1 | /* $NetBSD: tty.c,v 1.274 2016/10/01 04:42:54 christos Exp $ */ |
2 | |
3 | /*- |
4 | * Copyright (c) 2008 The NetBSD Foundation, Inc. |
5 | * All rights reserved. |
6 | * |
7 | * Redistribution and use in source and binary forms, with or without |
8 | * modification, are permitted provided that the following conditions |
9 | * are met: |
10 | * 1. Redistributions of source code must retain the above copyright |
11 | * notice, this list of conditions and the following disclaimer. |
12 | * 2. Redistributions in binary form must reproduce the above copyright |
13 | * notice, this list of conditions and the following disclaimer in the |
14 | * documentation and/or other materials provided with the distribution. |
15 | * |
16 | * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS |
17 | * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED |
18 | * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
19 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS |
20 | * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
21 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
22 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
23 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
24 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
25 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
26 | * POSSIBILITY OF SUCH DAMAGE. |
27 | */ |
28 | |
29 | /*- |
30 | * Copyright (c) 1982, 1986, 1990, 1991, 1993 |
31 | * The Regents of the University of California. All rights reserved. |
32 | * (c) UNIX System Laboratories, Inc. |
33 | * All or some portions of this file are derived from material licensed |
34 | * to the University of California by American Telephone and Telegraph |
35 | * Co. or Unix System Laboratories, Inc. and are reproduced herein with |
36 | * the permission of UNIX System Laboratories, Inc. |
37 | * |
38 | * Redistribution and use in source and binary forms, with or without |
39 | * modification, are permitted provided that the following conditions |
40 | * are met: |
41 | * 1. Redistributions of source code must retain the above copyright |
42 | * notice, this list of conditions and the following disclaimer. |
43 | * 2. Redistributions in binary form must reproduce the above copyright |
44 | * notice, this list of conditions and the following disclaimer in the |
45 | * documentation and/or other materials provided with the distribution. |
46 | * 3. Neither the name of the University nor the names of its contributors |
47 | * may be used to endorse or promote products derived from this software |
48 | * without specific prior written permission. |
49 | * |
50 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
51 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
52 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
53 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
54 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
55 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
56 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
57 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
58 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
59 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
60 | * SUCH DAMAGE. |
61 | * |
62 | * @(#)tty.c 8.13 (Berkeley) 1/9/95 |
63 | */ |
64 | |
65 | #include <sys/cdefs.h> |
66 | __KERNEL_RCSID(0, "$NetBSD: tty.c,v 1.274 2016/10/01 04:42:54 christos Exp $" ); |
67 | |
68 | #ifdef _KERNEL_OPT |
69 | #include "opt_compat_netbsd.h" |
70 | #endif |
71 | |
72 | #define TTY_ALLOW_PRIVATE |
73 | |
74 | #include <sys/param.h> |
75 | #include <sys/systm.h> |
76 | #include <sys/ioctl.h> |
77 | #include <sys/proc.h> |
78 | #define TTYDEFCHARS |
79 | #include <sys/tty.h> |
80 | #undef TTYDEFCHARS |
81 | #include <sys/file.h> |
82 | #include <sys/conf.h> |
83 | #include <sys/cpu.h> |
84 | #include <sys/dkstat.h> |
85 | #include <sys/uio.h> |
86 | #include <sys/kernel.h> |
87 | #include <sys/vnode.h> |
88 | #include <sys/syslog.h> |
89 | #include <sys/kmem.h> |
90 | #include <sys/signalvar.h> |
91 | #include <sys/resourcevar.h> |
92 | #include <sys/poll.h> |
93 | #include <sys/kprintf.h> |
94 | #include <sys/namei.h> |
95 | #include <sys/sysctl.h> |
96 | #include <sys/kauth.h> |
97 | #include <sys/intr.h> |
98 | #include <sys/ioctl_compat.h> |
99 | #include <sys/module.h> |
100 | #include <sys/bitops.h> |
101 | |
102 | #ifdef COMPAT_60 |
103 | #include <compat/sys/ttycom.h> |
104 | #endif /* COMPAT_60 */ |
105 | |
106 | static int ttnread(struct tty *); |
107 | static void ttyblock(struct tty *); |
108 | static void ttyecho(int, struct tty *); |
109 | static void ttyrubo(struct tty *, int); |
110 | static void ttyprintf_nolock(struct tty *, const char *fmt, ...) |
111 | __printflike(2, 3); |
112 | static int proc_compare_wrapper(struct proc *, struct proc *); |
113 | static void ttysigintr(void *); |
114 | |
115 | /* Symbolic sleep message strings. */ |
116 | const char ttclos[] = "ttycls" ; |
117 | const char ttopen[] = "ttyopn" ; |
118 | const char ttybg[] = "ttybg" ; |
119 | const char ttyin[] = "ttyin" ; |
120 | const char ttyout[] = "ttyout" ; |
121 | |
122 | /* |
123 | * Used to determine whether we still have a connection. This is true in |
124 | * one of 3 cases: |
125 | * 1) We have carrier. |
126 | * 2) It's a locally attached terminal, and we are therefore ignoring carrier. |
127 | * 3) We're using a flow control mechanism that overloads the carrier signal. |
128 | */ |
129 | #define CONNECTED(tp) (ISSET(tp->t_state, TS_CARR_ON) || \ |
130 | ISSET(tp->t_cflag, CLOCAL | MDMBUF)) |
131 | |
132 | /* |
133 | * Table with character classes and parity. The 8th bit indicates parity, |
134 | * the 7th bit indicates the character is an alphameric or underscore (for |
135 | * ALTWERASE), and the low 6 bits indicate delay type. If the low 6 bits |
136 | * are 0 then the character needs no special processing on output; classes |
137 | * other than 0 might be translated or (not currently) require delays. |
138 | */ |
139 | #define E 0x00 /* Even parity. */ |
140 | #define O 0x80 /* Odd parity. */ |
141 | #define PARITY(c) (char_type[c] & O) |
142 | |
143 | #define ALPHA 0x40 /* Alpha or underscore. */ |
144 | #define ISALPHA(c) (char_type[(c) & TTY_CHARMASK] & ALPHA) |
145 | |
146 | #define CCLASSMASK 0x3f |
147 | #define CCLASS(c) (char_type[c] & CCLASSMASK) |
148 | |
149 | #define BS BACKSPACE |
150 | #define CC CONTROL |
151 | #define CR RETURN |
152 | #define NA ORDINARY | ALPHA |
153 | #define NL NEWLINE |
154 | #define NO ORDINARY |
155 | #define TB TAB |
156 | #define VT VTAB |
157 | |
158 | unsigned char const char_type[] = { |
159 | E|CC, O|CC, O|CC, E|CC, O|CC, E|CC, E|CC, O|CC, /* nul - bel */ |
160 | O|BS, E|TB, E|NL, O|CC, E|VT, O|CR, O|CC, E|CC, /* bs - si */ |
161 | O|CC, E|CC, E|CC, O|CC, E|CC, O|CC, O|CC, E|CC, /* dle - etb */ |
162 | E|CC, O|CC, O|CC, E|CC, O|CC, E|CC, E|CC, O|CC, /* can - us */ |
163 | O|NO, E|NO, E|NO, O|NO, E|NO, O|NO, O|NO, E|NO, /* sp - ' */ |
164 | E|NO, O|NO, O|NO, E|NO, O|NO, E|NO, E|NO, O|NO, /* ( - / */ |
165 | E|NA, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* 0 - 7 */ |
166 | O|NA, E|NA, E|NO, O|NO, E|NO, O|NO, O|NO, E|NO, /* 8 - ? */ |
167 | O|NO, E|NA, E|NA, O|NA, E|NA, O|NA, O|NA, E|NA, /* @ - G */ |
168 | E|NA, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* H - O */ |
169 | E|NA, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* P - W */ |
170 | O|NA, E|NA, E|NA, O|NO, E|NO, O|NO, O|NO, O|NA, /* X - _ */ |
171 | E|NO, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* ` - g */ |
172 | O|NA, E|NA, E|NA, O|NA, E|NA, O|NA, O|NA, E|NA, /* h - o */ |
173 | O|NA, E|NA, E|NA, O|NA, E|NA, O|NA, O|NA, E|NA, /* p - w */ |
174 | E|NA, O|NA, O|NA, E|NO, O|NO, E|NO, E|NO, O|CC, /* x - del */ |
175 | /* |
176 | * Meta chars; should be settable per character set; |
177 | * for now, treat them all as normal characters. |
178 | */ |
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 | NA, NA, NA, NA, NA, NA, NA, NA, |
186 | NA, NA, NA, NA, NA, NA, NA, NA, |
187 | NA, NA, NA, NA, NA, NA, NA, NA, |
188 | NA, NA, NA, NA, NA, NA, NA, NA, |
189 | NA, NA, NA, NA, NA, NA, NA, NA, |
190 | NA, NA, NA, NA, NA, NA, NA, NA, |
191 | NA, NA, NA, NA, NA, NA, NA, NA, |
192 | NA, NA, NA, NA, NA, NA, NA, NA, |
193 | NA, NA, NA, NA, NA, NA, NA, NA, |
194 | NA, NA, NA, NA, NA, NA, NA, NA, |
195 | }; |
196 | #undef BS |
197 | #undef CC |
198 | #undef CR |
199 | #undef NA |
200 | #undef NL |
201 | #undef NO |
202 | #undef TB |
203 | #undef VT |
204 | |
205 | static struct ttylist_head tty_sigqueue = TAILQ_HEAD_INITIALIZER(tty_sigqueue); |
206 | static void *tty_sigsih; |
207 | |
208 | struct ttylist_head ttylist = TAILQ_HEAD_INITIALIZER(ttylist); |
209 | int tty_count; |
210 | kmutex_t tty_lock; |
211 | krwlock_t ttcompat_lock; |
212 | int (*ttcompatvec)(struct tty *, u_long, void *, int, struct lwp *); |
213 | |
214 | uint64_t tk_cancc; |
215 | uint64_t tk_nin; |
216 | uint64_t tk_nout; |
217 | uint64_t tk_rawcc; |
218 | |
219 | static kauth_listener_t tty_listener; |
220 | |
221 | #define TTY_MINQSIZE 0x00400 |
222 | #define TTY_MAXQSIZE 0x10000 |
223 | int tty_qsize = TTY_MINQSIZE; |
224 | |
225 | static int |
226 | tty_get_qsize(int *qsize, int newsize) |
227 | { |
228 | newsize = 1 << ilog2(newsize); /* Make it a power of two */ |
229 | |
230 | if (newsize < TTY_MINQSIZE || newsize > TTY_MAXQSIZE) |
231 | return EINVAL; |
232 | |
233 | *qsize = newsize; |
234 | return 0; |
235 | } |
236 | |
237 | static int |
238 | tty_set_qsize(struct tty *tp, int newsize) |
239 | { |
240 | struct clist rawq, canq, outq; |
241 | struct clist orawq, ocanq, ooutq; |
242 | |
243 | clalloc(&rawq, newsize, 1); |
244 | clalloc(&canq, newsize, 1); |
245 | clalloc(&outq, newsize, 0); |
246 | |
247 | mutex_spin_enter(&tty_lock); |
248 | |
249 | if (tp->t_outq.c_cc != 0) { |
250 | mutex_spin_exit(&tty_lock); |
251 | clfree(&rawq); |
252 | clfree(&canq); |
253 | clfree(&outq); |
254 | return EBUSY; |
255 | } |
256 | |
257 | orawq = tp->t_rawq; |
258 | ocanq = tp->t_canq; |
259 | ooutq = tp->t_outq; |
260 | |
261 | tp->t_qsize = newsize; |
262 | tp->t_rawq = rawq; |
263 | tp->t_canq = canq; |
264 | tp->t_outq = outq; |
265 | |
266 | ttsetwater(tp); |
267 | |
268 | mutex_spin_exit(&tty_lock); |
269 | |
270 | clfree(&orawq); |
271 | clfree(&ocanq); |
272 | clfree(&ooutq); |
273 | |
274 | return 0; |
275 | } |
276 | |
277 | static int |
278 | sysctl_kern_tty_qsize(SYSCTLFN_ARGS) |
279 | { |
280 | int newsize; |
281 | int error; |
282 | struct sysctlnode node; |
283 | node = *rnode; |
284 | node.sysctl_data = &newsize; |
285 | |
286 | newsize = tty_qsize; |
287 | error = sysctl_lookup(SYSCTLFN_CALL(&node)); |
288 | if (error || newp == NULL) |
289 | return error; |
290 | |
291 | |
292 | return tty_get_qsize(&tty_qsize, newsize); |
293 | } |
294 | |
295 | static void |
296 | sysctl_kern_tty_setup(void) |
297 | { |
298 | const struct sysctlnode *rnode, *cnode; |
299 | struct sysctllog *kern_tkstat_sysctllog, *kern_tty_sysctllog; |
300 | |
301 | kern_tkstat_sysctllog = NULL; |
302 | sysctl_createv(&kern_tkstat_sysctllog, 0, NULL, NULL, |
303 | CTLFLAG_PERMANENT, |
304 | CTLTYPE_NODE, "tkstat" , |
305 | SYSCTL_DESCR("Number of characters sent and and " |
306 | "received on ttys" ), |
307 | NULL, 0, NULL, 0, |
308 | CTL_KERN, KERN_TKSTAT, CTL_EOL); |
309 | |
310 | sysctl_createv(&kern_tkstat_sysctllog, 0, NULL, NULL, |
311 | CTLFLAG_PERMANENT, |
312 | CTLTYPE_QUAD, "nin" , |
