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Let the fun begin: start a WaylandServer in kwin_wayland

Browse source 
The WaylandServer is at the moment only used to support starting an
Xwayland. It does not support Wayland clients yet, so don't get
excited.

For Xwayland it's using the trick of creating the Display before the
QApplication is created with manual event dispatching.
This commit is contained in:
Martin Gräßlin 2015-02-09 13:28:37 +01:00
parent f651007ebe
commit 47bdce074e
4 changed files with 190 additions and 11 deletions
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2
CMakeLists.txt
View file

@ -416,6 +416,7 @@ if(HAVE_WAYLAND)
${kwin_KDEINIT_SRCS}
screens_wayland.cpp
wayland_backend.cpp
wayland_server.cpp
)
if(KWIN_HAVE_EGL AND Wayland_Egl_FOUND)
set(kwin_KDEINIT_SRCS ${kwin_KDEINIT_SRCS} egl_wayland_backend.cpp)
@ -503,6 +504,7 @@ set(kwin_WAYLAND_LIBS
XCB::XTEST
XKB::XKB
KF5::WaylandClient
KF5::WaylandServer
)
set(kwin_WAYLAND_EGL_LIBS

60
main_wayland.cpp
View file

@ -21,8 +21,11 @@ along with this program. If not, see <http://www.gnu.org/licenses/>.
#include <config-kwin.h>
// kwin
#include "wayland_backend.h"
#include "wayland_server.h"
#include "xcbutils.h"
// KWayland
#include <KWayland/Server/display.h>
// KDE
#include <KLocalizedString>
// Qt
@ -109,7 +112,7 @@ void ApplicationWayland::performStartup()
* 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, bool rootless = false)
static int startXServer(const QByteArray &process, const QByteArray &display, bool rootless = false, const QByteArray &waylandSocket = QByteArray())
{
int pipeFds[2];
if (pipe(pipeFds) != 0) {
@ -140,6 +143,7 @@ static void startXServer(const QByteArray &process, const QByteArray &display, b
*index++ = const_cast<char*>(display.data());
}
*index++ = nullptr;
qputenv("WAYLAND_DISPLAY", waylandSocket.isEmpty() ? QByteArrayLiteral("wayland-0") : waylandSocket);
execvp(process.constData(), args);
close(pipeFds[1]);
exit(20);
@ -147,14 +151,14 @@ static void startXServer(const QByteArray &process, const QByteArray &display, b
// parent process - this is KWin
// reads from pipe, closes write side
close(pipeFds[1]);
return pipeFds[0];
}
static void readDisplay(int pipe)
{
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;
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();
@ -166,7 +170,7 @@ static void startXServer(const QByteArray &process, const QByteArray &display, b
setenv("DISPLAY", displayNumber.constData(), true);
// close our pipe
close(pipeFds[0]);
close(pipe);
}
} // namespace
@ -181,6 +185,7 @@ KWIN_EXPORT int kdemain(int argc, char * argv[])
bool rootlessXwayland = false;
QByteArray xDisplay;
QByteArray xServer;
QByteArray waylandSocket;
for (int i = 1; i < argc; ++i) {
QByteArray arg = QByteArray::fromRawData(argv[i], qstrlen(argv[i]));
if (arg == "-x" || arg == "--x-server") {
@ -206,16 +211,42 @@ KWIN_EXPORT int kdemain(int argc, char * argv[])
xDisplay = QByteArray::fromRawData(argv[i], qstrlen(argv[i]));
}
}
if (arg == "--socket" || arg == "-s") {
if (++i < argc) {
waylandSocket = QByteArray::fromRawData(argv[i], qstrlen(argv[i]));
}
continue;
}
if (arg.startsWith("--socket=")) {
waylandSocket = arg.mid(9);
}
}
KWin::WaylandServer *server = KWin::WaylandServer::create(nullptr);
server->init(waylandSocket);
int xDisplayPipe = -1;
if (startXephyr) {
KWin::startXServer(QByteArrayLiteral("Xephyr"), xDisplay);
xDisplayPipe = KWin::startXServer(QByteArrayLiteral("Xephyr"), xDisplay);
}
if (startXvfb) {
KWin::startXServer(QByteArrayLiteral("Xvfb"), xDisplay);
xDisplayPipe = KWin::startXServer(QByteArrayLiteral("Xvfb"), xDisplay);
}
if (startXwayland) {
KWin::startXServer(QByteArrayLiteral("Xwayland"), xDisplay, rootlessXwayland);
xDisplayPipe = KWin::startXServer(QByteArrayLiteral("Xwayland"), xDisplay, rootlessXwayland, waylandSocket);
fd_set rfds;
struct timeval tv;
tv.tv_sec = 0;
tv.tv_usec = 0;
do {
server->display()->dispatchEvents(1000);
FD_ZERO(&rfds);
FD_SET(xDisplayPipe, &rfds);
} while (select(xDisplayPipe + 1, &rfds, NULL, NULL, &tv) == 0);
}
if (xDisplayPipe != -1) {
KWin::readDisplay(xDisplayPipe);
}
KWin::Application::setupMalloc();
@ -242,6 +273,9 @@ KWIN_EXPORT int kdemain(int argc, char * argv[])
KWin::ApplicationWayland a(argc, argv);
a.setupTranslator();
server->setParent(&a);
server->display()->startLoop();
KWin::Application::createAboutData();
QCommandLineOption startXServerOption(QStringList({QStringLiteral("x"), QStringLiteral("x-server")}),
@ -252,12 +286,16 @@ KWIN_EXPORT int kdemain(int argc, char * argv[])
QCommandLineOption x11DisplayOption(QStringLiteral("display"),
i18n("The X11 Display to connect to. If not set next free number will be picked."),
QStringLiteral("display"));
QCommandLineOption waylandSocketOption(QStringList{QStringLiteral("s"), QStringLiteral("socket")},
i18n("Name of the Wayland socket to listen on. If not set \"wayland-0\" is used."),
QStringLiteral("socket"));
QCommandLineParser parser;
a.setupCommandLine(&parser);
parser.addOption(startXServerOption);
parser.addOption(xwaylandOption);
parser.addOption(x11DisplayOption);
parser.addOption(waylandSocketOption);
#if HAVE_INPUT
QCommandLineOption libinputOption(QStringLiteral("libinput"),
i18n("Enable libinput support for input events processing. Note: never use in a nested session."));

