proc->thread stage 4: rework the VFS and DEVICE subsystems to take thread
[dragonfly.git] / sys / kern / tty.c
CommitLineData
984263bc
MD
1/*-
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.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
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.
25 *
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
36 * SUCH DAMAGE.
37 *
38 * @(#)tty.c 8.8 (Berkeley) 1/21/94
39 * $FreeBSD: src/sys/kern/tty.c,v 1.129.2.5 2002/03/11 01:32:31 dd Exp $
dadab5e9 40 * $DragonFly: src/sys/kern/tty.c,v 1.4 2003/06/25 03:55:57 dillon Exp $
984263bc
MD
41 */
42
43/*-
44 * TODO:
45 * o Fix races for sending the start char in ttyflush().
46 * o Handle inter-byte timeout for "MIN > 0, TIME > 0" in ttyselect().
47 * With luck, there will be MIN chars before select() returns().
48 * o Handle CLOCAL consistently for ptys. Perhaps disallow setting it.
49 * o Don't allow input in TS_ZOMBIE case. It would be visible through
50 * FIONREAD.
51 * o Do the new sio locking stuff here and use it to avoid special
52 * case for EXTPROC?
53 * o Lock PENDIN too?
54 * o Move EXTPROC and/or PENDIN to t_state?
55 * o Wrap most of ttioctl in spltty/splx.
56 * o Implement TIOCNOTTY or remove it from <sys/ioctl.h>.
57 * o Send STOP if IXOFF is toggled off while TS_TBLOCK is set.
58 * o Don't allow certain termios flags to affect disciplines other
59 * than TTYDISC. Cancel their effects before switch disciplines
60 * and ignore them if they are set while we are in another
61 * discipline.
62 * o Now that historical speed conversions are handled here, don't
63 * do them in drivers.
64 * o Check for TS_CARR_ON being set while everything is closed and not
65 * waiting for carrier. TS_CARR_ON isn't cleared if nothing is open,
66 * so it would live until the next open even if carrier drops.
67 * o Restore TS_WOPEN since it is useful in pstat. It must be cleared
68 * only when _all_ openers leave open().
69 */
70
71#include "opt_compat.h"
72#include "opt_uconsole.h"
73
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>
79#endif
80#include <sys/proc.h>
81#define TTYDEFCHARS
82#include <sys/tty.h>
83#undef TTYDEFCHARS
84#include <sys/fcntl.h>
85#include <sys/conf.h>
86#include <sys/dkstat.h>
87#include <sys/poll.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>
94#include <sys/sysctl.h>
95
96#include <vm/vm.h>
97#include <sys/lock.h>
98#include <vm/pmap.h>
99#include <vm/vm_map.h>
100
101MALLOC_DEFINE(M_TTYS, "ttys", "tty data structures");
102
103static int proc_compare __P((struct proc *p1, struct proc *p2));
104static int ttnread __P((struct tty *tp));
105static void ttyecho __P((int c, struct tty *tp));
106static int ttyoutput __P((int c, register struct tty *tp));
107static void ttypend __P((struct tty *tp));
108static void ttyretype __P((struct tty *tp));
109static void ttyrub __P((int c, struct tty *tp));
110static void ttyrubo __P((struct tty *tp, int cnt));
111static void ttyunblock __P((struct tty *tp));
112static int ttywflush __P((struct tty *tp));
113static int filt_ttyread __P((struct knote *kn, long hint));
114static void filt_ttyrdetach __P((struct knote *kn));
115static int filt_ttywrite __P((struct knote *kn, long hint));
116static void filt_ttywdetach __P((struct knote *kn));
117
118/*
119 * Table with character classes and parity. The 8th bit indicates parity,
120 * the 7th bit indicates the character is an alphameric or underscore (for
121 * ALTWERASE), and the low 6 bits indicate delay type. If the low 6 bits
122 * are 0 then the character needs no special processing on output; classes
123 * other than 0 might be translated or (not currently) require delays.
124 */
125#define E 0x00 /* Even parity. */
126#define O 0x80 /* Odd parity. */
127#define PARITY(c) (char_type[c] & O)
128
129#define ALPHA 0x40 /* Alpha or underscore. */
130#define ISALPHA(c) (char_type[(c) & TTY_CHARMASK] & ALPHA)
131
132#define CCLASSMASK 0x3f
133#define CCLASS(c) (char_type[c] & CCLASSMASK)
134
135#define BS BACKSPACE
136#define CC CONTROL
137#define CR RETURN
138#define NA ORDINARY | ALPHA
139#define NL NEWLINE
140#define NO ORDINARY
141#define TB TAB
142#define VT VTAB
143
144static u_char const char_type[] = {
145 E|CC, O|CC, O|CC, E|CC, O|CC, E|CC, E|CC, O|CC, /* nul - bel */
146 O|BS, E|TB, E|NL, O|CC, E|VT, O|CR, O|CC, E|CC, /* bs - si */
147 O|CC, E|CC, E|CC, O|CC, E|CC, O|CC, O|CC, E|CC, /* dle - etb */
148 E|CC, O|CC, O|CC, E|CC, O|CC, E|CC, E|CC, O|CC, /* can - us */
149 O|NO, E|NO, E|NO, O|NO, E|NO, O|NO, O|NO, E|NO, /* sp - ' */
150 E|NO, O|NO, O|NO, E|NO, O|NO, E|NO, E|NO, O|NO, /* ( - / */
151 E|NA, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* 0 - 7 */
152 O|NA, E|NA, E|NO, O|NO, E|NO, O|NO, O|NO, E|NO, /* 8 - ? */
153 O|NO, E|NA, E|NA, O|NA, E|NA, O|NA, O|NA, E|NA, /* @ - G */
154 E|NA, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* H - O */
155 E|NA, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* P - W */
156 O|NA, E|NA, E|NA, O|NO, E|NO, O|NO, O|NO, O|NA, /* X - _ */
157 E|NO, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* ` - g */
158 O|NA, E|NA, E|NA, O|NA, E|NA, O|NA, O|NA, E|NA, /* h - o */
159 O|NA, E|NA, E|NA, O|NA, E|NA, O|NA, O|NA, E|NA, /* p - w */
160 E|NA, O|NA, O|NA, E|NO, O|NO, E|NO, E|NO, O|CC, /* x - del */
161 /*
162 * Meta chars; should be settable per character set;
163 * for now, treat them all as normal characters.
164 */
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,
179 NA, NA, NA, NA, NA, NA, NA, NA,
180 NA, NA, NA, NA, NA, NA, NA, NA,
181};
182#undef BS
183#undef CC
184#undef CR
185#undef NA
186#undef NL
187#undef NO
188#undef TB
189#undef VT
190
191/* Macros to clear/set/test flags. */
192#define SET(t, f) (t) |= (f)
193#define CLR(t, f) (t) &= ~(f)
194#define ISSET(t, f) ((t) & (f))
195
196#undef MAX_INPUT /* XXX wrong in <sys/syslimits.h> */
197#define MAX_INPUT TTYHOG /* XXX limit is usually larger for !ICANON */
198
199/*
200 * list of struct tty where pstat(8) can pick it up with sysctl
201 */
202static SLIST_HEAD(, tty) tty_list;
203
204/*
205 * Initial open of tty, or (re)entry to standard tty line discipline.
206 */
207int
208ttyopen(device, tp)
209 dev_t device;
210 register struct tty *tp;
211{
212 int s;
213
214 s = spltty();
215 tp->t_dev = device;
216 if (!ISSET(tp->t_state, TS_ISOPEN)) {
217 SET(tp->t_state, TS_ISOPEN);
218 if (ISSET(tp->t_cflag, CLOCAL))
219 SET(tp->t_state, TS_CONNECTED);
220 bzero(&tp->t_winsize, sizeof(tp->t_winsize));
221 }
222 ttsetwater(tp);
223 splx(s);
224 return (0);
225}
226
227/*
228 * Handle close() on a tty line: flush and set to initial state,
229 * bumping generation number so that pending read/write calls
230 * can detect recycling of the tty.
231 * XXX our caller should have done `spltty(); l_close(); ttyclose();'
232 * and l_close() should have flushed, but we repeat the spltty() and
233 * the flush in case there are buggy callers.
234 */
235int
236ttyclose(tp)
237 register struct tty *tp;
238{
239 int s;
240
241 funsetown(tp->t_sigio);
242 s = spltty();
243 if (constty == tp)
244 constty = NULL;
245
246 ttyflush(tp, FREAD | FWRITE);
247 clist_free_cblocks(&tp->t_canq);
248 clist_free_cblocks(&tp->t_outq);
249 clist_free_cblocks(&tp->t_rawq);
250
251 tp->t_gen++;
252 tp->t_line = TTYDISC;
253 tp->t_pgrp = NULL;
254 tp->t_session = NULL;
255 tp->t_state = 0;
256 splx(s);
257 return (0);
258}
259
260#define FLUSHQ(q) { \
261 if ((q)->c_cc) \
262 ndflush(q, (q)->c_cc); \
263}
264
265/* Is 'c' a line delimiter ("break" character)? */
266#define TTBREAKC(c, lflag) \
267 ((c) == '\n' || (((c) == cc[VEOF] || \
268 (c) == cc[VEOL] || ((c) == cc[VEOL2] && lflag & IEXTEN)) && \
269 (c) != _POSIX_VDISABLE))
270
271/*
272 * Process input of a single character received on a tty.
273 */
274int
275ttyinput(c, tp)
276 register int c;
277 register struct tty *tp;
278{
279 register tcflag_t iflag, lflag;
280 register cc_t *cc;
281 int i, err;
282
283 /*
284 * If input is pending take it first.
285 */
286 lflag = tp->t_lflag;
287 if (ISSET(lflag, PENDIN))
288 ttypend(tp);
289 /*
290 * Gather stats.
291 */
292 if (ISSET(lflag, ICANON)) {
293 ++tk_cancc;
294 ++tp->t_cancc;
295 } else {
296 ++tk_rawcc;
297 ++tp->t_rawcc;
298 }
299 ++tk_nin;
300
301 /*
302 * Block further input iff:
303 * current input > threshold AND input is available to user program
304 * AND input flow control is enabled and not yet invoked.
305 * The 3 is slop for PARMRK.
