Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2 | * Copyright (C) 1991, 1992 Linus Torvalds |
| 3 | * |
| 4 | * Added support for a Unix98-style ptmx device. |
| 5 | * -- C. Scott Ananian <cananian@alumni.princeton.edu>, 14-Jan-1998 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6 | * |
Alan Cox | fe9cd96 | 2008-10-13 10:43:38 +0100 | [diff] [blame] | 7 | * When reading this code see also fs/devpts. In particular note that the |
| 8 | * driver_data field is used by the devpts side as a binding to the devpts |
| 9 | * inode. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 10 | */ |
| 11 | |
Alan Cox | fe9cd96 | 2008-10-13 10:43:38 +0100 | [diff] [blame] | 12 | #include <linux/module.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 13 | |
| 14 | #include <linux/errno.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 15 | #include <linux/interrupt.h> |
| 16 | #include <linux/tty.h> |
| 17 | #include <linux/tty_flip.h> |
| 18 | #include <linux/fcntl.h> |
Alexey Dobriyan | d43c36d | 2009-10-07 17:09:06 +0400 | [diff] [blame] | 19 | #include <linux/sched.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 20 | #include <linux/string.h> |
| 21 | #include <linux/major.h> |
| 22 | #include <linux/mm.h> |
| 23 | #include <linux/init.h> |
Alan Cox | d81ed10 | 2008-10-13 10:41:42 +0100 | [diff] [blame] | 24 | #include <linux/device.h> |
Alan Cox | fe9cd96 | 2008-10-13 10:43:38 +0100 | [diff] [blame] | 25 | #include <linux/uaccess.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 26 | #include <linux/bitops.h> |
| 27 | #include <linux/devpts_fs.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 28 | #include <linux/slab.h> |
Alan Cox | d739e65 | 2012-05-03 22:22:09 +0100 | [diff] [blame] | 29 | #include <linux/mutex.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 30 | |
Alan Cox | fe9cd96 | 2008-10-13 10:43:38 +0100 | [diff] [blame] | 31 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 32 | #ifdef CONFIG_UNIX98_PTYS |
Roel Kluin | da2bdf9 | 2009-01-07 18:09:15 -0800 | [diff] [blame] | 33 | static struct tty_driver *ptm_driver; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 34 | static struct tty_driver *pts_driver; |
Alan Cox | d739e65 | 2012-05-03 22:22:09 +0100 | [diff] [blame] | 35 | static DEFINE_MUTEX(devpts_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 36 | #endif |
| 37 | |
Alan Cox | fe9cd96 | 2008-10-13 10:43:38 +0100 | [diff] [blame] | 38 | static void pty_close(struct tty_struct *tty, struct file *filp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 39 | { |
Alan Cox | fe9cd96 | 2008-10-13 10:43:38 +0100 | [diff] [blame] | 40 | BUG_ON(!tty); |
| 41 | if (tty->driver->subtype == PTY_TYPE_MASTER) |
| 42 | WARN_ON(tty->count > 1); |
| 43 | else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 44 | if (tty->count > 2) |
| 45 | return; |
| 46 | } |
| 47 | wake_up_interruptible(&tty->read_wait); |
| 48 | wake_up_interruptible(&tty->write_wait); |
| 49 | tty->packet = 0; |
| 50 | if (!tty->link) |
| 51 | return; |
| 52 | tty->link->packet = 0; |
| 53 | set_bit(TTY_OTHER_CLOSED, &tty->link->flags); |
| 54 | wake_up_interruptible(&tty->link->read_wait); |
| 55 | wake_up_interruptible(&tty->link->write_wait); |
| 56 | if (tty->driver->subtype == PTY_TYPE_MASTER) { |
| 57 | set_bit(TTY_OTHER_CLOSED, &tty->flags); |
Greg Kroah-Hartman | ce1000d | 2012-02-24 13:56:36 -0800 | [diff] [blame] | 58 | #ifdef CONFIG_UNIX98_PTYS |
Alan Cox | d739e65 | 2012-05-03 22:22:09 +0100 | [diff] [blame] | 59 | if (tty->driver == ptm_driver) { |
| 60 | mutex_lock(&devpts_mutex); |
Greg Kroah-Hartman | ce1000d | 2012-02-24 13:56:36 -0800 | [diff] [blame] | 61 | devpts_pty_kill(tty->link); |
Alan Cox | d739e65 | 2012-05-03 22:22:09 +0100 | [diff] [blame] | 62 | mutex_unlock(&devpts_mutex); |
| 63 | } |
Greg Kroah-Hartman | ce1000d | 2012-02-24 13:56:36 -0800 | [diff] [blame] | 64 | #endif |
Linus Torvalds | f309532 | 2012-06-02 15:21:43 -0700 | [diff] [blame^] | 65 | tty_unlock(); |
Arnd Bergmann | 11dbf20 | 2010-06-18 14:58:07 +0200 | [diff] [blame] | 66 | tty_vhangup(tty->link); |
Linus Torvalds | f309532 | 2012-06-02 15:21:43 -0700 | [diff] [blame^] | 67 | tty_lock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 68 | } |
| 69 | } |
| 70 | |
| 71 | /* |
| 72 | * The unthrottle routine is called by the line discipline to signal |
| 73 | * that it can receive more characters. For PTY's, the TTY_THROTTLED |
| 74 | * flag is always set, to force the line discipline to always call the |
Alan Cox | fe9cd96 | 2008-10-13 10:43:38 +0100 | [diff] [blame] | 75 | * unthrottle routine when there are fewer than TTY_THRESHOLD_UNTHROTTLE |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 76 | * characters in the queue. This is necessary since each time this |
| 77 | * happens, we need to wake up any sleeping processes that could be |
| 78 | * (1) trying to send data to the pty, or (2) waiting in wait_until_sent() |
| 79 | * for the pty buffer to be drained. |
| 80 | */ |
Alan Cox | fe9cd96 | 2008-10-13 10:43:38 +0100 | [diff] [blame] | 81 | static void pty_unthrottle(struct tty_struct *tty) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 82 | { |
