tty.c revision 17876
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 1.82 1996/06/12 05:07:33 gpalmer 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(); 1154#if 0 1155again: 1156#endif 1157 if (rw & FWRITE) 1158 CLR(tp->t_state, TS_TTSTOP); 1159#ifdef sun4c /* XXX */ 1160 (*tp->t_stop)(tp, rw); 1161#else 1162 (*cdevsw[major(tp->t_dev)]->d_stop)(tp, rw); 1163#endif 1164 if (rw & FREAD) { 1165 FLUSHQ(&tp->t_canq); 1166 FLUSHQ(&tp->t_rawq); 1167 CLR(tp->t_lflag, PENDIN); 1168 tp->t_rocount = 0; 1169 tp->t_rocol = 0; 1170 CLR(tp->t_state, TS_LOCAL); 1171 ttwakeup(tp); 1172 if (ISSET(tp->t_state, TS_TBLOCK)) { 1173 if (rw & FWRITE) 1174 FLUSHQ(&tp->t_outq); 1175 ttyunblock(tp); 1176 1177 /* 1178 * Don't let leave any state that might clobber the 1179 * next line discipline (although we should do more 1180 * to send the START char). Not clearing the state 1181 * may have caused the "putc to a clist with no 1182 * reserved cblocks" panic/printf. 1183 */ 1184 CLR(tp->t_state, TS_TBLOCK); 1185 1186#if 0 /* forget it, sleeping isn't always safe and we don't know when it is */ 1187 if (ISSET(tp->t_iflag, IXOFF)) { 1188 /* 1189 * XXX wait a bit in the hope that the stop 1190 * character (if any) will go out. Waiting 1191 * isn't good since it allows races. This 1192 * will be fixed when the stop character is 1193 * put in a special queue. Don't bother with 1194 * the checks in ttywait() since the timeout 1195 * will save us. 1196 */ 1197 SET(tp->t_state, TS_SO_OCOMPLETE); 1198 ttysleep(tp, TSA_OCOMPLETE(tp), TTOPRI, 1199 "ttyfls", hz / 10); 1200 /* 1201 * Don't try sending the stop character again. 1202 */ 1203 CLR(tp->t_state, TS_TBLOCK); 1204 goto again; 1205 } 1206#endif 1207 } 1208 } 1209 if (rw & FWRITE) { 1210 FLUSHQ(&tp->t_outq); 1211 ttwwakeup(tp); 1212 } 1213 splx(s); 1214} 1215 1216/* 1217 * Copy in the default termios characters. 1218 */ 1219void 1220termioschars(t) 1221 struct termios *t; 1222{ 1223 1224 bcopy(ttydefchars, t->c_cc, sizeof t->c_cc); 1225} 1226 1227/* 1228 * Old interface. 1229 */ 1230void 1231ttychars(tp) 1232 struct tty *tp; 1233{ 1234 1235 termioschars(&tp->t_termios); 1236} 1237 1238/* 1239 * Handle input high water. Send stop character for the IXOFF case. Turn 1240 * on our input flow control bit and propagate the changes to the driver. 1241 * XXX the stop character should be put in a special high priority queue. 1242 */ 1243void 1244ttyblock(tp) 1245 struct tty *tp; 1246{ 1247 1248 SET(tp->t_state, TS_TBLOCK); 1249 if (ISSET(tp->t_iflag, IXOFF) && tp->t_cc[VSTOP] != _POSIX_VDISABLE && 1250 putc(tp->t_cc[VSTOP], &tp->t_outq) != 0) 1251 CLR(tp->t_state, TS_TBLOCK); /* try again later */ 1252 ttstart(tp); 1253} 1254 1255/* 1256 * Handle input low water. Send start character for the IXOFF case. Turn 1257 * off our input flow control bit and propagate the changes to the driver. 1258 * XXX the start character should be put in a special high priority queue. 1259 */ 1260static void 1261ttyunblock(tp) 1262 struct tty *tp; 1263{ 1264 1265 CLR(tp->t_state, TS_TBLOCK); 1266 if (ISSET(tp->t_iflag, IXOFF) && tp->t_cc[VSTART] != _POSIX_VDISABLE && 1267 putc(tp->t_cc[VSTART], &tp->t_outq) != 0) 1268 SET(tp->t_state, TS_TBLOCK); /* try again later */ 1269 ttstart(tp); 1270} 1271 1272#ifdef notyet 1273/* Not used by any current (i386) drivers. */ 1274/* 1275 * Restart after an inter-char delay. 1276 */ 1277void 1278ttrstrt(tp_arg) 1279 void *tp_arg; 1280{ 1281 struct tty *tp; 1282 int s; 1283 1284#ifdef DIAGNOSTIC 1285 if (tp_arg == NULL) 1286 panic("ttrstrt"); 1287#endif 1288 tp = tp_arg; 1289 s = spltty(); 1290 1291 CLR(tp->t_state, TS_TIMEOUT); 1292 ttstart(tp); 1293 1294 splx(s); 1295} 1296#endif 1297 1298int 1299ttstart(tp) 1300 struct tty *tp; 1301{ 1302 1303 if (tp->t_oproc != NULL) /* XXX: Kludge for pty. */ 1304 (*tp->t_oproc)(tp); 1305 return (0); 1306} 1307 1308/* 1309 * "close" a line discipline 1310 */ 1311int 1312ttylclose(tp, flag) 1313 struct tty *tp; 1314 int flag; 1315{ 1316 1317 if (flag & FNONBLOCK || ttywflush(tp)) 1318 ttyflush(tp, FREAD | FWRITE); 1319 return (0); 1320} 1321 1322/* 1323 * Handle modem control transition on a tty. 1324 * Flag indicates new state of carrier. 