xref: /csrg-svn/sys/kern/tty.c (revision 43093)
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*43093Smarc  *	@(#)tty.c	7.30 (Berkeley) 06/14/90
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;
12343092Smarc 		if ((error = tsleep((caddr_t)&tp->t_outq, TTOPRI | PCATCH,
12443092Smarc 				    ttyout, 0)) ||
12543092Smarc 		    (error = ttclosed(tp)))
12640712Skarels 			break;
127903Sbill 	}
1289859Ssam 	splx(s);
12940712Skarels 	return (error);
13039Sbill }
13139Sbill 
13239Sbill /*
1339578Ssam  * Flush all TTY queues
13439Sbill  */
13512752Ssam ttyflush(tp, rw)
1367625Ssam 	register struct tty *tp;
13739Sbill {
138903Sbill 	register s;
139903Sbill 
14017545Skarels 	s = spltty();
141903Sbill 	if (rw & FREAD) {
142903Sbill 		while (getc(&tp->t_canq) >= 0)
143903Sbill 			;
14437584Smarc 		ttwakeup(tp);
145903Sbill 	}
146903Sbill 	if (rw & FWRITE) {
14737584Smarc 		wakeup((caddr_t)&tp->t_outq); /* XXX? what about selwakeup? */
1485408Swnj 		tp->t_state &= ~TS_TTSTOP;
1495426Swnj 		(*cdevsw[major(tp->t_dev)].d_stop)(tp, rw);
150903Sbill 		while (getc(&tp->t_outq) >= 0)
151903Sbill 			;
152903Sbill 	}
153903Sbill 	if (rw & FREAD) {
154903Sbill 		while (getc(&tp->t_rawq) >= 0)
155903Sbill 			;
1569578Ssam 		tp->t_rocount = 0;
157903Sbill 		tp->t_rocol = 0;
1589578Ssam 		tp->t_state &= ~TS_LOCAL;
159903Sbill 	}
160903Sbill 	splx(s);
16139Sbill }
16239Sbill 
163903Sbill /*
164903Sbill  * Send stop character on input overflow.
165903Sbill  */
166903Sbill ttyblock(tp)
1677625Ssam 	register struct tty *tp;
16839Sbill {
169903Sbill 	register x;
1709578Ssam 
171903Sbill 	x = tp->t_rawq.c_cc + tp->t_canq.c_cc;
172903Sbill 	if (tp->t_rawq.c_cc > TTYHOG) {
17312752Ssam 		ttyflush(tp, FREAD|FWRITE);
1745408Swnj 		tp->t_state &= ~TS_TBLOCK;
175903Sbill 	}
17615118Skarels 	/*
17715118Skarels 	 * Block further input iff:
17815118Skarels 	 * Current input > threshold AND input is available to user program
17915118Skarels 	 */
18042350Smckusick 	if (x >= TTYHOG/2 && (tp->t_state & TS_TBLOCK) == 0 &&
18140712Skarels 	    ((tp->t_lflag&ICANON) == 0) || (tp->t_canq.c_cc > 0) &&
18235811Smarc 	    tp->t_cc[VSTOP] != _POSIX_VDISABLE) {
18342350Smckusick 		if (putc(tp->t_cc[VSTOP], &tp->t_outq) == 0) {
18415118Skarels 			tp->t_state |= TS_TBLOCK;
18515118Skarels 			ttstart(tp);
18615118Skarels 		}
187903Sbill 	}
18839Sbill }
18939Sbill 
19039Sbill /*
191903Sbill  * Restart typewriter output following a delay
192903Sbill  * timeout.
193903Sbill  * The name of the routine is passed to the timeout
194903Sbill  * subroutine and it is called during a clock interrupt.
195121Sbill  */
196903Sbill ttrstrt(tp)
19737584Smarc 	struct tty *tp;
198121Sbill {
199121Sbill 
20040712Skarels #ifdef DIAGNOSTIC
2019578Ssam 	if (tp == 0)
2029578Ssam 		panic("ttrstrt");
20340712Skarels #endif
2045408Swnj 	tp->t_state &= ~TS_TIMEOUT;
205903Sbill 	ttstart(tp);
206121Sbill }
207121Sbill 
208121Sbill /*
209903Sbill  * Start output on the typewriter. It is used from the top half
210903Sbill  * after some characters have been put on the output queue,
211903Sbill  * from the interrupt routine to transmit the next
212903Sbill  * character, and after a timeout has finished.
21339Sbill  */
214903Sbill ttstart(tp)
21537584Smarc 	struct tty *tp;
21639Sbill {
21739Sbill 
21832067Skarels 	if (tp->t_oproc)		/* kludge for pty */
219903Sbill 		(*tp->t_oproc)(tp);
22039Sbill }
22139Sbill 
22239Sbill /*
223903Sbill  * Common code for tty ioctls.
22439Sbill  */
2251780Sbill /*ARGSUSED*/
2267625Ssam ttioctl(tp, com, data, flag)
2277625Ssam 	register struct tty *tp;
2287625Ssam 	caddr_t data;
22939Sbill {
23039Sbill 	extern int nldisp;
23137554Smckusick 	int s, error;
23239Sbill 
233903Sbill 	/*
234903Sbill 	 * If the ioctl involves modification,
23517545Skarels 	 * hang if in the background.
236903Sbill 	 */
2377625Ssam 	switch (com) {
23839Sbill 
23935811Smarc 	case TIOCSETD:
240903Sbill 	case TIOCFLUSH:
24135811Smarc 	/*case TIOCSPGRP:*/
2429325Ssam 	case TIOCSTI:
24317598Sbloom 	case TIOCSWINSZ:
24435811Smarc 	case TIOCSETA:
24535811Smarc 	case TIOCSETAW:
24635811Smarc 	case TIOCSETAF:
24739407Smarc /**** these get removed ****
24835811Smarc 	case TIOCSETAS:
24935811Smarc 	case TIOCSETAWS:
25035811Smarc 	case TIOCSETAFS:
25139407Smarc /***************************/
25240030Smarc #ifdef COMPAT_43
25340030Smarc 	case TIOCSETP:
25440030Smarc 	case TIOCSETN:
25540030Smarc 	case TIOCSETC:
25640030Smarc 	case TIOCSLTC:
25740030Smarc 	case TIOCLBIS:
25840030Smarc 	case TIOCLBIC:
25940030Smarc 	case TIOCLSET:
26040030Smarc 	case OTIOCSETD:
26140030Smarc #endif
26239555Smarc 		while (isbackground(u.u_procp, tp) &&
26335811Smarc 		   u.u_procp->p_pgrp->pg_jobc &&
264903Sbill 		   (u.u_procp->p_flag&SVFORK) == 0 &&
26540712Skarels 		   (u.u_procp->p_sigignore & sigmask(SIGTTOU)) == 0 &&
26640712Skarels 		   (u.u_procp->p_sigmask & sigmask(SIGTTOU)) == 0) {
26742882Smarc 			pgsignal(u.u_procp->p_pgrp, SIGTTOU, 1);
26843092Smarc 			if ((error = tsleep((caddr_t)&lbolt, TTOPRI | PCATCH,
26943092Smarc 					    ttybg, 0)) ||
27043092Smarc 			    (error = ttclosed(tp)))
27140712Skarels 				return (error);
272903Sbill 		}
273903Sbill 		break;
274903Sbill 	}
275903Sbill 
2769578Ssam 	/*
2779578Ssam 	 * Process the ioctl.
2789578Ssam 	 */
2797625Ssam 	switch (com) {
280903Sbill 
2818556Sroot 	/* get discipline number */
28239Sbill 	case TIOCGETD:
2837625Ssam 		*(int *)data = tp->t_line;
28439Sbill 		break;
28539Sbill 
2868556Sroot 	/* set line discipline */
2877625Ssam 	case TIOCSETD: {
2887625Ssam 		register int t = *(int *)data;
28935811Smarc 		dev_t dev = tp->t_dev;
2907625Ssam 
29135811Smarc 		if ((unsigned)t >= nldisp)
29210851Ssam 			return (ENXIO);
29325584Skarels 		if (t != tp->t_line) {
29425584Skarels 			s = spltty();
29525584Skarels 			(*linesw[tp->t_line].l_close)(tp);
29625584Skarels 			error = (*linesw[t].l_open)(dev, tp);
29725584Skarels 			if (error) {
29835811Smarc 				(void)(*linesw[tp->t_line].l_open)(dev, tp);
29925584Skarels 				splx(s);
30025584Skarels 				return (error);
30125584Skarels 			}
30225584Skarels 			tp->t_line = t;
30310851Ssam 			splx(s);
30410851Ssam 		}
30539Sbill 		break;
3067625Ssam 	}
30739Sbill 
3088556Sroot 	/* prevent more opens on channel */
3095614Swnj 	case TIOCEXCL:
3105614Swnj 		tp->t_state |= TS_XCLUDE;
3115614Swnj 		break;
3125614Swnj 
3135614Swnj 	case TIOCNXCL:
3145614Swnj 		tp->t_state &= ~TS_XCLUDE;
3155614Swnj 		break;
3165614Swnj 
31739Sbill 	case TIOCHPCL:
31835811Smarc 		tp->t_cflag |= HUPCL;
31939Sbill 		break;
32039Sbill 
3213942Sbugs 	case TIOCFLUSH: {
3227625Ssam 		register int flags = *(int *)data;
3237625Ssam 
3247625Ssam 		if (flags == 0)
3253942Sbugs 			flags = FREAD|FWRITE;
3267625Ssam 		else
3277625Ssam 			flags &= FREAD|FWRITE;
32812752Ssam 		ttyflush(tp, flags);
32939Sbill 		break;
3303944Sbugs 	}
33139Sbill 
33237584Smarc 	case FIOASYNC:
33337584Smarc 		if (*(int *)data)
33437584Smarc 			tp->t_state |= TS_ASYNC;
33537584Smarc 		else
33637584Smarc 			tp->t_state &= ~TS_ASYNC;
33737584Smarc 		break;
33837584Smarc 
33937584Smarc 	case FIONBIO:
34037584Smarc 		break;	/* XXX remove */
34137584Smarc 
3428556Sroot 	/* return number of characters immediately available */
3437625Ssam 	case FIONREAD:
3447625Ssam 		*(off_t *)data = ttnread(tp);
345174Sbill 		break;
346174Sbill 
34713077Ssam 	case TIOCOUTQ:
34813077Ssam 		*(int *)data = tp->t_outq.c_cc;
34913077Ssam 		break;
35013077Ssam 
3518589Sroot 	case TIOCSTOP:
35217545Skarels 		s = spltty();
3539578Ssam 		if ((tp->t_state&TS_TTSTOP) == 0) {
3545573Swnj 			tp->t_state |= TS_TTSTOP;
3555573Swnj 			(*cdevsw[major(tp->t_dev)].d_stop)(tp, 0);
3565573Swnj 		}
3577625Ssam 		splx(s);
3585573Swnj 		break;
3595573Swnj 
3608589Sroot 	case TIOCSTART:
36117545Skarels 		s = spltty();
36235811Smarc 		if ((tp->t_state&TS_TTSTOP) || (tp->t_lflag&FLUSHO)) {
3635573Swnj 			tp->t_state &= ~TS_TTSTOP;
36435811Smarc 			tp->t_lflag &= ~FLUSHO;
3655573Swnj 			ttstart(tp);
3665573Swnj 		}
3677625Ssam 		splx(s);
3685573Swnj 		break;
3695573Swnj 
3709325Ssam 	/*
3719325Ssam 	 * Simulate typing of a character at the terminal.
