tty.c revision 154170
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 154170 2006-01-10 09:19:10Z phk $"); 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#if defined(COMPAT_43TTY) 87#include <sys/ioctl_compat.h> 88#endif 89#include <sys/proc.h> 90#define TTYDEFCHARS 91#include <sys/tty.h> 92#undef TTYDEFCHARS 93#include <sys/fcntl.h> 94#include <sys/conf.h> 95#include <sys/poll.h> 96#include <sys/kernel.h> 97#include <sys/vnode.h> 98#include <sys/serial.h> 99#include <sys/signalvar.h> 100#include <sys/resourcevar.h> 101#include <sys/malloc.h> 102#include <sys/filedesc.h> 103#include <sys/sched.h> 104#include <sys/sysctl.h> 105#include <sys/timepps.h> 106 107#include <machine/stdarg.h> 108 109#include <vm/vm.h> 110#include <vm/pmap.h> 111#include <vm/vm_map.h> 112 113MALLOC_DEFINE(M_TTYS, "ttys", "tty data structures"); 114 115long tk_cancc; 116long tk_nin; 117long tk_nout; 118long tk_rawcc; 119 120static d_open_t ttysopen; 121static d_close_t ttysclose; 122static d_read_t ttysrdwr; 123static d_ioctl_t ttysioctl; 124static d_purge_t ttypurge; 125 126/* Default cdevsw for common tty devices */ 127static struct cdevsw tty_cdevsw = { 128 .d_version = D_VERSION, 129 .d_open = ttyopen, 130 .d_close = ttyclose, 131 .d_ioctl = ttyioctl, 132 .d_purge = ttypurge, 133 .d_name = "ttydrv", 134 .d_flags = D_TTY | D_NEEDGIANT, 135}; 136 137/* Cdevsw for slave tty devices */ 138static struct cdevsw ttys_cdevsw = { 139 .d_version = D_VERSION, 140 .d_open = ttysopen, 141 .d_close = ttysclose, 142 .d_read = ttysrdwr, 143 .d_write = ttysrdwr, 144 .d_ioctl = ttysioctl, 145 .d_name = "TTYS", 146 .d_flags = D_TTY | D_NEEDGIANT, 147}; 148 149static int proc_compare(struct proc *p1, struct proc *p2); 150static int ttnread(struct tty *tp); 151static void ttyecho(int c, struct tty *tp); 152static int ttyoutput(int c, struct tty *tp); 153static void ttypend(struct tty *tp); 154static void ttyretype(struct tty *tp); 155static void ttyrub(int c, struct tty *tp); 156static void ttyrubo(struct tty *tp, int cnt); 157static void ttyunblock(struct tty *tp); 158static int ttywflush(struct tty *tp); 159static int filt_ttyread(struct knote *kn, long hint); 160static void filt_ttyrdetach(struct knote *kn); 161static int filt_ttywrite(struct knote *kn, long hint); 162static void filt_ttywdetach(struct knote *kn); 163 164/* 165 * Table with character classes and parity. The 8th bit indicates parity, 166 * the 7th bit indicates the character is an alphameric or underscore (for 167 * ALTWERASE), and the low 6 bits indicate delay type. If the low 6 bits 168 * are 0 then the character needs no special processing on output; classes 169 * other than 0 might be translated or (not currently) require delays. 170 */ 171#define E 0x00 /* Even parity. */ 172#define O 0x80 /* Odd parity. */ 173#define PARITY(c) (char_type[c] & O) 174 175#define ALPHA 0x40 /* Alpha or underscore. */ 176#define ISALPHA(c) (char_type[(c) & TTY_CHARMASK] & ALPHA) 177 178#define CCLASSMASK 0x3f 179#define CCLASS(c) (char_type[c] & CCLASSMASK) 180 181#define BS BACKSPACE 182#define CC CONTROL 183#define CR RETURN 184#define NA ORDINARY | ALPHA 185#define NL NEWLINE 186#define NO ORDINARY 187#define TB TAB 188#define VT VTAB 189 190static u_char const char_type[] = { 191 E|CC, O|CC, O|CC, E|CC, O|CC, E|CC, E|CC, O|CC, /* nul - bel */ 192 O|BS, E|TB, E|NL, O|CC, E|VT, O|CR, O|CC, E|CC, /* bs - si */ 193 O|CC, E|CC, E|CC, O|CC, E|CC, O|CC, O|CC, E|CC, /* dle - etb */ 194 E|CC, O|CC, O|CC, E|CC, O|CC, E|CC, E|CC, O|CC, /* can - us */ 195 O|NO, E|NO, E|NO, O|NO, E|NO, O|NO, O|NO, E|NO, /* sp - ' */ 196 E|NO, O|NO, O|NO, E|NO, O|NO, E|NO, E|NO, O|NO, /* ( - / */ 197 E|NA, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* 0 - 7 */ 198 O|NA, E|NA, E|NO, O|NO, E|NO, O|NO, O|NO, E|NO, /* 8 - ? */ 199 O|NO, E|NA, E|NA, O|NA, E|NA, O|NA, O|NA, E|NA, /* @ - G */ 200 E|NA, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* H - O */ 201 E|NA, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* P - W */ 202 O|NA, E|NA, E|NA, O|NO, E|NO, O|NO, O|NO, O|NA, /* X - _ */ 203 E|NO, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* ` - g */ 204 O|NA, E|NA, E|NA, O|NA, E|NA, O|NA, O|NA, E|NA, /* h - o */ 205 O|NA, E|NA, E|NA, O|NA, E|NA, O|NA, O|NA, E|NA, /* p - w */ 206 E|NA, O|NA, O|NA, E|NO, O|NO, E|NO, E|NO, O|CC, /* x - del */ 207 /* 208 * Meta chars; should be settable per character set; 209 * for now, treat them all as normal characters. 210 */ 211 NA, NA, NA, NA, NA, NA, NA, NA, 212 NA, NA, NA, NA, NA, NA, NA, NA, 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}; 228#undef BS 229#undef CC 230#undef CR 231#undef NA 232#undef NL 233#undef NO 234#undef TB 235#undef VT 236 237/* Macros to clear/set/test flags. */ 238#define SET(t, f) (t) |= (f) 239#define CLR(t, f) (t) &= ~(f) 240#define ISSET(t, f) ((t) & (f)) 241 242#undef MAX_INPUT /* XXX wrong in <sys/syslimits.h> */ 243#define MAX_INPUT TTYHOG /* XXX limit is usually larger for !ICANON */ 244 245/* 246 * list of struct tty where pstat(8) can pick it up with sysctl 247 * 248 * The lock order is to grab the list mutex before the tty mutex. 249 * Together with additions going on the tail of the list, this allows 250 * the sysctl to avoid doing retries. 251 */ 252static TAILQ_HEAD(, tty) tty_list = TAILQ_HEAD_INITIALIZER(tty_list); 253static struct mtx tty_list_mutex; 254MTX_SYSINIT(tty_list, &tty_list_mutex, "ttylist", MTX_DEF); 255 256static struct unrhdr *tty_unit; 257 258static int drainwait = 5*60; 259SYSCTL_INT(_kern, OID_AUTO, drainwait, CTLFLAG_RW, &drainwait, 260 0, "Output drain timeout in seconds"); 261 262static struct tty * 263tty_gettp(struct cdev *dev) 264{ 265 struct tty *tp; 266 struct cdevsw *csw; 267 268 csw = dev_refthread(dev); 269 KASSERT(csw != NULL, ("No cdevsw in ttycode (%s)", devtoname(dev))); 270 KASSERT(csw->d_flags & D_TTY, 271 ("non D_TTY (%s) in tty code", devtoname(dev))); 272 dev_relthread(dev); 273 tp = dev->si_tty; 274 KASSERT(tp != NULL, 275 ("no tty pointer on (%s) in tty code", devtoname(dev))); 276 return (tp); 277} 278 279/* 280 * Initial open of tty, or (re)entry to standard tty line discipline. 281 */ 282int 283tty_open(struct cdev *device, struct tty *tp) 284{ 285 int s; 286 287 s = spltty(); 288 tp->t_dev = device; 289 tp->t_hotchar = 0; 290 if (!ISSET(tp->t_state, TS_ISOPEN)) { 291 ttyref(tp); 292 SET(tp->t_state, TS_ISOPEN); 293 if (ISSET(tp->t_cflag, CLOCAL)) 294 SET(tp->t_state, TS_CONNECTED); 295 bzero(&tp->t_winsize, sizeof(tp->t_winsize)); 296 } 297 /* XXX don't hang forever on output */ 298 if (tp->t_timeout < 0) 299 tp->t_timeout = drainwait*hz; 300 ttsetwater(tp); 301 splx(s); 302 return (0); 303} 304 305/* 306 * Handle close() on a tty line: flush and set to initial state, 307 * bumping generation number so that pending read/write calls 308 * can detect recycling of the tty. 309 * XXX our caller should have done `spltty(); l_close(); tty_close();' 310 * and l_close() should have flushed, but we repeat the spltty() and 311 * the flush in case there are buggy callers. 312 */ 313int 314tty_close(struct tty *tp) 315{ 316 int s; 317 318 funsetown(&tp->t_sigio); 319 s = spltty(); 320 if (constty == tp) 321 constty_clear(); 322 323 ttyflush(tp, FREAD | FWRITE); 324 clist_free_cblocks(&tp->t_canq); 325 clist_free_cblocks(&tp->t_outq); 326 clist_free_cblocks(&tp->t_rawq); 327 328 tp->t_gen++; 329 tp->t_line = TTYDISC; 330 tp->t_hotchar = 0; 331 tp->t_pgrp = NULL; 332 tp->t_session = NULL; 333 tp->t_state = 0; 334 knlist_clear(&tp->t_rsel.si_note, 0); 335 knlist_clear(&tp->t_wsel.si_note, 0); 336 ttyrel(tp); 337 splx(s); 338 return (0); 339} 340 341#define FLUSHQ(q) { \ 342 if ((q)->c_cc) \ 343 ndflush(q, (q)->c_cc); \ 344} 345 346/* Is 'c' a line delimiter ("break" character)? */ 347#define TTBREAKC(c, lflag) \ 348 ((c) == '\n' || (((c) == cc[VEOF] || \ 349 (c) == cc[VEOL] || ((c) == cc[VEOL2] && lflag & IEXTEN)) && \ 350 (c) != _POSIX_VDISABLE)) 351 352/* 353 * Process input of a single character received on a tty. 354 */ 355int 356ttyinput(int c, struct tty *tp) 357{ 358 tcflag_t iflag, lflag; 359 cc_t *cc; 360 int i, err; 361 362 /* 363 * If input is pending take it first. 364 */ 365 lflag = tp->t_lflag; 366 if (ISSET(lflag, PENDIN)) 367 ttypend(tp); 368 /* 369 * Gather stats. 370 */ 371 if (ISSET(lflag, ICANON)) { 372 ++tk_cancc; 373 ++tp->t_cancc; 374 } else { 375 ++tk_rawcc; 376 ++tp->t_rawcc; 377 } 378 ++tk_nin; 379 380 /* 381 * Block further input iff: 382 * current input > threshold AND input is available to user program 383 * AND input flow control is enabled and not yet invoked. 384 * The 3 is slop for PARMRK. 385 */ 386 iflag = tp->t_iflag; 387 if (tp->t_rawq.c_cc + tp->t_canq.c_cc > tp->t_ihiwat - 3 && 388 (!ISSET(lflag, ICANON) || tp->t_canq.c_cc != 0) && 389 (ISSET(tp->t_cflag, CRTS_IFLOW) || ISSET(iflag, IXOFF)) && 390 !ISSET(tp->t_state, TS_TBLOCK)) 391 ttyblock(tp); 392 393 /* Handle exceptional conditions (break, parity, framing). */ 394 cc = tp->t_cc; 395 err = (ISSET(c, TTY_ERRORMASK)); 396 if (err) { 397 CLR(c, TTY_ERRORMASK); 398 if (ISSET(err, TTY_BI)) { 399 if (ISSET(iflag, IGNBRK)) 400 return (0); 401 if (ISSET(iflag, BRKINT)) { 402 ttyflush(tp, FREAD | FWRITE); 403 if (tp->t_pgrp != NULL) { 404 PGRP_LOCK(tp->t_pgrp); 405 pgsignal(tp->t_pgrp, SIGINT, 1); 406 PGRP_UNLOCK(tp->t_pgrp); 407 } 408 goto endcase; 409 } 410 if (ISSET(iflag, PARMRK)) 411 goto parmrk; 412 } else if ((ISSET(err, TTY_PE) && ISSET(iflag, INPCK)) 413 || ISSET(err, TTY_FE)) { 414 if (ISSET(iflag, IGNPAR)) 415 return (0); 416 else if (ISSET(iflag, PARMRK)) { 417parmrk: 418 if (tp->t_rawq.c_cc + tp->t_canq.c_cc > 419 MAX_INPUT - 3) 420 goto input_overflow; 421 (void)putc(0377 | TTY_QUOTE, &tp->t_rawq); 422 (void)putc(0 | TTY_QUOTE, &tp->t_rawq); 423 (void)putc(c | TTY_QUOTE, &tp->t_rawq); 424 goto endcase; 425 } else 426 c = 0; 427 } 428 } 429 430 if (!ISSET(tp->t_state, TS_TYPEN) && ISSET(iflag, ISTRIP)) 431 CLR(c, 0x80); 432 if (!ISSET(lflag, EXTPROC)) { 433 /* 434 * Check for literal nexting very first 435 */ 436 if (ISSET(tp->t_state, TS_LNCH)) { 437 SET(c, TTY_QUOTE); 438 CLR(tp->t_state, TS_LNCH); 439 } 440 /* 441 * Scan for special characters. This code 442 * is really just a big case statement with 443 * non-constant cases. The bottom of the 444 * case statement is labeled ``endcase'', so goto 445 * it after a case match, or similar. 