Change the kernel dev_t, representing a pointer to a specinfo structure,
[dragonfly.git] / sys / kern / tty.c
CommitLineData
984263bc
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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 $
b13267a5 40 * $DragonFly: src/sys/kern/tty.c,v 1.30 2006/09/10 01:26:39 dillon Exp $
984263bc
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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>
a38e57d5 83#include <sys/clist.h>
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84#undef TTYDEFCHARS
85#include <sys/fcntl.h>
86#include <sys/conf.h>
87#include <sys/dkstat.h>
88#include <sys/poll.h>
89#include <sys/kernel.h>
90#include <sys/vnode.h>
91#include <sys/signalvar.h>
92#include <sys/resourcevar.h>
93#include <sys/malloc.h>
94#include <sys/filedesc.h>
95#include <sys/sysctl.h>
8dda877a 96#include <sys/thread2.h>
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97
98#include <vm/vm.h>
99#include <sys/lock.h>
100#include <vm/pmap.h>
101#include <vm/vm_map.h>
102
103MALLOC_DEFINE(M_TTYS, "ttys", "tty data structures");
104
402ed7e1
RG
105static int proc_compare (struct proc *p1, struct proc *p2);
106static int ttnread (struct tty *tp);
107static void ttyecho (int c, struct tty *tp);
108static int ttyoutput (int c, struct tty *tp);
109static void ttypend (struct tty *tp);
110static void ttyretype (struct tty *tp);
111static void ttyrub (int c, struct tty *tp);
112static void ttyrubo (struct tty *tp, int cnt);
113static void ttyunblock (struct tty *tp);
114static int ttywflush (struct tty *tp);
115static int filt_ttyread (struct knote *kn, long hint);
116static void filt_ttyrdetach (struct knote *kn);
117static int filt_ttywrite (struct knote *kn, long hint);
118static void filt_ttywdetach (struct knote *kn);
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119
120/*
121 * Table with character classes and parity. The 8th bit indicates parity,
122 * the 7th bit indicates the character is an alphameric or underscore (for
123 * ALTWERASE), and the low 6 bits indicate delay type. If the low 6 bits
124 * are 0 then the character needs no special processing on output; classes
125 * other than 0 might be translated or (not currently) require delays.
126 */
127#define E 0x00 /* Even parity. */
128#define O 0x80 /* Odd parity. */
129#define PARITY(c) (char_type[c] & O)
130
131#define ALPHA 0x40 /* Alpha or underscore. */
132#define ISALPHA(c) (char_type[(c) & TTY_CHARMASK] & ALPHA)
133
134#define CCLASSMASK 0x3f
135#define CCLASS(c) (char_type[c] & CCLASSMASK)
136
137#define BS BACKSPACE
138#define CC CONTROL
139#define CR RETURN
140#define NA ORDINARY | ALPHA
141#define NL NEWLINE
142#define NO ORDINARY
143#define TB TAB
144#define VT VTAB
145
146static u_char const char_type[] = {
147 E|CC, O|CC, O|CC, E|CC, O|CC, E|CC, E|CC, O|CC, /* nul - bel */
148 O|BS, E|TB, E|NL, O|CC, E|VT, O|CR, O|CC, E|CC, /* bs - si */
149 O|CC, E|CC, E|CC, O|CC, E|CC, O|CC, O|CC, E|CC, /* dle - etb */
150 E|CC, O|CC, O|CC, E|CC, O|CC, E|CC, E|CC, O|CC, /* can - us */
151 O|NO, E|NO, E|NO, O|NO, E|NO, O|NO, O|NO, E|NO, /* sp - ' */
152 E|NO, O|NO, O|NO, E|NO, O|NO, E|NO, E|NO, O|NO, /* ( - / */
153 E|NA, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* 0 - 7 */
154 O|NA, E|NA, E|NO, O|NO, E|NO, O|NO, O|NO, E|NO, /* 8 - ? */
155 O|NO, E|NA, E|NA, O|NA, E|NA, O|NA, O|NA, E|NA, /* @ - G */
156 E|NA, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* H - O */
157 E|NA, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* P - W */
158 O|NA, E|NA, E|NA, O|NO, E|NO, O|NO, O|NO, O|NA, /* X - _ */
159 E|NO, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* ` - g */
160 O|NA, E|NA, E|NA, O|NA, E|NA, O|NA, O|NA, E|NA, /* h - o */
161 O|NA, E|NA, E|NA, O|NA, E|NA, O|NA, O|NA, E|NA, /* p - w */
162 E|NA, O|NA, O|NA, E|NO, O|NO, E|NO, E|NO, O|CC, /* x - del */
163 /*
164 * Meta chars; should be settable per character set;
165 * for now, treat them all as normal characters.
166 */
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 NA, NA, NA, NA, NA, NA, NA, NA,
182 NA, NA, NA, NA, NA, NA, NA, NA,
183};
184#undef BS
185#undef CC
186#undef CR
187#undef NA
188#undef NL
189#undef NO
190#undef TB
191#undef VT
192
193/* Macros to clear/set/test flags. */
194#define SET(t, f) (t) |= (f)
195#define CLR(t, f) (t) &= ~(f)
196#define ISSET(t, f) ((t) & (f))
197
198#undef MAX_INPUT /* XXX wrong in <sys/syslimits.h> */
199#define MAX_INPUT TTYHOG /* XXX limit is usually larger for !ICANON */
200
f5d21610
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201uint64_t tk_nin;
202SYSCTL_OPAQUE(_kern, OID_AUTO, tk_nin, CTLFLAG_RD, &tk_nin, sizeof(tk_nin),
203 "LU", "TTY input statistic");
204uint64_t tk_nout;
205SYSCTL_OPAQUE(_kern, OID_AUTO, tk_nout, CTLFLAG_RD, &tk_nout, sizeof(tk_nout),
206 "LU", "TTY output statistic");
207uint64_t tk_rawcc;
208
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209/*
210 * list of struct tty where pstat(8) can pick it up with sysctl
211 */
212static SLIST_HEAD(, tty) tty_list;
213
214/*
215 * Initial open of tty, or (re)entry to standard tty line discipline.
216 */
217int
218ttyopen(device, tp)
b13267a5 219 cdev_t device;
1fd87d54 220 struct tty *tp;
984263bc 221{
e43a034f 222 crit_enter();
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MD
223 tp->t_dev = device;
224 if (!ISSET(tp->t_state, TS_ISOPEN)) {
225 SET(tp->t_state, TS_ISOPEN);
226 if (ISSET(tp->t_cflag, CLOCAL))
227 SET(tp->t_state, TS_CONNECTED);
228 bzero(&tp->t_winsize, sizeof(tp->t_winsize));
229 }
230 ttsetwater(tp);
e43a034f 231 crit_exit();
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232 return (0);
233}
234
235/*
236 * Handle close() on a tty line: flush and set to initial state,
237 * bumping generation number so that pending read/write calls
238 * can detect recycling of the tty.
8b90699b 239 *
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240 * XXX our caller should have done `spltty(); l_close(); ttyclose();'
241 * and l_close() should have flushed, but we repeat the spltty() and
242 * the flush in case there are buggy callers.
243 */
244int
245ttyclose(tp)
1fd87d54 246 struct tty *tp;
984263bc 247{
984263bc 248 funsetown(tp->t_sigio);
e43a034f 249 crit_enter();
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MD
250 if (constty == tp)
251 constty = NULL;
252
253 ttyflush(tp, FREAD | FWRITE);
254 clist_free_cblocks(&tp->t_canq);
255 clist_free_cblocks(&tp->t_outq);
256 clist_free_cblocks(&tp->t_rawq);
257
258 tp->t_gen++;
259 tp->t_line = TTYDISC;
8b90699b 260 ttyclearsession(tp);
984263bc 261 tp->t_state = 0;
e43a034f 262 crit_exit();
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263 return (0);
264}
265
8b90699b
MD
266/*
267 * Disassociate the tty from its session. Traditionally this has only been
268 * a half-close, meaning that the session was still allowed to point at the
269 * tty (resulting in the tty in the ps command showing something like 'p0-'),
270 * even though the tty is no longer pointing at the session.
271 *
272 * The half close seems to be useful only for 'ps' output but there is as
273 * yet no reason to remove the feature. The full-close code is currently
274 * #if 0'd out. See also sess_rele() in kern/kern_proc.c.
275 */
276void
277ttyclearsession(struct tty *tp)
278{
279 struct session *sp;
280
281 tp->t_pgrp = NULL;
282 if ((sp = tp->t_session) != NULL) {
283 tp->t_session = NULL;
284#ifdef TTY_DO_FULL_CLOSE
285 /* FULL CLOSE (not yet) */
286 if (sp->s_ttyp == tp) {
287 sp->s_ttyp = NULL;
288 } else {
289 printf("ttyclearsession: warning: sp->s_ttyp != tp "
290 "%p/%p\n", sp->s_ttyp, tp);
291 }
292#endif
293 }
294}
295
5fd012e0
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296/*
297 * Terminate the tty vnode association for a session. This is the
84cca6ec
MD
298 * 'other half' of the close. Because multiple opens of /dev/tty
299 * only generate a single open to the actual tty, the file modes
300 * are locked to FREAD|FWRITE.
5fd012e0
MD
301 */
302void
303ttyclosesession(struct session *sp, int dorele)
304{
305 struct vnode *vp;
5fd012e0
MD
306
307 if ((vp = sp->s_ttyvp) == NULL)
308 return;
309 sp->s_ttyvp = NULL;
310 if (vp->v_flag & VCTTYISOPEN) {
ca466bae 311 if (vn_lock(vp, LK_EXCLUSIVE|LK_RETRY) == 0) {
5fd012e0 312 vclrflags(vp, VCTTYISOPEN);
87de5057 313 VOP_CLOSE(vp, FREAD|FWRITE);
a11aaa81 314 vn_unlock(vp);
5fd012e0
MD
315 }
316 }
317 if (dorele)
318 vrele(vp);
319}
320
321
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322#define FLUSHQ(q) { \
323 if ((q)->c_cc) \
324 ndflush(q, (q)->c_cc); \
325}
326
327/* Is 'c' a line delimiter ("break" character)? */
328#define TTBREAKC(c, lflag) \
329 ((c) == '\n' || (((c) == cc[VEOF] || \
330 (c) == cc[VEOL] || ((c) == cc[VEOL2] && lflag & IEXTEN)) && \
331 (c) != _POSIX_VDISABLE))
332
333/*
334 * Process input of a single character received on a tty.
335 */
336int
337ttyinput(c, tp)
1fd87d54
RG
338 int c;
339 struct tty *tp;
984263bc 340{
1fd87d54
RG
341 tcflag_t iflag, lflag;
342 cc_t *cc;
984263bc
MD
343 int i, err;
344
345 /*
346 * If input is pending take it first.
347 */
348 lflag = tp->t_lflag;
349 if (ISSET(lflag, PENDIN))
350 ttypend(tp);
351 /*
352 * Gather stats.
353 */
f5d21610 354 if (ISSET(lflag, ICANON))
984263bc 355 ++tp->t_cancc;
f5d21610 356 else
984263bc 357 ++tp->t_rawcc;
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MD
358 ++tk_nin;
359
360 /*
361 * Block further input iff:
362 * current input > threshold AND input is available to user program
363 * AND input flow control is enabled and not yet invoked.
364 * The 3 is slop for PARMRK.
