1 /* $NetBSD: tty.c,v 1.274 2016/10/01 04:42:54 christos Exp $ */ 2 3 /*- 4 * Copyright (c) 2008 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 1.274 2016/10/01 04:42:54 christos 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> 101 102 #ifdef COMPAT_60 103 #include <compat/sys/ttycom.h> 104 #endif /* COMPAT_60 */ 105 106 static int ttnread(struct tty *); 107 static void ttyblock(struct tty *); 108 static void ttyecho(int, struct tty *); 109 static void ttyrubo(struct tty *, int); 110 static void ttyprintf_nolock(struct tty *, const char *fmt, ...) 111 __printflike(2, 3); 112 static int proc_compare_wrapper(struct proc *, struct proc *); 113 static void ttysigintr(void *); 114 115 /* Symbolic sleep message strings. */ 116 const char ttclos[] = "ttycls"; 117 const char ttopen[] = "ttyopn"; 118 const char ttybg[] = "ttybg"; 119 const char ttyin[] = "ttyin"; 120 const char ttyout[] = "ttyout"; 121 122 /* 123 * Used to determine whether we still have a connection. This is true in 124 * one of 3 cases: 125 * 1) We have carrier. 126 * 2) It's a locally attached terminal, and we are therefore ignoring carrier. 127 * 3) We're using a flow control mechanism that overloads the carrier signal. 128 */ 129 #define CONNECTED(tp) (ISSET(tp->t_state, TS_CARR_ON) || \ 130 ISSET(tp->t_cflag, CLOCAL | MDMBUF)) 131 132 /* 133 * Table with character classes and parity. The 8th bit indicates parity, 134 * the 7th bit indicates the character is an alphameric or underscore (for 135 * ALTWERASE), and the low 6 bits indicate delay type. If the low 6 bits 136 * are 0 then the character needs no special processing on output; classes 137 * other than 0 might be translated or (not currently) require delays. 138 */ 139 #define E 0x00 /* Even parity. */ 140 #define O 0x80 /* Odd parity. */ 141 #define PARITY(c) (char_type[c] & O) 142 143 #define ALPHA 0x40 /* Alpha or underscore. */ 144 #define ISALPHA(c) (char_type[(c) & TTY_CHARMASK] & ALPHA) 145 146 #define CCLASSMASK 0x3f 147 #define CCLASS(c) (char_type[c] & CCLASSMASK) 148 149 #define BS BACKSPACE 150 #define CC CONTROL 151 #define CR RETURN 152 #define NA ORDINARY | ALPHA 153 #define NL NEWLINE 154 #define NO ORDINARY 155 #define TB TAB 156 #define VT VTAB 157 158 unsigned char const char_type[] = { 159 E|CC, O|CC, O|CC, E|CC, O|CC, E|CC, E|CC, O|CC, /* nul - bel */ 160 O|BS, E|TB, E|NL, O|CC, E|VT, O|CR, O|CC, E|CC, /* bs - si */ 161 O|CC, E|CC, E|CC, O|CC, E|CC, O|CC, O|CC, E|CC, /* dle - etb */ 162 E|CC, O|CC, O|CC, E|CC, O|CC, E|CC, E|CC, O|CC, /* can - us */ 163 O|NO, E|NO, E|NO, O|NO, E|NO, O|NO, O|NO, E|NO, /* sp - ' */ 164 E|NO, O|NO, O|NO, E|NO, O|NO, E|NO, E|NO, O|NO, /* ( - / */ 165 E|NA, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* 0 - 7 */ 166 O|NA, E|NA, E|NO, O|NO, E|NO, O|NO, O|NO, E|NO, /* 8 - ? */ 167 O|NO, E|NA, E|NA, O|NA, E|NA, O|NA, O|NA, E|NA, /* @ - G */ 168 E|NA, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* H - O */ 169 E|NA, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* P - W */ 170 O|NA, E|NA, E|NA, O|NO, E|NO, O|NO, O|NO, O|NA, /* X - _ */ 171 E|NO, O|NA, O|NA, E|NA, O|NA, E|NA, E|NA, O|NA, /* ` - g */ 172 O|NA, E|NA, E|NA, O|NA, E|NA, O|NA, O|NA, E|NA, /* h - o */ 173 O|NA, E|NA, E|NA, O|NA, E|NA, O|NA, O|NA, E|NA, /* p - w */ 174 E|NA, O|NA, O|NA, E|NO, O|NO, E|NO, E|NO, O|CC, /* x - del */ 175 /* 176 * Meta chars; should be settable per character set; 177 * for now, treat them all as normal characters. 178 */ 179 NA, NA, NA, NA, NA, NA, NA, NA, 180 NA, NA, NA, NA, NA, NA, NA, NA, 181 NA, NA, NA, NA, NA, NA, NA, NA, 182 NA, NA, NA, NA, NA, NA, NA, NA, 183 NA, NA, NA, NA, NA, NA, NA, NA, 184 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 }; 196 #undef BS 197 #undef CC 198 #undef CR 199 #undef NA 200 #undef NL 201 #undef NO 202 #undef TB 203 #undef VT 204 205 static struct ttylist_head tty_sigqueue = TAILQ_HEAD_INITIALIZER(tty_sigqueue); 206 static void *tty_sigsih; 207 208 struct ttylist_head ttylist = TAILQ_HEAD_INITIALIZER(ttylist); 209 int tty_count; 210 kmutex_t tty_lock; 211 krwlock_t ttcompat_lock; 212 int (*ttcompatvec)(struct tty *, u_long, void *, int, struct lwp *); 213 214 uint64_t tk_cancc; 215 uint64_t tk_nin; 216 uint64_t tk_nout; 217 uint64_t tk_rawcc; 218 219 static kauth_listener_t tty_listener; 220 221 #define TTY_MINQSIZE 0x00400 222 #define TTY_MAXQSIZE 0x10000 223 int tty_qsize = TTY_MINQSIZE; 224 225 static int 226 tty_get_qsize(int *qsize, int newsize) 227 { 228 newsize = 1 << ilog2(newsize); /* Make it a power of two */ 229 230 if (newsize < TTY_MINQSIZE || newsize > TTY_MAXQSIZE) 231 return EINVAL; 232 233 *qsize = newsize; 234 return 0; 235 } 236 237 static int 238 tty_set_qsize(struct tty *tp, int newsize) 239 { 240 struct clist rawq, canq, outq; 241 struct clist orawq, ocanq, ooutq; 242 243 clalloc(&rawq, newsize, 1); 244 clalloc(&canq, newsize, 1); 245 clalloc(&outq, newsize, 0); 246 247 mutex_spin_enter(&tty_lock); 248 249 if (tp->t_outq.c_cc != 0) { 250 mutex_spin_exit(&tty_lock); 251 clfree(&rawq); 252 clfree(&canq); 253 clfree(&outq); 254 return EBUSY; 255 } 256 257 orawq = tp->t_rawq; 258 ocanq = tp->t_canq; 259 ooutq = tp->t_outq; 260 261 tp->t_qsize = newsize; 262 tp->t_rawq = rawq; 263 tp->t_canq = canq; 264 tp->t_outq = outq; 265 266 ttsetwater(tp); 267 268 mutex_spin_exit(&tty_lock); 269 270 clfree(&orawq); 271 clfree(&ocanq); 272 clfree(&ooutq); 273 274 return 0; 275 } 276 277 static int 278 sysctl_kern_tty_qsize(SYSCTLFN_ARGS) 279 { 280 int newsize; 281 int error; 282 struct sysctlnode node; 283 node = *rnode; 284 node.sysctl_data = &newsize; 285 286 newsize = tty_qsize; 287 error = sysctl_lookup(SYSCTLFN_CALL(&node)); 288 if (error || newp == NULL) 289 return error; 290 291 292 return tty_get_qsize(&tty_qsize, newsize); 293 } 294 295 static void 296 sysctl_kern_tty_setup(void) 297 { 298 const struct sysctlnode *rnode, *cnode; 299 struct sysctllog *kern_tkstat_sysctllog, *kern_tty_sysctllog; 300 301 kern_tkstat_sysctllog = NULL; 302 sysctl_createv(&kern_tkstat_sysctllog, 0, NULL, NULL, 303 CTLFLAG_PERMANENT, 304 CTLTYPE_NODE, "tkstat", 305 SYSCTL_DESCR("Number of characters sent and and " 306 "received on ttys"), 307 NULL, 0, NULL, 0, 308 CTL_KERN, KERN_TKSTAT, CTL_EOL); 309 310 sysctl_createv(&kern_tkstat_sysctllog, 0, NULL, NULL, 311 CTLFLAG_PERMANENT, 312 CTLTYPE_QUAD, "nin", 313 SYSCTL_DESCR("Total number of tty input characters"), 314 NULL, 0, &tk_nin, 0, 315 CTL_KERN, KERN_TKSTAT, KERN_TKSTAT_NIN, CTL_EOL); 316 sysctl_createv(&kern_tkstat_sysctllog, 0, NULL, NULL, 317 CTLFLAG_PERMANENT, 318 CTLTYPE_QUAD, "nout", 319 SYSCTL_DESCR("Total number of tty output characters"), 320 NULL, 0, &tk_nout, 0, 321 CTL_KERN, KERN_TKSTAT, KERN_TKSTAT_NOUT, CTL_EOL); 322 sysctl_createv(&kern_tkstat_sysctllog, 0, NULL, NULL, 323 CTLFLAG_PERMANENT, 324 CTLTYPE_QUAD, "cancc", 325 SYSCTL_DESCR("Number of canonical tty input characters"), 326 NULL, 0, &tk_cancc, 0, 327 CTL_KERN, KERN_TKSTAT, KERN_TKSTAT_CANCC, CTL_EOL); 328 sysctl_createv(&kern_tkstat_sysctllog, 0, NULL, NULL, 329 CTLFLAG_PERMANENT, 330 CTLTYPE_QUAD, "rawcc", 331 SYSCTL_DESCR("Number of raw tty input characters"), 332 NULL, 0, &tk_rawcc, 0, 333 CTL_KERN, KERN_TKSTAT, KERN_TKSTAT_RAWCC, CTL_EOL); 334 335 kern_tty_sysctllog = NULL; 336 sysctl_createv(&kern_tty_sysctllog, 0, NULL, &rnode, 337 CTLFLAG_PERMANENT, 338 CTLTYPE_NODE, "tty", NULL, 339 NULL, 0, NULL, 0, 340 CTL_KERN, CTL_CREATE, CTL_EOL); 341 sysctl_createv(&kern_tty_sysctllog, 0, &rnode, &cnode, 342 CTLFLAG_PERMANENT | CTLFLAG_READWRITE, 343 CTLTYPE_INT, "qsize", 344 SYSCTL_DESCR("TTY input and output queue size"), 345 sysctl_kern_tty_qsize, 0, &tty_qsize, 0, 346 CTL_CREATE, CTL_EOL); 347 } 348 349 int 350 ttyopen(struct tty *tp, int dialout, int nonblock) 351 { 352 int error; 353 354 error = 0; 355 356 mutex_spin_enter(&tty_lock); 357 358 if (dialout) { 359 /* 360 * If the device is already open for non-dialout, fail. 361 * Otherwise, set TS_DIALOUT to block any pending non-dialout 362 * opens. 363 */ 364 if (ISSET(tp->t_state, TS_ISOPEN) && 365 !ISSET(tp->t_state, TS_DIALOUT)) { 366 error = EBUSY; 367 goto out; 368 } 369 SET(tp->t_state, TS_DIALOUT); 370 } else { 371 if (!nonblock) { 372 /* 373 * Wait for carrier. Also wait for any dialout 374 * processes to close the tty first. 375 */ 376 while (ISSET(tp->t_state, TS_DIALOUT) || 377 !CONNECTED(tp)) { 378 tp->t_wopen++; 379 error = ttysleep(tp, &tp->t_rawcv, true, 0); 380 tp->t_wopen--; 381 if (error) 382 goto out; 383 } 384 } else { 385 /* 386 * Don't allow a non-blocking non-dialout open if the 387 * device is already open for dialout. 388 */ 389 if (ISSET(tp->t_state, TS_DIALOUT)) { 390 error = EBUSY; 391 goto out; 392 } 393 } 394 } 395 396 out: 397 mutex_spin_exit(&tty_lock); 398 return (error); 399 } 400 401 /* 402 * Initial open of tty, or (re)entry to standard tty line discipline. 