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 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the University of 21 * California, Berkeley and its contributors. 22 * 4. Neither the name of the University nor the names of its contributors 23 * may be used to endorse or promote products derived from this software 24 * without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36 * SUCH DAMAGE. 37 * 38 * @(#)tty.c 8.8 (Berkeley) 1/21/94 39 * $FreeBSD$ 40 */ 41 42 /*- 43 * TODO: 44 * o Fix races for sending the start char in ttyflush(). 45 * o Handle inter-byte timeout for "MIN > 0, TIME > 0" in ttyselect(). 46 * With luck, there will be MIN chars before select() returns(). 47 * o Handle CLOCAL consistently for ptys. Perhaps disallow setting it. 48 * o Don't allow input in TS_ZOMBIE case. It would be visible through 49 * FIONREAD. 50 * o Do the new sio locking stuff here and use it to avoid special 51 * case for EXTPROC? 52 * o Lock PENDIN too? 53 * o Move EXTPROC and/or PENDIN to t_state? 54 * o Wrap most of ttioctl in spltty/splx. 55 * o Implement TIOCNOTTY or remove it from <sys/ioctl.h>. 56 * o Send STOP if IXOFF is toggled off while TS_TBLOCK is set. 57 * o Don't allow certain termios flags to affect disciplines other 58 * than TTYDISC. Cancel their effects before switch disciplines 59 * and ignore them if they are set while we are in another 60 * discipline. 61 * o Now that historical speed conversions are handled here, don't 62 * do them in drivers. 63 * o Check for TS_CARR_ON being set while everything is closed and not 64 * waiting for carrier. TS_CARR_ON isn't cleared if nothing is open, 65 * so it would live until the next open even if carrier drops. 66 * o Restore TS_WOPEN since it is useful in pstat. It must be cleared 67 * only when _all_ openers leave open(). 68 */ 69 70 #include <sys/cdefs.h> 71 __FBSDID("$FreeBSD$"); 72 73 #include "opt_compat.h" 74 #include "opt_uconsole.h" 75 76 #include <sys/param.h> 77 #include <sys/systm.h> 78 #include <sys/filio.h> 79 #if defined(COMPAT_43) || defined(COMPAT_SUNOS) 80 #include <sys/ioctl_compat.h> 81 #endif 82 #include <sys/proc.h> 83 #define TTYDEFCHARS 84 #include <sys/tty.h> 85 #undef TTYDEFCHARS 86 #include <sys/fcntl.h> 87 #include <sys/conf.h> 88 #include <sys/dkstat.h> 89 #include <sys/poll.h> 90 #include <sys/kernel.h> 91 #include <sys/vnode.h> 92 #include <sys/signalvar.h> 93 #include <sys/resourcevar.h> 94 #include <sys/malloc.h> 95 #include <sys/filedesc.h> 96 #include <sys/sysctl.h> 97 98 #include <vm/vm.h> 99 #include <sys/lock.h> 100 #include <vm/pmap.h> 101 #include <vm/vm_map.h> 102 103 MALLOC_DEFINE(M_TTYS, "ttys", "tty data structures"); 104 105 static int proc_compare __P((struct proc *p1, struct proc *p2)); 106 static int ttnread __P((struct tty *tp)); 107 static void ttyecho __P((int c, struct tty *tp)); 108 static int ttyoutput __P((int c, register struct tty *tp)); 109 static void ttypend __P((struct tty *tp)); 110 static void ttyretype __P((struct tty *tp)); 111 static void ttyrub __P((int c, struct tty *tp)); 112 static void ttyrubo __P((struct tty *tp, int cnt)); 113 static void ttyunblock __P((struct tty *tp)); 114 static int ttywflush __P((struct tty *tp)); 115 static int filt_ttyread __P((struct knote *kn, long hint)); 116 static void filt_ttyrdetach __P((struct knote *kn)); 117 static int filt_ttywrite __P((struct knote *kn, long hint)); 118 static void filt_ttywdetach __P((struct knote *kn)); 119 120 /* 121 * Table with character classes and parity. The 8th bit indicates parity, 122 * the 7th bit indicates the character is an alphameric or underscore (for 123 * ALTWERASE), and the low 6 bits indicate delay type. If the low 6 bits 124 * are 0 then the character needs no special processing on output; classes 125 * other than 0 might be translated or (not currently) require delays. 126 */ 127 #define E 0x00 /* Even parity. */ 128 #define O 0x80 /* Odd parity. */ 129 #define PARITY(c) (char_type[c] & O) 130 131 #define ALPHA 0x40 /* Alpha or underscore. */ 132 #define ISALPHA(c) (char_type[(c) & TTY_CHARMASK] & ALPHA) 133 134 #define CCLASSMASK 0x3f 135 #define CCLASS(c) (char_type[c] & CCLASSMASK) 136 137 #define BS BACKSPACE 138 #define CC CONTROL 139 #define CR RETURN 140 #define NA ORDINARY | ALPHA 141 #define NL NEWLINE 142 #define NO ORDINARY 143 #define TB TAB 144 #define VT VTAB 145 146 static u_char const char_type[] = { 147 E|CC, O|CC, O|CC, E|CC, O|CC, E|CC, E|CC, O|CC, /* nul - bel */ 148 O|BS, E|TB, E|NL, O|CC, E|VT, O|CR, O|CC, E|CC, /* bs - si */ 149 O|CC, E|CC, E|CC, O|CC, E|CC, O|CC, O|CC, E|CC, /* dle - etb */ 150 E|CC, O|CC, O|CC, E|CC, O|CC, E|CC, E|CC, O|CC, /* can - us */ 151 O|NO, E|NO, E|NO, O|NO, E|NO, O|NO, O|NO, E|NO, /* sp - ' */ 152 E|NO, O|NO, O|NO, E|NO, O|NO, E|NO, E|NO, O|NO, /* ( - / */ 153 E|NA, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* 0 - 7 */ 154 O|NA, E|NA, E|NO, O|NO, E|NO, O|NO, O|NO, E|NO, /* 8 - ? */ 155 O|NO, E|NA, E|NA, O|NA, E|NA, O|NA, O|NA, E|NA, /* @ - G */ 156 E|NA, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* H - O */ 157 E|NA, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* P - W */ 158 O|NA, E|NA, E|NA, O|NO, E|NO, O|NO, O|NO, O|NA, /* X - _ */ 159 E|NO, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* ` - g */ 160 O|NA, E|NA, E|NA, O|NA, E|NA, O|NA, O|NA, E|NA, /* h - o */ 161 O|NA, E|NA, E|NA, O|NA, E|NA, O|NA, O|NA, E|NA, /* p - w */ 162 E|NA, O|NA, O|NA, E|NO, O|NO, E|NO, E|NO, O|CC, /* x - del */ 163 /* 164 * Meta chars; should be settable per character set; 165 * for now, treat them all as normal characters. 166 */ 167 NA, NA, NA, NA, NA, NA, NA, NA, 168 NA, NA, NA, NA, NA, NA, NA, NA, 169 NA, NA, NA, NA, NA, NA, NA, NA, 170 NA, NA, NA, NA, NA, NA, NA, NA, 171 NA, NA, NA, NA, NA, NA, NA, NA, 172 NA, NA, NA, NA, NA, NA, NA, NA, 173 NA, NA, NA, NA, NA, NA, NA, NA, 174 NA, NA, NA, NA, NA, NA, NA, NA, 175 NA, NA, NA, NA, NA, NA, NA, NA, 176 NA, NA, NA, NA, NA, NA, NA, NA, 177 NA, NA, NA, NA, NA, NA, NA, NA, 178 NA, NA, NA, NA, NA, NA, NA, NA, 179 NA, NA, NA, NA, NA, NA, NA, NA, 180 NA, NA, NA, NA, NA, NA, NA, NA, 181 NA, NA, NA, NA, NA, NA, NA, NA, 182 NA, NA, NA, NA, NA, NA, NA, NA, 183 }; 184 #undef BS 185 #undef CC 186 #undef CR 187 #undef NA 188 #undef NL 189 #undef NO 190 #undef TB 191 #undef VT 192 193 /* Macros to clear/set/test flags. */ 194 #define SET(t, f) (t) |= (f) 195 #define CLR(t, f) (t) &= ~(f) 196 #define ISSET(t, f) ((t) & (f)) 197 198 #undef MAX_INPUT /* XXX wrong in <sys/syslimits.h> */ 199 #define MAX_INPUT TTYHOG /* XXX limit is usually larger for !ICANON */ 200 201 /* 202 * list of struct tty where pstat(8) can pick it up with sysctl 203 */ 204 static SLIST_HEAD(, tty) tty_list; 205 206 /* 207 * Initial open of tty, or (re)entry to standard tty line discipline. 208 */ 209 int 210 ttyopen(device, tp) 211 dev_t device; 212 register struct tty *tp; 213 { 214 int s; 215 216 s = spltty(); 217 tp->t_dev = device; 218 if (!ISSET(tp->t_state, TS_ISOPEN)) { 219 SET(tp->t_state, TS_ISOPEN); 220 if (ISSET(tp->t_cflag, CLOCAL)) 221 SET(tp->t_state, TS_CONNECTED); 222 bzero(&tp->t_winsize, sizeof(tp->t_winsize)); 223 } 224 ttsetwater(tp); 225 splx(s); 226 return (0); 227 } 228 229 /* 230 * Handle close() on a tty line: flush and set to initial state, 231 * bumping generation number so that pending read/write calls 232 * can detect recycling of the tty. 233 * XXX our caller should have done `spltty(); l_close(); ttyclose();' 234 * and l_close() should have flushed, but we repeat the spltty() and 235 * the flush in case there are buggy callers. 236 */ 237 int 238 ttyclose(tp) 239 register struct tty *tp; 240 { 241 int s; 242 243 funsetown(tp->t_sigio); 244 s = spltty(); 245 if (constty == tp) 246 constty = NULL; 247 248 ttyflush(tp, FREAD | FWRITE); 249 clist_free_cblocks(&tp->t_canq); 250 clist_free_cblocks(&tp->t_outq); 251 clist_free_cblocks(&tp->t_rawq); 252 253 tp->t_gen++; 254 tp->t_line = TTYDISC; 255 tp->t_pgrp = NULL; 256 tp->t_session = NULL; 257 tp->t_state = 0; 258 splx(s); 259 return (0); 260 } 261 262 #define FLUSHQ(q) { \ 263 if ((q)->c_cc) \ 264 ndflush(q, (q)->c_cc); \ 265 } 266 267 /* Is 'c' a line delimiter ("break" character)? */ 268 #define TTBREAKC(c, lflag) \ 269 ((c) == '\n' || (((c) == cc[VEOF] || \ 270 (c) == cc[VEOL] || ((c) == cc[VEOL2] && lflag & IEXTEN)) && \ 271 (c) != _POSIX_VDISABLE)) 272 273 /* 274 * Process input of a single character received on a tty. 275 */ 276 int 277 ttyinput(c, tp) 278 register int c; 279 register struct tty *tp; 280 { 281 register tcflag_t iflag, lflag; 282 register cc_t *cc; 283 int i, err; 284 285 /* 286 * If input is pending take it first. 