61
wayland_server.cpp Normal file
View file

@ -0,0 +1,61 @@
/********************************************************************
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"
#include <KWayland/Server/compositor_interface.h>
#include <KWayland/Server/display.h>
#include <KWayland/Server/output_interface.h>
#include <KWayland/Server/shell_interface.h>
using namespace KWayland::Server;
namespace KWin
{
KWIN_SINGLETON_FACTORY(WaylandServer)
WaylandServer::WaylandServer(QObject *parent)
: QObject(parent)
{
}
WaylandServer::~WaylandServer() = default;
void WaylandServer::init(const QByteArray &socketName)
{
m_display = new KWayland::Server::Display(this);
if (!socketName.isNull() && !socketName.isEmpty()) {
m_display->setSocketName(QString::fromUtf8(socketName));
}
m_display->start();
m_compositor = m_display->createCompositor(m_display);
m_compositor->create();
m_shell = m_display->createShell(m_display);
m_shell->create();
m_display->createShm();
// we need a dummy output
OutputInterface *output = m_display->createOutput(m_display);
output->setPhysicalSize(QSize(10, 10));
output->addMode(QSize(1024, 768));
output->create();
}
}

78
wayland_server.h Normal file
View file

@ -0,0 +1,78 @@
/********************************************************************
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/>.
*********************************************************************/
#ifndef KWIN_WAYLAND_SERVER_H
#define KWIN_WAYLAND_SERVER_H
#include <kwinglobals.h>
#include <QObject>
namespace KWayland
{
namespace Server
{
class CompositorInterface;
class Display;
class ShellInterface;
class SeatInterface;
class OutputInterface;
}
}
namespace KWin
{
class KWIN_EXPORT WaylandServer : public QObject
{
Q_OBJECT
public:
virtual ~WaylandServer();
void init(const QByteArray &socketName = QByteArray());
KWayland::Server::Display *display() {
return m_display;
}
KWayland::Server::CompositorInterface *compositor() {
return m_compositor;
}
KWayland::Server::SeatInterface *seat() {
return m_seat;
}
KWayland::Server::ShellInterface *shell() {
return m_shell;
}
private:
KWayland::Server::Display *m_display = nullptr;
KWayland::Server::CompositorInterface *m_compositor = nullptr;
KWayland::Server::SeatInterface *m_seat = nullptr;
KWayland::Server::ShellInterface *m_shell = nullptr;
KWIN_SINGLETON(WaylandServer)
};
inline
WaylandServer *waylandServer() {
return WaylandServer::self();
}
} // namespace KWin
#endif