root / prex-0.9.0 / usr / server / proc / proc_tty.c @ 03e9c04a
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/*
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* Copyright (c) 2007, Kohsuke Ohtani
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the author nor the names of any co-contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*
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* tty.c - TTY signal support
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*/
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#include <sys/prex.h> |
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#include <ipc/proc.h> |
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#include <sys/list.h> |
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#include <unistd.h> |
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#include <errno.h> |
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#include <stdlib.h> |
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#include <signal.h> |
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#include <termios.h> |
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#include "proc.h" |
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static device_t ttydev;
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/*
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* Send TTY signal.
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*/
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static void |
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tty_signal(int sig)
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{ |
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pid_t pgid; |
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/*
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* Get the process group that was active when
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* the TTY signal was invoked.
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*/
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if (device_ioctl(ttydev, TIOCGPGRP, &pgid) != 0) |
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return;
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DPRINTF(("proc: tty_signal pgid=%d sig=%d\n", pgid, sig));
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kill_pg(pgid, sig); |
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} |
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/*
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* Catch TTY related signals and forward them
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* to the appropriate processes.
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*/
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static void |
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exception_handler(int sig)
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{ |
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/*
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* Handle signals from tty input.
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*/
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switch (sig) {
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case SIGINT:
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case SIGQUIT:
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case SIGTSTP:
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case SIGTTIN:
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case SIGTTOU:
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case SIGINFO:
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case SIGWINCH:
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case SIGIO:
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if (ttydev != NODEV)
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tty_signal(sig); |
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break;
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} |
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exception_return(); |
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} |
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/*
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* Initialize TTY.
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*
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* Since we manage the process group only in the process
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* server, the TTY driver can not know anything about the
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* process group. However, POSIX specification requires TTY
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* driver to send a signal to the specific process group.
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* So, we will catch all TTY related signals by this server
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* and forward them to the actual process or process group.
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*/
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void
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tty_init(void)
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{ |
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task_t self; |
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/*
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* Setup exception to receive signals from tty.
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*/
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exception_setup(exception_handler); |
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if (device_open("tty", 0, &ttydev) != 0) { |
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DPRINTF(("proc: no tty found\n"));
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ttydev = NODEV; |
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} else {
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/*
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* Notify the TTY driver to send all tty related
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* signals in system to this task.
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*/
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self = task_self(); |
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device_ioctl(ttydev, TIOCSETSIGT, &self); |
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} |
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} |