Alan Cox | d945cb9 | 2009-07-07 16:39:41 +0100 | [diff] [blame] | 83 | tty_wakeup(tty->link); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 84 | set_bit(TTY_THROTTLED, &tty->flags); |
| 85 | } |
| 86 | |
Alan Cox | d945cb9 | 2009-07-07 16:39:41 +0100 | [diff] [blame] | 87 | /** |
| 88 | * pty_space - report space left for writing |
| 89 | * @to: tty we are writing into |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 90 | * |
Alan Cox | d945cb9 | 2009-07-07 16:39:41 +0100 | [diff] [blame] | 91 | * The tty buffers allow 64K but we sneak a peak and clip at 8K this |
| 92 | * allows a lot of overspill room for echo and other fun messes to |
| 93 | * be handled properly |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 94 | */ |
Alan Cox | d945cb9 | 2009-07-07 16:39:41 +0100 | [diff] [blame] | 95 | |
| 96 | static int pty_space(struct tty_struct *to) |
| 97 | { |
| 98 | int n = 8192 - to->buf.memory_used; |
| 99 | if (n < 0) |
| 100 | return 0; |
| 101 | return n; |
| 102 | } |
| 103 | |
| 104 | /** |
| 105 | * pty_write - write to a pty |
| 106 | * @tty: the tty we write from |
| 107 | * @buf: kernel buffer of data |
| 108 | * @count: bytes to write |
| 109 | * |
| 110 | * Our "hardware" write method. Data is coming from the ldisc which |
| 111 | * may be in a non sleeping state. We simply throw this at the other |
| 112 | * end of the link as if we were an IRQ handler receiving stuff for |
| 113 | * the other side of the pty/tty pair. |
| 114 | */ |
| 115 | |
Linus Torvalds | ac89a91 | 2009-09-05 13:27:10 -0700 | [diff] [blame] | 116 | static int pty_write(struct tty_struct *tty, const unsigned char *buf, int c) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 117 | { |
| 118 | struct tty_struct *to = tty->link; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 119 | |
Alan Cox | d945cb9 | 2009-07-07 16:39:41 +0100 | [diff] [blame] | 120 | if (tty->stopped) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 121 | return 0; |
| 122 | |
Alan Cox | d945cb9 | 2009-07-07 16:39:41 +0100 | [diff] [blame] | 123 | if (c > 0) { |
| 124 | /* Stuff the data into the input queue of the other end */ |
| 125 | c = tty_insert_flip_string(to, buf, c); |
| 126 | /* And shovel */ |
Linus Torvalds | 202c467 | 2009-09-18 07:05:58 -0700 | [diff] [blame] | 127 | if (c) { |
| 128 | tty_flip_buffer_push(to); |
| 129 | tty_wakeup(tty); |
| 130 | } |
Alan Cox | 762faae | 2009-06-16 17:01:13 +0100 | [diff] [blame] | 131 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 132 | return c; |
| 133 | } |
| 134 | |
Alan Cox | d945cb9 | 2009-07-07 16:39:41 +0100 | [diff] [blame] | 135 | /** |
| 136 | * pty_write_room - write space |
| 137 | * @tty: tty we are writing from |
| 138 | * |
| 139 | * Report how many bytes the ldisc can send into the queue for |
| 140 | * the other device. |
| 141 | */ |
| 142 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 143 | static int pty_write_room(struct tty_struct *tty) |
| 144 | { |
Linus Torvalds | 85dfd81 | 2009-08-10 13:21:19 -0700 | [diff] [blame] | 145 | if (tty->stopped) |
| 146 | return 0; |
Alan Cox | d945cb9 | 2009-07-07 16:39:41 +0100 | [diff] [blame] | 147 | return pty_space(tty->link); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 148 | } |
| 149 | |
Alan Cox | d945cb9 | 2009-07-07 16:39:41 +0100 | [diff] [blame] | 150 | /** |
| 151 | * pty_chars_in_buffer - characters currently in our tx queue |
| 152 | * @tty: our tty |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 153 | * |
Alan Cox | d945cb9 | 2009-07-07 16:39:41 +0100 | [diff] [blame] | 154 | * Report how much we have in the transmit queue. As everything is |
| 155 | * instantly at the other end this is easy to implement. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 156 | */ |
Alan Cox | d945cb9 | 2009-07-07 16:39:41 +0100 | [diff] [blame] | 157 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 158 | static int pty_chars_in_buffer(struct tty_struct *tty) |
| 159 | { |
Alan Cox | d945cb9 | 2009-07-07 16:39:41 +0100 | [diff] [blame] | 160 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 161 | } |
| 162 | |
| 163 | /* Set the lock flag on a pty */ |
Alan Cox | fe9cd96 | 2008-10-13 10:43:38 +0100 | [diff] [blame] | 164 | static int pty_set_lock(struct tty_struct *tty, int __user *arg) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 165 | { |
| 166 | int val; |
Alan Cox | fe9cd96 | 2008-10-13 10:43:38 +0100 | [diff] [blame] | 167 | if (get_user(val, arg)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 168 | return -EFAULT; |
| 169 | if (val) |
| 170 | set_bit(TTY_PTY_LOCK, &tty->flags); |
| 171 | else |
| 172 | clear_bit(TTY_PTY_LOCK, &tty->flags); |
| 173 | return 0; |
| 174 | } |
| 175 | |
hyc@symas.com | 26df6d1 | 2010-06-22 10:14:49 -0700 | [diff] [blame] | 176 | /* Send a signal to the slave */ |
| 177 | static int pty_signal(struct tty_struct *tty, int sig) |
| 178 | { |
| 179 | unsigned long flags; |
| 180 | struct pid *pgrp; |
| 181 | |
| 182 | if (tty->link) { |
| 183 | spin_lock_irqsave(&tty->link->ctrl_lock, flags); |
| 184 | pgrp = get_pid(tty->link->pgrp); |
| 185 | spin_unlock_irqrestore(&tty->link->ctrl_lock, flags); |
| 186 | |
| 187 | kill_pgrp(pgrp, sig, 1); |
| 188 | put_pid(pgrp); |
