tty.c revision 137779
1/*- 2 * Copyright (c) 1982, 1986, 1990, 1991, 1993 3 * The Regents of the University of California. All rights reserved. 4 * (c) UNIX System Laboratories, Inc. 5 * All or some portions of this file are derived from material licensed 6 * to the University of California by American Telephone and Telegraph 7 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 8 * the permission of UNIX System Laboratories, Inc. 9 * 10 * Copyright (c) 2002 Networks Associates Technologies, Inc. 11 * All rights reserved. 12 * 13 * Portions of this software were developed for the FreeBSD Project by 14 * ThinkSec AS and NAI Labs, the Security Research Division of Network 15 * Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 16 * ("CBOSS"), as part of the DARPA CHATS research program. 17 * 18 * Redistribution and use in source and binary forms, with or without 19 * modification, are permitted provided that the following conditions 20 * are met: 21 * 1. Redistributions of source code must retain the above copyright 22 * notice, this list of conditions and the following disclaimer. 23 * 2. Redistributions in binary form must reproduce the above copyright 24 * notice, this list of conditions and the following disclaimer in the 25 * documentation and/or other materials provided with the distribution. 26 * 4. Neither the name of the University nor the names of its contributors 27 * may be used to endorse or promote products derived from this software 28 * without specific prior written permission. 29 * 30 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 31 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 32 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 33 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 34 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 35 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 36 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 37 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 38 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 39 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 40 * SUCH DAMAGE. 41 * 42 * @(#)tty.c 8.8 (Berkeley) 1/21/94 43 */ 44 45/*- 46 * TODO: 47 * o Fix races for sending the start char in ttyflush(). 48 * o Handle inter-byte timeout for "MIN > 0, TIME > 0" in ttyselect(). 49 * With luck, there will be MIN chars before select() returns(). 50 * o Handle CLOCAL consistently for ptys. Perhaps disallow setting it. 51 * o Don't allow input in TS_ZOMBIE case. It would be visible through 52 * FIONREAD. 53 * o Do the new sio locking stuff here and use it to avoid special 54 * case for EXTPROC? 55 * o Lock PENDIN too? 56 * o Move EXTPROC and/or PENDIN to t_state? 57 * o Wrap most of ttioctl in spltty/splx. 58 * o Implement TIOCNOTTY or remove it from <sys/ioctl.h>. 59 * o Send STOP if IXOFF is toggled off while TS_TBLOCK is set. 60 * o Don't allow certain termios flags to affect disciplines other 61 * than TTYDISC. Cancel their effects before switch disciplines 62 * and ignore them if they are set while we are in another 63 * discipline. 64 * o Now that historical speed conversions are handled here, don't 65 * do them in drivers. 66 * o Check for TS_CARR_ON being set while everything is closed and not 67 * waiting for carrier. TS_CARR_ON isn't cleared if nothing is open, 68 * so it would live until the next open even if carrier drops. 69 * o Restore TS_WOPEN since it is useful in pstat. It must be cleared 70 * only when _all_ openers leave open(). 71 */ 72 73#include <sys/cdefs.h> 74__FBSDID("$FreeBSD: head/sys/kern/tty.c 137779 2004-11-16 17:41:16Z dds $"); 75 76#include "opt_compat.h" 77#include "opt_tty.h" 78 79#include <sys/param.h> 80#include <sys/systm.h> 81#include <sys/filio.h> 82#include <sys/lock.h> 83#include <sys/mutex.h> 84#include <sys/namei.h> 85#include <sys/sx.h> 86#ifndef BURN_BRIDGES 87#if defined(COMPAT_43) 88#include <sys/ioctl_compat.h> 89#endif 90#endif 91#include <sys/proc.h> 92#define TTYDEFCHARS 93#include <sys/tty.h> 94#undef TTYDEFCHARS 95#include <sys/fcntl.h> 96#include <sys/conf.h> 97#include <sys/poll.h> 98#include <sys/kernel.h> 99#include <sys/vnode.h> 100#include <sys/serial.h> 101#include <sys/signalvar.h> 102#include <sys/resourcevar.h> 103#include <sys/malloc.h> 104#include <sys/filedesc.h> 105#include <sys/sched.h> 106#include <sys/sysctl.h> 107#include <sys/timepps.h> 108 109#include <machine/stdarg.h> 110 111#include <vm/vm.h> 112#include <vm/pmap.h> 113#include <vm/vm_map.h> 114 115MALLOC_DEFINE(M_TTYS, "ttys", "tty data structures"); 116 117long tk_cancc; 118long tk_nin; 119long tk_nout; 120long tk_rawcc; 121 122static d_open_t ttysopen; 123static d_close_t ttysclose; 124static d_read_t ttysrdwr; 125static d_ioctl_t ttysioctl; 126static d_purge_t ttypurge; 127 128/* Default cdevsw for common tty devices */ 129static struct cdevsw tty_cdevsw = { 130 .d_version = D_VERSION, 131 .d_open = ttyopen, 132 .d_close = ttyclose, 133 .d_ioctl = ttyioctl, 134 .d_purge = ttypurge, 135 .d_name = "ttydrv", 136 .d_flags = D_TTY | D_NEEDGIANT, 137}; 138 139/* Cdevsw for slave tty devices */ 140static struct cdevsw ttys_cdevsw = { 141 .d_version = D_VERSION, 142 .d_open = ttysopen, 143 .d_close = ttysclose, 144 .d_read = ttysrdwr, 145 .d_write = ttysrdwr, 146 .d_ioctl = ttysioctl, 147 .d_name = "TTYS", 148 .d_flags = D_TTY | D_NEEDGIANT, 149}; 150 151static int proc_compare(struct proc *p1, struct proc *p2); 152static int ttnread(struct tty *tp); 153static void ttyecho(int c, struct tty *tp); 154static int ttyoutput(int c, struct tty *tp); 155static void ttypend(struct tty *tp); 156static void ttyretype(struct tty *tp); 157static void ttyrub(int c, struct tty *tp); 158static void ttyrubo(struct tty *tp, int cnt); 159static void ttyunblock(struct tty *tp); 160static int ttywflush(struct tty *tp); 161static int filt_ttyread(struct knote *kn, long hint); 162static void filt_ttyrdetach(struct knote *kn); 163static int filt_ttywrite(struct knote *kn, long hint); 164static void filt_ttywdetach(struct knote *kn); 165 166/* 167 * Table with character classes and parity. The 8th bit indicates parity, 168 * the 7th bit indicates the character is an alphameric or underscore (for 169 * ALTWERASE), and the low 6 bits indicate delay type. If the low 6 bits 170 * are 0 then the character needs no special processing on output; classes 171 * other than 0 might be translated or (not currently) require delays. 172 */ 173#define E 0x00 /* Even parity. */ 174#define O 0x80 /* Odd parity. */ 175#define PARITY(c) (char_type[c] & O) 176 177#define ALPHA 0x40 /* Alpha or underscore. */ 178#define ISALPHA(c) (char_type[(c) & TTY_CHARMASK] & ALPHA) 179 180#define CCLASSMASK 0x3f 181#define CCLASS(c) (char_type[c] & CCLASSMASK) 182 183#define BS BACKSPACE 184#define CC CONTROL 185#define CR RETURN 186#define NA ORDINARY | ALPHA 187#define NL NEWLINE 188#define NO ORDINARY 189#define TB TAB 190#define VT VTAB 191 192static u_char const char_type[] = { 193 E|CC, O|CC, O|CC, E|CC, O|CC, E|CC, E|CC, O|CC, /* nul - bel */ 194 O|BS, E|TB, E|NL, O|CC, E|VT, O|CR, O|CC, E|CC, /* bs - si */ 195 O|CC, E|CC, E|CC, O|CC, E|CC, O|CC, O|CC, E|CC, /* dle - etb */ 196 E|CC, O|CC, O|CC, E|CC, O|CC, E|CC, E|CC, O|CC, /* can - us */ 197 O|NO, E|NO, E|NO, O|NO, E|NO, O|NO, O|NO, E|NO, /* sp - ' */ 198 E|NO, O|NO, O|NO, E|NO, O|NO, E|NO, E|NO, O|NO, /* ( - / */ 199 E|NA, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* 0 - 7 */ 200 O|NA, E|NA, E|NO, O|NO, E|NO, O|NO, O|NO, E|NO, /* 8 - ? */ 201 O|NO, E|NA, E|NA, O|NA, E|NA, O|NA, O|NA, E|NA, /* @ - G */ 202 E|NA, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* H - O */ 203 E|NA, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* P - W */ 204 O|NA, E|NA, E|NA, O|NO, E|NO, O|NO, O|NO, O|NA, /* X - _ */ 205 E|NO, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* ` - g */ 206 O|NA, E|NA, E|NA, O|NA, E|NA, O|NA, O|NA, E|NA, /* h - o */ 207 O|NA, E|NA, E|NA, O|NA, E|NA, O|NA, O|NA, E|NA, /* p - w */ 208 E|NA, O|NA, O|NA, E|NO, O|NO, E|NO, E|NO, O|CC, /* x - del */ 209 /* 210 * Meta chars; should be settable per character set; 211 * for now, treat them all as normal characters. 212 */ 213 NA, NA, NA, NA, NA, NA, NA, NA, 214 NA, NA, NA, NA, NA, NA, NA, NA, 215 NA, NA, NA, NA, NA, NA, NA, NA, 216 NA, NA, NA, NA, NA, NA, NA, NA, 217 NA, NA, NA, NA, NA, NA, NA, NA, 218 NA, NA, NA, NA, NA, NA, NA, NA, 219 NA, NA, NA, NA, NA, NA, NA, NA, 220 NA, NA, NA, NA, NA, NA, NA, NA, 221 NA, NA, NA, NA, NA, NA, NA, NA, 222 NA, NA, NA, NA, NA, NA, NA, NA, 223 NA, NA, NA, NA, NA, NA, NA, NA, 224 NA, NA, NA, NA, NA, NA, NA, NA, 225 NA, NA, NA, NA, NA, NA, NA, NA, 226 NA, NA, NA, NA, NA, NA, NA, NA, 227 NA, NA, NA, NA, NA, NA, NA, NA, 228 NA, NA, NA, NA, NA, NA, NA, NA, 229}; 230#undef BS 231#undef CC 232#undef CR 233#undef NA 234#undef NL 235#undef NO 236#undef TB 237#undef VT 238 239/* Macros to clear/set/test flags. */ 240#define SET(t, f) (t) |= (f) 241#define CLR(t, f) (t) &= ~(f) 242#define ISSET(t, f) ((t) & (f)) 243 244#undef MAX_INPUT /* XXX wrong in <sys/syslimits.h> */ 245#define MAX_INPUT TTYHOG /* XXX limit is usually larger for !ICANON */ 246 247/* 248 * list of struct tty where pstat(8) can pick it up with sysctl 249 * 250 * The lock order is to grab the list mutex before the tty mutex. 251 * Together with additions going on the tail of the list, this allows 252 * the sysctl to avoid doing retries. 253 */ 254static TAILQ_HEAD(, tty) tty_list = TAILQ_HEAD_INITIALIZER(tty_list); 255static struct mtx tty_list_mutex; 256 257static struct unrhdr *tty_unit; 258 259static int drainwait = 5*60; 260SYSCTL_INT(_kern, OID_AUTO, drainwait, CTLFLAG_RW, &drainwait, 261 0, "Output drain timeout in seconds"); 262 263static struct tty * 264tty_gettp(struct cdev *dev) 265{ 266 struct tty *tp; 267 struct cdevsw *csw; 268 269 csw = dev_refthread(dev); 270 KASSERT(csw != NULL, ("No cdevsw in ttycode (%s)", devtoname(dev))); 271 KASSERT(csw->d_flags & D_TTY, 272 ("non D_TTY (%s) in tty code", devtoname(dev))); 273 dev_relthread(dev); 274 tp = dev->si_tty; 275 KASSERT(tp != NULL, 276 ("no tty pointer on (%s) in tty code", devtoname(dev))); 277 return (tp); 278} 279 280/* 281 * Initial open of tty, or (re)entry to standard tty line discipline. 282 */ 283int 284tty_open(struct cdev *device, struct tty *tp) 285{ 286 int s; 287 288 s = spltty(); 289 tp->t_dev = device; 290 tp->t_hotchar = 0; 291 if (!ISSET(tp->t_state, TS_ISOPEN)) { 292 ttyref(tp); 293 SET(tp->t_state, TS_ISOPEN); 294 if (ISSET(tp->t_cflag, CLOCAL)) 295 SET(tp->t_state, TS_CONNECTED); 296 bzero(&tp->t_winsize, sizeof(tp->t_winsize)); 297 } 298 /* XXX don't hang forever on output */ 299 if (tp->t_timeout < 0) 300 tp->t_timeout = drainwait*hz; 301 ttsetwater(tp); 302 splx(s); 303 return (0); 304} 305 306/* 307 * Handle close() on a tty line: flush and set to initial state, 308 * bumping generation number so that pending read/write calls 309 * can detect recycling of the tty. 310 * XXX our caller should have done `spltty(); l_close(); tty_close();' 311 * and l_close() should have flushed, but we repeat the spltty() and 312 * the flush in case there are buggy callers. 