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kwin/main_x11.cpp
Martin Gräßlin 5acf9abda8 Merge branch 'Plasma/5.5'
2016-02-25 08:07:30 +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 "workspace.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);
if (!wasCrash()) // if this is a crash-restart, DrKonqi may have stopped the process w/o killing the connection
::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 || wasCrash(), true);
createAtoms();
}
bool ApplicationX11::notify(QObject* o, QEvent* e)
{
if (Workspace::self()->workspaceEvent(e))
return true;
return QApplication::notify(o, e);
}
} // 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");
#if (QT_VERSION >= QT_VERSION_CHECK(5, 6, 0))
QCoreApplication::setAttribute(Qt::AA_DisableHighDpiScaling);
#endif
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);
#ifdef KWIN_BUILD_ACTIVITIES
QCommandLineOption noActivitiesOption(QStringLiteral("no-kactivities"),
i18n("Disable KActivities integration."));
parser.addOption(noActivitiesOption);
#endif
parser.process(a);
a.processCommandLine(&parser);
a.setReplace(parser.isSet(replaceOption));
#ifdef KWIN_BUILD_ACTIVITIES
if (parser.isSet(noActivitiesOption)) {
a.setUseKActivities(false);
}
#endif
// 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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