| 189 | } |
| 190 | return 0; |
| 191 | } |
| 192 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 193 | static void pty_flush_buffer(struct tty_struct *tty) |
| 194 | { |
| 195 | struct tty_struct *to = tty->link; |
Alan Cox | 04f378b | 2008-04-30 00:53:29 -0700 | [diff] [blame] | 196 | unsigned long flags; |
Alan Cox | fe9cd96 | 2008-10-13 10:43:38 +0100 | [diff] [blame] | 197 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 198 | if (!to) |
| 199 | return; |
Alan Cox | d945cb9 | 2009-07-07 16:39:41 +0100 | [diff] [blame] | 200 | /* tty_buffer_flush(to); FIXME */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 201 | if (to->packet) { |
Alan Cox | 04f378b | 2008-04-30 00:53:29 -0700 | [diff] [blame] | 202 | spin_lock_irqsave(&tty->ctrl_lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 203 | tty->ctrl_status |= TIOCPKT_FLUSHWRITE; |
| 204 | wake_up_interruptible(&to->read_wait); |
Alan Cox | 04f378b | 2008-04-30 00:53:29 -0700 | [diff] [blame] | 205 | spin_unlock_irqrestore(&tty->ctrl_lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 206 | } |
| 207 | } |
| 208 | |
Alan Cox | fe9cd96 | 2008-10-13 10:43:38 +0100 | [diff] [blame] | 209 | static int pty_open(struct tty_struct *tty, struct file *filp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 210 | { |
| 211 | int retval = -ENODEV; |
| 212 | |
| 213 | if (!tty || !tty->link) |
| 214 | goto out; |
| 215 | |
| 216 | retval = -EIO; |
| 217 | if (test_bit(TTY_OTHER_CLOSED, &tty->flags)) |
| 218 | goto out; |
| 219 | if (test_bit(TTY_PTY_LOCK, &tty->link->flags)) |
| 220 | goto out; |
| 221 | if (tty->link->count != 1) |
| 222 | goto out; |
| 223 | |
| 224 | clear_bit(TTY_OTHER_CLOSED, &tty->link->flags); |
| 225 | set_bit(TTY_THROTTLED, &tty->flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 226 | retval = 0; |
| 227 | out: |
| 228 | return retval; |
| 229 | } |
| 230 | |
Alan Cox | fe9cd96 | 2008-10-13 10:43:38 +0100 | [diff] [blame] | 231 | static void pty_set_termios(struct tty_struct *tty, |
| 232 | struct ktermios *old_termios) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 233 | { |
Alan Cox | fe9cd96 | 2008-10-13 10:43:38 +0100 | [diff] [blame] | 234 | tty->termios->c_cflag &= ~(CSIZE | PARENB); |
| 235 | tty->termios->c_cflag |= (CS8 | CREAD); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 236 | } |
| 237 | |
Alan Cox | fc6f623 | 2009-01-02 13:43:17 +0000 | [diff] [blame] | 238 | /** |
| 239 | * pty_do_resize - resize event |
| 240 | * @tty: tty being resized |
Alan Cox | c774bda | 2009-01-11 19:46:49 +0000 | [diff] [blame] | 241 | * @ws: window size being set. |
Alan Cox | fc6f623 | 2009-01-02 13:43:17 +0000 | [diff] [blame] | 242 | * |
Daniel Mack | 3ad2f3f | 2010-02-03 08:01:28 +0800 | [diff] [blame] | 243 | * Update the termios variables and send the necessary signals to |
Alan Cox | fc6f623 | 2009-01-02 13:43:17 +0000 | [diff] [blame] | 244 | * peform a terminal resize correctly |
| 245 | */ |
| 246 | |
| 247 | int pty_resize(struct tty_struct *tty, struct winsize *ws) |
| 248 | { |
| 249 | struct pid *pgrp, *rpgrp; |
| 250 | unsigned long flags; |
| 251 | struct tty_struct *pty = tty->link; |
| 252 | |
| 253 | /* For a PTY we need to lock the tty side */ |
| 254 | mutex_lock(&tty->termios_mutex); |
| 255 | if (!memcmp(ws, &tty->winsize, sizeof(*ws))) |
| 256 | goto done; |
| 257 | |
| 258 | /* Get the PID values and reference them so we can |
| 259 | avoid holding the tty ctrl lock while sending signals. |
| 260 | We need to lock these individually however. */ |
| 261 | |
| 262 | spin_lock_irqsave(&tty->ctrl_lock, flags); |
| 263 | pgrp = get_pid(tty->pgrp); |
| 264 | spin_unlock_irqrestore(&tty->ctrl_lock, flags); |
| 265 | |
| 266 | spin_lock_irqsave(&pty->ctrl_lock, flags); |
| 267 | rpgrp = get_pid(pty->pgrp); |
| 268 | spin_unlock_irqrestore(&pty->ctrl_lock, flags); |
| 269 | |
| 270 | if (pgrp) |
| 271 | kill_pgrp(pgrp, SIGWINCH, 1); |
| 272 | if (rpgrp != pgrp && rpgrp) |
| 273 | kill_pgrp(rpgrp, SIGWINCH, 1); |
| 274 | |
| 275 | put_pid(pgrp); |
| 276 | put_pid(rpgrp); |
| 277 | |
| 278 | tty->winsize = *ws; |
| 279 | pty->winsize = *ws; /* Never used so will go away soon */ |
| 280 | done: |
| 281 | mutex_unlock(&tty->termios_mutex); |
| 282 | return 0; |
| 283 | } |
| 284 | |
Linus Torvalds | 342a597 | 2009-09-30 07:49:40 -0700 | [diff] [blame] | 285 | /* Traditional BSD devices */ |
| 286 | #ifdef CONFIG_LEGACY_PTYS |
| 287 | |
Alan Cox | bf970ee | 2008-10-13 10:42:39 +0100 | [diff] [blame] | 288 | static int pty_install(struct tty_driver *driver, struct tty_struct *tty) |
| 289 | { |
| 290 | struct tty_struct *o_tty; |
| 291 | int idx = tty->index; |
| 292 | int retval; |
| 293 | |
| 294 | o_tty = alloc_tty_struct(); |
| 295 | if (!o_tty) |
| 296 | return -ENOMEM; |
| 297 | if (!try_module_get(driver->other->owner)) { |
| 298 | /* This cannot in fact currently happen */ |
Jiri Slaby | 8a1b8d7 | 2011-03-23 10:48:33 +0100 | [diff] [blame] | 299 | retval = -ENOMEM; |
| 300 | goto err_free_tty; |
Alan Cox | bf970ee | 2008-10-13 10:42:39 +0100 | [diff] [blame] | 301 | } |
| 302 | initialize_tty_struct(o_tty, driver->other, idx); |
| 303 | |
| 304 | /* We always use new tty termios data so we can do this |
