| 1 | /* |
| 2 | * Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds |
| 3 | * |
| 4 | * Modified by Fred N. van Kempen, 01/29/93, to add line disciplines |
| 5 | * which can be dynamically activated and de-activated by the line |
| 6 | * discipline handling modules (like SLIP). |
| 7 | */ |
| 8 | |
| 9 | #include <linux/types.h> |
| 10 | #include <linux/termios.h> |
| 11 | #include <linux/errno.h> |
| 12 | #include <linux/sched.h> |
| 13 | #include <linux/kernel.h> |
| 14 | #include <linux/major.h> |
| 15 | #include <linux/tty.h> |
| 16 | #include <linux/fcntl.h> |
| 17 | #include <linux/string.h> |
| 18 | #include <linux/mm.h> |
| 19 | #include <linux/module.h> |
| 20 | #include <linux/bitops.h> |
| 21 | #include <linux/mutex.h> |
| 22 | |
| 23 | #include <asm/io.h> |
| 24 | #include <asm/uaccess.h> |
| 25 | #include <asm/system.h> |
| 26 | |
| 27 | #undef TTY_DEBUG_WAIT_UNTIL_SENT |
| 28 | |
| 29 | #undef DEBUG |
| 30 | |
| 31 | /* |
| 32 | * Internal flag options for termios setting behavior |
| 33 | */ |
| 34 | #define TERMIOS_FLUSH 1 |
| 35 | #define TERMIOS_WAIT 2 |
| 36 | #define TERMIOS_TERMIO 4 |
| 37 | #define TERMIOS_OLD 8 |
| 38 | |
| 39 | |
| 40 | /** |
| 41 | * tty_chars_in_buffer - characters pending |
| 42 | * @tty: terminal |
| 43 | * |
| 44 | * Return the number of bytes of data in the device private |
| 45 | * output queue. If no private method is supplied there is assumed |
| 46 | * to be no queue on the device. |
| 47 | */ |
| 48 | |
| 49 | int tty_chars_in_buffer(struct tty_struct *tty) |
| 50 | { |
| 51 | if (tty->ops->chars_in_buffer) |
| 52 | return tty->ops->chars_in_buffer(tty); |
| 53 | else |
| 54 | return 0; |
| 55 | } |
| 56 | EXPORT_SYMBOL(tty_chars_in_buffer); |
| 57 | |
| 58 | /** |
| 59 | * tty_write_room - write queue space |
| 60 | * @tty: terminal |
| 61 | * |
| 62 | * Return the number of bytes that can be queued to this device |
| 63 | * at the present time. The result should be treated as a guarantee |
| 64 | * and the driver cannot offer a value it later shrinks by more than |
| 65 | * the number of bytes written. If no method is provided 2K is always |
| 66 | * returned and data may be lost as there will be no flow control. |
| 67 | */ |
| 68 | |
| 69 | int tty_write_room(struct tty_struct *tty) |
| 70 | { |
| 71 | if (tty->ops->write_room) |
| 72 | return tty->ops->write_room(tty); |
| 73 | return 2048; |
| 74 | } |
| 75 | EXPORT_SYMBOL(tty_write_room); |
| 76 | |
| 77 | /** |
| 78 | * tty_driver_flush_buffer - discard internal buffer |
| 79 | * @tty: terminal |
| 80 | * |
| 81 | * Discard the internal output buffer for this device. If no method |
| 82 | * is provided then either the buffer cannot be hardware flushed or |
| 83 | * there is no buffer driver side. |
| 84 | */ |
| 85 | void tty_driver_flush_buffer(struct tty_struct *tty) |
| 86 | { |
| 87 | if (tty->ops->flush_buffer) |
| 88 | tty->ops->flush_buffer(tty); |
| 89 | } |
| 90 | EXPORT_SYMBOL(tty_driver_flush_buffer); |
| 91 | |
| 92 | /** |
| 93 | * tty_throttle - flow control |
| 94 | * @tty: terminal |
| 95 | * |
| 96 | * Indicate that a tty should stop transmitting data down the stack. |
| 97 | * Takes the termios mutex to protect against parallel throttle/unthrottle |
| 98 | * and also to ensure the driver can consistently reference its own |
| 99 | * termios data at this point when implementing software flow control. |
| 100 | */ |
| 101 | |
| 102 | void tty_throttle(struct tty_struct *tty) |
| 103 | { |
| 104 | mutex_lock(&tty->termios_mutex); |
| 105 | /* check TTY_THROTTLED first so it indicates our state */ |
| 106 | if (!test_and_set_bit(TTY_THROTTLED, &tty->flags) && |
| 107 | tty->ops->throttle) |
| 108 | tty->ops->throttle(tty); |
| 109 | mutex_unlock(&tty->termios_mutex); |
| 110 | } |
| 111 | EXPORT_SYMBOL(tty_throttle); |
| 112 | |
| 113 | /** |
| 114 | * tty_unthrottle - flow control |
| 115 | * @tty: terminal |
| 116 | * |
| 117 | * Indicate that a tty may continue transmitting data down the stack. |
| 118 | * Takes the termios mutex to protect against parallel throttle/unthrottle |
| 119 | * and also to ensure the driver can consistently reference its own |
| 120 | * termios data at this point when implementing software flow control. |
| 121 | * |
| 122 | * Drivers should however remember that the stack can issue a throttle, |
| 123 | * then change flow control method, then unthrottle. |
| 124 | */ |
| 125 | |
| 126 | void tty_unthrottle(struct tty_struct *tty) |
| 127 | { |
| 128 | mutex_lock(&tty->termios_mutex); |
| 129 | if (test_and_clear_bit(TTY_THROTTLED, &tty->flags) && |
| 130 | tty->ops->unthrottle) |
| 131 | tty->ops->unthrottle(tty); |
| 132 | mutex_unlock(&tty->termios_mutex); |
| 133 | } |
| 134 | EXPORT_SYMBOL(tty_unthrottle); |
| 135 | |
| 136 | /** |
| 137 | * tty_wait_until_sent - wait for I/O to finish |
| 138 | * @tty: tty we are waiting for |
| 139 | * @timeout: how long we will wait |
| 140 | * |
| 141 | * Wait for characters pending in a tty driver to hit the wire, or |
| 142 | * for a timeout to occur (eg due to flow control) |
| 143 | * |
| 144 | * Locking: none |
| 145 | */ |
| 146 | |
| 147 | void tty_wait_until_sent(struct tty_struct *tty, long timeout) |