313 | SYSCTL_DESCR("Total number of tty input characters" ), |
314 | NULL, 0, &tk_nin, 0, |
315 | CTL_KERN, KERN_TKSTAT, KERN_TKSTAT_NIN, CTL_EOL); |
316 | sysctl_createv(&kern_tkstat_sysctllog, 0, NULL, NULL, |
317 | CTLFLAG_PERMANENT, |
318 | CTLTYPE_QUAD, "nout" , |
319 | SYSCTL_DESCR("Total number of tty output characters" ), |
320 | NULL, 0, &tk_nout, 0, |
321 | CTL_KERN, KERN_TKSTAT, KERN_TKSTAT_NOUT, CTL_EOL); |
322 | sysctl_createv(&kern_tkstat_sysctllog, 0, NULL, NULL, |
323 | CTLFLAG_PERMANENT, |
324 | CTLTYPE_QUAD, "cancc" , |
325 | SYSCTL_DESCR("Number of canonical tty input characters" ), |
326 | NULL, 0, &tk_cancc, 0, |
327 | CTL_KERN, KERN_TKSTAT, KERN_TKSTAT_CANCC, CTL_EOL); |
328 | sysctl_createv(&kern_tkstat_sysctllog, 0, NULL, NULL, |
329 | CTLFLAG_PERMANENT, |
330 | CTLTYPE_QUAD, "rawcc" , |
331 | SYSCTL_DESCR("Number of raw tty input characters" ), |
332 | NULL, 0, &tk_rawcc, 0, |
333 | CTL_KERN, KERN_TKSTAT, KERN_TKSTAT_RAWCC, CTL_EOL); |
334 | |
335 | kern_tty_sysctllog = NULL; |
336 | sysctl_createv(&kern_tty_sysctllog, 0, NULL, &rnode, |
337 | CTLFLAG_PERMANENT, |
338 | CTLTYPE_NODE, "tty" , NULL, |
339 | NULL, 0, NULL, 0, |
340 | CTL_KERN, CTL_CREATE, CTL_EOL); |
341 | sysctl_createv(&kern_tty_sysctllog, 0, &rnode, &cnode, |
342 | CTLFLAG_PERMANENT | CTLFLAG_READWRITE, |
343 | CTLTYPE_INT, "qsize" , |
344 | SYSCTL_DESCR("TTY input and output queue size" ), |
345 | sysctl_kern_tty_qsize, 0, &tty_qsize, 0, |
346 | CTL_CREATE, CTL_EOL); |
347 | } |
348 | |
349 | int |
350 | ttyopen(struct tty *tp, int dialout, int nonblock) |
351 | { |
352 | int error; |
353 | |
354 | error = 0; |
355 | |
356 | mutex_spin_enter(&tty_lock); |
357 | |
358 | if (dialout) { |
359 | /* |
360 | * If the device is already open for non-dialout, fail. |
361 | * Otherwise, set TS_DIALOUT to block any pending non-dialout |
362 | * opens. |
363 | */ |
364 | if (ISSET(tp->t_state, TS_ISOPEN) && |
365 | !ISSET(tp->t_state, TS_DIALOUT)) { |
366 | error = EBUSY; |
367 | goto out; |
368 | } |
369 | SET(tp->t_state, TS_DIALOUT); |
370 | } else { |
371 | if (!nonblock) { |
372 | /* |
373 | * Wait for carrier. Also wait for any dialout |
374 | * processes to close the tty first. |
375 | */ |
376 | while (ISSET(tp->t_state, TS_DIALOUT) || |
377 | !CONNECTED(tp)) { |
378 | tp->t_wopen++; |
379 | error = ttysleep(tp, &tp->t_rawcv, true, 0); |
380 | tp->t_wopen--; |
381 | if (error) |
382 | goto out; |
383 | } |
384 | } else { |
385 | /* |
386 | * Don't allow a non-blocking non-dialout open if the |
387 | * device is already open for dialout. |
388 | */ |
389 | if (ISSET(tp->t_state, TS_DIALOUT)) { |
390 | error = EBUSY; |
391 | goto out; |
392 | } |
393 | } |
394 | } |
395 | |
396 | out: |
397 | mutex_spin_exit(&tty_lock); |
398 | return (error); |
399 | } |
400 | |
401 | /* |
402 | * Initial open of tty, or (re)entry to standard tty line discipline. |
403 | */ |
404 | int |
405 | ttylopen(dev_t device, struct tty *tp) |
406 | { |
407 | |
408 | mutex_spin_enter(&tty_lock); |
409 | tp->t_dev = device; |
410 | if (!ISSET(tp->t_state, TS_ISOPEN)) { |
411 | SET(tp->t_state, TS_ISOPEN); |
412 | memset(&tp->t_winsize, 0, sizeof(tp->t_winsize)); |
413 | tp->t_flags = 0; |
414 | } |
415 | mutex_spin_exit(&tty_lock); |
416 | if (tp->t_qsize != tty_qsize) |
417 | tty_set_qsize(tp, tty_qsize); |
418 | return (0); |
419 | } |
420 | |
421 | /* |
422 | * Handle close() on a tty line: flush and set to initial state, |
423 | * bumping generation number so that pending read/write calls |
424 | * can detect recycling of the tty. |
425 | */ |
426 | int |
427 | ttyclose(struct tty *tp) |
428 | { |
429 | extern struct tty *constty; /* Temporary virtual console. */ |
430 | struct session *sess; |
431 | |
432 | mutex_spin_enter(&tty_lock); |
433 | |
434 | if (constty == tp) |
435 | constty = NULL; |
436 | |
437 | ttyflush(tp, FREAD | FWRITE); |
438 | |
439 | tp->t_gen++; |
440 | tp->t_pgrp = NULL; |
441 | tp->t_state = 0; |
442 | sess = tp->t_session; |
443 | tp->t_session = NULL; |
444 | |
445 | mutex_spin_exit(&tty_lock); |
446 | |
447 | if (sess != NULL) { |
448 | mutex_enter(proc_lock); |
449 | /* Releases proc_lock. */ |
450 | proc_sessrele(sess); |
451 | } |
452 | return (0); |
453 | } |
454 | |
455 | #define FLUSHQ(q) { \ |
456 | if ((q)->c_cc) \ |
457 | ndflush(q, (q)->c_cc); \ |
458 | } |
459 | |
460 | /* |
461 | * This macro is used in canonical mode input processing, where a read |
462 | * request shall not return unless a 'line delimiter' ('\n') or 'break' |
463 | * (EOF, EOL, EOL2) character (or a signal) has been received. As EOL2 |
464 | * is an extension to the POSIX.1 defined set of special characters, |
465 | * recognize it only if IEXTEN is set in the set of local flags. |
466 | */ |
467 | #define TTBREAKC(c, lflg) \ |
468 | ((c) == '\n' || (((c) == cc[VEOF] || (c) == cc[VEOL] || \ |
469 | ((c) == cc[VEOL2] && ISSET(lflg, IEXTEN))) && (c) != _POSIX_VDISABLE)) |
470 | |
471 | |
472 | |
473 | /* |
474 | * ttyinput() helper. |
475 | * Call with the tty lock held. |
476 | */ |
477 | /* XXX static */ int |
478 | ttyinput_wlock(int c, struct tty *tp) |
479 | { |
480 | int iflag, lflag, i, error; |
481 | u_char *cc; |
482 | |
483 | KASSERT(mutex_owned(&tty_lock)); |
484 | |
485 | /* |
486 | * If input is pending take it first. |
487 | */ |
488 | lflag = tp->t_lflag; |
489 | if (ISSET(lflag, PENDIN)) |
490 | ttypend(tp); |
491 | /* |
492 | * Gather stats. |
493 | */ |
494 | if (ISSET(lflag, ICANON)) { |
495 | ++tk_cancc; |
496 | ++tp->t_cancc; |
497 | } else { |
498 | ++tk_rawcc; |
499 | ++tp->t_rawcc; |
500 | } |
501 | ++tk_nin; |
502 | |
503 | cc = tp->t_cc; |
504 | |
505 | /* |
506 | * Handle exceptional conditions (break, parity, framing). |
507 | */ |
508 | iflag = tp->t_iflag; |
509 | if ((error = (ISSET(c, TTY_ERRORMASK))) != 0) { |
510 | CLR(c, TTY_ERRORMASK); |
511 | if (ISSET(error, TTY_FE) && c == 0) { /* Break. */ |
512 | if (ISSET(iflag, IGNBRK)) |
513 | return (0); |
514 | else if (ISSET(iflag, BRKINT)) { |
515 | ttyflush(tp, FREAD | FWRITE); |
516 | ttysig(tp, TTYSIG_PG1, SIGINT); |
517 | return (0); |
518 | } else if (ISSET(iflag, PARMRK)) |
519 | goto parmrk; |
520 | } else if ((ISSET(error, TTY_PE) && ISSET(iflag, INPCK)) || |
521 | ISSET(error, TTY_FE)) { |
522 | if (ISSET(iflag, IGNPAR)) |
523 | return (0); |
524 | else if (ISSET(iflag, PARMRK)) { |
525 | parmrk: (void)putc(0377 | TTY_QUOTE, &tp->t_rawq); |
526 | (void)putc(0 | TTY_QUOTE, &tp->t_rawq); |
527 | (void)putc(c | TTY_QUOTE, &tp->t_rawq); |
528 | return (0); |
529 | } else |
530 | c = 0; |
531 | } |
532 | } else if (c == 0377 && |
533 | ISSET(iflag, ISTRIP|IGNPAR|INPCK|PARMRK) == (INPCK|PARMRK)) { |
534 | /* "Escape" a valid character of '\377'. */ |
535 | (void)putc(0377 | TTY_QUOTE, &tp->t_rawq); |
536 | (void)putc(0377 | TTY_QUOTE, &tp->t_rawq); |
537 | goto endcase; |
538 | } |
539 | |
540 | /* |
541 | * In tandem mode, check high water mark. |
542 | */ |
543 | if (ISSET(iflag, IXOFF) || ISSET(tp->t_cflag, CHWFLOW)) |
544 | ttyblock(tp); |
545 | if (!ISSET(tp->t_state, TS_TYPEN) && ISSET(iflag, ISTRIP)) |
546 | CLR(c, 0x80); |
547 | if (!ISSET(lflag, EXTPROC)) { |
548 | /* |
549 | * Check for literal nexting very first |
550 | */ |
551 | if (ISSET(tp->t_state, TS_LNCH)) { |
552 | SET(c, TTY_QUOTE); |
553 | CLR(tp->t_state, TS_LNCH); |
554 | } |
555 | /* |
556 | * Scan for special characters. This code |
557 | * is really just a big case statement with |
558 | * non-constant cases. The bottom of the |
559 | * case statement is labeled ``endcase'', so goto |
560 | * it after a case match, or similar. |
561 | */ |
562 | |
563 | /* |
564 | * Control chars which aren't controlled |
565 | * by ICANON, ISIG, or IXON. |
566 | */ |
567 | if (ISSET(lflag, IEXTEN)) { |
568 | if (CCEQ(cc[VLNEXT], c)) { |
569 | if (ISSET(lflag, ECHO)) { |
570 | if (ISSET(lflag, ECHOE)) { |
571 | (void)ttyoutput('^', tp); |
572 | (void)ttyoutput('\b', tp); |
573 | } else |
574 | ttyecho(c, tp); |
575 | } |
576 | SET(tp->t_state, TS_LNCH); |
577 | goto endcase; |
578 | } |
579 | if (CCEQ(cc[VDISCARD], c)) { |
580 | if (ISSET(lflag, FLUSHO)) |
581 | CLR(tp->t_lflag, FLUSHO); |
582 | else { |
583 | ttyflush(tp, FWRITE); |
584 | ttyecho(c, tp); |
585 | if (tp->t_rawq.c_cc + tp->t_canq.c_cc) |
586 | ttyretype(tp); |
587 | SET(tp->t_lflag, FLUSHO); |
588 | } |
589 | goto startoutput; |
590 | } |
591 | } |
592 | /* |
593 | * Signals. |
594 | */ |
595 | if (ISSET(lflag, ISIG)) { |
596 | if (CCEQ(cc[VINTR], c) || CCEQ(cc[VQUIT], c)) { |
597 | if (!ISSET(lflag, NOFLSH)) |
598 | ttyflush(tp, FREAD | FWRITE); |
599 | ttyecho(c, tp); |
600 | ttysig(tp, TTYSIG_PG1, CCEQ(cc[VINTR], c) ? |
601 | SIGINT : SIGQUIT); |
602 | goto endcase; |
603 | } |
604 | if (CCEQ(cc[VSUSP], c)) { |
605 | if (!ISSET(lflag, NOFLSH)) |
606 | ttyflush(tp, FREAD); |
607 | ttyecho(c, tp); |
608 | ttysig(tp, TTYSIG_PG1, SIGTSTP); |
609 | goto endcase; |
610 | } |
611 | } |
612 | /* |
613 | * Handle start/stop characters. |
614 | */ |
615 | if (ISSET(iflag, IXON)) { |
616 | if (CCEQ(cc[VSTOP], c)) { |
617 | if (!ISSET(tp->t_state, TS_TTSTOP)) { |
618 | SET(tp->t_state, TS_TTSTOP); |
619 | cdev_stop(tp, 0); |
620 | return (0); |
621 | } |
622 | if (!CCEQ(cc[VSTART], c)) |
623 | return (0); |
624 | /* |
625 | * if VSTART == VSTOP then toggle |
626 | */ |
627 | goto endcase; |
628 | } |
629 | if (CCEQ(cc[VSTART], c)) |
630 | goto restartoutput; |
631 | } |
632 | /* |
633 | * IGNCR, ICRNL, & INLCR |
634 | */ |
635 | if (c == '\r') { |
636 | if (ISSET(iflag, IGNCR)) |
637 | goto endcase; |
638 | else if (ISSET(iflag, ICRNL)) |
639 | c = '\n'; |
640 | } else if (c == '\n' && ISSET(iflag, INLCR)) |
641 | c = '\r'; |
642 | } |
643 | if (!ISSET(lflag, EXTPROC) && ISSET(lflag, ICANON)) { |
644 | /* |
645 | * From here on down canonical mode character |
646 | * processing takes place. |
647 | */ |
648 | /* |
649 | * erase (^H / ^?) |
650 | */ |
651 | if (CCEQ(cc[VERASE], c)) { |
652 | if (tp->t_rawq.c_cc) |
653 | ttyrub(unputc(&tp->t_rawq), tp); |
654 | goto endcase; |
655 | } |
656 | /* |
657 | * kill (^U) |
658 | */ |
659 | if (CCEQ(cc[VKILL], c)) { |
660 | if (ISSET(lflag, ECHOKE) && |
661 | tp->t_rawq.c_cc == tp->t_rocount && |
662 | !ISSET(lflag, ECHOPRT)) |
663 | while (tp->t_rawq.c_cc) |
664 | ttyrub(unputc(&tp->t_rawq), tp); |
665 | else { |
666 | ttyecho(c, tp); |
667 | if (ISSET(lflag, ECHOK) || |
668 | ISSET(lflag, ECHOKE)) |
669 | ttyecho('\n', tp); |
670 | FLUSHQ(&tp->t_rawq); |
671 | tp->t_rocount = 0; |
672 | } |
673 | CLR(tp->t_state, TS_LOCAL); |
674 | goto endcase; |
675 | } |
676 | /* |
677 | * Extensions to the POSIX.1 GTI set of functions. |
678 | */ |
679 | if (ISSET(lflag, IEXTEN)) { |
680 | /* |
681 | * word erase (^W) |
682 | */ |
683 | if (CCEQ(cc[VWERASE], c)) { |
684 | int alt = ISSET(lflag, ALTWERASE); |
685 | int ctype; |
686 | |
687 | /* |
688 | * erase whitespace |
689 | */ |
690 | while ((c = unputc(&tp->t_rawq)) == ' ' || |
691 | c == '\t') |
692 | ttyrub(c, tp); |
693 | if (c == -1) |
694 | goto endcase; |
695 | /* |
696 | * erase last char of word and remember the |
697 | * next chars type (for ALTWERASE) |
698 | */ |
699 | ttyrub(c, tp); |
700 | c = unputc(&tp->t_rawq); |
701 | if (c == -1) |
702 | goto endcase; |
703 | if (c == ' ' || c == '\t') { |
704 | (void)putc(c, &tp->t_rawq); |
705 | goto endcase; |
706 | } |
707 | ctype = ISALPHA(c); |
708 | /* |
709 | * erase rest of word |
710 | */ |
711 | do { |
712 | ttyrub(c, tp); |
713 | c = unputc(&tp->t_rawq); |
