tty.c revision 1.275.2.1
1 /* $NetBSD: tty.c,v 1.275.2.1 2018/03/18 12:06:59 pgoyette 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 1.275.2.1 2018/03/18 12:06:59 pgoyette 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 (*vec_compat_ttioctl_60)(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 /* We may have to load the compat module for this. */ 1412 for (;;) { 1413 rw_enter(&ttcompat_lock, RW_READER); 1414 if (vec_compat_ttioctl_60 != NULL) { 1415 break; 1416 } 1417 rw_exit(&ttcompat_lock); 1418 (void)module_autoload("compat", MODULE_CLASS_EXEC); 1419 if (vec_compat_ttioctl_60 == NULL) { 1420 return EPASSTHROUGH; 1421 } 1422 } 1423 error = (*vec_compat_ttioctl_60)(tp, cmd, data, flag, l); 1424 rw_exit(&ttcompat_lock); 1425 return error; 1426 } 1427 return (0); 1428 } 1429 1430 int 1431 ttpoll(struct tty *tp, int events, struct lwp *l) 1432 { 1433 int revents; 1434 1435 revents = 0; 1436 mutex_spin_enter(&tty_lock); 1437 if (events & (POLLIN | POLLRDNORM)) 1438 if (ttnread(tp) > 0) 1439 revents |= events & (POLLIN | POLLRDNORM); 1440 1441 if (events & (POLLOUT | POLLWRNORM)) 1442 if (tp->t_outq.c_cc <= tp->t_lowat) 1443 revents |= events & (POLLOUT | POLLWRNORM); 1444 1445 if (events & POLLHUP) 1446 if (!CONNECTED(tp)) 1447 revents |= POLLHUP; 1448 1449 if (revents == 0) { 1450 if (events & (POLLIN | POLLHUP | POLLRDNORM)) 1451 selrecord(l, &tp->t_rsel); 1452 1453 if (events & (POLLOUT | POLLWRNORM)) 1454 selrecord(l, &tp->t_wsel); 1455 } 1456 1457 mutex_spin_exit(&tty_lock); 1458 1459 return (revents); 1460 } 1461 1462 static void 1463 filt_ttyrdetach(struct knote *kn) 1464 { 1465 struct tty *tp; 1466 1467 tp = kn->kn_hook; 1468 mutex_spin_enter(&tty_lock); 1469 SLIST_REMOVE(&tp->t_rsel.sel_klist, kn, knote, kn_selnext); 1470 mutex_spin_exit(&tty_lock); 1471 } 1472 1473 static int 1474 filt_ttyread(struct knote *kn, long hint) 1475 { 1476 struct tty *tp; 1477 1478 tp = kn->kn_hook; 1479 if ((hint & NOTE_SUBMIT) == 0) 1480 mutex_spin_enter(&tty_lock); 1481 kn->kn_data = ttnread(tp); 1482 if ((hint & NOTE_SUBMIT) == 0) 1483 mutex_spin_exit(&tty_lock); 1484 return (kn->kn_data > 0); 1485 } 1486 1487 static void 1488 filt_ttywdetach(struct knote *kn) 1489 { 1490 struct tty *tp; 1491 1492 tp = kn->kn_hook; 1493 mutex_spin_enter(&tty_lock); 1494 SLIST_REMOVE(&tp->t_wsel.sel_klist, kn, knote, kn_selnext); 1495 mutex_spin_exit(&tty_lock); 1496 } 1497 1498 static int 1499 filt_ttywrite(struct knote *kn, long hint) 1500 { 1501 struct tty *tp; 1502 int canwrite; 1503 1504 tp = kn->kn_hook; 1505 if ((hint & NOTE_SUBMIT) == 0) 1506 mutex_spin_enter(&tty_lock); 1507 kn->kn_data = tp->t_outq.c_cn - tp->t_outq.c_cc; 1508 canwrite = (tp->t_outq.c_cc <= tp->t_lowat) && CONNECTED(tp); 1509 if ((hint & NOTE_SUBMIT) == 0) 1510 mutex_spin_exit(&tty_lock); 1511 return (canwrite); 1512 } 1513 1514 static const struct filterops ttyread_filtops = { 1515 .f_isfd = 1, 1516 .f_attach = NULL, 1517 .f_detach = filt_ttyrdetach, 1518 .f_event = filt_ttyread, 1519 }; 1520 1521 static const struct filterops ttywrite_filtops = { 1522 .f_isfd = 1, 1523 .f_attach = NULL, 1524 .f_detach = filt_ttywdetach, 1525 .f_event = filt_ttywrite, 1526 }; 1527 1528 int 1529 ttykqfilter(dev_t dev, struct knote *kn) 1530 { 1531 struct tty *tp; 1532 struct klist *klist; 1533 1534 if ((tp = cdev_tty(dev)) == NULL) 1535 return (ENXIO); 1536 1537 switch (kn->kn_filter) { 1538 case EVFILT_READ: 1539 klist = &tp->t_rsel.sel_klist; 1540 kn->kn_fop = &ttyread_filtops; 1541 break; 1542 case EVFILT_WRITE: 1543 klist = &tp->t_wsel.sel_klist; 1544 kn->kn_fop = &ttywrite_filtops; 1545 break; 1546 default: 1547 return EINVAL; 1548 } 1549 1550 kn->kn_hook = tp; 1551 1552 mutex_spin_enter(&tty_lock); 1553 SLIST_INSERT_HEAD(klist, kn, kn_selnext); 1554 mutex_spin_exit(&tty_lock); 1555 1556 return (0); 1557 } 1558 1559 /* 1560 * Find the number of chars ready to be read from this tty. 1561 * Call with the tty lock held. 1562 */ 1563 static int 1564 ttnread(struct tty *tp) 1565 { 1566 int nread; 1567 1568 KASSERT(mutex_owned(&tty_lock)); 1569 1570 if (ISSET(tp->t_lflag, PENDIN)) 1571 ttypend(tp); 1572 nread = tp->t_canq.c_cc; 1573 if (!ISSET(tp->t_lflag, ICANON)) { 1574 nread += tp->t_rawq.c_cc; 1575 if (nread < tp->t_cc[VMIN] && !tp->t_cc[VTIME]) 1576 nread = 0; 1577 } 1578 return (nread); 1579 } 1580 1581 /* 1582 * Wait for output to drain, or if this times out, flush it. 1583 */ 1584 static int 1585 ttywait_timo(struct tty *tp, int timo) 1586 { 1587 int error; 1588 1589 error = 0; 1590 1591 mutex_spin_enter(&tty_lock); 1592 while ((tp->t_outq.c_cc || ISSET(tp->t_state, TS_BUSY)) && 1593 CONNECTED(tp) && tp->t_oproc) { 1594 (*tp->t_oproc)(tp); 1595 error = ttysleep(tp, &tp->t_outcv, true, timo); 1596 if (error == EWOULDBLOCK) 1597 ttyflush(tp, FWRITE); 1598 if (error) 1599 break; 1600 } 1601 mutex_spin_exit(&tty_lock); 1602 1603 return (error); 1604 } 1605 1606 /* 1607 * Wait for output to drain. 1608 */ 1609 int 1610 ttywait(struct tty *tp) 1611 { 1612 return ttywait_timo(tp, 0); 1613 } 1614 1615 /* 1616 * Flush if successfully wait. 1617 */ 1618 int 1619 ttywflush(struct tty *tp) 1620 { 1621 int error; 1622 1623 error = ttywait_timo(tp, 5 * hz); 1624 if (error == 0 || error == EWOULDBLOCK) { 1625 mutex_spin_enter(&tty_lock); 1626 ttyflush(tp, FREAD); 1627 mutex_spin_exit(&tty_lock); 1628 } 1629 return (error); 1630 } 1631 1632 /* 1633 * Flush tty read and/or write queues, notifying anyone waiting. 