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kwin/xwl/xwayland.cpp

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/********************************************************************
KWin - the KDE window manager
This file is part of the KDE project.
Copyright 2014 Martin Gräßlin <mgraesslin@kde.org>
Copyright 2019 Roman Gilg <subdiff@gmail.com>
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 "xwayland.h"
#include "databridge.h"
#include "main_wayland.h"
#include "utils.h"
#include "wayland_server.h"
#include "xcbutils.h"
#include <KLocalizedString>
#include <KSelectionOwner>
#include <QAbstractEventDispatcher>
#include <QFile>
#include <QFutureWatcher>
#include <QProcess>
#include <QSocketNotifier>
#include <QThread>
#include <QtConcurrentRun>
// system
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#if HAVE_SYS_PROCCTL_H
#include <unistd.h>
#endif
#include <sys/socket.h>
#include <iostream>
static void readDisplay(int pipe)
{
QFile readPipe;
if (!readPipe.open(pipe, QIODevice::ReadOnly)) {
std::cerr << "FATAL ERROR failed to open pipe to start X Server" << 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() << std::endl;
setenv("DISPLAY", displayNumber.constData(), true);
// close our pipe
close(pipe);
}
namespace KWin
{
namespace Xwl
{
Xwayland *s_self = nullptr;
Xwayland *Xwayland::self()
{
return s_self;
}
Xwayland::Xwayland(ApplicationWaylandAbstract *app, QObject *parent)
: XwaylandInterface(parent)
, m_app(app)
{
s_self = this;
}
Xwayland::~Xwayland()
{
disconnect(m_xwaylandFailConnection);
if (m_app->x11Connection()) {
Xcb::setInputFocus(XCB_INPUT_FOCUS_POINTER_ROOT);
m_app->destroyAtoms();
Q_EMIT m_app->x11ConnectionAboutToBeDestroyed();
xcb_disconnect(m_app->x11Connection());
m_app->setX11Connection(nullptr);
}
if (m_xwaylandProcess) {
m_xwaylandProcess->terminate();
while (m_xwaylandProcess->state() != QProcess::NotRunning) {
m_app->processEvents(QEventLoop::WaitForMoreEvents);
}
waylandServer()->destroyXWaylandConnection();
}
s_self = nullptr;
}
void Xwayland::init()
{
int pipeFds[2];
if (pipe(pipeFds) != 0) {
std::cerr << "FATAL ERROR failed to create pipe to start Xwayland " << std::endl;
Q_EMIT criticalError(1);
return;
}
int sx[2];
if (socketpair(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC, 0, sx) < 0) {
std::cerr << "FATAL ERROR: failed to open socket to open XCB connection" << std::endl;
Q_EMIT criticalError(1);
return;
}
int fd = dup(sx[1]);
if (fd < 0) {
std::cerr << "FATAL ERROR: failed to open socket to open XCB connection" << std::endl;
Q_EMIT criticalError(20);
return;
}
const int waylandSocket = waylandServer()->createXWaylandConnection();
if (waylandSocket == -1) {
std::cerr << "FATAL ERROR: failed to open socket for Xwayland" << std::endl;
Q_EMIT criticalError(1);
return;
}
const int wlfd = dup(waylandSocket);
if (wlfd < 0) {
std::cerr << "FATAL ERROR: failed to open socket for Xwayland" << std::endl;
Q_EMIT criticalError(20);
return;
}
m_xcbConnectionFd = sx[0];
m_xwaylandProcess = new Process(this);
m_xwaylandProcess->setProcessChannelMode(QProcess::ForwardedErrorChannel);
m_xwaylandProcess->setProgram(QStringLiteral("Xwayland"));
QProcessEnvironment env = m_app->processStartupEnvironment();
env.insert("WAYLAND_SOCKET", QByteArray::number(wlfd));
env.insert("EGL_PLATFORM", QByteArrayLiteral("DRM"));
m_xwaylandProcess->setProcessEnvironment(env);
m_xwaylandProcess->setArguments({QStringLiteral("-displayfd"),
QString::number(pipeFds[1]),
QStringLiteral("-rootless"),
QStringLiteral("-wm"),
QString::number(fd)});
