wayland_server.cpp 22.2 KB
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/********************************************************************
 KWin - the KDE window manager
 This file is part of the KDE project.

Copyright (C) 2015 Martin Gräßlin <mgraesslin@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 "wayland_server.h"
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#include "client.h"
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#include "platform.h"
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#include "composite.h"
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#include "screens.h"
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#include "shell_client.h"
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#include "workspace.h"
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// Client
#include <KWayland/Client/connection_thread.h>
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#include <KWayland/Client/event_queue.h>
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#include <KWayland/Client/registry.h>
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#include <KWayland/Client/shm_pool.h>
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#include <KWayland/Client/surface.h>
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// Server
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#include <KWayland/Server/compositor_interface.h>
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#include <KWayland/Server/datadevicemanager_interface.h>
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#include <KWayland/Server/display.h>
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#include <KWayland/Server/dpms_interface.h>
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#include <KWayland/Server/idle_interface.h>
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#include <KWayland/Server/output_interface.h>
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#include <KWayland/Server/plasmashell_interface.h>
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#include <KWayland/Server/plasmawindowmanagement_interface.h>
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#include <KWayland/Server/pointerconstraints_interface.h>
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#include <KWayland/Server/pointergestures_interface.h>
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#include <KWayland/Server/qtsurfaceextension_interface.h>
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#include <KWayland/Server/seat_interface.h>
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#include <KWayland/Server/server_decoration_interface.h>
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#include <KWayland/Server/shadow_interface.h>
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#include <KWayland/Server/subcompositor_interface.h>
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#include <KWayland/Server/blur_interface.h>
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#include <KWayland/Server/shell_interface.h>
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#include <KWayland/Server/outputmanagement_interface.h>
#include <KWayland/Server/outputconfiguration_interface.h>
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#include <KWayland/Server/xdgshell_interface.h>
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// Qt
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#include <QThread>
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#include <QWindow>

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// system
#include <sys/types.h>
#include <sys/socket.h>
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#include <unistd.h>
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//screenlocker
#include <KScreenLocker/KsldApp>

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using namespace KWayland::Server;

namespace KWin
{

KWIN_SINGLETON_FACTORY(WaylandServer)

WaylandServer::WaylandServer(QObject *parent)
    : QObject(parent)
{
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    qRegisterMetaType<KWayland::Server::OutputInterface::DpmsMode>();
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    connect(kwinApp(), &Application::screensCreated, this, &WaylandServer::initOutputs);
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    connect(kwinApp(), &Application::x11ConnectionChanged, this, &WaylandServer::setupX11ClipboardSync);
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}

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WaylandServer::~WaylandServer()
{
    destroyInputMethodConnection();
}
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void WaylandServer::destroyInternalConnection()
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{
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    emit terminatingInternalClientConnection();
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    if (m_internalConnection.client) {
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        delete m_internalConnection.registry;
        delete m_internalConnection.shm;
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        dispatch();
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        m_internalConnection.client->deleteLater();
        m_internalConnection.clientThread->quit();
        m_internalConnection.clientThread->wait();
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        delete m_internalConnection.clientThread;
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        m_internalConnection.client = nullptr;
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        m_internalConnection.server->destroy();
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        m_internalConnection.server = nullptr;
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    }
}
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void WaylandServer::terminateClientConnections()
{
    destroyInternalConnection();
    destroyInputMethodConnection();
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    if (m_display) {
        const auto connections = m_display->connections();
        for (auto it = connections.begin(); it != connections.end(); ++it) {
            (*it)->destroy();
        }
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    }
}

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template <class T>
void WaylandServer::createSurface(T *surface)
{
    if (!Workspace::self()) {
        // it's possible that a Surface gets created before Workspace is created
        return;
    }
    if (surface->client() == m_xwayland.client) {
        // skip Xwayland clients, those are created using standard X11 way
        return;
    }
    if (surface->client() == m_screenLockerClientConnection) {
        ScreenLocker::KSldApp::self()->lockScreenShown();
    }
    auto client = new ShellClient(surface);
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    auto it = std::find_if(m_plasmaShellSurfaces.begin(), m_plasmaShellSurfaces.end(),
        [client] (PlasmaShellSurfaceInterface *surface) {
            return client->surface() == surface->surface();
        }
    );
    if (it != m_plasmaShellSurfaces.end()) {
        client->installPlasmaShellSurface(*it);
        m_plasmaShellSurfaces.erase(it);
    }
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    if (client->isInternal()) {
        m_internalClients << client;
    } else {
        m_clients << client;
    }
    if (client->readyForPainting()) {
        emit shellClientAdded(client);
    } else {
        connect(client, &ShellClient::windowShown, this, &WaylandServer::shellClientShown);
    }
}

