1 |
62 |
marcus.erl |
/*
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2 |
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* linux/drivers/char/pty.c
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3 |
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*
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4 |
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* Copyright (C) 1991, 1992 Linus Torvalds
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5 |
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*
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6 |
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* Added support for a Unix98-style ptmx device.
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* -- C. Scott Ananian <cananian@alumni.princeton.edu>, 14-Jan-1998
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8 |
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* Added TTY_DO_WRITE_WAKEUP to enable n_tty to send POLL_OUT to
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9 |
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* waiting writers -- Sapan Bhatia <sapan@corewars.org>
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10 |
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*
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11 |
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*
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*/
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13 |
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14 |
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#include <linux/module.h> /* For EXPORT_SYMBOL */
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15 |
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16 |
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#include <linux/errno.h>
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17 |
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#include <linux/interrupt.h>
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18 |
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#include <linux/tty.h>
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19 |
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#include <linux/tty_flip.h>
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20 |
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#include <linux/fcntl.h>
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21 |
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#include <linux/string.h>
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22 |
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#include <linux/major.h>
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23 |
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#include <linux/mm.h>
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24 |
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#include <linux/init.h>
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25 |
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#include <linux/sysctl.h>
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26 |
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27 |
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#include <asm/uaccess.h>
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28 |
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#include <asm/system.h>
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29 |
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#include <linux/bitops.h>
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30 |
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#include <linux/devpts_fs.h>
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31 |
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32 |
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/* These are global because they are accessed in tty_io.c */
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33 |
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#ifdef CONFIG_UNIX98_PTYS
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34 |
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struct tty_driver *ptm_driver;
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35 |
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static struct tty_driver *pts_driver;
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36 |
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#endif
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37 |
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38 |
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static void pty_close(struct tty_struct * tty, struct file * filp)
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39 |
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{
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40 |
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if (!tty)
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41 |
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return;
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42 |
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if (tty->driver->subtype == PTY_TYPE_MASTER) {
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43 |
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if (tty->count > 1)
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44 |
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printk("master pty_close: count = %d!!\n", tty->count);
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45 |
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} else {
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46 |
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if (tty->count > 2)
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47 |
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return;
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48 |
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}
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49 |
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wake_up_interruptible(&tty->read_wait);
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50 |
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wake_up_interruptible(&tty->write_wait);
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51 |
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tty->packet = 0;
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52 |
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if (!tty->link)
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53 |
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return;
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54 |
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tty->link->packet = 0;
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55 |
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set_bit(TTY_OTHER_CLOSED, &tty->link->flags);
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56 |
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wake_up_interruptible(&tty->link->read_wait);
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57 |
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wake_up_interruptible(&tty->link->write_wait);
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58 |
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if (tty->driver->subtype == PTY_TYPE_MASTER) {
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59 |
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set_bit(TTY_OTHER_CLOSED, &tty->flags);
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60 |
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#ifdef CONFIG_UNIX98_PTYS
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61 |
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if (tty->driver == ptm_driver)
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62 |
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devpts_pty_kill(tty->index);
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63 |
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#endif
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64 |
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tty_vhangup(tty->link);
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65 |
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}
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66 |
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}
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67 |
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68 |
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/*
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69 |
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* The unthrottle routine is called by the line discipline to signal
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70 |
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* that it can receive more characters. For PTY's, the TTY_THROTTLED
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71 |
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* flag is always set, to force the line discipline to always call the
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72 |
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* unthrottle routine when there are fewer than TTY_THRESHOLD_UNTHROTTLE
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* characters in the queue. This is necessary since each time this
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74 |
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* happens, we need to wake up any sleeping processes that could be
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75 |
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* (1) trying to send data to the pty, or (2) waiting in wait_until_sent()
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76 |
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* for the pty buffer to be drained.