403 */ 404 int 405 ttylopen(dev_t device, struct tty *tp) 406 { 407 408 mutex_spin_enter(&tty_lock); 409 tp->t_dev = device; 410 if (!ISSET(tp->t_state, TS_ISOPEN)) { 411 SET(tp->t_state, TS_ISOPEN); 412 memset(&tp->t_winsize, 0, sizeof(tp->t_winsize)); 413 tp->t_flags = 0; 414 } 415 mutex_spin_exit(&tty_lock); 416 if (tp->t_qsize != tty_qsize) 417 tty_set_qsize(tp, tty_qsize); 418 return (0); 419 } 420 421 /* 422 * Handle close() on a tty line: flush and set to initial state, 423 * bumping generation number so that pending read/write calls 424 * can detect recycling of the tty. 425 */ 426 int 427 ttyclose(struct tty *tp) 428 { 429 extern struct tty *constty; /* Temporary virtual console. */ 430 struct session *sess; 431 432 mutex_spin_enter(&tty_lock); 433 434 if (constty == tp) 435 constty = NULL; 436 437 ttyflush(tp, FREAD | FWRITE); 438 439 tp->t_gen++; 440 tp->t_pgrp = NULL; 441 tp->t_state = 0; 442 sess = tp->t_session; 443 tp->t_session = NULL; 444 445 mutex_spin_exit(&tty_lock); 446 447 if (sess != NULL) { 448 mutex_enter(proc_lock); 449 /* Releases proc_lock. */ 450 proc_sessrele(sess); 451 } 452 return (0); 453 } 454 455 #define FLUSHQ(q) { \ 456 if ((q)->c_cc) \ 457 ndflush(q, (q)->c_cc); \ 458 } 459 460 /* 461 * This macro is used in canonical mode input processing, where a read 462 * request shall not return unless a 'line delimiter' ('\n') or 'break' 463 * (EOF, EOL, EOL2) character (or a signal) has been received. As EOL2 464 * is an extension to the POSIX.1 defined set of special characters, 465 * recognize it only if IEXTEN is set in the set of local flags. 466 */ 467 #define TTBREAKC(c, lflg) \ 468 ((c) == '\n' || (((c) == cc[VEOF] || (c) == cc[VEOL] || \ 469 ((c) == cc[VEOL2] && ISSET(lflg, IEXTEN))) && (c) != _POSIX_VDISABLE)) 470 471 472 473 /* 474 * ttyinput() helper. 475 * Call with the tty lock held. 476 */ 477 /* XXX static */ int 478 ttyinput_wlock(int c, struct tty *tp) 479 { 480 int iflag, lflag, i, error; 481 u_char *cc; 482 483 KASSERT(mutex_owned(&tty_lock)); 484 485 /* 486 * If input is pending take it first. 487 */ 488 lflag = tp->t_lflag; 489 if (ISSET(lflag, PENDIN)) 490 ttypend(tp); 491 /* 492 * Gather stats. 493 */ 494 if (ISSET(lflag, ICANON)) { 495 ++tk_cancc; 496 ++tp->t_cancc; 497 } else { 498 ++tk_rawcc; 499 ++tp->t_rawcc; 500 } 501 ++tk_nin; 502 503 cc = tp->t_cc; 504 505 /* 506 * Handle exceptional conditions (break, parity, framing). 507 */ 508 iflag = tp->t_iflag; 509 if ((error = (ISSET(c, TTY_ERRORMASK))) != 0) { 510 CLR(c, TTY_ERRORMASK); 511 if (ISSET(error, TTY_FE) && c == 0) { /* Break. */ 512 if (ISSET(iflag, IGNBRK)) 513 return (0); 514 else if (ISSET(iflag, BRKINT)) { 515 ttyflush(tp, FREAD | FWRITE); 516 ttysig(tp, TTYSIG_PG1, SIGINT); 517 return (0); 518 } else if (ISSET(iflag, PARMRK)) 519 goto parmrk; 520 } else if ((ISSET(error, TTY_PE) && ISSET(iflag, INPCK)) || 521 ISSET(error, TTY_FE)) { 522 if (ISSET(iflag, IGNPAR)) 523 return (0); 524 else if (ISSET(iflag, PARMRK)) { 525 parmrk: (void)putc(0377 | TTY_QUOTE, &tp->t_rawq); 526 (void)putc(0 | TTY_QUOTE, &tp->t_rawq); 527 (void)putc(c | TTY_QUOTE, &tp->t_rawq); 528 return (0); 529 } else 530 c = 0; 531 } 532 } else if (c == 0377 && 533 ISSET(iflag, ISTRIP|IGNPAR|INPCK|PARMRK) == (INPCK|PARMRK)) { 534 /* "Escape" a valid character of '\377'. */ 535 (void)putc(0377 | TTY_QUOTE, &tp->t_rawq); 536 (void)putc(0377 | TTY_QUOTE, &tp->t_rawq); 537 goto endcase; 538 } 539 540 /* 541 * In tandem mode, check high water mark. 542 */ 543 if (ISSET(iflag, IXOFF) || ISSET(tp->t_cflag, CHWFLOW)) 544 ttyblock(tp); 545 if (!ISSET(tp->t_state, TS_TYPEN) && ISSET(iflag, ISTRIP)) 546 CLR(c, 0x80); 547 if (!ISSET(lflag, EXTPROC)) { 548 /* 549 * Check for literal nexting very first 550 */ 551 if (ISSET(tp->t_state, TS_LNCH)) { 552 SET(c, TTY_QUOTE); 553 CLR(tp->t_state, TS_LNCH); 554 } 555 /* 556 * Scan for special characters. This code 557 * is really just a big case statement with 558 * non-constant cases. The bottom of the 559 * case statement is labeled ``endcase'', so goto 560 * it after a case match, or similar. 561 */ 562 563 /* 564 * Control chars which aren't controlled 565 * by ICANON, ISIG, or IXON. 566 */ 567 if (ISSET(lflag, IEXTEN)) { 568 if (CCEQ(cc[VLNEXT], c)) { 569 if (ISSET(lflag, ECHO)) { 570 if (ISSET(lflag, ECHOE)) { 571 (void)ttyoutput('^', tp); 572 (void)ttyoutput('\b', tp); 573 } else 574 ttyecho(c, tp); 575 } 576 SET(tp->t_state, TS_LNCH); 577 goto endcase; 578 } 579 if (CCEQ(cc[VDISCARD], c)) { 580 if (ISSET(lflag, FLUSHO)) 581 CLR(tp->t_lflag, FLUSHO); 582 else { 583 ttyflush(tp, FWRITE); 584 ttyecho(c, tp); 585 if (tp->t_rawq.c_cc + tp->t_canq.c_cc) 586 ttyretype(tp); 587 SET(tp->t_lflag, FLUSHO); 588 } 589 goto startoutput; 590 } 591 } 592 /* 593 * Signals. 594 */ 595 if (ISSET(lflag, ISIG)) { 596 if (CCEQ(cc[VINTR], c) || CCEQ(cc[VQUIT], c)) { 597 if (!ISSET(lflag, NOFLSH)) 598 ttyflush(tp, FREAD | FWRITE); 599 ttyecho(c, tp); 600 ttysig(tp, TTYSIG_PG1, CCEQ(cc[VINTR], c) ? 601 SIGINT : SIGQUIT); 602 goto endcase; 603 } 604 if (CCEQ(cc[VSUSP], c)) { 605 if (!ISSET(lflag, NOFLSH)) 606 ttyflush(tp, FREAD); 607 ttyecho(c, tp); 608 ttysig(tp, TTYSIG_PG1, SIGTSTP); 609 goto endcase; 610 } 611 } 612 /* 613 * Handle start/stop characters. 614 */ 615 if (ISSET(iflag, IXON)) { 616 if (CCEQ(cc[VSTOP], c)) { 617 if (!ISSET(tp->t_state, TS_TTSTOP)) { 618 SET(tp->t_state, TS_TTSTOP); 619 cdev_stop(tp, 0); 620 return (0); 621 } 622 if (!CCEQ(cc[VSTART], c)) 623 return (0); 624 /* 625 * if VSTART == VSTOP then toggle 626 */ 627 goto endcase; 628 } 629 if (CCEQ(cc[VSTART], c)) 630 goto restartoutput; 631 } 632 /* 633 * IGNCR, ICRNL, & INLCR 634 */ 635 if (c == '\r') { 636 if (ISSET(iflag, IGNCR)) 637 goto endcase; 638 else if (ISSET(iflag, ICRNL)) 639 c = '\n'; 640 } else if (c == '\n' && ISSET(iflag, INLCR)) 641 c = '\r'; 642 } 643 if (!ISSET(lflag, EXTPROC) && ISSET(lflag, ICANON)) { 644 /* 645 * From here on down canonical mode character 646 * processing takes place. 647 */ 648 /* 649 * erase (^H / ^?) 650 */ 651 if (CCEQ(cc[VERASE], c)) { 652 if (tp->t_rawq.c_cc) 653 ttyrub(unputc(&tp->t_rawq), tp); 654 goto endcase; 655 } 656 /* 657 * kill (^U) 658 */ 659 if (CCEQ(cc[VKILL], c)) { 660 if (ISSET(lflag, ECHOKE) && 661 tp->t_rawq.c_cc == tp->t_rocount && 662 !ISSET(lflag, ECHOPRT)) 663 while (tp->t_rawq.c_cc) 664 ttyrub(unputc(&tp->t_rawq), tp); 665 else { 666 ttyecho(c, tp); 667 if (ISSET(lflag, ECHOK) || 668 ISSET(lflag, ECHOKE)) 669 ttyecho('\n', tp); 670 FLUSHQ(&tp->t_rawq); 671 tp->t_rocount = 0; 672 } 673 CLR(tp->t_state, TS_LOCAL); 674 goto endcase; 675 } 676 /* 677 * Extensions to the POSIX.1 GTI set of functions. 678 */ 679 if (ISSET(lflag, IEXTEN)) { 680 /* 681 * word erase (^W) 682 */ 683 if (CCEQ(cc[VWERASE], c)) { 684 int alt = ISSET(lflag, ALTWERASE); 685 int ctype; 686 687 /* 688 * erase whitespace 689 */ 690 while ((c = unputc(&tp->t_rawq)) == ' ' || 691 c == '\t') 692 ttyrub(c, tp); 693 if (c == -1) 694 goto endcase; 695 /* 696 * erase last char of word and remember the 697 * next chars type (for ALTWERASE) 698 */ 699 ttyrub(c, tp); 700 c = unputc(&tp->t_rawq); 701 if (c == -1) 702 goto endcase; 703 if (c == ' ' || c == '\t') { 704 (void)putc(c, &tp->t_rawq); 705 goto endcase; 706 } 707 ctype = ISALPHA(c); 708 /* 709 * erase rest of word 710 */ 711 do { 712 ttyrub(c, tp); 713 c = unputc(&tp->t_rawq); 714 if (c == -1) 715 goto endcase; 716 } while (c != ' ' && c != '\t' && 717 (alt == 0 || ISALPHA(c) == ctype)); 718 (void)putc(c, &tp->t_rawq); 719 goto endcase; 720 } 721 /* 722 * reprint line (^R) 723 */ 724 if (CCEQ(cc[VREPRINT], c)) { 725 ttyretype(tp); 726 goto endcase; 727 } 728 /* 729 * ^T - kernel info and generate SIGINFO 730 */ 731 if (CCEQ(cc[VSTATUS], c)) { 732 ttysig(tp, TTYSIG_PG1, SIGINFO); 733 goto endcase; 734 } 735 } 736 } 737 /* 738 * Check for input buffer overflow 739 */ 740 if (tp->t_rawq.c_cc + tp->t_canq.c_cc >= TTYHOG) { 741 if (ISSET(iflag, IMAXBEL)) { 742 if (tp->t_outq.c_cc < tp->t_hiwat) 743 (void)ttyoutput(CTRL('g'), tp); 744 } else 745 ttyflush(tp, FREAD | FWRITE); 746 goto endcase; 747 } 748 /* 749 * Put data char in q for user and 750 * wakeup on seeing a line delimiter. 751 */ 752 if (putc(c, &tp->t_rawq) >= 0) { 753 if (!ISSET(lflag, ICANON)) { 754 ttwakeup(tp); 755 ttyecho(c, tp); 756 goto endcase; 757 } 758 if (TTBREAKC(c, lflag)) { 759 tp->t_rocount = 0; 760 catq(&tp->t_rawq, &tp->t_canq); 761 ttwakeup(tp); 762 } else if (tp->t_rocount++ == 0) 763 tp->t_rocol = tp->t_column; 764 if (ISSET(tp->t_state, TS_ERASE)) { 765 /* 766 * end of prterase \.../ 767 */ 768 CLR(tp->t_state, TS_ERASE); 769 (void)ttyoutput('/', tp); 770 } 771 i = tp->t_column; 772 ttyecho(c, tp); 773 if (CCEQ(cc[VEOF], c) && ISSET(lflag, ECHO)) { 774 /* 775 * Place the cursor over the '^' of the ^D. 776 */ 777 i = min(2, tp->t_column - i); 778 while (i > 0) { 779 (void)ttyoutput('\b', tp); 780 i--; 781 } 782 } 783 } 784 endcase: 785 /* 786 * IXANY means allow any character to restart output. 787 */ 788 if (ISSET(tp->t_state, TS_TTSTOP) && 789 !ISSET(iflag, IXANY) && cc[VSTART] != cc[VSTOP]) { 790 return (0); 791 } 792 restartoutput: 793 CLR(tp->t_lflag, FLUSHO); 794 CLR(tp->t_state, TS_TTSTOP); 795 startoutput: 796 return (ttstart(tp)); 797 } 798 799 /* 800 * Process input of a single character received on a tty. 801 * 802 * XXX - this is a hack, all drivers must changed to acquire the 803 * lock before calling linesw->l_rint() 804 */ 805 int 806 ttyinput(int c, struct tty *tp) 807 { 808 int error; 809 810 /* 811 * Unless the receiver is enabled, drop incoming data. 812 */ 813 if (!ISSET(tp->t_cflag, CREAD)) 814 return (0); 815 816 mutex_spin_enter(&tty_lock); 817 error = ttyinput_wlock(c, tp); 818 mutex_spin_exit(&tty_lock); 819 820 return (error); 821 } 822 823 /* 824 * Output a single character on a tty, doing output processing 825 * as needed (expanding tabs, newline processing, etc.). 826 * Returns < 0 if succeeds, otherwise returns char to resend. 827 * Must be recursive. 