287 */ 288 lflag = tp->t_lflag; 289 if (ISSET(lflag, PENDIN)) 290 ttypend(tp); 291 /* 292 * Gather stats. 293 */ 294 if (ISSET(lflag, ICANON)) { 295 ++tk_cancc; 296 ++tp->t_cancc; 297 } else { 298 ++tk_rawcc; 299 ++tp->t_rawcc; 300 } 301 ++tk_nin; 302 303 /* 304 * Block further input iff: 305 * current input > threshold AND input is available to user program 306 * AND input flow control is enabled and not yet invoked. 307 * The 3 is slop for PARMRK. 308 */ 309 iflag = tp->t_iflag; 310 if (tp->t_rawq.c_cc + tp->t_canq.c_cc > tp->t_ihiwat - 3 && 311 (!ISSET(lflag, ICANON) || tp->t_canq.c_cc != 0) && 312 (ISSET(tp->t_cflag, CRTS_IFLOW) || ISSET(iflag, IXOFF)) && 313 !ISSET(tp->t_state, TS_TBLOCK)) 314 ttyblock(tp); 315 316 /* Handle exceptional conditions (break, parity, framing). */ 317 cc = tp->t_cc; 318 err = (ISSET(c, TTY_ERRORMASK)); 319 if (err) { 320 CLR(c, TTY_ERRORMASK); 321 if (ISSET(err, TTY_BI)) { 322 if (ISSET(iflag, IGNBRK)) 323 return (0); 324 if (ISSET(iflag, BRKINT)) { 325 ttyflush(tp, FREAD | FWRITE); 326 pgsignal(tp->t_pgrp, SIGINT, 1); 327 goto endcase; 328 } 329 if (ISSET(iflag, PARMRK)) 330 goto parmrk; 331 } else if ((ISSET(err, TTY_PE) && ISSET(iflag, INPCK)) 332 || ISSET(err, TTY_FE)) { 333 if (ISSET(iflag, IGNPAR)) 334 return (0); 335 else if (ISSET(iflag, PARMRK)) { 336 parmrk: 337 if (tp->t_rawq.c_cc + tp->t_canq.c_cc > 338 MAX_INPUT - 3) 339 goto input_overflow; 340 (void)putc(0377 | TTY_QUOTE, &tp->t_rawq); 341 (void)putc(0 | TTY_QUOTE, &tp->t_rawq); 342 (void)putc(c | TTY_QUOTE, &tp->t_rawq); 343 goto endcase; 344 } else 345 c = 0; 346 } 347 } 348 349 if (!ISSET(tp->t_state, TS_TYPEN) && ISSET(iflag, ISTRIP)) 350 CLR(c, 0x80); 351 if (!ISSET(lflag, EXTPROC)) { 352 /* 353 * Check for literal nexting very first 354 */ 355 if (ISSET(tp->t_state, TS_LNCH)) { 356 SET(c, TTY_QUOTE); 357 CLR(tp->t_state, TS_LNCH); 358 } 359 /* 360 * Scan for special characters. This code 361 * is really just a big case statement with 362 * non-constant cases. The bottom of the 363 * case statement is labeled ``endcase'', so goto 364 * it after a case match, or similar. 365 */ 366 367 /* 368 * Control chars which aren't controlled 369 * by ICANON, ISIG, or IXON. 370 */ 371 if (ISSET(lflag, IEXTEN)) { 372 if (CCEQ(cc[VLNEXT], c)) { 373 if (ISSET(lflag, ECHO)) { 374 if (ISSET(lflag, ECHOE)) { 375 (void)ttyoutput('^', tp); 376 (void)ttyoutput('\b', tp); 377 } else 378 ttyecho(c, tp); 379 } 380 SET(tp->t_state, TS_LNCH); 381 goto endcase; 382 } 383 if (CCEQ(cc[VDISCARD], c)) { 384 if (ISSET(lflag, FLUSHO)) 385 CLR(tp->t_lflag, FLUSHO); 386 else { 387 ttyflush(tp, FWRITE); 388 ttyecho(c, tp); 389 if (tp->t_rawq.c_cc + tp->t_canq.c_cc) 390 ttyretype(tp); 391 SET(tp->t_lflag, FLUSHO); 392 } 393 goto startoutput; 394 } 395 } 396 /* 397 * Signals. 398 */ 399 if (ISSET(lflag, ISIG)) { 400 if (CCEQ(cc[VINTR], c) || CCEQ(cc[VQUIT], c)) { 401 if (!ISSET(lflag, NOFLSH)) 402 ttyflush(tp, FREAD | FWRITE); 403 ttyecho(c, tp); 404 pgsignal(tp->t_pgrp, 405 CCEQ(cc[VINTR], c) ? SIGINT : SIGQUIT, 1); 406 goto endcase; 407 } 408 if (CCEQ(cc[VSUSP], c)) { 409 if (!ISSET(lflag, NOFLSH)) 410 ttyflush(tp, FREAD); 411 ttyecho(c, tp); 412 pgsignal(tp->t_pgrp, SIGTSTP, 1); 413 goto endcase; 414 } 415 } 416 /* 417 * Handle start/stop characters. 418 */ 419 if (ISSET(iflag, IXON)) { 420 if (CCEQ(cc[VSTOP], c)) { 421 if (!ISSET(tp->t_state, TS_TTSTOP)) { 422 SET(tp->t_state, TS_TTSTOP); 423 (*tp->t_stop)(tp, 0); 424 return (0); 425 } 426 if (!CCEQ(cc[VSTART], c)) 427 return (0); 428 /* 429 * if VSTART == VSTOP then toggle 430 */ 431 goto endcase; 432 } 433 if (CCEQ(cc[VSTART], c)) 434 goto restartoutput; 435 } 436 /* 437 * IGNCR, ICRNL, & INLCR 438 */ 439 if (c == '\r') { 440 if (ISSET(iflag, IGNCR)) 441 return (0); 442 else if (ISSET(iflag, ICRNL)) 443 c = '\n'; 444 } else if (c == '\n' && ISSET(iflag, INLCR)) 445 c = '\r'; 446 } 447 if (!ISSET(tp->t_lflag, EXTPROC) && ISSET(lflag, ICANON)) { 448 /* 449 * From here on down canonical mode character 450 * processing takes place. 451 */ 452 /* 453 * erase or erase2 (^H / ^?) 454 */ 455 if (CCEQ(cc[VERASE], c) || CCEQ(cc[VERASE2], c) ) { 456 if (tp->t_rawq.c_cc) 457 ttyrub(unputc(&tp->t_rawq), tp); 458 goto endcase; 459 } 460 /* 461 * kill (^U) 462 */ 463 if (CCEQ(cc[VKILL], c)) { 464 if (ISSET(lflag, ECHOKE) && 465 tp->t_rawq.c_cc == tp->t_rocount && 466 !ISSET(lflag, ECHOPRT)) 467 while (tp->t_rawq.c_cc) 468 ttyrub(unputc(&tp->t_rawq), tp); 469 else { 470 ttyecho(c, tp); 471 if (ISSET(lflag, ECHOK) || 472 ISSET(lflag, ECHOKE)) 473 ttyecho('\n', tp); 474 FLUSHQ(&tp->t_rawq); 475 tp->t_rocount = 0; 476 } 477 CLR(tp->t_state, TS_LOCAL); 478 goto endcase; 479 } 480 /* 481 * word erase (^W) 482 */ 483 if (CCEQ(cc[VWERASE], c) && ISSET(lflag, IEXTEN)) { 484 int ctype; 485 486 /* 487 * erase whitespace 488 */ 489 while ((c = unputc(&tp->t_rawq)) == ' ' || c == '\t') 490 ttyrub(c, tp); 491 if (c == -1) 492 goto endcase; 493 /* 494 * erase last char of word and remember the 495 * next chars type (for ALTWERASE) 496 */ 497 ttyrub(c, tp); 498 c = unputc(&tp->t_rawq); 499 if (c == -1) 500 goto endcase; 501 if (c == ' ' || c == '\t') { 502 (void)putc(c, &tp->t_rawq); 503 goto endcase; 504 } 505 ctype = ISALPHA(c); 506 /* 507 * erase rest of word 508 */ 509 do { 510 ttyrub(c, tp); 511 c = unputc(&tp->t_rawq); 512 if (c == -1) 513 goto endcase; 514 } while (c != ' ' && c != '\t' && 515 (!ISSET(lflag, ALTWERASE) || ISALPHA(c) == ctype)); 516 (void)putc(c, &tp->t_rawq); 517 goto endcase; 518 } 519 /* 520 * reprint line (^R) 521 */ 522 if (CCEQ(cc[VREPRINT], c) && ISSET(lflag, IEXTEN)) { 523 ttyretype(tp); 524 goto endcase; 525 } 526 /* 527 * ^T - kernel info and generate SIGINFO 528 */ 529 if (CCEQ(cc[VSTATUS], c) && ISSET(lflag, IEXTEN)) { 530 if (ISSET(lflag, ISIG)) 531 pgsignal(tp->t_pgrp, SIGINFO, 1); 532 if (!ISSET(lflag, NOKERNINFO)) 533 ttyinfo(tp); 534 goto endcase; 535 } 536 } 537 /* 538 * Check for input buffer overflow 539 */ 540 if (tp->t_rawq.c_cc + tp->t_canq.c_cc >= MAX_INPUT) { 541 input_overflow: 542 if (ISSET(iflag, IMAXBEL)) { 543 if (tp->t_outq.c_cc < tp->t_ohiwat) 544 (void)ttyoutput(CTRL('g'), tp); 545 } 546 goto endcase; 547 } 548 549 if ( c == 0377 && ISSET(iflag, PARMRK) && !ISSET(iflag, ISTRIP) 550 && ISSET(iflag, IGNBRK|IGNPAR) != (IGNBRK|IGNPAR)) 551 (void)putc(0377 | TTY_QUOTE, &tp->t_rawq); 552 553 /* 554 * Put data char in q for user and 555 * wakeup on seeing a line delimiter. 556 */ 557 if (putc(c, &tp->t_rawq) >= 0) { 558 if (!ISSET(lflag, ICANON)) { 559 ttwakeup(tp); 560 ttyecho(c, tp); 561 goto endcase; 562 } 563 if (TTBREAKC(c, lflag)) { 564 tp->t_rocount = 0; 565 catq(&tp->t_rawq, &tp->t_canq); 566 ttwakeup(tp); 567 } else if (tp->t_rocount++ == 0) 568 tp->t_rocol = tp->t_column; 569 if (ISSET(tp->t_state, TS_ERASE)) { 570 /* 571 * end of prterase \.../ 572 */ 573 CLR(tp->t_state, TS_ERASE); 574 (void)ttyoutput('/', tp); 575 } 576 i = tp->t_column; 577 ttyecho(c, tp); 578 if (CCEQ(cc[VEOF], c) && ISSET(lflag, ECHO)) { 579 /* 580 * Place the cursor over the '^' of the ^D. 581 */ 582 i = imin(2, tp->t_column - i); 583 while (i > 0) { 584 (void)ttyoutput('\b', tp); 585 i--; 586 } 587 } 588 } 589 endcase: 590 /* 591 * IXANY means allow any character to restart output. 592 */ 593 if (ISSET(tp->t_state, TS_TTSTOP) && 594 !ISSET(iflag, IXANY) && cc[VSTART] != cc[VSTOP]) 595 return (0); 596 restartoutput: 597 CLR(tp->t_lflag, FLUSHO); 598 CLR(tp->t_state, TS_TTSTOP); 599 startoutput: 600 return (ttstart(tp)); 601 } 602 603 /* 604 * Output a single character on a tty, doing output processing 605 * as needed (expanding tabs, newline processing, etc.). 606 * Returns < 0 if succeeds, otherwise returns char to resend. 607 * Must be recursive. 