3729325Ssam 	 */
3739325Ssam 	case TIOCSTI:
37417183Smckusick 		if (u.u_uid && (flag & FREAD) == 0)
37517183Smckusick 			return (EPERM);
37639555Smarc 		if (u.u_uid && !isctty(u.u_procp, tp))
3779325Ssam 			return (EACCES);
3789578Ssam 		(*linesw[tp->t_line].l_rint)(*(char *)data, tp);
3799325Ssam 		break;
3809325Ssam 
38135811Smarc 	case TIOCGETA: {
38235811Smarc 		struct termios *t = (struct termios *)data;
38312752Ssam 
38435811Smarc 		bcopy(&tp->t_termios, t, sizeof(struct termios));
38535811Smarc 		break;
38635811Smarc 	}
38735811Smarc 
38839407Smarc 	/*** THIS ALL GETS REMOVED ***/
38939407Smarc 	case JUNK_TIOCSETAS:
39039407Smarc 	case JUNK_TIOCSETAWS:
39139407Smarc 	case JUNK_TIOCSETAFS:
39239407Smarc 		((struct termios *)data)->c_cflag |= CIGNORE;
39339407Smarc 		switch(com) {
39439407Smarc 		case JUNK_TIOCSETAS:
39539407Smarc 			com = TIOCSETA;
39639407Smarc 			break;
39739407Smarc 		case JUNK_TIOCSETAWS:
39839407Smarc 			com = TIOCSETAW;
39939407Smarc 			break;
40039407Smarc 		case JUNK_TIOCSETAFS:
40139407Smarc 			com = TIOCSETAF;
40239407Smarc 			break;
40339407Smarc 		}
40439407Smarc 	/*******************************/
40539407Smarc 		/*FALLTHROGH*/
40635811Smarc 	case TIOCSETA:
40735811Smarc 	case TIOCSETAW:
40837584Smarc 	case TIOCSETAF: {
40935811Smarc 		register struct termios *t = (struct termios *)data;
41040712Skarels 
41117545Skarels 		s = spltty();
41239407Smarc 		if (com == TIOCSETAW || com == TIOCSETAF) {
41340712Skarels 			if (error = ttywait(tp)) {
41440712Skarels 				splx(s);
41540712Skarels 				return (error);
41640712Skarels 			}
41739407Smarc 			if (com == TIOCSETAF);
41839407Smarc 				ttyflush(tp, FREAD);
41939407Smarc 		}
42040712Skarels 		if ((t->c_cflag&CIGNORE) == 0) {
42135811Smarc 			/*
42235811Smarc 			 * set device hardware
42335811Smarc 			 */
42437584Smarc 			if (tp->t_param && (error = (*tp->t_param)(tp, t))) {
42537584Smarc 				splx(s);
42635811Smarc 				return (error);
42737584Smarc 			} else {
42840712Skarels 				if ((tp->t_state&TS_CARR_ON) == 0 &&
42937584Smarc 				    (tp->t_cflag&CLOCAL) &&
43040712Skarels 				    (t->c_cflag&CLOCAL) == 0) {
43137584Smarc 					tp->t_state &= ~TS_ISOPEN;
43237584Smarc 					tp->t_state |= TS_WOPEN;
43337584Smarc 					ttwakeup(tp);
43437584Smarc 				}
43535811Smarc 				tp->t_cflag = t->c_cflag;
43635811Smarc 				tp->t_ispeed = t->c_ispeed;
43735811Smarc 				tp->t_ospeed = t->c_ospeed;
43834492Skarels 			}
43935811Smarc 			ttsetwater(tp);
44012752Ssam 		}
44139407Smarc 		if (com != TIOCSETAF) {
44235811Smarc 			if ((t->c_lflag&ICANON) != (tp->t_lflag&ICANON))
44335811Smarc 				if (t->c_lflag&ICANON) {
44435811Smarc 					tp->t_lflag |= PENDIN;
44535811Smarc 					ttwakeup(tp);
44635811Smarc 				}
44735811Smarc 				else {
44835811Smarc 					struct clist tq;
44935811Smarc 
45035811Smarc 					catq(&tp->t_rawq, &tp->t_canq);
45135811Smarc 					tq = tp->t_rawq;
45235811Smarc 					tp->t_rawq = tp->t_canq;
45335811Smarc 					tp->t_canq = tq;
45435811Smarc 				}
45512752Ssam 		}
45635811Smarc 		tp->t_iflag = t->c_iflag;
45735811Smarc 		tp->t_oflag = t->c_oflag;
45842882Smarc 		/*
45942882Smarc 		 * Make the EXTPROC bit read only.
46042882Smarc 		 */
46142882Smarc 		if (tp->t_lflag&EXTPROC)
46242882Smarc 			t->c_lflag |= EXTPROC;
46342882Smarc 		else
46442882Smarc 			t->c_lflag &= ~EXTPROC;
46535811Smarc 		tp->t_lflag = t->c_lflag;
46635811Smarc 		bcopy(t->c_cc, tp->t_cc, sizeof(t->c_cc));
46712752Ssam 		splx(s);
46812752Ssam 		break;
46912752Ssam 	}
47012752Ssam 
47112752Ssam 	/*
47239555Smarc 	 * Set controlling terminal.
47339555Smarc 	 * Session ctty vnode pointer set in vnode layer.
47434492Skarels 	 */
47535811Smarc 	case TIOCSCTTY: {
47635811Smarc 		register struct proc *p = u.u_procp;
47734492Skarels 
47839555Smarc 		if (!SESS_LEADER(p) ||
47939555Smarc 		   (p->p_session->s_ttyvp || tp->t_session) &&
48039555Smarc 		   (tp->t_session != p->p_session))
48139407Smarc 			return (EPERM);
48235811Smarc 		tp->t_session = p->p_session;
48339555Smarc 		tp->t_pgrp = p->p_pgrp;
48439555Smarc 		p->p_session->s_ttyp = tp;
48539555Smarc 		p->p_flag |= SCTTY;
48634492Skarels 		break;
48735811Smarc 	}
48839555Smarc 
48934492Skarels 	/*
49035811Smarc 	 * Set terminal process group.
49117545Skarels 	 */
49218650Sbloom 	case TIOCSPGRP: {
49335811Smarc 		register struct proc *p = u.u_procp;
49435811Smarc 		register struct pgrp *pgrp = pgfind(*(int *)data);
49517545Skarels 
49639555Smarc 		if (!isctty(p, tp))
49739555Smarc 			return (ENOTTY);
49840030Smarc 		else if (pgrp == NULL || pgrp->pg_session != p->p_session)
49939555Smarc 			return (EPERM);
50039555Smarc 		tp->t_pgrp = pgrp;
50112752Ssam 		break;
50218650Sbloom 	}
50312752Ssam 
50412752Ssam 	case TIOCGPGRP:
50539555Smarc 		if (!isctty(u.u_procp, tp))
50639555Smarc 			return (ENOTTY);
50739555Smarc 		*(int *)data = tp->t_pgrp ? tp->t_pgrp->pg_id : 0;
50812752Ssam 		break;
50912752Ssam 
51017598Sbloom 	case TIOCSWINSZ:
51118650Sbloom 		if (bcmp((caddr_t)&tp->t_winsize, data,
51218650Sbloom 		    sizeof (struct winsize))) {
51317598Sbloom 			tp->t_winsize = *(struct winsize *)data;
51442882Smarc 			pgsignal(tp->t_pgrp, SIGWINCH, 1);
51517598Sbloom 		}
51617598Sbloom 		break;
51717598Sbloom 
51817598Sbloom 	case TIOCGWINSZ:
51917598Sbloom 		*(struct winsize *)data = tp->t_winsize;
52017598Sbloom 		break;
52117598Sbloom 
52230534Skarels 	case TIOCCONS:
52330534Skarels 		if (*(int *)data) {
52442141Smckusick 			if (constty && constty != tp &&
52542141Smckusick 			    (constty->t_state & (TS_CARR_ON|TS_ISOPEN)) ==
52642141Smckusick 			    (TS_CARR_ON|TS_ISOPEN))
52730534Skarels 				return (EBUSY);
52830534Skarels #ifndef	UCONSOLE
52937554Smckusick 			if (error = suser(u.u_cred, &u.u_acflag))
53037554Smckusick 				return (error);
53130534Skarels #endif
53230534Skarels 			constty = tp;
53330534Skarels 		} else if (tp == constty)
53433404Skarels 			constty = NULL;
53530534Skarels 		break;
53630534Skarels 
53735811Smarc #ifdef COMPAT_43
53835811Smarc 	case TIOCGETP:
53935811Smarc 	case TIOCSETP:
54035811Smarc 	case TIOCSETN:
54135811Smarc 	case TIOCGETC:
54235811Smarc 	case TIOCSETC:
54335811Smarc 	case TIOCSLTC:
54435811Smarc 	case TIOCGLTC:
54535811Smarc 	case TIOCLBIS:
54635811Smarc 	case TIOCLBIC:
54735811Smarc 	case TIOCLSET:
54835811Smarc 	case TIOCLGET:
54939407Smarc 	case OTIOCGETD:
55039407Smarc 	case OTIOCSETD:
55135811Smarc 		return(ttcompat(tp, com, data, flag));
55235811Smarc #endif
55335811Smarc 
55439Sbill 	default:
5558556Sroot 		return (-1);
55639Sbill 	}
5578556Sroot 	return (0);
55839Sbill }
5594484Swnj 
5604484Swnj ttnread(tp)
5614484Swnj 	struct tty *tp;
5624484Swnj {
5634484Swnj 	int nread = 0;
5644484Swnj 
56535811Smarc 	if (tp->t_lflag & PENDIN)
5664484Swnj 		ttypend(tp);
5674484Swnj 	nread = tp->t_canq.c_cc;
56835811Smarc 	if ((tp->t_lflag & ICANON) == 0)
5694484Swnj 		nread += tp->t_rawq.c_cc;
5704484Swnj 	return (nread);
5714484Swnj }
5724484Swnj 
5735408Swnj ttselect(dev, rw)
5744484Swnj 	dev_t dev;
5755408Swnj 	int rw;
5764484Swnj {
5774484Swnj 	register struct tty *tp = &cdevsw[major(dev)].d_ttys[minor(dev)];
5784484Swnj 	int nread;
57917545Skarels 	int s = spltty();
5804484Swnj 
5815408Swnj 	switch (rw) {
5824484Swnj 
5834484Swnj 	case FREAD:
5844484Swnj 		nread = ttnread(tp);
58537584Smarc 		if (nread > 0 ||
58640712Skarels 		   ((tp->t_cflag&CLOCAL) == 0 && (tp->t_state&TS_CARR_ON) == 0))
5875408Swnj 			goto win;
5884938Swnj 		if (tp->t_rsel && tp->t_rsel->p_wchan == (caddr_t)&selwait)
5895408Swnj 			tp->t_state |= TS_RCOLL;
5904484Swnj 		else
5914484Swnj 			tp->t_rsel = u.u_procp;
5925408Swnj 		break;
5934484Swnj 
5945408Swnj 	case FWRITE:
59535811Smarc 		if (tp->t_outq.c_cc <= tp->t_lowat)
5965408Swnj 			goto win;
5975408Swnj 		if (tp->t_wsel && tp->t_wsel->p_wchan == (caddr_t)&selwait)
5985408Swnj 			tp->t_state |= TS_WCOLL;
5995408Swnj 		else
6005408Swnj 			tp->t_wsel = u.u_procp;
6015408Swnj 		break;
6024484Swnj 	}
6035408Swnj 	splx(s);
6045408Swnj 	return (0);
6055408Swnj win:
6065408Swnj 	splx(s);
6075408Swnj 	return (1);
6084484Swnj }
6097436Skre 
6107502Sroot /*
61125391Skarels  * Initial open of tty, or (re)entry to line discipline.
