kernel - Fix pty registration, memory leak
[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 $
62c46e45 40 * $DragonFly: src/sys/kern/tty.c,v 1.46 2008/09/10 09:50:09 y0netan1 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>
895c1f85 81#include <sys/priv.h>
984263bc
MD
82#define TTYDEFCHARS
83#include <sys/tty.h>
a38e57d5 84#include <sys/clist.h>
984263bc
MD
85#undef TTYDEFCHARS
86#include <sys/fcntl.h>
87#include <sys/conf.h>
88#include <sys/dkstat.h>
984263bc
MD
89#include <sys/kernel.h>
90#include <sys/vnode.h>
91#include <sys/signalvar.h>
b1b4e5a6 92#include <sys/signal2.h>
984263bc
MD
93#include <sys/resourcevar.h>
94#include <sys/malloc.h>
95#include <sys/filedesc.h>
96#include <sys/sysctl.h>
8dda877a 97#include <sys/thread2.h>
984263bc
MD
98
99#include <vm/vm.h>
100#include <sys/lock.h>
101#include <vm/pmap.h>
102#include <vm/vm_map.h>
103
104MALLOC_DEFINE(M_TTYS, "ttys", "tty data structures");
105
402ed7e1
RG
106static int proc_compare (struct proc *p1, struct proc *p2);
107static int ttnread (struct tty *tp);
108static void ttyecho (int c, struct tty *tp);
109static int ttyoutput (int c, struct tty *tp);
110static void ttypend (struct tty *tp);
111static void ttyretype (struct tty *tp);
112static void ttyrub (int c, struct tty *tp);
113static void ttyrubo (struct tty *tp, int cnt);
114static void ttyunblock (struct tty *tp);
115static int ttywflush (struct tty *tp);
116static int filt_ttyread (struct knote *kn, long hint);
117static void filt_ttyrdetach (struct knote *kn);
118static int filt_ttywrite (struct knote *kn, long hint);
119static void filt_ttywdetach (struct knote *kn);
984263bc
MD
120
121/*
122 * Table with character classes and parity. The 8th bit indicates parity,
123 * the 7th bit indicates the character is an alphameric or underscore (for
124 * ALTWERASE), and the low 6 bits indicate delay type. If the low 6 bits
125 * are 0 then the character needs no special processing on output; classes
126 * other than 0 might be translated or (not currently) require delays.
127 */
128#define E 0x00 /* Even parity. */
129#define O 0x80 /* Odd parity. */
130#define PARITY(c) (char_type[c] & O)
131
132#define ALPHA 0x40 /* Alpha or underscore. */
133#define ISALPHA(c) (char_type[(c) & TTY_CHARMASK] & ALPHA)
134
135#define CCLASSMASK 0x3f
136#define CCLASS(c) (char_type[c] & CCLASSMASK)
137
138#define BS BACKSPACE
139#define CC CONTROL
140#define CR RETURN
141#define NA ORDINARY | ALPHA
142#define NL NEWLINE
143#define NO ORDINARY
144#define TB TAB
145#define VT VTAB
146
147static u_char const char_type[] = {
148 E|CC, O|CC, O|CC, E|CC, O|CC, E|CC, E|CC, O|CC, /* nul - bel */
149 O|BS, E|TB, E|NL, O|CC, E|VT, O|CR, O|CC, E|CC, /* bs - si */
150 O|CC, E|CC, E|CC, O|CC, E|CC, O|CC, O|CC, E|CC, /* dle - etb */
151 E|CC, O|CC, O|CC, E|CC, O|CC, E|CC, E|CC, O|CC, /* can - us */
152 O|NO, E|NO, E|NO, O|NO, E|NO, O|NO, O|NO, E|NO, /* sp - ' */
153 E|NO, O|NO, O|NO, E|NO, O|NO, E|NO, E|NO, O|NO, /* ( - / */
154 E|NA, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* 0 - 7 */
155 O|NA, E|NA, E|NO, O|NO, E|NO, O|NO, O|NO, E|NO, /* 8 - ? */
156 O|NO, E|NA, E|NA, O|NA, E|NA, O|NA, O|NA, E|NA, /* @ - G */
157 E|NA, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* H - O */
158 E|NA, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* P - W */
159 O|NA, E|NA, E|NA, O|NO, E|NO, O|NO, O|NO, O|NA, /* X - _ */
160 E|NO, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* ` - g */
161 O|NA, E|NA, E|NA, O|NA, E|NA, O|NA, O|NA, E|NA, /* h - o */
162 O|NA, E|NA, E|NA, O|NA, E|NA, O|NA, O|NA, E|NA, /* p - w */
163 E|NA, O|NA, O|NA, E|NO, O|NO, E|NO, E|NO, O|CC, /* x - del */
164 /*
165 * Meta chars; should be settable per character set;
166 * for now, treat them all as normal characters.
167 */
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 NA, NA, NA, NA, NA, NA, NA, NA,
184};
185#undef BS
186#undef CC
187#undef CR
188#undef NA
189#undef NL
190#undef NO
191#undef TB
192#undef VT
193
194/* Macros to clear/set/test flags. */
195#define SET(t, f) (t) |= (f)
196#define CLR(t, f) (t) &= ~(f)
197#define ISSET(t, f) ((t) & (f))
198
199#undef MAX_INPUT /* XXX wrong in <sys/syslimits.h> */
200#define MAX_INPUT TTYHOG /* XXX limit is usually larger for !ICANON */
201
f5d21610
JS
202uint64_t tk_nin;
203SYSCTL_OPAQUE(_kern, OID_AUTO, tk_nin, CTLFLAG_RD, &tk_nin, sizeof(tk_nin),
204 "LU", "TTY input statistic");
205uint64_t tk_nout;
206SYSCTL_OPAQUE(_kern, OID_AUTO, tk_nout, CTLFLAG_RD, &tk_nout, sizeof(tk_nout),
207 "LU", "TTY output statistic");
208uint64_t tk_rawcc;
209
984263bc
MD
210/*
211 * list of struct tty where pstat(8) can pick it up with sysctl
212 */
ddac2002 213static TAILQ_HEAD(, tty) tty_list = TAILQ_HEAD_INITIALIZER(tty_list);
984263bc
MD
214
215/*
216 * Initial open of tty, or (re)entry to standard tty line discipline.
217 */
218int
c972a82f 219ttyopen(cdev_t device, struct tty *tp)
984263bc 220{
e43a034f 221 crit_enter();
984263bc
MD
222 tp->t_dev = device;
223 if (!ISSET(tp->t_state, TS_ISOPEN)) {
224 SET(tp->t_state, TS_ISOPEN);
cd29885a 225 if (ISSET(tp->t_cflag, CLOCAL)) {
984263bc 226 SET(tp->t_state, TS_CONNECTED);
cd29885a 227 }
984263bc
MD
228 bzero(&tp->t_winsize, sizeof(tp->t_winsize));
229 }
230 ttsetwater(tp);
e43a034f 231 crit_exit();
984263bc
MD
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 *
984263bc
MD
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
c972a82f 245ttyclose(struct tty *tp)
984263bc 246{
984263bc 247 funsetown(tp->t_sigio);
e43a034f 248 crit_enter();
984263bc
MD
249 if (constty == tp)
250 constty = NULL;
251
252 ttyflush(tp, FREAD | FWRITE);
253 clist_free_cblocks(&tp->t_canq);
254 clist_free_cblocks(&tp->t_outq);
255 clist_free_cblocks(&tp->t_rawq);
256
257 tp->t_gen++;
258 tp->t_line = TTYDISC;
8b90699b 259 ttyclearsession(tp);
ddac2002 260 tp->t_state &= TS_REGISTERED; /* clear all bits except */
e43a034f 261 crit_exit();
984263bc
MD
262 return (0);
263}
264
8b90699b
MD
265/*
266 * Disassociate the tty from its session. Traditionally this has only been
267 * a half-close, meaning that the session was still allowed to point at the
268 * tty (resulting in the tty in the ps command showing something like 'p0-'),
269 * even though the tty is no longer pointing at the session.
270 *
271 * The half close seems to be useful only for 'ps' output but there is as
272 * yet no reason to remove the feature. The full-close code is currently
273 * #if 0'd out. See also sess_rele() in kern/kern_proc.c.
274 */
275void
276ttyclearsession(struct tty *tp)
277{
278 struct session *sp;
279
280 tp->t_pgrp = NULL;
281 if ((sp = tp->t_session) != NULL) {
282 tp->t_session = NULL;
283#ifdef TTY_DO_FULL_CLOSE
284 /* FULL CLOSE (not yet) */
285 if (sp->s_ttyp == tp) {
286 sp->s_ttyp = NULL;
287 } else {
6ea70f76 288 kprintf("ttyclearsession: warning: sp->s_ttyp != tp "
8b90699b
MD
289 "%p/%p\n", sp->s_ttyp, tp);
290 }
291#endif
292 }
293}
294
5fd012e0 295/*
f1aeb0c0 296 * Release the tty vnode association for a session. This is the
84cca6ec
MD
297 * 'other half' of the close. Because multiple opens of /dev/tty
298 * only generate a single open to the actual tty, the file modes
299 * are locked to FREAD|FWRITE.
f1aeb0c0
MD
300 *
301 * If dorevoke is non-zero, the session is also revoked. We have to
302 * close the vnode if VCTTYISOPEN is set.
5fd012e0
MD
303 */
304void
f1aeb0c0 305ttyclosesession(struct session *sp, int dorevoke)
5fd012e0
MD
306{
307 struct vnode *vp;
5fd012e0 308
f1aeb0c0
MD
309retry:
310 /*
311 * There may not be a controlling terminal or it may have been closed
312 * out from under us.
313 */
5fd012e0
MD
314 if ((vp = sp->s_ttyvp) == NULL)
315 return;
f1aeb0c0
MD
316
317 /*
318 * We need a lock if we have to close or revoke.
319 */
320 if ((vp->v_flag & VCTTYISOPEN) || dorevoke) {
321 vhold(vp);
322 if (vn_lock(vp, LK_EXCLUSIVE|LK_RETRY)) {
323 vdrop(vp);
324 goto retry;
325 }
326
327 /*
328 * Retry if the vnode was ripped out from under us
329 */
330 if (vp != sp->s_ttyvp) {
331 vn_unlock(vp);
332 vdrop(vp);
333 goto retry;
334 }
335
336 /*
337 * Close and revoke as needed
338 */
339 sp->s_ttyvp = NULL;
340 if (vp->v_flag & VCTTYISOPEN) {
5fd012e0 341 vclrflags(vp, VCTTYISOPEN);
87de5057 342 VOP_CLOSE(vp, FREAD|FWRITE);
5fd012e0 343 }
f1aeb0c0 344 vn_unlock(vp);
b8477cda
MD
345 if (dorevoke)
346 vrevoke(vp, proc0.p_ucred);
f1aeb0c0
MD
347 vdrop(vp);
348 } else {
349 sp->s_ttyvp = NULL;
5fd012e0 350 }
f1aeb0c0 351 vrele(vp);
5fd012e0
MD
352}
353
984263bc
MD
354#define FLUSHQ(q) { \
355 if ((q)->c_cc) \
356 ndflush(q, (q)->c_cc); \
357}
358
359/* Is 'c' a line delimiter ("break" character)? */
360#define TTBREAKC(c, lflag) \
361 ((c) == '\n' || (((c) == cc[VEOF] || \
362 (c) == cc[VEOL] || ((c) == cc[VEOL2] && lflag & IEXTEN)) && \
363 (c) != _POSIX_VDISABLE))
364
365/*
366 * Process input of a single character received on a tty.
367 */
368int
c972a82f 369ttyinput(int c, struct tty *tp)
984263bc 370{
1fd87d54
RG
371 tcflag_t iflag, lflag;
372 cc_t *cc;
984263bc
MD
373 int i, err;
374
375 /*
376 * If input is pending take it first.
377 */
378 lflag = tp->t_lflag;
379 if (ISSET(lflag, PENDIN))
380 ttypend(tp);
381 /*
382 * Gather stats.
383 */
f5d21610 384 if (ISSET(lflag, ICANON))
984263bc 385 ++tp->t_cancc;
f5d21610 386 else
984263bc 387 ++tp->t_rawcc;
984263bc
MD
388 ++tk_nin;
389
390 /*
391 * Block further input iff:
392 * current input > threshold AND input is available to user program
393 * AND input flow control is enabled and not yet invoked.
394 * The 3 is slop for PARMRK.
