Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/kern/tty.c
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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("$FreeBSD$"); 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> 113 114 MALLOC_DEFINE(M_TTYS, "ttys", "tty data structures"); 115 116 long tk_cancc; 117 long tk_nin; 118 long tk_nout; 119 long tk_rawcc; 120 121 static d_open_t ttysopen; 122 static d_close_t ttysclose; 123 static d_read_t ttysrdwr; 124 static d_ioctl_t ttysioctl; 125 static d_purge_t ttypurge; 126 127 /* Default cdevsw for common tty devices */ 128 static 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 */ 139 static 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 }; 149 150 static int proc_sum(struct proc *, int *); 151 static int proc_compare(struct proc *, struct proc *); 152 static int thread_compare(struct thread *, struct thread *); 153 static int ttnread(struct tty *tp); 154 static void ttyecho(int c, struct tty *tp); 155 static int ttyoutput(int c, struct tty *tp); 156 static void ttypend(struct tty *tp); 157 static void ttyretype(struct tty *tp); 158 static void ttyrub(int c, struct tty *tp); 159 static void ttyrubo(struct tty *tp, int cnt); 160 static void ttyunblock(struct tty *tp); 161 static int ttywflush(struct tty *tp); 162 static int filt_ttyread(struct knote *kn, long hint); 163 static void filt_ttyrdetach(struct knote *kn); 164 static int filt_ttywrite(struct knote *kn, long hint); 165 static void filt_ttywdetach(struct knote *kn); 166 167 /* 168 * Table with character classes and parity. The 8th bit indicates parity, 169 * the 7th bit indicates the character is an alphameric or underscore (for 170 * ALTWERASE), and the low 6 bits indicate delay type. If the low 6 bits 171 * are 0 then the character needs no special processing on output; classes 172 * other than 0 might be translated or (not currently) require delays. 173 */ 174 #define E 0x00 /* Even parity. */ 175 #define O 0x80 /* Odd parity. */ 176 #define PARITY(c) (char_type[c] & O) 177 178 #define ALPHA 0x40 /* Alpha or underscore. */ 179 #define ISALPHA(c) (char_type[(c) & TTY_CHARMASK] & ALPHA) 180 181 #define CCLASSMASK 0x3f 182 #define CCLASS(c) (char_type[c] & CCLASSMASK) 183 184 #define BS BACKSPACE 185 #define CC CONTROL 186 #define CR RETURN 187 #define NA ORDINARY | ALPHA 188 #define NL NEWLINE 189 #define NO ORDINARY 190 #define TB TAB 191 #define VT VTAB 192 193 static u_char const char_type[] = { 194 E|CC, O|CC, O|CC, E|CC, O|CC, E|CC, E|CC, O|CC, /* nul - bel */ 195 O|BS, E|TB, E|NL, O|CC, E|VT, O|CR, O|CC, E|CC, /* bs - si */ 196 O|CC, E|CC, E|CC, O|CC, E|CC, O|CC, O|CC, E|CC, /* dle - etb */ 197 E|CC, O|CC, O|CC, E|CC, O|CC, E|CC, E|CC, O|CC, /* can - us */ 198 O|NO, E|NO, E|NO, O|NO, E|NO, O|NO, O|NO, E|NO, /* sp - ' */ 199 E|NO, O|NO, O|NO, E|NO, O|NO, E|NO, E|NO, O|NO, /* ( - / */ 200 E|NA, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* 0 - 7 */ 201 O|NA, E|NA, E|NO, O|NO, E|NO, O|NO, O|NO, E|NO, /* 8 - ? */ 202 O|NO, E|NA, E|NA, O|NA, E|NA, O|NA, O|NA, E|NA, /* @ - G */ 203 E|NA, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* H - O */ 204 E|NA, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* P - W */ 205 O|NA, E|NA, E|NA, O|NO, E|NO, O|NO, O|NO, O|NA, /* X - _ */ 206 E|NO, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* ` - g */ 207 O|NA, E|NA, E|NA, O|NA, E|NA, O|NA, O|NA, E|NA, /* h - o */ 208 O|NA, E|NA, E|NA, O|NA, E|NA, O|NA, O|NA, E|NA, /* p - w */ 209 E|NA, O|NA, O|NA, E|NO, O|NO, E|NO, E|NO, O|CC, /* x - del */ 210 /* 211 * Meta chars; should be settable per character set; 212 * for now, treat them all as normal characters. 213 */ 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 NA, NA, NA, NA, NA, NA, NA, NA, 230 }; 231 #undef BS 232 #undef CC 233 #undef CR 234 #undef NA 235 #undef NL 236 #undef NO 237 #undef TB 238 #undef VT 239 240 /* Macros to clear/set/test flags. */ 241 #define SET(t, f) (t) |= (f) 242 #define CLR(t, f) (t) &= ~(f) 243 #define ISSET(t, f) ((t) & (f)) 244 245 #undef MAX_INPUT /* XXX wrong in <sys/syslimits.h> */ 246 #define MAX_INPUT TTYHOG /* XXX limit is usually larger for !ICANON */ 247 248 /* 249 * list of struct tty where pstat(8) can pick it up with sysctl 250 * 251 * The lock order is to grab the list mutex before the tty mutex. 252 * Together with additions going on the tail of the list, this allows 253 * the sysctl to avoid doing retries. 254 */ 255 static TAILQ_HEAD(, tty) tty_list = TAILQ_HEAD_INITIALIZER(tty_list); 256 static struct mtx tty_list_mutex; 257 MTX_SYSINIT(tty_list, &tty_list_mutex, "ttylist", MTX_DEF); 258 259 static struct unrhdr *tty_unit; 260 261 static int drainwait = 5*60; 262 SYSCTL_INT(_kern, OID_AUTO, drainwait, CTLFLAG_RW, &drainwait, 263 0, "Output drain timeout in seconds"); 264 265 static struct tty * 266 tty_gettp(struct cdev *dev) 267 { 268 struct tty *tp; 269 struct cdevsw *csw; 270 271 csw = dev_refthread(dev); 272 if (csw == NULL) 273 return (NULL); 274 KASSERT(csw->d_flags & D_TTY, 275 ("non D_TTY (%s) in tty code", devtoname(dev))); 276 tp = dev->si_tty; 277 dev_relthread(dev); 278 KASSERT(tp != NULL, 279 ("no tty pointer on (%s) in tty code", devtoname(dev))); 280 return (tp); 281 } 282 283 /* 284 * Initial open of tty, or (re)entry to standard tty line discipline. 285 */ 286 int 287 tty_open(struct cdev *device, struct tty *tp) 288 { 289 int s; 290 291 s = spltty(); 292 tp->t_dev = device; 293 tp->t_hotchar = 0; 294 if (!ISSET(tp->t_state, TS_ISOPEN)) { 295 ttyref(tp); 296 SET(tp->t_state, TS_ISOPEN); 297 if (ISSET(tp->t_cflag, CLOCAL)) 298 SET(tp->t_state, TS_CONNECTED); 299 bzero(&tp->t_winsize, sizeof(tp->t_winsize)); 300 } 301 /* XXX don't hang forever on output */ 302 if (tp->t_timeout < 0) 303 tp->t_timeout = drainwait*hz; 304 ttsetwater(tp); 305 splx(s); 306 return (0); 307 } 308 309 /* 310 * Handle close() on a tty line: flush and set to initial state, 311 * bumping generation number so that pending read/write calls 312 * can detect recycling of the tty. 313 * XXX our caller should have done `spltty(); l_close(); tty_close();' 314 * and l_close() should have flushed, but we repeat the spltty() and 315 * the flush in case there are buggy callers. 316 */ 317 int 318 tty_close(struct tty *tp) 319 { 320 int ostate, s; 321 322 funsetown(&tp->t_sigio); 323 s = spltty(); 324 if (constty == tp) 325 constty_clear(); 326 327 ttyflush(tp, FREAD | FWRITE); 328 clist_free_cblocks(&tp->t_canq); 329 clist_free_cblocks(&tp->t_outq); 330 clist_free_cblocks(&tp->t_rawq); 331 332 tp->t_gen++; 333 tp->t_line = TTYDISC; 334 tp->t_hotchar = 0; 335 tp->t_pgrp = NULL; 336 tp->t_session = NULL; 337 ostate = tp->t_state; 338 tp->t_state = 0; 339 knlist_clear(&tp->t_rsel.si_note, 0); 340 knlist_clear(&tp->t_wsel.si_note, 0); 341 /* 342 * Both final close and revocation close might end up calling 343 * this method. Only the thread clearing TS_ISOPEN should 344 * release the reference to the tty. 345 */ 346 if (ISSET(ostate, TS_ISOPEN)) 347 ttyrel(tp); 348 splx(s); 349 return (0); 350 } 351 352 #define FLUSHQ(q) { \ 353 if ((q)->c_cc) \ 354 ndflush(q, (q)->c_cc); \ 355 } 356 357 /* Is 'c' a line delimiter ("break" character)? */ 358 #define TTBREAKC(c, lflag) \ 359 ((c) == '\n' || (((c) == cc[VEOF] || \ 360 (c) == cc[VEOL] || ((c) == cc[VEOL2] && lflag & IEXTEN)) && \ 361 (c) != _POSIX_VDISABLE)) 362 363 /* 364 * Process input of a single character received on a tty. 365 */ 366 int 367 ttyinput(int c, struct tty *tp) 368 { 369 tcflag_t iflag, lflag; 370 cc_t *cc; 371 int i, err; 372 373 /* 374 * If input is pending take it first. 375 */ 376 lflag = tp->t_lflag; 377 if (ISSET(lflag, PENDIN)) 378 ttypend(tp); 379 /* 380 * Gather stats. 381 */ 382 if (ISSET(lflag, ICANON)) { 383 ++tk_cancc; 384 ++tp->t_cancc; 385 } else { 386 ++tk_rawcc; 387 ++tp->t_rawcc; 388 } 389 ++tk_nin; 390 391 /* 392 * Block further input iff: 393 * current input > threshold AND input is available to user program 394 * AND input flow control is enabled and not yet invoked. 395 * The 3 is slop for PARMRK. 396 */ 397 iflag = tp->t_iflag; 398 if (tp->t_rawq.c_cc + tp->t_canq.c_cc > tp->t_ihiwat - 3 && 399 (!ISSET(lflag, ICANON) || tp->t_canq.c_cc != 0) && 400 (ISSET(tp->t_cflag, CRTS_IFLOW) || ISSET(iflag, IXOFF)) && 401 !ISSET(tp->t_state, TS_TBLOCK)) 402 ttyblock(tp); 403 404 /* Handle exceptional conditions (break, parity, framing). */ 405 cc = tp->t_cc; 406 err = (ISSET(c, TTY_ERRORMASK)); 407 if (err) { 408 CLR(c, TTY_ERRORMASK); 409 if (ISSET(err, TTY_BI)) { 410 if (ISSET(iflag, IGNBRK)) 411 return (0); 412 if (ISSET(iflag, BRKINT)) { 413 ttyflush(tp, FREAD | FWRITE); 414 if (tp->t_pgrp != NULL) { 415 PGRP_LOCK(tp->t_pgrp); 416 pgsignal(tp->t_pgrp, SIGINT, 1); 417 PGRP_UNLOCK(tp->t_pgrp); 418 } 419 goto endcase; 420 } 421 if (ISSET(iflag, PARMRK)) 422 goto parmrk; 423 } else if ((ISSET(err, TTY_PE) && ISSET(iflag, INPCK)) 424 || ISSET(err, TTY_FE)) { 425 if (ISSET(iflag, IGNPAR)) 426 return (0); 427 else if (ISSET(iflag, PARMRK)) { 428 parmrk: 429 if (tp->t_rawq.c_cc + tp->t_canq.c_cc > 430 MAX_INPUT - 3) 431 goto input_overflow; 432 (void)putc(0377 | TTY_QUOTE, &tp->t_rawq); 433 (void)putc(0 | TTY_QUOTE, &tp->t_rawq); 434 (void)putc(c | TTY_QUOTE, &tp->t_rawq); 435 goto endcase; 436 } else 437 c = 0; 438 } 439 } 440 441 if (!ISSET(tp->t_state, TS_TYPEN) && ISSET(iflag, ISTRIP)) 442 CLR(c, 0x80); 443 if (!ISSET(lflag, EXTPROC)) { 444 /* 445 * Check for literal nexting very first 446 */ 447 if (ISSET(tp->t_state, TS_LNCH)) { 448 SET(c, TTY_QUOTE); 449 CLR(tp->t_state, TS_LNCH); 450 } 451 /* 452 * Scan for special characters. This code 453 * is really just a big case statement with 454 * non-constant cases. The bottom of the 455 * case statement is labeled ``endcase'', so goto 456 * it after a case match, or similar. 457 */ 458 459 /* 460 * Control chars which aren't controlled 461 * by ICANON, ISIG, or IXON. 462 */ 463 if (ISSET(lflag, IEXTEN)) { 464 if (CCEQ(cc[VLNEXT], c)) { 465 if (ISSET(lflag, ECHO)) { 466 if (ISSET(lflag, ECHOE)) { 467 (void)ttyoutput('^', tp); 468 (void)ttyoutput('\b', tp); 469 } else 470 ttyecho(c, tp); 471 } 472 SET(tp->t_state, TS_LNCH); 473 goto endcase; 474 } 475 if (CCEQ(cc[VDISCARD], c)) { 476 if (ISSET(lflag, FLUSHO)) 477 CLR(tp->t_lflag, FLUSHO); 478 else { 479 ttyflush(tp, FWRITE); 480 ttyecho(c, tp); 481 if (tp->t_rawq.c_cc + tp->t_canq.c_cc) 482 ttyretype(tp); 483 SET(tp->t_lflag, FLUSHO); 484 } 485 goto startoutput; 486 } 487 } 488 /* 489 * Signals. 