2 * Copyright (c) 1982, 1986, 1990, 1991, 1993
3 * The Regents of the University of California. All rights reserved.
4 * (c) UNIX System Laboratories, Inc.
5 * All or some portions of this file are derived from material licensed
6 * to the University of California by American Telephone and Telegraph
7 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
8 * the permission of UNIX System Laboratories, Inc.
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. All advertising materials mentioning features or use of this software
19 * must display the following acknowledgement:
20 * This product includes software developed by the University of
21 * California, Berkeley and its contributors.
22 * 4. Neither the name of the University nor the names of its contributors
23 * may be used to endorse or promote products derived from this software
24 * without specific prior written permission.
26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
38 * @(#)tty.c 8.8 (Berkeley) 1/21/94
39 * $Id: tty.c,v 1.118 1999/05/08 06:39:42 phk Exp $
44 * o Fix races for sending the start char in ttyflush().
45 * o Handle inter-byte timeout for "MIN > 0, TIME > 0" in ttyselect().
46 * With luck, there will be MIN chars before select() returns().
47 * o Handle CLOCAL consistently for ptys. Perhaps disallow setting it.
48 * o Don't allow input in TS_ZOMBIE case. It would be visible through
50 * o Do the new sio locking stuff here and use it to avoid special
53 * o Move EXTPROC and/or PENDIN to t_state?
54 * o Wrap most of ttioctl in spltty/splx.
55 * o Implement TIOCNOTTY or remove it from <sys/ioctl.h>.
56 * o Send STOP if IXOFF is toggled off while TS_TBLOCK is set.
57 * o Don't allow certain termios flags to affect disciplines other
58 * than TTYDISC. Cancel their effects before switch disciplines
59 * and ignore them if they are set while we are in another
61 * o Now that historical speed conversions are handled here, don't
63 * o Check for TS_CARR_ON being set while everything is closed and not
64 * waiting for carrier. TS_CARR_ON isn't cleared if nothing is open,
65 * so it would live until the next open even if carrier drops.
66 * o Restore TS_WOPEN since it is useful in pstat. It must be cleared
67 * only when _all_ openers leave open().
71 #include "opt_compat.h"
72 #include "opt_uconsole.h"
74 #include <sys/param.h>
75 #include <sys/systm.h>
76 #include <sys/filio.h>
77 #if defined(COMPAT_43) || defined(COMPAT_SUNOS)
78 #include <sys/ioctl_compat.h>
84 #include <sys/fcntl.h>
86 #include <sys/dkstat.h>
88 #include <sys/kernel.h>
89 #include <sys/vnode.h>
90 #include <sys/signalvar.h>
91 #include <sys/resourcevar.h>
92 #include <sys/malloc.h>
93 #include <sys/filedesc.h>
95 #include <sys/snoop.h>
101 #include <vm/vm_map.h>
103 MALLOC_DEFINE(M_TTYS, "ttys", "tty data structures");
105 static int proc_compare __P((struct proc *p1, struct proc *p2));
106 static int ttnread __P((struct tty *tp));
107 static void ttyecho __P((int c, struct tty *tp));
108 static int ttyoutput __P((int c, register struct tty *tp));
109 static void ttypend __P((struct tty *tp));
110 static void ttyretype __P((struct tty *tp));
111 static void ttyrub __P((int c, struct tty *tp));
112 static void ttyrubo __P((struct tty *tp, int cnt));
113 static void ttyunblock __P((struct tty *tp));
114 static int ttywflush __P((struct tty *tp));
117 * Table with character classes and parity. The 8th bit indicates parity,
118 * the 7th bit indicates the character is an alphameric or underscore (for
119 * ALTWERASE), and the low 6 bits indicate delay type. If the low 6 bits
120 * are 0 then the character needs no special processing on output; classes
121 * other than 0 might be translated or (not currently) require delays.
123 #define E 0x00 /* Even parity. */
124 #define O 0x80 /* Odd parity. */
125 #define PARITY(c) (char_type[c] & O)
127 #define ALPHA 0x40 /* Alpha or underscore. */
128 #define ISALPHA(c) (char_type[(c) & TTY_CHARMASK] & ALPHA)
130 #define CCLASSMASK 0x3f
131 #define CCLASS(c) (char_type[c] & CCLASSMASK)
136 #define NA ORDINARY | ALPHA
142 static u_char const char_type[] = {
143 E|CC, O|CC, O|CC, E|CC, O|CC, E|CC, E|CC, O|CC, /* nul - bel */
144 O|BS, E|TB, E|NL, O|CC, E|VT, O|CR, O|CC, E|CC, /* bs - si */
145 O|CC, E|CC, E|CC, O|CC, E|CC, O|CC, O|CC, E|CC, /* dle - etb */
146 E|CC, O|CC, O|CC, E|CC, O|CC, E|CC, E|CC, O|CC, /* can - us */
147 O|NO, E|NO, E|NO, O|NO, E|NO, O|NO, O|NO, E|NO, /* sp - ' */
148 E|NO, O|NO, O|NO, E|NO, O|NO, E|NO, E|NO, O|NO, /* ( - / */
149 E|NA, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* 0 - 7 */
150 O|NA, E|NA, E|NO, O|NO, E|NO, O|NO, O|NO, E|NO, /* 8 - ? */
151 O|NO, E|NA, E|NA, O|NA, E|NA, O|NA, O|NA, E|NA, /* @ - G */
152 E|NA, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* H - O */
153 E|NA, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* P - W */
154 O|NA, E|NA, E|NA, O|NO, E|NO, O|NO, O|NO, O|NA, /* X - _ */
155 E|NO, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* ` - g */
156 O|NA, E|NA, E|NA, O|NA, E|NA, O|NA, O|NA, E|NA, /* h - o */
157 O|NA, E|NA, E|NA, O|NA, E|NA, O|NA, O|NA, E|NA, /* p - w */
158 E|NA, O|NA, O|NA, E|NO, O|NO, E|NO, E|NO, O|CC, /* x - del */
160 * Meta chars; should be settable per character set;
161 * for now, treat them all as normal characters.
163 NA, NA, NA, NA, NA, NA, NA, NA,
164 NA, NA, NA, NA, NA, NA, NA, NA,
165 NA, NA, NA, NA, NA, NA, NA, NA,
166 NA, NA, NA, NA, NA, NA, NA, NA,
167 NA, NA, NA, NA, NA, NA, NA, NA,
168 NA, NA, NA, NA, NA, NA, NA, NA,
169 NA, NA, NA, NA, NA, NA, NA, NA,
170 NA, NA, NA, NA, NA, NA, NA, NA,
171 NA, NA, NA, NA, NA, NA, NA, NA,
172 NA, NA, NA, NA, NA, NA, NA, NA,
173 NA, NA, NA, NA, NA, NA, NA, NA,
174 NA, NA, NA, NA, NA, NA, NA, NA,
175 NA, NA, NA, NA, NA, NA, NA, NA,
176 NA, NA, NA, NA, NA, NA, NA, NA,
177 NA, NA, NA, NA, NA, NA, NA, NA,
178 NA, NA, NA, NA, NA, NA, NA, NA,
189 /* Macros to clear/set/test flags. */
190 #define SET(t, f) (t) |= (f)
191 #define CLR(t, f) (t) &= ~(f)
192 #define ISSET(t, f) ((t) & (f))
194 #undef MAX_INPUT /* XXX wrong in <sys/syslimits.h> */
195 #define MAX_INPUT TTYHOG /* XXX limit is usually larger for !ICANON */
198 * Initial open of tty, or (re)entry to standard tty line discipline.
