tty.c revision 6336
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 * $Id: tty.c,v 1.23 1995/02/13 02:03:57 ache Exp $ 40 */ 41 42#include <sys/param.h> 43#include <sys/systm.h> 44#include <sys/ioctl.h> 45#include <sys/proc.h> 46#define TTYDEFCHARS 47#include <sys/tty.h> 48#undef TTYDEFCHARS 49#include <sys/file.h> 50#include <sys/conf.h> 51#include <sys/dkstat.h> 52#include <sys/uio.h> 53#include <sys/kernel.h> 54#include <sys/vnode.h> 55#include <sys/syslog.h> 56#include <sys/signalvar.h> 57#include <sys/resourcevar.h> 58#include <sys/malloc.h> 59 60#include <vm/vm.h> 61 62static int proc_compare __P((struct proc *p1, struct proc *p2)); 63static void ttyblock __P((struct tty *tp)); 64static void ttyecho __P((int, struct tty *tp)); 65static void ttyrubo __P((struct tty *, int)); 66 67/* Symbolic sleep message strings. */ 68char ttclos[] = "ttycls"; 69char ttopen[] = "ttyopn"; 70char ttybg[] = "ttybg"; 71char ttybuf[] = "ttybuf"; 72char ttyin[] = "ttyin"; 73char ttyout[] = "ttyout"; 74 75/* 76 * Table with character classes and parity. The 8th bit indicates parity, 77 * the 7th bit indicates the character is an alphameric or underscore (for 78 * ALTWERASE), and the low 6 bits indicate delay type. If the low 6 bits 79 * are 0 then the character needs no special processing on output; classes 80 * other than 0 might be translated or (not currently) require delays. 81 */ 82#define E 0x00 /* Even parity. */ 83#define O 0x80 /* Odd parity. */ 84#define PARITY(c) (char_type[c] & O) 85 86#define ALPHA 0x40 /* Alpha or underscore. */ 87#define ISALPHA(c) (char_type[(c) & TTY_CHARMASK] & ALPHA) 88 89#define CCLASSMASK 0x3f 90#define CCLASS(c) (char_type[c] & CCLASSMASK) 91 92#define BS BACKSPACE 93#define CC CONTROL 94#define CR RETURN 95#define NA ORDINARY | ALPHA 96#define NL NEWLINE 97#define NO ORDINARY 98#define TB TAB 99#define VT VTAB 100 101char const char_type[] = { 102 E|CC, O|CC, O|CC, E|CC, O|CC, E|CC, E|CC, O|CC, /* nul - bel */ 103 O|BS, E|TB, E|NL, O|CC, E|VT, O|CR, O|CC, E|CC, /* bs - si */ 104 O|CC, E|CC, E|CC, O|CC, E|CC, O|CC, O|CC, E|CC, /* dle - etb */ 105 E|CC, O|CC, O|CC, E|CC, O|CC, E|CC, E|CC, O|CC, /* can - us */ 106 O|NO, E|NO, E|NO, O|NO, E|NO, O|NO, O|NO, E|NO, /* sp - ' */ 107 E|NO, O|NO, O|NO, E|NO, O|NO, E|NO, E|NO, O|NO, /* ( - / */ 108 E|NA, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* 0 - 7 */ 109 O|NA, E|NA, E|NO, O|NO, E|NO, O|NO, O|NO, E|NO, /* 8 - ? */ 110 O|NO, E|NA, E|NA, O|NA, E|NA, O|NA, O|NA, E|NA, /* @ - G */ 111 E|NA, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* H - O */ 112 E|NA, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* P - W */ 113 O|NA, E|NA, E|NA, O|NO, E|NO, O|NO, O|NO, O|NA, /* X - _ */ 114 E|NO, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* ` - g */ 115 O|NA, E|NA, E|NA, O|NA, E|NA, O|NA, O|NA, E|NA, /* h - o */ 116 O|NA, E|NA, E|NA, O|NA, E|NA, O|NA, O|NA, E|NA, /* p - w */ 117 E|NA, O|NA, O|NA, E|NO, O|NO, E|NO, E|NO, O|CC, /* x - del */ 118 /* 119 * Meta chars; should be settable per character set; 120 * for now, treat them all as normal characters. 121 */ 122 NA, NA, NA, NA, NA, NA, NA, NA, 123 NA, NA, NA, NA, NA, NA, NA, NA, 124 NA, NA, NA, NA, NA, NA, NA, NA, 125 NA, NA, NA, NA, NA, NA, NA, NA, 126 NA, NA, NA, NA, NA, NA, NA, NA, 127 NA, NA, NA, NA, NA, NA, NA, NA, 128 NA, NA, NA, NA, NA, NA, NA, NA, 129 NA, NA, NA, NA, NA, NA, NA, NA, 130 NA, NA, NA, NA, NA, NA, NA, NA, 131 NA, NA, NA, NA, NA, NA, NA, NA, 132 NA, NA, NA, NA, NA, NA, NA, NA, 133 NA, NA, NA, NA, NA, NA, NA, NA, 134 NA, NA, NA, NA, NA, NA, NA, NA, 135 NA, NA, NA, NA, NA, NA, NA, NA, 136 NA, NA, NA, NA, NA, NA, NA, NA, 137 NA, NA, NA, NA, NA, NA, NA, NA, 138}; 139#undef BS 140#undef CC 141#undef CR 142#undef NA 143#undef NL 144#undef NO 145#undef TB 146#undef VT 147 148/* Macros to clear/set/test flags. */ 149#define SET(t, f) (t) |= (f) 150#define CLR(t, f) (t) &= ~(f) 151#define ISSET(t, f) ((t) & (f)) 152 153/* 154 * Initial open of tty, or (re)entry to standard tty line discipline. 155 */ 156int 157ttyopen(device, tp) 158 dev_t device; 159 register struct tty *tp; 160{ 161 int s; 162 163 s = spltty(); 164 tp->t_dev = device; 165 if (!ISSET(tp->t_state, TS_ISOPEN)) { 166 SET(tp->t_state, TS_ISOPEN); 167 bzero(&tp->t_winsize, sizeof(tp->t_winsize)); 168 } 169 CLR(tp->t_state, TS_WOPEN); 170 171 /* 172 * Initialize or restore a cblock allocation policy suitable for 173 * the standard line discipline. 174 */ 175 clist_alloc_cblocks(&tp->t_canq, TTYHOG, 512); 176 clist_alloc_cblocks(&tp->t_outq, TTMAXHIWAT + 200, 512); 177 clist_alloc_cblocks(&tp->t_rawq, TTYHOG, TTYHOG); 178 179 splx(s); 180 return (0); 181} 182 183/* 184 * Handle close() on a tty line: flush and set to initial state, 185 * bumping generation number so that pending read/write calls 186 * can detect recycling of the tty. 187 */ 188int 189ttyclose(tp) 190 register struct tty *tp; 191{ 192 extern struct tty *constty; /* Temporary virtual console. */ 193 int s; 194 195 s = spltty(); 196 if (constty == tp) 197 constty = NULL; 198 199 ttyflush(tp, FREAD | FWRITE); 200 clist_free_cblocks(&tp->t_canq); 201 clist_free_cblocks(&tp->t_outq); 202 clist_free_cblocks(&tp->t_rawq); 203 204 tp->t_gen++; 205 tp->t_pgrp = NULL; 206 tp->t_session = NULL; 207 tp->t_state = 0; 208 splx(s); 209 return (0); 210} 211 212#define FLUSHQ(q) { \ 213 if ((q)->c_cc) \ 214 ndflush(q, (q)->c_cc); \ 215} 216 217/* Is 'c' a line delimiter ("break" character)? */ 218#define TTBREAKC(c) \ 219 ((c) == '\n' || (((c) == cc[VEOF] || \ 220 (c) == cc[VEOL] || (c) == cc[VEOL2]) && (c) != _POSIX_VDISABLE)) 221 222 223/* 224 * Process input of a single character received on a tty. 225 */ 226int 227ttyinput(c, tp) 228 register int c; 229 register struct tty *tp; 230{ 231 register int iflag, lflag; 232 register u_char *cc; 233 int i, err; 234 235 /* 236 * If input is pending take it first. 237 */ 238 lflag = tp->t_lflag; 239 if (ISSET(lflag, PENDIN)) 240 ttypend(tp); 241 /* 242 * Gather stats. 