365 */
366 iflag = tp->t_iflag;
367 if (tp->t_rawq.c_cc + tp->t_canq.c_cc > tp->t_ihiwat - 3 &&
368 (!ISSET(lflag, ICANON) || tp->t_canq.c_cc != 0) &&
369 (ISSET(tp->t_cflag, CRTS_IFLOW) || ISSET(iflag, IXOFF)) &&
370 !ISSET(tp->t_state, TS_TBLOCK))
371 ttyblock(tp);
372
373 /* Handle exceptional conditions (break, parity, framing). */
374 cc = tp->t_cc;
375 err = (ISSET(c, TTY_ERRORMASK));
376 if (err) {
377 CLR(c, TTY_ERRORMASK);
378 if (ISSET(err, TTY_BI)) {
379 if (ISSET(iflag, IGNBRK))
380 return (0);
381 if (ISSET(iflag, BRKINT)) {
382 ttyflush(tp, FREAD | FWRITE);
383 pgsignal(tp->t_pgrp, SIGINT, 1);
384 goto endcase;
385 }
386 if (ISSET(iflag, PARMRK))
387 goto parmrk;
388 } else if ((ISSET(err, TTY_PE) && ISSET(iflag, INPCK))
389 || ISSET(err, TTY_FE)) {
390 if (ISSET(iflag, IGNPAR))
391 return (0);
392 else if (ISSET(iflag, PARMRK)) {
393parmrk:
394 if (tp->t_rawq.c_cc + tp->t_canq.c_cc >
395 MAX_INPUT - 3)
396 goto input_overflow;
0ced1954
MD
397 clist_putc(0377 | TTY_QUOTE, &tp->t_rawq);
398 clist_putc(0 | TTY_QUOTE, &tp->t_rawq);
399 clist_putc(c | TTY_QUOTE, &tp->t_rawq);
984263bc
MD
400 goto endcase;
401 } else
402 c = 0;
403 }
404 }
405
406 if (!ISSET(tp->t_state, TS_TYPEN) && ISSET(iflag, ISTRIP))
407 CLR(c, 0x80);
408 if (!ISSET(lflag, EXTPROC)) {
409 /*
410 * Check for literal nexting very first
411 */
412 if (ISSET(tp->t_state, TS_LNCH)) {
413 SET(c, TTY_QUOTE);
414 CLR(tp->t_state, TS_LNCH);
415 }
416 /*
417 * Scan for special characters. This code
418 * is really just a big case statement with
419 * non-constant cases. The bottom of the
420 * case statement is labeled ``endcase'', so goto
421 * it after a case match, or similar.
422 */
423
424 /*
425 * Control chars which aren't controlled
426 * by ICANON, ISIG, or IXON.
427 */
428 if (ISSET(lflag, IEXTEN)) {
429 if (CCEQ(cc[VLNEXT], c)) {
430 if (ISSET(lflag, ECHO)) {
431 if (ISSET(lflag, ECHOE)) {
432 (void)ttyoutput('^', tp);
433 (void)ttyoutput('\b', tp);
434 } else
435 ttyecho(c, tp);
436 }
437 SET(tp->t_state, TS_LNCH);
438 goto endcase;
439 }
440 if (CCEQ(cc[VDISCARD], c)) {
441 if (ISSET(lflag, FLUSHO))
442 CLR(tp->t_lflag, FLUSHO);
443 else {
444 ttyflush(tp, FWRITE);
445 ttyecho(c, tp);
446 if (tp->t_rawq.c_cc + tp->t_canq.c_cc)
447 ttyretype(tp);
448 SET(tp->t_lflag, FLUSHO);
449 }
450 goto startoutput;
451 }
452 }
453 /*
454 * Signals.
455 */
456 if (ISSET(lflag, ISIG)) {
457 if (CCEQ(cc[VINTR], c) || CCEQ(cc[VQUIT], c)) {
458 if (!ISSET(lflag, NOFLSH))
459 ttyflush(tp, FREAD | FWRITE);
460 ttyecho(c, tp);
461 pgsignal(tp->t_pgrp,
462 CCEQ(cc[VINTR], c) ? SIGINT : SIGQUIT, 1);
463 goto endcase;
464 }
465 if (CCEQ(cc[VSUSP], c)) {
466 if (!ISSET(lflag, NOFLSH))
467 ttyflush(tp, FREAD);
468 ttyecho(c, tp);
469 pgsignal(tp->t_pgrp, SIGTSTP, 1);
470 goto endcase;
471 }
472 }
473 /*
474 * Handle start/stop characters.
475 */
476 if (ISSET(iflag, IXON)) {
477 if (CCEQ(cc[VSTOP], c)) {
478 if (!ISSET(tp->t_state, TS_TTSTOP)) {
479 SET(tp->t_state, TS_TTSTOP);
480 (*tp->t_stop)(tp, 0);
481 return (0);
482 }
483 if (!CCEQ(cc[VSTART], c))
484 return (0);
485 /*
486 * if VSTART == VSTOP then toggle
487 */
488 goto endcase;
489 }
490 if (CCEQ(cc[VSTART], c))
491 goto restartoutput;
492 }
493 /*
494 * IGNCR, ICRNL, & INLCR
495 */
496 if (c == '\r') {
497 if (ISSET(iflag, IGNCR))
498 return (0);
499 else if (ISSET(iflag, ICRNL))
500 c = '\n';
501 } else if (c == '\n' && ISSET(iflag, INLCR))
502 c = '\r';
503 }
504 if (!ISSET(tp->t_lflag, EXTPROC) && ISSET(lflag, ICANON)) {
505 /*
506 * From here on down canonical mode character
507 * processing takes place.
508 */
509 /*
510 * erase or erase2 (^H / ^?)
511 */
512 if (CCEQ(cc[VERASE], c) || CCEQ(cc[VERASE2], c) ) {
513 if (tp->t_rawq.c_cc)
0ced1954 514 ttyrub(clist_unputc(&tp->t_rawq), tp);
984263bc
MD
515 goto endcase;
516 }
517 /*
518 * kill (^U)
519 */
520 if (CCEQ(cc[VKILL], c)) {
521 if (ISSET(lflag, ECHOKE) &&
522 tp->t_rawq.c_cc == tp->t_rocount &&
523 !ISSET(lflag, ECHOPRT))
524 while (tp->t_rawq.c_cc)
0ced1954 525 ttyrub(clist_unputc(&tp->t_rawq), tp);
984263bc
MD
526 else {
527 ttyecho(c, tp);
528 if (ISSET(lflag, ECHOK) ||
529 ISSET(lflag, ECHOKE))
530 ttyecho('\n', tp);
531 FLUSHQ(&tp->t_rawq);
532 tp->t_rocount = 0;
533 }
534 CLR(tp->t_state, TS_LOCAL);
535 goto endcase;
536 }
537 /*
538 * word erase (^W)
539 */
540 if (CCEQ(cc[VWERASE], c) && ISSET(lflag, IEXTEN)) {
541 int ctype;
542
543 /*
544 * erase whitespace
545 */
0ced1954 546 while ((c = clist_unputc(&tp->t_rawq)) == ' ' || c == '\t')
984263bc
MD
547 ttyrub(c, tp);
548 if (c == -1)
549 goto endcase;
550 /*
551 * erase last char of word and remember the
552 * next chars type (for ALTWERASE)
553 */
554 ttyrub(c, tp);
0ced1954 555 c = clist_unputc(&tp->t_rawq);
984263bc
MD
556 if (c == -1)
557 goto endcase;
558 if (c == ' ' || c == '\t') {
0ced1954 559 clist_putc(c, &tp->t_rawq);
984263bc
MD
560 goto endcase;
561 }
562 ctype = ISALPHA(c);
563 /*
564 * erase rest of word
565 */
566 do {
567 ttyrub(c, tp);
0ced1954 568 c = clist_unputc(&tp->t_rawq);
984263bc
MD
569 if (c == -1)
570 goto endcase;
571 } while (c != ' ' && c != '\t' &&
572 (!ISSET(lflag, ALTWERASE) || ISALPHA(c) == ctype));
0ced1954 573 clist_putc(c, &tp->t_rawq);
984263bc
MD
574 goto endcase;
575 }
576 /*
577 * reprint line (^R)
578 */
579 if (CCEQ(cc[VREPRINT], c) && ISSET(lflag, IEXTEN)) {
580 ttyretype(tp);
581 goto endcase;
582 }
583 /*
584 * ^T - kernel info and generate SIGINFO
585 */
586 if (CCEQ(cc[VSTATUS], c) && ISSET(lflag, IEXTEN)) {
587 if (ISSET(lflag, ISIG))
588 pgsignal(tp->t_pgrp, SIGINFO, 1);
589 if (!ISSET(lflag, NOKERNINFO))
590 ttyinfo(tp);
591 goto endcase;
592 }
dcf5aa01
MD
593 if (CCEQ(cc[VCHECKPT], c) && ISSET(lflag, IEXTEN)) {
594 if (ISSET(lflag, ISIG))
595 pgsignal(tp->t_pgrp, SIGCKPT, 1);
596 goto endcase;
597 }
984263bc
MD
598 }
599 /*
600 * Check for input buffer overflow
601 */
602 if (tp->t_rawq.c_cc + tp->t_canq.c_cc >= MAX_INPUT) {
603input_overflow:
604 if (ISSET(iflag, IMAXBEL)) {
605 if (tp->t_outq.c_cc < tp->t_ohiwat)
606 (void)ttyoutput(CTRL('g'), tp);
607 }
608 goto endcase;
609 }
610
611 if ( c == 0377 && ISSET(iflag, PARMRK) && !ISSET(iflag, ISTRIP)
612 && ISSET(iflag, IGNBRK|IGNPAR) != (IGNBRK|IGNPAR))
0ced1954 613 clist_putc(0377 | TTY_QUOTE, &tp->t_rawq);
984263bc
MD
614
615 /*
616 * Put data char in q for user and
617 * wakeup on seeing a line delimiter.
618 */
0ced1954 619 if (clist_putc(c, &tp->t_rawq) >= 0) {
984263bc
MD
620 if (!ISSET(lflag, ICANON)) {
621 ttwakeup(tp);
622 ttyecho(c, tp);
623 goto endcase;
624 }
625 if (TTBREAKC(c, lflag)) {
626 tp->t_rocount = 0;
627 catq(&tp->t_rawq, &tp->t_canq);
628 ttwakeup(tp);
629 } else if (tp->t_rocount++ == 0)
630 tp->t_rocol = tp->t_column;
631 if (ISSET(tp->t_state, TS_ERASE)) {
632 /*
633 * end of prterase \.../
634 */
635 CLR(tp->t_state, TS_ERASE);
636 (void)ttyoutput('/', tp);
637 }
638 i = tp->t_column;
639 ttyecho(c, tp);
640 if (CCEQ(cc[VEOF], c) && ISSET(lflag, ECHO)) {
641 /*
642 * Place the cursor over the '^' of the ^D.
643 */
644 i = imin(2, tp->t_column - i);
645 while (i > 0) {
646 (void)ttyoutput('\b', tp);
647 i--;
648 }
649 }
650 }
651endcase:
652 /*
653 * IXANY means allow any character to restart output.
654 */
655 if (ISSET(tp->t_state, TS_TTSTOP) &&
656 !ISSET(iflag, IXANY) && cc[VSTART] != cc[VSTOP])
657 return (0);
658restartoutput:
659 CLR(tp->t_lflag, FLUSHO);
660 CLR(tp->t_state, TS_TTSTOP);
661startoutput:
662 return (ttstart(tp));
663}
664
665/*
666 * Output a single character on a tty, doing output processing
667 * as needed (expanding tabs, newline processing, etc.).
668 * Returns < 0 if succeeds, otherwise returns char to resend.
669 * Must be recursive.
670 */
671static int
672ttyoutput(c, tp)
1fd87d54
RG
673 int c;
674 struct tty *tp;
984263bc 675{
1fd87d54 676 tcflag_t oflag;
e43a034f 677 int col;
984263bc
MD
678
679 oflag = tp->t_oflag;
680 if (!ISSET(oflag, OPOST)) {
681 if (ISSET(tp->t_lflag, FLUSHO))
682 return (-1);
0ced1954 683 if (clist_putc(c, &tp->t_outq))
984263bc
MD
684 return (c);
685 tk_nout++;
686 tp->t_outcc++;
687 return (-1);
688 }
689 /*
690 * Do tab expansion if OXTABS is set. Special case if we external
691 * processing, we don't do the tab expansion because we'll probably
692 * get it wrong. If tab expansion needs to be done, let it happen
693 * externally.
694 */
695 CLR(c, ~TTY_CHARMASK);
696 if (c == '\t' &&
697 ISSET(oflag, OXTABS) && !ISSET(tp->t_lflag, EXTPROC)) {
698 c = 8 - (tp->t_column & 7);
699 if (!ISSET(tp->t_lflag, FLUSHO)) {
e43a034f 700 crit_enter(); /* Don't interrupt tabs. */
984263bc
MD
701 c -= b_to_q(" ", c, &tp->t_outq);
702 tk_nout += c;
703 tp->t_outcc += c;
e43a034f 704 crit_exit();
984263bc
MD
705 }
706 tp->t_column += c;
707 return (c ? -1 : '\t');
708 }
709 if (c == CEOT && ISSET(oflag, ONOEOT))
710 return (-1);
711
712 /*
713 * Newline translation: if ONLCR is set,
714 * translate newline into "\r\n".