6127502Sroot  */
6137502Sroot ttyopen(dev, tp)
6147625Ssam 	dev_t dev;
6157625Ssam 	register struct tty *tp;
6167502Sroot {
6177502Sroot 
6187502Sroot 	tp->t_dev = dev;
61935811Smarc 
62043092Smarc 	if (ttclosed(tp))	/* XXX is this still needed? (drivers do it) */
62143092Smarc 		return (ERESTART);
6227502Sroot 	tp->t_state &= ~TS_WOPEN;
62317545Skarels 	if ((tp->t_state & TS_ISOPEN) == 0) {
62417545Skarels 		tp->t_state |= TS_ISOPEN;
62517598Sbloom 		bzero((caddr_t)&tp->t_winsize, sizeof(tp->t_winsize));
62617545Skarels 	}
6278556Sroot 	return (0);
6287502Sroot }
6297502Sroot 
6307502Sroot /*
63125391Skarels  * "close" a line discipline
63225391Skarels  */
63325391Skarels ttylclose(tp)
63425391Skarels 	register struct tty *tp;
63525391Skarels {
63625391Skarels 
63725391Skarels 	ttywflush(tp);
63825391Skarels }
63925391Skarels 
64025391Skarels /*
6417502Sroot  * clean tp on last close
6427502Sroot  */
6437502Sroot ttyclose(tp)
6447625Ssam 	register struct tty *tp;
6457502Sroot {
64630534Skarels 	if (constty == tp)
64730534Skarels 		constty = NULL;
64825391Skarels 	ttyflush(tp, FREAD|FWRITE);
64939555Smarc 	tp->t_session = NULL;
65039555Smarc 	tp->t_pgrp = NULL;
6517502Sroot 	tp->t_state = 0;
65240712Skarels 	return (0);
6537502Sroot }
6547502Sroot 
6557502Sroot /*
65625391Skarels  * Handle modem control transition on a tty.
65725391Skarels  * Flag indicates new state of carrier.
65825391Skarels  * Returns 0 if the line should be turned off, otherwise 1.
65925391Skarels  */
66025391Skarels ttymodem(tp, flag)
66125391Skarels 	register struct tty *tp;
66225391Skarels {
66325391Skarels 
66442193Smarc 	if ((tp->t_state&TS_WOPEN) == 0 && (tp->t_lflag&MDMBUF)) {
66525391Skarels 		/*
66625391Skarels 		 * MDMBUF: do flow control according to carrier flag
66725391Skarels 		 */
66825391Skarels 		if (flag) {
66925391Skarels 			tp->t_state &= ~TS_TTSTOP;
67025391Skarels 			ttstart(tp);
67125391Skarels 		} else if ((tp->t_state&TS_TTSTOP) == 0) {
67225391Skarels 			tp->t_state |= TS_TTSTOP;
67325391Skarels 			(*cdevsw[major(tp->t_dev)].d_stop)(tp, 0);
67425391Skarels 		}
67525391Skarels 	} else if (flag == 0) {
67625391Skarels 		/*
67725391Skarels 		 * Lost carrier.
67825391Skarels 		 */
67925391Skarels 		tp->t_state &= ~TS_CARR_ON;
68042193Smarc 		if (tp->t_state&TS_ISOPEN && (tp->t_cflag&CLOCAL) == 0) {
68142193Smarc 			if (tp->t_session && tp->t_session->s_leader)
68242193Smarc 				psignal(tp->t_session->s_leader, SIGHUP);
68342193Smarc 			ttyflush(tp, FREAD|FWRITE);
68442193Smarc 			return (0);
68525391Skarels 		}
68625391Skarels 	} else {
68725391Skarels 		/*
68825391Skarels 		 * Carrier now on.
68925391Skarels 		 */
69025391Skarels 		tp->t_state |= TS_CARR_ON;
69137584Smarc 		ttwakeup(tp);
69225391Skarels 	}
69325391Skarels 	return (1);
69425391Skarels }
69525391Skarels 
69625391Skarels /*
69725404Skarels  * Default modem control routine (for other line disciplines).
69825404Skarels  * Return argument flag, to turn off device on carrier drop.
69925404Skarels  */
70025415Skarels nullmodem(tp, flag)
70125415Skarels 	register struct tty *tp;
70225404Skarels 	int flag;
70325404Skarels {
70425404Skarels 
70525404Skarels 	if (flag)
70625404Skarels 		tp->t_state |= TS_CARR_ON;
70739407Smarc 	else {
70825404Skarels 		tp->t_state &= ~TS_CARR_ON;
70942193Smarc 		if ((tp->t_cflag&CLOCAL) == 0) {
71042193Smarc 			if (tp->t_session && tp->t_session->s_leader)
71142193Smarc 				psignal(tp->t_session->s_leader, SIGHUP);
71242193Smarc 			return (0);
71342193Smarc 		}
71439407Smarc 	}
71542193Smarc 	return (1);
71625404Skarels }
71725404Skarels 
71825404Skarels /*
7197502Sroot  * reinput pending characters after state switch
72017545Skarels  * call at spltty().
7217502Sroot  */
7227502Sroot ttypend(tp)
7237625Ssam 	register struct tty *tp;
7247502Sroot {
7257502Sroot 	struct clist tq;
7267502Sroot 	register c;
7277502Sroot 
72835811Smarc 	tp->t_lflag &= ~PENDIN;
7299578Ssam 	tp->t_state |= TS_TYPEN;
7307502Sroot 	tq = tp->t_rawq;
7317502Sroot 	tp->t_rawq.c_cc = 0;
7327502Sroot 	tp->t_rawq.c_cf = tp->t_rawq.c_cl = 0;
7337502Sroot 	while ((c = getc(&tq)) >= 0)
7347502Sroot 		ttyinput(c, tp);
7359578Ssam 	tp->t_state &= ~TS_TYPEN;
7367502Sroot }
7377502Sroot 
7387502Sroot /*
73935811Smarc  *
7409578Ssam  * Place a character on raw TTY input queue,
7419578Ssam  * putting in delimiters and waking up top
7429578Ssam  * half as needed.  Also echo if required.
7439578Ssam  * The arguments are the character and the
7449578Ssam  * appropriate tty structure.
7457502Sroot  */
7467502Sroot ttyinput(c, tp)
7477625Ssam 	register c;
7487625Ssam 	register struct tty *tp;
7497502Sroot {
75035811Smarc 	register int iflag = tp->t_iflag;
75135811Smarc 	register int lflag = tp->t_lflag;
75235811Smarc 	register u_char *cc = tp->t_cc;
75335811Smarc 	int i, err;
7547502Sroot 
7559578Ssam 	/*
7569578Ssam 	 * If input is pending take it first.
7579578Ssam 	 */
75835811Smarc 	if (lflag&PENDIN)
7597502Sroot 		ttypend(tp);
76035811Smarc 	/*
76135811Smarc 	 * Gather stats.
76235811Smarc 	 */
7637502Sroot 	tk_nin++;
76435811Smarc 	if (lflag&ICANON) {
76535811Smarc 		tk_cancc++;
76635811Smarc 		tp->t_cancc++;
76735811Smarc 	} else {
76835811Smarc 		tk_rawcc++;
76935811Smarc 		tp->t_rawcc++;
77035811Smarc 	}
7719578Ssam 	/*
77235811Smarc 	 * Handle exceptional conditions (break, parity, framing).
7739578Ssam 	 */
77435811Smarc 	if (err = (c&TTY_ERRORMASK)) {
77535811Smarc 		c &= ~TTY_ERRORMASK;
77635811Smarc 		if (err&TTY_FE && !c) {		/* break */
77735811Smarc 			if (iflag&IGNBRK)
77835811Smarc 				goto endcase;
77935811Smarc 			else if (iflag&BRKINT && lflag&ISIG &&
78035811Smarc 				(cc[VINTR] != _POSIX_VDISABLE))
78135811Smarc 				c = cc[VINTR];
78235811Smarc 			else {
78335811Smarc 				c = 0;
78435811Smarc 				if (iflag&PARMRK)
78535811Smarc 					goto parmrk;
78635811Smarc 			}
78735811Smarc 		} else if ((err&TTY_PE && iflag&INPCK) || err&TTY_FE) {
78835811Smarc 			if (iflag&IGNPAR)
78935811Smarc 				goto endcase;
79035811Smarc 			else if (iflag&PARMRK) {
79135811Smarc parmrk:
79235811Smarc 				putc(0377|TTY_QUOTE, &tp->t_rawq);
79335811Smarc 				putc(0|TTY_QUOTE, &tp->t_rawq);
79435811Smarc 				putc(c|TTY_QUOTE, &tp->t_rawq);
79535811Smarc 				goto endcase;
79635811Smarc 			} else
79735811Smarc 				c = 0;
7987502Sroot 		}
7999578Ssam 	}
8009578Ssam 	/*
80135811Smarc 	 * In tandem mode, check high water mark.
8029578Ssam 	 */
80335811Smarc 	if (iflag&IXOFF)
80435811Smarc 		ttyblock(tp);
80535811Smarc 	if ((tp->t_state&TS_TYPEN) == 0 && (iflag&ISTRIP))
8069578Ssam 		c &= 0177;
80742882Smarc     if ((tp->t_lflag&EXTPROC) == 0) {
8089578Ssam 	/*
8099578Ssam 	 * Check for literal nexting very first
8109578Ssam 	 */
8119578Ssam 	if (tp->t_state&TS_LNCH) {
81235811Smarc 		c |= TTY_QUOTE;
8139578Ssam 		tp->t_state &= ~TS_LNCH;
8149578Ssam 	}
8159578Ssam 	/*
8169578Ssam 	 * Scan for special characters.  This code
8179578Ssam 	 * is really just a big case statement with
8189578Ssam 	 * non-constant cases.  The bottom of the
8199578Ssam 	 * case statement is labeled ``endcase'', so goto
8209578Ssam 	 * it after a case match, or similar.
8219578Ssam 	 */
82235811Smarc 	/*
82335811Smarc 	 * Control chars which aren't controlled
82435811Smarc 	 * by ICANON, ISIG, or IXON.
