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/*
SPDX-FileCopyrightText: 2014 Martin Gräßlin <mgraesslin@kde.org>
SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
*/
#include "wayland/compositor.h"
#include "wayland/display.h"
#include "wayland/output.h"
#include "wayland/seat.h"
#include "wayland/xdgshell.h"
#include "fakeoutput.h"
#include <QFile>
#include <QGuiApplication>
#include <private/qeventdispatcher_glib_p.h>
#include <iostream>
#include <sys/select.h>
#include <unistd.h>
static int startXServer()
{
const QByteArray process = QByteArrayLiteral("Xwayland");
int pipeFds[2];
if (pipe(pipeFds) != 0) {
std::cerr << "FATAL ERROR failed to create pipe to start X Server " << process.constData() << std::endl;
exit(1);
}
pid_t pid = fork();
if (pid == 0) {
// child process - should be turned into Xwayland
// writes to pipe, closes read side
close(pipeFds[0]);
char fdbuf[16];
sprintf(fdbuf, "%d", pipeFds[1]);
execlp(process.constData(), process.constData(), "-displayfd", fdbuf, (char *)nullptr);
close(pipeFds[1]);
exit(20);
}
// parent process - this is the wayland server
// reads from pipe, closes write side
close(pipeFds[1]);
return pipeFds[0];
}
static void readDisplayFromPipe(int pipe)
{
QFile readPipe;
if (!readPipe.open(pipe, QIODevice::ReadOnly)) {
std::cerr << "FATAL ERROR failed to open pipe to start X Server XWayland" << 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);
}
int main(int argc, char **argv)
{
using namespace KWin;
// set our own event dispatcher to be able to dispatch events before the event loop is started
QAbstractEventDispatcher *eventDispatcher = new QEventDispatcherGlib();
QCoreApplication::setEventDispatcher(eventDispatcher);
// first create the Server and setup with minimum to get an XWayland connected
KWin::Display display;
display.start();
display.createShm();
new CompositorInterface(&display, &display);
new XdgShellInterface(&display, &display);
auto outputHandle = std::make_unique<FakeOutput>();
outputHandle->setMode(QSize(1024, 768), 60000);
outputHandle->setPhysicalSize(QSize(10, 10));
auto outputInterface = std::make_unique<OutputInterface>(&display, outputHandle.get());
// starts XWayland by forking and opening a pipe
const int pipe = startXServer();
if (pipe == -1) {
exit(1);
}
fd_set rfds;
struct timeval tv;
tv.tv_sec = 0;
tv.tv_usec = 0;
do {
eventDispatcher->processEvents(QEventLoop::WaitForMoreEvents);
FD_ZERO(&rfds);
FD_SET(pipe, &rfds);
} while (select(pipe + 1, &rfds, nullptr, nullptr, &tv) == 0);
// now Xwayland is ready and we can read the pipe to get the display
readDisplayFromPipe(pipe);
QGuiApplication app(argc, argv);
new SeatInterface(&display, QStringLiteral("testSeat0"));
return app.exec();
}
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