715 */
716 if (c == '\n' && ISSET(tp->t_oflag, ONLCR)) {
717 tk_nout++;
718 tp->t_outcc++;
0ced1954 719 if (!ISSET(tp->t_lflag, FLUSHO) && clist_putc('\r', &tp->t_outq))
984263bc
MD
720 return (c);
721 }
722 /* If OCRNL is set, translate "\r" into "\n". */
723 else if (c == '\r' && ISSET(tp->t_oflag, OCRNL))
724 c = '\n';
725 /* If ONOCR is set, don't transmit CRs when on column 0. */
726 else if (c == '\r' && ISSET(tp->t_oflag, ONOCR) && tp->t_column == 0)
727 return (-1);
728
729 tk_nout++;
730 tp->t_outcc++;
0ced1954 731 if (!ISSET(tp->t_lflag, FLUSHO) && clist_putc(c, &tp->t_outq))
984263bc
MD
732 return (c);
733
734 col = tp->t_column;
735 switch (CCLASS(c)) {
736 case BACKSPACE:
737 if (col > 0)
738 --col;
739 break;
740 case CONTROL:
741 break;
742 case NEWLINE:
743 if (ISSET(tp->t_oflag, ONLCR | ONLRET))
744 col = 0;
745 break;
746 case RETURN:
747 col = 0;
748 break;
749 case ORDINARY:
750 ++col;
751 break;
752 case TAB:
753 col = (col + 8) & ~7;
754 break;
755 }
756 tp->t_column = col;
757 return (-1);
758}
759
760/*
761 * Ioctls for all tty devices. Called after line-discipline specific ioctl
762 * has been called to do discipline-specific functions and/or reject any
763 * of these ioctl commands.
764 */
765/* ARGSUSED */
766int
dadab5e9 767ttioctl(struct tty *tp, u_long cmd, void *data, int flag)
984263bc 768{
dadab5e9
MD
769 struct thread *td = curthread;
770 struct proc *p = td->td_proc;
e43a034f 771 int error;
984263bc 772
dadab5e9
MD
773 KKASSERT(p);
774
984263bc
MD
775 /* If the ioctl involves modification, hang if in the background. */
776 switch (cmd) {
777 case TIOCCBRK:
778 case TIOCCONS:
779 case TIOCDRAIN:
780 case TIOCEXCL:
781 case TIOCFLUSH:
782#ifdef TIOCHPCL
783 case TIOCHPCL:
784#endif
785 case TIOCNXCL:
786 case TIOCSBRK:
787 case TIOCSCTTY:
788 case TIOCSDRAINWAIT:
789 case TIOCSETA:
790 case TIOCSETAF:
791 case TIOCSETAW:
792 case TIOCSETD:
793 case TIOCSPGRP:
794 case TIOCSTART:
795 case TIOCSTAT:
796 case TIOCSTI:
797 case TIOCSTOP:
798 case TIOCSWINSZ:
799#if defined(COMPAT_43) || defined(COMPAT_SUNOS)
800 case TIOCLBIC:
801 case TIOCLBIS:
802 case TIOCLSET:
803 case TIOCSETC:
804 case OTIOCSETD:
805 case TIOCSETN:
806 case TIOCSETP:
807 case TIOCSLTC:
808#endif
809 while (isbackground(p, tp) && !(p->p_flag & P_PPWAIT) &&
810 !SIGISMEMBER(p->p_sigignore, SIGTTOU) &&
811 !SIGISMEMBER(p->p_sigmask, SIGTTOU)) {
812 if (p->p_pgrp->pg_jobc == 0)
813 return (EIO);
814 pgsignal(p->p_pgrp, SIGTTOU, 1);
377d4740 815 error = ttysleep(tp, &lbolt, PCATCH, "ttybg1",
984263bc
MD
816 0);
817 if (error)
818 return (error);
819 }
820 break;
821 }
822
823 switch (cmd) { /* Process the ioctl. */
824 case FIOASYNC: /* set/clear async i/o */
e43a034f 825 crit_enter();
984263bc
MD
826 if (*(int *)data)
827 SET(tp->t_state, TS_ASYNC);
828 else
829 CLR(tp->t_state, TS_ASYNC);
e43a034f 830 crit_exit();
984263bc 831 break;
984263bc 832 case FIONREAD: /* get # bytes to read */
e43a034f 833 crit_enter();
984263bc 834 *(int *)data = ttnread(tp);
e43a034f 835 crit_exit();
984263bc
MD
836 break;
837
838 case FIOSETOWN:
839 /*
840 * Policy -- Don't allow FIOSETOWN on someone else's
841 * controlling tty
842 */
843 if (tp->t_session != NULL && !isctty(p, tp))
844 return (ENOTTY);
845
846 error = fsetown(*(int *)data, &tp->t_sigio);
847 if (error)
848 return (error);
849 break;
850 case FIOGETOWN:
851 if (tp->t_session != NULL && !isctty(p, tp))
852 return (ENOTTY);
853 *(int *)data = fgetown(tp->t_sigio);
854 break;
855
856 case TIOCEXCL: /* set exclusive use of tty */
e43a034f 857 crit_enter();
984263bc 858 SET(tp->t_state, TS_XCLUDE);
e43a034f 859 crit_exit();
984263bc
MD
860 break;
861 case TIOCFLUSH: { /* flush buffers */
1fd87d54 862 int flags = *(int *)data;
984263bc
MD
863
864 if (flags == 0)
865 flags = FREAD | FWRITE;
866 else
867 flags &= FREAD | FWRITE;
868 ttyflush(tp, flags);
869 break;
870 }
871 case TIOCCONS: /* become virtual console */
872 if (*(int *)data) {
873 if (constty && constty != tp &&
874 ISSET(constty->t_state, TS_CONNECTED))
875 return (EBUSY);
876#ifndef UCONSOLE
dadab5e9 877 if ((error = suser(td)) != 0)
984263bc
MD
878 return (error);
879#endif
880 constty = tp;
881 } else if (tp == constty)
882 constty = NULL;
883 break;
884 case TIOCDRAIN: /* wait till output drained */
885 error = ttywait(tp);
886 if (error)
887 return (error);
888 break;
889 case TIOCGETA: { /* get termios struct */
890 struct termios *t = (struct termios *)data;
891
892 bcopy(&tp->t_termios, t, sizeof(struct termios));
893 break;
894 }
895 case TIOCGETD: /* get line discipline */
896 *(int *)data = tp->t_line;
897 break;
898 case TIOCGWINSZ: /* get window size */
899 *(struct winsize *)data = tp->t_winsize;
900 break;
901 case TIOCGPGRP: /* get pgrp of tty */
902 if (!isctty(p, tp))
903 return (ENOTTY);
904 *(int *)data = tp->t_pgrp ? tp->t_pgrp->pg_id : NO_PID;
905 break;
906#ifdef TIOCHPCL
907 case TIOCHPCL: /* hang up on last close */
e43a034f 908 crit_enter();
984263bc 909 SET(tp->t_cflag, HUPCL);
e43a034f 910 crit_exit();
984263bc
MD
911 break;
912#endif
913 case TIOCNXCL: /* reset exclusive use of tty */
e43a034f 914 crit_enter();
984263bc 915 CLR(tp->t_state, TS_XCLUDE);
e43a034f 916 crit_exit();
984263bc
MD
917 break;
918 case TIOCOUTQ: /* output queue size */
919 *(int *)data = tp->t_outq.c_cc;
920 break;
921 case TIOCSETA: /* set termios struct */
922 case TIOCSETAW: /* drain output, set */
923 case TIOCSETAF: { /* drn out, fls in, set */
1fd87d54 924 struct termios *t = (struct termios *)data;
984263bc
MD
925
926 if (t->c_ispeed == 0)
927 t->c_ispeed = t->c_ospeed;
928 if (t->c_ispeed == 0)
929 t->c_ispeed = tp->t_ospeed;
930 if (t->c_ispeed == 0)
931 return (EINVAL);
e43a034f 932 crit_enter();
984263bc
MD
933 if (cmd == TIOCSETAW || cmd == TIOCSETAF) {
934 error = ttywait(tp);
935 if (error) {
e43a034f 936 crit_exit();
984263bc
MD
937 return (error);
938 }
939 if (cmd == TIOCSETAF)
940 ttyflush(tp, FREAD);
941 }
942 if (!ISSET(t->c_cflag, CIGNORE)) {
943 /*
944 * Set device hardware.
945 */
946 if (tp->t_param && (error = (*tp->t_param)(tp, t))) {
e43a034f 947 crit_exit();
984263bc
MD
948 return (error);
949 }
950 if (ISSET(t->c_cflag, CLOCAL) &&
951 !ISSET(tp->t_cflag, CLOCAL)) {
952 /*
953 * XXX disconnections would be too hard to
954 * get rid of without this kludge. The only
955 * way to get rid of controlling terminals
956 * is to exit from the session leader.
957 */
958 CLR(tp->t_state, TS_ZOMBIE);
959
960 wakeup(TSA_CARR_ON(tp));
961 ttwakeup(tp);
962 ttwwakeup(tp);
963 }
964 if ((ISSET(tp->t_state, TS_CARR_ON) ||
965 ISSET(t->c_cflag, CLOCAL)) &&
966 !ISSET(tp->t_state, TS_ZOMBIE))
967 SET(tp->t_state, TS_CONNECTED);
968 else
969 CLR(tp->t_state, TS_CONNECTED);
970 tp->t_cflag = t->c_cflag;
971 tp->t_ispeed = t->c_ispeed;
972 if (t->c_ospeed != 0)
973 tp->t_ospeed = t->c_ospeed;
974 ttsetwater(tp);
975 }
976 if (ISSET(t->c_lflag, ICANON) != ISSET(tp->t_lflag, ICANON) &&
977 cmd != TIOCSETAF) {
978 if (ISSET(t->c_lflag, ICANON))
979 SET(tp->t_lflag, PENDIN);
980 else {
981 /*
982 * XXX we really shouldn't allow toggling
983 * ICANON while we're in a non-termios line
984 * discipline. Now we have to worry about
985 * panicing for a null queue.
986 */
987 if (tp->t_canq.c_cbreserved > 0 &&
988 tp->t_rawq.c_cbreserved > 0) {
989 catq(&tp->t_rawq, &tp->t_canq);
990 /*
991 * XXX the queue limits may be
992 * different, so the old queue
993 * swapping method no longer works.
994 */
995 catq(&tp->t_canq, &tp->t_rawq);
996 }
997 CLR(tp->t_lflag, PENDIN);
998 }
999 ttwakeup(tp);
1000 }
1001 tp->t_iflag = t->c_iflag;
1002 tp->t_oflag = t->c_oflag;
1003 /*
1004 * Make the EXTPROC bit read only.
