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i386 removal, part 65/x: Remove some leftovers in kernel.
[dragonfly.git] / sys / kern / tty.c
blobd6f1f78f561053168d56ee1e477c2adbd2a7c3ec
1 /*-
2 * (MPSAFE)
3 *
4 * Copyright (c) 1982, 1986, 1990, 1991, 1993
5 * The Regents of the University of California. All rights reserved.
6 * (c) UNIX System Laboratories, Inc.
7 * All or some portions of this file are derived from material licensed
8 * to the University of California by American Telephone and Telegraph
9 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
10 * the permission of UNIX System Laboratories, Inc.
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 * 1. Redistributions of source code must retain the above copyright
16 * notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 * notice, this list of conditions and the following disclaimer in the
19 * documentation and/or other materials provided with the distribution.
20 * 3. Neither the name of the University nor the names of its contributors
21 * may be used to endorse or promote products derived from this software
22 * without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 *
36 * @(#)tty.c 8.8 (Berkeley) 1/21/94
37 * $FreeBSD: src/sys/kern/tty.c,v 1.129.2.5 2002/03/11 01:32:31 dd Exp $
38 */
39
40 /*
41 * MPSAFE NOTE:
42 * Almost all functions in this file are acquiring the tty token due to their
43 * access and modifications of the 'tp' (struct tty) objects.
44 */
45
46 /*-
47 * TODO:
48 * o Fix races for sending the start char in ttyflush().
49 * o Handle inter-byte timeout for "MIN > 0, TIME > 0" in ttyselect().
50 * With luck, there will be MIN chars before select() returns().
51 * o Handle CLOCAL consistently for ptys. Perhaps disallow setting it.
52 * o Don't allow input in TS_ZOMBIE case. It would be visible through
53 * FIONREAD.
54 * o Do the new sio locking stuff here and use it to avoid special
55 * case for EXTPROC?
56 * o Lock PENDIN too?
57 * o Move EXTPROC and/or PENDIN to t_state?
58 * o Wrap most of ttioctl in spltty/splx.
59 * o Implement TIOCNOTTY or remove it from <sys/ioctl.h>.
60 * o Send STOP if IXOFF is toggled off while TS_TBLOCK is set.
61 * o Don't allow certain termios flags to affect disciplines other
62 * than TTYDISC. Cancel their effects before switch disciplines
63 * and ignore them if they are set while we are in another
64 * discipline.
65 * o Now that historical speed conversions are handled here, don't
66 * do them in drivers.
67 * o Check for TS_CARR_ON being set while everything is closed and not
68 * waiting for carrier. TS_CARR_ON isn't cleared if nothing is open,
69 * so it would live until the next open even if carrier drops.
70 * o Restore TS_WOPEN since it is useful in pstat. It must be cleared
71 * only when _all_ openers leave open().
72 */
73
74 #include "opt_uconsole.h"
75
76 #include <sys/param.h>
77 #include <sys/systm.h>
78 #include <sys/filio.h>
79 #include <sys/proc.h>
80 #include <sys/priv.h>
81 #define TTYDEFCHARS
82 #include <sys/tty.h>
83 #include <sys/clist.h>
84 #undef TTYDEFCHARS
85 #include <sys/fcntl.h>
86 #include <sys/conf.h>
87 #include <sys/dkstat.h>
88 #include <sys/kernel.h>
89 #include <sys/vnode.h>
90 #include <sys/signalvar.h>
91 #include <sys/signal2.h>
92 #include <sys/resourcevar.h>
93 #include <sys/malloc.h>
94 #include <sys/filedesc.h>
95 #include <sys/sysctl.h>
96 #include <sys/thread2.h>
97
98 #include <vm/vm.h>
99 #include <sys/lock.h>
100 #include <vm/pmap.h>
101 #include <vm/vm_map.h>
102 #include <vm/vm_extern.h>
103
104 MALLOC_DEFINE(M_TTYS, "ttys", "tty data structures");
105
106 static int proc_compare (struct proc *p1, struct proc *p2);
107 static int ttnread (struct tty *tp);
108 static void ttyecho (int c, struct tty *tp);
109 static int ttyoutput (int c, struct tty *tp);
110 static void ttypend (struct tty *tp);
111 static void ttyretype (struct tty *tp);
112 static void ttyrub (int c, struct tty *tp);
113 static void ttyrubo (struct tty *tp, int cnt);
114 static void ttyunblock (struct tty *tp);
115 static int ttywflush (struct tty *tp);
116 static int filt_ttyread (struct knote *kn, long hint);
117 static void filt_ttyrdetach (struct knote *kn);
118 static int filt_ttywrite (struct knote *kn, long hint);
119 static void filt_ttywdetach (struct knote *kn);
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
147 static 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
202 uint64_t tk_nin;
203 SYSCTL_OPAQUE(_kern, OID_AUTO, tk_nin, CTLFLAG_RD, &tk_nin, sizeof(tk_nin),
204 "LU", "TTY input statistic");
205 uint64_t tk_nout;
206 SYSCTL_OPAQUE(_kern, OID_AUTO, tk_nout, CTLFLAG_RD, &tk_nout, sizeof(tk_nout),
207 "LU", "TTY output statistic");
208 uint64_t tk_rawcc;
209
210 /*
211 * list of struct tty where pstat(8) can pick it up with sysctl
212 */
213 static TAILQ_HEAD(, tty) tty_list = TAILQ_HEAD_INITIALIZER(tty_list);
214
215 /*
216 * Initial open of tty, or (re)entry to standard tty line discipline.
217 */
218 int
219 ttyopen(cdev_t device, struct tty *tp)
220 {
221 crit_enter();
222 lwkt_gettoken(&tty_token);
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 }
229 bzero(&tp->t_winsize, sizeof(tp->t_winsize));
230 }
231 ttsetwater(tp);
232 lwkt_reltoken(&tty_token);
233 crit_exit();
234 return (0);
235 }
236
237 /*
238 * Handle close() on a tty line: flush and set to initial state,
239 * bumping generation number so that pending read/write calls
240 * can detect recycling of the tty.
241 *
242 * XXX our caller should have done `spltty(); l_close(); ttyclose();'
243 * and l_close() should have flushed, but we repeat the spltty() and
244 * the flush in case there are buggy callers.
245 */
246 int
247 ttyclose(struct tty *tp)
248 {
249 crit_enter();
250 lwkt_gettoken(&tty_token);
251 funsetown(&tp->t_sigio);
252 if (constty == tp)
253 constty = NULL;
254
255 ttyflush(tp, FREAD | FWRITE);
256 clist_free_cblocks(&tp->t_canq);
257 clist_free_cblocks(&tp->t_outq);
258 clist_free_cblocks(&tp->t_rawq);
259
260 tp->t_gen++;
261 tp->t_line = TTYDISC;
262 ttyclearsession(tp);
263 tp->t_state &= TS_REGISTERED; /* clear all bits except */
264 lwkt_reltoken(&tty_token);
265 crit_exit();
266 return (0);
267 }
268
269 /*
270 * Disassociate the tty from its session. Traditionally this has only been
271 * a half-close, meaning that the session was still allowed to point at the
272 * tty (resulting in the tty in the ps command showing something like 'p0-'),
273 * even though the tty is no longer pointing at the session.
274 *
275 * The half close seems to be useful only for 'ps' output but there is as
276 * yet no reason to remove the feature. The full-close code is currently
277 * #if 0'd out. See also sess_rele() in kern/kern_proc.c.
278 */
279 void
280 ttyclearsession(struct tty *tp)
281 {
282 struct session *sp;
283 struct pgrp *opgrp;
284
285 lwkt_gettoken(&tty_token);
286 opgrp = tp->t_pgrp;
287 tp->t_pgrp = NULL;
288 if (opgrp) {
289 pgrel(opgrp);
290 opgrp = NULL;
291 }
292
293 if ((sp = tp->t_session) != NULL) {
294 tp->t_session = NULL;
295 #ifdef TTY_DO_FULL_CLOSE
296 /* FULL CLOSE (not yet) */
297 if (sp->s_ttyp == tp) {
298 sp->s_ttyp = NULL;
299 ttyunhold(tp);
300 } else {
301 kprintf("ttyclearsession: warning: sp->s_ttyp != tp "
302 "%p/%p\n", sp->s_ttyp, tp);
303 }
304 #endif
305 }
306 lwkt_reltoken(&tty_token);
307 }
308
309 /*
310 * Release the tty vnode association for a session. This is the
311 * 'other half' of the close. Because multiple opens of /dev/tty
312 * only generate a single open to the actual tty, the file modes
313 * are locked to FREAD|FWRITE.
314 *
315 * If dorevoke is non-zero, the session is also revoked. We have to
316 * close the vnode if VCTTYISOPEN is set.
317 */
318 void
319 ttyclosesession(struct session *sp, int dorevoke)
320 {
321 struct vnode *vp;
322
323 lwkt_gettoken(&tty_token);
324 retry:
325 /*
326 * There may not be a controlling terminal or it may have been closed
327 * out from under us.
328 */
329 if ((vp = sp->s_ttyvp) == NULL) {
330 lwkt_reltoken(&tty_token);
331 return;
332 }
333
334 /*
335 * We need a lock if we have to close or revoke.
336 */
337 if ((vp->v_flag & VCTTYISOPEN) || dorevoke) {
338 vhold(vp);
339 if (vn_lock(vp, LK_EXCLUSIVE | LK_RETRY | LK_FAILRECLAIM)) {
340 vdrop(vp);
341 goto retry;
342 }
343
344 /*
345 * Retry if the vnode was ripped out from under us
346 */
347 if (vp != sp->s_ttyvp) {
348 vn_unlock(vp);
349 vdrop(vp);
350 goto retry;
351 }
352
353 /*
354 * Close and revoke as needed
355 */
356 sp->s_ttyvp = NULL;
357 if (vp->v_flag & VCTTYISOPEN) {
358 vclrflags(vp, VCTTYISOPEN);
359 VOP_CLOSE(vp, FREAD|FWRITE, NULL);
360 }
361 vn_unlock(vp);
362 if (dorevoke)
363 vrevoke(vp, proc0.p_ucred);
364 vdrop(vp);
365 } else {
366 sp->s_ttyvp = NULL;
367 }
368 vrele(vp);
369 lwkt_reltoken(&tty_token);
370 }
371
372 #define FLUSHQ(q) { \
373 if ((q)->c_cc) \
374 ndflush(q, (q)->c_cc); \
375 }
376
377 /* Is 'c' a line delimiter ("break" character)? */
378 #define TTBREAKC(c, lflag) \
379 ((c) == '\n' || (((c) == cc[VEOF] || \
380 (c) == cc[VEOL] || ((c) == cc[VEOL2] && lflag & IEXTEN)) && \
381 (c) != _POSIX_VDISABLE))
382
383 /*
384 * Process input of a single character received on a tty.
385 */
386 int
387 ttyinput(int c, struct tty *tp)
388 {
389 tcflag_t iflag, lflag;
390 cc_t *cc;
391 int i, err;
392
393 lwkt_gettoken(&tty_token);
394 /*
395 * If input is pending take it first.
396 */
397 lflag = tp->t_lflag;
398 if (ISSET(lflag, PENDIN))
399 ttypend(tp);
400 /*
401 * Gather stats.
402 */
403 if (ISSET(lflag, ICANON))
404 ++tp->t_cancc;
405 else
406 ++tp->t_rawcc;
407 ++tk_nin;
408
409 /*
410 * Block further input iff:
411 * current input > threshold AND input is available to user program
412 * AND input flow control is enabled and not yet invoked.
413 * The 3 is slop for PARMRK.
414 */
415 iflag = tp->t_iflag;
416 if (tp->t_rawq.c_cc + tp->t_canq.c_cc > tp->t_ihiwat - 3 &&
417 (!ISSET(lflag, ICANON) || tp->t_canq.c_cc != 0) &&
418 (ISSET(tp->t_cflag, CRTS_IFLOW) || ISSET(iflag, IXOFF)) &&
419 !ISSET(tp->t_state, TS_TBLOCK))
420 ttyblock(tp);
421
422 /* Handle exceptional conditions (break, parity, framing). */
423 cc = tp->t_cc;
424 err = (ISSET(c, TTY_ERRORMASK));
425 if (err) {
426 CLR(c, TTY_ERRORMASK);
427 if (ISSET(err, TTY_BI)) {
428 if (ISSET(iflag, IGNBRK)) {
429 lwkt_reltoken(&tty_token);
430 return (0);
431 }
432 if (ISSET(iflag, BRKINT)) {
433 ttyflush(tp, FREAD | FWRITE);
434 pgsignal(tp->t_pgrp, SIGINT, 1);
435 goto endcase;
436 }
437 if (ISSET(iflag, PARMRK))
438 goto parmrk;
439 } else if ((ISSET(err, TTY_PE) && ISSET(iflag, INPCK))
440 || ISSET(err, TTY_FE)) {
441 if (ISSET(iflag, IGNPAR)) {
442 lwkt_reltoken(&tty_token);
443 return (0);
444 }
445 else if (ISSET(iflag, PARMRK)) {
446 parmrk:
447 if (tp->t_rawq.c_cc + tp->t_canq.c_cc >
448 MAX_INPUT - 3)
449 goto input_overflow;
450 clist_putc(0377 | TTY_QUOTE, &tp->t_rawq);
451 clist_putc(0 | TTY_QUOTE, &tp->t_rawq);
452 clist_putc(c | TTY_QUOTE, &tp->t_rawq);
453 goto endcase;
454 } else
455 c = 0;
456 }
457 }
458
459 if (!ISSET(tp->t_state, TS_TYPEN) && ISSET(iflag, ISTRIP))
460 CLR(c, 0x80);
461 if (!ISSET(lflag, EXTPROC)) {
462 /*
463 * Check for literal nexting very first
464 */
465 if (ISSET(tp->t_state, TS_LNCH)) {
466 SET(c, TTY_QUOTE);
467 CLR(tp->t_state, TS_LNCH);
468 }
469 /*
470 * Scan for special characters. This code
471 * is really just a big case statement with
472 * non-constant cases. The bottom of the
473 * case statement is labeled ``endcase'', so goto
474 * it after a case match, or similar.
