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kwin/main_wayland.cpp
Roman Gilg 732610bd8f [platforms/drm] Early platform and outputs teardown 
Summary:
Since we now use in the backends the OutputDeviceInterface for output data
all access must be complete before the Wayland server goes down. For that
introduce a new function to prepare shutdown in the backends.

While at it also remove the output deletion, since they get deleted through
Qt's object system leading to crashes on double free.

Test Plan: Shutdown works without seg faults in the Drm backend.

Reviewers: #kwin, zzag

Reviewed By: #kwin, zzag

Subscribers: zzag, kwin

Tags: #kwin

Maniphest Tasks: T11459

Differential Revision: https://phabricator.kde.org/D23602
2019-09-05 17:00:40 +02:00

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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 "composite.h"
#include "virtualkeyboard.h"
#include "workspace.h"
#include <config-kwin.h>
// kwin
#include "platform.h"
#include "effects.h"
#include "tabletmodemanager.h"
#include "wayland_server.h"
#include "xwl/xwayland.h"
// KWayland
#include <KWayland/Server/display.h>
#include <KWayland/Server/seat_interface.h>
// KDE
#include <KLocalizedString>
#include <KPluginLoader>
#include <KPluginMetaData>
#include <KCrash>
#include <KQuickAddons/QtQuickSettings>
// Qt
#include <qplatformdefs.h>
#include <QCommandLineParser>
#include <QFileInfo>
#include <QProcess>
#include <QStyle>
#include <QDebug>
#include <QWindow>
// system
#if HAVE_SYS_PRCTL_H
#include <sys/prctl.h>
#endif
#if HAVE_SYS_PROCCTL_H
#include <sys/procctl.h>
#endif
#if HAVE_LIBCAP
#include <sys/capability.h>
#endif
#include <sched.h>
#include <iostream>
#include <iomanip>
namespace KWin
{
static void sighandler(int)
{
QApplication::exit();
}
void disableDrKonqi()
{
KCrash::setDrKonqiEnabled(false);
}
// run immediately, before Q_CORE_STARTUP functions
// that would enable drkonqi
Q_CONSTRUCTOR_FUNCTION(disableDrKonqi)
enum class RealTimeFlags
{
DontReset,
ResetOnFork
};
namespace {
void gainRealTime(RealTimeFlags flags = RealTimeFlags::DontReset)
{
#if HAVE_SCHED_RESET_ON_FORK
const int minPriority = sched_get_priority_min(SCHED_RR);
struct sched_param sp;
sp.sched_priority = minPriority;
int policy = SCHED_RR;
if (flags == RealTimeFlags::ResetOnFork) {
policy |= SCHED_RESET_ON_FORK;
}
sched_setscheduler(0, policy, &sp);
#else
Q_UNUSED(flags);
#endif
}
}
//************************************
// ApplicationWayland
//************************************
ApplicationWayland::ApplicationWayland(int &argc, char **argv)
: ApplicationWaylandAbstract(OperationModeWaylandOnly, argc, argv)
{
}
ApplicationWayland::~ApplicationWayland()
{
setTerminating();
if (!waylandServer()) {
return;
}
if (auto *platform = kwinApp()->platform()) {
platform->prepareShutdown();
}
// need to unload all effects prior to destroying X connection as they might do X calls
if (effects) {
static_cast<EffectsHandlerImpl*>(effects)->unloadAllEffects();
}
if (m_xwayland) {
// needs to be done before workspace gets destroyed
m_xwayland->prepareDestroy();
}
destroyWorkspace();
waylandServer()->dispatch();
if (QStyle *s = style()) {
s->unpolish(this);
}
// kill Xwayland before terminating its connection
delete m_xwayland;
m_xwayland = nullptr;
waylandServer()->terminateClientConnections();
destroyCompositor();
}
