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kwin/main.cpp

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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>
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.h"
//#define QT_CLEAN_NAMESPACE
#include <ksharedconfig.h>
#include <kglobal.h>
#include <klocale.h>
#include <stdlib.h>
#include <kcmdlineargs.h>
#include <kaboutdata.h>
#include <kcrash.h>
#include <signal.h>
#include <fcntl.h>
#include <QX11Info>
#include <stdio.h>
#include <fixx11h.h>
#include <kxerrorhandler.h>
#include <kdefakes.h>
#include <QtDBus/QtDBus>
#include <QMessageBox>
#include <QEvent>
#include <kdialog.h>
#include <kstandarddirs.h>
#include <kdebug.h>
#include <kde_file.h>
#include <QLabel>
#include <KComboBox>
#include <QVBoxLayout>
#include <KGlobalSettings>
#include "config-workspace.h"
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif // HAVE_UNISTD_H
#ifdef HAVE_MALLOC_H
#include <malloc.h>
#endif // HAVE_MALLOC_H
#include <ksmserver_interface.h>
#include "atoms.h"
#include "options.h"
#include "sm.h"
#include "utils.h"
#include "effects.h"
#include "xcbutils.h"
#define INT8 _X11INT8
#define INT32 _X11INT32
#include <X11/Xproto.h>
#undef INT8
#undef INT32
namespace KWin
{
Options* options;
Atoms* atoms;
int screen_number = -1;
bool is_multihead = false;
bool initting = false;
/**
* Whether to run Xlib in synchronous mode and print backtraces for X errors.
* Note that you most probably need to configure cmake with "-D__KDE_HAVE_GCC_VISIBILITY=0"
* and -rdynamic in CXXFLAGS for kBacktrace() to work.
*/
static bool kwin_sync = false;
// errorMessage is only used ifndef NDEBUG, and only in one place.
// it might be worth reevaluating why this is used? I don't know.
#ifndef NDEBUG
/**
* Outputs: "Error: <error> (<value>), Request: <request>(<value>), Resource: <value>"
*/
// This is copied from KXErrorHandler and modified to explicitly use known extensions
static QByteArray errorMessage(const XErrorEvent& event, Display* dpy)
{
QByteArray ret;
char tmp[256];
char num[256];
if (event.request_code < 128) {
// Core request
XGetErrorText(dpy, event.error_code, tmp, 255);
// The explanation in parentheses just makes
// it more verbose and is not really useful
if (char* paren = strchr(tmp, '('))
* paren = '\0';
// The various casts are to get overloads non-ambiguous :-/
ret = QByteArray("error: ") + (const char*)(tmp) + '[' + QByteArray::number(event.error_code) + ']';
sprintf(num, "%d", event.request_code);
XGetErrorDatabaseText(dpy, "XRequest", num, "<unknown>", tmp, 256);
ret += QByteArray(", request: ") + (const char*)(tmp) + '[' + QByteArray::number(event.request_code) + ']';
if (event.resourceid != 0)
ret += QByteArray(", resource: 0x") + QByteArray::number(qlonglong(event.resourceid), 16);
} else { // Extensions
// XGetErrorText() currently has a bug that makes it fail to find text
// for some errors (when error==error_base), also XGetErrorDatabaseText()
// requires the right extension name, so it is needed to get info about
// all extensions. However that is almost impossible:
// - Xlib itself has it, but in internal data.
// - Opening another X connection now can cause deadlock with server grabs.
// - Fetching it at startup means a bunch of roundtrips.
// KWin here explicitly uses known extensions.
XGetErrorText(dpy, event.error_code, tmp, 255);
int index = -1;
int base = 0;
QVector<Xcb::ExtensionData> extensions = Xcb::Extensions::self()->extensions();
for (int i = 0; i < extensions.size(); ++i) {
const Xcb::ExtensionData &extension = extensions.at(i);
if (extension.errorBase != 0 &&
event.error_code >= extension.errorBase && (index == -1 || extension.errorBase > base)) {
index = i;
base = extension.errorBase;
}
}
if (tmp == QString::number(event.error_code)) {
// XGetErrorText() failed or it has a bug that causes not finding all errors, check ourselves
if (index != -1) {
snprintf(num, 255, "%s.%d", extensions.at(index).name.constData(), event.error_code - base);
XGetErrorDatabaseText(dpy, "XProtoError", num, "<unknown>", tmp, 255);
} else
strcpy(tmp, "<unknown>");
}
if (char* paren = strchr(tmp, '('))
* paren = '\0';
if (index != -1)
ret = QByteArray("error: ") + (const char*)(tmp) + '[' + extensions.at(index).name +
'+' + QByteArray::number(event.error_code - base) + ']';
else
ret = QByteArray("error: ") + (const char*)(tmp) + '[' + QByteArray::number(event.error_code) + ']';
tmp[0] = '\0';
for (int i = 0; i < extensions.size(); ++i)
if (extensions.at(i).majorOpcode == event.request_code) {
snprintf(num, 255, "%s.%d", extensions.at(i).name.constData(), event.minor_code);
XGetErrorDatabaseText(dpy, "XRequest", num, "<unknown>", tmp, 255);
ret += QByteArray(", request: ") + (const char*)(tmp) + '[' +
extensions.at(i).name + '+' + QByteArray::number(event.minor_code) + ']';
}
if (tmp[0] == '\0') // Not found?
