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kwin/main_x11.cpp

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/*
KWin - the KDE window manager
This file is part of the KDE project.
SPDX-FileCopyrightText: 1999, 2000 Matthias Ettrich <ettrich@kde.org>
SPDX-FileCopyrightText: 2003 Lubos Lunak <l.lunak@kde.org>
SPDX-FileCopyrightText: 2014 Martin Gräßlin <mgraesslin@kde.org>
SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "main_x11.h"
#include <config-kwin.h>
#include "platform.h"
#include "sm.h"
#include "workspace.h"
#include "xcbutils.h"
#include <KConfigGroup>
#include <KCrash>
#include <KLocalizedString>
#include <KPluginLoader>
#include <KPluginMetaData>
#include <KSelectionOwner>
#include <KQuickAddons/QtQuickSettings>
#include <qplatformdefs.h>
#include <QComboBox>
#include <QCommandLineParser>
#include <QDialog>
#include <QDialogButtonBox>
#include <QFile>
#include <QLabel>
#include <QPushButton>
#include <QSurfaceFormat>
#include <QVBoxLayout>
#include <QX11Info>
#include <QtDBus>
// system
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif // HAVE_UNISTD_H
#include <iostream>
Q_LOGGING_CATEGORY(KWIN_CORE, "kwin_core", QtCriticalMsg)
namespace KWin
{
static void sighandler(int)
{
QApplication::exit();
}
class AlternativeWMDialog : public QDialog
{
public:
AlternativeWMDialog()
: QDialog() {
QWidget* mainWidget = new QWidget(this);
QVBoxLayout* layout = new QVBoxLayout(mainWidget);
QString text = i18n(
"KWin is unstable.\n"
"It seems to have crashed several times in a row.\n"
"You can select another window manager to run:");
QLabel* textLabel = new QLabel(text, mainWidget);
layout->addWidget(textLabel);
wmList = new QComboBox(mainWidget);
wmList->setEditable(true);
layout->addWidget(wmList);
addWM(QStringLiteral("metacity"));
addWM(QStringLiteral("openbox"));
addWM(QStringLiteral("fvwm2"));
addWM(QStringLiteral(KWIN_INTERNAL_NAME_X11));
QVBoxLayout *mainLayout = new QVBoxLayout(this);
mainLayout->addWidget(mainWidget);
QDialogButtonBox *buttons = new QDialogButtonBox(QDialogButtonBox::Ok | QDialogButtonBox::Cancel, this);
buttons->button(QDialogButtonBox::Ok)->setDefault(true);
connect(buttons, &QDialogButtonBox::accepted, this, &QDialog::accept);
connect(buttons, &QDialogButtonBox::rejected, this, &QDialog::reject);
mainLayout->addWidget(buttons);
raise();
}
void addWM(const QString& wm) {
// TODO: Check if WM is installed
if (!QStandardPaths::findExecutable(wm).isEmpty())
wmList->addItem(wm);
}
QString selectedWM() const {
return wmList->currentText();
}
private:
QComboBox* wmList;
};
class KWinSelectionOwner : public KSelectionOwner
{
Q_OBJECT
public:
explicit KWinSelectionOwner(int screen)
: KSelectionOwner(make_selection_atom(screen), screen)
{
}
private:
bool genericReply(xcb_atom_t target_P, xcb_atom_t property_P, xcb_window_t requestor_P) override {
if (target_P == xa_version) {
int32_t version[] = { 2, 0 };
xcb_change_property(connection(), XCB_PROP_MODE_REPLACE, requestor_P,
property_P, XCB_ATOM_INTEGER, 32, 2, version);
} else
return KSelectionOwner::genericReply(target_P, property_P, requestor_P);
return true;
}
void replyTargets(xcb_atom_t property_P, xcb_window_t requestor_P) override {
KSelectionOwner::replyTargets(property_P, requestor_P);
xcb_atom_t atoms[ 1 ] = { xa_version };
// PropModeAppend !
