?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
installer: Re-add the TEST_DEV command which was removed accidentally.
[dragonfly.git] / sys / kern / tty.c
blobc252227c1183d1d5d00f552bd6b0fb4726b04d81
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 $
40 * $DragonFly: src/sys/kern/tty.c,v 1.46 2008/09/10 09:50:09 y0netan1 Exp $
41 */
42
43 /*-
44 * TODO:
45 * o Fix races for sending the start char in ttyflush().
46 * o Handle inter-byte timeout for "MIN > 0, TIME > 0" in ttyselect().
47 * With luck, there will be MIN chars before select() returns().
48 * o Handle CLOCAL consistently for ptys. Perhaps disallow setting it.
49 * o Don't allow input in TS_ZOMBIE case. It would be visible through
50 * FIONREAD.
51 * o Do the new sio locking stuff here and use it to avoid special
52 * case for EXTPROC?
53 * o Lock PENDIN too?
54 * o Move EXTPROC and/or PENDIN to t_state?
55 * o Wrap most of ttioctl in spltty/splx.
56 * o Implement TIOCNOTTY or remove it from <sys/ioctl.h>.
57 * o Send STOP if IXOFF is toggled off while TS_TBLOCK is set.
58 * o Don't allow certain termios flags to affect disciplines other
59 * than TTYDISC. Cancel their effects before switch disciplines
60 * and ignore them if they are set while we are in another
61 * discipline.
62 * o Now that historical speed conversions are handled here, don't
63 * do them in drivers.
64 * o Check for TS_CARR_ON being set while everything is closed and not
65 * waiting for carrier. TS_CARR_ON isn't cleared if nothing is open,
66 * so it would live until the next open even if carrier drops.
67 * o Restore TS_WOPEN since it is useful in pstat. It must be cleared
68 * only when _all_ openers leave open().
69 */
70
71 #include "opt_compat.h"
72 #include "opt_uconsole.h"
73
74 #include <sys/param.h>
75 #include <sys/systm.h>
76 #include <sys/filio.h>
77 #if defined(COMPAT_43) || defined(COMPAT_SUNOS)
78 #include <sys/ioctl_compat.h>
79 #endif
80 #include <sys/proc.h>
81 #include <sys/priv.h>
82 #define TTYDEFCHARS
83 #include <sys/tty.h>
84 #include <sys/clist.h>
85 #undef TTYDEFCHARS
86 #include <sys/fcntl.h>
87 #include <sys/conf.h>
88 #include <sys/dkstat.h>
89 #include <sys/poll.h>
90 #include <sys/kernel.h>
91 #include <sys/vnode.h>
92 #include <sys/signalvar.h>
93 #include <sys/signal2.h>
94 #include <sys/resourcevar.h>
95 #include <sys/malloc.h>
96 #include <sys/filedesc.h>
97 #include <sys/sysctl.h>
98 #include <sys/thread2.h>
99
100 #include <vm/vm.h>
101 #include <sys/lock.h>
102 #include <vm/pmap.h>
103 #include <vm/vm_map.h>
104
105 MALLOC_DEFINE(M_TTYS, "ttys", "tty data structures");
106
107 static int proc_compare (struct proc *p1, struct proc *p2);
108 static int ttnread (struct tty *tp);
109 static void ttyecho (int c, struct tty *tp);
110 static int ttyoutput (int c, struct tty *tp);
111 static void ttypend (struct tty *tp);
112 static void ttyretype (struct tty *tp);
113 static void ttyrub (int c, struct tty *tp);
114 static void ttyrubo (struct tty *tp, int cnt);
115 static void ttyunblock (struct tty *tp);
116 static int ttywflush (struct tty *tp);
117 static int filt_ttyread (struct knote *kn, long hint);
118 static void filt_ttyrdetach (struct knote *kn);
119 static int filt_ttywrite (struct knote *kn, long hint);
120 static void filt_ttywdetach (struct knote *kn);
121
122 /*
123 * Table with character classes and parity. The 8th bit indicates parity,
124 * the 7th bit indicates the character is an alphameric or underscore (for
125 * ALTWERASE), and the low 6 bits indicate delay type. If the low 6 bits
126 * are 0 then the character needs no special processing on output; classes
127 * other than 0 might be translated or (not currently) require delays.
128 */
129 #define E 0x00 /* Even parity. */
130 #define O 0x80 /* Odd parity. */
131 #define PARITY(c) (char_type[c] & O)
132
133 #define ALPHA 0x40 /* Alpha or underscore. */
134 #define ISALPHA(c) (char_type[(c) & TTY_CHARMASK] & ALPHA)
135
136 #define CCLASSMASK 0x3f
137 #define CCLASS(c) (char_type[c] & CCLASSMASK)
138
139 #define BS BACKSPACE
140 #define CC CONTROL
141 #define CR RETURN
142 #define NA ORDINARY | ALPHA
143 #define NL NEWLINE
144 #define NO ORDINARY
145 #define TB TAB
146 #define VT VTAB
147
148 static u_char const char_type[] = {
149 E|CC, O|CC, O|CC, E|CC, O|CC, E|CC, E|CC, O|CC, /* nul - bel */
150 O|BS, E|TB, E|NL, O|CC, E|VT, O|CR, O|CC, E|CC, /* bs - si */
151 O|CC, E|CC, E|CC, O|CC, E|CC, O|CC, O|CC, E|CC, /* dle - etb */
152 E|CC, O|CC, O|CC, E|CC, O|CC, E|CC, E|CC, O|CC, /* can - us */
153 O|NO, E|NO, E|NO, O|NO, E|NO, O|NO, O|NO, E|NO, /* sp - ' */
154 E|NO, O|NO, O|NO, E|NO, O|NO, E|NO, E|NO, O|NO, /* ( - / */
155 E|NA, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* 0 - 7 */
156 O|NA, E|NA, E|NO, O|NO, E|NO, O|NO, O|NO, E|NO, /* 8 - ? */
157 O|NO, E|NA, E|NA, O|NA, E|NA, O|NA, O|NA, E|NA, /* @ - G */
158 E|NA, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* H - O */
159 E|NA, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* P - W */
160 O|NA, E|NA, E|NA, O|NO, E|NO, O|NO, O|NO, O|NA, /* X - _ */
161 E|NO, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* ` - g */
162 O|NA, E|NA, E|NA, O|NA, E|NA, O|NA, O|NA, E|NA, /* h - o */
163 O|NA, E|NA, E|NA, O|NA, E|NA, O|NA, O|NA, E|NA, /* p - w */
164 E|NA, O|NA, O|NA, E|NO, O|NO, E|NO, E|NO, O|CC, /* x - del */
165 /*
166 * Meta chars; should be settable per character set;
167 * for now, treat them all as normal characters.
168 */
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 NA, NA, NA, NA, NA, NA, NA, NA,
185 };
186 #undef BS
187 #undef CC
188 #undef CR
189 #undef NA
190 #undef NL
191 #undef NO
192 #undef TB
193 #undef VT
194
195 /* Macros to clear/set/test flags. */
196 #define SET(t, f) (t) |= (f)
197 #define CLR(t, f) (t) &= ~(f)
198 #define ISSET(t, f) ((t) & (f))
199
200 #undef MAX_INPUT /* XXX wrong in <sys/syslimits.h> */
201 #define MAX_INPUT TTYHOG /* XXX limit is usually larger for !ICANON */
202
203 uint64_t tk_nin;
204 SYSCTL_OPAQUE(_kern, OID_AUTO, tk_nin, CTLFLAG_RD, &tk_nin, sizeof(tk_nin),
205 "LU", "TTY input statistic");
206 uint64_t tk_nout;
207 SYSCTL_OPAQUE(_kern, OID_AUTO, tk_nout, CTLFLAG_RD, &tk_nout, sizeof(tk_nout),
208 "LU", "TTY output statistic");
209 uint64_t tk_rawcc;
210
211 /*
212 * list of struct tty where pstat(8) can pick it up with sysctl
213 */
214 static SLIST_HEAD(, tty) tty_list;
215
216 /*
217 * Initial open of tty, or (re)entry to standard tty line discipline.
218 */
219 int
220 ttyopen(cdev_t device, struct tty *tp)
221 {
222 crit_enter();
223 tp->t_dev = device;
224 if (!ISSET(tp->t_state, TS_ISOPEN)) {
225 SET(tp->t_state, TS_ISOPEN);
226 if (ISSET(tp->t_cflag, CLOCAL))
227 SET(tp->t_state, TS_CONNECTED);
228 bzero(&tp->t_winsize, sizeof(tp->t_winsize));
229 }
230 ttsetwater(tp);
231 crit_exit();
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.
239 *
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 */
244 int
245 ttyclose(struct tty *tp)
246 {
247 funsetown(tp->t_sigio);
248 crit_enter();
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;
259 ttyclearsession(tp);
260 tp->t_state = 0;
261 crit_exit();
262 return (0);
263 }
264
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 */
275 void
276 ttyclearsession(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 {
288 kprintf("ttyclearsession: warning: sp->s_ttyp != tp "
289 "%p/%p\n", sp->s_ttyp, tp);
290 }
291 #endif
292 }
293 }
294
295 /*
296 * Release the tty vnode association for a session. This is the
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.
300 *
301 * If dorevoke is non-zero, the session is also revoked. We have to
302 * close the vnode if VCTTYISOPEN is set.
303 */
304 void
305 ttyclosesession(struct session *sp, int dorevoke)
306 {
307 struct vnode *vp;
308
309 retry:
310 /*
311 * There may not be a controlling terminal or it may have been closed
312 * out from under us.