| 305 | the easy way .. */ |
| 306 | retval = tty_init_termios(tty); |
| 307 | if (retval) |
Jiri Slaby | a9dccdd | 2011-03-23 10:48:36 +0100 | [diff] [blame] | 308 | goto err_deinit_tty; |
Alan Cox | bf970ee | 2008-10-13 10:42:39 +0100 | [diff] [blame] | 309 | |
| 310 | retval = tty_init_termios(o_tty); |
Jiri Slaby | 8a1b8d7 | 2011-03-23 10:48:33 +0100 | [diff] [blame] | 311 | if (retval) |
| 312 | goto err_free_termios; |
Alan Cox | fe9cd96 | 2008-10-13 10:43:38 +0100 | [diff] [blame] | 313 | |
Alan Cox | bf970ee | 2008-10-13 10:42:39 +0100 | [diff] [blame] | 314 | /* |
| 315 | * Everything allocated ... set up the o_tty structure. |
| 316 | */ |
| 317 | driver->other->ttys[idx] = o_tty; |
| 318 | tty_driver_kref_get(driver->other); |
| 319 | if (driver->subtype == PTY_TYPE_MASTER) |
| 320 | o_tty->count++; |
| 321 | /* Establish the links in both directions */ |
| 322 | tty->link = o_tty; |
| 323 | o_tty->link = tty; |
| 324 | |
| 325 | tty_driver_kref_get(driver); |
| 326 | tty->count++; |
| 327 | driver->ttys[idx] = tty; |
| 328 | return 0; |
Jiri Slaby | 8a1b8d7 | 2011-03-23 10:48:33 +0100 | [diff] [blame] | 329 | err_free_termios: |
| 330 | tty_free_termios(tty); |
Jiri Slaby | a9dccdd | 2011-03-23 10:48:36 +0100 | [diff] [blame] | 331 | err_deinit_tty: |
| 332 | deinitialize_tty_struct(o_tty); |
Alan Cox | bf970ee | 2008-10-13 10:42:39 +0100 | [diff] [blame] | 333 | module_put(o_tty->driver->owner); |
Jiri Slaby | 8a1b8d7 | 2011-03-23 10:48:33 +0100 | [diff] [blame] | 334 | err_free_tty: |
Alan Cox | bf970ee | 2008-10-13 10:42:39 +0100 | [diff] [blame] | 335 | free_tty_struct(o_tty); |
Jiri Slaby | 8a1b8d7 | 2011-03-23 10:48:33 +0100 | [diff] [blame] | 336 | return retval; |
Alan Cox | bf970ee | 2008-10-13 10:42:39 +0100 | [diff] [blame] | 337 | } |
| 338 | |
Alan Cox | 6caa76b | 2011-02-14 16:27:22 +0000 | [diff] [blame] | 339 | static int pty_bsd_ioctl(struct tty_struct *tty, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 340 | unsigned int cmd, unsigned long arg) |
| 341 | { |
| 342 | switch (cmd) { |
| 343 | case TIOCSPTLCK: /* Set PT Lock (disallow slave open) */ |
| 344 | return pty_set_lock(tty, (int __user *) arg); |
hyc@symas.com | 26df6d1 | 2010-06-22 10:14:49 -0700 | [diff] [blame] | 345 | case TIOCSIG: /* Send signal to other side of pty */ |
| 346 | return pty_signal(tty, (int) arg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 347 | } |
| 348 | return -ENOIOCTLCMD; |
| 349 | } |
| 350 | |
Kay Sievers | dc8c858 | 2007-08-15 12:25:38 +0200 | [diff] [blame] | 351 | static int legacy_count = CONFIG_LEGACY_PTY_COUNT; |
| 352 | module_param(legacy_count, int, 0); |
| 353 | |
Linus Torvalds | 342a597 | 2009-09-30 07:49:40 -0700 | [diff] [blame] | 354 | /* |
| 355 | * The master side of a pty can do TIOCSPTLCK and thus |
| 356 | * has pty_bsd_ioctl. |
| 357 | */ |
| 358 | static const struct tty_operations master_pty_ops_bsd = { |
| 359 | .install = pty_install, |
Alan Cox | 3e8e88c | 2008-04-30 00:54:10 -0700 | [diff] [blame] | 360 | .open = pty_open, |
| 361 | .close = pty_close, |
| 362 | .write = pty_write, |
| 363 | .write_room = pty_write_room, |
| 364 | .flush_buffer = pty_flush_buffer, |
| 365 | .chars_in_buffer = pty_chars_in_buffer, |
| 366 | .unthrottle = pty_unthrottle, |
| 367 | .set_termios = pty_set_termios, |
| 368 | .ioctl = pty_bsd_ioctl, |
Alan Cox | fc6f623 | 2009-01-02 13:43:17 +0000 | [diff] [blame] | 369 | .resize = pty_resize |
Alan Cox | 3e8e88c | 2008-04-30 00:54:10 -0700 | [diff] [blame] | 370 | }; |
| 371 | |
Linus Torvalds | 342a597 | 2009-09-30 07:49:40 -0700 | [diff] [blame] | 372 | static const struct tty_operations slave_pty_ops_bsd = { |
| 373 | .install = pty_install, |
| 374 | .open = pty_open, |
| 375 | .close = pty_close, |
| 376 | .write = pty_write, |
| 377 | .write_room = pty_write_room, |
| 378 | .flush_buffer = pty_flush_buffer, |
| 379 | .chars_in_buffer = pty_chars_in_buffer, |
| 380 | .unthrottle = pty_unthrottle, |
| 381 | .set_termios = pty_set_termios, |
| 382 | .resize = pty_resize |
| 383 | }; |
| 384 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 385 | static void __init legacy_pty_init(void) |
| 386 | { |
Linus Torvalds | 342a597 | 2009-09-30 07:49:40 -0700 | [diff] [blame] | 387 | struct tty_driver *pty_driver, *pty_slave_driver; |
| 388 | |
Kay Sievers | dc8c858 | 2007-08-15 12:25:38 +0200 | [diff] [blame] | 389 | if (legacy_count <= 0) |
| 390 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 391 | |
Kay Sievers | dc8c858 | 2007-08-15 12:25:38 +0200 | [diff] [blame] | 392 | pty_driver = alloc_tty_driver(legacy_count); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 393 | if (!pty_driver) |
| 394 | panic("Couldn't allocate pty driver"); |
| 395 | |
Kay Sievers | dc8c858 | 2007-08-15 12:25:38 +0200 | [diff] [blame] | 396 | pty_slave_driver = alloc_tty_driver(legacy_count); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 397 | if (!pty_slave_driver) |
| 398 | panic("Couldn't allocate pty slave driver"); |
| 399 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 400 | pty_driver->driver_name = "pty_master"; |
| 401 | pty_driver->name = "pty"; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 402 | pty_driver->major = PTY_MASTER_MAJOR; |
