp, FREAD | FWRITE);
90035811Smarc 		} else {
90135811Smarc 			if (putc(c, &tp->t_rawq) >= 0) {
90235811Smarc 				ttwakeup(tp);
90335811Smarc 				ttyecho(c, tp);
90435811Smarc 			}
9057502Sroot 		}
9069578Ssam 		goto endcase;
9079578Ssam 	}
9089578Ssam 	/*
90935811Smarc 	 * From here on down canonical mode character
9109578Ssam 	 * processing takes place.
9119578Ssam 	 */
91235811Smarc 	/*
91335811Smarc 	 * erase (^H / ^?)
91435811Smarc 	 */
91539407Smarc 	if (CCEQ(cc[VERASE], c)) {
9169578Ssam 		if (tp->t_rawq.c_cc)
9179578Ssam 			ttyrub(unputc(&tp->t_rawq), tp);
9189578Ssam 		goto endcase;
9199578Ssam 	}
92035811Smarc 	/*
92135811Smarc 	 * kill (^U)
92235811Smarc 	 */
92335811Smarc 	if (CCEQ(cc[VKILL], c)) {
92437584Smarc 		if (lflag&ECHOKE && tp->t_rawq.c_cc == tp->t_rocount &&
92540712Skarels 		    (lflag&ECHOPRT) == 0) {
9269578Ssam 			while (tp->t_rawq.c_cc)
9279578Ssam 				ttyrub(unputc(&tp->t_rawq), tp);
9289578Ssam 		} else {
9299578Ssam 			ttyecho(c, tp);
93035811Smarc 			if (lflag&ECHOK || lflag&ECHOKE)
93135811Smarc 				ttyecho('\n', tp);
9329578Ssam 			while (getc(&tp->t_rawq) > 0)
9339578Ssam 				;
9349578Ssam 			tp->t_rocount = 0;
9359578Ssam 		}
9369578Ssam 		tp->t_state &= ~TS_LOCAL;
9379578Ssam 		goto endcase;
9389578Ssam 	}
9399578Ssam 	/*
94035811Smarc 	 * word erase (^W)
9419578Ssam 	 */
94235811Smarc 	if (CCEQ(cc[VWERASE], c)) {
94335811Smarc 		int ctype;
94435811Smarc 
94535811Smarc #define CTYPE(c) ((lflag&ALTWERASE) ? (partab[(c)&TTY_CHARMASK]&0100) : 0)
94635811Smarc 		/*
94735811Smarc 		 * erase whitespace
94835811Smarc 		 */
94935811Smarc 		while ((c = unputc(&tp->t_rawq)) == ' ' || c == '\t')
95035811Smarc 			ttyrub(c, tp);
95135811Smarc 		if (c == -1)
95234492Skarels 			goto endcase;
95335811Smarc 		/*
95435811Smarc 		 * special case last char of token
95535811Smarc 		 */
95635811Smarc 		ttyrub(c, tp);
95735811Smarc 		c = unputc(&tp->t_rawq);
95835811Smarc 		if (c == -1 || c == ' ' || c == '\t') {
95935811Smarc 			if (c != -1)
96035811Smarc 				(void) putc(c, &tp->t_rawq);
96134492Skarels 			goto endcase;
96234492Skarels 		}
96335811Smarc 		/*
96435811Smarc 		 * erase rest of token
96535811Smarc 		 */
96635811Smarc 		ctype = CTYPE(c);
96735811Smarc 		do {
96835811Smarc 			ttyrub(c, tp);
96935811Smarc 			c = unputc(&tp->t_rawq);
97035811Smarc 			if (c == -1)
97135811Smarc 				goto endcase;
97235811Smarc 		} while (c != ' ' && c != '\t' && CTYPE(c) == ctype);
97335811Smarc 		(void) putc(c, &tp->t_rawq);
97435811Smarc 		goto endcase;
97535811Smarc #undef CTYPE
9769578Ssam 	}
9779578Ssam 	/*
97835811Smarc 	 * reprint line (^R)
97935811Smarc 	 */
98035811Smarc 	if (CCEQ(cc[VREPRINT], c)) {
98135811Smarc 		ttyretype(tp);
98235811Smarc 		goto endcase;
98335811Smarc 	}
984*42141Smckusick 	if (CCEQ(cc[VINFO], c)) {
985*42141Smckusick 		pgsignal(tp->t_pgrp, SIGINFO);
986*42141Smckusick 		if ((lflag&NOKERNINFO) == 0)
987*42141Smckusick 			ttyinfo(tp);
988*42141Smckusick 		goto endcase;
989*42141Smckusick 	}
99035811Smarc 	/*
9919578Ssam 	 * Check for input buffer overflow
9929578Ssam 	 */
99310391Ssam 	if (tp->t_rawq.c_cc+tp->t_canq.c_cc >= TTYHOG) {
99435811Smarc 		if (iflag&IMAXBEL) {
99535811Smarc 			if (tp->t_outq.c_cc < tp->t_hiwat)
99635811Smarc 				(void) ttyoutput(CTRL('g'), tp);
99735811Smarc 		} else
99835811Smarc 			ttyflush(tp, FREAD | FWRITE);
9999578Ssam 		goto endcase;
100010391Ssam 	}
10019578Ssam 	/*
10029578Ssam 	 * Put data char in q for user and
10039578Ssam 	 * wakeup on seeing a line delimiter.
10049578Ssam 	 */
10059578Ssam 	if (putc(c, &tp->t_rawq) >= 0) {
100635811Smarc 		if (ttbreakc(c)) {
10079578Ssam 			tp->t_rocount = 0;
10089578Ssam 			catq(&tp->t_rawq, &tp->t_canq);
10097502Sroot 			ttwakeup(tp);
10109578Ssam 		} else if (tp->t_rocount++ == 0)
10119578Ssam 			tp->t_rocol = tp->t_col;
10129578Ssam 		if (tp->t_state&TS_ERASE) {
101335811Smarc 			/*
101435811Smarc 			 * end of prterase \.../
101535811Smarc 			 */
10169578Ssam 			tp->t_state &= ~TS_ERASE;
10179578Ssam 			(void) ttyoutput('/', tp);
10189578Ssam 		}
10199578Ssam 		i = tp->t_col;
10207502Sroot 		ttyecho(c, tp);
102135811Smarc 		if (CCEQ(cc[VEOF], c) && lflag&ECHO) {
102235811Smarc 			/*
102335811Smarc 			 * Place the cursor over the '^' of the ^D.