82535811Smarc 	 */
82639407Smarc 	if (lflag&IEXTEN) {
82740712Skarels 		if (CCEQ(cc[VLNEXT], c)) {
82835811Smarc 			if (lflag&ECHO) {
82935811Smarc 				if (lflag&ECHOE)
83040712Skarels 					ttyoutstr("^\b", tp);
83135811Smarc 				else
83235811Smarc 					ttyecho(c, tp);
83335811Smarc 			}
8349578Ssam 			tp->t_state |= TS_LNCH;
8359578Ssam 			goto endcase;
8369578Ssam 		}
837*43093Smarc 		if (CCEQ(cc[VDISCARD], c)) {
83835811Smarc 			if (lflag&FLUSHO)
83935811Smarc 				tp->t_lflag &= ~FLUSHO;
8407502Sroot 			else {
84112752Ssam 				ttyflush(tp, FWRITE);
8427502Sroot 				ttyecho(c, tp);
8439578Ssam 				if (tp->t_rawq.c_cc + tp->t_canq.c_cc)
8447502Sroot 					ttyretype(tp);
84535811Smarc 				tp->t_lflag |= FLUSHO;
8467502Sroot 			}
8479578Ssam 			goto startoutput;
8489578Ssam 		}
84935811Smarc 	}
85035811Smarc 	/*
85135811Smarc 	 * Signals.
85235811Smarc 	 */
85335811Smarc 	if (lflag&ISIG) {
85435811Smarc 		if (CCEQ(cc[VINTR], c) || CCEQ(cc[VQUIT], c)) {
85535811Smarc 			if ((lflag&NOFLSH) == 0)
85635811Smarc 				ttyflush(tp, FREAD|FWRITE);
85735811Smarc 			ttyecho(c, tp);
85839555Smarc 			pgsignal(tp->t_pgrp,
85942882Smarc 			    CCEQ(cc[VINTR], c) ? SIGINT : SIGQUIT, 1);
86035811Smarc 			goto endcase;
86135811Smarc 		}
86240712Skarels 		if (CCEQ(cc[VSUSP], c)) {
86335811Smarc 			if ((lflag&NOFLSH) == 0)
86412752Ssam 				ttyflush(tp, FREAD);
8659578Ssam 			ttyecho(c, tp);
86642882Smarc 			pgsignal(tp->t_pgrp, SIGTSTP, 1);
8679578Ssam 			goto endcase;
8689578Ssam 		}
8699578Ssam 	}
8709578Ssam 	/*
8719578Ssam 	 * Handle start/stop characters.
8729578Ssam 	 */
87335811Smarc 	if (iflag&IXON) {
87440712Skarels 		if (CCEQ(cc[VSTOP], c)) {
87535811Smarc 			if ((tp->t_state&TS_TTSTOP) == 0) {
87635811Smarc 				tp->t_state |= TS_TTSTOP;
87735811Smarc 				(*cdevsw[major(tp->t_dev)].d_stop)(tp, 0);
87835811Smarc 				return;
87935811Smarc 			}
88035811Smarc 			if (!CCEQ(cc[VSTART], c))
88135811Smarc 				return;
88235811Smarc 			/*
88335811Smarc 			 * if VSTART == VSTOP then toggle
88435811Smarc 			 */
88535811Smarc 			goto endcase;
8869578Ssam 		}
88735811Smarc 		if (CCEQ(cc[VSTART], c))
88835811Smarc 			goto restartoutput;
8899578Ssam 	}
8909578Ssam 	/*
89135811Smarc 	 * IGNCR, ICRNL, & INLCR
8929578Ssam 	 */
89335811Smarc 	if (c == '\r') {
89435811Smarc 		if (iflag&IGNCR)
89535811Smarc 			goto endcase;
89635811Smarc 		else if (iflag&ICRNL)
89735811Smarc 			c = '\n';
8989578Ssam 	}
89935811Smarc 	else if (c == '\n' && iflag&INLCR)
90035811Smarc 		c = '\r';
90142882Smarc     }
9029578Ssam 	/*
90335811Smarc 	 * Non canonical mode; don't process line editing
9049578Ssam 	 * characters; check high water mark for wakeup.
90535811Smarc 	 *
9069578Ssam 	 */
90740712Skarels 	if ((lflag&ICANON) == 0) {
9089578Ssam 		if (tp->t_rawq.c_cc > TTYHOG) {
90935811Smarc 			if (iflag&IMAXBEL) {
91035811Smarc 				if (tp->t_outq.c_cc < tp->t_hiwat)
91135811Smarc 					(void) ttyoutput(CTRL('g'), tp);
91235811Smarc 			} else
91335811Smarc 				ttyflush(tp, FREAD | FWRITE);
91435811Smarc 		} else {
91535811Smarc 			if (putc(c, &tp->t_rawq) >= 0) {
91635811Smarc 				ttwakeup(tp);
91735811Smarc 				ttyecho(c, tp);
91835811Smarc 			}
9197502Sroot 		}
9209578Ssam 		goto endcase;
9219578Ssam 	}
92242882Smarc     if ((tp->t_lflag&EXTPROC) == 0) {
9239578Ssam 	/*
92435811Smarc 	 * From here on down canonical mode character
9259578Ssam 	 * processing takes place.
9269578Ssam 	 */
92735811Smarc 	/*
92835811Smarc 	 * erase (^H / ^?)
92935811Smarc 	 */
93039407Smarc 	if (CCEQ(cc[VERASE], c)) {
9319578Ssam 		if (tp->t_rawq.c_cc)
9329578Ssam 			ttyrub(unputc(&tp->t_rawq), tp);
9339578Ssam 		goto endcase;
9349578Ssam 	}
93535811Smarc 	/*
93635811Smarc 	 * kill (^U)
93735811Smarc 	 */
93835811Smarc 	if (CCEQ(cc[VKILL], c)) {
93937584Smarc 		if (lflag&ECHOKE && tp->t_rawq.c_cc == tp->t_rocount &&
94040712Skarels 		    (lflag&ECHOPRT) == 0) {
9419578Ssam 			while (tp->t_rawq.c_cc)
9429578Ssam 				ttyrub(unputc(&tp->t_rawq), tp);
9439578Ssam 		} else {
9449578Ssam 			ttyecho(c, tp);
94535811Smarc 			if (lflag&ECHOK || lflag&ECHOKE)
94635811Smarc 				ttyecho('\n', tp);
9479578Ssam 			while (getc(&tp->t_rawq) > 0)
9489578Ssam 				;
9499578Ssam 			tp->t_rocount = 0;
9509578Ssam 		}
9519578Ssam 		tp->t_state &= ~TS_LOCAL;
9529578Ssam 		goto endcase;
9539578Ssam 	}
9549578Ssam 	/*
95535811Smarc 	 * word erase (^W)
9569578Ssam 	 */
95735811Smarc 	if (CCEQ(cc[VWERASE], c)) {
95835811Smarc 		int ctype;
95935811Smarc 
96035811Smarc #define CTYPE(c) ((lflag&ALTWERASE) ? (partab[(c)&TTY_CHARMASK]&0100) : 0)
96135811Smarc 		/*
96235811Smarc 		 * erase whitespace
96335811Smarc 		 */
96435811Smarc 		while ((c = unputc(&tp->t_rawq)) == ' ' || c == '\t')
96535811Smarc 			ttyrub(c, tp);
96635811Smarc 		if (c == -1)
96734492Skarels 			goto endcase;
96835811Smarc 		/*
96935811Smarc 		 * special case last char of token
97035811Smarc 		 */
97135811Smarc 		ttyrub(c, tp);
97235811Smarc 		c = unputc(&tp->t_rawq);
97335811Smarc 		if (c == -1 || c == ' ' || c == '\t') {
97435811Smarc 			if (c != -1)
97535811Smarc 				(void) putc(c, &tp->t_rawq);
97634492Skarels 			goto endcase;
97734492Skarels 		}
97835811Smarc 		/*
97935811Smarc 		 * erase rest of token
98035811Smarc 		 */
98135811Smarc 		ctype = CTYPE(c);
98235811Smarc 		do {
98335811Smarc 			ttyrub(c, tp);
98435811Smarc 			c = unputc(&tp->t_rawq);
98535811Smarc 			if (c == -1)
98635811Smarc 				goto endcase;
98735811Smarc 		} while (c != ' ' && c != '\t' && CTYPE(c) == ctype);
98835811Smarc 		(void) putc(c, &tp->t_rawq);
98935811Smarc 		goto endcase;
99035811Smarc #undef CTYPE
9919578Ssam 	}
9929578Ssam 	/*
99335811Smarc 	 * reprint line (^R)
99435811Smarc 	 */
99535811Smarc 	if (CCEQ(cc[VREPRINT], c)) {
99635811Smarc 		ttyretype(tp);
99735811Smarc 		goto endcase;
99835811Smarc 	}
99942141Smckusick 	if (CCEQ(cc[VINFO], c)) {
100042882Smarc 		pgsignal(tp->t_pgrp, SIGINFO, 1);
100142141Smckusick 		if ((lflag&NOKERNINFO) == 0)
100242141Smckusick 			ttyinfo(tp);
100342141Smckusick 		goto endcase;
100442141Smckusick 	}
100542882Smarc     }
100635811Smarc 	/*
10079578Ssam 	 * Check for input buffer overflow
10089578Ssam 	 */
100910391Ssam 	if (tp->t_rawq.c_cc+tp->t_canq.c_cc >= TTYHOG) {
101035811Smarc 		if (iflag&IMAXBEL) {
101135811Smarc 			if (tp->t_outq.c_cc < tp->t_hiwat)
101235811Smarc 				(void) ttyoutput(CTRL('g'), tp);
101335811Smarc 		} else
101435811Smarc 			ttyflush(tp, FREAD | FWRITE);
10159578Ssam 		goto endcase;
101610391Ssam 	}
10179578Ssam 	/*
10189578Ssam 	 * Put data char in q for user and
10199578Ssam 	 * wakeup on seeing a line delimiter.
10209578Ssam 	 */
10219578Ssam 	if (putc(c, &tp->t_rawq) >= 0) {
102235811Smarc 		if (ttbreakc(c)) {
10239578Ssam 			tp->t_rocount = 0;
10249578Ssam 			catq(&tp->t_rawq, &tp->t_canq);
10257502Sroot 			ttwakeup(tp);
10269578Ssam 		} else if (tp->t_rocount++ == 0)
10279578Ssam 			tp->t_rocol = tp->t_col;
10289578Ssam 		if (tp->t_state&TS_ERASE) {
102935811Smarc 			/*
103035811Smarc 			 * end of prterase \.../
103135811Smarc 			 */
10329578Ssam 			tp->t_state &= ~TS_ERASE;
10339578Ssam 			(void) ttyoutput('/', tp);
10349578Ssam 		}
10359578Ssam 		i = tp->t_col;
10367502Sroot 		ttyecho(c, tp);
103735811Smarc 		if (CCEQ(cc[VEOF], c) && lflag&ECHO) {
103835811Smarc 			/*
103935811Smarc 			 * Place the cursor over the '^' of the ^D.
104035811Smarc 			 */
10419578Ssam 			i = MIN(2, tp->t_col - i);
10429578Ssam 			while (i > 0) {
10439578Ssam 				(void) ttyoutput('\b', tp);
10449578Ssam 				i--;
10459578Ssam 			}
10469578Ssam 		}
10477502Sroot 	}
10489578Ssam endcase:
10499578Ssam 	/*
105035811Smarc 	 * IXANY means allow any character to restart output.