714 | if (c == -1) |
715 | goto endcase; |
716 | } while (c != ' ' && c != '\t' && |
717 | (alt == 0 || ISALPHA(c) == ctype)); |
718 | (void)putc(c, &tp->t_rawq); |
719 | goto endcase; |
720 | } |
721 | /* |
722 | * reprint line (^R) |
723 | */ |
724 | if (CCEQ(cc[VREPRINT], c)) { |
725 | ttyretype(tp); |
726 | goto endcase; |
727 | } |
728 | /* |
729 | * ^T - kernel info and generate SIGINFO |
730 | */ |
731 | if (CCEQ(cc[VSTATUS], c)) { |
732 | ttysig(tp, TTYSIG_PG1, SIGINFO); |
733 | goto endcase; |
734 | } |
735 | } |
736 | } |
737 | /* |
738 | * Check for input buffer overflow |
739 | */ |
740 | if (tp->t_rawq.c_cc + tp->t_canq.c_cc >= TTYHOG) { |
741 | if (ISSET(iflag, IMAXBEL)) { |
742 | if (tp->t_outq.c_cc < tp->t_hiwat) |
743 | (void)ttyoutput(CTRL('g'), tp); |
744 | } else |
745 | ttyflush(tp, FREAD | FWRITE); |
746 | goto endcase; |
747 | } |
748 | /* |
749 | * Put data char in q for user and |
750 | * wakeup on seeing a line delimiter. |
751 | */ |
752 | if (putc(c, &tp->t_rawq) >= 0) { |
753 | if (!ISSET(lflag, ICANON)) { |
754 | ttwakeup(tp); |
755 | ttyecho(c, tp); |
756 | goto endcase; |
757 | } |
758 | if (TTBREAKC(c, lflag)) { |
759 | tp->t_rocount = 0; |
760 | catq(&tp->t_rawq, &tp->t_canq); |
761 | ttwakeup(tp); |
762 | } else if (tp->t_rocount++ == 0) |
763 | tp->t_rocol = tp->t_column; |
764 | if (ISSET(tp->t_state, TS_ERASE)) { |
765 | /* |
766 | * end of prterase \.../ |
767 | */ |
768 | CLR(tp->t_state, TS_ERASE); |
769 | (void)ttyoutput('/', tp); |
770 | } |
771 | i = tp->t_column; |
772 | ttyecho(c, tp); |
773 | if (CCEQ(cc[VEOF], c) && ISSET(lflag, ECHO)) { |
774 | /* |
775 | * Place the cursor over the '^' of the ^D. |
776 | */ |
777 | i = min(2, tp->t_column - i); |
778 | while (i > 0) { |
779 | (void)ttyoutput('\b', tp); |
780 | i--; |
781 | } |
782 | } |
783 | } |
784 | endcase: |
785 | /* |
786 | * IXANY means allow any character to restart output. |
787 | */ |
788 | if (ISSET(tp->t_state, TS_TTSTOP) && |
789 | !ISSET(iflag, IXANY) && cc[VSTART] != cc[VSTOP]) { |
790 | return (0); |
791 | } |
792 | restartoutput: |
793 | CLR(tp->t_lflag, FLUSHO); |
794 | CLR(tp->t_state, TS_TTSTOP); |
795 | startoutput: |
796 | return (ttstart(tp)); |
797 | } |
798 | |
799 | /* |
800 | * Process input of a single character received on a tty. |
801 | * |
802 | * XXX - this is a hack, all drivers must changed to acquire the |
803 | * lock before calling linesw->l_rint() |
804 | */ |
805 | int |
806 | ttyinput(int c, struct tty *tp) |
807 | { |
808 | int error; |
809 | |
810 | /* |
811 | * Unless the receiver is enabled, drop incoming data. |
812 | */ |
813 | if (!ISSET(tp->t_cflag, CREAD)) |
814 | return (0); |
815 | |
816 | mutex_spin_enter(&tty_lock); |
817 | error = ttyinput_wlock(c, tp); |
818 | mutex_spin_exit(&tty_lock); |
819 | |
820 | return (error); |
821 | } |
822 | |
823 | /* |
824 | * Output a single character on a tty, doing output processing |
825 | * as needed (expanding tabs, newline processing, etc.). |
826 | * Returns < 0 if succeeds, otherwise returns char to resend. |
827 | * Must be recursive. |
828 | * |
829 | * Call with tty lock held. |
830 | */ |
831 | int |
832 | ttyoutput(int c, struct tty *tp) |
833 | { |
834 | long oflag; |
835 | int col, notout; |
836 | |
837 | KASSERT(mutex_owned(&tty_lock)); |
838 | |
839 | oflag = tp->t_oflag; |
840 | if (!ISSET(oflag, OPOST)) { |
841 | tk_nout++; |
842 | tp->t_outcc++; |
843 | if (!ISSET(tp->t_lflag, FLUSHO) && putc(c, &tp->t_outq)) |
844 | return (c); |
845 | return (-1); |
846 | } |
847 | /* |
848 | * Do tab expansion if OXTABS is set. Special case if we do external |
849 | * processing, we don't do the tab expansion because we'll probably |
850 | * get it wrong. If tab expansion needs to be done, let it happen |
851 | * externally. |
852 | */ |
853 | CLR(c, ~TTY_CHARMASK); |
854 | if (c == '\t' && |
855 | ISSET(oflag, OXTABS) && !ISSET(tp->t_lflag, EXTPROC)) { |
856 | c = 8 - (tp->t_column & 7); |
857 | if (ISSET(tp->t_lflag, FLUSHO)) { |
858 | notout = 0; |
859 | } else { |
860 | notout = b_to_q(" " , c, &tp->t_outq); |
861 | c -= notout; |
862 | tk_nout += c; |
863 | tp->t_outcc += c; |
864 | } |
865 | tp->t_column += c; |
866 | return (notout ? '\t' : -1); |
867 | } |
868 | if (c == CEOT && ISSET(oflag, ONOEOT)) |
869 | return (-1); |
870 | |
871 | /* |
872 | * Newline translation: if ONLCR is set, |
873 | * translate newline into "\r\n". |
874 | */ |
875 | if (c == '\n' && ISSET(tp->t_oflag, ONLCR)) { |
876 | tk_nout++; |
877 | tp->t_outcc++; |
878 | if (!ISSET(tp->t_lflag, FLUSHO) && putc('\r', &tp->t_outq)) |
879 | return (c); |
880 | } |
881 | /* If OCRNL is set, translate "\r" into "\n". */ |
882 | else if (c == '\r' && ISSET(tp->t_oflag, OCRNL)) |
883 | c = '\n'; |
884 | /* If ONOCR is set, don't transmit CRs when on column 0. */ |
885 | else if (c == '\r' && ISSET(tp->t_oflag, ONOCR) && tp->t_column == 0) |
886 | return (-1); |
887 | |
888 | tk_nout++; |
889 | tp->t_outcc++; |
890 | if (!ISSET(tp->t_lflag, FLUSHO) && putc(c, &tp->t_outq)) |
891 | return (c); |
892 | |
893 | col = tp->t_column; |
894 | switch (CCLASS(c)) { |
895 | case BACKSPACE: |
896 | if (col > 0) |
897 | --col; |
898 | break; |
899 | case CONTROL: |
900 | break; |
901 | case NEWLINE: |
902 | if (ISSET(tp->t_oflag, ONLCR | ONLRET)) |
903 | col = 0; |
904 | break; |
905 | case RETURN: |
906 | col = 0; |
907 | break; |
908 | case ORDINARY: |
909 | ++col; |
910 | break; |
911 | case TAB: |
912 | col = (col + 8) & ~7; |
913 | break; |
914 | } |
915 | tp->t_column = col; |
916 | return (-1); |
917 | } |
918 | |
919 | /* |
920 | * Ioctls for all tty devices. Called after line-discipline specific ioctl |
921 | * has been called to do discipline-specific functions and/or reject any |
922 | * of these ioctl commands. |
923 | */ |
924 | /* ARGSUSED */ |
925 | int |
926 | ttioctl(struct tty *tp, u_long cmd, void *data, int flag, struct lwp *l) |
927 | { |
928 | extern struct tty *constty; /* Temporary virtual console. */ |
929 | struct proc *p; |
930 | struct linesw *lp; |
931 | int s, error; |
932 | struct pathbuf *pb; |
933 | struct nameidata nd; |
934 | char infobuf[200]; |
935 | |
936 | KASSERT(l != NULL); |
937 | p = l->l_proc; |
938 | |
939 | /* If the ioctl involves modification, hang if in the background. */ |
940 | switch (cmd) { |
941 | case TIOCFLUSH: |
942 | case TIOCDRAIN: |
943 | case TIOCSBRK: |
944 | case TIOCCBRK: |
945 | case TIOCSTART: |
946 | case TIOCSETA: |
947 | case TIOCSETD: |
948 | case TIOCSLINED: |
949 | case TIOCSETAF: |
950 | case TIOCSETAW: |
951 | #ifdef notdef |
952 | case TIOCSPGRP: |
953 | case FIOSETOWN: |
954 | #endif |
955 | case TIOCSTAT: |
956 | case TIOCSTI: |
957 | case TIOCSWINSZ: |
958 | case TIOCSQSIZE: |
959 | case TIOCLBIC: |
960 | case TIOCLBIS: |
961 | case TIOCLSET: |
962 | case TIOCSETC: |
963 | case OTIOCSETD: |
964 | case TIOCSETN: |
965 | case TIOCSETP: |
966 | case TIOCSLTC: |
967 | mutex_spin_enter(&tty_lock); |
968 | while (isbackground(curproc, tp) && |
969 | p->p_pgrp->pg_jobc && (p->p_lflag & PL_PPWAIT) == 0 && |
970 | !sigismasked(l, SIGTTOU)) { |
971 | mutex_spin_exit(&tty_lock); |
972 | |
973 | mutex_enter(proc_lock); |
974 | pgsignal(p->p_pgrp, SIGTTOU, 1); |
975 | mutex_exit(proc_lock); |
976 | |
977 | mutex_spin_enter(&tty_lock); |
978 | error = ttypause(tp, hz); |
979 | if (error) { |
980 | mutex_spin_exit(&tty_lock); |
981 | return (error); |
982 | } |
983 | } |
984 | mutex_spin_exit(&tty_lock); |
985 | break; |
986 | } |
987 | |
988 | switch (cmd) { /* Process the ioctl. */ |
989 | case FIOASYNC: /* set/clear async i/o */ |
990 | mutex_spin_enter(&tty_lock); |
991 | if (*(int *)data) |
992 | SET(tp->t_state, TS_ASYNC); |
993 | else |
994 | CLR(tp->t_state, TS_ASYNC); |
995 | mutex_spin_exit(&tty_lock); |
996 | break; |
997 | case FIONBIO: /* set/clear non-blocking i/o */ |
998 | break; /* XXX: delete. */ |
999 | case FIONREAD: /* get # bytes to read */ |
1000 | mutex_spin_enter(&tty_lock); |
1001 | *(int *)data = ttnread(tp); |
1002 | mutex_spin_exit(&tty_lock); |
1003 | break; |
1004 | case FIONWRITE: /* get # bytes to written & unsent */ |
1005 | mutex_spin_enter(&tty_lock); |
1006 | *(int *)data = tp->t_outq.c_cc; |
1007 | mutex_spin_exit(&tty_lock); |
1008 | break; |
1009 | case FIONSPACE: /* get # bytes to written & unsent */ |
1010 | mutex_spin_enter(&tty_lock); |
1011 | *(int *)data = tp->t_outq.c_cn - tp->t_outq.c_cc; |
1012 | mutex_spin_exit(&tty_lock); |
1013 | break; |
1014 | case TIOCEXCL: /* set exclusive use of tty */ |
1015 | mutex_spin_enter(&tty_lock); |
1016 | SET(tp->t_state, TS_XCLUDE); |
1017 | mutex_spin_exit(&tty_lock); |
1018 | break; |
1019 | case TIOCFLUSH: { /* flush buffers */ |
1020 | int flags = *(int *)data; |
1021 | |
1022 | if (flags == 0) |
1023 | flags = FREAD | FWRITE; |
1024 | else |
1025 | flags &= FREAD | FWRITE; |
1026 | mutex_spin_enter(&tty_lock); |
1027 | ttyflush(tp, flags); |
1028 | mutex_spin_exit(&tty_lock); |
1029 | break; |
1030 | } |
1031 | case TIOCCONS: /* become virtual console */ |
1032 | if (*(int *)data) { |
1033 | if (constty && constty != tp && |
1034 | ISSET(constty->t_state, TS_CARR_ON | TS_ISOPEN) == |
1035 | (TS_CARR_ON | TS_ISOPEN)) |
1036 | return EBUSY; |
1037 | |
1038 | pb = pathbuf_create("/dev/console" ); |
1039 | if (pb == NULL) { |
1040 | return ENOMEM; |
1041 | } |
1042 | NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, pb); |
1043 | if ((error = namei(&nd)) != 0) { |
1044 | pathbuf_destroy(pb); |
1045 | return error; |
1046 | } |
1047 | error = VOP_ACCESS(nd.ni_vp, VREAD, l->l_cred); |
1048 | vput(nd.ni_vp); |
1049 | pathbuf_destroy(pb); |
1050 | if (error) |
1051 | return error; |
1052 | |
1053 | constty = tp; |
1054 | } else if (tp == constty) |
1055 | constty = NULL; |
1056 | break; |
1057 | case TIOCDRAIN: /* wait till output drained */ |
1058 | if ((error = ttywait(tp)) != 0) |
1059 | return (error); |
1060 | break; |
1061 | case TIOCGETA: { /* get termios struct */ |
1062 | struct termios *t = (struct termios *)data; |
1063 | |
1064 | memcpy(t, &tp->t_termios, sizeof(struct termios)); |
1065 | break; |
1066 | } |
1067 | case TIOCGETD: /* get line discipline (old) */ |
1068 | *(int *)data = tp->t_linesw->l_no; |
1069 | break; |
1070 | case TIOCGLINED: /* get line discipline (new) */ |
1071 | (void)strncpy((char *)data, tp->t_linesw->l_name, |
1072 | TTLINEDNAMELEN - 1); |
1073 | break; |
1074 | case TIOCGWINSZ: /* get window size */ |
1075 | *(struct winsize *)data = tp->t_winsize; |
1076 | break; |
1077 | case TIOCGQSIZE: |
1078 | *(int *)data = tp->t_qsize; |
1079 | break; |
1080 | case FIOGETOWN: |
1081 | mutex_enter(proc_lock); |
1082 | if (tp->t_session != NULL && !isctty(p, tp)) { |
1083 | mutex_exit(proc_lock); |
1084 | return (ENOTTY); |
1085 | } |
1086 | *(int *)data = tp->t_pgrp ? -tp->t_pgrp->pg_id : 0; |
1087 | mutex_exit(proc_lock); |
1088 | break; |
1089 | case TIOCGPGRP: /* get pgrp of tty */ |
1090 | mutex_enter(proc_lock); |
1091 | if (!isctty(p, tp)) { |
1092 | mutex_exit(proc_lock); |
1093 | return (ENOTTY); |
1094 | } |
1095 | *(int *)data = tp->t_pgrp ? tp->t_pgrp->pg_id : NO_PGID; |
1096 | mutex_exit(proc_lock); |
1097 | break; |
1098 | case TIOCGSID: /* get sid of tty */ |
1099 | mutex_enter(proc_lock); |
1100 | if (!isctty(p, tp)) { |
1101 | mutex_exit(proc_lock); |
1102 | return (ENOTTY); |
1103 | } |
1104 | *(int *)data = tp->t_session->s_sid; |
1105 | mutex_exit(proc_lock); |
1106 | break; |
1107 | #ifdef TIOCHPCL |
1108 | case TIOCHPCL: /* hang up on last close */ |
