tty.c revision 164033
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 164033 2006-11-06 13:42:10Z rwatson $"); 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/priv.h> 90#include <sys/proc.h> 91#define TTYDEFCHARS 92#include <sys/tty.h> 93#undef TTYDEFCHARS 94#include <sys/fcntl.h> 95#include <sys/conf.h> 96#include <sys/poll.h> 97#include <sys/kernel.h> 98#include <sys/vnode.h> 99#include <sys/serial.h> 100#include <sys/signalvar.h> 101#include <sys/resourcevar.h> 102#include <sys/malloc.h> 103#include <sys/filedesc.h> 104#include <sys/sched.h> 105#include <sys/sysctl.h> 106#include <sys/timepps.h> 107 108#include <machine/stdarg.h> 109 110#include <vm/vm.h> 111#include <vm/pmap.h> 112#include <vm/vm_map.h> 113 114MALLOC_DEFINE(M_TTYS, "ttys", "tty data structures"); 115 116long tk_cancc; 117long tk_nin; 118long tk_nout; 119long tk_rawcc; 120 121static d_open_t ttysopen; 122static d_close_t ttysclose; 123static d_read_t ttysrdwr; 124static d_ioctl_t ttysioctl; 125static d_purge_t ttypurge; 126 127/* Default cdevsw for common tty devices */ 128static struct cdevsw tty_cdevsw = { 129 .d_version = D_VERSION, 130 .d_open = ttyopen, 131 .d_close = ttyclose, 132 .d_ioctl = ttyioctl, 133 .d_purge = ttypurge, 134 .d_name = "ttydrv", 135 .d_flags = D_TTY | D_NEEDGIANT, 136}; 137 138/* Cdevsw for slave tty devices */ 139static struct cdevsw ttys_cdevsw = { 140 .d_version = D_VERSION, 141 .d_open = ttysopen, 142 .d_close = ttysclose, 143 .d_read = ttysrdwr, 144 .d_write = ttysrdwr, 145 .d_ioctl = ttysioctl, 146 .d_name = "TTYS", 147 .d_flags = D_TTY | D_NEEDGIANT, 148}; 149 150static int proc_compare(struct proc *p1, struct proc *p2); 151static int ttnread(struct tty *tp); 152static void ttyecho(int c, struct tty *tp); 153static int ttyoutput(int c, struct tty *tp); 154static void ttypend(struct tty *tp); 155static void ttyretype(struct tty *tp); 156static void ttyrub(int c, struct tty *tp); 157static void ttyrubo(struct tty *tp, int cnt); 158static void ttyunblock(struct tty *tp); 159static int ttywflush(struct tty *tp); 160static int filt_ttyread(struct knote *kn, long hint); 161static void filt_ttyrdetach(struct knote *kn); 162static int filt_ttywrite(struct knote *kn, long hint); 163static void filt_ttywdetach(struct knote *kn); 164 165/* 166 * Table with character classes and parity. The 8th bit indicates parity, 167 * the 7th bit indicates the character is an alphameric or underscore (for 168 * ALTWERASE), and the low 6 bits indicate delay type. If the low 6 bits 169 * are 0 then the character needs no special processing on output; classes 170 * other than 0 might be translated or (not currently) require delays. 171 */ 172#define E 0x00 /* Even parity. */ 173#define O 0x80 /* Odd parity. */ 174#define PARITY(c) (char_type[c] & O) 175 176#define ALPHA 0x40 /* Alpha or underscore. */ 177#define ISALPHA(c) (char_type[(c) & TTY_CHARMASK] & ALPHA) 178 179#define CCLASSMASK 0x3f 180#define CCLASS(c) (char_type[c] & CCLASSMASK) 181 182#define BS BACKSPACE 183#define CC CONTROL 184#define CR RETURN 185#define NA ORDINARY | ALPHA 186#define NL NEWLINE 187#define NO ORDINARY 188#define TB TAB 189#define VT VTAB 190 191static u_char const char_type[] = { 192 E|CC, O|CC, O|CC, E|CC, O|CC, E|CC, E|CC, O|CC, /* nul - bel */ 193 O|BS, E|TB, E|NL, O|CC, E|VT, O|CR, O|CC, E|CC, /* bs - si */ 194 O|CC, E|CC, E|CC, O|CC, E|CC, O|CC, O|CC, E|CC, /* dle - etb */ 195 E|CC, O|CC, O|CC, E|CC, O|CC, E|CC, E|CC, O|CC, /* can - us */ 196 O|NO, E|NO, E|NO, O|NO, E|NO, O|NO, O|NO, E|NO, /* sp - ' */ 197 E|NO, O|NO, O|NO, E|NO, O|NO, E|NO, E|NO, O|NO, /* ( - / */ 198 E|NA, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* 0 - 7 */ 199 O|NA, E|NA, E|NO, O|NO, E|NO, O|NO, O|NO, E|NO, /* 8 - ? */ 200 O|NO, E|NA, E|NA, O|NA, E|NA, O|NA, O|NA, E|NA, /* @ - G */ 201 E|NA, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* H - O */ 202 E|NA, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* P - W */ 203 O|NA, E|NA, E|NA, O|NO, E|NO, O|NO, O|NO, O|NA, /* X - _ */ 204 E|NO, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* ` - g */ 205 O|NA, E|NA, E|NA, O|NA, E|NA, O|NA, O|NA, E|NA, /* h - o */ 206 O|NA, E|NA, E|NA, O|NA, E|NA, O|NA, O|NA, E|NA, /* p - w */ 207 E|NA, O|NA, O|NA, E|NO, O|NO, E|NO, E|NO, O|CC, /* x - del */ 208 /* 209 * Meta chars; should be settable per character set; 210 * for now, treat them all as normal characters. 211 */ 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 NA, NA, NA, NA, NA, NA, NA, NA, 228}; 229#undef BS 230#undef CC 231#undef CR 232#undef NA 233#undef NL 234#undef NO 235#undef TB 236#undef VT 237 238/* Macros to clear/set/test flags. */ 239#define SET(t, f) (t) |= (f) 240#define CLR(t, f) (t) &= ~(f) 241#define ISSET(t, f) ((t) & (f)) 242 243#undef MAX_INPUT /* XXX wrong in <sys/syslimits.h> */ 244#define MAX_INPUT TTYHOG /* XXX limit is usually larger for !ICANON */ 245 246/* 247 * list of struct tty where pstat(8) can pick it up with sysctl 248 * 249 * The lock order is to grab the list mutex before the tty mutex. 250 * Together with additions going on the tail of the list, this allows 251 * the sysctl to avoid doing retries. 252 */ 253static TAILQ_HEAD(, tty) tty_list = TAILQ_HEAD_INITIALIZER(tty_list); 254static struct mtx tty_list_mutex; 255MTX_SYSINIT(tty_list, &tty_list_mutex, "ttylist", MTX_DEF); 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 /* 338 * Any close with tp->t_refcnt == 1 is wrong and is 339 * an indication of a locking bug somewhere and that 340 * our open call has not been finished properly. 341 * Instead of putting an assert here we skip decrementing 342 * the refcount to work around any problems. 343 */ 344 if (tp->t_refcnt > 1) 345 ttyrel(tp); 346 splx(s); 347 return (0); 348} 349 350#define FLUSHQ(q) { \ 351 if ((q)->c_cc) \ 352 ndflush(q, (q)->c_cc); \ 353} 354 355/* Is 'c' a line delimiter ("break" character)? */ 356#define TTBREAKC(c, lflag) \ 357 ((c) == '\n' || (((c) == cc[VEOF] || \ 358 (c) == cc[VEOL] || ((c) == cc[VEOL2] && lflag & IEXTEN)) && \ 359 (c) != _POSIX_VDISABLE)) 360 361/* 362 * Process input of a single character received on a tty. 363 */ 364int 365ttyinput(int c, struct tty *tp) 366{ 367 tcflag_t iflag, lflag; 368 cc_t *cc; 369 int i, err; 370 371 /* 372 * If input is pending take it first. 373 */ 374 lflag = tp->t_lflag; 375 if (ISSET(lflag, PENDIN)) 376 ttypend(tp); 377 /* 378 * Gather stats. 379 */ 380 if (ISSET(lflag, ICANON)) { 381 ++tk_cancc; 382 ++tp->t_cancc; 383 } else { 384 ++tk_rawcc; 385 ++tp->t_rawcc; 386 } 387 ++tk_nin; 388 389 /* 390 * Block further input iff: 391 * current input > threshold AND input is available to user program 392 * AND input flow control is enabled and not yet invoked. 393 * The 3 is slop for PARMRK. 394 */ 395 iflag = tp->t_iflag; 396 if (tp->t_rawq.c_cc + tp->t_canq.c_cc > tp->t_ihiwat - 3 && 397 (!ISSET(lflag, ICANON) || tp->t_canq.c_cc != 0) && 398 (ISSET(tp->t_cflag, CRTS_IFLOW) || ISSET(iflag, IXOFF)) && 399 !ISSET(tp->t_state, TS_TBLOCK)) 400 ttyblock(tp); 401 402 /* Handle exceptional conditions (break, parity, framing). */ 403 cc = tp->t_cc; 404 err = (ISSET(c, TTY_ERRORMASK)); 405 if (err) { 406 CLR(c, TTY_ERRORMASK); 407 if (ISSET(err, TTY_BI)) { 408 if (ISSET(iflag, IGNBRK)) 409 return (0); 410 if (ISSET(iflag, BRKINT)) { 411 ttyflush(tp, FREAD | FWRITE); 412 if (tp->t_pgrp != NULL) { 413 PGRP_LOCK(tp->t_pgrp); 414 pgsignal(tp->t_pgrp, SIGINT, 1); 415 PGRP_UNLOCK(tp->t_pgrp); 416 } 417 goto endcase; 418 } 419 if (ISSET(iflag, PARMRK)) 420 goto parmrk; 421 } else if ((ISSET(err, TTY_PE) && ISSET(iflag, INPCK)) 422 || ISSET(err, TTY_FE)) { 423 if (ISSET(iflag, IGNPAR)) 424 return (0); 425 else if (ISSET(iflag, PARMRK)) { 426parmrk: 427 if (tp->t_rawq.c_cc + tp->t_canq.c_cc > 428 MAX_INPUT - 3) 429 goto input_overflow; 430 (void)putc(0377 | TTY_QUOTE, &tp->t_rawq); 431 (void)putc(0 | TTY_QUOTE, &tp->t_rawq); 432 (void)putc(c | TTY_QUOTE, &tp->t_rawq); 433 goto endcase; 434 } else 435 c = 0; 436 } 437 } 438 439 if (!ISSET(tp->t_state, TS_TYPEN) && ISSET(iflag, ISTRIP)) 440 CLR(c, 0x80); 441 if (!ISSET(lflag, EXTPROC)) { 442 /* 443 * Check for literal nexting very first 444 */ 445 if (ISSET(tp->t_state, TS_LNCH)) { 446 SET(c, TTY_QUOTE); 447 CLR(tp->t_state, TS_LNCH); 448 } 449 /* 450 * Scan for special characters. This code 451 * is really just a big case statement with 452 * non-constant cases. The bottom of the 453 * case statement is labeled ``endcase'', so goto 454 * it after a case match, or similar. 455 */ 456 457 /* 458 * Control chars which aren't controlled 459 * by ICANON, ISIG, or IXON. 460 */ 461 if (ISSET(lflag, IEXTEN)) { 462 if (CCEQ(cc[VLNEXT], c)) { 463 if (ISSET(lflag, ECHO)) { 464 if (ISSET(lflag, ECHOE)) { 465 (void)ttyoutput('^', tp); 466 (void)ttyoutput('\b', tp); 467 } else 468 ttyecho(c, tp); 469 } 470 SET(tp->t_state, TS_LNCH); 471 goto endcase; 472 } 473 if (CCEQ(cc[VDISCARD], c)) { 474 if (ISSET(lflag, FLUSHO)) 475 CLR(tp->t_lflag, FLUSHO); 476 else { 477 ttyflush(tp, FWRITE); 478 ttyecho(c, tp); 479 if (tp->t_rawq.c_cc + tp->t_canq.c_cc) 480 ttyretype(tp); 481 SET(tp->t_lflag, FLUSHO); 482 } 483 goto startoutput; 484 } 485 } 486 /* 487 * Signals. 