102435811Smarc 			 */
10259578Ssam 			i = MIN(2, tp->t_col - i);
10269578Ssam 			while (i > 0) {
10279578Ssam 				(void) ttyoutput('\b', tp);
10289578Ssam 				i--;
10299578Ssam 			}
10309578Ssam 		}
10317502Sroot 	}
10329578Ssam endcase:
10339578Ssam 	/*
103435811Smarc 	 * IXANY means allow any character to restart output.
10359578Ssam 	 */
103640712Skarels 	if ((tp->t_state&TS_TTSTOP) && (iflag&IXANY) == 0 &&
103740712Skarels 	    cc[VSTART] != cc[VSTOP])
10387502Sroot 		return;
10399578Ssam restartoutput:
10407502Sroot 	tp->t_state &= ~TS_TTSTOP;
104135811Smarc 	tp->t_lflag &= ~FLUSHO;
10429578Ssam startoutput:
10437502Sroot 	ttstart(tp);
10447502Sroot }
10457502Sroot 
10467502Sroot /*
10479578Ssam  * Put character on TTY output queue, adding delays,
10487502Sroot  * expanding tabs, and handling the CR/NL bit.
10499578Ssam  * This is called both from the top half for output,
10509578Ssam  * and from interrupt level for echoing.
10517502Sroot  * The arguments are the character and the tty structure.
10527502Sroot  * Returns < 0 if putc succeeds, otherwise returns char to resend
10537502Sroot  * Must be recursive.
10547502Sroot  */
10557502Sroot ttyoutput(c, tp)
10567502Sroot 	register c;
10577502Sroot 	register struct tty *tp;
10587502Sroot {
10597502Sroot 	register char *colp;
10607502Sroot 	register ctype;
106135811Smarc 	register long oflag = tp->t_oflag;
106235811Smarc 
106340712Skarels 	if ((oflag&OPOST) == 0) {
106435811Smarc 		if (tp->t_lflag&FLUSHO)
10657502Sroot 			return (-1);
10667502Sroot 		if (putc(c, &tp->t_outq))
10677625Ssam 			return (c);
10687502Sroot 		tk_nout++;
106935811Smarc 		tp->t_outcc++;
10707502Sroot 		return (-1);
10717502Sroot 	}
107235811Smarc 	c &= TTY_CHARMASK;
10737502Sroot 	/*
10747502Sroot 	 * Turn tabs to spaces as required
10757502Sroot 	 */
107635811Smarc 	if (c == '\t' && oflag&OXTABS ) {
10777502Sroot 		register int s;
10787502Sroot 
10797502Sroot 		c = 8 - (tp->t_col&7);
108035811Smarc 		if ((tp->t_lflag&FLUSHO) == 0) {
108117545Skarels 			s = spltty();		/* don't interrupt tabs */
10827502Sroot 			c -= b_to_q("        ", c, &tp->t_outq);
10837502Sroot 			tk_nout += c;
108435811Smarc 			tp->t_outcc += c;
10857502Sroot 			splx(s);
10867502Sroot 		}
10877502Sroot 		tp->t_col += c;
10887502Sroot 		return (c ? -1 : '\t');
10897502Sroot 	}
109035811Smarc 	if (c == CEOT && oflag&ONOEOT)
109135811Smarc 		return(-1);
10927502Sroot 	tk_nout++;
109335811Smarc 	tp->t_outcc++;
10947502Sroot 	/*
10957502Sroot 	 * turn <nl> to <cr><lf> if desired.
10967502Sroot 	 */
109735811Smarc 	if (c == '\n' && (tp->t_oflag&ONLCR) && ttyoutput('\r', tp) >= 0)
10987502Sroot 		return (c);
109935811Smarc 	if ((tp->t_lflag&FLUSHO) == 0 && putc(c, &tp->t_outq))
110035811Smarc 		return (c);
11017502Sroot 	/*
11027502Sroot 	 * Calculate delays.
11037502Sroot 	 * The numbers here represent clock ticks
11047502Sroot 	 * and are not necessarily optimal for all terminals.
11059578Ssam 	 *
11069578Ssam 	 * SHOULD JUST ALLOW USER TO SPECIFY DELAYS
110735811Smarc 	 *
110835811Smarc 	 * (actually, should THROW AWAY terminals which need delays)
11097502Sroot 	 */
11107502Sroot 	colp = &tp->t_col;
11117502Sroot 	ctype = partab[c];
11127502Sroot 	c = 0;
11137502Sroot 	switch (ctype&077) {
11147502Sroot 
11157502Sroot 	case ORDINARY:
11167502Sroot 		(*colp)++;
11177502Sroot 
11187502Sroot 	case CONTROL:
11197502Sroot 		break;
11207502Sroot 
11217502Sroot 	case BACKSPACE:
11227502Sroot 		if (*colp)
11237502Sroot 			(*colp)--;
11247502Sroot 		break;
11257502Sroot 
112613821Ssam 	/*
112713821Ssam 	 * This macro is close enough to the correct thing;
112813821Ssam 	 * it should be replaced by real user settable delays
112913821Ssam 	 * in any event...
