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
Version:
- FREEBSD - FREEBSD-13-STABLE - FREEBSD-13-0 - FREEBSD-12-STABLE - FREEBSD-12-0 - FREEBSD-11-STABLE - FREEBSD-11-0 - FREEBSD-10-STABLE - FREEBSD-10-0 - FREEBSD-9-STABLE - FREEBSD-9-0 - FREEBSD-8-STABLE - FREEBSD-8-0 - FREEBSD-7-STABLE - FREEBSD-7-0 - FREEBSD-6-STABLE - FREEBSD-6-0 - FREEBSD-5-STABLE - FREEBSD-5-0 - FREEBSD-4-STABLE - FREEBSD-3-STABLE - FREEBSD22 - l41 - OPENBSD - linux-2.6 - MK84 - PLAN9 - xnu-8792
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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 * $FreeBSD$ 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/kernel.h> 49 #include <sys/proc.h> 50 #include <sys/reboot.h> 51 #include <sys/sysctl.h> 52 #include <sys/tty.h> 53 #include <sys/uio.h> 54 55 #include <ddb/ddb.h> 56 57 #include <machine/cpu.h> 58 59 static d_open_t cnopen; 60 static d_close_t cnclose; 61 static d_read_t cnread; 62 static d_write_t cnwrite; 63 static d_ioctl_t cnioctl; 64 static d_poll_t cnpoll; 65 static d_kqfilter_t cnkqfilter; 66 67 #define CDEV_MAJOR 0 68 static struct cdevsw cn_cdevsw = { 69 /* open */ cnopen, 70 /* close */ cnclose, 71 /* read */ cnread, 72 /* write */ cnwrite, 73 /* ioctl */ cnioctl, 74 /* poll */ cnpoll, 75 /* mmap */ nommap, 76 /* strategy */ nostrategy, 77 /* name */ "console", 78 /* maj */ CDEV_MAJOR, 79 /* dump */ nodump, 80 /* psize */ nopsize, 81 /* flags */ D_TTY | D_KQFILTER, 82 /* bmaj */ -1, 83 /* kqfilter */ cnkqfilter, 84 }; 85 86 static dev_t cn_dev_t; /* seems to be never really used */ 87 static udev_t cn_udev_t; 88 SYSCTL_OPAQUE(_machdep, CPU_CONSDEV, consdev, CTLFLAG_RD, 89 &cn_udev_t, sizeof cn_udev_t, "T,dev_t", ""); 90 91 static int cn_mute; 92 93 int cons_unavail = 0; /* XXX: 94 * physical console not available for 95 * input (i.e., it is in graphics mode) 96 */ 97 98 static u_char cn_is_open; /* nonzero if logical console is open */ 99 static int openmode, openflag; /* how /dev/console was openned */ 100 static dev_t cn_devfsdev; /* represents the device private info */ 101 static u_char cn_phys_is_open; /* nonzero if physical device is open */ 102 static d_close_t *cn_phys_close; /* physical device close function */ 103 static d_open_t *cn_phys_open; /* physical device open function */ 104 struct consdev *cn_tab; /* physical console device info */ 105 static u_char console_pausing; /* pause after each line during probe */ 106 static char *console_pausestr= 107 "<pause; press any key to proceed to next line or '.' to end pause mode>"; 108 109 CONS_DRIVER(cons, NULL, NULL, NULL, NULL, NULL, NULL, NULL); 110 111 void 112 cninit() 113 { 114 struct consdev *best_cp, *cp, **list; 115 116 /* 117 * Find the first console with the highest priority. 118 */ 119 best_cp = NULL; 120 list = (struct consdev **)cons_set.ls_items; 121 while ((cp = *list++) != NULL) { 122 if (cp->cn_probe == NULL) 123 continue; 124 (*cp->cn_probe)(cp); 125 if (cp->cn_pri > CN_DEAD && 126 (best_cp == NULL || cp->cn_pri > best_cp->cn_pri)) 127 best_cp = cp; 128 } 129 130 /* 131 * Check if we should mute the console (for security reasons perhaps) 132 * It can be changes dynamically using sysctl kern.consmute 133 * once we are up and going. 134 * 135 */ 136 cn_mute = ((boothowto & (RB_MUTE 137 |RB_SINGLE 138 |RB_VERBOSE 139 |RB_ASKNAME 140 |RB_CONFIG)) == RB_MUTE); 141 142 /* 143 * If no console, give up. 144 */ 145 if (best_cp == NULL) { 146 if (cn_tab != NULL && cn_tab->cn_term != NULL) 147 (*cn_tab->cn_term)(cn_tab); 148 cn_tab = best_cp; 149 return; 150 } 151 152 /* 153 * Initialize console, then attach to it. This ordering allows 154 * debugging using the previous console, if any. 155 */ 156 (*best_cp->cn_init)(best_cp); 157 if (cn_tab != NULL && cn_tab != best_cp) { 158 /* Turn off the previous console. */ 159 if (cn_tab->cn_term != NULL) 160 (*cn_tab->cn_term)(cn_tab); 161 } 162 if (boothowto & RB_PAUSE) 163 console_pausing = 1; 164 cn_tab = best_cp; 165 } 166 167 void 168 cninit_finish() 169 { 170 struct cdevsw *cdp; 171 172 if ((cn_tab == NULL) || cn_mute) 173 return; 174 175 /* 176 * Hook the open and close functions. 