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77 |
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*/
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78 |
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static void pty_unthrottle(struct tty_struct * tty)
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79 |
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{
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80 |
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struct tty_struct *o_tty = tty->link;
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81 |
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82 |
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if (!o_tty)
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83 |
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return;
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84 |
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85 |
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tty_wakeup(o_tty);
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86 |
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set_bit(TTY_THROTTLED, &tty->flags);
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87 |
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}
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88 |
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89 |
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/*
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90 |
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* WSH 05/24/97: modified to
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91 |
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* (1) use space in tty->flip instead of a shared temp buffer
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92 |
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* The flip buffers aren't being used for a pty, so there's lots
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93 |
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* of space available. The buffer is protected by a per-pty
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94 |
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* semaphore that should almost never come under contention.
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95 |
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* (2) avoid redundant copying for cases where count >> receive_room
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96 |
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* N.B. Calls from user space may now return an error code instead of
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97 |
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* a count.
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98 |
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*
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99 |
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* FIXME: Our pty_write method is called with our ldisc lock held but
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100 |
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* not our partners. We can't just take the other one blindly without
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101 |
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* risking deadlocks.
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102 |
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*/
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103 |
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static int pty_write(struct tty_struct * tty, const unsigned char *buf, int count)
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104 |
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{
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105 |
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struct tty_struct *to = tty->link;
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106 |
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int c;
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107 |
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108 |
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if (!to || tty->stopped)
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109 |
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return 0;
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110 |
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111 |
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c = to->receive_room;
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112 |
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if (c > count)
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113 |
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c = count;
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114 |
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to->ldisc.receive_buf(to, buf, NULL, c);
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115 |
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116 |
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return c;
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117 |
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}
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118 |
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119 |
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static int pty_write_room(struct tty_struct *tty)
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120 |
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{
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121 |
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struct tty_struct *to = tty->link;
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122 |
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123 |
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if (!to || tty->stopped)
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124 |
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return 0;
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125 |
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126 |
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return to->receive_room;
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127 |
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}
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128 |
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|
129 |
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/*
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130 |
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* WSH 05/24/97: Modified for asymmetric MASTER/SLAVE behavior
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131 |
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* The chars_in_buffer() value is used by the ldisc select() function
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132 |
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* to hold off writing when chars_in_buffer > WAKEUP_CHARS (== 256).
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133 |
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* The pty driver chars_in_buffer() Master/Slave must behave differently:
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134 |
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*
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135 |
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* The Master side needs to allow typed-ahead commands to accumulate
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136 |
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* while being canonicalized, so we report "our buffer" as empty until
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137 |
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* some threshold is reached, and then report the count. (Any count >
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138 |
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* WAKEUP_CHARS is regarded by select() as "full".) To avoid deadlock
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139 |
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* the count returned must be 0 if no canonical data is available to be
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140 |
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* read. (The N_TTY ldisc.chars_in_buffer now knows this.)
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141 |
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*
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142 |
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* The Slave side passes all characters in raw mode to the Master side's
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143 |
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* buffer where they can be read immediately, so in this case we can
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144 |
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* return the true count in the buffer.
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145 |
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*/
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146 |
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static int pty_chars_in_buffer(struct tty_struct *tty)
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147 |
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{
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148 |
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struct tty_struct *to = tty->link;
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149 |
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int count;
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150 |
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151 |
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/* We should get the line discipline lock for "tty->link" */
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152 |
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if (!to || !to->ldisc.chars_in_buffer)
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153 |
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return 0;
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154 |
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155 |
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/* The ldisc must report 0 if no characters available to be read */
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156 |
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count = to->ldisc.chars_in_buffer(to);
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157 |
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158 |
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if (tty->driver->subtype == PTY_TYPE_SLAVE) return count;
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159 |
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160 |
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/* Master side driver ... if the other side's read buffer is less than
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161 |
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* half full, return 0 to allow writers to proceed; otherwise return
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162 |
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* the count. This leaves a comfortable margin to avoid overflow,
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163 |
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* and still allows half a buffer's worth of typed-ahead commands.
