tty.c revision 15543
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 1.80 1996/03/11 06:05:03 hsu 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 <vm/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 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) \ 277 ((c) == '\n' || (((c) == cc[VEOF] || \ 278 (c) == cc[VEOL] || (c) == cc[VEOL2]) && (c) != _POSIX_VDISABLE)) 279 280/* 281 * Process input of a single character received on a tty. 282 */ 283int 284ttyinput(c, tp) 285 register int c; 286 register struct tty *tp; 287{ 288 register tcflag_t iflag, lflag; 289 register cc_t *cc; 290 int i, err; 291 292 /* 293 * If input is pending take it first. 294 */ 295 lflag = tp->t_lflag; 296 if (ISSET(lflag, PENDIN)) 297 ttypend(tp); 298 /* 299 * Gather stats. 300 */ 301 if (ISSET(lflag, ICANON)) { 302 ++tk_cancc; 303 ++tp->t_cancc; 304 } else { 305 ++tk_rawcc; 306 ++tp->t_rawcc; 307 } 308 ++tk_nin; 309 310 /* 311 * Block further input iff: 312 * current input > threshold AND input is available to user program 313 * AND input flow control is enabled and not yet invoked. 314 * The 3 is slop for PARMRK. 315 */ 316 iflag = tp->t_iflag; 317 if (tp->t_rawq.c_cc + tp->t_canq.c_cc > I_HIGH_WATER - 3 && 318 (!ISSET(lflag, ICANON) || tp->t_canq.c_cc != 0) && 319 (ISSET(tp->t_cflag, CRTS_IFLOW) || ISSET(iflag, IXOFF)) && 320 !ISSET(tp->t_state, TS_TBLOCK)) 321 ttyblock(tp); 322 323 /* Handle exceptional conditions (break, parity, framing). */ 324 cc = tp->t_cc; 325 err = (ISSET(c, TTY_ERRORMASK)); 326 if (err) { 327 CLR(c, TTY_ERRORMASK); 328 if (ISSET(err, TTY_BI)) { /* Break. */ 329 if (ISSET(iflag, IGNBRK)) 330 return (0); 331 else if (ISSET(iflag, BRKINT) && 332 ISSET(lflag, ISIG) && 333 (cc[VINTR] != _POSIX_VDISABLE)) 334 c = cc[VINTR]; 335 else if (ISSET(iflag, PARMRK)) 336 goto parmrk; 337 } else if ((ISSET(err, TTY_PE) && ISSET(iflag, INPCK)) 338 || ISSET(err, TTY_FE)) { 339 if (ISSET(iflag, IGNPAR)) 340 return (0); 341 else if (ISSET(iflag, PARMRK)) { 342parmrk: 343 if (tp->t_rawq.c_cc + tp->t_canq.c_cc > 344 MAX_INPUT - 3) 345 goto input_overflow; 346 (void)putc(0377 | TTY_QUOTE, &tp->t_rawq); 347 (void)putc(0 | TTY_QUOTE, &tp->t_rawq); 348 (void)putc(c | TTY_QUOTE, &tp->t_rawq); 349 goto endcase; 350 } else 351 c = 0; 352 } 353 } 354 355 if (!ISSET(tp->t_state, TS_TYPEN) && ISSET(iflag, ISTRIP)) 356 CLR(c, 0x80); 357 if (!ISSET(lflag, EXTPROC)) { 358 /* 359 * Check for literal nexting very first 360 */ 361 if (ISSET(tp->t_state, TS_LNCH)) { 362 SET(c, TTY_QUOTE); 363 CLR(tp->t_state, TS_LNCH); 364 } 365 /* 366 * Scan for special characters. This code 367 * is really just a big case statement with 368 * non-constant cases. The bottom of the 369 * case statement is labeled ``endcase'', so goto 370 * it after a case match, or similar. 371 */ 372 373 /* 374 * Control chars which aren't controlled 375 * by ICANON, ISIG, or IXON. 376 */ 377 if (ISSET(lflag, IEXTEN)) { 378 if (CCEQ(cc[VLNEXT], c)) { 379 if (ISSET(lflag, ECHO)) { 380 if (ISSET(lflag, ECHOE)) { 381 (void)ttyoutput('^', tp); 382 (void)ttyoutput('\b', tp); 383 } else 384 ttyecho(c, tp); 385 } 386 SET(tp->t_state, TS_LNCH); 387 goto endcase; 388 } 389 if (CCEQ(cc[VDISCARD], c)) { 390 if (ISSET(lflag, FLUSHO)) 391 CLR(tp->t_lflag, FLUSHO); 392 else { 393 ttyflush(tp, FWRITE); 394 ttyecho(c, tp); 395 if (tp->t_rawq.c_cc + tp->t_canq.c_cc) 396 ttyretype(tp); 397 SET(tp->t_lflag, FLUSHO); 398 } 399 goto startoutput; 400 } 401 } 402 /* 403 * Signals. 404 */ 405 if (ISSET(lflag, ISIG)) { 406 if (CCEQ(cc[VINTR], c) || CCEQ(cc[VQUIT], c)) { 407 if (!ISSET(lflag, NOFLSH)) 408 ttyflush(tp, FREAD | FWRITE); 409 ttyecho(c, tp); 410 pgsignal(tp->t_pgrp, 411 CCEQ(cc[VINTR], c) ? SIGINT : SIGQUIT, 1); 412 goto endcase; 413 } 414 if (CCEQ(cc[VSUSP], c)) { 415 if (!ISSET(lflag, NOFLSH)) 416 ttyflush(tp, FREAD); 417 ttyecho(c, tp); 418 pgsignal(tp->t_pgrp, SIGTSTP, 1); 419 goto endcase; 420 } 421 } 422 /* 423 * Handle start/stop characters. 424 */ 425 if (ISSET(iflag, IXON)) { 426 if (CCEQ(cc[VSTOP], c)) { 427 if (!ISSET(tp->t_state, TS_TTSTOP)) { 428 SET(tp->t_state, TS_TTSTOP); 429#ifdef sun4c /* XXX */ 430 (*tp->t_stop)(tp, 0); 431#else 432 (*cdevsw[major(tp->t_dev)]->d_stop)(tp, 433 0); 434#endif 435 return (0); 436 } 437 if (!CCEQ(cc[VSTART], c)) 438 return (0); 439 /* 440 * if VSTART == VSTOP then toggle 441 */ 442 goto endcase; 443 } 444 if (CCEQ(cc[VSTART], c)) 445 goto restartoutput; 446 } 447 /* 448 * IGNCR, ICRNL, & INLCR 449 */ 450 if (c == '\r') { 451 if (ISSET(iflag, IGNCR)) 452 return (0); 453 else if (ISSET(iflag, ICRNL)) 454 c = '\n'; 455 } else if (c == '\n' && ISSET(iflag, INLCR)) 456 c = '\r'; 457 } 458 if (!ISSET(tp->t_lflag, EXTPROC) && ISSET(lflag, ICANON)) { 459 /* 460 * From here on down canonical mode character 461 * processing takes place. 462 */ 463 /* 464 * erase (^H / ^?) 465 */ 466 if (CCEQ(cc[VERASE], c)) { 467 if (tp->t_rawq.c_cc) 468 ttyrub(unputc(&tp->t_rawq), tp); 469 goto endcase; 470 } 471 /* 472 * kill (^U) 473 */ 474 if (CCEQ(cc[VKILL], c)) { 475 if (ISSET(lflag, ECHOKE) && 476 tp->t_rawq.c_cc == tp->t_rocount && 477 !ISSET(lflag, ECHOPRT)) 478 while (tp->t_rawq.c_cc) 479 ttyrub(unputc(&tp->t_rawq), tp); 480 else { 481 ttyecho(c, tp); 482 if (ISSET(lflag, ECHOK) || 483 ISSET(lflag, ECHOKE)) 484 ttyecho('\n', tp); 485 FLUSHQ(&tp->t_rawq); 486 tp->t_rocount = 0; 487 } 488 CLR(tp->t_state, TS_LOCAL); 489 goto endcase; 490 } 491 /* 492 * word erase (^W) 493 */ 494 if (CCEQ(cc[VWERASE], c)) { 495 int ctype; 496 497 /* 498 * erase whitespace 499 */ 500 while ((c = unputc(&tp->t_rawq)) == ' ' || c == '\t') 501 ttyrub(c, tp); 502 if (c == -1) 503 goto endcase; 504 /* 505 * erase last char of word and remember the 506 * next chars type (for ALTWERASE) 507 */ 508 ttyrub(c, tp); 509 c = unputc(&tp->t_rawq); 510 if (c == -1) 511 goto endcase; 512 if (c == ' ' || c == '\t') { 513 (void)putc(c, &tp->t_rawq); 514 goto endcase; 515 } 516 ctype = ISALPHA(c); 517 /* 518 * erase rest of word 519 */ 520 do { 521 ttyrub(c, tp); 522 c = unputc(&tp->t_rawq); 523 if (c == -1) 524 goto endcase; 525 } while (c != ' ' && c != '\t' && 526 (!ISSET(lflag, ALTWERASE) || ISALPHA(c) == ctype)); 527 (void)putc(c, &tp->t_rawq); 528 goto endcase; 529 } 530 /* 531 * reprint line (^R) 532 */ 533 if (CCEQ(cc[VREPRINT], c)) { 534 ttyretype(tp); 535 goto endcase; 536 } 537 /* 538 * ^T - kernel info and generate SIGINFO 539 */ 540 if (CCEQ(cc[VSTATUS], c)) { 541 if (ISSET(lflag, ISIG)) 542 pgsignal(tp->t_pgrp, SIGINFO, 1); 543 if (!ISSET(lflag, NOKERNINFO)) 544 ttyinfo(tp); 545 goto endcase; 546 } 547 } 548 /* 549 * Check for input buffer overflow 550 */ 551 if (tp->t_rawq.c_cc + tp->t_canq.c_cc >= MAX_INPUT) { 552input_overflow: 553 if (ISSET(iflag, IMAXBEL)) { 554 if (tp->t_outq.c_cc < tp->t_hiwat) 555 (void)ttyoutput(CTRL('g'), tp); 556 } 557 goto endcase; 558 } 559 560 if ( c == 0377 && ISSET(iflag, PARMRK) && !ISSET(iflag, ISTRIP) 561 && ISSET(iflag, IGNBRK|IGNPAR) != (IGNBRK|IGNPAR)) 562 (void)putc(0377 | TTY_QUOTE, &tp->t_rawq); 563 564 /* 565 * Put data char in q for user and 566 * wakeup on seeing a line delimiter. 