501 lines
17 KiB
C++
501 lines
17 KiB
C++
/*
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KWin - the KDE window manager
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This file is part of the KDE project.
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SPDX-FileCopyrightText: 1999, 2000 Matthias Ettrich <ettrich@kde.org>
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SPDX-FileCopyrightText: 2003 Lubos Lunak <l.lunak@kde.org>
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SPDX-FileCopyrightText: 2014 Martin Gräßlin <mgraesslin@kde.org>
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SPDX-License-Identifier: GPL-2.0-or-later
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*/
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#include "main_x11.h"
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#include <config-kwin.h>
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#include "platform.h"
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#include "sm.h"
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#include "utils/xcbutils.h"
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#include "workspace.h"
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#include <KConfigGroup>
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#include <KCrash>
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#include <KLocalizedString>
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#include <KPluginMetaData>
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#include <KSelectionOwner>
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#include <QComboBox>
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#include <QCommandLineParser>
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#include <QDialog>
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#include <QDialogButtonBox>
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#include <QFile>
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#include <QLabel>
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#include <QPushButton>
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#include <QSurfaceFormat>
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#include <QVBoxLayout>
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#include <qplatformdefs.h>
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#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
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#include <private/qtx11extras_p.h>
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#else
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#include <QX11Info>
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#endif
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#include <QtDBus>
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// system
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#include <iostream>
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#include <unistd.h>
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Q_LOGGING_CATEGORY(KWIN_CORE, "kwin_core", QtWarningMsg)
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namespace KWin
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{
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static void sighandler(int)
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{
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QApplication::exit();
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}
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class AlternativeWMDialog : public QDialog
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{
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public:
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AlternativeWMDialog()
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: QDialog()
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{
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QWidget *mainWidget = new QWidget(this);
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QVBoxLayout *layout = new QVBoxLayout(mainWidget);
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QString text = i18n("KWin is unstable.\n"
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"It seems to have crashed several times in a row.\n"
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"You can select another window manager to run:");
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QLabel *textLabel = new QLabel(text, mainWidget);
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layout->addWidget(textLabel);
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wmList = new QComboBox(mainWidget);
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wmList->setEditable(true);
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layout->addWidget(wmList);
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addWM(QStringLiteral("metacity"));
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addWM(QStringLiteral("openbox"));
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addWM(QStringLiteral("fvwm2"));
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addWM(QStringLiteral(KWIN_INTERNAL_NAME_X11));
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QVBoxLayout *mainLayout = new QVBoxLayout(this);
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mainLayout->addWidget(mainWidget);
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QDialogButtonBox *buttons = new QDialogButtonBox(QDialogButtonBox::Ok | QDialogButtonBox::Cancel, this);
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buttons->button(QDialogButtonBox::Ok)->setDefault(true);
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connect(buttons, &QDialogButtonBox::accepted, this, &QDialog::accept);
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connect(buttons, &QDialogButtonBox::rejected, this, &QDialog::reject);
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mainLayout->addWidget(buttons);
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raise();
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}
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void addWM(const QString &wm)
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{
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// TODO: Check if WM is installed
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if (!QStandardPaths::findExecutable(wm).isEmpty()) {
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wmList->addItem(wm);
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}
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}
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QString selectedWM() const
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{
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return wmList->currentText();
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}
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private:
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QComboBox *wmList;
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};
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class KWinSelectionOwner : public KSelectionOwner
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{
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Q_OBJECT
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public:
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explicit KWinSelectionOwner(int screen)
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: KSelectionOwner(make_selection_atom(screen), screen)
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{
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}
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private:
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bool genericReply(xcb_atom_t target_P, xcb_atom_t property_P, xcb_window_t requestor_P) override
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{
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if (target_P == xa_version) {
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int32_t version[] = {2, 0};
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xcb_change_property(kwinApp()->x11Connection(), XCB_PROP_MODE_REPLACE, requestor_P,
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property_P, XCB_ATOM_INTEGER, 32, 2, version);
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} else {
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return KSelectionOwner::genericReply(target_P, property_P, requestor_P);
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}
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return true;
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}
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void replyTargets(xcb_atom_t property_P, xcb_window_t requestor_P) override
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{
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KSelectionOwner::replyTargets(property_P, requestor_P);
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xcb_atom_t atoms[1] = {xa_version};
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// PropModeAppend !
