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 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 7 | */ |
| 8 | |
Alan Cox | fe9cd96 | 2008-10-13 10:43:38 +0100 | [diff] [blame] | 9 | #include <linux/module.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 10 | |
| 11 | #include <linux/errno.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 12 | #include <linux/interrupt.h> |
| 13 | #include <linux/tty.h> |
| 14 | #include <linux/tty_flip.h> |
| 15 | #include <linux/fcntl.h> |
Alexey Dobriyan | d43c36d | 2009-10-07 17:09:06 +0400 | [diff] [blame] | 16 | #include <linux/sched.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 17 | #include <linux/string.h> |
| 18 | #include <linux/major.h> |
| 19 | #include <linux/mm.h> |
| 20 | #include <linux/init.h> |
Alan Cox | d81ed10 | 2008-10-13 10:41:42 +0100 | [diff] [blame] | 21 | #include <linux/device.h> |
Alan Cox | fe9cd96 | 2008-10-13 10:43:38 +0100 | [diff] [blame] | 22 | #include <linux/uaccess.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 23 | #include <linux/bitops.h> |
| 24 | #include <linux/devpts_fs.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 25 | #include <linux/slab.h> |
Alan Cox | d739e65 | 2012-05-03 22:22:09 +0100 | [diff] [blame] | 26 | #include <linux/mutex.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 27 | |
Alan Cox | fe9cd96 | 2008-10-13 10:43:38 +0100 | [diff] [blame] | 28 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 29 | #ifdef CONFIG_UNIX98_PTYS |
Roel Kluin | da2bdf9 | 2009-01-07 18:09:15 -0800 | [diff] [blame] | 30 | static struct tty_driver *ptm_driver; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 31 | static struct tty_driver *pts_driver; |
Alan Cox | d739e65 | 2012-05-03 22:22:09 +0100 | [diff] [blame] | 32 | static DEFINE_MUTEX(devpts_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 33 | #endif |
| 34 | |
Alan Cox | fe9cd96 | 2008-10-13 10:43:38 +0100 | [diff] [blame] | 35 | static void pty_close(struct tty_struct *tty, struct file *filp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 36 | { |
Alan Cox | fe9cd96 | 2008-10-13 10:43:38 +0100 | [diff] [blame] | 37 | BUG_ON(!tty); |
| 38 | if (tty->driver->subtype == PTY_TYPE_MASTER) |
| 39 | WARN_ON(tty->count > 1); |
| 40 | else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 41 | if (tty->count > 2) |
| 42 | return; |
| 43 | } |
| 44 | wake_up_interruptible(&tty->read_wait); |
| 45 | wake_up_interruptible(&tty->write_wait); |
| 46 | tty->packet = 0; |
Alan Cox | 89c8d91 | 2012-08-08 16:30:13 +0100 | [diff] [blame] | 47 | /* Review - krefs on tty_link ?? */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 48 | if (!tty->link) |
| 49 | return; |
| 50 | tty->link->packet = 0; |
| 51 | set_bit(TTY_OTHER_CLOSED, &tty->link->flags); |
| 52 | wake_up_interruptible(&tty->link->read_wait); |
| 53 | wake_up_interruptible(&tty->link->write_wait); |
| 54 | if (tty->driver->subtype == PTY_TYPE_MASTER) { |
| 55 | set_bit(TTY_OTHER_CLOSED, &tty->flags); |
Greg Kroah-Hartman | ce1000d | 2012-02-24 13:56:36 -0800 | [diff] [blame] | 56 | #ifdef CONFIG_UNIX98_PTYS |
Alan Cox | d739e65 | 2012-05-03 22:22:09 +0100 | [diff] [blame] | 57 | if (tty->driver == ptm_driver) { |
| 58 | mutex_lock(&devpts_mutex); |
Jiri Slaby | f11afb6 | 2012-10-18 22:26:29 +0200 | [diff] [blame] | 59 | devpts_pty_kill(tty->link->driver_data); |
Alan Cox | d739e65 | 2012-05-03 22:22:09 +0100 | [diff] [blame] | 60 | mutex_unlock(&devpts_mutex); |
| 61 | } |
Greg Kroah-Hartman | ce1000d | 2012-02-24 13:56:36 -0800 | [diff] [blame] | 62 | #endif |
Alan Cox | 89c8d91 | 2012-08-08 16:30:13 +0100 | [diff] [blame] | 63 | tty_unlock(tty); |
Arnd Bergmann | 11dbf20 | 2010-06-18 14:58:07 +0200 | [diff] [blame] | 64 | tty_vhangup(tty->link); |
Alan Cox | 89c8d91 | 2012-08-08 16:30:13 +0100 | [diff] [blame] | 65 | tty_lock(tty); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 66 | } |
| 67 | } |
| 68 | |
| 69 | /* |
| 70 | * The unthrottle routine is called by the line discipline to signal |
| 71 | * that it can receive more characters. For PTY's, the TTY_THROTTLED |
| 72 | * 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] | 73 | * unthrottle routine when there are fewer than TTY_THRESHOLD_UNTHROTTLE |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 74 | * characters in the queue. This is necessary since each time this |
| 75 | * happens, we need to wake up any sleeping processes that could be |
| 76 | * (1) trying to send data to the pty, or (2) waiting in wait_until_sent() |
| 77 | * for the pty buffer to be drained. |
| 78 | */ |
Alan Cox | fe9cd96 | 2008-10-13 10:43:38 +0100 | [diff] [blame] | 79 | static void pty_unthrottle(struct tty_struct *tty) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 80 | { |
Alan Cox | d945cb9 | 2009-07-07 16:39:41 +0100 | [diff] [blame] | 81 | tty_wakeup(tty->link); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 82 | set_bit(TTY_THROTTLED, &tty->flags); |
| 83 | } |
| 84 | |
Alan Cox | d945cb9 | 2009-07-07 16:39:41 +0100 | [diff] [blame] | 85 | /** |
| 86 | * pty_space - report space left for writing |
| 87 | * @to: tty we are writing into |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 88 | * |
Alan Cox | d945cb9 | 2009-07-07 16:39:41 +0100 | [diff] [blame] | 89 | * The tty buffers allow 64K but we sneak a peak and clip at 8K this |
| 90 | * allows a lot of overspill room for echo and other fun messes to |
| 91 | * be handled properly |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 92 | */ |