1634 * Call with the tty lock held. 1635 */ 1636 void 1637 ttyflush(struct tty *tp, int rw) 1638 { 1639 1640 KASSERT(mutex_owned(&tty_lock)); 1641 1642 if (rw & FREAD) { 1643 FLUSHQ(&tp->t_canq); 1644 FLUSHQ(&tp->t_rawq); 1645 tp->t_rocount = 0; 1646 tp->t_rocol = 0; 1647 CLR(tp->t_state, TS_LOCAL); 1648 ttwakeup(tp); 1649 } 1650 if (rw & FWRITE) { 1651 CLR(tp->t_state, TS_TTSTOP); 1652 cdev_stop(tp, rw); 1653 FLUSHQ(&tp->t_outq); 1654 cv_broadcast(&tp->t_outcv); 1655 selnotify(&tp->t_wsel, 0, NOTE_SUBMIT); 1656 } 1657 } 1658 1659 /* 1660 * Copy in the default termios characters. 1661 */ 1662 void 1663 ttychars(struct tty *tp) 1664 { 1665 1666 memcpy(tp->t_cc, ttydefchars, sizeof(ttydefchars)); 1667 } 1668 1669 /* 1670 * Send stop character on input overflow. 1671 * Call with the tty lock held. 1672 */ 1673 static void 1674 ttyblock(struct tty *tp) 1675 { 1676 int total; 1677 1678 KASSERT(mutex_owned(&tty_lock)); 1679 1680 total = tp->t_rawq.c_cc + tp->t_canq.c_cc; 1681 if (tp->t_rawq.c_cc > TTYHOG) { 1682 ttyflush(tp, FREAD | FWRITE); 1683 CLR(tp->t_state, TS_TBLOCK); 1684 } 1685 /* 1686 * Block further input iff: current input > threshold 1687 * AND input is available to user program. 1688 */ 1689 if (total >= TTYHOG / 2 && 1690 !ISSET(tp->t_state, TS_TBLOCK) && 1691 (!ISSET(tp->t_lflag, ICANON) || tp->t_canq.c_cc > 0)) { 1692 if (ISSET(tp->t_iflag, IXOFF) && 1693 tp->t_cc[VSTOP] != _POSIX_VDISABLE && 1694 putc(tp->t_cc[VSTOP], &tp->t_outq) == 0) { 1695 SET(tp->t_state, TS_TBLOCK); 1696 ttstart(tp); 1697 } 1698 /* Try to block remote output via hardware flow control. */ 1699 if (ISSET(tp->t_cflag, CHWFLOW) && tp->t_hwiflow && 1700 (*tp->t_hwiflow)(tp, 1) != 0) 1701 SET(tp->t_state, TS_TBLOCK); 1702 } 1703 } 1704 1705 /* 1706 * Delayed line discipline output 1707 */ 1708 void 1709 ttrstrt(void *tp_arg) 1710 { 1711 struct tty *tp; 1712 1713 #ifdef DIAGNOSTIC 1714 if (tp_arg == NULL) 1715 panic("ttrstrt"); 1716 #endif 1717 tp = tp_arg; 1718 mutex_spin_enter(&tty_lock); 1719 1720 CLR(tp->t_state, TS_TIMEOUT); 1721 ttstart(tp); /* XXX - Shouldn't this be tp->l_start(tp)? */ 1722 1723 mutex_spin_exit(&tty_lock); 1724 } 1725 1726 /* 1727 * start a line discipline 1728 * Always call with tty lock held? 1729 */ 1730 int 1731 ttstart(struct tty *tp) 1732 { 1733 1734 if (tp->t_oproc != NULL) /* XXX: Kludge for pty. */ 1735 (*tp->t_oproc)(tp); 1736 return (0); 1737 } 1738 1739 /* 1740 * "close" a line discipline 1741 */ 1742 int 1743 ttylclose(struct tty *tp, int flag) 1744 { 1745 1746 if (flag & FNONBLOCK) { 1747 mutex_spin_enter(&tty_lock); 1748 ttyflush(tp, FREAD | FWRITE); 1749 mutex_spin_exit(&tty_lock); 1750 } else 1751 ttywflush(tp); 1752 return (0); 1753 } 1754 1755 /* 1756 * Handle modem control transition on a tty. 1757 * Flag indicates new state of carrier. 1758 * Returns 0 if the line should be turned off, otherwise 1. 1759 */ 1760 int 1761 ttymodem(struct tty *tp, int flag) 1762 { 1763 1764 mutex_spin_enter(&tty_lock); 1765 if (flag == 0) { 1766 if (ISSET(tp->t_state, TS_CARR_ON)) { 1767 /* 1768 * Lost carrier. 1769 */ 1770 CLR(tp->t_state, TS_CARR_ON); 1771 if (ISSET(tp->t_state, TS_ISOPEN) && !CONNECTED(tp)) { 1772 ttysig(tp, TTYSIG_LEADER, SIGHUP); 1773 ttyflush(tp, FREAD | FWRITE); 1774 mutex_spin_exit(&tty_lock); 1775 return (0); 1776 } 1777 } 1778 } else { 1779 if (!ISSET(tp->t_state, TS_CARR_ON)) { 1780 /* 1781 * Carrier now on. 1782 */ 1783 SET(tp->t_state, TS_CARR_ON); 1784 ttwakeup(tp); 1785 } 1786 } 1787 mutex_spin_exit(&tty_lock); 1788 1789 return (1); 1790 } 1791 1792 /* 1793 * Default modem control routine (for other line disciplines). 1794 * Return argument flag, to turn off device on carrier drop. 1795 */ 1796 int 1797 nullmodem(struct tty *tp, int flag) 1798 { 1799 1800 mutex_spin_enter(&tty_lock); 1801 if (flag) 1802 SET(tp->t_state, TS_CARR_ON); 1803 else { 1804 CLR(tp->t_state, TS_CARR_ON); 1805 if (!CONNECTED(tp)) { 1806 ttysig(tp, TTYSIG_LEADER, SIGHUP); 1807 mutex_spin_exit(&tty_lock); 1808 return (0); 1809 } 1810 } 1811 mutex_spin_exit(&tty_lock); 1812 1813 return (1); 1814 } 1815 1816 /* 1817 * Reinput pending characters after state switch. 1818 */ 1819 void 1820 ttypend(struct tty *tp) 1821 { 1822 struct clist tq; 1823 int c; 1824 1825 KASSERT(mutex_owned(&tty_lock)); 1826 1827 CLR(tp->t_lflag, PENDIN); 1828 SET(tp->t_state, TS_TYPEN); 1829 tq = tp->t_rawq; 1830 tp->t_rawq.c_cc = 0; 1831 tp->t_rawq.c_cf = tp->t_rawq.c_cl = 0; 1832 while ((c = getc(&tq)) >= 0) 1833 ttyinput_wlock(c, tp); 1834 CLR(tp->t_state, TS_TYPEN); 1835 } 1836 1837 /* 1838 * Process a read call on a tty device. 1839 */ 1840 int 1841 ttread(struct tty *tp, struct uio *uio, int flag) 1842 { 1843 struct clist *qp; 1844 u_char *cc; 1845 struct proc *p; 1846 int c, first, error, has_stime, last_cc; 1847 long lflag, slp; 1848 struct timeval now, stime; 1849 1850 if (uio->uio_resid == 0) 1851 return 0; 1852 1853 stime.tv_usec = 0; /* XXX gcc */ 1854 stime.tv_sec = 0; /* XXX gcc */ 1855 1856 cc = tp->t_cc; 1857 p = curproc; 1858 error = 0; 1859 has_stime = 0; 1860 last_cc = 0; 1861 slp = 0; 1862 1863 loop: 1864 mutex_spin_enter(&tty_lock); 1865 lflag = tp->t_lflag; 1866 /* 1867 * take pending input first 1868 */ 1869 if (ISSET(lflag, PENDIN)) 1870 ttypend(tp); 1871 1872 /* 1873 * Hang process if it's in the background. 