tty.c revision 143438
1235783Skib/*- 2235783Skib * Copyright (c) 1982, 1986, 1990, 1991, 1993 3235783Skib * The Regents of the University of California. All rights reserved. 4235783Skib * (c) UNIX System Laboratories, Inc. 5235783Skib * All or some portions of this file are derived from material licensed 6235783Skib * to the University of California by American Telephone and Telegraph 7235783Skib * Co. or Unix System Laboratories, Inc. and are reproduced herein with 8235783Skib * the permission of UNIX System Laboratories, Inc. 9235783Skib * 10235783Skib * Copyright (c) 2002 Networks Associates Technologies, Inc. 11235783Skib * All rights reserved. 12235783Skib * 13235783Skib * Portions of this software were developed for the FreeBSD Project by 14235783Skib * ThinkSec AS and NAI Labs, the Security Research Division of Network 15235783Skib * Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 16235783Skib * ("CBOSS"), as part of the DARPA CHATS research program. 17235783Skib * 18235783Skib * Redistribution and use in source and binary forms, with or without 19235783Skib * modification, are permitted provided that the following conditions 20235783Skib * are met: 21235783Skib * 1. Redistributions of source code must retain the above copyright 22235783Skib * notice, this list of conditions and the following disclaimer. 23235783Skib * 2. Redistributions in binary form must reproduce the above copyright 24235783Skib * notice, this list of conditions and the following disclaimer in the 25235783Skib * documentation and/or other materials provided with the distribution. 26235783Skib * 4. Neither the name of the University nor the names of its contributors 27235783Skib * may be used to endorse or promote products derived from this software 28235783Skib * without specific prior written permission. 29235783Skib * 30235783Skib * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 31235783Skib * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 32235783Skib * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 33235783Skib * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 34235783Skib * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 35235783Skib * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 36235783Skib * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 37235783Skib * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 38235783Skib * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 39235783Skib * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 40235783Skib * SUCH DAMAGE. 41235783Skib * 42235783Skib * @(#)tty.c 8.8 (Berkeley) 1/21/94 43235783Skib */ 44235783Skib 45235783Skib/*- 46235783Skib * TODO: 47235783Skib * o Fix races for sending the start char in ttyflush(). 48235783Skib * o Handle inter-byte timeout for "MIN > 0, TIME > 0" in ttyselect(). 49235783Skib * With luck, there will be MIN chars before select() returns(). 50235783Skib * o Handle CLOCAL consistently for ptys. Perhaps disallow setting it. 51235783Skib * o Don't allow input in TS_ZOMBIE case. It would be visible through 52235783Skib * FIONREAD. 53235783Skib * o Do the new sio locking stuff here and use it to avoid special 54235783Skib * case for EXTPROC? 55235783Skib * o Lock PENDIN too? 56235783Skib * o Move EXTPROC and/or PENDIN to t_state? 57235783Skib * o Wrap most of ttioctl in spltty/splx. 58235783Skib * o Implement TIOCNOTTY or remove it from <sys/ioctl.h>. 59235783Skib * o Send STOP if IXOFF is toggled off while TS_TBLOCK is set. 60235783Skib * o Don't allow certain termios flags to affect disciplines other 61235783Skib * than TTYDISC. Cancel their effects before switch disciplines 62235783Skib * and ignore them if they are set while we are in another 63235783Skib * discipline. 64235783Skib * o Now that historical speed conversions are handled here, don't 65235783Skib * do them in drivers. 66235783Skib * o Check for TS_CARR_ON being set while everything is closed and not 67235783Skib * waiting for carrier. TS_CARR_ON isn't cleared if nothing is open, 68235783Skib * so it would live until the next open even if carrier drops. 69235783Skib * o Restore TS_WOPEN since it is useful in pstat. It must be cleared 70235783Skib * only when _all_ openers leave open(). 71235783Skib */ 72235783Skib 73235783Skib#include <sys/cdefs.h> 74235783Skib__FBSDID("$FreeBSD: head/sys/kern/tty.c 143438 2005-03-12 00:13:45Z peter $"); 75235783Skib 76235783Skib#include "opt_compat.h" 77235783Skib#include "opt_tty.h" 78235783Skib 79235783Skib#include <sys/param.h> 80235783Skib#include <sys/systm.h> 81235783Skib#include <sys/filio.h> 82235783Skib#include <sys/lock.h> 83235783Skib#include <sys/mutex.h> 84235783Skib#include <sys/namei.h> 85235783Skib#include <sys/sx.h> 86235783Skib#ifndef BURN_BRIDGES 87235783Skib#if defined(COMPAT_43) 88235783Skib#include <sys/ioctl_compat.h> 89235783Skib#endif 90235783Skib#endif 91235783Skib#include <sys/proc.h> 92235783Skib#define TTYDEFCHARS 93235783Skib#include <sys/tty.h> 94235783Skib#undef TTYDEFCHARS 95235783Skib#include <sys/fcntl.h> 96235783Skib#include <sys/conf.h> 97235783Skib#include <sys/poll.h> 98235783Skib#include <sys/kernel.h> 99235783Skib#include <sys/vnode.h> 100235783Skib#include <sys/serial.h> 101235783Skib#include <sys/signalvar.h> 102235783Skib#include <sys/resourcevar.h> 103235783Skib#include <sys/malloc.h> 104235783Skib#include <sys/filedesc.h> 105235783Skib#include <sys/sched.h> 106235783Skib#include <sys/sysctl.h> 107235783Skib#include <sys/timepps.h> 108235783Skib 109235783Skib#include <machine/stdarg.h> 110235783Skib 111235783Skib#include <vm/vm.h> 112235783Skib#include <vm/pmap.h> 113235783Skib#include <vm/vm_map.h> 114235783Skib 115235783SkibMALLOC_DEFINE(M_TTYS, "ttys", "tty data structures"); 116235783Skib 117235783Skiblong tk_cancc; 118235783Skiblong tk_nin; 119235783Skiblong tk_nout; 120235783Skiblong tk_rawcc; 121235783Skib 122235783Skibstatic d_open_t ttysopen; 123235783Skibstatic d_close_t ttysclose; 124235783Skibstatic d_read_t ttysrdwr; 125235783Skibstatic d_ioctl_t ttysioctl; 126235783Skibstatic d_purge_t ttypurge; 127235783Skib 128235783Skib/* Default cdevsw for common tty devices */ 129235783Skibstatic struct cdevsw tty_cdevsw = { 130235783Skib .d_version = D_VERSION, 131235783Skib .d_open = ttyopen, 132235783Skib .d_close = ttyclose, 133235783Skib .d_ioctl = ttyioctl, 134235783Skib .d_purge = ttypurge, 135235783Skib .d_name = "ttydrv", 136235783Skib .d_flags = D_TTY | D_NEEDGIANT, 137235783Skib}; 138235783Skib 139235783Skib/* Cdevsw for slave tty devices */ 140static struct cdevsw ttys_cdevsw = { 141 .d_version = D_VERSION, 142 .d_open = ttysopen, 143 .d_close = ttysclose, 144 .d_read = ttysrdwr, 145 .d_write = ttysrdwr, 146 .d_ioctl = ttysioctl, 147 .d_name = "TTYS", 148 .d_flags = D_TTY | D_NEEDGIANT, 149}; 150 151static int proc_compare(struct proc *p1, struct proc *p2); 152static int ttnread(struct tty *tp); 153static void ttyecho(int c, struct tty *tp); 154static int ttyoutput(int c, struct tty *tp); 155static void ttypend(struct tty *tp); 156static void ttyretype(struct tty *tp); 157static void ttyrub(int c, struct tty *tp); 158static void ttyrubo(struct tty *tp, int cnt); 159static void ttyunblock(struct tty *tp); 160static int ttywflush(struct tty *tp); 161static int filt_ttyread(struct knote *kn, long hint); 162static void filt_ttyrdetach(struct knote *kn); 163static int filt_ttywrite(struct knote *kn, long hint); 164static void filt_ttywdetach(struct knote *kn); 165 166/* 167 * Table with character classes and parity. The 8th bit indicates parity, 168 * the 7th bit indicates the character is an alphameric or underscore (for 169 * ALTWERASE), and the low 6 bits indicate delay type. If the low 6 bits 170 * are 0 then the character needs no special processing on output; classes 171 * other than 0 might be translated or (not currently) require delays. 172 */ 173#define E 0x00 /* Even parity. */ 174#define O 0x80 /* Odd parity. */ 175#define PARITY(c) (char_type[c] & O) 176 177#define ALPHA 0x40 /* Alpha or underscore. */ 178#define ISALPHA(c) (char_type[(c) & TTY_CHARMASK] & ALPHA) 179 180#define CCLASSMASK 0x3f 181#define CCLASS(c) (char_type[c] & CCLASSMASK) 182 183#define BS BACKSPACE 184#define CC CONTROL 185#define CR RETURN 186#define NA ORDINARY | ALPHA 187#define NL NEWLINE 188#define NO ORDINARY 189#define TB TAB 190#define VT VTAB 191 192static u_char const char_type[] = { 193 E|CC, O|CC, O|CC, E|CC, O|CC, E|CC, E|CC, O|CC, /* nul - bel */ 194 O|BS, E|TB, E|NL, O|CC, E|VT, O|CR, O|CC, E|CC, /* bs - si */ 195 O|CC, E|CC, E|CC, O|CC, E|CC, O|CC, O|CC, E|CC, /* dle - etb */ 196 E|CC, O|CC, O|CC, E|CC, O|CC, E|CC, E|CC, O|CC, /* can - us */ 197 O|NO, E|NO, E|NO, O|NO, E|NO, O|NO, O|NO, E|NO, /* sp - ' */ 198 E|NO, O|NO, O|NO, E|NO, O|NO, E|NO, E|NO, O|NO, /* ( - / */ 199 E|NA, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* 0 - 7 */ 200 O|NA, E|NA, E|NO, O|NO, E|NO, O|NO, O|NO, E|NO, /* 8 - ? */ 201 O|NO, E|NA, E|NA, O|NA, E|NA, O|NA, O|NA, E|NA, /* @ - G */ 202 E|NA, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* H - O */ 203 E|NA, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* P - W */ 204 O|NA, E|NA, E|NA, O|NO, E|NO, O|NO, O|NO, O|NA, /* X - _ */ 205 E|NO, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* ` - g */ 206 O|NA, E|NA, E|NA, O|NA, E|NA, O|NA, O|NA, E|NA, /* h - o */ 207 O|NA, E|NA, E|NA, O|NA, E|NA, O|NA, O|NA, E|NA, /* p - w */ 208 E|NA, O|NA, O|NA, E|NO, O|NO, E|NO, E|NO, O|CC, /* x - del */ 209 /* 210 * Meta chars; should be settable per character set; 211 * for now, treat them all as normal characters. 