Annotation of prex/usr/server/proc/tty.c, Revision 1.1
1.1 ! nbrk 1: /*
! 2: * Copyright (c) 2007, Kohsuke Ohtani
! 3: * All rights reserved.
! 4: *
! 5: * Redistribution and use in source and binary forms, with or without
! 6: * modification, are permitted provided that the following conditions
! 7: * are met:
! 8: * 1. Redistributions of source code must retain the above copyright
! 9: * notice, this list of conditions and the following disclaimer.
! 10: * 2. Redistributions in binary form must reproduce the above copyright
! 11: * notice, this list of conditions and the following disclaimer in the
! 12: * documentation and/or other materials provided with the distribution.
! 13: * 3. Neither the name of the author nor the names of any co-contributors
! 14: * may be used to endorse or promote products derived from this software
! 15: * without specific prior written permission.
! 16: *
! 17: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
! 18: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
! 19: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
! 20: * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
! 21: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
! 22: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
! 23: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
! 24: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
! 25: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
! 26: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
! 27: * SUCH DAMAGE.
! 28: */
! 29:
! 30: /*
! 31: * tty.c - TTY signal support
! 32: */
! 33:
! 34: #include <prex/prex.h>
! 35: #include <server/proc.h>
! 36: #include <sys/list.h>
! 37:
! 38: #include <unistd.h>
! 39: #include <errno.h>
! 40: #include <stdlib.h>
! 41: #include <signal.h>
! 42: #include <termios.h>
! 43:
! 44: #include "proc.h"
! 45:
! 46: static device_t ttydev;
! 47:
! 48: /*
! 49: * Send TTY signal.
! 50: */
! 51: static void
! 52: tty_signal(int sig)
! 53: {
! 54: pid_t pid;
! 55:
! 56: /*
! 57: * Get the process group that was active when
! 58: * the TTY signal was invoked.
! 59: */
! 60: if (device_ioctl(ttydev, TIOCGPGRP, &pid) != 0)
! 61: return;
! 62:
! 63: DPRINTF(("proc: tty_signal sig=%d\n", sig));
! 64: kill_pg(pid, sig);
! 65: }
! 66:
! 67: /*
! 68: * Catch TTY related signals and forward them
! 69: * to the appropriate processes.
! 70: */
! 71: static void
! 72: exception_handler(int sig)
! 73: {
! 74:
! 75: /*
! 76: * Handle signals from tty input.
! 77: */
! 78: switch (sig) {
! 79: case SIGINT:
! 80: case SIGQUIT:
! 81: case SIGTSTP:
! 82: case SIGTTIN:
! 83: case SIGTTOU:
! 84: case SIGINFO:
! 85: case SIGWINCH:
! 86: case SIGIO:
! 87: if (ttydev != DEVICE_NULL)
! 88: tty_signal(sig);
! 89: break;
! 90: }
! 91: exception_return();
! 92: }
! 93:
! 94: /*
! 95: * Initialize TTY.
! 96: *
! 97: * Since we manage the process group only in the process
! 98: * server, the TTY driver can not know anything about the
! 99: * process group. However, POSIX specification requires TTY
! 100: * driver to send a signal to the specific process group.
! 101: * So, we will catch all TTY related signals by this server
! 102: * and forward them to the actual process or process group.
! 103: */
! 104: void
! 105: tty_init(void)
! 106: {
! 107: task_t self;
! 108:
! 109: /*
! 110: * Setup exception to receive signals from tty.
! 111: */
! 112: exception_setup(exception_handler);
! 113:
! 114: if (device_open("tty", 0, &ttydev) != 0)
! 115: ttydev = DEVICE_NULL;
! 116: else {
! 117: /*
! 118: * Notify the TTY driver to send all tty related
! 119: * signals in system to this task.
! 120: */
! 121: self = task_self();
! 122: device_ioctl(ttydev, TIOCSETSIGT, &self);
! 123: }
! 124: }
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