Copy the KDE 3.5 branch to branches/trinity for new KDE 3.5 features.

BUG:215923


git-svn-id: svn://anonsvn.kde.org/home/kde/branches/trinity/kdebase@1054174 283d02a7-25f6-0310-bc7c-ecb5cbfe19da

1 files changed, 1172 insertions, 0 deletions

diff --git a/kdesktop/lock/lockprocess.cc b/kdesktop/lock/lockprocess.cc
new file mode 100644
index 000000000..a813b6899
--- /dev/null
+++ b/kdesktop/lock/lockprocess.cc
@@ -0,0 +1,1172 @@
+//===========================================================================
+//
+// This file is part of the KDE project
+//
+// Copyright (c) 1999 Martin R. Jones <mjones@kde.org>
+// Copyright (c) 2003 Oswald Buddenhagen <ossi@kde.org>
+//
+
+//kdesktop keeps running and checks user inactivity
+//when it should show screensaver (and maybe lock the session),
+//it starts kdesktop_lock, who does all the locking and who
+//actually starts the screensaver
+
+//It's done this way to prevent screen unlocking when kdesktop
+//crashes (e.g. because it's set to multiple wallpapers and
+//some image will be corrupted).
+
+#include <config.h>
+
+#include "lockprocess.h"
+#include "lockdlg.h"
+#include "autologout.h"
+#include "kdesktopsettings.h"
+
+#include <dmctl.h>
+
+#include <kstandarddirs.h>
+#include <kapplication.h>
+#include <kservicegroup.h>
+#include <kdebug.h>
+#include <kmessagebox.h>
+#include <kglobalsettings.h>
+#include <klocale.h>
+#include <klibloader.h>
+#include <kpushbutton.h>
+#include <kstdguiitem.h>
+#include <kpixmapeffect.h>
+#include <kpixmap.h>
+
+#include <qframe.h>
+#include <qlabel.h>
+#include <qlayout.h>
+#include <qcursor.h>
+#include <qtimer.h>
+#include <qfile.h>
+#include <qsocketnotifier.h>
+#include <qvaluevector.h>
+#include <qtooltip.h>
+
+#include <qdatetime.h>
+
+#include <stdlib.h>
+#include <assert.h>
+#include <signal.h>
+#ifdef HAVE_SETPRIORITY
+#include <sys/time.h>
+#include <sys/resource.h>
+#endif
+
+#include <X11/Xlib.h>
+#include <X11/Xutil.h>
+#include <X11/keysym.h>
+#include <X11/Xatom.h>
+#include <X11/Intrinsic.h>
+
+#ifdef HAVE_DPMS
+extern "C" {
+#include <X11/Xmd.h>
+#ifndef Bool
+#define Bool BOOL
+#endif
+#include <X11/extensions/dpms.h>
+
+#ifndef HAVE_DPMSINFO_PROTO
+Status DPMSInfo ( Display *, CARD16 *, BOOL * );
+#endif
+}
+#endif
+
+#ifdef HAVE_XF86MISC
+#include <X11/extensions/xf86misc.h>
+#endif
+
+#ifdef HAVE_GLXCHOOSEVISUAL
+#include <GL/glx.h>
+#endif
+
+#define LOCK_GRACE_DEFAULT          5000
+#define AUTOLOGOUT_DEFAULT          600
+
+static Window gVRoot = 0;
+static Window gVRootData = 0;
+static Atom   gXA_VROOT;
+static Atom   gXA_SCREENSAVER_VERSION;
+
+//===========================================================================
+//
+// Screen saver handling process.  Handles screensaver window,
+// starting screensaver hacks, and password entry.f
+//
+LockProcess::LockProcess(bool child, bool useBlankOnly)
+    : QWidget(0L, "saver window", WX11BypassWM),
+      mOpenGLVisual(0),
+      child_saver(child),
+      mParent(0),
+      mUseBlankOnly(useBlankOnly),
+      mSuspended(false),
+      mVisibility(false),
+      mRestoreXF86Lock(false),
+      mForbidden(false),
+      mAutoLogout(false)
+{
+    setupSignals();
+
+    kapp->installX11EventFilter(this);
+
+    // Get root window size
+    XWindowAttributes rootAttr;
+    XGetWindowAttributes(qt_xdisplay(), RootWindow(qt_xdisplay(),
+                        qt_xscreen()), &rootAttr);
+    mRootWidth = rootAttr.width;
+    mRootHeight = rootAttr.height;
+    { // trigger creation of QToolTipManager, it does XSelectInput() on the root window
+    QWidget w;
+    QToolTip::add( &w, "foo" );
+    }
+    XSelectInput( qt_xdisplay(), qt_xrootwin(),
+        SubstructureNotifyMask | rootAttr.your_event_mask );
+
+    // Add non-KDE path
+    KGlobal::dirs()->addResourceType("scrsav",
+                                    KGlobal::dirs()->kde_default("apps") +
+                                    "System/ScreenSavers/");
+
+    // Add KDE specific screensaver path
+    QString relPath="System/ScreenSavers/";
