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 | |
Alan Cox | 355d95a | 2008-02-08 04:18:48 -0800 | [diff] [blame] | 53 | void tty_wait_until_sent(struct tty_struct *tty, long timeout) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 54 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 55 | #ifdef TTY_DEBUG_WAIT_UNTIL_SENT |
| 56 | char buf[64]; |
Alan Cox | 355d95a | 2008-02-08 04:18:48 -0800 | [diff] [blame] | 57 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 58 | printk(KERN_DEBUG "%s wait until sent...\n", tty_name(tty, buf)); |
| 59 | #endif |
| 60 | if (!tty->driver->chars_in_buffer) |
| 61 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 62 | if (!timeout) |
| 63 | timeout = MAX_SCHEDULE_TIMEOUT; |
Jiri Slaby | 5a52bd4 | 2007-07-15 23:40:18 -0700 | [diff] [blame] | 64 | if (wait_event_interruptible_timeout(tty->write_wait, |
Cory T. Tusar | db99247 | 2007-12-23 12:34:51 -0800 | [diff] [blame] | 65 | !tty->driver->chars_in_buffer(tty), timeout) < 0) |
Jiri Slaby | 5a52bd4 | 2007-07-15 23:40:18 -0700 | [diff] [blame] | 66 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 67 | if (tty->driver->wait_until_sent) |
| 68 | tty->driver->wait_until_sent(tty, timeout); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 69 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 70 | EXPORT_SYMBOL(tty_wait_until_sent); |
| 71 | |
Alan Cox | edc6afc | 2006-12-08 02:38:44 -0800 | [diff] [blame] | 72 | static void unset_locked_termios(struct ktermios *termios, |
| 73 | struct ktermios *old, |
| 74 | struct ktermios *locked) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 75 | { |
| 76 | int i; |
Alan Cox | 355d95a | 2008-02-08 04:18:48 -0800 | [diff] [blame] | 77 | |
| 78 | #define NOSET_MASK(x, y, z) (x = ((x) & ~(z)) | ((y) & (z))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 79 | |
| 80 | if (!locked) { |
| 81 | printk(KERN_WARNING "Warning?!? termios_locked is NULL.\n"); |
| 82 | return; |
| 83 | } |
| 84 | |
| 85 | NOSET_MASK(termios->c_iflag, old->c_iflag, locked->c_iflag); |
| 86 | NOSET_MASK(termios->c_oflag, old->c_oflag, locked->c_oflag); |
| 87 | NOSET_MASK(termios->c_cflag, old->c_cflag, locked->c_cflag); |
| 88 | NOSET_MASK(termios->c_lflag, old->c_lflag, locked->c_lflag); |
| 89 | termios->c_line = locked->c_line ? old->c_line : termios->c_line; |
Alan Cox | 355d95a | 2008-02-08 04:18:48 -0800 | [diff] [blame] | 90 | for (i = 0; i < NCCS; i++) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 91 | termios->c_cc[i] = locked->c_cc[i] ? |
| 92 | old->c_cc[i] : termios->c_cc[i]; |
Alan Cox | edc6afc | 2006-12-08 02:38:44 -0800 | [diff] [blame] | 93 | /* FIXME: What should we do for i/ospeed */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 94 | } |
| 95 | |
Alan Cox | edc6afc | 2006-12-08 02:38:44 -0800 | [diff] [blame] | 96 | /* |
| 97 | * Routine which returns the baud rate of the tty |
| 98 | * |
| 99 | * Note that the baud_table needs to be kept in sync with the |
| 100 | * include/asm/termbits.h file. |
| 101 | */ |
| 102 | static const speed_t baud_table[] = { |
| 103 | 0, 50, 75, 110, 134, 150, 200, 300, 600, 1200, 1800, 2400, 4800, |
| 104 | 9600, 19200, 38400, 57600, 115200, 230400, 460800, |
| 105 | #ifdef __sparc__ |
| 106 | 76800, 153600, 307200, 614400, 921600 |
| 107 | #else |
| 108 | 500000, 576000, 921600, 1000000, 1152000, 1500000, 2000000, |
| 109 | 2500000, 3000000, 3500000, 4000000 |
| 110 | #endif |
| 111 | }; |
| 112 | |
| 113 | #ifndef __sparc__ |
| 114 | static const tcflag_t baud_bits[] = { |
| 115 | B0, B50, B75, B110, B134, B150, B200, B300, B600, |
| 116 | B1200, B1800, B2400, B4800, B9600, B19200, B38400, |
| 117 | B57600, B115200, B230400, B460800, B500000, B576000, |
| 118 | B921600, B1000000, B1152000, B1500000, B2000000, B2500000, |
| 119 | B3000000, B3500000, B4000000 |
| 120 | }; |
| 121 | #else |
| 122 | static const tcflag_t baud_bits[] = { |
| 123 | B0, B50, B75, B110, B134, B150, B200, B300, B600, |
| 124 | B1200, B1800, B2400, B4800, B9600, B19200, B38400, |
| 125 | B57600, B115200, B230400, B460800, B76800, B153600, |
| 126 | B307200, B614400, B921600 |
| 127 | }; |
| 128 | #endif |
| 129 | |
| 130 | static int n_baud_table = ARRAY_SIZE(baud_table); |
| 131 | |
| 132 | /** |
| 133 | * tty_termios_baud_rate |
| 134 | * @termios: termios structure |
| 135 | * |
| 136 | * Convert termios baud rate data into a speed. This should be called |
| 137 | * with the termios lock held if this termios is a terminal termios |
| 138 | * structure. May change the termios data. Device drivers can call this |
| 139 | * function but should use ->c_[io]speed directly as they are updated. |
| 140 | * |
| 141 | * Locking: none |
| 142 | */ |
| 143 | |
| 144 | speed_t tty_termios_baud_rate(struct ktermios *termios) |
| 145 | { |
| 146 | unsigned int cbaud; |
| 147 | |
| 148 | cbaud = termios->c_cflag & CBAUD; |
| 149 | |
| 150 | #ifdef BOTHER |
| 151 | /* Magic token for arbitary speed via c_ispeed/c_ospeed */ |
| 152 | if (cbaud == BOTHER) |
| 153 | return termios->c_ospeed; |
| 154 | #endif |
| 155 | if (cbaud & CBAUDEX) { |
| 156 | cbaud &= ~CBAUDEX; |
| 157 | |
| 158 | if (cbaud < 1 || cbaud + 15 > n_baud_table) |
| 159 | termios->c_cflag &= ~CBAUDEX; |
| 160 | else |
| 161 | cbaud += 15; |
| 162 | } |
| 163 | return baud_table[cbaud]; |
| 164 | } |
Alan Cox | edc6afc | 2006-12-08 02:38:44 -0800 | [diff] [blame] | 165 | EXPORT_SYMBOL(tty_termios_baud_rate); |
| 166 | |
| 167 | /** |
| 168 | * tty_termios_input_baud_rate |
| 169 | * @termios: termios structure |
| 170 | * |
| 171 | * Convert termios baud rate data into a speed. This should be called |
| 172 | * with the termios lock held if this termios is a terminal termios |