395 */
396 iflag = tp->t_iflag;
397 if (tp->t_rawq.c_cc + tp->t_canq.c_cc > tp->t_ihiwat - 3 &&
398 (!ISSET(lflag, ICANON) || tp->t_canq.c_cc != 0) &&
399 (ISSET(tp->t_cflag, CRTS_IFLOW) || ISSET(iflag, IXOFF)) &&
400 !ISSET(tp->t_state, TS_TBLOCK))
401 ttyblock(tp);
402
403 /* Handle exceptional conditions (break, parity, framing). */
404 cc = tp->t_cc;
405 err = (ISSET(c, TTY_ERRORMASK));
406 if (err) {
407 CLR(c, TTY_ERRORMASK);
408 if (ISSET(err, TTY_BI)) {
409 if (ISSET(iflag, IGNBRK))
410 return (0);
411 if (ISSET(iflag, BRKINT)) {
412 ttyflush(tp, FREAD | FWRITE);
413 pgsignal(tp->t_pgrp, SIGINT, 1);
414 goto endcase;
415 }
416 if (ISSET(iflag, PARMRK))
417 goto parmrk;
418 } else if ((ISSET(err, TTY_PE) && ISSET(iflag, INPCK))
419 || ISSET(err, TTY_FE)) {
420 if (ISSET(iflag, IGNPAR))
421 return (0);
422 else if (ISSET(iflag, PARMRK)) {
423parmrk:
424 if (tp->t_rawq.c_cc + tp->t_canq.c_cc >
425 MAX_INPUT - 3)
426 goto input_overflow;
0ced1954
MD
427 clist_putc(0377 | TTY_QUOTE, &tp->t_rawq);
428 clist_putc(0 | TTY_QUOTE, &tp->t_rawq);
429 clist_putc(c | TTY_QUOTE, &tp->t_rawq);
984263bc
MD
430 goto endcase;
431 } else
432 c = 0;
433 }
434 }
435
436 if (!ISSET(tp->t_state, TS_TYPEN) && ISSET(iflag, ISTRIP))
437 CLR(c, 0x80);
438 if (!ISSET(lflag, EXTPROC)) {
439 /*
440 * Check for literal nexting very first
441 */
442 if (ISSET(tp->t_state, TS_LNCH)) {
443 SET(c, TTY_QUOTE);
444 CLR(tp->t_state, TS_LNCH);
445 }
446 /*
447 * Scan for special characters. This code
448 * is really just a big case statement with
449 * non-constant cases. The bottom of the
450 * case statement is labeled ``endcase'', so goto
451 * it after a case match, or similar.
452 */
453
454 /*
455 * Control chars which aren't controlled
456 * by ICANON, ISIG, or IXON.
457 */
458 if (ISSET(lflag, IEXTEN)) {
459 if (CCEQ(cc[VLNEXT], c)) {
460 if (ISSET(lflag, ECHO)) {
461 if (ISSET(lflag, ECHOE)) {
462 (void)ttyoutput('^', tp);
463 (void)ttyoutput('\b', tp);
464 } else
465 ttyecho(c, tp);
466 }
467 SET(tp->t_state, TS_LNCH);
468 goto endcase;
469 }
470 if (CCEQ(cc[VDISCARD], c)) {
471 if (ISSET(lflag, FLUSHO))
472 CLR(tp->t_lflag, FLUSHO);
473 else {
474 ttyflush(tp, FWRITE);
475 ttyecho(c, tp);
476 if (tp->t_rawq.c_cc + tp->t_canq.c_cc)
477 ttyretype(tp);
478 SET(tp->t_lflag, FLUSHO);
479 }
480 goto startoutput;
481 }
482 }
483 /*
484 * Signals.
485 */
486 if (ISSET(lflag, ISIG)) {
487 if (CCEQ(cc[VINTR], c) || CCEQ(cc[VQUIT], c)) {
488 if (!ISSET(lflag, NOFLSH))
489 ttyflush(tp, FREAD | FWRITE);
490 ttyecho(c, tp);
491 pgsignal(tp->t_pgrp,
492 CCEQ(cc[VINTR], c) ? SIGINT : SIGQUIT, 1);
493 goto endcase;
494 }
495 if (CCEQ(cc[VSUSP], c)) {
496 if (!ISSET(lflag, NOFLSH))
497 ttyflush(tp, FREAD);
498 ttyecho(c, tp);
499 pgsignal(tp->t_pgrp, SIGTSTP, 1);
500 goto endcase;
501 }
502 }
503 /*
504 * Handle start/stop characters.
505 */
506 if (ISSET(iflag, IXON)) {
507 if (CCEQ(cc[VSTOP], c)) {
508 if (!ISSET(tp->t_state, TS_TTSTOP)) {
509 SET(tp->t_state, TS_TTSTOP);
510 (*tp->t_stop)(tp, 0);
511 return (0);
512 }
513 if (!CCEQ(cc[VSTART], c))
514 return (0);
515 /*
516 * if VSTART == VSTOP then toggle
517 */
518 goto endcase;
519 }
520 if (CCEQ(cc[VSTART], c))
521 goto restartoutput;
522 }
523 /*
524 * IGNCR, ICRNL, & INLCR
525 */
526 if (c == '\r') {
527 if (ISSET(iflag, IGNCR))
528 return (0);
529 else if (ISSET(iflag, ICRNL))
530 c = '\n';
531 } else if (c == '\n' && ISSET(iflag, INLCR))
532 c = '\r';
533 }
534 if (!ISSET(tp->t_lflag, EXTPROC) && ISSET(lflag, ICANON)) {
535 /*
536 * From here on down canonical mode character
537 * processing takes place.
538 */
539 /*
540 * erase or erase2 (^H / ^?)
541 */
542 if (CCEQ(cc[VERASE], c) || CCEQ(cc[VERASE2], c) ) {
543 if (tp->t_rawq.c_cc)
0ced1954 544 ttyrub(clist_unputc(&tp->t_rawq), tp);
984263bc
MD
545 goto endcase;
546 }
547 /*
548 * kill (^U)
549 */
550 if (CCEQ(cc[VKILL], c)) {
551 if (ISSET(lflag, ECHOKE) &&
552 tp->t_rawq.c_cc == tp->t_rocount &&
553 !ISSET(lflag, ECHOPRT))
554 while (tp->t_rawq.c_cc)
0ced1954 555 ttyrub(clist_unputc(&tp->t_rawq), tp);
984263bc
MD
556 else {
557 ttyecho(c, tp);
558 if (ISSET(lflag, ECHOK) ||
559 ISSET(lflag, ECHOKE))
560 ttyecho('\n', tp);
561 FLUSHQ(&tp->t_rawq);
562 tp->t_rocount = 0;
563 }
564 CLR(tp->t_state, TS_LOCAL);
565 goto endcase;
566 }
567 /*
568 * word erase (^W)
569 */
570 if (CCEQ(cc[VWERASE], c) && ISSET(lflag, IEXTEN)) {
571 int ctype;
572
573 /*
574 * erase whitespace
575 */
0ced1954 576 while ((c = clist_unputc(&tp->t_rawq)) == ' ' || c == '\t')
984263bc
MD
577 ttyrub(c, tp);
578 if (c == -1)
579 goto endcase;
580 /*
581 * erase last char of word and remember the
582 * next chars type (for ALTWERASE)
583 */
584 ttyrub(c, tp);
0ced1954 585 c = clist_unputc(&tp->t_rawq);
984263bc
MD
586 if (c == -1)
587 goto endcase;
588 if (c == ' ' || c == '\t') {
0ced1954 589 clist_putc(c, &tp->t_rawq);
984263bc
MD
590 goto endcase;
591 }
592 ctype = ISALPHA(c);
593 /*
594 * erase rest of word
595 */
596 do {
597 ttyrub(c, tp);
0ced1954 598 c = clist_unputc(&tp->t_rawq);
984263bc
MD
599 if (c == -1)
600 goto endcase;
601 } while (c != ' ' && c != '\t' &&
602 (!ISSET(lflag, ALTWERASE) || ISALPHA(c) == ctype));
0ced1954 603 clist_putc(c, &tp->t_rawq);
984263bc
MD
604 goto endcase;
605 }
606 /*
607 * reprint line (^R)
608 */
609 if (CCEQ(cc[VREPRINT], c) && ISSET(lflag, IEXTEN)) {
610 ttyretype(tp);
611 goto endcase;
612 }
613 /*
614 * ^T - kernel info and generate SIGINFO
615 */
616 if (CCEQ(cc[VSTATUS], c) && ISSET(lflag, IEXTEN)) {
617 if (ISSET(lflag, ISIG))
618 pgsignal(tp->t_pgrp, SIGINFO, 1);
619 if (!ISSET(lflag, NOKERNINFO))
620 ttyinfo(tp);
621 goto endcase;
622 }
dcf5aa01
MD
623 if (CCEQ(cc[VCHECKPT], c) && ISSET(lflag, IEXTEN)) {
624 if (ISSET(lflag, ISIG))
625 pgsignal(tp->t_pgrp, SIGCKPT, 1);
626 goto endcase;
627 }
984263bc
MD
628 }
629 /*
630 * Check for input buffer overflow
631 */
632 if (tp->t_rawq.c_cc + tp->t_canq.c_cc >= MAX_INPUT) {
633input_overflow:
634 if (ISSET(iflag, IMAXBEL)) {
635 if (tp->t_outq.c_cc < tp->t_ohiwat)
636 (void)ttyoutput(CTRL('g'), tp);
637 }
638 goto endcase;
639 }
640
641 if ( c == 0377 && ISSET(iflag, PARMRK) && !ISSET(iflag, ISTRIP)
642 && ISSET(iflag, IGNBRK|IGNPAR) != (IGNBRK|IGNPAR))
0ced1954 643 clist_putc(0377 | TTY_QUOTE, &tp->t_rawq);
984263bc
MD
644
645 /*
646 * Put data char in q for user and
647 * wakeup on seeing a line delimiter.
648 */
0ced1954 649 if (clist_putc(c, &tp->t_rawq) >= 0) {
984263bc
MD
650 if (!ISSET(lflag, ICANON)) {
651 ttwakeup(tp);
652 ttyecho(c, tp);
653 goto endcase;
654 }
655 if (TTBREAKC(c, lflag)) {
656 tp->t_rocount = 0;
657 catq(&tp->t_rawq, &tp->t_canq);
658 ttwakeup(tp);
659 } else if (tp->t_rocount++ == 0)
660 tp->t_rocol = tp->t_column;
661 if (ISSET(tp->t_state, TS_ERASE)) {
662 /*
663 * end of prterase \.../
664 */
665 CLR(tp->t_state, TS_ERASE);
666 (void)ttyoutput('/', tp);
667 }
668 i = tp->t_column;
669 ttyecho(c, tp);
670 if (CCEQ(cc[VEOF], c) && ISSET(lflag, ECHO)) {
671 /*
672 * Place the cursor over the '^' of the ^D.
673 */
674 i = imin(2, tp->t_column - i);
675 while (i > 0) {
676 (void)ttyoutput('\b', tp);
677 i--;
678 }
679 }
680 }
681endcase:
682 /*
683 * IXANY means allow any character to restart output.
684 */
685 if (ISSET(tp->t_state, TS_TTSTOP) &&
686 !ISSET(iflag, IXANY) && cc[VSTART] != cc[VSTOP])
687 return (0);
688restartoutput:
689 CLR(tp->t_lflag, FLUSHO);
690 CLR(tp->t_state, TS_TTSTOP);
691startoutput:
692 return (ttstart(tp));
693}
694
695/*
696 * Output a single character on a tty, doing output processing
697 * as needed (expanding tabs, newline processing, etc.).
698 * Returns < 0 if succeeds, otherwise returns char to resend.
699 * Must be recursive.
700 */
701static int
c972a82f 702ttyoutput(int c, struct tty *tp)
984263bc 703{
1fd87d54 704 tcflag_t oflag;
e43a034f 705 int col;
984263bc
MD
706
707 oflag = tp->t_oflag;
708 if (!ISSET(oflag, OPOST)) {
709 if (ISSET(tp->t_lflag, FLUSHO))
710 return (-1);
0ced1954 711 if (clist_putc(c, &tp->t_outq))
984263bc
MD
712 return (c);
713 tk_nout++;
714 tp->t_outcc++;
715 return (-1);
716 }
717 /*
718 * Do tab expansion if OXTABS is set. Special case if we external
719 * processing, we don't do the tab expansion because we'll probably
720 * get it wrong. If tab expansion needs to be done, let it happen
721 * externally.
722 */
723 CLR(c, ~TTY_CHARMASK);
724 if (c == '\t' &&
725 ISSET(oflag, OXTABS) && !ISSET(tp->t_lflag, EXTPROC)) {
726 c = 8 - (tp->t_column & 7);
727 if (!ISSET(tp->t_lflag, FLUSHO)) {
e43a034f 728 crit_enter(); /* Don't interrupt tabs. */
984263bc
MD
729 c -= b_to_q(" ", c, &tp->t_outq);
730 tk_nout += c;
731 tp->t_outcc += c;
e43a034f 732 crit_exit();
984263bc
MD
733 }
734 tp->t_column += c;
735 return (c ? -1 : '\t');
736 }
737 if (c == CEOT && ISSET(oflag, ONOEOT))
738 return (-1);
739
740 /*
741 * Newline translation: if ONLCR is set,
742 * translate newline into "\r\n".