212 */ 213 NA, NA, NA, NA, NA, NA, NA, NA, 214 NA, NA, NA, NA, NA, NA, NA, NA, 215 NA, NA, NA, NA, NA, NA, NA, NA, 216 NA, NA, NA, NA, NA, NA, NA, NA, 217 NA, NA, NA, NA, NA, NA, NA, NA, 218 NA, NA, NA, NA, NA, NA, NA, NA, 219 NA, NA, NA, NA, NA, NA, NA, NA, 220 NA, NA, NA, NA, NA, NA, NA, NA, 221 NA, NA, NA, NA, NA, NA, NA, NA, 222 NA, NA, NA, NA, NA, NA, NA, NA, 223 NA, NA, NA, NA, NA, NA, NA, NA, 224 NA, NA, NA, NA, NA, NA, NA, NA, 225 NA, NA, NA, NA, NA, NA, NA, NA, 226 NA, NA, NA, NA, NA, NA, NA, NA, 227 NA, NA, NA, NA, NA, NA, NA, NA, 228 NA, NA, NA, NA, NA, NA, NA, NA, 229}; 230#undef BS 231#undef CC 232#undef CR 233#undef NA 234#undef NL 235#undef NO 236#undef TB 237#undef VT 238 239/* Macros to clear/set/test flags. */ 240#define SET(t, f) (t) |= (f) 241#define CLR(t, f) (t) &= ~(f) 242#define ISSET(t, f) ((t) & (f)) 243 244#undef MAX_INPUT /* XXX wrong in <sys/syslimits.h> */ 245#define MAX_INPUT TTYHOG /* XXX limit is usually larger for !ICANON */ 246 247/* 248 * list of struct tty where pstat(8) can pick it up with sysctl 249 * 250 * The lock order is to grab the list mutex before the tty mutex. 251 * Together with additions going on the tail of the list, this allows 252 * the sysctl to avoid doing retries. 253 */ 254static TAILQ_HEAD(, tty) tty_list = TAILQ_HEAD_INITIALIZER(tty_list); 255static struct mtx tty_list_mutex; 256 257static struct unrhdr *tty_unit; 258 259static int drainwait = 5*60; 260SYSCTL_INT(_kern, OID_AUTO, drainwait, CTLFLAG_RW, &drainwait, 261 0, "Output drain timeout in seconds"); 262 263static struct tty * 264tty_gettp(struct cdev *dev) 265{ 266 struct tty *tp; 267 struct cdevsw *csw; 268 269 csw = dev_refthread(dev); 270 KASSERT(csw != NULL, ("No cdevsw in ttycode (%s)", devtoname(dev))); 271 KASSERT(csw->d_flags & D_TTY, 272 ("non D_TTY (%s) in tty code", devtoname(dev))); 273 dev_relthread(dev); 274 tp = dev->si_tty; 275 KASSERT(tp != NULL, 276 ("no tty pointer on (%s) in tty code", devtoname(dev))); 277 return (tp); 278} 279 280/* 281 * Initial open of tty, or (re)entry to standard tty line discipline. 282 */ 283int 284tty_open(struct cdev *device, struct tty *tp) 285{ 286 int s; 287 288 s = spltty(); 289 tp->t_dev = device; 290 tp->t_hotchar = 0; 291 if (!ISSET(tp->t_state, TS_ISOPEN)) { 292 ttyref(tp); 293 SET(tp->t_state, TS_ISOPEN); 294 if (ISSET(tp->t_cflag, CLOCAL)) 295 SET(tp->t_state, TS_CONNECTED); 296 bzero(&tp->t_winsize, sizeof(tp->t_winsize)); 297 } 298 /* XXX don't hang forever on output */ 299 if (tp->t_timeout < 0) 300 tp->t_timeout = drainwait*hz; 301 ttsetwater(tp); 302 splx(s); 303 return (0); 304} 305 306/* 307 * Handle close() on a tty line: flush and set to initial state, 308 * bumping generation number so that pending read/write calls 309 * can detect recycling of the tty. 310 * XXX our caller should have done `spltty(); l_close(); tty_close();' 311 * and l_close() should have flushed, but we repeat the spltty() and 312 * the flush in case there are buggy callers. 313 */ 314int 315tty_close(struct tty *tp) 316{ 317 int s; 318 319 funsetown(&tp->t_sigio); 320 s = spltty(); 321 if (constty == tp) 322 constty_clear(); 323 324 ttyflush(tp, FREAD | FWRITE); 325 clist_free_cblocks(&tp->t_canq); 326 clist_free_cblocks(&tp->t_outq); 327 clist_free_cblocks(&tp->t_rawq); 328 329 tp->t_gen++; 330 tp->t_line = TTYDISC; 331 tp->t_hotchar = 0; 332 tp->t_pgrp = NULL; 333 tp->t_session = NULL; 334 tp->t_state = 0; 335 knlist_clear(&tp->t_rsel.si_note, 0); 336 knlist_clear(&tp->t_wsel.si_note, 0); 337 ttyrel(tp); 338 splx(s); 339 return (0); 340} 341 342#define FLUSHQ(q) { \ 343 if ((q)->c_cc) \ 344 ndflush(q, (q)->c_cc); \ 345} 346 347/* Is 'c' a line delimiter ("break" character)? */ 348#define TTBREAKC(c, lflag) \ 349 ((c) == '\n' || (((c) == cc[VEOF] || \ 350 (c) == cc[VEOL] || ((c) == cc[VEOL2] && lflag & IEXTEN)) && \ 351 (c) != _POSIX_VDISABLE)) 352 353/* 354 * Process input of a single character received on a tty. 355 */ 356int 357ttyinput(int c, struct tty *tp) 358{ 359 tcflag_t iflag, lflag; 360 cc_t *cc; 361 int i, err; 362 363 /* 364 * If input is pending take it first. 365 */ 366 lflag = tp->t_lflag; 367 if (ISSET(lflag, PENDIN)) 368 ttypend(tp); 369 /* 370 * Gather stats. 371 */ 372 if (ISSET(lflag, ICANON)) { 373 ++tk_cancc; 374 ++tp->t_cancc; 375 } else { 376 ++tk_rawcc; 377 ++tp->t_rawcc; 378 } 379 ++tk_nin; 380 381 /* 382 * Block further input iff: 383 * current input > threshold AND input is available to user program 384 * AND input flow control is enabled and not yet invoked. 385 * The 3 is slop for PARMRK. 386 */ 387 iflag = tp->t_iflag; 388 if (tp->t_rawq.c_cc + tp->t_canq.c_cc > tp->t_ihiwat - 3 && 389 (!ISSET(lflag, ICANON) || tp->t_canq.c_cc != 0) && 390 (ISSET(tp->t_cflag, CRTS_IFLOW) || ISSET(iflag, IXOFF)) && 391 !ISSET(tp->t_state, TS_TBLOCK)) 392 ttyblock(tp); 393 394 /* Handle exceptional conditions (break, parity, framing). */ 395 cc = tp->t_cc; 396 err = (ISSET(c, TTY_ERRORMASK)); 397 if (err) { 398 CLR(c, TTY_ERRORMASK); 399 if (ISSET(err, TTY_BI)) { 400 if (ISSET(iflag, IGNBRK)) 401 return (0); 402 if (ISSET(iflag, BRKINT)) { 403 ttyflush(tp, FREAD | FWRITE); 404 if (tp->t_pgrp != NULL) { 405 PGRP_LOCK(tp->t_pgrp); 406 pgsignal(tp->t_pgrp, SIGINT, 1); 407 PGRP_UNLOCK(tp->t_pgrp); 408 } 409 goto endcase; 410 } 411 if (ISSET(iflag, PARMRK)) 412 goto parmrk; 413 } else if ((ISSET(err, TTY_PE) && ISSET(iflag, INPCK)) 414 || ISSET(err, TTY_FE)) { 415 if (ISSET(iflag, IGNPAR)) 416 return (0); 417 else if (ISSET(iflag, PARMRK)) { 418parmrk: 419 if (tp->t_rawq.c_cc + tp->t_canq.c_cc > 420 MAX_INPUT - 3) 421 goto input_overflow; 422 (void)putc(0377 | TTY_QUOTE, &tp->t_rawq); 423 (void)putc(0 | TTY_QUOTE, &tp->t_rawq); 424 (void)putc(c | TTY_QUOTE, &tp->t_rawq); 425 goto endcase; 426 } else 427 c = 0; 428 } 429 } 430 431 if (!ISSET(tp->t_state, TS_TYPEN) && ISSET(iflag, ISTRIP)) 432 CLR(c, 0x80); 433 if (!ISSET(lflag, EXTPROC)) { 434 /* 435 * Check for literal nexting very first 436 */ 437 if (ISSET(tp->t_state, TS_LNCH)) { 438 SET(c, TTY_QUOTE); 439 CLR(tp->t_state, TS_LNCH); 440 } 441 /* 442 * Scan for special characters. This code 443 * is really just a big case statement with 444 * non-constant cases. The bottom of the 445 * case statement is labeled ``endcase'', so goto 446 * it after a case match, or similar. 447 */ 448 449 /* 450 * Control chars which aren't controlled 451 * by ICANON, ISIG, or IXON. 452 */ 453 if (ISSET(lflag, IEXTEN)) { 454 if (CCEQ(cc[VLNEXT], c)) { 455 if (ISSET(lflag, ECHO)) { 456 if (ISSET(lflag, ECHOE)) { 457 (void)ttyoutput('^', tp); 458 (void)ttyoutput('\b', tp); 459 } else 460 ttyecho(c, tp); 461 } 462 SET(tp->t_state, TS_LNCH); 463 goto endcase; 464 } 465 if (CCEQ(cc[VDISCARD], c)) { 466 if (ISSET(lflag, FLUSHO)) 467 CLR(tp->t_lflag, FLUSHO); 468 else { 469 ttyflush(tp, FWRITE); 470 ttyecho(c, tp); 471 if (tp->t_rawq.c_cc + tp->t_canq.c_cc) 472 ttyretype(tp); 473 SET(tp->t_lflag, FLUSHO); 474 } 475 goto startoutput; 476 } 477 } 478 /* 479 * Signals. 480 */ 481 if (ISSET(lflag, ISIG)) { 482 if (CCEQ(cc[VINTR], c) || CCEQ(cc[VQUIT], c)) { 483 if (!ISSET(lflag, NOFLSH)) 484 ttyflush(tp, FREAD | FWRITE); 485 ttyecho(c, tp); 486 if (tp->t_pgrp != NULL) { 487 PGRP_LOCK(tp->t_pgrp); 488 pgsignal(tp->t_pgrp, 489 CCEQ(cc[VINTR], c) ? SIGINT : SIGQUIT, 1); 490 PGRP_UNLOCK(tp->t_pgrp); 491 } 492 goto endcase; 493 } 494 if (CCEQ(cc[VSUSP], c)) { 495 if (!ISSET(lflag, NOFLSH)) 496 ttyflush(tp, FREAD); 497 ttyecho(c, tp); 498 if (tp->t_pgrp != NULL) { 499 PGRP_LOCK(tp->t_pgrp); 500 pgsignal(tp->t_pgrp, SIGTSTP, 1); 501 PGRP_UNLOCK(tp->t_pgrp); 502 } 503 goto endcase; 504 } 505 } 506 /* 507 * Handle start/stop characters. 508 */ 509 if (ISSET(iflag, IXON)) { 510 if (CCEQ(cc[VSTOP], c)) { 511 if (!ISSET(tp->t_state, TS_TTSTOP)) { 512 SET(tp->t_state, TS_TTSTOP); 513 (*tp->t_stop)(tp, 0); 514 return (0); 515 } 516 if (!CCEQ(cc[VSTART], c)) 517 return (0); 518 /* 519 * if VSTART == VSTOP then toggle 520 */ 521 goto endcase; 522 } 523 if (CCEQ(cc[VSTART], c)) 524 goto restartoutput; 525 } 526 /* 527 * IGNCR, ICRNL, & INLCR 528 */ 529 if (c == '\r') { 530 if (ISSET(iflag, IGNCR)) 531 return (0); 532 else if (ISSET(iflag, ICRNL)) 533 c = '\n'; 534 } else if (c == '\n' && ISSET(iflag, INLCR)) 535 c = '\r'; 536 } 537 if (!ISSET(tp->t_lflag, EXTPROC) && ISSET(lflag, ICANON)) { 538 /* 539 * From here on down canonical mode character 540 * processing takes place. 541 */ 542 /* 543 * erase or erase2 (^H / ^?) 