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 1.25 2006/07/28 02:17:40 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 #include <sys/clist.h> 84 #undef TTYDEFCHARS 85 #include <sys/fcntl.h> 86 #include <sys/conf.h> 87 #include <sys/dkstat.h> 88 #include <sys/poll.h> 89 #include <sys/kernel.h> 90 #include <sys/vnode.h> 91 #include <sys/signalvar.h> 92 #include <sys/resourcevar.h> 93 #include <sys/malloc.h> 94 #include <sys/filedesc.h> 95 #include <sys/sysctl.h> 96 #include <sys/thread2.h> 97 98 #include <vm/vm.h> 99 #include <sys/lock.h> 100 #include <vm/pmap.h> 101 #include <vm/vm_map.h> 102 103 MALLOC_DEFINE(M_TTYS, "ttys", "tty data structures"); 104 105 static int proc_compare (struct proc *p1, struct proc *p2); 106 static int ttnread (struct tty *tp); 107 static void ttyecho (int c, struct tty *tp); 108 static int ttyoutput (int c, struct tty *tp); 109 static void ttypend (struct tty *tp); 110 static void ttyretype (struct tty *tp); 111 static void ttyrub (int c, struct tty *tp); 112 static void ttyrubo (struct tty *tp, int cnt); 113 static void ttyunblock (struct tty *tp); 114 static int ttywflush (struct tty *tp); 115 static int filt_ttyread (struct knote *kn, long hint); 116 static void filt_ttyrdetach (struct knote *kn); 117 static int filt_ttywrite (struct knote *kn, long hint); 118 static void filt_ttywdetach (struct knote *kn); 119 120 /* 121 * Table with character classes and parity. The 8th bit indicates parity, 122 * the 7th bit indicates the character is an alphameric or underscore (for 123 * ALTWERASE), and the low 6 bits indicate delay type. If the low 6 bits 124 * are 0 then the character needs no special processing on output; classes 125 * other than 0 might be translated or (not currently) require delays. 126 */ 127 #define E 0x00 /* Even parity. */ 128 #define O 0x80 /* Odd parity. */ 129 #define PARITY(c) (char_type[c] & O) 130 131 #define ALPHA 0x40 /* Alpha or underscore. */ 132 #define ISALPHA(c) (char_type[(c) & TTY_CHARMASK] & ALPHA) 133 134 #define CCLASSMASK 0x3f 135 #define CCLASS(c) (char_type[c] & CCLASSMASK) 136 137 #define BS BACKSPACE 138 #define CC CONTROL 139 #define CR RETURN 140 #define NA ORDINARY | ALPHA 141 #define NL NEWLINE 142 #define NO ORDINARY 143 #define TB TAB 144 #define VT VTAB 145 146 static u_char const char_type[] = { 147 E|CC, O|CC, O|CC, E|CC, O|CC, E|CC, E|CC, O|CC, /* nul - bel */ 148 O|BS, E|TB, E|NL, O|CC, E|VT, O|CR, O|CC, E|CC, /* bs - si */ 149 O|CC, E|CC, E|CC, O|CC, E|CC, O|CC, O|CC, E|CC, /* dle - etb */ 150 E|CC, O|CC, O|CC, E|CC, O|CC, E|CC, E|CC, O|CC, /* can - us */ 151 O|NO, E|NO, E|NO, O|NO, E|NO, O|NO, O|NO, E|NO, /* sp - ' */ 152 E|NO, O|NO, O|NO, E|NO, O|NO, E|NO, E|NO, O|NO, /* ( - / */ 153 E|NA, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* 0 - 7 */ 154 O|NA, E|NA, E|NO, O|NO, E|NO, O|NO, O|NO, E|NO, /* 8 - ? */ 155 O|NO, E|NA, E|NA, O|NA, E|NA, O|NA, O|NA, E|NA, /* @ - G */ 156 E|NA, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* H - O */ 157 E|NA, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* P - W */ 158 O|NA, E|NA, E|NA, O|NO, E|NO, O|NO, O|NO, O|NA, /* X - _ */ 159 E|NO, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* ` - g */ 160 O|NA, E|NA, E|NA, O|NA, E|NA, O|NA, O|NA, E|NA, /* h - o */ 161 O|NA, E|NA, E|NA, O|NA, E|NA, O|NA, O|NA, E|NA, /* p - w */ 162 E|NA, O|NA, O|NA, E|NO, O|NO, E|NO, E|NO, O|CC, /* x - del */ 163 /* 164 * Meta chars; should be settable per character set; 165 * for now, treat them all as normal characters. 166 */ 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 NA, NA, NA, NA, NA, NA, NA, NA, 183 }; 184 #undef BS 185 #undef CC 186 #undef CR 187 #undef NA 188 #undef NL 189 #undef NO 190 #undef TB 191 #undef VT 192 193 /* Macros to clear/set/test flags. */ 194 #define SET(t, f) (t) |= (f) 195 #define CLR(t, f) (t) &= ~(f) 196 #define ISSET(t, f) ((t) & (f)) 197 198 #undef MAX_INPUT /* XXX wrong in <sys/syslimits.h> */ 199 #define MAX_INPUT TTYHOG /* XXX limit is usually larger for !ICANON */ 200 201 uint64_t tk_nin; 202 SYSCTL_OPAQUE(_kern, OID_AUTO, tk_nin, CTLFLAG_RD, &tk_nin, sizeof(tk_nin), 203 "LU", "TTY input statistic"); 204 uint64_t tk_nout; 205 SYSCTL_OPAQUE(_kern, OID_AUTO, tk_nout, CTLFLAG_RD, &tk_nout, sizeof(tk_nout), 206 "LU", "TTY output statistic"); 207 uint64_t tk_rawcc; 208 209 /* 210 * list of struct tty where pstat(8) can pick it up with sysctl 211 */ 212 static SLIST_HEAD(, tty) tty_list; 213 214 /* 215 * Initial open of tty, or (re)entry to standard tty line discipline. 216 */ 217 int 218 ttyopen(device, tp) 219 dev_t device; 220 struct tty *tp; 221 { 222 crit_enter(); 223 tp->t_dev = device; 224 if (!ISSET(tp->t_state, TS_ISOPEN)) { 225 SET(tp->t_state, TS_ISOPEN); 226 if (ISSET(tp->t_cflag, CLOCAL)) 227 SET(tp->t_state, TS_CONNECTED); 228 bzero(&tp->t_winsize, sizeof(tp->t_winsize)); 229 } 230 ttsetwater(tp); 231 crit_exit(); 232 return (0); 233 } 234 235 /* 236 * Handle close() on a tty line: flush and set to initial state, 237 * bumping generation number so that pending read/write calls 238 * can detect recycling of the tty. 239 * 240 * XXX our caller should have done `spltty(); l_close(); ttyclose();' 241 * and l_close() should have flushed, but we repeat the spltty() and 242 * the flush in case there are buggy callers. 243 */ 244 int 245 ttyclose(tp) 246 struct tty *tp; 247 { 248 funsetown(tp->t_sigio); 249 crit_enter(); 250 if (constty == tp) 251 constty = NULL; 252 253 ttyflush(tp, FREAD | FWRITE); 254 clist_free_cblocks(&tp->t_canq); 255 clist_free_cblocks(&tp->t_outq); 256 clist_free_cblocks(&tp->t_rawq); 257 258 tp->t_gen++; 259 tp->t_line = TTYDISC; 260 ttyclearsession(tp); 261 tp->t_state = 0; 262 crit_exit(); 263 return (0); 264 } 265 266 /* 267 * Disassociate the tty from its session. Traditionally this has only been 268 * a half-close, meaning that the session was still allowed to point at the 269 * tty (resulting in the tty in the ps command showing something like 'p0-'), 270 * even though the tty is no longer pointing at the session. 271 * 272 * The half close seems to be useful only for 'ps' output but there is as 273 * yet no reason to remove the feature. The full-close code is currently 274 * #if 0'd out. See also sess_rele() in kern/kern_proc.c. 275 */ 276 void 277 ttyclearsession(struct tty *tp) 278 { 279 struct session *sp; 280 281 tp->t_pgrp = NULL; 282 if ((sp = tp->t_session) != NULL) { 283 tp->t_session = NULL; 284 #ifdef TTY_DO_FULL_CLOSE 285 /* FULL CLOSE (not yet) */ 286 if (sp->s_ttyp == tp) { 287 sp->s_ttyp = NULL; 288 } else { 289 printf("ttyclearsession: warning: sp->s_ttyp != tp " 290 "%p/%p\n", sp->s_ttyp, tp); 291 } 292 #endif 293 } 294 } 295 296 /* 297 * Terminate the tty vnode association for a session. This is the 298 * 'other half' of the close. Because multiple opens of /dev/tty 299 * only generate a single open to the actual tty, the file modes 300 * are locked to FREAD|FWRITE. 301 */ 302 void 303 ttyclosesession(struct session *sp, int dorele) 304 { 305 struct vnode *vp; 306 307 if ((vp = sp->s_ttyvp) == NULL) 308 return; 309 sp->s_ttyvp = NULL; 310 if (vp->v_flag & VCTTYISOPEN) { 311 if (vn_lock(vp, LK_EXCLUSIVE|LK_RETRY) == 0) { 312 vclrflags(vp, VCTTYISOPEN); 313 VOP_CLOSE(vp, FREAD|FWRITE); 314 VOP_UNLOCK(vp, 0); 315 } 316 } 317 if (dorele) 318 vrele(vp); 319 } 320 321 322 #define FLUSHQ(q) { \ 323 if ((q)->c_cc) \ 324 ndflush(q, (q)->c_cc); \ 325 } 326 327 /* Is 'c' a line delimiter ("break" character)? */ 328 #define TTBREAKC(c, lflag) \ 329 ((c) == '\n' || (((c) == cc[VEOF] || \ 330 (c) == cc[VEOL] || ((c) == cc[VEOL2] && lflag & IEXTEN)) && \ 331 (c) != _POSIX_VDISABLE)) 332 333 /* 334 * Process input of a single character received on a tty. 335 */ 336 int 337 ttyinput(c, tp) 338 int c; 339 struct tty *tp; 340 { 341 tcflag_t iflag, lflag; 342 cc_t *cc; 343 int i, err; 344 345 /* 346 * If input is pending take it first. 347 */ 348 lflag = tp->t_lflag; 349 if (ISSET(lflag, PENDIN)) 350 ttypend(tp); 351 /* 352 * Gather stats. 353 */ 354 if (ISSET(lflag, ICANON)) 355 ++tp->t_cancc; 356 else 357 ++tp->t_rawcc; 358 ++tk_nin; 359 360 /* 361 * Block further input iff: 362 * current input > threshold AND input is available to user program 363 * AND input flow control is enabled and not yet invoked. 