1 /*- 2 * Copyright (c) 1982, 1986, 1990, 1991, 1993 3 * The Regents of the University of California. All rights reserved. 4 * (c) UNIX System Laboratories, Inc. 5 * All or some portions of this file are derived from material licensed 6 * to the University of California by American Telephone and Telegraph 7 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 8 * the permission of UNIX System Laboratories, Inc. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the University of 21 * California, Berkeley and its contributors. 22 * 4. Neither the name of the University nor the names of its contributors 23 * may be used to endorse or promote products derived from this software 24 * without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36 * SUCH DAMAGE. 37 * 38 * @(#)tty.c 8.8 (Berkeley) 1/21/94 39 * $FreeBSD: src/sys/kern/tty.c,v 1.129.2.5 2002/03/11 01:32:31 dd Exp $ 40 * $DragonFly: src/sys/kern/tty.c,v 1.12 2004/09/13 16:22:36 dillon Exp $ 41 */ 42 43 /*- 44 * TODO: 45 * o Fix races for sending the start char in ttyflush(). 46 * o Handle inter-byte timeout for "MIN > 0, TIME > 0" in ttyselect(). 47 * With luck, there will be MIN chars before select() returns(). 48 * o Handle CLOCAL consistently for ptys. Perhaps disallow setting it. 49 * o Don't allow input in TS_ZOMBIE case. It would be visible through 50 * FIONREAD. 51 * o Do the new sio locking stuff here and use it to avoid special 52 * case for EXTPROC? 53 * o Lock PENDIN too? 54 * o Move EXTPROC and/or PENDIN to t_state? 55 * o Wrap most of ttioctl in spltty/splx. 56 * o Implement TIOCNOTTY or remove it from <sys/ioctl.h>. 57 * o Send STOP if IXOFF is toggled off while TS_TBLOCK is set. 58 * o Don't allow certain termios flags to affect disciplines other 59 * than TTYDISC. Cancel their effects before switch disciplines 60 * and ignore them if they are set while we are in another 61 * discipline. 62 * o Now that historical speed conversions are handled here, don't 63 * do them in drivers. 64 * o Check for TS_CARR_ON being set while everything is closed and not 65 * waiting for carrier. TS_CARR_ON isn't cleared if nothing is open, 66 * so it would live until the next open even if carrier drops. 67 * o Restore TS_WOPEN since it is useful in pstat. It must be cleared 68 * only when _all_ openers leave open(). 69 */ 70 71 #include "opt_compat.h" 72 #include "opt_uconsole.h" 73 74 #include <sys/param.h> 75 #include <sys/systm.h> 76 #include <sys/filio.h> 77 #if defined(COMPAT_43) || defined(COMPAT_SUNOS) 78 #include <sys/ioctl_compat.h> 79 #endif 80 #include <sys/proc.h> 81 #define TTYDEFCHARS 82 #include <sys/tty.h> 83 #undef TTYDEFCHARS 84 #include <sys/fcntl.h> 85 #include <sys/conf.h> 86 #include <sys/dkstat.h> 87 #include <sys/poll.h> 88 #include <sys/kernel.h> 89 #include <sys/vnode.h> 90 #include <sys/signalvar.h> 91 #include <sys/resourcevar.h> 92 #include <sys/malloc.h> 93 #include <sys/filedesc.h> 94 #include <sys/sysctl.h> 95 #include <sys/thread2.h> 96 97 #include <vm/vm.h> 98 #include <sys/lock.h> 99 #include <vm/pmap.h> 100 #include <vm/vm_map.h> 101 102 MALLOC_DEFINE(M_TTYS, "ttys", "tty data structures"); 103 104 static int proc_compare (struct proc *p1, struct proc *p2); 105 static int ttnread (struct tty *tp); 106 static void ttyecho (int c, struct tty *tp); 107 static int ttyoutput (int c, struct tty *tp); 108 static void ttypend (struct tty *tp); 109 static void ttyretype (struct tty *tp); 110 static void ttyrub (int c, struct tty *tp); 111 static void ttyrubo (struct tty *tp, int cnt); 112 static void ttyunblock (struct tty *tp); 113 static int ttywflush (struct tty *tp); 114 static int filt_ttyread (struct knote *kn, long hint); 115 static void filt_ttyrdetach (struct knote *kn); 116 static int filt_ttywrite (struct knote *kn, long hint); 117 static void filt_ttywdetach (struct knote *kn); 118 119 /* 120 * Table with character classes and parity. The 8th bit indicates parity, 121 * the 7th bit indicates the character is an alphameric or underscore (for 122 * ALTWERASE), and the low 6 bits indicate delay type. If the low 6 bits 123 * are 0 then the character needs no special processing on output; classes 124 * other than 0 might be translated or (not currently) require delays. 125 */ 126 #define E 0x00 /* Even parity. */ 127 #define O 0x80 /* Odd parity. */ 128 #define PARITY(c) (char_type[c] & O) 129 130 #define ALPHA 0x40 /* Alpha or underscore. */ 131 #define ISALPHA(c) (char_type[(c) & TTY_CHARMASK] & ALPHA) 132 133 #define CCLASSMASK 0x3f 134 #define CCLASS(c) (char_type[c] & CCLASSMASK) 135 136 #define BS BACKSPACE 137 #define CC CONTROL 138 #define CR RETURN 139 #define NA ORDINARY | ALPHA 140 #define NL NEWLINE 141 #define NO ORDINARY 142 #define TB TAB 143 #define VT VTAB 144 145 static u_char const char_type[] = { 146 E|CC, O|CC, O|CC, E|CC, O|CC, E|CC, E|CC, O|CC, /* nul - bel */ 147 O|BS, E|TB, E|NL, O|CC, E|VT, O|CR, O|CC, E|CC, /* bs - si */ 148 O|CC, E|CC, E|CC, O|CC, E|CC, O|CC, O|CC, E|CC, /* dle - etb */ 149 E|CC, O|CC, O|CC, E|CC, O|CC, E|CC, E|CC, O|CC, /* can - us */ 150 O|NO, E|NO, E|NO, O|NO, E|NO, O|NO, O|NO, E|NO, /* sp - ' */ 151 E|NO, O|NO, O|NO, E|NO, O|NO, E|NO, E|NO, O|NO, /* ( - / */ 152 E|NA, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* 0 - 7 */ 153 O|NA, E|NA, E|NO, O|NO, E|NO, O|NO, O|NO, E|NO, /* 8 - ? */ 154 O|NO, E|NA, E|NA, O|NA, E|NA, O|NA, O|NA, E|NA, /* @ - G */ 155 E|NA, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* H - O */ 156 E|NA, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* P - W */ 157 O|NA, E|NA, E|NA, O|NO, E|NO, O|NO, O|NO, O|NA, /* X - _ */ 158 E|NO, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* ` - g */ 159 O|NA, E|NA, E|NA, O|NA, E|NA, O|NA, O|NA, E|NA, /* h - o */ 160 O|NA, E|NA, E|NA, O|NA, E|NA, O|NA, O|NA, E|NA, /* p - w */ 161 E|NA, O|NA, O|NA, E|NO, O|NO, E|NO, E|NO, O|CC, /* x - del */ 162 /* 163 * Meta chars; should be settable per character set; 164 * for now, treat them all as normal characters. 165 */ 166 NA, NA, NA, NA, NA, NA, NA, NA, 167 NA, NA, NA, NA, NA, NA, NA, NA, 168 NA, NA, NA, NA, NA, NA, NA, NA, 169 NA, NA, NA, NA, NA, NA, NA, NA, 170 NA, NA, NA, NA, NA, NA, NA, NA, 171 NA, NA, NA, NA, NA, NA, NA, NA, 172 NA, NA, NA, NA, NA, NA, NA, NA, 173 NA, NA, NA, NA, NA, NA, NA, NA, 174 NA, NA, NA, NA, NA, NA, NA, NA, 175 NA, NA, NA, NA, NA, NA, NA, NA, 176 NA, NA, NA, NA, NA, NA, NA, NA, 177 NA, NA, NA, NA, NA, NA, NA, NA, 178 NA, NA, NA, NA, NA, NA, NA, NA, 179 NA, NA, NA, NA, NA, NA, NA, NA, 180 NA, NA, NA, NA, NA, NA, NA, NA, 181 NA, NA, NA, NA, NA, NA, NA, NA, 182 }; 183 #undef BS 184 #undef CC 185 #undef CR 186 #undef NA 187 #undef NL 188 #undef NO 189 #undef TB 190 #undef VT 191 192 /* Macros to clear/set/test flags. */ 193 #define SET(t, f) (t) |= (f) 194 #define CLR(t, f) (t) &= ~(f) 195 #define ISSET(t, f) ((t) & (f)) 196 197 #undef MAX_INPUT /* XXX wrong in <sys/syslimits.h> */ 198 #define MAX_INPUT TTYHOG /* XXX limit is usually larger for !ICANON */ 199 200 /* 201 * list of struct tty where pstat(8) can pick it up with sysctl 202 */ 203 static SLIST_HEAD(, tty) tty_list; 204 205 /* 206 * Initial open of tty, or (re)entry to standard tty line discipline. 207 */ 208 int 209 ttyopen(device, tp) 210 dev_t device; 211 struct tty *tp; 212 { 213 int s; 214 215 s = spltty(); 216 tp->t_dev = device; 217 if (!ISSET(tp->t_state, TS_ISOPEN)) { 218 SET(tp->t_state, TS_ISOPEN); 219 if (ISSET(tp->t_cflag, CLOCAL)) 220 SET(tp->t_state, TS_CONNECTED); 221 bzero(&tp->t_winsize, sizeof(tp->t_winsize)); 222 } 223 ttsetwater(tp); 224 splx(s); 225 return (0); 226 } 227 228 /* 229 * Handle close() on a tty line: flush and set to initial state, 230 * bumping generation number so that pending read/write calls 231 * can detect recycling of the tty. 232 * 233 * XXX our caller should have done `spltty(); l_close(); ttyclose();' 234 * and l_close() should have flushed, but we repeat the spltty() and 235 * the flush in case there are buggy callers. 236 */ 237 int 238 ttyclose(tp) 239 struct tty *tp; 240 { 241 int s; 242 243 funsetown(tp->t_sigio); 244 s = spltty(); 245 if (constty == tp) 246 constty = NULL; 247 248 ttyflush(tp, FREAD | FWRITE); 249 clist_free_cblocks(&tp->t_canq); 250 clist_free_cblocks(&tp->t_outq); 251 clist_free_cblocks(&tp->t_rawq); 252 253 tp->t_gen++; 254 tp->t_line = TTYDISC; 255 ttyclearsession(tp); 256 tp->t_state = 0; 257 splx(s); 258 return (0); 259 } 260 261 /* 262 * Disassociate the tty from its session. Traditionally this has only been 263 * a half-close, meaning that the session was still allowed to point at the 264 * tty (resulting in the tty in the ps command showing something like 'p0-'), 265 * even though the tty is no longer pointing at the session. 