544 */ 545 if (CCEQ(cc[VERASE], c) || CCEQ(cc[VERASE2], c) ) { 546 if (tp->t_rawq.c_cc) 547 ttyrub(unputc(&tp->t_rawq), tp); 548 goto endcase; 549 } 550 /* 551 * kill (^U) 552 */ 553 if (CCEQ(cc[VKILL], c)) { 554 if (ISSET(lflag, ECHOKE) && 555 tp->t_rawq.c_cc == tp->t_rocount && 556 !ISSET(lflag, ECHOPRT)) 557 while (tp->t_rawq.c_cc) 558 ttyrub(unputc(&tp->t_rawq), tp); 559 else { 560 ttyecho(c, tp); 561 if (ISSET(lflag, ECHOK) || 562 ISSET(lflag, ECHOKE)) 563 ttyecho('\n', tp); 564 FLUSHQ(&tp->t_rawq); 565 tp->t_rocount = 0; 566 } 567 CLR(tp->t_state, TS_LOCAL); 568 goto endcase; 569 } 570 /* 571 * word erase (^W) 572 */ 573 if (CCEQ(cc[VWERASE], c) && ISSET(lflag, IEXTEN)) { 574 int ctype; 575 576 /* 577 * erase whitespace 578 */ 579 while ((c = unputc(&tp->t_rawq)) == ' ' || c == '\t') 580 ttyrub(c, tp); 581 if (c == -1) 582 goto endcase; 583 /* 584 * erase last char of word and remember the 585 * next chars type (for ALTWERASE) 586 */ 587 ttyrub(c, tp); 588 c = unputc(&tp->t_rawq); 589 if (c == -1) 590 goto endcase; 591 if (c == ' ' || c == '\t') { 592 (void)putc(c, &tp->t_rawq); 593 goto endcase; 594 } 595 ctype = ISALPHA(c); 596 /* 597 * erase rest of word 598 */ 599 do { 600 ttyrub(c, tp); 601 c = unputc(&tp->t_rawq); 602 if (c == -1) 603 goto endcase; 604 } while (c != ' ' && c != '\t' && 605 (!ISSET(lflag, ALTWERASE) || ISALPHA(c) == ctype)); 606 (void)putc(c, &tp->t_rawq); 607 goto endcase; 608 } 609 /* 610 * reprint line (^R) 611 */ 612 if (CCEQ(cc[VREPRINT], c) && ISSET(lflag, IEXTEN)) { 613 ttyretype(tp); 614 goto endcase; 615 } 616 /* 617 * ^T - kernel info and generate SIGINFO 618 */ 619 if (CCEQ(cc[VSTATUS], c) && ISSET(lflag, IEXTEN)) { 620 if (ISSET(lflag, ISIG) && tp->t_pgrp != NULL) { 621 PGRP_LOCK(tp->t_pgrp); 622 pgsignal(tp->t_pgrp, SIGINFO, 1); 623 PGRP_UNLOCK(tp->t_pgrp); 624 } 625 if (!ISSET(lflag, NOKERNINFO)) 626 ttyinfo(tp); 627 goto endcase; 628 } 629 } 630 /* 631 * Check for input buffer overflow 632 */ 633 if (tp->t_rawq.c_cc + tp->t_canq.c_cc >= MAX_INPUT) { 634input_overflow: 635 if (ISSET(iflag, IMAXBEL)) { 636 if (tp->t_outq.c_cc < tp->t_ohiwat) 637 (void)ttyoutput(CTRL('g'), tp); 638 } 639 goto endcase; 640 } 641 642 if ( c == 0377 && ISSET(iflag, PARMRK) && !ISSET(iflag, ISTRIP) 643 && ISSET(iflag, IGNBRK|IGNPAR) != (IGNBRK|IGNPAR)) 644 (void)putc(0377 | TTY_QUOTE, &tp->t_rawq); 645 646 /* 647 * Put data char in q for user and 648 * wakeup on seeing a line delimiter. 649 */ 650 if (putc(c, &tp->t_rawq) >= 0) { 651 if (!ISSET(lflag, ICANON)) { 652 ttwakeup(tp); 653 ttyecho(c, tp); 654 goto endcase; 655 } 656 if (TTBREAKC(c, lflag)) { 657 tp->t_rocount = 0; 658 catq(&tp->t_rawq, &tp->t_canq); 659 ttwakeup(tp); 660 } else if (tp->t_rocount++ == 0) 661 tp->t_rocol = tp->t_column; 662 if (ISSET(tp->t_state, TS_ERASE)) { 663 /* 664 * end of prterase \.../ 665 */ 666 CLR(tp->t_state, TS_ERASE); 667 (void)ttyoutput('/', tp); 668 } 669 i = tp->t_column; 670 ttyecho(c, tp); 671 if (CCEQ(cc[VEOF], c) && ISSET(lflag, ECHO)) { 672 /* 673 * Place the cursor over the '^' of the ^D. 674 */ 675 i = imin(2, tp->t_column - i); 676 while (i > 0) { 677 (void)ttyoutput('\b', tp); 678 i--; 679 } 680 } 681 } 682endcase: 683 /* 684 * IXANY means allow any character to restart output. 685 */ 686 if (ISSET(tp->t_state, TS_TTSTOP) && 687 !ISSET(iflag, IXANY) && cc[VSTART] != cc[VSTOP]) 688 return (0); 689restartoutput: 690 CLR(tp->t_lflag, FLUSHO); 691 CLR(tp->t_state, TS_TTSTOP); 692startoutput: 693 return (ttstart(tp)); 694} 695 696/* 697 * Output a single character on a tty, doing output processing 698 * as needed (expanding tabs, newline processing, etc.). 699 * Returns < 0 if succeeds, otherwise returns char to resend. 700 * Must be recursive. 701 */ 702static int 703ttyoutput(int c, struct tty *tp) 704{ 705 tcflag_t oflag; 706 int col, s; 707 708 oflag = tp->t_oflag; 709 if (!ISSET(oflag, OPOST)) { 710 if (ISSET(tp->t_lflag, FLUSHO)) 711 return (-1); 712 if (putc(c, &tp->t_outq)) 713 return (c); 714 tk_nout++; 715 tp->t_outcc++; 716 return (-1); 717 } 718 /* 719 * Do tab expansion if OXTABS is set. Special case if we external 720 * processing, we don't do the tab expansion because we'll probably 721 * get it wrong. If tab expansion needs to be done, let it happen 722 * externally. 723 */ 724 CLR(c, ~TTY_CHARMASK); 725 if (c == '\t' && 726 ISSET(oflag, OXTABS) && !ISSET(tp->t_lflag, EXTPROC)) { 727 c = 8 - (tp->t_column & 7); 728 if (!ISSET(tp->t_lflag, FLUSHO)) { 729 s = spltty(); /* Don't interrupt tabs. */ 730 c -= b_to_q(" ", c, &tp->t_outq); 731 tk_nout += c; 732 tp->t_outcc += c; 733 splx(s); 734 } 735 tp->t_column += c; 736 return (c ? -1 : '\t'); 737 } 738 if (c == CEOT && ISSET(oflag, ONOEOT)) 739 return (-1); 740 741 /* 742 * Newline translation: if ONLCR is set, 743 * translate newline into "\r\n". 744 */ 745 if (c == '\n' && ISSET(tp->t_oflag, ONLCR)) { 746 tk_nout++; 747 tp->t_outcc++; 748 if (!ISSET(tp->t_lflag, FLUSHO) && putc('\r', &tp->t_outq)) 749 return (c); 750 } 751 /* If OCRNL is set, translate "\r" into "\n". */ 752 else if (c == '\r' && ISSET(tp->t_oflag, OCRNL)) 753 c = '\n'; 754 /* If ONOCR is set, don't transmit CRs when on column 0. */ 755 else if (c == '\r' && ISSET(tp->t_oflag, ONOCR) && tp->t_column == 0) 756 return (-1); 757 758 tk_nout++; 759 tp->t_outcc++; 760 if (!ISSET(tp->t_lflag, FLUSHO) && putc(c, &tp->t_outq)) 761 return (c); 762 763 col = tp->t_column; 764 switch (CCLASS(c)) { 765 case BACKSPACE: 766 if (col > 0) 767 --col; 768 break; 769 case CONTROL: 770 break; 771 case NEWLINE: 772 if (ISSET(tp->t_oflag, ONLCR | ONLRET)) 773 col = 0; 774 break; 775 case RETURN: 776 col = 0; 777 break; 778 case ORDINARY: 779 ++col; 780 break; 781 case TAB: 782 col = (col + 8) & ~7; 783 break; 784 } 785 tp->t_column = col; 786 return (-1); 787} 788 789/* 790 * Ioctls for all tty devices. Called after line-discipline specific ioctl 791 * has been called to do discipline-specific functions and/or reject any 792 * of these ioctl commands. 793 */ 794/* ARGSUSED */ 795int 796ttioctl(struct tty *tp, u_long cmd, void *data, int flag) 797{ 798 struct proc *p; 799 struct thread *td; 800 struct pgrp *pgrp; 801 int s, error, bits, sig, sig2; 802 803 td = curthread; /* XXX */ 804 p = td->td_proc; 805 806 /* If the ioctl involves modification, hang if in the background. */ 807 switch (cmd) { 808 case TIOCCBRK: 809 case TIOCCONS: 810 case TIOCDRAIN: 811 case TIOCEXCL: 812 case TIOCFLUSH: 813#ifdef TIOCHPCL 814 case TIOCHPCL: 815#endif 816 case TIOCNXCL: 817 case TIOCSBRK: 818 case TIOCSCTTY: 819 case TIOCSDRAINWAIT: 820 case TIOCSETA: 821 case TIOCSETAF: 822 case TIOCSETAW: 823 case TIOCSETD: 824 case TIOCSPGRP: 825 case TIOCSTART: 826 case TIOCSTAT: 827 case TIOCSTI: 828 case TIOCSTOP: 829 case TIOCSWINSZ: 830#ifndef BURN_BRIDGES 831#if defined(COMPAT_43) 832 case TIOCLBIC: 833 case TIOCLBIS: 834 case TIOCLSET: 835 case TIOCSETC: 836 case OTIOCSETD: 837 case TIOCSETN: 838 case TIOCSETP: 839 case TIOCSLTC: 840#endif 841#endif 842 sx_slock(&proctree_lock); 843 PROC_LOCK(p); 844 while (isbackground(p, tp) && !(p->p_flag & P_PPWAIT) && 845 !SIGISMEMBER(p->p_sigacts->ps_sigignore, SIGTTOU) && 846 !SIGISMEMBER(td->td_sigmask, SIGTTOU)) { 847 pgrp = p->p_pgrp; 848 PROC_UNLOCK(p); 849 if (pgrp->pg_jobc == 0) { 850 sx_sunlock(&proctree_lock); 851 return (EIO); 852 } 853 PGRP_LOCK(pgrp); 854 sx_sunlock(&proctree_lock); 855 pgsignal(pgrp, SIGTTOU, 1); 856 PGRP_UNLOCK(pgrp); 857 error = ttysleep(tp, &lbolt, TTOPRI | PCATCH, "ttybg1", 858 0); 859 if (error) 860 return (error); 861 sx_slock(&proctree_lock); 862 PROC_LOCK(p); 863 } 864 PROC_UNLOCK(p); 865 sx_sunlock(&proctree_lock); 866 break; 867 } 868 869 if (tp->t_break != NULL) { 870 switch (cmd) { 871 case TIOCSBRK: 872 tp->t_break(tp, 1); 873 return (0); 874 case TIOCCBRK: 875 tp->t_break(tp, 0); 876 return (0); 877 default: 878 break; 879 } 880 } 881 882 if (tp->t_modem != NULL) { 883 switch (cmd) { 884 case TIOCSDTR: 885 tp->t_modem(tp, SER_DTR, 0); 886 return (0); 887 case TIOCCDTR: 888 tp->t_modem(tp, 0, SER_DTR); 889 return (0); 890 case TIOCMSET: 891 bits = *(int *)data; 892 sig = (bits & (TIOCM_DTR | TIOCM_RTS)) >> 1; 893 sig2 = ((~bits) & (TIOCM_DTR | TIOCM_RTS)) >> 1; 894 tp->t_modem(tp, sig, sig2); 895 return (0); 896 case TIOCMBIS: 897 bits = *(int *)data; 898 sig = (bits & (TIOCM_DTR | TIOCM_RTS)) >> 1; 899 tp->t_modem(tp, sig, 0); 900 return (0); 901 case TIOCMBIC: 902 bits = *(int *)data; 903 sig = (bits & (TIOCM_DTR | TIOCM_RTS)) >> 1; 904 tp->t_modem(tp, 0, sig); 905 return (0); 906 case TIOCMGET: 907 sig = tp->t_modem(tp, 0, 0); 908 /* See <sys/serial.h. for the "<< 1" stuff */ 909 bits = TIOCM_LE + (sig << 1); 910 *(int *)data = bits; 911 return (0); 912 default: 913 break; 914 } 915 } 916 917 switch (cmd) { /* Process the ioctl. */ 918 case FIOASYNC: /* set/clear async i/o */ 919 s = spltty(); 920 if (*(int *)data) 921 SET(tp->t_state, TS_ASYNC); 922 else 923 CLR(tp->t_state, TS_ASYNC); 924 splx(s); 925 break; 926 case FIONBIO: /* set/clear non-blocking i/o */ 927 break; /* XXX: delete. */ 928 case FIONREAD: /* get # bytes to read */ 929 s = spltty(); 930 *(int *)data = ttnread(tp); 931 splx(s); 932 break; 933 934 case FIOSETOWN: 935 /* 936 * Policy -- Don't allow FIOSETOWN on someone else's 937 * controlling tty 938 */ 939 if (tp->t_session != NULL && !isctty(p, tp)) 940 return (ENOTTY); 941 942 error = fsetown(*(int *)data, &tp->t_sigio); 943 if (error) 944 return (error); 945 break; 946 case FIOGETOWN: 947 if (tp->t_session != NULL && !isctty(p, tp)) 948 return (ENOTTY); 949 *(int *)data = fgetown(&tp->t_sigio); 950 break; 951 952 case TIOCEXCL: /* set exclusive use of tty */ 953 s = spltty(); 954 SET(tp->t_state, TS_XCLUDE); 955 splx(s); 956 break; 957 case TIOCFLUSH: { /* flush buffers */ 958 int flags = *(int *)data; 959 960 if (flags == 0) 961 flags = FREAD | FWRITE; 962 else 963 flags &= FREAD | FWRITE; 964 ttyflush(tp, flags); 965 break; 966 } 967 case TIOCCONS: /* become virtual console */ 968 if (*(int *)data) { 969 struct nameidata nid; 970 971 if (constty && constty != tp && 972 ISSET(constty->t_state, TS_CONNECTED)) 973 return (EBUSY); 974 975 /* Ensure user can open the real console. */ 976 NDINIT(&nid, LOOKUP, LOCKLEAF | FOLLOW, UIO_SYSSPACE, 977 "/dev/console", td); 978 if ((error = namei(&nid)) != 0) 979 return (error); 980 NDFREE(&nid, NDF_ONLY_PNBUF); 981 error = VOP_ACCESS(nid.ni_vp, VREAD, td->td_ucred, td); 982 vput(nid.ni_vp); 983 if (error) 984 return (error); 985 986 constty_set(tp); 987 } else if (tp == constty) 988 constty_clear(); 989 break; 990 case TIOCDRAIN: /* wait till output drained */ 991 error = ttywait(tp); 992 if (error) 993 return (error); 994 break; 995 case TIOCGETA: { /* get termios struct */ 996 struct termios *t = (struct termios *)data; 997 998 bcopy(&tp->t_termios, t, sizeof(struct termios)); 999 break; 1000 } 1001 case TIOCGETD: /* get line discipline */ 1002 *(int *)data = tp->t_line; 1003 break; 1004 case TIOCGWINSZ: /* get window size */ 1005 *(struct winsize *)data = tp->t_winsize; 1006 break; 1007 case TIOCGPGRP: /* get pgrp of tty */ 1008 if (!isctty(p, tp)) 1009 return (ENOTTY); 1010 *(int *)data = tp->t_pgrp ? tp->t_pgrp->pg_id : NO_PID; 1011 break; 1012#ifdef TIOCHPCL 1013 case TIOCHPCL: /* hang up on last close */ 1014 s = spltty(); 1015 SET(tp->t_cflag, HUPCL); 1016 splx(s); 1017 break; 1018#endif 1019 case TIOCMGDTRWAIT: 1020 *(int *)data = tp->t_dtr_wait * 100 / hz; 1021 break; 1022 case TIOCMSDTRWAIT: 1023 /* must be root since the wait applies to following logins */ 1024 error = suser(td); 1025 if (error) 1026 return (error); 1027 tp->t_dtr_wait = *(int *)data * hz / 100; 1028 break; 1029 case TIOCNXCL: /* reset exclusive use of tty */ 1030 s = spltty(); 1031 CLR(tp->t_state, TS_XCLUDE); 1032 splx(s); 1033 break; 1034 case TIOCOUTQ: /* output queue size */ 1035 *(int *)data = tp->t_outq.c_cc; 1036 break; 1037 case TIOCSETA: /* set termios struct */ 1038 case TIOCSETAW: /* drain output, set */ 1039 case TIOCSETAF: { /* drn out, fls in, set */ 1040 struct termios *t = (struct termios *)data; 1041 1042 if (t->c_ispeed == 0) 1043 t->c_ispeed = t->c_ospeed; 1044 if (t->c_ispeed == 0) 1045 t->c_ispeed = tp->t_ospeed; 1046 if (t->c_ispeed == 0) 1047 return (EINVAL); 1048 s = spltty(); 1049 if (cmd == TIOCSETAW || cmd == TIOCSETAF) { 1050 error = ttywait(tp); 1051 if (error) { 1052 splx(s); 1053 return (error); 1054 } 1055 if (cmd == TIOCSETAF) 1056 ttyflush(tp, FREAD); 1057 } 1058 if (!ISSET(t->c_cflag, CIGNORE)) { 1059 /* 1060 * Set device hardware. 1061 */ 1062 if (tp->t_param && (error = (*tp->t_param)(tp, t))) { 1063 splx(s); 1064 return (error); 1065 } 1066 if (ISSET(t->c_cflag, CLOCAL) && 1067 !ISSET(tp->t_cflag, CLOCAL)) { 1068 /* 1069 * XXX disconnections would be too hard to 1070 * get rid of without this kludge. The only 1071 * way to get rid of controlling terminals 1072 * is to exit from the session leader. 1073 */ 1074 CLR(tp->t_state, TS_ZOMBIE); 1075 1076 wakeup(TSA_CARR_ON(tp)); 1077 ttwakeup(tp); 1078 ttwwakeup(tp); 1079 } 1080 if ((ISSET(tp->t_state, TS_CARR_ON) || 1081 ISSET(t->c_cflag, CLOCAL)) && 1082 !ISSET(tp->t_state, TS_ZOMBIE)) 1083 SET(tp->t_state, TS_CONNECTED); 1084 else 1085 CLR(tp->t_state, TS_CONNECTED); 1086 tp->t_cflag = t->c_cflag; 1087 tp->t_ispeed = t->c_ispeed; 1088 if (t->c_ospeed != 0) 1089 tp->t_ospeed = t->c_ospeed; 1090 ttsetwater(tp); 1091 } 1092 if (ISSET(t->c_lflag, ICANON) != ISSET(tp->t_lflag, ICANON) && 1093 cmd != TIOCSETAF) { 1094 if (ISSET(t->c_lflag, ICANON)) 1095 SET(tp->t_lflag, PENDIN); 1096 else { 1097 /* 1098 * XXX we really shouldn't allow toggling 1099 * ICANON while we're in a non-termios line 1100 * discipline. Now we have to worry about 1101 * panicing for a null queue. 1102 */ 1103 if (tp->t_canq.c_cbreserved > 0 && 1104 tp->t_rawq.c_cbreserved > 0) { 1105 catq(&tp->t_rawq, &tp->t_canq); 1106 /* 1107 * XXX the queue limits may be 1108 * different, so the old queue 1109 * swapping method no longer works. 1110 */ 1111 catq(&tp->t_canq, &tp->t_rawq); 1112 } 1113 CLR(tp->t_lflag, PENDIN); 1114 } 1115 ttwakeup(tp); 1116 } 1117 tp->t_iflag = t->c_iflag; 1118 tp->t_oflag = t->c_oflag; 1119 /* 1120 * Make the EXTPROC bit read only. 1121 */ 1122 if (ISSET(tp->t_lflag, EXTPROC)) 1123 SET(t->c_lflag, EXTPROC); 1124 else 1125 CLR(t->c_lflag, EXTPROC); 1126 tp->t_lflag = t->c_lflag | ISSET(tp->t_lflag, PENDIN); 1127 if (t->c_cc[VMIN] != tp->t_cc[VMIN] || 1128 t->c_cc[VTIME] != tp->t_cc[VTIME]) 1129 ttwakeup(tp); 1130 bcopy(t->c_cc, tp->t_cc, sizeof(t->c_cc)); 1131 splx(s); 1132 break; 1133 } 1134 case TIOCSETD: { /* set line discipline */ 1135 int t = *(int *)data; 1136 1137 if ((u_int)t >= nlinesw) 1138 return (ENXIO); 1139 if (t == tp->t_line) 1140 return (0); 1141 s = spltty(); 1142 ttyld_close(tp, flag); 1143 tp->t_line = t; 1144 /* XXX: we should use the correct cdev here */ 1145 error = ttyld_open(tp, tp->t_dev); 1146 if (error) { 1147 /* 1148 * If we fail to switch line discipline we cannot 1149 * fall back to the previous, because we can not 1150 * trust that ldisc to open successfully either. 1151 * Fall back to the default ldisc which we know 1152 * will allways succeed. 1153 */ 1154 tp->t_line = TTYDISC; 1155 (void)ttyld_open(tp, tp->t_dev); 1156 } 1157 splx(s); 1158 return (error); 1159 break; 1160 } 1161 case TIOCSTART: /* start output, like ^Q */ 1162 s = spltty(); 1163 if (ISSET(tp->t_state, TS_TTSTOP) || 1164 ISSET(tp->t_lflag, FLUSHO)) { 1165 CLR(tp->t_lflag, FLUSHO); 1166 CLR(tp->t_state, TS_TTSTOP); 1167 ttstart(tp); 1168 } 1169 splx(s); 1170 break; 1171 case TIOCSTI: /* simulate terminal input */ 1172 if ((flag & FREAD) == 0 && suser(td)) 1173 return (EPERM); 1174 if (!isctty(p, tp) && suser(td)) 1175 return (EACCES); 1176 s = spltty(); 1177 ttyld_rint(tp, *(u_char *)data); 1178 splx(s); 1179 break; 1180 case TIOCSTOP: /* stop output, like ^S */ 1181 s = spltty(); 1182 if (!ISSET(tp->t_state, TS_TTSTOP)) { 1183 SET(tp->t_state, TS_TTSTOP); 1184 (*tp->t_stop)(tp, 0); 1185 } 1186 splx(s); 1187 break; 1188 case TIOCSCTTY: /* become controlling tty */ 1189 /* Session ctty vnode pointer set in vnode layer. */ 1190 sx_slock(&proctree_lock); 1191 if (!SESS_LEADER(p) || 1192 ((p->p_session->s_ttyvp || tp->t_session) && 1193 (tp->t_session != p->p_session))) { 1194 sx_sunlock(&proctree_lock); 1195 return (EPERM); 1196 } 1197 tp->t_session = p->p_session; 1198 tp->t_pgrp = p->p_pgrp; 1199 SESS_LOCK(p->p_session); 1200 ttyref(tp); /* ttyrel(): kern_proc.c:pgdelete() */ 1201 p->p_session->s_ttyp = tp; 1202 SESS_UNLOCK(p->p_session); 1203 PROC_LOCK(p); 1204 p->p_flag |= P_CONTROLT; 1205 PROC_UNLOCK(p); 1206 sx_sunlock(&proctree_lock); 1207 break; 1208 case TIOCSPGRP: { /* set pgrp of tty */ 1209 sx_slock(&proctree_lock); 1210 pgrp = pgfind(*(int *)data); 1211 if (!isctty(p, tp)) { 1212 if (pgrp != NULL) 1213 PGRP_UNLOCK(pgrp); 1214 sx_sunlock(&proctree_lock); 1215 return (ENOTTY); 1216 } 1217 if (pgrp == NULL) { 1218 sx_sunlock(&proctree_lock); 1219 return (EPERM); 1220 } 1221 PGRP_UNLOCK(pgrp); 1222 if (pgrp->pg_session != p->p_session) { 1223 sx_sunlock(&proctree_lock); 1224 return (EPERM); 1225 } 1226 sx_sunlock(&proctree_lock); 1227 tp->t_pgrp = pgrp; 1228 break; 1229 } 1230 case TIOCSTAT: /* simulate control-T */ 1231 s = spltty(); 1232 ttyinfo(tp); 1233 splx(s); 1234 break; 1235 case TIOCSWINSZ: /* set window size */ 1236 if (bcmp((caddr_t)&tp->t_winsize, data, 1237 sizeof (struct winsize))) { 1238 tp->t_winsize = *(struct winsize *)data; 1239 if (tp->t_pgrp != NULL) { 1240 PGRP_LOCK(tp->t_pgrp); 1241 pgsignal(tp->t_pgrp, SIGWINCH, 1); 1242 PGRP_UNLOCK(tp->t_pgrp); 1243 } 1244 } 1245 break; 1246 case TIOCSDRAINWAIT: 1247 error = suser(td); 1248 if (error) 1249 return (error); 1250 tp->t_timeout = *(int *)data * hz; 1251 wakeup(TSA_OCOMPLETE(tp)); 1252 wakeup(TSA_OLOWAT(tp)); 1253 break; 1254 case TIOCGDRAINWAIT: 1255 *(int *)data = tp->t_timeout / hz; 1256 break; 1257 default: 1258#if defined(COMPAT_43) 1259#ifndef BURN_BRIDGES 1260 return (ttcompat(tp, cmd, data, flag)); 1261#else 1262 return (ENOIOCTL); 1263#endif 1264#else 1265 return (ENOIOCTL); 1266#endif 1267 } 1268 return (0); 1269} 1270 1271int 1272ttypoll(struct cdev *dev, int events, struct thread *td) 1273{ 1274 int s; 1275 int revents = 0; 1276 struct tty *tp; 1277 1278 tp = tty_gettp(dev); 1279 1280 if (tp == NULL) /* XXX used to return ENXIO, but that means true! */ 1281 return ((events & (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM)) 1282 | POLLHUP); 1283 1284 s = spltty(); 1285 if (events & (POLLIN | POLLRDNORM)) { 1286 if (ISSET(tp->t_state, TS_ZOMBIE)) 1287 revents |= (events & (POLLIN | POLLRDNORM)) | 1288 POLLHUP; 1289 else if (ttnread(tp) > 0) 1290 revents |= events & (POLLIN | POLLRDNORM); 1291 else 1292 selrecord(td, &tp->t_rsel); 1293 } 1294 if (events & POLLOUT) { 1295 if (ISSET(tp->t_state, TS_ZOMBIE)) 1296 revents |= POLLHUP; 1297 else if (tp->t_outq.c_cc <= tp->t_olowat && 1298 ISSET(tp->t_state, TS_CONNECTED)) 1299 revents |= events & POLLOUT; 1300 else 1301 selrecord(td, &tp->t_wsel); 1302 } 1303 splx(s); 1304 return (revents); 1305} 1306 1307static struct filterops ttyread_filtops = 1308 { 1, NULL, filt_ttyrdetach, filt_ttyread }; 1309static struct filterops ttywrite_filtops = 1310 { 1, NULL, filt_ttywdetach, filt_ttywrite }; 1311 1312int 1313ttykqfilter(struct cdev *dev, struct knote *kn) 1314{ 1315 struct tty *tp; 1316 struct knlist *klist; 1317 int s; 1318 1319 tp = tty_gettp(dev); 1320 1321 switch (kn->kn_filter) { 1322 case EVFILT_READ: 1323 klist = &tp->t_rsel.si_note; 1324 kn->kn_fop = &ttyread_filtops; 1325 break; 1326 case EVFILT_WRITE: 1327 klist = &tp->t_wsel.si_note; 1328 kn->kn_fop = &ttywrite_filtops; 1329 break; 1330 default: 1331 return (EINVAL); 1332 } 1333 1334 kn->kn_hook = (caddr_t)dev; 1335 1336 s = spltty(); 1337 knlist_add(klist, kn, 0); 1338 splx(s); 1339 1340 return (0); 1341} 1342 1343static void 1344filt_ttyrdetach(struct knote *kn) 1345{ 1346 struct tty *tp = ((struct cdev *)kn->kn_hook)->si_tty; 1347 int s = spltty(); 1348 1349 knlist_remove(&tp->t_rsel.si_note, kn, 0); 1350 splx(s); 1351} 1352 1353static int 1354filt_ttyread(struct knote *kn, long hint) 1355{ 1356 struct tty *tp = ((struct cdev *)kn->kn_hook)->si_tty; 1357 1358 kn->kn_data = ttnread(tp); 1359 if (ISSET(tp->t_state, TS_ZOMBIE)) { 1360 kn->kn_flags |= EV_EOF; 1361 return (1); 1362 } 1363 return (kn->kn_data > 0); 1364} 1365 1366static void 1367filt_ttywdetach(struct knote *kn) 1368{ 1369 struct tty *tp = ((struct cdev *)kn->kn_hook)->si_tty; 1370 int s = spltty(); 1371 1372 knlist_remove(&tp->t_wsel.si_note, kn, 0); 1373 splx(s); 1374} 1375 1376static int 1377filt_ttywrite(struct knote *kn, long hint) 1378{ 1379 struct tty *tp = ((struct cdev *)kn->kn_hook)->si_tty; 1380 1381 kn->kn_data = tp->t_outq.c_cc; 1382 if (ISSET(tp->t_state, TS_ZOMBIE)) 1383 return (1); 1384 return (kn->kn_data <= tp->t_olowat && 1385 ISSET(tp->t_state, TS_CONNECTED)); 1386} 1387 1388/* 1389 * Must be called at spltty(). 1390 */ 1391static int 1392ttnread(struct tty *tp) 1393{ 1394 int nread; 1395 1396 if (ISSET(tp->t_lflag, PENDIN)) 1397 ttypend(tp); 1398 nread = tp->t_canq.c_cc; 1399 if (!ISSET(tp->t_lflag, ICANON)) { 1400 nread += tp->t_rawq.c_cc; 1401 if (nread < tp->t_cc[VMIN] && tp->t_cc[VTIME] == 0) 1402 nread = 0; 1403 } 1404 return (nread); 1405} 1406 1407/* 1408 * Wait for output to drain. 1409 */ 1410int 1411ttywait(struct tty *tp) 1412{ 1413 int error, s; 1414 1415 error = 0; 1416 s = spltty(); 1417 while ((tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY)) && 1418 ISSET(tp->t_state, TS_CONNECTED) && tp->t_oproc) { 1419 (*tp->t_oproc)(tp); 1420 if ((tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY)) && 1421 ISSET(tp->t_state, TS_CONNECTED)) { 1422 SET(tp->t_state, TS_SO_OCOMPLETE); 1423 error = ttysleep(tp, TSA_OCOMPLETE(tp), 1424 TTOPRI | PCATCH, "ttywai", 1425 tp->t_timeout); 1426 if (error) { 1427 if (error == EWOULDBLOCK) 1428 error = EIO; 1429 break; 1430 } 1431 } else 1432 break; 1433 } 1434 if (!error && (tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY))) 1435 error = EIO; 1436 splx(s); 1437 return (error); 1438} 1439 1440/* 1441 * Flush if successfully wait. 1442 */ 1443static int 1444ttywflush(struct tty *tp) 1445{ 1446 int error; 1447 1448 if ((error = ttywait(tp)) == 0) 1449 ttyflush(tp, FREAD); 1450 return (error); 1451} 1452 1453/* 1454 * Flush tty read and/or write queues, notifying anyone waiting. 1455 */ 1456void 1457ttyflush(struct tty *tp, int rw) 1458{ 1459 int s; 1460 1461 s = spltty(); 1462#if 0 1463again: 1464#endif 1465 if (rw & FWRITE) { 1466 FLUSHQ(&tp->t_outq); 1467 CLR(tp->t_state, TS_TTSTOP); 1468 } 1469 (*tp->t_stop)(tp, rw); 1470 if (rw & FREAD) { 1471 FLUSHQ(&tp->t_canq); 1472 FLUSHQ(&tp->t_rawq); 1473 CLR(tp->t_lflag, PENDIN); 1474 tp->t_rocount = 0; 1475 tp->t_rocol = 0; 1476 CLR(tp->t_state, TS_LOCAL); 1477 ttwakeup(tp); 1478 if (ISSET(tp->t_state, TS_TBLOCK)) { 1479 if (rw & FWRITE) 1480 FLUSHQ(&tp->t_outq); 1481 ttyunblock(tp); 1482 1483 /* 1484 * Don't let leave any state that might clobber the 1485 * next line discipline (although we should do more 1486 * to send the START char). Not clearing the state 1487 * may have caused the "putc to a clist with no 1488 * reserved cblocks" panic/printf. 1489 */ 1490 CLR(tp->t_state, TS_TBLOCK); 1491 1492#if 0 /* forget it, sleeping isn't always safe and we don't know when it is */ 1493 if (ISSET(tp->t_iflag, IXOFF)) { 1494 /* 1495 * XXX wait a bit in the hope that the stop 1496 * character (if any) will go out. Waiting 1497 * isn't good since it allows races. This 1498 * will be fixed when the stop character is 1499 * put in a special queue. Don't bother with 1500 * the checks in ttywait() since the timeout 1501 * will save us. 1502 */ 1503 SET(tp->t_state, TS_SO_OCOMPLETE); 1504 ttysleep(tp, TSA_OCOMPLETE(tp), TTOPRI, 1505 "ttyfls", hz / 10); 1506 /* 1507 * Don't try sending the stop character again. 1508 */ 1509 CLR(tp->t_state, TS_TBLOCK); 1510 goto again; 1511 } 1512#endif 1513 } 1514 } 1515 if (rw & FWRITE) { 1516 FLUSHQ(&tp->t_outq); 1517 ttwwakeup(tp); 1518 } 1519 splx(s); 1520} 1521 1522/* 1523 * Copy in the default termios characters. 1524 */ 1525void 1526termioschars(struct termios *t) 1527{ 1528 1529 bcopy(ttydefchars, t->c_cc, sizeof t->c_cc); 1530} 1531 1532/* 1533 * Old interface. 1534 */ 1535void 1536ttychars(struct tty *tp) 1537{ 1538 1539 termioschars(&tp->t_termios); 1540} 1541 1542/* 1543 * Handle input high water. Send stop character for the IXOFF case. Turn 1544 * on our input flow control bit and propagate the changes to the driver. 1545 * XXX the stop character should be put in a special high priority queue. 1546 */ 1547void 1548ttyblock(struct tty *tp) 1549{ 1550 1551 SET(tp->t_state, TS_TBLOCK); 1552 if (ISSET(tp->t_iflag, IXOFF) && tp->t_cc[VSTOP] != _POSIX_VDISABLE && 1553 putc(tp->t_cc[VSTOP], &tp->t_outq) != 0) 1554 CLR(tp->t_state, TS_TBLOCK); /* try again later */ 1555 ttstart(tp); 1556} 1557 1558/* 1559 * Handle input low water. Send start character for the IXOFF case. Turn 1560 * off our input flow control bit and propagate the changes to the driver. 1561 * XXX the start character should be put in a special high priority queue. 1562 */ 1563static void 1564ttyunblock(struct tty *tp) 1565{ 1566 1567 CLR(tp->t_state, TS_TBLOCK); 1568 if (ISSET(tp->t_iflag, IXOFF) && tp->t_cc[VSTART] != _POSIX_VDISABLE && 1569 putc(tp->t_cc[VSTART], &tp->t_outq) != 0) 1570 SET(tp->t_state, TS_TBLOCK); /* try again later */ 1571 ttstart(tp); 1572} 1573 1574#ifdef notyet 1575/* Not used by any current (i386) drivers. */ 1576/* 1577 * Restart after an inter-char delay. 1578 */ 1579void 1580ttrstrt(void *tp_arg) 1581{ 1582 struct tty *tp; 1583 int s; 1584 1585 KASSERT(tp_arg != NULL, ("ttrstrt")); 1586 1587 tp = tp_arg; 1588 s = spltty(); 1589 1590 CLR(tp->t_state, TS_TIMEOUT); 1591 ttstart(tp); 1592 1593 splx(s); 1594} 1595#endif 1596 1597int 1598ttstart(struct tty *tp) 1599{ 1600 1601 if (tp->t_oproc != NULL) /* XXX: Kludge for pty. */ 1602 (*tp->t_oproc)(tp); 1603 return (0); 1604} 1605 1606/* 1607 * "close" a line discipline 1608 */ 1609int 1610ttylclose(struct tty *tp, int flag) 1611{ 1612 1613 if (flag & FNONBLOCK || ttywflush(tp)) 1614 ttyflush(tp, FREAD | FWRITE); 1615 return (0); 1616} 1617 1618/* 1619 * Handle modem control transition on a tty. 1620 * Flag indicates new state of carrier. 1621 * Returns 0 if the line should be turned off, otherwise 1. 1622 */ 1623int 1624ttymodem(struct tty *tp, int flag) 1625{ 1626 1627 if (ISSET(tp->t_state, TS_CARR_ON) && ISSET(tp->t_cflag, MDMBUF)) { 1628 /* 1629 * MDMBUF: do flow control according to carrier flag 1630 * XXX TS_CAR_OFLOW doesn't do anything yet. TS_TTSTOP 1631 * works if IXON and IXANY are clear. 1632 */ 1633 if (flag) { 1634 CLR(tp->t_state, TS_CAR_OFLOW); 1635 CLR(tp->t_state, TS_TTSTOP); 1636 ttstart(tp); 1637 } else if (!ISSET(tp->t_state, TS_CAR_OFLOW)) { 1638 SET(tp->t_state, TS_CAR_OFLOW); 1639 SET(tp->t_state, TS_TTSTOP); 1640 (*tp->t_stop)(tp, 0); 1641 } 1642 } else if (flag == 0) { 1643 /* 1644 * Lost carrier. 1645 */ 1646 CLR(tp->t_state, TS_CARR_ON); 1647 if (ISSET(tp->t_state, TS_ISOPEN) && 1648 !ISSET(tp->t_cflag, CLOCAL)) { 1649 SET(tp->t_state, TS_ZOMBIE); 1650 CLR(tp->t_state, TS_CONNECTED); 1651 if (tp->t_session) { 1652 sx_slock(&proctree_lock); 1653 if (tp->t_session->s_leader) { 1654 struct proc *p; 1655 1656 p = tp->t_session->s_leader; 1657 PROC_LOCK(p); 1658 psignal(p, SIGHUP); 1659 PROC_UNLOCK(p); 1660 } 1661 sx_sunlock(&proctree_lock); 1662 } 1663 ttyflush(tp, FREAD | FWRITE); 1664 return (0); 1665 } 1666 } else { 1667 /* 1668 * Carrier now on. 1669 */ 1670 SET(tp->t_state, TS_CARR_ON); 1671 if (!ISSET(tp->t_state, TS_ZOMBIE)) 1672 SET(tp->t_state, TS_CONNECTED); 1673 wakeup(TSA_CARR_ON(tp)); 1674 ttwakeup(tp); 1675 ttwwakeup(tp); 1676 } 1677 return (1); 1678} 1679 1680/* 1681 * Reinput pending characters after state switch 1682 * call at spltty(). 