743 */
744 if (c == '\n' && ISSET(tp->t_oflag, ONLCR)) {
745 tk_nout++;
746 tp->t_outcc++;
0ced1954 747 if (!ISSET(tp->t_lflag, FLUSHO) && clist_putc('\r', &tp->t_outq))
984263bc
MD
748 return (c);
749 }
750 /* If OCRNL is set, translate "\r" into "\n". */
751 else if (c == '\r' && ISSET(tp->t_oflag, OCRNL))
752 c = '\n';
753 /* If ONOCR is set, don't transmit CRs when on column 0. */
754 else if (c == '\r' && ISSET(tp->t_oflag, ONOCR) && tp->t_column == 0)
755 return (-1);
756
757 tk_nout++;
758 tp->t_outcc++;
0ced1954 759 if (!ISSET(tp->t_lflag, FLUSHO) && clist_putc(c, &tp->t_outq))
984263bc
MD
760 return (c);
761
762 col = tp->t_column;
763 switch (CCLASS(c)) {
764 case BACKSPACE:
765 if (col > 0)
766 --col;
767 break;
768 case CONTROL:
769 break;
770 case NEWLINE:
771 if (ISSET(tp->t_oflag, ONLCR | ONLRET))
772 col = 0;
773 break;
774 case RETURN:
775 col = 0;
776 break;
777 case ORDINARY:
778 ++col;
779 break;
780 case TAB:
781 col = (col + 8) & ~7;
782 break;
783 }
784 tp->t_column = col;
785 return (-1);
786}
787
788/*
789 * Ioctls for all tty devices. Called after line-discipline specific ioctl
790 * has been called to do discipline-specific functions and/or reject any
791 * of these ioctl commands.
792 */
793/* ARGSUSED */
794int
dadab5e9 795ttioctl(struct tty *tp, u_long cmd, void *data, int flag)
984263bc 796{
dadab5e9 797 struct thread *td = curthread;
08f2f1bb 798 struct lwp *lp = td->td_lwp;
dadab5e9 799 struct proc *p = td->td_proc;
e43a034f 800 int error;
984263bc 801
dadab5e9
MD
802 KKASSERT(p);
803
984263bc
MD
804 /* If the ioctl involves modification, hang if in the background. */
805 switch (cmd) {
806 case TIOCCBRK:
807 case TIOCCONS:
808 case TIOCDRAIN:
809 case TIOCEXCL:
810 case TIOCFLUSH:
811#ifdef TIOCHPCL
812 case TIOCHPCL:
813#endif
814 case TIOCNXCL:
815 case TIOCSBRK:
816 case TIOCSCTTY:
817 case TIOCSDRAINWAIT:
818 case TIOCSETA:
819 case TIOCSETAF:
820 case TIOCSETAW:
821 case TIOCSETD:
822 case TIOCSPGRP:
823 case TIOCSTART:
824 case TIOCSTAT:
825 case TIOCSTI:
826 case TIOCSTOP:
827 case TIOCSWINSZ:
828#if defined(COMPAT_43) || defined(COMPAT_SUNOS)
829 case TIOCLBIC:
830 case TIOCLBIS:
831 case TIOCLSET:
832 case TIOCSETC:
833 case OTIOCSETD:
834 case TIOCSETN:
835 case TIOCSETP:
836 case TIOCSLTC:
837#endif
838 while (isbackground(p, tp) && !(p->p_flag & P_PPWAIT) &&
839 !SIGISMEMBER(p->p_sigignore, SIGTTOU) &&
08f2f1bb 840 !SIGISMEMBER(lp->lwp_sigmask, SIGTTOU)) {
984263bc
MD
841 if (p->p_pgrp->pg_jobc == 0)
842 return (EIO);
843 pgsignal(p->p_pgrp, SIGTTOU, 1);
377d4740 844 error = ttysleep(tp, &lbolt, PCATCH, "ttybg1",
984263bc
MD
845 0);
846 if (error)
847 return (error);
848 }
849 break;
850 }
851
852 switch (cmd) { /* Process the ioctl. */
853 case FIOASYNC: /* set/clear async i/o */
e43a034f 854 crit_enter();
984263bc
MD
855 if (*(int *)data)
856 SET(tp->t_state, TS_ASYNC);
857 else
858 CLR(tp->t_state, TS_ASYNC);
e43a034f 859 crit_exit();
984263bc 860 break;
984263bc 861 case FIONREAD: /* get # bytes to read */
e43a034f 862 crit_enter();
984263bc 863 *(int *)data = ttnread(tp);
e43a034f 864 crit_exit();
984263bc
MD
865 break;
866
867 case FIOSETOWN:
868 /*
869 * Policy -- Don't allow FIOSETOWN on someone else's
870 * controlling tty
871 */
872 if (tp->t_session != NULL && !isctty(p, tp))
873 return (ENOTTY);
874
875 error = fsetown(*(int *)data, &tp->t_sigio);
876 if (error)
877 return (error);
878 break;
879 case FIOGETOWN:
880 if (tp->t_session != NULL && !isctty(p, tp))
881 return (ENOTTY);
882 *(int *)data = fgetown(tp->t_sigio);
883 break;
884
885 case TIOCEXCL: /* set exclusive use of tty */
e43a034f 886 crit_enter();
984263bc 887 SET(tp->t_state, TS_XCLUDE);
e43a034f 888 crit_exit();
984263bc
MD
889 break;
890 case TIOCFLUSH: { /* flush buffers */
1fd87d54 891 int flags = *(int *)data;
984263bc
MD
892
893 if (flags == 0)
894 flags = FREAD | FWRITE;
895 else
896 flags &= FREAD | FWRITE;
897 ttyflush(tp, flags);
898 break;
899 }
900 case TIOCCONS: /* become virtual console */
901 if (*(int *)data) {
902 if (constty && constty != tp &&
903 ISSET(constty->t_state, TS_CONNECTED))
904 return (EBUSY);
905#ifndef UCONSOLE
895c1f85 906 if ((error = priv_check(td, PRIV_ROOT)) != 0)
984263bc
MD
907 return (error);
908#endif
909 constty = tp;
910 } else if (tp == constty)
911 constty = NULL;
912 break;
913 case TIOCDRAIN: /* wait till output drained */
914 error = ttywait(tp);
915 if (error)
916 return (error);
917 break;
918 case TIOCGETA: { /* get termios struct */
919 struct termios *t = (struct termios *)data;
920
921 bcopy(&tp->t_termios, t, sizeof(struct termios));
922 break;
923 }
924 case TIOCGETD: /* get line discipline */
925 *(int *)data = tp->t_line;
926 break;
927 case TIOCGWINSZ: /* get window size */
928 *(struct winsize *)data = tp->t_winsize;
929 break;
930 case TIOCGPGRP: /* get pgrp of tty */
931 if (!isctty(p, tp))
932 return (ENOTTY);
933 *(int *)data = tp->t_pgrp ? tp->t_pgrp->pg_id : NO_PID;
934 break;
fa94d286
PA
935 case TIOCGSID: /* get sid of tty */
936 if (!isctty(p, tp))
937 return (ENOTTY);
938 *(int *)data = tp->t_session->s_sid;
939 break;
984263bc
MD
940#ifdef TIOCHPCL
941 case TIOCHPCL: /* hang up on last close */
e43a034f 942 crit_enter();
984263bc 943 SET(tp->t_cflag, HUPCL);
e43a034f 944 crit_exit();
984263bc
MD
945 break;
946#endif
947 case TIOCNXCL: /* reset exclusive use of tty */
e43a034f 948 crit_enter();
984263bc 949 CLR(tp->t_state, TS_XCLUDE);
e43a034f 950 crit_exit();
984263bc
MD
951 break;
952 case TIOCOUTQ: /* output queue size */
953 *(int *)data = tp->t_outq.c_cc;
954 break;
955 case TIOCSETA: /* set termios struct */
956 case TIOCSETAW: /* drain output, set */
957 case TIOCSETAF: { /* drn out, fls in, set */
1fd87d54 958 struct termios *t = (struct termios *)data;
984263bc
MD
959
960 if (t->c_ispeed == 0)
961 t->c_ispeed = t->c_ospeed;
962 if (t->c_ispeed == 0)
963 t->c_ispeed = tp->t_ospeed;
964 if (t->c_ispeed == 0)
965 return (EINVAL);
e43a034f 966 crit_enter();
984263bc
MD
967 if (cmd == TIOCSETAW || cmd == TIOCSETAF) {
968 error = ttywait(tp);
969 if (error) {
e43a034f 970 crit_exit();
984263bc
MD
971 return (error);
972 }
973 if (cmd == TIOCSETAF)
974 ttyflush(tp, FREAD);
975 }
976 if (!ISSET(t->c_cflag, CIGNORE)) {
977 /*
978 * Set device hardware.
979 */
980 if (tp->t_param && (error = (*tp->t_param)(tp, t))) {
e43a034f 981 crit_exit();
984263bc
MD
982 return (error);
983 }
984 if (ISSET(t->c_cflag, CLOCAL) &&
985 !ISSET(tp->t_cflag, CLOCAL)) {
986 /*
987 * XXX disconnections would be too hard to
988 * get rid of without this kludge. The only
989 * way to get rid of controlling terminals
990 * is to exit from the session leader.
991 */
992 CLR(tp->t_state, TS_ZOMBIE);
993
994 wakeup(TSA_CARR_ON(tp));
995 ttwakeup(tp);
996 ttwwakeup(tp);
997 }
998 if ((ISSET(tp->t_state, TS_CARR_ON) ||
999 ISSET(t->c_cflag, CLOCAL)) &&
1000 !ISSET(tp->t_state, TS_ZOMBIE))
1001 SET(tp->t_state, TS_CONNECTED);
1002 else
1003 CLR(tp->t_state, TS_CONNECTED);
1004 tp->t_cflag = t->c_cflag;
1005 tp->t_ispeed = t->c_ispeed;
1006 if (t->c_ospeed != 0)
1007 tp->t_ospeed = t->c_ospeed;
1008 ttsetwater(tp);
1009 }
1010 if (ISSET(t->c_lflag, ICANON) != ISSET(tp->t_lflag, ICANON) &&
1011 cmd != TIOCSETAF) {
1012 if (ISSET(t->c_lflag, ICANON))
1013 SET(tp->t_lflag, PENDIN);
1014 else {
1015 /*
1016 * XXX we really shouldn't allow toggling
1017 * ICANON while we're in a non-termios line
1018 * discipline. Now we have to worry about
1019 * panicing for a null queue.
1020 */
1021 if (tp->t_canq.c_cbreserved > 0 &&
1022 tp->t_rawq.c_cbreserved > 0) {
1023 catq(&tp->t_rawq, &tp->t_canq);
1024 /*
1025 * XXX the queue limits may be
1026 * different, so the old queue
1027 * swapping method no longer works.
1028 */
1029 catq(&tp->t_canq, &tp->t_rawq);
1030 }
1031 CLR(tp->t_lflag, PENDIN);
1032 }
1033 ttwakeup(tp);
1034 }
1035 tp->t_iflag = t->c_iflag;
1036 tp->t_oflag = t->c_oflag;
1037 /*
1038 * Make the EXTPROC bit read only.