ret += QByteArray(", request <unknown> [") + QByteArray::number(event.request_code) + ':'
+ QByteArray::number(event.minor_code) + ']';
if (event.resourceid != 0)
ret += QByteArray(", resource: 0x") + QByteArray::number(qlonglong(event.resourceid), 16);
}
return ret;
}
#endif
static int x11ErrorHandler(Display* d, XErrorEvent* e)
{
Q_UNUSED(d);
bool ignore_badwindow = true; // Might be temporary
if (initting && (e->request_code == X_ChangeWindowAttributes || e->request_code == X_GrabKey) &&
e->error_code == BadAccess) {
fputs(i18n("kwin: it looks like there's already a window manager running. kwin not started.\n").toLocal8Bit(), stderr);
exit(1);
}
if (ignore_badwindow && (e->error_code == BadWindow || e->error_code == BadColor))
return 0;
#ifndef NDEBUG
//fprintf( stderr, "kwin: X Error (%s)\n", KXErrorHandler::errorMessage( *e, d ).data());
kWarning(1212) << "kwin: X Error (" << errorMessage(*e, d) << ")";
#endif
if (kwin_sync)
fprintf(stderr, "%s\n", kBacktrace().toLocal8Bit().data());
return 0;
}
class AlternativeWMDialog : public KDialog
{
public:
AlternativeWMDialog()
: KDialog() {
setButtons(KDialog::Ok | KDialog::Cancel);
QWidget* mainWidget = new QWidget(this);
QVBoxLayout* layout = new QVBoxLayout(mainWidget);
QString text = i18n(
"KWin is unstable.\n"
"It seems to have crashed several times in a row.\n"
"You can select another window manager to run:");
QLabel* textLabel = new QLabel(text, mainWidget);
layout->addWidget(textLabel);
wmList = new KComboBox(mainWidget);
wmList->setEditable(true);
layout->addWidget(wmList);
addWM("metacity");
addWM("openbox");
addWM("fvwm2");
addWM(KWIN_NAME);
setMainWidget(mainWidget);
raise();
centerOnScreen(this);
}
void addWM(const QString& wm) {
// TODO: Check if WM is installed
if (!KStandardDirs::findExe(wm).isEmpty())
wmList->addItem(wm);
}
QString selectedWM() const {
return wmList->currentText();
}
private:
KComboBox* wmList;
};
int Application::crashes = 0;
Application::Application()
: KApplication()
, owner(screen_number)
{
if (KCmdLineArgs::parsedArgs("qt")->isSet("sync")) {
kwin_sync = true;
XSynchronize(display(), True);
kDebug(1212) << "Running KWin in sync mode";
}
setQuitOnLastWindowClosed(false);
KCmdLineArgs* args = KCmdLineArgs::parsedArgs();
KSharedConfig::Ptr config = KGlobal::config();
if (!config->isImmutable() && args->isSet("lock")) {
// TODO: This shouldn't be necessary
//config->setReadOnly( true );
config->reparseConfiguration();
}
if (screen_number == -1)
screen_number = DefaultScreen(display());
if (!owner.claim(args->isSet("replace"), true)) {
fputs(i18n("kwin: unable to claim manager selection, another wm running? (try using --replace)\n").toLocal8Bit(), stderr);
::exit(1);
}
connect(&owner, SIGNAL(lostOwnership()), SLOT(lostSelection()));
KCrash::setEmergencySaveFunction(Application::crashHandler);
crashes = args->getOption("crashes").toInt();
if (crashes >= 4) {
// Something has gone seriously wrong
AlternativeWMDialog dialog;
QString cmd = KWIN_NAME;
if (dialog.exec() == QDialog::Accepted)
cmd = dialog.selectedWM();
else
::exit(1);
if (cmd.length() > 500) {
kDebug(1212) << "Command is too long, truncating";
cmd = cmd.left(500);
}
kDebug(1212) << "Starting" << cmd << "and exiting";
char buf[1024];
sprintf(buf, "%s &", cmd.toAscii().data());
system(buf);
::exit(1);
}
if (crashes >= 2) {
// Disable compositing if we have had too many crashes
kDebug(1212) << "Too many crashes recently, disabling compositing";
KConfigGroup compgroup(config, "Compositing");
compgroup.writeEntry("Enabled", false);
}
// Reset crashes count if we stay up for more that 15 seconds
QTimer::singleShot(15 * 1000, this, SLOT(resetCrashesCount()));
initting = true; // Startup...
