File: [local] / prex / usr / server / proc / tty.c (download)
Revision 1.1.1.1 (vendor branch), Tue Aug 19 12:47:01 2008 UTC (16 years ago) by nbrk
Branch: MAIN, KOHSUKE
CVS Tags: PREX_0_8_BASE, HEAD Changes since 1.1: +0 -0 lines
Initial import of Prex, Portable Real-time Embedded POSIX microkernel system.
I have totally new directions in my development (more focused on real hardware, not virtual one).
Old hacks are available in prex-old module. They will be carefully re-designed and merged soon.
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/*
* Copyright (c) 2007, Kohsuke Ohtani
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the author nor the names of any co-contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
/*
* tty.c - TTY signal support
*/
#include <prex/prex.h>
#include <server/proc.h>
#include <sys/list.h>
#include <unistd.h>
#include <errno.h>
#include <stdlib.h>
#include <signal.h>
#include <termios.h>
#include "proc.h"
static device_t ttydev;
/*
* Send TTY signal.
*/
static void
tty_signal(int sig)
{
pid_t pid;
/*
* Get the process group that was active when
* the TTY signal was invoked.
*/
if (device_ioctl(ttydev, TIOCGPGRP, &pid) != 0)
return;
DPRINTF(("proc: tty_signal sig=%d\n", sig));
kill_pg(pid, sig);
}
/*
* Catch TTY related signals and forward them
* to the appropriate processes.
*/
static void
exception_handler(int sig)
{
/*
* Handle signals from tty input.
*/
switch (sig) {
case SIGINT:
case SIGQUIT:
case SIGTSTP:
case SIGTTIN:
case SIGTTOU:
case SIGINFO:
case SIGWINCH:
case SIGIO:
if (ttydev != DEVICE_NULL)
tty_signal(sig);
break;
}
exception_return();
}
/*
* Initialize TTY.
*
* Since we manage the process group only in the process
* server, the TTY driver can not know anything about the
* process group. However, POSIX specification requires TTY
* driver to send a signal to the specific process group.
* So, we will catch all TTY related signals by this server
* and forward them to the actual process or process group.
*/
void
tty_init(void)
{
task_t self;
/*
* Setup exception to receive signals from tty.
*/
exception_setup(exception_handler);
if (device_open("tty", 0, &ttydev) != 0)
ttydev = DEVICE_NULL;
else {
/*
* Notify the TTY driver to send all tty related
* signals in system to this task.
*/
self = task_self();
device_ioctl(ttydev, TIOCSETSIGT, &self);
}
}