| 148 | { |
| 149 | #ifdef TTY_DEBUG_WAIT_UNTIL_SENT |
| 150 | char buf[64]; |
| 151 | |
| 152 | printk(KERN_DEBUG "%s wait until sent...\n", tty_name(tty, buf)); |
| 153 | #endif |
| 154 | if (!timeout) |
| 155 | timeout = MAX_SCHEDULE_TIMEOUT; |
| 156 | if (wait_event_interruptible_timeout(tty->write_wait, |
| 157 | !tty_chars_in_buffer(tty), timeout) >= 0) { |
| 158 | if (tty->ops->wait_until_sent) |
| 159 | tty->ops->wait_until_sent(tty, timeout); |
| 160 | } |
| 161 | } |
| 162 | EXPORT_SYMBOL(tty_wait_until_sent); |
| 163 | |
| 164 | |
| 165 | /* |
| 166 | * Termios Helper Methods |
| 167 | */ |
| 168 | |
| 169 | static void unset_locked_termios(struct ktermios *termios, |
| 170 | struct ktermios *old, |
| 171 | struct ktermios *locked) |
| 172 | { |
| 173 | int i; |
| 174 | |
| 175 | #define NOSET_MASK(x, y, z) (x = ((x) & ~(z)) | ((y) & (z))) |
| 176 | |
| 177 | if (!locked) { |
| 178 | printk(KERN_WARNING "Warning?!? termios_locked is NULL.\n"); |
| 179 | return; |
| 180 | } |
| 181 | |
| 182 | NOSET_MASK(termios->c_iflag, old->c_iflag, locked->c_iflag); |
| 183 | NOSET_MASK(termios->c_oflag, old->c_oflag, locked->c_oflag); |
| 184 | NOSET_MASK(termios->c_cflag, old->c_cflag, locked->c_cflag); |
| 185 | NOSET_MASK(termios->c_lflag, old->c_lflag, locked->c_lflag); |
| 186 | termios->c_line = locked->c_line ? old->c_line : termios->c_line; |
| 187 | for (i = 0; i < NCCS; i++) |
| 188 | termios->c_cc[i] = locked->c_cc[i] ? |
| 189 | old->c_cc[i] : termios->c_cc[i]; |
| 190 | /* FIXME: What should we do for i/ospeed */ |
| 191 | } |
| 192 | |
| 193 | /* |
| 194 | * Routine which returns the baud rate of the tty |
| 195 | * |
| 196 | * Note that the baud_table needs to be kept in sync with the |
| 197 | * include/asm/termbits.h file. |
| 198 | */ |
| 199 | static const speed_t baud_table[] = { |
| 200 | 0, 50, 75, 110, 134, 150, 200, 300, 600, 1200, 1800, 2400, 4800, |
| 201 | 9600, 19200, 38400, 57600, 115200, 230400, 460800, |
| 202 | #ifdef __sparc__ |
| 203 | 76800, 153600, 307200, 614400, 921600 |
| 204 | #else |
| 205 | 500000, 576000, 921600, 1000000, 1152000, 1500000, 2000000, |
| 206 | 2500000, 3000000, 3500000, 4000000 |
| 207 | #endif |
| 208 | }; |
| 209 | |
| 210 | #ifndef __sparc__ |
| 211 | static const tcflag_t baud_bits[] = { |
| 212 | B0, B50, B75, B110, B134, B150, B200, B300, B600, |
| 213 | B1200, B1800, B2400, B4800, B9600, B19200, B38400, |
| 214 | B57600, B115200, B230400, B460800, B500000, B576000, |
| 215 | B921600, B1000000, B1152000, B1500000, B2000000, B2500000, |
| 216 | B3000000, B3500000, B4000000 |
| 217 | }; |
| 218 | #else |
| 219 | static const tcflag_t baud_bits[] = { |
| 220 | B0, B50, B75, B110, B134, B150, B200, B300, B600, |
| 221 | B1200, B1800, B2400, B4800, B9600, B19200, B38400, |
| 222 | B57600, B115200, B230400, B460800, B76800, B153600, |
| 223 | B307200, B614400, B921600 |
| 224 | }; |
| 225 | #endif |
| 226 | |
| 227 | static int n_baud_table = ARRAY_SIZE(baud_table); |
| 228 | |
| 229 | /** |
| 230 | * tty_termios_baud_rate |
| 231 | * @termios: termios structure |
| 232 | * |
| 233 | * Convert termios baud rate data into a speed. This should be called |
| 234 | * with the termios lock held if this termios is a terminal termios |
| 235 | * structure. May change the termios data. Device drivers can call this |
| 236 | * function but should use ->c_[io]speed directly as they are updated. |
| 237 | * |
| 238 | * Locking: none |
| 239 | */ |
| 240 | |
| 241 | speed_t tty_termios_baud_rate(struct ktermios *termios) |
| 242 | { |
| 243 | unsigned int cbaud; |
| 244 | |
| 245 | cbaud = termios->c_cflag & CBAUD; |
| 246 | |
| 247 | #ifdef BOTHER |
| 248 | /* Magic token for arbitrary speed via c_ispeed/c_ospeed */ |
| 249 | if (cbaud == BOTHER) |
| 250 | return termios->c_ospeed; |
| 251 | #endif |
| 252 | if (cbaud & CBAUDEX) { |
| 253 | cbaud &= ~CBAUDEX; |
| 254 | |
| 255 | if (cbaud < 1 || cbaud + 15 > n_baud_table) |
| 256 | termios->c_cflag &= ~CBAUDEX; |
| 257 | else |
| 258 | cbaud += 15; |
| 259 | } |
| 260 | return baud_table[cbaud]; |
| 261 | } |
| 262 | EXPORT_SYMBOL(tty_termios_baud_rate); |
| 263 | |
| 264 | /** |
| 265 | * tty_termios_input_baud_rate |
| 266 | * @termios: termios structure |
| 267 | * |
| 268 | * Convert termios baud rate data into a speed. This should be called |
| 269 | * with the termios lock held if this termios is a terminal termios |
| 270 | * structure. May change the termios data. Device drivers can call this |
| 271 | * function but should use ->c_[io]speed directly as they are updated. |
| 272 | * |
| 273 | * Locking: none |
| 274 | */ |
| 275 | |
| 276 | speed_t tty_termios_input_baud_rate(struct ktermios *termios) |
| 277 | { |
| 278 | #ifdef IBSHIFT |
| 279 | unsigned int cbaud = (termios->c_cflag >> IBSHIFT) & CBAUD; |
| 280 | |
| 281 | if (cbaud == B0) |
| 282 | return tty_termios_baud_rate(termios); |
| 283 | |
| 284 | /* Magic token for arbitrary speed via c_ispeed*/ |
| 285 | if (cbaud == BOTHER) |
| 286 | return termios->c_ispeed; |
| 287 | |
| 288 | if (cbaud & CBAUDEX) { |
| 289 | cbaud &= ~CBAUDEX; |
| 290 | |
| 291 | if (cbaud < 1 || cbaud + 15 > n_baud_table) |
| 292 | termios->c_cflag &= ~(CBAUDEX << IBSHIFT); |