| 173 | * structure. May change the termios data. Device drivers can call this |
| 174 | * function but should use ->c_[io]speed directly as they are updated. |
| 175 | * |
| 176 | * Locking: none |
| 177 | */ |
| 178 | |
| 179 | speed_t tty_termios_input_baud_rate(struct ktermios *termios) |
| 180 | { |
| 181 | #ifdef IBSHIFT |
| 182 | unsigned int cbaud = (termios->c_cflag >> IBSHIFT) & CBAUD; |
| 183 | |
| 184 | if (cbaud == B0) |
| 185 | return tty_termios_baud_rate(termios); |
| 186 | |
| 187 | /* Magic token for arbitary speed via c_ispeed*/ |
| 188 | if (cbaud == BOTHER) |
| 189 | return termios->c_ispeed; |
| 190 | |
| 191 | if (cbaud & CBAUDEX) { |
| 192 | cbaud &= ~CBAUDEX; |
| 193 | |
| 194 | if (cbaud < 1 || cbaud + 15 > n_baud_table) |
| 195 | termios->c_cflag &= ~(CBAUDEX << IBSHIFT); |
| 196 | else |
| 197 | cbaud += 15; |
| 198 | } |
| 199 | return baud_table[cbaud]; |
| 200 | #else |
| 201 | return tty_termios_baud_rate(termios); |
| 202 | #endif |
| 203 | } |
Alan Cox | edc6afc | 2006-12-08 02:38:44 -0800 | [diff] [blame] | 204 | EXPORT_SYMBOL(tty_termios_input_baud_rate); |
| 205 | |
Alan Cox | edc6afc | 2006-12-08 02:38:44 -0800 | [diff] [blame] | 206 | /** |
| 207 | * tty_termios_encode_baud_rate |
Alan Cox | 78137e3 | 2007-02-10 01:45:57 -0800 | [diff] [blame] | 208 | * @termios: ktermios structure holding user requested state |
Alan Cox | edc6afc | 2006-12-08 02:38:44 -0800 | [diff] [blame] | 209 | * @ispeed: input speed |
| 210 | * @ospeed: output speed |
| 211 | * |
| 212 | * Encode the speeds set into the passed termios structure. This is |
| 213 | * used as a library helper for drivers os that they can report back |
| 214 | * the actual speed selected when it differs from the speed requested |
| 215 | * |
Alan Cox | 78137e3 | 2007-02-10 01:45:57 -0800 | [diff] [blame] | 216 | * For maximal back compatibility with legacy SYS5/POSIX *nix behaviour |
| 217 | * we need to carefully set the bits when the user does not get the |
| 218 | * desired speed. We allow small margins and preserve as much of possible |
| 219 | * of the input intent to keep compatiblity. |
Alan Cox | edc6afc | 2006-12-08 02:38:44 -0800 | [diff] [blame] | 220 | * |
| 221 | * Locking: Caller should hold termios lock. This is already held |
| 222 | * when calling this function from the driver termios handler. |
Alan Cox | 5f519d7 | 2007-10-16 23:30:07 -0700 | [diff] [blame] | 223 | * |
| 224 | * The ifdefs deal with platforms whose owners have yet to update them |
| 225 | * and will all go away once this is done. |
Alan Cox | edc6afc | 2006-12-08 02:38:44 -0800 | [diff] [blame] | 226 | */ |
| 227 | |
Maciej W. Rozycki | 75e8b71 | 2007-10-18 03:04:35 -0700 | [diff] [blame] | 228 | void tty_termios_encode_baud_rate(struct ktermios *termios, |
| 229 | speed_t ibaud, speed_t obaud) |
Alan Cox | edc6afc | 2006-12-08 02:38:44 -0800 | [diff] [blame] | 230 | { |
| 231 | int i = 0; |
Alan Cox | 78137e3 | 2007-02-10 01:45:57 -0800 | [diff] [blame] | 232 | int ifound = -1, ofound = -1; |
| 233 | int iclose = ibaud/50, oclose = obaud/50; |
| 234 | int ibinput = 0; |
Alan Cox | edc6afc | 2006-12-08 02:38:44 -0800 | [diff] [blame] | 235 | |
Alan Cox | 5f519d7 | 2007-10-16 23:30:07 -0700 | [diff] [blame] | 236 | if (obaud == 0) /* CD dropped */ |
| 237 | ibaud = 0; /* Clear ibaud to be sure */ |
| 238 | |
Alan Cox | edc6afc | 2006-12-08 02:38:44 -0800 | [diff] [blame] | 239 | termios->c_ispeed = ibaud; |
| 240 | termios->c_ospeed = obaud; |
| 241 | |
Alan Cox | 5f519d7 | 2007-10-16 23:30:07 -0700 | [diff] [blame] | 242 | #ifdef BOTHER |
Alan Cox | 78137e3 | 2007-02-10 01:45:57 -0800 | [diff] [blame] | 243 | /* If the user asked for a precise weird speed give a precise weird |
| 244 | answer. If they asked for a Bfoo speed they many have problems |
| 245 | digesting non-exact replies so fuzz a bit */ |
| 246 | |
| 247 | if ((termios->c_cflag & CBAUD) == BOTHER) |
| 248 | oclose = 0; |
| 249 | if (((termios->c_cflag >> IBSHIFT) & CBAUD) == BOTHER) |
| 250 | iclose = 0; |
| 251 | if ((termios->c_cflag >> IBSHIFT) & CBAUD) |
| 252 | ibinput = 1; /* An input speed was specified */ |
Alan Cox | 5f519d7 | 2007-10-16 23:30:07 -0700 | [diff] [blame] | 253 | #endif |
Alan Cox | edc6afc | 2006-12-08 02:38:44 -0800 | [diff] [blame] | 254 | termios->c_cflag &= ~CBAUD; |
Alan Cox | edc6afc | 2006-12-08 02:38:44 -0800 | [diff] [blame] | 255 | |
Alan Cox | 5f519d7 | 2007-10-16 23:30:07 -0700 | [diff] [blame] | 256 | /* |
| 257 | * Our goal is to find a close match to the standard baud rate |
| 258 | * returned. Walk the baud rate table and if we get a very close |
| 259 | * match then report back the speed as a POSIX Bxxxx value by |
| 260 | * preference |
| 261 | */ |
| 262 | |
Alan Cox | edc6afc | 2006-12-08 02:38:44 -0800 | [diff] [blame] | 263 | do { |
Maciej W. Rozycki | 75e8b71 | 2007-10-18 03:04:35 -0700 | [diff] [blame] | 264 | if (obaud - oclose <= baud_table[i] && |
| 265 | obaud + oclose >= baud_table[i]) { |
Alan Cox | edc6afc | 2006-12-08 02:38:44 -0800 | [diff] [blame] | 266 | termios->c_cflag |= baud_bits[i]; |
Alan Cox | 78137e3 | 2007-02-10 01:45:57 -0800 | [diff] [blame] | 267 | ofound = i; |
Alan Cox | edc6afc | 2006-12-08 02:38:44 -0800 | [diff] [blame] | 268 | } |
Maciej W. Rozycki | 75e8b71 | 2007-10-18 03:04:35 -0700 | [diff] [blame] | 269 | if (ibaud - iclose <= baud_table[i] && |
| 270 | ibaud + iclose >= baud_table[i]) { |
| 271 | /* For the case input == output don't set IBAUD bits |
| 272 | if the user didn't do so */ |
Alan Cox | 5f519d7 | 2007-10-16 23:30:07 -0700 | [diff] [blame] | 273 | if (ofound == i && !ibinput) |
| 274 | ifound = i; |
| 275 | #ifdef IBSHIFT |
| 276 | else { |
| 277 | ifound = i; |