266 * 267 * The half close seems to be useful only for 'ps' output but there is as 268 * yet no reason to remove the feature. The full-close code is currently 269 * #if 0'd out. See also sess_rele() in kern/kern_proc.c. 270 */ 271 void 272 ttyclearsession(struct tty *tp) 273 { 274 struct session *sp; 275 276 tp->t_pgrp = NULL; 277 if ((sp = tp->t_session) != NULL) { 278 tp->t_session = NULL; 279 #ifdef TTY_DO_FULL_CLOSE 280 /* FULL CLOSE (not yet) */ 281 if (sp->s_ttyp == tp) { 282 sp->s_ttyp = NULL; 283 } else { 284 printf("ttyclearsession: warning: sp->s_ttyp != tp " 285 "%p/%p\n", sp->s_ttyp, tp); 286 } 287 #endif 288 } 289 } 290 291 #define FLUSHQ(q) { \ 292 if ((q)->c_cc) \ 293 ndflush(q, (q)->c_cc); \ 294 } 295 296 /* Is 'c' a line delimiter ("break" character)? */ 297 #define TTBREAKC(c, lflag) \ 298 ((c) == '\n' || (((c) == cc[VEOF] || \ 299 (c) == cc[VEOL] || ((c) == cc[VEOL2] && lflag & IEXTEN)) && \ 300 (c) != _POSIX_VDISABLE)) 301 302 /* 303 * Process input of a single character received on a tty. 304 */ 305 int 306 ttyinput(c, tp) 307 int c; 308 struct tty *tp; 309 { 310 tcflag_t iflag, lflag; 311 cc_t *cc; 312 int i, err; 313 314 /* 315 * If input is pending take it first. 316 */ 317 lflag = tp->t_lflag; 318 if (ISSET(lflag, PENDIN)) 319 ttypend(tp); 320 /* 321 * Gather stats. 322 */ 323 if (ISSET(lflag, ICANON)) { 324 ++tk_cancc; 325 ++tp->t_cancc; 326 } else { 327 ++tk_rawcc; 328 ++tp->t_rawcc; 329 } 330 ++tk_nin; 331 332 /* 333 * Block further input iff: 334 * current input > threshold AND input is available to user program 335 * AND input flow control is enabled and not yet invoked. 336 * The 3 is slop for PARMRK. 337 */ 338 iflag = tp->t_iflag; 339 if (tp->t_rawq.c_cc + tp->t_canq.c_cc > tp->t_ihiwat - 3 && 340 (!ISSET(lflag, ICANON) || tp->t_canq.c_cc != 0) && 341 (ISSET(tp->t_cflag, CRTS_IFLOW) || ISSET(iflag, IXOFF)) && 342 !ISSET(tp->t_state, TS_TBLOCK)) 343 ttyblock(tp); 344 345 /* Handle exceptional conditions (break, parity, framing). */ 346 cc = tp->t_cc; 347 err = (ISSET(c, TTY_ERRORMASK)); 348 if (err) { 349 CLR(c, TTY_ERRORMASK); 350 if (ISSET(err, TTY_BI)) { 351 if (ISSET(iflag, IGNBRK)) 352 return (0); 353 if (ISSET(iflag, BRKINT)) { 354 ttyflush(tp, FREAD | FWRITE); 355 pgsignal(tp->t_pgrp, SIGINT, 1); 356 goto endcase; 357 } 358 if (ISSET(iflag, PARMRK)) 359 goto parmrk; 360 } else if ((ISSET(err, TTY_PE) && ISSET(iflag, INPCK)) 361 || ISSET(err, TTY_FE)) { 362 if (ISSET(iflag, IGNPAR)) 363 return (0); 364 else if (ISSET(iflag, PARMRK)) { 365 parmrk: 366 if (tp->t_rawq.c_cc + tp->t_canq.c_cc > 367 MAX_INPUT - 3) 368 goto input_overflow; 369 (void)putc(0377 | TTY_QUOTE, &tp->t_rawq); 370 (void)putc(0 | TTY_QUOTE, &tp->t_rawq); 371 (void)putc(c | TTY_QUOTE, &tp->t_rawq); 372 goto endcase; 373 } else 374 c = 0; 375 } 376 } 377 378 if (!ISSET(tp->t_state, TS_TYPEN) && ISSET(iflag, ISTRIP)) 379 CLR(c, 0x80); 380 if (!ISSET(lflag, EXTPROC)) { 381 /* 382 * Check for literal nexting very first 383 */ 384 if (ISSET(tp->t_state, TS_LNCH)) { 385 SET(c, TTY_QUOTE); 386 CLR(tp->t_state, TS_LNCH); 387 } 388 /* 389 * Scan for special characters. This code 390 * is really just a big case statement with 391 * non-constant cases. The bottom of the 392 * case statement is labeled ``endcase'', so goto 393 * it after a case match, or similar. 394 */ 395 396 /* 397 * Control chars which aren't controlled 398 * by ICANON, ISIG, or IXON. 399 */ 400 if (ISSET(lflag, IEXTEN)) { 401 if (CCEQ(cc[VLNEXT], c)) { 402 if (ISSET(lflag, ECHO)) { 403 if (ISSET(lflag, ECHOE)) { 404 (void)ttyoutput('^', tp); 405 (void)ttyoutput('\b', tp); 406 } else 407 ttyecho(c, tp); 408 } 409 SET(tp->t_state, TS_LNCH); 410 goto endcase; 411 } 412 if (CCEQ(cc[VDISCARD], c)) { 413 if (ISSET(lflag, FLUSHO)) 414 CLR(tp->t_lflag, FLUSHO); 415 else { 416 ttyflush(tp, FWRITE); 417 ttyecho(c, tp); 418 if (tp->t_rawq.c_cc + tp->t_canq.c_cc) 419 ttyretype(tp); 420 SET(tp->t_lflag, FLUSHO); 421 } 422 goto startoutput; 423 } 424 } 425 /* 426 * Signals. 427 */ 428 if (ISSET(lflag, ISIG)) { 429 if (CCEQ(cc[VINTR], c) || CCEQ(cc[VQUIT], c)) { 430 if (!ISSET(lflag, NOFLSH)) 431 ttyflush(tp, FREAD | FWRITE); 432 ttyecho(c, tp); 433 pgsignal(tp->t_pgrp, 434 CCEQ(cc[VINTR], c) ? SIGINT : SIGQUIT, 1); 435 goto endcase; 436 } 437 if (CCEQ(cc[VSUSP], c)) { 438 if (!ISSET(lflag, NOFLSH)) 439 ttyflush(tp, FREAD); 440 ttyecho(c, tp); 441 pgsignal(tp->t_pgrp, SIGTSTP, 1); 442 goto endcase; 443 } 444 } 445 /* 446 * Handle start/stop characters. 447 */ 448 if (ISSET(iflag, IXON)) { 449 if (CCEQ(cc[VSTOP], c)) { 450 if (!ISSET(tp->t_state, TS_TTSTOP)) { 451 SET(tp->t_state, TS_TTSTOP); 452 (*tp->t_stop)(tp, 0); 453 return (0); 454 } 455 if (!CCEQ(cc[VSTART], c)) 456 return (0); 457 /* 458 * if VSTART == VSTOP then toggle 459 */ 460 goto endcase; 461 } 462 if (CCEQ(cc[VSTART], c)) 463 goto restartoutput; 464 } 465 /* 466 * IGNCR, ICRNL, & INLCR 467 */ 468 if (c == '\r') { 469 if (ISSET(iflag, IGNCR)) 470 return (0); 471 else if (ISSET(iflag, ICRNL)) 472 c = '\n'; 473 } else if (c == '\n' && ISSET(iflag, INLCR)) 474 c = '\r'; 475 } 476 if (!ISSET(tp->t_lflag, EXTPROC) && ISSET(lflag, ICANON)) { 477 /* 478 * From here on down canonical mode character 479 * processing takes place. 480 */ 481 /* 482 * erase or erase2 (^H / ^?) 483 */ 484 if (CCEQ(cc[VERASE], c) || CCEQ(cc[VERASE2], c) ) { 485 if (tp->t_rawq.c_cc) 486 ttyrub(unputc(&tp->t_rawq), tp); 487 goto endcase; 488 } 489 /* 490 * kill (^U) 491 */ 492 if (CCEQ(cc[VKILL], c)) { 493 if (ISSET(lflag, ECHOKE) && 494 tp->t_rawq.c_cc == tp->t_rocount && 495 !ISSET(lflag, ECHOPRT)) 496 while (tp->t_rawq.c_cc) 497 ttyrub(unputc(&tp->t_rawq), tp); 498 else { 499 ttyecho(c, tp); 500 if (ISSET(lflag, ECHOK) || 501 ISSET(lflag, ECHOKE)) 502 ttyecho('\n', tp); 503 FLUSHQ(&tp->t_rawq); 504 tp->t_rocount = 0; 505 } 506 CLR(tp->t_state, TS_LOCAL); 507 goto endcase; 508 } 509 /* 510 * word erase (^W) 511 */ 512 if (CCEQ(cc[VWERASE], c) && ISSET(lflag, IEXTEN)) { 513 int ctype; 514 515 /* 516 * erase whitespace 517 */ 518 while ((c = unputc(&tp->t_rawq)) == ' ' || c == '\t') 519 ttyrub(c, tp); 520 if (c == -1) 521 goto endcase; 522 /* 523 * erase last char of word and remember the 524 * next chars type (for ALTWERASE) 525 */ 526 ttyrub(c, tp); 527 c = unputc(&tp->t_rawq); 528 if (c == -1) 529 goto endcase; 530 if (c == ' ' || c == '\t') { 531 (void)putc(c, &tp->t_rawq); 532 goto endcase; 533 } 534 ctype = ISALPHA(c); 535 /* 536 * erase rest of word 537 */ 538 do { 539 ttyrub(c, tp); 540 c = unputc(&tp->t_rawq); 541 if (c == -1) 542 goto endcase; 543 } while (c != ' ' && c != '\t' && 544 (!ISSET(lflag, ALTWERASE) || ISALPHA(c) == ctype)); 545 (void)putc(c, &tp->t_rawq); 546 goto endcase; 547 } 548 /* 549 * reprint line (^R) 550 */ 551 if (CCEQ(cc[VREPRINT], c) && ISSET(lflag, IEXTEN)) { 552 ttyretype(tp); 553 goto endcase; 554 } 555 /* 556 * ^T - kernel info and generate SIGINFO 557 */ 558 if (CCEQ(cc[VSTATUS], c) && ISSET(lflag, IEXTEN)) { 559 if (ISSET(lflag, ISIG)) 560 pgsignal(tp->t_pgrp, SIGINFO, 1); 561 if (!ISSET(lflag, NOKERNINFO)) 562 ttyinfo(tp); 563 goto endcase; 564 } 565 if (CCEQ(cc[VCHECKPT], c) && ISSET(lflag, IEXTEN)) { 566 if (ISSET(lflag, ISIG)) 567 pgsignal(tp->t_pgrp, SIGCKPT, 1); 568 goto endcase; 569 } 570 } 571 /* 572 * Check for input buffer overflow 573 */ 574 if (tp->t_rawq.c_cc + tp->t_canq.c_cc >= MAX_INPUT) { 575 input_overflow: 576 if (ISSET(iflag, IMAXBEL)) { 577 if (tp->t_outq.c_cc < tp->t_ohiwat) 578 (void)ttyoutput(CTRL('g'), tp); 579 } 580 goto endcase; 581 } 582 583 if ( c == 0377 && ISSET(iflag, PARMRK) && !ISSET(iflag, ISTRIP) 584 && ISSET(iflag, IGNBRK|IGNPAR) != (IGNBRK|IGNPAR)) 585 (void)putc(0377 | TTY_QUOTE, &tp->t_rawq); 586 587 /* 588 * Put data char in q for user and 589 * wakeup on seeing a line delimiter. 