usr/server/proc/proc

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This source file includes following definitions.
tty_signal
exception_handler
tty_init
   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 <sys/prex.h>
  35 #include <ipc/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 pgid;
  55 
  56         /*
  57          * Get the process group that was active when
  58          * the TTY signal was invoked.
  59          */
  60         if (device_ioctl(ttydev, TIOCGPGRP, &pgid) != 0)
  61                 return;
  62 
  63         DPRINTF(("proc: tty_signal pgid=%d sig=%d\n", pgid, sig));
  64         kill_pg(pgid, 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 != NODEV)
  88                         tty_signal(sig);
  89                 break;
  90         }
  91         exception_return();
  92 }
  93 
  94 
  95 /*
  96  * Initialize TTY.
  97  *
  98  * Since we manage the process group only in the process
  99  * server, the TTY driver can not know anything about the
 100  * process group.  However, POSIX specification requires TTY
 101  * driver to send a signal to the specific process group.
 102  * So, we will catch all TTY related signals by this server
 103  * and forward them to the actual process or process group.
 104  */
 105 void
 106 tty_init(void)
 107 {
 108         task_t self;
 109 
 110         /*
 111          * Setup exception to receive signals from tty.
 112          */
 113         exception_setup(exception_handler);
 114 
 115         if (device_open("tty", 0, &ttydev) != 0) {
 116                 DPRINTF(("proc: no tty found\n"));
 117                 ttydev = NODEV;
 118         } else {
 119                 /*
 120                  * Notify the TTY driver to send all tty related
 121                  * signals in system to this task.
 122                  */
 123                 self = task_self();
 124                 device_ioctl(ttydev, TIOCSETSIGT, &self);
 125         }
 126 }
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root/usr/server/proc/proc_tty.c

DEFINITIONS
