Adding upstream version 1:7.0.4.upstream/1%7.0.4upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 782 insertions, 0 deletions

diff --git a/vcl/unx/generic/app/saldata.cxx b/vcl/unx/generic/app/saldata.cxx
new file mode 100644
index 000000000..f2fe146f5
--- /dev/null
+++ b/vcl/unx/generic/app/saldata.cxx
@@ -0,0 +1,782 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#include <unistd.h>
+#include <fcntl.h>
+
+#include <cstdio>
+#include <cstdlib>
+#include <errno.h>
+#ifdef SUN
+#include <sys/systeminfo.h>
+#endif
+#ifdef AIX
+#include <strings.h>
+#endif
+#ifdef FREEBSD
+#include <sys/types.h>
+#include <sys/time.h>
+#endif
+
+#include <osl/process.h>
+
+#include <unx/saldisp.hxx>
+#include <unx/saldata.hxx>
+#include <unx/salunxtime.h>
+#include <unx/sm.hxx>
+#include <unx/i18n_im.hxx>
+
+#include <X11/Xlib.h>
+#include <X11/Xproto.h>
+
+#include <salinst.hxx>
+#include <saltimer.hxx>
+
+#include <osl/diagnose.h>
+#include <osl/signal.h>
+#include <osl/thread.h>
+#include <sal/log.hxx>
+
+#include <vcl/svapp.hxx>
+
+X11SalData* GetX11SalData()
+{
+    SalData * p1 = ImplGetSVData()->mpSalData;
+    OSL_ASSERT(p1 != nullptr);
+    X11SalData * p2 = dynamic_cast< X11SalData * >(p1);
+    OSL_ASSERT(p2 != nullptr);
+    return p2;
+}
+
+extern "C" {
+
+static int XErrorHdl( Display *pDisplay, XErrorEvent *pEvent )
+{
+    GetX11SalData()->XError( pDisplay, pEvent );
+    return 0;
+}
+
+static int XIOErrorHdl( Display * )
+{
+    if ( Application::IsMainThread() )
+    {
+        /*  #106197# hack: until a real shutdown procedure exists
+         *  _exit ASAP
+         */
+        if( ImplGetSVData()->maAppData.mbAppQuit )
+            _exit(1);
+
+        // really bad hack
+        if( ! SessionManagerClient::checkDocumentsSaved() )
+            /* oslSignalAction eToDo = */ osl_raiseSignal (OSL_SIGNAL_USER_X11SUBSYSTEMERROR, nullptr);
+    }
+
+    std::fprintf( stderr, "X IO Error\n" );
+    std::fflush( stdout );
+    std::fflush( stderr );
+
+    /*  #106197# the same reasons to use _exit instead of exit in salmain
+     *  do apply here. Since there is nothing to be done after an XIO
+     *  error we have to _exit immediately.
+     */
+    _exit(1);
+    return 0;
+}
+
+}
+
+static const struct timeval noyield_ = { 0, 0 };
+static const struct timeval yield_   = { 0, 10000 };
+
+static const char* XRequest[] = {
+    // see /usr/lib/X11/XErrorDB, /usr/openwin/lib/XErrorDB ...
