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 1.24 2006/06/13 08:12:03 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(dev, events, td) 1121 dev_t dev; 1122 int events; 1123 struct thread *td; 1124 { 1125 int revents = 0; 1126 struct tty *tp; 1127 1128 tp = dev->si_tty; 1129 if (tp == NULL) /* XXX used to return ENXIO, but that means true! */ 1130 return ((events & (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM)) 1131 | POLLHUP); 1132 1133 crit_enter(); 1134 if (events & (POLLIN | POLLRDNORM)) { 1135 if (ttnread(tp) > 0 || ISSET(tp->t_state, TS_ZOMBIE)) 1136 revents |= events & (POLLIN | POLLRDNORM); 1137 else 1138 selrecord(td, &tp->t_rsel); 1139 } 1140 if (events & (POLLOUT | POLLWRNORM)) { 1141 if ((tp->t_outq.c_cc <= tp->t_olowat && 1142 ISSET(tp->t_state, TS_CONNECTED)) 1143 || ISSET(tp->t_state, TS_ZOMBIE)) 1144 revents |= events & (POLLOUT | POLLWRNORM); 1145 else 1146 selrecord(td, &tp->t_wsel); 1147 } 1148 crit_exit(); 1149 return (revents); 1150 } 1151 1152 static struct filterops ttyread_filtops = 1153 { 1, NULL, filt_ttyrdetach, filt_ttyread }; 1154 static struct filterops ttywrite_filtops = 1155 { 1, NULL, filt_ttywdetach, filt_ttywrite }; 1156 1157 int 1158 ttykqfilter(dev, kn) 1159 dev_t dev; 1160 struct knote *kn; 1161 { 1162 struct tty *tp = dev->si_tty; 1163 struct klist *klist; 1164 1165 switch (kn->kn_filter) { 1166 case EVFILT_READ: 1167 klist = &tp->t_rsel.si_note; 1168 kn->kn_fop = &ttyread_filtops; 1169 break; 1170 case EVFILT_WRITE: 1171 klist = &tp->t_wsel.si_note; 1172 kn->kn_fop = &ttywrite_filtops; 1173 break; 1174 default: 1175 return (1); 1176 } 1177 1178 kn->kn_hook = (caddr_t)dev; 1179 1180 crit_enter(); 1181 SLIST_INSERT_HEAD(klist, kn, kn_selnext); 1182 crit_exit(); 1183 1184 return (0); 1185 } 1186 1187 static void 1188 filt_ttyrdetach(struct knote *kn) 1189 { 1190 struct tty *tp = ((dev_t)kn->kn_hook)->si_tty; 1191 1192 crit_enter(); 1193 SLIST_REMOVE(&tp->t_rsel.si_note, kn, knote, kn_selnext); 1194 crit_exit(); 1195 } 1196 1197 static int 1198 filt_ttyread(struct knote *kn, long hint) 1199 { 1200 struct tty *tp = ((dev_t)kn->kn_hook)->si_tty; 1201 1202 kn->kn_data = ttnread(tp); 1203 if (ISSET(tp->t_state, TS_ZOMBIE)) { 1204 kn->kn_flags |= EV_EOF; 1205 return (1); 1206 } 1207 return (kn->kn_data > 0); 1208 } 1209 1210 static void 1211 filt_ttywdetach(struct knote *kn) 1212 { 1213 struct tty *tp = ((dev_t)kn->kn_hook)->si_tty; 1214 1215 crit_enter(); 1216 SLIST_REMOVE(&tp->t_wsel.si_note, kn, knote, kn_selnext); 1217 crit_exit(); 1218 } 1219 1220 static int 1221 filt_ttywrite(kn, hint) 1222 struct knote *kn; 1223 long hint; 1224 { 1225 struct tty *tp = ((dev_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(tp) 1239 struct tty *tp; 1240 { 1241 int nread; 1242 1243 if (ISSET(tp->t_lflag, PENDIN)) 1244 ttypend(tp); 1245 nread = tp->t_canq.c_cc; 1246 if (!ISSET(tp->t_lflag, ICANON)) { 1247 nread += tp->t_rawq.c_cc; 1248 if (nread < tp->t_cc[VMIN] && tp->t_cc[VTIME] == 0) 1249 nread = 0; 1250 } 1251 return (nread); 1252 } 1253 1254 /* 1255 * Wait for output to drain. 1256 */ 1257 int 1258 ttywait(tp) 1259 struct tty *tp; 1260 { 1261 int error; 1262 1263 error = 0; 1264 crit_enter(); 1265 while ((tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY)) && 1266 ISSET(tp->t_state, TS_CONNECTED) && tp->t_oproc) { 1267 (*tp->t_oproc)(tp); 1268 if ((tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY)) && 1269 ISSET(tp->t_state, TS_CONNECTED)) { 1270 SET(tp->t_state, TS_SO_OCOMPLETE); 1271 error = ttysleep(tp, TSA_OCOMPLETE(tp), 1272 PCATCH, "ttywai", 1273 tp->t_timeout); 1274 if (error) { 1275 if (error == EWOULDBLOCK) 1276 error = EIO; 1277 break; 1278 } 1279 } else 1280 break; 1281 } 1282 if (!error && (tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY))) 1283 error = EIO; 1284 crit_exit(); 1285 return (error); 1286 } 1287 1288 /* 1289 * Flush if successfully wait. 1290 */ 1291 static int 1292 ttywflush(tp) 1293 struct tty *tp; 1294 { 1295 int error; 1296 1297 if ((error = ttywait(tp)) == 0) 1298 ttyflush(tp, FREAD); 1299 return (error); 1300 } 1301 1302 /* 1303 * Flush tty read and/or write queues, notifying anyone waiting. 1304 */ 1305 void 1306 ttyflush(tp, rw) 1307 struct tty *tp; 1308 int rw; 1309 { 1310 crit_enter(); 1311 #if 0 1312 again: 1313 #endif 1314 if (rw & FWRITE) { 1315 FLUSHQ(&tp->t_outq); 1316 CLR(tp->t_state, TS_TTSTOP); 1317 } 1318 (*tp->t_stop)(tp, rw); 1319 if (rw & FREAD) { 1320 FLUSHQ(&tp->t_canq); 1321 FLUSHQ(&tp->t_rawq); 1322 CLR(tp->t_lflag, PENDIN); 1323 tp->t_rocount = 0; 1324 tp->t_rocol = 0; 1325 CLR(tp->t_state, TS_LOCAL); 1326 ttwakeup(tp); 1327 if (ISSET(tp->t_state, TS_TBLOCK)) { 1328 if (rw & FWRITE) 1329 FLUSHQ(&tp->t_outq); 1330 ttyunblock(tp); 1331 1332 /* 1333 * Don't let leave any state that might clobber the 1334 * next line discipline (although we should do more 1335 * to send the START char). Not clearing the state 1336 * may have caused the "putc to a clist with no 1337 * reserved cblocks" panic/printf. 