608 */ 609 static int 610 ttyoutput(c, tp) 611 register int c; 612 register struct tty *tp; 613 { 614 register tcflag_t oflag; 615 register int col, s; 616 617 oflag = tp->t_oflag; 618 if (!ISSET(oflag, OPOST)) { 619 if (ISSET(tp->t_lflag, FLUSHO)) 620 return (-1); 621 if (putc(c, &tp->t_outq)) 622 return (c); 623 tk_nout++; 624 tp->t_outcc++; 625 return (-1); 626 } 627 /* 628 * Do tab expansion if OXTABS is set. Special case if we external 629 * processing, we don't do the tab expansion because we'll probably 630 * get it wrong. If tab expansion needs to be done, let it happen 631 * externally. 632 */ 633 CLR(c, ~TTY_CHARMASK); 634 if (c == '\t' && 635 ISSET(oflag, OXTABS) && !ISSET(tp->t_lflag, EXTPROC)) { 636 c = 8 - (tp->t_column & 7); 637 if (!ISSET(tp->t_lflag, FLUSHO)) { 638 s = spltty(); /* Don't interrupt tabs. */ 639 c -= b_to_q(" ", c, &tp->t_outq); 640 tk_nout += c; 641 tp->t_outcc += c; 642 splx(s); 643 } 644 tp->t_column += c; 645 return (c ? -1 : '\t'); 646 } 647 if (c == CEOT && ISSET(oflag, ONOEOT)) 648 return (-1); 649 650 /* 651 * Newline translation: if ONLCR is set, 652 * translate newline into "\r\n". 653 */ 654 if (c == '\n' && ISSET(tp->t_oflag, ONLCR)) { 655 tk_nout++; 656 tp->t_outcc++; 657 if (!ISSET(tp->t_lflag, FLUSHO) && putc('\r', &tp->t_outq)) 658 return (c); 659 } 660 /* If OCRNL is set, translate "\r" into "\n". */ 661 else if (c == '\r' && ISSET(tp->t_oflag, OCRNL)) 662 c = '\n'; 663 /* If ONOCR is set, don't transmit CRs when on column 0. */ 664 else if (c == '\r' && ISSET(tp->t_oflag, ONOCR) && tp->t_column == 0) 665 return (-1); 666 667 tk_nout++; 668 tp->t_outcc++; 669 if (!ISSET(tp->t_lflag, FLUSHO) && putc(c, &tp->t_outq)) 670 return (c); 671 672 col = tp->t_column; 673 switch (CCLASS(c)) { 674 case BACKSPACE: 675 if (col > 0) 676 --col; 677 break; 678 case CONTROL: 679 break; 680 case NEWLINE: 681 if (ISSET(tp->t_oflag, ONLCR | ONLRET)) 682 col = 0; 683 break; 684 case RETURN: 685 col = 0; 686 break; 687 case ORDINARY: 688 ++col; 689 break; 690 case TAB: 691 col = (col + 8) & ~7; 692 break; 693 } 694 tp->t_column = col; 695 return (-1); 696 } 697 698 /* 699 * Ioctls for all tty devices. Called after line-discipline specific ioctl 700 * has been called to do discipline-specific functions and/or reject any 701 * of these ioctl commands. 702 */ 703 /* ARGSUSED */ 704 int 705 ttioctl(tp, cmd, data, flag) 706 register struct tty *tp; 707 u_long cmd; 708 int flag; 709 void *data; 710 { 711 register struct proc *p; 712 int s, error; 713 714 p = curproc; /* XXX */ 715 716 /* If the ioctl involves modification, hang if in the background. */ 717 switch (cmd) { 718 case TIOCCBRK: 719 case TIOCCONS: 720 case TIOCDRAIN: 721 case TIOCEXCL: 722 case TIOCFLUSH: 723 #ifdef TIOCHPCL 724 case TIOCHPCL: 725 #endif 726 case TIOCNXCL: 727 case TIOCSBRK: 728 case TIOCSCTTY: 729 case TIOCSDRAINWAIT: 730 case TIOCSETA: 731 case TIOCSETAF: 732 case TIOCSETAW: 733 case TIOCSETD: 734 case TIOCSPGRP: 735 case TIOCSTART: 736 case TIOCSTAT: 737 case TIOCSTI: 738 case TIOCSTOP: 739 case TIOCSWINSZ: 740 #if defined(COMPAT_43) || defined(COMPAT_SUNOS) 741 case TIOCLBIC: 742 case TIOCLBIS: 743 case TIOCLSET: 744 case TIOCSETC: 745 case OTIOCSETD: 746 case TIOCSETN: 747 case TIOCSETP: 748 case TIOCSLTC: 749 #endif 750 while (isbackground(p, tp) && !(p->p_flag & P_PPWAIT) && 751 !SIGISMEMBER(p->p_sigignore, SIGTTOU) && 752 !SIGISMEMBER(p->p_sigmask, SIGTTOU)) { 753 if (p->p_pgrp->pg_jobc == 0) 754 return (EIO); 755 pgsignal(p->p_pgrp, SIGTTOU, 1); 756 error = ttysleep(tp, &lbolt, TTOPRI | PCATCH, "ttybg1", 757 0); 758 if (error) 759 return (error); 760 } 761 break; 762 } 763 764 switch (cmd) { /* Process the ioctl. */ 765 case FIOASYNC: /* set/clear async i/o */ 766 s = spltty(); 767 if (*(int *)data) 768 SET(tp->t_state, TS_ASYNC); 769 else 770 CLR(tp->t_state, TS_ASYNC); 771 splx(s); 772 break; 773 case FIONBIO: /* set/clear non-blocking i/o */ 774 break; /* XXX: delete. */ 775 case FIONREAD: /* get # bytes to read */ 776 s = spltty(); 777 *(int *)data = ttnread(tp); 778 splx(s); 779 break; 780 781 case FIOSETOWN: 782 /* 783 * Policy -- Don't allow FIOSETOWN on someone else's 784 * controlling tty 785 */ 786 if (tp->t_session != NULL && !isctty(p, tp)) 787 return (ENOTTY); 788 789 error = fsetown(*(int *)data, &tp->t_sigio); 790 if (error) 791 return (error); 792 break; 793 case FIOGETOWN: 794 if (tp->t_session != NULL && !isctty(p, tp)) 795 return (ENOTTY); 796 *(int *)data = fgetown(tp->t_sigio); 797 break; 798 799 case TIOCEXCL: /* set exclusive use of tty */ 800 s = spltty(); 801 SET(tp->t_state, TS_XCLUDE); 802 splx(s); 803 break; 804 case TIOCFLUSH: { /* flush buffers */ 805 register int flags = *(int *)data; 806 807 if (flags == 0) 808 flags = FREAD | FWRITE; 809 else 810 flags &= FREAD | FWRITE; 811 ttyflush(tp, flags); 812 break; 813 } 814 case TIOCCONS: /* become virtual console */ 815 if (*(int *)data) { 816 if (constty && constty != tp && 817 ISSET(constty->t_state, TS_CONNECTED)) 818 return (EBUSY); 819 #ifndef UCONSOLE 820 if ((error = suser(p)) != 0) 821 return (error); 822 #endif 823 constty = tp; 824 } else if (tp == constty) 825 constty = NULL; 826 break; 827 case TIOCDRAIN: /* wait till output drained */ 828 error = ttywait(tp); 829 if (error) 830 return (error); 831 break; 832 case TIOCGETA: { /* get termios struct */ 833 struct termios *t = (struct termios *)data; 834 835 bcopy(&tp->t_termios, t, sizeof(struct termios)); 836 break; 837 } 838 case TIOCGETD: /* get line discipline */ 839 *(int *)data = tp->t_line; 840 break; 841 case TIOCGWINSZ: /* get window size */ 842 *(struct winsize *)data = tp->t_winsize; 843 break; 844 case TIOCGPGRP: /* get pgrp of tty */ 845 if (!isctty(p, tp)) 846 return (ENOTTY); 847 *(int *)data = tp->t_pgrp ? tp->t_pgrp->pg_id : NO_PID; 848 break; 849 #ifdef TIOCHPCL 850 case TIOCHPCL: /* hang up on last close */ 851 s = spltty(); 852 SET(tp->t_cflag, HUPCL); 853 splx(s); 854 break; 855 #endif 856 case TIOCNXCL: /* reset exclusive use of tty */ 857 s = spltty(); 858 CLR(tp->t_state, TS_XCLUDE); 859 splx(s); 860 break; 861 case TIOCOUTQ: /* output queue size */ 862 *(int *)data = tp->t_outq.c_cc; 863 break; 864 case TIOCSETA: /* set termios struct */ 865 case TIOCSETAW: /* drain output, set */ 866 case TIOCSETAF: { /* drn out, fls in, set */ 867 register struct termios *t = (struct termios *)data; 868 869 if (t->c_ispeed == 0) 870 t->c_ispeed = t->c_ospeed; 871 if (t->c_ispeed == 0) 872 t->c_ispeed = tp->t_ospeed; 873 if (t->c_ispeed == 0) 874 return (EINVAL); 875 s = spltty(); 876 if (cmd == TIOCSETAW || cmd == TIOCSETAF) { 877 error = ttywait(tp); 878 if (error) { 879 splx(s); 880 return (error); 881 } 882 if (cmd == TIOCSETAF) 883 ttyflush(tp, FREAD); 884 } 885 if (!ISSET(t->c_cflag, CIGNORE)) { 886 /* 887 * Set device hardware. 888 */ 889 if (tp->t_param && (error = (*tp->t_param)(tp, t))) { 890 splx(s); 891 return (error); 892 } 893 if (ISSET(t->c_cflag, CLOCAL) && 894 !ISSET(tp->t_cflag, CLOCAL)) { 895 /* 896 * XXX disconnections would be too hard to 897 * get rid of without this kludge. The only 898 * way to get rid of controlling terminals 899 * is to exit from the session leader. 900 */ 901 CLR(tp->t_state, TS_ZOMBIE); 902 903 wakeup(TSA_CARR_ON(tp)); 904 ttwakeup(tp); 905 ttwwakeup(tp); 906 } 907 if ((ISSET(tp->t_state, TS_CARR_ON) || 908 ISSET(t->c_cflag, CLOCAL)) && 909 !ISSET(tp->t_state, TS_ZOMBIE)) 910 SET(tp->t_state, TS_CONNECTED); 911 else 912 CLR(tp->t_state, TS_CONNECTED); 913 tp->t_cflag = t->c_cflag; 914 tp->t_ispeed = t->c_ispeed; 915 if (t->c_ospeed != 0) 916 tp->t_ospeed = t->c_ospeed; 917 ttsetwater(tp); 918 } 919 if (ISSET(t->c_lflag, ICANON) != ISSET(tp->t_lflag, ICANON) && 920 cmd != TIOCSETAF) { 921 if (ISSET(t->c_lflag, ICANON)) 922 SET(tp->t_lflag, PENDIN); 923 else { 924 /* 925 * XXX we really shouldn't allow toggling 926 * ICANON while we're in a non-termios line 927 * discipline. Now we have to worry about 928 * panicing for a null queue. 929 */ 930 if (tp->t_canq.c_cbreserved > 0 && 931 tp->t_rawq.c_cbreserved > 0) { 932 catq(&tp->t_rawq, &tp->t_canq); 933 /* 934 * XXX the queue limits may be 935 * different, so the old queue 936 * swapping method no longer works. 