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kwin/main.cpp

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/********************************************************************
KWin - the KDE window manager
This file is part of the KDE project.
Copyright (C) 1999, 2000 Matthias Ettrich <ettrich@kde.org>
Copyright (C) 2003 Lubos Lunak <l.lunak@kde.org>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*********************************************************************/
#include "main.h"
#include "config-workspace.h"
// kwin
#include "atoms.h"
#include "options.h"
#include "sm.h"
#include "workspace.h"
#include "xcbutils.h"
// KDE workspace
#include <ksmserver_interface.h>
// KDE
#include <KDE/KAboutData>
#include <KDE/KConfig>
#include <KDE/KConfigGroup>
#include <KDE/KCrash>
#include <KDE/KLocalizedString>
// Qt
#include <qplatformdefs.h>
#include <QDebug>
#include <QComboBox>
#include <qcommandlineparser.h>
#include <QDialog>
#include <QDialogButtonBox>
#include <QLabel>
#include <QPushButton>
#include <QQuickWindow>
#include <QStandardPaths>
#include <QVBoxLayout>
#include <QtDBus/QtDBus>
#include <QX11Info>
// TODO: remove once QX11Info provides the X screen
#include <X11/Xlib.h>
// system
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif // HAVE_UNISTD_H
#ifdef HAVE_MALLOC_H
#include <malloc.h>
#endif // HAVE_MALLOC_H
namespace KWin
{
Options* options;
Atoms* atoms;
int screen_number = -1;
bool is_multihead = false;
//************************************
// KWinSelectionOwner
//************************************
KWinSelectionOwner::KWinSelectionOwner(int screen_P)
: KSelectionOwner(make_selection_atom(screen_P), screen_P)
{
}
xcb_atom_t KWinSelectionOwner::make_selection_atom(int screen_P)
{
if (screen_P < 0)
screen_P = DefaultScreen(display());
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;
}
void KWinSelectionOwner::getAtoms()
{
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;
}
}
}
void KWinSelectionOwner::replyTargets(xcb_atom_t property_P, xcb_window_t requestor_P)
{
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);
}
bool KWinSelectionOwner::genericReply(xcb_atom_t target_P, xcb_atom_t property_P, xcb_window_t requestor_P)
{
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;
}
xcb_atom_t KWinSelectionOwner::xa_version = XCB_ATOM_NONE;
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_NAME));
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;
};
int Application::crashes = 0;
Application::Application(int &argc, char **argv)
: QApplication(argc, argv)
, owner(screen_number)
, m_eventFilter(new XcbEventFilter())
, m_replace(false)
, m_configLock(false)
, m_operationMode(OperationModeX11)
{
}
void Application::setConfigLock(bool lock)
{
m_configLock = lock;
}
void Application::setReplace(bool replace)
{
m_replace = replace;
}
Application::OperationMode Application::operationMode() const
{
return m_operationMode;
}
void Application::setOperationMode(OperationMode mode)
{
m_operationMode = mode;
}
bool Application::shouldUseWaylandForCompositing() const
{
return m_operationMode == OperationModeWaylandAndX11;
}
bool Application::requiresCompositing() const
{
return shouldUseWaylandForCompositing();
}
void Application::start()
{
setQuitOnLastWindowClosed(false);
KSharedConfig::Ptr config = KSharedConfig::openConfig();
if (!config->isImmutable() && m_configLock) {
// TODO: This shouldn't be necessary
//config->setReadOnly( true );
config->reparseConfiguration();
}
if (screen_number == -1)
screen_number = QX11Info::appScreen();
connect(&owner, &KSelectionOwner::failedToClaimOwnership, []{
fputs(i18n("kwin: unable to claim manager selection, another wm running? (try using --replace)\n").toLocal8Bit().constData(), stderr);
::exit(1);
});
connect(&owner, SIGNAL(lostOwnership()), SLOT(lostSelection()));
connect(&owner, &KSelectionOwner::claimedOwnership, [this]{
// we want all QQuickWindows with an alpha buffer
QQuickWindow::setDefaultAlphaBuffer(true);
installNativeEventFilter(m_eventFilter.data());
// first load options - done internally by a different thread
options = new Options;
// 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);
::exit(1);
}
atoms->retrieveHelpers();
// This tries to detect compositing options and can use GLX. GLX problems
// (X errors) shouldn't cause kwin to abort, so this is out of the
// critical startup section where x errors cause kwin to abort.