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164 |
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*/
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165 |
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return ((count < N_TTY_BUF_SIZE/2) ? 0 : count);
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166 |
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}
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167 |
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168 |
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/* Set the lock flag on a pty */
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169 |
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static int pty_set_lock(struct tty_struct *tty, int __user * arg)
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170 |
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{
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171 |
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int val;
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172 |
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if (get_user(val,arg))
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173 |
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return -EFAULT;
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174 |
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if (val)
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175 |
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set_bit(TTY_PTY_LOCK, &tty->flags);
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176 |
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else
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177 |
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clear_bit(TTY_PTY_LOCK, &tty->flags);
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178 |
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return 0;
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179 |
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}
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180 |
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181 |
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static void pty_flush_buffer(struct tty_struct *tty)
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182 |
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{
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183 |
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struct tty_struct *to = tty->link;
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184 |
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185 |
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if (!to)
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186 |
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return;
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187 |
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188 |
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if (to->ldisc.flush_buffer)
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189 |
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to->ldisc.flush_buffer(to);
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190 |
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191 |
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if (to->packet) {
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192 |
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tty->ctrl_status |= TIOCPKT_FLUSHWRITE;
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193 |
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wake_up_interruptible(&to->read_wait);
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194 |
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}
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195 |
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}
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196 |
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197 |
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static int pty_open(struct tty_struct *tty, struct file * filp)
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198 |
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{
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199 |
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int retval = -ENODEV;
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200 |
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|
201 |
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if (!tty || !tty->link)
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202 |
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goto out;
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203 |
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|
204 |
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retval = -EIO;
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205 |
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if (test_bit(TTY_OTHER_CLOSED, &tty->flags))
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206 |
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goto out;
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207 |
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if (test_bit(TTY_PTY_LOCK, &tty->link->flags))
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208 |
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goto out;
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209 |
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if (tty->link->count != 1)
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210 |
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goto out;
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211 |
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212 |
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clear_bit(TTY_OTHER_CLOSED, &tty->link->flags);
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213 |
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set_bit(TTY_THROTTLED, &tty->flags);
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214 |
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set_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
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215 |
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retval = 0;
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216 |
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out:
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217 |
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return retval;
|
218 |
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}
|
219 |
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|
220 |
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static void pty_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
|
221 |
