Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/kern/tty_cons.c
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1 /* 2 * Copyright (c) 1988 University of Utah. 3 * Copyright (c) 1991 The Regents of the University of California. 4 * All rights reserved. 5 * 6 * This code is derived from software contributed to Berkeley by 7 * the Systems Programming Group of the University of Utah Computer 8 * Science Department. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the University of 21 * California, Berkeley and its contributors. 22 * 4. Neither the name of the University nor the names of its contributors 23 * may be used to endorse or promote products derived from this software 24 * without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36 * SUCH DAMAGE. 37 * 38 * from: @(#)cons.c 7.2 (Berkeley) 5/9/91 39 * $FreeBSD: releng/5.1/sys/kern/tty_cons.c 112046 2003-03-09 20:42:49Z phk $ 40 */ 41 42 #include "opt_ddb.h" 43 44 #include <sys/param.h> 45 #include <sys/systm.h> 46 #include <sys/conf.h> 47 #include <sys/cons.h> 48 #include <sys/fcntl.h> 49 #include <sys/kernel.h> 50 #include <sys/malloc.h> 51 #include <sys/namei.h> 52 #include <sys/proc.h> 53 #include <sys/queue.h> 54 #include <sys/reboot.h> 55 #include <sys/sysctl.h> 56 #include <sys/tty.h> 57 #include <sys/uio.h> 58 #include <sys/vnode.h> 59 60 #include <ddb/ddb.h> 61 62 #include <machine/cpu.h> 63 64 static d_open_t cnopen; 65 static d_close_t cnclose; 66 static d_read_t cnread; 67 static d_write_t cnwrite; 68 static d_ioctl_t cnioctl; 69 static d_poll_t cnpoll; 70 static d_kqfilter_t cnkqfilter; 71 72 static struct cdevsw cn_cdevsw = { 73 .d_open = cnopen, 74 .d_close = cnclose, 75 .d_read = cnread, 76 .d_write = cnwrite, 77 .d_ioctl = cnioctl, 78 .d_poll = cnpoll, 79 .d_name = "console", 80 .d_maj = 256, 81 /* 82 * XXX: We really want major #0, but zero here means 83 * XXX: allocate a major number automatically. 84 * XXX: kern_conf.c knows what to do when it sees 256. 85 */ 86 .d_flags = D_TTY, 87 .d_kqfilter = cnkqfilter, 88 }; 89 90 struct cn_device { 91 STAILQ_ENTRY(cn_device) cnd_next; 92 char cnd_name[16]; 93 struct vnode *cnd_vp; 94 struct consdev *cnd_cn; 95 }; 96 97 #define CNDEVPATHMAX 32 98 #define CNDEVTAB_SIZE 4 99 static struct cn_device cn_devtab[CNDEVTAB_SIZE]; 100 static STAILQ_HEAD(, cn_device) cn_devlist = 101 STAILQ_HEAD_INITIALIZER(cn_devlist); 102 103 #define CND_INVALID(cnd, td) \ 104 (cnd == NULL || cnd->cnd_vp == NULL || \ 105 (cnd->cnd_vp->v_type == VBAD && !cn_devopen(cnd, td, 1))) 106 107 static udev_t cn_udev_t; 108 SYSCTL_OPAQUE(_machdep, CPU_CONSDEV, consdev, CTLFLAG_RD, 109 &cn_udev_t, sizeof cn_udev_t, "T,dev_t", ""); 110 111 int cons_unavail = 0; /* XXX: 112 * physical console not available for 113 * input (i.e., it is in graphics mode) 114 */ 115 static int cn_mute; 116 