1338 */ 1339 CLR(tp->t_state, TS_TBLOCK); 1340 1341 #if 0 /* forget it, sleeping isn't always safe and we don't know when it is */ 1342 if (ISSET(tp->t_iflag, IXOFF)) { 1343 /* 1344 * XXX wait a bit in the hope that the stop 1345 * character (if any) will go out. Waiting 1346 * isn't good since it allows races. This 1347 * will be fixed when the stop character is 1348 * put in a special queue. Don't bother with 1349 * the checks in ttywait() since the timeout 1350 * will save us. 1351 */ 1352 SET(tp->t_state, TS_SO_OCOMPLETE); 1353 ttysleep(tp, TSA_OCOMPLETE(tp), 0, 1354 "ttyfls", hz / 10); 1355 /* 1356 * Don't try sending the stop character again. 1357 */ 1358 CLR(tp->t_state, TS_TBLOCK); 1359 goto again; 1360 } 1361 #endif 1362 } 1363 } 1364 if (rw & FWRITE) { 1365 FLUSHQ(&tp->t_outq); 1366 ttwwakeup(tp); 1367 } 1368 crit_exit(); 1369 } 1370 1371 /* 1372 * Copy in the default termios characters. 1373 */ 1374 void 1375 termioschars(t) 1376 struct termios *t; 1377 { 1378 1379 bcopy(ttydefchars, t->c_cc, sizeof t->c_cc); 1380 } 1381 1382 /* 1383 * Old interface. 1384 */ 1385 void 1386 ttychars(tp) 1387 struct tty *tp; 1388 { 1389 1390 termioschars(&tp->t_termios); 1391 } 1392 1393 /* 1394 * Handle input high water. Send stop character for the IXOFF case. Turn 1395 * on our input flow control bit and propagate the changes to the driver. 1396 * XXX the stop character should be put in a special high priority queue. 1397 */ 1398 void 1399 ttyblock(tp) 1400 struct tty *tp; 1401 { 1402 1403 SET(tp->t_state, TS_TBLOCK); 1404 if (ISSET(tp->t_iflag, IXOFF) && tp->t_cc[VSTOP] != _POSIX_VDISABLE && 1405 putc(tp->t_cc[VSTOP], &tp->t_outq) != 0) 1406 CLR(tp->t_state, TS_TBLOCK); /* try again later */ 1407 ttstart(tp); 1408 } 1409 1410 /* 1411 * Handle input low water. Send start character for the IXOFF case. Turn 1412 * off our input flow control bit and propagate the changes to the driver. 1413 * XXX the start character should be put in a special high priority queue. 1414 */ 1415 static void 1416 ttyunblock(tp) 1417 struct tty *tp; 1418 { 1419 1420 CLR(tp->t_state, TS_TBLOCK); 1421 if (ISSET(tp->t_iflag, IXOFF) && tp->t_cc[VSTART] != _POSIX_VDISABLE && 1422 putc(tp->t_cc[VSTART], &tp->t_outq) != 0) 1423 SET(tp->t_state, TS_TBLOCK); /* try again later */ 1424 ttstart(tp); 1425 } 1426 1427 #ifdef notyet 1428 /* Not used by any current (i386) drivers. */ 1429 /* 1430 * Restart after an inter-char delay. 1431 */ 1432 void 1433 ttrstrt(tp_arg) 1434 void *tp_arg; 1435 { 1436 struct tty *tp; 1437 1438 KASSERT(tp_arg != NULL, ("ttrstrt")); 1439 1440 tp = tp_arg; 1441 crit_enter(); 1442 CLR(tp->t_state, TS_TIMEOUT); 1443 ttstart(tp); 1444 crit_exit(); 1445 } 1446 #endif 1447 1448 int 1449 ttstart(tp) 1450 struct tty *tp; 1451 { 1452 1453 if (tp->t_oproc != NULL) /* XXX: Kludge for pty. */ 1454 (*tp->t_oproc)(tp); 1455 return (0); 1456 } 1457 1458 /* 1459 * "close" a line discipline 1460 */ 1461 int 1462 ttylclose(tp, flag) 1463 struct tty *tp; 1464 int flag; 1465 { 1466 1467 if (flag & FNONBLOCK || ttywflush(tp)) 1468 ttyflush(tp, FREAD | FWRITE); 1469 return (0); 1470 } 1471 1472 /* 1473 * Handle modem control transition on a tty. 1474 * Flag indicates new state of carrier. 1475 * Returns 0 if the line should be turned off, otherwise 1. 1476 */ 1477 int 1478 ttymodem(tp, flag) 1479 struct tty *tp; 1480 int flag; 1481 { 1482 1483 if (ISSET(tp->t_state, TS_CARR_ON) && ISSET(tp->t_cflag, MDMBUF)) { 1484 /* 1485 * MDMBUF: do flow control according to carrier flag 1486 * XXX TS_CAR_OFLOW doesn't do anything yet. TS_TTSTOP 1487 * works if IXON and IXANY are clear. 1488 */ 1489 if (flag) { 1490 CLR(tp->t_state, TS_CAR_OFLOW); 1491 CLR(tp->t_state, TS_TTSTOP); 1492 ttstart(tp); 1493 } else if (!ISSET(tp->t_state, TS_CAR_OFLOW)) { 1494 SET(tp->t_state, TS_CAR_OFLOW); 1495 SET(tp->t_state, TS_TTSTOP); 1496 (*tp->t_stop)(tp, 0); 1497 } 1498 } else if (flag == 0) { 1499 /* 1500 * Lost carrier. 1501 */ 1502 CLR(tp->t_state, TS_CARR_ON); 1503 if (ISSET(tp->t_state, TS_ISOPEN) && 1504 !ISSET(tp->t_cflag, CLOCAL)) { 1505 SET(tp->t_state, TS_ZOMBIE); 1506 CLR(tp->t_state, TS_CONNECTED); 1507 if (tp->t_session && tp->t_session->s_leader) 1508 psignal(tp->t_session->s_leader, SIGHUP); 1509 ttyflush(tp, FREAD | FWRITE); 1510 return (0); 1511 } 1512 } else { 1513 /* 1514 * Carrier now on. 1515 */ 1516 SET(tp->t_state, TS_CARR_ON); 1517 if (!ISSET(tp->t_state, TS_ZOMBIE)) 1518 SET(tp->t_state, TS_CONNECTED); 1519 wakeup(TSA_CARR_ON(tp)); 1520 ttwakeup(tp); 1521 ttwwakeup(tp); 1522 } 1523 return (1); 1524 } 1525 1526 /* 1527 * Reinput pending characters after state switch 1528 * call from a critical section. 