// create workspace.
(void) new Workspace(isSessionRestored());
Xcb::sync(); // Trigger possible errors, there's still a chance to abort
// 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);
});
crashChecking();
// we need to do an XSync here, otherwise the QPA might crash us later on
Xcb::sync();
owner.claim(m_replace, true);
atoms = new Atoms;
}
Application::~Application()
{
delete Workspace::self();
if (owner.ownerWindow() != XCB_WINDOW_NONE) // If there was no --replace (no new WM)
Xcb::setInputFocus(XCB_INPUT_FOCUS_POINTER_ROOT);
delete options;
delete atoms;
}
void Application::crashChecking()
{
KCrash::setEmergencySaveFunction(Application::crashHandler);
if (crashes >= 4) {
// Something has gone seriously wrong
AlternativeWMDialog dialog;
QString cmd = QStringLiteral(KWIN_NAME);
if (dialog.exec() == QDialog::Accepted)
cmd = dialog.selectedWM();
else
::exit(1);
if (cmd.length() > 500) {
qDebug() << "Command is too long, truncating";
cmd = cmd.left(500);
}
qDebug() << "Starting" << cmd << "and exiting";
char buf[1024];
sprintf(buf, "%s &", cmd.toAscii().data());
system(buf);
::exit(1);
}
if (crashes >= 2) {
// Disable compositing if we have had too many crashes
qDebug() << "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, SLOT(resetCrashesCount()));
}
void Application::lostSelection()
{
sendPostedEvents();
delete Workspace::self();
// Remove windowmanager privileges
Xcb::selectInput(rootWindow(), XCB_EVENT_MASK_PROPERTY_CHANGE);
quit();
}
bool Application::notify(QObject* o, QEvent* e)
{
if (Workspace::self()->workspaceEvent(e))
return true;
return QApplication::notify(o, e);
}
static void sighandler(int)
{
QApplication::exit();
}
void Application::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);
}
void Application::resetCrashesCount()
{
crashes = 0;
}
void Application::setCrashCount(int count)
{
crashes = count;
}
bool Application::wasCrash()
{
return crashes > 0;
}
bool XcbEventFilter::nativeEventFilter(const QByteArray &eventType, void *message, long int *result)
{
Q_UNUSED(result)
if (!Workspace::self()) {
// Workspace not yet created
return false;
}
if (eventType != "xcb_generic_event_t") {
return false;
}
return Workspace::self()->workspaceEvent(static_cast<xcb_generic_event_t *>(message));
}
} // namespace
static const char version[] = KWIN_VERSION_STRING;
static const char description[] = I18N_NOOP("KDE window manager");
extern "C"
KWIN_EXPORT int kdemain(int argc, char * argv[])
{
#ifdef M_TRIM_THRESHOLD
// Prevent fragmentation of the heap by malloc (glibc).
//
// The default threshold is 128*1024, which can result in a large memory usage
// due to fragmentation especially if we use the raster graphicssystem. On the
// otherside if the threshold is too low, free() starts to permanently ask the kernel
// about shrinking the heap.