313 */
314 if ((vp = sp->s_ttyvp) == NULL)
315 return;
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) {
341 vclrflags(vp, VCTTYISOPEN);
342 VOP_CLOSE(vp, FREAD|FWRITE);
343 }
344 if (dorevoke)
345 VOP_REVOKE(vp, REVOKEALL);
346 vn_unlock(vp);
347 vdrop(vp);
348 } else {
349 sp->s_ttyvp = NULL;
350 }
351 vrele(vp);
352 }
353
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 */
368 int
369 ttyinput(int c, struct tty *tp)
370 {
371 tcflag_t iflag, lflag;
372 cc_t *cc;
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 */
384 if (ISSET(lflag, ICANON))
385 ++tp->t_cancc;
386 else
387 ++tp->t_rawcc;
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)) {
423 parmrk:
424 if (tp->t_rawq.c_cc + tp->t_canq.c_cc >
425 MAX_INPUT - 3)
426 goto input_overflow;
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);
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)
544 ttyrub(clist_unputc(&tp->t_rawq), tp);
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)
555 ttyrub(clist_unputc(&tp->t_rawq), tp);
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 */
576 while ((c = clist_unputc(&tp->t_rawq)) == ' ' || c == '\t')
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);
585 c = clist_unputc(&tp->t_rawq);
586 if (c == -1)
587 goto endcase;
588 if (c == ' ' || c == '\t') {
589 clist_putc(c, &tp->t_rawq);
590 goto endcase;
591 }
592 ctype = ISALPHA(c);
593 /*
594 * erase rest of word
595 */
596 do {
597 ttyrub(c, tp);
598 c = clist_unputc(&tp->t_rawq);
599 if (c == -1)
600 goto endcase;
601 } while (c != ' ' && c != '\t' &&
602 (!ISSET(lflag, ALTWERASE) || ISALPHA(c) == ctype));
603 clist_putc(c, &tp->t_rawq);
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 }
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 }
628 }
629 /*
630 * Check for input buffer overflow
631 */
632 if (tp->t_rawq.c_cc + tp->t_canq.c_cc >= MAX_INPUT) {
633 input_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))
643 clist_putc(0377 | TTY_QUOTE, &tp->t_rawq);
644
645 /*
646 * Put data char in q for user and
647 * wakeup on seeing a line delimiter.
648 */
649 if (clist_putc(c, &tp->t_rawq) >= 0) {
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 }
681 endcase:
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);
688 restartoutput:
689 CLR(tp->t_lflag, FLUSHO);
690 CLR(tp->t_state, TS_TTSTOP);
691 startoutput:
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 */
701 static int
702 ttyoutput(int c, struct tty *tp)
703 {
704 tcflag_t oflag;
705 int col;
706
707 oflag = tp->t_oflag;
708 if (!ISSET(oflag, OPOST)) {
709 if (ISSET(tp->t_lflag, FLUSHO))
710 return (-1);
711 if (clist_putc(c, &tp->t_outq))
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)) {
728 crit_enter(); /* Don't interrupt tabs. */
729 c -= b_to_q(" ", c, &tp->t_outq);
730 tk_nout += c;
731 tp->t_outcc += c;
732 crit_exit();
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++;
747 if (!ISSET(tp->t_lflag, FLUSHO) && clist_putc('\r', &tp->t_outq))
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++;
759 if (!ISSET(tp->t_lflag, FLUSHO) && clist_putc(c, &tp->t_outq))
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 */
794 int
795 ttioctl(struct tty *tp, u_long cmd, void *data, int flag)
796 {
797 struct thread *td = curthread;
798 struct lwp *lp = td->td_lwp;
799 struct proc *p = td->td_proc;
800 int error;
801
802 KKASSERT(p);
803
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) &&
840 !SIGISMEMBER(lp->lwp_sigmask, SIGTTOU)) {
841 if (p->p_pgrp->pg_jobc == 0)
842 return (EIO);
843 pgsignal(p->p_pgrp, SIGTTOU, 1);
844 error = ttysleep(tp, &lbolt, PCATCH, "ttybg1",
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 */
854 crit_enter();
855 if (*(int *)data)
856 SET(tp->t_state, TS_ASYNC);
857 else
858 CLR(tp->t_state, TS_ASYNC);
859 crit_exit();
860 break;
861 case FIONREAD: /* get # bytes to read */
862 crit_enter();
863 *(int *)data = ttnread(tp);
864 crit_exit();
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 */
886 crit_enter();
887 SET(tp->t_state, TS_XCLUDE);
888 crit_exit();
889 break;
890 case TIOCFLUSH: { /* flush buffers */
891 int flags = *(int *)data;
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
906 if ((error = priv_check(td, PRIV_ROOT)) != 0)
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;
935 #ifdef TIOCHPCL
936 case TIOCHPCL: /* hang up on last close */
937 crit_enter();
938 SET(tp->t_cflag, HUPCL);
939 crit_exit();
940 break;
941 #endif
942 case TIOCNXCL: /* reset exclusive use of tty */
943 crit_enter();
944 CLR(tp->t_state, TS_XCLUDE);
945 crit_exit();
946 break;
947 case TIOCOUTQ: /* output queue size */
948 *(int *)data = tp->t_outq.c_cc;
949 break;
950 case TIOCSETA: /* set termios struct */
951 case TIOCSETAW: /* drain output, set */
952 case TIOCSETAF: { /* drn out, fls in, set */
953 struct termios *t = (struct termios *)data;
954
955 if (t->c_ispeed == 0)
956 t->c_ispeed = t->c_ospeed;
957 if (t->c_ispeed == 0)
958 t->c_ispeed = tp->t_ospeed;
959 if (t->c_ispeed == 0)
960 return (EINVAL);
961 crit_enter();
962 if (cmd == TIOCSETAW || cmd == TIOCSETAF) {
963 error = ttywait(tp);
964 if (error) {
965 crit_exit();
966 return (error);
967 }
968 if (cmd == TIOCSETAF)
969 ttyflush(tp, FREAD);
970 }
971 if (!ISSET(t->c_cflag, CIGNORE)) {
972 /*
973 * Set device hardware.
974 */
975 if (tp->t_param && (error = (*tp->t_param)(tp, t))) {
976 crit_exit();
977 return (error);
978 }
979 if (ISSET(t->c_cflag, CLOCAL) &&
980 !ISSET(tp->t_cflag, CLOCAL)) {
981 /*
982 * XXX disconnections would be too hard to
983 * get rid of without this kludge. The only
984 * way to get rid of controlling terminals
985 * is to exit from the session leader.
986 */
987 CLR(tp->t_state, TS_ZOMBIE);
988
989 wakeup(TSA_CARR_ON(tp));
990 ttwakeup(tp);
991 ttwwakeup(tp);
992 }
993 if ((ISSET(tp->t_state, TS_CARR_ON) ||
994 ISSET(t->c_cflag, CLOCAL)) &&
995 !ISSET(tp->t_state, TS_ZOMBIE))
996 SET(tp->t_state, TS_CONNECTED);
997 else
998 CLR(tp->t_state, TS_CONNECTED);
999 tp->t_cflag = t->c_cflag;
1000 tp->t_ispeed = t->c_ispeed;
1001 if (t->c_ospeed != 0)
1002 tp->t_ospeed = t->c_ospeed;
1003 ttsetwater(tp);
1004 }
1005 if (ISSET(t->c_lflag, ICANON) != ISSET(tp->t_lflag, ICANON) &&
1006 cmd != TIOCSETAF) {
1007 if (ISSET(t->c_lflag, ICANON))
1008 SET(tp->t_lflag, PENDIN);
1009 else {
1010 /*
1011 * XXX we really shouldn't allow toggling
1012 * ICANON while we're in a non-termios line
1013 * discipline. Now we have to worry about
1014 * panicing for a null queue.
1015 */
1016 if (tp->t_canq.c_cbreserved > 0 &&
1017 tp->t_rawq.c_cbreserved > 0) {
1018 catq(&tp->t_rawq, &tp->t_canq);
1019 /*
1020 * XXX the queue limits may be
1021 * different, so the old queue
1022 * swapping method no longer works.
1023 */
1024 catq(&tp->t_canq, &tp->t_rawq);
1025 }
1026 CLR(tp->t_lflag, PENDIN);
1027 }
1028 ttwakeup(tp);
1029 }
1030 tp->t_iflag = t->c_iflag;
1031 tp->t_oflag = t->c_oflag;
1032 /*
1033 * Make the EXTPROC bit read only.