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{
|
222 |
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tty->termios->c_cflag &= ~(CSIZE | PARENB);
|
223 |
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tty->termios->c_cflag |= (CS8 | CREAD);
|
224 |
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}
|
225 |
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|
226 |
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static const struct tty_operations pty_ops = {
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227 |
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.open = pty_open,
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228 |
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.close = pty_close,
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229 |
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.write = pty_write,
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230 |
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.write_room = pty_write_room,
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231 |
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.flush_buffer = pty_flush_buffer,
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232 |
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.chars_in_buffer = pty_chars_in_buffer,
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233 |
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.unthrottle = pty_unthrottle,
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234 |
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.set_termios = pty_set_termios,
|
235 |
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};
|
236 |
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|
237 |
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/* Traditional BSD devices */
|
238 |
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#ifdef CONFIG_LEGACY_PTYS
|
239 |
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static struct tty_driver *pty_driver, *pty_slave_driver;
|
240 |
|
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|
241 |
|
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static int pty_bsd_ioctl(struct tty_struct *tty, struct file *file,
|
242 |
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unsigned int cmd, unsigned long arg)
|
243 |
|
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{
|
244 |
|
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switch (cmd) {
|
245 |
|
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case TIOCSPTLCK: /* Set PT Lock (disallow slave open) */
|
246 |
|
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return pty_set_lock(tty, (int __user *) arg);
|
247 |
|
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}
|
248 |
|
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return -ENOIOCTLCMD;
|
249 |
|
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}
|
250 |
|
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|
251 |
|
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static int legacy_count = CONFIG_LEGACY_PTY_COUNT;
|
252 |
|
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module_param(legacy_count, int, 0);
|
253 |
|
|
|
254 |
|
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static void __init legacy_pty_init(void)
|
255 |
|
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{
|
256 |
|
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if (legacy_count <= 0)
|
257 |
|
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return;
|
258 |
|
|
|
259 |
|
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pty_driver = alloc_tty_driver(legacy_count);
|
260 |
|
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if (!pty_driver)
|
261 |
|
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panic("Couldn't allocate pty driver");
|
262 |
|
|
|
263 |
|
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pty_slave_driver = alloc_tty_driver(legacy_count);
|
264 |
|
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if (!pty_slave_driver)
|
265 |
|
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panic("Couldn't allocate pty slave driver");
|
266 |
|
|
|
267 |
|
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pty_driver->owner = THIS_MODULE;
|
268 |
|
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pty_driver->driver_name = "pty_master";
|
269 |
|
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pty_driver->name = "pty";
|
270 |
|
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pty_driver->major = PTY_MASTER_MAJOR;
|
271 |
|
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pty_driver->minor_start = 0;
|
272 |
|
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pty_driver->type = TTY_DRIVER_TYPE_PTY;
|
273 |
|
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pty_driver->subtype = PTY_TYPE_MASTER;
|
274 |
|
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pty_driver->init_termios = tty_std_termios;
|
275 |
|
|
pty_driver->init_termios.c_iflag = 0;
|
276 |
|
|
pty_driver->init_termios.c_oflag = 0;
|
277 |
|
|
pty_driver->init_termios.c_cflag = B38400 | CS8 | CREAD;
|
278 |
|
|
pty_driver->init_termios.c_lflag = 0;
|
279 |
|
|
pty_driver->init_termios.c_ispeed = 38400;
|
280 |
|
|
pty_driver->init_termios.c_ospeed = 38400;
|
281 |
|
|
pty_driver->flags = TTY_DRIVER_RESET_TERMIOS | TTY_DRIVER_REAL_RAW;
|
282 |
|
|
pty_driver->other = pty_slave_driver;
|
283 |
|
|
tty_set_operations(pty_driver, &pty_ops);
|
284 |
|
|
pty_driver->ioctl = pty_bsd_ioctl;
|
285 |
|
|
|
286 |
|
|
pty_slave_driver->owner = THIS_MODULE;
|
287 |
|
|
pty_slave_driver->driver_name = "pty_slave";
|
288 |
|
|
pty_slave_driver->name = "ttyp";
|
289 |
|
|
pty_slave_driver->major = PTY_SLAVE_MAJOR;
|
290 |
|
|
pty_slave_driver->minor_start = 0;
|
291 |
|
|
pty_slave_driver->type = TTY_DRIVER_TYPE_PTY;
|
292 |
|
|
pty_slave_driver->subtype = PTY_TYPE_SLAVE;
|
293 |
|
|
pty_slave_driver->init_termios = tty_std_termios;
|
294 |
|
|
pty_slave_driver->init_termios.c_cflag = B38400 | CS8 | CREAD;
|
295 |
|
|
pty_slave_driver->init_termios.c_ispeed = 38400;
|
296 |
|
|
pty_slave_driver->init_termios.c_ospeed = 38400;
|
297 |
|
|
pty_slave_driver->flags = TTY_DRIVER_RESET_TERMIOS |
|
298 |
|
|
TTY_DRIVER_REAL_RAW;
|
299 |
|
|
pty_slave_driver->other = pty_driver;
|
300 |
|
|
tty_set_operations(pty_slave_driver, &pty_ops);
|
301 |
|
|
|
302 |
|
|
if (tty_register_driver(pty_driver))
|
303 |
|
|
panic("Couldn't register pty driver");
|
304 |
|
|
if (tty_register_driver(pty_slave_driver))
|
305 |
|
|
panic("Couldn't register pty slave driver");
|
306 |
|
|
}
|
307 |
|
|
#else
|
308 |
|
|
static inline void legacy_pty_init(void) { }
|
309 |
|
|
#endif
|
310 |
|
|
|
311 |
|
|
/* Unix98 devices */
|
312 |
|
|
#ifdef CONFIG_UNIX98_PTYS
|
313 |
|
|
/*
|
314 |
|
|
* sysctl support for setting limits on the number of Unix98 ptys allocated.