xcb_change_property(connection(), XCB_PROP_MODE_APPEND, requestor_P,
property_P, XCB_ATOM_ATOM, 32, 1, atoms);
}
void getAtoms() override {
KSelectionOwner::getAtoms();
if (xa_version == XCB_ATOM_NONE) {
const QByteArray name(QByteArrayLiteral("VERSION"));
ScopedCPointer<xcb_intern_atom_reply_t> atom(xcb_intern_atom_reply(
connection(),
xcb_intern_atom_unchecked(connection(), false, name.length(), name.constData()),
nullptr));
if (!atom.isNull()) {
xa_version = atom->atom;
}
}
}
xcb_atom_t make_selection_atom(int screen_P) {
if (screen_P < 0)
screen_P = QX11Info::appScreen();
QByteArray screen(QByteArrayLiteral("WM_S"));
screen.append(QByteArray::number(screen_P));
ScopedCPointer<xcb_intern_atom_reply_t> atom(xcb_intern_atom_reply(
connection(),
xcb_intern_atom_unchecked(connection(), false, screen.length(), screen.constData()),
nullptr));
if (atom.isNull()) {
return XCB_ATOM_NONE;
}
return atom->atom;
}
static xcb_atom_t xa_version;
};
xcb_atom_t KWinSelectionOwner::xa_version = XCB_ATOM_NONE;
//************************************
// ApplicationX11
//************************************
ApplicationX11::ApplicationX11(int &argc, char **argv)
: Application(OperationModeX11, argc, argv)
, owner()
, m_replace(false)
{
setX11Connection(QX11Info::connection());
setX11RootWindow(QX11Info::appRootWindow());
}
ApplicationX11::~ApplicationX11()
{
setTerminating();
destroyCompositor();
destroyWorkspace();
if (!owner.isNull() && owner->ownerWindow() != XCB_WINDOW_NONE) // If there was no --replace (no new WM)
Xcb::setInputFocus(XCB_INPUT_FOCUS_POINTER_ROOT);
}
void ApplicationX11::setReplace(bool replace)
{
m_replace = replace;
}
void ApplicationX11::lostSelection()
{
sendPostedEvents();
destroyCompositor();
destroyWorkspace();
// Remove windowmanager privileges
Xcb::selectInput(rootWindow(), XCB_EVENT_MASK_PROPERTY_CHANGE);
quit();
}
static xcb_screen_t *findXcbScreen(xcb_connection_t *connection, int screen)
{
for (xcb_screen_iterator_t it = xcb_setup_roots_iterator(xcb_get_setup(connection));
it.rem;
--screen, xcb_screen_next(&it)) {
if (screen == 0) {
return it.data;
}
}
return nullptr;
}
void ApplicationX11::performStartup()
{
crashChecking();
if (Application::x11ScreenNumber() == -1) {
Application::setX11ScreenNumber(QX11Info::appScreen());
}
setX11DefaultScreen(findXcbScreen(x11Connection(), x11ScreenNumber()));
owner.reset(new KWinSelectionOwner(Application::x11ScreenNumber()));
connect(owner.data(), &KSelectionOwner::failedToClaimOwnership, []{
fputs(i18n("kwin: unable to claim manager selection, another wm running? (try using --replace)\n").toLocal8Bit().constData(), stderr);
::exit(1);
});
connect(owner.data(), &KSelectionOwner::lostOwnership, this, &ApplicationX11::lostSelection);
connect(owner.data(), &KSelectionOwner::claimedOwnership, [this]{
installNativeX11EventFilter();
// first load options - done internally by a different thread
createOptions();
// Check whether another windowmanager is running
const uint32_t maskValues[] = {XCB_EVENT_MASK_SUBSTRUCTURE_REDIRECT};
ScopedCPointer<xcb_generic_error_t> redirectCheck(xcb_request_check(connection(),
xcb_change_window_attributes_checked(connection(),
rootWindow(),
XCB_CW_EVENT_MASK,
maskValues)));
if (!redirectCheck.isNull()) {
fputs(i18n("kwin: another window manager is running (try using --replace)\n").toLocal8Bit().constData(), stderr);
if (!wasCrash()) // if this is a crash-restart, DrKonqi may have stopped the process w/o killing the connection
::exit(1);
}
createInput();
connect(platform(), &Platform::screensQueried, this,
