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 { |
Peter Hurley | 6993903 | 2013-01-30 12:43:50 -0500 | [diff] [blame] | 41 | if (test_bit(TTY_IO_ERROR, &tty->flags)) |
| 42 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 43 | if (tty->count > 2) |
| 44 | return; |
| 45 | } |
Peter Hurley | 6993903 | 2013-01-30 12:43:50 -0500 | [diff] [blame] | 46 | set_bit(TTY_IO_ERROR, &tty->flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 47 | wake_up_interruptible(&tty->read_wait); |
| 48 | wake_up_interruptible(&tty->write_wait); |
| 49 | tty->packet = 0; |
Alan Cox | 89c8d91 | 2012-08-08 16:30:13 +0100 | [diff] [blame] | 50 | /* Review - krefs on tty_link ?? */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 51 | if (!tty->link) |
| 52 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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) { |
Cong Ding | b9f8033 | 2013-01-12 05:01:22 +0100 | [diff] [blame] | 60 | mutex_lock(&devpts_mutex); |
Peter Hurley | 7acf6cd | 2013-01-30 12:43:49 -0500 | [diff] [blame] | 61 | if (tty->link->driver_data) |
| 62 | devpts_pty_kill(tty->link->driver_data); |
Cong Ding | b9f8033 | 2013-01-12 05:01:22 +0100 | [diff] [blame] | 63 | mutex_unlock(&devpts_mutex); |
Alan Cox | d739e65 | 2012-05-03 22:22:09 +0100 | [diff] [blame] | 64 | } |
Greg Kroah-Hartman | ce1000d | 2012-02-24 13:56:36 -0800 | [diff] [blame] | 65 | #endif |
Alan Cox | 89c8d91 | 2012-08-08 16:30:13 +0100 | [diff] [blame] | 66 | tty_unlock(tty); |
Arnd Bergmann | 11dbf20 | 2010-06-18 14:58:07 +0200 | [diff] [blame] | 67 | tty_vhangup(tty->link); |
Alan Cox | 89c8d91 | 2012-08-08 16:30:13 +0100 | [diff] [blame] | 68 | tty_lock(tty); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 69 | } |
| 70 | } |
| 71 | |
| 72 | /* |
| 73 | * The unthrottle routine is called by the line discipline to signal |
| 74 | * that it can receive more characters. For PTY's, the TTY_THROTTLED |
| 75 | * 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] | 76 | * unthrottle routine when there are fewer than TTY_THRESHOLD_UNTHROTTLE |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 77 | * characters in the queue. This is necessary since each time this |
| 78 | * happens, we need to wake up any sleeping processes that could be |
| 79 | * (1) trying to send data to the pty, or (2) waiting in wait_until_sent() |
| 80 | * for the pty buffer to be drained. |
| 81 | */ |
Alan Cox | fe9cd96 | 2008-10-13 10:43:38 +0100 | [diff] [blame] | 82 | static void pty_unthrottle(struct tty_struct *tty) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 83 | { |
Alan Cox | d945cb9 | 2009-07-07 16:39:41 +0100 | [diff] [blame] | 84 | tty_wakeup(tty->link); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 85 | set_bit(TTY_THROTTLED, &tty->flags); |
| 86 | } |
| 87 | |
Alan Cox | d945cb9 | 2009-07-07 16:39:41 +0100 | [diff] [blame] | 88 | /** |
| 89 | * pty_space - report space left for writing |
| 90 | * @to: tty we are writing into |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 91 | * |
Alan Cox | d945cb9 | 2009-07-07 16:39:41 +0100 | [diff] [blame] | 92 | * The tty buffers allow 64K but we sneak a peak and clip at 8K this |
| 93 | * allows a lot of overspill room for echo and other fun messes to |
| 94 | * be handled properly |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 95 | */ |
Alan Cox | d945cb9 | 2009-07-07 16:39:41 +0100 | [diff] [blame] | 96 | |
| 97 | static int pty_space(struct tty_struct *to) |
| 98 | { |
Jiri Slaby | ecbbfd4 | 2012-10-18 22:26:47 +0200 | [diff] [blame] | 99 | int n = 8192 - to->port->buf.memory_used; |
Alan Cox | d945cb9 | 2009-07-07 16:39:41 +0100 | [diff] [blame] | 100 | if (n < 0) |
| 101 | return 0; |
| 102 | return n; |
| 103 | } |
| 104 | |
| 105 | /** |
| 106 | * pty_write - write to a pty |
| 107 | * @tty: the tty we write from |
| 108 | * @buf: kernel buffer of data |
| 109 | * @count: bytes to write |
| 110 | * |
| 111 | * Our "hardware" write method. Data is coming from the ldisc which |
| 112 | * may be in a non sleeping state. We simply throw this at the other |
| 113 | * end of the link as if we were an IRQ handler receiving stuff for |
| 114 | * the other side of the pty/tty pair. |
| 115 | */ |
| 116 | |
Linus Torvalds | ac89a91 | 2009-09-05 13:27:10 -0700 | [diff] [blame] | 117 | 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] | 118 | { |
| 119 | struct tty_struct *to = tty->link; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 120 | |
Alan Cox | d945cb9 | 2009-07-07 16:39:41 +0100 | [diff] [blame] | 121 | if (tty->stopped) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 122 | return 0; |
| 123 | |
Alan Cox | d945cb9 | 2009-07-07 16:39:41 +0100 | [diff] [blame] | 124 | if (c > 0) { |
| 125 | /* Stuff the data into the input queue of the other end */ |
Jiri Slaby | 05c7cd3 | 2013-01-03 15:53:04 +0100 | [diff] [blame] | 126 | c = tty_insert_flip_string(to->port, buf, c); |
Alan Cox | d945cb9 | 2009-07-07 16:39:41 +0100 | [diff] [blame] | 127 | /* And shovel */ |
Linus Torvalds | 202c467 | 2009-09-18 07:05:58 -0700 | [diff] [blame] | 128 | if (c) { |
Jiri Slaby | 2e124b4 | 2013-01-03 15:53:06 +0100 | [diff] [blame] | 129 | tty_flip_buffer_push(to->port); |
Linus Torvalds | 202c467 | 2009-09-18 07:05:58 -0700 | [diff] [blame] | 130 | tty_wakeup(tty); |
| 131 | } |
Alan Cox | 762faae | 2009-06-16 17:01:13 +0100 | [diff] [blame] | 132 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 133 | return c; |
| 134 | } |
| 135 | |
Alan Cox | d945cb9 | 2009-07-07 16:39:41 +0100 | [diff] [blame] | 136 | /** |
| 137 | * pty_write_room - write space |