Alan Cox | d945cb9 | 2009-07-07 16:39:41 +0100 | [diff] [blame] | 93 | |
| 94 | static int pty_space(struct tty_struct *to) |
| 95 | { |
Jiri Slaby | ecbbfd4 | 2012-10-18 22:26:47 +0200 | [diff] [blame] | 96 | int n = 8192 - to->port->buf.memory_used; |
Alan Cox | d945cb9 | 2009-07-07 16:39:41 +0100 | [diff] [blame] | 97 | if (n < 0) |
| 98 | return 0; |
| 99 | return n; |
| 100 | } |
| 101 | |
| 102 | /** |
| 103 | * pty_write - write to a pty |
| 104 | * @tty: the tty we write from |
| 105 | * @buf: kernel buffer of data |
| 106 | * @count: bytes to write |
| 107 | * |
| 108 | * Our "hardware" write method. Data is coming from the ldisc which |
| 109 | * may be in a non sleeping state. We simply throw this at the other |
| 110 | * end of the link as if we were an IRQ handler receiving stuff for |
| 111 | * the other side of the pty/tty pair. |
| 112 | */ |
| 113 | |
Linus Torvalds | ac89a91 | 2009-09-05 13:27:10 -0700 | [diff] [blame] | 114 | 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] | 115 | { |
| 116 | struct tty_struct *to = tty->link; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 117 | |
Alan Cox | d945cb9 | 2009-07-07 16:39:41 +0100 | [diff] [blame] | 118 | if (tty->stopped) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 119 | return 0; |
| 120 | |
Alan Cox | d945cb9 | 2009-07-07 16:39:41 +0100 | [diff] [blame] | 121 | if (c > 0) { |
| 122 | /* Stuff the data into the input queue of the other end */ |
| 123 | c = tty_insert_flip_string(to, buf, c); |
| 124 | /* And shovel */ |
Linus Torvalds | 202c467 | 2009-09-18 07:05:58 -0700 | [diff] [blame] | 125 | if (c) { |
| 126 | tty_flip_buffer_push(to); |
| 127 | tty_wakeup(tty); |
| 128 | } |
Alan Cox | 762faae | 2009-06-16 17:01:13 +0100 | [diff] [blame] | 129 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 130 | return c; |
| 131 | } |
| 132 | |
Alan Cox | d945cb9 | 2009-07-07 16:39:41 +0100 | [diff] [blame] | 133 | /** |
| 134 | * pty_write_room - write space |
| 135 | * @tty: tty we are writing from |
| 136 | * |
| 137 | * Report how many bytes the ldisc can send into the queue for |
| 138 | * the other device. |
| 139 | */ |
| 140 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 141 | static int pty_write_room(struct tty_struct *tty) |
| 142 | { |
Linus Torvalds | 85dfd81 | 2009-08-10 13:21:19 -0700 | [diff] [blame] | 143 | if (tty->stopped) |
| 144 | return 0; |
Alan Cox | d945cb9 | 2009-07-07 16:39:41 +0100 | [diff] [blame] | 145 | return pty_space(tty->link); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 146 | } |
| 147 | |
Alan Cox | d945cb9 | 2009-07-07 16:39:41 +0100 | [diff] [blame] | 148 | /** |
| 149 | * pty_chars_in_buffer - characters currently in our tx queue |
| 150 | * @tty: our tty |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 151 | * |
Alan Cox | d945cb9 | 2009-07-07 16:39:41 +0100 | [diff] [blame] | 152 | * Report how much we have in the transmit queue. As everything is |
| 153 | * instantly at the other end this is easy to implement. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 154 | */ |
Alan Cox | d945cb9 | 2009-07-07 16:39:41 +0100 | [diff] [blame] | 155 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 156 | static int pty_chars_in_buffer(struct tty_struct *tty) |
| 157 | { |
Alan Cox | d945cb9 | 2009-07-07 16:39:41 +0100 | [diff] [blame] | 158 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 159 | } |
| 160 | |
| 161 | /* Set the lock flag on a pty */ |
Alan Cox | fe9cd96 | 2008-10-13 10:43:38 +0100 | [diff] [blame] | 162 | static int pty_set_lock(struct tty_struct *tty, int __user *arg) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 163 | { |
| 164 | int val; |
Alan Cox | fe9cd96 | 2008-10-13 10:43:38 +0100 | [diff] [blame] | 165 | if (get_user(val, arg)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 166 | return -EFAULT; |
| 167 | if (val) |
| 168 | set_bit(TTY_PTY_LOCK, &tty->flags); |
| 169 | else |
| 170 | clear_bit(TTY_PTY_LOCK, &tty->flags); |
| 171 | return 0; |
| 172 | } |
| 173 | |
Cyrill Gorcunov | 06026d9 | 2012-10-24 23:43:20 +0400 | [diff] [blame] | 174 | /* Set the packet mode on a pty */ |
| 175 | static int pty_set_pktmode(struct tty_struct *tty, int __user *arg) |
| 176 | { |
| 177 | unsigned long flags; |
| 178 | int pktmode; |
| 179 | |
| 180 | if (get_user(pktmode, arg)) |
| 181 | return -EFAULT; |
| 182 | |
| 183 | spin_lock_irqsave(&tty->ctrl_lock, flags); |
| 184 | if (pktmode) { |
| 185 | if (!tty->packet) { |
| 186 | tty->packet = 1; |
| 187 | tty->link->ctrl_status = 0; |
| 188 | } |
| 189 | } else |
| 190 | tty->packet = 0; |
| 191 | spin_unlock_irqrestore(&tty->ctrl_lock, flags); |
| 192 | |
| 193 | return 0; |
| 194 | } |
| 195 | |
hyc@symas.com | 26df6d1 | 2010-06-22 10:14:49 -0700 | [diff] [blame] | 196 | /* Send a signal to the slave */ |
| 197 | static int pty_signal(struct tty_struct *tty, int sig) |
| 198 | { |
| 199 | unsigned long flags; |
| 200 | struct pid *pgrp; |
| 201 | |
| 202 | if (tty->link) { |
| 203 | spin_lock_irqsave(&tty->link->ctrl_lock, flags); |
| 204 | pgrp = get_pid(tty->link->pgrp); |
| 205 | spin_unlock_irqrestore(&tty->link->ctrl_lock, flags); |
| 206 | |
| 207 | kill_pgrp(pgrp, sig, 1); |
| 208 | put_pid(pgrp); |
| 209 | } |
| 210 | return 0; |
| 211 | } |
| 212 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 213 | static void pty_flush_buffer(struct tty_struct *tty) |
| 214 | { |
| 215 | struct tty_struct *to = tty->link; |
Alan Cox | 04f378b | 2008-04-30 00:53:29 -0700 | [diff] [blame] | 216 | unsigned long flags; |