1109 | mutex_spin_enter(&tty_lock); |
1110 | SET(tp->t_cflag, HUPCL); |
1111 | mutex_spin_exit(&tty_lock); |
1112 | break; |
1113 | #endif |
1114 | case TIOCNXCL: /* reset exclusive use of tty */ |
1115 | mutex_spin_enter(&tty_lock); |
1116 | CLR(tp->t_state, TS_XCLUDE); |
1117 | mutex_spin_exit(&tty_lock); |
1118 | break; |
1119 | case TIOCOUTQ: /* output queue size */ |
1120 | *(int *)data = tp->t_outq.c_cc; |
1121 | break; |
1122 | case TIOCSETA: /* set termios struct */ |
1123 | case TIOCSETAW: /* drain output, set */ |
1124 | case TIOCSETAF: { /* drn out, fls in, set */ |
1125 | struct termios *t = (struct termios *)data; |
1126 | |
1127 | if (cmd == TIOCSETAW || cmd == TIOCSETAF) { |
1128 | if ((error = ttywait(tp)) != 0) |
1129 | return (error); |
1130 | |
1131 | if (cmd == TIOCSETAF) { |
1132 | mutex_spin_enter(&tty_lock); |
1133 | ttyflush(tp, FREAD); |
1134 | mutex_spin_exit(&tty_lock); |
1135 | } |
1136 | } |
1137 | |
1138 | s = spltty(); |
1139 | /* |
1140 | * XXXSMP - some drivers call back on us from t_param(), so |
1141 | * don't take the tty spin lock here. |
1142 | * require t_param() to unlock upon callback? |
1143 | */ |
1144 | /* wanted here: mutex_spin_enter(&tty_lock); */ |
1145 | if (!ISSET(t->c_cflag, CIGNORE)) { |
1146 | /* |
1147 | * Set device hardware. |
1148 | */ |
1149 | if (tp->t_param && (error = (*tp->t_param)(tp, t))) { |
1150 | /* wanted here: mutex_spin_exit(&tty_lock); */ |
1151 | splx(s); |
1152 | return (error); |
1153 | } else { |
1154 | tp->t_cflag = t->c_cflag; |
1155 | tp->t_ispeed = t->c_ispeed; |
1156 | tp->t_ospeed = t->c_ospeed; |
1157 | if (t->c_ospeed == 0) |
1158 | ttysig(tp, TTYSIG_LEADER, SIGHUP); |
1159 | } |
1160 | ttsetwater(tp); |
1161 | } |
1162 | |
1163 | /* delayed lock acquiring */ |
1164 | mutex_spin_enter(&tty_lock); |
1165 | if (cmd != TIOCSETAF) { |
1166 | if (ISSET(t->c_lflag, ICANON) != |
1167 | ISSET(tp->t_lflag, ICANON)) { |
1168 | if (ISSET(t->c_lflag, ICANON)) { |
1169 | SET(tp->t_lflag, PENDIN); |
1170 | ttwakeup(tp); |
1171 | } else { |
1172 | struct clist tq; |
1173 | |
1174 | catq(&tp->t_rawq, &tp->t_canq); |
1175 | tq = tp->t_rawq; |
1176 | tp->t_rawq = tp->t_canq; |
1177 | tp->t_canq = tq; |
1178 | CLR(tp->t_lflag, PENDIN); |
1179 | } |
1180 | } |
1181 | } |
1182 | tp->t_iflag = t->c_iflag; |
1183 | tp->t_oflag = t->c_oflag; |
1184 | /* |
1185 | * Make the EXTPROC bit read only. |
1186 | */ |
1187 | if (ISSET(tp->t_lflag, EXTPROC)) |
1188 | SET(t->c_lflag, EXTPROC); |
1189 | else |
1190 | CLR(t->c_lflag, EXTPROC); |
1191 | tp->t_lflag = t->c_lflag | ISSET(tp->t_lflag, PENDIN); |
1192 | memcpy(tp->t_cc, t->c_cc, sizeof(t->c_cc)); |
1193 | mutex_spin_exit(&tty_lock); |
1194 | splx(s); |
1195 | break; |
1196 | } |
1197 | case TIOCSETD: /* set line discipline (old) */ |
1198 | lp = ttyldisc_lookup_bynum(*(int *)data); |
1199 | goto setldisc; |
1200 | |
1201 | case TIOCSLINED: { /* set line discipline (new) */ |
1202 | char *name = (char *)data; |
1203 | dev_t device; |
1204 | |
1205 | /* Null terminate to prevent buffer overflow */ |
1206 | name[TTLINEDNAMELEN - 1] = '\0'; |
1207 | lp = ttyldisc_lookup(name); |
1208 | setldisc: |
1209 | if (lp == NULL) |
1210 | return (ENXIO); |
1211 | |
1212 | if (lp != tp->t_linesw) { |
1213 | device = tp->t_dev; |
1214 | s = spltty(); |
1215 | (*tp->t_linesw->l_close)(tp, flag); |
1216 | error = (*lp->l_open)(device, tp); |
1217 | if (error) { |
1218 | (void)(*tp->t_linesw->l_open)(device, tp); |
1219 | splx(s); |
1220 | ttyldisc_release(lp); |
1221 | return (error); |
1222 | } |
1223 | ttyldisc_release(tp->t_linesw); |
1224 | tp->t_linesw = lp; |
1225 | splx(s); |
1226 | } else { |
1227 | /* Drop extra reference. */ |
1228 | ttyldisc_release(lp); |
1229 | } |
1230 | break; |
1231 | } |
1232 | case TIOCSTART: /* start output, like ^Q */ |
1233 | mutex_spin_enter(&tty_lock); |
1234 | if (ISSET(tp->t_state, TS_TTSTOP) || |
1235 | ISSET(tp->t_lflag, FLUSHO)) { |
1236 | CLR(tp->t_lflag, FLUSHO); |
1237 | CLR(tp->t_state, TS_TTSTOP); |
1238 | ttstart(tp); |
1239 | } |
1240 | mutex_spin_exit(&tty_lock); |
1241 | break; |
1242 | case TIOCSTI: /* simulate terminal input */ |
1243 | if ((error = kauth_authorize_device_tty(l->l_cred, |
1244 | KAUTH_DEVICE_TTY_STI, tp)) != 0) { |
1245 | if (!ISSET(flag, FREAD)) |
1246 | return EPERM; |
1247 | if (!isctty(p, tp)) |
1248 | return EACCES; |
1249 | if (tp->t_session->s_leader->p_cred != p->p_cred) |
1250 | return error; |
1251 | } |
1252 | (*tp->t_linesw->l_rint)(*(u_char *)data, tp); |
1253 | break; |
1254 | case TIOCSTOP: /* stop output, like ^S */ |
1255 | { |
1256 | mutex_spin_enter(&tty_lock); |
1257 | if (!ISSET(tp->t_state, TS_TTSTOP)) { |
1258 | SET(tp->t_state, TS_TTSTOP); |
1259 | cdev_stop(tp, 0); |
1260 | } |
1261 | mutex_spin_exit(&tty_lock); |
1262 | break; |
1263 | } |
1264 | case TIOCSCTTY: /* become controlling tty */ |
1265 | mutex_enter(proc_lock); |
1266 | mutex_spin_enter(&tty_lock); |
1267 | |
1268 | /* Session ctty vnode pointer set in vnode layer. */ |
1269 | if (!SESS_LEADER(p) || |
1270 | ((p->p_session->s_ttyvp || tp->t_session) && |
1271 | (tp->t_session != p->p_session))) { |
1272 | mutex_spin_exit(&tty_lock); |
1273 | mutex_exit(proc_lock); |
1274 | return (EPERM); |
1275 | } |
1276 | |
1277 | /* |
1278 | * `p_session' acquires a reference. |
1279 | * But note that if `t_session' is set at this point, |
1280 | * it must equal `p_session', in which case the session |
1281 | * already has the correct reference count. |
1282 | */ |
1283 | if (tp->t_session == NULL) { |
1284 | proc_sesshold(p->p_session); |
1285 | } |
1286 | tp->t_session = p->p_session; |
1287 | tp->t_pgrp = p->p_pgrp; |
1288 | p->p_session->s_ttyp = tp; |
1289 | p->p_lflag |= PL_CONTROLT; |
1290 | mutex_spin_exit(&tty_lock); |
1291 | mutex_exit(proc_lock); |
1292 | break; |
1293 | case FIOSETOWN: { /* set pgrp of tty */ |
1294 | pid_t pgid = *(pid_t *)data; |
1295 | struct pgrp *pgrp; |
1296 | |
1297 | mutex_enter(proc_lock); |
1298 | if (tp->t_session != NULL && !isctty(p, tp)) { |
1299 | mutex_exit(proc_lock); |
1300 | return (ENOTTY); |
1301 | } |
1302 | |
1303 | if (pgid < 0) { |
1304 | pgrp = pgrp_find(-pgid); |
1305 | if (pgrp == NULL) { |
1306 | mutex_exit(proc_lock); |
1307 | return (EINVAL); |
1308 | } |
1309 | } else { |
1310 | struct proc *p1; |
1311 | p1 = proc_find(pgid); |
1312 | if (!p1) { |
1313 | mutex_exit(proc_lock); |
1314 | return (ESRCH); |
1315 | } |
1316 | pgrp = p1->p_pgrp; |
1317 | } |
1318 | |
1319 | if (pgrp->pg_session != p->p_session) { |
1320 | mutex_exit(proc_lock); |
1321 | return (EPERM); |
1322 | } |
1323 | mutex_spin_enter(&tty_lock); |
1324 | tp->t_pgrp = pgrp; |
1325 | mutex_spin_exit(&tty_lock); |
1326 | mutex_exit(proc_lock); |
1327 | break; |
1328 | } |
1329 | case TIOCSPGRP: { /* set pgrp of tty */ |
1330 | struct pgrp *pgrp; |
1331 | pid_t pgid = *(pid_t *)data; |
1332 | |
1333 | if (pgid == NO_PGID) |
1334 | return EINVAL; |
1335 | |
1336 | mutex_enter(proc_lock); |
1337 | if (!isctty(p, tp)) { |
1338 | mutex_exit(proc_lock); |
1339 | return (ENOTTY); |
1340 | } |
1341 | pgrp = pgrp_find(pgid); |
1342 | if (pgrp == NULL || pgrp->pg_session != p->p_session) { |
1343 | mutex_exit(proc_lock); |
1344 | return (EPERM); |
1345 | } |
1346 | mutex_spin_enter(&tty_lock); |
1347 | tp->t_pgrp = pgrp; |
1348 | mutex_spin_exit(&tty_lock); |
1349 | mutex_exit(proc_lock); |
1350 | break; |
1351 | } |
1352 | case TIOCSTAT: /* get load avg stats */ |
1353 | mutex_enter(proc_lock); |
1354 | ttygetinfo(tp, 0, infobuf, sizeof(infobuf)); |
1355 | mutex_exit(proc_lock); |
1356 | |
1357 | mutex_spin_enter(&tty_lock); |
1358 | ttyputinfo(tp, infobuf); |
1359 | mutex_spin_exit(&tty_lock); |
1360 | break; |
1361 | case TIOCSWINSZ: /* set window size */ |
1362 | mutex_spin_enter(&tty_lock); |
1363 | if (memcmp((void *)&tp->t_winsize, data, |
1364 | sizeof(struct winsize))) { |
1365 | tp->t_winsize = *(struct winsize *)data; |
1366 | ttysig(tp, TTYSIG_PG1, SIGWINCH); |
1367 | } |
1368 | mutex_spin_exit(&tty_lock); |
1369 | break; |
1370 | case TIOCSQSIZE: |
1371 | if ((error = tty_get_qsize(&s, *(int *)data)) == 0 && |
1372 | s != tp->t_qsize) |
1373 | error = tty_set_qsize(tp, s); |
1374 | return error; |
1375 | |
1376 | case TIOCSBRK: |
1377 | case TIOCCBRK: |
1378 | case TIOCSDTR: |
1379 | case TIOCCDTR: |
1380 | case TIOCSFLAGS: |
1381 | case TIOCGFLAGS: |
1382 | case TIOCMSET: |
1383 | case TIOCMGET: |
1384 | case TIOCMBIS: |
1385 | case TIOCMBIC: |
1386 | /* Handled by the driver layer */ |
1387 | return EPASSTHROUGH; |
1388 | |
1389 | case TIOCEXT: |
1390 | case TIOCPTSNAME: |
1391 | case TIOCGRANTPT: |
1392 | case TIOCPKT: |
1393 | case TIOCUCNTL: |
1394 | case TIOCREMOTE: |
1395 | case TIOCSIG: |
1396 | /* for ptys */ |
1397 | return EPASSTHROUGH; |
1398 | |
1399 | default: |
1400 | /* Pass through various console ioctls */ |
1401 | switch (IOCGROUP(cmd)) { |
1402 | case 'c': /* syscons console */ |
1403 | case 'v': /* usl console, video - where one letter */ |
1404 | case 'K': /* usl console, keyboard - aint enough */ |
1405 | case 'V': /* pcvt compat */ |
1406 | case 'W': /* wscons console */ |
1407 | return EPASSTHROUGH; |
1408 | default: |
1409 | break; |
1410 | } |
1411 | #ifdef COMPAT_60 |
1412 | error = compat_60_ttioctl(tp, cmd, data, flag, l); |
1413 | if (error != EPASSTHROUGH) |
1414 | return error; |
1415 | #endif /* COMPAT_60 */ |
1416 | /* We may have to load the compat module for this. */ |
1417 | for (;;) { |
1418 | rw_enter(&ttcompat_lock, RW_READER); |
1419 | if (ttcompatvec != NULL) { |
1420 | break; |
1421 | } |
1422 | rw_exit(&ttcompat_lock); |
1423 | (void)module_autoload("compat" , MODULE_CLASS_ANY); |
1424 | if (ttcompatvec == NULL) { |
1425 | return EPASSTHROUGH; |
1426 | } |
1427 | } |
1428 | error = (*ttcompatvec)(tp, cmd, data, flag, l); |
1429 | rw_exit(&ttcompat_lock); |
1430 | return error; |
1431 | } |
1432 | return (0); |
1433 | } |
1434 | |
1435 | int |
1436 | ttpoll(struct tty *tp, int events, struct lwp *l) |
1437 | { |
1438 | int revents; |
1439 | |
1440 | revents = 0; |
1441 | mutex_spin_enter(&tty_lock); |
1442 | if (events & (POLLIN | POLLRDNORM)) |
1443 | if (ttnread(tp) > 0) |
1444 | revents |= events & (POLLIN | POLLRDNORM); |
1445 | |
1446 | if (events & (POLLOUT | POLLWRNORM)) |
1447 | if (tp->t_outq.c_cc <= tp->t_lowat) |
1448 | revents |= events & (POLLOUT | POLLWRNORM); |
1449 | |
1450 | if (events & POLLHUP) |
1451 | if (!CONNECTED(tp)) |
1452 | revents |= POLLHUP; |
1453 | |
1454 | if (revents == 0) { |
1455 | if (events & (POLLIN | POLLHUP | POLLRDNORM)) |
1456 | selrecord(l, &tp->t_rsel); |
1457 | |
1458 | if (events & (POLLOUT | POLLWRNORM)) |
1459 | selrecord(l, &tp->t_wsel); |
1460 | } |
1461 | |
1462 | mutex_spin_exit(&tty_lock); |
1463 | |
1464 | return (revents); |
1465 | } |
1466 | |
1467 | static void |
1468 | filt_ttyrdetach(struct knote *kn) |
1469 | { |
1470 | struct tty *tp; |
1471 | |
1472 | tp = kn->kn_hook; |
1473 | mutex_spin_enter(&tty_lock); |
1474 | SLIST_REMOVE(&tp->t_rsel.sel_klist, kn, knote, kn_selnext); |
1475 | mutex_spin_exit(&tty_lock); |
1476 | } |
1477 | |
1478 | static int |
1479 | filt_ttyread(struct knote *kn, long hint) |
1480 | { |
1481 | struct tty *tp; |
1482 | |
1483 | tp = kn->kn_hook; |
1484 | if ((hint & NOTE_SUBMIT) == 0) |
1485 | mutex_spin_enter(&tty_lock); |
1486 | kn->kn_data = ttnread(tp); |
1487 | if ((hint & NOTE_SUBMIT) == 0) |
1488 | mutex_spin_exit(&tty_lock); |