828 * 829 * Call with tty lock held. 830 */ 831 int 832 ttyoutput(int c, struct tty *tp) 833 { 834 long oflag; 835 int col, notout; 836 837 KASSERT(mutex_owned(&tty_lock)); 838 839 oflag = tp->t_oflag; 840 if (!ISSET(oflag, OPOST)) { 841 tk_nout++; 842 tp->t_outcc++; 843 if (!ISSET(tp->t_lflag, FLUSHO) && putc(c, &tp->t_outq)) 844 return (c); 845 return (-1); 846 } 847 /* 848 * Do tab expansion if OXTABS is set. Special case if we do external 849 * processing, we don't do the tab expansion because we'll probably 850 * get it wrong. If tab expansion needs to be done, let it happen 851 * externally. 852 */ 853 CLR(c, ~TTY_CHARMASK); 854 if (c == '\t' && 855 ISSET(oflag, OXTABS) && !ISSET(tp->t_lflag, EXTPROC)) { 856 c = 8 - (tp->t_column & 7); 857 if (ISSET(tp->t_lflag, FLUSHO)) { 858 notout = 0; 859 } else { 860 notout = b_to_q(" ", c, &tp->t_outq); 861 c -= notout; 862 tk_nout += c; 863 tp->t_outcc += c; 864 } 865 tp->t_column += c; 866 return (notout ? '\t' : -1); 867 } 868 if (c == CEOT && ISSET(oflag, ONOEOT)) 869 return (-1); 870 871 /* 872 * Newline translation: if ONLCR is set, 873 * translate newline into "\r\n". 874 */ 875 if (c == '\n' && ISSET(tp->t_oflag, ONLCR)) { 876 tk_nout++; 877 tp->t_outcc++; 878 if (!ISSET(tp->t_lflag, FLUSHO) && putc('\r', &tp->t_outq)) 879 return (c); 880 } 881 /* If OCRNL is set, translate "\r" into "\n". */ 882 else if (c == '\r' && ISSET(tp->t_oflag, OCRNL)) 883 c = '\n'; 884 /* If ONOCR is set, don't transmit CRs when on column 0. */ 885 else if (c == '\r' && ISSET(tp->t_oflag, ONOCR) && tp->t_column == 0) 886 return (-1); 887 888 tk_nout++; 889 tp->t_outcc++; 890 if (!ISSET(tp->t_lflag, FLUSHO) && putc(c, &tp->t_outq)) 891 return (c); 892 893 col = tp->t_column; 894 switch (CCLASS(c)) { 895 case BACKSPACE: 896 if (col > 0) 897 --col; 898 break; 899 case CONTROL: 900 break; 901 case NEWLINE: 902 if (ISSET(tp->t_oflag, ONLCR | ONLRET)) 903 col = 0; 904 break; 905 case RETURN: 906 col = 0; 907 break; 908 case ORDINARY: 909 ++col; 910 break; 911 case TAB: 912 col = (col + 8) & ~7; 913 break; 914 } 915 tp->t_column = col; 916 return (-1); 917 } 918 919 /* 920 * Ioctls for all tty devices. Called after line-discipline specific ioctl 921 * has been called to do discipline-specific functions and/or reject any 922 * of these ioctl commands. 923 */ 924 /* ARGSUSED */ 925 int 926 ttioctl(struct tty *tp, u_long cmd, void *data, int flag, struct lwp *l) 927 { 928 extern struct tty *constty; /* Temporary virtual console. */ 929 struct proc *p; 930 struct linesw *lp; 931 int s, error; 932 struct pathbuf *pb; 933 struct nameidata nd; 934 char infobuf[200]; 935 936 KASSERT(l != NULL); 937 p = l->l_proc; 938 939 /* If the ioctl involves modification, hang if in the background. */ 940 switch (cmd) { 941 case TIOCFLUSH: 942 case TIOCDRAIN: 943 case TIOCSBRK: 944 case TIOCCBRK: 945 case TIOCSTART: 946 case TIOCSETA: 947 case TIOCSETD: 948 case TIOCSLINED: 949 case TIOCSETAF: 950 case TIOCSETAW: 951 #ifdef notdef 952 case TIOCSPGRP: 953 case FIOSETOWN: 954 #endif 955 case TIOCSTAT: 956 case TIOCSTI: 957 case TIOCSWINSZ: 958 case TIOCSQSIZE: 959 case TIOCLBIC: 960 case TIOCLBIS: 961 case TIOCLSET: 962 case TIOCSETC: 963 case OTIOCSETD: 964 case TIOCSETN: 965 case TIOCSETP: 966 case TIOCSLTC: 967 mutex_spin_enter(&tty_lock); 968 while (isbackground(curproc, tp) && 969 p->p_pgrp->pg_jobc && (p->p_lflag & PL_PPWAIT) == 0 && 970 !sigismasked(l, SIGTTOU)) { 971 mutex_spin_exit(&tty_lock); 972 973 mutex_enter(proc_lock); 974 pgsignal(p->p_pgrp, SIGTTOU, 1); 975 mutex_exit(proc_lock); 976 977 mutex_spin_enter(&tty_lock); 978 error = ttypause(tp, hz); 979 if (error) { 980 mutex_spin_exit(&tty_lock); 981 return (error); 982 } 983 } 984 mutex_spin_exit(&tty_lock); 985 break; 986 } 987 988 switch (cmd) { /* Process the ioctl. */ 989 case FIOASYNC: /* set/clear async i/o */ 990 mutex_spin_enter(&tty_lock); 991 if (*(int *)data) 992 SET(tp->t_state, TS_ASYNC); 993 else 994 CLR(tp->t_state, TS_ASYNC); 995 mutex_spin_exit(&tty_lock); 996 break; 997 case FIONBIO: /* set/clear non-blocking i/o */ 998 break; /* XXX: delete. */ 999 case FIONREAD: /* get # bytes to read */ 1000 mutex_spin_enter(&tty_lock); 1001 *(int *)data = ttnread(tp); 1002 mutex_spin_exit(&tty_lock); 1003 break; 1004 case FIONWRITE: /* get # bytes to written & unsent */ 1005 mutex_spin_enter(&tty_lock); 1006 *(int *)data = tp->t_outq.c_cc; 1007 mutex_spin_exit(&tty_lock); 1008 break; 1009 case FIONSPACE: /* get # bytes to written & unsent */ 1010 mutex_spin_enter(&tty_lock); 1011 *(int *)data = tp->t_outq.c_cn - tp->t_outq.c_cc; 1012 mutex_spin_exit(&tty_lock); 1013 break; 1014 case TIOCEXCL: /* set exclusive use of tty */ 1015 mutex_spin_enter(&tty_lock); 1016 SET(tp->t_state, TS_XCLUDE); 1017 mutex_spin_exit(&tty_lock); 1018 break; 1019 case TIOCFLUSH: { /* flush buffers */ 1020 int flags = *(int *)data; 1021 1022 if (flags == 0) 1023 flags = FREAD | FWRITE; 1024 else 1025 flags &= FREAD | FWRITE; 1026 mutex_spin_enter(&tty_lock); 1027 ttyflush(tp, flags); 1028 mutex_spin_exit(&tty_lock); 1029 break; 1030 } 1031 case TIOCCONS: /* become virtual console */ 1032 if (*(int *)data) { 1033 if (constty && constty != tp && 1034 ISSET(constty->t_state, TS_CARR_ON | TS_ISOPEN) == 1035 (TS_CARR_ON | TS_ISOPEN)) 1036 return EBUSY; 1037 1038 pb = pathbuf_create("/dev/console"); 1039 if (pb == NULL) { 1040 return ENOMEM; 1041 } 1042 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, pb); 1043 if ((error = namei(&nd)) != 0) { 1044 pathbuf_destroy(pb); 1045 return error; 1046 } 1047 error = VOP_ACCESS(nd.ni_vp, VREAD, l->l_cred); 1048 vput(nd.ni_vp); 1049 pathbuf_destroy(pb); 1050 if (error) 1051 return error; 1052 1053 constty = tp; 1054 } else if (tp == constty) 1055 constty = NULL; 1056 break; 1057 case TIOCDRAIN: /* wait till output drained */ 1058 if ((error = ttywait(tp)) != 0) 1059 return (error); 1060 break; 1061 case TIOCGETA: { /* get termios struct */ 1062 struct termios *t = (struct termios *)data; 1063 1064 memcpy(t, &tp->t_termios, sizeof(struct termios)); 1065 break; 1066 } 1067 case TIOCGETD: /* get line discipline (old) */ 1068 *(int *)data = tp->t_linesw->l_no; 1069 break; 1070 case TIOCGLINED: /* get line discipline (new) */ 1071 (void)strncpy((char *)data, tp->t_linesw->l_name, 1072 TTLINEDNAMELEN - 1); 1073 break; 1074 case TIOCGWINSZ: /* get window size */ 1075 *(struct winsize *)data = tp->t_winsize; 1076 break; 1077 case TIOCGQSIZE: 1078 *(int *)data = tp->t_qsize; 1079 break; 1080 case FIOGETOWN: 1081 mutex_enter(proc_lock); 1082 if (tp->t_session != NULL && !isctty(p, tp)) { 1083 mutex_exit(proc_lock); 1084 return (ENOTTY); 1085 } 1086 *(int *)data = tp->t_pgrp ? -tp->t_pgrp->pg_id : 0; 1087 mutex_exit(proc_lock); 1088 break; 1089 case TIOCGPGRP: /* get pgrp of tty */ 1090 mutex_enter(proc_lock); 1091 if (!isctty(p, tp)) { 1092 mutex_exit(proc_lock); 1093 return (ENOTTY); 1094 } 1095 *(int *)data = tp->t_pgrp ? tp->t_pgrp->pg_id : NO_PGID; 1096 mutex_exit(proc_lock); 1097 break; 1098 case TIOCGSID: /* get sid of tty */ 1099 mutex_enter(proc_lock); 1100 if (!isctty(p, tp)) { 1101 mutex_exit(proc_lock); 1102 return (ENOTTY); 1103 } 1104 *(int *)data = tp->t_session->s_sid; 1105 mutex_exit(proc_lock); 1106 break; 1107 #ifdef TIOCHPCL 1108 case TIOCHPCL: /* hang up on last close */ 1109 mutex_spin_enter(&tty_lock); 1110 SET(tp->t_cflag, HUPCL); 1111 mutex_spin_exit(&tty_lock); 1112 break; 1113 #endif 1114 case TIOCNXCL: /* reset exclusive use of tty */ 1115 mutex_spin_enter(&tty_lock); 1116 CLR(tp->t_state, TS_XCLUDE); 1117 mutex_spin_exit(&tty_lock); 1118 break; 1119 case TIOCOUTQ: /* output queue size */ 1120 *(int *)data = tp->t_outq.c_cc; 1121 break; 1122 case TIOCSETA: /* set termios struct */ 1123 case TIOCSETAW: /* drain output, set */ 1124 case TIOCSETAF: { /* drn out, fls in, set */ 1125 struct termios *t = (struct termios *)data; 1126 1127 if (cmd == TIOCSETAW || cmd == TIOCSETAF) { 1128 if ((error = ttywait(tp)) != 0) 1129 return (error); 1130 1131 if (cmd == TIOCSETAF) { 1132 mutex_spin_enter(&tty_lock); 1133 ttyflush(tp, FREAD); 1134 mutex_spin_exit(&tty_lock); 1135 } 1136 } 1137 1138 s = spltty(); 1139 /* 1140 * XXXSMP - some drivers call back on us from t_param(), so 1141 * don't take the tty spin lock here. 1142 * require t_param() to unlock upon callback? 1143 */ 1144 /* wanted here: mutex_spin_enter(&tty_lock); */ 1145 if (!ISSET(t->c_cflag, CIGNORE)) { 1146 /* 1147 * Set device hardware. 