tty.c revision 1.296
1 /* $NetBSD: tty.c,v 1.296 2021/09/26 01:16:10 thorpej Exp $ */ 2 3 /*- 4 * Copyright (c) 2008, 2020 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 17 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 18 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 19 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 20 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 26 * POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 /*- 30 * Copyright (c) 1982, 1986, 1990, 1991, 1993 31 * The Regents of the University of California. All rights reserved. 32 * (c) UNIX System Laboratories, Inc. 33 * All or some portions of this file are derived from material licensed 34 * to the University of California by American Telephone and Telegraph 35 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 36 * the permission of UNIX System Laboratories, Inc. 37 * 38 * Redistribution and use in source and binary forms, with or without 39 * modification, are permitted provided that the following conditions 40 * are met: 41 * 1. Redistributions of source code must retain the above copyright 42 * notice, this list of conditions and the following disclaimer. 43 * 2. Redistributions in binary form must reproduce the above copyright 44 * notice, this list of conditions and the following disclaimer in the 45 * documentation and/or other materials provided with the distribution. 46 * 3. Neither the name of the University nor the names of its contributors 47 * may be used to endorse or promote products derived from this software 48 * without specific prior written permission. 49 * 50 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 51 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 52 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 53 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 54 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 55 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 56 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 57 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 58 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 59 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 60 * SUCH DAMAGE. 61 * 62 * @(#)tty.c 8.13 (Berkeley) 1/9/95 63 */ 64 65 #include <sys/cdefs.h> 66 __KERNEL_RCSID(0, "$NetBSD: tty.c,v 1.296 2021/09/26 01:16:10 thorpej Exp $"); 67 68 #ifdef _KERNEL_OPT 69 #include "opt_compat_netbsd.h" 70 #endif 71 72 #define TTY_ALLOW_PRIVATE 73 74 #include <sys/param.h> 75 #include <sys/systm.h> 76 #include <sys/ioctl.h> 77 #include <sys/proc.h> 78 #define TTYDEFCHARS 79 #include <sys/tty.h> 80 #undef TTYDEFCHARS 81 #include <sys/file.h> 82 #include <sys/conf.h> 83 #include <sys/cpu.h> 84 #include <sys/dkstat.h> 85 #include <sys/uio.h> 86 #include <sys/kernel.h> 87 #include <sys/vnode.h> 88 #include <sys/syslog.h> 89 #include <sys/kmem.h> 90 #include <sys/signalvar.h> 91 #include <sys/resourcevar.h> 92 #include <sys/poll.h> 93 #include <sys/kprintf.h> 94 #include <sys/namei.h> 95 #include <sys/sysctl.h> 96 #include <sys/kauth.h> 97 #include <sys/intr.h> 98 #include <sys/ioctl_compat.h> 99 #include <sys/module.h> 100 #include <sys/bitops.h> 101 #include <sys/compat_stub.h> 102 103 #ifdef COMPAT_60 104 #include <compat/sys/ttycom.h> 105 #endif /* COMPAT_60 */ 106 107 static int ttnread(struct tty *); 108 static void ttyblock(struct tty *); 109 static void ttyecho(int, struct tty *); 110 static void ttyrubo(struct tty *, int); 111 static void ttyprintf_nolock(struct tty *, const char *fmt, ...) 112 __printflike(2, 3); 113 static int proc_compare_wrapper(struct proc *, struct proc *); 114 static void ttysigintr(void *); 115 116 /* Symbolic sleep message strings. */ 117 const char ttclos[] = "ttycls"; 118 const char ttopen[] = "ttyopn"; 119 const char ttybg[] = "ttybg"; 120 const char ttyin[] = "ttyin"; 121 const char ttyout[] = "ttyout"; 122 123 /* 124 * Used to determine whether we still have a connection. This is true in 125 * one of 3 cases: 126 * 1) We have carrier. 127 * 2) It's a locally attached terminal, and we are therefore ignoring carrier. 128 * 3) We're using a flow control mechanism that overloads the carrier signal. 129 */ 130 #define CONNECTED(tp) (ISSET(tp->t_state, TS_CARR_ON) || \ 131 ISSET(tp->t_cflag, CLOCAL | MDMBUF)) 132 133 /* 134 * Table with character classes and parity. The 8th bit indicates parity, 135 * the 7th bit indicates the character is an alphameric or underscore (for 136 * ALTWERASE), and the low 6 bits indicate delay type. If the low 6 bits 137 * are 0 then the character needs no special processing on output; classes 138 * other than 0 might be translated or (not currently) require delays. 139 */ 140 #define E 0x00 /* Even parity. */ 141 #define O 0x80 /* Odd parity. */ 142 #define PARITY(c) (char_type[c] & O) 143 144 #define ALPHA 0x40 /* Alpha or underscore. */ 145 #define ISALPHA(c) (char_type[(c) & TTY_CHARMASK] & ALPHA) 146 147 #define CCLASSMASK 0x3f 148 #define CCLASS(c) (char_type[c] & CCLASSMASK) 149 150 #define BS BACKSPACE 151 #define CC CONTROL 152 #define CR RETURN 153 #define NA ORDINARY | ALPHA 154 #define NL NEWLINE 155 #define NO ORDINARY 156 #define TB TAB 157 #define VT VTAB 158 159 unsigned char const char_type[] = { 160 E|CC, O|CC, O|CC, E|CC, O|CC, E|CC, E|CC, O|CC, /* nul - bel */ 161 O|BS, E|TB, E|NL, O|CC, E|VT, O|CR, O|CC, E|CC, /* bs - si */ 162 O|CC, E|CC, E|CC, O|CC, E|CC, O|CC, O|CC, E|CC, /* dle - etb */ 163 E|CC, O|CC, O|CC, E|CC, O|CC, E|CC, E|CC, O|CC, /* can - us */ 164 O|NO, E|NO, E|NO, O|NO, E|NO, O|NO, O|NO, E|NO, /* sp - ' */ 165 E|NO, O|NO, O|NO, E|NO, O|NO, E|NO, E|NO, O|NO, /* ( - / */ 166 E|NA, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* 0 - 7 */ 167 O|NA, E|NA, E|NO, O|NO, E|NO, O|NO, O|NO, E|NO, /* 8 - ? */ 168 O|NO, E|NA, E|NA, O|NA, E|NA, O|NA, O|NA, E|NA, /* @ - G */ 169 E|NA, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* H - O */ 170 E|NA, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* P - W */ 171 O|NA, E|NA, E|NA, O|NO, E|NO, O|NO, O|NO, O|NA, /* X - _ */ 172 E|NO, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* ` - g */ 173 O|NA, E|NA, E|NA, O|NA, E|NA, O|NA, O|NA, E|NA, /* h - o */ 174 O|NA, E|NA, E|NA, O|NA, E|NA, O|NA, O|NA, E|NA, /* p - w */ 175 E|NA, O|NA, O|NA, E|NO, O|NO, E|NO, E|NO, O|CC, /* x - del */ 176 /* 177 * Meta chars; should be settable per character set; 178 * for now, treat them all as normal characters. 179 */ 180 NA, NA, NA, NA, NA, NA, NA, NA, 181 NA, NA, NA, NA, NA, NA, NA, NA, 182 NA, NA, NA, NA, NA, NA, NA, NA, 183 NA, NA, NA, NA, NA, NA, NA, NA, 184 NA, NA, NA, NA, NA, NA, NA, NA, 185 NA, NA, NA, NA, NA, NA, NA, NA, 186 NA, NA, NA, NA, NA, NA, NA, NA, 187 NA, NA, NA, NA, NA, NA, NA, NA, 188 NA, NA, NA, NA, NA, NA, NA, NA, 189 NA, NA, NA, NA, NA, NA, NA, NA, 190 NA, NA, NA, NA, NA, NA, NA, NA, 191 NA, NA, NA, NA, NA, NA, NA, NA, 192 NA, NA, NA, NA, NA, NA, NA, NA, 193 NA, NA, NA, NA, NA, NA, NA, NA, 194 NA, NA, NA, NA, NA, NA, NA, NA, 195 NA, NA, NA, NA, NA, NA, NA, NA, 196 }; 197 #undef BS 198 #undef CC 199 #undef CR 200 #undef NA 201 #undef NL 202 #undef NO 203 #undef TB 204 #undef VT 205 206 static struct ttylist_head tty_sigqueue = TAILQ_HEAD_INITIALIZER(tty_sigqueue); 207 static void *tty_sigsih; 208 209 struct ttylist_head ttylist = TAILQ_HEAD_INITIALIZER(ttylist); 210 int tty_count; 211 kmutex_t tty_lock; 212 213 struct ptm_pty *ptm = NULL; 214 215 uint64_t tk_cancc; 216 uint64_t tk_nin; 217 uint64_t tk_nout; 218 uint64_t tk_rawcc; 219 220 static kauth_listener_t tty_listener; 221 222 #define TTY_MINQSIZE 0x00400 223 #define TTY_MAXQSIZE 0x10000 224 int tty_qsize = TTY_MINQSIZE; 225 226 static int 227 tty_get_qsize(int *qsize, int newsize) 228 { 229 if (newsize <= 0) 230 return EINVAL; 231 232 newsize = 1 << ilog2(newsize); /* Make it a power of two */ 233 234 if (newsize < TTY_MINQSIZE || newsize > TTY_MAXQSIZE) 235 return EINVAL; 236 237 *qsize = newsize; 238 return 0; 239 } 240 241 static int 242 tty_set_qsize(struct tty *tp, int newsize) 243 { 244 struct clist rawq, canq, outq; 245 struct clist orawq, ocanq, ooutq; 246 247 clalloc(&rawq, newsize, 1); 248 clalloc(&canq, newsize, 1); 249 clalloc(&outq, newsize, 0); 250 251 mutex_spin_enter(&tty_lock); 252 253 if (tp->t_outq.c_cc != 0) { 254 mutex_spin_exit(&tty_lock); 255 clfree(&rawq); 256 clfree(&canq); 257 clfree(&outq); 258 return EBUSY; 259 } 260 261 orawq = tp->t_rawq; 262 ocanq = tp->t_canq; 263 ooutq = tp->t_outq; 264 265 tp->t_qsize = newsize; 266 tp->t_rawq = rawq; 267 tp->t_canq = canq; 268 tp->t_outq = outq; 269 270 ttsetwater(tp); 271 272 mutex_spin_exit(&tty_lock); 273 274 clfree(&orawq); 275 clfree(&ocanq); 276 clfree(&ooutq); 277 278 return 0; 279 } 280 281 static int 282 sysctl_kern_tty_qsize(SYSCTLFN_ARGS) 283 { 284 int newsize; 285 int error; 286 struct sysctlnode node; 287 node = *rnode; 288 node.sysctl_data = &newsize; 289 290 newsize = tty_qsize; 291 error = sysctl_lookup(SYSCTLFN_CALL(&node)); 292 if (error || newp == NULL) 293 return error; 294 295 296 return tty_get_qsize(&tty_qsize, newsize); 297 } 298 299 static void 300 sysctl_kern_tty_setup(void) 301 { 302 const struct sysctlnode *rnode, *cnode; 303 304 sysctl_createv(NULL, 0, NULL, NULL, 305 CTLFLAG_PERMANENT, 306 CTLTYPE_NODE, "tkstat", 307 SYSCTL_DESCR("Number of characters sent and received " 308 "on ttys"), 309 NULL, 0, NULL, 0, 310 CTL_KERN, KERN_TKSTAT, CTL_EOL); 311 312 sysctl_createv(NULL, 0, NULL, NULL, 313 CTLFLAG_PERMANENT, 314 CTLTYPE_QUAD, "nin", 315 SYSCTL_DESCR("Total number of tty input characters"), 316 NULL, 0, &tk_nin, 0, 317 CTL_KERN, KERN_TKSTAT, KERN_TKSTAT_NIN, CTL_EOL); 318 sysctl_createv(NULL, 0, NULL, NULL, 319 CTLFLAG_PERMANENT, 320 CTLTYPE_QUAD, "nout", 321 SYSCTL_DESCR("Total number of tty output characters"), 322 NULL, 0, &tk_nout, 0, 323 CTL_KERN, KERN_TKSTAT, KERN_TKSTAT_NOUT, CTL_EOL); 324 sysctl_createv(NULL, 0, NULL, NULL, 325 CTLFLAG_PERMANENT, 326 CTLTYPE_QUAD, "cancc", 327 SYSCTL_DESCR("Number of canonical tty input characters"), 328 NULL, 0, &tk_cancc, 0, 329 CTL_KERN, KERN_TKSTAT, KERN_TKSTAT_CANCC, CTL_EOL); 330 sysctl_createv(NULL, 0, NULL, NULL, 331 CTLFLAG_PERMANENT, 332 CTLTYPE_QUAD, "rawcc", 333 SYSCTL_DESCR("Number of raw tty input characters"), 334 NULL, 0, &tk_rawcc, 0, 335 CTL_KERN, KERN_TKSTAT, KERN_TKSTAT_RAWCC, CTL_EOL); 336 337 sysctl_createv(NULL, 0, NULL, &rnode, 338 CTLFLAG_PERMANENT, 339 CTLTYPE_NODE, "tty", NULL, 340 NULL, 0, NULL, 0, 341 CTL_KERN, CTL_CREATE, CTL_EOL); 342 sysctl_createv(NULL, 0, &rnode, &cnode, 343 CTLFLAG_PERMANENT | CTLFLAG_READWRITE, 344 CTLTYPE_INT, "qsize", 345 SYSCTL_DESCR("TTY input and output queue size"), 346 sysctl_kern_tty_qsize, 0, &tty_qsize, 0, 347 CTL_CREATE, CTL_EOL); 348 } 349 350 int 351 ttyopen(struct tty *tp, int dialout, int nonblock) 352 { 353 int error; 354 355 error = 0; 356 357 mutex_spin_enter(&tty_lock); 358 359 if (dialout) { 360 /* 361 * If the device is already open for non-dialout, fail. 362 * Otherwise, set TS_DIALOUT to block any pending non-dialout 363 * opens. 