1039 */
1040 if (ISSET(tp->t_lflag, EXTPROC))
1041 SET(t->c_lflag, EXTPROC);
1042 else
1043 CLR(t->c_lflag, EXTPROC);
1044 tp->t_lflag = t->c_lflag | ISSET(tp->t_lflag, PENDIN);
1045 if (t->c_cc[VMIN] != tp->t_cc[VMIN] ||
1046 t->c_cc[VTIME] != tp->t_cc[VTIME])
1047 ttwakeup(tp);
1048 bcopy(t->c_cc, tp->t_cc, sizeof(t->c_cc));
e43a034f 1049 crit_exit();
984263bc
MD
1050 break;
1051 }
1052 case TIOCSETD: { /* set line discipline */
1fd87d54 1053 int t = *(int *)data;
b13267a5 1054 cdev_t device = tp->t_dev;
984263bc
MD
1055
1056 if ((u_int)t >= nlinesw)
1057 return (ENXIO);
1058 if (t != tp->t_line) {
e43a034f 1059 crit_enter();
984263bc
MD
1060 (*linesw[tp->t_line].l_close)(tp, flag);
1061 error = (*linesw[t].l_open)(device, tp);
1062 if (error) {
1063 (void)(*linesw[tp->t_line].l_open)(device, tp);
e43a034f 1064 crit_exit();
984263bc
MD
1065 return (error);
1066 }
1067 tp->t_line = t;
e43a034f 1068 crit_exit();
984263bc
MD
1069 }
1070 break;
1071 }
1072 case TIOCSTART: /* start output, like ^Q */
e43a034f 1073 crit_enter();
984263bc
MD
1074 if (ISSET(tp->t_state, TS_TTSTOP) ||
1075 ISSET(tp->t_lflag, FLUSHO)) {
1076 CLR(tp->t_lflag, FLUSHO);
1077 CLR(tp->t_state, TS_TTSTOP);
1078 ttstart(tp);
1079 }
e43a034f 1080 crit_exit();
984263bc
MD
1081 break;
1082 case TIOCSTI: /* simulate terminal input */
895c1f85 1083 if ((flag & FREAD) == 0 && priv_check(td, PRIV_ROOT))
984263bc 1084 return (EPERM);
895c1f85 1085 if (!isctty(p, tp) && priv_check(td, PRIV_ROOT))
984263bc 1086 return (EACCES);
e43a034f 1087 crit_enter();
984263bc 1088 (*linesw[tp->t_line].l_rint)(*(u_char *)data, tp);
e43a034f 1089 crit_exit();
984263bc
MD
1090 break;
1091 case TIOCSTOP: /* stop output, like ^S */
e43a034f 1092 crit_enter();
984263bc
MD
1093 if (!ISSET(tp->t_state, TS_TTSTOP)) {
1094 SET(tp->t_state, TS_TTSTOP);
1095 (*tp->t_stop)(tp, 0);
1096 }
e43a034f 1097 crit_exit();
984263bc
MD
1098 break;
1099 case TIOCSCTTY: /* become controlling tty */
1100 /* Session ctty vnode pointer set in vnode layer. */
1101 if (!SESS_LEADER(p) ||
1102 ((p->p_session->s_ttyvp || tp->t_session) &&
1103 (tp->t_session != p->p_session)))
1104 return (EPERM);
1105 tp->t_session = p->p_session;
1106 tp->t_pgrp = p->p_pgrp;
1107 p->p_session->s_ttyp = tp;
1108 p->p_flag |= P_CONTROLT;
1109 break;
1110 case TIOCSPGRP: { /* set pgrp of tty */
3e28fb5c 1111 pid_t pgid = *(int *)data;
984263bc
MD
1112
1113 if (!isctty(p, tp))
1114 return (ENOTTY);
3e28fb5c
SK
1115 else if (pgid < 1 || pgid > PID_MAX)
1116 return (EINVAL);
1117 else {
1118 struct pgrp *pgrp = pgfind(pgid);
1119 if (pgrp == NULL || pgrp->pg_session != p->p_session)
1120 return (EPERM);
1121
1122 tp->t_pgrp = pgrp;
1123 }
984263bc
MD
1124 break;
1125 }
1126 case TIOCSTAT: /* simulate control-T */
e43a034f 1127 crit_enter();
984263bc 1128 ttyinfo(tp);
e43a034f 1129 crit_exit();
984263bc
MD
1130 break;
1131 case TIOCSWINSZ: /* set window size */
1132 if (bcmp((caddr_t)&tp->t_winsize, data,
1133 sizeof (struct winsize))) {
1134 tp->t_winsize = *(struct winsize *)data;
1135 pgsignal(tp->t_pgrp, SIGWINCH, 1);
1136 }
1137 break;
1138 case TIOCSDRAINWAIT:
895c1f85 1139 error = priv_check(td, PRIV_ROOT);
984263bc
MD
1140 if (error)
1141 return (error);
1142 tp->t_timeout = *(int *)data * hz;
1143 wakeup(TSA_OCOMPLETE(tp));
1144 wakeup(TSA_OLOWAT(tp));
1145 break;
1146 case TIOCGDRAINWAIT:
1147 *(int *)data = tp->t_timeout / hz;
1148 break;
1149 default:
1150#if defined(COMPAT_43) || defined(COMPAT_SUNOS)
1151 return (ttcompat(tp, cmd, data, flag));
1152#else
1153 return (ENOIOCTL);
1154#endif
1155 }
1156 return (0);
1157}
1158
984263bc 1159static struct filterops ttyread_filtops =
4c91dbc9 1160 { FILTEROP_ISFD, NULL, filt_ttyrdetach, filt_ttyread };
984263bc 1161static struct filterops ttywrite_filtops =
4c91dbc9 1162 { FILTEROP_ISFD, NULL, filt_ttywdetach, filt_ttywrite };
984263bc
MD
1163
1164int
fef8985e 1165ttykqfilter(struct dev_kqfilter_args *ap)
984263bc 1166{
b13267a5 1167 cdev_t dev = ap->a_head.a_dev;
fef8985e 1168 struct knote *kn = ap->a_kn;
984263bc
MD
1169 struct tty *tp = dev->si_tty;
1170 struct klist *klist;
984263bc 1171
fef8985e 1172 ap->a_result = 0;
984263bc
MD
1173 switch (kn->kn_filter) {
1174 case EVFILT_READ:
5b22f1a7 1175 klist = &tp->t_rkq.ki_note;
984263bc
MD
1176 kn->kn_fop = &ttyread_filtops;
1177 break;
1178 case EVFILT_WRITE:
5b22f1a7 1179 klist = &tp->t_wkq.ki_note;
984263bc
MD
1180 kn->kn_fop = &ttywrite_filtops;
1181 break;
1182 default:
b287d649 1183 ap->a_result = EOPNOTSUPP;
fef8985e 1184 return (0);
984263bc
MD
1185 }
1186
1187 kn->kn_hook = (caddr_t)dev;
5b22f1a7 1188 knote_insert(klist, kn);
984263bc
MD
1189
1190 return (0);
1191}
1192
1193static void
1194filt_ttyrdetach(struct knote *kn)
1195{
b13267a5 1196 struct tty *tp = ((cdev_t)kn->kn_hook)->si_tty;
984263bc 1197
5b22f1a7 1198 knote_remove(&tp->t_rkq.ki_note, kn);
984263bc
MD
1199}
1200
1201static int
1202filt_ttyread(struct knote *kn, long hint)
1203{
b13267a5 1204 struct tty *tp = ((cdev_t)kn->kn_hook)->si_tty;
984263bc
MD
1205
1206 kn->kn_data = ttnread(tp);
1207 if (ISSET(tp->t_state, TS_ZOMBIE)) {
1208 kn->kn_flags |= EV_EOF;
1209 return (1);
1210 }
1211 return (kn->kn_data > 0);
1212}
1213
1214static void
1215filt_ttywdetach(struct knote *kn)
1216{
b13267a5 1217 struct tty *tp = ((cdev_t)kn->kn_hook)->si_tty;
984263bc 1218
5b22f1a7 1219 knote_remove(&tp->t_wkq.ki_note, kn);
984263bc
MD
1220}
1221
1222static int
c972a82f 1223filt_ttywrite(struct knote *kn, long hint)
984263bc 1224{
b13267a5 1225 struct tty *tp = ((cdev_t)kn->kn_hook)->si_tty;
984263bc
MD
1226
1227 kn->kn_data = tp->t_outq.c_cc;
1228 if (ISSET(tp->t_state, TS_ZOMBIE))
1229 return (1);
1230 return (kn->kn_data <= tp->t_olowat &&
1231 ISSET(tp->t_state, TS_CONNECTED));
1232}
1233
1234/*
e43a034f 1235 * Must be called while in a critical section.
984263bc
MD
1236 */
1237static int
c972a82f 1238ttnread(struct tty *tp)
984263bc
MD
1239{
1240 int nread;
1241
1242 if (ISSET(tp->t_lflag, PENDIN))
1243 ttypend(tp);
1244 nread = tp->t_canq.c_cc;
1245 if (!ISSET(tp->t_lflag, ICANON)) {
1246 nread += tp->t_rawq.c_cc;
1247 if (nread < tp->t_cc[VMIN] && tp->t_cc[VTIME] == 0)
1248 nread = 0;
1249 }
1250 return (nread);
1251}
1252
1253/*
1254 * Wait for output to drain.
1255 */
1256int
c972a82f 1257ttywait(struct tty *tp)
984263bc 1258{
e43a034f 1259 int error;
984263bc
MD
1260
1261 error = 0;
e43a034f 1262 crit_enter();
984263bc
MD
1263 while ((tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY)) &&
1264 ISSET(tp->t_state, TS_CONNECTED) && tp->t_oproc) {
1265 (*tp->t_oproc)(tp);
1266 if ((tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY)) &&
1267 ISSET(tp->t_state, TS_CONNECTED)) {
1268 SET(tp->t_state, TS_SO_OCOMPLETE);
1269 error = ttysleep(tp, TSA_OCOMPLETE(tp),
377d4740 1270 PCATCH, "ttywai",
984263bc
MD
1271 tp->t_timeout);
1272 if (error) {
1273 if (error == EWOULDBLOCK)
1274 error = EIO;
1275 break;
1276 }
1277 } else
1278 break;
1279 }
1280 if (!error && (tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY)))
1281 error = EIO;
e43a034f 1282 crit_exit();
984263bc
MD
1283 return (error);
1284}
1285
1286/*
1287 * Flush if successfully wait.
1288 */
1289static int
c972a82f 1290ttywflush(struct tty *tp)
984263bc
MD
1291{
1292 int error;
1293
1294 if ((error = ttywait(tp)) == 0)
1295 ttyflush(tp, FREAD);
1296 return (error);
1297}
1298
1299/*
1300 * Flush tty read and/or write queues, notifying anyone waiting.
1301 */
1302void
c972a82f 1303ttyflush(struct tty *tp, int rw)
984263bc 1304{
e43a034f 1305 crit_enter();
984263bc
MD
1306#if 0
1307again:
1308#endif
1309 if (rw & FWRITE) {
1310 FLUSHQ(&tp->t_outq);
1311 CLR(tp->t_state, TS_TTSTOP);
1312 }
1313 (*tp->t_stop)(tp, rw);
1314 if (rw & FREAD) {
1315 FLUSHQ(&tp->t_canq);
1316 FLUSHQ(&tp->t_rawq);
1317 CLR(tp->t_lflag, PENDIN);
1318 tp->t_rocount = 0;
1319 tp->t_rocol = 0;
1320 CLR(tp->t_state, TS_LOCAL);
1321 ttwakeup(tp);
1322 if (ISSET(tp->t_state, TS_TBLOCK)) {
1323 if (rw & FWRITE)
1324 FLUSHQ(&tp->t_outq);
1325 ttyunblock(tp);
1326
1327 /*
1328 * Don't let leave any state that might clobber the
1329 * next line discipline (although we should do more
1330 * to send the START char). Not clearing the state
1331 * may have caused the "putc to a clist with no
6ea70f76 1332 * reserved cblocks" panic/kprintf.
984263bc
MD
1333 */
1334 CLR(tp->t_state, TS_TBLOCK);
1335
1336#if 0 /* forget it, sleeping isn't always safe and we don't know when it is */
1337 if (ISSET(tp->t_iflag, IXOFF)) {
1338 /*
1339 * XXX wait a bit in the hope that the stop
1340 * character (if any) will go out. Waiting
1341 * isn't good since it allows races. This
1342 * will be fixed when the stop character is
1343 * put in a special queue. Don't bother with
1344 * the checks in ttywait() since the timeout
1345 * will save us.
1346 */
1347 SET(tp->t_state, TS_SO_OCOMPLETE);
377d4740 1348 ttysleep(tp, TSA_OCOMPLETE(tp), 0,
984263bc
MD
1349 "ttyfls", hz / 10);
1350 /*
1351 * Don't try sending the stop character again.
1352 */
1353 CLR(tp->t_state, TS_TBLOCK);
1354 goto again;
1355 }
1356#endif
1357 }
1358 }
1359 if (rw & FWRITE) {
1360 FLUSHQ(&tp->t_outq);
1361 ttwwakeup(tp);
1362 }
e43a034f 1363 crit_exit();
984263bc
MD
1364}
1365
1366/*
1367 * Copy in the default termios characters.
1368 */
1369void
c972a82f 1370termioschars(struct termios *t)
984263bc
MD
1371{
1372
1373 bcopy(ttydefchars, t->c_cc, sizeof t->c_cc);
1374}
1375
1376/*
1377 * Old interface.
1378 */
1379void
c972a82f 1380ttychars(struct tty *tp)
984263bc
MD
1381{
1382
1383 termioschars(&tp->t_termios);
1384}
1385
1386/*
1387 * Handle input high water. Send stop character for the IXOFF case. Turn
1388 * on our input flow control bit and propagate the changes to the driver.
1389 * XXX the stop character should be put in a special high priority queue.