+    KServiceGroup::Ptr servGroup = KServiceGroup::baseGroup( "screensavers");
+    if (servGroup)
+    {
+      relPath=servGroup->relPath();
+      kdDebug(1204) << "relPath=" << relPath << endl;
+    }
+    KGlobal::dirs()->addResourceType("scrsav",
+                                     KGlobal::dirs()->kde_default("apps") +
+                                     relPath);
+
+    // virtual root property
+    gXA_VROOT = XInternAtom (qt_xdisplay(), "__SWM_VROOT", False);
+    gXA_SCREENSAVER_VERSION = XInternAtom (qt_xdisplay(), "_SCREENSAVER_VERSION", False);
+
+    connect(&mHackProc, SIGNAL(processExited(KProcess *)),
+                        SLOT(hackExited(KProcess *)));
+
+    connect(&mSuspendTimer, SIGNAL(timeout()), SLOT(suspend()));
+
+    QStringList dmopt =
+        QStringList::split(QChar(','),
+                            QString::fromLatin1( ::getenv( "XDM_MANAGED" )));
+    for (QStringList::ConstIterator it = dmopt.begin(); it != dmopt.end(); ++it)
+        if ((*it).startsWith("method="))
+            mMethod = (*it).mid(7);
+
+    configure();
+
+#ifdef HAVE_DPMS
+    if (mDPMSDepend) {
+        BOOL on;
+        CARD16 state;
+        DPMSInfo(qt_xdisplay(), &state, &on);
+        if (on)
+        {
+            connect(&mCheckDPMS, SIGNAL(timeout()), SLOT(checkDPMSActive()));
+            // we can save CPU if we stop it as quickly as possible
+            // but we waste CPU if we check too often -> so take 10s
+            mCheckDPMS.start(10000);
+        }
+    }
+#endif
+
+    greetPlugin.library = 0;
+}
+
+//---------------------------------------------------------------------------
+//
+// Destructor - usual cleanups.
+//
+LockProcess::~LockProcess()
+{
+    if (greetPlugin.library) {
+        if (greetPlugin.info->done)
+            greetPlugin.info->done();
+        greetPlugin.library->unload();
+    }
+}
+
+static int signal_pipe[2];
+
+static void sigterm_handler(int)
+{
+    char tmp = 'T';
+    ::write( signal_pipe[1], &tmp, 1);
+}
+
+static void sighup_handler(int)
+{
+    char tmp = 'H';
+    ::write( signal_pipe[1], &tmp, 1);
+}
+
+void LockProcess::timerEvent(QTimerEvent *ev)
+{
+	if (mAutoLogout && ev->timerId() == mAutoLogoutTimerId)
+	{
+		killTimer(mAutoLogoutTimerId);
+		AutoLogout autologout(this);
+		execDialog(&autologout);
+	}
+}
+
+void LockProcess::setupSignals()
+{
+    struct sigaction act;
+    // ignore SIGINT
+    act.sa_handler=SIG_IGN;
+    sigemptyset(&(act.sa_mask));
+    sigaddset(&(act.sa_mask), SIGINT);
+    act.sa_flags = 0;
+    sigaction(SIGINT, &act, 0L);
+    // ignore SIGQUIT
+    act.sa_handler=SIG_IGN;
+    sigemptyset(&(act.sa_mask));
+    sigaddset(&(act.sa_mask), SIGQUIT);
+    act.sa_flags = 0;
+    sigaction(SIGQUIT, &act, 0L);
+    // exit cleanly on SIGTERM
+    act.sa_handler= sigterm_handler;
+    sigemptyset(&(act.sa_mask));
+    sigaddset(&(act.sa_mask), SIGTERM);
+    act.sa_flags = 0;
+    sigaction(SIGTERM, &act, 0L);
+    // SIGHUP forces lock
+    act.sa_handler= sighup_handler;
+    sigemptyset(&(act.sa_mask));
+    sigaddset(&(act.sa_mask), SIGHUP);
+    act.sa_flags = 0;
+    sigaction(SIGHUP, &act, 0L);
+
+    pipe(signal_pipe);
+    QSocketNotifier* notif = new QSocketNotifier(signal_pipe[0],
+	QSocketNotifier::Read, this );
+    connect( notif, SIGNAL(activated(int)), SLOT(signalPipeSignal()));
+}
+
+
+void LockProcess::signalPipeSignal()
+{
+    char tmp;
+    ::read( signal_pipe[0], &tmp, 1);
+    if( tmp == 'T' )
+        quitSaver();
+    else if( tmp == 'H' ) {
+        if( !mLocked )
+            startLock();
+    }
+}
+
+//---------------------------------------------------------------------------
+bool LockProcess::lock()
+{
+    if (startSaver()) {
+        // In case of a forced lock we don't react to events during
+        // the dead-time to give the screensaver some time to activate.
+        // That way we don't accidentally show the password dialog before
+        // the screensaver kicks in because the user moved the mouse after
+        // selecting "lock screen", that looks really untidy.