1325 * Returns 0 if the line should be turned off, otherwise 1. 1326 */ 1327int 1328ttymodem(tp, flag) 1329 register struct tty *tp; 1330 int flag; 1331{ 1332 1333 if (ISSET(tp->t_state, TS_CARR_ON) && ISSET(tp->t_cflag, MDMBUF)) { 1334 /* 1335 * MDMBUF: do flow control according to carrier flag 1336 * XXX TS_CAR_OFLOW doesn't do anything yet. TS_TTSTOP 1337 * works if IXON and IXANY are clear. 1338 */ 1339 if (flag) { 1340 CLR(tp->t_state, TS_CAR_OFLOW); 1341 CLR(tp->t_state, TS_TTSTOP); 1342 ttstart(tp); 1343 } else if (!ISSET(tp->t_state, TS_CAR_OFLOW)) { 1344 SET(tp->t_state, TS_CAR_OFLOW); 1345 SET(tp->t_state, TS_TTSTOP); 1346#ifdef sun4c /* XXX */ 1347 (*tp->t_stop)(tp, 0); 1348#else 1349 (*cdevsw[major(tp->t_dev)]->d_stop)(tp, 0); 1350#endif 1351 } 1352 } else if (flag == 0) { 1353 /* 1354 * Lost carrier. 1355 */ 1356 CLR(tp->t_state, TS_CARR_ON); 1357 if (ISSET(tp->t_state, TS_ISOPEN) && 1358 !ISSET(tp->t_cflag, CLOCAL)) { 1359 SET(tp->t_state, TS_ZOMBIE); 1360 CLR(tp->t_state, TS_CONNECTED); 1361 if (tp->t_session && tp->t_session->s_leader) 1362 psignal(tp->t_session->s_leader, SIGHUP); 1363 ttyflush(tp, FREAD | FWRITE); 1364 return (0); 1365 } 1366 } else { 1367 /* 1368 * Carrier now on. 1369 */ 1370 SET(tp->t_state, TS_CARR_ON); 1371 if (!ISSET(tp->t_state, TS_ZOMBIE)) 1372 SET(tp->t_state, TS_CONNECTED); 1373 wakeup(TSA_CARR_ON(tp)); 1374 ttwakeup(tp); 1375 ttwwakeup(tp); 1376 } 1377 return (1); 1378} 1379 1380/* 1381 * Reinput pending characters after state switch 1382 * call at spltty(). 1383 */ 1384static void 1385ttypend(tp) 1386 register struct tty *tp; 1387{ 1388 struct clist tq; 1389 register int c; 1390 1391 CLR(tp->t_lflag, PENDIN); 1392 SET(tp->t_state, TS_TYPEN); 1393 /* 1394 * XXX this assumes too much about clist internals. It may even 1395 * fail if the cblock slush pool is empty. We can't allocate more 1396 * cblocks here because we are called from an interrupt handler 1397 * and clist_alloc_cblocks() can wait. 1398 */ 1399 tq = tp->t_rawq; 1400 bzero(&tp->t_rawq, sizeof tp->t_rawq); 1401 tp->t_rawq.c_cbmax = tq.c_cbmax; 1402 tp->t_rawq.c_cbreserved = tq.c_cbreserved; 1403 while ((c = getc(&tq)) >= 0) 1404 ttyinput(c, tp); 1405 CLR(tp->t_state, TS_TYPEN); 1406} 1407 1408/* 1409 * Process a read call on a tty device. 1410 */ 1411int 1412ttread(tp, uio, flag) 1413 register struct tty *tp; 1414 struct uio *uio; 1415 int flag; 1416{ 1417 register struct clist *qp; 1418 register int c; 1419 register tcflag_t lflag; 1420 register cc_t *cc = tp->t_cc; 1421 register struct proc *p = curproc; 1422 int s, first, error = 0; 1423 int has_stime = 0, last_cc = 0; 1424 long slp = 0; /* XXX this should be renamed `timo'. */ 1425 1426loop: 1427 s = spltty(); 1428 lflag = tp->t_lflag; 1429 /* 1430 * take pending input first 1431 */ 1432 if (ISSET(lflag, PENDIN)) { 1433 ttypend(tp); 1434 splx(s); /* reduce latency */ 1435 s = spltty(); 1436 lflag = tp->t_lflag; /* XXX ttypend() clobbers it */ 1437 } 1438 1439 /* 1440 * Hang process if it's in the background. 1441 */ 1442 if (isbackground(p, tp)) { 1443 splx(s); 1444 if ((p->p_sigignore & sigmask(SIGTTIN)) || 1445 (p->p_sigmask & sigmask(SIGTTIN)) || 1446 p->p_flag & P_PPWAIT || p->p_pgrp->pg_jobc == 0) 1447 return (EIO); 1448 pgsignal(p->p_pgrp, SIGTTIN, 1); 1449 error = ttysleep(tp, &lbolt, TTIPRI | PCATCH, "ttybg2", 0); 1450 if (error) 1451 return (error); 1452 goto loop; 1453 } 1454 1455 if (ISSET(tp->t_state, TS_ZOMBIE)) { 1456 splx(s); 1457 return (0); /* EOF */ 1458 } 1459 1460 /* 1461 * If canonical, use the canonical queue, 1462 * else use the raw queue. 