static int openflag; /* how /dev/console was opened */ 117 static int cn_is_open; 118 static u_char console_pausing; /* pause after each line during probe */ 119 static char *console_pausestr= 120 "<pause; press any key to proceed to next line or '.' to end pause mode>"; 121 122 void cndebug(char *); 123 124 CONS_DRIVER(cons, NULL, NULL, NULL, NULL, NULL, NULL, NULL); 125 SET_DECLARE(cons_set, struct consdev); 126 127 void 128 cninit(void) 129 { 130 struct consdev *best_cn, *cn, **list; 131 132 /* 133 * Check if we should mute the console (for security reasons perhaps) 134 * It can be changes dynamically using sysctl kern.consmute 135 * once we are up and going. 136 * 137 */ 138 cn_mute = ((boothowto & (RB_MUTE 139 |RB_SINGLE 140 |RB_VERBOSE 141 |RB_ASKNAME 142 |RB_CONFIG)) == RB_MUTE); 143 144 /* 145 * Find the first console with the highest priority. 146 */ 147 best_cn = NULL; 148 SET_FOREACH(list, cons_set) { 149 cn = *list; 150 cnremove(cn); 151 if (cn->cn_probe == NULL) 152 continue; 153 cn->cn_probe(cn); 154 if (cn->cn_pri == CN_DEAD) 155 continue; 156 if (best_cn == NULL || cn->cn_pri > best_cn->cn_pri) 157 best_cn = cn; 158 if (boothowto & RB_MULTIPLE) { 159 /* 160 * Initialize console, and attach to it. 161 */ 162 cnadd(cn); 163 cn->cn_init(cn); 164 } 165 } 166 if (best_cn == NULL) 167 return; 168 if ((boothowto & RB_MULTIPLE) == 0) { 169 cnadd(best_cn); 170 best_cn->cn_init(best_cn); 171 } 172 if (boothowto & RB_PAUSE) 173 console_pausing = 1; 174 /* 175 * Make the best console the preferred console. 176 */ 177 cnselect(best_cn); 178 } 179 180 void 181 cninit_finish() 182 { 183 console_pausing = 0; 184 } 185 186 /* add a new physical console to back the virtual console */ 187 int 188 cnadd(struct consdev *cn) 189 { 190 struct cn_device *cnd; 191 int i; 192 193 STAILQ_FOREACH(cnd, &cn_devlist, cnd_next) 194 if (cnd->cnd_cn == cn) 195 return (0); 196 for (i = 0; i < CNDEVTAB_SIZE; i++) { 197 cnd = &cn_devtab[i]; 198 if (cnd->cnd_cn == NULL) 199 break; 200 } 201 if (cnd->cnd_cn != NULL) 202 return (ENOMEM); 203 cnd->cnd_cn = cn; 204 STAILQ_INSERT_TAIL(&cn_devlist, cnd, cnd_next); 205 return (0); 206 } 207 208 void 209 cnremove(struct consdev *cn) 210 { 211 struct cn_device *cnd; 212 213 STAILQ_FOREACH(cnd, &cn_devlist, cnd_next) { 214 if (cnd->cnd_cn != cn) 215 continue; 216 STAILQ_REMOVE(&cn_devlist, cnd, cn_device, cnd_next); 217 if (cnd->cnd_vp != NULL) 218 vn_close(cnd->cnd_vp, openflag, NOCRED, NULL); 219 cnd->cnd_vp = NULL; 220 cnd->cnd_cn = NULL; 221 cnd->cnd_name[0] = '\0'; 222 #if 0 223 /* 224 * XXX 225 * syscons gets really confused if console resources are 226 * freed after the system has initialized. 