364 * The 3 is slop for PARMRK. 365 */ 366 iflag = tp->t_iflag; 367 if (tp->t_rawq.c_cc + tp->t_canq.c_cc > tp->t_ihiwat - 3 && 368 (!ISSET(lflag, ICANON) || tp->t_canq.c_cc != 0) && 369 (ISSET(tp->t_cflag, CRTS_IFLOW) || ISSET(iflag, IXOFF)) && 370 !ISSET(tp->t_state, TS_TBLOCK)) 371 ttyblock(tp); 372 373 /* Handle exceptional conditions (break, parity, framing). */ 374 cc = tp->t_cc; 375 err = (ISSET(c, TTY_ERRORMASK)); 376 if (err) { 377 CLR(c, TTY_ERRORMASK); 378 if (ISSET(err, TTY_BI)) { 379 if (ISSET(iflag, IGNBRK)) 380 return (0); 381 if (ISSET(iflag, BRKINT)) { 382 ttyflush(tp, FREAD | FWRITE); 383 pgsignal(tp->t_pgrp, SIGINT, 1); 384 goto endcase; 385 } 386 if (ISSET(iflag, PARMRK)) 387 goto parmrk; 388 } else if ((ISSET(err, TTY_PE) && ISSET(iflag, INPCK)) 389 || ISSET(err, TTY_FE)) { 390 if (ISSET(iflag, IGNPAR)) 391 return (0); 392 else if (ISSET(iflag, PARMRK)) { 393 parmrk: 394 if (tp->t_rawq.c_cc + tp->t_canq.c_cc > 395 MAX_INPUT - 3) 396 goto input_overflow; 397 (void)putc(0377 | TTY_QUOTE, &tp->t_rawq); 398 (void)putc(0 | TTY_QUOTE, &tp->t_rawq); 399 (void)putc(c | TTY_QUOTE, &tp->t_rawq); 400 goto endcase; 401 } else 402 c = 0; 403 } 404 } 405 406 if (!ISSET(tp->t_state, TS_TYPEN) && ISSET(iflag, ISTRIP)) 407 CLR(c, 0x80); 408 if (!ISSET(lflag, EXTPROC)) { 409 /* 410 * Check for literal nexting very first 411 */ 412 if (ISSET(tp->t_state, TS_LNCH)) { 413 SET(c, TTY_QUOTE); 414 CLR(tp->t_state, TS_LNCH); 415 } 416 /* 417 * Scan for special characters. This code 418 * is really just a big case statement with 419 * non-constant cases. The bottom of the 420 * case statement is labeled ``endcase'', so goto 421 * it after a case match, or similar. 422 */ 423 424 /* 425 * Control chars which aren't controlled 426 * by ICANON, ISIG, or IXON. 427 */ 428 if (ISSET(lflag, IEXTEN)) { 429 if (CCEQ(cc[VLNEXT], c)) { 430 if (ISSET(lflag, ECHO)) { 431 if (ISSET(lflag, ECHOE)) { 432 (void)ttyoutput('^', tp); 433 (void)ttyoutput('\b', tp); 434 } else 435 ttyecho(c, tp); 436 } 437 SET(tp->t_state, TS_LNCH); 438 goto endcase; 439 } 440 if (CCEQ(cc[VDISCARD], c)) { 441 if (ISSET(lflag, FLUSHO)) 442 CLR(tp->t_lflag, FLUSHO); 443 else { 444 ttyflush(tp, FWRITE); 445 ttyecho(c, tp); 446 if (tp->t_rawq.c_cc + tp->t_canq.c_cc) 447 ttyretype(tp); 448 SET(tp->t_lflag, FLUSHO); 449 } 450 goto startoutput; 451 } 452 } 453 /* 454 * Signals. 455 */ 456 if (ISSET(lflag, ISIG)) { 457 if (CCEQ(cc[VINTR], c) || CCEQ(cc[VQUIT], c)) { 458 if (!ISSET(lflag, NOFLSH)) 459 ttyflush(tp, FREAD | FWRITE); 460 ttyecho(c, tp); 461 pgsignal(tp->t_pgrp, 462 CCEQ(cc[VINTR], c) ? SIGINT : SIGQUIT, 1); 463 goto endcase; 464 } 465 if (CCEQ(cc[VSUSP], c)) { 466 if (!ISSET(lflag, NOFLSH)) 467 ttyflush(tp, FREAD); 468 ttyecho(c, tp); 469 pgsignal(tp->t_pgrp, SIGTSTP, 1); 470 goto endcase; 471 } 472 } 473 /* 474 * Handle start/stop characters. 475 */ 476 if (ISSET(iflag, IXON)) { 477 if (CCEQ(cc[VSTOP], c)) { 478 if (!ISSET(tp->t_state, TS_TTSTOP)) { 479 SET(tp->t_state, TS_TTSTOP); 480 (*tp->t_stop)(tp, 0); 481 return (0); 482 } 483 if (!CCEQ(cc[VSTART], c)) 484 return (0); 485 /* 486 * if VSTART == VSTOP then toggle 487 */ 488 goto endcase; 489 } 490 if (CCEQ(cc[VSTART], c)) 491 goto restartoutput; 492 } 493 /* 494 * IGNCR, ICRNL, & INLCR 495 */ 496 if (c == '\r') { 497 if (ISSET(iflag, IGNCR)) 498 return (0); 499 else if (ISSET(iflag, ICRNL)) 500 c = '\n'; 501 } else if (c == '\n' && ISSET(iflag, INLCR)) 502 c = '\r'; 503 } 504 if (!ISSET(tp->t_lflag, EXTPROC) && ISSET(lflag, ICANON)) { 505 /* 506 * From here on down canonical mode character 507 * processing takes place. 508 */ 509 /* 510 * erase or erase2 (^H / ^?) 511 */ 512 if (CCEQ(cc[VERASE], c) || CCEQ(cc[VERASE2], c) ) { 513 if (tp->t_rawq.c_cc) 514 ttyrub(unputc(&tp->t_rawq), tp); 515 goto endcase; 516 } 517 /* 518 * kill (^U) 519 */ 520 if (CCEQ(cc[VKILL], c)) { 521 if (ISSET(lflag, ECHOKE) && 522 tp->t_rawq.c_cc == tp->t_rocount && 523 !ISSET(lflag, ECHOPRT)) 524 while (tp->t_rawq.c_cc) 525 ttyrub(unputc(&tp->t_rawq), tp); 526 else { 527 ttyecho(c, tp); 528 if (ISSET(lflag, ECHOK) || 529 ISSET(lflag, ECHOKE)) 530 ttyecho('\n', tp); 531 FLUSHQ(&tp->t_rawq); 532 tp->t_rocount = 0; 533 } 534 CLR(tp->t_state, TS_LOCAL); 535 goto endcase; 536 } 537 /* 538 * word erase (^W) 539 */ 540 if (CCEQ(cc[VWERASE], c) && ISSET(lflag, IEXTEN)) { 541 int ctype; 542 543 /* 544 * erase whitespace 545 */ 546 while ((c = unputc(&tp->t_rawq)) == ' ' || c == '\t') 547 ttyrub(c, tp); 548 if (c == -1) 549 goto endcase; 550 /* 551 * erase last char of word and remember the 552 * next chars type (for ALTWERASE) 553 */ 554 ttyrub(c, tp); 555 c = unputc(&tp->t_rawq); 556 if (c == -1) 557 goto endcase; 558 if (c == ' ' || c == '\t') { 559 (void)putc(c, &tp->t_rawq); 560 goto endcase; 561 } 562 ctype = ISALPHA(c); 563 /* 564 * erase rest of word 565 */ 566 do { 567 ttyrub(c, tp); 568 c = unputc(&tp->t_rawq); 569 if (c == -1) 570 goto endcase; 571 } while (c != ' ' && c != '\t' && 572 (!ISSET(lflag, ALTWERASE) || ISALPHA(c) == ctype)); 573 (void)putc(c, &tp->t_rawq); 574 goto endcase; 575 } 576 /* 577 * reprint line (^R) 578 */ 579 if (CCEQ(cc[VREPRINT], c) && ISSET(lflag, IEXTEN)) { 580 ttyretype(tp); 581 goto endcase; 582 } 583 /* 584 * ^T - kernel info and generate SIGINFO 585 */ 586 if (CCEQ(cc[VSTATUS], c) && ISSET(lflag, IEXTEN)) { 587 if (ISSET(lflag, ISIG)) 588 pgsignal(tp->t_pgrp, SIGINFO, 1); 589 if (!ISSET(lflag, NOKERNINFO)) 590 ttyinfo(tp); 591 goto endcase; 592 } 593 if (CCEQ(cc[VCHECKPT], c) && ISSET(lflag, IEXTEN)) { 594 if (ISSET(lflag, ISIG)) 595 pgsignal(tp->t_pgrp, SIGCKPT, 1); 596 goto endcase; 597 } 598 } 599 /* 600 * Check for input buffer overflow 601 */ 602 if (tp->t_rawq.c_cc + tp->t_canq.c_cc >= MAX_INPUT) { 603 input_overflow: 604 if (ISSET(iflag, IMAXBEL)) { 605 if (tp->t_outq.c_cc < tp->t_ohiwat) 606 (void)ttyoutput(CTRL('g'), tp); 607 } 608 goto endcase; 609 } 610 611 if ( c == 0377 && ISSET(iflag, PARMRK) && !ISSET(iflag, ISTRIP) 612 && ISSET(iflag, IGNBRK|IGNPAR) != (IGNBRK|IGNPAR)) 613 (void)putc(0377 | TTY_QUOTE, &tp->t_rawq); 614 615 /* 616 * Put data char in q for user and 617 * wakeup on seeing a line delimiter. 618 */ 619 if (putc(c, &tp->t_rawq) >= 0) { 620 if (!ISSET(lflag, ICANON)) { 621 ttwakeup(tp); 622 ttyecho(c, tp); 623 goto endcase; 624 } 625 if (TTBREAKC(c, lflag)) { 626 tp->t_rocount = 0; 627 catq(&tp->t_rawq, &tp->t_canq); 628 ttwakeup(tp); 629 } else if (tp->t_rocount++ == 0) 630 tp->t_rocol = tp->t_column; 631 if (ISSET(tp->t_state, TS_ERASE)) { 632 /* 633 * end of prterase \.../ 634 */ 635 CLR(tp->t_state, TS_ERASE); 636 (void)ttyoutput('/', tp); 637 } 638 i = tp->t_column; 639 ttyecho(c, tp); 640 if (CCEQ(cc[VEOF], c) && ISSET(lflag, ECHO)) { 641 /* 642 * Place the cursor over the '^' of the ^D. 643 */ 644 i = imin(2, tp->t_column - i); 645 while (i > 0) { 646 (void)ttyoutput('\b', tp); 647 i--; 648 } 649 } 650 } 651 endcase: 652 /* 653 * IXANY means allow any character to restart output. 654 */ 655 if (ISSET(tp->t_state, TS_TTSTOP) && 656 !ISSET(iflag, IXANY) && cc[VSTART] != cc[VSTOP]) 657 return (0); 658 restartoutput: 659 CLR(tp->t_lflag, FLUSHO); 660 CLR(tp->t_state, TS_TTSTOP); 661 startoutput: 662 return (ttstart(tp)); 663 } 664 665 /* 666 * Output a single character on a tty, doing output processing 667 * as needed (expanding tabs, newline processing, etc.). 668 * Returns < 0 if succeeds, otherwise returns char to resend. 669 * Must be recursive. 670 */ 671 static int 672 ttyoutput(c, tp) 673 int c; 674 struct tty *tp; 675 { 676 tcflag_t oflag; 677 int col; 678 679 oflag = tp->t_oflag; 680 if (!ISSET(oflag, OPOST)) { 681 if (ISSET(tp->t_lflag, FLUSHO)) 682 return (-1); 683 if (putc(c, &tp->t_outq)) 684 return (c); 685 tk_nout++; 686 tp->t_outcc++; 687 return (-1); 688 } 689 /* 690 * Do tab expansion if OXTABS is set. Special case if we external 691 * processing, we don't do the tab expansion because we'll probably 692 * get it wrong. If tab expansion needs to be done, let it happen 693 * externally. 