[this] {
createWorkspace();
Xcb::sync(); // Trigger possible errors, there's still a chance to abort
notifyKSplash();
notifyStarted();
}
);
connect(platform(), &Platform::initFailed, this,
[] () {
std::cerr << "FATAL ERROR: backend failed to initialize, exiting now" << std::endl;
::exit(1);
}
);
platform()->init();
});
// we need to do an XSync here, otherwise the QPA might crash us later on
Xcb::sync();
owner->claim(m_replace || wasCrash(), true);
createAtoms();
}
bool ApplicationX11::notify(QObject* o, QEvent* e)
{
if (e->spontaneous() && Workspace::self()->workspaceEvent(e))
return true;
return QApplication::notify(o, e);
}
void ApplicationX11::setupCrashHandler()
{
KCrash::setEmergencySaveFunction(ApplicationX11::crashHandler);
}
void ApplicationX11::crashChecking()
{
setupCrashHandler();
if (crashes >= 4) {
// Something has gone seriously wrong
AlternativeWMDialog dialog;
QString cmd = QStringLiteral(KWIN_INTERNAL_NAME_X11);
if (dialog.exec() == QDialog::Accepted)
cmd = dialog.selectedWM();
else
::exit(1);
if (cmd.length() > 500) {
qCDebug(KWIN_CORE) << "Command is too long, truncating";
cmd = cmd.left(500);
}
qCDebug(KWIN_CORE) << "Starting" << cmd << "and exiting";
char buf[1024];
sprintf(buf, "%s &", cmd.toLatin1().data());
system(buf);
::exit(1);
}
if (crashes >= 2) {
// Disable compositing if we have had too many crashes
qCDebug(KWIN_CORE) << "Too many crashes recently, disabling compositing";
KConfigGroup compgroup(KSharedConfig::openConfig(), "Compositing");
compgroup.writeEntry("Enabled", false);
}
// Reset crashes count if we stay up for more that 15 seconds
QTimer::singleShot(15 * 1000, this, &Application::resetCrashesCount);
}
void ApplicationX11::notifyKSplash()
{
// Tell KSplash that KWin has started
QDBusMessage ksplashProgressMessage = QDBusMessage::createMethodCall(QStringLiteral("org.kde.KSplash"),
QStringLiteral("/KSplash"),
QStringLiteral("org.kde.KSplash"),
QStringLiteral("setStage"));
ksplashProgressMessage.setArguments(QList<QVariant>() << QStringLiteral("wm"));
QDBusConnection::sessionBus().asyncCall(ksplashProgressMessage);
}
void ApplicationX11::crashHandler(int signal)
{
crashes++;
fprintf(stderr, "Application::crashHandler() called with signal %d; recent crashes: %d\n", signal, crashes);
char cmd[1024];
sprintf(cmd, "%s --crashes %d &",
QFile::encodeName(QCoreApplication::applicationFilePath()).constData(), crashes);
sleep(1);
system(cmd);
}
} // namespace
int main(int argc, char * argv[])
{
KWin::Application::setupMalloc();
KWin::Application::setupLocalizedString();
int primaryScreen = 0;
xcb_connection_t *c = xcb_connect(nullptr, &primaryScreen);
if (!c || xcb_connection_has_error(c)) {
fprintf(stderr, "%s: FATAL ERROR while trying to open display %s\n",
argv[0], qgetenv("DISPLAY").constData());
exit(1);
}
const int number_of_screens = xcb_setup_roots_length(xcb_get_setup(c));
xcb_disconnect(c);
c = nullptr;
// multi head
auto isMultiHead = []() -> bool {
QByteArray multiHead = qgetenv("KDE_MULTIHEAD");
if (!multiHead.isEmpty()) {
return (multiHead.toLower() == "true");
}
return true;
};
if (number_of_screens != 1 && isMultiHead()) {
KWin::Application::setX11MultiHead(true);
KWin::Application::setX11ScreenNumber(primaryScreen);
int pos; // Temporarily needed to reconstruct DISPLAY var if multi-head
QByteArray display_name = qgetenv("DISPLAY");
if ((pos = display_name.lastIndexOf('.')) != -1)
display_name.remove(pos, 10); // 10 is enough to be sure we removed ".s"
for (int i = 0; i < number_of_screens; i++) {
// If execution doesn't pass by here, then kwin