Alan Cox | fe9cd96 | 2008-10-13 10:43:38 +0100 | [diff] [blame] | 217 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 218 | if (!to) |
| 219 | return; |
Alan Cox | d945cb9 | 2009-07-07 16:39:41 +0100 | [diff] [blame] | 220 | /* tty_buffer_flush(to); FIXME */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 221 | if (to->packet) { |
Alan Cox | 04f378b | 2008-04-30 00:53:29 -0700 | [diff] [blame] | 222 | spin_lock_irqsave(&tty->ctrl_lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 223 | tty->ctrl_status |= TIOCPKT_FLUSHWRITE; |
| 224 | wake_up_interruptible(&to->read_wait); |
Alan Cox | 04f378b | 2008-04-30 00:53:29 -0700 | [diff] [blame] | 225 | spin_unlock_irqrestore(&tty->ctrl_lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 226 | } |
| 227 | } |
| 228 | |
Alan Cox | fe9cd96 | 2008-10-13 10:43:38 +0100 | [diff] [blame] | 229 | static int pty_open(struct tty_struct *tty, struct file *filp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 230 | { |
| 231 | int retval = -ENODEV; |
| 232 | |
| 233 | if (!tty || !tty->link) |
| 234 | goto out; |
| 235 | |
| 236 | retval = -EIO; |
| 237 | if (test_bit(TTY_OTHER_CLOSED, &tty->flags)) |
| 238 | goto out; |
| 239 | if (test_bit(TTY_PTY_LOCK, &tty->link->flags)) |
| 240 | goto out; |
| 241 | if (tty->link->count != 1) |
| 242 | goto out; |
| 243 | |
| 244 | clear_bit(TTY_OTHER_CLOSED, &tty->link->flags); |
| 245 | set_bit(TTY_THROTTLED, &tty->flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 246 | retval = 0; |
| 247 | out: |
| 248 | return retval; |
| 249 | } |
| 250 | |
Alan Cox | fe9cd96 | 2008-10-13 10:43:38 +0100 | [diff] [blame] | 251 | static void pty_set_termios(struct tty_struct *tty, |
| 252 | struct ktermios *old_termios) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 253 | { |
Alan Cox | adc8d74 | 2012-07-14 15:31:47 +0100 | [diff] [blame] | 254 | tty->termios.c_cflag &= ~(CSIZE | PARENB); |
| 255 | tty->termios.c_cflag |= (CS8 | CREAD); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 256 | } |
| 257 | |
Alan Cox | fc6f623 | 2009-01-02 13:43:17 +0000 | [diff] [blame] | 258 | /** |
| 259 | * pty_do_resize - resize event |
| 260 | * @tty: tty being resized |
Alan Cox | c774bda | 2009-01-11 19:46:49 +0000 | [diff] [blame] | 261 | * @ws: window size being set. |
Alan Cox | fc6f623 | 2009-01-02 13:43:17 +0000 | [diff] [blame] | 262 | * |
Daniel Mack | 3ad2f3f | 2010-02-03 08:01:28 +0800 | [diff] [blame] | 263 | * Update the termios variables and send the necessary signals to |
Alan Cox | fc6f623 | 2009-01-02 13:43:17 +0000 | [diff] [blame] | 264 | * peform a terminal resize correctly |
| 265 | */ |
| 266 | |
| 267 | int pty_resize(struct tty_struct *tty, struct winsize *ws) |
| 268 | { |
| 269 | struct pid *pgrp, *rpgrp; |
| 270 | unsigned long flags; |
| 271 | struct tty_struct *pty = tty->link; |
| 272 | |
| 273 | /* For a PTY we need to lock the tty side */ |
| 274 | mutex_lock(&tty->termios_mutex); |
| 275 | if (!memcmp(ws, &tty->winsize, sizeof(*ws))) |
| 276 | goto done; |
| 277 | |
| 278 | /* Get the PID values and reference them so we can |
| 279 | avoid holding the tty ctrl lock while sending signals. |
| 280 | We need to lock these individually however. */ |
| 281 | |
| 282 | spin_lock_irqsave(&tty->ctrl_lock, flags); |
| 283 | pgrp = get_pid(tty->pgrp); |
| 284 | spin_unlock_irqrestore(&tty->ctrl_lock, flags); |
| 285 | |
| 286 | spin_lock_irqsave(&pty->ctrl_lock, flags); |
| 287 | rpgrp = get_pid(pty->pgrp); |
| 288 | spin_unlock_irqrestore(&pty->ctrl_lock, flags); |
| 289 | |
| 290 | if (pgrp) |
| 291 | kill_pgrp(pgrp, SIGWINCH, 1); |
| 292 | if (rpgrp != pgrp && rpgrp) |
| 293 | kill_pgrp(rpgrp, SIGWINCH, 1); |
| 294 | |
| 295 | put_pid(pgrp); |
| 296 | put_pid(rpgrp); |
| 297 | |
| 298 | tty->winsize = *ws; |
| 299 | pty->winsize = *ws; /* Never used so will go away soon */ |
| 300 | done: |
| 301 | mutex_unlock(&tty->termios_mutex); |
| 302 | return 0; |
| 303 | } |
| 304 | |
Alan Cox | d155255 | 2012-07-27 18:02:54 +0100 | [diff] [blame] | 305 | /** |
| 306 | * pty_common_install - set up the pty pair |
| 307 | * @driver: the pty driver |
| 308 | * @tty: the tty being instantiated |
| 309 | * @bool: legacy, true if this is BSD style |
| 310 | * |
| 311 | * Perform the initial set up for the tty/pty pair. Called from the |
| 312 | * tty layer when the port is first opened. |
| 313 | * |
| 314 | * Locking: the caller must hold the tty_mutex |
| 315 | */ |
Jiri Slaby | 5d249bc | 2012-06-04 13:35:29 +0200 | [diff] [blame] | 316 | static int pty_common_install(struct tty_driver *driver, struct tty_struct *tty, |
| 317 | bool legacy) |
Alan Cox | bf970ee | 2008-10-13 10:42:39 +0100 | [diff] [blame] | 318 | { |
| 319 | struct tty_struct *o_tty; |
Jiri Slaby | d03702a | 2012-06-04 13:35:30 +0200 | [diff] [blame] | 320 | struct tty_port *ports[2]; |
Alan Cox | bf970ee | 2008-10-13 10:42:39 +0100 | [diff] [blame] | 321 | int idx = tty->index; |
Jiri Slaby | 5d249bc | 2012-06-04 13:35:29 +0200 | [diff] [blame] | 322 | int retval = -ENOMEM; |
Alan Cox | bf970ee | 2008-10-13 10:42:39 +0100 | [diff] [blame] | 323 | |
| 324 | o_tty = alloc_tty_struct(); |
Jiri Slaby | 6f9ea7a | 2012-08-07 21:47:26 +0200 | [diff] [blame] | 325 | if (!o_tty) |
| 326 | goto err; |
Jiri Slaby | d03702a | 2012-06-04 13:35:30 +0200 | [diff] [blame] | 327 | ports[0] = kmalloc(sizeof **ports, GFP_KERNEL); |
| 328 | ports[1] = kmalloc(sizeof **ports, GFP_KERNEL); |
Jiri Slaby | 6f9ea7a | 2012-08-07 21:47:26 +0200 | [diff] [blame] | 329 | if (!ports[0] || !ports[1]) |