10519578Ssam 	 */
105240712Skarels 	if ((tp->t_state&TS_TTSTOP) && (iflag&IXANY) == 0 &&
105340712Skarels 	    cc[VSTART] != cc[VSTOP])
10547502Sroot 		return;
10559578Ssam restartoutput:
10567502Sroot 	tp->t_state &= ~TS_TTSTOP;
105735811Smarc 	tp->t_lflag &= ~FLUSHO;
10589578Ssam startoutput:
10597502Sroot 	ttstart(tp);
10607502Sroot }
10617502Sroot 
10627502Sroot /*
10639578Ssam  * Put character on TTY output queue, adding delays,
10647502Sroot  * expanding tabs, and handling the CR/NL bit.
10659578Ssam  * This is called both from the top half for output,
10669578Ssam  * and from interrupt level for echoing.
10677502Sroot  * The arguments are the character and the tty structure.
10687502Sroot  * Returns < 0 if putc succeeds, otherwise returns char to resend
10697502Sroot  * Must be recursive.
10707502Sroot  */
10717502Sroot ttyoutput(c, tp)
10727502Sroot 	register c;
10737502Sroot 	register struct tty *tp;
10747502Sroot {
10757502Sroot 	register char *colp;
10767502Sroot 	register ctype;
107735811Smarc 	register long oflag = tp->t_oflag;
107835811Smarc 
107940712Skarels 	if ((oflag&OPOST) == 0) {
108035811Smarc 		if (tp->t_lflag&FLUSHO)
10817502Sroot 			return (-1);
10827502Sroot 		if (putc(c, &tp->t_outq))
10837625Ssam 			return (c);
10847502Sroot 		tk_nout++;
108535811Smarc 		tp->t_outcc++;
10867502Sroot 		return (-1);
10877502Sroot 	}
108835811Smarc 	c &= TTY_CHARMASK;
10897502Sroot 	/*
10907502Sroot 	 * Turn tabs to spaces as required
109142882Smarc 	 *
109242882Smarc 	 * Special case if we have external processing, we don't
109342882Smarc 	 * do the tab expansion because we'll probably get it
109442882Smarc 	 * wrong.  If tab expansion needs to be done, let it
109542882Smarc 	 * happen externally.
10967502Sroot 	 */
109742882Smarc 	if ((tp->t_lflag&EXTPROC) == 0 &&
109842882Smarc 	    c == '\t' && oflag&OXTABS ) {
10997502Sroot 		register int s;
11007502Sroot 
11017502Sroot 		c = 8 - (tp->t_col&7);
110235811Smarc 		if ((tp->t_lflag&FLUSHO) == 0) {
110317545Skarels 			s = spltty();		/* don't interrupt tabs */
11047502Sroot 			c -= b_to_q("        ", c, &tp->t_outq);
11057502Sroot 			tk_nout += c;
110635811Smarc 			tp->t_outcc += c;
11077502Sroot 			splx(s);
11087502Sroot 		}
11097502Sroot 		tp->t_col += c;
11107502Sroot 		return (c ? -1 : '\t');
11117502Sroot 	}
111235811Smarc 	if (c == CEOT && oflag&ONOEOT)
111335811Smarc 		return(-1);
11147502Sroot 	tk_nout++;
111535811Smarc 	tp->t_outcc++;
11167502Sroot 	/*
11177502Sroot 	 * turn <nl> to <cr><lf> if desired.
11187502Sroot 	 */
111935811Smarc 	if (c == '\n' && (tp->t_oflag&ONLCR) && ttyoutput('\r', tp) >= 0)
11207502Sroot 		return (c);
112135811Smarc 	if ((tp->t_lflag&FLUSHO) == 0 && putc(c, &tp->t_outq))
112235811Smarc 		return (c);
11237502Sroot 	/*
11247502Sroot 	 * Calculate delays.
11257502Sroot 	 * The numbers here represent clock ticks
11267502Sroot 	 * and are not necessarily optimal for all terminals.
11279578Ssam 	 *
11289578Ssam 	 * SHOULD JUST ALLOW USER TO SPECIFY DELAYS
112935811Smarc 	 *
113035811Smarc 	 * (actually, should THROW AWAY terminals which need delays)
11317502Sroot 	 */
11327502Sroot 	colp = &tp->t_col;
11337502Sroot 	ctype = partab[c];
11347502Sroot 	c = 0;
11357502Sroot 	switch (ctype&077) {
11367502Sroot 
11377502Sroot 	case ORDINARY:
11387502Sroot 		(*colp)++;
11397502Sroot 
11407502Sroot 	case CONTROL:
11417502Sroot 		break;
11427502Sroot 
11437502Sroot 	case BACKSPACE:
11447502Sroot 		if (*colp)
11457502Sroot 			(*colp)--;
11467502Sroot 		break;
11477502Sroot 
114813821Ssam 	/*
114913821Ssam 	 * This macro is close enough to the correct thing;
115013821Ssam 	 * it should be replaced by real user settable delays
115113821Ssam 	 * in any event...
115213821Ssam 	 */
115313821Ssam #define	mstohz(ms)	(((ms) * hz) >> 10)
11547502Sroot 	case NEWLINE:
11557502Sroot 		ctype = (tp->t_flags >> 8) & 03;
11567625Ssam 		if (ctype == 1) { /* tty 37 */
115726357Skarels 			if (*colp > 0) {
115826357Skarels 				c = (((unsigned)*colp) >> 4) + 3;
115926357Skarels 				if ((unsigned)c > 6)
116026357Skarels 					c = 6;
116126357Skarels 			}
11629578Ssam 		} else if (ctype == 2) /* vt05 */
116313821Ssam 			c = mstohz(100);
11647502Sroot 		*colp = 0;
11657502Sroot 		break;
11667502Sroot 
11677502Sroot 	case TAB:
11687502Sroot 		ctype = (tp->t_flags >> 10) & 03;
11697625Ssam 		if (ctype == 1) { /* tty 37 */
11707502Sroot 			c = 1 - (*colp | ~07);
11717625Ssam 			if (c < 5)
11727502Sroot 				c = 0;
11737502Sroot 		}
11747502Sroot 		*colp |= 07;
11757502Sroot 		(*colp)++;
11767502Sroot 		break;
11777502Sroot 
11787502Sroot 	case VTAB:
11799578Ssam 		if (tp->t_flags&VTDELAY) /* tty 37 */
11807502Sroot 			c = 0177;
11817502Sroot 		break;
11827502Sroot 
11837502Sroot 	case RETURN:
11847502Sroot 		ctype = (tp->t_flags >> 12) & 03;
11859578Ssam 		if (ctype == 1) /* tn 300 */
118613821Ssam 			c = mstohz(83);
11879578Ssam 		else if (ctype == 2) /* ti 700 */
118813821Ssam 			c = mstohz(166);
11899578Ssam 		else if (ctype == 3) { /* concept 100 */
11907502Sroot 			int i;
11919578Ssam 
11927502Sroot 			if ((i = *colp) >= 0)
11939578Ssam 				for (; i < 9; i++)
11947502Sroot 					(void) putc(0177, &tp->t_outq);
11957502Sroot 		}
11967502Sroot 		*colp = 0;
11977502Sroot 	}
119835811Smarc 	if (c && (tp->t_lflag&FLUSHO) == 0)
119935811Smarc 		(void) putc(c|TTY_QUOTE, &tp->t_outq);
12007502Sroot 	return (-1);
12017502Sroot }
120213821Ssam #undef mstohz
12037502Sroot 
12047502Sroot /*
12057502Sroot  * Called from device's read routine after it has
12067502Sroot  * calculated the tty-structure given as argument.
12077502Sroot  */
120837584Smarc ttread(tp, uio, flag)
12097625Ssam 	register struct tty *tp;
12107722Swnj 	struct uio *uio;
12117502Sroot {
12127502Sroot 	register struct clist *qp;
121335811Smarc 	register int c;
121441383Smarc 	register long lflag;
121535811Smarc 	register u_char *cc = tp->t_cc;
12169859Ssam 	int s, first, error = 0;
12177502Sroot 
12187502Sroot loop:
121941383Smarc 	lflag = tp->t_lflag;
122037584Smarc 	s = spltty();
12219578Ssam 	/*
122237584Smarc 	 * take pending input first
12239578Ssam 	 */
122435811Smarc 	if (lflag&PENDIN)
12257502Sroot 		ttypend(tp);
12269859Ssam 	splx(s);
122740712Skarels 
12289578Ssam 	/*
12299578Ssam 	 * Hang process if it's in the background.
12309578Ssam 	 */
123139555Smarc 	if (isbackground(u.u_procp, tp)) {
123224392Skarels 		if ((u.u_procp->p_sigignore & sigmask(SIGTTIN)) ||
123324392Skarels 		   (u.u_procp->p_sigmask & sigmask(SIGTTIN)) ||
123435811Smarc 		    u.u_procp->p_flag&SVFORK || u.u_procp->p_pgrp->pg_jobc == 0)
12358520Sroot 			return (EIO);
123642882Smarc 		pgsignal(u.u_procp->p_pgrp, SIGTTIN, 1);
123743092Smarc 		if ((error = tsleep((caddr_t)&lbolt, TTIPRI | PCATCH,
123843092Smarc 				    ttybg, 0)) ||
123943092Smarc 		    (error = ttclosed(tp)))
124040712Skarels 			return (error);
124123165Sbloom 		goto loop;
12427502Sroot 	}
124340712Skarels 
12449578Ssam 	/*
124535811Smarc 	 * If canonical, use the canonical queue,
124635811Smarc 	 * else use the raw queue.
124737584Smarc 	 *
124837584Smarc 	 * XXX - should get rid of canonical queue.
124937584Smarc 	 * (actually, should get rid of clists...)
12509578Ssam 	 */
125135811Smarc 	qp = lflag&ICANON ? &tp->t_canq : &tp->t_rawq;
125240712Skarels 
12539578Ssam 	/*
125440712Skarels 	 * If there is no input, sleep on rawq
125540712Skarels 	 * awaiting hardware receipt and notification.
125640712Skarels 	 * If we have data, we don't need to check for carrier.
12579578Ssam 	 */
125817545Skarels 	s = spltty();
12599578Ssam 	if (qp->c_cc <= 0) {
126040712Skarels 		int carrier;
126140712Skarels 
126240712Skarels 		carrier = (tp->t_state&TS_CARR_ON) || (tp->t_cflag&CLOCAL);
126340712Skarels 		if (!carrier && tp->t_state&TS_ISOPEN) {
12649859Ssam 			splx(s);
126540712Skarels 			return (0);	/* EOF */
12667502Sroot 		}
126737728Smckusick 		if (flag & IO_NDELAY) {
126837584Smarc 			splx(s);
126937584Smarc 			return (EWOULDBLOCK);
127037584Smarc 		}
127140712Skarels 		error = tsleep((caddr_t)&tp->t_rawq, TTIPRI | PCATCH,
127240712Skarels 		    carrier ? ttyin : ttopen, 0);
12739859Ssam 		splx(s);
127443092Smarc 		if (error || (error = ttclosed(tp)))
127540712Skarels 			return (error);
12769578Ssam 		goto loop;
12779578Ssam 	}
12789859Ssam 	splx(s);
127940712Skarels 
12809578Ssam 	/*
128135811Smarc 	 * Input present, check for input mapping and processing.
