tty.c revision 24101
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 * $Id: tty.c,v 1.91 1997/02/22 09:39:23 peter Exp $ 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 Handle c_ispeed = 0 to c_ispeed = c_ospeed conversion here instead 62 * of in drivers and fix drivers that write to tp->t_termios. 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_uconsole.h" 72 73#include <sys/param.h> 74#include <sys/systm.h> 75#include <sys/ioctl.h> 76#include <sys/proc.h> 77#define TTYDEFCHARS 78#include <sys/tty.h> 79#undef TTYDEFCHARS 80#include <sys/file.h> 81#include <sys/conf.h> 82#include <sys/dkstat.h> 83#include <sys/uio.h> 84#include <sys/kernel.h> 85#include <sys/vnode.h> 86#include <sys/syslog.h> 87#include <sys/signalvar.h> 88#include <sys/resourcevar.h> 89#include <sys/malloc.h> 90#if NSNP > 0 91#include <sys/snoop.h> 92#endif 93 94#include <vm/vm.h> 95#include <vm/vm_param.h> 96#include <vm/vm_prot.h> 97#include <sys/lock.h> 98#include <vm/pmap.h> 99#include <vm/vm_map.h> 100 101static int proc_compare __P((struct proc *p1, struct proc *p2)); 102static int ttnread __P((struct tty *tp)); 103static void ttyecho __P((int c, struct tty *tp)); 104static int ttyoutput __P((int c, register struct tty *tp)); 105static void ttypend __P((struct tty *tp)); 106static void ttyretype __P((struct tty *tp)); 107static void ttyrub __P((int c, struct tty *tp)); 108static void ttyrubo __P((struct tty *tp, int cnt)); 109static void ttyunblock __P((struct tty *tp)); 110static int ttywflush __P((struct tty *tp)); 111 112/* 113 * Table with character classes and parity. The 8th bit indicates parity, 114 * the 7th bit indicates the character is an alphameric or underscore (for 115 * ALTWERASE), and the low 6 bits indicate delay type. If the low 6 bits 116 * are 0 then the character needs no special processing on output; classes 117 * other than 0 might be translated or (not currently) require delays. 118 */ 119#define E 0x00 /* Even parity. */ 120#define O 0x80 /* Odd parity. */ 121#define PARITY(c) (char_type[c] & O) 122 123#define ALPHA 0x40 /* Alpha or underscore. */ 124#define ISALPHA(c) (char_type[(c) & TTY_CHARMASK] & ALPHA) 125 126#define CCLASSMASK 0x3f 127#define CCLASS(c) (char_type[c] & CCLASSMASK) 128 129#define BS BACKSPACE 130#define CC CONTROL 131#define CR RETURN 132#define NA ORDINARY | ALPHA 133#define NL NEWLINE 134#define NO ORDINARY 135#define TB TAB 136#define VT VTAB 137 138static u_char const char_type[] = { 139 E|CC, O|CC, O|CC, E|CC, O|CC, E|CC, E|CC, O|CC, /* nul - bel */ 140 O|BS, E|TB, E|NL, O|CC, E|VT, O|CR, O|CC, E|CC, /* bs - si */ 141 O|CC, E|CC, E|CC, O|CC, E|CC, O|CC, O|CC, E|CC, /* dle - etb */ 142 E|CC, O|CC, O|CC, E|CC, O|CC, E|CC, E|CC, O|CC, /* can - us */ 143 O|NO, E|NO, E|NO, O|NO, E|NO, O|NO, O|NO, E|NO, /* sp - ' */ 144 E|NO, O|NO, O|NO, E|NO, O|NO, E|NO, E|NO, O|NO, /* ( - / */ 145 E|NA, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* 0 - 7 */ 146 O|NA, E|NA, E|NO, O|NO, E|NO, O|NO, O|NO, E|NO, /* 8 - ? */ 147 O|NO, E|NA, E|NA, O|NA, E|NA, O|NA, O|NA, E|NA, /* @ - G */ 148 E|NA, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* H - O */ 149 E|NA, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* P - W */ 150 O|NA, E|NA, E|NA, O|NO, E|NO, O|NO, O|NO, O|NA, /* X - _ */ 151 E|NO, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* ` - g */ 152 O|NA, E|NA, E|NA, O|NA, E|NA, O|NA, O|NA, E|NA, /* h - o */ 153 O|NA, E|NA, E|NA, O|NA, E|NA, O|NA, O|NA, E|NA, /* p - w */ 154 E|NA, O|NA, O|NA, E|NO, O|NO, E|NO, E|NO, O|CC, /* x - del */ 155 /* 156 * Meta chars; should be settable per character set; 157 * for now, treat them all as normal characters. 158 */ 159 NA, NA, NA, NA, NA, NA, NA, NA, 160 NA, NA, NA, NA, NA, NA, NA, NA, 161 NA, NA, NA, NA, NA, NA, NA, NA, 162 NA, NA, NA, NA, NA, NA, NA, NA, 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}; 176#undef BS 177#undef CC 178#undef CR 179#undef NA 180#undef NL 181#undef NO 182#undef TB 183#undef VT 184 185/* Macros to clear/set/test flags. */ 186#define SET(t, f) (t) |= (f) 187#define CLR(t, f) (t) &= ~(f) 188#define ISSET(t, f) ((t) & (f)) 189 190/* 191 * Input control starts when we would not be able to fit the maximum 192 * contents of the ping-pong buffers and finishes when we would be able 193 * to fit that much plus 1/8 more. 194 */ 195#define I_HIGH_WATER (TTYHOG - 2 * 256) /* XXX */ 196#define I_LOW_WATER ((TTYHOG - 2 * 256) * 7 / 8) /* XXX */ 197 198#undef MAX_INPUT /* XXX wrong in <sys/syslimits.h> */ 199#define MAX_INPUT TTYHOG 200 201/* 202 * Initial open of tty, or (re)entry to standard tty line discipline. 203 */ 204int 205ttyopen(device, tp) 206 dev_t device; 207 register struct tty *tp; 208{ 209 int s; 210 211 s = spltty(); 212 tp->t_dev = device; 213 if (!ISSET(tp->t_state, TS_ISOPEN)) { 214 SET(tp->t_state, TS_ISOPEN); 215 if (ISSET(tp->t_cflag, CLOCAL)) 216 SET(tp->t_state, TS_CONNECTED); 217 bzero(&tp->t_winsize, sizeof(tp->t_winsize)); 218 } 219 220 /* 221 * Initialize or restore a cblock allocation policy suitable for 222 * the standard line discipline. 223 */ 224 clist_alloc_cblocks(&tp->t_canq, TTYHOG, 512); 225 clist_alloc_cblocks(&tp->t_outq, TTMAXHIWAT + OBUFSIZ + 100, 226 TTMAXHIWAT + OBUFSIZ + 100); 227 clist_alloc_cblocks(&tp->t_rawq, TTYHOG, TTYHOG); 228 229 splx(s); 230 return (0); 231} 232 233/* 234 * Handle close() on a tty line: flush and set to initial state, 235 * bumping generation number so that pending read/write calls 236 * can detect recycling of the tty. 237 * XXX our caller should have done `spltty(); l_close(); ttyclose();' 238 * and l_close() should have flushed, but we repeat the spltty() and 239 * the flush in case there are buggy callers. 240 */ 241int 242ttyclose(tp) 243 register struct tty *tp; 244{ 245 int s; 246 247 s = spltty(); 248 if (constty == tp) 249 constty = NULL; 250 251 ttyflush(tp, FREAD | FWRITE); 252 clist_free_cblocks(&tp->t_canq); 253 clist_free_cblocks(&tp->t_outq); 254 clist_free_cblocks(&tp->t_rawq); 255 256#if NSNP > 0 257 if (ISSET(tp->t_state, TS_SNOOP) && tp->t_sc != NULL) 258 snpdown((struct snoop *)tp->t_sc); 259#endif 260 261 tp->t_gen++; 262 tp->t_line = TTYDISC; 263 tp->t_pgrp = NULL; 264 tp->t_session = NULL; 265 tp->t_state = 0; 266 splx(s); 267 return (0); 268} 269 270#define FLUSHQ(q) { \ 271 if ((q)->c_cc) \ 272 ndflush(q, (q)->c_cc); \ 273} 274 275/* Is 'c' a line delimiter ("break" character)? */ 276#define TTBREAKC(c, lflag) \ 277 ((c) == '\n' || (((c) == cc[VEOF] || \ 278 (c) == cc[VEOL] || ((c) == cc[VEOL2] && lflag & IEXTEN)) && \ 279 (c) != _POSIX_VDISABLE)) 280 281/* 282 * Process input of a single character received on a tty. 283 */ 284int 285ttyinput(c, tp) 286 register int c; 287 register struct tty *tp; 288{ 289 register tcflag_t iflag, lflag; 290 register cc_t *cc; 291 int i, err; 292 293 /* 294 * If input is pending take it first. 295 */ 296 lflag = tp->t_lflag; 297 if (ISSET(lflag, PENDIN)) 298 ttypend(tp); 299 /* 300 * Gather stats. 301 */ 302 if (ISSET(lflag, ICANON)) { 303 ++tk_cancc; 304 ++tp->t_cancc; 305 } else { 306 ++tk_rawcc; 307 ++tp->t_rawcc; 308 } 309 ++tk_nin; 310 311 /* 312 * Block further input iff: 313 * current input > threshold AND input is available to user program 314 * AND input flow control is enabled and not yet invoked. 