203 register struct tty *tp;
209 if (!ISSET(tp->t_state, TS_ISOPEN)) {
210 SET(tp->t_state, TS_ISOPEN);
211 if (ISSET(tp->t_cflag, CLOCAL))
212 SET(tp->t_state, TS_CONNECTED);
213 bzero(&tp->t_winsize, sizeof(tp->t_winsize));
221 * Handle close() on a tty line: flush and set to initial state,
222 * bumping generation number so that pending read/write calls
223 * can detect recycling of the tty.
224 * XXX our caller should have done `spltty(); l_close(); ttyclose();'
225 * and l_close() should have flushed, but we repeat the spltty() and
226 * the flush in case there are buggy callers.
230 register struct tty *tp;
234 funsetown(tp->t_sigio);
239 ttyflush(tp, FREAD | FWRITE);
240 clist_free_cblocks(&tp->t_canq);
241 clist_free_cblocks(&tp->t_outq);
242 clist_free_cblocks(&tp->t_rawq);
245 if (ISSET(tp->t_state, TS_SNOOP) && tp->t_sc != NULL)
246 snpdown((struct snoop *)tp->t_sc);
250 tp->t_line = TTYDISC;
252 tp->t_session = NULL;
258 #define FLUSHQ(q) { \
260 ndflush(q, (q)->c_cc); \
263 /* Is 'c' a line delimiter ("break" character)? */
264 #define TTBREAKC(c, lflag) \
265 ((c) == '\n' || (((c) == cc[VEOF] || \
266 (c) == cc[VEOL] || ((c) == cc[VEOL2] && lflag & IEXTEN)) && \
267 (c) != _POSIX_VDISABLE))
270 * Process input of a single character received on a tty.
275 register struct tty *tp;
277 register tcflag_t iflag, lflag;
282 * If input is pending take it first.
285 if (ISSET(lflag, PENDIN))
290 if (ISSET(lflag, ICANON)) {
300 * Block further input iff:
301 * current input > threshold AND input is available to user program
302 * AND input flow control is enabled and not yet invoked.
303 * The 3 is slop for PARMRK.
306 if (tp->t_rawq.c_cc + tp->t_canq.c_cc > tp->t_ihiwat - 3 &&
307 (!ISSET(lflag, ICANON) || tp->t_canq.c_cc != 0) &&
308 (ISSET(tp->t_cflag, CRTS_IFLOW) || ISSET(iflag, IXOFF)) &&
309 !ISSET(tp->t_state, TS_TBLOCK))
312 /* Handle exceptional conditions (break, parity, framing). */
314 err = (ISSET(c, TTY_ERRORMASK));
316 CLR(c, TTY_ERRORMASK);
317 if (ISSET(err, TTY_BI)) {
318 if (ISSET(iflag, IGNBRK))
320 if (ISSET(iflag, BRKINT)) {
321 ttyflush(tp, FREAD | FWRITE);
322 pgsignal(tp->t_pgrp, SIGINT, 1);
325 if (ISSET(iflag, PARMRK))
327 } else if ((ISSET(err, TTY_PE) && ISSET(iflag, INPCK))
328 || ISSET(err, TTY_FE)) {
329 if (ISSET(iflag, IGNPAR))
331 else if (ISSET(iflag, PARMRK)) {
333 if (tp->t_rawq.c_cc + tp->t_canq.c_cc >
336 (void)putc(0377 | TTY_QUOTE, &tp->t_rawq);
337 (void)putc(0 | TTY_QUOTE, &tp->t_rawq);
338 (void)putc(c | TTY_QUOTE, &tp->t_rawq);
345 if (!ISSET(tp->t_state, TS_TYPEN) && ISSET(iflag, ISTRIP))
347 if (!ISSET(lflag, EXTPROC)) {
349 * Check for literal nexting very first
351 if (ISSET(tp->t_state, TS_LNCH)) {
353 CLR(tp->t_state, TS_LNCH);
356 * Scan for special characters. This code
357 * is really just a big case statement with
358 * non-constant cases. The bottom of the
359 * case statement is labeled ``endcase'', so goto
360 * it after a case match, or similar.
364 * Control chars which aren't controlled
365 * by ICANON, ISIG, or IXON.
367 if (ISSET(lflag, IEXTEN)) {
368 if (CCEQ(cc[VLNEXT], c)) {
369 if (ISSET(lflag, ECHO)) {
370 if (ISSET(lflag, ECHOE)) {
371 (void)ttyoutput('^', tp);
372 (void)ttyoutput('\b', tp);
376 SET(tp->t_state, TS_LNCH);
379 if (CCEQ(cc[VDISCARD], c)) {
380 if (ISSET(lflag, FLUSHO))
381 CLR(tp->t_lflag, FLUSHO);
383 ttyflush(tp, FWRITE);
385 if (tp->t_rawq.c_cc + tp->t_canq.c_cc)
387 SET(tp->t_lflag, FLUSHO);
395 if (ISSET(lflag, ISIG)) {
396 if (CCEQ(cc[VINTR], c) || CCEQ(cc[VQUIT], c)) {
397 if (!ISSET(lflag, NOFLSH))
398 ttyflush(tp, FREAD | FWRITE);
401 CCEQ(cc[VINTR], c) ? SIGINT : SIGQUIT, 1);
404 if (CCEQ(cc[VSUSP], c)) {
405 if (!ISSET(lflag, NOFLSH))
408 pgsignal(tp->t_pgrp, SIGTSTP, 1);
413 * Handle start/stop characters.
415 if (ISSET(iflag, IXON)) {
416 if (CCEQ(cc[VSTOP], c)) {
417 if (!ISSET(tp->t_state, TS_TTSTOP)) {
418 SET(tp->t_state, TS_TTSTOP);
419 #ifdef sun4c /* XXX */
420 (*tp->t_stop)(tp, 0);
422 (*devsw(tp->t_dev)->d_stop)(tp,
427 if (!CCEQ(cc[VSTART], c))
430 * if VSTART == VSTOP then toggle
434 if (CCEQ(cc[VSTART], c))
438 * IGNCR, ICRNL, & INLCR
441 if (ISSET(iflag, IGNCR))
443 else if (ISSET(iflag, ICRNL))
445 } else if (c == '\n' && ISSET(iflag, INLCR))
448 if (!ISSET(tp->t_lflag, EXTPROC) && ISSET(lflag, ICANON)) {
450 * From here on down canonical mode character
451 * processing takes place.
456 if (CCEQ(cc[VERASE], c)) {
458 ttyrub(unputc(&tp->t_rawq), tp);
464 if (CCEQ(cc[VKILL], c)) {
465 if (ISSET(lflag, ECHOKE) &&
466 tp->t_rawq.c_cc == tp->t_rocount &&
467 !ISSET(lflag, ECHOPRT))
468 while (tp->t_rawq.c_cc)
469 ttyrub(unputc(&tp->t_rawq), tp);
472 if (ISSET(lflag, ECHOK) ||
473 ISSET(lflag, ECHOKE))
478 CLR(tp->t_state, TS_LOCAL);
484 if (CCEQ(cc[VWERASE], c) && ISSET(lflag, IEXTEN)) {
490 while ((c = unputc(&tp->t_rawq)) == ' ' || c == '\t')
495 * erase last char of word and remember the
496 * next chars type (for ALTWERASE)
499 c = unputc(&tp->t_rawq);
502 if (c == ' ' || c == '\t') {
503 (void)putc(c, &tp->t_rawq);
512 c = unputc(&tp->t_rawq);
515 } while (c != ' ' && c != '\t' &&
516 (!ISSET(lflag, ALTWERASE) || ISALPHA(c) == ctype));
517 (void)putc(c, &tp->t_rawq);
523 if (CCEQ(cc[VREPRINT], c) && ISSET(lflag, IEXTEN)) {
528 * ^T - kernel info and generate SIGINFO
530 if (CCEQ(cc[VSTATUS], c) && ISSET(lflag, IEXTEN)) {
531 if (ISSET(lflag, ISIG))
532 pgsignal(tp->t_pgrp, SIGINFO, 1);
533 if (!ISSET(lflag, NOKERNINFO))
539 * Check for input buffer overflow
541 if (tp->t_rawq.c_cc + tp->t_canq.c_cc >= MAX_INPUT) {
543 if (ISSET(iflag, IMAXBEL)) {
544 if (tp->t_outq.c_cc < tp->t_ohiwat)
545 (void)ttyoutput(CTRL('g'), tp);
550 if ( c == 0377 && ISSET(iflag, PARMRK) && !ISSET(iflag, ISTRIP)
551 && ISSET(iflag, IGNBRK|IGNPAR) != (IGNBRK|IGNPAR))
552 (void)putc(0377 | TTY_QUOTE, &tp->t_rawq);
555 * Put data char in q for user and
556 * wakeup on seeing a line delimiter.