475 */
476
477 /*
478 * Control chars which aren't controlled
479 * by ICANON, ISIG, or IXON.
480 */
481 if (ISSET(lflag, IEXTEN)) {
482 if (CCEQ(cc[VLNEXT], c)) {
483 if (ISSET(lflag, ECHO)) {
484 if (ISSET(lflag, ECHOE)) {
485 (void)ttyoutput('^', tp);
486 (void)ttyoutput('\b', tp);
487 } else
488 ttyecho(c, tp);
489 }
490 SET(tp->t_state, TS_LNCH);
491 goto endcase;
492 }
493 if (CCEQ(cc[VDISCARD], c)) {
494 if (ISSET(lflag, FLUSHO))
495 CLR(tp->t_lflag, FLUSHO);
496 else {
497 ttyflush(tp, FWRITE);
498 ttyecho(c, tp);
499 if (tp->t_rawq.c_cc + tp->t_canq.c_cc)
500 ttyretype(tp);
501 SET(tp->t_lflag, FLUSHO);
502 }
503 goto startoutput;
504 }
505 }
506 /*
507 * Signals.
508 */
509 if (ISSET(lflag, ISIG)) {
510 if (CCEQ(cc[VINTR], c) || CCEQ(cc[VQUIT], c)) {
511 if (!ISSET(lflag, NOFLSH))
512 ttyflush(tp, FREAD | FWRITE);
513 ttyecho(c, tp);
514 pgsignal(tp->t_pgrp,
515 CCEQ(cc[VINTR], c) ? SIGINT : SIGQUIT, 1);
516 goto endcase;
517 }
518 if (CCEQ(cc[VSUSP], c)) {
519 if (!ISSET(lflag, NOFLSH))
520 ttyflush(tp, FREAD);
521 ttyecho(c, tp);
522 pgsignal(tp->t_pgrp, SIGTSTP, 1);
523 goto endcase;
524 }
525 }
526 /*
527 * Handle start/stop characters.
528 */
529 if (ISSET(iflag, IXON)) {
530 if (CCEQ(cc[VSTOP], c)) {
531 if (!ISSET(tp->t_state, TS_TTSTOP)) {
532 SET(tp->t_state, TS_TTSTOP);
533 (*tp->t_stop)(tp, 0);
534 lwkt_reltoken(&tty_token);
535 return (0);
536 }
537 if (!CCEQ(cc[VSTART], c)) {
538 lwkt_reltoken(&tty_token);
539 return (0);
540 }
541 /*
542 * if VSTART == VSTOP then toggle
543 */
544 goto endcase;
545 }
546 if (CCEQ(cc[VSTART], c))
547 goto restartoutput;
548 }
549 /*
550 * IGNCR, ICRNL, & INLCR
551 */
552 if (c == '\r') {
553 if (ISSET(iflag, IGNCR)) {
554 lwkt_reltoken(&tty_token);
555 return (0);
556 }
557 else if (ISSET(iflag, ICRNL))
558 c = '\n';
559 } else if (c == '\n' && ISSET(iflag, INLCR))
560 c = '\r';
561 }
562 if (!ISSET(tp->t_lflag, EXTPROC) && ISSET(lflag, ICANON)) {
563 /*
564 * From here on down canonical mode character
565 * processing takes place.
566 */
567 /*
568 * erase or erase2 (^H / ^?)
569 */
570 if (CCEQ(cc[VERASE], c) || CCEQ(cc[VERASE2], c) ) {
571 if (tp->t_rawq.c_cc)
572 ttyrub(clist_unputc(&tp->t_rawq), tp);
573 goto endcase;
574 }
575 /*
576 * kill (^U)
577 */
578 if (CCEQ(cc[VKILL], c)) {
579 if (ISSET(lflag, ECHOKE) &&
580 tp->t_rawq.c_cc == tp->t_rocount &&
581 !ISSET(lflag, ECHOPRT))
582 while (tp->t_rawq.c_cc)
583 ttyrub(clist_unputc(&tp->t_rawq), tp);
584 else {
585 ttyecho(c, tp);
586 if (ISSET(lflag, ECHOK) ||
587 ISSET(lflag, ECHOKE))
588 ttyecho('\n', tp);
589 FLUSHQ(&tp->t_rawq);
590 tp->t_rocount = 0;
591 }
592 CLR(tp->t_state, TS_LOCAL);
593 goto endcase;
594 }
595 /*
596 * word erase (^W)
597 */
598 if (CCEQ(cc[VWERASE], c) && ISSET(lflag, IEXTEN)) {
599 int ctype;
600
601 /*
602 * erase whitespace
603 */
604 while ((c = clist_unputc(&tp->t_rawq)) == ' ' || c == '\t')
605 ttyrub(c, tp);
606 if (c == -1)
607 goto endcase;
608 /*
609 * erase last char of word and remember the
610 * next chars type (for ALTWERASE)
611 */
612 ttyrub(c, tp);
613 c = clist_unputc(&tp->t_rawq);
614 if (c == -1)
615 goto endcase;
616 if (c == ' ' || c == '\t') {
617 clist_putc(c, &tp->t_rawq);
618 goto endcase;
619 }
620 ctype = ISALPHA(c);
621 /*
622 * erase rest of word
623 */
624 do {
625 ttyrub(c, tp);
626 c = clist_unputc(&tp->t_rawq);
627 if (c == -1)
628 goto endcase;
629 } while (c != ' ' && c != '\t' &&
630 (!ISSET(lflag, ALTWERASE) || ISALPHA(c) == ctype));
631 clist_putc(c, &tp->t_rawq);
632 goto endcase;
633 }
634 /*
635 * reprint line (^R)
636 */
637 if (CCEQ(cc[VREPRINT], c) && ISSET(lflag, IEXTEN)) {
638 ttyretype(tp);
639 goto endcase;
640 }
641 /*
642 * ^T - kernel info and generate SIGINFO
643 */
644 if (CCEQ(cc[VSTATUS], c) && ISSET(lflag, IEXTEN)) {
645 if (ISSET(lflag, ISIG))
646 pgsignal(tp->t_pgrp, SIGINFO, 1);
647 if (!ISSET(lflag, NOKERNINFO))
648 ttyinfo(tp);
649 goto endcase;
650 }
651 if (CCEQ(cc[VCHECKPT], c) && ISSET(lflag, IEXTEN)) {
652 if (ISSET(lflag, ISIG))
653 pgsignal(tp->t_pgrp, SIGCKPT, 1);
654 goto endcase;
655 }
656 }
657 /*
658 * Check for input buffer overflow
659 */
660 if (tp->t_rawq.c_cc + tp->t_canq.c_cc >= MAX_INPUT) {
661 input_overflow:
662 if (ISSET(iflag, IMAXBEL)) {
663 if (tp->t_outq.c_cc < tp->t_ohiwat)
664 (void)ttyoutput(CTRL('g'), tp);
665 }
666 goto endcase;
667 }
668
669 if ( c == 0377 && ISSET(iflag, PARMRK) && !ISSET(iflag, ISTRIP)
670 && ISSET(iflag, IGNBRK|IGNPAR) != (IGNBRK|IGNPAR))
671 clist_putc(0377 | TTY_QUOTE, &tp->t_rawq);
672
673 /*
674 * Put data char in q for user and
675 * wakeup on seeing a line delimiter.
676 */
677 if (clist_putc(c, &tp->t_rawq) >= 0) {
678 if (!ISSET(lflag, ICANON)) {
679 ttwakeup(tp);
680 ttyecho(c, tp);
681 goto endcase;
682 }
683 if (TTBREAKC(c, lflag)) {
684 tp->t_rocount = 0;
685 catq(&tp->t_rawq, &tp->t_canq);
686 ttwakeup(tp);
687 } else if (tp->t_rocount++ == 0)
688 tp->t_rocol = tp->t_column;
689 if (ISSET(tp->t_state, TS_ERASE)) {
690 /*
691 * end of prterase \.../
692 */
693 CLR(tp->t_state, TS_ERASE);
694 (void)ttyoutput('/', tp);
695 }
696 i = tp->t_column;
697 ttyecho(c, tp);
698 if (CCEQ(cc[VEOF], c) && ISSET(lflag, ECHO)) {
699 /*
700 * Place the cursor over the '^' of the ^D.
701 */
702 i = imin(2, tp->t_column - i);
703 while (i > 0) {
704 (void)ttyoutput('\b', tp);
705 i--;
706 }
707 }
708 }
709 endcase:
710 /*
711 * IXANY means allow any character to restart output.
712 */
713 if (ISSET(tp->t_state, TS_TTSTOP) &&
714 !ISSET(iflag, IXANY) && cc[VSTART] != cc[VSTOP]) {
715 lwkt_reltoken(&tty_token);
716 return (0);
717 }
718 restartoutput:
719 CLR(tp->t_lflag, FLUSHO);
720 CLR(tp->t_state, TS_TTSTOP);
721 startoutput:
722 lwkt_reltoken(&tty_token);
723 return (ttstart(tp));
724 }
725
726 /*
727 * Output a single character on a tty, doing output processing
728 * as needed (expanding tabs, newline processing, etc.).
729 * Returns < 0 if succeeds, otherwise returns char to resend.
730 * Must be recursive.
731 */
732 static int
733 ttyoutput(int c, struct tty *tp)
734 {
735 tcflag_t oflag;
736 int col;
737
738 lwkt_gettoken(&tty_token);
739 oflag = tp->t_oflag;
740 if (!ISSET(oflag, OPOST)) {
741 if (ISSET(tp->t_lflag, FLUSHO)) {
742 lwkt_reltoken(&tty_token);
743 return (-1);
744 }
745 if (clist_putc(c, &tp->t_outq)) {
746 lwkt_reltoken(&tty_token);
747 return (c);
748 }
749 tk_nout++;
750 tp->t_outcc++;
751 lwkt_reltoken(&tty_token);
752 return (-1);
753 }
754 /*
755 * Do tab expansion if OXTABS is set. Special case if we external
756 * processing, we don't do the tab expansion because we'll probably
757 * get it wrong. If tab expansion needs to be done, let it happen
758 * externally.
759 */
760 CLR(c, ~TTY_CHARMASK);
761 if (c == '\t' &&
762 ISSET(oflag, OXTABS) && !ISSET(tp->t_lflag, EXTPROC)) {
763 c = 8 - (tp->t_column & 7);
764 if (!ISSET(tp->t_lflag, FLUSHO)) {
765 crit_enter(); /* Don't interrupt tabs. */
766 c -= b_to_q(" ", c, &tp->t_outq);
767 tk_nout += c;
768 tp->t_outcc += c;
769 crit_exit();
770 }
771 tp->t_column += c;
772 lwkt_reltoken(&tty_token);
773 return (c ? -1 : '\t');
774 }
775 if (c == CEOT && ISSET(oflag, ONOEOT)) {
776 lwkt_reltoken(&tty_token);
777 return (-1);
778 }
779
780 /*
781 * Newline translation: if ONLCR is set,
782 * translate newline into "\r\n".