1005 */
1006 if (ISSET(tp->t_lflag, EXTPROC))
1007 SET(t->c_lflag, EXTPROC);
1008 else
1009 CLR(t->c_lflag, EXTPROC);
1010 tp->t_lflag = t->c_lflag | ISSET(tp->t_lflag, PENDIN);
1011 if (t->c_cc[VMIN] != tp->t_cc[VMIN] ||
1012 t->c_cc[VTIME] != tp->t_cc[VTIME])
1013 ttwakeup(tp);
1014 bcopy(t->c_cc, tp->t_cc, sizeof(t->c_cc));
e43a034f 1015 crit_exit();
984263bc
MD
1016 break;
1017 }
1018 case TIOCSETD: { /* set line discipline */
1fd87d54 1019 int t = *(int *)data;
b13267a5 1020 cdev_t device = tp->t_dev;
984263bc
MD
1021
1022 if ((u_int)t >= nlinesw)
1023 return (ENXIO);
1024 if (t != tp->t_line) {
e43a034f 1025 crit_enter();
984263bc
MD
1026 (*linesw[tp->t_line].l_close)(tp, flag);
1027 error = (*linesw[t].l_open)(device, tp);
1028 if (error) {
1029 (void)(*linesw[tp->t_line].l_open)(device, tp);
e43a034f 1030 crit_exit();
984263bc
MD
1031 return (error);
1032 }
1033 tp->t_line = t;
e43a034f 1034 crit_exit();
984263bc
MD
1035 }
1036 break;
1037 }
1038 case TIOCSTART: /* start output, like ^Q */
e43a034f 1039 crit_enter();
984263bc
MD
1040 if (ISSET(tp->t_state, TS_TTSTOP) ||
1041 ISSET(tp->t_lflag, FLUSHO)) {
1042 CLR(tp->t_lflag, FLUSHO);
1043 CLR(tp->t_state, TS_TTSTOP);
1044 ttstart(tp);
1045 }
e43a034f 1046 crit_exit();
984263bc
MD
1047 break;
1048 case TIOCSTI: /* simulate terminal input */
dadab5e9 1049 if ((flag & FREAD) == 0 && suser(td))
984263bc 1050 return (EPERM);
dadab5e9 1051 if (!isctty(p, tp) && suser(td))
984263bc 1052 return (EACCES);
e43a034f 1053 crit_enter();
984263bc 1054 (*linesw[tp->t_line].l_rint)(*(u_char *)data, tp);
e43a034f 1055 crit_exit();
984263bc
MD
1056 break;
1057 case TIOCSTOP: /* stop output, like ^S */
e43a034f 1058 crit_enter();
984263bc
MD
1059 if (!ISSET(tp->t_state, TS_TTSTOP)) {
1060 SET(tp->t_state, TS_TTSTOP);
1061 (*tp->t_stop)(tp, 0);
1062 }
e43a034f 1063 crit_exit();
984263bc
MD
1064 break;
1065 case TIOCSCTTY: /* become controlling tty */
1066 /* Session ctty vnode pointer set in vnode layer. */
1067 if (!SESS_LEADER(p) ||
1068 ((p->p_session->s_ttyvp || tp->t_session) &&
1069 (tp->t_session != p->p_session)))
1070 return (EPERM);
1071 tp->t_session = p->p_session;
1072 tp->t_pgrp = p->p_pgrp;
1073 p->p_session->s_ttyp = tp;
1074 p->p_flag |= P_CONTROLT;
1075 break;
1076 case TIOCSPGRP: { /* set pgrp of tty */
1fd87d54 1077 struct pgrp *pgrp = pgfind(*(int *)data);
984263bc
MD
1078
1079 if (!isctty(p, tp))
1080 return (ENOTTY);
1081 else if (pgrp == NULL || pgrp->pg_session != p->p_session)
1082 return (EPERM);
1083 tp->t_pgrp = pgrp;
1084 break;
1085 }
1086 case TIOCSTAT: /* simulate control-T */
e43a034f 1087 crit_enter();
984263bc 1088 ttyinfo(tp);
e43a034f 1089 crit_exit();
984263bc
MD
1090 break;
1091 case TIOCSWINSZ: /* set window size */
1092 if (bcmp((caddr_t)&tp->t_winsize, data,
1093 sizeof (struct winsize))) {
1094 tp->t_winsize = *(struct winsize *)data;
1095 pgsignal(tp->t_pgrp, SIGWINCH, 1);
1096 }
1097 break;
1098 case TIOCSDRAINWAIT:
dadab5e9 1099 error = suser(td);
984263bc
MD
1100 if (error)
1101 return (error);
1102 tp->t_timeout = *(int *)data * hz;
1103 wakeup(TSA_OCOMPLETE(tp));
1104 wakeup(TSA_OLOWAT(tp));
1105 break;
1106 case TIOCGDRAINWAIT:
1107 *(int *)data = tp->t_timeout / hz;
1108 break;
1109 default:
1110#if defined(COMPAT_43) || defined(COMPAT_SUNOS)
1111 return (ttcompat(tp, cmd, data, flag));
1112#else
1113 return (ENOIOCTL);
1114#endif
1115 }
1116 return (0);
1117}
1118
1119int
fef8985e 1120ttypoll(struct dev_poll_args *ap)
984263bc 1121{
b13267a5 1122 cdev_t dev = ap->a_head.a_dev;
fef8985e 1123 int events = ap->a_events;
984263bc
MD
1124 int revents = 0;
1125 struct tty *tp;
1126
1127 tp = dev->si_tty;
fef8985e
MD
1128 /* XXX used to return ENXIO, but that means true! */
1129 if (tp == NULL) {
1130 ap->a_events = (events & (POLLIN | POLLOUT | POLLRDNORM |
1131 POLLWRNORM)) | POLLHUP;
1132 return(0);
1133 }
984263bc 1134
e43a034f 1135 crit_enter();
984263bc
MD
1136 if (events & (POLLIN | POLLRDNORM)) {
1137 if (ttnread(tp) > 0 || ISSET(tp->t_state, TS_ZOMBIE))
1138 revents |= events & (POLLIN | POLLRDNORM);
1139 else
fef8985e 1140 selrecord(curthread, &tp->t_rsel);
984263bc
MD
1141 }
1142 if (events & (POLLOUT | POLLWRNORM)) {
1143 if ((tp->t_outq.c_cc <= tp->t_olowat &&
1144 ISSET(tp->t_state, TS_CONNECTED))
1145 || ISSET(tp->t_state, TS_ZOMBIE))
1146 revents |= events & (POLLOUT | POLLWRNORM);
1147 else
fef8985e 1148 selrecord(curthread, &tp->t_wsel);
984263bc 1149 }
e43a034f 1150 crit_exit();
fef8985e
MD
1151 ap->a_events = revents;
1152 return (0);
984263bc
MD
1153}
1154
1155static struct filterops ttyread_filtops =
1156 { 1, NULL, filt_ttyrdetach, filt_ttyread };
1157static struct filterops ttywrite_filtops =
1158 { 1, NULL, filt_ttywdetach, filt_ttywrite };
1159
1160int
fef8985e 1161ttykqfilter(struct dev_kqfilter_args *ap)
984263bc 1162{
b13267a5 1163 cdev_t dev = ap->a_head.a_dev;
fef8985e 1164 struct knote *kn = ap->a_kn;
984263bc
MD
1165 struct tty *tp = dev->si_tty;
1166 struct klist *klist;
984263bc 1167
fef8985e 1168 ap->a_result = 0;
984263bc
MD
1169 switch (kn->kn_filter) {
1170 case EVFILT_READ:
1171 klist = &tp->t_rsel.si_note;
1172 kn->kn_fop = &ttyread_filtops;
1173 break;
1174 case EVFILT_WRITE:
1175 klist = &tp->t_wsel.si_note;
1176 kn->kn_fop = &ttywrite_filtops;
1177 break;
1178 default:
fef8985e
MD
1179 ap->a_result = 1;
1180 return (0);
984263bc
MD
1181 }
1182
1183 kn->kn_hook = (caddr_t)dev;
1184
e43a034f 1185 crit_enter();
984263bc 1186 SLIST_INSERT_HEAD(klist, kn, kn_selnext);
e43a034f 1187 crit_exit();
984263bc
MD
1188
1189 return (0);
1190}
1191
1192static void
1193filt_ttyrdetach(struct knote *kn)
1194{
b13267a5 1195 struct tty *tp = ((cdev_t)kn->kn_hook)->si_tty;
984263bc 1196
e43a034f 1197 crit_enter();
984263bc 1198 SLIST_REMOVE(&tp->t_rsel.si_note, kn, knote, kn_selnext);
e43a034f 1199 crit_exit();
984263bc
MD
1200}
1201
1202static int
1203filt_ttyread(struct knote *kn, long hint)
1204{
b13267a5 1205 struct tty *tp = ((cdev_t)kn->kn_hook)->si_tty;
984263bc
MD
1206
1207 kn->kn_data = ttnread(tp);
1208 if (ISSET(tp->t_state, TS_ZOMBIE)) {
1209 kn->kn_flags |= EV_EOF;
1210 return (1);
1211 }
1212 return (kn->kn_data > 0);
1213}
1214
1215static void
1216filt_ttywdetach(struct knote *kn)
1217{
b13267a5 1218 struct tty *tp = ((cdev_t)kn->kn_hook)->si_tty;
984263bc 1219
e43a034f 1220 crit_enter();
984263bc 1221 SLIST_REMOVE(&tp->t_wsel.si_note, kn, knote, kn_selnext);
e43a034f 1222 crit_exit();
984263bc
MD
1223}
1224
1225static int
1226filt_ttywrite(kn, hint)
1227 struct knote *kn;
1228 long hint;
1229{
b13267a5 1230 struct tty *tp = ((cdev_t)kn->kn_hook)->si_tty;
984263bc
MD
1231
1232 kn->kn_data = tp->t_outq.c_cc;
1233 if (ISSET(tp->t_state, TS_ZOMBIE))
1234 return (1);
1235 return (kn->kn_data <= tp->t_olowat &&
1236 ISSET(tp->t_state, TS_CONNECTED));
1237}
1238
1239/*
e43a034f 1240 * Must be called while in a critical section.
984263bc
MD
1241 */
1242static int
1243ttnread(tp)
1244 struct tty *tp;
1245{
1246 int nread;
1247
1248 if (ISSET(tp->t_lflag, PENDIN))
1249 ttypend(tp);
1250 nread = tp->t_canq.c_cc;
1251 if (!ISSET(tp->t_lflag, ICANON)) {
1252 nread += tp->t_rawq.c_cc;
1253 if (nread < tp->t_cc[VMIN] && tp->t_cc[VTIME] == 0)
1254 nread = 0;
1255 }
1256 return (nread);
1257}
1258
1259/*
1260 * Wait for output to drain.
1261 */
1262int
1263ttywait(tp)
1fd87d54 1264 struct tty *tp;
984263bc 1265{
e43a034f 1266 int error;
984263bc
MD
1267
1268 error = 0;
e43a034f 1269 crit_enter();
984263bc
MD
1270 while ((tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY)) &&
1271 ISSET(tp->t_state, TS_CONNECTED) && tp->t_oproc) {
1272 (*tp->t_oproc)(tp);
1273 if ((tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY)) &&
1274 ISSET(tp->t_state, TS_CONNECTED)) {
1275 SET(tp->t_state, TS_SO_OCOMPLETE);
1276 error = ttysleep(tp, TSA_OCOMPLETE(tp),
377d4740 1277 PCATCH, "ttywai",
984263bc
MD
1278 tp->t_timeout);
1279 if (error) {
1280 if (error == EWOULDBLOCK)
1281 error = EIO;
1282 break;
1283 }
1284 } else
1285 break;
1286 }
1287 if (!error && (tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY)))
1288 error = EIO;
e43a034f 1289 crit_exit();
984263bc
MD
1290 return (error);
1291}
1292
1293/*
1294 * Flush if successfully wait.
1295 */
1296static int
1297ttywflush(tp)
1298 struct tty *tp;
1299{
1300 int error;
1301
1302 if ((error = ttywait(tp)) == 0)
1303 ttyflush(tp, FREAD);
1304 return (error);
1305}
1306
1307/*
1308 * Flush tty read and/or write queues, notifying anyone waiting.
1309 */
1310void
1311ttyflush(tp, rw)
1fd87d54 1312 struct tty *tp;
984263bc
MD
1313 int rw;
1314{
e43a034f 1315 crit_enter();
984263bc
MD
1316#if 0
1317again:
1318#endif
1319 if (rw & FWRITE) {
1320 FLUSHQ(&tp->t_outq);
1321 CLR(tp->t_state, TS_TTSTOP);
1322 }
1323 (*tp->t_stop)(tp, rw);
1324 if (rw & FREAD) {
1325 FLUSHQ(&tp->t_canq);
1326 FLUSHQ(&tp->t_rawq);
1327 CLR(tp->t_lflag, PENDIN);
1328 tp->t_rocount = 0;
1329 tp->t_rocol = 0;
1330 CLR(tp->t_state, TS_LOCAL);
1331 ttwakeup(tp);
1332 if (ISSET(tp->t_state, TS_TBLOCK)) {
1333 if (rw & FWRITE)
1334 FLUSHQ(&tp->t_outq);
1335 ttyunblock(tp);
1336
1337 /*
1338 * Don't let leave any state that might clobber the
1339 * next line discipline (although we should do more
1340 * to send the START char). Not clearing the state
1341 * may have caused the "putc to a clist with no
1342 * reserved cblocks" panic/printf.
1343 */
1344 CLR(tp->t_state, TS_TBLOCK);
1345
1346#if 0 /* forget it, sleeping isn't always safe and we don't know when it is */
1347 if (ISSET(tp->t_iflag, IXOFF)) {
1348 /*
1349 * XXX wait a bit in the hope that the stop
1350 * character (if any) will go out. Waiting
1351 * isn't good since it allows races. This
1352 * will be fixed when the stop character is
1353 * put in a special queue. Don't bother with
1354 * the checks in ttywait() since the timeout
1355 * will save us.