313 */ 314int 315tty_close(struct tty *tp) 316{ 317 int s; 318 319 funsetown(&tp->t_sigio); 320 s = spltty(); 321 if (constty == tp) 322 constty_clear(); 323 324 ttyflush(tp, FREAD | FWRITE); 325 clist_free_cblocks(&tp->t_canq); 326 clist_free_cblocks(&tp->t_outq); 327 clist_free_cblocks(&tp->t_rawq); 328 329 tp->t_gen++; 330 tp->t_line = TTYDISC; 331 tp->t_hotchar = 0; 332 tp->t_pgrp = NULL; 333 tp->t_session = NULL; 334 tp->t_state = 0; 335 knlist_clear(&tp->t_rsel.si_note, 0); 336 knlist_clear(&tp->t_wsel.si_note, 0); 337 ttyrel(tp); 338 splx(s); 339 return (0); 340} 341 342#define FLUSHQ(q) { \ 343 if ((q)->c_cc) \ 344 ndflush(q, (q)->c_cc); \ 345} 346 347/* Is 'c' a line delimiter ("break" character)? */ 348#define TTBREAKC(c, lflag) \ 349 ((c) == '\n' || (((c) == cc[VEOF] || \ 350 (c) == cc[VEOL] || ((c) == cc[VEOL2] && lflag & IEXTEN)) && \ 351 (c) != _POSIX_VDISABLE)) 352 353/* 354 * Process input of a single character received on a tty. 355 */ 356int 357ttyinput(int c, struct tty *tp) 358{ 359 tcflag_t iflag, lflag; 360 cc_t *cc; 361 int i, err; 362 363 /* 364 * If input is pending take it first. 365 */ 366 lflag = tp->t_lflag; 367 if (ISSET(lflag, PENDIN)) 368 ttypend(tp); 369 /* 370 * Gather stats. 371 */ 372 if (ISSET(lflag, ICANON)) { 373 ++tk_cancc; 374 ++tp->t_cancc; 375 } else { 376 ++tk_rawcc; 377 ++tp->t_rawcc; 378 } 379 ++tk_nin; 380 381 /* 382 * Block further input iff: 383 * current input > threshold AND input is available to user program 384 * AND input flow control is enabled and not yet invoked. 385 * The 3 is slop for PARMRK. 386 */ 387 iflag = tp->t_iflag; 388 if (tp->t_rawq.c_cc + tp->t_canq.c_cc > tp->t_ihiwat - 3 && 389 (!ISSET(lflag, ICANON) || tp->t_canq.c_cc != 0) && 390 (ISSET(tp->t_cflag, CRTS_IFLOW) || ISSET(iflag, IXOFF)) && 391 !ISSET(tp->t_state, TS_TBLOCK)) 392 ttyblock(tp); 393 394 /* Handle exceptional conditions (break, parity, framing). */ 395 cc = tp->t_cc; 396 err = (ISSET(c, TTY_ERRORMASK)); 397 if (err) { 398 CLR(c, TTY_ERRORMASK); 399 if (ISSET(err, TTY_BI)) { 400 if (ISSET(iflag, IGNBRK)) 401 return (0); 402 if (ISSET(iflag, BRKINT)) { 403 ttyflush(tp, FREAD | FWRITE); 404 if (tp->t_pgrp != NULL) { 405 PGRP_LOCK(tp->t_pgrp); 406 pgsignal(tp->t_pgrp, SIGINT, 1); 407 PGRP_UNLOCK(tp->t_pgrp); 408 } 409 goto endcase; 410 } 411 if (ISSET(iflag, PARMRK)) 412 goto parmrk; 413 } else if ((ISSET(err, TTY_PE) && ISSET(iflag, INPCK)) 414 || ISSET(err, TTY_FE)) { 415 if (ISSET(iflag, IGNPAR)) 416 return (0); 417 else if (ISSET(iflag, PARMRK)) { 418parmrk: 419 if (tp->t_rawq.c_cc + tp->t_canq.c_cc > 420 MAX_INPUT - 3) 421 goto input_overflow; 422 (void)putc(0377 | TTY_QUOTE, &tp->t_rawq); 423 (void)putc(0 | TTY_QUOTE, &tp->t_rawq); 424 (void)putc(c | TTY_QUOTE, &tp->t_rawq); 425 goto endcase; 426 } else 427 c = 0; 428 } 429 } 430 431 if (!ISSET(tp->t_state, TS_TYPEN) && ISSET(iflag, ISTRIP)) 432 CLR(c, 0x80); 433 if (!ISSET(lflag, EXTPROC)) { 434 /* 435 * Check for literal nexting very first 436 */ 437 if (ISSET(tp->t_state, TS_LNCH)) { 438 SET(c, TTY_QUOTE); 439 CLR(tp->t_state, TS_LNCH); 440 } 441 /* 442 * Scan for special characters. This code 443 * is really just a big case statement with 444 * non-constant cases. The bottom of the 445 * case statement is labeled ``endcase'', so goto 446 * it after a case match, or similar. 447 */ 448 449 /* 450 * Control chars which aren't controlled 451 * by ICANON, ISIG, or IXON. 452 */ 453 if (ISSET(lflag, IEXTEN)) { 454 if (CCEQ(cc[VLNEXT], c)) { 455 if (ISSET(lflag, ECHO)) { 456 if (ISSET(lflag, ECHOE)) { 457 (void)ttyoutput('^', tp); 458 (void)ttyoutput('\b', tp); 459 } else 460 ttyecho(c, tp); 461 } 462 SET(tp->t_state, TS_LNCH); 463 goto endcase; 464 } 465 if (CCEQ(cc[VDISCARD], c)) { 466 if (ISSET(lflag, FLUSHO)) 467 CLR(tp->t_lflag, FLUSHO); 468 else { 469 ttyflush(tp, FWRITE); 470 ttyecho(c, tp); 471 if (tp->t_rawq.c_cc + tp->t_canq.c_cc) 472 ttyretype(tp); 473 SET(tp->t_lflag, FLUSHO); 474 } 475 goto startoutput; 476 } 477 } 478 /* 479 * Signals. 480 */ 481 if (ISSET(lflag, ISIG)) { 482 if (CCEQ(cc[VINTR], c) || CCEQ(cc[VQUIT], c)) { 483 if (!ISSET(lflag, NOFLSH)) 484 ttyflush(tp, FREAD | FWRITE); 485 ttyecho(c, tp); 486 if (tp->t_pgrp != NULL) { 487 PGRP_LOCK(tp->t_pgrp); 488 pgsignal(tp->t_pgrp, 489 CCEQ(cc[VINTR], c) ? SIGINT : SIGQUIT, 1); 490 PGRP_UNLOCK(tp->t_pgrp); 491 } 492 goto endcase; 493 } 494 if (CCEQ(cc[VSUSP], c)) { 495 if (!ISSET(lflag, NOFLSH)) 496 ttyflush(tp, FREAD); 497 ttyecho(c, tp); 498 if (tp->t_pgrp != NULL) { 499 PGRP_LOCK(tp->t_pgrp); 500 pgsignal(tp->t_pgrp, SIGTSTP, 1); 501 PGRP_UNLOCK(tp->t_pgrp); 502 } 503 goto endcase; 504 } 505 } 506 /* 507 * Handle start/stop characters. 508 */ 509 if (ISSET(iflag, IXON)) { 510 if (CCEQ(cc[VSTOP], c)) { 511 if (!ISSET(tp->t_state, TS_TTSTOP)) { 512 SET(tp->t_state, TS_TTSTOP); 513 (*tp->t_stop)(tp, 0); 514 return (0); 515 } 516 if (!CCEQ(cc[VSTART], c)) 517 return (0); 518 /* 519 * if VSTART == VSTOP then toggle 520 */ 521 goto endcase; 522 } 523 if (CCEQ(cc[VSTART], c)) 524 goto restartoutput; 525 } 526 /* 527 * IGNCR, ICRNL, & INLCR 528 */ 529 if (c == '\r') { 530 if (ISSET(iflag, IGNCR)) 531 return (0); 532 else if (ISSET(iflag, ICRNL)) 533 c = '\n'; 534 } else if (c == '\n' && ISSET(iflag, INLCR)) 535 c = '\r'; 536 } 537 if (!ISSET(tp->t_lflag, EXTPROC) && ISSET(lflag, ICANON)) { 538 /* 539 * From here on down canonical mode character 540 * processing takes place. 541 */ 542 /* 543 * erase or erase2 (^H / ^?) 544 */ 545 if (CCEQ(cc[VERASE], c) || CCEQ(cc[VERASE2], c) ) { 546 if (tp->t_rawq.c_cc) 547 ttyrub(unputc(&tp->t_rawq), tp); 548 goto endcase; 549 } 550 /* 551 * kill (^U) 552 */ 553 if (CCEQ(cc[VKILL], c)) { 554 if (ISSET(lflag, ECHOKE) && 555 tp->t_rawq.c_cc == tp->t_rocount && 556 !ISSET(lflag, ECHOPRT)) 557 while (tp->t_rawq.c_cc) 558 ttyrub(unputc(&tp->t_rawq), tp); 559 else { 560 ttyecho(c, tp); 561 if (ISSET(lflag, ECHOK) || 562 ISSET(lflag, ECHOKE)) 563 ttyecho('\n', tp); 564 FLUSHQ(&tp->t_rawq); 565 tp->t_rocount = 0; 566 } 567 CLR(tp->t_state, TS_LOCAL); 568 goto endcase; 569 } 570 /* 571 * word erase (^W) 572 */ 573 if (CCEQ(cc[VWERASE], c) && ISSET(lflag, IEXTEN)) { 574 int ctype; 575 576 /* 577 * erase whitespace 578 */ 579 while ((c = unputc(&tp->t_rawq)) == ' ' || c == '\t') 580 ttyrub(c, tp); 581 if (c == -1) 582 goto endcase; 583 /* 584 * erase last char of word and remember the 585 * next chars type (for ALTWERASE) 586 */ 587 ttyrub(c, tp); 588 c = unputc(&tp->t_rawq); 589 if (c == -1) 590 goto endcase; 591 if (c == ' ' || c == '\t') { 592 (void)putc(c, &tp->t_rawq); 593 goto endcase; 594 } 595 ctype = ISALPHA(c); 596 /* 597 * erase rest of word 598 */ 599 do { 600 ttyrub(c, tp); 601 c = unputc(&tp->t_rawq); 602 if (c == -1) 603 goto endcase; 604 } while (c != ' ' && c != '\t' && 605 (!ISSET(lflag, ALTWERASE) || ISALPHA(c) == ctype)); 606 (void)putc(c, &tp->t_rawq); 607 goto endcase; 608 } 609 /* 610 * reprint line (^R) 611 */ 612 if (CCEQ(cc[VREPRINT], c) && ISSET(lflag, IEXTEN)) { 613 ttyretype(tp); 614 goto endcase; 615 } 616 /* 617 * ^T - kernel info and generate SIGINFO 618 */ 619 if (CCEQ(cc[VSTATUS], c) && ISSET(lflag, IEXTEN)) { 620 if (ISSET(lflag, ISIG) && tp->t_pgrp != NULL) { 621 PGRP_LOCK(tp->t_pgrp); 622 pgsignal(tp->t_pgrp, SIGINFO, 1); 623 PGRP_UNLOCK(tp->t_pgrp); 624 } 625 if (!ISSET(lflag, NOKERNINFO)) 626 ttyinfo(tp); 627 goto endcase; 628 } 629 } 630 /* 631 * Check for input buffer overflow 632 */ 633 if (tp->t_rawq.c_cc + tp->t_canq.c_cc >= MAX_INPUT) { 634input_overflow: 635 if (ISSET(iflag, IMAXBEL)) { 636 if (tp->t_outq.c_cc < tp->t_ohiwat) 637 (void)ttyoutput(CTRL('g'), tp); 638 } 639 goto endcase; 640 } 641 642 if ( c == 0377 && ISSET(iflag, PARMRK) && !ISSET(iflag, ISTRIP) 643 && ISSET(iflag, IGNBRK|IGNPAR) != (IGNBRK|IGNPAR)) 644 (void)putc(0377 | TTY_QUOTE, &tp->t_rawq); 645 646 /* 647 * Put data char in q for user and 648 * wakeup on seeing a line delimiter. 649 */ 650 if (putc(c, &tp->t_rawq) >= 0) { 651 if (!ISSET(lflag, ICANON)) { 652 ttwakeup(tp); 653 ttyecho(c, tp); 654 goto endcase; 655 } 656 if (TTBREAKC(c, lflag)) { 657 tp->t_rocount = 0; 658 catq(&tp->t_rawq, &tp->t_canq); 659 ttwakeup(tp); 660 } else if (tp->t_rocount++ == 0) 661 tp->t_rocol = tp->t_column; 662 if (ISSET(tp->t_state, TS_ERASE)) { 663 /* 664 * end of prterase \.../ 665 */ 666 CLR(tp->t_state, TS_ERASE); 667 (void)ttyoutput('/', tp); 668 } 669 i = tp->t_column; 670 ttyecho(c, tp); 671 if (CCEQ(cc[VEOF], c) && ISSET(lflag, ECHO)) { 672 /* 673 * Place the cursor over the '^' of the ^D. 674 */ 675 i = imin(2, tp->t_column - i); 676 while (i > 0) { 677 (void)ttyoutput('\b', tp); 678 i--; 679 } 680 } 681 } 682endcase: 683 /* 684 * IXANY means allow any character to restart output. 685 */ 686 if (ISSET(tp->t_state, TS_TTSTOP) && 687 !ISSET(iflag, IXANY) && cc[VSTART] != cc[VSTOP]) 688 return (0); 689restartoutput: 690 CLR(tp->t_lflag, FLUSHO); 691 CLR(tp->t_state, TS_TTSTOP); 692startoutput: 693 return (ttstart(tp)); 694} 695 696/* 697 * Output a single character on a tty, doing output processing 698 * as needed (expanding tabs, newline processing, etc.). 699 * Returns < 0 if succeeds, otherwise returns char to resend. 700 * Must be recursive. 701 */ 702static int 703ttyoutput(int c, struct tty *tp) 704{ 705 tcflag_t oflag; 706 int col, s; 707 708 oflag = tp->t_oflag; 709 if (!ISSET(oflag, OPOST)) { 710 if (ISSET(tp->t_lflag, FLUSHO)) 711 return (-1); 712 if (putc(c, &tp->t_outq)) 713 return (c); 714 tk_nout++; 715 tp->t_outcc++; 716 return (-1); 717 } 718 /* 719 * Do tab expansion if OXTABS is set. Special case if we external 720 * processing, we don't do the tab expansion because we'll probably 721 * get it wrong. If tab expansion needs to be done, let it happen 722 * externally. 723 */ 724 CLR(c, ~TTY_CHARMASK); 725 if (c == '\t' && 726 ISSET(oflag, OXTABS) && !ISSET(tp->t_lflag, EXTPROC)) { 727 c = 8 - (tp->t_column & 7); 728 if (!ISSET(tp->t_lflag, FLUSHO)) { 729 s = spltty(); /* Don't interrupt tabs. */ 730 c -= b_to_q(" ", c, &tp->t_outq); 731 tk_nout += c; 732 tp->t_outcc += c; 733 splx(s); 734 } 735 tp->t_column += c; 736 return (c ? -1 : '\t'); 737 } 738 if (c == CEOT && ISSET(oflag, ONOEOT)) 739 return (-1); 740 741 /* 742 * Newline translation: if ONLCR is set, 743 * translate newline into "\r\n". 744 */ 745 if (c == '\n' && ISSET(tp->t_oflag, ONLCR)) { 746 tk_nout++; 747 tp->t_outcc++; 748 if (!ISSET(tp->t_lflag, FLUSHO) && putc('\r', &tp->t_outq)) 749 return (c); 750 } 751 /* If OCRNL is set, translate "\r" into "\n". */ 752 else if (c == '\r' && ISSET(tp->t_oflag, OCRNL)) 753 c = '\n'; 754 /* If ONOCR is set, don't transmit CRs when on column 0. */ 755 else if (c == '\r' && ISSET(tp->t_oflag, ONOCR) && tp->t_column == 0) 756 return (-1); 757 758 tk_nout++; 759 tp->t_outcc++; 760 if (!ISSET(tp->t_lflag, FLUSHO) && putc(c, &tp->t_outq)) 761 return (c); 762 763 col = tp->t_column; 764 switch (CCLASS(c)) { 765 case BACKSPACE: 766 if (col > 0) 767 --col; 768 break; 769 case CONTROL: 770 break; 771 case NEWLINE: 772 if (ISSET(tp->t_oflag, ONLCR | ONLRET)) 773 col = 0; 774 break; 775 case RETURN: 776 col = 0; 777 break; 778 case ORDINARY: 779 ++col; 780 break; 781 case TAB: 782 col = (col + 8) & ~7; 783 break; 784 } 785 tp->t_column = col; 786 return (-1); 787} 788 789/* 790 * Ioctls for all tty devices. Called after line-discipline specific ioctl 791 * has been called to do discipline-specific functions and/or reject any 792 * of these ioctl commands. 