m_xwaylandFailConnection = connect(m_xwaylandProcess, static_cast<void (QProcess::*)(QProcess::ProcessError)>(&QProcess::error), this,
[this] (QProcess::ProcessError error) {
if (error == QProcess::FailedToStart) {
std::cerr << "FATAL ERROR: failed to start Xwayland" << std::endl;
} else {
std::cerr << "FATAL ERROR: Xwayland failed, going to exit now" << std::endl;
}
Q_EMIT criticalError(1);
}
);
const int xDisplayPipe = pipeFds[0];
connect(m_xwaylandProcess, &QProcess::started, this,
[this, xDisplayPipe] {
QFutureWatcher<void> *watcher = new QFutureWatcher<void>(this);
QObject::connect(watcher, &QFutureWatcher<void>::finished, this, &Xwayland::continueStartupWithX, Qt::QueuedConnection);
QObject::connect(watcher, &QFutureWatcher<void>::finished, watcher, &QFutureWatcher<void>::deleteLater, Qt::QueuedConnection);
watcher->setFuture(QtConcurrent::run(readDisplay, xDisplayPipe));
}
);
m_xwaylandProcess->start();
close(pipeFds[1]);
}
void Xwayland::prepareDestroy()
{
delete m_dataBridge;
m_dataBridge = nullptr;
}
void Xwayland::createX11Connection()
{
int screenNumber = 0;
xcb_connection_t *c = nullptr;
if (m_xcbConnectionFd == -1) {
c = xcb_connect(nullptr, &screenNumber);
} else {
c = xcb_connect_to_fd(m_xcbConnectionFd, nullptr);
}
if (int error = xcb_connection_has_error(c)) {
std::cerr << "FATAL ERROR: Creating connection to XServer failed: " << error << std::endl;
Q_EMIT criticalError(1);
return;
}
xcb_screen_iterator_t iter = xcb_setup_roots_iterator(xcb_get_setup(c));
m_xcbScreen = iter.data;
Q_ASSERT(m_xcbScreen);
m_app->setX11Connection(c);
// we don't support X11 multi-head in Wayland
m_app->setX11ScreenNumber(screenNumber);
m_app->setX11RootWindow(defaultScreen()->root);
}
void Xwayland::continueStartupWithX()
{
createX11Connection();
xcb_connection_t *xcbConn = m_app->x11Connection();
if (!xcbConn) {
// about to quit
Q_EMIT criticalError(1);
return;
}
QSocketNotifier *notifier = new QSocketNotifier(xcb_get_file_descriptor(xcbConn), QSocketNotifier::Read, this);
auto processXcbEvents = [this, xcbConn] {
while (auto event = xcb_poll_for_event(xcbConn)) {
if (m_dataBridge->filterEvent(event)) {
free(event);
continue;
}
long result = 0;
QThread::currentThread()->eventDispatcher()->filterNativeEvent(QByteArrayLiteral("xcb_generic_event_t"), event, &result);
free(event);
}
xcb_flush(xcbConn);
};
connect(notifier, &QSocketNotifier::activated, this, processXcbEvents);
connect(QThread::currentThread()->eventDispatcher(), &QAbstractEventDispatcher::aboutToBlock, this, processXcbEvents);
connect(QThread::currentThread()->eventDispatcher(), &QAbstractEventDispatcher::awake, this, processXcbEvents);
xcb_prefetch_extension_data(xcbConn, &xcb_xfixes_id);
m_xfixes = xcb_get_extension_data(xcbConn, &xcb_xfixes_id);
// create selection owner for WM_S0 - magic X display number expected by XWayland
KSelectionOwner owner("WM_S0", xcbConn, m_app->x11RootWindow());
owner.claim(true);
m_app->createAtoms();
m_app->setupEventFilters();
m_dataBridge = new DataBridge;
// 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);
Q_EMIT criticalError(1);
return;
}
auto env = m_app->processStartupEnvironment();
env.insert(QStringLiteral("DISPLAY"), QString::fromUtf8(qgetenv("DISPLAY")));
m_app->setProcessStartupEnvironment(env);
emit initialized();
Xcb::sync(); // Trigger possible errors, there's still a chance to abort
}
DragEventReply Xwayland::dragMoveFilter(Toplevel *target, const QPoint &pos)
{
if (!m_dataBridge) {
return DragEventReply::Wayland;
}
return m_dataBridge->dragMoveFilter(target, pos);
}
} // namespace Xwl
} // namespace KWin
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