446 */ 447 448 /* 449 * Control chars which aren't controlled 450 * by ICANON, ISIG, or IXON. 451 */ 452 if (ISSET(lflag, IEXTEN)) { 453 if (CCEQ(cc[VLNEXT], c)) { 454 if (ISSET(lflag, ECHO)) { 455 if (ISSET(lflag, ECHOE)) { 456 (void)ttyoutput('^', tp); 457 (void)ttyoutput('\b', tp); 458 } else 459 ttyecho(c, tp); 460 } 461 SET(tp->t_state, TS_LNCH); 462 goto endcase; 463 } 464 if (CCEQ(cc[VDISCARD], c)) { 465 if (ISSET(lflag, FLUSHO)) 466 CLR(tp->t_lflag, FLUSHO); 467 else { 468 ttyflush(tp, FWRITE); 469 ttyecho(c, tp); 470 if (tp->t_rawq.c_cc + tp->t_canq.c_cc) 471 ttyretype(tp); 472 SET(tp->t_lflag, FLUSHO); 473 } 474 goto startoutput; 475 } 476 } 477 /* 478 * Signals. 479 */ 480 if (ISSET(lflag, ISIG)) { 481 if (CCEQ(cc[VINTR], c) || CCEQ(cc[VQUIT], c)) { 482 if (!ISSET(lflag, NOFLSH)) 483 ttyflush(tp, FREAD | FWRITE); 484 ttyecho(c, tp); 485 if (tp->t_pgrp != NULL) { 486 PGRP_LOCK(tp->t_pgrp); 487 pgsignal(tp->t_pgrp, 488 CCEQ(cc[VINTR], c) ? SIGINT : SIGQUIT, 1); 489 PGRP_UNLOCK(tp->t_pgrp); 490 } 491 goto endcase; 492 } 493 if (CCEQ(cc[VSUSP], c)) { 494 if (!ISSET(lflag, NOFLSH)) 495 ttyflush(tp, FREAD); 496 ttyecho(c, tp); 497 if (tp->t_pgrp != NULL) { 498 PGRP_LOCK(tp->t_pgrp); 499 pgsignal(tp->t_pgrp, SIGTSTP, 1); 500 PGRP_UNLOCK(tp->t_pgrp); 501 } 502 goto endcase; 503 } 504 } 505 /* 506 * Handle start/stop characters. 507 */ 508 if (ISSET(iflag, IXON)) { 509 if (CCEQ(cc[VSTOP], c)) { 510 if (!ISSET(tp->t_state, TS_TTSTOP)) { 511 SET(tp->t_state, TS_TTSTOP); 512 tt_stop(tp, 0); 513 return (0); 514 } 515 if (!CCEQ(cc[VSTART], c)) 516 return (0); 517 /* 518 * if VSTART == VSTOP then toggle 519 */ 520 goto endcase; 521 } 522 if (CCEQ(cc[VSTART], c)) 523 goto restartoutput; 524 } 525 /* 526 * IGNCR, ICRNL, & INLCR 527 */ 528 if (c == '\r') { 529 if (ISSET(iflag, IGNCR)) 530 return (0); 531 else if (ISSET(iflag, ICRNL)) 532 c = '\n'; 533 } else if (c == '\n' && ISSET(iflag, INLCR)) 534 c = '\r'; 535 } 536 if (!ISSET(tp->t_lflag, EXTPROC) && ISSET(lflag, ICANON)) { 537 /* 538 * From here on down canonical mode character 539 * processing takes place. 540 */ 541 /* 542 * erase or erase2 (^H / ^?) 543 */ 544 if (CCEQ(cc[VERASE], c) || CCEQ(cc[VERASE2], c) ) { 545 if (tp->t_rawq.c_cc) 546 ttyrub(unputc(&tp->t_rawq), tp); 547 goto endcase; 548 } 549 /* 550 * kill (^U) 551 */ 552 if (CCEQ(cc[VKILL], c)) { 553 if (ISSET(lflag, ECHOKE) && 554 tp->t_rawq.c_cc == tp->t_rocount && 555 !ISSET(lflag, ECHOPRT)) 556 while (tp->t_rawq.c_cc) 557 ttyrub(unputc(&tp->t_rawq), tp); 558 else { 559 ttyecho(c, tp); 560 if (ISSET(lflag, ECHOK) || 561 ISSET(lflag, ECHOKE)) 562 ttyecho('\n', tp); 563 FLUSHQ(&tp->t_rawq); 564 tp->t_rocount = 0; 565 } 566 CLR(tp->t_state, TS_LOCAL); 567 goto endcase; 568 } 569 /* 570 * word erase (^W) 571 */ 572 if (CCEQ(cc[VWERASE], c) && ISSET(lflag, IEXTEN)) { 573 int ctype; 574 575 /* 576 * erase whitespace 577 */ 578 while ((c = unputc(&tp->t_rawq)) == ' ' || c == '\t') 579 ttyrub(c, tp); 580 if (c == -1) 581 goto endcase; 582 /* 583 * erase last char of word and remember the 584 * next chars type (for ALTWERASE) 585 */ 586 ttyrub(c, tp); 587 c = unputc(&tp->t_rawq); 588 if (c == -1) 589 goto endcase; 590 if (c == ' ' || c == '\t') { 591 (void)putc(c, &tp->t_rawq); 592 goto endcase; 593 } 594 ctype = ISALPHA(c); 595 /* 596 * erase rest of word 597 */ 598 do { 599 ttyrub(c, tp); 600 c = unputc(&tp->t_rawq); 601 if (c == -1) 602 goto endcase; 603 } while (c != ' ' && c != '\t' && 604 (!ISSET(lflag, ALTWERASE) || ISALPHA(c) == ctype)); 605 (void)putc(c, &tp->t_rawq); 606 goto endcase; 607 } 608 /* 609 * reprint line (^R) 610 */ 611 if (CCEQ(cc[VREPRINT], c) && ISSET(lflag, IEXTEN)) { 612 ttyretype(tp); 613 goto endcase; 614 } 615 /* 616 * ^T - kernel info and generate SIGINFO 617 */ 618 if (CCEQ(cc[VSTATUS], c) && ISSET(lflag, IEXTEN)) { 619 if (ISSET(lflag, ISIG) && tp->t_pgrp != NULL) { 620 PGRP_LOCK(tp->t_pgrp); 621 pgsignal(tp->t_pgrp, SIGINFO, 1); 622 PGRP_UNLOCK(tp->t_pgrp); 623 } 624 if (!ISSET(lflag, NOKERNINFO)) 625 ttyinfo(tp); 626 goto endcase; 627 } 628 } 629 /* 630 * Check for input buffer overflow 631 */ 632 if (tp->t_rawq.c_cc + tp->t_canq.c_cc >= MAX_INPUT) { 633input_overflow: 634 if (ISSET(iflag, IMAXBEL)) { 635 if (tp->t_outq.c_cc < tp->t_ohiwat) 636 (void)ttyoutput(CTRL('g'), tp); 637 } 638 goto endcase; 639 } 640 641 if ( c == 0377 && ISSET(iflag, PARMRK) && !ISSET(iflag, ISTRIP) 642 && ISSET(iflag, IGNBRK|IGNPAR) != (IGNBRK|IGNPAR)) 643 (void)putc(0377 | TTY_QUOTE, &tp->t_rawq); 644 645 /* 646 * Put data char in q for user and 647 * wakeup on seeing a line delimiter. 648 */ 649 if (putc(c, &tp->t_rawq) >= 0) { 650 if (!ISSET(lflag, ICANON)) { 651 ttwakeup(tp); 652 ttyecho(c, tp); 653 goto endcase; 654 } 655 if (TTBREAKC(c, lflag)) { 656 tp->t_rocount = 0; 657 catq(&tp->t_rawq, &tp->t_canq); 658 ttwakeup(tp); 659 } else if (tp->t_rocount++ == 0) 660 tp->t_rocol = tp->t_column; 661 if (ISSET(tp->t_state, TS_ERASE)) { 662 /* 663 * end of prterase \.../ 664 */ 665 CLR(tp->t_state, TS_ERASE); 666 (void)ttyoutput('/', tp); 667 } 668 i = tp->t_column; 669 ttyecho(c, tp); 670 if (CCEQ(cc[VEOF], c) && ISSET(lflag, ECHO)) { 671 /* 672 * Place the cursor over the '^' of the ^D. 673 */ 674 i = imin(2, tp->t_column - i); 675 while (i > 0) { 676 (void)ttyoutput('\b', tp); 677 i--; 678 } 679 } 680 } 681endcase: 682 /* 683 * IXANY means allow any character to restart output. 684 */ 685 if (ISSET(tp->t_state, TS_TTSTOP) && 686 !ISSET(iflag, IXANY) && cc[VSTART] != cc[VSTOP]) 687 return (0); 688restartoutput: 689 CLR(tp->t_lflag, FLUSHO); 690 CLR(tp->t_state, TS_TTSTOP); 691startoutput: 692 return (ttstart(tp)); 693} 694 695/* 696 * Output a single character on a tty, doing output processing 697 * as needed (expanding tabs, newline processing, etc.). 698 * Returns < 0 if succeeds, otherwise returns char to resend. 699 * Must be recursive. 700 */ 701static int 702ttyoutput(int c, struct tty *tp) 703{ 704 tcflag_t oflag; 705 int col, s; 706 707 oflag = tp->t_oflag; 708 if (!ISSET(oflag, OPOST)) { 709 if (ISSET(tp->t_lflag, FLUSHO)) 710 return (-1); 711 if (putc(c, &tp->t_outq)) 712 return (c); 713 tk_nout++; 714 tp->t_outcc++; 715 return (-1); 716 } 717 /* 718 * Do tab expansion if OXTABS is set. Special case if we external 719 * processing, we don't do the tab expansion because we'll probably 720 * get it wrong. If tab expansion needs to be done, let it happen 721 * externally. 722 */ 723 CLR(c, ~TTY_CHARMASK); 724 if (c == '\t' && 725 ISSET(oflag, OXTABS) && !ISSET(tp->t_lflag, EXTPROC)) { 726 c = 8 - (tp->t_column & 7); 727 if (!ISSET(tp->t_lflag, FLUSHO)) { 728 s = spltty(); /* Don't interrupt tabs. */ 729 c -= b_to_q(" ", c, &tp->t_outq); 730 tk_nout += c; 731 tp->t_outcc += c; 732 splx(s); 733 } 734 tp->t_column += c; 735 return (c ? -1 : '\t'); 736 } 737 if (c == CEOT && ISSET(oflag, ONOEOT)) 738 return (-1); 739 740 /* 741 * Newline translation: if ONLCR is set, 742 * translate newline into "\r\n". 743 */ 744 if (c == '\n' && ISSET(tp->t_oflag, ONLCR)) { 745 tk_nout++; 746 tp->t_outcc++; 747 if (!ISSET(tp->t_lflag, FLUSHO) && putc('\r', &tp->t_outq)) 748 return (c); 749 } 750 /* If OCRNL is set, translate "\r" into "\n". */ 751 else if (c == '\r' && ISSET(tp->t_oflag, OCRNL)) 752 c = '\n'; 753 /* If ONOCR is set, don't transmit CRs when on column 0. */ 754 else if (c == '\r' && ISSET(tp->t_oflag, ONOCR) && tp->t_column == 0) 755 return (-1); 756 757 tk_nout++; 758 tp->t_outcc++; 759 if (!ISSET(tp->t_lflag, FLUSHO) && putc(c, &tp->t_outq)) 760 return (c); 761 762 col = tp->t_column; 763 switch (CCLASS(c)) { 764 case BACKSPACE: 765 if (col > 0) 766 --col; 767 break; 768 case CONTROL: 769 break; 770 case NEWLINE: 771 if (ISSET(tp->t_oflag, ONLCR | ONLRET)) 772 col = 0; 773 break; 774 case RETURN: 775 col = 0; 776 break; 777 case ORDINARY: 778 ++col; 779 break; 780 case TAB: 781 col = (col + 8) & ~7; 782 break; 783 } 784 tp->t_column = col; 785 return (-1); 786} 787 788/* 789 * Ioctls for all tty devices. Called after line-discipline specific ioctl 790 * has been called to do discipline-specific functions and/or reject any 791 * of these ioctl commands. 792 */ 793/* ARGSUSED */ 794int 795ttioctl(struct tty *tp, u_long cmd, void *data, int flag) 796{ 797 struct proc *p; 798 struct thread *td; 799 struct pgrp *pgrp; 800 int s, error, bits, sig, sig2; 801 802 td = curthread; /* XXX */ 803 p = td->td_proc; 804 805 /* If the ioctl involves modification, hang if in the background. */ 806 switch (cmd) { 807 case TIOCCBRK: 808 case TIOCCONS: 809 case TIOCDRAIN: 810 case TIOCEXCL: 811 case TIOCFLUSH: 812#ifdef TIOCHPCL 813 case TIOCHPCL: 814#endif 815 case TIOCNXCL: 816 case TIOCSBRK: 817 case TIOCSCTTY: 818 case TIOCSDRAINWAIT: 819 case TIOCSETA: 820 case TIOCSETAF: 821 case TIOCSETAW: 822 case TIOCSETD: 823 case TIOCSPGRP: 824 case TIOCSTART: 825 case TIOCSTAT: 826 case TIOCSTI: 827 case TIOCSTOP: 828 case TIOCSWINSZ: 829#if defined(COMPAT_43TTY) 830 case TIOCLBIC: 831 case TIOCLBIS: 832 case TIOCLSET: 833 case TIOCSETC: 834 case OTIOCSETD: 835 case TIOCSETN: 836 case TIOCSETP: 837 case TIOCSLTC: 838#endif 839 sx_slock(&proctree_lock); 840 PROC_LOCK(p); 841 while (isbackground(p, tp) && !(p->p_flag & P_PPWAIT) && 842 !SIGISMEMBER(p->p_sigacts->ps_sigignore, SIGTTOU) && 843 !SIGISMEMBER(td->td_sigmask, SIGTTOU)) { 844 pgrp = p->p_pgrp; 845 PROC_UNLOCK(p); 846 if (pgrp->pg_jobc == 0) { 847 sx_sunlock(&proctree_lock); 848 return (EIO); 849 } 850 PGRP_LOCK(pgrp); 851 sx_sunlock(&proctree_lock); 852 pgsignal(pgrp, SIGTTOU, 1); 853 PGRP_UNLOCK(pgrp); 854 error = ttysleep(tp, &lbolt, TTOPRI | PCATCH, "ttybg1", 855 0); 856 if (error) 857 return (error); 858 sx_slock(&proctree_lock); 859 PROC_LOCK(p); 860 } 861 PROC_UNLOCK(p); 862 sx_sunlock(&proctree_lock); 863 break; 864 } 865 866 867 if (tp->t_modem != NULL) { 868 switch (cmd) { 869 case TIOCSDTR: 870 tt_modem(tp, SER_DTR, 0); 871 return (0); 872 case TIOCCDTR: 873 tt_modem(tp, 0, SER_DTR); 874 return (0); 875 case TIOCMSET: 876 bits = *(int *)data; 877 sig = (bits & (TIOCM_DTR | TIOCM_RTS)) >> 1; 878 sig2 = ((~bits) & (TIOCM_DTR | TIOCM_RTS)) >> 1; 879 tt_modem(tp, sig, sig2); 880 return (0); 881 case TIOCMBIS: 882 bits = *(int *)data; 883 sig = (bits & (TIOCM_DTR | TIOCM_RTS)) >> 1; 884 tt_modem(tp, sig, 0); 885 return (0); 886 case TIOCMBIC: 887 bits = *(int *)data; 888 sig = (bits & (TIOCM_DTR | TIOCM_RTS)) >> 1; 889 tt_modem(tp, 0, sig); 890 return (0); 891 case TIOCMGET: 892 sig = tt_modem(tp, 0, 0); 893 /* See <sys/serial.h. for the "<< 1" stuff */ 894 bits = TIOCM_LE + (sig << 1); 895 *(int *)data = bits; 896 return (0); 897 default: 898 break; 899 } 900 } 901 902 if (tp->t_pps != NULL) { 903 error = pps_ioctl(cmd, data, tp->t_pps); 904 if (error != ENOIOCTL) 905 return (error); 906 } 907 908 switch (cmd) { /* Process the ioctl. */ 909 case FIOASYNC: /* set/clear async i/o */ 