937 */ 938 catq(&tp->t_canq, &tp->t_rawq); 939 } 940 CLR(tp->t_lflag, PENDIN); 941 } 942 ttwakeup(tp); 943 } 944 tp->t_iflag = t->c_iflag; 945 tp->t_oflag = t->c_oflag; 946 /* 947 * Make the EXTPROC bit read only. 948 */ 949 if (ISSET(tp->t_lflag, EXTPROC)) 950 SET(t->c_lflag, EXTPROC); 951 else 952 CLR(t->c_lflag, EXTPROC); 953 tp->t_lflag = t->c_lflag | ISSET(tp->t_lflag, PENDIN); 954 if (t->c_cc[VMIN] != tp->t_cc[VMIN] || 955 t->c_cc[VTIME] != tp->t_cc[VTIME]) 956 ttwakeup(tp); 957 bcopy(t->c_cc, tp->t_cc, sizeof(t->c_cc)); 958 splx(s); 959 break; 960 } 961 case TIOCSETD: { /* set line discipline */ 962 register int t = *(int *)data; 963 dev_t device = tp->t_dev; 964 965 if ((u_int)t >= nlinesw) 966 return (ENXIO); 967 if (t != tp->t_line) { 968 s = spltty(); 969 (*linesw[tp->t_line].l_close)(tp, flag); 970 error = (*linesw[t].l_open)(device, tp); 971 if (error) { 972 (void)(*linesw[tp->t_line].l_open)(device, tp); 973 splx(s); 974 return (error); 975 } 976 tp->t_line = t; 977 splx(s); 978 } 979 break; 980 } 981 case TIOCSTART: /* start output, like ^Q */ 982 s = spltty(); 983 if (ISSET(tp->t_state, TS_TTSTOP) || 984 ISSET(tp->t_lflag, FLUSHO)) { 985 CLR(tp->t_lflag, FLUSHO); 986 CLR(tp->t_state, TS_TTSTOP); 987 ttstart(tp); 988 } 989 splx(s); 990 break; 991 case TIOCSTI: /* simulate terminal input */ 992 if ((flag & FREAD) == 0 && suser(p)) 993 return (EPERM); 994 if (!isctty(p, tp) && suser(p)) 995 return (EACCES); 996 s = spltty(); 997 (*linesw[tp->t_line].l_rint)(*(u_char *)data, tp); 998 splx(s); 999 break; 1000 case TIOCSTOP: /* stop output, like ^S */ 1001 s = spltty(); 1002 if (!ISSET(tp->t_state, TS_TTSTOP)) { 1003 SET(tp->t_state, TS_TTSTOP); 1004 (*tp->t_stop)(tp, 0); 1005 } 1006 splx(s); 1007 break; 1008 case TIOCSCTTY: /* become controlling tty */ 1009 /* Session ctty vnode pointer set in vnode layer. */ 1010 if (!SESS_LEADER(p) || 1011 ((p->p_session->s_ttyvp || tp->t_session) && 1012 (tp->t_session != p->p_session))) 1013 return (EPERM); 1014 tp->t_session = p->p_session; 1015 tp->t_pgrp = p->p_pgrp; 1016 p->p_session->s_ttyp = tp; 1017 p->p_flag |= P_CONTROLT; 1018 break; 1019 case TIOCSPGRP: { /* set pgrp of tty */ 1020 register struct pgrp *pgrp = pgfind(*(int *)data); 1021 1022 if (!isctty(p, tp)) 1023 return (ENOTTY); 1024 else if (pgrp == NULL || pgrp->pg_session != p->p_session) 1025 return (EPERM); 1026 tp->t_pgrp = pgrp; 1027 break; 1028 } 1029 case TIOCSTAT: /* simulate control-T */ 1030 s = spltty(); 1031 ttyinfo(tp); 1032 splx(s); 1033 break; 1034 case TIOCSWINSZ: /* set window size */ 1035 if (bcmp((caddr_t)&tp->t_winsize, data, 1036 sizeof (struct winsize))) { 1037 tp->t_winsize = *(struct winsize *)data; 1038 pgsignal(tp->t_pgrp, SIGWINCH, 1); 1039 } 1040 break; 1041 case TIOCSDRAINWAIT: 1042 error = suser(p); 1043 if (error) 1044 return (error); 1045 tp->t_timeout = *(int *)data * hz; 1046 wakeup(TSA_OCOMPLETE(tp)); 1047 wakeup(TSA_OLOWAT(tp)); 1048 break; 1049 case TIOCGDRAINWAIT: 1050 *(int *)data = tp->t_timeout / hz; 1051 break; 1052 default: 1053 #if defined(COMPAT_43) || defined(COMPAT_SUNOS) 1054 return (ttcompat(tp, cmd, data, flag)); 1055 #else 1056 return (ENOIOCTL); 1057 #endif 1058 } 1059 return (0); 1060 } 1061 1062 int 1063 ttypoll(dev, events, p) 1064 dev_t dev; 1065 int events; 1066 struct proc *p; 1067 { 1068 int s; 1069 int revents = 0; 1070 struct tty *tp; 1071 1072 tp = dev->si_tty; 1073 if (tp == NULL) /* XXX used to return ENXIO, but that means true! */ 1074 return ((events & (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM)) 1075 | POLLHUP); 1076 1077 s = spltty(); 1078 if (events & (POLLIN | POLLRDNORM)) { 1079 if (ISSET(tp->t_state, TS_ZOMBIE)) 1080 revents |= (events & (POLLIN | POLLRDNORM)) | 1081 POLLHUP; 1082 else if (ttnread(tp) > 0) 1083 revents |= events & (POLLIN | POLLRDNORM); 1084 else 1085 selrecord(p, &tp->t_rsel); 1086 } 1087 if (events & POLLOUT) { 1088 if (ISSET(tp->t_state, TS_ZOMBIE)) 1089 revents |= POLLHUP; 1090 else if (tp->t_outq.c_cc <= tp->t_olowat && 1091 ISSET(tp->t_state, TS_CONNECTED)) 1092 revents |= events & POLLOUT; 1093 else 1094 selrecord(p, &tp->t_wsel); 1095 } 1096 splx(s); 1097 return (revents); 1098 } 1099 1100 static struct filterops ttyread_filtops = 1101 { 1, NULL, filt_ttyrdetach, filt_ttyread }; 1102 static struct filterops ttywrite_filtops = 1103 { 1, NULL, filt_ttywdetach, filt_ttywrite }; 1104 1105 int 1106 ttykqfilter(dev, kn) 1107 dev_t dev; 1108 struct knote *kn; 1109 { 1110 struct tty *tp = dev->si_tty; 1111 struct klist *klist; 1112 int s; 1113 1114 switch (kn->kn_filter) { 1115 case EVFILT_READ: 1116 klist = &tp->t_rsel.si_note; 1117 kn->kn_fop = &ttyread_filtops; 1118 break; 1119 case EVFILT_WRITE: 1120 klist = &tp->t_wsel.si_note; 1121 kn->kn_fop = &ttywrite_filtops; 1122 break; 1123 default: 1124 return (1); 1125 } 1126 1127 kn->kn_hook = (caddr_t)dev; 1128 1129 s = spltty(); 1130 SLIST_INSERT_HEAD(klist, kn, kn_selnext); 1131 splx(s); 1132 1133 return (0); 1134 } 1135 1136 static void 1137 filt_ttyrdetach(struct knote *kn) 1138 { 1139 struct tty *tp = ((dev_t)kn->kn_hook)->si_tty; 1140 int s = spltty(); 1141 1142 SLIST_REMOVE(&tp->t_rsel.si_note, kn, knote, kn_selnext); 1143 splx(s); 1144 } 1145 1146 static int 1147 filt_ttyread(struct knote *kn, long hint) 1148 { 1149 struct tty *tp = ((dev_t)kn->kn_hook)->si_tty; 1150 1151 kn->kn_data = ttnread(tp); 1152 if (ISSET(tp->t_state, TS_ZOMBIE)) { 1153 kn->kn_flags |= EV_EOF; 1154 return (1); 1155 } 1156 return (kn->kn_data > 0); 1157 } 1158 1159 static void 1160 filt_ttywdetach(struct knote *kn) 1161 { 1162 struct tty *tp = ((dev_t)kn->kn_hook)->si_tty; 1163 int s = spltty(); 1164 1165 SLIST_REMOVE(&tp->t_wsel.si_note, kn, knote, kn_selnext); 1166 splx(s); 1167 } 1168 1169 static int 1170 filt_ttywrite(kn, hint) 1171 struct knote *kn; 1172 long hint; 1173 { 1174 struct tty *tp = ((dev_t)kn->kn_hook)->si_tty; 1175 1176 kn->kn_data = tp->t_outq.c_cc; 1177 if (ISSET(tp->t_state, TS_ZOMBIE)) 1178 return (1); 1179 return (kn->kn_data <= tp->t_olowat && 1180 ISSET(tp->t_state, TS_CONNECTED)); 1181 } 1182 1183 /* 1184 * Must be called at spltty(). 1185 */ 1186 static int 1187 ttnread(tp) 1188 struct tty *tp; 1189 { 1190 int nread; 1191 1192 if (ISSET(tp->t_lflag, PENDIN)) 1193 ttypend(tp); 1194 nread = tp->t_canq.c_cc; 1195 if (!ISSET(tp->t_lflag, ICANON)) { 1196 nread += tp->t_rawq.c_cc; 1197 if (nread < tp->t_cc[VMIN] && tp->t_cc[VTIME] == 0) 1198 nread = 0; 1199 } 1200 return (nread); 1201 } 1202 1203 /* 1204 * Wait for output to drain. 1205 */ 1206 int 1207 ttywait(tp) 1208 register struct tty *tp; 1209 { 1210 int error, s; 1211 1212 error = 0; 1213 s = spltty(); 1214 while ((tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY)) && 1215 ISSET(tp->t_state, TS_CONNECTED) && tp->t_oproc) { 1216 (*tp->t_oproc)(tp); 1217 if ((tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY)) && 1218 ISSET(tp->t_state, TS_CONNECTED)) { 1219 SET(tp->t_state, TS_SO_OCOMPLETE); 1220 error = ttysleep(tp, TSA_OCOMPLETE(tp), 1221 TTOPRI | PCATCH, "ttywai", 1222 tp->t_timeout); 1223 if (error) { 1224 if (error == EWOULDBLOCK) 1225 error = EIO; 1226 break; 1227 } 1228 } else 1229 break; 1230 } 1231 if (!error && (tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY))) 1232 error = EIO; 1233 splx(s); 1234 return (error); 1235 } 1236 1237 /* 1238 * Flush if successfully wait. 1239 */ 1240 static int 1241 ttywflush(tp) 1242 struct tty *tp; 1243 { 1244 int error; 1245 1246 if ((error = ttywait(tp)) == 0) 1247 ttyflush(tp, FREAD); 1248 return (error); 1249 } 1250 1251 /* 1252 * Flush tty read and/or write queues, notifying anyone waiting. 1253 */ 1254 void 1255 ttyflush(tp, rw) 1256 register struct tty *tp; 1257 int rw; 1258 { 1259 register int s; 1260 1261 s = spltty(); 1262 #if 0 1263 again: 1264 #endif 1265 if (rw & FWRITE) { 1266 FLUSHQ(&tp->t_outq); 1267 CLR(tp->t_state, TS_TTSTOP); 1268 } 1269 (*tp->t_stop)(tp, rw); 1270 if (rw & FREAD) { 1271 FLUSHQ(&tp->t_canq); 1272 FLUSHQ(&tp->t_rawq); 1273 CLR(tp->t_lflag, PENDIN); 1274 tp->t_rocount = 0; 1275 tp->t_rocol = 0; 1276 CLR(tp->t_state, TS_LOCAL); 1277 ttwakeup(tp); 1278 if (ISSET(tp->t_state, TS_TBLOCK)) { 1279 if (rw & FWRITE) 1280 FLUSHQ(&tp->t_outq); 1281 ttyunblock(tp); 1282 1283 /* 1284 * Don't let leave any state that might clobber the 1285 * next line discipline (although we should do more 1286 * to send the START char). Not clearing the state 1287 * may have caused the "putc to a clist with no 1288 * reserved cblocks" panic/printf. 