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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 <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;
static 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;
// this is copied from KXErrorHandler and modified to explicitly use known extensions
static QByteArray errorMessage( const XErrorEvent& event, Display* dpy )
{ // "Error: <error> (<value>), Request: <request>(<value>), Resource: <value>"
QByteArray ret;
char tmp[ 256 ];
char num[ 256 ];
if( event.request_code < 128 ) // core request
{
XGetErrorText( dpy, event.error_code, tmp, 255 );
if( char* paren = strchr( tmp, '(' )) // the explanation in parentheses just makes
*paren = '\0'; // it more verbose and is not really useful
// 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; //maybe 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;
// fprintf( stderr, "kwin: X Error (%s)\n", KXErrorHandler::errorMessage( *e, d ).data());
fprintf( stderr, "kwin: X Error (%s)\n", errorMessage( *e, d ).data());
if( kwin_sync )
fprintf( stderr, "%s\n", kBacktrace().toLocal8Bit().data());
if (initting)
{
fputs(i18n("kwin: failure during initialization; aborting").toLocal8Bit(), stderr);
exit(1);
}
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() << "Running KWin in sync mode";
}
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() << "Command is too long, truncating";
cmd = cmd.left(500);
}
kDebug() << "Starting" << cmd << "and exiting";
char buf[1024];
sprintf(buf, "%s &", cmd.toAscii().data());
system(buf);
::exit(1);
}
// Disable compositing if we have had too many crashes
if( crashes >= 2 )
{
kDebug() << "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 there was already kwin 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, "kwin --crashes %d &", 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;
}
}
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", 0, ki18n("KWin"),
version, ki18n(description), KAboutData::License_GPL,
ki18n("(c) 1999-2005, The KDE Developers"));
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
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" );
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"
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