ee186a68c4
Both Wayland and X11 backend are bound to the --windowed flag. Which one to create is decided whether DISPLAY or WAYLAND_DISPLAY env variables are set with Wayland having precedence over X11. Passing the display as command line argument overwrites the env variable and takes further precedence. E.g. if WAYLAND_DISPLAY is exported and --x11-display argument is provided, it will create X11 backend. Similarly there is now a --wayland-display command line argument. If no backend got created, kwin_wayland will exit. The singleton variant of WaylandBackend is adjusted to take the display as argument and pass it to the Connection.
442 lines
16 KiB
C++
442 lines
16 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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Copyright (C) 2014 Martin Gräßlin <mgraesslin@kde.org>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*********************************************************************/
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#include "main_wayland.h"
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#include "workspace.h"
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#include <config-kwin.h>
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// kwin
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#include "wayland_backend.h"
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#include "wayland_server.h"
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#include "xcbutils.h"
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#include "x11windowed_backend.h"
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// KWayland
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#include <KWayland/Server/display.h>
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#include <KWayland/Server/seat_interface.h>
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// KDE
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#include <KLocalizedString>
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// Qt
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#include <qplatformdefs.h>
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#include <QCommandLineParser>
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#include <QtConcurrentRun>
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#include <QFile>
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#include <QFutureWatcher>
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#include <QtCore/private/qeventdispatcher_unix_p.h>
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#include <QSocketNotifier>
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#include <QThread>
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#include <QDebug>
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#include <QWindow>
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// system
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif // HAVE_UNISTD_H
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#include <iostream>
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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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static int startXServer(int waylandSocket, int wmFd);
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static void readDisplay(int pipe);
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//************************************
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// ApplicationWayland
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//************************************
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ApplicationWayland::ApplicationWayland(int &argc, char **argv)
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: Application(OperationModeWaylandAndX11, argc, argv)
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{
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}
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ApplicationWayland::~ApplicationWayland()
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{
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destroyWorkspace();
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if (x11Connection()) {
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Xcb::setInputFocus(XCB_INPUT_FOCUS_POINTER_ROOT);
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xcb_disconnect(x11Connection());
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}
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}
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void ApplicationWayland::performStartup()
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{
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setOperationMode(m_startXWayland ? OperationModeXwayland : OperationModeWaylandAndX11);
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// first load options - done internally by a different thread
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createOptions();
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// try creating the Wayland Backend
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createInput();
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createBackend();
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if (X11WindowedBackend::self()) {
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continueStartupWithScreens();
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}
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}
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void ApplicationWayland::createBackend()
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{
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AbstractBackend *backend = nullptr;
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if (m_windowed) {
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if (!m_waylandDisplay.isEmpty()) {
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Wayland::WaylandBackend *b = Wayland::WaylandBackend::create(m_waylandDisplay, this);
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connect(b, &Wayland::WaylandBackend::connectionFailed, this,
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[] () {
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fputs(i18n("kwin_wayland: could not connect to Wayland Server, ensure WAYLAND_DISPLAY is set.\n").toLocal8Bit().constData(), stderr);
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::exit(1);
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}
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);
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connect(b, &Wayland::WaylandBackend::outputsChanged, this, &ApplicationWayland::continueStartupWithScreens);
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backend = b;
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}
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if (!backend && !m_x11Display.isEmpty()) {
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KWin::X11WindowedBackend *x11Backend = KWin::X11WindowedBackend::create(m_x11Display, m_backendSize, this);
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if (x11Backend->isValid()) {
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backend = x11Backend;
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waylandServer()->seat()->setHasPointer(true);
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waylandServer()->seat()->setHasKeyboard(true);
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} else {
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delete x11Backend;
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}
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}
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}
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if (!backend) {
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std::cerr << "FATAL ERROR: could not create a backend, exiting now" << std::endl;
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::exit(1);
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}
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}
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void ApplicationWayland::continueStartupWithScreens()
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{
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if (Wayland::WaylandBackend::self()) {
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disconnect(Wayland::WaylandBackend::self(), &Wayland::WaylandBackend::outputsChanged, this, &ApplicationWayland::continueStartupWithScreens);
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}
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createScreens();