243 */ 244 if (ISSET(lflag, ICANON)) { 245 ++tk_cancc; 246 ++tp->t_cancc; 247 } else { 248 ++tk_rawcc; 249 ++tp->t_rawcc; 250 } 251 ++tk_nin; 252 253 /* Handle exceptional conditions (break, parity, framing). */ 254 cc = tp->t_cc; 255 iflag = tp->t_iflag; 256 err = (ISSET(c, TTY_ERRORMASK)); 257 if (err) { 258 CLR(c, TTY_ERRORMASK); 259 if (ISSET(err, TTY_FE) && !c) { /* Break. */ 260 if (ISSET(iflag, IGNBRK)) 261 goto endcase; 262 else if (ISSET(iflag, BRKINT) && 263 ISSET(lflag, ISIG) && 264 (cc[VINTR] != _POSIX_VDISABLE)) 265 c = cc[VINTR]; 266 else if (ISSET(iflag, PARMRK)) 267 goto parmrk; 268 } else if ((ISSET(err, TTY_PE) && ISSET(iflag, INPCK)) 269 || ISSET(err, TTY_FE)) { 270 if (ISSET(iflag, IGNPAR)) 271 goto endcase; 272 else if (ISSET(iflag, PARMRK)) { 273parmrk: (void)putc(0377 | TTY_QUOTE, &tp->t_rawq); 274 (void)putc(0 | TTY_QUOTE, &tp->t_rawq); 275 (void)putc(c | TTY_QUOTE, &tp->t_rawq); 276 goto endcase; 277 } else 278 c = 0; 279 } 280 } 281 /* 282 * In tandem mode, check high water mark. 283 */ 284 if (ISSET(iflag, IXOFF)) 285 ttyblock(tp); 286 if (!ISSET(tp->t_state, TS_TYPEN) && ISSET(iflag, ISTRIP)) 287 CLR(c, 0x80); 288 if (!ISSET(lflag, EXTPROC)) { 289 /* 290 * Check for literal nexting very first 291 */ 292 if (ISSET(tp->t_state, TS_LNCH)) { 293 SET(c, TTY_QUOTE); 294 CLR(tp->t_state, TS_LNCH); 295 } 296 /* 297 * Scan for special characters. This code 298 * is really just a big case statement with 299 * non-constant cases. The bottom of the 300 * case statement is labeled ``endcase'', so goto 301 * it after a case match, or similar. 302 */ 303 304 /* 305 * Control chars which aren't controlled 306 * by ICANON, ISIG, or IXON. 307 */ 308 if (ISSET(lflag, IEXTEN)) { 309 if (CCEQ(cc[VLNEXT], c)) { 310 if (ISSET(lflag, ECHO)) { 311 if (ISSET(lflag, ECHOE)) { 312 (void)ttyoutput('^', tp); 313 (void)ttyoutput('\b', tp); 314 } else 315 ttyecho(c, tp); 316 } 317 SET(tp->t_state, TS_LNCH); 318 goto endcase; 319 } 320 if (CCEQ(cc[VDISCARD], c)) { 321 if (ISSET(lflag, FLUSHO)) 322 CLR(tp->t_lflag, FLUSHO); 323 else { 324 ttyflush(tp, FWRITE); 325 ttyecho(c, tp); 326 if (tp->t_rawq.c_cc + tp->t_canq.c_cc) 327 ttyretype(tp); 328 SET(tp->t_lflag, FLUSHO); 329 } 330 goto startoutput; 331 } 332 } 333 /* 334 * Signals. 335 */ 336 if (ISSET(lflag, ISIG)) { 337 if (CCEQ(cc[VINTR], c) || CCEQ(cc[VQUIT], c)) { 338 if (!ISSET(lflag, NOFLSH)) 339 ttyflush(tp, FREAD | FWRITE); 340 ttyecho(c, tp); 341 pgsignal(tp->t_pgrp, 342 CCEQ(cc[VINTR], c) ? SIGINT : SIGQUIT, 1); 343 goto endcase; 344 } 345 if (CCEQ(cc[VSUSP], c)) { 346 if (!ISSET(lflag, NOFLSH)) 347 ttyflush(tp, FREAD); 348 ttyecho(c, tp); 349 pgsignal(tp->t_pgrp, SIGTSTP, 1); 350 goto endcase; 351 } 352 } 353 /* 354 * Handle start/stop characters. 355 */ 356 if (ISSET(iflag, IXON)) { 357 if (CCEQ(cc[VSTOP], c)) { 358 if (!ISSET(tp->t_state, TS_TTSTOP)) { 359 SET(tp->t_state, TS_TTSTOP); 360#ifdef sun4c /* XXX */ 361 (*tp->t_stop)(tp, 0); 362#else 363 (*cdevsw[major(tp->t_dev)].d_stop)(tp, 364 0); 365#endif 366 return (0); 367 } 368 if (!CCEQ(cc[VSTART], c)) 369 return (0); 370 /* 371 * if VSTART == VSTOP then toggle 372 */ 373 goto endcase; 374 } 375 if (CCEQ(cc[VSTART], c)) 376 goto restartoutput; 377 } 378 /* 379 * IGNCR, ICRNL, & INLCR 380 */ 381 if (c == '\r') { 382 if (ISSET(iflag, IGNCR)) 383 goto endcase; 384 else if (ISSET(iflag, ICRNL)) 385 c = '\n'; 386 } else if (c == '\n' && ISSET(iflag, INLCR)) 387 c = '\r'; 388 } 389 if (!ISSET(tp->t_lflag, EXTPROC) && ISSET(lflag, ICANON)) { 390 /* 391 * From here on down canonical mode character 392 * processing takes place. 393 */ 394 /* 395 * erase (^H / ^?) 396 */ 397 if (CCEQ(cc[VERASE], c)) { 398 if (tp->t_rawq.c_cc) 399 ttyrub(unputc(&tp->t_rawq), tp); 400 goto endcase; 401 } 402 /* 403 * kill (^U) 404 */ 405 if (CCEQ(cc[VKILL], c)) { 406 if (ISSET(lflag, ECHOKE) && 407 tp->t_rawq.c_cc == tp->t_rocount && 408 !ISSET(lflag, ECHOPRT)) 409 while (tp->t_rawq.c_cc) 410 ttyrub(unputc(&tp->t_rawq), tp); 411 else { 412 ttyecho(c, tp); 413 if (ISSET(lflag, ECHOK) || 414 ISSET(lflag, ECHOKE)) 415 ttyecho('\n', tp); 416 FLUSHQ(&tp->t_rawq); 417 tp->t_rocount = 0; 418 } 419 CLR(tp->t_state, TS_LOCAL); 420 goto endcase; 421 } 422 /* 423 * word erase (^W) 424 */ 425 if (CCEQ(cc[VWERASE], c)) { 426 int alt = ISSET(lflag, ALTWERASE); 427 int ctype; 428 429 /* 430 * erase whitespace 431 */ 432 while ((c = unputc(&tp->t_rawq)) == ' ' || c == '\t') 433 ttyrub(c, tp); 434 if (c == -1) 435 goto endcase; 436 /* 437 * erase last char of word and remember the 438 * next chars type (for ALTWERASE) 439 */ 440 ttyrub(c, tp); 441 c = unputc(&tp->t_rawq); 442 if (c == -1) 443 goto endcase; 444 if (c == ' ' || c == '\t') { 445 (void)putc(c, &tp->t_rawq); 446 goto endcase; 447 } 448 ctype = ISALPHA(c); 449 /* 450 * erase rest of word 451 */ 452 do { 453 ttyrub(c, tp); 454 c = unputc(&tp->t_rawq); 455 if (c == -1) 456 goto endcase; 457 } while (c != ' ' && c != '\t' && 458 (alt == 0 || ISALPHA(c) == ctype)); 459 (void)putc(c, &tp->t_rawq); 460 goto endcase; 461 } 462 /* 463 * reprint line (^R) 464 */ 465 if (CCEQ(cc[VREPRINT], c)) { 466 ttyretype(tp); 467 goto endcase; 468 } 469 /* 470 * ^T - kernel info and generate SIGINFO 471 */ 472 if (CCEQ(cc[VSTATUS], c)) { 473 if (ISSET(lflag, ISIG)) 474 pgsignal(tp->t_pgrp, SIGINFO, 1); 475 if (!ISSET(lflag, NOKERNINFO)) 476 ttyinfo(tp); 477 goto endcase; 478 } 479 } 480 /* 481 * Check for input buffer overflow 482 */ 483 if (tp->t_rawq.c_cc + tp->t_canq.c_cc >= TTYHOG) { 484 if (ISSET(iflag, IMAXBEL)) { 485 if (tp->t_outq.c_cc < tp->t_hiwat) 486 (void)ttyoutput(CTRL('g'), tp); 487 } else 488 ttyflush(tp, FREAD | FWRITE); 489 goto endcase; 490 } 491 /* 492 * Put data char in q for user and 493 * wakeup on seeing a line delimiter. 494 */ 495 if (putc(c, &tp->t_rawq) >= 0) { 496 if (!ISSET(lflag, ICANON)) { 497 ttwakeup(tp); 498 ttyecho(c, tp); 499 goto endcase; 500 } 501 if (TTBREAKC(c)) { 502 tp->t_rocount = 0; 503 catq(&tp->t_rawq, &tp->t_canq); 504 ttwakeup(tp); 505 } else if (tp->t_rocount++ == 0) 506 tp->t_rocol = tp->t_column; 507 if (ISSET(tp->t_state, TS_ERASE)) { 508 /* 509 * end of prterase \.../ 510 */ 511 CLR(tp->t_state, TS_ERASE); 512 (void)ttyoutput('/', tp); 513 } 514 i = tp->t_column; 515 ttyecho(c, tp); 516 if (CCEQ(cc[VEOF], c) && ISSET(lflag, ECHO)) { 517 /* 518 * Place the cursor over the '^' of the ^D. 519 */ 520 i = min(2, tp->t_column - i); 521 while (i > 0) { 522 (void)ttyoutput('\b', tp); 523 i--; 524 } 525 } 526 } 527endcase: 528 /* 529 * IXANY means allow any character to restart output. 530 */ 531 if (ISSET(tp->t_state, TS_TTSTOP) && 532 !ISSET(iflag, IXANY) && cc[VSTART] != cc[VSTOP]) 533 return (0); 534restartoutput: 535 CLR(tp->t_lflag, FLUSHO); 536 CLR(tp->t_state, TS_TTSTOP); 537startoutput: 538 return (ttstart(tp)); 539} 540 541/* 542 * Output a single character on a tty, doing output processing 543 * as needed (expanding tabs, newline processing, etc.). 544 * Returns < 0 if succeeds, otherwise returns char to resend. 545 * Must be recursive. 