558 if (putc(c, &tp->t_rawq) >= 0) {
559 if (!ISSET(lflag, ICANON)) {
564 if (TTBREAKC(c, lflag)) {
566 catq(&tp->t_rawq, &tp->t_canq);
568 } else if (tp->t_rocount++ == 0)
569 tp->t_rocol = tp->t_column;
570 if (ISSET(tp->t_state, TS_ERASE)) {
572 * end of prterase \.../
574 CLR(tp->t_state, TS_ERASE);
575 (void)ttyoutput('/', tp);
579 if (CCEQ(cc[VEOF], c) && ISSET(lflag, ECHO)) {
581 * Place the cursor over the '^' of the ^D.
583 i = imin(2, tp->t_column - i);
585 (void)ttyoutput('\b', tp);
592 * IXANY means allow any character to restart output.
594 if (ISSET(tp->t_state, TS_TTSTOP) &&
595 !ISSET(iflag, IXANY) && cc[VSTART] != cc[VSTOP])
598 CLR(tp->t_lflag, FLUSHO);
599 CLR(tp->t_state, TS_TTSTOP);
601 return (ttstart(tp));
605 * Output a single character on a tty, doing output processing
606 * as needed (expanding tabs, newline processing, etc.).
607 * Returns < 0 if succeeds, otherwise returns char to resend.
613 register struct tty *tp;
615 register tcflag_t oflag;
619 if (!ISSET(oflag, OPOST)) {
620 if (ISSET(tp->t_lflag, FLUSHO))
622 if (putc(c, &tp->t_outq))
629 * Do tab expansion if OXTABS is set. Special case if we external
630 * processing, we don't do the tab expansion because we'll probably
631 * get it wrong. If tab expansion needs to be done, let it happen
634 CLR(c, ~TTY_CHARMASK);
636 ISSET(oflag, OXTABS) && !ISSET(tp->t_lflag, EXTPROC)) {
637 c = 8 - (tp->t_column & 7);
638 if (!ISSET(tp->t_lflag, FLUSHO)) {
639 s = spltty(); /* Don't interrupt tabs. */
640 c -= b_to_q(" ", c, &tp->t_outq);
646 return (c ? -1 : '\t');
648 if (c == CEOT && ISSET(oflag, ONOEOT))
652 * Newline translation: if ONLCR is set,
653 * translate newline into "\r\n".
655 if (c == '\n' && ISSET(tp->t_oflag, ONLCR)) {
658 if (putc('\r', &tp->t_outq))
663 if (!ISSET(tp->t_lflag, FLUSHO) && putc(c, &tp->t_outq))
682 col = (col + 8) & ~7;
690 * Ioctls for all tty devices. Called after line-discipline specific ioctl
691 * has been called to do discipline-specific functions and/or reject any
692 * of these ioctl commands.
696 ttioctl(tp, cmd, data, flag)
697 register struct tty *tp;
702 register struct proc *p;
705 p = curproc; /* XXX */
707 /* If the ioctl involves modification, hang if in the background. */
731 #if defined(COMPAT_43) || defined(COMPAT_SUNOS)
741 while (isbackground(p, tp) &&
742 (p->p_flag & P_PPWAIT) == 0 &&
743 (p->p_sigignore & sigmask(SIGTTOU)) == 0 &&
744 (p->p_sigmask & sigmask(SIGTTOU)) == 0) {
745 if (p->p_pgrp->pg_jobc == 0)
747 pgsignal(p->p_pgrp, SIGTTOU, 1);
748 error = ttysleep(tp, &lbolt, TTOPRI | PCATCH, "ttybg1",
756 switch (cmd) { /* Process the ioctl. */
757 case FIOASYNC: /* set/clear async i/o */
760 SET(tp->t_state, TS_ASYNC);
762 CLR(tp->t_state, TS_ASYNC);
765 case FIONBIO: /* set/clear non-blocking i/o */
766 break; /* XXX: delete. */
767 case FIONREAD: /* get # bytes to read */
769 *(int *)data = ttnread(tp);
775 * Policy -- Don't allow FIOSETOWN on someone else's
778 if (tp->t_session != NULL && !isctty(p, tp))
781 error = fsetown(*(int *)data, &tp->t_sigio);
786 if (tp->t_session != NULL && !isctty(p, tp))
788 *(int *)data = fgetown(tp->t_sigio);
791 case TIOCEXCL: /* set exclusive use of tty */
793 SET(tp->t_state, TS_XCLUDE);
796 case TIOCFLUSH: { /* flush buffers */
797 register int flags = *(int *)data;
800 flags = FREAD | FWRITE;
802 flags &= FREAD | FWRITE;
806 case TIOCCONS: /* become virtual console */
808 if (constty && constty != tp &&
809 ISSET(constty->t_state, TS_CONNECTED))
812 if ((error = suser(p)) != 0)
816 } else if (tp == constty)
819 case TIOCDRAIN: /* wait till output drained */
824 case TIOCGETA: { /* get termios struct */
825 struct termios *t = (struct termios *)data;
827 bcopy(&tp->t_termios, t, sizeof(struct termios));
830 case TIOCGETD: /* get line discipline */
831 *(int *)data = tp->t_line;
833 case TIOCGWINSZ: /* get window size */
834 *(struct winsize *)data = tp->t_winsize;
836 case TIOCGPGRP: /* get pgrp of tty */
839 *(int *)data = tp->t_pgrp ? tp->t_pgrp->pg_id : NO_PID;
842 case TIOCHPCL: /* hang up on last close */
844 SET(tp->t_cflag, HUPCL);
848 case TIOCNXCL: /* reset exclusive use of tty */
850 CLR(tp->t_state, TS_XCLUDE);
853 case TIOCOUTQ: /* output queue size */
854 *(int *)data = tp->t_outq.c_cc;
856 case TIOCSETA: /* set termios struct */
857 case TIOCSETAW: /* drain output, set */
858 case TIOCSETAF: { /* drn out, fls in, set */
859 register struct termios *t = (struct termios *)data;
861 if (t->c_ispeed == 0)
862 t->c_ispeed = t->c_ospeed;
863 if (t->c_ispeed == 0)
864 t->c_ispeed = tp->t_ospeed;
865 if (t->c_ispeed == 0)
868 if (cmd == TIOCSETAW || cmd == TIOCSETAF) {
874 if (cmd == TIOCSETAF)
877 if (!ISSET(t->c_cflag, CIGNORE)) {
879 * Set device hardware.