1034 */
1035 if (ISSET(tp->t_lflag, EXTPROC))
1036 SET(t->c_lflag, EXTPROC);
1037 else
1038 CLR(t->c_lflag, EXTPROC);
1039 tp->t_lflag = t->c_lflag | ISSET(tp->t_lflag, PENDIN);
1040 if (t->c_cc[VMIN] != tp->t_cc[VMIN] ||
1041 t->c_cc[VTIME] != tp->t_cc[VTIME])
1042 ttwakeup(tp);
1043 bcopy(t->c_cc, tp->t_cc, sizeof(t->c_cc));
1044 crit_exit();
1045 break;
1046 }
1047 case TIOCSETD: { /* set line discipline */
1048 int t = *(int *)data;
1049 cdev_t device = tp->t_dev;
1050
1051 if ((u_int)t >= nlinesw)
1052 return (ENXIO);
1053 if (t != tp->t_line) {
1054 crit_enter();
1055 (*linesw[tp->t_line].l_close)(tp, flag);
1056 error = (*linesw[t].l_open)(device, tp);
1057 if (error) {
1058 (void)(*linesw[tp->t_line].l_open)(device, tp);
1059 crit_exit();
1060 return (error);
1061 }
1062 tp->t_line = t;
1063 crit_exit();
1064 }
1065 break;
1066 }
1067 case TIOCSTART: /* start output, like ^Q */
1068 crit_enter();
1069 if (ISSET(tp->t_state, TS_TTSTOP) ||
1070 ISSET(tp->t_lflag, FLUSHO)) {
1071 CLR(tp->t_lflag, FLUSHO);
1072 CLR(tp->t_state, TS_TTSTOP);
1073 ttstart(tp);
1074 }
1075 crit_exit();
1076 break;
1077 case TIOCSTI: /* simulate terminal input */
1078 if ((flag & FREAD) == 0 && priv_check(td, PRIV_ROOT))
1079 return (EPERM);
1080 if (!isctty(p, tp) && priv_check(td, PRIV_ROOT))
1081 return (EACCES);
1082 crit_enter();
1083 (*linesw[tp->t_line].l_rint)(*(u_char *)data, tp);
1084 crit_exit();
1085 break;
1086 case TIOCSTOP: /* stop output, like ^S */
1087 crit_enter();
1088 if (!ISSET(tp->t_state, TS_TTSTOP)) {
1089 SET(tp->t_state, TS_TTSTOP);
1090 (*tp->t_stop)(tp, 0);
1091 }
1092 crit_exit();
1093 break;
1094 case TIOCSCTTY: /* become controlling tty */
1095 /* Session ctty vnode pointer set in vnode layer. */
1096 if (!SESS_LEADER(p) ||
1097 ((p->p_session->s_ttyvp || tp->t_session) &&
1098 (tp->t_session != p->p_session)))
1099 return (EPERM);
1100 tp->t_session = p->p_session;
1101 tp->t_pgrp = p->p_pgrp;
1102 p->p_session->s_ttyp = tp;
1103 p->p_flag |= P_CONTROLT;
1104 break;
1105 case TIOCSPGRP: { /* set pgrp of tty */
1106 struct pgrp *pgrp = pgfind(*(int *)data);
1107
1108 if (!isctty(p, tp))
1109 return (ENOTTY);
1110 else if (pgrp == NULL || pgrp->pg_session != p->p_session)
1111 return (EPERM);
1112 tp->t_pgrp = pgrp;
1113 break;
1114 }
1115 case TIOCSTAT: /* simulate control-T */
1116 crit_enter();
1117 ttyinfo(tp);
1118 crit_exit();
1119 break;
1120 case TIOCSWINSZ: /* set window size */
1121 if (bcmp((caddr_t)&tp->t_winsize, data,
1122 sizeof (struct winsize))) {
1123 tp->t_winsize = *(struct winsize *)data;
1124 pgsignal(tp->t_pgrp, SIGWINCH, 1);
1125 }
1126 break;
1127 case TIOCSDRAINWAIT:
1128 error = priv_check(td, PRIV_ROOT);
1129 if (error)
1130 return (error);
1131 tp->t_timeout = *(int *)data * hz;
1132 wakeup(TSA_OCOMPLETE(tp));
1133 wakeup(TSA_OLOWAT(tp));
1134 break;
1135 case TIOCGDRAINWAIT:
1136 *(int *)data = tp->t_timeout / hz;
1137 break;
1138 default:
1139 #if defined(COMPAT_43) || defined(COMPAT_SUNOS)
1140 return (ttcompat(tp, cmd, data, flag));
1141 #else
1142 return (ENOIOCTL);
1143 #endif
1144 }
1145 return (0);
1146 }
1147
1148 int
1149 ttypoll(struct dev_poll_args *ap)
1150 {
1151 cdev_t dev = ap->a_head.a_dev;
1152 int events = ap->a_events;
1153 int revents = 0;
1154 struct tty *tp;
1155
1156 tp = dev->si_tty;
1157 /* XXX used to return ENXIO, but that means true! */
1158 if (tp == NULL) {
1159 ap->a_events = (events & (POLLIN | POLLOUT | POLLRDNORM |
1160 POLLWRNORM)) | POLLHUP;
1161 return(0);
1162 }
1163
1164 crit_enter();
1165 if (events & (POLLIN | POLLRDNORM)) {
1166 if (ttnread(tp) > 0 || ISSET(tp->t_state, TS_ZOMBIE))
1167 revents |= events & (POLLIN | POLLRDNORM);
1168 else
1169 selrecord(curthread, &tp->t_rsel);
1170 }
1171 if (events & (POLLOUT | POLLWRNORM)) {
1172 if ((tp->t_outq.c_cc <= tp->t_olowat &&
1173 ISSET(tp->t_state, TS_CONNECTED))
1174 || ISSET(tp->t_state, TS_ZOMBIE))
1175 revents |= events & (POLLOUT | POLLWRNORM);
1176 else
1177 selrecord(curthread, &tp->t_wsel);
1178 }
1179 crit_exit();
1180 ap->a_events = revents;
1181 return (0);
1182 }
1183
1184 static struct filterops ttyread_filtops =
1185 { 1, NULL, filt_ttyrdetach, filt_ttyread };
1186 static struct filterops ttywrite_filtops =
1187 { 1, NULL, filt_ttywdetach, filt_ttywrite };
1188
1189 int
1190 ttykqfilter(struct dev_kqfilter_args *ap)
1191 {
1192 cdev_t dev = ap->a_head.a_dev;
1193 struct knote *kn = ap->a_kn;
1194 struct tty *tp = dev->si_tty;
1195 struct klist *klist;
1196
1197 ap->a_result = 0;
1198 switch (kn->kn_filter) {
1199 case EVFILT_READ:
1200 klist = &tp->t_rsel.si_note;
1201 kn->kn_fop = &ttyread_filtops;
1202 break;
1203 case EVFILT_WRITE:
1204 klist = &tp->t_wsel.si_note;
1205 kn->kn_fop = &ttywrite_filtops;
1206 break;
1207 default:
1208 ap->a_result = 1;
1209 return (0);
1210 }
1211
1212 kn->kn_hook = (caddr_t)dev;
1213
1214 crit_enter();
1215 SLIST_INSERT_HEAD(klist, kn, kn_selnext);
1216 crit_exit();
1217
1218 return (0);
1219 }
1220
1221 static void
1222 filt_ttyrdetach(struct knote *kn)
1223 {
1224 struct tty *tp = ((cdev_t)kn->kn_hook)->si_tty;
1225
1226 crit_enter();
1227 SLIST_REMOVE(&tp->t_rsel.si_note, kn, knote, kn_selnext);
1228 crit_exit();
1229 }
1230
1231 static int
1232 filt_ttyread(struct knote *kn, long hint)
1233 {
1234 struct tty *tp = ((cdev_t)kn->kn_hook)->si_tty;
1235
1236 kn->kn_data = ttnread(tp);
1237 if (ISSET(tp->t_state, TS_ZOMBIE)) {
1238 kn->kn_flags |= EV_EOF;
1239 return (1);
1240 }
1241 return (kn->kn_data > 0);
1242 }
1243
1244 static void
1245 filt_ttywdetach(struct knote *kn)
1246 {
1247 struct tty *tp = ((cdev_t)kn->kn_hook)->si_tty;
1248
1249 crit_enter();
1250 SLIST_REMOVE(&tp->t_wsel.si_note, kn, knote, kn_selnext);
1251 crit_exit();
1252 }
1253
1254 static int
1255 filt_ttywrite(struct knote *kn, long hint)
1256 {
1257 struct tty *tp = ((cdev_t)kn->kn_hook)->si_tty;
1258
1259 kn->kn_data = tp->t_outq.c_cc;
1260 if (ISSET(tp->t_state, TS_ZOMBIE))
1261 return (1);
1262 return (kn->kn_data <= tp->t_olowat &&
1263 ISSET(tp->t_state, TS_CONNECTED));
1264 }
1265
1266 /*
1267 * Must be called while in a critical section.
1268 */
1269 static int
1270 ttnread(struct tty *tp)
1271 {
1272 int nread;
1273
1274 if (ISSET(tp->t_lflag, PENDIN))
1275 ttypend(tp);
1276 nread = tp->t_canq.c_cc;
1277 if (!ISSET(tp->t_lflag, ICANON)) {
1278 nread += tp->t_rawq.c_cc;
1279 if (nread < tp->t_cc[VMIN] && tp->t_cc[VTIME] == 0)
1280 nread = 0;
1281 }
1282 return (nread);
1283 }
1284
1285 /*
1286 * Wait for output to drain.
1287 */
1288 int
1289 ttywait(struct tty *tp)
1290 {
1291 int error;
1292
1293 error = 0;
1294 crit_enter();
1295 while ((tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY)) &&
1296 ISSET(tp->t_state, TS_CONNECTED) && tp->t_oproc) {
1297 (*tp->t_oproc)(tp);
1298 if ((tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY)) &&
1299 ISSET(tp->t_state, TS_CONNECTED)) {
1300 SET(tp->t_state, TS_SO_OCOMPLETE);
1301 error = ttysleep(tp, TSA_OCOMPLETE(tp),
1302 PCATCH, "ttywai",
1303 tp->t_timeout);
1304 if (error) {
1305 if (error == EWOULDBLOCK)
1306 error = EIO;
1307 break;
1308 }
1309 } else
1310 break;
1311 }
1312 if (!error && (tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY)))
1313 error = EIO;
1314 crit_exit();
1315 return (error);
1316 }
1317
1318 /*
1319 * Flush if successfully wait.
1320 */
1321 static int
1322 ttywflush(struct tty *tp)
1323 {
1324 int error;
1325
1326 if ((error = ttywait(tp)) == 0)
1327 ttyflush(tp, FREAD);
1328 return (error);
1329 }
1330
1331 /*
1332 * Flush tty read and/or write queues, notifying anyone waiting.