1356 */
1357 SET(tp->t_state, TS_SO_OCOMPLETE);
377d4740 1358 ttysleep(tp, TSA_OCOMPLETE(tp), 0,
984263bc
MD
1359 "ttyfls", hz / 10);
1360 /*
1361 * Don't try sending the stop character again.
1362 */
1363 CLR(tp->t_state, TS_TBLOCK);
1364 goto again;
1365 }
1366#endif
1367 }
1368 }
1369 if (rw & FWRITE) {
1370 FLUSHQ(&tp->t_outq);
1371 ttwwakeup(tp);
1372 }
e43a034f 1373 crit_exit();
984263bc
MD
1374}
1375
1376/*
1377 * Copy in the default termios characters.
1378 */
1379void
1380termioschars(t)
1381 struct termios *t;
1382{
1383
1384 bcopy(ttydefchars, t->c_cc, sizeof t->c_cc);
1385}
1386
1387/*
1388 * Old interface.
1389 */
1390void
1391ttychars(tp)
1392 struct tty *tp;
1393{
1394
1395 termioschars(&tp->t_termios);
1396}
1397
1398/*
1399 * Handle input high water. Send stop character for the IXOFF case. Turn
1400 * on our input flow control bit and propagate the changes to the driver.
1401 * XXX the stop character should be put in a special high priority queue.
1402 */
1403void
1404ttyblock(tp)
1405 struct tty *tp;
1406{
1407
1408 SET(tp->t_state, TS_TBLOCK);
1409 if (ISSET(tp->t_iflag, IXOFF) && tp->t_cc[VSTOP] != _POSIX_VDISABLE &&
0ced1954 1410 clist_putc(tp->t_cc[VSTOP], &tp->t_outq) != 0)
984263bc
MD
1411 CLR(tp->t_state, TS_TBLOCK); /* try again later */
1412 ttstart(tp);
1413}
1414
1415/*
1416 * Handle input low water. Send start character for the IXOFF case. Turn
1417 * off our input flow control bit and propagate the changes to the driver.
1418 * XXX the start character should be put in a special high priority queue.
1419 */
1420static void
1421ttyunblock(tp)
1422 struct tty *tp;
1423{
1424
1425 CLR(tp->t_state, TS_TBLOCK);
1426 if (ISSET(tp->t_iflag, IXOFF) && tp->t_cc[VSTART] != _POSIX_VDISABLE &&
0ced1954 1427 clist_putc(tp->t_cc[VSTART], &tp->t_outq) != 0)
984263bc
MD
1428 SET(tp->t_state, TS_TBLOCK); /* try again later */
1429 ttstart(tp);
1430}
1431
1432#ifdef notyet
1433/* Not used by any current (i386) drivers. */
1434/*
1435 * Restart after an inter-char delay.
1436 */
1437void
1438ttrstrt(tp_arg)
1439 void *tp_arg;
1440{
1441 struct tty *tp;
984263bc
MD
1442
1443 KASSERT(tp_arg != NULL, ("ttrstrt"));
1444
1445 tp = tp_arg;
e43a034f 1446 crit_enter();
984263bc
MD
1447 CLR(tp->t_state, TS_TIMEOUT);
1448 ttstart(tp);
e43a034f 1449 crit_exit();
984263bc
MD
1450}
1451#endif
1452
1453int
1454ttstart(tp)
1455 struct tty *tp;
1456{
1457
1458 if (tp->t_oproc != NULL) /* XXX: Kludge for pty. */
1459 (*tp->t_oproc)(tp);
1460 return (0);
1461}
1462
1463/*
1464 * "close" a line discipline
1465 */
1466int
1467ttylclose(tp, flag)
1468 struct tty *tp;
1469 int flag;
1470{
1471
1472 if (flag & FNONBLOCK || ttywflush(tp))
1473 ttyflush(tp, FREAD | FWRITE);
1474 return (0);
1475}
1476
1477/*
1478 * Handle modem control transition on a tty.
1479 * Flag indicates new state of carrier.
1480 * Returns 0 if the line should be turned off, otherwise 1.
1481 */
1482int
1483ttymodem(tp, flag)
1fd87d54 1484 struct tty *tp;
984263bc
MD
1485 int flag;
1486{
1487
1488 if (ISSET(tp->t_state, TS_CARR_ON) && ISSET(tp->t_cflag, MDMBUF)) {
1489 /*
1490 * MDMBUF: do flow control according to carrier flag
1491 * XXX TS_CAR_OFLOW doesn't do anything yet. TS_TTSTOP
1492 * works if IXON and IXANY are clear.
1493 */
1494 if (flag) {
1495 CLR(tp->t_state, TS_CAR_OFLOW);
1496 CLR(tp->t_state, TS_TTSTOP);
1497 ttstart(tp);
1498 } else if (!ISSET(tp->t_state, TS_CAR_OFLOW)) {
1499 SET(tp->t_state, TS_CAR_OFLOW);
1500 SET(tp->t_state, TS_TTSTOP);
1501 (*tp->t_stop)(tp, 0);
1502 }
1503 } else if (flag == 0) {
1504 /*
1505 * Lost carrier.
1506 */
1507 CLR(tp->t_state, TS_CARR_ON);
1508 if (ISSET(tp->t_state, TS_ISOPEN) &&
1509 !ISSET(tp->t_cflag, CLOCAL)) {
1510 SET(tp->t_state, TS_ZOMBIE);
1511 CLR(tp->t_state, TS_CONNECTED);
1512 if (tp->t_session && tp->t_session->s_leader)
84204577 1513 ksignal(tp->t_session->s_leader, SIGHUP);
984263bc
MD
1514 ttyflush(tp, FREAD | FWRITE);
1515 return (0);
1516 }
1517 } else {
1518 /*
1519 * Carrier now on.
1520 */
1521 SET(tp->t_state, TS_CARR_ON);
1522 if (!ISSET(tp->t_state, TS_ZOMBIE))
1523 SET(tp->t_state, TS_CONNECTED);
1524 wakeup(TSA_CARR_ON(tp));
1525 ttwakeup(tp);
1526 ttwwakeup(tp);
1527 }
1528 return (1);
1529}
1530
1531/*
1532 * Reinput pending characters after state switch
e43a034f 1533 * call from a critical section.
984263bc
MD
1534 */
1535static void
1536ttypend(tp)
1fd87d54 1537 struct tty *tp;
984263bc
MD
1538{
1539 struct clist tq;
1fd87d54 1540 int c;
984263bc
MD
1541
1542 CLR(tp->t_lflag, PENDIN);
1543 SET(tp->t_state, TS_TYPEN);
1544 /*
1545 * XXX this assumes too much about clist internals. It may even
1546 * fail if the cblock slush pool is empty. We can't allocate more
1547 * cblocks here because we are called from an interrupt handler
1548 * and clist_alloc_cblocks() can wait.
1549 */
1550 tq = tp->t_rawq;
1551 bzero(&tp->t_rawq, sizeof tp->t_rawq);
1552 tp->t_rawq.c_cbmax = tq.c_cbmax;
1553 tp->t_rawq.c_cbreserved = tq.c_cbreserved;
0ced1954 1554 while ((c = clist_getc(&tq)) >= 0)
984263bc
MD
1555 ttyinput(c, tp);
1556 CLR(tp->t_state, TS_TYPEN);
1557}
1558
1559/*
1560 * Process a read call on a tty device.
1561 */
1562int
1563ttread(tp, uio, flag)
1fd87d54 1564 struct tty *tp;
984263bc
MD
1565 struct uio *uio;
1566 int flag;
1567{
1fd87d54
RG
1568 struct clist *qp;
1569 int c;
1570 tcflag_t lflag;
1571 cc_t *cc = tp->t_cc;
142dd704 1572 struct proc *pp;
e43a034f 1573 int first, error = 0;
984263bc
MD
1574 int has_stime = 0, last_cc = 0;
1575 long slp = 0; /* XXX this should be renamed `timo'. */
1576 struct timeval stime;
1577
1578loop:
e43a034f 1579 crit_enter();
984263bc
MD
1580 lflag = tp->t_lflag;
1581 /*
1582 * take pending input first
1583 */
1584 if (ISSET(lflag, PENDIN)) {
1585 ttypend(tp);
e43a034f 1586 splz(); /* reduce latency */
984263bc
MD
1587 lflag = tp->t_lflag; /* XXX ttypend() clobbers it */
1588 }
1589
1590 /*
1591 * Hang process if it's in the background.
1592 */
142dd704 1593 if ((pp = curproc) && isbackground(pp, tp)) {
e43a034f 1594 crit_exit();
142dd704
MD
1595 if (SIGISMEMBER(pp->p_sigignore, SIGTTIN) ||
1596 SIGISMEMBER(pp->p_sigmask, SIGTTIN) ||
1597 (pp->p_flag & P_PPWAIT) || pp->p_pgrp->pg_jobc == 0)
984263bc 1598 return (EIO);
142dd704 1599 pgsignal(pp->p_pgrp, SIGTTIN, 1);
377d4740 1600 error = ttysleep(tp, &lbolt, PCATCH, "ttybg2", 0);
984263bc
MD
1601 if (error)
1602 return (error);
1603 goto loop;
1604 }
1605
1606 if (ISSET(tp->t_state, TS_ZOMBIE)) {
e43a034f 1607 crit_exit();
984263bc
MD
1608 return (0); /* EOF */
1609 }
1610
1611 /*
1612 * If canonical, use the canonical queue,
1613 * else use the raw queue.
1614 *
1615 * (should get rid of clists...)
1616 */
1617 qp = ISSET(lflag, ICANON) ? &tp->t_canq : &tp->t_rawq;
1618
1619 if (flag & IO_NDELAY) {
1620 if (qp->c_cc > 0)
1621 goto read;
1622 if (!ISSET(lflag, ICANON) && cc[VMIN] == 0) {
e43a034f 1623 crit_exit();
984263bc
MD
1624 return (0);
1625 }
e43a034f 1626 crit_exit();
984263bc
MD
1627 return (EWOULDBLOCK);
1628 }
1629 if (!ISSET(lflag, ICANON)) {
1630 int m = cc[VMIN];
1631 long t = cc[VTIME];
1632 struct timeval timecopy;
1633
1634 /*
1635 * Check each of the four combinations.
1636 * (m > 0 && t == 0) is the normal read case.
1637 * It should be fairly efficient, so we check that and its
1638 * companion case (m == 0 && t == 0) first.
1639 * For the other two cases, we compute the target sleep time
1640 * into slp.
1641 */
1642 if (t == 0) {
1643 if (qp->c_cc < m)
1644 goto sleep;
1645 if (qp->c_cc > 0)
1646 goto read;
1647
1648 /* m, t and qp->c_cc are all 0. 0 is enough input. */
e43a034f 1649 crit_exit();
984263bc
MD
1650 return (0);
1651 }
1652 t *= 100000; /* time in us */
1653#define diff(t1, t2) (((t1).tv_sec - (t2).tv_sec) * 1000000 + \
1654 ((t1).tv_usec - (t2).tv_usec))
1655 if (m > 0) {
1656 if (qp->c_cc <= 0)
1657 goto sleep;
1658 if (qp->c_cc >= m)
1659 goto read;
1660 getmicrotime(&timecopy);
1661 if (!has_stime) {
1662 /* first character, start timer */
1663 has_stime = 1;
1664 stime = timecopy;
1665 slp = t;
1666 } else if (qp->c_cc > last_cc) {
1667 /* got a character, restart timer */
1668 stime = timecopy;
1669 slp = t;
1670 } else {
1671 /* nothing, check expiration */
1672 slp = t - diff(timecopy, stime);
1673 if (slp <= 0)
1674 goto read;
1675 }
1676 last_cc = qp->c_cc;
1677 } else { /* m == 0 */
1678 if (qp->c_cc > 0)
1679 goto read;
1680 getmicrotime(&timecopy);
1681 if (!has_stime) {
1682 has_stime = 1;
1683 stime = timecopy;
1684 slp = t;
1685 } else {
1686 slp = t - diff(timecopy, stime);
1687 if (slp <= 0) {
1688 /* Timed out, but 0 is enough input. */
e43a034f 1689 crit_exit();
984263bc
MD
1690 return (0);
1691 }
1692 }
1693 }
1694#undef diff
1695 /*
1696 * Rounding down may make us wake up just short
1697 * of the target, so we round up.