488 */ 489 if (ISSET(lflag, ISIG)) { 490 if (CCEQ(cc[VINTR], c) || CCEQ(cc[VQUIT], c)) { 491 if (!ISSET(lflag, NOFLSH)) 492 ttyflush(tp, FREAD | FWRITE); 493 ttyecho(c, tp); 494 if (tp->t_pgrp != NULL) { 495 PGRP_LOCK(tp->t_pgrp); 496 pgsignal(tp->t_pgrp, 497 CCEQ(cc[VINTR], c) ? SIGINT : SIGQUIT, 1); 498 PGRP_UNLOCK(tp->t_pgrp); 499 } 500 goto endcase; 501 } 502 if (CCEQ(cc[VSUSP], c)) { 503 if (!ISSET(lflag, NOFLSH)) 504 ttyflush(tp, FREAD); 505 ttyecho(c, tp); 506 if (tp->t_pgrp != NULL) { 507 PGRP_LOCK(tp->t_pgrp); 508 pgsignal(tp->t_pgrp, SIGTSTP, 1); 509 PGRP_UNLOCK(tp->t_pgrp); 510 } 511 goto endcase; 512 } 513 } 514 /* 515 * Handle start/stop characters. 516 */ 517 if (ISSET(iflag, IXON)) { 518 if (CCEQ(cc[VSTOP], c)) { 519 if (!ISSET(tp->t_state, TS_TTSTOP)) { 520 SET(tp->t_state, TS_TTSTOP); 521 tt_stop(tp, 0); 522 return (0); 523 } 524 if (!CCEQ(cc[VSTART], c)) 525 return (0); 526 /* 527 * if VSTART == VSTOP then toggle 528 */ 529 goto endcase; 530 } 531 if (CCEQ(cc[VSTART], c)) 532 goto restartoutput; 533 } 534 /* 535 * IGNCR, ICRNL, & INLCR 536 */ 537 if (c == '\r') { 538 if (ISSET(iflag, IGNCR)) 539 return (0); 540 else if (ISSET(iflag, ICRNL)) 541 c = '\n'; 542 } else if (c == '\n' && ISSET(iflag, INLCR)) 543 c = '\r'; 544 } 545 if (!ISSET(tp->t_lflag, EXTPROC) && ISSET(lflag, ICANON)) { 546 /* 547 * From here on down canonical mode character 548 * processing takes place. 549 */ 550 /* 551 * erase or erase2 (^H / ^?) 552 */ 553 if (CCEQ(cc[VERASE], c) || CCEQ(cc[VERASE2], c) ) { 554 if (tp->t_rawq.c_cc) 555 ttyrub(unputc(&tp->t_rawq), tp); 556 goto endcase; 557 } 558 /* 559 * kill (^U) 560 */ 561 if (CCEQ(cc[VKILL], c)) { 562 if (ISSET(lflag, ECHOKE) && 563 tp->t_rawq.c_cc == tp->t_rocount && 564 !ISSET(lflag, ECHOPRT)) 565 while (tp->t_rawq.c_cc) 566 ttyrub(unputc(&tp->t_rawq), tp); 567 else { 568 ttyecho(c, tp); 569 if (ISSET(lflag, ECHOK) || 570 ISSET(lflag, ECHOKE)) 571 ttyecho('\n', tp); 572 FLUSHQ(&tp->t_rawq); 573 tp->t_rocount = 0; 574 } 575 CLR(tp->t_state, TS_LOCAL); 576 goto endcase; 577 } 578 /* 579 * word erase (^W) 580 */ 581 if (CCEQ(cc[VWERASE], c) && ISSET(lflag, IEXTEN)) { 582 int ctype; 583 584 /* 585 * erase whitespace 586 */ 587 while ((c = unputc(&tp->t_rawq)) == ' ' || c == '\t') 588 ttyrub(c, tp); 589 if (c == -1) 590 goto endcase; 591 /* 592 * erase last char of word and remember the 593 * next chars type (for ALTWERASE) 594 */ 595 ttyrub(c, tp); 596 c = unputc(&tp->t_rawq); 597 if (c == -1) 598 goto endcase; 599 if (c == ' ' || c == '\t') { 600 (void)putc(c, &tp->t_rawq); 601 goto endcase; 602 } 603 ctype = ISALPHA(c); 604 /* 605 * erase rest of word 606 */ 607 do { 608 ttyrub(c, tp); 609 c = unputc(&tp->t_rawq); 610 if (c == -1) 611 goto endcase; 612 } while (c != ' ' && c != '\t' && 613 (!ISSET(lflag, ALTWERASE) || ISALPHA(c) == ctype)); 614 (void)putc(c, &tp->t_rawq); 615 goto endcase; 616 } 617 /* 618 * reprint line (^R) 619 */ 620 if (CCEQ(cc[VREPRINT], c) && ISSET(lflag, IEXTEN)) { 621 ttyretype(tp); 622 goto endcase; 623 } 624 /* 625 * ^T - kernel info and generate SIGINFO 626 */ 627 if (CCEQ(cc[VSTATUS], c) && ISSET(lflag, IEXTEN)) { 628 if (ISSET(lflag, ISIG) && tp->t_pgrp != NULL) { 629 PGRP_LOCK(tp->t_pgrp); 630 pgsignal(tp->t_pgrp, SIGINFO, 1); 631 PGRP_UNLOCK(tp->t_pgrp); 632 } 633 if (!ISSET(lflag, NOKERNINFO)) 634 ttyinfo(tp); 635 goto endcase; 636 } 637 } 638 /* 639 * Check for input buffer overflow 640 */ 641 if (tp->t_rawq.c_cc + tp->t_canq.c_cc >= MAX_INPUT) { 642input_overflow: 643 if (ISSET(iflag, IMAXBEL)) { 644 if (tp->t_outq.c_cc < tp->t_ohiwat) 645 (void)ttyoutput(CTRL('g'), tp); 646 } 647 goto endcase; 648 } 649 650 if ( c == 0377 && ISSET(iflag, PARMRK) && !ISSET(iflag, ISTRIP) 651 && ISSET(iflag, IGNBRK|IGNPAR) != (IGNBRK|IGNPAR)) 652 (void)putc(0377 | TTY_QUOTE, &tp->t_rawq); 653 654 /* 655 * Put data char in q for user and 656 * wakeup on seeing a line delimiter. 657 */ 658 if (putc(c, &tp->t_rawq) >= 0) { 659 if (!ISSET(lflag, ICANON)) { 660 ttwakeup(tp); 661 ttyecho(c, tp); 662 goto endcase; 663 } 664 if (TTBREAKC(c, lflag)) { 665 tp->t_rocount = 0; 666 catq(&tp->t_rawq, &tp->t_canq); 667 ttwakeup(tp); 668 } else if (tp->t_rocount++ == 0) 669 tp->t_rocol = tp->t_column; 670 if (ISSET(tp->t_state, TS_ERASE)) { 671 /* 672 * end of prterase \.../ 673 */ 674 CLR(tp->t_state, TS_ERASE); 675 (void)ttyoutput('/', tp); 676 } 677 i = tp->t_column; 678 ttyecho(c, tp); 679 if (CCEQ(cc[VEOF], c) && ISSET(lflag, ECHO)) { 680 /* 681 * Place the cursor over the '^' of the ^D. 682 */ 683 i = imin(2, tp->t_column - i); 684 while (i > 0) { 685 (void)ttyoutput('\b', tp); 686 i--; 687 } 688 } 689 } 690endcase: 691 /* 692 * IXANY means allow any character to restart output. 693 */ 694 if (ISSET(tp->t_state, TS_TTSTOP) && 695 !ISSET(iflag, IXANY) && cc[VSTART] != cc[VSTOP]) 696 return (0); 697restartoutput: 698 CLR(tp->t_lflag, FLUSHO); 699 CLR(tp->t_state, TS_TTSTOP); 700startoutput: 701 return (ttstart(tp)); 702} 703 704/* 705 * Output a single character on a tty, doing output processing 706 * as needed (expanding tabs, newline processing, etc.). 707 * Returns < 0 if succeeds, otherwise returns char to resend. 708 * Must be recursive. 709 */ 710static int 711ttyoutput(int c, struct tty *tp) 712{ 713 tcflag_t oflag; 714 int col, s; 715 716 oflag = tp->t_oflag; 717 if (!ISSET(oflag, OPOST)) { 718 if (ISSET(tp->t_lflag, FLUSHO)) 719 return (-1); 720 if (putc(c, &tp->t_outq)) 721 return (c); 722 tk_nout++; 723 tp->t_outcc++; 724 return (-1); 725 } 726 /* 727 * Do tab expansion if OXTABS is set. Special case if we external 728 * processing, we don't do the tab expansion because we'll probably 729 * get it wrong. If tab expansion needs to be done, let it happen 730 * externally. 731 */ 732 CLR(c, ~TTY_CHARMASK); 733 if (c == '\t' && 734 ISSET(oflag, OXTABS) && !ISSET(tp->t_lflag, EXTPROC)) { 735 c = 8 - (tp->t_column & 7); 736 if (!ISSET(tp->t_lflag, FLUSHO)) { 737 s = spltty(); /* Don't interrupt tabs. */ 738 c -= b_to_q(" ", c, &tp->t_outq); 739 tk_nout += c; 740 tp->t_outcc += c; 741 splx(s); 742 } 743 tp->t_column += c; 744 return (c ? -1 : '\t'); 745 } 746 if (c == CEOT && ISSET(oflag, ONOEOT)) 747 return (-1); 748 749 /* 750 * Newline translation: if ONLCR is set, 751 * translate newline into "\r\n". 752 */ 753 if (c == '\n' && ISSET(tp->t_oflag, ONLCR)) { 754 tk_nout++; 755 tp->t_outcc++; 756 if (!ISSET(tp->t_lflag, FLUSHO) && putc('\r', &tp->t_outq)) 757 return (c); 758 } 759 /* If OCRNL is set, translate "\r" into "\n". */ 760 else if (c == '\r' && ISSET(tp->t_oflag, OCRNL)) 761 c = '\n'; 762 /* If ONOCR is set, don't transmit CRs when on column 0. */ 763 else if (c == '\r' && ISSET(tp->t_oflag, ONOCR) && tp->t_column == 0) 764 return (-1); 765 766 tk_nout++; 767 tp->t_outcc++; 768 if (!ISSET(tp->t_lflag, FLUSHO) && putc(c, &tp->t_outq)) 769 return (c); 770 771 col = tp->t_column; 772 switch (CCLASS(c)) { 773 case BACKSPACE: 774 if (col > 0) 775 --col; 776 break; 777 case CONTROL: 778 break; 779 case NEWLINE: 780 if (ISSET(tp->t_oflag, ONLCR | ONLRET)) 781 col = 0; 782 break; 783 case RETURN: 784 col = 0; 785 break; 786 case ORDINARY: 787 ++col; 788 break; 789 case TAB: 790 col = (col + 8) & ~7; 791 break; 792 } 793 tp->t_column = col; 794 return (-1); 795} 796 797/* 798 * Ioctls for all tty devices. Called after line-discipline specific ioctl 799 * has been called to do discipline-specific functions and/or reject any 800 * of these ioctl commands. 801 */ 802/* ARGSUSED */ 803int 804ttioctl(struct tty *tp, u_long cmd, void *data, int flag) 805{ 806 struct proc *p; 807 struct thread *td; 808 struct pgrp *pgrp; 809 int s, error, bits, sig, sig2; 810 811 td = curthread; /* XXX */ 812 p = td->td_proc; 813 814 /* If the ioctl involves modification, hang if in the background. */ 815 switch (cmd) { 816 case TIOCCBRK: 817 case TIOCCONS: 818 case TIOCDRAIN: 819 case TIOCEXCL: 820 case TIOCFLUSH: 821#ifdef TIOCHPCL 822 case TIOCHPCL: 823#endif 824 case TIOCNXCL: 825 case TIOCSBRK: 826 case TIOCSCTTY: 827 case TIOCSDRAINWAIT: 828 case TIOCSETA: 829 case TIOCSETAF: 830 case TIOCSETAW: 831 case TIOCSETD: 832 case TIOCSPGRP: 833 case TIOCSTART: 834 case TIOCSTAT: 835 case TIOCSTI: 836 case TIOCSTOP: 837 case TIOCSWINSZ: 838#if defined(COMPAT_43TTY) 839 case TIOCLBIC: 840 case TIOCLBIS: 841 case TIOCLSET: 842 case TIOCSETC: 843 case OTIOCSETD: 844 case TIOCSETN: 845 case TIOCSETP: 846 case TIOCSLTC: 847#endif 848 sx_slock(&proctree_lock); 849 PROC_LOCK(p); 850 while (isbackground(p, tp) && !