490 */ 491 if (ISSET(lflag, ISIG)) { 492 if (CCEQ(cc[VINTR], c) || CCEQ(cc[VQUIT], c)) { 493 if (!ISSET(lflag, NOFLSH)) 494 ttyflush(tp, FREAD | FWRITE); 495 ttyecho(c, tp); 496 if (tp->t_pgrp != NULL) { 497 PGRP_LOCK(tp->t_pgrp); 498 pgsignal(tp->t_pgrp, 499 CCEQ(cc[VINTR], c) ? SIGINT : SIGQUIT, 1); 500 PGRP_UNLOCK(tp->t_pgrp); 501 } 502 goto endcase; 503 } 504 if (CCEQ(cc[VSUSP], c)) { 505 if (!ISSET(lflag, NOFLSH)) 506 ttyflush(tp, FREAD); 507 ttyecho(c, tp); 508 if (tp->t_pgrp != NULL) { 509 PGRP_LOCK(tp->t_pgrp); 510 pgsignal(tp->t_pgrp, SIGTSTP, 1); 511 PGRP_UNLOCK(tp->t_pgrp); 512 } 513 goto endcase; 514 } 515 } 516 /* 517 * Handle start/stop characters. 518 */ 519 if (ISSET(iflag, IXON)) { 520 if (CCEQ(cc[VSTOP], c)) { 521 if (!ISSET(tp->t_state, TS_TTSTOP)) { 522 SET(tp->t_state, TS_TTSTOP); 523 tt_stop(tp, 0); 524 return (0); 525 } 526 if (!CCEQ(cc[VSTART], c)) 527 return (0); 528 /* 529 * if VSTART == VSTOP then toggle 530 */ 531 goto endcase; 532 } 533 if (CCEQ(cc[VSTART], c)) 534 goto restartoutput; 535 } 536 /* 537 * IGNCR, ICRNL, & INLCR 538 */ 539 if (c == '\r') { 540 if (ISSET(iflag, IGNCR)) 541 return (0); 542 else if (ISSET(iflag, ICRNL)) 543 c = '\n'; 544 } else if (c == '\n' && ISSET(iflag, INLCR)) 545 c = '\r'; 546 } 547 if (!ISSET(tp->t_lflag, EXTPROC) && ISSET(lflag, ICANON)) { 548 /* 549 * From here on down canonical mode character 550 * processing takes place. 551 */ 552 /* 553 * erase or erase2 (^H / ^?) 554 */ 555 if (CCEQ(cc[VERASE], c) || CCEQ(cc[VERASE2], c) ) { 556 if (tp->t_rawq.c_cc) 557 ttyrub(unputc(&tp->t_rawq), tp); 558 goto endcase; 559 } 560 /* 561 * kill (^U) 562 */ 563 if (CCEQ(cc[VKILL], c)) { 564 if (ISSET(lflag, ECHOKE) && 565 tp->t_rawq.c_cc == tp->t_rocount && 566 !ISSET(lflag, ECHOPRT)) 567 while (tp->t_rawq.c_cc) 568 ttyrub(unputc(&tp->t_rawq), tp); 569 else { 570 ttyecho(c, tp); 571 if (ISSET(lflag, ECHOK) || 572 ISSET(lflag, ECHOKE)) 573 ttyecho('\n', tp); 574 FLUSHQ(&tp->t_rawq); 575 tp->t_rocount = 0; 576 } 577 CLR(tp->t_state, TS_LOCAL); 578 goto endcase; 579 } 580 /* 581 * word erase (^W) 582 */ 583 if (CCEQ(cc[VWERASE], c) && ISSET(lflag, IEXTEN)) { 584 int ctype; 585 586 /* 587 * erase whitespace 588 */ 589 while ((c = unputc(&tp->t_rawq)) == ' ' || c == '\t') 590 ttyrub(c, tp); 591 if (c == -1) 592 goto endcase; 593 /* 594 * erase last char of word and remember the 595 * next chars type (for ALTWERASE) 596 */ 597 ttyrub(c, tp); 598 c = unputc(&tp->t_rawq); 599 if (c == -1) 600 goto endcase; 601 if (c == ' ' || c == '\t') { 602 (void)putc(c, &tp->t_rawq); 603 goto endcase; 604 } 605 ctype = ISALPHA(c); 606 /* 607 * erase rest of word 608 */ 609 do { 610 ttyrub(c, tp); 611 c = unputc(&tp->t_rawq); 612 if (c == -1) 613 goto endcase; 614 } while (c != ' ' && c != '\t' && 615 (!ISSET(lflag, ALTWERASE) || ISALPHA(c) == ctype)); 616 (void)putc(c, &tp->t_rawq); 617 goto endcase; 618 } 619 /* 620 * reprint line (^R) 621 */ 622 if (CCEQ(cc[VREPRINT], c) && ISSET(lflag, IEXTEN)) { 623 ttyretype(tp); 624 goto endcase; 625 } 626 /* 627 * ^T - kernel info and generate SIGINFO 628 */ 629 if (CCEQ(cc[VSTATUS], c) && ISSET(lflag, IEXTEN)) { 630 if (ISSET(lflag, ISIG) && tp->t_pgrp != NULL) { 631 PGRP_LOCK(tp->t_pgrp); 632 pgsignal(tp->t_pgrp, SIGINFO, 1); 633 PGRP_UNLOCK(tp->t_pgrp); 634 } 635 if (!ISSET(lflag, NOKERNINFO)) 636 ttyinfo(tp); 637 goto endcase; 638 } 639 } 640 /* 641 * Check for input buffer overflow 642 */ 643 if (tp->t_rawq.c_cc + tp->t_canq.c_cc >= MAX_INPUT) { 644 input_overflow: 645 if (ISSET(iflag, IMAXBEL)) { 646 if (tp->t_outq.c_cc < tp->t_ohiwat) 647 (void)ttyoutput(CTRL('g'), tp); 648 } 649 goto endcase; 650 } 651 652 if ( c == 0377 && ISSET(iflag, PARMRK) && !ISSET(iflag, ISTRIP) 653 && ISSET(iflag, IGNBRK|IGNPAR) != (IGNBRK|IGNPAR)) 654 (void)putc(0377 | TTY_QUOTE, &tp->t_rawq); 655 656 /* 657 * Put data char in q for user and 658 * wakeup on seeing a line delimiter. 659 */ 660 if (putc(c, &tp->t_rawq) >= 0) { 661 if (!ISSET(lflag, ICANON)) { 662 ttwakeup(tp); 663 ttyecho(c, tp); 664 goto endcase; 665 } 666 if (TTBREAKC(c, lflag)) { 667 tp->t_rocount = 0; 668 catq(&tp->t_rawq, &tp->t_canq); 669 ttwakeup(tp); 670 } else if (tp->t_rocount++ == 0) 671 tp->t_rocol = tp->t_column; 672 if (ISSET(tp->t_state, TS_ERASE)) { 673 /* 674 * end of prterase \.../ 675 */ 676 CLR(tp->t_state, TS_ERASE); 677 (void)ttyoutput('/', tp); 678 } 679 i = tp->t_column; 680 ttyecho(c, tp); 681 if (CCEQ(cc[VEOF], c) && ISSET(lflag, ECHO)) { 682 /* 683 * Place the cursor over the '^' of the ^D. 684 */ 685 i = imin(2, tp->t_column - i); 686 while (i > 0) { 687 (void)ttyoutput('\b', tp); 688 i--; 689 } 690 } 691 } 692 endcase: 693 /* 694 * IXANY means allow any character to restart output. 695 */ 696 if (ISSET(tp->t_state, TS_TTSTOP) && 697 !ISSET(iflag, IXANY) && cc[VSTART] != cc[VSTOP]) 698 return (0); 699 restartoutput: 700 CLR(tp->t_lflag, FLUSHO); 701 CLR(tp->t_state, TS_TTSTOP); 702 startoutput: 703 return (ttstart(tp)); 704 } 705 706 /* 707 * Output a single character on a tty, doing output processing 708 * as needed (expanding tabs, newline processing, etc.). 709 * Returns < 0 if succeeds, otherwise returns char to resend. 710 * Must be recursive. 711 */ 712 static int 713 ttyoutput(int c, struct tty *tp) 714 { 715 tcflag_t oflag; 716 int col, s; 717 718 oflag = tp->t_oflag; 719 if (!ISSET(oflag, OPOST)) { 720 if (ISSET(tp->t_lflag, FLUSHO)) 721 return (-1); 722 if (putc(c, &tp->t_outq)) 723 return (c); 724 tk_nout++; 725 tp->t_outcc++; 726 return (-1); 727 } 728 /* 729 * Do tab expansion if OXTABS is set. Special case if we external 730 * processing, we don't do the tab expansion because we'll probably 731 * get it wrong. If tab expansion needs to be done, let it happen 732 * externally. 733 */ 734 CLR(c, ~TTY_CHARMASK); 735 if (c == '\t' && 736 ISSET(oflag, OXTABS) && !ISSET(tp->t_lflag, EXTPROC)) { 737 c = 8 - (tp->t_column & 7); 738 if (!ISSET(tp->t_lflag, FLUSHO)) { 739 s = spltty(); /* Don't interrupt tabs. */ 740 c -= b_to_q(" ", c, &tp->t_outq); 741 tk_nout += c; 742 tp->t_outcc += c; 743 splx(s); 744 } 745 tp->t_column += c; 746 return (c ? -1 : '\t'); 747 } 748 if (c == CEOT && ISSET(oflag, ONOEOT)) 749 return (-1); 750 751 /* 752 * Newline translation: if ONLCR is set, 753 * translate newline into "\r\n". 754 */ 755 if (c == '\n' && ISSET(tp->t_oflag, ONLCR)) { 756 tk_nout++; 757 tp->t_outcc++; 758 if (!ISSET(tp->t_lflag, FLUSHO) && putc('\r', &tp->t_outq)) 759 return (c); 760 } 761 /* If OCRNL is set, translate "\r" into "\n". */ 762 else if (c == '\r' && ISSET(tp->t_oflag, OCRNL)) 763 c = '\n'; 764 /* If ONOCR is set, don't transmit CRs when on column 0. */ 765 else if (c == '\r' && ISSET(tp->t_oflag, ONOCR) && tp->t_column == 0) 766 return (-1); 767 768 tk_nout++; 769 tp->t_outcc++; 770 if (!ISSET(tp->t_lflag, FLUSHO) && putc(c, &tp->t_outq)) 771 return (c); 772 773 col = tp->t_column; 774 switch (CCLASS(c)) { 775 case BACKSPACE: 776 if (col > 0) 777 --col; 778 break; 779 case CONTROL: 780 break; 781 case NEWLINE: 782 if (ISSET(tp->t_oflag, ONLCR | ONLRET)) 783 col = 0; 784 break; 785 case RETURN: 786 col = 0; 787 break; 788 case ORDINARY: 789 ++col; 790 break; 791 case TAB: 792 col = (col + 8) & ~7; 793 break; 794 } 795 tp->t_column = col; 796 return (-1); 797 } 798 799 /* 800 * Ioctls for all tty devices. Called after line-discipline specific ioctl 801 * has been called to do discipline-specific functions and/or reject any 802 * of these ioctl commands. 803 */ 804 /* ARGSUSED */ 805 int 806 ttioctl(struct tty *tp, u_long cmd, void *data, int flag) 807 { 808 struct proc *p; 809 struct thread *td; 810 struct pgrp *pgrp; 811 int s, error, bits, sig, sig2; 812 813 td = curthread; /* XXX */ 814 p = td->td_proc; 815 816 /* If the ioctl involves modification, hang if in the background. */ 817 switch (cmd) { 818 case TIOCCBRK: 819 case TIOCCONS: 820 case TIOCDRAIN: 821 case TIOCEXCL: 822 case TIOCFLUSH: 823 #ifdef TIOCHPCL 824 case TIOCHPCL: 825 #endif 826 case TIOCNXCL: 827 case TIOCSBRK: 828 case TIOCSCTTY: 829 case TIOCSDRAINWAIT: 830 case TIOCSETA: 831 case TIOCSETAF: 832 case TIOCSETAW: 833 case TIOCSETD: 834 case TIOCSPGRP: 835 case TIOCSTART: 836 case TIOCSTAT: 837 case TIOCSTI: 838 case TIOCSTOP: 839 case TIOCSWINSZ: 840 #if defined(COMPAT_43TTY) 841 case TIOCLBIC: 842 case TIOCLBIS: 843 case TIOCLSET: 844 case TIOCSETC: 845 case OTIOCSETD: 846 case TIOCSETN: 847 case TIOCSETP: 848 case TIOCSLTC: 849 #endif 850 sx_slock(&proctree_lock); 851 PROC_LOCK(p); 852 while (isbackground(p, tp) && !(p->p_flag & P_PPWAIT) && 853 !SIGISMEMBER(p->p_sigacts->ps_sigignore, SIGTTOU) && 854 !SIGISMEMBER(td->td_sigmask, SIGTTOU)) { 855 pgrp = p->p_pgrp; 856 PROC_UNLOCK(p); 857 if (pgrp->pg_jobc == 0) { 858 sx_sunlock(&proctree_lock); 859 return (EIO); 860 } 861 PGRP_LOCK(pgrp); 862 sx_sunlock(&proctree_lock); 863 pgsignal(pgrp, SIGTTOU, 1); 864 PGRP_UNLOCK(pgrp); 865 error = ttysleep(tp, &lbolt, TTOPRI | PCATCH, "ttybg1", 866 0); 867 if (error) 868 return (error); 869 sx_slock(&proctree_lock); 870 PROC_LOCK(p); 871 } 872 PROC_UNLOCK(p); 873 sx_sunlock(&proctree_lock); 874 break; 875 } 876 877 878 if (tp->t_modem != NULL) { 879 switch (cmd) { 880 case TIOCSDTR: 881 tt_modem(tp, SER_DTR, 0); 882 return (0); 883 case TIOCCDTR: 884 tt_modem(tp, 0, SER_DTR); 885 return (0); 886 case TIOCMSET: 887 bits = *(int *)data; 888 sig = (bits & (TIOCM_DTR | TIOCM_RTS)) >> 1; 889 sig2 = ((~bits) & (TIOCM_DTR | TIOCM_RTS)) >> 1; 890 tt_modem(tp, sig, sig2); 891 return (0); 892 case TIOCMBIS: 893 bits = *(int *)data; 894 sig = (bits & (TIOCM_DTR | TIOCM_RTS)) >> 1; 895 tt_modem(tp, sig, 0); 896 return (0); 897 case TIOCMBIC: 898 bits = *(int *)data; 899 sig = (bits & (TIOCM_DTR | TIOCM_RTS)) >> 1; 900 tt_modem(tp, 0, sig); 901 return (0); 902 case TIOCMGET: 903 sig = tt_modem(tp, 0, 0); 904 /* See <sys/serial.h. for the "<< 1" stuff */ 905 bits = TIOCM_LE + (sig << 1); 906 *(int *)data = bits; 907 return (0); 908 default: 909 break; 910 } 911 } 912 913 if (tp->t_pps != NULL) { 914 error = pps_ioctl(cmd, data, tp->t_pps); 915 if (error != ENOIOCTL) 916 return (error); 917 } 918 919 switch (cmd) { /* Process the ioctl. */ 920 case FIOASYNC: /* set/clear async i/o */ 921 s = spltty(); 922 if (*(int *)data) 923 SET(tp->t_state, TS_ASYNC); 924 else 925 CLR(tp->t_state, TS_ASYNC); 926 splx(s); 927 break; 928 case FIONBIO: /* set/clear non-blocking i/o */ 929 break; /* XXX: delete. */ 930 case FIONREAD: /* get # bytes to read */ 931 s = spltty(); 932 *(int *)data = ttnread(tp); 933 splx(s); 934 break; 935 936 case FIOSETOWN: 937 /* 938 * Policy -- Don't allow FIOSETOWN on someone else's 939 * controlling tty 940 */ 941 if (tp->t_session != NULL && !isctty(p, tp)) 942 return (ENOTTY); 943 944 error = fsetown(*(int *)data, &tp->t_sigio); 945 if (error) 946 return (error); 947 break; 948 case FIOGETOWN: 949 if (tp->t_session != NULL && !isctty(p, tp)) 950 return (ENOTTY); 951 *(int *)data = fgetown(&tp->t_sigio); 952 