void ApplicationWayland::performStartup()
{
if (m_startXWayland) {
setOperationMode(OperationModeXwayland);
}
// first load options - done internally by a different thread
createOptions();
waylandServer()->createInternalConnection();
// try creating the Wayland Backend
createInput();
// now libinput thread has been created, adjust scheduler to not leak into other processes
gainRealTime(RealTimeFlags::ResetOnFork);
VirtualKeyboard::create(this);
createBackend();
TabletModeManager::create(this);
}
void ApplicationWayland::createBackend()
{
connect(platform(), &Platform::screensQueried, this, &ApplicationWayland::continueStartupWithScreens);
connect(platform(), &Platform::initFailed, this,
[] () {
std::cerr << "FATAL ERROR: backend failed to initialize, exiting now" << std::endl;
QCoreApplication::exit(1);
}
);
platform()->init();
}
void ApplicationWayland::continueStartupWithScreens()
{
disconnect(kwinApp()->platform(), &Platform::screensQueried, this, &ApplicationWayland::continueStartupWithScreens);
createScreens();
WaylandCompositor::create();
connect(Compositor::self(), &Compositor::sceneCreated, this, &ApplicationWayland::continueStartupWithScene);
}
void ApplicationWayland::finalizeStartup()
{
if (m_xwayland) {
disconnect(m_xwayland, &Xwl::Xwayland::initialized, this, &ApplicationWayland::finalizeStartup);
}
startSession();
createWorkspace();
notifyKSplash();
}
void ApplicationWayland::continueStartupWithScene()
{
disconnect(Compositor::self(), &Compositor::sceneCreated, this, &ApplicationWayland::continueStartupWithScene);
if (operationMode() == OperationModeWaylandOnly) {
finalizeStartup();
return;
}
m_xwayland = new Xwl::Xwayland(this);
connect(m_xwayland, &Xwl::Xwayland::criticalError, this, [](int code) {
// we currently exit on Xwayland errors always directly
// TODO: restart Xwayland
std::cerr << "Xwayland had a critical error. Going to exit now." << std::endl;
exit(code);
});
connect(m_xwayland, &Xwl::Xwayland::initialized, this, &ApplicationWayland::finalizeStartup);
m_xwayland->init();
}
void ApplicationWayland::startSession()
{
if (!m_inputMethodServerToStart.isEmpty()) {
int socket = dup(waylandServer()->createInputMethodConnection());
if (socket >= 0) {
QProcessEnvironment environment = processStartupEnvironment();
environment.insert(QStringLiteral("WAYLAND_SOCKET"), QByteArray::number(socket));
environment.insert(QStringLiteral("QT_QPA_PLATFORM"), QStringLiteral("wayland"));
environment.remove("DISPLAY");
environment.remove("WAYLAND_DISPLAY");
QProcess *p = new Process(this);
p->setProcessChannelMode(QProcess::ForwardedErrorChannel);
auto finishedSignal = static_cast<void (QProcess::*)(int, QProcess::ExitStatus)>(&QProcess::finished);
connect(p, finishedSignal, this,
[this, p] {
if (waylandServer()) {
waylandServer()->destroyInputMethodConnection();
}
p->deleteLater();
}
);
p->setProcessEnvironment(environment);
p->start(m_inputMethodServerToStart);
p->waitForStarted();
}
}
// start session
if (!m_sessionArgument.isEmpty()) {
QProcess *p = new Process(this);
p->setProcessChannelMode(QProcess::ForwardedErrorChannel);
p->setProcessEnvironment(processStartupEnvironment());
auto finishedSignal = static_cast<void (QProcess::*)(int, QProcess::ExitStatus)>(&QProcess::finished);
connect(p, finishedSignal, this, [](int code, QProcess::ExitStatus status) {
if (status == QProcess::CrashExit) {