1333 */
1334 void
1335 ttyflush(struct tty *tp, int rw)
1336 {
1337 crit_enter();
1338 #if 0
1339 again:
1340 #endif
1341 if (rw & FWRITE) {
1342 FLUSHQ(&tp->t_outq);
1343 CLR(tp->t_state, TS_TTSTOP);
1344 }
1345 (*tp->t_stop)(tp, rw);
1346 if (rw & FREAD) {
1347 FLUSHQ(&tp->t_canq);
1348 FLUSHQ(&tp->t_rawq);
1349 CLR(tp->t_lflag, PENDIN);
1350 tp->t_rocount = 0;
1351 tp->t_rocol = 0;
1352 CLR(tp->t_state, TS_LOCAL);
1353 ttwakeup(tp);
1354 if (ISSET(tp->t_state, TS_TBLOCK)) {
1355 if (rw & FWRITE)
1356 FLUSHQ(&tp->t_outq);
1357 ttyunblock(tp);
1358
1359 /*
1360 * Don't let leave any state that might clobber the
1361 * next line discipline (although we should do more
1362 * to send the START char). Not clearing the state
1363 * may have caused the "putc to a clist with no
1364 * reserved cblocks" panic/kprintf.
1365 */
1366 CLR(tp->t_state, TS_TBLOCK);
1367
1368 #if 0 /* forget it, sleeping isn't always safe and we don't know when it is */
1369 if (ISSET(tp->t_iflag, IXOFF)) {
1370 /*
1371 * XXX wait a bit in the hope that the stop
1372 * character (if any) will go out. Waiting
1373 * isn't good since it allows races. This
1374 * will be fixed when the stop character is
1375 * put in a special queue. Don't bother with
1376 * the checks in ttywait() since the timeout
1377 * will save us.
1378 */
1379 SET(tp->t_state, TS_SO_OCOMPLETE);
1380 ttysleep(tp, TSA_OCOMPLETE(tp), 0,
1381 "ttyfls", hz / 10);
1382 /*
1383 * Don't try sending the stop character again.
1384 */
1385 CLR(tp->t_state, TS_TBLOCK);
1386 goto again;
1387 }
1388 #endif
1389 }
1390 }
1391 if (rw & FWRITE) {
1392 FLUSHQ(&tp->t_outq);
1393 ttwwakeup(tp);
1394 }
1395 crit_exit();
1396 }
1397
1398 /*
1399 * Copy in the default termios characters.
1400 */
1401 void
1402 termioschars(struct termios *t)
1403 {
1404
1405 bcopy(ttydefchars, t->c_cc, sizeof t->c_cc);
1406 }
1407
1408 /*
1409 * Old interface.
1410 */
1411 void
1412 ttychars(struct tty *tp)
1413 {
1414
1415 termioschars(&tp->t_termios);
1416 }
1417
1418 /*
1419 * Handle input high water. Send stop character for the IXOFF case. Turn
1420 * on our input flow control bit and propagate the changes to the driver.
1421 * XXX the stop character should be put in a special high priority queue.
1422 */
1423 void
1424 ttyblock(struct tty *tp)
1425 {
1426
1427 SET(tp->t_state, TS_TBLOCK);
1428 if (ISSET(tp->t_iflag, IXOFF) && tp->t_cc[VSTOP] != _POSIX_VDISABLE &&
1429 clist_putc(tp->t_cc[VSTOP], &tp->t_outq) != 0)
1430 CLR(tp->t_state, TS_TBLOCK); /* try again later */
1431 ttstart(tp);
1432 }
1433
1434 /*
1435 * Handle input low water. Send start character for the IXOFF case. Turn
1436 * off our input flow control bit and propagate the changes to the driver.
1437 * XXX the start character should be put in a special high priority queue.
1438 */
1439 static void
1440 ttyunblock(struct tty *tp)
1441 {
1442
1443 CLR(tp->t_state, TS_TBLOCK);
1444 if (ISSET(tp->t_iflag, IXOFF) && tp->t_cc[VSTART] != _POSIX_VDISABLE &&
1445 clist_putc(tp->t_cc[VSTART], &tp->t_outq) != 0)
1446 SET(tp->t_state, TS_TBLOCK); /* try again later */
1447 ttstart(tp);
1448 }
1449
1450 #ifdef notyet
1451 /* Not used by any current (i386) drivers. */
1452 /*
1453 * Restart after an inter-char delay.
1454 */
1455 void
1456 ttrstrt(void *tp_arg)
1457 {
1458 struct tty *tp;
1459
1460 KASSERT(tp_arg != NULL, ("ttrstrt"));
1461
1462 tp = tp_arg;
1463 crit_enter();
1464 CLR(tp->t_state, TS_TIMEOUT);
1465 ttstart(tp);
1466 crit_exit();
1467 }
1468 #endif
1469
1470 int
1471 ttstart(struct tty *tp)
1472 {
1473
1474 if (tp->t_oproc != NULL) /* XXX: Kludge for pty. */
1475 (*tp->t_oproc)(tp);
1476 return (0);
1477 }
1478
1479 /*
1480 * "close" a line discipline
1481 */
1482 int
1483 ttylclose(struct tty *tp, int flag)
1484 {
1485
1486 if (flag & FNONBLOCK || ttywflush(tp))
1487 ttyflush(tp, FREAD | FWRITE);
1488 return (0);
1489 }
1490
1491 /*
1492 * Handle modem control transition on a tty.
1493 * Flag indicates new state of carrier.
1494 * Returns 0 if the line should be turned off, otherwise 1.
1495 */
1496 int
1497 ttymodem(struct tty *tp, int flag)
1498 {
1499
1500 if (ISSET(tp->t_state, TS_CARR_ON) && ISSET(tp->t_cflag, MDMBUF)) {
1501 /*
1502 * MDMBUF: do flow control according to carrier flag
1503 * XXX TS_CAR_OFLOW doesn't do anything yet. TS_TTSTOP
1504 * works if IXON and IXANY are clear.
1505 */
1506 if (flag) {
1507 CLR(tp->t_state, TS_CAR_OFLOW);
1508 CLR(tp->t_state, TS_TTSTOP);
1509 ttstart(tp);
1510 } else if (!ISSET(tp->t_state, TS_CAR_OFLOW)) {
1511 SET(tp->t_state, TS_CAR_OFLOW);
1512 SET(tp->t_state, TS_TTSTOP);
1513 (*tp->t_stop)(tp, 0);
1514 }
1515 } else if (flag == 0) {
1516 /*
1517 * Lost carrier.
1518 */
1519 CLR(tp->t_state, TS_CARR_ON);
1520 if (ISSET(tp->t_state, TS_ISOPEN) &&
1521 !ISSET(tp->t_cflag, CLOCAL)) {
1522 SET(tp->t_state, TS_ZOMBIE);
1523 CLR(tp->t_state, TS_CONNECTED);
1524 if (tp->t_session && tp->t_session->s_leader)
1525 ksignal(tp->t_session->s_leader, SIGHUP);
1526 ttyflush(tp, FREAD | FWRITE);
1527 return (0);
1528 }
1529 } else {
1530 /*
1531 * Carrier now on.
1532 */
1533 SET(tp->t_state, TS_CARR_ON);
1534 if (!ISSET(tp->t_state, TS_ZOMBIE))
1535 SET(tp->t_state, TS_CONNECTED);
1536 wakeup(TSA_CARR_ON(tp));
1537 ttwakeup(tp);
1538 ttwwakeup(tp);
1539 }
1540 return (1);
1541 }
1542
1543 /*
1544 * Reinput pending characters after state switch
1545 * call from a critical section.
1546 */
1547 static void
1548 ttypend(struct tty *tp)
1549 {
1550 struct clist tq;
1551 int c;
1552
1553 CLR(tp->t_lflag, PENDIN);
1554 SET(tp->t_state, TS_TYPEN);
1555 /*
1556 * XXX this assumes too much about clist internals. It may even
1557 * fail if the cblock slush pool is empty. We can't allocate more
1558 * cblocks here because we are called from an interrupt handler
1559 * and clist_alloc_cblocks() can wait.
1560 */
1561 tq = tp->t_rawq;
1562 bzero(&tp->t_rawq, sizeof tp->t_rawq);
1563 tp->t_rawq.c_cbmax = tq.c_cbmax;
1564 tp->t_rawq.c_cbreserved = tq.c_cbreserved;
1565 while ((c = clist_getc(&tq)) >= 0)
1566 ttyinput(c, tp);
1567 CLR(tp->t_state, TS_TYPEN);
1568 }
1569
1570 /*
1571 * Process a read call on a tty device.
1572 */
1573 int
1574 ttread(struct tty *tp, struct uio *uio, int flag)
1575 {
1576 struct clist *qp;
1577 int c;
1578 tcflag_t lflag;
1579 cc_t *cc = tp->t_cc;
1580 struct proc *pp;
1581 struct lwp *lp;
1582 int first, error = 0;
1583 int has_stime = 0, last_cc = 0;
1584 long slp = 0; /* XXX this should be renamed `timo'. */
1585 struct timeval stime;
1586
1587 lp = curthread->td_lwp;
1588
1589 loop:
1590 crit_enter();
1591 lflag = tp->t_lflag;
1592 /*
1593 * take pending input first
1594 */
1595 if (ISSET(lflag, PENDIN)) {
1596 ttypend(tp);
1597 splz(); /* reduce latency */
1598 lflag = tp->t_lflag; /* XXX ttypend() clobbers it */
1599 }
1600
1601 /*
1602 * Hang process if it's in the background.