1390 */
1391void
c972a82f 1392ttyblock(struct tty *tp)
984263bc
MD
1393{
1394
1395 SET(tp->t_state, TS_TBLOCK);
1396 if (ISSET(tp->t_iflag, IXOFF) && tp->t_cc[VSTOP] != _POSIX_VDISABLE &&
0ced1954 1397 clist_putc(tp->t_cc[VSTOP], &tp->t_outq) != 0)
984263bc
MD
1398 CLR(tp->t_state, TS_TBLOCK); /* try again later */
1399 ttstart(tp);
1400}
1401
1402/*
1403 * Handle input low water. Send start character for the IXOFF case. Turn
1404 * off our input flow control bit and propagate the changes to the driver.
1405 * XXX the start character should be put in a special high priority queue.
1406 */
1407static void
c972a82f 1408ttyunblock(struct tty *tp)
984263bc
MD
1409{
1410
1411 CLR(tp->t_state, TS_TBLOCK);
1412 if (ISSET(tp->t_iflag, IXOFF) && tp->t_cc[VSTART] != _POSIX_VDISABLE &&
0ced1954 1413 clist_putc(tp->t_cc[VSTART], &tp->t_outq) != 0)
984263bc
MD
1414 SET(tp->t_state, TS_TBLOCK); /* try again later */
1415 ttstart(tp);
1416}
1417
1418#ifdef notyet
1419/* Not used by any current (i386) drivers. */
1420/*
1421 * Restart after an inter-char delay.
1422 */
1423void
c972a82f 1424ttrstrt(void *tp_arg)
984263bc
MD
1425{
1426 struct tty *tp;
984263bc
MD
1427
1428 KASSERT(tp_arg != NULL, ("ttrstrt"));
1429
1430 tp = tp_arg;
e43a034f 1431 crit_enter();
984263bc
MD
1432 CLR(tp->t_state, TS_TIMEOUT);
1433 ttstart(tp);
e43a034f 1434 crit_exit();
984263bc
MD
1435}
1436#endif
1437
1438int
c972a82f 1439ttstart(struct tty *tp)
984263bc
MD
1440{
1441
1442 if (tp->t_oproc != NULL) /* XXX: Kludge for pty. */
1443 (*tp->t_oproc)(tp);
1444 return (0);
1445}
1446
1447/*
1448 * "close" a line discipline
1449 */
1450int
c972a82f 1451ttylclose(struct tty *tp, int flag)
984263bc
MD
1452{
1453
1454 if (flag & FNONBLOCK || ttywflush(tp))
1455 ttyflush(tp, FREAD | FWRITE);
1456 return (0);
1457}
1458
1459/*
1460 * Handle modem control transition on a tty.
1461 * Flag indicates new state of carrier.
1462 * Returns 0 if the line should be turned off, otherwise 1.
1463 */
1464int
c972a82f 1465ttymodem(struct tty *tp, int flag)
984263bc
MD
1466{
1467
1468 if (ISSET(tp->t_state, TS_CARR_ON) && ISSET(tp->t_cflag, MDMBUF)) {
1469 /*
1470 * MDMBUF: do flow control according to carrier flag
1471 * XXX TS_CAR_OFLOW doesn't do anything yet. TS_TTSTOP
1472 * works if IXON and IXANY are clear.
1473 */
1474 if (flag) {
1475 CLR(tp->t_state, TS_CAR_OFLOW);
1476 CLR(tp->t_state, TS_TTSTOP);
1477 ttstart(tp);
1478 } else if (!ISSET(tp->t_state, TS_CAR_OFLOW)) {
1479 SET(tp->t_state, TS_CAR_OFLOW);
1480 SET(tp->t_state, TS_TTSTOP);
1481 (*tp->t_stop)(tp, 0);
1482 }
1483 } else if (flag == 0) {
1484 /*
1485 * Lost carrier.
1486 */
1487 CLR(tp->t_state, TS_CARR_ON);
1488 if (ISSET(tp->t_state, TS_ISOPEN) &&
1489 !ISSET(tp->t_cflag, CLOCAL)) {
1490 SET(tp->t_state, TS_ZOMBIE);
1491 CLR(tp->t_state, TS_CONNECTED);
1492 if (tp->t_session && tp->t_session->s_leader)
84204577 1493 ksignal(tp->t_session->s_leader, SIGHUP);
984263bc
MD
1494 ttyflush(tp, FREAD | FWRITE);
1495 return (0);
1496 }
1497 } else {
1498 /*
1499 * Carrier now on.
1500 */
1501 SET(tp->t_state, TS_CARR_ON);
1502 if (!ISSET(tp->t_state, TS_ZOMBIE))
1503 SET(tp->t_state, TS_CONNECTED);
1504 wakeup(TSA_CARR_ON(tp));
1505 ttwakeup(tp);
1506 ttwwakeup(tp);
1507 }
1508 return (1);
1509}
1510
1511/*
1512 * Reinput pending characters after state switch
e43a034f 1513 * call from a critical section.
984263bc
MD
1514 */
1515static void
c972a82f 1516ttypend(struct tty *tp)
984263bc
MD
1517{
1518 struct clist tq;
1fd87d54 1519 int c;
984263bc
MD
1520
1521 CLR(tp->t_lflag, PENDIN);
1522 SET(tp->t_state, TS_TYPEN);
1523 /*
1524 * XXX this assumes too much about clist internals. It may even
1525 * fail if the cblock slush pool is empty. We can't allocate more
1526 * cblocks here because we are called from an interrupt handler
1527 * and clist_alloc_cblocks() can wait.
1528 */
1529 tq = tp->t_rawq;
1530 bzero(&tp->t_rawq, sizeof tp->t_rawq);
1531 tp->t_rawq.c_cbmax = tq.c_cbmax;
1532 tp->t_rawq.c_cbreserved = tq.c_cbreserved;
0ced1954 1533 while ((c = clist_getc(&tq)) >= 0)
984263bc
MD
1534 ttyinput(c, tp);
1535 CLR(tp->t_state, TS_TYPEN);
1536}
1537
1538/*
1539 * Process a read call on a tty device.
1540 */
1541int
c972a82f 1542ttread(struct tty *tp, struct uio *uio, int flag)
984263bc 1543{
1fd87d54
RG
1544 struct clist *qp;
1545 int c;
1546 tcflag_t lflag;
1547 cc_t *cc = tp->t_cc;
142dd704 1548 struct proc *pp;
08f2f1bb 1549 struct lwp *lp;
e43a034f 1550 int first, error = 0;
984263bc
MD
1551 int has_stime = 0, last_cc = 0;
1552 long slp = 0; /* XXX this should be renamed `timo'. */
1553 struct timeval stime;
1554
08f2f1bb 1555 lp = curthread->td_lwp;
d557216f
MD
1556 stime.tv_sec = 0; /* fix compiler warnings */
1557 stime.tv_usec = 0;
08f2f1bb 1558
984263bc 1559loop:
e43a034f 1560 crit_enter();
984263bc
MD
1561 lflag = tp->t_lflag;
1562 /*
1563 * take pending input first
1564 */
1565 if (ISSET(lflag, PENDIN)) {
1566 ttypend(tp);
e43a034f 1567 splz(); /* reduce latency */
984263bc
MD
1568 lflag = tp->t_lflag; /* XXX ttypend() clobbers it */
1569 }
1570
1571 /*
1572 * Hang process if it's in the background.
1573 */
142dd704 1574 if ((pp = curproc) && isbackground(pp, tp)) {
e43a034f 1575 crit_exit();
142dd704 1576 if (SIGISMEMBER(pp->p_sigignore, SIGTTIN) ||
08f2f1bb 1577 SIGISMEMBER(lp->lwp_sigmask, SIGTTIN) ||
142dd704 1578 (pp->p_flag & P_PPWAIT) || pp->p_pgrp->pg_jobc == 0)
984263bc 1579 return (EIO);
142dd704 1580 pgsignal(pp->p_pgrp, SIGTTIN, 1);
377d4740 1581 error = ttysleep(tp, &lbolt, PCATCH, "ttybg2", 0);
984263bc
MD
1582 if (error)
1583 return (error);
1584 goto loop;
1585 }
1586
1587 if (ISSET(tp->t_state, TS_ZOMBIE)) {
e43a034f 1588 crit_exit();
984263bc
MD
1589 return (0); /* EOF */
1590 }
1591
1592 /*
1593 * If canonical, use the canonical queue,
1594 * else use the raw queue.
1595 *
1596 * (should get rid of clists...)
1597 */
1598 qp = ISSET(lflag, ICANON) ? &tp->t_canq : &tp->t_rawq;
1599
1600 if (flag & IO_NDELAY) {
1601 if (qp->c_cc > 0)
1602 goto read;
1603 if (!ISSET(lflag, ICANON) && cc[VMIN] == 0) {
e43a034f 1604 crit_exit();
984263bc
MD
1605 return (0);
1606 }
e43a034f 1607 crit_exit();
984263bc
MD
1608 return (EWOULDBLOCK);
1609 }
1610 if (!ISSET(lflag, ICANON)) {
1611 int m = cc[VMIN];
1612 long t = cc[VTIME];
1613 struct timeval timecopy;
1614
1615 /*
1616 * Check each of the four combinations.
1617 * (m > 0 && t == 0) is the normal read case.
1618 * It should be fairly efficient, so we check that and its
1619 * companion case (m == 0 && t == 0) first.
1620 * For the other two cases, we compute the target sleep time
1621 * into slp.
1622 */
1623 if (t == 0) {
1624 if (qp->c_cc < m)
1625 goto sleep;
1626 if (qp->c_cc > 0)
1627 goto read;
1628
1629 /* m, t and qp->c_cc are all 0. 0 is enough input. */
e43a034f 1630 crit_exit();
984263bc
MD
1631 return (0);
1632 }
1633 t *= 100000; /* time in us */
1634#define diff(t1, t2) (((t1).tv_sec - (t2).tv_sec) * 1000000 + \
1635 ((t1).tv_usec - (t2).tv_usec))
1636 if (m > 0) {
1637 if (qp->c_cc <= 0)
1638 goto sleep;
1639 if (qp->c_cc >= m)
1640 goto read;
1641 getmicrotime(&timecopy);
d557216f 1642 if (has_stime == 0) {
984263bc
MD
1643 /* first character, start timer */
1644 has_stime = 1;
1645 stime = timecopy;
1646 slp = t;
1647 } else if (qp->c_cc > last_cc) {
1648 /* got a character, restart timer */
1649 stime = timecopy;
1650 slp = t;
1651 } else {
1652 /* nothing, check expiration */
1653 slp = t - diff(timecopy, stime);
1654 if (slp <= 0)
1655 goto read;
1656 }
1657 last_cc = qp->c_cc;
1658 } else { /* m == 0 */
1659 if (qp->c_cc > 0)
1660 goto read;
1661 getmicrotime(&timecopy);
d557216f 1662 if (has_stime == 0) {
984263bc
MD
1663 has_stime = 1;
1664 stime = timecopy;
1665 slp = t;
1666 } else {
1667 slp = t - diff(timecopy, stime);
1668 if (slp <= 0) {
1669 /* Timed out, but 0 is enough input. */
e43a034f 1670 crit_exit();
984263bc
MD
1671 return (0);
1672 }
1673 }
1674 }
1675#undef diff
1676 /*
1677 * Rounding down may make us wake up just short
1678 * of the target, so we round up.
1679 * The formula is ceiling(slp * hz/1000000).
1680 * 32-bit arithmetic is enough for hz < 169.
1681 * XXX see tvtohz() for how to avoid overflow if hz
1682 * is large (divide by `tick' and/or arrange to
1683 * use tvtohz() if hz is large).
1684 */
1685 slp = (long) (((u_long)slp * hz) + 999999) / 1000000;
1686 goto sleep;
1687 }
1688 if (qp->c_cc <= 0) {
1689sleep:
1690 /*
1691 * There is no input, or not enough input and we can block.
1692 */
377d4740 1693 error = ttysleep(tp, TSA_HUP_OR_INPUT(tp), PCATCH,
984263bc
MD
1694 ISSET(tp->t_state, TS_CONNECTED) ?
1695 "ttyin" : "ttyhup", (int)slp);
e43a034f 1696 crit_exit();
984263bc
MD
1697 if (error == EWOULDBLOCK)
1698 error = 0;
1699 else if (error)
1700 return (error);
1701 /*
1702 * XXX what happens if another process eats some input
1703 * while we are asleep (not just here)? It would be
1704 * safest to detect changes and reset our state variables
1705 * (has_stime and last_cc).
1706 */
1707 slp = 0;
1708 goto loop;
1709 }
1710read:
e43a034f 1711 crit_exit();
984263bc
MD
1712 /*
1713 * Input present, check for input mapping and processing.