|
315 |
|
|
* Otherwise one can eat up all kernel memory by opening /dev/ptmx repeatedly.
|
316 |
|
|
*/
|
317 |
|
|
int pty_limit = NR_UNIX98_PTY_DEFAULT;
|
318 |
|
|
static int pty_limit_min = 0;
|
319 |
|
|
static int pty_limit_max = NR_UNIX98_PTY_MAX;
|
320 |
|
|
|
321 |
|
|
static struct ctl_table pty_table[] = {
|
322 |
|
|
{
|
323 |
|
|
.ctl_name = PTY_MAX,
|
324 |
|
|
.procname = "max",
|
325 |
|
|
.maxlen = sizeof(int),
|
326 |
|
|
.mode = 0644,
|
327 |
|
|
.data = &pty_limit,
|
328 |
|
|
.proc_handler = &proc_dointvec_minmax,
|
329 |
|
|
.strategy = &sysctl_intvec,
|
330 |
|
|
.extra1 = &pty_limit_min,
|
331 |
|
|
.extra2 = &pty_limit_max,
|
332 |
|
|
}, {
|
333 |
|
|
.ctl_name = PTY_NR,
|
334 |
|
|
.procname = "nr",
|
335 |
|
|
.maxlen = sizeof(int),
|
336 |
|
|
.mode = 0444,
|
337 |
|
|
.proc_handler = &proc_dointvec,
|
338 |
|
|
}, {
|
339 |
|
|
.ctl_name = 0
|
340 |
|
|
}
|
341 |
|
|
};
|
342 |
|
|
|
343 |
|
|
static struct ctl_table pty_kern_table[] = {
|
344 |
|
|
{
|
345 |
|
|
.ctl_name = KERN_PTY,
|
346 |
|
|
.procname = "pty",
|
347 |
|
|
.mode = 0555,
|
348 |
|
|
.child = pty_table,
|
349 |
|
|
},
|
350 |
|
|
{}
|
351 |
|
|
};
|
352 |
|
|
|
353 |
|
|
static struct ctl_table pty_root_table[] = {
|
354 |
|
|
{
|
355 |
|
|
.ctl_name = CTL_KERN,
|
356 |
|
|
.procname = "kernel",
|
357 |
|
|
.mode = 0555,
|
358 |
|
|
.child = pty_kern_table,
|
359 |
|
|
},
|
360 |
|
|
{}
|
361 |
|
|
};
|
362 |
|
|
|
363 |
|
|
|
364 |
|
|
static int pty_unix98_ioctl(struct tty_struct *tty, struct file *file,
|
365 |
|
|
unsigned int cmd, unsigned long arg)
|
366 |
|
|
{
|
367 |
|
|
switch (cmd) {
|
368 |
|
|
case TIOCSPTLCK: /* Set PT Lock (disallow slave open) */
|
369 |
|
|
return pty_set_lock(tty, (int __user *)arg);
|
370 |
|
|
case TIOCGPTN: /* Get PT Number */
|
371 |
|
|
return put_user(tty->index, (unsigned int __user *)arg);
|
372 |
|
|
}
|
373 |
|
|
|
374 |
|
|
return -ENOIOCTLCMD;
|
375 |
|
|
}
|
376 |
|
|
|
377 |
|
|
static void __init unix98_pty_init(void)
|
378 |
|
|
{
|
379 |
|
|
ptm_driver = alloc_tty_driver(NR_UNIX98_PTY_MAX);
|
380 |
|
|
if (!ptm_driver)
|
381 |
|
|
panic("Couldn't allocate Unix98 ptm driver");
|
382 |
|
|
pts_driver = alloc_tty_driver(NR_UNIX98_PTY_MAX);
|
383 |
|
|
if (!pts_driver)
|
384 |
|
|
panic("Couldn't allocate Unix98 pts driver");
|
385 |
|
|
|
386 |
|
|
ptm_driver->owner = THIS_MODULE;
|
387 |
|
|
ptm_driver->driver_name = "pty_master";