| 138 | * @tty: tty we are writing from |
| 139 | * |
| 140 | * Report how many bytes the ldisc can send into the queue for |
| 141 | * the other device. |
| 142 | */ |
| 143 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 144 | static int pty_write_room(struct tty_struct *tty) |
| 145 | { |
Linus Torvalds | 85dfd81 | 2009-08-10 13:21:19 -0700 | [diff] [blame] | 146 | if (tty->stopped) |
| 147 | return 0; |
Alan Cox | d945cb9 | 2009-07-07 16:39:41 +0100 | [diff] [blame] | 148 | return pty_space(tty->link); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 149 | } |
| 150 | |
Alan Cox | d945cb9 | 2009-07-07 16:39:41 +0100 | [diff] [blame] | 151 | /** |
| 152 | * pty_chars_in_buffer - characters currently in our tx queue |
| 153 | * @tty: our tty |
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 | * Report how much we have in the transmit queue. As everything is |
| 156 | * instantly at the other end this is easy to implement. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 157 | */ |
Alan Cox | d945cb9 | 2009-07-07 16:39:41 +0100 | [diff] [blame] | 158 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 159 | static int pty_chars_in_buffer(struct tty_struct *tty) |
| 160 | { |
Alan Cox | d945cb9 | 2009-07-07 16:39:41 +0100 | [diff] [blame] | 161 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 162 | } |
| 163 | |
| 164 | /* Set the lock flag on a pty */ |
Alan Cox | fe9cd96 | 2008-10-13 10:43:38 +0100 | [diff] [blame] | 165 | static int pty_set_lock(struct tty_struct *tty, int __user *arg) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 166 | { |
| 167 | int val; |
Alan Cox | fe9cd96 | 2008-10-13 10:43:38 +0100 | [diff] [blame] | 168 | if (get_user(val, arg)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 169 | return -EFAULT; |
| 170 | if (val) |
| 171 | set_bit(TTY_PTY_LOCK, &tty->flags); |
| 172 | else |
| 173 | clear_bit(TTY_PTY_LOCK, &tty->flags); |
| 174 | return 0; |
| 175 | } |
| 176 | |
Cyrill Gorcunov | 84fd7bd | 2012-10-24 23:43:22 +0400 | [diff] [blame] | 177 | static int pty_get_lock(struct tty_struct *tty, int __user *arg) |
| 178 | { |
| 179 | int locked = test_bit(TTY_PTY_LOCK, &tty->flags); |
| 180 | return put_user(locked, arg); |
| 181 | } |
| 182 | |
Cyrill Gorcunov | 06026d9 | 2012-10-24 23:43:20 +0400 | [diff] [blame] | 183 | /* Set the packet mode on a pty */ |
| 184 | static int pty_set_pktmode(struct tty_struct *tty, int __user *arg) |
| 185 | { |
| 186 | unsigned long flags; |
| 187 | int pktmode; |
| 188 | |
| 189 | if (get_user(pktmode, arg)) |
| 190 | return -EFAULT; |
| 191 | |
| 192 | spin_lock_irqsave(&tty->ctrl_lock, flags); |
| 193 | if (pktmode) { |
| 194 | if (!tty->packet) { |
| 195 | tty->packet = 1; |
| 196 | tty->link->ctrl_status = 0; |
| 197 | } |
| 198 | } else |
| 199 | tty->packet = 0; |
| 200 | spin_unlock_irqrestore(&tty->ctrl_lock, flags); |
| 201 | |
| 202 | return 0; |
| 203 | } |
| 204 | |
Cyrill Gorcunov | 84fd7bd | 2012-10-24 23:43:22 +0400 | [diff] [blame] | 205 | /* Get the packet mode of a pty */ |
| 206 | static int pty_get_pktmode(struct tty_struct *tty, int __user *arg) |
| 207 | { |
| 208 | int pktmode = tty->packet; |
| 209 | return put_user(pktmode, arg); |
| 210 | } |
| 211 | |
hyc@symas.com | 26df6d1 | 2010-06-22 10:14:49 -0700 | [diff] [blame] | 212 | /* Send a signal to the slave */ |
| 213 | static int pty_signal(struct tty_struct *tty, int sig) |
| 214 | { |
| 215 | unsigned long flags; |
| 216 | struct pid *pgrp; |
| 217 | |
| 218 | if (tty->link) { |
| 219 | spin_lock_irqsave(&tty->link->ctrl_lock, flags); |
| 220 | pgrp = get_pid(tty->link->pgrp); |
| 221 | spin_unlock_irqrestore(&tty->link->ctrl_lock, flags); |
| 222 | |
| 223 | kill_pgrp(pgrp, sig, 1); |
| 224 | put_pid(pgrp); |
| 225 | } |
| 226 | return 0; |
| 227 | } |
| 228 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 229 | static void pty_flush_buffer(struct tty_struct *tty) |
| 230 | { |
| 231 | struct tty_struct *to = tty->link; |
Alan Cox | 04f378b | 2008-04-30 00:53:29 -0700 | [diff] [blame] | 232 | unsigned long flags; |
Alan Cox | fe9cd96 | 2008-10-13 10:43:38 +0100 | [diff] [blame] | 233 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 234 | if (!to) |
| 235 | return; |
Alan Cox | d945cb9 | 2009-07-07 16:39:41 +0100 | [diff] [blame] | 236 | /* tty_buffer_flush(to); FIXME */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 237 | if (to->packet) { |
Alan Cox | 04f378b | 2008-04-30 00:53:29 -0700 | [diff] [blame] | 238 | spin_lock_irqsave(&tty->ctrl_lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 239 | tty->ctrl_status |= TIOCPKT_FLUSHWRITE; |
| 240 | wake_up_interruptible(&to->read_wait); |
Alan Cox | 04f378b | 2008-04-30 00:53:29 -0700 | [diff] [blame] | 241 | spin_unlock_irqrestore(&tty->ctrl_lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 242 | } |
| 243 | } |
| 244 | |
Alan Cox | fe9cd96 | 2008-10-13 10:43:38 +0100 | [diff] [blame] | 245 | static int pty_open(struct tty_struct *tty, struct file *filp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 246 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 247 | if (!tty || !tty->link) |
Peter Hurley | 7c61c3d | 2013-06-13 15:56:37 -0400 | [diff] [blame] | 248 | return -ENODEV; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 249 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 250 | if (test_bit(TTY_OTHER_CLOSED, &tty->flags)) |
| 251 | goto out; |
| 252 | if (test_bit(TTY_PTY_LOCK, &tty->link->flags)) |
| 253 | goto out; |
