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 1.18 2005/06/27 18:37:57 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. 299 */ 300 void 301 ttyclosesession(struct session *sp, int dorele) 302 { 303 struct vnode *vp; 304 struct thread *td = curthread; 305 306 if ((vp = sp->s_ttyvp) == NULL) 307 return; 308 sp->s_ttyvp = NULL; 309 if (vp->v_flag & VCTTYISOPEN) { 310 if (vn_lock(vp, LK_EXCLUSIVE|LK_RETRY, td) == 0) { 311 vclrflags(vp, VCTTYISOPEN); 312 VOP_CLOSE(vp, 0, td); 313 VOP_UNLOCK(vp, 0, td); 314 } 315 } 316 if (dorele) 317 vrele(vp); 318 } 319 320 321 #define FLUSHQ(q) { \ 322 if ((q)->c_cc) \ 323 ndflush(q, (q)->c_cc); \ 324 } 325 326 /* Is 'c' a line delimiter ("break" character)? */ 327 #define TTBREAKC(c, lflag) \ 328 ((c) == '\n' || (((c) == cc[VEOF] || \ 329 (c) == cc[VEOL] || ((c) == cc[VEOL2] && lflag & IEXTEN)) && \ 330 (c) != _POSIX_VDISABLE)) 331 332 /* 333 * Process input of a single character received on a tty. 334 */ 335 int 336 ttyinput(c, tp) 337 int c; 338 struct tty *tp; 339 { 340 tcflag_t iflag, lflag; 341 cc_t *cc; 342 int i, err; 343 344 /* 345 * If input is pending take it first. 346 */ 347 lflag = tp->t_lflag; 348 if (ISSET(lflag, PENDIN)) 349 ttypend(tp); 350 /* 351 * Gather stats. 352 */ 353 if (ISSET(lflag, ICANON)) 354 ++tp->t_cancc; 355 else 356 ++tp->t_rawcc; 357 ++tk_nin; 358 359 /* 360 * Block further input iff: 361 * current input > threshold AND input is available to user program 362 * AND input flow control is enabled and not yet invoked. 363 * The 3 is slop for PARMRK. 364 */ 365 iflag = tp->t_iflag; 366 if (tp->t_rawq.c_cc + tp->t_canq.c_cc > tp->t_ihiwat - 3 && 367 (!ISSET(lflag, ICANON) || tp->t_canq.c_cc != 0) && 368 (ISSET(tp->t_cflag, CRTS_IFLOW) || ISSET(iflag, IXOFF)) && 369 !ISSET(tp->t_state, TS_TBLOCK)) 370 ttyblock(tp); 371 372 /* Handle exceptional conditions (break, parity, framing). */ 373 cc = tp->t_cc; 374 err = (ISSET(c, TTY_ERRORMASK)); 375 if (err) { 376 CLR(c, TTY_ERRORMASK); 377 if (ISSET(err, TTY_BI)) { 378 if (ISSET(iflag, IGNBRK)) 379 return (0); 380 if (ISSET(iflag, BRKINT)) { 381 ttyflush(tp, FREAD | FWRITE); 382 pgsignal(tp->t_pgrp, SIGINT, 1); 383 goto endcase; 384 } 385 if (ISSET(iflag, PARMRK)) 386 goto parmrk; 387 } else if ((ISSET(err, TTY_PE) && ISSET(iflag, INPCK)) 388 || ISSET(err, TTY_FE)) { 389 if (ISSET(iflag, IGNPAR)) 390 return (0); 391 else if (ISSET(iflag, PARMRK)) { 392 parmrk: 393 if (tp->t_rawq.c_cc + tp->t_canq.c_cc > 394 MAX_INPUT - 3) 395 goto input_overflow; 396 (void)putc(0377 | TTY_QUOTE, &tp->t_rawq); 397 (void)putc(0 | TTY_QUOTE, &tp->t_rawq); 398 (void)putc(c | TTY_QUOTE, &tp->t_rawq); 399 goto endcase; 400 } else 401 c = 0; 402 } 403 } 404 405 if (!ISSET(tp->t_state, TS_TYPEN) && ISSET(iflag, ISTRIP)) 406 CLR(c, 0x80); 407 if (!ISSET(lflag, EXTPROC)) { 408 /* 409 * Check for literal nexting very first 410 */ 411 if (ISSET(tp->t_state, TS_LNCH)) { 412 SET(c, TTY_QUOTE); 413 CLR(tp->t_state, TS_LNCH); 414 } 415 /* 416 * Scan for special characters. This code 417 * is really just a big case statement with 418 * non-constant cases. The bottom of the 419 * case statement is labeled ``endcase'', so goto 420 * it after a case match, or similar. 421 */ 422 423 /* 424 * Control chars which aren't controlled 425 * by ICANON, ISIG, or IXON. 426 */ 427 if (ISSET(lflag, IEXTEN)) { 428 if (CCEQ(cc[VLNEXT], c)) { 429 if (ISSET(lflag, ECHO)) { 430 if (ISSET(lflag, ECHOE)) { 431 (void)ttyoutput('^', tp); 432 (void)ttyoutput('\b', tp); 433 } else 434 ttyecho(c, tp); 435 } 436 SET(tp->t_state, TS_LNCH); 437 goto endcase; 438 } 439 if (CCEQ(cc[VDISCARD], c)) { 440 if (ISSET(lflag, FLUSHO)) 441 CLR(tp->t_lflag, FLUSHO); 442 else { 443 ttyflush(tp, FWRITE); 444 ttyecho(c, tp); 445 if (tp->t_rawq.c_cc + tp->t_canq.c_cc) 446 ttyretype(tp); 447 SET(tp->t_lflag, FLUSHO); 448 } 449 goto startoutput; 450 } 451 } 452 /* 453 * Signals. 454 */ 455 if (ISSET(lflag, ISIG)) { 456 if (CCEQ(cc[VINTR], c) || CCEQ(cc[VQUIT], c)) { 457 if (!ISSET(lflag, NOFLSH)) 458 ttyflush(tp, FREAD | FWRITE); 459 ttyecho(c, tp); 460 pgsignal(tp->t_pgrp, 461 CCEQ(cc[VINTR], c) ? SIGINT : SIGQUIT, 1); 462 goto endcase; 463 } 464 if (CCEQ(cc[VSUSP], c)) { 465 if (!ISSET(lflag, NOFLSH)) 466 ttyflush(tp, FREAD); 467 ttyecho(c, tp); 468 pgsignal(tp->t_pgrp, SIGTSTP, 1); 469 goto endcase; 470 } 471 } 472 /* 473 * Handle start/stop characters. 474 */ 475 if (ISSET(iflag, IXON)) { 476 if (CCEQ(cc[VSTOP], c)) { 477 if (!ISSET(tp->t_state, TS_TTSTOP)) { 478 SET(tp->t_state, TS_TTSTOP); 479 (*tp->t_stop)(tp, 0); 480 return (0); 481 } 482 if (!CCEQ(cc[VSTART], c)) 483 return (0); 484 /* 485 * if VSTART == VSTOP then toggle 486 */ 487 goto endcase; 488 } 489 if (CCEQ(cc[VSTART], c)) 490 goto restartoutput; 491 } 492 /* 493 * IGNCR, ICRNL, & INLCR 494 */ 495 if (c == '\r') { 496 if (ISSET(iflag, IGNCR)) 497 return (0); 498 else if (ISSET(iflag, ICRNL)) 499 c = '\n'; 500 } else if (c == '\n' && ISSET(iflag, INLCR)) 501 c = '\r'; 502 } 503 if (!ISSET(tp->t_lflag, EXTPROC) && ISSET(lflag, ICANON)) { 504 /* 505 * From here on down canonical mode character 506 * processing takes place. 507 */ 508 /* 509 * erase or erase2 (^H / ^?) 510 */ 511 if (CCEQ(cc[VERASE], c) || CCEQ(cc[VERASE2], c) ) { 512 if (tp->t_rawq.c_cc) 513 ttyrub(unputc(&tp->t_rawq), tp); 514 goto endcase; 515 } 516 /* 517 * kill (^U) 518 */ 519 if (CCEQ(cc[VKILL], c)) { 520 if (ISSET(lflag, ECHOKE) && 521 tp->t_rawq.c_cc == tp->t_rocount && 522 !ISSET(lflag, ECHOPRT)) 523 while (tp->t_rawq.c_cc) 524 ttyrub(unputc(&tp->t_rawq), tp); 525 else { 526 ttyecho(c, tp); 527 if (ISSET(lflag, ECHOK) || 528 ISSET(lflag, ECHOKE)) 529 ttyecho('\n', tp); 530 FLUSHQ(&tp->t_rawq); 531 tp->t_rocount = 0; 532 } 533 CLR(tp->t_state, TS_LOCAL); 534 goto endcase; 535 } 536 /* 537 * word erase (^W) 538 */ 539 if (CCEQ(cc[VWERASE], c) && ISSET(lflag, IEXTEN)) { 540 int ctype; 541 542 /* 543 * erase whitespace 544 */ 545 while ((c = unputc(&tp->t_rawq)) == ' ' || c == '\t') 546 ttyrub(c, tp); 547 if (c == -1) 548 goto endcase; 549 /* 550 * erase last char of word and remember the 551 * next chars type (for ALTWERASE) 552 */ 553 ttyrub(c, tp); 554 c = unputc(&tp->t_rawq); 555 if (c == -1) 556 goto endcase; 557 if (c == ' ' || c == '\t') { 558 (void)putc(c, &tp->t_rawq); 559 goto endcase; 560 } 561 ctype = ISALPHA(c); 562 /* 563 * erase rest of word 564 */ 565 do { 566 ttyrub(c, tp); 567 c = unputc(&tp->t_rawq); 568 if (c == -1) 569 goto endcase; 570 } while (c != ' ' && c != '\t' && 571 (!ISSET(lflag, ALTWERASE) || ISALPHA(c) == ctype)); 572 (void)putc(c, &tp->t_rawq); 573 goto endcase; 574 } 575 /* 576 * reprint line (^R) 577 */ 578 if (CCEQ(cc[VREPRINT], c) && ISSET(lflag, IEXTEN)) { 579 ttyretype(tp); 580 goto endcase; 581 } 582 /* 583 * ^T - kernel info and generate SIGINFO 584 */ 585 if (CCEQ(cc[VSTATUS], c) && ISSET(lflag, IEXTEN)) { 586 if (ISSET(lflag, ISIG)) 587 pgsignal(tp->t_pgrp, SIGINFO, 1); 588 if (!ISSET(lflag, NOKERNINFO)) 589 ttyinfo(tp); 590 goto endcase; 591 } 592 if (CCEQ(cc[VCHECKPT], c) && ISSET(lflag, IEXTEN)) { 593 if (ISSET(lflag, ISIG)) 594 pgsignal(tp->t_pgrp, SIGCKPT, 1); 595 goto endcase; 596 } 597 } 598 /* 599 * Check for input buffer overflow 600 */ 601 if (tp->t_rawq.c_cc + tp->t_canq.c_cc >= MAX_INPUT) { 602 input_overflow: 603 if (ISSET(iflag, IMAXBEL)) { 604 if (tp->t_outq.c_cc < tp->t_ohiwat) 605 (void)ttyoutput(CTRL('g'), tp); 606 } 607 goto endcase; 608 } 609 610 if ( c == 0377 && ISSET(iflag, PARMRK) && !ISSET(iflag, ISTRIP) 611 && ISSET(iflag, IGNBRK|IGNPAR) != (IGNBRK|IGNPAR)) 612 (void)putc(0377 | TTY_QUOTE, &tp->t_rawq); 613 614 /* 615 * Put data char in q for user and 616 * wakeup on seeing a line delimiter. 