+        mBusy = true;
+        if (startLock())
+        {
+            QTimer::singleShot(1000, this, SLOT(slotDeadTimePassed()));
+            return true;
+        }
+        stopSaver();
+        mBusy = false;
+    }
+    return false;
+}
+//---------------------------------------------------------------------------
+void LockProcess::slotDeadTimePassed()
+{
+    mBusy = false;
+}
+
+//---------------------------------------------------------------------------
+bool LockProcess::defaultSave()
+{
+    mLocked = false;
+    if (startSaver()) {
+        if (mLockGrace >= 0)
+            QTimer::singleShot(mLockGrace, this, SLOT(startLock()));
+        return true;
+    }
+    return false;
+}
+
+//---------------------------------------------------------------------------
+bool LockProcess::dontLock()
+{
+    mLocked = false;
+    return startSaver();
+}
+
+//---------------------------------------------------------------------------
+void LockProcess::quitSaver()
+{
+    stopSaver();
+    kapp->quit();
+}
+
+//---------------------------------------------------------------------------
+//
+// Read and apply configuration.
+//
+void LockProcess::configure()
+{
+    // the configuration is stored in kdesktop's config file
+    if( KDesktopSettings::lock() )
+    {
+        mLockGrace = KDesktopSettings::lockGrace();
+        if (mLockGrace < 0)
+            mLockGrace = 0;
+        else if (mLockGrace > 300000)
+            mLockGrace = 300000; // 5 minutes, keep the value sane
+    }
+    else
+        mLockGrace = -1;
+
+    if ( KDesktopSettings::autoLogout() )
+    {
+        mAutoLogout = true;
+        mAutoLogoutTimeout = KDesktopSettings::autoLogoutTimeout();
+        mAutoLogoutTimerId = startTimer(mAutoLogoutTimeout * 1000); // in milliseconds
+    }
+
+#ifdef HAVE_DPMS
+    //if the user  decided that the screensaver should run independent from
+    //dpms, we shouldn't check for it, aleXXX
+    mDPMSDepend = KDesktopSettings::dpmsDependent();
+#endif
+
+    mPriority = KDesktopSettings::priority();
+    if (mPriority < 0) mPriority = 0;
+    if (mPriority > 19) mPriority = 19;
+
+    mSaver = KDesktopSettings::saver();
+    if (mSaver.isEmpty() || mUseBlankOnly)
+        mSaver = "KBlankscreen.desktop";
+
+    readSaver();
+
+    mPlugins = KDesktopSettings::pluginsUnlock();
+    if (mPlugins.isEmpty())
+        mPlugins = QStringList("classic");
+    mPluginOptions = KDesktopSettings::pluginOptions();
+}
+
+//---------------------------------------------------------------------------
+//
+// Read the command line needed to run the screensaver given a .desktop file.
+//
+void LockProcess::readSaver()
+{
+    if (!mSaver.isEmpty())
+    {
+        QString file = locate("scrsav", mSaver);
+
+	bool opengl = kapp->authorize("opengl_screensavers");
+	bool manipulatescreen = kapp->authorize("manipulatescreen_screensavers");
+        KDesktopFile config(file, true);
+	if (config.readEntry("X-KDE-Type").utf8())
+	{
+		QString saverType = config.readEntry("X-KDE-Type").utf8();
+		QStringList saverTypes = QStringList::split(";", saverType);
+		for (uint i = 0; i < saverTypes.count(); i++)
+		{
+			if ((saverTypes[i] == "ManipulateScreen") && !manipulatescreen)
+			{
+				kdDebug(1204) << "Screensaver is type ManipulateScreen and ManipulateScreen is forbidden" << endl;
+				mForbidden = true;
+			}
+			if ((saverTypes[i] == "OpenGL") && !opengl)
+			{
+				kdDebug(1204) << "Screensaver is type OpenGL and OpenGL is forbidden" << endl;
+				mForbidden = true;
+			}
+			if (saverTypes[i] == "OpenGL")
+			{
+				mOpenGLVisual = true;
+			}
+		}
+	}
+
+	kdDebug(1204) << "mForbidden: " << (mForbidden ? "true" : "false") << endl;
+
+        if (config.hasActionGroup("Root"))
+        {
+            config.setActionGroup("Root");
+            mSaverExec = config.readPathEntry("Exec");
+        }
+    }
+}
+
+//---------------------------------------------------------------------------
+//
+// Create a window to draw our screen saver on.