Peter Hurley | 80cace7 | 2013-01-30 12:43:52 -0500 | [diff] [blame] | 254 | if (tty->driver->subtype == PTY_TYPE_SLAVE && tty->link->count != 1) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 255 | goto out; |
| 256 | |
Peter Hurley | 6993903 | 2013-01-30 12:43:50 -0500 | [diff] [blame] | 257 | clear_bit(TTY_IO_ERROR, &tty->flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 258 | clear_bit(TTY_OTHER_CLOSED, &tty->link->flags); |
| 259 | set_bit(TTY_THROTTLED, &tty->flags); |
Peter Hurley | 7c61c3d | 2013-06-13 15:56:37 -0400 | [diff] [blame] | 260 | return 0; |
| 261 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 262 | out: |
Peter Hurley | 7c61c3d | 2013-06-13 15:56:37 -0400 | [diff] [blame] | 263 | set_bit(TTY_IO_ERROR, &tty->flags); |
| 264 | return -EIO; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 265 | } |
| 266 | |
Alan Cox | fe9cd96 | 2008-10-13 10:43:38 +0100 | [diff] [blame] | 267 | static void pty_set_termios(struct tty_struct *tty, |
| 268 | struct ktermios *old_termios) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 269 | { |
Alan Cox | adc8d74 | 2012-07-14 15:31:47 +0100 | [diff] [blame] | 270 | tty->termios.c_cflag &= ~(CSIZE | PARENB); |
| 271 | tty->termios.c_cflag |= (CS8 | CREAD); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 272 | } |
| 273 | |
Alan Cox | fc6f623 | 2009-01-02 13:43:17 +0000 | [diff] [blame] | 274 | /** |
| 275 | * pty_do_resize - resize event |
| 276 | * @tty: tty being resized |
Alan Cox | c774bda | 2009-01-11 19:46:49 +0000 | [diff] [blame] | 277 | * @ws: window size being set. |
Alan Cox | fc6f623 | 2009-01-02 13:43:17 +0000 | [diff] [blame] | 278 | * |
Daniel Mack | 3ad2f3f | 2010-02-03 08:01:28 +0800 | [diff] [blame] | 279 | * Update the termios variables and send the necessary signals to |
Alan Cox | fc6f623 | 2009-01-02 13:43:17 +0000 | [diff] [blame] | 280 | * peform a terminal resize correctly |
| 281 | */ |
| 282 | |
Josh Triplett | 159a8e9 | 2012-11-18 21:27:40 -0800 | [diff] [blame] | 283 | static int pty_resize(struct tty_struct *tty, struct winsize *ws) |
Alan Cox | fc6f623 | 2009-01-02 13:43:17 +0000 | [diff] [blame] | 284 | { |
| 285 | struct pid *pgrp, *rpgrp; |
| 286 | unsigned long flags; |
| 287 | struct tty_struct *pty = tty->link; |
| 288 | |
| 289 | /* For a PTY we need to lock the tty side */ |
| 290 | mutex_lock(&tty->termios_mutex); |
| 291 | if (!memcmp(ws, &tty->winsize, sizeof(*ws))) |
| 292 | goto done; |
| 293 | |
| 294 | /* Get the PID values and reference them so we can |
| 295 | avoid holding the tty ctrl lock while sending signals. |
| 296 | We need to lock these individually however. */ |
| 297 | |
| 298 | spin_lock_irqsave(&tty->ctrl_lock, flags); |
| 299 | pgrp = get_pid(tty->pgrp); |
| 300 | spin_unlock_irqrestore(&tty->ctrl_lock, flags); |
| 301 | |
| 302 | spin_lock_irqsave(&pty->ctrl_lock, flags); |
| 303 | rpgrp = get_pid(pty->pgrp); |
| 304 | spin_unlock_irqrestore(&pty->ctrl_lock, flags); |
| 305 | |
| 306 | if (pgrp) |
| 307 | kill_pgrp(pgrp, SIGWINCH, 1); |
| 308 | if (rpgrp != pgrp && rpgrp) |
| 309 | kill_pgrp(rpgrp, SIGWINCH, 1); |
| 310 | |
| 311 | put_pid(pgrp); |
| 312 | put_pid(rpgrp); |
| 313 | |
| 314 | tty->winsize = *ws; |
| 315 | pty->winsize = *ws; /* Never used so will go away soon */ |
| 316 | done: |
| 317 | mutex_unlock(&tty->termios_mutex); |
| 318 | return 0; |
| 319 | } |
| 320 | |
Alan Cox | d155255 | 2012-07-27 18:02:54 +0100 | [diff] [blame] | 321 | /** |
| 322 | * pty_common_install - set up the pty pair |
| 323 | * @driver: the pty driver |
| 324 | * @tty: the tty being instantiated |
| 325 | * @bool: legacy, true if this is BSD style |
| 326 | * |
| 327 | * Perform the initial set up for the tty/pty pair. Called from the |
| 328 | * tty layer when the port is first opened. |
| 329 | * |
| 330 | * Locking: the caller must hold the tty_mutex |
| 331 | */ |
Jiri Slaby | 5d249bc | 2012-06-04 13:35:29 +0200 | [diff] [blame] | 332 | static int pty_common_install(struct tty_driver *driver, struct tty_struct *tty, |
| 333 | bool legacy) |
Alan Cox | bf970ee | 2008-10-13 10:42:39 +0100 | [diff] [blame] | 334 | { |
| 335 | struct tty_struct *o_tty; |
Jiri Slaby | d03702a | 2012-06-04 13:35:30 +0200 | [diff] [blame] | 336 | struct tty_port *ports[2]; |
Alan Cox | bf970ee | 2008-10-13 10:42:39 +0100 | [diff] [blame] | 337 | int idx = tty->index; |
Jiri Slaby | 5d249bc | 2012-06-04 13:35:29 +0200 | [diff] [blame] | 338 | int retval = -ENOMEM; |
Alan Cox | bf970ee | 2008-10-13 10:42:39 +0100 | [diff] [blame] | 339 | |
| 340 | o_tty = alloc_tty_struct(); |
Jiri Slaby | 6f9ea7a | 2012-08-07 21:47:26 +0200 | [diff] [blame] | 341 | if (!o_tty) |
| 342 | goto err; |
Jiri Slaby | d03702a | 2012-06-04 13:35:30 +0200 | [diff] [blame] | 343 | ports[0] = kmalloc(sizeof **ports, GFP_KERNEL); |
| 344 | ports[1] = kmalloc(sizeof **ports, GFP_KERNEL); |
Jiri Slaby | 6f9ea7a | 2012-08-07 21:47:26 +0200 | [diff] [blame] | 345 | if (!ports[0] || !ports[1]) |
Jiri Slaby | d03702a | 2012-06-04 13:35:30 +0200 | [diff] [blame] | 346 | goto err_free_tty; |
Alan Cox | bf970ee | 2008-10-13 10:42:39 +0100 | [diff] [blame] | 347 | if (!try_module_get(driver->other->owner)) { |
| 348 | /* This cannot in fact currently happen */ |
Jiri Slaby | 8a1b8d7 | 2011-03-23 10:48:33 +0100 | [diff] [blame] | 349 | goto err_free_tty; |
Alan Cox | bf970ee | 2008-10-13 10:42:39 +0100 | [diff] [blame] | 350 | } |
| 351 | initialize_tty_struct(o_tty, driver->other, idx); |
| 352 | |
Jiri Slaby | 5d249bc | 2012-06-04 13:35:29 +0200 | [diff] [blame] | 353 | if (legacy) { |
| 354 | /* We always use new tty termios data so we can do this |
| 355 | the easy way .. */ |