| 293 | else |
| 294 | cbaud += 15; |
| 295 | } |
| 296 | return baud_table[cbaud]; |
| 297 | #else |
| 298 | return tty_termios_baud_rate(termios); |
| 299 | #endif |
| 300 | } |
| 301 | EXPORT_SYMBOL(tty_termios_input_baud_rate); |
| 302 | |
| 303 | /** |
| 304 | * tty_termios_encode_baud_rate |
| 305 | * @termios: ktermios structure holding user requested state |
| 306 | * @ispeed: input speed |
| 307 | * @ospeed: output speed |
| 308 | * |
| 309 | * Encode the speeds set into the passed termios structure. This is |
| 310 | * used as a library helper for drivers so that they can report back |
| 311 | * the actual speed selected when it differs from the speed requested |
| 312 | * |
| 313 | * For maximal back compatibility with legacy SYS5/POSIX *nix behaviour |
| 314 | * we need to carefully set the bits when the user does not get the |
| 315 | * desired speed. We allow small margins and preserve as much of possible |
| 316 | * of the input intent to keep compatibility. |
| 317 | * |
| 318 | * Locking: Caller should hold termios lock. This is already held |
| 319 | * when calling this function from the driver termios handler. |
| 320 | * |
| 321 | * The ifdefs deal with platforms whose owners have yet to update them |
| 322 | * and will all go away once this is done. |
| 323 | */ |
| 324 | |
| 325 | void tty_termios_encode_baud_rate(struct ktermios *termios, |
| 326 | speed_t ibaud, speed_t obaud) |
| 327 | { |
| 328 | int i = 0; |
| 329 | int ifound = -1, ofound = -1; |
| 330 | int iclose = ibaud/50, oclose = obaud/50; |
| 331 | int ibinput = 0; |
| 332 | |
| 333 | if (obaud == 0) /* CD dropped */ |
| 334 | ibaud = 0; /* Clear ibaud to be sure */ |
| 335 | |
| 336 | termios->c_ispeed = ibaud; |
| 337 | termios->c_ospeed = obaud; |
| 338 | |
| 339 | #ifdef BOTHER |
| 340 | /* If the user asked for a precise weird speed give a precise weird |
| 341 | answer. If they asked for a Bfoo speed they many have problems |
| 342 | digesting non-exact replies so fuzz a bit */ |
| 343 | |
| 344 | if ((termios->c_cflag & CBAUD) == BOTHER) |
| 345 | oclose = 0; |
| 346 | if (((termios->c_cflag >> IBSHIFT) & CBAUD) == BOTHER) |
| 347 | iclose = 0; |
| 348 | if ((termios->c_cflag >> IBSHIFT) & CBAUD) |
| 349 | ibinput = 1; /* An input speed was specified */ |
| 350 | #endif |
| 351 | termios->c_cflag &= ~CBAUD; |
| 352 | |
| 353 | /* |
| 354 | * Our goal is to find a close match to the standard baud rate |
| 355 | * returned. Walk the baud rate table and if we get a very close |
| 356 | * match then report back the speed as a POSIX Bxxxx value by |
| 357 | * preference |
| 358 | */ |
| 359 | |
| 360 | do { |
| 361 | if (obaud - oclose <= baud_table[i] && |
| 362 | obaud + oclose >= baud_table[i]) { |
| 363 | termios->c_cflag |= baud_bits[i]; |
| 364 | ofound = i; |
| 365 | } |
| 366 | if (ibaud - iclose <= baud_table[i] && |
| 367 | ibaud + iclose >= baud_table[i]) { |
| 368 | /* For the case input == output don't set IBAUD bits |
| 369 | if the user didn't do so */ |
| 370 | if (ofound == i && !ibinput) |
| 371 | ifound = i; |
| 372 | #ifdef IBSHIFT |
| 373 | else { |
| 374 | ifound = i; |
| 375 | termios->c_cflag |= (baud_bits[i] << IBSHIFT); |
| 376 | } |
| 377 | #endif |
| 378 | } |
| 379 | } while (++i < n_baud_table); |
| 380 | |
| 381 | /* |
| 382 | * If we found no match then use BOTHER if provided or warn |
| 383 | * the user their platform maintainer needs to wake up if not. |
| 384 | */ |
| 385 | #ifdef BOTHER |
| 386 | if (ofound == -1) |
| 387 | termios->c_cflag |= BOTHER; |
| 388 | /* Set exact input bits only if the input and output differ or the |
| 389 | user already did */ |
| 390 | if (ifound == -1 && (ibaud != obaud || ibinput)) |
| 391 | termios->c_cflag |= (BOTHER << IBSHIFT); |
| 392 | #else |
| 393 | if (ifound == -1 || ofound == -1) { |
| 394 | printk_once(KERN_WARNING "tty: Unable to return correct " |
| 395 | "speed data as your architecture needs updating.\n"); |
| 396 | } |
| 397 | #endif |
| 398 | } |
| 399 | EXPORT_SYMBOL_GPL(tty_termios_encode_baud_rate); |
| 400 | |
| 401 | /** |
| 402 | * tty_encode_baud_rate - set baud rate of the tty |
| 403 | * @ibaud: input baud rate |
| 404 | * @obad: output baud rate |
| 405 | * |
| 406 | * Update the current termios data for the tty with the new speed |
| 407 | * settings. The caller must hold the termios_mutex for the tty in |
| 408 | * question. |
| 409 | */ |
| 410 | |
| 411 | void tty_encode_baud_rate(struct tty_struct *tty, speed_t ibaud, speed_t obaud) |
| 412 | { |
| 413 | tty_termios_encode_baud_rate(tty->termios, ibaud, obaud); |
| 414 | } |
| 415 | EXPORT_SYMBOL_GPL(tty_encode_baud_rate); |
| 416 | |
| 417 | /** |
| 418 | * tty_get_baud_rate - get tty bit rates |
| 419 | * @tty: tty to query |
| 420 | * |
| 421 | * Returns the baud rate as an integer for this terminal. The |
| 422 | * termios lock must be held by the caller and the terminal bit |
| 423 | * flags may be updated. |
| 424 | * |
| 425 | * Locking: none |
| 426 | */ |
| 427 | |
| 428 | speed_t tty_get_baud_rate(struct tty_struct *tty) |
| 429 | { |
| 430 | speed_t baud = tty_termios_baud_rate(tty->termios); |
| 431 | |
| 432 | if (baud == 38400 && tty->alt_speed) { |