// first load options - done internally by a different thread
options = new Options;
// Install X11 error handler
XSetErrorHandler(x11ErrorHandler);
// Check whether another windowmanager is running
XSelectInput(display(), rootWindow(), SubstructureRedirectMask);
syncX(); // Trigger error now
atoms = new Atoms;
// initting = false; // TODO
// This tries to detect compositing options and can use GLX. GLX problems
// (X errors) shouldn't cause kwin to abort, so this is out of the
// critical startup section where x errors cause kwin to abort.
// create workspace.
(void) new Workspace(isSessionRestored());
syncX(); // Trigger possible errors, there's still a chance to abort
initting = false; // Startup done, we are up and running now.
XEvent e;
e.xclient.type = ClientMessage;
e.xclient.message_type = XInternAtom(display(), "_KDE_SPLASH_PROGRESS", False);
e.xclient.display = display();
e.xclient.window = rootWindow();
e.xclient.format = 8;
strcpy(e.xclient.data.b, "wm");
XSendEvent(display(), rootWindow(), False, SubstructureNotifyMask, &e);
}
Application::~Application()
{
delete Workspace::self();
if (owner.ownerWindow() != None) // If there was no --replace (no new WM)
XSetInputFocus(display(), PointerRoot, RevertToPointerRoot, xTime());
delete options;
delete effects;
delete atoms;
}
void Application::lostSelection()
{
sendPostedEvents();
delete Workspace::self();
// Remove windowmanager privileges
XSelectInput(display(), rootWindow(), PropertyChangeMask);
quit();
}
bool Application::x11EventFilter(XEvent* e)
{
if (Workspace::self() && Workspace::self()->workspaceEvent(e))
return true;
return KApplication::x11EventFilter(e);
}
bool Application::notify(QObject* o, QEvent* e)
{
if (Workspace::self()->workspaceEvent(e))
return true;
return KApplication::notify(o, e);
}
static void sighandler(int)
{
QApplication::exit();
}
void Application::crashHandler(int signal)
{
crashes++;
fprintf(stderr, "Application::crashHandler() called with signal %d; recent crashes: %d\n", signal, crashes);
char cmd[1024];
sprintf(cmd, "%s --crashes %d &",
QFile::encodeName(QCoreApplication::applicationFilePath()).constData(), crashes);
sleep(1);
system(cmd);
}
void Application::resetCrashesCount()
{
crashes = 0;
}
} // namespace
static const char version[] = KDE_VERSION_STRING;
static const char description[] = I18N_NOOP("KDE window manager");
extern "C"
KDE_EXPORT int kdemain(int argc, char * argv[])
{
#ifdef M_TRIM_THRESHOLD
// Prevent fragmentation of the heap by malloc (glibc).
//
// The default threshold is 128*1024, which can result in a large memory usage
// due to fragmentation especially if we use the raster graphicssystem. On the
// otherside if the threshold is too low, free() starts to permanently ask the kernel
// about shrinking the heap.