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bool WaylandServer::init(const QByteArray &socketName, InitalizationFlags flags)
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{
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    m_initFlags = flags;
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    m_display = new KWayland::Server::Display(this);
    if (!socketName.isNull() && !socketName.isEmpty()) {
        m_display->setSocketName(QString::fromUtf8(socketName));
    }
    m_display->start();
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    if (!m_display->isRunning()) {
        return false;
    }
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    m_compositor = m_display->createCompositor(m_display);
    m_compositor->create();
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    connect(m_compositor, &CompositorInterface::surfaceCreated, this,
        [this] (SurfaceInterface *surface) {
            // check whether we have a Toplevel with the Surface's id
            Workspace *ws = Workspace::self();
            if (!ws) {
                // it's possible that a Surface gets created before Workspace is created
                return;
            }
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            if (surface->client() != xWaylandConnection()) {
                // setting surface is only relevat for Xwayland clients
                return;
            }
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            auto check = [surface] (const Toplevel *t) {
                return t->surfaceId() == surface->id();
            };
            if (Toplevel *t = ws->findToplevel(check)) {
                t->setSurface(surface);
            }
        }
    );
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    m_shell = m_display->createShell(m_display);
    m_shell->create();
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    connect(m_shell, &ShellInterface::surfaceCreated, this, &WaylandServer::createSurface<ShellSurfaceInterface>);
    m_xdgShell = m_display->createXdgShell(XdgShellInterfaceVersion::UnstableV5, m_display);
    m_xdgShell->create();
    connect(m_xdgShell, &XdgShellInterface::surfaceCreated, this, &WaylandServer::createSurface<XdgShellSurfaceInterface>);
    // TODO: verify seat and serial
    connect(m_xdgShell, &XdgShellInterface::popupCreated, this, &WaylandServer::createSurface<XdgShellPopupInterface>);
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    m_display->createShm();
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    m_seat = m_display->createSeat(m_display);
    m_seat->create();
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    m_display->createPointerGestures(PointerGesturesInterfaceVersion::UnstableV1, m_display)->create();
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    m_display->createPointerConstraints(PointerConstraintsInterfaceVersion::UnstableV1, m_display)->create();
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    auto ddm = m_display->createDataDeviceManager(m_display);
    ddm->create();
    connect(ddm, &DataDeviceManagerInterface::dataDeviceCreated, this,
        [this] (DataDeviceInterface *ddi) {
            if (ddi->client() == m_xclipbaordSync.client && m_xclipbaordSync.client != nullptr) {
                m_xclipbaordSync.ddi = QPointer<DataDeviceInterface>(ddi);
                connect(m_xclipbaordSync.ddi.data(), &DataDeviceInterface::selectionChanged, this,
                    [this] {
                        // testing whether the active client inherits Client
                        // it would be better to test for the keyboard focus, but we might get a clipboard update
                        // when the Client is already active, but no Surface is created yet.
                        if (workspace()->activeClient() && workspace()->activeClient()->inherits("KWin::Client")) {
                            m_seat->setSelection(m_xclipbaordSync.ddi.data());
                        }
                    }
                );
            }
        }
    );
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    m_display->createIdle(m_display)->create();
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    m_plasmaShell = m_display->createPlasmaShell(m_display);
    m_plasmaShell->create();
    connect(m_plasmaShell, &PlasmaShellInterface::surfaceCreated,
        [this] (PlasmaShellSurfaceInterface *surface) {
            if (ShellClient *client = findClient(surface->surface())) {
                client->installPlasmaShellSurface(surface);
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            } else {
                m_plasmaShellSurfaces << surface;
                connect(surface, &QObject::destroyed, this,
                    [this, surface] {
                        m_plasmaShellSurfaces.removeOne(surface);
                    }
                );
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            }
        }
    );
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    m_qtExtendedSurface = m_display->createQtSurfaceExtension(m_display);
    m_qtExtendedSurface->create();
    connect(m_qtExtendedSurface, &QtSurfaceExtensionInterface::surfaceCreated,
        [this] (QtExtendedSurfaceInterface *surface) {
            if (ShellClient *client = findClient(surface->surface())) {
                client->installQtExtendedSurface(surface);
            }
        }
    );
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    m_windowManagement = m_display->createPlasmaWindowManagement(m_display);
    m_windowManagement->create();
    m_windowManagement->setShowingDesktopState(PlasmaWindowManagementInterface::ShowingDesktopState::Disabled);
    connect(m_windowManagement, &PlasmaWindowManagementInterface::requestChangeShowingDesktop, this,
        [] (PlasmaWindowManagementInterface::ShowingDesktopState state) {
            if (!workspace()) {
                return;
            }
            bool set = false;
            switch (state) {
            case PlasmaWindowManagementInterface::ShowingDesktopState::Disabled:
                set = false;
                break;
            case PlasmaWindowManagementInterface::ShowingDesktopState::Enabled:
                set = true;
                break;
            default:
                Q_UNREACHABLE();
                break;
            }
            if (set == workspace()->showingDesktop()) {
                return;
            }
            workspace()->setShowingDesktop(set);
        }
    );
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    auto shadowManager = m_display->createShadowManager(m_display);
    shadowManager->create();
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    m_display->createDpmsManager(m_display)->create();
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    m_decorationManager = m_display->createServerSideDecorationManager(m_display);
    connect(m_decorationManager, &ServerSideDecorationManagerInterface::decorationCreated, this,
        [this] (ServerSideDecorationInterface *deco) {
            if (ShellClient *c = findClient(deco->surface())) {
                c->installServerSideDecoration(deco);
            }
        }
    );
    m_decorationManager->create();
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    m_outputManagement = m_display->createOutputManagement(m_display);
    connect(m_outputManagement, &OutputManagementInterface::configurationChangeRequested,
            this, [this](KWayland::Server::OutputConfigurationInterface *config) {
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                kwinApp()->platform()->configurationChangeRequested(config);
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    });
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    m_outputManagement->create();
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    m_display->createSubCompositor(m_display)->create();
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    return true;
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}