546 */ 547int 548ttyoutput(c, tp) 549 register int c; 550 register struct tty *tp; 551{ 552 register long oflag; 553 register int col, s; 554 555 oflag = tp->t_oflag; 556 if (!ISSET(oflag, OPOST)) { 557 if (ISSET(tp->t_lflag, FLUSHO)) 558 return (-1); 559 if (putc(c, &tp->t_outq)) 560 return (c); 561 tk_nout++; 562 tp->t_outcc++; 563 return (-1); 564 } 565 /* 566 * Do tab expansion if OXTABS is set. Special case if we external 567 * processing, we don't do the tab expansion because we'll probably 568 * get it wrong. If tab expansion needs to be done, let it happen 569 * externally. 570 */ 571 CLR(c, ~TTY_CHARMASK); 572 if (c == '\t' && 573 ISSET(oflag, OXTABS) && !ISSET(tp->t_lflag, EXTPROC)) { 574 c = 8 - (tp->t_column & 7); 575 if (!ISSET(tp->t_lflag, FLUSHO)) { 576 s = spltty(); /* Don't interrupt tabs. */ 577 c -= b_to_q(" ", c, &tp->t_outq); 578 tk_nout += c; 579 tp->t_outcc += c; 580 splx(s); 581 } 582 tp->t_column += c; 583 return (c ? -1 : '\t'); 584 } 585 if (c == CEOT && ISSET(oflag, ONOEOT)) 586 return (-1); 587 588 /* 589 * Newline translation: if ONLCR is set, 590 * translate newline into "\r\n". 591 */ 592 if (c == '\n' && ISSET(tp->t_oflag, ONLCR)) { 593 tk_nout++; 594 tp->t_outcc++; 595 if (putc('\r', &tp->t_outq)) 596 return (c); 597 } 598 tk_nout++; 599 tp->t_outcc++; 600 if (!ISSET(tp->t_lflag, FLUSHO) && putc(c, &tp->t_outq)) 601 return (c); 602 603 col = tp->t_column; 604 switch (CCLASS(c)) { 605 case BACKSPACE: 606 if (col > 0) 607 --col; 608 break; 609 case CONTROL: 610 break; 611 case NEWLINE: 612 case RETURN: 613 col = 0; 614 break; 615 case ORDINARY: 616 ++col; 617 break; 618 case TAB: 619 col = (col + 8) & ~7; 620 break; 621 } 622 tp->t_column = col; 623 return (-1); 624} 625 626/* 627 * Ioctls for all tty devices. Called after line-discipline specific ioctl 628 * has been called to do discipline-specific functions and/or reject any 629 * of these ioctl commands. 630 */ 631/* ARGSUSED */ 632int 633ttioctl(tp, cmd, data, flag) 634 register struct tty *tp; 635 int cmd, flag; 636 void *data; 637{ 638 extern struct tty *constty; /* Temporary virtual console. */ 639 extern int nlinesw; 640 register struct proc *p; 641 int s, error; 642 643 p = curproc; /* XXX */ 644 645 /* If the ioctl involves modification, hang if in the background. */ 646 switch (cmd) { 647 case TIOCFLUSH: 648 case TIOCSETA: 649 case TIOCSETD: 650 case TIOCSETAF: 651 case TIOCSETAW: 652#ifdef notdef 653 case TIOCSPGRP: 654#endif 655 case TIOCSTAT: 656 case TIOCSTI: 657 case TIOCSWINSZ: 658#if defined(COMPAT_43) || defined(COMPAT_SUNOS) 659 case TIOCLBIC: 660 case TIOCLBIS: 661 case TIOCLSET: 662 case TIOCSETC: 663 case OTIOCSETD: 664 case TIOCSETN: 665 case TIOCSETP: 666 case TIOCSLTC: 667#endif 668 while (isbackground(curproc, tp) && 669 p->p_pgrp->pg_jobc && (p->p_flag & P_PPWAIT) == 0 && 670 (p->p_sigignore & sigmask(SIGTTOU)) == 0 && 671 (p->p_sigmask & sigmask(SIGTTOU)) == 0) { 672 pgsignal(p->p_pgrp, SIGTTOU, 1); 673 error = ttysleep(tp, &lbolt, TTOPRI | PCATCH, ttybg, 0); 674 if (error) 675 return (error); 676 } 677 break; 678 } 679 680 switch (cmd) { /* Process the ioctl. */ 681 case FIOASYNC: /* set/clear async i/o */ 682 s = spltty(); 683 if (*(int *)data) 684 SET(tp->t_state, TS_ASYNC); 685 else 686 CLR(tp->t_state, TS_ASYNC); 687 splx(s); 688 break; 689 case FIONBIO: /* set/clear non-blocking i/o */ 690 break; /* XXX: delete. */ 691 case FIONREAD: /* get # bytes to read */ 692 *(int *)data = ttnread(tp); 693 break; 694 case TIOCEXCL: /* set exclusive use of tty */ 695 s = spltty(); 696 SET(tp->t_state, TS_XCLUDE); 697 splx(s); 698 break; 699 case TIOCFLUSH: { /* flush buffers */ 700 register int flags = *(int *)data; 701 702 if (flags == 0) 703 flags = FREAD | FWRITE; 704 else 705 flags &= FREAD | FWRITE; 706 ttyflush(tp, flags); 707 break; 708 } 709 case TIOCCONS: /* become virtual console */ 710 if (*(int *)data) { 711 if (constty && constty != tp && 712 ISSET(constty->t_state, TS_CARR_ON | TS_ISOPEN) == 713 (TS_CARR_ON | TS_ISOPEN)) 714 return (EBUSY); 715#ifndef UCONSOLE 716 if (error = suser(p->p_ucred, &p->p_acflag)) 717 return (error); 718#endif 719 constty = tp; 720 } else if (tp == constty) 721 constty = NULL; 722 break; 723 case TIOCDRAIN: /* wait till output drained */ 724 error = ttywait(tp); 725 if (error) 726 return (error); 727 break; 728 case TIOCGETA: { /* get termios struct */ 729 struct termios *t = (struct termios *)data; 730 731 bcopy(&tp->t_termios, t, sizeof(struct termios)); 732 break; 733 } 734 case TIOCGETD: /* get line discipline */ 735 *(int *)data = tp->t_line; 736 break; 737 case TIOCGWINSZ: /* get window size */ 738 *(struct winsize *)data = tp->t_winsize; 739 break; 740 case TIOCGPGRP: /* get pgrp of tty */ 741 if (!isctty(p, tp)) 742 return (ENOTTY); 743 *(int *)data = tp->t_pgrp ? tp->t_pgrp->pg_id : NO_PID; 744 break; 745#ifdef TIOCHPCL 746 case TIOCHPCL: /* hang up on last close */ 747 s = spltty(); 748 SET(tp->t_cflag, HUPCL); 749 splx(s); 750 break; 751#endif 752 case TIOCNXCL: /* reset exclusive use of tty */ 753 s = spltty(); 754 CLR(tp->t_state, TS_XCLUDE); 755 splx(s); 756 break; 757 case TIOCOUTQ: /* output queue size */ 758 *(int *)data = tp->t_outq.c_cc; 759 break; 760 case TIOCSETA: /* set termios struct */ 761 case TIOCSETAW: /* drain output, set */ 762 case TIOCSETAF: { /* drn out, fls in, set */ 763 register struct termios *t = (struct termios *)data; 764 765 s = spltty(); 766 if (cmd == TIOCSETAW || cmd == TIOCSETAF) { 767 error = ttywait(tp); 768 if (error) { 769 splx(s); 770 return (error); 771 } 772 if (cmd == TIOCSETAF) 773 ttyflush(tp, FREAD); 774 } 775 if (!ISSET(t->c_cflag, CIGNORE)) { 776 /* 777 * Set device hardware. 