306 */
307 iflag = tp->t_iflag;
308 if (tp->t_rawq.c_cc + tp->t_canq.c_cc > tp->t_ihiwat - 3 &&
309 (!ISSET(lflag, ICANON) || tp->t_canq.c_cc != 0) &&
310 (ISSET(tp->t_cflag, CRTS_IFLOW) || ISSET(iflag, IXOFF)) &&
311 !ISSET(tp->t_state, TS_TBLOCK))
312 ttyblock(tp);
313
314 /* Handle exceptional conditions (break, parity, framing). */
315 cc = tp->t_cc;
316 err = (ISSET(c, TTY_ERRORMASK));
317 if (err) {
318 CLR(c, TTY_ERRORMASK);
319 if (ISSET(err, TTY_BI)) {
320 if (ISSET(iflag, IGNBRK))
321 return (0);
322 if (ISSET(iflag, BRKINT)) {
323 ttyflush(tp, FREAD | FWRITE);
324 pgsignal(tp->t_pgrp, SIGINT, 1);
325 goto endcase;
326 }
327 if (ISSET(iflag, PARMRK))
328 goto parmrk;
329 } else if ((ISSET(err, TTY_PE) && ISSET(iflag, INPCK))
330 || ISSET(err, TTY_FE)) {
331 if (ISSET(iflag, IGNPAR))
332 return (0);
333 else if (ISSET(iflag, PARMRK)) {
334parmrk:
335 if (tp->t_rawq.c_cc + tp->t_canq.c_cc >
336 MAX_INPUT - 3)
337 goto input_overflow;
338 (void)putc(0377 | TTY_QUOTE, &tp->t_rawq);
339 (void)putc(0 | TTY_QUOTE, &tp->t_rawq);
340 (void)putc(c | TTY_QUOTE, &tp->t_rawq);
341 goto endcase;
342 } else
343 c = 0;
344 }
345 }
346
347 if (!ISSET(tp->t_state, TS_TYPEN) && ISSET(iflag, ISTRIP))
348 CLR(c, 0x80);
349 if (!ISSET(lflag, EXTPROC)) {
350 /*
351 * Check for literal nexting very first
352 */
353 if (ISSET(tp->t_state, TS_LNCH)) {
354 SET(c, TTY_QUOTE);
355 CLR(tp->t_state, TS_LNCH);
356 }
357 /*
358 * Scan for special characters. This code
359 * is really just a big case statement with
360 * non-constant cases. The bottom of the
361 * case statement is labeled ``endcase'', so goto
362 * it after a case match, or similar.
363 */
364
365 /*
366 * Control chars which aren't controlled
367 * by ICANON, ISIG, or IXON.
368 */
369 if (ISSET(lflag, IEXTEN)) {
370 if (CCEQ(cc[VLNEXT], c)) {
371 if (ISSET(lflag, ECHO)) {
372 if (ISSET(lflag, ECHOE)) {
373 (void)ttyoutput('^', tp);
374 (void)ttyoutput('\b', tp);
375 } else
376 ttyecho(c, tp);
377 }
378 SET(tp->t_state, TS_LNCH);
379 goto endcase;
380 }
381 if (CCEQ(cc[VDISCARD], c)) {
382 if (ISSET(lflag, FLUSHO))
383 CLR(tp->t_lflag, FLUSHO);
384 else {
385 ttyflush(tp, FWRITE);
386 ttyecho(c, tp);
387 if (tp->t_rawq.c_cc + tp->t_canq.c_cc)
388 ttyretype(tp);
389 SET(tp->t_lflag, FLUSHO);
390 }
391 goto startoutput;
392 }
393 }
394 /*
395 * Signals.
396 */
397 if (ISSET(lflag, ISIG)) {
398 if (CCEQ(cc[VINTR], c) || CCEQ(cc[VQUIT], c)) {
399 if (!ISSET(lflag, NOFLSH))
400 ttyflush(tp, FREAD | FWRITE);
401 ttyecho(c, tp);
402 pgsignal(tp->t_pgrp,
403 CCEQ(cc[VINTR], c) ? SIGINT : SIGQUIT, 1);
404 goto endcase;
405 }
406 if (CCEQ(cc[VSUSP], c)) {
407 if (!ISSET(lflag, NOFLSH))
408 ttyflush(tp, FREAD);
409 ttyecho(c, tp);
410 pgsignal(tp->t_pgrp, SIGTSTP, 1);
411 goto endcase;
412 }
413 }
414 /*
415 * Handle start/stop characters.
416 */
417 if (ISSET(iflag, IXON)) {
418 if (CCEQ(cc[VSTOP], c)) {
419 if (!ISSET(tp->t_state, TS_TTSTOP)) {
420 SET(tp->t_state, TS_TTSTOP);
421 (*tp->t_stop)(tp, 0);
422 return (0);
423 }
424 if (!CCEQ(cc[VSTART], c))
425 return (0);
426 /*
427 * if VSTART == VSTOP then toggle
428 */
429 goto endcase;
430 }
431 if (CCEQ(cc[VSTART], c))
432 goto restartoutput;
433 }
434 /*
435 * IGNCR, ICRNL, & INLCR
436 */
437 if (c == '\r') {
438 if (ISSET(iflag, IGNCR))
439 return (0);
440 else if (ISSET(iflag, ICRNL))
441 c = '\n';
442 } else if (c == '\n' && ISSET(iflag, INLCR))
443 c = '\r';
444 }
445 if (!ISSET(tp->t_lflag, EXTPROC) && ISSET(lflag, ICANON)) {
446 /*
447 * From here on down canonical mode character
448 * processing takes place.
449 */
450 /*
451 * erase or erase2 (^H / ^?)
452 */
453 if (CCEQ(cc[VERASE], c) || CCEQ(cc[VERASE2], c) ) {
454 if (tp->t_rawq.c_cc)
455 ttyrub(unputc(&tp->t_rawq), tp);
456 goto endcase;
457 }
458 /*
459 * kill (^U)
460 */
461 if (CCEQ(cc[VKILL], c)) {
462 if (ISSET(lflag, ECHOKE) &&
463 tp->t_rawq.c_cc == tp->t_rocount &&
464 !ISSET(lflag, ECHOPRT))
465 while (tp->t_rawq.c_cc)
466 ttyrub(unputc(&tp->t_rawq), tp);
467 else {
468 ttyecho(c, tp);
469 if (ISSET(lflag, ECHOK) ||
470 ISSET(lflag, ECHOKE))
471 ttyecho('\n', tp);
472 FLUSHQ(&tp->t_rawq);
473 tp->t_rocount = 0;
474 }
475 CLR(tp->t_state, TS_LOCAL);
476 goto endcase;
477 }
478 /*
479 * word erase (^W)
480 */
481 if (CCEQ(cc[VWERASE], c) && ISSET(lflag, IEXTEN)) {
482 int ctype;
483
484 /*
485 * erase whitespace
486 */
487 while ((c = unputc(&tp->t_rawq)) == ' ' || c == '\t')
488 ttyrub(c, tp);
489 if (c == -1)
490 goto endcase;
491 /*
492 * erase last char of word and remember the
493 * next chars type (for ALTWERASE)
494 */
495 ttyrub(c, tp);
496 c = unputc(&tp->t_rawq);
497 if (c == -1)
498 goto endcase;
499 if (c == ' ' || c == '\t') {
500 (void)putc(c, &tp->t_rawq);
501 goto endcase;
502 }
503 ctype = ISALPHA(c);
504 /*
505 * erase rest of word
506 */
507 do {
508 ttyrub(c, tp);
509 c = unputc(&tp->t_rawq);
510 if (c == -1)
511 goto endcase;
512 } while (c != ' ' && c != '\t' &&
513 (!ISSET(lflag, ALTWERASE) || ISALPHA(c) == ctype));
514 (void)putc(c, &tp->t_rawq);
515 goto endcase;
516 }
517 /*
518 * reprint line (^R)
519 */
520 if (CCEQ(cc[VREPRINT], c) && ISSET(lflag, IEXTEN)) {
521 ttyretype(tp);
522 goto endcase;
523 }
524 /*
525 * ^T - kernel info and generate SIGINFO
526 */
527 if (CCEQ(cc[VSTATUS], c) && ISSET(lflag, IEXTEN)) {
528 if (ISSET(lflag, ISIG))
529 pgsignal(tp->t_pgrp, SIGINFO, 1);
530 if (!ISSET(lflag, NOKERNINFO))
531 ttyinfo(tp);
532 goto endcase;
533 }
534 }
535 /*
536 * Check for input buffer overflow
537 */
538 if (tp->t_rawq.c_cc + tp->t_canq.c_cc >= MAX_INPUT) {
539input_overflow:
540 if (ISSET(iflag, IMAXBEL)) {
541 if (tp->t_outq.c_cc < tp->t_ohiwat)
542 (void)ttyoutput(CTRL('g'), tp);
543 }
544 goto endcase;
545 }
546
547 if ( c == 0377 && ISSET(iflag, PARMRK) && !ISSET(iflag, ISTRIP)
548 && ISSET(iflag, IGNBRK|IGNPAR) != (IGNBRK|IGNPAR))
549 (void)putc(0377 | TTY_QUOTE, &tp->t_rawq);
550
551 /*
552 * Put data char in q for user and
553 * wakeup on seeing a line delimiter.
554 */
555 if (putc(c, &tp->t_rawq) >= 0) {
556 if (!ISSET(lflag, ICANON)) {
557 ttwakeup(tp);
558 ttyecho(c, tp);
559 goto endcase;
560 }
561 if (TTBREAKC(c, lflag)) {
562 tp->t_rocount = 0;
563 catq(&tp->t_rawq, &tp->t_canq);
564 ttwakeup(tp);
565 } else if (tp->t_rocount++ == 0)
566 tp->t_rocol = tp->t_column;
567 if (ISSET(tp->t_state, TS_ERASE)) {
568 /*
569 * end of prterase \.../
570 */
571 CLR(tp->t_state, TS_ERASE);
572 (void)ttyoutput('/', tp);
573 }
574 i = tp->t_column;
575 ttyecho(c, tp);
576 if (CCEQ(cc[VEOF], c) && ISSET(lflag, ECHO)) {
577 /*
578 * Place the cursor over the '^' of the ^D.
579 */
580 i = imin(2, tp->t_column - i);
581 while (i > 0) {
582 (void)ttyoutput('\b', tp);
583 i--;
584 }
585 }
586 }
587endcase:
588 /*
589 * IXANY means allow any character to restart output.
590 */
591 if (ISSET(tp->t_state, TS_TTSTOP) &&
592 !ISSET(iflag, IXANY) && cc[VSTART] != cc[VSTOP])
593 return (0);
594restartoutput:
595 CLR(tp->t_lflag, FLUSHO);
596 CLR(tp->t_state, TS_TTSTOP);
597startoutput:
598 return (ttstart(tp));
599}
600
601/*
602 * Output a single character on a tty, doing output processing
603 * as needed (expanding tabs, newline processing, etc.).
604 * Returns < 0 if succeeds, otherwise returns char to resend.
605 * Must be recursive.
606 */
607static int
608ttyoutput(c, tp)
609 register int c;
610 register struct tty *tp;
611{
612 register tcflag_t oflag;
613 register int col, s;
614
615 oflag = tp->t_oflag;
616 if (!ISSET(oflag, OPOST)) {
617 if (ISSET(tp->t_lflag, FLUSHO))
618 return (-1);
619 if (putc(c, &tp->t_outq))
620 return (c);
621 tk_nout++;
622 tp->t_outcc++;
623 return (-1);
624 }
625 /*
626 * Do tab expansion if OXTABS is set. Special case if we external
627 * processing, we don't do the tab expansion because we'll probably
628 * get it wrong. If tab expansion needs to be done, let it happen
629 * externally.