Jiri Slaby | d03702a | 2012-06-04 13:35:30 +0200 | [diff] [blame] | 330 | goto err_free_tty; |
Alan Cox | bf970ee | 2008-10-13 10:42:39 +0100 | [diff] [blame] | 331 | if (!try_module_get(driver->other->owner)) { |
| 332 | /* This cannot in fact currently happen */ |
Jiri Slaby | 8a1b8d7 | 2011-03-23 10:48:33 +0100 | [diff] [blame] | 333 | goto err_free_tty; |
Alan Cox | bf970ee | 2008-10-13 10:42:39 +0100 | [diff] [blame] | 334 | } |
| 335 | initialize_tty_struct(o_tty, driver->other, idx); |
| 336 | |
Jiri Slaby | 5d249bc | 2012-06-04 13:35:29 +0200 | [diff] [blame] | 337 | if (legacy) { |
| 338 | /* We always use new tty termios data so we can do this |
| 339 | the easy way .. */ |
| 340 | retval = tty_init_termios(tty); |
| 341 | if (retval) |
| 342 | goto err_deinit_tty; |
Alan Cox | bf970ee | 2008-10-13 10:42:39 +0100 | [diff] [blame] | 343 | |
Jiri Slaby | 5d249bc | 2012-06-04 13:35:29 +0200 | [diff] [blame] | 344 | retval = tty_init_termios(o_tty); |
| 345 | if (retval) |
| 346 | goto err_free_termios; |
| 347 | |
| 348 | driver->other->ttys[idx] = o_tty; |
| 349 | driver->ttys[idx] = tty; |
| 350 | } else { |
Alan Cox | adc8d74 | 2012-07-14 15:31:47 +0100 | [diff] [blame] | 351 | memset(&tty->termios_locked, 0, sizeof(tty->termios_locked)); |
| 352 | tty->termios = driver->init_termios; |
| 353 | memset(&o_tty->termios_locked, 0, sizeof(tty->termios_locked)); |
| 354 | o_tty->termios = driver->other->init_termios; |
Jiri Slaby | 5d249bc | 2012-06-04 13:35:29 +0200 | [diff] [blame] | 355 | } |
Alan Cox | fe9cd96 | 2008-10-13 10:43:38 +0100 | [diff] [blame] | 356 | |
Alan Cox | bf970ee | 2008-10-13 10:42:39 +0100 | [diff] [blame] | 357 | /* |
| 358 | * Everything allocated ... set up the o_tty structure. |
| 359 | */ |
Alan Cox | bf970ee | 2008-10-13 10:42:39 +0100 | [diff] [blame] | 360 | tty_driver_kref_get(driver->other); |
| 361 | if (driver->subtype == PTY_TYPE_MASTER) |
| 362 | o_tty->count++; |
| 363 | /* Establish the links in both directions */ |
| 364 | tty->link = o_tty; |
| 365 | o_tty->link = tty; |
Jiri Slaby | d03702a | 2012-06-04 13:35:30 +0200 | [diff] [blame] | 366 | tty_port_init(ports[0]); |
| 367 | tty_port_init(ports[1]); |
| 368 | o_tty->port = ports[0]; |
| 369 | tty->port = ports[1]; |
Jiri Slaby | 967fab6 | 2012-10-18 22:26:46 +0200 | [diff] [blame] | 370 | o_tty->port->itty = o_tty; |
Alan Cox | bf970ee | 2008-10-13 10:42:39 +0100 | [diff] [blame] | 371 | |
| 372 | tty_driver_kref_get(driver); |
| 373 | tty->count++; |
Alan Cox | bf970ee | 2008-10-13 10:42:39 +0100 | [diff] [blame] | 374 | return 0; |
Jiri Slaby | 8a1b8d7 | 2011-03-23 10:48:33 +0100 | [diff] [blame] | 375 | err_free_termios: |
Jiri Slaby | 5d249bc | 2012-06-04 13:35:29 +0200 | [diff] [blame] | 376 | if (legacy) |
| 377 | tty_free_termios(tty); |
Jiri Slaby | a9dccdd | 2011-03-23 10:48:36 +0100 | [diff] [blame] | 378 | err_deinit_tty: |
| 379 | deinitialize_tty_struct(o_tty); |
Alan Cox | bf970ee | 2008-10-13 10:42:39 +0100 | [diff] [blame] | 380 | module_put(o_tty->driver->owner); |
Jiri Slaby | 8a1b8d7 | 2011-03-23 10:48:33 +0100 | [diff] [blame] | 381 | err_free_tty: |
Jiri Slaby | d03702a | 2012-06-04 13:35:30 +0200 | [diff] [blame] | 382 | kfree(ports[0]); |
| 383 | kfree(ports[1]); |
Alan Cox | bf970ee | 2008-10-13 10:42:39 +0100 | [diff] [blame] | 384 | free_tty_struct(o_tty); |
Jiri Slaby | 6f9ea7a | 2012-08-07 21:47:26 +0200 | [diff] [blame] | 385 | err: |
Jiri Slaby | 8a1b8d7 | 2011-03-23 10:48:33 +0100 | [diff] [blame] | 386 | return retval; |
Alan Cox | bf970ee | 2008-10-13 10:42:39 +0100 | [diff] [blame] | 387 | } |
| 388 | |
Jiri Slaby | fa2ecfc5a | 2012-10-18 22:26:31 +0200 | [diff] [blame] | 389 | /* this is called once with whichever end is closed last */ |
| 390 | static void pty_unix98_shutdown(struct tty_struct *tty) |
| 391 | { |
| 392 | devpts_kill_index(tty->driver_data, tty->index); |
| 393 | } |
| 394 | |
Jiri Slaby | d03702a | 2012-06-04 13:35:30 +0200 | [diff] [blame] | 395 | static void pty_cleanup(struct tty_struct *tty) |
| 396 | { |
Jiri Slaby | 967fab6 | 2012-10-18 22:26:46 +0200 | [diff] [blame] | 397 | tty->port->itty = NULL; |
Jiri Slaby | d03702a | 2012-06-04 13:35:30 +0200 | [diff] [blame] | 398 | kfree(tty->port); |
| 399 | } |
| 400 | |
Jiri Slaby | 5d249bc | 2012-06-04 13:35:29 +0200 | [diff] [blame] | 401 | /* Traditional BSD devices */ |
| 402 | #ifdef CONFIG_LEGACY_PTYS |
| 403 | |
| 404 | static int pty_install(struct tty_driver *driver, struct tty_struct *tty) |
| 405 | { |
| 406 | return pty_common_install(driver, tty, true); |
| 407 | } |
| 408 | |
Alan Cox | d155255 | 2012-07-27 18:02:54 +0100 | [diff] [blame] | 409 | static void pty_remove(struct tty_driver *driver, struct tty_struct *tty) |
| 410 | { |
| 411 | struct tty_struct *pair = tty->link; |
| 412 | driver->ttys[tty->index] = NULL; |
| 413 | if (pair) |
| 414 | pair->driver->ttys[pair->index] = NULL; |
| 415 | } |
| 416 | |
Alan Cox | 6caa76b | 2011-02-14 16:27:22 +0000 | [diff] [blame] | 417 | static int pty_bsd_ioctl(struct tty_struct *tty, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 418 | unsigned int cmd, unsigned long arg) |
| 419 | { |
| 420 | switch (cmd) { |
| 421 | case TIOCSPTLCK: /* Set PT Lock (disallow slave open) */ |
| 422 | return pty_set_lock(tty, (int __user *) arg); |
Cyrill Gorcunov | 06026d9 | 2012-10-24 23:43:20 +0400 | [diff] [blame] | 423 | case TIOCPKT: /* Set PT packet mode */ |
| 424 | return pty_set_pktmode(tty, (int __user *)arg); |