783 */
784 if (c == '\n' && ISSET(tp->t_oflag, ONLCR)) {
785 tk_nout++;
786 tp->t_outcc++;
787 if (!ISSET(tp->t_lflag, FLUSHO) && clist_putc('\r', &tp->t_outq)) {
788 lwkt_reltoken(&tty_token);
789 return (c);
790 }
791 }
792 /* If OCRNL is set, translate "\r" into "\n". */
793 else if (c == '\r' && ISSET(tp->t_oflag, OCRNL))
794 c = '\n';
795 /* If ONOCR is set, don't transmit CRs when on column 0. */
796 else if (c == '\r' && ISSET(tp->t_oflag, ONOCR) && tp->t_column == 0) {
797 lwkt_reltoken(&tty_token);
798 return (-1);
799 }
800
801 tk_nout++;
802 tp->t_outcc++;
803 if (!ISSET(tp->t_lflag, FLUSHO) && clist_putc(c, &tp->t_outq)) {
804 lwkt_reltoken(&tty_token);
805 return (c);
806 }
807
808 col = tp->t_column;
809 switch (CCLASS(c)) {
810 case BACKSPACE:
811 if (col > 0)
812 --col;
813 break;
814 case CONTROL:
815 break;
816 case NEWLINE:
817 if (ISSET(tp->t_oflag, ONLCR | ONLRET))
818 col = 0;
819 break;
820 case RETURN:
821 col = 0;
822 break;
823 case ORDINARY:
824 ++col;
825 break;
826 case TAB:
827 col = (col + 8) & ~7;
828 break;
829 }
830 tp->t_column = col;
831 lwkt_reltoken(&tty_token);
832 return (-1);
833 }
834
835 /*
836 * Ioctls for all tty devices. Called after line-discipline specific ioctl
837 * has been called to do discipline-specific functions and/or reject any
838 * of these ioctl commands.
839 */
840 /* ARGSUSED */
841 int
842 ttioctl(struct tty *tp, u_long cmd, void *data, int flag)
843 {
844 struct thread *td = curthread;
845 struct lwp *lp = td->td_lwp;
846 struct proc *p = td->td_proc;
847 struct pgrp *opgrp;
848 struct tty *otp;
849 int error;
850
851 KKASSERT(p);
852 lwkt_gettoken(&tty_token);
853 lwkt_gettoken(&p->p_token);
854
855 /* If the ioctl involves modification, hang if in the background. */
856 switch (cmd) {
857 case TIOCCBRK:
858 case TIOCCONS:
859 case TIOCDRAIN:
860 case TIOCEXCL:
861 case TIOCFLUSH:
862 #ifdef TIOCHPCL
863 case TIOCHPCL:
864 #endif
865 case TIOCNXCL:
866 case TIOCSBRK:
867 case TIOCSCTTY:
868 case TIOCSDRAINWAIT:
869 case TIOCSETA:
870 case TIOCSETAF:
871 case TIOCSETAW:
872 case TIOCSETD:
873 case TIOCSPGRP:
874 case TIOCSTART:
875 case TIOCSTAT:
876 case TIOCSTI:
877 case TIOCSTOP:
878 case TIOCSWINSZ:
879 while (isbackground(p, tp) && !(p->p_flags & P_PPWAIT) &&
880 !SIGISMEMBER(p->p_sigignore, SIGTTOU) &&
881 !SIGISMEMBER(lp->lwp_sigmask, SIGTTOU)) {
882 if (p->p_pgrp->pg_jobc == 0) {
883 lwkt_reltoken(&p->p_token);
884 lwkt_reltoken(&tty_token);
885 return (EIO);
886 }
887 pgsignal(p->p_pgrp, SIGTTOU, 1);
888 error = ttysleep(tp, &lbolt, PCATCH, "ttybg1",
889 0);
890 if (error) {
891 lwkt_reltoken(&p->p_token);
892 lwkt_reltoken(&tty_token);
893 return (error);
894 }
895 }
896 break;
897 }
898
899 switch (cmd) { /* Process the ioctl. */
900 case FIOASYNC: /* set/clear async i/o */
901 crit_enter();
902 if (*(int *)data)
903 SET(tp->t_state, TS_ASYNC);
904 else
905 CLR(tp->t_state, TS_ASYNC);
906 crit_exit();
907 break;
908 case FIONREAD: /* get # bytes to read */
909 crit_enter();
910 *(int *)data = ttnread(tp);
911 crit_exit();
912 break;
913
914 case FIOSETOWN:
915 /*
916 * Policy -- Don't allow FIOSETOWN on someone else's
917 * controlling tty
918 */
919 if (tp->t_session != NULL && !isctty(p, tp)) {
920 lwkt_reltoken(&p->p_token);
921 lwkt_reltoken(&tty_token);
922 return (ENOTTY);
923 }
924
925 error = fsetown(*(int *)data, &tp->t_sigio);
926 if (error) {
927 lwkt_reltoken(&p->p_token);
928 lwkt_reltoken(&tty_token);
929 return (error);
930 }
931 break;
932 case FIOGETOWN:
933 if (tp->t_session != NULL && !isctty(p, tp)) {
934 lwkt_reltoken(&p->p_token);
935 lwkt_reltoken(&tty_token);
936 return (ENOTTY);
937 }
938 *(int *)data = fgetown(&tp->t_sigio);
939 break;
940
941 case TIOCEXCL: /* set exclusive use of tty */
942 crit_enter();
943 SET(tp->t_state, TS_XCLUDE);
944 crit_exit();
945 break;
946 case TIOCFLUSH: { /* flush buffers */
947 int flags = *(int *)data;
948
949 if (flags == 0)
950 flags = FREAD | FWRITE;
951 else
952 flags &= FREAD | FWRITE;
953 ttyflush(tp, flags);
954 break;
955 }
956 case TIOCCONS: /* become virtual console */
957 if (*(int *)data) {
958 if (constty && constty != tp &&
959 ISSET(constty->t_state, TS_CONNECTED)) {
960 lwkt_reltoken(&p->p_token);
961 lwkt_reltoken(&tty_token);
962 return (EBUSY);
963 }
964 #ifndef UCONSOLE
965 if ((error = priv_check(td, PRIV_ROOT)) != 0) {
966 lwkt_reltoken(&p->p_token);
967 lwkt_reltoken(&tty_token);
968 return (error);
969 }
970 #endif
971 constty = tp;
972 } else if (tp == constty)
973 constty = NULL;
974 break;
975 case TIOCDRAIN: /* wait till output drained */
976 error = ttywait(tp);
977 if (error) {
978 lwkt_reltoken(&p->p_token);
979 lwkt_reltoken(&tty_token);
980 return (error);
981 }
982 break;
983 case TIOCGETA: { /* get termios struct */
984 struct termios *t = (struct termios *)data;
985
986 bcopy(&tp->t_termios, t, sizeof(struct termios));
987 break;
988 }
989 case TIOCGETD: /* get line discipline */
990 *(int *)data = tp->t_line;
991 break;
992 case TIOCGWINSZ: /* get window size */
993 *(struct winsize *)data = tp->t_winsize;
994 break;
995 case TIOCGPGRP: /* get pgrp of tty */
996 if (!isctty(p, tp)) {
997 lwkt_reltoken(&p->p_token);
998 lwkt_reltoken(&tty_token);
999 return (ENOTTY);
1000 }
1001 *(int *)data = tp->t_pgrp ? tp->t_pgrp->pg_id : NO_PID;
1002 break;
1003 case TIOCGSID: /* get sid of tty */
1004 if (!isctty(p, tp)) {
1005 lwkt_reltoken(&p->p_token);
1006 lwkt_reltoken(&tty_token);
1007 return (ENOTTY);
1008 }
1009 *(int *)data = tp->t_session->s_sid;
1010 break;
1011 #ifdef TIOCHPCL
1012 case TIOCHPCL: /* hang up on last close */
1013 crit_enter();
1014 SET(tp->t_cflag, HUPCL);
1015 crit_exit();
1016 break;
1017 #endif
1018 case TIOCNXCL: /* reset exclusive use of tty */
1019 crit_enter();
1020 CLR(tp->t_state, TS_XCLUDE);
1021 crit_exit();
1022 break;
1023 case TIOCOUTQ: /* output queue size */
1024 *(int *)data = tp->t_outq.c_cc;
1025 break;
1026 case TIOCSETA: /* set termios struct */
1027 case TIOCSETAW: /* drain output, set */
1028 case TIOCSETAF: { /* drn out, fls in, set */
1029 struct termios *t = (struct termios *)data;
1030
1031 if (t->c_ispeed == 0)
1032 t->c_ispeed = t->c_ospeed;
1033 if (t->c_ispeed == 0)
1034 t->c_ispeed = tp->t_ospeed;
1035 if (t->c_ispeed == 0) {
1036 lwkt_reltoken(&p->p_token);
1037 lwkt_reltoken(&tty_token);
1038 return (EINVAL);
1039 }
1040 crit_enter();
1041 if (cmd == TIOCSETAW || cmd == TIOCSETAF) {
1042 error = ttywait(tp);
1043 if (error) {
1044 crit_exit();
1045 lwkt_reltoken(&p->p_token);
1046 lwkt_reltoken(&tty_token);
1047 return (error);
1048 }
1049 if (cmd == TIOCSETAF)
1050 ttyflush(tp, FREAD);
1051 }
1052 if (!ISSET(t->c_cflag, CIGNORE)) {
1053 /*
1054 * Set device hardware.
1055 */
1056 if (tp->t_param && (error = (*tp->t_param)(tp, t))) {
1057 crit_exit();
1058 lwkt_reltoken(&p->p_token);
1059 lwkt_reltoken(&tty_token);
1060 return (error);
1061 }
1062 if (ISSET(t->c_cflag, CLOCAL) &&
1063 !ISSET(tp->t_cflag, CLOCAL)) {
1064 /*
1065 * XXX disconnections would be too hard to
1066 * get rid of without this kludge. The only
1067 * way to get rid of controlling terminals
1068 * is to exit from the session leader.
1069 */
1070 CLR(tp->t_state, TS_ZOMBIE);
1071
1072 wakeup(TSA_CARR_ON(tp));
1073 ttwakeup(tp);
1074 ttwwakeup(tp);
1075 }
1076 if ((ISSET(tp->t_state, TS_CARR_ON) ||
1077 ISSET(t->c_cflag, CLOCAL)) &&
1078 !ISSET(tp->t_state, TS_ZOMBIE))
1079 SET(tp->t_state, TS_CONNECTED);
1080 else
1081 CLR(tp->t_state, TS_CONNECTED);
1082 tp->t_cflag = t->c_cflag;
1083 tp->t_ispeed = t->c_ispeed;
1084 if (t->c_ospeed != 0)
1085 tp->t_ospeed = t->c_ospeed;
1086 ttsetwater(tp);
1087 }
1088 if (ISSET(t->c_lflag, ICANON) != ISSET(tp->t_lflag, ICANON) &&
1089 cmd != TIOCSETAF) {
1090 if (ISSET(t->c_lflag, ICANON))
1091 SET(tp->t_lflag, PENDIN);
1092 else {
1093 /*
1094 * XXX we really shouldn't allow toggling
1095 * ICANON while we're in a non-termios line
1096 * discipline. Now we have to worry about
1097 * panicing for a null queue.
1098 */
1099 if (tp->t_canq.c_cbreserved > 0 &&
1100 tp->t_rawq.c_cbreserved > 0) {
1101 catq(&tp->t_rawq, &tp->t_canq);
1102 /*
1103 * XXX the queue limits may be
1104 * different, so the old queue
1105 * swapping method no longer works.
1106 */
1107 catq(&tp->t_canq, &tp->t_rawq);
1108 }
1109 CLR(tp->t_lflag, PENDIN);
1110 }
1111 ttwakeup(tp);
1112 }
1113 tp->t_iflag = t->c_iflag;
1114 tp->t_oflag = t->c_oflag;
1115 /*
1116 * Make the EXTPROC bit read only.