1603 */
1604 if ((pp = curproc) && isbackground(pp, tp)) {
1605 crit_exit();
1606 if (SIGISMEMBER(pp->p_sigignore, SIGTTIN) ||
1607 SIGISMEMBER(lp->lwp_sigmask, SIGTTIN) ||
1608 (pp->p_flag & P_PPWAIT) || pp->p_pgrp->pg_jobc == 0)
1609 return (EIO);
1610 pgsignal(pp->p_pgrp, SIGTTIN, 1);
1611 error = ttysleep(tp, &lbolt, PCATCH, "ttybg2", 0);
1612 if (error)
1613 return (error);
1614 goto loop;
1615 }
1616
1617 if (ISSET(tp->t_state, TS_ZOMBIE)) {
1618 crit_exit();
1619 return (0); /* EOF */
1620 }
1621
1622 /*
1623 * If canonical, use the canonical queue,
1624 * else use the raw queue.
1625 *
1626 * (should get rid of clists...)
1627 */
1628 qp = ISSET(lflag, ICANON) ? &tp->t_canq : &tp->t_rawq;
1629
1630 if (flag & IO_NDELAY) {
1631 if (qp->c_cc > 0)
1632 goto read;
1633 if (!ISSET(lflag, ICANON) && cc[VMIN] == 0) {
1634 crit_exit();
1635 return (0);
1636 }
1637 crit_exit();
1638 return (EWOULDBLOCK);
1639 }
1640 if (!ISSET(lflag, ICANON)) {
1641 int m = cc[VMIN];
1642 long t = cc[VTIME];
1643 struct timeval timecopy;
1644
1645 /*
1646 * Check each of the four combinations.
1647 * (m > 0 && t == 0) is the normal read case.
1648 * It should be fairly efficient, so we check that and its
1649 * companion case (m == 0 && t == 0) first.
1650 * For the other two cases, we compute the target sleep time
1651 * into slp.
1652 */
1653 if (t == 0) {
1654 if (qp->c_cc < m)
1655 goto sleep;
1656 if (qp->c_cc > 0)
1657 goto read;
1658
1659 /* m, t and qp->c_cc are all 0. 0 is enough input. */
1660 crit_exit();
1661 return (0);
1662 }
1663 t *= 100000; /* time in us */
1664 #define diff(t1, t2) (((t1).tv_sec - (t2).tv_sec) * 1000000 + \
1665 ((t1).tv_usec - (t2).tv_usec))
1666 if (m > 0) {
1667 if (qp->c_cc <= 0)
1668 goto sleep;
1669 if (qp->c_cc >= m)
1670 goto read;
1671 getmicrotime(&timecopy);
1672 if (!has_stime) {
1673 /* first character, start timer */
1674 has_stime = 1;
1675 stime = timecopy;
1676 slp = t;
1677 } else if (qp->c_cc > last_cc) {
1678 /* got a character, restart timer */
1679 stime = timecopy;
1680 slp = t;
1681 } else {
1682 /* nothing, check expiration */
1683 slp = t - diff(timecopy, stime);
1684 if (slp <= 0)
1685 goto read;
1686 }
1687 last_cc = qp->c_cc;
1688 } else { /* m == 0 */
1689 if (qp->c_cc > 0)
1690 goto read;
1691 getmicrotime(&timecopy);
1692 if (!has_stime) {
1693 has_stime = 1;
1694 stime = timecopy;
1695 slp = t;
1696 } else {
1697 slp = t - diff(timecopy, stime);
1698 if (slp <= 0) {
1699 /* Timed out, but 0 is enough input. */
1700 crit_exit();
1701 return (0);
1702 }
1703 }
1704 }
1705 #undef diff
1706 /*
1707 * Rounding down may make us wake up just short
1708 * of the target, so we round up.
1709 * The formula is ceiling(slp * hz/1000000).
1710 * 32-bit arithmetic is enough for hz < 169.
1711 * XXX see tvtohz() for how to avoid overflow if hz
1712 * is large (divide by `tick' and/or arrange to
1713 * use tvtohz() if hz is large).
1714 */
1715 slp = (long) (((u_long)slp * hz) + 999999) / 1000000;
1716 goto sleep;
1717 }
1718 if (qp->c_cc <= 0) {
1719 sleep:
1720 /*
1721 * There is no input, or not enough input and we can block.
1722 */
1723 error = ttysleep(tp, TSA_HUP_OR_INPUT(tp), PCATCH,
1724 ISSET(tp->t_state, TS_CONNECTED) ?
1725 "ttyin" : "ttyhup", (int)slp);
1726 crit_exit();
1727 if (error == EWOULDBLOCK)
1728 error = 0;
1729 else if (error)
1730 return (error);
1731 /*
1732 * XXX what happens if another process eats some input
1733 * while we are asleep (not just here)? It would be
1734 * safest to detect changes and reset our state variables
1735 * (has_stime and last_cc).
1736 */
1737 slp = 0;
1738 goto loop;
1739 }
1740 read:
1741 crit_exit();
1742 /*
1743 * Input present, check for input mapping and processing.
1744 */
1745 first = 1;
1746 if (ISSET(lflag, ICANON | ISIG))
1747 goto slowcase;
1748 for (;;) {
1749 char ibuf[IBUFSIZ];
1750 int icc;
1751
1752 icc = imin(uio->uio_resid, IBUFSIZ);
1753 icc = q_to_b(qp, ibuf, icc);
1754 if (icc <= 0) {
1755 if (first)
1756 goto loop;
1757 break;
1758 }
1759 error = uiomove(ibuf, icc, uio);
1760 /*
1761 * XXX if there was an error then we should ungetc() the
1762 * unmoved chars and reduce icc here.
1763 */
1764 if (error)
1765 break;
1766 if (uio->uio_resid == 0)
1767 break;
1768 first = 0;
1769 }
1770 goto out;
1771 slowcase:
1772 for (;;) {
1773 c = clist_getc(qp);
1774 if (c < 0) {
1775 if (first)
1776 goto loop;
1777 break;
1778 }
1779 /*
1780 * delayed suspend (^Y)
1781 */
1782 if (CCEQ(cc[VDSUSP], c) &&
1783 ISSET(lflag, IEXTEN | ISIG) == (IEXTEN | ISIG)) {
1784 pgsignal(tp->t_pgrp, SIGTSTP, 1);
1785 if (first) {
1786 error = ttysleep(tp, &lbolt, PCATCH,
1787 "ttybg3", 0);
1788 if (error)
1789 break;
1790 goto loop;
1791 }
1792 break;
1793 }
1794 /*
1795 * Interpret EOF only in canonical mode.
1796 */
1797 if (CCEQ(cc[VEOF], c) && ISSET(lflag, ICANON))
1798 break;
1799 /*
1800 * Give user character.
1801 */
1802 error = ureadc(c, uio);
1803 if (error)
1804 /* XXX should ungetc(c, qp). */
1805 break;
1806 if (uio->uio_resid == 0)
1807 break;
1808 /*
1809 * In canonical mode check for a "break character"
1810 * marking the end of a "line of input".
1811 */
1812 if (ISSET(lflag, ICANON) && TTBREAKC(c, lflag))
1813 break;
1814 first = 0;
1815 }
1816
1817 out:
1818 /*
1819 * Look to unblock input now that (presumably)
1820 * the input queue has gone down.
1821 */
1822 crit_enter();
1823 if (ISSET(tp->t_state, TS_TBLOCK) &&
1824 tp->t_rawq.c_cc + tp->t_canq.c_cc <= tp->t_ilowat)
1825 ttyunblock(tp);
1826 crit_exit();
1827
1828 return (error);
1829 }
1830
1831 /*
1832 * Check the output queue on tp for space for a kernel message (from uprintf
1833 * or tprintf). Allow some space over the normal hiwater mark so we don't
1834 * lose messages due to normal flow control, but don't let the tty run amok.
1835 * Sleeps here are not interruptible, but we return prematurely if new signals
1836 * arrive.
1837 */
1838 int
1839 ttycheckoutq(struct tty *tp, int wait)
1840 {
1841 struct lwp *lp = curthread->td_lwp;
1842 int hiwat;
1843 sigset_t oldset, newset;
1844
1845 hiwat = tp->t_ohiwat;
1846 SIGEMPTYSET(oldset);
1847 SIGEMPTYSET(newset);
1848 crit_enter();
1849 if (wait)
1850 oldset = lwp_sigpend(lp);
1851 if (tp->t_outq.c_cc > hiwat + OBUFSIZ + 100) {
1852 while (tp->t_outq.c_cc > hiwat) {
1853 ttstart(tp);
1854 if (tp->t_outq.c_cc <= hiwat)
1855 break;
1856 if (wait)
1857 newset = lwp_sigpend(lp);
1858 if (!wait || SIGSETNEQ(oldset, newset)) {
1859 crit_exit();
1860 return (0);
1861 }
1862 SET(tp->t_state, TS_SO_OLOWAT);
1863 tsleep(TSA_OLOWAT(tp), 0, "ttoutq", hz);
1864 }
1865 }
1866 crit_exit();
1867 return (1);
1868 }
1869
1870 /*
1871 * Process a write call on a tty device.