1874 */ 1875 if (isbackground(p, tp)) { 1876 if (sigismasked(curlwp, SIGTTIN) || 1877 p->p_lflag & PL_PPWAIT || p->p_pgrp->pg_jobc == 0) { 1878 mutex_spin_exit(&tty_lock); 1879 return (EIO); 1880 } 1881 mutex_spin_exit(&tty_lock); 1882 1883 mutex_enter(proc_lock); 1884 pgsignal(p->p_pgrp, SIGTTIN, 1); 1885 mutex_exit(proc_lock); 1886 1887 mutex_spin_enter(&tty_lock); 1888 error = ttypause(tp, hz); 1889 mutex_spin_exit(&tty_lock); 1890 if (error) 1891 return (error); 1892 goto loop; 1893 } 1894 1895 if (!ISSET(lflag, ICANON)) { 1896 int m = cc[VMIN]; 1897 long t = cc[VTIME]; 1898 1899 qp = &tp->t_rawq; 1900 /* 1901 * Check each of the four combinations. 1902 * (m > 0 && t == 0) is the normal read case. 1903 * It should be fairly efficient, so we check that and its 1904 * companion case (m == 0 && t == 0) first. 1905 * For the other two cases, we compute the target sleep time 1906 * into slp. 1907 */ 1908 if (t == 0) { 1909 if (qp->c_cc < m) 1910 goto sleep; 1911 goto read; 1912 } 1913 t *= hz; /* time in deca-ticks */ 1914 /* 1915 * Time difference in deca-ticks, split division to avoid numeric overflow. 1916 * Ok for hz < ~200kHz 1917 */ 1918 #define diff(t1, t2) (((t1).tv_sec - (t2).tv_sec) * 10 * hz + \ 1919 ((t1).tv_usec - (t2).tv_usec) / 100 * hz / 1000) 1920 if (m > 0) { 1921 if (qp->c_cc <= 0) 1922 goto sleep; 1923 if (qp->c_cc >= m) 1924 goto read; 1925 if (!has_stime) { 1926 /* first character, start timer */ 1927 has_stime = 1; 1928 getmicrotime(&stime); 1929 slp = t; 1930 } else if (qp->c_cc > last_cc) { 1931 /* got a character, restart timer */ 1932 getmicrotime(&stime); 1933 slp = t; 1934 } else { 1935 /* nothing, check expiration */ 1936 getmicrotime(&now); 1937 slp = t - diff(now, stime); 1938 } 1939 } else { /* m == 0 */ 1940 if (qp->c_cc > 0) 1941 goto read; 1942 if (!has_stime) { 1943 has_stime = 1; 1944 getmicrotime(&stime); 1945 slp = t; 1946 } else { 1947 getmicrotime(&now); 1948 slp = t - diff(now, stime); 1949 } 1950 } 1951 last_cc = qp->c_cc; 1952 #undef diff 1953 if (slp > 0) { 1954 /* 1955 * Convert deca-ticks back to ticks. 1956 * Rounding down may make us wake up just short 1957 * of the target, so we round up. 1958 * Maybe we should do 'slp/10 + 1' because the 1959 * first tick maybe almost immediate. 1960 * However it is more useful for a program that sets 1961 * VTIME=10 to wakeup every second not every 1.01 1962 * seconds (if hz=100). 1963 */ 1964 slp = (slp + 9)/ 10; 1965 goto sleep; 1966 } 1967 } else if ((qp = &tp->t_canq)->c_cc <= 0) { 1968 int carrier; 1969 1970 sleep: 1971 /* 1972 * If there is no input, sleep on rawq 1973 * awaiting hardware receipt and notification. 1974 * If we have data, we don't need to check for carrier. 1975 */ 1976 carrier = CONNECTED(tp); 1977 if (!carrier && ISSET(tp->t_state, TS_ISOPEN)) { 1978 mutex_spin_exit(&tty_lock); 1979 return (0); /* EOF */ 1980 } 1981 if (!has_stime || slp <= 0) { 1982 if (flag & IO_NDELAY) { 1983 mutex_spin_exit(&tty_lock); 1984 return (EWOULDBLOCK); 1985 } 1986 } 1987 error = ttysleep(tp, &tp->t_rawcv, true, slp); 1988 mutex_spin_exit(&tty_lock); 1989 /* VMIN == 0: any quantity read satisfies */ 1990 if (cc[VMIN] == 0 && error == EWOULDBLOCK) 1991 return (0); 1992 if (error && error != EWOULDBLOCK) 1993 return (error); 1994 goto loop; 1995 } 1996 read: 1997 1998 /* 1999 * Input present, check for input mapping and processing. 2000 */ 2001 first = 1; 2002 while ((c = getc(qp)) >= 0) { 2003 /* 2004 * delayed suspend (^Y) 2005 */ 2006 if (CCEQ(cc[VDSUSP], c) && 2007 ISSET(lflag, IEXTEN|ISIG) == (IEXTEN|ISIG)) { 2008 ttysig(tp, TTYSIG_PG1, SIGTSTP); 2009 if (first) { 2010 error = ttypause(tp, hz); 2011 if (error) 2012 break; 2013 mutex_spin_exit(&tty_lock); 2014 goto loop; 2015 } 2016 break; 2017 } 2018 /* 2019 * Interpret EOF only in canonical mode. 2020 */ 2021 if (CCEQ(cc[VEOF], c) && ISSET(lflag, ICANON)) 2022 break; 2023 /* 2024 * Give user character. 2025 */ 2026 mutex_spin_exit(&tty_lock); 2027 error = ureadc(c, uio); 2028 mutex_spin_enter(&tty_lock); 2029 if (error) 2030 break; 2031 if (uio->uio_resid == 0) 2032 break; 2033 /* 2034 * In canonical mode check for a "break character" 2035 * marking the end of a "line of input". 2036 */ 2037 if (ISSET(lflag, ICANON) && TTBREAKC(c, lflag)) 2038 break; 2039 first = 0; 2040 } 2041 2042 /* 2043 * Look to unblock output now that (presumably) 2044 * the input queue has gone down. 2045 */ 2046 if (ISSET(tp->t_state, TS_TBLOCK) && tp->t_rawq.c_cc < TTYHOG / 5) { 2047 if (ISSET(tp->t_iflag, IXOFF) && 2048 cc[VSTART] != _POSIX_VDISABLE && 2049 putc(cc[VSTART], &tp->t_outq) == 0) { 2050 CLR(tp->t_state, TS_TBLOCK); 2051 ttstart(tp); 2052 } 2053 /* Try to unblock remote output via hardware flow control. */ 2054 if (ISSET(tp->t_cflag, CHWFLOW) && tp->t_hwiflow && 2055 (*tp->t_hwiflow)(tp, 0) != 0) 2056 CLR(tp->t_state, TS_TBLOCK); 2057 } 2058 mutex_spin_exit(&tty_lock); 2059 2060 return (error); 2061 } 2062 2063 /* 2064 * Check the output queue on tp for space for a kernel message (from uprintf 2065 * or tprintf). Allow some space over the normal hiwater mark so we don't 2066 * lose messages due to normal flow control, but don't let the tty run amok. 2067 * Sleeps here are not interruptible, but we return prematurely if new signals 2068 * arrive. 