567 */ 568 if (putc(c, &tp->t_rawq) >= 0) { 569 if (!ISSET(lflag, ICANON)) { 570 ttwakeup(tp); 571 ttyecho(c, tp); 572 goto endcase; 573 } 574 if (TTBREAKC(c)) { 575 tp->t_rocount = 0; 576 catq(&tp->t_rawq, &tp->t_canq); 577 ttwakeup(tp); 578 } else if (tp->t_rocount++ == 0) 579 tp->t_rocol = tp->t_column; 580 if (ISSET(tp->t_state, TS_ERASE)) { 581 /* 582 * end of prterase \.../ 583 */ 584 CLR(tp->t_state, TS_ERASE); 585 (void)ttyoutput('/', tp); 586 } 587 i = tp->t_column; 588 ttyecho(c, tp); 589 if (CCEQ(cc[VEOF], c) && ISSET(lflag, ECHO)) { 590 /* 591 * Place the cursor over the '^' of the ^D. 592 */ 593 i = imin(2, tp->t_column - i); 594 while (i > 0) { 595 (void)ttyoutput('\b', tp); 596 i--; 597 } 598 } 599 } 600endcase: 601 /* 602 * IXANY means allow any character to restart output. 603 */ 604 if (ISSET(tp->t_state, TS_TTSTOP) && 605 !ISSET(iflag, IXANY) && cc[VSTART] != cc[VSTOP]) 606 return (0); 607restartoutput: 608 CLR(tp->t_lflag, FLUSHO); 609 CLR(tp->t_state, TS_TTSTOP); 610startoutput: 611 return (ttstart(tp)); 612} 613 614/* 615 * Output a single character on a tty, doing output processing 616 * as needed (expanding tabs, newline processing, etc.). 617 * Returns < 0 if succeeds, otherwise returns char to resend. 618 * Must be recursive. 619 */ 620static int 621ttyoutput(c, tp) 622 register int c; 623 register struct tty *tp; 624{ 625 register tcflag_t oflag; 626 register int col, s; 627 628 oflag = tp->t_oflag; 629 if (!ISSET(oflag, OPOST)) { 630 if (ISSET(tp->t_lflag, FLUSHO)) 631 return (-1); 632 if (putc(c, &tp->t_outq)) 633 return (c); 634 tk_nout++; 635 tp->t_outcc++; 636 return (-1); 637 } 638 /* 639 * Do tab expansion if OXTABS is set. Special case if we external 640 * processing, we don't do the tab expansion because we'll probably 641 * get it wrong. If tab expansion needs to be done, let it happen 642 * externally. 643 */ 644 CLR(c, ~TTY_CHARMASK); 645 if (c == '\t' && 646 ISSET(oflag, OXTABS) && !ISSET(tp->t_lflag, EXTPROC)) { 647 c = 8 - (tp->t_column & 7); 648 if (!ISSET(tp->t_lflag, FLUSHO)) { 649 s = spltty(); /* Don't interrupt tabs. */ 650 c -= b_to_q(" ", c, &tp->t_outq); 651 tk_nout += c; 652 tp->t_outcc += c; 653 splx(s); 654 } 655 tp->t_column += c; 656 return (c ? -1 : '\t'); 657 } 658 if (c == CEOT && ISSET(oflag, ONOEOT)) 659 return (-1); 660 661 /* 662 * Newline translation: if ONLCR is set, 663 * translate newline into "\r\n". 664 */ 665 if (c == '\n' && ISSET(tp->t_oflag, ONLCR)) { 666 tk_nout++; 667 tp->t_outcc++; 668 if (putc('\r', &tp->t_outq)) 669 return (c); 670 } 671 tk_nout++; 672 tp->t_outcc++; 673 if (!ISSET(tp->t_lflag, FLUSHO) && putc(c, &tp->t_outq)) 674 return (c); 675 676 col = tp->t_column; 677 switch (CCLASS(c)) { 678 case BACKSPACE: 679 if (col > 0) 680 --col; 681 break; 682 case CONTROL: 683 break; 684 case NEWLINE: 685 case RETURN: 686 col = 0; 687 break; 688 case ORDINARY: 689 ++col; 690 break; 691 case TAB: 692 col = (col + 8) & ~7; 693 break; 694 } 695 tp->t_column = col; 696 return (-1); 697} 698 699/* 700 * Ioctls for all tty devices. Called after line-discipline specific ioctl 701 * has been called to do discipline-specific functions and/or reject any 702 * of these ioctl commands. 703 */ 704/* ARGSUSED */ 705int 706ttioctl(tp, cmd, data, flag) 707 register struct tty *tp; 708 int cmd, flag; 709 void *data; 710{ 711 register struct proc *p; 712 int s, error; 713 714 p = curproc; /* XXX */ 715 716 /* If the ioctl involves modification, hang if in the background. */ 717 switch (cmd) { 718 case TIOCFLUSH: 719 case TIOCSETA: 720 case TIOCSETD: 721 case TIOCSETAF: 722 case TIOCSETAW: 723#ifdef notdef 724 case TIOCSPGRP: 725#endif 726 case TIOCSTAT: 727 case TIOCSTI: 728 case TIOCSWINSZ: 729#if defined(COMPAT_43) || defined(COMPAT_SUNOS) 730 case TIOCLBIC: 731 case TIOCLBIS: 732 case TIOCLSET: 733 case TIOCSETC: 734 case OTIOCSETD: 735 case TIOCSETN: 736 case TIOCSETP: 737 case TIOCSLTC: 738#endif 739 while (isbackground(curproc, tp) && 740 p->p_pgrp->pg_jobc && (p->p_flag & P_PPWAIT) == 0 && 741 (p->p_sigignore & sigmask(SIGTTOU)) == 0 && 742 (p->p_sigmask & sigmask(SIGTTOU)) == 0) { 743 pgsignal(p->p_pgrp, SIGTTOU, 1); 744 error = ttysleep(tp, &lbolt, TTOPRI | PCATCH, "ttybg1", 745 0); 746 if (error) 747 return (error); 748 } 749 break; 750 } 751 752 switch (cmd) { /* Process the ioctl. */ 753 case FIOASYNC: /* set/clear async i/o */ 754 s = spltty(); 755 if (*(int *)data) 756 SET(tp->t_state, TS_ASYNC); 757 else 758 CLR(tp->t_state, TS_ASYNC); 759 splx(s); 760 break; 761 case FIONBIO: /* set/clear non-blocking i/o */ 762 break; /* XXX: delete. */ 763 case FIONREAD: /* get # bytes to read */ 764 s = spltty(); 765 *(int *)data = ttnread(tp); 766 splx(s); 767 break; 768 case TIOCEXCL: /* set exclusive use of tty */ 769 s = spltty(); 770 SET(tp->t_state, TS_XCLUDE); 771 splx(s); 772 break; 773 case TIOCFLUSH: { /* flush buffers */ 774 register int flags = *(int *)data; 775 776 if (flags == 0) 777 flags = FREAD | FWRITE; 778 else 779 flags &= FREAD | FWRITE; 780 ttyflush(tp, flags); 781 break; 782 } 783 case TIOCCONS: /* become virtual console */ 784 if (*(int *)data) { 785 if (constty && constty != tp && 786 ISSET(constty->t_state, TS_CONNECTED)) 787 return (EBUSY); 788#ifndef UCONSOLE 789 if (error = suser(p->p_ucred, &p->p_acflag)) 790 return (error); 791#endif 792 constty = tp; 793 } else if (tp == constty) 794 constty = NULL; 795 break; 796 case TIOCDRAIN: /* wait till output drained */ 797 error = ttywait(tp); 798 if (error) 799 return (error); 800 break; 801 case TIOCGETA: { /* get termios struct */ 802 struct termios *t = (struct termios *)data; 803 804 bcopy(&tp->t_termios, t, sizeof(struct termios)); 805 break; 806 } 807 case TIOCGETD: /* get line discipline */ 808 *(int *)data = tp->t_line; 809 break; 810 case TIOCGWINSZ: /* get window size */ 811 *(struct winsize *)data = tp->t_winsize; 812 break; 813 case TIOCGPGRP: /* get pgrp of tty */ 814 if (!isctty(p, tp)) 815 return (ENOTTY); 816 *(int *)data = tp->t_pgrp ? tp->t_pgrp->pg_id : NO_PID; 817 break; 818#ifdef TIOCHPCL 819 case TIOCHPCL: /* hang up on last close */ 820 s = spltty(); 821 SET(tp->t_cflag, HUPCL); 822 splx(s); 823 break; 824#endif 825 case TIOCNXCL: /* reset exclusive use of tty */ 826 s = spltty(); 827 CLR(tp->t_state, TS_XCLUDE); 828 splx(s); 829 break; 830 case TIOCOUTQ: /* output queue size */ 831 *(int *)data = tp->t_outq.c_cc; 832 break; 833 case TIOCSETA: /* set termios struct */ 834 case TIOCSETAW: /* drain output, set */ 835 case TIOCSETAF: { /* drn out, fls in, set */ 836 register struct termios *t = (struct termios *)data; 837 838 if (t->c_ispeed < 0 || t->c_ospeed < 0) 839 return (EINVAL); 840 s = spltty(); 841 if (cmd == TIOCSETAW || cmd == TIOCSETAF) { 842 error = ttywait(tp); 843 if (error) { 844 splx(s); 845 return (error); 846 } 847 if (cmd == TIOCSETAF) 848 ttyflush(tp, FREAD); 849 } 850 if (!ISSET(t->c_cflag, CIGNORE)) { 851 /* 852 * Set device hardware. 853 */ 854 if (tp->t_param && (error = (*tp->t_param)(tp, t))) { 855 splx(s); 856 return (error); 857 } 858 if (ISSET(t->c_cflag, CLOCAL) && 859 !ISSET(tp->t_cflag, CLOCAL)) { 860 /* 861 * XXX disconnections would be too hard to 862 * get rid of without this kludge. The only 863 * way to get rid of controlling terminals 864 * is to exit from the session leader. 865 */ 866 CLR(tp->t_state, TS_ZOMBIE); 867 868 wakeup(TSA_CARR_ON(tp)); 869 ttwakeup(tp); 870 ttwwakeup(tp); 871 } 872 if ((ISSET(tp->t_state, TS_CARR_ON) || 873 ISSET(t->c_cflag, CLOCAL)) && 874 !ISSET(tp->t_state, TS_ZOMBIE)) 875 SET(tp->t_state, TS_CONNECTED); 876 else 877 CLR(tp->t_state, TS_CONNECTED); 878 tp->t_cflag = t->c_cflag; 879 tp->t_ispeed = t->c_ispeed; 880 tp->t_ospeed = t->c_ospeed; 881 ttsetwater(tp); 882 } 883 if (ISSET(t->c_lflag, ICANON) != ISSET(tp->t_lflag, ICANON) && 884 cmd != TIOCSETAF) { 885 if (ISSET(t->c_lflag, ICANON)) 886 SET(tp->t_lflag, PENDIN); 887 else { 888 /* 889 * XXX we really shouldn't allow toggling 890 * ICANON while we're in a non-termios line 891 * discipline. Now we have to worry about 892 * panicing for a null queue. 893 */ 894 if (tp->t_canq.c_cbreserved > 0 && 895 tp->t_rawq.c_cbreserved > 0) { 896 catq(&tp->t_rawq, &tp->t_canq); 897 /* 898 * XXX the queue limits may be 899 * different, so the old queue 900 * swapping method no longer works. 901 */ 902 catq(&tp->t_canq, &tp->t_rawq); 903 } 904 CLR(tp->t_lflag, PENDIN); 905 } 906 ttwakeup(tp); 907 } 908 tp->t_iflag = t->c_iflag; 909 tp->t_oflag = t->c_oflag; 910 /* 911 * Make the EXTPROC bit read only. 912 */ 913 if (ISSET(tp->t_lflag, EXTPROC)) 914 SET(t->c_lflag, EXTPROC); 915 else 916 CLR(t->c_lflag, EXTPROC); 917 tp->t_lflag = t->c_lflag | ISSET(tp->t_lflag, PENDIN); 918 if (t->c_cc[VMIN] != tp->t_cc[VMIN] || 919 t->c_cc[VTIME] != tp->t_cc[VTIME]) 920 ttwakeup(tp); 921 bcopy(t->c_cc, tp->t_cc, sizeof(t->c_cc)); 922 splx(s); 923 break; 924 } 925 case TIOCSETD: { /* set line discipline */ 926 register int t = *(int *)data; 927 dev_t device = tp->t_dev; 928 929 if ((u_int)t >= nlinesw) 930 return (ENXIO); 931 if (t != tp->t_line) { 932 s = spltty(); 933 (*linesw[tp->t_line].l_close)(tp, flag); 934 error = (*linesw[t].l_open)(device, tp); 935 if (error) { 936 (void)(*linesw[tp->t_line].l_open)(device, tp); 937 splx(s); 938 return (error); 939 } 940 tp->t_line = t; 941 splx(s); 942 } 943 break; 944 } 945 case TIOCSTART: /* start output, like ^Q */ 946 s = spltty(); 947 if (ISSET(tp->t_state, TS_TTSTOP) || 948 ISSET(tp->t_lflag, FLUSHO)) { 949 CLR(tp->t_lflag, FLUSHO); 950 CLR(tp->t_state, TS_TTSTOP); 951 ttstart(tp); 952 } 953 splx(s); 954 break; 955 case TIOCSTI: /* simulate terminal input */ 956 if (p->p_ucred->cr_uid && (flag & FREAD) == 0) 957 return (EPERM); 958 if (p->p_ucred->cr_uid && !isctty(p, tp)) 959 return (EACCES); 960 s = spltty(); 961 (*linesw[tp->t_line].l_rint)(*(u_char *)data, tp); 962 splx(s); 963 break; 964 case TIOCSTOP: /* stop output, like ^S */ 965 s = spltty(); 966 if (!ISSET(tp->t_state, TS_TTSTOP)) { 967 SET(tp->t_state, TS_TTSTOP); 968#ifdef sun4c /* XXX */ 969 (*tp->t_stop)(tp, 0); 970#else 971 (*cdevsw[major(tp->t_dev)]->d_stop)(tp, 0); 972#endif 973 } 974 splx(s); 975 break; 976 case TIOCSCTTY: /* become controlling tty */ 977 /* Session ctty vnode pointer set in vnode layer. */ 978 if (!SESS_LEADER(p) || 979 ((p->p_session->s_ttyvp || tp->t_session) && 980 (tp->t_session != p->p_session))) 981 return (EPERM); 982 tp->t_session = p->p_session; 983 tp->t_pgrp = p->p_pgrp; 984 p->p_session->s_ttyp = tp; 985 p->p_flag |= P_CONTROLT; 986 break; 987 case TIOCSPGRP: { /* set pgrp of tty */ 988 register struct pgrp *pgrp = pgfind(*(int *)data); 989 990 if (!isctty(p, tp)) 991 return (ENOTTY); 992 else if (pgrp == NULL || pgrp->pg_session != p->p_session) 993 return (EPERM); 994 tp->t_pgrp = pgrp; 995 break; 996 } 997 case TIOCSTAT: /* simulate control-T */ 998 s = spltty(); 999 ttyinfo(tp); 1000 splx(s); 1001 break; 1002 case TIOCSWINSZ: /* set window size */ 1003 if (bcmp((caddr_t)&tp->t_winsize, data, 1004 sizeof (struct winsize))) { 1005 tp->t_winsize = *(struct winsize *)data; 1006 pgsignal(tp->t_pgrp, SIGWINCH, 1); 1007 } 1008 break; 1009 case TIOCSDRAINWAIT: 1010 error = suser(p->p_ucred, &p->p_acflag); 1011 if (error) 1012 return (error); 1013 tp->t_timeout = *(int *)data * hz; 1014 wakeup(TSA_OCOMPLETE(tp)); 1015 wakeup(TSA_OLOWAT(tp)); 1016 break; 1017 case TIOCGDRAINWAIT: 1018 *(int *)data = tp->t_timeout / hz; 1019 break; 1020 default: 1021#if defined(COMPAT_43) || defined(COMPAT_SUNOS) 1022 return (ttcompat(tp, cmd, data, flag)); 1023#else 1024 return (-1); 1025#endif 1026 } 1027 return (0); 1028} 1029 1030int 1031ttyselect(tp, rw, p) 1032 struct tty *tp; 1033 int rw; 1034 struct proc *p; 1035{ 1036 int s; 1037 1038 if (tp == NULL) 1039 return (ENXIO); 1040 1041 s = spltty(); 1042 switch (rw) { 1043 case FREAD: 1044 if (ttnread(tp) > 0 || ISSET(tp->t_state, TS_ZOMBIE)) 1045 goto win; 1046 selrecord(p, &tp->t_rsel); 1047 break; 1048 case FWRITE: 1049 if ((tp->t_outq.c_cc <= tp->t_lowat && 1050 ISSET(tp->t_state, TS_CONNECTED)) 1051 || ISSET(tp->t_state, TS_ZOMBIE)) { 1052win: splx(s); 1053 return (1); 1054 } 1055 selrecord(p, &tp->t_wsel); 1056 break; 1057 } 1058 splx(s); 1059 return (0); 1060} 1061 1062/* 1063 * This is a wrapper for compatibility with the select vector used by 1064 * cdevsw. It relies on a proper xxxdevtotty routine. 