Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/drivers/char/tty_ioctl.c |
| 3 | * |
| 4 | * Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds |
| 5 | * |
| 6 | * Modified by Fred N. van Kempen, 01/29/93, to add line disciplines |
| 7 | * which can be dynamically activated and de-activated by the line |
| 8 | * discipline handling modules (like SLIP). |
| 9 | */ |
| 10 | |
| 11 | #include <linux/types.h> |
| 12 | #include <linux/termios.h> |
| 13 | #include <linux/errno.h> |
| 14 | #include <linux/sched.h> |
| 15 | #include <linux/kernel.h> |
| 16 | #include <linux/major.h> |
| 17 | #include <linux/tty.h> |
| 18 | #include <linux/fcntl.h> |
| 19 | #include <linux/string.h> |
| 20 | #include <linux/mm.h> |
| 21 | #include <linux/module.h> |
| 22 | #include <linux/bitops.h> |
Arjan van de Ven | 5785c95 | 2006-09-29 02:00:43 -0700 | [diff] [blame] | 23 | #include <linux/mutex.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | |
| 25 | #include <asm/io.h> |
| 26 | #include <asm/uaccess.h> |
| 27 | #include <asm/system.h> |
| 28 | |
| 29 | #undef TTY_DEBUG_WAIT_UNTIL_SENT |
| 30 | |
| 31 | #undef DEBUG |
| 32 | |
| 33 | /* |
| 34 | * Internal flag options for termios setting behavior |
| 35 | */ |
| 36 | #define TERMIOS_FLUSH 1 |
| 37 | #define TERMIOS_WAIT 2 |
| 38 | #define TERMIOS_TERMIO 4 |
Alan Cox | edc6afc | 2006-12-08 02:38:44 -0800 | [diff] [blame] | 39 | #define TERMIOS_OLD 8 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 40 | |
Alan Cox | af9b897 | 2006-08-27 01:24:01 -0700 | [diff] [blame] | 41 | |
| 42 | /** |
| 43 | * tty_wait_until_sent - wait for I/O to finish |
| 44 | * @tty: tty we are waiting for |
| 45 | * @timeout: how long we will wait |
| 46 | * |
| 47 | * Wait for characters pending in a tty driver to hit the wire, or |
| 48 | * for a timeout to occur (eg due to flow control) |
| 49 | * |
| 50 | * Locking: none |
| 51 | */ |
| 52 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 53 | void tty_wait_until_sent(struct tty_struct * tty, long timeout) |
| 54 | { |
| 55 | DECLARE_WAITQUEUE(wait, current); |
| 56 | |
| 57 | #ifdef TTY_DEBUG_WAIT_UNTIL_SENT |
| 58 | char buf[64]; |
| 59 | |
| 60 | printk(KERN_DEBUG "%s wait until sent...\n", tty_name(tty, buf)); |
| 61 | #endif |
| 62 | if (!tty->driver->chars_in_buffer) |
| 63 | return; |
| 64 | add_wait_queue(&tty->write_wait, &wait); |
| 65 | if (!timeout) |
| 66 | timeout = MAX_SCHEDULE_TIMEOUT; |
| 67 | do { |
| 68 | #ifdef TTY_DEBUG_WAIT_UNTIL_SENT |
| 69 | printk(KERN_DEBUG "waiting %s...(%d)\n", tty_name(tty, buf), |
| 70 | tty->driver->chars_in_buffer(tty)); |
| 71 | #endif |
| 72 | set_current_state(TASK_INTERRUPTIBLE); |
| 73 | if (signal_pending(current)) |
| 74 | goto stop_waiting; |
| 75 | if (!tty->driver->chars_in_buffer(tty)) |
| 76 | break; |
| 77 | timeout = schedule_timeout(timeout); |
| 78 | } while (timeout); |
| 79 | if (tty->driver->wait_until_sent) |
| 80 | tty->driver->wait_until_sent(tty, timeout); |
| 81 | stop_waiting: |
| 82 | set_current_state(TASK_RUNNING); |
| 83 | remove_wait_queue(&tty->write_wait, &wait); |
| 84 | } |
| 85 | |
| 86 | EXPORT_SYMBOL(tty_wait_until_sent); |
| 87 | |
Alan Cox | edc6afc | 2006-12-08 02:38:44 -0800 | [diff] [blame] | 88 | static void unset_locked_termios(struct ktermios *termios, |
| 89 | struct ktermios *old, |
| 90 | struct ktermios *locked) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 91 | { |
| 92 | int i; |
| 93 | |
| 94 | #define NOSET_MASK(x,y,z) (x = ((x) & ~(z)) | ((y) & (z))) |
| 95 | |
| 96 | if (!locked) { |
| 97 | printk(KERN_WARNING "Warning?!? termios_locked is NULL.\n"); |
| 98 | return; |
| 99 | } |
| 100 | |
| 101 | NOSET_MASK(termios->c_iflag, old->c_iflag, locked->c_iflag); |
| 102 | NOSET_MASK(termios->c_oflag, old->c_oflag, locked->c_oflag); |
| 103 | NOSET_MASK(termios->c_cflag, old->c_cflag, locked->c_cflag); |
| 104 | NOSET_MASK(termios->c_lflag, old->c_lflag, locked->c_lflag); |
| 105 | termios->c_line = locked->c_line ? old->c_line : termios->c_line; |
| 106 | for (i=0; i < NCCS; i++) |
| 107 | termios->c_cc[i] = locked->c_cc[i] ? |
| 108 | old->c_cc[i] : termios->c_cc[i]; |
Alan Cox | edc6afc | 2006-12-08 02:38:44 -0800 | [diff] [blame] | 109 | /* FIXME: What should we do for i/ospeed */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 110 | } |