1683 */ 1684static void 1685ttypend(struct tty *tp) 1686{ 1687 struct clist tq; 1688 int c; 1689 1690 CLR(tp->t_lflag, PENDIN); 1691 SET(tp->t_state, TS_TYPEN); 1692 /* 1693 * XXX this assumes too much about clist internals. It may even 1694 * fail if the cblock slush pool is empty. We can't allocate more 1695 * cblocks here because we are called from an interrupt handler 1696 * and clist_alloc_cblocks() can wait. 1697 */ 1698 tq = tp->t_rawq; 1699 bzero(&tp->t_rawq, sizeof tp->t_rawq); 1700 tp->t_rawq.c_cbmax = tq.c_cbmax; 1701 tp->t_rawq.c_cbreserved = tq.c_cbreserved; 1702 while ((c = getc(&tq)) >= 0) 1703 ttyinput(c, tp); 1704 CLR(tp->t_state, TS_TYPEN); 1705} 1706 1707/* 1708 * Process a read call on a tty device. 1709 */ 1710int 1711ttread(struct tty *tp, struct uio *uio, int flag) 1712{ 1713 struct clist *qp; 1714 int c; 1715 tcflag_t lflag; 1716 cc_t *cc = tp->t_cc; 1717 struct thread *td; 1718 struct proc *p; 1719 int s, first, error = 0; 1720 int has_stime = 0, last_cc = 0; 1721 long slp = 0; /* XXX this should be renamed `timo'. */ 1722 struct timeval stime; 1723 struct pgrp *pg; 1724 1725 td = curthread; 1726 p = td->td_proc; 1727loop: 1728 s = spltty(); 1729 lflag = tp->t_lflag; 1730 /* 1731 * take pending input first 1732 */ 1733 if (ISSET(lflag, PENDIN)) { 1734 ttypend(tp); 1735 splx(s); /* reduce latency */ 1736 s = spltty(); 1737 lflag = tp->t_lflag; /* XXX ttypend() clobbers it */ 1738 } 1739 1740 /* 1741 * Hang process if it's in the background. 1742 */ 1743 if (isbackground(p, tp)) { 1744 splx(s); 1745 sx_slock(&proctree_lock); 1746 PROC_LOCK(p); 1747 if (SIGISMEMBER(p->p_sigacts->ps_sigignore, SIGTTIN) || 1748 SIGISMEMBER(td->td_sigmask, SIGTTIN) || 1749 (p->p_flag & P_PPWAIT) || p->p_pgrp->pg_jobc == 0) { 1750 PROC_UNLOCK(p); 1751 sx_sunlock(&proctree_lock); 1752 return (EIO); 1753 } 1754 pg = p->p_pgrp; 1755 PROC_UNLOCK(p); 1756 PGRP_LOCK(pg); 1757 sx_sunlock(&proctree_lock); 1758 pgsignal(pg, SIGTTIN, 1); 1759 PGRP_UNLOCK(pg); 1760 error = ttysleep(tp, &lbolt, TTIPRI | PCATCH, "ttybg2", 0); 1761 if (error) 1762 return (error); 1763 goto loop; 1764 } 1765 1766 if (ISSET(tp->t_state, TS_ZOMBIE)) { 1767 splx(s); 1768 return (0); /* EOF */ 1769 } 1770 1771 /* 1772 * If canonical, use the canonical queue, 1773 * else use the raw queue. 1774 * 1775 * (should get rid of clists...) 1776 */ 1777 qp = ISSET(lflag, ICANON) ? &tp->t_canq : &tp->t_rawq; 1778 1779 if (flag & IO_NDELAY) { 1780 if (qp->c_cc > 0) 1781 goto read; 1782 if (!ISSET(lflag, ICANON) && cc[VMIN] == 0) { 1783 splx(s); 1784 return (0); 1785 } 1786 splx(s); 1787 return (EWOULDBLOCK); 1788 } 1789 if (!ISSET(lflag, ICANON)) { 1790 int m = cc[VMIN]; 1791 long t = cc[VTIME]; 1792 struct timeval timecopy; 1793 1794 /* 1795 * Check each of the four combinations. 1796 * (m > 0 && t == 0) is the normal read case. 1797 * It should be fairly efficient, so we check that and its 1798 * companion case (m == 0 && t == 0) first. 1799 * For the other two cases, we compute the target sleep time 1800 * into slp. 1801 */ 1802 if (t == 0) { 1803 if (qp->c_cc < m) 1804 goto sleep; 1805 if (qp->c_cc > 0) 1806 goto read; 1807 1808 /* m, t and qp->c_cc are all 0. 0 is enough input. */ 1809 splx(s); 1810 return (0); 1811 } 1812 t *= 100000; /* time in us */ 1813#define diff(t1, t2) (((t1).tv_sec - (t2).tv_sec) * 1000000 + \ 1814 ((t1).tv_usec - (t2).tv_usec)) 1815 if (m > 0) { 1816 if (qp->c_cc <= 0) 1817 goto sleep; 1818 if (qp->c_cc >= m) 1819 goto read; 1820 getmicrotime(&timecopy); 1821 if (!has_stime) { 1822 /* first character, start timer */ 1823 has_stime = 1; 1824 stime = timecopy; 1825 slp = t; 1826 } else if (qp->c_cc > last_cc) { 1827 /* got a character, restart timer */ 1828 stime = timecopy; 1829 slp = t; 1830 } else { 1831 /* nothing, check expiration */ 1832 slp = t - diff(timecopy, stime); 1833 if (slp <= 0) 1834 goto read; 1835 } 1836 last_cc = qp->c_cc; 1837 } else { /* m == 0 */ 1838 if (qp->c_cc > 0) 1839 goto read; 1840 getmicrotime(&timecopy); 1841 if (!has_stime) { 1842 has_stime = 1; 1843 stime = timecopy; 1844 slp = t; 1845 } else { 1846 slp = t - diff(timecopy, stime); 1847 if (slp <= 0) { 1848 /* Timed out, but 0 is enough input. */ 1849 splx(s); 1850 return (0); 1851 } 1852 } 1853 } 1854#undef diff 1855 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 2537 if (ttycheckoutq(tp,0) == 0) 2538 return; 2539 2540 /* Print load average. */ 2541 load = (averunnable.ldavg[0] * 100 + FSCALE / 2) >> FSHIFT; 2542 ttyprintf(tp, "load: %d.%02d ", load / 100, load % 100); 2543 2544 /* 2545 * On return following a ttyprintf(), we set tp->t_rocount to 0 so 2546 * that pending input will be retyped on BS. 2547 */ 2548 if (tp->t_session == NULL) { 2549 ttyprintf(tp, "not a controlling terminal\n"); 2550 tp->t_rocount = 0; 2551 return; 2552 } 2553 if (tp->t_pgrp == NULL) { 2554 ttyprintf(tp, "no foreground process group\n"); 2555 tp->t_rocount = 0; 2556 return; 2557 } 2558 sx_slock(&proctree_lock); 2559 if ((p = LIST_FIRST(&tp->t_pgrp->pg_members)) == NULL) { 2560 sx_sunlock(&proctree_lock); 2561 ttyprintf(tp, "empty foreground process group\n"); 2562 tp->t_rocount = 0; 2563 return; 2564 } 2565 2566 /* 2567 * Pick the most interesting process and copy some of its 2568 * state for printing later. sched_lock must be held for 2569 * most parts of this. Holding it throughout is simplest 2570 * and prevents even unimportant inconsistencies in the 2571 * copy of the state, but may increase interrupt latency 2572 * too much. 2573 */ 2574 mtx_lock_spin(&sched_lock); 2575 for (pick = NULL; p != NULL; p = LIST_NEXT(p, p_pglist)) 2576 if (proc_compare(pick, p)) 2577 pick = p; 2578 2579 td = FIRST_THREAD_IN_PROC(pick); /* XXXKSE */ 2580#if 0 2581 KASSERT(td != NULL, ("ttyinfo: no thread")); 2582#else 2583 if (td == NULL) { 2584 mtx_unlock_spin(&sched_lock); 2585 sx_sunlock(&proctree_lock); 2586 ttyprintf(tp, "foreground process without thread\n"); 2587 tp->t_rocount = 0; 2588 return; 2589 } 2590#endif 2591 stateprefix = ""; 2592 if (TD_IS_RUNNING(td)) 2593 state = "running"; 2594 else if (TD_ON_RUNQ(td) || TD_CAN_RUN(td)) 2595 state = "runnable"; 2596 else if (TD_IS_SLEEPING(td)) { 2597 /* XXX: If we're sleeping, are we ever not in a queue? */ 2598 if (TD_ON_SLEEPQ(td)) 2599 state = td->td_wmesg; 2600 else 2601 state = "sleeping without queue"; 2602 } else if (TD_ON_LOCK(td)) { 2603 state = td->td_lockname; 2604 stateprefix = "*"; 2605 } else if (TD_IS_SUSPENDED(td)) 2606 state = "suspended"; 2607 else if (TD_AWAITING_INTR(td)) 2608 state = "intrwait"; 2609 else 2610 state = "unknown"; 2611 pctcpu = (sched_pctcpu(td) * 10000 + FSCALE / 2) >> FSHIFT; 2612 if (pick->p_state == PRS_NEW || pick->p_state == PRS_ZOMBIE) 2613 rss = 0; 2614 else 2615 rss = pgtok(vmspace_resident_count(pick->p_vmspace)); 2616 mtx_unlock_spin(&sched_lock); 2617 PROC_LOCK(pick); 2618 calcru(pick, &utime, &stime); 2619 PROC_UNLOCK(pick); 2620 2621 /* Print command, pid, state, utime, stime, %cpu, and rss. */ 2622 ttyprintf(tp, 2623 " cmd: %s %d [%s%s] %ld.%02ldu %ld.%02lds %d%% %ldk\n", 2624 pick->p_comm, pick->p_pid, stateprefix, state, 2625 (long)utime.tv_sec, utime.tv_usec / 10000, 2626 (long)stime.tv_sec, stime.tv_usec / 10000, 2627 pctcpu / 100, rss); 2628 tp->t_rocount = 0; 2629 sx_sunlock(&proctree_lock); 2630} 2631 2632/* 2633 * Returns 1 if p2 is "better" than p1 2634 * 2635 * The algorithm for picking the "interesting" process is thus: 2636 * 2637 * 1) Only foreground processes are eligible - implied. 2638 * 2) Runnable processes are favored over anything else. The runner 2639 * with the highest cpu utilization is picked (p_estcpu). Ties are 2640 * broken by picking the highest pid. 2641 * 3) The sleeper with the shortest sleep time is next. With ties, 2642 * we pick out just "short-term" sleepers (P_SINTR == 0). 