793 */ 794/* ARGSUSED */ 795int 796ttioctl(struct tty *tp, u_long cmd, void *data, int flag) 797{ 798 struct proc *p; 799 struct thread *td; 800 struct pgrp *pgrp; 801 int s, error, bits, sig, sig2; 802 803 td = curthread; /* XXX */ 804 p = td->td_proc; 805 806 /* If the ioctl involves modification, hang if in the background. */ 807 switch (cmd) { 808 case TIOCCBRK: 809 case TIOCCONS: 810 case TIOCDRAIN: 811 case TIOCEXCL: 812 case TIOCFLUSH: 813#ifdef TIOCHPCL 814 case TIOCHPCL: 815#endif 816 case TIOCNXCL: 817 case TIOCSBRK: 818 case TIOCSCTTY: 819 case TIOCSDRAINWAIT: 820 case TIOCSETA: 821 case TIOCSETAF: 822 case TIOCSETAW: 823 case TIOCSETD: 824 case TIOCSPGRP: 825 case TIOCSTART: 826 case TIOCSTAT: 827 case TIOCSTI: 828 case TIOCSTOP: 829 case TIOCSWINSZ: 830#ifndef BURN_BRIDGES 831#if defined(COMPAT_43) 832 case TIOCLBIC: 833 case TIOCLBIS: 834 case TIOCLSET: 835 case TIOCSETC: 836 case OTIOCSETD: 837 case TIOCSETN: 838 case TIOCSETP: 839 case TIOCSLTC: 840#endif 841#endif 842 sx_slock(&proctree_lock); 843 PROC_LOCK(p); 844 while (isbackground(p, tp) && !(p->p_flag & P_PPWAIT) && 845 !SIGISMEMBER(p->p_sigacts->ps_sigignore, SIGTTOU) && 846 !SIGISMEMBER(td->td_sigmask, SIGTTOU)) { 847 pgrp = p->p_pgrp; 848 PROC_UNLOCK(p); 849 if (pgrp->pg_jobc == 0) { 850 sx_sunlock(&proctree_lock); 851 return (EIO); 852 } 853 PGRP_LOCK(pgrp); 854 sx_sunlock(&proctree_lock); 855 pgsignal(pgrp, SIGTTOU, 1); 856 PGRP_UNLOCK(pgrp); 857 error = ttysleep(tp, &lbolt, TTOPRI | PCATCH, "ttybg1", 858 0); 859 if (error) 860 return (error); 861 sx_slock(&proctree_lock); 862 PROC_LOCK(p); 863 } 864 PROC_UNLOCK(p); 865 sx_sunlock(&proctree_lock); 866 break; 867 } 868 869 if (tp->t_break != NULL) { 870 switch (cmd) { 871 case TIOCSBRK: 872 tp->t_break(tp, 1); 873 return (0); 874 case TIOCCBRK: 875 tp->t_break(tp, 0); 876 return (0); 877 default: 878 break; 879 } 880 } 881 882 if (tp->t_modem != NULL) { 883 switch (cmd) { 884 case TIOCSDTR: 885 tp->t_modem(tp, SER_DTR, 0); 886 return (0); 887 case TIOCCDTR: 888 tp->t_modem(tp, 0, SER_DTR); 889 return (0); 890 case TIOCMSET: 891 bits = *(int *)data; 892 sig = (bits & (TIOCM_DTR | TIOCM_RTS)) >> 1; 893 sig2 = ((~bits) & (TIOCM_DTR | TIOCM_RTS)) >> 1; 894 tp->t_modem(tp, sig, sig2); 895 return (0); 896 case TIOCMBIS: 897 bits = *(int *)data; 898 sig = (bits & (TIOCM_DTR | TIOCM_RTS)) >> 1; 899 tp->t_modem(tp, sig, 0); 900 return (0); 901 case TIOCMBIC: 902 bits = *(int *)data; 903 sig = (bits & (TIOCM_DTR | TIOCM_RTS)) >> 1; 904 tp->t_modem(tp, 0, sig); 905 return (0); 906 case TIOCMGET: 907 sig = tp->t_modem(tp, 0, 0); 908 /* See <sys/serial.h. for the "<< 1" stuff */ 909 bits = TIOCM_LE + (sig << 1); 910 *(int *)data = bits; 911 return (0); 912 default: 913 break; 914 } 915 } 916 917 switch (cmd) { /* Process the ioctl. */ 918 case FIOASYNC: /* set/clear async i/o */ 919 s = spltty(); 920 if (*(int *)data) 921 SET(tp->t_state, TS_ASYNC); 922 else 923 CLR(tp->t_state, TS_ASYNC); 924 splx(s); 925 break; 926 case FIONBIO: /* set/clear non-blocking i/o */ 927 break; /* XXX: delete. */ 928 case FIONREAD: /* get # bytes to read */ 929 s = spltty(); 930 *(int *)data = ttnread(tp); 931 splx(s); 932 break; 933 934 case FIOSETOWN: 935 /* 936 * Policy -- Don't allow FIOSETOWN on someone else's 937 * controlling tty 938 */ 939 if (tp->t_session != NULL && !isctty(p, tp)) 940 return (ENOTTY); 941 942 error = fsetown(*(int *)data, &tp->t_sigio); 943 if (error) 944 return (error); 945 break; 946 case FIOGETOWN: 947 if (tp->t_session != NULL && !isctty(p, tp)) 948 return (ENOTTY); 949 *(int *)data = fgetown(&tp->t_sigio); 950 break; 951 952 case TIOCEXCL: /* set exclusive use of tty */ 953 s = spltty(); 954 SET(tp->t_state, TS_XCLUDE); 955 splx(s); 956 break; 957 case TIOCFLUSH: { /* flush buffers */ 958 int flags = *(int *)data; 959 960 if (flags == 0) 961 flags = FREAD | FWRITE; 962 else 963 flags &= FREAD | FWRITE; 964 ttyflush(tp, flags); 965 break; 966 } 967 case TIOCCONS: /* become virtual console */ 968 if (*(int *)data) { 969 struct nameidata nid; 970 971 if (constty && constty != tp && 972 ISSET(constty->t_state, TS_CONNECTED)) 973 return (EBUSY); 974 975 /* Ensure user can open the real console. */ 976 NDINIT(&nid, LOOKUP, LOCKLEAF | FOLLOW, UIO_SYSSPACE, 977 "/dev/console", td); 978 if ((error = namei(&nid)) != 0) 979 return (error); 980 NDFREE(&nid, NDF_ONLY_PNBUF); 981 error = VOP_ACCESS(nid.ni_vp, VREAD, td->td_ucred, td); 982 vput(nid.ni_vp); 983 if (error) 984 return (error); 985 986 constty_set(tp); 987 } else if (tp == constty) 988 constty_clear(); 989 break; 990 case TIOCDRAIN: /* wait till output drained */ 991 error = ttywait(tp); 992 if (error) 993 return (error); 994 break; 995 case TIOCGETA: { /* get termios struct */ 996 struct termios *t = (struct termios *)data; 997 998 bcopy(&tp->t_termios, t, sizeof(struct termios)); 999 break; 1000 } 1001 case TIOCGETD: /* get line discipline */ 1002 *(int *)data = tp->t_line; 1003 break; 1004 case TIOCGWINSZ: /* get window size */ 1005 *(struct winsize *)data = tp->t_winsize; 1006 break; 1007 case TIOCGPGRP: /* get pgrp of tty */ 1008 if (!isctty(p, tp)) 1009 return (ENOTTY); 1010 *(int *)data = tp->t_pgrp ? tp->t_pgrp->pg_id : NO_PID; 1011 break; 1012#ifdef TIOCHPCL 1013 case TIOCHPCL: /* hang up on last close */ 1014 s = spltty(); 1015 SET(tp->t_cflag, HUPCL); 1016 splx(s); 1017 break; 1018#endif 1019 case TIOCMGDTRWAIT: 1020 *(int *)data = tp->t_dtr_wait * 100 / hz; 1021 break; 1022 case TIOCMSDTRWAIT: 1023 /* must be root since the wait applies to following logins */ 1024 error = suser(td); 1025 if (error) 1026 return (error); 1027 tp->t_dtr_wait = *(int *)data * hz / 100; 1028 break; 1029 case TIOCNXCL: /* reset exclusive use of tty */ 1030 s = spltty(); 1031 CLR(tp->t_state, TS_XCLUDE); 1032 splx(s); 1033 break; 1034 case TIOCOUTQ: /* output queue size */ 1035 *(int *)data = tp->t_outq.c_cc; 1036 break; 1037 case TIOCSETA: /* set termios struct */ 1038 case TIOCSETAW: /* drain output, set */ 1039 case TIOCSETAF: { /* drn out, fls in, set */ 1040 struct termios *t = (struct termios *)data; 1041 1042 if (t->c_ispeed == 0) 1043 t->c_ispeed = t->c_ospeed; 1044 if (t->c_ispeed == 0) 1045 t->c_ispeed = tp->t_ospeed; 1046 if (t->c_ispeed == 0) 1047 return (EINVAL); 1048 s = spltty(); 1049 if (cmd == TIOCSETAW || cmd == TIOCSETAF) { 1050 error = ttywait(tp); 1051 if (error) { 1052 splx(s); 1053 return (error); 1054 } 1055 if (cmd == TIOCSETAF) 1056 ttyflush(tp, FREAD); 1057 } 1058 if (!ISSET(t->c_cflag, CIGNORE)) { 1059 /* 1060 * Set device hardware. 1061 */ 1062 if (tp->t_param && (error = (*tp->t_param)(tp, t))) { 1063 splx(s); 1064 return (error); 1065 } 1066 if (ISSET(t->c_cflag, CLOCAL) && 1067 !ISSET(tp->t_cflag, CLOCAL)) { 1068 /* 1069 * XXX disconnections would be too hard to 1070 * get rid of without this kludge. The only 1071 * way to get rid of controlling terminals 1072 * is to exit from the session leader. 1073 */ 1074 CLR(tp->t_state, TS_ZOMBIE); 1075 1076 wakeup(TSA_CARR_ON(tp)); 1077 ttwakeup(tp); 1078 ttwwakeup(tp); 1079 } 1080 if ((ISSET(tp->t_state, TS_CARR_ON) || 1081 ISSET(t->c_cflag, CLOCAL)) && 1082 !ISSET(tp->t_state, TS_ZOMBIE)) 1083 SET(tp->t_state, TS_CONNECTED); 1084 else 1085 CLR(tp->t_state, TS_CONNECTED); 1086 tp->t_cflag = t->c_cflag; 1087 tp->t_ispeed = t->c_ispeed; 1088 if (t->c_ospeed != 0) 1089 tp->t_ospeed = t->c_ospeed; 1090 ttsetwater(tp); 1091 } 1092 if (ISSET(t->c_lflag, ICANON) != ISSET(tp->t_lflag, ICANON) && 1093 cmd != TIOCSETAF) { 1094 if (ISSET(t->c_lflag, ICANON)) 1095 SET(tp->t_lflag, PENDIN); 1096 else { 1097 /* 1098 * XXX we really shouldn't allow toggling 1099 * ICANON while we're in a non-termios line 1100 * discipline. Now we have to worry about 1101 * panicing for a null queue. 1102 */ 1103 if (tp->t_canq.c_cbreserved > 0 && 1104 tp->t_rawq.c_cbreserved > 0) { 1105 catq(&tp->t_rawq, &tp->t_canq); 1106 /* 1107 * XXX the queue limits may be 1108 * different, so the old queue 1109 * swapping method no longer works. 1110 */ 1111 catq(&tp->t_canq, &tp->t_rawq); 1112 } 1113 CLR(tp->t_lflag, PENDIN); 1114 } 1115 ttwakeup(tp); 1116 } 1117 tp->t_iflag = t->c_iflag; 1118 tp->t_oflag = t->c_oflag; 1119 /* 1120 * Make the EXTPROC bit read only. 1121 */ 1122 if (ISSET(tp->t_lflag, EXTPROC)) 1123 SET(t->c_lflag, EXTPROC); 1124 else 1125 CLR(t->c_lflag, EXTPROC); 1126 tp->t_lflag = t->c_lflag | ISSET(tp->t_lflag, PENDIN); 1127 if (t->c_cc[VMIN] != tp->t_cc[VMIN] || 1128 t->c_cc[VTIME] != tp->t_cc[VTIME]) 1129 ttwakeup(tp); 1130 bcopy(t->c_cc, tp->t_cc, sizeof(t->c_cc)); 1131 splx(s); 1132 break; 1133 } 1134 case TIOCSETD: { /* set line discipline */ 1135 int t = *(int *)data; 1136 1137 if ((u_int)t >= nlinesw) 1138 return (ENXIO); 1139 if (t == tp->t_line) 1140 return (0); 1141 s = spltty(); 1142 ttyld_close(tp, flag); 1143 tp->t_line = t; 1144 /* XXX: we should use the correct cdev here */ 1145 error = ttyld_open(tp, tp->t_dev); 1146 if (error) { 1147 /* 1148 * If we fail to switch line discipline we cannot 1149 * fall back to the previous, because we can not 1150 * trust that ldisc to open successfully either. 1151 * Fall back to the default ldisc which we know 1152 * will allways succeed. 1153 */ 1154 tp->t_line = TTYDISC; 1155 (void)ttyld_open(tp, tp->t_dev); 1156 } 1157 splx(s); 1158 return (error); 1159 break; 1160 } 1161 case TIOCSTART: /* start output, like ^Q */ 1162 s = spltty(); 1163 if (ISSET(tp->t_state, TS_TTSTOP) || 1164 ISSET(tp->t_lflag, FLUSHO)) { 1165 CLR(tp->t_lflag, FLUSHO); 1166 CLR(tp->t_state, TS_TTSTOP); 1167 ttstart(tp); 1168 } 1169 splx(s); 1170 break; 1171 case TIOCSTI: /* simulate terminal input */ 1172 if ((flag & FREAD) == 0 && suser(td)) 1173 return (EPERM); 1174 if (!isctty(p, tp) && suser(td)) 1175 return (EACCES); 1176 s = spltty(); 1177 ttyld_rint(tp, *(u_char *)data); 1178 splx(s); 1179 break; 1180 case TIOCSTOP: /* stop output, like ^S */ 1181 s = spltty(); 1182 if (!ISSET(tp->t_state, TS_TTSTOP)) { 1183 SET(tp->t_state, TS_TTSTOP); 1184 (*tp->t_stop)(tp, 0); 1185 } 1186 splx(s); 1187 break; 1188 case TIOCSCTTY: /* become controlling tty */ 1189 /* Session ctty vnode pointer set in vnode layer. */ 1190 sx_slock(&proctree_lock); 1191 if (!SESS_LEADER(p) || 1192 ((p->p_session->s_ttyvp || tp->t_session) && 1193 (tp->t_session != p->p_session))) { 1194 sx_sunlock(&proctree_lock); 1195 return (EPERM); 1196 } 1197 tp->t_session = p->p_session; 1198 tp->t_pgrp = p->p_pgrp; 1199 SESS_LOCK(p->p_session); 1200 ttyref(tp); /* ttyrel(): kern_proc.c:pgdelete() */ 1201 p->p_session->s_ttyp = tp; 1202 SESS_UNLOCK(p->p_session); 1203 PROC_LOCK(p); 1204 p->p_flag |= P_CONTROLT; 1205 PROC_UNLOCK(p); 1206 sx_sunlock(&proctree_lock); 1207 break; 1208 case TIOCSPGRP: { /* set pgrp of tty */ 1209 sx_slock(&proctree_lock); 1210 pgrp = pgfind(*(int *)data); 1211 if (!isctty(p, tp)) { 1212 if (pgrp != NULL) 1213 PGRP_UNLOCK(pgrp); 1214 sx_sunlock(&proctree_lock); 1215 return (ENOTTY); 1216 } 1217 if (pgrp == NULL) { 1218 sx_sunlock(&proctree_lock); 1219 return (EPERM); 1220 } 