1463 * 1464 * (should get rid of clists...) 1465 */ 1466 qp = ISSET(lflag, ICANON) ? &tp->t_canq : &tp->t_rawq; 1467 1468 if (flag & IO_NDELAY) { 1469 if (qp->c_cc > 0) 1470 goto read; 1471 if (!ISSET(lflag, ICANON) && cc[VMIN] == 0) { 1472 splx(s); 1473 return (0); 1474 } 1475 splx(s); 1476 return (EWOULDBLOCK); 1477 } 1478 if (!ISSET(lflag, ICANON)) { 1479 int m = cc[VMIN]; 1480 long t = cc[VTIME]; 1481 struct timeval stime, timecopy; 1482 int x; 1483 1484 /* 1485 * Check each of the four combinations. 1486 * (m > 0 && t == 0) is the normal read case. 1487 * It should be fairly efficient, so we check that and its 1488 * companion case (m == 0 && t == 0) first. 1489 * For the other two cases, we compute the target sleep time 1490 * into slp. 1491 */ 1492 if (t == 0) { 1493 if (qp->c_cc < m) 1494 goto sleep; 1495 if (qp->c_cc > 0) 1496 goto read; 1497 1498 /* m, t and qp->c_cc are all 0. 0 is enough input. */ 1499 splx(s); 1500 return (0); 1501 } 1502 t *= 100000; /* time in us */ 1503#define diff(t1, t2) (((t1).tv_sec - (t2).tv_sec) * 1000000 + \ 1504 ((t1).tv_usec - (t2).tv_usec)) 1505 if (m > 0) { 1506 if (qp->c_cc <= 0) 1507 goto sleep; 1508 if (qp->c_cc >= m) 1509 goto read; 1510 x = splclock(); 1511 timecopy = time; 1512 splx(x); 1513 if (!has_stime) { 1514 /* first character, start timer */ 1515 has_stime = 1; 1516 stime = timecopy; 1517 slp = t; 1518 } else if (qp->c_cc > last_cc) { 1519 /* got a character, restart timer */ 1520 stime = timecopy; 1521 slp = t; 1522 } else { 1523 /* nothing, check expiration */ 1524 slp = t - diff(timecopy, stime); 1525 if (slp <= 0) 1526 goto read; 1527 } 1528 last_cc = qp->c_cc; 1529 } else { /* m == 0 */ 1530 if (qp->c_cc > 0) 1531 goto read; 1532 x = splclock(); 1533 timecopy = time; 1534 splx(x); 1535 if (!has_stime) { 1536 has_stime = 1; 1537 stime = timecopy; 1538 slp = t; 1539 } else { 1540 slp = t - diff(timecopy, stime); 1541 if (slp <= 0) { 1542 /* Timed out, but 0 is enough input. */ 1543 splx(s); 1544 return (0); 1545 } 1546 } 1547 } 1548#undef diff 1549 /* 1550 * Rounding down may make us wake up just short 1551 * of the target, so we round up. 1552 * The formula is ceiling(slp * hz/1000000). 1553 * 32-bit arithmetic is enough for hz < 169. 1554 * XXX see hzto() for how to avoid overflow if hz 1555 * is large (divide by `tick' and/or arrange to 1556 * use hzto() if hz is large). 1557 */ 1558 slp = (long) (((u_long)slp * hz) + 999999) / 1000000; 1559 goto sleep; 1560 } 1561 if (qp->c_cc <= 0) { 1562sleep: 1563 /* 1564 * There is no input, or not enough input and we can block. 1565 */ 1566 error = ttysleep(tp, TSA_HUP_OR_INPUT(tp), TTIPRI | PCATCH, 1567 ISSET(tp->t_state, TS_CONNECTED) ? 1568 "ttyin" : "ttyhup", (int)slp); 1569 splx(s); 1570 if (error == EWOULDBLOCK) 1571 error = 0; 1572 else if (error) 1573 return (error); 1574 /* 1575 * XXX what happens if another process eats some input 1576 * while we are asleep (not just here)? It would be 1577 * safest to detect changes and reset our state variables 1578 * (has_stime and last_cc). 1579 */ 1580 slp = 0; 1581 goto loop; 1582 } 1583read: 1584 splx(s); 1585 /* 1586 * Input present, check for input mapping and processing. 