881 if (tp->t_param && (error = (*tp->t_param)(tp, t))) {
885 if (ISSET(t->c_cflag, CLOCAL) &&
886 !ISSET(tp->t_cflag, CLOCAL)) {
888 * XXX disconnections would be too hard to
889 * get rid of without this kludge. The only
890 * way to get rid of controlling terminals
891 * is to exit from the session leader.
893 CLR(tp->t_state, TS_ZOMBIE);
895 wakeup(TSA_CARR_ON(tp));
899 if ((ISSET(tp->t_state, TS_CARR_ON) ||
900 ISSET(t->c_cflag, CLOCAL)) &&
901 !ISSET(tp->t_state, TS_ZOMBIE))
902 SET(tp->t_state, TS_CONNECTED);
904 CLR(tp->t_state, TS_CONNECTED);
905 tp->t_cflag = t->c_cflag;
906 tp->t_ispeed = t->c_ispeed;
907 if (t->c_ospeed != 0)
908 tp->t_ospeed = t->c_ospeed;
911 if (ISSET(t->c_lflag, ICANON) != ISSET(tp->t_lflag, ICANON) &&
913 if (ISSET(t->c_lflag, ICANON))
914 SET(tp->t_lflag, PENDIN);
917 * XXX we really shouldn't allow toggling
918 * ICANON while we're in a non-termios line
919 * discipline. Now we have to worry about
920 * panicing for a null queue.
922 if (tp->t_canq.c_cbreserved > 0 &&
923 tp->t_rawq.c_cbreserved > 0) {
924 catq(&tp->t_rawq, &tp->t_canq);
926 * XXX the queue limits may be
927 * different, so the old queue
928 * swapping method no longer works.
930 catq(&tp->t_canq, &tp->t_rawq);
932 CLR(tp->t_lflag, PENDIN);
936 tp->t_iflag = t->c_iflag;
937 tp->t_oflag = t->c_oflag;
939 * Make the EXTPROC bit read only.
941 if (ISSET(tp->t_lflag, EXTPROC))
942 SET(t->c_lflag, EXTPROC);
944 CLR(t->c_lflag, EXTPROC);
945 tp->t_lflag = t->c_lflag | ISSET(tp->t_lflag, PENDIN);
946 if (t->c_cc[VMIN] != tp->t_cc[VMIN] ||
947 t->c_cc[VTIME] != tp->t_cc[VTIME])
949 bcopy(t->c_cc, tp->t_cc, sizeof(t->c_cc));
953 case TIOCSETD: { /* set line discipline */
954 register int t = *(int *)data;
955 dev_t device = tp->t_dev;
957 if ((u_int)t >= nlinesw)
959 if (t != tp->t_line) {
961 (*linesw[tp->t_line].l_close)(tp, flag);
962 error = (*linesw[t].l_open)(device, tp);
964 (void)(*linesw[tp->t_line].l_open)(device, tp);
973 case TIOCSTART: /* start output, like ^Q */
975 if (ISSET(tp->t_state, TS_TTSTOP) ||
976 ISSET(tp->t_lflag, FLUSHO)) {
977 CLR(tp->t_lflag, FLUSHO);
978 CLR(tp->t_state, TS_TTSTOP);
983 case TIOCSTI: /* simulate terminal input */
984 if ((flag & FREAD) == 0 && suser(p))
986 if (!isctty(p, tp) && suser(p))
989 (*linesw[tp->t_line].l_rint)(*(u_char *)data, tp);
992 case TIOCSTOP: /* stop output, like ^S */
994 if (!ISSET(tp->t_state, TS_TTSTOP)) {
995 SET(tp->t_state, TS_TTSTOP);
996 #ifdef sun4c /* XXX */
997 (*tp->t_stop)(tp, 0);
999 (*devsw(tp->t_dev)->d_stop)(tp, 0);
1004 case TIOCSCTTY: /* become controlling tty */
1005 /* Session ctty vnode pointer set in vnode layer. */
1006 if (!SESS_LEADER(p) ||
1007 ((p->p_session->s_ttyvp || tp->t_session) &&
1008 (tp->t_session != p->p_session)))
1010 tp->t_session = p->p_session;
1011 tp->t_pgrp = p->p_pgrp;
1012 p->p_session->s_ttyp = tp;
1013 p->p_flag |= P_CONTROLT;
1015 case TIOCSPGRP: { /* set pgrp of tty */
1016 register struct pgrp *pgrp = pgfind(*(int *)data);
1020 else if (pgrp == NULL || pgrp->pg_session != p->p_session)
1025 case TIOCSTAT: /* simulate control-T */
1030 case TIOCSWINSZ: /* set window size */
1031 if (bcmp((caddr_t)&tp->t_winsize, data,
1032 sizeof (struct winsize))) {
1033 tp->t_winsize = *(struct winsize *)data;
1034 pgsignal(tp->t_pgrp, SIGWINCH, 1);
1037 case TIOCSDRAINWAIT:
1041 tp->t_timeout = *(int *)data * hz;
1042 wakeup(TSA_OCOMPLETE(tp));
1043 wakeup(TSA_OLOWAT(tp));
1045 case TIOCGDRAINWAIT:
1046 *(int *)data = tp->t_timeout / hz;
1049 #if defined(COMPAT_43) || defined(COMPAT_SUNOS)
1050 return (ttcompat(tp, cmd, data, flag));
1059 ttypoll(tp, events, p)
1067 if (tp == NULL) /* XXX used to return ENXIO, but that means true! */
1068 return ((events & (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM))
1072 if (events & (POLLIN | POLLRDNORM)) {
1073 if (ttnread(tp) > 0 || ISSET(tp->t_state, TS_ZOMBIE))
1074 revents |= events & (POLLIN | POLLRDNORM);
1076 selrecord(p, &tp->t_rsel);
1078 if (events & (POLLOUT | POLLWRNORM)) {
1079 if ((tp->t_outq.c_cc <= tp->t_olowat &&
1080 ISSET(tp->t_state, TS_CONNECTED))
1081 || ISSET(tp->t_state, TS_ZOMBIE))
1082 revents |= events & (POLLOUT | POLLWRNORM);
1084 selrecord(p, &tp->t_wsel);
1091 * This is a wrapper for compatibility with the select vector used by
1092 * cdevsw. It relies on a proper xxxdevtotty routine.
1095 ttpoll(dev, events, p)
1100 return ttypoll((*devsw(dev)->d_devtotty)(dev), events, p);
1104 * Must be called at spltty().
1112 if (ISSET(tp->t_lflag, PENDIN))
1114 nread = tp->t_canq.c_cc;
1115 if (!ISSET(tp->t_lflag, ICANON)) {
1116 nread += tp->t_rawq.c_cc;
1117 if (nread < tp->t_cc[VMIN] && tp->t_cc[VTIME] == 0)
1124 * Wait for output to drain.
1128 register struct tty *tp;
1134 while ((tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY)) &&
1135 ISSET(tp->t_state, TS_CONNECTED) && tp->t_oproc) {
1137 if ((tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY)) &&
1138 ISSET(tp->t_state, TS_CONNECTED)) {
1139 SET(tp->t_state, TS_SO_OCOMPLETE);
1140 error = ttysleep(tp, TSA_OCOMPLETE(tp),
1141 TTOPRI | PCATCH, "ttywai",
1144 if (error == EWOULDBLOCK)
1151 if (!error && (tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY)))
1158 * Flush if successfully wait.
1166 if ((error = ttywait(tp)) == 0)
1167 ttyflush(tp, FREAD);
1172 * Flush tty read and/or write queues, notifying anyone waiting.