+//
+void LockProcess::createSaverWindow()
+{
+    Visual* visual = CopyFromParent;
+    XSetWindowAttributes attrs;
+    int flags = CWOverrideRedirect;
+#ifdef HAVE_GLXCHOOSEVISUAL
+    if( mOpenGLVisual )
+    {
+        static int attribs[][ 15 ] =
+        {
+        #define R GLX_RED_SIZE
+        #define G GLX_GREEN_SIZE
+        #define B GLX_BLUE_SIZE
+            { GLX_RGBA, R, 8, G, 8, B, 8, GLX_DEPTH_SIZE, 8, GLX_DOUBLEBUFFER, GLX_STENCIL_SIZE, 1, None },
+            { GLX_RGBA, R, 4, G, 4, B, 4, GLX_DEPTH_SIZE, 4, GLX_DOUBLEBUFFER, GLX_STENCIL_SIZE, 1, None },
+            { GLX_RGBA, R, 8, G, 8, B, 8, GLX_DEPTH_SIZE, 8, GLX_DOUBLEBUFFER, None },
+            { GLX_RGBA, R, 4, G, 4, B, 4, GLX_DEPTH_SIZE, 4, GLX_DOUBLEBUFFER, None },
+            { GLX_RGBA, R, 8, G, 8, B, 8, GLX_DEPTH_SIZE, 8, GLX_STENCIL_SIZE, 1, None },
+            { GLX_RGBA, R, 4, G, 4, B, 4, GLX_DEPTH_SIZE, 4, GLX_STENCIL_SIZE, 1, None },
+            { GLX_RGBA, R, 8, G, 8, B, 8, GLX_DEPTH_SIZE, 8, None },
+            { GLX_RGBA, R, 4, G, 4, B, 4, GLX_DEPTH_SIZE, 4, None },
+            { GLX_RGBA, GLX_DEPTH_SIZE, 8, GLX_DOUBLEBUFFER, GLX_STENCIL_SIZE, 1, None },
+            { GLX_RGBA, GLX_DEPTH_SIZE, 8, GLX_DOUBLEBUFFER, None },
+            { GLX_RGBA, GLX_DEPTH_SIZE, 8, GLX_STENCIL_SIZE, 1, None },
+            { GLX_RGBA, GLX_DEPTH_SIZE, 8, None }
+        #undef R
+        #undef G
+        #undef B
+        };
+        for( unsigned int i = 0;
+             i < sizeof( attribs ) / sizeof( attribs[ 0 ] );
+             ++i )
+        {
+            if( XVisualInfo* info = glXChooseVisual( x11Display(), x11Screen(), attribs[ i ] ))
+            {
+                visual = info->visual;
+                static Colormap colormap = 0;
+                if( colormap != 0 )
+                    XFreeColormap( x11Display(), colormap );
+                colormap = XCreateColormap( x11Display(), RootWindow( x11Display(), x11Screen()), visual, AllocNone );
+                attrs.colormap = colormap;
+                flags |= CWColormap;
+                XFree( info );
+                break;
+            }
+        }
+    }
+#endif
+
+    attrs.override_redirect = 1;
+    hide();
+    Window w = XCreateWindow( x11Display(), RootWindow( x11Display(), x11Screen()),
+        x(), y(), width(), height(), 0, x11Depth(), InputOutput, visual, flags, &attrs );
+    create( w );
+
+    // Some xscreensaver hacks check for this property
+    const char *version = "KDE 2.0";
+    XChangeProperty (qt_xdisplay(), winId(),
+                     gXA_SCREENSAVER_VERSION, XA_STRING, 8, PropModeReplace,
+                     (unsigned char *) version, strlen(version));
+
+    XSetWindowAttributes attr;
+    attr.event_mask = KeyPressMask | ButtonPressMask | PointerMotionMask |
+                        VisibilityChangeMask | ExposureMask;
+    XChangeWindowAttributes(qt_xdisplay(), winId(),
+                            CWEventMask, &attr);
+
+    // erase();
+
+    // set NoBackground so that the saver can capture the current
+    // screen state if necessary
+    setBackgroundMode(QWidget::NoBackground);
+
+    setCursor( blankCursor );
+    setGeometry(0, 0, mRootWidth, mRootHeight);
+
+    kdDebug(1204) << "Saver window Id: " << winId() << endl;
+}
+
+//---------------------------------------------------------------------------
+//
+// Hide the screensaver window
+//
+void LockProcess::hideSaverWindow()
+{
+  hide();
+  lower();
+  removeVRoot(winId());
+  XDeleteProperty(qt_xdisplay(), winId(), gXA_SCREENSAVER_VERSION);
+  if ( gVRoot ) {
+      unsigned long vroot_data[1] = { gVRootData };
+      XChangeProperty(qt_xdisplay(), gVRoot, gXA_VROOT, XA_WINDOW, 32,
+                      PropModeReplace, (unsigned char *)vroot_data, 1);
+      gVRoot = 0;
+  }
+  XSync(qt_xdisplay(), False);
+}
+
+//---------------------------------------------------------------------------
+static int ignoreXError(Display *, XErrorEvent *)
+{
+    return 0;
+}
+
+//---------------------------------------------------------------------------
+//
+// Save the current virtual root window
+//
+void LockProcess::saveVRoot()
+{
+  Window rootReturn, parentReturn, *children;
+  unsigned int numChildren;
+  Window root = RootWindowOfScreen(ScreenOfDisplay(qt_xdisplay(), qt_xscreen()));
+
+  gVRoot = 0;
+  gVRootData = 0;
+
+  int (*oldHandler)(Display *, XErrorEvent *);
+  oldHandler = XSetErrorHandler(ignoreXError);
+
+  if (XQueryTree(qt_xdisplay(), root, &rootReturn, &parentReturn,