break; 953 954 case TIOCEXCL: /* set exclusive use of tty */ 955 s = spltty(); 956 SET(tp->t_state, TS_XCLUDE); 957 splx(s); 958 break; 959 case TIOCFLUSH: { /* flush buffers */ 960 int flags = *(int *)data; 961 962 if (flags == 0) 963 flags = FREAD | FWRITE; 964 else 965 flags &= FREAD | FWRITE; 966 ttyflush(tp, flags); 967 break; 968 } 969 case TIOCCONS: /* become virtual console */ 970 if (*(int *)data) { 971 struct nameidata nid; 972 973 if (constty && constty != tp && 974 ISSET(constty->t_state, TS_CONNECTED)) 975 return (EBUSY); 976 977 /* Ensure user can open the real console. */ 978 NDINIT(&nid, LOOKUP, LOCKLEAF | FOLLOW, UIO_SYSSPACE, 979 "/dev/console", td); 980 if ((error = namei(&nid)) != 0) 981 return (error); 982 NDFREE(&nid, NDF_ONLY_PNBUF); 983 error = VOP_ACCESS(nid.ni_vp, VREAD, td->td_ucred, td); 984 vput(nid.ni_vp); 985 if (error) 986 return (error); 987 988 constty_set(tp); 989 } else if (tp == constty) 990 constty_clear(); 991 break; 992 case TIOCDRAIN: /* wait till output drained */ 993 error = ttywait(tp); 994 if (error) 995 return (error); 996 break; 997 case TIOCGETA: { /* get termios struct */ 998 struct termios *t = (struct termios *)data; 999 1000 bcopy(&tp->t_termios, t, sizeof(struct termios)); 1001 break; 1002 } 1003 case TIOCGETD: /* get line discipline */ 1004 *(int *)data = tp->t_line; 1005 break; 1006 case TIOCGWINSZ: /* get window size */ 1007 *(struct winsize *)data = tp->t_winsize; 1008 break; 1009 case TIOCGPGRP: /* get pgrp of tty */ 1010 if (!isctty(p, tp)) 1011 return (ENOTTY); 1012 *(int *)data = tp->t_pgrp ? tp->t_pgrp->pg_id : NO_PID; 1013 break; 1014 #ifdef TIOCHPCL 1015 case TIOCHPCL: /* hang up on last close */ 1016 s = spltty(); 1017 SET(tp->t_cflag, HUPCL); 1018 splx(s); 1019 break; 1020 #endif 1021 case TIOCMGDTRWAIT: 1022 *(int *)data = tp->t_dtr_wait * 100 / hz; 1023 break; 1024 case TIOCMSDTRWAIT: 1025 /* must be root since the wait applies to following logins */ 1026 error = priv_check(td, PRIV_TTY_DTRWAIT); 1027 if (error) 1028 return (error); 1029 tp->t_dtr_wait = *(int *)data * hz / 100; 1030 break; 1031 case TIOCNXCL: /* reset exclusive use of tty */ 1032 s = spltty(); 1033 CLR(tp->t_state, TS_XCLUDE); 1034 splx(s); 1035 break; 1036 case TIOCOUTQ: /* output queue size */ 1037 *(int *)data = tp->t_outq.c_cc; 1038 break; 1039 case TIOCSETA: /* set termios struct */ 1040 case TIOCSETAW: /* drain output, set */ 1041 case TIOCSETAF: { /* drn out, fls in, set */ 1042 struct termios *t = (struct termios *)data; 1043 1044 if (t->c_ispeed == 0) 1045 t->c_ispeed = t->c_ospeed; 1046 if (t->c_ispeed == 0) 1047 t->c_ispeed = tp->t_ospeed; 1048 if (t->c_ispeed == 0) 1049 return (EINVAL); 1050 s = spltty(); 1051 if (cmd == TIOCSETAW || cmd == TIOCSETAF) { 1052 error = ttywait(tp); 1053 if (error) { 1054 splx(s); 1055 return (error); 1056 } 1057 if (cmd == TIOCSETAF) 1058 ttyflush(tp, FREAD); 1059 } 1060 if (!ISSET(t->c_cflag, CIGNORE)) { 1061 /* 1062 * Set device hardware. 1063 */ 1064 error = tt_param(tp, t); 1065 if (error) { 1066 splx(s); 1067 return (error); 1068 } 1069 if (ISSET(t->c_cflag, CLOCAL) && 1070 !ISSET(tp->t_cflag, CLOCAL)) { 1071 /* 1072 * XXX disconnections would be too hard to 1073 * get rid of without this kludge. The only 1074 * way to get rid of controlling terminals 1075 * is to exit from the session leader. 1076 */ 1077 CLR(tp->t_state, TS_ZOMBIE); 1078 1079 wakeup(TSA_CARR_ON(tp)); 1080 ttwakeup(tp); 1081 ttwwakeup(tp); 1082 } 1083 if ((ISSET(tp->t_state, TS_CARR_ON) || 1084 ISSET(t->c_cflag, CLOCAL)) && 1085 !ISSET(tp->t_state, TS_ZOMBIE)) 1086 SET(tp->t_state, TS_CONNECTED); 1087 else 1088 CLR(tp->t_state, TS_CONNECTED); 1089 tp->t_cflag = t->c_cflag; 1090 tp->t_ispeed = t->c_ispeed; 1091 if (t->c_ospeed != 0) 1092 tp->t_ospeed = t->c_ospeed; 1093 ttsetwater(tp); 1094 } 1095 if (ISSET(t->c_lflag, ICANON) != ISSET(tp->t_lflag, ICANON) && 1096 cmd != TIOCSETAF) { 1097 if (ISSET(t->c_lflag, ICANON)) 1098 SET(tp->t_lflag, PENDIN); 1099 else { 1100 /* 1101 * XXX we really shouldn't allow toggling 1102 * ICANON while we're in a non-termios line 1103 * discipline. Now we have to worry about 1104 * panicing for a null queue. 1105 */ 1106 if (tp->t_canq.c_cbreserved > 0 && 1107 tp->t_rawq.c_cbreserved > 0) { 1108 catq(&tp->t_rawq, &tp->t_canq); 1109 /* 1110 * XXX the queue limits may be 1111 * different, so the old queue 1112 * swapping method no longer works. 1113 */ 1114 catq(&tp->t_canq, &tp->t_rawq); 1115 } 1116 CLR(tp->t_lflag, PENDIN); 1117 } 1118 ttwakeup(tp); 1119 } 1120 tp->t_iflag = t->c_iflag; 1121 tp->t_oflag = t->c_oflag; 1122 /* 1123 * Make the EXTPROC bit read only. 1124 */ 1125 if (ISSET(tp->t_lflag, EXTPROC)) 1126 SET(t->c_lflag, EXTPROC); 1127 else 1128 CLR(t->c_lflag, EXTPROC); 1129 tp->t_lflag = t->c_lflag | ISSET(tp->t_lflag, PENDIN); 1130 if (t->c_cc[VMIN] != tp->t_cc[VMIN] || 1131 t->c_cc[VTIME] != tp->t_cc[VTIME]) 1132 ttwakeup(tp); 1133 bcopy(t->c_cc, tp->t_cc, sizeof(t->c_cc)); 1134 splx(s); 1135 break; 1136 } 1137 case TIOCSETD: { /* set line discipline */ 1138 int t = *(int *)data; 1139 1140 if ((u_int)t >= nlinesw) 1141 return (ENXIO); 1142 if (t == tp->t_line) 1143 return (0); 1144 s = spltty(); 1145 ttyld_close(tp, flag); 1146 tp->t_line = t; 1147 /* XXX: we should use the correct cdev here */ 1148 error = ttyld_open(tp, tp->t_dev); 1149 if (error) { 1150 /* 1151 * If we fail to switch line discipline we cannot 1152 * fall back to the previous, because we can not 1153 * trust that ldisc to open successfully either. 1154 * Fall back to the default ldisc which we know 1155 * will allways succeed. 1156 */ 1157 tp->t_line = TTYDISC; 1158 (void)ttyld_open(tp, tp->t_dev); 1159 } 1160 splx(s); 1161 return (error); 1162 break; 1163 } 1164 case TIOCSTART: /* start output, like ^Q */ 1165 s = spltty(); 1166 if (ISSET(tp->t_state, TS_TTSTOP) || 1167 ISSET(tp->t_lflag, FLUSHO)) { 1168 CLR(tp->t_lflag, FLUSHO); 1169 CLR(tp->t_state, TS_TTSTOP); 1170 ttstart(tp); 1171 } 1172 splx(s); 1173 break; 1174 case TIOCSTI: /* simulate terminal input */ 1175 if ((flag & FREAD) == 0 && priv_check(td, PRIV_TTY_STI)) 1176 return (EPERM); 1177 if (!isctty(p, tp) && priv_check(td, PRIV_TTY_STI)) 1178 return (EACCES); 1179 s = spltty(); 1180 ttyld_rint(tp, *(u_char *)data); 1181 splx(s); 1182 break; 1183 case TIOCSTOP: /* stop output, like ^S */ 1184 s = spltty(); 1185 if (!ISSET(tp->t_state, TS_TTSTOP)) { 1186 SET(tp->t_state, TS_TTSTOP); 1187 tt_stop(tp, 0); 1188 } 1189 splx(s); 1190 break; 1191 case TIOCSCTTY: /* become controlling tty */ 1192 /* Session ctty vnode pointer set in vnode layer. */ 1193 sx_slock(&proctree_lock); 1194 if (!SESS_LEADER(p) || 1195 ((p->p_session->s_ttyvp || tp->t_session) && 1196 (tp->t_session != p->p_session))) { 1197 sx_sunlock(&proctree_lock); 1198 return (EPERM); 1199 } 1200 tp->t_session = p->p_session; 1201 tp->t_pgrp = p->p_pgrp; 1202 SESS_LOCK(p->p_session); 1203 ttyref(tp); /* ttyrel(): kern_proc.c:pgdelete() */ 1204 p->p_session->s_ttyp = tp; 1205 SESS_UNLOCK(p->p_session); 1206 PROC_LOCK(p); 1207 p->p_flag |= P_CONTROLT; 1208 PROC_UNLOCK(p); 1209 sx_sunlock(&proctree_lock); 1210 break; 1211 case TIOCSPGRP: { /* set pgrp of tty */ 1212 sx_slock(&proctree_lock); 1213 pgrp = pgfind(*(int *)data); 1214 if (!isctty(p, tp)) { 1215 if (pgrp != NULL) 1216 PGRP_UNLOCK(pgrp); 1217 sx_sunlock(&proctree_lock); 1218 return (ENOTTY); 1219 } 1220 if (pgrp == NULL) { 1221 sx_sunlock(&proctree_lock); 1222 return (EPERM); 1223 } 1224 PGRP_UNLOCK(pgrp); 1225 if (pgrp->pg_session != p->p_session) { 1226 sx_sunlock(&proctree_lock); 1227 return (EPERM); 1228 } 1229 sx_sunlock(&proctree_lock); 1230 tp->t_pgrp = pgrp; 1231 break; 1232 } 1233 case TIOCSTAT: /* simulate control-T */ 1234 s = spltty(); 1235 ttyinfo(tp); 1236 splx(s); 1237 break; 1238 case TIOCSWINSZ: /* set window size */ 1239 if (bcmp((caddr_t)&tp->t_winsize, data, 1240 sizeof (struct winsize))) { 1241 tp->t_winsize = *(struct winsize *)data; 1242 if (tp->t_pgrp != NULL) { 1243 PGRP_LOCK(tp->t_pgrp); 1244 pgsignal(tp->t_pgrp, SIGWINCH, 1); 1245 PGRP_UNLOCK(tp->t_pgrp); 1246 } 1247 } 1248 break; 1249 case TIOCSDRAINWAIT: 1250 error = priv_check(td, PRIV_TTY_DRAINWAIT); 1251 if (error) 1252 return (error); 1253 tp->t_timeout = *(int *)data * hz; 1254 wakeup(TSA_OCOMPLETE(tp)); 1255 wakeup(TSA_OLOWAT(tp)); 1256 break; 1257 case TIOCGDRAINWAIT: 1258 *(int *)data = tp->t_timeout / hz; 1259 break; 1260 case TIOCSBRK: 1261 return (tt_break(tp, 1)); 1262 case TIOCCBRK: 1263 return (tt_break(tp, 0)); 1264 default: 1265 #if defined(COMPAT_43TTY) 1266 return (ttcompat(tp, cmd, data, flag)); 1267 #else 1268 return (ENOIOCTL); 1269 #endif 1270 } 1271 return (0); 1272 } 1273 1274 int 1275 ttypoll(struct cdev *dev, int events, struct thread *td) 1276 { 1277 int s; 1278 int revents = 0; 1279 struct tty *tp; 1280 1281 tp = tty_gettp(dev); 1282 1283 if (tp == NULL) /* XXX used to return ENXIO, but that means true! */ 1284 return ((events & (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM)) 1285 | POLLHUP); 1286 1287 s = spltty(); 1288 if (events & (POLLIN | POLLRDNORM)) { 1289 if (ISSET(tp->t_state, TS_ZOMBIE)) 1290 revents |= (events & (POLLIN | POLLRDNORM)) | 1291 POLLHUP; 1292 else if (ttnread(tp) > 0) 1293 revents |= events & (POLLIN | POLLRDNORM); 1294 else 1295 selrecord(td, &tp->t_rsel); 1296 } 1297 if (events & POLLOUT) { 1298 if (ISSET(tp->t_state, TS_ZOMBIE)) 1299 revents |= POLLHUP; 1300 else if (tp->t_outq.c_cc <= tp->t_olowat && 1301 ISSET(tp->t_state, TS_CONNECTED)) 1302 revents |= events & POLLOUT; 1303 else 1304 selrecord(td, &tp->t_wsel); 1305 } 1306 splx(s); 1307 return (revents); 1308 } 1309 1310 static struct filterops ttyread_filtops = 1311 { 1, NULL, filt_ttyrdetach, filt_ttyread }; 1312 static struct filterops ttywrite_filtops = 1313 { 1, NULL, filt_ttywdetach, filt_ttywrite }; 1314 1315 int 1316 ttykqfilter(struct cdev *dev, struct knote *kn) 1317 { 1318 struct tty *tp; 1319 struct knlist *klist; 1320 int s; 1321 1322 tp = tty_gettp(dev); 1323 if (tp == NULL || (tp->t_state & TS_GONE)) 1324 return (ENODEV); 1325 1326 switch (kn->kn_filter) { 1327 case EVFILT_READ: 1328 klist = &tp->t_rsel.si_note; 1329 kn->kn_fop = &ttyread_filtops; 1330 break; 1331 case EVFILT_WRITE: 1332 klist = &tp->t_wsel.si_note; 1333 kn->kn_fop = &ttywrite_filtops; 1334 break; 1335 default: 1336 return (EINVAL); 1337 } 1338 1339 kn->kn_hook = (caddr_t)tp; 1340 1341 s = spltty(); 1342 knlist_add(klist, kn, 0); 1343 splx(s); 1344 1345 return (0); 1346 } 1347 1348 static void 1349 filt_ttyrdetach(struct knote *kn) 1350 { 1351 struct tty *tp = (struct tty *)kn->kn_hook; 1352 int s = spltty(); 1353 1354 knlist_remove(&tp->t_rsel.si_note, kn, 0); 1355 splx(s); 1356 } 1357 1358 static int 1359 filt_ttyread(struct knote *kn, long hint) 1360 { 1361 struct tty *tp = (struct tty *)kn->kn_hook; 1362 1363 kn->kn_data = ttnread(tp); 1364 if ((tp->t_state & TS_GONE) || ISSET(tp->t_state, TS_ZOMBIE)) { 1365 kn->kn_flags |= EV_EOF; 1366 return (1); 1367 } 1368 return (kn->kn_data > 0); 1369 } 1370 1371 static void 1372 filt_ttywdetach(struct knote *kn) 1373 { 1374 struct tty *tp = (struct tty *)kn->kn_hook; 1375 int s = spltty(); 1376 1377 knlist_remove(&tp->t_wsel.si_note, kn, 0); 1378 splx(s); 1379 } 1380 1381 static int 1382 filt_ttywrite(struct knote *kn, long hint) 1383 { 1384 struct tty *tp = (struct tty *)kn->kn_hook; 1385 1386 kn->kn_data = tp->t_outq.c_cc; 1387 if ((tp->t_state & TS_GONE) || ISSET(tp->t_state, TS_ZOMBIE)) 1388 return (1); 1389 return (kn->kn_data <= tp->t_olowat && 1390 ISSET(tp->t_state, TS_CONNECTED)); 1391 } 1392 1393 /* 1394 * Must be called at spltty(). 