| 403 | pty_driver->minor_start = 0; |
| 404 | pty_driver->type = TTY_DRIVER_TYPE_PTY; |
| 405 | pty_driver->subtype = PTY_TYPE_MASTER; |
| 406 | pty_driver->init_termios = tty_std_termios; |
| 407 | pty_driver->init_termios.c_iflag = 0; |
| 408 | pty_driver->init_termios.c_oflag = 0; |
| 409 | pty_driver->init_termios.c_cflag = B38400 | CS8 | CREAD; |
| 410 | pty_driver->init_termios.c_lflag = 0; |
Alan Cox | 606d099 | 2006-12-08 02:38:45 -0800 | [diff] [blame] | 411 | pty_driver->init_termios.c_ispeed = 38400; |
| 412 | pty_driver->init_termios.c_ospeed = 38400; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 413 | pty_driver->flags = TTY_DRIVER_RESET_TERMIOS | TTY_DRIVER_REAL_RAW; |
| 414 | pty_driver->other = pty_slave_driver; |
Linus Torvalds | 342a597 | 2009-09-30 07:49:40 -0700 | [diff] [blame] | 415 | tty_set_operations(pty_driver, &master_pty_ops_bsd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 416 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 417 | pty_slave_driver->driver_name = "pty_slave"; |
| 418 | pty_slave_driver->name = "ttyp"; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 419 | pty_slave_driver->major = PTY_SLAVE_MAJOR; |
| 420 | pty_slave_driver->minor_start = 0; |
| 421 | pty_slave_driver->type = TTY_DRIVER_TYPE_PTY; |
| 422 | pty_slave_driver->subtype = PTY_TYPE_SLAVE; |
| 423 | pty_slave_driver->init_termios = tty_std_termios; |
| 424 | pty_slave_driver->init_termios.c_cflag = B38400 | CS8 | CREAD; |
Alan Cox | 606d099 | 2006-12-08 02:38:45 -0800 | [diff] [blame] | 425 | pty_slave_driver->init_termios.c_ispeed = 38400; |
| 426 | pty_slave_driver->init_termios.c_ospeed = 38400; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 427 | pty_slave_driver->flags = TTY_DRIVER_RESET_TERMIOS | |
| 428 | TTY_DRIVER_REAL_RAW; |
| 429 | pty_slave_driver->other = pty_driver; |
Linus Torvalds | 342a597 | 2009-09-30 07:49:40 -0700 | [diff] [blame] | 430 | tty_set_operations(pty_slave_driver, &slave_pty_ops_bsd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 431 | |
| 432 | if (tty_register_driver(pty_driver)) |
| 433 | panic("Couldn't register pty driver"); |
| 434 | if (tty_register_driver(pty_slave_driver)) |
| 435 | panic("Couldn't register pty slave driver"); |
| 436 | } |
| 437 | #else |
| 438 | static inline void legacy_pty_init(void) { } |
| 439 | #endif |
| 440 | |
| 441 | /* Unix98 devices */ |
| 442 | #ifdef CONFIG_UNIX98_PTYS |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 443 | |
Alan Cox | d81ed10 | 2008-10-13 10:41:42 +0100 | [diff] [blame] | 444 | static struct cdev ptmx_cdev; |
| 445 | |
Alan Cox | 6caa76b | 2011-02-14 16:27:22 +0000 | [diff] [blame] | 446 | static int pty_unix98_ioctl(struct tty_struct *tty, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 447 | unsigned int cmd, unsigned long arg) |
| 448 | { |
| 449 | switch (cmd) { |
| 450 | case TIOCSPTLCK: /* Set PT Lock (disallow slave open) */ |
| 451 | return pty_set_lock(tty, (int __user *)arg); |
| 452 | case TIOCGPTN: /* Get PT Number */ |
| 453 | return put_user(tty->index, (unsigned int __user *)arg); |
hyc@symas.com | 26df6d1 | 2010-06-22 10:14:49 -0700 | [diff] [blame] | 454 | case TIOCSIG: /* Send signal to other side of pty */ |
| 455 | return pty_signal(tty, (int) arg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 456 | } |
| 457 | |
| 458 | return -ENOIOCTLCMD; |
| 459 | } |
| 460 | |
Alan Cox | 99f1fe1 | 2008-10-13 10:42:00 +0100 | [diff] [blame] | 461 | /** |
| 462 | * ptm_unix98_lookup - find a pty master |
| 463 | * @driver: ptm driver |
| 464 | * @idx: tty index |
| 465 | * |
| 466 | * Look up a pty master device. Called under the tty_mutex for now. |
| 467 | * This provides our locking. |
| 468 | */ |
| 469 | |
Sukadev Bhattiprolu | 15f1a63 | 2008-10-13 10:42:59 +0100 | [diff] [blame] | 470 | static struct tty_struct *ptm_unix98_lookup(struct tty_driver *driver, |
| 471 | struct inode *ptm_inode, int idx) |
Alan Cox | 99f1fe1 | 2008-10-13 10:42:00 +0100 | [diff] [blame] | 472 | { |
Konstantin Khlebnikov | 593a27c | 2012-01-05 13:04:21 +0400 | [diff] [blame] | 473 | /* Master must be open via /dev/ptmx */ |
| 474 | return ERR_PTR(-EIO); |
Alan Cox | 99f1fe1 | 2008-10-13 10:42:00 +0100 | [diff] [blame] | 475 | } |
| 476 | |
| 477 | /** |
| 478 | * pts_unix98_lookup - find a pty slave |
| 479 | * @driver: pts driver |
| 480 | * @idx: tty index |
| 481 | * |
| 482 | * Look up a pty master device. Called under the tty_mutex for now. |
Alan Cox | d739e65 | 2012-05-03 22:22:09 +0100 | [diff] [blame] | 483 | * This provides our locking for the tty pointer. |
Alan Cox | 99f1fe1 | 2008-10-13 10:42:00 +0100 | [diff] [blame] | 484 | */ |
| 485 | |
Sukadev Bhattiprolu | 15f1a63 | 2008-10-13 10:42:59 +0100 | [diff] [blame] | 486 | static struct tty_struct *pts_unix98_lookup(struct tty_driver *driver, |
| 487 | struct inode *pts_inode, int idx) |
Alan Cox | 99f1fe1 | 2008-10-13 10:42:00 +0100 | [diff] [blame] | 488 | { |
Alan Cox | d739e65 | 2012-05-03 22:22:09 +0100 | [diff] [blame] | 489 | struct tty_struct *tty; |
| 490 | |
| 491 | mutex_lock(&devpts_mutex); |
| 492 | tty = devpts_get_tty(pts_inode, idx); |