| 433 | if (!tty->warned) { |
| 434 | printk(KERN_WARNING "Use of setserial/setrocket to " |
| 435 | "set SPD_* flags is deprecated\n"); |
| 436 | tty->warned = 1; |
| 437 | } |
| 438 | baud = tty->alt_speed; |
| 439 | } |
| 440 | |
| 441 | return baud; |
| 442 | } |
| 443 | EXPORT_SYMBOL(tty_get_baud_rate); |
| 444 | |
| 445 | /** |
| 446 | * tty_termios_copy_hw - copy hardware settings |
| 447 | * @new: New termios |
| 448 | * @old: Old termios |
| 449 | * |
| 450 | * Propagate the hardware specific terminal setting bits from |
| 451 | * the old termios structure to the new one. This is used in cases |
| 452 | * where the hardware does not support reconfiguration or as a helper |
| 453 | * in some cases where only minimal reconfiguration is supported |
| 454 | */ |
| 455 | |
| 456 | void tty_termios_copy_hw(struct ktermios *new, struct ktermios *old) |
| 457 | { |
| 458 | /* The bits a dumb device handles in software. Smart devices need |
| 459 | to always provide a set_termios method */ |
| 460 | new->c_cflag &= HUPCL | CREAD | CLOCAL; |
| 461 | new->c_cflag |= old->c_cflag & ~(HUPCL | CREAD | CLOCAL); |
| 462 | new->c_ispeed = old->c_ispeed; |
| 463 | new->c_ospeed = old->c_ospeed; |
| 464 | } |
| 465 | EXPORT_SYMBOL(tty_termios_copy_hw); |
| 466 | |
| 467 | /** |
| 468 | * tty_termios_hw_change - check for setting change |
| 469 | * @a: termios |
| 470 | * @b: termios to compare |
| 471 | * |
| 472 | * Check if any of the bits that affect a dumb device have changed |
| 473 | * between the two termios structures, or a speed change is needed. |
| 474 | */ |
| 475 | |
| 476 | int tty_termios_hw_change(struct ktermios *a, struct ktermios *b) |
| 477 | { |
| 478 | if (a->c_ispeed != b->c_ispeed || a->c_ospeed != b->c_ospeed) |
| 479 | return 1; |
| 480 | if ((a->c_cflag ^ b->c_cflag) & ~(HUPCL | CREAD | CLOCAL)) |
| 481 | return 1; |
| 482 | return 0; |
| 483 | } |
| 484 | EXPORT_SYMBOL(tty_termios_hw_change); |
| 485 | |
| 486 | /** |
| 487 | * tty_set_termios - update termios values |
| 488 | * @tty: tty to update |
| 489 | * @new_termios: desired new value |
| 490 | * |
| 491 | * Perform updates to the termios values set on this terminal. There |
| 492 | * is a bit of layering violation here with n_tty in terms of the |
| 493 | * internal knowledge of this function. |
| 494 | * |
| 495 | * Locking: termios_mutex |
| 496 | */ |
| 497 | |
| 498 | int tty_set_termios(struct tty_struct *tty, struct ktermios *new_termios) |
| 499 | { |
| 500 | struct ktermios old_termios; |
| 501 | struct tty_ldisc *ld; |
| 502 | unsigned long flags; |
| 503 | |
| 504 | /* |
| 505 | * Perform the actual termios internal changes under lock. |
| 506 | */ |
| 507 | |
| 508 | |
| 509 | /* FIXME: we need to decide on some locking/ordering semantics |
| 510 | for the set_termios notification eventually */ |
| 511 | mutex_lock(&tty->termios_mutex); |
| 512 | old_termios = *tty->termios; |
| 513 | *tty->termios = *new_termios; |
| 514 | unset_locked_termios(tty->termios, &old_termios, tty->termios_locked); |
| 515 | |
| 516 | /* See if packet mode change of state. */ |
| 517 | if (tty->link && tty->link->packet) { |
| 518 | int extproc = (old_termios.c_lflag & EXTPROC) | |
| 519 | (tty->termios->c_lflag & EXTPROC); |
| 520 | int old_flow = ((old_termios.c_iflag & IXON) && |
| 521 | (old_termios.c_cc[VSTOP] == '\023') && |
| 522 | (old_termios.c_cc[VSTART] == '\021')); |
| 523 | int new_flow = (I_IXON(tty) && |
| 524 | STOP_CHAR(tty) == '\023' && |
| 525 | START_CHAR(tty) == '\021'); |
| 526 | if ((old_flow != new_flow) || extproc) { |
| 527 | spin_lock_irqsave(&tty->ctrl_lock, flags); |
| 528 | if (old_flow != new_flow) { |
| 529 | tty->ctrl_status &= ~(TIOCPKT_DOSTOP | TIOCPKT_NOSTOP); |
| 530 | if (new_flow) |
| 531 | tty->ctrl_status |= TIOCPKT_DOSTOP; |
| 532 | else |
| 533 | tty->ctrl_status |= TIOCPKT_NOSTOP; |
| 534 | } |
| 535 | if (extproc) |
| 536 | tty->ctrl_status |= TIOCPKT_IOCTL; |
| 537 | spin_unlock_irqrestore(&tty->ctrl_lock, flags); |
| 538 | wake_up_interruptible(&tty->link->read_wait); |
| 539 | } |
| 540 | } |
| 541 | |
| 542 | if (tty->ops->set_termios) |
| 543 | (*tty->ops->set_termios)(tty, &old_termios); |
| 544 | else |
| 545 | tty_termios_copy_hw(tty->termios, &old_termios); |
| 546 | |
| 547 | ld = tty_ldisc_ref(tty); |
| 548 | if (ld != NULL) { |
| 549 | if (ld->ops->set_termios) |
| 550 | (ld->ops->set_termios)(tty, &old_termios); |
| 551 | tty_ldisc_deref(ld); |
| 552 | } |
| 553 | mutex_unlock(&tty->termios_mutex); |
| 554 | return 0; |
| 555 | } |
| 556 | EXPORT_SYMBOL_GPL(tty_set_termios); |
| 557 | |
| 558 | /** |
| 559 | * set_termios - set termios values for a tty |
| 560 | * @tty: terminal device |
| 561 | * @arg: user data |
| 562 | * @opt: option information |
| 563 | * |
| 564 | * Helper function to prepare termios data and run necessary other |
| 565 | * functions before using tty_set_termios to do the actual changes. |
| 566 | * |
| 567 | * Locking: |
| 568 | * Called functions take ldisc and termios_mutex locks |
| 569 | */ |
| 570 | |
| 571 | static int set_termios(struct tty_struct *tty, void __user *arg, int opt) |
| 572 | { |
| 573 | struct ktermios tmp_termios; |
| 574 | struct tty_ldisc *ld; |