1587 */ 1588 first = 1; 1589 if (ISSET(lflag, ICANON | ISIG)) 1590 goto slowcase; 1591 for (;;) { 1592 char ibuf[IBUFSIZ]; 1593 int icc; 1594 1595 icc = imin(uio->uio_resid, IBUFSIZ); 1596 icc = q_to_b(qp, ibuf, icc); 1597 if (icc <= 0) { 1598 if (first) 1599 goto loop; 1600 break; 1601 } 1602 error = uiomove(ibuf, icc, uio); 1603 /* 1604 * XXX if there was an error then we should ungetc() the 1605 * unmoved chars and reduce icc here. 1606 */ 1607#if NSNP > 0 1608 if (ISSET(tp->t_lflag, ECHO) && 1609 ISSET(tp->t_state, TS_SNOOP) && tp->t_sc != NULL) 1610 snpin((struct snoop *)tp->t_sc, ibuf, icc); 1611#endif 1612 if (error) 1613 break; 1614 if (uio->uio_resid == 0) 1615 break; 1616 first = 0; 1617 } 1618 goto out; 1619slowcase: 1620 for (;;) { 1621 c = getc(qp); 1622 if (c < 0) { 1623 if (first) 1624 goto loop; 1625 break; 1626 } 1627 /* 1628 * delayed suspend (^Y) 1629 */ 1630 if (CCEQ(cc[VDSUSP], c) && ISSET(lflag, ISIG)) { 1631 pgsignal(tp->t_pgrp, SIGTSTP, 1); 1632 if (first) { 1633 error = ttysleep(tp, &lbolt, TTIPRI | PCATCH, 1634 "ttybg3", 0); 1635 if (error) 1636 break; 1637 goto loop; 1638 } 1639 break; 1640 } 1641 /* 1642 * Interpret EOF only in canonical mode. 1643 */ 1644 if (CCEQ(cc[VEOF], c) && ISSET(lflag, ICANON)) 1645 break; 1646 /* 1647 * Give user character. 1648 */ 1649 error = ureadc(c, uio); 1650 if (error) 1651 /* XXX should ungetc(c, qp). */ 1652 break; 1653#if NSNP > 0 1654 /* 1655 * Only snoop directly on input in echo mode. Non-echoed 1656 * input will be snooped later iff the application echoes it. 1657 */ 1658 if (ISSET(tp->t_lflag, ECHO) && 1659 ISSET(tp->t_state, TS_SNOOP) && tp->t_sc != NULL) 1660 snpinc((struct snoop *)tp->t_sc, (char)c); 1661#endif 1662 if (uio->uio_resid == 0) 1663 break; 1664 /* 1665 * In canonical mode check for a "break character" 1666 * marking the end of a "line of input". 1667 */ 1668 if (ISSET(lflag, ICANON) && TTBREAKC(c)) 1669 break; 1670 first = 0; 1671 } 1672 1673out: 1674 /* 1675 * Look to unblock input now that (presumably) 1676 * the input queue has gone down. 1677 */ 1678 s = spltty(); 1679 if (ISSET(tp->t_state, TS_TBLOCK) && 1680 tp->t_rawq.c_cc + tp->t_canq.c_cc <= I_LOW_WATER) 1681 ttyunblock(tp); 1682 splx(s); 1683 1684 return (error); 1685} 1686 1687/* 1688 * Check the output queue on tp for space for a kernel message (from uprintf 1689 * or tprintf). Allow some space over the normal hiwater mark so we don't 1690 * lose messages due to normal flow control, but don't let the tty run amok. 1691 * Sleeps here are not interruptible, but we return prematurely if new signals 1692 * arrive. 1693 */ 1694int 1695ttycheckoutq(tp, wait) 1696 register struct tty *tp; 1697 int wait; 1698{ 1699 int hiwat, s, oldsig; 1700 1701 hiwat = tp->t_hiwat; 1702 s = spltty(); 1703 oldsig = wait ? curproc->p_siglist : 0; 1704 if (tp->t_outq.c_cc > hiwat + OBUFSIZ + 100) 1705 while (tp->t_outq.c_cc > hiwat) { 1706 ttstart(tp); 1707 if (tp->t_outq.c_cc <= hiwat) 1708 break; 1709 if (wait == 0 || curproc->p_siglist != oldsig) { 1710 splx(s); 1711 return (0); 1712 } 1713 SET(tp->t_state, TS_SO_OLOWAT); 1714 tsleep(TSA_OLOWAT(tp), PZERO - 1, "ttoutq", hz); 1715 } 1716 splx(s); 1717 return (1); 1718} 1719 1720/* 1721 * Process a write call on a tty device. 1722 */ 1723int 1724ttwrite(tp, uio, flag) 1725 register struct tty *tp; 1726 register struct uio *uio; 1727 int flag; 1728{ 1729 register char *cp = NULL; 1730 register int cc, ce; 1731 register struct proc *p; 1732 int i, hiwat, cnt, error, s; 1733 char obuf[OBUFSIZ]; 1734 1735 hiwat = tp->t_hiwat; 1736 cnt = uio->uio_resid; 1737 error = 0; 1738 cc = 0; 1739loop: 1740 s = spltty(); 1741 if (ISSET(tp->t_state, TS_ZOMBIE)) { 1742 splx(s); 1743 if (uio->uio_resid == cnt) 1744 error = EIO; 1745 goto out; 1746 } 1747 if (!ISSET(tp->t_state, TS_CONNECTED)) { 1748 if (flag & IO_NDELAY) { 1749 splx(s); 1750 error = EWOULDBLOCK; 1751 goto out; 1752 } 1753 error = ttysleep(tp, TSA_CARR_ON(tp), TTIPRI | PCATCH, 1754 "ttydcd", 0); 1755 splx(s); 1756 if (error) 1757 goto out; 1758 goto loop; 1759 } 1760 splx(s); 1761 /* 1762 * Hang the process if it's in the background. 