1529 */ 1530 static void 1531 ttypend(tp) 1532 struct tty *tp; 1533 { 1534 struct clist tq; 1535 int c; 1536 1537 CLR(tp->t_lflag, PENDIN); 1538 SET(tp->t_state, TS_TYPEN); 1539 /* 1540 * XXX this assumes too much about clist internals. It may even 1541 * fail if the cblock slush pool is empty. We can't allocate more 1542 * cblocks here because we are called from an interrupt handler 1543 * and clist_alloc_cblocks() can wait. 1544 */ 1545 tq = tp->t_rawq; 1546 bzero(&tp->t_rawq, sizeof tp->t_rawq); 1547 tp->t_rawq.c_cbmax = tq.c_cbmax; 1548 tp->t_rawq.c_cbreserved = tq.c_cbreserved; 1549 while ((c = getc(&tq)) >= 0) 1550 ttyinput(c, tp); 1551 CLR(tp->t_state, TS_TYPEN); 1552 } 1553 1554 /* 1555 * Process a read call on a tty device. 1556 */ 1557 int 1558 ttread(tp, uio, flag) 1559 struct tty *tp; 1560 struct uio *uio; 1561 int flag; 1562 { 1563 struct clist *qp; 1564 int c; 1565 tcflag_t lflag; 1566 cc_t *cc = tp->t_cc; 1567 struct proc *pp; 1568 int first, error = 0; 1569 int has_stime = 0, last_cc = 0; 1570 long slp = 0; /* XXX this should be renamed `timo'. */ 1571 struct timeval stime; 1572 1573 loop: 1574 crit_enter(); 1575 lflag = tp->t_lflag; 1576 /* 1577 * take pending input first 1578 */ 1579 if (ISSET(lflag, PENDIN)) { 1580 ttypend(tp); 1581 splz(); /* reduce latency */ 1582 lflag = tp->t_lflag; /* XXX ttypend() clobbers it */ 1583 } 1584 1585 /* 1586 * Hang process if it's in the background. 1587 */ 1588 if ((pp = curproc) && isbackground(pp, tp)) { 1589 crit_exit(); 1590 if (SIGISMEMBER(pp->p_sigignore, SIGTTIN) || 1591 SIGISMEMBER(pp->p_sigmask, SIGTTIN) || 1592 (pp->p_flag & P_PPWAIT) || pp->p_pgrp->pg_jobc == 0) 1593 return (EIO); 1594 pgsignal(pp->p_pgrp, SIGTTIN, 1); 1595 error = ttysleep(tp, &lbolt, PCATCH, "ttybg2", 0); 1596 if (error) 1597 return (error); 1598 goto loop; 1599 } 1600 1601 if (ISSET(tp->t_state, TS_ZOMBIE)) { 1602 crit_exit(); 1603 return (0); /* EOF */ 1604 } 1605 1606 /* 1607 * If canonical, use the canonical queue, 1608 * else use the raw queue. 1609 * 1610 * (should get rid of clists...) 1611 */ 1612 qp = ISSET(lflag, ICANON) ? &tp->t_canq : &tp->t_rawq; 1613 1614 if (flag & IO_NDELAY) { 1615 if (qp->c_cc > 0) 1616 goto read; 1617 if (!ISSET(lflag, ICANON) && cc[VMIN] == 0) { 1618 crit_exit(); 1619 return (0); 1620 } 1621 crit_exit(); 1622 return (EWOULDBLOCK); 1623 } 1624 if (!ISSET(lflag, ICANON)) { 1625 int m = cc[VMIN]; 1626 long t = cc[VTIME]; 1627 struct timeval timecopy; 1628 1629 /* 1630 * Check each of the four combinations. 1631 * (m > 0 && t == 0) is the normal read case. 1632 * It should be fairly efficient, so we check that and its 1633 * companion case (m == 0 && t == 0) first. 1634 * For the other two cases, we compute the target sleep time 1635 * into slp. 1636 */ 1637 if (t == 0) { 1638 if (qp->c_cc < m) 1639 goto sleep; 1640 if (qp->c_cc > 0) 1641 goto read; 1642 1643 /* m, t and qp->c_cc are all 0. 0 is enough input. */ 1644 crit_exit(); 1645 return (0); 1646 } 1647 t *= 100000; /* time in us */ 1648 #define diff(t1, t2) (((t1).tv_sec - (t2).tv_sec) * 1000000 + \ 1649 ((t1).tv_usec - (t2).tv_usec)) 1650 if (m > 0) { 1651 if (qp->c_cc <= 0) 1652 goto sleep; 1653 if (qp->c_cc >= m) 1654 goto read; 1655 getmicrotime(&timecopy); 1656 if (!has_stime) { 1657 /* first character, start timer */ 1658 has_stime = 1; 1659 stime = timecopy; 1660 slp = t; 1661 } else if (qp->c_cc > last_cc) { 1662 /* got a character, restart timer */ 1663 stime = timecopy; 1664 slp = t; 1665 } else { 1666 /* nothing, check expiration */ 1667 slp = t - diff(timecopy, stime); 1668 if (slp <= 0) 1669 goto read; 1670 } 1671 last_cc = qp->c_cc; 1672 } else { /* m == 0 */ 1673 if (qp->c_cc > 0) 1674 goto read; 1675 getmicrotime(&timecopy); 1676 if (!has_stime) { 1677 has_stime = 1; 1678 stime = timecopy; 1679 slp = t; 1680 } else { 1681 slp = t - diff(timecopy, stime); 1682 if (slp <= 0) { 1683 /* Timed out, but 0 is enough input. */ 1684 crit_exit(); 1685 return (0); 1686 } 1687 } 1688 } 1689 #undef diff 1690 /* 1691 * Rounding down may make us wake up just short 1692 * of the target, so we round up. 1693 * The formula is ceiling(slp * hz/1000000). 1694 * 32-bit arithmetic is enough for hz < 169. 1695 * XXX see tvtohz() for how to avoid overflow if hz 1696 * is large (divide by `tick' and/or arrange to 1697 * use tvtohz() if hz is large). 1698 */ 1699 slp = (long) (((u_long)slp * hz) + 999999) / 1000000; 1700 goto sleep; 1701 } 1702 if (qp->c_cc <= 0) { 1703 sleep: 1704 /* 1705 * There is no input, or not enough input and we can block. 1706 */ 1707 error = ttysleep(tp, TSA_HUP_OR_INPUT(tp), PCATCH, 1708 ISSET(tp->t_state, TS_CONNECTED) ? 