1489 | return (kn->kn_data > 0); |
1490 | } |
1491 | |
1492 | static void |
1493 | filt_ttywdetach(struct knote *kn) |
1494 | { |
1495 | struct tty *tp; |
1496 | |
1497 | tp = kn->kn_hook; |
1498 | mutex_spin_enter(&tty_lock); |
1499 | SLIST_REMOVE(&tp->t_wsel.sel_klist, kn, knote, kn_selnext); |
1500 | mutex_spin_exit(&tty_lock); |
1501 | } |
1502 | |
1503 | static int |
1504 | filt_ttywrite(struct knote *kn, long hint) |
1505 | { |
1506 | struct tty *tp; |
1507 | int canwrite; |
1508 | |
1509 | tp = kn->kn_hook; |
1510 | if ((hint & NOTE_SUBMIT) == 0) |
1511 | mutex_spin_enter(&tty_lock); |
1512 | kn->kn_data = tp->t_outq.c_cn - tp->t_outq.c_cc; |
1513 | canwrite = (tp->t_outq.c_cc <= tp->t_lowat) && CONNECTED(tp); |
1514 | if ((hint & NOTE_SUBMIT) == 0) |
1515 | mutex_spin_exit(&tty_lock); |
1516 | return (canwrite); |
1517 | } |
1518 | |
1519 | static const struct filterops ttyread_filtops = |
1520 | { 1, NULL, filt_ttyrdetach, filt_ttyread }; |
1521 | static const struct filterops ttywrite_filtops = |
1522 | { 1, NULL, filt_ttywdetach, filt_ttywrite }; |
1523 | |
1524 | int |
1525 | ttykqfilter(dev_t dev, struct knote *kn) |
1526 | { |
1527 | struct tty *tp; |
1528 | struct klist *klist; |
1529 | |
1530 | if ((tp = cdev_tty(dev)) == NULL) |
1531 | return (ENXIO); |
1532 | |
1533 | switch (kn->kn_filter) { |
1534 | case EVFILT_READ: |
1535 | klist = &tp->t_rsel.sel_klist; |
1536 | kn->kn_fop = &ttyread_filtops; |
1537 | break; |
1538 | case EVFILT_WRITE: |
1539 | klist = &tp->t_wsel.sel_klist; |
1540 | kn->kn_fop = &ttywrite_filtops; |
1541 | break; |
1542 | default: |
1543 | return EINVAL; |
1544 | } |
1545 | |
1546 | kn->kn_hook = tp; |
1547 | |
1548 | mutex_spin_enter(&tty_lock); |
1549 | SLIST_INSERT_HEAD(klist, kn, kn_selnext); |
1550 | mutex_spin_exit(&tty_lock); |
1551 | |
1552 | return (0); |
1553 | } |
1554 | |
1555 | /* |
1556 | * Find the number of chars ready to be read from this tty. |
1557 | * Call with the tty lock held. |
1558 | */ |
1559 | static int |
1560 | ttnread(struct tty *tp) |
1561 | { |
1562 | int nread; |
1563 | |
1564 | KASSERT(mutex_owned(&tty_lock)); |
1565 | |
1566 | if (ISSET(tp->t_lflag, PENDIN)) |
1567 | ttypend(tp); |
1568 | nread = tp->t_canq.c_cc; |
1569 | if (!ISSET(tp->t_lflag, ICANON)) { |
1570 | nread += tp->t_rawq.c_cc; |
1571 | if (nread < tp->t_cc[VMIN] && !tp->t_cc[VTIME]) |
1572 | nread = 0; |
1573 | } |
1574 | return (nread); |
1575 | } |
1576 | |
1577 | /* |
1578 | * Wait for output to drain, or if this times out, flush it. |
1579 | */ |
1580 | static int |
1581 | ttywait_timo(struct tty *tp, int timo) |
1582 | { |
1583 | int error; |
1584 | |
1585 | error = 0; |
1586 | |
1587 | mutex_spin_enter(&tty_lock); |
1588 | while ((tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY)) && |
1589 | CONNECTED(tp) && tp->t_oproc) { |
1590 | (*tp->t_oproc)(tp); |
1591 | error = ttysleep(tp, &tp->t_outcv, true, timo); |
1592 | if (error == EWOULDBLOCK) |
1593 | ttyflush(tp, FWRITE); |
1594 | if (error) |
1595 | break; |
1596 | } |
1597 | mutex_spin_exit(&tty_lock); |
1598 | |
1599 | return (error); |
1600 | } |
1601 | |
1602 | /* |
1603 | * Wait for output to drain. |
1604 | */ |
1605 | int |
1606 | ttywait(struct tty *tp) |
1607 | { |
1608 | return ttywait_timo(tp, 0); |
1609 | } |
1610 | |
1611 | /* |
1612 | * Flush if successfully wait. |
1613 | */ |
1614 | int |
1615 | ttywflush(struct tty *tp) |
1616 | { |
1617 | int error; |
1618 | |
1619 | error = ttywait_timo(tp, 5 * hz); |
1620 | if (error == 0 || error == EWOULDBLOCK) { |
1621 | mutex_spin_enter(&tty_lock); |
1622 | ttyflush(tp, FREAD); |
1623 | mutex_spin_exit(&tty_lock); |
1624 | } |
1625 | return (error); |
1626 | } |
1627 | |
1628 | /* |
1629 | * Flush tty read and/or write queues, notifying anyone waiting. |
1630 | * Call with the tty lock held. |
1631 | */ |
1632 | void |
1633 | ttyflush(struct tty *tp, int rw) |
1634 | { |
1635 | |
1636 | KASSERT(mutex_owned(&tty_lock)); |
1637 | |
1638 | if (rw & FREAD) { |
1639 | FLUSHQ(&tp->t_canq); |
1640 | FLUSHQ(&tp->t_rawq); |
1641 | tp->t_rocount = 0; |
1642 | tp->t_rocol = 0; |
1643 | CLR(tp->t_state, TS_LOCAL); |
1644 | ttwakeup(tp); |
1645 | } |
1646 | if (rw & FWRITE) { |
1647 | CLR(tp->t_state, TS_TTSTOP); |
1648 | cdev_stop(tp, rw); |
1649 | FLUSHQ(&tp->t_outq); |
1650 | cv_broadcast(&tp->t_outcv); |
1651 | selnotify(&tp->t_wsel, 0, NOTE_SUBMIT); |
1652 | } |
1653 | } |
1654 | |
1655 | /* |
1656 | * Copy in the default termios characters. |
1657 | */ |
1658 | void |
1659 | ttychars(struct tty *tp) |
1660 | { |
1661 | |
1662 | memcpy(tp->t_cc, ttydefchars, sizeof(ttydefchars)); |
1663 | } |
1664 | |
1665 | /* |
1666 | * Send stop character on input overflow. |
1667 | * Call with the tty lock held. |
1668 | */ |
1669 | static void |
1670 | ttyblock(struct tty *tp) |
1671 | { |
1672 | int total; |
1673 | |
1674 | KASSERT(mutex_owned(&tty_lock)); |
1675 | |
1676 | total = tp->t_rawq.c_cc + tp->t_canq.c_cc; |
1677 | if (tp->t_rawq.c_cc > TTYHOG) { |
1678 | ttyflush(tp, FREAD | FWRITE); |
1679 | CLR(tp->t_state, TS_TBLOCK); |
1680 | } |
1681 | /* |
1682 | * Block further input iff: current input > threshold |
1683 | * AND input is available to user program. |
1684 | */ |
1685 | if (total >= TTYHOG / 2 && |
1686 | !ISSET(tp->t_state, TS_TBLOCK) && |
1687 | (!ISSET(tp->t_lflag, ICANON) || tp->t_canq.c_cc > 0)) { |
1688 | if (ISSET(tp->t_iflag, IXOFF) && |
1689 | tp->t_cc[VSTOP] != _POSIX_VDISABLE && |
1690 | putc(tp->t_cc[VSTOP], &tp->t_outq) == 0) { |
1691 | SET(tp->t_state, TS_TBLOCK); |
1692 | ttstart(tp); |
1693 | } |
1694 | /* Try to block remote output via hardware flow control. */ |
1695 | if (ISSET(tp->t_cflag, CHWFLOW) && tp->t_hwiflow && |
1696 | (*tp->t_hwiflow)(tp, 1) != 0) |
1697 | SET(tp->t_state, TS_TBLOCK); |
1698 | } |
1699 | } |
1700 | |
1701 | /* |
1702 | * Delayed line discipline output |
1703 | */ |
1704 | void |
1705 | ttrstrt(void *tp_arg) |
1706 | { |
1707 | struct tty *tp; |
1708 | |
1709 | #ifdef DIAGNOSTIC |
1710 | if (tp_arg == NULL) |
1711 | panic("ttrstrt" ); |
1712 | #endif |
1713 | tp = tp_arg; |
1714 | mutex_spin_enter(&tty_lock); |
1715 | |
1716 | CLR(tp->t_state, TS_TIMEOUT); |
1717 | ttstart(tp); /* XXX - Shouldn't this be tp->l_start(tp)? */ |
1718 | |
1719 | mutex_spin_exit(&tty_lock); |
1720 | } |
1721 | |
1722 | /* |
1723 | * start a line discipline |
1724 | * Always call with tty lock held? |
1725 | */ |
1726 | int |
1727 | ttstart(struct tty *tp) |
1728 | { |
1729 | |
1730 | if (tp->t_oproc != NULL) /* XXX: Kludge for pty. */ |
1731 | (*tp->t_oproc)(tp); |
1732 | return (0); |
1733 | } |
1734 | |
1735 | /* |
1736 | * "close" a line discipline |
1737 | */ |
1738 | int |
1739 | ttylclose(struct tty *tp, int flag) |
1740 | { |
1741 | |
1742 | if (flag & FNONBLOCK) { |
1743 | mutex_spin_enter(&tty_lock); |
1744 | ttyflush(tp, FREAD | FWRITE); |
1745 | mutex_spin_exit(&tty_lock); |
1746 | } else |
1747 | ttywflush(tp); |
1748 | return (0); |
1749 | } |
1750 | |
1751 | /* |
1752 | * Handle modem control transition on a tty. |
1753 | * Flag indicates new state of carrier. |
1754 | * Returns 0 if the line should be turned off, otherwise 1. |
1755 | */ |
1756 | int |
1757 | ttymodem(struct tty *tp, int flag) |
1758 | { |
1759 | |
1760 | mutex_spin_enter(&tty_lock); |
1761 | if (flag == 0) { |
1762 | if (ISSET(tp->t_state, TS_CARR_ON)) { |
1763 | /* |
1764 | * Lost carrier. |
1765 | */ |
1766 | CLR(tp->t_state, TS_CARR_ON); |
1767 | if (ISSET(tp->t_state, TS_ISOPEN) && !CONNECTED(tp)) { |
1768 | ttysig(tp, TTYSIG_LEADER, SIGHUP); |
1769 | ttyflush(tp, FREAD | FWRITE); |
1770 | mutex_spin_exit(&tty_lock); |
1771 | return (0); |
1772 | } |
1773 | } |
1774 | } else { |
1775 | if (!ISSET(tp->t_state, TS_CARR_ON)) { |
1776 | /* |
1777 | * Carrier now on. |
1778 | */ |
1779 | SET(tp->t_state, TS_CARR_ON); |
1780 | ttwakeup(tp); |
1781 | } |
1782 | } |
1783 | mutex_spin_exit(&tty_lock); |
1784 | |
1785 | return (1); |
1786 | } |
1787 | |
1788 | /* |
1789 | * Default modem control routine (for other line disciplines). |
1790 | * Return argument flag, to turn off device on carrier drop. |
1791 | */ |
1792 | int |
1793 | nullmodem(struct tty *tp, int flag) |
1794 | { |
1795 | |
1796 | mutex_spin_enter(&tty_lock); |
1797 | if (flag) |
1798 | SET(tp->t_state, TS_CARR_ON); |
1799 | else { |
1800 | CLR(tp->t_state, TS_CARR_ON); |
1801 | if (!CONNECTED(tp)) { |
1802 | ttysig(tp, TTYSIG_LEADER, SIGHUP); |
1803 | mutex_spin_exit(&tty_lock); |
1804 | return (0); |
1805 | } |
1806 | } |
1807 | mutex_spin_exit(&tty_lock); |
1808 | |
1809 | return (1); |
1810 | } |
1811 | |
1812 | /* |
1813 | * Reinput pending characters after state switch. |
1814 | */ |
1815 | void |
1816 | ttypend(struct tty *tp) |
1817 | { |
1818 | struct clist tq; |
1819 | int c; |
1820 | |
1821 | KASSERT(mutex_owned(&tty_lock)); |
1822 | |
1823 | CLR(tp->t_lflag, PENDIN); |
1824 | SET(tp->t_state, TS_TYPEN); |
1825 | tq = tp->t_rawq; |
1826 | tp->t_rawq.c_cc = 0; |
1827 | tp->t_rawq.c_cf = tp->t_rawq.c_cl = 0; |
1828 | while ((c = getc(&tq)) >= 0) |
1829 | ttyinput_wlock(c, tp); |
1830 | CLR(tp->t_state, TS_TYPEN); |
1831 | } |
1832 | |
1833 | /* |
1834 | * Process a read call on a tty device. |
1835 | */ |
1836 | int |
1837 | ttread(struct tty *tp, struct uio *uio, int flag) |
1838 | { |
1839 | struct clist *qp; |
1840 | u_char *cc; |
1841 | struct proc *p; |
1842 | int c, first, error, has_stime, last_cc; |
1843 | long lflag, slp; |
1844 | struct timeval now, stime; |
1845 | |
1846 | if (uio->uio_resid == 0) |
1847 | return 0; |
1848 | |
1849 | stime.tv_usec = 0; /* XXX gcc */ |
1850 | stime.tv_sec = 0; /* XXX gcc */ |
1851 | |
1852 | cc = tp->t_cc; |
1853 | p = curproc; |
1854 | error = 0; |
1855 | has_stime = 0; |
1856 | last_cc = 0; |
1857 | slp = 0; |
1858 | |
1859 | loop: |
1860 | mutex_spin_enter(&tty_lock); |
1861 | lflag = tp->t_lflag; |
1862 | /* |
1863 | * take pending input first |
1864 | */ |
1865 | if (ISSET(lflag, PENDIN)) |
1866 | ttypend(tp); |
1867 | |
1868 | /* |
1869 | * Hang process if it's in the background. |
1870 | */ |
1871 | if (isbackground(p, tp)) { |
1872 | if (sigismasked(curlwp, SIGTTIN) || |
1873 | p->p_lflag & PL_PPWAIT || p->p_pgrp->pg_jobc == 0) { |
1874 | mutex_spin_exit(&tty_lock); |
1875 | return (EIO); |
1876 | } |
1877 | mutex_spin_exit(&tty_lock); |
1878 | |
1879 | mutex_enter(proc_lock); |
1880 | pgsignal(p->p_pgrp, SIGTTIN, 1); |
1881 | mutex_exit(proc_lock); |
1882 | |
1883 | mutex_spin_enter(&tty_lock); |
1884 | error = ttypause(tp, hz); |
1885 | mutex_spin_exit(&tty_lock); |
1886 | if (error) |
1887 | return (error); |
1888 | goto loop; |
1889 | } |
1890 | |
1891 | if (!ISSET(lflag, ICANON)) { |
1892 | int m = cc[VMIN]; |
1893 | long t = cc[VTIME]; |
1894 | |
1895 | qp = &tp->t_rawq; |
1896 | /* |
1897 | * Check each of the four combinations. |
1898 | * (m > 0 && t == 0) is the normal read case. |
1899 | * It should be fairly efficient, so we check that and its |
1900 | * companion case (m == 0 && t == 0) first. |
1901 | * For the other two cases, we compute the target sleep time |
1902 | * into slp. |
1903 | */ |
1904 | if (t == 0) { |
1905 | if (qp->c_cc < m) |
1906 | goto sleep; |
1907 | goto read; |
1908 | } |
1909 | t *= hz; /* time in deca-ticks */ |
1910 | /* |
1911 | * Time difference in deca-ticks, split division to avoid numeric overflow. |
1912 | * Ok for hz < ~200kHz |
1913 | */ |
1914 | #define diff(t1, t2) (((t1).tv_sec - (t2).tv_sec) * 10 * hz + \ |
1915 | ((t1).tv_usec - (t2).tv_usec) / 100 * hz / 1000) |