Alan Cox | 78137e3 | 2007-02-10 01:45:57 -0800 | [diff] [blame] | 278 | termios->c_cflag |= (baud_bits[i] << IBSHIFT); |
Alan Cox | 5f519d7 | 2007-10-16 23:30:07 -0700 | [diff] [blame] | 279 | } |
| 280 | #endif |
Alan Cox | edc6afc | 2006-12-08 02:38:44 -0800 | [diff] [blame] | 281 | } |
Jiri Slaby | 6804396 | 2007-07-15 23:40:18 -0700 | [diff] [blame] | 282 | } while (++i < n_baud_table); |
Alan Cox | 5f519d7 | 2007-10-16 23:30:07 -0700 | [diff] [blame] | 283 | |
| 284 | /* |
| 285 | * If we found no match then use BOTHER if provided or warn |
| 286 | * the user their platform maintainer needs to wake up if not. |
| 287 | */ |
| 288 | #ifdef BOTHER |
Alan Cox | 78137e3 | 2007-02-10 01:45:57 -0800 | [diff] [blame] | 289 | if (ofound == -1) |
Alan Cox | edc6afc | 2006-12-08 02:38:44 -0800 | [diff] [blame] | 290 | termios->c_cflag |= BOTHER; |
Alan Cox | 78137e3 | 2007-02-10 01:45:57 -0800 | [diff] [blame] | 291 | /* Set exact input bits only if the input and output differ or the |
| 292 | user already did */ |
Jiri Slaby | 6804396 | 2007-07-15 23:40:18 -0700 | [diff] [blame] | 293 | if (ifound == -1 && (ibaud != obaud || ibinput)) |
Alan Cox | edc6afc | 2006-12-08 02:38:44 -0800 | [diff] [blame] | 294 | termios->c_cflag |= (BOTHER << IBSHIFT); |
Alan Cox | 5f519d7 | 2007-10-16 23:30:07 -0700 | [diff] [blame] | 295 | #else |
| 296 | if (ifound == -1 || ofound == -1) { |
| 297 | static int warned; |
| 298 | if (!warned++) |
| 299 | printk(KERN_WARNING "tty: Unable to return correct " |
| 300 | "speed data as your architecture needs updating.\n"); |
| 301 | } |
| 302 | #endif |
Alan Cox | edc6afc | 2006-12-08 02:38:44 -0800 | [diff] [blame] | 303 | } |
Alan Cox | edc6afc | 2006-12-08 02:38:44 -0800 | [diff] [blame] | 304 | EXPORT_SYMBOL_GPL(tty_termios_encode_baud_rate); |
| 305 | |
Alan Cox | 5f519d7 | 2007-10-16 23:30:07 -0700 | [diff] [blame] | 306 | void tty_encode_baud_rate(struct tty_struct *tty, speed_t ibaud, speed_t obaud) |
| 307 | { |
| 308 | tty_termios_encode_baud_rate(tty->termios, ibaud, obaud); |
| 309 | } |
| 310 | EXPORT_SYMBOL_GPL(tty_encode_baud_rate); |
Alan Cox | edc6afc | 2006-12-08 02:38:44 -0800 | [diff] [blame] | 311 | |
| 312 | /** |
| 313 | * tty_get_baud_rate - get tty bit rates |
| 314 | * @tty: tty to query |
| 315 | * |
| 316 | * Returns the baud rate as an integer for this terminal. The |
| 317 | * termios lock must be held by the caller and the terminal bit |
| 318 | * flags may be updated. |
| 319 | * |
| 320 | * Locking: none |
| 321 | */ |
| 322 | |
| 323 | speed_t tty_get_baud_rate(struct tty_struct *tty) |
| 324 | { |
| 325 | speed_t baud = tty_termios_baud_rate(tty->termios); |
| 326 | |
| 327 | if (baud == 38400 && tty->alt_speed) { |
| 328 | if (!tty->warned) { |
| 329 | printk(KERN_WARNING "Use of setserial/setrocket to " |
| 330 | "set SPD_* flags is deprecated\n"); |
| 331 | tty->warned = 1; |
| 332 | } |
| 333 | baud = tty->alt_speed; |
| 334 | } |
| 335 | |
| 336 | return baud; |
| 337 | } |
Alan Cox | edc6afc | 2006-12-08 02:38:44 -0800 | [diff] [blame] | 338 | EXPORT_SYMBOL(tty_get_baud_rate); |
| 339 | |
Alan Cox | af9b897 | 2006-08-27 01:24:01 -0700 | [diff] [blame] | 340 | /** |
Alan Cox | 5f519d7 | 2007-10-16 23:30:07 -0700 | [diff] [blame] | 341 | * tty_termios_copy_hw - copy hardware settings |
| 342 | * @new: New termios |
| 343 | * @old: Old termios |
| 344 | * |
| 345 | * Propogate the hardware specific terminal setting bits from |
| 346 | * the old termios structure to the new one. This is used in cases |
| 347 | * where the hardware does not support reconfiguration or as a helper |
| 348 | * in some cases where only minimal reconfiguration is supported |
| 349 | */ |
| 350 | |
| 351 | void tty_termios_copy_hw(struct ktermios *new, struct ktermios *old) |
| 352 | { |
| 353 | /* The bits a dumb device handles in software. Smart devices need |
| 354 | to always provide a set_termios method */ |
| 355 | new->c_cflag &= HUPCL | CREAD | CLOCAL; |
| 356 | new->c_cflag |= old->c_cflag & ~(HUPCL | CREAD | CLOCAL); |
| 357 | new->c_ispeed = old->c_ispeed; |
| 358 | new->c_ospeed = old->c_ospeed; |
| 359 | } |
Alan Cox | 5f519d7 | 2007-10-16 23:30:07 -0700 | [diff] [blame] | 360 | EXPORT_SYMBOL(tty_termios_copy_hw); |
| 361 | |
| 362 | /** |
Alan Cox | bf5e583 | 2008-01-08 14:55:51 +0000 | [diff] [blame] | 363 | * tty_termios_hw_change - check for setting change |
| 364 | * @a: termios |
| 365 | * @b: termios to compare |
| 366 | * |
| 367 | * Check if any of the bits that affect a dumb device have changed |
| 368 | * between the two termios structures, or a speed change is needed. |
| 369 | */ |
| 370 | |
| 371 | int tty_termios_hw_change(struct ktermios *a, struct ktermios *b) |
| 372 | { |
| 373 | if (a->c_ispeed != b->c_ispeed || a->c_ospeed != b->c_ospeed) |
| 374 | return 1; |
| 375 | if ((a->c_cflag ^ b->c_cflag) & ~(HUPCL | CREAD | CLOCAL)) |
| 376 | return 1; |
| 377 | return 0; |
| 378 | } |
| 379 | EXPORT_SYMBOL(tty_termios_hw_change); |
| 380 | |
| 381 | /** |
Alan Cox | af9b897 | 2006-08-27 01:24:01 -0700 | [diff] [blame] | 382 | * change_termios - update termios values |
| 383 | * @tty: tty to update |
| 384 | * @new_termios: desired new value |
| 385 | * |
| 386 | * Perform updates to the termios values set on this terminal. There |
| 387 | * is a bit of layering violation here with n_tty in terms of the |
| 388 | * internal knowledge of this function. |
| 389 | * |
| 390 | * Locking: termios_sem |
| 391 | */ |
| 392 | |
Alan Cox | 355d95a | 2008-02-08 04:18:48 -0800 | [diff] [blame] | 393 | static void change_termios(struct tty_struct *tty, struct ktermios *new_termios) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 394 | { |