364 */ 365 if (ISSET(tp->t_state, TS_ISOPEN) && 366 !ISSET(tp->t_state, TS_DIALOUT)) { 367 error = EBUSY; 368 goto out; 369 } 370 SET(tp->t_state, TS_DIALOUT); 371 } else { 372 if (!nonblock) { 373 /* 374 * Wait for carrier. Also wait for any dialout 375 * processes to close the tty first. 376 */ 377 while (ISSET(tp->t_state, TS_DIALOUT) || 378 !CONNECTED(tp)) { 379 tp->t_wopen++; 380 error = ttysleep(tp, &tp->t_rawcv, true, 0); 381 tp->t_wopen--; 382 if (error) 383 goto out; 384 } 385 } else { 386 /* 387 * Don't allow a non-blocking non-dialout open if the 388 * device is already open for dialout. 389 */ 390 if (ISSET(tp->t_state, TS_DIALOUT)) { 391 error = EBUSY; 392 goto out; 393 } 394 } 395 } 396 397 out: 398 mutex_spin_exit(&tty_lock); 399 return (error); 400 } 401 402 /* 403 * Initial open of tty, or (re)entry to standard tty line discipline. 404 */ 405 int 406 ttylopen(dev_t device, struct tty *tp) 407 { 408 409 mutex_spin_enter(&tty_lock); 410 tp->t_dev = device; 411 if (!ISSET(tp->t_state, TS_ISOPEN)) { 412 SET(tp->t_state, TS_ISOPEN); 413 memset(&tp->t_winsize, 0, sizeof(tp->t_winsize)); 414 tp->t_flags = 0; 415 } 416 mutex_spin_exit(&tty_lock); 417 if (tp->t_qsize != tty_qsize) 418 tty_set_qsize(tp, tty_qsize); 419 return (0); 420 } 421 422 /* 423 * Handle close() on a tty line: flush and set to initial state, 424 * bumping generation number so that pending read/write calls 425 * can detect recycling of the tty. 426 */ 427 int 428 ttyclose(struct tty *tp) 429 { 430 extern struct tty *constty; /* Temporary virtual console. */ 431 struct session *sess; 432 433 mutex_spin_enter(&tty_lock); 434 435 if (constty == tp) 436 constty = NULL; 437 438 ttyflush(tp, FREAD | FWRITE); 439 440 tp->t_gen++; 441 tp->t_pgrp = NULL; 442 tp->t_state = 0; 443 sess = tp->t_session; 444 tp->t_session = NULL; 445 446 mutex_spin_exit(&tty_lock); 447 448 if (sess != NULL) { 449 mutex_enter(&proc_lock); 450 /* Releases proc_lock. */ 451 proc_sessrele(sess); 452 } 453 return (0); 454 } 455 456 #define FLUSHQ(q) { \ 457 if ((q)->c_cc) \ 458 ndflush(q, (q)->c_cc); \ 459 } 460 461 /* 462 * This macro is used in canonical mode input processing, where a read 463 * request shall not return unless a 'line delimiter' ('\n') or 'break' 464 * (EOF, EOL, EOL2) character (or a signal) has been received. As EOL2 465 * is an extension to the POSIX.1 defined set of special characters, 466 * recognize it only if IEXTEN is set in the set of local flags. 467 */ 468 #define TTBREAKC(c, lflg) \ 469 ((c) == '\n' || (((c) == cc[VEOF] || (c) == cc[VEOL] || \ 470 ((c) == cc[VEOL2] && ISSET(lflg, IEXTEN))) && (c) != _POSIX_VDISABLE)) 471 472 473 474 /* 475 * ttyinput() helper. 476 * Call with the tty lock held. 477 */ 478 /* XXX static */ int 479 ttyinput_wlock(int c, struct tty *tp) 480 { 481 int iflag, lflag, i, error; 482 u_char *cc; 483 484 KASSERT(mutex_owned(&tty_lock)); 485 486 /* 487 * If input is pending take it first. 488 */ 489 lflag = tp->t_lflag; 490 if (ISSET(lflag, PENDIN)) 491 ttypend(tp); 492 /* 493 * Gather stats. 494 */ 495 if (ISSET(lflag, ICANON)) { 496 ++tk_cancc; 497 ++tp->t_cancc; 498 } else { 499 ++tk_rawcc; 500 ++tp->t_rawcc; 501 } 502 ++tk_nin; 503 504 cc = tp->t_cc; 505 506 /* 507 * Handle exceptional conditions (break, parity, framing). 508 */ 509 iflag = tp->t_iflag; 510 if ((error = (ISSET(c, TTY_ERRORMASK))) != 0) { 511 CLR(c, TTY_ERRORMASK); 512 if (ISSET(error, TTY_FE) && c == 0) { /* Break. */ 513 if (ISSET(iflag, IGNBRK)) 514 return (0); 515 else if (ISSET(iflag, BRKINT)) { 516 ttyflush(tp, FREAD | FWRITE); 517 ttysig(tp, TTYSIG_PG1, SIGINT); 518 return (0); 519 } else if (ISSET(iflag, PARMRK)) 520 goto parmrk; 521 } else if ((ISSET(error, TTY_PE) && ISSET(iflag, INPCK)) || 522 ISSET(error, TTY_FE)) { 523 if (ISSET(iflag, IGNPAR)) 524 return (0); 525 else if (ISSET(iflag, PARMRK)) { 526 parmrk: (void)putc(0377 | TTY_QUOTE, &tp->t_rawq); 527 (void)putc(0 | TTY_QUOTE, &tp->t_rawq); 528 (void)putc(c | TTY_QUOTE, &tp->t_rawq); 529 return (0); 530 } else 531 c = 0; 532 } 533 } else if (c == 0377 && 534 ISSET(iflag, ISTRIP|IGNPAR|INPCK|PARMRK) == (INPCK|PARMRK)) { 535 /* "Escape" a valid character of '\377'. */ 536 (void)putc(0377 | TTY_QUOTE, &tp->t_rawq); 537 (void)putc(0377 | TTY_QUOTE, &tp->t_rawq); 538 goto endcase; 539 } 540 541 /* 542 * In tandem mode, check high water mark. 543 */ 544 if (ISSET(iflag, IXOFF) || ISSET(tp->t_cflag, CHWFLOW)) 545 ttyblock(tp); 546 if (!ISSET(tp->t_state, TS_TYPEN) && ISSET(iflag, ISTRIP)) 547 CLR(c, 0x80); 548 if (!ISSET(lflag, EXTPROC)) { 549 /* 550 * Check for literal nexting very first 551 */ 552 if (ISSET(tp->t_state, TS_LNCH)) { 553 SET(c, TTY_QUOTE); 554 CLR(tp->t_state, TS_LNCH); 555 } 556 /* 557 * Scan for special characters. This code 558 * is really just a big case statement with 559 * non-constant cases. The bottom of the 560 * case statement is labeled ``endcase'', so goto 561 * it after a case match, or similar. 562 */ 563 564 /* 565 * Control chars which aren't controlled 566 * by ICANON, ISIG, or IXON. 567 */ 568 if (ISSET(lflag, IEXTEN)) { 569 if (CCEQ(cc[VLNEXT], c)) { 570 if (ISSET(lflag, ECHO)) { 571 if (ISSET(lflag, ECHOE)) { 572 (void)ttyoutput('^', tp); 573 (void)ttyoutput('\b', tp); 574 } else 575 ttyecho(c, tp); 576 } 577 SET(tp->t_state, TS_LNCH); 578 goto endcase; 579 } 580 if (CCEQ(cc[VDISCARD], c)) { 581 if (ISSET(lflag, FLUSHO)) 582 CLR(tp->t_lflag, FLUSHO); 583 else { 584 ttyflush(tp, FWRITE); 585 ttyecho(c, tp); 586 if (tp->t_rawq.c_cc + tp->t_canq.c_cc) 587 ttyretype(tp); 588 SET(tp->t_lflag, FLUSHO); 589 } 590 goto startoutput; 591 } 592 } 593 /* 594 * Signals. 595 */ 596 if (ISSET(lflag, ISIG)) { 597 if (CCEQ(cc[VINTR], c) || CCEQ(cc[VQUIT], c)) { 598 if (!ISSET(lflag, NOFLSH)) 599 ttyflush(tp, FREAD | FWRITE); 600 ttyecho(c, tp); 601 ttysig(tp, TTYSIG_PG1, CCEQ(cc[VINTR], c) ? 602 SIGINT : SIGQUIT); 603 goto endcase; 604 } 605 if (CCEQ(cc[VSUSP], c)) { 606 if (!ISSET(lflag, NOFLSH)) 607 ttyflush(tp, FREAD); 608 ttyecho(c, tp); 609 ttysig(tp, TTYSIG_PG1, SIGTSTP); 610 goto endcase; 611 } 612 } 613 /* 614 * Handle start/stop characters. 615 */ 616 if (ISSET(iflag, IXON)) { 617 if (CCEQ(cc[VSTOP], c)) { 618 if (!ISSET(tp->t_state, TS_TTSTOP)) { 619 SET(tp->t_state, TS_TTSTOP); 620 cdev_stop(tp, 0); 621 return (0); 622 } 623 if (!CCEQ(cc[VSTART], c)) 624 return (0); 625 /* 626 * if VSTART == VSTOP then toggle 627 */ 628 goto endcase; 629 } 630 if (CCEQ(cc[VSTART], c)) 631 goto restartoutput; 632 } 633 /* 634 * IGNCR, ICRNL, & INLCR 635 */ 636 if (c == '\r') { 637 if (ISSET(iflag, IGNCR)) 638 goto endcase; 639 else if (ISSET(iflag, ICRNL)) 640 c = '\n'; 641 } else if (c == '\n' && ISSET(iflag, INLCR)) 642 c = '\r'; 643 } 644 if (!ISSET(lflag, EXTPROC) && ISSET(lflag, ICANON)) { 645 /* 646 * From here on down canonical mode character 647 * processing takes place. 648 */ 649 /* 650 * erase (^H / ^?) 651 */ 652 if (CCEQ(cc[VERASE], c)) { 653 if (tp->t_rawq.c_cc) 654 ttyrub(unputc(&tp->t_rawq), tp); 655 goto endcase; 656 } 657 /* 658 * kill (^U) 659 */ 660 if (CCEQ(cc[VKILL], c)) { 661 if (ISSET(lflag, ECHOKE) && 662 tp->t_rawq.c_cc == tp->t_rocount && 663 !ISSET(lflag, ECHOPRT)) 664 while (tp->t_rawq.c_cc) 665 ttyrub(unputc(&tp->t_rawq), tp); 666 else { 667 ttyecho(c, tp); 668 if (ISSET(lflag, ECHOK) || 669 ISSET(lflag, ECHOKE)) 670 ttyecho('\n', tp); 671 FLUSHQ(&tp->t_rawq); 672 tp->t_rocount = 0; 673 } 674 CLR(tp->t_state, TS_LOCAL); 675 goto endcase; 676 } 677 /* 678 * Extensions to the POSIX.1 GTI set of functions. 679 */ 680 if (ISSET(lflag, IEXTEN)) { 681 /* 682 * word erase (^W) 683 */ 684 if (CCEQ(cc[VWERASE], c)) { 685 int alt = ISSET(lflag, ALTWERASE); 686 int ctype; 687 688 /* 689 * erase whitespace 690 */ 691 while ((c = unputc(&tp->t_rawq)) == ' ' || 692 c == '\t') 693 ttyrub(c, tp); 694 if (c == -1) 695 goto endcase; 696 /* 697 * erase last char of word and remember the 698 * next chars type (for ALTWERASE) 699 */ 700 ttyrub(c, tp); 701 c = unputc(&tp->t_rawq); 702 if (c == -1) 703 goto endcase; 704 if (c == ' ' || c == '\t') { 705 (void)putc(c, &tp->t_rawq); 706 goto endcase; 707 } 708 ctype = ISALPHA(c); 709 /* 710 * erase rest of word 711 */ 712 do { 713 ttyrub(c, tp); 714 c = unputc(&tp->t_rawq); 715 if (c == -1) 716 goto endcase; 717 } while (c != ' ' && c != '\t' && 718 (alt == 0 || ISALPHA(c) == ctype)); 719 (void)putc(c, &tp->t_rawq); 720 goto endcase; 721 } 722 /* 723 * reprint line (^R) 724 */ 725 if (CCEQ(cc[VREPRINT], c)) { 726 ttyretype(tp); 727 goto endcase; 728 } 729 /* 730 * ^T - kernel info and generate SIGINFO 731 */ 732 if (CCEQ(cc[VSTATUS], c)) { 733 ttysig(tp, TTYSIG_PG1, SIGINFO); 734 goto endcase; 735 } 736 } 737 } 738 /* 739 * Check for input buffer overflow 740 */ 741 if (tp->t_rawq.c_cc + tp->t_canq.c_cc >= TTYHOG) { 742 if (ISSET(iflag, IMAXBEL)) { 743 if (tp->t_outq.c_cc < tp->t_hiwat) 744 (void)ttyoutput(CTRL('g'), tp); 745 } else 746 ttyflush(tp, FREAD | FWRITE); 747 goto endcase; 748 } 749 /* 750 * Put data char in q for user and 751 * wakeup on seeing a line delimiter. 