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 "snp.h" 71 #include "opt_compat.h" 72 #include "opt_uconsole.h" 73 74 #include <sys/param.h> 75 #include <sys/systm.h> 76 #include <sys/filio.h> 77 #if defined(COMPAT_43) || defined(COMPAT_SUNOS) 78 #include <sys/ioctl_compat.h> 79 #endif 80 #include <sys/proc.h> 81 #define TTYDEFCHARS 82 #include <sys/tty.h> 83 #undef TTYDEFCHARS 84 #include <sys/fcntl.h> 85 #include <sys/conf.h> 86 #include <sys/dkstat.h> 87 #include <sys/poll.h> 88 #include <sys/kernel.h> 89 #include <sys/vnode.h> 90 #include <sys/signalvar.h> 91 #include <sys/resourcevar.h> 92 #include <sys/malloc.h> 93 #include <sys/filedesc.h> 94 #if NSNP > 0 95 #include <sys/snoop.h> 96 #endif 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)); 115 116 /* 117 * Table with character classes and parity. The 8th bit indicates parity, 118 * the 7th bit indicates the character is an alphameric or underscore (for 119 * ALTWERASE), and the low 6 bits indicate delay type. If the low 6 bits 120 * are 0 then the character needs no special processing on output; classes 121 * other than 0 might be translated or (not currently) require delays. 122 */ 123 #define E 0x00 /* Even parity. */ 124 #define O 0x80 /* Odd parity. */ 125 #define PARITY(c) (char_type[c] & O) 126 127 #define ALPHA 0x40 /* Alpha or underscore. */ 128 #define ISALPHA(c) (char_type[(c) & TTY_CHARMASK] & ALPHA) 129 130 #define CCLASSMASK 0x3f 131 #define CCLASS(c) (char_type[c] & CCLASSMASK) 132 133 #define BS BACKSPACE 134 #define CC CONTROL 135 #define CR RETURN 136 #define NA ORDINARY | ALPHA 137 #define NL NEWLINE 138 #define NO ORDINARY 139 #define TB TAB 140 #define VT VTAB 141 142 static u_char const char_type[] = { 143 E|CC, O|CC, O|CC, E|CC, O|CC, E|CC, E|CC, O|CC, /* nul - bel */ 144 O|BS, E|TB, E|NL, O|CC, E|VT, O|CR, O|CC, E|CC, /* bs - si */ 145 O|CC, E|CC, E|CC, O|CC, E|CC, O|CC, O|CC, E|CC, /* dle - etb */ 146 E|CC, O|CC, O|CC, E|CC, O|CC, E|CC, E|CC, O|CC, /* can - us */ 147 O|NO, E|NO, E|NO, O|NO, E|NO, O|NO, O|NO, E|NO, /* sp - ' */ 148 E|NO, O|NO, O|NO, E|NO, O|NO, E|NO, E|NO, O|NO, /* ( - / */ 149 E|NA, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* 0 - 7 */ 150 O|NA, E|NA, E|NO, O|NO, E|NO, O|NO, O|NO, E|NO, /* 8 - ? */ 151 O|NO, E|NA, E|NA, O|NA, E|NA, O|NA, O|NA, E|NA, /* @ - G */ 152 E|NA, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* H - O */ 153 E|NA, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* P - W */ 154 O|NA, E|NA, E|NA, O|NO, E|NO, O|NO, O|NO, O|NA, /* X - _ */ 155 E|NO, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* ` - g */ 156 O|NA, E|NA, E|NA, O|NA, E|NA, O|NA, O|NA, E|NA, /* h - o */ 157 O|NA, E|NA, E|NA, O|NA, E|NA, O|NA, O|NA, E|NA, /* p - w */ 158 E|NA, O|NA, O|NA, E|NO, O|NO, E|NO, E|NO, O|CC, /* x - del */ 159 /* 160 * Meta chars; should be settable per character set; 161 * for now, treat them all as normal characters. 162 */ 163 NA, NA, NA, NA, NA, NA, NA, NA, 164 NA, NA, NA, NA, NA, NA, NA, NA, 165 NA, NA, NA, NA, NA, NA, NA, NA, 166 NA, NA, NA, NA, NA, NA, NA, NA, 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 }; 180 #undef BS 181 #undef CC 182 #undef CR 183 #undef NA 184 #undef NL 185 #undef NO 186 #undef TB 187 #undef VT 188 189 /* Macros to clear/set/test flags. */ 190 #define SET(t, f) (t) |= (f) 191 #define CLR(t, f) (t) &= ~(f) 192 #define ISSET(t, f) ((t) & (f)) 193 194 #undef MAX_INPUT /* XXX wrong in <sys/syslimits.h> */ 195 #define MAX_INPUT TTYHOG /* XXX limit is usually larger for !ICANON */ 196 197 /* 198 * Initial open of tty, or (re)entry to standard tty line discipline. 199 */ 200 int 201 ttyopen(device, tp) 202 dev_t device; 203 register struct tty *tp; 204 { 205 int s; 206 207 s = spltty(); 208 tp->t_dev = device; 209 if (!ISSET(tp->t_state, TS_ISOPEN)) { 210 SET(tp->t_state, TS_ISOPEN); 211 if (ISSET(tp->t_cflag, CLOCAL)) 212 SET(tp->t_state, TS_CONNECTED); 213 bzero(&tp->t_winsize, sizeof(tp->t_winsize)); 214 } 215 ttsetwater(tp); 216 splx(s); 217 return (0); 218 } 219 220 /* 221 * Handle close() on a tty line: flush and set to initial state, 222 * bumping generation number so that pending read/write calls 223 * can detect recycling of the tty. 224 * XXX our caller should have done `spltty(); l_close(); ttyclose();' 225 * and l_close() should have flushed, but we repeat the spltty() and 226 * the flush in case there are buggy callers. 227 */ 228 int 229 ttyclose(tp) 230 register struct tty *tp; 231 { 232 int s; 233 234 funsetown(tp->t_sigio); 235 s = spltty(); 236 if (constty == tp) 237 constty = NULL; 238 239 ttyflush(tp, FREAD | FWRITE); 240 clist_free_cblocks(&tp->t_canq); 241 clist_free_cblocks(&tp->t_outq); 242 clist_free_cblocks(&tp->t_rawq); 243 244 #if NSNP > 0 245 if (ISSET(tp->t_state, TS_SNOOP) && tp->t_sc != NULL) 246 snpdown((struct snoop *)tp->t_sc); 247 #endif 248 249 tp->t_gen++; 250 tp->t_line = TTYDISC; 251 tp->t_pgrp = NULL; 252 tp->t_session = NULL; 253 tp->t_state = 0; 254 splx(s); 255 return (0); 256 } 257 258 #define FLUSHQ(q) { \ 259 if ((q)->c_cc) \ 260 ndflush(q, (q)->c_cc); \ 261 } 262 263 /* Is 'c' a line delimiter ("break" character)? */ 264 #define TTBREAKC(c, lflag) \ 265 ((c) == '\n' || (((c) == cc[VEOF] || \ 266 (c) == cc[VEOL] || ((c) == cc[VEOL2] && lflag & IEXTEN)) && \ 267 (c) != _POSIX_VDISABLE)) 268 269 /* 270 * Process input of a single character received on a tty. 271 */ 272 int 273 ttyinput(c, tp) 274 register int c; 275 register struct tty *tp; 276 { 277 register tcflag_t iflag, lflag; 278 register cc_t *cc; 279 int i, err; 280 281 /* 282 * If input is pending take it first. 283 */ 284 lflag = tp->t_lflag; 285 if (ISSET(lflag, PENDIN)) 286 ttypend(tp); 287 /* 288 * Gather stats. 289 */ 290 if (ISSET(lflag, ICANON)) { 291 ++tk_cancc; 292 ++tp->t_cancc; 293 } else { 294 ++tk_rawcc; 295 ++tp->t_rawcc; 296 } 297 ++tk_nin; 298 299 /* 300 * Block further input iff: 301 * current input > threshold AND input is available to user program 302 * AND input flow control is enabled and not yet invoked. 303 * The 3 is slop for PARMRK. 304 */ 305 iflag = tp->t_iflag; 306 if (tp->t_rawq.c_cc + tp->t_canq.c_cc > tp->t_ihiwat - 3 && 307 (!ISSET(lflag, ICANON) || tp->t_canq.c_cc != 0) && 308 (ISSET(tp->t_cflag, CRTS_IFLOW) || ISSET(iflag, IXOFF)) && 309 !ISSET(tp->t_state, TS_TBLOCK)) 310 ttyblock(tp); 311 312 /* Handle exceptional conditions (break, parity, framing). */ 313 cc = tp->t_cc; 314 err = (ISSET(c, TTY_ERRORMASK)); 315 if (err) { 316 CLR(c, TTY_ERRORMASK); 317 if (ISSET(err, TTY_BI)) { 318 if (ISSET(iflag, IGNBRK)) 319 return (0); 320 if (ISSET(iflag, BRKINT)) { 321 ttyflush(tp, FREAD | FWRITE); 322 pgsignal(tp->t_pgrp, SIGINT, 1); 323 goto endcase; 324 } 325 if (ISSET(iflag, PARMRK)) 326 goto parmrk; 327 } else if ((ISSET(err, TTY_PE) && ISSET(iflag, INPCK)) 328 || ISSET(err, TTY_FE)) { 329 if (ISSET(iflag, IGNPAR)) 330 return (0); 331 else if (ISSET(iflag, PARMRK)) { 332 parmrk: 333 if (tp->t_rawq.c_cc + tp->t_canq.c_cc > 334 MAX_INPUT - 3) 335 goto input_overflow; 336 (void)putc(0377 | TTY_QUOTE, &tp->t_rawq); 337 (void)putc(0 | TTY_QUOTE, &tp->t_rawq); 338 (void)putc(c | TTY_QUOTE, &tp->t_rawq); 339 goto endcase; 340 } else 341 c = 0; 342 } 343 } 344 345 if (!ISSET(tp->t_state, TS_TYPEN) && ISSET(iflag, ISTRIP)) 346 CLR(c, 0x80); 347 if (!ISSET(lflag, EXTPROC)) { 348 /* 349 * Check for literal nexting very first 350 */ 351 if (ISSET(tp->t_state, TS_LNCH)) { 352 SET(c, TTY_QUOTE); 353 CLR(tp->t_state, TS_LNCH); 354 } 355 /* 356 * Scan for special characters. This code 357 * is really just a big case statement with 358 * non-constant cases. The bottom of the 359 * case statement is labeled ``endcase'', so goto 360 * it after a case match, or similar. 