1395 */ 1396 static int 1397 ttnread(struct tty *tp) 1398 { 1399 int nread; 1400 1401 if (ISSET(tp->t_lflag, PENDIN)) 1402 ttypend(tp); 1403 nread = tp->t_canq.c_cc; 1404 if (!ISSET(tp->t_lflag, ICANON)) { 1405 nread += tp->t_rawq.c_cc; 1406 if (nread < tp->t_cc[VMIN] && tp->t_cc[VTIME] == 0) 1407 nread = 0; 1408 } 1409 return (nread); 1410 } 1411 1412 /* 1413 * Wait for output to drain. 1414 */ 1415 int 1416 ttywait(struct tty *tp) 1417 { 1418 int error, s; 1419 1420 error = 0; 1421 s = spltty(); 1422 while ((tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY)) && 1423 ISSET(tp->t_state, TS_CONNECTED) && tp->t_oproc) { 1424 tt_oproc(tp); 1425 if ((tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY)) && 1426 ISSET(tp->t_state, TS_CONNECTED)) { 1427 SET(tp->t_state, TS_SO_OCOMPLETE); 1428 error = ttysleep(tp, TSA_OCOMPLETE(tp), 1429 TTOPRI | PCATCH, "ttywai", 1430 tp->t_timeout); 1431 if (error) { 1432 if (error == EWOULDBLOCK) 1433 error = EIO; 1434 break; 1435 } 1436 } else 1437 break; 1438 } 1439 if (!error && (tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY))) 1440 error = EIO; 1441 splx(s); 1442 return (error); 1443 } 1444 1445 /* 1446 * Flush if successfully wait. 1447 */ 1448 static int 1449 ttywflush(struct tty *tp) 1450 { 1451 int error; 1452 1453 if ((error = ttywait(tp)) == 0) 1454 ttyflush(tp, FREAD); 1455 return (error); 1456 } 1457 1458 /* 1459 * Flush tty read and/or write queues, notifying anyone waiting. 1460 */ 1461 void 1462 ttyflush(struct tty *tp, int rw) 1463 { 1464 int s; 1465 1466 s = spltty(); 1467 #if 0 1468 again: 1469 #endif 1470 if (rw & FWRITE) { 1471 FLUSHQ(&tp->t_outq); 1472 CLR(tp->t_state, TS_TTSTOP); 1473 } 1474 tt_stop(tp, rw); 1475 if (rw & FREAD) { 1476 FLUSHQ(&tp->t_canq); 1477 FLUSHQ(&tp->t_rawq); 1478 CLR(tp->t_lflag, PENDIN); 1479 tp->t_rocount = 0; 1480 tp->t_rocol = 0; 1481 CLR(tp->t_state, TS_LOCAL); 1482 ttwakeup(tp); 1483 if (ISSET(tp->t_state, TS_TBLOCK)) { 1484 if (rw & FWRITE) 1485 FLUSHQ(&tp->t_outq); 1486 ttyunblock(tp); 1487 1488 /* 1489 * Don't let leave any state that might clobber the 1490 * next line discipline (although we should do more 1491 * to send the START char). Not clearing the state 1492 * may have caused the "putc to a clist with no 1493 * reserved cblocks" panic/printf. 1494 */ 1495 CLR(tp->t_state, TS_TBLOCK); 1496 1497 #if 0 /* forget it, sleeping isn't always safe and we don't know when it is */ 1498 if (ISSET(tp->t_iflag, IXOFF)) { 1499 /* 1500 * XXX wait a bit in the hope that the stop 1501 * character (if any) will go out. Waiting 1502 * isn't good since it allows races. This 1503 * will be fixed when the stop character is 1504 * put in a special queue. Don't bother with 1505 * the checks in ttywait() since the timeout 1506 * will save us. 1507 */ 1508 SET(tp->t_state, TS_SO_OCOMPLETE); 1509 ttysleep(tp, TSA_OCOMPLETE(tp), TTOPRI, 1510 "ttyfls", hz / 10); 1511 /* 1512 * Don't try sending the stop character again. 1513 */ 1514 CLR(tp->t_state, TS_TBLOCK); 1515 goto again; 1516 } 1517 #endif 1518 } 1519 } 1520 if (rw & FWRITE) { 1521 FLUSHQ(&tp->t_outq); 1522 ttwwakeup(tp); 1523 } 1524 splx(s); 1525 } 1526 1527 /* 1528 * Copy in the default termios characters. 1529 */ 1530 void 1531 termioschars(struct termios *t) 1532 { 1533 1534 bcopy(ttydefchars, t->c_cc, sizeof t->c_cc); 1535 } 1536 1537 /* 1538 * Old interface. 1539 */ 1540 void 1541 ttychars(struct tty *tp) 1542 { 1543 1544 termioschars(&tp->t_termios); 1545 } 1546 1547 /* 1548 * Handle input high water. Send stop character for the IXOFF case. Turn 1549 * on our input flow control bit and propagate the changes to the driver. 1550 * XXX the stop character should be put in a special high priority queue. 1551 */ 1552 void 1553 ttyblock(struct tty *tp) 1554 { 1555 1556 SET(tp->t_state, TS_TBLOCK); 1557 if (ISSET(tp->t_iflag, IXOFF) && tp->t_cc[VSTOP] != _POSIX_VDISABLE && 1558 putc(tp->t_cc[VSTOP], &tp->t_outq) != 0) 1559 CLR(tp->t_state, TS_TBLOCK); /* try again later */ 1560 ttstart(tp); 1561 } 1562 1563 /* 1564 * Handle input low water. Send start character for the IXOFF case. Turn 1565 * off our input flow control bit and propagate the changes to the driver. 1566 * XXX the start character should be put in a special high priority queue. 1567 */ 1568 static void 1569 ttyunblock(struct tty *tp) 1570 { 1571 1572 CLR(tp->t_state, TS_TBLOCK); 1573 if (ISSET(tp->t_iflag, IXOFF) && tp->t_cc[VSTART] != _POSIX_VDISABLE && 1574 putc(tp->t_cc[VSTART], &tp->t_outq) != 0) 1575 SET(tp->t_state, TS_TBLOCK); /* try again later */ 1576 ttstart(tp); 1577 } 1578 1579 #ifdef notyet 1580 /* Not used by any current (i386) drivers. */ 1581 /* 1582 * Restart after an inter-char delay. 1583 */ 1584 void 1585 ttrstrt(void *tp_arg) 1586 { 1587 struct tty *tp; 1588 int s; 1589 1590 KASSERT(tp_arg != NULL, ("ttrstrt")); 1591 1592 tp = tp_arg; 1593 s = spltty(); 1594 1595 CLR(tp->t_state, TS_TIMEOUT); 1596 ttstart(tp); 1597 1598 splx(s); 1599 } 1600 #endif 1601 1602 int 1603 ttstart(struct tty *tp) 1604 { 1605 1606 tt_oproc(tp); 1607 return (0); 1608 } 1609 1610 /* 1611 * "close" a line discipline 1612 */ 1613 int 1614 ttylclose(struct tty *tp, int flag) 1615 { 1616 1617 if (flag & FNONBLOCK || ttywflush(tp)) 1618 ttyflush(tp, FREAD | FWRITE); 1619 return (0); 1620 } 1621 1622 /* 1623 * Handle modem control transition on a tty. 1624 * Flag indicates new state of carrier. 1625 * Returns 0 if the line should be turned off, otherwise 1. 1626 */ 1627 int 1628 ttymodem(struct tty *tp, int flag) 1629 { 1630 1631 if (ISSET(tp->t_state, TS_CARR_ON) && ISSET(tp->t_cflag, MDMBUF)) { 1632 /* 1633 * MDMBUF: do flow control according to carrier flag 1634 * XXX TS_CAR_OFLOW doesn't do anything yet. TS_TTSTOP 1635 * works if IXON and IXANY are clear. 1636 */ 1637 if (flag) { 1638 CLR(tp->t_state, TS_CAR_OFLOW); 1639 CLR(tp->t_state, TS_TTSTOP); 1640 ttstart(tp); 1641 } else if (!ISSET(tp->t_state, TS_CAR_OFLOW)) { 1642 SET(tp->t_state, TS_CAR_OFLOW); 1643 SET(tp->t_state, TS_TTSTOP); 1644 tt_stop(tp, 0); 1645 } 1646 } else if (flag == 0) { 1647 /* 1648 * Lost carrier. 1649 */ 1650 CLR(tp->t_state, TS_CARR_ON); 1651 if (ISSET(tp->t_state, TS_ISOPEN) && 1652 !ISSET(tp->t_cflag, CLOCAL)) { 1653 SET(tp->t_state, TS_ZOMBIE); 1654 CLR(tp->t_state, TS_CONNECTED); 1655 if (tp->t_session) { 1656 sx_slock(&proctree_lock); 1657 if (tp->t_session && tp->t_session->s_leader) { 1658 struct proc *p; 1659 1660 p = tp->t_session->s_leader; 1661 PROC_LOCK(p); 1662 psignal(p, SIGHUP); 1663 PROC_UNLOCK(p); 1664 } 1665 sx_sunlock(&proctree_lock); 1666 } 1667 ttyflush(tp, FREAD | FWRITE); 1668 return (0); 1669 } 1670 } else { 1671 /* 1672 * Carrier now on. 1673 */ 1674 SET(tp->t_state, TS_CARR_ON); 1675 if (!ISSET(tp->t_state, TS_ZOMBIE)) 1676 SET(tp->t_state, TS_CONNECTED); 1677 wakeup(TSA_CARR_ON(tp)); 1678 ttwakeup(tp); 1679 ttwwakeup(tp); 1680 } 1681 return (1); 1682 } 1683 1684 /* 1685 * Reinput pending characters after state switch 1686 * call at spltty(). 1687 */ 1688 static void 1689 ttypend(struct tty *tp) 1690 { 1691 struct clist tq; 1692 int c; 1693 1694 CLR(tp->t_lflag, PENDIN); 1695 SET(tp->t_state, TS_TYPEN); 1696 /* 1697 * XXX this assumes too much about clist internals. It may even 1698 * fail if the cblock slush pool is empty. We can't allocate more 1699 * cblocks here because we are called from an interrupt handler 1700 * and clist_alloc_cblocks() can wait. 1701 */ 1702 tq = tp->t_rawq; 1703 bzero(&tp->t_rawq, sizeof tp->t_rawq); 1704 tp->t_rawq.c_cbmax = tq.c_cbmax; 1705 tp->t_rawq.c_cbreserved = tq.c_cbreserved; 1706 while ((c = getc(&tq)) >= 0) 1707 ttyinput(c, tp); 1708 CLR(tp->t_state, TS_TYPEN); 1709 } 1710 1711 /* 1712 * Process a read call on a tty device. 1713 */ 1714 int 1715 ttread(struct tty *tp, struct uio *uio, int flag) 1716 { 1717 struct clist *qp; 1718 int c; 1719 tcflag_t lflag; 1720 cc_t *cc = tp->t_cc; 1721 struct thread *td; 1722 struct proc *p; 1723 int s, first, error = 0; 1724 int has_stime = 0, last_cc = 0; 1725 long slp = 0; /* XXX this should be renamed `timo'. */ 1726 struct timeval stime = { 0, 0 }; 1727 struct pgrp *pg; 1728 1729 td = curthread; 1730 p = td->td_proc; 1731 loop: 1732 s = spltty(); 1733 lflag = tp->t_lflag; 1734 /* 1735 * take pending input first 1736 */ 1737 if (ISSET(lflag, PENDIN)) { 1738 ttypend(tp); 1739 splx(s); /* reduce latency */ 1740 s = spltty(); 1741 lflag = tp->t_lflag; /* XXX ttypend() clobbers it */ 1742 } 1743 1744 /* 1745 * Hang process if it's in the background. 1746 */ 1747 if (isbackground(p, tp)) { 1748 splx(s); 1749 sx_slock(&proctree_lock); 1750 PROC_LOCK(p); 1751 if (SIGISMEMBER(p->p_sigacts->ps_sigignore, SIGTTIN) || 1752 SIGISMEMBER(td->td_sigmask, SIGTTIN) || 1753 (p->p_flag & P_PPWAIT) || p->p_pgrp->pg_jobc == 0) { 1754 PROC_UNLOCK(p); 1755 sx_sunlock(&proctree_lock); 1756 return (EIO); 1757 } 1758 pg = p->p_pgrp; 1759 PROC_UNLOCK(p); 1760 PGRP_LOCK(pg); 1761 sx_sunlock(&proctree_lock); 1762 pgsignal(pg, SIGTTIN, 1); 1763 PGRP_UNLOCK(pg); 1764 error = ttysleep(tp, &lbolt, TTIPRI | PCATCH, "ttybg2", 0); 1765 if (error) 1766 return (error); 1767 goto loop; 1768 } 1769 1770 if (ISSET(tp->t_state, TS_ZOMBIE)) { 1771 splx(s); 1772 return (0); /* EOF */ 1773 } 1774 1775 /* 1776 * If canonical, use the canonical queue, 1777 * else use the raw queue. 1778 * 1779 * (should get rid of clists...) 1780 */ 1781 qp = ISSET(lflag, ICANON) ? &tp->t_canq : &tp->t_rawq; 1782 1783 if (flag & IO_NDELAY) { 1784 if (qp->c_cc > 0) 1785 goto read; 1786 if (!ISSET(lflag, ICANON) && cc[VMIN] == 0) { 1787 splx(s); 1788 return (0); 1789 } 1790 splx(s); 1791 return (EWOULDBLOCK); 1792 } 1793 if (!ISSET(lflag, ICANON)) { 1794 int m = cc[VMIN]; 1795 long t = cc[VTIME]; 1796 struct timeval timecopy; 1797 1798 /* 1799 * Check each of the four combinations. 