// acts exactly as previously
if (i != KWin::Application::x11ScreenNumber() && fork() == 0) {
KWin::Application::setX11ScreenNumber(i);
QByteArray dBusSuffix = qgetenv("KWIN_DBUS_SERVICE_SUFFIX");
if (!dBusSuffix.isNull()) {
dBusSuffix.append(".");
}
dBusSuffix.append(QByteArrayLiteral("head-")).append(QByteArray::number(i));
qputenv("KWIN_DBUS_SERVICE_SUFFIX", dBusSuffix);
// Break here because we are the child process, we don't
// want to fork() anymore
break;
}
}
// In the next statement, display_name shouldn't contain a screen
// number. If it had it, it was removed at the "pos" check
const QString envir = QStringLiteral("DISPLAY=%1.%2")
.arg(display_name.data())
.arg(KWin::Application::x11ScreenNumber());
if (putenv(strdup(envir.toLatin1().constData()))) {
fprintf(stderr, "%s: WARNING: unable to set DISPLAY environment variable\n", argv[0]);
perror("putenv()");
}
}
if (signal(SIGTERM, KWin::sighandler) == SIG_IGN)
signal(SIGTERM, SIG_IGN);
if (signal(SIGINT, KWin::sighandler) == SIG_IGN)
signal(SIGINT, SIG_IGN);
if (signal(SIGHUP, KWin::sighandler) == SIG_IGN)
signal(SIGHUP, SIG_IGN);
signal(SIGPIPE, SIG_IGN);
// Disable the glib event loop integration, since it seems to be responsible
// for several bug reports about high CPU usage (bug #239963)
setenv("QT_NO_GLIB", "1", true);
// enforce xcb plugin, unfortunately command line switch has precedence
setenv("QT_QPA_PLATFORM", "xcb", true);
qunsetenv("QT_DEVICE_PIXEL_RATIO");
qunsetenv("QT_SCALE_FACTOR");
QCoreApplication::setAttribute(Qt::AA_DisableHighDpiScaling);
// KSMServer talks to us directly on DBus.
QCoreApplication::setAttribute(Qt::AA_DisableSessionManager);
KWin::ApplicationX11 a(argc, argv);
a.setupTranslator();
KWin::Application::createAboutData();
KQuickAddons::QtQuickSettings::init();
// disables vsync for any QtQuick windows we create (BUG 406180)
QSurfaceFormat format = QSurfaceFormat::defaultFormat();
format.setSwapInterval(0);
QSurfaceFormat::setDefaultFormat(format);
QCommandLineOption replaceOption(QStringLiteral("replace"), i18n("Replace already-running ICCCM2.0-compliant window manager"));
QCommandLineParser parser;
a.setupCommandLine(&parser);
parser.addOption(replaceOption);
#ifdef KWIN_BUILD_ACTIVITIES
QCommandLineOption noActivitiesOption(QStringLiteral("no-kactivities"),
i18n("Disable KActivities integration."));
parser.addOption(noActivitiesOption);
#endif
parser.process(a);
a.processCommandLine(&parser);
a.setReplace(parser.isSet(replaceOption));
#ifdef KWIN_BUILD_ACTIVITIES
if (parser.isSet(noActivitiesOption)) {
a.setUseKActivities(false);
}
#endif
// perform sanity checks
if (a.platformName().toLower() != QStringLiteral("xcb")) {
fprintf(stderr, "%s: FATAL ERROR expecting platform xcb but got platform %s\n",
argv[0], qPrintable(a.platformName()));
exit(1);
}
if (!QX11Info::display()) {
fprintf(stderr, "%s: FATAL ERROR KWin requires Xlib support in the xcb plugin. Do not configure Qt with -no-xcb-xlib\n",
argv[0]);
exit(1);
}
// find and load the X11 platform plugin
const auto plugins = KPluginLoader::findPluginsById(QStringLiteral("org.kde.kwin.platforms"),
QStringLiteral("KWinX11Platform"));
if (plugins.isEmpty()) {
std::cerr << "FATAL ERROR: KWin could not find the KWinX11Platform plugin" << std::endl;
return 1;
}
a.initPlatform(plugins.first());
if (!a.platform()) {
std::cerr << "FATAL ERROR: could not instantiate the platform plugin" << std::endl;
return 1;
}
a.start();
return a.exec();
}
#include "main_x11.moc"
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