| 111 | |
Alan Cox | edc6afc | 2006-12-08 02:38:44 -0800 | [diff] [blame] | 112 | /* |
| 113 | * Routine which returns the baud rate of the tty |
| 114 | * |
| 115 | * Note that the baud_table needs to be kept in sync with the |
| 116 | * include/asm/termbits.h file. |
| 117 | */ |
| 118 | static const speed_t baud_table[] = { |
| 119 | 0, 50, 75, 110, 134, 150, 200, 300, 600, 1200, 1800, 2400, 4800, |
| 120 | 9600, 19200, 38400, 57600, 115200, 230400, 460800, |
| 121 | #ifdef __sparc__ |
| 122 | 76800, 153600, 307200, 614400, 921600 |
| 123 | #else |
| 124 | 500000, 576000, 921600, 1000000, 1152000, 1500000, 2000000, |
| 125 | 2500000, 3000000, 3500000, 4000000 |
| 126 | #endif |
| 127 | }; |
| 128 | |
| 129 | #ifndef __sparc__ |
| 130 | static const tcflag_t baud_bits[] = { |
| 131 | B0, B50, B75, B110, B134, B150, B200, B300, B600, |
| 132 | B1200, B1800, B2400, B4800, B9600, B19200, B38400, |
| 133 | B57600, B115200, B230400, B460800, B500000, B576000, |
| 134 | B921600, B1000000, B1152000, B1500000, B2000000, B2500000, |
| 135 | B3000000, B3500000, B4000000 |
| 136 | }; |
| 137 | #else |
| 138 | static const tcflag_t baud_bits[] = { |
| 139 | B0, B50, B75, B110, B134, B150, B200, B300, B600, |
| 140 | B1200, B1800, B2400, B4800, B9600, B19200, B38400, |
| 141 | B57600, B115200, B230400, B460800, B76800, B153600, |
| 142 | B307200, B614400, B921600 |
| 143 | }; |
| 144 | #endif |
| 145 | |
| 146 | static int n_baud_table = ARRAY_SIZE(baud_table); |
| 147 | |
| 148 | /** |
| 149 | * tty_termios_baud_rate |
| 150 | * @termios: termios structure |
| 151 | * |
| 152 | * Convert termios baud rate data into a speed. This should be called |
| 153 | * with the termios lock held if this termios is a terminal termios |
| 154 | * structure. May change the termios data. Device drivers can call this |
| 155 | * function but should use ->c_[io]speed directly as they are updated. |
| 156 | * |
| 157 | * Locking: none |
| 158 | */ |
| 159 | |
| 160 | speed_t tty_termios_baud_rate(struct ktermios *termios) |
| 161 | { |
| 162 | unsigned int cbaud; |
| 163 | |
| 164 | cbaud = termios->c_cflag & CBAUD; |
| 165 | |
| 166 | #ifdef BOTHER |
| 167 | /* Magic token for arbitary speed via c_ispeed/c_ospeed */ |
| 168 | if (cbaud == BOTHER) |
| 169 | return termios->c_ospeed; |
| 170 | #endif |
| 171 | if (cbaud & CBAUDEX) { |
| 172 | cbaud &= ~CBAUDEX; |
| 173 | |
| 174 | if (cbaud < 1 || cbaud + 15 > n_baud_table) |
| 175 | termios->c_cflag &= ~CBAUDEX; |
| 176 | else |
| 177 | cbaud += 15; |
| 178 | } |
| 179 | return baud_table[cbaud]; |
| 180 | } |
| 181 | |
| 182 | EXPORT_SYMBOL(tty_termios_baud_rate); |
| 183 | |
| 184 | /** |
| 185 | * tty_termios_input_baud_rate |
| 186 | * @termios: termios structure |
| 187 | * |
| 188 | * Convert termios baud rate data into a speed. This should be called |
| 189 | * with the termios lock held if this termios is a terminal termios |
| 190 | * structure. May change the termios data. Device drivers can call this |
| 191 | * function but should use ->c_[io]speed directly as they are updated. |
| 192 | * |
| 193 | * Locking: none |
| 194 | */ |
| 195 | |
| 196 | speed_t tty_termios_input_baud_rate(struct ktermios *termios) |
| 197 | { |
| 198 | #ifdef IBSHIFT |
| 199 | unsigned int cbaud = (termios->c_cflag >> IBSHIFT) & CBAUD; |
| 200 | |
| 201 | if (cbaud == B0) |
| 202 | return tty_termios_baud_rate(termios); |
| 203 | |
| 204 | /* Magic token for arbitary speed via c_ispeed*/ |
| 205 | if (cbaud == BOTHER) |
| 206 | return termios->c_ispeed; |
| 207 | |
| 208 | if (cbaud & CBAUDEX) { |
| 209 | cbaud &= ~CBAUDEX; |
| 210 | |
| 211 | if (cbaud < 1 || cbaud + 15 > n_baud_table) |
| 212 | termios->c_cflag &= ~(CBAUDEX << IBSHIFT); |
| 213 | else |
| 214 | cbaud += 15; |
| 215 | } |
| 216 | return baud_table[cbaud]; |
| 217 | #else |
| 218 | return tty_termios_baud_rate(termios); |
| 219 | #endif |
| 220 | } |
| 221 | |
| 222 | EXPORT_SYMBOL(tty_termios_input_baud_rate); |
| 223 | |
| 224 | #ifdef BOTHER |
| 225 | |
| 226 | /** |
| 227 | * tty_termios_encode_baud_rate |
| 228 | * @termios: termios structure |
| 229 | * @ispeed: input speed |