227 */ 228 if (cn->cn_term != NULL) 229 cn->cn_term(cn); 230 #endif 231 return; 232 } 233 } 234 235 void 236 cnselect(struct consdev *cn) 237 { 238 struct cn_device *cnd; 239 240 STAILQ_FOREACH(cnd, &cn_devlist, cnd_next) { 241 if (cnd->cnd_cn != cn) 242 continue; 243 if (cnd == STAILQ_FIRST(&cn_devlist)) 244 return; 245 STAILQ_REMOVE(&cn_devlist, cnd, cn_device, cnd_next); 246 STAILQ_INSERT_HEAD(&cn_devlist, cnd, cnd_next); 247 return; 248 } 249 } 250 251 void 252 cndebug(char *str) 253 { 254 int i, len; 255 256 len = strlen(str); 257 cnputc('>'); cnputc('>'); cnputc('>'); cnputc(' '); 258 for (i = 0; i < len; i++) 259 cnputc(str[i]); 260 cnputc('\n'); 261 } 262 263 static int 264 sysctl_kern_console(SYSCTL_HANDLER_ARGS) 265 { 266 struct cn_device *cnd; 267 struct consdev *cp, **list; 268 char *name, *p; 269 int delete, len, error; 270 271 len = 2; 272 SET_FOREACH(list, cons_set) { 273 cp = *list; 274 if (cp->cn_dev != NULL) 275 len += strlen(devtoname(cp->cn_dev)) + 1; 276 } 277 STAILQ_FOREACH(cnd, &cn_devlist, cnd_next) 278 len += strlen(devtoname(cnd->cnd_cn->cn_dev)) + 1; 279 len = len > CNDEVPATHMAX ? len : CNDEVPATHMAX; 280 MALLOC(name, char *, len, M_TEMP, M_WAITOK | M_ZERO); 281 p = name; 282 STAILQ_FOREACH(cnd, &cn_devlist, cnd_next) 283 p += sprintf(p, "%s,", devtoname(cnd->cnd_cn->cn_dev)); 284 *p++ = '/'; 285 SET_FOREACH(list, cons_set) { 286 cp = *list; 287 if (cp->cn_dev != NULL) 288 p += sprintf(p, "%s,", devtoname(cp->cn_dev)); 289 } 290 error = sysctl_handle_string(oidp, name, len, req); 291 if (error == 0 && req->newptr != NULL) { 292 p = name; 293 error = ENXIO; 294 delete = 0; 295 if (*p == '-') { 296 delete = 1; 297 p++; 298 } 299 SET_FOREACH(list, cons_set) { 300 cp = *list; 301 if (cp->cn_dev == NULL || 302 strcmp(p, devtoname(cp->cn_dev)) != 0) 303 continue; 304 if (delete) { 305 cnremove(cp); 306 error = 0; 307 } else { 308 error = cnadd(cp); 309 if (error == 0) 310 cnselect(cp); 311 } 312 break; 313 } 314 } 315 FREE(name, M_TEMP); 316 return (error); 317 } 318 319 SYSCTL_PROC(_kern, OID_AUTO, console, CTLTYPE_STRING|CTLFLAG_RW, 320 0, 0, sysctl_kern_console, "A", "Console device control"); 321 322 /* 323 * User has changed the state of the console muting. 324 * This may require us to open or close the device in question. 325 */ 326 static int 327 sysctl_kern_consmute(SYSCTL_HANDLER_ARGS) 328 { 329 int error; 330 int ocn_mute; 331 332 ocn_mute = cn_mute; 333 error = sysctl_handle_int(oidp, &cn_mute, 0, req); 334 if (error != 0 || req->newptr == NULL) 335 return (error); 336 if (ocn_mute && !cn_mute && cn_is_open) 337 error = cnopen(NODEV, openflag, 0, curthread); 338 else if (!ocn_mute && cn_mute && cn_is_open) { 339 error = cnclose(NODEV, openflag, 0, curthread); 340 cn_is_open = 1; /* XXX hack */ 341 } 342 return (error); 343 } 344 345 SYSCTL_PROC(_kern, OID_AUTO, consmute, CTLTYPE_INT|CTLFLAG_RW, 346 0, sizeof(cn_mute), sysctl_kern_consmute, "I", ""); 347 348 static int 349 cn_devopen(struct cn_device *cnd, struct thread *td, int forceopen) 350 { 351 char path[CNDEVPATHMAX]; 352 struct nameidata nd; 353 struct vnode *vp; 354 dev_t dev; 355 int error; 356 357 if ((vp = cnd->cnd_vp) != NULL) { 358 if (!forceopen && vp->v_type != VBAD) { 359 dev = vp->v_rdev; 360 return ((*devsw(dev)->d_open)(dev, openflag, 0, td)); 361 } 362 cnd->cnd_vp = NULL; 363 vn_close(vp, openflag, td->td_ucred, td); 364 } 365 if (cnd->cnd_name[0] == '\0') { 366 strlcpy(cnd->cnd_name, devtoname(cnd->cnd_cn->cn_dev), 367 sizeof(cnd->cnd_name)); 368 } 369 snprintf(path, sizeof(path), "/dev/%s", cnd->cnd_name); 370 NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, path, td); 371 error = vn_open(&nd, &openflag, 0); 372 if (error == 0) { 373 NDFREE(&nd, NDF_ONLY_PNBUF); 374 VOP_UNLOCK(nd.ni_vp, 0, td); 375 if (nd.ni_vp->v_type == VCHR) 376 cnd->cnd_vp = nd.ni_vp; 377 else 378 vn_close(nd.ni_vp, openflag, td->td_ucred, td); 379 } 380 return (cnd->cnd_vp != NULL); 381 } 382 383 static int 384 cnopen(dev_t dev, int flag, int mode, struct thread *td) 385 { 386 struct cn_device *cnd; 387 388 openflag = flag | FWRITE; /* XXX */ 389 cn_is_open = 1; /* console is logically open */ 390 if (cn_mute) 391 return (0); 392 STAILQ_FOREACH(cnd, &cn_devlist, cnd_next) 393 cn_devopen(cnd, td, 0); 394 return (0); 395 } 396 397 static int 398 cnclose(dev_t dev, int flag, int mode, struct thread *td) 399 { 400 struct cn_device *cnd; 401 struct vnode *vp; 402 403 STAILQ_FOREACH(cnd, &cn_devlist, cnd_next) { 404 if ((vp = cnd->cnd_vp) == NULL) 405 continue; 406 cnd->cnd_vp = NULL; 407 vn_close(vp, openflag, td->td_ucred, td); 408 } 409 cn_is_open = 0; 410 return (0); 411 } 412 413 static int 414 cnread(dev_t dev, struct uio *uio, int flag) 415 { 416 struct cn_device *cnd; 417 418 cnd = STAILQ_FIRST(&cn_devlist); 419 if (cn_mute || CND_INVALID(cnd, curthread)) 420 return (0); 421 dev = cnd->cnd_vp->v_rdev; 422 return ((*devsw(dev)->d_read)(dev, uio, flag)); 423 } 424 425 static int 426 cnwrite(dev_t dev, struct uio *uio, int flag) 427 { 428 struct cn_device *cnd; 429 430 cnd = STAILQ_FIRST(&cn_devlist); 431 if (cn_mute || CND_INVALID(cnd, curthread)) 432 goto done; 433 if (constty) 434 dev = constty->t_dev; 435 else 436 dev = cnd->cnd_vp->v_rdev; 437 if (dev != NULL) { 438 log_console(uio); 439 return ((*devsw(dev)->d_write)(dev, uio, flag)); 440 } 441 done: 442 uio->uio_resid = 0; /* dump the data */ 443 return (0); 444 } 445 446 static int 447 cnioctl(dev_t dev, u_long cmd, caddr_t data, int flag, struct thread *td) 448 { 449 struct cn_device *cnd; 450 int error; 451 452 cnd = STAILQ_FIRST(&cn_devlist); 453 if (cn_mute || CND_INVALID(cnd, td)) 454 return (0); 455 /* 456 * Superuser can always use this to wrest control of console 457 * output from the "virtual" console. 