1117 */
1118 if (ISSET(tp->t_lflag, EXTPROC))
1119 SET(t->c_lflag, EXTPROC);
1120 else
1121 CLR(t->c_lflag, EXTPROC);
1122 tp->t_lflag = t->c_lflag | ISSET(tp->t_lflag, PENDIN);
1123 if (t->c_cc[VMIN] != tp->t_cc[VMIN] ||
1124 t->c_cc[VTIME] != tp->t_cc[VTIME])
1125 ttwakeup(tp);
1126 bcopy(t->c_cc, tp->t_cc, sizeof(t->c_cc));
1127 crit_exit();
1128 break;
1129 }
1130 case TIOCSETD: { /* set line discipline */
1131 int t = *(int *)data;
1132 cdev_t device = tp->t_dev;
1133
1134 if ((u_int)t >= nlinesw) {
1135 lwkt_reltoken(&p->p_token);
1136 lwkt_reltoken(&tty_token);
1137 return (ENXIO);
1138 }
1139 if (t != tp->t_line) {
1140 crit_enter();
1141 (*linesw[tp->t_line].l_close)(tp, flag);
1142 error = (*linesw[t].l_open)(device, tp);
1143 if (error) {
1144 (void)(*linesw[tp->t_line].l_open)(device, tp);
1145 crit_exit();
1146 lwkt_reltoken(&p->p_token);
1147 lwkt_reltoken(&tty_token);
1148 return (error);
1149 }
1150 tp->t_line = t;
1151 crit_exit();
1152 }
1153 break;
1154 }
1155 case TIOCSTART: /* start output, like ^Q */
1156 crit_enter();
1157 if (ISSET(tp->t_state, TS_TTSTOP) ||
1158 ISSET(tp->t_lflag, FLUSHO)) {
1159 CLR(tp->t_lflag, FLUSHO);
1160 CLR(tp->t_state, TS_TTSTOP);
1161 ttstart(tp);
1162 }
1163 crit_exit();
1164 break;
1165 case TIOCSTI: /* simulate terminal input */
1166 if ((flag & FREAD) == 0 && priv_check(td, PRIV_ROOT)) {
1167 lwkt_reltoken(&p->p_token);
1168 lwkt_reltoken(&tty_token);
1169 return (EPERM);
1170 }
1171 if (!isctty(p, tp) && priv_check(td, PRIV_ROOT)) {
1172 lwkt_reltoken(&p->p_token);
1173 lwkt_reltoken(&tty_token);
1174 return (EACCES);
1175 }
1176 crit_enter();
1177 (*linesw[tp->t_line].l_rint)(*(u_char *)data, tp);
1178 crit_exit();
1179 break;
1180 case TIOCSTOP: /* stop output, like ^S */
1181 crit_enter();
1182 if (!ISSET(tp->t_state, TS_TTSTOP)) {
1183 SET(tp->t_state, TS_TTSTOP);
1184 (*tp->t_stop)(tp, 0);
1185 }
1186 crit_exit();
1187 break;
1188 case TIOCSCTTY: /* become controlling tty */
1189 /* Session ctty vnode pointer set in vnode layer. */
1190 if (!SESS_LEADER(p) ||
1191 ((p->p_session->s_ttyvp || tp->t_session) &&
1192 (tp->t_session != p->p_session))) {
1193 lwkt_reltoken(&p->p_token);
1194 lwkt_reltoken(&tty_token);
1195 return (EPERM);
1196 }
1197 ttyhold(tp);
1198 tp->t_session = p->p_session;
1199 opgrp = tp->t_pgrp;
1200 pgref(p->p_pgrp);
1201 tp->t_pgrp = p->p_pgrp;
1202 otp = p->p_session->s_ttyp;
1203 p->p_session->s_ttyp = tp;
1204 p->p_flags |= P_CONTROLT;
1205 if (otp)
1206 ttyunhold(otp);
1207 if (opgrp) {
1208 pgrel(opgrp);
1209 opgrp = NULL;
1210 }
1211 break;
1212 case TIOCSPGRP: { /* set pgrp of tty */
1213 pid_t pgid = *(int *)data;
1214
1215 if (!isctty(p, tp)) {
1216 lwkt_reltoken(&p->p_token);
1217 lwkt_reltoken(&tty_token);
1218 return (ENOTTY);
1219 }
1220 else if (pgid < 1 || pgid > PID_MAX) {
1221 lwkt_reltoken(&p->p_token);
1222 lwkt_reltoken(&tty_token);
1223 return (EINVAL);
1224 } else {
1225 struct pgrp *pgrp = pgfind(pgid);
1226 if (pgrp == NULL || pgrp->pg_session != p->p_session) {
1227 if (pgrp)
1228 pgrel(pgrp);
1229 lwkt_reltoken(&p->p_token);
1230 lwkt_reltoken(&tty_token);
1231 return (EPERM);
1232 }
1233 opgrp = tp->t_pgrp;
1234 tp->t_pgrp = pgrp;
1235 if (opgrp) {
1236 pgrel(opgrp);
1237 opgrp = NULL;
1238 }
1239 }
1240 break;
1241 }
1242 case TIOCSTAT: /* simulate control-T */
1243 crit_enter();
1244 ttyinfo(tp);
1245 crit_exit();
1246 break;
1247 case TIOCSWINSZ: /* set window size */
1248 if (bcmp((caddr_t)&tp->t_winsize, data,
1249 sizeof (struct winsize))) {
1250 tp->t_winsize = *(struct winsize *)data;
1251 pgsignal(tp->t_pgrp, SIGWINCH, 1);
1252 }
1253 break;
1254 case TIOCSDRAINWAIT:
1255 error = priv_check(td, PRIV_ROOT);
1256 if (error) {
1257 lwkt_reltoken(&p->p_token);
1258 lwkt_reltoken(&tty_token);
1259 return (error);
1260 }
1261 tp->t_timeout = *(int *)data * hz;
1262 wakeup(TSA_OCOMPLETE(tp));
1263 wakeup(TSA_OLOWAT(tp));
1264 break;
1265 case TIOCGDRAINWAIT:
1266 *(int *)data = tp->t_timeout / hz;
1267 break;
1268 default:
1269 lwkt_reltoken(&p->p_token);
1270 lwkt_reltoken(&tty_token);
1271 return (ENOIOCTL);
1272 }
1273 lwkt_reltoken(&p->p_token);
1274 lwkt_reltoken(&tty_token);
1275 return (0);
1276 }
1277
1278 static struct filterops ttyread_filtops =
1279 { FILTEROP_ISFD|FILTEROP_MPSAFE, NULL, filt_ttyrdetach, filt_ttyread };
1280 static struct filterops ttywrite_filtops =
1281 { FILTEROP_ISFD|FILTEROP_MPSAFE, NULL, filt_ttywdetach, filt_ttywrite };
1282
1283 int
1284 ttykqfilter(struct dev_kqfilter_args *ap)
1285 {
1286 cdev_t dev = ap->a_head.a_dev;
1287 struct knote *kn = ap->a_kn;
1288 struct tty *tp = dev->si_tty;
1289 struct klist *klist;
1290
1291 ap->a_result = 0;
1292
1293 lwkt_gettoken(&tty_token);
1294 switch (kn->kn_filter) {
1295 case EVFILT_READ:
1296 klist = &tp->t_rkq.ki_note;
1297 kn->kn_fop = &ttyread_filtops;
1298 break;
1299 case EVFILT_WRITE:
1300 klist = &tp->t_wkq.ki_note;
1301 kn->kn_fop = &ttywrite_filtops;
1302 break;
1303 default:
1304 ap->a_result = EOPNOTSUPP;
1305 lwkt_reltoken(&tty_token);
1306 return (0);
1307 }
1308 lwkt_reltoken(&tty_token);
1309 kn->kn_hook = (caddr_t)dev;
1310 knote_insert(klist, kn);
1311
1312 return (0);
1313 }
1314
1315 static void
1316 filt_ttyrdetach(struct knote *kn)
1317 {
1318 struct tty *tp = ((cdev_t)kn->kn_hook)->si_tty;
1319
1320 lwkt_gettoken(&tty_token);
1321 knote_remove(&tp->t_rkq.ki_note, kn);
1322 lwkt_reltoken(&tty_token);
1323 }
1324
1325 static int
1326 filt_ttyread(struct knote *kn, long hint)
1327 {
1328 struct tty *tp = ((cdev_t)kn->kn_hook)->si_tty;
1329
1330 lwkt_gettoken(&tty_token);
1331 kn->kn_data = ttnread(tp);
1332 if (ISSET(tp->t_state, TS_ZOMBIE)) {
1333 kn->kn_flags |= (EV_EOF | EV_NODATA);
1334 lwkt_reltoken(&tty_token);
1335 return (1);
1336 }
1337 lwkt_reltoken(&tty_token);
1338 return (kn->kn_data > 0);
1339 }
1340
1341 static void
1342 filt_ttywdetach(struct knote *kn)
1343 {
1344 struct tty *tp = ((cdev_t)kn->kn_hook)->si_tty;
1345
1346 lwkt_gettoken(&tty_token);
1347 knote_remove(&tp->t_wkq.ki_note, kn);
1348 lwkt_reltoken(&tty_token);
1349 }
1350
1351 static int
1352 filt_ttywrite(struct knote *kn, long hint)
1353 {
1354 struct tty *tp = ((cdev_t)kn->kn_hook)->si_tty;
1355 int ret;
1356
1357 lwkt_gettoken(&tty_token);
1358 kn->kn_data = tp->t_outq.c_cc;
1359 if (ISSET(tp->t_state, TS_ZOMBIE)) {
1360 lwkt_reltoken(&tty_token);
1361 return (1);
1362 }
1363 ret = (kn->kn_data <= tp->t_olowat &&
1364 ISSET(tp->t_state, TS_CONNECTED));
1365 lwkt_reltoken(&tty_token);
1366 return ret;
1367 }
1368
1369 /*
1370 * Must be called while in a critical section.
1371 * NOTE: tty_token must be held.
1372 */
1373 static int
1374 ttnread(struct tty *tp)
1375 {
1376 int nread;
1377
1378 ASSERT_LWKT_TOKEN_HELD(&tty_token);
1379 if (ISSET(tp->t_lflag, PENDIN))
1380 ttypend(tp);
1381 nread = tp->t_canq.c_cc;
1382 if (!ISSET(tp->t_lflag, ICANON)) {
1383 nread += tp->t_rawq.c_cc;
1384 if (nread < tp->t_cc[VMIN] && tp->t_cc[VTIME] == 0)
1385 nread = 0;
1386 }
1387 return (nread);
1388 }
1389
1390 /*
1391 * Wait for output to drain.
1392 */
1393 int
1394 ttywait(struct tty *tp)
1395 {
1396 int error;
1397
1398 error = 0;
1399 crit_enter();
1400 lwkt_gettoken(&tty_token);
1401 while ((tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY)) &&
1402 ISSET(tp->t_state, TS_CONNECTED) && tp->t_oproc) {
1403 (*tp->t_oproc)(tp);
1404 if ((tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY)) &&
1405 ISSET(tp->t_state, TS_CONNECTED)) {
1406 SET(tp->t_state, TS_SO_OCOMPLETE);
1407 error = ttysleep(tp, TSA_OCOMPLETE(tp),
1408 PCATCH, "ttywai",
1409 tp->t_timeout);
1410 if (error) {
1411 if (error == EWOULDBLOCK)
1412 error = EIO;
1413 break;
1414 }
1415 } else
1416 break;
1417 }
1418 if (!error && (tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY)))
1419 error = EIO;
1420 lwkt_reltoken(&tty_token);
1421 crit_exit();
1422 return (error);
1423 }
1424
1425 /*
1426 * Flush if successfully wait.
1427 */
1428 static int
1429 ttywflush(struct tty *tp)
1430 {
1431 int error;
1432
1433 if ((error = ttywait(tp)) == 0)
1434 ttyflush(tp, FREAD);
1435 return (error);
1436 }
1437
1438 /*
1439 * Flush tty read and/or write queues, notifying anyone waiting.
1440 */
1441 void
1442 ttyflush(struct tty *tp, int rw)
1443 {
1444 crit_enter();
1445 lwkt_gettoken(&tty_token);
1446 #if 0
1447 again:
1448 #endif
1449 if (rw & FWRITE) {
1450 FLUSHQ(&tp->t_outq);
1451 CLR(tp->t_state, TS_TTSTOP);
1452 }
1453 (*tp->t_stop)(tp, rw);
1454 if (rw & FREAD) {
1455 FLUSHQ(&tp->t_canq);
1456 FLUSHQ(&tp->t_rawq);
1457 CLR(tp->t_lflag, PENDIN);
1458 tp->t_rocount = 0;
1459 tp->t_rocol = 0;
1460 CLR(tp->t_state, TS_LOCAL);
1461 ttwakeup(tp);
1462 if (ISSET(tp->t_state, TS_TBLOCK)) {
1463 if (rw & FWRITE)
1464 FLUSHQ(&tp->t_outq);
1465 ttyunblock(tp);
1466
1467 /*
1468 * Don't let leave any state that might clobber the
1469 * next line discipline (although we should do more
1470 * to send the START char). Not clearing the state
1471 * may have caused the "putc to a clist with no
1472 * reserved cblocks" panic/kprintf.
1473 */
1474 CLR(tp->t_state, TS_TBLOCK);
1475
1476 #if 0 /* forget it, sleeping isn't always safe and we don't know when it is */
1477 if (ISSET(tp->t_iflag, IXOFF)) {
1478 /*
1479 * XXX wait a bit in the hope that the stop
1480 * character (if any) will go out. Waiting
1481 * isn't good since it allows races. This
1482 * will be fixed when the stop character is
1483 * put in a special queue. Don't bother with
1484 * the checks in ttywait() since the timeout
1485 * will save us.
1486 */
1487 SET(tp->t_state, TS_SO_OCOMPLETE);
1488 ttysleep(tp, TSA_OCOMPLETE(tp), 0,
1489 "ttyfls", hz / 10);
1490 /*
1491 * Don't try sending the stop character again.
1492 */
1493 CLR(tp->t_state, TS_TBLOCK);
1494 goto again;
1495 }
1496 #endif
1497 }
1498 }
1499 if (rw & FWRITE) {
1500 FLUSHQ(&tp->t_outq);
1501 ttwwakeup(tp);
1502 }
1503 lwkt_reltoken(&tty_token);
1504 crit_exit();
1505 }
1506
1507 /*
1508 * Copy in the default termios characters.
1509 */
1510 void
1511 termioschars(struct termios *t)
1512 {
1513 lwkt_gettoken(&tty_token);
1514 bcopy(ttydefchars, t->c_cc, sizeof t->c_cc);
1515 lwkt_reltoken(&tty_token);
1516 }
1517
1518 /*
1519 * Old interface.