177 */ 178 cdp = devsw(cn_tab->cn_dev); 179 if (cdp != NULL) { 180 cn_phys_close = cdp->d_close; 181 cdp->d_close = cnclose; 182 cn_phys_open = cdp->d_open; 183 cdp->d_open = cnopen; 184 } 185 cn_dev_t = cn_tab->cn_dev; 186 cn_udev_t = dev2udev(cn_dev_t); 187 console_pausing = 0; 188 } 189 190 static void 191 cnuninit(void) 192 { 193 struct cdevsw *cdp; 194 195 if (cn_tab == NULL) 196 return; 197 198 /* 199 * Unhook the open and close functions. 200 */ 201 cdp = devsw(cn_tab->cn_dev); 202 if (cdp != NULL) { 203 cdp->d_close = cn_phys_close; 204 cdp->d_open = cn_phys_open; 205 } 206 cn_phys_close = NULL; 207 cn_phys_open = NULL; 208 cn_dev_t = NODEV; 209 cn_udev_t = NOUDEV; 210 } 211 212 /* 213 * User has changed the state of the console muting. 214 * This may require us to open or close the device in question. 215 */ 216 static int 217 sysctl_kern_consmute(SYSCTL_HANDLER_ARGS) 218 { 219 int error; 220 int ocn_mute; 221 222 ocn_mute = cn_mute; 223 error = sysctl_handle_int(oidp, &cn_mute, 0, req); 224 if((error == 0) && (cn_tab != NULL) && (req->newptr != NULL)) { 225 if(ocn_mute && !cn_mute) { 226 /* 227 * going from muted to unmuted.. open the physical dev 228 * if the console has been openned 229 */ 230 cninit_finish(); 231 if(cn_is_open) 232 /* XXX curproc is not what we want really */ 233 error = cnopen(cn_dev_t, openflag, 234 openmode, curproc); 235 /* if it failed, back it out */ 236 if ( error != 0) cnuninit(); 237 } else if (!ocn_mute && cn_mute) { 238 /* 239 * going from unmuted to muted.. close the physical dev 240 * if it's only open via /dev/console 241 */ 242 if(cn_is_open) 243 error = cnclose(cn_dev_t, openflag, 244 openmode, curproc); 245 if ( error == 0) cnuninit(); 246 } 247 if (error != 0) { 248 /* 249 * back out the change if there was an error 250 */ 251 cn_mute = ocn_mute; 252 } 253 } 254 return (error); 255 } 256 257 SYSCTL_PROC(_kern, OID_AUTO, consmute, CTLTYPE_INT|CTLFLAG_RW, 258 0, sizeof cn_mute, sysctl_kern_consmute, "I", ""); 259 260 static int 261 cnopen(dev, flag, mode, p) 262 dev_t dev; 263 int flag, mode; 264 struct proc *p; 265 { 266 dev_t cndev, physdev; 267 int retval = 0; 268 269 if (cn_tab == NULL || cn_phys_open == NULL) 270 return (0); 271 cndev = cn_tab->cn_dev; 272 physdev = (major(dev) == major(cndev) ? dev : cndev); 273 /* 274 * If mute is active, then non console opens don't get here 275 * so we don't need to check for that. They 276 * bypass this and go straight to the device. 277 */ 278 if(!cn_mute) 279 retval = (*cn_phys_open)(physdev, flag, mode, p); 280 if (retval == 0) { 281 /* 282 * check if we openned it via /dev/console or 283 * via the physical entry (e.g. /dev/sio0). 284 */ 285 if (dev == cndev) 286 cn_phys_is_open = 1; 287 else if (physdev == cndev) { 288 openmode = mode; 289 openflag = flag; 290 cn_is_open = 1; 291 } 292 dev->si_tty = physdev->si_tty; 293 } 294 return (retval); 295 } 296 297 static int 298 cnclose(dev, flag, mode, p) 299 dev_t dev; 300 int flag, mode; 301 struct proc *p; 302 { 303 dev_t cndev; 304 struct tty *cn_tp; 305 306 if (cn_tab == NULL || cn_phys_open == NULL) 307 return (0); 308 cndev = cn_tab->cn_dev; 309 cn_tp = cndev->si_tty; 310 /* 311 * act appropriatly depending on whether it's /dev/console 312 * or the pysical device (e.g. /dev/sio) that's being closed. 313 * in either case, don't actually close the device unless 314 * both are closed. 