| 575 | int retval = tty_check_change(tty); |
| 576 | |
| 577 | if (retval) |
| 578 | return retval; |
| 579 | |
| 580 | mutex_lock(&tty->termios_mutex); |
| 581 | memcpy(&tmp_termios, tty->termios, sizeof(struct ktermios)); |
| 582 | mutex_unlock(&tty->termios_mutex); |
| 583 | |
| 584 | if (opt & TERMIOS_TERMIO) { |
| 585 | if (user_termio_to_kernel_termios(&tmp_termios, |
| 586 | (struct termio __user *)arg)) |
| 587 | return -EFAULT; |
| 588 | #ifdef TCGETS2 |
| 589 | } else if (opt & TERMIOS_OLD) { |
| 590 | if (user_termios_to_kernel_termios_1(&tmp_termios, |
| 591 | (struct termios __user *)arg)) |
| 592 | return -EFAULT; |
| 593 | } else { |
| 594 | if (user_termios_to_kernel_termios(&tmp_termios, |
| 595 | (struct termios2 __user *)arg)) |
| 596 | return -EFAULT; |
| 597 | } |
| 598 | #else |
| 599 | } else if (user_termios_to_kernel_termios(&tmp_termios, |
| 600 | (struct termios __user *)arg)) |
| 601 | return -EFAULT; |
| 602 | #endif |
| 603 | |
| 604 | /* If old style Bfoo values are used then load c_ispeed/c_ospeed |
| 605 | * with the real speed so its unconditionally usable */ |
| 606 | tmp_termios.c_ispeed = tty_termios_input_baud_rate(&tmp_termios); |
| 607 | tmp_termios.c_ospeed = tty_termios_baud_rate(&tmp_termios); |
| 608 | |
| 609 | ld = tty_ldisc_ref(tty); |
| 610 | |
| 611 | if (ld != NULL) { |
| 612 | if ((opt & TERMIOS_FLUSH) && ld->ops->flush_buffer) |
| 613 | ld->ops->flush_buffer(tty); |
| 614 | tty_ldisc_deref(ld); |
| 615 | } |
| 616 | |
| 617 | if (opt & TERMIOS_WAIT) { |
| 618 | tty_wait_until_sent(tty, 0); |
| 619 | if (signal_pending(current)) |
| 620 | return -EINTR; |
| 621 | } |
| 622 | |
| 623 | tty_set_termios(tty, &tmp_termios); |
| 624 | |
| 625 | /* FIXME: Arguably if tmp_termios == tty->termios AND the |
| 626 | actual requested termios was not tmp_termios then we may |
| 627 | want to return an error as no user requested change has |
| 628 | succeeded */ |
| 629 | return 0; |
| 630 | } |
| 631 | |
| 632 | static void copy_termios(struct tty_struct *tty, struct ktermios *kterm) |
| 633 | { |
| 634 | mutex_lock(&tty->termios_mutex); |
| 635 | memcpy(kterm, tty->termios, sizeof(struct ktermios)); |
| 636 | mutex_unlock(&tty->termios_mutex); |
| 637 | } |
| 638 | |
| 639 | static void copy_termios_locked(struct tty_struct *tty, struct ktermios *kterm) |
| 640 | { |
| 641 | mutex_lock(&tty->termios_mutex); |
| 642 | memcpy(kterm, tty->termios_locked, sizeof(struct ktermios)); |
| 643 | mutex_unlock(&tty->termios_mutex); |
| 644 | } |
| 645 | |
| 646 | static int get_termio(struct tty_struct *tty, struct termio __user *termio) |
| 647 | { |
| 648 | struct ktermios kterm; |
| 649 | copy_termios(tty, &kterm); |
| 650 | if (kernel_termios_to_user_termio(termio, &kterm)) |
| 651 | return -EFAULT; |
| 652 | return 0; |
| 653 | } |
| 654 | |
| 655 | |
| 656 | #ifdef TCGETX |
| 657 | |
| 658 | /** |
| 659 | * set_termiox - set termiox fields if possible |
| 660 | * @tty: terminal |
| 661 | * @arg: termiox structure from user |
| 662 | * @opt: option flags for ioctl type |
| 663 | * |
| 664 | * Implement the device calling points for the SYS5 termiox ioctl |
| 665 | * interface in Linux |
| 666 | */ |
| 667 | |
| 668 | static int set_termiox(struct tty_struct *tty, void __user *arg, int opt) |
| 669 | { |
| 670 | struct termiox tnew; |
| 671 | struct tty_ldisc *ld; |
| 672 | |
| 673 | if (tty->termiox == NULL) |
| 674 | return -EINVAL; |
| 675 | if (copy_from_user(&tnew, arg, sizeof(struct termiox))) |
| 676 | return -EFAULT; |
| 677 | |
| 678 | ld = tty_ldisc_ref(tty); |
| 679 | if (ld != NULL) { |
| 680 | if ((opt & TERMIOS_FLUSH) && ld->ops->flush_buffer) |
| 681 | ld->ops->flush_buffer(tty); |
| 682 | tty_ldisc_deref(ld); |
| 683 | } |
| 684 | if (opt & TERMIOS_WAIT) { |
| 685 | tty_wait_until_sent(tty, 0); |
| 686 | if (signal_pending(current)) |
| 687 | return -EINTR; |
| 688 | } |
| 689 | |
| 690 | mutex_lock(&tty->termios_mutex); |
| 691 | if (tty->ops->set_termiox) |
| 692 | tty->ops->set_termiox(tty, &tnew); |
| 693 | mutex_unlock(&tty->termios_mutex); |
| 694 | return 0; |
| 695 | } |
| 696 | |
| 697 | #endif |
| 698 | |
| 699 | |
| 700 | #ifdef TIOCGETP |
| 701 | /* |
| 702 | * These are deprecated, but there is limited support.. |
| 703 | * |
| 704 | * The "sg_flags" translation is a joke.. |
| 705 | */ |
| 706 | static int get_sgflags(struct tty_struct *tty) |
| 707 | { |
| 708 | int flags = 0; |
| 709 | |
| 710 | if (!(tty->termios->c_lflag & ICANON)) { |
| 711 | if (tty->termios->c_lflag & ISIG) |
| 712 | flags |= 0x02; /* cbreak */ |
| 713 | else |
| 714 | flags |= 0x20; /* raw */ |
| 715 | } |
| 716 | if (tty->termios->c_lflag & ECHO) |
| 717 | flags |= 0x08; /* echo */ |
| 718 | if (tty->termios->c_oflag & OPOST) |
| 719 | if (tty->termios->c_oflag & ONLCR) |
| 720 | flags |= 0x10; /* crmod */ |
| 721 | return flags; |
| 722 | } |
| 723 | |
| 724 | static int get_sgttyb(struct tty_struct *tty, struct sgttyb __user *sgttyb) |
| 725 | { |
| 726 | struct sgttyb tmp; |
| 727 | |
| 728 | mutex_lock(&tty->termios_mutex); |
| 729 | tmp.sg_ispeed = tty->termios->c_ispeed; |
| 730 | tmp.sg_ospeed = tty->termios->c_ospeed; |
| 731 | tmp.sg_erase = tty->termios->c_cc[VERASE]; |