113013821Ssam 	 */
113113821Ssam #define	mstohz(ms)	(((ms) * hz) >> 10)
11327502Sroot 	case NEWLINE:
11337502Sroot 		ctype = (tp->t_flags >> 8) & 03;
11347625Ssam 		if (ctype == 1) { /* tty 37 */
113526357Skarels 			if (*colp > 0) {
113626357Skarels 				c = (((unsigned)*colp) >> 4) + 3;
113726357Skarels 				if ((unsigned)c > 6)
113826357Skarels 					c = 6;
113926357Skarels 			}
11409578Ssam 		} else if (ctype == 2) /* vt05 */
114113821Ssam 			c = mstohz(100);
11427502Sroot 		*colp = 0;
11437502Sroot 		break;
11447502Sroot 
11457502Sroot 	case TAB:
11467502Sroot 		ctype = (tp->t_flags >> 10) & 03;
11477625Ssam 		if (ctype == 1) { /* tty 37 */
11487502Sroot 			c = 1 - (*colp | ~07);
11497625Ssam 			if (c < 5)
11507502Sroot 				c = 0;
11517502Sroot 		}
11527502Sroot 		*colp |= 07;
11537502Sroot 		(*colp)++;
11547502Sroot 		break;
11557502Sroot 
11567502Sroot 	case VTAB:
11579578Ssam 		if (tp->t_flags&VTDELAY) /* tty 37 */
11587502Sroot 			c = 0177;
11597502Sroot 		break;
11607502Sroot 
11617502Sroot 	case RETURN:
11627502Sroot 		ctype = (tp->t_flags >> 12) & 03;
11639578Ssam 		if (ctype == 1) /* tn 300 */
116413821Ssam 			c = mstohz(83);
11659578Ssam 		else if (ctype == 2) /* ti 700 */
116613821Ssam 			c = mstohz(166);
11679578Ssam 		else if (ctype == 3) { /* concept 100 */
11687502Sroot 			int i;
11699578Ssam 
11707502Sroot 			if ((i = *colp) >= 0)
11719578Ssam 				for (; i < 9; i++)
11727502Sroot 					(void) putc(0177, &tp->t_outq);
11737502Sroot 		}
11747502Sroot 		*colp = 0;
11757502Sroot 	}
117635811Smarc 	if (c && (tp->t_lflag&FLUSHO) == 0)
117735811Smarc 		(void) putc(c|TTY_QUOTE, &tp->t_outq);
11787502Sroot 	return (-1);
11797502Sroot }
118013821Ssam #undef mstohz
11817502Sroot 
11827502Sroot /*
11837502Sroot  * Called from device's read routine after it has
11847502Sroot  * calculated the tty-structure given as argument.
11857502Sroot  */
118637584Smarc ttread(tp, uio, flag)
11877625Ssam 	register struct tty *tp;
11887722Swnj 	struct uio *uio;
11897502Sroot {
11907502Sroot 	register struct clist *qp;
119135811Smarc 	register int c;
119241383Smarc 	register long lflag;
119335811Smarc 	register u_char *cc = tp->t_cc;
11949859Ssam 	int s, first, error = 0;
11957502Sroot 
11967502Sroot loop:
119741383Smarc 	lflag = tp->t_lflag;
119837584Smarc 	s = spltty();
11999578Ssam 	/*
120037584Smarc 	 * take pending input first
12019578Ssam 	 */
120235811Smarc 	if (lflag&PENDIN)
12037502Sroot 		ttypend(tp);
12049859Ssam 	splx(s);
120540712Skarels 
12069578Ssam 	/*
12079578Ssam 	 * Hang process if it's in the background.
12089578Ssam 	 */
120939555Smarc 	if (isbackground(u.u_procp, tp)) {
121024392Skarels 		if ((u.u_procp->p_sigignore & sigmask(SIGTTIN)) ||
121124392Skarels 		   (u.u_procp->p_sigmask & sigmask(SIGTTIN)) ||
121235811Smarc 		    u.u_procp->p_flag&SVFORK || u.u_procp->p_pgrp->pg_jobc == 0)
12138520Sroot 			return (EIO);
121435811Smarc 		pgsignal(u.u_procp->p_pgrp, SIGTTIN);
121540712Skarels 		if (error = tsleep((caddr_t)&lbolt, TTIPRI | PCATCH, ttybg, 0))
121640712Skarels 			return (error);
121723165Sbloom 		goto loop;
12187502Sroot 	}
121940712Skarels 
12209578Ssam 	/*
122135811Smarc 	 * If canonical, use the canonical queue,
122235811Smarc 	 * else use the raw queue.
122337584Smarc 	 *
122437584Smarc 	 * XXX - should get rid of canonical queue.
122537584Smarc 	 * (actually, should get rid of clists...)
12269578Ssam 	 */
122735811Smarc 	qp = lflag&ICANON ? &tp->t_canq : &tp->t_rawq;
122840712Skarels 
12299578Ssam 	/*
123040712Skarels 	 * If there is no input, sleep on rawq
123140712Skarels 	 * awaiting hardware receipt and notification.
123240712Skarels 	 * If we have data, we don't need to check for carrier.
12339578Ssam 	 */
123417545Skarels 	s = spltty();
12359578Ssam 	if (qp->c_cc <= 0) {
123640712Skarels 		int carrier;
123740712Skarels 
123840712Skarels 		carrier = (tp->t_state&TS_CARR_ON) || (tp->t_cflag&CLOCAL);
123940712Skarels 		if (!carrier && tp->t_state&TS_ISOPEN) {
12409859Ssam 			splx(s);
124140712Skarels 			return (0);	/* EOF */
12427502Sroot 		}
124337728Smckusick 		if (flag & IO_NDELAY) {
124437584Smarc 			splx(s);
124537584Smarc 			return (EWOULDBLOCK);
124637584Smarc 		}
124740712Skarels 		error = tsleep((caddr_t)&tp->t_rawq, TTIPRI | PCATCH,
124840712Skarels 		    carrier ? ttyin : ttopen, 0);
12499859Ssam 		splx(s);
125040712Skarels 		if (error)
125140712Skarels 			return (error);
12529578Ssam 		goto loop;
12539578Ssam 	}
12549859Ssam 	splx(s);
125540712Skarels 
12569578Ssam 	/*
125735811Smarc 	 * Input present, check for input mapping and processing.
12589578Ssam 	 */
12599578Ssam 	first = 1;
12609578Ssam 	while ((c = getc(qp)) >= 0) {
12619578Ssam 		/*
126235811Smarc 		 * delayed suspend (^Y)
12639578Ssam 		 */
126435811Smarc 		if (CCEQ(cc[VDSUSP], c) && lflag&ISIG) {
126539555Smarc 			pgsignal(tp->t_pgrp, SIGTSTP);
12669578Ssam 			if (first) {
126740712Skarels 				if (error = tsleep((caddr_t)&lbolt,
126840712Skarels 				    TTIPRI | PCATCH, ttybg, 0))
126940712Skarels 					break;
12709578Ssam 				goto loop;
12719578Ssam 			}
12729578Ssam 			break;
12737502Sroot 		}
12749578Ssam 		/*
127535811Smarc 		 * Interpret EOF only in canonical mode.
12769578Ssam 		 */
127735811Smarc 		if (CCEQ(cc[VEOF], c) && lflag&ICANON)
12789578Ssam 			break;
12799578Ssam 		/*
12809578Ssam 		 * Give user character.
12819578Ssam 		 */
128240712Skarels  		error = ureadc(c, uio);
12839578Ssam 		if (error)
12849578Ssam 			break;
128514938Smckusick  		if (uio->uio_resid == 0)
12869578Ssam 			break;
12879578Ssam 		/*
128835811Smarc 		 * In canonical mode check for a "break character"
12899578Ssam 		 * marking the end of a "line of input".