752 */ 753 if (putc(c, &tp->t_rawq) >= 0) { 754 if (!ISSET(lflag, ICANON)) { 755 ttwakeup(tp); 756 ttyecho(c, tp); 757 goto endcase; 758 } 759 if (TTBREAKC(c, lflag)) { 760 tp->t_rocount = 0; 761 catq(&tp->t_rawq, &tp->t_canq); 762 ttwakeup(tp); 763 } else if (tp->t_rocount++ == 0) 764 tp->t_rocol = tp->t_column; 765 if (ISSET(tp->t_state, TS_ERASE)) { 766 /* 767 * end of prterase \.../ 768 */ 769 CLR(tp->t_state, TS_ERASE); 770 (void)ttyoutput('/', tp); 771 } 772 i = tp->t_column; 773 ttyecho(c, tp); 774 if (CCEQ(cc[VEOF], c) && ISSET(lflag, ECHO)) { 775 /* 776 * Place the cursor over the '^' of the ^D. 777 */ 778 i = uimin(2, tp->t_column - i); 779 while (i > 0) { 780 (void)ttyoutput('\b', tp); 781 i--; 782 } 783 } 784 } 785 endcase: 786 /* 787 * IXANY means allow any character to restart output. 788 */ 789 if (ISSET(tp->t_state, TS_TTSTOP) && 790 !ISSET(iflag, IXANY) && cc[VSTART] != cc[VSTOP]) { 791 return (0); 792 } 793 restartoutput: 794 CLR(tp->t_lflag, FLUSHO); 795 CLR(tp->t_state, TS_TTSTOP); 796 startoutput: 797 return (ttstart(tp)); 798 } 799 800 /* 801 * Process input of a single character received on a tty. 802 * 803 * XXX - this is a hack, all drivers must changed to acquire the 804 * lock before calling linesw->l_rint() 805 */ 806 int 807 ttyinput(int c, struct tty *tp) 808 { 809 int error; 810 811 /* 812 * Unless the receiver is enabled, drop incoming data. 813 */ 814 if (!ISSET(tp->t_cflag, CREAD)) 815 return (0); 816 817 mutex_spin_enter(&tty_lock); 818 error = ttyinput_wlock(c, tp); 819 mutex_spin_exit(&tty_lock); 820 821 return (error); 822 } 823 824 /* 825 * Output a single character on a tty, doing output processing 826 * as needed (expanding tabs, newline processing, etc.). 827 * Returns < 0 if succeeds, otherwise returns char to resend. 828 * Must be recursive. 829 * 830 * Call with tty lock held. 831 */ 832 int 833 ttyoutput(int c, struct tty *tp) 834 { 835 long oflag; 836 int col, notout; 837 838 KASSERT(mutex_owned(&tty_lock)); 839 840 oflag = tp->t_oflag; 841 if (!ISSET(oflag, OPOST)) { 842 tk_nout++; 843 tp->t_outcc++; 844 if (!ISSET(tp->t_lflag, FLUSHO) && putc(c, &tp->t_outq)) 845 return (c); 846 return (-1); 847 } 848 /* 849 * Do tab expansion if OXTABS is set. Special case if we do external 850 * processing, we don't do the tab expansion because we'll probably 851 * get it wrong. If tab expansion needs to be done, let it happen 852 * externally. 853 */ 854 CLR(c, ~TTY_CHARMASK); 855 if (c == '\t' && 856 ISSET(oflag, OXTABS) && !ISSET(tp->t_lflag, EXTPROC)) { 857 c = 8 - (tp->t_column & 7); 858 if (ISSET(tp->t_lflag, FLUSHO)) { 859 notout = 0; 860 } else { 861 notout = b_to_q(" ", c, &tp->t_outq); 862 c -= notout; 863 tk_nout += c; 864 tp->t_outcc += c; 865 } 866 tp->t_column += c; 867 return (notout ? '\t' : -1); 868 } 869 if (c == CEOT && ISSET(oflag, ONOEOT)) 870 return (-1); 871 872 /* 873 * Newline translation: if ONLCR is set, 874 * translate newline into "\r\n". 875 */ 876 if (c == '\n' && ISSET(tp->t_oflag, ONLCR)) { 877 tk_nout++; 878 tp->t_outcc++; 879 if (!ISSET(tp->t_lflag, FLUSHO) && putc('\r', &tp->t_outq)) 880 return (c); 881 } 882 /* If OCRNL is set, translate "\r" into "\n". */ 883 else if (c == '\r' && ISSET(tp->t_oflag, OCRNL)) 884 c = '\n'; 885 /* If ONOCR is set, don't transmit CRs when on column 0. */ 886 else if (c == '\r' && ISSET(tp->t_oflag, ONOCR) && tp->t_column == 0) 887 return (-1); 888 889 tk_nout++; 890 tp->t_outcc++; 891 if (!ISSET(tp->t_lflag, FLUSHO) && putc(c, &tp->t_outq)) 892 return (c); 893 894 col = tp->t_column; 895 switch (CCLASS(c)) { 896 case BACKSPACE: 897 if (col > 0) 898 --col; 899 break; 900 case CONTROL: 901 break; 902 case NEWLINE: 903 if (ISSET(tp->t_oflag, ONLCR | ONLRET)) 904 col = 0; 905 break; 906 case RETURN: 907 col = 0; 908 break; 909 case ORDINARY: 910 ++col; 911 break; 912 case TAB: 913 col = (col + 8) & ~7; 914 break; 915 } 916 tp->t_column = col; 917 return (-1); 918 } 919 920 /* 921 * Ioctls for all tty devices. Called after line-discipline specific ioctl 922 * has been called to do discipline-specific functions and/or reject any 923 * of these ioctl commands. 924 */ 925 /* ARGSUSED */ 926 int 927 ttioctl(struct tty *tp, u_long cmd, void *data, int flag, struct lwp *l) 928 { 929 extern struct tty *constty; /* Temporary virtual console. */ 930 struct proc *p; 931 struct linesw *lp; 932 int s, error; 933 struct pathbuf *pb; 934 struct nameidata nd; 935 char infobuf[200]; 936 937 KASSERT(l != NULL); 938 p = l->l_proc; 939 940 /* If the ioctl involves modification, hang if in the background. */ 941 switch (cmd) { 942 case TIOCFLUSH: 943 case TIOCDRAIN: 944 case TIOCSBRK: 945 case TIOCCBRK: 946 case TIOCSTART: 947 case TIOCSETA: 948 case TIOCSETD: 949 case TIOCSLINED: 950 case TIOCSETAF: 951 case TIOCSETAW: 952 #ifdef notdef 953 case TIOCSPGRP: 954 case FIOSETOWN: 955 #endif 956 case TIOCSTAT: 957 case TIOCSTI: 958 case TIOCSWINSZ: 959 case TIOCSQSIZE: 960 case TIOCLBIC: 961 case TIOCLBIS: 962 case TIOCLSET: 963 case TIOCSETC: 964 case OTIOCSETD: 965 case TIOCSETN: 966 case TIOCSETP: 967 case TIOCSLTC: 968 mutex_spin_enter(&tty_lock); 969 while (isbackground(curproc, tp) && 970 p->p_pgrp->pg_jobc && (p->p_lflag & PL_PPWAIT) == 0 && 971 !sigismasked(l, SIGTTOU)) { 972 mutex_spin_exit(&tty_lock); 973 974 mutex_enter(&proc_lock); 975 pgsignal(p->p_pgrp, SIGTTOU, 1); 976 mutex_exit(&proc_lock); 977 978 mutex_spin_enter(&tty_lock); 979 error = ttypause(tp, hz); 980 if (error) { 981 mutex_spin_exit(&tty_lock); 982 return (error); 983 } 984 } 985 mutex_spin_exit(&tty_lock); 986 break; 987 } 988 989 switch (cmd) { /* Process the ioctl. */ 990 case FIOASYNC: /* set/clear async i/o */ 991 mutex_spin_enter(&tty_lock); 992 if (*(int *)data) 993 SET(tp->t_state, TS_ASYNC); 994 else 995 CLR(tp->t_state, TS_ASYNC); 996 mutex_spin_exit(&tty_lock); 997 break; 998 case FIONBIO: /* set/clear non-blocking i/o */ 999 break; /* XXX: delete. */ 1000 case FIONREAD: /* get # bytes to read */ 1001 mutex_spin_enter(&tty_lock); 1002 *(int *)data = ttnread(tp); 1003 mutex_spin_exit(&tty_lock); 1004 break; 1005 case FIONWRITE: /* get # bytes to written & unsent */ 1006 mutex_spin_enter(&tty_lock); 1007 *(int *)data = tp->t_outq.c_cc; 1008 mutex_spin_exit(&tty_lock); 1009 break; 1010 case FIONSPACE: /* get # bytes to written & unsent */ 1011 mutex_spin_enter(&tty_lock); 1012 *(int *)data = tp->t_outq.c_cn - tp->t_outq.c_cc; 1013 mutex_spin_exit(&tty_lock); 1014 break; 1015 case TIOCEXCL: /* set exclusive use of tty */ 1016 mutex_spin_enter(&tty_lock); 1017 SET(tp->t_state, TS_XCLUDE); 1018 mutex_spin_exit(&tty_lock); 1019 break; 1020 case TIOCFLUSH: { /* flush buffers */ 1021 int flags = *(int *)data; 1022 1023 if (flags == 0) 1024 flags = FREAD | FWRITE; 1025 else 1026 flags &= FREAD | FWRITE; 1027 mutex_spin_enter(&tty_lock); 1028 ttyflush(tp, flags); 1029 mutex_spin_exit(&tty_lock); 1030 break; 1031 } 1032 case TIOCCONS: /* become virtual console */ 1033 if (*(int *)data) { 1034 if (constty && constty != tp && 1035 ISSET(constty->t_state, TS_CARR_ON | TS_ISOPEN) == 1036 (TS_CARR_ON | TS_ISOPEN)) 1037 return EBUSY; 1038 1039 pb = pathbuf_create("/dev/console"); 1040 if (pb == NULL) { 1041 return ENOMEM; 1042 } 1043 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, pb); 1044 if ((error = namei(&nd)) != 0) { 1045 pathbuf_destroy(pb); 1046 return error; 1047 } 1048 error = VOP_ACCESS(nd.ni_vp, VREAD, l->l_cred); 1049 vput(nd.ni_vp); 1050 pathbuf_destroy(pb); 1051 if (error) 1052 return error; 1053 1054 constty = tp; 1055 } else if (tp == constty) 1056 constty = NULL; 1057 break; 1058 case TIOCDRAIN: /* wait till output drained */ 1059 if ((error = ttywait(tp)) != 0) 1060 return (error); 1061 break; 1062 case TIOCGETA: { /* get termios struct */ 1063 struct termios *t = (struct termios *)data; 1064 1065 memcpy(t, &tp->t_termios, sizeof(struct termios)); 1066 break; 1067 } 1068 case TIOCGETD: /* get line discipline (old) */ 1069 *(int *)data = tp->t_linesw->l_no; 1070 break; 1071 case TIOCGLINED: /* get line discipline (new) */ 1072 (void)strncpy((char *)data, tp->t_linesw->l_name, 1073 TTLINEDNAMELEN - 1); 1074 break; 1075 case TIOCGWINSZ: /* get window size */ 1076 *(struct winsize *)data = tp->t_winsize; 1077 break; 1078 case TIOCGQSIZE: 1079 *(int *)data = tp->t_qsize; 1080 break; 1081 case FIOGETOWN: 1082 mutex_enter(&proc_lock); 1083 if (tp->t_session != NULL && !isctty(p, tp)) { 1084 mutex_exit(&proc_lock); 1085 return (ENOTTY); 1086 } 1087 *(int *)data = tp->t_pgrp ? -tp->t_pgrp->pg_id : 0; 1088 mutex_exit(&proc_lock); 1089 break; 1090 case TIOCGPGRP: /* get pgrp of tty */ 1091 mutex_enter(&proc_lock); 1092 if (!isctty(p, tp)) { 1093 mutex_exit(&proc_lock); 1094 return (ENOTTY); 1095 } 1096 *(int *)data = tp->t_pgrp ? tp->t_pgrp->pg_id : NO_PGID; 1097 mutex_exit(&proc_lock); 1098 break; 1099 case TIOCGSID: /* get sid of tty */ 1100 mutex_enter(&proc_lock); 1101 if (!isctty(p, tp)) { 1102 mutex_exit(&proc_lock); 1103 return (ENOTTY); 1104 } 1105 *(int *)data = tp->t_session->s_sid; 1106 mutex_exit(&proc_lock); 1107 break; 1108 #ifdef TIOCHPCL 1109 case TIOCHPCL: /* hang up on last close */ 1110 mutex_spin_enter(&tty_lock); 1111 SET(tp->t_cflag, HUPCL); 1112 mutex_spin_exit(&tty_lock); 1113 break; 1114 #endif 1115 case TIOCNXCL: /* reset exclusive use of tty */ 1116 mutex_spin_enter(&tty_lock); 1117 CLR(tp->t_state, TS_XCLUDE); 1118 mutex_spin_exit(&tty_lock); 1119 break; 1120 case TIOCOUTQ: /* output queue size */ 1121 *(int *)data = tp->t_outq.c_cc; 1122 break; 1123 case TIOCSETA: /* set termios struct */ 1124 case TIOCSETAW: /* drain output, set */ 1125 case TIOCSETAF: { /* drn out, fls in, set */ 1126 struct termios *t = (struct termios *)data; 1127 1128 if (cmd == TIOCSETAW || cmd == TIOCSETAF) { 1129 if ((error = ttywait(tp)) != 0) 1130 return (error); 1131 1132 if (cmd == TIOCSETAF) { 1133 mutex_spin_enter(&tty_lock); 1134 ttyflush(tp, FREAD); 1135 mutex_spin_exit(&tty_lock); 1136 } 1137 } 1138 1139 s = spltty(); 1140 /* 1141 * XXXSMP - some drivers call back on us from t_param(), so 1142 * don't take the tty spin lock here. 1143 * require t_param() to unlock upon callback? 