+      &children, &numChildren))
+  {
+    for (unsigned int i = 0; i < numChildren; i++)
+    {
+      Atom actual_type;
+      int actual_format;
+      unsigned long nitems, bytesafter;
+      unsigned char *newRoot = 0;
+
+      if ((XGetWindowProperty(qt_xdisplay(), children[i], gXA_VROOT, 0, 1,
+          False, XA_WINDOW, &actual_type, &actual_format, &nitems, &bytesafter,
+          &newRoot) == Success) && newRoot)
+      {
+        gVRoot = children[i];
+        Window *dummy = (Window*)newRoot;
+        gVRootData = *dummy;
+        XFree ((char*) newRoot);
+        break;
+      }
+    }
+    if (children)
+    {
+      XFree((char *)children);
+    }
+  }
+
+  XSetErrorHandler(oldHandler);
+}
+
+//---------------------------------------------------------------------------
+//
+// Set the virtual root property
+//
+void LockProcess::setVRoot(Window win, Window vr)
+{
+    if (gVRoot)
+        removeVRoot(gVRoot);
+
+    unsigned long rw = RootWindowOfScreen(ScreenOfDisplay(qt_xdisplay(), qt_xscreen()));
+    unsigned long vroot_data[1] = { vr };
+
+    Window rootReturn, parentReturn, *children;
+    unsigned int numChildren;
+    Window top = win;
+    while (1) {
+        XQueryTree(qt_xdisplay(), top , &rootReturn, &parentReturn,
+                                 &children, &numChildren);
+        if (children)
+            XFree((char *)children);
+        if (parentReturn == rw) {
+            break;
+        } else
+            top = parentReturn;
+    }
+
+    XChangeProperty(qt_xdisplay(), top, gXA_VROOT, XA_WINDOW, 32,
+                     PropModeReplace, (unsigned char *)vroot_data, 1);
+}
+
+//---------------------------------------------------------------------------
+//
+// Remove the virtual root property
+//
+void LockProcess::removeVRoot(Window win)
+{
+    XDeleteProperty (qt_xdisplay(), win, gXA_VROOT);
+}
+
+//---------------------------------------------------------------------------
+//
+// Grab the keyboard. Returns true on success
+//
+bool LockProcess::grabKeyboard()
+{
+    int rv = XGrabKeyboard( qt_xdisplay(), QApplication::desktop()->winId(),
+        True, GrabModeAsync, GrabModeAsync, CurrentTime );
+
+    return (rv == GrabSuccess);
+}
+
+#define GRABEVENTS ButtonPressMask | ButtonReleaseMask | PointerMotionMask | \
+		   EnterWindowMask | LeaveWindowMask
+
+//---------------------------------------------------------------------------
+//
+// Grab the mouse.  Returns true on success
+//
+bool LockProcess::grabMouse()
+{
+    int rv = XGrabPointer( qt_xdisplay(), QApplication::desktop()->winId(),
+            True, GRABEVENTS, GrabModeAsync, GrabModeAsync, None,
+            blankCursor.handle(), CurrentTime );
+
+    return (rv == GrabSuccess);
+}
+
+//---------------------------------------------------------------------------
+//
+// Grab keyboard and mouse.  Returns true on success.
+//
+bool LockProcess::grabInput()
+{
+    XSync(qt_xdisplay(), False);
+
+    if (!grabKeyboard())
+    {
+        sleep(1);
+        if (!grabKeyboard())
+        {
+            return false;
+        }
+    }
+
+    if (!grabMouse())
+    {
+        sleep(1);
+        if (!grabMouse())
+        {
+            XUngrabKeyboard(qt_xdisplay(), CurrentTime);
+            return false;
+        }
+    }
+
+    lockXF86();
+
+    return true;
+}
+
+//---------------------------------------------------------------------------
+//
+// Release mouse an keyboard grab.
+//
+void LockProcess::ungrabInput()
+{
+    XUngrabKeyboard(qt_xdisplay(), CurrentTime);
+    XUngrabPointer(qt_xdisplay(), CurrentTime);
+    unlockXF86();
+}
+
+//---------------------------------------------------------------------------
+//
+// Start the screen saver.
+//
+bool LockProcess::startSaver()
+{
+    if (!child_saver && !grabInput())
+    {
+        kdWarning(1204) << "LockProcess::startSaver() grabInput() failed!!!!" << endl;
+        return false;
+    }
+    mBusy = false;
+
+    saveVRoot();
+
+    if (mParent) {
+        QSocketNotifier *notifier = new QSocketNotifier(mParent, QSocketNotifier::Read, this, "notifier");
+        connect(notifier, SIGNAL( activated (int)), SLOT( quitSaver()));
+    }
+    createSaverWindow();
+    move(0, 0);
+    show();
+    setCursor( blankCursor );
+
+    raise();
+    XSync(qt_xdisplay(), False);
+    setVRoot( winId(), winId() );
+    startHack();
+    return true;
+}
+
+//---------------------------------------------------------------------------
+//
+// Stop the screen saver.