1289 */ 1290 CLR(tp->t_state, TS_TBLOCK); 1291 1292 #if 0 /* forget it, sleeping isn't always safe and we don't know when it is */ 1293 if (ISSET(tp->t_iflag, IXOFF)) { 1294 /* 1295 * XXX wait a bit in the hope that the stop 1296 * character (if any) will go out. Waiting 1297 * isn't good since it allows races. This 1298 * will be fixed when the stop character is 1299 * put in a special queue. Don't bother with 1300 * the checks in ttywait() since the timeout 1301 * will save us. 1302 */ 1303 SET(tp->t_state, TS_SO_OCOMPLETE); 1304 ttysleep(tp, TSA_OCOMPLETE(tp), TTOPRI, 1305 "ttyfls", hz / 10); 1306 /* 1307 * Don't try sending the stop character again. 1308 */ 1309 CLR(tp->t_state, TS_TBLOCK); 1310 goto again; 1311 } 1312 #endif 1313 } 1314 } 1315 if (rw & FWRITE) { 1316 FLUSHQ(&tp->t_outq); 1317 ttwwakeup(tp); 1318 } 1319 splx(s); 1320 } 1321 1322 /* 1323 * Copy in the default termios characters. 1324 */ 1325 void 1326 termioschars(t) 1327 struct termios *t; 1328 { 1329 1330 bcopy(ttydefchars, t->c_cc, sizeof t->c_cc); 1331 } 1332 1333 /* 1334 * Old interface. 1335 */ 1336 void 1337 ttychars(tp) 1338 struct tty *tp; 1339 { 1340 1341 termioschars(&tp->t_termios); 1342 } 1343 1344 /* 1345 * Handle input high water. Send stop character for the IXOFF case. Turn 1346 * on our input flow control bit and propagate the changes to the driver. 1347 * XXX the stop character should be put in a special high priority queue. 1348 */ 1349 void 1350 ttyblock(tp) 1351 struct tty *tp; 1352 { 1353 1354 SET(tp->t_state, TS_TBLOCK); 1355 if (ISSET(tp->t_iflag, IXOFF) && tp->t_cc[VSTOP] != _POSIX_VDISABLE && 1356 putc(tp->t_cc[VSTOP], &tp->t_outq) != 0) 1357 CLR(tp->t_state, TS_TBLOCK); /* try again later */ 1358 ttstart(tp); 1359 } 1360 1361 /* 1362 * Handle input low water. Send start character for the IXOFF case. Turn 1363 * off our input flow control bit and propagate the changes to the driver. 1364 * XXX the start character should be put in a special high priority queue. 1365 */ 1366 static void 1367 ttyunblock(tp) 1368 struct tty *tp; 1369 { 1370 1371 CLR(tp->t_state, TS_TBLOCK); 1372 if (ISSET(tp->t_iflag, IXOFF) && tp->t_cc[VSTART] != _POSIX_VDISABLE && 1373 putc(tp->t_cc[VSTART], &tp->t_outq) != 0) 1374 SET(tp->t_state, TS_TBLOCK); /* try again later */ 1375 ttstart(tp); 1376 } 1377 1378 #ifdef notyet 1379 /* Not used by any current (i386) drivers. */ 1380 /* 1381 * Restart after an inter-char delay. 1382 */ 1383 void 1384 ttrstrt(tp_arg) 1385 void *tp_arg; 1386 { 1387 struct tty *tp; 1388 int s; 1389 1390 KASSERT(tp_arg != NULL, ("ttrstrt")); 1391 1392 tp = tp_arg; 1393 s = spltty(); 1394 1395 CLR(tp->t_state, TS_TIMEOUT); 1396 ttstart(tp); 1397 1398 splx(s); 1399 } 1400 #endif 1401 1402 int 1403 ttstart(tp) 1404 struct tty *tp; 1405 { 1406 1407 if (tp->t_oproc != NULL) /* XXX: Kludge for pty. */ 1408 (*tp->t_oproc)(tp); 1409 return (0); 1410 } 1411 1412 /* 1413 * "close" a line discipline 1414 */ 1415 int 1416 ttylclose(tp, flag) 1417 struct tty *tp; 1418 int flag; 1419 { 1420 1421 if (flag & FNONBLOCK || ttywflush(tp)) 1422 ttyflush(tp, FREAD | FWRITE); 1423 return (0); 1424 } 1425 1426 /* 1427 * Handle modem control transition on a tty. 1428 * Flag indicates new state of carrier. 1429 * Returns 0 if the line should be turned off, otherwise 1. 1430 */ 1431 int 1432 ttymodem(tp, flag) 1433 register struct tty *tp; 1434 int flag; 1435 { 1436 1437 if (ISSET(tp->t_state, TS_CARR_ON) && ISSET(tp->t_cflag, MDMBUF)) { 1438 /* 1439 * MDMBUF: do flow control according to carrier flag 1440 * XXX TS_CAR_OFLOW doesn't do anything yet. TS_TTSTOP 1441 * works if IXON and IXANY are clear. 1442 */ 1443 if (flag) { 1444 CLR(tp->t_state, TS_CAR_OFLOW); 1445 CLR(tp->t_state, TS_TTSTOP); 1446 ttstart(tp); 1447 } else if (!ISSET(tp->t_state, TS_CAR_OFLOW)) { 1448 SET(tp->t_state, TS_CAR_OFLOW); 1449 SET(tp->t_state, TS_TTSTOP); 1450 (*tp->t_stop)(tp, 0); 1451 } 1452 } else if (flag == 0) { 1453 /* 1454 * Lost carrier. 1455 */ 1456 CLR(tp->t_state, TS_CARR_ON); 1457 if (ISSET(tp->t_state, TS_ISOPEN) && 1458 !ISSET(tp->t_cflag, CLOCAL)) { 1459 SET(tp->t_state, TS_ZOMBIE); 1460 CLR(tp->t_state, TS_CONNECTED); 1461 if (tp->t_session && tp->t_session->s_leader) 1462 psignal(tp->t_session->s_leader, SIGHUP); 1463 ttyflush(tp, FREAD | FWRITE); 1464 return (0); 1465 } 1466 } else { 1467 /* 1468 * Carrier now on. 1469 */ 1470 SET(tp->t_state, TS_CARR_ON); 1471 if (!ISSET(tp->t_state, TS_ZOMBIE)) 1472 SET(tp->t_state, TS_CONNECTED); 1473 wakeup(TSA_CARR_ON(tp)); 1474 ttwakeup(tp); 1475 ttwwakeup(tp); 1476 } 1477 return (1); 1478 } 1479 1480 /* 1481 * Reinput pending characters after state switch 1482 * call at spltty(). 1483 */ 1484 static void 1485 ttypend(tp) 1486 register struct tty *tp; 1487 { 1488 struct clist tq; 1489 register int c; 1490 1491 CLR(tp->t_lflag, PENDIN); 1492 SET(tp->t_state, TS_TYPEN); 1493 /* 1494 * XXX this assumes too much about clist internals. It may even 1495 * fail if the cblock slush pool is empty. We can't allocate more 1496 * cblocks here because we are called from an interrupt handler 1497 * and clist_alloc_cblocks() can wait. 1498 */ 1499 tq = tp->t_rawq; 1500 bzero(&tp->t_rawq, sizeof tp->t_rawq); 1501 tp->t_rawq.c_cbmax = tq.c_cbmax; 1502 tp->t_rawq.c_cbreserved = tq.c_cbreserved; 1503 while ((c = getc(&tq)) >= 0) 1504 ttyinput(c, tp); 1505 CLR(tp->t_state, TS_TYPEN); 1506 } 1507 1508 /* 1509 * Process a read call on a tty device. 1510 */ 1511 int 1512 ttread(tp, uio, flag) 1513 register struct tty *tp; 1514 struct uio *uio; 1515 int flag; 1516 { 1517 register struct clist *qp; 1518 register int c; 1519 register tcflag_t lflag; 1520 register cc_t *cc = tp->t_cc; 1521 register struct proc *p = curproc; 1522 int s, first, error = 0; 1523 int has_stime = 0, last_cc = 0; 1524 long slp = 0; /* XXX this should be renamed `timo'. */ 1525 struct timeval stime; 1526 1527 loop: 1528 s = spltty(); 1529 lflag = tp->t_lflag; 1530 /* 1531 * take pending input first 1532 */ 1533 if (ISSET(lflag, PENDIN)) { 1534 ttypend(tp); 1535 splx(s); /* reduce latency */ 1536 s = spltty(); 1537 lflag = tp->t_lflag; /* XXX ttypend() clobbers it */ 1538 } 1539 1540 /* 1541 * Hang process if it's in the background. 1542 */ 1543 if (isbackground(p, tp)) { 1544 splx(s); 1545 if (SIGISMEMBER(p->p_sigignore, SIGTTIN) || 1546 SIGISMEMBER(p->p_sigmask, SIGTTIN) || 1547 (p->p_flag & P_PPWAIT) || p->p_pgrp->pg_jobc == 0) 1548 return (EIO); 1549 pgsignal(p->p_pgrp, SIGTTIN, 1); 1550 error = ttysleep(tp, &lbolt, TTIPRI | PCATCH, "ttybg2", 0); 1551 if (error) 1552 return (error); 1553 goto loop; 1554 } 1555 1556 if (ISSET(tp->t_state, TS_ZOMBIE)) { 1557 splx(s); 1558 return (0); /* EOF */ 1559 } 1560 1561 /* 1562 * If canonical, use the canonical queue, 1563 * else use the raw queue. 1564 * 1565 * (should get rid of clists...) 1566 */ 1567 qp = ISSET(lflag, ICANON) ? &tp->t_canq : &tp->t_rawq; 1568 1569 if (flag & IO_NDELAY) { 1570 if (qp->c_cc > 0) 1571 goto read; 1572 if (!ISSET(lflag, ICANON) && cc[VMIN] == 0) { 1573 splx(s); 1574 return (0); 1575 } 1576 splx(s); 1577 return (EWOULDBLOCK); 1578 } 1579 if (!ISSET(lflag, ICANON)) { 1580 int m = cc[VMIN]; 1581 long t = cc[VTIME]; 1582 struct timeval timecopy; 1583 1584 /* 1585 * Check each of the four combinations. 1586 * (m > 0 && t == 0) is the normal read case. 1587 * It should be fairly efficient, so we check that and its 1588 * companion case (m == 0 && t == 0) first. 1589 * For the other two cases, we compute the target sleep time 1590 * into slp. 1591 */ 1592 if (t == 0) { 1593 if (qp->c_cc < m) 1594 goto sleep; 1595 if (qp->c_cc > 0) 1596 goto read; 1597 1598 /* m, t and qp->c_cc are all 0. 