1065 */ 1066int 1067ttselect(dev, rw, p) 1068 dev_t dev; 1069 int rw; 1070 struct proc *p; 1071{ 1072 return ttyselect((*cdevsw[major(dev)]->d_devtotty)(dev), rw, p); 1073} 1074 1075/* 1076 * Must be called at spltty(). 1077 */ 1078static int 1079ttnread(tp) 1080 struct tty *tp; 1081{ 1082 int nread; 1083 1084 if (ISSET(tp->t_lflag, PENDIN)) 1085 ttypend(tp); 1086 nread = tp->t_canq.c_cc; 1087 if (!ISSET(tp->t_lflag, ICANON)) { 1088 nread += tp->t_rawq.c_cc; 1089 if (nread < tp->t_cc[VMIN] && tp->t_cc[VTIME] == 0) 1090 nread = 0; 1091 } 1092 return (nread); 1093} 1094 1095/* 1096 * Wait for output to drain. 1097 */ 1098int 1099ttywait(tp) 1100 register struct tty *tp; 1101{ 1102 int error, s; 1103 1104 error = 0; 1105 s = spltty(); 1106 while ((tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY)) && 1107 ISSET(tp->t_state, TS_CONNECTED) && tp->t_oproc) { 1108 (*tp->t_oproc)(tp); 1109 if ((tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY)) && 1110 ISSET(tp->t_state, TS_CONNECTED)) { 1111 SET(tp->t_state, TS_SO_OCOMPLETE); 1112 error = ttysleep(tp, TSA_OCOMPLETE(tp), 1113 TTOPRI | PCATCH, "ttywai", 1114 tp->t_timeout); 1115 if (error) { 1116 if (error == EWOULDBLOCK) 1117 error = EIO; 1118 break; 1119 } 1120 } else 1121 break; 1122 } 1123 if (!error && (tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY))) 1124 error = EIO; 1125 splx(s); 1126 return (error); 1127} 1128 1129/* 1130 * Flush if successfully wait. 1131 */ 1132static int 1133ttywflush(tp) 1134 struct tty *tp; 1135{ 1136 int error; 1137 1138 if ((error = ttywait(tp)) == 0) 1139 ttyflush(tp, FREAD); 1140 return (error); 1141} 1142 1143/* 1144 * Flush tty read and/or write queues, notifying anyone waiting. 1145 */ 1146void 1147ttyflush(tp, rw) 1148 register struct tty *tp; 1149 int rw; 1150{ 1151 register int s; 1152 1153 s = spltty(); 1154again: 1155 if (rw & FWRITE) 1156 CLR(tp->t_state, TS_TTSTOP); 1157#ifdef sun4c /* XXX */ 1158 (*tp->t_stop)(tp, rw); 1159#else 1160 (*cdevsw[major(tp->t_dev)]->d_stop)(tp, rw); 1161#endif 1162 if (rw & FREAD) { 1163 FLUSHQ(&tp->t_canq); 1164 FLUSHQ(&tp->t_rawq); 1165 CLR(tp->t_lflag, PENDIN); 1166 tp->t_rocount = 0; 1167 tp->t_rocol = 0; 1168 CLR(tp->t_state, TS_LOCAL); 1169 ttwakeup(tp); 1170 if (ISSET(tp->t_state, TS_TBLOCK)) { 1171 if (rw & FWRITE) 1172 FLUSHQ(&tp->t_outq); 1173 ttyunblock(tp); 1174 1175 /* 1176 * Don't let leave any state that might clobber the 1177 * next line discipline (although we should do more 1178 * to send the START char). Not clearing the state 1179 * may have caused the "putc to a clist with no 1180 * reserved cblocks" panic/printf. 1181 */ 1182 CLR(tp->t_state, TS_TBLOCK); 1183 1184#if 0 /* forget it, sleeping isn't always safe and we don't know when it is */ 1185 if (ISSET(tp->t_iflag, IXOFF)) { 1186 /* 1187 * XXX wait a bit in the hope that the stop 1188 * character (if any) will go out. Waiting 1189 * isn't good since it allows races. This 1190 * will be fixed when the stop character is 1191 * put in a special queue. Don't bother with 1192 * the checks in ttywait() since the timeout 1193 * will save us. 1194 */ 1195 SET(tp->t_state, TS_SO_OCOMPLETE); 1196 ttysleep(tp, TSA_OCOMPLETE(tp), TTOPRI, 1197 "ttyfls", hz / 10); 1198 /* 1199 * Don't try sending the stop character again. 1200 */ 1201 CLR(tp->t_state, TS_TBLOCK); 1202 goto again; 1203 } 1204#endif 1205 } 1206 } 1207 if (rw & FWRITE) { 1208 FLUSHQ(&tp->t_outq); 1209 ttwwakeup(tp); 1210 } 1211 splx(s); 1212} 1213 1214/* 1215 * Copy in the default termios characters. 1216 */ 1217void 1218termioschars(t) 1219 struct termios *t; 1220{ 1221 1222 bcopy(ttydefchars, t->c_cc, sizeof t->c_cc); 1223} 1224 1225/* 1226 * Old interface. 1227 */ 1228void 1229ttychars(tp) 1230 struct tty *tp; 1231{ 1232 1233 termioschars(&tp->t_termios); 1234} 1235 1236/* 1237 * Handle input high water. Send stop character for the IXOFF case. Turn 1238 * on our input flow control bit and propagate the changes to the driver. 1239 * XXX the stop character should be put in a special high priority queue. 1240 */ 1241void 1242ttyblock(tp) 1243 struct tty *tp; 1244{ 1245 1246 SET(tp->t_state, TS_TBLOCK); 1247 if (ISSET(tp->t_iflag, IXOFF) && tp->t_cc[VSTOP] != _POSIX_VDISABLE && 1248 putc(tp->t_cc[VSTOP], &tp->t_outq) != 0) 1249 CLR(tp->t_state, TS_TBLOCK); /* try again later */ 1250 ttstart(tp); 1251} 1252 1253/* 1254 * Handle input low water. Send start character for the IXOFF case. Turn 1255 * off our input flow control bit and propagate the changes to the driver. 1256 * XXX the start character should be put in a special high priority queue. 1257 */ 1258static void 1259ttyunblock(tp) 1260 struct tty *tp; 1261{ 1262 1263 CLR(tp->t_state, TS_TBLOCK); 1264 if (ISSET(tp->t_iflag, IXOFF) && tp->t_cc[VSTART] != _POSIX_VDISABLE && 1265 putc(tp->t_cc[VSTART], &tp->t_outq) != 0) 1266 SET(tp->t_state, TS_TBLOCK); /* try again later */ 1267 ttstart(tp); 1268} 1269 1270#ifdef notyet 1271/* Not used by any current (i386) drivers. */ 1272/* 1273 * Restart after an inter-char delay. 1274 */ 1275void 1276ttrstrt(tp_arg) 1277 void *tp_arg; 1278{ 1279 struct tty *tp; 1280 int s; 1281 1282#ifdef DIAGNOSTIC 1283 if (tp_arg == NULL) 1284 panic("ttrstrt"); 1285#endif 1286 tp = tp_arg; 1287 s = spltty(); 1288 1289 CLR(tp->t_state, TS_TIMEOUT); 1290 ttstart(tp); 1291 1292 splx(s); 1293} 1294#endif 1295 1296int 1297ttstart(tp) 1298 struct tty *tp; 1299{ 1300 1301 if (tp->t_oproc != NULL) /* XXX: Kludge for pty. */ 1302 (*tp->t_oproc)(tp); 1303 return (0); 1304} 1305 1306/* 1307 * "close" a line discipline 1308 */ 1309int 1310ttylclose(tp, flag) 1311 struct tty *tp; 1312 int flag; 1313{ 1314 1315 if (flag & FNONBLOCK || ttywflush(tp)) 1316 ttyflush(tp, FREAD | FWRITE); 1317 return (0); 1318} 1319 1320/* 1321 * Handle modem control transition on a tty. 1322 * Flag indicates new state of carrier. 1323 * Returns 0 if the line should be turned off, otherwise 1. 1324 */ 1325int 1326ttymodem(tp, flag) 1327 register struct tty *tp; 1328 int flag; 1329{ 1330 1331 if (ISSET(tp->t_state, TS_CARR_ON) && ISSET(tp->t_cflag, MDMBUF)) { 1332 /* 1333 * MDMBUF: do flow control according to carrier flag 1334 * XXX TS_CAR_OFLOW doesn't do anything yet. TS_TTSTOP 1335 * works if IXON and IXANY are clear. 