361 */ 362 363 /* 364 * Control chars which aren't controlled 365 * by ICANON, ISIG, or IXON. 366 */ 367 if (ISSET(lflag, IEXTEN)) { 368 if (CCEQ(cc[VLNEXT], c)) { 369 if (ISSET(lflag, ECHO)) { 370 if (ISSET(lflag, ECHOE)) { 371 (void)ttyoutput('^', tp); 372 (void)ttyoutput('\b', tp); 373 } else 374 ttyecho(c, tp); 375 } 376 SET(tp->t_state, TS_LNCH); 377 goto endcase; 378 } 379 if (CCEQ(cc[VDISCARD], c)) { 380 if (ISSET(lflag, FLUSHO)) 381 CLR(tp->t_lflag, FLUSHO); 382 else { 383 ttyflush(tp, FWRITE); 384 ttyecho(c, tp); 385 if (tp->t_rawq.c_cc + tp->t_canq.c_cc) 386 ttyretype(tp); 387 SET(tp->t_lflag, FLUSHO); 388 } 389 goto startoutput; 390 } 391 } 392 /* 393 * Signals. 394 */ 395 if (ISSET(lflag, ISIG)) { 396 if (CCEQ(cc[VINTR], c) || CCEQ(cc[VQUIT], c)) { 397 if (!ISSET(lflag, NOFLSH)) 398 ttyflush(tp, FREAD | FWRITE); 399 ttyecho(c, tp); 400 pgsignal(tp->t_pgrp, 401 CCEQ(cc[VINTR], c) ? SIGINT : SIGQUIT, 1); 402 goto endcase; 403 } 404 if (CCEQ(cc[VSUSP], c)) { 405 if (!ISSET(lflag, NOFLSH)) 406 ttyflush(tp, FREAD); 407 ttyecho(c, tp); 408 pgsignal(tp->t_pgrp, SIGTSTP, 1); 409 goto endcase; 410 } 411 } 412 /* 413 * Handle start/stop characters. 414 */ 415 if (ISSET(iflag, IXON)) { 416 if (CCEQ(cc[VSTOP], c)) { 417 if (!ISSET(tp->t_state, TS_TTSTOP)) { 418 SET(tp->t_state, TS_TTSTOP); 419 #ifdef sun4c /* XXX */ 420 (*tp->t_stop)(tp, 0); 421 #else 422 (*cdevsw[major(tp->t_dev)]->d_stop)(tp, 423 0); 424 #endif 425 return (0); 426 } 427 if (!CCEQ(cc[VSTART], c)) 428 return (0); 429 /* 430 * if VSTART == VSTOP then toggle 431 */ 432 goto endcase; 433 } 434 if (CCEQ(cc[VSTART], c)) 435 goto restartoutput; 436 } 437 /* 438 * IGNCR, ICRNL, & INLCR 439 */ 440 if (c == '\r') { 441 if (ISSET(iflag, IGNCR)) 442 return (0); 443 else if (ISSET(iflag, ICRNL)) 444 c = '\n'; 445 } else if (c == '\n' && ISSET(iflag, INLCR)) 446 c = '\r'; 447 } 448 if (!ISSET(tp->t_lflag, EXTPROC) && ISSET(lflag, ICANON)) { 449 /* 450 * From here on down canonical mode character 451 * processing takes place. 452 */ 453 /* 454 * erase (^H / ^?) 455 */ 456 if (CCEQ(cc[VERASE], c)) { 457 if (tp->t_rawq.c_cc) 458 ttyrub(unputc(&tp->t_rawq), tp); 459 goto endcase; 460 } 461 /* 462 * kill (^U) 463 */ 464 if (CCEQ(cc[VKILL], c)) { 465 if (ISSET(lflag, ECHOKE) && 466 tp->t_rawq.c_cc == tp->t_rocount && 467 !ISSET(lflag, ECHOPRT)) 468 while (tp->t_rawq.c_cc) 469 ttyrub(unputc(&tp->t_rawq), tp); 470 else { 471 ttyecho(c, tp); 472 if (ISSET(lflag, ECHOK) || 473 ISSET(lflag, ECHOKE)) 474 ttyecho('\n', tp); 475 FLUSHQ(&tp->t_rawq); 476 tp->t_rocount = 0; 477 } 478 CLR(tp->t_state, TS_LOCAL); 479 goto endcase; 480 } 481 /* 482 * word erase (^W) 483 */ 484 if (CCEQ(cc[VWERASE], c) && ISSET(lflag, IEXTEN)) { 485 int ctype; 486 487 /* 488 * erase whitespace 489 */ 490 while ((c = unputc(&tp->t_rawq)) == ' ' || c == '\t') 491 ttyrub(c, tp); 492 if (c == -1) 493 goto endcase; 494 /* 495 * erase last char of word and remember the 496 * next chars type (for ALTWERASE) 497 */ 498 ttyrub(c, tp); 499 c = unputc(&tp->t_rawq); 500 if (c == -1) 501 goto endcase; 502 if (c == ' ' || c == '\t') { 503 (void)putc(c, &tp->t_rawq); 504 goto endcase; 505 } 506 ctype = ISALPHA(c); 507 /* 508 * erase rest of word 509 */ 510 do { 511 ttyrub(c, tp); 512 c = unputc(&tp->t_rawq); 513 if (c == -1) 514 goto endcase; 515 } while (c != ' ' && c != '\t' && 516 (!ISSET(lflag, ALTWERASE) || ISALPHA(c) == ctype)); 517 (void)putc(c, &tp->t_rawq); 518 goto endcase; 519 } 520 /* 521 * reprint line (^R) 522 */ 523 if (CCEQ(cc[VREPRINT], c) && ISSET(lflag, IEXTEN)) { 524 ttyretype(tp); 525 goto endcase; 526 } 527 /* 528 * ^T - kernel info and generate SIGINFO 529 */ 530 if (CCEQ(cc[VSTATUS], c) && ISSET(lflag, IEXTEN)) { 531 if (ISSET(lflag, ISIG)) 532 pgsignal(tp->t_pgrp, SIGINFO, 1); 533 if (!ISSET(lflag, NOKERNINFO)) 534 ttyinfo(tp); 535 goto endcase; 536 } 537 } 538 /* 539 * Check for input buffer overflow 540 */ 541 if (tp->t_rawq.c_cc + tp->t_canq.c_cc >= MAX_INPUT) { 542 input_overflow: 543 if (ISSET(iflag, IMAXBEL)) { 544 if (tp->t_outq.c_cc < tp->t_ohiwat) 545 (void)ttyoutput(CTRL('g'), tp); 546 } 547 goto endcase; 548 } 549 550 if ( c == 0377 && ISSET(iflag, PARMRK) && !ISSET(iflag, ISTRIP) 551 && ISSET(iflag, IGNBRK|IGNPAR) != (IGNBRK|IGNPAR)) 552 (void)putc(0377 | TTY_QUOTE, &tp->t_rawq); 553 554 /* 555 * Put data char in q for user and 556 * wakeup on seeing a line delimiter. 557 */ 558 if (putc(c, &tp->t_rawq) >= 0) { 559 if (!ISSET(lflag, ICANON)) { 560 ttwakeup(tp); 561 ttyecho(c, tp); 562 goto endcase; 563 } 564 if (TTBREAKC(c, lflag)) { 565 tp->t_rocount = 0; 566 catq(&tp->t_rawq, &tp->t_canq); 567 ttwakeup(tp); 568 } else if (tp->t_rocount++ == 0) 569 tp->t_rocol = tp->t_column; 570 if (ISSET(tp->t_state, TS_ERASE)) { 571 /* 572 * end of prterase \.../ 573 */ 574 CLR(tp->t_state, TS_ERASE); 575 (void)ttyoutput('/', tp); 576 } 577 i = tp->t_column; 578 ttyecho(c, tp); 579 if (CCEQ(cc[VEOF], c) && ISSET(lflag, ECHO)) { 580 /* 581 * Place the cursor over the '^' of the ^D. 582 */ 583 i = imin(2, tp->t_column - i); 584 while (i > 0) { 585 (void)ttyoutput('\b', tp); 586 i--; 587 } 588 } 589 } 590 endcase: 591 /* 592 * IXANY means allow any character to restart output. 593 */ 594 if (ISSET(tp->t_state, TS_TTSTOP) && 595 !ISSET(iflag, IXANY) && cc[VSTART] != cc[VSTOP]) 596 return (0); 597 restartoutput: 598 CLR(tp->t_lflag, FLUSHO); 599 CLR(tp->t_state, TS_TTSTOP); 600 startoutput: 601 return (ttstart(tp)); 602 } 603 604 /* 605 * Output a single character on a tty, doing output processing 606 * as needed (expanding tabs, newline processing, etc.). 607 * Returns < 0 if succeeds, otherwise returns char to resend. 608 * Must be recursive. 609 */ 610 static int 611 ttyoutput(c, tp) 612 register int c; 613 register struct tty *tp; 614 { 615 register tcflag_t oflag; 616 register int col, s; 617 618 oflag = tp->t_oflag; 619 if (!ISSET(oflag, OPOST)) { 620 if (ISSET(tp->t_lflag, FLUSHO)) 621 return (-1); 622 if (putc(c, &tp->t_outq)) 623 return (c); 624 tk_nout++; 625 tp->t_outcc++; 626 return (-1); 627 } 628 /* 629 * Do tab expansion if OXTABS is set. Special case if we external 630 * processing, we don't do the tab expansion because we'll probably 631 * get it wrong. If tab expansion needs to be done, let it happen 632 * externally. 633 */ 634 CLR(c, ~TTY_CHARMASK); 635 if (c == '\t' && 636 ISSET(oflag, OXTABS) && !ISSET(tp->t_lflag, EXTPROC)) { 637 c = 8 - (tp->t_column & 7); 638 if (!ISSET(tp->t_lflag, FLUSHO)) { 639 s = spltty(); /* Don't interrupt tabs. */ 640 c -= b_to_q(" ", c, &tp->t_outq); 641 tk_nout += c; 642 tp->t_outcc += c; 643 splx(s); 644 } 645 tp->t_column += c; 646 return (c ? -1 : '\t'); 647 } 648 if (c == CEOT && ISSET(oflag, ONOEOT)) 649 return (-1); 650 651 /* 652 * Newline translation: if ONLCR is set, 653 * translate newline into "\r\n". 654 */ 655 if (c == '\n' && ISSET(tp->t_oflag, ONLCR)) { 656 tk_nout++; 657 tp->t_outcc++; 658 if (putc('\r', &tp->t_outq)) 659 return (c); 660 } 661 tk_nout++; 662 tp->t_outcc++; 663 if (!ISSET(tp->t_lflag, FLUSHO) && putc(c, &tp->t_outq)) 664 return (c); 665 666 col = tp->t_column; 667 switch (CCLASS(c)) { 668 case BACKSPACE: 669 if (col > 0) 670 --col; 671 break; 672 case CONTROL: 673 break; 674 case NEWLINE: 675 case RETURN: 676 col = 0; 677 break; 678 case ORDINARY: 679 ++col; 680 break; 681 case TAB: 682 col = (col + 8) & ~7; 683 break; 684 } 685 tp->t_column = col; 686 return (-1); 687 } 688 689 /* 690 * Ioctls for all tty devices. Called after line-discipline specific ioctl 691 * has been called to do discipline-specific functions and/or reject any 692 * of these ioctl commands. 