1714 */
1715 first = 1;
1716 if (ISSET(lflag, ICANON | ISIG))
1717 goto slowcase;
1718 for (;;) {
1719 char ibuf[IBUFSIZ];
1720 int icc;
1721
e54488bb 1722 icc = (int)szmin(uio->uio_resid, IBUFSIZ);
984263bc
MD
1723 icc = q_to_b(qp, ibuf, icc);
1724 if (icc <= 0) {
1725 if (first)
1726 goto loop;
1727 break;
1728 }
e54488bb 1729 error = uiomove(ibuf, (size_t)icc, uio);
984263bc
MD
1730 /*
1731 * XXX if there was an error then we should ungetc() the
1732 * unmoved chars and reduce icc here.
1733 */
1734 if (error)
1735 break;
1736 if (uio->uio_resid == 0)
1737 break;
1738 first = 0;
1739 }
1740 goto out;
1741slowcase:
1742 for (;;) {
0ced1954 1743 c = clist_getc(qp);
984263bc
MD
1744 if (c < 0) {
1745 if (first)
1746 goto loop;
1747 break;
1748 }
1749 /*
1750 * delayed suspend (^Y)
1751 */
1752 if (CCEQ(cc[VDSUSP], c) &&
1753 ISSET(lflag, IEXTEN | ISIG) == (IEXTEN | ISIG)) {
1754 pgsignal(tp->t_pgrp, SIGTSTP, 1);
1755 if (first) {
377d4740 1756 error = ttysleep(tp, &lbolt, PCATCH,
984263bc
MD
1757 "ttybg3", 0);
1758 if (error)
1759 break;
1760 goto loop;
1761 }
1762 break;
1763 }
1764 /*
1765 * Interpret EOF only in canonical mode.
1766 */
1767 if (CCEQ(cc[VEOF], c) && ISSET(lflag, ICANON))
1768 break;
1769 /*
1770 * Give user character.
1771 */
1772 error = ureadc(c, uio);
1773 if (error)
1774 /* XXX should ungetc(c, qp). */
1775 break;
1776 if (uio->uio_resid == 0)
1777 break;
1778 /*
1779 * In canonical mode check for a "break character"
1780 * marking the end of a "line of input".
1781 */
1782 if (ISSET(lflag, ICANON) && TTBREAKC(c, lflag))
1783 break;
1784 first = 0;
1785 }
1786
1787out:
1788 /*
1789 * Look to unblock input now that (presumably)
1790 * the input queue has gone down.
1791 */
e43a034f 1792 crit_enter();
984263bc
MD
1793 if (ISSET(tp->t_state, TS_TBLOCK) &&
1794 tp->t_rawq.c_cc + tp->t_canq.c_cc <= tp->t_ilowat)
1795 ttyunblock(tp);
e43a034f 1796 crit_exit();
984263bc
MD
1797
1798 return (error);
1799}
1800
1801/*
1802 * Check the output queue on tp for space for a kernel message (from uprintf
1803 * or tprintf). Allow some space over the normal hiwater mark so we don't
1804 * lose messages due to normal flow control, but don't let the tty run amok.
1805 * Sleeps here are not interruptible, but we return prematurely if new signals
1806 * arrive.
1807 */
1808int
c972a82f 1809ttycheckoutq(struct tty *tp, int wait)
984263bc 1810{
aa6c3de6 1811 struct lwp *lp = curthread->td_lwp;
e43a034f 1812 int hiwat;
aa6c3de6 1813 sigset_t oldset, newset;
984263bc
MD
1814
1815 hiwat = tp->t_ohiwat;
aa6c3de6
SS
1816 SIGEMPTYSET(oldset);
1817 SIGEMPTYSET(newset);
e43a034f 1818 crit_enter();
984263bc 1819 if (wait)
aa6c3de6 1820 oldset = lwp_sigpend(lp);
e43a034f 1821 if (tp->t_outq.c_cc > hiwat + OBUFSIZ + 100) {
984263bc
MD
1822 while (tp->t_outq.c_cc > hiwat) {
1823 ttstart(tp);
1824 if (tp->t_outq.c_cc <= hiwat)
1825 break;
aa6c3de6
SS
1826 if (wait)
1827 newset = lwp_sigpend(lp);
1828 if (!wait || SIGSETNEQ(oldset, newset)) {
e43a034f 1829 crit_exit();
984263bc
MD
1830 return (0);
1831 }
1832 SET(tp->t_state, TS_SO_OLOWAT);
377d4740 1833 tsleep(TSA_OLOWAT(tp), 0, "ttoutq", hz);
984263bc 1834 }
e43a034f
MD
1835 }
1836 crit_exit();
984263bc
MD
1837 return (1);
1838}
1839
1840/*
1841 * Process a write call on a tty device.
1842 */
1843int
c972a82f 1844ttwrite(struct tty *tp, struct uio *uio, int flag)
984263bc 1845{
1fd87d54
RG
1846 char *cp = NULL;
1847 int cc, ce;
142dd704 1848 struct proc *pp;
08f2f1bb 1849 struct lwp *lp;
e54488bb
MD
1850 int i, hiwat, error;
1851 size_t cnt;
1852
984263bc
MD
1853 char obuf[OBUFSIZ];
1854
08f2f1bb 1855 lp = curthread->td_lwp;
984263bc
MD
1856 hiwat = tp->t_ohiwat;
1857 cnt = uio->uio_resid;
1858 error = 0;
1859 cc = 0;
1860loop:
e43a034f 1861 crit_enter();
984263bc 1862 if (ISSET(tp->t_state, TS_ZOMBIE)) {
e43a034f 1863 crit_exit();
984263bc
MD
1864 if (uio->uio_resid == cnt)
1865 error = EIO;
1866 goto out;
1867 }
1868 if (!ISSET(tp->t_state, TS_CONNECTED)) {
1869 if (flag & IO_NDELAY) {
e43a034f 1870 crit_exit();
984263bc
MD
1871 error = EWOULDBLOCK;
1872 goto out;
1873 }
377d4740 1874 error = ttysleep(tp, TSA_CARR_ON(tp), PCATCH, "ttydcd", 0);
e43a034f 1875 crit_exit();
984263bc
MD
1876 if (error)
1877 goto out;
1878 goto loop;
1879 }
e43a034f 1880 crit_exit();
142dd704 1881
984263bc
MD
1882 /*
1883 * Hang the process if it's in the background.
1884 */
142dd704
MD
1885 if ((pp = curproc) && isbackground(pp, tp) &&
1886 ISSET(tp->t_lflag, TOSTOP) && !(pp->p_flag & P_PPWAIT) &&
1887 !SIGISMEMBER(pp->p_sigignore, SIGTTOU) &&
08f2f1bb 1888 !SIGISMEMBER(lp->lwp_sigmask, SIGTTOU)) {
142dd704 1889 if (pp->p_pgrp->pg_jobc == 0) {
984263bc
MD
1890 error = EIO;
1891 goto out;
1892 }
142dd704 1893 pgsignal(pp->p_pgrp, SIGTTOU, 1);
377d4740 1894 error = ttysleep(tp, &lbolt, PCATCH, "ttybg4", 0);
984263bc
MD
1895 if (error)
1896 goto out;
1897 goto loop;
1898 }
1899 /*
1900 * Process the user's data in at most OBUFSIZ chunks. Perform any
1901 * output translation. Keep track of high water mark, sleep on
1902 * overflow awaiting device aid in acquiring new space.
1903 */
1904 while (uio->uio_resid > 0 || cc > 0) {
1905 if (ISSET(tp->t_lflag, FLUSHO)) {
1906 uio->uio_resid = 0;
1907 return (0);
1908 }
1909 if (tp->t_outq.c_cc > hiwat)
1910 goto ovhiwat;
1911 /*
1912 * Grab a hunk of data from the user, unless we have some
1913 * leftover from last time.
1914 */
1915 if (cc == 0) {
e54488bb 1916 cc = szmin(uio->uio_resid, OBUFSIZ);
984263bc 1917 cp = obuf;
e54488bb 1918 error = uiomove(cp, (size_t)cc, uio);
984263bc
MD
1919 if (error) {
1920 cc = 0;
1921 break;
1922 }
1923 }
1924 /*
1925 * If nothing fancy need be done, grab those characters we
1926 * can handle without any of ttyoutput's processing and
1927 * just transfer them to the output q. For those chars
1928 * which require special processing (as indicated by the
1929 * bits in char_type), call ttyoutput. After processing
1930 * a hunk of data, look for FLUSHO so ^O's will take effect
1931 * immediately.
1932 */
1933 while (cc > 0) {
1934 if (!ISSET(tp->t_oflag, OPOST))
1935 ce = cc;
1936 else {
1937 ce = cc - scanc((u_int)cc, (u_char *)cp,
1938 char_type, CCLASSMASK);
1939 /*
1940 * If ce is zero, then we're processing
1941 * a special character through ttyoutput.
1942 */
1943 if (ce == 0) {
1944 tp->t_rocount = 0;
1945 if (ttyoutput(*cp, tp) >= 0) {
1946 /* No Clists, wait a bit. */
1947 ttstart(tp);
1948 if (flag & IO_NDELAY) {
1949 error = EWOULDBLOCK;
1950 goto out;
1951 }
1952 error = ttysleep(tp, &lbolt,
377d4740 1953 PCATCH,
984263bc
MD
1954 "ttybf1", 0);
1955 if (error)
1956 goto out;
1957 goto loop;
1958 }
1959 cp++;
1960 cc--;
1961 if (ISSET(tp->t_lflag, FLUSHO) ||
1962 tp->t_outq.c_cc > hiwat)
1963 goto ovhiwat;
1964 continue;
1965 }
1966 }
1967 /*
1968 * A bunch of normal characters have been found.
1969 * Transfer them en masse to the output queue and
1970 * continue processing at the top of the loop.
1971 * If there are any further characters in this
1972 * <= OBUFSIZ chunk, the first should be a character
1973 * requiring special handling by ttyoutput.
1974 */
1975 tp->t_rocount = 0;
1976 i = b_to_q(cp, ce, &tp->t_outq);
1977 ce -= i;
1978 tp->t_column += ce;
1979 cp += ce, cc -= ce, tk_nout += ce;
1980 tp->t_outcc += ce;
1981 if (i > 0) {
1982 /* No Clists, wait a bit. */
1983 ttstart(tp);
1984 if (flag & IO_NDELAY) {
1985 error = EWOULDBLOCK;
1986 goto out;
1987 }
377d4740 1988 error = ttysleep(tp, &lbolt, PCATCH,
984263bc
MD
1989 "ttybf2", 0);
1990 if (error)
1991 goto out;
1992 goto loop;
1993 }
1994 if (ISSET(tp->t_lflag, FLUSHO) ||
1995 tp->t_outq.c_cc > hiwat)
1996 break;
1997 }
1998 ttstart(tp);
1999 }
2000out:
2001 /*
2002 * If cc is nonzero, we leave the uio structure inconsistent, as the
2003 * offset and iov pointers have moved forward, but it doesn't matter
2004 * (the call will either return short or restart with a new uio).
2005 */
2006 uio->uio_resid += cc;
2007 return (error);
2008
2009ovhiwat:
2010 ttstart(tp);
e43a034f 2011 crit_enter();
984263bc
MD
2012 /*
2013 * This can only occur if FLUSHO is set in t_lflag,
2014 * or if ttstart/oproc is synchronous (or very fast).
2015 */
2016 if (tp->t_outq.c_cc <= hiwat) {
e43a034f 2017 crit_exit();
984263bc
MD
2018 goto loop;
2019 }
2020 if (flag & IO_NDELAY) {
e43a034f 2021 crit_exit();
984263bc
MD
2022 uio->uio_resid += cc;
2023 return (uio->uio_resid == cnt ? EWOULDBLOCK : 0);
2024 }
2025 SET(tp->t_state, TS_SO_OLOWAT);
377d4740 2026 error = ttysleep(tp, TSA_OLOWAT(tp), PCATCH, "ttywri", tp->t_timeout);
e43a034f 2027 crit_exit();
984263bc
MD
2028 if (error == EWOULDBLOCK)
2029 error = EIO;
2030 if (error)
2031 goto out;
2032 goto loop;
2033}
2034
2035/*
2036 * Rubout one character from the rawq of tp
2037 * as cleanly as possible.