| 356 | retval = tty_init_termios(tty); |
| 357 | if (retval) |
| 358 | goto err_deinit_tty; |
Alan Cox | bf970ee | 2008-10-13 10:42:39 +0100 | [diff] [blame] | 359 | |
Jiri Slaby | 5d249bc | 2012-06-04 13:35:29 +0200 | [diff] [blame] | 360 | retval = tty_init_termios(o_tty); |
| 361 | if (retval) |
| 362 | goto err_free_termios; |
| 363 | |
| 364 | driver->other->ttys[idx] = o_tty; |
| 365 | driver->ttys[idx] = tty; |
| 366 | } else { |
Alan Cox | adc8d74 | 2012-07-14 15:31:47 +0100 | [diff] [blame] | 367 | memset(&tty->termios_locked, 0, sizeof(tty->termios_locked)); |
| 368 | tty->termios = driver->init_termios; |
| 369 | memset(&o_tty->termios_locked, 0, sizeof(tty->termios_locked)); |
| 370 | o_tty->termios = driver->other->init_termios; |
Jiri Slaby | 5d249bc | 2012-06-04 13:35:29 +0200 | [diff] [blame] | 371 | } |
Alan Cox | fe9cd96 | 2008-10-13 10:43:38 +0100 | [diff] [blame] | 372 | |
Alan Cox | bf970ee | 2008-10-13 10:42:39 +0100 | [diff] [blame] | 373 | /* |
| 374 | * Everything allocated ... set up the o_tty structure. |
| 375 | */ |
Alan Cox | bf970ee | 2008-10-13 10:42:39 +0100 | [diff] [blame] | 376 | tty_driver_kref_get(driver->other); |
| 377 | if (driver->subtype == PTY_TYPE_MASTER) |
| 378 | o_tty->count++; |
| 379 | /* Establish the links in both directions */ |
| 380 | tty->link = o_tty; |
| 381 | o_tty->link = tty; |
Jiri Slaby | d03702a | 2012-06-04 13:35:30 +0200 | [diff] [blame] | 382 | tty_port_init(ports[0]); |
| 383 | tty_port_init(ports[1]); |
| 384 | o_tty->port = ports[0]; |
| 385 | tty->port = ports[1]; |
Jiri Slaby | 967fab6 | 2012-10-18 22:26:46 +0200 | [diff] [blame] | 386 | o_tty->port->itty = o_tty; |
Alan Cox | bf970ee | 2008-10-13 10:42:39 +0100 | [diff] [blame] | 387 | |
| 388 | tty_driver_kref_get(driver); |
| 389 | tty->count++; |
Alan Cox | bf970ee | 2008-10-13 10:42:39 +0100 | [diff] [blame] | 390 | return 0; |
Jiri Slaby | 8a1b8d7 | 2011-03-23 10:48:33 +0100 | [diff] [blame] | 391 | err_free_termios: |
Jiri Slaby | 5d249bc | 2012-06-04 13:35:29 +0200 | [diff] [blame] | 392 | if (legacy) |
| 393 | tty_free_termios(tty); |
Jiri Slaby | a9dccdd | 2011-03-23 10:48:36 +0100 | [diff] [blame] | 394 | err_deinit_tty: |
| 395 | deinitialize_tty_struct(o_tty); |
Alan Cox | bf970ee | 2008-10-13 10:42:39 +0100 | [diff] [blame] | 396 | module_put(o_tty->driver->owner); |
Jiri Slaby | 8a1b8d7 | 2011-03-23 10:48:33 +0100 | [diff] [blame] | 397 | err_free_tty: |
Jiri Slaby | d03702a | 2012-06-04 13:35:30 +0200 | [diff] [blame] | 398 | kfree(ports[0]); |
| 399 | kfree(ports[1]); |
Alan Cox | bf970ee | 2008-10-13 10:42:39 +0100 | [diff] [blame] | 400 | free_tty_struct(o_tty); |
Jiri Slaby | 6f9ea7a | 2012-08-07 21:47:26 +0200 | [diff] [blame] | 401 | err: |
Jiri Slaby | 8a1b8d7 | 2011-03-23 10:48:33 +0100 | [diff] [blame] | 402 | return retval; |
Alan Cox | bf970ee | 2008-10-13 10:42:39 +0100 | [diff] [blame] | 403 | } |
| 404 | |
Jiri Slaby | d03702a | 2012-06-04 13:35:30 +0200 | [diff] [blame] | 405 | static void pty_cleanup(struct tty_struct *tty) |
| 406 | { |
Jiri Slaby | 81c7983 | 2012-11-15 09:49:49 +0100 | [diff] [blame] | 407 | tty_port_put(tty->port); |
Jiri Slaby | d03702a | 2012-06-04 13:35:30 +0200 | [diff] [blame] | 408 | } |
| 409 | |
Jiri Slaby | 5d249bc | 2012-06-04 13:35:29 +0200 | [diff] [blame] | 410 | /* Traditional BSD devices */ |
| 411 | #ifdef CONFIG_LEGACY_PTYS |
| 412 | |
| 413 | static int pty_install(struct tty_driver *driver, struct tty_struct *tty) |
| 414 | { |
| 415 | return pty_common_install(driver, tty, true); |
| 416 | } |
| 417 | |
Alan Cox | d155255 | 2012-07-27 18:02:54 +0100 | [diff] [blame] | 418 | static void pty_remove(struct tty_driver *driver, struct tty_struct *tty) |
| 419 | { |
| 420 | struct tty_struct *pair = tty->link; |
| 421 | driver->ttys[tty->index] = NULL; |
| 422 | if (pair) |
| 423 | pair->driver->ttys[pair->index] = NULL; |
| 424 | } |
| 425 | |
Alan Cox | 6caa76b | 2011-02-14 16:27:22 +0000 | [diff] [blame] | 426 | static int pty_bsd_ioctl(struct tty_struct *tty, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 427 | unsigned int cmd, unsigned long arg) |
| 428 | { |
| 429 | switch (cmd) { |
| 430 | case TIOCSPTLCK: /* Set PT Lock (disallow slave open) */ |
| 431 | return pty_set_lock(tty, (int __user *) arg); |
Cyrill Gorcunov | 84fd7bd | 2012-10-24 23:43:22 +0400 | [diff] [blame] | 432 | case TIOCGPTLCK: /* Get PT Lock status */ |
| 433 | return pty_get_lock(tty, (int __user *)arg); |
Cyrill Gorcunov | 06026d9 | 2012-10-24 23:43:20 +0400 | [diff] [blame] | 434 | case TIOCPKT: /* Set PT packet mode */ |
| 435 | return pty_set_pktmode(tty, (int __user *)arg); |
Cyrill Gorcunov | 84fd7bd | 2012-10-24 23:43:22 +0400 | [diff] [blame] | 436 | case TIOCGPKT: /* Get PT packet mode */ |
| 437 | return pty_get_pktmode(tty, (int __user *)arg); |
hyc@symas.com | 26df6d1 | 2010-06-22 10:14:49 -0700 | [diff] [blame] | 438 | case TIOCSIG: /* Send signal to other side of pty */ |
| 439 | return pty_signal(tty, (int) arg); |
Jiri Slaby | ded2f29 | 2013-01-11 12:06:27 +0100 | [diff] [blame] | 440 | case TIOCGPTN: /* TTY returns ENOTTY, but glibc expects EINVAL here */ |
| 441 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 442 | } |
| 443 | return -ENOIOCTLCMD; |
| 444 | } |
| 445 | |
Kay Sievers | dc8c858 | 2007-08-15 12:25:38 +0200 | [diff] [blame] | 446 | static int legacy_count = CONFIG_LEGACY_PTY_COUNT; |
| 447 | module_param(legacy_count, int, 0); |
| 448 | |
Linus Torvalds | 342a597 | 2009-09-30 07:49:40 -0700 | [diff] [blame] | 449 | /* |
| 450 | * The master side of a pty can do TIOCSPTLCK and thus |
