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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#include "qfbvthandler_p.h"
#include <QtCore/QSocketNotifier>
#include <QtCore/private/qglobal_p.h>
#if defined(Q_OS_LINUX) && !defined(Q_OS_ANDROID) && (QT_CONFIG(evdev) || QT_CONFIG(libinput))
#define VTH_ENABLED
#include <private/qcore_unix_p.h>
#include <unistd.h>
#include <signal.h>
#include <errno.h>
#include <fcntl.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)
{
static bool ignore = qEnvironmentVariableIntValue("QT_QPA_PRESERVE_CONSOLE_STATE");
if (ignore)
return;
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
#ifdef VTH_ENABLED
static QFbVtHandler *vth;
void QFbVtHandler::signalHandler(int sigNo)
{
char a = sigNo;
QT_WRITE(vth->m_sigFd[0], &a, sizeof(a));
}
#endif
QFbVtHandler::QFbVtHandler(QObject *parent)
: QObject(parent),
m_tty(-1),
m_signalNotifier(0)
{
#ifdef VTH_ENABLED
if (isatty(0))
m_tty = 0;
if (::socketpair(AF_UNIX, SOCK_STREAM, 0, m_sigFd)) {
qErrnoWarning(errno, "QFbVtHandler: socketpair() failed");
return;
}
vth = this;
setTTYCursor(false);
setKeyboardEnabled(false);
m_signalNotifier = new QSocketNotifier(m_sigFd[1], QSocketNotifier::Read, this);
connect(m_signalNotifier, &QSocketNotifier::activated, this, &QFbVtHandler::handleSignal);
if (!qEnvironmentVariableIntValue("QT_QPA_NO_SIGNAL_HANDLER")) {
struct sigaction sa;
sa.sa_flags = 0;
sa.sa_handler = signalHandler;
sigemptyset(&sa.sa_mask);
sigaction(SIGINT, &sa, 0); // Ctrl+C
sigaction(SIGTSTP, &sa, 0); // Ctrl+Z
sigaction(SIGCONT, &sa, 0);
sigaction(SIGTERM, &sa, 0); // default signal used by kill
}
#endif
}
QFbVtHandler::~QFbVtHandler()
{
#ifdef VTH_ENABLED
setKeyboardEnabled(true);
setTTYCursor(true);
if (m_signalNotifier) {
close(m_sigFd[0]);
close(m_sigFd[1]);
}
#endif
}
void QFbVtHandler::setKeyboardEnabled(bool enable)
{
#ifdef VTH_ENABLED
if (m_tty == -1)
return;
if (enable) {
::ioctl(m_tty, KDSKBMUTE, 0);
::ioctl(m_tty, KDSKBMODE, m_oldKbdMode);
} else {
::ioctl(m_tty, KDGKBMODE, &m_oldKbdMode);
if (!qEnvironmentVariableIntValue("QT_QPA_ENABLE_TERMINAL_KEYBOARD")) {
::ioctl(m_tty, KDSKBMUTE, 1);
::ioctl(m_tty, KDSKBMODE, KBD_OFF_MODE);
}
}
#else
Q_UNUSED(enable);
#endif
}
void QFbVtHandler::handleSignal()
{
#ifdef VTH_ENABLED
m_signalNotifier->setEnabled(false);
char sigNo;
if (QT_READ(m_sigFd[1], &sigNo, sizeof(sigNo)) == sizeof(sigNo)) {
switch (sigNo) {
case SIGINT:
case SIGTERM:
handleInt();
break;
case SIGTSTP:
emit aboutToSuspend();
setKeyboardEnabled(true);
setTTYCursor(true);
::kill(getpid(), SIGSTOP);
break;
case SIGCONT:
setTTYCursor(false);
setKeyboardEnabled(false);
emit resumed();
break;
default:
break;
}
}
m_signalNotifier->setEnabled(true);
#endif
}
void QFbVtHandler::handleInt()
{
#ifdef VTH_ENABLED
emit interrupted();
setKeyboardEnabled(true);
setTTYCursor(true);
_exit(1);
#endif
}
QT_END_NAMESPACE
#include "moc_qfbvthandler_p.cpp"
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