1800 * (m > 0 && t == 0) is the normal read case. 1801 * It should be fairly efficient, so we check that and its 1802 * companion case (m == 0 && t == 0) first. 1803 * For the other two cases, we compute the target sleep time 1804 * into slp. 1805 */ 1806 if (t == 0) { 1807 if (qp->c_cc < m) 1808 goto sleep; 1809 if (qp->c_cc > 0) 1810 goto read; 1811 1812 /* m, t and qp->c_cc are all 0. 0 is enough input. */ 1813 splx(s); 1814 return (0); 1815 } 1816 t *= 100000; /* time in us */ 1817 #define diff(t1, t2) (((t1).tv_sec - (t2).tv_sec) * 1000000 + \ 1818 ((t1).tv_usec - (t2).tv_usec)) 1819 if (m > 0) { 1820 if (qp->c_cc <= 0) 1821 goto sleep; 1822 if (qp->c_cc >= m) 1823 goto read; 1824 getmicrotime(&timecopy); 1825 if (!has_stime) { 1826 /* first character, start timer */ 1827 has_stime = 1; 1828 stime = timecopy; 1829 slp = t; 1830 } else if (qp->c_cc > last_cc) { 1831 /* got a character, restart timer */ 1832 stime = timecopy; 1833 slp = t; 1834 } else { 1835 /* nothing, check expiration */ 1836 slp = t - diff(timecopy, stime); 1837 if (slp <= 0) 1838 goto read; 1839 } 1840 last_cc = qp->c_cc; 1841 } else { /* m == 0 */ 1842 if (qp->c_cc > 0) 1843 goto read; 1844 getmicrotime(&timecopy); 1845 if (!has_stime) { 1846 has_stime = 1; 1847 stime = timecopy; 1848 slp = t; 1849 } else { 1850 slp = t - diff(timecopy, stime); 1851 if (slp <= 0) { 1852 /* Timed out, but 0 is enough input. */ 1853 splx(s); 1854 return (0); 1855 } 1856 } 1857 } 1858 #undef diff 1859 if (slp != 0) { 1860 struct timeval tv; /* XXX style bug. */ 1861 1862 tv.tv_sec = slp / 1000000; 1863 tv.tv_usec = slp % 1000000; 1864 slp = tvtohz(&tv); 1865 /* 1866 * XXX bad variable names. slp was the timeout in 1867 * usec. Now it is the timeout in ticks. 1868 */ 1869 } 1870 goto sleep; 1871 } 1872 if (qp->c_cc <= 0) { 1873 sleep: 1874 /* 1875 * There is no input, or not enough input and we can block. 1876 */ 1877 error = ttysleep(tp, TSA_HUP_OR_INPUT(tp), TTIPRI | PCATCH, 1878 ISSET(tp->t_state, TS_CONNECTED) ? 1879 "ttyin" : "ttyhup", (int)slp); 1880 splx(s); 1881 if (error == EWOULDBLOCK) 1882 error = 0; 1883 else if (error) 1884 return (error); 1885 /* 1886 * XXX what happens if another process eats some input 1887 * while we are asleep (not just here)? It would be 1888 * safest to detect changes and reset our state variables 1889 * (has_stime and last_cc). 1890 */ 1891 slp = 0; 1892 goto loop; 1893 } 1894 read: 1895 splx(s); 1896 /* 1897 * Input present, check for input mapping and processing. 1898 */ 1899 first = 1; 1900 if (ISSET(lflag, ICANON | ISIG)) 1901 goto slowcase; 1902 for (;;) { 1903 char ibuf[IBUFSIZ]; 1904 int icc; 1905 1906 icc = imin(uio->uio_resid, IBUFSIZ); 1907 icc = q_to_b(qp, ibuf, icc); 1908 if (icc <= 0) { 1909 if (first) 1910 goto loop; 1911 break; 1912 } 1913 error = uiomove(ibuf, icc, uio); 1914 /* 1915 * XXX if there was an error then we should ungetc() the 1916 * unmoved chars and reduce icc here. 1917 */ 1918 if (error) 1919 break; 1920 if (uio->uio_resid == 0) 1921 break; 1922 first = 0; 1923 } 1924 goto out; 1925 slowcase: 1926 for (;;) { 1927 c = getc(qp); 1928 if (c < 0) { 1929 if (first) 1930 goto loop; 1931 break; 1932 } 1933 /* 1934 * delayed suspend (^Y) 1935 */ 1936 if (CCEQ(cc[VDSUSP], c) && 1937 ISSET(lflag, IEXTEN | ISIG) == (IEXTEN | ISIG)) { 1938 if (tp->t_pgrp != NULL) { 1939 PGRP_LOCK(tp->t_pgrp); 1940 pgsignal(tp->t_pgrp, SIGTSTP, 1); 1941 PGRP_UNLOCK(tp->t_pgrp); 1942 } 1943 if (first) { 1944 error = ttysleep(tp, &lbolt, TTIPRI | PCATCH, 1945 "ttybg3", 0); 1946 if (error) 1947 break; 1948 goto loop; 1949 } 1950 break; 1951 } 1952 /* 1953 * Interpret EOF only in canonical mode. 1954 */ 1955 if (CCEQ(cc[VEOF], c) && ISSET(lflag, ICANON)) 1956 break; 1957 /* 1958 * Give user character. 1959 */ 1960 error = ureadc(c, uio); 1961 if (error) 1962 /* XXX should ungetc(c, qp). */ 1963 break; 1964 if (uio->uio_resid == 0) 1965 break; 1966 /* 1967 * In canonical mode check for a "break character" 1968 * marking the end of a "line of input". 1969 */ 1970 if (ISSET(lflag, ICANON) && TTBREAKC(c, lflag)) 1971 break; 1972 first = 0; 1973 } 1974 1975 out: 1976 /* 1977 * Look to unblock input now that (presumably) 1978 * the input queue has gone down. 1979 */ 1980 s = spltty(); 1981 if (ISSET(tp->t_state, TS_TBLOCK) && 1982 tp->t_rawq.c_cc + tp->t_canq.c_cc <= tp->t_ilowat) 1983 ttyunblock(tp); 1984 splx(s); 1985 1986 return (error); 1987 } 1988 1989 /* 1990 * Check the output queue on tp for space for a kernel message (from uprintf 1991 * or tprintf). Allow some space over the normal hiwater mark so we don't 1992 * lose messages due to normal flow control, but don't let the tty run amok. 1993 * Sleeps here are not interruptible, but we return prematurely if new signals 1994 * arrive. 1995 */ 1996 int 1997 ttycheckoutq(struct tty *tp, int wait) 1998 { 1999 int hiwat, s; 2000 sigset_t oldmask; 2001 struct thread *td; 2002 struct proc *p; 2003 2004 td = curthread; 2005 p = td->td_proc; 2006 hiwat = tp->t_ohiwat; 2007 SIGEMPTYSET(oldmask); 2008 s = spltty(); 2009 if (wait) { 2010 PROC_LOCK(p); 2011 oldmask = td->td_siglist; 2012 PROC_UNLOCK(p); 2013 } 2014 if (tp->t_outq.c_cc > hiwat + OBUFSIZ + 100) 2015 while (tp->t_outq.c_cc > hiwat) { 2016 ttstart(tp); 2017 if (tp->t_outq.c_cc <= hiwat) 2018 break; 2019 if (!wait) { 2020 splx(s); 2021 return (0); 2022 } 2023 PROC_LOCK(p); 2024 if (!SIGSETEQ(td->td_siglist, oldmask)) { 2025 PROC_UNLOCK(p); 2026 splx(s); 2027 return (0); 2028 } 2029 PROC_UNLOCK(p); 2030 SET(tp->t_state, TS_SO_OLOWAT); 2031 tsleep(TSA_OLOWAT(tp), PZERO - 1, "ttoutq", hz); 2032 } 2033 splx(s); 2034 return (1); 2035 } 2036 2037 /* 2038 * Process a write call on a tty device. 2039 */ 2040 int 2041 ttwrite(struct tty *tp, struct uio *uio, int flag) 2042 { 2043 char *cp = NULL; 2044 int cc, ce; 2045 struct thread *td; 2046 struct proc *p; 2047 int i, hiwat, cnt, error, s; 2048 char obuf[OBUFSIZ]; 2049 2050 hiwat = tp->t_ohiwat; 2051 cnt = uio->uio_resid; 2052 error = 0; 2053 cc = 0; 2054 td = curthread; 2055 p = td->td_proc; 2056 loop: 2057 s = spltty(); 2058 if (ISSET(tp->t_state, TS_ZOMBIE)) { 2059 splx(s); 2060 if (uio->uio_resid == cnt) 2061 error = EIO; 2062 goto out; 2063 } 2064 if (!ISSET(tp->t_state, TS_CONNECTED)) { 2065 if (flag & IO_NDELAY) { 2066 splx(s); 2067 error = EWOULDBLOCK; 2068 goto out; 2069 } 2070 error = ttysleep(tp, TSA_CARR_ON(tp), TTIPRI | PCATCH, 2071 "ttywdcd", 0); 2072 splx(s); 2073 if (error) 2074 goto out; 2075 goto loop; 2076 } 2077 splx(s); 2078 /* 2079 * Hang the process if it's in the background. 2080 */ 2081 sx_slock(&proctree_lock); 2082 PROC_LOCK(p); 2083 if (isbackground(p, tp) && 2084 ISSET(tp->t_lflag, TOSTOP) && !(p->p_flag & P_PPWAIT) && 2085 !SIGISMEMBER(p->p_sigacts->ps_sigignore, SIGTTOU) && 2086 !SIGISMEMBER(td->td_sigmask, SIGTTOU)) { 2087 if (p->p_pgrp->pg_jobc == 0) { 2088 PROC_UNLOCK(p); 2089 sx_sunlock(&proctree_lock); 2090 error = EIO; 2091 goto out; 2092 } 2093 PROC_UNLOCK(p); 2094 PGRP_LOCK(p->p_pgrp); 2095 sx_sunlock(&proctree_lock); 2096 pgsignal(p->p_pgrp, SIGTTOU, 1); 2097 PGRP_UNLOCK(p->p_pgrp); 2098 error = ttysleep(tp, &lbolt, TTIPRI | PCATCH, "ttybg4", 0); 2099 if (error) 2100 goto out; 2101 goto loop; 2102 } else { 2103 PROC_UNLOCK(p); 2104 sx_sunlock(&proctree_lock); 2105 } 2106 /* 2107 * Process the user's data in at most OBUFSIZ chunks. Perform any 2108 * output translation. Keep track of high water mark, sleep on 2109 * overflow awaiting device aid in acquiring new space. 2110 */ 2111 while (uio->uio_resid > 0 || cc > 0) { 2112 if (ISSET(tp->t_lflag, FLUSHO)) { 2113 uio->uio_resid = 0; 2114 return (0); 2115 } 2116 if (tp->t_outq.c_cc > hiwat) 2117 goto ovhiwat; 2118 /* 2119 * Grab a hunk of data from the user, unless we have some 2120 * leftover from last time. 2121 */ 2122 if (cc == 0) { 2123 cc = imin(uio->uio_resid, OBUFSIZ); 2124 cp = obuf; 2125 error = uiomove(cp, cc, uio); 2126 if (error) { 2127 cc = 0; 2128 break; 2129 } 2130 } 2131 /* 2132 * If nothing fancy need be done, grab those characters we 2133 * can handle without any of ttyoutput's processing and 2134 * just transfer them to the output q. For those chars 2135 * which require special processing (as indicated by the 2136 * bits in char_type), call ttyoutput. After processing 2137 * a hunk of data, look for FLUSHO so ^O's will take effect 2138 * immediately. 2139 */ 2140 while (cc > 0) { 2141 if (!ISSET(tp->t_oflag, OPOST)) 2142 ce = cc; 2143 else { 2144 ce = cc - scanc((u_int)cc, (u_char *)cp, 2145 char_type, CCLASSMASK); 2146 /* 2147 * If ce is zero, then we're processing 2148 * a special character through ttyoutput. 2149 */ 2150 if (ce == 0) { 2151 tp->t_rocount = 0; 2152 if (ttyoutput(*cp, tp) >= 0) { 2153 /* No Clists, wait a bit. */ 2154 ttstart(tp); 2155 if (flag & IO_NDELAY) { 2156 error = EWOULDBLOCK; 2157 goto out; 2158 } 2159 error = ttysleep(tp, &lbolt, 2160 TTOPRI|PCATCH, 2161 "ttybf1", 0); 2162 if (error) 2163 goto out; 2164 goto loop; 2165 } 2166 cp++; 2167 cc--; 2168 if (ISSET(tp->t_lflag, FLUSHO) || 2169 tp->t_outq.c_cc > hiwat) 2170 goto ovhiwat; 2171 continue; 2172 } 2173 } 2174 /* 2175 * A bunch of normal characters have been found. 2176 * Transfer them en masse to the output queue and 2177 * continue processing at the top of the loop. 2178 * If there are any further characters in this 2179 * <= OBUFSIZ chunk, the first should be a character 2180 * requiring special handling by ttyoutput. 2181 */ 2182 tp->t_rocount = 0; 2183 i = b_to_q(cp, ce, &tp->t_outq); 2184 ce -= i; 2185 tp->t_column += ce; 2186 cp += ce, cc -= ce, tk_nout += ce; 2187 tp->t_outcc += ce; 2188 if (i > 0) { 2189 /* No Clists, wait a bit. */ 2190 ttstart(tp); 2191 if (flag & IO_NDELAY) { 2192 error = EWOULDBLOCK; 2193 goto out; 2194 } 2195 error = ttysleep(tp, &lbolt, TTOPRI | PCATCH, 2196 "ttybf2", 0); 2197 if (error) 2198 goto out; 2199 goto loop; 2200 } 2201 if (ISSET(tp->t_lflag, FLUSHO) || 2202 tp->t_outq.c_cc > hiwat) 2203 break; 2204 } 2205 ttstart(tp); 2206 } 2207 out: 2208 /* 2209 * If cc is nonzero, we leave the uio structure inconsistent, as the 2210 * offset and iov pointers have moved forward, but it doesn't matter 2211 * (the call will either return short or restart with a new uio). 2212 */ 2213 uio->uio_resid += cc; 2214 return (error); 2215 2216 ovhiwat: 2217 ttstart(tp); 2218 s = spltty(); 2219 /* 2220 * This can only occur if FLUSHO is set in t_lflag, 2221 * or if ttstart/oproc is synchronous (or very fast). 2222 */ 2223 if (tp->t_outq.c_cc <= hiwat) { 2224 splx(s); 2225 goto loop; 2226 } 2227 if (flag & IO_NDELAY) { 2228 splx(s); 2229 uio->uio_resid += cc; 2230 return (uio->uio_resid == cnt ? EWOULDBLOCK : 0); 2231 } 2232 SET(tp->t_state, TS_SO_OLOWAT); 2233 error = ttysleep(tp, TSA_OLOWAT(tp), TTOPRI | PCATCH, "ttywri", 2234 tp->t_timeout); 2235 splx(s); 2236 if (error == EWOULDBLOCK) 2237 error = EIO; 2238 if (error) 2239 goto out; 2240 goto loop; 2241 } 2242 2243 /* 2244 * Rubout one character from the rawq of tp 2245 * as cleanly as possible. 