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 1.46 2008/09/10 09:50:09 y0netan1 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 #include <sys/priv.h> 82 #define TTYDEFCHARS 83 #include <sys/tty.h> 84 #include <sys/clist.h> 85 #undef TTYDEFCHARS 86 #include <sys/fcntl.h> 87 #include <sys/conf.h> 88 #include <sys/dkstat.h> 89 #include <sys/kernel.h> 90 #include <sys/vnode.h> 91 #include <sys/signalvar.h> 92 #include <sys/signal2.h> 93 #include <sys/resourcevar.h> 94 #include <sys/malloc.h> 95 #include <sys/filedesc.h> 96 #include <sys/sysctl.h> 97 #include <sys/thread2.h> 98 99 #include <vm/vm.h> 100 #include <sys/lock.h> 101 #include <vm/pmap.h> 102 #include <vm/vm_map.h> 103 104 MALLOC_DEFINE(M_TTYS, "ttys", "tty data structures"); 105 106 static int proc_compare (struct proc *p1, struct proc *p2); 107 static int ttnread (struct tty *tp); 108 static void ttyecho (int c, struct tty *tp); 109 static int ttyoutput (int c, struct tty *tp); 110 static void ttypend (struct tty *tp); 111 static void ttyretype (struct tty *tp); 112 static void ttyrub (int c, struct tty *tp); 113 static void ttyrubo (struct tty *tp, int cnt); 114 static void ttyunblock (struct tty *tp); 115 static int ttywflush (struct tty *tp); 116 static int filt_ttyread (struct knote *kn, long hint); 117 static void filt_ttyrdetach (struct knote *kn); 118 static int filt_ttywrite (struct knote *kn, long hint); 119 static void filt_ttywdetach (struct knote *kn); 120 121 /* 122 * Table with character classes and parity. The 8th bit indicates parity, 123 * the 7th bit indicates the character is an alphameric or underscore (for 124 * ALTWERASE), and the low 6 bits indicate delay type. If the low 6 bits 125 * are 0 then the character needs no special processing on output; classes 126 * other than 0 might be translated or (not currently) require delays. 127 */ 128 #define E 0x00 /* Even parity. */ 129 #define O 0x80 /* Odd parity. */ 130 #define PARITY(c) (char_type[c] & O) 131 132 #define ALPHA 0x40 /* Alpha or underscore. */ 133 #define ISALPHA(c) (char_type[(c) & TTY_CHARMASK] & ALPHA) 134 135 #define CCLASSMASK 0x3f 136 #define CCLASS(c) (char_type[c] & CCLASSMASK) 137 138 #define BS BACKSPACE 139 #define CC CONTROL 140 #define CR RETURN 141 #define NA ORDINARY | ALPHA 142 #define NL NEWLINE 143 #define NO ORDINARY 144 #define TB TAB 145 #define VT VTAB 146 147 static u_char const char_type[] = { 148 E|CC, O|CC, O|CC, E|CC, O|CC, E|CC, E|CC, O|CC, /* nul - bel */ 149 O|BS, E|TB, E|NL, O|CC, E|VT, O|CR, O|CC, E|CC, /* bs - si */ 150 O|CC, E|CC, E|CC, O|CC, E|CC, O|CC, O|CC, E|CC, /* dle - etb */ 151 E|CC, O|CC, O|CC, E|CC, O|CC, E|CC, E|CC, O|CC, /* can - us */ 152 O|NO, E|NO, E|NO, O|NO, E|NO, O|NO, O|NO, E|NO, /* sp - ' */ 153 E|NO, O|NO, O|NO, E|NO, O|NO, E|NO, E|NO, O|NO, /* ( - / */ 154 E|NA, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* 0 - 7 */ 155 O|NA, E|NA, E|NO, O|NO, E|NO, O|NO, O|NO, E|NO, /* 8 - ? */ 156 O|NO, E|NA, E|NA, O|NA, E|NA, O|NA, O|NA, E|NA, /* @ - G */ 157 E|NA, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* H - O */ 158 E|NA, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* P - W */ 159 O|NA, E|NA, E|NA, O|NO, E|NO, O|NO, O|NO, O|NA, /* X - _ */ 160 E|NO, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* ` - g */ 161 O|NA, E|NA, E|NA, O|NA, E|NA, O|NA, O|NA, E|NA, /* h - o */ 162 O|NA, E|NA, E|NA, O|NA, E|NA, O|NA, O|NA, E|NA, /* p - w */ 163 E|NA, O|NA, O|NA, E|NO, O|NO, E|NO, E|NO, O|CC, /* x - del */ 164 /* 165 * Meta chars; should be settable per character set; 166 * for now, treat them all as normal characters. 167 */ 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 NA, NA, NA, NA, NA, NA, NA, NA, 184 }; 185 #undef BS 186 #undef CC 187 #undef CR 188 #undef NA 189 #undef NL 190 #undef NO 191 #undef TB 192 #undef VT 193 194 /* Macros to clear/set/test flags. */ 195 #define SET(t, f) (t) |= (f) 196 #define CLR(t, f) (t) &= ~(f) 197 #define ISSET(t, f) ((t) & (f)) 198 199 #undef MAX_INPUT /* XXX wrong in <sys/syslimits.h> */ 200 #define MAX_INPUT TTYHOG /* XXX limit is usually larger for !ICANON */ 201 202 uint64_t tk_nin; 203 SYSCTL_OPAQUE(_kern, OID_AUTO, tk_nin, CTLFLAG_RD, &tk_nin, sizeof(tk_nin), 204 "LU", "TTY input statistic"); 205 uint64_t tk_nout; 206 SYSCTL_OPAQUE(_kern, OID_AUTO, tk_nout, CTLFLAG_RD, &tk_nout, sizeof(tk_nout), 207 "LU", "TTY output statistic"); 208 uint64_t tk_rawcc; 209 210 /* 211 * list of struct tty where pstat(8) can pick it up with sysctl 212 */ 213 static TAILQ_HEAD(, tty) tty_list = TAILQ_HEAD_INITIALIZER(tty_list); 214 215 /* 216 * Initial open of tty, or (re)entry to standard tty line discipline. 217 */ 218 int 219 ttyopen(cdev_t device, struct tty *tp) 220 { 221 crit_enter(); 222 tp->t_dev = device; 223 if (!ISSET(tp->t_state, TS_ISOPEN)) { 224 SET(tp->t_state, TS_ISOPEN); 225 if (ISSET(tp->t_cflag, CLOCAL)) { 226 SET(tp->t_state, TS_CONNECTED); 227 } 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(struct tty *tp) 246 { 247 funsetown(tp->t_sigio); 248 crit_enter(); 249 if (constty == tp) 250 constty = NULL; 251 252 ttyflush(tp, FREAD | FWRITE); 253 clist_free_cblocks(&tp->t_canq); 254 clist_free_cblocks(&tp->t_outq); 255 clist_free_cblocks(&tp->t_rawq); 256 257 tp->t_gen++; 258 tp->t_line = TTYDISC; 259 ttyclearsession(tp); 260 tp->t_state &= TS_REGISTERED; /* clear all bits except */ 261 crit_exit(); 262 return (0); 263 } 264 265 /* 266 * Disassociate the tty from its session. Traditionally this has only been 267 * a half-close, meaning that the session was still allowed to point at the 268 * tty (resulting in the tty in the ps command showing something like 'p0-'), 269 * even though the tty is no longer pointing at the session. 270 * 271 * The half close seems to be useful only for 'ps' output but there is as 272 * yet no reason to remove the feature. The full-close code is currently 273 * #if 0'd out. See also sess_rele() in kern/kern_proc.c. 274 */ 275 void 276 ttyclearsession(struct tty *tp) 277 { 278 struct session *sp; 279 280 tp->t_pgrp = NULL; 281 if ((sp = tp->t_session) != NULL) { 282 tp->t_session = NULL; 283 #ifdef TTY_DO_FULL_CLOSE 284 /* FULL CLOSE (not yet) */ 285 if (sp->s_ttyp == tp) { 286 sp->s_ttyp = NULL; 287 } else { 288 kprintf("ttyclearsession: warning: sp->s_ttyp != tp " 289 "%p/%p\n", sp->s_ttyp, tp); 290 } 291 #endif 292 } 293 } 294 295 /* 296 * Release the tty vnode association for a session. This is the 297 * 'other half' of the close. Because multiple opens of /dev/tty 298 * only generate a single open to the actual tty, the file modes 299 * are locked to FREAD|FWRITE. 300 * 301 * If dorevoke is non-zero, the session is also revoked. We have to 302 * close the vnode if VCTTYISOPEN is set. 303 */ 304 void 305 ttyclosesession(struct session *sp, int dorevoke) 306 { 307 struct vnode *vp; 308 309 retry: 310 /* 311 * There may not be a controlling terminal or it may have been closed 312 * out from under us. 313 */ 314 if ((vp = sp->s_ttyvp) == NULL) 315 return; 316 317 /* 318 * We need a lock if we have to close or revoke. 319 */ 320 if ((vp->v_flag & VCTTYISOPEN) || dorevoke) { 321 vhold(vp); 322 if (vn_lock(vp, LK_EXCLUSIVE|LK_RETRY)) { 323 vdrop(vp); 324 goto retry; 325 } 326 327 /* 328 * Retry if the vnode was ripped out from under us 329 */ 330 if (vp != sp->s_ttyvp) { 331 vn_unlock(vp); 332 vdrop(vp); 333 goto retry; 334 } 335 336 /* 337 * Close and revoke as needed 338 */ 339 sp->s_ttyvp = NULL; 340 if (vp->v_flag & VCTTYISOPEN) { 341 vclrflags(vp, VCTTYISOPEN); 342 VOP_CLOSE(vp, FREAD|FWRITE); 343 } 344 vn_unlock(vp); 345 if (dorevoke) 346 vrevoke(vp, proc0.p_ucred); 347 vdrop(vp); 348 } else { 349 sp->s_ttyvp = NULL; 350 } 351 vrele(vp); 352 } 353 354 #define FLUSHQ(q) { \ 355 if ((q)->c_cc) \ 356 ndflush(q, (q)->c_cc); \ 357 } 358 359 /* Is 'c' a line delimiter ("break" character)? */ 360 #define TTBREAKC(c, lflag) \ 361 ((c) == '\n' || (((c) == cc[VEOF] || \ 362 (c) == cc[VEOL] || ((c) == cc[VEOL2] && lflag & IEXTEN)) && \ 363 (c) != _POSIX_VDISABLE)) 364 365 /* 366 * Process input of a single character received on a tty. 367 */ 368 int 369 ttyinput(int c, struct tty *tp) 370 { 371 tcflag_t iflag, lflag; 372 cc_t *cc; 373 int i, err; 374 375 /* 376 * If input is pending take it first. 