1221 PGRP_UNLOCK(pgrp); 1222 if (pgrp->pg_session != p->p_session) { 1223 sx_sunlock(&proctree_lock); 1224 return (EPERM); 1225 } 1226 sx_sunlock(&proctree_lock); 1227 tp->t_pgrp = pgrp; 1228 break; 1229 } 1230 case TIOCSTAT: /* simulate control-T */ 1231 s = spltty(); 1232 ttyinfo(tp); 1233 splx(s); 1234 break; 1235 case TIOCSWINSZ: /* set window size */ 1236 if (bcmp((caddr_t)&tp->t_winsize, data, 1237 sizeof (struct winsize))) { 1238 tp->t_winsize = *(struct winsize *)data; 1239 if (tp->t_pgrp != NULL) { 1240 PGRP_LOCK(tp->t_pgrp); 1241 pgsignal(tp->t_pgrp, SIGWINCH, 1); 1242 PGRP_UNLOCK(tp->t_pgrp); 1243 } 1244 } 1245 break; 1246 case TIOCSDRAINWAIT: 1247 error = suser(td); 1248 if (error) 1249 return (error); 1250 tp->t_timeout = *(int *)data * hz; 1251 wakeup(TSA_OCOMPLETE(tp)); 1252 wakeup(TSA_OLOWAT(tp)); 1253 break; 1254 case TIOCGDRAINWAIT: 1255 *(int *)data = tp->t_timeout / hz; 1256 break; 1257 default: 1258#if defined(COMPAT_43) 1259#ifndef BURN_BRIDGES 1260 return (ttcompat(tp, cmd, data, flag)); 1261#else 1262 return (ENOIOCTL); 1263#endif 1264#else 1265 return (ENOIOCTL); 1266#endif 1267 } 1268 return (0); 1269} 1270 1271int 1272ttypoll(struct cdev *dev, int events, struct thread *td) 1273{ 1274 int s; 1275 int revents = 0; 1276 struct tty *tp; 1277 1278 tp = tty_gettp(dev); 1279 1280 if (tp == NULL) /* XXX used to return ENXIO, but that means true! */ 1281 return ((events & (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM)) 1282 | POLLHUP); 1283 1284 s = spltty(); 1285 if (events & (POLLIN | POLLRDNORM)) { 1286 if (ISSET(tp->t_state, TS_ZOMBIE)) 1287 revents |= (events & (POLLIN | POLLRDNORM)) | 1288 POLLHUP; 1289 else if (ttnread(tp) > 0) 1290 revents |= events & (POLLIN | POLLRDNORM); 1291 else 1292 selrecord(td, &tp->t_rsel); 1293 } 1294 if (events & POLLOUT) { 1295 if (ISSET(tp->t_state, TS_ZOMBIE)) 1296 revents |= POLLHUP; 1297 else if (tp->t_outq.c_cc <= tp->t_olowat && 1298 ISSET(tp->t_state, TS_CONNECTED)) 1299 revents |= events & POLLOUT; 1300 else 1301 selrecord(td, &tp->t_wsel); 1302 } 1303 splx(s); 1304 return (revents); 1305} 1306 1307static struct filterops ttyread_filtops = 1308 { 1, NULL, filt_ttyrdetach, filt_ttyread }; 1309static struct filterops ttywrite_filtops = 1310 { 1, NULL, filt_ttywdetach, filt_ttywrite }; 1311 1312int 1313ttykqfilter(struct cdev *dev, struct knote *kn) 1314{ 1315 struct tty *tp; 1316 struct knlist *klist; 1317 int s; 1318 1319 tp = tty_gettp(dev); 1320 1321 switch (kn->kn_filter) { 1322 case EVFILT_READ: 1323 klist = &tp->t_rsel.si_note; 1324 kn->kn_fop = &ttyread_filtops; 1325 break; 1326 case EVFILT_WRITE: 1327 klist = &tp->t_wsel.si_note; 1328 kn->kn_fop = &ttywrite_filtops; 1329 break; 1330 default: 1331 return (EINVAL); 1332 } 1333 1334 kn->kn_hook = (caddr_t)dev; 1335 1336 s = spltty(); 1337 knlist_add(klist, kn, 0); 1338 splx(s); 1339 1340 return (0); 1341} 1342 1343static void 1344filt_ttyrdetach(struct knote *kn) 1345{ 1346 struct tty *tp = ((struct cdev *)kn->kn_hook)->si_tty; 1347 int s = spltty(); 1348 1349 knlist_remove(&tp->t_rsel.si_note, kn, 0); 1350 splx(s); 1351} 1352 1353static int 1354filt_ttyread(struct knote *kn, long hint) 1355{ 1356 struct tty *tp = ((struct cdev *)kn->kn_hook)->si_tty; 1357 1358 kn->kn_data = ttnread(tp); 1359 if (ISSET(tp->t_state, TS_ZOMBIE)) { 1360 kn->kn_flags |= EV_EOF; 1361 return (1); 1362 } 1363 return (kn->kn_data > 0); 1364} 1365 1366static void 1367filt_ttywdetach(struct knote *kn) 1368{ 1369 struct tty *tp = ((struct cdev *)kn->kn_hook)->si_tty; 1370 int s = spltty(); 1371 1372 knlist_remove(&tp->t_wsel.si_note, kn, 0); 1373 splx(s); 1374} 1375 1376static int 1377filt_ttywrite(struct knote *kn, long hint) 1378{ 1379 struct tty *tp = ((struct cdev *)kn->kn_hook)->si_tty; 1380 1381 kn->kn_data = tp->t_outq.c_cc; 1382 if (ISSET(tp->t_state, TS_ZOMBIE)) 1383 return (1); 1384 return (kn->kn_data <= tp->t_olowat && 1385 ISSET(tp->t_state, TS_CONNECTED)); 1386} 1387 1388/* 1389 * Must be called at spltty(). 1390 */ 1391static int 1392ttnread(struct tty *tp) 1393{ 1394 int nread; 1395 1396 if (ISSET(tp->t_lflag, PENDIN)) 1397 ttypend(tp); 1398 nread = tp->t_canq.c_cc; 1399 if (!ISSET(tp->t_lflag, ICANON)) { 1400 nread += tp->t_rawq.c_cc; 1401 if (nread < tp->t_cc[VMIN] && tp->t_cc[VTIME] == 0) 1402 nread = 0; 1403 } 1404 return (nread); 1405} 1406 1407/* 1408 * Wait for output to drain. 1409 */ 1410int 1411ttywait(struct tty *tp) 1412{ 1413 int error, s; 1414 1415 error = 0; 1416 s = spltty(); 1417 while ((tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY)) && 1418 ISSET(tp->t_state, TS_CONNECTED) && tp->t_oproc) { 1419 (*tp->t_oproc)(tp); 1420 if ((tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY)) && 1421 ISSET(tp->t_state, TS_CONNECTED)) { 1422 SET(tp->t_state, TS_SO_OCOMPLETE); 1423 error = ttysleep(tp, TSA_OCOMPLETE(tp), 1424 TTOPRI | PCATCH, "ttywai", 1425 tp->t_timeout); 1426 if (error) { 1427 if (error == EWOULDBLOCK) 1428 error = EIO; 1429 break; 1430 } 1431 } else 1432 break; 1433 } 1434 if (!error && (tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY))) 1435 error = EIO; 1436 splx(s); 1437 return (error); 1438} 1439 1440/* 1441 * Flush if successfully wait. 1442 */ 1443static int 1444ttywflush(struct tty *tp) 1445{ 1446 int error; 1447 1448 if ((error = ttywait(tp)) == 0) 1449 ttyflush(tp, FREAD); 1450 return (error); 1451} 1452 1453/* 1454 * Flush tty read and/or write queues, notifying anyone waiting. 1455 */ 1456void 1457ttyflush(struct tty *tp, int rw) 1458{ 1459 int s; 1460 1461 s = spltty(); 1462#if 0 1463again: 1464#endif 1465 if (rw & FWRITE) { 1466 FLUSHQ(&tp->t_outq); 1467 CLR(tp->t_state, TS_TTSTOP); 1468 } 1469 (*tp->t_stop)(tp, rw); 1470 if (rw & FREAD) { 1471 FLUSHQ(&tp->t_canq); 1472 FLUSHQ(&tp->t_rawq); 1473 CLR(tp->t_lflag, PENDIN); 1474 tp->t_rocount = 0; 1475 tp->t_rocol = 0; 1476 CLR(tp->t_state, TS_LOCAL); 1477 ttwakeup(tp); 1478 if (ISSET(tp->t_state, TS_TBLOCK)) { 1479 if (rw & FWRITE) 1480 FLUSHQ(&tp->t_outq); 1481 ttyunblock(tp); 1482 1483 /* 1484 * Don't let leave any state that might clobber the 1485 * next line discipline (although we should do more 1486 * to send the START char). Not clearing the state 1487 * may have caused the "putc to a clist with no 1488 * reserved cblocks" panic/printf. 1489 */ 1490 CLR(tp->t_state, TS_TBLOCK); 1491 1492#if 0 /* forget it, sleeping isn't always safe and we don't know when it is */ 1493 if (ISSET(tp->t_iflag, IXOFF)) { 1494 /* 1495 * XXX wait a bit in the hope that the stop 1496 * character (if any) will go out. Waiting 1497 * isn't good since it allows races. This 1498 * will be fixed when the stop character is 1499 * put in a special queue. Don't bother with 1500 * the checks in ttywait() since the timeout 1501 * will save us. 1502 */ 1503 SET(tp->t_state, TS_SO_OCOMPLETE); 1504 ttysleep(tp, TSA_OCOMPLETE(tp), TTOPRI, 1505 "ttyfls", hz / 10); 1506 /* 1507 * Don't try sending the stop character again. 1508 */ 1509 CLR(tp->t_state, TS_TBLOCK); 1510 goto again; 1511 } 1512#endif 1513 } 1514 } 1515 if (rw & FWRITE) { 1516 FLUSHQ(&tp->t_outq); 1517 ttwwakeup(tp); 1518 } 1519 splx(s); 1520} 1521 1522/* 1523 * Copy in the default termios characters. 1524 */ 1525void 1526termioschars(struct termios *t) 1527{ 1528 1529 bcopy(ttydefchars, t->c_cc, sizeof t->c_cc); 1530} 1531 1532/* 1533 * Old interface. 1534 */ 1535void 1536ttychars(struct tty *tp) 1537{ 1538 1539 termioschars(&tp->t_termios); 1540} 1541 1542/* 1543 * Handle input high water. Send stop character for the IXOFF case. Turn 1544 * on our input flow control bit and propagate the changes to the driver. 1545 * XXX the stop character should be put in a special high priority queue. 1546 */ 1547void 1548ttyblock(struct tty *tp) 1549{ 1550 1551 SET(tp->t_state, TS_TBLOCK); 1552 if (ISSET(tp->t_iflag, IXOFF) && tp->t_cc[VSTOP] != _POSIX_VDISABLE && 1553 putc(tp->t_cc[VSTOP], &tp->t_outq) != 0) 1554 CLR(tp->t_state, TS_TBLOCK); /* try again later */ 1555 ttstart(tp); 1556} 1557 1558/* 1559 * Handle input low water. Send start character for the IXOFF case. Turn 1560 * off our input flow control bit and propagate the changes to the driver. 1561 * XXX the start character should be put in a special high priority queue. 1562 */ 1563static void 1564ttyunblock(struct tty *tp) 1565{ 1566 1567 CLR(tp->t_state, TS_TBLOCK); 1568 if (ISSET(tp->t_iflag, IXOFF) && tp->t_cc[VSTART] != _POSIX_VDISABLE && 1569 putc(tp->t_cc[VSTART], &tp->t_outq) != 0) 1570 SET(tp->t_state, TS_TBLOCK); /* try again later */ 1571 ttstart(tp); 1572} 1573 1574#ifdef notyet 1575/* Not used by any current (i386) drivers. */ 1576/* 1577 * Restart after an inter-char delay. 1578 */ 1579void 1580ttrstrt(void *tp_arg) 1581{ 1582 struct tty *tp; 1583 int s; 1584 1585 KASSERT(tp_arg != NULL, ("ttrstrt")); 1586 1587 tp = tp_arg; 1588 s = spltty(); 1589 1590 CLR(tp->t_state, TS_TIMEOUT); 1591 ttstart(tp); 1592 1593 splx(s); 1594} 1595#endif 1596 1597int 1598ttstart(struct tty *tp) 1599{ 1600 1601 if (tp->t_oproc != NULL) /* XXX: Kludge for pty. */ 1602 (*tp->t_oproc)(tp); 1603 return (0); 1604} 1605 1606/* 1607 * "close" a line discipline 1608 */ 1609int 1610ttylclose(struct tty *tp, int flag) 1611{ 1612 1613 if (flag & FNONBLOCK || ttywflush(tp)) 1614 ttyflush(tp, FREAD | FWRITE); 1615 return (0); 1616} 1617 1618/* 1619 * Handle modem control transition on a tty. 1620 * Flag indicates new state of carrier. 1621 * Returns 0 if the line should be turned off, otherwise 1. 1622 */ 1623int 1624ttymodem(struct tty *tp, int flag) 1625{ 1626 1627 if (ISSET(tp->t_state, TS_CARR_ON) && ISSET(tp->t_cflag, MDMBUF)) { 1628 /* 1629 * MDMBUF: do flow control according to carrier flag 1630 * XXX TS_CAR_OFLOW doesn't do anything yet. TS_TTSTOP 1631 * works if IXON and IXANY are clear. 1632 */ 1633 if (flag) { 1634 CLR(tp->t_state, TS_CAR_OFLOW); 1635 CLR(tp->t_state, TS_TTSTOP); 1636 ttstart(tp); 1637 } else if (!ISSET(tp->t_state, TS_CAR_OFLOW)) { 1638 SET(tp->t_state, TS_CAR_OFLOW); 1639 SET(tp->t_state, TS_TTSTOP); 1640 (*tp->t_stop)(tp, 0); 1641 } 1642 } else if (flag == 0) { 1643 /* 1644 * Lost carrier. 1645 */ 1646 CLR(tp->t_state, TS_CARR_ON); 1647 if (ISSET(tp->t_state, TS_ISOPEN) && 1648 !ISSET(tp->t_cflag, CLOCAL)) { 1649 SET(tp->t_state, TS_ZOMBIE); 1650 CLR(tp->t_state, TS_CONNECTED); 1651 if (tp->t_session) { 1652 sx_slock(&proctree_lock); 1653 if (tp->t_session->s_leader) { 1654 struct proc *p; 1655 1656 p = tp->t_session->s_leader; 1657 PROC_LOCK(p); 1658 psignal(p, SIGHUP); 1659 PROC_UNLOCK(p); 1660 } 1661 sx_sunlock(&proctree_lock); 1662 } 1663 ttyflush(tp, FREAD | FWRITE); 1664 return (0); 1665 } 1666 } else { 1667 /* 1668 * Carrier now on. 1669 */ 1670 SET(tp->t_state, TS_CARR_ON); 1671 if (!ISSET(tp->t_state, TS_ZOMBIE)) 1672 SET(tp->t_state, TS_CONNECTED); 1673 wakeup(TSA_CARR_ON(tp)); 1674 ttwakeup(tp); 1675 ttwwakeup(tp); 1676 } 1677 return (1); 1678} 1679 1680/* 1681 * Reinput pending characters after state switch 1682 * call at spltty(). 