| 230 | * @ospeed: output speed |
| 231 | * |
| 232 | * Encode the speeds set into the passed termios structure. This is |
| 233 | * used as a library helper for drivers os that they can report back |
| 234 | * the actual speed selected when it differs from the speed requested |
| 235 | * |
| 236 | * For now input and output speed must agree. |
| 237 | * |
| 238 | * Locking: Caller should hold termios lock. This is already held |
| 239 | * when calling this function from the driver termios handler. |
| 240 | */ |
| 241 | |
| 242 | void tty_termios_encode_baud_rate(struct ktermios *termios, speed_t ibaud, speed_t obaud) |
| 243 | { |
| 244 | int i = 0; |
| 245 | int ifound = 0, ofound = 0; |
| 246 | |
| 247 | termios->c_ispeed = ibaud; |
| 248 | termios->c_ospeed = obaud; |
| 249 | |
| 250 | termios->c_cflag &= ~CBAUD; |
| 251 | /* Identical speed means no input encoding (ie B0 << IBSHIFT)*/ |
| 252 | if (termios->c_ispeed == termios->c_ospeed) |
| 253 | ifound = 1; |
| 254 | |
| 255 | do { |
| 256 | if (obaud == baud_table[i]) { |
| 257 | termios->c_cflag |= baud_bits[i]; |
| 258 | ofound = 1; |
| 259 | /* So that if ibaud == obaud we don't set it */ |
| 260 | continue; |
| 261 | } |
| 262 | if (ibaud == baud_table[i]) { |
| 263 | termios->c_cflag |= (baud_bits[i] << IBSHIFT); |
| 264 | ifound = 1; |
| 265 | } |
| 266 | } |
| 267 | while(++i < n_baud_table); |
| 268 | if (!ofound) |
| 269 | termios->c_cflag |= BOTHER; |
| 270 | if (!ifound) |
| 271 | termios->c_cflag |= (BOTHER << IBSHIFT); |
| 272 | } |
| 273 | |
| 274 | EXPORT_SYMBOL_GPL(tty_termios_encode_baud_rate); |
| 275 | |
| 276 | #endif |
| 277 | |
| 278 | /** |
| 279 | * tty_get_baud_rate - get tty bit rates |
| 280 | * @tty: tty to query |
| 281 | * |
| 282 | * Returns the baud rate as an integer for this terminal. The |
| 283 | * termios lock must be held by the caller and the terminal bit |
| 284 | * flags may be updated. |
| 285 | * |
| 286 | * Locking: none |
| 287 | */ |
| 288 | |
| 289 | speed_t tty_get_baud_rate(struct tty_struct *tty) |
| 290 | { |
| 291 | speed_t baud = tty_termios_baud_rate(tty->termios); |
| 292 | |
| 293 | if (baud == 38400 && tty->alt_speed) { |
| 294 | if (!tty->warned) { |
| 295 | printk(KERN_WARNING "Use of setserial/setrocket to " |
| 296 | "set SPD_* flags is deprecated\n"); |
| 297 | tty->warned = 1; |
| 298 | } |
| 299 | baud = tty->alt_speed; |
| 300 | } |
| 301 | |
| 302 | return baud; |
| 303 | } |
| 304 | |
| 305 | EXPORT_SYMBOL(tty_get_baud_rate); |
| 306 | |
Alan Cox | af9b897 | 2006-08-27 01:24:01 -0700 | [diff] [blame] | 307 | /** |
| 308 | * change_termios - update termios values |
| 309 | * @tty: tty to update |
| 310 | * @new_termios: desired new value |
| 311 | * |
| 312 | * Perform updates to the termios values set on this terminal. There |
| 313 | * is a bit of layering violation here with n_tty in terms of the |
| 314 | * internal knowledge of this function. |
| 315 | * |
| 316 | * Locking: termios_sem |
| 317 | */ |
| 318 | |
Alan Cox | edc6afc | 2006-12-08 02:38:44 -0800 | [diff] [blame] | 319 | static void change_termios(struct tty_struct * tty, struct ktermios * new_termios) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 320 | { |
| 321 | int canon_change; |
Alan Cox | edc6afc | 2006-12-08 02:38:44 -0800 | [diff] [blame] | 322 | struct ktermios old_termios = *tty->termios; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 323 | struct tty_ldisc *ld; |
| 324 | |
| 325 | /* |
| 326 | * Perform the actual termios internal changes under lock. |
| 327 | */ |
| 328 | |
| 329 | |
| 330 | /* FIXME: we need to decide on some locking/ordering semantics |
| 331 | for the set_termios notification eventually */ |
Arjan van de Ven | 5785c95 | 2006-09-29 02:00:43 -0700 | [diff] [blame] | 332 | mutex_lock(&tty->termios_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 333 | |
| 334 | *tty->termios = *new_termios; |
| 335 | unset_locked_termios(tty->termios, &old_termios, tty->termios_locked); |
| 336 | canon_change = (old_termios.c_lflag ^ tty->termios->c_lflag) & ICANON; |
| 337 | if (canon_change) { |
| 338 | memset(&tty->read_flags, 0, sizeof tty->read_flags); |
| 339 | tty->canon_head = tty->read_tail; |
| 340 | tty->canon_data = 0; |