377 */ 378 lflag = tp->t_lflag; 379 if (ISSET(lflag, PENDIN)) 380 ttypend(tp); 381 /* 382 * Gather stats. 383 */ 384 if (ISSET(lflag, ICANON)) 385 ++tp->t_cancc; 386 else 387 ++tp->t_rawcc; 388 ++tk_nin; 389 390 /* 391 * Block further input iff: 392 * current input > threshold AND input is available to user program 393 * AND input flow control is enabled and not yet invoked. 394 * The 3 is slop for PARMRK. 395 */ 396 iflag = tp->t_iflag; 397 if (tp->t_rawq.c_cc + tp->t_canq.c_cc > tp->t_ihiwat - 3 && 398 (!ISSET(lflag, ICANON) || tp->t_canq.c_cc != 0) && 399 (ISSET(tp->t_cflag, CRTS_IFLOW) || ISSET(iflag, IXOFF)) && 400 !ISSET(tp->t_state, TS_TBLOCK)) 401 ttyblock(tp); 402 403 /* Handle exceptional conditions (break, parity, framing). */ 404 cc = tp->t_cc; 405 err = (ISSET(c, TTY_ERRORMASK)); 406 if (err) { 407 CLR(c, TTY_ERRORMASK); 408 if (ISSET(err, TTY_BI)) { 409 if (ISSET(iflag, IGNBRK)) 410 return (0); 411 if (ISSET(iflag, BRKINT)) { 412 ttyflush(tp, FREAD | FWRITE); 413 pgsignal(tp->t_pgrp, SIGINT, 1); 414 goto endcase; 415 } 416 if (ISSET(iflag, PARMRK)) 417 goto parmrk; 418 } else if ((ISSET(err, TTY_PE) && ISSET(iflag, INPCK)) 419 || ISSET(err, TTY_FE)) { 420 if (ISSET(iflag, IGNPAR)) 421 return (0); 422 else if (ISSET(iflag, PARMRK)) { 423 parmrk: 424 if (tp->t_rawq.c_cc + tp->t_canq.c_cc > 425 MAX_INPUT - 3) 426 goto input_overflow; 427 clist_putc(0377 | TTY_QUOTE, &tp->t_rawq); 428 clist_putc(0 | TTY_QUOTE, &tp->t_rawq); 429 clist_putc(c | TTY_QUOTE, &tp->t_rawq); 430 goto endcase; 431 } else 432 c = 0; 433 } 434 } 435 436 if (!ISSET(tp->t_state, TS_TYPEN) && ISSET(iflag, ISTRIP)) 437 CLR(c, 0x80); 438 if (!ISSET(lflag, EXTPROC)) { 439 /* 440 * Check for literal nexting very first 441 */ 442 if (ISSET(tp->t_state, TS_LNCH)) { 443 SET(c, TTY_QUOTE); 444 CLR(tp->t_state, TS_LNCH); 445 } 446 /* 447 * Scan for special characters. This code 448 * is really just a big case statement with 449 * non-constant cases. The bottom of the 450 * case statement is labeled ``endcase'', so goto 451 * it after a case match, or similar. 452 */ 453 454 /* 455 * Control chars which aren't controlled 456 * by ICANON, ISIG, or IXON. 457 */ 458 if (ISSET(lflag, IEXTEN)) { 459 if (CCEQ(cc[VLNEXT], c)) { 460 if (ISSET(lflag, ECHO)) { 461 if (ISSET(lflag, ECHOE)) { 462 (void)ttyoutput('^', tp); 463 (void)ttyoutput('\b', tp); 464 } else 465 ttyecho(c, tp); 466 } 467 SET(tp->t_state, TS_LNCH); 468 goto endcase; 469 } 470 if (CCEQ(cc[VDISCARD], c)) { 471 if (ISSET(lflag, FLUSHO)) 472 CLR(tp->t_lflag, FLUSHO); 473 else { 474 ttyflush(tp, FWRITE); 475 ttyecho(c, tp); 476 if (tp->t_rawq.c_cc + tp->t_canq.c_cc) 477 ttyretype(tp); 478 SET(tp->t_lflag, FLUSHO); 479 } 480 goto startoutput; 481 } 482 } 483 /* 484 * Signals. 485 */ 486 if (ISSET(lflag, ISIG)) { 487 if (CCEQ(cc[VINTR], c) || CCEQ(cc[VQUIT], c)) { 488 if (!ISSET(lflag, NOFLSH)) 489 ttyflush(tp, FREAD | FWRITE); 490 ttyecho(c, tp); 491 pgsignal(tp->t_pgrp, 492 CCEQ(cc[VINTR], c) ? SIGINT : SIGQUIT, 1); 493 goto endcase; 494 } 495 if (CCEQ(cc[VSUSP], c)) { 496 if (!ISSET(lflag, NOFLSH)) 497 ttyflush(tp, FREAD); 498 ttyecho(c, tp); 499 pgsignal(tp->t_pgrp, SIGTSTP, 1); 500 goto endcase; 501 } 502 } 503 /* 504 * Handle start/stop characters. 505 */ 506 if (ISSET(iflag, IXON)) { 507 if (CCEQ(cc[VSTOP], c)) { 508 if (!ISSET(tp->t_state, TS_TTSTOP)) { 509 SET(tp->t_state, TS_TTSTOP); 510 (*tp->t_stop)(tp, 0); 511 return (0); 512 } 513 if (!CCEQ(cc[VSTART], c)) 514 return (0); 515 /* 516 * if VSTART == VSTOP then toggle 517 */ 518 goto endcase; 519 } 520 if (CCEQ(cc[VSTART], c)) 521 goto restartoutput; 522 } 523 /* 524 * IGNCR, ICRNL, & INLCR 525 */ 526 if (c == '\r') { 527 if (ISSET(iflag, IGNCR)) 528 return (0); 529 else if (ISSET(iflag, ICRNL)) 530 c = '\n'; 531 } else if (c == '\n' && ISSET(iflag, INLCR)) 532 c = '\r'; 533 } 534 if (!ISSET(tp->t_lflag, EXTPROC) && ISSET(lflag, ICANON)) { 535 /* 536 * From here on down canonical mode character 537 * processing takes place. 538 */ 539 /* 540 * erase or erase2 (^H / ^?) 541 */ 542 if (CCEQ(cc[VERASE], c) || CCEQ(cc[VERASE2], c) ) { 543 if (tp->t_rawq.c_cc) 544 ttyrub(clist_unputc(&tp->t_rawq), tp); 545 goto endcase; 546 } 547 /* 548 * kill (^U) 549 */ 550 if (CCEQ(cc[VKILL], c)) { 551 if (ISSET(lflag, ECHOKE) && 552 tp->t_rawq.c_cc == tp->t_rocount && 553 !ISSET(lflag, ECHOPRT)) 554 while (tp->t_rawq.c_cc) 555 ttyrub(clist_unputc(&tp->t_rawq), tp); 556 else { 557 ttyecho(c, tp); 558 if (ISSET(lflag, ECHOK) || 559 ISSET(lflag, ECHOKE)) 560 ttyecho('\n', tp); 561 FLUSHQ(&tp->t_rawq); 562 tp->t_rocount = 0; 563 } 564 CLR(tp->t_state, TS_LOCAL); 565 goto endcase; 566 } 567 /* 568 * word erase (^W) 569 */ 570 if (CCEQ(cc[VWERASE], c) && ISSET(lflag, IEXTEN)) { 571 int ctype; 572 573 /* 574 * erase whitespace 575 */ 576 while ((c = clist_unputc(&tp->t_rawq)) == ' ' || c == '\t') 577 ttyrub(c, tp); 578 if (c == -1) 579 goto endcase; 580 /* 581 * erase last char of word and remember the 582 * next chars type (for ALTWERASE) 583 */ 584 ttyrub(c, tp); 585 c = clist_unputc(&tp->t_rawq); 586 if (c == -1) 587 goto endcase; 588 if (c == ' ' || c == '\t') { 589 clist_putc(c, &tp->t_rawq); 590 goto endcase; 591 } 592 ctype = ISALPHA(c); 593 /* 594 * erase rest of word 595 */ 596 do { 597 ttyrub(c, tp); 598 c = clist_unputc(&tp->t_rawq); 599 if (c == -1) 600 goto endcase; 601 } while (c != ' ' && c != '\t' && 602 (!ISSET(lflag, ALTWERASE) || ISALPHA(c) == ctype)); 603 clist_putc(c, &tp->t_rawq); 604 goto endcase; 605 } 606 /* 607 * reprint line (^R) 608 */ 609 if (CCEQ(cc[VREPRINT], c) && ISSET(lflag, IEXTEN)) { 610 ttyretype(tp); 611 goto endcase; 612 } 613 /* 614 * ^T - kernel info and generate SIGINFO 615 */ 616 if (CCEQ(cc[VSTATUS], c) && ISSET(lflag, IEXTEN)) { 617 if (ISSET(lflag, ISIG)) 618 pgsignal(tp->t_pgrp, SIGINFO, 1); 619 if (!ISSET(lflag, NOKERNINFO)) 620 ttyinfo(tp); 621 goto endcase; 622 } 623 if (CCEQ(cc[VCHECKPT], c) && ISSET(lflag, IEXTEN)) { 624 if (ISSET(lflag, ISIG)) 625 pgsignal(tp->t_pgrp, SIGCKPT, 1); 626 goto endcase; 627 } 628 } 629 /* 630 * Check for input buffer overflow 631 */ 632 if (tp->t_rawq.c_cc + tp->t_canq.c_cc >= MAX_INPUT) { 633 input_overflow: 634 if (ISSET(iflag, IMAXBEL)) { 635 if (tp->t_outq.c_cc < tp->t_ohiwat) 636 (void)ttyoutput(CTRL('g'), tp); 637 } 638 goto endcase; 639 } 640 641 if ( c == 0377 && ISSET(iflag, PARMRK) && !ISSET(iflag, ISTRIP) 642 && ISSET(iflag, IGNBRK|IGNPAR) != (IGNBRK|IGNPAR)) 643 clist_putc(0377 | TTY_QUOTE, &tp->t_rawq); 644 645 /* 646 * Put data char in q for user and 647 * wakeup on seeing a line delimiter. 648 */ 649 if (clist_putc(c, &tp->t_rawq) >= 0) { 650 if (!ISSET(lflag, ICANON)) { 651 ttwakeup(tp); 652 ttyecho(c, tp); 653 goto endcase; 654 } 655 if (TTBREAKC(c, lflag)) { 656 tp->t_rocount = 0; 657 catq(&tp->t_rawq, &tp->t_canq); 658 ttwakeup(tp); 659 } else if (tp->t_rocount++ == 0) 660 tp->t_rocol = tp->t_column; 661 if (ISSET(tp->t_state, TS_ERASE)) { 662 /* 663 * end of prterase \.../ 664 */ 665 CLR(tp->t_state, TS_ERASE); 666 (void)ttyoutput('/', tp); 667 } 668 i = tp->t_column; 669 ttyecho(c, tp); 670 if (CCEQ(cc[VEOF], c) && ISSET(lflag, ECHO)) { 671 /* 672 * Place the cursor over the '^' of the ^D. 673 */ 674 i = imin(2, tp->t_column - i); 675 while (i > 0) { 676 (void)ttyoutput('\b', tp); 677 i--; 678 } 679 } 680 } 681 endcase: 682 /* 683 * IXANY means allow any character to restart output. 684 */ 685 if (ISSET(tp->t_state, TS_TTSTOP) && 686 !ISSET(iflag, IXANY) && cc[VSTART] != cc[VSTOP]) 687 return (0); 688 restartoutput: 689 CLR(tp->t_lflag, FLUSHO); 690 CLR(tp->t_state, TS_TTSTOP); 691 startoutput: 692 return (ttstart(tp)); 693 } 694 695 /* 696 * Output a single character on a tty, doing output processing 697 * as needed (expanding tabs, newline processing, etc.). 698 * Returns < 0 if succeeds, otherwise returns char to resend. 699 * Must be recursive. 700 */ 701 static int 702 ttyoutput(int c, struct tty *tp) 703 { 704 tcflag_t oflag; 705 int col; 706 707 oflag = tp->t_oflag; 708 if (!ISSET(oflag, OPOST)) { 709 if (ISSET(tp->t_lflag, FLUSHO)) 710 return (-1); 711 if (clist_putc(c, &tp->t_outq)) 712 return (c); 713 tk_nout++; 714 tp->t_outcc++; 715 return (-1); 716 } 717 /* 718 * Do tab expansion if OXTABS is set. Special case if we external 719 * processing, we don't do the tab expansion because we'll probably 720 * get it wrong. If tab expansion needs to be done, let it happen 721 * externally. 