458 */ 459 if (cmd == TIOCCONS && constty) { 460 error = suser(td); 461 if (error) 462 return (error); 463 constty = NULL; 464 return (0); 465 } 466 dev = cnd->cnd_vp->v_rdev; 467 if (dev != NULL) 468 return ((*devsw(dev)->d_ioctl)(dev, cmd, data, flag, td)); 469 return (0); 470 } 471 472 /* 473 * XXX 474 * poll/kqfilter do not appear to be correct 475 */ 476 static int 477 cnpoll(dev_t dev, int events, struct thread *td) 478 { 479 struct cn_device *cnd; 480 481 cnd = STAILQ_FIRST(&cn_devlist); 482 if (cn_mute || CND_INVALID(cnd, td)) 483 return (0); 484 dev = cnd->cnd_vp->v_rdev; 485 if (dev != NULL) 486 return ((*devsw(dev)->d_poll)(dev, events, td)); 487 return (0); 488 } 489 490 static int 491 cnkqfilter(dev_t dev, struct knote *kn) 492 { 493 struct cn_device *cnd; 494 495 cnd = STAILQ_FIRST(&cn_devlist); 496 if (cn_mute || CND_INVALID(cnd, curthread)) 497 return (1); 498 dev = cnd->cnd_vp->v_rdev; 499 if (dev != NULL) 500 return ((*devsw(dev)->d_kqfilter)(dev, kn)); 501 return (1); 502 } 503 504 /* 505 * Low level console routines. 506 */ 507 int 508 cngetc(void) 509 { 510 int c; 511 512 if (cn_mute) 513 return (-1); 514 while ((c = cncheckc()) == -1) 515 ; 516 if (c == '\r') 517 c = '\n'; /* console input is always ICRNL */ 518 return (c); 519 } 520 521 int 522 cncheckc(void) 523 { 524 struct cn_device *cnd; 525 struct consdev *cn; 526 int c; 527 528 if (cn_mute) 529 return (-1); 530 STAILQ_FOREACH(cnd, &cn_devlist, cnd_next) { 531 cn = cnd->cnd_cn; 532 c = cn->cn_checkc(cn); 533 if (c != -1) { 534 return (c); 535 } 536 } 537 return (-1); 538 } 539 540 void 541 cnputc(int c) 542 { 543 struct cn_device *cnd; 544 struct consdev *cn; 545 char *cp; 546 547 if (cn_mute || c == '\0') 548 return; 549 STAILQ_FOREACH(cnd, &cn_devlist, cnd_next) { 550 cn = cnd->cnd_cn; 551 if (c == '\n') 552 cn->cn_putc(cn, '\r'); 553 cn->cn_putc(cn, c); 554 } 555 #ifdef DDB 556 if (console_pausing && !db_active && (c == '\n')) { 557 #else 558 if (console_pausing && (c == '\n')) { 559 #endif 560 for (cp = console_pausestr; *cp != '\0'; cp++) 561 cnputc(*cp); 562 if (cngetc() == '.') 563 console_pausing = 0; 564 cnputc('\r'); 565 for (cp = console_pausestr; *cp != '\0'; cp++) 566 cnputc(' '); 567 cnputc('\r'); 568 } 569 } 570 571 void 572 cndbctl(int on) 573 { 574 struct cn_device *cnd; 575 struct consdev *cn; 576 static int refcount; 577 578 if (!on) 579 refcount--; 580 if (refcount == 0) 581 STAILQ_FOREACH(cnd, &cn_devlist, cnd_next) { 582 cn = cnd->cnd_cn; 583 if (cn->cn_dbctl != NULL) 584 cn->cn_dbctl(cn, on); 585 } 586 if (on) 587 refcount++; 588 } 589 590 static void 591 cn_drvinit(void *unused) 592 { 593 594 make_dev(&cn_cdevsw, 0, UID_ROOT, GID_WHEEL, 0600, "console"); 595 } 596 597 SYSINIT(cndev, SI_SUB_DRIVERS, SI_ORDER_MIDDLE, cn_drvinit, NULL)
Cache object: b66589387bd3fe802f7fb7a3120071db
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