1709 "ttyin" : "ttyhup", (int)slp); 1710 crit_exit(); 1711 if (error == EWOULDBLOCK) 1712 error = 0; 1713 else if (error) 1714 return (error); 1715 /* 1716 * XXX what happens if another process eats some input 1717 * while we are asleep (not just here)? It would be 1718 * safest to detect changes and reset our state variables 1719 * (has_stime and last_cc). 1720 */ 1721 slp = 0; 1722 goto loop; 1723 } 1724 read: 1725 crit_exit(); 1726 /* 1727 * Input present, check for input mapping and processing. 1728 */ 1729 first = 1; 1730 if (ISSET(lflag, ICANON | ISIG)) 1731 goto slowcase; 1732 for (;;) { 1733 char ibuf[IBUFSIZ]; 1734 int icc; 1735 1736 icc = imin(uio->uio_resid, IBUFSIZ); 1737 icc = q_to_b(qp, ibuf, icc); 1738 if (icc <= 0) { 1739 if (first) 1740 goto loop; 1741 break; 1742 } 1743 error = uiomove(ibuf, icc, uio); 1744 /* 1745 * XXX if there was an error then we should ungetc() the 1746 * unmoved chars and reduce icc here. 1747 */ 1748 if (error) 1749 break; 1750 if (uio->uio_resid == 0) 1751 break; 1752 first = 0; 1753 } 1754 goto out; 1755 slowcase: 1756 for (;;) { 1757 c = getc(qp); 1758 if (c < 0) { 1759 if (first) 1760 goto loop; 1761 break; 1762 } 1763 /* 1764 * delayed suspend (^Y) 1765 */ 1766 if (CCEQ(cc[VDSUSP], c) && 1767 ISSET(lflag, IEXTEN | ISIG) == (IEXTEN | ISIG)) { 1768 pgsignal(tp->t_pgrp, SIGTSTP, 1); 1769 if (first) { 1770 error = ttysleep(tp, &lbolt, PCATCH, 1771 "ttybg3", 0); 1772 if (error) 1773 break; 1774 goto loop; 1775 } 1776 break; 1777 } 1778 /* 1779 * Interpret EOF only in canonical mode. 1780 */ 1781 if (CCEQ(cc[VEOF], c) && ISSET(lflag, ICANON)) 1782 break; 1783 /* 1784 * Give user character. 1785 */ 1786 error = ureadc(c, uio); 1787 if (error) 1788 /* XXX should ungetc(c, qp). */ 1789 break; 1790 if (uio->uio_resid == 0) 1791 break; 1792 /* 1793 * In canonical mode check for a "break character" 1794 * marking the end of a "line of input". 1795 */ 1796 if (ISSET(lflag, ICANON) && TTBREAKC(c, lflag)) 1797 break; 1798 first = 0; 1799 } 1800 1801 out: 1802 /* 1803 * Look to unblock input now that (presumably) 1804 * the input queue has gone down. 1805 */ 1806 crit_enter(); 1807 if (ISSET(tp->t_state, TS_TBLOCK) && 1808 tp->t_rawq.c_cc + tp->t_canq.c_cc <= tp->t_ilowat) 1809 ttyunblock(tp); 1810 crit_exit(); 1811 1812 return (error); 1813 } 1814 1815 /* 1816 * Check the output queue on tp for space for a kernel message (from uprintf 1817 * or tprintf). Allow some space over the normal hiwater mark so we don't 1818 * lose messages due to normal flow control, but don't let the tty run amok. 1819 * Sleeps here are not interruptible, but we return prematurely if new signals 1820 * arrive. 1821 */ 1822 int 1823 ttycheckoutq(tp, wait) 1824 struct tty *tp; 1825 int wait; 1826 { 1827 int hiwat; 1828 sigset_t oldmask; 1829 1830 hiwat = tp->t_ohiwat; 1831 SIGEMPTYSET(oldmask); 1832 crit_enter(); 1833 if (wait) 1834 oldmask = curproc->p_siglist; 1835 if (tp->t_outq.c_cc > hiwat + OBUFSIZ + 100) { 1836 while (tp->t_outq.c_cc > hiwat) { 1837 ttstart(tp); 1838 if (tp->t_outq.c_cc <= hiwat) 1839 break; 1840 if (!(wait && SIGSETEQ(curproc->p_siglist, oldmask))) { 1841 crit_exit(); 1842 return (0); 1843 } 1844 SET(tp->t_state, TS_SO_OLOWAT); 1845 tsleep(TSA_OLOWAT(tp), 0, "ttoutq", hz); 1846 } 1847 } 1848 crit_exit(); 1849 return (1); 1850 } 1851 1852 /* 1853 * Process a write call on a tty device. 1854 */ 1855 int 1856 ttwrite(tp, uio, flag) 1857 struct tty *tp; 1858 struct uio *uio; 1859 int flag; 1860 { 1861 char *cp = NULL; 1862 int cc, ce; 1863 struct proc *pp; 1864 int i, hiwat, cnt, error; 1865 char obuf[OBUFSIZ]; 1866 1867 hiwat = tp->t_ohiwat; 1868 cnt = uio->uio_resid; 1869 error = 0; 1870 cc = 0; 1871 loop: 1872 crit_enter(); 1873 if (ISSET(tp->t_state, TS_ZOMBIE)) { 1874 crit_exit(); 1875 if (uio->uio_resid == cnt) 1876 error = EIO; 1877 goto out; 1878 } 1879 if (!ISSET(tp->t_state, TS_CONNECTED)) { 1880 if (flag & IO_NDELAY) { 1881 crit_exit(); 1882 error = EWOULDBLOCK; 1883 goto out; 1884 } 1885 error = ttysleep(tp, TSA_CARR_ON(tp), PCATCH, "ttydcd", 0); 1886 crit_exit(); 1887 if (error) 1888 goto out; 1889 goto loop; 1890 } 1891 crit_exit(); 1892 1893 /* 1894 * Hang the process if it's in the background. 1895 */ 1896 if ((pp = curproc) && isbackground(pp, tp) && 1897 ISSET(tp->t_lflag, TOSTOP) && !(pp->p_flag & P_PPWAIT) && 1898 !SIGISMEMBER(pp->p_sigignore, SIGTTOU) && 1899 !SIGISMEMBER(pp->p_sigmask, SIGTTOU)) { 1900 if (pp->p_pgrp->pg_jobc == 0) { 1901 error = EIO; 1902 goto out; 1903 } 1904 pgsignal(pp->p_pgrp, SIGTTOU, 1); 1905 error = ttysleep(tp, &lbolt, PCATCH, "ttybg4", 0); 1906 if (error) 1907 goto out; 1908 goto loop; 1909 } 1910 /* 1911 * Process the user's data in at most OBUFSIZ chunks. Perform any 1912 * output translation. Keep track of high water mark, sleep on 1913 * overflow awaiting device aid in acquiring new space. 