|
388 |
|
|
ptm_driver->name = "ptm";
|
389 |
|
|
ptm_driver->major = UNIX98_PTY_MASTER_MAJOR;
|
390 |
|
|
ptm_driver->minor_start = 0;
|
391 |
|
|
ptm_driver->type = TTY_DRIVER_TYPE_PTY;
|
392 |
|
|
ptm_driver->subtype = PTY_TYPE_MASTER;
|
393 |
|
|
ptm_driver->init_termios = tty_std_termios;
|
394 |
|
|
ptm_driver->init_termios.c_iflag = 0;
|
395 |
|
|
ptm_driver->init_termios.c_oflag = 0;
|
396 |
|
|
ptm_driver->init_termios.c_cflag = B38400 | CS8 | CREAD;
|
397 |
|
|
ptm_driver->init_termios.c_lflag = 0;
|
398 |
|
|
ptm_driver->init_termios.c_ispeed = 38400;
|
399 |
|
|
ptm_driver->init_termios.c_ospeed = 38400;
|
400 |
|
|
ptm_driver->flags = TTY_DRIVER_RESET_TERMIOS | TTY_DRIVER_REAL_RAW |
|
401 |
|
|
TTY_DRIVER_DYNAMIC_DEV | TTY_DRIVER_DEVPTS_MEM;
|
402 |
|
|
ptm_driver->other = pts_driver;
|
403 |
|
|
tty_set_operations(ptm_driver, &pty_ops);
|
404 |
|
|
ptm_driver->ioctl = pty_unix98_ioctl;
|
405 |
|
|
|
406 |
|
|
pts_driver->owner = THIS_MODULE;
|
407 |
|
|
pts_driver->driver_name = "pty_slave";
|
408 |
|
|
pts_driver->name = "pts";
|
409 |
|
|
pts_driver->major = UNIX98_PTY_SLAVE_MAJOR;
|
410 |
|
|
pts_driver->minor_start = 0;
|
411 |
|
|
pts_driver->type = TTY_DRIVER_TYPE_PTY;
|
412 |
|
|
pts_driver->subtype = PTY_TYPE_SLAVE;
|
413 |
|
|
pts_driver->init_termios = tty_std_termios;
|
414 |
|
|
pts_driver->init_termios.c_cflag = B38400 | CS8 | CREAD;
|
415 |
|
|
pts_driver->init_termios.c_ispeed = 38400;
|
416 |
|
|
pts_driver->init_termios.c_ospeed = 38400;
|
417 |
|
|
pts_driver->flags = TTY_DRIVER_RESET_TERMIOS | TTY_DRIVER_REAL_RAW |
|
418 |
|
|
TTY_DRIVER_DYNAMIC_DEV | TTY_DRIVER_DEVPTS_MEM;
|
419 |
|
|
pts_driver->other = ptm_driver;
|
420 |
|
|
tty_set_operations(pts_driver, &pty_ops);
|
421 |
|
|
|
422 |
|
|
if (tty_register_driver(ptm_driver))
|
423 |
|
|
panic("Couldn't register Unix98 ptm driver");
|
424 |
|
|
if (tty_register_driver(pts_driver))
|
425 |
|
|
panic("Couldn't register Unix98 pts driver");
|
426 |
|
|
|
427 |
|
|
pty_table[1].data = &ptm_driver->refcount;
|
428 |
|
|
register_sysctl_table(pty_root_table);
|
429 |
|
|
}
|
430 |
|
|
#else
|
431 |
|
|
static inline void unix98_pty_init(void) { }
|
432 |
|
|
#endif
|
433 |
|
|
|
434 |
|
|
static int __init pty_init(void)
|
435 |
|
|
{
|
436 |
|
|
legacy_pty_init();
|
437 |
|
|
unix98_pty_init();
|
438 |
|
|
return 0;
|
439 |
|
|
}
|
440 |
|
|
module_init(pty_init);
|