693 */ 694 /* ARGSUSED */ 695 int 696 ttioctl(tp, cmd, data, flag) 697 register struct tty *tp; 698 u_long cmd; 699 int flag; 700 void *data; 701 { 702 register struct proc *p; 703 int s, error; 704 705 p = curproc; /* XXX */ 706 707 /* If the ioctl involves modification, hang if in the background. */ 708 switch (cmd) { 709 case TIOCCBRK: 710 case TIOCCONS: 711 case TIOCDRAIN: 712 case TIOCEXCL: 713 case TIOCFLUSH: 714 #ifdef TIOCHPCL 715 case TIOCHPCL: 716 #endif 717 case TIOCNXCL: 718 case TIOCSBRK: 719 case TIOCSCTTY: 720 case TIOCSDRAINWAIT: 721 case TIOCSETA: 722 case TIOCSETAF: 723 case TIOCSETAW: 724 case TIOCSETD: 725 case TIOCSPGRP: 726 case TIOCSTART: 727 case TIOCSTAT: 728 case TIOCSTI: 729 case TIOCSTOP: 730 case TIOCSWINSZ: 731 #if defined(COMPAT_43) || defined(COMPAT_SUNOS) 732 case TIOCLBIC: 733 case TIOCLBIS: 734 case TIOCLSET: 735 case TIOCSETC: 736 case OTIOCSETD: 737 case TIOCSETN: 738 case TIOCSETP: 739 case TIOCSLTC: 740 #endif 741 while (isbackground(p, tp) && 742 (p->p_flag & P_PPWAIT) == 0 && 743 (p->p_sigignore & sigmask(SIGTTOU)) == 0 && 744 (p->p_sigmask & sigmask(SIGTTOU)) == 0) { 745 if (p->p_pgrp->pg_jobc == 0) 746 return (EIO); 747 pgsignal(p->p_pgrp, SIGTTOU, 1); 748 error = ttysleep(tp, &lbolt, TTOPRI | PCATCH, "ttybg1", 749 0); 750 if (error) 751 return (error); 752 } 753 break; 754 } 755 756 switch (cmd) { /* Process the ioctl. */ 757 case FIOASYNC: /* set/clear async i/o */ 758 s = spltty(); 759 if (*(int *)data) 760 SET(tp->t_state, TS_ASYNC); 761 else 762 CLR(tp->t_state, TS_ASYNC); 763 splx(s); 764 break; 765 case FIONBIO: /* set/clear non-blocking i/o */ 766 break; /* XXX: delete. */ 767 case FIONREAD: /* get # bytes to read */ 768 s = spltty(); 769 *(int *)data = ttnread(tp); 770 splx(s); 771 break; 772 773 case FIOSETOWN: 774 /* 775 * Policy -- Don't allow FIOSETOWN on someone else's 776 * controlling tty 777 */ 778 if (tp->t_session != NULL && !isctty(p, tp)) 779 return (ENOTTY); 780 781 error = fsetown(*(int *)data, &tp->t_sigio); 782 if (error) 783 return (error); 784 break; 785 case FIOGETOWN: 786 if (tp->t_session != NULL && !isctty(p, tp)) 787 return (ENOTTY); 788 *(int *)data = fgetown(tp->t_sigio); 789 break; 790 791 case TIOCEXCL: /* set exclusive use of tty */ 792 s = spltty(); 793 SET(tp->t_state, TS_XCLUDE); 794 splx(s); 795 break; 796 case TIOCFLUSH: { /* flush buffers */ 797 register int flags = *(int *)data; 798 799 if (flags == 0) 800 flags = FREAD | FWRITE; 801 else 802 flags &= FREAD | FWRITE; 803 ttyflush(tp, flags); 804 break; 805 } 806 case TIOCCONS: /* become virtual console */ 807 if (*(int *)data) { 808 if (constty && constty != tp && 809 ISSET(constty->t_state, TS_CONNECTED)) 810 return (EBUSY); 811 #ifndef UCONSOLE 812 if (error = suser(p->p_ucred, &p->p_acflag)) 813 return (error); 814 #endif 815 constty = tp; 816 } else if (tp == constty) 817 constty = NULL; 818 break; 819 case TIOCDRAIN: /* wait till output drained */ 820 error = ttywait(tp); 821 if (error) 822 return (error); 823 break; 824 case TIOCGETA: { /* get termios struct */ 825 struct termios *t = (struct termios *)data; 826 827 bcopy(&tp->t_termios, t, sizeof(struct termios)); 828 break; 829 } 830 case TIOCGETD: /* get line discipline */ 831 *(int *)data = tp->t_line; 832 break; 833 case TIOCGWINSZ: /* get window size */ 834 *(struct winsize *)data = tp->t_winsize; 835 break; 836 case TIOCGPGRP: /* get pgrp of tty */ 837 if (!isctty(p, tp)) 838 return (ENOTTY); 839 *(int *)data = tp->t_pgrp ? tp->t_pgrp->pg_id : NO_PID; 840 break; 841 #ifdef TIOCHPCL 842 case TIOCHPCL: /* hang up on last close */ 843 s = spltty(); 844 SET(tp->t_cflag, HUPCL); 845 splx(s); 846 break; 847 #endif 848 case TIOCNXCL: /* reset exclusive use of tty */ 849 s = spltty(); 850 CLR(tp->t_state, TS_XCLUDE); 851 splx(s); 852 break; 853 case TIOCOUTQ: /* output queue size */ 854 *(int *)data = tp->t_outq.c_cc; 855 break; 856 case TIOCSETA: /* set termios struct */ 857 case TIOCSETAW: /* drain output, set */ 858 case TIOCSETAF: { /* drn out, fls in, set */ 859 register struct termios *t = (struct termios *)data; 860 861 if (t->c_ispeed == 0) 862 t->c_ispeed = t->c_ospeed; 863 if (t->c_ispeed == 0) 864 t->c_ispeed = tp->t_ospeed; 865 if (t->c_ispeed == 0) 866 return (EINVAL); 867 s = spltty(); 868 if (cmd == TIOCSETAW || cmd == TIOCSETAF) { 869 error = ttywait(tp); 870 if (error) { 871 splx(s); 872 return (error); 873 } 874 if (cmd == TIOCSETAF) 875 ttyflush(tp, FREAD); 876 } 877 if (!ISSET(t->c_cflag, CIGNORE)) { 878 /* 879 * Set device hardware. 880 */ 881 if (tp->t_param && (error = (*tp->t_param)(tp, t))) { 882 splx(s); 883 return (error); 884 } 885 if (ISSET(t->c_cflag, CLOCAL) && 886 !ISSET(tp->t_cflag, CLOCAL)) { 887 /* 888 * XXX disconnections would be too hard to 889 * get rid of without this kludge. The only 890 * way to get rid of controlling terminals 891 * is to exit from the session leader. 892 */ 893 CLR(tp->t_state, TS_ZOMBIE); 894 895 wakeup(TSA_CARR_ON(tp)); 896 ttwakeup(tp); 897 ttwwakeup(tp); 898 } 899 if ((ISSET(tp->t_state, TS_CARR_ON) || 900 ISSET(t->c_cflag, CLOCAL)) && 901 !ISSET(tp->t_state, TS_ZOMBIE)) 902 SET(tp->t_state, TS_CONNECTED); 903 else 904 CLR(tp->t_state, TS_CONNECTED); 905 tp->t_cflag = t->c_cflag; 906 tp->t_ispeed = t->c_ispeed; 907 if (t->c_ospeed != 0) 908 tp->t_ospeed = t->c_ospeed; 909 ttsetwater(tp); 910 } 911 if (ISSET(t->c_lflag, ICANON) != ISSET(tp->t_lflag, ICANON) && 912 cmd != TIOCSETAF) { 913 if (ISSET(t->c_lflag, ICANON)) 914 SET(tp->t_lflag, PENDIN); 915 else { 916 /* 917 * XXX we really shouldn't allow toggling 918 * ICANON while we're in a non-termios line 919 * discipline. Now we have to worry about 920 * panicing for a null queue. 921 */ 922 if (tp->t_canq.c_cbreserved > 0 && 923 tp->t_rawq.c_cbreserved > 0) { 924 catq(&tp->t_rawq, &tp->t_canq); 925 /* 926 * XXX the queue limits may be 927 * different, so the old queue 928 * swapping method no longer works. 929 */ 930 catq(&tp->t_canq, &tp->t_rawq); 931 } 932 CLR(tp->t_lflag, PENDIN); 933 } 934 ttwakeup(tp); 935 } 936 tp->t_iflag = t->c_iflag; 937 tp->t_oflag = t->c_oflag; 938 /* 939 * Make the EXTPROC bit read only. 940 */ 941 if (ISSET(tp->t_lflag, EXTPROC)) 942 SET(t->c_lflag, EXTPROC); 943 else 944 CLR(t->c_lflag, EXTPROC); 945 tp->t_lflag = t->c_lflag | ISSET(tp->t_lflag, PENDIN); 946 if (t->c_cc[VMIN] != tp->t_cc[VMIN] || 947 t->c_cc[VTIME] != tp->t_cc[VTIME]) 948 ttwakeup(tp); 949 bcopy(t->c_cc, tp->t_cc, sizeof(t->c_cc)); 950 splx(s); 951 break; 952 } 953 case TIOCSETD: { /* set line discipline */ 954 register int t = *(int *)data; 955 dev_t device = tp->t_dev; 956 957 if ((u_int)t >= nlinesw) 958 return (ENXIO); 959 if (t != tp->t_line) { 960 s = spltty(); 961 (*linesw[tp->t_line].l_close)(tp, flag); 962 error = (*linesw[t].l_open)(device, tp); 963 if (error) { 964 (void)(*linesw[tp->t_line].l_open)(device, tp); 965 splx(s); 966 return (error); 967 } 968 tp->t_line = t; 969 splx(s); 970 } 971 break; 972 } 973 case TIOCSTART: /* start output, like ^Q */ 974 s = spltty(); 975 if (ISSET(tp->t_state, TS_TTSTOP) || 976 ISSET(tp->t_lflag, FLUSHO)) { 977 CLR(tp->t_lflag, FLUSHO); 978 CLR(tp->t_state, TS_TTSTOP); 