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xcb_change_property(kwinApp()->x11Connection(), XCB_PROP_MODE_APPEND, requestor_P,
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property_P, XCB_ATOM_ATOM, 32, 1, atoms);
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}
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void getAtoms() override
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{
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KSelectionOwner::getAtoms();
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if (xa_version == XCB_ATOM_NONE) {
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const QByteArray name(QByteArrayLiteral("VERSION"));
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ScopedCPointer<xcb_intern_atom_reply_t> atom(xcb_intern_atom_reply(
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kwinApp()->x11Connection(),
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xcb_intern_atom_unchecked(kwinApp()->x11Connection(), false, name.length(), name.constData()),
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nullptr));
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if (!atom.isNull()) {
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xa_version = atom->atom;
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}
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}
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}
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xcb_atom_t make_selection_atom(int screen_P)
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{
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if (screen_P < 0) {
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screen_P = QX11Info::appScreen();
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}
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QByteArray screen(QByteArrayLiteral("WM_S"));
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screen.append(QByteArray::number(screen_P));
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ScopedCPointer<xcb_intern_atom_reply_t> atom(xcb_intern_atom_reply(
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kwinApp()->x11Connection(),
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xcb_intern_atom_unchecked(kwinApp()->x11Connection(), false, screen.length(), screen.constData()),
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nullptr));
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if (atom.isNull()) {
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return XCB_ATOM_NONE;
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}
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return atom->atom;
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}
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static xcb_atom_t xa_version;
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};
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xcb_atom_t KWinSelectionOwner::xa_version = XCB_ATOM_NONE;
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//************************************
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// ApplicationX11
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//************************************
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ApplicationX11::ApplicationX11(int &argc, char **argv)
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: Application(OperationModeX11, argc, argv)
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, owner()
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, m_replace(false)
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{
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setX11Connection(QX11Info::connection());
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setX11RootWindow(QX11Info::appRootWindow());
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}
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ApplicationX11::~ApplicationX11()
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{
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setTerminating();
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destroyCompositor();
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destroyWorkspace();
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if (!owner.isNull() && owner->ownerWindow() != XCB_WINDOW_NONE) { // If there was no --replace (no new WM)
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Xcb::setInputFocus(XCB_INPUT_FOCUS_POINTER_ROOT);
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}
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}
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void ApplicationX11::setReplace(bool replace)
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{
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m_replace = replace;
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}
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void ApplicationX11::lostSelection()
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{
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sendPostedEvents();
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destroyCompositor();
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destroyWorkspace();
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// Remove windowmanager privileges
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Xcb::selectInput(kwinApp()->x11RootWindow(), XCB_EVENT_MASK_PROPERTY_CHANGE);
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removeNativeX11EventFilter();
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quit();
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}
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static xcb_screen_t *findXcbScreen(xcb_connection_t *connection, int screen)
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{
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for (xcb_screen_iterator_t it = xcb_setup_roots_iterator(xcb_get_setup(connection));
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it.rem;
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--screen, xcb_screen_next(&it)) {
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if (screen == 0) {
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return it.data;
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}
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}
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return nullptr;
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}
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void ApplicationX11::performStartup()
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{
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crashChecking();
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if (Application::x11ScreenNumber() == -1) {
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Application::setX11ScreenNumber(QX11Info::appScreen());
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}
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setX11DefaultScreen(findXcbScreen(x11Connection(), x11ScreenNumber()));
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owner.reset(new KWinSelectionOwner(Application::x11ScreenNumber()));
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connect(owner.data(), &KSelectionOwner::failedToClaimOwnership, [] {
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fputs(i18n("kwin: unable to claim manager selection, another wm running? (try using --replace)\n").toLocal8Bit().constData(), stderr);
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::exit(1);
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});
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connect(owner.data(), &KSelectionOwner::lostOwnership, this, &ApplicationX11::lostSelection);
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connect(owner.data(), &KSelectionOwner::claimedOwnership, this, [this] {
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installNativeX11EventFilter();
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// first load options - done internally by a different thread
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createOptions();
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if (!platform()->initialize()) {
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std::exit(1);
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}
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createColorManager();
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// Check whether another windowmanager is running
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const uint32_t maskValues[] = {XCB_EVENT_MASK_SUBSTRUCTURE_REDIRECT};
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ScopedCPointer<xcb_generic_error_t> redirectCheck(xcb_request_check(kwinApp()->x11Connection(),
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xcb_change_window_attributes_checked(kwinApp()->x11Connection(),
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kwinApp()->x11RootWindow(),
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XCB_CW_EVENT_MASK,
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maskValues)));
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if (!redirectCheck.isNull()) {