910 s = spltty(); 911 if (*(int *)data) 912 SET(tp->t_state, TS_ASYNC); 913 else 914 CLR(tp->t_state, TS_ASYNC); 915 splx(s); 916 break; 917 case FIONBIO: /* set/clear non-blocking i/o */ 918 break; /* XXX: delete. */ 919 case FIONREAD: /* get # bytes to read */ 920 s = spltty(); 921 *(int *)data = ttnread(tp); 922 splx(s); 923 break; 924 925 case FIOSETOWN: 926 /* 927 * Policy -- Don't allow FIOSETOWN on someone else's 928 * controlling tty 929 */ 930 if (tp->t_session != NULL && !isctty(p, tp)) 931 return (ENOTTY); 932 933 error = fsetown(*(int *)data, &tp->t_sigio); 934 if (error) 935 return (error); 936 break; 937 case FIOGETOWN: 938 if (tp->t_session != NULL && !isctty(p, tp)) 939 return (ENOTTY); 940 *(int *)data = fgetown(&tp->t_sigio); 941 break; 942 943 case TIOCEXCL: /* set exclusive use of tty */ 944 s = spltty(); 945 SET(tp->t_state, TS_XCLUDE); 946 splx(s); 947 break; 948 case TIOCFLUSH: { /* flush buffers */ 949 int flags = *(int *)data; 950 951 if (flags == 0) 952 flags = FREAD | FWRITE; 953 else 954 flags &= FREAD | FWRITE; 955 ttyflush(tp, flags); 956 break; 957 } 958 case TIOCCONS: /* become virtual console */ 959 if (*(int *)data) { 960 struct nameidata nid; 961 962 if (constty && constty != tp && 963 ISSET(constty->t_state, TS_CONNECTED)) 964 return (EBUSY); 965 966 /* Ensure user can open the real console. */ 967 NDINIT(&nid, LOOKUP, LOCKLEAF | FOLLOW, UIO_SYSSPACE, 968 "/dev/console", td); 969 if ((error = namei(&nid)) != 0) 970 return (error); 971 NDFREE(&nid, NDF_ONLY_PNBUF); 972 error = VOP_ACCESS(nid.ni_vp, VREAD, td->td_ucred, td); 973 vput(nid.ni_vp); 974 if (error) 975 return (error); 976 977 constty_set(tp); 978 } else if (tp == constty) 979 constty_clear(); 980 break; 981 case TIOCDRAIN: /* wait till output drained */ 982 error = ttywait(tp); 983 if (error) 984 return (error); 985 break; 986 case TIOCGETA: { /* get termios struct */ 987 struct termios *t = (struct termios *)data; 988 989 bcopy(&tp->t_termios, t, sizeof(struct termios)); 990 break; 991 } 992 case TIOCGETD: /* get line discipline */ 993 *(int *)data = tp->t_line; 994 break; 995 case TIOCGWINSZ: /* get window size */ 996 *(struct winsize *)data = tp->t_winsize; 997 break; 998 case TIOCGPGRP: /* get pgrp of tty */ 999 if (!isctty(p, tp)) 1000 return (ENOTTY); 1001 *(int *)data = tp->t_pgrp ? tp->t_pgrp->pg_id : NO_PID; 1002 break; 1003#ifdef TIOCHPCL 1004 case TIOCHPCL: /* hang up on last close */ 1005 s = spltty(); 1006 SET(tp->t_cflag, HUPCL); 1007 splx(s); 1008 break; 1009#endif 1010 case TIOCMGDTRWAIT: 1011 *(int *)data = tp->t_dtr_wait * 100 / hz; 1012 break; 1013 case TIOCMSDTRWAIT: 1014 /* must be root since the wait applies to following logins */ 1015 error = suser(td); 1016 if (error) 1017 return (error); 1018 tp->t_dtr_wait = *(int *)data * hz / 100; 1019 break; 1020 case TIOCNXCL: /* reset exclusive use of tty */ 1021 s = spltty(); 1022 CLR(tp->t_state, TS_XCLUDE); 1023 splx(s); 1024 break; 1025 case TIOCOUTQ: /* output queue size */ 1026 *(int *)data = tp->t_outq.c_cc; 1027 break; 1028 case TIOCSETA: /* set termios struct */ 1029 case TIOCSETAW: /* drain output, set */ 1030 case TIOCSETAF: { /* drn out, fls in, set */ 1031 struct termios *t = (struct termios *)data; 1032 1033 if (t->c_ispeed == 0) 1034 t->c_ispeed = t->c_ospeed; 1035 if (t->c_ispeed == 0) 1036 t->c_ispeed = tp->t_ospeed; 1037 if (t->c_ispeed == 0) 1038 return (EINVAL); 1039 s = spltty(); 1040 if (cmd == TIOCSETAW || cmd == TIOCSETAF) { 1041 error = ttywait(tp); 1042 if (error) { 1043 splx(s); 1044 return (error); 1045 } 1046 if (cmd == TIOCSETAF) 1047 ttyflush(tp, FREAD); 1048 } 1049 if (!ISSET(t->c_cflag, CIGNORE)) { 1050 /* 1051 * Set device hardware. 1052 */ 1053 error = tt_param(tp, t); 1054 if (error) { 1055 splx(s); 1056 return (error); 1057 } 1058 if (ISSET(t->c_cflag, CLOCAL) && 1059 !ISSET(tp->t_cflag, CLOCAL)) { 1060 /* 1061 * XXX disconnections would be too hard to 1062 * get rid of without this kludge. The only 1063 * way to get rid of controlling terminals 1064 * is to exit from the session leader. 1065 */ 1066 CLR(tp->t_state, TS_ZOMBIE); 1067 1068 wakeup(TSA_CARR_ON(tp)); 1069 ttwakeup(tp); 1070 ttwwakeup(tp); 1071 } 1072 if ((ISSET(tp->t_state, TS_CARR_ON) || 1073 ISSET(t->c_cflag, CLOCAL)) && 1074 !ISSET(tp->t_state, TS_ZOMBIE)) 1075 SET(tp->t_state, TS_CONNECTED); 1076 else 1077 CLR(tp->t_state, TS_CONNECTED); 1078 tp->t_cflag = t->c_cflag; 1079 tp->t_ispeed = t->c_ispeed; 1080 if (t->c_ospeed != 0) 1081 tp->t_ospeed = t->c_ospeed; 1082 ttsetwater(tp); 1083 } 1084 if (ISSET(t->c_lflag, ICANON) != ISSET(tp->t_lflag, ICANON) && 1085 cmd != TIOCSETAF) { 1086 if (ISSET(t->c_lflag, ICANON)) 1087 SET(tp->t_lflag, PENDIN); 1088 else { 1089 /* 1090 * XXX we really shouldn't allow toggling 1091 * ICANON while we're in a non-termios line 1092 * discipline. Now we have to worry about 1093 * panicing for a null queue. 1094 */ 1095 if (tp->t_canq.c_cbreserved > 0 && 1096 tp->t_rawq.c_cbreserved > 0) { 1097 catq(&tp->t_rawq, &tp->t_canq); 1098 /* 1099 * XXX the queue limits may be 1100 * different, so the old queue 1101 * swapping method no longer works. 1102 */ 1103 catq(&tp->t_canq, &tp->t_rawq); 1104 } 1105 CLR(tp->t_lflag, PENDIN); 1106 } 1107 ttwakeup(tp); 1108 } 1109 tp->t_iflag = t->c_iflag; 1110 tp->t_oflag = t->c_oflag; 1111 /* 1112 * Make the EXTPROC bit read only. 1113 */ 1114 if (ISSET(tp->t_lflag, EXTPROC)) 1115 SET(t->c_lflag, EXTPROC); 1116 else 1117 CLR(t->c_lflag, EXTPROC); 1118 tp->t_lflag = t->c_lflag | ISSET(tp->t_lflag, PENDIN); 1119 if (t->c_cc[VMIN] != tp->t_cc[VMIN] || 1120 t->c_cc[VTIME] != tp->t_cc[VTIME]) 1121 ttwakeup(tp); 1122 bcopy(t->c_cc, tp->t_cc, sizeof(t->c_cc)); 1123 splx(s); 1124 break; 1125 } 1126 case TIOCSETD: { /* set line discipline */ 1127 int t = *(int *)data; 1128 1129 if ((u_int)t >= nlinesw) 1130 return (ENXIO); 1131 if (t == tp->t_line) 1132 return (0); 1133 s = spltty(); 1134 ttyld_close(tp, flag); 1135 tp->t_line = t; 1136 /* XXX: we should use the correct cdev here */ 1137 error = ttyld_open(tp, tp->t_dev); 1138 if (error) { 1139 /* 1140 * If we fail to switch line discipline we cannot 1141 * fall back to the previous, because we can not 1142 * trust that ldisc to open successfully either. 1143 * Fall back to the default ldisc which we know 1144 * will allways succeed. 1145 */ 1146 tp->t_line = TTYDISC; 1147 (void)ttyld_open(tp, tp->t_dev); 1148 } 1149 splx(s); 1150 return (error); 1151 break; 1152 } 1153 case TIOCSTART: /* start output, like ^Q */ 1154 s = spltty(); 1155 if (ISSET(tp->t_state, TS_TTSTOP) || 1156 ISSET(tp->t_lflag, FLUSHO)) { 1157 CLR(tp->t_lflag, FLUSHO); 1158 CLR(tp->t_state, TS_TTSTOP); 1159 ttstart(tp); 1160 } 1161 splx(s); 1162 break; 1163 case TIOCSTI: /* simulate terminal input */ 1164 if ((flag & FREAD) == 0 && suser(td)) 1165 return (EPERM); 1166 if (!isctty(p, tp) && suser(td)) 1167 return (EACCES); 1168 s = spltty(); 1169 ttyld_rint(tp, *(u_char *)data); 1170 splx(s); 1171 break; 1172 case TIOCSTOP: /* stop output, like ^S */ 1173 s = spltty(); 1174 if (!ISSET(tp->t_state, TS_TTSTOP)) { 1175 SET(tp->t_state, TS_TTSTOP); 1176 tt_stop(tp, 0); 1177 } 1178 splx(s); 1179 break; 1180 case TIOCSCTTY: /* become controlling tty */ 1181 /* Session ctty vnode pointer set in vnode layer. */ 1182 sx_slock(&proctree_lock); 1183 if (!SESS_LEADER(p) || 1184 ((p->p_session->s_ttyvp || tp->t_session) && 1185 (tp->t_session != p->p_session))) { 1186 sx_sunlock(&proctree_lock); 1187 return (EPERM); 1188 } 1189 tp->t_session = p->p_session; 1190 tp->t_pgrp = p->p_pgrp; 1191 SESS_LOCK(p->p_session); 1192 ttyref(tp); /* ttyrel(): kern_proc.c:pgdelete() */ 1193 p->p_session->s_ttyp = tp; 1194 SESS_UNLOCK(p->p_session); 1195 PROC_LOCK(p); 1196 p->p_flag |= P_CONTROLT; 1197 PROC_UNLOCK(p); 1198 sx_sunlock(&proctree_lock); 1199 break; 1200 case TIOCSPGRP: { /* set pgrp of tty */ 1201 sx_slock(&proctree_lock); 1202 pgrp = pgfind(*(int *)data); 1203 if (!isctty(p, tp)) { 1204 if (pgrp != NULL) 1205 PGRP_UNLOCK(pgrp); 1206 sx_sunlock(&proctree_lock); 1207 return (ENOTTY); 1208 } 1209 if (pgrp == NULL) { 1210 sx_sunlock(&proctree_lock); 1211 return (EPERM); 1212 } 1213 PGRP_UNLOCK(pgrp); 1214 if (pgrp->pg_session != p->p_session) { 1215 sx_sunlock(&proctree_lock); 1216 return (EPERM); 1217 } 1218 sx_sunlock(&proctree_lock); 1219 tp->t_pgrp = pgrp; 1220 break; 1221 } 1222 case TIOCSTAT: /* simulate control-T */ 1223 s = spltty(); 1224 ttyinfo(tp); 1225 splx(s); 1226 break; 1227 case TIOCSWINSZ: /* set window size */ 1228 if (bcmp((caddr_t)&tp->t_winsize, data, 1229 sizeof (struct winsize))) { 1230 tp->t_winsize = *(struct winsize *)data; 1231 if (tp->t_pgrp != NULL) { 1232 PGRP_LOCK(tp->t_pgrp); 1233 pgsignal(tp->t_pgrp, SIGWINCH, 1); 1234 PGRP_UNLOCK(tp->t_pgrp); 1235 } 1236 } 1237 break; 1238 case TIOCSDRAINWAIT: 1239 error = suser(td); 1240 if (error) 1241 return (error); 1242 tp->t_timeout = *(int *)data * hz; 1243 wakeup(TSA_OCOMPLETE(tp)); 1244 wakeup(TSA_OLOWAT(tp)); 1245 break; 1246 case TIOCGDRAINWAIT: 1247 *(int *)data = tp->t_timeout / hz; 1248 break; 1249 case TIOCSBRK: 1250 return (tt_break(tp, 1)); 1251 case TIOCCBRK: 1252 return (tt_break(tp, 0)); 1253 default: 1254#if defined(COMPAT_43TTY) 1255 return (ttcompat(tp, cmd, data, flag)); 1256#else 1257 return (ENOIOCTL); 1258#endif 1259 } 1260 return (0); 1261} 1262 1263int 1264ttypoll(struct cdev *dev, int events, struct thread *td) 1265{ 1266 int s; 1267 int revents = 0; 1268 struct tty *tp; 1269 1270 tp = tty_gettp(dev); 1271 1272 if (tp == NULL) /* XXX used to return ENXIO, but that means true! */ 1273 return ((events & (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM)) 1274 | POLLHUP); 1275 1276 s = spltty(); 1277 if (events & (POLLIN | POLLRDNORM)) { 1278 if (ISSET(tp->t_state, TS_ZOMBIE)) 1279 revents |= (events & (POLLIN | POLLRDNORM)) | 1280 POLLHUP; 1281 else if (ttnread(tp) > 0) 1282 revents |= events & (POLLIN | POLLRDNORM); 1283 else 1284 selrecord(td, &tp->t_rsel); 1285 } 1286 if (events & POLLOUT) { 1287 if (ISSET(tp->t_state, TS_ZOMBIE)) 1288 revents |= POLLHUP; 1289 else if (tp->t_outq.c_cc <= tp->t_olowat && 1290 ISSET(tp->t_state, TS_CONNECTED)) 1291 revents |= events & POLLOUT; 1292 else 1293 selrecord(td, &tp->t_wsel); 1294 } 1295 splx(s); 1296 return (revents); 1297} 1298 1299static struct filterops ttyread_filtops = 1300 { 1, NULL, filt_ttyrdetach, filt_ttyread }; 1301static struct filterops ttywrite_filtops = 1302 { 1, NULL, filt_ttywdetach, filt_ttywrite }; 1303 1304int 1305ttykqfilter(struct cdev *dev, struct knote *kn) 1306{ 1307 struct tty *tp; 1308 struct knlist *klist; 1309 int s; 1310 1311 tp = tty_gettp(dev); 1312 1313 switch (kn->kn_filter) { 1314 case EVFILT_READ: 1315 klist = &tp->t_rsel.si_note; 1316 kn->kn_fop = &ttyread_filtops; 1317 break; 1318 case EVFILT_WRITE: 1319 klist = &tp->t_wsel.si_note; 1320 kn->kn_fop = &ttywrite_filtops; 1321 break; 1322 default: 1323 return (EINVAL); 1324 } 1325 1326 kn->kn_hook = (caddr_t)dev; 1327 1328 s = spltty(); 1329 knlist_add(klist, kn, 0); 1330 splx(s); 1331 1332 return (0); 1333} 1334 1335static void 1336filt_ttyrdetach(struct knote *kn) 1337{ 1338 struct tty *tp = ((struct cdev *)kn->kn_hook)->si_tty; 1339 int s = spltty(); 1340 1341 knlist_remove(&tp->t_rsel.si_note, kn, 0); 1342 splx(s); 1343} 1344 1345static int 1346filt_ttyread(struct knote *kn, long hint) 1347{ 1348 struct tty *tp = ((struct cdev *)kn->kn_hook)->si_tty; 1349 1350 kn->kn_data = ttnread(tp); 1351 if (ISSET(tp->t_state, TS_ZOMBIE)) { 1352 kn->kn_flags |= EV_EOF; 1353 return (1); 1354 } 1355 return (kn->kn_data > 0); 1356} 1357 1358static void 1359filt_ttywdetach(struct knote *kn) 1360{ 1361 struct tty *tp = ((struct cdev *)kn->kn_hook)->si_tty; 1362 int s = spltty(); 1363 1364 knlist_remove(&tp->t_wsel.si_note, kn, 0); 1365 splx(s); 1366} 1367 1368static int 1369filt_ttywrite(struct knote *kn, long hint) 1370{ 1371 struct tty *tp = ((struct cdev *)kn->kn_hook)->si_tty; 1372 1373 kn->kn_data = tp->t_outq.c_cc; 1374 if (ISSET(tp->t_state, TS_ZOMBIE)) 1375 return (1); 1376 return (kn->kn_data <= tp->t_olowat && 1377 ISSET(tp->t_state, TS_CONNECTED)); 1378} 1379 1380/* 1381 * Must be called at spltty(). 