2069 * Call with tty lock held. 2070 */ 2071 static int 2072 ttycheckoutq_wlock(struct tty *tp, int wait) 2073 { 2074 int hiwat, error; 2075 2076 KASSERT(mutex_owned(&tty_lock)); 2077 2078 hiwat = tp->t_hiwat; 2079 if (tp->t_outq.c_cc > hiwat + 200) 2080 while (tp->t_outq.c_cc > hiwat) { 2081 ttstart(tp); 2082 if (wait == 0) 2083 return (0); 2084 error = ttysleep(tp, &tp->t_outcv, true, hz); 2085 if (error == EINTR) 2086 wait = 0; 2087 } 2088 2089 return (1); 2090 } 2091 2092 int 2093 ttycheckoutq(struct tty *tp, int wait) 2094 { 2095 int r; 2096 2097 mutex_spin_enter(&tty_lock); 2098 r = ttycheckoutq_wlock(tp, wait); 2099 mutex_spin_exit(&tty_lock); 2100 2101 return (r); 2102 } 2103 2104 /* 2105 * Process a write call on a tty device. 2106 */ 2107 int 2108 ttwrite(struct tty *tp, struct uio *uio, int flag) 2109 { 2110 u_char *cp; 2111 struct proc *p; 2112 int cc, ce, i, hiwat, error; 2113 u_char obuf[OBUFSIZ]; 2114 2115 cp = NULL; 2116 hiwat = tp->t_hiwat; 2117 error = 0; 2118 cc = 0; 2119 loop: 2120 mutex_spin_enter(&tty_lock); 2121 if (!CONNECTED(tp)) { 2122 if (ISSET(tp->t_state, TS_ISOPEN)) { 2123 mutex_spin_exit(&tty_lock); 2124 return (EIO); 2125 } else if (flag & IO_NDELAY) { 2126 mutex_spin_exit(&tty_lock); 2127 error = EWOULDBLOCK; 2128 goto out; 2129 } else { 2130 /* Sleep awaiting carrier. */ 2131 error = ttysleep(tp, &tp->t_rawcv, true, 0); 2132 mutex_spin_exit(&tty_lock); 2133 if (error) 2134 goto out; 2135 goto loop; 2136 } 2137 } 2138 2139 /* 2140 * Hang the process if it's in the background. 2141 */ 2142 p = curproc; 2143 if (isbackground(p, tp) && 2144 ISSET(tp->t_lflag, TOSTOP) && (p->p_lflag & PL_PPWAIT) == 0 && 2145 !sigismasked(curlwp, SIGTTOU)) { 2146 if (p->p_pgrp->pg_jobc == 0) { 2147 error = EIO; 2148 mutex_spin_exit(&tty_lock); 2149 goto out; 2150 } 2151 mutex_spin_exit(&tty_lock); 2152 2153 mutex_enter(proc_lock); 2154 pgsignal(p->p_pgrp, SIGTTOU, 1); 2155 mutex_exit(proc_lock); 2156 2157 mutex_spin_enter(&tty_lock); 2158 error = ttypause(tp, hz); 2159 mutex_spin_exit(&tty_lock); 2160 if (error) 2161 goto out; 2162 goto loop; 2163 } 2164 mutex_spin_exit(&tty_lock); 2165 2166 /* 2167 * Process the user's data in at most OBUFSIZ chunks. Perform any 2168 * output translation. Keep track of high water mark, sleep on 2169 * overflow awaiting device aid in acquiring new space. 2170 */ 2171 while (uio->uio_resid > 0 || cc > 0) { 2172 if (ISSET(tp->t_lflag, FLUSHO)) { 2173 uio->uio_resid = 0; 2174 return (0); 2175 } 2176 if (tp->t_outq.c_cc > hiwat) 2177 goto ovhiwat; 2178 /* 2179 * Grab a hunk of data from the user, unless we have some 2180 * leftover from last time. 2181 */ 2182 if (cc == 0) { 2183 cc = min(uio->uio_resid, OBUFSIZ); 2184 cp = obuf; 2185 error = uiomove(cp, cc, uio); 2186 if (error) { 2187 cc = 0; 2188 goto out; 2189 } 2190 } 2191 /* 2192 * If nothing fancy need be done, grab those characters we 2193 * can handle without any of ttyoutput's processing and 2194 * just transfer them to the output q. For those chars 2195 * which require special processing (as indicated by the 2196 * bits in char_type), call ttyoutput. After processing 2197 * a hunk of data, look for FLUSHO so ^O's will take effect 2198 * immediately. 2199 */ 2200 mutex_spin_enter(&tty_lock); 2201 while (cc > 0) { 2202 if (!ISSET(tp->t_oflag, OPOST)) 2203 ce = cc; 2204 else { 2205 ce = cc - scanc((u_int)cc, cp, char_type, 2206 CCLASSMASK); 2207 /* 2208 * If ce is zero, then we're processing 2209 * a special character through ttyoutput. 2210 */ 2211 if (ce == 0) { 2212 tp->t_rocount = 0; 2213 if (ttyoutput(*cp, tp) >= 0) { 2214 /* out of space */ 2215 mutex_spin_exit(&tty_lock); 2216 goto overfull; 2217 } 2218 cp++; 2219 cc--; 2220 if (ISSET(tp->t_lflag, FLUSHO) || 2221 tp->t_outq.c_cc > hiwat) { 2222 mutex_spin_exit(&tty_lock); 2223 goto ovhiwat; 2224 } 2225 continue; 2226 } 2227 } 2228 /* 2229 * A bunch of normal characters have been found. 2230 * Transfer them en masse to the output queue and 2231 * continue processing at the top of the loop. 2232 * If there are any further characters in this 2233 * <= OBUFSIZ chunk, the first should be a character 2234 * requiring special handling by ttyoutput. 2235 */ 2236 tp->t_rocount = 0; 2237 i = b_to_q(cp, ce, &tp->t_outq); 2238 ce -= i; 2239 tp->t_column += ce; 2240 cp += ce, cc -= ce, tk_nout += ce; 2241 tp->t_outcc += ce; 2242 if (i > 0) { 2243 /* out of space */ 2244 mutex_spin_exit(&tty_lock); 2245 goto overfull; 2246 } 2247 if (ISSET(tp->t_lflag, FLUSHO) || 2248 tp->t_outq.c_cc > hiwat) 2249 break; 2250 } 2251 ttstart(tp); 2252 mutex_spin_exit(&tty_lock); 2253 } 2254 2255 out: 2256 /* 2257 * If cc is nonzero, we leave the uio structure inconsistent, as the 2258 * offset and iov pointers have moved forward, but it doesn't matter 2259 * (the call will either return short or restart with a new uio). 