1148 */ 1149 if (tp->t_param && (error = (*tp->t_param)(tp, t))) { 1150 /* wanted here: mutex_spin_exit(&tty_lock); */ 1151 splx(s); 1152 return (error); 1153 } else { 1154 tp->t_cflag = t->c_cflag; 1155 tp->t_ispeed = t->c_ispeed; 1156 tp->t_ospeed = t->c_ospeed; 1157 if (t->c_ospeed == 0) 1158 ttysig(tp, TTYSIG_LEADER, SIGHUP); 1159 } 1160 ttsetwater(tp); 1161 } 1162 1163 /* delayed lock acquiring */ 1164 mutex_spin_enter(&tty_lock); 1165 if (cmd != TIOCSETAF) { 1166 if (ISSET(t->c_lflag, ICANON) != 1167 ISSET(tp->t_lflag, ICANON)) { 1168 if (ISSET(t->c_lflag, ICANON)) { 1169 SET(tp->t_lflag, PENDIN); 1170 ttwakeup(tp); 1171 } else { 1172 struct clist tq; 1173 1174 catq(&tp->t_rawq, &tp->t_canq); 1175 tq = tp->t_rawq; 1176 tp->t_rawq = tp->t_canq; 1177 tp->t_canq = tq; 1178 CLR(tp->t_lflag, PENDIN); 1179 } 1180 } 1181 } 1182 tp->t_iflag = t->c_iflag; 1183 tp->t_oflag = t->c_oflag; 1184 /* 1185 * Make the EXTPROC bit read only. 1186 */ 1187 if (ISSET(tp->t_lflag, EXTPROC)) 1188 SET(t->c_lflag, EXTPROC); 1189 else 1190 CLR(t->c_lflag, EXTPROC); 1191 tp->t_lflag = t->c_lflag | ISSET(tp->t_lflag, PENDIN); 1192 memcpy(tp->t_cc, t->c_cc, sizeof(t->c_cc)); 1193 mutex_spin_exit(&tty_lock); 1194 splx(s); 1195 break; 1196 } 1197 case TIOCSETD: /* set line discipline (old) */ 1198 lp = ttyldisc_lookup_bynum(*(int *)data); 1199 goto setldisc; 1200 1201 case TIOCSLINED: { /* set line discipline (new) */ 1202 char *name = (char *)data; 1203 dev_t device; 1204 1205 /* Null terminate to prevent buffer overflow */ 1206 name[TTLINEDNAMELEN - 1] = '\0'; 1207 lp = ttyldisc_lookup(name); 1208 setldisc: 1209 if (lp == NULL) 1210 return (ENXIO); 1211 1212 if (lp != tp->t_linesw) { 1213 device = tp->t_dev; 1214 s = spltty(); 1215 (*tp->t_linesw->l_close)(tp, flag); 1216 error = (*lp->l_open)(device, tp); 1217 if (error) { 1218 (void)(*tp->t_linesw->l_open)(device, tp); 1219 splx(s); 1220 ttyldisc_release(lp); 1221 return (error); 1222 } 1223 ttyldisc_release(tp->t_linesw); 1224 tp->t_linesw = lp; 1225 splx(s); 1226 } else { 1227 /* Drop extra reference. */ 1228 ttyldisc_release(lp); 1229 } 1230 break; 1231 } 1232 case TIOCSTART: /* start output, like ^Q */ 1233 mutex_spin_enter(&tty_lock); 1234 if (ISSET(tp->t_state, TS_TTSTOP) || 1235 ISSET(tp->t_lflag, FLUSHO)) { 1236 CLR(tp->t_lflag, FLUSHO); 1237 CLR(tp->t_state, TS_TTSTOP); 1238 ttstart(tp); 1239 } 1240 mutex_spin_exit(&tty_lock); 1241 break; 1242 case TIOCSTI: /* simulate terminal input */ 1243 if ((error = kauth_authorize_device_tty(l->l_cred, 1244 KAUTH_DEVICE_TTY_STI, tp)) != 0) { 1245 if (!ISSET(flag, FREAD)) 1246 return EPERM; 1247 if (!isctty(p, tp)) 1248 return EACCES; 1249 if (tp->t_session->s_leader->p_cred != p->p_cred) 1250 return error; 1251 } 1252 (*tp->t_linesw->l_rint)(*(u_char *)data, tp); 1253 break; 1254 case TIOCSTOP: /* stop output, like ^S */ 1255 { 1256 mutex_spin_enter(&tty_lock); 1257 if (!ISSET(tp->t_state, TS_TTSTOP)) { 1258 SET(tp->t_state, TS_TTSTOP); 1259 cdev_stop(tp, 0); 1260 } 1261 mutex_spin_exit(&tty_lock); 1262 break; 1263 } 1264 case TIOCSCTTY: /* become controlling tty */ 1265 mutex_enter(proc_lock); 1266 mutex_spin_enter(&tty_lock); 1267 1268 /* Session ctty vnode pointer set in vnode layer. */ 1269 if (!SESS_LEADER(p) || 1270 ((p->p_session->s_ttyvp || tp->t_session) && 1271 (tp->t_session != p->p_session))) { 1272 mutex_spin_exit(&tty_lock); 1273 mutex_exit(proc_lock); 1274 return (EPERM); 1275 } 1276 1277 /* 1278 * `p_session' acquires a reference. 1279 * But note that if `t_session' is set at this point, 1280 * it must equal `p_session', in which case the session 1281 * already has the correct reference count. 1282 */ 1283 if (tp->t_session == NULL) { 1284 proc_sesshold(p->p_session); 1285 } 1286 tp->t_session = p->p_session; 1287 tp->t_pgrp = p->p_pgrp; 1288 p->p_session->s_ttyp = tp; 1289 p->p_lflag |= PL_CONTROLT; 1290 mutex_spin_exit(&tty_lock); 1291 mutex_exit(proc_lock); 1292 break; 1293 case FIOSETOWN: { /* set pgrp of tty */ 1294 pid_t pgid = *(pid_t *)data; 1295 struct pgrp *pgrp; 1296 1297 mutex_enter(proc_lock); 1298 if (tp->t_session != NULL && !isctty(p, tp)) { 1299 mutex_exit(proc_lock); 1300 return (ENOTTY); 1301 } 1302 1303 if (pgid < 0) { 1304 pgrp = pgrp_find(-pgid); 1305 if (pgrp == NULL) { 1306 mutex_exit(proc_lock); 1307 return (EINVAL); 1308 } 1309 } else { 1310 struct proc *p1; 1311 p1 = proc_find(pgid); 1312 if (!p1) { 1313 mutex_exit(proc_lock); 1314 return (ESRCH); 1315 } 1316 pgrp = p1->p_pgrp; 1317 } 1318 1319 if (pgrp->pg_session != p->p_session) { 1320 mutex_exit(proc_lock); 1321 return (EPERM); 1322 } 1323 mutex_spin_enter(&tty_lock); 1324 tp->t_pgrp = pgrp; 1325 mutex_spin_exit(&tty_lock); 1326 mutex_exit(proc_lock); 1327 break; 1328 } 1329 case TIOCSPGRP: { /* set pgrp of tty */ 1330 struct pgrp *pgrp; 1331 pid_t pgid = *(pid_t *)data; 1332 1333 if (pgid == NO_PGID) 1334 return EINVAL; 1335 1336 mutex_enter(proc_lock); 1337 if (!isctty(p, tp)) { 1338 mutex_exit(proc_lock); 1339 return (ENOTTY); 1340 } 1341 pgrp = pgrp_find(pgid); 1342 if (pgrp == NULL || pgrp->pg_session != p->p_session) { 1343 mutex_exit(proc_lock); 1344 return (EPERM); 1345 } 1346 mutex_spin_enter(&tty_lock); 1347 tp->t_pgrp = pgrp; 1348 mutex_spin_exit(&tty_lock); 1349 mutex_exit(proc_lock); 1350 break; 1351 } 1352 case TIOCSTAT: /* get load avg stats */ 1353 mutex_enter(proc_lock); 1354 ttygetinfo(tp, 0, infobuf, sizeof(infobuf)); 1355 mutex_exit(proc_lock); 1356 1357 mutex_spin_enter(&tty_lock); 1358 ttyputinfo(tp, infobuf); 1359 mutex_spin_exit(&tty_lock); 1360 break; 1361 case TIOCSWINSZ: /* set window size */ 1362 mutex_spin_enter(&tty_lock); 1363 if (memcmp((void *)&tp->t_winsize, data, 1364 sizeof(struct winsize))) { 1365 tp->t_winsize = *(struct winsize *)data; 1366 ttysig(tp, TTYSIG_PG1, SIGWINCH); 1367 } 1368 mutex_spin_exit(&tty_lock); 1369 break; 1370 case TIOCSQSIZE: 1371 if ((error = tty_get_qsize(&s, *(int *)data)) == 0 && 1372 s != tp->t_qsize) 1373 error = tty_set_qsize(tp, s); 1374 return error; 1375 1376 case TIOCSBRK: 1377 case TIOCCBRK: 1378 case TIOCSDTR: 1379 case TIOCCDTR: 1380 case TIOCSFLAGS: 1381 case TIOCGFLAGS: 1382 case TIOCMSET: 1383 case TIOCMGET: 1384 case TIOCMBIS: 1385 case TIOCMBIC: 1386 /* Handled by the driver layer */ 1387 return EPASSTHROUGH; 1388 1389 case TIOCEXT: 1390 case TIOCPTSNAME: 1391 case TIOCGRANTPT: 1392 case TIOCPKT: 1393 case TIOCUCNTL: 1394 case TIOCREMOTE: 1395 case TIOCSIG: 1396 /* for ptys */ 1397 return EPASSTHROUGH; 1398 1399 default: 1400 /* Pass through various console ioctls */ 1401 switch (IOCGROUP(cmd)) { 1402 case 'c': /* syscons console */ 1403 case 'v': /* usl console, video - where one letter */ 1404 case 'K': /* usl console, keyboard - aint enough */ 1405 case 'V': /* pcvt compat */ 1406 case 'W': /* wscons console */ 1407 return EPASSTHROUGH; 1408 default: 1409 break; 1410 } 1411 #ifdef COMPAT_60 1412 error = compat_60_ttioctl(tp, cmd, data, flag, l); 1413 if (error != EPASSTHROUGH) 1414 return error; 1415 #endif /* COMPAT_60 */ 1416 /* We may have to load the compat module for this. */ 1417 for (;;) { 1418 rw_enter(&ttcompat_lock, RW_READER); 1419 if (ttcompatvec != NULL) { 1420 break; 1421 } 1422 rw_exit(&ttcompat_lock); 1423 (void)module_autoload("compat", MODULE_CLASS_ANY); 1424 if (ttcompatvec == NULL) { 1425 return EPASSTHROUGH; 1426 } 1427 } 1428 error = (*ttcompatvec)(tp, cmd, data, flag, l); 1429 rw_exit(&ttcompat_lock); 1430 return error; 1431 } 1432 return (0); 1433 } 1434 1435 int 1436 ttpoll(struct tty *tp, int events, struct lwp *l) 1437 { 1438 int revents; 1439 1440 revents = 0; 1441 mutex_spin_enter(&tty_lock); 1442 if (events & (POLLIN | POLLRDNORM)) 1443 if (ttnread(tp) > 0) 1444 revents |= events & (POLLIN | POLLRDNORM); 1445 1446 if (events & (POLLOUT | POLLWRNORM)) 1447 if (tp->t_outq.c_cc <= tp->t_lowat) 1448 revents |= events & (POLLOUT | POLLWRNORM); 1449 1450 if (events & POLLHUP) 1451 if (!CONNECTED(tp)) 1452 revents |= POLLHUP; 1453 1454 if (revents == 0) { 1455 if (events & (POLLIN | POLLHUP | POLLRDNORM)) 1456 selrecord(l, &tp->t_rsel); 1457 1458 if (events & (POLLOUT | POLLWRNORM)) 1459 selrecord(l, &tp->t_wsel); 1460 } 1461 1462 mutex_spin_exit(&tty_lock); 1463 1464 return (revents); 1465 } 1466 1467 static void 1468 filt_ttyrdetach(struct knote *kn) 1469 { 1470 struct tty *tp; 1471 1472 tp = kn->kn_hook; 1473 mutex_spin_enter(&tty_lock); 1474 SLIST_REMOVE(&tp->t_rsel.sel_klist, kn, knote, kn_selnext); 1475 mutex_spin_exit(&tty_lock); 1476 } 1477 1478 static int 1479 filt_ttyread(struct knote *kn, long hint) 1480 { 1481 struct tty *tp; 1482 1483 tp = kn->kn_hook; 1484 if ((hint & NOTE_SUBMIT) == 0) 1485 mutex_spin_enter(&tty_lock); 1486 kn->kn_data = ttnread(tp); 1487 if ((hint & NOTE_SUBMIT) == 0) 1488 mutex_spin_exit(&tty_lock); 1489 return (kn->kn_data > 0); 1490 } 1491 1492 static void 1493 filt_ttywdetach(struct knote *kn) 1494 { 1495 struct tty *tp; 1496 1497 tp = kn->kn_hook; 1498 mutex_spin_enter(&tty_lock); 1499 SLIST_REMOVE(&tp->t_wsel.sel_klist, kn, knote, kn_selnext); 1500 mutex_spin_exit(&tty_lock); 1501 } 1502 1503 static int 1504 filt_ttywrite(struct knote *kn, long hint) 1505 { 1506 struct tty *tp; 1507 int canwrite; 1508 1509 tp = kn->kn_hook; 1510 if ((hint & NOTE_SUBMIT) == 0) 1511 mutex_spin_enter(&tty_lock); 1512 kn->kn_data = tp->t_outq.c_cn - tp->t_outq.c_cc; 1513 canwrite = (tp->t_outq.c_cc <= tp->t_lowat) && CONNECTED(tp); 1514 if ((hint & NOTE_SUBMIT) == 0) 1515 mutex_spin_exit(&tty_lock); 1516 return (canwrite); 1517 } 1518 1519 static const struct filterops ttyread_filtops = 1520 { 1, NULL, filt_ttyrdetach, filt_ttyread }; 1521 static const struct filterops ttywrite_filtops = 1522 { 1, NULL, filt_ttywdetach, filt_ttywrite }; 1523 1524 int 1525 ttykqfilter(dev_t dev, struct knote *kn) 1526 { 1527 struct tty *tp; 1528 struct klist *klist; 1529 1530 if ((tp = cdev_tty(dev)) == NULL) 1531 return (ENXIO); 1532 1533 switch (kn->kn_filter) { 1534 case EVFILT_READ: 1535 klist = &tp->t_rsel.sel_klist; 1536 kn->kn_fop = &ttyread_filtops; 1537 break; 1538 case EVFILT_WRITE: 1539 klist = &tp->t_wsel.sel_klist; 1540 kn->kn_fop = &ttywrite_filtops; 1541 break; 1542 default: 1543 return EINVAL; 1544 } 1545 1546 kn->kn_hook = tp; 1547 1548 mutex_spin_enter(&tty_lock); 1549 SLIST_INSERT_HEAD(klist, kn, kn_selnext); 1550 mutex_spin_exit(&tty_lock); 1551 1552 return (0); 1553 } 1554 1555 /* 1556 * Find the number of chars ready to be read from this tty. 1557 * Call with the tty lock held. 1558 */ 1559 static int 1560 ttnread(struct tty *tp) 1561 { 1562 int nread; 1563 1564 KASSERT(mutex_owned(&tty_lock)); 1565 1566 if (ISSET(tp->t_lflag, PENDIN)) 1567 ttypend(tp); 1568 nread = tp->t_canq.c_cc; 1569 if (!ISSET(tp->t_lflag, ICANON)) { 1570 nread += tp->t_rawq.c_cc; 1571 if (nread < tp->t_cc[VMIN] && !tp->t_cc[VTIME]) 1572 nread = 0; 1573 } 1574 return (nread); 1575 } 1576 1577 /* 1578 * Wait for output to drain, or if this times out, flush it. 1579 */ 1580 static int 1581 ttywait_timo(struct tty *tp, int timo) 1582 { 1583 int error; 1584 1585 error = 0; 1586 1587 mutex_spin_enter(&tty_lock); 1588 while ((tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY)) && 1589 CONNECTED(tp) && tp->t_oproc) { 1590 (*tp->t_oproc)(tp); 1591 error = ttysleep(tp, &tp->t_outcv, true, timo); 1592 if (error == EWOULDBLOCK) 1593 ttyflush(tp, FWRITE); 1594 if (error) 1595 break; 1596 } 1597 mutex_spin_exit(&tty_lock); 1598 1599 return (error); 1600 } 1601 1602 /* 1603 * Wait for output to drain. 