590 */ 591 if (putc(c, &tp->t_rawq) >= 0) { 592 if (!ISSET(lflag, ICANON)) { 593 ttwakeup(tp); 594 ttyecho(c, tp); 595 goto endcase; 596 } 597 if (TTBREAKC(c, lflag)) { 598 tp->t_rocount = 0; 599 catq(&tp->t_rawq, &tp->t_canq); 600 ttwakeup(tp); 601 } else if (tp->t_rocount++ == 0) 602 tp->t_rocol = tp->t_column; 603 if (ISSET(tp->t_state, TS_ERASE)) { 604 /* 605 * end of prterase \.../ 606 */ 607 CLR(tp->t_state, TS_ERASE); 608 (void)ttyoutput('/', tp); 609 } 610 i = tp->t_column; 611 ttyecho(c, tp); 612 if (CCEQ(cc[VEOF], c) && ISSET(lflag, ECHO)) { 613 /* 614 * Place the cursor over the '^' of the ^D. 615 */ 616 i = imin(2, tp->t_column - i); 617 while (i > 0) { 618 (void)ttyoutput('\b', tp); 619 i--; 620 } 621 } 622 } 623 endcase: 624 /* 625 * IXANY means allow any character to restart output. 626 */ 627 if (ISSET(tp->t_state, TS_TTSTOP) && 628 !ISSET(iflag, IXANY) && cc[VSTART] != cc[VSTOP]) 629 return (0); 630 restartoutput: 631 CLR(tp->t_lflag, FLUSHO); 632 CLR(tp->t_state, TS_TTSTOP); 633 startoutput: 634 return (ttstart(tp)); 635 } 636 637 /* 638 * Output a single character on a tty, doing output processing 639 * as needed (expanding tabs, newline processing, etc.). 640 * Returns < 0 if succeeds, otherwise returns char to resend. 641 * Must be recursive. 642 */ 643 static int 644 ttyoutput(c, tp) 645 int c; 646 struct tty *tp; 647 { 648 tcflag_t oflag; 649 int col, s; 650 651 oflag = tp->t_oflag; 652 if (!ISSET(oflag, OPOST)) { 653 if (ISSET(tp->t_lflag, FLUSHO)) 654 return (-1); 655 if (putc(c, &tp->t_outq)) 656 return (c); 657 tk_nout++; 658 tp->t_outcc++; 659 return (-1); 660 } 661 /* 662 * Do tab expansion if OXTABS is set. Special case if we external 663 * processing, we don't do the tab expansion because we'll probably 664 * get it wrong. If tab expansion needs to be done, let it happen 665 * externally. 666 */ 667 CLR(c, ~TTY_CHARMASK); 668 if (c == '\t' && 669 ISSET(oflag, OXTABS) && !ISSET(tp->t_lflag, EXTPROC)) { 670 c = 8 - (tp->t_column & 7); 671 if (!ISSET(tp->t_lflag, FLUSHO)) { 672 s = spltty(); /* Don't interrupt tabs. */ 673 c -= b_to_q(" ", c, &tp->t_outq); 674 tk_nout += c; 675 tp->t_outcc += c; 676 splx(s); 677 } 678 tp->t_column += c; 679 return (c ? -1 : '\t'); 680 } 681 if (c == CEOT && ISSET(oflag, ONOEOT)) 682 return (-1); 683 684 /* 685 * Newline translation: if ONLCR is set, 686 * translate newline into "\r\n". 687 */ 688 if (c == '\n' && ISSET(tp->t_oflag, ONLCR)) { 689 tk_nout++; 690 tp->t_outcc++; 691 if (!ISSET(tp->t_lflag, FLUSHO) && putc('\r', &tp->t_outq)) 692 return (c); 693 } 694 /* If OCRNL is set, translate "\r" into "\n". */ 695 else if (c == '\r' && ISSET(tp->t_oflag, OCRNL)) 696 c = '\n'; 697 /* If ONOCR is set, don't transmit CRs when on column 0. */ 698 else if (c == '\r' && ISSET(tp->t_oflag, ONOCR) && tp->t_column == 0) 699 return (-1); 700 701 tk_nout++; 702 tp->t_outcc++; 703 if (!ISSET(tp->t_lflag, FLUSHO) && putc(c, &tp->t_outq)) 704 return (c); 705 706 col = tp->t_column; 707 switch (CCLASS(c)) { 708 case BACKSPACE: 709 if (col > 0) 710 --col; 711 break; 712 case CONTROL: 713 break; 714 case NEWLINE: 715 if (ISSET(tp->t_oflag, ONLCR | ONLRET)) 716 col = 0; 717 break; 718 case RETURN: 719 col = 0; 720 break; 721 case ORDINARY: 722 ++col; 723 break; 724 case TAB: 725 col = (col + 8) & ~7; 726 break; 727 } 728 tp->t_column = col; 729 return (-1); 730 } 731 732 /* 733 * Ioctls for all tty devices. Called after line-discipline specific ioctl 734 * has been called to do discipline-specific functions and/or reject any 735 * of these ioctl commands. 736 */ 737 /* ARGSUSED */ 738 int 739 ttioctl(struct tty *tp, u_long cmd, void *data, int flag) 740 { 741 struct thread *td = curthread; 742 struct proc *p = td->td_proc; 743 int s, error; 744 745 KKASSERT(p); 746 747 /* If the ioctl involves modification, hang if in the background. */ 748 switch (cmd) { 749 case TIOCCBRK: 750 case TIOCCONS: 751 case TIOCDRAIN: 752 case TIOCEXCL: 753 case TIOCFLUSH: 754 #ifdef TIOCHPCL 755 case TIOCHPCL: 756 #endif 757 case TIOCNXCL: 758 case TIOCSBRK: 759 case TIOCSCTTY: 760 case TIOCSDRAINWAIT: 761 case TIOCSETA: 762 case TIOCSETAF: 763 case TIOCSETAW: 764 case TIOCSETD: 765 case TIOCSPGRP: 766 case TIOCSTART: 767 case TIOCSTAT: 768 case TIOCSTI: 769 case TIOCSTOP: 770 case TIOCSWINSZ: 771 #if defined(COMPAT_43) || defined(COMPAT_SUNOS) 772 case TIOCLBIC: 773 case TIOCLBIS: 774 case TIOCLSET: 775 case TIOCSETC: 776 case OTIOCSETD: 777 case TIOCSETN: 778 case TIOCSETP: 779 case TIOCSLTC: 780 #endif 781 while (isbackground(p, tp) && !(p->p_flag & P_PPWAIT) && 782 !SIGISMEMBER(p->p_sigignore, SIGTTOU) && 783 !SIGISMEMBER(p->p_sigmask, SIGTTOU)) { 784 if (p->p_pgrp->pg_jobc == 0) 785 return (EIO); 786 pgsignal(p->p_pgrp, SIGTTOU, 1); 787 error = ttysleep(tp, &lbolt, PCATCH, "ttybg1", 788 0); 789 if (error) 790 return (error); 791 } 792 break; 793 } 794 795 switch (cmd) { /* Process the ioctl. */ 796 case FIOASYNC: /* set/clear async i/o */ 797 s = spltty(); 798 if (*(int *)data) 799 SET(tp->t_state, TS_ASYNC); 800 else 801 CLR(tp->t_state, TS_ASYNC); 802 splx(s); 803 break; 804 case FIONBIO: /* set/clear non-blocking i/o */ 805 break; /* XXX: delete. */ 806 case FIONREAD: /* get # bytes to read */ 807 s = spltty(); 808 *(int *)data = ttnread(tp); 809 splx(s); 810 break; 811 812 case FIOSETOWN: 813 /* 814 * Policy -- Don't allow FIOSETOWN on someone else's 815 * controlling tty 816 */ 817 if (tp->t_session != NULL && !isctty(p, tp)) 818 return (ENOTTY); 819 820 error = fsetown(*(int *)data, &tp->t_sigio); 821 if (error) 822 return (error); 823 break; 824 case FIOGETOWN: 825 if (tp->t_session != NULL && !isctty(p, tp)) 826 return (ENOTTY); 827 *(int *)data = fgetown(tp->t_sigio); 828 break; 829 830 case TIOCEXCL: /* set exclusive use of tty */ 831 s = spltty(); 832 SET(tp->t_state, TS_XCLUDE); 833 splx(s); 834 break; 835 case TIOCFLUSH: { /* flush buffers */ 836 int flags = *(int *)data; 837 838 if (flags == 0) 839 flags = FREAD | FWRITE; 840 else 841 flags &= FREAD | FWRITE; 842 ttyflush(tp, flags); 843 break; 844 } 845 case TIOCCONS: /* become virtual console */ 846 if (*(int *)data) { 847 if (constty && constty != tp && 848 ISSET(constty->t_state, TS_CONNECTED)) 849 return (EBUSY); 850 #ifndef UCONSOLE 851 if ((error = suser(td)) != 0) 852 return (error); 853 #endif 854 constty = tp; 855 } else if (tp == constty) 856 constty = NULL; 857 break; 858 case TIOCDRAIN: /* wait till output drained */ 859 error = ttywait(tp); 860 if (error) 861 return (error); 862 break; 863 case TIOCGETA: { /* get termios struct */ 864 struct termios *t = (struct termios *)data; 865 866 bcopy(&tp->t_termios, t, sizeof(struct termios)); 867 break; 868 } 869 case TIOCGETD: /* get line discipline */ 870 *(int *)data = tp->t_line; 871 break; 872 case TIOCGWINSZ: /* get window size */ 873 *(struct winsize *)data = tp->t_winsize; 874 break; 875 case TIOCGPGRP: /* get pgrp of tty */ 876 if (!isctty(p, tp)) 877 return (ENOTTY); 878 *(int *)data = tp->t_pgrp ? tp->t_pgrp->pg_id : NO_PID; 879 break; 880 #ifdef TIOCHPCL 881 case TIOCHPCL: /* hang up on last close */ 882 s = spltty(); 883 SET(tp->t_cflag, HUPCL); 884 splx(s); 885 break; 886 #endif 887 case TIOCNXCL: /* reset exclusive use of tty */ 888 s = spltty(); 889 CLR(tp->t_state, TS_XCLUDE); 890 splx(s); 891 break; 892 case TIOCOUTQ: /* output queue size */ 893 *(int *)data = tp->t_outq.c_cc; 894 break; 895 case TIOCSETA: /* set termios struct */ 896 case TIOCSETAW: /* drain output, set */ 897 case TIOCSETAF: { /* drn out, fls in, set */ 898 struct termios *t = (struct termios *)data; 899 900 if (t->c_ispeed == 0) 901 t->c_ispeed = t->c_ospeed; 902 if (t->c_ispeed == 0) 903 t->c_ispeed = tp->t_ospeed; 904 if (t->c_ispeed == 0) 905 return (EINVAL); 906 s = spltty(); 907 if (cmd == TIOCSETAW || cmd == TIOCSETAF) { 908 error = ttywait(tp); 909 if (error) { 910 splx(s); 911 return (error); 912 } 913 if (cmd == TIOCSETAF) 914 ttyflush(tp, FREAD); 915 } 916 if (!ISSET(t->c_cflag, CIGNORE)) { 917 /* 918 * Set device hardware. 919 */ 920 if (tp->t_param && (error = (*tp->t_param)(tp, t))) { 921 splx(s); 922 return (error); 923 } 924 if (ISSET(t->c_cflag, CLOCAL) && 925 !ISSET(tp->t_cflag, CLOCAL)) { 926 /* 927 * XXX disconnections would be too hard to 928 * get rid of without this kludge. The only 929 * way to get rid of controlling terminals 930 * is to exit from the session leader. 931 */ 932 CLR(tp->t_state, TS_ZOMBIE); 933 934 wakeup(TSA_CARR_ON(tp)); 935 ttwakeup(tp); 936 ttwwakeup(tp); 937 } 938 if ((ISSET(tp->t_state, TS_CARR_ON) || 939 ISSET(t->c_cflag, CLOCAL)) && 940 !ISSET(tp->t_state, TS_ZOMBIE)) 941 SET(tp->t_state, TS_CONNECTED); 942 else 943 CLR(tp->t_state, TS_CONNECTED); 944 tp->t_cflag = t->c_cflag; 945 tp->t_ispeed = t->c_ispeed; 946 if (t->c_ospeed != 0) 947 tp->t_ospeed = t->c_ospeed; 948 ttsetwater(tp); 949 } 950 if (ISSET(t->c_lflag, ICANON) != ISSET(tp->t_lflag, ICANON) && 951 cmd != TIOCSETAF) { 952 if (ISSET(t->c_lflag, ICANON)) 953 SET(tp->t_lflag, PENDIN); 954 else { 955 /* 956 * XXX we really shouldn't allow toggling 957 * ICANON while we're in a non-termios line 958 * discipline. Now we have to worry about 959 * panicing for a null queue. 