(p->p_flag & P_PPWAIT) && 851 !SIGISMEMBER(p->p_sigacts->ps_sigignore, SIGTTOU) && 852 !SIGISMEMBER(td->td_sigmask, SIGTTOU)) { 853 pgrp = p->p_pgrp; 854 PROC_UNLOCK(p); 855 if (pgrp->pg_jobc == 0) { 856 sx_sunlock(&proctree_lock); 857 return (EIO); 858 } 859 PGRP_LOCK(pgrp); 860 sx_sunlock(&proctree_lock); 861 pgsignal(pgrp, SIGTTOU, 1); 862 PGRP_UNLOCK(pgrp); 863 error = ttysleep(tp, &lbolt, TTOPRI | PCATCH, "ttybg1", 864 0); 865 if (error) 866 return (error); 867 sx_slock(&proctree_lock); 868 PROC_LOCK(p); 869 } 870 PROC_UNLOCK(p); 871 sx_sunlock(&proctree_lock); 872 break; 873 } 874 875 876 if (tp->t_modem != NULL) { 877 switch (cmd) { 878 case TIOCSDTR: 879 tt_modem(tp, SER_DTR, 0); 880 return (0); 881 case TIOCCDTR: 882 tt_modem(tp, 0, SER_DTR); 883 return (0); 884 case TIOCMSET: 885 bits = *(int *)data; 886 sig = (bits & (TIOCM_DTR | TIOCM_RTS)) >> 1; 887 sig2 = ((~bits) & (TIOCM_DTR | TIOCM_RTS)) >> 1; 888 tt_modem(tp, sig, sig2); 889 return (0); 890 case TIOCMBIS: 891 bits = *(int *)data; 892 sig = (bits & (TIOCM_DTR | TIOCM_RTS)) >> 1; 893 tt_modem(tp, sig, 0); 894 return (0); 895 case TIOCMBIC: 896 bits = *(int *)data; 897 sig = (bits & (TIOCM_DTR | TIOCM_RTS)) >> 1; 898 tt_modem(tp, 0, sig); 899 return (0); 900 case TIOCMGET: 901 sig = tt_modem(tp, 0, 0); 902 /* See <sys/serial.h. for the "<< 1" stuff */ 903 bits = TIOCM_LE + (sig << 1); 904 *(int *)data = bits; 905 return (0); 906 default: 907 break; 908 } 909 } 910 911 if (tp->t_pps != NULL) { 912 error = pps_ioctl(cmd, data, tp->t_pps); 913 if (error != ENOIOCTL) 914 return (error); 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 = priv_check(td, PRIV_TTY_DTRWAIT); 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 error = tt_param(tp, t); 1063 if (error) { 1064 splx(s); 1065 return (error); 1066 } 1067 if (ISSET(t->c_cflag, CLOCAL) && 1068 !ISSET(tp->t_cflag, CLOCAL)) { 1069 /* 1070 * XXX disconnections would be too hard to 1071 * get rid of without this kludge. The only 1072 * way to get rid of controlling terminals 1073 * is to exit from the session leader. 1074 */ 1075 CLR(tp->t_state, TS_ZOMBIE); 1076 1077 wakeup(TSA_CARR_ON(tp)); 1078 ttwakeup(tp); 1079 ttwwakeup(tp); 1080 } 1081 if ((ISSET(tp->t_state, TS_CARR_ON) || 1082 ISSET(t->c_cflag, CLOCAL)) && 1083 !ISSET(tp->t_state, TS_ZOMBIE)) 1084 SET(tp->t_state, TS_CONNECTED); 1085 else 1086 CLR(tp->t_state, TS_CONNECTED); 1087 tp->t_cflag = t->c_cflag; 1088 tp->t_ispeed = t->c_ispeed; 1089 if (t->c_ospeed != 0) 1090 tp->t_ospeed = t->c_ospeed; 1091 ttsetwater(tp); 1092 } 1093 if (ISSET(t->c_lflag, ICANON) != ISSET(tp->t_lflag, ICANON) && 1094 cmd != TIOCSETAF) { 1095 if (ISSET(t->c_lflag, ICANON)) 1096 SET(tp->t_lflag, PENDIN); 1097 else { 1098 /* 1099 * XXX we really shouldn't allow toggling 1100 * ICANON while we're in a non-termios line 1101 * discipline. Now we have to worry about 1102 * panicing for a null queue. 1103 */ 1104 if (tp->t_canq.c_cbreserved > 0 && 1105 tp->t_rawq.c_cbreserved > 0) { 1106 catq(&tp->t_rawq, &tp->t_canq); 1107 /* 1108 * XXX the queue limits may be 1109 * different, so the old queue 1110 * swapping method no longer works. 1111 */ 1112 catq(&tp->t_canq, &tp->t_rawq); 1113 } 1114 CLR(tp->t_lflag, PENDIN); 1115 } 1116 ttwakeup(tp); 1117 } 1118 tp->t_iflag = t->c_iflag; 1119 tp->t_oflag = t->c_oflag; 1120 /* 1121 * Make the EXTPROC bit read only. 1122 */ 1123 if (ISSET(tp->t_lflag, EXTPROC)) 1124 SET(t->c_lflag, EXTPROC); 1125 else 1126 CLR(t->c_lflag, EXTPROC); 1127 tp->t_lflag = t->c_lflag | ISSET(tp->t_lflag, PENDIN); 1128 if (t->c_cc[VMIN] != tp->t_cc[VMIN] || 1129 t->c_cc[VTIME] != tp->t_cc[VTIME]) 1130 ttwakeup(tp); 1131 bcopy(t->c_cc, tp->t_cc, sizeof(t->c_cc)); 1132 splx(s); 1133 break; 1134 } 1135 case TIOCSETD: { /* set line discipline */ 1136 int t = *(int *)data; 1137 1138 if ((u_int)t >= nlinesw) 1139 return (ENXIO); 1140 if (t == tp->t_line) 1141 return (0); 1142 s = spltty(); 1143 ttyld_close(tp, flag); 1144 tp->t_line = t; 1145 /* XXX: we should use the correct cdev here */ 1146 error = ttyld_open(tp, tp->t_dev); 1147 if (error) { 1148 /* 1149 * If we fail to switch line discipline we cannot 1150 * fall back to the previous, because we can not 1151 * trust that ldisc to open successfully either. 1152 * Fall back to the default ldisc which we know 1153 * will allways succeed. 1154 */ 1155 tp->t_line = TTYDISC; 1156 (void)ttyld_open(tp, tp->t_dev); 1157 } 1158 splx(s); 1159 return (error); 1160 break; 1161 } 1162 case TIOCSTART: /* start output, like ^Q */ 1163 s = spltty(); 1164 if (ISSET(tp->t_state, TS_TTSTOP) || 1165 ISSET(tp->t_lflag, FLUSHO)) { 1166 CLR(tp->t_lflag, FLUSHO); 1167 CLR(tp->t_state, TS_TTSTOP); 1168 ttstart(tp); 1169 } 1170 splx(s); 1171 break; 1172 case TIOCSTI: /* simulate terminal input */ 1173 if ((flag & FREAD) == 0 && priv_check(td, PRIV_TTY_STI)) 1174 return (EPERM); 1175 if (!isctty(p, tp) && priv_check(td, PRIV_TTY_STI)) 1176 return (EACCES); 1177 s = spltty(); 1178 ttyld_rint(tp, *(u_char *)data); 1179 splx(s); 1180 break; 1181 case TIOCSTOP: /* stop output, like ^S */ 1182 s = spltty(); 1183 if (!ISSET(tp->t_state, TS_TTSTOP)) { 1184 SET(tp->t_state, TS_TTSTOP); 1185 tt_stop(tp, 0); 1186 } 1187 splx(s); 1188 break; 1189 case TIOCSCTTY: /* become controlling tty */ 1190 /* Session ctty vnode pointer set in vnode layer. */ 1191 sx_slock(&proctree_lock); 1192 if (!SESS_LEADER(p) || 1193 ((p->p_session->s_ttyvp || tp->t_session) && 1194 (tp->t_session != p->p_session))) { 1195 sx_sunlock(&proctree_lock); 1196 return (EPERM); 1197 } 1198 tp->t_session = p->p_session; 1199 tp->t_pgrp = p->p_pgrp; 1200 SESS_LOCK(p->p_session); 1201 ttyref(tp); /* ttyrel(): kern_proc.c:pgdelete() */ 1202 p->p_session->s_ttyp = tp; 1203 SESS_UNLOCK(p->p_session); 1204 PROC_LOCK(p); 1205 p->p_flag |= P_CONTROLT; 1206 PROC_UNLOCK(p); 1207 sx_sunlock(&proctree_lock); 1208 break; 1209 case TIOCSPGRP: { /* set pgrp of tty */ 1210 sx_slock(&proctree_lock); 1211 pgrp = pgfind(*(int *)data); 1212 if (!isctty(p, tp)) { 1213 if (pgrp != NULL) 1214 PGRP_UNLOCK(pgrp); 1215 sx_sunlock(&proctree_lock); 1216 return (ENOTTY); 1217 } 1218 if (pgrp == NULL) { 1219 sx_sunlock(&proctree_lock); 1220 return (EPERM); 1221 } 1222 PGRP_UNLOCK(pgrp); 1223 if (pgrp->pg_session != p->p_session) { 1224 sx_sunlock(&proctree_lock); 1225 return (EPERM); 1226 } 1227 sx_sunlock(&proctree_lock); 1228 tp->t_pgrp = pgrp; 1229 break; 1230 } 1231 case TIOCSTAT: /* simulate control-T */ 1232 s = spltty(); 1233 ttyinfo(tp); 1234 splx(s); 1235 break; 1236 case TIOCSWINSZ: /* set window size */ 1237 if (bcmp((caddr_t)&tp->t_winsize, data, 1238 sizeof (struct winsize))) { 1239 tp->t_winsize = *(struct winsize *)data; 1240 if (tp->t_pgrp != NULL) { 1241 PGRP_LOCK(tp->t_pgrp); 1242 pgsignal(tp->t_pgrp, SIGWINCH, 1); 1243 PGRP_UNLOCK(tp->t_pgrp); 1244 } 1245 } 1246 break; 1247 case TIOCSDRAINWAIT: 1248 error = priv_check(td, PRIV_TTY_DRAINWAIT); 1249 if (error) 1250 return (error); 1251 tp->t_timeout = *(int *)data * hz; 1252 wakeup(TSA_OCOMPLETE(tp)); 1253 wakeup(TSA_OLOWAT(tp)); 1254 break; 1255 case TIOCGDRAINWAIT: 1256 *(int *)data = tp->t_timeout / hz; 1257 break; 1258 case TIOCSBRK: 1259 return (tt_break(tp, 1)); 1260 case TIOCCBRK: 1261 return (tt_break(tp, 0)); 1262 default: 1263#if defined(COMPAT_43TTY) 1264 return (ttcompat(tp, cmd, data, flag)); 1265#else 1266 return (ENOIOCTL); 1267#endif 1268 } 1269 return (0); 1270} 1271 1272int 1273ttypoll(struct cdev *dev, int events, struct thread *td) 1274{ 1275 int s; 1276 int revents = 0; 1277 struct tty *tp; 1278 1279 tp = tty_gettp(dev); 1280 1281 if (tp == NULL) /* XXX used to return ENXIO, but that means true! */ 1282 return ((events & (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM)) 1283 | POLLHUP); 1284 1285 s = spltty(); 1286 if (events & (POLLIN | POLLRDNORM)) { 1287 if (ISSET(tp->t_state, TS_ZOMBIE)) 1288 revents |= (events & (POLLIN | POLLRDNORM)) | 1289 POLLHUP; 1290 else if (ttnread(tp) > 0) 1291 revents |= events & (POLLIN | POLLRDNORM); 1292 else 1293 selrecord(td, &tp->t_rsel); 1294 } 1295 if (events & POLLOUT) { 1296 if (ISSET(tp->t_state, TS_ZOMBIE)) 1297 revents |= POLLHUP; 1298 else if (tp->t_outq.c_cc <= tp->t_olowat && 1299 ISSET(tp->t_state, TS_CONNECTED)) 1300 revents |= events & POLLOUT; 1301 else 1302 selrecord(td, &tp->t_wsel); 1303 } 1304 splx(s); 1305 return (revents); 1306} 1307 1308static struct filterops ttyread_filtops = 1309 { 1, NULL, filt_ttyrdetach, filt_ttyread }; 1310static struct filterops ttywrite_filtops = 1311 { 1, NULL, filt_ttywdetach, filt_ttywrite }; 1312 1313int 1314ttykqfilter(struct cdev *dev, struct knote *kn) 1315{ 1316 struct tty *tp; 1317 struct knlist *klist; 1318 int s; 1319 1320 tp = tty_gettp(dev); 1321 1322 switch (kn->kn_filter) { 1323 case EVFILT_READ: 1324 klist = &tp->t_rsel.si_note; 1325 kn->kn_fop = &ttyread_filtops; 1326 break; 1327 case EVFILT_WRITE: 1328 klist = &tp->t_wsel.si_note; 1329 kn->kn_fop = &ttywrite_filtops; 1330 break; 1331 default: 1332 return (EINVAL); 1333 } 1334 1335 kn->kn_hook = (caddr_t)dev; 1336 1337 s = spltty(); 1338 knlist_add(klist, kn, 0); 1339 splx(s); 1340 1341 return (0); 1342} 1343 1344static void 1345filt_ttyrdetach(struct knote *kn) 1346{ 1347 struct tty *tp = ((struct cdev *)kn->kn_hook)->si_tty; 1348 int s = spltty(); 1349 1350 knlist_remove(&tp->t_rsel.si_note, kn, 0); 1351 splx(s); 1352} 1353 1354static int 1355filt_ttyread(struct knote *kn, long hint) 1356{ 1357 struct tty *tp = ((struct cdev *)kn->kn_hook)->si_tty; 1358 1359 kn->kn_data = ttnread(tp); 1360 if (ISSET(tp->t_state, TS_ZOMBIE)) { 1361 kn->kn_flags |= EV_EOF; 1362 return (1); 1363 } 1364 return (kn->kn_data > 0); 1365} 1366 1367static void 1368filt_ttywdetach(struct knote *kn) 1369{ 1370 struct tty *tp = ((struct cdev *)kn->kn_hook)->si_tty; 1371 int s = spltty(); 1372 1373 knlist_remove(&tp->t_wsel.si_note, kn, 0); 1374 splx(s); 1375} 1376 1377static int 1378filt_ttywrite(struct knote *kn, long hint) 1379{ 1380 struct tty *tp = ((struct cdev *)kn->kn_hook)->si_tty; 1381 1382 kn->kn_data = tp->t_outq.c_cc; 1383 if (ISSET(tp->t_state, TS_ZOMBIE)) 1384 return (1); 1385 return (kn->kn_data <= tp->t_olowat && 1386 ISSET(tp->t_state, TS_CONNECTED)); 1387} 1388 1389/* 1390 * Must be called at spltty(). 