2260 */ 2261 uio->uio_resid += cc; 2262 return (error); 2263 2264 overfull: 2265 /* 2266 * Since we are using ring buffers, if we can't insert any more into 2267 * the output queue, we can assume the ring is full and that someone 2268 * forgot to set the high water mark correctly. We set it and then 2269 * proceed as normal. 2270 */ 2271 hiwat = tp->t_outq.c_cc - 1; 2272 2273 ovhiwat: 2274 mutex_spin_enter(&tty_lock); 2275 ttstart(tp); 2276 /* 2277 * This can only occur if FLUSHO is set in t_lflag, 2278 * or if ttstart/oproc is synchronous (or very fast). 2279 */ 2280 if (tp->t_outq.c_cc <= hiwat) { 2281 mutex_spin_exit(&tty_lock); 2282 goto loop; 2283 } 2284 if (flag & IO_NDELAY) { 2285 mutex_spin_exit(&tty_lock); 2286 error = EWOULDBLOCK; 2287 goto out; 2288 } 2289 error = ttysleep(tp, &tp->t_outcv, true, 0); 2290 mutex_spin_exit(&tty_lock); 2291 if (error) 2292 goto out; 2293 goto loop; 2294 } 2295 2296 /* 2297 * Try to pull more output from the producer. Return non-zero if 2298 * there is output ready to be sent. 2299 */ 2300 bool 2301 ttypull(struct tty *tp) 2302 { 2303 2304 /* XXXSMP not yet KASSERT(mutex_owned(&tty_lock)); */ 2305 2306 if (tp->t_outq.c_cc <= tp->t_lowat) { 2307 cv_broadcast(&tp->t_outcv); 2308 selnotify(&tp->t_wsel, 0, NOTE_SUBMIT); 2309 } 2310 return tp->t_outq.c_cc != 0; 2311 } 2312 2313 /* 2314 * Rubout one character from the rawq of tp 2315 * as cleanly as possible. 2316 * Called with tty lock held. 2317 */ 2318 void 2319 ttyrub(int c, struct tty *tp) 2320 { 2321 u_char *cp; 2322 int savecol, tabc; 2323 2324 KASSERT(mutex_owned(&tty_lock)); 2325 2326 if (!ISSET(tp->t_lflag, ECHO) || ISSET(tp->t_lflag, EXTPROC)) 2327 return; 2328 CLR(tp->t_lflag, FLUSHO); 2329 if (ISSET(tp->t_lflag, ECHOE)) { 2330 if (tp->t_rocount == 0) { 2331 /* 2332 * Screwed by ttwrite; retype 2333 */ 2334 ttyretype(tp); 2335 return; 2336 } 2337 if (c == ('\t' | TTY_QUOTE) || c == ('\n' | TTY_QUOTE)) 2338 ttyrubo(tp, 2); 2339 else { 2340 CLR(c, ~TTY_CHARMASK); 2341 switch (CCLASS(c)) { 2342 case ORDINARY: 2343 ttyrubo(tp, 1); 2344 break; 2345 case BACKSPACE: 2346 case CONTROL: 2347 case NEWLINE: 2348 case RETURN: 2349 case VTAB: 2350 if (ISSET(tp->t_lflag, ECHOCTL)) 2351 ttyrubo(tp, 2); 2352 break; 2353 case TAB: 2354 if (tp->t_rocount < tp->t_rawq.c_cc) { 2355 ttyretype(tp); 2356 return; 2357 } 2358 savecol = tp->t_column; 2359 SET(tp->t_state, TS_CNTTB); 2360 SET(tp->t_lflag, FLUSHO); 2361 tp->t_column = tp->t_rocol; 2362 for (cp = firstc(&tp->t_rawq, &tabc); cp; 2363 cp = nextc(&tp->t_rawq, cp, &tabc)) 2364 ttyecho(tabc, tp); 2365 CLR(tp->t_lflag, FLUSHO); 2366 CLR(tp->t_state, TS_CNTTB); 2367 2368 /* savecol will now be length of the tab. */ 2369 savecol -= tp->t_column; 2370 tp->t_column += savecol; 2371 if (savecol > 8) 2372 savecol = 8; /* overflow screw */ 2373 while (--savecol >= 0) 2374 (void)ttyoutput('\b', tp); 2375 break; 2376 default: /* XXX */ 2377 (void)printf("ttyrub: would panic c = %d, " 2378 "val = %d\n", c, CCLASS(c)); 2379 } 2380 } 2381 } else if (ISSET(tp->t_lflag, ECHOPRT)) { 2382 if (!ISSET(tp->t_state, TS_ERASE)) { 2383 SET(tp->t_state, TS_ERASE); 2384 (void)ttyoutput('\\', tp); 2385 } 2386 ttyecho(c, tp); 2387 } else 2388 ttyecho(tp->t_cc[VERASE], tp); 2389 --tp->t_rocount; 2390 } 2391 2392 /* 2393 * Back over cnt characters, erasing them. 2394 * Called with tty lock held. 2395 */ 2396 static void 2397 ttyrubo(struct tty *tp, int cnt) 2398 { 2399 2400 KASSERT(mutex_owned(&tty_lock)); 2401 2402 while (cnt-- > 0) { 2403 (void)ttyoutput('\b', tp); 2404 (void)ttyoutput(' ', tp); 2405 (void)ttyoutput('\b', tp); 2406 } 2407 } 2408 2409 /* 2410 * ttyretype -- 2411 * Reprint the rawq line. Note, it is assumed that c_cc has already 2412 * been checked. 2413 * 2414 * Called with tty lock held. 2415 */ 2416 void 2417 ttyretype(struct tty *tp) 2418 { 2419 u_char *cp; 2420 int c; 2421 2422 KASSERT(mutex_owned(&tty_lock)); 2423 2424 /* Echo the reprint character. */ 2425 if (tp->t_cc[VREPRINT] != _POSIX_VDISABLE) 2426 ttyecho(tp->t_cc[VREPRINT], tp); 2427 2428 (void)ttyoutput('\n', tp); 2429 2430 for (cp = firstc(&tp->t_canq, &c); cp; cp = nextc(&tp->t_canq, cp, &c)) 2431 ttyecho(c, tp); 2432 for (cp = firstc(&tp->t_rawq, &c); cp; cp = nextc(&tp->t_rawq, cp, &c)) 2433 ttyecho(c, tp); 2434 CLR(tp->t_state, TS_ERASE); 2435 2436 tp->t_rocount = tp->t_rawq.c_cc; 2437 tp->t_rocol = 0; 2438 } 2439 2440 /* 2441 * Echo a typed character to the terminal. 2442 * Called with tty lock held. 2443 */ 2444 static void 2445 ttyecho(int c, struct tty *tp) 2446 { 2447 2448 KASSERT(mutex_owned(&tty_lock)); 2449 2450 if (!ISSET(tp->t_state, TS_CNTTB)) 2451 CLR(tp->t_lflag, FLUSHO); 2452 if ((!ISSET(tp->t_lflag, ECHO) && 2453 (!ISSET(tp->t_lflag, ECHONL) || c != '\n')) || 2454 ISSET(tp->t_lflag, EXTPROC)) 2455 return; 2456 if (((ISSET(tp->t_lflag, ECHOCTL) && 2457 (ISSET(c, TTY_CHARMASK) <= 037 && c != '\t' && c != '\n')) || 2458 ISSET(c, TTY_CHARMASK) == 0177)) { 2459 (void)ttyoutput('^', tp); 2460 CLR(c, ~TTY_CHARMASK); 2461 if (c == 0177) 2462 c = '?'; 2463 else 2464 c += 'A' - 1; 2465 } 2466 (void)ttyoutput(c, tp); 2467 } 2468 2469 /* 2470 * Wake up any readers on a tty. 2471 * Called with tty lock held. 2472 */ 2473 void 2474 ttwakeup(struct tty *tp) 2475 { 2476 2477 KASSERT(mutex_owned(&tty_lock)); 2478 2479 selnotify(&tp->t_rsel, 0, NOTE_SUBMIT); 2480 if (ISSET(tp->t_state, TS_ASYNC)) 2481 ttysig(tp, TTYSIG_PG2, SIGIO); 2482 cv_broadcast(&tp->t_rawcv); 2483 } 2484 2485 /* 2486 * Look up a code for a specified speed in a conversion table; 2487 * used by drivers to map software speed values to hardware parameters. 