722 */ 723 CLR(c, ~TTY_CHARMASK); 724 if (c == '\t' && 725 ISSET(oflag, OXTABS) && !ISSET(tp->t_lflag, EXTPROC)) { 726 c = 8 - (tp->t_column & 7); 727 if (!ISSET(tp->t_lflag, FLUSHO)) { 728 crit_enter(); /* Don't interrupt tabs. */ 729 c -= b_to_q(" ", c, &tp->t_outq); 730 tk_nout += c; 731 tp->t_outcc += c; 732 crit_exit(); 733 } 734 tp->t_column += c; 735 return (c ? -1 : '\t'); 736 } 737 if (c == CEOT && ISSET(oflag, ONOEOT)) 738 return (-1); 739 740 /* 741 * Newline translation: if ONLCR is set, 742 * translate newline into "\r\n". 743 */ 744 if (c == '\n' && ISSET(tp->t_oflag, ONLCR)) { 745 tk_nout++; 746 tp->t_outcc++; 747 if (!ISSET(tp->t_lflag, FLUSHO) && clist_putc('\r', &tp->t_outq)) 748 return (c); 749 } 750 /* If OCRNL is set, translate "\r" into "\n". */ 751 else if (c == '\r' && ISSET(tp->t_oflag, OCRNL)) 752 c = '\n'; 753 /* If ONOCR is set, don't transmit CRs when on column 0. */ 754 else if (c == '\r' && ISSET(tp->t_oflag, ONOCR) && tp->t_column == 0) 755 return (-1); 756 757 tk_nout++; 758 tp->t_outcc++; 759 if (!ISSET(tp->t_lflag, FLUSHO) && clist_putc(c, &tp->t_outq)) 760 return (c); 761 762 col = tp->t_column; 763 switch (CCLASS(c)) { 764 case BACKSPACE: 765 if (col > 0) 766 --col; 767 break; 768 case CONTROL: 769 break; 770 case NEWLINE: 771 if (ISSET(tp->t_oflag, ONLCR | ONLRET)) 772 col = 0; 773 break; 774 case RETURN: 775 col = 0; 776 break; 777 case ORDINARY: 778 ++col; 779 break; 780 case TAB: 781 col = (col + 8) & ~7; 782 break; 783 } 784 tp->t_column = col; 785 return (-1); 786 } 787 788 /* 789 * Ioctls for all tty devices. Called after line-discipline specific ioctl 790 * has been called to do discipline-specific functions and/or reject any 791 * of these ioctl commands. 792 */ 793 /* ARGSUSED */ 794 int 795 ttioctl(struct tty *tp, u_long cmd, void *data, int flag) 796 { 797 struct thread *td = curthread; 798 struct lwp *lp = td->td_lwp; 799 struct proc *p = td->td_proc; 800 int error; 801 802 KKASSERT(p); 803 804 /* If the ioctl involves modification, hang if in the background. */ 805 switch (cmd) { 806 case TIOCCBRK: 807 case TIOCCONS: 808 case TIOCDRAIN: 809 case TIOCEXCL: 810 case TIOCFLUSH: 811 #ifdef TIOCHPCL 812 case TIOCHPCL: 813 #endif 814 case TIOCNXCL: 815 case TIOCSBRK: 816 case TIOCSCTTY: 817 case TIOCSDRAINWAIT: 818 case TIOCSETA: 819 case TIOCSETAF: 820 case TIOCSETAW: 821 case TIOCSETD: 822 case TIOCSPGRP: 823 case TIOCSTART: 824 case TIOCSTAT: 825 case TIOCSTI: 826 case TIOCSTOP: 827 case TIOCSWINSZ: 828 #if defined(COMPAT_43) || defined(COMPAT_SUNOS) 829 case TIOCLBIC: 830 case TIOCLBIS: 831 case TIOCLSET: 832 case TIOCSETC: 833 case OTIOCSETD: 834 case TIOCSETN: 835 case TIOCSETP: 836 case TIOCSLTC: 837 #endif 838 while (isbackground(p, tp) && !(p->p_flag & P_PPWAIT) && 839 !SIGISMEMBER(p->p_sigignore, SIGTTOU) && 840 !SIGISMEMBER(lp->lwp_sigmask, SIGTTOU)) { 841 if (p->p_pgrp->pg_jobc == 0) 842 return (EIO); 843 pgsignal(p->p_pgrp, SIGTTOU, 1); 844 error = ttysleep(tp, &lbolt, PCATCH, "ttybg1", 845 0); 846 if (error) 847 return (error); 848 } 849 break; 850 } 851 852 switch (cmd) { /* Process the ioctl. */ 853 case FIOASYNC: /* set/clear async i/o */ 854 crit_enter(); 855 if (*(int *)data) 856 SET(tp->t_state, TS_ASYNC); 857 else 858 CLR(tp->t_state, TS_ASYNC); 859 crit_exit(); 860 break; 861 case FIONREAD: /* get # bytes to read */ 862 crit_enter(); 863 *(int *)data = ttnread(tp); 864 crit_exit(); 865 break; 866 867 case FIOSETOWN: 868 /* 869 * Policy -- Don't allow FIOSETOWN on someone else's 870 * controlling tty 871 */ 872 if (tp->t_session != NULL && !isctty(p, tp)) 873 return (ENOTTY); 874 875 error = fsetown(*(int *)data, &tp->t_sigio); 876 if (error) 877 return (error); 878 break; 879 case FIOGETOWN: 880 if (tp->t_session != NULL && !isctty(p, tp)) 881 return (ENOTTY); 882 *(int *)data = fgetown(tp->t_sigio); 883 break; 884 885 case TIOCEXCL: /* set exclusive use of tty */ 886 crit_enter(); 887 SET(tp->t_state, TS_XCLUDE); 888 crit_exit(); 889 break; 890 case TIOCFLUSH: { /* flush buffers */ 891 int flags = *(int *)data; 892 893 if (flags == 0) 894 flags = FREAD | FWRITE; 895 else 896 flags &= FREAD | FWRITE; 897 ttyflush(tp, flags); 898 break; 899 } 900 case TIOCCONS: /* become virtual console */ 901 if (*(int *)data) { 902 if (constty && constty != tp && 903 ISSET(constty->t_state, TS_CONNECTED)) 904 return (EBUSY); 905 #ifndef UCONSOLE 906 if ((error = priv_check(td, PRIV_ROOT)) != 0) 907 return (error); 908 #endif 909 constty = tp; 910 } else if (tp == constty) 911 constty = NULL; 912 break; 913 case TIOCDRAIN: /* wait till output drained */ 914 error = ttywait(tp); 915 if (error) 916 return (error); 917 break; 918 case TIOCGETA: { /* get termios struct */ 919 struct termios *t = (struct termios *)data; 920 921 bcopy(&tp->t_termios, t, sizeof(struct termios)); 922 break; 923 } 924 case TIOCGETD: /* get line discipline */ 925 *(int *)data = tp->t_line; 926 break; 927 case TIOCGWINSZ: /* get window size */ 928 *(struct winsize *)data = tp->t_winsize; 929 break; 930 case TIOCGPGRP: /* get pgrp of tty */ 931 if (!isctty(p, tp)) 932 return (ENOTTY); 933 *(int *)data = tp->t_pgrp ? tp->t_pgrp->pg_id : NO_PID; 934 break; 935 case TIOCGSID: /* get sid of tty */ 936 if (!isctty(p, tp)) 937 return (ENOTTY); 938 *(int *)data = tp->t_session->s_sid; 939 break; 940 #ifdef TIOCHPCL 941 case TIOCHPCL: /* hang up on last close */ 942 crit_enter(); 943 SET(tp->t_cflag, HUPCL); 944 crit_exit(); 945 break; 946 #endif 947 case TIOCNXCL: /* reset exclusive use of tty */ 948 crit_enter(); 949 CLR(tp->t_state, TS_XCLUDE); 950 crit_exit(); 951 break; 952 case TIOCOUTQ: /* output queue size */ 953 *(int *)data = tp->t_outq.c_cc; 954 break; 955 case TIOCSETA: /* set termios struct */ 956 case TIOCSETAW: /* drain output, set */ 957 case TIOCSETAF: { /* drn out, fls in, set */ 958 struct termios *t = (struct termios *)data; 959 960 if (t->c_ispeed == 0) 961 t->c_ispeed = t->c_ospeed; 962 if (t->c_ispeed == 0) 963 t->c_ispeed = tp->t_ospeed; 964 if (t->c_ispeed == 0) 965 return (EINVAL); 966 crit_enter(); 967 if (cmd == TIOCSETAW || cmd == TIOCSETAF) { 968 error = ttywait(tp); 969 if (error) { 970 crit_exit(); 971 return (error); 972 } 973 if (cmd == TIOCSETAF) 974 ttyflush(tp, FREAD); 975 } 976 if (!ISSET(t->c_cflag, CIGNORE)) { 977 /* 978 * Set device hardware. 979 */ 980 if (tp->t_param && (error = (*tp->t_param)(tp, t))) { 981 crit_exit(); 982 return (error); 983 } 984 if (ISSET(t->c_cflag, CLOCAL) && 985 !ISSET(tp->t_cflag, CLOCAL)) { 986 /* 987 * XXX disconnections would be too hard to 988 * get rid of without this kludge. The only 989 * way to get rid of controlling terminals 990 * is to exit from the session leader. 991 */ 992 CLR(tp->t_state, TS_ZOMBIE); 993 994 wakeup(TSA_CARR_ON(tp)); 995 ttwakeup(tp); 996 ttwwakeup(tp); 997 } 998 if ((ISSET(tp->t_state, TS_CARR_ON) || 999 ISSET(t->c_cflag, CLOCAL)) && 1000 !ISSET(tp->t_state, TS_ZOMBIE)) 1001 SET(tp->t_state, TS_CONNECTED); 1002 else 1003 CLR(tp->t_state, TS_CONNECTED); 1004 tp->t_cflag = t->c_cflag; 1005 tp->t_ispeed = t->c_ispeed; 1006 if (t->c_ospeed != 0) 1007 tp->t_ospeed = t->c_ospeed; 1008 ttsetwater(tp); 1009 } 1010 if (ISSET(t->c_lflag, ICANON) != ISSET(tp->t_lflag, ICANON) && 1011 cmd != TIOCSETAF) { 1012 if (ISSET(t->c_lflag, ICANON)) 1013 SET(tp->t_lflag, PENDIN); 1014 else { 1015 /* 1016 * XXX we really shouldn't allow toggling 1017 * ICANON while we're in a non-termios line 1018 * discipline. Now we have to worry about 1019 * panicing for a null queue. 1020 */ 1021 if (tp->t_canq.c_cbreserved > 0 && 1022 tp->t_rawq.c_cbreserved > 0) { 1023 catq(&tp->t_rawq, &tp->t_canq); 1024 /* 1025 * XXX the queue limits may be 1026 * different, so the old queue 1027 * swapping method no longer works. 