1391 */ 1392static int 1393ttnread(struct tty *tp) 1394{ 1395 int nread; 1396 1397 if (ISSET(tp->t_lflag, PENDIN)) 1398 ttypend(tp); 1399 nread = tp->t_canq.c_cc; 1400 if (!ISSET(tp->t_lflag, ICANON)) { 1401 nread += tp->t_rawq.c_cc; 1402 if (nread < tp->t_cc[VMIN] && tp->t_cc[VTIME] == 0) 1403 nread = 0; 1404 } 1405 return (nread); 1406} 1407 1408/* 1409 * Wait for output to drain. 1410 */ 1411int 1412ttywait(struct tty *tp) 1413{ 1414 int error, s; 1415 1416 error = 0; 1417 s = spltty(); 1418 while ((tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY)) && 1419 ISSET(tp->t_state, TS_CONNECTED) && tp->t_oproc) { 1420 tt_oproc(tp); 1421 if ((tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY)) && 1422 ISSET(tp->t_state, TS_CONNECTED)) { 1423 SET(tp->t_state, TS_SO_OCOMPLETE); 1424 error = ttysleep(tp, TSA_OCOMPLETE(tp), 1425 TTOPRI | PCATCH, "ttywai", 1426 tp->t_timeout); 1427 if (error) { 1428 if (error == EWOULDBLOCK) 1429 error = EIO; 1430 break; 1431 } 1432 } else 1433 break; 1434 } 1435 if (!error && (tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY))) 1436 error = EIO; 1437 splx(s); 1438 return (error); 1439} 1440 1441/* 1442 * Flush if successfully wait. 1443 */ 1444static int 1445ttywflush(struct tty *tp) 1446{ 1447 int error; 1448 1449 if ((error = ttywait(tp)) == 0) 1450 ttyflush(tp, FREAD); 1451 return (error); 1452} 1453 1454/* 1455 * Flush tty read and/or write queues, notifying anyone waiting. 1456 */ 1457void 1458ttyflush(struct tty *tp, int rw) 1459{ 1460 int s; 1461 1462 s = spltty(); 1463#if 0 1464again: 1465#endif 1466 if (rw & FWRITE) { 1467 FLUSHQ(&tp->t_outq); 1468 CLR(tp->t_state, TS_TTSTOP); 1469 } 1470 tt_stop(tp, rw); 1471 if (rw & FREAD) { 1472 FLUSHQ(&tp->t_canq); 1473 FLUSHQ(&tp->t_rawq); 1474 CLR(tp->t_lflag, PENDIN); 1475 tp->t_rocount = 0; 1476 tp->t_rocol = 0; 1477 CLR(tp->t_state, TS_LOCAL); 1478 ttwakeup(tp); 1479 if (ISSET(tp->t_state, TS_TBLOCK)) { 1480 if (rw & FWRITE) 1481 FLUSHQ(&tp->t_outq); 1482 ttyunblock(tp); 1483 1484 /* 1485 * Don't let leave any state that might clobber the 1486 * next line discipline (although we should do more 1487 * to send the START char). Not clearing the state 1488 * may have caused the "putc to a clist with no 1489 * reserved cblocks" panic/printf. 1490 */ 1491 CLR(tp->t_state, TS_TBLOCK); 1492 1493#if 0 /* forget it, sleeping isn't always safe and we don't know when it is */ 1494 if (ISSET(tp->t_iflag, IXOFF)) { 1495 /* 1496 * XXX wait a bit in the hope that the stop 1497 * character (if any) will go out. Waiting 1498 * isn't good since it allows races. This 1499 * will be fixed when the stop character is 1500 * put in a special queue. Don't bother with 1501 * the checks in ttywait() since the timeout 1502 * will save us. 1503 */ 1504 SET(tp->t_state, TS_SO_OCOMPLETE); 1505 ttysleep(tp, TSA_OCOMPLETE(tp), TTOPRI, 1506 "ttyfls", hz / 10); 1507 /* 1508 * Don't try sending the stop character again. 1509 */ 1510 CLR(tp->t_state, TS_TBLOCK); 1511 goto again; 1512 } 1513#endif 1514 } 1515 } 1516 if (rw & FWRITE) { 1517 FLUSHQ(&tp->t_outq); 1518 ttwwakeup(tp); 1519 } 1520 splx(s); 1521} 1522 1523/* 1524 * Copy in the default termios characters. 1525 */ 1526void 1527termioschars(struct termios *t) 1528{ 1529 1530 bcopy(ttydefchars, t->c_cc, sizeof t->c_cc); 1531} 1532 1533/* 1534 * Old interface. 1535 */ 1536void 1537ttychars(struct tty *tp) 1538{ 1539 1540 termioschars(&tp->t_termios); 1541} 1542 1543/* 1544 * Handle input high water. Send stop character for the IXOFF case. Turn 1545 * on our input flow control bit and propagate the changes to the driver. 1546 * XXX the stop character should be put in a special high priority queue. 1547 */ 1548void 1549ttyblock(struct tty *tp) 1550{ 1551 1552 SET(tp->t_state, TS_TBLOCK); 1553 if (ISSET(tp->t_iflag, IXOFF) && tp->t_cc[VSTOP] != _POSIX_VDISABLE && 1554 putc(tp->t_cc[VSTOP], &tp->t_outq) != 0) 1555 CLR(tp->t_state, TS_TBLOCK); /* try again later */ 1556 ttstart(tp); 1557} 1558 1559/* 1560 * Handle input low water. Send start character for the IXOFF case. Turn 1561 * off our input flow control bit and propagate the changes to the driver. 1562 * XXX the start character should be put in a special high priority queue. 1563 */ 1564static void 1565ttyunblock(struct tty *tp) 1566{ 1567 1568 CLR(tp->t_state, TS_TBLOCK); 1569 if (ISSET(tp->t_iflag, IXOFF) && tp->t_cc[VSTART] != _POSIX_VDISABLE && 1570 putc(tp->t_cc[VSTART], &tp->t_outq) != 0) 1571 SET(tp->t_state, TS_TBLOCK); /* try again later */ 1572 ttstart(tp); 1573} 1574 1575#ifdef notyet 1576/* Not used by any current (i386) drivers. */ 1577/* 1578 * Restart after an inter-char delay. 1579 */ 1580void 1581ttrstrt(void *tp_arg) 1582{ 1583 struct tty *tp; 1584 int s; 1585 1586 KASSERT(tp_arg != NULL, ("ttrstrt")); 1587 1588 tp = tp_arg; 1589 s = spltty(); 1590 1591 CLR(tp->t_state, TS_TIMEOUT); 1592 ttstart(tp); 1593 1594 splx(s); 1595} 1596#endif 1597 1598int 1599ttstart(struct tty *tp) 1600{ 1601 1602 tt_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 tt_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 if (slp != 0) { 1856 struct timeval tv; /* XXX style bug. */ 1857 1858 tv.tv_sec = slp / 1000000; 1859 tv.tv_usec = slp % 1000000; 1860 slp = tvtohz(&tv); 1861 /* 1862 * XXX bad variable names. slp was the timeout in 1863 * usec. Now it is the timeout in ticks. 1864 */ 1865 } 1866 goto sleep; 1867 } 1868 if (qp->c_cc <= 0) { 1869sleep: 1870 /* 1871 * There is no input, or not enough input and we can block. 1872 */ 1873 error = ttysleep(tp, TSA_HUP_OR_INPUT(tp), TTIPRI | PCATCH, 1874 ISSET(tp->t_state, TS_CONNECTED) ? 1875 "ttyin" : "ttyhup", (int)slp); 1876 splx(s); 1877 if (error == EWOULDBLOCK) 1878 error = 0; 1879 else if (error) 1880 return (error); 1881 /* 1882 * XXX what happens if another process eats some input 1883 * while we are asleep (not just here)? It would be 1884 * safest to detect changes and reset our state variables 1885 * (has_stime and last_cc). 1886 */ 1887 slp = 0; 1888 goto loop; 1889 } 1890read: 1891 splx(s); 1892 /* 1893 * Input present, check for input mapping and processing. 1894 */ 1895 first = 1; 1896 if (ISSET(lflag, ICANON | ISIG)) 1897 goto slowcase; 1898 for (;;) { 1899 char ibuf[IBUFSIZ]; 1900 int icc; 1901 1902 icc = imin(uio->uio_resid, IBUFSIZ); 1903 icc = q_to_b(qp, ibuf, icc); 1904 if (icc <= 0) { 1905 if (first) 1906 goto loop; 1907 break; 1908 } 1909 error = uiomove(ibuf, icc, uio); 1910 /* 1911 * XXX if there was an error then we should ungetc() the 1912 * unmoved chars and reduce icc here. 1913 */ 1914 if (error) 1915 break; 1916 if (uio->uio_resid == 0) 1917 break; 1918 first = 0; 1919 } 1920 goto out; 1921slowcase: 1922 for (;;) { 1923 c = getc(qp); 1924 if (c < 0) { 1925 if (first) 1926 goto loop; 1927 break; 1928 } 1929 /* 1930 * delayed suspend (^Y) 1931 */ 1932 if (CCEQ(cc[VDSUSP], c) && 1933 ISSET(lflag, IEXTEN | ISIG) == (IEXTEN | ISIG)) { 1934 if (tp->t_pgrp != NULL) { 1935 PGRP_LOCK(tp->t_pgrp); 1936 pgsignal(tp->t_pgrp, SIGTSTP, 1); 1937 PGRP_UNLOCK(tp->t_pgrp); 1938 } 1939 if (first) { 1940 error = ttysleep(tp, &lbolt, TTIPRI | PCATCH, 1941 "ttybg3", 0); 1942 if (error) 1943 break; 1944 goto loop; 1945 } 1946 break; 1947 } 1948 /* 1949 * Interpret EOF only in canonical mode. 1950 */ 1951 if (CCEQ(cc[VEOF], c) && ISSET(lflag, ICANON)) 1952 break; 1953 /* 1954 * Give user character. 1955 */ 1956 error = ureadc(c, uio); 1957 if (error) 1958 /* XXX should ungetc(c, qp). */ 1959 break; 1960 if (uio->uio_resid == 0) 1961 break; 1962 /* 1963 * In canonical mode check for a "break character" 1964 * marking the end of a "line of input". 1965 */ 1966 if (ISSET(lflag, ICANON) && TTBREAKC(c, lflag)) 1967 break; 1968 first = 0; 1969 } 1970 1971out: 1972 /* 1973 * Look to unblock input now that (presumably) 1974 * the input queue has gone down. 1975 */ 1976 s = spltty(); 1977 if (ISSET(tp->t_state, TS_TBLOCK) && 1978 tp->t_rawq.c_cc + tp->t_canq.c_cc <= tp->t_ilowat) 1979 ttyunblock(tp); 1980 splx(s); 1981 1982 return (error); 1983} 1984 1985/* 1986 * Check the output queue on tp for space for a kernel message (from uprintf 1987 * or tprintf). Allow some space over the normal hiwater mark so we don't 1988 * lose messages due to normal flow control, but don't let the tty run amok. 1989 * Sleeps here are not interruptible, but we return prematurely if new signals 1990 * arrive. 