617 */ 618 if (putc(c, &tp->t_rawq) >= 0) { 619 if (!ISSET(lflag, ICANON)) { 620 ttwakeup(tp); 621 ttyecho(c, tp); 622 goto endcase; 623 } 624 if (TTBREAKC(c, lflag)) { 625 tp->t_rocount = 0; 626 catq(&tp->t_rawq, &tp->t_canq); 627 ttwakeup(tp); 628 } else if (tp->t_rocount++ == 0) 629 tp->t_rocol = tp->t_column; 630 if (ISSET(tp->t_state, TS_ERASE)) { 631 /* 632 * end of prterase \.../ 633 */ 634 CLR(tp->t_state, TS_ERASE); 635 (void)ttyoutput('/', tp); 636 } 637 i = tp->t_column; 638 ttyecho(c, tp); 639 if (CCEQ(cc[VEOF], c) && ISSET(lflag, ECHO)) { 640 /* 641 * Place the cursor over the '^' of the ^D. 642 */ 643 i = imin(2, tp->t_column - i); 644 while (i > 0) { 645 (void)ttyoutput('\b', tp); 646 i--; 647 } 648 } 649 } 650 endcase: 651 /* 652 * IXANY means allow any character to restart output. 653 */ 654 if (ISSET(tp->t_state, TS_TTSTOP) && 655 !ISSET(iflag, IXANY) && cc[VSTART] != cc[VSTOP]) 656 return (0); 657 restartoutput: 658 CLR(tp->t_lflag, FLUSHO); 659 CLR(tp->t_state, TS_TTSTOP); 660 startoutput: 661 return (ttstart(tp)); 662 } 663 664 /* 665 * Output a single character on a tty, doing output processing 666 * as needed (expanding tabs, newline processing, etc.). 667 * Returns < 0 if succeeds, otherwise returns char to resend. 668 * Must be recursive. 669 */ 670 static int 671 ttyoutput(c, tp) 672 int c; 673 struct tty *tp; 674 { 675 tcflag_t oflag; 676 int col; 677 678 oflag = tp->t_oflag; 679 if (!ISSET(oflag, OPOST)) { 680 if (ISSET(tp->t_lflag, FLUSHO)) 681 return (-1); 682 if (putc(c, &tp->t_outq)) 683 return (c); 684 tk_nout++; 685 tp->t_outcc++; 686 return (-1); 687 } 688 /* 689 * Do tab expansion if OXTABS is set. Special case if we external 690 * processing, we don't do the tab expansion because we'll probably 691 * get it wrong. If tab expansion needs to be done, let it happen 692 * externally. 693 */ 694 CLR(c, ~TTY_CHARMASK); 695 if (c == '\t' && 696 ISSET(oflag, OXTABS) && !ISSET(tp->t_lflag, EXTPROC)) { 697 c = 8 - (tp->t_column & 7); 698 if (!ISSET(tp->t_lflag, FLUSHO)) { 699 crit_enter(); /* Don't interrupt tabs. */ 700 c -= b_to_q(" ", c, &tp->t_outq); 701 tk_nout += c; 702 tp->t_outcc += c; 703 crit_exit(); 704 } 705 tp->t_column += c; 706 return (c ? -1 : '\t'); 707 } 708 if (c == CEOT && ISSET(oflag, ONOEOT)) 709 return (-1); 710 711 /* 712 * Newline translation: if ONLCR is set, 713 * translate newline into "\r\n". 714 */ 715 if (c == '\n' && ISSET(tp->t_oflag, ONLCR)) { 716 tk_nout++; 717 tp->t_outcc++; 718 if (!ISSET(tp->t_lflag, FLUSHO) && putc('\r', &tp->t_outq)) 719 return (c); 720 } 721 /* If OCRNL is set, translate "\r" into "\n". */ 722 else if (c == '\r' && ISSET(tp->t_oflag, OCRNL)) 723 c = '\n'; 724 /* If ONOCR is set, don't transmit CRs when on column 0. */ 725 else if (c == '\r' && ISSET(tp->t_oflag, ONOCR) && tp->t_column == 0) 726 return (-1); 727 728 tk_nout++; 729 tp->t_outcc++; 730 if (!ISSET(tp->t_lflag, FLUSHO) && putc(c, &tp->t_outq)) 731 return (c); 732 733 col = tp->t_column; 734 switch (CCLASS(c)) { 735 case BACKSPACE: 736 if (col > 0) 737 --col; 738 break; 739 case CONTROL: 740 break; 741 case NEWLINE: 742 if (ISSET(tp->t_oflag, ONLCR | ONLRET)) 743 col = 0; 744 break; 745 case RETURN: 746 col = 0; 747 break; 748 case ORDINARY: 749 ++col; 750 break; 751 case TAB: 752 col = (col + 8) & ~7; 753 break; 754 } 755 tp->t_column = col; 756 return (-1); 757 } 758 759 /* 760 * Ioctls for all tty devices. Called after line-discipline specific ioctl 761 * has been called to do discipline-specific functions and/or reject any 762 * of these ioctl commands. 763 */ 764 /* ARGSUSED */ 765 int 766 ttioctl(struct tty *tp, u_long cmd, void *data, int flag) 767 { 768 struct thread *td = curthread; 769 struct proc *p = td->td_proc; 770 int error; 771 772 KKASSERT(p); 773 774 /* If the ioctl involves modification, hang if in the background. */ 775 switch (cmd) { 776 case TIOCCBRK: 777 case TIOCCONS: 778 case TIOCDRAIN: 779 case TIOCEXCL: 780 case TIOCFLUSH: 781 #ifdef TIOCHPCL 782 case TIOCHPCL: 783 #endif 784 case TIOCNXCL: 785 case TIOCSBRK: 786 case TIOCSCTTY: 787 case TIOCSDRAINWAIT: 788 case TIOCSETA: 789 case TIOCSETAF: 790 case TIOCSETAW: 791 case TIOCSETD: 792 case TIOCSPGRP: 793 case TIOCSTART: 794 case TIOCSTAT: 795 case TIOCSTI: 796 case TIOCSTOP: 797 case TIOCSWINSZ: 798 #if defined(COMPAT_43) || defined(COMPAT_SUNOS) 799 case TIOCLBIC: 800 case TIOCLBIS: 801 case TIOCLSET: 802 case TIOCSETC: 803 case OTIOCSETD: 804 case TIOCSETN: 805 case TIOCSETP: 806 case TIOCSLTC: 807 #endif 808 while (isbackground(p, tp) && !(p->p_flag & P_PPWAIT) && 809 !SIGISMEMBER(p->p_sigignore, SIGTTOU) && 810 !SIGISMEMBER(p->p_sigmask, SIGTTOU)) { 811 if (p->p_pgrp->pg_jobc == 0) 812 return (EIO); 813 pgsignal(p->p_pgrp, SIGTTOU, 1); 814 error = ttysleep(tp, &lbolt, PCATCH, "ttybg1", 815 0); 816 if (error) 817 return (error); 818 } 819 break; 820 } 821 822 switch (cmd) { /* Process the ioctl. */ 823 case FIOASYNC: /* set/clear async i/o */ 824 crit_enter(); 825 if (*(int *)data) 826 SET(tp->t_state, TS_ASYNC); 827 else 828 CLR(tp->t_state, TS_ASYNC); 829 crit_exit(); 830 break; 831 case FIONBIO: /* set/clear non-blocking i/o */ 832 break; /* XXX: delete. */ 833 case FIONREAD: /* get # bytes to read */ 834 crit_enter(); 835 *(int *)data = ttnread(tp); 836 crit_exit(); 837 break; 838 839 case FIOSETOWN: 840 /* 841 * Policy -- Don't allow FIOSETOWN on someone else's 842 * controlling tty 843 */ 844 if (tp->t_session != NULL && !isctty(p, tp)) 845 return (ENOTTY); 846 847 error = fsetown(*(int *)data, &tp->t_sigio); 848 if (error) 849 return (error); 850 break; 851 case FIOGETOWN: 852 if (tp->t_session != NULL && !isctty(p, tp)) 853 return (ENOTTY); 854 *(int *)data = fgetown(tp->t_sigio); 855 break; 856 857 case TIOCEXCL: /* set exclusive use of tty */ 858 crit_enter(); 859 SET(tp->t_state, TS_XCLUDE); 860 crit_exit(); 861 break; 862 case TIOCFLUSH: { /* flush buffers */ 863 int flags = *(int *)data; 864 865 if (flags == 0) 866 flags = FREAD | FWRITE; 867 else 868 flags &= FREAD | FWRITE; 869 ttyflush(tp, flags); 870 break; 871 } 872 case TIOCCONS: /* become virtual console */ 873 if (*(int *)data) { 874 if (constty && constty != tp && 875 ISSET(constty->t_state, TS_CONNECTED)) 876 return (EBUSY); 877 #ifndef UCONSOLE 878 if ((error = suser(td)) != 0) 879 return (error); 880 #endif 881 constty = tp; 882 } else if (tp == constty) 883 constty = NULL; 884 break; 885 case TIOCDRAIN: /* wait till output drained */ 886 error = ttywait(tp); 887 if (error) 888 return (error); 889 break; 890 case TIOCGETA: { /* get termios struct */ 891 struct termios *t = (struct termios *)data; 892 893 bcopy(&tp->t_termios, t, sizeof(struct termios)); 894 break; 895 } 896 case TIOCGETD: /* get line discipline */ 897 *(int *)data = tp->t_line; 898 break; 899 case TIOCGWINSZ: /* get window size */ 900 *(struct winsize *)data = tp->t_winsize; 901 break; 902 case TIOCGPGRP: /* get pgrp of tty */ 903 if (!isctty(p, tp)) 904 return (ENOTTY); 905 *(int *)data = tp->t_pgrp ? tp->t_pgrp->pg_id : NO_PID; 906 break; 907 #ifdef TIOCHPCL 908 case TIOCHPCL: /* hang up on last close */ 909 crit_enter(); 910 SET(tp->t_cflag, HUPCL); 911 crit_exit(); 912 break; 913 #endif 914 case TIOCNXCL: /* reset exclusive use of tty */ 915 crit_enter(); 916 CLR(tp->t_state, TS_XCLUDE); 917 crit_exit(); 918 break; 919 case TIOCOUTQ: /* output queue size */ 920 *(int *)data = tp->t_outq.c_cc; 921 break; 922 case TIOCSETA: /* set termios struct */ 923 case TIOCSETAW: /* drain output, set */ 924 case TIOCSETAF: { /* drn out, fls in, set */ 925 struct termios *t = (struct termios *)data; 926 927 if (t->c_ispeed == 0) 928 t->c_ispeed = t->c_ospeed; 929 if (t->c_ispeed == 0) 930 t->c_ispeed = tp->t_ospeed; 931 if (t->c_ispeed == 0) 932 return (EINVAL); 933 crit_enter(); 934 if (cmd == TIOCSETAW || cmd == TIOCSETAF) { 935 error = ttywait(tp); 936 if (error) { 937 crit_exit(); 938 return (error); 939 } 940 if (cmd == TIOCSETAF) 941 ttyflush(tp, FREAD); 942 } 943 if (!ISSET(t->c_cflag, CIGNORE)) { 944 /* 945 * Set device hardware. 