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void WaylandServer::shellClientShown(Toplevel *t)
{
    ShellClient *c = dynamic_cast<ShellClient*>(t);
    if (!c) {
        qCWarning(KWIN_CORE) << "Failed to cast a Toplevel which is supposed to be a ShellClient to ShellClient";
        return;
    }
    disconnect(c, &ShellClient::windowShown, this, &WaylandServer::shellClientShown);
    emit shellClientAdded(c);
}

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void WaylandServer::initWorkspace()
{
    if (m_windowManagement) {
        connect(workspace(), &Workspace::showingDesktopChanged, this,
            [this] (bool set) {
                using namespace KWayland::Server;
                m_windowManagement->setShowingDesktopState(set ?
                    PlasmaWindowManagementInterface::ShowingDesktopState::Enabled :
                    PlasmaWindowManagementInterface::ShowingDesktopState::Disabled
                );
            }
        );
    }
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    if (hasScreenLockerIntegration()) {
        ScreenLocker::KSldApp::self();
        ScreenLocker::KSldApp::self()->setWaylandDisplay(m_display);
        ScreenLocker::KSldApp::self()->setGreeterEnvironment(kwinApp()->processStartupEnvironment());
        ScreenLocker::KSldApp::self()->initialize();

        connect(ScreenLocker::KSldApp::self(), &ScreenLocker::KSldApp::greeterClientConnectionChanged, this,
            [this] () {
                m_screenLockerClientConnection = ScreenLocker::KSldApp::self()->greeterClientConnection();
            }
        );
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        connect(ScreenLocker::KSldApp::self(), &ScreenLocker::KSldApp::unlocked, this,
            [this] () {
                m_screenLockerClientConnection = nullptr;
            }
        );
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        if (m_initFlags.testFlag(InitalizationFlag::LockScreen)) {
            ScreenLocker::KSldApp::self()->lock(ScreenLocker::EstablishLock::Immediate);
        }
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    }
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    emit initialized();
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}
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void WaylandServer::initOutputs()
{
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    if (kwinApp()->platform()->handlesOutputs()) {
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        return;
    }
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    syncOutputsToWayland();
    connect(screens(), &Screens::changed, this,
        [this] {
            // when screens change we need to sync this to Wayland.
            // Unfortunately we don't have much information and cannot properly match a KWin screen
            // to a Wayland screen.
            // Thus we just recreate all outputs and delete the old ones
            const auto outputs = m_display->outputs();
            syncOutputsToWayland();
            qDeleteAll(outputs);
        }
    );
}

void WaylandServer::syncOutputsToWayland()
{
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    Screens *s = screens();
    Q_ASSERT(s);
    for (int i = 0; i < s->count(); ++i) {
        OutputInterface *output = m_display->createOutput(m_display);
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        output->setScale(s->scale(i));
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        const QRect &geo = s->geometry(i);
        output->setGlobalPosition(geo.topLeft());
        output->setPhysicalSize(geo.size() / 3.8);
        output->addMode(geo.size());
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        output->create();
    }
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}