1991 */ 1992int 1993ttycheckoutq(struct tty *tp, int wait) 1994{ 1995 int hiwat, s; 1996 sigset_t oldmask; 1997 struct thread *td; 1998 struct proc *p; 1999 2000 td = curthread; 2001 p = td->td_proc; 2002 hiwat = tp->t_ohiwat; 2003 SIGEMPTYSET(oldmask); 2004 s = spltty(); 2005 if (wait) { 2006 PROC_LOCK(p); 2007 oldmask = td->td_siglist; 2008 PROC_UNLOCK(p); 2009 } 2010 if (tp->t_outq.c_cc > hiwat + OBUFSIZ + 100) 2011 while (tp->t_outq.c_cc > hiwat) { 2012 ttstart(tp); 2013 if (tp->t_outq.c_cc <= hiwat) 2014 break; 2015 if (!wait) { 2016 splx(s); 2017 return (0); 2018 } 2019 PROC_LOCK(p); 2020 if (!SIGSETEQ(td->td_siglist, oldmask)) { 2021 PROC_UNLOCK(p); 2022 splx(s); 2023 return (0); 2024 } 2025 PROC_UNLOCK(p); 2026 SET(tp->t_state, TS_SO_OLOWAT); 2027 tsleep(TSA_OLOWAT(tp), PZERO - 1, "ttoutq", hz); 2028 } 2029 splx(s); 2030 return (1); 2031} 2032 2033/* 2034 * Process a write call on a tty device. 2035 */ 2036int 2037ttwrite(struct tty *tp, struct uio *uio, int flag) 2038{ 2039 char *cp = NULL; 2040 int cc, ce; 2041 struct thread *td; 2042 struct proc *p; 2043 int i, hiwat, cnt, error, s; 2044 char obuf[OBUFSIZ]; 2045 2046 hiwat = tp->t_ohiwat; 2047 cnt = uio->uio_resid; 2048 error = 0; 2049 cc = 0; 2050 td = curthread; 2051 p = td->td_proc; 2052loop: 2053 s = spltty(); 2054 if (ISSET(tp->t_state, TS_ZOMBIE)) { 2055 splx(s); 2056 if (uio->uio_resid == cnt) 2057 error = EIO; 2058 goto out; 2059 } 2060 if (!ISSET(tp->t_state, TS_CONNECTED)) { 2061 if (flag & IO_NDELAY) { 2062 splx(s); 2063 error = EWOULDBLOCK; 2064 goto out; 2065 } 2066 error = ttysleep(tp, TSA_CARR_ON(tp), TTIPRI | PCATCH, 2067 "ttywdcd", 0); 2068 splx(s); 2069 if (error) 2070 goto out; 2071 goto loop; 2072 } 2073 splx(s); 2074 /* 2075 * Hang the process if it's in the background. 2076 */ 2077 sx_slock(&proctree_lock); 2078 PROC_LOCK(p); 2079 if (isbackground(p, tp) && 2080 ISSET(tp->t_lflag, TOSTOP) && !(p->p_flag & P_PPWAIT) && 2081 !SIGISMEMBER(p->p_sigacts->ps_sigignore, SIGTTOU) && 2082 !SIGISMEMBER(td->td_sigmask, SIGTTOU)) { 2083 if (p->p_pgrp->pg_jobc == 0) { 2084 PROC_UNLOCK(p); 2085 sx_sunlock(&proctree_lock); 2086 error = EIO; 2087 goto out; 2088 } 2089 PROC_UNLOCK(p); 2090 PGRP_LOCK(p->p_pgrp); 2091 sx_sunlock(&proctree_lock); 2092 pgsignal(p->p_pgrp, SIGTTOU, 1); 2093 PGRP_UNLOCK(p->p_pgrp); 2094 error = ttysleep(tp, &lbolt, TTIPRI | PCATCH, "ttybg4", 0); 2095 if (error) 2096 goto out; 2097 goto loop; 2098 } else { 2099 PROC_UNLOCK(p); 2100 sx_sunlock(&proctree_lock); 2101 } 2102 /* 2103 * Process the user's data in at most OBUFSIZ chunks. Perform any 2104 * output translation. Keep track of high water mark, sleep on 2105 * overflow awaiting device aid in acquiring new space. 2106 */ 2107 while (uio->uio_resid > 0 || cc > 0) { 2108 if (ISSET(tp->t_lflag, FLUSHO)) { 2109 uio->uio_resid = 0; 2110 return (0); 2111 } 2112 if (tp->t_outq.c_cc > hiwat) 2113 goto ovhiwat; 2114 /* 2115 * Grab a hunk of data from the user, unless we have some 2116 * leftover from last time. 2117 */ 2118 if (cc == 0) { 2119 cc = imin(uio->uio_resid, OBUFSIZ); 2120 cp = obuf; 2121 error = uiomove(cp, cc, uio); 2122 if (error) { 2123 cc = 0; 2124 break; 2125 } 2126 } 2127 /* 2128 * If nothing fancy need be done, grab those characters we 2129 * can handle without any of ttyoutput's processing and 2130 * just transfer them to the output q. For those chars 2131 * which require special processing (as indicated by the 2132 * bits in char_type), call ttyoutput. After processing 2133 * a hunk of data, look for FLUSHO so ^O's will take effect 2134 * immediately. 2135 */ 2136 while (cc > 0) { 2137 if (!ISSET(tp->t_oflag, OPOST)) 2138 ce = cc; 2139 else { 2140 ce = cc - scanc((u_int)cc, (u_char *)cp, 2141 char_type, CCLASSMASK); 2142 /* 2143 * If ce is zero, then we're processing 2144 * a special character through ttyoutput. 2145 */ 2146 if (ce == 0) { 2147 tp->t_rocount = 0; 2148 if (ttyoutput(*cp, tp) >= 0) { 2149 /* No Clists, wait a bit. */ 2150 ttstart(tp); 2151 if (flag & IO_NDELAY) { 2152 error = EWOULDBLOCK; 2153 goto out; 2154 } 2155 error = ttysleep(tp, &lbolt, 2156 TTOPRI|PCATCH, 2157 "ttybf1", 0); 2158 if (error) 2159 goto out; 2160 goto loop; 2161 } 2162 cp++; 2163 cc--; 2164 if (ISSET(tp->t_lflag, FLUSHO) || 2165 tp->t_outq.c_cc > hiwat) 2166 goto ovhiwat; 2167 continue; 2168 } 2169 } 2170 /* 2171 * A bunch of normal characters have been found. 2172 * Transfer them en masse to the output queue and 2173 * continue processing at the top of the loop. 2174 * If there are any further characters in this 2175 * <= OBUFSIZ chunk, the first should be a character 2176 * requiring special handling by ttyoutput. 2177 */ 2178 tp->t_rocount = 0; 2179 i = b_to_q(cp, ce, &tp->t_outq); 2180 ce -= i; 2181 tp->t_column += ce; 2182 cp += ce, cc -= ce, tk_nout += ce; 2183 tp->t_outcc += ce; 2184 if (i > 0) { 2185 /* No Clists, wait a bit. */ 2186 ttstart(tp); 2187 if (flag & IO_NDELAY) { 2188 error = EWOULDBLOCK; 2189 goto out; 2190 } 2191 error = ttysleep(tp, &lbolt, TTOPRI | PCATCH, 2192 "ttybf2", 0); 2193 if (error) 2194 goto out; 2195 goto loop; 2196 } 2197 if (ISSET(tp->t_lflag, FLUSHO) || 2198 tp->t_outq.c_cc > hiwat) 2199 break; 2200 } 2201 ttstart(tp); 2202 } 2203out: 2204 /* 2205 * If cc is nonzero, we leave the uio structure inconsistent, as the 2206 * offset and iov pointers have moved forward, but it doesn't matter 2207 * (the call will either return short or restart with a new uio). 2208 */ 2209 uio->uio_resid += cc; 2210 return (error); 2211 2212ovhiwat: 2213 ttstart(tp); 2214 s = spltty(); 2215 /* 2216 * This can only occur if FLUSHO is set in t_lflag, 2217 * or if ttstart/oproc is synchronous (or very fast). 2218 */ 2219 if (tp->t_outq.c_cc <= hiwat) { 2220 splx(s); 2221 goto loop; 2222 } 2223 if (flag & IO_NDELAY) { 2224 splx(s); 2225 uio->uio_resid += cc; 2226 return (uio->uio_resid == cnt ? EWOULDBLOCK : 0); 2227 } 2228 SET(tp->t_state, TS_SO_OLOWAT); 2229 error = ttysleep(tp, TSA_OLOWAT(tp), TTOPRI | PCATCH, "ttywri", 2230 tp->t_timeout); 2231 splx(s); 2232 if (error == EWOULDBLOCK) 2233 error = EIO; 2234 if (error) 2235 goto out; 2236 goto loop; 2237} 2238 2239/* 2240 * Rubout one character from the rawq of tp 2241 * as cleanly as possible. 2242 */ 2243static void 2244ttyrub(int c, struct tty *tp) 2245{ 2246 char *cp; 2247 int savecol; 2248 int tabc, s; 2249 2250 if (!ISSET(tp->t_lflag, ECHO) || ISSET(tp->t_lflag, EXTPROC)) 2251 return; 2252 CLR(tp->t_lflag, FLUSHO); 2253 if (ISSET(tp->t_lflag, ECHOE)) { 2254 if (tp->t_rocount == 0) { 2255 /* 2256 * Screwed by ttwrite; retype 2257 */ 2258 ttyretype(tp); 2259 return; 2260 } 2261 if (c == ('\t' | TTY_QUOTE) || c == ('\n' | TTY_QUOTE)) 2262 ttyrubo(tp, 2); 2263 else { 2264 CLR(c, ~TTY_CHARMASK); 2265 switch (CCLASS(c)) { 2266 case ORDINARY: 2267 ttyrubo(tp, 1); 2268 break; 2269 case BACKSPACE: 2270 case CONTROL: 2271 case NEWLINE: 2272 case RETURN: 2273 case VTAB: 2274 if (ISSET(tp->t_lflag, ECHOCTL)) 2275 ttyrubo(tp, 2); 2276 break; 2277 case TAB: 2278 if (tp->t_rocount < tp->t_rawq.c_cc) { 2279 ttyretype(tp); 2280 return; 2281 } 2282 s = spltty(); 2283 savecol = tp->t_column; 2284 SET(tp->t_state, TS_CNTTB); 2285 SET(tp->t_lflag, FLUSHO); 2286 tp->t_column = tp->t_rocol; 2287 cp = tp->t_rawq.c_cf; 2288 if (cp) 2289 tabc = *cp; /* XXX FIX NEXTC */ 2290 for (; cp; cp = nextc(&tp->t_rawq, cp, &tabc)) 2291 ttyecho(tabc, tp); 2292 CLR(tp->t_lflag, FLUSHO); 2293 CLR(tp->t_state, TS_CNTTB); 2294 splx(s); 2295 2296 /* savecol will now be length of the tab. */ 2297 savecol -= tp->t_column; 2298 tp->t_column += savecol; 2299 if (savecol > 8) 2300 savecol = 8; /* overflow screw */ 2301 while (--savecol >= 0) 2302 (void)ttyoutput('\b', tp); 2303 break; 2304 default: /* XXX */ 2305#define PANICSTR "ttyrub: would panic c = %d, val = %d\n" 2306 (void)printf(PANICSTR, c, CCLASS(c)); 2307#ifdef notdef 2308 panic(PANICSTR, c, CCLASS(c)); 2309#endif 2310 } 2311 } 2312 } else if (ISSET(tp->t_lflag, ECHOPRT)) { 2313 if (!ISSET(tp->t_state, TS_ERASE)) { 2314 SET(tp->t_state, TS_ERASE); 2315 (void)ttyoutput('\\', tp); 2316 } 2317 ttyecho(c, tp); 2318 } else { 2319 ttyecho(tp->t_cc[VERASE], tp); 2320 /* 2321 * This code may be executed not only when an ERASE key 2322 * is pressed, but also when ^U (KILL) or ^W (WERASE) are. 2323 * So, I didn't think it was worthwhile to pass the extra 2324 * information (which would need an extra parameter, 2325 * changing every call) needed to distinguish the ERASE2 2326 * case from the ERASE. 2327 */ 2328 } 2329 --tp->t_rocount; 2330} 2331 2332/* 2333 * Back over cnt characters, erasing them. 2334 */ 2335static void 2336ttyrubo(struct tty *tp, int cnt) 2337{ 2338 2339 while (cnt-- > 0) { 2340 (void)ttyoutput('\b', tp); 2341 (void)ttyoutput(' ', tp); 2342 (void)ttyoutput('\b', tp); 2343 } 2344} 2345 2346/* 2347 * ttyretype -- 2348 * Reprint the rawq line. Note, it is assumed that c_cc has already 2349 * been checked. 