hyc@symas.com | 26df6d1 | 2010-06-22 10:14:49 -0700 | [diff] [blame] | 425 | case TIOCSIG: /* Send signal to other side of pty */ |
| 426 | return pty_signal(tty, (int) arg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 427 | } |
| 428 | return -ENOIOCTLCMD; |
| 429 | } |
| 430 | |
Kay Sievers | dc8c858 | 2007-08-15 12:25:38 +0200 | [diff] [blame] | 431 | static int legacy_count = CONFIG_LEGACY_PTY_COUNT; |
| 432 | module_param(legacy_count, int, 0); |
| 433 | |
Linus Torvalds | 342a597 | 2009-09-30 07:49:40 -0700 | [diff] [blame] | 434 | /* |
| 435 | * The master side of a pty can do TIOCSPTLCK and thus |
| 436 | * has pty_bsd_ioctl. |
| 437 | */ |
| 438 | static const struct tty_operations master_pty_ops_bsd = { |
| 439 | .install = pty_install, |
Alan Cox | 3e8e88c | 2008-04-30 00:54:10 -0700 | [diff] [blame] | 440 | .open = pty_open, |
| 441 | .close = pty_close, |
| 442 | .write = pty_write, |
| 443 | .write_room = pty_write_room, |
| 444 | .flush_buffer = pty_flush_buffer, |
| 445 | .chars_in_buffer = pty_chars_in_buffer, |
| 446 | .unthrottle = pty_unthrottle, |
| 447 | .set_termios = pty_set_termios, |
| 448 | .ioctl = pty_bsd_ioctl, |
Jiri Slaby | d03702a | 2012-06-04 13:35:30 +0200 | [diff] [blame] | 449 | .cleanup = pty_cleanup, |
Alan Cox | d155255 | 2012-07-27 18:02:54 +0100 | [diff] [blame] | 450 | .resize = pty_resize, |
| 451 | .remove = pty_remove |
Alan Cox | 3e8e88c | 2008-04-30 00:54:10 -0700 | [diff] [blame] | 452 | }; |
| 453 | |
Linus Torvalds | 342a597 | 2009-09-30 07:49:40 -0700 | [diff] [blame] | 454 | static const struct tty_operations slave_pty_ops_bsd = { |
| 455 | .install = pty_install, |
| 456 | .open = pty_open, |
| 457 | .close = pty_close, |
| 458 | .write = pty_write, |
| 459 | .write_room = pty_write_room, |
| 460 | .flush_buffer = pty_flush_buffer, |
| 461 | .chars_in_buffer = pty_chars_in_buffer, |
| 462 | .unthrottle = pty_unthrottle, |
| 463 | .set_termios = pty_set_termios, |
Jiri Slaby | d03702a | 2012-06-04 13:35:30 +0200 | [diff] [blame] | 464 | .cleanup = pty_cleanup, |
Alan Cox | d155255 | 2012-07-27 18:02:54 +0100 | [diff] [blame] | 465 | .resize = pty_resize, |
| 466 | .remove = pty_remove |
Linus Torvalds | 342a597 | 2009-09-30 07:49:40 -0700 | [diff] [blame] | 467 | }; |
| 468 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 469 | static void __init legacy_pty_init(void) |
| 470 | { |
Linus Torvalds | 342a597 | 2009-09-30 07:49:40 -0700 | [diff] [blame] | 471 | struct tty_driver *pty_driver, *pty_slave_driver; |
| 472 | |
Kay Sievers | dc8c858 | 2007-08-15 12:25:38 +0200 | [diff] [blame] | 473 | if (legacy_count <= 0) |
| 474 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 475 | |
Jiri Slaby | 21aca2f | 2012-08-08 22:26:41 +0200 | [diff] [blame] | 476 | pty_driver = tty_alloc_driver(legacy_count, |
| 477 | TTY_DRIVER_RESET_TERMIOS | |
| 478 | TTY_DRIVER_REAL_RAW | |
| 479 | TTY_DRIVER_DYNAMIC_ALLOC); |
Dan Carpenter | c3a6344 | 2012-08-16 16:16:56 +0300 | [diff] [blame] | 480 | if (IS_ERR(pty_driver)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 481 | panic("Couldn't allocate pty driver"); |
| 482 | |
Jiri Slaby | 21aca2f | 2012-08-08 22:26:41 +0200 | [diff] [blame] | 483 | pty_slave_driver = tty_alloc_driver(legacy_count, |
| 484 | TTY_DRIVER_RESET_TERMIOS | |
| 485 | TTY_DRIVER_REAL_RAW | |
| 486 | TTY_DRIVER_DYNAMIC_ALLOC); |
Dan Carpenter | c3a6344 | 2012-08-16 16:16:56 +0300 | [diff] [blame] | 487 | if (IS_ERR(pty_slave_driver)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 488 | panic("Couldn't allocate pty slave driver"); |
| 489 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 490 | pty_driver->driver_name = "pty_master"; |
| 491 | pty_driver->name = "pty"; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 492 | pty_driver->major = PTY_MASTER_MAJOR; |
| 493 | pty_driver->minor_start = 0; |
| 494 | pty_driver->type = TTY_DRIVER_TYPE_PTY; |
| 495 | pty_driver->subtype = PTY_TYPE_MASTER; |
| 496 | pty_driver->init_termios = tty_std_termios; |
| 497 | pty_driver->init_termios.c_iflag = 0; |
| 498 | pty_driver->init_termios.c_oflag = 0; |
| 499 | pty_driver->init_termios.c_cflag = B38400 | CS8 | CREAD; |
| 500 | pty_driver->init_termios.c_lflag = 0; |
Alan Cox | 606d099 | 2006-12-08 02:38:45 -0800 | [diff] [blame] | 501 | pty_driver->init_termios.c_ispeed = 38400; |
| 502 | pty_driver->init_termios.c_ospeed = 38400; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 503 | pty_driver->other = pty_slave_driver; |
Linus Torvalds | 342a597 | 2009-09-30 07:49:40 -0700 | [diff] [blame] | 504 | tty_set_operations(pty_driver, &master_pty_ops_bsd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 505 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 506 | pty_slave_driver->driver_name = "pty_slave"; |
| 507 | pty_slave_driver->name = "ttyp"; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 508 | pty_slave_driver->major = PTY_SLAVE_MAJOR; |
| 509 | pty_slave_driver->minor_start = 0; |
| 510 | pty_slave_driver->type = TTY_DRIVER_TYPE_PTY; |
| 511 | pty_slave_driver->subtype = PTY_TYPE_SLAVE; |
| 512 | pty_slave_driver->init_termios = tty_std_termios; |
| 513 | pty_slave_driver->init_termios.c_cflag = B38400 | CS8 | CREAD; |
Alan Cox | 606d099 | 2006-12-08 02:38:45 -0800 | [diff] [blame] | 514 | pty_slave_driver->init_termios.c_ispeed = 38400; |
| 515 | pty_slave_driver->init_termios.c_ospeed = 38400; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 516 | pty_slave_driver->other = pty_driver; |