12909578Ssam 		 */
129140712Skarels 		if (lflag&ICANON && ttbreakc(c))
12929578Ssam 			break;
12939578Ssam 		first = 0;
12947502Sroot 	}
12959578Ssam 	/*
12969578Ssam 	 * Look to unblock output now that (presumably)
12979578Ssam 	 * the input queue has gone down.
12989578Ssam 	 */
129935811Smarc 	if (tp->t_state&TS_TBLOCK && tp->t_rawq.c_cc < TTYHOG/5) {
130035811Smarc 		if (cc[VSTART] != _POSIX_VDISABLE
130135811Smarc 		   && putc(cc[VSTART], &tp->t_outq) == 0) {
13027502Sroot 			tp->t_state &= ~TS_TBLOCK;
13037502Sroot 			ttstart(tp);
13047502Sroot 		}
130535811Smarc 	}
13068520Sroot 	return (error);
13077502Sroot }
13087502Sroot 
13097502Sroot /*
131025391Skarels  * Check the output queue on tp for space for a kernel message
131125391Skarels  * (from uprintf/tprintf).  Allow some space over the normal
131225391Skarels  * hiwater mark so we don't lose messages due to normal flow
131325391Skarels  * control, but don't let the tty run amok.
131430695Skarels  * Sleeps here are not interruptible, but we return prematurely
131530695Skarels  * if new signals come in.
131625391Skarels  */
131725391Skarels ttycheckoutq(tp, wait)
131825391Skarels 	register struct tty *tp;
131925391Skarels 	int wait;
132025391Skarels {
132130695Skarels 	int hiwat, s, oldsig;
132225391Skarels 
132335811Smarc 	hiwat = tp->t_hiwat;
132425391Skarels 	s = spltty();
132530695Skarels 	oldsig = u.u_procp->p_sig;
132625391Skarels 	if (tp->t_outq.c_cc > hiwat + 200)
132729946Skarels 		while (tp->t_outq.c_cc > hiwat) {
132829946Skarels 			ttstart(tp);
132930695Skarels 			if (wait == 0 || u.u_procp->p_sig != oldsig) {
133029946Skarels 				splx(s);
133129946Skarels 				return (0);
133229946Skarels 			}
133330695Skarels 			timeout(wakeup, (caddr_t)&tp->t_outq, hz);
133429946Skarels 			tp->t_state |= TS_ASLEEP;
133530695Skarels 			sleep((caddr_t)&tp->t_outq, PZERO - 1);
133625391Skarels 		}
133725391Skarels 	splx(s);
133825391Skarels 	return (1);
133925391Skarels }
134025391Skarels 
134125391Skarels /*
13427502Sroot  * Called from the device's write routine after it has
13437502Sroot  * calculated the tty-structure given as argument.
13447502Sroot  */
134537584Smarc ttwrite(tp, uio, flag)
13467625Ssam 	register struct tty *tp;
13479578Ssam 	register struct uio *uio;
13487502Sroot {
13497502Sroot 	register char *cp;
135040712Skarels 	register int cc = 0, ce;
13519578Ssam 	int i, hiwat, cnt, error, s;
13527502Sroot 	char obuf[OBUFSIZ];
13537502Sroot 
135435811Smarc 	hiwat = tp->t_hiwat;
13559578Ssam 	cnt = uio->uio_resid;
13569578Ssam 	error = 0;
13577502Sroot loop:
135837584Smarc 	s = spltty();
135940712Skarels 	if ((tp->t_state&TS_CARR_ON) == 0 && (tp->t_cflag&CLOCAL) == 0) {
136037584Smarc 		if (tp->t_state&TS_ISOPEN) {
136137584Smarc 			splx(s);
136237584Smarc 			return (EIO);
136337728Smckusick 		} else if (flag & IO_NDELAY) {
136437584Smarc 			splx(s);
136540712Skarels 			error = EWOULDBLOCK;
136640712Skarels 			goto out;
136737584Smarc 		} else {
136837584Smarc 			/*
136937584Smarc 			 * sleep awaiting carrier
137037584Smarc 			 */
137140712Skarels 			error = tsleep((caddr_t)&tp->t_rawq, TTIPRI | PCATCH,
137240712Skarels 			    ttopen, 0);
137337584Smarc 			splx(s);
137440712Skarels 			if (error)
137540712Skarels 				goto out;
137637584Smarc 			goto loop;
137737584Smarc 		}
137837584Smarc 	}
137937584Smarc 	splx(s);
13809578Ssam 	/*
13819578Ssam 	 * Hang the process if it's in the background.
13829578Ssam 	 */
138339555Smarc 	if (isbackground(u.u_procp, tp) &&
138435811Smarc 	    (tp->t_lflag&TOSTOP) && (u.u_procp->p_flag&SVFORK)==0 &&
138540712Skarels 	    (u.u_procp->p_sigignore & sigmask(SIGTTOU)) == 0 &&
138640712Skarels 	    (u.u_procp->p_sigmask & sigmask(SIGTTOU)) == 0 &&
138735811Smarc 	     u.u_procp->p_pgrp->pg_jobc) {
138835811Smarc 		pgsignal(u.u_procp->p_pgrp, SIGTTOU);
138940712Skarels 		if (error = tsleep((caddr_t)&lbolt, TTIPRI | PCATCH, ttybg, 0))
139040712Skarels 			goto out;
139121776Sbloom 		goto loop;
13927502Sroot 	}
13939578Ssam 	/*
13949578Ssam 	 * Process the user's data in at most OBUFSIZ
139540712Skarels 	 * chunks.  Perform any output translation.
139640712Skarels 	 * Keep track of high water mark, sleep on overflow
139740712Skarels 	 * awaiting device aid in acquiring new space.
13989578Ssam 	 */
139940712Skarels 	while (uio->uio_resid > 0 || cc > 0) {
140040712Skarels 		if (tp->t_lflag&FLUSHO) {
140140712Skarels 			uio->uio_resid = 0;
140240712Skarels 			return (0);
140340712Skarels 		}
140440712Skarels 		if (tp->t_outq.c_cc > hiwat)
140532067Skarels 			goto ovhiwat;
14069578Ssam 		/*
140740712Skarels 		 * Grab a hunk of data from the user,
140840712Skarels 		 * unless we have some leftover from last time.