315 * The 3 is slop for PARMRK. 316 */ 317 iflag = tp->t_iflag; 318 if (tp->t_rawq.c_cc + tp->t_canq.c_cc > I_HIGH_WATER - 3 && 319 (!ISSET(lflag, ICANON) || tp->t_canq.c_cc != 0) && 320 (ISSET(tp->t_cflag, CRTS_IFLOW) || ISSET(iflag, IXOFF)) && 321 !ISSET(tp->t_state, TS_TBLOCK)) 322 ttyblock(tp); 323 324 /* Handle exceptional conditions (break, parity, framing). */ 325 cc = tp->t_cc; 326 err = (ISSET(c, TTY_ERRORMASK)); 327 if (err) { 328 CLR(c, TTY_ERRORMASK); 329 if (ISSET(err, TTY_BI)) { 330 if (ISSET(iflag, IGNBRK)) 331 return (0); 332 if (ISSET(iflag, BRKINT)) { 333 ttyflush(tp, FREAD | FWRITE); 334 pgsignal(tp->t_pgrp, SIGINT, 1); 335 goto endcase; 336 } 337 if (ISSET(iflag, PARMRK)) 338 goto parmrk; 339 } else if ((ISSET(err, TTY_PE) && ISSET(iflag, INPCK)) 340 || ISSET(err, TTY_FE)) { 341 if (ISSET(iflag, IGNPAR)) 342 return (0); 343 else if (ISSET(iflag, PARMRK)) { 344parmrk: 345 if (tp->t_rawq.c_cc + tp->t_canq.c_cc > 346 MAX_INPUT - 3) 347 goto input_overflow; 348 (void)putc(0377 | TTY_QUOTE, &tp->t_rawq); 349 (void)putc(0 | TTY_QUOTE, &tp->t_rawq); 350 (void)putc(c | TTY_QUOTE, &tp->t_rawq); 351 goto endcase; 352 } else 353 c = 0; 354 } 355 } 356 357 if (!ISSET(tp->t_state, TS_TYPEN) && ISSET(iflag, ISTRIP)) 358 CLR(c, 0x80); 359 if (!ISSET(lflag, EXTPROC)) { 360 /* 361 * Check for literal nexting very first 362 */ 363 if (ISSET(tp->t_state, TS_LNCH)) { 364 SET(c, TTY_QUOTE); 365 CLR(tp->t_state, TS_LNCH); 366 } 367 /* 368 * Scan for special characters. This code 369 * is really just a big case statement with 370 * non-constant cases. The bottom of the 371 * case statement is labeled ``endcase'', so goto 372 * it after a case match, or similar. 373 */ 374 375 /* 376 * Control chars which aren't controlled 377 * by ICANON, ISIG, or IXON. 378 */ 379 if (ISSET(lflag, IEXTEN)) { 380 if (CCEQ(cc[VLNEXT], c)) { 381 if (ISSET(lflag, ECHO)) { 382 if (ISSET(lflag, ECHOE)) { 383 (void)ttyoutput('^', tp); 384 (void)ttyoutput('\b', tp); 385 } else 386 ttyecho(c, tp); 387 } 388 SET(tp->t_state, TS_LNCH); 389 goto endcase; 390 } 391 if (CCEQ(cc[VDISCARD], c)) { 392 if (ISSET(lflag, FLUSHO)) 393 CLR(tp->t_lflag, FLUSHO); 394 else { 395 ttyflush(tp, FWRITE); 396 ttyecho(c, tp); 397 if (tp->t_rawq.c_cc + tp->t_canq.c_cc) 398 ttyretype(tp); 399 SET(tp->t_lflag, FLUSHO); 400 } 401 goto startoutput; 402 } 403 } 404 /* 405 * Signals. 406 */ 407 if (ISSET(lflag, ISIG)) { 408 if (CCEQ(cc[VINTR], c) || CCEQ(cc[VQUIT], c)) { 409 if (!ISSET(lflag, NOFLSH)) 410 ttyflush(tp, FREAD | FWRITE); 411 ttyecho(c, tp); 412 pgsignal(tp->t_pgrp, 413 CCEQ(cc[VINTR], c) ? SIGINT : SIGQUIT, 1); 414 goto endcase; 415 } 416 if (CCEQ(cc[VSUSP], c)) { 417 if (!ISSET(lflag, NOFLSH)) 418 ttyflush(tp, FREAD); 419 ttyecho(c, tp); 420 pgsignal(tp->t_pgrp, SIGTSTP, 1); 421 goto endcase; 422 } 423 } 424 /* 425 * Handle start/stop characters. 426 */ 427 if (ISSET(iflag, IXON)) { 428 if (CCEQ(cc[VSTOP], c)) { 429 if (!ISSET(tp->t_state, TS_TTSTOP)) { 430 SET(tp->t_state, TS_TTSTOP); 431#ifdef sun4c /* XXX */ 432 (*tp->t_stop)(tp, 0); 433#else 434 (*cdevsw[major(tp->t_dev)]->d_stop)(tp, 435 0); 436#endif 437 return (0); 438 } 439 if (!CCEQ(cc[VSTART], c)) 440 return (0); 441 /* 442 * if VSTART == VSTOP then toggle 443 */ 444 goto endcase; 445 } 446 if (CCEQ(cc[VSTART], c)) 447 goto restartoutput; 448 } 449 /* 450 * IGNCR, ICRNL, & INLCR 451 */ 452 if (c == '\r') { 453 if (ISSET(iflag, IGNCR)) 454 return (0); 455 else if (ISSET(iflag, ICRNL)) 456 c = '\n'; 457 } else if (c == '\n' && ISSET(iflag, INLCR)) 458 c = '\r'; 459 } 460 if (!ISSET(tp->t_lflag, EXTPROC) && ISSET(lflag, ICANON)) { 461 /* 462 * From here on down canonical mode character 463 * processing takes place. 464 */ 465 /* 466 * erase (^H / ^?) 467 */ 468 if (CCEQ(cc[VERASE], c)) { 469 if (tp->t_rawq.c_cc) 470 ttyrub(unputc(&tp->t_rawq), tp); 471 goto endcase; 472 } 473 /* 474 * kill (^U) 475 */ 476 if (CCEQ(cc[VKILL], c)) { 477 if (ISSET(lflag, ECHOKE) && 478 tp->t_rawq.c_cc == tp->t_rocount && 479 !ISSET(lflag, ECHOPRT)) 480 while (tp->t_rawq.c_cc) 481 ttyrub(unputc(&tp->t_rawq), tp); 482 else { 483 ttyecho(c, tp); 484 if (ISSET(lflag, ECHOK) || 485 ISSET(lflag, ECHOKE)) 486 ttyecho('\n', tp); 487 FLUSHQ(&tp->t_rawq); 488 tp->t_rocount = 0; 489 } 490 CLR(tp->t_state, TS_LOCAL); 491 goto endcase; 492 } 493 /* 494 * word erase (^W) 495 */ 496 if (CCEQ(cc[VWERASE], c) && ISSET(lflag, IEXTEN)) { 497 int ctype; 498 499 /* 500 * erase whitespace 501 */ 502 while ((c = unputc(&tp->t_rawq)) == ' ' || c == '\t') 503 ttyrub(c, tp); 504 if (c == -1) 505 goto endcase; 506 /* 507 * erase last char of word and remember the 508 * next chars type (for ALTWERASE) 509 */ 510 ttyrub(c, tp); 511 c = unputc(&tp->t_rawq); 512 if (c == -1) 513 goto endcase; 514 if (c == ' ' || c == '\t') { 515 (void)putc(c, &tp->t_rawq); 516 goto endcase; 517 } 518 ctype = ISALPHA(c); 519 /* 520 * erase rest of word 521 */ 522 do { 523 ttyrub(c, tp); 524 c = unputc(&tp->t_rawq); 525 if (c == -1) 526 goto endcase; 527 } while (c != ' ' && c != '\t' && 528 (!ISSET(lflag, ALTWERASE) || ISALPHA(c) == ctype)); 529 (void)putc(c, &tp->t_rawq); 530 goto endcase; 531 } 532 /* 533 * reprint line (^R) 534 */ 535 if (CCEQ(cc[VREPRINT], c) && ISSET(lflag, IEXTEN)) { 536 ttyretype(tp); 537 goto endcase; 538 } 539 /* 540 * ^T - kernel info and generate SIGINFO 541 */ 542 if (CCEQ(cc[VSTATUS], c) && ISSET(lflag, IEXTEN)) { 543 if (ISSET(lflag, ISIG)) 544 pgsignal(tp->t_pgrp, SIGINFO, 1); 545 if (!ISSET(lflag, NOKERNINFO)) 546 ttyinfo(tp); 547 goto endcase; 548 } 549 } 550 /* 551 * Check for input buffer overflow 552 */ 553 if (tp->t_rawq.c_cc + tp->t_canq.c_cc >= MAX_INPUT) { 554input_overflow: 555 if (ISSET(iflag, IMAXBEL)) { 556 if (tp->t_outq.c_cc < tp->t_hiwat) 557 (void)ttyoutput(CTRL('g'), tp); 558 } 559 goto endcase; 560 } 561 562 if ( c == 0377 && ISSET(iflag, PARMRK) && !ISSET(iflag, ISTRIP) 563 && ISSET(iflag, IGNBRK|IGNPAR) != (IGNBRK|IGNPAR)) 564 (void)putc(0377 | TTY_QUOTE, &tp->t_rawq); 565 566 /* 567 * Put data char in q for user and 568 * wakeup on seeing a line delimiter. 569 */ 570 if (putc(c, &tp->t_rawq) >= 0) { 571 if (!ISSET(lflag, ICANON)) { 572 ttwakeup(tp); 573 ttyecho(c, tp); 574 goto endcase; 575 } 576 if (TTBREAKC(c, lflag)) { 577 tp->t_rocount = 0; 578 catq(&tp->t_rawq, &tp->t_canq); 579 ttwakeup(tp); 580 } else if (tp->t_rocount++ == 0) 581 tp->t_rocol = tp->t_column; 582 if (ISSET(tp->t_state, TS_ERASE)) { 583 /* 584 * end of prterase \.../ 585 */ 586 CLR(tp->t_state, TS_ERASE); 587 (void)ttyoutput('/', tp); 588 } 589 i = tp->t_column; 590 ttyecho(c, tp); 591 if (CCEQ(cc[VEOF], c) && ISSET(lflag, ECHO)) { 592 /* 593 * Place the cursor over the '^' of the ^D. 594 */ 595 i = imin(2, tp->t_column - i); 596 while (i > 0) { 597 (void)ttyoutput('\b', tp); 598 i--; 599 } 600 } 601 } 602endcase: 603 /* 604 * IXANY means allow any character to restart output. 