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waylandServer()->initOutputs();
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if (!m_startXWayland) {
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continueStartupWithX();
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return;
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}
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createCompositor();
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int sx[2];
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if (socketpair(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC, 0, sx) < 0) {
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std::cerr << "FATAL ERROR: failed to open socket to open XCB connection" << std::endl;
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exit(1);
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return;
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}
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const int fd = waylandServer()->createXWaylandConnection();
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if (fd == -1) {
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std::cerr << "FATAL ERROR: failed to open socket for Xwayland" << std::endl;
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exit(1);
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return;
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}
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m_xcbConnectionFd = sx[0];
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const int xDisplayPipe = startXServer(fd, sx[1]);
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QFutureWatcher<void> *watcher = new QFutureWatcher<void>(this);
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QObject::connect(watcher, &QFutureWatcher<void>::finished, this, &ApplicationWayland::continueStartupWithX, Qt::QueuedConnection);
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QObject::connect(watcher, &QFutureWatcher<void>::finished, watcher, &QFutureWatcher<void>::deleteLater, Qt::QueuedConnection);
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watcher->setFuture(QtConcurrent::run(readDisplay, xDisplayPipe));
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}
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void ApplicationWayland::continueStartupWithX()
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{
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createX11Connection();
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xcb_connection_t *c = x11Connection();
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if (!c) {
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// about to quit
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return;
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}
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QSocketNotifier *notifier = new QSocketNotifier(xcb_get_file_descriptor(c), QSocketNotifier::Read, this);
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auto processXcbEvents = [this, c] {
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while (auto event = xcb_poll_for_event(c)) {
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updateX11Time(event);
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if (Workspace::self()) {
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Workspace::self()->workspaceEvent(event);
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}
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free(event);
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}
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xcb_flush(c);
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};
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connect(notifier, &QSocketNotifier::activated, this, processXcbEvents);
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connect(QThread::currentThread()->eventDispatcher(), &QAbstractEventDispatcher::aboutToBlock, this, processXcbEvents);
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connect(QThread::currentThread()->eventDispatcher(), &QAbstractEventDispatcher::awake, this, processXcbEvents);
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// create selection owner for WM_S0 - magic X display number expected by XWayland
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KSelectionOwner owner("WM_S0", c, x11RootWindow());
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owner.claim(true);
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createAtoms();
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setupEventFilters();
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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(connection(),
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xcb_change_window_attributes_checked(connection(),
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rootWindow(),
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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_wayland: an X11 window manager is running on the X11 Display.\n").toLocal8Bit().constData(), stderr);
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::exit(1);
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}
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// HACK: create a QWindow in a thread to force QtWayland to create the client buffer integration
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// this performs an eglInitialize which would block as it does a roundtrip to the Wayland server
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// in the main thread. By moving into a thread we get the initialize without hitting the problem
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// This needs to be done before creating the Workspace as from inside Workspace the dangerous code
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// gets hit in the main thread
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QFutureWatcher<void> *eglInitWatcher = new QFutureWatcher<void>(this);
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connect(eglInitWatcher, &QFutureWatcher<void>::finished, this,
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[this, eglInitWatcher] {
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eglInitWatcher->deleteLater();
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createWorkspace();
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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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}
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);
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eglInitWatcher->setFuture(QtConcurrent::run([] {
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QWindow w;
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w.setSurfaceType(QSurface::RasterGLSurface);
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w.create();
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}));
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}
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void ApplicationWayland::createX11Connection()
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{
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int screenNumber = 0;
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xcb_connection_t *c = nullptr;
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if (m_xcbConnectionFd == -1) {
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c = xcb_connect(nullptr, &screenNumber);
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} else {
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c = xcb_connect_to_fd(m_xcbConnectionFd, nullptr);
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}
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if (int error = xcb_connection_has_error(c)) {
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std::cerr << "FATAL ERROR: Creating connection to XServer failed: " << error << std::endl;
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exit(1);
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return;
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}
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setX11Connection(c);
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// we don't support X11 multi-head in Wayland
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setX11ScreenNumber(screenNumber);
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setX11RootWindow(defaultScreen()->root);
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}
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/**
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* Starts the Xwayland-Server.