946 */ 947 if (tp->t_param && (error = (*tp->t_param)(tp, t))) { 948 crit_exit(); 949 return (error); 950 } 951 if (ISSET(t->c_cflag, CLOCAL) && 952 !ISSET(tp->t_cflag, CLOCAL)) { 953 /* 954 * XXX disconnections would be too hard to 955 * get rid of without this kludge. The only 956 * way to get rid of controlling terminals 957 * is to exit from the session leader. 958 */ 959 CLR(tp->t_state, TS_ZOMBIE); 960 961 wakeup(TSA_CARR_ON(tp)); 962 ttwakeup(tp); 963 ttwwakeup(tp); 964 } 965 if ((ISSET(tp->t_state, TS_CARR_ON) || 966 ISSET(t->c_cflag, CLOCAL)) && 967 !ISSET(tp->t_state, TS_ZOMBIE)) 968 SET(tp->t_state, TS_CONNECTED); 969 else 970 CLR(tp->t_state, TS_CONNECTED); 971 tp->t_cflag = t->c_cflag; 972 tp->t_ispeed = t->c_ispeed; 973 if (t->c_ospeed != 0) 974 tp->t_ospeed = t->c_ospeed; 975 ttsetwater(tp); 976 } 977 if (ISSET(t->c_lflag, ICANON) != ISSET(tp->t_lflag, ICANON) && 978 cmd != TIOCSETAF) { 979 if (ISSET(t->c_lflag, ICANON)) 980 SET(tp->t_lflag, PENDIN); 981 else { 982 /* 983 * XXX we really shouldn't allow toggling 984 * ICANON while we're in a non-termios line 985 * discipline. Now we have to worry about 986 * panicing for a null queue. 987 */ 988 if (tp->t_canq.c_cbreserved > 0 && 989 tp->t_rawq.c_cbreserved > 0) { 990 catq(&tp->t_rawq, &tp->t_canq); 991 /* 992 * XXX the queue limits may be 993 * different, so the old queue 994 * swapping method no longer works. 995 */ 996 catq(&tp->t_canq, &tp->t_rawq); 997 } 998 CLR(tp->t_lflag, PENDIN); 999 } 1000 ttwakeup(tp); 1001 } 1002 tp->t_iflag = t->c_iflag; 1003 tp->t_oflag = t->c_oflag; 1004 /* 1005 * Make the EXTPROC bit read only. 1006 */ 1007 if (ISSET(tp->t_lflag, EXTPROC)) 1008 SET(t->c_lflag, EXTPROC); 1009 else 1010 CLR(t->c_lflag, EXTPROC); 1011 tp->t_lflag = t->c_lflag | ISSET(tp->t_lflag, PENDIN); 1012 if (t->c_cc[VMIN] != tp->t_cc[VMIN] || 1013 t->c_cc[VTIME] != tp->t_cc[VTIME]) 1014 ttwakeup(tp); 1015 bcopy(t->c_cc, tp->t_cc, sizeof(t->c_cc)); 1016 crit_exit(); 1017 break; 1018 } 1019 case TIOCSETD: { /* set line discipline */ 1020 int t = *(int *)data; 1021 dev_t device = tp->t_dev; 1022 1023 if ((u_int)t >= nlinesw) 1024 return (ENXIO); 1025 if (t != tp->t_line) { 1026 crit_enter(); 1027 (*linesw[tp->t_line].l_close)(tp, flag); 1028 error = (*linesw[t].l_open)(device, tp); 1029 if (error) { 1030 (void)(*linesw[tp->t_line].l_open)(device, tp); 1031 crit_exit(); 1032 return (error); 1033 } 1034 tp->t_line = t; 1035 crit_exit(); 1036 } 1037 break; 1038 } 1039 case TIOCSTART: /* start output, like ^Q */ 1040 crit_enter(); 1041 if (ISSET(tp->t_state, TS_TTSTOP) || 1042 ISSET(tp->t_lflag, FLUSHO)) { 1043 CLR(tp->t_lflag, FLUSHO); 1044 CLR(tp->t_state, TS_TTSTOP); 1045 ttstart(tp); 1046 } 1047 crit_exit(); 1048 break; 1049 case TIOCSTI: /* simulate terminal input */ 1050 if ((flag & FREAD) == 0 && suser(td)) 1051 return (EPERM); 1052 if (!isctty(p, tp) && suser(td)) 1053 return (EACCES); 1054 crit_enter(); 1055 (*linesw[tp->t_line].l_rint)(*(u_char *)data, tp); 1056 crit_exit(); 1057 break; 1058 case TIOCSTOP: /* stop output, like ^S */ 1059 crit_enter(); 1060 if (!ISSET(tp->t_state, TS_TTSTOP)) { 1061 SET(tp->t_state, TS_TTSTOP); 1062 (*tp->t_stop)(tp, 0); 1063 } 1064 crit_exit(); 1065 break; 1066 case TIOCSCTTY: /* become controlling tty */ 1067 /* Session ctty vnode pointer set in vnode layer. */ 1068 if (!SESS_LEADER(p) || 1069 ((p->p_session->s_ttyvp || tp->t_session) && 1070 (tp->t_session != p->p_session))) 1071 return (EPERM); 1072 tp->t_session = p->p_session; 1073 tp->t_pgrp = p->p_pgrp; 1074 p->p_session->s_ttyp = tp; 1075 p->p_flag |= P_CONTROLT; 1076 break; 1077 case TIOCSPGRP: { /* set pgrp of tty */ 1078 struct pgrp *pgrp = pgfind(*(int *)data); 1079 1080 if (!isctty(p, tp)) 1081 return (ENOTTY); 1082 else if (pgrp == NULL || pgrp->pg_session != p->p_session) 1083 return (EPERM); 1084 tp->t_pgrp = pgrp; 1085 break; 1086 } 1087 case TIOCSTAT: /* simulate control-T */ 1088 crit_enter(); 1089 ttyinfo(tp); 1090 crit_exit(); 1091 break; 1092 case TIOCSWINSZ: /* set window size */ 1093 if (bcmp((caddr_t)&tp->t_winsize, data, 1094 sizeof (struct winsize))) { 1095 tp->t_winsize = *(struct winsize *)data; 1096 pgsignal(tp->t_pgrp, SIGWINCH, 1); 1097 } 1098 break; 1099 case TIOCSDRAINWAIT: 1100 error = suser(td); 1101 if (error) 1102 return (error); 1103 tp->t_timeout = *(int *)data * hz; 1104 wakeup(TSA_OCOMPLETE(tp)); 1105 wakeup(TSA_OLOWAT(tp)); 1106 break; 1107 case TIOCGDRAINWAIT: 1108 *(int *)data = tp->t_timeout / hz; 1109 break; 1110 default: 1111 #if defined(COMPAT_43) || defined(COMPAT_SUNOS) 1112 return (ttcompat(tp, cmd, data, flag)); 1113 #else 1114 return (ENOIOCTL); 1115 #endif 1116 } 1117 return (0); 1118 } 1119 1120 int 1121 ttypoll(dev, events, td) 1122 dev_t dev; 1123 int events; 1124 struct thread *td; 1125 { 1126 int revents = 0; 1127 struct tty *tp; 1128 1129 tp = dev->si_tty; 1130 if (tp == NULL) /* XXX used to return ENXIO, but that means true! */ 1131 return ((events & (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM)) 1132 | POLLHUP); 1133 1134 crit_enter(); 1135 if (events & (POLLIN | POLLRDNORM)) { 1136 if (ttnread(tp) > 0 || ISSET(tp->t_state, TS_ZOMBIE)) 1137 revents |= events & (POLLIN | POLLRDNORM); 1138 else 1139 selrecord(td, &tp->t_rsel); 1140 } 1141 if (events & (POLLOUT | POLLWRNORM)) { 1142 if ((tp->t_outq.c_cc <= tp->t_olowat && 1143 ISSET(tp->t_state, TS_CONNECTED)) 1144 || ISSET(tp->t_state, TS_ZOMBIE)) 1145 revents |= events & (POLLOUT | POLLWRNORM); 1146 else 1147 selrecord(td, &tp->t_wsel); 1148 } 1149 crit_exit(); 1150 return (revents); 1151 } 1152 1153 static struct filterops ttyread_filtops = 1154 { 1, NULL, filt_ttyrdetach, filt_ttyread }; 1155 static struct filterops ttywrite_filtops = 1156 { 1, NULL, filt_ttywdetach, filt_ttywrite }; 1157 1158 int 1159 ttykqfilter(dev, kn) 1160 dev_t dev; 1161 struct knote *kn; 1162 { 1163 struct tty *tp = dev->si_tty; 1164 struct klist *klist; 1165 1166 switch (kn->kn_filter) { 1167 case EVFILT_READ: 1168 klist = &tp->t_rsel.si_note; 1169 kn->kn_fop = &ttyread_filtops; 1170 break; 1171 case EVFILT_WRITE: 1172 klist = &tp->t_wsel.si_note; 1173 kn->kn_fop = &ttywrite_filtops; 1174 break; 1175 default: 1176 return (1); 1177 } 1178 1179 kn->kn_hook = (caddr_t)dev; 1180 1181 crit_enter(); 1182 SLIST_INSERT_HEAD(klist, kn, kn_selnext); 1183 crit_exit(); 1184 