kwin/main_wayland.cpp

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/********************************************************************
KWin - the KDE window manager
This file is part of the KDE project.
Copyright (C) 2014 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 "main_wayland.h"
#include <config-kwin.h>
// kwin
#include "wayland_backend.h"
#include "xcbutils.h"
// KDE
#include <KLocalizedString>
// Qt
#include <qplatformdefs.h>
#include <QCommandLineParser>
#include <QFile>
// system
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif // HAVE_UNISTD_H
#include <iostream>
namespace KWin
{
static void sighandler(int)
{
QApplication::exit();
}
//************************************
// ApplicationWayland
//************************************
ApplicationWayland::ApplicationWayland(int &argc, char **argv)
: Application(OperationModeWaylandAndX11, argc, argv)
{
}
ApplicationWayland::~ApplicationWayland()
{
destroyWorkspace();
delete Wayland::WaylandBackend::self();
// TODO: only if we support X11
Xcb::setInputFocus(XCB_INPUT_FOCUS_POINTER_ROOT);
}
void ApplicationWayland::performStartup()
{
// we don't support X11 multi-head in Wayland
Application::setX11ScreenNumber(0);
// we need to do an XSync here, otherwise the QPA might crash us later on
// TODO: remove
Xcb::sync();
createAtoms();
setupEventFilters();
// first load options - done internally by a different thread
createOptions();
// Check whether another windowmanager is running
const uint32_t maskValues[] = {XCB_EVENT_MASK_SUBSTRUCTURE_REDIRECT};
ScopedCPointer<xcb_generic_error_t> redirectCheck(xcb_request_check(connection(),
xcb_change_window_attributes_checked(connection(),
rootWindow(),
XCB_CW_EVENT_MASK,
maskValues)));
if (!redirectCheck.isNull()) {
fputs(i18n("kwin_wayland: an X11 window manager is running on the X11 Display.\n").toLocal8Bit().constData(), stderr);
::exit(1);
}
// try creating the Wayland Backend
Wayland::WaylandBackend *backend = Wayland::WaylandBackend::create();
connect(backend, &Wayland::WaylandBackend::connectionFailed, this,
[] () {
fputs(i18n("kwin_wayland: could not connect to Wayland Server, ensure WAYLAND_DISPLAY is set.\n").toLocal8Bit().constData(), stderr);
::exit(1);
}
);
createWorkspace();
Xcb::sync(); // Trigger possible errors, there's still a chance to abort
notifyKSplash();
}
/**
* Starts the X-Server with binary name @p process on @p display.
* The new process is started by forking into it.
**/
static void startXServer(const QByteArray &process, const QByteArray &display)
{
int pipeFds[2];
if (pipe(pipeFds) != 0) {
std::cerr << "FATAL ERROR failed to create pipe to start X Server "
<< process.constData()
<< " with arguments "
<< display.constData()
<< std::endl;
exit(1);
}
pid_t pid = fork();
if (pid == 0) {
// child process - should be turned into X-Server
// writes to pipe, closes read side
close(pipeFds[0]);
char fdbuf[16];
sprintf(fdbuf, "%d", pipeFds[1]);
execlp(process.constData(), process.constData(), "-displayfd", fdbuf, display.constData(), (char *)0);
close(pipeFds[1]);
exit(20);
}
// parent process - this is KWin
// reads from pipe, closes write side
close(pipeFds[1]);
QFile readPipe;
if (!readPipe.open(pipeFds[0], QIODevice::ReadOnly)) {
std::cerr << "FATAL ERROR failed to open pipe to start X Server "
<< process.constData()
<< " with arguments "
<< display.constData()
<< std::endl;
exit(1);
}
QByteArray displayNumber = readPipe.readLine();
displayNumber.prepend(QByteArray(":"));
displayNumber.remove(displayNumber.size() -1, 1);
std::cout << "X-Server started on display " << displayNumber.constData();
setenv("DISPLAY", displayNumber.constData(), true);
// close our pipe
close(pipeFds[0]);
}
} // namespace
extern "C"
KWIN_EXPORT int kdemain(int argc, char * argv[])
{
// process command line arguments to figure out whether we have to start an X-Server
bool startXephyr = false;
bool startXvfb = false;
bool startXwayland = false;
QByteArray xDisplay;
QByteArray xServer;
for (int i = 1; i < argc; ++i) {
QByteArray arg = argv[i];
if (arg == "-x" || arg == "--start-X-Server") {
if (++i < argc) {
xServer = argv[i];
}
startXephyr = (xServer == QStringLiteral("xephyr"));
startXvfb = (xServer == QStringLiteral("xvfb"));
startXwayland = (xServer == QStringLiteral("xwayland"));
if (!startXephyr && !startXvfb && !startXwayland) {
fprintf(stderr, "%s: FATAL ERROR unknown X-Server %s specified to start\n",
argv[0], qPrintable(xServer));
exit(1);
}
continue;
}
if (arg == "--display") {
if (++i < argc) {
xDisplay = argv[i];
}
}
}
if (startXephyr) {
KWin::startXServer(QByteArrayLiteral("Xephyr"), xDisplay);
}
if (startXvfb) {
KWin::startXServer(QByteArrayLiteral("Xvfb"), xDisplay);
}
if (startXwayland) {
KWin::startXServer(QByteArrayLiteral("Xwayland"), xDisplay);
}
KWin::Application::setupMalloc();
KWin::Application::setupLocalizedString();
KWin::Application::setupLoggingCategoryFilters();
// TODO: check whether we have a wayland connection
// Disable the glib event loop integration, since it seems to be responsible
// for several bug reports about high CPU usage (bug #239963)
setenv("QT_NO_GLIB", "1", true);
// enforce xcb plugin, unfortunately command line switch has precedence
// TODO: ensure it's not xcb once we support the Wayland QPA
setenv("QT_QPA_PLATFORM", "xcb", true);
if (signal(SIGTERM, KWin::sighandler) == SIG_IGN)
signal(SIGTERM, SIG_IGN);
if (signal(SIGINT, KWin::sighandler) == SIG_IGN)
signal(SIGINT, SIG_IGN);
if (signal(SIGHUP, KWin::sighandler) == SIG_IGN)
signal(SIGHUP, SIG_IGN);
KWin::ApplicationWayland a(argc, argv);
a.setupTranslator();
KWin::Application::createAboutData();
QCommandLineOption startXServerOption(QStringList({QStringLiteral("x"), QStringLiteral("x-server")}),
i18n("Start a nested X Server."),
QStringLiteral("xephyr|xvfb|xwayland"));
QCommandLineOption x11DisplayOption(QStringLiteral("display"),
i18n("The X11 Display to connect to, required if option x-server is used."),
QStringLiteral("display"));
QCommandLineParser parser;
a.setupCommandLine(&parser);
parser.addOption(startXServerOption);
parser.addOption(x11DisplayOption);
parser.process(a);
a.processCommandLine(&parser);
// perform sanity checks
// TODO: remove those two
if (a.platformName().toLower() != QStringLiteral("xcb")) {
fprintf(stderr, "%s: FATAL ERROR expecting platform xcb but got platform %s\n",
argv[0], qPrintable(a.platformName()));
exit(1);
}
if (!KWin::display()) {
fprintf(stderr, "%s: FATAL ERROR KWin requires Xlib support in the xcb plugin. Do not configure Qt with -no-xcb-xlib\n",
argv[0]);
exit(1);
}
a.start();
// TODO: is this still needed?
a.registerDBusService();
return a.exec();
}