+//
+void LockProcess::stopSaver()
+{
+    kdDebug(1204) << "LockProcess: stopping saver" << endl;
+    resume( true );
+    stopHack();
+    hideSaverWindow();
+    mVisibility = false;
+    if (!child_saver) {
+        if (mLocked)
+            DM().setLock( false );
+        ungrabInput();
+        const char *out = "GOAWAY!";
+        for (QValueList<int>::ConstIterator it = child_sockets.begin(); it != child_sockets.end(); ++it)
+            write(*it, out, sizeof(out));
+    }
+}
+
+// private static
+QVariant LockProcess::getConf(void *ctx, const char *key, const QVariant &dflt)
+{
+    LockProcess *that = (LockProcess *)ctx;
+    QString fkey = QString::fromLatin1( key ) + '=';
+    for (QStringList::ConstIterator it = that->mPluginOptions.begin();
+         it != that->mPluginOptions.end(); ++it)
+        if ((*it).startsWith( fkey ))
+            return (*it).mid( fkey.length() );
+    return dflt;
+}
+
+void LockProcess::cantLock( const QString &txt)
+{
+    msgBox( QMessageBox::Critical, i18n("Will not lock the session, as unlocking would be impossible:\n") + txt );
+}
+
+#if 0 // placeholders for later
+i18n("Cannot start <i>kcheckpass</i>.");
+i18n("<i>kcheckpass</i> is unable to operate. Possibly it is not SetUID root.");
+#endif
+
+//---------------------------------------------------------------------------
+//
+// Make the screen saver password protected.
+//
+bool LockProcess::startLock()
+{
+    for (QStringList::ConstIterator it = mPlugins.begin(); it != mPlugins.end(); ++it) {
+        GreeterPluginHandle plugin;
+        QString path = KLibLoader::self()->findLibrary(
+                    ((*it)[0] == '/' ? *it : "kgreet_" + *it ).latin1() );
+        if (path.isEmpty()) {
+            kdWarning(1204) << "GreeterPlugin " << *it << " does not exist" << endl;
+            continue;
+        }
+        if (!(plugin.library = KLibLoader::self()->library( path.latin1() ))) {
+            kdWarning(1204) << "Cannot load GreeterPlugin " << *it << " (" << path << ")" << endl;
+            continue;
+        }
+        if (!plugin.library->hasSymbol( "kgreeterplugin_info" )) {
+            kdWarning(1204) << "GreeterPlugin " << *it << " (" << path << ") is no valid greet widget plugin" << endl;
+            plugin.library->unload();
+            continue;
+        }
+        plugin.info = (kgreeterplugin_info*)plugin.library->symbol( "kgreeterplugin_info" );
+        if (plugin.info->method && !mMethod.isEmpty() && mMethod != plugin.info->method) {
+            kdDebug(1204) << "GreeterPlugin " << *it << " (" << path << ") serves " << plugin.info->method << ", not " << mMethod << endl;
+            plugin.library->unload();
+            continue;
+        }
+        if (!plugin.info->init( mMethod, getConf, this )) {
+            kdDebug(1204) << "GreeterPlugin " << *it << " (" << path << ") refuses to serve " << mMethod << endl;
+            plugin.library->unload();
+            continue;
+        }
+        kdDebug(1204) << "GreeterPlugin " << *it << " (" << plugin.info->method << ", " << plugin.info->name << ") loaded" << endl;
+        greetPlugin = plugin;
+	mLocked = true;
+	DM().setLock( true );
+	return true;
+    }
+    cantLock( i18n("No appropriate greeter plugin configured.") );
+    return false;
+}
+
+//---------------------------------------------------------------------------
+//
+
+
+bool LockProcess::startHack()
+{
+    if (mSaverExec.isEmpty())
+    {
+        return false;
+    }
+
+    if (mHackProc.isRunning())
+    {
+        stopHack();
+    }
+
+    mHackProc.clearArguments();
+
+    QTextStream ts(&mSaverExec, IO_ReadOnly);
+    QString word;
+    ts >> word;
+    QString path = KStandardDirs::findExe(word);
+
+    if (!path.isEmpty())
+    {
+        mHackProc << path;
+
+        kdDebug(1204) << "Starting hack: " << path << endl;
+
+        while (!ts.atEnd())
+        {
+            ts >> word;
+            if (word == "%w")
+            {
+                word = word.setNum(winId());
+            }
+            mHackProc << word;
+        }
+
+	if (!mForbidden)
+	{
+
+		if (mHackProc.start() == true)
+		{
+#ifdef HAVE_SETPRIORITY
+			setpriority(PRIO_PROCESS, mHackProc.pid(), mPriority);
+#endif
+ 		        //bitBlt(this, 0, 0, &mOriginal);
+	                return true;
+		}
+	}
+	else
+	// we aren't allowed to start the specified screensaver either because it didn't run for some reason
+	// according to the kiosk restrictions forbid it
+	{
+		setBackgroundColor(black);
+	}
+    }
+    return false;
+}
+
+//---------------------------------------------------------------------------
+//
+void LockProcess::stopHack()
+{
+    if (mHackProc.isRunning())
+    {
+        mHackProc.kill();
+        if (!mHackProc.wait(10))
+        {
+            mHackProc.kill(SIGKILL);
+        }
+    }
+}
+
+//---------------------------------------------------------------------------
+//
+void LockProcess::hackExited(KProcess *)
+{
+	// Hack exited while we're supposed to be saving the screen.
+	// Make sure the saver window is black.