1763 */ 1764 p = curproc; 1765 if (isbackground(p, tp) && 1766 ISSET(tp->t_lflag, TOSTOP) && (p->p_flag & P_PPWAIT) == 0 && 1767 (p->p_sigignore & sigmask(SIGTTOU)) == 0 && 1768 (p->p_sigmask & sigmask(SIGTTOU)) == 0 && 1769 p->p_pgrp->pg_jobc) { 1770 pgsignal(p->p_pgrp, SIGTTOU, 1); 1771 error = ttysleep(tp, &lbolt, TTIPRI | PCATCH, "ttybg4", 0); 1772 if (error) 1773 goto out; 1774 goto loop; 1775 } 1776 /* 1777 * Process the user's data in at most OBUFSIZ chunks. Perform any 1778 * output translation. Keep track of high water mark, sleep on 1779 * overflow awaiting device aid in acquiring new space. 1780 */ 1781 while (uio->uio_resid > 0 || cc > 0) { 1782 if (ISSET(tp->t_lflag, FLUSHO)) { 1783 uio->uio_resid = 0; 1784 return (0); 1785 } 1786 if (tp->t_outq.c_cc > hiwat) 1787 goto ovhiwat; 1788 /* 1789 * Grab a hunk of data from the user, unless we have some 1790 * leftover from last time. 1791 */ 1792 if (cc == 0) { 1793 cc = imin(uio->uio_resid, OBUFSIZ); 1794 cp = obuf; 1795 error = uiomove(cp, cc, uio); 1796 if (error) { 1797 cc = 0; 1798 break; 1799 } 1800#if NSNP > 0 1801 if (ISSET(tp->t_state, TS_SNOOP) && tp->t_sc != NULL) 1802 snpin((struct snoop *)tp->t_sc, cp, cc); 1803#endif 1804 } 1805 /* 1806 * If nothing fancy need be done, grab those characters we 1807 * can handle without any of ttyoutput's processing and 1808 * just transfer them to the output q. For those chars 1809 * which require special processing (as indicated by the 1810 * bits in char_type), call ttyoutput. After processing 1811 * a hunk of data, look for FLUSHO so ^O's will take effect 1812 * immediately. 1813 */ 1814 while (cc > 0) { 1815 if (!ISSET(tp->t_oflag, OPOST)) 1816 ce = cc; 1817 else { 1818 ce = cc - scanc((u_int)cc, (u_char *)cp, 1819 (u_char *)char_type, CCLASSMASK); 1820 /* 1821 * If ce is zero, then we're processing 1822 * a special character through ttyoutput. 1823 */ 1824 if (ce == 0) { 1825 tp->t_rocount = 0; 1826 if (ttyoutput(*cp, tp) >= 0) { 1827 /* No Clists, wait a bit. */ 1828 ttstart(tp); 1829 if (flag & IO_NDELAY) { 1830 error = EWOULDBLOCK; 1831 goto out; 1832 } 1833 error = ttysleep(tp, &lbolt, 1834 TTOPRI|PCATCH, 1835 "ttybf1", 0); 1836 if (error) 1837 goto out; 1838 goto loop; 1839 } 1840 cp++; 1841 cc--; 1842 if (ISSET(tp->t_lflag, FLUSHO) || 1843 tp->t_outq.c_cc > hiwat) 1844 goto ovhiwat; 1845 continue; 1846 } 1847 } 1848 /* 1849 * A bunch of normal characters have been found. 1850 * Transfer them en masse to the output queue and 1851 * continue processing at the top of the loop. 1852 * If there are any further characters in this 1853 * <= OBUFSIZ chunk, the first should be a character 1854 * requiring special handling by ttyoutput. 1855 */ 1856 tp->t_rocount = 0; 1857 i = b_to_q(cp, ce, &tp->t_outq); 1858 ce -= i; 1859 tp->t_column += ce; 1860 cp += ce, cc -= ce, tk_nout += ce; 1861 tp->t_outcc += ce; 1862 if (i > 0) { 1863 /* No Clists, wait a bit. */ 1864 ttstart(tp); 1865 if (flag & IO_NDELAY) { 1866 error = EWOULDBLOCK; 1867 goto out; 1868 } 1869 error = ttysleep(tp, &lbolt, TTOPRI | PCATCH, 1870 "ttybf2", 0); 1871 if (error) 1872 goto out; 1873 goto loop; 1874 } 1875 if (ISSET(tp->t_lflag, FLUSHO) || 1876 tp->t_outq.c_cc > hiwat) 1877 break; 1878 } 1879 ttstart(tp); 1880 } 1881out: 1882 /* 1883 * If cc is nonzero, we leave the uio structure inconsistent, as the 1884 * offset and iov pointers have moved forward, but it doesn't matter 1885 * (the call will either return short or restart with a new uio). 1886 */ 1887 uio->uio_resid += cc; 1888 return (error); 1889 1890ovhiwat: 1891 ttstart(tp); 1892 s = spltty(); 1893 /* 1894 * This can only occur if FLUSHO is set in t_lflag, 1895 * or if ttstart/oproc is synchronous (or very fast). 1896 */ 1897 if (tp->t_outq.c_cc <= hiwat) { 1898 splx(s); 1899 goto loop; 1900 } 1901 if (flag & IO_NDELAY) { 1902 splx(s); 1903 uio->uio_resid += cc; 1904 return (uio->uio_resid == cnt ? EWOULDBLOCK : 0); 1905 } 1906 SET(tp->t_state, TS_SO_OLOWAT); 1907 error = ttysleep(tp, TSA_OLOWAT(tp), TTOPRI | PCATCH, "ttywri", 1908 tp->t_timeout); 1909 splx(s); 1910 if (error == EWOULDBLOCK) 1911 error = EIO; 1912 if (error) 1913 goto out; 1914 goto loop; 1915} 1916 1917/* 1918 * Rubout one character from the rawq of tp 1919 * as cleanly as possible. 