qWarning() << "Session process has crashed";
QCoreApplication::exit(-1);
return;
}
if (code) {
qWarning() << "Session process exited with code" << code;
}
QCoreApplication::exit(code);
});
p->start(m_sessionArgument);
}
// start the applications passed to us as command line arguments
if (!m_applicationsToStart.isEmpty()) {
for (const QString &application: m_applicationsToStart) {
// note: this will kill the started process when we exit
// this is going to happen anyway as we are the wayland and X server the app connects to
QProcess *p = new Process(this);
p->setProcessChannelMode(QProcess::ForwardedErrorChannel);
p->setProcessEnvironment(processStartupEnvironment());
p->start(application);
}
}
}
static const QString s_waylandPlugin = QStringLiteral("KWinWaylandWaylandBackend");
static const QString s_x11Plugin = QStringLiteral("KWinWaylandX11Backend");
static const QString s_fbdevPlugin = QStringLiteral("KWinWaylandFbdevBackend");
#if HAVE_DRM
static const QString s_drmPlugin = QStringLiteral("KWinWaylandDrmBackend");
#endif
#if HAVE_LIBHYBRIS
static const QString s_hwcomposerPlugin = QStringLiteral("KWinWaylandHwcomposerBackend");
#endif
static const QString s_virtualPlugin = QStringLiteral("KWinWaylandVirtualBackend");
static QString automaticBackendSelection()
{
if (qEnvironmentVariableIsSet("WAYLAND_DISPLAY")) {
return s_waylandPlugin;
}
if (qEnvironmentVariableIsSet("DISPLAY")) {
return s_x11Plugin;
}
#if HAVE_LIBHYBRIS
if (qEnvironmentVariableIsSet("ANDROID_ROOT")) {
return s_hwcomposerPlugin;
}
#endif
#if HAVE_DRM
return s_drmPlugin;
#endif
return s_fbdevPlugin;
}
static void disablePtrace()
{
#if HAVE_PR_SET_DUMPABLE
// check whether we are running under a debugger
const QFileInfo parent(QStringLiteral("/proc/%1/exe").arg(getppid()));
if (parent.isSymLink() &&
(parent.symLinkTarget().endsWith(QLatin1String("/gdb")) ||
parent.symLinkTarget().endsWith(QLatin1String("/gdbserver")) ||
parent.symLinkTarget().endsWith(QLatin1String("/lldb-server")))) {
// debugger, don't adjust
return;
}
// disable ptrace in kwin_wayland
prctl(PR_SET_DUMPABLE, 0);
#endif
#if HAVE_PROC_TRACE_CTL
// FreeBSD's rudimentary procfs does not support /proc/<pid>/exe
// We could use the P_TRACED flag of the process to find out
// if the process is being debugged ond FreeBSD.
int mode = PROC_TRACE_CTL_DISABLE;
procctl(P_PID, getpid(), PROC_TRACE_CTL, &mode);
#endif
}
static void unsetDumpable(int sig)
{
#if HAVE_PR_SET_DUMPABLE
prctl(PR_SET_DUMPABLE, 1);
#endif
signal(sig, SIG_IGN);
raise(sig);
return;
}
void dropNiceCapability()
{
#if HAVE_LIBCAP
cap_t caps = cap_get_proc();
if (!caps) {
return;
}
cap_value_t capList[] = { CAP_SYS_NICE };
if (cap_set_flag(caps, CAP_PERMITTED, 1, capList, CAP_CLEAR) == -1) {
cap_free(caps);
return;
}
if (cap_set_flag(caps, CAP_EFFECTIVE, 1, capList, CAP_CLEAR) == -1) {
cap_free(caps);
return;
}
cap_set_proc(caps);
cap_free(caps);
#endif
}
} // namespace
int main(int argc, char * argv[])
{
if (getuid() == 0) {
std::cerr << "kwin_wayland does not support running as root." << std::endl;
return 1;
}
KWin::disablePtrace();
KWin::Application::setupMalloc();
KWin::Application::setupLocalizedString();
KWin::gainRealTime();
KWin::dropNiceCapability();
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);
signal(SIGABRT, KWin::unsetDumpable);
signal(SIGSEGV, KWin::unsetDumpable);