694 */ 695 CLR(c, ~TTY_CHARMASK); 696 if (c == '\t' && 697 ISSET(oflag, OXTABS) && !ISSET(tp->t_lflag, EXTPROC)) { 698 c = 8 - (tp->t_column & 7); 699 if (!ISSET(tp->t_lflag, FLUSHO)) { 700 crit_enter(); /* Don't interrupt tabs. */ 701 c -= b_to_q(" ", c, &tp->t_outq); 702 tk_nout += c; 703 tp->t_outcc += c; 704 crit_exit(); 705 } 706 tp->t_column += c; 707 return (c ? -1 : '\t'); 708 } 709 if (c == CEOT && ISSET(oflag, ONOEOT)) 710 return (-1); 711 712 /* 713 * Newline translation: if ONLCR is set, 714 * translate newline into "\r\n". 715 */ 716 if (c == '\n' && ISSET(tp->t_oflag, ONLCR)) { 717 tk_nout++; 718 tp->t_outcc++; 719 if (!ISSET(tp->t_lflag, FLUSHO) && putc('\r', &tp->t_outq)) 720 return (c); 721 } 722 /* If OCRNL is set, translate "\r" into "\n". */ 723 else if (c == '\r' && ISSET(tp->t_oflag, OCRNL)) 724 c = '\n'; 725 /* If ONOCR is set, don't transmit CRs when on column 0. */ 726 else if (c == '\r' && ISSET(tp->t_oflag, ONOCR) && tp->t_column == 0) 727 return (-1); 728 729 tk_nout++; 730 tp->t_outcc++; 731 if (!ISSET(tp->t_lflag, FLUSHO) && putc(c, &tp->t_outq)) 732 return (c); 733 734 col = tp->t_column; 735 switch (CCLASS(c)) { 736 case BACKSPACE: 737 if (col > 0) 738 --col; 739 break; 740 case CONTROL: 741 break; 742 case NEWLINE: 743 if (ISSET(tp->t_oflag, ONLCR | ONLRET)) 744 col = 0; 745 break; 746 case RETURN: 747 col = 0; 748 break; 749 case ORDINARY: 750 ++col; 751 break; 752 case TAB: 753 col = (col + 8) & ~7; 754 break; 755 } 756 tp->t_column = col; 757 return (-1); 758 } 759 760 /* 761 * Ioctls for all tty devices. Called after line-discipline specific ioctl 762 * has been called to do discipline-specific functions and/or reject any 763 * of these ioctl commands. 764 */ 765 /* ARGSUSED */ 766 int 767 ttioctl(struct tty *tp, u_long cmd, void *data, int flag) 768 { 769 struct thread *td = curthread; 770 struct proc *p = td->td_proc; 771 int error; 772 773 KKASSERT(p); 774 775 /* If the ioctl involves modification, hang if in the background. */ 776 switch (cmd) { 777 case TIOCCBRK: 778 case TIOCCONS: 779 case TIOCDRAIN: 780 case TIOCEXCL: 781 case TIOCFLUSH: 782 #ifdef TIOCHPCL 783 case TIOCHPCL: 784 #endif 785 case TIOCNXCL: 786 case TIOCSBRK: 787 case TIOCSCTTY: 788 case TIOCSDRAINWAIT: 789 case TIOCSETA: 790 case TIOCSETAF: 791 case TIOCSETAW: 792 case TIOCSETD: 793 case TIOCSPGRP: 794 case TIOCSTART: 795 case TIOCSTAT: 796 case TIOCSTI: 797 case TIOCSTOP: 798 case TIOCSWINSZ: 799 #if defined(COMPAT_43) || defined(COMPAT_SUNOS) 800 case TIOCLBIC: 801 case TIOCLBIS: 802 case TIOCLSET: 803 case TIOCSETC: 804 case OTIOCSETD: 805 case TIOCSETN: 806 case TIOCSETP: 807 case TIOCSLTC: 808 #endif 809 while (isbackground(p, tp) && !(p->p_flag & P_PPWAIT) && 810 !SIGISMEMBER(p->p_sigignore, SIGTTOU) && 811 !SIGISMEMBER(p->p_sigmask, SIGTTOU)) { 812 if (p->p_pgrp->pg_jobc == 0) 813 return (EIO); 814 pgsignal(p->p_pgrp, SIGTTOU, 1); 815 error = ttysleep(tp, &lbolt, PCATCH, "ttybg1", 816 0); 817 if (error) 818 return (error); 819 } 820 break; 821 } 822 823 switch (cmd) { /* Process the ioctl. */ 824 case FIOASYNC: /* set/clear async i/o */ 825 crit_enter(); 826 if (*(int *)data) 827 SET(tp->t_state, TS_ASYNC); 828 else 829 CLR(tp->t_state, TS_ASYNC); 830 crit_exit(); 831 break; 832 case FIONREAD: /* get # bytes to read */ 833 crit_enter(); 834 *(int *)data = ttnread(tp); 835 crit_exit(); 836 break; 837 838 case FIOSETOWN: 839 /* 840 * Policy -- Don't allow FIOSETOWN on someone else's 841 * controlling tty 842 */ 843 if (tp->t_session != NULL && !isctty(p, tp)) 844 return (ENOTTY); 845 846 error = fsetown(*(int *)data, &tp->t_sigio); 847 if (error) 848 return (error); 849 break; 850 case FIOGETOWN: 851 if (tp->t_session != NULL && !isctty(p, tp)) 852 return (ENOTTY); 853 *(int *)data = fgetown(tp->t_sigio); 854 break; 855 856 case TIOCEXCL: /* set exclusive use of tty */ 857 crit_enter(); 858 SET(tp->t_state, TS_XCLUDE); 859 crit_exit(); 860 break; 861 case TIOCFLUSH: { /* flush buffers */ 862 int flags = *(int *)data; 863 864 if (flags == 0) 865 flags = FREAD | FWRITE; 866 else 867 flags &= FREAD | FWRITE; 868 ttyflush(tp, flags); 869 break; 870 } 871 case TIOCCONS: /* become virtual console */ 872 if (*(int *)data) { 873 if (constty && constty != tp && 874 ISSET(constty->t_state, TS_CONNECTED)) 875 return (EBUSY); 876 #ifndef UCONSOLE 877 if ((error = suser(td)) != 0) 878 return (error); 879 #endif 880 constty = tp; 881 } else if (tp == constty) 882 constty = NULL; 883 break; 884 case TIOCDRAIN: /* wait till output drained */ 885 error = ttywait(tp); 886 if (error) 887 return (error); 888 break; 889 case TIOCGETA: { /* get termios struct */ 890 struct termios *t = (struct termios *)data; 891 892 bcopy(&tp->t_termios, t, sizeof(struct termios)); 893 break; 894 } 895 case TIOCGETD: /* get line discipline */ 896 *(int *)data = tp->t_line; 897 break; 898 case TIOCGWINSZ: /* get window size */ 899 *(struct winsize *)data = tp->t_winsize; 900 break; 901 case TIOCGPGRP: /* get pgrp of tty */ 902 if (!isctty(p, tp)) 903 return (ENOTTY); 904 *(int *)data = tp->t_pgrp ? tp->t_pgrp->pg_id : NO_PID; 905 break; 906 #ifdef TIOCHPCL 907 case TIOCHPCL: /* hang up on last close */ 908 crit_enter(); 909 SET(tp->t_cflag, HUPCL); 910 crit_exit(); 911 break; 912 #endif 913 case TIOCNXCL: /* reset exclusive use of tty */ 914 crit_enter(); 915 CLR(tp->t_state, TS_XCLUDE); 916 crit_exit(); 917 break; 918 case TIOCOUTQ: /* output queue size */ 919 *(int *)data = tp->t_outq.c_cc; 920 break; 921 case TIOCSETA: /* set termios struct */ 922 case TIOCSETAW: /* drain output, set */ 923 case TIOCSETAF: { /* drn out, fls in, set */ 924 struct termios *t = (struct termios *)data; 925 926 if (t->c_ispeed == 0) 927 t->c_ispeed = t->c_ospeed; 928 if (t->c_ispeed == 0) 929 t->c_ispeed = tp->t_ospeed; 930 if (t->c_ispeed == 0) 931 return (EINVAL); 932 crit_enter(); 933 if (cmd == TIOCSETAW || cmd == TIOCSETAF) { 934 error = ttywait(tp); 935 if (error) { 936 crit_exit(); 937 return (error); 938 } 939 if (cmd == TIOCSETAF) 940 ttyflush(tp, FREAD); 941 } 942 if (!ISSET(t->c_cflag, CIGNORE)) { 943 /* 944 * Set device hardware. 945 */ 946 if (tp->t_param && (error = (*tp->t_param)(tp, t))) { 947 crit_exit(); 948 return (error); 949 } 950 if (ISSET(t->c_cflag, CLOCAL) && 951 !ISSET(tp->t_cflag, CLOCAL)) { 952 /* 953 * XXX disconnections would be too hard to 954 * get rid of without this kludge. The only 955 * way to get rid of controlling terminals 956 * is to exit from the session leader. 957 */ 958 CLR(tp->t_state, TS_ZOMBIE); 959 960 wakeup(TSA_CARR_ON(tp)); 961 ttwakeup(tp); 962 ttwwakeup(tp); 963 } 964 if ((ISSET(tp->t_state, TS_CARR_ON) || 965 ISSET(t->c_cflag, CLOCAL)) && 966 !ISSET(tp->t_state, TS_ZOMBIE)) 967 SET(tp->t_state, TS_CONNECTED); 968 else 969 CLR(tp->t_state, TS_CONNECTED); 970 tp->t_cflag = t->c_cflag; 971 tp->t_ispeed = t->c_ispeed; 972 if (t->c_ospeed != 0) 973 tp->t_ospeed = t->c_ospeed; 974 ttsetwater(tp); 975 } 976 if (ISSET(t->c_lflag, ICANON) != ISSET(tp->t_lflag, ICANON) && 977 cmd != TIOCSETAF) { 978 if (ISSET(t->c_lflag, ICANON)) 979 SET(tp->t_lflag, PENDIN); 980 else { 981 /* 982 * XXX we really shouldn't allow toggling 983 * ICANON while we're in a non-termios line 984 * discipline. Now we have to worry about 985 * panicing for a null queue. 986 */ 987 if (tp->t_canq.c_cbreserved > 0 && 988 tp->t_rawq.c_cbreserved > 0) { 989 catq(&tp->t_rawq, &tp->t_canq); 990 /* 991 * XXX the queue limits may be 992 * different, so the old queue 993 * swapping method no longer works. 