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WaylandServer::SocketPairConnection WaylandServer::createConnection()
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{
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    SocketPairConnection ret;
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    int sx[2];
    if (socketpair(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC, 0, sx) < 0) {
        qCWarning(KWIN_CORE) << "Could not create socket";
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        return ret;
    }
    ret.connection = m_display->createClient(sx[0]);
    ret.fd = sx[1];
    return ret;
}

int WaylandServer::createXWaylandConnection()
{
    const auto socket = createConnection();
    if (!socket.connection) {
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        return -1;
    }
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    m_xwayland.client = socket.connection;
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    m_xwayland.destroyConnection = connect(m_xwayland.client, &KWayland::Server::ClientConnection::disconnected, this,
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        [] {
            qFatal("Xwayland Connection died");
        }
    );
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    return socket.fd;
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}

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void WaylandServer::destroyXWaylandConnection()
{
    if (!m_xwayland.client) {
        return;
    }
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    // first terminate the clipboard sync
    if (m_xclipbaordSync.process) {
        m_xclipbaordSync.process->terminate();
    }
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    disconnect(m_xwayland.destroyConnection);
    m_xwayland.client->destroy();
    m_xwayland.client = nullptr;
}

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int WaylandServer::createInputMethodConnection()
{
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    const auto socket = createConnection();
    if (!socket.connection) {
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        return -1;
    }
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    m_inputMethodServerConnection = socket.connection;
    return socket.fd;
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}

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void WaylandServer::destroyInputMethodConnection()
{
    if (!m_inputMethodServerConnection) {
        return;
    }
    m_inputMethodServerConnection->destroy();
    m_inputMethodServerConnection = nullptr;
}

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int WaylandServer::createXclipboardSyncConnection()
{
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    const auto socket = createConnection();
    if (!socket.connection) {
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        return -1;
    }
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    m_xclipbaordSync.client = socket.connection;
    return socket.fd;
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}

void WaylandServer::setupX11ClipboardSync()
{
    if (m_xclipbaordSync.process) {
        return;
    }

    int socket = dup(createXclipboardSyncConnection());
    if (socket == -1) {
        delete m_xclipbaordSync.client;
        m_xclipbaordSync.client = nullptr;
        return;
    }
    if (socket >= 0) {
        QProcessEnvironment environment = kwinApp()->processStartupEnvironment();
        environment.insert(QStringLiteral("WAYLAND_SOCKET"), QByteArray::number(socket));
        environment.insert(QStringLiteral("DISPLAY"), QString::fromUtf8(qgetenv("DISPLAY")));
        environment.remove("WAYLAND_DISPLAY");
        m_xclipbaordSync.process = new Process(this);
        m_xclipbaordSync.process->setProcessChannelMode(QProcess::ForwardedErrorChannel);
        auto finishedSignal = static_cast<void (QProcess::*)(int, QProcess::ExitStatus)>(&QProcess::finished);
        connect(m_xclipbaordSync.process, finishedSignal, this,
            [this] {
                m_xclipbaordSync.process->deleteLater();
                m_xclipbaordSync.process = nullptr;
                m_xclipbaordSync.ddi.clear();
                m_xclipbaordSync.client->destroy();
                m_xclipbaordSync.client = nullptr;
                // TODO: restart
            }
        );
        m_xclipbaordSync.process->setProcessEnvironment(environment);
        m_xclipbaordSync.process->start(QStringLiteral(KWIN_XCLIPBOARD_SYNC_BIN));
    }
}

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void WaylandServer::createInternalConnection()
{
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    const auto socket = createConnection();
    if (!socket.connection) {
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        return;
    }
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    m_internalConnection.server = socket.connection;
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    using namespace KWayland::Client;
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    m_internalConnection.client = new ConnectionThread();
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    m_internalConnection.client->setSocketFd(socket.fd);
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    m_internalConnection.clientThread = new QThread;
    m_internalConnection.client->moveToThread(m_internalConnection.clientThread);
    m_internalConnection.clientThread->start();

