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kwin/src/main_x11.cpp
Vlad Zahorodnii ade861d6de Refactor session code 
At the moment, the session code is far from being extensible. If we
decide to add support for libseatd, it will be a challenging task with
the current design of session management code. The goal of this
refactoring is to fix that.

Another motivation behind this change is to prepare session related code
for upstreaming to kwayland-server where it belongs.
2021-03-23 08:01:19 +00:00

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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", QtWarningMsg)
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);
removeNativeX11EventFilter();
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();
if (!platform()->initialize()) {
std::exit(1);
}
createColorManager();
// 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();
createWorkspace();
createPlugins();
Xcb::sync(); // Trigger possible errors, there's still a chance to abort
notifyKSplash();
notifyStarted();
});
// 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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