1336 */ 1337 if (flag) { 1338 CLR(tp->t_state, TS_CAR_OFLOW); 1339 CLR(tp->t_state, TS_TTSTOP); 1340 ttstart(tp); 1341 } else if (!ISSET(tp->t_state, TS_CAR_OFLOW)) { 1342 SET(tp->t_state, TS_CAR_OFLOW); 1343 SET(tp->t_state, TS_TTSTOP); 1344#ifdef sun4c /* XXX */ 1345 (*tp->t_stop)(tp, 0); 1346#else 1347 (*cdevsw[major(tp->t_dev)]->d_stop)(tp, 0); 1348#endif 1349 } 1350 } else if (flag == 0) { 1351 /* 1352 * Lost carrier. 1353 */ 1354 CLR(tp->t_state, TS_CARR_ON); 1355 if (ISSET(tp->t_state, TS_ISOPEN) && 1356 !ISSET(tp->t_cflag, CLOCAL)) { 1357 SET(tp->t_state, TS_ZOMBIE); 1358 CLR(tp->t_state, TS_CONNECTED); 1359 if (tp->t_session && tp->t_session->s_leader) 1360 psignal(tp->t_session->s_leader, SIGHUP); 1361 ttyflush(tp, FREAD | FWRITE); 1362 return (0); 1363 } 1364 } else { 1365 /* 1366 * Carrier now on. 1367 */ 1368 SET(tp->t_state, TS_CARR_ON); 1369 if (!ISSET(tp->t_state, TS_ZOMBIE)) 1370 SET(tp->t_state, TS_CONNECTED); 1371 wakeup(TSA_CARR_ON(tp)); 1372 ttwakeup(tp); 1373 ttwwakeup(tp); 1374 } 1375 return (1); 1376} 1377 1378/* 1379 * Reinput pending characters after state switch 1380 * call at spltty(). 1381 */ 1382static void 1383ttypend(tp) 1384 register struct tty *tp; 1385{ 1386 struct clist tq; 1387 register int c; 1388 1389 CLR(tp->t_lflag, PENDIN); 1390 SET(tp->t_state, TS_TYPEN); 1391 /* 1392 * XXX this assumes too much about clist internals. It may even 1393 * fail if the cblock slush pool is empty. We can't allocate more 1394 * cblocks here because we are called from an interrupt handler 1395 * and clist_alloc_cblocks() can wait. 1396 */ 1397 tq = tp->t_rawq; 1398 bzero(&tp->t_rawq, sizeof tp->t_rawq); 1399 tp->t_rawq.c_cbmax = tq.c_cbmax; 1400 tp->t_rawq.c_cbreserved = tq.c_cbreserved; 1401 while ((c = getc(&tq)) >= 0) 1402 ttyinput(c, tp); 1403 CLR(tp->t_state, TS_TYPEN); 1404} 1405 1406/* 1407 * Process a read call on a tty device. 1408 */ 1409int 1410ttread(tp, uio, flag) 1411 register struct tty *tp; 1412 struct uio *uio; 1413 int flag; 1414{ 1415 register struct clist *qp; 1416 register int c; 1417 register tcflag_t lflag; 1418 register cc_t *cc = tp->t_cc; 1419 register struct proc *p = curproc; 1420 int s, first, error = 0; 1421 int has_stime = 0, last_cc = 0; 1422 long slp = 0; /* XXX this should be renamed `timo'. */ 1423 1424loop: 1425 s = spltty(); 1426 lflag = tp->t_lflag; 1427 /* 1428 * take pending input first 1429 */ 1430 if (ISSET(lflag, PENDIN)) { 1431 ttypend(tp); 1432 splx(s); /* reduce latency */ 1433 s = spltty(); 1434 lflag = tp->t_lflag; /* XXX ttypend() clobbers it */ 1435 } 1436 1437 /* 1438 * Hang process if it's in the background. 1439 */ 1440 if (isbackground(p, tp)) { 1441 splx(s); 1442 if ((p->p_sigignore & sigmask(SIGTTIN)) || 1443 (p->p_sigmask & sigmask(SIGTTIN)) || 1444 p->p_flag & P_PPWAIT || p->p_pgrp->pg_jobc == 0) 1445 return (EIO); 1446 pgsignal(p->p_pgrp, SIGTTIN, 1); 1447 error = ttysleep(tp, &lbolt, TTIPRI | PCATCH, "ttybg2", 0); 1448 if (error) 1449 return (error); 1450 goto loop; 1451 } 1452 1453 if (ISSET(tp->t_state, TS_ZOMBIE)) { 1454 splx(s); 1455 return (0); /* EOF */ 1456 } 1457 1458 /* 1459 * If canonical, use the canonical queue, 1460 * else use the raw queue. 1461 * 1462 * (should get rid of clists...) 1463 */ 1464 qp = ISSET(lflag, ICANON) ? &tp->t_canq : &tp->t_rawq; 1465 1466 if (flag & IO_NDELAY) { 1467 if (qp->c_cc > 0) 1468 goto read; 1469 if (!ISSET(lflag, ICANON) && cc[VMIN] == 0) { 1470 splx(s); 1471 return (0); 1472 } 1473 splx(s); 1474 return (EWOULDBLOCK); 1475 } 1476 if (!ISSET(lflag, ICANON)) { 1477 int m = cc[VMIN]; 1478 long t = cc[VTIME]; 1479 struct timeval stime, timecopy; 1480 int x; 1481 1482 /* 1483 * Check each of the four combinations. 1484 * (m > 0 && t == 0) is the normal read case. 1485 * It should be fairly efficient, so we check that and its 1486 * companion case (m == 0 && t == 0) first. 1487 * For the other two cases, we compute the target sleep time 1488 * into slp. 1489 */ 1490 if (t == 0) { 1491 if (qp->c_cc < m) 1492 goto sleep; 1493 if (qp->c_cc > 0) 1494 goto read; 1495 1496 /* m, t and qp->c_cc are all 0. 0 is enough input. */ 1497 splx(s); 1498 return (0); 1499 } 1500 t *= 100000; /* time in us */ 1501#define diff(t1, t2) (((t1).tv_sec - (t2).tv_sec) * 1000000 + \ 1502 ((t1).tv_usec - (t2).tv_usec)) 1503 if (m > 0) { 1504 if (qp->c_cc <= 0) 1505 goto sleep; 1506 if (qp->c_cc >= m) 1507 goto read; 1508 x = splclock(); 1509 timecopy = time; 1510 splx(x); 1511 if (!has_stime) { 1512 /* first character, start timer */ 1513 has_stime = 1; 1514 stime = timecopy; 1515 slp = t; 1516 } else if (qp->c_cc > last_cc) { 1517 /* got a character, restart timer */ 1518 stime = timecopy; 1519 slp = t; 1520 } else { 1521 /* nothing, check expiration */ 1522 slp = t - diff(timecopy, stime); 1523 if (slp <= 0) 1524 goto read; 1525 } 1526 last_cc = qp->c_cc; 1527 } else { /* m == 0 */ 1528 if (qp->c_cc > 0) 1529 goto read; 1530 x = splclock(); 1531 timecopy = time; 1532 splx(x); 1533 if (!has_stime) { 1534 has_stime = 1; 1535 stime = timecopy; 1536 slp = t; 1537 } else { 1538 slp = t - diff(timecopy, stime); 1539 if (slp <= 0) { 1540 /* Timed out, but 0 is enough input. */ 1541 splx(s); 1542 return (0); 1543 } 1544 } 1545 } 1546#undef diff 1547 /* 1548 * Rounding down may make us wake up just short 1549 * of the target, so we round up. 1550 * The formula is ceiling(slp * hz/1000000). 1551 * 32-bit arithmetic is enough for hz < 169. 1552 * XXX see hzto() for how to avoid overflow if hz 1553 * is large (divide by `tick' and/or arrange to 1554 * use hzto() if hz is large). 1555 */ 1556 slp = (long) (((u_long)slp * hz) + 999999) / 1000000; 1557 goto sleep; 1558 } 1559 if (qp->c_cc <= 0) { 1560sleep: 1561 /* 1562 * There is no input, or not enough input and we can block. 1563 */ 1564 error = ttysleep(tp, TSA_HUP_OR_INPUT(tp), TTIPRI | PCATCH, 1565 ISSET(tp->t_state, TS_CONNECTED) ? 1566 "ttyin" : "ttyhup", (int)slp); 1567 splx(s); 1568 if (error == EWOULDBLOCK) 1569 error = 0; 1570 else if (error) 1571 return (error); 1572 /* 1573 * XXX what happens if another process eats some input 1574 * while we are asleep (not just here)? It would be 1575 * safest to detect changes and reset our state variables 1576 * (has_stime and last_cc). 1577 */ 1578 slp = 0; 1579 goto loop; 1580 } 1581read: 1582 splx(s); 1583 /* 1584 * Input present, check for input mapping and processing. 