| 395 | int canon_change; |
Alan Cox | edc6afc | 2006-12-08 02:38:44 -0800 | [diff] [blame] | 396 | struct ktermios old_termios = *tty->termios; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 397 | struct tty_ldisc *ld; |
Alan Cox | 355d95a | 2008-02-08 04:18:48 -0800 | [diff] [blame] | 398 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 399 | /* |
| 400 | * Perform the actual termios internal changes under lock. |
| 401 | */ |
Alan Cox | 355d95a | 2008-02-08 04:18:48 -0800 | [diff] [blame] | 402 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 403 | |
| 404 | /* FIXME: we need to decide on some locking/ordering semantics |
| 405 | for the set_termios notification eventually */ |
Arjan van de Ven | 5785c95 | 2006-09-29 02:00:43 -0700 | [diff] [blame] | 406 | mutex_lock(&tty->termios_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 407 | |
| 408 | *tty->termios = *new_termios; |
| 409 | unset_locked_termios(tty->termios, &old_termios, tty->termios_locked); |
| 410 | canon_change = (old_termios.c_lflag ^ tty->termios->c_lflag) & ICANON; |
| 411 | if (canon_change) { |
| 412 | memset(&tty->read_flags, 0, sizeof tty->read_flags); |
| 413 | tty->canon_head = tty->read_tail; |
| 414 | tty->canon_data = 0; |
| 415 | tty->erasing = 0; |
| 416 | } |
Alan Cox | 355d95a | 2008-02-08 04:18:48 -0800 | [diff] [blame] | 417 | |
Alan Cox | 5f519d7 | 2007-10-16 23:30:07 -0700 | [diff] [blame] | 418 | /* This bit should be in the ldisc code */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 419 | if (canon_change && !L_ICANON(tty) && tty->read_cnt) |
| 420 | /* Get characters left over from canonical mode. */ |
| 421 | wake_up_interruptible(&tty->read_wait); |
| 422 | |
| 423 | /* See if packet mode change of state. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 424 | if (tty->link && tty->link->packet) { |
| 425 | int old_flow = ((old_termios.c_iflag & IXON) && |
| 426 | (old_termios.c_cc[VSTOP] == '\023') && |
| 427 | (old_termios.c_cc[VSTART] == '\021')); |
| 428 | int new_flow = (I_IXON(tty) && |
| 429 | STOP_CHAR(tty) == '\023' && |
| 430 | START_CHAR(tty) == '\021'); |
| 431 | if (old_flow != new_flow) { |
| 432 | tty->ctrl_status &= ~(TIOCPKT_DOSTOP | TIOCPKT_NOSTOP); |
| 433 | if (new_flow) |
| 434 | tty->ctrl_status |= TIOCPKT_DOSTOP; |
| 435 | else |
| 436 | tty->ctrl_status |= TIOCPKT_NOSTOP; |
| 437 | wake_up_interruptible(&tty->link->read_wait); |
| 438 | } |
| 439 | } |
Alan Cox | 355d95a | 2008-02-08 04:18:48 -0800 | [diff] [blame] | 440 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 441 | if (tty->driver->set_termios) |
| 442 | (*tty->driver->set_termios)(tty, &old_termios); |
Alan Cox | 5f519d7 | 2007-10-16 23:30:07 -0700 | [diff] [blame] | 443 | else |
| 444 | tty_termios_copy_hw(tty->termios, &old_termios); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 445 | |
| 446 | ld = tty_ldisc_ref(tty); |
| 447 | if (ld != NULL) { |
| 448 | if (ld->set_termios) |
| 449 | (ld->set_termios)(tty, &old_termios); |
| 450 | tty_ldisc_deref(ld); |
| 451 | } |
Arjan van de Ven | 5785c95 | 2006-09-29 02:00:43 -0700 | [diff] [blame] | 452 | mutex_unlock(&tty->termios_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 453 | } |
| 454 | |
Alan Cox | af9b897 | 2006-08-27 01:24:01 -0700 | [diff] [blame] | 455 | /** |
| 456 | * set_termios - set termios values for a tty |
| 457 | * @tty: terminal device |
| 458 | * @arg: user data |
| 459 | * @opt: option information |
| 460 | * |
Robert P. J. Day | 3a4fa0a | 2007-10-19 23:10:43 +0200 | [diff] [blame] | 461 | * Helper function to prepare termios data and run necessary other |
Alan Cox | af9b897 | 2006-08-27 01:24:01 -0700 | [diff] [blame] | 462 | * functions before using change_termios to do the actual changes. |
| 463 | * |
| 464 | * Locking: |
| 465 | * Called functions take ldisc and termios_sem locks |
| 466 | */ |
| 467 | |
Alan Cox | 355d95a | 2008-02-08 04:18:48 -0800 | [diff] [blame] | 468 | static int set_termios(struct tty_struct *tty, void __user *arg, int opt) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 469 | { |
Alan Cox | edc6afc | 2006-12-08 02:38:44 -0800 | [diff] [blame] | 470 | struct ktermios tmp_termios; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 471 | struct tty_ldisc *ld; |
| 472 | int retval = tty_check_change(tty); |
| 473 | |
| 474 | if (retval) |
| 475 | return retval; |
| 476 | |
Alan Cox | 64bb6c5 | 2006-12-08 02:38:47 -0800 | [diff] [blame] | 477 | memcpy(&tmp_termios, tty->termios, sizeof(struct ktermios)); |
| 478 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 479 | if (opt & TERMIOS_TERMIO) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 480 | if (user_termio_to_kernel_termios(&tmp_termios, |
| 481 | (struct termio __user *)arg)) |
| 482 | return -EFAULT; |
Alan Cox | edc6afc | 2006-12-08 02:38:44 -0800 | [diff] [blame] | 483 | #ifdef TCGETS2 |
| 484 | } else if (opt & TERMIOS_OLD) { |
Alan Cox | edc6afc | 2006-12-08 02:38:44 -0800 | [diff] [blame] | 485 | if (user_termios_to_kernel_termios_1(&tmp_termios, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 486 | (struct termios __user *)arg)) |
| 487 | return -EFAULT; |
Alan Cox | 64bb6c5 | 2006-12-08 02:38:47 -0800 | [diff] [blame] | 488 | } else { |
| 489 | if (user_termios_to_kernel_termios(&tmp_termios, |
| 490 | (struct termios2 __user *)arg)) |
| 491 | return -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 492 | } |
Alan Cox | 64bb6c5 | 2006-12-08 02:38:47 -0800 | [diff] [blame] | 493 | #else |
| 494 | } else if (user_termios_to_kernel_termios(&tmp_termios, |
| 495 | (struct termios __user *)arg)) |
| 496 | return -EFAULT; |
| 497 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 498 | |