| 493 | mutex_unlock(&devpts_mutex); |
Alan Cox | 99f1fe1 | 2008-10-13 10:42:00 +0100 | [diff] [blame] | 494 | /* Master must be open before slave */ |
| 495 | if (!tty) |
| 496 | return ERR_PTR(-EIO); |
| 497 | return tty; |
| 498 | } |
| 499 | |
Alan Cox | bf970ee | 2008-10-13 10:42:39 +0100 | [diff] [blame] | 500 | static void pty_unix98_shutdown(struct tty_struct *tty) |
Alan Cox | feebed6 | 2008-10-13 10:41:30 +0100 | [diff] [blame] | 501 | { |
Jiri Slaby | 24d406a | 2011-08-10 14:59:28 +0200 | [diff] [blame] | 502 | tty_driver_remove_tty(tty->driver, tty); |
Alan Cox | feebed6 | 2008-10-13 10:41:30 +0100 | [diff] [blame] | 503 | /* We have our own method as we don't use the tty index */ |
| 504 | kfree(tty->termios); |
Alan Cox | feebed6 | 2008-10-13 10:41:30 +0100 | [diff] [blame] | 505 | } |
| 506 | |
Alan Cox | 8b0a88d | 2008-10-13 10:42:19 +0100 | [diff] [blame] | 507 | /* We have no need to install and remove our tty objects as devpts does all |
| 508 | the work for us */ |
| 509 | |
Alan Cox | bf970ee | 2008-10-13 10:42:39 +0100 | [diff] [blame] | 510 | static int pty_unix98_install(struct tty_driver *driver, struct tty_struct *tty) |
Alan Cox | 8b0a88d | 2008-10-13 10:42:19 +0100 | [diff] [blame] | 511 | { |
Alan Cox | bf970ee | 2008-10-13 10:42:39 +0100 | [diff] [blame] | 512 | struct tty_struct *o_tty; |
| 513 | int idx = tty->index; |
| 514 | |
| 515 | o_tty = alloc_tty_struct(); |
| 516 | if (!o_tty) |
| 517 | return -ENOMEM; |
| 518 | if (!try_module_get(driver->other->owner)) { |
| 519 | /* This cannot in fact currently happen */ |
Jiri Slaby | c18d77a | 2011-03-23 10:48:34 +0100 | [diff] [blame] | 520 | goto err_free_tty; |
Alan Cox | bf970ee | 2008-10-13 10:42:39 +0100 | [diff] [blame] | 521 | } |
| 522 | initialize_tty_struct(o_tty, driver->other, idx); |
| 523 | |
Alan Cox | 8dff04e | 2008-10-13 10:43:58 +0100 | [diff] [blame] | 524 | tty->termios = kzalloc(sizeof(struct ktermios[2]), GFP_KERNEL); |
Alan Cox | bf970ee | 2008-10-13 10:42:39 +0100 | [diff] [blame] | 525 | if (tty->termios == NULL) |
Jiri Slaby | c18d77a | 2011-03-23 10:48:34 +0100 | [diff] [blame] | 526 | goto err_free_mem; |
Alan Cox | bf970ee | 2008-10-13 10:42:39 +0100 | [diff] [blame] | 527 | *tty->termios = driver->init_termios; |
Alan Cox | 8dff04e | 2008-10-13 10:43:58 +0100 | [diff] [blame] | 528 | tty->termios_locked = tty->termios + 1; |
| 529 | |
| 530 | o_tty->termios = kzalloc(sizeof(struct ktermios[2]), GFP_KERNEL); |
Alan Cox | bf970ee | 2008-10-13 10:42:39 +0100 | [diff] [blame] | 531 | if (o_tty->termios == NULL) |
Jiri Slaby | c18d77a | 2011-03-23 10:48:34 +0100 | [diff] [blame] | 532 | goto err_free_mem; |
Alan Cox | bf970ee | 2008-10-13 10:42:39 +0100 | [diff] [blame] | 533 | *o_tty->termios = driver->other->init_termios; |
Alan Cox | 8dff04e | 2008-10-13 10:43:58 +0100 | [diff] [blame] | 534 | o_tty->termios_locked = o_tty->termios + 1; |
Alan Cox | bf970ee | 2008-10-13 10:42:39 +0100 | [diff] [blame] | 535 | |
| 536 | tty_driver_kref_get(driver->other); |
| 537 | if (driver->subtype == PTY_TYPE_MASTER) |
| 538 | o_tty->count++; |
| 539 | /* Establish the links in both directions */ |
| 540 | tty->link = o_tty; |
| 541 | o_tty->link = tty; |
| 542 | /* |
| 543 | * All structures have been allocated, so now we install them. |
| 544 | * Failures after this point use release_tty to clean up, so |
| 545 | * there's no need to null out the local pointers. |
| 546 | */ |
| 547 | tty_driver_kref_get(driver); |
| 548 | tty->count++; |
Alan Cox | 8b0a88d | 2008-10-13 10:42:19 +0100 | [diff] [blame] | 549 | return 0; |
Jiri Slaby | c18d77a | 2011-03-23 10:48:34 +0100 | [diff] [blame] | 550 | err_free_mem: |
Jiri Slaby | a9dccdd | 2011-03-23 10:48:36 +0100 | [diff] [blame] | 551 | deinitialize_tty_struct(o_tty); |
Alan Cox | 8dff04e | 2008-10-13 10:43:58 +0100 | [diff] [blame] | 552 | kfree(o_tty->termios); |
Alan Cox | 8dff04e | 2008-10-13 10:43:58 +0100 | [diff] [blame] | 553 | kfree(tty->termios); |
Jiri Slaby | c18d77a | 2011-03-23 10:48:34 +0100 | [diff] [blame] | 554 | module_put(o_tty->driver->owner); |
| 555 | err_free_tty: |
| 556 | free_tty_struct(o_tty); |
Alan Cox | bf970ee | 2008-10-13 10:42:39 +0100 | [diff] [blame] | 557 | return -ENOMEM; |
Alan Cox | 8b0a88d | 2008-10-13 10:42:19 +0100 | [diff] [blame] | 558 | } |
| 559 | |
Jiri Slaby | 484af54 | 2011-11-16 16:27:11 +0100 | [diff] [blame] | 560 | static void ptm_unix98_remove(struct tty_driver *driver, struct tty_struct *tty) |
Alan Cox | 8b0a88d | 2008-10-13 10:42:19 +0100 | [diff] [blame] | 561 | { |
Jiri Slaby | 484af54 | 2011-11-16 16:27:11 +0100 | [diff] [blame] | 562 | } |
| 563 | |
| 564 | static void pts_unix98_remove(struct tty_driver *driver, struct tty_struct *tty) |
| 565 | { |
Alan Cox | 8b0a88d | 2008-10-13 10:42:19 +0100 | [diff] [blame] | 566 | } |
| 567 | |
Alan Cox | feebed6 | 2008-10-13 10:41:30 +0100 | [diff] [blame] | 568 | static const struct tty_operations ptm_unix98_ops = { |
Alan Cox | 99f1fe1 | 2008-10-13 10:42:00 +0100 | [diff] [blame] | 569 | .lookup = ptm_unix98_lookup, |
Alan Cox | bf970ee | 2008-10-13 10:42:39 +0100 | [diff] [blame] | 570 | .install = pty_unix98_install, |