Linus Torvalds | 342a597 | 2009-09-30 07:49:40 -0700 | [diff] [blame] | 517 | tty_set_operations(pty_slave_driver, &slave_pty_ops_bsd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 518 | |
| 519 | if (tty_register_driver(pty_driver)) |
| 520 | panic("Couldn't register pty driver"); |
| 521 | if (tty_register_driver(pty_slave_driver)) |
| 522 | panic("Couldn't register pty slave driver"); |
| 523 | } |
| 524 | #else |
| 525 | static inline void legacy_pty_init(void) { } |
| 526 | #endif |
| 527 | |
| 528 | /* Unix98 devices */ |
| 529 | #ifdef CONFIG_UNIX98_PTYS |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 530 | |
Alan Cox | d81ed10 | 2008-10-13 10:41:42 +0100 | [diff] [blame] | 531 | static struct cdev ptmx_cdev; |
| 532 | |
Alan Cox | 6caa76b | 2011-02-14 16:27:22 +0000 | [diff] [blame] | 533 | static int pty_unix98_ioctl(struct tty_struct *tty, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 534 | unsigned int cmd, unsigned long arg) |
| 535 | { |
| 536 | switch (cmd) { |
| 537 | case TIOCSPTLCK: /* Set PT Lock (disallow slave open) */ |
| 538 | return pty_set_lock(tty, (int __user *)arg); |
Cyrill Gorcunov | 06026d9 | 2012-10-24 23:43:20 +0400 | [diff] [blame] | 539 | case TIOCPKT: /* Set PT packet mode */ |
| 540 | return pty_set_pktmode(tty, (int __user *)arg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 541 | case TIOCGPTN: /* Get PT Number */ |
| 542 | return put_user(tty->index, (unsigned int __user *)arg); |
hyc@symas.com | 26df6d1 | 2010-06-22 10:14:49 -0700 | [diff] [blame] | 543 | case TIOCSIG: /* Send signal to other side of pty */ |
| 544 | return pty_signal(tty, (int) arg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 545 | } |
| 546 | |
| 547 | return -ENOIOCTLCMD; |
| 548 | } |
| 549 | |
Alan Cox | 99f1fe1 | 2008-10-13 10:42:00 +0100 | [diff] [blame] | 550 | /** |
| 551 | * ptm_unix98_lookup - find a pty master |
| 552 | * @driver: ptm driver |
| 553 | * @idx: tty index |
| 554 | * |
| 555 | * Look up a pty master device. Called under the tty_mutex for now. |
| 556 | * This provides our locking. |
| 557 | */ |
| 558 | |
Sukadev Bhattiprolu | 15f1a63 | 2008-10-13 10:42:59 +0100 | [diff] [blame] | 559 | static struct tty_struct *ptm_unix98_lookup(struct tty_driver *driver, |
| 560 | struct inode *ptm_inode, int idx) |
Alan Cox | 99f1fe1 | 2008-10-13 10:42:00 +0100 | [diff] [blame] | 561 | { |
Konstantin Khlebnikov | 593a27c | 2012-01-05 13:04:21 +0400 | [diff] [blame] | 562 | /* Master must be open via /dev/ptmx */ |
| 563 | return ERR_PTR(-EIO); |
Alan Cox | 99f1fe1 | 2008-10-13 10:42:00 +0100 | [diff] [blame] | 564 | } |
| 565 | |
| 566 | /** |
| 567 | * pts_unix98_lookup - find a pty slave |
| 568 | * @driver: pts driver |
| 569 | * @idx: tty index |
| 570 | * |
| 571 | * 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] | 572 | * This provides our locking for the tty pointer. |
Alan Cox | 99f1fe1 | 2008-10-13 10:42:00 +0100 | [diff] [blame] | 573 | */ |
| 574 | |
Sukadev Bhattiprolu | 15f1a63 | 2008-10-13 10:42:59 +0100 | [diff] [blame] | 575 | static struct tty_struct *pts_unix98_lookup(struct tty_driver *driver, |
| 576 | struct inode *pts_inode, int idx) |
Alan Cox | 99f1fe1 | 2008-10-13 10:42:00 +0100 | [diff] [blame] | 577 | { |
Alan Cox | d739e65 | 2012-05-03 22:22:09 +0100 | [diff] [blame] | 578 | struct tty_struct *tty; |
| 579 | |
| 580 | mutex_lock(&devpts_mutex); |
Jiri Slaby | 8fcbaa2 | 2012-10-18 22:26:27 +0200 | [diff] [blame] | 581 | tty = devpts_get_priv(pts_inode); |
Alan Cox | d739e65 | 2012-05-03 22:22:09 +0100 | [diff] [blame] | 582 | mutex_unlock(&devpts_mutex); |
Alan Cox | 99f1fe1 | 2008-10-13 10:42:00 +0100 | [diff] [blame] | 583 | /* Master must be open before slave */ |
| 584 | if (!tty) |
| 585 | return ERR_PTR(-EIO); |
| 586 | return tty; |
| 587 | } |
| 588 | |
Alan Cox | 8b0a88d | 2008-10-13 10:42:19 +0100 | [diff] [blame] | 589 | /* We have no need to install and remove our tty objects as devpts does all |
| 590 | the work for us */ |
| 591 | |
Alan Cox | bf970ee | 2008-10-13 10:42:39 +0100 | [diff] [blame] | 592 | 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] | 593 | { |
Jiri Slaby | 5d249bc | 2012-06-04 13:35:29 +0200 | [diff] [blame] | 594 | return pty_common_install(driver, tty, false); |
Alan Cox | 8b0a88d | 2008-10-13 10:42:19 +0100 | [diff] [blame] | 595 | } |
| 596 | |
Jiri Slaby | 7171604 | 2012-06-04 13:35:28 +0200 | [diff] [blame] | 597 | static void pty_unix98_remove(struct tty_driver *driver, struct tty_struct *tty) |
Jiri Slaby | 484af54 | 2011-11-16 16:27:11 +0100 | [diff] [blame] | 598 | { |
Alan Cox | 8b0a88d | 2008-10-13 10:42:19 +0100 | [diff] [blame] | 599 | } |
| 600 | |
Alan Cox | feebed6 | 2008-10-13 10:41:30 +0100 | [diff] [blame] | 601 | static const struct tty_operations ptm_unix98_ops = { |
Alan Cox | 99f1fe1 | 2008-10-13 10:42:00 +0100 | [diff] [blame] | 602 | .lookup = ptm_unix98_lookup, |
Alan Cox | bf970ee | 2008-10-13 10:42:39 +0100 | [diff] [blame] | 603 | .install = pty_unix98_install, |
Jiri Slaby | 7171604 | 2012-06-04 13:35:28 +0200 | [diff] [blame] | 604 | .remove = pty_unix98_remove, |
Alan Cox | 3e8e88c | 2008-04-30 00:54:10 -0700 | [diff] [blame] | 605 | .open = pty_open, |
| 606 | .close = pty_close, |
| 607 | .write = pty_write, |
| 608 | .write_room = pty_write_room, |
| 609 | .flush_buffer = pty_flush_buffer, |
| 610 | .chars_in_buffer = pty_chars_in_buffer, |
| 611 | .unthrottle = pty_unthrottle, |
| 612 | .set_termios = pty_set_termios, |
Alan Cox | feebed6 | 2008-10-13 10:41:30 +0100 | [diff] [blame] | 613 | .ioctl = pty_unix98_ioctl, |
