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 <unistd.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 <kdialog.h>
#include <kstandarddirs.h>
#include <kdebug.h>
#include <QLabel>
#include <QComboBox>
#include <QVBoxLayout>
#include "atoms.h"
#include "options.h"
#include "sm.h"
#include "utils.h"
#include "effects.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 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;
/**
* 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.
int nextensions;
const char** extensions;
int* majors;
int* error_bases;
Extensions::fillExtensionsData( extensions, nextensions, majors, error_bases );
XGetErrorText( dpy, event.error_code, tmp, 255 );
int index = -1;
int base = 0;
for( int i = 0; i < nextensions; ++i )
if( error_bases[i] != 0 &&
event.error_code >= error_bases[i] && ( index == -1 || error_bases[i] > base ))
{
index = i;
base = error_bases[i];
}
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[index], 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 ) + '[' + (const char*)( extensions[index] ) +
'+' + 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 < nextensions; ++i )
if( majors[i] == event.request_code )
{
snprintf( num, 255, "%s.%d", extensions[i], event.minor_code );
XGetErrorDatabaseText( dpy, "XRequest", num, "<unknown>", tmp, 255 );
ret += QByteArray( ", request: " ) + (const char*)( tmp ) + '[' +
(const char*)( extensions[i] ) + '+' + 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;
}
static int x11ErrorHandler( Display* d, XErrorEvent* e )
{
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 QComboBox( mainWidget );
wmList->setEditable( true );
layout->addWidget( wmList );
addWM( "metacity" );
addWM( "openbox" );
addWM( "fvwm2" );
addWM( "kwin" );
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:
QComboBox* 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" ))
{
#ifdef __GNUC__
#warning this shouldn not be necessary
#endif
//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";
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() ));
// If KWin was already running it saved its configuration after loosing the selection -> Reread
config->reparseConfiguration();
initting = true; // Startup...
// 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.
options = new Options;
// 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[] )
{
bool restored = false;
for( int arg = 1; arg < argc; arg++ )
{
if( !qstrcmp( argv[arg], "-session" ))
{
restored = true;
break;
}
}
// KWin only works properly with Qt's native X11 backend; override any compile-time
// or command line settings to raster or OpenGL.
QApplication::setGraphicsSystem("native");
if( !restored )
{ // We only do the multihead fork if we are not restored by the session
// manager, since the session manager will register multiple kwins,
// one for each screen...
QByteArray multiHead = getenv( "KDE_MULTIHEAD" );
if( multiHead.toLower() == "true" )
{
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 );
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;
if( number_of_screens != 1 )
{
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", // 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" ), ki18n( "Maintainer" ), "l.lunak@kde.org" );
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( 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 );
// HACK: This is needed for AIGLX
if( qstrcmp( getenv( "KWIN_DIRECT_GL" ), "1" ) != 0 )
setenv( "LIBGL_ALWAYS_INDIRECT","1", true );
// HACK: this is needed to work around a Qt4.4.0RC1 bug (#157659)
setenv( "QT_SLOW_TOPLEVEL_RESIZE", "1", true );
KWin::Application a;
KWin::SessionManager weAreIndeed;
KWin::SessionSaveDoneHelper helper;
KGlobal::locale()->insertCatalog( "kwin_effects" );
// Announce when KWIN_DIRECT_GL is set for above HACK
if( qstrcmp( getenv( "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 );
return a.exec();
}
#include "main.moc"