1144 */ 1145 /* wanted here: mutex_spin_enter(&tty_lock); */ 1146 if (!ISSET(t->c_cflag, CIGNORE)) { 1147 /* 1148 * Set device hardware. 1149 */ 1150 if (tp->t_param && (error = (*tp->t_param)(tp, t))) { 1151 /* wanted here: mutex_spin_exit(&tty_lock); */ 1152 splx(s); 1153 return (error); 1154 } else { 1155 tp->t_cflag = t->c_cflag; 1156 tp->t_ispeed = t->c_ispeed; 1157 tp->t_ospeed = t->c_ospeed; 1158 if (t->c_ospeed == 0) 1159 ttysig(tp, TTYSIG_LEADER, SIGHUP); 1160 } 1161 ttsetwater(tp); 1162 } 1163 1164 /* delayed lock acquiring */ 1165 mutex_spin_enter(&tty_lock); 1166 if (cmd != TIOCSETAF) { 1167 if (ISSET(t->c_lflag, ICANON) != 1168 ISSET(tp->t_lflag, ICANON)) { 1169 if (ISSET(t->c_lflag, ICANON)) { 1170 SET(tp->t_lflag, PENDIN); 1171 ttwakeup(tp); 1172 } else { 1173 struct clist tq; 1174 1175 catq(&tp->t_rawq, &tp->t_canq); 1176 tq = tp->t_rawq; 1177 tp->t_rawq = tp->t_canq; 1178 tp->t_canq = tq; 1179 CLR(tp->t_lflag, PENDIN); 1180 } 1181 } 1182 } 1183 tp->t_iflag = t->c_iflag; 1184 tp->t_oflag = t->c_oflag; 1185 /* 1186 * Make the EXTPROC bit read only. 1187 */ 1188 if (ISSET(tp->t_lflag, EXTPROC)) 1189 SET(t->c_lflag, EXTPROC); 1190 else 1191 CLR(t->c_lflag, EXTPROC); 1192 tp->t_lflag = t->c_lflag | ISSET(tp->t_lflag, PENDIN); 1193 memcpy(tp->t_cc, t->c_cc, sizeof(t->c_cc)); 1194 mutex_spin_exit(&tty_lock); 1195 splx(s); 1196 break; 1197 } 1198 case TIOCSETD: /* set line discipline (old) */ 1199 lp = ttyldisc_lookup_bynum(*(int *)data); 1200 goto setldisc; 1201 1202 case TIOCSLINED: { /* set line discipline (new) */ 1203 char *name = (char *)data; 1204 dev_t device; 1205 1206 /* Null terminate to prevent buffer overflow */ 1207 name[TTLINEDNAMELEN - 1] = '\0'; 1208 lp = ttyldisc_lookup(name); 1209 setldisc: 1210 if (lp == NULL) 1211 return (ENXIO); 1212 1213 if (lp != tp->t_linesw) { 1214 device = tp->t_dev; 1215 s = spltty(); 1216 (*tp->t_linesw->l_close)(tp, flag); 1217 error = (*lp->l_open)(device, tp); 1218 if (error) { 1219 (void)(*tp->t_linesw->l_open)(device, tp); 1220 splx(s); 1221 ttyldisc_release(lp); 1222 return (error); 1223 } 1224 ttyldisc_release(tp->t_linesw); 1225 tp->t_linesw = lp; 1226 splx(s); 1227 } else { 1228 /* Drop extra reference. */ 1229 ttyldisc_release(lp); 1230 } 1231 break; 1232 } 1233 case TIOCSTART: /* start output, like ^Q */ 1234 mutex_spin_enter(&tty_lock); 1235 if (ISSET(tp->t_state, TS_TTSTOP) || 1236 ISSET(tp->t_lflag, FLUSHO)) { 1237 CLR(tp->t_lflag, FLUSHO); 1238 CLR(tp->t_state, TS_TTSTOP); 1239 ttstart(tp); 1240 } 1241 mutex_spin_exit(&tty_lock); 1242 break; 1243 case TIOCSTI: /* simulate terminal input */ 1244 if ((error = kauth_authorize_device_tty(l->l_cred, 1245 KAUTH_DEVICE_TTY_STI, tp)) != 0) { 1246 if (!ISSET(flag, FREAD)) 1247 return EPERM; 1248 if (!isctty(p, tp)) 1249 return EACCES; 1250 if (tp->t_session->s_leader->p_cred != p->p_cred) 1251 return error; 1252 } 1253 (*tp->t_linesw->l_rint)(*(u_char *)data, tp); 1254 break; 1255 case TIOCSTOP: /* stop output, like ^S */ 1256 { 1257 mutex_spin_enter(&tty_lock); 1258 if (!ISSET(tp->t_state, TS_TTSTOP)) { 1259 SET(tp->t_state, TS_TTSTOP); 1260 cdev_stop(tp, 0); 1261 } 1262 mutex_spin_exit(&tty_lock); 1263 break; 1264 } 1265 case TIOCSCTTY: /* become controlling tty */ 1266 mutex_enter(&proc_lock); 1267 mutex_spin_enter(&tty_lock); 1268 1269 /* Session ctty vnode pointer set in vnode layer. */ 1270 if (!SESS_LEADER(p) || 1271 ((p->p_session->s_ttyvp || tp->t_session) && 1272 (tp->t_session != p->p_session))) { 1273 mutex_spin_exit(&tty_lock); 1274 mutex_exit(&proc_lock); 1275 return (EPERM); 1276 } 1277 1278 /* 1279 * `p_session' acquires a reference. 1280 * But note that if `t_session' is set at this point, 1281 * it must equal `p_session', in which case the session 1282 * already has the correct reference count. 1283 */ 1284 if (tp->t_session == NULL) { 1285 proc_sesshold(p->p_session); 1286 } 1287 tp->t_session = p->p_session; 1288 tp->t_pgrp = p->p_pgrp; 1289 p->p_session->s_ttyp = tp; 1290 p->p_lflag |= PL_CONTROLT; 1291 mutex_spin_exit(&tty_lock); 1292 mutex_exit(&proc_lock); 1293 break; 1294 case FIOSETOWN: { /* set pgrp of tty */ 1295 pid_t pgid = *(pid_t *)data; 1296 struct pgrp *pgrp; 1297 1298 mutex_enter(&proc_lock); 1299 if (tp->t_session != NULL && !isctty(p, tp)) { 1300 mutex_exit(&proc_lock); 1301 return (ENOTTY); 1302 } 1303 1304 if (pgid < 0) { 1305 if (pgid == INT_MIN) { 1306 mutex_exit(&proc_lock); 1307 return (EINVAL); 1308 } 1309 pgrp = pgrp_find(-pgid); 1310 if (pgrp == NULL) { 1311 mutex_exit(&proc_lock); 1312 return (EINVAL); 1313 } 1314 } else { 1315 struct proc *p1; 1316 p1 = proc_find(pgid); 1317 if (!p1) { 1318 mutex_exit(&proc_lock); 1319 return (ESRCH); 1320 } 1321 pgrp = p1->p_pgrp; 1322 } 1323 1324 if (pgrp->pg_session != p->p_session) { 1325 mutex_exit(&proc_lock); 1326 return (EPERM); 1327 } 1328 mutex_spin_enter(&tty_lock); 1329 tp->t_pgrp = pgrp; 1330 mutex_spin_exit(&tty_lock); 1331 mutex_exit(&proc_lock); 1332 break; 1333 } 1334 case TIOCSPGRP: { /* set pgrp of tty */ 1335 struct pgrp *pgrp; 1336 pid_t pgid = *(pid_t *)data; 1337 1338 if (pgid == NO_PGID) 1339 return EINVAL; 1340 1341 mutex_enter(&proc_lock); 1342 if (!isctty(p, tp)) { 1343 mutex_exit(&proc_lock); 1344 return (ENOTTY); 1345 } 1346 pgrp = pgrp_find(pgid); 1347 if (pgrp == NULL || pgrp->pg_session != p->p_session) { 1348 mutex_exit(&proc_lock); 1349 return (EPERM); 1350 } 1351 mutex_spin_enter(&tty_lock); 1352 tp->t_pgrp = pgrp; 1353 mutex_spin_exit(&tty_lock); 1354 mutex_exit(&proc_lock); 1355 break; 1356 } 1357 case TIOCSTAT: /* get load avg stats */ 1358 mutex_enter(&proc_lock); 1359 ttygetinfo(tp, 0, infobuf, sizeof(infobuf)); 1360 mutex_exit(&proc_lock); 1361 1362 mutex_spin_enter(&tty_lock); 1363 ttyputinfo(tp, infobuf); 1364 mutex_spin_exit(&tty_lock); 1365 break; 1366 case TIOCSWINSZ: /* set window size */ 1367 mutex_spin_enter(&tty_lock); 1368 if (memcmp((void *)&tp->t_winsize, data, 1369 sizeof(struct winsize))) { 1370 tp->t_winsize = *(struct winsize *)data; 1371 ttysig(tp, TTYSIG_PG1, SIGWINCH); 1372 } 1373 mutex_spin_exit(&tty_lock); 1374 break; 1375 case TIOCSQSIZE: 1376 if ((error = tty_get_qsize(&s, *(int *)data)) == 0 && 1377 s != tp->t_qsize) 1378 error = tty_set_qsize(tp, s); 1379 return error; 1380 1381 case TIOCSBRK: 1382 case TIOCCBRK: 1383 case TIOCSDTR: 1384 case TIOCCDTR: 1385 case TIOCSFLAGS: 1386 case TIOCGFLAGS: 1387 case TIOCMSET: 1388 case TIOCMGET: 1389 case TIOCMBIS: 1390 case TIOCMBIC: 1391 /* Handled by the driver layer */ 1392 return EPASSTHROUGH; 1393 1394 case TIOCEXT: 1395 case TIOCPTSNAME: 1396 case TIOCGRANTPT: 1397 case TIOCPKT: 1398 case TIOCUCNTL: 1399 case TIOCREMOTE: 1400 case TIOCSIG: 1401 /* for ptys */ 1402 return EPASSTHROUGH; 1403 1404 default: 1405 /* Pass through various console ioctls */ 1406 switch (IOCGROUP(cmd)) { 1407 case 'c': /* syscons console */ 1408 case 'v': /* usl console, video - where one letter */ 1409 case 'K': /* usl console, keyboard - aint enough */ 1410 case 'V': /* pcvt compat */ 1411 case 'W': /* wscons console */ 1412 return EPASSTHROUGH; 1413 default: 1414 break; 1415 } 1416 1417 /* We may have to load the compat_60 module for this. */ 1418 (void)module_autoload("compat_60", MODULE_CLASS_EXEC); 1419 MODULE_HOOK_CALL(tty_ttioctl_60_hook, 1420 (tp, cmd, data, flag, l), enosys(), error); 1421 if (error != EPASSTHROUGH) 1422 return error; 1423 1424 /* We may have to load the compat_43 module for this. */ 1425 (void)module_autoload("compat_43", MODULE_CLASS_EXEC); 1426 MODULE_HOOK_CALL(tty_ttioctl_43_hook, 1427 (tp, cmd, data, flag, l), enosys(), error); 1428 return error; 1429 } 1430 return (0); 1431 } 1432 1433 int 1434 ttpoll(struct tty *tp, int events, struct lwp *l) 1435 { 1436 int revents; 1437 1438 revents = 0; 1439 mutex_spin_enter(&tty_lock); 1440 if (events & (POLLIN | POLLRDNORM)) 1441 if (ttnread(tp) > 0) 1442 revents |= events & (POLLIN | POLLRDNORM); 1443 1444 if (events & (POLLOUT | POLLWRNORM)) 1445 if (tp->t_outq.c_cc <= tp->t_lowat) 1446 revents |= events & (POLLOUT | POLLWRNORM); 1447 1448 if (events & POLLHUP) 1449 if (!CONNECTED(tp)) 1450 revents |= POLLHUP; 1451 1452 if (revents == 0) { 1453 if (events & (POLLIN | POLLHUP | POLLRDNORM)) 1454 selrecord(l, &tp->t_rsel); 1455 1456 if (events & (POLLOUT | POLLWRNORM)) 1457 selrecord(l, &tp->t_wsel); 1458 } 1459 1460 mutex_spin_exit(&tty_lock); 1461 1462 return (revents); 1463 } 1464 1465 static void 1466 filt_ttyrdetach(struct knote *kn) 1467 { 1468 struct tty *tp; 1469 1470 tp = kn->kn_hook; 1471 mutex_spin_enter(&tty_lock); 1472 selremove_knote(&tp->t_rsel, kn); 1473 mutex_spin_exit(&tty_lock); 1474 } 1475 1476 static int 1477 filt_ttyread(struct knote *kn, long hint) 1478 { 1479 struct tty *tp; 1480 1481 tp = kn->kn_hook; 1482 if ((hint & NOTE_SUBMIT) == 0) 1483 mutex_spin_enter(&tty_lock); 1484 kn->kn_data = ttnread(tp); 1485 if ((hint & NOTE_SUBMIT) == 0) 1486 mutex_spin_exit(&tty_lock); 1487 return (kn->kn_data > 0); 1488 } 1489 1490 static void 1491 filt_ttywdetach(struct knote *kn) 1492 { 1493 struct tty *tp; 1494 1495 tp = kn->kn_hook; 1496 mutex_spin_enter(&tty_lock); 1497 selremove_knote(&tp->t_wsel, kn); 1498 mutex_spin_exit(&tty_lock); 1499 } 1500 1501 static int 1502 filt_ttywrite(struct knote *kn, long hint) 1503 { 1504 struct tty *tp; 1505 int canwrite; 1506 1507 tp = kn->kn_hook; 1508 if ((hint & NOTE_SUBMIT) == 0) 1509 