12829578Ssam 	 */
12839578Ssam 	first = 1;
12849578Ssam 	while ((c = getc(qp)) >= 0) {
12859578Ssam 		/*
128635811Smarc 		 * delayed suspend (^Y)
12879578Ssam 		 */
128835811Smarc 		if (CCEQ(cc[VDSUSP], c) && lflag&ISIG) {
128942882Smarc 			pgsignal(tp->t_pgrp, SIGTSTP, 1);
12909578Ssam 			if (first) {
129143092Smarc 				if ((error = tsleep((caddr_t)&lbolt,
129243092Smarc 					    TTIPRI | PCATCH, ttybg, 0)) ||
129343092Smarc 				    (error = ttclosed(tp)))
129440712Skarels 					break;
12959578Ssam 				goto loop;
12969578Ssam 			}
12979578Ssam 			break;
12987502Sroot 		}
12999578Ssam 		/*
130035811Smarc 		 * Interpret EOF only in canonical mode.
13019578Ssam 		 */
130235811Smarc 		if (CCEQ(cc[VEOF], c) && lflag&ICANON)
13039578Ssam 			break;
13049578Ssam 		/*
13059578Ssam 		 * Give user character.
13069578Ssam 		 */
130740712Skarels  		error = ureadc(c, uio);
13089578Ssam 		if (error)
13099578Ssam 			break;
131014938Smckusick  		if (uio->uio_resid == 0)
13119578Ssam 			break;
13129578Ssam 		/*
131335811Smarc 		 * In canonical mode check for a "break character"
13149578Ssam 		 * marking the end of a "line of input".
13159578Ssam 		 */
131640712Skarels 		if (lflag&ICANON && ttbreakc(c))
13179578Ssam 			break;
13189578Ssam 		first = 0;
13197502Sroot 	}
13209578Ssam 	/*
13219578Ssam 	 * Look to unblock output now that (presumably)
13229578Ssam 	 * the input queue has gone down.
13239578Ssam 	 */
132435811Smarc 	if (tp->t_state&TS_TBLOCK && tp->t_rawq.c_cc < TTYHOG/5) {
132535811Smarc 		if (cc[VSTART] != _POSIX_VDISABLE
132635811Smarc 		   && putc(cc[VSTART], &tp->t_outq) == 0) {
13277502Sroot 			tp->t_state &= ~TS_TBLOCK;
13287502Sroot 			ttstart(tp);
13297502Sroot 		}
133035811Smarc 	}
13318520Sroot 	return (error);
13327502Sroot }
13337502Sroot 
13347502Sroot /*
133525391Skarels  * Check the output queue on tp for space for a kernel message
133625391Skarels  * (from uprintf/tprintf).  Allow some space over the normal
133725391Skarels  * hiwater mark so we don't lose messages due to normal flow
133825391Skarels  * control, but don't let the tty run amok.
133930695Skarels  * Sleeps here are not interruptible, but we return prematurely
134030695Skarels  * if new signals come in.
134125391Skarels  */
134225391Skarels ttycheckoutq(tp, wait)
134325391Skarels 	register struct tty *tp;
134425391Skarels 	int wait;
134525391Skarels {
134630695Skarels 	int hiwat, s, oldsig;
134725391Skarels 
134835811Smarc 	hiwat = tp->t_hiwat;
134925391Skarels 	s = spltty();
135030695Skarels 	oldsig = u.u_procp->p_sig;
135125391Skarels 	if (tp->t_outq.c_cc > hiwat + 200)
135229946Skarels 		while (tp->t_outq.c_cc > hiwat) {
135329946Skarels 			ttstart(tp);
135430695Skarels 			if (wait == 0 || u.u_procp->p_sig != oldsig) {
135529946Skarels 				splx(s);
135629946Skarels 				return (0);
135729946Skarels 			}
135830695Skarels 			timeout(wakeup, (caddr_t)&tp->t_outq, hz);
135929946Skarels 			tp->t_state |= TS_ASLEEP;
136030695Skarels 			sleep((caddr_t)&tp->t_outq, PZERO - 1);
136125391Skarels 		}
136225391Skarels 	splx(s);
136325391Skarels 	return (1);
136425391Skarels }
136525391Skarels 
136625391Skarels /*
13677502Sroot  * Called from the device's write routine after it has
13687502Sroot  * calculated the tty-structure given as argument.
13697502Sroot  */
137037584Smarc ttwrite(tp, uio, flag)
13717625Ssam 	register struct tty *tp;
13729578Ssam 	register struct uio *uio;
13737502Sroot {
13747502Sroot 	register char *cp;
137540712Skarels 	register int cc = 0, ce;
13769578Ssam 	int i, hiwat, cnt, error, s;
13777502Sroot 	char obuf[OBUFSIZ];
13787502Sroot 
137935811Smarc 	hiwat = tp->t_hiwat;
13809578Ssam 	cnt = uio->uio_resid;
13819578Ssam 	error = 0;
13827502Sroot loop:
138337584Smarc 	s = spltty();
138440712Skarels 	if ((tp->t_state&TS_CARR_ON) == 0 && (tp->t_cflag&CLOCAL) == 0) {
138537584Smarc 		if (tp->t_state&TS_ISOPEN) {
138637584Smarc 			splx(s);
138737584Smarc 			return (EIO);
138837728Smckusick 		} else if (flag & IO_NDELAY) {
138937584Smarc 			splx(s);
139040712Skarels 			error = EWOULDBLOCK;
139140712Skarels 			goto out;
139237584Smarc 		} else {
139337584Smarc 			/*
139437584Smarc 			 * sleep awaiting carrier
139537584Smarc 			 */
139640712Skarels 			error = tsleep((caddr_t)&tp->t_rawq, TTIPRI | PCATCH,
139740712Skarels 			    ttopen, 0);
139837584Smarc 			splx(s);
139943092Smarc 			if (error || (error = ttclosed(tp)))
140040712Skarels 				goto out;
140137584Smarc 			goto loop;
140237584Smarc 		}
140337584Smarc 	}
140437584Smarc 	splx(s);
14059578Ssam 	/*
14069578Ssam 	 * Hang the process if it's in the background.
14079578Ssam 	 */
140839555Smarc 	if (isbackground(u.u_procp, tp) &&
140935811Smarc 	    (tp->t_lflag&TOSTOP) && (u.u_procp->p_flag&SVFORK)==0 &&
141040712Skarels 	    (u.u_procp->p_sigignore & sigmask(SIGTTOU)) == 0 &&
141140712Skarels 	    (u.u_procp->p_sigmask & sigmask(SIGTTOU)) == 0 &&
141235811Smarc 	     u.u_procp->p_pgrp->pg_jobc) {
141342882Smarc 		pgsignal(u.u_procp->p_pgrp, SIGTTOU, 1);
141443092Smarc 		if ((error = tsleep((caddr_t)&lbolt, TTIPRI | PCATCH,
141543092Smarc 				     ttybg, 0)) ||
141643092Smarc 		    (error = ttclosed(tp)))
141740712Skarels 			goto out;
141821776Sbloom 		goto loop;
14197502Sroot 	}
14209578Ssam 	/*
14219578Ssam 	 * Process the user's data in at most OBUFSIZ
142240712Skarels 	 * chunks.  Perform any output translation.
142340712Skarels 	 * Keep track of high water mark, sleep on overflow
142440712Skarels 	 * awaiting device aid in acquiring new space.
14259578Ssam 	 */
142640712Skarels 	while (uio->uio_resid > 0 || cc > 0) {
142740712Skarels 		if (tp->t_lflag&FLUSHO) {
142840712Skarels 			uio->uio_resid = 0;
142940712Skarels 			return (0);
143040712Skarels 		}
143140712Skarels 		if (tp->t_outq.c_cc > hiwat)
143232067Skarels 			goto ovhiwat;
14339578Ssam 		/*
143440712Skarels 		 * Grab a hunk of data from the user,
143540712Skarels 		 * unless we have some leftover from last time.
14369578Ssam 		 */
14377822Sroot 		if (cc == 0) {
143840712Skarels 			cc = min(uio->uio_resid, OBUFSIZ);
143940712Skarels 			cp = obuf;
144040712Skarels 			error = uiomove(cp, cc, uio);
144140712Skarels 			if (error) {
144240712Skarels 				cc = 0;
144340712Skarels 				break;
144440712Skarels 			}
14457822Sroot 		}
14469578Ssam 		/*
14479578Ssam 		 * If nothing fancy need be done, grab those characters we
14489578Ssam 		 * can handle without any of ttyoutput's processing and
14499578Ssam 		 * just transfer them to the output q.  For those chars
14509578Ssam 		 * which require special processing (as indicated by the
14519578Ssam 		 * bits in partab), call ttyoutput.  After processing
14529578Ssam 		 * a hunk of data, look for FLUSHO so ^O's will take effect
14539578Ssam 		 * immediately.
14549578Ssam 		 */
14559578Ssam 		while (cc > 0) {
145640712Skarels 			if ((tp->t_oflag&OPOST) == 0)
14577502Sroot 				ce = cc;
14587502Sroot 			else {
145934492Skarels 				ce = cc - scanc((unsigned)cc, (u_char *)cp,
146034492Skarels 				   (u_char *)partab, 077);
14619578Ssam 				/*
14629578Ssam 				 * If ce is zero, then we're processing
14639578Ssam 				 * a special character through ttyoutput.
14649578Ssam 				 */
14659578Ssam 				if (ce == 0) {
14667502Sroot 					tp->t_rocount = 0;
14677502Sroot 					if (ttyoutput(*cp, tp) >= 0) {
146821776Sbloom 					    /* no c-lists, wait a bit */
146921776Sbloom 					    ttstart(tp);
147043092Smarc 					    if ((error = tsleep((caddr_t)&lbolt,
147143092Smarc 						TTOPRI | PCATCH, ttybuf, 0)) ||
147243092Smarc 						(error = ttclosed(tp)))
147340712Skarels 						    break;
147421776Sbloom 					    goto loop;
14757502Sroot 					}
14769578Ssam 					cp++, cc--;
147735811Smarc 					if ((tp->t_lflag&FLUSHO) ||
14789578Ssam 					    tp->t_outq.c_cc > hiwat)
14797502Sroot 						goto ovhiwat;
14809578Ssam 					continue;
14817502Sroot 				}
14827502Sroot 			}
14839578Ssam 			/*
14849578Ssam 			 * A bunch of normal characters have been found,
14859578Ssam 			 * transfer them en masse to the output queue and
14869578Ssam 			 * continue processing at the top of the loop.
14879578Ssam 			 * If there are any further characters in this
14889578Ssam 			 * <= OBUFSIZ chunk, the first should be a character
14899578Ssam 			 * requiring special handling by ttyoutput.