+        setBackgroundColor(black);
+}
+
+void LockProcess::suspend()
+{
+    if(!mSuspended)
+    {
+        mHackProc.kill(SIGSTOP);
+        QApplication::syncX();
+        mSavedScreen = QPixmap::grabWindow( winId());
+    }
+    mSuspended = true;
+}
+
+void LockProcess::resume( bool force )
+{
+    if( !force && (!mDialogs.isEmpty() || !mVisibility ))
+        return; // no resuming with dialog visible or when not visible
+    if(mSuspended)
+    {
+        XForceScreenSaver(qt_xdisplay(), ScreenSaverReset );
+        bitBlt( this, 0, 0, &mSavedScreen );
+        QApplication::syncX();
+        mHackProc.kill(SIGCONT);
+    }
+    mSuspended = false;
+}
+
+//---------------------------------------------------------------------------
+//
+// Show the password dialog
+// This is called only in the master process
+//
+bool LockProcess::checkPass()
+{
+    if (mAutoLogout)
+        killTimer(mAutoLogoutTimerId);
+
+    PasswordDlg passDlg( this, &greetPlugin);
+
+    int ret = execDialog( &passDlg );
+
+    XWindowAttributes rootAttr;
+    XGetWindowAttributes(qt_xdisplay(), RootWindow(qt_xdisplay(),
+                        qt_xscreen()), &rootAttr);
+    if(( rootAttr.your_event_mask & SubstructureNotifyMask ) == 0 )
+    {
+        kdWarning() << "ERROR: Something removed SubstructureNotifyMask from the root window!!!" << endl;
+        XSelectInput( qt_xdisplay(), qt_xrootwin(),
+            SubstructureNotifyMask | rootAttr.your_event_mask );
+    }
+
+    return ret == QDialog::Accepted;
+}
+
+static void fakeFocusIn( WId window )
+{
+    // We have keyboard grab, so this application will
+    // get keyboard events even without having focus.
+    // Fake FocusIn to make Qt realize it has the active
+    // window, so that it will correctly show cursor in the dialog.
+    XEvent ev;
+    memset(&ev, 0, sizeof(ev));
+    ev.xfocus.display = qt_xdisplay();
+    ev.xfocus.type = FocusIn;
+    ev.xfocus.window = window;
+    ev.xfocus.mode = NotifyNormal;
+    ev.xfocus.detail = NotifyAncestor;
+    XSendEvent( qt_xdisplay(), window, False, NoEventMask, &ev );
+}
+
+int LockProcess::execDialog( QDialog *dlg )
+{
+    dlg->adjustSize();
+
+    QRect rect = dlg->geometry();
+    rect.moveCenter(KGlobalSettings::desktopGeometry(QCursor::pos()).center());
+    dlg->move( rect.topLeft() );
+
+    if (mDialogs.isEmpty())
+    {
+        suspend();
+        XChangeActivePointerGrab( qt_xdisplay(), GRABEVENTS,
+                arrowCursor.handle(), CurrentTime);
+    }
+    mDialogs.prepend( dlg );
+    fakeFocusIn( dlg->winId());
+    int rt = dlg->exec();
+    mDialogs.remove( dlg );
+    if( mDialogs.isEmpty() ) {
+        XChangeActivePointerGrab( qt_xdisplay(), GRABEVENTS,
+                blankCursor.handle(), CurrentTime);
+        resume( false );
+    } else
+        fakeFocusIn( mDialogs.first()->winId());
+    return rt;
+}
+
+void LockProcess::preparePopup()
+{
+    QWidget *dlg = (QWidget *)sender();
+    mDialogs.prepend( dlg );
+    fakeFocusIn( dlg->winId() );
+}
+
+void LockProcess::cleanupPopup()
+{
+    QWidget *dlg = (QWidget *)sender();
+    mDialogs.remove( dlg );
+    fakeFocusIn( mDialogs.first()->winId() );
+}
+
+//---------------------------------------------------------------------------
+//
+// X11 Event.
+//
+bool LockProcess::x11Event(XEvent *event)
+{
+    switch (event->type)
+    {
+        case KeyPress:
+        case ButtonPress:
+        case MotionNotify:
+            if (mBusy || !mDialogs.isEmpty())
+                break;
+            mBusy = true;
+            if (!mLocked || checkPass())
+            {
+                stopSaver();
+                kapp->quit();
+            }
+            else if (mAutoLogout) // we need to restart the auto logout countdown
+            {
+                killTimer(mAutoLogoutTimerId);
+                mAutoLogoutTimerId = startTimer(mAutoLogoutTimeout);
+            }
+            mBusy = false;
+            return true;
+
+        case VisibilityNotify:
+            if( event->xvisibility.window == winId())
+            {  // mVisibility == false means the screensaver is not visible at all
+               // e.g. when switched to text console
+                mVisibility = !(event->xvisibility.state == VisibilityFullyObscured);
+                if(!mVisibility)
+                    mSuspendTimer.start(2000, true);
+                else
+                {
+                    mSuspendTimer.stop();
+                    resume( false );
+                }
+                if (event->xvisibility.state != VisibilityUnobscured)
+                    stayOnTop();
+            }
+            break;
+
+        case ConfigureNotify: // from SubstructureNotifyMask on the root window
+            if(event->xconfigure.event == qt_xrootwin())
+                stayOnTop();
+            break;
+        case MapNotify: // from SubstructureNotifyMask on the root window
+            if( event->xmap.event == qt_xrootwin())
+                stayOnTop();
+            break;
+    }
+
+    // We have grab with the grab window being the root window.
+    // This results in key events being sent to the root window,
+    // but they should be sent to the dialog if it's visible.