1382 */ 1383static int 1384ttnread(struct tty *tp) 1385{ 1386 int nread; 1387 1388 if (ISSET(tp->t_lflag, PENDIN)) 1389 ttypend(tp); 1390 nread = tp->t_canq.c_cc; 1391 if (!ISSET(tp->t_lflag, ICANON)) { 1392 nread += tp->t_rawq.c_cc; 1393 if (nread < tp->t_cc[VMIN] && tp->t_cc[VTIME] == 0) 1394 nread = 0; 1395 } 1396 return (nread); 1397} 1398 1399/* 1400 * Wait for output to drain. 1401 */ 1402int 1403ttywait(struct tty *tp) 1404{ 1405 int error, s; 1406 1407 error = 0; 1408 s = spltty(); 1409 while ((tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY)) && 1410 ISSET(tp->t_state, TS_CONNECTED) && tp->t_oproc) { 1411 tt_oproc(tp); 1412 if ((tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY)) && 1413 ISSET(tp->t_state, TS_CONNECTED)) { 1414 SET(tp->t_state, TS_SO_OCOMPLETE); 1415 error = ttysleep(tp, TSA_OCOMPLETE(tp), 1416 TTOPRI | PCATCH, "ttywai", 1417 tp->t_timeout); 1418 if (error) { 1419 if (error == EWOULDBLOCK) 1420 error = EIO; 1421 break; 1422 } 1423 } else 1424 break; 1425 } 1426 if (!error && (tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY))) 1427 error = EIO; 1428 splx(s); 1429 return (error); 1430} 1431 1432/* 1433 * Flush if successfully wait. 1434 */ 1435static int 1436ttywflush(struct tty *tp) 1437{ 1438 int error; 1439 1440 if ((error = ttywait(tp)) == 0) 1441 ttyflush(tp, FREAD); 1442 return (error); 1443} 1444 1445/* 1446 * Flush tty read and/or write queues, notifying anyone waiting. 1447 */ 1448void 1449ttyflush(struct tty *tp, int rw) 1450{ 1451 int s; 1452 1453 s = spltty(); 1454#if 0 1455again: 1456#endif 1457 if (rw & FWRITE) { 1458 FLUSHQ(&tp->t_outq); 1459 CLR(tp->t_state, TS_TTSTOP); 1460 } 1461 tt_stop(tp, rw); 1462 if (rw & FREAD) { 1463 FLUSHQ(&tp->t_canq); 1464 FLUSHQ(&tp->t_rawq); 1465 CLR(tp->t_lflag, PENDIN); 1466 tp->t_rocount = 0; 1467 tp->t_rocol = 0; 1468 CLR(tp->t_state, TS_LOCAL); 1469 ttwakeup(tp); 1470 if (ISSET(tp->t_state, TS_TBLOCK)) { 1471 if (rw & FWRITE) 1472 FLUSHQ(&tp->t_outq); 1473 ttyunblock(tp); 1474 1475 /* 1476 * Don't let leave any state that might clobber the 1477 * next line discipline (although we should do more 1478 * to send the START char). Not clearing the state 1479 * may have caused the "putc to a clist with no 1480 * reserved cblocks" panic/printf. 1481 */ 1482 CLR(tp->t_state, TS_TBLOCK); 1483 1484#if 0 /* forget it, sleeping isn't always safe and we don't know when it is */ 1485 if (ISSET(tp->t_iflag, IXOFF)) { 1486 /* 1487 * XXX wait a bit in the hope that the stop 1488 * character (if any) will go out. Waiting 1489 * isn't good since it allows races. This 1490 * will be fixed when the stop character is 1491 * put in a special queue. Don't bother with 1492 * the checks in ttywait() since the timeout 1493 * will save us. 1494 */ 1495 SET(tp->t_state, TS_SO_OCOMPLETE); 1496 ttysleep(tp, TSA_OCOMPLETE(tp), TTOPRI, 1497 "ttyfls", hz / 10); 1498 /* 1499 * Don't try sending the stop character again. 1500 */ 1501 CLR(tp->t_state, TS_TBLOCK); 1502 goto again; 1503 } 1504#endif 1505 } 1506 } 1507 if (rw & FWRITE) { 1508 FLUSHQ(&tp->t_outq); 1509 ttwwakeup(tp); 1510 } 1511 splx(s); 1512} 1513 1514/* 1515 * Copy in the default termios characters. 1516 */ 1517void 1518termioschars(struct termios *t) 1519{ 1520 1521 bcopy(ttydefchars, t->c_cc, sizeof t->c_cc); 1522} 1523 1524/* 1525 * Old interface. 1526 */ 1527void 1528ttychars(struct tty *tp) 1529{ 1530 1531 termioschars(&tp->t_termios); 1532} 1533 1534/* 1535 * Handle input high water. Send stop character for the IXOFF case. Turn 1536 * on our input flow control bit and propagate the changes to the driver. 1537 * XXX the stop character should be put in a special high priority queue. 1538 */ 1539void 1540ttyblock(struct tty *tp) 1541{ 1542 1543 SET(tp->t_state, TS_TBLOCK); 1544 if (ISSET(tp->t_iflag, IXOFF) && tp->t_cc[VSTOP] != _POSIX_VDISABLE && 1545 putc(tp->t_cc[VSTOP], &tp->t_outq) != 0) 1546 CLR(tp->t_state, TS_TBLOCK); /* try again later */ 1547 ttstart(tp); 1548} 1549 1550/* 1551 * Handle input low water. Send start character for the IXOFF case. Turn 1552 * off our input flow control bit and propagate the changes to the driver. 1553 * XXX the start character should be put in a special high priority queue. 1554 */ 1555static void 1556ttyunblock(struct tty *tp) 1557{ 1558 1559 CLR(tp->t_state, TS_TBLOCK); 1560 if (ISSET(tp->t_iflag, IXOFF) && tp->t_cc[VSTART] != _POSIX_VDISABLE && 1561 putc(tp->t_cc[VSTART], &tp->t_outq) != 0) 1562 SET(tp->t_state, TS_TBLOCK); /* try again later */ 1563 ttstart(tp); 1564} 1565 1566#ifdef notyet 1567/* Not used by any current (i386) drivers. */ 1568/* 1569 * Restart after an inter-char delay. 1570 */ 1571void 1572ttrstrt(void *tp_arg) 1573{ 1574 struct tty *tp; 1575 int s; 1576 1577 KASSERT(tp_arg != NULL, ("ttrstrt")); 1578 1579 tp = tp_arg; 1580 s = spltty(); 1581 1582 CLR(tp->t_state, TS_TIMEOUT); 1583 ttstart(tp); 1584 1585 splx(s); 1586} 1587#endif 1588 1589int 1590ttstart(struct tty *tp) 1591{ 1592 1593 tt_oproc(tp); 1594 return (0); 1595} 1596 1597/* 1598 * "close" a line discipline 1599 */ 1600int 1601ttylclose(struct tty *tp, int flag) 1602{ 1603 1604 if (flag & FNONBLOCK || ttywflush(tp)) 1605 ttyflush(tp, FREAD | FWRITE); 1606 return (0); 1607} 1608 1609/* 1610 * Handle modem control transition on a tty. 1611 * Flag indicates new state of carrier. 1612 * Returns 0 if the line should be turned off, otherwise 1. 1613 */ 1614int 1615ttymodem(struct tty *tp, int flag) 1616{ 1617 1618 if (ISSET(tp->t_state, TS_CARR_ON) && ISSET(tp->t_cflag, MDMBUF)) { 1619 /* 1620 * MDMBUF: do flow control according to carrier flag 1621 * XXX TS_CAR_OFLOW doesn't do anything yet. TS_TTSTOP 1622 * works if IXON and IXANY are clear. 1623 */ 1624 if (flag) { 1625 CLR(tp->t_state, TS_CAR_OFLOW); 1626 CLR(tp->t_state, TS_TTSTOP); 1627 ttstart(tp); 1628 } else if (!ISSET(tp->t_state, TS_CAR_OFLOW)) { 1629 SET(tp->t_state, TS_CAR_OFLOW); 1630 SET(tp->t_state, TS_TTSTOP); 1631 tt_stop(tp, 0); 1632 } 1633 } else if (flag == 0) { 1634 /* 1635 * Lost carrier. 1636 */ 1637 CLR(tp->t_state, TS_CARR_ON); 1638 if (ISSET(tp->t_state, TS_ISOPEN) && 1639 !ISSET(tp->t_cflag, CLOCAL)) { 1640 SET(tp->t_state, TS_ZOMBIE); 1641 CLR(tp->t_state, TS_CONNECTED); 1642 if (tp->t_session) { 1643 sx_slock(&proctree_lock); 1644 if (tp->t_session->s_leader) { 1645 struct proc *p; 1646 1647 p = tp->t_session->s_leader; 1648 PROC_LOCK(p); 1649 psignal(p, SIGHUP); 1650 PROC_UNLOCK(p); 1651 } 1652 sx_sunlock(&proctree_lock); 1653 } 1654 ttyflush(tp, FREAD | FWRITE); 1655 return (0); 1656 } 1657 } else { 1658 /* 1659 * Carrier now on. 1660 */ 1661 SET(tp->t_state, TS_CARR_ON); 1662 if (!ISSET(tp->t_state, TS_ZOMBIE)) 1663 SET(tp->t_state, TS_CONNECTED); 1664 wakeup(TSA_CARR_ON(tp)); 1665 ttwakeup(tp); 1666 ttwwakeup(tp); 1667 } 1668 return (1); 1669} 1670 1671/* 1672 * Reinput pending characters after state switch 1673 * call at spltty(). 1674 */ 1675static void 1676ttypend(struct tty *tp) 1677{ 1678 struct clist tq; 1679 int c; 1680 1681 CLR(tp->t_lflag, PENDIN); 1682 SET(tp->t_state, TS_TYPEN); 1683 /* 1684 * XXX this assumes too much about clist internals. It may even 1685 * fail if the cblock slush pool is empty. We can't allocate more 1686 * cblocks here because we are called from an interrupt handler 1687 * and clist_alloc_cblocks() can wait. 1688 */ 1689 tq = tp->t_rawq; 1690 bzero(&tp->t_rawq, sizeof tp->t_rawq); 1691 tp->t_rawq.c_cbmax = tq.c_cbmax; 1692 tp->t_rawq.c_cbreserved = tq.c_cbreserved; 1693 while ((c = getc(&tq)) >= 0) 1694 ttyinput(c, tp); 1695 CLR(tp->t_state, TS_TYPEN); 1696} 1697 1698/* 1699 * Process a read call on a tty device. 1700 */ 1701int 1702ttread(struct tty *tp, struct uio *uio, int flag) 1703{ 1704 struct clist *qp; 1705 int c; 1706 tcflag_t lflag; 1707 cc_t *cc = tp->t_cc; 1708 struct thread *td; 1709 struct proc *p; 1710 int s, first, error = 0; 1711 int has_stime = 0, last_cc = 0; 1712 long slp = 0; /* XXX this should be renamed `timo'. */ 1713 struct timeval stime; 1714 struct pgrp *pg; 1715 1716 td = curthread; 1717 p = td->td_proc; 1718loop: 1719 s = spltty(); 1720 lflag = tp->t_lflag; 1721 /* 1722 * take pending input first 1723 */ 1724 if (ISSET(lflag, PENDIN)) { 1725 ttypend(tp); 1726 splx(s); /* reduce latency */ 1727 s = spltty(); 1728 lflag = tp->t_lflag; /* XXX ttypend() clobbers it */ 1729 } 1730 1731 /* 1732 * Hang process if it's in the background. 1733 */ 1734 if (isbackground(p, tp)) { 1735 splx(s); 1736 sx_slock(&proctree_lock); 1737 PROC_LOCK(p); 1738 if (SIGISMEMBER(p->p_sigacts->ps_sigignore, SIGTTIN) || 1739 SIGISMEMBER(td->td_sigmask, SIGTTIN) || 1740 (p->p_flag & P_PPWAIT) || p->p_pgrp->pg_jobc == 0) { 1741 PROC_UNLOCK(p); 1742 sx_sunlock(&proctree_lock); 1743 return (EIO); 1744 } 1745 pg = p->p_pgrp; 1746 PROC_UNLOCK(p); 1747 PGRP_LOCK(pg); 1748 sx_sunlock(&proctree_lock); 1749 pgsignal(pg, SIGTTIN, 1); 1750 PGRP_UNLOCK(pg); 1751 error = ttysleep(tp, &lbolt, TTIPRI | PCATCH, "ttybg2", 0); 1752 if (error) 1753 return (error); 1754 goto loop; 1755 } 1756 1757 if (ISSET(tp->t_state, TS_ZOMBIE)) { 1758 splx(s); 1759 return (0); /* EOF */ 1760 } 1761 1762 /* 1763 * If canonical, use the canonical queue, 1764 * else use the raw queue. 