979 ttstart(tp); 980 } 981 splx(s); 982 break; 983 case TIOCSTI: /* simulate terminal input */ 984 if (p->p_ucred->cr_uid && (flag & FREAD) == 0) 985 return (EPERM); 986 if (p->p_ucred->cr_uid && !isctty(p, tp)) 987 return (EACCES); 988 s = spltty(); 989 (*linesw[tp->t_line].l_rint)(*(u_char *)data, tp); 990 splx(s); 991 break; 992 case TIOCSTOP: /* stop output, like ^S */ 993 s = spltty(); 994 if (!ISSET(tp->t_state, TS_TTSTOP)) { 995 SET(tp->t_state, TS_TTSTOP); 996 #ifdef sun4c /* XXX */ 997 (*tp->t_stop)(tp, 0); 998 #else 999 (*cdevsw[major(tp->t_dev)]->d_stop)(tp, 0); 1000 #endif 1001 } 1002 splx(s); 1003 break; 1004 case TIOCSCTTY: /* become controlling tty */ 1005 /* Session ctty vnode pointer set in vnode layer. */ 1006 if (!SESS_LEADER(p) || 1007 ((p->p_session->s_ttyvp || tp->t_session) && 1008 (tp->t_session != p->p_session))) 1009 return (EPERM); 1010 tp->t_session = p->p_session; 1011 tp->t_pgrp = p->p_pgrp; 1012 p->p_session->s_ttyp = tp; 1013 p->p_flag |= P_CONTROLT; 1014 break; 1015 case TIOCSPGRP: { /* set pgrp of tty */ 1016 register struct pgrp *pgrp = pgfind(*(int *)data); 1017 1018 if (!isctty(p, tp)) 1019 return (ENOTTY); 1020 else if (pgrp == NULL || pgrp->pg_session != p->p_session) 1021 return (EPERM); 1022 tp->t_pgrp = pgrp; 1023 break; 1024 } 1025 case TIOCSTAT: /* simulate control-T */ 1026 s = spltty(); 1027 ttyinfo(tp); 1028 splx(s); 1029 break; 1030 case TIOCSWINSZ: /* set window size */ 1031 if (bcmp((caddr_t)&tp->t_winsize, data, 1032 sizeof (struct winsize))) { 1033 tp->t_winsize = *(struct winsize *)data; 1034 pgsignal(tp->t_pgrp, SIGWINCH, 1); 1035 } 1036 break; 1037 case TIOCSDRAINWAIT: 1038 error = suser(p->p_ucred, &p->p_acflag); 1039 if (error) 1040 return (error); 1041 tp->t_timeout = *(int *)data * hz; 1042 wakeup(TSA_OCOMPLETE(tp)); 1043 wakeup(TSA_OLOWAT(tp)); 1044 break; 1045 case TIOCGDRAINWAIT: 1046 *(int *)data = tp->t_timeout / hz; 1047 break; 1048 default: 1049 #if defined(COMPAT_43) || defined(COMPAT_SUNOS) 1050 return (ttcompat(tp, cmd, data, flag)); 1051 #else 1052 return (ENOIOCTL); 1053 #endif 1054 } 1055 return (0); 1056 } 1057 1058 int 1059 ttypoll(tp, events, p) 1060 struct tty *tp; 1061 int events; 1062 struct proc *p; 1063 { 1064 int s; 1065 int revents = 0; 1066 1067 if (tp == NULL) /* XXX used to return ENXIO, but that means true! */ 1068 return ((events & (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM)) 1069 | POLLHUP); 1070 1071 s = spltty(); 1072 if (events & (POLLIN | POLLRDNORM)) 1073 if (ttnread(tp) > 0 || ISSET(tp->t_state, TS_ZOMBIE)) 1074 revents |= events & (POLLIN | POLLRDNORM); 1075 else 1076 selrecord(p, &tp->t_rsel); 1077 1078 if (events & (POLLOUT | POLLWRNORM)) 1079 if ((tp->t_outq.c_cc <= tp->t_olowat && 1080 ISSET(tp->t_state, TS_CONNECTED)) 1081 || ISSET(tp->t_state, TS_ZOMBIE)) 1082 revents |= events & (POLLOUT | POLLWRNORM); 1083 else 1084 selrecord(p, &tp->t_wsel); 1085 splx(s); 1086 return (revents); 1087 } 1088 1089 /* 1090 * This is a wrapper for compatibility with the select vector used by 1091 * cdevsw. It relies on a proper xxxdevtotty routine. 1092 */ 1093 int 1094 ttpoll(dev, events, p) 1095 dev_t dev; 1096 int events; 1097 struct proc *p; 1098 { 1099 return ttypoll((*cdevsw[major(dev)]->d_devtotty)(dev), events, p); 1100 } 1101 1102 /* 1103 * Must be called at spltty(). 1104 */ 1105 static int 1106 ttnread(tp) 1107 struct tty *tp; 1108 { 1109 int nread; 1110 1111 if (ISSET(tp->t_lflag, PENDIN)) 1112 ttypend(tp); 1113 nread = tp->t_canq.c_cc; 1114 if (!ISSET(tp->t_lflag, ICANON)) { 1115 nread += tp->t_rawq.c_cc; 1116 if (nread < tp->t_cc[VMIN] && tp->t_cc[VTIME] == 0) 1117 nread = 0; 1118 } 1119 return (nread); 1120 } 1121 1122 /* 1123 * Wait for output to drain. 1124 */ 1125 int 1126 ttywait(tp) 1127 register struct tty *tp; 1128 { 1129 int error, s; 1130 1131 error = 0; 1132 s = spltty(); 1133 while ((tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY)) && 1134 ISSET(tp->t_state, TS_CONNECTED) && tp->t_oproc) { 1135 (*tp->t_oproc)(tp); 1136 if ((tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY)) && 1137 ISSET(tp->t_state, TS_CONNECTED)) { 1138 SET(tp->t_state, TS_SO_OCOMPLETE); 1139 error = ttysleep(tp, TSA_OCOMPLETE(tp), 1140 TTOPRI | PCATCH, "ttywai", 1141 tp->t_timeout); 1142 if (error) { 1143 if (error == EWOULDBLOCK) 1144 error = EIO; 1145 break; 1146 } 1147 } else 1148 break; 1149 } 1150 if (!error && (tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY))) 1151 error = EIO; 1152 splx(s); 1153 return (error); 1154 } 1155 1156 /* 1157 * Flush if successfully wait. 1158 */ 1159 static int 1160 ttywflush(tp) 1161 struct tty *tp; 1162 { 1163 int error; 1164 1165 if ((error = ttywait(tp)) == 0) 1166 ttyflush(tp, FREAD); 1167 return (error); 1168 } 1169 1170 /* 1171 * Flush tty read and/or write queues, notifying anyone waiting. 1172 */ 1173 void 1174 ttyflush(tp, rw) 1175 register struct tty *tp; 1176 int rw; 1177 { 1178 register int s; 1179 1180 s = spltty(); 1181 #if 0 1182 again: 1183 #endif 1184 if (rw & FWRITE) { 1185 FLUSHQ(&tp->t_outq); 1186 CLR(tp->t_state, TS_TTSTOP); 1187 } 1188 #ifdef sun4c /* XXX */ 1189 (*tp->t_stop)(tp, rw); 1190 #else 1191 (*cdevsw[major(tp->t_dev)]->d_stop)(tp, rw); 1192 #endif 1193 if (rw & FREAD) { 1194 FLUSHQ(&tp->t_canq); 1195 FLUSHQ(&tp->t_rawq); 1196 CLR(tp->t_lflag, PENDIN); 1197 tp->t_rocount = 0; 1198 tp->t_rocol = 0; 1199 CLR(tp->t_state, TS_LOCAL); 1200 ttwakeup(tp); 1201 if (ISSET(tp->t_state, TS_TBLOCK)) { 1202 if (rw & FWRITE) 1203 FLUSHQ(&tp->t_outq); 1204 ttyunblock(tp); 1205 1206 /* 1207 * Don't let leave any state that might clobber the 1208 * next line discipline (although we should do more 1209 * to send the START char). Not clearing the state 1210 * may have caused the "putc to a clist with no 1211 * reserved cblocks" panic/printf. 1212 */ 1213 CLR(tp->t_state, TS_TBLOCK); 1214 1215 #if 0 /* forget it, sleeping isn't always safe and we don't know when it is */ 1216 if (ISSET(tp->t_iflag, IXOFF)) { 1217 /* 1218 * XXX wait a bit in the hope that the stop 1219 * character (if any) will go out. Waiting 1220 * isn't good since it allows races. This 1221 * will be fixed when the stop character is 1222 * put in a special queue. Don't bother with 1223 * the checks in ttywait() since the timeout 1224 * will save us. 1225 */ 1226 SET(tp->t_state, TS_SO_OCOMPLETE); 1227 ttysleep(tp, TSA_OCOMPLETE(tp), TTOPRI, 1228 "ttyfls", hz / 10); 1229 /* 1230 * Don't try sending the stop character again. 1231 */ 1232 CLR(tp->t_state, TS_TBLOCK); 1233 goto again; 1234 } 1235 #endif 1236 } 1237 } 1238 if (rw & FWRITE) { 1239 FLUSHQ(&tp->t_outq); 1240 ttwwakeup(tp); 1241 } 1242 splx(s); 1243 } 1244 1245 /* 1246 * Copy in the default termios characters. 1247 */ 1248 void 1249 termioschars(t) 1250 struct termios *t; 1251 { 1252 1253 bcopy(ttydefchars, t->c_cc, sizeof t->c_cc); 1254 } 1255 1256 /* 1257 * Old interface. 1258 */ 1259 void 1260 ttychars(tp) 1261 struct tty *tp; 1262 { 1263 1264 termioschars(&tp->t_termios); 1265 } 1266 1267 /* 1268 * Handle input high water. Send stop character for the IXOFF case. Turn 1269 * on our input flow control bit and propagate the changes to the driver. 1270 * XXX the stop character should be put in a special high priority queue. 