1604 */ 1605 int 1606 ttywait(struct tty *tp) 1607 { 1608 return ttywait_timo(tp, 0); 1609 } 1610 1611 /* 1612 * Flush if successfully wait. 1613 */ 1614 int 1615 ttywflush(struct tty *tp) 1616 { 1617 int error; 1618 1619 error = ttywait_timo(tp, 5 * hz); 1620 if (error == 0 || error == EWOULDBLOCK) { 1621 mutex_spin_enter(&tty_lock); 1622 ttyflush(tp, FREAD); 1623 mutex_spin_exit(&tty_lock); 1624 } 1625 return (error); 1626 } 1627 1628 /* 1629 * Flush tty read and/or write queues, notifying anyone waiting. 1630 * Call with the tty lock held. 1631 */ 1632 void 1633 ttyflush(struct tty *tp, int rw) 1634 { 1635 1636 KASSERT(mutex_owned(&tty_lock)); 1637 1638 if (rw & FREAD) { 1639 FLUSHQ(&tp->t_canq); 1640 FLUSHQ(&tp->t_rawq); 1641 tp->t_rocount = 0; 1642 tp->t_rocol = 0; 1643 CLR(tp->t_state, TS_LOCAL); 1644 ttwakeup(tp); 1645 } 1646 if (rw & FWRITE) { 1647 CLR(tp->t_state, TS_TTSTOP); 1648 cdev_stop(tp, rw); 1649 FLUSHQ(&tp->t_outq); 1650 cv_broadcast(&tp->t_outcv); 1651 selnotify(&tp->t_wsel, 0, NOTE_SUBMIT); 1652 } 1653 } 1654 1655 /* 1656 * Copy in the default termios characters. 1657 */ 1658 void 1659 ttychars(struct tty *tp) 1660 { 1661 1662 memcpy(tp->t_cc, ttydefchars, sizeof(ttydefchars)); 1663 } 1664 1665 /* 1666 * Send stop character on input overflow. 1667 * Call with the tty lock held. 1668 */ 1669 static void 1670 ttyblock(struct tty *tp) 1671 { 1672 int total; 1673 1674 KASSERT(mutex_owned(&tty_lock)); 1675 1676 total = tp->t_rawq.c_cc + tp->t_canq.c_cc; 1677 if (tp->t_rawq.c_cc > TTYHOG) { 1678 ttyflush(tp, FREAD | FWRITE); 1679 CLR(tp->t_state, TS_TBLOCK); 1680 } 1681 /* 1682 * Block further input iff: current input > threshold 1683 * AND input is available to user program. 1684 */ 1685 if (total >= TTYHOG / 2 && 1686 !ISSET(tp->t_state, TS_TBLOCK) && 1687 (!ISSET(tp->t_lflag, ICANON) || tp->t_canq.c_cc > 0)) { 1688 if (ISSET(tp->t_iflag, IXOFF) && 1689 tp->t_cc[VSTOP] != _POSIX_VDISABLE && 1690 putc(tp->t_cc[VSTOP], &tp->t_outq) == 0) { 1691 SET(tp->t_state, TS_TBLOCK); 1692 ttstart(tp); 1693 } 1694 /* Try to block remote output via hardware flow control. */ 1695 if (ISSET(tp->t_cflag, CHWFLOW) && tp->t_hwiflow && 1696 (*tp->t_hwiflow)(tp, 1) != 0) 1697 SET(tp->t_state, TS_TBLOCK); 1698 } 1699 } 1700 1701 /* 1702 * Delayed line discipline output 1703 */ 1704 void 1705 ttrstrt(void *tp_arg) 1706 { 1707 struct tty *tp; 1708 1709 #ifdef DIAGNOSTIC 1710 if (tp_arg == NULL) 1711 panic("ttrstrt"); 1712 #endif 1713 tp = tp_arg; 1714 mutex_spin_enter(&tty_lock); 1715 1716 CLR(tp->t_state, TS_TIMEOUT); 1717 ttstart(tp); /* XXX - Shouldn't this be tp->l_start(tp)? */ 1718 1719 mutex_spin_exit(&tty_lock); 1720 } 1721 1722 /* 1723 * start a line discipline 1724 * Always call with tty lock held? 1725 */ 1726 int 1727 ttstart(struct tty *tp) 1728 { 1729 1730 if (tp->t_oproc != NULL) /* XXX: Kludge for pty. */ 1731 (*tp->t_oproc)(tp); 1732 return (0); 1733 } 1734 1735 /* 1736 * "close" a line discipline 1737 */ 1738 int 1739 ttylclose(struct tty *tp, int flag) 1740 { 1741 1742 if (flag & FNONBLOCK) { 1743 mutex_spin_enter(&tty_lock); 1744 ttyflush(tp, FREAD | FWRITE); 1745 mutex_spin_exit(&tty_lock); 1746 } else 1747 ttywflush(tp); 1748 return (0); 1749 } 1750 1751 /* 1752 * Handle modem control transition on a tty. 1753 * Flag indicates new state of carrier. 1754 * Returns 0 if the line should be turned off, otherwise 1. 1755 */ 1756 int 1757 ttymodem(struct tty *tp, int flag) 1758 { 1759 1760 mutex_spin_enter(&tty_lock); 1761 if (flag == 0) { 1762 if (ISSET(tp->t_state, TS_CARR_ON)) { 1763 /* 1764 * Lost carrier. 1765 */ 1766 CLR(tp->t_state, TS_CARR_ON); 1767 if (ISSET(tp->t_state, TS_ISOPEN) && !CONNECTED(tp)) { 1768 ttysig(tp, TTYSIG_LEADER, SIGHUP); 1769 ttyflush(tp, FREAD | FWRITE); 1770 mutex_spin_exit(&tty_lock); 1771 return (0); 1772 } 1773 } 1774 } else { 1775 if (!ISSET(tp->t_state, TS_CARR_ON)) { 1776 /* 1777 * Carrier now on. 1778 */ 1779 SET(tp->t_state, TS_CARR_ON); 1780 ttwakeup(tp); 1781 } 1782 } 1783 mutex_spin_exit(&tty_lock); 1784 1785 return (1); 1786 } 1787 1788 /* 1789 * Default modem control routine (for other line disciplines). 1790 * Return argument flag, to turn off device on carrier drop. 1791 */ 1792 int 1793 nullmodem(struct tty *tp, int flag) 1794 { 1795 1796 mutex_spin_enter(&tty_lock); 1797 if (flag) 1798 SET(tp->t_state, TS_CARR_ON); 1799 else { 1800 CLR(tp->t_state, TS_CARR_ON); 1801 if (!CONNECTED(tp)) { 1802 ttysig(tp, TTYSIG_LEADER, SIGHUP); 1803 mutex_spin_exit(&tty_lock); 1804 return (0); 1805 } 1806 } 1807 mutex_spin_exit(&tty_lock); 1808 1809 return (1); 1810 } 1811 1812 /* 1813 * Reinput pending characters after state switch. 1814 */ 1815 void 1816 ttypend(struct tty *tp) 1817 { 1818 struct clist tq; 1819 int c; 1820 1821 KASSERT(mutex_owned(&tty_lock)); 1822 1823 CLR(tp->t_lflag, PENDIN); 1824 SET(tp->t_state, TS_TYPEN); 1825 tq = tp->t_rawq; 1826 tp->t_rawq.c_cc = 0; 1827 tp->t_rawq.c_cf = tp->t_rawq.c_cl = 0; 1828 while ((c = getc(&tq)) >= 0) 1829 ttyinput_wlock(c, tp); 1830 CLR(tp->t_state, TS_TYPEN); 1831 } 1832 1833 /* 1834 * Process a read call on a tty device. 1835 */ 1836 int 1837 ttread(struct tty *tp, struct uio *uio, int flag) 1838 { 1839 struct clist *qp; 1840 u_char *cc; 1841 struct proc *p; 1842 int c, first, error, has_stime, last_cc; 1843 long lflag, slp; 1844 struct timeval now, stime; 1845 1846 if (uio->uio_resid == 0) 1847 return 0; 1848 1849 stime.tv_usec = 0; /* XXX gcc */ 1850 stime.tv_sec = 0; /* XXX gcc */ 1851 1852 cc = tp->t_cc; 1853 p = curproc; 1854 error = 0; 1855 has_stime = 0; 1856 last_cc = 0; 1857 slp = 0; 1858 1859 loop: 1860 mutex_spin_enter(&tty_lock); 1861 lflag = tp->t_lflag; 1862 /* 1863 * take pending input first 1864 */ 1865 if (ISSET(lflag, PENDIN)) 1866 ttypend(tp); 1867 1868 /* 1869 * Hang process if it's in the background. 1870 */ 1871 if (isbackground(p, tp)) { 1872 if (sigismasked(curlwp, SIGTTIN) || 1873 p->p_lflag & PL_PPWAIT || p->p_pgrp->pg_jobc == 0) { 1874 mutex_spin_exit(&tty_lock); 1875 return (EIO); 1876 } 1877 mutex_spin_exit(&tty_lock); 1878 1879 mutex_enter(proc_lock); 1880 pgsignal(p->p_pgrp, SIGTTIN, 1); 1881 mutex_exit(proc_lock); 1882 1883 mutex_spin_enter(&tty_lock); 1884 error = ttypause(tp, hz); 1885 mutex_spin_exit(&tty_lock); 1886 if (error) 1887 return (error); 1888 goto loop; 1889 } 1890 1891 if (!ISSET(lflag, ICANON)) { 1892 int m = cc[VMIN]; 1893 long t = cc[VTIME]; 1894 1895 qp = &tp->t_rawq; 1896 /* 1897 * Check each of the four combinations. 1898 * (m > 0 && t == 0) is the normal read case. 1899 * It should be fairly efficient, so we check that and its 1900 * companion case (m == 0 && t == 0) first. 1901 * For the other two cases, we compute the target sleep time 1902 * into slp. 1903 */ 1904 if (t == 0) { 1905 if (qp->c_cc < m) 1906 goto sleep; 1907 goto read; 1908 } 1909 t *= hz; /* time in deca-ticks */ 1910 /* 1911 * Time difference in deca-ticks, split division to avoid numeric overflow. 1912 * Ok for hz < ~200kHz 1913 */ 1914 #define diff(t1, t2) (((t1).tv_sec - (t2).tv_sec) * 10 * hz + \ 1915 ((t1).tv_usec - (t2).tv_usec) / 100 * hz / 1000) 1916 if (m > 0) { 1917 if (qp->c_cc <= 0) 1918 goto sleep; 1919 if (qp->c_cc >= m) 1920 goto read; 1921 if (!has_stime) { 1922 /* first character, start timer */ 1923 has_stime = 1; 1924 getmicrotime(&stime); 1925 slp = t; 1926 } else if (qp->c_cc > last_cc) { 1927 /* got a character, restart timer */ 1928 getmicrotime(&stime); 1929 slp = t; 1930 } else { 1931 /* nothing, check expiration */ 1932 getmicrotime(&now); 1933 slp = t - diff(now, stime); 1934 } 1935 } else { /* m == 0 */ 1936 if (qp->c_cc > 0) 1937 goto read; 1938 if (!has_stime) { 1939 has_stime = 1; 1940 getmicrotime(&stime); 1941 slp = t; 1942 } else { 1943 getmicrotime(&now); 1944 slp = t - diff(now, stime); 1945 } 1946 } 1947 last_cc = qp->c_cc; 1948 #undef diff 1949 if (slp > 0) { 1950 /* 1951 * Convert deca-ticks back to ticks. 1952 * Rounding down may make us wake up just short 1953 * of the target, so we round up. 1954 * Maybe we should do 'slp/10 + 1' because the 1955 * first tick maybe almost immediate. 1956 * However it is more useful for a program that sets 1957 * VTIME=10 to wakeup every second not every 1.01 1958 * seconds (if hz=100). 1959 */ 1960 slp = (slp + 9)/ 10; 1961 goto sleep; 1962 } 1963 } else if ((qp = &tp->t_canq)->c_cc <= 0) { 1964 int carrier; 1965 1966 sleep: 1967 /* 1968 * If there is no input, sleep on rawq 1969 * awaiting hardware receipt and notification. 1970 * If we have data, we don't need to check for carrier. 