1765 * 1766 * (should get rid of clists...) 1767 */ 1768 qp = ISSET(lflag, ICANON) ? &tp->t_canq : &tp->t_rawq; 1769 1770 if (flag & IO_NDELAY) { 1771 if (qp->c_cc > 0) 1772 goto read; 1773 if (!ISSET(lflag, ICANON) && cc[VMIN] == 0) { 1774 splx(s); 1775 return (0); 1776 } 1777 splx(s); 1778 return (EWOULDBLOCK); 1779 } 1780 if (!ISSET(lflag, ICANON)) { 1781 int m = cc[VMIN]; 1782 long t = cc[VTIME]; 1783 struct timeval timecopy; 1784 1785 /* 1786 * Check each of the four combinations. 1787 * (m > 0 && t == 0) is the normal read case. 1788 * It should be fairly efficient, so we check that and its 1789 * companion case (m == 0 && t == 0) first. 1790 * For the other two cases, we compute the target sleep time 1791 * into slp. 1792 */ 1793 if (t == 0) { 1794 if (qp->c_cc < m) 1795 goto sleep; 1796 if (qp->c_cc > 0) 1797 goto read; 1798 1799 /* m, t and qp->c_cc are all 0. 0 is enough input. */ 1800 splx(s); 1801 return (0); 1802 } 1803 t *= 100000; /* time in us */ 1804#define diff(t1, t2) (((t1).tv_sec - (t2).tv_sec) * 1000000 + \ 1805 ((t1).tv_usec - (t2).tv_usec)) 1806 if (m > 0) { 1807 if (qp->c_cc <= 0) 1808 goto sleep; 1809 if (qp->c_cc >= m) 1810 goto read; 1811 getmicrotime(&timecopy); 1812 if (!has_stime) { 1813 /* first character, start timer */ 1814 has_stime = 1; 1815 stime = timecopy; 1816 slp = t; 1817 } else if (qp->c_cc > last_cc) { 1818 /* got a character, restart timer */ 1819 stime = timecopy; 1820 slp = t; 1821 } else { 1822 /* nothing, check expiration */ 1823 slp = t - diff(timecopy, stime); 1824 if (slp <= 0) 1825 goto read; 1826 } 1827 last_cc = qp->c_cc; 1828 } else { /* m == 0 */ 1829 if (qp->c_cc > 0) 1830 goto read; 1831 getmicrotime(&timecopy); 1832 if (!has_stime) { 1833 has_stime = 1; 1834 stime = timecopy; 1835 slp = t; 1836 } else { 1837 slp = t - diff(timecopy, stime); 1838 if (slp <= 0) { 1839 /* Timed out, but 0 is enough input. */ 1840 splx(s); 1841 return (0); 1842 } 1843 } 1844 } 1845#undef diff 1846 if (slp != 0) { 1847 struct timeval tv; /* XXX style bug. */ 1848 1849 tv.tv_sec = slp / 1000000; 1850 tv.tv_usec = slp % 1000000; 1851 slp = tvtohz(&tv); 1852 /* 1853 * XXX bad variable names. slp was the timeout in 1854 * usec. Now it is the timeout in ticks. 1855 */ 1856 } 1857 goto sleep; 1858 } 1859 if (qp->c_cc <= 0) { 1860sleep: 1861 /* 1862 * There is no input, or not enough input and we can block. 1863 */ 1864 error = ttysleep(tp, TSA_HUP_OR_INPUT(tp), TTIPRI | PCATCH, 1865 ISSET(tp->t_state, TS_CONNECTED) ? 1866 "ttyin" : "ttyhup", (int)slp); 1867 splx(s); 1868 if (error == EWOULDBLOCK) 1869 error = 0; 1870 else if (error) 1871 return (error); 1872 /* 1873 * XXX what happens if another process eats some input 1874 * while we are asleep (not just here)? It would be 1875 * safest to detect changes and reset our state variables 1876 * (has_stime and last_cc). 1877 */ 1878 slp = 0; 1879 goto loop; 1880 } 1881read: 1882 splx(s); 1883 /* 1884 * Input present, check for input mapping and processing. 1885 */ 1886 first = 1; 1887 if (ISSET(lflag, ICANON | ISIG)) 1888 goto slowcase; 1889 for (;;) { 1890 char ibuf[IBUFSIZ]; 1891 int icc; 1892 1893 icc = imin(uio->uio_resid, IBUFSIZ); 1894 icc = q_to_b(qp, ibuf, icc); 1895 if (icc <= 0) { 1896 if (first) 1897 goto loop; 1898 break; 1899 } 1900 error = uiomove(ibuf, icc, uio); 1901 /* 1902 * XXX if there was an error then we should ungetc() the 1903 * unmoved chars and reduce icc here. 1904 */ 1905 if (error) 1906 break; 1907 if (uio->uio_resid == 0) 1908 break; 1909 first = 0; 1910 } 1911 goto out; 1912slowcase: 1913 for (;;) { 1914 c = getc(qp); 1915 if (c < 0) { 1916 if (first) 1917 goto loop; 1918 break; 1919 } 1920 /* 1921 * delayed suspend (^Y) 1922 */ 1923 if (CCEQ(cc[VDSUSP], c) && 1924 ISSET(lflag, IEXTEN | ISIG) == (IEXTEN | ISIG)) { 1925 if (tp->t_pgrp != NULL) { 1926 PGRP_LOCK(tp->t_pgrp); 1927 pgsignal(tp->t_pgrp, SIGTSTP, 1); 1928 PGRP_UNLOCK(tp->t_pgrp); 1929 } 1930 if (first) { 1931 error = ttysleep(tp, &lbolt, TTIPRI | PCATCH, 1932 "ttybg3", 0); 1933 if (error) 1934 break; 1935 goto loop; 1936 } 1937 break; 1938 } 1939 /* 1940 * Interpret EOF only in canonical mode. 1941 */ 1942 if (CCEQ(cc[VEOF], c) && ISSET(lflag, ICANON)) 1943 break; 1944 /* 1945 * Give user character. 1946 */ 1947 error = ureadc(c, uio); 1948 if (error) 1949 /* XXX should ungetc(c, qp). */ 1950 break; 1951 if (uio->uio_resid == 0) 1952 break; 1953 /* 1954 * In canonical mode check for a "break character" 1955 * marking the end of a "line of input". 1956 */ 1957 if (ISSET(lflag, ICANON) && TTBREAKC(c, lflag)) 1958 break; 1959 first = 0; 1960 } 1961 1962out: 1963 /* 1964 * Look to unblock input now that (presumably) 1965 * the input queue has gone down. 1966 */ 1967 s = spltty(); 1968 if (ISSET(tp->t_state, TS_TBLOCK) && 1969 tp->t_rawq.c_cc + tp->t_canq.c_cc <= tp->t_ilowat) 1970 ttyunblock(tp); 1971 splx(s); 1972 1973 return (error); 1974} 1975 1976/* 1977 * Check the output queue on tp for space for a kernel message (from uprintf 1978 * or tprintf). Allow some space over the normal hiwater mark so we don't 1979 * lose messages due to normal flow control, but don't let the tty run amok. 1980 * Sleeps here are not interruptible, but we return prematurely if new signals 1981 * arrive. 1982 */ 1983int 1984ttycheckoutq(struct tty *tp, int wait) 1985{ 1986 int hiwat, s; 1987 sigset_t oldmask; 1988 struct thread *td; 1989 struct proc *p; 1990 1991 td = curthread; 1992 p = td->td_proc; 1993 hiwat = tp->t_ohiwat; 1994 SIGEMPTYSET(oldmask); 1995 s = spltty(); 1996 if (wait) { 1997 PROC_LOCK(p); 1998 oldmask = td->td_siglist; 1999 PROC_UNLOCK(p); 2000 } 2001 if (tp->t_outq.c_cc > hiwat + OBUFSIZ + 100) 2002 while (tp->t_outq.c_cc > hiwat) { 2003 ttstart(tp); 2004 if (tp->t_outq.c_cc <= hiwat) 2005 break; 2006 if (!wait) { 2007 splx(s); 2008 return (0); 2009 } 2010 PROC_LOCK(p); 2011 if (!SIGSETEQ(td->td_siglist, oldmask)) { 2012 PROC_UNLOCK(p); 2013 splx(s); 2014 return (0); 2015 } 2016 PROC_UNLOCK(p); 2017 SET(tp->t_state, TS_SO_OLOWAT); 2018 tsleep(TSA_OLOWAT(tp), PZERO - 1, "ttoutq", hz); 2019 } 2020 splx(s); 2021 return (1); 2022} 2023 2024/* 2025 * Process a write call on a tty device. 2026 */ 2027int 2028ttwrite(struct tty *tp, struct uio *uio, int flag) 2029{ 2030 char *cp = NULL; 2031 int cc, ce; 2032 struct thread *td; 2033 struct proc *p; 2034 int i, hiwat, cnt, error, s; 2035 char obuf[OBUFSIZ]; 2036 2037 hiwat = tp->t_ohiwat; 2038 cnt = uio->uio_resid; 2039 error = 0; 2040 cc = 0; 2041 td = curthread; 2042 p = td->td_proc; 2043loop: 2044 s = spltty(); 2045 if (ISSET(tp->t_state, TS_ZOMBIE)) { 2046 splx(s); 2047 if (uio->uio_resid == cnt) 2048 error = EIO; 2049 goto out; 2050 } 2051 if (!ISSET(tp->t_state, TS_CONNECTED)) { 2052 if (flag & IO_NDELAY) { 2053 splx(s); 2054 error = EWOULDBLOCK; 2055 goto out; 2056 } 2057 error = ttysleep(tp, TSA_CARR_ON(tp), TTIPRI | PCATCH, 2058 "ttywdcd", 0); 2059 splx(s); 2060 if (error) 2061 goto out; 2062 goto loop; 2063 } 2064 splx(s); 2065 /* 2066 * Hang the process if it's in the background. 2067 */ 2068 sx_slock(&proctree_lock); 2069 PROC_LOCK(p); 2070 if (isbackground(p, tp) && 2071 ISSET(tp->t_lflag, TOSTOP) && !(p->p_flag & P_PPWAIT) && 2072 !SIGISMEMBER(p->p_sigacts->ps_sigignore, SIGTTOU) && 2073 !SIGISMEMBER(td->td_sigmask, SIGTTOU)) { 2074 if (p->p_pgrp->pg_jobc == 0) { 2075 PROC_UNLOCK(p); 2076 sx_sunlock(&proctree_lock); 2077 error = EIO; 2078 goto out; 2079 } 2080 PROC_UNLOCK(p); 2081 PGRP_LOCK(p->p_pgrp); 2082 sx_sunlock(&proctree_lock); 2083 pgsignal(p->p_pgrp, SIGTTOU, 1); 2084 PGRP_UNLOCK(p->p_pgrp); 2085 error = ttysleep(tp, &lbolt, TTIPRI | PCATCH, "ttybg4", 0); 2086 if (error) 2087 goto out; 2088 goto loop; 2089 } else { 2090 PROC_UNLOCK(p); 2091 sx_sunlock(&proctree_lock); 2092 } 2093 /* 2094 * Process the user's data in at most OBUFSIZ chunks. Perform any 2095 * output translation. Keep track of high water mark, sleep on 2096 * overflow awaiting device aid in acquiring new space. 2097 */ 2098 while (uio->uio_resid > 0 || cc > 0) { 2099 if (ISSET(tp->t_lflag, FLUSHO)) { 2100 uio->uio_resid = 0; 2101 return (0); 2102 } 2103 if (tp->t_outq.c_cc > hiwat) 2104 goto ovhiwat; 2105 /* 2106 * Grab a hunk of data from the user, unless we have some 2107 * leftover from last time. 2108 */ 2109 if (cc == 0) { 2110 cc = imin(uio->uio_resid, OBUFSIZ); 2111 cp = obuf; 2112 error = uiomove(cp, cc, uio); 2113 if (error) { 2114 cc = 0; 2115 break; 2116 } 2117 } 2118 /* 2119 * If nothing fancy need be done, grab those characters we 2120 * can handle without any of ttyoutput's processing and 2121 * just transfer them to the output q. For those chars 2122 * which require special processing (as indicated by the 2123 * bits in char_type), call ttyoutput. After processing 2124 * a hunk of data, look for FLUSHO so ^O's will take effect 2125 * immediately. 2126 */ 2127 while (cc > 0) { 2128 if (!ISSET(tp->t_oflag, OPOST)) 2129 ce = cc; 2130 else { 2131 ce = cc - scanc((u_int)cc, (u_char *)cp, 2132 char_type, CCLASSMASK); 2133 /* 2134 * If ce is zero, then we're processing 2135 * a special character through ttyoutput. 2136 */ 2137 if (ce == 0) { 2138 tp->t_rocount = 0; 2139 if (ttyoutput(*cp, tp) >= 0) { 2140 /* No Clists, wait a bit. */ 2141 ttstart(tp); 2142 if (flag & IO_NDELAY) { 2143 error = EWOULDBLOCK; 2144 goto out; 2145 } 2146 error = ttysleep(tp, &lbolt, 2147 TTOPRI|PCATCH, 2148 "ttybf1", 0); 2149 if (error) 2150 goto out; 2151 goto loop; 2152 } 2153 cp++; 2154 cc--; 2155 if (ISSET(tp->t_lflag, FLUSHO) || 2156 tp->t_outq.c_cc > hiwat) 2157 goto ovhiwat; 2158 continue; 2159 } 2160 } 2161 /* 2162 * A bunch of normal characters have been found. 2163 * Transfer them en masse to the output queue and 2164 * continue processing at the top of the loop. 2165 * If there are any further characters in this 2166 * <= OBUFSIZ chunk, the first should be a character 2167 * requiring special handling by ttyoutput. 2168 */ 2169 tp->t_rocount = 0; 2170 i = b_to_q(cp, ce, &tp->t_outq); 2171 ce -= i; 2172 tp->t_column += ce; 2173 cp += ce, cc -= ce, tk_nout += ce; 2174 tp->t_outcc += ce; 2175 if (i > 0) { 2176 /* No Clists, wait a bit. */ 2177 ttstart(tp); 2178 if (flag & IO_NDELAY) { 2179 error = EWOULDBLOCK; 2180 goto out; 2181 } 2182 error = ttysleep(tp, &lbolt, TTOPRI | PCATCH, 2183 "ttybf2", 0); 2184 if (error) 2185 goto out; 2186 goto loop; 2187 } 2188 if (ISSET(tp->t_lflag, FLUSHO) || 2189 tp->t_outq.c_cc > hiwat) 2190 break; 2191 } 2192 ttstart(tp); 2193 } 2194out: 2195 /* 2196 * If cc is nonzero, we leave the uio structure inconsistent, as the 2197 * offset and iov pointers have moved forward, but it doesn't matter 2198 * (the call will either return short or restart with a new uio). 