0 is enough input. */ 1599 splx(s); 1600 return (0); 1601 } 1602 t *= 100000; /* time in us */ 1603 #define diff(t1, t2) (((t1).tv_sec - (t2).tv_sec) * 1000000 + \ 1604 ((t1).tv_usec - (t2).tv_usec)) 1605 if (m > 0) { 1606 if (qp->c_cc <= 0) 1607 goto sleep; 1608 if (qp->c_cc >= m) 1609 goto read; 1610 getmicrotime(&timecopy); 1611 if (!has_stime) { 1612 /* first character, start timer */ 1613 has_stime = 1; 1614 stime = timecopy; 1615 slp = t; 1616 } else if (qp->c_cc > last_cc) { 1617 /* got a character, restart timer */ 1618 stime = timecopy; 1619 slp = t; 1620 } else { 1621 /* nothing, check expiration */ 1622 slp = t - diff(timecopy, stime); 1623 if (slp <= 0) 1624 goto read; 1625 } 1626 last_cc = qp->c_cc; 1627 } else { /* m == 0 */ 1628 if (qp->c_cc > 0) 1629 goto read; 1630 getmicrotime(&timecopy); 1631 if (!has_stime) { 1632 has_stime = 1; 1633 stime = timecopy; 1634 slp = t; 1635 } else { 1636 slp = t - diff(timecopy, stime); 1637 if (slp <= 0) { 1638 /* Timed out, but 0 is enough input. */ 1639 splx(s); 1640 return (0); 1641 } 1642 } 1643 } 1644 #undef diff 1645 /* 1646 * Rounding down may make us wake up just short 1647 * of the target, so we round up. 1648 * The formula is ceiling(slp * hz/1000000). 1649 * 32-bit arithmetic is enough for hz < 169. 1650 * XXX see tvtohz() for how to avoid overflow if hz 1651 * is large (divide by `tick' and/or arrange to 1652 * use tvtohz() if hz is large). 1653 */ 1654 slp = (long) (((u_long)slp * hz) + 999999) / 1000000; 1655 goto sleep; 1656 } 1657 if (qp->c_cc <= 0) { 1658 sleep: 1659 /* 1660 * There is no input, or not enough input and we can block. 1661 */ 1662 error = ttysleep(tp, TSA_HUP_OR_INPUT(tp), TTIPRI | PCATCH, 1663 ISSET(tp->t_state, TS_CONNECTED) ? 1664 "ttyin" : "ttyhup", (int)slp); 1665 splx(s); 1666 if (error == EWOULDBLOCK) 1667 error = 0; 1668 else if (error) 1669 return (error); 1670 /* 1671 * XXX what happens if another process eats some input 1672 * while we are asleep (not just here)? It would be 1673 * safest to detect changes and reset our state variables 1674 * (has_stime and last_cc). 1675 */ 1676 slp = 0; 1677 goto loop; 1678 } 1679 read: 1680 splx(s); 1681 /* 1682 * Input present, check for input mapping and processing. 1683 */ 1684 first = 1; 1685 if (ISSET(lflag, ICANON | ISIG)) 1686 goto slowcase; 1687 for (;;) { 1688 char ibuf[IBUFSIZ]; 1689 int icc; 1690 1691 icc = imin(uio->uio_resid, IBUFSIZ); 1692 icc = q_to_b(qp, ibuf, icc); 1693 if (icc <= 0) { 1694 if (first) 1695 goto loop; 1696 break; 1697 } 1698 error = uiomove(ibuf, icc, uio); 1699 /* 1700 * XXX if there was an error then we should ungetc() the 1701 * unmoved chars and reduce icc here. 1702 */ 1703 if (error) 1704 break; 1705 if (uio->uio_resid == 0) 1706 break; 1707 first = 0; 1708 } 1709 goto out; 1710 slowcase: 1711 for (;;) { 1712 c = getc(qp); 1713 if (c < 0) { 1714 if (first) 1715 goto loop; 1716 break; 1717 } 1718 /* 1719 * delayed suspend (^Y) 1720 */ 1721 if (CCEQ(cc[VDSUSP], c) && 1722 ISSET(lflag, IEXTEN | ISIG) == (IEXTEN | ISIG)) { 1723 pgsignal(tp->t_pgrp, SIGTSTP, 1); 1724 if (first) { 1725 error = ttysleep(tp, &lbolt, TTIPRI | PCATCH, 1726 "ttybg3", 0); 1727 if (error) 1728 break; 1729 goto loop; 1730 } 1731 break; 1732 } 1733 /* 1734 * Interpret EOF only in canonical mode. 1735 */ 1736 if (CCEQ(cc[VEOF], c) && ISSET(lflag, ICANON)) 1737 break; 1738 /* 1739 * Give user character. 1740 */ 1741 error = ureadc(c, uio); 1742 if (error) 1743 /* XXX should ungetc(c, qp). */ 1744 break; 1745 if (uio->uio_resid == 0) 1746 break; 1747 /* 1748 * In canonical mode check for a "break character" 1749 * marking the end of a "line of input". 1750 */ 1751 if (ISSET(lflag, ICANON) && TTBREAKC(c, lflag)) 1752 break; 1753 first = 0; 1754 } 1755 1756 out: 1757 /* 1758 * Look to unblock input now that (presumably) 1759 * the input queue has gone down. 1760 */ 1761 s = spltty(); 1762 if (ISSET(tp->t_state, TS_TBLOCK) && 1763 tp->t_rawq.c_cc + tp->t_canq.c_cc <= tp->t_ilowat) 1764 ttyunblock(tp); 1765 splx(s); 1766 1767 return (error); 1768 } 1769 1770 /* 1771 * Check the output queue on tp for space for a kernel message (from uprintf 1772 * or tprintf). Allow some space over the normal hiwater mark so we don't 1773 * lose messages due to normal flow control, but don't let the tty run amok. 1774 * Sleeps here are not interruptible, but we return prematurely if new signals 1775 * arrive. 1776 */ 1777 int 1778 ttycheckoutq(tp, wait) 1779 register struct tty *tp; 1780 int wait; 1781 { 1782 int hiwat, s; 1783 sigset_t oldmask; 1784 1785 hiwat = tp->t_ohiwat; 1786 SIGEMPTYSET(oldmask); 1787 s = spltty(); 1788 if (wait) 1789 oldmask = curproc->p_siglist; 1790 if (tp->t_outq.c_cc > hiwat + OBUFSIZ + 100) 1791 while (tp->t_outq.c_cc > hiwat) { 1792 ttstart(tp); 1793 if (tp->t_outq.c_cc <= hiwat) 1794 break; 1795 if (!(wait && SIGSETEQ(curproc->p_siglist, oldmask))) { 1796 splx(s); 1797 return (0); 1798 } 1799 SET(tp->t_state, TS_SO_OLOWAT); 1800 tsleep(TSA_OLOWAT(tp), PZERO - 1, "ttoutq", hz); 1801 } 1802 splx(s); 1803 return (1); 1804 } 1805 1806 /* 1807 * Process a write call on a tty device. 1808 */ 1809 int 1810 ttwrite(tp, uio, flag) 1811 register struct tty *tp; 1812 register struct uio *uio; 1813 int flag; 1814 { 1815 register char *cp = NULL; 1816 register int cc, ce; 1817 register struct proc *p; 1818 int i, hiwat, cnt, error, s; 1819 char obuf[OBUFSIZ]; 1820 1821 hiwat = tp->t_ohiwat; 1822 cnt = uio->uio_resid; 1823 error = 0; 1824 cc = 0; 1825 loop: 1826 s = spltty(); 1827 if (ISSET(tp->t_state, TS_ZOMBIE)) { 1828 splx(s); 1829 if (uio->uio_resid == cnt) 1830 error = EIO; 1831 goto out; 1832 } 1833 if (!ISSET(tp->t_state, TS_CONNECTED)) { 1834 if (flag & IO_NDELAY) { 1835 splx(s); 1836 error = EWOULDBLOCK; 1837 goto out; 1838 } 1839 error = ttysleep(tp, TSA_CARR_ON(tp), TTIPRI | PCATCH, 1840 "ttydcd", 0); 1841 splx(s); 1842 if (error) 1843 goto out; 1844 goto loop; 1845 } 1846 splx(s); 1847 /* 1848 * Hang the process if it's in the background. 1849 */ 1850 p = curproc; 1851 if (isbackground(p, tp) && 1852 ISSET(tp->t_lflag, TOSTOP) && !(p->p_flag & P_PPWAIT) && 1853 !SIGISMEMBER(p->p_sigignore, SIGTTOU) && 1854 !SIGISMEMBER(p->p_sigmask, SIGTTOU)) { 1855 if (p->p_pgrp->pg_jobc == 0) { 1856 error = EIO; 1857 goto out; 1858 } 1859 pgsignal(p->p_pgrp, SIGTTOU, 1); 1860 error = ttysleep(tp, &lbolt, TTIPRI | PCATCH, "ttybg4", 0); 1861 if (error) 1862 goto out; 1863 goto loop; 1864 } 1865 /* 1866 * Process the user's data in at most OBUFSIZ chunks. Perform any 1867 * output translation. Keep track of high water mark, sleep on 1868 * overflow awaiting device aid in acquiring new space. 1869 */ 1870 while (uio->uio_resid > 0 || cc > 0) { 1871 if (ISSET(tp->t_lflag, FLUSHO)) { 1872 uio->uio_resid = 0; 1873 return (0); 1874 } 1875 if (tp->t_outq.c_cc > hiwat) 1876 goto ovhiwat; 1877 /* 1878 * Grab a hunk of data from the user, unless we have some 1879 * leftover from last time. 1880 */ 1881 if (cc == 0) { 1882 cc = imin(uio->uio_resid, OBUFSIZ); 1883 cp = obuf; 1884 error = uiomove(cp, cc, uio); 1885 if (error) { 1886 cc = 0; 1887 break; 1888 } 1889 } 1890 /* 1891 * If nothing fancy need be done, grab those characters we 1892 * can handle without any of ttyoutput's processing and 1893 * just transfer them to the output q. For those chars 1894 * which require special processing (as indicated by the 1895 * bits in char_type), call ttyoutput. After processing 1896 * a hunk of data, look for FLUSHO so ^O's will take effect 1897 * immediately. 1898 */ 1899 while (cc > 0) { 1900 if (!ISSET(tp->t_oflag, OPOST)) 1901 ce = cc; 1902 else { 1903 ce = cc - scanc((u_int)cc, (u_char *)cp, 1904 char_type, CCLASSMASK); 1905 /* 1906 * If ce is zero, then we're processing 1907 * a special character through ttyoutput. 1908 */ 1909 if (ce == 0) { 1910 tp->t_rocount = 0; 1911 if (ttyoutput(*cp, tp) >= 0) { 1912 /* No Clists, wait a bit. */ 1913 ttstart(tp); 1914 if (flag & IO_NDELAY) { 1915 error = EWOULDBLOCK; 1916 goto out; 1917 } 1918 error = ttysleep(tp, &lbolt, 1919 TTOPRI|PCATCH, 1920 "ttybf1", 0); 1921 if (error) 1922 goto out; 1923 goto loop; 1924 } 1925 cp++; 1926 cc--; 1927 if (ISSET(tp->t_lflag, FLUSHO) || 1928 tp->t_outq.c_cc > hiwat) 1929 goto ovhiwat; 1930 continue; 1931 } 1932 } 1933 /* 1934 * A bunch of normal characters have been found. 