| 341 | tty->erasing = 0; |
| 342 | } |
| 343 | |
| 344 | |
| 345 | if (canon_change && !L_ICANON(tty) && tty->read_cnt) |
| 346 | /* Get characters left over from canonical mode. */ |
| 347 | wake_up_interruptible(&tty->read_wait); |
| 348 | |
| 349 | /* See if packet mode change of state. */ |
| 350 | |
| 351 | if (tty->link && tty->link->packet) { |
| 352 | int old_flow = ((old_termios.c_iflag & IXON) && |
| 353 | (old_termios.c_cc[VSTOP] == '\023') && |
| 354 | (old_termios.c_cc[VSTART] == '\021')); |
| 355 | int new_flow = (I_IXON(tty) && |
| 356 | STOP_CHAR(tty) == '\023' && |
| 357 | START_CHAR(tty) == '\021'); |
| 358 | if (old_flow != new_flow) { |
| 359 | tty->ctrl_status &= ~(TIOCPKT_DOSTOP | TIOCPKT_NOSTOP); |
| 360 | if (new_flow) |
| 361 | tty->ctrl_status |= TIOCPKT_DOSTOP; |
| 362 | else |
| 363 | tty->ctrl_status |= TIOCPKT_NOSTOP; |
| 364 | wake_up_interruptible(&tty->link->read_wait); |
| 365 | } |
| 366 | } |
| 367 | |
| 368 | if (tty->driver->set_termios) |
| 369 | (*tty->driver->set_termios)(tty, &old_termios); |
| 370 | |
| 371 | ld = tty_ldisc_ref(tty); |
| 372 | if (ld != NULL) { |
| 373 | if (ld->set_termios) |
| 374 | (ld->set_termios)(tty, &old_termios); |
| 375 | tty_ldisc_deref(ld); |
| 376 | } |
Arjan van de Ven | 5785c95 | 2006-09-29 02:00:43 -0700 | [diff] [blame] | 377 | mutex_unlock(&tty->termios_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 378 | } |
| 379 | |
Alan Cox | af9b897 | 2006-08-27 01:24:01 -0700 | [diff] [blame] | 380 | /** |
| 381 | * set_termios - set termios values for a tty |
| 382 | * @tty: terminal device |
| 383 | * @arg: user data |
| 384 | * @opt: option information |
| 385 | * |
| 386 | * Helper function to prepare termios data and run neccessary other |
| 387 | * functions before using change_termios to do the actual changes. |
| 388 | * |
| 389 | * Locking: |
| 390 | * Called functions take ldisc and termios_sem locks |
| 391 | */ |
| 392 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 393 | static int set_termios(struct tty_struct * tty, void __user *arg, int opt) |
| 394 | { |
Alan Cox | edc6afc | 2006-12-08 02:38:44 -0800 | [diff] [blame] | 395 | struct ktermios tmp_termios; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 396 | struct tty_ldisc *ld; |
| 397 | int retval = tty_check_change(tty); |
| 398 | |
| 399 | if (retval) |
| 400 | return retval; |
| 401 | |
Alan Cox | 64bb6c5 | 2006-12-08 02:38:47 -0800 | [diff] [blame] | 402 | memcpy(&tmp_termios, tty->termios, sizeof(struct ktermios)); |
| 403 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 404 | if (opt & TERMIOS_TERMIO) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 405 | if (user_termio_to_kernel_termios(&tmp_termios, |
| 406 | (struct termio __user *)arg)) |
| 407 | return -EFAULT; |
Alan Cox | edc6afc | 2006-12-08 02:38:44 -0800 | [diff] [blame] | 408 | #ifdef TCGETS2 |
| 409 | } else if (opt & TERMIOS_OLD) { |
Alan Cox | edc6afc | 2006-12-08 02:38:44 -0800 | [diff] [blame] | 410 | if (user_termios_to_kernel_termios_1(&tmp_termios, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 411 | (struct termios __user *)arg)) |
| 412 | return -EFAULT; |
Alan Cox | 64bb6c5 | 2006-12-08 02:38:47 -0800 | [diff] [blame] | 413 | } else { |
| 414 | if (user_termios_to_kernel_termios(&tmp_termios, |
| 415 | (struct termios2 __user *)arg)) |
| 416 | return -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 417 | } |
Alan Cox | 64bb6c5 | 2006-12-08 02:38:47 -0800 | [diff] [blame] | 418 | #else |
| 419 | } else if (user_termios_to_kernel_termios(&tmp_termios, |
| 420 | (struct termios __user *)arg)) |
| 421 | return -EFAULT; |
| 422 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 423 | |
Alan Cox | edc6afc | 2006-12-08 02:38:44 -0800 | [diff] [blame] | 424 | /* If old style Bfoo values are used then load c_ispeed/c_ospeed with the real speed |
| 425 | so its unconditionally usable */ |
| 426 | tmp_termios.c_ispeed = tty_termios_input_baud_rate(&tmp_termios); |
| 427 | tmp_termios.c_ospeed = tty_termios_baud_rate(&tmp_termios); |
| 428 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 429 | ld = tty_ldisc_ref(tty); |
| 430 | |
| 431 | if (ld != NULL) { |
| 432 | if ((opt & TERMIOS_FLUSH) && ld->flush_buffer) |