Alan Cox | 36b3c07 | 2012-07-17 17:06:57 +0100 | [diff] [blame] | 614 | .resize = pty_resize, |
Jiri Slaby | fa2ecfc5a | 2012-10-18 22:26:31 +0200 | [diff] [blame] | 615 | .shutdown = pty_unix98_shutdown, |
Alan Cox | 36b3c07 | 2012-07-17 17:06:57 +0100 | [diff] [blame] | 616 | .cleanup = pty_cleanup |
Alan Cox | 3e8e88c | 2008-04-30 00:54:10 -0700 | [diff] [blame] | 617 | }; |
| 618 | |
Alan Cox | 99f1fe1 | 2008-10-13 10:42:00 +0100 | [diff] [blame] | 619 | static const struct tty_operations pty_unix98_ops = { |
| 620 | .lookup = pts_unix98_lookup, |
Alan Cox | bf970ee | 2008-10-13 10:42:39 +0100 | [diff] [blame] | 621 | .install = pty_unix98_install, |
Jiri Slaby | 7171604 | 2012-06-04 13:35:28 +0200 | [diff] [blame] | 622 | .remove = pty_unix98_remove, |
Alan Cox | 99f1fe1 | 2008-10-13 10:42:00 +0100 | [diff] [blame] | 623 | .open = pty_open, |
| 624 | .close = pty_close, |
| 625 | .write = pty_write, |
| 626 | .write_room = pty_write_room, |
| 627 | .flush_buffer = pty_flush_buffer, |
| 628 | .chars_in_buffer = pty_chars_in_buffer, |
| 629 | .unthrottle = pty_unthrottle, |
| 630 | .set_termios = pty_set_termios, |
Jiri Slaby | fa2ecfc5a | 2012-10-18 22:26:31 +0200 | [diff] [blame] | 631 | .shutdown = pty_unix98_shutdown, |
Jiri Slaby | d03702a | 2012-06-04 13:35:30 +0200 | [diff] [blame] | 632 | .cleanup = pty_cleanup, |
Alan Cox | 99f1fe1 | 2008-10-13 10:42:00 +0100 | [diff] [blame] | 633 | }; |
Alan Cox | d81ed10 | 2008-10-13 10:41:42 +0100 | [diff] [blame] | 634 | |
| 635 | /** |
| 636 | * ptmx_open - open a unix 98 pty master |
| 637 | * @inode: inode of device file |
| 638 | * @filp: file pointer to tty |
| 639 | * |
| 640 | * Allocate a unix98 pty master device from the ptmx driver. |
| 641 | * |
| 642 | * Locking: tty_mutex protects the init_dev work. tty->count should |
| 643 | * protect the rest. |
| 644 | * allocated_ptys_lock handles the list of free pty numbers |
| 645 | */ |
| 646 | |
Arnd Bergmann | 64ba3dc | 2010-06-01 22:53:02 +0200 | [diff] [blame] | 647 | static int ptmx_open(struct inode *inode, struct file *filp) |
Alan Cox | d81ed10 | 2008-10-13 10:41:42 +0100 | [diff] [blame] | 648 | { |
| 649 | struct tty_struct *tty; |
Jiri Slaby | 162b97c | 2012-10-18 22:26:28 +0200 | [diff] [blame] | 650 | struct inode *slave_inode; |
Alan Cox | d81ed10 | 2008-10-13 10:41:42 +0100 | [diff] [blame] | 651 | int retval; |
| 652 | int index; |
| 653 | |
| 654 | nonseekable_open(inode, filp); |
| 655 | |
Jiri Slaby | fa90e1c | 2011-10-12 11:32:43 +0200 | [diff] [blame] | 656 | retval = tty_alloc_file(filp); |
| 657 | if (retval) |
| 658 | return retval; |
| 659 | |
Alan Cox | d81ed10 | 2008-10-13 10:41:42 +0100 | [diff] [blame] | 660 | /* find a device that is not in use. */ |
Alan Cox | 89c8d91 | 2012-08-08 16:30:13 +0100 | [diff] [blame] | 661 | mutex_lock(&devpts_mutex); |
Sukadev Bhattiprolu | 15f1a63 | 2008-10-13 10:42:59 +0100 | [diff] [blame] | 662 | index = devpts_new_index(inode); |
Jiri Slaby | fa90e1c | 2011-10-12 11:32:43 +0200 | [diff] [blame] | 663 | if (index < 0) { |
| 664 | retval = index; |
Alan Cox | 05fb79e | 2012-09-19 15:34:47 +0100 | [diff] [blame] | 665 | mutex_unlock(&devpts_mutex); |
Jiri Slaby | fa90e1c | 2011-10-12 11:32:43 +0200 | [diff] [blame] | 666 | goto err_file; |
| 667 | } |
Alan Cox | d81ed10 | 2008-10-13 10:41:42 +0100 | [diff] [blame] | 668 | |
Alan Cox | 6d31a88 | 2012-07-14 15:31:27 +0100 | [diff] [blame] | 669 | mutex_unlock(&devpts_mutex); |
Alan Cox | 89c8d91 | 2012-08-08 16:30:13 +0100 | [diff] [blame] | 670 | |
| 671 | mutex_lock(&tty_mutex); |
| 672 | tty = tty_init_dev(ptm_driver, index); |
Alan Cox | d81ed10 | 2008-10-13 10:41:42 +0100 | [diff] [blame] | 673 | |
Alan Cox | 73ec06f | 2008-10-13 10:42:29 +0100 | [diff] [blame] | 674 | if (IS_ERR(tty)) { |
| 675 | retval = PTR_ERR(tty); |
Alan Cox | d81ed10 | 2008-10-13 10:41:42 +0100 | [diff] [blame] | 676 | goto out; |
Alan Cox | 73ec06f | 2008-10-13 10:42:29 +0100 | [diff] [blame] | 677 | } |
Alan Cox | d81ed10 | 2008-10-13 10:41:42 +0100 | [diff] [blame] | 678 | |
Alan Cox | 89c8d91 | 2012-08-08 16:30:13 +0100 | [diff] [blame] | 679 | /* The tty returned here is locked so we can safely |
| 680 | drop the mutex */ |
| 681 | mutex_unlock(&tty_mutex); |
| 682 | |
Alan Cox | d81ed10 | 2008-10-13 10:41:42 +0100 | [diff] [blame] | 683 | set_bit(TTY_PTY_LOCK, &tty->flags); /* LOCK THE SLAVE */ |
Nick Piggin | ee2ffa0 | 2010-08-18 04:37:35 +1000 | [diff] [blame] | 684 | |
Jiri Slaby | fa90e1c | 2011-10-12 11:32:43 +0200 | [diff] [blame] | 685 | tty_add_file(tty, filp); |
Alan Cox | d81ed10 | 2008-10-13 10:41:42 +0100 | [diff] [blame] | 686 | |
Jiri Slaby | f11afb6 | 2012-10-18 22:26:29 +0200 | [diff] [blame] | 687 | slave_inode = devpts_pty_new(inode, |
| 688 | MKDEV(UNIX98_PTY_SLAVE_MAJOR, index), index, |
| 689 | tty->link); |
Jiri Slaby | 162b97c | 2012-10-18 22:26:28 +0200 | [diff] [blame] | 690 | if (IS_ERR(slave_inode)) { |
| 691 | retval = PTR_ERR(slave_inode); |
Jiri Slaby | 1177c0e | 2011-10-12 11:32:44 +0200 | [diff] [blame] | 692 | goto err_release; |
Jiri Slaby | 162b97c | 2012-10-18 22:26:28 +0200 | [diff] [blame] | 693 | } |
Alan Cox | d81ed10 | 2008-10-13 10:41:42 +0100 | [diff] [blame] | 694 | |
| 695 | retval = ptm_driver->ops->open(tty, filp); |
Arnd Bergmann | 64ba3dc | 2010-06-01 22:53:02 +0200 | [diff] [blame] | 696 | if (retval) |
Jiri Slaby | 1177c0e | 2011-10-12 11:32:44 +0200 | [diff] [blame] | 697 | goto err_release; |
| 698 | |
Alan Cox | 89c8d91 | 2012-08-08 16:30:13 +0100 | [diff] [blame] | 699 | tty_unlock(tty); |