1935 * Transfer them en masse to the output queue and 1936 * continue processing at the top of the loop. 1937 * If there are any further characters in this 1938 * <= OBUFSIZ chunk, the first should be a character 1939 * requiring special handling by ttyoutput. 1940 */ 1941 tp->t_rocount = 0; 1942 i = b_to_q(cp, ce, &tp->t_outq); 1943 ce -= i; 1944 tp->t_column += ce; 1945 cp += ce, cc -= ce, tk_nout += ce; 1946 tp->t_outcc += ce; 1947 if (i > 0) { 1948 /* No Clists, wait a bit. */ 1949 ttstart(tp); 1950 if (flag & IO_NDELAY) { 1951 error = EWOULDBLOCK; 1952 goto out; 1953 } 1954 error = ttysleep(tp, &lbolt, TTOPRI | PCATCH, 1955 "ttybf2", 0); 1956 if (error) 1957 goto out; 1958 goto loop; 1959 } 1960 if (ISSET(tp->t_lflag, FLUSHO) || 1961 tp->t_outq.c_cc > hiwat) 1962 break; 1963 } 1964 ttstart(tp); 1965 } 1966 out: 1967 /* 1968 * If cc is nonzero, we leave the uio structure inconsistent, as the 1969 * offset and iov pointers have moved forward, but it doesn't matter 1970 * (the call will either return short or restart with a new uio). 1971 */ 1972 uio->uio_resid += cc; 1973 return (error); 1974 1975 ovhiwat: 1976 ttstart(tp); 1977 s = spltty(); 1978 /* 1979 * This can only occur if FLUSHO is set in t_lflag, 1980 * or if ttstart/oproc is synchronous (or very fast). 1981 */ 1982 if (tp->t_outq.c_cc <= hiwat) { 1983 splx(s); 1984 goto loop; 1985 } 1986 if (flag & IO_NDELAY) { 1987 splx(s); 1988 uio->uio_resid += cc; 1989 return (uio->uio_resid == cnt ? EWOULDBLOCK : 0); 1990 } 1991 SET(tp->t_state, TS_SO_OLOWAT); 1992 error = ttysleep(tp, TSA_OLOWAT(tp), TTOPRI | PCATCH, "ttywri", 1993 tp->t_timeout); 1994 splx(s); 1995 if (error == EWOULDBLOCK) 1996 error = EIO; 1997 if (error) 1998 goto out; 1999 goto loop; 2000 } 2001 2002 /* 2003 * Rubout one character from the rawq of tp 2004 * as cleanly as possible. 2005 */ 2006 static void 2007 ttyrub(c, tp) 2008 register int c; 2009 register struct tty *tp; 2010 { 2011 register char *cp; 2012 register int savecol; 2013 int tabc, s; 2014 2015 if (!ISSET(tp->t_lflag, ECHO) || ISSET(tp->t_lflag, EXTPROC)) 2016 return; 2017 CLR(tp->t_lflag, FLUSHO); 2018 if (ISSET(tp->t_lflag, ECHOE)) { 2019 if (tp->t_rocount == 0) { 2020 /* 2021 * Screwed by ttwrite; retype 2022 */ 2023 ttyretype(tp); 2024 return; 2025 } 2026 if (c == ('\t' | TTY_QUOTE) || c == ('\n' | TTY_QUOTE)) 2027 ttyrubo(tp, 2); 2028 else { 2029 CLR(c, ~TTY_CHARMASK); 2030 switch (CCLASS(c)) { 2031 case ORDINARY: 2032 ttyrubo(tp, 1); 2033 break; 2034 case BACKSPACE: 2035 case CONTROL: 2036 case NEWLINE: 2037 case RETURN: 2038 case VTAB: 2039 if (ISSET(tp->t_lflag, ECHOCTL)) 2040 ttyrubo(tp, 2); 2041 break; 2042 case TAB: 2043 if (tp->t_rocount < tp->t_rawq.c_cc) { 2044 ttyretype(tp); 2045 return; 2046 } 2047 s = spltty(); 2048 savecol = tp->t_column; 2049 SET(tp->t_state, TS_CNTTB); 2050 SET(tp->t_lflag, FLUSHO); 2051 tp->t_column = tp->t_rocol; 2052 cp = tp->t_rawq.c_cf; 2053 if (cp) 2054 tabc = *cp; /* XXX FIX NEXTC */ 2055 for (; cp; cp = nextc(&tp->t_rawq, cp, &tabc)) 2056 ttyecho(tabc, tp); 2057 CLR(tp->t_lflag, FLUSHO); 2058 CLR(tp->t_state, TS_CNTTB); 2059 splx(s); 2060 2061 /* savecol will now be length of the tab. */ 2062 savecol -= tp->t_column; 2063 tp->t_column += savecol; 2064 if (savecol > 8) 2065 savecol = 8; /* overflow screw */ 2066 while (--savecol >= 0) 2067 (void)ttyoutput('\b', tp); 2068 break; 2069 default: /* XXX */ 2070 #define PANICSTR "ttyrub: would panic c = %d, val = %d\n" 2071 (void)printf(PANICSTR, c, CCLASS(c)); 2072 #ifdef notdef 2073 panic(PANICSTR, c, CCLASS(c)); 2074 #endif 2075 } 2076 } 2077 } else if (ISSET(tp->t_lflag, ECHOPRT)) { 2078 if (!ISSET(tp->t_state, TS_ERASE)) { 2079 SET(tp->t_state, TS_ERASE); 2080 (void)ttyoutput('\\', tp); 2081 } 2082 ttyecho(c, tp); 2083 } else { 2084 ttyecho(tp->t_cc[VERASE], tp); 2085 /* 2086 * This code may be executed not only when an ERASE key 2087 * is pressed, but also when ^U (KILL) or ^W (WERASE) are. 2088 * So, I didn't think it was worthwhile to pass the extra 2089 * information (which would need an extra parameter, 2090 * changing every call) needed to distinguish the ERASE2 2091 * case from the ERASE. 2092 */ 2093 } 2094 --tp->t_rocount; 2095 } 2096 2097 /* 2098 * Back over cnt characters, erasing them. 2099 */ 2100 static void 2101 ttyrubo(tp, cnt) 2102 register struct tty *tp; 2103 int cnt; 2104 { 2105 2106 while (cnt-- > 0) { 2107 (void)ttyoutput('\b', tp); 2108 (void)ttyoutput(' ', tp); 2109 (void)ttyoutput('\b', tp); 2110 } 2111 } 2112 2113 /* 2114 * ttyretype -- 2115 * Reprint the rawq line. Note, it is assumed that c_cc has already 2116 * been checked. 2117 */ 2118 static void 2119 ttyretype(tp) 2120 register struct tty *tp; 2121 { 2122 register char *cp; 2123 int s, c; 2124 2125 /* Echo the reprint character. */ 2126 if (tp->t_cc[VREPRINT] != _POSIX_VDISABLE) 2127 ttyecho(tp->t_cc[VREPRINT], tp); 2128 2129 (void)ttyoutput('\n', tp); 2130 2131 /* 2132 * XXX 2133 * FIX: NEXTC IS BROKEN - DOESN'T CHECK QUOTE 2134 * BIT OF FIRST CHAR. 2135 */ 2136 s = spltty(); 2137 for (cp = tp->t_canq.c_cf, c = (cp != NULL ? *cp : 0); 2138 cp != NULL; cp = nextc(&tp->t_canq, cp, &c)) 2139 ttyecho(c, tp); 2140 for (cp = tp->t_rawq.c_cf, c = (cp != NULL ? *cp : 0); 2141 cp != NULL; cp = nextc(&tp->t_rawq, cp, &c)) 2142 ttyecho(c, tp); 2143 CLR(tp->t_state, TS_ERASE); 2144 splx(s); 2145 2146 tp->t_rocount = tp->t_rawq.c_cc; 2147 tp->t_rocol = 0; 2148 } 2149 2150 /* 2151 * Echo a typed character to the terminal. 2152 */ 2153 static void 2154 ttyecho(c, tp) 2155 register int c; 2156 register struct tty *tp; 2157 { 2158 2159 if (!ISSET(tp->t_state, TS_CNTTB)) 2160 CLR(tp->t_lflag, FLUSHO); 2161 if ((!ISSET(tp->t_lflag, ECHO) && 2162 (c != '\n' || !ISSET(tp->t_lflag, ECHONL))) || 2163 ISSET(tp->t_lflag, EXTPROC)) 2164 return; 2165 if (ISSET(tp->t_lflag, ECHOCTL) && 2166 ((ISSET(c, TTY_CHARMASK) <= 037 && c != '\t' && c != '\n') || 2167 ISSET(c, TTY_CHARMASK) == 0177)) { 2168 (void)ttyoutput('^', tp); 2169 CLR(c, ~TTY_CHARMASK); 2170 if (c == 0177) 2171 c = '?'; 2172 else 2173 c += 'A' - 1; 2174 } 2175 (void)ttyoutput(c, tp); 2176 } 2177 2178 /* 2179 * Wake up any readers on a tty. 2180 */ 2181 void 2182 ttwakeup(tp) 2183 register struct tty *tp; 2184 { 2185 2186 if (tp->t_rsel.si_pid != 0) 2187 selwakeup(&tp->t_rsel); 2188 if (ISSET(tp->t_state, TS_ASYNC) && tp->t_sigio != NULL) 2189 pgsigio(tp->t_sigio, SIGIO, (tp->t_session != NULL)); 2190 wakeup(TSA_HUP_OR_INPUT(tp)); 2191 KNOTE(&tp->t_rsel.si_note, 0); 2192 } 2193 2194 /* 2195 * Wake up any writers on a tty. 2196 */ 2197 void 2198 ttwwakeup(tp) 2199 register struct tty *tp; 2200 { 2201 2202 if (tp->t_wsel.si_pid != 0 && tp->t_outq.c_cc <= tp->t_olowat) 2203 selwakeup(&tp->t_wsel); 2204 if (ISSET(tp->t_state, TS_ASYNC) && tp->t_sigio != NULL) 2205 pgsigio(tp->t_sigio, SIGIO, (tp->t_session != NULL)); 2206 if (ISSET(tp->t_state, TS_BUSY | TS_SO_OCOMPLETE) == 2207 TS_SO_OCOMPLETE && tp->t_outq.c_cc == 0) { 2208 CLR(tp->t_state, TS_SO_OCOMPLETE); 2209 wakeup(TSA_OCOMPLETE(tp)); 2210 } 2211 if (ISSET(tp->t_state, TS_SO_OLOWAT) && 2212 tp->t_outq.c_cc <= tp->t_olowat) { 2213 CLR(tp->t_state, TS_SO_OLOWAT); 2214 wakeup(TSA_OLOWAT(tp)); 2215 } 2216 KNOTE(&tp->t_wsel.si_note, 0); 2217 } 2218 2219 /* 2220 * Look up a code for a specified speed in a conversion table; 2221 * used by drivers to map software speed values to hardware parameters. 2222 */ 2223 int 2224 ttspeedtab(speed, table) 2225 int speed; 2226 register struct speedtab *table; 2227 { 2228 2229 for ( ; table->sp_speed != -1; table++) 2230 if (table->sp_speed == speed) 2231 return (table->sp_code); 2232 return (-1); 2233 } 2234 2235 /* 2236 * Set input and output watermarks and buffer sizes. For input, the 2237 * high watermark is about one second's worth of input above empty, the 2238 * low watermark is slightly below high water, and the buffer size is a 2239 * driver-dependent amount above high water. For output, the watermarks 2240 * are near the ends of the buffer, with about 1 second's worth of input 2241 * between them. All this only applies to the standard line discipline. 