| 732 | tmp.sg_kill = tty->termios->c_cc[VKILL]; |
| 733 | tmp.sg_flags = get_sgflags(tty); |
| 734 | mutex_unlock(&tty->termios_mutex); |
| 735 | |
| 736 | return copy_to_user(sgttyb, &tmp, sizeof(tmp)) ? -EFAULT : 0; |
| 737 | } |
| 738 | |
| 739 | static void set_sgflags(struct ktermios *termios, int flags) |
| 740 | { |
| 741 | termios->c_iflag = ICRNL | IXON; |
| 742 | termios->c_oflag = 0; |
| 743 | termios->c_lflag = ISIG | ICANON; |
| 744 | if (flags & 0x02) { /* cbreak */ |
| 745 | termios->c_iflag = 0; |
| 746 | termios->c_lflag &= ~ICANON; |
| 747 | } |
| 748 | if (flags & 0x08) { /* echo */ |
| 749 | termios->c_lflag |= ECHO | ECHOE | ECHOK | |
| 750 | ECHOCTL | ECHOKE | IEXTEN; |
| 751 | } |
| 752 | if (flags & 0x10) { /* crmod */ |
| 753 | termios->c_oflag |= OPOST | ONLCR; |
| 754 | } |
| 755 | if (flags & 0x20) { /* raw */ |
| 756 | termios->c_iflag = 0; |
| 757 | termios->c_lflag &= ~(ISIG | ICANON); |
| 758 | } |
| 759 | if (!(termios->c_lflag & ICANON)) { |
| 760 | termios->c_cc[VMIN] = 1; |
| 761 | termios->c_cc[VTIME] = 0; |
| 762 | } |
| 763 | } |
| 764 | |
| 765 | /** |
| 766 | * set_sgttyb - set legacy terminal values |
| 767 | * @tty: tty structure |
| 768 | * @sgttyb: pointer to old style terminal structure |
| 769 | * |
| 770 | * Updates a terminal from the legacy BSD style terminal information |
| 771 | * structure. |
| 772 | * |
| 773 | * Locking: termios_mutex |
| 774 | */ |
| 775 | |
| 776 | static int set_sgttyb(struct tty_struct *tty, struct sgttyb __user *sgttyb) |
| 777 | { |
| 778 | int retval; |
| 779 | struct sgttyb tmp; |
| 780 | struct ktermios termios; |
| 781 | |
| 782 | retval = tty_check_change(tty); |
| 783 | if (retval) |
| 784 | return retval; |
| 785 | |
| 786 | if (copy_from_user(&tmp, sgttyb, sizeof(tmp))) |
| 787 | return -EFAULT; |
| 788 | |
| 789 | mutex_lock(&tty->termios_mutex); |
| 790 | termios = *tty->termios; |
| 791 | termios.c_cc[VERASE] = tmp.sg_erase; |
| 792 | termios.c_cc[VKILL] = tmp.sg_kill; |
| 793 | set_sgflags(&termios, tmp.sg_flags); |
| 794 | /* Try and encode into Bfoo format */ |
| 795 | #ifdef BOTHER |
| 796 | tty_termios_encode_baud_rate(&termios, termios.c_ispeed, |
| 797 | termios.c_ospeed); |
| 798 | #endif |
| 799 | mutex_unlock(&tty->termios_mutex); |
| 800 | tty_set_termios(tty, &termios); |
| 801 | return 0; |
| 802 | } |
| 803 | #endif |
| 804 | |
| 805 | #ifdef TIOCGETC |
| 806 | static int get_tchars(struct tty_struct *tty, struct tchars __user *tchars) |
| 807 | { |
| 808 | struct tchars tmp; |
| 809 | |
| 810 | mutex_lock(&tty->termios_mutex); |
| 811 | tmp.t_intrc = tty->termios->c_cc[VINTR]; |
| 812 | tmp.t_quitc = tty->termios->c_cc[VQUIT]; |
| 813 | tmp.t_startc = tty->termios->c_cc[VSTART]; |
| 814 | tmp.t_stopc = tty->termios->c_cc[VSTOP]; |
| 815 | tmp.t_eofc = tty->termios->c_cc[VEOF]; |
| 816 | tmp.t_brkc = tty->termios->c_cc[VEOL2]; /* what is brkc anyway? */ |
| 817 | mutex_unlock(&tty->termios_mutex); |
| 818 | return copy_to_user(tchars, &tmp, sizeof(tmp)) ? -EFAULT : 0; |
| 819 | } |
| 820 | |
| 821 | static int set_tchars(struct tty_struct *tty, struct tchars __user *tchars) |
| 822 | { |
| 823 | struct tchars tmp; |
| 824 | |
| 825 | if (copy_from_user(&tmp, tchars, sizeof(tmp))) |
| 826 | return -EFAULT; |
| 827 | mutex_lock(&tty->termios_mutex); |
| 828 | tty->termios->c_cc[VINTR] = tmp.t_intrc; |
| 829 | tty->termios->c_cc[VQUIT] = tmp.t_quitc; |
| 830 | tty->termios->c_cc[VSTART] = tmp.t_startc; |
| 831 | tty->termios->c_cc[VSTOP] = tmp.t_stopc; |
| 832 | tty->termios->c_cc[VEOF] = tmp.t_eofc; |
| 833 | tty->termios->c_cc[VEOL2] = tmp.t_brkc; /* what is brkc anyway? */ |
| 834 | mutex_unlock(&tty->termios_mutex); |
| 835 | return 0; |
| 836 | } |
| 837 | #endif |
| 838 | |
| 839 | #ifdef TIOCGLTC |
| 840 | static int get_ltchars(struct tty_struct *tty, struct ltchars __user *ltchars) |
| 841 | { |
| 842 | struct ltchars tmp; |
| 843 | |
| 844 | mutex_lock(&tty->termios_mutex); |
| 845 | tmp.t_suspc = tty->termios->c_cc[VSUSP]; |
| 846 | /* what is dsuspc anyway? */ |
| 847 | tmp.t_dsuspc = tty->termios->c_cc[VSUSP]; |
| 848 | tmp.t_rprntc = tty->termios->c_cc[VREPRINT]; |
| 849 | /* what is flushc anyway? */ |
| 850 | tmp.t_flushc = tty->termios->c_cc[VEOL2]; |
| 851 | tmp.t_werasc = tty->termios->c_cc[VWERASE]; |
| 852 | tmp.t_lnextc = tty->termios->c_cc[VLNEXT]; |
| 853 | mutex_unlock(&tty->termios_mutex); |
| 854 | return copy_to_user(ltchars, &tmp, sizeof(tmp)) ? -EFAULT : 0; |
| 855 | } |
| 856 | |
| 857 | static int set_ltchars(struct tty_struct *tty, struct ltchars __user *ltchars) |
| 858 | { |
| 859 | struct ltchars tmp; |
| 860 | |
| 861 | if (copy_from_user(&tmp, ltchars, sizeof(tmp))) |
| 862 | return -EFAULT; |
| 863 | |
| 864 | mutex_lock(&tty->termios_mutex); |
| 865 | tty->termios->c_cc[VSUSP] = tmp.t_suspc; |
| 866 | /* what is dsuspc anyway? */ |
| 867 | tty->termios->c_cc[VEOL2] = tmp.t_dsuspc; |
| 868 | tty->termios->c_cc[VREPRINT] = tmp.t_rprntc; |
| 869 | /* what is flushc anyway? */ |
| 870 | tty->termios->c_cc[VEOL2] = tmp.t_flushc; |
| 871 | tty->termios->c_cc[VWERASE] = tmp.t_werasc; |
| 872 | tty->termios->c_cc[VLNEXT] = tmp.t_lnextc; |