1271 */ 1272 void 1273 ttyblock(tp) 1274 struct tty *tp; 1275 { 1276 1277 SET(tp->t_state, TS_TBLOCK); 1278 if (ISSET(tp->t_iflag, IXOFF) && tp->t_cc[VSTOP] != _POSIX_VDISABLE && 1279 putc(tp->t_cc[VSTOP], &tp->t_outq) != 0) 1280 CLR(tp->t_state, TS_TBLOCK); /* try again later */ 1281 ttstart(tp); 1282 } 1283 1284 /* 1285 * Handle input low water. Send start character for the IXOFF case. Turn 1286 * off our input flow control bit and propagate the changes to the driver. 1287 * XXX the start character should be put in a special high priority queue. 1288 */ 1289 static void 1290 ttyunblock(tp) 1291 struct tty *tp; 1292 { 1293 1294 CLR(tp->t_state, TS_TBLOCK); 1295 if (ISSET(tp->t_iflag, IXOFF) && tp->t_cc[VSTART] != _POSIX_VDISABLE && 1296 putc(tp->t_cc[VSTART], &tp->t_outq) != 0) 1297 SET(tp->t_state, TS_TBLOCK); /* try again later */ 1298 ttstart(tp); 1299 } 1300 1301 #ifdef notyet 1302 /* Not used by any current (i386) drivers. */ 1303 /* 1304 * Restart after an inter-char delay. 1305 */ 1306 void 1307 ttrstrt(tp_arg) 1308 void *tp_arg; 1309 { 1310 struct tty *tp; 1311 int s; 1312 1313 KASSERT(tp_arg != NULL, ("ttrstrt")); 1314 1315 tp = tp_arg; 1316 s = spltty(); 1317 1318 CLR(tp->t_state, TS_TIMEOUT); 1319 ttstart(tp); 1320 1321 splx(s); 1322 } 1323 #endif 1324 1325 int 1326 ttstart(tp) 1327 struct tty *tp; 1328 { 1329 1330 if (tp->t_oproc != NULL) /* XXX: Kludge for pty. */ 1331 (*tp->t_oproc)(tp); 1332 return (0); 1333 } 1334 1335 /* 1336 * "close" a line discipline 1337 */ 1338 int 1339 ttylclose(tp, flag) 1340 struct tty *tp; 1341 int flag; 1342 { 1343 1344 if (flag & FNONBLOCK || ttywflush(tp)) 1345 ttyflush(tp, FREAD | FWRITE); 1346 return (0); 1347 } 1348 1349 /* 1350 * Handle modem control transition on a tty. 1351 * Flag indicates new state of carrier. 1352 * Returns 0 if the line should be turned off, otherwise 1. 1353 */ 1354 int 1355 ttymodem(tp, flag) 1356 register struct tty *tp; 1357 int flag; 1358 { 1359 1360 if (ISSET(tp->t_state, TS_CARR_ON) && ISSET(tp->t_cflag, MDMBUF)) { 1361 /* 1362 * MDMBUF: do flow control according to carrier flag 1363 * XXX TS_CAR_OFLOW doesn't do anything yet. TS_TTSTOP 1364 * works if IXON and IXANY are clear. 1365 */ 1366 if (flag) { 1367 CLR(tp->t_state, TS_CAR_OFLOW); 1368 CLR(tp->t_state, TS_TTSTOP); 1369 ttstart(tp); 1370 } else if (!ISSET(tp->t_state, TS_CAR_OFLOW)) { 1371 SET(tp->t_state, TS_CAR_OFLOW); 1372 SET(tp->t_state, TS_TTSTOP); 1373 #ifdef sun4c /* XXX */ 1374 (*tp->t_stop)(tp, 0); 1375 #else 1376 (*cdevsw[major(tp->t_dev)]->d_stop)(tp, 0); 1377 #endif 1378 } 1379 } else if (flag == 0) { 1380 /* 1381 * Lost carrier. 1382 */ 1383 CLR(tp->t_state, TS_CARR_ON); 1384 if (ISSET(tp->t_state, TS_ISOPEN) && 1385 !ISSET(tp->t_cflag, CLOCAL)) { 1386 SET(tp->t_state, TS_ZOMBIE); 1387 CLR(tp->t_state, TS_CONNECTED); 1388 if (tp->t_session && tp->t_session->s_leader) 1389 psignal(tp->t_session->s_leader, SIGHUP); 1390 ttyflush(tp, FREAD | FWRITE); 1391 return (0); 1392 } 1393 } else { 1394 /* 1395 * Carrier now on. 1396 */ 1397 SET(tp->t_state, TS_CARR_ON); 1398 if (!ISSET(tp->t_state, TS_ZOMBIE)) 1399 SET(tp->t_state, TS_CONNECTED); 1400 wakeup(TSA_CARR_ON(tp)); 1401 ttwakeup(tp); 1402 ttwwakeup(tp); 1403 } 1404 return (1); 1405 } 1406 1407 /* 1408 * Reinput pending characters after state switch 1409 * call at spltty(). 1410 */ 1411 static void 1412 ttypend(tp) 1413 register struct tty *tp; 1414 { 1415 struct clist tq; 1416 register int c; 1417 1418 CLR(tp->t_lflag, PENDIN); 1419 SET(tp->t_state, TS_TYPEN); 1420 /* 1421 * XXX this assumes too much about clist internals. It may even 1422 * fail if the cblock slush pool is empty. We can't allocate more 1423 * cblocks here because we are called from an interrupt handler 1424 * and clist_alloc_cblocks() can wait. 1425 */ 1426 tq = tp->t_rawq; 1427 bzero(&tp->t_rawq, sizeof tp->t_rawq); 1428 tp->t_rawq.c_cbmax = tq.c_cbmax; 1429 tp->t_rawq.c_cbreserved = tq.c_cbreserved; 1430 while ((c = getc(&tq)) >= 0) 1431 ttyinput(c, tp); 1432 CLR(tp->t_state, TS_TYPEN); 1433 } 1434 1435 /* 1436 * Process a read call on a tty device. 1437 */ 1438 int 1439 ttread(tp, uio, flag) 1440 register struct tty *tp; 1441 struct uio *uio; 1442 int flag; 1443 { 1444 register struct clist *qp; 1445 register int c; 1446 register tcflag_t lflag; 1447 register cc_t *cc = tp->t_cc; 1448 register struct proc *p = curproc; 1449 int s, first, error = 0; 1450 int has_stime = 0, last_cc = 0; 1451 long slp = 0; /* XXX this should be renamed `timo'. */ 1452 struct timeval stime; 1453 1454 loop: 1455 s = spltty(); 1456 lflag = tp->t_lflag; 1457 /* 1458 * take pending input first 1459 */ 1460 if (ISSET(lflag, PENDIN)) { 1461 ttypend(tp); 1462 splx(s); /* reduce latency */ 1463 s = spltty(); 1464 lflag = tp->t_lflag; /* XXX ttypend() clobbers it */ 1465 } 1466 1467 /* 1468 * Hang process if it's in the background. 1469 */ 1470 if (isbackground(p, tp)) { 1471 splx(s); 1472 if ((p->p_sigignore & sigmask(SIGTTIN)) || 1473 (p->p_sigmask & sigmask(SIGTTIN)) || 1474 p->p_flag & P_PPWAIT || p->p_pgrp->pg_jobc == 0) 1475 return (EIO); 1476 pgsignal(p->p_pgrp, SIGTTIN, 1); 1477 error = ttysleep(tp, &lbolt, TTIPRI | PCATCH, "ttybg2", 0); 1478 if (error) 1479 return (error); 1480 goto loop; 1481 } 1482 1483 if (ISSET(tp->t_state, TS_ZOMBIE)) { 1484 splx(s); 1485 return (0); /* EOF */ 1486 } 1487 1488 /* 1489 * If canonical, use the canonical queue, 1490 * else use the raw queue. 1491 * 1492 * (should get rid of clists...) 1493 */ 1494 qp = ISSET(lflag, ICANON) ? &tp->t_canq : &tp->t_rawq; 1495 1496 if (flag & IO_NDELAY) { 1497 if (qp->c_cc > 0) 1498 goto read; 1499 if (!ISSET(lflag, ICANON) && cc[VMIN] == 0) { 1500 splx(s); 1501 return (0); 1502 } 1503 splx(s); 1504 return (EWOULDBLOCK); 1505 } 1506 if (!ISSET(lflag, ICANON)) { 1507 int m = cc[VMIN]; 1508 long t = cc[VTIME]; 1509 struct timeval timecopy; 1510 1511 /* 1512 * Check each of the four combinations. 1513 * (m > 0 && t == 0) is the normal read case. 1514 * It should be fairly efficient, so we check that and its 1515 * companion case (m == 0 && t == 0) first. 1516 * For the other two cases, we compute the target sleep time 1517 * into slp. 1518 */ 1519 if (t == 0) { 1520 if (qp->c_cc < m) 1521 goto sleep; 1522 if (qp->c_cc > 0) 1523 goto read; 1524 1525 /* m, t and qp->c_cc are all 0. 0 is enough input. */ 1526 splx(s); 1527 return (0); 1528 } 1529 t *= 100000; /* time in us */ 1530 #define diff(t1, t2) (((t1).tv_sec - (t2).tv_sec) * 1000000 + \ 1531 ((t1).tv_usec - (t2).tv_usec)) 1532 if (m > 0) { 1533 if (qp->c_cc <= 0) 1534 goto sleep; 1535 if (qp->c_cc >= m) 1536 goto read; 1537 getmicrotime(&timecopy); 1538 if (!has_stime) { 1539 /* first character, start timer */ 1540 has_stime = 1; 1541 stime = timecopy; 1542 slp = t; 1543 } else if (qp->c_cc > last_cc) { 1544 /* got a character, restart timer */ 1545 stime = timecopy; 1546 slp = t; 1547 } else { 1548 /* nothing, check expiration */ 1549 slp = t - diff(timecopy, stime); 1550 if (slp <= 0) 1551 goto read; 1552 } 1553 last_cc = qp->c_cc; 1554 } else { /* m == 0 */ 1555 if (qp->c_cc > 0) 1556 goto read; 1557 getmicrotime(&timecopy); 1558 if (!has_stime) { 1559 has_stime = 1; 1560 stime = timecopy; 1561 slp = t; 1562 } else { 1563 slp = t - diff(timecopy, stime); 1564 if (slp <= 0) { 1565 /* Timed out, but 0 is enough input. */ 1566 splx(s); 1567 return (0); 1568 } 1569 } 1570 } 1571 #undef diff 1572 /* 1573 * Rounding down may make us wake up just short 1574 * of the target, so we round up. 1575 * The formula is ceiling(slp * hz/1000000). 1576 * 32-bit arithmetic is enough for hz < 169. 1577 * XXX see tvtohz() for how to avoid overflow if hz 1578 * is large (divide by `tick' and/or arrange to 1579 * use tvtohz() if hz is large). 