1683 */ 1684static void 1685ttypend(struct tty *tp) 1686{ 1687 struct clist tq; 1688 int c; 1689 1690 CLR(tp->t_lflag, PENDIN); 1691 SET(tp->t_state, TS_TYPEN); 1692 /* 1693 * XXX this assumes too much about clist internals. It may even 1694 * fail if the cblock slush pool is empty. We can't allocate more 1695 * cblocks here because we are called from an interrupt handler 1696 * and clist_alloc_cblocks() can wait. 1697 */ 1698 tq = tp->t_rawq; 1699 bzero(&tp->t_rawq, sizeof tp->t_rawq); 1700 tp->t_rawq.c_cbmax = tq.c_cbmax; 1701 tp->t_rawq.c_cbreserved = tq.c_cbreserved; 1702 while ((c = getc(&tq)) >= 0) 1703 ttyinput(c, tp); 1704 CLR(tp->t_state, TS_TYPEN); 1705} 1706 1707/* 1708 * Process a read call on a tty device. 1709 */ 1710int 1711ttread(struct tty *tp, struct uio *uio, int flag) 1712{ 1713 struct clist *qp; 1714 int c; 1715 tcflag_t lflag; 1716 cc_t *cc = tp->t_cc; 1717 struct thread *td; 1718 struct proc *p; 1719 int s, first, error = 0; 1720 int has_stime = 0, last_cc = 0; 1721 long slp = 0; /* XXX this should be renamed `timo'. */ 1722 struct timeval stime; 1723 struct pgrp *pg; 1724 1725 td = curthread; 1726 p = td->td_proc; 1727loop: 1728 s = spltty(); 1729 lflag = tp->t_lflag; 1730 /* 1731 * take pending input first 1732 */ 1733 if (ISSET(lflag, PENDIN)) { 1734 ttypend(tp); 1735 splx(s); /* reduce latency */ 1736 s = spltty(); 1737 lflag = tp->t_lflag; /* XXX ttypend() clobbers it */ 1738 } 1739 1740 /* 1741 * Hang process if it's in the background. 1742 */ 1743 if (isbackground(p, tp)) { 1744 splx(s); 1745 sx_slock(&proctree_lock); 1746 PROC_LOCK(p); 1747 if (SIGISMEMBER(p->p_sigacts->ps_sigignore, SIGTTIN) || 1748 SIGISMEMBER(td->td_sigmask, SIGTTIN) || 1749 (p->p_flag & P_PPWAIT) || p->p_pgrp->pg_jobc == 0) { 1750 PROC_UNLOCK(p); 1751 sx_sunlock(&proctree_lock); 1752 return (EIO); 1753 } 1754 pg = p->p_pgrp; 1755 PROC_UNLOCK(p); 1756 PGRP_LOCK(pg); 1757 sx_sunlock(&proctree_lock); 1758 pgsignal(pg, SIGTTIN, 1); 1759 PGRP_UNLOCK(pg); 1760 error = ttysleep(tp, &lbolt, TTIPRI | PCATCH, "ttybg2", 0); 1761 if (error) 1762 return (error); 1763 goto loop; 1764 } 1765 1766 if (ISSET(tp->t_state, TS_ZOMBIE)) { 1767 splx(s); 1768 return (0); /* EOF */ 1769 } 1770 1771 /* 1772 * If canonical, use the canonical queue, 1773 * else use the raw queue. 1774 * 1775 * (should get rid of clists...) 1776 */ 1777 qp = ISSET(lflag, ICANON) ? &tp->t_canq : &tp->t_rawq; 1778 1779 if (flag & IO_NDELAY) { 1780 if (qp->c_cc > 0) 1781 goto read; 1782 if (!ISSET(lflag, ICANON) && cc[VMIN] == 0) { 1783 splx(s); 1784 return (0); 1785 } 1786 splx(s); 1787 return (EWOULDBLOCK); 1788 } 1789 if (!ISSET(lflag, ICANON)) { 1790 int m = cc[VMIN]; 1791 long t = cc[VTIME]; 1792 struct timeval timecopy; 1793 1794 /* 1795 * Check each of the four combinations. 1796 * (m > 0 && t == 0) is the normal read case. 1797 * It should be fairly efficient, so we check that and its 1798 * companion case (m == 0 && t == 0) first. 1799 * For the other two cases, we compute the target sleep time 1800 * into slp. 1801 */ 1802 if (t == 0) { 1803 if (qp->c_cc < m) 1804 goto sleep; 1805 if (qp->c_cc > 0) 1806 goto read; 1807 1808 /* m, t and qp->c_cc are all 0. 0 is enough input. */ 1809 splx(s); 1810 return (0); 1811 } 1812 t *= 100000; /* time in us */ 1813#define diff(t1, t2) (((t1).tv_sec - (t2).tv_sec) * 1000000 + \ 1814 ((t1).tv_usec - (t2).tv_usec)) 1815 if (m > 0) { 1816 if (qp->c_cc <= 0) 1817 goto sleep; 1818 if (qp->c_cc >= m) 1819 goto read; 1820 getmicrotime(&timecopy); 1821 if (!has_stime) { 1822 /* first character, start timer */ 1823 has_stime = 1; 1824 stime = timecopy; 1825 slp = t; 1826 } else if (qp->c_cc > last_cc) { 1827 /* got a character, restart timer */ 1828 stime = timecopy; 1829 slp = t; 1830 } else { 1831 /* nothing, check expiration */ 1832 slp = t - diff(timecopy, stime); 1833 if (slp <= 0) 1834 goto read; 1835 } 1836 last_cc = qp->c_cc; 1837 } else { /* m == 0 */ 1838 if (qp->c_cc > 0) 1839 goto read; 1840 getmicrotime(&timecopy); 1841 if (!has_stime) { 1842 has_stime = 1; 1843 stime = timecopy; 1844 slp = t; 1845 } else { 1846 slp = t - diff(timecopy, stime); 1847 if (slp <= 0) { 1848 /* Timed out, but 0 is enough input. */ 1849 splx(s); 1850 return (0); 1851 } 1852 } 1853 } 1854#undef diff 1855 /* 1856 * Rounding down may make us wake up just short 1857 * of the target, so we round up. 1858 * The formula is ceiling(slp * hz/1000000). 1859 * 32-bit arithmetic is enough for hz < 169. 1860 * XXX see tvtohz() for how to avoid overflow if hz 1861 * is large (divide by `tick' and/or arrange to 1862 * use tvtohz() if hz is large). 1863 */ 1864 slp = (long) (((u_long)slp * hz) + 999999) / 1000000; 1865 goto sleep; 1866 } 1867 if (qp->c_cc <= 0) { 1868sleep: 1869 /* 1870 * There is no input, or not enough input and we can block. 1871 */ 1872 error = ttysleep(tp, TSA_HUP_OR_INPUT(tp), TTIPRI | PCATCH, 1873 ISSET(tp->t_state, TS_CONNECTED) ? 1874 "ttyin" : "ttyhup", (int)slp); 1875 splx(s); 1876 if (error == EWOULDBLOCK) 1877 error = 0; 1878 else if (error) 1879 return (error); 1880 /* 1881 * XXX what happens if another process eats some input 1882 * while we are asleep (not just here)? It would be 1883 * safest to detect changes and reset our state variables 1884 * (has_stime and last_cc). 1885 */ 1886 slp = 0; 1887 goto loop; 1888 } 1889read: 1890 splx(s); 1891 /* 1892 * Input present, check for input mapping and processing. 1893 */ 1894 first = 1; 1895 if (ISSET(lflag, ICANON | ISIG)) 1896 goto slowcase; 1897 for (;;) { 1898 char ibuf[IBUFSIZ]; 1899 int icc; 1900 1901 icc = imin(uio->uio_resid, IBUFSIZ); 1902 icc = q_to_b(qp, ibuf, icc); 1903 if (icc <= 0) { 1904 if (first) 1905 goto loop; 1906 break; 1907 } 1908 error = uiomove(ibuf, icc, uio); 1909 /* 1910 * XXX if there was an error then we should ungetc() the 1911 * unmoved chars and reduce icc here. 1912 */ 1913 if (error) 1914 break; 1915 if (uio->uio_resid == 0) 1916 break; 1917 first = 0; 1918 } 1919 goto out; 1920slowcase: 1921 for (;;) { 1922 c = getc(qp); 1923 if (c < 0) { 1924 if (first) 1925 goto loop; 1926 break; 1927 } 1928 /* 1929 * delayed suspend (^Y) 1930 */ 1931 if (CCEQ(cc[VDSUSP], c) && 1932 ISSET(lflag, IEXTEN | ISIG) == (IEXTEN | ISIG)) { 1933 if (tp->t_pgrp != NULL) { 1934 PGRP_LOCK(tp->t_pgrp); 1935 pgsignal(tp->t_pgrp, SIGTSTP, 1); 1936 PGRP_UNLOCK(tp->t_pgrp); 1937 } 1938 if (first) { 1939 error = ttysleep(tp, &lbolt, TTIPRI | PCATCH, 1940 "ttybg3", 0); 1941 if (error) 1942 break; 1943 goto loop; 1944 } 1945 break; 1946 } 1947 /* 1948 * Interpret EOF only in canonical mode. 1949 */ 1950 if (CCEQ(cc[VEOF], c) && ISSET(lflag, ICANON)) 1951 break; 1952 /* 1953 * Give user character. 1954 */ 1955 error = ureadc(c, uio); 1956 if (error) 1957 /* XXX should ungetc(c, qp). */ 1958 break; 1959 if (uio->uio_resid == 0) 1960 break; 1961 /* 1962 * In canonical mode check for a "break character" 1963 * marking the end of a "line of input". 1964 */ 1965 if (ISSET(lflag, ICANON) && TTBREAKC(c, lflag)) 1966 break; 1967 first = 0; 1968 } 1969 1970out: 1971 /* 1972 * Look to unblock input now that (presumably) 1973 * the input queue has gone down. 1974 */ 1975 s = spltty(); 1976 if (ISSET(tp->t_state, TS_TBLOCK) && 1977 tp->t_rawq.c_cc + tp->t_canq.c_cc <= tp->t_ilowat) 1978 ttyunblock(tp); 1979 splx(s); 1980 1981 return (error); 1982} 1983 1984/* 1985 * Check the output queue on tp for space for a kernel message (from uprintf 1986 * or tprintf). Allow some space over the normal hiwater mark so we don't 1987 * lose messages due to normal flow control, but don't let the tty run amok. 1988 * Sleeps here are not interruptible, but we return prematurely if new signals 1989 * arrive. 1990 */ 1991int 1992ttycheckoutq(struct tty *tp, int wait) 1993{ 1994 int hiwat, s; 1995 sigset_t oldmask; 1996 struct thread *td; 1997 struct proc *p; 1998 1999 td = curthread; 2000 p = td->td_proc; 2001 hiwat = tp->t_ohiwat; 2002 SIGEMPTYSET(oldmask); 2003 s = spltty(); 2004 if (wait) { 2005 PROC_LOCK(p); 2006 oldmask = td->td_siglist; 2007 PROC_UNLOCK(p); 2008 } 2009 if (tp->t_outq.c_cc > hiwat + OBUFSIZ + 100) 2010 while (tp->t_outq.c_cc > hiwat) { 2011 ttstart(tp); 2012 if (tp->t_outq.c_cc <= hiwat) 2013 break; 2014 if (!wait) { 2015 splx(s); 2016 return (0); 2017 } 2018 PROC_LOCK(p); 2019 if (!SIGSETEQ(td->td_siglist, oldmask)) { 2020 PROC_UNLOCK(p); 2021 splx(s); 2022 return (0); 2023 } 2024 PROC_UNLOCK(p); 2025 SET(tp->t_state, TS_SO_OLOWAT); 2026 tsleep(TSA_OLOWAT(tp), PZERO - 1, "ttoutq", hz); 2027 } 2028 splx(s); 2029 return (1); 2030} 2031 2032/* 2033 * Process a write call on a tty device. 2034 */ 2035int 2036ttwrite(struct tty *tp, struct uio *uio, int flag) 2037{ 2038 char *cp = NULL; 2039 int cc, ce; 2040 struct thread *td; 2041 struct proc *p; 2042 int i, hiwat, cnt, error, s; 2043 char obuf[OBUFSIZ]; 2044 2045 hiwat = tp->t_ohiwat; 2046 cnt = uio->uio_resid; 2047 error = 0; 2048 cc = 0; 2049 td = curthread; 2050 p = td->td_proc; 2051loop: 2052 s = spltty(); 2053 if (ISSET(tp->t_state, TS_ZOMBIE)) { 2054 splx(s); 2055 if (uio->uio_resid == cnt) 2056 error = EIO; 2057 goto out; 2058 } 2059 if (!ISSET(tp->t_state, TS_CONNECTED)) { 2060 if (flag & IO_NDELAY) { 2061 splx(s); 2062 error = EWOULDBLOCK; 2063 goto out; 2064 } 2065 error = ttysleep(tp, TSA_CARR_ON(tp), TTIPRI | PCATCH, 2066 "ttywdcd", 0); 2067 splx(s); 2068 if (error) 2069 goto out; 2070 goto loop; 2071 } 2072 splx(s); 2073 /* 2074 * Hang the process if it's in the background. 2075 */ 2076 sx_slock(&proctree_lock); 2077 PROC_LOCK(p); 2078 if (isbackground(p, tp) && 2079 ISSET(tp->t_lflag, TOSTOP) && !(p->p_flag & P_PPWAIT) && 2080 !SIGISMEMBER(p->p_sigacts->ps_sigignore, SIGTTOU) && 2081 !SIGISMEMBER(td->td_sigmask, SIGTTOU)) { 2082 if (p->p_pgrp->pg_jobc == 0) { 2083 PROC_UNLOCK(p); 2084 sx_sunlock(&proctree_lock); 2085 error = EIO; 2086 goto out; 2087 } 2088 PROC_UNLOCK(p); 2089 PGRP_LOCK(p->p_pgrp); 2090 sx_sunlock(&proctree_lock); 2091 pgsignal(p->p_pgrp, SIGTTOU, 1); 2092 PGRP_UNLOCK(p->p_pgrp); 2093 error = ttysleep(tp, &lbolt, TTIPRI | PCATCH, "ttybg4", 0); 2094 if (error) 2095 goto out; 2096 goto loop; 2097 } else { 2098 PROC_UNLOCK(p); 2099 sx_sunlock(&proctree_lock); 2100 } 2101 /* 2102 * Process the user's data in at most OBUFSIZ chunks. Perform any 2103 * output translation. Keep track of high water mark, sleep on 2104 * overflow awaiting device aid in acquiring new space. 2105 */ 2106 while (uio->uio_resid > 0 || cc > 0) { 2107 if (ISSET(tp->t_lflag, FLUSHO)) { 2108 uio->uio_resid = 0; 2109 return (0); 2110 } 2111 if (tp->t_outq.c_cc > hiwat) 2112 goto ovhiwat; 2113 /* 2114 * Grab a hunk of data from the user, unless we have some 2115 * leftover from last time. 2116 */ 2117 if (cc == 0) { 2118 cc = imin(uio->uio_resid, OBUFSIZ); 2119 cp = obuf; 2120 error = uiomove(cp, cc, uio); 2121 if (error) { 2122 cc = 0; 2123 break; 2124 } 2125 } 2126 /* 2127 * If nothing fancy need be done, grab those characters we 2128 * can handle without any of ttyoutput's processing and 2129 * just transfer them to the output q. For those chars 2130 * which require special processing (as indicated by the 2131 * bits in char_type), call ttyoutput. After processing 2132 * a hunk of data, look for FLUSHO so ^O's will take effect 2133 * immediately. 2134 */ 2135 while (cc > 0) { 2136 if (!ISSET(tp->t_oflag, OPOST)) 2137 ce = cc; 2138 else { 2139 ce = cc - scanc((u_int)cc, (u_char *)cp, 2140 char_type, CCLASSMASK); 2141 /* 2142 * If ce is zero, then we're processing 2143 * a special character through ttyoutput. 