| 873 | mutex_unlock(&tty->termios_mutex); |
| 874 | return 0; |
| 875 | } |
| 876 | #endif |
| 877 | |
| 878 | /** |
| 879 | * send_prio_char - send priority character |
| 880 | * |
| 881 | * Send a high priority character to the tty even if stopped |
| 882 | * |
| 883 | * Locking: none for xchar method, write ordering for write method. |
| 884 | */ |
| 885 | |
| 886 | static int send_prio_char(struct tty_struct *tty, char ch) |
| 887 | { |
| 888 | int was_stopped = tty->stopped; |
| 889 | |
| 890 | if (tty->ops->send_xchar) { |
| 891 | tty->ops->send_xchar(tty, ch); |
| 892 | return 0; |
| 893 | } |
| 894 | |
| 895 | if (tty_write_lock(tty, 0) < 0) |
| 896 | return -ERESTARTSYS; |
| 897 | |
| 898 | if (was_stopped) |
| 899 | start_tty(tty); |
| 900 | tty->ops->write(tty, &ch, 1); |
| 901 | if (was_stopped) |
| 902 | stop_tty(tty); |
| 903 | tty_write_unlock(tty); |
| 904 | return 0; |
| 905 | } |
| 906 | |
| 907 | /** |
| 908 | * tty_change_softcar - carrier change ioctl helper |
| 909 | * @tty: tty to update |
| 910 | * @arg: enable/disable CLOCAL |
| 911 | * |
| 912 | * Perform a change to the CLOCAL state and call into the driver |
| 913 | * layer to make it visible. All done with the termios mutex |
| 914 | */ |
| 915 | |
| 916 | static int tty_change_softcar(struct tty_struct *tty, int arg) |
| 917 | { |
| 918 | int ret = 0; |
| 919 | int bit = arg ? CLOCAL : 0; |
| 920 | struct ktermios old; |
| 921 | |
| 922 | mutex_lock(&tty->termios_mutex); |
| 923 | old = *tty->termios; |
| 924 | tty->termios->c_cflag &= ~CLOCAL; |
| 925 | tty->termios->c_cflag |= bit; |
| 926 | if (tty->ops->set_termios) |
| 927 | tty->ops->set_termios(tty, &old); |
| 928 | if ((tty->termios->c_cflag & CLOCAL) != bit) |
| 929 | ret = -EINVAL; |
| 930 | mutex_unlock(&tty->termios_mutex); |
| 931 | return ret; |
| 932 | } |
| 933 | |
| 934 | /** |
| 935 | * tty_mode_ioctl - mode related ioctls |
| 936 | * @tty: tty for the ioctl |
| 937 | * @file: file pointer for the tty |
| 938 | * @cmd: command |
| 939 | * @arg: ioctl argument |
| 940 | * |
| 941 | * Perform non line discipline specific mode control ioctls. This |
| 942 | * is designed to be called by line disciplines to ensure they provide |
| 943 | * consistent mode setting. |
| 944 | */ |
| 945 | |
| 946 | int tty_mode_ioctl(struct tty_struct *tty, struct file *file, |
| 947 | unsigned int cmd, unsigned long arg) |
| 948 | { |
| 949 | struct tty_struct *real_tty; |
| 950 | void __user *p = (void __user *)arg; |
| 951 | int ret = 0; |
| 952 | struct ktermios kterm; |
| 953 | |
| 954 | BUG_ON(file == NULL); |
| 955 | |
| 956 | if (tty->driver->type == TTY_DRIVER_TYPE_PTY && |
| 957 | tty->driver->subtype == PTY_TYPE_MASTER) |
| 958 | real_tty = tty->link; |
| 959 | else |
| 960 | real_tty = tty; |
| 961 | |
| 962 | switch (cmd) { |
| 963 | #ifdef TIOCGETP |
| 964 | case TIOCGETP: |
| 965 | return get_sgttyb(real_tty, (struct sgttyb __user *) arg); |
| 966 | case TIOCSETP: |
| 967 | case TIOCSETN: |
| 968 | return set_sgttyb(real_tty, (struct sgttyb __user *) arg); |
| 969 | #endif |
| 970 | #ifdef TIOCGETC |
| 971 | case TIOCGETC: |
| 972 | return get_tchars(real_tty, p); |
| 973 | case TIOCSETC: |
| 974 | return set_tchars(real_tty, p); |
| 975 | #endif |
| 976 | #ifdef TIOCGLTC |
| 977 | case TIOCGLTC: |
| 978 | return get_ltchars(real_tty, p); |
| 979 | case TIOCSLTC: |
| 980 | return set_ltchars(real_tty, p); |
| 981 | #endif |
| 982 | case TCSETSF: |
| 983 | return set_termios(real_tty, p, TERMIOS_FLUSH | TERMIOS_WAIT | TERMIOS_OLD); |
| 984 | case TCSETSW: |
| 985 | return set_termios(real_tty, p, TERMIOS_WAIT | TERMIOS_OLD); |
| 986 | case TCSETS: |
| 987 | return set_termios(real_tty, p, TERMIOS_OLD); |
| 988 | #ifndef TCGETS2 |
| 989 | case TCGETS: |
| 990 | copy_termios(real_tty, &kterm); |
| 991 | if (kernel_termios_to_user_termios((struct termios __user *)arg, &kterm)) |
| 992 | ret = -EFAULT; |
| 993 | return ret; |
| 994 | #else |
| 995 | case TCGETS: |
| 996 | copy_termios(real_tty, &kterm); |
| 997 | if (kernel_termios_to_user_termios_1((struct termios __user *)arg, &kterm)) |
| 998 | ret = -EFAULT; |
| 999 | return ret; |
| 1000 | case TCGETS2: |
| 1001 | copy_termios(real_tty, &kterm); |
| 1002 | if (kernel_termios_to_user_termios((struct termios2 __user *)arg, &kterm)) |
| 1003 | ret = -EFAULT; |
| 1004 | return ret; |
| 1005 | case TCSETSF2: |
| 1006 | return set_termios(real_tty, p, TERMIOS_FLUSH | TERMIOS_WAIT); |
| 1007 | case TCSETSW2: |
| 1008 | return set_termios(real_tty, p, TERMIOS_WAIT); |
| 1009 | case TCSETS2: |
| 1010 | return set_termios(real_tty, p, 0); |
| 1011 | #endif |
| 1012 | case TCGETA: |
| 1013 | return get_termio(real_tty, p); |
| 1014 | case TCSETAF: |
| 1015 | return set_termios(real_tty, p, TERMIOS_FLUSH | TERMIOS_WAIT | TERMIOS_TERMIO); |
| 1016 | case TCSETAW: |
| 1017 | return set_termios(real_tty, p, TERMIOS_WAIT | TERMIOS_TERMIO); |
| 1018 | case TCSETA: |
| 1019 | return set_termios(real_tty, p, TERMIOS_TERMIO); |
| 1020 | #ifndef TCGETS2 |
| 1021 | case TIOCGLCKTRMIOS: |
| 1022 | copy_termios_locked(real_tty, &kterm); |
| 1023 | if (kernel_termios_to_user_termios((struct termios __user *)arg, &kterm)) |
| 1024 | ret = -EFAULT; |