1028 */ 1029 catq(&tp->t_canq, &tp->t_rawq); 1030 } 1031 CLR(tp->t_lflag, PENDIN); 1032 } 1033 ttwakeup(tp); 1034 } 1035 tp->t_iflag = t->c_iflag; 1036 tp->t_oflag = t->c_oflag; 1037 /* 1038 * Make the EXTPROC bit read only. 1039 */ 1040 if (ISSET(tp->t_lflag, EXTPROC)) 1041 SET(t->c_lflag, EXTPROC); 1042 else 1043 CLR(t->c_lflag, EXTPROC); 1044 tp->t_lflag = t->c_lflag | ISSET(tp->t_lflag, PENDIN); 1045 if (t->c_cc[VMIN] != tp->t_cc[VMIN] || 1046 t->c_cc[VTIME] != tp->t_cc[VTIME]) 1047 ttwakeup(tp); 1048 bcopy(t->c_cc, tp->t_cc, sizeof(t->c_cc)); 1049 crit_exit(); 1050 break; 1051 } 1052 case TIOCSETD: { /* set line discipline */ 1053 int t = *(int *)data; 1054 cdev_t device = tp->t_dev; 1055 1056 if ((u_int)t >= nlinesw) 1057 return (ENXIO); 1058 if (t != tp->t_line) { 1059 crit_enter(); 1060 (*linesw[tp->t_line].l_close)(tp, flag); 1061 error = (*linesw[t].l_open)(device, tp); 1062 if (error) { 1063 (void)(*linesw[tp->t_line].l_open)(device, tp); 1064 crit_exit(); 1065 return (error); 1066 } 1067 tp->t_line = t; 1068 crit_exit(); 1069 } 1070 break; 1071 } 1072 case TIOCSTART: /* start output, like ^Q */ 1073 crit_enter(); 1074 if (ISSET(tp->t_state, TS_TTSTOP) || 1075 ISSET(tp->t_lflag, FLUSHO)) { 1076 CLR(tp->t_lflag, FLUSHO); 1077 CLR(tp->t_state, TS_TTSTOP); 1078 ttstart(tp); 1079 } 1080 crit_exit(); 1081 break; 1082 case TIOCSTI: /* simulate terminal input */ 1083 if ((flag & FREAD) == 0 && priv_check(td, PRIV_ROOT)) 1084 return (EPERM); 1085 if (!isctty(p, tp) && priv_check(td, PRIV_ROOT)) 1086 return (EACCES); 1087 crit_enter(); 1088 (*linesw[tp->t_line].l_rint)(*(u_char *)data, tp); 1089 crit_exit(); 1090 break; 1091 case TIOCSTOP: /* stop output, like ^S */ 1092 crit_enter(); 1093 if (!ISSET(tp->t_state, TS_TTSTOP)) { 1094 SET(tp->t_state, TS_TTSTOP); 1095 (*tp->t_stop)(tp, 0); 1096 } 1097 crit_exit(); 1098 break; 1099 case TIOCSCTTY: /* become controlling tty */ 1100 /* Session ctty vnode pointer set in vnode layer. */ 1101 if (!SESS_LEADER(p) || 1102 ((p->p_session->s_ttyvp || tp->t_session) && 1103 (tp->t_session != p->p_session))) 1104 return (EPERM); 1105 tp->t_session = p->p_session; 1106 tp->t_pgrp = p->p_pgrp; 1107 p->p_session->s_ttyp = tp; 1108 p->p_flag |= P_CONTROLT; 1109 break; 1110 case TIOCSPGRP: { /* set pgrp of tty */ 1111 pid_t pgid = *(int *)data; 1112 1113 if (!isctty(p, tp)) 1114 return (ENOTTY); 1115 else if (pgid < 1 || pgid > PID_MAX) 1116 return (EINVAL); 1117 else { 1118 struct pgrp *pgrp = pgfind(pgid); 1119 if (pgrp == NULL || pgrp->pg_session != p->p_session) 1120 return (EPERM); 1121 1122 tp->t_pgrp = pgrp; 1123 } 1124 break; 1125 } 1126 case TIOCSTAT: /* simulate control-T */ 1127 crit_enter(); 1128 ttyinfo(tp); 1129 crit_exit(); 1130 break; 1131 case TIOCSWINSZ: /* set window size */ 1132 if (bcmp((caddr_t)&tp->t_winsize, data, 1133 sizeof (struct winsize))) { 1134 tp->t_winsize = *(struct winsize *)data; 1135 pgsignal(tp->t_pgrp, SIGWINCH, 1); 1136 } 1137 break; 1138 case TIOCSDRAINWAIT: 1139 error = priv_check(td, PRIV_ROOT); 1140 if (error) 1141 return (error); 1142 tp->t_timeout = *(int *)data * hz; 1143 wakeup(TSA_OCOMPLETE(tp)); 1144 wakeup(TSA_OLOWAT(tp)); 1145 break; 1146 case TIOCGDRAINWAIT: 1147 *(int *)data = tp->t_timeout / hz; 1148 break; 1149 default: 1150 #if defined(COMPAT_43) || defined(COMPAT_SUNOS) 1151 return (ttcompat(tp, cmd, data, flag)); 1152 #else 1153 return (ENOIOCTL); 1154 #endif 1155 } 1156 return (0); 1157 } 1158 1159 static struct filterops ttyread_filtops = 1160 { FILTEROP_ISFD, NULL, filt_ttyrdetach, filt_ttyread }; 1161 static struct filterops ttywrite_filtops = 1162 { FILTEROP_ISFD, NULL, filt_ttywdetach, filt_ttywrite }; 1163 1164 int 1165 ttykqfilter(struct dev_kqfilter_args *ap) 1166 { 1167 cdev_t dev = ap->a_head.a_dev; 1168 struct knote *kn = ap->a_kn; 1169 struct tty *tp = dev->si_tty; 1170 struct klist *klist; 1171 1172 ap->a_result = 0; 1173 switch (kn->kn_filter) { 1174 case EVFILT_READ: 1175 klist = &tp->t_rkq.ki_note; 1176 kn->kn_fop = &ttyread_filtops; 1177 break; 1178 case EVFILT_WRITE: 1179 klist = &tp->t_wkq.ki_note; 1180 kn->kn_fop = &ttywrite_filtops; 1181 break; 1182 default: 1183 ap->a_result = EOPNOTSUPP; 1184 return (0); 1185 } 1186 1187 kn->kn_hook = (caddr_t)dev; 1188 knote_insert(klist, kn); 1189 1190 return (0); 1191 } 1192 1193 static void 1194 filt_ttyrdetach(struct knote *kn) 1195 { 1196 struct tty *tp = ((cdev_t)kn->kn_hook)->si_tty; 1197 1198 knote_remove(&tp->t_rkq.ki_note, kn); 1199 } 1200 1201 static int 1202 filt_ttyread(struct knote *kn, long hint) 1203 { 1204 struct tty *tp = ((cdev_t)kn->kn_hook)->si_tty; 1205 1206 kn->kn_data = ttnread(tp); 1207 if (ISSET(tp->t_state, TS_ZOMBIE)) { 1208 kn->kn_flags |= EV_EOF; 1209 return (1); 1210 } 1211 return (kn->kn_data > 0); 1212 } 1213 1214 static void 1215 filt_ttywdetach(struct knote *kn) 1216 { 1217 struct tty *tp = ((cdev_t)kn->kn_hook)->si_tty; 1218 1219 knote_remove(&tp->t_wkq.ki_note, kn); 1220 } 1221 1222 static int 1223 filt_ttywrite(struct knote *kn, long hint) 1224 { 1225 struct tty *tp = ((cdev_t)kn->kn_hook)->si_tty; 1226 1227 kn->kn_data = tp->t_outq.c_cc; 1228 if (ISSET(tp->t_state, TS_ZOMBIE)) 1229 return (1); 1230 return (kn->kn_data <= tp->t_olowat && 1231 ISSET(tp->t_state, TS_CONNECTED)); 1232 } 1233 1234 /* 1235 * Must be called while in a critical section. 1236 */ 1237 static int 1238 ttnread(struct tty *tp) 1239 { 1240 int nread; 1241 1242 if (ISSET(tp->t_lflag, PENDIN)) 1243 ttypend(tp); 1244 nread = tp->t_canq.c_cc; 1245 if (!ISSET(tp->t_lflag, ICANON)) { 1246 nread += tp->t_rawq.c_cc; 1247 if (nread < tp->t_cc[VMIN] && tp->t_cc[VTIME] == 0) 1248 nread = 0; 1249 } 1250 return (nread); 1251 } 1252 1253 /* 1254 * Wait for output to drain. 1255 */ 1256 int 1257 ttywait(struct tty *tp) 1258 { 1259 int error; 1260 1261 error = 0; 1262 crit_enter(); 1263 while ((tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY)) && 1264 ISSET(tp->t_state, TS_CONNECTED) && tp->t_oproc) { 1265 (*tp->t_oproc)(tp); 1266 if ((tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY)) && 1267 ISSET(tp->t_state, TS_CONNECTED)) { 1268 SET(tp->t_state, TS_SO_OCOMPLETE); 1269 error = ttysleep(tp, TSA_OCOMPLETE(tp), 1270 PCATCH, "ttywai", 1271 tp->t_timeout); 1272 if (error) { 1273 if (error == EWOULDBLOCK) 1274 error = EIO; 1275 break; 1276 } 1277 } else 1278 break; 1279 } 1280 if (!error && (tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY))) 1281 error = EIO; 1282 crit_exit(); 1283 return (error); 1284 } 1285 1286 /* 1287 * Flush if successfully wait. 1288 */ 1289 static int 1290 ttywflush(struct tty *tp) 1291 { 1292 int error; 1293 1294 if ((error = ttywait(tp)) == 0) 1295 ttyflush(tp, FREAD); 1296 return (error); 1297 } 1298 1299 /* 1300 * Flush tty read and/or write queues, notifying anyone waiting. 1301 */ 1302 void 1303 ttyflush(struct tty *tp, int rw) 1304 { 1305 crit_enter(); 1306 #if 0 1307 again: 1308 #endif 1309 if (rw & FWRITE) { 1310 FLUSHQ(&tp->t_outq); 1311 CLR(tp->t_state, TS_TTSTOP); 1312 } 1313 (*tp->t_stop)(tp, rw); 1314 if (rw & FREAD) { 1315 FLUSHQ(&tp->t_canq); 1316 FLUSHQ(&tp->t_rawq); 1317 CLR(tp->t_lflag, PENDIN); 1318 tp->t_rocount = 0; 1319 tp->t_rocol = 0; 1320 CLR(tp->t_state, TS_LOCAL); 1321 ttwakeup(tp); 1322 if (ISSET(tp->t_state, TS_TBLOCK)) { 1323 if (rw & FWRITE) 1324 FLUSHQ(&tp->t_outq); 1325 ttyunblock(tp); 1326 1327 /* 1328 * Don't let leave any state that might clobber the 1329 * next line discipline (although we should do more 1330 * to send the START char). Not clearing the state 1331 * may have caused the "putc to a clist with no 1332 * reserved cblocks" panic/kprintf. 1333 */ 1334 CLR(tp->t_state, TS_TBLOCK); 1335 1336 #if 0 /* forget it, sleeping isn't always safe and we don't know when it is */ 1337 if (ISSET(tp->t_iflag, IXOFF)) { 1338 /* 1339 * XXX wait a bit in the hope that the stop 1340 * character (if any) will go out. Waiting 1341 * isn't good since it allows races. This 1342 * will be fixed when the stop character is 1343 * put in a special queue. Don't bother with 1344 * the checks in ttywait() since the timeout 1345 * will save us. 1346 */ 1347 SET(tp->t_state, TS_SO_OCOMPLETE); 1348 ttysleep(tp, TSA_OCOMPLETE(tp), 0, 1349 "ttyfls", hz / 10); 1350 /* 1351 * Don't try sending the stop character again. 1352 */ 1353 CLR(tp->t_state, TS_TBLOCK); 1354 goto again; 1355 } 1356 #endif 1357 } 1358 } 1359 if (rw & FWRITE) { 1360 FLUSHQ(&tp->t_outq); 1361 ttwwakeup(tp); 1362 } 1363 crit_exit(); 1364 } 1365 1366 /* 1367 * Copy in the default termios characters. 1368 */ 1369 void 1370 termioschars(struct termios *t) 1371 { 1372 1373 bcopy(ttydefchars, t->c_cc, sizeof t->c_cc); 1374 } 1375 1376 /* 1377 * Old interface. 