| 451 | * has pty_bsd_ioctl. |
| 452 | */ |
| 453 | static const struct tty_operations master_pty_ops_bsd = { |
| 454 | .install = pty_install, |
Alan Cox | 3e8e88c | 2008-04-30 00:54:10 -0700 | [diff] [blame] | 455 | .open = pty_open, |
| 456 | .close = pty_close, |
| 457 | .write = pty_write, |
| 458 | .write_room = pty_write_room, |
| 459 | .flush_buffer = pty_flush_buffer, |
| 460 | .chars_in_buffer = pty_chars_in_buffer, |
| 461 | .unthrottle = pty_unthrottle, |
| 462 | .set_termios = pty_set_termios, |
| 463 | .ioctl = pty_bsd_ioctl, |
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 |
Alan Cox | 3e8e88c | 2008-04-30 00:54:10 -0700 | [diff] [blame] | 467 | }; |
| 468 | |
Linus Torvalds | 342a597 | 2009-09-30 07:49:40 -0700 | [diff] [blame] | 469 | static const struct tty_operations slave_pty_ops_bsd = { |
| 470 | .install = pty_install, |
| 471 | .open = pty_open, |
| 472 | .close = pty_close, |
| 473 | .write = pty_write, |
| 474 | .write_room = pty_write_room, |
| 475 | .flush_buffer = pty_flush_buffer, |
| 476 | .chars_in_buffer = pty_chars_in_buffer, |
| 477 | .unthrottle = pty_unthrottle, |
| 478 | .set_termios = pty_set_termios, |
Jiri Slaby | d03702a | 2012-06-04 13:35:30 +0200 | [diff] [blame] | 479 | .cleanup = pty_cleanup, |
Alan Cox | d155255 | 2012-07-27 18:02:54 +0100 | [diff] [blame] | 480 | .resize = pty_resize, |
| 481 | .remove = pty_remove |
Linus Torvalds | 342a597 | 2009-09-30 07:49:40 -0700 | [diff] [blame] | 482 | }; |
| 483 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 484 | static void __init legacy_pty_init(void) |
| 485 | { |
Linus Torvalds | 342a597 | 2009-09-30 07:49:40 -0700 | [diff] [blame] | 486 | struct tty_driver *pty_driver, *pty_slave_driver; |
| 487 | |
Kay Sievers | dc8c858 | 2007-08-15 12:25:38 +0200 | [diff] [blame] | 488 | if (legacy_count <= 0) |
| 489 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 490 | |
Jiri Slaby | 21aca2f | 2012-08-08 22:26:41 +0200 | [diff] [blame] | 491 | pty_driver = tty_alloc_driver(legacy_count, |
| 492 | TTY_DRIVER_RESET_TERMIOS | |
| 493 | TTY_DRIVER_REAL_RAW | |
| 494 | TTY_DRIVER_DYNAMIC_ALLOC); |
Dan Carpenter | c3a6344 | 2012-08-16 16:16:56 +0300 | [diff] [blame] | 495 | if (IS_ERR(pty_driver)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 496 | panic("Couldn't allocate pty driver"); |
| 497 | |
Jiri Slaby | 21aca2f | 2012-08-08 22:26:41 +0200 | [diff] [blame] | 498 | pty_slave_driver = tty_alloc_driver(legacy_count, |
| 499 | TTY_DRIVER_RESET_TERMIOS | |
| 500 | TTY_DRIVER_REAL_RAW | |
| 501 | TTY_DRIVER_DYNAMIC_ALLOC); |
Dan Carpenter | c3a6344 | 2012-08-16 16:16:56 +0300 | [diff] [blame] | 502 | if (IS_ERR(pty_slave_driver)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 503 | panic("Couldn't allocate pty slave driver"); |
| 504 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 505 | pty_driver->driver_name = "pty_master"; |
| 506 | pty_driver->name = "pty"; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 507 | pty_driver->major = PTY_MASTER_MAJOR; |
| 508 | pty_driver->minor_start = 0; |
| 509 | pty_driver->type = TTY_DRIVER_TYPE_PTY; |
| 510 | pty_driver->subtype = PTY_TYPE_MASTER; |
| 511 | pty_driver->init_termios = tty_std_termios; |
| 512 | pty_driver->init_termios.c_iflag = 0; |
| 513 | pty_driver->init_termios.c_oflag = 0; |
| 514 | pty_driver->init_termios.c_cflag = B38400 | CS8 | CREAD; |
| 515 | pty_driver->init_termios.c_lflag = 0; |
Alan Cox | 606d099 | 2006-12-08 02:38:45 -0800 | [diff] [blame] | 516 | pty_driver->init_termios.c_ispeed = 38400; |
| 517 | pty_driver->init_termios.c_ospeed = 38400; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 518 | pty_driver->other = pty_slave_driver; |
Linus Torvalds | 342a597 | 2009-09-30 07:49:40 -0700 | [diff] [blame] | 519 | tty_set_operations(pty_driver, &master_pty_ops_bsd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 520 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 521 | pty_slave_driver->driver_name = "pty_slave"; |
| 522 | pty_slave_driver->name = "ttyp"; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 523 | pty_slave_driver->major = PTY_SLAVE_MAJOR; |
| 524 | pty_slave_driver->minor_start = 0; |
| 525 | pty_slave_driver->type = TTY_DRIVER_TYPE_PTY; |
| 526 | pty_slave_driver->subtype = PTY_TYPE_SLAVE; |
| 527 | pty_slave_driver->init_termios = tty_std_termios; |
| 528 | pty_slave_driver->init_termios.c_cflag = B38400 | CS8 | CREAD; |
Alan Cox | 606d099 | 2006-12-08 02:38:45 -0800 | [diff] [blame] | 529 | pty_slave_driver->init_termios.c_ispeed = 38400; |
| 530 | pty_slave_driver->init_termios.c_ospeed = 38400; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 531 | pty_slave_driver->other = pty_driver; |
Linus Torvalds | 342a597 | 2009-09-30 07:49:40 -0700 | [diff] [blame] | 532 | tty_set_operations(pty_slave_driver, &slave_pty_ops_bsd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 533 | |
| 534 | if (tty_register_driver(pty_driver)) |
| 535 | panic("Couldn't register pty driver"); |
| 536 | if (tty_register_driver(pty_slave_driver)) |
| 537 | panic("Couldn't register pty slave driver"); |
| 538 | } |
| 539 | #else |
| 540 | static inline void legacy_pty_init(void) { } |
| 541 | #endif |
| 542 | |
| 543 | /* Unix98 devices */ |
| 544 | #ifdef CONFIG_UNIX98_PTYS |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 545 | |
Alan Cox | d81ed10 | 2008-10-13 10:41:42 +0100 | [diff] [blame] | 546 | static struct cdev ptmx_cdev; |
| 547 | |
Alan Cox | 6caa76b | 2011-02-14 16:27:22 +0000 | [diff] [blame] | 548 | static int pty_unix98_ioctl(struct tty_struct *tty, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 549 | unsigned int cmd, unsigned long arg) |