1916 | if (m > 0) { |
1917 | if (qp->c_cc <= 0) |
1918 | goto sleep; |
1919 | if (qp->c_cc >= m) |
1920 | goto read; |
1921 | if (!has_stime) { |
1922 | /* first character, start timer */ |
1923 | has_stime = 1; |
1924 | getmicrotime(&stime); |
1925 | slp = t; |
1926 | } else if (qp->c_cc > last_cc) { |
1927 | /* got a character, restart timer */ |
1928 | getmicrotime(&stime); |
1929 | slp = t; |
1930 | } else { |
1931 | /* nothing, check expiration */ |
1932 | getmicrotime(&now); |
1933 | slp = t - diff(now, stime); |
1934 | } |
1935 | } else { /* m == 0 */ |
1936 | if (qp->c_cc > 0) |
1937 | goto read; |
1938 | if (!has_stime) { |
1939 | has_stime = 1; |
1940 | getmicrotime(&stime); |
1941 | slp = t; |
1942 | } else { |
1943 | getmicrotime(&now); |
1944 | slp = t - diff(now, stime); |
1945 | } |
1946 | } |
1947 | last_cc = qp->c_cc; |
1948 | #undef diff |
1949 | if (slp > 0) { |
1950 | /* |
1951 | * Convert deca-ticks back to ticks. |
1952 | * Rounding down may make us wake up just short |
1953 | * of the target, so we round up. |
1954 | * Maybe we should do 'slp/10 + 1' because the |
1955 | * first tick maybe almost immediate. |
1956 | * However it is more useful for a program that sets |
1957 | * VTIME=10 to wakeup every second not every 1.01 |
1958 | * seconds (if hz=100). |
1959 | */ |
1960 | slp = (slp + 9)/ 10; |
1961 | goto sleep; |
1962 | } |
1963 | } else if ((qp = &tp->t_canq)->c_cc <= 0) { |
1964 | int carrier; |
1965 | |
1966 | sleep: |
1967 | /* |
1968 | * If there is no input, sleep on rawq |
1969 | * awaiting hardware receipt and notification. |
1970 | * If we have data, we don't need to check for carrier. |
1971 | */ |
1972 | carrier = CONNECTED(tp); |
1973 | if (!carrier && ISSET(tp->t_state, TS_ISOPEN)) { |
1974 | mutex_spin_exit(&tty_lock); |
1975 | return (0); /* EOF */ |
1976 | } |
1977 | if (!has_stime || slp <= 0) { |
1978 | if (flag & IO_NDELAY) { |
1979 | mutex_spin_exit(&tty_lock); |
1980 | return (EWOULDBLOCK); |
1981 | } |
1982 | } |
1983 | error = ttysleep(tp, &tp->t_rawcv, true, slp); |
1984 | mutex_spin_exit(&tty_lock); |
1985 | /* VMIN == 0: any quantity read satisfies */ |
1986 | if (cc[VMIN] == 0 && error == EWOULDBLOCK) |
1987 | return (0); |
1988 | if (error && error != EWOULDBLOCK) |
1989 | return (error); |
1990 | goto loop; |
1991 | } |
1992 | read: |
1993 | |
1994 | /* |
1995 | * Input present, check for input mapping and processing. |
1996 | */ |
1997 | first = 1; |
1998 | while ((c = getc(qp)) >= 0) { |
1999 | /* |
2000 | * delayed suspend (^Y) |
2001 | */ |
2002 | if (CCEQ(cc[VDSUSP], c) && |
2003 | ISSET(lflag, IEXTEN|ISIG) == (IEXTEN|ISIG)) { |
2004 | ttysig(tp, TTYSIG_PG1, SIGTSTP); |
2005 | if (first) { |
2006 | error = ttypause(tp, hz); |
2007 | if (error) |
2008 | break; |
2009 | mutex_spin_exit(&tty_lock); |
2010 | goto loop; |
2011 | } |
2012 | break; |
2013 | } |
2014 | /* |
2015 | * Interpret EOF only in canonical mode. |
2016 | */ |
2017 | if (CCEQ(cc[VEOF], c) && ISSET(lflag, ICANON)) |
2018 | break; |
2019 | /* |
2020 | * Give user character. |
2021 | */ |
2022 | mutex_spin_exit(&tty_lock); |
2023 | error = ureadc(c, uio); |
2024 | mutex_spin_enter(&tty_lock); |
2025 | if (error) |
2026 | break; |
2027 | if (uio->uio_resid == 0) |
2028 | break; |
2029 | /* |
2030 | * In canonical mode check for a "break character" |
2031 | * marking the end of a "line of input". |
2032 | */ |
2033 | if (ISSET(lflag, ICANON) && TTBREAKC(c, lflag)) |
2034 | break; |
2035 | first = 0; |
2036 | } |
2037 | |
2038 | /* |
2039 | * Look to unblock output now that (presumably) |
2040 | * the input queue has gone down. |
2041 | */ |
2042 | if (ISSET(tp->t_state, TS_TBLOCK) && tp->t_rawq.c_cc < TTYHOG / 5) { |
2043 | if (ISSET(tp->t_iflag, IXOFF) && |
2044 | cc[VSTART] != _POSIX_VDISABLE && |
2045 | putc(cc[VSTART], &tp->t_outq) == 0) { |
2046 | CLR(tp->t_state, TS_TBLOCK); |
2047 | ttstart(tp); |
2048 | } |
2049 | /* Try to unblock remote output via hardware flow control. */ |
2050 | if (ISSET(tp->t_cflag, CHWFLOW) && tp->t_hwiflow && |
2051 | (*tp->t_hwiflow)(tp, 0) != 0) |
2052 | CLR(tp->t_state, TS_TBLOCK); |
2053 | } |
2054 | mutex_spin_exit(&tty_lock); |
2055 | |
2056 | return (error); |
2057 | } |
2058 | |
2059 | /* |
2060 | * Check the output queue on tp for space for a kernel message (from uprintf |
2061 | * or tprintf). Allow some space over the normal hiwater mark so we don't |
2062 | * lose messages due to normal flow control, but don't let the tty run amok. |
2063 | * Sleeps here are not interruptible, but we return prematurely if new signals |
2064 | * arrive. |
2065 | * Call with tty lock held. |
2066 | */ |
2067 | static int |
2068 | ttycheckoutq_wlock(struct tty *tp, int wait) |
2069 | { |
2070 | int hiwat, error; |
2071 | |
2072 | KASSERT(mutex_owned(&tty_lock)); |
2073 | |
2074 | hiwat = tp->t_hiwat; |
2075 | if (tp->t_outq.c_cc > hiwat + 200) |
2076 | while (tp->t_outq.c_cc > hiwat) { |
2077 | ttstart(tp); |
2078 | if (wait == 0) |
2079 | return (0); |
2080 | error = ttysleep(tp, &tp->t_outcv, true, hz); |
2081 | if (error == EINTR) |
2082 | wait = 0; |
2083 | } |
2084 | |
2085 | return (1); |
2086 | } |
2087 | |
2088 | int |
2089 | ttycheckoutq(struct tty *tp, int wait) |
2090 | { |
2091 | int r; |
2092 | |
2093 | mutex_spin_enter(&tty_lock); |
2094 | r = ttycheckoutq_wlock(tp, wait); |
2095 | mutex_spin_exit(&tty_lock); |
2096 | |
2097 | return (r); |
2098 | } |
2099 | |
2100 | /* |
2101 | * Process a write call on a tty device. |
2102 | */ |
2103 | int |
2104 | ttwrite(struct tty *tp, struct uio *uio, int flag) |
2105 | { |
2106 | u_char *cp; |
2107 | struct proc *p; |
2108 | int cc, ce, i, hiwat, error; |
2109 | u_char obuf[OBUFSIZ]; |
2110 | |
2111 | cp = NULL; |
2112 | hiwat = tp->t_hiwat; |
2113 | error = 0; |
2114 | cc = 0; |
2115 | loop: |
2116 | mutex_spin_enter(&tty_lock); |
2117 | if (!CONNECTED(tp)) { |
2118 | if (ISSET(tp->t_state, TS_ISOPEN)) { |
2119 | mutex_spin_exit(&tty_lock); |
2120 | return (EIO); |
2121 | } else if (flag & IO_NDELAY) { |
2122 | mutex_spin_exit(&tty_lock); |
2123 | error = EWOULDBLOCK; |
2124 | goto out; |
2125 | } else { |
2126 | /* Sleep awaiting carrier. */ |
2127 | error = ttysleep(tp, &tp->t_rawcv, true, 0); |
2128 | mutex_spin_exit(&tty_lock); |
2129 | if (error) |
2130 | goto out; |
2131 | goto loop; |
2132 | } |
2133 | } |
2134 | |
2135 | /* |
2136 | * Hang the process if it's in the background. |
2137 | */ |
2138 | p = curproc; |
2139 | if (isbackground(p, tp) && |
2140 | ISSET(tp->t_lflag, TOSTOP) && (p->p_lflag & PL_PPWAIT) == 0 && |
2141 | !sigismasked(curlwp, SIGTTOU)) { |
2142 | if (p->p_pgrp->pg_jobc == 0) { |
2143 | error = EIO; |
2144 | mutex_spin_exit(&tty_lock); |
2145 | goto out; |
2146 | } |
2147 | mutex_spin_exit(&tty_lock); |
2148 | |
2149 | mutex_enter(proc_lock); |
2150 | pgsignal(p->p_pgrp, SIGTTOU, 1); |
2151 | mutex_exit(proc_lock); |
2152 | |
2153 | mutex_spin_enter(&tty_lock); |
2154 | error = ttypause(tp, hz); |
2155 | mutex_spin_exit(&tty_lock); |
2156 | if (error) |
2157 | goto out; |
2158 | goto loop; |
2159 | } |
2160 | mutex_spin_exit(&tty_lock); |
2161 | |
2162 | /* |
2163 | * Process the user's data in at most OBUFSIZ chunks. Perform any |
2164 | * output translation. Keep track of high water mark, sleep on |
2165 | * overflow awaiting device aid in acquiring new space. |
2166 | */ |
2167 | while (uio->uio_resid > 0 || cc > 0) { |
2168 | if (ISSET(tp->t_lflag, FLUSHO)) { |
2169 | uio->uio_resid = 0; |
2170 | return (0); |
2171 | } |
2172 | if (tp->t_outq.c_cc > hiwat) |
2173 | goto ovhiwat; |
2174 | /* |
2175 | * Grab a hunk of data from the user, unless we have some |
2176 | * leftover from last time. |
2177 | */ |
2178 | if (cc == 0) { |
2179 | cc = min(uio->uio_resid, OBUFSIZ); |
2180 | cp = obuf; |
2181 | error = uiomove(cp, cc, uio); |
2182 | if (error) { |
2183 | cc = 0; |
2184 | goto out; |
2185 | } |
2186 | } |
2187 | /* |
2188 | * If nothing fancy need be done, grab those characters we |
2189 | * can handle without any of ttyoutput's processing and |
2190 | * just transfer them to the output q. For those chars |
2191 | * which require special processing (as indicated by the |
2192 | * bits in char_type), call ttyoutput. After processing |
2193 | * a hunk of data, look for FLUSHO so ^O's will take effect |
2194 | * immediately. |
2195 | */ |
2196 | mutex_spin_enter(&tty_lock); |
2197 | while (cc > 0) { |
2198 | if (!ISSET(tp->t_oflag, OPOST)) |
2199 | ce = cc; |
2200 | else { |
2201 | ce = cc - scanc((u_int)cc, cp, char_type, |
2202 | CCLASSMASK); |
2203 | /* |
2204 | * If ce is zero, then we're processing |
2205 | * a special character through ttyoutput. |
2206 | */ |
2207 | if (ce == 0) { |
2208 | tp->t_rocount = 0; |
2209 | if (ttyoutput(*cp, tp) >= 0) { |
2210 | /* out of space */ |
2211 | mutex_spin_exit(&tty_lock); |
2212 | goto overfull; |
2213 | } |
2214 | cp++; |
2215 | cc--; |
2216 | if (ISSET(tp->t_lflag, FLUSHO) || |
2217 | tp->t_outq.c_cc > hiwat) { |
2218 | mutex_spin_exit(&tty_lock); |
2219 | goto ovhiwat; |
2220 | } |
2221 | continue; |
2222 | } |
2223 | } |
2224 | /* |
2225 | * A bunch of normal characters have been found. |
2226 | * Transfer them en masse to the output queue and |
2227 | * continue processing at the top of the loop. |
2228 | * If there are any further characters in this |
2229 | * <= OBUFSIZ chunk, the first should be a character |
2230 | * requiring special handling by ttyoutput. |
2231 | */ |
2232 | tp->t_rocount = 0; |
2233 | i = b_to_q(cp, ce, &tp->t_outq); |
2234 | ce -= i; |
2235 | tp->t_column += ce; |
2236 | cp += ce, cc -= ce, tk_nout += ce; |
2237 | tp->t_outcc += ce; |
2238 | if (i > 0) { |
2239 | /* out of space */ |
2240 | mutex_spin_exit(&tty_lock); |
2241 | goto overfull; |
2242 | } |
2243 | if (ISSET(tp->t_lflag, FLUSHO) || |
2244 | tp->t_outq.c_cc > hiwat) |
2245 | break; |
2246 | } |
2247 | ttstart(tp); |
2248 | mutex_spin_exit(&tty_lock); |
2249 | } |
2250 | |
2251 | out: |
2252 | /* |
2253 | * If cc is nonzero, we leave the uio structure inconsistent, as the |
2254 | * offset and iov pointers have moved forward, but it doesn't matter |
2255 | * (the call will either return short or restart with a new uio). |
2256 | */ |
2257 | uio->uio_resid += cc; |
2258 | return (error); |
2259 | |
2260 | overfull: |
2261 | /* |
2262 | * Since we are using ring buffers, if we can't insert any more into |
2263 | * the output queue, we can assume the ring is full and that someone |
2264 | * forgot to set the high water mark correctly. We set it and then |
2265 | * proceed as normal. |
2266 | */ |
2267 | hiwat = tp->t_outq.c_cc - 1; |
2268 | |
2269 | ovhiwat: |
2270 | mutex_spin_enter(&tty_lock); |
2271 | ttstart(tp); |
2272 | /* |
2273 | * This can only occur if FLUSHO is set in t_lflag, |
2274 | * or if ttstart/oproc is synchronous (or very fast). |
2275 | */ |
2276 | if (tp->t_outq.c_cc <= hiwat) { |
2277 | mutex_spin_exit(&tty_lock); |
2278 | goto loop; |
2279 | } |
2280 | if (flag & IO_NDELAY) { |
2281 | mutex_spin_exit(&tty_lock); |
2282 | error = EWOULDBLOCK; |
2283 | goto out; |
2284 | } |
2285 | error = ttysleep(tp, &tp->t_outcv, true, 0); |
2286 | mutex_spin_exit(&tty_lock); |
2287 | if (error) |
2288 | goto out; |
2289 | goto loop; |
2290 | } |
2291 | |
2292 | /* |
2293 | * Try to pull more output from the producer. Return non-zero if |
2294 | * there is output ready to be sent. |
2295 | */ |
2296 | bool |
2297 | ttypull(struct tty *tp) |
2298 | { |
2299 | |