1378 */ 1379 void 1380 ttychars(struct tty *tp) 1381 { 1382 1383 termioschars(&tp->t_termios); 1384 } 1385 1386 /* 1387 * Handle input high water. Send stop character for the IXOFF case. Turn 1388 * on our input flow control bit and propagate the changes to the driver. 1389 * XXX the stop character should be put in a special high priority queue. 1390 */ 1391 void 1392 ttyblock(struct tty *tp) 1393 { 1394 1395 SET(tp->t_state, TS_TBLOCK); 1396 if (ISSET(tp->t_iflag, IXOFF) && tp->t_cc[VSTOP] != _POSIX_VDISABLE && 1397 clist_putc(tp->t_cc[VSTOP], &tp->t_outq) != 0) 1398 CLR(tp->t_state, TS_TBLOCK); /* try again later */ 1399 ttstart(tp); 1400 } 1401 1402 /* 1403 * Handle input low water. Send start character for the IXOFF case. Turn 1404 * off our input flow control bit and propagate the changes to the driver. 1405 * XXX the start character should be put in a special high priority queue. 1406 */ 1407 static void 1408 ttyunblock(struct tty *tp) 1409 { 1410 1411 CLR(tp->t_state, TS_TBLOCK); 1412 if (ISSET(tp->t_iflag, IXOFF) && tp->t_cc[VSTART] != _POSIX_VDISABLE && 1413 clist_putc(tp->t_cc[VSTART], &tp->t_outq) != 0) 1414 SET(tp->t_state, TS_TBLOCK); /* try again later */ 1415 ttstart(tp); 1416 } 1417 1418 #ifdef notyet 1419 /* Not used by any current (i386) drivers. */ 1420 /* 1421 * Restart after an inter-char delay. 1422 */ 1423 void 1424 ttrstrt(void *tp_arg) 1425 { 1426 struct tty *tp; 1427 1428 KASSERT(tp_arg != NULL, ("ttrstrt")); 1429 1430 tp = tp_arg; 1431 crit_enter(); 1432 CLR(tp->t_state, TS_TIMEOUT); 1433 ttstart(tp); 1434 crit_exit(); 1435 } 1436 #endif 1437 1438 int 1439 ttstart(struct tty *tp) 1440 { 1441 1442 if (tp->t_oproc != NULL) /* XXX: Kludge for pty. */ 1443 (*tp->t_oproc)(tp); 1444 return (0); 1445 } 1446 1447 /* 1448 * "close" a line discipline 1449 */ 1450 int 1451 ttylclose(struct tty *tp, int flag) 1452 { 1453 1454 if (flag & FNONBLOCK || ttywflush(tp)) 1455 ttyflush(tp, FREAD | FWRITE); 1456 return (0); 1457 } 1458 1459 /* 1460 * Handle modem control transition on a tty. 1461 * Flag indicates new state of carrier. 1462 * Returns 0 if the line should be turned off, otherwise 1. 1463 */ 1464 int 1465 ttymodem(struct tty *tp, int flag) 1466 { 1467 1468 if (ISSET(tp->t_state, TS_CARR_ON) && ISSET(tp->t_cflag, MDMBUF)) { 1469 /* 1470 * MDMBUF: do flow control according to carrier flag 1471 * XXX TS_CAR_OFLOW doesn't do anything yet. TS_TTSTOP 1472 * works if IXON and IXANY are clear. 1473 */ 1474 if (flag) { 1475 CLR(tp->t_state, TS_CAR_OFLOW); 1476 CLR(tp->t_state, TS_TTSTOP); 1477 ttstart(tp); 1478 } else if (!ISSET(tp->t_state, TS_CAR_OFLOW)) { 1479 SET(tp->t_state, TS_CAR_OFLOW); 1480 SET(tp->t_state, TS_TTSTOP); 1481 (*tp->t_stop)(tp, 0); 1482 } 1483 } else if (flag == 0) { 1484 /* 1485 * Lost carrier. 1486 */ 1487 CLR(tp->t_state, TS_CARR_ON); 1488 if (ISSET(tp->t_state, TS_ISOPEN) && 1489 !ISSET(tp->t_cflag, CLOCAL)) { 1490 SET(tp->t_state, TS_ZOMBIE); 1491 CLR(tp->t_state, TS_CONNECTED); 1492 if (tp->t_session && tp->t_session->s_leader) 1493 ksignal(tp->t_session->s_leader, SIGHUP); 1494 ttyflush(tp, FREAD | FWRITE); 1495 return (0); 1496 } 1497 } else { 1498 /* 1499 * Carrier now on. 1500 */ 1501 SET(tp->t_state, TS_CARR_ON); 1502 if (!ISSET(tp->t_state, TS_ZOMBIE)) 1503 SET(tp->t_state, TS_CONNECTED); 1504 wakeup(TSA_CARR_ON(tp)); 1505 ttwakeup(tp); 1506 ttwwakeup(tp); 1507 } 1508 return (1); 1509 } 1510 1511 /* 1512 * Reinput pending characters after state switch 1513 * call from a critical section. 1514 */ 1515 static void 1516 ttypend(struct tty *tp) 1517 { 1518 struct clist tq; 1519 int c; 1520 1521 CLR(tp->t_lflag, PENDIN); 1522 SET(tp->t_state, TS_TYPEN); 1523 /* 1524 * XXX this assumes too much about clist internals. It may even 1525 * fail if the cblock slush pool is empty. We can't allocate more 1526 * cblocks here because we are called from an interrupt handler 1527 * and clist_alloc_cblocks() can wait. 1528 */ 1529 tq = tp->t_rawq; 1530 bzero(&tp->t_rawq, sizeof tp->t_rawq); 1531 tp->t_rawq.c_cbmax = tq.c_cbmax; 1532 tp->t_rawq.c_cbreserved = tq.c_cbreserved; 1533 while ((c = clist_getc(&tq)) >= 0) 1534 ttyinput(c, tp); 1535 CLR(tp->t_state, TS_TYPEN); 1536 } 1537 1538 /* 1539 * Process a read call on a tty device. 1540 */ 1541 int 1542 ttread(struct tty *tp, struct uio *uio, int flag) 1543 { 1544 struct clist *qp; 1545 int c; 1546 tcflag_t lflag; 1547 cc_t *cc = tp->t_cc; 1548 struct proc *pp; 1549 struct lwp *lp; 1550 int first, error = 0; 1551 int has_stime = 0, last_cc = 0; 1552 long slp = 0; /* XXX this should be renamed `timo'. */ 1553 struct timeval stime; 1554 1555 lp = curthread->td_lwp; 1556 stime.tv_sec = 0; /* fix compiler warnings */ 1557 stime.tv_usec = 0; 1558 1559 loop: 1560 crit_enter(); 1561 lflag = tp->t_lflag; 1562 /* 1563 * take pending input first 1564 */ 1565 if (ISSET(lflag, PENDIN)) { 1566 ttypend(tp); 1567 splz(); /* reduce latency */ 1568 lflag = tp->t_lflag; /* XXX ttypend() clobbers it */ 1569 } 1570 1571 /* 1572 * Hang process if it's in the background. 1573 */ 1574 if ((pp = curproc) && isbackground(pp, tp)) { 1575 crit_exit(); 1576 if (SIGISMEMBER(pp->p_sigignore, SIGTTIN) || 1577 SIGISMEMBER(lp->lwp_sigmask, SIGTTIN) || 1578 (pp->p_flag & P_PPWAIT) || pp->p_pgrp->pg_jobc == 0) 1579 return (EIO); 1580 pgsignal(pp->p_pgrp, SIGTTIN, 1); 1581 error = ttysleep(tp, &lbolt, PCATCH, "ttybg2", 0); 1582 if (error) 1583 return (error); 1584 goto loop; 1585 } 1586 1587 if (ISSET(tp->t_state, TS_ZOMBIE)) { 1588 crit_exit(); 1589 return (0); /* EOF */ 1590 } 1591 1592 /* 1593 * If canonical, use the canonical queue, 1594 * else use the raw queue. 1595 * 1596 * (should get rid of clists...) 1597 */ 1598 qp = ISSET(lflag, ICANON) ? &tp->t_canq : &tp->t_rawq; 1599 1600 if (flag & IO_NDELAY) { 1601 if (qp->c_cc > 0) 1602 goto read; 1603 if (!ISSET(lflag, ICANON) && cc[VMIN] == 0) { 1604 crit_exit(); 1605 return (0); 1606 } 1607 crit_exit(); 1608 return (EWOULDBLOCK); 1609 } 1610 if (!ISSET(lflag, ICANON)) { 1611 int m = cc[VMIN]; 1612 long t = cc[VTIME]; 1613 struct timeval timecopy; 1614 1615 /* 1616 * Check each of the four combinations. 1617 * (m > 0 && t == 0) is the normal read case. 1618 * It should be fairly efficient, so we check that and its 1619 * companion case (m == 0 && t == 0) first. 1620 * For the other two cases, we compute the target sleep time 1621 * into slp. 1622 */ 1623 if (t == 0) { 1624 if (qp->c_cc < m) 1625 goto sleep; 1626 if (qp->c_cc > 0) 1627 goto read; 1628 1629 /* m, t and qp->c_cc are all 0. 0 is enough input. */ 1630 crit_exit(); 1631 return (0); 1632 } 1633 t *= 100000; /* time in us */ 1634 #define diff(t1, t2) (((t1).tv_sec - (t2).tv_sec) * 1000000 + \ 1635 ((t1).tv_usec - (t2).tv_usec)) 1636 if (m > 0) { 1637 if (qp->c_cc <= 0) 1638 goto sleep; 1639 if (qp->c_cc >= m) 1640 goto read; 1641 getmicrotime(&timecopy); 1642 if (has_stime == 0) { 1643 /* first character, start timer */ 1644 has_stime = 1; 1645 stime = timecopy; 1646 slp = t; 1647 } else if (qp->c_cc > last_cc) { 1648 /* got a character, restart timer */ 1649 stime = timecopy; 1650 slp = t; 1651 } else { 1652 /* nothing, check expiration */ 1653 slp = t - diff(timecopy, stime); 1654 if (slp <= 0) 1655 goto read; 1656 } 1657 last_cc = qp->c_cc; 1658 } else { /* m == 0 */ 1659 if (qp->c_cc > 0) 1660 goto read; 1661 getmicrotime(&timecopy); 1662 if (has_stime == 0) { 1663 has_stime = 1; 1664 stime = timecopy; 1665 slp = t; 1666 } else { 1667 slp = t - diff(timecopy, stime); 1668 if (slp <= 0) { 1669 /* Timed out, but 0 is enough input. */ 1670 crit_exit(); 1671 return (0); 1672 } 1673 } 1674 } 1675 #undef diff 1676 /* 1677 * Rounding down may make us wake up just short 1678 * of the target, so we round up. 1679 * The formula is ceiling(slp * hz/1000000). 1680 * 32-bit arithmetic is enough for hz < 169. 1681 * XXX see tvtohz() for how to avoid overflow if hz 1682 * is large (divide by `tick' and/or arrange to 1683 * use tvtohz() if hz is large). 1684 */ 1685 slp = (long) (((u_long)slp * hz) + 999999) / 1000000; 1686 goto sleep; 1687 } 1688 if (qp->c_cc <= 0) { 1689 sleep: 1690 /* 1691 * There is no input, or not enough input and we can block. 1692 */ 1693 error = ttysleep(tp, TSA_HUP_OR_INPUT(tp), PCATCH, 1694 ISSET(tp->t_state, TS_CONNECTED) ? 