mutex_spin_enter(&tty_lock); 1510 kn->kn_data = tp->t_outq.c_cn - tp->t_outq.c_cc; 1511 canwrite = (tp->t_outq.c_cc <= tp->t_lowat) && CONNECTED(tp); 1512 if ((hint & NOTE_SUBMIT) == 0) 1513 mutex_spin_exit(&tty_lock); 1514 return (canwrite); 1515 } 1516 1517 static const struct filterops ttyread_filtops = { 1518 .f_flags = FILTEROP_ISFD, 1519 .f_attach = NULL, 1520 .f_detach = filt_ttyrdetach, 1521 .f_event = filt_ttyread, 1522 }; 1523 1524 static const struct filterops ttywrite_filtops = { 1525 .f_flags = FILTEROP_ISFD, 1526 .f_attach = NULL, 1527 .f_detach = filt_ttywdetach, 1528 .f_event = filt_ttywrite, 1529 }; 1530 1531 int 1532 ttykqfilter(dev_t dev, struct knote *kn) 1533 { 1534 struct tty *tp; 1535 struct selinfo *sip; 1536 1537 if ((tp = cdev_tty(dev)) == NULL) 1538 return (ENXIO); 1539 1540 switch (kn->kn_filter) { 1541 case EVFILT_READ: 1542 sip = &tp->t_rsel; 1543 kn->kn_fop = &ttyread_filtops; 1544 break; 1545 case EVFILT_WRITE: 1546 sip = &tp->t_wsel; 1547 kn->kn_fop = &ttywrite_filtops; 1548 break; 1549 default: 1550 return EINVAL; 1551 } 1552 1553 kn->kn_hook = tp; 1554 1555 mutex_spin_enter(&tty_lock); 1556 selrecord_knote(sip, kn); 1557 mutex_spin_exit(&tty_lock); 1558 1559 return (0); 1560 } 1561 1562 /* 1563 * Find the number of chars ready to be read from this tty. 1564 * Call with the tty lock held. 1565 */ 1566 static int 1567 ttnread(struct tty *tp) 1568 { 1569 int nread; 1570 1571 KASSERT(mutex_owned(&tty_lock)); 1572 1573 if (ISSET(tp->t_lflag, PENDIN)) 1574 ttypend(tp); 1575 nread = tp->t_canq.c_cc; 1576 if (!ISSET(tp->t_lflag, ICANON)) { 1577 nread += tp->t_rawq.c_cc; 1578 if (nread < tp->t_cc[VMIN] && !tp->t_cc[VTIME]) 1579 nread = 0; 1580 } 1581 return (nread); 1582 } 1583 1584 /* 1585 * Wait for output to drain, or if this times out, flush it. 1586 */ 1587 static int 1588 ttywait_timo(struct tty *tp, int timo) 1589 { 1590 int error; 1591 1592 error = 0; 1593 1594 mutex_spin_enter(&tty_lock); 1595 while ((tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY)) && 1596 CONNECTED(tp) && tp->t_oproc) { 1597 (*tp->t_oproc)(tp); 1598 error = ttysleep(tp, &tp->t_outcv, true, timo); 1599 if (error == EWOULDBLOCK) 1600 ttyflush(tp, FWRITE); 1601 if (error) 1602 break; 1603 } 1604 mutex_spin_exit(&tty_lock); 1605 1606 return (error); 1607 } 1608 1609 /* 1610 * Wait for output to drain. 1611 */ 1612 int 1613 ttywait(struct tty *tp) 1614 { 1615 return ttywait_timo(tp, 0); 1616 } 1617 1618 /* 1619 * Flush if successfully wait. 1620 */ 1621 int 1622 ttywflush(struct tty *tp) 1623 { 1624 int error; 1625 1626 error = ttywait_timo(tp, 5 * hz); 1627 if (error == 0 || error == EWOULDBLOCK) { 1628 mutex_spin_enter(&tty_lock); 1629 ttyflush(tp, FREAD); 1630 mutex_spin_exit(&tty_lock); 1631 } 1632 return (error); 1633 } 1634 1635 /* 1636 * Flush tty read and/or write queues, notifying anyone waiting. 1637 * Call with the tty lock held. 1638 */ 1639 void 1640 ttyflush(struct tty *tp, int rw) 1641 { 1642 1643 KASSERT(mutex_owned(&tty_lock)); 1644 1645 if (rw & FREAD) { 1646 FLUSHQ(&tp->t_canq); 1647 FLUSHQ(&tp->t_rawq); 1648 tp->t_rocount = 0; 1649 tp->t_rocol = 0; 1650 CLR(tp->t_state, TS_LOCAL); 1651 ttwakeup(tp); 1652 } 1653 if (rw & FWRITE) { 1654 CLR(tp->t_state, TS_TTSTOP); 1655 cdev_stop(tp, rw); 1656 FLUSHQ(&tp->t_outq); 1657 cv_broadcast(&tp->t_outcv); 1658 selnotify(&tp->t_wsel, 0, NOTE_SUBMIT); 1659 } 1660 } 1661 1662 /* 1663 * Copy in the default termios characters. 1664 */ 1665 void 1666 ttychars(struct tty *tp) 1667 { 1668 1669 memcpy(tp->t_cc, ttydefchars, sizeof(ttydefchars)); 1670 } 1671 1672 /* 1673 * Send stop character on input overflow. 1674 * Call with the tty lock held. 1675 */ 1676 static void 1677 ttyblock(struct tty *tp) 1678 { 1679 int total; 1680 1681 KASSERT(mutex_owned(&tty_lock)); 1682 1683 total = tp->t_rawq.c_cc + tp->t_canq.c_cc; 1684 if (tp->t_rawq.c_cc > TTYHOG) { 1685 ttyflush(tp, FREAD | FWRITE); 1686 CLR(tp->t_state, TS_TBLOCK); 1687 } 1688 /* 1689 * Block further input iff: current input > threshold 1690 * AND input is available to user program. 1691 */ 1692 if (total >= TTYHOG / 2 && 1693 !ISSET(tp->t_state, TS_TBLOCK) && 1694 (!ISSET(tp->t_lflag, ICANON) || tp->t_canq.c_cc > 0)) { 1695 if (ISSET(tp->t_iflag, IXOFF) && 1696 tp->t_cc[VSTOP] != _POSIX_VDISABLE && 1697 putc(tp->t_cc[VSTOP], &tp->t_outq) == 0) { 1698 SET(tp->t_state, TS_TBLOCK); 1699 ttstart(tp); 1700 } 1701 /* Try to block remote output via hardware flow control. */ 1702 if (ISSET(tp->t_cflag, CHWFLOW) && tp->t_hwiflow && 1703 (*tp->t_hwiflow)(tp, 1) != 0) 1704 SET(tp->t_state, TS_TBLOCK); 1705 } 1706 } 1707 1708 /* 1709 * Delayed line discipline output 1710 */ 1711 void 1712 ttrstrt(void *tp_arg) 1713 { 1714 struct tty *tp; 1715 1716 #ifdef DIAGNOSTIC 1717 if (tp_arg == NULL) 1718 panic("ttrstrt"); 1719 #endif 1720 tp = tp_arg; 1721 mutex_spin_enter(&tty_lock); 1722 1723 CLR(tp->t_state, TS_TIMEOUT); 1724 ttstart(tp); /* XXX - Shouldn't this be tp->l_start(tp)? */ 1725 1726 mutex_spin_exit(&tty_lock); 1727 } 1728 1729 /* 1730 * start a line discipline 1731 * Always call with tty lock held? 1732 */ 1733 int 1734 ttstart(struct tty *tp) 1735 { 1736 1737 if (tp->t_oproc != NULL) /* XXX: Kludge for pty. */ 1738 (*tp->t_oproc)(tp); 1739 return (0); 1740 } 1741 1742 /* 1743 * "close" a line discipline 1744 */ 1745 int 1746 ttylclose(struct tty *tp, int flag) 1747 { 1748 1749 if (flag & FNONBLOCK) { 1750 mutex_spin_enter(&tty_lock); 1751 ttyflush(tp, FREAD | FWRITE); 1752 mutex_spin_exit(&tty_lock); 1753 } else 1754 ttywflush(tp); 1755 return (0); 1756 } 1757 1758 /* 1759 * Handle modem control transition on a tty. 1760 * Flag indicates new state of carrier. 1761 * Returns 0 if the line should be turned off, otherwise 1. 1762 */ 1763 int 1764 ttymodem(struct tty *tp, int flag) 1765 { 1766 1767 mutex_spin_enter(&tty_lock); 1768 if (flag == 0) { 1769 if (ISSET(tp->t_state, TS_CARR_ON)) { 1770 /* 1771 * Lost carrier. 1772 */ 1773 CLR(tp->t_state, TS_CARR_ON); 1774 if (ISSET(tp->t_state, TS_ISOPEN) && !CONNECTED(tp)) { 1775 ttysig(tp, TTYSIG_LEADER, SIGHUP); 1776 ttyflush(tp, FREAD | FWRITE); 1777 mutex_spin_exit(&tty_lock); 1778 return (0); 1779 } 1780 } 1781 } else { 1782 if (!ISSET(tp->t_state, TS_CARR_ON)) { 1783 /* 1784 * Carrier now on. 1785 */ 1786 SET(tp->t_state, TS_CARR_ON); 1787 ttwakeup(tp); 1788 } 1789 } 1790 mutex_spin_exit(&tty_lock); 1791 1792 return (1); 1793 } 1794 1795 /* 1796 * Default modem control routine (for other line disciplines). 1797 * Return argument flag, to turn off device on carrier drop. 1798 */ 1799 int 1800 nullmodem(struct tty *tp, int flag) 1801 { 1802 1803 mutex_spin_enter(&tty_lock); 1804 if (flag) 1805 SET(tp->t_state, TS_CARR_ON); 1806 else { 1807 CLR(tp->t_state, TS_CARR_ON); 1808 if (!CONNECTED(tp)) { 1809 ttysig(tp, TTYSIG_LEADER, SIGHUP); 1810 mutex_spin_exit(&tty_lock); 1811 return (0); 1812 } 1813 } 1814 mutex_spin_exit(&tty_lock); 1815 1816 return (1); 1817 } 1818 1819 /* 1820 * Reinput pending characters after state switch. 1821 */ 1822 void 1823 ttypend(struct tty *tp) 1824 { 1825 struct clist tq; 1826 int c; 1827 1828 KASSERT(mutex_owned(&tty_lock)); 1829 1830 CLR(tp->t_lflag, PENDIN); 1831 SET(tp->t_state, TS_TYPEN); 1832 tq = tp->t_rawq; 1833 tp->t_rawq.c_cc = 0; 1834 tp->t_rawq.c_cf = tp->t_rawq.c_cl = 0; 1835 while ((c = getc(&tq)) >= 0) 1836 ttyinput_wlock(c, tp); 1837 CLR(tp->t_state, TS_TYPEN); 1838 } 1839 1840 /* 1841 * Process a read call on a tty device. 1842 */ 1843 int 1844 ttread(struct tty *tp, struct uio *uio, int flag) 1845 { 1846 struct clist *qp; 1847 u_char *cc; 1848 struct proc *p; 1849 int c, first, error, has_stime, last_cc; 1850 long lflag, slp; 1851 struct timeval now, stime; 1852 1853 if (uio->uio_resid == 0) 1854 return 0; 1855 1856 stime.tv_usec = 0; /* XXX gcc */ 1857 stime.tv_sec = 0; /* XXX gcc */ 1858 1859 cc = tp->t_cc; 1860 p = curproc; 1861 error = 0; 1862 has_stime = 0; 1863 last_cc = 0; 1864 slp = 0; 1865 1866 loop: 1867 mutex_spin_enter(&tty_lock); 1868 lflag = tp->t_lflag; 1869 /* 1870 * take pending input first 1871 */ 1872 if (ISSET(lflag, PENDIN)) 1873 ttypend(tp); 1874 1875 /* 1876 * Hang process if it's in the background. 1877 */ 1878 if (isbackground(p, tp)) { 1879 if (sigismasked(curlwp, SIGTTIN) || 1880 p->p_lflag & PL_PPWAIT || p->p_pgrp->pg_jobc == 0) { 1881 mutex_spin_exit(&tty_lock); 1882 return (EIO); 1883 } 1884 mutex_spin_exit(&tty_lock); 1885 1886 mutex_enter(&proc_lock); 1887 pgsignal(p->p_pgrp, SIGTTIN, 1); 1888 mutex_exit(&proc_lock); 1889 1890 mutex_spin_enter(&tty_lock); 1891 error = ttypause(tp, hz); 1892 mutex_spin_exit(&tty_lock); 1893 if (error) 1894 return (error); 1895 goto loop; 1896 } 1897 1898 if (!ISSET(lflag, ICANON)) { 1899 int m = cc[VMIN]; 1900 long t = cc[VTIME]; 1901 1902 qp = &tp->t_rawq; 1903 /* 1904 * Check each of the four combinations. 1905 * (m > 0 && t == 0) is the normal read case. 1906 * It should be fairly efficient, so we check that and its 1907 * companion case (m == 0 && t == 0) first. 1908 * For the other two cases, we compute the target sleep time 1909 * into slp. 1910 */ 1911 if (t == 0) { 1912 if (qp->c_cc < m) 1913 goto sleep; 1914 goto read; 1915 } 1916 t *= hz; /* time in deca-ticks */ 1917 /* 1918 * Time difference in deca-ticks, split division to avoid numeric overflow. 1919 * Ok for hz < ~200kHz 1920 */ 1921 #define diff(t1, t2) (((t1).tv_sec - (t2).tv_sec) * 10 * hz + \ 1922 ((t1).tv_usec - (t2).tv_usec) / 100 * hz / 1000) 1923 if (m > 0) { 1924 if (qp->c_cc <= 0) 1925 goto sleep; 1926 if (qp->c_cc >= m) 1927 goto read; 1928 if (!has_stime) { 1929 /* first character, start timer */ 1930 has_stime = 1; 1931 getmicrotime(&stime); 1932 slp = t; 1933 } else if (qp->c_cc > last_cc) { 1934 /* got a character, restart timer */ 1935 getmicrotime(&stime); 1936 slp = t; 1937 } else { 1938 /* nothing, check expiration */ 1939 getmicrotime(&now); 1940 slp = t - diff(now, stime); 1941 } 1942 } else { /* m == 0 */ 1943 if (qp->c_cc > 0) 1944 goto read; 1945 if (!has_stime) { 1946 has_stime = 1; 1947 getmicrotime(&stime); 1948 slp = t; 1949 } else { 1950 getmicrotime(&now); 1951 slp = t - diff(now, stime); 1952 } 1953 } 1954 last_cc = qp->c_cc; 1955 #undef diff 1956 if (slp > 0) { 1957 /* 1958 * Convert deca-ticks back to ticks. 