605 */ 606 if (ISSET(tp->t_state, TS_TTSTOP) && 607 !ISSET(iflag, IXANY) && cc[VSTART] != cc[VSTOP]) 608 return (0); 609restartoutput: 610 CLR(tp->t_lflag, FLUSHO); 611 CLR(tp->t_state, TS_TTSTOP); 612startoutput: 613 return (ttstart(tp)); 614} 615 616/* 617 * Output a single character on a tty, doing output processing 618 * as needed (expanding tabs, newline processing, etc.). 619 * Returns < 0 if succeeds, otherwise returns char to resend. 620 * Must be recursive. 621 */ 622static int 623ttyoutput(c, tp) 624 register int c; 625 register struct tty *tp; 626{ 627 register tcflag_t oflag; 628 register int col, s; 629 630 oflag = tp->t_oflag; 631 if (!ISSET(oflag, OPOST)) { 632 if (ISSET(tp->t_lflag, FLUSHO)) 633 return (-1); 634 if (putc(c, &tp->t_outq)) 635 return (c); 636 tk_nout++; 637 tp->t_outcc++; 638 return (-1); 639 } 640 /* 641 * Do tab expansion if OXTABS is set. Special case if we external 642 * processing, we don't do the tab expansion because we'll probably 643 * get it wrong. If tab expansion needs to be done, let it happen 644 * externally. 645 */ 646 CLR(c, ~TTY_CHARMASK); 647 if (c == '\t' && 648 ISSET(oflag, OXTABS) && !ISSET(tp->t_lflag, EXTPROC)) { 649 c = 8 - (tp->t_column & 7); 650 if (!ISSET(tp->t_lflag, FLUSHO)) { 651 s = spltty(); /* Don't interrupt tabs. */ 652 c -= b_to_q(" ", c, &tp->t_outq); 653 tk_nout += c; 654 tp->t_outcc += c; 655 splx(s); 656 } 657 tp->t_column += c; 658 return (c ? -1 : '\t'); 659 } 660 if (c == CEOT && ISSET(oflag, ONOEOT)) 661 return (-1); 662 663 /* 664 * Newline translation: if ONLCR is set, 665 * translate newline into "\r\n". 666 */ 667 if (c == '\n' && ISSET(tp->t_oflag, ONLCR)) { 668 tk_nout++; 669 tp->t_outcc++; 670 if (putc('\r', &tp->t_outq)) 671 return (c); 672 } 673 tk_nout++; 674 tp->t_outcc++; 675 if (!ISSET(tp->t_lflag, FLUSHO) && putc(c, &tp->t_outq)) 676 return (c); 677 678 col = tp->t_column; 679 switch (CCLASS(c)) { 680 case BACKSPACE: 681 if (col > 0) 682 --col; 683 break; 684 case CONTROL: 685 break; 686 case NEWLINE: 687 case RETURN: 688 col = 0; 689 break; 690 case ORDINARY: 691 ++col; 692 break; 693 case TAB: 694 col = (col + 8) & ~7; 695 break; 696 } 697 tp->t_column = col; 698 return (-1); 699} 700 701/* 702 * Ioctls for all tty devices. Called after line-discipline specific ioctl 703 * has been called to do discipline-specific functions and/or reject any 704 * of these ioctl commands. 705 */ 706/* ARGSUSED */ 707int 708ttioctl(tp, cmd, data, flag) 709 register struct tty *tp; 710 int cmd, flag; 711 void *data; 712{ 713 register struct proc *p; 714 int s, error; 715 716 p = curproc; /* XXX */ 717 718 /* If the ioctl involves modification, hang if in the background. */ 719 switch (cmd) { 720 case TIOCFLUSH: 721 case TIOCSETA: 722 case TIOCSETD: 723 case TIOCSETAF: 724 case TIOCSETAW: 725#ifdef notdef 726 case TIOCSPGRP: 727#endif 728 case TIOCSTAT: 729 case TIOCSTI: 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 case TIOCEXCL: /* set exclusive use of tty */ 773 s = spltty(); 774 SET(tp->t_state, TS_XCLUDE); 775 splx(s); 776 break; 777 case TIOCFLUSH: { /* flush buffers */ 778 register int flags = *(int *)data; 779 780 if (flags == 0) 781 flags = FREAD | FWRITE; 782 else 783 flags &= FREAD | FWRITE; 784 ttyflush(tp, flags); 785 break; 786 } 787 case TIOCCONS: /* become virtual console */ 788 if (*(int *)data) { 789 if (constty && constty != tp && 790 ISSET(constty->t_state, TS_CONNECTED)) 791 return (EBUSY); 792#ifndef UCONSOLE 793 if (error = suser(p->p_ucred, &p->p_acflag)) 794 return (error); 795#endif 796 constty = tp; 797 } else if (tp == constty) 798 constty = NULL; 799 break; 800 case TIOCDRAIN: /* wait till output drained */ 801 error = ttywait(tp); 802 if (error) 803 return (error); 804 break; 805 case TIOCGETA: { /* get termios struct */ 806 struct termios *t = (struct termios *)data; 807 808 bcopy(&tp->t_termios, t, sizeof(struct termios)); 809 break; 810 } 811 case TIOCGETD: /* get line discipline */ 812 *(int *)data = tp->t_line; 813 break; 814 case TIOCGWINSZ: /* get window size */ 815 *(struct winsize *)data = tp->t_winsize; 816 break; 817 case TIOCGPGRP: /* get pgrp of tty */ 818 if (!isctty(p, tp)) 819 return (ENOTTY); 820 *(int *)data = tp->t_pgrp ? tp->t_pgrp->pg_id : NO_PID; 821 break; 822#ifdef TIOCHPCL 823 case TIOCHPCL: /* hang up on last close */ 824 s = spltty(); 825 SET(tp->t_cflag, HUPCL); 826 splx(s); 827 break; 828#endif 829 case TIOCNXCL: /* reset exclusive use of tty */ 830 s = spltty(); 831 CLR(tp->t_state, TS_XCLUDE); 832 splx(s); 833 break; 834 case TIOCOUTQ: /* output queue size */ 835 *(int *)data = tp->t_outq.c_cc; 836 break; 837 case TIOCSETA: /* set termios struct */ 838 case TIOCSETAW: /* drain output, set */ 839 case TIOCSETAF: { /* drn out, fls in, set */ 840 register struct termios *t = (struct termios *)data; 841 842 if (t->c_ispeed < 0 || t->c_ospeed < 0) 843 return (EINVAL); 844 s = spltty(); 845 if (cmd == TIOCSETAW || cmd == TIOCSETAF) { 846 error = ttywait(tp); 847 if (error) { 848 splx(s); 849 return (error); 850 } 851 if (cmd == TIOCSETAF) 852 ttyflush(tp, FREAD); 853 } 854 if (!ISSET(t->c_cflag, CIGNORE)) { 855 /* 856 * Set device hardware. 857 */ 858 if (tp->t_param && (error = (*tp->t_param)(tp, t))) { 859 splx(s); 860 return (error); 861 } 862 if (ISSET(t->c_cflag, CLOCAL) && 863 !ISSET(tp->t_cflag, CLOCAL)) { 864 /* 865 * XXX disconnections would be too hard to 866 * get rid of without this kludge. The only 867 * way to get rid of controlling terminals 868 * is to exit from the session leader. 869 */ 870 CLR(tp->t_state, TS_ZOMBIE); 871 872 wakeup(TSA_CARR_ON(tp)); 873 ttwakeup(tp); 874 ttwwakeup(tp); 875 } 876 if ((ISSET(tp->t_state, TS_CARR_ON) || 877 ISSET(t->c_cflag, CLOCAL)) && 878 !ISSET(tp->t_state, TS_ZOMBIE)) 879 SET(tp->t_state, TS_CONNECTED); 880 else 881 CLR(tp->t_state, TS_CONNECTED); 882 tp->t_cflag = t->c_cflag; 883 tp->t_ispeed = t->c_ispeed; 884 tp->t_ospeed = t->c_ospeed; 885 ttsetwater(tp); 886 } 887 if (ISSET(t->c_lflag, ICANON) != ISSET(tp->t_lflag, ICANON) && 888 cmd != TIOCSETAF) { 889 if (ISSET(t->c_lflag, ICANON)) 890 SET(tp->t_lflag, PENDIN); 891 else { 892 /* 893 * XXX we really shouldn't allow toggling 894 * ICANON while we're in a non-termios line 895 * discipline. Now we have to worry about 896 * panicing for a null queue. 897 */ 898 if (tp->t_canq.c_cbreserved > 0 && 899 tp->t_rawq.c_cbreserved > 0) { 900 catq(&tp->t_rawq, &tp->t_canq); 901 /* 902 * XXX the queue limits may be 903 * different, so the old queue 904 * swapping method no longer works. 