1872 */
1873 int
1874 ttwrite(struct tty *tp, struct uio *uio, int flag)
1875 {
1876 char *cp = NULL;
1877 int cc, ce;
1878 struct proc *pp;
1879 struct lwp *lp;
1880 int i, hiwat, cnt, error;
1881 char obuf[OBUFSIZ];
1882
1883 lp = curthread->td_lwp;
1884 hiwat = tp->t_ohiwat;
1885 cnt = uio->uio_resid;
1886 error = 0;
1887 cc = 0;
1888 loop:
1889 crit_enter();
1890 if (ISSET(tp->t_state, TS_ZOMBIE)) {
1891 crit_exit();
1892 if (uio->uio_resid == cnt)
1893 error = EIO;
1894 goto out;
1895 }
1896 if (!ISSET(tp->t_state, TS_CONNECTED)) {
1897 if (flag & IO_NDELAY) {
1898 crit_exit();
1899 error = EWOULDBLOCK;
1900 goto out;
1901 }
1902 error = ttysleep(tp, TSA_CARR_ON(tp), PCATCH, "ttydcd", 0);
1903 crit_exit();
1904 if (error)
1905 goto out;
1906 goto loop;
1907 }
1908 crit_exit();
1909
1910 /*
1911 * Hang the process if it's in the background.
1912 */
1913 if ((pp = curproc) && isbackground(pp, tp) &&
1914 ISSET(tp->t_lflag, TOSTOP) && !(pp->p_flag & P_PPWAIT) &&
1915 !SIGISMEMBER(pp->p_sigignore, SIGTTOU) &&
1916 !SIGISMEMBER(lp->lwp_sigmask, SIGTTOU)) {
1917 if (pp->p_pgrp->pg_jobc == 0) {
1918 error = EIO;
1919 goto out;
1920 }
1921 pgsignal(pp->p_pgrp, SIGTTOU, 1);
1922 error = ttysleep(tp, &lbolt, PCATCH, "ttybg4", 0);
1923 if (error)
1924 goto out;
1925 goto loop;
1926 }
1927 /*
1928 * Process the user's data in at most OBUFSIZ chunks. Perform any
1929 * output translation. Keep track of high water mark, sleep on
1930 * overflow awaiting device aid in acquiring new space.
1931 */
1932 while (uio->uio_resid > 0 || cc > 0) {
1933 if (ISSET(tp->t_lflag, FLUSHO)) {
1934 uio->uio_resid = 0;
1935 return (0);
1936 }
1937 if (tp->t_outq.c_cc > hiwat)
1938 goto ovhiwat;
1939 /*
1940 * Grab a hunk of data from the user, unless we have some
1941 * leftover from last time.
1942 */
1943 if (cc == 0) {
1944 cc = imin(uio->uio_resid, OBUFSIZ);
1945 cp = obuf;
1946 error = uiomove(cp, cc, uio);
1947 if (error) {
1948 cc = 0;
1949 break;
1950 }
1951 }
1952 /*
1953 * If nothing fancy need be done, grab those characters we
1954 * can handle without any of ttyoutput's processing and
1955 * just transfer them to the output q. For those chars
1956 * which require special processing (as indicated by the
1957 * bits in char_type), call ttyoutput. After processing
1958 * a hunk of data, look for FLUSHO so ^O's will take effect
1959 * immediately.
1960 */
1961 while (cc > 0) {
1962 if (!ISSET(tp->t_oflag, OPOST))
1963 ce = cc;
1964 else {
1965 ce = cc - scanc((u_int)cc, (u_char *)cp,
1966 char_type, CCLASSMASK);
1967 /*
1968 * If ce is zero, then we're processing
1969 * a special character through ttyoutput.
1970 */
1971 if (ce == 0) {
1972 tp->t_rocount = 0;
1973 if (ttyoutput(*cp, tp) >= 0) {
1974 /* No Clists, wait a bit. */
1975 ttstart(tp);
1976 if (flag & IO_NDELAY) {
1977 error = EWOULDBLOCK;
1978 goto out;
1979 }
1980 error = ttysleep(tp, &lbolt,
1981 PCATCH,
1982 "ttybf1", 0);
1983 if (error)
1984 goto out;
1985 goto loop;
1986 }
1987 cp++;
1988 cc--;
1989 if (ISSET(tp->t_lflag, FLUSHO) ||
1990 tp->t_outq.c_cc > hiwat)
1991 goto ovhiwat;
1992 continue;
1993 }
1994 }
1995 /*
1996 * A bunch of normal characters have been found.
1997 * Transfer them en masse to the output queue and
1998 * continue processing at the top of the loop.
1999 * If there are any further characters in this
2000 * <= OBUFSIZ chunk, the first should be a character
2001 * requiring special handling by ttyoutput.
2002 */
2003 tp->t_rocount = 0;
2004 i = b_to_q(cp, ce, &tp->t_outq);
2005 ce -= i;
2006 tp->t_column += ce;
2007 cp += ce, cc -= ce, tk_nout += ce;
2008 tp->t_outcc += ce;
2009 if (i > 0) {
2010 /* No Clists, wait a bit. */
2011 ttstart(tp);
2012 if (flag & IO_NDELAY) {
2013 error = EWOULDBLOCK;
2014 goto out;
2015 }
2016 error = ttysleep(tp, &lbolt, PCATCH,
2017 "ttybf2", 0);
2018 if (error)
2019 goto out;
2020 goto loop;
2021 }
2022 if (ISSET(tp->t_lflag, FLUSHO) ||
2023 tp->t_outq.c_cc > hiwat)
2024 break;
2025 }
2026 ttstart(tp);
2027 }
2028 out:
2029 /*
2030 * If cc is nonzero, we leave the uio structure inconsistent, as the
2031 * offset and iov pointers have moved forward, but it doesn't matter
2032 * (the call will either return short or restart with a new uio).
2033 */
2034 uio->uio_resid += cc;
2035 return (error);
2036
2037 ovhiwat:
2038 ttstart(tp);
2039 crit_enter();
2040 /*
2041 * This can only occur if FLUSHO is set in t_lflag,
2042 * or if ttstart/oproc is synchronous (or very fast).
2043 */
2044 if (tp->t_outq.c_cc <= hiwat) {
2045 crit_exit();
2046 goto loop;
2047 }
2048 if (flag & IO_NDELAY) {
2049 crit_exit();
2050 uio->uio_resid += cc;
2051 return (uio->uio_resid == cnt ? EWOULDBLOCK : 0);
2052 }
2053 SET(tp->t_state, TS_SO_OLOWAT);
2054 error = ttysleep(tp, TSA_OLOWAT(tp), PCATCH, "ttywri", tp->t_timeout);
2055 crit_exit();
2056 if (error == EWOULDBLOCK)
2057 error = EIO;
2058 if (error)
2059 goto out;
2060 goto loop;
2061 }
2062
2063 /*
2064 * Rubout one character from the rawq of tp
2065 * as cleanly as possible.
2066 */
2067 static void
2068 ttyrub(int c, struct tty *tp)
2069 {
2070 char *cp;
2071 int savecol;
2072 int tabc;
2073
2074 if (!ISSET(tp->t_lflag, ECHO) || ISSET(tp->t_lflag, EXTPROC))
2075 return;
2076 CLR(tp->t_lflag, FLUSHO);
2077 if (ISSET(tp->t_lflag, ECHOE)) {
2078 if (tp->t_rocount == 0) {
2079 /*
2080 * Screwed by ttwrite; retype
2081 */
2082 ttyretype(tp);
2083 return;
2084 }
2085 if (c == ('\t' | TTY_QUOTE) || c == ('\n' | TTY_QUOTE))
2086 ttyrubo(tp, 2);
2087 else {
2088 CLR(c, ~TTY_CHARMASK);
2089 switch (CCLASS(c)) {
2090 case ORDINARY:
2091 ttyrubo(tp, 1);
2092 break;
2093 case BACKSPACE:
2094 case CONTROL:
2095 case NEWLINE:
2096 case RETURN:
2097 case VTAB:
2098 if (ISSET(tp->t_lflag, ECHOCTL))
2099 ttyrubo(tp, 2);
2100 break;
2101 case TAB:
2102 if (tp->t_rocount < tp->t_rawq.c_cc) {
2103 ttyretype(tp);
2104 return;
2105 }
2106 crit_enter();
2107 savecol = tp->t_column;
2108 SET(tp->t_state, TS_CNTTB);
2109 SET(tp->t_lflag, FLUSHO);
2110 tp->t_column = tp->t_rocol;
2111 cp = tp->t_rawq.c_cf;
2112 if (cp)
2113 tabc = *cp; /* XXX FIX NEXTC */
2114 for (; cp; cp = nextc(&tp->t_rawq, cp, &tabc))
2115 ttyecho(tabc, tp);
2116 CLR(tp->t_lflag, FLUSHO);
2117 CLR(tp->t_state, TS_CNTTB);
2118 crit_exit();
2119
2120 /* savecol will now be length of the tab. */
2121 savecol -= tp->t_column;
2122 tp->t_column += savecol;
2123 if (savecol > 8)
2124 savecol = 8; /* overflow screw */
2125 while (--savecol >= 0)
2126 (void)ttyoutput('\b', tp);
2127 break;
2128 default: /* XXX */
2129 #define PANICSTR "ttyrub: would panic c = %d, val = %d\n"
2130 (void)kprintf(PANICSTR, c, CCLASS(c));
2131 #ifdef notdef
2132 panic(PANICSTR, c, CCLASS(c));
2133 #endif
2134 }
2135 }
2136 } else if (ISSET(tp->t_lflag, ECHOPRT)) {
2137 if (!ISSET(tp->t_state, TS_ERASE)) {
2138 SET(tp->t_state, TS_ERASE);
2139 (void)ttyoutput('\\', tp);
2140 }
2141 ttyecho(c, tp);
2142 } else {
2143 ttyecho(tp->t_cc[VERASE], tp);
2144 /*
2145 * This code may be executed not only when an ERASE key
2146 * is pressed, but also when ^U (KILL) or ^W (WERASE) are.