1580 */ 1581 slp = (long) (((u_long)slp * hz) + 999999) / 1000000; 1582 goto sleep; 1583 } 1584 if (qp->c_cc <= 0) { 1585 sleep: 1586 /* 1587 * There is no input, or not enough input and we can block. 1588 */ 1589 error = ttysleep(tp, TSA_HUP_OR_INPUT(tp), TTIPRI | PCATCH, 1590 ISSET(tp->t_state, TS_CONNECTED) ? 1591 "ttyin" : "ttyhup", (int)slp); 1592 splx(s); 1593 if (error == EWOULDBLOCK) 1594 error = 0; 1595 else if (error) 1596 return (error); 1597 /* 1598 * XXX what happens if another process eats some input 1599 * while we are asleep (not just here)? It would be 1600 * safest to detect changes and reset our state variables 1601 * (has_stime and last_cc). 1602 */ 1603 slp = 0; 1604 goto loop; 1605 } 1606 read: 1607 splx(s); 1608 /* 1609 * Input present, check for input mapping and processing. 1610 */ 1611 first = 1; 1612 if (ISSET(lflag, ICANON | ISIG)) 1613 goto slowcase; 1614 for (;;) { 1615 char ibuf[IBUFSIZ]; 1616 int icc; 1617 1618 icc = imin(uio->uio_resid, IBUFSIZ); 1619 icc = q_to_b(qp, ibuf, icc); 1620 if (icc <= 0) { 1621 if (first) 1622 goto loop; 1623 break; 1624 } 1625 error = uiomove(ibuf, icc, uio); 1626 /* 1627 * XXX if there was an error then we should ungetc() the 1628 * unmoved chars and reduce icc here. 1629 */ 1630 #if NSNP > 0 1631 if (ISSET(tp->t_lflag, ECHO) && 1632 ISSET(tp->t_state, TS_SNOOP) && tp->t_sc != NULL) 1633 snpin((struct snoop *)tp->t_sc, ibuf, icc); 1634 #endif 1635 if (error) 1636 break; 1637 if (uio->uio_resid == 0) 1638 break; 1639 first = 0; 1640 } 1641 goto out; 1642 slowcase: 1643 for (;;) { 1644 c = getc(qp); 1645 if (c < 0) { 1646 if (first) 1647 goto loop; 1648 break; 1649 } 1650 /* 1651 * delayed suspend (^Y) 1652 */ 1653 if (CCEQ(cc[VDSUSP], c) && 1654 ISSET(lflag, IEXTEN | ISIG) == (IEXTEN | ISIG)) { 1655 pgsignal(tp->t_pgrp, SIGTSTP, 1); 1656 if (first) { 1657 error = ttysleep(tp, &lbolt, TTIPRI | PCATCH, 1658 "ttybg3", 0); 1659 if (error) 1660 break; 1661 goto loop; 1662 } 1663 break; 1664 } 1665 /* 1666 * Interpret EOF only in canonical mode. 1667 */ 1668 if (CCEQ(cc[VEOF], c) && ISSET(lflag, ICANON)) 1669 break; 1670 /* 1671 * Give user character. 1672 */ 1673 error = ureadc(c, uio); 1674 if (error) 1675 /* XXX should ungetc(c, qp). */ 1676 break; 1677 #if NSNP > 0 1678 /* 1679 * Only snoop directly on input in echo mode. Non-echoed 1680 * input will be snooped later iff the application echoes it. 1681 */ 1682 if (ISSET(tp->t_lflag, ECHO) && 1683 ISSET(tp->t_state, TS_SNOOP) && tp->t_sc != NULL) 1684 snpinc((struct snoop *)tp->t_sc, (char)c); 1685 #endif 1686 if (uio->uio_resid == 0) 1687 break; 1688 /* 1689 * In canonical mode check for a "break character" 1690 * marking the end of a "line of input". 1691 */ 1692 if (ISSET(lflag, ICANON) && TTBREAKC(c, lflag)) 1693 break; 1694 first = 0; 1695 } 1696 1697 out: 1698 /* 1699 * Look to unblock input now that (presumably) 1700 * the input queue has gone down. 1701 */ 1702 s = spltty(); 1703 if (ISSET(tp->t_state, TS_TBLOCK) && 1704 tp->t_rawq.c_cc + tp->t_canq.c_cc <= tp->t_ilowat) 1705 ttyunblock(tp); 1706 splx(s); 1707 1708 return (error); 1709 } 1710 1711 /* 1712 * Check the output queue on tp for space for a kernel message (from uprintf 1713 * or tprintf). Allow some space over the normal hiwater mark so we don't 1714 * lose messages due to normal flow control, but don't let the tty run amok. 1715 * Sleeps here are not interruptible, but we return prematurely if new signals 1716 * arrive. 1717 */ 1718 int 1719 ttycheckoutq(tp, wait) 1720 register struct tty *tp; 1721 int wait; 1722 { 1723 int hiwat, s, oldsig; 1724 1725 hiwat = tp->t_ohiwat; 1726 s = spltty(); 1727 oldsig = wait ? curproc->p_siglist : 0; 1728 if (tp->t_outq.c_cc > hiwat + OBUFSIZ + 100) 1729 while (tp->t_outq.c_cc > hiwat) { 1730 ttstart(tp); 1731 if (tp->t_outq.c_cc <= hiwat) 1732 break; 1733 if (wait == 0 || curproc->p_siglist != oldsig) { 1734 splx(s); 1735 return (0); 1736 } 1737 SET(tp->t_state, TS_SO_OLOWAT); 1738 tsleep(TSA_OLOWAT(tp), PZERO - 1, "ttoutq", hz); 1739 } 1740 splx(s); 1741 return (1); 1742 } 1743 1744 /* 1745 * Process a write call on a tty device. 1746 */ 1747 int 1748 ttwrite(tp, uio, flag) 1749 register struct tty *tp; 1750 register struct uio *uio; 1751 int flag; 1752 { 1753 register char *cp = NULL; 1754 register int cc, ce; 1755 register struct proc *p; 1756 int i, hiwat, cnt, error, s; 1757 char obuf[OBUFSIZ]; 1758 1759 hiwat = tp->t_ohiwat; 1760 cnt = uio->uio_resid; 1761 error = 0; 1762 cc = 0; 1763 loop: 1764 s = spltty(); 1765 if (ISSET(tp->t_state, TS_ZOMBIE)) { 1766 splx(s); 1767 if (uio->uio_resid == cnt) 1768 error = EIO; 1769 goto out; 1770 } 1771 if (!ISSET(tp->t_state, TS_CONNECTED)) { 1772 if (flag & IO_NDELAY) { 1773 splx(s); 1774 error = EWOULDBLOCK; 1775 goto out; 1776 } 1777 error = ttysleep(tp, TSA_CARR_ON(tp), TTIPRI | PCATCH, 1778 "ttydcd", 0); 1779 splx(s); 1780 if (error) 1781 goto out; 1782 goto loop; 1783 } 1784 splx(s); 1785 /* 1786 * Hang the process if it's in the background. 1787 */ 1788 p = curproc; 1789 if (isbackground(p, tp) && 1790 ISSET(tp->t_lflag, TOSTOP) && (p->p_flag & P_PPWAIT) == 0 && 1791 (p->p_sigignore & sigmask(SIGTTOU)) == 0 && 1792 (p->p_sigmask & sigmask(SIGTTOU)) == 0) { 1793 if (p->p_pgrp->pg_jobc == 0) { 1794 error = EIO; 1795 goto out; 1796 } 1797 pgsignal(p->p_pgrp, SIGTTOU, 1); 1798 error = ttysleep(tp, &lbolt, TTIPRI | PCATCH, "ttybg4", 0); 1799 if (error) 1800 goto out; 1801 goto loop; 1802 } 1803 /* 1804 * Process the user's data in at most OBUFSIZ chunks. Perform any 1805 * output translation. Keep track of high water mark, sleep on 1806 * overflow awaiting device aid in acquiring new space. 1807 */ 1808 while (uio->uio_resid > 0 || cc > 0) { 1809 if (ISSET(tp->t_lflag, FLUSHO)) { 1810 uio->uio_resid = 0; 1811 return (0); 1812 } 1813 if (tp->t_outq.c_cc > hiwat) 1814 goto ovhiwat; 1815 /* 1816 * Grab a hunk of data from the user, unless we have some 1817 * leftover from last time. 1818 */ 1819 if (cc == 0) { 1820 cc = imin(uio->uio_resid, OBUFSIZ); 1821 cp = obuf; 1822 error = uiomove(cp, cc, uio); 1823 if (error) { 1824 cc = 0; 1825 break; 1826 } 1827 #if NSNP > 0 1828 if (ISSET(tp->t_state, TS_SNOOP) && tp->t_sc != NULL) 1829 snpin((struct snoop *)tp->t_sc, cp, cc); 1830 #endif 1831 } 1832 /* 1833 * If nothing fancy need be done, grab those characters we 1834 * can handle without any of ttyoutput's processing and 1835 * just transfer them to the output q. For those chars 1836 * which require special processing (as indicated by the 1837 * bits in char_type), call ttyoutput. After processing 1838 * a hunk of data, look for FLUSHO so ^O's will take effect 1839 * immediately. 1840 */ 1841 while (cc > 0) { 1842 if (!ISSET(tp->t_oflag, OPOST)) 1843 ce = cc; 1844 else { 1845 ce = cc - scanc((u_int)cc, (u_char *)cp, 1846 char_type, CCLASSMASK); 1847 /* 1848 * If ce is zero, then we're processing 1849 * a special character through ttyoutput. 1850 */ 1851 if (ce == 0) { 1852 tp->t_rocount = 0; 1853 if (ttyoutput(*cp, tp) >= 0) { 1854 /* No Clists, wait a bit. */ 1855 ttstart(tp); 1856 if (flag & IO_NDELAY) { 1857 error = EWOULDBLOCK; 1858 goto out; 1859 } 1860 error = ttysleep(tp, &lbolt, 1861 TTOPRI|PCATCH, 1862 "ttybf1", 0); 1863 if (error) 1864 goto out; 1865 goto loop; 1866 } 1867 cp++; 1868 cc--; 1869 if (ISSET(tp->t_lflag, FLUSHO) || 1870 tp->t_outq.c_cc > hiwat) 1871 goto ovhiwat; 1872 continue; 1873 } 1874 } 1875 /* 1876 * A bunch of normal characters have been found. 