scoutos / prex-0.9.0 / usr / server / proc / proc_tty.c @ 03e9c04a
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1 | 03e9c04a | Brad Neuman | /*
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2 | * Copyright (c) 2007, Kohsuke Ohtani
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3 | * All rights reserved.
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4 | *
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5 | * Redistribution and use in source and binary forms, with or without
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6 | * modification, are permitted provided that the following conditions
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7 | * are met:
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8 | * 1. Redistributions of source code must retain the above copyright
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9 | * notice, this list of conditions and the following disclaimer.
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10 | * 2. Redistributions in binary form must reproduce the above copyright
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11 | * notice, this list of conditions and the following disclaimer in the
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12 | * documentation and/or other materials provided with the distribution.
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13 | * 3. Neither the name of the author nor the names of any co-contributors
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14 | * may be used to endorse or promote products derived from this software
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15 | * without specific prior written permission.
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16 | *
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17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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18 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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19 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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20 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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21 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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22 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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23 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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24 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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25 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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26 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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27 | * SUCH DAMAGE.
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28 | */
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29 | |||
30 | /*
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31 | * tty.c - TTY signal support
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32 | */
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33 | |||
34 | #include <sys/prex.h> |
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35 | #include <ipc/proc.h> |
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36 | #include <sys/list.h> |
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37 | |||
38 | #include <unistd.h> |
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39 | #include <errno.h> |
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40 | #include <stdlib.h> |
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41 | #include <signal.h> |
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42 | #include <termios.h> |
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43 | |||
44 | #include "proc.h" |
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45 | |||
46 | static device_t ttydev;
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47 | |||
48 | /*
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49 | * Send TTY signal.
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50 | */
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51 | static void |
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52 | tty_signal(int sig)
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53 | { |
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54 | pid_t pgid; |
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55 | |||
56 | /*
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57 | * Get the process group that was active when
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58 | * the TTY signal was invoked.
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59 | */
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60 | if (device_ioctl(ttydev, TIOCGPGRP, &pgid) != 0) |
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61 | return;
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62 | |||
63 | DPRINTF(("proc: tty_signal pgid=%d sig=%d\n", pgid, sig));
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64 | kill_pg(pgid, sig); |
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65 | } |
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66 | |||
67 | /*
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68 | * Catch TTY related signals and forward them
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69 | * to the appropriate processes.
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70 | */
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71 | static void |
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72 | exception_handler(int sig)
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73 | { |
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74 | |||
75 | /*
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76 | * Handle signals from tty input.
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77 | */
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78 | switch (sig) {
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79 | case SIGINT:
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80 | case SIGQUIT:
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81 | case SIGTSTP:
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82 | case SIGTTIN:
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83 | case SIGTTOU:
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84 | case SIGINFO:
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85 | case SIGWINCH:
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86 | case SIGIO:
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87 | if (ttydev != NODEV)
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88 | tty_signal(sig); |
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89 | break;
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90 | } |
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91 | exception_return(); |
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92 | } |
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93 | |||
94 | |||
95 | /*
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96 | * Initialize TTY.
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97 | *
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98 | * Since we manage the process group only in the process
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99 | * server, the TTY driver can not know anything about the
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100 | * process group. However, POSIX specification requires TTY
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101 | * driver to send a signal to the specific process group.
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102 | * So, we will catch all TTY related signals by this server
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103 | * and forward them to the actual process or process group.
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104 | */
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105 | void
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106 | tty_init(void)
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107 | { |
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108 | task_t self; |
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109 | |||
110 | /*
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111 | * Setup exception to receive signals from tty.
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112 | */
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113 | exception_setup(exception_handler); |
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114 | |||
115 | if (device_open("tty", 0, &ttydev) != 0) { |
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116 | DPRINTF(("proc: no tty found\n"));
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117 | ttydev = NODEV; |
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118 | } else {
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119 | /*
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120 | * Notify the TTY driver to send all tty related
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121 | * signals in system to this task.
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122 | */
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123 | self = task_self(); |
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124 | device_ioctl(ttydev, TIOCSETSIGT, &self); |
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125 | } |
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126 | } |