+    nullptr,
+    "X_CreateWindow",
+    "X_ChangeWindowAttributes",
+    "X_GetWindowAttributes",
+    "X_DestroyWindow",
+    "X_DestroySubwindows",
+    "X_ChangeSaveSet",
+    "X_ReparentWindow",
+    "X_MapWindow",
+    "X_MapSubwindows",
+    "X_UnmapWindow",
+    "X_UnmapSubwindows",
+    "X_ConfigureWindow",
+    "X_CirculateWindow",
+    "X_GetGeometry",
+    "X_QueryTree",
+    "X_InternAtom",
+    "X_GetAtomName",
+    "X_ChangeProperty",
+    "X_DeleteProperty",
+    "X_GetProperty",
+    "X_ListProperties",
+    "X_SetSelectionOwner",
+    "X_GetSelectionOwner",
+    "X_ConvertSelection",
+    "X_SendEvent",
+    "X_GrabPointer",
+    "X_UngrabPointer",
+    "X_GrabButton",
+    "X_UngrabButton",
+    "X_ChangeActivePointerGrab",
+    "X_GrabKeyboard",
+    "X_UngrabKeyboard",
+    "X_GrabKey",
+    "X_UngrabKey",
+    "X_AllowEvents",
+    "X_GrabServer",
+    "X_UngrabServer",
+    "X_QueryPointer",
+    "X_GetMotionEvents",
+    "X_TranslateCoords",
+    "X_WarpPointer",
+    "X_SetInputFocus",
+    "X_GetInputFocus",
+    "X_QueryKeymap",
+    "X_OpenFont",
+    "X_CloseFont",
+    "X_QueryFont",
+    "X_QueryTextExtents",
+    "X_ListFonts",
+    "X_ListFontsWithInfo",
+    "X_SetFontPath",
+    "X_GetFontPath",
+    "X_CreatePixmap",
+    "X_FreePixmap",
+    "X_CreateGC",
+    "X_ChangeGC",
+    "X_CopyGC",
+    "X_SetDashes",
+    "X_SetClipRectangles",
+    "X_FreeGC",
+    "X_ClearArea",
+    "X_CopyArea",
+    "X_CopyPlane",
+    "X_PolyPoint",
+    "X_PolyLine",
+    "X_PolySegment",
+    "X_PolyRectangle",
+    "X_PolyArc",
+    "X_FillPoly",
+    "X_PolyFillRectangle",
+    "X_PolyFillArc",
+    "X_PutImage",
+    "X_GetImage",
+    "X_PolyText8",
+    "X_PolyText16",
+    "X_ImageText8",
+    "X_ImageText16",
+    "X_CreateColormap",
+    "X_FreeColormap",
+    "X_CopyColormapAndFree",
+    "X_InstallColormap",
+    "X_UninstallColormap",
+    "X_ListInstalledColormaps",
+    "X_AllocColor",
+    "X_AllocNamedColor",
+    "X_AllocColorCells",
+    "X_AllocColorPlanes",
+    "X_FreeColors",
+    "X_StoreColors",
+    "X_StoreNamedColor",
+    "X_QueryColors",
+    "X_LookupColor",
+    "X_CreateCursor",
+    "X_CreateGlyphCursor",
+    "X_FreeCursor",
+    "X_RecolorCursor",
+    "X_QueryBestSize",
+    "X_QueryExtension",
+    "X_ListExtensions",
+    "X_ChangeKeyboardMapping",
+    "X_GetKeyboardMapping",
+    "X_ChangeKeyboardControl",
+    "X_GetKeyboardControl",
+    "X_Bell",
+    "X_ChangePointerControl",
+    "X_GetPointerControl",
+    "X_SetScreenSaver",
+    "X_GetScreenSaver",
+    "X_ChangeHosts",
+    "X_ListHosts",
+    "X_SetAccessControl",
+    "X_SetCloseDownMode",
+    "X_KillClient",
+    "X_RotateProperties",
+    "X_ForceScreenSaver",
+    "X_SetPointerMapping",
+    "X_GetPointerMapping",
+    "X_SetModifierMapping",
+    "X_GetModifierMapping",
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    "X_NoOperation"
+};
+
+X11SalData::X11SalData( GenericUnixSalDataType t, SalInstance *pInstance )
+    : GenericUnixSalData( t, pInstance )
+{
+    pXLib_          = nullptr;
+
+    m_aOrigXIOErrorHandler = XSetIOErrorHandler ( XIOErrorHdl );
+    PushXErrorLevel( !!getenv( "SAL_IGNOREXERRORS" ) );
+}
+
+X11SalData::~X11SalData()
+{
+    DeleteDisplay();
+    PopXErrorLevel();
+    XSetIOErrorHandler (m_aOrigXIOErrorHandler);
+}
+
+void X11SalData::Dispose()
+{
+    delete GetDisplay();
+    SetSalData( nullptr );
+}
+
+void X11SalData::DeleteDisplay()
+{
+    delete GetDisplay();
+    SetDisplay( nullptr );
+    pXLib_.reset();
+}
+
+void X11SalData::Init()
+{
+    pXLib_.reset(new SalXLib());
+    pXLib_->Init();
+}
+