14909578Ssam 			 */
14917502Sroot 			tp->t_rocount = 0;
14929578Ssam 			i = b_to_q(cp, ce, &tp->t_outq);
14939578Ssam 			ce -= i;
14949578Ssam 			tp->t_col += ce;
14959578Ssam 			cp += ce, cc -= ce, tk_nout += ce;
149635811Smarc 			tp->t_outcc += ce;
14979578Ssam 			if (i > 0) {
14989578Ssam 				/* out of c-lists, wait a bit */
14997502Sroot 				ttstart(tp);
150043092Smarc 				if ((error = tsleep((caddr_t)&lbolt,
150143092Smarc 					    TTOPRI | PCATCH, ttybuf, 0)) ||
150243092Smarc 				    (error = ttclosed(tp)))
150340712Skarels 					break;
150421776Sbloom 				goto loop;
15057502Sroot 			}
150635811Smarc 			if (tp->t_lflag&FLUSHO || tp->t_outq.c_cc > hiwat)
150740712Skarels 				break;
15087502Sroot 		}
150935811Smarc 		ttstart(tp);
15107502Sroot 	}
151140712Skarels out:
151240712Skarels 	/*
151340712Skarels 	 * If cc is nonzero, we leave the uio structure inconsistent,
151440712Skarels 	 * as the offset and iov pointers have moved forward,
151540712Skarels 	 * but it doesn't matter (the call will either return short
151640712Skarels 	 * or restart with a new uio).
151740712Skarels 	 */
151840712Skarels 	uio->uio_resid += cc;
15198520Sroot 	return (error);
152040712Skarels 
15217502Sroot ovhiwat:
152232067Skarels 	ttstart(tp);
152332067Skarels 	s = spltty();
15249578Ssam 	/*
152535811Smarc 	 * This can only occur if FLUSHO is set in t_lflag,
152632067Skarels 	 * or if ttstart/oproc is synchronous (or very fast).
15279578Ssam 	 */
15287502Sroot 	if (tp->t_outq.c_cc <= hiwat) {
15299578Ssam 		splx(s);
15307502Sroot 		goto loop;
15317502Sroot 	}
153237728Smckusick 	if (flag & IO_NDELAY) {
153317545Skarels 		splx(s);
153440712Skarels 		uio->uio_resid += cc;
15357822Sroot 		if (uio->uio_resid == cnt)
15368520Sroot 			return (EWOULDBLOCK);
15378520Sroot 		return (0);
15387502Sroot 	}
15397502Sroot 	tp->t_state |= TS_ASLEEP;
154040712Skarels 	error = tsleep((caddr_t)&tp->t_outq, TTOPRI | PCATCH, ttyout, 0);
15419578Ssam 	splx(s);
154243092Smarc 	if (error || (error = ttclosed(tp)))
154340712Skarels 		goto out;
15447502Sroot 	goto loop;
15457502Sroot }
15467502Sroot 
15477502Sroot /*
15487502Sroot  * Rubout one character from the rawq of tp
15497502Sroot  * as cleanly as possible.
15507502Sroot  */
15517502Sroot ttyrub(c, tp)
15527625Ssam 	register c;
15537625Ssam 	register struct tty *tp;
15547502Sroot {
15557502Sroot 	register char *cp;
15567502Sroot 	register int savecol;
15577502Sroot 	int s;
15587502Sroot 	char *nextc();
15597502Sroot 
156042882Smarc 	if ((tp->t_lflag&ECHO) == 0 || (tp->t_lflag&EXTPROC))
15617502Sroot 		return;
156235811Smarc 	tp->t_lflag &= ~FLUSHO;
156335811Smarc 	if (tp->t_lflag&ECHOE) {
15647502Sroot 		if (tp->t_rocount == 0) {
15657502Sroot 			/*
15667502Sroot 			 * Screwed by ttwrite; retype
15677502Sroot 			 */
15687502Sroot 			ttyretype(tp);
15697502Sroot 			return;
15707502Sroot 		}
157135811Smarc 		if (c == ('\t'|TTY_QUOTE) || c == ('\n'|TTY_QUOTE))
15727502Sroot 			ttyrubo(tp, 2);
157335811Smarc 		else switch (partab[c&=0377]&077) {
15747502Sroot 
15757502Sroot 		case ORDINARY:
157635811Smarc 			ttyrubo(tp, 1);
15777502Sroot 			break;
15787502Sroot 
15797502Sroot 		case VTAB:
15807502Sroot 		case BACKSPACE:
15817502Sroot 		case CONTROL:
15827502Sroot 		case RETURN:
158335811Smarc 			if (tp->t_lflag&ECHOCTL)
15847502Sroot 				ttyrubo(tp, 2);
15857502Sroot 			break;
15867502Sroot 
158735811Smarc 		case TAB: {
158835811Smarc 			int c;
158935811Smarc 
15907502Sroot 			if (tp->t_rocount < tp->t_rawq.c_cc) {
15917502Sroot 				ttyretype(tp);
15927502Sroot 				return;
15937502Sroot 			}
159417545Skarels 			s = spltty();
15957502Sroot 			savecol = tp->t_col;
15969578Ssam 			tp->t_state |= TS_CNTTB;
159735811Smarc 			tp->t_lflag |= FLUSHO;
15987502Sroot 			tp->t_col = tp->t_rocol;
15999578Ssam 			cp = tp->t_rawq.c_cf;
160039407Smarc 			if (cp)
160139407Smarc 				c = *cp;	/* XXX FIX NEXTC */
160235811Smarc 			for (; cp; cp = nextc(&tp->t_rawq, cp, &c))
160335811Smarc 				ttyecho(c, tp);
160435811Smarc 			tp->t_lflag &= ~FLUSHO;
16059578Ssam 			tp->t_state &= ~TS_CNTTB;
16067502Sroot 			splx(s);
16077502Sroot 			/*
16087502Sroot 			 * savecol will now be length of the tab
16097502Sroot 			 */
16107502Sroot 			savecol -= tp->t_col;
16117502Sroot 			tp->t_col += savecol;
16127502Sroot 			if (savecol > 8)
16137502Sroot 				savecol = 8;		/* overflow screw */
16147502Sroot 			while (--savecol >= 0)
16157502Sroot 				(void) ttyoutput('\b', tp);
16167502Sroot 			break;
161735811Smarc 		}
16187502Sroot 
16197502Sroot 		default:
162037584Smarc 			/* XXX */
162135811Smarc 			printf("ttyrub: would panic c = %d, val = %d\n",
162235811Smarc 				c, partab[c&=0377]&077);
162335811Smarc 			/*panic("ttyrub");*/
16247502Sroot 		}
162535811Smarc 	} else if (tp->t_lflag&ECHOPRT) {
16269578Ssam 		if ((tp->t_state&TS_ERASE) == 0) {
16277502Sroot 			(void) ttyoutput('\\', tp);
16289578Ssam 			tp->t_state |= TS_ERASE;
16297502Sroot 		}
16307502Sroot 		ttyecho(c, tp);
16317502Sroot 	} else
163235811Smarc 		ttyecho(tp->t_cc[VERASE], tp);
16337502Sroot 	tp->t_rocount--;
16347502Sroot }
16357502Sroot 
16367502Sroot /*
16377502Sroot  * Crt back over cnt chars perhaps
16387502Sroot  * erasing them.
16397502Sroot  */
16407502Sroot ttyrubo(tp, cnt)
16417625Ssam 	register struct tty *tp;
16427625Ssam 	int cnt;
16437502Sroot {
16447502Sroot 
16457502Sroot 	while (--cnt >= 0)
164640712Skarels 		ttyoutstr("\b \b", tp);
16477502Sroot }
16487502Sroot 
16497502Sroot /*
16507502Sroot  * Reprint the rawq line.
16517502Sroot  * We assume c_cc has already been checked.
16527502Sroot  */
16537502Sroot ttyretype(tp)
16547625Ssam 	register struct tty *tp;
16557502Sroot {
16567502Sroot 	register char *cp;
16577502Sroot 	char *nextc();
165835811Smarc 	int s, c;
16597502Sroot 
166035811Smarc 	if (tp->t_cc[VREPRINT] != _POSIX_VDISABLE)
166135811Smarc 		ttyecho(tp->t_cc[VREPRINT], tp);
16627502Sroot 	(void) ttyoutput('\n', tp);
166317545Skarels 	s = spltty();
166435811Smarc 	/*** XXX *** FIX *** NEXTC IS BROKEN - DOESN'T CHECK QUOTE
166535811Smarc 	  BIT OF FIRST CHAR ****/
166635811Smarc 	for (cp = tp->t_canq.c_cf, c=(cp?*cp:0); cp; cp = nextc(&tp->t_canq, cp, &c)) {
166735811Smarc 		ttyecho(c, tp);
166835811Smarc 	}
166935811Smarc 	for (cp = tp->t_rawq.c_cf, c=(cp?*cp:0); cp; cp = nextc(&tp->t_rawq, cp, &c)) {
167035811Smarc 		ttyecho(c, tp);
167135811Smarc 	}
16729578Ssam 	tp->t_state &= ~TS_ERASE;
16737502Sroot 	splx(s);
16747502Sroot 	tp->t_rocount = tp->t_rawq.c_cc;
16757502Sroot 	tp->t_rocol = 0;
16767502Sroot }
16777502Sroot 
16787502Sroot /*
167935811Smarc  * Echo a typed character to the terminal.
16807502Sroot  */
16817502Sroot ttyecho(c, tp)
16827625Ssam 	register c;
16837625Ssam 	register struct tty *tp;
16847502Sroot {
16859578Ssam 	if ((tp->t_state&TS_CNTTB) == 0)
168635811Smarc 		tp->t_lflag &= ~FLUSHO;
168742882Smarc 	if (((tp->t_lflag&ECHO) == 0 && ((tp->t_lflag&ECHONL) == 0 ||
168842882Smarc 					  c == '\n')) || (tp->t_lflag&EXTPROC))
16897502Sroot 		return;
169035811Smarc 	if (tp->t_lflag&ECHOCTL) {
169140712Skarels 		if ((c&TTY_CHARMASK) <= 037 && c != '\t' && c != '\n' ||
169240712Skarels 		    c == 0177) {
16937502Sroot 			(void) ttyoutput('^', tp);
169435811Smarc 			c &= TTY_CHARMASK;
16957502Sroot 			if (c == 0177)
16967502Sroot 				c = '?';
16977502Sroot 			else
16987502Sroot 				c += 'A' - 1;
16997502Sroot 		}
17007502Sroot 	}
170135811Smarc 	(void) ttyoutput(c, tp);
17027502Sroot }
17037502Sroot 
17047502Sroot /*
17057502Sroot  * send string cp to tp
17067502Sroot  */
170740712Skarels ttyoutstr(cp, tp)
17087625Ssam 	register char *cp;
17097625Ssam 	register struct tty *tp;
17107502Sroot {
17117502Sroot 	register char c;
17127502Sroot 
17137502Sroot 	while (c = *cp++)
17147502Sroot 		(void) ttyoutput(c, tp);
17157502Sroot }
17167502Sroot 
17177502Sroot ttwakeup(tp)
17187502Sroot 	struct tty *tp;
17197502Sroot {
17207502Sroot 
17217502Sroot 	if (tp->t_rsel) {
17227502Sroot 		selwakeup(tp->t_rsel, tp->t_state&TS_RCOLL);
17237502Sroot 		tp->t_state &= ~TS_RCOLL;
17247502Sroot 		tp->t_rsel = 0;
17257502Sroot 	}
172612752Ssam 	if (tp->t_state & TS_ASYNC)
172742882Smarc 		pgsignal(tp->t_pgrp, SIGIO, 1);
17287502Sroot 	wakeup((caddr_t)&tp->t_rawq);
17297502Sroot }
173035811Smarc 
173135811Smarc /*
173235811Smarc  * set tty hi and low water marks
173335811Smarc  *
173435811Smarc  * Try to arrange the dynamics so there's about one second
173535811Smarc  * from hi to low water.