960 */ 961 if (tp->t_canq.c_cbreserved > 0 && 962 tp->t_rawq.c_cbreserved > 0) { 963 catq(&tp->t_rawq, &tp->t_canq); 964 /* 965 * XXX the queue limits may be 966 * different, so the old queue 967 * swapping method no longer works. 968 */ 969 catq(&tp->t_canq, &tp->t_rawq); 970 } 971 CLR(tp->t_lflag, PENDIN); 972 } 973 ttwakeup(tp); 974 } 975 tp->t_iflag = t->c_iflag; 976 tp->t_oflag = t->c_oflag; 977 /* 978 * Make the EXTPROC bit read only. 979 */ 980 if (ISSET(tp->t_lflag, EXTPROC)) 981 SET(t->c_lflag, EXTPROC); 982 else 983 CLR(t->c_lflag, EXTPROC); 984 tp->t_lflag = t->c_lflag | ISSET(tp->t_lflag, PENDIN); 985 if (t->c_cc[VMIN] != tp->t_cc[VMIN] || 986 t->c_cc[VTIME] != tp->t_cc[VTIME]) 987 ttwakeup(tp); 988 bcopy(t->c_cc, tp->t_cc, sizeof(t->c_cc)); 989 splx(s); 990 break; 991 } 992 case TIOCSETD: { /* set line discipline */ 993 int t = *(int *)data; 994 dev_t device = tp->t_dev; 995 996 if ((u_int)t >= nlinesw) 997 return (ENXIO); 998 if (t != tp->t_line) { 999 s = spltty(); 1000 (*linesw[tp->t_line].l_close)(tp, flag); 1001 error = (*linesw[t].l_open)(device, tp); 1002 if (error) { 1003 (void)(*linesw[tp->t_line].l_open)(device, tp); 1004 splx(s); 1005 return (error); 1006 } 1007 tp->t_line = t; 1008 splx(s); 1009 } 1010 break; 1011 } 1012 case TIOCSTART: /* start output, like ^Q */ 1013 s = spltty(); 1014 if (ISSET(tp->t_state, TS_TTSTOP) || 1015 ISSET(tp->t_lflag, FLUSHO)) { 1016 CLR(tp->t_lflag, FLUSHO); 1017 CLR(tp->t_state, TS_TTSTOP); 1018 ttstart(tp); 1019 } 1020 splx(s); 1021 break; 1022 case TIOCSTI: /* simulate terminal input */ 1023 if ((flag & FREAD) == 0 && suser(td)) 1024 return (EPERM); 1025 if (!isctty(p, tp) && suser(td)) 1026 return (EACCES); 1027 s = spltty(); 1028 (*linesw[tp->t_line].l_rint)(*(u_char *)data, tp); 1029 splx(s); 1030 break; 1031 case TIOCSTOP: /* stop output, like ^S */ 1032 s = spltty(); 1033 if (!ISSET(tp->t_state, TS_TTSTOP)) { 1034 SET(tp->t_state, TS_TTSTOP); 1035 (*tp->t_stop)(tp, 0); 1036 } 1037 splx(s); 1038 break; 1039 case TIOCSCTTY: /* become controlling tty */ 1040 /* Session ctty vnode pointer set in vnode layer. */ 1041 if (!SESS_LEADER(p) || 1042 ((p->p_session->s_ttyvp || tp->t_session) && 1043 (tp->t_session != p->p_session))) 1044 return (EPERM); 1045 tp->t_session = p->p_session; 1046 tp->t_pgrp = p->p_pgrp; 1047 p->p_session->s_ttyp = tp; 1048 p->p_flag |= P_CONTROLT; 1049 break; 1050 case TIOCSPGRP: { /* set pgrp of tty */ 1051 struct pgrp *pgrp = pgfind(*(int *)data); 1052 1053 if (!isctty(p, tp)) 1054 return (ENOTTY); 1055 else if (pgrp == NULL || pgrp->pg_session != p->p_session) 1056 return (EPERM); 1057 tp->t_pgrp = pgrp; 1058 break; 1059 } 1060 case TIOCSTAT: /* simulate control-T */ 1061 s = spltty(); 1062 ttyinfo(tp); 1063 splx(s); 1064 break; 1065 case TIOCSWINSZ: /* set window size */ 1066 if (bcmp((caddr_t)&tp->t_winsize, data, 1067 sizeof (struct winsize))) { 1068 tp->t_winsize = *(struct winsize *)data; 1069 pgsignal(tp->t_pgrp, SIGWINCH, 1); 1070 } 1071 break; 1072 case TIOCSDRAINWAIT: 1073 error = suser(td); 1074 if (error) 1075 return (error); 1076 tp->t_timeout = *(int *)data * hz; 1077 wakeup(TSA_OCOMPLETE(tp)); 1078 wakeup(TSA_OLOWAT(tp)); 1079 break; 1080 case TIOCGDRAINWAIT: 1081 *(int *)data = tp->t_timeout / hz; 1082 break; 1083 default: 1084 #if defined(COMPAT_43) || defined(COMPAT_SUNOS) 1085 return (ttcompat(tp, cmd, data, flag)); 1086 #else 1087 return (ENOIOCTL); 1088 #endif 1089 } 1090 return (0); 1091 } 1092 1093 int 1094 ttypoll(dev, events, td) 1095 dev_t dev; 1096 int events; 1097 struct thread *td; 1098 { 1099 int s; 1100 int revents = 0; 1101 struct tty *tp; 1102 1103 tp = dev->si_tty; 1104 if (tp == NULL) /* XXX used to return ENXIO, but that means true! */ 1105 return ((events & (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM)) 1106 | POLLHUP); 1107 1108 s = spltty(); 1109 if (events & (POLLIN | POLLRDNORM)) { 1110 if (ttnread(tp) > 0 || ISSET(tp->t_state, TS_ZOMBIE)) 1111 revents |= events & (POLLIN | POLLRDNORM); 1112 else 1113 selrecord(td, &tp->t_rsel); 1114 } 1115 if (events & (POLLOUT | POLLWRNORM)) { 1116 if ((tp->t_outq.c_cc <= tp->t_olowat && 1117 ISSET(tp->t_state, TS_CONNECTED)) 1118 || ISSET(tp->t_state, TS_ZOMBIE)) 1119 revents |= events & (POLLOUT | POLLWRNORM); 1120 else 1121 selrecord(td, &tp->t_wsel); 1122 } 1123 splx(s); 1124 return (revents); 1125 } 1126 1127 static struct filterops ttyread_filtops = 1128 { 1, NULL, filt_ttyrdetach, filt_ttyread }; 1129 static struct filterops ttywrite_filtops = 1130 { 1, NULL, filt_ttywdetach, filt_ttywrite }; 1131 1132 int 1133 ttykqfilter(dev, kn) 1134 dev_t dev; 1135 struct knote *kn; 1136 { 1137 struct tty *tp = dev->si_tty; 1138 struct klist *klist; 1139 int s; 1140 1141 switch (kn->kn_filter) { 1142 case EVFILT_READ: 1143 klist = &tp->t_rsel.si_note; 1144 kn->kn_fop = &ttyread_filtops; 1145 break; 1146 case EVFILT_WRITE: 1147 klist = &tp->t_wsel.si_note; 1148 kn->kn_fop = &ttywrite_filtops; 1149 break; 1150 default: 1151 return (1); 1152 } 1153 1154 kn->kn_hook = (caddr_t)dev; 1155 1156 s = spltty(); 1157 SLIST_INSERT_HEAD(klist, kn, kn_selnext); 1158 splx(s); 1159 1160 return (0); 1161 } 1162 1163 static void 1164 filt_ttyrdetach(struct knote *kn) 1165 { 1166 struct tty *tp = ((dev_t)kn->kn_hook)->si_tty; 1167 int s = spltty(); 1168 1169 SLIST_REMOVE(&tp->t_rsel.si_note, kn, knote, kn_selnext); 1170 splx(s); 1171 } 1172 1173 static int 1174 filt_ttyread(struct knote *kn, long hint) 1175 { 1176 struct tty *tp = ((dev_t)kn->kn_hook)->si_tty; 1177 1178 kn->kn_data = ttnread(tp); 1179 if (ISSET(tp->t_state, TS_ZOMBIE)) { 1180 kn->kn_flags |= EV_EOF; 1181 return (1); 1182 } 1183 return (kn->kn_data > 0); 1184 } 1185 1186 static void 1187 filt_ttywdetach(struct knote *kn) 1188 { 1189 struct tty *tp = ((dev_t)kn->kn_hook)->si_tty; 1190 int s = spltty(); 1191 1192 SLIST_REMOVE(&tp->t_wsel.si_note, kn, knote, kn_selnext); 1193 splx(s); 1194 } 1195 1196 static int 1197 filt_ttywrite(kn, hint) 1198 struct knote *kn; 1199 long hint; 1200 { 1201 struct tty *tp = ((dev_t)kn->kn_hook)->si_tty; 1202 1203 kn->kn_data = tp->t_outq.c_cc; 1204 if (ISSET(tp->t_state, TS_ZOMBIE)) 1205 return (1); 1206 return (kn->kn_data <= tp->t_olowat && 1207 ISSET(tp->t_state, TS_CONNECTED)); 1208 } 1209 1210 /* 1211 * Must be called at spltty(). 1212 */ 1213 static int 1214 ttnread(tp) 1215 struct tty *tp; 1216 { 1217 int nread; 1218 1219 if (ISSET(tp->t_lflag, PENDIN)) 1220 ttypend(tp); 1221 nread = tp->t_canq.c_cc; 1222 if (!ISSET(tp->t_lflag, ICANON)) { 1223 nread += tp->t_rawq.c_cc; 1224 if (nread < tp->t_cc[VMIN] && tp->t_cc[VTIME] == 0) 1225 nread = 0; 1226 } 1227 return (nread); 1228 } 1229 1230 /* 1231 * Wait for output to drain. 1232 */ 1233 int 1234 ttywait(tp) 1235 struct tty *tp; 1236 { 1237 int error, s; 1238 1239 error = 0; 1240 s = spltty(); 1241 while ((tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY)) && 1242 ISSET(tp->t_state, TS_CONNECTED) && tp->t_oproc) { 1243 (*tp->t_oproc)(tp); 1244 if ((tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY)) && 1245 ISSET(tp->t_state, TS_CONNECTED)) { 1246 SET(tp->t_state, TS_SO_OCOMPLETE); 1247 error = ttysleep(tp, TSA_OCOMPLETE(tp), 1248 PCATCH, "ttywai", 1249 tp->t_timeout); 1250 if (error) { 1251 if (error == EWOULDBLOCK) 1252 error = EIO; 1253 break; 1254 } 1255 } else 1256 break; 1257 } 1258 if (!error && (tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY))) 1259 error = EIO; 1260 splx(s); 1261 return (error); 1262 } 1263 1264 /* 1265 * Flush if successfully wait. 1266 */ 1267 static int 1268 ttywflush(tp) 1269 struct tty *tp; 1270 { 1271 int error; 1272 1273 if ((error = ttywait(tp)) == 0) 1274 ttyflush(tp, FREAD); 1275 return (error); 1276 } 1277 1278 /* 1279 * Flush tty read and/or write queues, notifying anyone waiting. 