1585 */ 1586 first = 1; 1587 if (ISSET(lflag, ICANON | ISIG)) 1588 goto slowcase; 1589 for (;;) { 1590 char ibuf[IBUFSIZ]; 1591 int icc; 1592 1593 icc = imin(uio->uio_resid, IBUFSIZ); 1594 icc = q_to_b(qp, ibuf, icc); 1595 if (icc <= 0) { 1596 if (first) 1597 goto loop; 1598 break; 1599 } 1600 error = uiomove(ibuf, icc, uio); 1601 /* 1602 * XXX if there was an error then we should ungetc() the 1603 * unmoved chars and reduce icc here. 1604 */ 1605#if NSNP > 0 1606 if (ISSET(tp->t_lflag, ECHO) && 1607 ISSET(tp->t_state, TS_SNOOP) && tp->t_sc != NULL) 1608 snpin((struct snoop *)tp->t_sc, ibuf, icc); 1609#endif 1610 if (error) 1611 break; 1612 if (uio->uio_resid == 0) 1613 break; 1614 first = 0; 1615 } 1616 goto out; 1617slowcase: 1618 for (;;) { 1619 c = getc(qp); 1620 if (c < 0) { 1621 if (first) 1622 goto loop; 1623 break; 1624 } 1625 /* 1626 * delayed suspend (^Y) 1627 */ 1628 if (CCEQ(cc[VDSUSP], c) && ISSET(lflag, ISIG)) { 1629 pgsignal(tp->t_pgrp, SIGTSTP, 1); 1630 if (first) { 1631 error = ttysleep(tp, &lbolt, TTIPRI | PCATCH, 1632 "ttybg3", 0); 1633 if (error) 1634 break; 1635 goto loop; 1636 } 1637 break; 1638 } 1639 /* 1640 * Interpret EOF only in canonical mode. 1641 */ 1642 if (CCEQ(cc[VEOF], c) && ISSET(lflag, ICANON)) 1643 break; 1644 /* 1645 * Give user character. 1646 */ 1647 error = ureadc(c, uio); 1648 if (error) 1649 /* XXX should ungetc(c, qp). */ 1650 break; 1651#if NSNP > 0 1652 /* 1653 * Only snoop directly on input in echo mode. Non-echoed 1654 * input will be snooped later iff the application echoes it. 1655 */ 1656 if (ISSET(tp->t_lflag, ECHO) && 1657 ISSET(tp->t_state, TS_SNOOP) && tp->t_sc != NULL) 1658 snpinc((struct snoop *)tp->t_sc, (char)c); 1659#endif 1660 if (uio->uio_resid == 0) 1661 break; 1662 /* 1663 * In canonical mode check for a "break character" 1664 * marking the end of a "line of input". 1665 */ 1666 if (ISSET(lflag, ICANON) && TTBREAKC(c)) 1667 break; 1668 first = 0; 1669 } 1670 1671out: 1672 /* 1673 * Look to unblock input now that (presumably) 1674 * the input queue has gone down. 1675 */ 1676 s = spltty(); 1677 if (ISSET(tp->t_state, TS_TBLOCK) && 1678 tp->t_rawq.c_cc + tp->t_canq.c_cc <= I_LOW_WATER) 1679 ttyunblock(tp); 1680 splx(s); 1681 1682 return (error); 1683} 1684 1685/* 1686 * Check the output queue on tp for space for a kernel message (from uprintf 1687 * or tprintf). Allow some space over the normal hiwater mark so we don't 1688 * lose messages due to normal flow control, but don't let the tty run amok. 1689 * Sleeps here are not interruptible, but we return prematurely if new signals 1690 * arrive. 1691 */ 1692int 1693ttycheckoutq(tp, wait) 1694 register struct tty *tp; 1695 int wait; 1696{ 1697 int hiwat, s, oldsig; 1698 1699 hiwat = tp->t_hiwat; 1700 s = spltty(); 1701 oldsig = wait ? curproc->p_siglist : 0; 1702 if (tp->t_outq.c_cc > hiwat + OBUFSIZ + 100) 1703 while (tp->t_outq.c_cc > hiwat) { 1704 ttstart(tp); 1705 if (tp->t_outq.c_cc <= hiwat) 1706 break; 1707 if (wait == 0 || curproc->p_siglist != oldsig) { 1708 splx(s); 1709 return (0); 1710 } 1711 SET(tp->t_state, TS_SO_OLOWAT); 1712 tsleep(TSA_OLOWAT(tp), PZERO - 1, "ttoutq", hz); 1713 } 1714 splx(s); 1715 return (1); 1716} 1717 1718/* 1719 * Process a write call on a tty device. 1720 */ 1721int 1722ttwrite(tp, uio, flag) 1723 register struct tty *tp; 1724 register struct uio *uio; 1725 int flag; 1726{ 1727 register char *cp = NULL; 1728 register int cc, ce; 1729 register struct proc *p; 1730 int i, hiwat, cnt, error, s; 1731 char obuf[OBUFSIZ]; 1732 1733 hiwat = tp->t_hiwat; 1734 cnt = uio->uio_resid; 1735 error = 0; 1736 cc = 0; 1737loop: 1738 s = spltty(); 1739 if (ISSET(tp->t_state, TS_ZOMBIE)) { 1740 splx(s); 1741 if (uio->uio_resid == cnt) 1742 error = EIO; 1743 goto out; 1744 } 1745 if (!ISSET(tp->t_state, TS_CONNECTED)) { 1746 if (flag & IO_NDELAY) { 1747 splx(s); 1748 error = EWOULDBLOCK; 1749 goto out; 1750 } 1751 error = ttysleep(tp, TSA_CARR_ON(tp), TTIPRI | PCATCH, 1752 "ttydcd", 0); 1753 splx(s); 1754 if (error) 1755 goto out; 1756 goto loop; 1757 } 1758 splx(s); 1759 /* 1760 * Hang the process if it's in the background. 1761 */ 1762 p = curproc; 1763 if (isbackground(p, tp) && 1764 ISSET(tp->t_lflag, TOSTOP) && (p->p_flag & P_PPWAIT) == 0 && 1765 (p->p_sigignore & sigmask(SIGTTOU)) == 0 && 1766 (p->p_sigmask & sigmask(SIGTTOU)) == 0 && 1767 p->p_pgrp->pg_jobc) { 1768 pgsignal(p->p_pgrp, SIGTTOU, 1); 1769 error = ttysleep(tp, &lbolt, TTIPRI | PCATCH, "ttybg4", 0); 1770 if (error) 1771 goto out; 1772 goto loop; 1773 } 1774 /* 1775 * Process the user's data in at most OBUFSIZ chunks. Perform any 1776 * output translation. Keep track of high water mark, sleep on 1777 * overflow awaiting device aid in acquiring new space. 1778 */ 1779 while (uio->uio_resid > 0 || cc > 0) { 1780 if (ISSET(tp->t_lflag, FLUSHO)) { 1781 uio->uio_resid = 0; 1782 return (0); 1783 } 1784 if (tp->t_outq.c_cc > hiwat) 1785 goto ovhiwat; 1786 /* 1787 * Grab a hunk of data from the user, unless we have some 1788 * leftover from last time. 1789 */ 1790 if (cc == 0) { 1791 cc = imin(uio->uio_resid, OBUFSIZ); 1792 cp = obuf; 1793 error = uiomove(cp, cc, uio); 1794 if (error) { 1795 cc = 0; 1796 break; 1797 } 1798#if NSNP > 0 1799 if (ISSET(tp->t_state, TS_SNOOP) && tp->t_sc != NULL) 1800 snpin((struct snoop *)tp->t_sc, cp, cc); 1801#endif 1802 } 1803 /* 1804 * If nothing fancy need be done, grab those characters we 1805 * can handle without any of ttyoutput's processing and 1806 * just transfer them to the output q. For those chars 1807 * which require special processing (as indicated by the 1808 * bits in char_type), call ttyoutput. After processing 1809 * a hunk of data, look for FLUSHO so ^O's will take effect 1810 * immediately. 1811 */ 1812 while (cc > 0) { 1813 if (!ISSET(tp->t_oflag, OPOST)) 1814 ce = cc; 1815 else { 1816 ce = cc - scanc((u_int)cc, (u_char *)cp, 1817 (u_char *)char_type, CCLASSMASK); 1818 /* 1819 * If ce is zero, then we're processing 1820 * a special character through ttyoutput. 1821 */ 1822 if (ce == 0) { 1823 tp->t_rocount = 0; 1824 if (ttyoutput(*cp, tp) >= 0) { 1825 /* No Clists, wait a bit. */ 1826 ttstart(tp); 1827 if (flag & IO_NDELAY) { 1828 error = EWOULDBLOCK; 1829 goto out; 1830 } 1831 error = ttysleep(tp, &lbolt, 1832 TTOPRI|PCATCH, 1833 "ttybf1", 0); 1834 if (error) 1835 goto out; 1836 goto loop; 1837 } 1838 cp++; 1839 cc--; 1840 if (ISSET(tp->t_lflag, FLUSHO) || 1841 tp->t_outq.c_cc > hiwat) 1842 goto ovhiwat; 1843 continue; 1844 } 1845 } 1846 /* 1847 * A bunch of normal characters have been found. 1848 * Transfer them en masse to the output queue and 1849 * continue processing at the top of the loop. 1850 * If there are any further characters in this 1851 * <= OBUFSIZ chunk, the first should be a character 1852 * requiring special handling by ttyoutput. 