1698 * The formula is ceiling(slp * hz/1000000).
1699 * 32-bit arithmetic is enough for hz < 169.
1700 * XXX see tvtohz() for how to avoid overflow if hz
1701 * is large (divide by `tick' and/or arrange to
1702 * use tvtohz() if hz is large).
1703 */
1704 slp = (long) (((u_long)slp * hz) + 999999) / 1000000;
1705 goto sleep;
1706 }
1707 if (qp->c_cc <= 0) {
1708sleep:
1709 /*
1710 * There is no input, or not enough input and we can block.
1711 */
377d4740 1712 error = ttysleep(tp, TSA_HUP_OR_INPUT(tp), PCATCH,
984263bc
MD
1713 ISSET(tp->t_state, TS_CONNECTED) ?
1714 "ttyin" : "ttyhup", (int)slp);
e43a034f 1715 crit_exit();
984263bc
MD
1716 if (error == EWOULDBLOCK)
1717 error = 0;
1718 else if (error)
1719 return (error);
1720 /*
1721 * XXX what happens if another process eats some input
1722 * while we are asleep (not just here)? It would be
1723 * safest to detect changes and reset our state variables
1724 * (has_stime and last_cc).
1725 */
1726 slp = 0;
1727 goto loop;
1728 }
1729read:
e43a034f 1730 crit_exit();
984263bc
MD
1731 /*
1732 * Input present, check for input mapping and processing.
1733 */
1734 first = 1;
1735 if (ISSET(lflag, ICANON | ISIG))
1736 goto slowcase;
1737 for (;;) {
1738 char ibuf[IBUFSIZ];
1739 int icc;
1740
1741 icc = imin(uio->uio_resid, IBUFSIZ);
1742 icc = q_to_b(qp, ibuf, icc);
1743 if (icc <= 0) {
1744 if (first)
1745 goto loop;
1746 break;
1747 }
1748 error = uiomove(ibuf, icc, uio);
1749 /*
1750 * XXX if there was an error then we should ungetc() the
1751 * unmoved chars and reduce icc here.
1752 */
1753 if (error)
1754 break;
1755 if (uio->uio_resid == 0)
1756 break;
1757 first = 0;
1758 }
1759 goto out;
1760slowcase:
1761 for (;;) {
0ced1954 1762 c = clist_getc(qp);
984263bc
MD
1763 if (c < 0) {
1764 if (first)
1765 goto loop;
1766 break;
1767 }
1768 /*
1769 * delayed suspend (^Y)
1770 */
1771 if (CCEQ(cc[VDSUSP], c) &&
1772 ISSET(lflag, IEXTEN | ISIG) == (IEXTEN | ISIG)) {
1773 pgsignal(tp->t_pgrp, SIGTSTP, 1);
1774 if (first) {
377d4740 1775 error = ttysleep(tp, &lbolt, PCATCH,
984263bc
MD
1776 "ttybg3", 0);
1777 if (error)
1778 break;
1779 goto loop;
1780 }
1781 break;
1782 }
1783 /*
1784 * Interpret EOF only in canonical mode.
1785 */
1786 if (CCEQ(cc[VEOF], c) && ISSET(lflag, ICANON))
1787 break;
1788 /*
1789 * Give user character.
1790 */
1791 error = ureadc(c, uio);
1792 if (error)
1793 /* XXX should ungetc(c, qp). */
1794 break;
1795 if (uio->uio_resid == 0)
1796 break;
1797 /*
1798 * In canonical mode check for a "break character"
1799 * marking the end of a "line of input".
1800 */
1801 if (ISSET(lflag, ICANON) && TTBREAKC(c, lflag))
1802 break;
1803 first = 0;
1804 }
1805
1806out:
1807 /*
1808 * Look to unblock input now that (presumably)
1809 * the input queue has gone down.
1810 */
e43a034f 1811 crit_enter();
984263bc
MD
1812 if (ISSET(tp->t_state, TS_TBLOCK) &&
1813 tp->t_rawq.c_cc + tp->t_canq.c_cc <= tp->t_ilowat)
1814 ttyunblock(tp);
e43a034f 1815 crit_exit();
984263bc
MD
1816
1817 return (error);
1818}
1819
1820/*
1821 * Check the output queue on tp for space for a kernel message (from uprintf
1822 * or tprintf). Allow some space over the normal hiwater mark so we don't
1823 * lose messages due to normal flow control, but don't let the tty run amok.
1824 * Sleeps here are not interruptible, but we return prematurely if new signals
1825 * arrive.
1826 */
1827int
1828ttycheckoutq(tp, wait)
1fd87d54 1829 struct tty *tp;
984263bc
MD
1830 int wait;
1831{
e43a034f 1832 int hiwat;
984263bc
MD
1833 sigset_t oldmask;
1834
1835 hiwat = tp->t_ohiwat;
1836 SIGEMPTYSET(oldmask);
e43a034f 1837 crit_enter();
984263bc
MD
1838 if (wait)
1839 oldmask = curproc->p_siglist;
e43a034f 1840 if (tp->t_outq.c_cc > hiwat + OBUFSIZ + 100) {
984263bc
MD
1841 while (tp->t_outq.c_cc > hiwat) {
1842 ttstart(tp);
1843 if (tp->t_outq.c_cc <= hiwat)
1844 break;
1845 if (!(wait && SIGSETEQ(curproc->p_siglist, oldmask))) {
e43a034f 1846 crit_exit();
984263bc
MD
1847 return (0);
1848 }
1849 SET(tp->t_state, TS_SO_OLOWAT);
377d4740 1850 tsleep(TSA_OLOWAT(tp), 0, "ttoutq", hz);
984263bc 1851 }
e43a034f
MD
1852 }
1853 crit_exit();
984263bc
MD
1854 return (1);
1855}
1856
1857/*
1858 * Process a write call on a tty device.
1859 */
1860int
1861ttwrite(tp, uio, flag)
1fd87d54
RG
1862 struct tty *tp;
1863 struct uio *uio;
984263bc
MD
1864 int flag;
1865{
1fd87d54
RG
1866 char *cp = NULL;
1867 int cc, ce;
142dd704 1868 struct proc *pp;
e43a034f 1869 int i, hiwat, cnt, error;
984263bc
MD
1870 char obuf[OBUFSIZ];
1871
1872 hiwat = tp->t_ohiwat;
1873 cnt = uio->uio_resid;
1874 error = 0;
1875 cc = 0;
1876loop:
e43a034f 1877 crit_enter();
984263bc 1878 if (ISSET(tp->t_state, TS_ZOMBIE)) {
e43a034f 1879 crit_exit();
984263bc
MD
1880 if (uio->uio_resid == cnt)
1881 error = EIO;
1882 goto out;
1883 }
1884 if (!ISSET(tp->t_state, TS_CONNECTED)) {
1885 if (flag & IO_NDELAY) {
e43a034f 1886 crit_exit();
984263bc
MD
1887 error = EWOULDBLOCK;
1888 goto out;
1889 }
377d4740 1890 error = ttysleep(tp, TSA_CARR_ON(tp), PCATCH, "ttydcd", 0);
e43a034f 1891 crit_exit();
984263bc
MD
1892 if (error)
1893 goto out;
1894 goto loop;
1895 }
e43a034f 1896 crit_exit();
142dd704 1897
984263bc
MD
1898 /*
1899 * Hang the process if it's in the background.
1900 */
142dd704
MD
1901 if ((pp = curproc) && isbackground(pp, tp) &&
1902 ISSET(tp->t_lflag, TOSTOP) && !(pp->p_flag & P_PPWAIT) &&
1903 !SIGISMEMBER(pp->p_sigignore, SIGTTOU) &&
1904 !SIGISMEMBER(pp->p_sigmask, SIGTTOU)) {
1905 if (pp->p_pgrp->pg_jobc == 0) {
984263bc
MD
1906 error = EIO;
1907 goto out;
1908 }
142dd704 1909 pgsignal(pp->p_pgrp, SIGTTOU, 1);
377d4740 1910 error = ttysleep(tp, &lbolt, PCATCH, "ttybg4", 0);
984263bc
MD
1911 if (error)
1912 goto out;
1913 goto loop;
1914 }
1915 /*
1916 * Process the user's data in at most OBUFSIZ chunks. Perform any
1917 * output translation. Keep track of high water mark, sleep on
1918 * overflow awaiting device aid in acquiring new space.
1919 */
1920 while (uio->uio_resid > 0 || cc > 0) {
1921 if (ISSET(tp->t_lflag, FLUSHO)) {
1922 uio->uio_resid = 0;
1923 return (0);
1924 }
1925 if (tp->t_outq.c_cc > hiwat)
1926 goto ovhiwat;
1927 /*
1928 * Grab a hunk of data from the user, unless we have some
1929 * leftover from last time.
1930 */
1931 if (cc == 0) {
1932 cc = imin(uio->uio_resid, OBUFSIZ);
1933 cp = obuf;
1934 error = uiomove(cp, cc, uio);
1935 if (error) {
1936 cc = 0;
1937 break;
1938 }
1939 }
1940 /*
1941 * If nothing fancy need be done, grab those characters we
1942 * can handle without any of ttyoutput's processing and
1943 * just transfer them to the output q. For those chars
1944 * which require special processing (as indicated by the
1945 * bits in char_type), call ttyoutput. After processing
1946 * a hunk of data, look for FLUSHO so ^O's will take effect
1947 * immediately.
1948 */
1949 while (cc > 0) {
1950 if (!ISSET(tp->t_oflag, OPOST))
1951 ce = cc;
1952 else {
1953 ce = cc - scanc((u_int)cc, (u_char *)cp,
1954 char_type, CCLASSMASK);
1955 /*
1956 * If ce is zero, then we're processing
1957 * a special character through ttyoutput.
1958 */
1959 if (ce == 0) {
1960 tp->t_rocount = 0;
1961 if (ttyoutput(*cp, tp) >= 0) {
1962 /* No Clists, wait a bit. */
1963 ttstart(tp);
1964 if (flag & IO_NDELAY) {
1965 error = EWOULDBLOCK;
1966 goto out;
1967 }
1968 error = ttysleep(tp, &lbolt,
377d4740 1969 PCATCH,
984263bc
MD
1970 "ttybf1", 0);
1971 if (error)
1972 goto out;
1973 goto loop;
1974 }
1975 cp++;
1976 cc--;
1977 if (ISSET(tp->t_lflag, FLUSHO) ||
1978 tp->t_outq.c_cc > hiwat)
1979 goto ovhiwat;
1980 continue;
1981 }
1982 }
1983 /*
1984 * A bunch of normal characters have been found.
1985 * Transfer them en masse to the output queue and
1986 * continue processing at the top of the loop.
1987 * If there are any further characters in this
1988 * <= OBUFSIZ chunk, the first should be a character
1989 * requiring special handling by ttyoutput.
1990 */
1991 tp->t_rocount = 0;
1992 i = b_to_q(cp, ce, &tp->t_outq);
1993 ce -= i;
1994 tp->t_column += ce;
1995 cp += ce, cc -= ce, tk_nout += ce;
1996 tp->t_outcc += ce;
1997 if (i > 0) {
1998 /* No Clists, wait a bit. */
1999 ttstart(tp);
2000 if (flag & IO_NDELAY) {
2001 error = EWOULDBLOCK;
2002 goto out;
2003 }
377d4740 2004 error = ttysleep(tp, &lbolt, PCATCH,
984263bc
MD
2005 "ttybf2", 0);
2006 if (error)
2007 goto out;
2008 goto loop;
2009 }
2010 if (ISSET(tp->t_lflag, FLUSHO) ||
2011 tp->t_outq.c_cc > hiwat)
2012 break;
2013 }
2014 ttstart(tp);
2015 }
2016out:
2017 /*
2018 * If cc is nonzero, we leave the uio structure inconsistent, as the
2019 * offset and iov pointers have moved forward, but it doesn't matter
2020 * (the call will either return short or restart with a new uio).
2021 */
2022 uio->uio_resid += cc;
2023 return (error);
2024
2025ovhiwat:
2026 ttstart(tp);
e43a034f 2027 crit_enter();
984263bc
MD
2028 /*
2029 * This can only occur if FLUSHO is set in t_lflag,
2030 * or if ttstart/oproc is synchronous (or very fast).