1280 */ 1281 void 1282 ttyflush(tp, rw) 1283 struct tty *tp; 1284 int rw; 1285 { 1286 int s; 1287 1288 s = spltty(); 1289 #if 0 1290 again: 1291 #endif 1292 if (rw & FWRITE) { 1293 FLUSHQ(&tp->t_outq); 1294 CLR(tp->t_state, TS_TTSTOP); 1295 } 1296 (*tp->t_stop)(tp, rw); 1297 if (rw & FREAD) { 1298 FLUSHQ(&tp->t_canq); 1299 FLUSHQ(&tp->t_rawq); 1300 CLR(tp->t_lflag, PENDIN); 1301 tp->t_rocount = 0; 1302 tp->t_rocol = 0; 1303 CLR(tp->t_state, TS_LOCAL); 1304 ttwakeup(tp); 1305 if (ISSET(tp->t_state, TS_TBLOCK)) { 1306 if (rw & FWRITE) 1307 FLUSHQ(&tp->t_outq); 1308 ttyunblock(tp); 1309 1310 /* 1311 * Don't let leave any state that might clobber the 1312 * next line discipline (although we should do more 1313 * to send the START char). Not clearing the state 1314 * may have caused the "putc to a clist with no 1315 * reserved cblocks" panic/printf. 1316 */ 1317 CLR(tp->t_state, TS_TBLOCK); 1318 1319 #if 0 /* forget it, sleeping isn't always safe and we don't know when it is */ 1320 if (ISSET(tp->t_iflag, IXOFF)) { 1321 /* 1322 * XXX wait a bit in the hope that the stop 1323 * character (if any) will go out. Waiting 1324 * isn't good since it allows races. This 1325 * will be fixed when the stop character is 1326 * put in a special queue. Don't bother with 1327 * the checks in ttywait() since the timeout 1328 * will save us. 1329 */ 1330 SET(tp->t_state, TS_SO_OCOMPLETE); 1331 ttysleep(tp, TSA_OCOMPLETE(tp), 0, 1332 "ttyfls", hz / 10); 1333 /* 1334 * Don't try sending the stop character again. 1335 */ 1336 CLR(tp->t_state, TS_TBLOCK); 1337 goto again; 1338 } 1339 #endif 1340 } 1341 } 1342 if (rw & FWRITE) { 1343 FLUSHQ(&tp->t_outq); 1344 ttwwakeup(tp); 1345 } 1346 splx(s); 1347 } 1348 1349 /* 1350 * Copy in the default termios characters. 1351 */ 1352 void 1353 termioschars(t) 1354 struct termios *t; 1355 { 1356 1357 bcopy(ttydefchars, t->c_cc, sizeof t->c_cc); 1358 } 1359 1360 /* 1361 * Old interface. 1362 */ 1363 void 1364 ttychars(tp) 1365 struct tty *tp; 1366 { 1367 1368 termioschars(&tp->t_termios); 1369 } 1370 1371 /* 1372 * Handle input high water. Send stop character for the IXOFF case. Turn 1373 * on our input flow control bit and propagate the changes to the driver. 1374 * XXX the stop character should be put in a special high priority queue. 1375 */ 1376 void 1377 ttyblock(tp) 1378 struct tty *tp; 1379 { 1380 1381 SET(tp->t_state, TS_TBLOCK); 1382 if (ISSET(tp->t_iflag, IXOFF) && tp->t_cc[VSTOP] != _POSIX_VDISABLE && 1383 putc(tp->t_cc[VSTOP], &tp->t_outq) != 0) 1384 CLR(tp->t_state, TS_TBLOCK); /* try again later */ 1385 ttstart(tp); 1386 } 1387 1388 /* 1389 * Handle input low water. Send start character for the IXOFF case. Turn 1390 * off our input flow control bit and propagate the changes to the driver. 1391 * XXX the start character should be put in a special high priority queue. 1392 */ 1393 static void 1394 ttyunblock(tp) 1395 struct tty *tp; 1396 { 1397 1398 CLR(tp->t_state, TS_TBLOCK); 1399 if (ISSET(tp->t_iflag, IXOFF) && tp->t_cc[VSTART] != _POSIX_VDISABLE && 1400 putc(tp->t_cc[VSTART], &tp->t_outq) != 0) 1401 SET(tp->t_state, TS_TBLOCK); /* try again later */ 1402 ttstart(tp); 1403 } 1404 1405 #ifdef notyet 1406 /* Not used by any current (i386) drivers. */ 1407 /* 1408 * Restart after an inter-char delay. 1409 */ 1410 void 1411 ttrstrt(tp_arg) 1412 void *tp_arg; 1413 { 1414 struct tty *tp; 1415 int s; 1416 1417 KASSERT(tp_arg != NULL, ("ttrstrt")); 1418 1419 tp = tp_arg; 1420 s = spltty(); 1421 1422 CLR(tp->t_state, TS_TIMEOUT); 1423 ttstart(tp); 1424 1425 splx(s); 1426 } 1427 #endif 1428 1429 int 1430 ttstart(tp) 1431 struct tty *tp; 1432 { 1433 1434 if (tp->t_oproc != NULL) /* XXX: Kludge for pty. */ 1435 (*tp->t_oproc)(tp); 1436 return (0); 1437 } 1438 1439 /* 1440 * "close" a line discipline 1441 */ 1442 int 1443 ttylclose(tp, flag) 1444 struct tty *tp; 1445 int flag; 1446 { 1447 1448 if (flag & FNONBLOCK || ttywflush(tp)) 1449 ttyflush(tp, FREAD | FWRITE); 1450 return (0); 1451 } 1452 1453 /* 1454 * Handle modem control transition on a tty. 1455 * Flag indicates new state of carrier. 1456 * Returns 0 if the line should be turned off, otherwise 1. 1457 */ 1458 int 1459 ttymodem(tp, flag) 1460 struct tty *tp; 1461 int flag; 1462 { 1463 1464 if (ISSET(tp->t_state, TS_CARR_ON) && ISSET(tp->t_cflag, MDMBUF)) { 1465 /* 1466 * MDMBUF: do flow control according to carrier flag 1467 * XXX TS_CAR_OFLOW doesn't do anything yet. TS_TTSTOP 1468 * works if IXON and IXANY are clear. 1469 */ 1470 if (flag) { 1471 CLR(tp->t_state, TS_CAR_OFLOW); 1472 CLR(tp->t_state, TS_TTSTOP); 1473 ttstart(tp); 1474 } else if (!ISSET(tp->t_state, TS_CAR_OFLOW)) { 1475 SET(tp->t_state, TS_CAR_OFLOW); 1476 SET(tp->t_state, TS_TTSTOP); 1477 (*tp->t_stop)(tp, 0); 1478 } 1479 } else if (flag == 0) { 1480 /* 1481 * Lost carrier. 1482 */ 1483 CLR(tp->t_state, TS_CARR_ON); 1484 if (ISSET(tp->t_state, TS_ISOPEN) && 1485 !ISSET(tp->t_cflag, CLOCAL)) { 1486 SET(tp->t_state, TS_ZOMBIE); 1487 CLR(tp->t_state, TS_CONNECTED); 1488 if (tp->t_session && tp->t_session->s_leader) 1489 psignal(tp->t_session->s_leader, SIGHUP); 1490 ttyflush(tp, FREAD | FWRITE); 1491 return (0); 1492 } 1493 } else { 1494 /* 1495 * Carrier now on. 1496 */ 1497 SET(tp->t_state, TS_CARR_ON); 1498 if (!ISSET(tp->t_state, TS_ZOMBIE)) 1499 SET(tp->t_state, TS_CONNECTED); 1500 wakeup(TSA_CARR_ON(tp)); 1501 ttwakeup(tp); 1502 ttwwakeup(tp); 1503 } 1504 return (1); 1505 } 1506 1507 /* 1508 * Reinput pending characters after state switch 1509 * call at spltty(). 1510 */ 1511 static void 1512 ttypend(tp) 1513 struct tty *tp; 1514 { 1515 struct clist tq; 1516 int c; 1517 1518 CLR(tp->t_lflag, PENDIN); 1519 SET(tp->t_state, TS_TYPEN); 1520 /* 1521 * XXX this assumes too much about clist internals. It may even 1522 * fail if the cblock slush pool is empty. We can't allocate more 1523 * cblocks here because we are called from an interrupt handler 1524 * and clist_alloc_cblocks() can wait. 1525 */ 1526 tq = tp->t_rawq; 1527 bzero(&tp->t_rawq, sizeof tp->t_rawq); 1528 tp->t_rawq.c_cbmax = tq.c_cbmax; 1529 tp->t_rawq.c_cbreserved = tq.c_cbreserved; 1530 while ((c = getc(&tq)) >= 0) 1531 ttyinput(c, tp); 1532 CLR(tp->t_state, TS_TYPEN); 1533 } 1534 1535 /* 1536 * Process a read call on a tty device. 1537 */ 1538 int 1539 ttread(tp, uio, flag) 1540 struct tty *tp; 1541 struct uio *uio; 1542 int flag; 1543 { 1544 struct clist *qp; 1545 int c; 1546 tcflag_t lflag; 1547 cc_t *cc = tp->t_cc; 1548 struct proc *p = curproc; 1549 int s, first, error = 0; 1550 int has_stime = 0, last_cc = 0; 1551 long slp = 0; /* XXX this should be renamed `timo'. */ 1552 struct timeval stime; 1553 1554 loop: 1555 s = spltty(); 1556 lflag = tp->t_lflag; 1557 /* 1558 * take pending input first 1559 */ 1560 if (ISSET(lflag, PENDIN)) { 1561 ttypend(tp); 1562 splx(s); /* reduce latency */ 1563 s = spltty(); 1564 lflag = tp->t_lflag; /* XXX ttypend() clobbers it */ 1565 } 1566 1567 /* 1568 * Hang process if it's in the background. 1569 */ 1570 if (isbackground(p, tp)) { 1571 splx(s); 1572 if (SIGISMEMBER(p->p_sigignore, SIGTTIN) || 1573 SIGISMEMBER(p->p_sigmask, SIGTTIN) || 1574 (p->p_flag & P_PPWAIT) || p->p_pgrp->pg_jobc == 0) 1575 return (EIO); 1576 pgsignal(p->p_pgrp, SIGTTIN, 1); 1577 error = ttysleep(tp, &lbolt, PCATCH, "ttybg2", 0); 1578 if (error) 1579 return (error); 1580 goto loop; 1581 } 1582 1583 if (ISSET(tp->t_state, TS_ZOMBIE)) { 1584 splx(s); 1585 return (0); /* EOF */ 1586 } 1587 1588 /* 1589 * If canonical, use the canonical queue, 1590 * else use the raw queue. 1591 * 1592 * (should get rid of clists...) 1593 */ 1594 qp = ISSET(lflag, ICANON) ? &tp->t_canq : &tp->t_rawq; 1595 1596 if (flag & IO_NDELAY) { 1597 if (qp->c_cc > 0) 1598 goto read; 1599 if (!ISSET(lflag, ICANON) && cc[VMIN] == 0) { 1600 splx(s); 1601 return (0); 1602 } 1603 splx(s); 1604 return (EWOULDBLOCK); 1605 } 1606 if (!ISSET(lflag, ICANON)) { 1607 int m = cc[VMIN]; 1608 long t = cc[VTIME]; 1609 struct timeval timecopy; 1610 1611 /* 1612 * Check each of the four combinations. 1613 * (m > 0 && t == 0) is the normal read case. 1614 * It should be fairly efficient, so we check that and its 1615 * companion case (m == 0 && t == 0) first. 1616 * For the other two cases, we compute the target sleep time 1617 * into slp. 1618 */ 1619 if (t == 0) { 1620 if (qp->c_cc < m) 1621 goto sleep; 1622 if (qp->c_cc > 0) 1623 goto read; 1624 1625 /* m, t and qp->c_cc are all 0. 