315 */ 316 if (dev == cndev) { 317 /* the physical device is about to be closed */ 318 cn_phys_is_open = 0; 319 if (cn_is_open) { 320 if (cn_tp) { 321 /* perform a ttyhalfclose() */ 322 /* reset session and proc group */ 323 cn_tp->t_pgrp = NULL; 324 cn_tp->t_session = NULL; 325 } 326 return (0); 327 } 328 } else if (major(dev) != major(cndev)) { 329 /* the logical console is about to be closed */ 330 cn_is_open = 0; 331 if (cn_phys_is_open) 332 return (0); 333 dev = cndev; 334 } 335 if(cn_phys_close) 336 return ((*cn_phys_close)(dev, flag, mode, p)); 337 return (0); 338 } 339 340 static int 341 cnread(dev, uio, flag) 342 dev_t dev; 343 struct uio *uio; 344 int flag; 345 { 346 347 if (cn_tab == NULL || cn_phys_open == NULL) 348 return (0); 349 dev = cn_tab->cn_dev; 350 return ((*devsw(dev)->d_read)(dev, uio, flag)); 351 } 352 353 static int 354 cnwrite(dev, uio, flag) 355 dev_t dev; 356 struct uio *uio; 357 int flag; 358 { 359 360 if (cn_tab == NULL || cn_phys_open == NULL) { 361 uio->uio_resid = 0; /* dump the data */ 362 return (0); 363 } 364 if (constty) 365 dev = constty->t_dev; 366 else 367 dev = cn_tab->cn_dev; 368 log_console(uio); 369 return ((*devsw(dev)->d_write)(dev, uio, flag)); 370 } 371 372 static int 373 cnioctl(dev, cmd, data, flag, p) 374 dev_t dev; 375 u_long cmd; 376 caddr_t data; 377 int flag; 378 struct proc *p; 379 { 380 int error; 381 382 if (cn_tab == NULL || cn_phys_open == NULL) 383 return (0); 384 /* 385 * Superuser can always use this to wrest control of console 386 * output from the "virtual" console. 387 */ 388 if (cmd == TIOCCONS && constty) { 389 error = suser(p); 390 if (error) 391 return (error); 392 constty = NULL; 393 return (0); 394 } 395 dev = cn_tab->cn_dev; 396 return ((*devsw(dev)->d_ioctl)(dev, cmd, data, flag, p)); 397 } 398 399 static int 400 cnpoll(dev, events, p) 401 dev_t dev; 402 int events; 403 struct proc *p; 404 { 405 if ((cn_tab == NULL) || cn_mute) 406 return (1); 407 408 dev = cn_tab->cn_dev; 409 410 return ((*devsw(dev)->d_poll)(dev, events, p)); 411 } 412 413 static int 414 cnkqfilter(dev, kn) 415 dev_t dev; 416 struct knote *kn; 417 { 418 if ((cn_tab == NULL) || cn_mute) 419 return (1); 420 421 dev = cn_tab->cn_dev; 422 if (devsw(dev)->d_flags & D_KQFILTER) 423 return ((*devsw(dev)->d_kqfilter)(dev, kn)); 424 return (1); 425 } 426 427 int 428 cngetc() 429 { 430 int c; 431 if ((cn_tab == NULL) || cn_mute) 432 return (-1); 433 c = (*cn_tab->cn_getc)(cn_tab->cn_dev); 434 if (c == '\r') c = '\n'; /* console input is always ICRNL */ 435 return (c); 436 } 437 438 int 439 cncheckc() 440 { 441 if ((cn_tab == NULL) || cn_mute) 442 return (-1); 443 return ((*cn_tab->cn_checkc)(cn_tab->cn_dev)); 444 } 445 446 void 447 cnputc(c) 448 register int c; 449 { 450 char *cp; 451 452 if ((cn_tab == NULL) || cn_mute) 453 return; 454 if (c) { 455 if (c == '\n') 456 (*cn_tab->cn_putc)(cn_tab->cn_dev, '\r'); 457 (*cn_tab->cn_putc)(cn_tab->cn_dev, c); 458 #ifdef DDB 459 if (console_pausing && !db_active && (c == '\n')) { 460 #else 461 if (console_pausing && (c == '\n')) { 462 #endif 463 for(cp=console_pausestr; *cp != '\0'; cp++) 464 (*cn_tab->cn_putc)(cn_tab->cn_dev, *cp); 465 if (cngetc() == '.') 466 console_pausing = 0; 467 (*cn_tab->cn_putc)(cn_tab->cn_dev, '\r'); 468 for(cp=console_pausestr; *cp != '\0'; cp++) 469 (*cn_tab->cn_putc)(cn_tab->cn_dev, ' '); 470 (*cn_tab->cn_putc)(cn_tab->cn_dev, '\r'); 471 } 472 } 473 } 474 475 void 476 cndbctl(on) 477 int on; 478 { 479 static int refcount; 480 481 if (cn_tab == NULL) 482 return; 483 if (!on) 484 refcount--; 485 if (refcount == 0 && cn_tab->cn_dbctl != NULL) 486 (*cn_tab->cn_dbctl)(cn_tab->cn_dev, on); 487 if (on) 488 refcount++; 489 } 490 491 static void 492 cn_drvinit(void *unused) 493 { 494 495 cn_devfsdev = make_dev(&cn_cdevsw, 0, UID_ROOT, GID_WHEEL, 0600, 496 "console"); 497 } 498 499 SYSINIT(cndev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR,cn_drvinit,NULL)
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