2350 */ 2351static void 2352ttyretype(struct tty *tp) 2353{ 2354 char *cp; 2355 int s, c; 2356 2357 /* Echo the reprint character. */ 2358 if (tp->t_cc[VREPRINT] != _POSIX_VDISABLE) 2359 ttyecho(tp->t_cc[VREPRINT], tp); 2360 2361 (void)ttyoutput('\n', tp); 2362 2363 /* 2364 * XXX 2365 * FIX: NEXTC IS BROKEN - DOESN'T CHECK QUOTE 2366 * BIT OF FIRST CHAR. 2367 */ 2368 s = spltty(); 2369 for (cp = tp->t_canq.c_cf, c = (cp != NULL ? *cp : 0); 2370 cp != NULL; cp = nextc(&tp->t_canq, cp, &c)) 2371 ttyecho(c, tp); 2372 for (cp = tp->t_rawq.c_cf, c = (cp != NULL ? *cp : 0); 2373 cp != NULL; cp = nextc(&tp->t_rawq, cp, &c)) 2374 ttyecho(c, tp); 2375 CLR(tp->t_state, TS_ERASE); 2376 splx(s); 2377 2378 tp->t_rocount = tp->t_rawq.c_cc; 2379 tp->t_rocol = 0; 2380} 2381 2382/* 2383 * Echo a typed character to the terminal. 2384 */ 2385static void 2386ttyecho(int c, struct tty *tp) 2387{ 2388 2389 if (!ISSET(tp->t_state, TS_CNTTB)) 2390 CLR(tp->t_lflag, FLUSHO); 2391 if ((!ISSET(tp->t_lflag, ECHO) && 2392 (c != '\n' || !ISSET(tp->t_lflag, ECHONL))) || 2393 ISSET(tp->t_lflag, EXTPROC)) 2394 return; 2395 if (ISSET(tp->t_lflag, ECHOCTL) && 2396 ((ISSET(c, TTY_CHARMASK) <= 037 && c != '\t' && c != '\n') || 2397 ISSET(c, TTY_CHARMASK) == 0177)) { 2398 (void)ttyoutput('^', tp); 2399 CLR(c, ~TTY_CHARMASK); 2400 if (c == 0177) 2401 c = '?'; 2402 else 2403 c += 'A' - 1; 2404 } 2405 (void)ttyoutput(c, tp); 2406} 2407 2408/* 2409 * Wake up any readers on a tty. 2410 */ 2411void 2412ttwakeup(struct tty *tp) 2413{ 2414 2415 if (SEL_WAITING(&tp->t_rsel)) 2416 selwakeuppri(&tp->t_rsel, TTIPRI); 2417 if (ISSET(tp->t_state, TS_ASYNC) && tp->t_sigio != NULL) 2418 pgsigio(&tp->t_sigio, SIGIO, (tp->t_session != NULL)); 2419 wakeup(TSA_HUP_OR_INPUT(tp)); 2420 KNOTE_UNLOCKED(&tp->t_rsel.si_note, 0); 2421} 2422 2423/* 2424 * Wake up any writers on a tty. 2425 */ 2426void 2427ttwwakeup(struct tty *tp) 2428{ 2429 2430 if (SEL_WAITING(&tp->t_wsel) && tp->t_outq.c_cc <= tp->t_olowat) 2431 selwakeuppri(&tp->t_wsel, TTOPRI); 2432 if (ISSET(tp->t_state, TS_ASYNC) && tp->t_sigio != NULL) 2433 pgsigio(&tp->t_sigio, SIGIO, (tp->t_session != NULL)); 2434 if (ISSET(tp->t_state, TS_BUSY | TS_SO_OCOMPLETE) == 2435 TS_SO_OCOMPLETE && tp->t_outq.c_cc == 0) { 2436 CLR(tp->t_state, TS_SO_OCOMPLETE); 2437 wakeup(TSA_OCOMPLETE(tp)); 2438 } 2439 if (ISSET(tp->t_state, TS_SO_OLOWAT) && 2440 tp->t_outq.c_cc <= tp->t_olowat) { 2441 CLR(tp->t_state, TS_SO_OLOWAT); 2442 wakeup(TSA_OLOWAT(tp)); 2443 } 2444 KNOTE_UNLOCKED(&tp->t_wsel.si_note, 0); 2445} 2446 2447/* 2448 * Look up a code for a specified speed in a conversion table; 2449 * used by drivers to map software speed values to hardware parameters. 2450 */ 2451int 2452ttspeedtab(int speed, struct speedtab *table) 2453{ 2454 2455 for ( ; table->sp_speed != -1; table++) 2456 if (table->sp_speed == speed) 2457 return (table->sp_code); 2458 return (-1); 2459} 2460 2461/* 2462 * Set input and output watermarks and buffer sizes. For input, the 2463 * high watermark is about one second's worth of input above empty, the 2464 * low watermark is slightly below high water, and the buffer size is a 2465 * driver-dependent amount above high water. For output, the watermarks 2466 * are near the ends of the buffer, with about 1 second's worth of input 2467 * between them. All this only applies to the standard line discipline. 2468 */ 2469void 2470ttsetwater(struct tty *tp) 2471{ 2472 int cps, ttmaxhiwat, x; 2473 2474 /* Input. */ 2475 clist_alloc_cblocks(&tp->t_canq, TTYHOG, 512); 2476 switch (tp->t_ispeedwat) { 2477 case (speed_t)-1: 2478 cps = tp->t_ispeed / 10; 2479 break; 2480 case 0: 2481 /* 2482 * This case is for old drivers that don't know about 2483 * t_ispeedwat. Arrange for them to get the old buffer 2484 * sizes and watermarks. 2485 */ 2486 cps = TTYHOG - 2 * 256; 2487 tp->t_ififosize = 2 * 256; 2488 break; 2489 default: 2490 cps = tp->t_ispeedwat / 10; 2491 break; 2492 } 2493 tp->t_ihiwat = cps; 2494 tp->t_ilowat = 7 * cps / 8; 2495 x = cps + tp->t_ififosize; 2496 clist_alloc_cblocks(&tp->t_rawq, x, x); 2497 2498 /* Output. */ 2499 switch (tp->t_ospeedwat) { 2500 case (speed_t)-1: 2501 cps = tp->t_ospeed / 10; 2502 ttmaxhiwat = 2 * TTMAXHIWAT; 2503 break; 2504 case 0: 2505 cps = tp->t_ospeed / 10; 2506 ttmaxhiwat = TTMAXHIWAT; 2507 break; 2508 default: 2509 cps = tp->t_ospeedwat / 10; 2510 ttmaxhiwat = 8 * TTMAXHIWAT; 2511 break; 2512 } 2513#define CLAMP(x, h, l) ((x) > h ? h : ((x) < l) ? l : (x)) 2514 tp->t_olowat = x = CLAMP(cps / 2, TTMAXLOWAT, TTMINLOWAT); 2515 x += cps; 2516 x = CLAMP(x, ttmaxhiwat, TTMINHIWAT); /* XXX clamps are too magic */ 2517 tp->t_ohiwat = roundup(x, CBSIZE); /* XXX for compat */ 2518 x = imax(tp->t_ohiwat, TTMAXHIWAT); /* XXX for compat/safety */ 2519 x += OBUFSIZ + 100; 2520 clist_alloc_cblocks(&tp->t_outq, x, x); 2521#undef CLAMP 2522} 2523 2524/* 2525 * Report on state of foreground process group. 2526 */ 2527void 2528ttyinfo(struct tty *tp) 2529{ 2530 struct timeval utime, stime; 2531 struct proc *p, *pick; 2532 struct thread *td; 2533 const char *stateprefix, *state; 2534 long rss; 2535 int load, pctcpu; 2536 pid_t pid; 2537 char comm[MAXCOMLEN + 1]; 2538 2539 if (ttycheckoutq(tp,0) == 0) 2540 return; 2541 2542 /* Print load average. */ 2543 load = (averunnable.ldavg[0] * 100 + FSCALE / 2) >> FSHIFT; 2544 ttyprintf(tp, "load: %d.%02d ", load / 100, load % 100); 2545 2546 /* 2547 * On return following a ttyprintf(), we set tp->t_rocount to 0 so 2548 * that pending input will be retyped on BS. 2549 */ 2550 if (tp->t_session == NULL) { 2551 ttyprintf(tp, "not a controlling terminal\n"); 2552 tp->t_rocount = 0; 2553 return; 2554 } 2555 if (tp->t_pgrp == NULL) { 2556 ttyprintf(tp, "no foreground process group\n"); 2557 tp->t_rocount = 0; 2558 return; 2559 } 2560 PGRP_LOCK(tp->t_pgrp); 2561 if (LIST_EMPTY(&tp->t_pgrp->pg_members)) { 2562 PGRP_UNLOCK(tp->t_pgrp); 2563 ttyprintf(tp, "empty foreground process group\n"); 2564 tp->t_rocount = 0; 2565 return; 2566 } 2567 2568 /* 2569 * Pick the most interesting process and copy some of its 2570 * state for printing later. sched_lock must be held for 2571 * most parts of this. Holding it throughout is simplest 2572 * and prevents even unimportant inconsistencies in the 2573 * copy of the state, but may increase interrupt latency 2574 * too much. 2575 */ 2576 pick = NULL; 2577 mtx_lock_spin(&sched_lock); 2578 LIST_FOREACH(p, &tp->t_pgrp->pg_members, p_pglist) 2579 if (proc_compare(pick, p)) 2580 pick = p; 2581 2582 td = FIRST_THREAD_IN_PROC(pick); /* XXXKSE */ 2583#if 0 2584 KASSERT(td != NULL, ("ttyinfo: no thread")); 2585#else 2586 if (td == NULL) { 2587 mtx_unlock_spin(&sched_lock); 2588 PGRP_UNLOCK(tp->t_pgrp); 2589 ttyprintf(tp, "foreground process without thread\n"); 2590 tp->t_rocount = 0; 2591 return; 2592 } 2593#endif 2594 stateprefix = ""; 2595 if (TD_IS_RUNNING(td)) 2596 state = "running"; 2597 else if (TD_ON_RUNQ(td) || TD_CAN_RUN(td)) 2598 state = "runnable"; 2599 else if (TD_IS_SLEEPING(td)) { 2600 /* XXX: If we're sleeping, are we ever not in a queue? */ 2601 if (TD_ON_SLEEPQ(td)) 2602 state = td->td_wmesg; 2603 else 2604 state = "sleeping without queue"; 2605 } else if (TD_ON_LOCK(td)) { 2606 state = td->td_lockname; 2607 stateprefix = "*"; 2608 } else if (TD_IS_SUSPENDED(td)) 2609 state = "suspended"; 2610 else if (TD_AWAITING_INTR(td)) 2611 state = "intrwait"; 2612 else 2613 state = "unknown"; 2614 pctcpu = (sched_pctcpu(td) * 10000 + FSCALE / 2) >> FSHIFT; 2615 if (pick->p_state == PRS_NEW || pick->p_state == PRS_ZOMBIE) 2616 rss = 0; 2617 else 2618 rss = pgtok(vmspace_resident_count(pick->p_vmspace)); 2619 mtx_unlock_spin(&sched_lock); 2620 PROC_LOCK(pick); 2621 PGRP_UNLOCK(tp->t_pgrp); 2622 calcru(pick, &utime, &stime); 2623 pid = pick->p_pid; 2624 bcopy(pick->p_comm, comm, sizeof(comm)); 2625 PROC_UNLOCK(pick); 2626 2627 /* Print command, pid, state, utime, stime, %cpu, and rss. */ 2628 ttyprintf(tp, 2629 " cmd: %s %d [%s%s] %ld.%02ldu %ld.%02lds %d%% %ldk\n", 2630 comm, pid, stateprefix, state, 2631 (long)utime.tv_sec, utime.tv_usec / 10000, 2632 (long)stime.tv_sec, stime.tv_usec / 10000, 2633 pctcpu / 100, rss); 2634 tp->t_rocount = 0; 2635} 2636 2637/* 2638 * Returns 1 if p2 is "better" than p1 2639 * 2640 * The algorithm for picking the "interesting" process is thus: 2641 * 2642 * 1) Only foreground processes are eligible - implied. 2643 * 2) Runnable processes are favored over anything else. The runner 2644 * with the highest cpu utilization is picked (p_estcpu). Ties are 2645 * broken by picking the highest pid. 2646 * 3) The sleeper with the shortest sleep time is next. With ties, 2647 * we pick out just "short-term" sleepers (P_SINTR == 0). 