2643 * 4) Further ties are broken by picking the highest pid. 2644 */ 2645#define ISRUN(p, val) \ 2646do { \ 2647 struct thread *td; \ 2648 val = 0; \ 2649 FOREACH_THREAD_IN_PROC(p, td) { \ 2650 if (TD_ON_RUNQ(td) || \ 2651 TD_IS_RUNNING(td)) { \ 2652 val = 1; \ 2653 break; \ 2654 } \ 2655 } \ 2656} while (0) 2657 2658#define TESTAB(a, b) ((a)<<1 | (b)) 2659#define ONLYA 2 2660#define ONLYB 1 2661#define BOTH 3 2662 2663static int 2664proc_compare(struct proc *p1, struct proc *p2) 2665{ 2666 2667 int esta, estb; 2668 struct ksegrp *kg; 2669 mtx_assert(&sched_lock, MA_OWNED); 2670 if (p1 == NULL) 2671 return (1); 2672 2673 ISRUN(p1, esta); 2674 ISRUN(p2, estb); 2675 2676 /* 2677 * see if at least one of them is runnable 2678 */ 2679 switch (TESTAB(esta, estb)) { 2680 case ONLYA: 2681 return (0); 2682 case ONLYB: 2683 return (1); 2684 case BOTH: 2685 /* 2686 * tie - favor one with highest recent cpu utilization 2687 */ 2688 esta = estb = 0; 2689 FOREACH_KSEGRP_IN_PROC(p1,kg) { 2690 esta += kg->kg_estcpu; 2691 } 2692 FOREACH_KSEGRP_IN_PROC(p2,kg) { 2693 estb += kg->kg_estcpu; 2694 } 2695 if (estb > esta) 2696 return (1); 2697 if (esta > estb) 2698 return (0); 2699 return (p2->p_pid > p1->p_pid); /* tie - return highest pid */ 2700 } 2701 /* 2702 * weed out zombies 2703 */ 2704 switch (TESTAB(p1->p_state == PRS_ZOMBIE, p2->p_state == PRS_ZOMBIE)) { 2705 case ONLYA: 2706 return (1); 2707 case ONLYB: 2708 return (0); 2709 case BOTH: 2710 return (p2->p_pid > p1->p_pid); /* tie - return highest pid */ 2711 } 2712 2713#if 0 /* XXXKSE */ 2714 /* 2715 * pick the one with the smallest sleep time 2716 */ 2717 if (p2->p_slptime > p1->p_slptime) 2718 return (0); 2719 if (p1->p_slptime > p2->p_slptime) 2720 return (1); 2721 /* 2722 * favor one sleeping in a non-interruptible sleep 2723 */ 2724 if (p1->p_sflag & PS_SINTR && (p2->p_sflag & PS_SINTR) == 0) 2725 return (1); 2726 if (p2->p_sflag & PS_SINTR && (p1->p_sflag & PS_SINTR) == 0) 2727 return (0); 2728#endif 2729 return (p2->p_pid > p1->p_pid); /* tie - return highest pid */ 2730} 2731 2732/* 2733 * Output char to tty; console putchar style. 2734 */ 2735int 2736tputchar(int c, struct tty *tp) 2737{ 2738 int s; 2739 2740 s = spltty(); 2741 if (!ISSET(tp->t_state, TS_CONNECTED)) { 2742 splx(s); 2743 return (-1); 2744 } 2745 if (c == '\n') 2746 (void)ttyoutput('\r', tp); 2747 (void)ttyoutput(c, tp); 2748 ttstart(tp); 2749 splx(s); 2750 return (0); 2751} 2752 2753/* 2754 * Sleep on chan, returning ERESTART if tty changed while we napped and 2755 * returning any errors (e.g. EINTR/EWOULDBLOCK) reported by tsleep. If 2756 * the tty is revoked, restarting a pending call will redo validation done 2757 * at the start of the call. 2758 */ 2759int 2760ttysleep(struct tty *tp, void *chan, int pri, char *wmesg, int timo) 2761{ 2762 int error; 2763 int gen; 2764 2765 gen = tp->t_gen; 2766 error = tsleep(chan, pri, wmesg, timo); 2767 if (tp->t_state & TS_GONE) 2768 return (ENXIO); 2769 if (error) 2770 return (error); 2771 return (tp->t_gen == gen ? 0 : ERESTART); 2772} 2773 2774/* 2775 * Gain a reference to a TTY 2776 */ 2777int 2778ttyref(struct tty *tp) 2779{ 2780 int i; 2781 2782 mtx_lock(&tp->t_mtx); 2783 KASSERT(tp->t_refcnt > 0, 2784 ("ttyref(): tty refcnt is %d (%s)", 2785 tp->t_refcnt, tp->t_dev != NULL ? devtoname(tp->t_dev) : "??")); 2786 i = ++tp->t_refcnt; 2787 mtx_unlock(&tp->t_mtx); 2788 return (i); 2789} 2790 2791/* 2792 * Drop a reference to a TTY. 2793 * When reference count drops to zero, we free it. 2794 */ 2795int 2796ttyrel(struct tty *tp) 2797{ 2798 int i; 2799 2800 mtx_lock(&tty_list_mutex); 2801 mtx_lock(&tp->t_mtx); 2802 KASSERT(tp->t_refcnt > 0, 2803 ("ttyrel(): tty refcnt is %d (%s)", 2804 tp->t_refcnt, tp->t_dev != NULL ? devtoname(tp->t_dev) : "??")); 2805 i = --tp->t_refcnt; 2806 if (i != 0) { 2807 mtx_unlock(&tp->t_mtx); 2808 mtx_unlock(&tty_list_mutex); 2809 return (i); 2810 } 2811 TAILQ_REMOVE(&tty_list, tp, t_list); 2812 mtx_unlock(&tp->t_mtx); 2813 mtx_unlock(&tty_list_mutex); 2814 knlist_destroy(&tp->t_rsel.si_note); 2815 knlist_destroy(&tp->t_wsel.si_note); 2816 mtx_destroy(&tp->t_mtx); 2817 free(tp, M_TTYS); 2818 return (i); 2819} 2820 2821/* 2822 * Allocate a tty struct. Clists in the struct will be allocated by 2823 * tty_open(). 2824 */ 2825struct tty * 2826ttymalloc(struct tty *tp) 2827{ 2828 static int once; 2829 2830 if (!once) { 2831 mtx_init(&tty_list_mutex, "ttylist", NULL, MTX_DEF); 2832 once++; 2833 } 2834 2835 if (tp) { 2836 /* 2837 * XXX: Either this argument should go away, or we should 2838 * XXX: require it and do a ttyrel(tp) here and allocate 2839 * XXX: a new tty. For now do nothing. 2840 */ 2841 return(tp); 2842 } 2843 tp = malloc(sizeof *tp, M_TTYS, M_WAITOK | M_ZERO); 2844 mtx_init(&tp->t_mtx, "tty", NULL, MTX_DEF); 2845 2846 /* 2847 * Set up the initial state 2848 */ 2849 tp->t_refcnt = 1; 2850 tp->t_timeout = -1; 2851 tp->t_dtr_wait = 3 * hz; 2852 2853 ttyinitmode(tp, 0, 0); 2854 bcopy(ttydefchars, tp->t_init_in.c_cc, sizeof tp->t_init_in.c_cc); 2855 2856 /* Make callout the same as callin */ 2857 tp->t_init_out = tp->t_init_in; 2858 2859 mtx_lock(&tty_list_mutex); 2860 TAILQ_INSERT_TAIL(&tty_list, tp, t_list); 2861 mtx_unlock(&tty_list_mutex); 2862 knlist_init(&tp->t_rsel.si_note, &tp->t_mtx); 2863 knlist_init(&tp->t_wsel.si_note, &tp->t_mtx); 2864 return (tp); 2865} 2866 2867struct tty * 2868ttyalloc() 2869{ 2870 2871 return (ttymalloc(NULL)); 2872} 2873 2874static void 2875ttypurge(struct cdev *dev) 2876{ 2877 2878 if (dev->si_tty == NULL) 2879 return; 2880 ttygone(dev->si_tty); 2881} 2882 2883/* 2884 * ttycreate() 2885 * 2886 * Create the device entries for this tty thereby opening it for business. 2887 * 2888 * The flags argument controls if "cua" units are created. 2889 * 2890 * The t_sc filed is copied to si_drv1 in the created cdevs. This 2891 * is particularly important for ->t_cioctl() users. 2892 * 2893 * XXX: implement the init and lock devices by cloning. 2894 */ 2895 2896int 2897ttycreate(struct tty *tp, struct cdevsw *csw, int unit, int flags, const char *fmt, ...) 2898{ 2899 char namebuf[SPECNAMELEN - 3]; /* XXX space for "tty" */ 2900 va_list ap; 2901 struct cdev *cp; 2902 int i, minor, sminor, sunit; 2903 2904 mtx_assert(&Giant, MA_OWNED); 2905 2906 if (tty_unit == NULL) 2907 tty_unit = new_unrhdr(0, 0xffff, NULL); 2908 2909 sunit = alloc_unr(tty_unit); 2910 tp->t_devunit = sunit; 2911 2912 if (csw == NULL) { 2913 csw = &tty_cdevsw; 2914 unit = sunit; 2915 } 2916 KASSERT(csw->d_purge == NULL || csw->d_purge == ttypurge, 2917 ("tty should not have d_purge")); 2918 2919 csw->d_purge = ttypurge; 2920 2921 minor = unit2minor(unit); 2922 sminor = unit2minor(sunit); 2923 va_start(ap, fmt); 2924 i = vsnrprintf(namebuf, sizeof namebuf, 32, fmt, ap); 2925 va_end(ap); 2926 KASSERT(i < sizeof namebuf, ("Too long tty name (%s)", namebuf)); 2927 2928 cp = make_dev(csw, minor, 2929 UID_ROOT, GID_WHEEL, 0600, "tty%s", namebuf); 2930 tp->t_dev = cp; 2931 tp->t_mdev = cp; 2932 cp->si_tty = tp; 2933 cp->si_drv1 = tp->t_sc; 2934 2935 cp = make_dev(&ttys_cdevsw, sminor | MINOR_INIT, 2936 UID_ROOT, GID_WHEEL, 0600, "tty%s.init", namebuf); 2937 dev_depends(tp->t_dev, cp); 2938 cp->si_drv1 = tp->t_sc; 2939 cp->si_drv2 = &tp->t_init_in; 2940 cp->si_tty = tp; 2941 2942 cp = make_dev(&ttys_cdevsw, sminor | MINOR_LOCK, 2943 UID_ROOT, GID_WHEEL, 0600, "tty%s.lock", namebuf); 2944 dev_depends(tp->t_dev, cp); 2945 cp->si_drv1 = tp->t_sc; 2946 cp->si_drv2 = &tp->t_lock_in; 2947 cp->si_tty = tp; 2948 2949 if (flags & MINOR_CALLOUT) { 2950 cp = make_dev(csw, minor | MINOR_CALLOUT, 2951 UID_UUCP, GID_DIALER, 0660, "cua%s", namebuf); 2952 dev_depends(tp->t_dev, cp); 2953 cp->si_drv1 = tp->t_sc; 2954 cp->si_tty = tp; 2955 2956 cp = make_dev(&ttys_cdevsw, sminor | MINOR_CALLOUT | MINOR_INIT, 2957 UID_UUCP, GID_DIALER, 0660, "cua%s.init", namebuf); 2958 dev_depends(tp->t_dev, cp); 2959 cp->si_drv1 = tp->t_sc; 2960 cp->si_drv2 = &tp->t_init_out; 2961 cp->si_tty = tp; 2962 2963 cp = make_dev(&ttys_cdevsw, sminor | MINOR_CALLOUT | MINOR_LOCK, 2964 UID_UUCP, GID_DIALER, 0660, "cua%s.lock", namebuf); 2965 dev_depends(tp->t_dev, cp); 2966 cp->si_drv1 = tp->t_sc; 2967 cp->si_drv2 = &tp->t_lock_out; 2968 cp->si_tty = tp; 2969 } 2970 2971 return (0); 2972} 2973 2974/* 2975 * This function is called when the hardware disappears. We set a flag 2976 * and wake up stuff so all sleeping threads will notice. 2977 */ 2978void 2979ttygone(struct tty *tp) 2980{ 2981 2982 tp->t_state |= TS_GONE; 2983 wakeup(&tp->t_dtr_wait); 2984 wakeup(TSA_CARR_ON(tp)); 2985 wakeup(TSA_HUP_OR_INPUT(tp)); 2986 wakeup(TSA_OCOMPLETE(tp)); 2987 wakeup(TSA_OLOWAT(tp)); 2988 if (tp->t_purge != NULL) 2989 tp->t_purge(tp); 2990} 2991 2992/* 2993 * ttyfree() 2994 * 2995 * Called when the driver is ready to free the tty structure. 2996 * 2997 * XXX: This shall sleep until all threads have left the driver. 2998 */ 2999 3000void 3001ttyfree(struct tty *tp) 3002{ 3003 u_int unit; 3004 3005 mtx_assert(&Giant, MA_OWNED); 3006 ttygone(tp); 3007 unit = tp->t_devunit; 3008 destroy_dev(tp->t_mdev); 3009 free_unr(tty_unit, unit); 3010} 3011 3012static int 3013sysctl_kern_ttys(SYSCTL_HANDLER_ARGS) 3014{ 3015 struct tty *tp, *tp2; 3016 struct xtty xt; 3017 int error; 3018 3019 error = 0; 3020 mtx_lock(&tty_list_mutex); 3021 tp = TAILQ_FIRST(&tty_list); 3022 if (tp != NULL) 3023 ttyref(tp); 3024 mtx_unlock(&tty_list_mutex); 3025 while (tp != NULL) { 3026 bzero(&xt, sizeof xt); 3027 xt.xt_size = sizeof xt; 3028#define XT_COPY(field) xt.xt_##field = tp->t_##field 3029 xt.xt_rawcc = tp->t_rawq.c_cc; 3030 xt.xt_cancc = tp->t_canq.c_cc; 3031 xt.xt_outcc = tp->t_outq.c_cc; 3032 XT_COPY(line); 3033 if (tp->t_dev != NULL) 3034 xt.xt_dev = dev2udev(tp->t_dev); 3035 XT_COPY(state); 3036 XT_COPY(flags); 3037 XT_COPY(timeout); 3038 if (tp->t_pgrp != NULL) 3039 xt.xt_pgid = tp->t_pgrp->pg_id; 3040 if (tp->t_session != NULL) 3041 xt.xt_sid = tp->t_session->s_sid; 3042 XT_COPY(termios); 3043 XT_COPY(winsize); 3044 XT_COPY(column); 3045 XT_COPY(rocount); 3046 XT_COPY(rocol); 3047 XT_COPY(ififosize); 3048 XT_COPY(ihiwat); 3049 XT_COPY(ilowat); 3050 XT_COPY(ispeedwat); 3051 XT_COPY(ohiwat); 3052 XT_COPY(olowat); 3053 XT_COPY(ospeedwat); 3054#undef XT_COPY 3055 error = SYSCTL_OUT(req, &xt, sizeof xt); 3056 if (error != 0) { 3057 ttyrel(tp); 3058 return (error); 3059 } 3060 mtx_lock(&tty_list_mutex); 3061 tp2 = TAILQ_NEXT(tp, t_list); 3062 if (tp2 != NULL) 3063 ttyref(tp2); 3064 mtx_unlock(&tty_list_mutex); 3065 ttyrel(tp); 3066 tp = tp2; 3067 } 3068 return (0); 3069} 3070 3071SYSCTL_PROC(_kern, OID_AUTO, ttys, CTLTYPE_OPAQUE|CTLFLAG_RD, 3072 0, 0, sysctl_kern_ttys, "S,xtty", "All ttys"); 3073SYSCTL_LONG(_kern, OID_AUTO, tty_nin, CTLFLAG_RD, 3074 &tk_nin, 0, "Total TTY in characters"); 3075SYSCTL_LONG(_kern, OID_AUTO, tty_nout, CTLFLAG_RD, 3076 &tk_nout, 0, "Total TTY out characters"); 3077 3078void 3079nottystop(struct tty *tp, int rw) 3080{ 3081 3082 return; 3083} 3084 3085int 3086ttyopen(struct cdev *dev, int flag, int mode, struct thread *td) 3087{ 3088 int error; 3089 int s; 3090 struct tty *tp; 3091 3092 tp = dev->si_tty; 3093 s = spltty(); 3094 /* 3095 * We jump to this label after all non-interrupted sleeps to pick 3096 * up any changes of the device state. 