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Annotation of prex-old/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: #include <prex/prex.h>
                     31: #include <server/proc.h>
                     32: #include <sys/list.h>
                     33: #include <sys/ioctl.h>
                     34:
                     35: #include <unistd.h>
                     36: #include <errno.h>
                     37: #include <stdlib.h>
                     38: #include <signal.h>
                     39:
                     40: #include "proc.h"
                     41:
                     42: static device_t ttydev;
                     43:
                     44: static void
                     45: tty_signal(int code)
                     46: {
                     47:        pid_t pid;
                     48:
                     49:        if (device_ioctl(ttydev, TIOCGPGRP, (u_long)&pid) != 0)
                     50:                return;
                     51:        kill_pg(pid, code);
                     52: }
                     53:
                     54: static void
                     55: exception_handler(int code, void *regs)
                     56: {
                     57:        /*
                     58:         * Handle signals from tty input.
                     59:         */
                     60:        switch (code) {
                     61:        case SIGINT:
                     62:        case SIGQUIT:
                     63:        case SIGTSTP:
                     64:        case SIGTTIN:
                     65:        case SIGTTOU:
                     66:        case SIGINFO:
                     67:        case SIGWINCH:
                     68:        case SIGIO:
                     69:                if (ttydev != DEVICE_NULL)
                     70:                        tty_signal(code);
                     71:                break;
                     72:        }
                     73:        exception_return(regs);
                     74: }
                     75:
                     76: void
                     77: tty_init(void)
                     78: {
                     79:        task_t self;
                     80:
                     81:        /*
                     82:         * Setup exception to recieve signals from tty.
                     83:         */
                     84:        exception_setup(exception_handler);
                     85:
                     86:        if (device_open("tty", 0, &ttydev) != 0)
                     87:                ttydev = DEVICE_NULL;
                     88:        else {
                     89:                self = task_self();
                     90:                device_ioctl(ttydev, TIOCSETSIGT, (u_long)&self);
                     91:        }
                     92: }