1185 return (0); 1186 } 1187 1188 static void 1189 filt_ttyrdetach(struct knote *kn) 1190 { 1191 struct tty *tp = ((dev_t)kn->kn_hook)->si_tty; 1192 1193 crit_enter(); 1194 SLIST_REMOVE(&tp->t_rsel.si_note, kn, knote, kn_selnext); 1195 crit_exit(); 1196 } 1197 1198 static int 1199 filt_ttyread(struct knote *kn, long hint) 1200 { 1201 struct tty *tp = ((dev_t)kn->kn_hook)->si_tty; 1202 1203 kn->kn_data = ttnread(tp); 1204 if (ISSET(tp->t_state, TS_ZOMBIE)) { 1205 kn->kn_flags |= EV_EOF; 1206 return (1); 1207 } 1208 return (kn->kn_data > 0); 1209 } 1210 1211 static void 1212 filt_ttywdetach(struct knote *kn) 1213 { 1214 struct tty *tp = ((dev_t)kn->kn_hook)->si_tty; 1215 1216 crit_enter(); 1217 SLIST_REMOVE(&tp->t_wsel.si_note, kn, knote, kn_selnext); 1218 crit_exit(); 1219 } 1220 1221 static int 1222 filt_ttywrite(kn, hint) 1223 struct knote *kn; 1224 long hint; 1225 { 1226 struct tty *tp = ((dev_t)kn->kn_hook)->si_tty; 1227 1228 kn->kn_data = tp->t_outq.c_cc; 1229 if (ISSET(tp->t_state, TS_ZOMBIE)) 1230 return (1); 1231 return (kn->kn_data <= tp->t_olowat && 1232 ISSET(tp->t_state, TS_CONNECTED)); 1233 } 1234 1235 /* 1236 * Must be called while in a critical section. 1237 */ 1238 static int 1239 ttnread(tp) 1240 struct tty *tp; 1241 { 1242 int nread; 1243 1244 if (ISSET(tp->t_lflag, PENDIN)) 1245 ttypend(tp); 1246 nread = tp->t_canq.c_cc; 1247 if (!ISSET(tp->t_lflag, ICANON)) { 1248 nread += tp->t_rawq.c_cc; 1249 if (nread < tp->t_cc[VMIN] && tp->t_cc[VTIME] == 0) 1250 nread = 0; 1251 } 1252 return (nread); 1253 } 1254 1255 /* 1256 * Wait for output to drain. 1257 */ 1258 int 1259 ttywait(tp) 1260 struct tty *tp; 1261 { 1262 int error; 1263 1264 error = 0; 1265 crit_enter(); 1266 while ((tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY)) && 1267 ISSET(tp->t_state, TS_CONNECTED) && tp->t_oproc) { 1268 (*tp->t_oproc)(tp); 1269 if ((tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY)) && 1270 ISSET(tp->t_state, TS_CONNECTED)) { 1271 SET(tp->t_state, TS_SO_OCOMPLETE); 1272 error = ttysleep(tp, TSA_OCOMPLETE(tp), 1273 PCATCH, "ttywai", 1274 tp->t_timeout); 1275 if (error) { 1276 if (error == EWOULDBLOCK) 1277 error = EIO; 1278 break; 1279 } 1280 } else 1281 break; 1282 } 1283 if (!error && (tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY))) 1284 error = EIO; 1285 crit_exit(); 1286 return (error); 1287 } 1288 1289 /* 1290 * Flush if successfully wait. 1291 */ 1292 static int 1293 ttywflush(tp) 1294 struct tty *tp; 1295 { 1296 int error; 1297 1298 if ((error = ttywait(tp)) == 0) 1299 ttyflush(tp, FREAD); 1300 return (error); 1301 } 1302 1303 /* 1304 * Flush tty read and/or write queues, notifying anyone waiting. 1305 */ 1306 void 1307 ttyflush(tp, rw) 1308 struct tty *tp; 1309 int rw; 1310 { 1311 crit_enter(); 1312 #if 0 1313 again: 1314 #endif 1315 if (rw & FWRITE) { 1316 FLUSHQ(&tp->t_outq); 1317 CLR(tp->t_state, TS_TTSTOP); 1318 } 1319 (*tp->t_stop)(tp, rw); 1320 if (rw & FREAD) { 1321 FLUSHQ(&tp->t_canq); 1322 FLUSHQ(&tp->t_rawq); 1323 CLR(tp->t_lflag, PENDIN); 1324 tp->t_rocount = 0; 1325 tp->t_rocol = 0; 1326 CLR(tp->t_state, TS_LOCAL); 1327 ttwakeup(tp); 1328 if (ISSET(tp->t_state, TS_TBLOCK)) { 1329 if (rw & FWRITE) 1330 FLUSHQ(&tp->t_outq); 1331 ttyunblock(tp); 1332 1333 /* 1334 * Don't let leave any state that might clobber the 1335 * next line discipline (although we should do more 1336 * to send the START char). Not clearing the state 1337 * may have caused the "putc to a clist with no 1338 * reserved cblocks" panic/printf. 1339 */ 1340 CLR(tp->t_state, TS_TBLOCK); 1341 1342 #if 0 /* forget it, sleeping isn't always safe and we don't know when it is */ 1343 if (ISSET(tp->t_iflag, IXOFF)) { 1344 /* 1345 * XXX wait a bit in the hope that the stop 1346 * character (if any) will go out. Waiting 1347 * isn't good since it allows races. This 1348 * will be fixed when the stop character is 1349 * put in a special queue. Don't bother with 1350 * the checks in ttywait() since the timeout 1351 * will save us. 1352 */ 1353 SET(tp->t_state, TS_SO_OCOMPLETE); 1354 ttysleep(tp, TSA_OCOMPLETE(tp), 0, 1355 "ttyfls", hz / 10); 1356 /* 1357 * Don't try sending the stop character again. 1358 */ 1359 CLR(tp->t_state, TS_TBLOCK); 1360 goto again; 1361 } 1362 #endif 1363 } 1364 } 1365 if (rw & FWRITE) { 1366 FLUSHQ(&tp->t_outq); 1367 ttwwakeup(tp); 1368 } 1369 crit_exit(); 1370 } 1371 1372 /* 1373 * Copy in the default termios characters. 1374 */ 1375 void 1376 termioschars(t) 1377 struct termios *t; 1378 { 1379 1380 bcopy(ttydefchars, t->c_cc, sizeof t->c_cc); 1381 } 1382 1383 /* 1384 * Old interface. 1385 */ 1386 void 1387 ttychars(tp) 1388 struct tty *tp; 1389 { 1390 1391 termioschars(&tp->t_termios); 1392 } 1393 1394 /* 1395 * Handle input high water. Send stop character for the IXOFF case. Turn 1396 * on our input flow control bit and propagate the changes to the driver. 1397 * XXX the stop character should be put in a special high priority queue. 1398 */ 1399 void 1400 ttyblock(tp) 1401 struct tty *tp; 1402 { 1403 1404 SET(tp->t_state, TS_TBLOCK); 1405 if (ISSET(tp->t_iflag, IXOFF) && tp->t_cc[VSTOP] != _POSIX_VDISABLE && 1406 putc(tp->t_cc[VSTOP], &tp->t_outq) != 0) 1407 CLR(tp->t_state, TS_TBLOCK); /* try again later */ 1408 ttstart(tp); 1409 } 1410 1411 /* 1412 * Handle input low water. Send start character for the IXOFF case. Turn 1413 * off our input flow control bit and propagate the changes to the driver. 1414 * XXX the start character should be put in a special high priority queue. 1415 */ 1416 static void 1417 ttyunblock(tp) 1418 struct tty *tp; 1419 { 1420 1421 CLR(tp->t_state, TS_TBLOCK); 1422 if (ISSET(tp->t_iflag, IXOFF) && tp->t_cc[VSTART] != _POSIX_VDISABLE && 1423 putc(tp->t_cc[VSTART], &tp->t_outq) != 0) 1424 SET(tp->t_state, TS_TBLOCK); /* try again later */ 1425 ttstart(tp); 1426 } 1427 1428 #ifdef notyet 1429 /* Not used by any current (i386) drivers. */ 1430 /* 1431 * Restart after an inter-char delay. 1432 */ 1433 void 1434 ttrstrt(tp_arg) 1435 void *tp_arg; 1436 { 1437 struct tty *tp; 1438 1439 KASSERT(tp_arg != NULL, ("ttrstrt")); 1440 1441 tp = tp_arg; 1442 crit_enter(); 1443 CLR(tp->t_state, TS_TIMEOUT); 1444 ttstart(tp); 1445 crit_exit(); 1446 } 1447 #endif 1448 1449 int 1450 ttstart(tp) 1451 struct tty *tp; 1452 { 1453 1454 if (tp->t_oproc != NULL) /* XXX: Kludge for pty. */ 1455 (*tp->t_oproc)(tp); 1456 return (0); 1457 } 1458 1459 /* 1460 * "close" a line discipline 1461 */ 1462 int 1463 ttylclose(tp, flag) 1464 struct tty *tp; 1465 int flag; 1466 { 1467 1468 if (flag & FNONBLOCK || ttywflush(tp)) 1469 ttyflush(tp, FREAD | FWRITE); 1470 return (0); 1471 } 1472 1473 /* 1474 * Handle modem control transition on a tty. 1475 * Flag indicates new state of carrier. 1476 * Returns 0 if the line should be turned off, otherwise 1. 1477 */ 1478 int 1479 ttymodem(tp, flag) 1480 struct tty *tp; 1481 int flag; 1482 { 1483 1484 if (ISSET(tp->t_state, TS_CARR_ON) && ISSET(tp->t_cflag, MDMBUF)) { 1485 /* 1486 * MDMBUF: do flow control according to carrier flag 1487 * XXX TS_CAR_OFLOW doesn't do anything yet. TS_TTSTOP 1488 * works if IXON and IXANY are clear. 1489 */ 1490 if (flag) { 1491 CLR(tp->t_state, TS_CAR_OFLOW); 1492 CLR(tp->t_state, TS_TTSTOP); 1493 ttstart(tp); 1494 } else if (!ISSET(tp->t_state, TS_CAR_OFLOW)) { 1495 SET(tp->t_state, TS_CAR_OFLOW); 1496 SET(tp->t_state, TS_TTSTOP); 1497 (*tp->t_stop)(tp, 0); 1498 } 1499 } else if (flag == 0) { 1500 /* 1501 * Lost carrier. 