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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: }