994 */ 995 catq(&tp->t_canq, &tp->t_rawq); 996 } 997 CLR(tp->t_lflag, PENDIN); 998 } 999 ttwakeup(tp); 1000 } 1001 tp->t_iflag = t->c_iflag; 1002 tp->t_oflag = t->c_oflag; 1003 /* 1004 * Make the EXTPROC bit read only. 1005 */ 1006 if (ISSET(tp->t_lflag, EXTPROC)) 1007 SET(t->c_lflag, EXTPROC); 1008 else 1009 CLR(t->c_lflag, EXTPROC); 1010 tp->t_lflag = t->c_lflag | ISSET(tp->t_lflag, PENDIN); 1011 if (t->c_cc[VMIN] != tp->t_cc[VMIN] || 1012 t->c_cc[VTIME] != tp->t_cc[VTIME]) 1013 ttwakeup(tp); 1014 bcopy(t->c_cc, tp->t_cc, sizeof(t->c_cc)); 1015 crit_exit(); 1016 break; 1017 } 1018 case TIOCSETD: { /* set line discipline */ 1019 int t = *(int *)data; 1020 dev_t device = tp->t_dev; 1021 1022 if ((u_int)t >= nlinesw) 1023 return (ENXIO); 1024 if (t != tp->t_line) { 1025 crit_enter(); 1026 (*linesw[tp->t_line].l_close)(tp, flag); 1027 error = (*linesw[t].l_open)(device, tp); 1028 if (error) { 1029 (void)(*linesw[tp->t_line].l_open)(device, tp); 1030 crit_exit(); 1031 return (error); 1032 } 1033 tp->t_line = t; 1034 crit_exit(); 1035 } 1036 break; 1037 } 1038 case TIOCSTART: /* start output, like ^Q */ 1039 crit_enter(); 1040 if (ISSET(tp->t_state, TS_TTSTOP) || 1041 ISSET(tp->t_lflag, FLUSHO)) { 1042 CLR(tp->t_lflag, FLUSHO); 1043 CLR(tp->t_state, TS_TTSTOP); 1044 ttstart(tp); 1045 } 1046 crit_exit(); 1047 break; 1048 case TIOCSTI: /* simulate terminal input */ 1049 if ((flag & FREAD) == 0 && suser(td)) 1050 return (EPERM); 1051 if (!isctty(p, tp) && suser(td)) 1052 return (EACCES); 1053 crit_enter(); 1054 (*linesw[tp->t_line].l_rint)(*(u_char *)data, tp); 1055 crit_exit(); 1056 break; 1057 case TIOCSTOP: /* stop output, like ^S */ 1058 crit_enter(); 1059 if (!ISSET(tp->t_state, TS_TTSTOP)) { 1060 SET(tp->t_state, TS_TTSTOP); 1061 (*tp->t_stop)(tp, 0); 1062 } 1063 crit_exit(); 1064 break; 1065 case TIOCSCTTY: /* become controlling tty */ 1066 /* Session ctty vnode pointer set in vnode layer. */ 1067 if (!SESS_LEADER(p) || 1068 ((p->p_session->s_ttyvp || tp->t_session) && 1069 (tp->t_session != p->p_session))) 1070 return (EPERM); 1071 tp->t_session = p->p_session; 1072 tp->t_pgrp = p->p_pgrp; 1073 p->p_session->s_ttyp = tp; 1074 p->p_flag |= P_CONTROLT; 1075 break; 1076 case TIOCSPGRP: { /* set pgrp of tty */ 1077 struct pgrp *pgrp = pgfind(*(int *)data); 1078 1079 if (!isctty(p, tp)) 1080 return (ENOTTY); 1081 else if (pgrp == NULL || pgrp->pg_session != p->p_session) 1082 return (EPERM); 1083 tp->t_pgrp = pgrp; 1084 break; 1085 } 1086 case TIOCSTAT: /* simulate control-T */ 1087 crit_enter(); 1088 ttyinfo(tp); 1089 crit_exit(); 1090 break; 1091 case TIOCSWINSZ: /* set window size */ 1092 if (bcmp((caddr_t)&tp->t_winsize, data, 1093 sizeof (struct winsize))) { 1094 tp->t_winsize = *(struct winsize *)data; 1095 pgsignal(tp->t_pgrp, SIGWINCH, 1); 1096 } 1097 break; 1098 case TIOCSDRAINWAIT: 1099 error = suser(td); 1100 if (error) 1101 return (error); 1102 tp->t_timeout = *(int *)data * hz; 1103 wakeup(TSA_OCOMPLETE(tp)); 1104 wakeup(TSA_OLOWAT(tp)); 1105 break; 1106 case TIOCGDRAINWAIT: 1107 *(int *)data = tp->t_timeout / hz; 1108 break; 1109 default: 1110 #if defined(COMPAT_43) || defined(COMPAT_SUNOS) 1111 return (ttcompat(tp, cmd, data, flag)); 1112 #else 1113 return (ENOIOCTL); 1114 #endif 1115 } 1116 return (0); 1117 } 1118 1119 int 1120 ttypoll(struct dev_poll_args *ap) 1121 { 1122 dev_t dev = ap->a_head.a_dev; 1123 int events = ap->a_events; 1124 int revents = 0; 1125 struct tty *tp; 1126 1127 tp = dev->si_tty; 1128 /* XXX used to return ENXIO, but that means true! */ 1129 if (tp == NULL) { 1130 ap->a_events = (events & (POLLIN | POLLOUT | POLLRDNORM | 1131 POLLWRNORM)) | POLLHUP; 1132 return(0); 1133 } 1134 1135 crit_enter(); 1136 if (events & (POLLIN | POLLRDNORM)) { 1137 if (ttnread(tp) > 0 || ISSET(tp->t_state, TS_ZOMBIE)) 1138 revents |= events & (POLLIN | POLLRDNORM); 1139 else 1140 selrecord(curthread, &tp->t_rsel); 1141 } 1142 if (events & (POLLOUT | POLLWRNORM)) { 1143 if ((tp->t_outq.c_cc <= tp->t_olowat && 1144 ISSET(tp->t_state, TS_CONNECTED)) 1145 || ISSET(tp->t_state, TS_ZOMBIE)) 1146 revents |= events & (POLLOUT | POLLWRNORM); 1147 else 1148 selrecord(curthread, &tp->t_wsel); 1149 } 1150 crit_exit(); 1151 ap->a_events = revents; 1152 return (0); 1153 } 1154 1155 static struct filterops ttyread_filtops = 1156 { 1, NULL, filt_ttyrdetach, filt_ttyread }; 1157 static struct filterops ttywrite_filtops = 1158 { 1, NULL, filt_ttywdetach, filt_ttywrite }; 1159 1160 int 1161 ttykqfilter(struct dev_kqfilter_args *ap) 1162 { 1163 dev_t dev = ap->a_head.a_dev; 1164 struct knote *kn = ap->a_kn; 1165 struct tty *tp = dev->si_tty; 1166 struct klist *klist; 1167 1168 ap->a_result = 0; 1169 switch (kn->kn_filter) { 1170 case EVFILT_READ: 1171 klist = &tp->t_rsel.si_note; 1172 kn->kn_fop = &ttyread_filtops; 1173 break; 1174 case EVFILT_WRITE: 1175 klist = &tp->t_wsel.si_note; 1176 kn->kn_fop = &ttywrite_filtops; 1177 break; 1178 default: 1179 ap->a_result = 1; 1180 return (0); 1181 } 1182 1183 kn->kn_hook = (caddr_t)dev; 1184 1185 crit_enter(); 1186 SLIST_INSERT_HEAD(klist, kn, kn_selnext); 1187 crit_exit(); 1188 1189 return (0); 1190 } 1191 1192 static void 1193 filt_ttyrdetach(struct knote *kn) 1194 { 1195 struct tty *tp = ((dev_t)kn->kn_hook)->si_tty; 1196 1197 crit_enter(); 1198 SLIST_REMOVE(&tp->t_rsel.si_note, kn, knote, kn_selnext); 1199 crit_exit(); 1200 } 1201 1202 static int 1203 filt_ttyread(struct knote *kn, long hint) 1204 { 1205 struct tty *tp = ((dev_t)kn->kn_hook)->si_tty; 1206 1207 kn->kn_data = ttnread(tp); 1208 if (ISSET(tp->t_state, TS_ZOMBIE)) { 1209 kn->kn_flags |= EV_EOF; 1210 return (1); 1211 } 1212 return (kn->kn_data > 0); 1213 } 1214 1215 static void 1216 filt_ttywdetach(struct knote *kn) 1217 { 1218 struct tty *tp = ((dev_t)kn->kn_hook)->si_tty; 1219 1220 crit_enter(); 1221 SLIST_REMOVE(&tp->t_wsel.si_note, kn, knote, kn_selnext); 1222 crit_exit(); 1223 } 1224 1225 static int 1226 filt_ttywrite(kn, hint) 1227 struct knote *kn; 1228 long hint; 1229 { 1230 struct tty *tp = ((dev_t)kn->kn_hook)->si_tty; 1231 1232 kn->kn_data = tp->t_outq.c_cc; 1233 if (ISSET(tp->t_state, TS_ZOMBIE)) 1234 return (1); 1235 return (kn->kn_data <= tp->t_olowat && 1236 ISSET(tp->t_state, TS_CONNECTED)); 1237 } 1238 1239 /* 1240 * Must be called while in a critical section. 1241 */ 1242 static int 1243 ttnread(tp) 1244 struct tty *tp; 1245 { 1246 int nread; 1247 1248 if (ISSET(tp->t_lflag, PENDIN)) 1249 ttypend(tp); 1250 nread = tp->t_canq.c_cc; 1251 if (!ISSET(tp->t_lflag, ICANON)) { 1252 nread += tp->t_rawq.c_cc; 1253 if (nread < tp->t_cc[VMIN] && tp->t_cc[VTIME] == 0) 1254 nread = 0; 1255 } 1256 return (nread); 1257 } 1258 1259 /* 1260 * Wait for output to drain. 1261 */ 1262 int 1263 ttywait(tp) 1264 struct tty *tp; 1265 { 1266 int error; 1267 1268 error = 0; 1269 crit_enter(); 1270 while ((tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY)) && 1271 ISSET(tp->t_state, TS_CONNECTED) && tp->t_oproc) { 1272 (*tp->t_oproc)(tp); 1273 if ((tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY)) && 1274 ISSET(tp->t_state, TS_CONNECTED)) { 1275 SET(tp->t_state, TS_SO_OCOMPLETE); 1276 error = ttysleep(tp, TSA_OCOMPLETE(tp), 1277 PCATCH, "ttywai", 1278 tp->t_timeout); 1279 if (error) { 1280 if (error == EWOULDBLOCK) 1281 error = EIO; 1282 break; 1283 } 1284 } else 1285 break; 1286 } 1287 if (!error && (tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY))) 1288 error = EIO; 1289 crit_exit(); 1290 return (error); 1291 } 1292 1293 /* 1294 * Flush if successfully wait. 1295 */ 1296 static int 1297 ttywflush(tp) 1298 struct tty *tp; 1299 { 1300 int error; 1301 1302 if ((error = ttywait(tp)) == 0) 1303 ttyflush(tp, FREAD); 1304 return (error); 1305 } 1306 1307 /* 1308 * Flush tty read and/or write queues, notifying anyone waiting. 1309 */ 1310 void 1311 ttyflush(tp, rw) 1312 struct tty *tp; 1313 int rw; 1314 { 1315 crit_enter(); 1316 #if 0 1317 again: 1318 #endif 1319 if (rw & FWRITE) { 1320 FLUSHQ(&tp->t_outq); 1321 CLR(tp->t_state, TS_TTSTOP); 1322 } 1323 (*tp->t_stop)(tp, rw); 1324 if (rw & FREAD) { 1325 FLUSHQ(&tp->t_canq); 1326 FLUSHQ(&tp->t_rawq); 1327 CLR(tp->t_lflag, PENDIN); 1328 tp->t_rocount = 0; 1329 tp->t_rocol = 0; 1330 CLR(tp->t_state, TS_LOCAL); 1331 ttwakeup(tp); 1332 if (ISSET(tp->t_state, TS_TBLOCK)) { 1333 if (rw & FWRITE) 1334 FLUSHQ(&tp->t_outq); 1335 ttyunblock(tp); 1336 1337 /* 1338 * Don't let leave any state that might clobber the 1339 * next line discipline (although we should do more 1340 * to send the START char). Not clearing the state 1341 * may have caused the "putc to a clist with no 1342 * reserved cblocks" panic/printf. 1343 */ 1344 CLR(tp->t_state, TS_TBLOCK); 1345 1346 #if 0 /* forget it, sleeping isn't always safe and we don't know when it is */ 1347 if (ISSET(tp->t_iflag, IXOFF)) { 1348 /* 1349 * XXX wait a bit in the hope that the stop 1350 * character (if any) will go out. Waiting 1351 * isn't good since it allows races. This 1352 * will be fixed when the stop character is 1353 * put in a special queue. Don't bother with 1354 * the checks in ttywait() since the timeout 1355 * will save us. 1356 */ 1357 SET(tp->t_state, TS_SO_OCOMPLETE); 1358 ttysleep(tp, TSA_OCOMPLETE(tp), 0, 1359 "ttyfls", hz / 10); 1360 /* 1361 * Don't try sending the stop character again. 