1502 */ 1503 CLR(tp->t_state, TS_CARR_ON); 1504 if (ISSET(tp->t_state, TS_ISOPEN) && 1505 !ISSET(tp->t_cflag, CLOCAL)) { 1506 SET(tp->t_state, TS_ZOMBIE); 1507 CLR(tp->t_state, TS_CONNECTED); 1508 if (tp->t_session && tp->t_session->s_leader) 1509 psignal(tp->t_session->s_leader, SIGHUP); 1510 ttyflush(tp, FREAD | FWRITE); 1511 return (0); 1512 } 1513 } else { 1514 /* 1515 * Carrier now on. 1516 */ 1517 SET(tp->t_state, TS_CARR_ON); 1518 if (!ISSET(tp->t_state, TS_ZOMBIE)) 1519 SET(tp->t_state, TS_CONNECTED); 1520 wakeup(TSA_CARR_ON(tp)); 1521 ttwakeup(tp); 1522 ttwwakeup(tp); 1523 } 1524 return (1); 1525 } 1526 1527 /* 1528 * Reinput pending characters after state switch 1529 * call from a critical section. 1530 */ 1531 static void 1532 ttypend(tp) 1533 struct tty *tp; 1534 { 1535 struct clist tq; 1536 int c; 1537 1538 CLR(tp->t_lflag, PENDIN); 1539 SET(tp->t_state, TS_TYPEN); 1540 /* 1541 * XXX this assumes too much about clist internals. It may even 1542 * fail if the cblock slush pool is empty. We can't allocate more 1543 * cblocks here because we are called from an interrupt handler 1544 * and clist_alloc_cblocks() can wait. 1545 */ 1546 tq = tp->t_rawq; 1547 bzero(&tp->t_rawq, sizeof tp->t_rawq); 1548 tp->t_rawq.c_cbmax = tq.c_cbmax; 1549 tp->t_rawq.c_cbreserved = tq.c_cbreserved; 1550 while ((c = getc(&tq)) >= 0) 1551 ttyinput(c, tp); 1552 CLR(tp->t_state, TS_TYPEN); 1553 } 1554 1555 /* 1556 * Process a read call on a tty device. 1557 */ 1558 int 1559 ttread(tp, uio, flag) 1560 struct tty *tp; 1561 struct uio *uio; 1562 int flag; 1563 { 1564 struct clist *qp; 1565 int c; 1566 tcflag_t lflag; 1567 cc_t *cc = tp->t_cc; 1568 struct proc *pp; 1569 int first, error = 0; 1570 int has_stime = 0, last_cc = 0; 1571 long slp = 0; /* XXX this should be renamed `timo'. */ 1572 struct timeval stime; 1573 1574 loop: 1575 crit_enter(); 1576 lflag = tp->t_lflag; 1577 /* 1578 * take pending input first 1579 */ 1580 if (ISSET(lflag, PENDIN)) { 1581 ttypend(tp); 1582 splz(); /* reduce latency */ 1583 lflag = tp->t_lflag; /* XXX ttypend() clobbers it */ 1584 } 1585 1586 /* 1587 * Hang process if it's in the background. 1588 */ 1589 if ((pp = curproc) && isbackground(pp, tp)) { 1590 crit_exit(); 1591 if (SIGISMEMBER(pp->p_sigignore, SIGTTIN) || 1592 SIGISMEMBER(pp->p_sigmask, SIGTTIN) || 1593 (pp->p_flag & P_PPWAIT) || pp->p_pgrp->pg_jobc == 0) 1594 return (EIO); 1595 pgsignal(pp->p_pgrp, SIGTTIN, 1); 1596 error = ttysleep(tp, &lbolt, PCATCH, "ttybg2", 0); 1597 if (error) 1598 return (error); 1599 goto loop; 1600 } 1601 1602 if (ISSET(tp->t_state, TS_ZOMBIE)) { 1603 crit_exit(); 1604 return (0); /* EOF */ 1605 } 1606 1607 /* 1608 * If canonical, use the canonical queue, 1609 * else use the raw queue. 1610 * 1611 * (should get rid of clists...) 1612 */ 1613 qp = ISSET(lflag, ICANON) ? &tp->t_canq : &tp->t_rawq; 1614 1615 if (flag & IO_NDELAY) { 1616 if (qp->c_cc > 0) 1617 goto read; 1618 if (!ISSET(lflag, ICANON) && cc[VMIN] == 0) { 1619 crit_exit(); 1620 return (0); 1621 } 1622 crit_exit(); 1623 return (EWOULDBLOCK); 1624 } 1625 if (!ISSET(lflag, ICANON)) { 1626 int m = cc[VMIN]; 1627 long t = cc[VTIME]; 1628 struct timeval timecopy; 1629 1630 /* 1631 * Check each of the four combinations. 1632 * (m > 0 && t == 0) is the normal read case. 1633 * It should be fairly efficient, so we check that and its 1634 * companion case (m == 0 && t == 0) first. 1635 * For the other two cases, we compute the target sleep time 1636 * into slp. 1637 */ 1638 if (t == 0) { 1639 if (qp->c_cc < m) 1640 goto sleep; 1641 if (qp->c_cc > 0) 1642 goto read; 1643 1644 /* m, t and qp->c_cc are all 0. 0 is enough input. */ 1645 crit_exit(); 1646 return (0); 1647 } 1648 t *= 100000; /* time in us */ 1649 #define diff(t1, t2) (((t1).tv_sec - (t2).tv_sec) * 1000000 + \ 1650 ((t1).tv_usec - (t2).tv_usec)) 1651 if (m > 0) { 1652 if (qp->c_cc <= 0) 1653 goto sleep; 1654 if (qp->c_cc >= m) 1655 goto read; 1656 getmicrotime(&timecopy); 1657 if (!has_stime) { 1658 /* first character, start timer */ 1659 has_stime = 1; 1660 stime = timecopy; 1661 slp = t; 1662 } else if (qp->c_cc > last_cc) { 1663 /* got a character, restart timer */ 1664 stime = timecopy; 1665 slp = t; 1666 } else { 1667 /* nothing, check expiration */ 1668 slp = t - diff(timecopy, stime); 1669 if (slp <= 0) 1670 goto read; 1671 } 1672 last_cc = qp->c_cc; 1673 } else { /* m == 0 */ 1674 if (qp->c_cc > 0) 1675 goto read; 1676 getmicrotime(&timecopy); 1677 if (!has_stime) { 1678 has_stime = 1; 1679 stime = timecopy; 1680 slp = t; 1681 } else { 1682 slp = t - diff(timecopy, stime); 1683 if (slp <= 0) { 1684 /* Timed out, but 0 is enough input. */ 1685 crit_exit(); 1686 return (0); 1687 } 1688 } 1689 } 1690 #undef diff 1691 /* 1692 * Rounding down may make us wake up just short 1693 * of the target, so we round up. 1694 * The formula is ceiling(slp * hz/1000000). 1695 * 32-bit arithmetic is enough for hz < 169. 1696 * XXX see tvtohz() for how to avoid overflow if hz 1697 * is large (divide by `tick' and/or arrange to 1698 * use tvtohz() if hz is large). 1699 */ 1700 slp = (long) (((u_long)slp * hz) + 999999) / 1000000; 1701 goto sleep; 1702 } 1703 if (qp->c_cc <= 0) { 1704 sleep: 1705 /* 1706 * There is no input, or not enough input and we can block. 1707 */ 1708 error = ttysleep(tp, TSA_HUP_OR_INPUT(tp), PCATCH, 1709 ISSET(tp->t_state, TS_CONNECTED) ? 1710 "ttyin" : "ttyhup", (int)slp); 1711 crit_exit(); 1712 if (error == EWOULDBLOCK) 1713 error = 0; 1714 else if (error) 1715 return (error); 1716 /* 1717 * XXX what happens if another process eats some input 1718 * while we are asleep (not just here)? It would be 1719 * safest to detect changes and reset our state variables 1720 * (has_stime and last_cc). 1721 */ 1722 slp = 0; 1723 goto loop; 1724 } 1725 read: 1726 crit_exit(); 1727 /* 1728 * Input present, check for input mapping and processing. 1729 */ 1730 first = 1; 1731 if (ISSET(lflag, ICANON | ISIG)) 1732 goto slowcase; 1733 for (;;) { 1734 char ibuf[IBUFSIZ]; 1735 int icc; 1736 1737 icc = imin(uio->uio_resid, IBUFSIZ); 1738 icc = q_to_b(qp, ibuf, icc); 1739 if (icc <= 0) { 1740 if (first) 1741 goto loop; 1742 break; 1743 } 1744 error = uiomove(ibuf, icc, uio); 1745 /* 1746 * XXX if there was an error then we should ungetc() the 1747 * unmoved chars and reduce icc here. 1748 */ 1749 if (error) 1750 break; 1751 if (uio->uio_resid == 0) 1752 break; 1753 first = 0; 1754 } 1755 goto out; 1756 slowcase: 1757 for (;;) { 1758 c = getc(qp); 1759 if (c < 0) { 1760 if (first) 1761 goto loop; 1762 break; 1763 } 1764 /* 1765 * delayed suspend (^Y) 1766 */ 1767 if (CCEQ(cc[VDSUSP], c) && 1768 ISSET(lflag, IEXTEN | ISIG) == (IEXTEN | ISIG)) { 1769 pgsignal(tp->t_pgrp, SIGTSTP, 1); 1770 if (first) { 1771 error = ttysleep(tp, &lbolt, PCATCH, 1772 "ttybg3", 0); 1773 if (error) 1774 break; 1775 goto loop; 1776 } 1777 break; 1778 } 1779 /* 1780 * Interpret EOF only in canonical mode. 1781 */ 1782 if (CCEQ(cc[VEOF], c) && ISSET(lflag, ICANON)) 1783 break; 1784 /* 1785 * Give user character. 1786 */ 1787 error = ureadc(c, uio); 1788 if (error) 1789 /* XXX should ungetc(c, qp). */ 1790 break; 1791 if (uio->uio_resid == 0) 1792 break; 1793 /* 1794 * In canonical mode check for a "break character" 1795 * marking the end of a "line of input". 