1920 */ 1921static void 1922ttyrub(c, tp) 1923 register int c; 1924 register struct tty *tp; 1925{ 1926 register char *cp; 1927 register int savecol; 1928 int tabc, s; 1929 1930 if (!ISSET(tp->t_lflag, ECHO) || ISSET(tp->t_lflag, EXTPROC)) 1931 return; 1932 CLR(tp->t_lflag, FLUSHO); 1933 if (ISSET(tp->t_lflag, ECHOE)) { 1934 if (tp->t_rocount == 0) { 1935 /* 1936 * Screwed by ttwrite; retype 1937 */ 1938 ttyretype(tp); 1939 return; 1940 } 1941 if (c == ('\t' | TTY_QUOTE) || c == ('\n' | TTY_QUOTE)) 1942 ttyrubo(tp, 2); 1943 else { 1944 CLR(c, ~TTY_CHARMASK); 1945 switch (CCLASS(c)) { 1946 case ORDINARY: 1947 ttyrubo(tp, 1); 1948 break; 1949 case BACKSPACE: 1950 case CONTROL: 1951 case NEWLINE: 1952 case RETURN: 1953 case VTAB: 1954 if (ISSET(tp->t_lflag, ECHOCTL)) 1955 ttyrubo(tp, 2); 1956 break; 1957 case TAB: 1958 if (tp->t_rocount < tp->t_rawq.c_cc) { 1959 ttyretype(tp); 1960 return; 1961 } 1962 s = spltty(); 1963 savecol = tp->t_column; 1964 SET(tp->t_state, TS_CNTTB); 1965 SET(tp->t_lflag, FLUSHO); 1966 tp->t_column = tp->t_rocol; 1967 cp = tp->t_rawq.c_cf; 1968 if (cp) 1969 tabc = *cp; /* XXX FIX NEXTC */ 1970 for (; cp; cp = nextc(&tp->t_rawq, cp, &tabc)) 1971 ttyecho(tabc, tp); 1972 CLR(tp->t_lflag, FLUSHO); 1973 CLR(tp->t_state, TS_CNTTB); 1974 splx(s); 1975 1976 /* savecol will now be length of the tab. */ 1977 savecol -= tp->t_column; 1978 tp->t_column += savecol; 1979 if (savecol > 8) 1980 savecol = 8; /* overflow screw */ 1981 while (--savecol >= 0) 1982 (void)ttyoutput('\b', tp); 1983 break; 1984 default: /* XXX */ 1985#define PANICSTR "ttyrub: would panic c = %d, val = %d\n" 1986 (void)printf(PANICSTR, c, CCLASS(c)); 1987#ifdef notdef 1988 panic(PANICSTR, c, CCLASS(c)); 1989#endif 1990 } 1991 } 1992 } else if (ISSET(tp->t_lflag, ECHOPRT)) { 1993 if (!ISSET(tp->t_state, TS_ERASE)) { 1994 SET(tp->t_state, TS_ERASE); 1995 (void)ttyoutput('\\', tp); 1996 } 1997 ttyecho(c, tp); 1998 } else 1999 ttyecho(tp->t_cc[VERASE], tp); 2000 --tp->t_rocount; 2001} 2002 2003/* 2004 * Back over cnt characters, erasing them. 2005 */ 2006static void 2007ttyrubo(tp, cnt) 2008 register struct tty *tp; 2009 int cnt; 2010{ 2011 2012 while (cnt-- > 0) { 2013 (void)ttyoutput('\b', tp); 2014 (void)ttyoutput(' ', tp); 2015 (void)ttyoutput('\b', tp); 2016 } 2017} 2018 2019/* 2020 * ttyretype -- 2021 * Reprint the rawq line. Note, it is assumed that c_cc has already 2022 * been checked. 2023 */ 2024static void 2025ttyretype(tp) 2026 register struct tty *tp; 2027{ 2028 register char *cp; 2029 int s, c; 2030 2031 /* Echo the reprint character. */ 2032 if (tp->t_cc[VREPRINT] != _POSIX_VDISABLE) 2033 ttyecho(tp->t_cc[VREPRINT], tp); 2034 2035 (void)ttyoutput('\n', tp); 2036 2037 /* 2038 * XXX 2039 * FIX: NEXTC IS BROKEN - DOESN'T CHECK QUOTE 2040 * BIT OF FIRST CHAR. 2041 */ 2042 s = spltty(); 2043 for (cp = tp->t_canq.c_cf, c = (cp != NULL ? *cp : 0); 2044 cp != NULL; cp = nextc(&tp->t_canq, cp, &c)) 2045 ttyecho(c, tp); 2046 for (cp = tp->t_rawq.c_cf, c = (cp != NULL ? *cp : 0); 2047 cp != NULL; cp = nextc(&tp->t_rawq, cp, &c)) 2048 ttyecho(c, tp); 2049 CLR(tp->t_state, TS_ERASE); 2050 splx(s); 2051 2052 tp->t_rocount = tp->t_rawq.c_cc; 2053 tp->t_rocol = 0; 2054} 2055 2056/* 2057 * Echo a typed character to the terminal. 