1971 */ 1972 carrier = CONNECTED(tp); 1973 if (!carrier && ISSET(tp->t_state, TS_ISOPEN)) { 1974 mutex_spin_exit(&tty_lock); 1975 return (0); /* EOF */ 1976 } 1977 if (!has_stime || slp <= 0) { 1978 if (flag & IO_NDELAY) { 1979 mutex_spin_exit(&tty_lock); 1980 return (EWOULDBLOCK); 1981 } 1982 } 1983 error = ttysleep(tp, &tp->t_rawcv, true, slp); 1984 mutex_spin_exit(&tty_lock); 1985 /* VMIN == 0: any quantity read satisfies */ 1986 if (cc[VMIN] == 0 && error == EWOULDBLOCK) 1987 return (0); 1988 if (error && error != EWOULDBLOCK) 1989 return (error); 1990 goto loop; 1991 } 1992 read: 1993 1994 /* 1995 * Input present, check for input mapping and processing. 1996 */ 1997 first = 1; 1998 while ((c = getc(qp)) >= 0) { 1999 /* 2000 * delayed suspend (^Y) 2001 */ 2002 if (CCEQ(cc[VDSUSP], c) && 2003 ISSET(lflag, IEXTEN|ISIG) == (IEXTEN|ISIG)) { 2004 ttysig(tp, TTYSIG_PG1, SIGTSTP); 2005 if (first) { 2006 error = ttypause(tp, hz); 2007 if (error) 2008 break; 2009 mutex_spin_exit(&tty_lock); 2010 goto loop; 2011 } 2012 break; 2013 } 2014 /* 2015 * Interpret EOF only in canonical mode. 2016 */ 2017 if (CCEQ(cc[VEOF], c) && ISSET(lflag, ICANON)) 2018 break; 2019 /* 2020 * Give user character. 2021 */ 2022 mutex_spin_exit(&tty_lock); 2023 error = ureadc(c, uio); 2024 mutex_spin_enter(&tty_lock); 2025 if (error) 2026 break; 2027 if (uio->uio_resid == 0) 2028 break; 2029 /* 2030 * In canonical mode check for a "break character" 2031 * marking the end of a "line of input". 2032 */ 2033 if (ISSET(lflag, ICANON) && TTBREAKC(c, lflag)) 2034 break; 2035 first = 0; 2036 } 2037 2038 /* 2039 * Look to unblock output now that (presumably) 2040 * the input queue has gone down. 2041 */ 2042 if (ISSET(tp->t_state, TS_TBLOCK) && tp->t_rawq.c_cc < TTYHOG / 5) { 2043 if (ISSET(tp->t_iflag, IXOFF) && 2044 cc[VSTART] != _POSIX_VDISABLE && 2045 putc(cc[VSTART], &tp->t_outq) == 0) { 2046 CLR(tp->t_state, TS_TBLOCK); 2047 ttstart(tp); 2048 } 2049 /* Try to unblock remote output via hardware flow control. */ 2050 if (ISSET(tp->t_cflag, CHWFLOW) && tp->t_hwiflow && 2051 (*tp->t_hwiflow)(tp, 0) != 0) 2052 CLR(tp->t_state, TS_TBLOCK); 2053 } 2054 mutex_spin_exit(&tty_lock); 2055 2056 return (error); 2057 } 2058 2059 /* 2060 * Check the output queue on tp for space for a kernel message (from uprintf 2061 * or tprintf). Allow some space over the normal hiwater mark so we don't 2062 * lose messages due to normal flow control, but don't let the tty run amok. 2063 * Sleeps here are not interruptible, but we return prematurely if new signals 2064 * arrive. 2065 * Call with tty lock held. 2066 */ 2067 static int 2068 ttycheckoutq_wlock(struct tty *tp, int wait) 2069 { 2070 int hiwat, error; 2071 2072 KASSERT(mutex_owned(&tty_lock)); 2073 2074 hiwat = tp->t_hiwat; 2075 if (tp->t_outq.c_cc > hiwat + 200) 2076 while (tp->t_outq.c_cc > hiwat) { 2077 ttstart(tp); 2078 if (wait == 0) 2079 return (0); 2080 error = ttysleep(tp, &tp->t_outcv, true, hz); 2081 if (error == EINTR) 2082 wait = 0; 2083 } 2084 2085 return (1); 2086 } 2087 2088 int 2089 ttycheckoutq(struct tty *tp, int wait) 2090 { 2091 int r; 2092 2093 mutex_spin_enter(&tty_lock); 2094 r = ttycheckoutq_wlock(tp, wait); 2095 mutex_spin_exit(&tty_lock); 2096 2097 return (r); 2098 } 2099 2100 /* 2101 * Process a write call on a tty device. 2102 */ 2103 int 2104 ttwrite(struct tty *tp, struct uio *uio, int flag) 2105 { 2106 u_char *cp; 2107 struct proc *p; 2108 int cc, ce, i, hiwat, error; 2109 u_char obuf[OBUFSIZ]; 2110 2111 cp = NULL; 2112 hiwat = tp->t_hiwat; 2113 error = 0; 2114 cc = 0; 2115 loop: 2116 mutex_spin_enter(&tty_lock); 2117 if (!CONNECTED(tp)) { 2118 if (ISSET(tp->t_state, TS_ISOPEN)) { 2119 mutex_spin_exit(&tty_lock); 2120 return (EIO); 2121 } else if (flag & IO_NDELAY) { 2122 mutex_spin_exit(&tty_lock); 2123 error = EWOULDBLOCK; 2124 goto out; 2125 } else { 2126 /* Sleep awaiting carrier. */ 2127 error = ttysleep(tp, &tp->t_rawcv, true, 0); 2128 mutex_spin_exit(&tty_lock); 2129 if (error) 2130 goto out; 2131 goto loop; 2132 } 2133 } 2134 2135 /* 2136 * Hang the process if it's in the background. 2137 */ 2138 p = curproc; 2139 if (isbackground(p, tp) && 2140 ISSET(tp->t_lflag, TOSTOP) && (p->p_lflag & PL_PPWAIT) == 0 && 2141 !sigismasked(curlwp, SIGTTOU)) { 2142 if (p->p_pgrp->pg_jobc == 0) { 2143 error = EIO; 2144 mutex_spin_exit(&tty_lock); 2145 goto out; 2146 } 2147 mutex_spin_exit(&tty_lock); 2148 2149 mutex_enter(proc_lock); 2150 pgsignal(p->p_pgrp, SIGTTOU, 1); 2151 mutex_exit(proc_lock); 2152 2153 mutex_spin_enter(&tty_lock); 2154 error = ttypause(tp, hz); 2155 mutex_spin_exit(&tty_lock); 2156 if (error) 2157 goto out; 2158 goto loop; 2159 } 2160 mutex_spin_exit(&tty_lock); 2161 2162 /* 2163 * Process the user's data in at most OBUFSIZ chunks. Perform any 2164 * output translation. Keep track of high water mark, sleep on 2165 * overflow awaiting device aid in acquiring new space. 2166 */ 2167 while (uio->uio_resid > 0 || cc > 0) { 2168 if (ISSET(tp->t_lflag, FLUSHO)) { 2169 uio->uio_resid = 0; 2170 return (0); 2171 } 2172 if (tp->t_outq.c_cc > hiwat) 2173 goto ovhiwat; 2174 /* 2175 * Grab a hunk of data from the user, unless we have some 2176 * leftover from last time. 2177 */ 2178 if (cc == 0) { 2179 cc = min(uio->uio_resid, OBUFSIZ); 2180 cp = obuf; 2181 error = uiomove(cp, cc, uio); 2182 if (error) { 2183 cc = 0; 2184 goto out; 2185 } 2186 } 2187 /* 2188 * If nothing fancy need be done, grab those characters we 2189 * can handle without any of ttyoutput's processing and 2190 * just transfer them to the output q. For those chars 2191 * which require special processing (as indicated by the 2192 * bits in char_type), call ttyoutput. After processing 2193 * a hunk of data, look for FLUSHO so ^O's will take effect 2194 * immediately. 2195 */ 2196 mutex_spin_enter(&tty_lock); 2197 while (cc > 0) { 2198 if (!ISSET(tp->t_oflag, OPOST)) 2199 ce = cc; 2200 else { 2201 ce = cc - scanc((u_int)cc, cp, char_type, 2202 CCLASSMASK); 2203 /* 2204 * If ce is zero, then we're processing 2205 * a special character through ttyoutput. 2206 */ 2207 if (ce == 0) { 2208 tp->t_rocount = 0; 2209 if (ttyoutput(*cp, tp) >= 0) { 2210 /* out of space */ 2211 mutex_spin_exit(&tty_lock); 2212 goto overfull; 2213 } 2214 cp++; 2215 cc--; 2216 if (ISSET(tp->t_lflag, FLUSHO) || 2217 tp->t_outq.c_cc > hiwat) { 2218 mutex_spin_exit(&tty_lock); 2219 goto ovhiwat; 2220 } 2221 continue; 2222 } 2223 } 2224 /* 2225 * A bunch of normal characters have been found. 2226 * Transfer them en masse to the output queue and 2227 * continue processing at the top of the loop. 2228 * If there are any further characters in this 2229 * <= OBUFSIZ chunk, the first should be a character 2230 * requiring special handling by ttyoutput. 2231 */ 2232 tp->t_rocount = 0; 2233 i = b_to_q(cp, ce, &tp->t_outq); 2234 ce -= i; 2235 tp->t_column += ce; 2236 cp += ce, cc -= ce, tk_nout += ce; 2237 tp->t_outcc += ce; 2238 if (i > 0) { 2239 /* out of space */ 2240 mutex_spin_exit(&tty_lock); 2241 goto overfull; 2242 } 2243 if (ISSET(tp->t_lflag, FLUSHO) || 2244 tp->t_outq.c_cc > hiwat) 2245 break; 2246 } 2247 ttstart(tp); 2248 mutex_spin_exit(&tty_lock); 2249 } 2250 2251 out: 2252 /* 2253 * If cc is nonzero, we leave the uio structure inconsistent, as the 2254 * offset and iov pointers have moved forward, but it doesn't matter 2255 * (the call will either return short or restart with a new uio). 2256 */ 2257 uio->uio_resid += cc; 2258 return (error); 2259 2260 overfull: 2261 /* 2262 * Since we are using ring buffers, if we can't insert any more into 2263 * the output queue, we can assume the ring is full and that someone 2264 * forgot to set the high water mark correctly. We set it and then 2265 * proceed as normal. 2266 */ 2267 hiwat = tp->t_outq.c_cc - 1; 2268 2269 ovhiwat: 2270 mutex_spin_enter(&tty_lock); 2271 ttstart(tp); 2272 /* 2273 * This can only occur if FLUSHO is set in t_lflag, 2274 * or if ttstart/oproc is synchronous (or very fast). 2275 */ 2276 if (tp->t_outq.c_cc <= hiwat) { 2277 mutex_spin_exit(&tty_lock); 2278 goto loop; 2279 } 2280 if (flag & IO_NDELAY) { 2281 mutex_spin_exit(&tty_lock); 2282 error = EWOULDBLOCK; 2283 goto out; 2284 } 2285 error = ttysleep(tp, &tp->t_outcv, true, 0); 2286 mutex_spin_exit(&tty_lock); 2287 if (error) 2288 goto out; 2289 goto loop; 2290 } 2291 2292 /* 2293 * Try to pull more output from the producer. Return non-zero if 2294 * there is output ready to be sent. 2295 */ 2296 bool 2297 ttypull(struct tty *tp) 2298 { 2299 2300 /* XXXSMP not yet KASSERT(mutex_owned(&tty_lock)); */ 2301 2302 if (tp->t_outq.c_cc <= tp->t_lowat) { 2303 cv_broadcast(&tp->t_outcv); 2304 selnotify(&tp->t_wsel, 0, NOTE_SUBMIT); 2305 } 2306 return tp->t_outq.c_cc != 0; 2307 } 2308 2309 /* 2310 * Rubout one character from the rawq of tp 2311 * as cleanly as possible. 