signal(SIGPIPE, SIG_IGN);
// ensure that no thread takes SIGUSR
sigset_t userSignals;
sigemptyset(&userSignals);
sigaddset(&userSignals, SIGUSR1);
sigaddset(&userSignals, SIGUSR2);
pthread_sigmask(SIG_BLOCK, &userSignals, nullptr);
QProcessEnvironment environment = QProcessEnvironment::systemEnvironment();
// enforce our internal qpa plugin, unfortunately command line switch has precedence
setenv("QT_QPA_PLATFORM", "wayland-org.kde.kwin.qpa", true);
qunsetenv("QT_DEVICE_PIXEL_RATIO");
qputenv("QT_IM_MODULE", "qtvirtualkeyboard");
qputenv("QSG_RENDER_LOOP", "basic");
QCoreApplication::setAttribute(Qt::AA_UseHighDpiPixmaps);
KWin::ApplicationWayland a(argc, argv);
a.setupTranslator();
// reset QT_QPA_PLATFORM to a sane value for any processes started from KWin
setenv("QT_QPA_PLATFORM", "wayland", true);
KWin::Application::createAboutData();
KQuickAddons::QtQuickSettings::init();
const auto availablePlugins = KPluginLoader::findPlugins(QStringLiteral("org.kde.kwin.waylandbackends"));
auto hasPlugin = [&availablePlugins] (const QString &name) {
return std::any_of(availablePlugins.begin(), availablePlugins.end(),
[name] (const KPluginMetaData &plugin) {
return plugin.pluginId() == name;
}
);
};
const bool hasSizeOption = hasPlugin(KWin::s_x11Plugin) || hasPlugin(KWin::s_virtualPlugin);
const bool hasOutputCountOption = hasPlugin(KWin::s_x11Plugin);
const bool hasX11Option = hasPlugin(KWin::s_x11Plugin);
const bool hasVirtualOption = hasPlugin(KWin::s_virtualPlugin);
const bool hasWaylandOption = hasPlugin(KWin::s_waylandPlugin);
const bool hasFramebufferOption = hasPlugin(KWin::s_fbdevPlugin);
#if HAVE_DRM
const bool hasDrmOption = hasPlugin(KWin::s_drmPlugin);
#endif
#if HAVE_LIBHYBRIS
const bool hasHwcomposerOption = hasPlugin(KWin::s_hwcomposerPlugin);
#endif
QCommandLineOption xwaylandOption(QStringLiteral("xwayland"),
i18n("Start a rootless Xwayland server."));
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"));
QCommandLineOption framebufferOption(QStringLiteral("framebuffer"),
i18n("Render to framebuffer."));
QCommandLineOption framebufferDeviceOption(QStringLiteral("fb-device"),
i18n("The framebuffer device to render to."),
QStringLiteral("fbdev"));
QCommandLineOption x11DisplayOption(QStringLiteral("x11-display"),
i18n("The X11 Display to use in windowed mode on platform X11."),
QStringLiteral("display"));
QCommandLineOption waylandDisplayOption(QStringLiteral("wayland-display"),
i18n("The Wayland Display to use in windowed mode on platform Wayland."),
QStringLiteral("display"));
QCommandLineOption virtualFbOption(QStringLiteral("virtual"), i18n("Render to a virtual framebuffer."));
QCommandLineOption widthOption(QStringLiteral("width"),
i18n("The width for windowed mode. Default width is 1024."),
QStringLiteral("width"));
widthOption.setDefaultValue(QString::number(1024));
QCommandLineOption heightOption(QStringLiteral("height"),
i18n("The height for windowed mode. Default height is 768."),
QStringLiteral("height"));
heightOption.setDefaultValue(QString::number(768));
QCommandLineOption scaleOption(QStringLiteral("scale"),
i18n("The scale for windowed mode. Default value is 1."),
QStringLiteral("scale"));
scaleOption.setDefaultValue(QString::number(1));
QCommandLineOption outputCountOption(QStringLiteral("output-count"),
i18n("The number of windows to open as outputs in windowed mode. Default value is 1"),