2031 */
2032 if (tp->t_outq.c_cc <= hiwat) {
e43a034f 2033 crit_exit();
984263bc
MD
2034 goto loop;
2035 }
2036 if (flag & IO_NDELAY) {
e43a034f 2037 crit_exit();
984263bc
MD
2038 uio->uio_resid += cc;
2039 return (uio->uio_resid == cnt ? EWOULDBLOCK : 0);
2040 }
2041 SET(tp->t_state, TS_SO_OLOWAT);
377d4740 2042 error = ttysleep(tp, TSA_OLOWAT(tp), PCATCH, "ttywri", tp->t_timeout);
e43a034f 2043 crit_exit();
984263bc
MD
2044 if (error == EWOULDBLOCK)
2045 error = EIO;
2046 if (error)
2047 goto out;
2048 goto loop;
2049}
2050
2051/*
2052 * Rubout one character from the rawq of tp
2053 * as cleanly as possible.
2054 */
2055static void
2056ttyrub(c, tp)
1fd87d54
RG
2057 int c;
2058 struct tty *tp;
984263bc 2059{
1fd87d54
RG
2060 char *cp;
2061 int savecol;
e43a034f 2062 int tabc;
984263bc
MD
2063
2064 if (!ISSET(tp->t_lflag, ECHO) || ISSET(tp->t_lflag, EXTPROC))
2065 return;
2066 CLR(tp->t_lflag, FLUSHO);
2067 if (ISSET(tp->t_lflag, ECHOE)) {
2068 if (tp->t_rocount == 0) {
2069 /*
2070 * Screwed by ttwrite; retype
2071 */
2072 ttyretype(tp);
2073 return;
2074 }
2075 if (c == ('\t' | TTY_QUOTE) || c == ('\n' | TTY_QUOTE))
2076 ttyrubo(tp, 2);
2077 else {
2078 CLR(c, ~TTY_CHARMASK);
2079 switch (CCLASS(c)) {
2080 case ORDINARY:
2081 ttyrubo(tp, 1);
2082 break;
2083 case BACKSPACE:
2084 case CONTROL:
2085 case NEWLINE:
2086 case RETURN:
2087 case VTAB:
2088 if (ISSET(tp->t_lflag, ECHOCTL))
2089 ttyrubo(tp, 2);
2090 break;
2091 case TAB:
2092 if (tp->t_rocount < tp->t_rawq.c_cc) {
2093 ttyretype(tp);
2094 return;
2095 }
e43a034f 2096 crit_enter();
984263bc
MD
2097 savecol = tp->t_column;
2098 SET(tp->t_state, TS_CNTTB);
2099 SET(tp->t_lflag, FLUSHO);
2100 tp->t_column = tp->t_rocol;
2101 cp = tp->t_rawq.c_cf;
2102 if (cp)
2103 tabc = *cp; /* XXX FIX NEXTC */
2104 for (; cp; cp = nextc(&tp->t_rawq, cp, &tabc))
2105 ttyecho(tabc, tp);
2106 CLR(tp->t_lflag, FLUSHO);
2107 CLR(tp->t_state, TS_CNTTB);
e43a034f 2108 crit_exit();
984263bc
MD
2109
2110 /* savecol will now be length of the tab. */
2111 savecol -= tp->t_column;
2112 tp->t_column += savecol;
2113 if (savecol > 8)
2114 savecol = 8; /* overflow screw */
2115 while (--savecol >= 0)
2116 (void)ttyoutput('\b', tp);
2117 break;
2118 default: /* XXX */
2119#define PANICSTR "ttyrub: would panic c = %d, val = %d\n"
2120 (void)printf(PANICSTR, c, CCLASS(c));
2121#ifdef notdef
2122 panic(PANICSTR, c, CCLASS(c));
2123#endif
2124 }
2125 }
2126 } else if (ISSET(tp->t_lflag, ECHOPRT)) {
2127 if (!ISSET(tp->t_state, TS_ERASE)) {
2128 SET(tp->t_state, TS_ERASE);
2129 (void)ttyoutput('\\', tp);
2130 }
2131 ttyecho(c, tp);
2132 } else {
2133 ttyecho(tp->t_cc[VERASE], tp);
2134 /*
2135 * This code may be executed not only when an ERASE key
2136 * is pressed, but also when ^U (KILL) or ^W (WERASE) are.
2137 * So, I didn't think it was worthwhile to pass the extra
2138 * information (which would need an extra parameter,
2139 * changing every call) needed to distinguish the ERASE2
2140 * case from the ERASE.
2141 */
2142 }
2143 --tp->t_rocount;
2144}
2145
2146/*
2147 * Back over cnt characters, erasing them.
2148 */
2149static void
2150ttyrubo(tp, cnt)
1fd87d54 2151 struct tty *tp;
984263bc
MD
2152 int cnt;
2153{
2154
2155 while (cnt-- > 0) {
2156 (void)ttyoutput('\b', tp);
2157 (void)ttyoutput(' ', tp);
2158 (void)ttyoutput('\b', tp);
2159 }
2160}
2161
2162/*
2163 * ttyretype --
2164 * Reprint the rawq line. Note, it is assumed that c_cc has already
2165 * been checked.
2166 */
2167static void
2168ttyretype(tp)
1fd87d54 2169 struct tty *tp;
984263bc 2170{
1fd87d54 2171 char *cp;
e43a034f 2172 int c;
984263bc
MD
2173
2174 /* Echo the reprint character. */
2175 if (tp->t_cc[VREPRINT] != _POSIX_VDISABLE)
2176 ttyecho(tp->t_cc[VREPRINT], tp);
2177
2178 (void)ttyoutput('\n', tp);
2179
2180 /*
2181 * XXX
2182 * FIX: NEXTC IS BROKEN - DOESN'T CHECK QUOTE
2183 * BIT OF FIRST CHAR.
2184 */
e43a034f 2185 crit_enter();
984263bc
MD
2186 for (cp = tp->t_canq.c_cf, c = (cp != NULL ? *cp : 0);
2187 cp != NULL; cp = nextc(&tp->t_canq, cp, &c))
2188 ttyecho(c, tp);
2189 for (cp = tp->t_rawq.c_cf, c = (cp != NULL ? *cp : 0);
2190 cp != NULL; cp = nextc(&tp->t_rawq, cp, &c))
2191 ttyecho(c, tp);
2192 CLR(tp->t_state, TS_ERASE);
e43a034f 2193 crit_exit();
984263bc
MD
2194
2195 tp->t_rocount = tp->t_rawq.c_cc;
2196 tp->t_rocol = 0;
2197}
2198
2199/*
2200 * Echo a typed character to the terminal.
2201 */
2202static void
2203ttyecho(c, tp)
1fd87d54
RG
2204 int c;
2205 struct tty *tp;
984263bc
MD
2206{
2207
2208 if (!ISSET(tp->t_state, TS_CNTTB))
2209 CLR(tp->t_lflag, FLUSHO);
2210 if ((!ISSET(tp->t_lflag, ECHO) &&
2211 (c != '\n' || !ISSET(tp->t_lflag, ECHONL))) ||
2212 ISSET(tp->t_lflag, EXTPROC))
2213 return;
2214 if (ISSET(tp->t_lflag, ECHOCTL) &&
2215 ((ISSET(c, TTY_CHARMASK) <= 037 && c != '\t' && c != '\n') ||
2216 ISSET(c, TTY_CHARMASK) == 0177)) {
2217 (void)ttyoutput('^', tp);
2218 CLR(c, ~TTY_CHARMASK);
2219 if (c == 0177)
2220 c = '?';
2221 else
2222 c += 'A' - 1;
2223 }
2224 (void)ttyoutput(c, tp);
2225}
2226
2227/*
2228 * Wake up any readers on a tty.
2229 */
2230void
2231ttwakeup(tp)
1fd87d54 2232 struct tty *tp;
984263bc
MD
2233{
2234
2235 if (tp->t_rsel.si_pid != 0)
2236 selwakeup(&tp->t_rsel);
2237 if (ISSET(tp->t_state, TS_ASYNC) && tp->t_sigio != NULL)
2238 pgsigio(tp->t_sigio, SIGIO, (tp->t_session != NULL));
2239 wakeup(TSA_HUP_OR_INPUT(tp));
2240 KNOTE(&tp->t_rsel.si_note, 0);
2241}
2242
2243/*
2244 * Wake up any writers on a tty.
2245 */
2246void
2247ttwwakeup(tp)
1fd87d54 2248 struct tty *tp;
984263bc
MD
2249{
2250
2251 if (tp->t_wsel.si_pid != 0 && tp->t_outq.c_cc <= tp->t_olowat)
2252 selwakeup(&tp->t_wsel);
2253 if (ISSET(tp->t_state, TS_ASYNC) && tp->t_sigio != NULL)
2254 pgsigio(tp->t_sigio, SIGIO, (tp->t_session != NULL));
2255 if (ISSET(tp->t_state, TS_BUSY | TS_SO_OCOMPLETE) ==
2256 TS_SO_OCOMPLETE && tp->t_outq.c_cc == 0) {
2257 CLR(tp->t_state, TS_SO_OCOMPLETE);
2258 wakeup(TSA_OCOMPLETE(tp));
2259 }
2260 if (ISSET(tp->t_state, TS_SO_OLOWAT) &&
2261 tp->t_outq.c_cc <= tp->t_olowat) {
2262 CLR(tp->t_state, TS_SO_OLOWAT);
2263 wakeup(TSA_OLOWAT(tp));
2264 }
2265 KNOTE(&tp->t_wsel.si_note, 0);
2266}
2267
2268/*
2269 * Look up a code for a specified speed in a conversion table;
2270 * used by drivers to map software speed values to hardware parameters.
2271 */
2272int
2273ttspeedtab(speed, table)
2274 int speed;
1fd87d54 2275 struct speedtab *table;
984263bc
MD
2276{
2277
2278 for ( ; table->sp_speed != -1; table++)
2279 if (table->sp_speed == speed)
2280 return (table->sp_code);
2281 return (-1);
2282}
2283
2284/*
2285 * Set input and output watermarks and buffer sizes. For input, the
2286 * high watermark is about one second's worth of input above empty, the
2287 * low watermark is slightly below high water, and the buffer size is a
2288 * driver-dependent amount above high water. For output, the watermarks
2289 * are near the ends of the buffer, with about 1 second's worth of input
2290 * between them. All this only applies to the standard line discipline.
2291 */
2292void
2293ttsetwater(tp)
2294 struct tty *tp;
2295{
1fd87d54 2296 int cps, ttmaxhiwat, x;
984263bc
MD
2297
2298 /* Input. */
2299 clist_alloc_cblocks(&tp->t_canq, TTYHOG, 512);
2300 switch (tp->t_ispeedwat) {
2301 case (speed_t)-1:
2302 cps = tp->t_ispeed / 10;
2303 break;
2304 case 0:
2305 /*
2306 * This case is for old drivers that don't know about
2307 * t_ispeedwat. Arrange for them to get the old buffer
2308 * sizes and watermarks.
2309 */
2310 cps = TTYHOG - 2 * 256;
2311 tp->t_ififosize = 2 * 256;
2312 break;
2313 default:
2314 cps = tp->t_ispeedwat / 10;
2315 break;
2316 }
2317 tp->t_ihiwat = cps;
2318 tp->t_ilowat = 7 * cps / 8;
2319 x = cps + tp->t_ififosize;
2320 clist_alloc_cblocks(&tp->t_rawq, x, x);
2321
2322 /* Output. */
2323 switch (tp->t_ospeedwat) {
2324 case (speed_t)-1:
2325 cps = tp->t_ospeed / 10;
2326 ttmaxhiwat = 2 * TTMAXHIWAT;
2327 break;
2328 case 0:
2329 cps = tp->t_ospeed / 10;
2330 ttmaxhiwat = TTMAXHIWAT;
2331 break;
2332 default:
2333 cps = tp->t_ospeedwat / 10;
2334 ttmaxhiwat = 8 * TTMAXHIWAT;
2335 break;
2336 }
2337#define CLAMP(x, h, l) ((x) > h ? h : ((x) < l) ? l : (x))
2338 tp->t_olowat = x = CLAMP(cps / 2, TTMAXLOWAT, TTMINLOWAT);
2339 x += cps;
2340 x = CLAMP(x, ttmaxhiwat, TTMINHIWAT); /* XXX clamps are too magic */
2341 tp->t_ohiwat = roundup(x, CBSIZE); /* XXX for compat */
2342 x = imax(tp->t_ohiwat, TTMAXHIWAT); /* XXX for compat/safety */
2343 x += OBUFSIZ + 100;
2344 clist_alloc_cblocks(&tp->t_outq, x, x);
2345#undef CLAMP
2346}
2347
2348/*
2349 * Report on state of foreground process group.