905 */ 906 catq(&tp->t_canq, &tp->t_rawq); 907 } 908 CLR(tp->t_lflag, PENDIN); 909 } 910 ttwakeup(tp); 911 } 912 tp->t_iflag = t->c_iflag; 913 tp->t_oflag = t->c_oflag; 914 /* 915 * Make the EXTPROC bit read only. 916 */ 917 if (ISSET(tp->t_lflag, EXTPROC)) 918 SET(t->c_lflag, EXTPROC); 919 else 920 CLR(t->c_lflag, EXTPROC); 921 tp->t_lflag = t->c_lflag | ISSET(tp->t_lflag, PENDIN); 922 if (t->c_cc[VMIN] != tp->t_cc[VMIN] || 923 t->c_cc[VTIME] != tp->t_cc[VTIME]) 924 ttwakeup(tp); 925 bcopy(t->c_cc, tp->t_cc, sizeof(t->c_cc)); 926 splx(s); 927 break; 928 } 929 case TIOCSETD: { /* set line discipline */ 930 register int t = *(int *)data; 931 dev_t device = tp->t_dev; 932 933 if ((u_int)t >= nlinesw) 934 return (ENXIO); 935 if (t != tp->t_line) { 936 s = spltty(); 937 (*linesw[tp->t_line].l_close)(tp, flag); 938 error = (*linesw[t].l_open)(device, tp); 939 if (error) { 940 (void)(*linesw[tp->t_line].l_open)(device, tp); 941 splx(s); 942 return (error); 943 } 944 tp->t_line = t; 945 splx(s); 946 } 947 break; 948 } 949 case TIOCSTART: /* start output, like ^Q */ 950 s = spltty(); 951 if (ISSET(tp->t_state, TS_TTSTOP) || 952 ISSET(tp->t_lflag, FLUSHO)) { 953 CLR(tp->t_lflag, FLUSHO); 954 CLR(tp->t_state, TS_TTSTOP); 955 ttstart(tp); 956 } 957 splx(s); 958 break; 959 case TIOCSTI: /* simulate terminal input */ 960 if (p->p_ucred->cr_uid && (flag & FREAD) == 0) 961 return (EPERM); 962 if (p->p_ucred->cr_uid && !isctty(p, tp)) 963 return (EACCES); 964 s = spltty(); 965 (*linesw[tp->t_line].l_rint)(*(u_char *)data, tp); 966 splx(s); 967 break; 968 case TIOCSTOP: /* stop output, like ^S */ 969 s = spltty(); 970 if (!ISSET(tp->t_state, TS_TTSTOP)) { 971 SET(tp->t_state, TS_TTSTOP); 972#ifdef sun4c /* XXX */ 973 (*tp->t_stop)(tp, 0); 974#else 975 (*cdevsw[major(tp->t_dev)]->d_stop)(tp, 0); 976#endif 977 } 978 splx(s); 979 break; 980 case TIOCSCTTY: /* become controlling tty */ 981 /* Session ctty vnode pointer set in vnode layer. */ 982 if (!SESS_LEADER(p) || 983 ((p->p_session->s_ttyvp || tp->t_session) && 984 (tp->t_session != p->p_session))) 985 return (EPERM); 986 tp->t_session = p->p_session; 987 tp->t_pgrp = p->p_pgrp; 988 p->p_session->s_ttyp = tp; 989 p->p_flag |= P_CONTROLT; 990 break; 991 case TIOCSPGRP: { /* set pgrp of tty */ 992 register struct pgrp *pgrp = pgfind(*(int *)data); 993 994 if (!isctty(p, tp)) 995 return (ENOTTY); 996 else if (pgrp == NULL || pgrp->pg_session != p->p_session) 997 return (EPERM); 998 tp->t_pgrp = pgrp; 999 break; 1000 } 1001 case TIOCSTAT: /* simulate control-T */ 1002 s = spltty(); 1003 ttyinfo(tp); 1004 splx(s); 1005 break; 1006 case TIOCSWINSZ: /* set window size */ 1007 if (bcmp((caddr_t)&tp->t_winsize, data, 1008 sizeof (struct winsize))) { 1009 tp->t_winsize = *(struct winsize *)data; 1010 pgsignal(tp->t_pgrp, SIGWINCH, 1); 1011 } 1012 break; 1013 case TIOCSDRAINWAIT: 1014 error = suser(p->p_ucred, &p->p_acflag); 1015 if (error) 1016 return (error); 1017 tp->t_timeout = *(int *)data * hz; 1018 wakeup(TSA_OCOMPLETE(tp)); 1019 wakeup(TSA_OLOWAT(tp)); 1020 break; 1021 case TIOCGDRAINWAIT: 1022 *(int *)data = tp->t_timeout / hz; 1023 break; 1024 default: 1025#if defined(COMPAT_43) || defined(COMPAT_SUNOS) 1026 return (ttcompat(tp, cmd, data, flag)); 1027#else 1028 return (-1); 1029#endif 1030 } 1031 return (0); 1032} 1033 1034int 1035ttyselect(tp, rw, p) 1036 struct tty *tp; 1037 int rw; 1038 struct proc *p; 1039{ 1040 int s; 1041 1042 if (tp == NULL) 1043 return (ENXIO); 1044 1045 s = spltty(); 1046 switch (rw) { 1047 case FREAD: 1048 if (ttnread(tp) > 0 || ISSET(tp->t_state, TS_ZOMBIE)) 1049 goto win; 1050 selrecord(p, &tp->t_rsel); 1051 break; 1052 case FWRITE: 1053 if ((tp->t_outq.c_cc <= tp->t_lowat && 1054 ISSET(tp->t_state, TS_CONNECTED)) 1055 || ISSET(tp->t_state, TS_ZOMBIE)) { 1056win: splx(s); 1057 return (1); 1058 } 1059 selrecord(p, &tp->t_wsel); 1060 break; 1061 } 1062 splx(s); 1063 return (0); 1064} 1065 1066/* 1067 * This is a wrapper for compatibility with the select vector used by 1068 * cdevsw. It relies on a proper xxxdevtotty routine. 1069 */ 1070int 1071ttselect(dev, rw, p) 1072 dev_t dev; 1073 int rw; 1074 struct proc *p; 1075{ 1076 return ttyselect((*cdevsw[major(dev)]->d_devtotty)(dev), rw, p); 1077} 1078 1079/* 1080 * Must be called at spltty(). 1081 */ 1082static int 1083ttnread(tp) 1084 struct tty *tp; 1085{ 1086 int nread; 1087 1088 if (ISSET(tp->t_lflag, PENDIN)) 1089 ttypend(tp); 1090 nread = tp->t_canq.c_cc; 1091 if (!ISSET(tp->t_lflag, ICANON)) { 1092 nread += tp->t_rawq.c_cc; 1093 if (nread < tp->t_cc[VMIN] && tp->t_cc[VTIME] == 0) 1094 nread = 0; 1095 } 1096 return (nread); 1097} 1098 1099/* 1100 * Wait for output to drain. 1101 */ 1102int 1103ttywait(tp) 1104 register struct tty *tp; 1105{ 1106 int error, s; 1107 1108 error = 0; 1109 s = spltty(); 1110 while ((tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY)) && 1111 ISSET(tp->t_state, TS_CONNECTED) && tp->t_oproc) { 1112 (*tp->t_oproc)(tp); 1113 if ((tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY)) && 1114 ISSET(tp->t_state, TS_CONNECTED)) { 1115 SET(tp->t_state, TS_SO_OCOMPLETE); 1116 error = ttysleep(tp, TSA_OCOMPLETE(tp), 1117 TTOPRI | PCATCH, "ttywai", 1118 tp->t_timeout); 1119 if (error) { 1120 if (error == EWOULDBLOCK) 1121 error = EIO; 1122 break; 1123 } 1124 } else 1125 break; 1126 } 1127 if (!error && (tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY))) 1128 error = EIO; 1129 splx(s); 1130 return (error); 1131} 1132 1133/* 1134 * Flush if successfully wait. 1135 */ 1136static int 1137ttywflush(tp) 1138 struct tty *tp; 1139{ 1140 int error; 1141 1142 if ((error = ttywait(tp)) == 0) 1143 ttyflush(tp, FREAD); 1144 return (error); 1145} 1146 1147/* 1148 * Flush tty read and/or write queues, notifying anyone waiting. 1149 */ 1150void 1151ttyflush(tp, rw) 1152 register struct tty *tp; 1153 int rw; 1154{ 1155 register int s; 1156 1157 s = spltty(); 1158#if 0 1159again: 1160#endif 1161 if (rw & FWRITE) { 1162 FLUSHQ(&tp->t_outq); 1163 CLR(tp->t_state, TS_TTSTOP); 1164 } 1165#ifdef sun4c /* XXX */ 1166 (*tp->t_stop)(tp, rw); 1167#else 1168 (*cdevsw[major(tp->t_dev)]->d_stop)(tp, rw); 1169#endif 1170 if (rw & FREAD) { 1171 FLUSHQ(&tp->t_canq); 1172 FLUSHQ(&tp->t_rawq); 1173 CLR(tp->t_lflag, PENDIN); 1174 tp->t_rocount = 0; 1175 tp->t_rocol = 0; 1176 CLR(tp->t_state, TS_LOCAL); 1177 ttwakeup(tp); 1178 if (ISSET(tp->t_state, TS_TBLOCK)) { 1179 if (rw & FWRITE) 1180 FLUSHQ(&tp->t_outq); 1181 ttyunblock(tp); 1182 1183 /* 1184 * Don't let leave any state that might clobber the 1185 * next line discipline (although we should do more 1186 * to send the START char). Not clearing the state 1187 * may have caused the "putc to a clist with no 1188 * reserved cblocks" panic/printf. 1189 */ 1190 CLR(tp->t_state, TS_TBLOCK); 1191 1192#if 0 /* forget it, sleeping isn't always safe and we don't know when it is */ 1193 if (ISSET(tp->t_iflag, IXOFF)) { 1194 /* 1195 * XXX wait a bit in the hope that the stop 1196 * character (if any) will go out. Waiting 1197 * isn't good since it allows races. This 1198 * will be fixed when the stop character is 1199 * put in a special queue. Don't bother with 1200 * the checks in ttywait() since the timeout 1201 * will save us. 1202 */ 1203 SET(tp->t_state, TS_SO_OCOMPLETE); 1204 ttysleep(tp, TSA_OCOMPLETE(tp), TTOPRI, 1205 "ttyfls", hz / 10); 1206 /* 1207 * Don't try sending the stop character again. 1208 */ 1209 CLR(tp->t_state, TS_TBLOCK); 1210 goto again; 1211 } 1212#endif 1213 } 1214 } 1215 if (rw & FWRITE) { 1216 FLUSHQ(&tp->t_outq); 1217 ttwwakeup(tp); 1218 } 1219 splx(s); 1220} 1221 1222/* 1223 * Copy in the default termios characters. 1224 */ 1225void 1226termioschars(t) 1227 struct termios *t; 1228{ 1229 1230 bcopy(ttydefchars, t->c_cc, sizeof t->c_cc); 1231} 1232 1233/* 1234 * Old interface. 