1176 register struct tty *tp;
1186 FLUSHQ(&tp->t_outq);
1187 CLR(tp->t_state, TS_TTSTOP);
1189 #ifdef sun4c /* XXX */
1190 (*tp->t_stop)(tp, rw);
1192 (*devsw(tp->t_dev)->d_stop)(tp, rw);
1195 FLUSHQ(&tp->t_canq);
1196 FLUSHQ(&tp->t_rawq);
1197 CLR(tp->t_lflag, PENDIN);
1200 CLR(tp->t_state, TS_LOCAL);
1202 if (ISSET(tp->t_state, TS_TBLOCK)) {
1204 FLUSHQ(&tp->t_outq);
1208 * Don't let leave any state that might clobber the
1209 * next line discipline (although we should do more
1210 * to send the START char). Not clearing the state
1211 * may have caused the "putc to a clist with no
1212 * reserved cblocks" panic/printf.
1214 CLR(tp->t_state, TS_TBLOCK);
1216 #if 0 /* forget it, sleeping isn't always safe and we don't know when it is */
1217 if (ISSET(tp->t_iflag, IXOFF)) {
1219 * XXX wait a bit in the hope that the stop
1220 * character (if any) will go out. Waiting
1221 * isn't good since it allows races. This
1222 * will be fixed when the stop character is
1223 * put in a special queue. Don't bother with
1224 * the checks in ttywait() since the timeout
1227 SET(tp->t_state, TS_SO_OCOMPLETE);
1228 ttysleep(tp, TSA_OCOMPLETE(tp), TTOPRI,
1231 * Don't try sending the stop character again.
1233 CLR(tp->t_state, TS_TBLOCK);
1240 FLUSHQ(&tp->t_outq);
1247 * Copy in the default termios characters.
1254 bcopy(ttydefchars, t->c_cc, sizeof t->c_cc);
1265 termioschars(&tp->t_termios);
1269 * Handle input high water. Send stop character for the IXOFF case. Turn
1270 * on our input flow control bit and propagate the changes to the driver.
1271 * XXX the stop character should be put in a special high priority queue.
1278 SET(tp->t_state, TS_TBLOCK);
1279 if (ISSET(tp->t_iflag, IXOFF) && tp->t_cc[VSTOP] != _POSIX_VDISABLE &&
1280 putc(tp->t_cc[VSTOP], &tp->t_outq) != 0)
1281 CLR(tp->t_state, TS_TBLOCK); /* try again later */
1286 * Handle input low water. Send start character for the IXOFF case. Turn
1287 * off our input flow control bit and propagate the changes to the driver.
1288 * XXX the start character should be put in a special high priority queue.
1295 CLR(tp->t_state, TS_TBLOCK);
1296 if (ISSET(tp->t_iflag, IXOFF) && tp->t_cc[VSTART] != _POSIX_VDISABLE &&
1297 putc(tp->t_cc[VSTART], &tp->t_outq) != 0)
1298 SET(tp->t_state, TS_TBLOCK); /* try again later */
1303 /* Not used by any current (i386) drivers. */
1305 * Restart after an inter-char delay.
1314 KASSERT(tp_arg != NULL, ("ttrstrt"));
1319 CLR(tp->t_state, TS_TIMEOUT);
1331 if (tp->t_oproc != NULL) /* XXX: Kludge for pty. */
1337 * "close" a line discipline
1345 if (flag & FNONBLOCK || ttywflush(tp))
1346 ttyflush(tp, FREAD | FWRITE);
1351 * Handle modem control transition on a tty.
1352 * Flag indicates new state of carrier.
1353 * Returns 0 if the line should be turned off, otherwise 1.
1357 register struct tty *tp;
1361 if (ISSET(tp->t_state, TS_CARR_ON) && ISSET(tp->t_cflag, MDMBUF)) {
1363 * MDMBUF: do flow control according to carrier flag
1364 * XXX TS_CAR_OFLOW doesn't do anything yet. TS_TTSTOP
1365 * works if IXON and IXANY are clear.
1368 CLR(tp->t_state, TS_CAR_OFLOW);
1369 CLR(tp->t_state, TS_TTSTOP);
1371 } else if (!ISSET(tp->t_state, TS_CAR_OFLOW)) {
1372 SET(tp->t_state, TS_CAR_OFLOW);
1373 SET(tp->t_state, TS_TTSTOP);
1374 #ifdef sun4c /* XXX */
1375 (*tp->t_stop)(tp, 0);
1377 (*devsw(tp->t_dev)->d_stop)(tp, 0);
1380 } else if (flag == 0) {
1384 CLR(tp->t_state, TS_CARR_ON);
1385 if (ISSET(tp->t_state, TS_ISOPEN) &&
1386 !ISSET(tp->t_cflag, CLOCAL)) {
1387 SET(tp->t_state, TS_ZOMBIE);
1388 CLR(tp->t_state, TS_CONNECTED);
1389 if (tp->t_session && tp->t_session->s_leader)
1390 psignal(tp->t_session->s_leader, SIGHUP);
1391 ttyflush(tp, FREAD | FWRITE);
1398 SET(tp->t_state, TS_CARR_ON);
1399 if (!ISSET(tp->t_state, TS_ZOMBIE))
1400 SET(tp->t_state, TS_CONNECTED);
1401 wakeup(TSA_CARR_ON(tp));
1409 * Reinput pending characters after state switch
1414 register struct tty *tp;
1419 CLR(tp->t_lflag, PENDIN);
1420 SET(tp->t_state, TS_TYPEN);
1422 * XXX this assumes too much about clist internals. It may even
1423 * fail if the cblock slush pool is empty. We can't allocate more
1424 * cblocks here because we are called from an interrupt handler
1425 * and clist_alloc_cblocks() can wait.
1428 bzero(&tp->t_rawq, sizeof tp->t_rawq);
1429 tp->t_rawq.c_cbmax = tq.c_cbmax;
1430 tp->t_rawq.c_cbreserved = tq.c_cbreserved;
1431 while ((c = getc(&tq)) >= 0)
1433 CLR(tp->t_state, TS_TYPEN);
1437 * Process a read call on a tty device.
1440 ttread(tp, uio, flag)
1441 register struct tty *tp;
1445 register struct clist *qp;
1447 register tcflag_t lflag;
1448 register cc_t *cc = tp->t_cc;
1449 register struct proc *p = curproc;
1450 int s, first, error = 0;
1451 int has_stime = 0, last_cc = 0;
1452 long slp = 0; /* XXX this should be renamed `timo'. */
1453 struct timeval stime;
1457 lflag = tp->t_lflag;
1459 * take pending input first
1461 if (ISSET(lflag, PENDIN)) {
1463 splx(s); /* reduce latency */
1465 lflag = tp->t_lflag; /* XXX ttypend() clobbers it */
1469 * Hang process if it's in the background.
1471 if (isbackground(p, tp)) {
1473 if ((p->p_sigignore & sigmask(SIGTTIN)) ||
1474 (p->p_sigmask & sigmask(SIGTTIN)) ||
1475 p->p_flag & P_PPWAIT || p->p_pgrp->pg_jobc == 0)
1477 pgsignal(p->p_pgrp, SIGTTIN, 1);
1478 error = ttysleep(tp, &lbolt, TTIPRI | PCATCH, "ttybg2", 0);
1484 if (ISSET(tp->t_state, TS_ZOMBIE)) {
1486 return (0); /* EOF */
1490 * If canonical, use the canonical queue,
1491 * else use the raw queue.
1493 * (should get rid of clists...)
1495 qp = ISSET(lflag, ICANON) ? &tp->t_canq : &tp->t_rawq;
1497 if (flag & IO_NDELAY) {
1500 if (!ISSET(lflag, ICANON) && cc[VMIN] == 0) {
1505 return (EWOULDBLOCK);
1507 if (!ISSET(lflag, ICANON)) {
1510 struct timeval timecopy;
1513 * Check each of the four combinations.