1959 * Rounding down may make us wake up just short 1960 * of the target, so we round up. 1961 * Maybe we should do 'slp/10 + 1' because the 1962 * first tick maybe almost immediate. 1963 * However it is more useful for a program that sets 1964 * VTIME=10 to wakeup every second not every 1.01 1965 * seconds (if hz=100). 1966 */ 1967 slp = (slp + 9)/ 10; 1968 goto sleep; 1969 } 1970 } else if ((qp = &tp->t_canq)->c_cc <= 0) { 1971 int carrier; 1972 1973 sleep: 1974 /* 1975 * If there is no input, sleep on rawq 1976 * awaiting hardware receipt and notification. 1977 * If we have data, we don't need to check for carrier. 1978 */ 1979 carrier = CONNECTED(tp); 1980 if (!carrier && ISSET(tp->t_state, TS_ISOPEN)) { 1981 mutex_spin_exit(&tty_lock); 1982 return (0); /* EOF */ 1983 } 1984 if (!has_stime || slp <= 0) { 1985 if (flag & IO_NDELAY) { 1986 mutex_spin_exit(&tty_lock); 1987 return (EWOULDBLOCK); 1988 } 1989 } 1990 error = ttysleep(tp, &tp->t_rawcv, true, slp); 1991 mutex_spin_exit(&tty_lock); 1992 /* VMIN == 0: any quantity read satisfies */ 1993 if (cc[VMIN] == 0 && error == EWOULDBLOCK) 1994 return (0); 1995 if (error && error != EWOULDBLOCK) 1996 return (error); 1997 goto loop; 1998 } 1999 read: 2000 2001 /* 2002 * Input present, check for input mapping and processing. 2003 */ 2004 first = 1; 2005 while ((c = getc(qp)) >= 0) { 2006 /* 2007 * delayed suspend (^Y) 2008 */ 2009 if (CCEQ(cc[VDSUSP], c) && 2010 ISSET(lflag, IEXTEN|ISIG) == (IEXTEN|ISIG)) { 2011 ttysig(tp, TTYSIG_PG1, SIGTSTP); 2012 if (first) { 2013 error = ttypause(tp, hz); 2014 if (error) 2015 break; 2016 mutex_spin_exit(&tty_lock); 2017 goto loop; 2018 } 2019 break; 2020 } 2021 /* 2022 * Interpret EOF only in canonical mode. 2023 */ 2024 if (CCEQ(cc[VEOF], c) && ISSET(lflag, ICANON)) 2025 break; 2026 /* 2027 * Give user character. 2028 */ 2029 mutex_spin_exit(&tty_lock); 2030 error = ureadc(c, uio); 2031 mutex_spin_enter(&tty_lock); 2032 if (error) 2033 break; 2034 if (uio->uio_resid == 0) 2035 break; 2036 /* 2037 * In canonical mode check for a "break character" 2038 * marking the end of a "line of input". 2039 */ 2040 if (ISSET(lflag, ICANON) && TTBREAKC(c, lflag)) 2041 break; 2042 first = 0; 2043 } 2044 2045 /* 2046 * Look to unblock output now that (presumably) 2047 * the input queue has gone down. 2048 */ 2049 if (ISSET(tp->t_state, TS_TBLOCK) && tp->t_rawq.c_cc < TTYHOG / 5) { 2050 if (ISSET(tp->t_iflag, IXOFF) && 2051 cc[VSTART] != _POSIX_VDISABLE && 2052 putc(cc[VSTART], &tp->t_outq) == 0) { 2053 CLR(tp->t_state, TS_TBLOCK); 2054 ttstart(tp); 2055 } 2056 /* Try to unblock remote output via hardware flow control. */ 2057 if (ISSET(tp->t_cflag, CHWFLOW) && tp->t_hwiflow && 2058 (*tp->t_hwiflow)(tp, 0) != 0) 2059 CLR(tp->t_state, TS_TBLOCK); 2060 } 2061 mutex_spin_exit(&tty_lock); 2062 2063 return (error); 2064 } 2065 2066 /* 2067 * Check the output queue on tp for space for a kernel message (from uprintf 2068 * or tprintf). Allow some space over the normal hiwater mark so we don't 2069 * lose messages due to normal flow control, but don't let the tty run amok. 2070 * Sleeps here are not interruptible, but we return prematurely if new signals 2071 * arrive. 2072 * Call with tty lock held. 2073 */ 2074 static int 2075 ttycheckoutq_wlock(struct tty *tp, int wait) 2076 { 2077 int hiwat, error; 2078 2079 KASSERT(mutex_owned(&tty_lock)); 2080 2081 hiwat = tp->t_hiwat; 2082 if (tp->t_outq.c_cc > hiwat + 200) 2083 while (tp->t_outq.c_cc > hiwat) { 2084 ttstart(tp); 2085 if (wait == 0) 2086 return (0); 2087 error = ttysleep(tp, &tp->t_outcv, true, hz); 2088 if (error == EINTR) 2089 wait = 0; 2090 } 2091 2092 return (1); 2093 } 2094 2095 int 2096 ttycheckoutq(struct tty *tp, int wait) 2097 { 2098 int r; 2099 2100 mutex_spin_enter(&tty_lock); 2101 r = ttycheckoutq_wlock(tp, wait); 2102 mutex_spin_exit(&tty_lock); 2103 2104 return (r); 2105 } 2106 2107 /* 2108 * Process a write call on a tty device. 2109 */ 2110 int 2111 ttwrite(struct tty *tp, struct uio *uio, int flag) 2112 { 2113 u_char *cp; 2114 struct proc *p; 2115 int cc, ce, i, hiwat, error; 2116 u_char obuf[OBUFSIZ]; 2117 2118 cp = NULL; 2119 hiwat = tp->t_hiwat; 2120 error = 0; 2121 cc = 0; 2122 loop: 2123 mutex_spin_enter(&tty_lock); 2124 if (!CONNECTED(tp)) { 2125 if (ISSET(tp->t_state, TS_ISOPEN)) { 2126 mutex_spin_exit(&tty_lock); 2127 return (EIO); 2128 } else if (flag & IO_NDELAY) { 2129 mutex_spin_exit(&tty_lock); 2130 error = EWOULDBLOCK; 2131 goto out; 2132 } else { 2133 /* Sleep awaiting carrier. */ 2134 error = ttysleep(tp, &tp->t_rawcv, true, 0); 2135 mutex_spin_exit(&tty_lock); 2136 if (error) 2137 goto out; 2138 goto loop; 2139 } 2140 } 2141 2142 /* 2143 * Hang the process if it's in the background. 2144 */ 2145 p = curproc; 2146 if (isbackground(p, tp) && 2147 ISSET(tp->t_lflag, TOSTOP) && (p->p_lflag & PL_PPWAIT) == 0 && 2148 !sigismasked(curlwp, SIGTTOU)) { 2149 if (p->p_pgrp->pg_jobc == 0) { 2150 error = EIO; 2151 mutex_spin_exit(&tty_lock); 2152 goto out; 2153 } 2154 mutex_spin_exit(&tty_lock); 2155 2156 mutex_enter(&proc_lock); 2157 pgsignal(p->p_pgrp, SIGTTOU, 1); 2158 mutex_exit(&proc_lock); 2159 2160 mutex_spin_enter(&tty_lock); 2161 error = ttypause(tp, hz); 2162 mutex_spin_exit(&tty_lock); 2163 if (error) 2164 goto out; 2165 goto loop; 2166 } 2167 mutex_spin_exit(&tty_lock); 2168 2169 /* 2170 * Process the user's data in at most OBUFSIZ chunks. Perform any 2171 * output translation. Keep track of high water mark, sleep on 2172 * overflow awaiting device aid in acquiring new space. 2173 */ 2174 while (uio->uio_resid > 0 || cc > 0) { 2175 if (ISSET(tp->t_lflag, FLUSHO)) { 2176 uio->uio_resid = 0; 2177 return (0); 2178 } 2179 if (tp->t_outq.c_cc > hiwat) 2180 goto ovhiwat; 2181 /* 2182 * Grab a hunk of data from the user, unless we have some 2183 * leftover from last time. 2184 */ 2185 if (cc == 0) { 2186 cc = uimin(uio->uio_resid, OBUFSIZ); 2187 cp = obuf; 2188 error = uiomove(cp, cc, uio); 2189 if (error) { 2190 cc = 0; 2191 goto out; 2192 } 2193 } 2194 /* 2195 * If nothing fancy need be done, grab those characters we 2196 * can handle without any of ttyoutput's processing and 2197 * just transfer them to the output q. For those chars 2198 * which require special processing (as indicated by the 2199 * bits in char_type), call ttyoutput. After processing 2200 * a hunk of data, look for FLUSHO so ^O's will take effect 2201 * immediately. 2202 */ 2203 mutex_spin_enter(&tty_lock); 2204 while (cc > 0) { 2205 if (!ISSET(tp->t_oflag, OPOST)) 2206 ce = cc; 2207 else { 2208 ce = cc - scanc((u_int)cc, cp, char_type, 2209 CCLASSMASK); 2210 /* 2211 * If ce is zero, then we're processing 2212 * a special character through ttyoutput. 2213 */ 2214 if (ce == 0) { 2215 tp->t_rocount = 0; 2216 if (ttyoutput(*cp, tp) >= 0) { 2217 /* out of space */ 2218 mutex_spin_exit(&tty_lock); 2219 goto overfull; 2220 } 2221 cp++; 2222 cc--; 2223 if (ISSET(tp->t_lflag, FLUSHO) || 2224 tp->t_outq.c_cc > hiwat) { 2225 mutex_spin_exit(&tty_lock); 2226 goto ovhiwat; 2227 } 2228 continue; 2229 } 2230 } 2231 /* 2232 * A bunch of normal characters have been found. 2233 * Transfer them en masse to the output queue and 2234 * continue processing at the top of the loop. 2235 * If there are any further characters in this 2236 * <= OBUFSIZ chunk, the first should be a character 2237 * requiring special handling by ttyoutput. 2238 */ 2239 tp->t_rocount = 0; 2240 i = b_to_q(cp, ce, &tp->t_outq); 2241 ce -= i; 2242 tp->t_column += ce; 2243 cp += ce, cc -= ce, tk_nout += ce; 2244 tp->t_outcc += ce; 2245 if (i > 0) { 2246 /* out of space */ 2247 mutex_spin_exit(&tty_lock); 2248 goto overfull; 2249 } 2250 if (ISSET(tp->t_lflag, FLUSHO) || 2251 tp->t_outq.c_cc > hiwat) 2252 break; 2253 } 2254 ttstart(tp); 2255 mutex_spin_exit(&tty_lock); 2256 } 2257 2258 out: 2259 /* 2260 * If cc is nonzero, we leave the uio structure inconsistent, as the 2261 * offset and iov pointers have moved forward, but it doesn't matter 2262 * (the call will either return short or restart with a new uio). 2263 */ 2264 uio->uio_resid += cc; 2265 return (error); 2266 2267 overfull: 2268 /* 2269 * Since we are using ring buffers, if we can't insert any more into 2270 * the output queue, we can assume the ring is full and that someone 2271 * forgot to set the high water mark correctly. We set it and then 2272 * proceed as normal. 2273 */ 2274 hiwat = tp->t_outq.c_cc - 1; 2275 2276 ovhiwat: 2277 mutex_spin_enter(&tty_lock); 2278 ttstart(tp); 2279 /* 2280 * This can only occur if FLUSHO is set in t_lflag, 2281 * or if ttstart/oproc is synchronous (or very fast). 2282 */ 2283 if (tp->t_outq.c_cc <= hiwat) { 2284 mutex_spin_exit(&tty_lock); 2285 goto loop; 2286 } 2287 if (flag & IO_NDELAY) { 2288 mutex_spin_exit(&tty_lock); 2289 error = EWOULDBLOCK; 2290 goto out; 2291 } 2292 error = ttysleep(tp, &tp->t_outcv, true, 0); 2293 mutex_spin_exit(&tty_lock); 2294 if (error) 2295 goto out; 2296 goto loop; 2297 } 2298 2299 /* 2300 * Try to pull more output from the producer. Return non-zero if 2301 * there is output ready to be sent. 2302 */ 2303 bool 2304 ttypull(struct tty *tp) 2305 { 2306 2307 /* XXXSMP not yet KASSERT(mutex_owned(&tty_lock)); */ 2308 2309 if (tp->t_outq.c_cc <= tp->t_lowat) { 2310 cv_broadcast(&tp->t_outcv); 2311 selnotify(&tp->t_wsel, 0, NOTE_SUBMIT); 2312 } 2313 return tp->t_outq.c_cc != 0; 2314 } 2315 2316 /* 2317 * Rubout one character from the rawq of tp 2318 * as cleanly as possible. 