1235 */ 1236void 1237ttychars(tp) 1238 struct tty *tp; 1239{ 1240 1241 termioschars(&tp->t_termios); 1242} 1243 1244/* 1245 * Handle input high water. Send stop character for the IXOFF case. Turn 1246 * on our input flow control bit and propagate the changes to the driver. 1247 * XXX the stop character should be put in a special high priority queue. 1248 */ 1249void 1250ttyblock(tp) 1251 struct tty *tp; 1252{ 1253 1254 SET(tp->t_state, TS_TBLOCK); 1255 if (ISSET(tp->t_iflag, IXOFF) && tp->t_cc[VSTOP] != _POSIX_VDISABLE && 1256 putc(tp->t_cc[VSTOP], &tp->t_outq) != 0) 1257 CLR(tp->t_state, TS_TBLOCK); /* try again later */ 1258 ttstart(tp); 1259} 1260 1261/* 1262 * Handle input low water. Send start character for the IXOFF case. Turn 1263 * off our input flow control bit and propagate the changes to the driver. 1264 * XXX the start character should be put in a special high priority queue. 1265 */ 1266static void 1267ttyunblock(tp) 1268 struct tty *tp; 1269{ 1270 1271 CLR(tp->t_state, TS_TBLOCK); 1272 if (ISSET(tp->t_iflag, IXOFF) && tp->t_cc[VSTART] != _POSIX_VDISABLE && 1273 putc(tp->t_cc[VSTART], &tp->t_outq) != 0) 1274 SET(tp->t_state, TS_TBLOCK); /* try again later */ 1275 ttstart(tp); 1276} 1277 1278#ifdef notyet 1279/* Not used by any current (i386) drivers. */ 1280/* 1281 * Restart after an inter-char delay. 1282 */ 1283void 1284ttrstrt(tp_arg) 1285 void *tp_arg; 1286{ 1287 struct tty *tp; 1288 int s; 1289 1290#ifdef DIAGNOSTIC 1291 if (tp_arg == NULL) 1292 panic("ttrstrt"); 1293#endif 1294 tp = tp_arg; 1295 s = spltty(); 1296 1297 CLR(tp->t_state, TS_TIMEOUT); 1298 ttstart(tp); 1299 1300 splx(s); 1301} 1302#endif 1303 1304int 1305ttstart(tp) 1306 struct tty *tp; 1307{ 1308 1309 if (tp->t_oproc != NULL) /* XXX: Kludge for pty. */ 1310 (*tp->t_oproc)(tp); 1311 return (0); 1312} 1313 1314/* 1315 * "close" a line discipline 1316 */ 1317int 1318ttylclose(tp, flag) 1319 struct tty *tp; 1320 int flag; 1321{ 1322 1323 if (flag & FNONBLOCK || ttywflush(tp)) 1324 ttyflush(tp, FREAD | FWRITE); 1325 return (0); 1326} 1327 1328/* 1329 * Handle modem control transition on a tty. 1330 * Flag indicates new state of carrier. 1331 * Returns 0 if the line should be turned off, otherwise 1. 1332 */ 1333int 1334ttymodem(tp, flag) 1335 register struct tty *tp; 1336 int flag; 1337{ 1338 1339 if (ISSET(tp->t_state, TS_CARR_ON) && ISSET(tp->t_cflag, MDMBUF)) { 1340 /* 1341 * MDMBUF: do flow control according to carrier flag 1342 * XXX TS_CAR_OFLOW doesn't do anything yet. TS_TTSTOP 1343 * works if IXON and IXANY are clear. 1344 */ 1345 if (flag) { 1346 CLR(tp->t_state, TS_CAR_OFLOW); 1347 CLR(tp->t_state, TS_TTSTOP); 1348 ttstart(tp); 1349 } else if (!ISSET(tp->t_state, TS_CAR_OFLOW)) { 1350 SET(tp->t_state, TS_CAR_OFLOW); 1351 SET(tp->t_state, TS_TTSTOP); 1352#ifdef sun4c /* XXX */ 1353 (*tp->t_stop)(tp, 0); 1354#else 1355 (*cdevsw[major(tp->t_dev)]->d_stop)(tp, 0); 1356#endif 1357 } 1358 } else if (flag == 0) { 1359 /* 1360 * Lost carrier. 1361 */ 1362 CLR(tp->t_state, TS_CARR_ON); 1363 if (ISSET(tp->t_state, TS_ISOPEN) && 1364 !ISSET(tp->t_cflag, CLOCAL)) { 1365 SET(tp->t_state, TS_ZOMBIE); 1366 CLR(tp->t_state, TS_CONNECTED); 1367 if (tp->t_session && tp->t_session->s_leader) 1368 psignal(tp->t_session->s_leader, SIGHUP); 1369 ttyflush(tp, FREAD | FWRITE); 1370 return (0); 1371 } 1372 } else { 1373 /* 1374 * Carrier now on. 1375 */ 1376 SET(tp->t_state, TS_CARR_ON); 1377 if (!ISSET(tp->t_state, TS_ZOMBIE)) 1378 SET(tp->t_state, TS_CONNECTED); 1379 wakeup(TSA_CARR_ON(tp)); 1380 ttwakeup(tp); 1381 ttwwakeup(tp); 1382 } 1383 return (1); 1384} 1385 1386/* 1387 * Reinput pending characters after state switch 1388 * call at spltty(). 1389 */ 1390static void 1391ttypend(tp) 1392 register struct tty *tp; 1393{ 1394 struct clist tq; 1395 register int c; 1396 1397 CLR(tp->t_lflag, PENDIN); 1398 SET(tp->t_state, TS_TYPEN); 1399 /* 1400 * XXX this assumes too much about clist internals. It may even 1401 * fail if the cblock slush pool is empty. We can't allocate more 1402 * cblocks here because we are called from an interrupt handler 1403 * and clist_alloc_cblocks() can wait. 1404 */ 1405 tq = tp->t_rawq; 1406 bzero(&tp->t_rawq, sizeof tp->t_rawq); 1407 tp->t_rawq.c_cbmax = tq.c_cbmax; 1408 tp->t_rawq.c_cbreserved = tq.c_cbreserved; 1409 while ((c = getc(&tq)) >= 0) 1410 ttyinput(c, tp); 1411 CLR(tp->t_state, TS_TYPEN); 1412} 1413 1414/* 1415 * Process a read call on a tty device. 1416 */ 1417int 1418ttread(tp, uio, flag) 1419 register struct tty *tp; 1420 struct uio *uio; 1421 int flag; 1422{ 1423 register struct clist *qp; 1424 register int c; 1425 register tcflag_t lflag; 1426 register cc_t *cc = tp->t_cc; 1427 register struct proc *p = curproc; 1428 int s, first, error = 0; 1429 int has_stime = 0, last_cc = 0; 1430 long slp = 0; /* XXX this should be renamed `timo'. */ 1431 1432loop: 1433 s = spltty(); 1434 lflag = tp->t_lflag; 1435 /* 1436 * take pending input first 1437 */ 1438 if (ISSET(lflag, PENDIN)) { 1439 ttypend(tp); 1440 splx(s); /* reduce latency */ 1441 s = spltty(); 1442 lflag = tp->t_lflag; /* XXX ttypend() clobbers it */ 1443 } 1444 1445 /* 1446 * Hang process if it's in the background. 1447 */ 1448 if (isbackground(p, tp)) { 1449 splx(s); 1450 if ((p->p_sigignore & sigmask(SIGTTIN)) || 1451 (p->p_sigmask & sigmask(SIGTTIN)) || 1452 p->p_flag & P_PPWAIT || p->p_pgrp->pg_jobc == 0) 1453 return (EIO); 1454 pgsignal(p->p_pgrp, SIGTTIN, 1); 1455 error = ttysleep(tp, &lbolt, TTIPRI | PCATCH, "ttybg2", 0); 1456 if (error) 1457 return (error); 1458 goto loop; 1459 } 1460 1461 if (ISSET(tp->t_state, TS_ZOMBIE)) { 1462 splx(s); 1463 return (0); /* EOF */ 1464 } 1465 1466 /* 1467 * If canonical, use the canonical queue, 1468 * else use the raw queue. 1469 * 1470 * (should get rid of clists...) 1471 */ 1472 qp = ISSET(lflag, ICANON) ? &tp->t_canq : &tp->t_rawq; 1473 1474 if (flag & IO_NDELAY) { 1475 if (qp->c_cc > 0) 1476 goto read; 1477 if (!ISSET(lflag, ICANON) && cc[VMIN] == 0) { 1478 splx(s); 1479 return (0); 1480 } 1481 splx(s); 1482 return (EWOULDBLOCK); 1483 } 1484 if (!ISSET(lflag, ICANON)) { 1485 int m = cc[VMIN]; 1486 long t = cc[VTIME]; 1487 struct timeval stime, timecopy; 1488 int x; 1489 1490 /* 1491 * Check each of the four combinations. 1492 * (m > 0 && t == 0) is the normal read case. 1493 * It should be fairly efficient, so we check that and its 1494 * companion case (m == 0 && t == 0) first. 1495 * For the other two cases, we compute the target sleep time 1496 * into slp. 1497 */ 1498 if (t == 0) { 1499 if (qp->c_cc < m) 1500 goto sleep; 1501 if (qp->c_cc > 0) 1502 goto read; 1503 1504 /* m, t and qp->c_cc are all 0. 