1695 "ttyin" : "ttyhup", (int)slp); 1696 crit_exit(); 1697 if (error == EWOULDBLOCK) 1698 error = 0; 1699 else if (error) 1700 return (error); 1701 /* 1702 * XXX what happens if another process eats some input 1703 * while we are asleep (not just here)? It would be 1704 * safest to detect changes and reset our state variables 1705 * (has_stime and last_cc). 1706 */ 1707 slp = 0; 1708 goto loop; 1709 } 1710 read: 1711 crit_exit(); 1712 /* 1713 * Input present, check for input mapping and processing. 1714 */ 1715 first = 1; 1716 if (ISSET(lflag, ICANON | ISIG)) 1717 goto slowcase; 1718 for (;;) { 1719 char ibuf[IBUFSIZ]; 1720 int icc; 1721 1722 icc = (int)szmin(uio->uio_resid, IBUFSIZ); 1723 icc = q_to_b(qp, ibuf, icc); 1724 if (icc <= 0) { 1725 if (first) 1726 goto loop; 1727 break; 1728 } 1729 error = uiomove(ibuf, (size_t)icc, uio); 1730 /* 1731 * XXX if there was an error then we should ungetc() the 1732 * unmoved chars and reduce icc here. 1733 */ 1734 if (error) 1735 break; 1736 if (uio->uio_resid == 0) 1737 break; 1738 first = 0; 1739 } 1740 goto out; 1741 slowcase: 1742 for (;;) { 1743 c = clist_getc(qp); 1744 if (c < 0) { 1745 if (first) 1746 goto loop; 1747 break; 1748 } 1749 /* 1750 * delayed suspend (^Y) 1751 */ 1752 if (CCEQ(cc[VDSUSP], c) && 1753 ISSET(lflag, IEXTEN | ISIG) == (IEXTEN | ISIG)) { 1754 pgsignal(tp->t_pgrp, SIGTSTP, 1); 1755 if (first) { 1756 error = ttysleep(tp, &lbolt, PCATCH, 1757 "ttybg3", 0); 1758 if (error) 1759 break; 1760 goto loop; 1761 } 1762 break; 1763 } 1764 /* 1765 * Interpret EOF only in canonical mode. 1766 */ 1767 if (CCEQ(cc[VEOF], c) && ISSET(lflag, ICANON)) 1768 break; 1769 /* 1770 * Give user character. 1771 */ 1772 error = ureadc(c, uio); 1773 if (error) 1774 /* XXX should ungetc(c, qp). */ 1775 break; 1776 if (uio->uio_resid == 0) 1777 break; 1778 /* 1779 * In canonical mode check for a "break character" 1780 * marking the end of a "line of input". 1781 */ 1782 if (ISSET(lflag, ICANON) && TTBREAKC(c, lflag)) 1783 break; 1784 first = 0; 1785 } 1786 1787 out: 1788 /* 1789 * Look to unblock input now that (presumably) 1790 * the input queue has gone down. 1791 */ 1792 crit_enter(); 1793 if (ISSET(tp->t_state, TS_TBLOCK) && 1794 tp->t_rawq.c_cc + tp->t_canq.c_cc <= tp->t_ilowat) 1795 ttyunblock(tp); 1796 crit_exit(); 1797 1798 return (error); 1799 } 1800 1801 /* 1802 * Check the output queue on tp for space for a kernel message (from uprintf 1803 * or tprintf). Allow some space over the normal hiwater mark so we don't 1804 * lose messages due to normal flow control, but don't let the tty run amok. 1805 * Sleeps here are not interruptible, but we return prematurely if new signals 1806 * arrive. 1807 */ 1808 int 1809 ttycheckoutq(struct tty *tp, int wait) 1810 { 1811 struct lwp *lp = curthread->td_lwp; 1812 int hiwat; 1813 sigset_t oldset, newset; 1814 1815 hiwat = tp->t_ohiwat; 1816 SIGEMPTYSET(oldset); 1817 SIGEMPTYSET(newset); 1818 crit_enter(); 1819 if (wait) 1820 oldset = lwp_sigpend(lp); 1821 if (tp->t_outq.c_cc > hiwat + OBUFSIZ + 100) { 1822 while (tp->t_outq.c_cc > hiwat) { 1823 ttstart(tp); 1824 if (tp->t_outq.c_cc <= hiwat) 1825 break; 1826 if (wait) 1827 newset = lwp_sigpend(lp); 1828 if (!wait || SIGSETNEQ(oldset, newset)) { 1829 crit_exit(); 1830 return (0); 1831 } 1832 SET(tp->t_state, TS_SO_OLOWAT); 1833 tsleep(TSA_OLOWAT(tp), 0, "ttoutq", hz); 1834 } 1835 } 1836 crit_exit(); 1837 return (1); 1838 } 1839 1840 /* 1841 * Process a write call on a tty device. 1842 */ 1843 int 1844 ttwrite(struct tty *tp, struct uio *uio, int flag) 1845 { 1846 char *cp = NULL; 1847 int cc, ce; 1848 struct proc *pp; 1849 struct lwp *lp; 1850 int i, hiwat, error; 1851 size_t cnt; 1852 1853 char obuf[OBUFSIZ]; 1854 1855 lp = curthread->td_lwp; 1856 hiwat = tp->t_ohiwat; 1857 cnt = uio->uio_resid; 1858 error = 0; 1859 cc = 0; 1860 loop: 1861 crit_enter(); 1862 if (ISSET(tp->t_state, TS_ZOMBIE)) { 1863 crit_exit(); 1864 if (uio->uio_resid == cnt) 1865 error = EIO; 1866 goto out; 1867 } 1868 if (!ISSET(tp->t_state, TS_CONNECTED)) { 1869 if (flag & IO_NDELAY) { 1870 crit_exit(); 1871 error = EWOULDBLOCK; 1872 goto out; 1873 } 1874 error = ttysleep(tp, TSA_CARR_ON(tp), PCATCH, "ttydcd", 0); 1875 crit_exit(); 1876 if (error) 1877 goto out; 1878 goto loop; 1879 } 1880 crit_exit(); 1881 1882 /* 1883 * Hang the process if it's in the background. 1884 */ 1885 if ((pp = curproc) && isbackground(pp, tp) && 1886 ISSET(tp->t_lflag, TOSTOP) && !(pp->p_flag & P_PPWAIT) && 1887 !SIGISMEMBER(pp->p_sigignore, SIGTTOU) && 1888 !SIGISMEMBER(lp->lwp_sigmask, SIGTTOU)) { 1889 if (pp->p_pgrp->pg_jobc == 0) { 1890 error = EIO; 1891 goto out; 1892 } 1893 pgsignal(pp->p_pgrp, SIGTTOU, 1); 1894 error = ttysleep(tp, &lbolt, PCATCH, "ttybg4", 0); 1895 if (error) 1896 goto out; 1897 goto loop; 1898 } 1899 /* 1900 * Process the user's data in at most OBUFSIZ chunks. Perform any 1901 * output translation. Keep track of high water mark, sleep on 1902 * overflow awaiting device aid in acquiring new space. 1903 */ 1904 while (uio->uio_resid > 0 || cc > 0) { 1905 if (ISSET(tp->t_lflag, FLUSHO)) { 1906 uio->uio_resid = 0; 1907 return (0); 1908 } 1909 if (tp->t_outq.c_cc > hiwat) 1910 goto ovhiwat; 1911 /* 1912 * Grab a hunk of data from the user, unless we have some 1913 * leftover from last time. 1914 */ 1915 if (cc == 0) { 1916 cc = szmin(uio->uio_resid, OBUFSIZ); 1917 cp = obuf; 1918 error = uiomove(cp, (size_t)cc, uio); 1919 if (error) { 1920 cc = 0; 1921 break; 1922 } 1923 } 1924 /* 1925 * If nothing fancy need be done, grab those characters we 1926 * can handle without any of ttyoutput's processing and 1927 * just transfer them to the output q. For those chars 1928 * which require special processing (as indicated by the 1929 * bits in char_type), call ttyoutput. After processing 1930 * a hunk of data, look for FLUSHO so ^O's will take effect 1931 * immediately. 1932 */ 1933 while (cc > 0) { 1934 if (!ISSET(tp->t_oflag, OPOST)) 1935 ce = cc; 1936 else { 1937 ce = cc - scanc((u_int)cc, (u_char *)cp, 1938 char_type, CCLASSMASK); 1939 /* 1940 * If ce is zero, then we're processing 1941 * a special character through ttyoutput. 1942 */ 1943 if (ce == 0) { 1944 tp->t_rocount = 0; 1945 if (ttyoutput(*cp, tp) >= 0) { 1946 /* No Clists, wait a bit. */ 1947 ttstart(tp); 1948 if (flag & IO_NDELAY) { 1949 error = EWOULDBLOCK; 1950 goto out; 1951 } 1952 error = ttysleep(tp, &lbolt, 1953 PCATCH, 1954 "ttybf1", 0); 1955 if (error) 1956 goto out; 1957 goto loop; 1958 } 1959 cp++; 1960 cc--; 1961 if (ISSET(tp->t_lflag, FLUSHO) || 1962 tp->t_outq.c_cc > hiwat) 1963 goto ovhiwat; 1964 continue; 1965 } 1966 } 1967 /* 1968 * A bunch of normal characters have been found. 1969 * Transfer them en masse to the output queue and 1970 * continue processing at the top of the loop. 1971 * If there are any further characters in this 1972 * <= OBUFSIZ chunk, the first should be a character 1973 * requiring special handling by ttyoutput. 1974 */ 1975 tp->t_rocount = 0; 1976 i = b_to_q(cp, ce, &tp->t_outq); 1977 ce -= i; 1978 tp->t_column += ce; 1979 cp += ce, cc -= ce, tk_nout += ce; 1980 tp->t_outcc += ce; 1981 if (i > 0) { 1982 /* No Clists, wait a bit. */ 1983 ttstart(tp); 1984 if (flag & IO_NDELAY) { 1985 error = EWOULDBLOCK; 1986 goto out; 1987 } 1988 error = ttysleep(tp, &lbolt, PCATCH, 1989 "ttybf2", 0); 1990 if (error) 1991 goto out; 1992 goto loop; 1993 } 1994 if (ISSET(tp->t_lflag, FLUSHO) || 1995 tp->t_outq.c_cc > hiwat) 1996 break; 1997 } 1998 ttstart(tp); 1999 } 2000 out: 2001 /* 2002 * If cc is nonzero, we leave the uio structure inconsistent, as the 2003 * offset and iov pointers have moved forward, but it doesn't matter 2004 * (the call will either return short or restart with a new uio). 2005 */ 2006 uio->uio_resid += cc; 2007 return (error); 2008 2009 ovhiwat: 2010 ttstart(tp); 2011 crit_enter(); 2012 /* 2013 * This can only occur if FLUSHO is set in t_lflag, 2014 * or if ttstart/oproc is synchronous (or very fast). 2015 */ 2016 if (tp->t_outq.c_cc <= hiwat) { 2017 crit_exit(); 2018 goto loop; 2019 } 2020 if (flag & IO_NDELAY) { 2021 crit_exit(); 2022 uio->uio_resid += cc; 2023 return (uio->uio_resid == cnt ? EWOULDBLOCK : 0); 2024 } 2025 SET(tp->t_state, TS_SO_OLOWAT); 2026 error = ttysleep(tp, TSA_OLOWAT(tp), PCATCH, "ttywri", tp->t_timeout); 2027 crit_exit(); 2028 if (error == EWOULDBLOCK) 2029 error = EIO; 2030 if (error) 2031 goto out; 2032 goto loop; 2033 } 2034 2035 /* 2036 * Rubout one character from the rawq of tp 2037 * as cleanly as possible. 