1520 */
1521 void
1522 ttychars(struct tty *tp)
1523 {
1524 lwkt_gettoken(&tty_token);
1525 termioschars(&tp->t_termios);
1526 lwkt_reltoken(&tty_token);
1527 }
1528
1529 /*
1530 * Handle input high water. Send stop character for the IXOFF case. Turn
1531 * on our input flow control bit and propagate the changes to the driver.
1532 * XXX the stop character should be put in a special high priority queue.
1533 */
1534 void
1535 ttyblock(struct tty *tp)
1536 {
1537 lwkt_gettoken(&tty_token);
1538 SET(tp->t_state, TS_TBLOCK);
1539 if (ISSET(tp->t_iflag, IXOFF) && tp->t_cc[VSTOP] != _POSIX_VDISABLE &&
1540 clist_putc(tp->t_cc[VSTOP], &tp->t_outq) != 0)
1541 CLR(tp->t_state, TS_TBLOCK); /* try again later */
1542 ttstart(tp);
1543 lwkt_reltoken(&tty_token);
1544 }
1545
1546 /*
1547 * Handle input low water. Send start character for the IXOFF case. Turn
1548 * off our input flow control bit and propagate the changes to the driver.
1549 * XXX the start character should be put in a special high priority queue.
1550 */
1551 static void
1552 ttyunblock(struct tty *tp)
1553 {
1554 lwkt_gettoken(&tty_token);
1555 CLR(tp->t_state, TS_TBLOCK);
1556 if (ISSET(tp->t_iflag, IXOFF) && tp->t_cc[VSTART] != _POSIX_VDISABLE &&
1557 clist_putc(tp->t_cc[VSTART], &tp->t_outq) != 0)
1558 SET(tp->t_state, TS_TBLOCK); /* try again later */
1559 ttstart(tp);
1560 lwkt_reltoken(&tty_token);
1561 }
1562
1563 int
1564 ttstart(struct tty *tp)
1565 {
1566 lwkt_gettoken(&tty_token);
1567 if (tp->t_oproc != NULL) /* XXX: Kludge for pty. */
1568 (*tp->t_oproc)(tp);
1569 lwkt_reltoken(&tty_token);
1570 return (0);
1571 }
1572
1573 /*
1574 * "close" a line discipline
1575 */
1576 int
1577 ttylclose(struct tty *tp, int flag)
1578 {
1579 lwkt_gettoken(&tty_token);
1580 if (flag & FNONBLOCK || ttywflush(tp))
1581 ttyflush(tp, FREAD | FWRITE);
1582 lwkt_reltoken(&tty_token);
1583 return (0);
1584 }
1585
1586 void
1587 ttyhold(struct tty *tp)
1588 {
1589 ++tp->t_refs;
1590 }
1591
1592 void
1593 ttyunhold(struct tty *tp)
1594 {
1595 if (tp->t_unhold)
1596 tp->t_unhold(tp);
1597 else
1598 --tp->t_refs;
1599 }
1600
1601 /*
1602 * Handle modem control transition on a tty.
1603 * Flag indicates new state of carrier.
1604 * Returns 0 if the line should be turned off, otherwise 1.
1605 */
1606 int
1607 ttymodem(struct tty *tp, int flag)
1608 {
1609 lwkt_gettoken(&tty_token);
1610 if (ISSET(tp->t_state, TS_CARR_ON) && ISSET(tp->t_cflag, MDMBUF)) {
1611 /*
1612 * MDMBUF: do flow control according to carrier flag
1613 * XXX TS_CAR_OFLOW doesn't do anything yet. TS_TTSTOP
1614 * works if IXON and IXANY are clear.
1615 */
1616 if (flag) {
1617 CLR(tp->t_state, TS_CAR_OFLOW);
1618 CLR(tp->t_state, TS_TTSTOP);
1619 ttstart(tp);
1620 } else if (!ISSET(tp->t_state, TS_CAR_OFLOW)) {
1621 SET(tp->t_state, TS_CAR_OFLOW);
1622 SET(tp->t_state, TS_TTSTOP);
1623 (*tp->t_stop)(tp, 0);
1624 }
1625 } else if (flag == 0) {
1626 /*
1627 * Lost carrier.
1628 */
1629 CLR(tp->t_state, TS_CARR_ON);
1630 if (ISSET(tp->t_state, TS_ISOPEN) &&
1631 !ISSET(tp->t_cflag, CLOCAL)) {
1632 SET(tp->t_state, TS_ZOMBIE);
1633 CLR(tp->t_state, TS_CONNECTED);
1634 if (tp->t_session && tp->t_session->s_leader)
1635 ksignal(tp->t_session->s_leader, SIGHUP);
1636 ttyflush(tp, FREAD | FWRITE);
1637 lwkt_reltoken(&tty_token);
1638 return (0);
1639 }
1640 } else {
1641 /*
1642 * Carrier now on.
1643 */
1644 SET(tp->t_state, TS_CARR_ON);
1645 if (!ISSET(tp->t_state, TS_ZOMBIE))
1646 SET(tp->t_state, TS_CONNECTED);
1647 wakeup(TSA_CARR_ON(tp));
1648 ttwakeup(tp);
1649 ttwwakeup(tp);
1650 }
1651 lwkt_reltoken(&tty_token);
1652 return (1);
1653 }
1654
1655 /*
1656 * Reinput pending characters after state switch
1657 * call from a critical section.
1658 */
1659 static void
1660 ttypend(struct tty *tp)
1661 {
1662 struct clist tq;
1663 int c;
1664
1665 lwkt_gettoken(&tty_token);
1666 CLR(tp->t_lflag, PENDIN);
1667 SET(tp->t_state, TS_TYPEN);
1668 /*
1669 * XXX this assumes too much about clist internals. It may even
1670 * fail if the cblock slush pool is empty. We can't allocate more
1671 * cblocks here because we are called from an interrupt handler
1672 * and clist_alloc_cblocks() can wait.
1673 */
1674 tq = tp->t_rawq;
1675 bzero(&tp->t_rawq, sizeof tp->t_rawq);
1676 tp->t_rawq.c_cbmax = tq.c_cbmax;
1677 tp->t_rawq.c_cbreserved = tq.c_cbreserved;
1678 while ((c = clist_getc(&tq)) >= 0)
1679 ttyinput(c, tp);
1680 CLR(tp->t_state, TS_TYPEN);
1681 lwkt_reltoken(&tty_token);
1682 }
1683
1684 /*
1685 * Process a read call on a tty device.
1686 */
1687 int
1688 ttread(struct tty *tp, struct uio *uio, int flag)
1689 {
1690 struct clist *qp;
1691 int c;
1692 tcflag_t lflag;
1693 cc_t *cc = tp->t_cc;
1694 struct proc *pp;
1695 struct lwp *lp;
1696 int first, error = 0;
1697 int has_stime = 0, last_cc = 0;
1698 long slp = 0; /* XXX this should be renamed `timo'. */
1699 struct timeval stime;
1700
1701 lp = curthread->td_lwp;
1702 stime.tv_sec = 0; /* fix compiler warnings */
1703 stime.tv_usec = 0;
1704
1705 lwkt_gettoken(&tty_token);
1706 loop:
1707 crit_enter();
1708 lflag = tp->t_lflag;
1709 /*
1710 * take pending input first
1711 */
1712 if (ISSET(lflag, PENDIN)) {
1713 ttypend(tp);
1714 splz(); /* reduce latency */
1715 lflag = tp->t_lflag; /* XXX ttypend() clobbers it */
1716 }
1717
1718 /*
1719 * Hang process if it's in the background.
1720 */
1721 if ((pp = curproc) != NULL)
1722 lwkt_gettoken(&pp->p_token);
1723 if (pp && isbackground(pp, tp)) {
1724 crit_exit();
1725 if (SIGISMEMBER(pp->p_sigignore, SIGTTIN) ||
1726 SIGISMEMBER(lp->lwp_sigmask, SIGTTIN) ||
1727 (pp->p_flags & P_PPWAIT) || pp->p_pgrp->pg_jobc == 0) {
1728 lwkt_reltoken(&pp->p_token);
1729 lwkt_reltoken(&tty_token);
1730 return (EIO);
1731 }
1732 pgsignal(pp->p_pgrp, SIGTTIN, 1);
1733 error = ttysleep(tp, &lbolt, PCATCH, "ttybg2", 0);
1734 if (error) {
1735 lwkt_reltoken(&pp->p_token);
1736 lwkt_reltoken(&tty_token);
1737 return (error);
1738 }
1739 lwkt_reltoken(&pp->p_token);
1740 goto loop;
1741 }
1742 if (pp)
1743 lwkt_reltoken(&pp->p_token);
1744
1745 if (ISSET(tp->t_state, TS_ZOMBIE)) {
1746 crit_exit();
1747 lwkt_reltoken(&tty_token);
1748 return (0); /* EOF */
1749 }
1750
1751 /*
1752 * If canonical, use the canonical queue,
1753 * else use the raw queue.
1754 *
1755 * (should get rid of clists...)
1756 */
1757 qp = ISSET(lflag, ICANON) ? &tp->t_canq : &tp->t_rawq;
1758
1759 if (flag & IO_NDELAY) {
1760 if (qp->c_cc > 0)
1761 goto read;
1762 if (!ISSET(lflag, ICANON) && cc[VMIN] == 0) {
1763 crit_exit();
1764 lwkt_reltoken(&tty_token);
1765 return (0);
1766 }
1767 crit_exit();
1768 lwkt_reltoken(&tty_token);
1769 return (EWOULDBLOCK);
1770 }
1771 if (!ISSET(lflag, ICANON)) {
1772 int m = cc[VMIN];
1773 long t = cc[VTIME];
1774 struct timeval timecopy;
1775
1776 /*
1777 * Check each of the four combinations.
1778 * (m > 0 && t == 0) is the normal read case.
1779 * It should be fairly efficient, so we check that and its
1780 * companion case (m == 0 && t == 0) first.
1781 * For the other two cases, we compute the target sleep time
1782 * into slp.
1783 */
1784 if (t == 0) {
1785 if (qp->c_cc < m)
1786 goto sleep;
1787 if (qp->c_cc > 0)
1788 goto read;
1789
1790 /* m, t and qp->c_cc are all 0. 0 is enough input. */
1791 crit_exit();
1792 lwkt_reltoken(&tty_token);
1793 return (0);
1794 }
1795 t *= 100000; /* time in us */
1796 #define diff(t1, t2) (((t1).tv_sec - (t2).tv_sec) * 1000000 + \
1797 ((t1).tv_usec - (t2).tv_usec))
1798 if (m > 0) {
1799 if (qp->c_cc <= 0)
1800 goto sleep;
1801 if (qp->c_cc >= m)
1802 goto read;
1803 getmicrotime(&timecopy);
1804 if (has_stime == 0) {
1805 /* first character, start timer */
1806 has_stime = 1;
1807 stime = timecopy;
1808 slp = t;
1809 } else if (qp->c_cc > last_cc) {
1810 /* got a character, restart timer */
1811 stime = timecopy;
1812 slp = t;
1813 } else {
1814 /* nothing, check expiration */
1815 slp = t - diff(timecopy, stime);
1816 if (slp <= 0)
1817 goto read;
1818 }
1819 last_cc = qp->c_cc;
1820 } else { /* m == 0 */
1821 if (qp->c_cc > 0)
1822 goto read;
1823 getmicrotime(&timecopy);
1824 if (has_stime == 0) {
1825 has_stime = 1;
1826 stime = timecopy;
1827 slp = t;
1828 } else {
1829 slp = t - diff(timecopy, stime);
1830 if (slp <= 0) {
1831 /* Timed out, but 0 is enough input. */
1832 crit_exit();
1833 lwkt_reltoken(&tty_token);
1834 return (0);
1835 }
1836 }
1837 }
1838 #undef diff
1839 /*
1840 * Rounding down may make us wake up just short
1841 * of the target, so we round up.
1842 * The formula is ceiling(slp * hz/1000000).
1843 * 32-bit arithmetic is enough for hz < 169.
1844 * XXX see tvtohz() for how to avoid overflow if hz
1845 * is large (divide by `tick' and/or arrange to
1846 * use tvtohz() if hz is large).
1847 */
1848 slp = (long) (((u_long)slp * hz) + 999999) / 1000000;
1849 goto sleep;
1850 }
1851 if (qp->c_cc <= 0) {
1852 sleep:
1853 /*
1854 * There is no input, or not enough input and we can block.
1855 */
1856 error = ttysleep(tp, TSA_HUP_OR_INPUT(tp), PCATCH,
1857 ISSET(tp->t_state, TS_CONNECTED) ?
1858 "ttyin" : "ttyhup", (int)slp);
1859 crit_exit();
1860 if (error == EWOULDBLOCK)
1861 error = 0;
1862 else if (error) {
1863 lwkt_reltoken(&tty_token);
1864 return (error);
1865 }
1866 /*
1867 * XXX what happens if another process eats some input
1868 * while we are asleep (not just here)? It would be
1869 * safest to detect changes and reset our state variables
1870 * (has_stime and last_cc).