2144 */ 2145 if (ce == 0) { 2146 tp->t_rocount = 0; 2147 if (ttyoutput(*cp, tp) >= 0) { 2148 /* No Clists, wait a bit. */ 2149 ttstart(tp); 2150 if (flag & IO_NDELAY) { 2151 error = EWOULDBLOCK; 2152 goto out; 2153 } 2154 error = ttysleep(tp, &lbolt, 2155 TTOPRI|PCATCH, 2156 "ttybf1", 0); 2157 if (error) 2158 goto out; 2159 goto loop; 2160 } 2161 cp++; 2162 cc--; 2163 if (ISSET(tp->t_lflag, FLUSHO) || 2164 tp->t_outq.c_cc > hiwat) 2165 goto ovhiwat; 2166 continue; 2167 } 2168 } 2169 /* 2170 * A bunch of normal characters have been found. 2171 * Transfer them en masse to the output queue and 2172 * continue processing at the top of the loop. 2173 * If there are any further characters in this 2174 * <= OBUFSIZ chunk, the first should be a character 2175 * requiring special handling by ttyoutput. 2176 */ 2177 tp->t_rocount = 0; 2178 i = b_to_q(cp, ce, &tp->t_outq); 2179 ce -= i; 2180 tp->t_column += ce; 2181 cp += ce, cc -= ce, tk_nout += ce; 2182 tp->t_outcc += ce; 2183 if (i > 0) { 2184 /* No Clists, wait a bit. */ 2185 ttstart(tp); 2186 if (flag & IO_NDELAY) { 2187 error = EWOULDBLOCK; 2188 goto out; 2189 } 2190 error = ttysleep(tp, &lbolt, TTOPRI | PCATCH, 2191 "ttybf2", 0); 2192 if (error) 2193 goto out; 2194 goto loop; 2195 } 2196 if (ISSET(tp->t_lflag, FLUSHO) || 2197 tp->t_outq.c_cc > hiwat) 2198 break; 2199 } 2200 ttstart(tp); 2201 } 2202out: 2203 /* 2204 * If cc is nonzero, we leave the uio structure inconsistent, as the 2205 * offset and iov pointers have moved forward, but it doesn't matter 2206 * (the call will either return short or restart with a new uio). 2207 */ 2208 uio->uio_resid += cc; 2209 return (error); 2210 2211ovhiwat: 2212 ttstart(tp); 2213 s = spltty(); 2214 /* 2215 * This can only occur if FLUSHO is set in t_lflag, 2216 * or if ttstart/oproc is synchronous (or very fast). 2217 */ 2218 if (tp->t_outq.c_cc <= hiwat) { 2219 splx(s); 2220 goto loop; 2221 } 2222 if (flag & IO_NDELAY) { 2223 splx(s); 2224 uio->uio_resid += cc; 2225 return (uio->uio_resid == cnt ? EWOULDBLOCK : 0); 2226 } 2227 SET(tp->t_state, TS_SO_OLOWAT); 2228 error = ttysleep(tp, TSA_OLOWAT(tp), TTOPRI | PCATCH, "ttywri", 2229 tp->t_timeout); 2230 splx(s); 2231 if (error == EWOULDBLOCK) 2232 error = EIO; 2233 if (error) 2234 goto out; 2235 goto loop; 2236} 2237 2238/* 2239 * Rubout one character from the rawq of tp 2240 * as cleanly as possible. 2241 */ 2242static void 2243ttyrub(int c, struct tty *tp) 2244{ 2245 char *cp; 2246 int savecol; 2247 int tabc, s; 2248 2249 if (!ISSET(tp->t_lflag, ECHO) || ISSET(tp->t_lflag, EXTPROC)) 2250 return; 2251 CLR(tp->t_lflag, FLUSHO); 2252 if (ISSET(tp->t_lflag, ECHOE)) { 2253 if (tp->t_rocount == 0) { 2254 /* 2255 * Screwed by ttwrite; retype 2256 */ 2257 ttyretype(tp); 2258 return; 2259 } 2260 if (c == ('\t' | TTY_QUOTE) || c == ('\n' | TTY_QUOTE)) 2261 ttyrubo(tp, 2); 2262 else { 2263 CLR(c, ~TTY_CHARMASK); 2264 switch (CCLASS(c)) { 2265 case ORDINARY: 2266 ttyrubo(tp, 1); 2267 break; 2268 case BACKSPACE: 2269 case CONTROL: 2270 case NEWLINE: 2271 case RETURN: 2272 case VTAB: 2273 if (ISSET(tp->t_lflag, ECHOCTL)) 2274 ttyrubo(tp, 2); 2275 break; 2276 case TAB: 2277 if (tp->t_rocount < tp->t_rawq.c_cc) { 2278 ttyretype(tp); 2279 return; 2280 } 2281 s = spltty(); 2282 savecol = tp->t_column; 2283 SET(tp->t_state, TS_CNTTB); 2284 SET(tp->t_lflag, FLUSHO); 2285 tp->t_column = tp->t_rocol; 2286 cp = tp->t_rawq.c_cf; 2287 if (cp) 2288 tabc = *cp; /* XXX FIX NEXTC */ 2289 for (; cp; cp = nextc(&tp->t_rawq, cp, &tabc)) 2290 ttyecho(tabc, tp); 2291 CLR(tp->t_lflag, FLUSHO); 2292 CLR(tp->t_state, TS_CNTTB); 2293 splx(s); 2294 2295 /* savecol will now be length of the tab. */ 2296 savecol -= tp->t_column; 2297 tp->t_column += savecol; 2298 if (savecol > 8) 2299 savecol = 8; /* overflow screw */ 2300 while (--savecol >= 0) 2301 (void)ttyoutput('\b', tp); 2302 break; 2303 default: /* XXX */ 2304#define PANICSTR "ttyrub: would panic c = %d, val = %d\n" 2305 (void)printf(PANICSTR, c, CCLASS(c)); 2306#ifdef notdef 2307 panic(PANICSTR, c, CCLASS(c)); 2308#endif 2309 } 2310 } 2311 } else if (ISSET(tp->t_lflag, ECHOPRT)) { 2312 if (!ISSET(tp->t_state, TS_ERASE)) { 2313 SET(tp->t_state, TS_ERASE); 2314 (void)ttyoutput('\\', tp); 2315 } 2316 ttyecho(c, tp); 2317 } else { 2318 ttyecho(tp->t_cc[VERASE], tp); 2319 /* 2320 * This code may be executed not only when an ERASE key 2321 * is pressed, but also when ^U (KILL) or ^W (WERASE) are. 2322 * So, I didn't think it was worthwhile to pass the extra 2323 * information (which would need an extra parameter, 2324 * changing every call) needed to distinguish the ERASE2 2325 * case from the ERASE. 2326 */ 2327 } 2328 --tp->t_rocount; 2329} 2330 2331/* 2332 * Back over cnt characters, erasing them. 2333 */ 2334static void 2335ttyrubo(struct tty *tp, int cnt) 2336{ 2337 2338 while (cnt-- > 0) { 2339 (void)ttyoutput('\b', tp); 2340 (void)ttyoutput(' ', tp); 2341 (void)ttyoutput('\b', tp); 2342 } 2343} 2344 2345/* 2346 * ttyretype -- 2347 * Reprint the rawq line. Note, it is assumed that c_cc has already 2348 * been checked. 2349 */ 2350static void 2351ttyretype(struct tty *tp) 2352{ 2353 char *cp; 2354 int s, c; 2355 2356 /* Echo the reprint character. */ 2357 if (tp->t_cc[VREPRINT] != _POSIX_VDISABLE) 2358 ttyecho(tp->t_cc[VREPRINT], tp); 2359 2360 (void)ttyoutput('\n', tp); 2361 2362 /* 2363 * XXX 2364 * FIX: NEXTC IS BROKEN - DOESN'T CHECK QUOTE 2365 * BIT OF FIRST CHAR. 2366 */ 2367 s = spltty(); 2368 for (cp = tp->t_canq.c_cf, c = (cp != NULL ? *cp : 0); 2369 cp != NULL; cp = nextc(&tp->t_canq, cp, &c)) 2370 ttyecho(c, tp); 2371 for (cp = tp->t_rawq.c_cf, c = (cp != NULL ? *cp : 0); 2372 cp != NULL; cp = nextc(&tp->t_rawq, cp, &c)) 2373 ttyecho(c, tp); 2374 CLR(tp->t_state, TS_ERASE); 2375 splx(s); 2376 2377 tp->t_rocount = tp->t_rawq.c_cc; 2378 tp->t_rocol = 0; 2379} 2380 2381/* 2382 * Echo a typed character to the terminal. 2383 */ 2384static void 2385ttyecho(int c, struct tty *tp) 2386{ 2387 2388 if (!ISSET(tp->t_state, TS_CNTTB)) 2389 CLR(tp->t_lflag, FLUSHO); 2390 if ((!ISSET(tp->t_lflag, ECHO) && 2391 (c != '\n' || !ISSET(tp->t_lflag, ECHONL))) || 2392 ISSET(tp->t_lflag, EXTPROC)) 2393 return; 2394 if (ISSET(tp->t_lflag, ECHOCTL) && 2395 ((ISSET(c, TTY_CHARMASK) <= 037 && c != '\t' && c != '\n') || 2396 ISSET(c, TTY_CHARMASK) == 0177)) { 2397 (void)ttyoutput('^', tp); 2398 CLR(c, ~TTY_CHARMASK); 2399 if (c == 0177) 2400 c = '?'; 2401 else 2402 c += 'A' - 1; 2403 } 2404 (void)ttyoutput(c, tp); 2405} 2406 2407/* 2408 * Wake up any readers on a tty. 2409 */ 2410void 2411ttwakeup(struct tty *tp) 2412{ 2413 2414 if (SEL_WAITING(&tp->t_rsel)) 2415 selwakeuppri(&tp->t_rsel, TTIPRI); 2416 if (ISSET(tp->t_state, TS_ASYNC) && tp->t_sigio != NULL) 2417 pgsigio(&tp->t_sigio, SIGIO, (tp->t_session != NULL)); 2418 wakeup(TSA_HUP_OR_INPUT(tp)); 2419 KNOTE_UNLOCKED(&tp->t_rsel.si_note, 0); 2420} 2421 2422/* 2423 * Wake up any writers on a tty. 2424 */ 2425void 2426ttwwakeup(struct tty *tp) 2427{ 2428 2429 if (SEL_WAITING(&tp->t_wsel) && tp->t_outq.c_cc <= tp->t_olowat) 2430 selwakeuppri(&tp->t_wsel, TTOPRI); 2431 if (ISSET(tp->t_state, TS_ASYNC) && tp->t_sigio != NULL) 2432 pgsigio(&tp->t_sigio, SIGIO, (tp->t_session != NULL)); 2433 if (ISSET(tp->t_state, TS_BUSY | TS_SO_OCOMPLETE) == 2434 TS_SO_OCOMPLETE && tp->t_outq.c_cc == 0) { 2435 CLR(tp->t_state, TS_SO_OCOMPLETE); 2436 wakeup(TSA_OCOMPLETE(tp)); 2437 } 2438 if (ISSET(tp->t_state, TS_SO_OLOWAT) && 2439 tp->t_outq.c_cc <= tp->t_olowat) { 2440 CLR(tp->t_state, TS_SO_OLOWAT); 2441 wakeup(TSA_OLOWAT(tp)); 2442 } 2443 KNOTE_UNLOCKED(&tp->t_wsel.si_note, 0); 2444} 2445 2446/* 2447 * Look up a code for a specified speed in a conversion table; 2448 * used by drivers to map software speed values to hardware parameters. 2449 */ 2450int 2451ttspeedtab(int speed, struct speedtab *table) 2452{ 2453 2454 for ( ; table->sp_speed != -1; table++) 2455 if (table->sp_speed == speed) 2456 return (table->sp_code); 2457 return (-1); 2458} 2459 2460/* 2461 * Set input and output watermarks and buffer sizes. For input, the 2462 * high watermark is about one second's worth of input above empty, the 2463 * low watermark is slightly below high water, and the buffer size is a 2464 * driver-dependent amount above high water. For output, the watermarks 2465 * are near the ends of the buffer, with about 1 second's worth of input 2466 * between them. All this only applies to the standard line discipline. 2467 */ 2468void 2469ttsetwater(struct tty *tp) 2470{ 2471 int cps, ttmaxhiwat, x; 2472 2473 /* Input. */ 2474 clist_alloc_cblocks(&tp->t_canq, TTYHOG, 512); 2475 switch (tp->t_ispeedwat) { 2476 case (speed_t)-1: 2477 cps = tp->t_ispeed / 10; 2478 break; 2479 case 0: 2480 /* 2481 * This case is for old drivers that don't know about 2482 * t_ispeedwat. Arrange for them to get the old buffer 2483 * sizes and watermarks. 2484 */ 2485 cps = TTYHOG - 2 * 256; 2486 tp->t_ififosize = 2 * 256; 2487 break; 2488 default: 2489 cps = tp->t_ispeedwat / 10; 2490 break; 2491 } 2492 tp->t_ihiwat = cps; 2493 tp->t_ilowat = 7 * cps / 8; 2494 x = cps + tp->t_ififosize; 2495 clist_alloc_cblocks(&tp->t_rawq, x, x); 2496 2497 /* Output. */ 2498 switch (tp->t_ospeedwat) { 2499 case (speed_t)-1: 2500 cps = tp->t_ospeed / 10; 2501 ttmaxhiwat = 2 * TTMAXHIWAT; 2502 break; 2503 case 0: 2504 cps = tp->t_ospeed / 10; 2505 ttmaxhiwat = TTMAXHIWAT; 2506 break; 2507 default: 2508 cps = tp->t_ospeedwat / 10; 2509 ttmaxhiwat = 8 * TTMAXHIWAT; 2510 break; 2511 } 2512#define CLAMP(x, h, l) ((x) > h ? h : ((x) < l) ? l : (x)) 2513 tp->t_olowat = x = CLAMP(cps / 2, TTMAXLOWAT, TTMINLOWAT); 2514 x += cps; 2515 x = CLAMP(x, ttmaxhiwat, TTMINHIWAT); /* XXX clamps are too magic */ 2516 tp->t_ohiwat = roundup(x, CBSIZE); /* XXX for compat */ 2517 x = imax(tp->t_ohiwat, TTMAXHIWAT); /* XXX for compat/safety */ 2518 x += OBUFSIZ + 100; 2519 clist_alloc_cblocks(&tp->t_outq, x, x); 2520#undef CLAMP 2521} 2522 2523/* 2524 * Report on state of foreground process group. 2525 */ 2526void 2527ttyinfo(struct tty *tp) 2528{ 2529 struct timeval utime, stime; 2530 struct proc *p, *pick; 2531 struct thread *td; 2532 const char *stateprefix, *state; 2533 long rss; 2534 int load, pctcpu; 2535 2536 if (ttycheckoutq(tp,0) == 0) 2537 return; 2538 2539 /* Print load average. */ 2540 load = (averunnable.ldavg[0] * 100 + FSCALE / 2) >> FSHIFT; 2541 ttyprintf(tp, "load: %d.