630 */
631 CLR(c, ~TTY_CHARMASK);
632 if (c == '\t' &&
633 ISSET(oflag, OXTABS) && !ISSET(tp->t_lflag, EXTPROC)) {
634 c = 8 - (tp->t_column & 7);
635 if (!ISSET(tp->t_lflag, FLUSHO)) {
636 s = spltty(); /* Don't interrupt tabs. */
637 c -= b_to_q(" ", c, &tp->t_outq);
638 tk_nout += c;
639 tp->t_outcc += c;
640 splx(s);
641 }
642 tp->t_column += c;
643 return (c ? -1 : '\t');
644 }
645 if (c == CEOT && ISSET(oflag, ONOEOT))
646 return (-1);
647
648 /*
649 * Newline translation: if ONLCR is set,
650 * translate newline into "\r\n".
651 */
652 if (c == '\n' && ISSET(tp->t_oflag, ONLCR)) {
653 tk_nout++;
654 tp->t_outcc++;
655 if (!ISSET(tp->t_lflag, FLUSHO) && putc('\r', &tp->t_outq))
656 return (c);
657 }
658 /* If OCRNL is set, translate "\r" into "\n". */
659 else if (c == '\r' && ISSET(tp->t_oflag, OCRNL))
660 c = '\n';
661 /* If ONOCR is set, don't transmit CRs when on column 0. */
662 else if (c == '\r' && ISSET(tp->t_oflag, ONOCR) && tp->t_column == 0)
663 return (-1);
664
665 tk_nout++;
666 tp->t_outcc++;
667 if (!ISSET(tp->t_lflag, FLUSHO) && putc(c, &tp->t_outq))
668 return (c);
669
670 col = tp->t_column;
671 switch (CCLASS(c)) {
672 case BACKSPACE:
673 if (col > 0)
674 --col;
675 break;
676 case CONTROL:
677 break;
678 case NEWLINE:
679 if (ISSET(tp->t_oflag, ONLCR | ONLRET))
680 col = 0;
681 break;
682 case RETURN:
683 col = 0;
684 break;
685 case ORDINARY:
686 ++col;
687 break;
688 case TAB:
689 col = (col + 8) & ~7;
690 break;
691 }
692 tp->t_column = col;
693 return (-1);
694}
695
696/*
697 * Ioctls for all tty devices. Called after line-discipline specific ioctl
698 * has been called to do discipline-specific functions and/or reject any
699 * of these ioctl commands.
700 */
701/* ARGSUSED */
702int
dadab5e9 703ttioctl(struct tty *tp, u_long cmd, void *data, int flag)
984263bc 704{
dadab5e9
MD
705 struct thread *td = curthread;
706 struct proc *p = td->td_proc;
984263bc
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707 int s, error;
708
dadab5e9
MD
709 KKASSERT(p);
710
984263bc
MD
711 /* If the ioctl involves modification, hang if in the background. */
712 switch (cmd) {
713 case TIOCCBRK:
714 case TIOCCONS:
715 case TIOCDRAIN:
716 case TIOCEXCL:
717 case TIOCFLUSH:
718#ifdef TIOCHPCL
719 case TIOCHPCL:
720#endif
721 case TIOCNXCL:
722 case TIOCSBRK:
723 case TIOCSCTTY:
724 case TIOCSDRAINWAIT:
725 case TIOCSETA:
726 case TIOCSETAF:
727 case TIOCSETAW:
728 case TIOCSETD:
729 case TIOCSPGRP:
730 case TIOCSTART:
731 case TIOCSTAT:
732 case TIOCSTI:
733 case TIOCSTOP:
734 case TIOCSWINSZ:
735#if defined(COMPAT_43) || defined(COMPAT_SUNOS)
736 case TIOCLBIC:
737 case TIOCLBIS:
738 case TIOCLSET:
739 case TIOCSETC:
740 case OTIOCSETD:
741 case TIOCSETN:
742 case TIOCSETP:
743 case TIOCSLTC:
744#endif
745 while (isbackground(p, tp) && !(p->p_flag & P_PPWAIT) &&
746 !SIGISMEMBER(p->p_sigignore, SIGTTOU) &&
747 !SIGISMEMBER(p->p_sigmask, SIGTTOU)) {
748 if (p->p_pgrp->pg_jobc == 0)
749 return (EIO);
750 pgsignal(p->p_pgrp, SIGTTOU, 1);
751 error = ttysleep(tp, &lbolt, TTOPRI | PCATCH, "ttybg1",
752 0);
753 if (error)
754 return (error);
755 }
756 break;
757 }
758
759 switch (cmd) { /* Process the ioctl. */
760 case FIOASYNC: /* set/clear async i/o */
761 s = spltty();
762 if (*(int *)data)
763 SET(tp->t_state, TS_ASYNC);
764 else
765 CLR(tp->t_state, TS_ASYNC);
766 splx(s);
767 break;
768 case FIONBIO: /* set/clear non-blocking i/o */
769 break; /* XXX: delete. */
770 case FIONREAD: /* get # bytes to read */
771 s = spltty();
772 *(int *)data = ttnread(tp);
773 splx(s);
774 break;
775
776 case FIOSETOWN:
777 /*
778 * Policy -- Don't allow FIOSETOWN on someone else's
779 * controlling tty
780 */
781 if (tp->t_session != NULL && !isctty(p, tp))
782 return (ENOTTY);
783
784 error = fsetown(*(int *)data, &tp->t_sigio);
785 if (error)
786 return (error);
787 break;
788 case FIOGETOWN:
789 if (tp->t_session != NULL && !isctty(p, tp))
790 return (ENOTTY);
791 *(int *)data = fgetown(tp->t_sigio);
792 break;
793
794 case TIOCEXCL: /* set exclusive use of tty */
795 s = spltty();
796 SET(tp->t_state, TS_XCLUDE);
797 splx(s);
798 break;
799 case TIOCFLUSH: { /* flush buffers */
800 register int flags = *(int *)data;
801
802 if (flags == 0)
803 flags = FREAD | FWRITE;
804 else
805 flags &= FREAD | FWRITE;
806 ttyflush(tp, flags);
807 break;
808 }
809 case TIOCCONS: /* become virtual console */
810 if (*(int *)data) {
811 if (constty && constty != tp &&
812 ISSET(constty->t_state, TS_CONNECTED))
813 return (EBUSY);
814#ifndef UCONSOLE
dadab5e9 815 if ((error = suser(td)) != 0)
984263bc
MD
816 return (error);
817#endif
818 constty = tp;
819 } else if (tp == constty)
820 constty = NULL;
821 break;
822 case TIOCDRAIN: /* wait till output drained */
823 error = ttywait(tp);
824 if (error)
825 return (error);
826 break;
827 case TIOCGETA: { /* get termios struct */
828 struct termios *t = (struct termios *)data;
829
830 bcopy(&tp->t_termios, t, sizeof(struct termios));
831 break;
832 }
833 case TIOCGETD: /* get line discipline */
834 *(int *)data = tp->t_line;
835 break;
836 case TIOCGWINSZ: /* get window size */
837 *(struct winsize *)data = tp->t_winsize;
838 break;
839 case TIOCGPGRP: /* get pgrp of tty */
840 if (!isctty(p, tp))
841 return (ENOTTY);
842 *(int *)data = tp->t_pgrp ? tp->t_pgrp->pg_id : NO_PID;
843 break;
844#ifdef TIOCHPCL
845 case TIOCHPCL: /* hang up on last close */
846 s = spltty();
847 SET(tp->t_cflag, HUPCL);
848 splx(s);
849 break;
850#endif
851 case TIOCNXCL: /* reset exclusive use of tty */
852 s = spltty();
853 CLR(tp->t_state, TS_XCLUDE);
854 splx(s);
855 break;
856 case TIOCOUTQ: /* output queue size */
857 *(int *)data = tp->t_outq.c_cc;
858 break;
859 case TIOCSETA: /* set termios struct */
860 case TIOCSETAW: /* drain output, set */
861 case TIOCSETAF: { /* drn out, fls in, set */
862 register struct termios *t = (struct termios *)data;
863
864 if (t->c_ispeed == 0)
865 t->c_ispeed = t->c_ospeed;
866 if (t->c_ispeed == 0)
867 t->c_ispeed = tp->t_ospeed;
868 if (t->c_ispeed == 0)
869 return (EINVAL);
870 s = spltty();
871 if (cmd == TIOCSETAW || cmd == TIOCSETAF) {
872 error = ttywait(tp);
873 if (error) {
874 splx(s);
875 return (error);
876 }
877 if (cmd == TIOCSETAF)
878 ttyflush(tp, FREAD);
879 }
880 if (!ISSET(t->c_cflag, CIGNORE)) {
881 /*
882 * Set device hardware.
883 */
884 if (tp->t_param && (error = (*tp->t_param)(tp, t))) {
885 splx(s);
886 return (error);
887 }
888 if (ISSET(t->c_cflag, CLOCAL) &&
889 !ISSET(tp->t_cflag, CLOCAL)) {
890 /*
891 * XXX disconnections would be too hard to
892 * get rid of without this kludge. The only
893 * way to get rid of controlling terminals
894 * is to exit from the session leader.
895 */
896 CLR(tp->t_state, TS_ZOMBIE);
897
898 wakeup(TSA_CARR_ON(tp));
899 ttwakeup(tp);
900 ttwwakeup(tp);
901 }
902 if ((ISSET(tp->t_state, TS_CARR_ON) ||
903 ISSET(t->c_cflag, CLOCAL)) &&
904 !ISSET(tp->t_state, TS_ZOMBIE))
905 SET(tp->t_state, TS_CONNECTED);
906 else
907 CLR(tp->t_state, TS_CONNECTED);
908 tp->t_cflag = t->c_cflag;
909 tp->t_ispeed = t->c_ispeed;
910 if (t->c_ospeed != 0)
911 tp->t_ospeed = t->c_ospeed;
912 ttsetwater(tp);
913 }
914 if (ISSET(t->c_lflag, ICANON) != ISSET(tp->t_lflag, ICANON) &&
915 cmd != TIOCSETAF) {
916 if (ISSET(t->c_lflag, ICANON))
917 SET(tp->t_lflag, PENDIN);
918 else {
919 /*
920 * XXX we really shouldn't allow toggling
921 * ICANON while we're in a non-termios line
922 * discipline. Now we have to worry about
923 * panicing for a null queue.
924 */
925 if (tp->t_canq.c_cbreserved > 0 &&
926 tp->t_rawq.c_cbreserved > 0) {
927 catq(&tp->t_rawq, &tp->t_canq);
928 /*
929 * XXX the queue limits may be
930 * different, so the old queue
931 * swapping method no longer works.
932 */
933 catq(&tp->t_canq, &tp->t_rawq);
934 }
935 CLR(tp->t_lflag, PENDIN);
936 }
937 ttwakeup(tp);
938 }
939 tp->t_iflag = t->c_iflag;
940 tp->t_oflag = t->c_oflag;
941 /*
942 * Make the EXTPROC bit read only.