0 is enough input. */ 1626 splx(s); 1627 return (0); 1628 } 1629 t *= 100000; /* time in us */ 1630 #define diff(t1, t2) (((t1).tv_sec - (t2).tv_sec) * 1000000 + \ 1631 ((t1).tv_usec - (t2).tv_usec)) 1632 if (m > 0) { 1633 if (qp->c_cc <= 0) 1634 goto sleep; 1635 if (qp->c_cc >= m) 1636 goto read; 1637 getmicrotime(&timecopy); 1638 if (!has_stime) { 1639 /* first character, start timer */ 1640 has_stime = 1; 1641 stime = timecopy; 1642 slp = t; 1643 } else if (qp->c_cc > last_cc) { 1644 /* got a character, restart timer */ 1645 stime = timecopy; 1646 slp = t; 1647 } else { 1648 /* nothing, check expiration */ 1649 slp = t - diff(timecopy, stime); 1650 if (slp <= 0) 1651 goto read; 1652 } 1653 last_cc = qp->c_cc; 1654 } else { /* m == 0 */ 1655 if (qp->c_cc > 0) 1656 goto read; 1657 getmicrotime(&timecopy); 1658 if (!has_stime) { 1659 has_stime = 1; 1660 stime = timecopy; 1661 slp = t; 1662 } else { 1663 slp = t - diff(timecopy, stime); 1664 if (slp <= 0) { 1665 /* Timed out, but 0 is enough input. */ 1666 splx(s); 1667 return (0); 1668 } 1669 } 1670 } 1671 #undef diff 1672 /* 1673 * Rounding down may make us wake up just short 1674 * of the target, so we round up. 1675 * The formula is ceiling(slp * hz/1000000). 1676 * 32-bit arithmetic is enough for hz < 169. 1677 * XXX see tvtohz() for how to avoid overflow if hz 1678 * is large (divide by `tick' and/or arrange to 1679 * use tvtohz() if hz is large). 1680 */ 1681 slp = (long) (((u_long)slp * hz) + 999999) / 1000000; 1682 goto sleep; 1683 } 1684 if (qp->c_cc <= 0) { 1685 sleep: 1686 /* 1687 * There is no input, or not enough input and we can block. 1688 */ 1689 error = ttysleep(tp, TSA_HUP_OR_INPUT(tp), PCATCH, 1690 ISSET(tp->t_state, TS_CONNECTED) ? 1691 "ttyin" : "ttyhup", (int)slp); 1692 splx(s); 1693 if (error == EWOULDBLOCK) 1694 error = 0; 1695 else if (error) 1696 return (error); 1697 /* 1698 * XXX what happens if another process eats some input 1699 * while we are asleep (not just here)? It would be 1700 * safest to detect changes and reset our state variables 1701 * (has_stime and last_cc). 1702 */ 1703 slp = 0; 1704 goto loop; 1705 } 1706 read: 1707 splx(s); 1708 /* 1709 * Input present, check for input mapping and processing. 1710 */ 1711 first = 1; 1712 if (ISSET(lflag, ICANON | ISIG)) 1713 goto slowcase; 1714 for (;;) { 1715 char ibuf[IBUFSIZ]; 1716 int icc; 1717 1718 icc = imin(uio->uio_resid, IBUFSIZ); 1719 icc = q_to_b(qp, ibuf, icc); 1720 if (icc <= 0) { 1721 if (first) 1722 goto loop; 1723 break; 1724 } 1725 error = uiomove(ibuf, icc, uio); 1726 /* 1727 * XXX if there was an error then we should ungetc() the 1728 * unmoved chars and reduce icc here. 1729 */ 1730 if (error) 1731 break; 1732 if (uio->uio_resid == 0) 1733 break; 1734 first = 0; 1735 } 1736 goto out; 1737 slowcase: 1738 for (;;) { 1739 c = getc(qp); 1740 if (c < 0) { 1741 if (first) 1742 goto loop; 1743 break; 1744 } 1745 /* 1746 * delayed suspend (^Y) 1747 */ 1748 if (CCEQ(cc[VDSUSP], c) && 1749 ISSET(lflag, IEXTEN | ISIG) == (IEXTEN | ISIG)) { 1750 pgsignal(tp->t_pgrp, SIGTSTP, 1); 1751 if (first) { 1752 error = ttysleep(tp, &lbolt, PCATCH, 1753 "ttybg3", 0); 1754 if (error) 1755 break; 1756 goto loop; 1757 } 1758 break; 1759 } 1760 /* 1761 * Interpret EOF only in canonical mode. 1762 */ 1763 if (CCEQ(cc[VEOF], c) && ISSET(lflag, ICANON)) 1764 break; 1765 /* 1766 * Give user character. 1767 */ 1768 error = ureadc(c, uio); 1769 if (error) 1770 /* XXX should ungetc(c, qp). */ 1771 break; 1772 if (uio->uio_resid == 0) 1773 break; 1774 /* 1775 * In canonical mode check for a "break character" 1776 * marking the end of a "line of input". 1777 */ 1778 if (ISSET(lflag, ICANON) && TTBREAKC(c, lflag)) 1779 break; 1780 first = 0; 1781 } 1782 1783 out: 1784 /* 1785 * Look to unblock input now that (presumably) 1786 * the input queue has gone down. 1787 */ 1788 s = spltty(); 1789 if (ISSET(tp->t_state, TS_TBLOCK) && 1790 tp->t_rawq.c_cc + tp->t_canq.c_cc <= tp->t_ilowat) 1791 ttyunblock(tp); 1792 splx(s); 1793 1794 return (error); 1795 } 1796 1797 /* 1798 * Check the output queue on tp for space for a kernel message (from uprintf 1799 * or tprintf). Allow some space over the normal hiwater mark so we don't 1800 * lose messages due to normal flow control, but don't let the tty run amok. 1801 * Sleeps here are not interruptible, but we return prematurely if new signals 1802 * arrive. 1803 */ 1804 int 1805 ttycheckoutq(tp, wait) 1806 struct tty *tp; 1807 int wait; 1808 { 1809 int hiwat, s; 1810 sigset_t oldmask; 1811 1812 hiwat = tp->t_ohiwat; 1813 SIGEMPTYSET(oldmask); 1814 s = spltty(); 1815 if (wait) 1816 oldmask = curproc->p_siglist; 1817 if (tp->t_outq.c_cc > hiwat + OBUFSIZ + 100) 1818 while (tp->t_outq.c_cc > hiwat) { 1819 ttstart(tp); 1820 if (tp->t_outq.c_cc <= hiwat) 1821 break; 1822 if (!(wait && SIGSETEQ(curproc->p_siglist, oldmask))) { 1823 splx(s); 1824 return (0); 1825 } 1826 SET(tp->t_state, TS_SO_OLOWAT); 1827 tsleep(TSA_OLOWAT(tp), 0, "ttoutq", hz); 1828 } 1829 splx(s); 1830 return (1); 1831 } 1832 1833 /* 1834 * Process a write call on a tty device. 1835 */ 1836 int 1837 ttwrite(tp, uio, flag) 1838 struct tty *tp; 1839 struct uio *uio; 1840 int flag; 1841 { 1842 char *cp = NULL; 1843 int cc, ce; 1844 struct proc *p; 1845 int i, hiwat, cnt, error, s; 1846 char obuf[OBUFSIZ]; 1847 1848 hiwat = tp->t_ohiwat; 1849 cnt = uio->uio_resid; 1850 error = 0; 1851 cc = 0; 1852 loop: 1853 s = spltty(); 1854 if (ISSET(tp->t_state, TS_ZOMBIE)) { 1855 splx(s); 1856 if (uio->uio_resid == cnt) 1857 error = EIO; 1858 goto out; 1859 } 1860 if (!ISSET(tp->t_state, TS_CONNECTED)) { 1861 if (flag & IO_NDELAY) { 1862 splx(s); 1863 error = EWOULDBLOCK; 1864 goto out; 1865 } 1866 error = ttysleep(tp, TSA_CARR_ON(tp), PCATCH, "ttydcd", 0); 1867 splx(s); 1868 if (error) 1869 goto out; 1870 goto loop; 1871 } 1872 splx(s); 1873 /* 1874 * Hang the process if it's in the background. 1875 */ 1876 p = curproc; 1877 if (isbackground(p, tp) && 1878 ISSET(tp->t_lflag, TOSTOP) && !(p->p_flag & P_PPWAIT) && 1879 !SIGISMEMBER(p->p_sigignore, SIGTTOU) && 1880 !SIGISMEMBER(p->p_sigmask, SIGTTOU)) { 1881 if (p->p_pgrp->pg_jobc == 0) { 1882 error = EIO; 1883 goto out; 1884 } 1885 pgsignal(p->p_pgrp, SIGTTOU, 1); 1886 error = ttysleep(tp, &lbolt, PCATCH, "ttybg4", 0); 1887 if (error) 1888 goto out; 1889 goto loop; 1890 } 1891 /* 1892 * Process the user's data in at most OBUFSIZ chunks. Perform any 1893 * output translation. Keep track of high water mark, sleep on 1894 * overflow awaiting device aid in acquiring new space. 1895 */ 1896 while (uio->uio_resid > 0 || cc > 0) { 1897 if (ISSET(tp->t_lflag, FLUSHO)) { 1898 uio->uio_resid = 0; 1899 return (0); 1900 } 1901 if (tp->t_outq.c_cc > hiwat) 1902 goto ovhiwat; 1903 /* 1904 * Grab a hunk of data from the user, unless we have some 1905 * leftover from last time. 1906 */ 1907 if (cc == 0) { 1908 cc = imin(uio->uio_resid, OBUFSIZ); 1909 cp = obuf; 1910 error = uiomove(cp, cc, uio); 1911 if (error) { 1912 cc = 0; 1913 break; 1914 } 1915 } 1916 /* 1917 * If nothing fancy need be done, grab those characters we 1918 * can handle without any of ttyoutput's processing and 1919 * just transfer them to the output q. For those chars 1920 * which require special processing (as indicated by the 1921 * bits in char_type), call ttyoutput. After processing 1922 * a hunk of data, look for FLUSHO so ^O's will take effect 1923 * immediately. 1924 */ 1925 while (cc > 0) { 1926 if (!ISSET(tp->t_oflag, OPOST)) 1927 ce = cc; 1928 else { 1929 ce = cc - scanc((u_int)cc, (u_char *)cp, 1930 char_type, CCLASSMASK); 1931 /* 1932 * If ce is zero, then we're processing 1933 * a special character through ttyoutput. 1934 */ 1935 if (ce == 0) { 1936 tp->t_rocount = 0; 1937 if (ttyoutput(*cp, tp) >= 0) { 1938 /* No Clists, wait a bit. */ 1939 ttstart(tp); 1940 if (flag & IO_NDELAY) { 1941 error = EWOULDBLOCK; 1942 goto out; 1943 } 1944 error = ttysleep(tp, &lbolt, 1945 PCATCH, 1946 "ttybf1", 0); 1947 if (error) 1948 goto out; 1949 goto loop; 1950 } 1951 cp++; 1952 cc--; 1953 if (ISSET(tp->t_lflag, FLUSHO) || 1954 tp->t_outq.c_cc > hiwat) 1955 goto ovhiwat; 1956 continue; 1957 } 1958 } 1959 /* 1960 * A bunch of normal characters have been found. 1961 * Transfer them en masse to the output queue and 1962 * continue processing at the top of the loop. 1963 * If there are any further characters in this 1964 * <= OBUFSIZ chunk, the first should be a character 1965 * requiring special handling by ttyoutput. 