+void X11SalData::ErrorTrapPush()
+{
+    PushXErrorLevel( true );
+}
+
+bool X11SalData::ErrorTrapPop( bool bIgnoreError )
+{
+    bool err = false;
+    if( !bIgnoreError )
+        err = HasXErrorOccurred();
+    ResetXErrorOccurred();
+    PopXErrorLevel();
+    return err;
+}
+
+void X11SalData::PushXErrorLevel( bool bIgnore )
+{
+    m_aXErrorHandlerStack.emplace_back( );
+    XErrorStackEntry& rEnt = m_aXErrorHandlerStack.back();
+    rEnt.m_bWas = false;
+    rEnt.m_bIgnore = bIgnore;
+    rEnt.m_aHandler = XSetErrorHandler( XErrorHdl );
+}
+
+void X11SalData::PopXErrorLevel()
+{
+    if( !m_aXErrorHandlerStack.empty() )
+    {
+        XSetErrorHandler( m_aXErrorHandlerStack.back().m_aHandler );
+        m_aXErrorHandlerStack.pop_back();
+    }
+}
+
+SalXLib::SalXLib()
+{
+    m_aTimeout.tv_sec       = 0;
+    m_aTimeout.tv_usec      = 0;
+    m_nTimeoutMS            = 0;
+
+    nFDs_                   = 0;
+    FD_ZERO( &aReadFDS_ );
+    FD_ZERO( &aExceptionFDS_ );
+
+    m_pInputMethod          = nullptr;
+    m_pDisplay              = nullptr;
+
+    m_pTimeoutFDS[0] = m_pTimeoutFDS[1] = -1;
+    if (pipe (m_pTimeoutFDS) != -1)
+    {
+        // initialize 'wakeup' pipe.
+        int flags;
+
+        // set close-on-exec descriptor flag.
+        if ((flags = fcntl (m_pTimeoutFDS[0], F_GETFD)) != -1)
+        {
+            flags |= FD_CLOEXEC;
+            (void)fcntl(m_pTimeoutFDS[0], F_SETFD, flags);
+        }
+        if ((flags = fcntl (m_pTimeoutFDS[1], F_GETFD)) != -1)
+        {
+            flags |= FD_CLOEXEC;
+            (void)fcntl(m_pTimeoutFDS[1], F_SETFD, flags);
+        }
+
+        // set non-blocking I/O flag.
+        if ((flags = fcntl (m_pTimeoutFDS[0], F_GETFL)) != -1)
+        {
+            flags |= O_NONBLOCK;
+            (void)fcntl(m_pTimeoutFDS[0], F_SETFL, flags);
+        }
+        if ((flags = fcntl (m_pTimeoutFDS[1], F_GETFL)) != -1)
+        {
+            flags |= O_NONBLOCK;
+            (void)fcntl(m_pTimeoutFDS[1], F_SETFL, flags);
+        }
+
+        // insert [0] into read descriptor set.
+        FD_SET( m_pTimeoutFDS[0], &aReadFDS_ );
+        nFDs_ = m_pTimeoutFDS[0] + 1;
+    }
+}
+
+SalXLib::~SalXLib()
+{
+    // close 'wakeup' pipe.
+    close (m_pTimeoutFDS[0]);
+    close (m_pTimeoutFDS[1]);
+
+    m_pInputMethod.reset();
+}
+
+static Display *OpenX11Display(OString& rDisplay)
+{
+    /*
+     * open connection to X11 Display
+     * try in this order:
+     *  o  -display command line parameter,
+     *  o  $DISPLAY environment variable
+     *  o  default display
+     */
+
+    Display *pDisp = nullptr;
+
+    // is there a -display command line parameter?
+
+    sal_uInt32 nParams = osl_getCommandArgCount();
+    OUString aParam;
+    for (sal_uInt32 i=0; i<nParams; i++)
+    {
+        osl_getCommandArg(i, &aParam.pData);
+        if ( aParam == "-display" )
+        {
+            osl_getCommandArg(i+1, &aParam.pData);
+            rDisplay = OUStringToOString(
+                   aParam, osl_getThreadTextEncoding());
+
+            if ((pDisp = XOpenDisplay(rDisplay.getStr()))!=nullptr)
+            {
+                /*
+                 * if a -display switch was used, we need
+                 * to set the environment accordingly since
+                 * the clipboard build another connection
+                 * to the xserver using $DISPLAY
+                 */
+                OUString envVar("DISPLAY");
+                osl_setEnvironment(envVar.pData, aParam.pData);
+            }
+            break;
+        }
+    }
+
+    if (!pDisp && rDisplay.isEmpty())
+    {
+        // Open $DISPLAY or default...