2312 * Called with tty lock held. 2313 */ 2314 void 2315 ttyrub(int c, struct tty *tp) 2316 { 2317 u_char *cp; 2318 int savecol, tabc; 2319 2320 KASSERT(mutex_owned(&tty_lock)); 2321 2322 if (!ISSET(tp->t_lflag, ECHO) || ISSET(tp->t_lflag, EXTPROC)) 2323 return; 2324 CLR(tp->t_lflag, FLUSHO); 2325 if (ISSET(tp->t_lflag, ECHOE)) { 2326 if (tp->t_rocount == 0) { 2327 /* 2328 * Screwed by ttwrite; retype 2329 */ 2330 ttyretype(tp); 2331 return; 2332 } 2333 if (c == ('\t' | TTY_QUOTE) || c == ('\n' | TTY_QUOTE)) 2334 ttyrubo(tp, 2); 2335 else { 2336 CLR(c, ~TTY_CHARMASK); 2337 switch (CCLASS(c)) { 2338 case ORDINARY: 2339 ttyrubo(tp, 1); 2340 break; 2341 case BACKSPACE: 2342 case CONTROL: 2343 case NEWLINE: 2344 case RETURN: 2345 case VTAB: 2346 if (ISSET(tp->t_lflag, ECHOCTL)) 2347 ttyrubo(tp, 2); 2348 break; 2349 case TAB: 2350 if (tp->t_rocount < tp->t_rawq.c_cc) { 2351 ttyretype(tp); 2352 return; 2353 } 2354 savecol = tp->t_column; 2355 SET(tp->t_state, TS_CNTTB); 2356 SET(tp->t_lflag, FLUSHO); 2357 tp->t_column = tp->t_rocol; 2358 for (cp = firstc(&tp->t_rawq, &tabc); cp; 2359 cp = nextc(&tp->t_rawq, cp, &tabc)) 2360 ttyecho(tabc, tp); 2361 CLR(tp->t_lflag, FLUSHO); 2362 CLR(tp->t_state, TS_CNTTB); 2363 2364 /* savecol will now be length of the tab. */ 2365 savecol -= tp->t_column; 2366 tp->t_column += savecol; 2367 if (savecol > 8) 2368 savecol = 8; /* overflow screw */ 2369 while (--savecol >= 0) 2370 (void)ttyoutput('\b', tp); 2371 break; 2372 default: /* XXX */ 2373 (void)printf("ttyrub: would panic c = %d, " 2374 "val = %d\n", c, CCLASS(c)); 2375 } 2376 } 2377 } else if (ISSET(tp->t_lflag, ECHOPRT)) { 2378 if (!ISSET(tp->t_state, TS_ERASE)) { 2379 SET(tp->t_state, TS_ERASE); 2380 (void)ttyoutput('\\', tp); 2381 } 2382 ttyecho(c, tp); 2383 } else 2384 ttyecho(tp->t_cc[VERASE], tp); 2385 --tp->t_rocount; 2386 } 2387 2388 /* 2389 * Back over cnt characters, erasing them. 2390 * Called with tty lock held. 2391 */ 2392 static void 2393 ttyrubo(struct tty *tp, int cnt) 2394 { 2395 2396 KASSERT(mutex_owned(&tty_lock)); 2397 2398 while (cnt-- > 0) { 2399 (void)ttyoutput('\b', tp); 2400 (void)ttyoutput(' ', tp); 2401 (void)ttyoutput('\b', tp); 2402 } 2403 } 2404 2405 /* 2406 * ttyretype -- 2407 * Reprint the rawq line. Note, it is assumed that c_cc has already 2408 * been checked. 2409 * 2410 * Called with tty lock held. 2411 */ 2412 void 2413 ttyretype(struct tty *tp) 2414 { 2415 u_char *cp; 2416 int c; 2417 2418 KASSERT(mutex_owned(&tty_lock)); 2419 2420 /* Echo the reprint character. */ 2421 if (tp->t_cc[VREPRINT] != _POSIX_VDISABLE) 2422 ttyecho(tp->t_cc[VREPRINT], tp); 2423 2424 (void)ttyoutput('\n', tp); 2425 2426 for (cp = firstc(&tp->t_canq, &c); cp; cp = nextc(&tp->t_canq, cp, &c)) 2427 ttyecho(c, tp); 2428 for (cp = firstc(&tp->t_rawq, &c); cp; cp = nextc(&tp->t_rawq, cp, &c)) 2429 ttyecho(c, tp); 2430 CLR(tp->t_state, TS_ERASE); 2431 2432 tp->t_rocount = tp->t_rawq.c_cc; 2433 tp->t_rocol = 0; 2434 } 2435 2436 /* 2437 * Echo a typed character to the terminal. 2438 * Called with tty lock held. 2439 */ 2440 static void 2441 ttyecho(int c, struct tty *tp) 2442 { 2443 2444 KASSERT(mutex_owned(&tty_lock)); 2445 2446 if (!ISSET(tp->t_state, TS_CNTTB)) 2447 CLR(tp->t_lflag, FLUSHO); 2448 if ((!ISSET(tp->t_lflag, ECHO) && 2449 (!ISSET(tp->t_lflag, ECHONL) || c != '\n')) || 2450 ISSET(tp->t_lflag, EXTPROC)) 2451 return; 2452 if (((ISSET(tp->t_lflag, ECHOCTL) && 2453 (ISSET(c, TTY_CHARMASK) <= 037 && c != '\t' && c != '\n')) || 2454 ISSET(c, TTY_CHARMASK) == 0177)) { 2455 (void)ttyoutput('^', tp); 2456 CLR(c, ~TTY_CHARMASK); 2457 if (c == 0177) 2458 c = '?'; 2459 else 2460 c += 'A' - 1; 2461 } 2462 (void)ttyoutput(c, tp); 2463 } 2464 2465 /* 2466 * Wake up any readers on a tty. 2467 * Called with tty lock held. 2468 */ 2469 void 2470 ttwakeup(struct tty *tp) 2471 { 2472 2473 KASSERT(mutex_owned(&tty_lock)); 2474 2475 selnotify(&tp->t_rsel, 0, NOTE_SUBMIT); 2476 if (ISSET(tp->t_state, TS_ASYNC)) 2477 ttysig(tp, TTYSIG_PG2, SIGIO); 2478 cv_broadcast(&tp->t_rawcv); 2479 } 2480 2481 /* 2482 * Look up a code for a specified speed in a conversion table; 2483 * used by drivers to map software speed values to hardware parameters. 2484 */ 2485 int 2486 ttspeedtab(int speed, const struct speedtab *table) 2487 { 2488 2489 for (; table->sp_speed != -1; table++) 2490 if (table->sp_speed == speed) 2491 return (table->sp_code); 2492 return (-1); 2493 } 2494 2495 /* 2496 * Set tty hi and low water marks. 2497 * 2498 * Try to arrange the dynamics so there's about one second 2499 * from hi to low water. 2500 */ 2501 void 2502 ttsetwater(struct tty *tp) 2503 { 2504 int cps, x; 2505 2506 /* XXX not yet KASSERT(mutex_owned(&tty_lock)); */ 2507 2508 #define CLAMP(x, h, l) ((x) > h ? h : ((x) < l) ? l : (x)) 2509 2510 cps = tp->t_ospeed / 10; 2511 tp->t_lowat = x = CLAMP(cps / 2, TTMAXLOWAT, TTMINLOWAT); 2512 x += cps; 2513 x = CLAMP(x, TTMAXHIWAT, TTMINHIWAT); 2514 tp->t_hiwat = roundup(x, TTROUND); 2515 #undef CLAMP 2516 } 2517 2518 /* 2519 * Prepare report on state of foreground process group. 2520 * Call with proc_lock held. 2521 */ 2522 void 2523 ttygetinfo(struct tty *tp, int fromsig, char *buf, size_t bufsz) 2524 { 2525 struct lwp *l; 2526 struct proc *p, *pick = NULL; 2527 struct timeval utime, stime; 2528 int tmp; 2529 fixpt_t pctcpu = 0; 2530 const char *msg; 2531 char lmsg[100]; 2532 long rss; 2533 2534 KASSERT(mutex_owned(proc_lock)); 2535 2536 *buf = '\0'; 2537 2538 if (tp->t_session == NULL) 2539 msg = "not a controlling terminal\n"; 2540 else if (tp->t_pgrp == NULL) 2541 msg = "no foreground process group\n"; 2542 else if ((p = LIST_FIRST(&tp->t_pgrp->pg_members)) == NULL) 2543 msg = "empty foreground process group\n"; 2544 else { 2545 /* Pick interesting process. */ 2546 for (; p != NULL; p = LIST_NEXT(p, p_pglist)) { 2547 struct proc *oldpick; 2548 2549 if (pick == NULL) { 2550 pick = p; 2551 continue; 2552 } 2553 if (pick->p_lock < p->p_lock) { 2554 mutex_enter(pick->p_lock); 2555 mutex_enter(p->p_lock); 2556 } else if (pick->p_lock > p->p_lock) { 2557 mutex_enter(p->p_lock); 2558 mutex_enter(pick->p_lock); 2559 } else 2560 mutex_enter(p->p_lock); 2561 oldpick = pick; 2562 if (proc_compare_wrapper(pick, p)) 2563 pick = p; 2564 mutex_exit(p->p_lock); 2565 if (p->p_lock != oldpick->p_lock) 2566 mutex_exit(oldpick->p_lock); 2567 } 2568 if (fromsig && 2569 (SIGACTION_PS(pick->p_sigacts, SIGINFO).sa_flags & 2570 SA_NOKERNINFO)) 2571 return; 2572 msg = NULL; 2573 } 2574 2575 /* Print load average. */ 2576 tmp = (averunnable.ldavg[0] * 100 + FSCALE / 2) >> FSHIFT; 2577 snprintf(lmsg, sizeof(lmsg), "load: %d.%02d ", tmp / 100, tmp % 100); 2578 strlcat(buf, lmsg, bufsz); 2579 2580 if (pick == NULL) { 2581 strlcat(buf, msg, bufsz); 2582 return; 2583 } 2584 2585 snprintf(lmsg, sizeof(lmsg), " cmd: %s %d [", pick->p_comm, 2586 pick->p_pid); 2587 strlcat(buf, lmsg, bufsz); 2588 2589 mutex_enter(pick->p_lock); 2590 LIST_FOREACH(l, &pick->p_lwps, l_sibling) { 2591 const char *lp; 2592 lwp_lock(l); 2593 #ifdef LWP_PC 2594 #define FMT_RUN "%#"PRIxVADDR 2595 #define VAL_RUNNING (vaddr_t)LWP_PC(l) 2596 #define VAL_RUNABLE (vaddr_t)LWP_PC(l) 2597 #else 2598 #define FMT_RUN "%s" 2599 #define VAL_RUNNING "running" 2600 #define VAL_RUNABLE "runnable" 2601 #endif 2602 switch (l->l_stat) { 2603 case LSONPROC: 2604 snprintf(lmsg, sizeof(lmsg), FMT_RUN"/%d", VAL_RUNNING, 2605 cpu_index(l->l_cpu)); 2606 lp = lmsg; 2607 break; 2608 case LSRUN: 2609 snprintf(lmsg, sizeof(lmsg), FMT_RUN, VAL_RUNABLE); 2610 lp = lmsg; 2611 break; 2612 default: 2613 lp = l->l_wchan ? l->l_wmesg : "iowait"; 2614 break; 2615 } 2616 strlcat(buf, lp, bufsz); 2617 strlcat(buf, LIST_NEXT(l, l_sibling) != NULL ? " " : "] ", 2618 bufsz); 2619 pctcpu += l->l_pctcpu; 2620 lwp_unlock(l); 2621 } 2622 pctcpu += pick->p_pctcpu; 2623 calcru(pick, &utime, &stime, NULL, NULL); 2624 mutex_exit(pick->p_lock); 2625 2626 /* Round up and print user+system time, %CPU and RSS. */ 2627 utime.tv_usec += 5000; 2628 if (utime.tv_usec >= 1000000) { 2629 utime.tv_sec += 1; 2630 utime.tv_usec -= 1000000; 2631 } 2632 stime.tv_usec += 5000; 2633 if (stime.tv_usec >= 1000000) { 2634 stime.tv_sec += 1; 2635 stime.tv_usec -= 1000000; 2636 } 2637 #define pgtok(a) (((u_long) ((a) * PAGE_SIZE) / 1024)) 2638 tmp = (pctcpu * 10000 + FSCALE / 2) >> FSHIFT; 2639 if (pick->p_stat == SIDL || P_ZOMBIE(pick)) 2640 rss = 0; 2641 else 2642 rss = pgtok(vm_resident_count(pick->p_vmspace)); 2643 2644 snprintf(lmsg, sizeof(lmsg), "%ld.%02ldu %ld.%02lds %d%% %ldk", 2645 (long)utime.tv_sec, (long)utime.tv_usec / 10000, 2646 (long)stime.tv_sec, (long)stime.tv_usec / 10000, 2647 tmp / 100, rss); 2648 strlcat(buf, lmsg, bufsz); 2649 } 2650 2651 /* 2652 * Print report on state of foreground process group. 2653 * Call with tty_lock held. 2654 */ 2655 void 2656 ttyputinfo(struct tty *tp, char *buf) 2657 { 2658 2659 KASSERT(mutex_owned(&tty_lock)); 2660 2661 if (ttycheckoutq_wlock(tp, 0) == 0) 2662 return; 2663 ttyprintf_nolock(tp, "%s\n", buf); 2664 tp->t_rocount = 0; /* so pending input will be retyped if BS */ 2665 } 2666 2667 /* 2668 * Returns 1 if p2 has a better chance being the active foreground process 2669 * in a terminal instead of p1. 2670 */ 2671 static int 2672 proc_compare_wrapper(struct proc *p1, struct proc *p2) 2673 { 2674 lwp_t *l1, *l2; 2675 2676 KASSERT(mutex_owned(p1->p_lock)); 2677 KASSERT(mutex_owned(p2->p_lock)); 2678 2679 if ((l1 = LIST_FIRST(&p1->p_lwps)) == NULL) 2680 return 1; 2681 2682 if ((l2 = LIST_FIRST(&p2->p_lwps)) == NULL) 2683 return 0; 2684 2685 return proc_compare(p1, l1, p2, l2); 2686 } 2687 2688 /* 2689 * Output char to tty; console putchar style. 2690 * Can be called with tty lock held through kprintf() machinery.. 2691 */ 2692 int 2693 tputchar(int c, int flags, struct tty *tp) 2694 { 2695 int r = 0; 2696 2697 if ((flags & NOLOCK) == 0) 2698 mutex_spin_enter(&tty_lock); 2699 if (!CONNECTED(tp)) { 2700 r = -1; 2701 goto out; 2702 } 2703 if (c == '\n') 2704 (void)ttyoutput('\r', tp); 2705 (void)ttyoutput(c, tp); 2706 ttstart(tp); 2707 out: 2708 if ((flags & NOLOCK) == 0) 2709 mutex_spin_exit(&tty_lock); 2710 return (r); 2711 } 2712 2713 /* 2714 * Sleep on chan, returning ERESTART if tty changed while we napped and 2715 * returning any errors (e.g. EINTR/EWOULDBLOCK) reported by 2716 * cv_timedwait(_sig). 