1877 * Transfer them en masse to the output queue and 1878 * continue processing at the top of the loop. 1879 * If there are any further characters in this 1880 * <= OBUFSIZ chunk, the first should be a character 1881 * requiring special handling by ttyoutput. 1882 */ 1883 tp->t_rocount = 0; 1884 i = b_to_q(cp, ce, &tp->t_outq); 1885 ce -= i; 1886 tp->t_column += ce; 1887 cp += ce, cc -= ce, tk_nout += ce; 1888 tp->t_outcc += ce; 1889 if (i > 0) { 1890 /* No Clists, wait a bit. */ 1891 ttstart(tp); 1892 if (flag & IO_NDELAY) { 1893 error = EWOULDBLOCK; 1894 goto out; 1895 } 1896 error = ttysleep(tp, &lbolt, TTOPRI | PCATCH, 1897 "ttybf2", 0); 1898 if (error) 1899 goto out; 1900 goto loop; 1901 } 1902 if (ISSET(tp->t_lflag, FLUSHO) || 1903 tp->t_outq.c_cc > hiwat) 1904 break; 1905 } 1906 ttstart(tp); 1907 } 1908 out: 1909 /* 1910 * If cc is nonzero, we leave the uio structure inconsistent, as the 1911 * offset and iov pointers have moved forward, but it doesn't matter 1912 * (the call will either return short or restart with a new uio). 1913 */ 1914 uio->uio_resid += cc; 1915 return (error); 1916 1917 ovhiwat: 1918 ttstart(tp); 1919 s = spltty(); 1920 /* 1921 * This can only occur if FLUSHO is set in t_lflag, 1922 * or if ttstart/oproc is synchronous (or very fast). 1923 */ 1924 if (tp->t_outq.c_cc <= hiwat) { 1925 splx(s); 1926 goto loop; 1927 } 1928 if (flag & IO_NDELAY) { 1929 splx(s); 1930 uio->uio_resid += cc; 1931 return (uio->uio_resid == cnt ? EWOULDBLOCK : 0); 1932 } 1933 SET(tp->t_state, TS_SO_OLOWAT); 1934 error = ttysleep(tp, TSA_OLOWAT(tp), TTOPRI | PCATCH, "ttywri", 1935 tp->t_timeout); 1936 splx(s); 1937 if (error == EWOULDBLOCK) 1938 error = EIO; 1939 if (error) 1940 goto out; 1941 goto loop; 1942 } 1943 1944 /* 1945 * Rubout one character from the rawq of tp 1946 * as cleanly as possible. 1947 */ 1948 static void 1949 ttyrub(c, tp) 1950 register int c; 1951 register struct tty *tp; 1952 { 1953 register char *cp; 1954 register int savecol; 1955 int tabc, s; 1956 1957 if (!ISSET(tp->t_lflag, ECHO) || ISSET(tp->t_lflag, EXTPROC)) 1958 return; 1959 CLR(tp->t_lflag, FLUSHO); 1960 if (ISSET(tp->t_lflag, ECHOE)) { 1961 if (tp->t_rocount == 0) { 1962 /* 1963 * Screwed by ttwrite; retype 1964 */ 1965 ttyretype(tp); 1966 return; 1967 } 1968 if (c == ('\t' | TTY_QUOTE) || c == ('\n' | TTY_QUOTE)) 1969 ttyrubo(tp, 2); 1970 else { 1971 CLR(c, ~TTY_CHARMASK); 1972 switch (CCLASS(c)) { 1973 case ORDINARY: 1974 ttyrubo(tp, 1); 1975 break; 1976 case BACKSPACE: 1977 case CONTROL: 1978 case NEWLINE: 1979 case RETURN: 1980 case VTAB: 1981 if (ISSET(tp->t_lflag, ECHOCTL)) 1982 ttyrubo(tp, 2); 1983 break; 1984 case TAB: 1985 if (tp->t_rocount < tp->t_rawq.c_cc) { 1986 ttyretype(tp); 1987 return; 1988 } 1989 s = spltty(); 1990 savecol = tp->t_column; 1991 SET(tp->t_state, TS_CNTTB); 1992 SET(tp->t_lflag, FLUSHO); 1993 tp->t_column = tp->t_rocol; 1994 cp = tp->t_rawq.c_cf; 1995 if (cp) 1996 tabc = *cp; /* XXX FIX NEXTC */ 1997 for (; cp; cp = nextc(&tp->t_rawq, cp, &tabc)) 1998 ttyecho(tabc, tp); 1999 CLR(tp->t_lflag, FLUSHO); 2000 CLR(tp->t_state, TS_CNTTB); 2001 splx(s); 2002 2003 /* savecol will now be length of the tab. */ 2004 savecol -= tp->t_column; 2005 tp->t_column += savecol; 2006 if (savecol > 8) 2007 savecol = 8; /* overflow screw */ 2008 while (--savecol >= 0) 2009 (void)ttyoutput('\b', tp); 2010 break; 2011 default: /* XXX */ 2012 #define PANICSTR "ttyrub: would panic c = %d, val = %d\n" 2013 (void)printf(PANICSTR, c, CCLASS(c)); 2014 #ifdef notdef 2015 panic(PANICSTR, c, CCLASS(c)); 2016 #endif 2017 } 2018 } 2019 } else if (ISSET(tp->t_lflag, ECHOPRT)) { 2020 if (!ISSET(tp->t_state, TS_ERASE)) { 2021 SET(tp->t_state, TS_ERASE); 2022 (void)ttyoutput('\\', tp); 2023 } 2024 ttyecho(c, tp); 2025 } else 2026 ttyecho(tp->t_cc[VERASE], tp); 2027 --tp->t_rocount; 2028 } 2029 2030 /* 2031 * Back over cnt characters, erasing them. 2032 */ 2033 static void 2034 ttyrubo(tp, cnt) 2035 register struct tty *tp; 2036 int cnt; 2037 { 2038 2039 while (cnt-- > 0) { 2040 (void)ttyoutput('\b', tp); 2041 (void)ttyoutput(' ', tp); 2042 (void)ttyoutput('\b', tp); 2043 } 2044 } 2045 2046 /* 2047 * ttyretype -- 2048 * Reprint the rawq line. Note, it is assumed that c_cc has already 2049 * been checked. 2050 */ 2051 static void 2052 ttyretype(tp) 2053 register struct tty *tp; 2054 { 2055 register char *cp; 2056 int s, c; 2057 2058 /* Echo the reprint character. */ 2059 if (tp->t_cc[VREPRINT] != _POSIX_VDISABLE) 2060 ttyecho(tp->t_cc[VREPRINT], tp); 2061 2062 (void)ttyoutput('\n', tp); 2063 2064 /* 2065 * XXX 2066 * FIX: NEXTC IS BROKEN - DOESN'T CHECK QUOTE 2067 * BIT OF FIRST CHAR. 2068 */ 2069 s = spltty(); 2070 for (cp = tp->t_canq.c_cf, c = (cp != NULL ? *cp : 0); 2071 cp != NULL; cp = nextc(&tp->t_canq, cp, &c)) 2072 ttyecho(c, tp); 2073 for (cp = tp->t_rawq.c_cf, c = (cp != NULL ? *cp : 0); 2074 cp != NULL; cp = nextc(&tp->t_rawq, cp, &c)) 2075 ttyecho(c, tp); 2076 CLR(tp->t_state, TS_ERASE); 2077 splx(s); 2078 2079 tp->t_rocount = tp->t_rawq.c_cc; 2080 tp->t_rocol = 0; 2081 } 2082 2083 /* 2084 * Echo a typed character to the terminal. 2085 */ 2086 static void 2087 ttyecho(c, tp) 2088 register int c; 2089 register struct tty *tp; 2090 { 2091 2092 if (!ISSET(tp->t_state, TS_CNTTB)) 2093 CLR(tp->t_lflag, FLUSHO); 2094 if ((!ISSET(tp->t_lflag, ECHO) && 2095 (c != '\n' || !ISSET(tp->t_lflag, ECHONL))) || 2096 ISSET(tp->t_lflag, EXTPROC)) 2097 return; 2098 if (ISSET(tp->t_lflag, ECHOCTL) && 2099 ((ISSET(c, TTY_CHARMASK) <= 037 && c != '\t' && c != '\n') || 2100 ISSET(c, TTY_CHARMASK) == 0177)) { 2101 (void)ttyoutput('^', tp); 2102 CLR(c, ~TTY_CHARMASK); 2103 if (c == 0177) 2104 c = '?'; 2105 else 2106 c += 'A' - 1; 2107 } 2108 (void)ttyoutput(c, tp); 2109 } 2110 2111 /* 2112 * Wake up any readers on a tty. 2113 */ 2114 void 2115 ttwakeup(tp) 2116 register struct tty *tp; 2117 { 2118 2119 if (tp->t_rsel.si_pid != 0) 2120 selwakeup(&tp->t_rsel); 2121 if (ISSET(tp->t_state, TS_ASYNC) && tp->t_sigio != NULL) 2122 pgsigio(tp->t_sigio, SIGIO, (tp->t_session != NULL)); 2123 wakeup(TSA_HUP_OR_INPUT(tp)); 2124 } 2125 2126 /* 2127 * Wake up any writers on a tty. 2128 */ 2129 void 2130 ttwwakeup(tp) 2131 register struct tty *tp; 2132 { 2133 2134 if (tp->t_wsel.si_pid != 0 && tp->t_outq.c_cc <= tp->t_olowat) 2135 selwakeup(&tp->t_wsel); 2136 if (ISSET(tp->t_state, TS_ASYNC) && tp->t_sigio != NULL) 2137 pgsigio(tp->t_sigio, SIGIO, (tp->t_session != NULL)); 2138 if (ISSET(tp->t_state, TS_BUSY | TS_SO_OCOMPLETE) == 2139 TS_SO_OCOMPLETE && tp->t_outq.c_cc == 0) { 2140 CLR(tp->t_state, TS_SO_OCOMPLETE); 2141 wakeup(TSA_OCOMPLETE(tp)); 2142 } 2143 if (ISSET(tp->t_state, TS_SO_OLOWAT) && 2144 tp->t_outq.c_cc <= tp->t_olowat) { 2145 CLR(tp->t_state, TS_SO_OLOWAT); 2146 wakeup(TSA_OLOWAT(tp)); 2147 } 2148 } 2149 2150 /* 2151 * Look up a code for a specified speed in a conversion table; 2152 * used by drivers to map software speed values to hardware parameters. 2153 */ 2154 int 2155 ttspeedtab(speed, table) 2156 int speed; 2157 register struct speedtab *table; 2158 { 2159 2160 for ( ; table->sp_speed != -1; table++) 2161 if (table->sp_speed == speed) 2162 return (table->sp_code); 2163 return (-1); 2164 } 2165 2166 /* 2167 * Set input and output watermarks and buffer sizes. For input, the 2168 * high watermark is about one second's worth of input above empty, the 2169 * low watermark is slightly below high water, and the buffer size is a 2170 * driver-dependent amount above high water. For output, the watermarks 2171 * are near the ends of the buffer, with about 1 second's worth of input 2172 * between them. All this only applies to the standard line discipline. 