2648 * 4) Further ties are broken by picking the highest pid. 2649 */ 2650#define ISRUN(p, val) \ 2651do { \ 2652 struct thread *td; \ 2653 val = 0; \ 2654 FOREACH_THREAD_IN_PROC(p, td) { \ 2655 if (TD_ON_RUNQ(td) || \ 2656 TD_IS_RUNNING(td)) { \ 2657 val = 1; \ 2658 break; \ 2659 } \ 2660 } \ 2661} while (0) 2662 2663#define TESTAB(a, b) ((a)<<1 | (b)) 2664#define ONLYA 2 2665#define ONLYB 1 2666#define BOTH 3 2667 2668static int 2669proc_compare(struct proc *p1, struct proc *p2) 2670{ 2671 2672 int esta, estb; 2673#ifdef KSE 2674 struct ksegrp *kg; 2675#else 2676 struct thread *td; 2677#endif 2678 mtx_assert(&sched_lock, MA_OWNED); 2679 if (p1 == NULL) 2680 return (1); 2681 2682 ISRUN(p1, esta); 2683 ISRUN(p2, estb); 2684 2685 /* 2686 * see if at least one of them is runnable 2687 */ 2688 switch (TESTAB(esta, estb)) { 2689 case ONLYA: 2690 return (0); 2691 case ONLYB: 2692 return (1); 2693 case BOTH: 2694 /* 2695 * tie - favor one with highest recent cpu utilization 2696 */ 2697 esta = estb = 0; 2698#ifdef KSE 2699 FOREACH_KSEGRP_IN_PROC(p1,kg) { 2700 esta += kg->kg_estcpu; 2701 } 2702 FOREACH_KSEGRP_IN_PROC(p2,kg) { 2703 estb += kg->kg_estcpu; 2704 } 2705#else 2706 FOREACH_THREAD_IN_PROC(p1, td) 2707 esta += td->td_estcpu; 2708 FOREACH_THREAD_IN_PROC(p2, td) 2709 estb += td->td_estcpu; 2710#endif 2711 if (estb > esta) 2712 return (1); 2713 if (esta > estb) 2714 return (0); 2715 return (p2->p_pid > p1->p_pid); /* tie - return highest pid */ 2716 } 2717 /* 2718 * weed out zombies 2719 */ 2720 switch (TESTAB(p1->p_state == PRS_ZOMBIE, p2->p_state == PRS_ZOMBIE)) { 2721 case ONLYA: 2722 return (1); 2723 case ONLYB: 2724 return (0); 2725 case BOTH: 2726 return (p2->p_pid > p1->p_pid); /* tie - return highest pid */ 2727 } 2728 2729#if 0 /* XXXKSE */ 2730 /* 2731 * pick the one with the smallest sleep time 2732 */ 2733 if (p2->p_slptime > p1->p_slptime) 2734 return (0); 2735 if (p1->p_slptime > p2->p_slptime) 2736 return (1); 2737 /* 2738 * favor one sleeping in a non-interruptible sleep 2739 */ 2740 if (p1->p_sflag & PS_SINTR && (p2->p_sflag & PS_SINTR) == 0) 2741 return (1); 2742 if (p2->p_sflag & PS_SINTR && (p1->p_sflag & PS_SINTR) == 0) 2743 return (0); 2744#endif 2745 return (p2->p_pid > p1->p_pid); /* tie - return highest pid */ 2746} 2747 2748/* 2749 * Output char to tty; console putchar style. 2750 */ 2751int 2752tputchar(int c, struct tty *tp) 2753{ 2754 int s; 2755 2756 s = spltty(); 2757 if (!ISSET(tp->t_state, TS_CONNECTED)) { 2758 splx(s); 2759 return (-1); 2760 } 2761 if (c == '\n') 2762 (void)ttyoutput('\r', tp); 2763 (void)ttyoutput(c, tp); 2764 ttstart(tp); 2765 splx(s); 2766 return (0); 2767} 2768 2769/* 2770 * Sleep on chan, returning ERESTART if tty changed while we napped and 2771 * returning any errors (e.g. EINTR/EWOULDBLOCK) reported by tsleep. If 2772 * the tty is revoked, restarting a pending call will redo validation done 2773 * at the start of the call. 2774 */ 2775int 2776ttysleep(struct tty *tp, void *chan, int pri, char *wmesg, int timo) 2777{ 2778 int error; 2779 int gen; 2780 2781 gen = tp->t_gen; 2782 error = tsleep(chan, pri, wmesg, timo); 2783 if (tp->t_state & TS_GONE) 2784 return (ENXIO); 2785 if (error) 2786 return (error); 2787 return (tp->t_gen == gen ? 0 : ERESTART); 2788} 2789 2790/* 2791 * Gain a reference to a TTY 2792 */ 2793int 2794ttyref(struct tty *tp) 2795{ 2796 int i; 2797 2798 mtx_lock(&tp->t_mtx); 2799 KASSERT(tp->t_refcnt > 0, 2800 ("ttyref(): tty refcnt is %d (%s)", 2801 tp->t_refcnt, tp->t_dev != NULL ? devtoname(tp->t_dev) : "??")); 2802 i = ++tp->t_refcnt; 2803 mtx_unlock(&tp->t_mtx); 2804 return (i); 2805} 2806 2807/* 2808 * Drop a reference to a TTY. 2809 * When reference count drops to zero, we free it. 2810 */ 2811int 2812ttyrel(struct tty *tp) 2813{ 2814 int i; 2815 2816 mtx_lock(&tty_list_mutex); 2817 mtx_lock(&tp->t_mtx); 2818 KASSERT(tp->t_refcnt > 0, 2819 ("ttyrel(): tty refcnt is %d (%s)", 2820 tp->t_refcnt, tp->t_dev != NULL ? devtoname(tp->t_dev) : "??")); 2821 i = --tp->t_refcnt; 2822 if (i != 0) { 2823 mtx_unlock(&tp->t_mtx); 2824 mtx_unlock(&tty_list_mutex); 2825 return (i); 2826 } 2827 TAILQ_REMOVE(&tty_list, tp, t_list); 2828 mtx_unlock(&tp->t_mtx); 2829 mtx_unlock(&tty_list_mutex); 2830 knlist_destroy(&tp->t_rsel.si_note); 2831 knlist_destroy(&tp->t_wsel.si_note); 2832 mtx_destroy(&tp->t_mtx); 2833 free(tp, M_TTYS); 2834 return (i); 2835} 2836 2837/* 2838 * Allocate a tty struct. Clists in the struct will be allocated by 2839 * tty_open(). 2840 */ 2841struct tty * 2842ttyalloc() 2843{ 2844 struct tty *tp; 2845 2846 tp = malloc(sizeof *tp, M_TTYS, M_WAITOK | M_ZERO); 2847 mtx_init(&tp->t_mtx, "tty", NULL, MTX_DEF); 2848 2849 /* 2850 * Set up the initial state 2851 */ 2852 tp->t_refcnt = 1; 2853 tp->t_timeout = -1; 2854 tp->t_dtr_wait = 3 * hz; 2855 2856 ttyinitmode(tp, 0, 0); 2857 bcopy(ttydefchars, tp->t_init_in.c_cc, sizeof tp->t_init_in.c_cc); 2858 2859 /* Make callout the same as callin */ 2860 tp->t_init_out = tp->t_init_in; 2861 2862 mtx_lock(&tty_list_mutex); 2863 TAILQ_INSERT_TAIL(&tty_list, tp, t_list); 2864 mtx_unlock(&tty_list_mutex); 2865 knlist_init(&tp->t_rsel.si_note, &tp->t_mtx, NULL, NULL, NULL); 2866 knlist_init(&tp->t_wsel.si_note, &tp->t_mtx, NULL, NULL, NULL); 2867 return (tp); 2868} 2869 2870static void 2871ttypurge(struct cdev *dev) 2872{ 2873 2874 if (dev->si_tty == NULL) 2875 return; 2876 ttygone(dev->si_tty); 2877} 2878 2879/* 2880 * ttycreate() 2881 * 2882 * Create the device entries for this tty thereby opening it for business. 2883 * 2884 * The flags argument controls if "cua" units are created. 2885 * 2886 * The t_sc filed is copied to si_drv1 in the created cdevs. This 2887 * is particularly important for ->t_cioctl() users. 2888 * 2889 * XXX: implement the init and lock devices by cloning. 2890 */ 2891 2892int 2893ttycreate(struct tty *tp, int flags, const char *fmt, ...) 2894{ 2895 char namebuf[SPECNAMELEN - 3]; /* XXX space for "tty" */ 2896 struct cdevsw *csw = NULL; 2897 int unit = 0; 2898 va_list ap; 2899 struct cdev *cp; 2900 int i, minor, sminor, sunit; 2901 2902 mtx_assert(&Giant, MA_OWNED); 2903 2904 if (tty_unit == NULL) 2905 tty_unit = new_unrhdr(0, 0xffff, NULL); 2906 2907 sunit = alloc_unr(tty_unit); 2908 tp->t_devunit = sunit; 2909 2910 if (csw == NULL) { 2911 csw = &tty_cdevsw; 2912 unit = sunit; 2913 } 2914 KASSERT(csw->d_purge == NULL || csw->d_purge == ttypurge, 2915 ("tty should not have d_purge")); 2916 2917 csw->d_purge = ttypurge; 2918 2919 minor = unit2minor(unit); 2920 sminor = unit2minor(sunit); 2921 va_start(ap, fmt); 2922 i = vsnrprintf(namebuf, sizeof namebuf, 32, fmt, ap); 2923 va_end(ap); 2924 KASSERT(i < sizeof namebuf, ("Too long tty name (%s)", namebuf)); 2925 2926 cp = make_dev(csw, minor, 2927 UID_ROOT, GID_WHEEL, 0600, "tty%s", namebuf); 2928 tp->t_dev = cp; 2929 tp->t_mdev = cp; 2930 cp->si_tty = tp; 2931 cp->si_drv1 = tp->t_sc; 2932 2933 cp = make_dev(&ttys_cdevsw, sminor | MINOR_INIT, 2934 UID_ROOT, GID_WHEEL, 0600, "tty%s.init", namebuf); 2935 dev_depends(tp->t_dev, cp); 2936 cp->si_drv1 = tp->t_sc; 2937 cp->si_drv2 = &tp->t_init_in; 2938 cp->si_tty = tp; 2939 2940 cp = make_dev(&ttys_cdevsw, sminor | MINOR_LOCK, 2941 UID_ROOT, GID_WHEEL, 0600, "tty%s.lock", namebuf); 2942 dev_depends(tp->t_dev, cp); 2943 cp->si_drv1 = tp->t_sc; 2944 cp->si_drv2 = &tp->t_lock_in; 2945 cp->si_tty = tp; 2946 2947 if (flags & TS_CALLOUT) { 2948 cp = make_dev(csw, minor | MINOR_CALLOUT, 2949 UID_UUCP, GID_DIALER, 0660, "cua%s", namebuf); 2950 dev_depends(tp->t_dev, cp); 2951 cp->si_drv1 = tp->t_sc; 2952 cp->si_tty = tp; 2953 2954 cp = make_dev(&ttys_cdevsw, sminor | MINOR_CALLOUT | MINOR_INIT, 2955 UID_UUCP, GID_DIALER, 0660, "cua%s.init", namebuf); 2956 dev_depends(tp->t_dev, cp); 2957 cp->si_drv1 = tp->t_sc; 2958 cp->si_drv2 = &tp->t_init_out; 2959 cp->si_tty = tp; 2960 2961 cp = make_dev(&ttys_cdevsw, sminor | MINOR_CALLOUT | MINOR_LOCK, 2962 UID_UUCP, GID_DIALER, 0660, "cua%s.lock", namebuf); 2963 dev_depends(tp->t_dev, cp); 2964 cp->si_drv1 = tp->t_sc; 2965 cp->si_drv2 = &tp->t_lock_out; 2966 cp->si_tty = tp; 2967 } 2968 2969 return (0); 2970} 2971 2972/* 2973 * This function is called when the hardware disappears. We set a flag 2974 * and wake up stuff so all sleeping threads will notice. 2975 */ 2976void 2977ttygone(struct tty *tp) 2978{ 2979 2980 tp->t_state |= TS_GONE; 2981 wakeup(&tp->t_dtr_wait); 2982 wakeup(TSA_CARR_ON(tp)); 2983 wakeup(TSA_HUP_OR_INPUT(tp)); 2984 wakeup(TSA_OCOMPLETE(tp)); 2985 wakeup(TSA_OLOWAT(tp)); 2986 tt_purge(tp); 2987} 2988 2989/* 2990 * ttyfree() 2991 * 2992 * Called when the driver is ready to free the tty structure. 2993 * 2994 * XXX: This shall sleep until all threads have left the driver. 