2488 */ 2489 int 2490 ttspeedtab(int speed, const struct speedtab *table) 2491 { 2492 2493 for (; table->sp_speed != -1; table++) 2494 if (table->sp_speed == speed) 2495 return (table->sp_code); 2496 return (-1); 2497 } 2498 2499 /* 2500 * Set tty hi and low water marks. 2501 * 2502 * Try to arrange the dynamics so there's about one second 2503 * from hi to low water. 2504 */ 2505 void 2506 ttsetwater(struct tty *tp) 2507 { 2508 int cps, x; 2509 2510 /* XXX not yet KASSERT(mutex_owned(&tty_lock)); */ 2511 2512 #define CLAMP(x, h, l) ((x) > h ? h : ((x) < l) ? l : (x)) 2513 2514 cps = tp->t_ospeed / 10; 2515 tp->t_lowat = x = CLAMP(cps / 2, TTMAXLOWAT, TTMINLOWAT); 2516 x += cps; 2517 x = CLAMP(x, TTMAXHIWAT, TTMINHIWAT); 2518 tp->t_hiwat = roundup(x, TTROUND); 2519 #undef CLAMP 2520 } 2521 2522 /* 2523 * Prepare report on state of foreground process group. 2524 * Call with proc_lock held. 2525 */ 2526 void 2527 ttygetinfo(struct tty *tp, int fromsig, char *buf, size_t bufsz) 2528 { 2529 struct lwp *l; 2530 struct proc *p, *pick = NULL; 2531 struct timeval utime, stime; 2532 int tmp; 2533 fixpt_t pctcpu = 0; 2534 const char *msg; 2535 char lmsg[100]; 2536 long rss; 2537 2538 KASSERT(mutex_owned(proc_lock)); 2539 2540 *buf = '\0'; 2541 2542 if (tp->t_session == NULL) 2543 msg = "not a controlling terminal\n"; 2544 else if (tp->t_pgrp == NULL) 2545 msg = "no foreground process group\n"; 2546 else if ((p = LIST_FIRST(&tp->t_pgrp->pg_members)) == NULL) 2547 msg = "empty foreground process group\n"; 2548 else { 2549 /* Pick interesting process. */ 2550 for (; p != NULL; p = LIST_NEXT(p, p_pglist)) { 2551 struct proc *oldpick; 2552 2553 if (pick == NULL) { 2554 pick = p; 2555 continue; 2556 } 2557 if (pick->p_lock < p->p_lock) { 2558 mutex_enter(pick->p_lock); 2559 mutex_enter(p->p_lock); 2560 } else if (pick->p_lock > p->p_lock) { 2561 mutex_enter(p->p_lock); 2562 mutex_enter(pick->p_lock); 2563 } else 2564 mutex_enter(p->p_lock); 2565 oldpick = pick; 2566 if (proc_compare_wrapper(pick, p)) 2567 pick = p; 2568 mutex_exit(p->p_lock); 2569 if (p->p_lock != oldpick->p_lock) 2570 mutex_exit(oldpick->p_lock); 2571 } 2572 if (fromsig && 2573 (SIGACTION_PS(pick->p_sigacts, SIGINFO).sa_flags & 2574 SA_NOKERNINFO)) 2575 return; 2576 msg = NULL; 2577 } 2578 2579 /* Print load average. */ 2580 tmp = (averunnable.ldavg[0] * 100 + FSCALE / 2) >> FSHIFT; 2581 snprintf(lmsg, sizeof(lmsg), "load: %d.%02d ", tmp / 100, tmp % 100); 2582 strlcat(buf, lmsg, bufsz); 2583 2584 if (pick == NULL) { 2585 strlcat(buf, msg, bufsz); 2586 return; 2587 } 2588 2589 snprintf(lmsg, sizeof(lmsg), " cmd: %s %d [", pick->p_comm, 2590 pick->p_pid); 2591 strlcat(buf, lmsg, bufsz); 2592 2593 mutex_enter(pick->p_lock); 2594 LIST_FOREACH(l, &pick->p_lwps, l_sibling) { 2595 const char *lp; 2596 lwp_lock(l); 2597 #ifdef LWP_PC 2598 #define FMT_RUN "%#"PRIxVADDR 2599 #define VAL_RUNNING (vaddr_t)LWP_PC(l) 2600 #define VAL_RUNABLE (vaddr_t)LWP_PC(l) 2601 #else 2602 #define FMT_RUN "%s" 2603 #define VAL_RUNNING "running" 2604 #define VAL_RUNABLE "runnable" 2605 #endif 2606 switch (l->l_stat) { 2607 case LSONPROC: 2608 snprintf(lmsg, sizeof(lmsg), FMT_RUN"/%d", VAL_RUNNING, 2609 cpu_index(l->l_cpu)); 2610 lp = lmsg; 2611 break; 2612 case LSRUN: 2613 snprintf(lmsg, sizeof(lmsg), FMT_RUN, VAL_RUNABLE); 2614 lp = lmsg; 2615 break; 2616 default: 2617 lp = l->l_wchan ? l->l_wmesg : "iowait"; 2618 break; 2619 } 2620 strlcat(buf, lp, bufsz); 2621 strlcat(buf, LIST_NEXT(l, l_sibling) != NULL ? " " : "] ", 2622 bufsz); 2623 pctcpu += l->l_pctcpu; 2624 lwp_unlock(l); 2625 } 2626 pctcpu += pick->p_pctcpu; 2627 calcru(pick, &utime, &stime, NULL, NULL); 2628 mutex_exit(pick->p_lock); 2629 2630 /* Round up and print user+system time, %CPU and RSS. */ 2631 utime.tv_usec += 5000; 2632 if (utime.tv_usec >= 1000000) { 2633 utime.tv_sec += 1; 2634 utime.tv_usec -= 1000000; 2635 } 2636 stime.tv_usec += 5000; 2637 if (stime.tv_usec >= 1000000) { 2638 stime.tv_sec += 1; 2639 stime.tv_usec -= 1000000; 2640 } 2641 #define pgtok(a) (((u_long) ((a) * PAGE_SIZE) / 1024)) 2642 tmp = (pctcpu * 10000 + FSCALE / 2) >> FSHIFT; 2643 if (pick->p_stat == SIDL || P_ZOMBIE(pick)) 2644 rss = 0; 2645 else 2646 rss = pgtok(vm_resident_count(pick->p_vmspace)); 2647 2648 snprintf(lmsg, sizeof(lmsg), "%ld.%02ldu %ld.%02lds %d%% %ldk", 2649 (long)utime.tv_sec, (long)utime.tv_usec / 10000, 2650 (long)stime.tv_sec, (long)stime.tv_usec / 10000, 2651 tmp / 100, rss); 2652 strlcat(buf, lmsg, bufsz); 2653 } 2654 2655 /* 2656 * Print report on state of foreground process group. 2657 * Call with tty_lock held. 2658 */ 2659 void 2660 ttyputinfo(struct tty *tp, char *buf) 2661 { 2662 2663 KASSERT(mutex_owned(&tty_lock)); 2664 2665 if (ttycheckoutq_wlock(tp, 0) == 0) 2666 return; 2667 ttyprintf_nolock(tp, "%s\n", buf); 2668 tp->t_rocount = 0; /* so pending input will be retyped if BS */ 2669 } 2670 2671 /* 2672 * Returns 1 if p2 has a better chance being the active foreground process 2673 * in a terminal instead of p1. 