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/****************************************************************************
**
** Copyright (C) 2015 The Qt Company Ltd.
** Contact: http://www.qt.io/licensing/
**
** This file is part of the plugins of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL21$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see http://www.qt.io/terms-conditions. For further
** information use the contact form at http://www.qt.io/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 or version 3 as published by the Free
** Software Foundation and appearing in the file LICENSE.LGPLv21 and
** LICENSE.LGPLv3 included in the packaging of this file. Please review the
** following information to ensure the GNU Lesser General Public License
** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** As a special exception, The Qt Company gives you certain additional
** rights. These rights are described in The Qt Company LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qfbvthandler_p.h"
#include <QtCore/QSocketNotifier>
#if defined(Q_OS_LINUX) && !defined(Q_OS_ANDROID) && (!defined(QT_NO_EVDEV) || !defined(QT_NO_LIBINPUT))
#define VTH_ENABLED
#include <private/qcore_unix_p.h>
#include <unistd.h>
#include <signal.h>
#include <errno.h>
#include <fcntl.h>
#include <sys/signalfd.h>
#include <sys/ioctl.h>
#include <linux/kd.h>
#ifndef KDSKBMUTE
#define KDSKBMUTE 0x4B51
#endif
#ifdef K_OFF
#define KBD_OFF_MODE K_OFF
#else
#define KBD_OFF_MODE K_RAW
#endif
#endif
QT_BEGIN_NAMESPACE
#ifdef VTH_ENABLED
static void setTTYCursor(bool enable)
{
const char * const devs[] = { "/dev/tty0", "/dev/tty", "/dev/console", 0 };
int fd = -1;
for (const char * const *dev = devs; *dev; ++dev) {
fd = QT_OPEN(*dev, O_RDWR);
if (fd != -1) {
// Enable/disable screen blanking and the blinking cursor.
const char *termctl = enable ? "\033[9;15]\033[?33h\033[?25h\033[?0c" : "\033[9;0]\033[?33l\033[?25l\033[?1c";
QT_WRITE(fd, termctl, strlen(termctl) + 1);
QT_CLOSE(fd);
return;
}
}
}
#endif
QFbVtHandler::QFbVtHandler(QObject *parent)
: QObject(parent),
m_tty(-1),
m_signalFd(-1),
m_signalNotifier(0)
{
#ifdef VTH_ENABLED
setTTYCursor(false);
if (isatty(0)) {
m_tty = 0;
ioctl(m_tty, KDGKBMODE, &m_oldKbdMode);
if (!qEnvironmentVariableIntValue("QT_QPA_ENABLE_TERMINAL_KEYBOARD")) {
// Disable the tty keyboard.
ioctl(m_tty, KDSKBMUTE, 1);
ioctl(m_tty, KDSKBMODE, KBD_OFF_MODE);
}
}
// SIGSEGV and such cannot safely be blocked. We cannot handle them in an
// async-safe manner either. Restoring the keyboard, video mode, etc. may
// all contain calls that cannot safely be made from a signal handler.
// Other signals: block them and use signalfd.
sigset_t mask;
sigemptyset(&mask);
// Catch Ctrl+C.
sigaddset(&mask, SIGINT);
// Ctrl+Z. Up to the platform plugins to handle it in a meaningful way.
sigaddset(&mask, SIGTSTP);
sigaddset(&mask, SIGCONT);
// Default signal used by kill. To overcome the common issue of no cleaning
// up when killing a locally started app via a remote session.
sigaddset(&mask, SIGTERM);
m_signalFd = signalfd(-1, &mask, SFD_CLOEXEC);
if (m_signalFd < 0) {
qErrnoWarning(errno, "signalfd() failed");
} else {
m_signalNotifier = new QSocketNotifier(m_signalFd, QSocketNotifier::Read, this);
connect(m_signalNotifier, &QSocketNotifier::activated, this, &QFbVtHandler::handleSignal);
// Block the signals that are handled via signalfd. Applies only to the current
// thread, but new threads will inherit the creator's signal mask.
pthread_sigmask(SIG_BLOCK, &mask, 0);
}
#endif
}
QFbVtHandler::~QFbVtHandler()
{
#ifdef VTH_ENABLED
restoreKeyboard();
setTTYCursor(true);
if (m_signalFd != -1)
close(m_signalFd);
#endif
}
void QFbVtHandler::restoreKeyboard()
{
#ifdef VTH_ENABLED
if (m_tty == -1)
return;
ioctl(m_tty, KDSKBMUTE, 0);
ioctl(m_tty, KDSKBMODE, m_oldKbdMode);
#endif
}
// To be called from the slot connected to suspendRequested() in case the
// platform plugin does in fact allow suspending on Ctrl+Z.
void QFbVtHandler::suspend()
{
#ifdef VTH_ENABLED
kill(getpid(), SIGSTOP);
#endif
}
void QFbVtHandler::handleSignal()
{
#ifdef VTH_ENABLED
m_signalNotifier->setEnabled(false);
signalfd_siginfo sig;
if (read(m_signalFd, &sig, sizeof(sig)) == sizeof(sig)) {
switch (sig.ssi_signo) {
case SIGINT: // fallthrough
case SIGTERM:
handleInt();
break;
case SIGTSTP:
emit suspendRequested();
break;
case SIGCONT:
emit resumed();
break;
default:
break;
}
}
m_signalNotifier->setEnabled(true);
#endif
}
void QFbVtHandler::handleInt()
{
#ifdef VTH_ENABLED
emit interrupted();
restoreKeyboard();
setTTYCursor(true);
_exit(1);
#endif
}
QT_END_NAMESPACE
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