2246 */ 2247 static void 2248 ttyrub(int c, struct tty *tp) 2249 { 2250 char *cp; 2251 int savecol; 2252 int tabc, s; 2253 2254 if (!ISSET(tp->t_lflag, ECHO) || ISSET(tp->t_lflag, EXTPROC)) 2255 return; 2256 CLR(tp->t_lflag, FLUSHO); 2257 if (ISSET(tp->t_lflag, ECHOE)) { 2258 if (tp->t_rocount == 0) { 2259 /* 2260 * Screwed by ttwrite; retype 2261 */ 2262 ttyretype(tp); 2263 return; 2264 } 2265 if (c == ('\t' | TTY_QUOTE) || c == ('\n' | TTY_QUOTE)) 2266 ttyrubo(tp, 2); 2267 else { 2268 CLR(c, ~TTY_CHARMASK); 2269 switch (CCLASS(c)) { 2270 case ORDINARY: 2271 ttyrubo(tp, 1); 2272 break; 2273 case BACKSPACE: 2274 case CONTROL: 2275 case NEWLINE: 2276 case RETURN: 2277 case VTAB: 2278 if (ISSET(tp->t_lflag, ECHOCTL)) 2279 ttyrubo(tp, 2); 2280 break; 2281 case TAB: 2282 if (tp->t_rocount < tp->t_rawq.c_cc) { 2283 ttyretype(tp); 2284 return; 2285 } 2286 s = spltty(); 2287 savecol = tp->t_column; 2288 SET(tp->t_state, TS_CNTTB); 2289 SET(tp->t_lflag, FLUSHO); 2290 tp->t_column = tp->t_rocol; 2291 cp = tp->t_rawq.c_cf; 2292 if (cp) 2293 tabc = *cp; /* XXX FIX NEXTC */ 2294 for (; cp; cp = nextc(&tp->t_rawq, cp, &tabc)) 2295 ttyecho(tabc, tp); 2296 CLR(tp->t_lflag, FLUSHO); 2297 CLR(tp->t_state, TS_CNTTB); 2298 splx(s); 2299 2300 /* savecol will now be length of the tab. */ 2301 savecol -= tp->t_column; 2302 tp->t_column += savecol; 2303 if (savecol > 8) 2304 savecol = 8; /* overflow screw */ 2305 while (--savecol >= 0) 2306 (void)ttyoutput('\b', tp); 2307 break; 2308 default: /* XXX */ 2309 #define PANICSTR "ttyrub: would panic c = %d, val = %d\n" 2310 (void)printf(PANICSTR, c, CCLASS(c)); 2311 #ifdef notdef 2312 panic(PANICSTR, c, CCLASS(c)); 2313 #endif 2314 } 2315 } 2316 } else if (ISSET(tp->t_lflag, ECHOPRT)) { 2317 if (!ISSET(tp->t_state, TS_ERASE)) { 2318 SET(tp->t_state, TS_ERASE); 2319 (void)ttyoutput('\\', tp); 2320 } 2321 ttyecho(c, tp); 2322 } else { 2323 ttyecho(tp->t_cc[VERASE], tp); 2324 /* 2325 * This code may be executed not only when an ERASE key 2326 * is pressed, but also when ^U (KILL) or ^W (WERASE) are. 2327 * So, I didn't think it was worthwhile to pass the extra 2328 * information (which would need an extra parameter, 2329 * changing every call) needed to distinguish the ERASE2 2330 * case from the ERASE. 2331 */ 2332 } 2333 --tp->t_rocount; 2334 } 2335 2336 /* 2337 * Back over cnt characters, erasing them. 2338 */ 2339 static void 2340 ttyrubo(struct tty *tp, int cnt) 2341 { 2342 2343 while (cnt-- > 0) { 2344 (void)ttyoutput('\b', tp); 2345 (void)ttyoutput(' ', tp); 2346 (void)ttyoutput('\b', tp); 2347 } 2348 } 2349 2350 /* 2351 * ttyretype -- 2352 * Reprint the rawq line. Note, it is assumed that c_cc has already 2353 * been checked. 2354 */ 2355 static void 2356 ttyretype(struct tty *tp) 2357 { 2358 char *cp; 2359 int s, c; 2360 2361 /* Echo the reprint character. */ 2362 if (tp->t_cc[VREPRINT] != _POSIX_VDISABLE) 2363 ttyecho(tp->t_cc[VREPRINT], tp); 2364 2365 (void)ttyoutput('\n', tp); 2366 2367 /* 2368 * XXX 2369 * FIX: NEXTC IS BROKEN - DOESN'T CHECK QUOTE 2370 * BIT OF FIRST CHAR. 2371 */ 2372 s = spltty(); 2373 for (cp = tp->t_canq.c_cf, c = (cp != NULL ? *cp : 0); 2374 cp != NULL; cp = nextc(&tp->t_canq, cp, &c)) 2375 ttyecho(c, tp); 2376 for (cp = tp->t_rawq.c_cf, c = (cp != NULL ? *cp : 0); 2377 cp != NULL; cp = nextc(&tp->t_rawq, cp, &c)) 2378 ttyecho(c, tp); 2379 CLR(tp->t_state, TS_ERASE); 2380 splx(s); 2381 2382 tp->t_rocount = tp->t_rawq.c_cc; 2383 tp->t_rocol = 0; 2384 } 2385 2386 /* 2387 * Echo a typed character to the terminal. 2388 */ 2389 static void 2390 ttyecho(int c, struct tty *tp) 2391 { 2392 2393 if (!ISSET(tp->t_state, TS_CNTTB)) 2394 CLR(tp->t_lflag, FLUSHO); 2395 if ((!ISSET(tp->t_lflag, ECHO) && 2396 (c != '\n' || !ISSET(tp->t_lflag, ECHONL))) || 2397 ISSET(tp->t_lflag, EXTPROC)) 2398 return; 2399 if (ISSET(tp->t_lflag, ECHOCTL) && 2400 ((ISSET(c, TTY_CHARMASK) <= 037 && c != '\t' && c != '\n') || 2401 ISSET(c, TTY_CHARMASK) == 0177)) { 2402 (void)ttyoutput('^', tp); 2403 CLR(c, ~TTY_CHARMASK); 2404 if (c == 0177) 2405 c = '?'; 2406 else 2407 c += 'A' - 1; 2408 } 2409 (void)ttyoutput(c, tp); 2410 } 2411 2412 /* 2413 * Wake up any readers on a tty. 2414 */ 2415 void 2416 ttwakeup(struct tty *tp) 2417 { 2418 2419 if (SEL_WAITING(&tp->t_rsel)) 2420 selwakeuppri(&tp->t_rsel, TTIPRI); 2421 if (ISSET(tp->t_state, TS_ASYNC) && tp->t_sigio != NULL) 2422 pgsigio(&tp->t_sigio, SIGIO, (tp->t_session != NULL)); 2423 wakeup(TSA_HUP_OR_INPUT(tp)); 2424 KNOTE_UNLOCKED(&tp->t_rsel.si_note, 0); 2425 } 2426 2427 /* 2428 * Wake up any writers on a tty. 2429 */ 2430 void 2431 ttwwakeup(struct tty *tp) 2432 { 2433 2434 if (SEL_WAITING(&tp->t_wsel) && tp->t_outq.c_cc <= tp->t_olowat) 2435 selwakeuppri(&tp->t_wsel, TTOPRI); 2436 if (ISSET(tp->t_state, TS_ASYNC) && tp->t_sigio != NULL) 2437 pgsigio(&tp->t_sigio, SIGIO, (tp->t_session != NULL)); 2438 if (ISSET(tp->t_state, TS_BUSY | TS_SO_OCOMPLETE) == 2439 TS_SO_OCOMPLETE && tp->t_outq.c_cc == 0) { 2440 CLR(tp->t_state, TS_SO_OCOMPLETE); 2441 wakeup(TSA_OCOMPLETE(tp)); 2442 } 2443 if (ISSET(tp->t_state, TS_SO_OLOWAT) && 2444 tp->t_outq.c_cc <= tp->t_olowat) { 2445 CLR(tp->t_state, TS_SO_OLOWAT); 2446 wakeup(TSA_OLOWAT(tp)); 2447 } 2448 KNOTE_UNLOCKED(&tp->t_wsel.si_note, 0); 2449 } 2450 2451 /* 2452 * Look up a code for a specified speed in a conversion table; 2453 * used by drivers to map software speed values to hardware parameters. 2454 */ 2455 int 2456 ttspeedtab(int speed, struct speedtab *table) 2457 { 2458 2459 for ( ; table->sp_speed != -1; table++) 2460 if (table->sp_speed == speed) 2461 return (table->sp_code); 2462 return (-1); 2463 } 2464 2465 /* 2466 * Set input and output watermarks and buffer sizes. For input, the 2467 * high watermark is about one second's worth of input above empty, the 2468 * low watermark is slightly below high water, and the buffer size is a 2469 * driver-dependent amount above high water. For output, the watermarks 2470 * are near the ends of the buffer, with about 1 second's worth of input 2471 * between them. All this only applies to the standard line discipline. 2472 */ 2473 void 2474 ttsetwater(struct tty *tp) 2475 { 2476 int cps, ttmaxhiwat, x; 2477 2478 /* Input. */ 2479 clist_alloc_cblocks(&tp->t_canq, TTYHOG, 512); 2480 switch (tp->t_ispeedwat) { 2481 case (speed_t)-1: 2482 cps = tp->t_ispeed / 10; 2483 break; 2484 case 0: 2485 /* 2486 * This case is for old drivers that don't know about 2487 * t_ispeedwat. Arrange for them to get the old buffer 2488 * sizes and watermarks. 2489 */ 2490 cps = TTYHOG - 2 * 256; 2491 tp->t_ififosize = 2 * 256; 2492 break; 2493 default: 2494 cps = tp->t_ispeedwat / 10; 2495 break; 2496 } 2497 tp->t_ihiwat = cps; 2498 tp->t_ilowat = 7 * cps / 8; 2499 x = cps + tp->t_ififosize; 2500 clist_alloc_cblocks(&tp->t_rawq, x, x); 2501 2502 /* Output. */ 2503 switch (tp->t_ospeedwat) { 2504 case (speed_t)-1: 2505 cps = tp->t_ospeed / 10; 2506 ttmaxhiwat = 2 * TTMAXHIWAT; 2507 break; 2508 case 0: 2509 cps = tp->t_ospeed / 10; 2510 ttmaxhiwat = TTMAXHIWAT; 2511 break; 2512 default: 2513 cps = tp->t_ospeedwat / 10; 2514 ttmaxhiwat = 8 * TTMAXHIWAT; 2515 break; 2516 } 2517 #define CLAMP(x, h, l) ((x) > h ? h : ((x) < l) ? l : (x)) 2518 tp->t_olowat = x = CLAMP(cps / 2, TTMAXLOWAT, TTMINLOWAT); 2519 x += cps; 2520 x = CLAMP(x, ttmaxhiwat, TTMINHIWAT); /* XXX clamps are too magic */ 2521 tp->t_ohiwat = roundup(x, CBSIZE); /* XXX for compat */ 2522 x = imax(tp->t_ohiwat, TTMAXHIWAT); /* XXX for compat/safety */ 2523 x += OBUFSIZ + 100; 2524 clist_alloc_cblocks(&tp->t_outq, x, x); 2525 #undef CLAMP 2526 } 2527 2528 /* 2529 * Report on state of foreground process group. 2530 */ 2531 void 2532 ttyinfo(struct tty *tp) 2533 { 2534 struct timeval utime, stime; 2535 struct proc *p, *pick; 2536 struct thread *td, *picktd; 2537 const char *stateprefix, *state; 2538 long rss; 2539 int load, pctcpu; 2540 pid_t pid; 2541 char comm[MAXCOMLEN + 1]; 2542 struct rusage ru; 2543 2544 if (ttycheckoutq(tp,0) == 0) 2545 return; 2546 2547 /* Print load average. */ 2548 load = (averunnable.ldavg[0] * 100 + FSCALE / 2) >> FSHIFT; 2549 ttyprintf(tp, "load: %d.%02d ", load / 100, load % 100); 2550 2551 /* 2552 * On return following a ttyprintf(), we set tp->t_rocount to 0 so 2553 * that pending input will be retyped on BS. 2554 */ 2555 if (tp->t_session == NULL) { 2556 ttyprintf(tp, "not a controlling terminal\n"); 2557 tp->t_rocount = 0; 2558 return; 2559 } 2560 if (tp->t_pgrp == NULL) { 2561 ttyprintf(tp, "no foreground process group\n"); 2562 tp->t_rocount = 0; 2563 return; 2564 } 2565 PGRP_LOCK(tp->t_pgrp); 2566 if (LIST_EMPTY(&tp->t_pgrp->pg_members)) { 2567 PGRP_UNLOCK(tp->t_pgrp); 2568 ttyprintf(tp, "empty foreground process group\n"); 2569 tp->t_rocount = 0; 2570 return; 2571 } 2572 2573 /* 2574 * Pick the most interesting process and copy some of its 2575 * state for printing later. This operation could rely on stale 2576 * data as we can't hold the proc slock or thread locks over the 2577 * whole list. However, we're guaranteed not to reference an exited 2578 * thread or proc since we hold the tty locked. 