1914 */ 1915 while (uio->uio_resid > 0 || cc > 0) { 1916 if (ISSET(tp->t_lflag, FLUSHO)) { 1917 uio->uio_resid = 0; 1918 return (0); 1919 } 1920 if (tp->t_outq.c_cc > hiwat) 1921 goto ovhiwat; 1922 /* 1923 * Grab a hunk of data from the user, unless we have some 1924 * leftover from last time. 1925 */ 1926 if (cc == 0) { 1927 cc = imin(uio->uio_resid, OBUFSIZ); 1928 cp = obuf; 1929 error = uiomove(cp, cc, uio); 1930 if (error) { 1931 cc = 0; 1932 break; 1933 } 1934 } 1935 /* 1936 * If nothing fancy need be done, grab those characters we 1937 * can handle without any of ttyoutput's processing and 1938 * just transfer them to the output q. For those chars 1939 * which require special processing (as indicated by the 1940 * bits in char_type), call ttyoutput. After processing 1941 * a hunk of data, look for FLUSHO so ^O's will take effect 1942 * immediately. 1943 */ 1944 while (cc > 0) { 1945 if (!ISSET(tp->t_oflag, OPOST)) 1946 ce = cc; 1947 else { 1948 ce = cc - scanc((u_int)cc, (u_char *)cp, 1949 char_type, CCLASSMASK); 1950 /* 1951 * If ce is zero, then we're processing 1952 * a special character through ttyoutput. 1953 */ 1954 if (ce == 0) { 1955 tp->t_rocount = 0; 1956 if (ttyoutput(*cp, tp) >= 0) { 1957 /* No Clists, wait a bit. */ 1958 ttstart(tp); 1959 if (flag & IO_NDELAY) { 1960 error = EWOULDBLOCK; 1961 goto out; 1962 } 1963 error = ttysleep(tp, &lbolt, 1964 PCATCH, 1965 "ttybf1", 0); 1966 if (error) 1967 goto out; 1968 goto loop; 1969 } 1970 cp++; 1971 cc--; 1972 if (ISSET(tp->t_lflag, FLUSHO) || 1973 tp->t_outq.c_cc > hiwat) 1974 goto ovhiwat; 1975 continue; 1976 } 1977 } 1978 /* 1979 * A bunch of normal characters have been found. 1980 * Transfer them en masse to the output queue and 1981 * continue processing at the top of the loop. 1982 * If there are any further characters in this 1983 * <= OBUFSIZ chunk, the first should be a character 1984 * requiring special handling by ttyoutput. 1985 */ 1986 tp->t_rocount = 0; 1987 i = b_to_q(cp, ce, &tp->t_outq); 1988 ce -= i; 1989 tp->t_column += ce; 1990 cp += ce, cc -= ce, tk_nout += ce; 1991 tp->t_outcc += ce; 1992 if (i > 0) { 1993 /* No Clists, wait a bit. */ 1994 ttstart(tp); 1995 if (flag & IO_NDELAY) { 1996 error = EWOULDBLOCK; 1997 goto out; 1998 } 1999 error = ttysleep(tp, &lbolt, PCATCH, 2000 "ttybf2", 0); 2001 if (error) 2002 goto out; 2003 goto loop; 2004 } 2005 if (ISSET(tp->t_lflag, FLUSHO) || 2006 tp->t_outq.c_cc > hiwat) 2007 break; 2008 } 2009 ttstart(tp); 2010 } 2011 out: 2012 /* 2013 * If cc is nonzero, we leave the uio structure inconsistent, as the 2014 * offset and iov pointers have moved forward, but it doesn't matter 2015 * (the call will either return short or restart with a new uio). 2016 */ 2017 uio->uio_resid += cc; 2018 return (error); 2019 2020 ovhiwat: 2021 ttstart(tp); 2022 crit_enter(); 2023 /* 2024 * This can only occur if FLUSHO is set in t_lflag, 2025 * or if ttstart/oproc is synchronous (or very fast). 2026 */ 2027 if (tp->t_outq.c_cc <= hiwat) { 2028 crit_exit(); 2029 goto loop; 2030 } 2031 if (flag & IO_NDELAY) { 2032 crit_exit(); 2033 uio->uio_resid += cc; 2034 return (uio->uio_resid == cnt ? EWOULDBLOCK : 0); 2035 } 2036 SET(tp->t_state, TS_SO_OLOWAT); 2037 error = ttysleep(tp, TSA_OLOWAT(tp), PCATCH, "ttywri", tp->t_timeout); 2038 crit_exit(); 2039 if (error == EWOULDBLOCK) 2040 error = EIO; 2041 if (error) 2042 goto out; 2043 goto loop; 2044 } 2045 2046 /* 2047 * Rubout one character from the rawq of tp 2048 * as cleanly as possible. 2049 */ 2050 static void 2051 ttyrub(c, tp) 2052 int c; 2053 struct tty *tp; 2054 { 2055 char *cp; 2056 int savecol; 2057 int tabc; 2058 2059 if (!ISSET(tp->t_lflag, ECHO) || ISSET(tp->t_lflag, EXTPROC)) 2060 return; 2061 CLR(tp->t_lflag, FLUSHO); 2062 if (ISSET(tp->t_lflag, ECHOE)) { 2063 if (tp->t_rocount == 0) { 2064 /* 2065 * Screwed by ttwrite; retype 2066 */ 2067 ttyretype(tp); 2068 return; 2069 } 2070 if (c == ('\t' | TTY_QUOTE) || c == ('\n' | TTY_QUOTE)) 2071 ttyrubo(tp, 2); 2072 else { 2073 CLR(c, ~TTY_CHARMASK); 2074 switch (CCLASS(c)) { 2075 case ORDINARY: 2076 ttyrubo(tp, 1); 2077 break; 2078 case BACKSPACE: 2079 case CONTROL: 2080 case NEWLINE: 2081 case RETURN: 2082 case VTAB: 2083 if (ISSET(tp->t_lflag, ECHOCTL)) 2084 ttyrubo(tp, 2); 2085 break; 2086 case TAB: 2087 if (tp->t_rocount < tp->t_rawq.c_cc) { 2088 ttyretype(tp); 2089 return; 2090 } 2091 crit_enter(); 2092 savecol = tp->t_column; 2093 SET(tp->t_state, TS_CNTTB); 2094 SET(tp->t_lflag, FLUSHO); 2095 tp->t_column = tp->t_rocol; 2096 cp = tp->t_rawq.c_cf; 2097 if (cp) 2098 tabc = *cp; /* XXX FIX NEXTC */ 2099 for (; cp; cp = nextc(&tp->t_rawq, cp, &tabc)) 2100 ttyecho(tabc, tp); 2101 CLR(tp->t_lflag, FLUSHO); 2102 CLR(tp->t_state, TS_CNTTB); 2103 crit_exit(); 2104 