14099578Ssam 		 */
14107822Sroot 		if (cc == 0) {
141140712Skarels 			cc = min(uio->uio_resid, OBUFSIZ);
141240712Skarels 			cp = obuf;
141340712Skarels 			error = uiomove(cp, cc, uio);
141440712Skarels 			if (error) {
141540712Skarels 				cc = 0;
141640712Skarels 				break;
141740712Skarels 			}
14187822Sroot 		}
14199578Ssam 		/*
14209578Ssam 		 * If nothing fancy need be done, grab those characters we
14219578Ssam 		 * can handle without any of ttyoutput's processing and
14229578Ssam 		 * just transfer them to the output q.  For those chars
14239578Ssam 		 * which require special processing (as indicated by the
14249578Ssam 		 * bits in partab), call ttyoutput.  After processing
14259578Ssam 		 * a hunk of data, look for FLUSHO so ^O's will take effect
14269578Ssam 		 * immediately.
14279578Ssam 		 */
14289578Ssam 		while (cc > 0) {
142940712Skarels 			if ((tp->t_oflag&OPOST) == 0)
14307502Sroot 				ce = cc;
14317502Sroot 			else {
143234492Skarels 				ce = cc - scanc((unsigned)cc, (u_char *)cp,
143334492Skarels 				   (u_char *)partab, 077);
14349578Ssam 				/*
14359578Ssam 				 * If ce is zero, then we're processing
14369578Ssam 				 * a special character through ttyoutput.
14379578Ssam 				 */
14389578Ssam 				if (ce == 0) {
14397502Sroot 					tp->t_rocount = 0;
14407502Sroot 					if (ttyoutput(*cp, tp) >= 0) {
144121776Sbloom 					    /* no c-lists, wait a bit */
144221776Sbloom 					    ttstart(tp);
144340712Skarels 					    if (error = tsleep((caddr_t)&lbolt,
144440712Skarels 						TTOPRI | PCATCH, ttybuf, 0))
144540712Skarels 						    break;
144621776Sbloom 					    goto loop;
14477502Sroot 					}
14489578Ssam 					cp++, cc--;
144935811Smarc 					if ((tp->t_lflag&FLUSHO) ||
14509578Ssam 					    tp->t_outq.c_cc > hiwat)
14517502Sroot 						goto ovhiwat;
14529578Ssam 					continue;
14537502Sroot 				}
14547502Sroot 			}
14559578Ssam 			/*
14569578Ssam 			 * A bunch of normal characters have been found,
14579578Ssam 			 * transfer them en masse to the output queue and
14589578Ssam 			 * continue processing at the top of the loop.
14599578Ssam 			 * If there are any further characters in this
14609578Ssam 			 * <= OBUFSIZ chunk, the first should be a character
14619578Ssam 			 * requiring special handling by ttyoutput.
14629578Ssam 			 */
14637502Sroot 			tp->t_rocount = 0;
14649578Ssam 			i = b_to_q(cp, ce, &tp->t_outq);
14659578Ssam 			ce -= i;
14669578Ssam 			tp->t_col += ce;
14679578Ssam 			cp += ce, cc -= ce, tk_nout += ce;
146835811Smarc 			tp->t_outcc += ce;
14699578Ssam 			if (i > 0) {
14709578Ssam 				/* out of c-lists, wait a bit */
14717502Sroot 				ttstart(tp);
147240712Skarels 				if (error = tsleep((caddr_t)&lbolt,
147340712Skarels 				    TTOPRI | PCATCH, ttybuf, 0))
147440712Skarels 					break;
147521776Sbloom 				goto loop;
14767502Sroot 			}
147735811Smarc 			if (tp->t_lflag&FLUSHO || tp->t_outq.c_cc > hiwat)
147840712Skarels 				break;
14797502Sroot 		}
148035811Smarc 		ttstart(tp);
14817502Sroot 	}
148240712Skarels out:
148340712Skarels 	/*
148440712Skarels 	 * If cc is nonzero, we leave the uio structure inconsistent,
148540712Skarels 	 * as the offset and iov pointers have moved forward,
148640712Skarels 	 * but it doesn't matter (the call will either return short
148740712Skarels 	 * or restart with a new uio).
148840712Skarels 	 */
148940712Skarels 	uio->uio_resid += cc;
14908520Sroot 	return (error);
149140712Skarels 
14927502Sroot ovhiwat:
149332067Skarels 	ttstart(tp);
149432067Skarels 	s = spltty();
14959578Ssam 	/*
149635811Smarc 	 * This can only occur if FLUSHO is set in t_lflag,
149732067Skarels 	 * or if ttstart/oproc is synchronous (or very fast).
14989578Ssam 	 */
14997502Sroot 	if (tp->t_outq.c_cc <= hiwat) {
15009578Ssam 		splx(s);
15017502Sroot 		goto loop;
15027502Sroot 	}
150337728Smckusick 	if (flag & IO_NDELAY) {
150417545Skarels 		splx(s);
150540712Skarels 		uio->uio_resid += cc;
15067822Sroot 		if (uio->uio_resid == cnt)
15078520Sroot 			return (EWOULDBLOCK);
15088520Sroot 		return (0);
15097502Sroot 	}
15107502Sroot 	tp->t_state |= TS_ASLEEP;
151140712Skarels 	error = tsleep((caddr_t)&tp->t_outq, TTOPRI | PCATCH, ttyout, 0);
15129578Ssam 	splx(s);
151340712Skarels 	if (error)
151440712Skarels 		goto out;
15157502Sroot 	goto loop;
15167502Sroot }
15177502Sroot 
15187502Sroot /*
15197502Sroot  * Rubout one character from the rawq of tp
15207502Sroot  * as cleanly as possible.