943 */
944 if (ISSET(tp->t_lflag, EXTPROC))
945 SET(t->c_lflag, EXTPROC);
946 else
947 CLR(t->c_lflag, EXTPROC);
948 tp->t_lflag = t->c_lflag | ISSET(tp->t_lflag, PENDIN);
949 if (t->c_cc[VMIN] != tp->t_cc[VMIN] ||
950 t->c_cc[VTIME] != tp->t_cc[VTIME])
951 ttwakeup(tp);
952 bcopy(t->c_cc, tp->t_cc, sizeof(t->c_cc));
953 splx(s);
954 break;
955 }
956 case TIOCSETD: { /* set line discipline */
957 register int t = *(int *)data;
958 dev_t device = tp->t_dev;
959
960 if ((u_int)t >= nlinesw)
961 return (ENXIO);
962 if (t != tp->t_line) {
963 s = spltty();
964 (*linesw[tp->t_line].l_close)(tp, flag);
965 error = (*linesw[t].l_open)(device, tp);
966 if (error) {
967 (void)(*linesw[tp->t_line].l_open)(device, tp);
968 splx(s);
969 return (error);
970 }
971 tp->t_line = t;
972 splx(s);
973 }
974 break;
975 }
976 case TIOCSTART: /* start output, like ^Q */
977 s = spltty();
978 if (ISSET(tp->t_state, TS_TTSTOP) ||
979 ISSET(tp->t_lflag, FLUSHO)) {
980 CLR(tp->t_lflag, FLUSHO);
981 CLR(tp->t_state, TS_TTSTOP);
982 ttstart(tp);
983 }
984 splx(s);
985 break;
986 case TIOCSTI: /* simulate terminal input */
dadab5e9 987 if ((flag & FREAD) == 0 && suser(td))
984263bc 988 return (EPERM);
dadab5e9 989 if (!isctty(p, tp) && suser(td))
984263bc
MD
990 return (EACCES);
991 s = spltty();
992 (*linesw[tp->t_line].l_rint)(*(u_char *)data, tp);
993 splx(s);
994 break;
995 case TIOCSTOP: /* stop output, like ^S */
996 s = spltty();
997 if (!ISSET(tp->t_state, TS_TTSTOP)) {
998 SET(tp->t_state, TS_TTSTOP);
999 (*tp->t_stop)(tp, 0);
1000 }
1001 splx(s);
1002 break;
1003 case TIOCSCTTY: /* become controlling tty */
1004 /* Session ctty vnode pointer set in vnode layer. */
1005 if (!SESS_LEADER(p) ||
1006 ((p->p_session->s_ttyvp || tp->t_session) &&
1007 (tp->t_session != p->p_session)))
1008 return (EPERM);
1009 tp->t_session = p->p_session;
1010 tp->t_pgrp = p->p_pgrp;
1011 p->p_session->s_ttyp = tp;
1012 p->p_flag |= P_CONTROLT;
1013 break;
1014 case TIOCSPGRP: { /* set pgrp of tty */
1015 register struct pgrp *pgrp = pgfind(*(int *)data);
1016
1017 if (!isctty(p, tp))
1018 return (ENOTTY);
1019 else if (pgrp == NULL || pgrp->pg_session != p->p_session)
1020 return (EPERM);
1021 tp->t_pgrp = pgrp;
1022 break;
1023 }
1024 case TIOCSTAT: /* simulate control-T */
1025 s = spltty();
1026 ttyinfo(tp);
1027 splx(s);
1028 break;
1029 case TIOCSWINSZ: /* set window size */
1030 if (bcmp((caddr_t)&tp->t_winsize, data,
1031 sizeof (struct winsize))) {
1032 tp->t_winsize = *(struct winsize *)data;
1033 pgsignal(tp->t_pgrp, SIGWINCH, 1);
1034 }
1035 break;
1036 case TIOCSDRAINWAIT:
dadab5e9 1037 error = suser(td);
984263bc
MD
1038 if (error)
1039 return (error);
1040 tp->t_timeout = *(int *)data * hz;
1041 wakeup(TSA_OCOMPLETE(tp));
1042 wakeup(TSA_OLOWAT(tp));
1043 break;
1044 case TIOCGDRAINWAIT:
1045 *(int *)data = tp->t_timeout / hz;
1046 break;
1047 default:
1048#if defined(COMPAT_43) || defined(COMPAT_SUNOS)
1049 return (ttcompat(tp, cmd, data, flag));
1050#else
1051 return (ENOIOCTL);
1052#endif
1053 }
1054 return (0);
1055}
1056
1057int
41c20dac 1058ttypoll(dev, events, td)
984263bc
MD
1059 dev_t dev;
1060 int events;
41c20dac 1061 struct thread *td;
984263bc
MD
1062{
1063 int s;
1064 int revents = 0;
1065 struct tty *tp;
1066
1067 tp = dev->si_tty;
1068 if (tp == NULL) /* XXX used to return ENXIO, but that means true! */
1069 return ((events & (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM))
1070 | POLLHUP);
1071
1072 s = spltty();
1073 if (events & (POLLIN | POLLRDNORM)) {
1074 if (ttnread(tp) > 0 || ISSET(tp->t_state, TS_ZOMBIE))
1075 revents |= events & (POLLIN | POLLRDNORM);
1076 else
41c20dac 1077 selrecord(td, &tp->t_rsel);
984263bc
MD
1078 }
1079 if (events & (POLLOUT | POLLWRNORM)) {
1080 if ((tp->t_outq.c_cc <= tp->t_olowat &&
1081 ISSET(tp->t_state, TS_CONNECTED))
1082 || ISSET(tp->t_state, TS_ZOMBIE))
1083 revents |= events & (POLLOUT | POLLWRNORM);
1084 else
41c20dac 1085 selrecord(td, &tp->t_wsel);
984263bc
MD
1086 }
1087 splx(s);
1088 return (revents);
1089}
1090
1091static struct filterops ttyread_filtops =
1092 { 1, NULL, filt_ttyrdetach, filt_ttyread };
1093static struct filterops ttywrite_filtops =
1094 { 1, NULL, filt_ttywdetach, filt_ttywrite };
1095
1096int
1097ttykqfilter(dev, kn)
1098 dev_t dev;
1099 struct knote *kn;
1100{
1101 struct tty *tp = dev->si_tty;
1102 struct klist *klist;
1103 int s;
1104
1105 switch (kn->kn_filter) {
1106 case EVFILT_READ:
1107 klist = &tp->t_rsel.si_note;
1108 kn->kn_fop = &ttyread_filtops;
1109 break;
1110 case EVFILT_WRITE:
1111 klist = &tp->t_wsel.si_note;
1112 kn->kn_fop = &ttywrite_filtops;
1113 break;
1114 default:
1115 return (1);
1116 }
1117
1118 kn->kn_hook = (caddr_t)dev;
1119
1120 s = spltty();
1121 SLIST_INSERT_HEAD(klist, kn, kn_selnext);
1122 splx(s);
1123
1124 return (0);
1125}
1126
1127static void
1128filt_ttyrdetach(struct knote *kn)
1129{
1130 struct tty *tp = ((dev_t)kn->kn_hook)->si_tty;
1131 int s = spltty();
1132
1133 SLIST_REMOVE(&tp->t_rsel.si_note, kn, knote, kn_selnext);
1134 splx(s);
1135}
1136
1137static int
1138filt_ttyread(struct knote *kn, long hint)
1139{
1140 struct tty *tp = ((dev_t)kn->kn_hook)->si_tty;
1141
1142 kn->kn_data = ttnread(tp);
1143 if (ISSET(tp->t_state, TS_ZOMBIE)) {
1144 kn->kn_flags |= EV_EOF;
1145 return (1);
1146 }
1147 return (kn->kn_data > 0);
1148}
1149
1150static void
1151filt_ttywdetach(struct knote *kn)
1152{
1153 struct tty *tp = ((dev_t)kn->kn_hook)->si_tty;
1154 int s = spltty();
1155
1156 SLIST_REMOVE(&tp->t_wsel.si_note, kn, knote, kn_selnext);
1157 splx(s);
1158}
1159
1160static int
1161filt_ttywrite(kn, hint)
1162 struct knote *kn;
1163 long hint;
1164{
1165 struct tty *tp = ((dev_t)kn->kn_hook)->si_tty;
1166
1167 kn->kn_data = tp->t_outq.c_cc;
1168 if (ISSET(tp->t_state, TS_ZOMBIE))
1169 return (1);
1170 return (kn->kn_data <= tp->t_olowat &&
1171 ISSET(tp->t_state, TS_CONNECTED));
1172}
1173
1174/*
1175 * Must be called at spltty().
1176 */
1177static int
1178ttnread(tp)
1179 struct tty *tp;
1180{
1181 int nread;
1182
1183 if (ISSET(tp->t_lflag, PENDIN))
1184 ttypend(tp);
1185 nread = tp->t_canq.c_cc;
1186 if (!ISSET(tp->t_lflag, ICANON)) {
1187 nread += tp->t_rawq.c_cc;
1188 if (nread < tp->t_cc[VMIN] && tp->t_cc[VTIME] == 0)
1189 nread = 0;
1190 }
1191 return (nread);
1192}
1193
1194/*
1195 * Wait for output to drain.
1196 */
1197int
1198ttywait(tp)
1199 register struct tty *tp;
1200{
1201 int error, s;
1202
1203 error = 0;
1204 s = spltty();
1205 while ((tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY)) &&
1206 ISSET(tp->t_state, TS_CONNECTED) && tp->t_oproc) {
1207 (*tp->t_oproc)(tp);
1208 if ((tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY)) &&
1209 ISSET(tp->t_state, TS_CONNECTED)) {
1210 SET(tp->t_state, TS_SO_OCOMPLETE);
1211 error = ttysleep(tp, TSA_OCOMPLETE(tp),
1212 TTOPRI | PCATCH, "ttywai",
1213 tp->t_timeout);
1214 if (error) {
1215 if (error == EWOULDBLOCK)
1216 error = EIO;
1217 break;
1218 }
1219 } else
1220 break;
1221 }
1222 if (!error && (tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY)))
1223 error = EIO;
1224 splx(s);
1225 return (error);
1226}
1227
1228/*
1229 * Flush if successfully wait.
1230 */
1231static int
1232ttywflush(tp)
1233 struct tty *tp;
1234{
1235 int error;
1236
1237 if ((error = ttywait(tp)) == 0)
1238 ttyflush(tp, FREAD);
1239 return (error);
1240}
1241
1242/*
1243 * Flush tty read and/or write queues, notifying anyone waiting.
1244 */
1245void
1246ttyflush(tp, rw)
1247 register struct tty *tp;
1248 int rw;
1249{
1250 register int s;
1251
1252 s = spltty();
1253#if 0
1254again:
1255#endif
1256 if (rw & FWRITE) {
1257 FLUSHQ(&tp->t_outq);
1258 CLR(tp->t_state, TS_TTSTOP);
1259 }
1260 (*tp->t_stop)(tp, rw);
1261 if (rw & FREAD) {
1262 FLUSHQ(&tp->t_canq);
1263 FLUSHQ(&tp->t_rawq);
1264 CLR(tp->t_lflag, PENDIN);
1265 tp->t_rocount = 0;
1266 tp->t_rocol = 0;
1267 CLR(tp->t_state, TS_LOCAL);
1268 ttwakeup(tp);
1269 if (ISSET(tp->t_state, TS_TBLOCK)) {
1270 if (rw & FWRITE)
1271 FLUSHQ(&tp->t_outq);
1272 ttyunblock(tp);
1273
1274 /*
1275 * Don't let leave any state that might clobber the
1276 * next line discipline (although we should do more
1277 * to send the START char). Not clearing the state
1278 * may have caused the "putc to a clist with no
1279 * reserved cblocks" panic/printf.
