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kwin/main_x11.cpp
Martin Gräßlin 1998d5ac1a [wayland] Improve tear-down to not crash if X11 applications are still around 
We need to destroy the compositor after Xwayland terminated and after
the internal Wayland connection is destroyed. This means when destroying
the Workspace we may no longer destroy the Compositor at the same time.
Also we need to ensure that other tear down functionality doesn't call
into the no longer existing internal client connection.

With this change kwin doesn't crash when exiting with Wayland and/or
X11 windows still open.
2015-11-10 08:56:32 +01:00

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/********************************************************************
KWin - the KDE window manager
This file is part of the KDE project.
Copyright (C) 1999, 2000 Matthias Ettrich <ettrich@kde.org>
Copyright (C) 2003 Lubos Lunak <l.lunak@kde.org>
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_x11.h"
#include <config-kwin.h>
// kwin
#include "sm.h"
#include "xcbutils.h"
// KDE
#include <KLocalizedString>
// Qt
#include <qplatformdefs.h>
#include <QCommandLineParser>
// system
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif // HAVE_UNISTD_H
namespace KWin
{
static void sighandler(int)
{
QApplication::exit();
}
//************************************
// KWinSelectionOwner
//************************************
KWinSelectionOwner::KWinSelectionOwner(int screen_P)
: KSelectionOwner(make_selection_atom(screen_P), screen_P)
{
}
xcb_atom_t KWinSelectionOwner::make_selection_atom(int screen_P)
{
if (screen_P < 0)
screen_P = QX11Info::appScreen();
QByteArray screen(QByteArrayLiteral("WM_S"));
screen.append(QByteArray::number(screen_P));
ScopedCPointer<xcb_intern_atom_reply_t> atom(xcb_intern_atom_reply(
connection(),
xcb_intern_atom_unchecked(connection(), false, screen.length(), screen.constData()),
nullptr));
if (atom.isNull()) {
return XCB_ATOM_NONE;
}
return atom->atom;
}
void KWinSelectionOwner::getAtoms()
{
KSelectionOwner::getAtoms();
if (xa_version == XCB_ATOM_NONE) {
const QByteArray name(QByteArrayLiteral("VERSION"));
ScopedCPointer<xcb_intern_atom_reply_t> atom(xcb_intern_atom_reply(
connection(),
xcb_intern_atom_unchecked(connection(), false, name.length(), name.constData()),
nullptr));
if (!atom.isNull()) {
xa_version = atom->atom;
}
}
}
void KWinSelectionOwner::replyTargets(xcb_atom_t property_P, xcb_window_t requestor_P)
{
KSelectionOwner::replyTargets(property_P, requestor_P);
xcb_atom_t atoms[ 1 ] = { xa_version };
// PropModeAppend !
xcb_change_property(connection(), XCB_PROP_MODE_APPEND, requestor_P,
property_P, XCB_ATOM_ATOM, 32, 1, atoms);
}
bool KWinSelectionOwner::genericReply(xcb_atom_t target_P, xcb_atom_t property_P, xcb_window_t requestor_P)
{
if (target_P == xa_version) {
int32_t version[] = { 2, 0 };
xcb_change_property(connection(), XCB_PROP_MODE_REPLACE, requestor_P,
property_P, XCB_ATOM_INTEGER, 32, 2, version);
} else
return KSelectionOwner::genericReply(target_P, property_P, requestor_P);
return true;
}
xcb_atom_t KWinSelectionOwner::xa_version = XCB_ATOM_NONE;
//************************************
// ApplicationX11
//************************************
ApplicationX11::ApplicationX11(int &argc, char **argv)
: Application(OperationModeX11, argc, argv)
, owner()
, m_replace(false)
{
setX11Connection(QX11Info::connection());
setX11RootWindow(QX11Info::appRootWindow());
}
ApplicationX11::~ApplicationX11()
{
destroyCompositor();
destroyWorkspace();
if (!owner.isNull() && owner->ownerWindow() != XCB_WINDOW_NONE) // If there was no --replace (no new WM)
Xcb::setInputFocus(XCB_INPUT_FOCUS_POINTER_ROOT);
}
void ApplicationX11::setReplace(bool replace)
{
m_replace = replace;
}
void ApplicationX11::lostSelection()
{
sendPostedEvents();
destroyCompositor();
destroyWorkspace();
// Remove windowmanager privileges
Xcb::selectInput(rootWindow(), XCB_EVENT_MASK_PROPERTY_CHANGE);
quit();
}
void ApplicationX11::performStartup()
{
if (Application::x11ScreenNumber() == -1) {
Application::setX11ScreenNumber(QX11Info::appScreen());