2199 */ 2200 uio->uio_resid += cc; 2201 return (error); 2202 2203ovhiwat: 2204 ttstart(tp); 2205 s = spltty(); 2206 /* 2207 * This can only occur if FLUSHO is set in t_lflag, 2208 * or if ttstart/oproc is synchronous (or very fast). 2209 */ 2210 if (tp->t_outq.c_cc <= hiwat) { 2211 splx(s); 2212 goto loop; 2213 } 2214 if (flag & IO_NDELAY) { 2215 splx(s); 2216 uio->uio_resid += cc; 2217 return (uio->uio_resid == cnt ? EWOULDBLOCK : 0); 2218 } 2219 SET(tp->t_state, TS_SO_OLOWAT); 2220 error = ttysleep(tp, TSA_OLOWAT(tp), TTOPRI | PCATCH, "ttywri", 2221 tp->t_timeout); 2222 splx(s); 2223 if (error == EWOULDBLOCK) 2224 error = EIO; 2225 if (error) 2226 goto out; 2227 goto loop; 2228} 2229 2230/* 2231 * Rubout one character from the rawq of tp 2232 * as cleanly as possible. 2233 */ 2234static void 2235ttyrub(int c, struct tty *tp) 2236{ 2237 char *cp; 2238 int savecol; 2239 int tabc, s; 2240 2241 if (!ISSET(tp->t_lflag, ECHO) || ISSET(tp->t_lflag, EXTPROC)) 2242 return; 2243 CLR(tp->t_lflag, FLUSHO); 2244 if (ISSET(tp->t_lflag, ECHOE)) { 2245 if (tp->t_rocount == 0) { 2246 /* 2247 * Screwed by ttwrite; retype 2248 */ 2249 ttyretype(tp); 2250 return; 2251 } 2252 if (c == ('\t' | TTY_QUOTE) || c == ('\n' | TTY_QUOTE)) 2253 ttyrubo(tp, 2); 2254 else { 2255 CLR(c, ~TTY_CHARMASK); 2256 switch (CCLASS(c)) { 2257 case ORDINARY: 2258 ttyrubo(tp, 1); 2259 break; 2260 case BACKSPACE: 2261 case CONTROL: 2262 case NEWLINE: 2263 case RETURN: 2264 case VTAB: 2265 if (ISSET(tp->t_lflag, ECHOCTL)) 2266 ttyrubo(tp, 2); 2267 break; 2268 case TAB: 2269 if (tp->t_rocount < tp->t_rawq.c_cc) { 2270 ttyretype(tp); 2271 return; 2272 } 2273 s = spltty(); 2274 savecol = tp->t_column; 2275 SET(tp->t_state, TS_CNTTB); 2276 SET(tp->t_lflag, FLUSHO); 2277 tp->t_column = tp->t_rocol; 2278 cp = tp->t_rawq.c_cf; 2279 if (cp) 2280 tabc = *cp; /* XXX FIX NEXTC */ 2281 for (; cp; cp = nextc(&tp->t_rawq, cp, &tabc)) 2282 ttyecho(tabc, tp); 2283 CLR(tp->t_lflag, FLUSHO); 2284 CLR(tp->t_state, TS_CNTTB); 2285 splx(s); 2286 2287 /* savecol will now be length of the tab. */ 2288 savecol -= tp->t_column; 2289 tp->t_column += savecol; 2290 if (savecol > 8) 2291 savecol = 8; /* overflow screw */ 2292 while (--savecol >= 0) 2293 (void)ttyoutput('\b', tp); 2294 break; 2295 default: /* XXX */ 2296#define PANICSTR "ttyrub: would panic c = %d, val = %d\n" 2297 (void)printf(PANICSTR, c, CCLASS(c)); 2298#ifdef notdef 2299 panic(PANICSTR, c, CCLASS(c)); 2300#endif 2301 } 2302 } 2303 } else if (ISSET(tp->t_lflag, ECHOPRT)) { 2304 if (!ISSET(tp->t_state, TS_ERASE)) { 2305 SET(tp->t_state, TS_ERASE); 2306 (void)ttyoutput('\\', tp); 2307 } 2308 ttyecho(c, tp); 2309 } else { 2310 ttyecho(tp->t_cc[VERASE], tp); 2311 /* 2312 * This code may be executed not only when an ERASE key 2313 * is pressed, but also when ^U (KILL) or ^W (WERASE) are. 2314 * So, I didn't think it was worthwhile to pass the extra 2315 * information (which would need an extra parameter, 2316 * changing every call) needed to distinguish the ERASE2 2317 * case from the ERASE. 2318 */ 2319 } 2320 --tp->t_rocount; 2321} 2322 2323/* 2324 * Back over cnt characters, erasing them. 2325 */ 2326static void 2327ttyrubo(struct tty *tp, int cnt) 2328{ 2329 2330 while (cnt-- > 0) { 2331 (void)ttyoutput('\b', tp); 2332 (void)ttyoutput(' ', tp); 2333 (void)ttyoutput('\b', tp); 2334 } 2335} 2336 2337/* 2338 * ttyretype -- 2339 * Reprint the rawq line. Note, it is assumed that c_cc has already 2340 * been checked. 2341 */ 2342static void 2343ttyretype(struct tty *tp) 2344{ 2345 char *cp; 2346 int s, c; 2347 2348 /* Echo the reprint character. */ 2349 if (tp->t_cc[VREPRINT] != _POSIX_VDISABLE) 2350 ttyecho(tp->t_cc[VREPRINT], tp); 2351 2352 (void)ttyoutput('\n', tp); 2353 2354 /* 2355 * XXX 2356 * FIX: NEXTC IS BROKEN - DOESN'T CHECK QUOTE 2357 * BIT OF FIRST CHAR. 2358 */ 2359 s = spltty(); 2360 for (cp = tp->t_canq.c_cf, c = (cp != NULL ? *cp : 0); 2361 cp != NULL; cp = nextc(&tp->t_canq, cp, &c)) 2362 ttyecho(c, tp); 2363 for (cp = tp->t_rawq.c_cf, c = (cp != NULL ? *cp : 0); 2364 cp != NULL; cp = nextc(&tp->t_rawq, cp, &c)) 2365 ttyecho(c, tp); 2366 CLR(tp->t_state, TS_ERASE); 2367 splx(s); 2368 2369 tp->t_rocount = tp->t_rawq.c_cc; 2370 tp->t_rocol = 0; 2371} 2372 2373/* 2374 * Echo a typed character to the terminal. 2375 */ 2376static void 2377ttyecho(int c, struct tty *tp) 2378{ 2379 2380 if (!ISSET(tp->t_state, TS_CNTTB)) 2381 CLR(tp->t_lflag, FLUSHO); 2382 if ((!ISSET(tp->t_lflag, ECHO) && 2383 (c != '\n' || !ISSET(tp->t_lflag, ECHONL))) || 2384 ISSET(tp->t_lflag, EXTPROC)) 2385 return; 2386 if (ISSET(tp->t_lflag, ECHOCTL) && 2387 ((ISSET(c, TTY_CHARMASK) <= 037 && c != '\t' && c != '\n') || 2388 ISSET(c, TTY_CHARMASK) == 0177)) { 2389 (void)ttyoutput('^', tp); 2390 CLR(c, ~TTY_CHARMASK); 2391 if (c == 0177) 2392 c = '?'; 2393 else 2394 c += 'A' - 1; 2395 } 2396 (void)ttyoutput(c, tp); 2397} 2398 2399/* 2400 * Wake up any readers on a tty. 2401 */ 2402void 2403ttwakeup(struct tty *tp) 2404{ 2405 2406 if (SEL_WAITING(&tp->t_rsel)) 2407 selwakeuppri(&tp->t_rsel, TTIPRI); 2408 if (ISSET(tp->t_state, TS_ASYNC) && tp->t_sigio != NULL) 2409 pgsigio(&tp->t_sigio, SIGIO, (tp->t_session != NULL)); 2410 wakeup(TSA_HUP_OR_INPUT(tp)); 2411 KNOTE_UNLOCKED(&tp->t_rsel.si_note, 0); 2412} 2413 2414/* 2415 * Wake up any writers on a tty. 2416 */ 2417void 2418ttwwakeup(struct tty *tp) 2419{ 2420 2421 if (SEL_WAITING(&tp->t_wsel) && tp->t_outq.c_cc <= tp->t_olowat) 2422 selwakeuppri(&tp->t_wsel, TTOPRI); 2423 if (ISSET(tp->t_state, TS_ASYNC) && tp->t_sigio != NULL) 2424 pgsigio(&tp->t_sigio, SIGIO, (tp->t_session != NULL)); 2425 if (ISSET(tp->t_state, TS_BUSY | TS_SO_OCOMPLETE) == 2426 TS_SO_OCOMPLETE && tp->t_outq.c_cc == 0) { 2427 CLR(tp->t_state, TS_SO_OCOMPLETE); 2428 wakeup(TSA_OCOMPLETE(tp)); 2429 } 2430 if (ISSET(tp->t_state, TS_SO_OLOWAT) && 2431 tp->t_outq.c_cc <= tp->t_olowat) { 2432 CLR(tp->t_state, TS_SO_OLOWAT); 2433 wakeup(TSA_OLOWAT(tp)); 2434 } 2435 KNOTE_UNLOCKED(&tp->t_wsel.si_note, 0); 2436} 2437 2438/* 2439 * Look up a code for a specified speed in a conversion table; 2440 * used by drivers to map software speed values to hardware parameters. 2441 */ 2442int 2443ttspeedtab(int speed, struct speedtab *table) 2444{ 2445 2446 for ( ; table->sp_speed != -1; table++) 2447 if (table->sp_speed == speed) 2448 return (table->sp_code); 2449 return (-1); 2450} 2451 2452/* 2453 * Set input and output watermarks and buffer sizes. For input, the 2454 * high watermark is about one second's worth of input above empty, the 2455 * low watermark is slightly below high water, and the buffer size is a 2456 * driver-dependent amount above high water. For output, the watermarks 2457 * are near the ends of the buffer, with about 1 second's worth of input 2458 * between them. All this only applies to the standard line discipline. 2459 */ 2460void 2461ttsetwater(struct tty *tp) 2462{ 2463 int cps, ttmaxhiwat, x; 2464 2465 /* Input. */ 2466 clist_alloc_cblocks(&tp->t_canq, TTYHOG, 512); 2467 switch (tp->t_ispeedwat) { 2468 case (speed_t)-1: 2469 cps = tp->t_ispeed / 10; 2470 break; 2471 case 0: 2472 /* 2473 * This case is for old drivers that don't know about 2474 * t_ispeedwat. Arrange for them to get the old buffer 2475 * sizes and watermarks. 2476 */ 2477 cps = TTYHOG - 2 * 256; 2478 tp->t_ififosize = 2 * 256; 2479 break; 2480 default: 2481 cps = tp->t_ispeedwat / 10; 2482 break; 2483 } 2484 tp->t_ihiwat = cps; 2485 tp->t_ilowat = 7 * cps / 8; 2486 x = cps + tp->t_ififosize; 2487 clist_alloc_cblocks(&tp->t_rawq, x, x); 2488 2489 /* Output. */ 2490 switch (tp->t_ospeedwat) { 2491 case (speed_t)-1: 2492 cps = tp->t_ospeed / 10; 2493 ttmaxhiwat = 2 * TTMAXHIWAT; 2494 break; 2495 case 0: 2496 cps = tp->t_ospeed / 10; 2497 ttmaxhiwat = TTMAXHIWAT; 2498 break; 2499 default: 2500 cps = tp->t_ospeedwat / 10; 2501 ttmaxhiwat = 8 * TTMAXHIWAT; 2502 break; 2503 } 2504#define CLAMP(x, h, l) ((x) > h ? h : ((x) < l) ? l : (x)) 2505 tp->t_olowat = x = CLAMP(cps / 2, TTMAXLOWAT, TTMINLOWAT); 2506 x += cps; 2507 x = CLAMP(x, ttmaxhiwat, TTMINHIWAT); /* XXX clamps are too magic */ 2508 tp->t_ohiwat = roundup(x, CBSIZE); /* XXX for compat */ 2509 x = imax(tp->t_ohiwat, TTMAXHIWAT); /* XXX for compat/safety */ 2510 x += OBUFSIZ + 100; 2511 clist_alloc_cblocks(&tp->t_outq, x, x); 2512#undef CLAMP 2513} 2514 2515/* 2516 * Report on state of foreground process group. 2517 */ 2518void 2519ttyinfo(struct tty *tp) 2520{ 2521 struct timeval utime, stime; 2522 struct proc *p, *pick; 2523 struct thread *td; 2524 const char *stateprefix, *state; 2525 long rss; 2526 int load, pctcpu; 2527 pid_t pid; 2528 char comm[MAXCOMLEN + 1]; 2529 2530 if (ttycheckoutq(tp,0) == 0) 2531 return; 2532 2533 /* Print load average. */ 2534 load = (averunnable.ldavg[0] * 100 + FSCALE / 2) >> FSHIFT; 2535 ttyprintf(tp, "load: %d.%02d ", load / 100, load % 100); 2536 2537 /* 2538 * On return following a ttyprintf(), we set tp->t_rocount to 0 so 2539 * that pending input will be retyped on BS. 2540 */ 2541 if (tp->t_session == NULL) { 2542 ttyprintf(tp, "not a controlling terminal\n"); 2543 tp->t_rocount = 0; 2544 return; 2545 } 2546 if (tp->t_pgrp == NULL) { 2547 ttyprintf(tp, "no foreground process group\n"); 2548 tp->t_rocount = 0; 2549 return; 2550 } 2551 PGRP_LOCK(tp->t_pgrp); 2552 if (LIST_EMPTY(&tp->t_pgrp->pg_members)) { 2553 PGRP_UNLOCK(tp->t_pgrp); 2554 ttyprintf(tp, "empty foreground process group\n"); 2555 tp->t_rocount = 0; 2556 return; 2557 } 2558 2559 /* 2560 * Pick the most interesting process and copy some of its 2561 * state for printing later. sched_lock must be held for 2562 * most parts of this. Holding it throughout is simplest 2563 * and prevents even unimportant inconsistencies in the 2564 * copy of the state, but may increase interrupt latency 2565 * too much. 2566 */ 2567 pick = NULL; 2568 mtx_lock_spin(&sched_lock); 2569 LIST_FOREACH(p, &tp->t_pgrp->pg_members, p_pglist) 2570 if (proc_compare(pick, p)) 2571 pick = p; 2572 2573 td = FIRST_THREAD_IN_PROC(pick); /* XXXKSE */ 2574#if 0 2575 KASSERT(td != NULL, ("ttyinfo: no thread")); 2576#else 2577 if (td == NULL) { 2578 mtx_unlock_spin(&sched_lock); 2579 PGRP_UNLOCK(tp->t_pgrp); 2580 ttyprintf(tp, "foreground process without thread\n"); 2581 tp->t_rocount = 0; 2582 return; 2583 } 2584#endif 2585 stateprefix = ""; 2586 if (TD_IS_RUNNING(td)) 2587 state = "running"; 2588 else if (TD_ON_RUNQ(td) || TD_CAN_RUN(td)) 2589 state = "runnable"; 2590 else if (TD_IS_SLEEPING(td)) { 2591 /* XXX: If we're sleeping, are we ever not in a queue? */ 2592 if (TD_ON_SLEEPQ(td)) 2593 state = td->td_wmesg; 2594 else 2595 state = "sleeping without queue"; 2596 } else if (TD_ON_LOCK(td)) { 2597 state = td->td_lockname; 2598 stateprefix = "*"; 2599 } else if (TD_IS_SUSPENDED(td)) 2600 state = "suspended"; 2601 else if (TD_AWAITING_INTR(td)) 2602 state = "intrwait"; 2603 else 2604 state = "unknown"; 2605 pctcpu = (sched_pctcpu(td) * 10000 + FSCALE / 2) >> FSHIFT; 2606 if (pick->p_state == PRS_NEW || pick->p_state == PRS_ZOMBIE) 2607 rss = 0; 2608 else 2609 rss = pgtok(vmspace_resident_count(pick->p_vmspace)); 2610 mtx_unlock_spin(&sched_lock); 2611 PROC_LOCK(pick); 2612 PGRP_UNLOCK(tp->t_pgrp); 2613 calcru(pick, &utime, &stime); 2614 pid = pick->p_pid; 2615 bcopy(pick->p_comm, comm, sizeof(comm)); 2616 PROC_UNLOCK(pick); 2617 2618 /* Print command, pid, state, utime, stime, %cpu, and rss. */ 2619 ttyprintf(tp, 2620 " cmd: %s %d [%s%s] %ld.