2038 */ 2039 static void 2040 ttyrub(int c, struct tty *tp) 2041 { 2042 char *cp; 2043 int savecol; 2044 int tabc; 2045 2046 if (!ISSET(tp->t_lflag, ECHO) || ISSET(tp->t_lflag, EXTPROC)) 2047 return; 2048 CLR(tp->t_lflag, FLUSHO); 2049 if (ISSET(tp->t_lflag, ECHOE)) { 2050 if (tp->t_rocount == 0) { 2051 /* 2052 * Screwed by ttwrite; retype 2053 */ 2054 ttyretype(tp); 2055 return; 2056 } 2057 if (c == ('\t' | TTY_QUOTE) || c == ('\n' | TTY_QUOTE)) 2058 ttyrubo(tp, 2); 2059 else { 2060 CLR(c, ~TTY_CHARMASK); 2061 switch (CCLASS(c)) { 2062 case ORDINARY: 2063 ttyrubo(tp, 1); 2064 break; 2065 case BACKSPACE: 2066 case CONTROL: 2067 case NEWLINE: 2068 case RETURN: 2069 case VTAB: 2070 if (ISSET(tp->t_lflag, ECHOCTL)) 2071 ttyrubo(tp, 2); 2072 break; 2073 case TAB: 2074 if (tp->t_rocount < tp->t_rawq.c_cc) { 2075 ttyretype(tp); 2076 return; 2077 } 2078 crit_enter(); 2079 savecol = tp->t_column; 2080 SET(tp->t_state, TS_CNTTB); 2081 SET(tp->t_lflag, FLUSHO); 2082 tp->t_column = tp->t_rocol; 2083 cp = tp->t_rawq.c_cf; 2084 if (cp) 2085 tabc = *cp; /* XXX FIX NEXTC */ 2086 for (; cp; cp = nextc(&tp->t_rawq, cp, &tabc)) 2087 ttyecho(tabc, tp); 2088 CLR(tp->t_lflag, FLUSHO); 2089 CLR(tp->t_state, TS_CNTTB); 2090 crit_exit(); 2091 2092 /* savecol will now be length of the tab. */ 2093 savecol -= tp->t_column; 2094 tp->t_column += savecol; 2095 if (savecol > 8) 2096 savecol = 8; /* overflow screw */ 2097 while (--savecol >= 0) 2098 (void)ttyoutput('\b', tp); 2099 break; 2100 default: /* XXX */ 2101 #define PANICSTR "ttyrub: would panic c = %d, val = %d\n" 2102 (void)kprintf(PANICSTR, c, CCLASS(c)); 2103 #ifdef notdef 2104 panic(PANICSTR, c, CCLASS(c)); 2105 #endif 2106 } 2107 } 2108 } else if (ISSET(tp->t_lflag, ECHOPRT)) { 2109 if (!ISSET(tp->t_state, TS_ERASE)) { 2110 SET(tp->t_state, TS_ERASE); 2111 (void)ttyoutput('\\', tp); 2112 } 2113 ttyecho(c, tp); 2114 } else { 2115 ttyecho(tp->t_cc[VERASE], tp); 2116 /* 2117 * This code may be executed not only when an ERASE key 2118 * is pressed, but also when ^U (KILL) or ^W (WERASE) are. 2119 * So, I didn't think it was worthwhile to pass the extra 2120 * information (which would need an extra parameter, 2121 * changing every call) needed to distinguish the ERASE2 2122 * case from the ERASE. 2123 */ 2124 } 2125 --tp->t_rocount; 2126 } 2127 2128 /* 2129 * Back over cnt characters, erasing them. 2130 */ 2131 static void 2132 ttyrubo(struct tty *tp, int cnt) 2133 { 2134 2135 while (cnt-- > 0) { 2136 (void)ttyoutput('\b', tp); 2137 (void)ttyoutput(' ', tp); 2138 (void)ttyoutput('\b', tp); 2139 } 2140 } 2141 2142 /* 2143 * ttyretype -- 2144 * Reprint the rawq line. Note, it is assumed that c_cc has already 2145 * been checked. 2146 */ 2147 static void 2148 ttyretype(struct tty *tp) 2149 { 2150 char *cp; 2151 int c; 2152 2153 /* Echo the reprint character. */ 2154 if (tp->t_cc[VREPRINT] != _POSIX_VDISABLE) 2155 ttyecho(tp->t_cc[VREPRINT], tp); 2156 2157 (void)ttyoutput('\n', tp); 2158 2159 /* 2160 * XXX 2161 * FIX: NEXTC IS BROKEN - DOESN'T CHECK QUOTE 2162 * BIT OF FIRST CHAR. 2163 */ 2164 crit_enter(); 2165 for (cp = tp->t_canq.c_cf, c = (cp != NULL ? *cp : 0); 2166 cp != NULL; cp = nextc(&tp->t_canq, cp, &c)) 2167 ttyecho(c, tp); 2168 for (cp = tp->t_rawq.c_cf, c = (cp != NULL ? *cp : 0); 2169 cp != NULL; cp = nextc(&tp->t_rawq, cp, &c)) 2170 ttyecho(c, tp); 2171 CLR(tp->t_state, TS_ERASE); 2172 crit_exit(); 2173 2174 tp->t_rocount = tp->t_rawq.c_cc; 2175 tp->t_rocol = 0; 2176 } 2177 2178 /* 2179 * Echo a typed character to the terminal. 2180 */ 2181 static void 2182 ttyecho(int c, struct tty *tp) 2183 { 2184 2185 if (!ISSET(tp->t_state, TS_CNTTB)) 2186 CLR(tp->t_lflag, FLUSHO); 2187 if ((!ISSET(tp->t_lflag, ECHO) && 2188 (c != '\n' || !ISSET(tp->t_lflag, ECHONL))) || 2189 ISSET(tp->t_lflag, EXTPROC)) 2190 return; 2191 if (ISSET(tp->t_lflag, ECHOCTL) && 2192 ((ISSET(c, TTY_CHARMASK) <= 037 && c != '\t' && c != '\n') || 2193 ISSET(c, TTY_CHARMASK) == 0177)) { 2194 (void)ttyoutput('^', tp); 2195 CLR(c, ~TTY_CHARMASK); 2196 if (c == 0177) 2197 c = '?'; 2198 else 2199 c += 'A' - 1; 2200 } 2201 (void)ttyoutput(c, tp); 2202 } 2203 2204 /* 2205 * Wake up any readers on a tty. 2206 */ 2207 void 2208 ttwakeup(struct tty *tp) 2209 { 2210 2211 if (ISSET(tp->t_state, TS_ASYNC) && tp->t_sigio != NULL) 2212 pgsigio(tp->t_sigio, SIGIO, (tp->t_session != NULL)); 2213 wakeup(TSA_HUP_OR_INPUT(tp)); 2214 KNOTE(&tp->t_rkq.ki_note, 0); 2215 } 2216 2217 /* 2218 * Wake up any writers on a tty. 2219 */ 2220 void 2221 ttwwakeup(struct tty *tp) 2222 { 2223 2224 if (ISSET(tp->t_state, TS_ASYNC) && tp->t_sigio != NULL) 2225 pgsigio(tp->t_sigio, SIGIO, (tp->t_session != NULL)); 2226 if (ISSET(tp->t_state, TS_BUSY | TS_SO_OCOMPLETE) == 2227 TS_SO_OCOMPLETE && tp->t_outq.c_cc == 0) { 2228 CLR(tp->t_state, TS_SO_OCOMPLETE); 2229 wakeup(TSA_OCOMPLETE(tp)); 2230 } 2231 if (ISSET(tp->t_state, TS_SO_OLOWAT) && 2232 tp->t_outq.c_cc <= tp->t_olowat) { 2233 CLR(tp->t_state, TS_SO_OLOWAT); 2234 wakeup(TSA_OLOWAT(tp)); 2235 } 2236 KNOTE(&tp->t_wkq.ki_note, 0); 2237 } 2238 2239 /* 2240 * Look up a code for a specified speed in a conversion table; 2241 * used by drivers to map software speed values to hardware parameters. 2242 */ 2243 int 2244 ttspeedtab(int speed, struct speedtab *table) 2245 { 2246 2247 for ( ; table->sp_speed != -1; table++) 2248 if (table->sp_speed == speed) 2249 return (table->sp_code); 2250 return (-1); 2251 } 2252 2253 /* 2254 * Set input and output watermarks and buffer sizes. For input, the 2255 * high watermark is about one second's worth of input above empty, the 2256 * low watermark is slightly below high water, and the buffer size is a 2257 * driver-dependent amount above high water. For output, the watermarks 2258 * are near the ends of the buffer, with about 1 second's worth of input 2259 * between them. All this only applies to the standard line discipline. 2260 */ 2261 void 2262 ttsetwater(struct tty *tp) 2263 { 2264 int cps, ttmaxhiwat, x; 2265 2266 /* Input. */ 2267 clist_alloc_cblocks(&tp->t_canq, TTYHOG, 512); 2268 switch (tp->t_ispeedwat) { 2269 case (speed_t)-1: 2270 cps = tp->t_ispeed / 10; 2271 break; 2272 case 0: 2273 /* 2274 * This case is for old drivers that don't know about 2275 * t_ispeedwat. Arrange for them to get the old buffer 2276 * sizes and watermarks. 2277 */ 2278 cps = TTYHOG - 2 * 256; 2279 tp->t_ififosize = 2 * 2048; 2280 break; 2281 default: 2282 cps = tp->t_ispeedwat / 10; 2283 break; 2284 } 2285 tp->t_ihiwat = cps; 2286 tp->t_ilowat = 7 * cps / 8; 2287 x = cps + tp->t_ififosize; 2288 clist_alloc_cblocks(&tp->t_rawq, x, x); 2289 2290 /* Output. */ 2291 switch (tp->t_ospeedwat) { 2292 case (speed_t)-1: 2293 cps = tp->t_ospeed / 10; 2294 ttmaxhiwat = 2 * TTMAXHIWAT; 2295 break; 2296 case 0: 2297 cps = tp->t_ospeed / 10; 2298 ttmaxhiwat = TTMAXHIWAT; 2299 break; 2300 default: 2301 cps = tp->t_ospeedwat / 10; 2302 ttmaxhiwat = 8 * TTMAXHIWAT; 2303 break; 2304 } 2305 #define CLAMP(x, h, l) ((x) > h ? h : ((x) < l) ? l : (x)) 2306 tp->t_olowat = x = CLAMP(cps / 2, TTMAXLOWAT, TTMINLOWAT); 2307 x += cps; 2308 x = CLAMP(x, ttmaxhiwat, TTMINHIWAT); /* XXX clamps are too magic */ 2309 tp->t_ohiwat = roundup(x, CBSIZE); /* XXX for compat */ 2310 x = imax(tp->t_ohiwat, TTMAXHIWAT); /* XXX for compat/safety */ 2311 x += OBUFSIZ + 100; 2312 clist_alloc_cblocks(&tp->t_outq, x, x); 2313 #undef CLAMP 2314 } 2315 2316 /* 2317 * Report on state of foreground process group. 2318 */ 2319 void 2320 ttyinfo(struct tty *tp) 2321 { 2322 struct proc *p, *pick; 2323 struct lwp *lp; 2324 struct rusage ru; 2325 int tmp; 2326 2327 if (ttycheckoutq(tp,0) == 0) 2328 return; 2329 2330 /* 2331 * We always print the load average, then figure out what else to 2332 * print based on the state of the current process group. 2333 */ 2334 tmp = (averunnable.ldavg[0] * 100 + FSCALE / 2) >> FSHIFT; 2335 ttyprintf(tp, "load: %d.