2242 */ 2243 void 2244 ttsetwater(tp) 2245 struct tty *tp; 2246 { 2247 register int cps, ttmaxhiwat, x; 2248 2249 /* Input. */ 2250 clist_alloc_cblocks(&tp->t_canq, TTYHOG, 512); 2251 switch (tp->t_ispeedwat) { 2252 case (speed_t)-1: 2253 cps = tp->t_ispeed / 10; 2254 break; 2255 case 0: 2256 /* 2257 * This case is for old drivers that don't know about 2258 * t_ispeedwat. Arrange for them to get the old buffer 2259 * sizes and watermarks. 2260 */ 2261 cps = TTYHOG - 2 * 256; 2262 tp->t_ififosize = 2 * 256; 2263 break; 2264 default: 2265 cps = tp->t_ispeedwat / 10; 2266 break; 2267 } 2268 tp->t_ihiwat = cps; 2269 tp->t_ilowat = 7 * cps / 8; 2270 x = cps + tp->t_ififosize; 2271 clist_alloc_cblocks(&tp->t_rawq, x, x); 2272 2273 /* Output. */ 2274 switch (tp->t_ospeedwat) { 2275 case (speed_t)-1: 2276 cps = tp->t_ospeed / 10; 2277 ttmaxhiwat = 2 * TTMAXHIWAT; 2278 break; 2279 case 0: 2280 cps = tp->t_ospeed / 10; 2281 ttmaxhiwat = TTMAXHIWAT; 2282 break; 2283 default: 2284 cps = tp->t_ospeedwat / 10; 2285 ttmaxhiwat = 8 * TTMAXHIWAT; 2286 break; 2287 } 2288 #define CLAMP(x, h, l) ((x) > h ? h : ((x) < l) ? l : (x)) 2289 tp->t_olowat = x = CLAMP(cps / 2, TTMAXLOWAT, TTMINLOWAT); 2290 x += cps; 2291 x = CLAMP(x, ttmaxhiwat, TTMINHIWAT); /* XXX clamps are too magic */ 2292 tp->t_ohiwat = roundup(x, CBSIZE); /* XXX for compat */ 2293 x = imax(tp->t_ohiwat, TTMAXHIWAT); /* XXX for compat/safety */ 2294 x += OBUFSIZ + 100; 2295 clist_alloc_cblocks(&tp->t_outq, x, x); 2296 #undef CLAMP 2297 } 2298 2299 /* 2300 * Report on state of foreground process group. 2301 */ 2302 void 2303 ttyinfo(tp) 2304 register struct tty *tp; 2305 { 2306 register struct proc *p, *pick; 2307 struct timeval utime, stime; 2308 int tmp; 2309 2310 if (ttycheckoutq(tp,0) == 0) 2311 return; 2312 2313 /* Print load average. */ 2314 tmp = (averunnable.ldavg[0] * 100 + FSCALE / 2) >> FSHIFT; 2315 ttyprintf(tp, "load: %d.%02d ", tmp / 100, tmp % 100); 2316 2317 if (tp->t_session == NULL) 2318 ttyprintf(tp, "not a controlling terminal\n"); 2319 else if (tp->t_pgrp == NULL) 2320 ttyprintf(tp, "no foreground process group\n"); 2321 else if ((p = LIST_FIRST(&tp->t_pgrp->pg_members)) == 0) 2322 ttyprintf(tp, "empty foreground process group\n"); 2323 else { 2324 /* Pick interesting process. */ 2325 for (pick = NULL; p != 0; p = LIST_NEXT(p, p_pglist)) 2326 if (proc_compare(pick, p)) 2327 pick = p; 2328 2329 ttyprintf(tp, " cmd: %s %d [%s] ", pick->p_comm, pick->p_pid, 2330 pick->p_stat == SRUN ? "running" : 2331 pick->p_wmesg ? pick->p_wmesg : "iowait"); 2332 2333 if (pick->p_flag & P_INMEM) { 2334 calcru(pick, &utime, &stime, NULL); 2335 2336 /* Print user time. */ 2337 ttyprintf(tp, "%ld.%02ldu ", 2338 utime.tv_sec, utime.tv_usec / 10000); 2339 2340 /* Print system time. */ 2341 ttyprintf(tp, "%ld.%02lds ", 2342 stime.tv_sec, stime.tv_usec / 10000); 2343 } else 2344 ttyprintf(tp, "?.??u ?.??s "); 2345 2346 /* Print percentage cpu, resident set size. */ 2347 tmp = (pick->p_pctcpu * 10000 + FSCALE / 2) >> FSHIFT; 2348 ttyprintf(tp, "%d%% %ldk\n", 2349 tmp / 100, 2350 pick->p_stat == SIDL || pick->p_stat == SZOMB ? 0 : 2351 (long)pgtok(vmspace_resident_count(pick->p_vmspace))); 2352 } 2353 tp->t_rocount = 0; /* so pending input will be retyped if BS */ 2354 } 2355 2356 /* 2357 * Returns 1 if p2 is "better" than p1 2358 * 2359 * The algorithm for picking the "interesting" process is thus: 2360 * 2361 * 1) Only foreground processes are eligible - implied. 2362 * 2) Runnable processes are favored over anything else. The runner 2363 * with the highest cpu utilization is picked (p_estcpu). Ties are 2364 * broken by picking the highest pid. 2365 * 3) The sleeper with the shortest sleep time is next. With ties, 2366 * we pick out just "short-term" sleepers (P_SINTR == 0). 2367 * 4) Further ties are broken by picking the highest pid. 2368 */ 2369 #define ISRUN(p) (((p)->p_stat == SRUN) || ((p)->p_stat == SIDL)) 2370 #define TESTAB(a, b) ((a)<<1 | (b)) 2371 #define ONLYA 2 2372 #define ONLYB 1 2373 #define BOTH 3 2374 2375 static int 2376 proc_compare(p1, p2) 2377 register struct proc *p1, *p2; 2378 { 2379 2380 if (p1 == NULL) 2381 return (1); 2382 /* 2383 * see if at least one of them is runnable 2384 */ 2385 switch (TESTAB(ISRUN(p1), ISRUN(p2))) { 2386 case ONLYA: 2387 return (0); 2388 case ONLYB: 2389 return (1); 2390 case BOTH: 2391 /* 2392 * tie - favor one with highest recent cpu utilization 2393 */ 2394 if (p2->p_estcpu > p1->p_estcpu) 2395 return (1); 2396 if (p1->p_estcpu > p2->p_estcpu) 2397 return (0); 2398 return (p2->p_pid > p1->p_pid); /* tie - return highest pid */ 2399 } 2400 /* 2401 * weed out zombies 2402 */ 2403 switch (TESTAB(p1->p_stat == SZOMB, p2->p_stat == SZOMB)) { 2404 case ONLYA: 2405 return (1); 2406 case ONLYB: 2407 return (0); 2408 case BOTH: 2409 return (p2->p_pid > p1->p_pid); /* tie - return highest pid */ 2410 } 2411 /* 2412 * pick the one with the smallest sleep time 2413 */ 2414 if (p2->p_slptime > p1->p_slptime) 2415 return (0); 2416 if (p1->p_slptime > p2->p_slptime) 2417 return (1); 2418 /* 2419 * favor one sleeping in a non-interruptible sleep 2420 */ 2421 if (p1->p_flag & P_SINTR && (p2->p_flag & P_SINTR) == 0) 2422 return (1); 2423 if (p2->p_flag & P_SINTR && (p1->p_flag & P_SINTR) == 0) 2424 return (0); 2425 return (p2->p_pid > p1->p_pid); /* tie - return highest pid */ 2426 } 2427 2428 /* 2429 * Output char to tty; console putchar style. 2430 */ 2431 int 2432 tputchar(c, tp) 2433 int c; 2434 struct tty *tp; 2435 { 2436 register int s; 2437 2438 s = spltty(); 2439 if (!ISSET(tp->t_state, TS_CONNECTED)) { 2440 splx(s); 2441 return (-1); 2442 } 2443 if (c == '\n') 2444 (void)ttyoutput('\r', tp); 2445 (void)ttyoutput(c, tp); 2446 ttstart(tp); 2447 splx(s); 2448 return (0); 2449 } 2450 2451 /* 2452 * Sleep on chan, returning ERESTART if tty changed while we napped and 2453 * returning any errors (e.g. EINTR/EWOULDBLOCK) reported by tsleep. If 2454 * the tty is revoked, restarting a pending call will redo validation done 2455 * at the start of the call. 2456 */ 2457 int 2458 ttysleep(tp, chan, pri, wmesg, timo) 2459 struct tty *tp; 2460 void *chan; 2461 int pri, timo; 2462 char *wmesg; 2463 { 2464 int error; 2465 int gen; 2466 2467 gen = tp->t_gen; 2468 error = tsleep(chan, pri, wmesg, timo); 2469 if (error) 2470 return (error); 2471 return (tp->t_gen == gen ? 0 : ERESTART); 2472 } 2473 2474 /* 2475 * Allocate a tty struct. Clists in the struct will be allocated by 2476 * ttyopen(). 2477 */ 2478 struct tty * 2479 ttymalloc(tp) 2480 struct tty *tp; 2481 { 2482 2483 if (tp) 2484 return(tp); 2485 tp = malloc(sizeof *tp, M_TTYS, M_WAITOK); 2486 bzero(tp, sizeof *tp); 2487 ttyregister(tp); 2488 return (tp); 2489 } 2490 2491 #if 0 /* XXX not yet usable: session leader holds a ref (see kern_exit.c). */ 2492 /* 2493 * Free a tty struct. Clists in the struct should have been freed by 2494 * ttyclose(). 2495 */ 2496 void 2497 ttyfree(tp) 2498 struct tty *tp; 2499 { 2500 free(tp, M_TTYS); 2501 } 2502 #endif /* 0 */ 2503 2504 void 2505 ttyregister(tp) 2506 struct tty *tp; 2507 { 2508 SLIST_INSERT_HEAD(&tty_list, tp, t_list); 2509 } 2510 2511 static int 2512 sysctl_kern_ttys(SYSCTL_HANDLER_ARGS) 2513 { 2514 int error; 2515 struct tty *tp, t; 2516 SLIST_FOREACH(tp, &tty_list, t_list) { 2517 t = *tp; 2518 if (t.t_dev) 2519 t.t_dev = (dev_t)dev2udev(t.t_dev); 2520 error = SYSCTL_OUT(req, (caddr_t)&t, sizeof(t)); 2521 if (error) 2522 return (error); 2523 } 2524 return (0); 2525 } 2526 2527 SYSCTL_PROC(_kern, OID_AUTO, ttys, CTLTYPE_OPAQUE|CTLFLAG_RD, 2528 0, 0, sysctl_kern_ttys, "S,tty", "All struct ttys"); 2529 2530 void 2531 nottystop(tp, rw) 2532 struct tty *tp; 2533 int rw; 2534 { 2535 2536 return; 2537 } 2538 2539 int 2540 ttyread(dev, uio, flag) 2541 dev_t dev; 2542 struct uio *uio; 2543 int flag; 2544 { 2545 struct tty *tp; 2546 2547 tp = dev->si_tty; 2548 if (tp == NULL) 2549 return (ENODEV); 2550 return ((*linesw[tp->t_line].l_read)(tp, uio, flag)); 2551 } 2552 2553 int 2554 ttywrite(dev, uio, flag) 2555 dev_t dev; 2556 struct uio *uio; 2557 int flag; 2558 { 2559 struct tty *tp; 2560 2561 tp = dev->si_tty; 2562 if (tp == NULL) 2563 return (ENODEV); 2564 return ((*linesw[tp->t_line].l_write)(tp, uio, flag)); 2565 }
Cache object: 9e9c70c508c5d8d9e7c94bc75789807c
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