2038 */
2039static void
c972a82f 2040ttyrub(int c, struct tty *tp)
984263bc 2041{
1fd87d54
RG
2042 char *cp;
2043 int savecol;
e43a034f 2044 int tabc;
984263bc
MD
2045
2046 if (!ISSET(tp->t_lflag, ECHO) || ISSET(tp->t_lflag, EXTPROC))
2047 return;
2048 CLR(tp->t_lflag, FLUSHO);
2049 if (ISSET(tp->t_lflag, ECHOE)) {
2050 if (tp->t_rocount == 0) {
2051 /*
2052 * Screwed by ttwrite; retype
2053 */
2054 ttyretype(tp);
2055 return;
2056 }
2057 if (c == ('\t' | TTY_QUOTE) || c == ('\n' | TTY_QUOTE))
2058 ttyrubo(tp, 2);
2059 else {
2060 CLR(c, ~TTY_CHARMASK);
2061 switch (CCLASS(c)) {
2062 case ORDINARY:
2063 ttyrubo(tp, 1);
2064 break;
2065 case BACKSPACE:
2066 case CONTROL:
2067 case NEWLINE:
2068 case RETURN:
2069 case VTAB:
2070 if (ISSET(tp->t_lflag, ECHOCTL))
2071 ttyrubo(tp, 2);
2072 break;
2073 case TAB:
2074 if (tp->t_rocount < tp->t_rawq.c_cc) {
2075 ttyretype(tp);
2076 return;
2077 }
e43a034f 2078 crit_enter();
984263bc
MD
2079 savecol = tp->t_column;
2080 SET(tp->t_state, TS_CNTTB);
2081 SET(tp->t_lflag, FLUSHO);
2082 tp->t_column = tp->t_rocol;
2083 cp = tp->t_rawq.c_cf;
2084 if (cp)
2085 tabc = *cp; /* XXX FIX NEXTC */
2086 for (; cp; cp = nextc(&tp->t_rawq, cp, &tabc))
2087 ttyecho(tabc, tp);
2088 CLR(tp->t_lflag, FLUSHO);
2089 CLR(tp->t_state, TS_CNTTB);
e43a034f 2090 crit_exit();
984263bc
MD
2091
2092 /* savecol will now be length of the tab. */
2093 savecol -= tp->t_column;
2094 tp->t_column += savecol;
2095 if (savecol > 8)
2096 savecol = 8; /* overflow screw */
2097 while (--savecol >= 0)
2098 (void)ttyoutput('\b', tp);
2099 break;
2100 default: /* XXX */
2101#define PANICSTR "ttyrub: would panic c = %d, val = %d\n"
6ea70f76 2102 (void)kprintf(PANICSTR, c, CCLASS(c));
984263bc
MD
2103#ifdef notdef
2104 panic(PANICSTR, c, CCLASS(c));
2105#endif
2106 }
2107 }
2108 } else if (ISSET(tp->t_lflag, ECHOPRT)) {
2109 if (!ISSET(tp->t_state, TS_ERASE)) {
2110 SET(tp->t_state, TS_ERASE);
2111 (void)ttyoutput('\\', tp);
2112 }
2113 ttyecho(c, tp);
2114 } else {
2115 ttyecho(tp->t_cc[VERASE], tp);
2116 /*
2117 * This code may be executed not only when an ERASE key
2118 * is pressed, but also when ^U (KILL) or ^W (WERASE) are.
2119 * So, I didn't think it was worthwhile to pass the extra
2120 * information (which would need an extra parameter,
2121 * changing every call) needed to distinguish the ERASE2
2122 * case from the ERASE.
2123 */
2124 }
2125 --tp->t_rocount;
2126}
2127
2128/*
2129 * Back over cnt characters, erasing them.
2130 */
2131static void
c972a82f 2132ttyrubo(struct tty *tp, int cnt)
984263bc
MD
2133{
2134
2135 while (cnt-- > 0) {
2136 (void)ttyoutput('\b', tp);
2137 (void)ttyoutput(' ', tp);
2138 (void)ttyoutput('\b', tp);
2139 }
2140}
2141
2142/*
2143 * ttyretype --
2144 * Reprint the rawq line. Note, it is assumed that c_cc has already
2145 * been checked.
2146 */
2147static void
c972a82f 2148ttyretype(struct tty *tp)
984263bc 2149{
1fd87d54 2150 char *cp;
e43a034f 2151 int c;
984263bc
MD
2152
2153 /* Echo the reprint character. */
2154 if (tp->t_cc[VREPRINT] != _POSIX_VDISABLE)
2155 ttyecho(tp->t_cc[VREPRINT], tp);
2156
2157 (void)ttyoutput('\n', tp);
2158
2159 /*
2160 * XXX
2161 * FIX: NEXTC IS BROKEN - DOESN'T CHECK QUOTE
2162 * BIT OF FIRST CHAR.
2163 */
e43a034f 2164 crit_enter();
984263bc
MD
2165 for (cp = tp->t_canq.c_cf, c = (cp != NULL ? *cp : 0);
2166 cp != NULL; cp = nextc(&tp->t_canq, cp, &c))
2167 ttyecho(c, tp);
2168 for (cp = tp->t_rawq.c_cf, c = (cp != NULL ? *cp : 0);
2169 cp != NULL; cp = nextc(&tp->t_rawq, cp, &c))
2170 ttyecho(c, tp);
2171 CLR(tp->t_state, TS_ERASE);
e43a034f 2172 crit_exit();
984263bc
MD
2173
2174 tp->t_rocount = tp->t_rawq.c_cc;
2175 tp->t_rocol = 0;
2176}
2177
2178/*
2179 * Echo a typed character to the terminal.
2180 */
2181static void
c972a82f 2182ttyecho(int c, struct tty *tp)
984263bc
MD
2183{
2184
2185 if (!ISSET(tp->t_state, TS_CNTTB))
2186 CLR(tp->t_lflag, FLUSHO);
2187 if ((!ISSET(tp->t_lflag, ECHO) &&
2188 (c != '\n' || !ISSET(tp->t_lflag, ECHONL))) ||
2189 ISSET(tp->t_lflag, EXTPROC))
2190 return;
2191 if (ISSET(tp->t_lflag, ECHOCTL) &&
2192 ((ISSET(c, TTY_CHARMASK) <= 037 && c != '\t' && c != '\n') ||
2193 ISSET(c, TTY_CHARMASK) == 0177)) {
2194 (void)ttyoutput('^', tp);
2195 CLR(c, ~TTY_CHARMASK);
2196 if (c == 0177)
2197 c = '?';
2198 else
2199 c += 'A' - 1;
2200 }
2201 (void)ttyoutput(c, tp);
2202}
2203
2204/*
2205 * Wake up any readers on a tty.
2206 */
2207void
c972a82f 2208ttwakeup(struct tty *tp)
984263bc
MD
2209{
2210
984263bc
MD
2211 if (ISSET(tp->t_state, TS_ASYNC) && tp->t_sigio != NULL)
2212 pgsigio(tp->t_sigio, SIGIO, (tp->t_session != NULL));
2213 wakeup(TSA_HUP_OR_INPUT(tp));
5b22f1a7 2214 KNOTE(&tp->t_rkq.ki_note, 0);
984263bc
MD
2215}
2216
2217/*
2218 * Wake up any writers on a tty.
2219 */
2220void
c972a82f 2221ttwwakeup(struct tty *tp)
984263bc
MD
2222{
2223
984263bc
MD
2224 if (ISSET(tp->t_state, TS_ASYNC) && tp->t_sigio != NULL)
2225 pgsigio(tp->t_sigio, SIGIO, (tp->t_session != NULL));
2226 if (ISSET(tp->t_state, TS_BUSY | TS_SO_OCOMPLETE) ==
2227 TS_SO_OCOMPLETE && tp->t_outq.c_cc == 0) {
2228 CLR(tp->t_state, TS_SO_OCOMPLETE);
2229 wakeup(TSA_OCOMPLETE(tp));
2230 }
2231 if (ISSET(tp->t_state, TS_SO_OLOWAT) &&
2232 tp->t_outq.c_cc <= tp->t_olowat) {
2233 CLR(tp->t_state, TS_SO_OLOWAT);
2234 wakeup(TSA_OLOWAT(tp));
2235 }
5b22f1a7 2236 KNOTE(&tp->t_wkq.ki_note, 0);
984263bc
MD
2237}
2238
2239/*
2240 * Look up a code for a specified speed in a conversion table;
2241 * used by drivers to map software speed values to hardware parameters.
2242 */
2243int
c972a82f 2244ttspeedtab(int speed, struct speedtab *table)
984263bc
MD
2245{
2246
2247 for ( ; table->sp_speed != -1; table++)
2248 if (table->sp_speed == speed)
2249 return (table->sp_code);
2250 return (-1);
2251}
2252
2253/*
2254 * Set input and output watermarks and buffer sizes. For input, the
2255 * high watermark is about one second's worth of input above empty, the
2256 * low watermark is slightly below high water, and the buffer size is a
2257 * driver-dependent amount above high water. For output, the watermarks
2258 * are near the ends of the buffer, with about 1 second's worth of input
2259 * between them. All this only applies to the standard line discipline.
2260 */
2261void
c972a82f 2262ttsetwater(struct tty *tp)
984263bc 2263{
1fd87d54 2264 int cps, ttmaxhiwat, x;
984263bc
MD
2265
2266 /* Input. */
2267 clist_alloc_cblocks(&tp->t_canq, TTYHOG, 512);
2268 switch (tp->t_ispeedwat) {
2269 case (speed_t)-1:
2270 cps = tp->t_ispeed / 10;
2271 break;
2272 case 0:
2273 /*
2274 * This case is for old drivers that don't know about
2275 * t_ispeedwat. Arrange for them to get the old buffer
2276 * sizes and watermarks.
2277 */
2278 cps = TTYHOG - 2 * 256;
2849f1e5 2279 tp->t_ififosize = 2 * 2048;
984263bc
MD
2280 break;
2281 default:
2282 cps = tp->t_ispeedwat / 10;
2283 break;
2284 }
2285 tp->t_ihiwat = cps;
2286 tp->t_ilowat = 7 * cps / 8;
2287 x = cps + tp->t_ififosize;
2288 clist_alloc_cblocks(&tp->t_rawq, x, x);
2289
2290 /* Output. */
2291 switch (tp->t_ospeedwat) {
2292 case (speed_t)-1:
2293 cps = tp->t_ospeed / 10;
2294 ttmaxhiwat = 2 * TTMAXHIWAT;
2295 break;
2296 case 0:
2297 cps = tp->t_ospeed / 10;
2298 ttmaxhiwat = TTMAXHIWAT;
2299 break;
2300 default:
2301 cps = tp->t_ospeedwat / 10;
2302 ttmaxhiwat = 8 * TTMAXHIWAT;
2303 break;
2304 }
2305#define CLAMP(x, h, l) ((x) > h ? h : ((x) < l) ? l : (x))
2306 tp->t_olowat = x = CLAMP(cps / 2, TTMAXLOWAT, TTMINLOWAT);
2307 x += cps;
2308 x = CLAMP(x, ttmaxhiwat, TTMINHIWAT); /* XXX clamps are too magic */
2309 tp->t_ohiwat = roundup(x, CBSIZE); /* XXX for compat */
2310 x = imax(tp->t_ohiwat, TTMAXHIWAT); /* XXX for compat/safety */
2311 x += OBUFSIZ + 100;
2312 clist_alloc_cblocks(&tp->t_outq, x, x);
2313#undef CLAMP
2314}
2315
2316/*
2317 * Report on state of foreground process group.
2318 */
2319void
c972a82f 2320ttyinfo(struct tty *tp)
984263bc 2321{
1fd87d54 2322 struct proc *p, *pick;
08f2f1bb 2323 struct lwp *lp;
fde7ac71 2324 struct rusage ru;
984263bc
MD
2325 int tmp;
2326
2327 if (ttycheckoutq(tp,0) == 0)
2328 return;
2329
5daa25b0
MD
2330 /*
2331 * We always print the load average, then figure out what else to
2332 * print based on the state of the current process group.
2333 */
984263bc
MD
2334 tmp = (averunnable.ldavg[0] * 100 + FSCALE / 2) >> FSHIFT;
2335 ttyprintf(tp, "load: %d.%02d ", tmp / 100, tmp % 100);
2336
5daa25b0 2337 if (tp->t_session == NULL) {
984263bc 2338 ttyprintf(tp, "not a controlling terminal\n");
5daa25b0 2339 } else if (tp->t_pgrp == NULL) {
984263bc 2340 ttyprintf(tp, "no foreground process group\n");
5daa25b0 2341 } else if ((p = LIST_FIRST(&tp->t_pgrp->pg_members)) == 0) {
984263bc 2342 ttyprintf(tp, "empty foreground process group\n");
5daa25b0 2343 } else {
8dda877a 2344 /*
5daa25b0
MD
2345 * Pick an interesting process. Note that certain elements,
2346 * in particular the wmesg, require a critical section for
2347 * safe access (YYY and we are still not MP safe).
8dda877a 2348 *
08f2f1bb 2349 * NOTE: lwp_wmesg is lwp_thread->td_wmesg.