}
// QSessionManager for some reason triggers a very early commitDataRequest
// and updates the key - before we create the workspace and load the session
// data -> store and pass to the workspace constructor
m_originalSessionKey = sessionKey();
owner.reset(new KWinSelectionOwner(Application::x11ScreenNumber()));
connect(owner.data(), &KSelectionOwner::failedToClaimOwnership, []{
fputs(i18n("kwin: unable to claim manager selection, another wm running? (try using --replace)\n").toLocal8Bit().constData(), stderr);
::exit(1);
});
connect(owner.data(), SIGNAL(lostOwnership()), SLOT(lostSelection()));
connect(owner.data(), &KSelectionOwner::claimedOwnership, [this]{
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: another window manager is running (try using --replace)\n").toLocal8Bit().constData(), stderr);
::exit(1);
}
createInput();
createWorkspace();
Xcb::sync(); // Trigger possible errors, there's still a chance to abort
notifyKSplash();
});
// we need to do an XSync here, otherwise the QPA might crash us later on
Xcb::sync();
owner->claim(m_replace, true);
createAtoms();
}
} // namespace
extern "C"
KWIN_EXPORT int kdemain(int argc, char * argv[])
{
KWin::Application::setupMalloc();
KWin::Application::setupLocalizedString();
int primaryScreen = 0;
xcb_connection_t *c = xcb_connect(nullptr, &primaryScreen);
if (!c || xcb_connection_has_error(c)) {
fprintf(stderr, "%s: FATAL ERROR while trying to open display %s\n",
argv[0], qgetenv("DISPLAY").constData());
exit(1);
}
const int number_of_screens = xcb_setup_roots_length(xcb_get_setup(c));
xcb_disconnect(c);
c = nullptr;
// multi head
auto isMultiHead = []() -> bool {
QByteArray multiHead = qgetenv("KDE_MULTIHEAD");
if (!multiHead.isEmpty()) {
return (multiHead.toLower() == "true");
}
return true;
};
if (number_of_screens != 1 && isMultiHead()) {
KWin::Application::setX11MultiHead(true);
KWin::Application::setX11ScreenNumber(primaryScreen);
int pos; // Temporarily needed to reconstruct DISPLAY var if multi-head
QByteArray display_name = qgetenv("DISPLAY");
if ((pos = display_name.lastIndexOf('.')) != -1)
display_name.remove(pos, 10); // 10 is enough to be sure we removed ".s"
QString envir;
for (int i = 0; i < number_of_screens; i++) {
// If execution doesn't pass by here, then kwin
// acts exactly as previously
if (i != KWin::Application::x11ScreenNumber() && fork() == 0) {
KWin::Application::setX11ScreenNumber(i);
QByteArray dBusSuffix = qgetenv("KWIN_DBUS_SERVICE_SUFFIX");
if (!dBusSuffix.isNull()) {
dBusSuffix.append(".");
}
dBusSuffix.append(QByteArrayLiteral("head-")).append(QByteArray::number(i));
qputenv("KWIN_DBUS_SERVICE_SUFFIX", dBusSuffix);
// Break here because we are the child process, we don't
// want to fork() anymore
break;
}
}
// In the next statement, display_name shouldn't contain a screen
// number. If it had it, it was removed at the "pos" check
envir.sprintf("DISPLAY=%s.%d", display_name.data(), KWin::Application::x11ScreenNumber());
if (putenv(strdup(envir.toAscii().constData()))) {
fprintf(stderr, "%s: WARNING: unable to set DISPLAY environment variable\n", argv[0]);
perror("putenv()");
}
}
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);
// 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
setenv("QT_QPA_PLATFORM", "xcb", true);
qunsetenv("QT_DEVICE_PIXEL_RATIO");
KWin::ApplicationX11 a(argc, argv);
a.setupTranslator();
KWin::Application::createAboutData();
QCommandLineOption replaceOption(QStringLiteral("replace"), i18n("Replace already-running ICCCM2.0-compliant window manager"));
QCommandLineParser parser;
a.setupCommandLine(&parser);
parser.addOption(replaceOption);
parser.process(a);
a.processCommandLine(&parser);
a.setReplace(parser.isSet(replaceOption));
// perform sanity checks
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();
KWin::SessionSaveDoneHelper helper;
Q_UNUSED(helper); // The sessionsavedonehelper opens a side channel to the smserver,
// listens for events and talks to it, so it needs to be created.
return a.exec();
}
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