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fputs(i18n("kwin: another window manager is running (try using --replace)\n").toLocal8Bit().constData(), stderr);
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if (!wasCrash()) { // if this is a crash-restart, DrKonqi may have stopped the process w/o killing the connection
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::exit(1);
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}
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}
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createInput();
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createWorkspace();
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createPlugins();
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Xcb::sync(); // Trigger possible errors, there's still a chance to abort
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notifyKSplash();
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notifyStarted();
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});
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// we need to do an XSync here, otherwise the QPA might crash us later on
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Xcb::sync();
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owner->claim(m_replace || wasCrash(), true);
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createAtoms();
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}
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bool ApplicationX11::notify(QObject *o, QEvent *e)
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{
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if (e->spontaneous() && Workspace::self()->workspaceEvent(e)) {
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return true;
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}
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return QApplication::notify(o, e);
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}
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void ApplicationX11::setupCrashHandler()
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{
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KCrash::setEmergencySaveFunction(ApplicationX11::crashHandler);
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}
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void ApplicationX11::crashChecking()
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{
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setupCrashHandler();
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if (crashes >= 4) {
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// Something has gone seriously wrong
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AlternativeWMDialog dialog;
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QString cmd = QStringLiteral(KWIN_INTERNAL_NAME_X11);
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if (dialog.exec() == QDialog::Accepted) {
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cmd = dialog.selectedWM();
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} else {
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::exit(1);
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}
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if (cmd.length() > 500) {
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qCDebug(KWIN_CORE) << "Command is too long, truncating";
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cmd = cmd.left(500);
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}
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qCDebug(KWIN_CORE) << "Starting" << cmd << "and exiting";
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char buf[1024];
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sprintf(buf, "%s &", cmd.toLatin1().data());
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system(buf);
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::exit(1);
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}
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if (crashes >= 2) {
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// Disable compositing if we have had too many crashes
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qCDebug(KWIN_CORE) << "Too many crashes recently, disabling compositing";
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KConfigGroup compgroup(KSharedConfig::openConfig(), "Compositing");
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compgroup.writeEntry("Enabled", false);
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}
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// Reset crashes count if we stay up for more that 15 seconds
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QTimer::singleShot(15 * 1000, this, &Application::resetCrashesCount);
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}
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void ApplicationX11::notifyKSplash()
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{
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// Tell KSplash that KWin has started
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QDBusMessage ksplashProgressMessage = QDBusMessage::createMethodCall(QStringLiteral("org.kde.KSplash"),
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QStringLiteral("/KSplash"),
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QStringLiteral("org.kde.KSplash"),
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QStringLiteral("setStage"));
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ksplashProgressMessage.setArguments(QList<QVariant>() << QStringLiteral("wm"));
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QDBusConnection::sessionBus().asyncCall(ksplashProgressMessage);
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}
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void ApplicationX11::crashHandler(int signal)
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{
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crashes++;
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fprintf(stderr, "Application::crashHandler() called with signal %d; recent crashes: %d\n", signal, crashes);
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char cmd[1024];
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sprintf(cmd, "%s --crashes %d &",
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QFile::encodeName(QCoreApplication::applicationFilePath()).constData(), crashes);
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sleep(1);
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system(cmd);
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}
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} // namespace
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int main(int argc, char *argv[])
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{
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KWin::Application::setupMalloc();
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KWin::Application::setupLocalizedString();
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int primaryScreen = 0;
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xcb_connection_t *c = xcb_connect(nullptr, &primaryScreen);
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if (!c || xcb_connection_has_error(c)) {
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fprintf(stderr, "%s: FATAL ERROR while trying to open display %s\n",
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argv[0], qgetenv("DISPLAY").constData());
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exit(1);
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}
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const int number_of_screens = xcb_setup_roots_length(xcb_get_setup(c));
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xcb_disconnect(c);
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c = nullptr;
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// multi head
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auto isMultiHead = []() -> bool {
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QByteArray multiHead = qgetenv("KDE_MULTIHEAD");
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if (!multiHead.isEmpty()) {
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return (multiHead.toLower() == "true");
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}
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return true;
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};
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if (number_of_screens != 1 && isMultiHead()) {
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KWin::Application::setX11MultiHead(true);
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KWin::Application::setX11ScreenNumber(primaryScreen);
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int pos; // Temporarily needed to reconstruct DISPLAY var if multi-head
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QByteArray display_name = qgetenv("DISPLAY");
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if ((pos = display_name.lastIndexOf('.')) != -1) {