| 433 | ld->flush_buffer(tty); |
| 434 | tty_ldisc_deref(ld); |
| 435 | } |
| 436 | |
| 437 | if (opt & TERMIOS_WAIT) { |
| 438 | tty_wait_until_sent(tty, 0); |
| 439 | if (signal_pending(current)) |
| 440 | return -EINTR; |
| 441 | } |
| 442 | |
| 443 | change_termios(tty, &tmp_termios); |
| 444 | return 0; |
| 445 | } |
| 446 | |
| 447 | static int get_termio(struct tty_struct * tty, struct termio __user * termio) |
| 448 | { |
| 449 | if (kernel_termios_to_user_termio(termio, tty->termios)) |
| 450 | return -EFAULT; |
| 451 | return 0; |
| 452 | } |
| 453 | |
| 454 | static unsigned long inq_canon(struct tty_struct * tty) |
| 455 | { |
| 456 | int nr, head, tail; |
| 457 | |
| 458 | if (!tty->canon_data || !tty->read_buf) |
| 459 | return 0; |
| 460 | head = tty->canon_head; |
| 461 | tail = tty->read_tail; |
| 462 | nr = (head - tail) & (N_TTY_BUF_SIZE-1); |
| 463 | /* Skip EOF-chars.. */ |
| 464 | while (head != tail) { |
| 465 | if (test_bit(tail, tty->read_flags) && |
| 466 | tty->read_buf[tail] == __DISABLED_CHAR) |
| 467 | nr--; |
| 468 | tail = (tail+1) & (N_TTY_BUF_SIZE-1); |
| 469 | } |
| 470 | return nr; |
| 471 | } |
| 472 | |
| 473 | #ifdef TIOCGETP |
| 474 | /* |
| 475 | * These are deprecated, but there is limited support.. |
| 476 | * |
| 477 | * The "sg_flags" translation is a joke.. |
| 478 | */ |
| 479 | static int get_sgflags(struct tty_struct * tty) |
| 480 | { |
| 481 | int flags = 0; |
| 482 | |
| 483 | if (!(tty->termios->c_lflag & ICANON)) { |
| 484 | if (tty->termios->c_lflag & ISIG) |
| 485 | flags |= 0x02; /* cbreak */ |
| 486 | else |
| 487 | flags |= 0x20; /* raw */ |
| 488 | } |
| 489 | if (tty->termios->c_lflag & ECHO) |
| 490 | flags |= 0x08; /* echo */ |
| 491 | if (tty->termios->c_oflag & OPOST) |
| 492 | if (tty->termios->c_oflag & ONLCR) |
| 493 | flags |= 0x10; /* crmod */ |
| 494 | return flags; |
| 495 | } |
| 496 | |
| 497 | static int get_sgttyb(struct tty_struct * tty, struct sgttyb __user * sgttyb) |
| 498 | { |
| 499 | struct sgttyb tmp; |
| 500 | |
Arjan van de Ven | 5785c95 | 2006-09-29 02:00:43 -0700 | [diff] [blame] | 501 | mutex_lock(&tty->termios_mutex); |
Alan Cox | 606d099 | 2006-12-08 02:38:45 -0800 | [diff] [blame] | 502 | tmp.sg_ispeed = tty->termios->c_ispeed; |
| 503 | tmp.sg_ospeed = tty->termios->c_ospeed; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 504 | tmp.sg_erase = tty->termios->c_cc[VERASE]; |
| 505 | tmp.sg_kill = tty->termios->c_cc[VKILL]; |
| 506 | tmp.sg_flags = get_sgflags(tty); |
Arjan van de Ven | 5785c95 | 2006-09-29 02:00:43 -0700 | [diff] [blame] | 507 | mutex_unlock(&tty->termios_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 508 | |
| 509 | return copy_to_user(sgttyb, &tmp, sizeof(tmp)) ? -EFAULT : 0; |
| 510 | } |
| 511 | |
Alan Cox | edc6afc | 2006-12-08 02:38:44 -0800 | [diff] [blame] | 512 | static void set_sgflags(struct ktermios * termios, int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 513 | { |
| 514 | termios->c_iflag = ICRNL | IXON; |
| 515 | termios->c_oflag = 0; |
| 516 | termios->c_lflag = ISIG | ICANON; |
| 517 | if (flags & 0x02) { /* cbreak */ |
| 518 | termios->c_iflag = 0; |
| 519 | termios->c_lflag &= ~ICANON; |
| 520 | } |
| 521 | if (flags & 0x08) { /* echo */ |
| 522 | termios->c_lflag |= ECHO | ECHOE | ECHOK | |
| 523 | ECHOCTL | ECHOKE | IEXTEN; |
| 524 | } |
| 525 | if (flags & 0x10) { /* crmod */ |
| 526 | termios->c_oflag |= OPOST | ONLCR; |
| 527 | } |
| 528 | if (flags & 0x20) { /* raw */ |
| 529 | termios->c_iflag = 0; |
| 530 | termios->c_lflag &= ~(ISIG | ICANON); |
| 531 | } |
| 532 | if (!(termios->c_lflag & ICANON)) { |
| 533 | termios->c_cc[VMIN] = 1; |
| 534 | termios->c_cc[VTIME] = 0; |
| 535 | } |
| 536 | } |
| 537 | |
Alan Cox | af9b897 | 2006-08-27 01:24:01 -0700 | [diff] [blame] | 538 | /** |
| 539 | * set_sgttyb - set legacy terminal values |
| 540 | * @tty: tty structure |
| 541 | * @sgttyb: pointer to old style terminal structure |
| 542 | * |
| 543 | * Updates a terminal from the legacy BSD style terminal information |
| 544 | * structure. |
| 545 | * |
| 546 | * Locking: termios_sem |
| 547 | */ |
| 548 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 549 | static int set_sgttyb(struct tty_struct * tty, struct sgttyb __user * sgttyb) |