1280 */
1281 CLR(tp->t_state, TS_TBLOCK);
1282
1283#if 0 /* forget it, sleeping isn't always safe and we don't know when it is */
1284 if (ISSET(tp->t_iflag, IXOFF)) {
1285 /*
1286 * XXX wait a bit in the hope that the stop
1287 * character (if any) will go out. Waiting
1288 * isn't good since it allows races. This
1289 * will be fixed when the stop character is
1290 * put in a special queue. Don't bother with
1291 * the checks in ttywait() since the timeout
1292 * will save us.
1293 */
1294 SET(tp->t_state, TS_SO_OCOMPLETE);
1295 ttysleep(tp, TSA_OCOMPLETE(tp), TTOPRI,
1296 "ttyfls", hz / 10);
1297 /*
1298 * Don't try sending the stop character again.
1299 */
1300 CLR(tp->t_state, TS_TBLOCK);
1301 goto again;
1302 }
1303#endif
1304 }
1305 }
1306 if (rw & FWRITE) {
1307 FLUSHQ(&tp->t_outq);
1308 ttwwakeup(tp);
1309 }
1310 splx(s);
1311}
1312
1313/*
1314 * Copy in the default termios characters.
1315 */
1316void
1317termioschars(t)
1318 struct termios *t;
1319{
1320
1321 bcopy(ttydefchars, t->c_cc, sizeof t->c_cc);
1322}
1323
1324/*
1325 * Old interface.
1326 */
1327void
1328ttychars(tp)
1329 struct tty *tp;
1330{
1331
1332 termioschars(&tp->t_termios);
1333}
1334
1335/*
1336 * Handle input high water. Send stop character for the IXOFF case. Turn
1337 * on our input flow control bit and propagate the changes to the driver.
1338 * XXX the stop character should be put in a special high priority queue.
1339 */
1340void
1341ttyblock(tp)
1342 struct tty *tp;
1343{
1344
1345 SET(tp->t_state, TS_TBLOCK);
1346 if (ISSET(tp->t_iflag, IXOFF) && tp->t_cc[VSTOP] != _POSIX_VDISABLE &&
1347 putc(tp->t_cc[VSTOP], &tp->t_outq) != 0)
1348 CLR(tp->t_state, TS_TBLOCK); /* try again later */
1349 ttstart(tp);
1350}
1351
1352/*
1353 * Handle input low water. Send start character for the IXOFF case. Turn
1354 * off our input flow control bit and propagate the changes to the driver.
1355 * XXX the start character should be put in a special high priority queue.
1356 */
1357static void
1358ttyunblock(tp)
1359 struct tty *tp;
1360{
1361
1362 CLR(tp->t_state, TS_TBLOCK);
1363 if (ISSET(tp->t_iflag, IXOFF) && tp->t_cc[VSTART] != _POSIX_VDISABLE &&
1364 putc(tp->t_cc[VSTART], &tp->t_outq) != 0)
1365 SET(tp->t_state, TS_TBLOCK); /* try again later */
1366 ttstart(tp);
1367}
1368
1369#ifdef notyet
1370/* Not used by any current (i386) drivers. */
1371/*
1372 * Restart after an inter-char delay.
1373 */
1374void
1375ttrstrt(tp_arg)
1376 void *tp_arg;
1377{
1378 struct tty *tp;
1379 int s;
1380
1381 KASSERT(tp_arg != NULL, ("ttrstrt"));
1382
1383 tp = tp_arg;
1384 s = spltty();
1385
1386 CLR(tp->t_state, TS_TIMEOUT);
1387 ttstart(tp);
1388
1389 splx(s);
1390}
1391#endif
1392
1393int
1394ttstart(tp)
1395 struct tty *tp;
1396{
1397
1398 if (tp->t_oproc != NULL) /* XXX: Kludge for pty. */
1399 (*tp->t_oproc)(tp);
1400 return (0);
1401}
1402
1403/*
1404 * "close" a line discipline
1405 */
1406int
1407ttylclose(tp, flag)
1408 struct tty *tp;
1409 int flag;
1410{
1411
1412 if (flag & FNONBLOCK || ttywflush(tp))
1413 ttyflush(tp, FREAD | FWRITE);
1414 return (0);
1415}
1416
1417/*
1418 * Handle modem control transition on a tty.
1419 * Flag indicates new state of carrier.
1420 * Returns 0 if the line should be turned off, otherwise 1.
1421 */
1422int
1423ttymodem(tp, flag)
1424 register struct tty *tp;
1425 int flag;
1426{
1427
1428 if (ISSET(tp->t_state, TS_CARR_ON) && ISSET(tp->t_cflag, MDMBUF)) {
1429 /*
1430 * MDMBUF: do flow control according to carrier flag
1431 * XXX TS_CAR_OFLOW doesn't do anything yet. TS_TTSTOP
1432 * works if IXON and IXANY are clear.
1433 */
1434 if (flag) {
1435 CLR(tp->t_state, TS_CAR_OFLOW);
1436 CLR(tp->t_state, TS_TTSTOP);
1437 ttstart(tp);
1438 } else if (!ISSET(tp->t_state, TS_CAR_OFLOW)) {
1439 SET(tp->t_state, TS_CAR_OFLOW);
1440 SET(tp->t_state, TS_TTSTOP);
1441 (*tp->t_stop)(tp, 0);
1442 }
1443 } else if (flag == 0) {
1444 /*
1445 * Lost carrier.
1446 */
1447 CLR(tp->t_state, TS_CARR_ON);
1448 if (ISSET(tp->t_state, TS_ISOPEN) &&
1449 !ISSET(tp->t_cflag, CLOCAL)) {
1450 SET(tp->t_state, TS_ZOMBIE);
1451 CLR(tp->t_state, TS_CONNECTED);
1452 if (tp->t_session && tp->t_session->s_leader)
1453 psignal(tp->t_session->s_leader, SIGHUP);
1454 ttyflush(tp, FREAD | FWRITE);
1455 return (0);
1456 }
1457 } else {
1458 /*
1459 * Carrier now on.
1460 */
1461 SET(tp->t_state, TS_CARR_ON);
1462 if (!ISSET(tp->t_state, TS_ZOMBIE))
1463 SET(tp->t_state, TS_CONNECTED);
1464 wakeup(TSA_CARR_ON(tp));
1465 ttwakeup(tp);
1466 ttwwakeup(tp);
1467 }
1468 return (1);
1469}
1470
1471/*
1472 * Reinput pending characters after state switch
1473 * call at spltty().
1474 */
1475static void
1476ttypend(tp)
1477 register struct tty *tp;
1478{
1479 struct clist tq;
1480 register int c;
1481
1482 CLR(tp->t_lflag, PENDIN);
1483 SET(tp->t_state, TS_TYPEN);
1484 /*
1485 * XXX this assumes too much about clist internals. It may even
1486 * fail if the cblock slush pool is empty. We can't allocate more
1487 * cblocks here because we are called from an interrupt handler
1488 * and clist_alloc_cblocks() can wait.
1489 */
1490 tq = tp->t_rawq;
1491 bzero(&tp->t_rawq, sizeof tp->t_rawq);
1492 tp->t_rawq.c_cbmax = tq.c_cbmax;
1493 tp->t_rawq.c_cbreserved = tq.c_cbreserved;
1494 while ((c = getc(&tq)) >= 0)
1495 ttyinput(c, tp);
1496 CLR(tp->t_state, TS_TYPEN);
1497}
1498
1499/*
1500 * Process a read call on a tty device.
1501 */
1502int
1503ttread(tp, uio, flag)
1504 register struct tty *tp;
1505 struct uio *uio;
1506 int flag;
1507{
1508 register struct clist *qp;
1509 register int c;
1510 register tcflag_t lflag;
1511 register cc_t *cc = tp->t_cc;
1512 register struct proc *p = curproc;
1513 int s, first, error = 0;
1514 int has_stime = 0, last_cc = 0;
1515 long slp = 0; /* XXX this should be renamed `timo'. */
1516 struct timeval stime;
1517
1518loop:
1519 s = spltty();
1520 lflag = tp->t_lflag;
1521 /*
1522 * take pending input first
1523 */
1524 if (ISSET(lflag, PENDIN)) {
1525 ttypend(tp);
1526 splx(s); /* reduce latency */
1527 s = spltty();
1528 lflag = tp->t_lflag; /* XXX ttypend() clobbers it */
1529 }
1530
1531 /*
1532 * Hang process if it's in the background.
1533 */
1534 if (isbackground(p, tp)) {
1535 splx(s);
1536 if (SIGISMEMBER(p->p_sigignore, SIGTTIN) ||
1537 SIGISMEMBER(p->p_sigmask, SIGTTIN) ||
1538 (p->p_flag & P_PPWAIT) || p->p_pgrp->pg_jobc == 0)
1539 return (EIO);
1540 pgsignal(p->p_pgrp, SIGTTIN, 1);
1541 error = ttysleep(tp, &lbolt, TTIPRI | PCATCH, "ttybg2", 0);
1542 if (error)
1543 return (error);
1544 goto loop;
1545 }
1546
1547 if (ISSET(tp->t_state, TS_ZOMBIE)) {
1548 splx(s);
1549 return (0); /* EOF */
1550 }
1551
1552 /*
1553 * If canonical, use the canonical queue,
1554 * else use the raw queue.
1555 *
1556 * (should get rid of clists...)
1557 */
1558 qp = ISSET(lflag, ICANON) ? &tp->t_canq : &tp->t_rawq;
1559
1560 if (flag & IO_NDELAY) {
1561 if (qp->c_cc > 0)
1562 goto read;
1563 if (!ISSET(lflag, ICANON) && cc[VMIN] == 0) {
1564 splx(s);
1565 return (0);
1566 }
1567 splx(s);
1568 return (EWOULDBLOCK);
1569 }
1570 if (!ISSET(lflag, ICANON)) {
1571 int m = cc[VMIN];
1572 long t = cc[VTIME];
1573 struct timeval timecopy;
1574
1575 /*
1576 * Check each of the four combinations.
1577 * (m > 0 && t == 0) is the normal read case.
1578 * It should be fairly efficient, so we check that and its
1579 * companion case (m == 0 && t == 0) first.
1580 * For the other two cases, we compute the target sleep time
1581 * into slp.