2350 */
2351void
2352ttyinfo(tp)
1fd87d54 2353 struct tty *tp;
984263bc 2354{
1fd87d54 2355 struct proc *p, *pick;
984263bc
MD
2356 struct timeval utime, stime;
2357 int tmp;
2358
2359 if (ttycheckoutq(tp,0) == 0)
2360 return;
2361
5daa25b0
MD
2362 /*
2363 * We always print the load average, then figure out what else to
2364 * print based on the state of the current process group.
2365 */
984263bc
MD
2366 tmp = (averunnable.ldavg[0] * 100 + FSCALE / 2) >> FSHIFT;
2367 ttyprintf(tp, "load: %d.%02d ", tmp / 100, tmp % 100);
2368
5daa25b0 2369 if (tp->t_session == NULL) {
984263bc 2370 ttyprintf(tp, "not a controlling terminal\n");
5daa25b0 2371 } else if (tp->t_pgrp == NULL) {
984263bc 2372 ttyprintf(tp, "no foreground process group\n");
5daa25b0 2373 } else if ((p = LIST_FIRST(&tp->t_pgrp->pg_members)) == 0) {
984263bc 2374 ttyprintf(tp, "empty foreground process group\n");
5daa25b0 2375 } else {
8dda877a 2376 /*
5daa25b0
MD
2377 * Pick an interesting process. Note that certain elements,
2378 * in particular the wmesg, require a critical section for
2379 * safe access (YYY and we are still not MP safe).
8dda877a 2380 *
5daa25b0
MD
2381 * NOTE: p_wmesg is p_thread->td_wmesg, and p_comm is
2382 * p_thread->td_comm.
8dda877a 2383 */
5daa25b0 2384 char buf[64];
8dda877a 2385 const char *str;
5daa25b0
MD
2386 int isinmem;
2387 long vmsz;
2388 int pctcpu;
8dda877a
MD
2389
2390 crit_enter();
5daa25b0 2391
8dda877a 2392 for (pick = NULL; p != 0; p = LIST_NEXT(p, p_pglist)) {
984263bc
MD
2393 if (proc_compare(pick, p))
2394 pick = p;
8dda877a 2395 }
5daa25b0
MD
2396
2397 /*
2398 * Figure out what wait/process-state message, and command
2399 * buffer to present
2400 */
8dda877a
MD
2401 if (pick->p_thread == NULL)
2402 str = "exiting";
2403 else if (pick->p_stat == SRUN)
2404 str = "running";
2405 else if (pick->p_wmesg) /* p_thread must not be NULL */
2406 str = pick->p_wmesg;
2407 else
2408 str = "iowait";
984263bc 2409
5daa25b0
MD
2410 snprintf(buf, sizeof(buf), "cmd: %s %d [%s]",
2411 (pick->p_thread ? pick->p_comm : "?"),
2412 pick->p_pid, str);
984263bc 2413
5daa25b0
MD
2414 /*
2415 * Calculate cpu usage, percent cpu, and cmsz. Note that
2416 * 'pick' becomes invalid the moment we exit the critical
2417 * section.
2418 */
344ad853 2419 if (pick->p_thread && (pick->p_flag & P_SWAPPEDOUT) == 0) {
984263bc 2420 calcru(pick, &utime, &stime, NULL);
5daa25b0
MD
2421 isinmem = 1;
2422 } else {
2423 isinmem = 0;
2424 }
984263bc 2425
5daa25b0
MD
2426 pctcpu = (pick->p_pctcpu * 10000 + FSCALE / 2) >> FSHIFT;
2427
f026f3b0 2428 if (pick->p_stat == SIDL || (pick->p_flag & P_ZOMBIE))
5daa25b0
MD
2429 vmsz = 0;
2430 else
2431 vmsz = pgtok(vmspace_resident_count(pick->p_vmspace));
2432
2433 crit_exit();
984263bc 2434
5daa25b0
MD
2435 /*
2436 * Dump the output
2437 */
2438 ttyprintf(tp, " %s ", buf);
2439 if (isinmem) {
2440 ttyprintf(tp, "%ld.%02ldu ",
2441 utime.tv_sec, utime.tv_usec / 10000);
984263bc 2442 ttyprintf(tp, "%ld.%02lds ",
5daa25b0 2443 stime.tv_sec, stime.tv_usec / 10000);
8dda877a 2444 } else {
984263bc 2445 ttyprintf(tp, "?.??u ?.??s ");
8dda877a 2446 }
5daa25b0 2447 ttyprintf(tp, "%d%% %ldk\n", pctcpu / 100, vmsz);
984263bc
MD
2448 }
2449 tp->t_rocount = 0; /* so pending input will be retyped if BS */
2450}
2451
2452/*
2453 * Returns 1 if p2 is "better" than p1
2454 *
2455 * The algorithm for picking the "interesting" process is thus:
2456 *
2457 * 1) Only foreground processes are eligible - implied.
2458 * 2) Runnable processes are favored over anything else. The runner
dcc99b62 2459 * with the highest cpu utilization is picked (p_cpticks). Ties are
984263bc
MD
2460 * broken by picking the highest pid.
2461 * 3) The sleeper with the shortest sleep time is next. With ties,
2462 * we pick out just "short-term" sleepers (P_SINTR == 0).
2463 * 4) Further ties are broken by picking the highest pid.
2464 */
2465#define ISRUN(p) (((p)->p_stat == SRUN) || ((p)->p_stat == SIDL))
2466#define TESTAB(a, b) ((a)<<1 | (b))
2467#define ONLYA 2
2468#define ONLYB 1
2469#define BOTH 3
2470
2471static int
2472proc_compare(p1, p2)
1fd87d54 2473 struct proc *p1, *p2;
984263bc
MD
2474{
2475
2476 if (p1 == NULL)
2477 return (1);
2478 /*
2479 * see if at least one of them is runnable
2480 */
2481 switch (TESTAB(ISRUN(p1), ISRUN(p2))) {
2482 case ONLYA:
2483 return (0);
2484 case ONLYB:
2485 return (1);
2486 case BOTH:
2487 /*
2488 * tie - favor one with highest recent cpu utilization
2489 */
dcc99b62 2490 if (p2->p_cpticks > p1->p_cpticks)
984263bc 2491 return (1);
dcc99b62 2492 if (p1->p_cpticks > p2->p_cpticks)
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MD
2493 return (0);
2494 return (p2->p_pid > p1->p_pid); /* tie - return highest pid */
2495 }
2496 /*
2497 * weed out zombies
2498 */
f026f3b0 2499 switch (TESTAB((p1->p_flag & P_ZOMBIE), (p2->p_flag & P_ZOMBIE))) {
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MD
2500 case ONLYA:
2501 return (1);
2502 case ONLYB:
2503 return (0);
2504 case BOTH:
2505 return (p2->p_pid > p1->p_pid); /* tie - return highest pid */
2506 }
2507 /*
2508 * pick the one with the smallest sleep time
2509 */
2510 if (p2->p_slptime > p1->p_slptime)
2511 return (0);
2512 if (p1->p_slptime > p2->p_slptime)
2513 return (1);
2514 /*
2515 * favor one sleeping in a non-interruptible sleep
2516 */
2517 if (p1->p_flag & P_SINTR && (p2->p_flag & P_SINTR) == 0)
2518 return (1);
2519 if (p2->p_flag & P_SINTR && (p1->p_flag & P_SINTR) == 0)
2520 return (0);
2521 return (p2->p_pid > p1->p_pid); /* tie - return highest pid */
2522}
2523
2524/*
2525 * Output char to tty; console putchar style.
2526 */
2527int
2528tputchar(c, tp)
2529 int c;
2530 struct tty *tp;
2531{
e43a034f 2532 crit_enter();
984263bc 2533 if (!ISSET(tp->t_state, TS_CONNECTED)) {
e43a034f 2534 crit_exit();
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MD
2535 return (-1);
2536 }
2537 if (c == '\n')
2538 (void)ttyoutput('\r', tp);
2539 (void)ttyoutput(c, tp);
2540 ttstart(tp);
e43a034f 2541 crit_exit();
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MD
2542 return (0);
2543}
2544
2545/*
2546 * Sleep on chan, returning ERESTART if tty changed while we napped and
2547 * returning any errors (e.g. EINTR/EWOULDBLOCK) reported by tsleep. If
2548 * the tty is revoked, restarting a pending call will redo validation done
2549 * at the start of the call.
2550 */
2551int
377d4740 2552ttysleep(tp, chan, slpflags, wmesg, timo)
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MD
2553 struct tty *tp;
2554 void *chan;
377d4740 2555 int slpflags, timo;
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MD
2556 char *wmesg;
2557{
2558 int error;
2559 int gen;
2560
2561 gen = tp->t_gen;
377d4740 2562 error = tsleep(chan, slpflags, wmesg, timo);
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2563 if (error)
2564 return (error);
2565 return (tp->t_gen == gen ? 0 : ERESTART);
2566}
2567
2568/*
2569 * Allocate a tty struct. Clists in the struct will be allocated by
2570 * ttyopen().
2571 */
2572struct tty *
2573ttymalloc(tp)
2574 struct tty *tp;
2575{
2576
2577 if (tp)
2578 return(tp);
efda3bd0 2579 tp = kmalloc(sizeof *tp, M_TTYS, M_WAITOK|M_ZERO);
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MD
2580 ttyregister(tp);
2581 return (tp);
2582}
2583
8b90699b 2584#if 0
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MD
2585/*
2586 * Free a tty struct. Clists in the struct should have been freed by
2587 * ttyclose().
8b90699b
MD
2588 *
2589 * XXX not yet usable: since we support a half-closed state and do not
2590 * ref count the tty reference from the session, it is possible for a
2591 * session to hold a ref on the tty. See TTY_DO_FULL_CLOSE.
984263bc
MD
2592 */
2593void
2594ttyfree(tp)
2595 struct tty *tp;
2596{
efda3bd0 2597 kfree(tp, M_TTYS);
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MD
2598}
2599#endif /* 0 */
2600
2601void
2602ttyregister(tp)
2603 struct tty *tp;
2604{
2605 SLIST_INSERT_HEAD(&tty_list, tp, t_list);
2606}
2607
2608static int
2609sysctl_kern_ttys(SYSCTL_HANDLER_ARGS)
2610{
2611 int error;
2612 struct tty *tp, t;
2613 SLIST_FOREACH(tp, &tty_list, t_list) {
2614 t = *tp;
2615 if (t.t_dev)
b13267a5 2616 t.t_dev = (cdev_t)dev2udev(t.t_dev);
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MD
2617 error = SYSCTL_OUT(req, (caddr_t)&t, sizeof(t));
2618 if (error)
2619 return (error);
2620 }
2621 return (0);
2622}
2623
2624SYSCTL_PROC(_kern, OID_AUTO, ttys, CTLTYPE_OPAQUE|CTLFLAG_RD,
2625 0, 0, sysctl_kern_ttys, "S,tty", "All struct ttys");
2626
2627void
2628nottystop(tp, rw)
2629 struct tty *tp;
2630 int rw;
2631{
2632
2633 return;
2634}
2635
2636int
fef8985e 2637ttyread(struct dev_read_args *ap)
984263bc
MD
2638{
2639 struct tty *tp;
2640
fef8985e 2641 tp = ap->a_head.a_dev->si_tty;
984263bc
MD
2642 if (tp == NULL)
2643 return (ENODEV);
fef8985e 2644 return ((*linesw[tp->t_line].l_read)(tp, ap->a_uio, ap->a_ioflag));
984263bc
MD
2645}
2646
2647int
fef8985e 2648ttywrite(struct dev_write_args *ap)
984263bc
MD
2649{
2650 struct tty *tp;
2651
fef8985e 2652 tp = ap->a_head.a_dev->si_tty;
984263bc
MD
2653 if (tp == NULL)
2654 return (ENODEV);
fef8985e 2655 return ((*linesw[tp->t_line].l_write)(tp, ap->a_uio, ap->a_ioflag));
984263bc 2656}