1796 */ 1797 if (ISSET(lflag, ICANON) && TTBREAKC(c, lflag)) 1798 break; 1799 first = 0; 1800 } 1801 1802 out: 1803 /* 1804 * Look to unblock input now that (presumably) 1805 * the input queue has gone down. 1806 */ 1807 crit_enter(); 1808 if (ISSET(tp->t_state, TS_TBLOCK) && 1809 tp->t_rawq.c_cc + tp->t_canq.c_cc <= tp->t_ilowat) 1810 ttyunblock(tp); 1811 crit_exit(); 1812 1813 return (error); 1814 } 1815 1816 /* 1817 * Check the output queue on tp for space for a kernel message (from uprintf 1818 * or tprintf). Allow some space over the normal hiwater mark so we don't 1819 * lose messages due to normal flow control, but don't let the tty run amok. 1820 * Sleeps here are not interruptible, but we return prematurely if new signals 1821 * arrive. 1822 */ 1823 int 1824 ttycheckoutq(tp, wait) 1825 struct tty *tp; 1826 int wait; 1827 { 1828 int hiwat; 1829 sigset_t oldmask; 1830 1831 hiwat = tp->t_ohiwat; 1832 SIGEMPTYSET(oldmask); 1833 crit_enter(); 1834 if (wait) 1835 oldmask = curproc->p_siglist; 1836 if (tp->t_outq.c_cc > hiwat + OBUFSIZ + 100) { 1837 while (tp->t_outq.c_cc > hiwat) { 1838 ttstart(tp); 1839 if (tp->t_outq.c_cc <= hiwat) 1840 break; 1841 if (!(wait && SIGSETEQ(curproc->p_siglist, oldmask))) { 1842 crit_exit(); 1843 return (0); 1844 } 1845 SET(tp->t_state, TS_SO_OLOWAT); 1846 tsleep(TSA_OLOWAT(tp), 0, "ttoutq", hz); 1847 } 1848 } 1849 crit_exit(); 1850 return (1); 1851 } 1852 1853 /* 1854 * Process a write call on a tty device. 1855 */ 1856 int 1857 ttwrite(tp, uio, flag) 1858 struct tty *tp; 1859 struct uio *uio; 1860 int flag; 1861 { 1862 char *cp = NULL; 1863 int cc, ce; 1864 struct proc *pp; 1865 int i, hiwat, cnt, error; 1866 char obuf[OBUFSIZ]; 1867 1868 hiwat = tp->t_ohiwat; 1869 cnt = uio->uio_resid; 1870 error = 0; 1871 cc = 0; 1872 loop: 1873 crit_enter(); 1874 if (ISSET(tp->t_state, TS_ZOMBIE)) { 1875 crit_exit(); 1876 if (uio->uio_resid == cnt) 1877 error = EIO; 1878 goto out; 1879 } 1880 if (!ISSET(tp->t_state, TS_CONNECTED)) { 1881 if (flag & IO_NDELAY) { 1882 crit_exit(); 1883 error = EWOULDBLOCK; 1884 goto out; 1885 } 1886 error = ttysleep(tp, TSA_CARR_ON(tp), PCATCH, "ttydcd", 0); 1887 crit_exit(); 1888 if (error) 1889 goto out; 1890 goto loop; 1891 } 1892 crit_exit(); 1893 1894 /* 1895 * Hang the process if it's in the background. 1896 */ 1897 if ((pp = curproc) && isbackground(pp, tp) && 1898 ISSET(tp->t_lflag, TOSTOP) && !(pp->p_flag & P_PPWAIT) && 1899 !SIGISMEMBER(pp->p_sigignore, SIGTTOU) && 1900 !SIGISMEMBER(pp->p_sigmask, SIGTTOU)) { 1901 if (pp->p_pgrp->pg_jobc == 0) { 1902 error = EIO; 1903 goto out; 1904 } 1905 pgsignal(pp->p_pgrp, SIGTTOU, 1); 1906 error = ttysleep(tp, &lbolt, PCATCH, "ttybg4", 0); 1907 if (error) 1908 goto out; 1909 goto loop; 1910 } 1911 /* 1912 * Process the user's data in at most OBUFSIZ chunks. Perform any 1913 * output translation. Keep track of high water mark, sleep on 1914 * overflow awaiting device aid in acquiring new space. 1915 */ 1916 while (uio->uio_resid > 0 || cc > 0) { 1917 if (ISSET(tp->t_lflag, FLUSHO)) { 1918 uio->uio_resid = 0; 1919 return (0); 1920 } 1921 if (tp->t_outq.c_cc > hiwat) 1922 goto ovhiwat; 1923 /* 1924 * Grab a hunk of data from the user, unless we have some 1925 * leftover from last time. 1926 */ 1927 if (cc == 0) { 1928 cc = imin(uio->uio_resid, OBUFSIZ); 1929 cp = obuf; 1930 error = uiomove(cp, cc, uio); 1931 if (error) { 1932 cc = 0; 1933 break; 1934 } 1935 } 1936 /* 1937 * If nothing fancy need be done, grab those characters we 1938 * can handle without any of ttyoutput's processing and 1939 * just transfer them to the output q. For those chars 1940 * which require special processing (as indicated by the 1941 * bits in char_type), call ttyoutput. After processing 1942 * a hunk of data, look for FLUSHO so ^O's will take effect 1943 * immediately. 1944 */ 1945 while (cc > 0) { 1946 if (!ISSET(tp->t_oflag, OPOST)) 1947 ce = cc; 1948 else { 1949 ce = cc - scanc((u_int)cc, (u_char *)cp, 1950 char_type, CCLASSMASK); 1951 /* 1952 * If ce is zero, then we're processing 1953 * a special character through ttyoutput. 1954 */ 1955 if (ce == 0) { 1956 tp->t_rocount = 0; 1957 if (ttyoutput(*cp, tp) >= 0) { 1958 /* No Clists, wait a bit. */ 1959 ttstart(tp); 1960 if (flag & IO_NDELAY) { 1961 error = EWOULDBLOCK; 1962 goto out; 1963 } 1964 error = ttysleep(tp, &lbolt, 1965 PCATCH, 1966 "ttybf1", 0); 1967 if (error) 1968 goto out; 1969 goto loop; 1970 } 1971 cp++; 1972 cc--; 1973 if (ISSET(tp->t_lflag, FLUSHO) || 1974 tp->t_outq.c_cc > hiwat) 1975 goto ovhiwat; 1976 continue; 1977 } 1978 } 1979 /* 1980 * A bunch of normal characters have been found. 1981 * Transfer them en masse to the output queue and 1982 * continue processing at the top of the loop. 1983 * If there are any further characters in this 1984 * <= OBUFSIZ chunk, the first should be a character 1985 * requiring special handling by ttyoutput. 1986 */ 1987 tp->t_rocount = 0; 1988 i = b_to_q(cp, ce, &tp->t_outq); 1989 ce -= i; 1990 tp->t_column += ce; 1991 cp += ce, cc -= ce, tk_nout += ce; 1992 tp->t_outcc += ce; 1993 if (i > 0) { 1994 /* No Clists, wait a bit. */ 1995 ttstart(tp); 1996 if (flag & IO_NDELAY) { 1997 error = EWOULDBLOCK; 1998 goto out; 1999 } 2000 error = ttysleep(tp, &lbolt, PCATCH, 2001 "ttybf2", 0); 2002 if (error) 2003 goto out; 2004 goto loop; 2005 } 2006 if (ISSET(tp->t_lflag, FLUSHO) || 2007 tp->t_outq.c_cc > hiwat) 2008 break; 2009 } 2010 ttstart(tp); 2011 } 2012 out: 2013 /* 2014 * If cc is nonzero, we leave the uio structure inconsistent, as the 2015 * offset and iov pointers have moved forward, but it doesn't matter 2016 * (the call will either return short or restart with a new uio). 2017 */ 2018 uio->uio_resid += cc; 2019 return (error); 2020 2021 ovhiwat: 2022 ttstart(tp); 2023 crit_enter(); 2024 /* 2025 * This can only occur if FLUSHO is set in t_lflag, 2026 * or if ttstart/oproc is synchronous (or very fast). 2027 */ 2028 if (tp->t_outq.c_cc <= hiwat) { 2029 crit_exit(); 2030 goto loop; 2031 } 2032 if (flag & IO_NDELAY) { 2033 crit_exit(); 2034 uio->uio_resid += cc; 2035 return (uio->uio_resid == cnt ? EWOULDBLOCK : 0); 2036 } 2037 SET(tp->t_state, TS_SO_OLOWAT); 2038 error = ttysleep(tp, TSA_OLOWAT(tp), PCATCH, "ttywri", tp->t_timeout); 2039 crit_exit(); 2040 if (error == EWOULDBLOCK) 2041 error = EIO; 2042 if (error) 2043 goto out; 2044 goto loop; 2045 } 2046 2047 /* 2048 * Rubout one character from the rawq of tp 2049 * as cleanly as possible. 