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    connect(m_internalConnection.client, &ConnectionThread::connected, this,
        [this] {
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            Registry *registry = new Registry(this);
            EventQueue *eventQueue = new EventQueue(this);
            eventQueue->setup(m_internalConnection.client);
            registry->setEventQueue(eventQueue);
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            registry->create(m_internalConnection.client);
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            m_internalConnection.registry = registry;
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            connect(registry, &Registry::shmAnnounced, this,
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                [this] (quint32 name, quint32 version) {
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                    m_internalConnection.shm = m_internalConnection.registry->createShmPool(name, version, this);
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                }
            );
            registry->setup();
        }
    );
    m_internalConnection.client->initConnection();
}

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void WaylandServer::removeClient(ShellClient *c)
{
    m_clients.removeAll(c);
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    m_internalClients.removeAll(c);
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    emit shellClientRemoved(c);
}

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void WaylandServer::dispatch()
{
    if (!m_display) {
        return;
    }
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    if (m_internalConnection.server) {
        m_internalConnection.server->flush();
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    }
    m_display->dispatchEvents(0);
}

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static ShellClient *findClientInList(const QList<ShellClient*> &clients, quint32 id)
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{
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    auto it = std::find_if(clients.begin(), clients.end(),
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        [id] (ShellClient *c) {
            return c->windowId() == id;
        }
    );
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    if (it == clients.end()) {
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        return nullptr;
    }
    return *it;
}

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static ShellClient *findClientInList(const QList<ShellClient*> &clients, KWayland::Server::SurfaceInterface *surface)
{
    auto it = std::find_if(clients.begin(), clients.end(),
        [surface] (ShellClient *c) {
            return c->surface() == surface;
        }
    );
    if (it == clients.end()) {
        return nullptr;
    }
    return *it;
}

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ShellClient *WaylandServer::findClient(quint32 id) const
{
    if (id == 0) {
        return nullptr;
    }
    if (ShellClient *c = findClientInList(m_clients, id)) {
        return c;
    }
    if (ShellClient *c = findClientInList(m_internalClients, id)) {
        return c;
    }
    return nullptr;
}

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ShellClient *WaylandServer::findClient(SurfaceInterface *surface) const
{
    if (!surface) {
        return nullptr;
    }
    if (ShellClient *c = findClientInList(m_clients, surface)) {
        return c;
    }
    if (ShellClient *c = findClientInList(m_internalClients, surface)) {
        return c;
    }
    return nullptr;
}

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AbstractClient *WaylandServer::findAbstractClient(SurfaceInterface *surface) const
{
    return findClient(surface);
}

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ShellClient *WaylandServer::findClient(QWindow *w) const
{
    if (!w) {
        return nullptr;
    }
    auto it = std::find_if(m_internalClients.constBegin(), m_internalClients.constEnd(),
        [w] (const ShellClient *c) {
            return c->internalWindow() == w;
        }
    );
    if (it != m_internalClients.constEnd()) {
        return *it;
    }
    return nullptr;
}

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quint32 WaylandServer::createWindowId(SurfaceInterface *surface)
{
    auto it = m_clientIds.constFind(surface->client());
    quint16 clientId = 0;
    if (it != m_clientIds.constEnd()) {
        clientId = it.value();
    } else {
        clientId = createClientId(surface->client());
    }
    Q_ASSERT(clientId != 0);
    quint32 id = clientId;
    // TODO: this does not prevent that two surfaces of same client get same id
    id = (id << 16) | (surface->id() & 0xFFFF);
    if (findClient(id)) {
        qCWarning(KWIN_CORE) << "Invalid client windowId generated:" << id;
        return 0;
    }
    return id;
}

quint16 WaylandServer::createClientId(ClientConnection *c)
{
    auto ids = m_clientIds.values().toSet();
    quint16 id = 1;
    if (!ids.isEmpty()) {
        for (quint16 i = ids.count() + 1; i >= 1 ; i--) {
            if (!ids.contains(i)) {
                id = i;
                break;
            }
        }
    }
    Q_ASSERT(!ids.contains(id));
    m_clientIds.insert(c, id);
    connect(c, &ClientConnection::disconnected, this,
        [this] (ClientConnection *c) {
            m_clientIds.remove(c);
        }
    );
    return id;
}

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bool WaylandServer::isScreenLocked() const
{
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    if (!hasScreenLockerIntegration()) {
        return false;
    }
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    return ScreenLocker::KSldApp::self()->lockState() == ScreenLocker::KSldApp::Locked ||
           ScreenLocker::KSldApp::self()->lockState() == ScreenLocker::KSldApp::AcquiringLock;
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}

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bool WaylandServer::hasScreenLockerIntegration() const
{
    return !m_initFlags.testFlag(InitalizationFlag::NoLockScreenIntegration);
}

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}