Alan Cox | 355d95a | 2008-02-08 04:18:48 -0800 | [diff] [blame] | 499 | /* If old style Bfoo values are used then load c_ispeed/c_ospeed |
| 500 | * with the real speed so its unconditionally usable */ |
Alan Cox | edc6afc | 2006-12-08 02:38:44 -0800 | [diff] [blame] | 501 | tmp_termios.c_ispeed = tty_termios_input_baud_rate(&tmp_termios); |
| 502 | tmp_termios.c_ospeed = tty_termios_baud_rate(&tmp_termios); |
| 503 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 504 | ld = tty_ldisc_ref(tty); |
Alan Cox | 355d95a | 2008-02-08 04:18:48 -0800 | [diff] [blame] | 505 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 506 | if (ld != NULL) { |
| 507 | if ((opt & TERMIOS_FLUSH) && ld->flush_buffer) |
| 508 | ld->flush_buffer(tty); |
| 509 | tty_ldisc_deref(ld); |
| 510 | } |
Alan Cox | 355d95a | 2008-02-08 04:18:48 -0800 | [diff] [blame] | 511 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 512 | if (opt & TERMIOS_WAIT) { |
| 513 | tty_wait_until_sent(tty, 0); |
| 514 | if (signal_pending(current)) |
| 515 | return -EINTR; |
| 516 | } |
| 517 | |
| 518 | change_termios(tty, &tmp_termios); |
Alan Cox | 5f519d7 | 2007-10-16 23:30:07 -0700 | [diff] [blame] | 519 | |
| 520 | /* FIXME: Arguably if tmp_termios == tty->termios AND the |
| 521 | actual requested termios was not tmp_termios then we may |
| 522 | want to return an error as no user requested change has |
| 523 | succeeded */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 524 | return 0; |
| 525 | } |
| 526 | |
Alan Cox | 355d95a | 2008-02-08 04:18:48 -0800 | [diff] [blame] | 527 | static int get_termio(struct tty_struct *tty, struct termio __user *termio) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 528 | { |
| 529 | if (kernel_termios_to_user_termio(termio, tty->termios)) |
| 530 | return -EFAULT; |
| 531 | return 0; |
| 532 | } |
| 533 | |
Alan Cox | 355d95a | 2008-02-08 04:18:48 -0800 | [diff] [blame] | 534 | static unsigned long inq_canon(struct tty_struct *tty) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 535 | { |
| 536 | int nr, head, tail; |
| 537 | |
| 538 | if (!tty->canon_data || !tty->read_buf) |
| 539 | return 0; |
| 540 | head = tty->canon_head; |
| 541 | tail = tty->read_tail; |
| 542 | nr = (head - tail) & (N_TTY_BUF_SIZE-1); |
| 543 | /* Skip EOF-chars.. */ |
| 544 | while (head != tail) { |
| 545 | if (test_bit(tail, tty->read_flags) && |
| 546 | tty->read_buf[tail] == __DISABLED_CHAR) |
| 547 | nr--; |
| 548 | tail = (tail+1) & (N_TTY_BUF_SIZE-1); |
| 549 | } |
| 550 | return nr; |
| 551 | } |
| 552 | |
| 553 | #ifdef TIOCGETP |
| 554 | /* |
| 555 | * These are deprecated, but there is limited support.. |
| 556 | * |
| 557 | * The "sg_flags" translation is a joke.. |
| 558 | */ |
Alan Cox | 355d95a | 2008-02-08 04:18:48 -0800 | [diff] [blame] | 559 | static int get_sgflags(struct tty_struct *tty) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 560 | { |
| 561 | int flags = 0; |
| 562 | |
| 563 | if (!(tty->termios->c_lflag & ICANON)) { |
| 564 | if (tty->termios->c_lflag & ISIG) |
| 565 | flags |= 0x02; /* cbreak */ |
| 566 | else |
| 567 | flags |= 0x20; /* raw */ |
| 568 | } |
| 569 | if (tty->termios->c_lflag & ECHO) |
| 570 | flags |= 0x08; /* echo */ |
| 571 | if (tty->termios->c_oflag & OPOST) |
| 572 | if (tty->termios->c_oflag & ONLCR) |
| 573 | flags |= 0x10; /* crmod */ |
| 574 | return flags; |
| 575 | } |
| 576 | |
Alan Cox | 355d95a | 2008-02-08 04:18:48 -0800 | [diff] [blame] | 577 | static int get_sgttyb(struct tty_struct *tty, struct sgttyb __user *sgttyb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 578 | { |
| 579 | struct sgttyb tmp; |
| 580 | |
Arjan van de Ven | 5785c95 | 2006-09-29 02:00:43 -0700 | [diff] [blame] | 581 | mutex_lock(&tty->termios_mutex); |
Alan Cox | 606d099 | 2006-12-08 02:38:45 -0800 | [diff] [blame] | 582 | tmp.sg_ispeed = tty->termios->c_ispeed; |
| 583 | tmp.sg_ospeed = tty->termios->c_ospeed; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 584 | tmp.sg_erase = tty->termios->c_cc[VERASE]; |
| 585 | tmp.sg_kill = tty->termios->c_cc[VKILL]; |
| 586 | tmp.sg_flags = get_sgflags(tty); |
Arjan van de Ven | 5785c95 | 2006-09-29 02:00:43 -0700 | [diff] [blame] | 587 | mutex_unlock(&tty->termios_mutex); |
Alan Cox | 355d95a | 2008-02-08 04:18:48 -0800 | [diff] [blame] | 588 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 589 | return copy_to_user(sgttyb, &tmp, sizeof(tmp)) ? -EFAULT : 0; |
| 590 | } |
| 591 | |
Alan Cox | 355d95a | 2008-02-08 04:18:48 -0800 | [diff] [blame] | 592 | static void set_sgflags(struct ktermios *termios, int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 593 | { |
| 594 | termios->c_iflag = ICRNL | IXON; |
| 595 | termios->c_oflag = 0; |
| 596 | termios->c_lflag = ISIG | ICANON; |
| 597 | if (flags & 0x02) { /* cbreak */ |
| 598 | termios->c_iflag = 0; |
| 599 | termios->c_lflag &= ~ICANON; |
| 600 | } |
| 601 | if (flags & 0x08) { /* echo */ |
| 602 | termios->c_lflag |= ECHO | ECHOE | ECHOK | |
| 603 | ECHOCTL | ECHOKE | IEXTEN; |
| 604 | } |
| 605 | if (flags & 0x10) { /* crmod */ |
| 606 | termios->c_oflag |= OPOST | ONLCR; |
| 607 | } |
| 608 | if (flags & 0x20) { /* raw */ |
| 609 | termios->c_iflag = 0; |
| 610 | termios->c_lflag &= ~(ISIG | ICANON); |
| 611 | } |
| 612 | if (!(termios->c_lflag & ICANON)) { |
| 613 | termios->c_cc[VMIN] = 1; |
| 614 | termios->c_cc[VTIME] = 0; |
| 615 | } |
| 616 | } |
| 617 | |
Alan Cox | af9b897 | 2006-08-27 01:24:01 -0700 | [diff] [blame] | 618 | /** |
| 619 | * set_sgttyb - set legacy terminal values |
| 620 | * @tty: tty structure |
| 621 | * @sgttyb: pointer to old style terminal structure |
| 622 | * |
| 623 | * Updates a terminal from the legacy BSD style terminal information |