2717 * If the tty is revoked, restarting a pending call will redo validation done 2718 * at the start of the call. 2719 * 2720 * Must be called with the tty lock held. 2721 */ 2722 int 2723 ttysleep(struct tty *tp, kcondvar_t *cv, bool catch_p, int timo) 2724 { 2725 int error; 2726 short gen; 2727 2728 KASSERT(mutex_owned(&tty_lock)); 2729 2730 gen = tp->t_gen; 2731 if (cv == NULL) 2732 error = kpause("ttypause", catch_p, timo, &tty_lock); 2733 else if (catch_p) 2734 error = cv_timedwait_sig(cv, &tty_lock, timo); 2735 else 2736 error = cv_timedwait(cv, &tty_lock, timo); 2737 if (error != 0) 2738 return (error); 2739 return (tp->t_gen == gen ? 0 : ERESTART); 2740 } 2741 2742 int 2743 ttypause(struct tty *tp, int timo) 2744 { 2745 int error; 2746 2747 error = ttysleep(tp, NULL, true, timo); 2748 if (error == EWOULDBLOCK) 2749 error = 0; 2750 return error; 2751 } 2752 2753 /* 2754 * Attach a tty to the tty list. 2755 * 2756 * This should be called ONLY once per real tty (including pty's). 2757 * eg, on the sparc, the keyboard and mouse have struct tty's that are 2758 * distinctly NOT usable as tty's, and thus should not be attached to 2759 * the ttylist. This is why this call is not done from tty_alloc(). 2760 * 2761 * Device drivers should attach tty's at a similar time that they are 2762 * allocated, or, for the case of statically allocated struct tty's 2763 * either in the attach or (first) open routine. 2764 */ 2765 void 2766 tty_attach(struct tty *tp) 2767 { 2768 2769 mutex_spin_enter(&tty_lock); 2770 TAILQ_INSERT_TAIL(&ttylist, tp, tty_link); 2771 ++tty_count; 2772 mutex_spin_exit(&tty_lock); 2773 } 2774 2775 /* 2776 * Remove a tty from the tty list. 2777 */ 2778 void 2779 tty_detach(struct tty *tp) 2780 { 2781 2782 mutex_spin_enter(&tty_lock); 2783 --tty_count; 2784 #ifdef DIAGNOSTIC 2785 if (tty_count < 0) 2786 panic("tty_detach: tty_count < 0"); 2787 #endif 2788 TAILQ_REMOVE(&ttylist, tp, tty_link); 2789 mutex_spin_exit(&tty_lock); 2790 } 2791 2792 /* 2793 * Allocate a tty structure and its associated buffers. 2794 */ 2795 struct tty * 2796 tty_alloc(void) 2797 { 2798 struct tty *tp; 2799 int i; 2800 2801 tp = kmem_zalloc(sizeof(*tp), KM_SLEEP); 2802 callout_init(&tp->t_rstrt_ch, 0); 2803 callout_setfunc(&tp->t_rstrt_ch, ttrstrt, tp); 2804 tp->t_qsize = tty_qsize; 2805 clalloc(&tp->t_rawq, tp->t_qsize, 1); 2806 cv_init(&tp->t_rawcv, "ttyraw"); 2807 cv_init(&tp->t_rawcvf, "ttyrawf"); 2808 clalloc(&tp->t_canq, tp->t_qsize, 1); 2809 cv_init(&tp->t_cancv, "ttycan"); 2810 cv_init(&tp->t_cancvf, "ttycanf"); 2811 /* output queue doesn't need quoting */ 2812 clalloc(&tp->t_outq, tp->t_qsize, 0); 2813 cv_init(&tp->t_outcv, "ttyout"); 2814 cv_init(&tp->t_outcvf, "ttyoutf"); 2815 /* Set default line discipline. */ 2816 tp->t_linesw = ttyldisc_default(); 2817 tp->t_dev = NODEV; 2818 selinit(&tp->t_rsel); 2819 selinit(&tp->t_wsel); 2820 for (i = 0; i < TTYSIG_COUNT; i++) { 2821 sigemptyset(&tp->t_sigs[i]); 2822 } 2823 2824 return tp; 2825 } 2826 2827 /* 2828 * Free a tty structure and its buffers. 2829 * 2830 * Be sure to call tty_detach() for any tty that has been 2831 * tty_attach()ed. 2832 */ 2833 void 2834 tty_free(struct tty *tp) 2835 { 2836 int i; 2837 2838 mutex_enter(proc_lock); 2839 mutex_enter(&tty_lock); 2840 for (i = 0; i < TTYSIG_COUNT; i++) 2841 sigemptyset(&tp->t_sigs[i]); 2842 if (tp->t_sigcount != 0) 2843 TAILQ_REMOVE(&tty_sigqueue, tp, t_sigqueue); 2844 mutex_exit(&tty_lock); 2845 mutex_exit(proc_lock); 2846 2847 callout_halt(&tp->t_rstrt_ch, NULL); 2848 callout_destroy(&tp->t_rstrt_ch); 2849 ttyldisc_release(tp->t_linesw); 2850 clfree(&tp->t_rawq); 2851 clfree(&tp->t_canq); 2852 clfree(&tp->t_outq); 2853 cv_destroy(&tp->t_rawcv); 2854 cv_destroy(&tp->t_rawcvf); 2855 cv_destroy(&tp->t_cancv); 2856 cv_destroy(&tp->t_cancvf); 2857 cv_destroy(&tp->t_outcv); 2858 cv_destroy(&tp->t_outcvf); 2859 seldestroy(&tp->t_rsel); 2860 seldestroy(&tp->t_wsel); 2861 kmem_free(tp, sizeof(*tp)); 2862 } 2863 2864 /* 2865 * ttyprintf_nolock: send a message to a specific tty, without locking. 2866 * 2867 * => should be used only by tty driver or anything that knows the 2868 * underlying tty will not be revoked(2)'d away. [otherwise, 2869 * use tprintf] 2870 */ 2871 static void 2872 ttyprintf_nolock(struct tty *tp, const char *fmt, ...) 2873 { 2874 va_list ap; 2875 2876 /* No mutex needed; going to process TTY. */ 2877 va_start(ap, fmt); 2878 kprintf(fmt, TOTTY|NOLOCK, tp, NULL, ap); 2879 va_end(ap); 2880 } 2881 2882 static int 2883 tty_listener_cb(kauth_cred_t cred, kauth_action_t action, void *cookie, 2884 void *arg0, void *arg1, void *arg2, void *arg3) 2885 { 2886 struct tty *tty; 2887 int result; 2888 2889 result = KAUTH_RESULT_DEFER; 2890 2891 if (action != KAUTH_DEVICE_TTY_OPEN) 2892 return result; 2893 2894 tty = arg0; 2895 2896 /* If it's not opened, we allow. */ 2897 if ((tty->t_state & TS_ISOPEN) == 0) 2898 result = KAUTH_RESULT_ALLOW; 2899 else { 2900 /* 2901 * If it's opened, we can only allow if it's not exclusively 2902 * opened; otherwise, that's a privileged operation and we 2903 * let the secmodel handle it. 2904 */ 2905 if ((tty->t_state & TS_XCLUDE) == 0) 2906 result = KAUTH_RESULT_ALLOW; 2907 } 2908 2909 return result; 2910 } 2911 2912 /* 2913 * Initialize the tty subsystem. 2914 */ 2915 void 2916 tty_init(void) 2917 { 2918 2919 mutex_init(&tty_lock, MUTEX_DEFAULT, IPL_VM); 2920 rw_init(&ttcompat_lock); 2921 tty_sigsih = softint_establish(SOFTINT_CLOCK, ttysigintr, NULL); 2922 KASSERT(tty_sigsih != NULL); 2923 2924 tty_listener = kauth_listen_scope(KAUTH_SCOPE_DEVICE, 2925 tty_listener_cb, NULL); 2926 2927 sysctl_kern_tty_setup(); 2928 } 2929 2930 /* 2931 * Send a signal from a tty to its process group or session leader. 2932 * Handoff to the target is deferred to a soft interrupt. 2933 */ 2934 void 2935 ttysig(struct tty *tp, enum ttysigtype st, int sig) 2936 { 2937 sigset_t *sp; 2938 2939 /* XXXSMP not yet KASSERT(mutex_owned(&tty_lock)); */ 2940 2941 sp = &tp->t_sigs[st]; 2942 if (sigismember(sp, sig)) 2943 return; 2944 sigaddset(sp, sig); 2945 if (tp->t_sigcount++ == 0) 2946 TAILQ_INSERT_TAIL(&tty_sigqueue, tp, t_sigqueue); 2947 softint_schedule(tty_sigsih); 2948 } 2949 2950 /* 2951 * Deliver deferred signals from ttys. Note that the process groups 2952 * and sessions associated with the ttys may have changed from when 2953 * the signal was originally sent, but in practice it should not matter. 2954 * For signals produced as a result of a syscall, the soft interrupt 2955 * will fire before the syscall returns to the user. 2956 */ 2957 static void 2958 ttysigintr(void *cookie) 2959 { 2960 struct tty *tp; 2961 enum ttysigtype st; 2962 struct pgrp *pgrp; 2963 struct session *sess; 2964 int sig, lflag; 2965 char infobuf[200]; 2966 2967 mutex_enter(proc_lock); 2968 mutex_spin_enter(&tty_lock); 2969 while ((tp = TAILQ_FIRST(&tty_sigqueue)) != NULL) { 2970 KASSERT(tp->t_sigcount > 0); 2971 for (st = TTYSIG_PG1; st < TTYSIG_COUNT; st++) { 2972 if ((sig = firstsig(&tp->t_sigs[st])) != 0) 2973 break; 2974 } 2975 KASSERT(st < TTYSIG_COUNT); 2976 sigdelset(&tp->t_sigs[st], sig); 2977 if (--tp->t_sigcount == 0) 2978 TAILQ_REMOVE(&tty_sigqueue, tp, t_sigqueue); 2979 pgrp = tp->t_pgrp; 2980 sess = tp->t_session; 2981 lflag = tp->t_lflag; 2982 if (sig == SIGINFO) { 2983 if (ISSET(tp->t_state, TS_SIGINFO)) { 2984 /* Via ioctl: ignore tty option. */ 2985 tp->t_state &= ~TS_SIGINFO; 2986 lflag |= ISIG; 2987 } 2988 if (!ISSET(lflag, NOKERNINFO)) { 2989 mutex_spin_exit(&tty_lock); 2990 ttygetinfo(tp, 1, infobuf, sizeof(infobuf)); 2991 mutex_spin_enter(&tty_lock); 2992 ttyputinfo(tp, infobuf); 2993 } 2994 if (!ISSET(lflag, ISIG)) 2995 continue; 2996 } 2997 mutex_spin_exit(&tty_lock); 2998 KASSERT(sig != 0); 2999 switch (st) { 3000 case TTYSIG_PG1: 3001 if (pgrp != NULL) 3002 pgsignal(pgrp, sig, 1); 3003 break; 3004 case TTYSIG_PG2: 3005 if (pgrp != NULL) 3006 pgsignal(pgrp, sig, sess != NULL); 3007 break; 3008 case TTYSIG_LEADER: 3009 if (sess != NULL && sess->s_leader != NULL) 3010 psignal(sess->s_leader, sig); 3011 break; 3012 default: 3013 /* NOTREACHED */ 3014 break; 3015 } 3016 mutex_spin_enter(&tty_lock); 3017 } 3018 mutex_spin_exit(&tty_lock); 3019 mutex_exit(proc_lock); 3020 } 3021 3022 unsigned char 3023 tty_getctrlchar(struct tty *tp, unsigned which) 3024 { 3025 KASSERT(which < NCCS); 3026 return tp->t_cc[which]; 3027 } 3028 3029 void 3030 tty_setctrlchar(struct tty *tp, unsigned which, unsigned char val) 3031 { 3032 KASSERT(which < NCCS); 3033 tp->t_cc[which] = val; 3034 } 3035 3036 int 3037 tty_try_xonxoff(struct tty *tp, unsigned char c) 3038 { 3039 const struct cdevsw *cdev; 3040 3041 if (tp->t_iflag & IXON) { 3042 if (c == tp->t_cc[VSTOP] && tp->t_cc[VSTOP] != _POSIX_VDISABLE) { 3043 if ((tp->t_state & TS_TTSTOP) == 0) { 3044 tp->t_state |= TS_TTSTOP; 3045 cdev = cdevsw_lookup(tp->t_dev); 3046 if (cdev != NULL) 3047 (*cdev->d_stop)(tp, 0); 3048 } 3049 return 0; 3050 } 3051 if (c == tp->t_cc[VSTART] && tp->t_cc[VSTART] != _POSIX_VDISABLE) { 3052 tp->t_state &= ~TS_TTSTOP; 3053 if (tp->t_oproc != NULL) { 3054 mutex_spin_enter(&tty_lock); /* XXX */ 3055 (*tp->t_oproc)(tp); 3056 mutex_spin_exit(&tty_lock); /* XXX */ 3057 } 3058 return 0; 3059 } 3060 } 3061 return EAGAIN; 3062 } 3063