| 550 | { |
| 551 | switch (cmd) { |
| 552 | case TIOCSPTLCK: /* Set PT Lock (disallow slave open) */ |
| 553 | return pty_set_lock(tty, (int __user *)arg); |
Cyrill Gorcunov | 84fd7bd | 2012-10-24 23:43:22 +0400 | [diff] [blame] | 554 | case TIOCGPTLCK: /* Get PT Lock status */ |
| 555 | return pty_get_lock(tty, (int __user *)arg); |
Cyrill Gorcunov | 06026d9 | 2012-10-24 23:43:20 +0400 | [diff] [blame] | 556 | case TIOCPKT: /* Set PT packet mode */ |
| 557 | return pty_set_pktmode(tty, (int __user *)arg); |
Cyrill Gorcunov | 84fd7bd | 2012-10-24 23:43:22 +0400 | [diff] [blame] | 558 | case TIOCGPKT: /* Get PT packet mode */ |
| 559 | return pty_get_pktmode(tty, (int __user *)arg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 560 | case TIOCGPTN: /* Get PT Number */ |
| 561 | return put_user(tty->index, (unsigned int __user *)arg); |
hyc@symas.com | 26df6d1 | 2010-06-22 10:14:49 -0700 | [diff] [blame] | 562 | case TIOCSIG: /* Send signal to other side of pty */ |
| 563 | return pty_signal(tty, (int) arg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 564 | } |
| 565 | |
| 566 | return -ENOIOCTLCMD; |
| 567 | } |
| 568 | |
Alan Cox | 99f1fe1 | 2008-10-13 10:42:00 +0100 | [diff] [blame] | 569 | /** |
| 570 | * ptm_unix98_lookup - find a pty master |
| 571 | * @driver: ptm driver |
| 572 | * @idx: tty index |
| 573 | * |
| 574 | * Look up a pty master device. Called under the tty_mutex for now. |
| 575 | * This provides our locking. |
| 576 | */ |
| 577 | |
Sukadev Bhattiprolu | 15f1a63 | 2008-10-13 10:42:59 +0100 | [diff] [blame] | 578 | static struct tty_struct *ptm_unix98_lookup(struct tty_driver *driver, |
| 579 | struct inode *ptm_inode, int idx) |
Alan Cox | 99f1fe1 | 2008-10-13 10:42:00 +0100 | [diff] [blame] | 580 | { |
Konstantin Khlebnikov | 593a27c | 2012-01-05 13:04:21 +0400 | [diff] [blame] | 581 | /* Master must be open via /dev/ptmx */ |
| 582 | return ERR_PTR(-EIO); |
Alan Cox | 99f1fe1 | 2008-10-13 10:42:00 +0100 | [diff] [blame] | 583 | } |
| 584 | |
| 585 | /** |
| 586 | * pts_unix98_lookup - find a pty slave |
| 587 | * @driver: pts driver |
| 588 | * @idx: tty index |
| 589 | * |
| 590 | * 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] | 591 | * This provides our locking for the tty pointer. |
Alan Cox | 99f1fe1 | 2008-10-13 10:42:00 +0100 | [diff] [blame] | 592 | */ |
| 593 | |
Sukadev Bhattiprolu | 15f1a63 | 2008-10-13 10:42:59 +0100 | [diff] [blame] | 594 | static struct tty_struct *pts_unix98_lookup(struct tty_driver *driver, |
| 595 | struct inode *pts_inode, int idx) |
Alan Cox | 99f1fe1 | 2008-10-13 10:42:00 +0100 | [diff] [blame] | 596 | { |
Alan Cox | d739e65 | 2012-05-03 22:22:09 +0100 | [diff] [blame] | 597 | struct tty_struct *tty; |
| 598 | |
| 599 | mutex_lock(&devpts_mutex); |
Jiri Slaby | 8fcbaa2 | 2012-10-18 22:26:27 +0200 | [diff] [blame] | 600 | tty = devpts_get_priv(pts_inode); |
Alan Cox | d739e65 | 2012-05-03 22:22:09 +0100 | [diff] [blame] | 601 | mutex_unlock(&devpts_mutex); |
Alan Cox | 99f1fe1 | 2008-10-13 10:42:00 +0100 | [diff] [blame] | 602 | /* Master must be open before slave */ |
| 603 | if (!tty) |
| 604 | return ERR_PTR(-EIO); |
| 605 | return tty; |
| 606 | } |
| 607 | |
Alan Cox | 8b0a88d | 2008-10-13 10:42:19 +0100 | [diff] [blame] | 608 | /* We have no need to install and remove our tty objects as devpts does all |
| 609 | the work for us */ |
| 610 | |
Alan Cox | bf970ee | 2008-10-13 10:42:39 +0100 | [diff] [blame] | 611 | 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] | 612 | { |
Jiri Slaby | 5d249bc | 2012-06-04 13:35:29 +0200 | [diff] [blame] | 613 | return pty_common_install(driver, tty, false); |
Alan Cox | 8b0a88d | 2008-10-13 10:42:19 +0100 | [diff] [blame] | 614 | } |
| 615 | |
Jiri Slaby | 7171604 | 2012-06-04 13:35:28 +0200 | [diff] [blame] | 616 | 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] | 617 | { |
Alan Cox | 8b0a88d | 2008-10-13 10:42:19 +0100 | [diff] [blame] | 618 | } |
| 619 | |
Jiri Slaby | f4b208e | 2013-04-15 07:52:05 +0200 | [diff] [blame] | 620 | /* this is called once with whichever end is closed last */ |
| 621 | static void pty_unix98_shutdown(struct tty_struct *tty) |
| 622 | { |
| 623 | devpts_kill_index(tty->driver_data, tty->index); |
| 624 | } |
| 625 | |
Alan Cox | feebed6 | 2008-10-13 10:41:30 +0100 | [diff] [blame] | 626 | static const struct tty_operations ptm_unix98_ops = { |
Alan Cox | 99f1fe1 | 2008-10-13 10:42:00 +0100 | [diff] [blame] | 627 | .lookup = ptm_unix98_lookup, |
Alan Cox | bf970ee | 2008-10-13 10:42:39 +0100 | [diff] [blame] | 628 | .install = pty_unix98_install, |
Jiri Slaby | 7171604 | 2012-06-04 13:35:28 +0200 | [diff] [blame] | 629 | .remove = pty_unix98_remove, |
Alan Cox | 3e8e88c | 2008-04-30 00:54:10 -0700 | [diff] [blame] | 630 | .open = pty_open, |
| 631 | .close = pty_close, |
| 632 | .write = pty_write, |
| 633 | .write_room = pty_write_room, |
| 634 | .flush_buffer = pty_flush_buffer, |
| 635 | .chars_in_buffer = pty_chars_in_buffer, |
| 636 | .unthrottle = pty_unthrottle, |
| 637 | .set_termios = pty_set_termios, |
Alan Cox | feebed6 | 2008-10-13 10:41:30 +0100 | [diff] [blame] | 638 | .ioctl = pty_unix98_ioctl, |
Alan Cox | 36b3c07 | 2012-07-17 17:06:57 +0100 | [diff] [blame] | 639 | .resize = pty_resize, |
Jiri Slaby | fa2ecfc5a | 2012-10-18 22:26:31 +0200 | [diff] [blame] | 640 | .shutdown = pty_unix98_shutdown, |
Alan Cox | 36b3c07 | 2012-07-17 17:06:57 +0100 | [diff] [blame] | 641 | .cleanup = pty_cleanup |