2105 /* savecol will now be length of the tab. */ 2106 savecol -= tp->t_column; 2107 tp->t_column += savecol; 2108 if (savecol > 8) 2109 savecol = 8; /* overflow screw */ 2110 while (--savecol >= 0) 2111 (void)ttyoutput('\b', tp); 2112 break; 2113 default: /* XXX */ 2114 #define PANICSTR "ttyrub: would panic c = %d, val = %d\n" 2115 (void)printf(PANICSTR, c, CCLASS(c)); 2116 #ifdef notdef 2117 panic(PANICSTR, c, CCLASS(c)); 2118 #endif 2119 } 2120 } 2121 } else if (ISSET(tp->t_lflag, ECHOPRT)) { 2122 if (!ISSET(tp->t_state, TS_ERASE)) { 2123 SET(tp->t_state, TS_ERASE); 2124 (void)ttyoutput('\\', tp); 2125 } 2126 ttyecho(c, tp); 2127 } else { 2128 ttyecho(tp->t_cc[VERASE], tp); 2129 /* 2130 * This code may be executed not only when an ERASE key 2131 * is pressed, but also when ^U (KILL) or ^W (WERASE) are. 2132 * So, I didn't think it was worthwhile to pass the extra 2133 * information (which would need an extra parameter, 2134 * changing every call) needed to distinguish the ERASE2 2135 * case from the ERASE. 2136 */ 2137 } 2138 --tp->t_rocount; 2139 } 2140 2141 /* 2142 * Back over cnt characters, erasing them. 2143 */ 2144 static void 2145 ttyrubo(tp, cnt) 2146 struct tty *tp; 2147 int cnt; 2148 { 2149 2150 while (cnt-- > 0) { 2151 (void)ttyoutput('\b', tp); 2152 (void)ttyoutput(' ', tp); 2153 (void)ttyoutput('\b', tp); 2154 } 2155 } 2156 2157 /* 2158 * ttyretype -- 2159 * Reprint the rawq line. Note, it is assumed that c_cc has already 2160 * been checked. 2161 */ 2162 static void 2163 ttyretype(tp) 2164 struct tty *tp; 2165 { 2166 char *cp; 2167 int c; 2168 2169 /* Echo the reprint character. */ 2170 if (tp->t_cc[VREPRINT] != _POSIX_VDISABLE) 2171 ttyecho(tp->t_cc[VREPRINT], tp); 2172 2173 (void)ttyoutput('\n', tp); 2174 2175 /* 2176 * XXX 2177 * FIX: NEXTC IS BROKEN - DOESN'T CHECK QUOTE 2178 * BIT OF FIRST CHAR. 2179 */ 2180 crit_enter(); 2181 for (cp = tp->t_canq.c_cf, c = (cp != NULL ? *cp : 0); 2182 cp != NULL; cp = nextc(&tp->t_canq, cp, &c)) 2183 ttyecho(c, tp); 2184 for (cp = tp->t_rawq.c_cf, c = (cp != NULL ? *cp : 0); 2185 cp != NULL; cp = nextc(&tp->t_rawq, cp, &c)) 2186 ttyecho(c, tp); 2187 CLR(tp->t_state, TS_ERASE); 2188 crit_exit(); 2189 2190 tp->t_rocount = tp->t_rawq.c_cc; 2191 tp->t_rocol = 0; 2192 } 2193 2194 /* 2195 * Echo a typed character to the terminal. 2196 */ 2197 static void 2198 ttyecho(c, tp) 2199 int c; 2200 struct tty *tp; 2201 { 2202 2203 if (!ISSET(tp->t_state, TS_CNTTB)) 2204 CLR(tp->t_lflag, FLUSHO); 2205 if ((!ISSET(tp->t_lflag, ECHO) && 2206 (c != '\n' || !ISSET(tp->t_lflag, ECHONL))) || 2207 ISSET(tp->t_lflag, EXTPROC)) 2208 return; 2209 if (ISSET(tp->t_lflag, ECHOCTL) && 2210 ((ISSET(c, TTY_CHARMASK) <= 037 && c != '\t' && c != '\n') || 2211 ISSET(c, TTY_CHARMASK) == 0177)) { 2212 (void)ttyoutput('^', tp); 2213 CLR(c, ~TTY_CHARMASK); 2214 if (c == 0177) 2215 c = '?'; 2216 else 2217 c += 'A' - 1; 2218 } 2219 (void)ttyoutput(c, tp); 2220 } 2221 2222 /* 2223 * Wake up any readers on a tty. 2224 */ 2225 void 2226 ttwakeup(tp) 2227 struct tty *tp; 2228 { 2229 2230 if (tp->t_rsel.si_pid != 0) 2231 selwakeup(&tp->t_rsel); 2232 if (ISSET(tp->t_state, TS_ASYNC) && tp->t_sigio != NULL) 2233 pgsigio(tp->t_sigio, SIGIO, (tp->t_session != NULL)); 2234 wakeup(TSA_HUP_OR_INPUT(tp)); 2235 KNOTE(&tp->t_rsel.si_note, 0); 2236 } 2237 2238 /* 2239 * Wake up any writers on a tty. 2240 */ 2241 void 2242 ttwwakeup(tp) 2243 struct tty *tp; 2244 { 2245 2246 if (tp->t_wsel.si_pid != 0 && tp->t_outq.c_cc <= tp->t_olowat) 2247 selwakeup(&tp->t_wsel); 2248 if (ISSET(tp->t_state, TS_ASYNC) && tp->t_sigio != NULL) 2249 pgsigio(tp->t_sigio, SIGIO, (tp->t_session != NULL)); 2250 if (ISSET(tp->t_state, TS_BUSY | TS_SO_OCOMPLETE) == 2251 TS_SO_OCOMPLETE && tp->t_outq.c_cc == 0) { 2252 CLR(tp->t_state, TS_SO_OCOMPLETE); 2253 wakeup(TSA_OCOMPLETE(tp)); 2254 } 2255 if (ISSET(tp->t_state, TS_SO_OLOWAT) && 2256 tp->t_outq.c_cc <= tp->t_olowat) { 2257 CLR(tp->t_state, TS_SO_OLOWAT); 2258 wakeup(TSA_OLOWAT(tp)); 2259 } 2260 KNOTE(&tp->t_wsel.si_note, 0); 2261 } 2262 2263 /* 2264 * Look up a code for a specified speed in a conversion table; 2265 * used by drivers to map software speed values to hardware parameters. 2266 */ 2267 int 2268 ttspeedtab(speed, table) 2269 int speed; 2270 struct speedtab *table; 2271 { 2272 2273 for ( ; table->sp_speed != -1; table++) 2274 if (table->sp_speed == speed) 2275 return (table->sp_code); 2276 return (-1); 2277 } 2278 2279 /* 2280 * Set input and output watermarks and buffer sizes. For input, the 2281 * high watermark is about one second's worth of input above empty, the 2282 * low watermark is slightly below high water, and the buffer size is a 2283 * driver-dependent amount above high water. For output, the watermarks 2284 * are near the ends of the buffer, with about 1 second's worth of input 2285 * between them. All this only applies to the standard line discipline. 