15217502Sroot  */
15227502Sroot ttyrub(c, tp)
15237625Ssam 	register c;
15247625Ssam 	register struct tty *tp;
15257502Sroot {
15267502Sroot 	register char *cp;
15277502Sroot 	register int savecol;
15287502Sroot 	int s;
15297502Sroot 	char *nextc();
15307502Sroot 
153135811Smarc 	if ((tp->t_lflag&ECHO) == 0)
15327502Sroot 		return;
153335811Smarc 	tp->t_lflag &= ~FLUSHO;
153435811Smarc 	if (tp->t_lflag&ECHOE) {
15357502Sroot 		if (tp->t_rocount == 0) {
15367502Sroot 			/*
15377502Sroot 			 * Screwed by ttwrite; retype
15387502Sroot 			 */
15397502Sroot 			ttyretype(tp);
15407502Sroot 			return;
15417502Sroot 		}
154235811Smarc 		if (c == ('\t'|TTY_QUOTE) || c == ('\n'|TTY_QUOTE))
15437502Sroot 			ttyrubo(tp, 2);
154435811Smarc 		else switch (partab[c&=0377]&077) {
15457502Sroot 
15467502Sroot 		case ORDINARY:
154735811Smarc 			ttyrubo(tp, 1);
15487502Sroot 			break;
15497502Sroot 
15507502Sroot 		case VTAB:
15517502Sroot 		case BACKSPACE:
15527502Sroot 		case CONTROL:
15537502Sroot 		case RETURN:
155435811Smarc 			if (tp->t_lflag&ECHOCTL)
15557502Sroot 				ttyrubo(tp, 2);
15567502Sroot 			break;
15577502Sroot 
155835811Smarc 		case TAB: {
155935811Smarc 			int c;
156035811Smarc 
15617502Sroot 			if (tp->t_rocount < tp->t_rawq.c_cc) {
15627502Sroot 				ttyretype(tp);
15637502Sroot 				return;
15647502Sroot 			}
156517545Skarels 			s = spltty();
15667502Sroot 			savecol = tp->t_col;
15679578Ssam 			tp->t_state |= TS_CNTTB;
156835811Smarc 			tp->t_lflag |= FLUSHO;
15697502Sroot 			tp->t_col = tp->t_rocol;
15709578Ssam 			cp = tp->t_rawq.c_cf;
157139407Smarc 			if (cp)
157239407Smarc 				c = *cp;	/* XXX FIX NEXTC */
157335811Smarc 			for (; cp; cp = nextc(&tp->t_rawq, cp, &c))
157435811Smarc 				ttyecho(c, tp);
157535811Smarc 			tp->t_lflag &= ~FLUSHO;
15769578Ssam 			tp->t_state &= ~TS_CNTTB;
15777502Sroot 			splx(s);
15787502Sroot 			/*
15797502Sroot 			 * savecol will now be length of the tab
15807502Sroot 			 */
15817502Sroot 			savecol -= tp->t_col;
15827502Sroot 			tp->t_col += savecol;
15837502Sroot 			if (savecol > 8)
15847502Sroot 				savecol = 8;		/* overflow screw */
15857502Sroot 			while (--savecol >= 0)
15867502Sroot 				(void) ttyoutput('\b', tp);
15877502Sroot 			break;
158835811Smarc 		}
15897502Sroot 
15907502Sroot 		default:
159137584Smarc 			/* XXX */
159235811Smarc 			printf("ttyrub: would panic c = %d, val = %d\n",
159335811Smarc 				c, partab[c&=0377]&077);
159435811Smarc 			/*panic("ttyrub");*/
15957502Sroot 		}
159635811Smarc 	} else if (tp->t_lflag&ECHOPRT) {
15979578Ssam 		if ((tp->t_state&TS_ERASE) == 0) {
15987502Sroot 			(void) ttyoutput('\\', tp);
15999578Ssam 			tp->t_state |= TS_ERASE;
16007502Sroot 		}
16017502Sroot 		ttyecho(c, tp);
16027502Sroot 	} else
160335811Smarc 		ttyecho(tp->t_cc[VERASE], tp);
16047502Sroot 	tp->t_rocount--;
16057502Sroot }
16067502Sroot 
16077502Sroot /*
16087502Sroot  * Crt back over cnt chars perhaps
16097502Sroot  * erasing them.
16107502Sroot  */
16117502Sroot ttyrubo(tp, cnt)
16127625Ssam 	register struct tty *tp;
16137625Ssam 	int cnt;
16147502Sroot {
16157502Sroot 
16167502Sroot 	while (--cnt >= 0)
161740712Skarels 		ttyoutstr("\b \b", tp);
16187502Sroot }
16197502Sroot 
16207502Sroot /*
16217502Sroot  * Reprint the rawq line.
16227502Sroot  * We assume c_cc has already been checked.
16237502Sroot  */
16247502Sroot ttyretype(tp)
16257625Ssam 	register struct tty *tp;
16267502Sroot {
16277502Sroot 	register char *cp;
16287502Sroot 	char *nextc();
162935811Smarc 	int s, c;
16307502Sroot 
163135811Smarc 	if (tp->t_cc[VREPRINT] != _POSIX_VDISABLE)
163235811Smarc 		ttyecho(tp->t_cc[VREPRINT], tp);
16337502Sroot 	(void) ttyoutput('\n', tp);
163417545Skarels 	s = spltty();
163535811Smarc 	/*** XXX *** FIX *** NEXTC IS BROKEN - DOESN'T CHECK QUOTE
163635811Smarc 	  BIT OF FIRST CHAR ****/
163735811Smarc 	for (cp = tp->t_canq.c_cf, c=(cp?*cp:0); cp; cp = nextc(&tp->t_canq, cp, &c)) {
163835811Smarc 		ttyecho(c, tp);
163935811Smarc 	}
164035811Smarc 	for (cp = tp->t_rawq.c_cf, c=(cp?*cp:0); cp; cp = nextc(&tp->t_rawq, cp, &c)) {
164135811Smarc 		ttyecho(c, tp);
164235811Smarc 	}
16439578Ssam 	tp->t_state &= ~TS_ERASE;
16447502Sroot 	splx(s);
16457502Sroot 	tp->t_rocount = tp->t_rawq.c_cc;
16467502Sroot 	tp->t_rocol = 0;
16477502Sroot }
16487502Sroot 
16497502Sroot /*
165035811Smarc  * Echo a typed character to the terminal.