1514 * (m > 0 && t == 0) is the normal read case.
1515 * It should be fairly efficient, so we check that and its
1516 * companion case (m == 0 && t == 0) first.
1517 * For the other two cases, we compute the target sleep time
1526 /* m, t and qp->c_cc are all 0. 0 is enough input. */
1530 t *= 100000; /* time in us */
1531 #define diff(t1, t2) (((t1).tv_sec - (t2).tv_sec) * 1000000 + \
1532 ((t1).tv_usec - (t2).tv_usec))
1538 getmicrotime(&timecopy);
1540 /* first character, start timer */
1544 } else if (qp->c_cc > last_cc) {
1545 /* got a character, restart timer */
1549 /* nothing, check expiration */
1550 slp = t - diff(timecopy, stime);
1555 } else { /* m == 0 */
1558 getmicrotime(&timecopy);
1564 slp = t - diff(timecopy, stime);
1566 /* Timed out, but 0 is enough input. */
1574 * Rounding down may make us wake up just short
1575 * of the target, so we round up.
1576 * The formula is ceiling(slp * hz/1000000).
1577 * 32-bit arithmetic is enough for hz < 169.
1578 * XXX see tvtohz() for how to avoid overflow if hz
1579 * is large (divide by `tick' and/or arrange to
1580 * use tvtohz() if hz is large).
1582 slp = (long) (((u_long)slp * hz) + 999999) / 1000000;
1585 if (qp->c_cc <= 0) {
1588 * There is no input, or not enough input and we can block.
1590 error = ttysleep(tp, TSA_HUP_OR_INPUT(tp), TTIPRI | PCATCH,
1591 ISSET(tp->t_state, TS_CONNECTED) ?
1592 "ttyin" : "ttyhup", (int)slp);
1594 if (error == EWOULDBLOCK)
1599 * XXX what happens if another process eats some input
1600 * while we are asleep (not just here)? It would be
1601 * safest to detect changes and reset our state variables
1602 * (has_stime and last_cc).
1610 * Input present, check for input mapping and processing.
1613 if (ISSET(lflag, ICANON | ISIG))
1619 icc = imin(uio->uio_resid, IBUFSIZ);
1620 icc = q_to_b(qp, ibuf, icc);
1626 error = uiomove(ibuf, icc, uio);
1628 * XXX if there was an error then we should ungetc() the
1629 * unmoved chars and reduce icc here.
1632 if (ISSET(tp->t_lflag, ECHO) &&
1633 ISSET(tp->t_state, TS_SNOOP) && tp->t_sc != NULL)
1634 snpin((struct snoop *)tp->t_sc, ibuf, icc);
1638 if (uio->uio_resid == 0)
1652 * delayed suspend (^Y)
1654 if (CCEQ(cc[VDSUSP], c) &&
1655 ISSET(lflag, IEXTEN | ISIG) == (IEXTEN | ISIG)) {
1656 pgsignal(tp->t_pgrp, SIGTSTP, 1);
1658 error = ttysleep(tp, &lbolt, TTIPRI | PCATCH,
1667 * Interpret EOF only in canonical mode.
1669 if (CCEQ(cc[VEOF], c) && ISSET(lflag, ICANON))
1672 * Give user character.
1674 error = ureadc(c, uio);
1676 /* XXX should ungetc(c, qp). */
1680 * Only snoop directly on input in echo mode. Non-echoed
1681 * input will be snooped later iff the application echoes it.
1683 if (ISSET(tp->t_lflag, ECHO) &&
1684 ISSET(tp->t_state, TS_SNOOP) && tp->t_sc != NULL)
1685 snpinc((struct snoop *)tp->t_sc, (char)c);
1687 if (uio->uio_resid == 0)
1690 * In canonical mode check for a "break character"
1691 * marking the end of a "line of input".
1693 if (ISSET(lflag, ICANON) && TTBREAKC(c, lflag))
1700 * Look to unblock input now that (presumably)
1701 * the input queue has gone down.
1704 if (ISSET(tp->t_state, TS_TBLOCK) &&
1705 tp->t_rawq.c_cc + tp->t_canq.c_cc <= tp->t_ilowat)
1713 * Check the output queue on tp for space for a kernel message (from uprintf
1714 * or tprintf). Allow some space over the normal hiwater mark so we don't
1715 * lose messages due to normal flow control, but don't let the tty run amok.
1716 * Sleeps here are not interruptible, but we return prematurely if new signals
1720 ttycheckoutq(tp, wait)
1721 register struct tty *tp;
1724 int hiwat, s, oldsig;
1726 hiwat = tp->t_ohiwat;
1728 oldsig = wait ? curproc->p_siglist : 0;
1729 if (tp->t_outq.c_cc > hiwat + OBUFSIZ + 100)
1730 while (tp->t_outq.c_cc > hiwat) {
1732 if (tp->t_outq.c_cc <= hiwat)
1734 if (wait == 0 || curproc->p_siglist != oldsig) {
1738 SET(tp->t_state, TS_SO_OLOWAT);
1739 tsleep(TSA_OLOWAT(tp), PZERO - 1, "ttoutq", hz);
1746 * Process a write call on a tty device.
1749 ttwrite(tp, uio, flag)
1750 register struct tty *tp;
1751 register struct uio *uio;
1754 register char *cp = NULL;
1755 register int cc, ce;
1756 register struct proc *p;
1757 int i, hiwat, cnt, error, s;
1760 hiwat = tp->t_ohiwat;
1761 cnt = uio->uio_resid;
1766 if (ISSET(tp->t_state, TS_ZOMBIE)) {
1768 if (uio->uio_resid == cnt)
1772 if (!ISSET(tp->t_state, TS_CONNECTED)) {
1773 if (flag & IO_NDELAY) {
1775 error = EWOULDBLOCK;
1778 error = ttysleep(tp, TSA_CARR_ON(tp), TTIPRI | PCATCH,
1787 * Hang the process if it's in the background.
1790 if (isbackground(p, tp) &&
1791 ISSET(tp->t_lflag, TOSTOP) && (p->p_flag & P_PPWAIT) == 0 &&
1792 (p->p_sigignore & sigmask(SIGTTOU)) == 0 &&
1793 (p->p_sigmask & sigmask(SIGTTOU)) == 0) {
1794 if (p->p_pgrp->pg_jobc == 0) {
1798 pgsignal(p->p_pgrp, SIGTTOU, 1);
1799 error = ttysleep(tp, &lbolt, TTIPRI | PCATCH, "ttybg4", 0);
1805 * Process the user's data in at most OBUFSIZ chunks. Perform any
1806 * output translation. Keep track of high water mark, sleep on
1807 * overflow awaiting device aid in acquiring new space.
1809 while (uio->uio_resid > 0 || cc > 0) {
1810 if (ISSET(tp->t_lflag, FLUSHO)) {
1814 if (tp->t_outq.c_cc > hiwat)
1817 * Grab a hunk of data from the user, unless we have some
1818 * leftover from last time.
1821 cc = imin(uio->uio_resid, OBUFSIZ);
1823 error = uiomove(cp, cc, uio);
1829 if (ISSET(tp->t_state, TS_SNOOP) && tp->t_sc != NULL)
1830 snpin((struct snoop *)tp->t_sc, cp, cc);
1834 * If nothing fancy need be done, grab those characters we
1835 * can handle without any of ttyoutput's processing and
1836 * just transfer them to the output q. For those chars
1837 * which require special processing (as indicated by the
1838 * bits in char_type), call ttyoutput. After processing
1839 * a hunk of data, look for FLUSHO so ^O's will take effect
1843 if (!ISSET(tp->t_oflag, OPOST))
1846 ce = cc - scanc((u_int)cc, (u_char *)cp,
1847 char_type, CCLASSMASK);
1849 * If ce is zero, then we're processing
1850 * a special character through ttyoutput.