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* The new process is started by forking into it.
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**/
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static int startXServer(int waylandSocket, int wmFd)
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{
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int pipeFds[2];
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if (pipe(pipeFds) != 0) {
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std::cerr << "FATAL ERROR failed to create pipe to start Xwayland " << std::endl;
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exit(1);
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}
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pid_t pid = fork();
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if (pid == 0) {
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// child process - should be turned into X-Server
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// writes to pipe, closes read side
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close(pipeFds[0]);
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char fdbuf[16];
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sprintf(fdbuf, "%d", pipeFds[1]);
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char wmfdbuf[16];
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int fd = dup(wmFd);
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if (fd < 0) {
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std::cerr << "FATAL ERROR: failed to open socket to open XCB connection" << std::endl;
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exit(20);
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return -1;
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}
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sprintf(wmfdbuf, "%d", fd);
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int wlfd = dup(waylandSocket);
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if (wlfd < 0) {
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std::cerr << "FATAL ERROR: failed to open socket for Xwayland" << std::endl;
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exit(20);
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return -1;
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}
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qputenv("WAYLAND_SOCKET", QByteArray::number(wlfd));
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execlp("Xwayland", "Xwayland", "-displayfd", fdbuf, "-rootless", "-wm", wmfdbuf, (char *)0);
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close(pipeFds[1]);
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exit(20);
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}
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// parent process - this is KWin
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// reads from pipe, closes write side
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close(pipeFds[1]);
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return pipeFds[0];
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}
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static void readDisplay(int pipe)
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{
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QFile readPipe;
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if (!readPipe.open(pipe, QIODevice::ReadOnly)) {
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std::cerr << "FATAL ERROR failed to open pipe to start X Server" << std::endl;
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exit(1);
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}
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QByteArray displayNumber = readPipe.readLine();
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displayNumber.prepend(QByteArray(":"));
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displayNumber.remove(displayNumber.size() -1, 1);
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std::cout << "X-Server started on display " << displayNumber.constData() << std::endl;
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setenv("DISPLAY", displayNumber.constData(), true);
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// close our pipe
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close(pipe);
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}
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} // namespace
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extern "C"
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KWIN_EXPORT int kdemain(int argc, char * argv[])
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{
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// process command line arguments to figure out whether we have to start Xwayland and the Wayland socket
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QByteArray waylandSocket;
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for (int i = 1; i < argc; ++i) {
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QByteArray arg = QByteArray::fromRawData(argv[i], qstrlen(argv[i]));
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if (arg == "--socket" || arg == "-s") {
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if (++i < argc) {
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waylandSocket = QByteArray::fromRawData(argv[i], qstrlen(argv[i]));
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}
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continue;
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}
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if (arg.startsWith("--socket=")) {
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waylandSocket = arg.mid(9);
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}
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}
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// set our own event dispatcher to be able to dispatch events before the event loop is started
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QAbstractEventDispatcher *eventDispatcher = new QEventDispatcherUNIX();
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QCoreApplication::setEventDispatcher(eventDispatcher);
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KWin::WaylandServer *server = KWin::WaylandServer::create(nullptr);
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server->init(waylandSocket);
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KWin::Application::setupMalloc();
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KWin::Application::setupLocalizedString();
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KWin::Application::setupLoggingCategoryFilters();
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if (signal(SIGTERM, KWin::sighandler) == SIG_IGN)
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signal(SIGTERM, SIG_IGN);
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if (signal(SIGINT, KWin::sighandler) == SIG_IGN)
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signal(SIGINT, SIG_IGN);
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if (signal(SIGHUP, KWin::sighandler) == SIG_IGN)
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signal(SIGHUP, SIG_IGN);
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// enforce wayland plugin, unfortunately command line switch has precedence