Alan Cox | 3e8e88c | 2008-04-30 00:54:10 -0700 | [diff] [blame] | 642 | }; |
| 643 | |
Alan Cox | 99f1fe1 | 2008-10-13 10:42:00 +0100 | [diff] [blame] | 644 | static const struct tty_operations pty_unix98_ops = { |
| 645 | .lookup = pts_unix98_lookup, |
Alan Cox | bf970ee | 2008-10-13 10:42:39 +0100 | [diff] [blame] | 646 | .install = pty_unix98_install, |
Jiri Slaby | 7171604 | 2012-06-04 13:35:28 +0200 | [diff] [blame] | 647 | .remove = pty_unix98_remove, |
Alan Cox | 99f1fe1 | 2008-10-13 10:42:00 +0100 | [diff] [blame] | 648 | .open = pty_open, |
| 649 | .close = pty_close, |
| 650 | .write = pty_write, |
| 651 | .write_room = pty_write_room, |
| 652 | .flush_buffer = pty_flush_buffer, |
| 653 | .chars_in_buffer = pty_chars_in_buffer, |
| 654 | .unthrottle = pty_unthrottle, |
| 655 | .set_termios = pty_set_termios, |
Jiri Slaby | fa2ecfc5a | 2012-10-18 22:26:31 +0200 | [diff] [blame] | 656 | .shutdown = pty_unix98_shutdown, |
Jiri Slaby | d03702a | 2012-06-04 13:35:30 +0200 | [diff] [blame] | 657 | .cleanup = pty_cleanup, |
Alan Cox | 99f1fe1 | 2008-10-13 10:42:00 +0100 | [diff] [blame] | 658 | }; |
Alan Cox | d81ed10 | 2008-10-13 10:41:42 +0100 | [diff] [blame] | 659 | |
| 660 | /** |
| 661 | * ptmx_open - open a unix 98 pty master |
| 662 | * @inode: inode of device file |
| 663 | * @filp: file pointer to tty |
| 664 | * |
| 665 | * Allocate a unix98 pty master device from the ptmx driver. |
| 666 | * |
| 667 | * Locking: tty_mutex protects the init_dev work. tty->count should |
Cong Ding | b9f8033 | 2013-01-12 05:01:22 +0100 | [diff] [blame] | 668 | * protect the rest. |
Alan Cox | d81ed10 | 2008-10-13 10:41:42 +0100 | [diff] [blame] | 669 | * allocated_ptys_lock handles the list of free pty numbers |
| 670 | */ |
| 671 | |
Arnd Bergmann | 64ba3dc | 2010-06-01 22:53:02 +0200 | [diff] [blame] | 672 | static int ptmx_open(struct inode *inode, struct file *filp) |
Alan Cox | d81ed10 | 2008-10-13 10:41:42 +0100 | [diff] [blame] | 673 | { |
| 674 | struct tty_struct *tty; |
Jiri Slaby | 162b97c | 2012-10-18 22:26:28 +0200 | [diff] [blame] | 675 | struct inode *slave_inode; |
Alan Cox | d81ed10 | 2008-10-13 10:41:42 +0100 | [diff] [blame] | 676 | int retval; |
| 677 | int index; |
| 678 | |
| 679 | nonseekable_open(inode, filp); |
| 680 | |
Linus Torvalds | b0b8856 | 2013-05-01 07:32:21 -0700 | [diff] [blame] | 681 | /* We refuse fsnotify events on ptmx, since it's a shared resource */ |
| 682 | filp->f_mode |= FMODE_NONOTIFY; |
| 683 | |
Jiri Slaby | fa90e1c | 2011-10-12 11:32:43 +0200 | [diff] [blame] | 684 | retval = tty_alloc_file(filp); |
| 685 | if (retval) |
| 686 | return retval; |
| 687 | |
Alan Cox | d81ed10 | 2008-10-13 10:41:42 +0100 | [diff] [blame] | 688 | /* find a device that is not in use. */ |
Alan Cox | 89c8d91 | 2012-08-08 16:30:13 +0100 | [diff] [blame] | 689 | mutex_lock(&devpts_mutex); |
Sukadev Bhattiprolu | 15f1a63 | 2008-10-13 10:42:59 +0100 | [diff] [blame] | 690 | index = devpts_new_index(inode); |
Jiri Slaby | fa90e1c | 2011-10-12 11:32:43 +0200 | [diff] [blame] | 691 | if (index < 0) { |
| 692 | retval = index; |
Alan Cox | 05fb79e | 2012-09-19 15:34:47 +0100 | [diff] [blame] | 693 | mutex_unlock(&devpts_mutex); |
Jiri Slaby | fa90e1c | 2011-10-12 11:32:43 +0200 | [diff] [blame] | 694 | goto err_file; |
| 695 | } |
Alan Cox | d81ed10 | 2008-10-13 10:41:42 +0100 | [diff] [blame] | 696 | |
Alan Cox | 6d31a88 | 2012-07-14 15:31:27 +0100 | [diff] [blame] | 697 | mutex_unlock(&devpts_mutex); |
Alan Cox | 89c8d91 | 2012-08-08 16:30:13 +0100 | [diff] [blame] | 698 | |
| 699 | mutex_lock(&tty_mutex); |
| 700 | tty = tty_init_dev(ptm_driver, index); |
Alan Cox | d81ed10 | 2008-10-13 10:41:42 +0100 | [diff] [blame] | 701 | |
Alan Cox | 73ec06f | 2008-10-13 10:42:29 +0100 | [diff] [blame] | 702 | if (IS_ERR(tty)) { |
| 703 | retval = PTR_ERR(tty); |
Alan Cox | d81ed10 | 2008-10-13 10:41:42 +0100 | [diff] [blame] | 704 | goto out; |
Alan Cox | 73ec06f | 2008-10-13 10:42:29 +0100 | [diff] [blame] | 705 | } |
Alan Cox | d81ed10 | 2008-10-13 10:41:42 +0100 | [diff] [blame] | 706 | |
Alan Cox | 89c8d91 | 2012-08-08 16:30:13 +0100 | [diff] [blame] | 707 | /* The tty returned here is locked so we can safely |
| 708 | drop the mutex */ |
| 709 | mutex_unlock(&tty_mutex); |
| 710 | |
Alan Cox | d81ed10 | 2008-10-13 10:41:42 +0100 | [diff] [blame] | 711 | set_bit(TTY_PTY_LOCK, &tty->flags); /* LOCK THE SLAVE */ |
Peter Hurley | 7acf6cd | 2013-01-30 12:43:49 -0500 | [diff] [blame] | 712 | tty->driver_data = inode; |
Nick Piggin | ee2ffa0 | 2010-08-18 04:37:35 +1000 | [diff] [blame] | 713 | |
Jiri Slaby | fa90e1c | 2011-10-12 11:32:43 +0200 | [diff] [blame] | 714 | tty_add_file(tty, filp); |
Alan Cox | d81ed10 | 2008-10-13 10:41:42 +0100 | [diff] [blame] | 715 | |
Jiri Slaby | f11afb6 | 2012-10-18 22:26:29 +0200 | [diff] [blame] | 716 | slave_inode = devpts_pty_new(inode, |
| 717 | MKDEV(UNIX98_PTY_SLAVE_MAJOR, index), index, |
| 718 | tty->link); |
Jiri Slaby | 162b97c | 2012-10-18 22:26:28 +0200 | [diff] [blame] | 719 | if (IS_ERR(slave_inode)) { |
| 720 | retval = PTR_ERR(slave_inode); |
Jiri Slaby | 1177c0e | 2011-10-12 11:32:44 +0200 | [diff] [blame] | 721 | goto err_release; |
Jiri Slaby | 162b97c | 2012-10-18 22:26:28 +0200 | [diff] [blame] | 722 | } |
Peter Hurley | 7acf6cd | 2013-01-30 12:43:49 -0500 | [diff] [blame] | 723 | tty->link->driver_data = slave_inode; |
Alan Cox | d81ed10 | 2008-10-13 10:41:42 +0100 | [diff] [blame] | 724 | |
| 725 | retval = ptm_driver->ops->open(tty, filp); |
Arnd Bergmann | 64ba3dc | 2010-06-01 22:53:02 +0200 | [diff] [blame] | 726 | if (retval) |