3097 */ 3098open_top: 3099 if (tp->t_state & TS_GONE) 3100 return (ENXIO); 3101 error = ttydtrwaitsleep(tp); 3102 if (error) 3103 goto out; 3104 if (tp->t_state & TS_ISOPEN) { 3105 /* 3106 * The device is open, so everything has been initialized. 3107 * Handle conflicts. 3108 */ 3109 if (ISCALLOUT(dev) && !tp->t_actout) 3110 return (EBUSY); 3111 if (tp->t_actout && !ISCALLOUT(dev)) { 3112 if (flag & O_NONBLOCK) 3113 return (EBUSY); 3114 error = tsleep(&tp->t_actout, 3115 TTIPRI | PCATCH, "ttybi", 0); 3116 if (error != 0 || (tp->t_flags & TS_GONE)) 3117 goto out; 3118 goto open_top; 3119 } 3120 if (tp->t_state & TS_XCLUDE && suser(td)) 3121 return (EBUSY); 3122 } else { 3123 /* 3124 * The device isn't open, so there are no conflicts. 3125 * Initialize it. Initialization is done twice in many 3126 * cases: to preempt sleeping callin opens if we are 3127 * callout, and to complete a callin open after DCD rises. 3128 */ 3129 tp->t_termios = ISCALLOUT(dev) ? tp->t_init_out : tp->t_init_in; 3130 tp->t_cflag = tp->t_termios.c_cflag; 3131 tp->t_modem(tp, SER_DTR | SER_RTS, 0); 3132 ++tp->t_wopeners; 3133 error = tp->t_param(tp, &tp->t_termios); 3134 --tp->t_wopeners; 3135 if (error == 0 && tp->t_open != NULL) 3136 error = tp->t_open(tp, dev); 3137 if (error != 0) 3138 goto out; 3139 if (ISCALLOUT(dev) || (tp->t_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 tp->t_close != NULL) 3162 tp->t_close(tp); 3163 return (error); 3164} 3165 3166int 3167ttyclose(struct cdev *dev, int flag, int mode, struct thread *td) 3168{ 3169 struct tty *tp; 3170 3171 tp = dev->si_tty; 3172 ttyld_close(tp, flag); 3173 ttyldoptim(tp); 3174 if (tp->t_close != NULL) 3175 tp->t_close(tp); 3176 tp->t_do_timestamp = 0; 3177 if (tp->t_pps != NULL) 3178 tp->t_pps->ppsparam.mode = 0; 3179 tty_close(tp); 3180 return (0); 3181} 3182 3183int 3184ttyread(struct cdev *dev, struct uio *uio, int flag) 3185{ 3186 struct tty *tp; 3187 3188 tp = tty_gettp(dev); 3189 3190 if (tp->t_state & TS_GONE) 3191 return (ENODEV); 3192 return (ttyld_read(tp, uio, flag)); 3193} 3194 3195int 3196ttywrite(struct cdev *dev, struct uio *uio, int flag) 3197{ 3198 struct tty *tp; 3199 3200 tp = tty_gettp(dev); 3201 3202 if (tp->t_state & TS_GONE) 3203 return (ENODEV); 3204 return (ttyld_write(tp, uio, flag)); 3205} 3206 3207int 3208ttyioctl(struct cdev *dev, u_long cmd, caddr_t data, int flag, struct thread *td) 3209{ 3210 struct tty *tp; 3211 int error; 3212 3213 tp = dev->si_tty; 3214 3215 if (cmd == TIOCSETA || cmd == TIOCSETAW || cmd == TIOCSETAF) { 3216 int cc; 3217 struct termios *dt = (struct termios *)data; 3218 struct termios *lt = 3219 ISCALLOUT(dev) ? &tp->t_lock_out : &tp->t_lock_in; 3220 3221 dt->c_iflag = (tp->t_iflag & lt->c_iflag) 3222 | (dt->c_iflag & ~lt->c_iflag); 3223 dt->c_oflag = (tp->t_oflag & lt->c_oflag) 3224 | (dt->c_oflag & ~lt->c_oflag); 3225 dt->c_cflag = (tp->t_cflag & lt->c_cflag) 3226 | (dt->c_cflag & ~lt->c_cflag); 3227 dt->c_lflag = (tp->t_lflag & lt->c_lflag) 3228 | (dt->c_lflag & ~lt->c_lflag); 3229 for (cc = 0; cc < NCCS; ++cc) 3230 if (lt->c_cc[cc] != 0) 3231 dt->c_cc[cc] = tp->t_cc[cc]; 3232 if (lt->c_ispeed != 0) 3233 dt->c_ispeed = tp->t_ispeed; 3234 if (lt->c_ospeed != 0) 3235 dt->c_ospeed = tp->t_ospeed; 3236 } 3237 3238 error = ttyld_ioctl(tp, cmd, data, flag, td); 3239 if (error == ENOIOCTL) 3240 error = ttioctl(tp, cmd, data, flag); 3241 ttyldoptim(tp); 3242 if (error != ENOIOCTL) 3243 return (error); 3244 return (ENOTTY); 3245} 3246 3247void 3248ttyldoptim(struct tty *tp) 3249{ 3250 struct termios *t; 3251 3252 t = &tp->t_termios; 3253 if (!(t->c_iflag & (ICRNL | IGNCR | IMAXBEL | INLCR | ISTRIP | IXON)) 3254 && (!(t->c_iflag & BRKINT) || (t->c_iflag & IGNBRK)) 3255 && (!(t->c_iflag & PARMRK) 3256 || (t->c_iflag & (IGNPAR | IGNBRK)) == (IGNPAR | IGNBRK)) 3257 && !(t->c_lflag & (ECHO | ICANON | IEXTEN | ISIG | PENDIN)) 3258 && linesw[tp->t_line]->l_rint == ttyinput) 3259 tp->t_state |= TS_CAN_BYPASS_L_RINT; 3260 else 3261 tp->t_state &= ~TS_CAN_BYPASS_L_RINT; 3262} 3263 3264static void 3265ttydtrwaitwakeup(void *arg) 3266{ 3267 struct tty *tp; 3268 3269 tp = arg; 3270 tp->t_state &= ~TS_DTR_WAIT; 3271 wakeup(&tp->t_dtr_wait); 3272} 3273 3274 3275void 3276ttydtrwaitstart(struct tty *tp) 3277{ 3278 3279 if (tp->t_dtr_wait == 0) 3280 return; 3281 if (tp->t_state & TS_DTR_WAIT) 3282 return; 3283 timeout(ttydtrwaitwakeup, tp, tp->t_dtr_wait); 3284 tp->t_state |= TS_DTR_WAIT; 3285} 3286 3287int 3288ttydtrwaitsleep(struct tty *tp) 3289{ 3290 int error; 3291 3292 error = 0; 3293 while (error == 0) { 3294 if (tp->t_state & TS_GONE) 3295 error = ENXIO; 3296 else if (!(tp->t_state & TS_DTR_WAIT)) 3297 break; 3298 else 3299 error = tsleep(&tp->t_dtr_wait, TTIPRI | PCATCH, 3300 "dtrwait", 0); 3301 } 3302 return (error); 3303} 3304 3305static int 3306ttysopen(struct cdev *dev, int flag, int mode, struct thread *td) 3307{ 3308 struct tty *tp; 3309 3310 tp = dev->si_tty; 3311 KASSERT(tp != NULL, 3312 ("ttysopen(): no tty pointer on device (%s)", devtoname(dev))); 3313 if (tp->t_state & TS_GONE) 3314 return (ENODEV); 3315 return (0); 3316} 3317 3318static int 3319ttysclose(struct cdev *dev, int flag, int mode, struct thread *td) 3320{ 3321 3322 return (0); 3323} 3324 3325static int 3326ttysrdwr(struct cdev *dev, struct uio *uio, int flag) 3327{ 3328 3329 return (ENODEV); 3330} 3331 3332static int 3333ttysioctl(struct cdev *dev, u_long cmd, caddr_t data, int flag, struct thread *td) 3334{ 3335 struct tty *tp; 3336 int error; 3337 struct termios *ct; 3338 3339 tp = dev->si_tty; 3340 KASSERT(tp != NULL, 3341 ("ttysopen(): no tty pointer on device (%s)", devtoname(dev))); 3342 if (tp->t_state & TS_GONE) 3343 return (ENODEV); 3344 ct = dev->si_drv2; 3345 switch (cmd) { 3346 case TIOCSETA: 3347 error = suser(td); 3348 if (error != 0) 3349 return (error); 3350 *ct = *(struct termios *)data; 3351 return (0); 3352 case TIOCGETA: 3353 *(struct termios *)data = *ct; 3354 return (0); 3355 case TIOCGETD: 3356 *(int *)data = TTYDISC; 3357 return (0); 3358 case TIOCGWINSZ: 3359 bzero(data, sizeof(struct winsize)); 3360 return (0); 3361 default: 3362 if (tp->t_cioctl != NULL) 3363 return(tp->t_cioctl(dev, cmd, data, flag, td)); 3364 return (ENOTTY); 3365 } 3366} 3367 3368/* 3369 * Initialize a tty to sane modes. 3370 */ 3371void 3372ttyinitmode(struct tty *tp, int echo, int speed) 3373{ 3374 3375 if (speed == 0) 3376 speed = TTYDEF_SPEED; 3377 tp->t_init_in.c_iflag = TTYDEF_IFLAG; 3378 tp->t_init_in.c_oflag = TTYDEF_OFLAG; 3379 tp->t_init_in.c_cflag = TTYDEF_CFLAG; 3380 if (echo) 3381 tp->t_init_in.c_lflag = TTYDEF_LFLAG_ECHO; 3382 else 3383 tp->t_init_in.c_lflag = TTYDEF_LFLAG_NOECHO; 3384 3385 tp->t_init_in.c_ispeed = tp->t_init_in.c_ospeed = speed; 3386 termioschars(&tp->t_init_in); 3387 tp->t_init_out = tp->t_init_in; 3388 tp->t_termios = tp->t_init_in; 3389} 3390 3391/* 3392 * Use more "normal" termios paramters for consoles. 3393 */ 3394void 3395ttyconsolemode(struct tty *tp, int speed) 3396{ 3397 3398 if (speed == 0) 3399 speed = TTYDEF_SPEED; 3400 ttyinitmode(tp, 1, speed); 3401 tp->t_init_in.c_cflag |= CLOCAL; 3402 tp->t_lock_out.c_cflag = tp->t_lock_in.c_cflag = CLOCAL; 3403 tp->t_lock_out.c_ispeed = tp->t_lock_out.c_ospeed = 3404 tp->t_lock_in.c_ispeed = tp->t_lock_in.c_ospeed = speed; 3405 tp->t_init_out = tp->t_init_in; 3406 tp->t_termios = tp->t_init_in; 3407} 3408 3409/* 3410 * Record the relationship between the serial ports notion of modem control 3411 * signals and the one used in certain ioctls in a way the compiler can enforce 3412 * XXX: We should define TIOCM_* in terms of SER_ if we can limit the 3413 * XXX: consequences of the #include work that would take. 3414 */ 3415CTASSERT(SER_DTR == TIOCM_DTR / 2); 3416CTASSERT(SER_RTS == TIOCM_RTS / 2); 3417CTASSERT(SER_STX == TIOCM_ST / 2); 3418CTASSERT(SER_SRX == TIOCM_SR / 2); 3419CTASSERT(SER_CTS == TIOCM_CTS / 2); 3420CTASSERT(SER_DCD == TIOCM_DCD / 2); 3421CTASSERT(SER_RI == TIOCM_RI / 2); 3422CTASSERT(SER_DSR == TIOCM_DSR / 2); 3423 3424