1362 */ 1363 CLR(tp->t_state, TS_TBLOCK); 1364 goto again; 1365 } 1366 #endif 1367 } 1368 } 1369 if (rw & FWRITE) { 1370 FLUSHQ(&tp->t_outq); 1371 ttwwakeup(tp); 1372 } 1373 crit_exit(); 1374 } 1375 1376 /* 1377 * Copy in the default termios characters. 1378 */ 1379 void 1380 termioschars(t) 1381 struct termios *t; 1382 { 1383 1384 bcopy(ttydefchars, t->c_cc, sizeof t->c_cc); 1385 } 1386 1387 /* 1388 * Old interface. 1389 */ 1390 void 1391 ttychars(tp) 1392 struct tty *tp; 1393 { 1394 1395 termioschars(&tp->t_termios); 1396 } 1397 1398 /* 1399 * Handle input high water. Send stop character for the IXOFF case. Turn 1400 * on our input flow control bit and propagate the changes to the driver. 1401 * XXX the stop character should be put in a special high priority queue. 1402 */ 1403 void 1404 ttyblock(tp) 1405 struct tty *tp; 1406 { 1407 1408 SET(tp->t_state, TS_TBLOCK); 1409 if (ISSET(tp->t_iflag, IXOFF) && tp->t_cc[VSTOP] != _POSIX_VDISABLE && 1410 putc(tp->t_cc[VSTOP], &tp->t_outq) != 0) 1411 CLR(tp->t_state, TS_TBLOCK); /* try again later */ 1412 ttstart(tp); 1413 } 1414 1415 /* 1416 * Handle input low water. Send start character for the IXOFF case. Turn 1417 * off our input flow control bit and propagate the changes to the driver. 1418 * XXX the start character should be put in a special high priority queue. 1419 */ 1420 static void 1421 ttyunblock(tp) 1422 struct tty *tp; 1423 { 1424 1425 CLR(tp->t_state, TS_TBLOCK); 1426 if (ISSET(tp->t_iflag, IXOFF) && tp->t_cc[VSTART] != _POSIX_VDISABLE && 1427 putc(tp->t_cc[VSTART], &tp->t_outq) != 0) 1428 SET(tp->t_state, TS_TBLOCK); /* try again later */ 1429 ttstart(tp); 1430 } 1431 1432 #ifdef notyet 1433 /* Not used by any current (i386) drivers. */ 1434 /* 1435 * Restart after an inter-char delay. 1436 */ 1437 void 1438 ttrstrt(tp_arg) 1439 void *tp_arg; 1440 { 1441 struct tty *tp; 1442 1443 KASSERT(tp_arg != NULL, ("ttrstrt")); 1444 1445 tp = tp_arg; 1446 crit_enter(); 1447 CLR(tp->t_state, TS_TIMEOUT); 1448 ttstart(tp); 1449 crit_exit(); 1450 } 1451 #endif 1452 1453 int 1454 ttstart(tp) 1455 struct tty *tp; 1456 { 1457 1458 if (tp->t_oproc != NULL) /* XXX: Kludge for pty. */ 1459 (*tp->t_oproc)(tp); 1460 return (0); 1461 } 1462 1463 /* 1464 * "close" a line discipline 1465 */ 1466 int 1467 ttylclose(tp, flag) 1468 struct tty *tp; 1469 int flag; 1470 { 1471 1472 if (flag & FNONBLOCK || ttywflush(tp)) 1473 ttyflush(tp, FREAD | FWRITE); 1474 return (0); 1475 } 1476 1477 /* 1478 * Handle modem control transition on a tty. 1479 * Flag indicates new state of carrier. 1480 * Returns 0 if the line should be turned off, otherwise 1. 1481 */ 1482 int 1483 ttymodem(tp, flag) 1484 struct tty *tp; 1485 int flag; 1486 { 1487 1488 if (ISSET(tp->t_state, TS_CARR_ON) && ISSET(tp->t_cflag, MDMBUF)) { 1489 /* 1490 * MDMBUF: do flow control according to carrier flag 1491 * XXX TS_CAR_OFLOW doesn't do anything yet. TS_TTSTOP 1492 * works if IXON and IXANY are clear. 1493 */ 1494 if (flag) { 1495 CLR(tp->t_state, TS_CAR_OFLOW); 1496 CLR(tp->t_state, TS_TTSTOP); 1497 ttstart(tp); 1498 } else if (!ISSET(tp->t_state, TS_CAR_OFLOW)) { 1499 SET(tp->t_state, TS_CAR_OFLOW); 1500 SET(tp->t_state, TS_TTSTOP); 1501 (*tp->t_stop)(tp, 0); 1502 } 1503 } else if (flag == 0) { 1504 /* 1505 * Lost carrier. 1506 */ 1507 CLR(tp->t_state, TS_CARR_ON); 1508 if (ISSET(tp->t_state, TS_ISOPEN) && 1509 !ISSET(tp->t_cflag, CLOCAL)) { 1510 SET(tp->t_state, TS_ZOMBIE); 1511 CLR(tp->t_state, TS_CONNECTED); 1512 if (tp->t_session && tp->t_session->s_leader) 1513 psignal(tp->t_session->s_leader, SIGHUP); 1514 ttyflush(tp, FREAD | FWRITE); 1515 return (0); 1516 } 1517 } else { 1518 /* 1519 * Carrier now on. 1520 */ 1521 SET(tp->t_state, TS_CARR_ON); 1522 if (!ISSET(tp->t_state, TS_ZOMBIE)) 1523 SET(tp->t_state, TS_CONNECTED); 1524 wakeup(TSA_CARR_ON(tp)); 1525 ttwakeup(tp); 1526 ttwwakeup(tp); 1527 } 1528 return (1); 1529 } 1530 1531 /* 1532 * Reinput pending characters after state switch 1533 * call from a critical section. 1534 */ 1535 static void 1536 ttypend(tp) 1537 struct tty *tp; 1538 { 1539 struct clist tq; 1540 int c; 1541 1542 CLR(tp->t_lflag, PENDIN); 1543 SET(tp->t_state, TS_TYPEN); 1544 /* 1545 * XXX this assumes too much about clist internals. It may even 1546 * fail if the cblock slush pool is empty. We can't allocate more 1547 * cblocks here because we are called from an interrupt handler 1548 * and clist_alloc_cblocks() can wait. 1549 */ 1550 tq = tp->t_rawq; 1551 bzero(&tp->t_rawq, sizeof tp->t_rawq); 1552 tp->t_rawq.c_cbmax = tq.c_cbmax; 1553 tp->t_rawq.c_cbreserved = tq.c_cbreserved; 1554 while ((c = getc(&tq)) >= 0) 1555 ttyinput(c, tp); 1556 CLR(tp->t_state, TS_TYPEN); 1557 } 1558 1559 /* 1560 * Process a read call on a tty device. 1561 */ 1562 int 1563 ttread(tp, uio, flag) 1564 struct tty *tp; 1565 struct uio *uio; 1566 int flag; 1567 { 1568 struct clist *qp; 1569 int c; 1570 tcflag_t lflag; 1571 cc_t *cc = tp->t_cc; 1572 struct proc *pp; 1573 int first, error = 0; 1574 int has_stime = 0, last_cc = 0; 1575 long slp = 0; /* XXX this should be renamed `timo'. */ 1576 struct timeval stime; 1577 1578 loop: 1579 crit_enter(); 1580 lflag = tp->t_lflag; 1581 /* 1582 * take pending input first 1583 */ 1584 if (ISSET(lflag, PENDIN)) { 1585 ttypend(tp); 1586 splz(); /* reduce latency */ 1587 lflag = tp->t_lflag; /* XXX ttypend() clobbers it */ 1588 } 1589 1590 /* 1591 * Hang process if it's in the background. 1592 */ 1593 if ((pp = curproc) && isbackground(pp, tp)) { 1594 crit_exit(); 1595 if (SIGISMEMBER(pp->p_sigignore, SIGTTIN) || 1596 SIGISMEMBER(pp->p_sigmask, SIGTTIN) || 1597 (pp->p_flag & P_PPWAIT) || pp->p_pgrp->pg_jobc == 0) 1598 return (EIO); 1599 pgsignal(pp->p_pgrp, SIGTTIN, 1); 1600 error = ttysleep(tp, &lbolt, PCATCH, "ttybg2", 0); 1601 if (error) 1602 return (error); 1603 goto loop; 1604 } 1605 1606 if (ISSET(tp->t_state, TS_ZOMBIE)) { 1607 crit_exit(); 1608 return (0); /* EOF */ 1609 } 1610 1611 /* 1612 * If canonical, use the canonical queue, 1613 * else use the raw queue. 1614 * 1615 * (should get rid of clists...) 1616 */ 1617 qp = ISSET(lflag, ICANON) ? &tp->t_canq : &tp->t_rawq; 1618 1619 if (flag & IO_NDELAY) { 1620 if (qp->c_cc > 0) 1621 goto read; 1622 if (!ISSET(lflag, ICANON) && cc[VMIN] == 0) { 1623 crit_exit(); 1624 return (0); 1625 } 1626 crit_exit(); 1627 return (EWOULDBLOCK); 1628 } 1629 if (!ISSET(lflag, ICANON)) { 1630 int m = cc[VMIN]; 1631 long t = cc[VTIME]; 1632 struct timeval timecopy; 1633 1634 /* 1635 * Check each of the four combinations. 1636 * (m > 0 && t == 0) is the normal read case. 1637 * It should be fairly efficient, so we check that and its 1638 * companion case (m == 0 && t == 0) first. 1639 * For the other two cases, we compute the target sleep time 1640 * into slp. 1641 */ 1642 if (t == 0) { 1643 if (qp->c_cc < m) 1644 goto sleep; 1645 if (qp->c_cc > 0) 1646 goto read; 1647 1648 /* m, t and qp->c_cc are all 0. 0 is enough input. */ 1649 crit_exit(); 1650 return (0); 1651 } 1652 t *= 100000; /* time in us */ 1653 #define diff(t1, t2) (((t1).tv_sec - (t2).tv_sec) * 1000000 + \ 1654 ((t1).tv_usec - (t2).tv_usec)) 1655 if (m > 0) { 1656 if (qp->c_cc <= 0) 1657 goto sleep; 1658 if (qp->c_cc >= m) 1659 goto read; 1660 getmicrotime(&timecopy); 1661 if (!has_stime) { 1662 /* first character, start timer */ 1663 has_stime = 1; 1664 stime = timecopy; 1665 slp = t; 1666 } else if (qp->c_cc > last_cc) { 1667 /* got a character, restart timer */ 1668 stime = timecopy; 1669 slp = t; 1670 } else { 1671 /* nothing, check expiration */ 1672 slp = t - diff(timecopy, stime); 1673 if (slp <= 0) 1674 goto read; 1675 } 1676 last_cc = qp->c_cc; 1677 } else { /* m == 0 */ 1678 if (qp->c_cc > 0) 1679 goto read; 1680 getmicrotime(&timecopy); 1681 if (!has_stime) { 1682 has_stime = 1; 1683 stime = timecopy; 1684 slp = t; 1685 } else { 1686 slp = t - diff(timecopy, stime); 1687 if (slp <= 0) { 1688 /* Timed out, but 0 is enough input. */ 1689 crit_exit(); 1690 return (0); 1691 } 1692 } 1693 } 1694 #undef diff 1695 /* 1696 * Rounding down may make us wake up just short 1697 * of the target, so we round up. 1698 * The formula is ceiling(slp * hz/1000000). 