1853 */ 1854 tp->t_rocount = 0; 1855 i = b_to_q(cp, ce, &tp->t_outq); 1856 ce -= i; 1857 tp->t_column += ce; 1858 cp += ce, cc -= ce, tk_nout += ce; 1859 tp->t_outcc += ce; 1860 if (i > 0) { 1861 /* No Clists, wait a bit. */ 1862 ttstart(tp); 1863 if (flag & IO_NDELAY) { 1864 error = EWOULDBLOCK; 1865 goto out; 1866 } 1867 error = ttysleep(tp, &lbolt, TTOPRI | PCATCH, 1868 "ttybf2", 0); 1869 if (error) 1870 goto out; 1871 goto loop; 1872 } 1873 if (ISSET(tp->t_lflag, FLUSHO) || 1874 tp->t_outq.c_cc > hiwat) 1875 break; 1876 } 1877 ttstart(tp); 1878 } 1879out: 1880 /* 1881 * If cc is nonzero, we leave the uio structure inconsistent, as the 1882 * offset and iov pointers have moved forward, but it doesn't matter 1883 * (the call will either return short or restart with a new uio). 1884 */ 1885 uio->uio_resid += cc; 1886 return (error); 1887 1888ovhiwat: 1889 ttstart(tp); 1890 s = spltty(); 1891 /* 1892 * This can only occur if FLUSHO is set in t_lflag, 1893 * or if ttstart/oproc is synchronous (or very fast). 1894 */ 1895 if (tp->t_outq.c_cc <= hiwat) { 1896 splx(s); 1897 goto loop; 1898 } 1899 if (flag & IO_NDELAY) { 1900 splx(s); 1901 uio->uio_resid += cc; 1902 return (uio->uio_resid == cnt ? EWOULDBLOCK : 0); 1903 } 1904 SET(tp->t_state, TS_SO_OLOWAT); 1905 error = ttysleep(tp, TSA_OLOWAT(tp), TTOPRI | PCATCH, "ttywri", 1906 tp->t_timeout); 1907 splx(s); 1908 if (error == EWOULDBLOCK) 1909 error = EIO; 1910 if (error) 1911 goto out; 1912 goto loop; 1913} 1914 1915/* 1916 * Rubout one character from the rawq of tp 1917 * as cleanly as possible. 1918 */ 1919static void 1920ttyrub(c, tp) 1921 register int c; 1922 register struct tty *tp; 1923{ 1924 register char *cp; 1925 register int savecol; 1926 int tabc, s; 1927 1928 if (!ISSET(tp->t_lflag, ECHO) || ISSET(tp->t_lflag, EXTPROC)) 1929 return; 1930 CLR(tp->t_lflag, FLUSHO); 1931 if (ISSET(tp->t_lflag, ECHOE)) { 1932 if (tp->t_rocount == 0) { 1933 /* 1934 * Screwed by ttwrite; retype 1935 */ 1936 ttyretype(tp); 1937 return; 1938 } 1939 if (c == ('\t' | TTY_QUOTE) || c == ('\n' | TTY_QUOTE)) 1940 ttyrubo(tp, 2); 1941 else { 1942 CLR(c, ~TTY_CHARMASK); 1943 switch (CCLASS(c)) { 1944 case ORDINARY: 1945 ttyrubo(tp, 1); 1946 break; 1947 case BACKSPACE: 1948 case CONTROL: 1949 case NEWLINE: 1950 case RETURN: 1951 case VTAB: 1952 if (ISSET(tp->t_lflag, ECHOCTL)) 1953 ttyrubo(tp, 2); 1954 break; 1955 case TAB: 1956 if (tp->t_rocount < tp->t_rawq.c_cc) { 1957 ttyretype(tp); 1958 return; 1959 } 1960 s = spltty(); 1961 savecol = tp->t_column; 1962 SET(tp->t_state, TS_CNTTB); 1963 SET(tp->t_lflag, FLUSHO); 1964 tp->t_column = tp->t_rocol; 1965 cp = tp->t_rawq.c_cf; 1966 if (cp) 1967 tabc = *cp; /* XXX FIX NEXTC */ 1968 for (; cp; cp = nextc(&tp->t_rawq, cp, &tabc)) 1969 ttyecho(tabc, tp); 1970 CLR(tp->t_lflag, FLUSHO); 1971 CLR(tp->t_state, TS_CNTTB); 1972 splx(s); 1973 1974 /* savecol will now be length of the tab. */ 1975 savecol -= tp->t_column; 1976 tp->t_column += savecol; 1977 if (savecol > 8) 1978 savecol = 8; /* overflow screw */ 1979 while (--savecol >= 0) 1980 (void)ttyoutput('\b', tp); 1981 break; 1982 default: /* XXX */ 1983#define PANICSTR "ttyrub: would panic c = %d, val = %d\n" 1984 (void)printf(PANICSTR, c, CCLASS(c)); 1985#ifdef notdef 1986 panic(PANICSTR, c, CCLASS(c)); 1987#endif 1988 } 1989 } 1990 } else if (ISSET(tp->t_lflag, ECHOPRT)) { 1991 if (!ISSET(tp->t_state, TS_ERASE)) { 1992 SET(tp->t_state, TS_ERASE); 1993 (void)ttyoutput('\\', tp); 1994 } 1995 ttyecho(c, tp); 1996 } else 1997 ttyecho(tp->t_cc[VERASE], tp); 1998 --tp->t_rocount; 1999} 2000 2001/* 2002 * Back over cnt characters, erasing them. 2003 */ 2004static void 2005ttyrubo(tp, cnt) 2006 register struct tty *tp; 2007 int cnt; 2008{ 2009 2010 while (cnt-- > 0) { 2011 (void)ttyoutput('\b', tp); 2012 (void)ttyoutput(' ', tp); 2013 (void)ttyoutput('\b', tp); 2014 } 2015} 2016 2017/* 2018 * ttyretype -- 2019 * Reprint the rawq line. Note, it is assumed that c_cc has already 2020 * been checked. 2021 */ 2022static void 2023ttyretype(tp) 2024 register struct tty *tp; 2025{ 2026 register char *cp; 2027 int s, c; 2028 2029 /* Echo the reprint character. */ 2030 if (tp->t_cc[VREPRINT] != _POSIX_VDISABLE) 2031 ttyecho(tp->t_cc[VREPRINT], tp); 2032 2033 (void)ttyoutput('\n', tp); 2034 2035 /* 2036 * XXX 2037 * FIX: NEXTC IS BROKEN - DOESN'T CHECK QUOTE 2038 * BIT OF FIRST CHAR. 2039 */ 2040 s = spltty(); 2041 for (cp = tp->t_canq.c_cf, c = (cp != NULL ? *cp : 0); 2042 cp != NULL; cp = nextc(&tp->t_canq, cp, &c)) 2043 ttyecho(c, tp); 2044 for (cp = tp->t_rawq.c_cf, c = (cp != NULL ? *cp : 0); 2045 cp != NULL; cp = nextc(&tp->t_rawq, cp, &c)) 2046 ttyecho(c, tp); 2047 CLR(tp->t_state, TS_ERASE); 2048 splx(s); 2049 2050 tp->t_rocount = tp->t_rawq.c_cc; 2051 tp->t_rocol = 0; 2052} 2053 2054/* 2055 * Echo a typed character to the terminal. 2056 */ 2057static void 2058ttyecho(c, tp) 2059 register int c; 2060 register struct tty *tp; 2061{ 2062 2063 if (!ISSET(tp->t_state, TS_CNTTB)) 2064 CLR(tp->t_lflag, FLUSHO); 2065 if ((!ISSET(tp->t_lflag, ECHO) && 2066 (c != '\n' || !ISSET(tp->t_lflag, ECHONL))) || 2067 ISSET(tp->t_lflag, EXTPROC)) 2068 return; 2069 if (ISSET(tp->t_lflag, ECHOCTL) && 2070 ((ISSET(c, TTY_CHARMASK) <= 037 && c != '\t' && c != '\n') || 2071 ISSET(c, TTY_CHARMASK) == 0177)) { 2072 (void)ttyoutput('^', tp); 2073 CLR(c, ~TTY_CHARMASK); 2074 if (c == 0177) 2075 c = '?'; 2076 else 2077 c += 'A' - 1; 2078 } 2079 (void)ttyoutput(c, tp); 2080} 2081 2082/* 2083 * Wake up any readers on a tty. 2084 */ 2085void 2086ttwakeup(tp) 2087 register struct tty *tp; 2088{ 2089 2090 if (tp->t_rsel.si_pid != 0) 2091 selwakeup(&tp->t_rsel); 2092 if (ISSET(tp->t_state, TS_ASYNC)) 2093 pgsignal(tp->t_pgrp, SIGIO, 1); 2094 wakeup(TSA_HUP_OR_INPUT(tp)); 2095} 2096 2097/* 2098 * Wake up any writers on a tty. 2099 */ 2100void 2101ttwwakeup(tp) 2102 register struct tty *tp; 2103{ 2104 2105 if (tp->t_wsel.si_pid != 0 && tp->t_outq.c_cc <= tp->t_lowat) 2106 selwakeup(&tp->t_wsel); 2107 if (ISSET(tp->t_state, TS_BUSY | TS_SO_OCOMPLETE) == 2108 TS_SO_OCOMPLETE && tp->t_outq.c_cc == 0) { 2109 CLR(tp->t_state, TS_SO_OCOMPLETE); 2110 wakeup(TSA_OCOMPLETE(tp)); 2111 } 2112 if (ISSET(tp->t_state, TS_SO_OLOWAT) && 2113 tp->t_outq.c_cc <= tp->t_lowat) { 2114 CLR(tp->t_state, TS_SO_OLOWAT); 2115 wakeup(TSA_OLOWAT(tp)); 2116 } 2117} 2118 2119/* 2120 * Look up a code for a specified speed in a conversion table; 2121 * used by drivers to map software speed values to hardware parameters. 