778 */ 779 if (tp->t_param && (error = (*tp->t_param)(tp, t))) { 780 splx(s); 781 return (error); 782 } else { 783 if (!ISSET(tp->t_state, TS_CARR_ON) && 784 ISSET(tp->t_cflag, CLOCAL) && 785 !ISSET(t->c_cflag, CLOCAL)) { 786#if 0 787 CLR(tp->t_state, TS_ISOPEN); 788 SET(tp->t_state, TS_WOPEN); 789#endif 790 ttwakeup(tp); 791 } 792 tp->t_cflag = t->c_cflag; 793 tp->t_ispeed = t->c_ispeed; 794 tp->t_ospeed = t->c_ospeed; 795 } 796 ttsetwater(tp); 797 } 798 if (cmd != TIOCSETAF) { 799 if (ISSET(t->c_lflag, ICANON) != 800 ISSET(tp->t_lflag, ICANON)) 801 if (ISSET(t->c_lflag, ICANON)) { 802 SET(tp->t_lflag, PENDIN); 803 ttwakeup(tp); 804 } else { 805 struct clist tq; 806 807 catq(&tp->t_rawq, &tp->t_canq); 808 tq = tp->t_rawq; 809 tp->t_rawq = tp->t_canq; 810 tp->t_canq = tq; 811 CLR(tp->t_lflag, PENDIN); 812 } 813 } 814 tp->t_iflag = t->c_iflag; 815 tp->t_oflag = t->c_oflag; 816 /* 817 * Make the EXTPROC bit read only. 818 */ 819 if (ISSET(tp->t_lflag, EXTPROC)) 820 SET(t->c_lflag, EXTPROC); 821 else 822 CLR(t->c_lflag, EXTPROC); 823 tp->t_lflag = t->c_lflag | ISSET(tp->t_lflag, PENDIN); 824 if (t->c_cc[VMIN] != tp->t_cc[VMIN] || 825 t->c_cc[VTIME] != tp->t_cc[VTIME]) 826 ttwakeup(tp); 827 bcopy(t->c_cc, tp->t_cc, sizeof(t->c_cc)); 828 splx(s); 829 break; 830 } 831 case TIOCSETD: { /* set line discipline */ 832 register int t = *(int *)data; 833 dev_t device = tp->t_dev; 834 835 if ((u_int)t >= nlinesw) 836 return (ENXIO); 837 if (t != tp->t_line) { 838 s = spltty(); 839 (*linesw[tp->t_line].l_close)(tp, flag); 840 error = (*linesw[t].l_open)(device, tp); 841 if (error) { 842 (void)(*linesw[tp->t_line].l_open)(device, tp); 843 splx(s); 844 return (error); 845 } 846 tp->t_line = t; 847 splx(s); 848 } 849 break; 850 } 851 case TIOCSTART: /* start output, like ^Q */ 852 s = spltty(); 853 if (ISSET(tp->t_state, TS_TTSTOP) || 854 ISSET(tp->t_lflag, FLUSHO)) { 855 CLR(tp->t_lflag, FLUSHO); 856 CLR(tp->t_state, TS_TTSTOP); 857 ttstart(tp); 858 } 859 splx(s); 860 break; 861 case TIOCSTI: /* simulate terminal input */ 862 if (p->p_ucred->cr_uid && (flag & FREAD) == 0) 863 return (EPERM); 864 if (p->p_ucred->cr_uid && !isctty(p, tp)) 865 return (EACCES); 866 (*linesw[tp->t_line].l_rint)(*(u_char *)data, tp); 867 break; 868 case TIOCSTOP: /* stop output, like ^S */ 869 s = spltty(); 870 if (!ISSET(tp->t_state, TS_TTSTOP)) { 871 SET(tp->t_state, TS_TTSTOP); 872#ifdef sun4c /* XXX */ 873 (*tp->t_stop)(tp, 0); 874#else 875 (*cdevsw[major(tp->t_dev)].d_stop)(tp, 0); 876#endif 877 } 878 splx(s); 879 break; 880 case TIOCSCTTY: /* become controlling tty */ 881 /* Session ctty vnode pointer set in vnode layer. */ 882 if (!SESS_LEADER(p) || 883 ((p->p_session->s_ttyvp || tp->t_session) && 884 (tp->t_session != p->p_session))) 885 return (EPERM); 886 tp->t_session = p->p_session; 887 tp->t_pgrp = p->p_pgrp; 888 p->p_session->s_ttyp = tp; 889 p->p_flag |= P_CONTROLT; 890 break; 891 case TIOCSPGRP: { /* set pgrp of tty */ 892 register struct pgrp *pgrp = pgfind(*(int *)data); 893 894 if (!isctty(p, tp)) 895 return (ENOTTY); 896 else if (pgrp == NULL || pgrp->pg_session != p->p_session) 897 return (EPERM); 898 tp->t_pgrp = pgrp; 899 break; 900 } 901 case TIOCSTAT: /* simulate control-T */ 902 ttyinfo(tp); 903 break; 904 case TIOCSWINSZ: /* set window size */ 905 if (bcmp((caddr_t)&tp->t_winsize, data, 906 sizeof (struct winsize))) { 907 tp->t_winsize = *(struct winsize *)data; 908 pgsignal(tp->t_pgrp, SIGWINCH, 1); 909 } 910 break; 911 case TIOCSDRAINWAIT: 912 error = suser(p->p_ucred, &p->p_acflag); 913 if (error) 914 return (error); 915 tp->t_timeout = *(int *)data * hz; 916 wakeup((caddr_t)&tp->t_outq); 917 break; 918 case TIOCGDRAINWAIT: 919 *(int *)data = tp->t_timeout / hz; 920 break; 921 default: 922#if defined(COMPAT_43) || defined(COMPAT_SUNOS) 923 return (ttcompat(tp, cmd, data, flag)); 924#else 925 return (-1); 926#endif 927 } 928 return (0); 929} 930 931int 932ttselect(device, rw, p) 933 dev_t device; 934 int rw; 935 struct proc *p; 936{ 937 register struct tty *tp; 938 int nread, s; 939 940 tp = &cdevsw[major(device)].d_ttys[minor(device)]; 941 942 s = spltty(); 943 switch (rw) { 944 case FREAD: 945 nread = ttnread(tp); 946 if (nread > 0 || (!ISSET(tp->t_cflag, CLOCAL) && 947 !ISSET(tp->t_state, TS_CARR_ON))) 948 goto win; 949 selrecord(p, &tp->t_rsel); 950 break; 951 case FWRITE: 952 if (tp->t_outq.c_cc <= tp->t_lowat) { 953win: splx(s); 954 return (1); 955 } 956 selrecord(p, &tp->t_wsel); 957 break; 958 } 959 splx(s); 960 return (0); 961} 962 963/* 964 * This is now exported to the cy driver as well; if you hack this code, 965 * then be sure to keep /sys/i386/isa/cy.c properly advised! -jkh 966 */ 967int 968ttnread(tp) 969 struct tty *tp; 970{ 971 int nread; 972 973 if (ISSET(tp->t_lflag, PENDIN)) 974 ttypend(tp); 975 nread = tp->t_canq.c_cc; 976 if (!ISSET(tp->t_lflag, ICANON)) { 977 nread += tp->t_rawq.c_cc; 978 if (nread < tp->t_cc[VMIN] && tp->t_cc[VTIME] == 0) 979 nread = 0; 980 } 981 return (nread); 982} 983 984/* 985 * Wait for output to drain. 986 */ 987int 988ttywait(tp) 989 register struct tty *tp; 990{ 991 int error, s; 992 993 error = 0; 994 s = spltty(); 995 while ((tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY)) && 996 (ISSET(tp->t_state, TS_CARR_ON) || ISSET(tp->t_cflag, CLOCAL)) 997 && tp->t_oproc) { 998 (*tp->t_oproc)(tp); 999 if ((tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY)) && 1000 (ISSET(tp->t_state, TS_CARR_ON) || ISSET(tp->t_cflag, CLOCAL))) { 1001 SET(tp->t_state, TS_ASLEEP); 1002 error = ttysleep(tp, &tp->t_outq, TTOPRI | PCATCH, 1003 ttyout, tp->t_timeout); 1004 if (error) 1005 break; 1006 } 1007 } 1008 if (!error && (tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY))) 1009 error = EIO; 1010 splx(s); 1011 return (error); 1012} 1013 1014/* 1015 * Flush if successfully wait. 1016 */ 1017int 1018ttywflush(tp) 1019 struct tty *tp; 1020{ 1021 int error; 1022 1023 if ((error = ttywait(tp)) == 0) 1024 ttyflush(tp, FREAD); 1025 return (error); 1026} 1027 1028/* 1029 * Flush tty read and/or write queues, notifying anyone waiting. 1030 */ 1031void 1032ttyflush(tp, rw) 1033 register struct tty *tp; 1034 int rw; 1035{ 1036 register int s; 1037 1038 s = spltty(); 1039 if (rw & FWRITE) 1040 CLR(tp->t_state, TS_TTSTOP); 1041#ifdef sun4c /* XXX */ 1042 (*tp->t_stop)(tp, rw); 1043#else 1044 (*cdevsw[major(tp->t_dev)].d_stop)(tp, rw); 1045#endif 1046 if (rw & FREAD) { 1047 FLUSHQ(&tp->t_canq); 1048 FLUSHQ(&tp->t_rawq); 1049 tp->t_rocount = 0; 1050 tp->t_rocol = 0; 1051 CLR(tp->t_state, TS_LOCAL); 1052 ttwakeup(tp); 1053 } 1054 if (rw & FWRITE) { 1055 FLUSHQ(&tp->t_outq); 1056 wakeup((caddr_t)&tp->t_outq); 1057 selwakeup(&tp->t_wsel); 1058 } 1059 splx(s); 1060} 1061 1062/* 1063 * Copy in the default termios characters. 1064 */ 1065void 1066ttychars(tp) 1067 struct tty *tp; 1068{ 1069 1070 bcopy(ttydefchars, tp->t_cc, sizeof(ttydefchars)); 1071} 1072 1073/* 1074 * Send stop character on input overflow. 1075 */ 1076static void 1077ttyblock(tp) 1078 register struct tty *tp; 1079{ 1080 register int total; 1081 1082 total = tp->t_rawq.c_cc + tp->t_canq.c_cc; 1083 if (tp->t_rawq.c_cc > TTYHOG) { 1084 ttyflush(tp, FREAD | FWRITE); 1085 CLR(tp->t_state, TS_TBLOCK); 1086 } 1087 /* 1088 * Block further input iff: current input > threshold 1089 * AND input is available to user program. 