Jiri Slaby | fa2ecfc5a | 2012-10-18 22:26:31 +0200 | [diff] [blame] | 700 | tty->driver_data = inode; |
Jiri Slaby | f11afb6 | 2012-10-18 22:26:29 +0200 | [diff] [blame] | 701 | tty->link->driver_data = slave_inode; |
Jiri Slaby | 1177c0e | 2011-10-12 11:32:44 +0200 | [diff] [blame] | 702 | return 0; |
| 703 | err_release: |
Alan Cox | 89c8d91 | 2012-08-08 16:30:13 +0100 | [diff] [blame] | 704 | tty_unlock(tty); |
Alan Cox | eeb89d9 | 2009-11-30 13:18:29 +0000 | [diff] [blame] | 705 | tty_release(inode, filp); |
Alan Cox | d81ed10 | 2008-10-13 10:41:42 +0100 | [diff] [blame] | 706 | return retval; |
| 707 | out: |
Alan Cox | 89c8d91 | 2012-08-08 16:30:13 +0100 | [diff] [blame] | 708 | mutex_unlock(&tty_mutex); |
Jiri Slaby | d3bda52 | 2012-01-30 21:14:32 +0100 | [diff] [blame] | 709 | devpts_kill_index(inode, index); |
Jiri Slaby | fa90e1c | 2011-10-12 11:32:43 +0200 | [diff] [blame] | 710 | err_file: |
| 711 | tty_free_file(filp); |
Arnd Bergmann | 64ba3dc | 2010-06-01 22:53:02 +0200 | [diff] [blame] | 712 | return retval; |
Alan Cox | d81ed10 | 2008-10-13 10:41:42 +0100 | [diff] [blame] | 713 | } |
| 714 | |
| 715 | static struct file_operations ptmx_fops; |
| 716 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 717 | static void __init unix98_pty_init(void) |
| 718 | { |
Jiri Slaby | 21aca2f | 2012-08-08 22:26:41 +0200 | [diff] [blame] | 719 | ptm_driver = tty_alloc_driver(NR_UNIX98_PTY_MAX, |
| 720 | TTY_DRIVER_RESET_TERMIOS | |
| 721 | TTY_DRIVER_REAL_RAW | |
| 722 | TTY_DRIVER_DYNAMIC_DEV | |
| 723 | TTY_DRIVER_DEVPTS_MEM | |
| 724 | TTY_DRIVER_DYNAMIC_ALLOC); |
Dan Carpenter | c3a6344 | 2012-08-16 16:16:56 +0300 | [diff] [blame] | 725 | if (IS_ERR(ptm_driver)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 726 | panic("Couldn't allocate Unix98 ptm driver"); |
Jiri Slaby | 21aca2f | 2012-08-08 22:26:41 +0200 | [diff] [blame] | 727 | pts_driver = tty_alloc_driver(NR_UNIX98_PTY_MAX, |
| 728 | TTY_DRIVER_RESET_TERMIOS | |
| 729 | TTY_DRIVER_REAL_RAW | |
| 730 | TTY_DRIVER_DYNAMIC_DEV | |
| 731 | TTY_DRIVER_DEVPTS_MEM | |
| 732 | TTY_DRIVER_DYNAMIC_ALLOC); |
Dan Carpenter | c3a6344 | 2012-08-16 16:16:56 +0300 | [diff] [blame] | 733 | if (IS_ERR(pts_driver)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 734 | panic("Couldn't allocate Unix98 pts driver"); |
| 735 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 736 | ptm_driver->driver_name = "pty_master"; |
| 737 | ptm_driver->name = "ptm"; |
| 738 | ptm_driver->major = UNIX98_PTY_MASTER_MAJOR; |
| 739 | ptm_driver->minor_start = 0; |
| 740 | ptm_driver->type = TTY_DRIVER_TYPE_PTY; |
| 741 | ptm_driver->subtype = PTY_TYPE_MASTER; |
| 742 | ptm_driver->init_termios = tty_std_termios; |
| 743 | ptm_driver->init_termios.c_iflag = 0; |
| 744 | ptm_driver->init_termios.c_oflag = 0; |
| 745 | ptm_driver->init_termios.c_cflag = B38400 | CS8 | CREAD; |
| 746 | ptm_driver->init_termios.c_lflag = 0; |
Alan Cox | 606d099 | 2006-12-08 02:38:45 -0800 | [diff] [blame] | 747 | ptm_driver->init_termios.c_ispeed = 38400; |
| 748 | ptm_driver->init_termios.c_ospeed = 38400; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 749 | ptm_driver->other = pts_driver; |
Alan Cox | feebed6 | 2008-10-13 10:41:30 +0100 | [diff] [blame] | 750 | tty_set_operations(ptm_driver, &ptm_unix98_ops); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 751 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 752 | pts_driver->driver_name = "pty_slave"; |
| 753 | pts_driver->name = "pts"; |
| 754 | pts_driver->major = UNIX98_PTY_SLAVE_MAJOR; |
| 755 | pts_driver->minor_start = 0; |
| 756 | pts_driver->type = TTY_DRIVER_TYPE_PTY; |
| 757 | pts_driver->subtype = PTY_TYPE_SLAVE; |
| 758 | pts_driver->init_termios = tty_std_termios; |
| 759 | pts_driver->init_termios.c_cflag = B38400 | CS8 | CREAD; |
Alan Cox | 606d099 | 2006-12-08 02:38:45 -0800 | [diff] [blame] | 760 | pts_driver->init_termios.c_ispeed = 38400; |
| 761 | pts_driver->init_termios.c_ospeed = 38400; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 762 | pts_driver->other = ptm_driver; |
Alan Cox | 99f1fe1 | 2008-10-13 10:42:00 +0100 | [diff] [blame] | 763 | tty_set_operations(pts_driver, &pty_unix98_ops); |
Alan Cox | fe9cd96 | 2008-10-13 10:43:38 +0100 | [diff] [blame] | 764 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 765 | if (tty_register_driver(ptm_driver)) |
| 766 | panic("Couldn't register Unix98 ptm driver"); |
| 767 | if (tty_register_driver(pts_driver)) |
| 768 | panic("Couldn't register Unix98 pts driver"); |
| 769 | |
Alan Cox | d81ed10 | 2008-10-13 10:41:42 +0100 | [diff] [blame] | 770 | /* Now create the /dev/ptmx special device */ |
| 771 | tty_default_fops(&ptmx_fops); |
| 772 | ptmx_fops.open = ptmx_open; |
| 773 | |
| 774 | cdev_init(&ptmx_cdev, &ptmx_fops); |
| 775 | if (cdev_add(&ptmx_cdev, MKDEV(TTYAUX_MAJOR, 2), 1) || |
| 776 | register_chrdev_region(MKDEV(TTYAUX_MAJOR, 2), 1, "/dev/ptmx") < 0) |
| 777 | panic("Couldn't register /dev/ptmx driver\n"); |
| 778 | device_create(tty_class, NULL, MKDEV(TTYAUX_MAJOR, 2), NULL, "ptmx"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 779 | } |
Alan Cox | d81ed10 | 2008-10-13 10:41:42 +0100 | [diff] [blame] | 780 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 781 | #else |
| 782 | static inline void unix98_pty_init(void) { } |
| 783 | #endif |
| 784 | |
| 785 | static int __init pty_init(void) |
| 786 | { |
| 787 | legacy_pty_init(); |
| 788 | unix98_pty_init(); |
| 789 | return 0; |
| 790 | } |
| 791 | module_init(pty_init); |