1582 */
1583 if (t == 0) {
1584 if (qp->c_cc < m)
1585 goto sleep;
1586 if (qp->c_cc > 0)
1587 goto read;
1588
1589 /* m, t and qp->c_cc are all 0. 0 is enough input. */
1590 splx(s);
1591 return (0);
1592 }
1593 t *= 100000; /* time in us */
1594#define diff(t1, t2) (((t1).tv_sec - (t2).tv_sec) * 1000000 + \
1595 ((t1).tv_usec - (t2).tv_usec))
1596 if (m > 0) {
1597 if (qp->c_cc <= 0)
1598 goto sleep;
1599 if (qp->c_cc >= m)
1600 goto read;
1601 getmicrotime(&timecopy);
1602 if (!has_stime) {
1603 /* first character, start timer */
1604 has_stime = 1;
1605 stime = timecopy;
1606 slp = t;
1607 } else if (qp->c_cc > last_cc) {
1608 /* got a character, restart timer */
1609 stime = timecopy;
1610 slp = t;
1611 } else {
1612 /* nothing, check expiration */
1613 slp = t - diff(timecopy, stime);
1614 if (slp <= 0)
1615 goto read;
1616 }
1617 last_cc = qp->c_cc;
1618 } else { /* m == 0 */
1619 if (qp->c_cc > 0)
1620 goto read;
1621 getmicrotime(&timecopy);
1622 if (!has_stime) {
1623 has_stime = 1;
1624 stime = timecopy;
1625 slp = t;
1626 } else {
1627 slp = t - diff(timecopy, stime);
1628 if (slp <= 0) {
1629 /* Timed out, but 0 is enough input. */
1630 splx(s);
1631 return (0);
1632 }
1633 }
1634 }
1635#undef diff
1636 /*
1637 * Rounding down may make us wake up just short
1638 * of the target, so we round up.
1639 * The formula is ceiling(slp * hz/1000000).
1640 * 32-bit arithmetic is enough for hz < 169.
1641 * XXX see tvtohz() for how to avoid overflow if hz
1642 * is large (divide by `tick' and/or arrange to
1643 * use tvtohz() if hz is large).
1644 */
1645 slp = (long) (((u_long)slp * hz) + 999999) / 1000000;
1646 goto sleep;
1647 }
1648 if (qp->c_cc <= 0) {
1649sleep:
1650 /*
1651 * There is no input, or not enough input and we can block.
1652 */
1653 error = ttysleep(tp, TSA_HUP_OR_INPUT(tp), TTIPRI | PCATCH,
1654 ISSET(tp->t_state, TS_CONNECTED) ?
1655 "ttyin" : "ttyhup", (int)slp);
1656 splx(s);
1657 if (error == EWOULDBLOCK)
1658 error = 0;
1659 else if (error)
1660 return (error);
1661 /*
1662 * XXX what happens if another process eats some input
1663 * while we are asleep (not just here)? It would be
1664 * safest to detect changes and reset our state variables
1665 * (has_stime and last_cc).
1666 */
1667 slp = 0;
1668 goto loop;
1669 }
1670read:
1671 splx(s);
1672 /*
1673 * Input present, check for input mapping and processing.
1674 */
1675 first = 1;
1676 if (ISSET(lflag, ICANON | ISIG))
1677 goto slowcase;
1678 for (;;) {
1679 char ibuf[IBUFSIZ];
1680 int icc;
1681
1682 icc = imin(uio->uio_resid, IBUFSIZ);
1683 icc = q_to_b(qp, ibuf, icc);
1684 if (icc <= 0) {
1685 if (first)
1686 goto loop;
1687 break;
1688 }
1689 error = uiomove(ibuf, icc, uio);
1690 /*
1691 * XXX if there was an error then we should ungetc() the
1692 * unmoved chars and reduce icc here.
1693 */
1694 if (error)
1695 break;
1696 if (uio->uio_resid == 0)
1697 break;
1698 first = 0;
1699 }
1700 goto out;
1701slowcase:
1702 for (;;) {
1703 c = getc(qp);
1704 if (c < 0) {
1705 if (first)
1706 goto loop;
1707 break;
1708 }
1709 /*
1710 * delayed suspend (^Y)
1711 */
1712 if (CCEQ(cc[VDSUSP], c) &&
1713 ISSET(lflag, IEXTEN | ISIG) == (IEXTEN | ISIG)) {
1714 pgsignal(tp->t_pgrp, SIGTSTP, 1);
1715 if (first) {
1716 error = ttysleep(tp, &lbolt, TTIPRI | PCATCH,
1717 "ttybg3", 0);
1718 if (error)
1719 break;
1720 goto loop;
1721 }
1722 break;
1723 }
1724 /*
1725 * Interpret EOF only in canonical mode.
1726 */
1727 if (CCEQ(cc[VEOF], c) && ISSET(lflag, ICANON))
1728 break;
1729 /*
1730 * Give user character.
1731 */
1732 error = ureadc(c, uio);
1733 if (error)
1734 /* XXX should ungetc(c, qp). */
1735 break;
1736 if (uio->uio_resid == 0)
1737 break;
1738 /*
1739 * In canonical mode check for a "break character"
1740 * marking the end of a "line of input".
1741 */
1742 if (ISSET(lflag, ICANON) && TTBREAKC(c, lflag))
1743 break;
1744 first = 0;
1745 }
1746
1747out:
1748 /*
1749 * Look to unblock input now that (presumably)
1750 * the input queue has gone down.
1751 */
1752 s = spltty();
1753 if (ISSET(tp->t_state, TS_TBLOCK) &&
1754 tp->t_rawq.c_cc + tp->t_canq.c_cc <= tp->t_ilowat)
1755 ttyunblock(tp);
1756 splx(s);
1757
1758 return (error);
1759}
1760
1761/*
1762 * Check the output queue on tp for space for a kernel message (from uprintf
1763 * or tprintf). Allow some space over the normal hiwater mark so we don't
1764 * lose messages due to normal flow control, but don't let the tty run amok.
1765 * Sleeps here are not interruptible, but we return prematurely if new signals
1766 * arrive.
1767 */
1768int
1769ttycheckoutq(tp, wait)
1770 register struct tty *tp;
1771 int wait;
1772{
1773 int hiwat, s;
1774 sigset_t oldmask;
1775
1776 hiwat = tp->t_ohiwat;
1777 SIGEMPTYSET(oldmask);
1778 s = spltty();
1779 if (wait)
1780 oldmask = curproc->p_siglist;
1781 if (tp->t_outq.c_cc > hiwat + OBUFSIZ + 100)
1782 while (tp->t_outq.c_cc > hiwat) {
1783 ttstart(tp);
1784 if (tp->t_outq.c_cc <= hiwat)
1785 break;
1786 if (!(wait && SIGSETEQ(curproc->p_siglist, oldmask))) {
1787 splx(s);
1788 return (0);
1789 }
1790 SET(tp->t_state, TS_SO_OLOWAT);
1791 tsleep(TSA_OLOWAT(tp), PZERO - 1, "ttoutq", hz);
1792 }
1793 splx(s);
1794 return (1);
1795}
1796
1797/*
1798 * Process a write call on a tty device.
1799 */
1800int
1801ttwrite(tp, uio, flag)
1802 register struct tty *tp;
1803 register struct uio *uio;
1804 int flag;
1805{
1806 register char *cp = NULL;
1807 register int cc, ce;
1808 register struct proc *p;
1809 int i, hiwat, cnt, error, s;
1810 char obuf[OBUFSIZ];
1811
1812 hiwat = tp->t_ohiwat;
1813 cnt = uio->uio_resid;
1814 error = 0;
1815 cc = 0;
1816loop:
1817 s = spltty();
1818 if (ISSET(tp->t_state, TS_ZOMBIE)) {
1819 splx(s);
1820 if (uio->uio_resid == cnt)
1821 error = EIO;
1822 goto out;
1823 }
1824 if (!ISSET(tp->t_state, TS_CONNECTED)) {
1825 if (flag & IO_NDELAY) {
1826 splx(s);
1827 error = EWOULDBLOCK;
1828 goto out;
1829 }
1830 error = ttysleep(tp, TSA_CARR_ON(tp), TTIPRI | PCATCH,
1831 "ttydcd", 0);
1832 splx(s);
1833 if (error)
1834 goto out;
1835 goto loop;
1836 }
1837 splx(s);
1838 /*
1839 * Hang the process if it's in the background.
1840 */
1841 p = curproc;
1842 if (isbackground(p, tp) &&
1843 ISSET(tp->t_lflag, TOSTOP) && !(p->p_flag & P_PPWAIT) &&
1844 !SIGISMEMBER(p->p_sigignore, SIGTTOU) &&
1845 !SIGISMEMBER(p->p_sigmask, SIGTTOU)) {
1846 if (p->p_pgrp->pg_jobc == 0) {
1847 error = EIO;
1848 goto out;
1849 }
1850 pgsignal(p->p_pgrp, SIGTTOU, 1);
1851 error = ttysleep(tp, &lbolt, TTIPRI | PCATCH, "ttybg4", 0);
1852 if (error)
1853 goto out;
1854 goto loop;
1855 }
1856 /*
1857 * Process the user's data in at most OBUFSIZ chunks. Perform any
1858 * output translation. Keep track of high water mark, sleep on
1859 * overflow awaiting device aid in acquiring new space.
1860 */
1861 while (uio->uio_resid > 0 || cc > 0) {
1862 if (ISSET(tp->t_lflag, FLUSHO)) {
1863 uio->uio_resid = 0;
1864 return (0);
1865 }
1866 if (tp->t_outq.c_cc > hiwat)
1867 goto ovhiwat;
1868 /*
1869 * Grab a hunk of data from the user, unless we have some
1870 * leftover from last time.
1871 */
1872 if (cc == 0) {
1873 cc = imin(uio->uio_resid, OBUFSIZ);
1874 cp = obuf;
1875 error = uiomove(cp, cc, uio);
1876 if (error) {
1877 cc = 0;
1878 break;
1879 }
1880 }
1881 /*
1882 * If nothing fancy need be done, grab those characters we
1883 * can handle without any of ttyoutput's processing and
1884 * just transfer them to the output q. For those chars
1885 * which require special processing (as indicated by the
1886 * bits in char_type), call ttyoutput. After processing
1887 * a hunk of data, look for FLUSHO so ^O's will take effect
1888 * immediately.
1889 */
1890 while (cc > 0) {
1891 if (!ISSET(tp->t_oflag, OPOST))
1892 ce = cc;
1893 else {
1894 ce = cc - scanc((u_int)cc, (u_char *)cp,
1895 char_type, CCLASSMASK);
1896 /*
1897 * If ce is zero, then we're processing
1898 * a special character through ttyoutput.
1899 */
1900 if (ce == 0) {
1901 tp->t_rocount = 0;
1902 if (ttyoutput(*cp, tp) >= 0) {
1903 /* No Clists, wait a bit. */
1904 ttstart(tp);
1905 if (flag & IO_NDELAY) {
1906 error = EWOULDBLOCK;
1907 goto out;
1908 }
1909 error = ttysleep(tp, &lbolt,
1910 TTOPRI|PCATCH,
1911 "ttybf1", 0);
1912 if (error)
1913 goto out;
1914 goto loop;
1915 }
1916 cp++;
1917 cc--;
1918 if (ISSET(tp->t_lflag, FLUSHO) ||
1919 tp->t_outq.c_cc > hiwat)
1920 goto ovhiwat;
1921 continue;
1922 }
1923 }
1924 /*
1925 * A bunch of normal characters have been found.
1926 * Transfer them en masse to the output queue and
1927 * continue processing at the top of the loop.
1928 * If there are any further characters in this
1929 * <= OBUFSIZ chunk, the first should be a character
1930 * requiring special handling by ttyoutput.