1090 */ 1091 if ((total >= TTYHOG / 2 && 1092 !ISSET(tp->t_state, TS_TBLOCK) && 1093 !ISSET(tp->t_lflag, ICANON)) || (tp->t_canq.c_cc > 0 && 1094 tp->t_cc[VSTOP] != _POSIX_VDISABLE)) { 1095 if (putc(tp->t_cc[VSTOP], &tp->t_outq) == 0) { 1096 SET(tp->t_state, TS_TBLOCK); 1097 ttstart(tp); 1098 } 1099 } 1100} 1101 1102void 1103ttrstrt(tp_arg) 1104 void *tp_arg; 1105{ 1106 struct tty *tp; 1107 int s; 1108 1109#ifdef DIAGNOSTIC 1110 if (tp_arg == NULL) 1111 panic("ttrstrt"); 1112#endif 1113 tp = tp_arg; 1114 s = spltty(); 1115 1116 CLR(tp->t_state, TS_TIMEOUT); 1117 ttstart(tp); 1118 1119 splx(s); 1120} 1121 1122int 1123ttstart(tp) 1124 struct tty *tp; 1125{ 1126 1127 if (tp->t_oproc != NULL) /* XXX: Kludge for pty. */ 1128 (*tp->t_oproc)(tp); 1129 return (0); 1130} 1131 1132/* 1133 * "close" a line discipline 1134 */ 1135int 1136ttylclose(tp, flag) 1137 struct tty *tp; 1138 int flag; 1139{ 1140 1141 if ((flag & IO_NDELAY) || ttywflush(tp)) 1142 ttyflush(tp, FREAD | FWRITE); 1143 return (0); 1144} 1145 1146/* 1147 * Handle modem control transition on a tty. 1148 * Flag indicates new state of carrier. 1149 * Returns 0 if the line should be turned off, otherwise 1. 1150 */ 1151int 1152ttymodem(tp, flag) 1153 register struct tty *tp; 1154 int flag; 1155{ 1156 1157 if (!ISSET(tp->t_state, TS_WOPEN) && ISSET(tp->t_cflag, MDMBUF)) { 1158 /* 1159 * MDMBUF: do flow control according to carrier flag 1160 */ 1161 if (flag) { 1162 CLR(tp->t_state, TS_TTSTOP); 1163 ttstart(tp); 1164 } else if (!ISSET(tp->t_state, TS_TTSTOP)) { 1165 SET(tp->t_state, TS_TTSTOP); 1166#ifdef sun4c /* XXX */ 1167 (*tp->t_stop)(tp, 0); 1168#else 1169 (*cdevsw[major(tp->t_dev)].d_stop)(tp, 0); 1170#endif 1171 } 1172 } else if (flag == 0) { 1173 /* 1174 * Lost carrier. 1175 */ 1176 CLR(tp->t_state, TS_CARR_ON); 1177 if (ISSET(tp->t_state, TS_ISOPEN) && 1178 !ISSET(tp->t_cflag, CLOCAL)) { 1179 if (tp->t_session && tp->t_session->s_leader) 1180 psignal(tp->t_session->s_leader, SIGHUP); 1181 ttyflush(tp, FREAD | FWRITE); 1182 return (0); 1183 } 1184 } else { 1185 /* 1186 * Carrier now on. 1187 */ 1188 SET(tp->t_state, TS_CARR_ON); 1189 ttwakeup(tp); 1190 } 1191 return (1); 1192} 1193 1194/* 1195 * Default modem control routine (for other line disciplines). 1196 * Return argument flag, to turn off device on carrier drop. 1197 */ 1198int 1199nullmodem(tp, flag) 1200 register struct tty *tp; 1201 int flag; 1202{ 1203 1204 if (flag) 1205 SET(tp->t_state, TS_CARR_ON); 1206 else { 1207 CLR(tp->t_state, TS_CARR_ON); 1208 if (!ISSET(tp->t_cflag, CLOCAL)) { 1209 if (tp->t_session && tp->t_session->s_leader) 1210 psignal(tp->t_session->s_leader, SIGHUP); 1211 return (0); 1212 } 1213 } 1214 return (1); 1215} 1216 1217/* 1218 * Reinput pending characters after state switch 1219 * call at spltty(). 1220 */ 1221void 1222ttypend(tp) 1223 register struct tty *tp; 1224{ 1225 struct clist tq; 1226 register c; 1227 1228 CLR(tp->t_lflag, PENDIN); 1229 SET(tp->t_state, TS_TYPEN); 1230 /* 1231 * XXX this assumes too much about clist internals. It may even 1232 * fail if the cblock slush pool is empty. We can't allocate more 1233 * cblocks here because we are called from an interrupt handler 1234 * and clist_alloc_cblocks() can wait. 1235 */ 1236 tq = tp->t_rawq; 1237 bzero(&tp->t_rawq, sizeof tp->t_rawq); 1238 tp->t_rawq.c_cbmax = tq.c_cbmax; 1239 tp->t_rawq.c_cbreserved = tq.c_cbreserved; 1240 while ((c = getc(&tq)) >= 0) 1241 ttyinput(c, tp); 1242 CLR(tp->t_state, TS_TYPEN); 1243} 1244 1245/* 1246 * Process a read call on a tty device. 1247 */ 1248int 1249ttread(tp, uio, flag) 1250 register struct tty *tp; 1251 struct uio *uio; 1252 int flag; 1253{ 1254 register struct clist *qp; 1255 register int c; 1256 register tcflag_t lflag; 1257 register cc_t *cc = tp->t_cc; 1258 register struct proc *p = curproc; 1259 int s, first, error = 0, carrier; 1260 int has_stime = 0, last_cc = 0; 1261 long slp = 0; /* XXX this should be renamed `timo'. */ 1262 1263loop: 1264 s = spltty(); 1265 lflag = tp->t_lflag; 1266 /* 1267 * take pending input first 1268 */ 1269 if (ISSET(lflag, PENDIN)) { 1270 ttypend(tp); 1271 splx(s); /* reduce latency */ 1272 s = spltty(); 1273 lflag = tp->t_lflag; /* XXX ttypend() clobbers it */ 1274 } 1275 1276 /* 1277 * Hang process if it's in the background. 1278 */ 1279 if (isbackground(p, tp)) { 1280 splx(s); 1281 if ((p->p_sigignore & sigmask(SIGTTIN)) || 1282 (p->p_sigmask & sigmask(SIGTTIN)) || 1283 p->p_flag & P_PPWAIT || p->p_pgrp->pg_jobc == 0) 1284 return (EIO); 1285 pgsignal(p->p_pgrp, SIGTTIN, 1); 1286 error = ttysleep(tp, &lbolt, TTIPRI | PCATCH, ttybg, 0); 1287 if (error) 1288 return (error); 1289 goto loop; 1290 } 1291 1292 /* 1293 * If canonical, use the canonical queue, 1294 * else use the raw queue. 1295 * 1296 * (should get rid of clists...) 1297 */ 1298 qp = ISSET(lflag, ICANON) ? &tp->t_canq : &tp->t_rawq; 1299 1300 if (flag & IO_NDELAY) { 1301 if (qp->c_cc > 0) 1302 goto read; 1303 carrier = ISSET(tp->t_state, TS_CARR_ON) || 1304 ISSET(tp->t_cflag, CLOCAL); 1305 if ((!carrier && ISSET(tp->t_state, TS_ISOPEN)) || 1306 !ISSET(lflag, ICANON) && cc[VMIN] == 0) { 1307 splx(s); 1308 return (0); 1309 } 1310 splx(s); 1311 return (EWOULDBLOCK); 1312 } 1313 if (!ISSET(lflag, ICANON)) { 1314 int m = cc[VMIN]; 1315 long t = cc[VTIME]; 1316 struct timeval stime, timecopy; 1317 int x; 1318 1319 /* 1320 * Check each of the four combinations. 1321 * (m > 0 && t == 0) is the normal read case. 1322 * It should be fairly efficient, so we check that and its 1323 * companion case (m == 0 && t == 0) first. 1324 * For the other two cases, we compute the target sleep time 1325 * into slp. 1326 */ 1327 if (t == 0) { 1328 if (qp->c_cc < m) 1329 goto sleep; 1330 if (qp->c_cc > 0) 1331 goto read; 1332 1333 /* m, t and qp->c_cc are all 0. 0 is enough input. */ 1334 splx(s); 1335 return (0); 1336 } 1337 t *= 100000; /* time in us */ 1338#define diff(t1, t2) (((t1).tv_sec - (t2).tv_sec) * 1000000 + \ 1339 ((t1).tv_usec - (t2).tv_usec)) 1340 if (m > 0) { 1341 if (qp->c_cc <= 0) 1342 goto sleep; 1343 if (qp->c_cc >= m) 1344 goto read; 1345 x = splclock(); 1346 timecopy = time; 1347 splx(x); 1348 if (!has_stime) { 1349 /* first character, start timer */ 1350 has_stime = 1; 1351 stime = timecopy; 1352 slp = t; 1353 } else if (qp->c_cc > last_cc) { 1354 /* got a character, restart timer */ 1355 stime = timecopy; 1356 slp = t; 1357 } else { 1358 /* nothing, check expiration */ 1359 slp = t - diff(timecopy, stime); 1360 if (slp <= 0) 1361 goto read; 1362 } 1363 last_cc = qp->c_cc; 1364 } else { /* m == 0 */ 1365 if (qp->c_cc > 0) 1366 goto read; 1367 x = splclock(); 1368 timecopy = time; 1369 splx(x); 1370 if (!has_stime) { 1371 has_stime = 1; 1372 stime = timecopy; 1373 slp = t; 1374 } else { 1375 slp = t - diff(timecopy, stime); 1376 if (slp <= 0) { 1377 /* Timed out, but 0 is enough input. */ 1378 splx(s); 1379 return (0); 1380 } 1381 } 1382 } 1383#undef diff 1384 /* 1385 * Rounding down may make us wake up just short 1386 * of the target, so we round up. 1387 * The formula is ceiling(slp * hz/1000000). 