2058 */ 2059static void 2060ttyecho(c, tp) 2061 register int c; 2062 register struct tty *tp; 2063{ 2064 2065 if (!ISSET(tp->t_state, TS_CNTTB)) 2066 CLR(tp->t_lflag, FLUSHO); 2067 if ((!ISSET(tp->t_lflag, ECHO) && 2068 (c != '\n' || !ISSET(tp->t_lflag, ECHONL))) || 2069 ISSET(tp->t_lflag, EXTPROC)) 2070 return; 2071 if (ISSET(tp->t_lflag, ECHOCTL) && 2072 ((ISSET(c, TTY_CHARMASK) <= 037 && c != '\t' && c != '\n') || 2073 ISSET(c, TTY_CHARMASK) == 0177)) { 2074 (void)ttyoutput('^', tp); 2075 CLR(c, ~TTY_CHARMASK); 2076 if (c == 0177) 2077 c = '?'; 2078 else 2079 c += 'A' - 1; 2080 } 2081 (void)ttyoutput(c, tp); 2082} 2083 2084/* 2085 * Wake up any readers on a tty. 2086 */ 2087void 2088ttwakeup(tp) 2089 register struct tty *tp; 2090{ 2091 2092 if (tp->t_rsel.si_pid != 0) 2093 selwakeup(&tp->t_rsel); 2094 if (ISSET(tp->t_state, TS_ASYNC)) 2095 pgsignal(tp->t_pgrp, SIGIO, 1); 2096 wakeup(TSA_HUP_OR_INPUT(tp)); 2097} 2098 2099/* 2100 * Wake up any writers on a tty. 2101 */ 2102void 2103ttwwakeup(tp) 2104 register struct tty *tp; 2105{ 2106 2107 if (tp->t_wsel.si_pid != 0 && tp->t_outq.c_cc <= tp->t_lowat) 2108 selwakeup(&tp->t_wsel); 2109 if (ISSET(tp->t_state, TS_BUSY | TS_SO_OCOMPLETE) == 2110 TS_SO_OCOMPLETE && tp->t_outq.c_cc == 0) { 2111 CLR(tp->t_state, TS_SO_OCOMPLETE); 2112 wakeup(TSA_OCOMPLETE(tp)); 2113 } 2114 if (ISSET(tp->t_state, TS_SO_OLOWAT) && 2115 tp->t_outq.c_cc <= tp->t_lowat) { 2116 CLR(tp->t_state, TS_SO_OLOWAT); 2117 wakeup(TSA_OLOWAT(tp)); 2118 } 2119} 2120 2121/* 2122 * Look up a code for a specified speed in a conversion table; 2123 * used by drivers to map software speed values to hardware parameters. 2124 */ 2125int 2126ttspeedtab(speed, table) 2127 int speed; 2128 register struct speedtab *table; 2129{ 2130 2131 for ( ; table->sp_speed != -1; table++) 2132 if (table->sp_speed == speed) 2133 return (table->sp_code); 2134 return (-1); 2135} 2136 2137/* 2138 * Set tty hi and low water marks. 2139 * 2140 * Try to arrange the dynamics so there's about one second 2141 * from hi to low water. 2142 * 2143 */ 2144void 2145ttsetwater(tp) 2146 struct tty *tp; 2147{ 2148 register int cps, x; 2149 2150#define CLAMP(x, h, l) ((x) > h ? h : ((x) < l) ? l : (x)) 2151 2152 cps = tp->t_ospeed / 10; 2153 tp->t_lowat = x = CLAMP(cps / 2, TTMAXLOWAT, TTMINLOWAT); 2154 x += cps; 2155 x = CLAMP(x, TTMAXHIWAT, TTMINHIWAT); 2156 tp->t_hiwat = roundup(x, CBSIZE); 2157#undef CLAMP 2158} 2159 2160/* 2161 * Report on state of foreground process group. 2162 */ 2163void 2164ttyinfo(tp) 2165 register struct tty *tp; 2166{ 2167 register struct proc *p, *pick; 2168 struct timeval utime, stime; 2169 int tmp; 2170 2171 if (ttycheckoutq(tp,0) == 0) 2172 return; 2173 2174 /* Print load average. */ 2175 tmp = (averunnable.ldavg[0] * 100 + FSCALE / 2) >> FSHIFT; 2176 ttyprintf(tp, "load: %d.%02d ", tmp / 100, tmp % 100); 2177 2178 if (tp->t_session == NULL) 2179 ttyprintf(tp, "not a controlling terminal\n"); 2180 else if (tp->t_pgrp == NULL) 2181 ttyprintf(tp, "no foreground process group\n"); 2182 else if ((p = tp->t_pgrp->pg_members.lh_first) == 0) 2183 ttyprintf(tp, "empty foreground process group\n"); 2184 else { 2185 /* Pick interesting process. */ 2186 for (pick = NULL; p != 0; p = p->p_pglist.le_next) 2187 if (proc_compare(pick, p)) 2188 pick = p; 2189 2190 ttyprintf(tp, " cmd: %s %d [%s] ", pick->p_comm, pick->p_pid, 2191 pick->p_stat == SRUN ? "running" : 2192 pick->p_wmesg ? pick->p_wmesg : "iowait"); 2193 2194 calcru(pick, &utime, &stime, NULL); 2195 2196 /* Print user time. */ 2197 ttyprintf(tp, "%d.%02du ", 2198 utime.tv_sec, utime.tv_usec / 10000); 2199 2200 /* Print system time. */ 2201 ttyprintf(tp, "%d.%02ds ", 2202 stime.tv_sec, stime.tv_usec / 10000); 2203 2204#define pgtok(a) (((a) * PAGE_SIZE) / 1024) 2205 /* Print percentage cpu, resident set size. */ 2206 tmp = (pick->p_pctcpu * 10000 + FSCALE / 2) >> FSHIFT; 2207 ttyprintf(tp, "%d%% %dk\n", 2208 tmp / 100, 2209 pick->p_stat == SIDL || pick->p_stat == SZOMB ? 0 : 2210#ifdef pmap_resident_count 2211 pgtok(pmap_resident_count(&pick->p_vmspace->vm_pmap)) 2212#else 2213 pgtok(pick->p_vmspace->vm_rssize) 2214#endif 2215 ); 2216 } 2217 tp->t_rocount = 0; /* so pending input will be retyped if BS */ 2218} 2219 2220/* 2221 * Returns 1 if p2 is "better" than p1 2222 * 2223 * The algorithm for picking the "interesting" process is thus: 2224 * 2225 * 1) Only foreground processes are eligible - implied. 