| 1025 | return ret; |
| 1026 | case TIOCSLCKTRMIOS: |
| 1027 | if (!capable(CAP_SYS_ADMIN)) |
| 1028 | return -EPERM; |
| 1029 | copy_termios_locked(real_tty, &kterm); |
| 1030 | if (user_termios_to_kernel_termios(&kterm, |
| 1031 | (struct termios __user *) arg)) |
| 1032 | return -EFAULT; |
| 1033 | mutex_lock(&real_tty->termios_mutex); |
| 1034 | memcpy(real_tty->termios_locked, &kterm, sizeof(struct ktermios)); |
| 1035 | mutex_unlock(&real_tty->termios_mutex); |
| 1036 | return 0; |
| 1037 | #else |
| 1038 | case TIOCGLCKTRMIOS: |
| 1039 | copy_termios_locked(real_tty, &kterm); |
| 1040 | if (kernel_termios_to_user_termios_1((struct termios __user *)arg, &kterm)) |
| 1041 | ret = -EFAULT; |
| 1042 | return ret; |
| 1043 | case TIOCSLCKTRMIOS: |
| 1044 | if (!capable(CAP_SYS_ADMIN)) |
| 1045 | return -EPERM; |
| 1046 | copy_termios_locked(real_tty, &kterm); |
| 1047 | if (user_termios_to_kernel_termios_1(&kterm, |
| 1048 | (struct termios __user *) arg)) |
| 1049 | return -EFAULT; |
| 1050 | mutex_lock(&real_tty->termios_mutex); |
| 1051 | memcpy(real_tty->termios_locked, &kterm, sizeof(struct ktermios)); |
| 1052 | mutex_unlock(&real_tty->termios_mutex); |
| 1053 | return ret; |
| 1054 | #endif |
| 1055 | #ifdef TCGETX |
| 1056 | case TCGETX: { |
| 1057 | struct termiox ktermx; |
| 1058 | if (real_tty->termiox == NULL) |
| 1059 | return -EINVAL; |
| 1060 | mutex_lock(&real_tty->termios_mutex); |
| 1061 | memcpy(&ktermx, real_tty->termiox, sizeof(struct termiox)); |
| 1062 | mutex_unlock(&real_tty->termios_mutex); |
| 1063 | if (copy_to_user(p, &ktermx, sizeof(struct termiox))) |
| 1064 | ret = -EFAULT; |
| 1065 | return ret; |
| 1066 | } |
| 1067 | case TCSETX: |
| 1068 | return set_termiox(real_tty, p, 0); |
| 1069 | case TCSETXW: |
| 1070 | return set_termiox(real_tty, p, TERMIOS_WAIT); |
| 1071 | case TCSETXF: |
| 1072 | return set_termiox(real_tty, p, TERMIOS_FLUSH); |
| 1073 | #endif |
| 1074 | case TIOCGSOFTCAR: |
| 1075 | copy_termios(real_tty, &kterm); |
| 1076 | ret = put_user((kterm.c_cflag & CLOCAL) ? 1 : 0, |
| 1077 | (int __user *)arg); |
| 1078 | return ret; |
| 1079 | case TIOCSSOFTCAR: |
| 1080 | if (get_user(arg, (unsigned int __user *) arg)) |
| 1081 | return -EFAULT; |
| 1082 | return tty_change_softcar(real_tty, arg); |
| 1083 | default: |
| 1084 | return -ENOIOCTLCMD; |
| 1085 | } |
| 1086 | } |
| 1087 | EXPORT_SYMBOL_GPL(tty_mode_ioctl); |
| 1088 | |
| 1089 | int tty_perform_flush(struct tty_struct *tty, unsigned long arg) |
| 1090 | { |
| 1091 | struct tty_ldisc *ld; |
| 1092 | int retval = tty_check_change(tty); |
| 1093 | if (retval) |
| 1094 | return retval; |
| 1095 | |
| 1096 | ld = tty_ldisc_ref_wait(tty); |
| 1097 | switch (arg) { |
| 1098 | case TCIFLUSH: |
| 1099 | if (ld && ld->ops->flush_buffer) |
| 1100 | ld->ops->flush_buffer(tty); |
| 1101 | break; |
| 1102 | case TCIOFLUSH: |
| 1103 | if (ld && ld->ops->flush_buffer) |
| 1104 | ld->ops->flush_buffer(tty); |
| 1105 | /* fall through */ |
| 1106 | case TCOFLUSH: |
| 1107 | tty_driver_flush_buffer(tty); |
| 1108 | break; |
| 1109 | default: |
| 1110 | tty_ldisc_deref(ld); |
| 1111 | return -EINVAL; |
| 1112 | } |
| 1113 | tty_ldisc_deref(ld); |
| 1114 | return 0; |
| 1115 | } |
| 1116 | EXPORT_SYMBOL_GPL(tty_perform_flush); |
| 1117 | |
| 1118 | int n_tty_ioctl_helper(struct tty_struct *tty, struct file *file, |
| 1119 | unsigned int cmd, unsigned long arg) |
| 1120 | { |
| 1121 | unsigned long flags; |
| 1122 | int retval; |
| 1123 | |
| 1124 | switch (cmd) { |
| 1125 | case TCXONC: |
| 1126 | retval = tty_check_change(tty); |
| 1127 | if (retval) |
| 1128 | return retval; |
| 1129 | switch (arg) { |
| 1130 | case TCOOFF: |
| 1131 | if (!tty->flow_stopped) { |
| 1132 | tty->flow_stopped = 1; |
| 1133 | stop_tty(tty); |
| 1134 | } |
| 1135 | break; |
| 1136 | case TCOON: |
| 1137 | if (tty->flow_stopped) { |
| 1138 | tty->flow_stopped = 0; |
| 1139 | start_tty(tty); |
| 1140 | } |
| 1141 | break; |
| 1142 | case TCIOFF: |
| 1143 | if (STOP_CHAR(tty) != __DISABLED_CHAR) |
| 1144 | return send_prio_char(tty, STOP_CHAR(tty)); |
| 1145 | break; |
| 1146 | case TCION: |
| 1147 | if (START_CHAR(tty) != __DISABLED_CHAR) |
| 1148 | return send_prio_char(tty, START_CHAR(tty)); |
| 1149 | break; |
| 1150 | default: |
| 1151 | return -EINVAL; |
| 1152 | } |
| 1153 | return 0; |
| 1154 | case TCFLSH: |
| 1155 | return tty_perform_flush(tty, arg); |
| 1156 | case TIOCPKT: |
| 1157 | { |
| 1158 | int pktmode; |
| 1159 | |
| 1160 | if (tty->driver->type != TTY_DRIVER_TYPE_PTY || |
| 1161 | tty->driver->subtype != PTY_TYPE_MASTER) |
| 1162 | return -ENOTTY; |
| 1163 | if (get_user(pktmode, (int __user *) arg)) |
| 1164 | return -EFAULT; |
| 1165 | spin_lock_irqsave(&tty->ctrl_lock, flags); |
| 1166 | if (pktmode) { |
| 1167 | if (!tty->packet) { |
| 1168 | tty->packet = 1; |
| 1169 | tty->link->ctrl_status = 0; |
| 1170 | } |
| 1171 | } else |
| 1172 | tty->packet = 0; |
| 1173 | spin_unlock_irqrestore(&tty->ctrl_lock, flags); |
| 1174 | return 0; |
| 1175 | } |
| 1176 | default: |
| 1177 | /* Try the mode commands */ |
| 1178 | return tty_mode_ioctl(tty, file, cmd, arg); |
| 1179 | } |
| 1180 | } |
| 1181 | EXPORT_SYMBOL(n_tty_ioctl_helper); |