#ifdef HAVE_UNISTD_H
const int pagesize = sysconf(_SC_PAGESIZE);
#else
const int pagesize = 4*1024;
#endif // HAVE_UNISTD_H
mallopt(M_TRIM_THRESHOLD, 5*pagesize);
#endif // M_TRIM_THRESHOLD
// the raster graphicssystem has a quite terrible performance on the XRender backend or when not
// compositing at all while some to many decorations suffer from bad performance of the native
// graphicssystem (lack of implementation, QGradient internally uses the raster system and
// XPutImage's the result because some graphics drivers have insufficient or bad performing
// implementations of XRenderCreate*Gradient)
//
// Therefore we allow configurationa and do some automagic selection to discourage
// ""known to be stupid" ideas ;-P
// The invalid system parameter "" will use the systems default graphicssystem
// "!= XRender" is intended since eg. pot. SW backends likely would profit from raster as well
KConfigGroup config(KSharedConfig::openConfig(KWIN_CONFIG), "Compositing");
QString preferredSystem("native");
if (config.readEntry("Enabled", true) && config.readEntry("Backend", "OpenGL") != "XRender")
preferredSystem = "";
QApplication::setGraphicsSystem(config.readEntry("GraphicsSystem", preferredSystem));
Display* dpy = XOpenDisplay(NULL);
if (!dpy) {
fprintf(stderr, "%s: FATAL ERROR while trying to open display %s\n",
argv[0], XDisplayName(NULL));
exit(1);
}
int number_of_screens = ScreenCount(dpy);
// multi head
if (number_of_screens != 1 && KGlobalSettings::isMultiHead()) {
KWin::is_multihead = true;
KWin::screen_number = DefaultScreen(dpy);
int pos; // Temporarily needed to reconstruct DISPLAY var if multi-head
QByteArray display_name = XDisplayString(dpy);
XCloseDisplay(dpy);
dpy = 0;
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::screen_number && fork() == 0) {
KWin::screen_number = i;
// 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::screen_number);
if (putenv(strdup(envir.toAscii()))) {
fprintf(stderr, "%s: WARNING: unable to set DISPLAY environment variable\n", argv[0]);
perror("putenv()");
}
}
KAboutData aboutData(
KWIN_NAME, // The program name used internally
0, // The message catalog name. If null, program name is used instead
ki18n("KWin"), // A displayable program name string
version, // The program version string
ki18n(description), // Short description of what the app does
KAboutData::License_GPL, // The license this code is released under
ki18n("(c) 1999-2008, The KDE Developers")); // Copyright Statement
aboutData.addAuthor(ki18n("Matthias Ettrich"), KLocalizedString(), "ettrich@kde.org");
aboutData.addAuthor(ki18n("Cristian Tibirna"), KLocalizedString(), "tibirna@kde.org");
aboutData.addAuthor(ki18n("Daniel M. Duley"), KLocalizedString(), "mosfet@kde.org");
aboutData.addAuthor(ki18n("Luboš Luňák"), KLocalizedString(), "l.lunak@kde.org");
aboutData.addAuthor(ki18n("Martin Gräßlin"), ki18n("Maintainer"), "kde@martin-graesslin.com");
KCmdLineArgs::init(argc, argv, &aboutData);
KCmdLineOptions args;
args.add("lock", ki18n("Disable configuration options"));
args.add("replace", ki18n("Replace already-running ICCCM2.0-compliant window manager"));
args.add("crashes <n>", ki18n("Indicate that KWin has recently crashed n times"));
KCmdLineArgs::addCmdLineOptions(args);
if (KDE_signal(SIGTERM, KWin::sighandler) == SIG_IGN)
KDE_signal(SIGTERM, SIG_IGN);
if (KDE_signal(SIGINT, KWin::sighandler) == SIG_IGN)
KDE_signal(SIGINT, SIG_IGN);
if (KDE_signal(SIGHUP, KWin::sighandler) == SIG_IGN)
KDE_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);
org::kde::KSMServerInterface ksmserver("org.kde.ksmserver", "/KSMServer", QDBusConnection::sessionBus());
ksmserver.suspendStartup(KWIN_NAME);
KWin::Application a;
ksmserver.resumeStartup(KWIN_NAME);
KWin::SessionManager weAreIndeed;
KWin::SessionSaveDoneHelper helper;
KGlobal::locale()->insertCatalog("kwin_effects");
// Announce when KWIN_DIRECT_GL is set for above HACK
if (qstrcmp(qgetenv("KWIN_DIRECT_GL"), "1") == 0)
kDebug(1212) << "KWIN_DIRECT_GL set, not forcing LIBGL_ALWAYS_INDIRECT=1";
fcntl(XConnectionNumber(KWin::display()), F_SETFD, 1);
QString appname;
if (KWin::screen_number == 0)
appname = "org.kde.kwin";
else
appname.sprintf("org.kde.kwin-screen-%d", KWin::screen_number);
QDBusConnection::sessionBus().interface()->registerService(
appname, QDBusConnectionInterface::DontQueueService);
KCmdLineArgs* sargs = KCmdLineArgs::parsedArgs();
return a.exec();
}
#include "main.moc"
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