1388 * 32-bit arithmetic is enough for hz < 169. 1389 * XXX see hzto() for how to avoid overflow if hz 1390 * is large (divide by `tick' and/or arrange to 1391 * use hzto() if hz is large). 1392 */ 1393 slp = (long) (((u_long)slp * hz) + 999999) / 1000000; 1394 goto sleep; 1395 } 1396 1397 /* 1398 * If there is no input, sleep on rawq 1399 * awaiting hardware receipt and notification. 1400 * If we have data, we don't need to check for carrier. 1401 */ 1402 if (qp->c_cc <= 0) { 1403sleep: 1404 carrier = ISSET(tp->t_state, TS_CARR_ON) || 1405 ISSET(tp->t_cflag, CLOCAL); 1406 if (!carrier && ISSET(tp->t_state, TS_ISOPEN)) { 1407 splx(s); 1408 return (0); /* EOF */ 1409 } 1410 error = ttysleep(tp, &tp->t_rawq, TTIPRI | PCATCH, 1411 carrier ? ttyin : ttopen, (int)slp); 1412 splx(s); 1413 if (error == EWOULDBLOCK) 1414 error = 0; 1415 else if (error) 1416 return (error); 1417 /* 1418 * XXX what happens if another process eats some input 1419 * while we are asleep (not just here)? It would be 1420 * safest to detect changes and reset our state variables 1421 * (has_stime and last_cc). 1422 */ 1423 slp = 0; 1424 goto loop; 1425 } 1426read: 1427 splx(s); 1428 /* 1429 * Input present, check for input mapping and processing. 1430 */ 1431 first = 1; 1432 while ((c = getc(qp)) >= 0) { 1433 /* 1434 * delayed suspend (^Y) 1435 */ 1436 if (CCEQ(cc[VDSUSP], c) && ISSET(lflag, ISIG)) { 1437 pgsignal(tp->t_pgrp, SIGTSTP, 1); 1438 if (first) { 1439 error = ttysleep(tp, 1440 &lbolt, TTIPRI | PCATCH, ttybg, 0); 1441 if (error) 1442 break; 1443 goto loop; 1444 } 1445 break; 1446 } 1447 /* 1448 * Interpret EOF only in canonical mode. 1449 */ 1450 if (CCEQ(cc[VEOF], c) && ISSET(lflag, ICANON)) 1451 break; 1452 /* 1453 * Give user character. 1454 */ 1455 error = ureadc(c, uio); 1456 if (error) 1457 break; 1458 if (uio->uio_resid == 0) 1459 break; 1460 /* 1461 * In canonical mode check for a "break character" 1462 * marking the end of a "line of input". 1463 */ 1464 if (ISSET(lflag, ICANON) && TTBREAKC(c)) 1465 break; 1466 first = 0; 1467 } 1468 /* 1469 * Look to unblock output now that (presumably) 1470 * the input queue has gone down. 1471 */ 1472 s = spltty(); 1473 if (ISSET(tp->t_state, TS_TBLOCK) && tp->t_rawq.c_cc < TTYHOG/5) { 1474 if (cc[VSTART] != _POSIX_VDISABLE && 1475 putc(cc[VSTART], &tp->t_outq) == 0) { 1476 CLR(tp->t_state, TS_TBLOCK); 1477 ttstart(tp); 1478 } 1479 } 1480 splx(s); 1481 return (error); 1482} 1483 1484/* 1485 * Check the output queue on tp for space for a kernel message (from uprintf 1486 * or tprintf). Allow some space over the normal hiwater mark so we don't 1487 * lose messages due to normal flow control, but don't let the tty run amok. 1488 * Sleeps here are not interruptible, but we return prematurely if new signals 1489 * arrive. 1490 */ 1491int 1492ttycheckoutq(tp, wait) 1493 register struct tty *tp; 1494 int wait; 1495{ 1496 int hiwat, s, oldsig; 1497 1498 hiwat = tp->t_hiwat; 1499 s = spltty(); 1500 oldsig = wait ? curproc->p_siglist : 0; 1501 if (tp->t_outq.c_cc > hiwat + 200) 1502 while (tp->t_outq.c_cc > hiwat) { 1503 ttstart(tp); 1504 if (wait == 0 || curproc->p_siglist != oldsig) { 1505 splx(s); 1506 return (0); 1507 } 1508 timeout((void (*)__P((void *)))wakeup, 1509 (void *)&tp->t_outq, hz); 1510 SET(tp->t_state, TS_ASLEEP); 1511 (void) tsleep((caddr_t)&tp->t_outq, PZERO - 1, "ttoutq", 0); 1512 } 1513 splx(s); 1514 return (1); 1515} 1516 1517/* 1518 * Process a write call on a tty device. 1519 */ 1520int 1521ttwrite(tp, uio, flag) 1522 register struct tty *tp; 1523 register struct uio *uio; 1524 int flag; 1525{ 1526 register char *cp = 0; 1527 register int cc, ce; 1528 register struct proc *p; 1529 int i, hiwat, cnt, error, s; 1530 char obuf[OBUFSIZ]; 1531 1532 hiwat = tp->t_hiwat; 1533 cnt = uio->uio_resid; 1534 error = 0; 1535 cc = 0; 1536loop: 1537 s = spltty(); 1538 if (!ISSET(tp->t_state, TS_CARR_ON) && 1539 !ISSET(tp->t_cflag, CLOCAL)) { 1540 if (ISSET(tp->t_state, TS_ISOPEN)) { 1541 splx(s); 1542 return (EIO); 1543 } else if (flag & IO_NDELAY) { 1544 splx(s); 1545 error = EWOULDBLOCK; 1546 goto out; 1547 } else { 1548 /* Sleep awaiting carrier. */ 1549 error = ttysleep(tp, 1550 &tp->t_rawq, TTIPRI | PCATCH,ttopen, 0); 1551 splx(s); 1552 if (error) 1553 goto out; 1554 goto loop; 1555 } 1556 } 1557 splx(s); 1558 /* 1559 * Hang the process if it's in the background. 1560 */ 1561 p = curproc; 1562 if (isbackground(p, tp) && 1563 ISSET(tp->t_lflag, TOSTOP) && (p->p_flag & P_PPWAIT) == 0 && 1564 (p->p_sigignore & sigmask(SIGTTOU)) == 0 && 1565 (p->p_sigmask & sigmask(SIGTTOU)) == 0 && 1566 p->p_pgrp->pg_jobc) { 1567 pgsignal(p->p_pgrp, SIGTTOU, 1); 1568 error = ttysleep(tp, &lbolt, TTIPRI | PCATCH, ttybg, 0); 1569 if (error) 1570 goto out; 1571 goto loop; 1572 } 1573 /* 1574 * Process the user's data in at most OBUFSIZ chunks. Perform any 1575 * output translation. Keep track of high water mark, sleep on 1576 * overflow awaiting device aid in acquiring new space. 1577 */ 1578 while (uio->uio_resid > 0 || cc > 0) { 1579 if (ISSET(tp->t_lflag, FLUSHO)) { 1580 uio->uio_resid = 0; 1581 return (0); 1582 } 1583 if (tp->t_outq.c_cc > hiwat) 1584 goto ovhiwat; 1585 /* 1586 * Grab a hunk of data from the user, unless we have some 1587 * leftover from last time. 1588 */ 1589 if (cc == 0) { 1590 cc = min(uio->uio_resid, OBUFSIZ); 1591 cp = obuf; 1592 error = uiomove(cp, cc, uio); 1593 if (error) { 1594 cc = 0; 1595 break; 1596 } 1597 } 1598 /* 1599 * If nothing fancy need be done, grab those characters we 1600 * can handle without any of ttyoutput's processing and 1601 * just transfer them to the output q. For those chars 1602 * which require special processing (as indicated by the 1603 * bits in char_type), call ttyoutput. After processing 1604 * a hunk of data, look for FLUSHO so ^O's will take effect 1605 * immediately. 1606 */ 1607 while (cc > 0) { 1608 if (!ISSET(tp->t_oflag, OPOST)) 1609 ce = cc; 1610 else { 1611 ce = cc - scanc((u_int)cc, (u_char *)cp, 1612 (u_char *)char_type, CCLASSMASK); 1613 /* 1614 * If ce is zero, then we're processing 1615 * a special character through ttyoutput. 