Jiri Slaby | 1177c0e | 2011-10-12 11:32:44 +0200 | [diff] [blame] | 727 | goto err_release; |
| 728 | |
Alan Cox | 89c8d91 | 2012-08-08 16:30:13 +0100 | [diff] [blame] | 729 | tty_unlock(tty); |
Jiri Slaby | 1177c0e | 2011-10-12 11:32:44 +0200 | [diff] [blame] | 730 | return 0; |
| 731 | err_release: |
Alan Cox | 89c8d91 | 2012-08-08 16:30:13 +0100 | [diff] [blame] | 732 | tty_unlock(tty); |
Alan Cox | eeb89d9 | 2009-11-30 13:18:29 +0000 | [diff] [blame] | 733 | tty_release(inode, filp); |
Alan Cox | d81ed10 | 2008-10-13 10:41:42 +0100 | [diff] [blame] | 734 | return retval; |
| 735 | out: |
Alan Cox | 89c8d91 | 2012-08-08 16:30:13 +0100 | [diff] [blame] | 736 | mutex_unlock(&tty_mutex); |
Jiri Slaby | d3bda52 | 2012-01-30 21:14:32 +0100 | [diff] [blame] | 737 | devpts_kill_index(inode, index); |
Jiri Slaby | fa90e1c | 2011-10-12 11:32:43 +0200 | [diff] [blame] | 738 | err_file: |
| 739 | tty_free_file(filp); |
Arnd Bergmann | 64ba3dc | 2010-06-01 22:53:02 +0200 | [diff] [blame] | 740 | return retval; |
Alan Cox | d81ed10 | 2008-10-13 10:41:42 +0100 | [diff] [blame] | 741 | } |
| 742 | |
| 743 | static struct file_operations ptmx_fops; |
| 744 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 745 | static void __init unix98_pty_init(void) |
| 746 | { |
Jiri Slaby | 21aca2f | 2012-08-08 22:26:41 +0200 | [diff] [blame] | 747 | ptm_driver = tty_alloc_driver(NR_UNIX98_PTY_MAX, |
| 748 | TTY_DRIVER_RESET_TERMIOS | |
| 749 | TTY_DRIVER_REAL_RAW | |
| 750 | TTY_DRIVER_DYNAMIC_DEV | |
| 751 | TTY_DRIVER_DEVPTS_MEM | |
| 752 | TTY_DRIVER_DYNAMIC_ALLOC); |
Dan Carpenter | c3a6344 | 2012-08-16 16:16:56 +0300 | [diff] [blame] | 753 | if (IS_ERR(ptm_driver)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 754 | panic("Couldn't allocate Unix98 ptm driver"); |
Jiri Slaby | 21aca2f | 2012-08-08 22:26:41 +0200 | [diff] [blame] | 755 | pts_driver = tty_alloc_driver(NR_UNIX98_PTY_MAX, |
| 756 | TTY_DRIVER_RESET_TERMIOS | |
| 757 | TTY_DRIVER_REAL_RAW | |
| 758 | TTY_DRIVER_DYNAMIC_DEV | |
| 759 | TTY_DRIVER_DEVPTS_MEM | |
| 760 | TTY_DRIVER_DYNAMIC_ALLOC); |
Dan Carpenter | c3a6344 | 2012-08-16 16:16:56 +0300 | [diff] [blame] | 761 | if (IS_ERR(pts_driver)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 762 | panic("Couldn't allocate Unix98 pts driver"); |
| 763 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 764 | ptm_driver->driver_name = "pty_master"; |
| 765 | ptm_driver->name = "ptm"; |
| 766 | ptm_driver->major = UNIX98_PTY_MASTER_MAJOR; |
| 767 | ptm_driver->minor_start = 0; |
| 768 | ptm_driver->type = TTY_DRIVER_TYPE_PTY; |
| 769 | ptm_driver->subtype = PTY_TYPE_MASTER; |
| 770 | ptm_driver->init_termios = tty_std_termios; |
| 771 | ptm_driver->init_termios.c_iflag = 0; |
| 772 | ptm_driver->init_termios.c_oflag = 0; |
| 773 | ptm_driver->init_termios.c_cflag = B38400 | CS8 | CREAD; |
| 774 | ptm_driver->init_termios.c_lflag = 0; |
Alan Cox | 606d099 | 2006-12-08 02:38:45 -0800 | [diff] [blame] | 775 | ptm_driver->init_termios.c_ispeed = 38400; |
| 776 | ptm_driver->init_termios.c_ospeed = 38400; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 777 | ptm_driver->other = pts_driver; |
Alan Cox | feebed6 | 2008-10-13 10:41:30 +0100 | [diff] [blame] | 778 | tty_set_operations(ptm_driver, &ptm_unix98_ops); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 779 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 780 | pts_driver->driver_name = "pty_slave"; |
| 781 | pts_driver->name = "pts"; |
| 782 | pts_driver->major = UNIX98_PTY_SLAVE_MAJOR; |
| 783 | pts_driver->minor_start = 0; |
| 784 | pts_driver->type = TTY_DRIVER_TYPE_PTY; |
| 785 | pts_driver->subtype = PTY_TYPE_SLAVE; |
| 786 | pts_driver->init_termios = tty_std_termios; |
| 787 | pts_driver->init_termios.c_cflag = B38400 | CS8 | CREAD; |
Alan Cox | 606d099 | 2006-12-08 02:38:45 -0800 | [diff] [blame] | 788 | pts_driver->init_termios.c_ispeed = 38400; |
| 789 | pts_driver->init_termios.c_ospeed = 38400; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 790 | pts_driver->other = ptm_driver; |
Alan Cox | 99f1fe1 | 2008-10-13 10:42:00 +0100 | [diff] [blame] | 791 | tty_set_operations(pts_driver, &pty_unix98_ops); |
Alan Cox | fe9cd96 | 2008-10-13 10:43:38 +0100 | [diff] [blame] | 792 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 793 | if (tty_register_driver(ptm_driver)) |
| 794 | panic("Couldn't register Unix98 ptm driver"); |
| 795 | if (tty_register_driver(pts_driver)) |
| 796 | panic("Couldn't register Unix98 pts driver"); |
| 797 | |
Alan Cox | d81ed10 | 2008-10-13 10:41:42 +0100 | [diff] [blame] | 798 | /* Now create the /dev/ptmx special device */ |
| 799 | tty_default_fops(&ptmx_fops); |
| 800 | ptmx_fops.open = ptmx_open; |
| 801 | |
| 802 | cdev_init(&ptmx_cdev, &ptmx_fops); |
| 803 | if (cdev_add(&ptmx_cdev, MKDEV(TTYAUX_MAJOR, 2), 1) || |
| 804 | register_chrdev_region(MKDEV(TTYAUX_MAJOR, 2), 1, "/dev/ptmx") < 0) |
Cong Ding | 82f8c35 | 2013-01-12 05:01:21 +0100 | [diff] [blame] | 805 | panic("Couldn't register /dev/ptmx driver"); |
Alan Cox | d81ed10 | 2008-10-13 10:41:42 +0100 | [diff] [blame] | 806 | device_create(tty_class, NULL, MKDEV(TTYAUX_MAJOR, 2), NULL, "ptmx"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 807 | } |
Alan Cox | d81ed10 | 2008-10-13 10:41:42 +0100 | [diff] [blame] | 808 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 809 | #else |
| 810 | static inline void unix98_pty_init(void) { } |
| 811 | #endif |
| 812 | |
| 813 | static int __init pty_init(void) |
| 814 | { |
| 815 | legacy_pty_init(); |
| 816 | unix98_pty_init(); |
| 817 | return 0; |
| 818 | } |
| 819 | module_init(pty_init); |