Jiri Slaby | 484af54 | 2011-11-16 16:27:11 +0100 | [diff] [blame] | 571 | .remove = ptm_unix98_remove, |
Alan Cox | 3e8e88c | 2008-04-30 00:54:10 -0700 | [diff] [blame] | 572 | .open = pty_open, |
| 573 | .close = pty_close, |
| 574 | .write = pty_write, |
| 575 | .write_room = pty_write_room, |
| 576 | .flush_buffer = pty_flush_buffer, |
| 577 | .chars_in_buffer = pty_chars_in_buffer, |
| 578 | .unthrottle = pty_unthrottle, |
| 579 | .set_termios = pty_set_termios, |
Alan Cox | feebed6 | 2008-10-13 10:41:30 +0100 | [diff] [blame] | 580 | .ioctl = pty_unix98_ioctl, |
Alan Cox | fc6f623 | 2009-01-02 13:43:17 +0000 | [diff] [blame] | 581 | .shutdown = pty_unix98_shutdown, |
| 582 | .resize = pty_resize |
Alan Cox | 3e8e88c | 2008-04-30 00:54:10 -0700 | [diff] [blame] | 583 | }; |
| 584 | |
Alan Cox | 99f1fe1 | 2008-10-13 10:42:00 +0100 | [diff] [blame] | 585 | static const struct tty_operations pty_unix98_ops = { |
| 586 | .lookup = pts_unix98_lookup, |
Alan Cox | bf970ee | 2008-10-13 10:42:39 +0100 | [diff] [blame] | 587 | .install = pty_unix98_install, |
Jiri Slaby | 484af54 | 2011-11-16 16:27:11 +0100 | [diff] [blame] | 588 | .remove = pts_unix98_remove, |
Alan Cox | 99f1fe1 | 2008-10-13 10:42:00 +0100 | [diff] [blame] | 589 | .open = pty_open, |
| 590 | .close = pty_close, |
| 591 | .write = pty_write, |
| 592 | .write_room = pty_write_room, |
| 593 | .flush_buffer = pty_flush_buffer, |
| 594 | .chars_in_buffer = pty_chars_in_buffer, |
| 595 | .unthrottle = pty_unthrottle, |
| 596 | .set_termios = pty_set_termios, |
Alan Cox | bf970ee | 2008-10-13 10:42:39 +0100 | [diff] [blame] | 597 | .shutdown = pty_unix98_shutdown |
Alan Cox | 99f1fe1 | 2008-10-13 10:42:00 +0100 | [diff] [blame] | 598 | }; |
Alan Cox | d81ed10 | 2008-10-13 10:41:42 +0100 | [diff] [blame] | 599 | |
| 600 | /** |
| 601 | * ptmx_open - open a unix 98 pty master |
| 602 | * @inode: inode of device file |
| 603 | * @filp: file pointer to tty |
| 604 | * |
| 605 | * Allocate a unix98 pty master device from the ptmx driver. |
| 606 | * |
| 607 | * Locking: tty_mutex protects the init_dev work. tty->count should |
| 608 | * protect the rest. |
| 609 | * allocated_ptys_lock handles the list of free pty numbers |
| 610 | */ |
| 611 | |
Arnd Bergmann | 64ba3dc | 2010-06-01 22:53:02 +0200 | [diff] [blame] | 612 | static int ptmx_open(struct inode *inode, struct file *filp) |
Alan Cox | d81ed10 | 2008-10-13 10:41:42 +0100 | [diff] [blame] | 613 | { |
| 614 | struct tty_struct *tty; |
| 615 | int retval; |
| 616 | int index; |
| 617 | |
| 618 | nonseekable_open(inode, filp); |
| 619 | |
Jiri Slaby | fa90e1c | 2011-10-12 11:32:43 +0200 | [diff] [blame] | 620 | retval = tty_alloc_file(filp); |
| 621 | if (retval) |
| 622 | return retval; |
| 623 | |
Alan Cox | d81ed10 | 2008-10-13 10:41:42 +0100 | [diff] [blame] | 624 | /* find a device that is not in use. */ |
Linus Torvalds | f309532 | 2012-06-02 15:21:43 -0700 | [diff] [blame^] | 625 | tty_lock(); |
Sukadev Bhattiprolu | 15f1a63 | 2008-10-13 10:42:59 +0100 | [diff] [blame] | 626 | index = devpts_new_index(inode); |
Linus Torvalds | f309532 | 2012-06-02 15:21:43 -0700 | [diff] [blame^] | 627 | tty_unlock(); |
Jiri Slaby | fa90e1c | 2011-10-12 11:32:43 +0200 | [diff] [blame] | 628 | if (index < 0) { |
| 629 | retval = index; |
| 630 | goto err_file; |
| 631 | } |
Alan Cox | d81ed10 | 2008-10-13 10:41:42 +0100 | [diff] [blame] | 632 | |
| 633 | mutex_lock(&tty_mutex); |
Linus Torvalds | f309532 | 2012-06-02 15:21:43 -0700 | [diff] [blame^] | 634 | mutex_lock(&devpts_mutex); |
Konstantin Khlebnikov | 593a27c | 2012-01-05 13:04:21 +0400 | [diff] [blame] | 635 | tty = tty_init_dev(ptm_driver, index); |
Linus Torvalds | f309532 | 2012-06-02 15:21:43 -0700 | [diff] [blame^] | 636 | mutex_unlock(&devpts_mutex); |
| 637 | tty_lock(); |
| 638 | mutex_unlock(&tty_mutex); |
Alan Cox | d81ed10 | 2008-10-13 10:41:42 +0100 | [diff] [blame] | 639 | |
Alan Cox | 73ec06f | 2008-10-13 10:42:29 +0100 | [diff] [blame] | 640 | if (IS_ERR(tty)) { |
| 641 | retval = PTR_ERR(tty); |
Alan Cox | d81ed10 | 2008-10-13 10:41:42 +0100 | [diff] [blame] | 642 | goto out; |
Alan Cox | 73ec06f | 2008-10-13 10:42:29 +0100 | [diff] [blame] | 643 | } |
Alan Cox | d81ed10 | 2008-10-13 10:41:42 +0100 | [diff] [blame] | 644 | |
| 645 | set_bit(TTY_PTY_LOCK, &tty->flags); /* LOCK THE SLAVE */ |
Nick Piggin | ee2ffa0 | 2010-08-18 04:37:35 +1000 | [diff] [blame] | 646 | |
Jiri Slaby | fa90e1c | 2011-10-12 11:32:43 +0200 | [diff] [blame] | 647 | tty_add_file(tty, filp); |
Alan Cox | d81ed10 | 2008-10-13 10:41:42 +0100 | [diff] [blame] | 648 | |
Sukadev Bhattiprolu | 15f1a63 | 2008-10-13 10:42:59 +0100 | [diff] [blame] | 649 | retval = devpts_pty_new(inode, tty->link); |
Alan Cox | d81ed10 | 2008-10-13 10:41:42 +0100 | [diff] [blame] | 650 | if (retval) |
Jiri Slaby | 1177c0e | 2011-10-12 11:32:44 +0200 | [diff] [blame] | 651 | goto err_release; |
Alan Cox | d81ed10 | 2008-10-13 10:41:42 +0100 | [diff] [blame] | 652 | |
| 653 | retval = ptm_driver->ops->open(tty, filp); |
Arnd Bergmann | 64ba3dc | 2010-06-01 22:53:02 +0200 | [diff] [blame] | 654 | if (retval) |
Jiri Slaby | 1177c0e | 2011-10-12 11:32:44 +0200 | [diff] [blame] | 655 | goto err_release; |
| 656 | |