+        char *pDisplay = getenv("DISPLAY");
+        if (pDisplay != nullptr)
+            rDisplay = OString(pDisplay);
+        pDisp  = XOpenDisplay(pDisplay);
+    }
+
+    return pDisp;
+}
+
+void SalXLib::Init()
+{
+    m_pInputMethod.reset( new SalI18N_InputMethod );
+    m_pInputMethod->SetLocale();
+    XrmInitialize();
+
+    OString aDisplay;
+    m_pDisplay = OpenX11Display(aDisplay);
+
+    if ( m_pDisplay )
+        return;
+
+    OUString aProgramFileURL;
+    osl_getExecutableFile( &aProgramFileURL.pData );
+    OUString aProgramSystemPath;
+    osl_getSystemPathFromFileURL (aProgramFileURL.pData, &aProgramSystemPath.pData);
+    OString  aProgramName = OUStringToOString(
+                                        aProgramSystemPath,
+                                        osl_getThreadTextEncoding() );
+    std::fprintf( stderr, "%s X11 error: Can't open display: %s\n",
+            aProgramName.getStr(), aDisplay.getStr());
+    std::fprintf( stderr, "   Set DISPLAY environment variable, use -display option\n");
+    std::fprintf( stderr, "   or check permissions of your X-Server\n");
+    std::fprintf( stderr, "   (See \"man X\" resp. \"man xhost\" for details)\n");
+    std::fflush( stderr );
+    exit(0);
+
+}
+
+extern "C" {
+static void EmitFontpathWarning()
+{
+    static Bool bOnce = False;
+    if ( !bOnce )
+    {
+        bOnce = True;
+        std::fprintf( stderr, "Please verify your fontpath settings\n"
+                "\t(See \"man xset\" for details"
+                " or ask your system administrator)\n" );
+    }
+}
+
+} /* extern "C" */
+
+static void PrintXError( Display *pDisplay, XErrorEvent *pEvent )
+{
+    char msg[ 120 ] = "";
+    XGetErrorText( pDisplay, pEvent->error_code, msg, sizeof( msg ) );
+    std::fprintf( stderr, "X-Error: %s\n", msg );
+    if( pEvent->request_code < SAL_N_ELEMENTS( XRequest ) )
+    {
+        const char* pName = XRequest[pEvent->request_code];
+        if( !pName )
+            pName = "BadRequest?";
+        std::fprintf( stderr, "\tMajor opcode: %d (%s)\n", pEvent->request_code, pName );
+    }
+    else
+    {
+        std::fprintf( stderr, "\tMajor opcode: %d\n", pEvent->request_code );
+        // TODO: also display extension name?
+        std::fprintf( stderr, "\tMinor opcode: %d\n", pEvent->minor_code );
+    }
+
+    std::fprintf( stderr, "\tResource ID:  0x%lx\n",
+             pEvent->resourceid );
+    std::fprintf( stderr, "\tSerial No:    %ld (%ld)\n",
+             pEvent->serial, LastKnownRequestProcessed(pDisplay) );
+
+    if( !getenv( "SAL_SYNCHRONIZE" ) )
+    {
+        std::fprintf( stderr, "These errors are reported asynchronously,\n");
+        std::fprintf( stderr, "set environment variable SAL_SYNCHRONIZE to 1 to help debugging\n");
+    }
+
+    std::fflush( stdout );
+    std::fflush( stderr );
+}
+
+void X11SalData::XError( Display *pDisplay, XErrorEvent *pEvent )
+{
+    if( ! m_aXErrorHandlerStack.back().m_bIgnore )
+    {
+        if (   (pEvent->error_code   == BadAlloc)
+            && (pEvent->request_code == X_OpenFont) )
+        {
+            static Bool bOnce = False;
+            if ( !bOnce )
+            {
+                std::fprintf(stderr, "X-Error occurred in a request for X_OpenFont\n");
+                EmitFontpathWarning();
+
+                bOnce = True ;
+            }
+            return;
+        }
+        /* ignore
+        * X_SetInputFocus: it's a hint only anyway
+        * X_GetProperty: this is part of the XGetWindowProperty call and will
+        *                be handled by the return value of that function
+        */
+        else if( pEvent->request_code == X_SetInputFocus ||
+                 pEvent->request_code == X_GetProperty
+            )
+            return;
+