+    // It could be solved by setFocus() call, but that would mess
+    // the focus after this process exits.
+    // Qt seems to be quite hard to persuade to redirect the event,
+    // so let's simply dupe it with correct destination window,
+    // and ignore the original one.
+    if(!mDialogs.isEmpty() && ( event->type == KeyPress || event->type == KeyRelease)
+        && event->xkey.window != mDialogs.first()->winId())
+    {
+        XEvent ev2 = *event;
+        ev2.xkey.window = ev2.xkey.subwindow = mDialogs.first()->winId();
+        qApp->x11ProcessEvent( &ev2 );
+        return true;
+    }
+
+    return false;
+}
+
+void LockProcess::stayOnTop()
+{
+    if(!mDialogs.isEmpty())
+    {
+        // this restacking is written in a way so that
+        // if the stacking positions actually don't change,
+        // all restacking operations will be no-op,
+        // and no ConfigureNotify will be generated,
+        // thus avoiding possible infinite loops
+        XRaiseWindow( qt_xdisplay(), mDialogs.first()->winId()); // raise topmost
+        // and stack others below it
+        Window* stack = new Window[ mDialogs.count() + 1 ];
+        int count = 0;
+        for( QValueList< QWidget* >::ConstIterator it = mDialogs.begin();
+             it != mDialogs.end();
+             ++it )
+            stack[ count++ ] = (*it)->winId();
+        stack[ count++ ] = winId();
+        XRestackWindows( x11Display(), stack, count );
+        delete[] stack;
+    }
+    else
+        XRaiseWindow(qt_xdisplay(), winId());
+}
+
+void LockProcess::checkDPMSActive()
+{
+#ifdef HAVE_DPMS
+    BOOL on;
+    CARD16 state;
+    DPMSInfo(qt_xdisplay(), &state, &on);
+    //kdDebug() << "checkDPMSActive " << on << " " << state << endl;
+    if (state == DPMSModeStandby || state == DPMSModeSuspend || state == DPMSModeOff)
+    {
+       suspend();
+    } else if ( mSuspended )
+    {
+        resume( true );
+    }
+#endif
+}
+
+#if defined(HAVE_XF86MISC) && defined(HAVE_XF86MISCSETGRABKEYSSTATE)
+// see http://cvsweb.xfree86.org/cvsweb/xc/programs/Xserver/hw/xfree86/common/xf86Events.c#rev3.113
+// This allows enabling the "Allow{Deactivate/Closedown}Grabs" options in XF86Config,
+// and kdesktop_lock will still lock the session.
+static enum { Unknown, Yes, No } can_do_xf86_lock = Unknown;
+void LockProcess::lockXF86()
+{
+    if( can_do_xf86_lock == Unknown )
+    {
+        int major, minor;
+        if( XF86MiscQueryVersion( qt_xdisplay(), &major, &minor )
+            && major >= 0 && minor >= 5 )
+            can_do_xf86_lock = Yes;
+        else
+            can_do_xf86_lock = No;
+    }
+    if( can_do_xf86_lock != Yes )
+        return;
+    if( mRestoreXF86Lock )
+        return;
+    if( XF86MiscSetGrabKeysState( qt_xdisplay(), False ) != MiscExtGrabStateSuccess )
+        return;
+    // success
+    mRestoreXF86Lock = true;
+}
+
+void LockProcess::unlockXF86()
+{
+    if( can_do_xf86_lock != Yes )
+        return;
+    if( !mRestoreXF86Lock )
+        return;
+    XF86MiscSetGrabKeysState( qt_xdisplay(), True );
+    mRestoreXF86Lock = false;
+}
+#else
+void LockProcess::lockXF86()
+{
+}
+
+void LockProcess::unlockXF86()
+{
+}
+#endif
+
+void LockProcess::msgBox( QMessageBox::Icon type, const QString &txt )
+{
+    QDialog box( 0, "messagebox", true, WX11BypassWM );
+    QFrame *winFrame = new QFrame( &box );
+    winFrame->setFrameStyle( QFrame::WinPanel | QFrame::Raised );
+    winFrame->setLineWidth( 2 );
+    QLabel *label1 = new QLabel( winFrame );
+    label1->setPixmap( QMessageBox::standardIcon( type ) );
+    QLabel *label2 = new QLabel( txt, winFrame );
+    KPushButton *button = new KPushButton( KStdGuiItem::ok(), winFrame );
+    button->setDefault( true );
+    button->setSizePolicy( QSizePolicy( QSizePolicy::Preferred, QSizePolicy::Preferred ) );
+    connect( button, SIGNAL( clicked() ), &box, SLOT( accept() ) );
+
+    QVBoxLayout *vbox = new QVBoxLayout( &box );
+    vbox->addWidget( winFrame );
+    QGridLayout *grid = new QGridLayout( winFrame, 2, 2, 10 );
+    grid->addWidget( label1, 0, 0, Qt::AlignCenter );
+    grid->addWidget( label2, 0, 1, Qt::AlignCenter );
+    grid->addMultiCellWidget( button, 1,1, 0,1, Qt::AlignCenter );
+
+    execDialog( &box );
+}
+
+#include "lockprocess.moc"