2173 */ 2174 void 2175 ttsetwater(tp) 2176 struct tty *tp; 2177 { 2178 register int cps, ttmaxhiwat, x; 2179 2180 /* Input. */ 2181 clist_alloc_cblocks(&tp->t_canq, TTYHOG, 512); 2182 switch (tp->t_ispeedwat) { 2183 case (speed_t)-1: 2184 cps = tp->t_ispeed / 10; 2185 break; 2186 case 0: 2187 /* 2188 * This case is for old drivers that don't know about 2189 * t_ispeedwat. Arrange for them to get the old buffer 2190 * sizes and watermarks. 2191 */ 2192 cps = TTYHOG - 2 * 256; 2193 tp->t_ififosize = 2 * 256; 2194 break; 2195 default: 2196 cps = tp->t_ispeedwat / 10; 2197 break; 2198 } 2199 tp->t_ihiwat = cps; 2200 tp->t_ilowat = 7 * cps / 8; 2201 x = cps + tp->t_ififosize; 2202 clist_alloc_cblocks(&tp->t_rawq, x, x); 2203 2204 /* Output. */ 2205 switch (tp->t_ospeedwat) { 2206 case (speed_t)-1: 2207 cps = tp->t_ospeed / 10; 2208 ttmaxhiwat = 2 * TTMAXHIWAT; 2209 break; 2210 case 0: 2211 cps = tp->t_ospeed / 10; 2212 ttmaxhiwat = TTMAXHIWAT; 2213 break; 2214 default: 2215 cps = tp->t_ospeedwat / 10; 2216 ttmaxhiwat = 8 * TTMAXHIWAT; 2217 break; 2218 } 2219 #define CLAMP(x, h, l) ((x) > h ? h : ((x) < l) ? l : (x)) 2220 tp->t_olowat = x = CLAMP(cps / 2, TTMAXLOWAT, TTMINLOWAT); 2221 x += cps; 2222 x = CLAMP(x, ttmaxhiwat, TTMINHIWAT); /* XXX clamps are too magic */ 2223 tp->t_ohiwat = roundup(x, CBSIZE); /* XXX for compat */ 2224 x = imax(tp->t_ohiwat, TTMAXHIWAT); /* XXX for compat/safety */ 2225 x += OBUFSIZ + 100; 2226 clist_alloc_cblocks(&tp->t_outq, x, x); 2227 #undef CLAMP 2228 } 2229 2230 /* 2231 * Report on state of foreground process group. 2232 */ 2233 void 2234 ttyinfo(tp) 2235 register struct tty *tp; 2236 { 2237 register struct proc *p, *pick; 2238 struct timeval utime, stime; 2239 int tmp; 2240 2241 if (ttycheckoutq(tp,0) == 0) 2242 return; 2243 2244 /* Print load average. */ 2245 tmp = (averunnable.ldavg[0] * 100 + FSCALE / 2) >> FSHIFT; 2246 ttyprintf(tp, "load: %d.%02d ", tmp / 100, tmp % 100); 2247 2248 if (tp->t_session == NULL) 2249 ttyprintf(tp, "not a controlling terminal\n"); 2250 else if (tp->t_pgrp == NULL) 2251 ttyprintf(tp, "no foreground process group\n"); 2252 else if ((p = tp->t_pgrp->pg_members.lh_first) == 0) 2253 ttyprintf(tp, "empty foreground process group\n"); 2254 else { 2255 /* Pick interesting process. */ 2256 for (pick = NULL; p != 0; p = p->p_pglist.le_next) 2257 if (proc_compare(pick, p)) 2258 pick = p; 2259 2260 ttyprintf(tp, " cmd: %s %d [%s] ", pick->p_comm, pick->p_pid, 2261 pick->p_stat == SRUN ? "running" : 2262 pick->p_wmesg ? pick->p_wmesg : "iowait"); 2263 2264 calcru(pick, &utime, &stime, NULL); 2265 2266 /* Print user time. */ 2267 ttyprintf(tp, "%ld.%02ldu ", 2268 utime.tv_sec, utime.tv_usec / 10000); 2269 2270 /* Print system time. */ 2271 ttyprintf(tp, "%ld.%02lds ", 2272 stime.tv_sec, stime.tv_usec / 10000); 2273 2274 #define pgtok(a) (((a) * PAGE_SIZE) / 1024) 2275 /* Print percentage cpu, resident set size. */ 2276 tmp = (pick->p_pctcpu * 10000 + FSCALE / 2) >> FSHIFT; 2277 ttyprintf(tp, "%d%% %ldk\n", 2278 tmp / 100, 2279 pick->p_stat == SIDL || pick->p_stat == SZOMB ? 0 : 2280 #ifdef pmap_resident_count 2281 (long)pgtok(pmap_resident_count(&pick->p_vmspace->vm_pmap)) 2282 #else 2283 (long)pgtok(pick->p_vmspace->vm_rssize) 2284 #endif 2285 ); 2286 } 2287 tp->t_rocount = 0; /* so pending input will be retyped if BS */ 2288 } 2289 2290 /* 2291 * Returns 1 if p2 is "better" than p1 2292 * 2293 * The algorithm for picking the "interesting" process is thus: 2294 * 2295 * 1) Only foreground processes are eligible - implied. 2296 * 2) Runnable processes are favored over anything else. The runner 2297 * with the highest cpu utilization is picked (p_estcpu). Ties are 2298 * broken by picking the highest pid. 2299 * 3) The sleeper with the shortest sleep time is next. With ties, 2300 * we pick out just "short-term" sleepers (P_SINTR == 0). 2301 * 4) Further ties are broken by picking the highest pid. 2302 */ 2303 #define ISRUN(p) (((p)->p_stat == SRUN) || ((p)->p_stat == SIDL)) 2304 #define TESTAB(a, b) ((a)<<1 | (b)) 2305 #define ONLYA 2 2306 #define ONLYB 1 2307 #define BOTH 3 2308 2309 static int 2310 proc_compare(p1, p2) 2311 register struct proc *p1, *p2; 2312 { 2313 2314 if (p1 == NULL) 2315 return (1); 2316 /* 2317 * see if at least one of them is runnable 2318 */ 2319 switch (TESTAB(ISRUN(p1), ISRUN(p2))) { 2320 case ONLYA: 2321 return (0); 2322 case ONLYB: 2323 return (1); 2324 case BOTH: 2325 /* 2326 * tie - favor one with highest recent cpu utilization 2327 */ 2328 if (p2->p_estcpu > p1->p_estcpu) 2329 return (1); 2330 if (p1->p_estcpu > p2->p_estcpu) 2331 return (0); 2332 return (p2->p_pid > p1->p_pid); /* tie - return highest pid */ 2333 } 2334 /* 2335 * weed out zombies 2336 */ 2337 switch (TESTAB(p1->p_stat == SZOMB, p2->p_stat == SZOMB)) { 2338 case ONLYA: 2339 return (1); 2340 case ONLYB: 2341 return (0); 2342 case BOTH: 2343 return (p2->p_pid > p1->p_pid); /* tie - return highest pid */ 2344 } 2345 /* 2346 * pick the one with the smallest sleep time 2347 */ 2348 if (p2->p_slptime > p1->p_slptime) 2349 return (0); 2350 if (p1->p_slptime > p2->p_slptime) 2351 return (1); 2352 /* 2353 * favor one sleeping in a non-interruptible sleep 2354 */ 2355 if (p1->p_flag & P_SINTR && (p2->p_flag & P_SINTR) == 0) 2356 return (1); 2357 if (p2->p_flag & P_SINTR && (p1->p_flag & P_SINTR) == 0) 2358 return (0); 2359 return (p2->p_pid > p1->p_pid); /* tie - return highest pid */ 2360 } 2361 2362 /* 2363 * Output char to tty; console putchar style. 2364 */ 2365 int 2366 tputchar(c, tp) 2367 int c; 2368 struct tty *tp; 2369 { 2370 register int s; 2371 2372 s = spltty(); 2373 if (!ISSET(tp->t_state, TS_CONNECTED)) { 2374 splx(s); 2375 return (-1); 2376 } 2377 if (c == '\n') 2378 (void)ttyoutput('\r', tp); 2379 (void)ttyoutput(c, tp); 2380 ttstart(tp); 2381 splx(s); 2382 return (0); 2383 } 2384 2385 /* 2386 * Sleep on chan, returning ERESTART if tty changed while we napped and 2387 * returning any errors (e.g. EINTR/EWOULDBLOCK) reported by tsleep. If 2388 * the tty is revoked, restarting a pending call will redo validation done 2389 * at the start of the call. 2390 */ 2391 int 2392 ttysleep(tp, chan, pri, wmesg, timo) 2393 struct tty *tp; 2394 void *chan; 2395 int pri, timo; 2396 char *wmesg; 2397 { 2398 int error; 2399 int gen; 2400 2401 gen = tp->t_gen; 2402 error = tsleep(chan, pri, wmesg, timo); 2403 if (error) 2404 return (error); 2405 return (tp->t_gen == gen ? 0 : ERESTART); 2406 } 2407 2408 #ifdef notyet 2409 /* 2410 * XXX this is usable not useful or used. Most tty drivers have 2411 * ifdefs for using ttymalloc() but assume a different interface. 2412 */ 2413 /* 2414 * Allocate a tty struct. Clists in the struct will be allocated by 2415 * ttyopen(). 2416 */ 2417 struct tty * 2418 ttymalloc() 2419 { 2420 struct tty *tp; 2421 2422 tp = malloc(sizeof *tp, M_TTYS, M_WAITOK); 2423 bzero(tp, sizeof *tp); 2424 return (tp); 2425 } 2426 #endif 2427 2428 #if 0 /* XXX not yet usable: session leader holds a ref (see kern_exit.c). */ 2429 /* 2430 * Free a tty struct. Clists in the struct should have been freed by 2431 * ttyclose(). 2432 */ 2433 void 2434 ttyfree(tp) 2435 struct tty *tp; 2436 { 2437 free(tp, M_TTYS); 2438 } 2439 #endif /* 0 */
Cache object: 74bf7868704bcfb706b9a0f3b421af60
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