2226 * 2) Runnable processes are favored over anything else. The runner 2227 * with the highest cpu utilization is picked (p_estcpu). Ties are 2228 * broken by picking the highest pid. 2229 * 3) The sleeper with the shortest sleep time is next. With ties, 2230 * we pick out just "short-term" sleepers (P_SINTR == 0). 2231 * 4) Further ties are broken by picking the highest pid. 2232 */ 2233#define ISRUN(p) (((p)->p_stat == SRUN) || ((p)->p_stat == SIDL)) 2234#define TESTAB(a, b) ((a)<<1 | (b)) 2235#define ONLYA 2 2236#define ONLYB 1 2237#define BOTH 3 2238 2239static int 2240proc_compare(p1, p2) 2241 register struct proc *p1, *p2; 2242{ 2243 2244 if (p1 == NULL) 2245 return (1); 2246 /* 2247 * see if at least one of them is runnable 2248 */ 2249 switch (TESTAB(ISRUN(p1), ISRUN(p2))) { 2250 case ONLYA: 2251 return (0); 2252 case ONLYB: 2253 return (1); 2254 case BOTH: 2255 /* 2256 * tie - favor one with highest recent cpu utilization 2257 */ 2258 if (p2->p_estcpu > p1->p_estcpu) 2259 return (1); 2260 if (p1->p_estcpu > p2->p_estcpu) 2261 return (0); 2262 return (p2->p_pid > p1->p_pid); /* tie - return highest pid */ 2263 } 2264 /* 2265 * weed out zombies 2266 */ 2267 switch (TESTAB(p1->p_stat == SZOMB, p2->p_stat == SZOMB)) { 2268 case ONLYA: 2269 return (1); 2270 case ONLYB: 2271 return (0); 2272 case BOTH: 2273 return (p2->p_pid > p1->p_pid); /* tie - return highest pid */ 2274 } 2275 /* 2276 * pick the one with the smallest sleep time 2277 */ 2278 if (p2->p_slptime > p1->p_slptime) 2279 return (0); 2280 if (p1->p_slptime > p2->p_slptime) 2281 return (1); 2282 /* 2283 * favor one sleeping in a non-interruptible sleep 2284 */ 2285 if (p1->p_flag & P_SINTR && (p2->p_flag & P_SINTR) == 0) 2286 return (1); 2287 if (p2->p_flag & P_SINTR && (p1->p_flag & P_SINTR) == 0) 2288 return (0); 2289 return (p2->p_pid > p1->p_pid); /* tie - return highest pid */ 2290} 2291 2292/* 2293 * Output char to tty; console putchar style. 2294 */ 2295int 2296tputchar(c, tp) 2297 int c; 2298 struct tty *tp; 2299{ 2300 register int s; 2301 2302 s = spltty(); 2303 if (!ISSET(tp->t_state, TS_CONNECTED)) { 2304 splx(s); 2305 return (-1); 2306 } 2307 if (c == '\n') 2308 (void)ttyoutput('\r', tp); 2309 (void)ttyoutput(c, tp); 2310 ttstart(tp); 2311 splx(s); 2312 return (0); 2313} 2314 2315/* 2316 * Sleep on chan, returning ERESTART if tty changed while we napped and 2317 * returning any errors (e.g. EINTR/EWOULDBLOCK) reported by tsleep. If 2318 * the tty is revoked, restarting a pending call will redo validation done 2319 * at the start of the call. 2320 */ 2321int 2322ttysleep(tp, chan, pri, wmesg, timo) 2323 struct tty *tp; 2324 void *chan; 2325 int pri, timo; 2326 char *wmesg; 2327{ 2328 int error; 2329 int gen; 2330 2331 gen = tp->t_gen; 2332 error = tsleep(chan, pri, wmesg, timo); 2333 if (error) 2334 return (error); 2335 return (tp->t_gen == gen ? 0 : ERESTART); 2336} 2337 2338#ifdef notyet 2339/* 2340 * XXX this is usable not useful or used. Most tty drivers have 2341 * ifdefs for using ttymalloc() but assume a different interface. 2342 */ 2343/* 2344 * Allocate a tty struct. Clists in the struct will be allocated by 2345 * ttyopen(). 2346 */ 2347struct tty * 2348ttymalloc() 2349{ 2350 struct tty *tp; 2351 2352 tp = malloc(sizeof *tp, M_TTYS, M_WAITOK); 2353 bzero(tp, sizeof *tp); 2354 return (tp); 2355} 2356#endif 2357 2358#if 0 /* XXX not yet usable: session leader holds a ref (see kern_exit.c). */ 2359/* 2360 * Free a tty struct. Clists in the struct should have been freed by 2361 * ttyclose(). 2362 */ 2363void 2364ttyfree(tp) 2365 struct tty *tp; 2366{ 2367 free(tp, M_TTYS); 2368} 2369#endif /* 0 */ 2370