1871 */
1872 slp = 0;
1873 goto loop;
1874 }
1875 read:
1876 crit_exit();
1877 /*
1878 * Input present, check for input mapping and processing.
1879 */
1880 first = 1;
1881 if (ISSET(lflag, ICANON | ISIG))
1882 goto slowcase;
1883 for (;;) {
1884 char ibuf[IBUFSIZ];
1885 int icc;
1886
1887 icc = (int)szmin(uio->uio_resid, IBUFSIZ);
1888 icc = q_to_b(qp, ibuf, icc);
1889 if (icc <= 0) {
1890 if (first)
1891 goto loop;
1892 break;
1893 }
1894 error = uiomove(ibuf, (size_t)icc, uio);
1895 /*
1896 * XXX if there was an error then we should ungetc() the
1897 * unmoved chars and reduce icc here.
1898 */
1899 if (error)
1900 break;
1901 if (uio->uio_resid == 0)
1902 break;
1903 first = 0;
1904 }
1905 goto out;
1906 slowcase:
1907 for (;;) {
1908 c = clist_getc(qp);
1909 if (c < 0) {
1910 if (first)
1911 goto loop;
1912 break;
1913 }
1914 /*
1915 * delayed suspend (^Y)
1916 */
1917 if (CCEQ(cc[VDSUSP], c) &&
1918 ISSET(lflag, IEXTEN | ISIG) == (IEXTEN | ISIG)) {
1919 pgsignal(tp->t_pgrp, SIGTSTP, 1);
1920 if (first) {
1921 error = ttysleep(tp, &lbolt, PCATCH,
1922 "ttybg3", 0);
1923 if (error)
1924 break;
1925 goto loop;
1926 }
1927 break;
1928 }
1929 /*
1930 * Interpret EOF only in canonical mode.
1931 */
1932 if (CCEQ(cc[VEOF], c) && ISSET(lflag, ICANON))
1933 break;
1934 /*
1935 * Give user character.
1936 */
1937 error = ureadc(c, uio);
1938 if (error)
1939 /* XXX should ungetc(c, qp). */
1940 break;
1941 if (uio->uio_resid == 0)
1942 break;
1943 /*
1944 * In canonical mode check for a "break character"
1945 * marking the end of a "line of input".
1946 */
1947 if (ISSET(lflag, ICANON) && TTBREAKC(c, lflag))
1948 break;
1949 first = 0;
1950 }
1951
1952 out:
1953 /*
1954 * Look to unblock input now that (presumably)
1955 * the input queue has gone down.
1956 */
1957 crit_enter();
1958 if (ISSET(tp->t_state, TS_TBLOCK) &&
1959 tp->t_rawq.c_cc + tp->t_canq.c_cc <= tp->t_ilowat)
1960 ttyunblock(tp);
1961 crit_exit();
1962
1963 lwkt_reltoken(&tty_token);
1964 return (error);
1965 }
1966
1967 /*
1968 * Check the output queue on tp for space for a kernel message (from uprintf
1969 * or tprintf). Allow some space over the normal hiwater mark so we don't
1970 * lose messages due to normal flow control, but don't let the tty run amok.
1971 * Sleeps here are not interruptible, but we return prematurely if new signals
1972 * arrive.
1973 */
1974 int
1975 ttycheckoutq(struct tty *tp, int wait)
1976 {
1977 struct lwp *lp = curthread->td_lwp;
1978 int hiwat;
1979 sigset_t oldset, newset;
1980
1981 lwkt_gettoken(&tty_token);
1982 hiwat = tp->t_ohiwat;
1983 SIGEMPTYSET(oldset);
1984 SIGEMPTYSET(newset);
1985 crit_enter();
1986 if (wait)
1987 oldset = lwp_sigpend(lp);
1988 if (tp->t_outq.c_cc > hiwat + OBUFSIZ + 100) {
1989 while (tp->t_outq.c_cc > hiwat) {
1990 ttstart(tp);
1991 if (tp->t_outq.c_cc <= hiwat)
1992 break;
1993 if (wait)
1994 newset = lwp_sigpend(lp);
1995 if (!wait || SIGSETNEQ(oldset, newset)) {
1996 crit_exit();
1997 lwkt_reltoken(&tty_token);
1998 return (0);
1999 }
2000 SET(tp->t_state, TS_SO_OLOWAT);
2001 tsleep(TSA_OLOWAT(tp), 0, "ttoutq", hz);
2002 }
2003 }
2004 crit_exit();
2005 lwkt_reltoken(&tty_token);
2006 return (1);
2007 }
2008
2009 /*
2010 * Process a write call on a tty device.
2011 */
2012 int
2013 ttwrite(struct tty *tp, struct uio *uio, int flag)
2014 {
2015 char *cp = NULL;
2016 int cc, ce;
2017 struct proc *pp;
2018 struct lwp *lp;
2019 int i, hiwat, error;
2020 size_t cnt;
2021
2022 char obuf[OBUFSIZ];
2023
2024 lwkt_gettoken(&tty_token);
2025 lp = curthread->td_lwp;
2026 hiwat = tp->t_ohiwat;
2027 cnt = uio->uio_resid;
2028 error = 0;
2029 cc = 0;
2030 loop:
2031 crit_enter();
2032 if (ISSET(tp->t_state, TS_ZOMBIE)) {
2033 crit_exit();
2034 if (uio->uio_resid == cnt)
2035 error = EIO;
2036 goto out;
2037 }
2038 if (!ISSET(tp->t_state, TS_CONNECTED)) {
2039 if (flag & IO_NDELAY) {
2040 crit_exit();
2041 error = EWOULDBLOCK;
2042 goto out;
2043 }
2044 error = ttysleep(tp, TSA_CARR_ON(tp), PCATCH, "ttydcd", 0);
2045 crit_exit();
2046 if (error)
2047 goto out;
2048 goto loop;
2049 }
2050 crit_exit();
2051
2052 /*
2053 * Hang the process if it's in the background.
2054 */
2055 if ((pp = curproc) != NULL)
2056 lwkt_gettoken(&pp->p_token);
2057 if (pp && isbackground(pp, tp) &&
2058 ISSET(tp->t_lflag, TOSTOP) && !(pp->p_flags & P_PPWAIT) &&
2059 !SIGISMEMBER(pp->p_sigignore, SIGTTOU) &&
2060 !SIGISMEMBER(lp->lwp_sigmask, SIGTTOU)) {
2061 if (pp->p_pgrp->pg_jobc == 0) {
2062 error = EIO;
2063 lwkt_reltoken(&pp->p_token);
2064 goto out;
2065 }
2066 pgsignal(pp->p_pgrp, SIGTTOU, 1);
2067 lwkt_reltoken(&pp->p_token);
2068 error = ttysleep(tp, &lbolt, PCATCH, "ttybg4", 0);
2069 if (error)
2070 goto out;
2071 goto loop;
2072 }
2073 if (pp)
2074 lwkt_reltoken(&pp->p_token);
2075 /*
2076 * Process the user's data in at most OBUFSIZ chunks. Perform any
2077 * output translation. Keep track of high water mark, sleep on
2078 * overflow awaiting device aid in acquiring new space.
2079 */
2080 while (uio->uio_resid > 0 || cc > 0) {
2081 if (ISSET(tp->t_lflag, FLUSHO)) {
2082 uio->uio_resid = 0;
2083 lwkt_reltoken(&tty_token);
2084 return (0);
2085 }
2086 if (tp->t_outq.c_cc > hiwat)
2087 goto ovhiwat;
2088 /*
2089 * Grab a hunk of data from the user, unless we have some
2090 * leftover from last time.
2091 */
2092 if (cc == 0) {
2093 cc = szmin(uio->uio_resid, OBUFSIZ);
2094 cp = obuf;
2095 error = uiomove(cp, (size_t)cc, uio);
2096 if (error) {
2097 cc = 0;
2098 break;
2099 }
2100 }
2101 /*
2102 * If nothing fancy need be done, grab those characters we
2103 * can handle without any of ttyoutput's processing and
2104 * just transfer them to the output q. For those chars
2105 * which require special processing (as indicated by the
2106 * bits in char_type), call ttyoutput. After processing
2107 * a hunk of data, look for FLUSHO so ^O's will take effect
2108 * immediately.
2109 */
2110 while (cc > 0) {
2111 if (!ISSET(tp->t_oflag, OPOST))
2112 ce = cc;
2113 else {
2114 ce = cc - scanc((u_int)cc, (u_char *)cp,
2115 char_type, CCLASSMASK);
2116 /*
2117 * If ce is zero, then we're processing
2118 * a special character through ttyoutput.
2119 */
2120 if (ce == 0) {
2121 tp->t_rocount = 0;
2122 if (ttyoutput(*cp, tp) >= 0) {
2123 /* No Clists, wait a bit. */
2124 ttstart(tp);
2125 if (flag & IO_NDELAY) {
2126 error = EWOULDBLOCK;
2127 goto out;
2128 }
2129 error = ttysleep(tp, &lbolt,
2130 PCATCH,
2131 "ttybf1", 0);
2132 if (error)
2133 goto out;
2134 goto loop;
2135 }
2136 cp++;
2137 cc--;
2138 if (ISSET(tp->t_lflag, FLUSHO) ||
2139 tp->t_outq.c_cc > hiwat)
2140 goto ovhiwat;
2141 continue;
2142 }
2143 }
2144 /*
2145 * A bunch of normal characters have been found.
2146 * Transfer them en masse to the output queue and
2147 * continue processing at the top of the loop.
2148 * If there are any further characters in this
2149 * <= OBUFSIZ chunk, the first should be a character
2150 * requiring special handling by ttyoutput.
2151 */
2152 tp->t_rocount = 0;
2153 i = b_to_q(cp, ce, &tp->t_outq);
2154 ce -= i;
2155 tp->t_column += ce;
2156 cp += ce, cc -= ce, tk_nout += ce;
2157 tp->t_outcc += ce;
2158 if (i > 0) {
2159 /* No Clists, wait a bit. */
2160 ttstart(tp);
2161 if (flag & IO_NDELAY) {
2162 error = EWOULDBLOCK;
2163 goto out;
2164 }
2165 error = ttysleep(tp, &lbolt, PCATCH,
2166 "ttybf2", 0);
2167 if (error)
2168 goto out;
2169 goto loop;
2170 }
2171 if (ISSET(tp->t_lflag, FLUSHO) ||
2172 tp->t_outq.c_cc > hiwat)
2173 break;
2174 }
2175 ttstart(tp);
2176 }
2177 out:
2178 /*
2179 * If cc is nonzero, we leave the uio structure inconsistent, as the
2180 * offset and iov pointers have moved forward, but it doesn't matter
2181 * (the call will either return short or restart with a new uio).
2182 */
2183 uio->uio_resid += cc;
2184 lwkt_reltoken(&tty_token);
2185 return (error);
2186
2187 ovhiwat:
2188 ttstart(tp);
2189 crit_enter();
2190 /*
2191 * This can only occur if FLUSHO is set in t_lflag,
2192 * or if ttstart/oproc is synchronous (or very fast).
2193 */
2194 if (tp->t_outq.c_cc <= hiwat) {
2195 crit_exit();
2196 goto loop;
2197 }
2198 if (flag & IO_NDELAY) {
2199 crit_exit();
2200 uio->uio_resid += cc;
2201 lwkt_reltoken(&tty_token);
2202 return (uio->uio_resid == cnt ? EWOULDBLOCK : 0);
2203 }
2204 SET(tp->t_state, TS_SO_OLOWAT);
2205 error = ttysleep(tp, TSA_OLOWAT(tp), PCATCH, "ttywri", tp->t_timeout);
2206 crit_exit();
2207 if (error == EWOULDBLOCK)
2208 error = EIO;
2209 if (error)
2210 goto out;
2211 goto loop;
2212 }
2213
2214 /*
2215 * Rubout one character from the rawq of tp
2216 * as cleanly as possible.