1699 * 32-bit arithmetic is enough for hz < 169. 1700 * XXX see tvtohz() for how to avoid overflow if hz 1701 * is large (divide by `tick' and/or arrange to 1702 * use tvtohz() if hz is large). 1703 */ 1704 slp = (long) (((u_long)slp * hz) + 999999) / 1000000; 1705 goto sleep; 1706 } 1707 if (qp->c_cc <= 0) { 1708 sleep: 1709 /* 1710 * There is no input, or not enough input and we can block. 1711 */ 1712 error = ttysleep(tp, TSA_HUP_OR_INPUT(tp), PCATCH, 1713 ISSET(tp->t_state, TS_CONNECTED) ? 1714 "ttyin" : "ttyhup", (int)slp); 1715 crit_exit(); 1716 if (error == EWOULDBLOCK) 1717 error = 0; 1718 else if (error) 1719 return (error); 1720 /* 1721 * XXX what happens if another process eats some input 1722 * while we are asleep (not just here)? It would be 1723 * safest to detect changes and reset our state variables 1724 * (has_stime and last_cc). 1725 */ 1726 slp = 0; 1727 goto loop; 1728 } 1729 read: 1730 crit_exit(); 1731 /* 1732 * Input present, check for input mapping and processing. 1733 */ 1734 first = 1; 1735 if (ISSET(lflag, ICANON | ISIG)) 1736 goto slowcase; 1737 for (;;) { 1738 char ibuf[IBUFSIZ]; 1739 int icc; 1740 1741 icc = imin(uio->uio_resid, IBUFSIZ); 1742 icc = q_to_b(qp, ibuf, icc); 1743 if (icc <= 0) { 1744 if (first) 1745 goto loop; 1746 break; 1747 } 1748 error = uiomove(ibuf, icc, uio); 1749 /* 1750 * XXX if there was an error then we should ungetc() the 1751 * unmoved chars and reduce icc here. 1752 */ 1753 if (error) 1754 break; 1755 if (uio->uio_resid == 0) 1756 break; 1757 first = 0; 1758 } 1759 goto out; 1760 slowcase: 1761 for (;;) { 1762 c = getc(qp); 1763 if (c < 0) { 1764 if (first) 1765 goto loop; 1766 break; 1767 } 1768 /* 1769 * delayed suspend (^Y) 1770 */ 1771 if (CCEQ(cc[VDSUSP], c) && 1772 ISSET(lflag, IEXTEN | ISIG) == (IEXTEN | ISIG)) { 1773 pgsignal(tp->t_pgrp, SIGTSTP, 1); 1774 if (first) { 1775 error = ttysleep(tp, &lbolt, PCATCH, 1776 "ttybg3", 0); 1777 if (error) 1778 break; 1779 goto loop; 1780 } 1781 break; 1782 } 1783 /* 1784 * Interpret EOF only in canonical mode. 1785 */ 1786 if (CCEQ(cc[VEOF], c) && ISSET(lflag, ICANON)) 1787 break; 1788 /* 1789 * Give user character. 1790 */ 1791 error = ureadc(c, uio); 1792 if (error) 1793 /* XXX should ungetc(c, qp). */ 1794 break; 1795 if (uio->uio_resid == 0) 1796 break; 1797 /* 1798 * In canonical mode check for a "break character" 1799 * marking the end of a "line of input". 1800 */ 1801 if (ISSET(lflag, ICANON) && TTBREAKC(c, lflag)) 1802 break; 1803 first = 0; 1804 } 1805 1806 out: 1807 /* 1808 * Look to unblock input now that (presumably) 1809 * the input queue has gone down. 1810 */ 1811 crit_enter(); 1812 if (ISSET(tp->t_state, TS_TBLOCK) && 1813 tp->t_rawq.c_cc + tp->t_canq.c_cc <= tp->t_ilowat) 1814 ttyunblock(tp); 1815 crit_exit(); 1816 1817 return (error); 1818 } 1819 1820 /* 1821 * Check the output queue on tp for space for a kernel message (from uprintf 1822 * or tprintf). Allow some space over the normal hiwater mark so we don't 1823 * lose messages due to normal flow control, but don't let the tty run amok. 1824 * Sleeps here are not interruptible, but we return prematurely if new signals 1825 * arrive. 1826 */ 1827 int 1828 ttycheckoutq(tp, wait) 1829 struct tty *tp; 1830 int wait; 1831 { 1832 int hiwat; 1833 sigset_t oldmask; 1834 1835 hiwat = tp->t_ohiwat; 1836 SIGEMPTYSET(oldmask); 1837 crit_enter(); 1838 if (wait) 1839 oldmask = curproc->p_siglist; 1840 if (tp->t_outq.c_cc > hiwat + OBUFSIZ + 100) { 1841 while (tp->t_outq.c_cc > hiwat) { 1842 ttstart(tp); 1843 if (tp->t_outq.c_cc <= hiwat) 1844 break; 1845 if (!(wait && SIGSETEQ(curproc->p_siglist, oldmask))) { 1846 crit_exit(); 1847 return (0); 1848 } 1849 SET(tp->t_state, TS_SO_OLOWAT); 1850 tsleep(TSA_OLOWAT(tp), 0, "ttoutq", hz); 1851 } 1852 } 1853 crit_exit(); 1854 return (1); 1855 } 1856 1857 /* 1858 * Process a write call on a tty device. 1859 */ 1860 int 1861 ttwrite(tp, uio, flag) 1862 struct tty *tp; 1863 struct uio *uio; 1864 int flag; 1865 { 1866 char *cp = NULL; 1867 int cc, ce; 1868 struct proc *pp; 1869 int i, hiwat, cnt, error; 1870 char obuf[OBUFSIZ]; 1871 1872 hiwat = tp->t_ohiwat; 1873 cnt = uio->uio_resid; 1874 error = 0; 1875 cc = 0; 1876 loop: 1877 crit_enter(); 1878 if (ISSET(tp->t_state, TS_ZOMBIE)) { 1879 crit_exit(); 1880 if (uio->uio_resid == cnt) 1881 error = EIO; 1882 goto out; 1883 } 1884 if (!ISSET(tp->t_state, TS_CONNECTED)) { 1885 if (flag & IO_NDELAY) { 1886 crit_exit(); 1887 error = EWOULDBLOCK; 1888 goto out; 1889 } 1890 error = ttysleep(tp, TSA_CARR_ON(tp), PCATCH, "ttydcd", 0); 1891 crit_exit(); 1892 if (error) 1893 goto out; 1894 goto loop; 1895 } 1896 crit_exit(); 1897 1898 /* 1899 * Hang the process if it's in the background. 1900 */ 1901 if ((pp = curproc) && isbackground(pp, tp) && 1902 ISSET(tp->t_lflag, TOSTOP) && !(pp->p_flag & P_PPWAIT) && 1903 !SIGISMEMBER(pp->p_sigignore, SIGTTOU) && 1904 !SIGISMEMBER(pp->p_sigmask, SIGTTOU)) { 1905 if (pp->p_pgrp->pg_jobc == 0) { 1906 error = EIO; 1907 goto out; 1908 } 1909 pgsignal(pp->p_pgrp, SIGTTOU, 1); 1910 error = ttysleep(tp, &lbolt, PCATCH, "ttybg4", 0); 1911 if (error) 1912 goto out; 1913 goto loop; 1914 } 1915 /* 1916 * Process the user's data in at most OBUFSIZ chunks. Perform any 1917 * output translation. Keep track of high water mark, sleep on 1918 * overflow awaiting device aid in acquiring new space. 1919 */ 1920 while (uio->uio_resid > 0 || cc > 0) { 1921 if (ISSET(tp->t_lflag, FLUSHO)) { 1922 uio->uio_resid = 0; 1923 return (0); 1924 } 1925 if (tp->t_outq.c_cc > hiwat) 1926 goto ovhiwat; 1927 /* 1928 * Grab a hunk of data from the user, unless we have some 1929 * leftover from last time. 1930 */ 1931 if (cc == 0) { 1932 cc = imin(uio->uio_resid, OBUFSIZ); 1933 cp = obuf; 1934 error = uiomove(cp, cc, uio); 1935 if (error) { 1936 cc = 0; 1937 break; 1938 } 1939 } 1940 /* 1941 * If nothing fancy need be done, grab those characters we 1942 * can handle without any of ttyoutput's processing and 1943 * just transfer them to the output q. For those chars 1944 * which require special processing (as indicated by the 1945 * bits in char_type), call ttyoutput. After processing 1946 * a hunk of data, look for FLUSHO so ^O's will take effect 1947 * immediately. 1948 */ 1949 while (cc > 0) { 1950 if (!ISSET(tp->t_oflag, OPOST)) 1951 ce = cc; 1952 else { 1953 ce = cc - scanc((u_int)cc, (u_char *)cp, 1954 char_type, CCLASSMASK); 1955 /* 1956 * If ce is zero, then we're processing 1957 * a special character through ttyoutput. 1958 */ 1959 if (ce == 0) { 1960 tp->t_rocount = 0; 1961 if (ttyoutput(*cp, tp) >= 0) { 1962 /* No Clists, wait a bit. */ 1963 ttstart(tp); 1964 if (flag & IO_NDELAY) { 1965 error = EWOULDBLOCK; 1966 goto out; 1967 } 1968 error = ttysleep(tp, &lbolt, 1969 PCATCH, 1970 "ttybf1", 0); 1971 if (error) 1972 goto out; 1973 goto loop; 1974 } 1975 cp++; 1976 cc--; 1977 if (ISSET(tp->t_lflag, FLUSHO) || 1978 tp->t_outq.c_cc > hiwat) 1979 goto ovhiwat; 1980 continue; 1981 } 1982 } 1983 /* 1984 * A bunch of normal characters have been found. 1985 * Transfer them en masse to the output queue and 1986 * continue processing at the top of the loop. 1987 * If there are any further characters in this 1988 * <= OBUFSIZ chunk, the first should be a character 1989 * requiring special handling by ttyoutput. 1990 */ 1991 tp->t_rocount = 0; 1992 i = b_to_q(cp, ce, &tp->t_outq); 1993 ce -= i; 1994 tp->t_column += ce; 1995 cp += ce, cc -= ce, tk_nout += ce; 1996 tp->t_outcc += ce; 1997 if (i > 0) { 1998 /* No Clists, wait a bit. */ 1999 ttstart(tp); 2000 if (flag & IO_NDELAY) { 2001 error = EWOULDBLOCK; 2002 goto out; 2003 } 2004 error = ttysleep(tp, &lbolt, PCATCH, 2005 "ttybf2", 0); 2006 if (error) 2007 goto out; 2008 goto loop; 2009 } 2010 if (ISSET(tp->t_lflag, FLUSHO) || 2011 tp->t_outq.c_cc > hiwat) 2012 break; 2013 } 2014 ttstart(tp); 2015 } 2016 out: 2017 /* 2018 * If cc is nonzero, we leave the uio structure inconsistent, as the 2019 * offset and iov pointers have moved forward, but it doesn't matter 2020 * (the call will either return short or restart with a new uio). 