2050 */ 2051 static void 2052 ttyrub(c, tp) 2053 int c; 2054 struct tty *tp; 2055 { 2056 char *cp; 2057 int savecol; 2058 int tabc; 2059 2060 if (!ISSET(tp->t_lflag, ECHO) || ISSET(tp->t_lflag, EXTPROC)) 2061 return; 2062 CLR(tp->t_lflag, FLUSHO); 2063 if (ISSET(tp->t_lflag, ECHOE)) { 2064 if (tp->t_rocount == 0) { 2065 /* 2066 * Screwed by ttwrite; retype 2067 */ 2068 ttyretype(tp); 2069 return; 2070 } 2071 if (c == ('\t' | TTY_QUOTE) || c == ('\n' | TTY_QUOTE)) 2072 ttyrubo(tp, 2); 2073 else { 2074 CLR(c, ~TTY_CHARMASK); 2075 switch (CCLASS(c)) { 2076 case ORDINARY: 2077 ttyrubo(tp, 1); 2078 break; 2079 case BACKSPACE: 2080 case CONTROL: 2081 case NEWLINE: 2082 case RETURN: 2083 case VTAB: 2084 if (ISSET(tp->t_lflag, ECHOCTL)) 2085 ttyrubo(tp, 2); 2086 break; 2087 case TAB: 2088 if (tp->t_rocount < tp->t_rawq.c_cc) { 2089 ttyretype(tp); 2090 return; 2091 } 2092 crit_enter(); 2093 savecol = tp->t_column; 2094 SET(tp->t_state, TS_CNTTB); 2095 SET(tp->t_lflag, FLUSHO); 2096 tp->t_column = tp->t_rocol; 2097 cp = tp->t_rawq.c_cf; 2098 if (cp) 2099 tabc = *cp; /* XXX FIX NEXTC */ 2100 for (; cp; cp = nextc(&tp->t_rawq, cp, &tabc)) 2101 ttyecho(tabc, tp); 2102 CLR(tp->t_lflag, FLUSHO); 2103 CLR(tp->t_state, TS_CNTTB); 2104 crit_exit(); 2105 2106 /* savecol will now be length of the tab. */ 2107 savecol -= tp->t_column; 2108 tp->t_column += savecol; 2109 if (savecol > 8) 2110 savecol = 8; /* overflow screw */ 2111 while (--savecol >= 0) 2112 (void)ttyoutput('\b', tp); 2113 break; 2114 default: /* XXX */ 2115 #define PANICSTR "ttyrub: would panic c = %d, val = %d\n" 2116 (void)printf(PANICSTR, c, CCLASS(c)); 2117 #ifdef notdef 2118 panic(PANICSTR, c, CCLASS(c)); 2119 #endif 2120 } 2121 } 2122 } else if (ISSET(tp->t_lflag, ECHOPRT)) { 2123 if (!ISSET(tp->t_state, TS_ERASE)) { 2124 SET(tp->t_state, TS_ERASE); 2125 (void)ttyoutput('\\', tp); 2126 } 2127 ttyecho(c, tp); 2128 } else { 2129 ttyecho(tp->t_cc[VERASE], tp); 2130 /* 2131 * This code may be executed not only when an ERASE key 2132 * is pressed, but also when ^U (KILL) or ^W (WERASE) are. 2133 * So, I didn't think it was worthwhile to pass the extra 2134 * information (which would need an extra parameter, 2135 * changing every call) needed to distinguish the ERASE2 2136 * case from the ERASE. 2137 */ 2138 } 2139 --tp->t_rocount; 2140 } 2141 2142 /* 2143 * Back over cnt characters, erasing them. 2144 */ 2145 static void 2146 ttyrubo(tp, cnt) 2147 struct tty *tp; 2148 int cnt; 2149 { 2150 2151 while (cnt-- > 0) { 2152 (void)ttyoutput('\b', tp); 2153 (void)ttyoutput(' ', tp); 2154 (void)ttyoutput('\b', tp); 2155 } 2156 } 2157 2158 /* 2159 * ttyretype -- 2160 * Reprint the rawq line. Note, it is assumed that c_cc has already 2161 * been checked. 2162 */ 2163 static void 2164 ttyretype(tp) 2165 struct tty *tp; 2166 { 2167 char *cp; 2168 int c; 2169 2170 /* Echo the reprint character. */ 2171 if (tp->t_cc[VREPRINT] != _POSIX_VDISABLE) 2172 ttyecho(tp->t_cc[VREPRINT], tp); 2173 2174 (void)ttyoutput('\n', tp); 2175 2176 /* 2177 * XXX 2178 * FIX: NEXTC IS BROKEN - DOESN'T CHECK QUOTE 2179 * BIT OF FIRST CHAR. 2180 */ 2181 crit_enter(); 2182 for (cp = tp->t_canq.c_cf, c = (cp != NULL ? *cp : 0); 2183 cp != NULL; cp = nextc(&tp->t_canq, cp, &c)) 2184 ttyecho(c, tp); 2185 for (cp = tp->t_rawq.c_cf, c = (cp != NULL ? *cp : 0); 2186 cp != NULL; cp = nextc(&tp->t_rawq, cp, &c)) 2187 ttyecho(c, tp); 2188 CLR(tp->t_state, TS_ERASE); 2189 crit_exit(); 2190 2191 tp->t_rocount = tp->t_rawq.c_cc; 2192 tp->t_rocol = 0; 2193 } 2194 2195 /* 2196 * Echo a typed character to the terminal. 2197 */ 2198 static void 2199 ttyecho(c, tp) 2200 int c; 2201 struct tty *tp; 2202 { 2203 2204 if (!ISSET(tp->t_state, TS_CNTTB)) 2205 CLR(tp->t_lflag, FLUSHO); 2206 if ((!ISSET(tp->t_lflag, ECHO) && 2207 (c != '\n' || !ISSET(tp->t_lflag, ECHONL))) || 2208 ISSET(tp->t_lflag, EXTPROC)) 2209 return; 2210 if (ISSET(tp->t_lflag, ECHOCTL) && 2211 ((ISSET(c, TTY_CHARMASK) <= 037 && c != '\t' && c != '\n') || 2212 ISSET(c, TTY_CHARMASK) == 0177)) { 2213 (void)ttyoutput('^', tp); 2214 CLR(c, ~TTY_CHARMASK); 2215 if (c == 0177) 2216 c = '?'; 2217 else 2218 c += 'A' - 1; 2219 } 2220 (void)ttyoutput(c, tp); 2221 } 2222 2223 /* 2224 * Wake up any readers on a tty. 2225 */ 2226 void 2227 ttwakeup(tp) 2228 struct tty *tp; 2229 { 2230 2231 if (tp->t_rsel.si_pid != 0) 2232 selwakeup(&tp->t_rsel); 2233 if (ISSET(tp->t_state, TS_ASYNC) && tp->t_sigio != NULL) 2234 pgsigio(tp->t_sigio, SIGIO, (tp->t_session != NULL)); 2235 wakeup(TSA_HUP_OR_INPUT(tp)); 2236 KNOTE(&tp->t_rsel.si_note, 0); 2237 } 2238 2239 /* 2240 * Wake up any writers on a tty. 2241 */ 2242 void 2243 ttwwakeup(tp) 2244 struct tty *tp; 2245 { 2246 2247 if (tp->t_wsel.si_pid != 0 && tp->t_outq.c_cc <= tp->t_olowat) 2248 selwakeup(&tp->t_wsel); 2249 if (ISSET(tp->t_state, TS_ASYNC) && tp->t_sigio != NULL) 2250 pgsigio(tp->t_sigio, SIGIO, (tp->t_session != NULL)); 2251 if (ISSET(tp->t_state, TS_BUSY | TS_SO_OCOMPLETE) == 2252 TS_SO_OCOMPLETE && tp->t_outq.c_cc == 0) { 2253 CLR(tp->t_state, TS_SO_OCOMPLETE); 2254 wakeup(TSA_OCOMPLETE(tp)); 2255 } 2256 if (ISSET(tp->t_state, TS_SO_OLOWAT) && 2257 tp->t_outq.c_cc <= tp->t_olowat) { 2258 CLR(tp->t_state, TS_SO_OLOWAT); 2259 wakeup(TSA_OLOWAT(tp)); 2260 } 2261 KNOTE(&tp->t_wsel.si_note, 0); 2262 } 2263 2264 /* 2265 * Look up a code for a specified speed in a conversion table; 2266 * used by drivers to map software speed values to hardware parameters. 2267 */ 2268 int 2269 ttspeedtab(speed, table) 2270 int speed; 2271 struct speedtab *table; 2272 { 2273 2274 for ( ; table->sp_speed != -1; table++) 2275 if (table->sp_speed == speed) 2276 return (table->sp_code); 2277 return (-1); 2278 } 2279 2280 /* 2281 * Set input and output watermarks and buffer sizes. For input, the 2282 * high watermark is about one second's worth of input above empty, the 2283 * low watermark is slightly below high water, and the buffer size is a 2284 * driver-dependent amount above high water. For output, the watermarks 2285 * are near the ends of the buffer, with about 1 second's worth of input 2286 * between them. All this only applies to the standard line discipline. 2287 */ 2288 void 2289 ttsetwater(tp) 2290 struct tty *tp; 2291 { 2292 int cps, ttmaxhiwat, x; 2293 2294 /* Input. */ 2295 clist_alloc_cblocks(&tp->t_canq, TTYHOG, 512); 2296 switch (tp->t_ispeedwat) { 2297 case (speed_t)-1: 2298 cps = tp->t_ispeed / 10; 2299 break; 2300 case 0: 2301 /* 2302 * This case is for old drivers that don't know about 2303 * t_ispeedwat. Arrange for them to get the old buffer 2304 * sizes and watermarks. 2305 */ 2306 cps = TTYHOG - 2 * 256; 2307 tp->t_ififosize = 2 * 256; 2308 break; 2309 default: 2310 cps = tp->t_ispeedwat / 10; 2311 break; 2312 } 2313 tp->t_ihiwat = cps; 2314 tp->t_ilowat = 7 * cps / 8; 2315 x = cps + tp->t_ififosize; 2316 clist_alloc_cblocks(&tp->t_rawq, x, x); 2317 2318 /* Output. */ 2319 switch (tp->t_ospeedwat) { 2320 case (speed_t)-1: 2321 cps = tp->t_ospeed / 10; 2322 ttmaxhiwat = 2 * TTMAXHIWAT; 2323 break; 2324 case 0: 2325 cps = tp->t_ospeed / 10; 2326 ttmaxhiwat = TTMAXHIWAT; 2327 break; 2328 default: 2329 cps = tp->t_ospeedwat / 10; 2330 ttmaxhiwat = 8 * TTMAXHIWAT; 2331 break; 2332 } 2333 #define CLAMP(x, h, l) ((x) > h ? h : ((x) < l) ? l : (x)) 2334 tp->t_olowat = x = CLAMP(cps / 2, TTMAXLOWAT, TTMINLOWAT); 2335 x += cps; 2336 x = CLAMP(x, ttmaxhiwat, TTMINHIWAT); /* XXX clamps are too magic */ 2337 tp->t_ohiwat = roundup(x, CBSIZE); /* XXX for compat */ 2338 x = imax(tp->t_ohiwat, TTMAXHIWAT); /* XXX for compat/safety */ 2339 x += OBUFSIZ + 100; 2340 clist_alloc_cblocks(&tp->t_outq, x, x); 2341 #undef CLAMP 2342 } 2343 2344 /* 2345 * Report on state of foreground process group. 2346 */ 2347 void 2348 ttyinfo(tp) 2349 struct tty *tp; 2350 { 2351 struct proc *p, *pick; 2352 struct timeval utime, stime; 2353 int tmp; 2354 2355 if (ttycheckoutq(tp,0) == 0) 2356 return; 2357 2358 /* 2359 * We always print the load average, then figure out what else to 2360 * print based on the state of the current process group. 2361 */ 2362 tmp = (averunnable.ldavg[0] * 100 + FSCALE / 2) >> FSHIFT; 2363 ttyprintf(tp, "load: %d.