1616 */ 1617 if (ce == 0) { 1618 tp->t_rocount = 0; 1619 if (ttyoutput(*cp, tp) >= 0) { 1620 /* No Clists, wait a bit. */ 1621 ttstart(tp); 1622 if (flag & IO_NDELAY) { 1623 error = EWOULDBLOCK; 1624 goto out; 1625 } 1626 error = ttysleep(tp, &lbolt, 1627 TTOPRI | PCATCH, ttybuf, 0); 1628 if (error) 1629 goto out; 1630 goto loop; 1631 } 1632 cp++; 1633 cc--; 1634 if (ISSET(tp->t_lflag, FLUSHO) || 1635 tp->t_outq.c_cc > hiwat) 1636 goto ovhiwat; 1637 continue; 1638 } 1639 } 1640 /* 1641 * A bunch of normal characters have been found. 1642 * Transfer them en masse to the output queue and 1643 * continue processing at the top of the loop. 1644 * If there are any further characters in this 1645 * <= OBUFSIZ chunk, the first should be a character 1646 * requiring special handling by ttyoutput. 1647 */ 1648 tp->t_rocount = 0; 1649 i = b_to_q(cp, ce, &tp->t_outq); 1650 ce -= i; 1651 tp->t_column += ce; 1652 cp += ce, cc -= ce, tk_nout += ce; 1653 tp->t_outcc += ce; 1654 if (i > 0) { 1655 /* No Clists, wait a bit. */ 1656 ttstart(tp); 1657 if (flag & IO_NDELAY) { 1658 error = EWOULDBLOCK; 1659 goto out; 1660 } 1661 error = ttysleep(tp, 1662 &lbolt, TTOPRI | PCATCH, ttybuf, 0); 1663 if (error) 1664 goto out; 1665 goto loop; 1666 } 1667 if (ISSET(tp->t_lflag, FLUSHO) || 1668 tp->t_outq.c_cc > hiwat) 1669 break; 1670 } 1671 ttstart(tp); 1672 } 1673out: 1674 /* 1675 * If cc is nonzero, we leave the uio structure inconsistent, as the 1676 * offset and iov pointers have moved forward, but it doesn't matter 1677 * (the call will either return short or restart with a new uio). 1678 */ 1679 uio->uio_resid += cc; 1680 return (error); 1681 1682ovhiwat: 1683 ttstart(tp); 1684 s = spltty(); 1685 /* 1686 * This can only occur if FLUSHO is set in t_lflag, 1687 * or if ttstart/oproc is synchronous (or very fast). 1688 */ 1689 if (tp->t_outq.c_cc <= hiwat) { 1690 splx(s); 1691 goto loop; 1692 } 1693 if (flag & IO_NDELAY) { 1694 splx(s); 1695 uio->uio_resid += cc; 1696 return (uio->uio_resid == cnt ? EWOULDBLOCK : 0); 1697 } 1698 SET(tp->t_state, TS_ASLEEP); 1699 error = ttysleep(tp, &tp->t_outq, TTOPRI | PCATCH, ttyout, 0); 1700 splx(s); 1701 if (error) 1702 goto out; 1703 goto loop; 1704} 1705 1706/* 1707 * Rubout one character from the rawq of tp 1708 * as cleanly as possible. 1709 */ 1710void 1711ttyrub(c, tp) 1712 register int c; 1713 register struct tty *tp; 1714{ 1715 register char *cp; 1716 register int savecol; 1717 int tabc, s; 1718 1719 if (!ISSET(tp->t_lflag, ECHO) || ISSET(tp->t_lflag, EXTPROC)) 1720 return; 1721 CLR(tp->t_lflag, FLUSHO); 1722 if (ISSET(tp->t_lflag, ECHOE)) { 1723 if (tp->t_rocount == 0) { 1724 /* 1725 * Screwed by ttwrite; retype 1726 */ 1727 ttyretype(tp); 1728 return; 1729 } 1730 if (c == ('\t' | TTY_QUOTE) || c == ('\n' | TTY_QUOTE)) 1731 ttyrubo(tp, 2); 1732 else { 1733 CLR(c, ~TTY_CHARMASK); 1734 switch (CCLASS(c)) { 1735 case ORDINARY: 1736 ttyrubo(tp, 1); 1737 break; 1738 case BACKSPACE: 1739 case CONTROL: 1740 case NEWLINE: 1741 case RETURN: 1742 case VTAB: 1743 if (ISSET(tp->t_lflag, ECHOCTL)) 1744 ttyrubo(tp, 2); 1745 break; 1746 case TAB: 1747 if (tp->t_rocount < tp->t_rawq.c_cc) { 1748 ttyretype(tp); 1749 return; 1750 } 1751 s = spltty(); 1752 savecol = tp->t_column; 1753 SET(tp->t_state, TS_CNTTB); 1754 SET(tp->t_lflag, FLUSHO); 1755 tp->t_column = tp->t_rocol; 1756 cp = tp->t_rawq.c_cf; 1757 if (cp) 1758 tabc = *cp; /* XXX FIX NEXTC */ 1759 for (; cp; cp = nextc(&tp->t_rawq, cp, &tabc)) 1760 ttyecho(tabc, tp); 1761 CLR(tp->t_lflag, FLUSHO); 1762 CLR(tp->t_state, TS_CNTTB); 1763 splx(s); 1764 1765 /* savecol will now be length of the tab. */ 1766 savecol -= tp->t_column; 1767 tp->t_column += savecol; 1768 if (savecol > 8) 1769 savecol = 8; /* overflow screw */ 1770 while (--savecol >= 0) 1771 (void)ttyoutput('\b', tp); 1772 break; 1773 default: /* XXX */ 1774#define PANICSTR "ttyrub: would panic c = %d, val = %d\n" 1775 (void)printf(PANICSTR, c, CCLASS(c)); 1776#ifdef notdef 1777 panic(PANICSTR, c, CCLASS(c)); 1778#endif 1779 } 1780 } 1781 } else if (ISSET(tp->t_lflag, ECHOPRT)) { 1782 if (!ISSET(tp->t_state, TS_ERASE)) { 1783 SET(tp->t_state, TS_ERASE); 1784 (void)ttyoutput('\\', tp); 1785 } 1786 ttyecho(c, tp); 1787 } else 1788 ttyecho(tp->t_cc[VERASE], tp); 1789 --tp->t_rocount; 1790} 1791 1792/* 1793 * Back over cnt characters, erasing them. 1794 */ 1795static void 1796ttyrubo(tp, cnt) 1797 register struct tty *tp; 1798 int cnt; 1799{ 1800 1801 while (cnt-- > 0) { 1802 (void)ttyoutput('\b', tp); 1803 (void)ttyoutput(' ', tp); 1804 (void)ttyoutput('\b', tp); 1805 } 1806} 1807 1808/* 1809 * ttyretype -- 1810 * Reprint the rawq line. Note, it is assumed that c_cc has already 1811 * been checked. 1812 */ 1813void 1814ttyretype(tp) 1815 register struct tty *tp; 1816{ 1817 register char *cp; 1818 int s, c; 1819 1820 /* Echo the reprint character. */ 1821 if (tp->t_cc[VREPRINT] != _POSIX_VDISABLE) 1822 ttyecho(tp->t_cc[VREPRINT], tp); 1823 1824 (void)ttyoutput('\n', tp); 1825 1826 /* 1827 * XXX 1828 * FIX: NEXTC IS BROKEN - DOESN'T CHECK QUOTE 1829 * BIT OF FIRST CHAR. 1830 */ 1831 s = spltty(); 1832 for (cp = tp->t_canq.c_cf, c = (cp != NULL ? *cp : 0); 1833 cp != NULL; cp = nextc(&tp->t_canq, cp, &c)) 1834 ttyecho(c, tp); 1835 for (cp = tp->t_rawq.c_cf, c = (cp != NULL ? *cp : 0); 1836 cp != NULL; cp = nextc(&tp->t_rawq, cp, &c)) 1837 ttyecho(c, tp); 1838 CLR(tp->t_state, TS_ERASE); 1839 splx(s); 1840 1841 tp->t_rocount = tp->t_rawq.c_cc; 1842 tp->t_rocol = 0; 1843} 1844 1845/* 1846 * Echo a typed character to the terminal. 1847 */ 1848static void 1849ttyecho(c, tp) 1850 register int c; 1851 register struct tty *tp; 1852{ 1853 1854 if (!ISSET(tp->t_state, TS_CNTTB)) 1855 CLR(tp->t_lflag, FLUSHO); 1856 if ((!ISSET(tp->t_lflag, ECHO) && 1857 (!ISSET(tp->t_lflag, ECHONL) || c == '\n')) || 1858 ISSET(tp->t_lflag, EXTPROC)) 1859 return; 1860 if (ISSET(tp->t_lflag, ECHOCTL) && 1861 ((ISSET(c, TTY_CHARMASK) <= 037 && c != '\t' && c != '\n') || 1862 ISSET(c, TTY_CHARMASK) == 0177)) { 1863 (void)ttyoutput('^', tp); 1864 CLR(c, ~TTY_CHARMASK); 1865 if (c == 0177) 1866 c = '?'; 1867 else 1868 c += 'A' - 1; 1869 } 1870 (void)ttyoutput(c, tp); 1871} 1872 1873/* 1874 * Wake up any readers on a tty. 1875 */ 1876void 1877ttwakeup(tp) 1878 register struct tty *tp; 1879{ 1880 1881 selwakeup(&tp->t_rsel); 1882 if (ISSET(tp->t_state, TS_ASYNC)) 1883 pgsignal(tp->t_pgrp, SIGIO, 1); 1884 wakeup((caddr_t)&tp->t_rawq); 1885} 1886 1887/* 1888 * Look up a code for a specified speed in a conversion table; 1889 * used by drivers to map software speed values to hardware parameters. 