2579 */ 2580 pick = NULL; 2581 LIST_FOREACH(p, &tp->t_pgrp->pg_members, p_pglist) 2582 if (proc_compare(pick, p)) 2583 pick = p; 2584 2585 PROC_SLOCK(pick); 2586 picktd = NULL; 2587 td = FIRST_THREAD_IN_PROC(pick); 2588 FOREACH_THREAD_IN_PROC(pick, td) 2589 if (thread_compare(picktd, td)) 2590 picktd = td; 2591 td = picktd; 2592 stateprefix = ""; 2593 thread_lock(td); 2594 if (TD_IS_RUNNING(td)) 2595 state = "running"; 2596 else if (TD_ON_RUNQ(td) || TD_CAN_RUN(td)) 2597 state = "runnable"; 2598 else if (TD_IS_SLEEPING(td)) { 2599 /* XXX: If we're sleeping, are we ever not in a queue? */ 2600 if (TD_ON_SLEEPQ(td)) 2601 state = td->td_wmesg; 2602 else 2603 state = "sleeping without queue"; 2604 } else if (TD_ON_LOCK(td)) { 2605 state = td->td_lockname; 2606 stateprefix = "*"; 2607 } else if (TD_IS_SUSPENDED(td)) 2608 state = "suspended"; 2609 else if (TD_AWAITING_INTR(td)) 2610 state = "intrwait"; 2611 else 2612 state = "unknown"; 2613 pctcpu = (sched_pctcpu(td) * 10000 + FSCALE / 2) >> FSHIFT; 2614 thread_unlock(td); 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 PROC_SUNLOCK(pick); 2620 PROC_LOCK(pick); 2621 PGRP_UNLOCK(tp->t_pgrp); 2622 rufetchcalc(pick, &ru, &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 2651 #define TESTAB(a, b) ((a)<<1 | (b)) 2652 #define ONLYA 2 2653 #define ONLYB 1 2654 #define BOTH 3 2655 2656 static int 2657 proc_sum(struct proc *p, int *estcpup) 2658 { 2659 struct thread *td; 2660 int estcpu; 2661 int val; 2662 2663 val = 0; 2664 estcpu = 0; 2665 FOREACH_THREAD_IN_PROC(p, td) { 2666 thread_lock(td); 2667 if (TD_ON_RUNQ(td) || 2668 TD_IS_RUNNING(td)) 2669 val = 1; 2670 estcpu += sched_pctcpu(td); 2671 thread_unlock(td); 2672 } 2673 *estcpup = estcpu; 2674 2675 return (val); 2676 } 2677 2678 static int 2679 thread_compare(struct thread *td, struct thread *td2) 2680 { 2681 int runa, runb; 2682 int slpa, slpb; 2683 fixpt_t esta, estb; 2684 2685 if (td == NULL) 2686 return (1); 2687 2688 /* 2689 * Fetch running stats, pctcpu usage, and interruptable flag. 2690 */ 2691 thread_lock(td); 2692 runa = TD_IS_RUNNING(td) | TD_ON_RUNQ(td); 2693 slpa = td->td_flags & TDF_SINTR; 2694 esta = sched_pctcpu(td); 2695 thread_unlock(td); 2696 thread_lock(td2); 2697 runb = TD_IS_RUNNING(td2) | TD_ON_RUNQ(td2); 2698 estb = sched_pctcpu(td2); 2699 slpb = td2->td_flags & TDF_SINTR; 2700 thread_unlock(td2); 2701 /* 2702 * see if at least one of them is runnable 2703 */ 2704 switch (TESTAB(runa, runb)) { 2705 case ONLYA: 2706 return (0); 2707 case ONLYB: 2708 return (1); 2709 case BOTH: 2710 break; 2711 } 2712 /* 2713 * favor one with highest recent cpu utilization 2714 */ 2715 if (estb > esta) 2716 return (1); 2717 if (esta > estb) 2718 return (0); 2719 /* 2720 * favor one sleeping in a non-interruptible sleep 2721 */ 2722 switch (TESTAB(slpa, slpb)) { 2723 case ONLYA: 2724 return (0); 2725 case ONLYB: 2726 return (1); 2727 case BOTH: 2728 break; 2729 } 2730 2731 return (td < td2); 2732 } 2733 2734 static int 2735 proc_compare(struct proc *p1, struct proc *p2) 2736 { 2737 2738 int runa, runb; 2739 fixpt_t esta, estb; 2740 2741 if (p1 == NULL) 2742 return (1); 2743 2744 /* 2745 * Fetch various stats about these processes. After we drop the 2746 * lock the information could be stale but the race is unimportant. 2747 */ 2748 PROC_SLOCK(p1); 2749 runa = proc_sum(p1, &esta); 2750 PROC_SUNLOCK(p1); 2751 PROC_SLOCK(p2); 2752 runb = proc_sum(p2, &estb); 2753 PROC_SUNLOCK(p2); 2754 2755 /* 2756 * see if at least one of them is runnable 2757 */ 2758 switch (TESTAB(runa, runb)) { 2759 case ONLYA: 2760 return (0); 2761 case ONLYB: 2762 return (1); 2763 case BOTH: 2764 break; 2765 } 2766 /* 2767 * favor one with highest recent cpu utilization 2768 */ 2769 if (estb > esta) 2770 return (1); 2771 if (esta > estb) 2772 return (0); 2773 /* 2774 * weed out zombies 2775 */ 2776 switch (TESTAB(p1->p_state == PRS_ZOMBIE, p2->p_state == PRS_ZOMBIE)) { 2777 case ONLYA: 2778 return (1); 2779 case ONLYB: 2780 return (0); 2781 case BOTH: 2782 break; 2783 } 2784 2785 return (p2->p_pid > p1->p_pid); /* tie - return highest pid */ 2786 } 2787 2788 /* 2789 * Output char to tty; console putchar style. 2790 */ 2791 int 2792 tputchar(int c, struct tty *tp) 2793 { 2794 int s; 2795 2796 s = spltty(); 2797 if (!ISSET(tp->t_state, TS_CONNECTED)) { 2798 splx(s); 2799 return (-1); 2800 } 2801 if (c == '\n') 2802 (void)ttyoutput('\r', tp); 2803 (void)ttyoutput(c, tp); 2804 ttstart(tp); 2805 splx(s); 2806 return (0); 2807 } 2808 2809 /* 2810 * Sleep on chan, returning ERESTART if tty changed while we napped and 2811 * returning any errors (e.g. EINTR/EWOULDBLOCK) reported by tsleep. If 2812 * the tty is revoked, restarting a pending call will redo validation done 2813 * at the start of the call. 2814 */ 2815 int 2816 ttysleep(struct tty *tp, void *chan, int pri, char *wmesg, int timo) 2817 { 2818 int error; 2819 int gen; 2820 2821 gen = tp->t_gen; 2822 error = tsleep(chan, pri, wmesg, timo); 2823 if (tp->t_state & TS_GONE) 2824 return (ENXIO); 2825 if (error) 2826 return (error); 2827 return (tp->t_gen == gen ? 0 : ERESTART); 2828 } 2829 2830 /* 2831 * Gain a reference to a TTY 2832 */ 2833 int 2834 ttyref(struct tty *tp) 2835 { 2836 int i; 2837 2838 mtx_lock(&tp->t_mtx); 2839 KASSERT(tp->t_refcnt > 0, 2840 ("ttyref(): tty refcnt is %d (%s)", 2841 tp->t_refcnt, tp->t_dev != NULL ? devtoname(tp->t_dev) : "??")); 2842 i = ++tp->t_refcnt; 2843 mtx_unlock(&tp->t_mtx); 2844 return (i); 2845 } 2846 2847 /* 2848 * Drop a reference to a TTY. 2849 * When reference count drops to zero, we free it. 2850 */ 2851 int 2852 ttyrel(struct tty *tp) 2853 { 2854 int i; 2855 2856 mtx_lock(&tty_list_mutex); 2857 mtx_lock(&tp->t_mtx); 2858 KASSERT(tp->t_refcnt > 0, 2859 ("ttyrel(): tty refcnt is %d (%s)", 2860 tp->t_refcnt, tp->t_dev != NULL ? devtoname(tp->t_dev) : "??")); 2861 i = --tp->t_refcnt; 2862 if (i != 0) { 2863 mtx_unlock(&tp->t_mtx); 2864 mtx_unlock(&tty_list_mutex); 2865 return (i); 2866 } 2867 TAILQ_REMOVE(&tty_list, tp, t_list); 2868 mtx_unlock(&tp->t_mtx); 2869 mtx_unlock(&tty_list_mutex); 2870 knlist_destroy(&tp->t_rsel.si_note); 2871 knlist_destroy(&tp->t_wsel.si_note); 2872 mtx_destroy(&tp->t_mtx); 2873 free(tp, M_TTYS); 2874 return (i); 2875 } 2876 2877 /* 2878 * Allocate a tty struct. Clists in the struct will be allocated by 2879 * tty_open(). 2880 */ 2881 struct tty * 2882 ttyalloc() 2883 { 2884 struct tty *tp; 2885 2886 tp = malloc(sizeof *tp, M_TTYS, M_WAITOK | M_ZERO); 2887 mtx_init(&tp->t_mtx, "tty", NULL, MTX_DEF); 2888 2889 /* 2890 * Set up the initial state 2891 */ 2892 tp->t_refcnt = 1; 2893 tp->t_timeout = -1; 2894 tp->t_dtr_wait = 3 * hz; 2895 2896 ttyinitmode(tp, 0, 0); 2897 bcopy(ttydefchars, tp->t_init_in.c_cc, sizeof tp->t_init_in.c_cc); 2898 2899 /* Make callout the same as callin */ 2900 tp->t_init_out = tp->t_init_in; 2901 2902 mtx_lock(&tty_list_mutex); 2903 TAILQ_INSERT_TAIL(&tty_list, tp, t_list); 2904 mtx_unlock(&tty_list_mutex); 2905 knlist_init(&tp->t_rsel.si_note, &tp->t_mtx, NULL, NULL, NULL); 2906 knlist_init(&tp->t_wsel.si_note, &tp->t_mtx, NULL, NULL, NULL); 2907 return (tp); 2908 } 2909 2910 static void 2911 ttypurge(struct cdev *dev) 2912 { 2913 2914 if (dev->si_tty == NULL) 2915 return; 2916 ttygone(dev->si_tty); 2917 } 2918 2919 /* 2920 * ttycreate() 2921 * 2922 * Create the device entries for this tty thereby opening it for business. 2923 * 2924 * The flags argument controls if "cua" units are created. 2925 * 2926 * The t_sc filed is copied to si_drv1 in the created cdevs. This 2927 * is particularly important for ->t_cioctl() users. 2928 * 2929 * XXX: implement the init and lock devices by cloning. 2930 */ 2931 2932 int 2933 ttycreate(struct tty *tp, int flags, const char *fmt, ...) 2934 { 2935 char namebuf[SPECNAMELEN - 3]; /* XXX space for "tty" */ 2936 struct cdevsw *csw = NULL; 2937 int unit = 0; 2938 va_list ap; 2939 struct cdev *cp; 2940 int i, minor, sminor, sunit; 2941 2942 mtx_assert(&Giant, MA_OWNED); 2943 2944 if (tty_unit == NULL) 2945 tty_unit = new_unrhdr(0, 0xffff, NULL); 2946 2947 sunit = alloc_unr(tty_unit); 2948 tp->t_devunit = sunit; 2949 2950 if (csw == NULL) { 2951 csw = &tty_cdevsw; 2952 unit = sunit; 2953 } 2954 KASSERT(csw->d_purge == NULL || csw->d_purge == ttypurge, 2955 ("tty should not have d_purge")); 2956 2957 csw->d_purge = ttypurge; 2958 2959 minor = unit2minor(unit); 2960 sminor = unit2minor(sunit); 2961 va_start(ap, fmt); 2962 i = vsnrprintf(namebuf, sizeof namebuf, 32, fmt, ap); 2963 va_end(ap); 2964 KASSERT(i < sizeof namebuf, ("Too long tty name (%s)", namebuf)); 2965 2966 cp = make_dev(csw, minor, 2967 UID_ROOT, GID_WHEEL, 0600, "tty%s", namebuf); 2968 tp->t_dev = cp; 2969 tp->t_mdev = cp; 2970 cp->si_tty = tp; 2971 cp->si_drv1 = tp->t_sc; 2972 2973 cp = make_dev(&ttys_cdevsw, sminor | MINOR_INIT, 2974 UID_ROOT, GID_WHEEL, 0600, "tty%s.init", namebuf); 2975 dev_depends(tp->t_dev, cp); 2976 cp->si_drv1 = tp->t_sc; 2977 cp->si_drv2 = &tp->t_init_in; 2978 cp->si_tty = tp; 2979 2980 cp = make_dev(&ttys_cdevsw, sminor | MINOR_LOCK, 2981 UID_ROOT, GID_WHEEL, 0600, "tty%s.lock", namebuf); 2982 dev_depends(tp->t_dev, cp); 2983 cp->si_drv1 = tp->t_sc; 2984 cp->si_drv2 = &tp->t_lock_in; 2985 cp->si_tty = tp; 2986 2987 if (flags & TS_CALLOUT) { 2988 cp = make_dev(csw, minor | MINOR_CALLOUT, 2989 UID_UUCP, GID_DIALER, 0660, "cua%s", namebuf); 2990 dev_depends(tp->t_dev, cp); 2991 cp->si_drv1 = tp->t_sc; 2992 cp->si_tty = tp; 2993 2994 cp = make_dev(&ttys_cdevsw, sminor | MINOR_CALLOUT | MINOR_INIT, 2995 UID_UUCP, GID_DIALER, 0660, "cua%s.init", namebuf); 2996 dev_depends(tp->t_dev, cp); 2997 cp->si_drv1 = tp->t_sc; 2998 cp->si_drv2 = &tp->t_init_out; 2999 cp->si_tty = tp; 3000 3001 cp = make_dev(&ttys_cdevsw, sminor | MINOR_CALLOUT | MINOR_LOCK, 3002 UID_UUCP, GID_DIALER, 0660, "cua%s.lock", namebuf); 3003 dev_depends(tp->t_dev, cp); 3004 cp->si_drv1 = tp->t_sc; 3005 cp->si_drv2 = &tp->t_lock_out; 3006 cp->si_tty = tp; 3007 } 3008 3009 return (0); 3010 } 3011 3012 /* 3013 * This function is called when the hardware disappears. We set a flag 3014 * and wake up stuff so all sleeping threads will notice. 3015 */ 3016 void 3017 ttygone(struct tty *tp) 3018 { 3019 3020 tp->t_state |= TS_GONE; 3021 if (SEL_WAITING(&tp->t_rsel)) 3022 selwakeuppri(&tp->t_rsel, TTIPRI); 3023 if (SEL_WAITING(&tp->t_wsel)) 3024 selwakeuppri(&tp->t_wsel, TTOPRI); 3025 if (ISSET(tp->t_state, TS_ASYNC) && tp->t_sigio != NULL) 3026 pgsigio(&tp->t_sigio, SIGIO, (tp->t_session != NULL)); 3027 wakeup(&tp->t_dtr_wait); 3028 wakeup(TSA_CARR_ON(tp)); 3029 wakeup(TSA_HUP_OR_INPUT(tp)); 3030 wakeup(TSA_OCOMPLETE(tp)); 3031 wakeup(TSA_OLOWAT(tp)); 3032 KNOTE_UNLOCKED(&tp->t_rsel.si_note, 0); 3033 KNOTE_UNLOCKED(&tp->t_wsel.si_note, 0); 3034 tt_purge(tp); 3035 } 3036 3037 /* 3038 * ttyfree() 3039 * 3040 * Called when the driver is ready to free the tty structure. 3041 * 3042 * XXX: This shall sleep until all threads have left the driver. 3043 */ 3044 void 3045 ttyfree(struct tty *tp) 3046 { 3047 struct cdev *dev; 3048 u_int unit; 3049 3050 mtx_assert(&Giant, MA_OWNED); 3051 ttygone(tp); 3052 unit = tp->t_devunit; 3053 dev = tp->t_mdev; 3054 dev->si_tty = NULL; 3055 tp->t_dev = NULL; 3056 destroy_dev(dev); 3057 ttyrel(tp); 3058 free_unr(tty_unit, unit); 3059 } 3060 3061 static int 3062 sysctl_kern_ttys(SYSCTL_HANDLER_ARGS) 3063 { 3064 struct tty *tp, *tp2; 3065 struct xtty xt; 3066 int error; 3067 3068 error = 0; 3069 mtx_lock(&tty_list_mutex); 3070 tp = TAILQ_FIRST(&tty_list); 3071 if (tp != NULL) 3072 ttyref(tp); 3073 while (tp != NULL) { 3074 if (tp->t_state & TS_GONE) 3075 goto nexttp; 3076 bzero(&xt, sizeof xt); 3077 xt.xt_size = sizeof xt; 3078 #define XT_COPY(field) xt.xt_##field = tp->t_##field 3079 xt.xt_rawcc = tp->t_rawq.c_cc; 3080 xt.xt_cancc = tp->t_canq.c_cc; 3081 xt.xt_outcc = tp->t_outq.c_cc; 3082 XT_COPY(line); 3083 3084 /* 3085 * XXX: We hold the tty list lock while doing this to 3086 * work around a race with pty/pts tty destruction. 