2147 * So, I didn't think it was worthwhile to pass the extra
2148 * information (which would need an extra parameter,
2149 * changing every call) needed to distinguish the ERASE2
2150 * case from the ERASE.
2151 */
2152 }
2153 --tp->t_rocount;
2154 }
2155
2156 /*
2157 * Back over cnt characters, erasing them.
2158 */
2159 static void
2160 ttyrubo(struct tty *tp, int cnt)
2161 {
2162
2163 while (cnt-- > 0) {
2164 (void)ttyoutput('\b', tp);
2165 (void)ttyoutput(' ', tp);
2166 (void)ttyoutput('\b', tp);
2167 }
2168 }
2169
2170 /*
2171 * ttyretype --
2172 * Reprint the rawq line. Note, it is assumed that c_cc has already
2173 * been checked.
2174 */
2175 static void
2176 ttyretype(struct tty *tp)
2177 {
2178 char *cp;
2179 int c;
2180
2181 /* Echo the reprint character. */
2182 if (tp->t_cc[VREPRINT] != _POSIX_VDISABLE)
2183 ttyecho(tp->t_cc[VREPRINT], tp);
2184
2185 (void)ttyoutput('\n', tp);
2186
2187 /*
2188 * XXX
2189 * FIX: NEXTC IS BROKEN - DOESN'T CHECK QUOTE
2190 * BIT OF FIRST CHAR.
2191 */
2192 crit_enter();
2193 for (cp = tp->t_canq.c_cf, c = (cp != NULL ? *cp : 0);
2194 cp != NULL; cp = nextc(&tp->t_canq, cp, &c))
2195 ttyecho(c, tp);
2196 for (cp = tp->t_rawq.c_cf, c = (cp != NULL ? *cp : 0);
2197 cp != NULL; cp = nextc(&tp->t_rawq, cp, &c))
2198 ttyecho(c, tp);
2199 CLR(tp->t_state, TS_ERASE);
2200 crit_exit();
2201
2202 tp->t_rocount = tp->t_rawq.c_cc;
2203 tp->t_rocol = 0;
2204 }
2205
2206 /*
2207 * Echo a typed character to the terminal.
2208 */
2209 static void
2210 ttyecho(int c, struct tty *tp)
2211 {
2212
2213 if (!ISSET(tp->t_state, TS_CNTTB))
2214 CLR(tp->t_lflag, FLUSHO);
2215 if ((!ISSET(tp->t_lflag, ECHO) &&
2216 (c != '\n' || !ISSET(tp->t_lflag, ECHONL))) ||
2217 ISSET(tp->t_lflag, EXTPROC))
2218 return;
2219 if (ISSET(tp->t_lflag, ECHOCTL) &&
2220 ((ISSET(c, TTY_CHARMASK) <= 037 && c != '\t' && c != '\n') ||
2221 ISSET(c, TTY_CHARMASK) == 0177)) {
2222 (void)ttyoutput('^', tp);
2223 CLR(c, ~TTY_CHARMASK);
2224 if (c == 0177)
2225 c = '?';
2226 else
2227 c += 'A' - 1;
2228 }
2229 (void)ttyoutput(c, tp);
2230 }
2231
2232 /*
2233 * Wake up any readers on a tty.
2234 */
2235 void
2236 ttwakeup(struct tty *tp)
2237 {
2238
2239 if (tp->t_rsel.si_pid != 0)
2240 selwakeup(&tp->t_rsel);
2241 if (ISSET(tp->t_state, TS_ASYNC) && tp->t_sigio != NULL)
2242 pgsigio(tp->t_sigio, SIGIO, (tp->t_session != NULL));
2243 wakeup(TSA_HUP_OR_INPUT(tp));
2244 KNOTE(&tp->t_rsel.si_note, 0);
2245 }
2246
2247 /*
2248 * Wake up any writers on a tty.
2249 */
2250 void
2251 ttwwakeup(struct tty *tp)
2252 {
2253
2254 if (tp->t_wsel.si_pid != 0 && tp->t_outq.c_cc <= tp->t_olowat)
2255 selwakeup(&tp->t_wsel);
2256 if (ISSET(tp->t_state, TS_ASYNC) && tp->t_sigio != NULL)
2257 pgsigio(tp->t_sigio, SIGIO, (tp->t_session != NULL));
2258 if (ISSET(tp->t_state, TS_BUSY | TS_SO_OCOMPLETE) ==
2259 TS_SO_OCOMPLETE && tp->t_outq.c_cc == 0) {
2260 CLR(tp->t_state, TS_SO_OCOMPLETE);
2261 wakeup(TSA_OCOMPLETE(tp));
2262 }
2263 if (ISSET(tp->t_state, TS_SO_OLOWAT) &&
2264 tp->t_outq.c_cc <= tp->t_olowat) {
2265 CLR(tp->t_state, TS_SO_OLOWAT);
2266 wakeup(TSA_OLOWAT(tp));
2267 }
2268 KNOTE(&tp->t_wsel.si_note, 0);
2269 }
2270
2271 /*
2272 * Look up a code for a specified speed in a conversion table;
2273 * used by drivers to map software speed values to hardware parameters.
2274 */
2275 int
2276 ttspeedtab(int speed, struct speedtab *table)
2277 {
2278
2279 for ( ; table->sp_speed != -1; table++)
2280 if (table->sp_speed == speed)
2281 return (table->sp_code);
2282 return (-1);
2283 }
2284
2285 /*
2286 * Set input and output watermarks and buffer sizes. For input, the
2287 * high watermark is about one second's worth of input above empty, the
2288 * low watermark is slightly below high water, and the buffer size is a
2289 * driver-dependent amount above high water. For output, the watermarks
2290 * are near the ends of the buffer, with about 1 second's worth of input
2291 * between them. All this only applies to the standard line discipline.
2292 */
2293 void
2294 ttsetwater(struct tty *tp)
2295 {
2296 int cps, ttmaxhiwat, x;
2297
2298 /* Input. */
2299 clist_alloc_cblocks(&tp->t_canq, TTYHOG, 512);
2300 switch (tp->t_ispeedwat) {
2301 case (speed_t)-1:
2302 cps = tp->t_ispeed / 10;
2303 break;
2304 case 0:
2305 /*
2306 * This case is for old drivers that don't know about
2307 * t_ispeedwat. Arrange for them to get the old buffer
2308 * sizes and watermarks.
2309 */
2310 cps = TTYHOG - 2 * 256;
2311 tp->t_ififosize = 2 * 2048;
2312 break;
2313 default:
2314 cps = tp->t_ispeedwat / 10;
2315 break;
2316 }
2317 tp->t_ihiwat = cps;
2318 tp->t_ilowat = 7 * cps / 8;
2319 x = cps + tp->t_ififosize;
2320 clist_alloc_cblocks(&tp->t_rawq, x, x);
2321
2322 /* Output. */
2323 switch (tp->t_ospeedwat) {
2324 case (speed_t)-1:
2325 cps = tp->t_ospeed / 10;
2326 ttmaxhiwat = 2 * TTMAXHIWAT;
2327 break;
2328 case 0:
2329 cps = tp->t_ospeed / 10;
2330 ttmaxhiwat = TTMAXHIWAT;
2331 break;
2332 default:
2333 cps = tp->t_ospeedwat / 10;
2334 ttmaxhiwat = 8 * TTMAXHIWAT;
2335 break;
2336 }
2337 #define CLAMP(x, h, l) ((x) > h ? h : ((x) < l) ? l : (x))
2338 tp->t_olowat = x = CLAMP(cps / 2, TTMAXLOWAT, TTMINLOWAT);
2339 x += cps;
2340 x = CLAMP(x, ttmaxhiwat, TTMINHIWAT); /* XXX clamps are too magic */
2341 tp->t_ohiwat = roundup(x, CBSIZE); /* XXX for compat */
2342 x = imax(tp->t_ohiwat, TTMAXHIWAT); /* XXX for compat/safety */
2343 x += OBUFSIZ + 100;
2344 clist_alloc_cblocks(&tp->t_outq, x, x);
2345 #undef CLAMP
2346 }
2347
2348 /*
2349 * Report on state of foreground process group.
2350 */
2351 void
2352 ttyinfo(struct tty *tp)
2353 {
2354 struct proc *p, *pick;
2355 struct lwp *lp;
2356 struct rusage ru;
2357 int tmp;
2358
2359 if (ttycheckoutq(tp,0) == 0)
2360 return;
2361
2362 /*
2363 * We always print the load average, then figure out what else to
2364 * print based on the state of the current process group.
2365 */
2366 tmp = (averunnable.ldavg[0] * 100 + FSCALE / 2) >> FSHIFT;
2367 ttyprintf(tp, "load: %d.%02d ", tmp / 100, tmp % 100);
2368
2369 if (tp->t_session == NULL) {
2370 ttyprintf(tp, "not a controlling terminal\n");
2371 } else if (tp->t_pgrp == NULL) {
2372 ttyprintf(tp, "no foreground process group\n");
2373 } else if ((p = LIST_FIRST(&tp->t_pgrp->pg_members)) == 0) {
2374 ttyprintf(tp, "empty foreground process group\n");
2375 } else {
2376 /*
2377 * Pick an interesting process. Note that certain elements,
2378 * in particular the wmesg, require a critical section for
2379 * safe access (YYY and we are still not MP safe).
2380 *
2381 * NOTE: lwp_wmesg is lwp_thread->td_wmesg.