2286 */ 2287 void 2288 ttsetwater(tp) 2289 struct tty *tp; 2290 { 2291 int cps, ttmaxhiwat, x; 2292 2293 /* Input. */ 2294 clist_alloc_cblocks(&tp->t_canq, TTYHOG, 512); 2295 switch (tp->t_ispeedwat) { 2296 case (speed_t)-1: 2297 cps = tp->t_ispeed / 10; 2298 break; 2299 case 0: 2300 /* 2301 * This case is for old drivers that don't know about 2302 * t_ispeedwat. Arrange for them to get the old buffer 2303 * sizes and watermarks. 2304 */ 2305 cps = TTYHOG - 2 * 256; 2306 tp->t_ififosize = 2 * 256; 2307 break; 2308 default: 2309 cps = tp->t_ispeedwat / 10; 2310 break; 2311 } 2312 tp->t_ihiwat = cps; 2313 tp->t_ilowat = 7 * cps / 8; 2314 x = cps + tp->t_ififosize; 2315 clist_alloc_cblocks(&tp->t_rawq, x, x); 2316 2317 /* Output. */ 2318 switch (tp->t_ospeedwat) { 2319 case (speed_t)-1: 2320 cps = tp->t_ospeed / 10; 2321 ttmaxhiwat = 2 * TTMAXHIWAT; 2322 break; 2323 case 0: 2324 cps = tp->t_ospeed / 10; 2325 ttmaxhiwat = TTMAXHIWAT; 2326 break; 2327 default: 2328 cps = tp->t_ospeedwat / 10; 2329 ttmaxhiwat = 8 * TTMAXHIWAT; 2330 break; 2331 } 2332 #define CLAMP(x, h, l) ((x) > h ? h : ((x) < l) ? l : (x)) 2333 tp->t_olowat = x = CLAMP(cps / 2, TTMAXLOWAT, TTMINLOWAT); 2334 x += cps; 2335 x = CLAMP(x, ttmaxhiwat, TTMINHIWAT); /* XXX clamps are too magic */ 2336 tp->t_ohiwat = roundup(x, CBSIZE); /* XXX for compat */ 2337 x = imax(tp->t_ohiwat, TTMAXHIWAT); /* XXX for compat/safety */ 2338 x += OBUFSIZ + 100; 2339 clist_alloc_cblocks(&tp->t_outq, x, x); 2340 #undef CLAMP 2341 } 2342 2343 /* 2344 * Report on state of foreground process group. 2345 */ 2346 void 2347 ttyinfo(tp) 2348 struct tty *tp; 2349 { 2350 struct proc *p, *pick; 2351 struct timeval utime, stime; 2352 int tmp; 2353 2354 if (ttycheckoutq(tp,0) == 0) 2355 return; 2356 2357 /* 2358 * We always print the load average, then figure out what else to 2359 * print based on the state of the current process group. 2360 */ 2361 tmp = (averunnable.ldavg[0] * 100 + FSCALE / 2) >> FSHIFT; 2362 ttyprintf(tp, "load: %d.%02d ", tmp / 100, tmp % 100); 2363 2364 if (tp->t_session == NULL) { 2365 ttyprintf(tp, "not a controlling terminal\n"); 2366 } else if (tp->t_pgrp == NULL) { 2367 ttyprintf(tp, "no foreground process group\n"); 2368 } else if ((p = LIST_FIRST(&tp->t_pgrp->pg_members)) == 0) { 2369 ttyprintf(tp, "empty foreground process group\n"); 2370 } else { 2371 /* 2372 * Pick an interesting process. Note that certain elements, 2373 * in particular the wmesg, require a critical section for 2374 * safe access (YYY and we are still not MP safe). 2375 * 2376 * NOTE: p_wmesg is p_thread->td_wmesg, and p_comm is 2377 * p_thread->td_comm. 2378 */ 2379 char buf[64]; 2380 const char *str; 2381 int isinmem; 2382 long vmsz; 2383 int pctcpu; 2384 2385 crit_enter(); 2386 2387 for (pick = NULL; p != 0; p = LIST_NEXT(p, p_pglist)) { 2388 if (proc_compare(pick, p)) 2389 pick = p; 2390 } 2391 2392 /* 2393 * Figure out what wait/process-state message, and command 2394 * buffer to present 2395 */ 2396 if (pick->p_thread == NULL) 2397 str = "exiting"; 2398 else if (pick->p_stat == SRUN) 2399 str = "running"; 2400 else if (pick->p_wmesg) /* p_thread must not be NULL */ 2401 str = pick->p_wmesg; 2402 else 2403 str = "iowait"; 2404 2405 snprintf(buf, sizeof(buf), "cmd: %s %d [%s]", 2406 (pick->p_thread ? pick->p_comm : "?"), 2407 pick->p_pid, str); 2408 2409 /* 2410 * Calculate cpu usage, percent cpu, and cmsz. Note that 2411 * 'pick' becomes invalid the moment we exit the critical 2412 * section. 2413 */ 2414 if (pick->p_thread && (pick->p_flag & P_SWAPPEDOUT) == 0) { 2415 calcru(pick, &utime, &stime, NULL); 2416 isinmem = 1; 2417 } else { 2418 isinmem = 0; 2419 } 2420 2421 pctcpu = (pick->p_pctcpu * 10000 + FSCALE / 2) >> FSHIFT; 2422 2423 if (pick->p_stat == SIDL || (pick->p_flag & P_ZOMBIE)) 2424 vmsz = 0; 2425 else 2426 vmsz = pgtok(vmspace_resident_count(pick->p_vmspace)); 2427 2428 crit_exit(); 2429 2430 /* 2431 * Dump the output 2432 */ 2433 ttyprintf(tp, " %s ", buf); 2434 if (isinmem) { 2435 ttyprintf(tp, "%ld.%02ldu ", 2436 utime.tv_sec, utime.tv_usec / 10000); 2437 ttyprintf(tp, "%ld.%02lds ", 2438 stime.tv_sec, stime.tv_usec / 10000); 2439 } else { 2440 ttyprintf(tp, "?.??u ?.??s "); 2441 } 2442 ttyprintf(tp, "%d%% %ldk\n", pctcpu / 100, vmsz); 2443 } 2444 tp->t_rocount = 0; /* so pending input will be retyped if BS */ 2445 } 2446 2447 /* 2448 * Returns 1 if p2 is "better" than p1 2449 * 2450 * The algorithm for picking the "interesting" process is thus: 2451 * 2452 * 1) Only foreground processes are eligible - implied. 