+        if( pDisplay != vcl_sal::getSalDisplay(GetGenericUnixSalData())->GetDisplay() )
+            return;
+
+        PrintXError( pDisplay, pEvent );
+
+        oslSignalAction eToDo = osl_raiseSignal (OSL_SIGNAL_USER_X11SUBSYSTEMERROR, nullptr);
+        switch (eToDo)
+        {
+            case osl_Signal_ActIgnore       :
+                return;
+            case osl_Signal_ActAbortApp     :
+                abort();
+            case osl_Signal_ActKillApp      :
+                exit(0);
+            case osl_Signal_ActCallNextHdl  :
+                break;
+            default :
+                break;
+        }
+
+    }
+
+    m_aXErrorHandlerStack.back().m_bWas = true;
+}
+
+void X11SalData::Timeout()
+{
+    ImplSVData* pSVData = ImplGetSVData();
+    if( pSVData->maSchedCtx.mpSalTimer )
+        pSVData->maSchedCtx.mpSalTimer->CallCallback();
+}
+
+namespace {
+
+struct YieldEntry
+{
+    int         fd;         // file descriptor for reading
+    void*           data;       // data for predicate and callback
+    YieldFunc       pending;    // predicate (determines pending events)
+    YieldFunc       queued;     // read and queue up events
+    YieldFunc       handle;     // handle pending events
+
+    int  HasPendingEvent()   const { return pending( fd, data ); }
+    int  IsEventQueued()     const { return queued( fd, data ); }
+    void HandleNextEvent()   const { handle( fd, data ); }
+};
+
+}
+
+#define MAX_NUM_DESCRIPTORS 128
+
+static YieldEntry yieldTable[ MAX_NUM_DESCRIPTORS ];
+
+void SalXLib::Insert( int nFD, void* data,
+                      YieldFunc     pending,
+                      YieldFunc     queued,
+                      YieldFunc     handle )
+{
+    SAL_WARN_IF( !nFD, "vcl", "can not insert stdin descriptor" );
+    SAL_WARN_IF( yieldTable[nFD].fd, "vcl", "SalXLib::Insert fd twice" );
+
+    yieldTable[nFD].fd      = nFD;
+    yieldTable[nFD].data    = data;
+    yieldTable[nFD].pending = pending;
+    yieldTable[nFD].queued  = queued;
+    yieldTable[nFD].handle  = handle;
+
+    FD_SET( nFD, &aReadFDS_ );
+    FD_SET( nFD, &aExceptionFDS_ );
+
+    if( nFD >= nFDs_ )
+        nFDs_ = nFD + 1;
+}
+
+void SalXLib::Remove( int nFD )
+{
+    FD_CLR( nFD, &aReadFDS_ );
+    FD_CLR( nFD, &aExceptionFDS_ );
+
+    yieldTable[nFD].fd = 0;
+
+    if ( nFD == nFDs_ )
+    {
+        for ( nFD = nFDs_ - 1;
+              nFD >= 0 && !yieldTable[nFD].fd;
+              nFD-- ) ;
+
+        nFDs_ = nFD + 1;
+    }
+}
+
+bool SalXLib::CheckTimeout( bool bExecuteTimers )
+{
+    bool bRet = false;
+    if( m_aTimeout.tv_sec ) // timer is started
+    {
+        timeval aTimeOfDay;
+        gettimeofday( &aTimeOfDay, nullptr );
+        if( aTimeOfDay >= m_aTimeout )
+        {
+            bRet = true;
+            if( bExecuteTimers )
+            {
+                // timed out, update timeout
+                m_aTimeout = aTimeOfDay;
+                /*
+                *  #107827# autorestart immediately, will be stopped (or set
+                *  to different value in notify hdl if necessary;
+                *  CheckTimeout should return false while
+                *  timers are being dispatched.
+                */
+                m_aTimeout += m_nTimeoutMS;
+                // notify
+                X11SalData::Timeout();
+            }
+        }
+    }
+    return bRet;
+}
+
+bool
+SalXLib::Yield( bool bWait, bool bHandleAllCurrentEvents )
+{
+    // check for timeouts here if you want to make screenshots
+    static char* p_prioritize_timer = getenv ("SAL_HIGHPRIORITY_REPAINT");
+    bool bHandledEvent = false;
+    if (p_prioritize_timer != nullptr)
+        bHandledEvent = CheckTimeout();
+
+    const int nMaxEvents = bHandleAllCurrentEvents ? 100 : 1;
+
+    // first, check for already queued events.