1854 if (ttyoutput(*cp, tp) >= 0) {
1855 /* No Clists, wait a bit. */
1857 if (flag & IO_NDELAY) {
1858 error = EWOULDBLOCK;
1861 error = ttysleep(tp, &lbolt,
1870 if (ISSET(tp->t_lflag, FLUSHO) ||
1871 tp->t_outq.c_cc > hiwat)
1877 * A bunch of normal characters have been found.
1878 * Transfer them en masse to the output queue and
1879 * continue processing at the top of the loop.
1880 * If there are any further characters in this
1881 * <= OBUFSIZ chunk, the first should be a character
1882 * requiring special handling by ttyoutput.
1885 i = b_to_q(cp, ce, &tp->t_outq);
1888 cp += ce, cc -= ce, tk_nout += ce;
1891 /* No Clists, wait a bit. */
1893 if (flag & IO_NDELAY) {
1894 error = EWOULDBLOCK;
1897 error = ttysleep(tp, &lbolt, TTOPRI | PCATCH,
1903 if (ISSET(tp->t_lflag, FLUSHO) ||
1904 tp->t_outq.c_cc > hiwat)
1911 * If cc is nonzero, we leave the uio structure inconsistent, as the
1912 * offset and iov pointers have moved forward, but it doesn't matter
1913 * (the call will either return short or restart with a new uio).
1915 uio->uio_resid += cc;
1922 * This can only occur if FLUSHO is set in t_lflag,
1923 * or if ttstart/oproc is synchronous (or very fast).
1925 if (tp->t_outq.c_cc <= hiwat) {
1929 if (flag & IO_NDELAY) {
1931 uio->uio_resid += cc;
1932 return (uio->uio_resid == cnt ? EWOULDBLOCK : 0);
1934 SET(tp->t_state, TS_SO_OLOWAT);
1935 error = ttysleep(tp, TSA_OLOWAT(tp), TTOPRI | PCATCH, "ttywri",
1938 if (error == EWOULDBLOCK)
1946 * Rubout one character from the rawq of tp
1947 * as cleanly as possible.
1952 register struct tty *tp;
1955 register int savecol;
1958 if (!ISSET(tp->t_lflag, ECHO) || ISSET(tp->t_lflag, EXTPROC))
1960 CLR(tp->t_lflag, FLUSHO);
1961 if (ISSET(tp->t_lflag, ECHOE)) {
1962 if (tp->t_rocount == 0) {
1964 * Screwed by ttwrite; retype
1969 if (c == ('\t' | TTY_QUOTE) || c == ('\n' | TTY_QUOTE))
1972 CLR(c, ~TTY_CHARMASK);
1973 switch (CCLASS(c)) {
1982 if (ISSET(tp->t_lflag, ECHOCTL))
1986 if (tp->t_rocount < tp->t_rawq.c_cc) {
1991 savecol = tp->t_column;
1992 SET(tp->t_state, TS_CNTTB);
1993 SET(tp->t_lflag, FLUSHO);
1994 tp->t_column = tp->t_rocol;
1995 cp = tp->t_rawq.c_cf;
1997 tabc = *cp; /* XXX FIX NEXTC */
1998 for (; cp; cp = nextc(&tp->t_rawq, cp, &tabc))
2000 CLR(tp->t_lflag, FLUSHO);
2001 CLR(tp->t_state, TS_CNTTB);
2004 /* savecol will now be length of the tab. */
2005 savecol -= tp->t_column;
2006 tp->t_column += savecol;
2008 savecol = 8; /* overflow screw */
2009 while (--savecol >= 0)
2010 (void)ttyoutput('\b', tp);
2013 #define PANICSTR "ttyrub: would panic c = %d, val = %d\n"
2014 (void)printf(PANICSTR, c, CCLASS(c));
2016 panic(PANICSTR, c, CCLASS(c));
2020 } else if (ISSET(tp->t_lflag, ECHOPRT)) {
2021 if (!ISSET(tp->t_state, TS_ERASE)) {
2022 SET(tp->t_state, TS_ERASE);
2023 (void)ttyoutput('\\', tp);
2027 ttyecho(tp->t_cc[VERASE], tp);
2032 * Back over cnt characters, erasing them.
2036 register struct tty *tp;
2041 (void)ttyoutput('\b', tp);
2042 (void)ttyoutput(' ', tp);
2043 (void)ttyoutput('\b', tp);
2049 * Reprint the rawq line. Note, it is assumed that c_cc has already
2054 register struct tty *tp;
2059 /* Echo the reprint character. */
2060 if (tp->t_cc[VREPRINT] != _POSIX_VDISABLE)
2061 ttyecho(tp->t_cc[VREPRINT], tp);
2063 (void)ttyoutput('\n', tp);
2067 * FIX: NEXTC IS BROKEN - DOESN'T CHECK QUOTE
2068 * BIT OF FIRST CHAR.
2071 for (cp = tp->t_canq.c_cf, c = (cp != NULL ? *cp : 0);
2072 cp != NULL; cp = nextc(&tp->t_canq, cp, &c))
2074 for (cp = tp->t_rawq.c_cf, c = (cp != NULL ? *cp : 0);
2075 cp != NULL; cp = nextc(&tp->t_rawq, cp, &c))
2077 CLR(tp->t_state, TS_ERASE);
2080 tp->t_rocount = tp->t_rawq.c_cc;
2085 * Echo a typed character to the terminal.
2090 register struct tty *tp;
2093 if (!ISSET(tp->t_state, TS_CNTTB))
2094 CLR(tp->t_lflag, FLUSHO);
2095 if ((!ISSET(tp->t_lflag, ECHO) &&
2096 (c != '\n' || !ISSET(tp->t_lflag, ECHONL))) ||
2097 ISSET(tp->t_lflag, EXTPROC))
2099 if (ISSET(tp->t_lflag, ECHOCTL) &&
2100 ((ISSET(c, TTY_CHARMASK) <= 037 && c != '\t' && c != '\n') ||
2101 ISSET(c, TTY_CHARMASK) == 0177)) {
2102 (void)ttyoutput('^', tp);
2103 CLR(c, ~TTY_CHARMASK);
2109 (void)ttyoutput(c, tp);
2113 * Wake up any readers on a tty.
2117 register struct tty *tp;
2120 if (tp->t_rsel.si_pid != 0)
2121 selwakeup(&tp->t_rsel);
2122 if (ISSET(tp->t_state, TS_ASYNC) && tp->t_sigio != NULL)
2123 pgsigio(tp->t_sigio, SIGIO, (tp->t_session != NULL));
2124 wakeup(TSA_HUP_OR_INPUT(tp));
2128 * Wake up any writers on a tty.
2132 register struct tty *tp;
2135 if (tp->t_wsel.si_pid != 0 && tp->t_outq.c_cc <= tp->t_olowat)
2136 selwakeup(&tp->t_wsel);
2137 if (ISSET(tp->t_state, TS_BUSY | TS_SO_OCOMPLETE) ==
2138 TS_SO_OCOMPLETE && tp->t_outq.c_cc == 0) {
2139 CLR(tp->t_state, TS_SO_OCOMPLETE);
2140 wakeup(TSA_OCOMPLETE(tp));
2142 if (ISSET(tp->t_state, TS_SO_OLOWAT) &&
2143 tp->t_outq.c_cc <= tp->t_olowat) {
2144 CLR(tp->t_state, TS_SO_OLOWAT);
2145 wakeup(TSA_OLOWAT(tp));
2150 * Look up a code for a specified speed in a conversion table;
2151 * used by drivers to map software speed values to hardware parameters.