2674 */ 2675 static int 2676 proc_compare_wrapper(struct proc *p1, struct proc *p2) 2677 { 2678 lwp_t *l1, *l2; 2679 2680 KASSERT(mutex_owned(p1->p_lock)); 2681 KASSERT(mutex_owned(p2->p_lock)); 2682 2683 if ((l1 = LIST_FIRST(&p1->p_lwps)) == NULL) 2684 return 1; 2685 2686 if ((l2 = LIST_FIRST(&p2->p_lwps)) == NULL) 2687 return 0; 2688 2689 return proc_compare(p1, l1, p2, l2); 2690 } 2691 2692 /* 2693 * Output char to tty; console putchar style. 2694 * Can be called with tty lock held through kprintf() machinery.. 2695 */ 2696 int 2697 tputchar(int c, int flags, struct tty *tp) 2698 { 2699 int r = 0; 2700 2701 if ((flags & NOLOCK) == 0) 2702 mutex_spin_enter(&tty_lock); 2703 if (!CONNECTED(tp)) { 2704 r = -1; 2705 goto out; 2706 } 2707 if (c == '\n') 2708 (void)ttyoutput('\r', tp); 2709 (void)ttyoutput(c, tp); 2710 ttstart(tp); 2711 out: 2712 if ((flags & NOLOCK) == 0) 2713 mutex_spin_exit(&tty_lock); 2714 return (r); 2715 } 2716 2717 /* 2718 * Sleep on chan, returning ERESTART if tty changed while we napped and 2719 * returning any errors (e.g. EINTR/EWOULDBLOCK) reported by 2720 * cv_timedwait(_sig). 2721 * If the tty is revoked, restarting a pending call will redo validation done 2722 * at the start of the call. 2723 * 2724 * Must be called with the tty lock held. 2725 */ 2726 int 2727 ttysleep(struct tty *tp, kcondvar_t *cv, bool catch_p, int timo) 2728 { 2729 int error; 2730 short gen; 2731 2732 KASSERT(mutex_owned(&tty_lock)); 2733 2734 gen = tp->t_gen; 2735 if (cv == NULL) 2736 error = kpause("ttypause", catch_p, timo, &tty_lock); 2737 else if (catch_p) 2738 error = cv_timedwait_sig(cv, &tty_lock, timo); 2739 else 2740 error = cv_timedwait(cv, &tty_lock, timo); 2741 if (error != 0) 2742 return (error); 2743 return (tp->t_gen == gen ? 0 : ERESTART); 2744 } 2745 2746 int 2747 ttypause(struct tty *tp, int timo) 2748 { 2749 int error; 2750 2751 error = ttysleep(tp, NULL, true, timo); 2752 if (error == EWOULDBLOCK) 2753 error = 0; 2754 return error; 2755 } 2756 2757 /* 2758 * Attach a tty to the tty list. 2759 * 2760 * This should be called ONLY once per real tty (including pty's). 2761 * eg, on the sparc, the keyboard and mouse have struct tty's that are 2762 * distinctly NOT usable as tty's, and thus should not be attached to 2763 * the ttylist. This is why this call is not done from tty_alloc(). 2764 * 2765 * Device drivers should attach tty's at a similar time that they are 2766 * allocated, or, for the case of statically allocated struct tty's 2767 * either in the attach or (first) open routine. 2768 */ 2769 void 2770 tty_attach(struct tty *tp) 2771 { 2772 2773 mutex_spin_enter(&tty_lock); 2774 TAILQ_INSERT_TAIL(&ttylist, tp, tty_link); 2775 ++tty_count; 2776 mutex_spin_exit(&tty_lock); 2777 } 2778 2779 /* 2780 * Remove a tty from the tty list. 2781 */ 2782 void 2783 tty_detach(struct tty *tp) 2784 { 2785 2786 mutex_spin_enter(&tty_lock); 2787 --tty_count; 2788 #ifdef DIAGNOSTIC 2789 if (tty_count < 0) 2790 panic("tty_detach: tty_count < 0"); 2791 #endif 2792 TAILQ_REMOVE(&ttylist, tp, tty_link); 2793 mutex_spin_exit(&tty_lock); 2794 } 2795 2796 /* 2797 * Allocate a tty structure and its associated buffers. 2798 */ 2799 struct tty * 2800 tty_alloc(void) 2801 { 2802 struct tty *tp; 2803 int i; 2804 2805 tp = kmem_zalloc(sizeof(*tp), KM_SLEEP); 2806 callout_init(&tp->t_rstrt_ch, 0); 2807 callout_setfunc(&tp->t_rstrt_ch, ttrstrt, tp); 2808 tp->t_qsize = tty_qsize; 2809 clalloc(&tp->t_rawq, tp->t_qsize, 1); 2810 cv_init(&tp->t_rawcv, "ttyraw"); 2811 cv_init(&tp->t_rawcvf, "ttyrawf"); 2812 clalloc(&tp->t_canq, tp->t_qsize, 1); 2813 cv_init(&tp->t_cancv, "ttycan"); 2814 cv_init(&tp->t_cancvf, "ttycanf"); 2815 /* output queue doesn't need quoting */ 2816 clalloc(&tp->t_outq, tp->t_qsize, 0); 2817 cv_init(&tp->t_outcv, "ttyout"); 2818 cv_init(&tp->t_outcvf, "ttyoutf"); 2819 /* Set default line discipline. */ 2820 tp->t_linesw = ttyldisc_default(); 2821 tp->t_dev = NODEV; 2822 selinit(&tp->t_rsel); 2823 selinit(&tp->t_wsel); 2824 for (i = 0; i < TTYSIG_COUNT; i++) { 2825 sigemptyset(&tp->t_sigs[i]); 2826 } 2827 2828 return tp; 2829 } 2830 2831 /* 2832 * Free a tty structure and its buffers. 2833 * 2834 * Be sure to call tty_detach() for any tty that has been 2835 * tty_attach()ed. 2836 */ 2837 void 2838 tty_free(struct tty *tp) 2839 { 2840 int i; 2841 2842 mutex_enter(proc_lock); 2843 mutex_enter(&tty_lock); 2844 for (i = 0; i < TTYSIG_COUNT; i++) 2845 sigemptyset(&tp->t_sigs[i]); 2846 if (tp->t_sigcount != 0) 2847 TAILQ_REMOVE(&tty_sigqueue, tp, t_sigqueue); 2848 mutex_exit(&tty_lock); 2849 mutex_exit(proc_lock); 2850 2851 callout_halt(&tp->t_rstrt_ch, NULL); 2852 callout_destroy(&tp->t_rstrt_ch); 2853 ttyldisc_release(tp->t_linesw); 2854 clfree(&tp->t_rawq); 2855 clfree(&tp->t_canq); 2856 clfree(&tp->t_outq); 2857 cv_destroy(&tp->t_rawcv); 2858 cv_destroy(&tp->t_rawcvf); 2859 cv_destroy(&tp->t_cancv); 2860 cv_destroy(&tp->t_cancvf); 2861 cv_destroy(&tp->t_outcv); 2862 cv_destroy(&tp->t_outcvf); 2863 seldestroy(&tp->t_rsel); 2864 seldestroy(&tp->t_wsel); 2865 kmem_free(tp, sizeof(*tp)); 2866 } 2867 2868 /* 2869 * ttyprintf_nolock: send a message to a specific tty, without locking. 