2995 */ 2996 2997void 2998ttyfree(struct tty *tp) 2999{ 3000 u_int unit; 3001 3002 mtx_assert(&Giant, MA_OWNED); 3003 ttygone(tp); 3004 unit = tp->t_devunit; 3005 destroy_dev(tp->t_mdev); 3006 free_unr(tty_unit, unit); 3007} 3008 3009static int 3010sysctl_kern_ttys(SYSCTL_HANDLER_ARGS) 3011{ 3012 struct tty *tp, *tp2; 3013 struct xtty xt; 3014 int error; 3015 3016 error = 0; 3017 mtx_lock(&tty_list_mutex); 3018 tp = TAILQ_FIRST(&tty_list); 3019 if (tp != NULL) 3020 ttyref(tp); 3021 mtx_unlock(&tty_list_mutex); 3022 while (tp != NULL) { 3023 bzero(&xt, sizeof xt); 3024 xt.xt_size = sizeof xt; 3025#define XT_COPY(field) xt.xt_##field = tp->t_##field 3026 xt.xt_rawcc = tp->t_rawq.c_cc; 3027 xt.xt_cancc = tp->t_canq.c_cc; 3028 xt.xt_outcc = tp->t_outq.c_cc; 3029 XT_COPY(line); 3030 if (tp->t_dev != NULL) 3031 xt.xt_dev = dev2udev(tp->t_dev); 3032 XT_COPY(state); 3033 XT_COPY(flags); 3034 XT_COPY(timeout); 3035 if (tp->t_pgrp != NULL) 3036 xt.xt_pgid = tp->t_pgrp->pg_id; 3037 if (tp->t_session != NULL) 3038 xt.xt_sid = tp->t_session->s_sid; 3039 XT_COPY(termios); 3040 XT_COPY(winsize); 3041 XT_COPY(column); 3042 XT_COPY(rocount); 3043 XT_COPY(rocol); 3044 XT_COPY(ififosize); 3045 XT_COPY(ihiwat); 3046 XT_COPY(ilowat); 3047 XT_COPY(ispeedwat); 3048 XT_COPY(ohiwat); 3049 XT_COPY(olowat); 3050 XT_COPY(ospeedwat); 3051#undef XT_COPY 3052 error = SYSCTL_OUT(req, &xt, sizeof xt); 3053 if (error != 0) { 3054 ttyrel(tp); 3055 return (error); 3056 } 3057 mtx_lock(&tty_list_mutex); 3058 tp2 = TAILQ_NEXT(tp, t_list); 3059 if (tp2 != NULL) 3060 ttyref(tp2); 3061 mtx_unlock(&tty_list_mutex); 3062 ttyrel(tp); 3063 tp = tp2; 3064 } 3065 return (0); 3066} 3067 3068SYSCTL_PROC(_kern, OID_AUTO, ttys, CTLTYPE_OPAQUE|CTLFLAG_RD, 3069 0, 0, sysctl_kern_ttys, "S,xtty", "All ttys"); 3070SYSCTL_LONG(_kern, OID_AUTO, tty_nin, CTLFLAG_RD, 3071 &tk_nin, 0, "Total TTY in characters"); 3072SYSCTL_LONG(_kern, OID_AUTO, tty_nout, CTLFLAG_RD, 3073 &tk_nout, 0, "Total TTY out characters"); 3074 3075void 3076nottystop(struct tty *tp, int rw) 3077{ 3078 3079 return; 3080} 3081 3082int 3083ttyopen(struct cdev *dev, int flag, int mode, struct thread *td) 3084{ 3085 int error; 3086 int s; 3087 struct tty *tp; 3088 3089 tp = dev->si_tty; 3090 3091 s = spltty(); 3092 /* 3093 * We jump to this label after all non-interrupted sleeps to pick 3094 * up any changes of the device state. 3095 */ 3096open_top: 3097 if (tp->t_state & TS_GONE) 3098 return (ENXIO); 3099 error = ttydtrwaitsleep(tp); 3100 if (error) 3101 goto out; 3102 if (tp->t_state & TS_ISOPEN) { 3103 /* 3104 * The device is open, so everything has been initialized. 3105 * Handle conflicts. 3106 */ 3107 if (ISCALLOUT(dev) && !tp->t_actout) 3108 return (EBUSY); 3109 if (tp->t_actout && !ISCALLOUT(dev)) { 3110 if (flag & O_NONBLOCK) 3111 return (EBUSY); 3112 error = tsleep(&tp->t_actout, 3113 TTIPRI | PCATCH, "ttybi", 0); 3114 if (error != 0 || (tp->t_flags & TS_GONE)) 3115 goto out; 3116 goto open_top; 3117 } 3118 if (tp->t_state & TS_XCLUDE && priv_check(td, 3119 PRIV_TTY_EXCLUSIVE)) 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 if (tp->t_modem != NULL) 3131 tt_modem(tp, SER_DTR | SER_RTS, 0); 3132 ++tp->t_wopeners; 3133 error = tt_param(tp, &tp->t_termios); 3134 --tp->t_wopeners; 3135 if (error == 0) 3136 error = tt_open(tp, dev); 3137 if (error != 0) 3138 goto out; 3139 if (ISCALLOUT(dev) || (tt_modem(tp, 0, 0) & SER_DCD)) 3140 ttyld_modem(tp, 1); 3141 } 3142 /* 3143 * Wait for DCD if necessary. 3144 */ 3145 if (!(tp->t_state & TS_CARR_ON) && !ISCALLOUT(dev) 3146 && !(tp->t_cflag & CLOCAL) && !(flag & O_NONBLOCK)) { 3147 ++tp->t_wopeners; 3148 error = tsleep(TSA_CARR_ON(tp), TTIPRI | PCATCH, "ttydcd", 0); 3149 --tp->t_wopeners; 3150 if (error != 0 || (tp->t_state & TS_GONE)) 3151 goto out; 3152 goto open_top; 3153 } 3154 error = ttyld_open(tp, dev); 3155 ttyldoptim(tp); 3156 if (tp->t_state & TS_ISOPEN && ISCALLOUT(dev)) 3157 tp->t_actout = TRUE; 3158out: 3159 splx(s); 3160 if (!(tp->t_state & TS_ISOPEN) && tp->t_wopeners == 0) 3161 tt_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 tt_close(tp); 3174 tp->t_do_timestamp = 0; 3175 if (tp->t_pps != NULL) 3176 tp->t_pps->ppsparam.mode = 0; 3177 tty_close(tp); 3178 return (0); 3179} 3180 3181int 3182ttyread(struct cdev *dev, struct uio *uio, int flag) 3183{ 3184 struct tty *tp; 3185 3186 tp = tty_gettp(dev); 3187 3188 if (tp->t_state & TS_GONE) 3189 return (ENODEV); 3190 return (ttyld_read(tp, uio, flag)); 3191} 3192 3193int 3194ttywrite(struct cdev *dev, struct uio *uio, int flag) 3195{ 3196 struct tty *tp; 3197 3198 tp = tty_gettp(dev); 3199 3200 if (tp->t_state & TS_GONE) 3201 return (ENODEV); 3202 return (ttyld_write(tp, uio, flag)); 3203} 3204 3205int 3206ttyioctl(struct cdev *dev, u_long cmd, caddr_t data, int flag, struct thread *td) 3207{ 3208 struct tty *tp; 3209 int error; 3210 3211 tp = dev->si_tty; 3212 3213 if (cmd == TIOCSETA || cmd == TIOCSETAW || cmd == TIOCSETAF) { 3214 int cc; 3215 struct termios *dt = (struct termios *)data; 3216 struct termios *lt = 3217 ISCALLOUT(dev) ? &tp->t_lock_out : &tp->t_lock_in; 3218 3219 dt->c_iflag = (tp->t_iflag & lt->c_iflag) 3220 | (dt->c_iflag & ~lt->c_iflag); 3221 dt->c_oflag = (tp->t_oflag & lt->c_oflag) 3222 | (dt->c_oflag & ~lt->c_oflag); 3223 dt->c_cflag = (tp->t_cflag & lt->c_cflag) 3224 | (dt->c_cflag & ~lt->c_cflag); 3225 dt->c_lflag = (tp->t_lflag & lt->c_lflag) 3226 | (dt->c_lflag & ~lt->c_lflag); 3227 for (cc = 0; cc < NCCS; ++cc) 3228 if (lt->c_cc[cc] != 0) 3229 dt->c_cc[cc] = tp->t_cc[cc]; 3230 if (lt->c_ispeed != 0) 3231 dt->c_ispeed = tp->t_ispeed; 3232 if (lt->c_ospeed != 0) 3233 dt->c_ospeed = tp->t_ospeed; 3234 } 3235 3236 error = ttyld_ioctl(tp, cmd, data, flag, td); 3237 if (error == ENOIOCTL) 3238 error = ttioctl(tp, cmd, data, flag); 3239 ttyldoptim(tp); 3240 if (error != ENOIOCTL) 3241 return (error); 3242 return (ENOTTY); 3243} 3244 3245void 3246ttyldoptim(struct tty *tp) 3247{ 3248 struct termios *t; 3249 3250 t = &tp->t_termios; 3251 if (!(t->c_iflag & (ICRNL | IGNCR | IMAXBEL | INLCR | ISTRIP | IXON)) 3252 && (!(t->c_iflag & BRKINT) || (t->c_iflag & IGNBRK)) 3253 && (!(t->c_iflag & PARMRK) 3254 || (t->c_iflag & (IGNPAR | IGNBRK)) == (IGNPAR | IGNBRK)) 3255 && !(t->c_lflag & (ECHO | ICANON | IEXTEN | ISIG | PENDIN)) 3256 && linesw[tp->t_line]->l_rint == ttyinput) 3257 tp->t_state |= TS_CAN_BYPASS_L_RINT; 3258 else 3259 tp->t_state &= ~TS_CAN_BYPASS_L_RINT; 3260} 3261 3262static void 3263ttydtrwaitwakeup(void *arg) 3264{ 3265 struct tty *tp; 3266 3267 tp = arg; 3268 tp->t_state &= ~TS_DTR_WAIT; 3269 wakeup(&tp->t_dtr_wait); 3270} 3271 3272 3273void 3274ttydtrwaitstart(struct tty *tp) 3275{ 3276 3277 if (tp->t_dtr_wait == 0) 3278 return; 3279 if (tp->t_state & TS_DTR_WAIT) 3280 return; 3281 timeout(ttydtrwaitwakeup, tp, tp->t_dtr_wait); 3282 tp->t_state |= TS_DTR_WAIT; 3283} 3284 3285int 3286ttydtrwaitsleep(struct tty *tp) 3287{ 3288 int error; 3289 3290 error = 0; 3291 while (error == 0) { 3292 if (tp->t_state & TS_GONE) 3293 error = ENXIO; 3294 else if (!(tp->t_state & TS_DTR_WAIT)) 3295 break; 3296 else 3297 error = tsleep(&tp->t_dtr_wait, TTIPRI | PCATCH, 3298 "dtrwait", 0); 3299 } 3300 return (error); 3301} 3302 3303static int 3304ttysopen(struct cdev *dev, int flag, int mode, struct thread *td) 3305{ 3306 struct tty *tp; 3307 3308 tp = dev->si_tty; 3309 KASSERT(tp != NULL, 3310 ("ttysopen(): no tty pointer on device (%s)", devtoname(dev))); 3311 if (tp->t_state & TS_GONE) 3312 return (ENODEV); 3313 return (0); 3314} 3315 3316static int 3317ttysclose(struct cdev *dev, int flag, int mode, struct thread *td) 3318{ 3319 3320 return (0); 3321} 3322 3323static int 3324ttysrdwr(struct cdev *dev, struct uio *uio, int flag) 3325{ 3326 3327 return (ENODEV); 3328} 3329 3330static int 3331ttysioctl(struct cdev *dev, u_long cmd, caddr_t data, int flag, struct thread *td) 3332{ 3333 struct tty *tp; 3334 int error; 3335 struct termios *ct; 3336 3337 tp = dev->si_tty; 3338 KASSERT(tp != NULL, 3339 ("ttysopen(): no tty pointer on device (%s)", devtoname(dev))); 3340 if (tp->t_state & TS_GONE) 3341 return (ENODEV); 3342 ct = dev->si_drv2; 3343 switch (cmd) { 3344 case TIOCSETA: 3345 error = priv_check(td, PRIV_TTY_SETA); 3346 if (error != 0) 3347 return (error); 3348 *ct = *(struct termios *)data; 3349 return (0); 3350 case TIOCGETA: 3351 *(struct termios *)data = *ct; 3352 return (0); 3353 case TIOCGETD: 3354 *(int *)data = TTYDISC; 3355 return (0); 3356 case TIOCGWINSZ: 3357 bzero(data, sizeof(struct winsize)); 3358 return (0); 3359 default: 3360 if (tp->t_cioctl != NULL) 3361 return(tp->t_cioctl(dev, cmd, data, flag, td)); 3362 return (ENOTTY); 3363 } 3364} 3365 3366/* 3367 * Initialize a tty to sane modes. 3368 */ 3369void 3370ttyinitmode(struct tty *tp, int echo, int speed) 3371{ 3372 3373 if (speed == 0) 3374 speed = TTYDEF_SPEED; 3375 tp->t_init_in.c_iflag = TTYDEF_IFLAG; 3376 tp->t_init_in.c_oflag = TTYDEF_OFLAG; 3377 tp->t_init_in.c_cflag = TTYDEF_CFLAG; 3378 if (echo) 3379 tp->t_init_in.c_lflag = TTYDEF_LFLAG_ECHO; 3380 else 3381 tp->t_init_in.c_lflag = TTYDEF_LFLAG_NOECHO; 3382 3383 tp->t_init_in.c_ispeed = tp->t_init_in.c_ospeed = speed; 3384 termioschars(&tp->t_init_in); 3385 tp->t_init_out = tp->t_init_in; 3386 tp->t_termios = tp->t_init_in; 3387} 3388 3389/* 3390 * Use more "normal" termios paramters for consoles. 3391 */ 3392void 3393ttyconsolemode(struct tty *tp, int speed) 3394{ 3395 3396 if (speed == 0) 3397 speed = TTYDEF_SPEED; 3398 ttyinitmode(tp, 1, speed); 3399 tp->t_init_in.c_cflag |= CLOCAL; 3400 tp->t_lock_out.c_cflag = tp->t_lock_in.c_cflag = CLOCAL; 3401 tp->t_lock_out.c_ispeed = tp->t_lock_out.c_ospeed = 3402 tp->t_lock_in.c_ispeed = tp->t_lock_in.c_ospeed = speed; 3403 tp->t_init_out = tp->t_init_in; 3404 tp->t_termios = tp->t_init_in; 3405 ttsetwater(tp); 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