2319 * Called with tty lock held. 2320 */ 2321 void 2322 ttyrub(int c, struct tty *tp) 2323 { 2324 u_char *cp; 2325 int savecol, tabc; 2326 2327 KASSERT(mutex_owned(&tty_lock)); 2328 2329 if (!ISSET(tp->t_lflag, ECHO) || ISSET(tp->t_lflag, EXTPROC)) 2330 return; 2331 CLR(tp->t_lflag, FLUSHO); 2332 if (ISSET(tp->t_lflag, ECHOE)) { 2333 if (tp->t_rocount == 0) { 2334 /* 2335 * Screwed by ttwrite; retype 2336 */ 2337 ttyretype(tp); 2338 return; 2339 } 2340 if (c == ('\t' | TTY_QUOTE) || c == ('\n' | TTY_QUOTE)) 2341 ttyrubo(tp, 2); 2342 else { 2343 CLR(c, ~TTY_CHARMASK); 2344 switch (CCLASS(c)) { 2345 case ORDINARY: 2346 ttyrubo(tp, 1); 2347 break; 2348 case BACKSPACE: 2349 case CONTROL: 2350 case NEWLINE: 2351 case RETURN: 2352 case VTAB: 2353 if (ISSET(tp->t_lflag, ECHOCTL)) 2354 ttyrubo(tp, 2); 2355 break; 2356 case TAB: 2357 if (tp->t_rocount < tp->t_rawq.c_cc) { 2358 ttyretype(tp); 2359 return; 2360 } 2361 savecol = tp->t_column; 2362 SET(tp->t_state, TS_CNTTB); 2363 SET(tp->t_lflag, FLUSHO); 2364 tp->t_column = tp->t_rocol; 2365 for (cp = firstc(&tp->t_rawq, &tabc); cp; 2366 cp = nextc(&tp->t_rawq, cp, &tabc)) 2367 ttyecho(tabc, tp); 2368 CLR(tp->t_lflag, FLUSHO); 2369 CLR(tp->t_state, TS_CNTTB); 2370 2371 /* savecol will now be length of the tab. */ 2372 savecol -= tp->t_column; 2373 tp->t_column += savecol; 2374 if (savecol > 8) 2375 savecol = 8; /* overflow screw */ 2376 while (--savecol >= 0) 2377 (void)ttyoutput('\b', tp); 2378 break; 2379 default: /* XXX */ 2380 (void)printf("ttyrub: would panic c = %d, " 2381 "val = %d\n", c, CCLASS(c)); 2382 } 2383 } 2384 } else if (ISSET(tp->t_lflag, ECHOPRT)) { 2385 if (!ISSET(tp->t_state, TS_ERASE)) { 2386 SET(tp->t_state, TS_ERASE); 2387 (void)ttyoutput('\\', tp); 2388 } 2389 ttyecho(c, tp); 2390 } else 2391 ttyecho(tp->t_cc[VERASE], tp); 2392 --tp->t_rocount; 2393 } 2394 2395 /* 2396 * Back over cnt characters, erasing them. 2397 * Called with tty lock held. 2398 */ 2399 static void 2400 ttyrubo(struct tty *tp, int cnt) 2401 { 2402 2403 KASSERT(mutex_owned(&tty_lock)); 2404 2405 while (cnt-- > 0) { 2406 (void)ttyoutput('\b', tp); 2407 (void)ttyoutput(' ', tp); 2408 (void)ttyoutput('\b', tp); 2409 } 2410 } 2411 2412 /* 2413 * ttyretype -- 2414 * Reprint the rawq line. Note, it is assumed that c_cc has already 2415 * been checked. 2416 * 2417 * Called with tty lock held. 2418 */ 2419 void 2420 ttyretype(struct tty *tp) 2421 { 2422 u_char *cp; 2423 int c; 2424 2425 KASSERT(mutex_owned(&tty_lock)); 2426 2427 /* Echo the reprint character. */ 2428 if (tp->t_cc[VREPRINT] != _POSIX_VDISABLE) 2429 ttyecho(tp->t_cc[VREPRINT], tp); 2430 2431 (void)ttyoutput('\n', tp); 2432 2433 for (cp = firstc(&tp->t_canq, &c); cp; cp = nextc(&tp->t_canq, cp, &c)) 2434 ttyecho(c, tp); 2435 for (cp = firstc(&tp->t_rawq, &c); cp; cp = nextc(&tp->t_rawq, cp, &c)) 2436 ttyecho(c, tp); 2437 CLR(tp->t_state, TS_ERASE); 2438 2439 tp->t_rocount = tp->t_rawq.c_cc; 2440 tp->t_rocol = 0; 2441 } 2442 2443 /* 2444 * Echo a typed character to the terminal. 2445 * Called with tty lock held. 2446 */ 2447 static void 2448 ttyecho(int c, struct tty *tp) 2449 { 2450 2451 KASSERT(mutex_owned(&tty_lock)); 2452 2453 if (!ISSET(tp->t_state, TS_CNTTB)) 2454 CLR(tp->t_lflag, FLUSHO); 2455 if ((!ISSET(tp->t_lflag, ECHO) && 2456 (!ISSET(tp->t_lflag, ECHONL) || c != '\n')) || 2457 ISSET(tp->t_lflag, EXTPROC)) 2458 return; 2459 if (((ISSET(tp->t_lflag, ECHOCTL) && 2460 (ISSET(c, TTY_CHARMASK) <= 037 && c != '\t' && c != '\n')) || 2461 ISSET(c, TTY_CHARMASK) == 0177)) { 2462 (void)ttyoutput('^', tp); 2463 CLR(c, ~TTY_CHARMASK); 2464 if (c == 0177) 2465 c = '?'; 2466 else 2467 c += 'A' - 1; 2468 } 2469 (void)ttyoutput(c, tp); 2470 } 2471 2472 /* 2473 * Wake up any readers on a tty. 2474 * Called with tty lock held. 2475 */ 2476 void 2477 ttwakeup(struct tty *tp) 2478 { 2479 2480 KASSERT(mutex_owned(&tty_lock)); 2481 2482 selnotify(&tp->t_rsel, 0, NOTE_SUBMIT); 2483 if (ISSET(tp->t_state, TS_ASYNC)) 2484 ttysig(tp, TTYSIG_PG2, SIGIO); 2485 cv_broadcast(&tp->t_rawcv); 2486 } 2487 2488 /* 2489 * Look up a code for a specified speed in a conversion table; 2490 * used by drivers to map software speed values to hardware parameters. 2491 */ 2492 int 2493 ttspeedtab(int speed, const struct speedtab *table) 2494 { 2495 2496 for (; table->sp_speed != -1; table++) 2497 if (table->sp_speed == speed) 2498 return (table->sp_code); 2499 return (-1); 2500 } 2501 2502 /* 2503 * Set tty hi and low water marks. 2504 * 2505 * Try to arrange the dynamics so there's about one second 2506 * from hi to low water. 2507 */ 2508 void 2509 ttsetwater(struct tty *tp) 2510 { 2511 int cps, x; 2512 2513 /* XXX not yet KASSERT(mutex_owned(&tty_lock)); */ 2514 2515 #define CLAMP(x, h, l) ((x) > h ? h : ((x) < l) ? l : (x)) 2516 2517 cps = tp->t_ospeed / 10; 2518 tp->t_lowat = x = CLAMP(cps / 2, TTMAXLOWAT, TTMINLOWAT); 2519 x += cps; 2520 x = CLAMP(x, TTMAXHIWAT, TTMINHIWAT); 2521 tp->t_hiwat = roundup(x, TTROUND); 2522 #undef CLAMP 2523 } 2524 2525 /* 2526 * Prepare report on state of foreground process group. 2527 * Call with &proc_lock held. 2528 */ 2529 void 2530 ttygetinfo(struct tty *tp, int fromsig, char *buf, size_t bufsz) 2531 { 2532 struct lwp *l; 2533 struct proc *p, *pick = NULL; 2534 struct timeval utime, stime; 2535 int tmp; 2536 fixpt_t pctcpu = 0; 2537 const char *msg = NULL; 2538 char lmsg[100]; 2539 long rss; 2540 bool again = false; 2541 2542 KASSERT(mutex_owned(&proc_lock)); 2543 2544 *buf = '\0'; 2545 2546 retry: 2547 if (tp->t_session == NULL) 2548 msg = "not a controlling terminal\n"; 2549 else if (tp->t_pgrp == NULL) 2550 msg = "no foreground process group\n"; 2551 else if ((p = LIST_FIRST(&tp->t_pgrp->pg_members)) == NULL) 2552 msg = "empty foreground process group\n"; 2553 else { 2554 /* Pick interesting process. */ 2555 for (; p != NULL; p = LIST_NEXT(p, p_pglist)) { 2556 struct proc *oldpick; 2557 2558 if (pick == NULL) { 2559 pick = p; 2560 continue; 2561 } 2562 if (pick->p_lock < p->p_lock) { 2563 mutex_enter(pick->p_lock); 2564 mutex_enter(p->p_lock); 2565 } else if (pick->p_lock > p->p_lock) { 2566 mutex_enter(p->p_lock); 2567 mutex_enter(pick->p_lock); 2568 } else 2569 mutex_enter(p->p_lock); 2570 oldpick = pick; 2571 if (proc_compare_wrapper(pick, p)) 2572 pick = p; 2573 mutex_exit(p->p_lock); 2574 if (p->p_lock != oldpick->p_lock) 2575 mutex_exit(oldpick->p_lock); 2576 } 2577 2578 if (pick != NULL) { 2579 mutex_enter(pick->p_lock); 2580 if (P_ZOMBIE(pick)) { 2581 mutex_exit(pick->p_lock); 2582 pick = NULL; 2583 if (!again) { 2584 again = true; 2585 goto retry; 2586 } 2587 msg = "found only zombie processes\n"; 2588 } 2589 if (pick && fromsig && 2590 (SIGACTION_PS(pick->p_sigacts, SIGINFO).sa_flags & 2591 SA_NOKERNINFO)) { 2592 mutex_exit(pick->p_lock); 2593 return; 2594 } 2595 } 2596 } 2597 2598 /* Print load average. */ 2599 tmp = (averunnable.ldavg[0] * 100 + FSCALE / 2) >> FSHIFT; 2600 snprintf(lmsg, sizeof(lmsg), "load: %d.%02d ", tmp / 100, tmp % 100); 2601 strlcat(buf, lmsg, bufsz); 2602 2603 if (pick == NULL) { 2604 strlcat(buf, msg, bufsz); 2605 return; 2606 } 2607 2608 snprintf(lmsg, sizeof(lmsg), " cmd: %s %d [", pick->p_comm, 2609 pick->p_pid); 2610 strlcat(buf, lmsg, bufsz); 2611 2612 KASSERT(mutex_owned(pick->p_lock)); 2613 LIST_FOREACH(l, &pick->p_lwps, l_sibling) { 2614 const char *lp; 2615 lwp_lock(l); 2616 #ifdef LWP_PC 2617 #define FMT_RUN "%#"PRIxVADDR 2618 #define VAL_RUNNING (vaddr_t)LWP_PC(l) 2619 #define VAL_RUNABLE (vaddr_t)LWP_PC(l) 2620 #else 2621 #define FMT_RUN "%s" 2622 #define VAL_RUNNING "running" 2623 #define VAL_RUNABLE "runnable" 2624 #endif 2625 switch (l->l_stat) { 2626 case LSONPROC: 2627 snprintf(lmsg, sizeof(lmsg), FMT_RUN"/%d", VAL_RUNNING, 2628 cpu_index(l->l_cpu)); 2629 lp = lmsg; 2630 break; 2631 case LSRUN: 2632 snprintf(lmsg, sizeof(lmsg), FMT_RUN, VAL_RUNABLE); 2633 lp = lmsg; 2634 break; 2635 default: 2636 lp = l->l_wchan ? l->l_wmesg : "iowait"; 2637 break; 2638 } 2639 strlcat(buf, lp, bufsz); 2640 strlcat(buf, LIST_NEXT(l, l_sibling) != NULL ? " " : "] ", 2641 bufsz); 2642 pctcpu += l->l_pctcpu; 2643 lwp_unlock(l); 2644 } 2645 pctcpu += pick->p_pctcpu; 2646 calcru(pick, &utime, &stime, NULL, NULL); 2647 mutex_exit(pick->p_lock); 2648 2649 /* Round up and print user+system time, %CPU and RSS. */ 2650 utime.tv_usec += 5000; 2651 if (utime.tv_usec >= 1000000) { 2652 utime.tv_sec += 1; 2653 utime.tv_usec -= 1000000; 2654 } 2655 stime.tv_usec += 5000; 2656 if (stime.tv_usec >= 1000000) { 2657 stime.tv_sec += 1; 2658 stime.tv_usec -= 1000000; 2659 } 2660 #define pgtok(a) (((u_long) ((a) * PAGE_SIZE) / 1024)) 2661 tmp = (pctcpu * 10000 + FSCALE / 2) >> FSHIFT; 2662 if (pick->p_stat == SIDL || P_ZOMBIE(pick)) 2663 rss = 0; 2664 else 2665 rss = pgtok(vm_resident_count(pick->p_vmspace)); 2666 2667 snprintf(lmsg, sizeof(lmsg), "%ld.%02ldu %ld.%02lds %d%% %ldk", 2668 (long)utime.tv_sec, (long)utime.tv_usec / 10000, 2669 (long)stime.tv_sec, (long)stime.tv_usec / 10000, 2670 tmp / 100, rss); 2671 strlcat(buf, lmsg, bufsz); 2672 } 2673 2674 /* 2675 * Print report on state of foreground process group. 2676 * Call with tty_lock held. 2677 */ 2678 void 2679 ttyputinfo(struct tty *tp, char *buf) 2680 { 2681 2682 KASSERT(mutex_owned(&tty_lock)); 2683 2684 if (ttycheckoutq_wlock(tp, 0) == 0) 2685 return; 2686 ttyprintf_nolock(tp, "%s\n", buf); 2687 tp->t_rocount = 0; /* so pending input will be retyped if BS */ 2688 } 2689 2690 /* 2691 * Returns 1 if p2 has a better chance being the active foreground process 2692 * in a terminal instead of p1. 2693 */ 2694 static int 2695 proc_compare_wrapper(struct proc *p1, struct proc *p2) 2696 { 2697 lwp_t *l1, *l2; 2698 2699 KASSERT(mutex_owned(p1->p_lock)); 2700 KASSERT(mutex_owned(p2->p_lock)); 2701 2702 l1 = LIST_FIRST(&p1->p_lwps); 2703 l2 = LIST_FIRST(&p2->p_lwps); 2704 2705 return proc_compare(p1, l1, p2, l2); 2706 } 2707 2708 /* 2709 * Output char to tty; console putchar style. 2710 * Can be called with tty lock held through kprintf() machinery.. 