2382 */
2383 char buf[64];
2384 const char *str;
2385 long vmsz;
2386 int pctcpu;
2387
2388 crit_enter();
2389
2390 /* XXX lwp should compare lwps */
2391
2392 for (pick = NULL; p != 0; p = LIST_NEXT(p, p_pglist)) {
2393 if (proc_compare(pick, p))
2394 pick = p;
2395 }
2396
2397 /* XXX lwp */
2398 lp = FIRST_LWP_IN_PROC(pick);
2399 if (lp == NULL) {
2400 ttyprintf(tp, "foreground process without lwp\n");
2401 tp->t_rocount = 0;
2402 crit_exit();
2403 return;
2404 }
2405
2406 /*
2407 * Figure out what wait/process-state message, and command
2408 * buffer to present
2409 */
2410 /*
2411 * XXX lwp This is a horrible mixture. We need to rework this
2412 * as soon as lwps have their own runnable status.
2413 */
2414 if (pick->p_flag & P_WEXIT)
2415 str = "exiting";
2416 else if (lp->lwp_stat == LSRUN)
2417 str = "running";
2418 else if (pick->p_stat == SIDL)
2419 str = "spawning";
2420 else if (lp->lwp_wmesg) /* lwp_thread must not be NULL */
2421 str = lp->lwp_wmesg;
2422 else
2423 str = "iowait";
2424
2425 ksnprintf(buf, sizeof(buf), "cmd: %s %d [%s]",
2426 pick->p_comm, pick->p_pid, str);
2427
2428 /*
2429 * Calculate cpu usage, percent cpu, and cmsz. Note that
2430 * 'pick' becomes invalid the moment we exit the critical
2431 * section.
2432 */
2433 if (lp->lwp_thread && (pick->p_flag & P_SWAPPEDOUT) == 0)
2434 calcru_proc(pick, &ru);
2435
2436 pctcpu = (lp->lwp_pctcpu * 10000 + FSCALE / 2) >> FSHIFT;
2437
2438 if (pick->p_stat == SIDL || pick->p_stat == SZOMB)
2439 vmsz = 0;
2440 else
2441 vmsz = pgtok(vmspace_resident_count(pick->p_vmspace));
2442
2443 crit_exit();
2444
2445 /*
2446 * Dump the output
2447 */
2448 ttyprintf(tp, " %s ", buf);
2449 ttyprintf(tp, "%ld.%02ldu ",
2450 ru.ru_utime.tv_sec, ru.ru_utime.tv_usec / 10000);
2451 ttyprintf(tp, "%ld.%02lds ",
2452 ru.ru_stime.tv_sec, ru.ru_stime.tv_usec / 10000);
2453 ttyprintf(tp, "%d%% %ldk\n", pctcpu / 100, vmsz);
2454 }
2455 tp->t_rocount = 0; /* so pending input will be retyped if BS */
2456 }
2457
2458 /*
2459 * Returns 1 if p2 is "better" than p1
2460 *
2461 * The algorithm for picking the "interesting" process is thus:
2462 *
2463 * 1) Only foreground processes are eligible - implied.
2464 * 2) Runnable processes are favored over anything else. The runner
2465 * with the highest cpu utilization is picked (p_cpticks). Ties are
2466 * broken by picking the highest pid.
2467 * 3) The sleeper with the shortest sleep time is next. With ties,
2468 * we pick out just "short-term" sleepers (LWP_SINTR == 0).
2469 * 4) Further ties are broken by picking the highest pid.
2470 */
2471 #define ISRUN(lp) ((lp)->lwp_stat == LSRUN)
2472 #define TESTAB(a, b) ((a)<<1 | (b))
2473 #define ONLYA 2
2474 #define ONLYB 1
2475 #define BOTH 3
2476
2477 static int
2478 proc_compare(struct proc *p1, struct proc *p2)
2479 {
2480 struct lwp *lp1, *lp2;
2481 if (p1 == NULL)
2482 return (1);
2483
2484 /*
2485 * weed out zombies
2486 */
2487 switch (TESTAB(p1->p_stat == SZOMB, p2->p_stat == SZOMB)) {
2488 case ONLYA:
2489 return (1);
2490 case ONLYB:
2491 return (0);
2492 case BOTH:
2493 return (p2->p_pid > p1->p_pid); /* tie - return highest pid */
2494 }
2495
2496 /* XXX lwp */
2497 lp1 = FIRST_LWP_IN_PROC(p1);
2498 lp2 = FIRST_LWP_IN_PROC(p2);
2499
2500 /*
2501 * see if at least one of them is runnable
2502 */
2503 switch (TESTAB(ISRUN(lp1), ISRUN(lp2))) {
2504 case ONLYA:
2505 return (0);
2506 case ONLYB:
2507 return (1);
2508 case BOTH:
2509 /*
2510 * tie - favor one with highest recent cpu utilization
2511 */
2512 if (lp2->lwp_cpticks > lp1->lwp_cpticks)
2513 return (1);
2514 if (lp1->lwp_cpticks > lp2->lwp_cpticks)
2515 return (0);
2516 return (p2->p_pid > p1->p_pid); /* tie - return highest pid */
2517 }
2518 /*
2519 * pick the one with the smallest sleep time
2520 */
2521 if (lp2->lwp_slptime > lp1->lwp_slptime)
2522 return (0);
2523 if (lp1->lwp_slptime > lp2->lwp_slptime)
2524 return (1);
2525 /*
2526 * favor one sleeping in a non-interruptible sleep
2527 */
2528 if (lp1->lwp_flag & LWP_SINTR && (lp2->lwp_flag & LWP_SINTR) == 0)
2529 return (1);
2530 if (lp2->lwp_flag & LWP_SINTR && (lp1->lwp_flag & LWP_SINTR) == 0)
2531 return (0);
2532 return (p2->p_pid > p1->p_pid); /* tie - return highest pid */
2533 }
2534
2535 /*
2536 * Output char to tty; console putchar style.
2537 */
2538 int
2539 tputchar(int c, struct tty *tp)
2540 {
2541 crit_enter();
2542 if (!ISSET(tp->t_state, TS_CONNECTED)) {
2543 crit_exit();
2544 return (-1);
2545 }
2546 if (c == '\n')
2547 (void)ttyoutput('\r', tp);
2548 (void)ttyoutput(c, tp);
2549 ttstart(tp);
2550 crit_exit();
2551 return (0);
2552 }
2553
2554 /*
2555 * Sleep on chan, returning ERESTART if tty changed while we napped and
2556 * returning any errors (e.g. EINTR/EWOULDBLOCK) reported by tsleep. If
2557 * the tty is revoked, restarting a pending call will redo validation done
2558 * at the start of the call.
2559 */
2560 int
2561 ttysleep(struct tty *tp, void *chan, int slpflags, char *wmesg, int timo)
2562 {
2563 int error;
2564 int gen;
2565
2566 gen = tp->t_gen;
2567 error = tsleep(chan, slpflags, wmesg, timo);
2568 if (error)
2569 return (error);
2570 return (tp->t_gen == gen ? 0 : ERESTART);
2571 }
2572
2573 /*
2574 * Allocate a tty struct. Clists in the struct will be allocated by
2575 * ttyopen().
2576 */
2577 struct tty *
2578 ttymalloc(struct tty *tp)
2579 {
2580
2581 if (tp)
2582 return(tp);
2583 tp = kmalloc(sizeof *tp, M_TTYS, M_WAITOK|M_ZERO);
2584 ttyregister(tp);
2585 return (tp);
2586 }
2587
2588 #if 0
2589 /*
2590 * Free a tty struct. Clists in the struct should have been freed by
2591 * ttyclose().
2592 *
2593 * XXX not yet usable: since we support a half-closed state and do not
2594 * ref count the tty reference from the session, it is possible for a
2595 * session to hold a ref on the tty. See TTY_DO_FULL_CLOSE.
2596 */
2597 void
2598 ttyfree(struct tty *tp)
2599 {
2600 kfree(tp, M_TTYS);
2601 }
2602 #endif /* 0 */
2603
2604 void
2605 ttyregister(struct tty *tp)
2606 {
2607 SLIST_INSERT_HEAD(&tty_list, tp, t_list);
2608 }
2609
2610 static int
2611 sysctl_kern_ttys(SYSCTL_HANDLER_ARGS)
2612 {
2613 int error;
2614 struct tty *tp, t;
2615 SLIST_FOREACH(tp, &tty_list, t_list) {
2616 t = *tp;
2617 if (t.t_dev)
2618 t.t_dev = (cdev_t)dev2udev(t.t_dev);
2619 error = SYSCTL_OUT(req, (caddr_t)&t, sizeof(t));
2620 if (error)
2621 return (error);
2622 }
2623 return (0);
2624 }
2625
2626 SYSCTL_PROC(_kern, OID_AUTO, ttys, CTLTYPE_OPAQUE|CTLFLAG_RD,
2627 0, 0, sysctl_kern_ttys, "S,tty", "All struct ttys");
2628
2629 void
2630 nottystop(struct tty *tp, int rw)
2631 {
2632
2633 return;
2634 }
2635
2636 int
2637 ttyread(struct dev_read_args *ap)
2638 {
2639 struct tty *tp;
2640
2641 tp = ap->a_head.a_dev->si_tty;
2642 if (tp == NULL)
2643 return (ENODEV);
2644 return ((*linesw[tp->t_line].l_read)(tp, ap->a_uio, ap->a_ioflag));
2645 }
2646
2647 int
2648 ttywrite(struct dev_write_args *ap)
2649 {
2650 struct tty *tp;
2651
2652 tp = ap->a_head.a_dev->si_tty;
2653 if (tp == NULL)
2654 return (ENODEV);
2655 return ((*linesw[tp->t_line].l_write)(tp, ap->a_uio, ap->a_ioflag));
2656 }
DragonFly BSD