0 is enough input. */ 1505 splx(s); 1506 return (0); 1507 } 1508 t *= 100000; /* time in us */ 1509#define diff(t1, t2) (((t1).tv_sec - (t2).tv_sec) * 1000000 + \ 1510 ((t1).tv_usec - (t2).tv_usec)) 1511 if (m > 0) { 1512 if (qp->c_cc <= 0) 1513 goto sleep; 1514 if (qp->c_cc >= m) 1515 goto read; 1516 gettime(&timecopy); 1517 if (!has_stime) { 1518 /* first character, start timer */ 1519 has_stime = 1; 1520 stime = timecopy; 1521 slp = t; 1522 } else if (qp->c_cc > last_cc) { 1523 /* got a character, restart timer */ 1524 stime = timecopy; 1525 slp = t; 1526 } else { 1527 /* nothing, check expiration */ 1528 slp = t - diff(timecopy, stime); 1529 if (slp <= 0) 1530 goto read; 1531 } 1532 last_cc = qp->c_cc; 1533 } else { /* m == 0 */ 1534 if (qp->c_cc > 0) 1535 goto read; 1536 gettime(&timecopy); 1537 if (!has_stime) { 1538 has_stime = 1; 1539 stime = timecopy; 1540 slp = t; 1541 } else { 1542 slp = t - diff(timecopy, stime); 1543 if (slp <= 0) { 1544 /* Timed out, but 0 is enough input. */ 1545 splx(s); 1546 return (0); 1547 } 1548 } 1549 } 1550#undef diff 1551 /* 1552 * Rounding down may make us wake up just short 1553 * of the target, so we round up. 1554 * The formula is ceiling(slp * hz/1000000). 1555 * 32-bit arithmetic is enough for hz < 169. 1556 * XXX see hzto() for how to avoid overflow if hz 1557 * is large (divide by `tick' and/or arrange to 1558 * use hzto() if hz is large). 1559 */ 1560 slp = (long) (((u_long)slp * hz) + 999999) / 1000000; 1561 goto sleep; 1562 } 1563 if (qp->c_cc <= 0) { 1564sleep: 1565 /* 1566 * There is no input, or not enough input and we can block. 1567 */ 1568 error = ttysleep(tp, TSA_HUP_OR_INPUT(tp), TTIPRI | PCATCH, 1569 ISSET(tp->t_state, TS_CONNECTED) ? 1570 "ttyin" : "ttyhup", (int)slp); 1571 splx(s); 1572 if (error == EWOULDBLOCK) 1573 error = 0; 1574 else if (error) 1575 return (error); 1576 /* 1577 * XXX what happens if another process eats some input 1578 * while we are asleep (not just here)? It would be 1579 * safest to detect changes and reset our state variables 1580 * (has_stime and last_cc). 1581 */ 1582 slp = 0; 1583 goto loop; 1584 } 1585read: 1586 splx(s); 1587 /* 1588 * Input present, check for input mapping and processing. 1589 */ 1590 first = 1; 1591 if (ISSET(lflag, ICANON | ISIG)) 1592 goto slowcase; 1593 for (;;) { 1594 char ibuf[IBUFSIZ]; 1595 int icc; 1596 1597 icc = imin(uio->uio_resid, IBUFSIZ); 1598 icc = q_to_b(qp, ibuf, icc); 1599 if (icc <= 0) { 1600 if (first) 1601 goto loop; 1602 break; 1603 } 1604 error = uiomove(ibuf, icc, uio); 1605 /* 1606 * XXX if there was an error then we should ungetc() the 1607 * unmoved chars and reduce icc here. 1608 */ 1609#if NSNP > 0 1610 if (ISSET(tp->t_lflag, ECHO) && 1611 ISSET(tp->t_state, TS_SNOOP) && tp->t_sc != NULL) 1612 snpin((struct snoop *)tp->t_sc, ibuf, icc); 1613#endif 1614 if (error) 1615 break; 1616 if (uio->uio_resid == 0) 1617 break; 1618 first = 0; 1619 } 1620 goto out; 1621slowcase: 1622 for (;;) { 1623 c = getc(qp); 1624 if (c < 0) { 1625 if (first) 1626 goto loop; 1627 break; 1628 } 1629 /* 1630 * delayed suspend (^Y) 1631 */ 1632 if (CCEQ(cc[VDSUSP], c) && 1633 ISSET(lflag, IEXTEN | ISIG) == (IEXTEN | ISIG)) { 1634 pgsignal(tp->t_pgrp, SIGTSTP, 1); 1635 if (first) { 1636 error = ttysleep(tp, &lbolt, TTIPRI | PCATCH, 1637 "ttybg3", 0); 1638 if (error) 1639 break; 1640 goto loop; 1641 } 1642 break; 1643 } 1644 /* 1645 * Interpret EOF only in canonical mode. 1646 */ 1647 if (CCEQ(cc[VEOF], c) && ISSET(lflag, ICANON)) 1648 break; 1649 /* 1650 * Give user character. 1651 */ 1652 error = ureadc(c, uio); 1653 if (error) 1654 /* XXX should ungetc(c, qp). */ 1655 break; 1656#if NSNP > 0 1657 /* 1658 * Only snoop directly on input in echo mode. Non-echoed 1659 * input will be snooped later iff the application echoes it. 1660 */ 1661 if (ISSET(tp->t_lflag, ECHO) && 1662 ISSET(tp->t_state, TS_SNOOP) && tp->t_sc != NULL) 1663 snpinc((struct snoop *)tp->t_sc, (char)c); 1664#endif 1665 if (uio->uio_resid == 0) 1666 break; 1667 /* 1668 * In canonical mode check for a "break character" 1669 * marking the end of a "line of input". 1670 */ 1671 if (ISSET(lflag, ICANON) && TTBREAKC(c, lflag)) 1672 break; 1673 first = 0; 1674 } 1675 1676out: 1677 /* 1678 * Look to unblock input now that (presumably) 1679 * the input queue has gone down. 1680 */ 1681 s = spltty(); 1682 if (ISSET(tp->t_state, TS_TBLOCK) && 1683 tp->t_rawq.c_cc + tp->t_canq.c_cc <= I_LOW_WATER) 1684 ttyunblock(tp); 1685 splx(s); 1686 1687 return (error); 1688} 1689 1690/* 1691 * Check the output queue on tp for space for a kernel message (from uprintf 1692 * or tprintf). Allow some space over the normal hiwater mark so we don't 1693 * lose messages due to normal flow control, but don't let the tty run amok. 1694 * Sleeps here are not interruptible, but we return prematurely if new signals 1695 * arrive. 1696 */ 1697int 1698ttycheckoutq(tp, wait) 1699 register struct tty *tp; 1700 int wait; 1701{ 1702 int hiwat, s, oldsig; 1703 1704 hiwat = tp->t_hiwat; 1705 s = spltty(); 1706 oldsig = wait ? curproc->p_siglist : 0; 1707 if (tp->t_outq.c_cc > hiwat + OBUFSIZ + 100) 1708 while (tp->t_outq.c_cc > hiwat) { 1709 ttstart(tp); 1710 if (tp->t_outq.c_cc <= hiwat) 1711 break; 1712 if (wait == 0 || curproc->p_siglist != oldsig) { 1713 splx(s); 1714 return (0); 1715 } 1716 SET(tp->t_state, TS_SO_OLOWAT); 1717 tsleep(TSA_OLOWAT(tp), PZERO - 1, "ttoutq", hz); 1718 } 1719 splx(s); 1720 return (1); 1721} 1722 1723/* 1724 * Process a write call on a tty device. 1725 */ 1726int 1727ttwrite(tp, uio, flag) 1728 register struct tty *tp; 1729 register struct uio *uio; 1730 int flag; 1731{ 1732 register char *cp = NULL; 1733 register int cc, ce; 1734 register struct proc *p; 1735 int i, hiwat, cnt, error, s; 1736 char obuf[OBUFSIZ]; 1737 1738 hiwat = tp->t_hiwat; 1739 cnt = uio->uio_resid; 1740 error = 0; 1741 cc = 0; 1742loop: 1743 s = spltty(); 1744 if (ISSET(tp->t_state, TS_ZOMBIE)) { 1745 splx(s); 1746 if (uio->uio_resid == cnt) 1747 error = EIO; 1748 goto out; 1749 } 1750 if (!ISSET(tp->t_state, TS_CONNECTED)) { 1751 if (flag & IO_NDELAY) { 1752 splx(s); 1753 error = EWOULDBLOCK; 1754 goto out; 1755 } 1756 error = ttysleep(tp, TSA_CARR_ON(tp), TTIPRI | PCATCH, 1757 "ttydcd", 0); 1758 splx(s); 1759 if (error) 1760 goto out; 1761 goto loop; 1762 } 1763 splx(s); 1764 /* 1765 * Hang the process if it's in the background. 1766 */ 1767 p = curproc; 1768 if (isbackground(p, tp) && 1769 ISSET(tp->t_lflag, TOSTOP) && (p->p_flag & P_PPWAIT) == 0 && 1770 (p->p_sigignore & sigmask(SIGTTOU)) == 0 && 1771 (p->p_sigmask & sigmask(SIGTTOU)) == 0) { 1772 if (p->p_pgrp->pg_jobc == 0) { 1773 error = EIO; 1774 goto out; 1775 } 1776 pgsignal(p->p_pgrp, SIGTTOU, 1); 1777 error = ttysleep(tp, &lbolt, TTIPRI | PCATCH, "ttybg4", 0); 1778 if (error) 1779 goto out; 1780 goto loop; 1781 } 1782 /* 1783 * Process the user's data in at most OBUFSIZ chunks. Perform any 1784 * output translation. Keep track of high water mark, sleep on 1785 * overflow awaiting device aid in acquiring new space. 1786 */ 1787 while (uio->uio_resid > 0 || cc > 0) { 1788 if (ISSET(tp->t_lflag, FLUSHO)) { 1789 uio->uio_resid = 0; 1790 return (0); 1791 } 1792 if (tp->t_outq.c_cc > hiwat) 1793 goto ovhiwat; 1794 /* 1795 * Grab a hunk of data from the user, unless we have some 1796 * leftover from last time. 1797 */ 1798 if (cc == 0) { 1799 cc = imin(uio->uio_resid, OBUFSIZ); 1800 cp = obuf; 1801 error = uiomove(cp, cc, uio); 1802 if (error) { 1803 cc = 0; 1804 break; 1805 } 1806#if NSNP > 0 1807 if (ISSET(tp->t_state, TS_SNOOP) && tp->t_sc != NULL) 1808 snpin((struct snoop *)tp->t_sc, cp, cc); 1809#endif 1810 } 1811 /* 1812 * If nothing fancy need be done, grab those characters we 1813 * can handle without any of ttyoutput's processing and 1814 * just transfer them to the output q. For those chars 1815 * which require special processing (as indicated by the 1816 * bits in char_type), call ttyoutput. After processing 1817 * a hunk of data, look for FLUSHO so ^O's will take effect 1818 * immediately. 