2021 */ 2022 uio->uio_resid += cc; 2023 return (error); 2024 2025 ovhiwat: 2026 ttstart(tp); 2027 crit_enter(); 2028 /* 2029 * This can only occur if FLUSHO is set in t_lflag, 2030 * or if ttstart/oproc is synchronous (or very fast). 2031 */ 2032 if (tp->t_outq.c_cc <= hiwat) { 2033 crit_exit(); 2034 goto loop; 2035 } 2036 if (flag & IO_NDELAY) { 2037 crit_exit(); 2038 uio->uio_resid += cc; 2039 return (uio->uio_resid == cnt ? EWOULDBLOCK : 0); 2040 } 2041 SET(tp->t_state, TS_SO_OLOWAT); 2042 error = ttysleep(tp, TSA_OLOWAT(tp), PCATCH, "ttywri", tp->t_timeout); 2043 crit_exit(); 2044 if (error == EWOULDBLOCK) 2045 error = EIO; 2046 if (error) 2047 goto out; 2048 goto loop; 2049 } 2050 2051 /* 2052 * Rubout one character from the rawq of tp 2053 * as cleanly as possible. 2054 */ 2055 static void 2056 ttyrub(c, tp) 2057 int c; 2058 struct tty *tp; 2059 { 2060 char *cp; 2061 int savecol; 2062 int tabc; 2063 2064 if (!ISSET(tp->t_lflag, ECHO) || ISSET(tp->t_lflag, EXTPROC)) 2065 return; 2066 CLR(tp->t_lflag, FLUSHO); 2067 if (ISSET(tp->t_lflag, ECHOE)) { 2068 if (tp->t_rocount == 0) { 2069 /* 2070 * Screwed by ttwrite; retype 2071 */ 2072 ttyretype(tp); 2073 return; 2074 } 2075 if (c == ('\t' | TTY_QUOTE) || c == ('\n' | TTY_QUOTE)) 2076 ttyrubo(tp, 2); 2077 else { 2078 CLR(c, ~TTY_CHARMASK); 2079 switch (CCLASS(c)) { 2080 case ORDINARY: 2081 ttyrubo(tp, 1); 2082 break; 2083 case BACKSPACE: 2084 case CONTROL: 2085 case NEWLINE: 2086 case RETURN: 2087 case VTAB: 2088 if (ISSET(tp->t_lflag, ECHOCTL)) 2089 ttyrubo(tp, 2); 2090 break; 2091 case TAB: 2092 if (tp->t_rocount < tp->t_rawq.c_cc) { 2093 ttyretype(tp); 2094 return; 2095 } 2096 crit_enter(); 2097 savecol = tp->t_column; 2098 SET(tp->t_state, TS_CNTTB); 2099 SET(tp->t_lflag, FLUSHO); 2100 tp->t_column = tp->t_rocol; 2101 cp = tp->t_rawq.c_cf; 2102 if (cp) 2103 tabc = *cp; /* XXX FIX NEXTC */ 2104 for (; cp; cp = nextc(&tp->t_rawq, cp, &tabc)) 2105 ttyecho(tabc, tp); 2106 CLR(tp->t_lflag, FLUSHO); 2107 CLR(tp->t_state, TS_CNTTB); 2108 crit_exit(); 2109 2110 /* savecol will now be length of the tab. */ 2111 savecol -= tp->t_column; 2112 tp->t_column += savecol; 2113 if (savecol > 8) 2114 savecol = 8; /* overflow screw */ 2115 while (--savecol >= 0) 2116 (void)ttyoutput('\b', tp); 2117 break; 2118 default: /* XXX */ 2119 #define PANICSTR "ttyrub: would panic c = %d, val = %d\n" 2120 (void)printf(PANICSTR, c, CCLASS(c)); 2121 #ifdef notdef 2122 panic(PANICSTR, c, CCLASS(c)); 2123 #endif 2124 } 2125 } 2126 } else if (ISSET(tp->t_lflag, ECHOPRT)) { 2127 if (!ISSET(tp->t_state, TS_ERASE)) { 2128 SET(tp->t_state, TS_ERASE); 2129 (void)ttyoutput('\\', tp); 2130 } 2131 ttyecho(c, tp); 2132 } else { 2133 ttyecho(tp->t_cc[VERASE], tp); 2134 /* 2135 * This code may be executed not only when an ERASE key 2136 * is pressed, but also when ^U (KILL) or ^W (WERASE) are. 2137 * So, I didn't think it was worthwhile to pass the extra 2138 * information (which would need an extra parameter, 2139 * changing every call) needed to distinguish the ERASE2 2140 * case from the ERASE. 2141 */ 2142 } 2143 --tp->t_rocount; 2144 } 2145 2146 /* 2147 * Back over cnt characters, erasing them. 2148 */ 2149 static void 2150 ttyrubo(tp, cnt) 2151 struct tty *tp; 2152 int cnt; 2153 { 2154 2155 while (cnt-- > 0) { 2156 (void)ttyoutput('\b', tp); 2157 (void)ttyoutput(' ', tp); 2158 (void)ttyoutput('\b', tp); 2159 } 2160 } 2161 2162 /* 2163 * ttyretype -- 2164 * Reprint the rawq line. Note, it is assumed that c_cc has already 2165 * been checked. 2166 */ 2167 static void 2168 ttyretype(tp) 2169 struct tty *tp; 2170 { 2171 char *cp; 2172 int c; 2173 2174 /* Echo the reprint character. */ 2175 if (tp->t_cc[VREPRINT] != _POSIX_VDISABLE) 2176 ttyecho(tp->t_cc[VREPRINT], tp); 2177 2178 (void)ttyoutput('\n', tp); 2179 2180 /* 2181 * XXX 2182 * FIX: NEXTC IS BROKEN - DOESN'T CHECK QUOTE 2183 * BIT OF FIRST CHAR. 2184 */ 2185 crit_enter(); 2186 for (cp = tp->t_canq.c_cf, c = (cp != NULL ? *cp : 0); 2187 cp != NULL; cp = nextc(&tp->t_canq, cp, &c)) 2188 ttyecho(c, tp); 2189 for (cp = tp->t_rawq.c_cf, c = (cp != NULL ? *cp : 0); 2190 cp != NULL; cp = nextc(&tp->t_rawq, cp, &c)) 2191 ttyecho(c, tp); 2192 CLR(tp->t_state, TS_ERASE); 2193 crit_exit(); 2194 2195 tp->t_rocount = tp->t_rawq.c_cc; 2196 tp->t_rocol = 0; 2197 } 2198 2199 /* 2200 * Echo a typed character to the terminal. 2201 */ 2202 static void 2203 ttyecho(c, tp) 2204 int c; 2205 struct tty *tp; 2206 { 2207 2208 if (!ISSET(tp->t_state, TS_CNTTB)) 2209 CLR(tp->t_lflag, FLUSHO); 2210 if ((!ISSET(tp->t_lflag, ECHO) && 2211 (c != '\n' || !ISSET(tp->t_lflag, ECHONL))) || 2212 ISSET(tp->t_lflag, EXTPROC)) 2213 return; 2214 if (ISSET(tp->t_lflag, ECHOCTL) && 2215 ((ISSET(c, TTY_CHARMASK) <= 037 && c != '\t' && c != '\n') || 2216 ISSET(c, TTY_CHARMASK) == 0177)) { 2217 (void)ttyoutput('^', tp); 2218 CLR(c, ~TTY_CHARMASK); 2219 if (c == 0177) 2220 c = '?'; 2221 else 2222 c += 'A' - 1; 2223 } 2224 (void)ttyoutput(c, tp); 2225 } 2226 2227 /* 2228 * Wake up any readers on a tty. 2229 */ 2230 void 2231 ttwakeup(tp) 2232 struct tty *tp; 2233 { 2234 2235 if (tp->t_rsel.si_pid != 0) 2236 selwakeup(&tp->t_rsel); 2237 if (ISSET(tp->t_state, TS_ASYNC) && tp->t_sigio != NULL) 2238 pgsigio(tp->t_sigio, SIGIO, (tp->t_session != NULL)); 2239 wakeup(TSA_HUP_OR_INPUT(tp)); 2240 KNOTE(&tp->t_rsel.si_note, 0); 2241 } 2242 2243 /* 2244 * Wake up any writers on a tty. 2245 */ 2246 void 2247 ttwwakeup(tp) 2248 struct tty *tp; 2249 { 2250 2251 if (tp->t_wsel.si_pid != 0 && tp->t_outq.c_cc <= tp->t_olowat) 2252 selwakeup(&tp->t_wsel); 2253 if (ISSET(tp->t_state, TS_ASYNC) && tp->t_sigio != NULL) 2254 pgsigio(tp->t_sigio, SIGIO, (tp->t_session != NULL)); 2255 if (ISSET(tp->t_state, TS_BUSY | TS_SO_OCOMPLETE) == 2256 TS_SO_OCOMPLETE && tp->t_outq.c_cc == 0) { 2257 CLR(tp->t_state, TS_SO_OCOMPLETE); 2258 wakeup(TSA_OCOMPLETE(tp)); 2259 } 2260 if (ISSET(tp->t_state, TS_SO_OLOWAT) && 2261 tp->t_outq.c_cc <= tp->t_olowat) { 2262 CLR(tp->t_state, TS_SO_OLOWAT); 2263 wakeup(TSA_OLOWAT(tp)); 2264 } 2265 KNOTE(&tp->t_wsel.si_note, 0); 2266 } 2267 2268 /* 2269 * Look up a code for a specified speed in a conversion table; 2270 * used by drivers to map software speed values to hardware parameters. 2271 */ 2272 int 2273 ttspeedtab(speed, table) 2274 int speed; 2275 struct speedtab *table; 2276 { 2277 2278 for ( ; table->sp_speed != -1; table++) 2279 if (table->sp_speed == speed) 2280 return (table->sp_code); 2281 return (-1); 2282 } 2283 2284 /* 2285 * Set input and output watermarks and buffer sizes. For input, the 2286 * high watermark is about one second's worth of input above empty, the 2287 * low watermark is slightly below high water, and the buffer size is a 2288 * driver-dependent amount above high water. For output, the watermarks 2289 * are near the ends of the buffer, with about 1 second's worth of input 2290 * between them. All this only applies to the standard line discipline. 2291 */ 2292 void 2293 ttsetwater(tp) 2294 struct tty *tp; 2295 { 2296 int cps, ttmaxhiwat, x; 2297 2298 /* Input. */ 2299 clist_alloc_cblocks(&tp->t_canq, TTYHOG, 512); 2300 switch (tp->t_ispeedwat) { 2301 case (speed_t)-1: 2302 cps = tp->t_ispeed / 10; 2303 break; 2304 case 0: 2305 /* 2306 * This case is for old drivers that don't know about 2307 * t_ispeedwat. Arrange for them to get the old buffer 2308 * sizes and watermarks. 2309 */ 2310 cps = TTYHOG - 2 * 256; 2311 tp->t_ififosize = 2 * 256; 2312 break; 2313 default: 2314 cps = tp->t_ispeedwat / 10; 2315 break; 2316 } 2317 tp->t_ihiwat = cps; 2318 tp->t_ilowat = 7 * cps / 8; 2319 x = cps + tp->t_ififosize; 2320 clist_alloc_cblocks(&tp->t_rawq, x, x); 2321 2322 /* Output. */ 2323 switch (tp->t_ospeedwat) { 2324 case (speed_t)-1: 2325 cps = tp->t_ospeed / 10; 2326 ttmaxhiwat = 2 * TTMAXHIWAT; 2327 break; 2328 case 0: 2329 cps = tp->t_ospeed / 10; 2330 ttmaxhiwat = TTMAXHIWAT; 2331 break; 2332 default: 2333 cps = tp->t_ospeedwat / 10; 2334 ttmaxhiwat = 8 * TTMAXHIWAT; 2335 break; 2336 } 2337 #define CLAMP(x, h, l) ((x) > h ? h : ((x) < l) ? l : (x)) 2338 tp->t_olowat = x = CLAMP(cps / 2, TTMAXLOWAT, TTMINLOWAT); 2339 x += cps; 2340 x = CLAMP(x, ttmaxhiwat, TTMINHIWAT); /* XXX clamps are too magic */ 2341 tp->t_ohiwat = roundup(x, CBSIZE); /* XXX for compat */ 2342 x = imax(tp->t_ohiwat, TTMAXHIWAT); /* XXX for compat/safety */ 2343 x += OBUFSIZ + 100; 2344 clist_alloc_cblocks(&tp->t_outq, x, x); 2345 #undef CLAMP 2346 } 2347 2348 /* 2349 * Report on state of foreground process group. 