2300 | /* XXXSMP not yet KASSERT(mutex_owned(&tty_lock)); */ |
2301 | |
2302 | if (tp->t_outq.c_cc <= tp->t_lowat) { |
2303 | cv_broadcast(&tp->t_outcv); |
2304 | selnotify(&tp->t_wsel, 0, NOTE_SUBMIT); |
2305 | } |
2306 | return tp->t_outq.c_cc != 0; |
2307 | } |
2308 | |
2309 | /* |
2310 | * Rubout one character from the rawq of tp |
2311 | * as cleanly as possible. |
2312 | * Called with tty lock held. |
2313 | */ |
2314 | void |
2315 | ttyrub(int c, struct tty *tp) |
2316 | { |
2317 | u_char *cp; |
2318 | int savecol, tabc; |
2319 | |
2320 | KASSERT(mutex_owned(&tty_lock)); |
2321 | |
2322 | if (!ISSET(tp->t_lflag, ECHO) || ISSET(tp->t_lflag, EXTPROC)) |
2323 | return; |
2324 | CLR(tp->t_lflag, FLUSHO); |
2325 | if (ISSET(tp->t_lflag, ECHOE)) { |
2326 | if (tp->t_rocount == 0) { |
2327 | /* |
2328 | * Screwed by ttwrite; retype |
2329 | */ |
2330 | ttyretype(tp); |
2331 | return; |
2332 | } |
2333 | if (c == ('\t' | TTY_QUOTE) || c == ('\n' | TTY_QUOTE)) |
2334 | ttyrubo(tp, 2); |
2335 | else { |
2336 | CLR(c, ~TTY_CHARMASK); |
2337 | switch (CCLASS(c)) { |
2338 | case ORDINARY: |
2339 | ttyrubo(tp, 1); |
2340 | break; |
2341 | case BACKSPACE: |
2342 | case CONTROL: |
2343 | case NEWLINE: |
2344 | case RETURN: |
2345 | case VTAB: |
2346 | if (ISSET(tp->t_lflag, ECHOCTL)) |
2347 | ttyrubo(tp, 2); |
2348 | break; |
2349 | case TAB: |
2350 | if (tp->t_rocount < tp->t_rawq.c_cc) { |
2351 | ttyretype(tp); |
2352 | return; |
2353 | } |
2354 | savecol = tp->t_column; |
2355 | SET(tp->t_state, TS_CNTTB); |
2356 | SET(tp->t_lflag, FLUSHO); |
2357 | tp->t_column = tp->t_rocol; |
2358 | for (cp = firstc(&tp->t_rawq, &tabc); cp; |
2359 | cp = nextc(&tp->t_rawq, cp, &tabc)) |
2360 | ttyecho(tabc, tp); |
2361 | CLR(tp->t_lflag, FLUSHO); |
2362 | CLR(tp->t_state, TS_CNTTB); |
2363 | |
2364 | /* savecol will now be length of the tab. */ |
2365 | savecol -= tp->t_column; |
2366 | tp->t_column += savecol; |
2367 | if (savecol > 8) |
2368 | savecol = 8; /* overflow screw */ |
2369 | while (--savecol >= 0) |
2370 | (void)ttyoutput('\b', tp); |
2371 | break; |
2372 | default: /* XXX */ |
2373 | (void)printf("ttyrub: would panic c = %d, " |
2374 | "val = %d\n" , c, CCLASS(c)); |
2375 | } |
2376 | } |
2377 | } else if (ISSET(tp->t_lflag, ECHOPRT)) { |
2378 | if (!ISSET(tp->t_state, TS_ERASE)) { |
2379 | SET(tp->t_state, TS_ERASE); |
2380 | (void)ttyoutput('\\', tp); |
2381 | } |
2382 | ttyecho(c, tp); |
2383 | } else |
2384 | ttyecho(tp->t_cc[VERASE], tp); |
2385 | --tp->t_rocount; |
2386 | } |
2387 | |
2388 | /* |
2389 | * Back over cnt characters, erasing them. |
2390 | * Called with tty lock held. |
2391 | */ |
2392 | static void |
2393 | ttyrubo(struct tty *tp, int cnt) |
2394 | { |
2395 | |
2396 | KASSERT(mutex_owned(&tty_lock)); |
2397 | |
2398 | while (cnt-- > 0) { |
2399 | (void)ttyoutput('\b', tp); |
2400 | (void)ttyoutput(' ', tp); |
2401 | (void)ttyoutput('\b', tp); |
2402 | } |
2403 | } |
2404 | |
2405 | /* |
2406 | * ttyretype -- |
2407 | * Reprint the rawq line. Note, it is assumed that c_cc has already |
2408 | * been checked. |
2409 | * |
2410 | * Called with tty lock held. |
2411 | */ |
2412 | void |
2413 | ttyretype(struct tty *tp) |
2414 | { |
2415 | u_char *cp; |
2416 | int c; |
2417 | |
2418 | KASSERT(mutex_owned(&tty_lock)); |
2419 | |
2420 | /* Echo the reprint character. */ |
2421 | if (tp->t_cc[VREPRINT] != _POSIX_VDISABLE) |
2422 | ttyecho(tp->t_cc[VREPRINT], tp); |
2423 | |
2424 | (void)ttyoutput('\n', tp); |
2425 | |
2426 | for (cp = firstc(&tp->t_canq, &c); cp; cp = nextc(&tp->t_canq, cp, &c)) |
2427 | ttyecho(c, tp); |
2428 | for (cp = firstc(&tp->t_rawq, &c); cp; cp = nextc(&tp->t_rawq, cp, &c)) |
2429 | ttyecho(c, tp); |
2430 | CLR(tp->t_state, TS_ERASE); |
2431 | |
2432 | tp->t_rocount = tp->t_rawq.c_cc; |
2433 | tp->t_rocol = 0; |
2434 | } |
2435 | |
2436 | /* |
2437 | * Echo a typed character to the terminal. |
2438 | * Called with tty lock held. |
2439 | */ |
2440 | static void |
2441 | ttyecho(int c, struct tty *tp) |
2442 | { |
2443 | |
2444 | KASSERT(mutex_owned(&tty_lock)); |
2445 | |
2446 | if (!ISSET(tp->t_state, TS_CNTTB)) |
2447 | CLR(tp->t_lflag, FLUSHO); |
2448 | if ((!ISSET(tp->t_lflag, ECHO) && |
2449 | (!ISSET(tp->t_lflag, ECHONL) || c != '\n')) || |
2450 | ISSET(tp->t_lflag, EXTPROC)) |
2451 | return; |
2452 | if (((ISSET(tp->t_lflag, ECHOCTL) && |
2453 | (ISSET(c, TTY_CHARMASK) <= 037 && c != '\t' && c != '\n')) || |
2454 | ISSET(c, TTY_CHARMASK) == 0177)) { |
2455 | (void)ttyoutput('^', tp); |
2456 | CLR(c, ~TTY_CHARMASK); |
2457 | if (c == 0177) |
2458 | c = '?'; |
2459 | else |
2460 | c += 'A' - 1; |
2461 | } |
2462 | (void)ttyoutput(c, tp); |
2463 | } |
2464 | |
2465 | /* |
2466 | * Wake up any readers on a tty. |
2467 | * Called with tty lock held. |
2468 | */ |
2469 | void |
2470 | ttwakeup(struct tty *tp) |
2471 | { |
2472 | |
2473 | KASSERT(mutex_owned(&tty_lock)); |
2474 | |
2475 | selnotify(&tp->t_rsel, 0, NOTE_SUBMIT); |
2476 | if (ISSET(tp->t_state, TS_ASYNC)) |
2477 | ttysig(tp, TTYSIG_PG2, SIGIO); |
2478 | cv_broadcast(&tp->t_rawcv); |
2479 | } |
2480 | |
2481 | /* |
2482 | * Look up a code for a specified speed in a conversion table; |
2483 | * used by drivers to map software speed values to hardware parameters. |
2484 | */ |
2485 | int |
2486 | ttspeedtab(int speed, const struct speedtab *table) |
2487 | { |
2488 | |
2489 | for (; table->sp_speed != -1; table++) |
2490 | if (table->sp_speed == speed) |
2491 | return (table->sp_code); |
2492 | return (-1); |
2493 | } |
2494 | |
2495 | /* |
2496 | * Set tty hi and low water marks. |
2497 | * |
2498 | * Try to arrange the dynamics so there's about one second |
2499 | * from hi to low water. |
2500 | */ |
2501 | void |
2502 | ttsetwater(struct tty *tp) |
2503 | { |
2504 | int cps, x; |
2505 | |
2506 | /* XXX not yet KASSERT(mutex_owned(&tty_lock)); */ |
2507 | |
2508 | #define CLAMP(x, h, l) ((x) > h ? h : ((x) < l) ? l : (x)) |
2509 | |
2510 | cps = tp->t_ospeed / 10; |
2511 | tp->t_lowat = x = CLAMP(cps / 2, TTMAXLOWAT, TTMINLOWAT); |
2512 | x += cps; |
2513 | x = CLAMP(x, TTMAXHIWAT, TTMINHIWAT); |
2514 | tp->t_hiwat = roundup(x, TTROUND); |
2515 | #undef CLAMP |
2516 | } |
2517 | |
2518 | /* |
2519 | * Prepare report on state of foreground process group. |
2520 | * Call with proc_lock held. |
2521 | */ |
2522 | void |
2523 | ttygetinfo(struct tty *tp, int fromsig, char *buf, size_t bufsz) |
2524 | { |
2525 | struct lwp *l; |
2526 | struct proc *p, *pick = NULL; |
2527 | struct timeval utime, stime; |
2528 | int tmp; |
2529 | fixpt_t pctcpu = 0; |
2530 | const char *msg; |
2531 | char lmsg[100]; |
2532 | long ; |
2533 | |
2534 | KASSERT(mutex_owned(proc_lock)); |
2535 | |
2536 | *buf = '\0'; |
2537 | |
2538 | if (tp->t_session == NULL) |
2539 | msg = "not a controlling terminal\n" ; |
2540 | else if (tp->t_pgrp == NULL) |
2541 | msg = "no foreground process group\n" ; |
2542 | else if ((p = LIST_FIRST(&tp->t_pgrp->pg_members)) == NULL) |
2543 | msg = "empty foreground process group\n" ; |
2544 | else { |
2545 | /* Pick interesting process. */ |
2546 | for (; p != NULL; p = LIST_NEXT(p, p_pglist)) { |
2547 | struct proc *oldpick; |
2548 | |
2549 | if (pick == NULL) { |
2550 | pick = p; |
2551 | continue; |
2552 | } |
2553 | if (pick->p_lock < p->p_lock) { |
2554 | mutex_enter(pick->p_lock); |
2555 | mutex_enter(p->p_lock); |
2556 | } else if (pick->p_lock > p->p_lock) { |
2557 | mutex_enter(p->p_lock); |
2558 | mutex_enter(pick->p_lock); |
2559 | } else |
2560 | mutex_enter(p->p_lock); |
2561 | oldpick = pick; |
2562 | if (proc_compare_wrapper(pick, p)) |
2563 | pick = p; |
2564 | mutex_exit(p->p_lock); |
2565 | if (p->p_lock != oldpick->p_lock) |
2566 | mutex_exit(oldpick->p_lock); |
2567 | } |
2568 | if (fromsig && |
2569 | (SIGACTION_PS(pick->p_sigacts, SIGINFO).sa_flags & |
2570 | SA_NOKERNINFO)) |
2571 | return; |
2572 | msg = NULL; |
2573 | } |
2574 | |
2575 | /* Print load average. */ |
2576 | tmp = (averunnable.ldavg[0] * 100 + FSCALE / 2) >> FSHIFT; |
2577 | snprintf(lmsg, sizeof(lmsg), "load: %d.%02d " , tmp / 100, tmp % 100); |
2578 | strlcat(buf, lmsg, bufsz); |
2579 | |
2580 | if (pick == NULL) { |
2581 | strlcat(buf, msg, bufsz); |
2582 | return; |
2583 | } |
2584 | |
2585 | snprintf(lmsg, sizeof(lmsg), " cmd: %s %d [" , pick->p_comm, |
2586 | pick->p_pid); |
2587 | strlcat(buf, lmsg, bufsz); |
2588 | |
2589 | mutex_enter(pick->p_lock); |
2590 | LIST_FOREACH(l, &pick->p_lwps, l_sibling) { |
2591 | const char *lp; |
2592 | lwp_lock(l); |
2593 | #ifdef LWP_PC |
2594 | #define FMT_RUN "%#"PRIxVADDR |
2595 | #define VAL_RUNNING (vaddr_t)LWP_PC(l) |
2596 | #define VAL_RUNABLE (vaddr_t)LWP_PC(l) |
2597 | #else |
2598 | #define FMT_RUN "%s" |
2599 | #define VAL_RUNNING "running" |
2600 | #define VAL_RUNABLE "runnable" |
2601 | #endif |
2602 | switch (l->l_stat) { |
2603 | case LSONPROC: |
2604 | snprintf(lmsg, sizeof(lmsg), FMT_RUN"/%d" , VAL_RUNNING, |
2605 | cpu_index(l->l_cpu)); |
2606 | lp = lmsg; |
2607 | break; |
2608 | case LSRUN: |
2609 | snprintf(lmsg, sizeof(lmsg), FMT_RUN, VAL_RUNABLE); |
2610 | lp = lmsg; |
2611 | break; |
2612 | default: |
2613 | lp = l->l_wchan ? l->l_wmesg : "iowait" ; |
2614 | break; |
2615 | } |
2616 | strlcat(buf, lp, bufsz); |
2617 | strlcat(buf, LIST_NEXT(l, l_sibling) != NULL ? " " : "] " , |
2618 | bufsz); |
2619 | pctcpu += l->l_pctcpu; |
2620 | lwp_unlock(l); |
2621 | } |
2622 | pctcpu += pick->p_pctcpu; |
2623 | calcru(pick, &utime, &stime, NULL, NULL); |
2624 | mutex_exit(pick->p_lock); |
2625 | |
2626 | /* Round up and print user+system time, %CPU and RSS. */ |
2627 | utime.tv_usec += 5000; |
2628 | if (utime.tv_usec >= 1000000) { |
2629 | utime.tv_sec += 1; |
2630 | utime.tv_usec -= 1000000; |
2631 | } |
2632 | stime.tv_usec += 5000; |
2633 | if (stime.tv_usec >= 1000000) { |
2634 | stime.tv_sec += 1; |
2635 | stime.tv_usec -= 1000000; |
2636 | } |
2637 | #define pgtok(a) (((u_long) ((a) * PAGE_SIZE) / 1024)) |
2638 | tmp = (pctcpu * 10000 + FSCALE / 2) >> FSHIFT; |
2639 | if (pick->p_stat == SIDL || P_ZOMBIE(pick)) |
2640 | rss = 0; |
2641 | else |
2642 | rss = pgtok(vm_resident_count(pick->p_vmspace)); |
2643 | |
2644 | snprintf(lmsg, sizeof(lmsg), "%ld.%02ldu %ld.%02lds %d%% %ldk" , |
2645 | (long)utime.tv_sec, (long)utime.tv_usec / 10000, |
2646 | (long)stime.tv_sec, (long)stime.tv_usec / 10000, |
2647 | tmp / 100, rss); |
2648 | strlcat(buf, lmsg, bufsz); |
2649 | } |
2650 | |
2651 | /* |
2652 | * Print report on state of foreground process group. |
2653 | * Call with tty_lock held. |
2654 | */ |
2655 | void |
2656 | ttyputinfo(struct tty *tp, char *buf) |
2657 | { |
2658 | |
2659 | KASSERT(mutex_owned(&tty_lock)); |
2660 | |
2661 | if (ttycheckoutq_wlock(tp, 0) == 0) |
2662 | return; |
2663 | ttyprintf_nolock(tp, "%s\n" , buf); |
2664 | tp->t_rocount = 0; /* so pending input will be retyped if BS */ |
2665 | } |
2666 | |
2667 | /* |
2668 | * Returns 1 if p2 has a better chance being the active foreground process |
2669 | * in a terminal instead of p1. |
2670 | */ |
2671 | static int |
2672 | proc_compare_wrapper(struct proc *p1, struct proc *p2) |
2673 | { |
2674 | lwp_t *l1, *l2; |
2675 | |
2676 | KASSERT(mutex_owned(p1->p_lock)); |
2677 | KASSERT(mutex_owned(p2->p_lock)); |
2678 | |
2679 | if ((l1 = LIST_FIRST(&p1->p_lwps)) == NULL) |
2680 | return 1; |
2681 | |
2682 | if ((l2 = LIST_FIRST(&p2->p_lwps)) == NULL) |
2683 | return 0; |
2684 | |
2685 | return proc_compare(p1, l1, p2, l2); |
2686 | } |
2687 | |
2688 | /* |