%02d ", load / 100, load % 100); 2542 2543 /* 2544 * On return following a ttyprintf(), we set tp->t_rocount to 0 so 2545 * that pending input will be retyped on BS. 2546 */ 2547 if (tp->t_session == NULL) { 2548 ttyprintf(tp, "not a controlling terminal\n"); 2549 tp->t_rocount = 0; 2550 return; 2551 } 2552 if (tp->t_pgrp == NULL) { 2553 ttyprintf(tp, "no foreground process group\n"); 2554 tp->t_rocount = 0; 2555 return; 2556 } 2557 sx_slock(&proctree_lock); 2558 if ((p = LIST_FIRST(&tp->t_pgrp->pg_members)) == NULL) { 2559 sx_sunlock(&proctree_lock); 2560 ttyprintf(tp, "empty foreground process group\n"); 2561 tp->t_rocount = 0; 2562 return; 2563 } 2564 2565 /* 2566 * Pick the most interesting process and copy some of its 2567 * state for printing later. sched_lock must be held for 2568 * most parts of this. Holding it throughout is simplest 2569 * and prevents even unimportant inconsistencies in the 2570 * copy of the state, but may increase interrupt latency 2571 * too much. 2572 */ 2573 mtx_lock_spin(&sched_lock); 2574 for (pick = NULL; p != NULL; p = LIST_NEXT(p, p_pglist)) 2575 if (proc_compare(pick, p)) 2576 pick = p; 2577 2578 td = FIRST_THREAD_IN_PROC(pick); /* XXXKSE */ 2579#if 0 2580 KASSERT(td != NULL, ("ttyinfo: no thread")); 2581#else 2582 if (td == NULL) { 2583 mtx_unlock_spin(&sched_lock); 2584 sx_sunlock(&proctree_lock); 2585 ttyprintf(tp, "foreground process without thread\n"); 2586 tp->t_rocount = 0; 2587 return; 2588 } 2589#endif 2590 stateprefix = ""; 2591 if (TD_IS_RUNNING(td)) 2592 state = "running"; 2593 else if (TD_ON_RUNQ(td) || TD_CAN_RUN(td)) 2594 state = "runnable"; 2595 else if (TD_IS_SLEEPING(td)) { 2596 /* XXX: If we're sleeping, are we ever not in a queue? */ 2597 if (TD_ON_SLEEPQ(td)) 2598 state = td->td_wmesg; 2599 else 2600 state = "sleeping without queue"; 2601 } else if (TD_ON_LOCK(td)) { 2602 state = td->td_lockname; 2603 stateprefix = "*"; 2604 } else if (TD_IS_SUSPENDED(td)) 2605 state = "suspended"; 2606 else if (TD_AWAITING_INTR(td)) 2607 state = "intrwait"; 2608 else 2609 state = "unknown"; 2610 pctcpu = (sched_pctcpu(td) * 10000 + FSCALE / 2) >> FSHIFT; 2611 if (pick->p_state == PRS_NEW || pick->p_state == PRS_ZOMBIE) 2612 rss = 0; 2613 else 2614 rss = pgtok(vmspace_resident_count(pick->p_vmspace)); 2615 mtx_unlock_spin(&sched_lock); 2616 PROC_LOCK(pick); 2617 calcru(pick, &utime, &stime); 2618 PROC_UNLOCK(pick); 2619 2620 /* Print command, pid, state, utime, stime, %cpu, and rss. */ 2621 ttyprintf(tp, 2622 " cmd: %s %d [%s%s] %ld.%02ldu %ld.%02lds %d%% %ldk\n", 2623 pick->p_comm, pick->p_pid, stateprefix, state, 2624 (long)utime.tv_sec, utime.tv_usec / 10000, 2625 (long)stime.tv_sec, stime.tv_usec / 10000, 2626 pctcpu / 100, rss); 2627 tp->t_rocount = 0; 2628 sx_sunlock(&proctree_lock); 2629} 2630 2631/* 2632 * Returns 1 if p2 is "better" than p1 2633 * 2634 * The algorithm for picking the "interesting" process is thus: 2635 * 2636 * 1) Only foreground processes are eligible - implied. 2637 * 2) Runnable processes are favored over anything else. The runner 2638 * with the highest cpu utilization is picked (p_estcpu). Ties are 2639 * broken by picking the highest pid. 2640 * 3) The sleeper with the shortest sleep time is next. With ties, 2641 * we pick out just "short-term" sleepers (P_SINTR == 0). 2642 * 4) Further ties are broken by picking the highest pid. 2643 */ 2644#define ISRUN(p, val) \ 2645do { \ 2646 struct thread *td; \ 2647 val = 0; \ 2648 FOREACH_THREAD_IN_PROC(p, td) { \ 2649 if (TD_ON_RUNQ(td) || \ 2650 TD_IS_RUNNING(td)) { \ 2651 val = 1; \ 2652 break; \ 2653 } \ 2654 } \ 2655} while (0) 2656 2657#define TESTAB(a, b) ((a)<<1 | (b)) 2658#define ONLYA 2 2659#define ONLYB 1 2660#define BOTH 3 2661 2662static int 2663proc_compare(struct proc *p1, struct proc *p2) 2664{ 2665 2666 int esta, estb; 2667 struct ksegrp *kg; 2668 mtx_assert(&sched_lock, MA_OWNED); 2669 if (p1 == NULL) 2670 return (1); 2671 2672 ISRUN(p1, esta); 2673 ISRUN(p2, estb); 2674 2675 /* 2676 * see if at least one of them is runnable 2677 */ 2678 switch (TESTAB(esta, estb)) { 2679 case ONLYA: 2680 return (0); 2681 case ONLYB: 2682 return (1); 2683 case BOTH: 2684 /* 2685 * tie - favor one with highest recent cpu utilization 2686 */ 2687 esta = estb = 0; 2688 FOREACH_KSEGRP_IN_PROC(p1,kg) { 2689 esta += kg->kg_estcpu; 2690 } 2691 FOREACH_KSEGRP_IN_PROC(p2,kg) { 2692 estb += kg->kg_estcpu; 2693 } 2694 if (estb > esta) 2695 return (1); 2696 if (esta > estb) 2697 return (0); 2698 return (p2->p_pid > p1->p_pid); /* tie - return highest pid */ 2699 } 2700 /* 2701 * weed out zombies 2702 */ 2703 switch (TESTAB(p1->p_state == PRS_ZOMBIE, p2->p_state == PRS_ZOMBIE)) { 2704 case ONLYA: 2705 return (1); 2706 case ONLYB: 2707 return (0); 2708 case BOTH: 2709 return (p2->p_pid > p1->p_pid); /* tie - return highest pid */ 2710 } 2711 2712#if 0 /* XXXKSE */ 2713 /* 2714 * pick the one with the smallest sleep time 2715 */ 2716 if (p2->p_slptime > p1->p_slptime) 2717 return (0); 2718 if (p1->p_slptime > p2->p_slptime) 2719 return (1); 2720 /* 2721 * favor one sleeping in a non-interruptible sleep 2722 */ 2723 if (p1->p_sflag & PS_SINTR && (p2->p_sflag & PS_SINTR) == 0) 2724 return (1); 2725 if (p2->p_sflag & PS_SINTR && (p1->p_sflag & PS_SINTR) == 0) 2726 return (0); 2727#endif 2728 return (p2->p_pid > p1->p_pid); /* tie - return highest pid */ 2729} 2730 2731/* 2732 * Output char to tty; console putchar style. 2733 */ 2734int 2735tputchar(int c, struct tty *tp) 2736{ 2737 int s; 2738 2739 s = spltty(); 2740 if (!ISSET(tp->t_state, TS_CONNECTED)) { 2741 splx(s); 2742 return (-1); 2743 } 2744 if (c == '\n') 2745 (void)ttyoutput('\r', tp); 2746 (void)ttyoutput(c, tp); 2747 ttstart(tp); 2748 splx(s); 2749 return (0); 2750} 2751 2752/* 2753 * Sleep on chan, returning ERESTART if tty changed while we napped and 2754 * returning any errors (e.g. EINTR/EWOULDBLOCK) reported by tsleep. If 2755 * the tty is revoked, restarting a pending call will redo validation done 2756 * at the start of the call. 2757 */ 2758int 2759ttysleep(struct tty *tp, void *chan, int pri, char *wmesg, int timo) 2760{ 2761 int error; 2762 int gen; 2763 2764 gen = tp->t_gen; 2765 error = tsleep(chan, pri, wmesg, timo); 2766 if (tp->t_state & TS_GONE) 2767 return (ENXIO); 2768 if (error) 2769 return (error); 2770 return (tp->t_gen == gen ? 0 : ERESTART); 2771} 2772 2773/* 2774 * Gain a reference to a TTY 2775 */ 2776int 2777ttyref(struct tty *tp) 2778{ 2779 int i; 2780 2781 mtx_lock(&tp->t_mtx); 2782 KASSERT(tp->t_refcnt > 0, 2783 ("ttyref(): tty refcnt is %d (%s)", 2784 tp->t_refcnt, tp->t_dev != NULL ? devtoname(tp->t_dev) : "??")); 2785 i = ++tp->t_refcnt; 2786 mtx_unlock(&tp->t_mtx); 2787 return (i); 2788} 2789 2790/* 2791 * Drop a reference to a TTY. 2792 * When reference count drops to zero, we free it. 2793 */ 2794int 2795ttyrel(struct tty *tp) 2796{ 2797 int i; 2798 2799 mtx_lock(&tty_list_mutex); 2800 mtx_lock(&tp->t_mtx); 2801 KASSERT(tp->t_refcnt > 0, 2802 ("ttyrel(): tty refcnt is %d (%s)", 2803 tp->t_refcnt, tp->t_dev != NULL ? devtoname(tp->t_dev) : "??")); 2804 i = --tp->t_refcnt; 2805 if (i != 0) { 2806 mtx_unlock(&tp->t_mtx); 2807 mtx_unlock(&tty_list_mutex); 2808 return (i); 2809 } 2810 TAILQ_REMOVE(&tty_list, tp, t_list); 2811 mtx_unlock(&tp->t_mtx); 2812 mtx_unlock(&tty_list_mutex); 2813 knlist_destroy(&tp->t_rsel.si_note); 2814 knlist_destroy(&tp->t_wsel.si_note); 2815 mtx_destroy(&tp->t_mtx); 2816 free(tp, M_TTYS); 2817 return (i); 2818} 2819 2820/* 2821 * Allocate a tty struct. Clists in the struct will be allocated by 2822 * tty_open(). 2823 */ 2824struct tty * 2825ttymalloc(struct tty *tp) 2826{ 2827 static int once; 2828 2829 if (!once) { 2830 mtx_init(&tty_list_mutex, "ttylist", NULL, MTX_DEF); 2831 once++; 2832 } 2833 2834 if (tp) { 2835 /* 2836 * XXX: Either this argument should go away, or we should 2837 * XXX: require it and do a ttyrel(tp) here and allocate 2838 * XXX: a new tty. For now do nothing. 2839 */ 2840 return(tp); 2841 } 2842 tp = malloc(sizeof *tp, M_TTYS, M_WAITOK | M_ZERO); 2843 mtx_init(&tp->t_mtx, "tty", NULL, MTX_DEF); 2844 2845 /* 2846 * Set up the initial state 2847 */ 2848 tp->t_refcnt = 1; 2849 tp->t_timeout = -1; 2850 tp->t_dtr_wait = 3 * hz; 2851 2852 ttyinitmode(tp, 0, 0); 2853 bcopy(ttydefchars, tp->t_init_in.c_cc, sizeof tp->t_init_in.c_cc); 2854 2855 /* Make callout the same as callin */ 2856 tp->t_init_out = tp->t_init_in; 2857 2858 mtx_lock(&tty_list_mutex); 2859 TAILQ_INSERT_TAIL(&tty_list, tp, t_list); 2860 mtx_unlock(&tty_list_mutex); 2861 knlist_init(&tp->t_rsel.si_note, &tp->t_mtx); 2862 knlist_init(&tp->t_wsel.si_note, &tp->t_mtx); 2863 return (tp); 2864} 2865 2866struct tty * 2867ttyalloc() 2868{ 2869 2870 return (ttymalloc(NULL)); 2871} 2872 2873static void 2874ttypurge(struct cdev *dev) 2875{ 2876 2877 if (dev->si_tty == NULL) 2878 return; 2879 ttygone(dev->si_tty); 2880} 2881 2882/* 2883 * ttycreate() 2884 * 2885 * Create the device entries for this tty thereby opening it for business. 2886 * 2887 * The flags argument controls if "cua" units are created. 2888 * 2889 * The t_sc filed is copied to si_drv1 in the created cdevs. This 2890 * is particularly important for ->t_cioctl() users. 2891 * 2892 * XXX: implement the init and lock devices by cloning. 2893 */ 2894 2895int 2896ttycreate(struct tty *tp, struct cdevsw *csw, int unit, int flags, const char *fmt, ...) 2897{ 2898 char namebuf[SPECNAMELEN - 3]; /* XXX space for "tty" */ 2899 va_list ap; 2900 struct cdev *cp; 2901 int i, minor, sminor, sunit; 2902 2903 mtx_assert(&Giant, MA_OWNED); 2904 2905 if (tty_unit == NULL) 2906 tty_unit = new_unrhdr(0, 0xffff); 2907 2908 sunit = alloc_unr(tty_unit); 2909 tp->t_devunit = sunit; 2910 2911 if (csw == NULL) { 2912 csw = &tty_cdevsw; 2913 unit = sunit; 2914 } 2915 KASSERT(csw->d_purge == NULL || csw->d_purge == ttypurge, 2916 ("tty should not have d_purge")); 2917 2918 csw->d_purge = ttypurge; 2919 2920 minor = unit2minor(unit); 2921 sminor = unit2minor(sunit); 2922 va_start(ap, fmt); 2923 i = vsnrprintf(namebuf, sizeof namebuf, 32, fmt, ap); 2924 va_end(ap); 2925 KASSERT(i < sizeof namebuf, ("Too long tty name (%s)", namebuf)); 2926 2927 cp = make_dev(csw, minor, 2928 UID_ROOT, GID_WHEEL, 0600, "tty%s", namebuf); 2929 tp->t_dev = cp; 2930 tp->t_mdev = cp; 2931 cp->si_tty = tp; 2932 cp->si_drv1 = tp->t_sc; 2933 2934 cp = make_dev(&ttys_cdevsw, sminor | MINOR_INIT, 2935 UID_ROOT, GID_WHEEL, 0600, "tty%s.init", namebuf); 2936 dev_depends(tp->t_dev, cp); 2937 cp->si_drv1 = tp->t_sc; 2938 cp->si_drv2 = &tp->t_init_in; 2939 cp->si_tty = tp; 2940 2941 cp = make_dev(&ttys_cdevsw, sminor | MINOR_LOCK, 2942 UID_ROOT, GID_WHEEL, 0600, "tty%s.lock", namebuf); 2943 dev_depends(tp->t_dev, cp); 2944 cp->si_drv1 = tp->t_sc; 2945 cp->si_drv2 = &tp->t_lock_in; 2946 cp->si_tty = tp; 2947 2948 if (flags & MINOR_CALLOUT) { 2949 cp = make_dev(csw, minor | MINOR_CALLOUT, 2950 UID_UUCP, GID_DIALER, 0660, "cua%s", namebuf); 2951 dev_depends(tp->t_dev, cp); 2952 cp->si_drv1 = tp->t_sc; 2953 cp->si_tty = tp; 2954 2955 cp = make_dev(&ttys_cdevsw, sminor | MINOR_CALLOUT | MINOR_INIT, 2956 UID_UUCP, GID_DIALER, 0660, "cua%s.init", namebuf); 2957 dev_depends(tp->t_dev, cp); 2958 cp->si_drv1 = tp->t_sc; 2959 cp->si_drv2 = &tp->t_init_out; 2960 cp->si_tty = tp; 2961 2962 cp = make_dev(&ttys_cdevsw, sminor | MINOR_CALLOUT | MINOR_LOCK, 2963 UID_UUCP, GID_DIALER, 0660, "cua%s.lock", namebuf); 2964 dev_depends(tp->t_dev, cp); 2965 cp->si_drv1 = tp->t_sc; 2966 cp->si_drv2 = &tp->t_lock_out; 2967 cp->si_tty = tp; 2968 } 2969 2970 return (0); 2971} 2972 2973/* 2974 * This function is called when the hardware disappears. We set a flag 2975 * and wake up stuff so all sleeping threads will notice. 2976 */ 2977void 2978ttygone(struct tty *tp) 2979{ 2980 2981 tp->t_state |= TS_GONE; 2982 wakeup(&tp->t_dtr_wait); 2983 wakeup(TSA_CARR_ON(tp)); 2984 wakeup(TSA_HUP_OR_INPUT(tp)); 2985 wakeup(TSA_OCOMPLETE(tp)); 2986 wakeup(TSA_OLOWAT(tp)); 2987 if (tp->t_purge != NULL) 2988 tp->t_purge(tp); 2989} 2990 2991/* 2992 * ttyfree() 2993 * 2994 * Called when the driver is ready to free the tty structure. 