1966 */ 1967 tp->t_rocount = 0; 1968 i = b_to_q(cp, ce, &tp->t_outq); 1969 ce -= i; 1970 tp->t_column += ce; 1971 cp += ce, cc -= ce, tk_nout += ce; 1972 tp->t_outcc += ce; 1973 if (i > 0) { 1974 /* No Clists, wait a bit. */ 1975 ttstart(tp); 1976 if (flag & IO_NDELAY) { 1977 error = EWOULDBLOCK; 1978 goto out; 1979 } 1980 error = ttysleep(tp, &lbolt, PCATCH, 1981 "ttybf2", 0); 1982 if (error) 1983 goto out; 1984 goto loop; 1985 } 1986 if (ISSET(tp->t_lflag, FLUSHO) || 1987 tp->t_outq.c_cc > hiwat) 1988 break; 1989 } 1990 ttstart(tp); 1991 } 1992 out: 1993 /* 1994 * If cc is nonzero, we leave the uio structure inconsistent, as the 1995 * offset and iov pointers have moved forward, but it doesn't matter 1996 * (the call will either return short or restart with a new uio). 1997 */ 1998 uio->uio_resid += cc; 1999 return (error); 2000 2001 ovhiwat: 2002 ttstart(tp); 2003 s = spltty(); 2004 /* 2005 * This can only occur if FLUSHO is set in t_lflag, 2006 * or if ttstart/oproc is synchronous (or very fast). 2007 */ 2008 if (tp->t_outq.c_cc <= hiwat) { 2009 splx(s); 2010 goto loop; 2011 } 2012 if (flag & IO_NDELAY) { 2013 splx(s); 2014 uio->uio_resid += cc; 2015 return (uio->uio_resid == cnt ? EWOULDBLOCK : 0); 2016 } 2017 SET(tp->t_state, TS_SO_OLOWAT); 2018 error = ttysleep(tp, TSA_OLOWAT(tp), PCATCH, "ttywri", tp->t_timeout); 2019 splx(s); 2020 if (error == EWOULDBLOCK) 2021 error = EIO; 2022 if (error) 2023 goto out; 2024 goto loop; 2025 } 2026 2027 /* 2028 * Rubout one character from the rawq of tp 2029 * as cleanly as possible. 2030 */ 2031 static void 2032 ttyrub(c, tp) 2033 int c; 2034 struct tty *tp; 2035 { 2036 char *cp; 2037 int savecol; 2038 int tabc, s; 2039 2040 if (!ISSET(tp->t_lflag, ECHO) || ISSET(tp->t_lflag, EXTPROC)) 2041 return; 2042 CLR(tp->t_lflag, FLUSHO); 2043 if (ISSET(tp->t_lflag, ECHOE)) { 2044 if (tp->t_rocount == 0) { 2045 /* 2046 * Screwed by ttwrite; retype 2047 */ 2048 ttyretype(tp); 2049 return; 2050 } 2051 if (c == ('\t' | TTY_QUOTE) || c == ('\n' | TTY_QUOTE)) 2052 ttyrubo(tp, 2); 2053 else { 2054 CLR(c, ~TTY_CHARMASK); 2055 switch (CCLASS(c)) { 2056 case ORDINARY: 2057 ttyrubo(tp, 1); 2058 break; 2059 case BACKSPACE: 2060 case CONTROL: 2061 case NEWLINE: 2062 case RETURN: 2063 case VTAB: 2064 if (ISSET(tp->t_lflag, ECHOCTL)) 2065 ttyrubo(tp, 2); 2066 break; 2067 case TAB: 2068 if (tp->t_rocount < tp->t_rawq.c_cc) { 2069 ttyretype(tp); 2070 return; 2071 } 2072 s = spltty(); 2073 savecol = tp->t_column; 2074 SET(tp->t_state, TS_CNTTB); 2075 SET(tp->t_lflag, FLUSHO); 2076 tp->t_column = tp->t_rocol; 2077 cp = tp->t_rawq.c_cf; 2078 if (cp) 2079 tabc = *cp; /* XXX FIX NEXTC */ 2080 for (; cp; cp = nextc(&tp->t_rawq, cp, &tabc)) 2081 ttyecho(tabc, tp); 2082 CLR(tp->t_lflag, FLUSHO); 2083 CLR(tp->t_state, TS_CNTTB); 2084 splx(s); 2085 2086 /* savecol will now be length of the tab. */ 2087 savecol -= tp->t_column; 2088 tp->t_column += savecol; 2089 if (savecol > 8) 2090 savecol = 8; /* overflow screw */ 2091 while (--savecol >= 0) 2092 (void)ttyoutput('\b', tp); 2093 break; 2094 default: /* XXX */ 2095 #define PANICSTR "ttyrub: would panic c = %d, val = %d\n" 2096 (void)printf(PANICSTR, c, CCLASS(c)); 2097 #ifdef notdef 2098 panic(PANICSTR, c, CCLASS(c)); 2099 #endif 2100 } 2101 } 2102 } else if (ISSET(tp->t_lflag, ECHOPRT)) { 2103 if (!ISSET(tp->t_state, TS_ERASE)) { 2104 SET(tp->t_state, TS_ERASE); 2105 (void)ttyoutput('\\', tp); 2106 } 2107 ttyecho(c, tp); 2108 } else { 2109 ttyecho(tp->t_cc[VERASE], tp); 2110 /* 2111 * This code may be executed not only when an ERASE key 2112 * is pressed, but also when ^U (KILL) or ^W (WERASE) are. 2113 * So, I didn't think it was worthwhile to pass the extra 2114 * information (which would need an extra parameter, 2115 * changing every call) needed to distinguish the ERASE2 2116 * case from the ERASE. 2117 */ 2118 } 2119 --tp->t_rocount; 2120 } 2121 2122 /* 2123 * Back over cnt characters, erasing them. 2124 */ 2125 static void 2126 ttyrubo(tp, cnt) 2127 struct tty *tp; 2128 int cnt; 2129 { 2130 2131 while (cnt-- > 0) { 2132 (void)ttyoutput('\b', tp); 2133 (void)ttyoutput(' ', tp); 2134 (void)ttyoutput('\b', tp); 2135 } 2136 } 2137 2138 /* 2139 * ttyretype -- 2140 * Reprint the rawq line. Note, it is assumed that c_cc has already 2141 * been checked. 2142 */ 2143 static void 2144 ttyretype(tp) 2145 struct tty *tp; 2146 { 2147 char *cp; 2148 int s, c; 2149 2150 /* Echo the reprint character. */ 2151 if (tp->t_cc[VREPRINT] != _POSIX_VDISABLE) 2152 ttyecho(tp->t_cc[VREPRINT], tp); 2153 2154 (void)ttyoutput('\n', tp); 2155 2156 /* 2157 * XXX 2158 * FIX: NEXTC IS BROKEN - DOESN'T CHECK QUOTE 2159 * BIT OF FIRST CHAR. 2160 */ 2161 s = spltty(); 2162 for (cp = tp->t_canq.c_cf, c = (cp != NULL ? *cp : 0); 2163 cp != NULL; cp = nextc(&tp->t_canq, cp, &c)) 2164 ttyecho(c, tp); 2165 for (cp = tp->t_rawq.c_cf, c = (cp != NULL ? *cp : 0); 2166 cp != NULL; cp = nextc(&tp->t_rawq, cp, &c)) 2167 ttyecho(c, tp); 2168 CLR(tp->t_state, TS_ERASE); 2169 splx(s); 2170 2171 tp->t_rocount = tp->t_rawq.c_cc; 2172 tp->t_rocol = 0; 2173 } 2174 2175 /* 2176 * Echo a typed character to the terminal. 2177 */ 2178 static void 2179 ttyecho(c, tp) 2180 int c; 2181 struct tty *tp; 2182 { 2183 2184 if (!ISSET(tp->t_state, TS_CNTTB)) 2185 CLR(tp->t_lflag, FLUSHO); 2186 if ((!ISSET(tp->t_lflag, ECHO) && 2187 (c != '\n' || !ISSET(tp->t_lflag, ECHONL))) || 2188 ISSET(tp->t_lflag, EXTPROC)) 2189 return; 2190 if (ISSET(tp->t_lflag, ECHOCTL) && 2191 ((ISSET(c, TTY_CHARMASK) <= 037 && c != '\t' && c != '\n') || 2192 ISSET(c, TTY_CHARMASK) == 0177)) { 2193 (void)ttyoutput('^', tp); 2194 CLR(c, ~TTY_CHARMASK); 2195 if (c == 0177) 2196 c = '?'; 2197 else 2198 c += 'A' - 1; 2199 } 2200 (void)ttyoutput(c, tp); 2201 } 2202 2203 /* 2204 * Wake up any readers on a tty. 2205 */ 2206 void 2207 ttwakeup(tp) 2208 struct tty *tp; 2209 { 2210 2211 if (tp->t_rsel.si_pid != 0) 2212 selwakeup(&tp->t_rsel); 2213 if (ISSET(tp->t_state, TS_ASYNC) && tp->t_sigio != NULL) 2214 pgsigio(tp->t_sigio, SIGIO, (tp->t_session != NULL)); 2215 wakeup(TSA_HUP_OR_INPUT(tp)); 2216 KNOTE(&tp->t_rsel.si_note, 0); 2217 } 2218 2219 /* 2220 * Wake up any writers on a tty. 2221 */ 2222 void 2223 ttwwakeup(tp) 2224 struct tty *tp; 2225 { 2226 2227 if (tp->t_wsel.si_pid != 0 && tp->t_outq.c_cc <= tp->t_olowat) 2228 selwakeup(&tp->t_wsel); 2229 if (ISSET(tp->t_state, TS_ASYNC) && tp->t_sigio != NULL) 2230 pgsigio(tp->t_sigio, SIGIO, (tp->t_session != NULL)); 2231 if (ISSET(tp->t_state, TS_BUSY | TS_SO_OCOMPLETE) == 2232 TS_SO_OCOMPLETE && tp->t_outq.c_cc == 0) { 2233 CLR(tp->t_state, TS_SO_OCOMPLETE); 2234 wakeup(TSA_OCOMPLETE(tp)); 2235 } 2236 if (ISSET(tp->t_state, TS_SO_OLOWAT) && 2237 tp->t_outq.c_cc <= tp->t_olowat) { 2238 CLR(tp->t_state, TS_SO_OLOWAT); 2239 wakeup(TSA_OLOWAT(tp)); 2240 } 2241 KNOTE(&tp->t_wsel.si_note, 0); 2242 } 2243 2244 /* 2245 * Look up a code for a specified speed in a conversion table; 2246 * used by drivers to map software speed values to hardware parameters. 2247 */ 2248 int 2249 ttspeedtab(speed, table) 2250 int speed; 2251 struct speedtab *table; 2252 { 2253 2254 for ( ; table->sp_speed != -1; table++) 2255 if (table->sp_speed == speed) 2256 return (table->sp_code); 2257 return (-1); 2258 } 2259 2260 /* 2261 * Set input and output watermarks and buffer sizes. For input, the 2262 * high watermark is about one second's worth of input above empty, the 2263 * low watermark is slightly below high water, and the buffer size is a 2264 * driver-dependent amount above high water. For output, the watermarks 2265 * are near the ends of the buffer, with about 1 second's worth of input 2266 * between them. All this only applies to the standard line discipline. 2267 */ 2268 void 2269 ttsetwater(tp) 2270 struct tty *tp; 2271 { 2272 int cps, ttmaxhiwat, x; 2273 2274 /* Input. */ 2275 clist_alloc_cblocks(&tp->t_canq, TTYHOG, 512); 2276 switch (tp->t_ispeedwat) { 2277 case (speed_t)-1: 2278 cps = tp->t_ispeed / 10; 2279 break; 2280 case 0: 2281 /* 2282 * This case is for old drivers that don't know about 2283 * t_ispeedwat. Arrange for them to get the old buffer 2284 * sizes and watermarks. 2285 */ 2286 cps = TTYHOG - 2 * 256; 2287 tp->t_ififosize = 2 * 256; 2288 break; 2289 default: 2290 cps = tp->t_ispeedwat / 10; 2291 break; 2292 } 2293 tp->t_ihiwat = cps; 2294 tp->t_ilowat = 7 * cps / 8; 2295 x = cps + tp->t_ififosize; 2296 clist_alloc_cblocks(&tp->t_rawq, x, x); 2297 2298 /* Output. */ 2299 switch (tp->t_ospeedwat) { 2300 case (speed_t)-1: 2301 cps = tp->t_ospeed / 10; 2302 ttmaxhiwat = 2 * TTMAXHIWAT; 2303 break; 2304 case 0: 2305 cps = tp->t_ospeed / 10; 2306 ttmaxhiwat = TTMAXHIWAT; 2307 break; 2308 default: 2309 cps = tp->t_ospeedwat / 10; 2310 ttmaxhiwat = 8 * TTMAXHIWAT; 2311 break; 2312 } 2313 #define CLAMP(x, h, l) ((x) > h ? h : ((x) < l) ? l : (x)) 2314 tp->t_olowat = x = CLAMP(cps / 2, TTMAXLOWAT, TTMINLOWAT); 2315 x += cps; 2316 x = CLAMP(x, ttmaxhiwat, TTMINHIWAT); /* XXX clamps are too magic */ 2317 tp->t_ohiwat = roundup(x, CBSIZE); /* XXX for compat */ 2318 x = imax(tp->t_ohiwat, TTMAXHIWAT); /* XXX for compat/safety */ 2319 x += OBUFSIZ + 100; 2320 clist_alloc_cblocks(&tp->t_outq, x, x); 2321 #undef CLAMP 2322 } 2323 2324 /* 2325 * Report on state of foreground process group. 