1819 */ 1820 while (cc > 0) { 1821 if (!ISSET(tp->t_oflag, OPOST)) 1822 ce = cc; 1823 else { 1824 ce = cc - scanc((u_int)cc, (u_char *)cp, 1825 char_type, CCLASSMASK); 1826 /* 1827 * If ce is zero, then we're processing 1828 * a special character through ttyoutput. 1829 */ 1830 if (ce == 0) { 1831 tp->t_rocount = 0; 1832 if (ttyoutput(*cp, tp) >= 0) { 1833 /* No Clists, wait a bit. */ 1834 ttstart(tp); 1835 if (flag & IO_NDELAY) { 1836 error = EWOULDBLOCK; 1837 goto out; 1838 } 1839 error = ttysleep(tp, &lbolt, 1840 TTOPRI|PCATCH, 1841 "ttybf1", 0); 1842 if (error) 1843 goto out; 1844 goto loop; 1845 } 1846 cp++; 1847 cc--; 1848 if (ISSET(tp->t_lflag, FLUSHO) || 1849 tp->t_outq.c_cc > hiwat) 1850 goto ovhiwat; 1851 continue; 1852 } 1853 } 1854 /* 1855 * A bunch of normal characters have been found. 1856 * Transfer them en masse to the output queue and 1857 * continue processing at the top of the loop. 1858 * If there are any further characters in this 1859 * <= OBUFSIZ chunk, the first should be a character 1860 * requiring special handling by ttyoutput. 1861 */ 1862 tp->t_rocount = 0; 1863 i = b_to_q(cp, ce, &tp->t_outq); 1864 ce -= i; 1865 tp->t_column += ce; 1866 cp += ce, cc -= ce, tk_nout += ce; 1867 tp->t_outcc += ce; 1868 if (i > 0) { 1869 /* No Clists, wait a bit. */ 1870 ttstart(tp); 1871 if (flag & IO_NDELAY) { 1872 error = EWOULDBLOCK; 1873 goto out; 1874 } 1875 error = ttysleep(tp, &lbolt, TTOPRI | PCATCH, 1876 "ttybf2", 0); 1877 if (error) 1878 goto out; 1879 goto loop; 1880 } 1881 if (ISSET(tp->t_lflag, FLUSHO) || 1882 tp->t_outq.c_cc > hiwat) 1883 break; 1884 } 1885 ttstart(tp); 1886 } 1887out: 1888 /* 1889 * If cc is nonzero, we leave the uio structure inconsistent, as the 1890 * offset and iov pointers have moved forward, but it doesn't matter 1891 * (the call will either return short or restart with a new uio). 1892 */ 1893 uio->uio_resid += cc; 1894 return (error); 1895 1896ovhiwat: 1897 ttstart(tp); 1898 s = spltty(); 1899 /* 1900 * This can only occur if FLUSHO is set in t_lflag, 1901 * or if ttstart/oproc is synchronous (or very fast). 1902 */ 1903 if (tp->t_outq.c_cc <= hiwat) { 1904 splx(s); 1905 goto loop; 1906 } 1907 if (flag & IO_NDELAY) { 1908 splx(s); 1909 uio->uio_resid += cc; 1910 return (uio->uio_resid == cnt ? EWOULDBLOCK : 0); 1911 } 1912 SET(tp->t_state, TS_SO_OLOWAT); 1913 error = ttysleep(tp, TSA_OLOWAT(tp), TTOPRI | PCATCH, "ttywri", 1914 tp->t_timeout); 1915 splx(s); 1916 if (error == EWOULDBLOCK) 1917 error = EIO; 1918 if (error) 1919 goto out; 1920 goto loop; 1921} 1922 1923/* 1924 * Rubout one character from the rawq of tp 1925 * as cleanly as possible. 1926 */ 1927static void 1928ttyrub(c, tp) 1929 register int c; 1930 register struct tty *tp; 1931{ 1932 register char *cp; 1933 register int savecol; 1934 int tabc, s; 1935 1936 if (!ISSET(tp->t_lflag, ECHO) || ISSET(tp->t_lflag, EXTPROC)) 1937 return; 1938 CLR(tp->t_lflag, FLUSHO); 1939 if (ISSET(tp->t_lflag, ECHOE)) { 1940 if (tp->t_rocount == 0) { 1941 /* 1942 * Screwed by ttwrite; retype 1943 */ 1944 ttyretype(tp); 1945 return; 1946 } 1947 if (c == ('\t' | TTY_QUOTE) || c == ('\n' | TTY_QUOTE)) 1948 ttyrubo(tp, 2); 1949 else { 1950 CLR(c, ~TTY_CHARMASK); 1951 switch (CCLASS(c)) { 1952 case ORDINARY: 1953 ttyrubo(tp, 1); 1954 break; 1955 case BACKSPACE: 1956 case CONTROL: 1957 case NEWLINE: 1958 case RETURN: 1959 case VTAB: 1960 if (ISSET(tp->t_lflag, ECHOCTL)) 1961 ttyrubo(tp, 2); 1962 break; 1963 case TAB: 1964 if (tp->t_rocount < tp->t_rawq.c_cc) { 1965 ttyretype(tp); 1966 return; 1967 } 1968 s = spltty(); 1969 savecol = tp->t_column; 1970 SET(tp->t_state, TS_CNTTB); 1971 SET(tp->t_lflag, FLUSHO); 1972 tp->t_column = tp->t_rocol; 1973 cp = tp->t_rawq.c_cf; 1974 if (cp) 1975 tabc = *cp; /* XXX FIX NEXTC */ 1976 for (; cp; cp = nextc(&tp->t_rawq, cp, &tabc)) 1977 ttyecho(tabc, tp); 1978 CLR(tp->t_lflag, FLUSHO); 1979 CLR(tp->t_state, TS_CNTTB); 1980 splx(s); 1981 1982 /* savecol will now be length of the tab. */ 1983 savecol -= tp->t_column; 1984 tp->t_column += savecol; 1985 if (savecol > 8) 1986 savecol = 8; /* overflow screw */ 1987 while (--savecol >= 0) 1988 (void)ttyoutput('\b', tp); 1989 break; 1990 default: /* XXX */ 1991#define PANICSTR "ttyrub: would panic c = %d, val = %d\n" 1992 (void)printf(PANICSTR, c, CCLASS(c)); 1993#ifdef notdef 1994 panic(PANICSTR, c, CCLASS(c)); 1995#endif 1996 } 1997 } 1998 } else if (ISSET(tp->t_lflag, ECHOPRT)) { 1999 if (!ISSET(tp->t_state, TS_ERASE)) { 2000 SET(tp->t_state, TS_ERASE); 2001 (void)ttyoutput('\\', tp); 2002 } 2003 ttyecho(c, tp); 2004 } else 2005 ttyecho(tp->t_cc[VERASE], tp); 2006 --tp->t_rocount; 2007} 2008 2009/* 2010 * Back over cnt characters, erasing them. 2011 */ 2012static void 2013ttyrubo(tp, cnt) 2014 register struct tty *tp; 2015 int cnt; 2016{ 2017 2018 while (cnt-- > 0) { 2019 (void)ttyoutput('\b', tp); 2020 (void)ttyoutput(' ', tp); 2021 (void)ttyoutput('\b', tp); 2022 } 2023} 2024 2025/* 2026 * ttyretype -- 2027 * Reprint the rawq line. Note, it is assumed that c_cc has already 2028 * been checked. 2029 */ 2030static void 2031ttyretype(tp) 2032 register struct tty *tp; 2033{ 2034 register char *cp; 2035 int s, c; 2036 2037 /* Echo the reprint character. */ 2038 if (tp->t_cc[VREPRINT] != _POSIX_VDISABLE) 2039 ttyecho(tp->t_cc[VREPRINT], tp); 2040 2041 (void)ttyoutput('\n', tp); 2042 2043 /* 2044 * XXX 2045 * FIX: NEXTC IS BROKEN - DOESN'T CHECK QUOTE 2046 * BIT OF FIRST CHAR. 2047 */ 2048 s = spltty(); 2049 for (cp = tp->t_canq.c_cf, c = (cp != NULL ? *cp : 0); 2050 cp != NULL; cp = nextc(&tp->t_canq, cp, &c)) 2051 ttyecho(c, tp); 2052 for (cp = tp->t_rawq.c_cf, c = (cp != NULL ? *cp : 0); 2053 cp != NULL; cp = nextc(&tp->t_rawq, cp, &c)) 2054 ttyecho(c, tp); 2055 CLR(tp->t_state, TS_ERASE); 2056 splx(s); 2057 2058 tp->t_rocount = tp->t_rawq.c_cc; 2059 tp->t_rocol = 0; 2060} 2061 2062/* 2063 * Echo a typed character to the terminal. 2064 */ 2065static void 2066ttyecho(c, tp) 2067 register int c; 2068 register struct tty *tp; 2069{ 2070 2071 if (!ISSET(tp->t_state, TS_CNTTB)) 2072 CLR(tp->t_lflag, FLUSHO); 2073 if ((!ISSET(tp->t_lflag, ECHO) && 2074 (c != '\n' || !ISSET(tp->t_lflag, ECHONL))) || 2075 ISSET(tp->t_lflag, EXTPROC)) 2076 return; 2077 if (ISSET(tp->t_lflag, ECHOCTL) && 2078 ((ISSET(c, TTY_CHARMASK) <= 037 && c != '\t' && c != '\n') || 2079 ISSET(c, TTY_CHARMASK) == 0177)) { 2080 (void)ttyoutput('^', tp); 2081 CLR(c, ~TTY_CHARMASK); 2082 if (c == 0177) 2083 c = '?'; 2084 else 2085 c += 'A' - 1; 2086 } 2087 (void)ttyoutput(c, tp); 2088} 2089 2090/* 2091 * Wake up any readers on a tty. 2092 */ 2093void 2094ttwakeup(tp) 2095 register struct tty *tp; 2096{ 2097 2098 if (tp->t_rsel.si_pid != 0) 2099 selwakeup(&tp->t_rsel); 2100 if (ISSET(tp->t_state, TS_ASYNC)) 2101 pgsignal(tp->t_pgrp, SIGIO, 1); 2102 wakeup(TSA_HUP_OR_INPUT(tp)); 2103} 2104 2105/* 2106 * Wake up any writers on a tty. 2107 */ 2108void 2109ttwwakeup(tp) 2110 register struct tty *tp; 2111{ 2112 2113 if (tp->t_wsel.si_pid != 0 && tp->t_outq.c_cc <= tp->t_lowat) 2114 selwakeup(&tp->t_wsel); 2115 if (ISSET(tp->t_state, TS_BUSY | TS_SO_OCOMPLETE) == 2116 TS_SO_OCOMPLETE && tp->t_outq.c_cc == 0) { 2117 CLR(tp->t_state, TS_SO_OCOMPLETE); 2118 wakeup(TSA_OCOMPLETE(tp)); 2119 } 2120 if (ISSET(tp->t_state, TS_SO_OLOWAT) && 2121 tp->t_outq.c_cc <= tp->t_lowat) { 2122 CLR(tp->t_state, TS_SO_OLOWAT); 2123 wakeup(TSA_OLOWAT(tp)); 2124 } 2125} 2126 2127/* 2128 * Look up a code for a specified speed in a conversion table; 2129 * used by drivers to map software speed values to hardware parameters. 