| 550 | { |
| 551 | int retval; |
| 552 | struct sgttyb tmp; |
Alan Cox | edc6afc | 2006-12-08 02:38:44 -0800 | [diff] [blame] | 553 | struct ktermios termios; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 554 | |
| 555 | retval = tty_check_change(tty); |
| 556 | if (retval) |
| 557 | return retval; |
| 558 | |
| 559 | if (copy_from_user(&tmp, sgttyb, sizeof(tmp))) |
| 560 | return -EFAULT; |
| 561 | |
Arjan van de Ven | 5785c95 | 2006-09-29 02:00:43 -0700 | [diff] [blame] | 562 | mutex_lock(&tty->termios_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 563 | termios = *tty->termios; |
| 564 | termios.c_cc[VERASE] = tmp.sg_erase; |
| 565 | termios.c_cc[VKILL] = tmp.sg_kill; |
| 566 | set_sgflags(&termios, tmp.sg_flags); |
Alan Cox | edc6afc | 2006-12-08 02:38:44 -0800 | [diff] [blame] | 567 | /* Try and encode into Bfoo format */ |
| 568 | #ifdef BOTHER |
| 569 | tty_termios_encode_baud_rate(&termios, termios.c_ispeed, termios.c_ospeed); |
| 570 | #endif |
Arjan van de Ven | 5785c95 | 2006-09-29 02:00:43 -0700 | [diff] [blame] | 571 | mutex_unlock(&tty->termios_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 572 | change_termios(tty, &termios); |
| 573 | return 0; |
| 574 | } |
| 575 | #endif |
| 576 | |
| 577 | #ifdef TIOCGETC |
| 578 | static int get_tchars(struct tty_struct * tty, struct tchars __user * tchars) |
| 579 | { |
| 580 | struct tchars tmp; |
| 581 | |
| 582 | tmp.t_intrc = tty->termios->c_cc[VINTR]; |
| 583 | tmp.t_quitc = tty->termios->c_cc[VQUIT]; |
| 584 | tmp.t_startc = tty->termios->c_cc[VSTART]; |
| 585 | tmp.t_stopc = tty->termios->c_cc[VSTOP]; |
| 586 | tmp.t_eofc = tty->termios->c_cc[VEOF]; |
| 587 | tmp.t_brkc = tty->termios->c_cc[VEOL2]; /* what is brkc anyway? */ |
| 588 | return copy_to_user(tchars, &tmp, sizeof(tmp)) ? -EFAULT : 0; |
| 589 | } |
| 590 | |
| 591 | static int set_tchars(struct tty_struct * tty, struct tchars __user * tchars) |
| 592 | { |
| 593 | struct tchars tmp; |
| 594 | |
| 595 | if (copy_from_user(&tmp, tchars, sizeof(tmp))) |
| 596 | return -EFAULT; |
| 597 | tty->termios->c_cc[VINTR] = tmp.t_intrc; |
| 598 | tty->termios->c_cc[VQUIT] = tmp.t_quitc; |
| 599 | tty->termios->c_cc[VSTART] = tmp.t_startc; |
| 600 | tty->termios->c_cc[VSTOP] = tmp.t_stopc; |
| 601 | tty->termios->c_cc[VEOF] = tmp.t_eofc; |
| 602 | tty->termios->c_cc[VEOL2] = tmp.t_brkc; /* what is brkc anyway? */ |
| 603 | return 0; |
| 604 | } |
| 605 | #endif |
| 606 | |
| 607 | #ifdef TIOCGLTC |
| 608 | static int get_ltchars(struct tty_struct * tty, struct ltchars __user * ltchars) |
| 609 | { |
| 610 | struct ltchars tmp; |
| 611 | |
| 612 | tmp.t_suspc = tty->termios->c_cc[VSUSP]; |
| 613 | tmp.t_dsuspc = tty->termios->c_cc[VSUSP]; /* what is dsuspc anyway? */ |
| 614 | tmp.t_rprntc = tty->termios->c_cc[VREPRINT]; |
| 615 | tmp.t_flushc = tty->termios->c_cc[VEOL2]; /* what is flushc anyway? */ |
| 616 | tmp.t_werasc = tty->termios->c_cc[VWERASE]; |
| 617 | tmp.t_lnextc = tty->termios->c_cc[VLNEXT]; |
| 618 | return copy_to_user(ltchars, &tmp, sizeof(tmp)) ? -EFAULT : 0; |
| 619 | } |
| 620 | |
| 621 | static int set_ltchars(struct tty_struct * tty, struct ltchars __user * ltchars) |
| 622 | { |
| 623 | struct ltchars tmp; |
| 624 | |
| 625 | if (copy_from_user(&tmp, ltchars, sizeof(tmp))) |
| 626 | return -EFAULT; |
| 627 | |
| 628 | tty->termios->c_cc[VSUSP] = tmp.t_suspc; |
| 629 | tty->termios->c_cc[VEOL2] = tmp.t_dsuspc; /* what is dsuspc anyway? */ |
| 630 | tty->termios->c_cc[VREPRINT] = tmp.t_rprntc; |
| 631 | tty->termios->c_cc[VEOL2] = tmp.t_flushc; /* what is flushc anyway? */ |
| 632 | tty->termios->c_cc[VWERASE] = tmp.t_werasc; |
| 633 | tty->termios->c_cc[VLNEXT] = tmp.t_lnextc; |
| 634 | return 0; |
| 635 | } |
| 636 | #endif |
| 637 | |
Alan Cox | af9b897 | 2006-08-27 01:24:01 -0700 | [diff] [blame] | 638 | /** |
| 639 | * send_prio_char - send priority character |
| 640 | * |
| 641 | * Send a high priority character to the tty even if stopped |
| 642 | * |
Alan Cox | 5f412b2 | 2006-09-29 02:01:40 -0700 | [diff] [blame] | 643 | * Locking: none for xchar method, write ordering for write method. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 644 | */ |