2326 */ 2327 void 2328 ttyinfo(tp) 2329 struct tty *tp; 2330 { 2331 struct proc *p, *pick; 2332 struct timeval utime, stime; 2333 int tmp; 2334 2335 if (ttycheckoutq(tp,0) == 0) 2336 return; 2337 2338 /* 2339 * We always print the load average, then figure out what else to 2340 * print based on the state of the current process group. 2341 */ 2342 tmp = (averunnable.ldavg[0] * 100 + FSCALE / 2) >> FSHIFT; 2343 ttyprintf(tp, "load: %d.%02d ", tmp / 100, tmp % 100); 2344 2345 if (tp->t_session == NULL) { 2346 ttyprintf(tp, "not a controlling terminal\n"); 2347 } else if (tp->t_pgrp == NULL) { 2348 ttyprintf(tp, "no foreground process group\n"); 2349 } else if ((p = LIST_FIRST(&tp->t_pgrp->pg_members)) == 0) { 2350 ttyprintf(tp, "empty foreground process group\n"); 2351 } else { 2352 /* 2353 * Pick an interesting process. Note that certain elements, 2354 * in particular the wmesg, require a critical section for 2355 * safe access (YYY and we are still not MP safe). 2356 * 2357 * NOTE: p_wmesg is p_thread->td_wmesg, and p_comm is 2358 * p_thread->td_comm. 2359 */ 2360 char buf[64]; 2361 const char *str; 2362 int isinmem; 2363 long vmsz; 2364 int pctcpu; 2365 2366 crit_enter(); 2367 2368 for (pick = NULL; p != 0; p = LIST_NEXT(p, p_pglist)) { 2369 if (proc_compare(pick, p)) 2370 pick = p; 2371 } 2372 2373 /* 2374 * Figure out what wait/process-state message, and command 2375 * buffer to present 2376 */ 2377 if (pick->p_thread == NULL) 2378 str = "exiting"; 2379 else if (pick->p_stat == SRUN) 2380 str = "running"; 2381 else if (pick->p_wmesg) /* p_thread must not be NULL */ 2382 str = pick->p_wmesg; 2383 else 2384 str = "iowait"; 2385 2386 snprintf(buf, sizeof(buf), "cmd: %s %d [%s]", 2387 (pick->p_thread ? pick->p_comm : "?"), 2388 pick->p_pid, str); 2389 2390 /* 2391 * Calculate cpu usage, percent cpu, and cmsz. Note that 2392 * 'pick' becomes invalid the moment we exit the critical 2393 * section. 2394 */ 2395 if (pick->p_thread && (pick->p_flag & P_INMEM)) { 2396 calcru(pick, &utime, &stime, NULL); 2397 isinmem = 1; 2398 } else { 2399 isinmem = 0; 2400 } 2401 2402 pctcpu = (pick->p_pctcpu * 10000 + FSCALE / 2) >> FSHIFT; 2403 2404 if (pick->p_stat == SIDL || pick->p_stat == SZOMB) 2405 vmsz = 0; 2406 else 2407 vmsz = pgtok(vmspace_resident_count(pick->p_vmspace)); 2408 2409 crit_exit(); 2410 2411 /* 2412 * Dump the output 2413 */ 2414 ttyprintf(tp, " %s ", buf); 2415 if (isinmem) { 2416 ttyprintf(tp, "%ld.%02ldu ", 2417 utime.tv_sec, utime.tv_usec / 10000); 2418 ttyprintf(tp, "%ld.%02lds ", 2419 stime.tv_sec, stime.tv_usec / 10000); 2420 } else { 2421 ttyprintf(tp, "?.??u ?.??s "); 2422 } 2423 ttyprintf(tp, "%d%% %ldk\n", pctcpu / 100, vmsz); 2424 } 2425 tp->t_rocount = 0; /* so pending input will be retyped if BS */ 2426 } 2427 2428 /* 2429 * Returns 1 if p2 is "better" than p1 2430 * 2431 * The algorithm for picking the "interesting" process is thus: 2432 * 2433 * 1) Only foreground processes are eligible - implied. 2434 * 2) Runnable processes are favored over anything else. The runner 2435 * with the highest cpu utilization is picked (p_estcpu). Ties are 2436 * broken by picking the highest pid. 2437 * 3) The sleeper with the shortest sleep time is next. With ties, 2438 * we pick out just "short-term" sleepers (P_SINTR == 0). 2439 * 4) Further ties are broken by picking the highest pid. 2440 */ 2441 #define ISRUN(p) (((p)->p_stat == SRUN) || ((p)->p_stat == SIDL)) 2442 #define TESTAB(a, b) ((a)<<1 | (b)) 2443 #define ONLYA 2 2444 #define ONLYB 1 2445 #define BOTH 3 2446 2447 static int 2448 proc_compare(p1, p2) 2449 struct proc *p1, *p2; 2450 { 2451 2452 if (p1 == NULL) 2453 return (1); 2454 /* 2455 * see if at least one of them is runnable 2456 */ 2457 switch (TESTAB(ISRUN(p1), ISRUN(p2))) { 2458 case ONLYA: 2459 return (0); 2460 case ONLYB: 2461 return (1); 2462 case BOTH: 2463 /* 2464 * tie - favor one with highest recent cpu utilization 2465 */ 2466 if (p2->p_estcpu > p1->p_estcpu) 2467 return (1); 2468 if (p1->p_estcpu > p2->p_estcpu) 2469 return (0); 2470 return (p2->p_pid > p1->p_pid); /* tie - return highest pid */ 2471 } 2472 /* 2473 * weed out zombies 2474 */ 2475 switch (TESTAB(p1->p_stat == SZOMB, p2->p_stat == SZOMB)) { 2476 case ONLYA: 2477 return (1); 2478 case ONLYB: 2479 return (0); 2480 case BOTH: 2481 return (p2->p_pid > p1->p_pid); /* tie - return highest pid */ 2482 } 2483 /* 2484 * pick the one with the smallest sleep time 2485 */ 2486 if (p2->p_slptime > p1->p_slptime) 2487 return (0); 2488 if (p1->p_slptime > p2->p_slptime) 2489 return (1); 2490 /* 2491 * favor one sleeping in a non-interruptible sleep 2492 */ 2493 if (p1->p_flag & P_SINTR && (p2->p_flag & P_SINTR) == 0) 2494 return (1); 2495 if (p2->p_flag & P_SINTR && (p1->p_flag & P_SINTR) == 0) 2496 return (0); 2497 return (p2->p_pid > p1->p_pid); /* tie - return highest pid */ 2498 } 2499 2500 /* 2501 * Output char to tty; console putchar style. 2502 */ 2503 int 2504 tputchar(c, tp) 2505 int c; 2506 struct tty *tp; 2507 { 2508 int s; 2509 2510 s = spltty(); 2511 if (!ISSET(tp->t_state, TS_CONNECTED)) { 2512 splx(s); 2513 return (-1); 2514 } 2515 if (c == '\n') 2516 (void)ttyoutput('\r', tp); 2517 (void)ttyoutput(c, tp); 2518 ttstart(tp); 2519 splx(s); 2520 return (0); 2521 } 2522 2523 /* 2524 * Sleep on chan, returning ERESTART if tty changed while we napped and 2525 * returning any errors (e.g. EINTR/EWOULDBLOCK) reported by tsleep. If 2526 * the tty is revoked, restarting a pending call will redo validation done 2527 * at the start of the call. 2528 */ 2529 int 2530 ttysleep(tp, chan, slpflags, wmesg, timo) 2531 struct tty *tp; 2532 void *chan; 2533 int slpflags, timo; 2534 char *wmesg; 2535 { 2536 int error; 2537 int gen; 2538 2539 gen = tp->t_gen; 2540 error = tsleep(chan, slpflags, wmesg, timo); 2541 if (error) 2542 return (error); 2543 return (tp->t_gen == gen ? 0 : ERESTART); 2544 } 2545 2546 /* 2547 * Allocate a tty struct. Clists in the struct will be allocated by 2548 * ttyopen(). 2549 */ 2550 struct tty * 2551 ttymalloc(tp) 2552 struct tty *tp; 2553 { 2554 2555 if (tp) 2556 return(tp); 2557 tp = malloc(sizeof *tp, M_TTYS, M_WAITOK); 2558 bzero(tp, sizeof *tp); 2559 ttyregister(tp); 2560 return (tp); 2561 } 2562 2563 #if 0 2564 /* 2565 * Free a tty struct. Clists in the struct should have been freed by 2566 * ttyclose(). 2567 * 2568 * XXX not yet usable: since we support a half-closed state and do not 2569 * ref count the tty reference from the session, it is possible for a 2570 * session to hold a ref on the tty. See TTY_DO_FULL_CLOSE. 2571 */ 2572 void 2573 ttyfree(tp) 2574 struct tty *tp; 2575 { 2576 free(tp, M_TTYS); 2577 } 2578 #endif /* 0 */ 2579 2580 void 2581 ttyregister(tp) 2582 struct tty *tp; 2583 { 2584 SLIST_INSERT_HEAD(&tty_list, tp, t_list); 2585 } 2586 2587 static int 2588 sysctl_kern_ttys(SYSCTL_HANDLER_ARGS) 2589 { 2590 int error; 2591 struct tty *tp, t; 2592 SLIST_FOREACH(tp, &tty_list, t_list) { 2593 t = *tp; 2594 if (t.t_dev) 2595 t.t_dev = (dev_t)dev2udev(t.t_dev); 2596 error = SYSCTL_OUT(req, (caddr_t)&t, sizeof(t)); 2597 if (error) 2598 return (error); 2599 } 2600 return (0); 2601 } 2602 2603 SYSCTL_PROC(_kern, OID_AUTO, ttys, CTLTYPE_OPAQUE|CTLFLAG_RD, 2604 0, 0, sysctl_kern_ttys, "S,tty", "All struct ttys"); 2605 2606 void 2607 nottystop(tp, rw) 2608 struct tty *tp; 2609 int rw; 2610 { 2611 2612 return; 2613 } 2614 2615 int 2616 ttyread(dev, uio, flag) 2617 dev_t dev; 2618 struct uio *uio; 2619 int flag; 2620 { 2621 struct tty *tp; 2622 2623 tp = dev->si_tty; 2624 if (tp == NULL) 2625 return (ENODEV); 2626 return ((*linesw[tp->t_line].l_read)(tp, uio, flag)); 2627 } 2628 2629 int 2630 ttywrite(dev, uio, flag) 2631 dev_t dev; 2632 struct uio *uio; 2633 int flag; 2634 { 2635 struct tty *tp; 2636 2637 tp = dev->si_tty; 2638 if (tp == NULL) 2639 return (ENODEV); 2640 return ((*linesw[tp->t_line].l_write)(tp, uio, flag)); 2641 } 2642