2130 */ 2131int 2132ttspeedtab(speed, table) 2133 int speed; 2134 register struct speedtab *table; 2135{ 2136 2137 for ( ; table->sp_speed != -1; table++) 2138 if (table->sp_speed == speed) 2139 return (table->sp_code); 2140 return (-1); 2141} 2142 2143/* 2144 * Set tty hi and low water marks. 2145 * 2146 * Try to arrange the dynamics so there's about one second 2147 * from hi to low water. 2148 * 2149 */ 2150void 2151ttsetwater(tp) 2152 struct tty *tp; 2153{ 2154 register int cps, x; 2155 2156#define CLAMP(x, h, l) ((x) > h ? h : ((x) < l) ? l : (x)) 2157 2158 cps = tp->t_ospeed / 10; 2159 tp->t_lowat = x = CLAMP(cps / 2, TTMAXLOWAT, TTMINLOWAT); 2160 x += cps; 2161 x = CLAMP(x, TTMAXHIWAT, TTMINHIWAT); 2162 tp->t_hiwat = roundup(x, CBSIZE); 2163#undef CLAMP 2164} 2165 2166/* 2167 * Report on state of foreground process group. 2168 */ 2169void 2170ttyinfo(tp) 2171 register struct tty *tp; 2172{ 2173 register struct proc *p, *pick; 2174 struct timeval utime, stime; 2175 int tmp; 2176 2177 if (ttycheckoutq(tp,0) == 0) 2178 return; 2179 2180 /* Print load average. */ 2181 tmp = (averunnable.ldavg[0] * 100 + FSCALE / 2) >> FSHIFT; 2182 ttyprintf(tp, "load: %d.%02d ", tmp / 100, tmp % 100); 2183 2184 if (tp->t_session == NULL) 2185 ttyprintf(tp, "not a controlling terminal\n"); 2186 else if (tp->t_pgrp == NULL) 2187 ttyprintf(tp, "no foreground process group\n"); 2188 else if ((p = tp->t_pgrp->pg_members.lh_first) == 0) 2189 ttyprintf(tp, "empty foreground process group\n"); 2190 else { 2191 /* Pick interesting process. */ 2192 for (pick = NULL; p != 0; p = p->p_pglist.le_next) 2193 if (proc_compare(pick, p)) 2194 pick = p; 2195 2196 ttyprintf(tp, " cmd: %s %d [%s] ", pick->p_comm, pick->p_pid, 2197 pick->p_stat == SRUN ? "running" : 2198 pick->p_wmesg ? pick->p_wmesg : "iowait"); 2199 2200 calcru(pick, &utime, &stime, NULL); 2201 2202 /* Print user time. */ 2203 ttyprintf(tp, "%d.%02du ", 2204 utime.tv_sec, utime.tv_usec / 10000); 2205 2206 /* Print system time. */ 2207 ttyprintf(tp, "%d.%02ds ", 2208 stime.tv_sec, stime.tv_usec / 10000); 2209 2210#define pgtok(a) (((a) * PAGE_SIZE) / 1024) 2211 /* Print percentage cpu, resident set size. */ 2212 tmp = (pick->p_pctcpu * 10000 + FSCALE / 2) >> FSHIFT; 2213 ttyprintf(tp, "%d%% %dk\n", 2214 tmp / 100, 2215 pick->p_stat == SIDL || pick->p_stat == SZOMB ? 0 : 2216#ifdef pmap_resident_count 2217 pgtok(pmap_resident_count(&pick->p_vmspace->vm_pmap)) 2218#else 2219 pgtok(pick->p_vmspace->vm_rssize) 2220#endif 2221 ); 2222 } 2223 tp->t_rocount = 0; /* so pending input will be retyped if BS */ 2224} 2225 2226/* 2227 * Returns 1 if p2 is "better" than p1 2228 * 2229 * The algorithm for picking the "interesting" process is thus: 2230 * 2231 * 1) Only foreground processes are eligible - implied. 2232 * 2) Runnable processes are favored over anything else. The runner 2233 * with the highest cpu utilization is picked (p_estcpu). Ties are 2234 * broken by picking the highest pid. 2235 * 3) The sleeper with the shortest sleep time is next. With ties, 2236 * we pick out just "short-term" sleepers (P_SINTR == 0). 2237 * 4) Further ties are broken by picking the highest pid. 2238 */ 2239#define ISRUN(p) (((p)->p_stat == SRUN) || ((p)->p_stat == SIDL)) 2240#define TESTAB(a, b) ((a)<<1 | (b)) 2241#define ONLYA 2 2242#define ONLYB 1 2243#define BOTH 3 2244 2245static int 2246proc_compare(p1, p2) 2247 register struct proc *p1, *p2; 2248{ 2249 2250 if (p1 == NULL) 2251 return (1); 2252 /* 2253 * see if at least one of them is runnable 2254 */ 2255 switch (TESTAB(ISRUN(p1), ISRUN(p2))) { 2256 case ONLYA: 2257 return (0); 2258 case ONLYB: 2259 return (1); 2260 case BOTH: 2261 /* 2262 * tie - favor one with highest recent cpu utilization 2263 */ 2264 if (p2->p_estcpu > p1->p_estcpu) 2265 return (1); 2266 if (p1->p_estcpu > p2->p_estcpu) 2267 return (0); 2268 return (p2->p_pid > p1->p_pid); /* tie - return highest pid */ 2269 } 2270 /* 2271 * weed out zombies 2272 */ 2273 switch (TESTAB(p1->p_stat == SZOMB, p2->p_stat == SZOMB)) { 2274 case ONLYA: 2275 return (1); 2276 case ONLYB: 2277 return (0); 2278 case BOTH: 2279 return (p2->p_pid > p1->p_pid); /* tie - return highest pid */ 2280 } 2281 /* 2282 * pick the one with the smallest sleep time 2283 */ 2284 if (p2->p_slptime > p1->p_slptime) 2285 return (0); 2286 if (p1->p_slptime > p2->p_slptime) 2287 return (1); 2288 /* 2289 * favor one sleeping in a non-interruptible sleep 2290 */ 2291 if (p1->p_flag & P_SINTR && (p2->p_flag & P_SINTR) == 0) 2292 return (1); 2293 if (p2->p_flag & P_SINTR && (p1->p_flag & P_SINTR) == 0) 2294 return (0); 2295 return (p2->p_pid > p1->p_pid); /* tie - return highest pid */ 2296} 2297 2298/* 2299 * Output char to tty; console putchar style. 2300 */ 2301int 2302tputchar(c, tp) 2303 int c; 2304 struct tty *tp; 2305{ 2306 register int s; 2307 2308 s = spltty(); 2309 if (!ISSET(tp->t_state, TS_CONNECTED)) { 2310 splx(s); 2311 return (-1); 2312 } 2313 if (c == '\n') 2314 (void)ttyoutput('\r', tp); 2315 (void)ttyoutput(c, tp); 2316 ttstart(tp); 2317 splx(s); 2318 return (0); 2319} 2320 2321/* 2322 * Sleep on chan, returning ERESTART if tty changed while we napped and 2323 * returning any errors (e.g. EINTR/EWOULDBLOCK) reported by tsleep. If 2324 * the tty is revoked, restarting a pending call will redo validation done 2325 * at the start of the call. 2326 */ 2327int 2328ttysleep(tp, chan, pri, wmesg, timo) 2329 struct tty *tp; 2330 void *chan; 2331 int pri, timo; 2332 char *wmesg; 2333{ 2334 int error; 2335 int gen; 2336 2337 gen = tp->t_gen; 2338 error = tsleep(chan, pri, wmesg, timo); 2339 if (error) 2340 return (error); 2341 return (tp->t_gen == gen ? 0 : ERESTART); 2342} 2343 2344#ifdef notyet 2345/* 2346 * XXX this is usable not useful or used. Most tty drivers have 2347 * ifdefs for using ttymalloc() but assume a different interface. 2348 */ 2349/* 2350 * Allocate a tty struct. Clists in the struct will be allocated by 2351 * ttyopen(). 2352 */ 2353struct tty * 2354ttymalloc() 2355{ 2356 struct tty *tp; 2357 2358 tp = malloc(sizeof *tp, M_TTYS, M_WAITOK); 2359 bzero(tp, sizeof *tp); 2360 return (tp); 2361} 2362#endif 2363 2364#if 0 /* XXX not yet usable: session leader holds a ref (see kern_exit.c). */ 2365/* 2366 * Free a tty struct. Clists in the struct should have been freed by 2367 * ttyclose(). 2368 */ 2369void 2370ttyfree(tp) 2371 struct tty *tp; 2372{ 2373 free(tp, M_TTYS); 2374} 2375#endif /* 0 */ 2376