2453 * 2) Runnable processes are favored over anything else. The runner 2454 * with the highest cpu utilization is picked (p_cpticks). Ties are 2455 * broken by picking the highest pid. 2456 * 3) The sleeper with the shortest sleep time is next. With ties, 2457 * we pick out just "short-term" sleepers (P_SINTR == 0). 2458 * 4) Further ties are broken by picking the highest pid. 2459 */ 2460 #define ISRUN(p) (((p)->p_stat == SRUN) || ((p)->p_stat == SIDL)) 2461 #define TESTAB(a, b) ((a)<<1 | (b)) 2462 #define ONLYA 2 2463 #define ONLYB 1 2464 #define BOTH 3 2465 2466 static int 2467 proc_compare(p1, p2) 2468 struct proc *p1, *p2; 2469 { 2470 2471 if (p1 == NULL) 2472 return (1); 2473 /* 2474 * see if at least one of them is runnable 2475 */ 2476 switch (TESTAB(ISRUN(p1), ISRUN(p2))) { 2477 case ONLYA: 2478 return (0); 2479 case ONLYB: 2480 return (1); 2481 case BOTH: 2482 /* 2483 * tie - favor one with highest recent cpu utilization 2484 */ 2485 if (p2->p_cpticks > p1->p_cpticks) 2486 return (1); 2487 if (p1->p_cpticks > p2->p_cpticks) 2488 return (0); 2489 return (p2->p_pid > p1->p_pid); /* tie - return highest pid */ 2490 } 2491 /* 2492 * weed out zombies 2493 */ 2494 switch (TESTAB((p1->p_flag & P_ZOMBIE), (p2->p_flag & P_ZOMBIE))) { 2495 case ONLYA: 2496 return (1); 2497 case ONLYB: 2498 return (0); 2499 case BOTH: 2500 return (p2->p_pid > p1->p_pid); /* tie - return highest pid */ 2501 } 2502 /* 2503 * pick the one with the smallest sleep time 2504 */ 2505 if (p2->p_slptime > p1->p_slptime) 2506 return (0); 2507 if (p1->p_slptime > p2->p_slptime) 2508 return (1); 2509 /* 2510 * favor one sleeping in a non-interruptible sleep 2511 */ 2512 if (p1->p_flag & P_SINTR && (p2->p_flag & P_SINTR) == 0) 2513 return (1); 2514 if (p2->p_flag & P_SINTR && (p1->p_flag & P_SINTR) == 0) 2515 return (0); 2516 return (p2->p_pid > p1->p_pid); /* tie - return highest pid */ 2517 } 2518 2519 /* 2520 * Output char to tty; console putchar style. 2521 */ 2522 int 2523 tputchar(c, tp) 2524 int c; 2525 struct tty *tp; 2526 { 2527 crit_enter(); 2528 if (!ISSET(tp->t_state, TS_CONNECTED)) { 2529 crit_exit(); 2530 return (-1); 2531 } 2532 if (c == '\n') 2533 (void)ttyoutput('\r', tp); 2534 (void)ttyoutput(c, tp); 2535 ttstart(tp); 2536 crit_exit(); 2537 return (0); 2538 } 2539 2540 /* 2541 * Sleep on chan, returning ERESTART if tty changed while we napped and 2542 * returning any errors (e.g. EINTR/EWOULDBLOCK) reported by tsleep. If 2543 * the tty is revoked, restarting a pending call will redo validation done 2544 * at the start of the call. 2545 */ 2546 int 2547 ttysleep(tp, chan, slpflags, wmesg, timo) 2548 struct tty *tp; 2549 void *chan; 2550 int slpflags, timo; 2551 char *wmesg; 2552 { 2553 int error; 2554 int gen; 2555 2556 gen = tp->t_gen; 2557 error = tsleep(chan, slpflags, wmesg, timo); 2558 if (error) 2559 return (error); 2560 return (tp->t_gen == gen ? 0 : ERESTART); 2561 } 2562 2563 /* 2564 * Allocate a tty struct. Clists in the struct will be allocated by 2565 * ttyopen(). 2566 */ 2567 struct tty * 2568 ttymalloc(tp) 2569 struct tty *tp; 2570 { 2571 2572 if (tp) 2573 return(tp); 2574 tp = malloc(sizeof *tp, M_TTYS, M_WAITOK|M_ZERO); 2575 ttyregister(tp); 2576 return (tp); 2577 } 2578 2579 #if 0 2580 /* 2581 * Free a tty struct. Clists in the struct should have been freed by 2582 * ttyclose(). 2583 * 2584 * XXX not yet usable: since we support a half-closed state and do not 2585 * ref count the tty reference from the session, it is possible for a 2586 * session to hold a ref on the tty. See TTY_DO_FULL_CLOSE. 2587 */ 2588 void 2589 ttyfree(tp) 2590 struct tty *tp; 2591 { 2592 free(tp, M_TTYS); 2593 } 2594 #endif /* 0 */ 2595 2596 void 2597 ttyregister(tp) 2598 struct tty *tp; 2599 { 2600 SLIST_INSERT_HEAD(&tty_list, tp, t_list); 2601 } 2602 2603 static int 2604 sysctl_kern_ttys(SYSCTL_HANDLER_ARGS) 2605 { 2606 int error; 2607 struct tty *tp, t; 2608 SLIST_FOREACH(tp, &tty_list, t_list) { 2609 t = *tp; 2610 if (t.t_dev) 2611 t.t_dev = (dev_t)dev2udev(t.t_dev); 2612 error = SYSCTL_OUT(req, (caddr_t)&t, sizeof(t)); 2613 if (error) 2614 return (error); 2615 } 2616 return (0); 2617 } 2618 2619 SYSCTL_PROC(_kern, OID_AUTO, ttys, CTLTYPE_OPAQUE|CTLFLAG_RD, 2620 0, 0, sysctl_kern_ttys, "S,tty", "All struct ttys"); 2621 2622 void 2623 nottystop(tp, rw) 2624 struct tty *tp; 2625 int rw; 2626 { 2627 2628 return; 2629 } 2630 2631 int 2632 ttyread(dev, uio, flag) 2633 dev_t dev; 2634 struct uio *uio; 2635 int flag; 2636 { 2637 struct tty *tp; 2638 2639 tp = dev->si_tty; 2640 if (tp == NULL) 2641 return (ENODEV); 2642 return ((*linesw[tp->t_line].l_read)(tp, uio, flag)); 2643 } 2644 2645 int 2646 ttywrite(dev, uio, flag) 2647 dev_t dev; 2648 struct uio *uio; 2649 int flag; 2650 { 2651 struct tty *tp; 2652 2653 tp = dev->si_tty; 2654 if (tp == NULL) 2655 return (ENODEV); 2656 return ((*linesw[tp->t_line].l_write)(tp, uio, flag)); 2657 } 2658