2122 */ 2123int 2124ttspeedtab(speed, table) 2125 int speed; 2126 register struct speedtab *table; 2127{ 2128 2129 for ( ; table->sp_speed != -1; table++) 2130 if (table->sp_speed == speed) 2131 return (table->sp_code); 2132 return (-1); 2133} 2134 2135/* 2136 * Set tty hi and low water marks. 2137 * 2138 * Try to arrange the dynamics so there's about one second 2139 * from hi to low water. 2140 * 2141 */ 2142void 2143ttsetwater(tp) 2144 struct tty *tp; 2145{ 2146 register int cps, x; 2147 2148#define CLAMP(x, h, l) ((x) > h ? h : ((x) < l) ? l : (x)) 2149 2150 cps = tp->t_ospeed / 10; 2151 tp->t_lowat = x = CLAMP(cps / 2, TTMAXLOWAT, TTMINLOWAT); 2152 x += cps; 2153 x = CLAMP(x, TTMAXHIWAT, TTMINHIWAT); 2154 tp->t_hiwat = roundup(x, CBSIZE); 2155#undef CLAMP 2156} 2157 2158/* 2159 * Report on state of foreground process group. 2160 */ 2161void 2162ttyinfo(tp) 2163 register struct tty *tp; 2164{ 2165 register struct proc *p, *pick; 2166 struct timeval utime, stime; 2167 int tmp; 2168 2169 if (ttycheckoutq(tp,0) == 0) 2170 return; 2171 2172 /* Print load average. */ 2173 tmp = (averunnable.ldavg[0] * 100 + FSCALE / 2) >> FSHIFT; 2174 ttyprintf(tp, "load: %d.%02d ", tmp / 100, tmp % 100); 2175 2176 if (tp->t_session == NULL) 2177 ttyprintf(tp, "not a controlling terminal\n"); 2178 else if (tp->t_pgrp == NULL) 2179 ttyprintf(tp, "no foreground process group\n"); 2180 else if ((p = tp->t_pgrp->pg_members.lh_first) == 0) 2181 ttyprintf(tp, "empty foreground process group\n"); 2182 else { 2183 /* Pick interesting process. */ 2184 for (pick = NULL; p != 0; p = p->p_pglist.le_next) 2185 if (proc_compare(pick, p)) 2186 pick = p; 2187 2188 ttyprintf(tp, " cmd: %s %d [%s] ", pick->p_comm, pick->p_pid, 2189 pick->p_stat == SRUN ? "running" : 2190 pick->p_wmesg ? pick->p_wmesg : "iowait"); 2191 2192 calcru(pick, &utime, &stime, NULL); 2193 2194 /* Print user time. */ 2195 ttyprintf(tp, "%d.%02du ", 2196 utime.tv_sec, utime.tv_usec / 10000); 2197 2198 /* Print system time. */ 2199 ttyprintf(tp, "%d.%02ds ", 2200 stime.tv_sec, stime.tv_usec / 10000); 2201 2202#define pgtok(a) (((a) * PAGE_SIZE) / 1024) 2203 /* Print percentage cpu, resident set size. */ 2204 tmp = (pick->p_pctcpu * 10000 + FSCALE / 2) >> FSHIFT; 2205 ttyprintf(tp, "%d%% %dk\n", 2206 tmp / 100, 2207 pick->p_stat == SIDL || pick->p_stat == SZOMB ? 0 : 2208#ifdef pmap_resident_count 2209 pgtok(pmap_resident_count(&pick->p_vmspace->vm_pmap)) 2210#else 2211 pgtok(pick->p_vmspace->vm_rssize) 2212#endif 2213 ); 2214 } 2215 tp->t_rocount = 0; /* so pending input will be retyped if BS */ 2216} 2217 2218/* 2219 * Returns 1 if p2 is "better" than p1 2220 * 2221 * The algorithm for picking the "interesting" process is thus: 2222 * 2223 * 1) Only foreground processes are eligible - implied. 2224 * 2) Runnable processes are favored over anything else. The runner 2225 * with the highest cpu utilization is picked (p_estcpu). Ties are 2226 * broken by picking the highest pid. 2227 * 3) The sleeper with the shortest sleep time is next. With ties, 2228 * we pick out just "short-term" sleepers (P_SINTR == 0). 2229 * 4) Further ties are broken by picking the highest pid. 2230 */ 2231#define ISRUN(p) (((p)->p_stat == SRUN) || ((p)->p_stat == SIDL)) 2232#define TESTAB(a, b) ((a)<<1 | (b)) 2233#define ONLYA 2 2234#define ONLYB 1 2235#define BOTH 3 2236 2237static int 2238proc_compare(p1, p2) 2239 register struct proc *p1, *p2; 2240{ 2241 2242 if (p1 == NULL) 2243 return (1); 2244 /* 2245 * see if at least one of them is runnable 2246 */ 2247 switch (TESTAB(ISRUN(p1), ISRUN(p2))) { 2248 case ONLYA: 2249 return (0); 2250 case ONLYB: 2251 return (1); 2252 case BOTH: 2253 /* 2254 * tie - favor one with highest recent cpu utilization 2255 */ 2256 if (p2->p_estcpu > p1->p_estcpu) 2257 return (1); 2258 if (p1->p_estcpu > p2->p_estcpu) 2259 return (0); 2260 return (p2->p_pid > p1->p_pid); /* tie - return highest pid */ 2261 } 2262 /* 2263 * weed out zombies 2264 */ 2265 switch (TESTAB(p1->p_stat == SZOMB, p2->p_stat == SZOMB)) { 2266 case ONLYA: 2267 return (1); 2268 case ONLYB: 2269 return (0); 2270 case BOTH: 2271 return (p2->p_pid > p1->p_pid); /* tie - return highest pid */ 2272 } 2273 /* 2274 * pick the one with the smallest sleep time 2275 */ 2276 if (p2->p_slptime > p1->p_slptime) 2277 return (0); 2278 if (p1->p_slptime > p2->p_slptime) 2279 return (1); 2280 /* 2281 * favor one sleeping in a non-interruptible sleep 2282 */ 2283 if (p1->p_flag & P_SINTR && (p2->p_flag & P_SINTR) == 0) 2284 return (1); 2285 if (p2->p_flag & P_SINTR && (p1->p_flag & P_SINTR) == 0) 2286 return (0); 2287 return (p2->p_pid > p1->p_pid); /* tie - return highest pid */ 2288} 2289 2290/* 2291 * Output char to tty; console putchar style. 2292 */ 2293int 2294tputchar(c, tp) 2295 int c; 2296 struct tty *tp; 2297{ 2298 register int s; 2299 2300 s = spltty(); 2301 if (!ISSET(tp->t_state, TS_CONNECTED)) { 2302 splx(s); 2303 return (-1); 2304 } 2305 if (c == '\n') 2306 (void)ttyoutput('\r', tp); 2307 (void)ttyoutput(c, tp); 2308 ttstart(tp); 2309 splx(s); 2310 return (0); 2311} 2312 2313/* 2314 * Sleep on chan, returning ERESTART if tty changed while we napped and 2315 * returning any errors (e.g. EINTR/ETIMEDOUT) reported by tsleep. If 2316 * the tty is revoked, restarting a pending call will redo validation done 2317 * at the start of the call. 2318 */ 2319int 2320ttysleep(tp, chan, pri, wmesg, timo) 2321 struct tty *tp; 2322 void *chan; 2323 int pri, timo; 2324 char *wmesg; 2325{ 2326 int error; 2327 int gen; 2328 2329 gen = tp->t_gen; 2330 error = tsleep(chan, pri, wmesg, timo); 2331 if (error) 2332 return (error); 2333 return (tp->t_gen == gen ? 0 : ERESTART); 2334} 2335 2336#ifdef notyet 2337/* 2338 * XXX this is usable not useful or used. Most tty drivers have 2339 * ifdefs for using ttymalloc() but assume a different interface. 2340 */ 2341/* 2342 * Allocate a tty struct. Clists in the struct will be allocated by 2343 * ttyopen(). 2344 */ 2345struct tty * 2346ttymalloc() 2347{ 2348 struct tty *tp; 2349 2350 tp = malloc(sizeof *tp, M_TTYS, M_WAITOK); 2351 bzero(tp, sizeof *tp); 2352 return (tp); 2353} 2354#endif 2355 2356#if 0 /* XXX not yet usable: session leader holds a ref (see kern_exit.c). */ 2357/* 2358 * Free a tty struct. Clists in the struct should have been freed by 2359 * ttyclose(). 2360 */ 2361void 2362ttyfree(tp) 2363 struct tty *tp; 2364{ 2365 free(tp, M_TTYS); 2366} 2367#endif /* 0 */ 2368