| 624 | * structure. |
| 625 | * |
| 626 | * Locking: termios_sem |
| 627 | */ |
| 628 | |
Alan Cox | 355d95a | 2008-02-08 04:18:48 -0800 | [diff] [blame] | 629 | static int set_sgttyb(struct tty_struct *tty, struct sgttyb __user *sgttyb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 630 | { |
| 631 | int retval; |
| 632 | struct sgttyb tmp; |
Alan Cox | edc6afc | 2006-12-08 02:38:44 -0800 | [diff] [blame] | 633 | struct ktermios termios; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 634 | |
| 635 | retval = tty_check_change(tty); |
| 636 | if (retval) |
| 637 | return retval; |
Alan Cox | 355d95a | 2008-02-08 04:18:48 -0800 | [diff] [blame] | 638 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 639 | if (copy_from_user(&tmp, sgttyb, sizeof(tmp))) |
| 640 | return -EFAULT; |
| 641 | |
Arjan van de Ven | 5785c95 | 2006-09-29 02:00:43 -0700 | [diff] [blame] | 642 | mutex_lock(&tty->termios_mutex); |
Jiri Slaby | 6804396 | 2007-07-15 23:40:18 -0700 | [diff] [blame] | 643 | termios = *tty->termios; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 644 | termios.c_cc[VERASE] = tmp.sg_erase; |
| 645 | termios.c_cc[VKILL] = tmp.sg_kill; |
| 646 | set_sgflags(&termios, tmp.sg_flags); |
Alan Cox | edc6afc | 2006-12-08 02:38:44 -0800 | [diff] [blame] | 647 | /* Try and encode into Bfoo format */ |
| 648 | #ifdef BOTHER |
Alan Cox | 355d95a | 2008-02-08 04:18:48 -0800 | [diff] [blame] | 649 | tty_termios_encode_baud_rate(&termios, termios.c_ispeed, |
| 650 | termios.c_ospeed); |
Alan Cox | edc6afc | 2006-12-08 02:38:44 -0800 | [diff] [blame] | 651 | #endif |
Arjan van de Ven | 5785c95 | 2006-09-29 02:00:43 -0700 | [diff] [blame] | 652 | mutex_unlock(&tty->termios_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 653 | change_termios(tty, &termios); |
| 654 | return 0; |
| 655 | } |
| 656 | #endif |
| 657 | |
| 658 | #ifdef TIOCGETC |
Alan Cox | 355d95a | 2008-02-08 04:18:48 -0800 | [diff] [blame] | 659 | static int get_tchars(struct tty_struct *tty, struct tchars __user *tchars) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 660 | { |
| 661 | struct tchars tmp; |
| 662 | |
| 663 | tmp.t_intrc = tty->termios->c_cc[VINTR]; |
| 664 | tmp.t_quitc = tty->termios->c_cc[VQUIT]; |
| 665 | tmp.t_startc = tty->termios->c_cc[VSTART]; |
| 666 | tmp.t_stopc = tty->termios->c_cc[VSTOP]; |
| 667 | tmp.t_eofc = tty->termios->c_cc[VEOF]; |
| 668 | tmp.t_brkc = tty->termios->c_cc[VEOL2]; /* what is brkc anyway? */ |
| 669 | return copy_to_user(tchars, &tmp, sizeof(tmp)) ? -EFAULT : 0; |
| 670 | } |
| 671 | |
Alan Cox | 355d95a | 2008-02-08 04:18:48 -0800 | [diff] [blame] | 672 | static int set_tchars(struct tty_struct *tty, struct tchars __user *tchars) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 673 | { |
| 674 | struct tchars tmp; |
| 675 | |
| 676 | if (copy_from_user(&tmp, tchars, sizeof(tmp))) |
| 677 | return -EFAULT; |
| 678 | tty->termios->c_cc[VINTR] = tmp.t_intrc; |
| 679 | tty->termios->c_cc[VQUIT] = tmp.t_quitc; |
| 680 | tty->termios->c_cc[VSTART] = tmp.t_startc; |
| 681 | tty->termios->c_cc[VSTOP] = tmp.t_stopc; |
| 682 | tty->termios->c_cc[VEOF] = tmp.t_eofc; |
| 683 | tty->termios->c_cc[VEOL2] = tmp.t_brkc; /* what is brkc anyway? */ |
| 684 | return 0; |
| 685 | } |
| 686 | #endif |
| 687 | |
| 688 | #ifdef TIOCGLTC |
Alan Cox | 355d95a | 2008-02-08 04:18:48 -0800 | [diff] [blame] | 689 | static int get_ltchars(struct tty_struct *tty, struct ltchars __user *ltchars) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 690 | { |
| 691 | struct ltchars tmp; |
| 692 | |
| 693 | tmp.t_suspc = tty->termios->c_cc[VSUSP]; |
Alan Cox | 355d95a | 2008-02-08 04:18:48 -0800 | [diff] [blame] | 694 | /* what is dsuspc anyway? */ |
| 695 | tmp.t_dsuspc = tty->termios->c_cc[VSUSP]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 696 | tmp.t_rprntc = tty->termios->c_cc[VREPRINT]; |
Alan Cox | 355d95a | 2008-02-08 04:18:48 -0800 | [diff] [blame] | 697 | /* what is flushc anyway? */ |
| 698 | tmp.t_flushc = tty->termios->c_cc[VEOL2]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 699 | tmp.t_werasc = tty->termios->c_cc[VWERASE]; |
| 700 | tmp.t_lnextc = tty->termios->c_cc[VLNEXT]; |
| 701 | return copy_to_user(ltchars, &tmp, sizeof(tmp)) ? -EFAULT : 0; |
| 702 | } |
| 703 | |
Alan Cox | 355d95a | 2008-02-08 04:18:48 -0800 | [diff] [blame] | 704 | static int set_ltchars(struct tty_struct *tty, struct ltchars __user *ltchars) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 705 | { |
| 706 | struct ltchars tmp; |
| 707 | |
| 708 | if (copy_from_user(&tmp, ltchars, sizeof(tmp))) |
| 709 | return -EFAULT; |
| 710 | |
| 711 | tty->termios->c_cc[VSUSP] = tmp.t_suspc; |
Alan Cox | 355d95a | 2008-02-08 04:18:48 -0800 | [diff] [blame] | 712 | /* what is dsuspc anyway? */ |
| 713 | tty->termios->c_cc[VEOL2] = tmp.t_dsuspc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 714 | tty->termios->c_cc[VREPRINT] = tmp.t_rprntc; |
Alan Cox | 355d95a | 2008-02-08 04:18:48 -0800 | [diff] [blame] | 715 | /* what is flushc anyway? */ |
| 716 | tty->termios->c_cc[VEOL2] = tmp.t_flushc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 717 | tty->termios->c_cc[VWERASE] = tmp.t_werasc; |
| 718 | tty->termios->c_cc[VLNEXT] = tmp.t_lnextc; |
| 719 | return 0; |
| 720 | } |
| 721 | #endif |
| 722 | |
Alan Cox | af9b897 | 2006-08-27 01:24:01 -0700 | [diff] [blame] | 723 | /** |
| 724 | * send_prio_char - send priority character |
| 725 | * |
| 726 | * Send a high priority character to the tty even if stopped |
| 727 | * |
Alan Cox | 5f412b2 | 2006-09-29 02:01:40 -0700 | [diff] [blame] | 728 | * Locking: none for xchar method, write ordering for write method. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 729 | */ |