1931 */
1932 tp->t_rocount = 0;
1933 i = b_to_q(cp, ce, &tp->t_outq);
1934 ce -= i;
1935 tp->t_column += ce;
1936 cp += ce, cc -= ce, tk_nout += ce;
1937 tp->t_outcc += ce;
1938 if (i > 0) {
1939 /* No Clists, wait a bit. */
1940 ttstart(tp);
1941 if (flag & IO_NDELAY) {
1942 error = EWOULDBLOCK;
1943 goto out;
1944 }
1945 error = ttysleep(tp, &lbolt, TTOPRI | PCATCH,
1946 "ttybf2", 0);
1947 if (error)
1948 goto out;
1949 goto loop;
1950 }
1951 if (ISSET(tp->t_lflag, FLUSHO) ||
1952 tp->t_outq.c_cc > hiwat)
1953 break;
1954 }
1955 ttstart(tp);
1956 }
1957out:
1958 /*
1959 * If cc is nonzero, we leave the uio structure inconsistent, as the
1960 * offset and iov pointers have moved forward, but it doesn't matter
1961 * (the call will either return short or restart with a new uio).
1962 */
1963 uio->uio_resid += cc;
1964 return (error);
1965
1966ovhiwat:
1967 ttstart(tp);
1968 s = spltty();
1969 /*
1970 * This can only occur if FLUSHO is set in t_lflag,
1971 * or if ttstart/oproc is synchronous (or very fast).
1972 */
1973 if (tp->t_outq.c_cc <= hiwat) {
1974 splx(s);
1975 goto loop;
1976 }
1977 if (flag & IO_NDELAY) {
1978 splx(s);
1979 uio->uio_resid += cc;
1980 return (uio->uio_resid == cnt ? EWOULDBLOCK : 0);
1981 }
1982 SET(tp->t_state, TS_SO_OLOWAT);
1983 error = ttysleep(tp, TSA_OLOWAT(tp), TTOPRI | PCATCH, "ttywri",
1984 tp->t_timeout);
1985 splx(s);
1986 if (error == EWOULDBLOCK)
1987 error = EIO;
1988 if (error)
1989 goto out;
1990 goto loop;
1991}
1992
1993/*
1994 * Rubout one character from the rawq of tp
1995 * as cleanly as possible.
1996 */
1997static void
1998ttyrub(c, tp)
1999 register int c;
2000 register struct tty *tp;
2001{
2002 register char *cp;
2003 register int savecol;
2004 int tabc, s;
2005
2006 if (!ISSET(tp->t_lflag, ECHO) || ISSET(tp->t_lflag, EXTPROC))
2007 return;
2008 CLR(tp->t_lflag, FLUSHO);
2009 if (ISSET(tp->t_lflag, ECHOE)) {
2010 if (tp->t_rocount == 0) {
2011 /*
2012 * Screwed by ttwrite; retype
2013 */
2014 ttyretype(tp);
2015 return;
2016 }
2017 if (c == ('\t' | TTY_QUOTE) || c == ('\n' | TTY_QUOTE))
2018 ttyrubo(tp, 2);
2019 else {
2020 CLR(c, ~TTY_CHARMASK);
2021 switch (CCLASS(c)) {
2022 case ORDINARY:
2023 ttyrubo(tp, 1);
2024 break;
2025 case BACKSPACE:
2026 case CONTROL:
2027 case NEWLINE:
2028 case RETURN:
2029 case VTAB:
2030 if (ISSET(tp->t_lflag, ECHOCTL))
2031 ttyrubo(tp, 2);
2032 break;
2033 case TAB:
2034 if (tp->t_rocount < tp->t_rawq.c_cc) {
2035 ttyretype(tp);
2036 return;
2037 }
2038 s = spltty();
2039 savecol = tp->t_column;
2040 SET(tp->t_state, TS_CNTTB);
2041 SET(tp->t_lflag, FLUSHO);
2042 tp->t_column = tp->t_rocol;
2043 cp = tp->t_rawq.c_cf;
2044 if (cp)
2045 tabc = *cp; /* XXX FIX NEXTC */
2046 for (; cp; cp = nextc(&tp->t_rawq, cp, &tabc))
2047 ttyecho(tabc, tp);
2048 CLR(tp->t_lflag, FLUSHO);
2049 CLR(tp->t_state, TS_CNTTB);
2050 splx(s);
2051
2052 /* savecol will now be length of the tab. */
2053 savecol -= tp->t_column;
2054 tp->t_column += savecol;
2055 if (savecol > 8)
2056 savecol = 8; /* overflow screw */
2057 while (--savecol >= 0)
2058 (void)ttyoutput('\b', tp);
2059 break;
2060 default: /* XXX */
2061#define PANICSTR "ttyrub: would panic c = %d, val = %d\n"
2062 (void)printf(PANICSTR, c, CCLASS(c));
2063#ifdef notdef
2064 panic(PANICSTR, c, CCLASS(c));
2065#endif
2066 }
2067 }
2068 } else if (ISSET(tp->t_lflag, ECHOPRT)) {
2069 if (!ISSET(tp->t_state, TS_ERASE)) {
2070 SET(tp->t_state, TS_ERASE);
2071 (void)ttyoutput('\\', tp);
2072 }
2073 ttyecho(c, tp);
2074 } else {
2075 ttyecho(tp->t_cc[VERASE], tp);
2076 /*
2077 * This code may be executed not only when an ERASE key
2078 * is pressed, but also when ^U (KILL) or ^W (WERASE) are.
2079 * So, I didn't think it was worthwhile to pass the extra
2080 * information (which would need an extra parameter,
2081 * changing every call) needed to distinguish the ERASE2
2082 * case from the ERASE.
2083 */
2084 }
2085 --tp->t_rocount;
2086}
2087
2088/*
2089 * Back over cnt characters, erasing them.
2090 */
2091static void
2092ttyrubo(tp, cnt)
2093 register struct tty *tp;
2094 int cnt;
2095{
2096
2097 while (cnt-- > 0) {
2098 (void)ttyoutput('\b', tp);
2099 (void)ttyoutput(' ', tp);
2100 (void)ttyoutput('\b', tp);
2101 }
2102}
2103
2104/*
2105 * ttyretype --
2106 * Reprint the rawq line. Note, it is assumed that c_cc has already
2107 * been checked.
2108 */
2109static void
2110ttyretype(tp)
2111 register struct tty *tp;
2112{
2113 register char *cp;
2114 int s, c;
2115
2116 /* Echo the reprint character. */
2117 if (tp->t_cc[VREPRINT] != _POSIX_VDISABLE)
2118 ttyecho(tp->t_cc[VREPRINT], tp);
2119
2120 (void)ttyoutput('\n', tp);
2121
2122 /*
2123 * XXX
2124 * FIX: NEXTC IS BROKEN - DOESN'T CHECK QUOTE
2125 * BIT OF FIRST CHAR.
2126 */
2127 s = spltty();
2128 for (cp = tp->t_canq.c_cf, c = (cp != NULL ? *cp : 0);
2129 cp != NULL; cp = nextc(&tp->t_canq, cp, &c))
2130 ttyecho(c, tp);
2131 for (cp = tp->t_rawq.c_cf, c = (cp != NULL ? *cp : 0);
2132 cp != NULL; cp = nextc(&tp->t_rawq, cp, &c))
2133 ttyecho(c, tp);
2134 CLR(tp->t_state, TS_ERASE);
2135 splx(s);
2136
2137 tp->t_rocount = tp->t_rawq.c_cc;
2138 tp->t_rocol = 0;
2139}
2140
2141/*
2142 * Echo a typed character to the terminal.
2143 */
2144static void
2145ttyecho(c, tp)
2146 register int c;
2147 register struct tty *tp;
2148{
2149
2150 if (!ISSET(tp->t_state, TS_CNTTB))
2151 CLR(tp->t_lflag, FLUSHO);
2152 if ((!ISSET(tp->t_lflag, ECHO) &&
2153 (c != '\n' || !ISSET(tp->t_lflag, ECHONL))) ||
2154 ISSET(tp->t_lflag, EXTPROC))
2155 return;
2156 if (ISSET(tp->t_lflag, ECHOCTL) &&
2157 ((ISSET(c, TTY_CHARMASK) <= 037 && c != '\t' && c != '\n') ||
2158 ISSET(c, TTY_CHARMASK) == 0177)) {
2159 (void)ttyoutput('^', tp);
2160 CLR(c, ~TTY_CHARMASK);
2161 if (c == 0177)
2162 c = '?';
2163 else
2164 c += 'A' - 1;
2165 }
2166 (void)ttyoutput(c, tp);
2167}
2168
2169/*
2170 * Wake up any readers on a tty.
2171 */
2172void
2173ttwakeup(tp)
2174 register struct tty *tp;
2175{
2176
2177 if (tp->t_rsel.si_pid != 0)
2178 selwakeup(&tp->t_rsel);
2179 if (ISSET(tp->t_state, TS_ASYNC) && tp->t_sigio != NULL)
2180 pgsigio(tp->t_sigio, SIGIO, (tp->t_session != NULL));
2181 wakeup(TSA_HUP_OR_INPUT(tp));
2182 KNOTE(&tp->t_rsel.si_note, 0);
2183}
2184
2185/*
2186 * Wake up any writers on a tty.
2187 */
2188void
2189ttwwakeup(tp)
2190 register struct tty *tp;
2191{
2192
2193 if (tp->t_wsel.si_pid != 0 && tp->t_outq.c_cc <= tp->t_olowat)
2194 selwakeup(&tp->t_wsel);
2195 if (ISSET(tp->t_state, TS_ASYNC) && tp->t_sigio != NULL)
2196 pgsigio(tp->t_sigio, SIGIO, (tp->t_session != NULL));
2197 if (ISSET(tp->t_state, TS_BUSY | TS_SO_OCOMPLETE) ==
2198 TS_SO_OCOMPLETE && tp->t_outq.c_cc == 0) {
2199 CLR(tp->t_state, TS_SO_OCOMPLETE);
2200 wakeup(TSA_OCOMPLETE(tp));
2201 }
2202 if (ISSET(tp->t_state, TS_SO_OLOWAT) &&
2203 tp->t_outq.c_cc <= tp->t_olowat) {
2204 CLR(tp->t_state, TS_SO_OLOWAT);
2205 wakeup(TSA_OLOWAT(tp));
2206 }
2207 KNOTE(&tp->t_wsel.si_note, 0);
2208}
2209
2210/*
2211 * Look up a code for a specified speed in a conversion table;
2212 * used by drivers to map software speed values to hardware parameters.
2213 */
2214int
2215ttspeedtab(speed, table)
2216 int speed;
2217 register struct speedtab *table;
2218{
2219
2220 for ( ; table->sp_speed != -1; table++)
2221 if (table->sp_speed == speed)
2222 return (table->sp_code);
2223 return (-1);
2224}
2225
2226/*
2227 * Set input and output watermarks and buffer sizes. For input, the
2228 * high watermark is about one second's worth of input above empty, the
2229 * low watermark is slightly below high water, and the buffer size is a
2230 * driver-dependent amount above high water. For output, the watermarks
2231 * are near the ends of the buffer, with about 1 second's worth of input
2232 * between them. All this only applies to the standard line discipline.