2217 * NOTE: Must be called with tty_token held
2218 */
2219 static void
2220 ttyrub(int c, struct tty *tp)
2221 {
2222 char *cp;
2223 int savecol;
2224 int tabc;
2225
2226 ASSERT_LWKT_TOKEN_HELD(&tty_token);
2227 if (!ISSET(tp->t_lflag, ECHO) || ISSET(tp->t_lflag, EXTPROC))
2228 return;
2229 CLR(tp->t_lflag, FLUSHO);
2230 if (ISSET(tp->t_lflag, ECHOE)) {
2231 if (tp->t_rocount == 0) {
2232 /*
2233 * Screwed by ttwrite; retype
2234 */
2235 ttyretype(tp);
2236 return;
2237 }
2238 if (c == ('\t' | TTY_QUOTE) || c == ('\n' | TTY_QUOTE))
2239 ttyrubo(tp, 2);
2240 else {
2241 CLR(c, ~TTY_CHARMASK);
2242 switch (CCLASS(c)) {
2243 case ORDINARY:
2244 ttyrubo(tp, 1);
2245 break;
2246 case BACKSPACE:
2247 case CONTROL:
2248 case NEWLINE:
2249 case RETURN:
2250 case VTAB:
2251 if (ISSET(tp->t_lflag, ECHOCTL))
2252 ttyrubo(tp, 2);
2253 break;
2254 case TAB:
2255 if (tp->t_rocount < tp->t_rawq.c_cc) {
2256 ttyretype(tp);
2257 return;
2258 }
2259 crit_enter();
2260 savecol = tp->t_column;
2261 SET(tp->t_state, TS_CNTTB);
2262 SET(tp->t_lflag, FLUSHO);
2263 tp->t_column = tp->t_rocol;
2264 cp = tp->t_rawq.c_cf;
2265 if (cp)
2266 tabc = *cp; /* XXX FIX NEXTC */
2267 for (; cp; cp = nextc(&tp->t_rawq, cp, &tabc))
2268 ttyecho(tabc, tp);
2269 CLR(tp->t_lflag, FLUSHO);
2270 CLR(tp->t_state, TS_CNTTB);
2271 crit_exit();
2272
2273 /* savecol will now be length of the tab. */
2274 savecol -= tp->t_column;
2275 tp->t_column += savecol;
2276 if (savecol > 8)
2277 savecol = 8; /* overflow screw */
2278 while (--savecol >= 0)
2279 (void)ttyoutput('\b', tp);
2280 break;
2281 default: /* XXX */
2282 #define PANICSTR "ttyrub: would panic c = %d, val = %d\n"
2283 (void)kprintf(PANICSTR, c, CCLASS(c));
2284 #ifdef notdef
2285 panic(PANICSTR, c, CCLASS(c));
2286 #endif
2287 }
2288 }
2289 } else if (ISSET(tp->t_lflag, ECHOPRT)) {
2290 if (!ISSET(tp->t_state, TS_ERASE)) {
2291 SET(tp->t_state, TS_ERASE);
2292 (void)ttyoutput('\\', tp);
2293 }
2294 ttyecho(c, tp);
2295 } else {
2296 ttyecho(tp->t_cc[VERASE], tp);
2297 /*
2298 * This code may be executed not only when an ERASE key
2299 * is pressed, but also when ^U (KILL) or ^W (WERASE) are.
2300 * So, I didn't think it was worthwhile to pass the extra
2301 * information (which would need an extra parameter,
2302 * changing every call) needed to distinguish the ERASE2
2303 * case from the ERASE.
2304 */
2305 }
2306 --tp->t_rocount;
2307 }
2308
2309 /*
2310 * Back over cnt characters, erasing them.
2311 * NOTE: Must be called with tty_token held
2312 */
2313 static void
2314 ttyrubo(struct tty *tp, int cnt)
2315 {
2316 ASSERT_LWKT_TOKEN_HELD(&tty_token);
2317 while (cnt-- > 0) {
2318 (void)ttyoutput('\b', tp);
2319 (void)ttyoutput(' ', tp);
2320 (void)ttyoutput('\b', tp);
2321 }
2322 }
2323
2324 /*
2325 * ttyretype --
2326 * Reprint the rawq line. Note, it is assumed that c_cc has already
2327 * been checked.
2328 * NOTE: Must be called with tty_token held
2329 */
2330 static void
2331 ttyretype(struct tty *tp)
2332 {
2333 char *cp;
2334 int c;
2335
2336 ASSERT_LWKT_TOKEN_HELD(&tty_token);
2337 /* Echo the reprint character. */
2338 if (tp->t_cc[VREPRINT] != _POSIX_VDISABLE)
2339 ttyecho(tp->t_cc[VREPRINT], tp);
2340
2341 (void)ttyoutput('\n', tp);
2342
2343 /*
2344 * XXX
2345 * FIX: NEXTC IS BROKEN - DOESN'T CHECK QUOTE
2346 * BIT OF FIRST CHAR.
2347 */
2348 crit_enter();
2349 for (cp = tp->t_canq.c_cf, c = (cp != NULL ? *cp : 0);
2350 cp != NULL; cp = nextc(&tp->t_canq, cp, &c))
2351 ttyecho(c, tp);
2352 for (cp = tp->t_rawq.c_cf, c = (cp != NULL ? *cp : 0);
2353 cp != NULL; cp = nextc(&tp->t_rawq, cp, &c))
2354 ttyecho(c, tp);
2355 CLR(tp->t_state, TS_ERASE);
2356 crit_exit();
2357
2358 tp->t_rocount = tp->t_rawq.c_cc;
2359 tp->t_rocol = 0;
2360 }
2361
2362 /*
2363 * Echo a typed character to the terminal.
2364 * NOTE: Must be called with tty_token held
2365 */
2366 static void
2367 ttyecho(int c, struct tty *tp)
2368 {
2369 ASSERT_LWKT_TOKEN_HELD(&tty_token);
2370
2371 if (!ISSET(tp->t_state, TS_CNTTB))
2372 CLR(tp->t_lflag, FLUSHO);
2373 if ((!ISSET(tp->t_lflag, ECHO) &&
2374 (c != '\n' || !ISSET(tp->t_lflag, ECHONL))) ||
2375 ISSET(tp->t_lflag, EXTPROC))
2376 return;
2377 if (ISSET(tp->t_lflag, ECHOCTL) &&
2378 ((ISSET(c, TTY_CHARMASK) <= 037 && c != '\t' && c != '\n') ||
2379 ISSET(c, TTY_CHARMASK) == 0177)) {
2380 (void)ttyoutput('^', tp);
2381 CLR(c, ~TTY_CHARMASK);
2382 if (c == 0177)
2383 c = '?';
2384 else
2385 c += 'A' - 1;
2386 }
2387 (void)ttyoutput(c, tp);
2388 }
2389
2390 /*
2391 * Wake up any readers on a tty.
2392 */
2393 void
2394 ttwakeup(struct tty *tp)
2395 {
2396 lwkt_gettoken(&tty_token);
2397 if (ISSET(tp->t_state, TS_ASYNC) && tp->t_sigio != NULL)
2398 pgsigio(tp->t_sigio, SIGIO, (tp->t_session != NULL));
2399 wakeup(TSA_HUP_OR_INPUT(tp));
2400 KNOTE(&tp->t_rkq.ki_note, 0);
2401 lwkt_reltoken(&tty_token);
2402 }
2403
2404 /*
2405 * Wake up any writers on a tty.
2406 */
2407 void
2408 ttwwakeup(struct tty *tp)
2409 {
2410 lwkt_gettoken(&tty_token);
2411 if (ISSET(tp->t_state, TS_ASYNC) && tp->t_sigio != NULL)
2412 pgsigio(tp->t_sigio, SIGIO, (tp->t_session != NULL));
2413 if (ISSET(tp->t_state, TS_BUSY | TS_SO_OCOMPLETE) ==
2414 TS_SO_OCOMPLETE && tp->t_outq.c_cc == 0) {
2415 CLR(tp->t_state, TS_SO_OCOMPLETE);
2416 wakeup(TSA_OCOMPLETE(tp));
2417 }
2418 if (ISSET(tp->t_state, TS_SO_OLOWAT) &&
2419 tp->t_outq.c_cc <= tp->t_olowat) {
2420 CLR(tp->t_state, TS_SO_OLOWAT);
2421 wakeup(TSA_OLOWAT(tp));
2422 }
2423 KNOTE(&tp->t_wkq.ki_note, 0);
2424 lwkt_reltoken(&tty_token);
2425 }
2426
2427 /*
2428 * Look up a code for a specified speed in a conversion table;
2429 * used by drivers to map software speed values to hardware parameters.
2430 * No requirements
2431 */
2432 int
2433 ttspeedtab(int speed, struct speedtab *table)
2434 {
2435
2436 for ( ; table->sp_speed != -1; table++)
2437 if (table->sp_speed == speed)
2438 return (table->sp_code);
2439 return (-1);
2440 }
2441
2442 /*
2443 * Set input and output watermarks and buffer sizes. For input, the
2444 * high watermark is about one second's worth of input above empty, the
2445 * low watermark is slightly below high water, and the buffer size is a
2446 * driver-dependent amount above high water. For output, the watermarks
2447 * are near the ends of the buffer, with about 1 second's worth of input
2448 * between them. All this only applies to the standard line discipline.
2449 */
2450 void
2451 ttsetwater(struct tty *tp)
2452 {
2453 int cps, ttmaxhiwat, x;
2454
2455 lwkt_gettoken(&tty_token);
2456 /* Input. */
2457 clist_alloc_cblocks(&tp->t_canq, TTYHOG, 512);
2458 switch (tp->t_ispeedwat) {
2459 case (speed_t)-1:
2460 cps = tp->t_ispeed / 10;
2461 break;
2462 case 0:
2463 /*
2464 * This case is for old drivers that don't know about
2465 * t_ispeedwat. Arrange for them to get the old buffer
2466 * sizes and watermarks.
2467 */
2468 cps = TTYHOG - 2 * 256;
2469 tp->t_ififosize = 2 * 2048;
2470 break;
2471 default:
2472 cps = tp->t_ispeedwat / 10;
2473 break;
2474 }
2475 tp->t_ihiwat = cps;
2476 tp->t_ilowat = 7 * cps / 8;
2477 x = cps + tp->t_ififosize;
2478 clist_alloc_cblocks(&tp->t_rawq, x, x);
2479
2480 /* Output. */
2481 switch (tp->t_ospeedwat) {
2482 case (speed_t)-1:
2483 cps = tp->t_ospeed / 10;
2484 ttmaxhiwat = 2 * TTMAXHIWAT;
2485 break;
2486 case 0:
2487 cps = tp->t_ospeed / 10;
2488 ttmaxhiwat = TTMAXHIWAT;
2489 break;
2490 default:
2491 cps = tp->t_ospeedwat / 10;
2492 ttmaxhiwat = 8 * TTMAXHIWAT;
2493 break;
2494 }
2495 #define CLAMP(x, h, l) ((x) > h ? h : ((x) < l) ? l : (x))
2496 tp->t_olowat = x = CLAMP(cps / 2, TTMAXLOWAT, TTMINLOWAT);
2497 x += cps;
2498 x = CLAMP(x, ttmaxhiwat, TTMINHIWAT); /* XXX clamps are too magic */
2499 tp->t_ohiwat = roundup(x, CBSIZE); /* XXX for compat */
2500 x = imax(tp->t_ohiwat, TTMAXHIWAT); /* XXX for compat/safety */
2501 x += OBUFSIZ + 100;
2502 clist_alloc_cblocks(&tp->t_outq, x, x);
2503 #undef CLAMP
2504 lwkt_reltoken(&tty_token);
2505 }
2506
2507 /*
2508 * Report on state of foreground process group.
2509 */
2510 void
2511 ttyinfo(struct tty *tp)
2512 {
2513 struct pgrp *pgrp;
2514 struct proc *p, *pick;
2515 struct lwp *lp;
2516 struct rusage ru;
2517 char buf[64];
2518 const char *str;
2519 struct vmspace *vm;
2520 long vmsz;
2521 int pctcpu;
2522 int tmp;
2523
2524 if (ttycheckoutq(tp,0) == 0)
2525 return;
2526
2527 lwkt_gettoken(&tty_token);
2528
2529 /*
2530 * We always print the load average, then figure out what else to
2531 * print based on the state of the current process group.
2532 */
2533 tmp = (averunnable.ldavg[0] * 100 + FSCALE / 2) >> FSHIFT;
2534 ttyprintf(tp, "load: %d.%02d ", tmp / 100, tmp % 100);
2535
2536 if (tp->t_session == NULL) {
2537 ttyprintf(tp, "not a controlling terminal\n");
2538 goto done2;
2539 }
2540 if ((pgrp = tp->t_pgrp) == NULL) {
2541 ttyprintf(tp, "no foreground process group\n");
2542 goto done2;
2543 }
2544
2545 /*
2546 * Pick an interesting process. Note that certain elements,
2547 * in particular the wmesg, require a critical section for
2548 * safe access (YYY and we are still not MP safe).
2549 *
2550 * NOTE: lwp_wmesg is lwp_thread->td_wmesg.
2551 */
2552 pgref(pgrp);
2553 lwkt_gettoken(&pgrp->pg_token);
2554
2555 pick = NULL;
2556 for (p = LIST_FIRST(&pgrp->pg_members);
2557 p != NULL;
2558 p = LIST_NEXT(p, p_pglist)) {
2559 PHOLD(p);
2560 if (proc_compare(pick, p)) {
2561 if (pick)
2562 PRELE(pick);
2563 pick = p;
2564 } else {
2565 PRELE(p);
2566 }
2567 }
2568 if (pick == NULL) {
2569 ttyprintf(tp, "empty foreground process group\n");
2570 goto done1;
2571 }
2572
2573 /*
2574 * Pick an interesting LWP (XXX)
2575 *
2576 * pick is held.