2350 */ 2351 void 2352 ttyinfo(tp) 2353 struct tty *tp; 2354 { 2355 struct proc *p, *pick; 2356 struct timeval utime, stime; 2357 int tmp; 2358 2359 if (ttycheckoutq(tp,0) == 0) 2360 return; 2361 2362 /* 2363 * We always print the load average, then figure out what else to 2364 * print based on the state of the current process group. 2365 */ 2366 tmp = (averunnable.ldavg[0] * 100 + FSCALE / 2) >> FSHIFT; 2367 ttyprintf(tp, "load: %d.%02d ", tmp / 100, tmp % 100); 2368 2369 if (tp->t_session == NULL) { 2370 ttyprintf(tp, "not a controlling terminal\n"); 2371 } else if (tp->t_pgrp == NULL) { 2372 ttyprintf(tp, "no foreground process group\n"); 2373 } else if ((p = LIST_FIRST(&tp->t_pgrp->pg_members)) == 0) { 2374 ttyprintf(tp, "empty foreground process group\n"); 2375 } else { 2376 /* 2377 * Pick an interesting process. Note that certain elements, 2378 * in particular the wmesg, require a critical section for 2379 * safe access (YYY and we are still not MP safe). 2380 * 2381 * NOTE: p_wmesg is p_thread->td_wmesg, and p_comm is 2382 * p_thread->td_comm. 2383 */ 2384 char buf[64]; 2385 const char *str; 2386 int isinmem; 2387 long vmsz; 2388 int pctcpu; 2389 2390 crit_enter(); 2391 2392 for (pick = NULL; p != 0; p = LIST_NEXT(p, p_pglist)) { 2393 if (proc_compare(pick, p)) 2394 pick = p; 2395 } 2396 2397 /* 2398 * Figure out what wait/process-state message, and command 2399 * buffer to present 2400 */ 2401 if (pick->p_thread == NULL) 2402 str = "exiting"; 2403 else if (pick->p_stat == SRUN) 2404 str = "running"; 2405 else if (pick->p_wmesg) /* p_thread must not be NULL */ 2406 str = pick->p_wmesg; 2407 else 2408 str = "iowait"; 2409 2410 snprintf(buf, sizeof(buf), "cmd: %s %d [%s]", 2411 (pick->p_thread ? pick->p_comm : "?"), 2412 pick->p_pid, str); 2413 2414 /* 2415 * Calculate cpu usage, percent cpu, and cmsz. Note that 2416 * 'pick' becomes invalid the moment we exit the critical 2417 * section. 2418 */ 2419 if (pick->p_thread && (pick->p_flag & P_SWAPPEDOUT) == 0) { 2420 calcru(pick, &utime, &stime, NULL); 2421 isinmem = 1; 2422 } else { 2423 isinmem = 0; 2424 } 2425 2426 pctcpu = (pick->p_pctcpu * 10000 + FSCALE / 2) >> FSHIFT; 2427 2428 if (pick->p_stat == SIDL || (pick->p_flag & P_ZOMBIE)) 2429 vmsz = 0; 2430 else 2431 vmsz = pgtok(vmspace_resident_count(pick->p_vmspace)); 2432 2433 crit_exit(); 2434 2435 /* 2436 * Dump the output 2437 */ 2438 ttyprintf(tp, " %s ", buf); 2439 if (isinmem) { 2440 ttyprintf(tp, "%ld.%02ldu ", 2441 utime.tv_sec, utime.tv_usec / 10000); 2442 ttyprintf(tp, "%ld.%02lds ", 2443 stime.tv_sec, stime.tv_usec / 10000); 2444 } else { 2445 ttyprintf(tp, "?.??u ?.??s "); 2446 } 2447 ttyprintf(tp, "%d%% %ldk\n", pctcpu / 100, vmsz); 2448 } 2449 tp->t_rocount = 0; /* so pending input will be retyped if BS */ 2450 } 2451 2452 /* 2453 * Returns 1 if p2 is "better" than p1 2454 * 2455 * The algorithm for picking the "interesting" process is thus: 2456 * 2457 * 1) Only foreground processes are eligible - implied. 2458 * 2) Runnable processes are favored over anything else. The runner 2459 * with the highest cpu utilization is picked (p_cpticks). Ties are 2460 * broken by picking the highest pid. 2461 * 3) The sleeper with the shortest sleep time is next. With ties, 2462 * we pick out just "short-term" sleepers (P_SINTR == 0). 2463 * 4) Further ties are broken by picking the highest pid. 2464 */ 2465 #define ISRUN(p) (((p)->p_stat == SRUN) || ((p)->p_stat == SIDL)) 2466 #define TESTAB(a, b) ((a)<<1 | (b)) 2467 #define ONLYA 2 2468 #define ONLYB 1 2469 #define BOTH 3 2470 2471 static int 2472 proc_compare(p1, p2) 2473 struct proc *p1, *p2; 2474 { 2475 2476 if (p1 == NULL) 2477 return (1); 2478 /* 2479 * see if at least one of them is runnable 2480 */ 2481 switch (TESTAB(ISRUN(p1), ISRUN(p2))) { 2482 case ONLYA: 2483 return (0); 2484 case ONLYB: 2485 return (1); 2486 case BOTH: 2487 /* 2488 * tie - favor one with highest recent cpu utilization 2489 */ 2490 if (p2->p_cpticks > p1->p_cpticks) 2491 return (1); 2492 if (p1->p_cpticks > p2->p_cpticks) 2493 return (0); 2494 return (p2->p_pid > p1->p_pid); /* tie - return highest pid */ 2495 } 2496 /* 2497 * weed out zombies 2498 */ 2499 switch (TESTAB((p1->p_flag & P_ZOMBIE), (p2->p_flag & P_ZOMBIE))) { 2500 case ONLYA: 2501 return (1); 2502 case ONLYB: 2503 return (0); 2504 case BOTH: 2505 return (p2->p_pid > p1->p_pid); /* tie - return highest pid */ 2506 } 2507 /* 2508 * pick the one with the smallest sleep time 2509 */ 2510 if (p2->p_slptime > p1->p_slptime) 2511 return (0); 2512 if (p1->p_slptime > p2->p_slptime) 2513 return (1); 2514 /* 2515 * favor one sleeping in a non-interruptible sleep 2516 */ 2517 if (p1->p_flag & P_SINTR && (p2->p_flag & P_SINTR) == 0) 2518 return (1); 2519 if (p2->p_flag & P_SINTR && (p1->p_flag & P_SINTR) == 0) 2520 return (0); 2521 return (p2->p_pid > p1->p_pid); /* tie - return highest pid */ 2522 } 2523 2524 /* 2525 * Output char to tty; console putchar style. 2526 */ 2527 int 2528 tputchar(c, tp) 2529 int c; 2530 struct tty *tp; 2531 { 2532 crit_enter(); 2533 if (!ISSET(tp->t_state, TS_CONNECTED)) { 2534 crit_exit(); 2535 return (-1); 2536 } 2537 if (c == '\n') 2538 (void)ttyoutput('\r', tp); 2539 (void)ttyoutput(c, tp); 2540 ttstart(tp); 2541 crit_exit(); 2542 return (0); 2543 } 2544 2545 /* 2546 * Sleep on chan, returning ERESTART if tty changed while we napped and 2547 * returning any errors (e.g. EINTR/EWOULDBLOCK) reported by tsleep. If 2548 * the tty is revoked, restarting a pending call will redo validation done 2549 * at the start of the call. 2550 */ 2551 int 2552 ttysleep(tp, chan, slpflags, wmesg, timo) 2553 struct tty *tp; 2554 void *chan; 2555 int slpflags, timo; 2556 char *wmesg; 2557 { 2558 int error; 2559 int gen; 2560 2561 gen = tp->t_gen; 2562 error = tsleep(chan, slpflags, wmesg, timo); 2563 if (error) 2564 return (error); 2565 return (tp->t_gen == gen ? 0 : ERESTART); 2566 } 2567 2568 /* 2569 * Allocate a tty struct. Clists in the struct will be allocated by 2570 * ttyopen(). 2571 */ 2572 struct tty * 2573 ttymalloc(tp) 2574 struct tty *tp; 2575 { 2576 2577 if (tp) 2578 return(tp); 2579 tp = malloc(sizeof *tp, M_TTYS, M_WAITOK|M_ZERO); 2580 ttyregister(tp); 2581 return (tp); 2582 } 2583 2584 #if 0 2585 /* 2586 * Free a tty struct. Clists in the struct should have been freed by 2587 * ttyclose(). 2588 * 2589 * XXX not yet usable: since we support a half-closed state and do not 2590 * ref count the tty reference from the session, it is possible for a 2591 * session to hold a ref on the tty. See TTY_DO_FULL_CLOSE. 2592 */ 2593 void 2594 ttyfree(tp) 2595 struct tty *tp; 2596 { 2597 free(tp, M_TTYS); 2598 } 2599 #endif /* 0 */ 2600 2601 void 2602 ttyregister(tp) 2603 struct tty *tp; 2604 { 2605 SLIST_INSERT_HEAD(&tty_list, tp, t_list); 2606 } 2607 2608 static int 2609 sysctl_kern_ttys(SYSCTL_HANDLER_ARGS) 2610 { 2611 int error; 2612 struct tty *tp, t; 2613 SLIST_FOREACH(tp, &tty_list, t_list) { 2614 t = *tp; 2615 if (t.t_dev) 2616 t.t_dev = (dev_t)dev2udev(t.t_dev); 2617 error = SYSCTL_OUT(req, (caddr_t)&t, sizeof(t)); 2618 if (error) 2619 return (error); 2620 } 2621 return (0); 2622 } 2623 2624 SYSCTL_PROC(_kern, OID_AUTO, ttys, CTLTYPE_OPAQUE|CTLFLAG_RD, 2625 0, 0, sysctl_kern_ttys, "S,tty", "All struct ttys"); 2626 2627 void 2628 nottystop(tp, rw) 2629 struct tty *tp; 2630 int rw; 2631 { 2632 2633 return; 2634 } 2635 2636 int 2637 ttyread(struct dev_read_args *ap) 2638 { 2639 struct tty *tp; 2640 2641 tp = ap->a_head.a_dev->si_tty; 2642 if (tp == NULL) 2643 return (ENODEV); 2644 return ((*linesw[tp->t_line].l_read)(tp, ap->a_uio, ap->a_ioflag)); 2645 } 2646 2647 int 2648 ttywrite(struct dev_write_args *ap) 2649 { 2650 struct tty *tp; 2651 2652 tp = ap->a_head.a_dev->si_tty; 2653 if (tp == NULL) 2654 return (ENODEV); 2655 return ((*linesw[tp->t_line].l_write)(tp, ap->a_uio, ap->a_ioflag)); 2656 } 2657