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display_name.remove(pos, 10); // 10 is enough to be sure we removed ".s"
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}
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for (int i = 0; i < number_of_screens; i++) {
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// If execution doesn't pass by here, then kwin
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// acts exactly as previously
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if (i != KWin::Application::x11ScreenNumber() && fork() == 0) {
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KWin::Application::setX11ScreenNumber(i);
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QByteArray dBusSuffix = qgetenv("KWIN_DBUS_SERVICE_SUFFIX");
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if (!dBusSuffix.isNull()) {
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dBusSuffix.append(".");
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}
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dBusSuffix.append(QByteArrayLiteral("head-")).append(QByteArray::number(i));
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qputenv("KWIN_DBUS_SERVICE_SUFFIX", dBusSuffix);
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// Break here because we are the child process, we don't
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// want to fork() anymore
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break;
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}
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}
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// In the next statement, display_name shouldn't contain a screen
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// number. If it had it, it was removed at the "pos" check
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const QString envir = QStringLiteral("DISPLAY=%1.%2")
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.arg(display_name.data())
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.arg(KWin::Application::x11ScreenNumber());
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if (putenv(strdup(envir.toLatin1().constData()))) {
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fprintf(stderr, "%s: WARNING: unable to set DISPLAY environment variable\n", argv[0]);
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perror("putenv()");
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}
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}
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if (signal(SIGTERM, KWin::sighandler) == SIG_IGN) {
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signal(SIGTERM, SIG_IGN);
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}
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if (signal(SIGINT, KWin::sighandler) == SIG_IGN) {
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signal(SIGINT, SIG_IGN);
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}
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if (signal(SIGHUP, KWin::sighandler) == SIG_IGN) {
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signal(SIGHUP, SIG_IGN);
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}
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signal(SIGPIPE, SIG_IGN);
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// Disable the glib event loop integration, since it seems to be responsible
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// for several bug reports about high CPU usage (bug #239963)
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setenv("QT_NO_GLIB", "1", true);
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// enforce xcb plugin, unfortunately command line switch has precedence
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setenv("QT_QPA_PLATFORM", "xcb", true);
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qunsetenv("QT_DEVICE_PIXEL_RATIO");
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qunsetenv("QT_SCALE_FACTOR");
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QCoreApplication::setAttribute(Qt::AA_DisableHighDpiScaling);
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// KSMServer talks to us directly on DBus.
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QCoreApplication::setAttribute(Qt::AA_DisableSessionManager);
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// For sharing thumbnails between our scene graph and qtquick.
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QCoreApplication::setAttribute(Qt::AA_ShareOpenGLContexts);
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QSurfaceFormat format = QSurfaceFormat::defaultFormat();
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// shared opengl contexts must have the same reset notification policy
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format.setOptions(QSurfaceFormat::ResetNotification);
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// disables vsync for any QtQuick windows we create (BUG 406180)
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format.setSwapInterval(0);
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QSurfaceFormat::setDefaultFormat(format);
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KWin::ApplicationX11 a(argc, argv);
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a.setupTranslator();
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KWin::Application::createAboutData();
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QCommandLineOption replaceOption(QStringLiteral("replace"), i18n("Replace already-running ICCCM2.0-compliant window manager"));
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QCommandLineParser parser;
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a.setupCommandLine(&parser);
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parser.addOption(replaceOption);
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#if KWIN_BUILD_ACTIVITIES
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QCommandLineOption noActivitiesOption(QStringLiteral("no-kactivities"),
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i18n("Disable KActivities integration."));
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parser.addOption(noActivitiesOption);
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#endif
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parser.process(a);
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a.processCommandLine(&parser);
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a.setReplace(parser.isSet(replaceOption));
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#if KWIN_BUILD_ACTIVITIES
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if (parser.isSet(noActivitiesOption)) {
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a.setUseKActivities(false);
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}
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#endif
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// perform sanity checks
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if (a.platformName().toLower() != QStringLiteral("xcb")) {
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fprintf(stderr, "%s: FATAL ERROR expecting platform xcb but got platform %s\n",
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argv[0], qPrintable(a.platformName()));
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exit(1);
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}
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if (!QX11Info::display()) {
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fprintf(stderr, "%s: FATAL ERROR KWin requires Xlib support in the xcb plugin. Do not configure Qt with -no-xcb-xlib\n",
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argv[0]);
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exit(1);
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}
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// find and load the X11 platform plugin
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const KPluginMetaData plugin = KPluginMetaData::findPluginById(QStringLiteral("org.kde.kwin.platforms"), QStringLiteral("KWinX11Platform"));
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if (!plugin.isValid()) {
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std::cerr << "FATAL ERROR: KWin could not find the KWinX11Platform plugin" << std::endl;
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return 1;
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}
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a.initPlatform(plugin);
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if (!a.platform()) {
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std::cerr << "FATAL ERROR: could not instantiate the platform plugin" << std::endl;
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return 1;
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}
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a.start();
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return a.exec();
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}
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#include "main_x11.moc"
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