2154 ttspeedtab(speed, table)
2156 register struct speedtab *table;
2159 for ( ; table->sp_speed != -1; table++)
2160 if (table->sp_speed == speed)
2161 return (table->sp_code);
2166 * Set input and output watermarks and buffer sizes. For input, the
2167 * high watermark is about one second's worth of input above empty, the
2168 * low watermark is slightly below high water, and the buffer size is a
2169 * driver-dependent amount above high water. For output, the watermarks
2170 * are near the ends of the buffer, with about 1 second's worth of input
2171 * between them. All this only applies to the standard line discipline.
2177 register int cps, ttmaxhiwat, x;
2180 clist_alloc_cblocks(&tp->t_canq, TTYHOG, 512);
2181 switch (tp->t_ispeedwat) {
2183 cps = tp->t_ispeed / 10;
2187 * This case is for old drivers that don't know about
2188 * t_ispeedwat. Arrange for them to get the old buffer
2189 * sizes and watermarks.
2191 cps = TTYHOG - 2 * 256;
2192 tp->t_ififosize = 2 * 256;
2195 cps = tp->t_ispeedwat / 10;
2199 tp->t_ilowat = 7 * cps / 8;
2200 x = cps + tp->t_ififosize;
2201 clist_alloc_cblocks(&tp->t_rawq, x, x);
2204 switch (tp->t_ospeedwat) {
2206 cps = tp->t_ospeed / 10;
2207 ttmaxhiwat = 2 * TTMAXHIWAT;
2210 cps = tp->t_ospeed / 10;
2211 ttmaxhiwat = TTMAXHIWAT;
2214 cps = tp->t_ospeedwat / 10;
2215 ttmaxhiwat = 8 * TTMAXHIWAT;
2218 #define CLAMP(x, h, l) ((x) > h ? h : ((x) < l) ? l : (x))
2219 tp->t_olowat = x = CLAMP(cps / 2, TTMAXLOWAT, TTMINLOWAT);
2221 x = CLAMP(x, ttmaxhiwat, TTMINHIWAT); /* XXX clamps are too magic */
2222 tp->t_ohiwat = roundup(x, CBSIZE); /* XXX for compat */
2223 x = imax(tp->t_ohiwat, TTMAXHIWAT); /* XXX for compat/safety */
2225 clist_alloc_cblocks(&tp->t_outq, x, x);
2230 * Report on state of foreground process group.
2234 register struct tty *tp;
2236 register struct proc *p, *pick;
2237 struct timeval utime, stime;
2240 if (ttycheckoutq(tp,0) == 0)
2243 /* Print load average. */
2244 tmp = (averunnable.ldavg[0] * 100 + FSCALE / 2) >> FSHIFT;
2245 ttyprintf(tp, "load: %d.%02d ", tmp / 100, tmp % 100);
2247 if (tp->t_session == NULL)
2248 ttyprintf(tp, "not a controlling terminal\n");
2249 else if (tp->t_pgrp == NULL)
2250 ttyprintf(tp, "no foreground process group\n");
2251 else if ((p = tp->t_pgrp->pg_members.lh_first) == 0)
2252 ttyprintf(tp, "empty foreground process group\n");
2254 /* Pick interesting process. */
2255 for (pick = NULL; p != 0; p = p->p_pglist.le_next)
2256 if (proc_compare(pick, p))
2259 ttyprintf(tp, " cmd: %s %d [%s] ", pick->p_comm, pick->p_pid,
2260 pick->p_stat == SRUN ? "running" :
2261 pick->p_wmesg ? pick->p_wmesg : "iowait");
2263 if (pick->p_flag & P_INMEM) {
2264 calcru(pick, &utime, &stime, NULL);
2266 /* Print user time. */
2267 ttyprintf(tp, "%ld.%02ldu ",
2268 utime.tv_sec, utime.tv_usec / 10000);
2270 /* Print system time. */
2271 ttyprintf(tp, "%ld.%02lds ",
2272 stime.tv_sec, stime.tv_usec / 10000);
2274 ttyprintf(tp, "?.??u ?.??s ");
2276 /* Print percentage cpu, resident set size. */
2277 tmp = (pick->p_pctcpu * 10000 + FSCALE / 2) >> FSHIFT;
2278 ttyprintf(tp, "%d%% %ldk\n",
2280 pick->p_stat == SIDL || pick->p_stat == SZOMB ? 0 :
2281 (long)pgtok(vmspace_resident_count(pick->p_vmspace)));
2283 tp->t_rocount = 0; /* so pending input will be retyped if BS */
2287 * Returns 1 if p2 is "better" than p1
2289 * The algorithm for picking the "interesting" process is thus:
2291 * 1) Only foreground processes are eligible - implied.
2292 * 2) Runnable processes are favored over anything else. The runner
2293 * with the highest cpu utilization is picked (p_estcpu). Ties are
2294 * broken by picking the highest pid.
2295 * 3) The sleeper with the shortest sleep time is next. With ties,
2296 * we pick out just "short-term" sleepers (P_SINTR == 0).
2297 * 4) Further ties are broken by picking the highest pid.
2299 #define ISRUN(p) (((p)->p_stat == SRUN) || ((p)->p_stat == SIDL))
2300 #define TESTAB(a, b) ((a)<<1 | (b))
2306 proc_compare(p1, p2)
2307 register struct proc *p1, *p2;
2313 * see if at least one of them is runnable
2315 switch (TESTAB(ISRUN(p1), ISRUN(p2))) {
2322 * tie - favor one with highest recent cpu utilization
2324 if (p2->p_estcpu > p1->p_estcpu)
2326 if (p1->p_estcpu > p2->p_estcpu)
2328 return (p2->p_pid > p1->p_pid); /* tie - return highest pid */
2333 switch (TESTAB(p1->p_stat == SZOMB, p2->p_stat == SZOMB)) {
2339 return (p2->p_pid > p1->p_pid); /* tie - return highest pid */
2342 * pick the one with the smallest sleep time
2344 if (p2->p_slptime > p1->p_slptime)
2346 if (p1->p_slptime > p2->p_slptime)
2349 * favor one sleeping in a non-interruptible sleep
2351 if (p1->p_flag & P_SINTR && (p2->p_flag & P_SINTR) == 0)
2353 if (p2->p_flag & P_SINTR && (p1->p_flag & P_SINTR) == 0)
2355 return (p2->p_pid > p1->p_pid); /* tie - return highest pid */
2359 * Output char to tty; console putchar style.
2369 if (!ISSET(tp->t_state, TS_CONNECTED)) {
2374 (void)ttyoutput('\r', tp);
2375 (void)ttyoutput(c, tp);
2382 * Sleep on chan, returning ERESTART if tty changed while we napped and
2383 * returning any errors (e.g. EINTR/EWOULDBLOCK) reported by tsleep. If
2384 * the tty is revoked, restarting a pending call will redo validation done
2385 * at the start of the call.
2388 ttysleep(tp, chan, pri, wmesg, timo)
2398 error = tsleep(chan, pri, wmesg, timo);
2401 return (tp->t_gen == gen ? 0 : ERESTART);
2406 * XXX this is usable not useful or used. Most tty drivers have
2407 * ifdefs for using ttymalloc() but assume a different interface.
2410 * Allocate a tty struct. Clists in the struct will be allocated by
2418 tp = malloc(sizeof *tp, M_TTYS, M_WAITOK);
2419 bzero(tp, sizeof *tp);
2424 #if 0 /* XXX not yet usable: session leader holds a ref (see kern_exit.c). */
2426 * Free a tty struct. Clists in the struct should have been freed by