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setenv("QT_QPA_PLATFORM", "wayland", true);
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#if (QT_VERSION < QT_VERSION_CHECK(5, 4, 2))
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// TODO: remove warning once we depend on Qt 5.5
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qWarning() << "QtWayland 5.4.2 required, application might freeze if not present!";
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#endif
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qputenv("WAYLAND_SOCKET", QByteArray::number(server->createQtConnection()));
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KWin::ApplicationWayland a(argc, argv);
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a.setupTranslator();
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server->setParent(&a);
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KWin::Application::createAboutData();
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QCommandLineOption xwaylandOption(QStringLiteral("xwayland"),
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i18n("Start a rootless Xwayland server."));
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QCommandLineOption waylandSocketOption(QStringList{QStringLiteral("s"), QStringLiteral("socket")},
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i18n("Name of the Wayland socket to listen on. If not set \"wayland-0\" is used."),
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QStringLiteral("socket"));
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QCommandLineOption windowedOption(QStringLiteral("windowed"),
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i18n("Use a nested compositor in windowed mode."));
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QCommandLineOption x11DisplayOption(QStringLiteral("x11-display"),
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i18n("The X11 Display to use in windowed mode on platform X11."),
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QStringLiteral("display"));
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QCommandLineOption waylandDisplayOption(QStringLiteral("wayland-display"),
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i18n("The Wayland Display to use in windowed mode on platform Wayland."),
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QStringLiteral("display"));
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QCommandLineOption widthOption(QStringLiteral("width"),
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i18n("The width for windowed mode. Default width is 1024."),
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QStringLiteral("width"));
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widthOption.setDefaultValue(QString::number(1024));
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QCommandLineOption heightOption(QStringLiteral("height"),
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i18n("The height for windowed mode. Default height is 768."),
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QStringLiteral("height"));
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heightOption.setDefaultValue(QString::number(768));
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QCommandLineParser parser;
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a.setupCommandLine(&parser);
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parser.addOption(xwaylandOption);
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parser.addOption(waylandSocketOption);
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parser.addOption(windowedOption);
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parser.addOption(x11DisplayOption);
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parser.addOption(waylandDisplayOption);
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parser.addOption(widthOption);
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parser.addOption(heightOption);
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#if HAVE_INPUT
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QCommandLineOption libinputOption(QStringLiteral("libinput"),
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i18n("Enable libinput support for input events processing. Note: never use in a nested session."));
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parser.addOption(libinputOption);
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#endif
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parser.process(a);
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a.processCommandLine(&parser);
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#if HAVE_INPUT
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KWin::Application::setUseLibinput(parser.isSet(libinputOption));
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#endif
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a.setWindowed(parser.isSet(windowedOption));
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if (parser.isSet(windowedOption)) {
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bool ok = false;
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const int width = parser.value(widthOption).toInt(&ok);
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if (!ok) {
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std::cerr << "FATAL ERROR incorrect value for width" << std::endl;
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return 1;
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}
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const int height = parser.value(heightOption).toInt(&ok);
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if (!ok) {
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std::cerr << "FATAL ERROR incorrect value for height" << std::endl;
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return 1;
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}
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a.setBackendSize(QSize(width, height));
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if (parser.isSet(x11DisplayOption)) {
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a.setX11Display(parser.value(x11DisplayOption).toUtf8());
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} else if (!parser.isSet(waylandDisplayOption)) {
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a.setX11Display(qgetenv("DISPLAY"));
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}
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if (parser.isSet(waylandDisplayOption)) {
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a.setWaylandDisplay(parser.value(waylandDisplayOption).toUtf8());
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} else if (!parser.isSet(x11DisplayOption)) {
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a.setWaylandDisplay(qgetenv("WAYLAND_DISPLAY"));
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}
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}
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a.setStartXwayland(parser.isSet(xwaylandOption));
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a.start();
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return a.exec();
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}
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