Alan Cox | af9b897 | 2006-08-27 01:24:01 -0700 | [diff] [blame] | 730 | |
Alan Cox | 5f412b2 | 2006-09-29 02:01:40 -0700 | [diff] [blame] | 731 | static int send_prio_char(struct tty_struct *tty, char ch) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 732 | { |
| 733 | int was_stopped = tty->stopped; |
| 734 | |
| 735 | if (tty->driver->send_xchar) { |
| 736 | tty->driver->send_xchar(tty, ch); |
Alan Cox | 5f412b2 | 2006-09-29 02:01:40 -0700 | [diff] [blame] | 737 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 738 | } |
Alan Cox | 5f412b2 | 2006-09-29 02:01:40 -0700 | [diff] [blame] | 739 | |
Alan Cox | 9c1729d | 2007-07-15 23:39:43 -0700 | [diff] [blame] | 740 | if (tty_write_lock(tty, 0) < 0) |
Alan Cox | 5f412b2 | 2006-09-29 02:01:40 -0700 | [diff] [blame] | 741 | return -ERESTARTSYS; |
| 742 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 743 | if (was_stopped) |
| 744 | start_tty(tty); |
| 745 | tty->driver->write(tty, &ch, 1); |
| 746 | if (was_stopped) |
| 747 | stop_tty(tty); |
Alan Cox | 9c1729d | 2007-07-15 23:39:43 -0700 | [diff] [blame] | 748 | tty_write_unlock(tty); |
Alan Cox | 5f412b2 | 2006-09-29 02:01:40 -0700 | [diff] [blame] | 749 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 750 | } |
| 751 | |
Alan Cox | 0fc00e2 | 2007-11-07 01:24:56 -0800 | [diff] [blame] | 752 | /** |
| 753 | * tty_mode_ioctl - mode related ioctls |
| 754 | * @tty: tty for the ioctl |
| 755 | * @file: file pointer for the tty |
| 756 | * @cmd: command |
| 757 | * @arg: ioctl argument |
| 758 | * |
| 759 | * Perform non line discipline specific mode control ioctls. This |
| 760 | * is designed to be called by line disciplines to ensure they provide |
| 761 | * consistent mode setting. |
| 762 | */ |
| 763 | |
Alan Cox | 355d95a | 2008-02-08 04:18:48 -0800 | [diff] [blame] | 764 | int tty_mode_ioctl(struct tty_struct *tty, struct file *file, |
Alan Cox | 0fc00e2 | 2007-11-07 01:24:56 -0800 | [diff] [blame] | 765 | unsigned int cmd, unsigned long arg) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 766 | { |
Alan Cox | 355d95a | 2008-02-08 04:18:48 -0800 | [diff] [blame] | 767 | struct tty_struct *real_tty; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 768 | void __user *p = (void __user *)arg; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 769 | |
| 770 | if (tty->driver->type == TTY_DRIVER_TYPE_PTY && |
| 771 | tty->driver->subtype == PTY_TYPE_MASTER) |
| 772 | real_tty = tty->link; |
| 773 | else |
| 774 | real_tty = tty; |
| 775 | |
| 776 | switch (cmd) { |
| 777 | #ifdef TIOCGETP |
Alan Cox | 355d95a | 2008-02-08 04:18:48 -0800 | [diff] [blame] | 778 | case TIOCGETP: |
| 779 | return get_sgttyb(real_tty, (struct sgttyb __user *) arg); |
| 780 | case TIOCSETP: |
| 781 | case TIOCSETN: |
| 782 | return set_sgttyb(real_tty, (struct sgttyb __user *) arg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 783 | #endif |
| 784 | #ifdef TIOCGETC |
Alan Cox | 355d95a | 2008-02-08 04:18:48 -0800 | [diff] [blame] | 785 | case TIOCGETC: |
| 786 | return get_tchars(real_tty, p); |
| 787 | case TIOCSETC: |
| 788 | return set_tchars(real_tty, p); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 789 | #endif |
| 790 | #ifdef TIOCGLTC |
Alan Cox | 355d95a | 2008-02-08 04:18:48 -0800 | [diff] [blame] | 791 | case TIOCGLTC: |
| 792 | return get_ltchars(real_tty, p); |
| 793 | case TIOCSLTC: |
| 794 | return set_ltchars(real_tty, p); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 795 | #endif |
Alan Cox | 355d95a | 2008-02-08 04:18:48 -0800 | [diff] [blame] | 796 | case TCSETSF: |
| 797 | return set_termios(real_tty, p, TERMIOS_FLUSH | TERMIOS_WAIT | TERMIOS_OLD); |
| 798 | case TCSETSW: |
| 799 | return set_termios(real_tty, p, TERMIOS_WAIT | TERMIOS_OLD); |
| 800 | case TCSETS: |
| 801 | return set_termios(real_tty, p, TERMIOS_OLD); |
Alan Cox | edc6afc | 2006-12-08 02:38:44 -0800 | [diff] [blame] | 802 | #ifndef TCGETS2 |
Alan Cox | 355d95a | 2008-02-08 04:18:48 -0800 | [diff] [blame] | 803 | case TCGETS: |
| 804 | if (kernel_termios_to_user_termios((struct termios __user *)arg, real_tty->termios)) |
| 805 | return -EFAULT; |
| 806 | return 0; |
Alan Cox | edc6afc | 2006-12-08 02:38:44 -0800 | [diff] [blame] | 807 | #else |
Alan Cox | 355d95a | 2008-02-08 04:18:48 -0800 | [diff] [blame] | 808 | case TCGETS: |
| 809 | if (kernel_termios_to_user_termios_1((struct termios __user *)arg, real_tty->termios)) |
| 810 | return -EFAULT; |
| 811 | return 0; |
| 812 | case TCGETS2: |
| 813 | if (kernel_termios_to_user_termios((struct termios2 __user *)arg, real_tty->termios)) |
| 814 | return -EFAULT; |
| 815 | return 0; |
| 816 | case TCSETSF2: |
| 817 | return set_termios(real_tty, p, TERMIOS_FLUSH | TERMIOS_WAIT); |
| 818 | case TCSETSW2: |
| 819 | return set_termios(real_tty, p, TERMIOS_WAIT); |
| 820 | case TCSETS2: |
| 821 | return set_termios(real_tty, p, 0); |
Alan Cox | edc6afc | 2006-12-08 02:38:44 -0800 | [diff] [blame] | 822 | #endif |
Alan Cox | 355d95a | 2008-02-08 04:18:48 -0800 | [diff] [blame] | 823 | case TCGETA: |
| 824 | return get_termio(real_tty, p); |
| 825 | case TCSETAF: |
| 826 | return set_termios(real_tty, p, TERMIOS_FLUSH | TERMIOS_WAIT | TERMIOS_TERMIO); |
| 827 | case TCSETAW: |
| 828 | return set_termios(real_tty, p, TERMIOS_WAIT | TERMIOS_TERMIO); |
| 829 | case TCSETA: |
| 830 | return set_termios(real_tty, p, TERMIOS_TERMIO); |
Alan Cox | 0fc00e2 | 2007-11-07 01:24:56 -0800 | [diff] [blame] | 831 | #ifndef TCGETS2 |
Alan Cox | 355d95a | 2008-02-08 04:18:48 -0800 | [diff] [blame] | 832 | case TIOCGLCKTRMIOS: |
| 833 | if (kernel_termios_to_user_termios((struct termios __user *)arg, real_tty->termios_locked)) |
| 834 | return -EFAULT; |