%02d ", tmp / 100, tmp % 100); 2364 2365 if (tp->t_session == NULL) { 2366 ttyprintf(tp, "not a controlling terminal\n"); 2367 } else if (tp->t_pgrp == NULL) { 2368 ttyprintf(tp, "no foreground process group\n"); 2369 } else if ((p = LIST_FIRST(&tp->t_pgrp->pg_members)) == 0) { 2370 ttyprintf(tp, "empty foreground process group\n"); 2371 } else { 2372 /* 2373 * Pick an interesting process. Note that certain elements, 2374 * in particular the wmesg, require a critical section for 2375 * safe access (YYY and we are still not MP safe). 2376 * 2377 * NOTE: p_wmesg is p_thread->td_wmesg, and p_comm is 2378 * p_thread->td_comm. 2379 */ 2380 char buf[64]; 2381 const char *str; 2382 int isinmem; 2383 long vmsz; 2384 int pctcpu; 2385 2386 crit_enter(); 2387 2388 for (pick = NULL; p != 0; p = LIST_NEXT(p, p_pglist)) { 2389 if (proc_compare(pick, p)) 2390 pick = p; 2391 } 2392 2393 /* 2394 * Figure out what wait/process-state message, and command 2395 * buffer to present 2396 */ 2397 if (pick->p_thread == NULL) 2398 str = "exiting"; 2399 else if (pick->p_stat == SRUN) 2400 str = "running"; 2401 else if (pick->p_wmesg) /* p_thread must not be NULL */ 2402 str = pick->p_wmesg; 2403 else 2404 str = "iowait"; 2405 2406 snprintf(buf, sizeof(buf), "cmd: %s %d [%s]", 2407 (pick->p_thread ? pick->p_comm : "?"), 2408 pick->p_pid, str); 2409 2410 /* 2411 * Calculate cpu usage, percent cpu, and cmsz. Note that 2412 * 'pick' becomes invalid the moment we exit the critical 2413 * section. 2414 */ 2415 if (pick->p_thread && (pick->p_flag & P_INMEM)) { 2416 calcru(pick, &utime, &stime, NULL); 2417 isinmem = 1; 2418 } else { 2419 isinmem = 0; 2420 } 2421 2422 pctcpu = (pick->p_pctcpu * 10000 + FSCALE / 2) >> FSHIFT; 2423 2424 if (pick->p_stat == SIDL || pick->p_stat == SZOMB) 2425 vmsz = 0; 2426 else 2427 vmsz = pgtok(vmspace_resident_count(pick->p_vmspace)); 2428 2429 crit_exit(); 2430 2431 /* 2432 * Dump the output 2433 */ 2434 ttyprintf(tp, " %s ", buf); 2435 if (isinmem) { 2436 ttyprintf(tp, "%ld.%02ldu ", 2437 utime.tv_sec, utime.tv_usec / 10000); 2438 ttyprintf(tp, "%ld.%02lds ", 2439 stime.tv_sec, stime.tv_usec / 10000); 2440 } else { 2441 ttyprintf(tp, "?.??u ?.??s "); 2442 } 2443 ttyprintf(tp, "%d%% %ldk\n", pctcpu / 100, vmsz); 2444 } 2445 tp->t_rocount = 0; /* so pending input will be retyped if BS */ 2446 } 2447 2448 /* 2449 * Returns 1 if p2 is "better" than p1 2450 * 2451 * The algorithm for picking the "interesting" process is thus: 2452 * 2453 * 1) Only foreground processes are eligible - implied. 2454 * 2) Runnable processes are favored over anything else. The runner 2455 * with the highest cpu utilization is picked (p_cpticks). Ties are 2456 * broken by picking the highest pid. 2457 * 3) The sleeper with the shortest sleep time is next. With ties, 2458 * we pick out just "short-term" sleepers (P_SINTR == 0). 2459 * 4) Further ties are broken by picking the highest pid. 2460 */ 2461 #define ISRUN(p) (((p)->p_stat == SRUN) || ((p)->p_stat == SIDL)) 2462 #define TESTAB(a, b) ((a)<<1 | (b)) 2463 #define ONLYA 2 2464 #define ONLYB 1 2465 #define BOTH 3 2466 2467 static int 2468 proc_compare(p1, p2) 2469 struct proc *p1, *p2; 2470 { 2471 2472 if (p1 == NULL) 2473 return (1); 2474 /* 2475 * see if at least one of them is runnable 2476 */ 2477 switch (TESTAB(ISRUN(p1), ISRUN(p2))) { 2478 case ONLYA: 2479 return (0); 2480 case ONLYB: 2481 return (1); 2482 case BOTH: 2483 /* 2484 * tie - favor one with highest recent cpu utilization 2485 */ 2486 if (p2->p_cpticks > p1->p_cpticks) 2487 return (1); 2488 if (p1->p_cpticks > p2->p_cpticks) 2489 return (0); 2490 return (p2->p_pid > p1->p_pid); /* tie - return highest pid */ 2491 } 2492 /* 2493 * weed out zombies 2494 */ 2495 switch (TESTAB(p1->p_stat == SZOMB, p2->p_stat == SZOMB)) { 2496 case ONLYA: 2497 return (1); 2498 case ONLYB: 2499 return (0); 2500 case BOTH: 2501 return (p2->p_pid > p1->p_pid); /* tie - return highest pid */ 2502 } 2503 /* 2504 * pick the one with the smallest sleep time 2505 */ 2506 if (p2->p_slptime > p1->p_slptime) 2507 return (0); 2508 if (p1->p_slptime > p2->p_slptime) 2509 return (1); 2510 /* 2511 * favor one sleeping in a non-interruptible sleep 2512 */ 2513 if (p1->p_flag & P_SINTR && (p2->p_flag & P_SINTR) == 0) 2514 return (1); 2515 if (p2->p_flag & P_SINTR && (p1->p_flag & P_SINTR) == 0) 2516 return (0); 2517 return (p2->p_pid > p1->p_pid); /* tie - return highest pid */ 2518 } 2519 2520 /* 2521 * Output char to tty; console putchar style. 2522 */ 2523 int 2524 tputchar(c, tp) 2525 int c; 2526 struct tty *tp; 2527 { 2528 crit_enter(); 2529 if (!ISSET(tp->t_state, TS_CONNECTED)) { 2530 crit_exit(); 2531 return (-1); 2532 } 2533 if (c == '\n') 2534 (void)ttyoutput('\r', tp); 2535 (void)ttyoutput(c, tp); 2536 ttstart(tp); 2537 crit_exit(); 2538 return (0); 2539 } 2540 2541 /* 2542 * Sleep on chan, returning ERESTART if tty changed while we napped and 2543 * returning any errors (e.g. EINTR/EWOULDBLOCK) reported by tsleep. If 2544 * the tty is revoked, restarting a pending call will redo validation done 2545 * at the start of the call. 2546 */ 2547 int 2548 ttysleep(tp, chan, slpflags, wmesg, timo) 2549 struct tty *tp; 2550 void *chan; 2551 int slpflags, timo; 2552 char *wmesg; 2553 { 2554 int error; 2555 int gen; 2556 2557 gen = tp->t_gen; 2558 error = tsleep(chan, slpflags, wmesg, timo); 2559 if (error) 2560 return (error); 2561 return (tp->t_gen == gen ? 0 : ERESTART); 2562 } 2563 2564 /* 2565 * Allocate a tty struct. Clists in the struct will be allocated by 2566 * ttyopen(). 2567 */ 2568 struct tty * 2569 ttymalloc(tp) 2570 struct tty *tp; 2571 { 2572 2573 if (tp) 2574 return(tp); 2575 tp = malloc(sizeof *tp, M_TTYS, M_WAITOK|M_ZERO); 2576 ttyregister(tp); 2577 return (tp); 2578 } 2579 2580 #if 0 2581 /* 2582 * Free a tty struct. Clists in the struct should have been freed by 2583 * ttyclose(). 2584 * 2585 * XXX not yet usable: since we support a half-closed state and do not 2586 * ref count the tty reference from the session, it is possible for a 2587 * session to hold a ref on the tty. See TTY_DO_FULL_CLOSE. 2588 */ 2589 void 2590 ttyfree(tp) 2591 struct tty *tp; 2592 { 2593 free(tp, M_TTYS); 2594 } 2595 #endif /* 0 */ 2596 2597 void 2598 ttyregister(tp) 2599 struct tty *tp; 2600 { 2601 SLIST_INSERT_HEAD(&tty_list, tp, t_list); 2602 } 2603 2604 static int 2605 sysctl_kern_ttys(SYSCTL_HANDLER_ARGS) 2606 { 2607 int error; 2608 struct tty *tp, t; 2609 SLIST_FOREACH(tp, &tty_list, t_list) { 2610 t = *tp; 2611 if (t.t_dev) 2612 t.t_dev = (dev_t)dev2udev(t.t_dev); 2613 error = SYSCTL_OUT(req, (caddr_t)&t, sizeof(t)); 2614 if (error) 2615 return (error); 2616 } 2617 return (0); 2618 } 2619 2620 SYSCTL_PROC(_kern, OID_AUTO, ttys, CTLTYPE_OPAQUE|CTLFLAG_RD, 2621 0, 0, sysctl_kern_ttys, "S,tty", "All struct ttys"); 2622 2623 void 2624 nottystop(tp, rw) 2625 struct tty *tp; 2626 int rw; 2627 { 2628 2629 return; 2630 } 2631 2632 int 2633 ttyread(dev, uio, flag) 2634 dev_t dev; 2635 struct uio *uio; 2636 int flag; 2637 { 2638 struct tty *tp; 2639 2640 tp = dev->si_tty; 2641 if (tp == NULL) 2642 return (ENODEV); 2643 return ((*linesw[tp->t_line].l_read)(tp, uio, flag)); 2644 } 2645 2646 int 2647 ttywrite(dev, uio, flag) 2648 dev_t dev; 2649 struct uio *uio; 2650 int flag; 2651 { 2652 struct tty *tp; 2653 2654 tp = dev->si_tty; 2655 if (tp == NULL) 2656 return (ENODEV); 2657 return ((*linesw[tp->t_line].l_write)(tp, uio, flag)); 2658 } 2659