16517502Sroot  */
16527502Sroot ttyecho(c, tp)
16537625Ssam 	register c;
16547625Ssam 	register struct tty *tp;
16557502Sroot {
16569578Ssam 	if ((tp->t_state&TS_CNTTB) == 0)
165735811Smarc 		tp->t_lflag &= ~FLUSHO;
165840712Skarels 	if ((tp->t_lflag&ECHO) == 0 && ((tp->t_lflag&ECHONL) == 0 || c == '\n'))
16597502Sroot 		return;
166035811Smarc 	if (tp->t_lflag&ECHOCTL) {
166140712Skarels 		if ((c&TTY_CHARMASK) <= 037 && c != '\t' && c != '\n' ||
166240712Skarels 		    c == 0177) {
16637502Sroot 			(void) ttyoutput('^', tp);
166435811Smarc 			c &= TTY_CHARMASK;
16657502Sroot 			if (c == 0177)
16667502Sroot 				c = '?';
16677502Sroot 			else
16687502Sroot 				c += 'A' - 1;
16697502Sroot 		}
16707502Sroot 	}
167135811Smarc 	(void) ttyoutput(c, tp);
16727502Sroot }
16737502Sroot 
16747502Sroot /*
16757502Sroot  * send string cp to tp
16767502Sroot  */
167740712Skarels ttyoutstr(cp, tp)
16787625Ssam 	register char *cp;
16797625Ssam 	register struct tty *tp;
16807502Sroot {
16817502Sroot 	register char c;
16827502Sroot 
16837502Sroot 	while (c = *cp++)
16847502Sroot 		(void) ttyoutput(c, tp);
16857502Sroot }
16867502Sroot 
16877502Sroot ttwakeup(tp)
16887502Sroot 	struct tty *tp;
16897502Sroot {
16907502Sroot 
16917502Sroot 	if (tp->t_rsel) {
16927502Sroot 		selwakeup(tp->t_rsel, tp->t_state&TS_RCOLL);
16937502Sroot 		tp->t_state &= ~TS_RCOLL;
16947502Sroot 		tp->t_rsel = 0;
16957502Sroot 	}
169612752Ssam 	if (tp->t_state & TS_ASYNC)
169739555Smarc 		pgsignal(tp->t_pgrp, SIGIO);
16987502Sroot 	wakeup((caddr_t)&tp->t_rawq);
16997502Sroot }
170035811Smarc 
170135811Smarc /*
170235811Smarc  * set tty hi and low water marks
170335811Smarc  *
170435811Smarc  * Try to arrange the dynamics so there's about one second
170535811Smarc  * from hi to low water.
170635811Smarc  *
170735811Smarc  */
170835811Smarc ttsetwater(tp)
170935811Smarc 	struct tty *tp;
171035811Smarc {
171135811Smarc 	register cps = tp->t_ospeed / 10;
171235811Smarc 	register x;
171335811Smarc 
171435811Smarc #define clamp(x, h, l) ((x)>h ? h : ((x)<l) ? l : (x))
171535811Smarc 	tp->t_lowat = x = clamp(cps/2, TTMAXLOWAT, TTMINLOWAT);
171635811Smarc 	x += cps;
171735811Smarc 	x = clamp(x, TTMAXHIWAT, TTMINHIWAT);
171835811Smarc 	tp->t_hiwat = roundup(x, CBSIZE);
171935811Smarc #undef clamp
172035811Smarc }
172135811Smarc 
172235811Smarc ttspeedtab(speed, table)
172335811Smarc 	struct speedtab table[];
172435811Smarc {
172535811Smarc 	register int i;
172635811Smarc 
172735811Smarc 	for (i = 0; table[i].sp_speed != -1; i++)
172835811Smarc 		if (table[i].sp_speed == speed)
172935811Smarc 			return(table[i].sp_code);
173035811Smarc 	return(-1);
173135811Smarc }
173239407Smarc 
173341177Smarc int ttyhostname = 0;
173439407Smarc /*
173539407Smarc  * (^T)
173639407Smarc  * Report on state of foreground process group.
173739407Smarc  */
173839407Smarc ttyinfo(tp)
173939407Smarc 	struct tty *tp;
174039407Smarc {
174141177Smarc 	register struct proc *p, *pick = NULL;
174241177Smarc 	register char *cp = hostname;
174341177Smarc 	int x, s;
174441177Smarc 	struct timeval utime, stime;
174541177Smarc #define	pgtok(a)	((a)/(1024/NBPG))
174639407Smarc 
174739407Smarc 	if (ttycheckoutq(tp,0) == 0)
174839407Smarc 		return;
174941177Smarc 	/*
175041177Smarc 	 * hostname
175141177Smarc 	 */
175241177Smarc 	if (ttyhostname) {
175341177Smarc 		if (*cp == '\0')
175441177Smarc 			ttyprintf(tp, "amnesia");
175541177Smarc 		else
175641177Smarc 			while (*cp && *cp != '.')
175741177Smarc 				tputchar(*cp++, tp);
175841177Smarc 		tputchar(' ');
175941177Smarc 	}
176041177Smarc 	/*
176141177Smarc 	 * load average
176241177Smarc 	 */
176341177Smarc 	x = (averunnable[0] * 100 + FSCALE/2) >> FSHIFT;
176441177Smarc 	ttyprintf(tp, "load: %d.", x/100);
176541177Smarc 	ttyoutint(x%100, 10, 2, tp);
176639555Smarc 	if (tp->t_session == NULL)
176741177Smarc 		ttyprintf(tp, " not a controlling terminal\n");
176841177Smarc 	else if (tp->t_pgrp == NULL)
176941177Smarc 		ttyprintf(tp, " no foreground process group\n");
177041177Smarc 	else if ((p = tp->t_pgrp->pg_mem) == NULL)
177141177Smarc 		ttyprintf(tp, " empty foreground process group\n");
177239407Smarc 	else {
177341177Smarc 		/* pick interesting process */
177439407Smarc 		for (; p != NULL; p = p->p_pgrpnxt) {
177541177Smarc 			if (proc_compare(pick, p))
177641177Smarc 				pick = p;
177739407Smarc 		}
177841177Smarc 		ttyprintf(tp, "  cmd: %s %d [%s] ",
177941177Smarc 			pick->p_comm, pick->p_pid,
178041177Smarc 			pick->p_wmesg ? pick->p_wmesg : "running");
178141177Smarc 		/*
178241177Smarc 		 * cpu time
178341177Smarc 		 */
178441177Smarc 		if (u.u_procp == pick)
178541177Smarc 			s = splclock();
178641177Smarc 		utime = pick->p_utime;
178741177Smarc 		stime = pick->p_stime;
178841177Smarc 		if (u.u_procp == pick)
178941177Smarc 			splx(s);
179041177Smarc 		/* user time */
179141177Smarc 		x = (utime.tv_usec + 5000) / 10000; /* scale to 100's */
