root / 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 | } |