8dda877a 2350 */
5daa25b0 2351 char buf[64];
8dda877a 2352 const char *str;
5daa25b0
MD
2353 long vmsz;
2354 int pctcpu;
8dda877a
MD
2355
2356 crit_enter();
5daa25b0 2357
bb3cd951
SS
2358 /* XXX lwp should compare lwps */
2359
8dda877a 2360 for (pick = NULL; p != 0; p = LIST_NEXT(p, p_pglist)) {
984263bc
MD
2361 if (proc_compare(pick, p))
2362 pick = p;
8dda877a 2363 }
5daa25b0 2364
08f2f1bb
SS
2365 /* XXX lwp */
2366 lp = FIRST_LWP_IN_PROC(pick);
2367 if (lp == NULL) {
2368 ttyprintf(tp, "foreground process without lwp\n");
2369 tp->t_rocount = 0;
62c46e45 2370 crit_exit();
08f2f1bb
SS
2371 return;
2372 }
2373
5daa25b0
MD
2374 /*
2375 * Figure out what wait/process-state message, and command
2376 * buffer to present
2377 */
08f2f1bb
SS
2378 /*
2379 * XXX lwp This is a horrible mixture. We need to rework this
2380 * as soon as lwps have their own runnable status.
2381 */
bb3cd951 2382 if (pick->p_flag & P_WEXIT)
8dda877a 2383 str = "exiting";
164b8401 2384 else if (lp->lwp_stat == LSRUN)
8dda877a 2385 str = "running";
bb3cd951
SS
2386 else if (pick->p_stat == SIDL)
2387 str = "spawning";
08f2f1bb
SS
2388 else if (lp->lwp_wmesg) /* lwp_thread must not be NULL */
2389 str = lp->lwp_wmesg;
8dda877a
MD
2390 else
2391 str = "iowait";
984263bc 2392
f8c7a42d 2393 ksnprintf(buf, sizeof(buf), "cmd: %s %d [%s]",
bb3cd951 2394 pick->p_comm, pick->p_pid, str);
984263bc 2395
5daa25b0
MD
2396 /*
2397 * Calculate cpu usage, percent cpu, and cmsz. Note that
2398 * 'pick' becomes invalid the moment we exit the critical
2399 * section.
2400 */
ce0d8a70 2401 if (lp->lwp_thread && (pick->p_flag & P_SWAPPEDOUT) == 0)
fde7ac71 2402 calcru_proc(pick, &ru);
984263bc 2403
08f2f1bb 2404 pctcpu = (lp->lwp_pctcpu * 10000 + FSCALE / 2) >> FSHIFT;
5daa25b0 2405
416d05d7 2406 if (pick->p_stat == SIDL || pick->p_stat == SZOMB)
5daa25b0
MD
2407 vmsz = 0;
2408 else
2409 vmsz = pgtok(vmspace_resident_count(pick->p_vmspace));
2410
2411 crit_exit();
984263bc 2412
5daa25b0
MD
2413 /*
2414 * Dump the output
2415 */
2416 ttyprintf(tp, " %s ", buf);
fde7ac71
SS
2417 ttyprintf(tp, "%ld.%02ldu ",
2418 ru.ru_utime.tv_sec, ru.ru_utime.tv_usec / 10000);
2419 ttyprintf(tp, "%ld.%02lds ",
2420 ru.ru_stime.tv_sec, ru.ru_stime.tv_usec / 10000);
5daa25b0 2421 ttyprintf(tp, "%d%% %ldk\n", pctcpu / 100, vmsz);
984263bc
MD
2422 }
2423 tp->t_rocount = 0; /* so pending input will be retyped if BS */
2424}
2425
2426/*
2427 * Returns 1 if p2 is "better" than p1
2428 *
2429 * The algorithm for picking the "interesting" process is thus:
2430 *
2431 * 1) Only foreground processes are eligible - implied.
2432 * 2) Runnable processes are favored over anything else. The runner
dcc99b62 2433 * with the highest cpu utilization is picked (p_cpticks). Ties are
984263bc
MD
2434 * broken by picking the highest pid.
2435 * 3) The sleeper with the shortest sleep time is next. With ties,
9a379a4a 2436 * we pick out just "short-term" sleepers (LWP_SINTR == 0).
984263bc
MD
2437 * 4) Further ties are broken by picking the highest pid.
2438 */
164b8401 2439#define ISRUN(lp) ((lp)->lwp_stat == LSRUN)
984263bc
MD
2440#define TESTAB(a, b) ((a)<<1 | (b))
2441#define ONLYA 2
2442#define ONLYB 1
2443#define BOTH 3
2444
2445static int
c972a82f 2446proc_compare(struct proc *p1, struct proc *p2)
984263bc 2447{
08f2f1bb 2448 struct lwp *lp1, *lp2;
984263bc
MD
2449 if (p1 == NULL)
2450 return (1);
08f2f1bb 2451
93e5e2ea
MD
2452 /*
2453 * weed out zombies
2454 */
2455 switch (TESTAB(p1->p_stat == SZOMB, p2->p_stat == SZOMB)) {
2456 case ONLYA:
2457 return (1);
2458 case ONLYB:
2459 return (0);
2460 case BOTH:
2461 return (p2->p_pid > p1->p_pid); /* tie - return highest pid */
2462 }
2463
08f2f1bb
SS
2464 /* XXX lwp */
2465 lp1 = FIRST_LWP_IN_PROC(p1);
2466 lp2 = FIRST_LWP_IN_PROC(p2);
2467
984263bc
MD
2468 /*
2469 * see if at least one of them is runnable
2470 */
164b8401 2471 switch (TESTAB(ISRUN(lp1), ISRUN(lp2))) {
984263bc
MD
2472 case ONLYA:
2473 return (0);
2474 case ONLYB:
2475 return (1);
2476 case BOTH:
2477 /*
2478 * tie - favor one with highest recent cpu utilization
2479 */
08f2f1bb 2480 if (lp2->lwp_cpticks > lp1->lwp_cpticks)
984263bc 2481 return (1);
08f2f1bb 2482 if (lp1->lwp_cpticks > lp2->lwp_cpticks)
984263bc
MD
2483 return (0);
2484 return (p2->p_pid > p1->p_pid); /* tie - return highest pid */
2485 }
2486 /*
984263bc
MD
2487 * pick the one with the smallest sleep time
2488 */
08f2f1bb 2489 if (lp2->lwp_slptime > lp1->lwp_slptime)
984263bc 2490 return (0);
08f2f1bb 2491 if (lp1->lwp_slptime > lp2->lwp_slptime)
984263bc
MD
2492 return (1);
2493 /*
2494 * favor one sleeping in a non-interruptible sleep
2495 */
9a379a4a 2496 if (lp1->lwp_flag & LWP_SINTR && (lp2->lwp_flag & LWP_SINTR) == 0)
984263bc 2497 return (1);
9a379a4a 2498 if (lp2->lwp_flag & LWP_SINTR && (lp1->lwp_flag & LWP_SINTR) == 0)
984263bc
MD
2499 return (0);
2500 return (p2->p_pid > p1->p_pid); /* tie - return highest pid */
2501}
2502
2503/*
2504 * Output char to tty; console putchar style.
2505 */
2506int
c972a82f 2507tputchar(int c, struct tty *tp)
984263bc 2508{
e43a034f 2509 crit_enter();
984263bc 2510 if (!ISSET(tp->t_state, TS_CONNECTED)) {
e43a034f 2511 crit_exit();
984263bc
MD
2512 return (-1);
2513 }
2514 if (c == '\n')
2515 (void)ttyoutput('\r', tp);
2516 (void)ttyoutput(c, tp);
2517 ttstart(tp);
e43a034f 2518 crit_exit();
984263bc
MD
2519 return (0);
2520}
2521
2522/*
2523 * Sleep on chan, returning ERESTART if tty changed while we napped and
2524 * returning any errors (e.g. EINTR/EWOULDBLOCK) reported by tsleep. If
2525 * the tty is revoked, restarting a pending call will redo validation done
2526 * at the start of the call.
2527 */
2528int
c972a82f 2529ttysleep(struct tty *tp, void *chan, int slpflags, char *wmesg, int timo)
984263bc
MD
2530{
2531 int error;
2532 int gen;
2533
2534 gen = tp->t_gen;
377d4740 2535 error = tsleep(chan, slpflags, wmesg, timo);
984263bc
MD
2536 if (error)
2537 return (error);
2538 return (tp->t_gen == gen ? 0 : ERESTART);
2539}
2540
2541/*
a32446b7
MD
2542 * Revoke a tty.
2543 *
2544 * We bump the gen to force any ttysleep()'s to return with ERESTART
2545 * and flush the tty. The related fp's should already have been
2546 * replaced so the tty will close when the last references on the
2547 * original fp's go away.
2548 */
2549int
2550ttyrevoke(struct dev_revoke_args *ap)
2551{
2552 struct tty *tp;
2553
2554 tp = ap->a_head.a_dev->si_tty;
2555 tp->t_gen++;
2556 ttyflush(tp, FREAD | FWRITE);
2557 wakeup(TSA_CARR_ON(tp));
2558 ttwakeup(tp);
2559 ttwwakeup(tp);
2560 return (0);
2561}
2562
2563/*
984263bc
MD
2564 * Allocate a tty struct. Clists in the struct will be allocated by
2565 * ttyopen().
2566 */
2567struct tty *
c972a82f 2568ttymalloc(struct tty *tp)
984263bc
MD
2569{
2570
cd29885a 2571 if (tp) {
984263bc 2572 return(tp);
cd29885a
MD
2573 }
2574 tp = kmalloc(sizeof *tp, M_TTYS, M_WAITOK|M_ZERO);
984263bc
MD
2575 ttyregister(tp);
2576 return (tp);
2577}
2578
984263bc 2579void
ddac2002 2580ttyunregister(struct tty *tp)
984263bc 2581{
ddac2002
MD
2582 KKASSERT(ISSET(tp->t_state, TS_REGISTERED));
2583 CLR(tp->t_state, TS_REGISTERED);
2584 TAILQ_REMOVE(&tty_list, tp, t_list);
984263bc 2585}
984263bc
MD
2586
2587void
c972a82f 2588ttyregister(struct tty *tp)
984263bc 2589{
ddac2002
MD
2590 KKASSERT(!ISSET(tp->t_state, TS_REGISTERED));
2591 SET(tp->t_state, TS_REGISTERED);
2592 TAILQ_INSERT_HEAD(&tty_list, tp, t_list);
984263bc
MD
2593}
2594
2595static int
2596sysctl_kern_ttys(SYSCTL_HANDLER_ARGS)
2597{
2598 int error;
ddac2002
MD
2599 struct tty *tp;
2600 struct tty t;
2601 struct tty marker;
2602
2603 bzero(&marker, sizeof(marker));
2604 marker.t_state = TS_MARKER;
2605 error = 0;
2606
2607 TAILQ_INSERT_HEAD(&tty_list, &marker, t_list);
2608 while ((tp = TAILQ_NEXT(&marker, t_list)) != NULL) {
2609 TAILQ_REMOVE(&tty_list, &marker, t_list);
2610 TAILQ_INSERT_AFTER(&tty_list, tp, &marker, t_list);
2611 if (tp->t_state & TS_MARKER)
2612 continue;
984263bc
MD
2613 t = *tp;
2614 if (t.t_dev)
973c11b9 2615 t.t_dev = (cdev_t)(uintptr_t)dev2udev(t.t_dev);
984263bc
MD
2616 error = SYSCTL_OUT(req, (caddr_t)&t, sizeof(t));
2617 if (error)
ddac2002 2618 break;
984263bc 2619 }
ddac2002
MD
2620 TAILQ_REMOVE(&tty_list, &marker, t_list);
2621 return (error);
984263bc
MD
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
c972a82f 2628nottystop(struct tty *tp, int rw)
984263bc
MD
2629{
2630
2631 return;
2632}
2633
2634int
fef8985e 2635ttyread(struct dev_read_args *ap)
984263bc
MD
2636{
2637 struct tty *tp;
2638
fef8985e 2639 tp = ap->a_head.a_dev->si_tty;
984263bc
MD
2640 if (tp == NULL)
2641 return (ENODEV);
fef8985e 2642 return ((*linesw[tp->t_line].l_read)(tp, ap->a_uio, ap->a_ioflag));
984263bc
MD
2643}
2644
2645int
fef8985e 2646ttywrite(struct dev_write_args *ap)
984263bc
MD
2647{
2648 struct tty *tp;
2649
fef8985e 2650 tp = ap->a_head.a_dev->si_tty;
984263bc
MD
2651 if (tp == NULL)
2652 return (ENODEV);
fef8985e 2653 return ((*linesw[tp->t_line].l_write)(tp, ap->a_uio, ap->a_ioflag));
984263bc 2654}