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Annotation of prex/usr/server/proc/tty.c, Revision 1.1.1.1

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: }