QStringLiteral("count"));
outputCountOption.setDefaultValue(QString::number(1));
QCommandLineParser parser;
a.setupCommandLine(&parser);
parser.addOption(xwaylandOption);
parser.addOption(waylandSocketOption);
if (hasX11Option) {
parser.addOption(x11DisplayOption);
}
if (hasWaylandOption) {
parser.addOption(waylandDisplayOption);
}
if (hasFramebufferOption) {
parser.addOption(framebufferOption);
parser.addOption(framebufferDeviceOption);
}
if (hasVirtualOption) {
parser.addOption(virtualFbOption);
}
if (hasSizeOption) {
parser.addOption(widthOption);
parser.addOption(heightOption);
parser.addOption(scaleOption);
}
if (hasOutputCountOption) {
parser.addOption(outputCountOption);
}
#if HAVE_LIBHYBRIS
QCommandLineOption hwcomposerOption(QStringLiteral("hwcomposer"), i18n("Use libhybris hwcomposer"));
if (hasHwcomposerOption) {
parser.addOption(hwcomposerOption);
}
#endif
QCommandLineOption libinputOption(QStringLiteral("libinput"),
i18n("Enable libinput support for input events processing. Note: never use in a nested session."));
parser.addOption(libinputOption);
#if HAVE_DRM
QCommandLineOption drmOption(QStringLiteral("drm"), i18n("Render through drm node."));
if (hasDrmOption) {
parser.addOption(drmOption);
}
#endif
QCommandLineOption inputMethodOption(QStringLiteral("inputmethod"),
i18n("Input method that KWin starts."),
QStringLiteral("path/to/imserver"));
parser.addOption(inputMethodOption);
QCommandLineOption listBackendsOption(QStringLiteral("list-backends"),
i18n("List all available backends and quit."));
parser.addOption(listBackendsOption);
QCommandLineOption screenLockerOption(QStringLiteral("lockscreen"),
i18n("Starts the session in locked mode."));
parser.addOption(screenLockerOption);
QCommandLineOption noScreenLockerOption(QStringLiteral("no-lockscreen"),
i18n("Starts the session without lock screen support."));
parser.addOption(noScreenLockerOption);
QCommandLineOption noGlobalShortcutsOption(QStringLiteral("no-global-shortcuts"),
i18n("Starts the session without global shortcuts support."));
parser.addOption(noGlobalShortcutsOption);
QCommandLineOption exitWithSessionOption(QStringLiteral("exit-with-session"),
i18n("Exit after the session application, which is started by KWin, closed."),
QStringLiteral("/path/to/session"));
parser.addOption(exitWithSessionOption);
parser.addPositionalArgument(QStringLiteral("applications"),
i18n("Applications to start once Wayland and Xwayland server are started"),
QStringLiteral("[/path/to/application...]"));
parser.process(a);
a.processCommandLine(&parser);
#ifdef KWIN_BUILD_ACTIVITIES
a.setUseKActivities(false);
#endif
if (parser.isSet(listBackendsOption)) {
for (const auto &plugin: availablePlugins) {
std::cout << std::setw(40) << std::left << qPrintable(plugin.name()) << qPrintable(plugin.description()) << std::endl;
}
return 0;
}
if (parser.isSet(exitWithSessionOption)) {
a.setSessionArgument(parser.value(exitWithSessionOption));
}
KWin::Application::setUseLibinput(parser.isSet(libinputOption));
QString pluginName;
QSize initialWindowSize;
QByteArray deviceIdentifier;
int outputCount = 1;
qreal outputScale = 1;
#if HAVE_DRM
if (hasDrmOption && parser.isSet(drmOption)) {
pluginName = KWin::s_drmPlugin;
}
#endif
if (hasSizeOption) {
bool ok = false;
const int width = parser.value(widthOption).toInt(&ok);
if (!ok) {