179241177Smarc 		ttyoutint(utime.tv_sec, 10, 1, tp);
179341177Smarc 		tputchar('.', tp);
179441177Smarc 		ttyoutint(x, 10, 2, tp);
179541177Smarc 		tputchar('u', tp);
179641177Smarc 		tputchar(' ', tp);
179741177Smarc 		/* system time */
179841177Smarc 		x = (stime.tv_usec + 5000) / 10000; /* scale to 100's */
179941177Smarc 		ttyoutint(stime.tv_sec, 10, 1, tp);
180041177Smarc 		tputchar('.', tp);
180141177Smarc 		ttyoutint(x, 10, 2, tp);
180241177Smarc 		tputchar('s', tp);
180341177Smarc 		tputchar(' ', tp);
180441177Smarc 		/*
180541177Smarc 		 * pctcpu
180641177Smarc 		 */
180741177Smarc 		x = pick->p_pctcpu * 10000 + FSCALE/2 >> FSHIFT;
180841177Smarc 		ttyoutint(x/100, 10, 1, tp);
180941177Smarc #ifdef notdef	/* do we really want this ??? */
181041177Smarc 		tputchar('.', tp);
181141177Smarc 		ttyoutint(x%100, 10, 2, tp);
181241177Smarc #endif
181341177Smarc 		ttyprintf(tp, "%% %dk\n", pgtok(pick->p_ssize + pick->p_dsize));
181439407Smarc 	}
181541177Smarc 	tp->t_rocount = 0;	/* so pending input will be retyped if BS */
181639407Smarc }
181739407Smarc 
181841177Smarc ttyoutint(n, base, min, tp)
181941177Smarc 	register int n, base, min;
182041177Smarc 	register struct tty *tp;
182141177Smarc {
182241177Smarc 	char info[16];
182341177Smarc 	register char *p = info;
182441177Smarc 
182541177Smarc 	while (--min >= 0 || n) {
182641177Smarc 		*p++ = "0123456789abcdef"[n%base];
182741177Smarc 		n /= base;
182841177Smarc 	}
182941177Smarc 	while (p > info)
183041177Smarc 		ttyoutput(*--p, tp);
183141177Smarc }
183241177Smarc 
183341177Smarc /*
183441177Smarc  * Returns 1 if p2 is "better" than p1
183541177Smarc  *
183641177Smarc  * The algorithm for picking the "interesting" process is thus:
183741177Smarc  *
183841177Smarc  *	1) (Only foreground processes are eligable - implied)
183941177Smarc  *	2) Runnable processes are favored over anything
184041177Smarc  *	   else.  The runner with the highest cpu
184141177Smarc  *	   utilization is picked (p_cpu).  Ties are
184241177Smarc  *	   broken by picking the highest pid.
184341177Smarc  *	3  Next, the sleeper with the shortest sleep
184441177Smarc  *	   time is favored.  With ties, we pick out
184541177Smarc  *	   just "short-term" sleepers (SSINTR == 0).
184641177Smarc  *	   Further ties are broken by picking the highest
184741177Smarc  *	   pid.
184841177Smarc  *
184941177Smarc  */
185041177Smarc #define isrun(p)	(((p)->p_stat == SRUN) || ((p)->p_stat == SIDL))
185141177Smarc proc_compare(p1, p2)
185241177Smarc 	register struct proc *p1, *p2;
185341177Smarc {
185441177Smarc 
185541177Smarc 	if (p1 == NULL)
185641177Smarc 		return (1);
185741177Smarc 	/*
185841177Smarc 	 * see if at least one of them is runnable
185941177Smarc 	 */
186041177Smarc 	switch (isrun(p1)<<1 | isrun(p2)) {
186141177Smarc 	case 0x01:
186241177Smarc 		return (1);
186341177Smarc 	case 0x10:
186441177Smarc 		return (0);
186541177Smarc 	case 0x11:
186641177Smarc 		/*
186741177Smarc 		 * tie - favor one with highest recent cpu utilization
186841177Smarc 		 */
186941177Smarc 		if (p2->p_cpu > p1->p_cpu)
187041177Smarc 			return (1);
187141177Smarc 		if (p1->p_cpu > p2->p_cpu)
187241177Smarc 			return (0);
187341177Smarc 		return (p2->p_pid > p1->p_pid);	/* tie - return highest pid */
187441177Smarc 	}
187541177Smarc 	/*
187641177Smarc 	 * pick the one with the smallest sleep time
187741177Smarc 	 */
187841177Smarc 	if (p2->p_slptime > p1->p_slptime)
187941177Smarc 		return (0);
188041177Smarc 	if (p1->p_slptime > p2->p_slptime)
188141177Smarc 		return (1);
188241177Smarc 	/*
188341177Smarc 	 * favor one sleeping in a non-interruptible sleep
188441177Smarc 	 */
188541177Smarc 	if (p1->p_flag&SSINTR && (p2->p_flag&SSINTR) == 0)
188641177Smarc 		return (1);
188741177Smarc 	if (p2->p_flag&SSINTR && (p1->p_flag&SSINTR) == 0)
188841177Smarc 		return (0);
188941177Smarc 	return(p2->p_pid > p1->p_pid);		/* tie - return highest pid */
189041177Smarc }
189139407Smarc #define TOTTY	0x2	/* XXX should be in header */
189239407Smarc /*VARARGS2*/
189339407Smarc ttyprintf(tp, fmt, x1)
189439555Smarc 	struct tty *tp;
189539407Smarc 	char *fmt;
189639407Smarc 	unsigned x1;
189739407Smarc {
189839555Smarc 	prf(fmt, &x1, TOTTY, (caddr_t)tp);
189939407Smarc }
190039555Smarc 
190139555Smarc /*
190239555Smarc  * Output char to tty; console putchar style.
190339555Smarc  */
190439555Smarc tputchar(c, tp)
190539555Smarc 	int c;
190639555Smarc 	struct tty *tp;
190739555Smarc {
190839555Smarc 	register s = spltty();
190939555Smarc 
191039555Smarc 	if ((tp->t_state & (TS_CARR_ON | TS_ISOPEN))
191139555Smarc 	    == (TS_CARR_ON | TS_ISOPEN)) {
191239555Smarc 		if (c == '\n')
191339555Smarc 			(void) ttyoutput('\r', tp);
191439555Smarc 		(void) ttyoutput(c, tp);
191539555Smarc 		ttstart(tp);
191639555Smarc 		splx(s);
191739555Smarc 		return (0);
191839555Smarc 	}
191939555Smarc 	splx(s);
192039555Smarc 	return (-1);
192139555Smarc }
1922