2233 */
2234void
2235ttsetwater(tp)
2236 struct tty *tp;
2237{
2238 register int cps, ttmaxhiwat, x;
2239
2240 /* Input. */
2241 clist_alloc_cblocks(&tp->t_canq, TTYHOG, 512);
2242 switch (tp->t_ispeedwat) {
2243 case (speed_t)-1:
2244 cps = tp->t_ispeed / 10;
2245 break;
2246 case 0:
2247 /*
2248 * This case is for old drivers that don't know about
2249 * t_ispeedwat. Arrange for them to get the old buffer
2250 * sizes and watermarks.
2251 */
2252 cps = TTYHOG - 2 * 256;
2253 tp->t_ififosize = 2 * 256;
2254 break;
2255 default:
2256 cps = tp->t_ispeedwat / 10;
2257 break;
2258 }
2259 tp->t_ihiwat = cps;
2260 tp->t_ilowat = 7 * cps / 8;
2261 x = cps + tp->t_ififosize;
2262 clist_alloc_cblocks(&tp->t_rawq, x, x);
2263
2264 /* Output. */
2265 switch (tp->t_ospeedwat) {
2266 case (speed_t)-1:
2267 cps = tp->t_ospeed / 10;
2268 ttmaxhiwat = 2 * TTMAXHIWAT;
2269 break;
2270 case 0:
2271 cps = tp->t_ospeed / 10;
2272 ttmaxhiwat = TTMAXHIWAT;
2273 break;
2274 default:
2275 cps = tp->t_ospeedwat / 10;
2276 ttmaxhiwat = 8 * TTMAXHIWAT;
2277 break;
2278 }
2279#define CLAMP(x, h, l) ((x) > h ? h : ((x) < l) ? l : (x))
2280 tp->t_olowat = x = CLAMP(cps / 2, TTMAXLOWAT, TTMINLOWAT);
2281 x += cps;
2282 x = CLAMP(x, ttmaxhiwat, TTMINHIWAT); /* XXX clamps are too magic */
2283 tp->t_ohiwat = roundup(x, CBSIZE); /* XXX for compat */
2284 x = imax(tp->t_ohiwat, TTMAXHIWAT); /* XXX for compat/safety */
2285 x += OBUFSIZ + 100;
2286 clist_alloc_cblocks(&tp->t_outq, x, x);
2287#undef CLAMP
2288}
2289
2290/*
2291 * Report on state of foreground process group.
2292 */
2293void
2294ttyinfo(tp)
2295 register struct tty *tp;
2296{
2297 register struct proc *p, *pick;
2298 struct timeval utime, stime;
2299 int tmp;
2300
2301 if (ttycheckoutq(tp,0) == 0)
2302 return;
2303
2304 /* Print load average. */
2305 tmp = (averunnable.ldavg[0] * 100 + FSCALE / 2) >> FSHIFT;
2306 ttyprintf(tp, "load: %d.%02d ", tmp / 100, tmp % 100);
2307
2308 if (tp->t_session == NULL)
2309 ttyprintf(tp, "not a controlling terminal\n");
2310 else if (tp->t_pgrp == NULL)
2311 ttyprintf(tp, "no foreground process group\n");
2312 else if ((p = LIST_FIRST(&tp->t_pgrp->pg_members)) == 0)
2313 ttyprintf(tp, "empty foreground process group\n");
2314 else {
2315 /* Pick interesting process. */
2316 for (pick = NULL; p != 0; p = LIST_NEXT(p, p_pglist))
2317 if (proc_compare(pick, p))
2318 pick = p;
2319
2320 ttyprintf(tp, " cmd: %s %d [%s] ", pick->p_comm, pick->p_pid,
2321 pick->p_stat == SRUN ? "running" :
2322 pick->p_wmesg ? pick->p_wmesg : "iowait");
2323
2324 if (pick->p_flag & P_INMEM) {
2325 calcru(pick, &utime, &stime, NULL);
2326
2327 /* Print user time. */
2328 ttyprintf(tp, "%ld.%02ldu ",
2329 utime.tv_sec, utime.tv_usec / 10000);
2330
2331 /* Print system time. */
2332 ttyprintf(tp, "%ld.%02lds ",
2333 stime.tv_sec, stime.tv_usec / 10000);
2334 } else
2335 ttyprintf(tp, "?.??u ?.??s ");
2336
2337 /* Print percentage cpu, resident set size. */
2338 tmp = (pick->p_pctcpu * 10000 + FSCALE / 2) >> FSHIFT;
2339 ttyprintf(tp, "%d%% %ldk\n",
2340 tmp / 100,
2341 pick->p_stat == SIDL || pick->p_stat == SZOMB ? 0 :
2342 (long)pgtok(vmspace_resident_count(pick->p_vmspace)));
2343 }
2344 tp->t_rocount = 0; /* so pending input will be retyped if BS */
2345}
2346
2347/*
2348 * Returns 1 if p2 is "better" than p1
2349 *
2350 * The algorithm for picking the "interesting" process is thus:
2351 *
2352 * 1) Only foreground processes are eligible - implied.
2353 * 2) Runnable processes are favored over anything else. The runner
2354 * with the highest cpu utilization is picked (p_estcpu). Ties are
2355 * broken by picking the highest pid.
2356 * 3) The sleeper with the shortest sleep time is next. With ties,
2357 * we pick out just "short-term" sleepers (P_SINTR == 0).
2358 * 4) Further ties are broken by picking the highest pid.
2359 */
2360#define ISRUN(p) (((p)->p_stat == SRUN) || ((p)->p_stat == SIDL))
2361#define TESTAB(a, b) ((a)<<1 | (b))
2362#define ONLYA 2
2363#define ONLYB 1
2364#define BOTH 3
2365
2366static int
2367proc_compare(p1, p2)
2368 register struct proc *p1, *p2;
2369{
2370
2371 if (p1 == NULL)
2372 return (1);
2373 /*
2374 * see if at least one of them is runnable
2375 */
2376 switch (TESTAB(ISRUN(p1), ISRUN(p2))) {
2377 case ONLYA:
2378 return (0);
2379 case ONLYB:
2380 return (1);
2381 case BOTH:
2382 /*
2383 * tie - favor one with highest recent cpu utilization
2384 */
2385 if (p2->p_estcpu > p1->p_estcpu)
2386 return (1);
2387 if (p1->p_estcpu > p2->p_estcpu)
2388 return (0);
2389 return (p2->p_pid > p1->p_pid); /* tie - return highest pid */
2390 }
2391 /*
2392 * weed out zombies
2393 */
2394 switch (TESTAB(p1->p_stat == SZOMB, p2->p_stat == SZOMB)) {
2395 case ONLYA:
2396 return (1);
2397 case ONLYB:
2398 return (0);
2399 case BOTH:
2400 return (p2->p_pid > p1->p_pid); /* tie - return highest pid */
2401 }
2402 /*
2403 * pick the one with the smallest sleep time
2404 */
2405 if (p2->p_slptime > p1->p_slptime)
2406 return (0);
2407 if (p1->p_slptime > p2->p_slptime)
2408 return (1);
2409 /*
2410 * favor one sleeping in a non-interruptible sleep
2411 */
2412 if (p1->p_flag & P_SINTR && (p2->p_flag & P_SINTR) == 0)
2413 return (1);
2414 if (p2->p_flag & P_SINTR && (p1->p_flag & P_SINTR) == 0)
2415 return (0);
2416 return (p2->p_pid > p1->p_pid); /* tie - return highest pid */
2417}
2418
2419/*
2420 * Output char to tty; console putchar style.
2421 */
2422int
2423tputchar(c, tp)
2424 int c;
2425 struct tty *tp;
2426{
2427 register int s;
2428
2429 s = spltty();
2430 if (!ISSET(tp->t_state, TS_CONNECTED)) {
2431 splx(s);
2432 return (-1);
2433 }
2434 if (c == '\n')
2435 (void)ttyoutput('\r', tp);
2436 (void)ttyoutput(c, tp);
2437 ttstart(tp);
2438 splx(s);
2439 return (0);
2440}
2441
2442/*
2443 * Sleep on chan, returning ERESTART if tty changed while we napped and
2444 * returning any errors (e.g. EINTR/EWOULDBLOCK) reported by tsleep. If
2445 * the tty is revoked, restarting a pending call will redo validation done
2446 * at the start of the call.
2447 */
2448int
2449ttysleep(tp, chan, pri, wmesg, timo)
2450 struct tty *tp;
2451 void *chan;
2452 int pri, timo;
2453 char *wmesg;
2454{
2455 int error;
2456 int gen;
2457
2458 gen = tp->t_gen;
2459 error = tsleep(chan, pri, wmesg, timo);
2460 if (error)
2461 return (error);
2462 return (tp->t_gen == gen ? 0 : ERESTART);
2463}
2464
2465/*
2466 * Allocate a tty struct. Clists in the struct will be allocated by
2467 * ttyopen().
2468 */
2469struct tty *
2470ttymalloc(tp)
2471 struct tty *tp;
2472{
2473
2474 if (tp)
2475 return(tp);
2476 tp = malloc(sizeof *tp, M_TTYS, M_WAITOK);
2477 bzero(tp, sizeof *tp);
2478 ttyregister(tp);
2479 return (tp);
2480}
2481
2482#if 0 /* XXX not yet usable: session leader holds a ref (see kern_exit.c). */
2483/*
2484 * Free a tty struct. Clists in the struct should have been freed by
2485 * ttyclose().
2486 */
2487void
2488ttyfree(tp)
2489 struct tty *tp;
2490{
2491 free(tp, M_TTYS);
2492}
2493#endif /* 0 */
2494
2495void
2496ttyregister(tp)
2497 struct tty *tp;
2498{
2499 SLIST_INSERT_HEAD(&tty_list, tp, t_list);
2500}
2501
2502static int
2503sysctl_kern_ttys(SYSCTL_HANDLER_ARGS)
2504{
2505 int error;
2506 struct tty *tp, t;
2507 SLIST_FOREACH(tp, &tty_list, t_list) {
2508 t = *tp;
2509 if (t.t_dev)
2510 t.t_dev = (dev_t)dev2udev(t.t_dev);
2511 error = SYSCTL_OUT(req, (caddr_t)&t, sizeof(t));
2512 if (error)
2513 return (error);
2514 }
2515 return (0);
2516}
2517
2518SYSCTL_PROC(_kern, OID_AUTO, ttys, CTLTYPE_OPAQUE|CTLFLAG_RD,
2519 0, 0, sysctl_kern_ttys, "S,tty", "All struct ttys");
2520
2521void
2522nottystop(tp, rw)
2523 struct tty *tp;
2524 int rw;
2525{
2526
2527 return;
2528}
2529
2530int
2531ttyread(dev, uio, flag)
2532 dev_t dev;
2533 struct uio *uio;
2534 int flag;
2535{
2536 struct tty *tp;
2537
2538 tp = dev->si_tty;
2539 if (tp == NULL)
2540 return (ENODEV);
2541 return ((*linesw[tp->t_line].l_read)(tp, uio, flag));
2542}
2543
2544int
2545ttywrite(dev, uio, flag)
2546 dev_t dev;
2547 struct uio *uio;
2548 int flag;
2549{
2550 struct tty *tp;
2551
2552 tp = dev->si_tty;
2553 if (tp == NULL)
2554 return (ENODEV);
2555 return ((*linesw[tp->t_line].l_write)(tp, uio, flag));
2556}