2577 */
2578 lp = FIRST_LWP_IN_PROC(pick);
2579 if (lp == NULL) {
2580 PRELE(pick);
2581 ttyprintf(tp, "foreground process without lwp\n");
2582 goto done1;
2583 }
2584
2585 /*
2586 * Figure out what wait/process-state message, and command
2587 * buffer to present
2588 */
2589 /*
2590 * XXX lwp This is a horrible mixture. We need to rework this
2591 * as soon as lwps have their own runnable status.
2592 */
2593 LWPHOLD(lp);
2594 if (pick->p_flags & P_WEXIT)
2595 str = "exiting";
2596 else if (lp->lwp_stat == LSRUN)
2597 str = "running";
2598 else if (pick->p_stat == SIDL)
2599 str = "spawning";
2600 else if (lp->lwp_wmesg) /* lwp_thread must not be NULL */
2601 str = lp->lwp_wmesg;
2602 else
2603 str = "iowait";
2604
2605 ksnprintf(buf, sizeof(buf), "cmd: %s %d [%s]",
2606 pick->p_comm, pick->p_pid, str);
2607
2608 /*
2609 * Calculate cpu usage, percent cpu, and cmsz. Note that
2610 * 'pick' becomes invalid the moment we exit the critical
2611 * section.
2612 */
2613 if (lp->lwp_thread && (pick->p_flags & P_SWAPPEDOUT) == 0)
2614 calcru_proc(pick, &ru);
2615
2616 pctcpu = (lp->lwp_pctcpu * 10000 + FSCALE / 2) >> FSHIFT;
2617
2618 LWPRELE(lp);
2619
2620 /*
2621 * NOTE: vmspace should be protected from destruction by the
2622 * combination of pg_token and the fact that we are not
2623 * flagged as a zombie.
2624 */
2625 if (pick->p_stat == SIDL || pick->p_stat == SZOMB) {
2626 vmsz = 0;
2627 } else if ((vm = pick->p_vmspace) == NULL) {
2628 vmsz = 0;
2629 } else {
2630 vmspace_hold(vm);
2631 vmsz = pgtok(vmspace_resident_count(vm));
2632 vmspace_drop(vm);
2633 }
2634 PRELE(pick);
2635
2636 /*
2637 * Dump the output
2638 */
2639 ttyprintf(tp, " %s ",
2640 buf);
2641 ttyprintf(tp, "%ld.%02ldu ",
2642 ru.ru_utime.tv_sec, ru.ru_utime.tv_usec / 10000);
2643 ttyprintf(tp, "%ld.%02lds ",
2644 ru.ru_stime.tv_sec, ru.ru_stime.tv_usec / 10000);
2645 ttyprintf(tp, "%d%% %ldk\n",
2646 pctcpu / 100, vmsz);
2647
2648 done1:
2649 lwkt_reltoken(&pgrp->pg_token);
2650 pgrel(pgrp);
2651 done2:
2652 tp->t_rocount = 0; /* so pending input will be retyped if BS */
2653 lwkt_reltoken(&tty_token);
2654 }
2655
2656 /*
2657 * Returns 1 if p2 is "better" than p1
2658 *
2659 * The algorithm for picking the "interesting" process is thus:
2660 *
2661 * 1) Only foreground processes are eligible - implied.
2662 * 2) Runnable processes are favored over anything else. The runner
2663 * with the highest cpu utilization is picked (p_cpticks). Ties are
2664 * broken by picking the highest pid.
2665 * 3) The sleeper with the shortest sleep time is next. With ties,
2666 * we pick out just "short-term" sleepers (LWP_SINTR == 0).
2667 * 4) Further ties are broken by picking the highest pid.
2668 *
2669 * NOTE: must be called with p1 and p2 held.
2670 */
2671 #define ISRUN(lp) ((lp)->lwp_stat == LSRUN)
2672 #define TESTAB(a, b) ((a)<<1 | (b))
2673 #define ONLYA 2
2674 #define ONLYB 1
2675 #define BOTH 3
2676
2677 static int
2678 proc_compare(struct proc *p1, struct proc *p2)
2679 {
2680 struct lwp *lp1, *lp2;
2681 int res;
2682
2683 if (p1 == NULL)
2684 return (1);
2685 if (lwkt_trytoken(&p1->p_token) == 0)
2686 return (1);
2687 if (lwkt_trytoken(&p2->p_token) == 0) {
2688 lwkt_reltoken(&p1->p_token);
2689 return (0);
2690 }
2691
2692 /*
2693 * weed out zombies
2694 */
2695 switch (TESTAB(p1->p_stat == SZOMB, p2->p_stat == SZOMB)) {
2696 case ONLYA:
2697 res = 1;
2698 goto done;
2699 case ONLYB:
2700 res = 0;
2701 goto done;
2702 case BOTH:
2703 res = (p2->p_pid > p1->p_pid); /* tie - return highest pid */
2704 goto done;
2705 default:
2706 break;
2707 }
2708
2709 /* XXX choose the best lwp? */
2710 lp1 = FIRST_LWP_IN_PROC(p1);
2711 lp2 = FIRST_LWP_IN_PROC(p2);
2712
2713 /*
2714 * Favor one with LWPs verses one that has none (is exiting).
2715 */
2716 if (lp1 == NULL) {
2717 res = 1;
2718 goto done;
2719 }
2720 if (lp2 == NULL) {
2721 res = 0;
2722 goto done;
2723 }
2724
2725 /*
2726 * see if at least one of them is runnable
2727 */
2728 switch (TESTAB(ISRUN(lp1), ISRUN(lp2))) {
2729 case ONLYA:
2730 res = 0;
2731 goto done;
2732 case ONLYB:
2733 res = 1;
2734 goto done;
2735 case BOTH:
2736 /*
2737 * tie - favor one with highest recent cpu utilization
2738 */
2739 if (lp2->lwp_cpticks > lp1->lwp_cpticks)
2740 res = 1;
2741 else if (lp1->lwp_cpticks > lp2->lwp_cpticks)
2742 res = 0;
2743 else
2744 res = (p2->p_pid > p1->p_pid); /* tie - ret highest */
2745 goto done;
2746 default:
2747 break;
2748 }
2749
2750 /*
2751 * Pick the one with the smallest sleep time
2752 */
2753 if (lp2->lwp_slptime > lp1->lwp_slptime) {
2754 res = 0;
2755 goto done;
2756 }
2757 if (lp1->lwp_slptime > lp2->lwp_slptime) {
2758 res = 1;
2759 goto done;
2760 }
2761
2762 /*
2763 * Favor one sleeping in a non-interruptible sleep
2764 */
2765 if ((lp1->lwp_flags & LWP_SINTR) && (lp2->lwp_flags & LWP_SINTR) == 0)
2766 res = 1;
2767 else
2768 if ((lp2->lwp_flags & LWP_SINTR) && (lp1->lwp_flags & LWP_SINTR) == 0)
2769 res = 0;
2770 else
2771 res = (p2->p_pid > p1->p_pid); /* tie - return highest pid */
2772 /* fall through */
2773
2774 done:
2775 lwkt_reltoken(&p2->p_token);
2776 lwkt_reltoken(&p1->p_token);
2777 return (res);
2778 }
2779
2780 /*
2781 * Output char to tty; console putchar style.
2782 */
2783 int
2784 tputchar(int c, struct tty *tp)
2785 {
2786 crit_enter();
2787 lwkt_gettoken(&tty_token);
2788 if (!ISSET(tp->t_state, TS_CONNECTED)) {
2789 lwkt_reltoken(&tty_token);
2790 crit_exit();
2791 return (-1);
2792 }
2793 if (c == '\n')
2794 (void)ttyoutput('\r', tp);
2795 (void)ttyoutput(c, tp);
2796 ttstart(tp);
2797 lwkt_reltoken(&tty_token);
2798 crit_exit();
2799 return (0);
2800 }
2801
2802 /*
2803 * Sleep on chan, returning ERESTART if tty changed while we napped and
2804 * returning any errors (e.g. EINTR/EWOULDBLOCK) reported by tsleep. If
2805 * the tty is revoked, restarting a pending call will redo validation done
2806 * at the start of the call.
2807 */
2808 int
2809 ttysleep(struct tty *tp, void *chan, int slpflags, char *wmesg, int timo)
2810 {
2811 int error;
2812 int gen;
2813
2814 gen = tp->t_gen;
2815 error = tsleep(chan, slpflags, wmesg, timo);
2816 if (error)
2817 return (error);
2818 return (tp->t_gen == gen ? 0 : ERESTART);
2819 }
2820
2821 /*
2822 * Revoke a tty.
2823 *
2824 * We bump the gen to force any ttysleep()'s to return with ERESTART
2825 * and flush the tty. The related fp's should already have been
2826 * replaced so the tty will close when the last references on the
2827 * original fp's go away.
2828 */
2829 int
2830 ttyrevoke(struct dev_revoke_args *ap)
2831 {
2832 struct tty *tp;
2833
2834 lwkt_gettoken(&tty_token);
2835 tp = ap->a_head.a_dev->si_tty;
2836 tp->t_gen++;
2837 ttyflush(tp, FREAD | FWRITE);
2838 wakeup(TSA_CARR_ON(tp));
2839 ttwakeup(tp);
2840 ttwwakeup(tp);
2841 lwkt_reltoken(&tty_token);
2842 return (0);
2843 }
2844
2845 /*
2846 * Allocate a tty struct. Clists in the struct will be allocated by
2847 * ttyopen().
2848 */
2849 struct tty *
2850 ttymalloc(struct tty *tp)
2851 {
2852
2853 if (tp) {
2854 return(tp);
2855 }
2856 tp = kmalloc(sizeof *tp, M_TTYS, M_WAITOK|M_ZERO);
2857 ttyregister(tp);
2858 return (tp);
2859 }
2860
2861 void
2862 ttyunregister(struct tty *tp)
2863 {
2864 lwkt_gettoken(&tty_token);
2865 KKASSERT(ISSET(tp->t_state, TS_REGISTERED));
2866 CLR(tp->t_state, TS_REGISTERED);
2867 TAILQ_REMOVE(&tty_list, tp, t_list);
2868 lwkt_reltoken(&tty_token);
2869 }
2870
2871 void
2872 ttyregister(struct tty *tp)
2873 {
2874 lwkt_gettoken(&tty_token);
2875 KKASSERT(!ISSET(tp->t_state, TS_REGISTERED));
2876 SET(tp->t_state, TS_REGISTERED);
2877 TAILQ_INSERT_HEAD(&tty_list, tp, t_list);
2878 lwkt_reltoken(&tty_token);
2879 }
2880
2881 static int
2882 sysctl_kern_ttys(SYSCTL_HANDLER_ARGS)
2883 {
2884 int error;
2885 struct tty *tp;
2886 struct tty t;
2887 struct tty marker;
2888
2889 bzero(&marker, sizeof(marker));
2890 marker.t_state = TS_MARKER;
2891 error = 0;
2892
2893 lwkt_gettoken(&tty_token);
2894
2895 TAILQ_INSERT_HEAD(&tty_list, &marker, t_list);
2896 while ((tp = TAILQ_NEXT(&marker, t_list)) != NULL) {
2897 TAILQ_REMOVE(&tty_list, &marker, t_list);
2898 TAILQ_INSERT_AFTER(&tty_list, tp, &marker, t_list);
2899 if (tp->t_state & TS_MARKER)
2900 continue;
2901 t = *tp;
2902 if (t.t_dev)
2903 t.t_dev = (cdev_t)(uintptr_t)dev2udev(t.t_dev);
2904 error = SYSCTL_OUT(req, (caddr_t)&t, sizeof(t));
2905 if (error)
2906 break;
2907 }
2908 TAILQ_REMOVE(&tty_list, &marker, t_list);
2909 lwkt_reltoken(&tty_token);
2910 return (error);
2911 }
2912
2913 SYSCTL_PROC(_kern, OID_AUTO, ttys, CTLTYPE_OPAQUE|CTLFLAG_RD,
2914 0, 0, sysctl_kern_ttys, "S,tty", "All struct ttys");
2915
2916 void
2917 nottystop(struct tty *tp, int rw)
2918 {
2919 return;
2920 }
2921
2922 int
2923 ttyread(struct dev_read_args *ap)
2924 {
2925 struct tty *tp;
2926 int ret;
2927
2928 tp = ap->a_head.a_dev->si_tty;
2929 if (tp == NULL)
2930 return (ENODEV);
2931 lwkt_gettoken(&tty_token);
2932 ret = ((*linesw[tp->t_line].l_read)(tp, ap->a_uio, ap->a_ioflag));
2933 lwkt_reltoken(&tty_token);
2934
2935 return ret;
2936 }
2937
2938 int
2939 ttywrite(struct dev_write_args *ap)
2940 {
2941 struct tty *tp;
2942 int ret;
2943
2944 tp = ap->a_head.a_dev->si_tty;
2945 if (tp == NULL)
2946 return (ENODEV);
2947 lwkt_gettoken(&tty_token);
2948 ret = ((*linesw[tp->t_line].l_write)(tp, ap->a_uio, ap->a_ioflag));
2949 lwkt_reltoken(&tty_token);
2950
2951 return ret;
2952 }
DragonFly BSD