Alan Cox | af9b897 | 2006-08-27 01:24:01 -0700 | [diff] [blame] | 645 | |
Alan Cox | 5f412b2 | 2006-09-29 02:01:40 -0700 | [diff] [blame] | 646 | static int send_prio_char(struct tty_struct *tty, char ch) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 647 | { |
| 648 | int was_stopped = tty->stopped; |
| 649 | |
| 650 | if (tty->driver->send_xchar) { |
| 651 | tty->driver->send_xchar(tty, ch); |
Alan Cox | 5f412b2 | 2006-09-29 02:01:40 -0700 | [diff] [blame] | 652 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 653 | } |
Alan Cox | 5f412b2 | 2006-09-29 02:01:40 -0700 | [diff] [blame] | 654 | |
| 655 | if (mutex_lock_interruptible(&tty->atomic_write_lock)) |
| 656 | return -ERESTARTSYS; |
| 657 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 658 | if (was_stopped) |
| 659 | start_tty(tty); |
| 660 | tty->driver->write(tty, &ch, 1); |
| 661 | if (was_stopped) |
| 662 | stop_tty(tty); |
Alan Cox | 5f412b2 | 2006-09-29 02:01:40 -0700 | [diff] [blame] | 663 | mutex_unlock(&tty->atomic_write_lock); |
| 664 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 665 | } |
| 666 | |
| 667 | int n_tty_ioctl(struct tty_struct * tty, struct file * file, |
| 668 | unsigned int cmd, unsigned long arg) |
| 669 | { |
| 670 | struct tty_struct * real_tty; |
| 671 | void __user *p = (void __user *)arg; |
| 672 | int retval; |
| 673 | struct tty_ldisc *ld; |
| 674 | |
| 675 | if (tty->driver->type == TTY_DRIVER_TYPE_PTY && |
| 676 | tty->driver->subtype == PTY_TYPE_MASTER) |
| 677 | real_tty = tty->link; |
| 678 | else |
| 679 | real_tty = tty; |
| 680 | |
| 681 | switch (cmd) { |
| 682 | #ifdef TIOCGETP |
| 683 | case TIOCGETP: |
| 684 | return get_sgttyb(real_tty, (struct sgttyb __user *) arg); |
| 685 | case TIOCSETP: |
| 686 | case TIOCSETN: |
| 687 | return set_sgttyb(real_tty, (struct sgttyb __user *) arg); |
| 688 | #endif |
| 689 | #ifdef TIOCGETC |
| 690 | case TIOCGETC: |
| 691 | return get_tchars(real_tty, p); |
| 692 | case TIOCSETC: |
| 693 | return set_tchars(real_tty, p); |
| 694 | #endif |
| 695 | #ifdef TIOCGLTC |
| 696 | case TIOCGLTC: |
| 697 | return get_ltchars(real_tty, p); |
| 698 | case TIOCSLTC: |
| 699 | return set_ltchars(real_tty, p); |
| 700 | #endif |
Alan Cox | edc6afc | 2006-12-08 02:38:44 -0800 | [diff] [blame] | 701 | case TCSETSF: |
| 702 | return set_termios(real_tty, p, TERMIOS_FLUSH | TERMIOS_WAIT | TERMIOS_OLD); |
| 703 | case TCSETSW: |
| 704 | return set_termios(real_tty, p, TERMIOS_WAIT | TERMIOS_OLD); |
| 705 | case TCSETS: |
| 706 | return set_termios(real_tty, p, TERMIOS_OLD); |
| 707 | #ifndef TCGETS2 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 708 | case TCGETS: |
| 709 | if (kernel_termios_to_user_termios((struct termios __user *)arg, real_tty->termios)) |
| 710 | return -EFAULT; |
| 711 | return 0; |
Alan Cox | edc6afc | 2006-12-08 02:38:44 -0800 | [diff] [blame] | 712 | #else |
| 713 | case TCGETS: |
Alan Cox | 64bb6c5 | 2006-12-08 02:38:47 -0800 | [diff] [blame] | 714 | if (kernel_termios_to_user_termios_1((struct termios __user *)arg, real_tty->termios)) |
Alan Cox | edc6afc | 2006-12-08 02:38:44 -0800 | [diff] [blame] | 715 | return -EFAULT; |
| 716 | return 0; |
| 717 | case TCGETS2: |
Alan Cox | 64bb6c5 | 2006-12-08 02:38:47 -0800 | [diff] [blame] | 718 | if (kernel_termios_to_user_termios((struct termios2 __user *)arg, real_tty->termios)) |
Alan Cox | edc6afc | 2006-12-08 02:38:44 -0800 | [diff] [blame] | 719 | return -EFAULT; |
| 720 | return 0; |
| 721 | case TCSETSF2: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 722 | return set_termios(real_tty, p, TERMIOS_FLUSH | TERMIOS_WAIT); |
Alan Cox | edc6afc | 2006-12-08 02:38:44 -0800 | [diff] [blame] | 723 | case TCSETSW2: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 724 | return set_termios(real_tty, p, TERMIOS_WAIT); |
Alan Cox | edc6afc | 2006-12-08 02:38:44 -0800 | [diff] [blame] | 725 | case TCSETS2: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 726 | return set_termios(real_tty, p, 0); |
Alan Cox | edc6afc | 2006-12-08 02:38:44 -0800 | [diff] [blame] | 727 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 728 | case TCGETA: |
| 729 | return get_termio(real_tty, p); |
| 730 | case TCSETAF: |