2995 * 2996 * XXX: This shall sleep until all threads have left the driver. 2997 */ 2998 2999void 3000ttyfree(struct tty *tp) 3001{ 3002 u_int unit; 3003 3004 mtx_assert(&Giant, MA_OWNED); 3005 ttygone(tp); 3006 unit = tp->t_devunit; 3007 destroy_dev(tp->t_mdev); 3008 free_unr(tty_unit, unit); 3009} 3010 3011static int 3012sysctl_kern_ttys(SYSCTL_HANDLER_ARGS) 3013{ 3014 struct tty *tp, *tp2; 3015 struct xtty xt; 3016 int error; 3017 3018 error = 0; 3019 mtx_lock(&tty_list_mutex); 3020 tp = TAILQ_FIRST(&tty_list); 3021 if (tp != NULL) 3022 ttyref(tp); 3023 mtx_unlock(&tty_list_mutex); 3024 while (tp != NULL) { 3025 bzero(&xt, sizeof xt); 3026 xt.xt_size = sizeof xt; 3027#define XT_COPY(field) xt.xt_##field = tp->t_##field 3028 xt.xt_rawcc = tp->t_rawq.c_cc; 3029 xt.xt_cancc = tp->t_canq.c_cc; 3030 xt.xt_outcc = tp->t_outq.c_cc; 3031 XT_COPY(line); 3032 if (tp->t_dev != NULL) 3033 xt.xt_dev = dev2udev(tp->t_dev); 3034 XT_COPY(state); 3035 XT_COPY(flags); 3036 XT_COPY(timeout); 3037 if (tp->t_pgrp != NULL) 3038 xt.xt_pgid = tp->t_pgrp->pg_id; 3039 if (tp->t_session != NULL) 3040 xt.xt_sid = tp->t_session->s_sid; 3041 XT_COPY(termios); 3042 XT_COPY(winsize); 3043 XT_COPY(column); 3044 XT_COPY(rocount); 3045 XT_COPY(rocol); 3046 XT_COPY(ififosize); 3047 XT_COPY(ihiwat); 3048 XT_COPY(ilowat); 3049 XT_COPY(ispeedwat); 3050 XT_COPY(ohiwat); 3051 XT_COPY(olowat); 3052 XT_COPY(ospeedwat); 3053#undef XT_COPY 3054 error = SYSCTL_OUT(req, &xt, sizeof xt); 3055 if (error != 0) { 3056 ttyrel(tp); 3057 return (error); 3058 } 3059 mtx_lock(&tty_list_mutex); 3060 tp2 = TAILQ_NEXT(tp, t_list); 3061 if (tp2 != NULL) 3062 ttyref(tp2); 3063 mtx_unlock(&tty_list_mutex); 3064 ttyrel(tp); 3065 tp = tp2; 3066 } 3067 return (0); 3068} 3069 3070SYSCTL_PROC(_kern, OID_AUTO, ttys, CTLTYPE_OPAQUE|CTLFLAG_RD, 3071 0, 0, sysctl_kern_ttys, "S,xtty", "All ttys"); 3072SYSCTL_LONG(_kern, OID_AUTO, tty_nin, CTLFLAG_RD, 3073 &tk_nin, 0, "Total TTY in characters"); 3074SYSCTL_LONG(_kern, OID_AUTO, tty_nout, CTLFLAG_RD, 3075 &tk_nout, 0, "Total TTY out characters"); 3076 3077void 3078nottystop(struct tty *tp, int rw) 3079{ 3080 3081 return; 3082} 3083 3084int 3085ttyopen(struct cdev *dev, int flag, int mode, struct thread *td) 3086{ 3087 int error; 3088 int s; 3089 struct tty *tp; 3090 3091 tp = dev->si_tty; 3092 s = spltty(); 3093 /* 3094 * We jump to this label after all non-interrupted sleeps to pick 3095 * up any changes of the device state. 3096 */ 3097open_top: 3098 if (tp->t_state & TS_GONE) 3099 return (ENXIO); 3100 error = ttydtrwaitsleep(tp); 3101 if (error) 3102 goto out; 3103 if (tp->t_state & TS_ISOPEN) { 3104 /* 3105 * The device is open, so everything has been initialized. 3106 * Handle conflicts. 3107 */ 3108 if (ISCALLOUT(dev) && !tp->t_actout) 3109 return (EBUSY); 3110 if (tp->t_actout && !ISCALLOUT(dev)) { 3111 if (flag & O_NONBLOCK) 3112 return (EBUSY); 3113 error = tsleep(&tp->t_actout, 3114 TTIPRI | PCATCH, "siobi", 0); 3115 if (error != 0 || (tp->t_flags & TS_GONE)) 3116 goto out; 3117 goto open_top; 3118 } 3119 if (tp->t_state & TS_XCLUDE && suser(td)) 3120 return (EBUSY); 3121 } else { 3122 /* 3123 * The device isn't open, so there are no conflicts. 3124 * Initialize it. Initialization is done twice in many 3125 * cases: to preempt sleeping callin opens if we are 3126 * callout, and to complete a callin open after DCD rises. 3127 */ 3128 tp->t_termios = ISCALLOUT(dev) ? tp->t_init_out : tp->t_init_in; 3129 tp->t_cflag = tp->t_termios.c_cflag; 3130 tp->t_modem(tp, SER_DTR | SER_RTS, 0); 3131 ++tp->t_wopeners; 3132 error = tp->t_param(tp, &tp->t_termios); 3133 --tp->t_wopeners; 3134 if (error == 0 && tp->t_open != NULL) 3135 error = tp->t_open(tp, dev); 3136 if (error != 0) 3137 goto out; 3138 if (ISCALLOUT(dev) || (tp->t_modem(tp, 0, 0) & SER_DCD)) 3139 ttyld_modem(tp, 1); 3140 } 3141 /* 3142 * Wait for DCD if necessary. 3143 */ 3144 if (!(tp->t_state & TS_CARR_ON) && !ISCALLOUT(dev) 3145 && !(tp->t_cflag & CLOCAL) && !(flag & O_NONBLOCK)) { 3146 ++tp->t_wopeners; 3147 error = tsleep(TSA_CARR_ON(tp), TTIPRI | PCATCH, "ttydcd", 0); 3148 --tp->t_wopeners; 3149 if (error != 0 || (tp->t_state & TS_GONE)) 3150 goto out; 3151 goto open_top; 3152 } 3153 error = ttyld_open(tp, dev); 3154 ttyldoptim(tp); 3155 if (tp->t_state & TS_ISOPEN && ISCALLOUT(dev)) 3156 tp->t_actout = TRUE; 3157out: 3158 splx(s); 3159 if (!(tp->t_state & TS_ISOPEN) && tp->t_wopeners == 0 && 3160 tp->t_close != NULL) 3161 tp->t_close(tp); 3162 return (error); 3163} 3164 3165int 3166ttyclose(struct cdev *dev, int flag, int mode, struct thread *td) 3167{ 3168 struct tty *tp; 3169 3170 tp = dev->si_tty; 3171 ttyld_close(tp, flag); 3172 ttyldoptim(tp); 3173 if (tp->t_close != NULL) 3174 tp->t_close(tp); 3175 tty_close(tp); 3176 tp->t_do_timestamp = 0; 3177 if (tp->t_pps != NULL) 3178 tp->t_pps->ppsparam.mode = 0; 3179 return (0); 3180} 3181 3182int 3183ttyread(struct cdev *dev, struct uio *uio, int flag) 3184{ 3185 struct tty *tp; 3186 3187 tp = tty_gettp(dev); 3188 3189 if (tp->t_state & TS_GONE) 3190 return (ENODEV); 3191 return (ttyld_read(tp, uio, flag)); 3192} 3193 3194int 3195ttywrite(struct cdev *dev, struct uio *uio, int flag) 3196{ 3197 struct tty *tp; 3198 3199 tp = tty_gettp(dev); 3200 3201 if (tp->t_state & TS_GONE) 3202 return (ENODEV); 3203 return (ttyld_write(tp, uio, flag)); 3204} 3205 3206int 3207ttyioctl(struct cdev *dev, u_long cmd, caddr_t data, int flag, struct thread *td) 3208{ 3209 struct tty *tp; 3210 int error; 3211 3212 tp = dev->si_tty; 3213 3214 if (cmd == TIOCSETA || cmd == TIOCSETAW || cmd == TIOCSETAF) { 3215 int cc; 3216 struct termios *dt = (struct termios *)data; 3217 struct termios *lt = 3218 ISCALLOUT(dev) ? &tp->t_lock_out : &tp->t_lock_in; 3219 3220 dt->c_iflag = (tp->t_iflag & lt->c_iflag) 3221 | (dt->c_iflag & ~lt->c_iflag); 3222 dt->c_oflag = (tp->t_oflag & lt->c_oflag) 3223 | (dt->c_oflag & ~lt->c_oflag); 3224 dt->c_cflag = (tp->t_cflag & lt->c_cflag) 3225 | (dt->c_cflag & ~lt->c_cflag); 3226 dt->c_lflag = (tp->t_lflag & lt->c_lflag) 3227 | (dt->c_lflag & ~lt->c_lflag); 3228 for (cc = 0; cc < NCCS; ++cc) 3229 if (lt->c_cc[cc] != 0) 3230 dt->c_cc[cc] = tp->t_cc[cc]; 3231 if (lt->c_ispeed != 0) 3232 dt->c_ispeed = tp->t_ispeed; 3233 if (lt->c_ospeed != 0) 3234 dt->c_ospeed = tp->t_ospeed; 3235 } 3236 3237 error = ttyld_ioctl(tp, cmd, data, flag, td); 3238 if (error == ENOIOCTL) 3239 error = ttioctl(tp, cmd, data, flag); 3240 ttyldoptim(tp); 3241 if (error != ENOIOCTL) 3242 return (error); 3243 return (ENOTTY); 3244} 3245 3246void 3247ttyldoptim(struct tty *tp) 3248{ 3249 struct termios *t; 3250 3251 t = &tp->t_termios; 3252 if (!(t->c_iflag & (ICRNL | IGNCR | IMAXBEL | INLCR | ISTRIP | IXON)) 3253 && (!(t->c_iflag & BRKINT) || (t->c_iflag & IGNBRK)) 3254 && (!(t->c_iflag & PARMRK) 3255 || (t->c_iflag & (IGNPAR | IGNBRK)) == (IGNPAR | IGNBRK)) 3256 && !(t->c_lflag & (ECHO | ICANON | IEXTEN | ISIG | PENDIN)) 3257 && linesw[tp->t_line]->l_rint == ttyinput) 3258 tp->t_state |= TS_CAN_BYPASS_L_RINT; 3259 else 3260 tp->t_state &= ~TS_CAN_BYPASS_L_RINT; 3261} 3262 3263static void 3264ttydtrwaitwakeup(void *arg) 3265{ 3266 struct tty *tp; 3267 3268 tp = arg; 3269 tp->t_state &= ~TS_DTR_WAIT; 3270 wakeup(&tp->t_dtr_wait); 3271} 3272 3273 3274void 3275ttydtrwaitstart(struct tty *tp) 3276{ 3277 3278 if (tp->t_dtr_wait == 0) 3279 return; 3280 if (tp->t_state & TS_DTR_WAIT) 3281 return; 3282 timeout(ttydtrwaitwakeup, tp, tp->t_dtr_wait); 3283 tp->t_state |= TS_DTR_WAIT; 3284} 3285 3286int 3287ttydtrwaitsleep(struct tty *tp) 3288{ 3289 int error; 3290 3291 error = 0; 3292 while (error == 0) { 3293 if (tp->t_state & TS_GONE) 3294 error = ENXIO; 3295 else if (!(tp->t_state & TS_DTR_WAIT)) 3296 break; 3297 else 3298 error = tsleep(&tp->t_dtr_wait, TTIPRI | PCATCH, 3299 "dtrwait", 0); 3300 } 3301 return (error); 3302} 3303 3304static int 3305ttysopen(struct cdev *dev, int flag, int mode, struct thread *td) 3306{ 3307 struct tty *tp; 3308 3309 tp = dev->si_tty; 3310 KASSERT(tp != NULL, 3311 ("ttysopen(): no tty pointer on device (%s)", devtoname(dev))); 3312 if (tp->t_state & TS_GONE) 3313 return (ENODEV); 3314 return (0); 3315} 3316 3317static int 3318ttysclose(struct cdev *dev, int flag, int mode, struct thread *td) 3319{ 3320 3321 return (0); 3322} 3323 3324static int 3325ttysrdwr(struct cdev *dev, struct uio *uio, int flag) 3326{ 3327 3328 return (ENODEV); 3329} 3330 3331static int 3332ttysioctl(struct cdev *dev, u_long cmd, caddr_t data, int flag, struct thread *td) 3333{ 3334 struct tty *tp; 3335 int error; 3336 struct termios *ct; 3337 3338 tp = dev->si_tty; 3339 KASSERT(tp != NULL, 3340 ("ttysopen(): no tty pointer on device (%s)", devtoname(dev))); 3341 if (tp->t_state & TS_GONE) 3342 return (ENODEV); 3343 ct = dev->si_drv2; 3344 switch (cmd) { 3345 case TIOCSETA: 3346 error = suser(td); 3347 if (error != 0) 3348 return (error); 3349 *ct = *(struct termios *)data; 3350 return (0); 3351 case TIOCGETA: 3352 *(struct termios *)data = *ct; 3353 return (0); 3354 case TIOCGETD: 3355 *(int *)data = TTYDISC; 3356 return (0); 3357 case TIOCGWINSZ: 3358 bzero(data, sizeof(struct winsize)); 3359 return (0); 3360 default: 3361 if (tp->t_cioctl != NULL) 3362 return(tp->t_cioctl(dev, cmd, data, flag, td)); 3363 return (ENOTTY); 3364 } 3365} 3366 3367/* 3368 * Initialize a tty to sane modes. 3369 */ 3370void 3371ttyinitmode(struct tty *tp, int echo, int speed) 3372{ 3373 3374 if (speed == 0) 3375 speed = TTYDEF_SPEED; 3376 tp->t_init_in.c_iflag = TTYDEF_IFLAG; 3377 tp->t_init_in.c_oflag = TTYDEF_OFLAG; 3378 tp->t_init_in.c_cflag = TTYDEF_CFLAG; 3379 if (echo) 3380 tp->t_init_in.c_lflag = TTYDEF_LFLAG_ECHO; 3381 else 3382 tp->t_init_in.c_lflag = TTYDEF_LFLAG_NOECHO; 3383 3384 tp->t_init_in.c_ispeed = tp->t_init_in.c_ospeed = speed; 3385 termioschars(&tp->t_init_in); 3386 tp->t_init_out = tp->t_init_in; 3387 tp->t_termios = tp->t_init_in; 3388} 3389 3390/* 3391 * Use more "normal" termios paramters for consoles. 3392 */ 3393void 3394ttyconsolemode(struct tty *tp, int speed) 3395{ 3396 3397 if (speed == 0) 3398 speed = TTYDEF_SPEED; 3399 ttyinitmode(tp, 1, speed); 3400 tp->t_init_in.c_cflag |= CLOCAL; 3401 tp->t_lock_out.c_cflag = tp->t_lock_in.c_cflag = CLOCAL; 3402 tp->t_lock_out.c_ispeed = tp->t_lock_out.c_ospeed = 3403 tp->t_lock_in.c_ispeed = tp->t_lock_in.c_ospeed = speed; 3404 tp->t_init_out = tp->t_init_in; 3405 tp->t_termios = tp->t_init_in; 3406} 3407 3408/* 3409 * Record the relationship between the serial ports notion of modem control 3410 * signals and the one used in certain ioctls in a way the compiler can enforce 3411 * XXX: We should define TIOCM_* in terms of SER_ if we can limit the 3412 * XXX: consequences of the #include work that would take. 3413 */ 3414CTASSERT(SER_DTR == TIOCM_DTR / 2); 3415CTASSERT(SER_RTS == TIOCM_RTS / 2); 3416CTASSERT(SER_STX == TIOCM_ST / 2); 3417CTASSERT(SER_SRX == TIOCM_SR / 2); 3418CTASSERT(SER_CTS == TIOCM_CTS / 2); 3419CTASSERT(SER_DCD == TIOCM_DCD / 2); 3420CTASSERT(SER_RI == TIOCM_RI / 2); 3421CTASSERT(SER_DSR == TIOCM_DSR / 2); 3422 3423