3087 * They set t_dev to NULL and then call ttyrel() to 3088 * free the structure which will block on the list 3089 * lock before they call destroy_dev() on the cdev 3090 * backing t_dev. 3091 * 3092 * XXX: ttyfree() now does the same since it has been 3093 * fixed to not leak ttys. 3094 */ 3095 if (tp->t_dev != NULL) 3096 xt.xt_dev = dev2udev(tp->t_dev); 3097 XT_COPY(state); 3098 XT_COPY(flags); 3099 XT_COPY(timeout); 3100 if (tp->t_pgrp != NULL) 3101 xt.xt_pgid = tp->t_pgrp->pg_id; 3102 if (tp->t_session != NULL) 3103 xt.xt_sid = tp->t_session->s_sid; 3104 XT_COPY(termios); 3105 XT_COPY(winsize); 3106 XT_COPY(column); 3107 XT_COPY(rocount); 3108 XT_COPY(rocol); 3109 XT_COPY(ififosize); 3110 XT_COPY(ihiwat); 3111 XT_COPY(ilowat); 3112 XT_COPY(ispeedwat); 3113 XT_COPY(ohiwat); 3114 XT_COPY(olowat); 3115 XT_COPY(ospeedwat); 3116 #undef XT_COPY 3117 mtx_unlock(&tty_list_mutex); 3118 error = SYSCTL_OUT(req, &xt, sizeof xt); 3119 if (error != 0) { 3120 ttyrel(tp); 3121 return (error); 3122 } 3123 mtx_lock(&tty_list_mutex); 3124 nexttp: tp2 = TAILQ_NEXT(tp, t_list); 3125 if (tp2 != NULL) 3126 ttyref(tp2); 3127 mtx_unlock(&tty_list_mutex); 3128 ttyrel(tp); 3129 tp = tp2; 3130 mtx_lock(&tty_list_mutex); 3131 } 3132 mtx_unlock(&tty_list_mutex); 3133 return (0); 3134 } 3135 3136 SYSCTL_PROC(_kern, OID_AUTO, ttys, CTLTYPE_OPAQUE|CTLFLAG_RD, 3137 0, 0, sysctl_kern_ttys, "S,xtty", "All ttys"); 3138 SYSCTL_LONG(_kern, OID_AUTO, tty_nin, CTLFLAG_RD, 3139 &tk_nin, 0, "Total TTY in characters"); 3140 SYSCTL_LONG(_kern, OID_AUTO, tty_nout, CTLFLAG_RD, 3141 &tk_nout, 0, "Total TTY out characters"); 3142 3143 void 3144 nottystop(struct tty *tp, int rw) 3145 { 3146 3147 return; 3148 } 3149 3150 int 3151 ttyopen(struct cdev *dev, int flag, int mode, struct thread *td) 3152 { 3153 int error; 3154 int s; 3155 struct tty *tp; 3156 3157 tp = dev->si_tty; 3158 3159 s = spltty(); 3160 /* 3161 * We jump to this label after all non-interrupted sleeps to pick 3162 * up any changes of the device state. 3163 */ 3164 open_top: 3165 if (tp->t_state & TS_GONE) 3166 return (ENXIO); 3167 error = ttydtrwaitsleep(tp); 3168 if (error) 3169 goto out; 3170 if (tp->t_state & TS_ISOPEN) { 3171 /* 3172 * The device is open, so everything has been initialized. 3173 * Handle conflicts. 3174 */ 3175 if (ISCALLOUT(dev) && !tp->t_actout) 3176 return (EBUSY); 3177 if (tp->t_actout && !ISCALLOUT(dev)) { 3178 if (flag & O_NONBLOCK) 3179 return (EBUSY); 3180 error = tsleep(&tp->t_actout, 3181 TTIPRI | PCATCH, "ttybi", 0); 3182 if (error != 0 || (tp->t_state & TS_GONE)) 3183 goto out; 3184 goto open_top; 3185 } 3186 if (tp->t_state & TS_XCLUDE && priv_check(td, 3187 PRIV_TTY_EXCLUSIVE)) 3188 return (EBUSY); 3189 } else { 3190 /* 3191 * The device isn't open, so there are no conflicts. 3192 * Initialize it. Initialization is done twice in many 3193 * cases: to preempt sleeping callin opens if we are 3194 * callout, and to complete a callin open after DCD rises. 3195 */ 3196 tp->t_termios = ISCALLOUT(dev) ? tp->t_init_out : tp->t_init_in; 3197 tp->t_cflag = tp->t_termios.c_cflag; 3198 if (tp->t_modem != NULL) 3199 tt_modem(tp, SER_DTR | SER_RTS, 0); 3200 ++tp->t_wopeners; 3201 error = tt_param(tp, &tp->t_termios); 3202 --tp->t_wopeners; 3203 if (error == 0) 3204 error = tt_open(tp, dev); 3205 if (error != 0) 3206 goto out; 3207 if (ISCALLOUT(dev) || (tt_modem(tp, 0, 0) & SER_DCD)) 3208 ttyld_modem(tp, 1); 3209 } 3210 /* 3211 * Wait for DCD if necessary. 3212 */ 3213 if (!(tp->t_state & TS_CARR_ON) && !ISCALLOUT(dev) 3214 && !(tp->t_cflag & CLOCAL) && !(flag & O_NONBLOCK)) { 3215 ++tp->t_wopeners; 3216 error = tsleep(TSA_CARR_ON(tp), TTIPRI | PCATCH, "ttydcd", 0); 3217 --tp->t_wopeners; 3218 if (error != 0 || (tp->t_state & TS_GONE)) 3219 goto out; 3220 goto open_top; 3221 } 3222 error = ttyld_open(tp, dev); 3223 ttyldoptim(tp); 3224 if (tp->t_state & TS_ISOPEN && ISCALLOUT(dev)) 3225 tp->t_actout = TRUE; 3226 out: 3227 splx(s); 3228 if (!(tp->t_state & TS_ISOPEN) && tp->t_wopeners == 0) 3229 tt_close(tp); 3230 return (error); 3231 } 3232 3233 int 3234 ttyclose(struct cdev *dev, int flag, int mode, struct thread *td) 3235 { 3236 struct tty *tp; 3237 3238 tp = dev->si_tty; 3239 ttyld_close(tp, flag); 3240 ttyldoptim(tp); 3241 tt_close(tp); 3242 tp->t_do_timestamp = 0; 3243 if (tp->t_pps != NULL) 3244 tp->t_pps->ppsparam.mode = 0; 3245 tty_close(tp); 3246 return (0); 3247 } 3248 3249 int 3250 ttyread(struct cdev *dev, struct uio *uio, int flag) 3251 { 3252 struct tty *tp; 3253 3254 tp = tty_gettp(dev); 3255 3256 if (tp == NULL || (tp->t_state & TS_GONE)) 3257 return (ENODEV); 3258 return (ttyld_read(tp, uio, flag)); 3259 } 3260 3261 int 3262 ttywrite(struct cdev *dev, struct uio *uio, int flag) 3263 { 3264 struct tty *tp; 3265 3266 tp = tty_gettp(dev); 3267 3268 if (tp == NULL || (tp->t_state & TS_GONE)) 3269 return (ENODEV); 3270 return (ttyld_write(tp, uio, flag)); 3271 } 3272 3273 int 3274 ttyioctl(struct cdev *dev, u_long cmd, caddr_t data, int flag, struct thread *td) 3275 { 3276 struct tty *tp; 3277 int error; 3278 3279 tp = dev->si_tty; 3280 3281 if (cmd == TIOCSETA || cmd == TIOCSETAW || cmd == TIOCSETAF) { 3282 int cc; 3283 struct termios *dt = (struct termios *)data; 3284 struct termios *lt = 3285 ISCALLOUT(dev) ? &tp->t_lock_out : &tp->t_lock_in; 3286 3287 dt->c_iflag = (tp->t_iflag & lt->c_iflag) 3288 | (dt->c_iflag & ~lt->c_iflag); 3289 dt->c_oflag = (tp->t_oflag & lt->c_oflag) 3290 | (dt->c_oflag & ~lt->c_oflag); 3291 dt->c_cflag = (tp->t_cflag & lt->c_cflag) 3292 | (dt->c_cflag & ~lt->c_cflag); 3293 dt->c_lflag = (tp->t_lflag & lt->c_lflag) 3294 | (dt->c_lflag & ~lt->c_lflag); 3295 for (cc = 0; cc < NCCS; ++cc) 3296 if (lt->c_cc[cc] != 0) 3297 dt->c_cc[cc] = tp->t_cc[cc]; 3298 if (lt->c_ispeed != 0) 3299 dt->c_ispeed = tp->t_ispeed; 3300 if (lt->c_ospeed != 0) 3301 dt->c_ospeed = tp->t_ospeed; 3302 } 3303 3304 error = ttyld_ioctl(tp, cmd, data, flag, td); 3305 if (error == ENOIOCTL) 3306 error = ttioctl(tp, cmd, data, flag); 3307 ttyldoptim(tp); 3308 if (error != ENOIOCTL) 3309 return (error); 3310 return (ENOTTY); 3311 } 3312 3313 void 3314 ttyldoptim(struct tty *tp) 3315 { 3316 struct termios *t; 3317 3318 t = &tp->t_termios; 3319 if (!(t->c_iflag & (ICRNL | IGNCR | IMAXBEL | INLCR | ISTRIP | IXON)) 3320 && (!(t->c_iflag & BRKINT) || (t->c_iflag & IGNBRK)) 3321 && (!(t->c_iflag & PARMRK) 3322 || (t->c_iflag & (IGNPAR | IGNBRK)) == (IGNPAR | IGNBRK)) 3323 && !(t->c_lflag & (ECHO | ICANON | IEXTEN | ISIG | PENDIN)) 3324 && linesw[tp->t_line]->l_rint == ttyinput) 3325 tp->t_state |= TS_CAN_BYPASS_L_RINT; 3326 else 3327 tp->t_state &= ~TS_CAN_BYPASS_L_RINT; 3328 } 3329 3330 static void 3331 ttydtrwaitwakeup(void *arg) 3332 { 3333 struct tty *tp; 3334 3335 tp = arg; 3336 tp->t_state &= ~TS_DTR_WAIT; 3337 wakeup(&tp->t_dtr_wait); 3338 } 3339 3340 3341 void 3342 ttydtrwaitstart(struct tty *tp) 3343 { 3344 3345 if (tp->t_dtr_wait == 0) 3346 return; 3347 if (tp->t_state & TS_DTR_WAIT) 3348 return; 3349 timeout(ttydtrwaitwakeup, tp, tp->t_dtr_wait); 3350 tp->t_state |= TS_DTR_WAIT; 3351 } 3352 3353 int 3354 ttydtrwaitsleep(struct tty *tp) 3355 { 3356 int error; 3357 3358 error = 0; 3359 while (error == 0) { 3360 if (tp->t_state & TS_GONE) 3361 error = ENXIO; 3362 else if (!(tp->t_state & TS_DTR_WAIT)) 3363 break; 3364 else 3365 error = tsleep(&tp->t_dtr_wait, TTIPRI | PCATCH, 3366 "dtrwait", 0); 3367 } 3368 return (error); 3369 } 3370 3371 static int 3372 ttysopen(struct cdev *dev, int flag, int mode, struct thread *td) 3373 { 3374 struct tty *tp; 3375 3376 tp = dev->si_tty; 3377 KASSERT(tp != NULL, 3378 ("ttysopen(): no tty pointer on device (%s)", devtoname(dev))); 3379 if (tp->t_state & TS_GONE) 3380 return (ENODEV); 3381 return (0); 3382 } 3383 3384 static int 3385 ttysclose(struct cdev *dev, int flag, int mode, struct thread *td) 3386 { 3387 3388 return (0); 3389 } 3390 3391 static int 3392 ttysrdwr(struct cdev *dev, struct uio *uio, int flag) 3393 { 3394 3395 return (ENODEV); 3396 } 3397 3398 static int 3399 ttysioctl(struct cdev *dev, u_long cmd, caddr_t data, int flag, struct thread *td) 3400 { 3401 struct tty *tp; 3402 int error; 3403 struct termios *ct; 3404 3405 tp = dev->si_tty; 3406 KASSERT(tp != NULL, 3407 ("ttysopen(): no tty pointer on device (%s)", devtoname(dev))); 3408 if (tp->t_state & TS_GONE) 3409 return (ENODEV); 3410 ct = dev->si_drv2; 3411 switch (cmd) { 3412 case TIOCSETA: 3413 error = priv_check(td, PRIV_TTY_SETA); 3414 if (error != 0) 3415 return (error); 3416 *ct = *(struct termios *)data; 3417 return (0); 3418 case TIOCGETA: 3419 *(struct termios *)data = *ct; 3420 return (0); 3421 case TIOCGETD: 3422 *(int *)data = TTYDISC; 3423 return (0); 3424 case TIOCGWINSZ: 3425 bzero(data, sizeof(struct winsize)); 3426 return (0); 3427 default: 3428 if (tp->t_cioctl != NULL) 3429 return(tp->t_cioctl(dev, cmd, data, flag, td)); 3430 return (ENOTTY); 3431 } 3432 } 3433 3434 /* 3435 * Initialize a tty to sane modes. 3436 */ 3437 void 3438 ttyinitmode(struct tty *tp, int echo, int speed) 3439 { 3440 3441 if (speed == 0) 3442 speed = TTYDEF_SPEED; 3443 tp->t_init_in.c_iflag = TTYDEF_IFLAG; 3444 tp->t_init_in.c_oflag = TTYDEF_OFLAG; 3445 tp->t_init_in.c_cflag = TTYDEF_CFLAG; 3446 if (echo) 3447 tp->t_init_in.c_lflag = TTYDEF_LFLAG_ECHO; 3448 else 3449 tp->t_init_in.c_lflag = TTYDEF_LFLAG_NOECHO; 3450 3451 tp->t_init_in.c_ispeed = tp->t_init_in.c_ospeed = speed; 3452 termioschars(&tp->t_init_in); 3453 tp->t_init_out = tp->t_init_in; 3454 tp->t_termios = tp->t_init_in; 3455 } 3456 3457 /* 3458 * Use more "normal" termios paramters for consoles. 3459 */ 3460 void 3461 ttyconsolemode(struct tty *tp, int speed) 3462 { 3463 3464 if (speed == 0) 3465 speed = TTYDEF_SPEED; 3466 ttyinitmode(tp, 1, speed); 3467 tp->t_init_in.c_cflag |= CLOCAL; 3468 tp->t_lock_out.c_cflag = tp->t_lock_in.c_cflag = CLOCAL; 3469 tp->t_lock_out.c_ispeed = tp->t_lock_out.c_ospeed = 3470 tp->t_lock_in.c_ispeed = tp->t_lock_in.c_ospeed = speed; 3471 tp->t_init_out = tp->t_init_in; 3472 tp->t_termios = tp->t_init_in; 3473 ttsetwater(tp); 3474 } 3475 3476 /* 3477 * Record the relationship between the serial ports notion of modem control 3478 * signals and the one used in certain ioctls in a way the compiler can enforce 3479 * XXX: We should define TIOCM_* in terms of SER_ if we can limit the 3480 * XXX: consequences of the #include work that would take. 3481 */ 3482 CTASSERT(SER_DTR == TIOCM_DTR / 2); 3483 CTASSERT(SER_RTS == TIOCM_RTS / 2); 3484 CTASSERT(SER_STX == TIOCM_ST / 2); 3485 CTASSERT(SER_SRX == TIOCM_SR / 2); 3486 CTASSERT(SER_CTS == TIOCM_CTS / 2); 3487 CTASSERT(SER_DCD == TIOCM_DCD / 2); 3488 CTASSERT(SER_RI == TIOCM_RI / 2); 3489 CTASSERT(SER_DSR == TIOCM_DSR / 2); 3490
Cache object: fae439442a03e9a9f54ddcfc0a631c98
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