Linus Torvalds | f309532 | 2012-06-02 15:21:43 -0700 | [diff] [blame^] | 657 | tty_unlock(); |
Jiri Slaby | 1177c0e | 2011-10-12 11:32:44 +0200 | [diff] [blame] | 658 | return 0; |
| 659 | err_release: |
Linus Torvalds | f309532 | 2012-06-02 15:21:43 -0700 | [diff] [blame^] | 660 | tty_unlock(); |
Alan Cox | eeb89d9 | 2009-11-30 13:18:29 +0000 | [diff] [blame] | 661 | tty_release(inode, filp); |
Alan Cox | d81ed10 | 2008-10-13 10:41:42 +0100 | [diff] [blame] | 662 | return retval; |
| 663 | out: |
Jiri Slaby | d3bda52 | 2012-01-30 21:14:32 +0100 | [diff] [blame] | 664 | devpts_kill_index(inode, index); |
Linus Torvalds | f309532 | 2012-06-02 15:21:43 -0700 | [diff] [blame^] | 665 | tty_unlock(); |
Jiri Slaby | fa90e1c | 2011-10-12 11:32:43 +0200 | [diff] [blame] | 666 | err_file: |
| 667 | tty_free_file(filp); |
Arnd Bergmann | 64ba3dc | 2010-06-01 22:53:02 +0200 | [diff] [blame] | 668 | return retval; |
Alan Cox | d81ed10 | 2008-10-13 10:41:42 +0100 | [diff] [blame] | 669 | } |
| 670 | |
| 671 | static struct file_operations ptmx_fops; |
| 672 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 673 | static void __init unix98_pty_init(void) |
| 674 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 675 | ptm_driver = alloc_tty_driver(NR_UNIX98_PTY_MAX); |
| 676 | if (!ptm_driver) |
| 677 | panic("Couldn't allocate Unix98 ptm driver"); |
| 678 | pts_driver = alloc_tty_driver(NR_UNIX98_PTY_MAX); |
| 679 | if (!pts_driver) |
| 680 | panic("Couldn't allocate Unix98 pts driver"); |
| 681 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 682 | ptm_driver->driver_name = "pty_master"; |
| 683 | ptm_driver->name = "ptm"; |
| 684 | ptm_driver->major = UNIX98_PTY_MASTER_MAJOR; |
| 685 | ptm_driver->minor_start = 0; |
| 686 | ptm_driver->type = TTY_DRIVER_TYPE_PTY; |
| 687 | ptm_driver->subtype = PTY_TYPE_MASTER; |
| 688 | ptm_driver->init_termios = tty_std_termios; |
| 689 | ptm_driver->init_termios.c_iflag = 0; |
| 690 | ptm_driver->init_termios.c_oflag = 0; |
| 691 | ptm_driver->init_termios.c_cflag = B38400 | CS8 | CREAD; |
| 692 | ptm_driver->init_termios.c_lflag = 0; |
Alan Cox | 606d099 | 2006-12-08 02:38:45 -0800 | [diff] [blame] | 693 | ptm_driver->init_termios.c_ispeed = 38400; |
| 694 | ptm_driver->init_termios.c_ospeed = 38400; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 695 | ptm_driver->flags = TTY_DRIVER_RESET_TERMIOS | TTY_DRIVER_REAL_RAW | |
Greg Kroah-Hartman | 331b831 | 2005-06-20 21:15:16 -0700 | [diff] [blame] | 696 | TTY_DRIVER_DYNAMIC_DEV | TTY_DRIVER_DEVPTS_MEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 697 | ptm_driver->other = pts_driver; |
Alan Cox | feebed6 | 2008-10-13 10:41:30 +0100 | [diff] [blame] | 698 | tty_set_operations(ptm_driver, &ptm_unix98_ops); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 699 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 700 | pts_driver->driver_name = "pty_slave"; |
| 701 | pts_driver->name = "pts"; |
| 702 | pts_driver->major = UNIX98_PTY_SLAVE_MAJOR; |
| 703 | pts_driver->minor_start = 0; |
| 704 | pts_driver->type = TTY_DRIVER_TYPE_PTY; |
| 705 | pts_driver->subtype = PTY_TYPE_SLAVE; |
| 706 | pts_driver->init_termios = tty_std_termios; |
| 707 | pts_driver->init_termios.c_cflag = B38400 | CS8 | CREAD; |
Alan Cox | 606d099 | 2006-12-08 02:38:45 -0800 | [diff] [blame] | 708 | pts_driver->init_termios.c_ispeed = 38400; |
| 709 | pts_driver->init_termios.c_ospeed = 38400; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 710 | pts_driver->flags = TTY_DRIVER_RESET_TERMIOS | TTY_DRIVER_REAL_RAW | |
Greg Kroah-Hartman | 331b831 | 2005-06-20 21:15:16 -0700 | [diff] [blame] | 711 | TTY_DRIVER_DYNAMIC_DEV | TTY_DRIVER_DEVPTS_MEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 712 | pts_driver->other = ptm_driver; |
Alan Cox | 99f1fe1 | 2008-10-13 10:42:00 +0100 | [diff] [blame] | 713 | tty_set_operations(pts_driver, &pty_unix98_ops); |
Alan Cox | fe9cd96 | 2008-10-13 10:43:38 +0100 | [diff] [blame] | 714 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 715 | if (tty_register_driver(ptm_driver)) |
| 716 | panic("Couldn't register Unix98 ptm driver"); |
| 717 | if (tty_register_driver(pts_driver)) |
| 718 | panic("Couldn't register Unix98 pts driver"); |
| 719 | |
Alan Cox | d81ed10 | 2008-10-13 10:41:42 +0100 | [diff] [blame] | 720 | /* Now create the /dev/ptmx special device */ |
| 721 | tty_default_fops(&ptmx_fops); |
| 722 | ptmx_fops.open = ptmx_open; |
| 723 | |
| 724 | cdev_init(&ptmx_cdev, &ptmx_fops); |
| 725 | if (cdev_add(&ptmx_cdev, MKDEV(TTYAUX_MAJOR, 2), 1) || |
| 726 | register_chrdev_region(MKDEV(TTYAUX_MAJOR, 2), 1, "/dev/ptmx") < 0) |
| 727 | panic("Couldn't register /dev/ptmx driver\n"); |
| 728 | device_create(tty_class, NULL, MKDEV(TTYAUX_MAJOR, 2), NULL, "ptmx"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 729 | } |
Alan Cox | d81ed10 | 2008-10-13 10:41:42 +0100 | [diff] [blame] | 730 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 731 | #else |
| 732 | static inline void unix98_pty_init(void) { } |
| 733 | #endif |
| 734 | |
| 735 | static int __init pty_init(void) |
| 736 | { |
| 737 | legacy_pty_init(); |
| 738 | unix98_pty_init(); |
| 739 | return 0; |
| 740 | } |
| 741 | module_init(pty_init); |