| 835 | return 0; |
| 836 | case TIOCSLCKTRMIOS: |
| 837 | if (!capable(CAP_SYS_ADMIN)) |
| 838 | return -EPERM; |
| 839 | if (user_termios_to_kernel_termios(real_tty->termios_locked, |
| 840 | (struct termios __user *) arg)) |
| 841 | return -EFAULT; |
| 842 | return 0; |
Alan Cox | 0fc00e2 | 2007-11-07 01:24:56 -0800 | [diff] [blame] | 843 | #else |
Alan Cox | 355d95a | 2008-02-08 04:18:48 -0800 | [diff] [blame] | 844 | case TIOCGLCKTRMIOS: |
| 845 | if (kernel_termios_to_user_termios_1((struct termios __user *)arg, real_tty->termios_locked)) |
| 846 | return -EFAULT; |
| 847 | return 0; |
| 848 | case TIOCSLCKTRMIOS: |
| 849 | if (!capable(CAP_SYS_ADMIN)) |
| 850 | return -EPERM; |
| 851 | if (user_termios_to_kernel_termios_1(real_tty->termios_locked, |
| 852 | (struct termios __user *) arg)) |
| 853 | return -EFAULT; |
Alan Cox | 0fc00e2 | 2007-11-07 01:24:56 -0800 | [diff] [blame] | 854 | return 0; |
| 855 | #endif |
Alan Cox | 355d95a | 2008-02-08 04:18:48 -0800 | [diff] [blame] | 856 | case TIOCGSOFTCAR: |
| 857 | return put_user(C_CLOCAL(tty) ? 1 : 0, |
| 858 | (int __user *)arg); |
| 859 | case TIOCSSOFTCAR: |
| 860 | if (get_user(arg, (unsigned int __user *) arg)) |
| 861 | return -EFAULT; |
| 862 | mutex_lock(&tty->termios_mutex); |
| 863 | tty->termios->c_cflag = |
| 864 | ((tty->termios->c_cflag & ~CLOCAL) | |
| 865 | (arg ? CLOCAL : 0)); |
| 866 | mutex_unlock(&tty->termios_mutex); |
| 867 | return 0; |
| 868 | default: |
| 869 | return -ENOIOCTLCMD; |
Alan Cox | 0fc00e2 | 2007-11-07 01:24:56 -0800 | [diff] [blame] | 870 | } |
| 871 | } |
Alan Cox | 0fc00e2 | 2007-11-07 01:24:56 -0800 | [diff] [blame] | 872 | EXPORT_SYMBOL_GPL(tty_mode_ioctl); |
| 873 | |
| 874 | int tty_perform_flush(struct tty_struct *tty, unsigned long arg) |
| 875 | { |
| 876 | struct tty_ldisc *ld; |
| 877 | int retval = tty_check_change(tty); |
| 878 | if (retval) |
| 879 | return retval; |
| 880 | |
| 881 | ld = tty_ldisc_ref(tty); |
| 882 | switch (arg) { |
| 883 | case TCIFLUSH: |
| 884 | if (ld && ld->flush_buffer) |
| 885 | ld->flush_buffer(tty); |
| 886 | break; |
| 887 | case TCIOFLUSH: |
| 888 | if (ld && ld->flush_buffer) |
| 889 | ld->flush_buffer(tty); |
| 890 | /* fall through */ |
| 891 | case TCOFLUSH: |
| 892 | if (tty->driver->flush_buffer) |
| 893 | tty->driver->flush_buffer(tty); |
| 894 | break; |
| 895 | default: |
| 896 | tty_ldisc_deref(ld); |
| 897 | return -EINVAL; |
| 898 | } |
| 899 | tty_ldisc_deref(ld); |
| 900 | return 0; |
| 901 | } |
Alan Cox | 0fc00e2 | 2007-11-07 01:24:56 -0800 | [diff] [blame] | 902 | EXPORT_SYMBOL_GPL(tty_perform_flush); |
| 903 | |
Alan Cox | 355d95a | 2008-02-08 04:18:48 -0800 | [diff] [blame] | 904 | int n_tty_ioctl(struct tty_struct *tty, struct file *file, |
Alan Cox | 0fc00e2 | 2007-11-07 01:24:56 -0800 | [diff] [blame] | 905 | unsigned int cmd, unsigned long arg) |
| 906 | { |
Alan Cox | 355d95a | 2008-02-08 04:18:48 -0800 | [diff] [blame] | 907 | struct tty_struct *real_tty; |
Alan Cox | 0fc00e2 | 2007-11-07 01:24:56 -0800 | [diff] [blame] | 908 | int retval; |
| 909 | |
| 910 | if (tty->driver->type == TTY_DRIVER_TYPE_PTY && |
| 911 | tty->driver->subtype == PTY_TYPE_MASTER) |
| 912 | real_tty = tty->link; |
| 913 | else |
| 914 | real_tty = tty; |
| 915 | |
| 916 | switch (cmd) { |
Alan Cox | 355d95a | 2008-02-08 04:18:48 -0800 | [diff] [blame] | 917 | case TCXONC: |
| 918 | retval = tty_check_change(tty); |
| 919 | if (retval) |
| 920 | return retval; |
| 921 | switch (arg) { |
| 922 | case TCOOFF: |
| 923 | if (!tty->flow_stopped) { |
| 924 | tty->flow_stopped = 1; |
| 925 | stop_tty(tty); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 926 | } |
Alan Cox | 355d95a | 2008-02-08 04:18:48 -0800 | [diff] [blame] | 927 | break; |
| 928 | case TCOON: |
| 929 | if (tty->flow_stopped) { |
| 930 | tty->flow_stopped = 0; |
| 931 | start_tty(tty); |
| 932 | } |
| 933 | break; |
| 934 | case TCIOFF: |
| 935 | if (STOP_CHAR(tty) != __DISABLED_CHAR) |
| 936 | return send_prio_char(tty, STOP_CHAR(tty)); |
| 937 | break; |
| 938 | case TCION: |
| 939 | if (START_CHAR(tty) != __DISABLED_CHAR) |
| 940 | return send_prio_char(tty, START_CHAR(tty)); |
| 941 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 942 | default: |
Alan Cox | 355d95a | 2008-02-08 04:18:48 -0800 | [diff] [blame] | 943 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 944 | } |
Alan Cox | 355d95a | 2008-02-08 04:18:48 -0800 | [diff] [blame] | 945 | return 0; |
| 946 | case TCFLSH: |
| 947 | return tty_perform_flush(tty, arg); |
| 948 | case TIOCOUTQ: |
| 949 | return put_user(tty->driver->chars_in_buffer ? |
| 950 | tty->driver->chars_in_buffer(tty) : 0, |
| 951 | (int __user *) arg); |
| 952 | case TIOCINQ: |
| 953 | retval = tty->read_cnt; |
| 954 | if (L_ICANON(tty)) |
| 955 | retval = inq_canon(tty); |
| 956 | return put_user(retval, (unsigned int __user *) arg); |
| 957 | case TIOCPKT: |
| 958 | { |
| 959 | int pktmode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 960 | |
Alan Cox | 355d95a | 2008-02-08 04:18:48 -0800 | [diff] [blame] | 961 | if (tty->driver->type != TTY_DRIVER_TYPE_PTY || |
| 962 | tty->driver->subtype != PTY_TYPE_MASTER) |
| 963 | return -ENOTTY; |
| 964 | if (get_user(pktmode, (int __user *) arg)) |
| 965 | return -EFAULT; |
| 966 | if (pktmode) { |
| 967 | if (!tty->packet) { |
| 968 | tty->packet = 1; |
| 969 | tty->link->ctrl_status = 0; |
| 970 | } |
| 971 | } else |
| 972 | tty->packet = 0; |
| 973 | return 0; |
| 974 | } |
| 975 | default: |
| 976 | /* Try the mode commands */ |
| 977 | return tty_mode_ioctl(tty, file, cmd, arg); |
| 978 | } |
| 979 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 980 | EXPORT_SYMBOL(n_tty_ioctl); |