2689 | * Output char to tty; console putchar style. |
2690 | * Can be called with tty lock held through kprintf() machinery.. |
2691 | */ |
2692 | int |
2693 | tputchar(int c, int flags, struct tty *tp) |
2694 | { |
2695 | int r = 0; |
2696 | |
2697 | if ((flags & NOLOCK) == 0) |
2698 | mutex_spin_enter(&tty_lock); |
2699 | if (!CONNECTED(tp)) { |
2700 | r = -1; |
2701 | goto out; |
2702 | } |
2703 | if (c == '\n') |
2704 | (void)ttyoutput('\r', tp); |
2705 | (void)ttyoutput(c, tp); |
2706 | ttstart(tp); |
2707 | out: |
2708 | if ((flags & NOLOCK) == 0) |
2709 | mutex_spin_exit(&tty_lock); |
2710 | return (r); |
2711 | } |
2712 | |
2713 | /* |
2714 | * Sleep on chan, returning ERESTART if tty changed while we napped and |
2715 | * returning any errors (e.g. EINTR/EWOULDBLOCK) reported by |
2716 | * cv_timedwait(_sig). |
2717 | * If the tty is revoked, restarting a pending call will redo validation done |
2718 | * at the start of the call. |
2719 | * |
2720 | * Must be called with the tty lock held. |
2721 | */ |
2722 | int |
2723 | ttysleep(struct tty *tp, kcondvar_t *cv, bool catch_p, int timo) |
2724 | { |
2725 | int error; |
2726 | short gen; |
2727 | |
2728 | KASSERT(mutex_owned(&tty_lock)); |
2729 | |
2730 | gen = tp->t_gen; |
2731 | if (cv == NULL) |
2732 | error = kpause("ttypause" , catch_p, timo, &tty_lock); |
2733 | else if (catch_p) |
2734 | error = cv_timedwait_sig(cv, &tty_lock, timo); |
2735 | else |
2736 | error = cv_timedwait(cv, &tty_lock, timo); |
2737 | if (error != 0) |
2738 | return (error); |
2739 | return (tp->t_gen == gen ? 0 : ERESTART); |
2740 | } |
2741 | |
2742 | int |
2743 | ttypause(struct tty *tp, int timo) |
2744 | { |
2745 | int error; |
2746 | |
2747 | error = ttysleep(tp, NULL, true, timo); |
2748 | if (error == EWOULDBLOCK) |
2749 | error = 0; |
2750 | return error; |
2751 | } |
2752 | |
2753 | /* |
2754 | * Attach a tty to the tty list. |
2755 | * |
2756 | * This should be called ONLY once per real tty (including pty's). |
2757 | * eg, on the sparc, the keyboard and mouse have struct tty's that are |
2758 | * distinctly NOT usable as tty's, and thus should not be attached to |
2759 | * the ttylist. This is why this call is not done from tty_alloc(). |
2760 | * |
2761 | * Device drivers should attach tty's at a similar time that they are |
2762 | * allocated, or, for the case of statically allocated struct tty's |
2763 | * either in the attach or (first) open routine. |
2764 | */ |
2765 | void |
2766 | tty_attach(struct tty *tp) |
2767 | { |
2768 | |
2769 | mutex_spin_enter(&tty_lock); |
2770 | TAILQ_INSERT_TAIL(&ttylist, tp, tty_link); |
2771 | ++tty_count; |
2772 | mutex_spin_exit(&tty_lock); |
2773 | } |
2774 | |
2775 | /* |
2776 | * Remove a tty from the tty list. |
2777 | */ |
2778 | void |
2779 | tty_detach(struct tty *tp) |
2780 | { |
2781 | |
2782 | mutex_spin_enter(&tty_lock); |
2783 | --tty_count; |
2784 | #ifdef DIAGNOSTIC |
2785 | if (tty_count < 0) |
2786 | panic("tty_detach: tty_count < 0" ); |
2787 | #endif |
2788 | TAILQ_REMOVE(&ttylist, tp, tty_link); |
2789 | mutex_spin_exit(&tty_lock); |
2790 | } |
2791 | |
2792 | /* |
2793 | * Allocate a tty structure and its associated buffers. |
2794 | */ |
2795 | struct tty * |
2796 | tty_alloc(void) |
2797 | { |
2798 | struct tty *tp; |
2799 | int i; |
2800 | |
2801 | tp = kmem_zalloc(sizeof(*tp), KM_SLEEP); |
2802 | callout_init(&tp->t_rstrt_ch, 0); |
2803 | callout_setfunc(&tp->t_rstrt_ch, ttrstrt, tp); |
2804 | tp->t_qsize = tty_qsize; |
2805 | clalloc(&tp->t_rawq, tp->t_qsize, 1); |
2806 | cv_init(&tp->t_rawcv, "ttyraw" ); |
2807 | cv_init(&tp->t_rawcvf, "ttyrawf" ); |
2808 | clalloc(&tp->t_canq, tp->t_qsize, 1); |
2809 | cv_init(&tp->t_cancv, "ttycan" ); |
2810 | cv_init(&tp->t_cancvf, "ttycanf" ); |
2811 | /* output queue doesn't need quoting */ |
2812 | clalloc(&tp->t_outq, tp->t_qsize, 0); |
2813 | cv_init(&tp->t_outcv, "ttyout" ); |
2814 | cv_init(&tp->t_outcvf, "ttyoutf" ); |
2815 | /* Set default line discipline. */ |
2816 | tp->t_linesw = ttyldisc_default(); |
2817 | tp->t_dev = NODEV; |
2818 | selinit(&tp->t_rsel); |
2819 | selinit(&tp->t_wsel); |
2820 | for (i = 0; i < TTYSIG_COUNT; i++) { |
2821 | sigemptyset(&tp->t_sigs[i]); |
2822 | } |
2823 | |
2824 | return tp; |
2825 | } |
2826 | |
2827 | /* |
2828 | * Free a tty structure and its buffers. |
2829 | * |
2830 | * Be sure to call tty_detach() for any tty that has been |
2831 | * tty_attach()ed. |
2832 | */ |
2833 | void |
2834 | tty_free(struct tty *tp) |
2835 | { |
2836 | int i; |
2837 | |
2838 | mutex_enter(proc_lock); |
2839 | mutex_enter(&tty_lock); |
2840 | for (i = 0; i < TTYSIG_COUNT; i++) |
2841 | sigemptyset(&tp->t_sigs[i]); |
2842 | if (tp->t_sigcount != 0) |
2843 | TAILQ_REMOVE(&tty_sigqueue, tp, t_sigqueue); |
2844 | mutex_exit(&tty_lock); |
2845 | mutex_exit(proc_lock); |
2846 | |
2847 | callout_halt(&tp->t_rstrt_ch, NULL); |
2848 | callout_destroy(&tp->t_rstrt_ch); |
2849 | ttyldisc_release(tp->t_linesw); |
2850 | clfree(&tp->t_rawq); |
2851 | clfree(&tp->t_canq); |
2852 | clfree(&tp->t_outq); |
2853 | cv_destroy(&tp->t_rawcv); |
2854 | cv_destroy(&tp->t_rawcvf); |
2855 | cv_destroy(&tp->t_cancv); |
2856 | cv_destroy(&tp->t_cancvf); |
2857 | cv_destroy(&tp->t_outcv); |
2858 | cv_destroy(&tp->t_outcvf); |
2859 | seldestroy(&tp->t_rsel); |
2860 | seldestroy(&tp->t_wsel); |
2861 | kmem_free(tp, sizeof(*tp)); |
2862 | } |
2863 | |
2864 | /* |
2865 | * ttyprintf_nolock: send a message to a specific tty, without locking. |
2866 | * |
2867 | * => should be used only by tty driver or anything that knows the |
2868 | * underlying tty will not be revoked(2)'d away. [otherwise, |
2869 | * use tprintf] |
2870 | */ |
2871 | static void |
2872 | ttyprintf_nolock(struct tty *tp, const char *fmt, ...) |
2873 | { |
2874 | va_list ap; |
2875 | |
2876 | /* No mutex needed; going to process TTY. */ |
2877 | va_start(ap, fmt); |
2878 | kprintf(fmt, TOTTY|NOLOCK, tp, NULL, ap); |
2879 | va_end(ap); |
2880 | } |
2881 | |
2882 | static int |
2883 | tty_listener_cb(kauth_cred_t cred, kauth_action_t action, void *cookie, |
2884 | void *arg0, void *arg1, void *arg2, void *arg3) |
2885 | { |
2886 | struct tty *tty; |
2887 | int result; |
2888 | |
2889 | result = KAUTH_RESULT_DEFER; |
2890 | |
2891 | if (action != KAUTH_DEVICE_TTY_OPEN) |
2892 | return result; |
2893 | |
2894 | tty = arg0; |
2895 | |
2896 | /* If it's not opened, we allow. */ |
2897 | if ((tty->t_state & TS_ISOPEN) == 0) |
2898 | result = KAUTH_RESULT_ALLOW; |
2899 | else { |
2900 | /* |
2901 | * If it's opened, we can only allow if it's not exclusively |
2902 | * opened; otherwise, that's a privileged operation and we |
2903 | * let the secmodel handle it. |
2904 | */ |
2905 | if ((tty->t_state & TS_XCLUDE) == 0) |
2906 | result = KAUTH_RESULT_ALLOW; |
2907 | } |
2908 | |
2909 | return result; |
2910 | } |
2911 | |
2912 | /* |
2913 | * Initialize the tty subsystem. |
2914 | */ |
2915 | void |
2916 | tty_init(void) |
2917 | { |
2918 | |
2919 | mutex_init(&tty_lock, MUTEX_DEFAULT, IPL_VM); |
2920 | rw_init(&ttcompat_lock); |
2921 | tty_sigsih = softint_establish(SOFTINT_CLOCK, ttysigintr, NULL); |
2922 | KASSERT(tty_sigsih != NULL); |
2923 | |
2924 | tty_listener = kauth_listen_scope(KAUTH_SCOPE_DEVICE, |
2925 | tty_listener_cb, NULL); |
2926 | |
2927 | sysctl_kern_tty_setup(); |
2928 | } |
2929 | |
2930 | /* |
2931 | * Send a signal from a tty to its process group or session leader. |
2932 | * Handoff to the target is deferred to a soft interrupt. |
2933 | */ |
2934 | void |
2935 | ttysig(struct tty *tp, enum ttysigtype st, int sig) |
2936 | { |
2937 | sigset_t *sp; |
2938 | |
2939 | /* XXXSMP not yet KASSERT(mutex_owned(&tty_lock)); */ |
2940 | |
2941 | sp = &tp->t_sigs[st]; |
2942 | if (sigismember(sp, sig)) |
2943 | return; |
2944 | sigaddset(sp, sig); |
2945 | if (tp->t_sigcount++ == 0) |
2946 | TAILQ_INSERT_TAIL(&tty_sigqueue, tp, t_sigqueue); |
2947 | softint_schedule(tty_sigsih); |
2948 | } |
2949 | |
2950 | /* |
2951 | * Deliver deferred signals from ttys. Note that the process groups |
2952 | * and sessions associated with the ttys may have changed from when |
2953 | * the signal was originally sent, but in practice it should not matter. |
2954 | * For signals produced as a result of a syscall, the soft interrupt |
2955 | * will fire before the syscall returns to the user. |
2956 | */ |
2957 | static void |
2958 | ttysigintr(void *cookie) |
2959 | { |
2960 | struct tty *tp; |
2961 | enum ttysigtype st; |
2962 | struct pgrp *pgrp; |
2963 | struct session *sess; |
2964 | int sig, lflag; |
2965 | char infobuf[200]; |
2966 | |
2967 | mutex_enter(proc_lock); |
2968 | mutex_spin_enter(&tty_lock); |
2969 | while ((tp = TAILQ_FIRST(&tty_sigqueue)) != NULL) { |
2970 | KASSERT(tp->t_sigcount > 0); |
2971 | for (st = TTYSIG_PG1; st < TTYSIG_COUNT; st++) { |
2972 | if ((sig = firstsig(&tp->t_sigs[st])) != 0) |
2973 | break; |
2974 | } |
2975 | KASSERT(st < TTYSIG_COUNT); |
2976 | sigdelset(&tp->t_sigs[st], sig); |
2977 | if (--tp->t_sigcount == 0) |
2978 | TAILQ_REMOVE(&tty_sigqueue, tp, t_sigqueue); |
2979 | pgrp = tp->t_pgrp; |
2980 | sess = tp->t_session; |
2981 | lflag = tp->t_lflag; |
2982 | if (sig == SIGINFO) { |
2983 | if (ISSET(tp->t_state, TS_SIGINFO)) { |
2984 | /* Via ioctl: ignore tty option. */ |
2985 | tp->t_state &= ~TS_SIGINFO; |
2986 | lflag |= ISIG; |
2987 | } |
2988 | if (!ISSET(lflag, NOKERNINFO)) { |
2989 | mutex_spin_exit(&tty_lock); |
2990 | ttygetinfo(tp, 1, infobuf, sizeof(infobuf)); |
2991 | mutex_spin_enter(&tty_lock); |
2992 | ttyputinfo(tp, infobuf); |
2993 | } |
2994 | if (!ISSET(lflag, ISIG)) |
2995 | continue; |
2996 | } |
2997 | mutex_spin_exit(&tty_lock); |
2998 | KASSERT(sig != 0); |
2999 | switch (st) { |
3000 | case TTYSIG_PG1: |
3001 | if (pgrp != NULL) |
3002 | pgsignal(pgrp, sig, 1); |
3003 | break; |
3004 | case TTYSIG_PG2: |
3005 | if (pgrp != NULL) |
3006 | pgsignal(pgrp, sig, sess != NULL); |
3007 | break; |
3008 | case TTYSIG_LEADER: |
3009 | if (sess != NULL && sess->s_leader != NULL) |
3010 | psignal(sess->s_leader, sig); |
3011 | break; |
3012 | default: |
3013 | /* NOTREACHED */ |
3014 | break; |
3015 | } |
3016 | mutex_spin_enter(&tty_lock); |
3017 | } |
3018 | mutex_spin_exit(&tty_lock); |
3019 | mutex_exit(proc_lock); |
3020 | } |
3021 | |
3022 | unsigned char |
3023 | tty_getctrlchar(struct tty *tp, unsigned which) |
3024 | { |
3025 | KASSERT(which < NCCS); |
3026 | return tp->t_cc[which]; |
3027 | } |
3028 | |
3029 | void |
3030 | tty_setctrlchar(struct tty *tp, unsigned which, unsigned char val) |
3031 | { |
3032 | KASSERT(which < NCCS); |
3033 | tp->t_cc[which] = val; |
3034 | } |
3035 | |
3036 | int |
3037 | tty_try_xonxoff(struct tty *tp, unsigned char c) |
3038 | { |
3039 | const struct cdevsw *cdev; |
3040 | |
3041 | if (tp->t_iflag & IXON) { |
3042 | if (c == tp->t_cc[VSTOP] && tp->t_cc[VSTOP] != _POSIX_VDISABLE) { |
3043 | if ((tp->t_state & TS_TTSTOP) == 0) { |
3044 | tp->t_state |= TS_TTSTOP; |
3045 | cdev = cdevsw_lookup(tp->t_dev); |
3046 | if (cdev != NULL) |
3047 | (*cdev->d_stop)(tp, 0); |
3048 | } |
3049 | return 0; |
3050 | } |
3051 | if (c == tp->t_cc[VSTART] && tp->t_cc[VSTART] != _POSIX_VDISABLE) { |
3052 | tp->t_state &= ~TS_TTSTOP; |
3053 | if (tp->t_oproc != NULL) { |
3054 | mutex_spin_enter(&tty_lock); /* XXX */ |
3055 | (*tp->t_oproc)(tp); |
3056 | mutex_spin_exit(&tty_lock); /* XXX */ |
3057 | } |
3058 | return 0; |
3059 | } |
3060 | } |
3061 | return EAGAIN; |
3062 | } |
3063 | |