1890 */ 1891int 1892ttspeedtab(speed, table) 1893 int speed; 1894 register struct speedtab *table; 1895{ 1896 1897 for ( ; table->sp_speed != -1; table++) 1898 if (table->sp_speed == speed) 1899 return (table->sp_code); 1900 return (-1); 1901} 1902 1903/* 1904 * Set tty hi and low water marks. 1905 * 1906 * Try to arrange the dynamics so there's about one second 1907 * from hi to low water. 1908 * 1909 */ 1910void 1911ttsetwater(tp) 1912 struct tty *tp; 1913{ 1914 register int cps, x; 1915 1916#define CLAMP(x, h, l) ((x) > h ? h : ((x) < l) ? l : (x)) 1917 1918 cps = tp->t_ospeed / 10; 1919 tp->t_lowat = x = CLAMP(cps / 2, TTMAXLOWAT, TTMINLOWAT); 1920 x += cps; 1921 x = CLAMP(x, TTMAXHIWAT, TTMINHIWAT); 1922 tp->t_hiwat = roundup(x, CBSIZE); 1923#undef CLAMP 1924} 1925 1926/* 1927 * Report on state of foreground process group. 1928 */ 1929void 1930ttyinfo(tp) 1931 register struct tty *tp; 1932{ 1933 register struct proc *p, *pick; 1934 struct timeval utime, stime; 1935 int tmp; 1936 1937 if (ttycheckoutq(tp,0) == 0) 1938 return; 1939 1940 /* Print load average. */ 1941 tmp = (averunnable.ldavg[0] * 100 + FSCALE / 2) >> FSHIFT; 1942 ttyprintf(tp, "load: %d.%02d ", tmp / 100, tmp % 100); 1943 1944 if (tp->t_session == NULL) 1945 ttyprintf(tp, "not a controlling terminal\n"); 1946 else if (tp->t_pgrp == NULL) 1947 ttyprintf(tp, "no foreground process group\n"); 1948 else if ((p = tp->t_pgrp->pg_mem) == NULL) 1949 ttyprintf(tp, "empty foreground process group\n"); 1950 else { 1951 /* Pick interesting process. */ 1952 for (pick = NULL; p != NULL; p = p->p_pgrpnxt) 1953 if (proc_compare(pick, p)) 1954 pick = p; 1955 1956 ttyprintf(tp, " cmd: %s %d [%s] ", pick->p_comm, pick->p_pid, 1957 pick->p_stat == SRUN ? "running" : 1958 pick->p_wmesg ? pick->p_wmesg : "iowait"); 1959 1960 calcru(pick, &utime, &stime, NULL); 1961 1962 /* Print user time. */ 1963 ttyprintf(tp, "%d.%02du ", 1964 utime.tv_sec, utime.tv_usec / 10000); 1965 1966 /* Print system time. */ 1967 ttyprintf(tp, "%d.%02ds ", 1968 stime.tv_sec, stime.tv_usec / 10000); 1969 1970#define pgtok(a) (((a) * NBPG) / 1024) 1971 /* Print percentage cpu, resident set size. */ 1972 tmp = (pick->p_pctcpu * 10000 + FSCALE / 2) >> FSHIFT; 1973 ttyprintf(tp, "%d%% %dk\n", 1974 tmp / 100, 1975 pick->p_stat == SIDL || pick->p_stat == SZOMB ? 0 : 1976#ifdef pmap_resident_count 1977 pgtok(pmap_resident_count(&pick->p_vmspace->vm_pmap)) 1978#else 1979 pgtok(pick->p_vmspace->vm_rssize) 1980#endif 1981 ); 1982 } 1983 tp->t_rocount = 0; /* so pending input will be retyped if BS */ 1984} 1985 1986/* 1987 * Returns 1 if p2 is "better" than p1 1988 * 1989 * The algorithm for picking the "interesting" process is thus: 1990 * 1991 * 1) Only foreground processes are eligible - implied. 1992 * 2) Runnable processes are favored over anything else. The runner 1993 * with the highest cpu utilization is picked (p_estcpu). Ties are 1994 * broken by picking the highest pid. 1995 * 3) The sleeper with the shortest sleep time is next. With ties, 1996 * we pick out just "short-term" sleepers (P_SINTR == 0). 1997 * 4) Further ties are broken by picking the highest pid. 1998 */ 1999#define ISRUN(p) (((p)->p_stat == SRUN) || ((p)->p_stat == SIDL)) 2000#define TESTAB(a, b) ((a)<<1 | (b)) 2001#define ONLYA 2 2002#define ONLYB 1 2003#define BOTH 3 2004 2005static int 2006proc_compare(p1, p2) 2007 register struct proc *p1, *p2; 2008{ 2009 2010 if (p1 == NULL) 2011 return (1); 2012 /* 2013 * see if at least one of them is runnable 2014 */ 2015 switch (TESTAB(ISRUN(p1), ISRUN(p2))) { 2016 case ONLYA: 2017 return (0); 2018 case ONLYB: 2019 return (1); 2020 case BOTH: 2021 /* 2022 * tie - favor one with highest recent cpu utilization 2023 */ 2024 if (p2->p_estcpu > p1->p_estcpu) 2025 return (1); 2026 if (p1->p_estcpu > p2->p_estcpu) 2027 return (0); 2028 return (p2->p_pid > p1->p_pid); /* tie - return highest pid */ 2029 } 2030 /* 2031 * weed out zombies 2032 */ 2033 switch (TESTAB(p1->p_stat == SZOMB, p2->p_stat == SZOMB)) { 2034 case ONLYA: 2035 return (1); 2036 case ONLYB: 2037 return (0); 2038 case BOTH: 2039 return (p2->p_pid > p1->p_pid); /* tie - return highest pid */ 2040 } 2041 /* 2042 * pick the one with the smallest sleep time 2043 */ 2044 if (p2->p_slptime > p1->p_slptime) 2045 return (0); 2046 if (p1->p_slptime > p2->p_slptime) 2047 return (1); 2048 /* 2049 * favor one sleeping in a non-interruptible sleep 2050 */ 2051 if (p1->p_flag & P_SINTR && (p2->p_flag & P_SINTR) == 0) 2052 return (1); 2053 if (p2->p_flag & P_SINTR && (p1->p_flag & P_SINTR) == 0) 2054 return (0); 2055 return (p2->p_pid > p1->p_pid); /* tie - return highest pid */ 2056} 2057 2058/* 2059 * Output char to tty; console putchar style. 2060 */ 2061int 2062tputchar(c, tp) 2063 int c; 2064 struct tty *tp; 2065{ 2066 register int s; 2067 2068 s = spltty(); 2069 if (ISSET(tp->t_state, 2070 TS_CARR_ON | TS_ISOPEN) != (TS_CARR_ON | TS_ISOPEN)) { 2071 splx(s); 2072 return (-1); 2073 } 2074 if (c == '\n') 2075 (void)ttyoutput('\r', tp); 2076 (void)ttyoutput(c, tp); 2077 ttstart(tp); 2078 splx(s); 2079 return (0); 2080} 2081 2082/* 2083 * Sleep on chan, returning ERESTART if tty changed while we napped and 2084 * returning any errors (e.g. EINTR/ETIMEDOUT) reported by tsleep. If 2085 * the tty is revoked, restarting a pending call will redo validation done 2086 * at the start of the call. 2087 */ 2088int 2089ttysleep(tp, chan, pri, wmesg, timo) 2090 struct tty *tp; 2091 void *chan; 2092 int pri, timo; 2093 char *wmesg; 2094{ 2095 int error; 2096 short gen; 2097 2098 gen = tp->t_gen; 2099 error = tsleep(chan, pri, wmesg, timo); 2100 if (error) 2101 return (error); 2102 return (tp->t_gen == gen ? 0 : ERESTART); 2103} 2104 2105/* 2106 * Allocate a tty structure and its associated buffers. 2107 */ 2108struct tty * 2109ttymalloc() 2110{ 2111 struct tty *tp; 2112 2113 MALLOC(tp, struct tty *, sizeof(struct tty), M_TTYS, M_WAITOK); 2114 bzero(tp, sizeof *tp); 2115 2116 /* 2117 * Initialize or restore a cblock allocation policy suitable for 2118 * the standard line discipline. 2119 */ 2120 clist_alloc_cblocks(&tp->t_canq, TTYHOG, 512); 2121 clist_alloc_cblocks(&tp->t_outq, TTMAXHIWAT + 200, 512); 2122 clist_alloc_cblocks(&tp->t_rawq, TTYHOG, 512); 2123 2124 return(tp); 2125} 2126 2127/* 2128 * Free a tty structure and its buffers. 2129 */ 2130void 2131ttyfree(tp) 2132struct tty *tp; 2133{ 2134 clist_free_cblocks(&tp->t_canq); 2135 clist_free_cblocks(&tp->t_outq); 2136 clist_free_cblocks(&tp->t_rawq); 2137 FREE(tp, M_TTYS); 2138} 2139 2140