173635811Smarc  *
173735811Smarc  */
173835811Smarc ttsetwater(tp)
173935811Smarc 	struct tty *tp;
174035811Smarc {
174135811Smarc 	register cps = tp->t_ospeed / 10;
174235811Smarc 	register x;
174335811Smarc 
174435811Smarc #define clamp(x, h, l) ((x)>h ? h : ((x)<l) ? l : (x))
174535811Smarc 	tp->t_lowat = x = clamp(cps/2, TTMAXLOWAT, TTMINLOWAT);
174635811Smarc 	x += cps;
174735811Smarc 	x = clamp(x, TTMAXHIWAT, TTMINHIWAT);
174835811Smarc 	tp->t_hiwat = roundup(x, CBSIZE);
174935811Smarc #undef clamp
175035811Smarc }
175135811Smarc 
175235811Smarc ttspeedtab(speed, table)
175335811Smarc 	struct speedtab table[];
175435811Smarc {
175535811Smarc 	register int i;
175635811Smarc 
175735811Smarc 	for (i = 0; table[i].sp_speed != -1; i++)
175835811Smarc 		if (table[i].sp_speed == speed)
175935811Smarc 			return(table[i].sp_code);
176035811Smarc 	return(-1);
176135811Smarc }
176239407Smarc 
176341177Smarc int ttyhostname = 0;
176439407Smarc /*
176539407Smarc  * (^T)
176639407Smarc  * Report on state of foreground process group.
176739407Smarc  */
176839407Smarc ttyinfo(tp)
176939407Smarc 	struct tty *tp;
177039407Smarc {
177141177Smarc 	register struct proc *p, *pick = NULL;
177241177Smarc 	register char *cp = hostname;
177341177Smarc 	int x, s;
177441177Smarc 	struct timeval utime, stime;
177542350Smckusick #define	pgtok(a)	(((a)*NBPG)/1024)
177639407Smarc 
177739407Smarc 	if (ttycheckoutq(tp,0) == 0)
177839407Smarc 		return;
177941177Smarc 	/*
178041177Smarc 	 * hostname
178141177Smarc 	 */
178241177Smarc 	if (ttyhostname) {
178341177Smarc 		if (*cp == '\0')
178441177Smarc 			ttyprintf(tp, "amnesia");
178541177Smarc 		else
178641177Smarc 			while (*cp && *cp != '.')
178741177Smarc 				tputchar(*cp++, tp);
178841177Smarc 		tputchar(' ');
178941177Smarc 	}
179041177Smarc 	/*
179141177Smarc 	 * load average
179241177Smarc 	 */
179341177Smarc 	x = (averunnable[0] * 100 + FSCALE/2) >> FSHIFT;
179441177Smarc 	ttyprintf(tp, "load: %d.", x/100);
179541177Smarc 	ttyoutint(x%100, 10, 2, tp);
179639555Smarc 	if (tp->t_session == NULL)
179741177Smarc 		ttyprintf(tp, " not a controlling terminal\n");
179841177Smarc 	else if (tp->t_pgrp == NULL)
179941177Smarc 		ttyprintf(tp, " no foreground process group\n");
180041177Smarc 	else if ((p = tp->t_pgrp->pg_mem) == NULL)
180141177Smarc 		ttyprintf(tp, " empty foreground process group\n");
180239407Smarc 	else {
180341177Smarc 		/* pick interesting process */
180439407Smarc 		for (; p != NULL; p = p->p_pgrpnxt) {
180541177Smarc 			if (proc_compare(pick, p))
180641177Smarc 				pick = p;
180739407Smarc 		}
180841177Smarc 		ttyprintf(tp, "  cmd: %s %d [%s] ",
180941177Smarc 			pick->p_comm, pick->p_pid,
181041177Smarc 			pick->p_wmesg ? pick->p_wmesg : "running");
181141177Smarc 		/*
181241177Smarc 		 * cpu time
181341177Smarc 		 */
181441177Smarc 		if (u.u_procp == pick)
181541177Smarc 			s = splclock();
181641177Smarc 		utime = pick->p_utime;
181741177Smarc 		stime = pick->p_stime;
181841177Smarc 		if (u.u_procp == pick)
181941177Smarc 			splx(s);
182041177Smarc 		/* user time */
182141177Smarc 		x = (utime.tv_usec + 5000) / 10000; /* scale to 100's */
182241177Smarc 		ttyoutint(utime.tv_sec, 10, 1, tp);
182341177Smarc 		tputchar('.', tp);
182441177Smarc 		ttyoutint(x, 10, 2, tp);
182541177Smarc 		tputchar('u', tp);
182641177Smarc 		tputchar(' ', tp);
182741177Smarc 		/* system time */
182841177Smarc 		x = (stime.tv_usec + 5000) / 10000; /* scale to 100's */
182941177Smarc 		ttyoutint(stime.tv_sec, 10, 1, tp);
183041177Smarc 		tputchar('.', tp);
183141177Smarc 		ttyoutint(x, 10, 2, tp);
183241177Smarc 		tputchar('s', tp);
183341177Smarc 		tputchar(' ', tp);
183441177Smarc 		/*
183541177Smarc 		 * pctcpu
183641177Smarc 		 */
183741177Smarc 		x = pick->p_pctcpu * 10000 + FSCALE/2 >> FSHIFT;
183841177Smarc 		ttyoutint(x/100, 10, 1, tp);
183941177Smarc #ifdef notdef	/* do we really want this ??? */
184041177Smarc 		tputchar('.', tp);
184141177Smarc 		ttyoutint(x%100, 10, 2, tp);
184241177Smarc #endif
184341177Smarc 		ttyprintf(tp, "%% %dk\n", pgtok(pick->p_ssize + pick->p_dsize));
184439407Smarc 	}
184541177Smarc 	tp->t_rocount = 0;	/* so pending input will be retyped if BS */
184639407Smarc }
184739407Smarc 
184841177Smarc ttyoutint(n, base, min, tp)
184941177Smarc 	register int n, base, min;
185041177Smarc 	register struct tty *tp;
185141177Smarc {
185241177Smarc 	char info[16];
185341177Smarc 	register char *p = info;
185441177Smarc 
185541177Smarc 	while (--min >= 0 || n) {
185641177Smarc 		*p++ = "0123456789abcdef"[n%base];
185741177Smarc 		n /= base;
185841177Smarc 	}
185941177Smarc 	while (p > info)
186041177Smarc 		ttyoutput(*--p, tp);
186141177Smarc }
186241177Smarc 
186341177Smarc /*
186441177Smarc  * Returns 1 if p2 is "better" than p1
186541177Smarc  *
186641177Smarc  * The algorithm for picking the "interesting" process is thus:
186741177Smarc  *
186841177Smarc  *	1) (Only foreground processes are eligable - implied)
186941177Smarc  *	2) Runnable processes are favored over anything
187041177Smarc  *	   else.  The runner with the highest cpu
187141177Smarc  *	   utilization is picked (p_cpu).  Ties are
187241177Smarc  *	   broken by picking the highest pid.
187341177Smarc  *	3  Next, the sleeper with the shortest sleep
187441177Smarc  *	   time is favored.  With ties, we pick out
187541177Smarc  *	   just "short-term" sleepers (SSINTR == 0).
187641177Smarc  *	   Further ties are broken by picking the highest
187741177Smarc  *	   pid.
187841177Smarc  *
187941177Smarc  */
188041177Smarc #define isrun(p)	(((p)->p_stat == SRUN) || ((p)->p_stat == SIDL))
188141177Smarc proc_compare(p1, p2)
188241177Smarc 	register struct proc *p1, *p2;
188341177Smarc {
188441177Smarc 
188541177Smarc 	if (p1 == NULL)
188641177Smarc 		return (1);
188741177Smarc 	/*
188841177Smarc 	 * see if at least one of them is runnable
188941177Smarc 	 */
189041177Smarc 	switch (isrun(p1)<<1 | isrun(p2)) {
189141177Smarc 	case 0x01:
189241177Smarc 		return (1);
189341177Smarc 	case 0x10:
189441177Smarc 		return (0);
189541177Smarc 	case 0x11:
189641177Smarc 		/*
189741177Smarc 		 * tie - favor one with highest recent cpu utilization
189841177Smarc 		 */
189941177Smarc 		if (p2->p_cpu > p1->p_cpu)
190041177Smarc 			return (1);
190141177Smarc 		if (p1->p_cpu > p2->p_cpu)
190241177Smarc 			return (0);
190341177Smarc 		return (p2->p_pid > p1->p_pid);	/* tie - return highest pid */
190441177Smarc 	}
190541177Smarc 	/*
190641177Smarc 	 * pick the one with the smallest sleep time
190741177Smarc 	 */
190841177Smarc 	if (p2->p_slptime > p1->p_slptime)
190941177Smarc 		return (0);
191041177Smarc 	if (p1->p_slptime > p2->p_slptime)
191141177Smarc 		return (1);
191241177Smarc 	/*
191341177Smarc 	 * favor one sleeping in a non-interruptible sleep
191441177Smarc 	 */
191541177Smarc 	if (p1->p_flag&SSINTR && (p2->p_flag&SSINTR) == 0)
191641177Smarc 		return (1);
191741177Smarc 	if (p2->p_flag&SSINTR && (p1->p_flag&SSINTR) == 0)
191841177Smarc 		return (0);
191941177Smarc 	return(p2->p_pid > p1->p_pid);		/* tie - return highest pid */
192041177Smarc }
192139407Smarc #define TOTTY	0x2	/* XXX should be in header */
192239407Smarc /*VARARGS2*/
192339407Smarc ttyprintf(tp, fmt, x1)
192439555Smarc 	struct tty *tp;
192539407Smarc 	char *fmt;
192639407Smarc 	unsigned x1;
192739407Smarc {
192839555Smarc 	prf(fmt, &x1, TOTTY, (caddr_t)tp);
192939407Smarc }
193039555Smarc 
193139555Smarc /*
193239555Smarc  * Output char to tty; console putchar style.
193339555Smarc  */
193439555Smarc tputchar(c, tp)
193539555Smarc 	int c;
193639555Smarc 	struct tty *tp;
193739555Smarc {
193839555Smarc 	register s = spltty();
193939555Smarc 
194039555Smarc 	if ((tp->t_state & (TS_CARR_ON | TS_ISOPEN))
194139555Smarc 	    == (TS_CARR_ON | TS_ISOPEN)) {
194239555Smarc 		if (c == '\n')
194339555Smarc 			(void) ttyoutput('\r', tp);
194439555Smarc 		(void) ttyoutput(c, tp);
194539555Smarc 		ttstart(tp);
194639555Smarc 		splx(s);
194739555Smarc 		return (0);
194839555Smarc 	}
194939555Smarc 	splx(s);
195039555Smarc 	return (-1);
195139555Smarc }
1952