%02d ", tmp / 100, tmp % 100); 2336 2337 if (tp->t_session == NULL) { 2338 ttyprintf(tp, "not a controlling terminal\n"); 2339 } else if (tp->t_pgrp == NULL) { 2340 ttyprintf(tp, "no foreground process group\n"); 2341 } else if ((p = LIST_FIRST(&tp->t_pgrp->pg_members)) == 0) { 2342 ttyprintf(tp, "empty foreground process group\n"); 2343 } else { 2344 /* 2345 * Pick an interesting process. Note that certain elements, 2346 * in particular the wmesg, require a critical section for 2347 * safe access (YYY and we are still not MP safe). 2348 * 2349 * NOTE: lwp_wmesg is lwp_thread->td_wmesg. 2350 */ 2351 char buf[64]; 2352 const char *str; 2353 long vmsz; 2354 int pctcpu; 2355 2356 crit_enter(); 2357 2358 /* XXX lwp should compare lwps */ 2359 2360 for (pick = NULL; p != 0; p = LIST_NEXT(p, p_pglist)) { 2361 if (proc_compare(pick, p)) 2362 pick = p; 2363 } 2364 2365 /* XXX lwp */ 2366 lp = FIRST_LWP_IN_PROC(pick); 2367 if (lp == NULL) { 2368 ttyprintf(tp, "foreground process without lwp\n"); 2369 tp->t_rocount = 0; 2370 crit_exit(); 2371 return; 2372 } 2373 2374 /* 2375 * Figure out what wait/process-state message, and command 2376 * buffer to present 2377 */ 2378 /* 2379 * XXX lwp This is a horrible mixture. We need to rework this 2380 * as soon as lwps have their own runnable status. 2381 */ 2382 if (pick->p_flag & P_WEXIT) 2383 str = "exiting"; 2384 else if (lp->lwp_stat == LSRUN) 2385 str = "running"; 2386 else if (pick->p_stat == SIDL) 2387 str = "spawning"; 2388 else if (lp->lwp_wmesg) /* lwp_thread must not be NULL */ 2389 str = lp->lwp_wmesg; 2390 else 2391 str = "iowait"; 2392 2393 ksnprintf(buf, sizeof(buf), "cmd: %s %d [%s]", 2394 pick->p_comm, pick->p_pid, str); 2395 2396 /* 2397 * Calculate cpu usage, percent cpu, and cmsz. Note that 2398 * 'pick' becomes invalid the moment we exit the critical 2399 * section. 2400 */ 2401 if (lp->lwp_thread && (pick->p_flag & P_SWAPPEDOUT) == 0) 2402 calcru_proc(pick, &ru); 2403 2404 pctcpu = (lp->lwp_pctcpu * 10000 + FSCALE / 2) >> FSHIFT; 2405 2406 if (pick->p_stat == SIDL || pick->p_stat == SZOMB) 2407 vmsz = 0; 2408 else 2409 vmsz = pgtok(vmspace_resident_count(pick->p_vmspace)); 2410 2411 crit_exit(); 2412 2413 /* 2414 * Dump the output 2415 */ 2416 ttyprintf(tp, " %s ", buf); 2417 ttyprintf(tp, "%ld.%02ldu ", 2418 ru.ru_utime.tv_sec, ru.ru_utime.tv_usec / 10000); 2419 ttyprintf(tp, "%ld.%02lds ", 2420 ru.ru_stime.tv_sec, ru.ru_stime.tv_usec / 10000); 2421 ttyprintf(tp, "%d%% %ldk\n", pctcpu / 100, vmsz); 2422 } 2423 tp->t_rocount = 0; /* so pending input will be retyped if BS */ 2424 } 2425 2426 /* 2427 * Returns 1 if p2 is "better" than p1 2428 * 2429 * The algorithm for picking the "interesting" process is thus: 2430 * 2431 * 1) Only foreground processes are eligible - implied. 2432 * 2) Runnable processes are favored over anything else. The runner 2433 * with the highest cpu utilization is picked (p_cpticks). Ties are 2434 * broken by picking the highest pid. 2435 * 3) The sleeper with the shortest sleep time is next. With ties, 2436 * we pick out just "short-term" sleepers (LWP_SINTR == 0). 2437 * 4) Further ties are broken by picking the highest pid. 2438 */ 2439 #define ISRUN(lp) ((lp)->lwp_stat == LSRUN) 2440 #define TESTAB(a, b) ((a)<<1 | (b)) 2441 #define ONLYA 2 2442 #define ONLYB 1 2443 #define BOTH 3 2444 2445 static int 2446 proc_compare(struct proc *p1, struct proc *p2) 2447 { 2448 struct lwp *lp1, *lp2; 2449 if (p1 == NULL) 2450 return (1); 2451 2452 /* 2453 * weed out zombies 2454 */ 2455 switch (TESTAB(p1->p_stat == SZOMB, p2->p_stat == SZOMB)) { 2456 case ONLYA: 2457 return (1); 2458 case ONLYB: 2459 return (0); 2460 case BOTH: 2461 return (p2->p_pid > p1->p_pid); /* tie - return highest pid */ 2462 } 2463 2464 /* XXX lwp */ 2465 lp1 = FIRST_LWP_IN_PROC(p1); 2466 lp2 = FIRST_LWP_IN_PROC(p2); 2467 2468 /* 2469 * see if at least one of them is runnable 2470 */ 2471 switch (TESTAB(ISRUN(lp1), ISRUN(lp2))) { 2472 case ONLYA: 2473 return (0); 2474 case ONLYB: 2475 return (1); 2476 case BOTH: 2477 /* 2478 * tie - favor one with highest recent cpu utilization 2479 */ 2480 if (lp2->lwp_cpticks > lp1->lwp_cpticks) 2481 return (1); 2482 if (lp1->lwp_cpticks > lp2->lwp_cpticks) 2483 return (0); 2484 return (p2->p_pid > p1->p_pid); /* tie - return highest pid */ 2485 } 2486 /* 2487 * pick the one with the smallest sleep time 2488 */ 2489 if (lp2->lwp_slptime > lp1->lwp_slptime) 2490 return (0); 2491 if (lp1->lwp_slptime > lp2->lwp_slptime) 2492 return (1); 2493 /* 2494 * favor one sleeping in a non-interruptible sleep 2495 */ 2496 if (lp1->lwp_flag & LWP_SINTR && (lp2->lwp_flag & LWP_SINTR) == 0) 2497 return (1); 2498 if (lp2->lwp_flag & LWP_SINTR && (lp1->lwp_flag & LWP_SINTR) == 0) 2499 return (0); 2500 return (p2->p_pid > p1->p_pid); /* tie - return highest pid */ 2501 } 2502 2503 /* 2504 * Output char to tty; console putchar style. 2505 */ 2506 int 2507 tputchar(int c, struct tty *tp) 2508 { 2509 crit_enter(); 2510 if (!ISSET(tp->t_state, TS_CONNECTED)) { 2511 crit_exit(); 2512 return (-1); 2513 } 2514 if (c == '\n') 2515 (void)ttyoutput('\r', tp); 2516 (void)ttyoutput(c, tp); 2517 ttstart(tp); 2518 crit_exit(); 2519 return (0); 2520 } 2521 2522 /* 2523 * Sleep on chan, returning ERESTART if tty changed while we napped and 2524 * returning any errors (e.g. EINTR/EWOULDBLOCK) reported by tsleep. If 2525 * the tty is revoked, restarting a pending call will redo validation done 2526 * at the start of the call. 2527 */ 2528 int 2529 ttysleep(struct tty *tp, void *chan, int slpflags, char *wmesg, int timo) 2530 { 2531 int error; 2532 int gen; 2533 2534 gen = tp->t_gen; 2535 error = tsleep(chan, slpflags, wmesg, timo); 2536 if (error) 2537 return (error); 2538 return (tp->t_gen == gen ? 0 : ERESTART); 2539 } 2540 2541 /* 2542 * Revoke a tty. 2543 * 2544 * We bump the gen to force any ttysleep()'s to return with ERESTART 2545 * and flush the tty. The related fp's should already have been 2546 * replaced so the tty will close when the last references on the 2547 * original fp's go away. 2548 */ 2549 int 2550 ttyrevoke(struct dev_revoke_args *ap) 2551 { 2552 struct tty *tp; 2553 2554 tp = ap->a_head.a_dev->si_tty; 2555 tp->t_gen++; 2556 ttyflush(tp, FREAD | FWRITE); 2557 wakeup(TSA_CARR_ON(tp)); 2558 ttwakeup(tp); 2559 ttwwakeup(tp); 2560 return (0); 2561 } 2562 2563 /* 2564 * Allocate a tty struct. Clists in the struct will be allocated by 2565 * ttyopen(). 2566 */ 2567 struct tty * 2568 ttymalloc(struct tty *tp) 2569 { 2570 2571 if (tp) { 2572 return(tp); 2573 } 2574 tp = kmalloc(sizeof *tp, M_TTYS, M_WAITOK|M_ZERO); 2575 ttyregister(tp); 2576 return (tp); 2577 } 2578 2579 void 2580 ttyunregister(struct tty *tp) 2581 { 2582 KKASSERT(ISSET(tp->t_state, TS_REGISTERED)); 2583 CLR(tp->t_state, TS_REGISTERED); 2584 TAILQ_REMOVE(&tty_list, tp, t_list); 2585 } 2586 2587 void 2588 ttyregister(struct tty *tp) 2589 { 2590 KKASSERT(!ISSET(tp->t_state, TS_REGISTERED)); 2591 SET(tp->t_state, TS_REGISTERED); 2592 TAILQ_INSERT_HEAD(&tty_list, tp, t_list); 2593 } 2594 2595 static int 2596 sysctl_kern_ttys(SYSCTL_HANDLER_ARGS) 2597 { 2598 int error; 2599 struct tty *tp; 2600 struct tty t; 2601 struct tty marker; 2602 2603 bzero(&marker, sizeof(marker)); 2604 marker.t_state = TS_MARKER; 2605 error = 0; 2606 2607 TAILQ_INSERT_HEAD(&tty_list, &marker, t_list); 2608 while ((tp = TAILQ_NEXT(&marker, t_list)) != NULL) { 2609 TAILQ_REMOVE(&tty_list, &marker, t_list); 2610 TAILQ_INSERT_AFTER(&tty_list, tp, &marker, t_list); 2611 if (tp->t_state & TS_MARKER) 2612 continue; 2613 t = *tp; 2614 if (t.t_dev) 2615 t.t_dev = (cdev_t)(uintptr_t)dev2udev(t.t_dev); 2616 error = SYSCTL_OUT(req, (caddr_t)&t, sizeof(t)); 2617 if (error) 2618 break; 2619 } 2620 TAILQ_REMOVE(&tty_list, &marker, t_list); 2621 return (error); 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(struct tty *tp, int rw) 2629 { 2630 2631 return; 2632 } 2633 2634 int 2635 ttyread(struct dev_read_args *ap) 2636 { 2637 struct tty *tp; 2638 2639 tp = ap->a_head.a_dev->si_tty; 2640 if (tp == NULL) 2641 return (ENODEV); 2642 return ((*linesw[tp->t_line].l_read)(tp, ap->a_uio, ap->a_ioflag)); 2643 } 2644 2645 int 2646 ttywrite(struct dev_write_args *ap) 2647 { 2648 struct tty *tp; 2649 2650 tp = ap->a_head.a_dev->si_tty; 2651 if (tp == NULL) 2652 return (ENODEV); 2653 return ((*linesw[tp->t_line].l_write)(tp, ap->a_uio, ap->a_ioflag)); 2654 } 2655