2711 */ 2712 int 2713 tputchar(int c, int flags, struct tty *tp) 2714 { 2715 int r = 0; 2716 2717 if ((flags & NOLOCK) == 0) 2718 mutex_spin_enter(&tty_lock); 2719 if (!CONNECTED(tp)) { 2720 r = -1; 2721 goto out; 2722 } 2723 if (c == '\n') 2724 (void)ttyoutput('\r', tp); 2725 (void)ttyoutput(c, tp); 2726 ttstart(tp); 2727 out: 2728 if ((flags & NOLOCK) == 0) 2729 mutex_spin_exit(&tty_lock); 2730 return (r); 2731 } 2732 2733 /* 2734 * Sleep on chan, returning ERESTART if tty changed while we napped and 2735 * returning any errors (e.g. EINTR/EWOULDBLOCK) reported by 2736 * cv_timedwait(_sig). 2737 * If the tty is revoked, restarting a pending call will redo validation done 2738 * at the start of the call. 2739 * 2740 * Must be called with the tty lock held. 2741 */ 2742 int 2743 ttysleep(struct tty *tp, kcondvar_t *cv, bool catch_p, int timo) 2744 { 2745 int error; 2746 short gen; 2747 2748 KASSERT(mutex_owned(&tty_lock)); 2749 2750 gen = tp->t_gen; 2751 if (cv == NULL) 2752 error = kpause("ttypause", catch_p, timo, &tty_lock); 2753 else if (catch_p) 2754 error = cv_timedwait_sig(cv, &tty_lock, timo); 2755 else 2756 error = cv_timedwait(cv, &tty_lock, timo); 2757 if (error != 0) 2758 return (error); 2759 return (tp->t_gen == gen ? 0 : ERESTART); 2760 } 2761 2762 int 2763 ttypause(struct tty *tp, int timo) 2764 { 2765 int error; 2766 2767 error = ttysleep(tp, NULL, true, timo); 2768 if (error == EWOULDBLOCK) 2769 error = 0; 2770 return error; 2771 } 2772 2773 /* 2774 * Attach a tty to the tty list. 2775 * 2776 * This should be called ONLY once per real tty (including pty's). 2777 * eg, on the sparc, the keyboard and mouse have struct tty's that are 2778 * distinctly NOT usable as tty's, and thus should not be attached to 2779 * the ttylist. This is why this call is not done from tty_alloc(). 2780 * 2781 * Device drivers should attach tty's at a similar time that they are 2782 * allocated, or, for the case of statically allocated struct tty's 2783 * either in the attach or (first) open routine. 2784 */ 2785 void 2786 tty_attach(struct tty *tp) 2787 { 2788 2789 mutex_spin_enter(&tty_lock); 2790 TAILQ_INSERT_TAIL(&ttylist, tp, tty_link); 2791 ++tty_count; 2792 mutex_spin_exit(&tty_lock); 2793 } 2794 2795 /* 2796 * Remove a tty from the tty list. 2797 */ 2798 void 2799 tty_detach(struct tty *tp) 2800 { 2801 2802 mutex_spin_enter(&tty_lock); 2803 --tty_count; 2804 #ifdef DIAGNOSTIC 2805 if (tty_count < 0) 2806 panic("tty_detach: tty_count < 0"); 2807 #endif 2808 TAILQ_REMOVE(&ttylist, tp, tty_link); 2809 mutex_spin_exit(&tty_lock); 2810 } 2811 2812 /* 2813 * Allocate a tty structure and its associated buffers. 2814 */ 2815 struct tty * 2816 tty_alloc(void) 2817 { 2818 struct tty *tp; 2819 int i; 2820 2821 tp = kmem_zalloc(sizeof(*tp), KM_SLEEP); 2822 callout_init(&tp->t_rstrt_ch, 0); 2823 callout_setfunc(&tp->t_rstrt_ch, ttrstrt, tp); 2824 tp->t_qsize = tty_qsize; 2825 clalloc(&tp->t_rawq, tp->t_qsize, 1); 2826 cv_init(&tp->t_rawcv, "ttyraw"); 2827 cv_init(&tp->t_rawcvf, "ttyrawf"); 2828 clalloc(&tp->t_canq, tp->t_qsize, 1); 2829 cv_init(&tp->t_cancv, "ttycan"); 2830 cv_init(&tp->t_cancvf, "ttycanf"); 2831 /* output queue doesn't need quoting */ 2832 clalloc(&tp->t_outq, tp->t_qsize, 0); 2833 cv_init(&tp->t_outcv, "ttyout"); 2834 cv_init(&tp->t_outcvf, "ttyoutf"); 2835 /* Set default line discipline. */ 2836 tp->t_linesw = ttyldisc_default(); 2837 tp->t_dev = NODEV; 2838 selinit(&tp->t_rsel); 2839 selinit(&tp->t_wsel); 2840 for (i = 0; i < TTYSIG_COUNT; i++) { 2841 sigemptyset(&tp->t_sigs[i]); 2842 } 2843 2844 return tp; 2845 } 2846 2847 /* 2848 * Free a tty structure and its buffers. 2849 * 2850 * Be sure to call tty_detach() for any tty that has been 2851 * tty_attach()ed. 2852 */ 2853 void 2854 tty_free(struct tty *tp) 2855 { 2856 int i; 2857 2858 mutex_enter(&proc_lock); 2859 mutex_enter(&tty_lock); 2860 for (i = 0; i < TTYSIG_COUNT; i++) 2861 sigemptyset(&tp->t_sigs[i]); 2862 if (tp->t_sigcount != 0) 2863 TAILQ_REMOVE(&tty_sigqueue, tp, t_sigqueue); 2864 mutex_exit(&tty_lock); 2865 mutex_exit(&proc_lock); 2866 2867 callout_halt(&tp->t_rstrt_ch, NULL); 2868 callout_destroy(&tp->t_rstrt_ch); 2869 ttyldisc_release(tp->t_linesw); 2870 clfree(&tp->t_rawq); 2871 clfree(&tp->t_canq); 2872 clfree(&tp->t_outq); 2873 cv_destroy(&tp->t_rawcv); 2874 cv_destroy(&tp->t_rawcvf); 2875 cv_destroy(&tp->t_cancv); 2876 cv_destroy(&tp->t_cancvf); 2877 cv_destroy(&tp->t_outcv); 2878 cv_destroy(&tp->t_outcvf); 2879 seldestroy(&tp->t_rsel); 2880 seldestroy(&tp->t_wsel); 2881 kmem_free(tp, sizeof(*tp)); 2882 } 2883 2884 /* 2885 * ttyprintf_nolock: send a message to a specific tty, without locking. 2886 * 2887 * => should be used only by tty driver or anything that knows the 2888 * underlying tty will not be revoked(2)'d away. [otherwise, 2889 * use tprintf] 2890 */ 2891 static void 2892 ttyprintf_nolock(struct tty *tp, const char *fmt, ...) 2893 { 2894 va_list ap; 2895 2896 /* No mutex needed; going to process TTY. */ 2897 va_start(ap, fmt); 2898 kprintf(fmt, TOTTY|NOLOCK, tp, NULL, ap); 2899 va_end(ap); 2900 } 2901 2902 static int 2903 tty_listener_cb(kauth_cred_t cred, kauth_action_t action, void *cookie, 2904 void *arg0, void *arg1, void *arg2, void *arg3) 2905 { 2906 struct tty *tty; 2907 int result; 2908 2909 result = KAUTH_RESULT_DEFER; 2910 2911 if (action != KAUTH_DEVICE_TTY_OPEN) 2912 return result; 2913 2914 tty = arg0; 2915 2916 /* If it's not opened, we allow. */ 2917 if ((tty->t_state & TS_ISOPEN) == 0) 2918 result = KAUTH_RESULT_ALLOW; 2919 else { 2920 /* 2921 * If it's opened, we can only allow if it's not exclusively 2922 * opened; otherwise, that's a privileged operation and we 2923 * let the secmodel handle it. 2924 */ 2925 if ((tty->t_state & TS_XCLUDE) == 0) 2926 result = KAUTH_RESULT_ALLOW; 2927 } 2928 2929 return result; 2930 } 2931 2932 /* 2933 * Initialize the tty subsystem. 2934 */ 2935 void 2936 tty_init(void) 2937 { 2938 2939 mutex_init(&tty_lock, MUTEX_DEFAULT, IPL_VM); 2940 tty_sigsih = softint_establish(SOFTINT_CLOCK, ttysigintr, NULL); 2941 KASSERT(tty_sigsih != NULL); 2942 2943 tty_listener = kauth_listen_scope(KAUTH_SCOPE_DEVICE, 2944 tty_listener_cb, NULL); 2945 2946 sysctl_kern_tty_setup(); 2947 } 2948 2949 /* 2950 * Send a signal from a tty to its process group or session leader. 2951 * Handoff to the target is deferred to a soft interrupt. 2952 */ 2953 void 2954 ttysig(struct tty *tp, enum ttysigtype st, int sig) 2955 { 2956 sigset_t *sp; 2957 2958 /* XXXSMP not yet KASSERT(mutex_owned(&tty_lock)); */ 2959 2960 sp = &tp->t_sigs[st]; 2961 if (sigismember(sp, sig)) 2962 return; 2963 sigaddset(sp, sig); 2964 if (tp->t_sigcount++ == 0) 2965 TAILQ_INSERT_TAIL(&tty_sigqueue, tp, t_sigqueue); 2966 softint_schedule(tty_sigsih); 2967 } 2968 2969 /* 2970 * Deliver deferred signals from ttys. Note that the process groups 2971 * and sessions associated with the ttys may have changed from when 2972 * the signal was originally sent, but in practice it should not matter. 2973 * For signals produced as a result of a syscall, the soft interrupt 2974 * will fire before the syscall returns to the user. 2975 */ 2976 static void 2977 ttysigintr(void *cookie) 2978 { 2979 struct tty *tp; 2980 enum ttysigtype st; 2981 struct pgrp *pgrp; 2982 struct session *sess; 2983 int sig, lflag; 2984 char infobuf[200]; 2985 2986 mutex_enter(&proc_lock); 2987 mutex_spin_enter(&tty_lock); 2988 while ((tp = TAILQ_FIRST(&tty_sigqueue)) != NULL) { 2989 KASSERT(tp->t_sigcount > 0); 2990 for (st = TTYSIG_PG1; st < TTYSIG_COUNT; st++) { 2991 if ((sig = firstsig(&tp->t_sigs[st])) != 0) 2992 break; 2993 } 2994 KASSERT(st < TTYSIG_COUNT); 2995 sigdelset(&tp->t_sigs[st], sig); 2996 if (--tp->t_sigcount == 0) 2997 TAILQ_REMOVE(&tty_sigqueue, tp, t_sigqueue); 2998 pgrp = tp->t_pgrp; 2999 sess = tp->t_session; 3000 lflag = tp->t_lflag; 3001 if (sig == SIGINFO) { 3002 if (ISSET(tp->t_state, TS_SIGINFO)) { 3003 /* Via ioctl: ignore tty option. */ 3004 tp->t_state &= ~TS_SIGINFO; 3005 lflag |= ISIG; 3006 } 3007 if (!ISSET(lflag, NOKERNINFO)) { 3008 mutex_spin_exit(&tty_lock); 3009 ttygetinfo(tp, 1, infobuf, sizeof(infobuf)); 3010 mutex_spin_enter(&tty_lock); 3011 ttyputinfo(tp, infobuf); 3012 } 3013 if (!ISSET(lflag, ISIG)) 3014 continue; 3015 } 3016 mutex_spin_exit(&tty_lock); 3017 KASSERT(sig != 0); 3018 switch (st) { 3019 case TTYSIG_PG1: 3020 if (pgrp != NULL) 3021 pgsignal(pgrp, sig, 1); 3022 break; 3023 case TTYSIG_PG2: 3024 if (pgrp != NULL) 3025 pgsignal(pgrp, sig, sess != NULL); 3026 break; 3027 case TTYSIG_LEADER: 3028 if (sess != NULL && sess->s_leader != NULL) 3029 psignal(sess->s_leader, sig); 3030 break; 3031 default: 3032 /* NOTREACHED */ 3033 break; 3034 } 3035 mutex_spin_enter(&tty_lock); 3036 } 3037 mutex_spin_exit(&tty_lock); 3038 mutex_exit(&proc_lock); 3039 } 3040 3041 unsigned char 3042 tty_getctrlchar(struct tty *tp, unsigned which) 3043 { 3044 KASSERT(which < NCCS); 3045 return tp->t_cc[which]; 3046 } 3047 3048 void 3049 tty_setctrlchar(struct tty *tp, unsigned which, unsigned char val) 3050 { 3051 KASSERT(which < NCCS); 3052 tp->t_cc[which] = val; 3053 } 3054 3055 int 3056 tty_try_xonxoff(struct tty *tp, unsigned char c) 3057 { 3058 const struct cdevsw *cdev; 3059 3060 if (tp->t_iflag & IXON) { 3061 if (c == tp->t_cc[VSTOP] && tp->t_cc[VSTOP] != _POSIX_VDISABLE) { 3062 if ((tp->t_state & TS_TTSTOP) == 0) { 3063 tp->t_state |= TS_TTSTOP; 3064 cdev = cdevsw_lookup(tp->t_dev); 3065 if (cdev != NULL) 3066 (*cdev->d_stop)(tp, 0); 3067 } 3068 return 0; 3069 } 3070 if (c == tp->t_cc[VSTART] && tp->t_cc[VSTART] != _POSIX_VDISABLE) { 3071 tp->t_state &= ~TS_TTSTOP; 3072 if (tp->t_oproc != NULL) { 3073 mutex_spin_enter(&tty_lock); /* XXX */ 3074 (*tp->t_oproc)(tp); 3075 mutex_spin_exit(&tty_lock); /* XXX */ 3076 } 3077 return 0; 3078 } 3079 } 3080 return EAGAIN; 3081 } 3082
Indexes created Mon Sep 22 21:09:42 GMT 2025