%02ldu %ld.%02lds %d%% %ldk\n", 2621 comm, pid, stateprefix, state, 2622 (long)utime.tv_sec, utime.tv_usec / 10000, 2623 (long)stime.tv_sec, stime.tv_usec / 10000, 2624 pctcpu / 100, rss); 2625 tp->t_rocount = 0; 2626} 2627 2628/* 2629 * Returns 1 if p2 is "better" than p1 2630 * 2631 * The algorithm for picking the "interesting" process is thus: 2632 * 2633 * 1) Only foreground processes are eligible - implied. 2634 * 2) Runnable processes are favored over anything else. The runner 2635 * with the highest cpu utilization is picked (p_estcpu). Ties are 2636 * broken by picking the highest pid. 2637 * 3) The sleeper with the shortest sleep time is next. With ties, 2638 * we pick out just "short-term" sleepers (P_SINTR == 0). 2639 * 4) Further ties are broken by picking the highest pid. 2640 */ 2641#define ISRUN(p, val) \ 2642do { \ 2643 struct thread *td; \ 2644 val = 0; \ 2645 FOREACH_THREAD_IN_PROC(p, td) { \ 2646 if (TD_ON_RUNQ(td) || \ 2647 TD_IS_RUNNING(td)) { \ 2648 val = 1; \ 2649 break; \ 2650 } \ 2651 } \ 2652} while (0) 2653 2654#define TESTAB(a, b) ((a)<<1 | (b)) 2655#define ONLYA 2 2656#define ONLYB 1 2657#define BOTH 3 2658 2659static int 2660proc_compare(struct proc *p1, struct proc *p2) 2661{ 2662 2663 int esta, estb; 2664 struct ksegrp *kg; 2665 mtx_assert(&sched_lock, MA_OWNED); 2666 if (p1 == NULL) 2667 return (1); 2668 2669 ISRUN(p1, esta); 2670 ISRUN(p2, estb); 2671 2672 /* 2673 * see if at least one of them is runnable 2674 */ 2675 switch (TESTAB(esta, estb)) { 2676 case ONLYA: 2677 return (0); 2678 case ONLYB: 2679 return (1); 2680 case BOTH: 2681 /* 2682 * tie - favor one with highest recent cpu utilization 2683 */ 2684 esta = estb = 0; 2685 FOREACH_KSEGRP_IN_PROC(p1,kg) { 2686 esta += kg->kg_estcpu; 2687 } 2688 FOREACH_KSEGRP_IN_PROC(p2,kg) { 2689 estb += kg->kg_estcpu; 2690 } 2691 if (estb > esta) 2692 return (1); 2693 if (esta > estb) 2694 return (0); 2695 return (p2->p_pid > p1->p_pid); /* tie - return highest pid */ 2696 } 2697 /* 2698 * weed out zombies 2699 */ 2700 switch (TESTAB(p1->p_state == PRS_ZOMBIE, p2->p_state == PRS_ZOMBIE)) { 2701 case ONLYA: 2702 return (1); 2703 case ONLYB: 2704 return (0); 2705 case BOTH: 2706 return (p2->p_pid > p1->p_pid); /* tie - return highest pid */ 2707 } 2708 2709#if 0 /* XXXKSE */ 2710 /* 2711 * pick the one with the smallest sleep time 2712 */ 2713 if (p2->p_slptime > p1->p_slptime) 2714 return (0); 2715 if (p1->p_slptime > p2->p_slptime) 2716 return (1); 2717 /* 2718 * favor one sleeping in a non-interruptible sleep 2719 */ 2720 if (p1->p_sflag & PS_SINTR && (p2->p_sflag & PS_SINTR) == 0) 2721 return (1); 2722 if (p2->p_sflag & PS_SINTR && (p1->p_sflag & PS_SINTR) == 0) 2723 return (0); 2724#endif 2725 return (p2->p_pid > p1->p_pid); /* tie - return highest pid */ 2726} 2727 2728/* 2729 * Output char to tty; console putchar style. 2730 */ 2731int 2732tputchar(int c, struct tty *tp) 2733{ 2734 int s; 2735 2736 s = spltty(); 2737 if (!ISSET(tp->t_state, TS_CONNECTED)) { 2738 splx(s); 2739 return (-1); 2740 } 2741 if (c == '\n') 2742 (void)ttyoutput('\r', tp); 2743 (void)ttyoutput(c, tp); 2744 ttstart(tp); 2745 splx(s); 2746 return (0); 2747} 2748 2749/* 2750 * Sleep on chan, returning ERESTART if tty changed while we napped and 2751 * returning any errors (e.g. EINTR/EWOULDBLOCK) reported by tsleep. If 2752 * the tty is revoked, restarting a pending call will redo validation done 2753 * at the start of the call. 2754 */ 2755int 2756ttysleep(struct tty *tp, void *chan, int pri, char *wmesg, int timo) 2757{ 2758 int error; 2759 int gen; 2760 2761 gen = tp->t_gen; 2762 error = tsleep(chan, pri, wmesg, timo); 2763 if (tp->t_state & TS_GONE) 2764 return (ENXIO); 2765 if (error) 2766 return (error); 2767 return (tp->t_gen == gen ? 0 : ERESTART); 2768} 2769 2770/* 2771 * Gain a reference to a TTY 2772 */ 2773int 2774ttyref(struct tty *tp) 2775{ 2776 int i; 2777 2778 mtx_lock(&tp->t_mtx); 2779 KASSERT(tp->t_refcnt > 0, 2780 ("ttyref(): tty refcnt is %d (%s)", 2781 tp->t_refcnt, tp->t_dev != NULL ? devtoname(tp->t_dev) : "??")); 2782 i = ++tp->t_refcnt; 2783 mtx_unlock(&tp->t_mtx); 2784 return (i); 2785} 2786 2787/* 2788 * Drop a reference to a TTY. 2789 * When reference count drops to zero, we free it. 2790 */ 2791int 2792ttyrel(struct tty *tp) 2793{ 2794 int i; 2795 2796 mtx_lock(&tty_list_mutex); 2797 mtx_lock(&tp->t_mtx); 2798 KASSERT(tp->t_refcnt > 0, 2799 ("ttyrel(): tty refcnt is %d (%s)", 2800 tp->t_refcnt, tp->t_dev != NULL ? devtoname(tp->t_dev) : "??")); 2801 i = --tp->t_refcnt; 2802 if (i != 0) { 2803 mtx_unlock(&tp->t_mtx); 2804 mtx_unlock(&tty_list_mutex); 2805 return (i); 2806 } 2807 TAILQ_REMOVE(&tty_list, tp, t_list); 2808 mtx_unlock(&tp->t_mtx); 2809 mtx_unlock(&tty_list_mutex); 2810 knlist_destroy(&tp->t_rsel.si_note); 2811 knlist_destroy(&tp->t_wsel.si_note); 2812 mtx_destroy(&tp->t_mtx); 2813 free(tp, M_TTYS); 2814 return (i); 2815} 2816 2817/* 2818 * Allocate a tty struct. Clists in the struct will be allocated by 2819 * tty_open(). 2820 */ 2821struct tty * 2822ttyalloc() 2823{ 2824 struct tty *tp; 2825 2826 tp = malloc(sizeof *tp, M_TTYS, M_WAITOK | M_ZERO); 2827 mtx_init(&tp->t_mtx, "tty", NULL, MTX_DEF); 2828 2829 /* 2830 * Set up the initial state 2831 */ 2832 tp->t_refcnt = 1; 2833 tp->t_timeout = -1; 2834 tp->t_dtr_wait = 3 * hz; 2835 2836 ttyinitmode(tp, 0, 0); 2837 bcopy(ttydefchars, tp->t_init_in.c_cc, sizeof tp->t_init_in.c_cc); 2838 2839 /* Make callout the same as callin */ 2840 tp->t_init_out = tp->t_init_in; 2841 2842 mtx_lock(&tty_list_mutex); 2843 TAILQ_INSERT_TAIL(&tty_list, tp, t_list); 2844 mtx_unlock(&tty_list_mutex); 2845 knlist_init(&tp->t_rsel.si_note, &tp->t_mtx, NULL, NULL, NULL); 2846 knlist_init(&tp->t_wsel.si_note, &tp->t_mtx, NULL, NULL, NULL); 2847 return (tp); 2848} 2849 2850static void 2851ttypurge(struct cdev *dev) 2852{ 2853 2854 if (dev->si_tty == NULL) 2855 return; 2856 ttygone(dev->si_tty); 2857} 2858 2859/* 2860 * ttycreate() 2861 * 2862 * Create the device entries for this tty thereby opening it for business. 2863 * 2864 * The flags argument controls if "cua" units are created. 2865 * 2866 * The t_sc filed is copied to si_drv1 in the created cdevs. This 2867 * is particularly important for ->t_cioctl() users. 2868 * 2869 * XXX: implement the init and lock devices by cloning. 2870 */ 2871 2872int 2873ttycreate(struct tty *tp, int flags, const char *fmt, ...) 2874{ 2875 char namebuf[SPECNAMELEN - 3]; /* XXX space for "tty" */ 2876 struct cdevsw *csw = NULL; 2877 int unit = 0; 2878 va_list ap; 2879 struct cdev *cp; 2880 int i, minor, sminor, sunit; 2881 2882 mtx_assert(&Giant, MA_OWNED); 2883 2884 if (tty_unit == NULL) 2885 tty_unit = new_unrhdr(0, 0xffff, NULL); 2886 2887 sunit = alloc_unr(tty_unit); 2888 tp->t_devunit = sunit; 2889 2890 if (csw == NULL) { 2891 csw = &tty_cdevsw; 2892 unit = sunit; 2893 } 2894 KASSERT(csw->d_purge == NULL || csw->d_purge == ttypurge, 2895 ("tty should not have d_purge")); 2896 2897 csw->d_purge = ttypurge; 2898 2899 minor = unit2minor(unit); 2900 sminor = unit2minor(sunit); 2901 va_start(ap, fmt); 2902 i = vsnrprintf(namebuf, sizeof namebuf, 32, fmt, ap); 2903 va_end(ap); 2904 KASSERT(i < sizeof namebuf, ("Too long tty name (%s)", namebuf)); 2905 2906 cp = make_dev(csw, minor, 2907 UID_ROOT, GID_WHEEL, 0600, "tty%s", namebuf); 2908 tp->t_dev = cp; 2909 tp->t_mdev = cp; 2910 cp->si_tty = tp; 2911 cp->si_drv1 = tp->t_sc; 2912 2913 cp = make_dev(&ttys_cdevsw, sminor | MINOR_INIT, 2914 UID_ROOT, GID_WHEEL, 0600, "tty%s.init", namebuf); 2915 dev_depends(tp->t_dev, cp); 2916 cp->si_drv1 = tp->t_sc; 2917 cp->si_drv2 = &tp->t_init_in; 2918 cp->si_tty = tp; 2919 2920 cp = make_dev(&ttys_cdevsw, sminor | MINOR_LOCK, 2921 UID_ROOT, GID_WHEEL, 0600, "tty%s.lock", namebuf); 2922 dev_depends(tp->t_dev, cp); 2923 cp->si_drv1 = tp->t_sc; 2924 cp->si_drv2 = &tp->t_lock_in; 2925 cp->si_tty = tp; 2926 2927 if (flags & TS_CALLOUT) { 2928 cp = make_dev(csw, minor | MINOR_CALLOUT, 2929 UID_UUCP, GID_DIALER, 0660, "cua%s", namebuf); 2930 dev_depends(tp->t_dev, cp); 2931 cp->si_drv1 = tp->t_sc; 2932 cp->si_tty = tp; 2933 2934 cp = make_dev(&ttys_cdevsw, sminor | MINOR_CALLOUT | MINOR_INIT, 2935 UID_UUCP, GID_DIALER, 0660, "cua%s.init", namebuf); 2936 dev_depends(tp->t_dev, cp); 2937 cp->si_drv1 = tp->t_sc; 2938 cp->si_drv2 = &tp->t_init_out; 2939 cp->si_tty = tp; 2940 2941 cp = make_dev(&ttys_cdevsw, sminor | MINOR_CALLOUT | MINOR_LOCK, 2942 UID_UUCP, GID_DIALER, 0660, "cua%s.lock", namebuf); 2943 dev_depends(tp->t_dev, cp); 2944 cp->si_drv1 = tp->t_sc; 2945 cp->si_drv2 = &tp->t_lock_out; 2946 cp->si_tty = tp; 2947 } 2948 2949 return (0); 2950} 2951 2952/* 2953 * This function is called when the hardware disappears. We set a flag 2954 * and wake up stuff so all sleeping threads will notice. 2955 */ 2956void 2957ttygone(struct tty *tp) 2958{ 2959 2960 tp->t_state |= TS_GONE; 2961 wakeup(&tp->t_dtr_wait); 2962 wakeup(TSA_CARR_ON(tp)); 2963 wakeup(TSA_HUP_OR_INPUT(tp)); 2964 wakeup(TSA_OCOMPLETE(tp)); 2965 wakeup(TSA_OLOWAT(tp)); 2966 tt_purge(tp); 2967} 2968 2969/* 2970 * ttyfree() 2971 * 2972 * Called when the driver is ready to free the tty structure. 2973 * 2974 * XXX: This shall sleep until all threads have left the driver. 2975 */ 2976 2977void 2978ttyfree(struct tty *tp) 2979{ 2980 u_int unit; 2981 2982 mtx_assert(&Giant, MA_OWNED); 2983 ttygone(tp); 2984 unit = tp->t_devunit; 2985 destroy_dev(tp->t_mdev); 2986 free_unr(tty_unit, unit); 2987} 2988 2989static int 2990sysctl_kern_ttys(SYSCTL_HANDLER_ARGS) 2991{ 2992 struct tty *tp, *tp2; 2993 struct xtty xt; 2994 int error; 2995 2996 error = 0; 2997 mtx_lock(&tty_list_mutex); 2998 tp = TAILQ_FIRST(&tty_list); 2999 if (tp != NULL) 3000 ttyref(tp); 3001 mtx_unlock(&tty_list_mutex); 3002 while (tp != NULL) { 3003 bzero(&xt, sizeof xt); 3004 xt.xt_size = sizeof xt; 3005#define XT_COPY(field) xt.xt_##field = tp->t_##field 3006 xt.xt_rawcc = tp->t_rawq.c_cc; 3007 xt.xt_cancc = tp->t_canq.c_cc; 3008 xt.xt_outcc = tp->t_outq.c_cc; 3009 XT_COPY(line); 3010 if (tp->t_dev != NULL) 3011 xt.xt_dev = dev2udev(tp->t_dev); 3012 XT_COPY(state); 3013 XT_COPY(flags); 3014 XT_COPY(timeout); 3015 if (tp->t_pgrp != NULL) 3016 xt.xt_pgid = tp->t_pgrp->pg_id; 3017 if (tp->t_session != NULL) 3018 xt.xt_sid = tp->t_session->s_sid; 3019 XT_COPY(termios); 3020 XT_COPY(winsize); 3021 XT_COPY(column); 3022 XT_COPY(rocount); 3023 XT_COPY(rocol); 3024 XT_COPY(ififosize); 3025 XT_COPY(ihiwat); 3026 XT_COPY(ilowat); 3027 XT_COPY(ispeedwat); 3028 XT_COPY(ohiwat); 3029 XT_COPY(olowat); 3030 XT_COPY(ospeedwat); 3031#undef XT_COPY 3032 error = SYSCTL_OUT(req, &xt, sizeof xt); 3033 if (error != 0) { 3034 ttyrel(tp); 3035 return (error); 3036 } 3037 mtx_lock(&tty_list_mutex); 3038 tp2 = TAILQ_NEXT(tp, t_list); 3039 if (tp2 != NULL) 3040 ttyref(tp2); 3041 mtx_unlock(&tty_list_mutex); 3042 ttyrel(tp); 3043 tp = tp2; 3044 } 3045 return (0); 3046} 3047 3048SYSCTL_PROC(_kern, OID_AUTO, ttys, CTLTYPE_OPAQUE|CTLFLAG_RD, 3049 0, 0, sysctl_kern_ttys, "S,xtty", "All ttys"); 3050SYSCTL_LONG(_kern, OID_AUTO, tty_nin, CTLFLAG_RD, 3051 &tk_nin, 0, "Total TTY in characters"); 3052SYSCTL_LONG(_kern, OID_AUTO, tty_nout, CTLFLAG_RD, 3053 &tk_nout, 0, "Total TTY out characters"); 3054 3055void 3056nottystop(struct tty *tp, int rw) 3057{ 3058 3059 return; 3060} 3061 3062int 3063ttyopen(struct cdev *dev, int flag, int mode, struct thread *td) 3064{ 3065 int error; 3066 int s; 3067 struct tty *tp; 3068 3069 tp = dev->si_tty; 3070 s = spltty(); 3071 /* 3072 * We jump to this label after all non-interrupted sleeps to pick 3073 * up any changes of the device state. 3074 */ 3075open_top: 3076 if (tp->t_state & TS_GONE) 3077 return (ENXIO); 3078 error = ttydtrwaitsleep(tp); 3079 if (error) 3080 goto out; 3081 if (tp->t_state & TS_ISOPEN) { 3082 /* 3083 * The device is open, so everything has been initialized. 3084 * Handle conflicts. 3085 */ 3086 if (ISCALLOUT(dev) && !tp->t_actout) 3087 return (EBUSY); 3088 if (tp->t_actout && !ISCALLOUT(dev)) { 3089 if (flag & O_NONBLOCK) 3090 return (EBUSY); 3091 error = tsleep(&tp->t_actout, 3092 TTIPRI | PCATCH, "ttybi", 0); 3093 if (error != 0 || (tp->t_flags & TS_GONE)) 3094 goto out; 3095 goto open_top; 3096 } 3097 if (tp->t_state & TS_XCLUDE && suser(td)) 3098 return (EBUSY); 3099 } else { 3100 /* 3101 * The device isn't open, so there are no conflicts. 3102 * Initialize it. Initialization is done twice in many 3103 * cases: to preempt sleeping callin opens if we are 3104 * callout, and to complete a callin open after DCD rises. 3105 */ 3106 tp->t_termios = ISCALLOUT(dev) ? tp->t_init_out : tp->t_init_in; 3107 tp->t_cflag = tp->t_termios.c_cflag; 3108 if (tp->t_modem != NULL) 3109 tt_modem(tp, SER_DTR | SER_RTS, 0); 3110 ++tp->t_wopeners; 3111 error = tt_param(tp, &tp->t_termios); 3112 --tp->t_wopeners; 3113 if (error == 0) 3114 error = tt_open(tp, dev); 3115 if (error != 0) 3116 goto out; 3117 if (ISCALLOUT(dev) || (tt_modem(tp, 0, 0) & SER_DCD)) 3118 ttyld_modem(tp, 1); 3119 } 3120 /* 3121 * Wait for DCD if necessary. 3122 */ 3123 if (!(tp->t_state & TS_CARR_ON) && !ISCALLOUT(dev) 3124 && !(tp->t_cflag & CLOCAL) && !(flag & O_NONBLOCK)) { 3125 ++tp->t_wopeners; 3126 error = tsleep(TSA_CARR_ON(tp), TTIPRI | PCATCH, "ttydcd", 0); 3127 --tp->t_wopeners; 3128 if (error != 0 || (tp->t_state & TS_GONE)) 3129 goto out; 3130 goto open_top; 3131 } 3132 error = ttyld_open(tp, dev); 3133 ttyldoptim(tp); 3134 if (tp->t_state & TS_ISOPEN && ISCALLOUT(dev)) 3135 tp->t_actout = TRUE; 3136out: 3137 splx(s); 3138 if (!(tp->t_state & TS_ISOPEN) && tp->t_wopeners == 0) 3139 tt_close(tp); 3140 return (error); 3141} 3142 3143int 3144ttyclose(struct cdev *dev, int flag, int mode, struct thread *td) 3145{ 3146 struct tty *tp; 3147 3148 tp = dev->si_tty; 3149 ttyld_close(tp, flag); 3150 ttyldoptim(tp); 3151 tt_close(tp); 3152 tp->t_do_timestamp = 0; 3153 if (tp->t_pps != NULL) 3154 tp->t_pps->ppsparam.mode = 0; 3155 tty_close(tp); 3156 return (0); 3157} 3158 3159int 3160ttyread(struct cdev *dev, struct uio *uio, int flag) 3161{ 3162 struct tty *tp; 3163 3164 tp = tty_gettp(dev); 3165 3166 if (tp->t_state & TS_GONE) 3167 return (ENODEV); 3168 return (ttyld_read(tp, uio, flag)); 3169} 3170 3171int 3172ttywrite(struct cdev *dev, struct uio *uio, int flag) 3173{ 3174 struct tty *tp; 3175 3176 tp = tty_gettp(dev); 3177 3178 if (tp->t_state & TS_GONE) 3179 return (ENODEV); 3180 return (ttyld_write(tp, uio, flag)); 3181} 3182 3183int 3184ttyioctl(struct cdev *dev, u_long cmd, caddr_t data, int flag, struct thread *td) 3185{ 3186 struct tty *tp; 3187 int error; 3188 3189 tp = dev->si_tty; 3190 3191 if (cmd == TIOCSETA || cmd == TIOCSETAW || cmd == TIOCSETAF) { 3192 int cc; 3193 struct termios *dt = (struct termios *)data; 3194 struct termios *lt = 3195 ISCALLOUT(dev) ? &tp->t_lock_out : &tp->t_lock_in; 3196 3197 dt->c_iflag = (tp->t_iflag & lt->c_iflag) 3198 | (dt->c_iflag & ~lt->c_iflag); 3199 dt->c_oflag = (tp->t_oflag & lt->c_oflag) 3200 | (dt->c_oflag & ~lt->c_oflag); 3201 dt->c_cflag = (tp->t_cflag & lt->c_cflag) 3202 | (dt->c_cflag & ~lt->c_cflag); 3203 dt->c_lflag = (tp->t_lflag & lt->c_lflag) 3204 | (dt->c_lflag & ~lt->c_lflag); 3205 for (cc = 0; cc < NCCS; ++cc) 3206 if (lt->c_cc[cc] != 0) 3207 dt->c_cc[cc] = tp->t_cc[cc]; 3208 if (lt->c_ispeed != 0) 3209 dt->c_ispeed = tp->t_ispeed; 3210 if (lt->c_ospeed != 0) 3211 dt->c_ospeed = tp->t_ospeed; 3212 } 3213 3214 error = ttyld_ioctl(tp, cmd, data, flag, td); 3215 if (error == ENOIOCTL) 3216 error = ttioctl(tp, cmd, data, flag); 3217 ttyldoptim(tp); 3218 if (error != ENOIOCTL) 3219 return (error); 3220 return (ENOTTY); 3221} 3222 3223void 3224ttyldoptim(struct tty *tp) 3225{ 3226 struct termios *t; 3227 3228 t = &tp->t_termios; 3229 if (!(t->c_iflag & (ICRNL | IGNCR | IMAXBEL | INLCR | ISTRIP | IXON)) 3230 && (!(t->c_iflag & BRKINT) || (t->c_iflag & IGNBRK)) 3231 && (!(t->c_iflag & PARMRK) 3232 || (t->c_iflag & (IGNPAR | IGNBRK)) == (IGNPAR | IGNBRK)) 3233 && !(t->c_lflag & (ECHO | ICANON | IEXTEN | ISIG | PENDIN)) 3234 && linesw[tp->t_line]->l_rint == ttyinput) 3235 tp->t_state |= TS_CAN_BYPASS_L_RINT; 3236 else 3237 tp->t_state &= ~TS_CAN_BYPASS_L_RINT; 3238} 3239 3240static void 3241ttydtrwaitwakeup(void *arg) 3242{ 3243 struct tty *tp; 3244 3245 tp = arg; 3246 tp->t_state &= ~TS_DTR_WAIT; 3247 wakeup(&tp->t_dtr_wait); 3248} 3249 3250 3251void 3252ttydtrwaitstart(struct tty *tp) 3253{ 3254 3255 if (tp->t_dtr_wait == 0) 3256 return; 3257 if (tp->t_state & TS_DTR_WAIT) 3258 return; 3259 timeout(ttydtrwaitwakeup, tp, tp->t_dtr_wait); 3260 tp->t_state |= TS_DTR_WAIT; 3261} 3262 3263int 3264ttydtrwaitsleep(struct tty *tp) 3265{ 3266 int error; 3267 3268 error = 0; 3269 while (error == 0) { 3270 if (tp->t_state & TS_GONE) 3271 error = ENXIO; 3272 else if (!(tp->t_state & TS_DTR_WAIT)) 3273 break; 3274 else 3275 error = tsleep(&tp->t_dtr_wait, TTIPRI | PCATCH, 3276 "dtrwait", 0); 3277 } 3278 return (error); 3279} 3280 3281static int 3282ttysopen(struct cdev *dev, int flag, int mode, struct thread *td) 3283{ 3284 struct tty *tp; 3285 3286 tp = dev->si_tty; 3287 KASSERT(tp != NULL, 3288 ("ttysopen(): no tty pointer on device (%s)", devtoname(dev))); 3289 if (tp->t_state & TS_GONE) 3290 return (ENODEV); 3291 return (0); 3292} 3293 3294static int 3295ttysclose(struct cdev *dev, int flag, int mode, struct thread *td) 3296{ 3297 3298 return (0); 3299} 3300 3301static int 3302ttysrdwr(struct cdev *dev, struct uio *uio, int flag) 3303{ 3304 3305 return (ENODEV); 3306} 3307 3308static int 3309ttysioctl(struct cdev *dev, u_long cmd, caddr_t data, int flag, struct thread *td) 3310{ 3311 struct tty *tp; 3312 int error; 3313 struct termios *ct; 3314 3315 tp = dev->si_tty; 3316 KASSERT(tp != NULL, 3317 ("ttysopen(): no tty pointer on device (%s)", devtoname(dev))); 3318 if (tp->t_state & TS_GONE) 3319 return (ENODEV); 3320 ct = dev->si_drv2; 3321 switch (cmd) { 3322 case TIOCSETA: 3323 error = suser(td); 3324 if (error != 0) 3325 return (error); 3326 *ct = *(struct termios *)data; 3327 return (0); 3328 case TIOCGETA: 3329 *(struct termios *)data = *ct; 3330 return (0); 3331 case TIOCGETD: 3332 *(int *)data = TTYDISC; 3333 return (0); 3334 case TIOCGWINSZ: 3335 bzero(data, sizeof(struct winsize)); 3336 return (0); 3337 default: 3338 if (tp->t_cioctl != NULL) 3339 return(tp->t_cioctl(dev, cmd, data, flag, td)); 3340 return (ENOTTY); 3341 } 3342} 3343 3344/* 3345 * Initialize a tty to sane modes. 3346 */ 3347void 3348ttyinitmode(struct tty *tp, int echo, int speed) 3349{ 3350 3351 if (speed == 0) 3352 speed = TTYDEF_SPEED; 3353 tp->t_init_in.c_iflag = TTYDEF_IFLAG; 3354 tp->t_init_in.c_oflag = TTYDEF_OFLAG; 3355 tp->t_init_in.c_cflag = TTYDEF_CFLAG; 3356 if (echo) 3357 tp->t_init_in.c_lflag = TTYDEF_LFLAG_ECHO; 3358 else 3359 tp->t_init_in.c_lflag = TTYDEF_LFLAG_NOECHO; 3360 3361 tp->t_init_in.c_ispeed = tp->t_init_in.c_ospeed = speed; 3362 termioschars(&tp->t_init_in); 3363 tp->t_init_out = tp->t_init_in; 3364 tp->t_termios = tp->t_init_in; 3365} 3366 3367/* 3368 * Use more "normal" termios paramters for consoles. 3369 */ 3370void 3371ttyconsolemode(struct tty *tp, int speed) 3372{ 3373 3374 if (speed == 0) 3375 speed = TTYDEF_SPEED; 3376 ttyinitmode(tp, 1, speed); 3377 tp->t_init_in.c_cflag |= CLOCAL; 3378 tp->t_lock_out.c_cflag = tp->t_lock_in.c_cflag = CLOCAL; 3379 tp->t_lock_out.c_ispeed = tp->t_lock_out.c_ospeed = 3380 tp->t_lock_in.c_ispeed = tp->t_lock_in.c_ospeed = speed; 3381 tp->t_init_out = tp->t_init_in; 3382 tp->t_termios = tp->t_init_in; 3383 ttsetwater(tp); 3384} 3385 3386/* 3387 * Record the relationship between the serial ports notion of modem control 3388 * signals and the one used in certain ioctls in a way the compiler can enforce 3389 * XXX: We should define TIOCM_* in terms of SER_ if we can limit the 3390 * XXX: consequences of the #include work that would take. 3391 */ 3392CTASSERT(SER_DTR == TIOCM_DTR / 2); 3393CTASSERT(SER_RTS == TIOCM_RTS / 2); 3394CTASSERT(SER_STX == TIOCM_ST / 2); 3395CTASSERT(SER_SRX == TIOCM_SR / 2); 3396CTASSERT(SER_CTS == TIOCM_CTS / 2); 3397CTASSERT(SER_DCD == TIOCM_DCD / 2); 3398CTASSERT(SER_RI == TIOCM_RI / 2); 3399CTASSERT(SER_DSR == TIOCM_DSR / 2); 3400 3401