| 731 | return set_termios(real_tty, p, TERMIOS_FLUSH | TERMIOS_WAIT | TERMIOS_TERMIO); |
| 732 | case TCSETAW: |
| 733 | return set_termios(real_tty, p, TERMIOS_WAIT | TERMIOS_TERMIO); |
| 734 | case TCSETA: |
| 735 | return set_termios(real_tty, p, TERMIOS_TERMIO); |
| 736 | case TCXONC: |
| 737 | retval = tty_check_change(tty); |
| 738 | if (retval) |
| 739 | return retval; |
| 740 | switch (arg) { |
| 741 | case TCOOFF: |
| 742 | if (!tty->flow_stopped) { |
| 743 | tty->flow_stopped = 1; |
| 744 | stop_tty(tty); |
| 745 | } |
| 746 | break; |
| 747 | case TCOON: |
| 748 | if (tty->flow_stopped) { |
| 749 | tty->flow_stopped = 0; |
| 750 | start_tty(tty); |
| 751 | } |
| 752 | break; |
| 753 | case TCIOFF: |
| 754 | if (STOP_CHAR(tty) != __DISABLED_CHAR) |
Alan Cox | 5f412b2 | 2006-09-29 02:01:40 -0700 | [diff] [blame] | 755 | return send_prio_char(tty, STOP_CHAR(tty)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 756 | break; |
| 757 | case TCION: |
| 758 | if (START_CHAR(tty) != __DISABLED_CHAR) |
Alan Cox | 5f412b2 | 2006-09-29 02:01:40 -0700 | [diff] [blame] | 759 | return send_prio_char(tty, START_CHAR(tty)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 760 | break; |
| 761 | default: |
| 762 | return -EINVAL; |
| 763 | } |
| 764 | return 0; |
| 765 | case TCFLSH: |
| 766 | retval = tty_check_change(tty); |
| 767 | if (retval) |
| 768 | return retval; |
| 769 | |
| 770 | ld = tty_ldisc_ref(tty); |
| 771 | switch (arg) { |
| 772 | case TCIFLUSH: |
KAMBAROV, ZAUR | 69f63c5 | 2005-06-28 20:45:12 -0700 | [diff] [blame] | 773 | if (ld && ld->flush_buffer) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 774 | ld->flush_buffer(tty); |
| 775 | break; |
| 776 | case TCIOFLUSH: |
KAMBAROV, ZAUR | 69f63c5 | 2005-06-28 20:45:12 -0700 | [diff] [blame] | 777 | if (ld && ld->flush_buffer) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 778 | ld->flush_buffer(tty); |
| 779 | /* fall through */ |
| 780 | case TCOFLUSH: |
| 781 | if (tty->driver->flush_buffer) |
| 782 | tty->driver->flush_buffer(tty); |
| 783 | break; |
| 784 | default: |
| 785 | tty_ldisc_deref(ld); |
| 786 | return -EINVAL; |
| 787 | } |
| 788 | tty_ldisc_deref(ld); |
| 789 | return 0; |
| 790 | case TIOCOUTQ: |
| 791 | return put_user(tty->driver->chars_in_buffer ? |
| 792 | tty->driver->chars_in_buffer(tty) : 0, |
| 793 | (int __user *) arg); |
| 794 | case TIOCINQ: |
| 795 | retval = tty->read_cnt; |
| 796 | if (L_ICANON(tty)) |
| 797 | retval = inq_canon(tty); |
| 798 | return put_user(retval, (unsigned int __user *) arg); |
| 799 | case TIOCGLCKTRMIOS: |
| 800 | if (kernel_termios_to_user_termios((struct termios __user *)arg, real_tty->termios_locked)) |
| 801 | return -EFAULT; |
| 802 | return 0; |
| 803 | |
| 804 | case TIOCSLCKTRMIOS: |
| 805 | if (!capable(CAP_SYS_ADMIN)) |
| 806 | return -EPERM; |
| 807 | if (user_termios_to_kernel_termios(real_tty->termios_locked, (struct termios __user *) arg)) |
| 808 | return -EFAULT; |
| 809 | return 0; |
| 810 | |
| 811 | case TIOCPKT: |
| 812 | { |
| 813 | int pktmode; |
| 814 | |
| 815 | if (tty->driver->type != TTY_DRIVER_TYPE_PTY || |
| 816 | tty->driver->subtype != PTY_TYPE_MASTER) |
| 817 | return -ENOTTY; |
| 818 | if (get_user(pktmode, (int __user *) arg)) |
| 819 | return -EFAULT; |
| 820 | if (pktmode) { |
| 821 | if (!tty->packet) { |
| 822 | tty->packet = 1; |
| 823 | tty->link->ctrl_status = 0; |
| 824 | } |
| 825 | } else |
| 826 | tty->packet = 0; |
| 827 | return 0; |
| 828 | } |
| 829 | case TIOCGSOFTCAR: |
| 830 | return put_user(C_CLOCAL(tty) ? 1 : 0, (int __user *)arg); |
| 831 | case TIOCSSOFTCAR: |
| 832 | if (get_user(arg, (unsigned int __user *) arg)) |
| 833 | return -EFAULT; |
Arjan van de Ven | 5785c95 | 2006-09-29 02:00:43 -0700 | [diff] [blame] | 834 | mutex_lock(&tty->termios_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 835 | tty->termios->c_cflag = |
| 836 | ((tty->termios->c_cflag & ~CLOCAL) | |
| 837 | (arg ? CLOCAL : 0)); |
Arjan van de Ven | 5785c95 | 2006-09-29 02:00:43 -0700 | [diff] [blame] | 838 | mutex_unlock(&tty->termios_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 839 | return 0; |
| 840 | default: |
| 841 | return -ENOIOCTLCMD; |
| 842 | } |
| 843 | } |
| 844 | |
| 845 | EXPORT_SYMBOL(n_tty_ioctl); |