#ifdef HAVE_UNISTD_H
const int pagesize = sysconf(_SC_PAGESIZE);
#else
const int pagesize = 4*1024;
#endif // HAVE_UNISTD_H
mallopt(M_TRIM_THRESHOLD, 5*pagesize);
#endif // M_TRIM_THRESHOLD
QLoggingCategory::setFilterRules(QStringLiteral("aurorae.debug = true\n") +
QStringLiteral("kwineffects.debug = true"));
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));
// 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::is_multihead = true;
KWin::screen_number = primaryScreen;
int pos; // Temporarily needed to reconstruct DISPLAY var if multi-head
QByteArray display_name = qgetenv("DISPLAY");
xcb_disconnect(c);
c = nullptr;
if ((pos = display_name.lastIndexOf('.')) != -1)
display_name.remove(pos, 10); // 10 is enough to be sure we removed ".s"
QString envir;
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::screen_number && fork() == 0) {
KWin::screen_number = i;
// 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
envir.sprintf("DISPLAY=%s.%d", display_name.data(), KWin::screen_number);
if (putenv(strdup(envir.toAscii().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);
// 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);
org::kde::KSMServerInterface ksmserver(QStringLiteral("org.kde.ksmserver"), QStringLiteral("/KSMServer"), QDBusConnection::sessionBus());
ksmserver.suspendStartup(QStringLiteral(KWIN_NAME));
KWin::Application a(argc, argv);
a.setApplicationName(QStringLiteral(KWIN_NAME));
a.setApplicationVersion(QStringLiteral(KWIN_VERSION_STRING));
a.setApplicationDisplayName(i18n("KWin"));
KAboutData aboutData(QStringLiteral(KWIN_NAME), // The program name used internally
QString(), // The message catalog name. If null, program name is used instead
i18n("KWin"), // A displayable program name string
QStringLiteral(KWIN_VERSION_STRING), // The program version string
i18n(description), // Short description of what the app does
KAboutData::License_GPL, // The license this code is released under
i18n("(c) 1999-2013, The KDE Developers")); // Copyright Statement
aboutData.addAuthor(i18n("Matthias Ettrich"), QString(), QStringLiteral("ettrich@kde.org"));
aboutData.addAuthor(i18n("Cristian Tibirna"), QString(), QStringLiteral("tibirna@kde.org"));
aboutData.addAuthor(i18n("Daniel M. Duley"), QString(), QStringLiteral("mosfet@kde.org"));
aboutData.addAuthor(i18n("Luboš Luňák"), QString(), QStringLiteral("l.lunak@kde.org"));
aboutData.addAuthor(i18n("Martin Gräßlin"), i18n("Maintainer"), QStringLiteral("mgraesslin@kde.org"));
QCommandLineOption lockOption(QStringLiteral("lock"), i18n("Disable configuration options"));
QCommandLineOption replaceOption(QStringLiteral("replace"), i18n("Replace already-running ICCCM2.0-compliant window manager"));
QCommandLineOption crashesOption(QStringLiteral("crashes"), i18n("Indicate that KWin has recently crashed n times"), QStringLiteral("n"));
QCommandLineParser parser;
parser.setApplicationDescription(i18n("KDE window manager"));
parser.addVersionOption();
parser.addHelpOption();
parser.addOption(lockOption);
parser.addOption(replaceOption);
parser.addOption(crashesOption);
parser.process(a);
KWin::Application::setCrashCount(parser.value(crashesOption).toInt());
a.setConfigLock(parser.isSet(lockOption));
a.setReplace(parser.isSet(replaceOption));
a.start();
ksmserver.resumeStartup(QStringLiteral(KWIN_NAME));
#warning SessionManager needs porting
#if KWIN_QT5_PORTING
KWin::SessionManager weAreIndeed;
#endif
KWin::SessionSaveDoneHelper helper;
#warning insertCatalog needs porting
#if KWIN_QT5_PORTING
KGlobal::locale()->insertCatalog("kwin_effects");
KGlobal::locale()->insertCatalog("kwin_scripts");
KGlobal::locale()->insertCatalog("kwin_scripting");
#endif
QString appname;
if (KWin::screen_number == 0)
appname = QStringLiteral("org.kde.kwin");
else
appname.sprintf("org.kde.kwin-screen-%d", KWin::screen_number);
QDBusConnection::sessionBus().interface()->registerService(
appname, QDBusConnectionInterface::DontQueueService);
return a.exec();
}
#include "main.moc"
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