std::cerr << "FATAL ERROR incorrect value for width" << std::endl;
return 1;
}
const int height = parser.value(heightOption).toInt(&ok);
if (!ok) {
std::cerr << "FATAL ERROR incorrect value for height" << std::endl;
return 1;
}
const qreal scale = parser.value(scaleOption).toDouble(&ok);
if (!ok || scale < 1) {
std::cerr << "FATAL ERROR incorrect value for scale" << std::endl;
return 1;
}
outputScale = scale;
initialWindowSize = QSize(width, height);
}
if (hasOutputCountOption) {
bool ok = false;
const int count = parser.value(outputCountOption).toInt(&ok);
if (ok) {
outputCount = qMax(1, count);
}
}
if (hasX11Option && parser.isSet(x11DisplayOption)) {
deviceIdentifier = parser.value(x11DisplayOption).toUtf8();
pluginName = KWin::s_x11Plugin;
} else if (hasWaylandOption && parser.isSet(waylandDisplayOption)) {
deviceIdentifier = parser.value(waylandDisplayOption).toUtf8();
pluginName = KWin::s_waylandPlugin;
}
if (hasFramebufferOption && parser.isSet(framebufferOption)) {
pluginName = KWin::s_fbdevPlugin;
deviceIdentifier = parser.value(framebufferDeviceOption).toUtf8();
}
#if HAVE_LIBHYBRIS
if (hasHwcomposerOption && parser.isSet(hwcomposerOption)) {
pluginName = KWin::s_hwcomposerPlugin;
}
#endif
if (hasVirtualOption && parser.isSet(virtualFbOption)) {
pluginName = KWin::s_virtualPlugin;
}
if (pluginName.isEmpty()) {
std::cerr << "No backend specified through command line argument, trying auto resolution" << std::endl;
pluginName = KWin::automaticBackendSelection();
}
auto pluginIt = std::find_if(availablePlugins.begin(), availablePlugins.end(),
[&pluginName] (const KPluginMetaData &plugin) {
return plugin.pluginId() == pluginName;
}
);
if (pluginIt == availablePlugins.end()) {
std::cerr << "FATAL ERROR: could not find a backend" << std::endl;
return 1;
}
// TODO: create backend without having the server running
KWin::WaylandServer *server = KWin::WaylandServer::create(&a);
KWin::WaylandServer::InitalizationFlags flags;
if (parser.isSet(screenLockerOption)) {
flags = KWin::WaylandServer::InitalizationFlag::LockScreen;
} else if (parser.isSet(noScreenLockerOption)) {
flags = KWin::WaylandServer::InitalizationFlag::NoLockScreenIntegration;
}
if (parser.isSet(noGlobalShortcutsOption)) {
flags |= KWin::WaylandServer::InitalizationFlag::NoGlobalShortcuts;
}
if (!server->init(parser.value(waylandSocketOption).toUtf8(), flags)) {
std::cerr << "FATAL ERROR: could not create Wayland server" << std::endl;
return 1;
}
a.initPlatform(*pluginIt);
if (!a.platform()) {
std::cerr << "FATAL ERROR: could not instantiate a backend" << std::endl;
return 1;
}
if (!deviceIdentifier.isEmpty()) {
a.platform()->setDeviceIdentifier(deviceIdentifier);
}
if (initialWindowSize.isValid()) {
a.platform()->setInitialWindowSize(initialWindowSize);
}
a.platform()->setInitialOutputScale(outputScale);
a.platform()->setInitialOutputCount(outputCount);
QObject::connect(&a, &KWin::Application::workspaceCreated, server, &KWin::WaylandServer::initWorkspace);
environment.insert(QStringLiteral("WAYLAND_DISPLAY"), server->display()->socketName());
a.setProcessStartupEnvironment(environment);
a.setStartXwayland(parser.isSet(xwaylandOption));
a.setApplicationsToStart(parser.positionalArguments());
a.setInputMethodServerToStart(parser.value(inputMethodOption));
a.start();
return a.exec();
}
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