2870 * 2871 * => should be used only by tty driver or anything that knows the 2872 * underlying tty will not be revoked(2)'d away. [otherwise, 2873 * use tprintf] 2874 */ 2875 static void 2876 ttyprintf_nolock(struct tty *tp, const char *fmt, ...) 2877 { 2878 va_list ap; 2879 2880 /* No mutex needed; going to process TTY. */ 2881 va_start(ap, fmt); 2882 kprintf(fmt, TOTTY|NOLOCK, tp, NULL, ap); 2883 va_end(ap); 2884 } 2885 2886 static int 2887 tty_listener_cb(kauth_cred_t cred, kauth_action_t action, void *cookie, 2888 void *arg0, void *arg1, void *arg2, void *arg3) 2889 { 2890 struct tty *tty; 2891 int result; 2892 2893 result = KAUTH_RESULT_DEFER; 2894 2895 if (action != KAUTH_DEVICE_TTY_OPEN) 2896 return result; 2897 2898 tty = arg0; 2899 2900 /* If it's not opened, we allow. */ 2901 if ((tty->t_state & TS_ISOPEN) == 0) 2902 result = KAUTH_RESULT_ALLOW; 2903 else { 2904 /* 2905 * If it's opened, we can only allow if it's not exclusively 2906 * opened; otherwise, that's a privileged operation and we 2907 * let the secmodel handle it. 2908 */ 2909 if ((tty->t_state & TS_XCLUDE) == 0) 2910 result = KAUTH_RESULT_ALLOW; 2911 } 2912 2913 return result; 2914 } 2915 2916 /* 2917 * Initialize the tty subsystem. 2918 */ 2919 void 2920 tty_init(void) 2921 { 2922 2923 mutex_init(&tty_lock, MUTEX_DEFAULT, IPL_VM); 2924 rw_init(&ttcompat_lock); 2925 tty_sigsih = softint_establish(SOFTINT_CLOCK, ttysigintr, NULL); 2926 KASSERT(tty_sigsih != NULL); 2927 2928 tty_listener = kauth_listen_scope(KAUTH_SCOPE_DEVICE, 2929 tty_listener_cb, NULL); 2930 2931 sysctl_kern_tty_setup(); 2932 } 2933 2934 /* 2935 * Send a signal from a tty to its process group or session leader. 2936 * Handoff to the target is deferred to a soft interrupt. 2937 */ 2938 void 2939 ttysig(struct tty *tp, enum ttysigtype st, int sig) 2940 { 2941 sigset_t *sp; 2942 2943 /* XXXSMP not yet KASSERT(mutex_owned(&tty_lock)); */ 2944 2945 sp = &tp->t_sigs[st]; 2946 if (sigismember(sp, sig)) 2947 return; 2948 sigaddset(sp, sig); 2949 if (tp->t_sigcount++ == 0) 2950 TAILQ_INSERT_TAIL(&tty_sigqueue, tp, t_sigqueue); 2951 softint_schedule(tty_sigsih); 2952 } 2953 2954 /* 2955 * Deliver deferred signals from ttys. Note that the process groups 2956 * and sessions associated with the ttys may have changed from when 2957 * the signal was originally sent, but in practice it should not matter. 2958 * For signals produced as a result of a syscall, the soft interrupt 2959 * will fire before the syscall returns to the user. 2960 */ 2961 static void 2962 ttysigintr(void *cookie) 2963 { 2964 struct tty *tp; 2965 enum ttysigtype st; 2966 struct pgrp *pgrp; 2967 struct session *sess; 2968 int sig, lflag; 2969 char infobuf[200]; 2970 2971 mutex_enter(proc_lock); 2972 mutex_spin_enter(&tty_lock); 2973 while ((tp = TAILQ_FIRST(&tty_sigqueue)) != NULL) { 2974 KASSERT(tp->t_sigcount > 0); 2975 for (st = TTYSIG_PG1; st < TTYSIG_COUNT; st++) { 2976 if ((sig = firstsig(&tp->t_sigs[st])) != 0) 2977 break; 2978 } 2979 KASSERT(st < TTYSIG_COUNT); 2980 sigdelset(&tp->t_sigs[st], sig); 2981 if (--tp->t_sigcount == 0) 2982 TAILQ_REMOVE(&tty_sigqueue, tp, t_sigqueue); 2983 pgrp = tp->t_pgrp; 2984 sess = tp->t_session; 2985 lflag = tp->t_lflag; 2986 if (sig == SIGINFO) { 2987 if (ISSET(tp->t_state, TS_SIGINFO)) { 2988 /* Via ioctl: ignore tty option. */ 2989 tp->t_state &= ~TS_SIGINFO; 2990 lflag |= ISIG; 2991 } 2992 if (!ISSET(lflag, NOKERNINFO)) { 2993 mutex_spin_exit(&tty_lock); 2994 ttygetinfo(tp, 1, infobuf, sizeof(infobuf)); 2995 mutex_spin_enter(&tty_lock); 2996 ttyputinfo(tp, infobuf); 2997 } 2998 if (!ISSET(lflag, ISIG)) 2999 continue; 3000 } 3001 mutex_spin_exit(&tty_lock); 3002 KASSERT(sig != 0); 3003 switch (st) { 3004 case TTYSIG_PG1: 3005 if (pgrp != NULL) 3006 pgsignal(pgrp, sig, 1); 3007 break; 3008 case TTYSIG_PG2: 3009 if (pgrp != NULL) 3010 pgsignal(pgrp, sig, sess != NULL); 3011 break; 3012 case TTYSIG_LEADER: 3013 if (sess != NULL && sess->s_leader != NULL) 3014 psignal(sess->s_leader, sig); 3015 break; 3016 default: 3017 /* NOTREACHED */ 3018 break; 3019 } 3020 mutex_spin_enter(&tty_lock); 3021 } 3022 mutex_spin_exit(&tty_lock); 3023 mutex_exit(proc_lock); 3024 } 3025 3026 unsigned char 3027 tty_getctrlchar(struct tty *tp, unsigned which) 3028 { 3029 KASSERT(which < NCCS); 3030 return tp->t_cc[which]; 3031 } 3032 3033 void 3034 tty_setctrlchar(struct tty *tp, unsigned which, unsigned char val) 3035 { 3036 KASSERT(which < NCCS); 3037 tp->t_cc[which] = val; 3038 } 3039 3040 int 3041 tty_try_xonxoff(struct tty *tp, unsigned char c) 3042 { 3043 const struct cdevsw *cdev; 3044 3045 if (tp->t_iflag & IXON) { 3046 if (c == tp->t_cc[VSTOP] && tp->t_cc[VSTOP] != _POSIX_VDISABLE) { 3047 if ((tp->t_state & TS_TTSTOP) == 0) { 3048 tp->t_state |= TS_TTSTOP; 3049 cdev = cdevsw_lookup(tp->t_dev); 3050 if (cdev != NULL) 3051 (*cdev->d_stop)(tp, 0); 3052 } 3053 return 0; 3054 } 3055 if (c == tp->t_cc[VSTART] && tp->t_cc[VSTART] != _POSIX_VDISABLE) { 3056 tp->t_state &= ~TS_TTSTOP; 3057 if (tp->t_oproc != NULL) { 3058 mutex_spin_enter(&tty_lock); /* XXX */ 3059 (*tp->t_oproc)(tp); 3060 mutex_spin_exit(&tty_lock); /* XXX */ 3061 } 3062 return 0; 3063 } 3064 } 3065 return EAGAIN; 3066 } 3067
Indexes created Tue Sep 30 10:09:55 GMT 2025