+    for ( int nFD = 0; nFD < nFDs_; nFD++ )
+    {
+        YieldEntry* pEntry = &(yieldTable[nFD]);
+        if ( pEntry->fd )
+        {
+            SAL_WARN_IF( nFD != pEntry->fd, "vcl", "wrong fd in Yield()" );
+            for( int i = 0; i < nMaxEvents && pEntry->HasPendingEvent(); i++ )
+            {
+                pEntry->HandleNextEvent();
+                if( ! bHandleAllCurrentEvents )
+                {
+                    return true;
+                }
+            }
+        }
+    }
+
+    // next, select with or without timeout according to bWait.
+    int      nFDs         = nFDs_;
+    fd_set   ReadFDS      = aReadFDS_;
+    fd_set   ExceptionFDS = aExceptionFDS_;
+    int      nFound       = 0;
+
+    timeval  Timeout      = noyield_;
+    timeval *pTimeout     = &Timeout;
+
+
+    if (bWait)
+    {
+        pTimeout = nullptr;
+        if (m_aTimeout.tv_sec) // Timer is started.
+        {
+            // determine remaining timeout.
+            gettimeofday (&Timeout, nullptr);
+            Timeout = m_aTimeout - Timeout;
+            if (yield_ >= Timeout)
+            {
+                // guard against micro timeout.
+                Timeout = yield_;
+            }
+            pTimeout = &Timeout;
+        }
+    }
+
+    {
+        // release YieldMutex (and re-acquire at block end)
+        SolarMutexReleaser aReleaser;
+        nFound = select( nFDs, &ReadFDS, nullptr, &ExceptionFDS, pTimeout );
+    }
+    if( nFound < 0 ) // error
+    {
+#ifdef DBG_UTIL
+        SAL_INFO("vcl.app", "SalXLib::Yield e=" << errno << " f=" << nFound);
+#endif
+        if( EINTR == errno )
+        {
+            errno = 0;
+        }
+    }
+
+    // usually handle timeouts here (as in 5.2)
+    if (p_prioritize_timer == nullptr)
+        bHandledEvent = CheckTimeout() || bHandledEvent;
+
+    // handle wakeup events.
+    if ((nFound > 0) && FD_ISSET(m_pTimeoutFDS[0], &ReadFDS))
+    {
+        int buffer;
+        while (read (m_pTimeoutFDS[0], &buffer, sizeof(buffer)) > 0)
+            continue;
+        nFound -= 1;
+    }
+
+    // handle other events.
+    if( nFound > 0 )
+    {
+        // now we are in the protected section !
+        // recall select if we have acquired fd's, ready for reading,
+
+        struct timeval noTimeout = { 0, 0 };
+        nFound = select( nFDs_, &ReadFDS, nullptr,
+                         &ExceptionFDS, &noTimeout );
+
+        // someone-else has done the job for us
+        if (nFound == 0)
+        {
+            return false;
+        }
+
+        for ( int nFD = 0; nFD < nFDs_; nFD++ )
+        {
+            YieldEntry* pEntry = &(yieldTable[nFD]);
+            if ( pEntry->fd )
+            {
+                if ( FD_ISSET( nFD, &ExceptionFDS ) ) {
+#if OSL_DEBUG_LEVEL > 1
+                    SAL_WARN("vcl.app", "SalXLib::Yield exception.");
+#endif
+                    nFound--;
+                }
+                if ( FD_ISSET( nFD, &ReadFDS ) )
+                {
+                    for( int i = 0; pEntry->IsEventQueued() && i < nMaxEvents; i++ )
+                    {
+                        pEntry->HandleNextEvent();
+                        bHandledEvent = true;
+                        // if a recursive call has done the job
+                        // so abort here
+                    }
+                    nFound--;
+                }
+            }
+        }
+    }
+
+    return bHandledEvent;
+}
+
+void SalXLib::Wakeup()
+{
+    OSL_VERIFY(write (m_pTimeoutFDS[1], "", 1) == 1);
+}
+
+void SalXLib::TriggerUserEventProcessing()
+{
+    Wakeup();
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */