/**************************************************************
 * 
 * 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
 * 
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 * 
 *************************************************************/


// MARKER(update_precomp.py): autogen include statement, do not remove
#include "precompiled_vcl.hxx"
#include <string.h>
#include <unistd.h>
#include <sys/poll.h>
#include <fcntl.h>

#include <stdio.h>

#include <osl/process.h>
#include <osl/security.h>
#include <osl/conditn.h>

#include <tools/prex.h>
#include <X11/Xatom.h>
#include <tools/postx.h>

#include <unx/sm.hxx>
#include <unx/saldata.hxx>
#include <unx/saldisp.hxx>
#include <unx/salframe.h>
#include <unx/salinst.h>

#include <vcl/svapp.hxx>
#include <vcl/window.hxx>

#define USE_SM_EXTENSION

#if OSL_DEBUG_LEVEL > 1
#include <cstdarg>
static bool bFirstAssert = true;
#endif

#if OSL_DEBUG_LEVEL > 1
inline void SMprintf( const char* pFormat, ... )
#else
inline void SMprintf( const char*, ... )
#endif
{
#if OSL_DEBUG_LEVEL > 1
    FILE* fp = fopen( "/tmp/sessionlog.txt", bFirstAssert ? "w" : "a" );
    if(!fp) return;
    bFirstAssert = false;
    std::va_list ap;
    va_start( ap, pFormat );
    vfprintf( fp, pFormat, ap );
    fclose( fp );
    va_end( ap );
#endif
};

static IceSalSession* pOneInstance = NULL;

SalSession* X11SalInstance::CreateSalSession()
{
    if( ! pOneInstance )
        pOneInstance = new IceSalSession();
    return pOneInstance;
}

/*
 *  class IceSalSession
 */

static X11SalFrame* pOldStyleSaveFrame = NULL;

IceSalSession::IceSalSession()
{
}

IceSalSession::~IceSalSession()
{
    if( pOneInstance == this )
        pOneInstance = NULL;
}

void IceSalSession::queryInteraction()
{
    if( ! SessionManagerClient::queryInteraction() )
    {
        SalSessionInteractionEvent aEvent( false );
        CallCallback( &aEvent );
    }
}

void IceSalSession::interactionDone()
{
    SessionManagerClient::interactionDone( false );
}

void IceSalSession::saveDone()
{
    SessionManagerClient::saveDone();
    if( pOldStyleSaveFrame )
    {
        // note: does nothing if not running in generic plugin
        X11SalFrame::SaveYourselfDone( pOldStyleSaveFrame );
    }
}

bool IceSalSession::cancelShutdown()
{
    SessionManagerClient::interactionDone( true );
    return false;
}

void IceSalSession::handleOldX11SaveYourself( SalFrame* pFrame )
{
    // do this only once
    if( ! pOldStyleSaveFrame )
    {
        pOldStyleSaveFrame = static_cast<X11SalFrame*>(pFrame);
        if( pOneInstance )
        {
            SalSessionSaveRequestEvent aEvent( true, false );
            pOneInstance->CallCallback( &aEvent );        
        }
    }
}

extern "C" void SAL_CALL ICEConnectionWorker( void* );

class ICEConnectionObserver
{
    friend void SAL_CALL ICEConnectionWorker(void*);
	static sal_Bool bIsWatching;
	static void ICEWatchProc( IceConn connection, IcePointer client_data,
							  Bool opening, IcePointer* watch_data );

    static struct pollfd* pFilehandles;
    static IceConn* pConnections;
    static int nConnections;
    static int nWakeupFiles[2];
    static oslMutex ICEMutex;
    static oslThread ICEThread;
#ifdef USE_SM_EXTENSION
    static IceIOErrorHandler origIOErrorHandler;
    static IceErrorHandler origErrorHandler;
#endif
public:

	static void activate();
    static void deactivate();
    static void lock();
    static void unlock();
    static void wakeup();
};


SmcConn				SessionManagerClient::aSmcConnection			= NULL;
ByteString			SessionManagerClient::aClientID;
sal_Bool				ICEConnectionObserver::bIsWatching				= sal_False;
struct pollfd* 	ICEConnectionObserver::pFilehandles				= NULL;
IceConn*			ICEConnectionObserver::pConnections				= NULL;
int					ICEConnectionObserver::nConnections				= 0;
oslMutex			ICEConnectionObserver::ICEMutex					= NULL;
oslThread			ICEConnectionObserver::ICEThread				= NULL;
int					ICEConnectionObserver::nWakeupFiles[2]			= { 0, 0 };

#ifdef USE_SM_EXTENSION
IceIOErrorHandler ICEConnectionObserver::origIOErrorHandler = NULL;
IceErrorHandler ICEConnectionObserver::origErrorHandler = NULL;

static void IgnoreIceErrors(IceConn, Bool, int, unsigned long, int, int, IcePointer)
{
}

static void IgnoreIceIOErrors(IceConn)
{
}
#endif

// HACK
bool SessionManagerClient::bDocSaveDone = false;


static SmProp*	pSmProps = NULL;
static SmProp**	ppSmProps = NULL;
static int		nSmProps = 0;
static unsigned char   *pSmRestartHint = NULL;


static void BuildSmPropertyList()
{
	if( ! pSmProps )
	{
		ByteString aExec( SessionManagerClient::getExecName(), osl_getThreadTextEncoding() );

		nSmProps = 5;
		pSmProps = new SmProp[ nSmProps ];

		pSmProps[ 0 ].name		= const_cast<char*>(SmCloneCommand);
		pSmProps[ 0 ].type		= const_cast<char*>(SmLISTofARRAY8);
		pSmProps[ 0 ].num_vals	= 1;
		pSmProps[ 0 ].vals		= new SmPropValue;
		pSmProps[ 0 ].vals->length	= aExec.Len()+1;
		pSmProps[ 0 ].vals->value	= strdup( aExec.GetBuffer() );

		pSmProps[ 1 ].name		= const_cast<char*>(SmProgram);
		pSmProps[ 1 ].type		= const_cast<char*>(SmARRAY8);
		pSmProps[ 1 ].num_vals	= 1;
		pSmProps[ 1 ].vals		= new SmPropValue;
		pSmProps[ 1 ].vals->length	= aExec.Len()+1;
		pSmProps[ 1 ].vals->value	= strdup( aExec.GetBuffer() );

		pSmProps[ 2 ].name		= const_cast<char*>(SmRestartCommand);
		pSmProps[ 2 ].type		= const_cast<char*>(SmLISTofARRAY8);
		pSmProps[ 2 ].num_vals	= 3;
		pSmProps[ 2 ].vals		= new SmPropValue[3];
		pSmProps[ 2 ].vals[0].length	= aExec.Len()+1;
		pSmProps[ 2 ].vals[0].value	= strdup( aExec.GetBuffer() );
        	ByteString aRestartOption( "-session=" );
		aRestartOption.Append( SessionManagerClient::getSessionID() );
		pSmProps[ 2 ].vals[1].length	= aRestartOption.Len()+1;
		pSmProps[ 2 ].vals[1].value	= strdup( aRestartOption.GetBuffer() );
        	ByteString aRestartOptionNoLogo( "-nologo" );
		pSmProps[ 2 ].vals[2].length	= aRestartOptionNoLogo.Len()+1;
		pSmProps[ 2 ].vals[2].value	= strdup( aRestartOptionNoLogo.GetBuffer() );

		rtl::OUString aUserName;
        rtl::OString aUser;
        oslSecurity aSec = osl_getCurrentSecurity();
        if( aSec )
        {
            osl_getUserName( aSec, &aUserName.pData );
            aUser = rtl::OUStringToOString( aUserName, osl_getThreadTextEncoding() );
            osl_freeSecurityHandle( aSec );
        }

		pSmProps[ 3 ].name		= const_cast<char*>(SmUserID);
		pSmProps[ 3 ].type		= const_cast<char*>(SmARRAY8);
		pSmProps[ 3 ].num_vals	= 1;
		pSmProps[ 3 ].vals		= new SmPropValue;
		pSmProps[ 3 ].vals->value	= strdup( aUser.getStr() );
		pSmProps[ 3 ].vals->length	= strlen( (char *)pSmProps[ 3 ].vals->value )+1;

		pSmProps[ 4 ].name		= const_cast<char*>(SmRestartStyleHint);
		pSmProps[ 4 ].type		= const_cast<char*>(SmCARD8);
		pSmProps[ 4 ].num_vals	= 1;
		pSmProps[ 4 ].vals		= new SmPropValue;
		pSmProps[ 4 ].vals->value	= malloc(1);
		pSmRestartHint = (unsigned char *)pSmProps[ 4 ].vals->value;
		*pSmRestartHint = SmRestartIfRunning;
		pSmProps[ 4 ].vals->length	= 1;

		ppSmProps = new SmProp*[ nSmProps ];
		for( int i = 0; i < nSmProps; i++ )
			ppSmProps[ i ] = &pSmProps[i];
	}
}

bool SessionManagerClient::checkDocumentsSaved()
{
    return bDocSaveDone;
}

IMPL_STATIC_LINK( SessionManagerClient, SaveYourselfHdl, void*, EMPTYARG )
{
    SMprintf( "posting save documents event shutdown = %s\n", (pThis!=0) ? "true" : "false" );

    static bool bFirstShutdown=true;
    if (pThis != 0 && bFirstShutdown) //first shutdown request
    {
        bFirstShutdown = false;
        /*
          If we have no actual frames open, e.g. we launched a quickstarter,
          and then shutdown all our frames leaving just a quickstarter running,
          then we don't want to launch an empty toplevel frame on the next 
          start. (The job of scheduling the restart of the quick-starter is a 
          task of the quick-starter)
        */
        *pSmRestartHint = SmRestartNever;
        const std::list< SalFrame* >& rFrames = GetX11SalData()->GetDisplay()->getFrames();
        for( std::list< SalFrame* >::const_iterator it = rFrames.begin(); it != rFrames.end(); ++it )
        {
            Window *pWindow = (*it)->GetWindow();
            if (pWindow && pWindow->IsVisible())
            {
                *pSmRestartHint = SmRestartIfRunning;
                break;
            }
        }
    }

    if( pOneInstance )
    {
        SalSessionSaveRequestEvent aEvent( pThis != 0, false );
        pOneInstance->CallCallback( &aEvent );        
    }
    else
        saveDone();

    return 0;
}

IMPL_STATIC_LINK_NOINSTANCE( SessionManagerClient, InteractionHdl, void*, EMPTYARG )
{
    SMprintf( "interaction link\n" );
    if( pOneInstance )
    {
        SalSessionInteractionEvent aEvent( true );
        pOneInstance->CallCallback( &aEvent );
    }
    
    return 0;
}

IMPL_STATIC_LINK_NOINSTANCE( SessionManagerClient, ShutDownCancelHdl, void*, EMPTYARG )
{
    SMprintf( "shutdown cancel\n" );
    if( pOneInstance )
    {
        SalSessionShutdownCancelEvent aEvent;
        pOneInstance->CallCallback( &aEvent );
    }
    
    return 0;
}

void SessionManagerClient::SaveYourselfProc(
	SmcConn,
	SmPointer,
	int save_type,
	Bool shutdown,
	int interact_style,
	Bool
	)
{
    SMprintf( "Session: save yourself, save_type = %s, shutdown = %s, interact_style = %s, fast = %s\n",
              save_type == SmSaveLocal ? "SmcSaveLocal" :
              ( save_type == SmSaveGlobal ? "SmcSaveGlobal" :
                ( save_type == SmSaveBoth ? "SmcSaveBoth" : "<unknown>" ) ),
              shutdown ? "true" : "false",
              interact_style == SmInteractStyleNone ? "SmInteractStyleNone" :
              ( interact_style == SmInteractStyleErrors ? "SmInteractStyleErrors" :
                ( interact_style == SmInteractStyleAny ? "SmInteractStyleAny" : "<unknown>" ) ),
              false ? "true" : "false"
              );
	BuildSmPropertyList();
#ifdef USE_SM_EXTENSION
    bDocSaveDone = false;
    /* #i49875# some session managers send a "die" message if the
     * saveDone does not come early enough for their convenience
     * this can occasionally happen on startup, especially the first
     * startup. So shortcut the "not shutting down" case since the
     * upper layers are currently not interested in that event anyway.
     */
    if( ! shutdown )
    {
        SessionManagerClient::saveDone();
        return;
    }
    Application::PostUserEvent( STATIC_LINK( (void*)(shutdown ? 0xffffffff : 0x0), SessionManagerClient, SaveYourselfHdl ) );
    SMprintf( "waiting for save yourself event to be processed\n" );
#endif
}

IMPL_STATIC_LINK_NOINSTANCE( SessionManagerClient, ShutDownHdl, void*, EMPTYARG )
{
    if( pOneInstance )
    {
        SalSessionQuitEvent aEvent;
        pOneInstance->CallCallback( &aEvent );
    }

    const std::list< SalFrame* >& rFrames = GetX11SalData()->GetDisplay()->getFrames();
    SMprintf( rFrames.begin() != rFrames.end() ? "shutdown on first frame\n" : "shutdown event but no frame\n" );
    if( rFrames.begin() != rFrames.end() )
        rFrames.front()->CallCallback( SALEVENT_SHUTDOWN, 0 );
    return 0;
}

void SessionManagerClient::DieProc(
	SmcConn connection,
	SmPointer
	)
{
    SMprintf( "Session: die\n" );
	if( connection == aSmcConnection )
    {
        Application::PostUserEvent( STATIC_LINK( NULL, SessionManagerClient, ShutDownHdl ) );
        SMprintf( "waiting for shutdown event to be processed\n" );
    }
}

void SessionManagerClient::SaveCompleteProc(
	SmcConn,
	SmPointer
	)
{
    SMprintf( "Session: save complete\n" );
}

void SessionManagerClient::ShutdownCanceledProc(
	SmcConn connection,
	SmPointer )
{
    SMprintf( "Session: shutdown canceled\n" );
	if( connection == aSmcConnection )
        Application::PostUserEvent( STATIC_LINK( NULL, SessionManagerClient, ShutDownCancelHdl ) );
}

void SessionManagerClient::InteractProc(
                                        SmcConn connection,
                                        SmPointer )
{
    SMprintf( "Session: interaction request completed\n" );
	if( connection == aSmcConnection )
        Application::PostUserEvent( STATIC_LINK( NULL, SessionManagerClient, InteractionHdl ) );
}

void SessionManagerClient::saveDone()
{
    if( aSmcConnection )
    {
        ICEConnectionObserver::lock();
        SmcSetProperties( aSmcConnection, nSmProps, ppSmProps );
        SmcSaveYourselfDone( aSmcConnection, True );
        SMprintf( "sent SaveYourselfDone SmRestartHint of %d\n", *pSmRestartHint );
        bDocSaveDone = true;
        ICEConnectionObserver::unlock();
    }
}


void SessionManagerClient::open()
{
	static SmcCallbacks aCallbacks;

#ifdef USE_SM_EXTENSION
	// this is the way Xt does it, so we can too
	if( ! aSmcConnection && getenv( "SESSION_MANAGER" ) )
	{
		char aErrBuf[1024];
		ICEConnectionObserver::activate();
        ICEConnectionObserver::lock();

        char* pClientID = NULL;
        const ByteString& rPrevId( getPreviousSessionID() );

		aCallbacks.save_yourself.callback			= SaveYourselfProc;
		aCallbacks.save_yourself.client_data		= NULL;
		aCallbacks.die.callback						= DieProc;
		aCallbacks.die.client_data					= NULL;
		aCallbacks.save_complete.callback			= SaveCompleteProc;
		aCallbacks.save_complete.client_data		= NULL;
		aCallbacks.shutdown_cancelled.callback		= ShutdownCanceledProc;
		aCallbacks.shutdown_cancelled.client_data	= NULL;
		aSmcConnection = SmcOpenConnection( NULL,
											NULL,
											SmProtoMajor,
											SmProtoMinor,
											SmcSaveYourselfProcMask			|
											SmcDieProcMask					|
											SmcSaveCompleteProcMask			|
											SmcShutdownCancelledProcMask	,
											&aCallbacks,
											rPrevId.Len() ? const_cast<char*>(rPrevId.GetBuffer()) : NULL,
											&pClientID,
											sizeof( aErrBuf ),
											aErrBuf );
		if( ! aSmcConnection )
			SMprintf( "SmcOpenConnection failed: %s\n", aErrBuf );
        else
            SMprintf( "SmcOpenConnection succeeded, client ID is \"%s\"\n", pClientID );
        aClientID = ByteString( pClientID );
        free( pClientID );
        pClientID = NULL;
        ICEConnectionObserver::unlock();

        SalDisplay* pDisp = GetX11SalData()->GetDisplay();
        if( pDisp->GetDrawable( pDisp->GetDefaultScreenNumber() ) && aClientID.Len() )
        {
            XChangeProperty( pDisp->GetDisplay(),
                             pDisp->GetDrawable( pDisp->GetDefaultScreenNumber() ),
                             XInternAtom( pDisp->GetDisplay(), "SM_CLIENT_ID", False ),
                             XA_STRING,
                             8,
                             PropModeReplace,
                             (unsigned char*)aClientID.GetBuffer(),
                             aClientID.Len()
                             );
        }
	}
    else if( ! aSmcConnection )
        SMprintf( "no SESSION_MANAGER\n" );
#endif
}

const ByteString& SessionManagerClient::getSessionID()
{
    return aClientID;
}

void SessionManagerClient::close()
{
	if( aSmcConnection )
	{
#ifdef USE_SM_EXTENSION
        ICEConnectionObserver::lock();
        SMprintf( "attempting SmcCloseConnection\n" );
		SmcCloseConnection( aSmcConnection, 0, NULL );
        SMprintf( "SmcConnection closed\n" );
        ICEConnectionObserver::unlock();
        ICEConnectionObserver::deactivate();
#endif
		aSmcConnection = NULL;
	}
}

bool SessionManagerClient::queryInteraction()
{
    bool bRet = false;
    if( aSmcConnection )
    {
        ICEConnectionObserver::lock();
        if( SmcInteractRequest( aSmcConnection, SmDialogNormal, InteractProc, NULL ) )
            bRet = true;
        ICEConnectionObserver::unlock();
    }
    return bRet;
}

void SessionManagerClient::interactionDone( bool bCancelShutdown )
{
    if( aSmcConnection )
    {
        ICEConnectionObserver::lock();
        SmcInteractDone( aSmcConnection, bCancelShutdown ? True : False );
        ICEConnectionObserver::unlock();
    }
}


String SessionManagerClient::getExecName()
{
	rtl::OUString aExec, aSysExec;
	osl_getExecutableFile( &aExec.pData );
    osl_getSystemPathFromFileURL( aExec.pData, &aSysExec.pData );
	
	int nPos = aSysExec.indexOf( rtl::OUString::createFromAscii( ".bin" ) );
	if( nPos != -1 )
		aSysExec = aSysExec.copy( 0, nPos );
	return aSysExec;
}


const ByteString& SessionManagerClient::getPreviousSessionID()
{
	static ByteString aPrevId;

    int nCommands = osl_getCommandArgCount();
    for( int i = 0; i < nCommands; i++ )
    {
        ::rtl::OUString aArg;
        osl_getCommandArg( i, &aArg.pData );
        if( aArg.compareToAscii( "-session=", 9 ) == 0 )
        {
            aPrevId = ByteString( ::rtl::OUStringToOString( aArg.copy( 9 ), osl_getThreadTextEncoding() ) );
            break;
        }
    }
    SMprintf( "previous ID = \"%s\"\n", aPrevId.GetBuffer() );
    return aPrevId;
}

void ICEConnectionObserver::lock()
{
    osl_acquireMutex( ICEMutex );
}

void ICEConnectionObserver::unlock()
{
    osl_releaseMutex( ICEMutex );
}

void ICEConnectionObserver::activate()
{
    if( ! bIsWatching )
    {
        nWakeupFiles[0] = nWakeupFiles[1] = 0;
        ICEMutex = osl_createMutex();
        bIsWatching = sal_True;
#ifdef USE_SM_EXTENSION
        /*
         * Default handlers call exit, we don't care that strongly if something
         * happens to fail
         */
        origIOErrorHandler = IceSetIOErrorHandler( IgnoreIceIOErrors );
        origErrorHandler = IceSetErrorHandler( IgnoreIceErrors );
        IceAddConnectionWatch( ICEWatchProc, NULL );
#endif
    }
}

void ICEConnectionObserver::deactivate()
{
    if( bIsWatching )
    {
        lock();
        bIsWatching = sal_False;
#ifdef USE_SM_EXTENSION
        IceRemoveConnectionWatch( ICEWatchProc, NULL );
        IceSetErrorHandler( origErrorHandler );
        IceSetIOErrorHandler( origIOErrorHandler );
#endif
        nConnections = 0;
        if( ICEThread )
        {
            osl_terminateThread( ICEThread );
            wakeup();
        }
        unlock();
        if( ICEThread )
        {
            osl_joinWithThread( ICEThread );
            osl_destroyThread( ICEThread );
            close( nWakeupFiles[1] );
            close( nWakeupFiles[0] );
            ICEThread = NULL;
        }
        osl_destroyMutex( ICEMutex );
        ICEMutex = NULL;
    }
}

void ICEConnectionObserver::wakeup()
{
    char cChar = 'w';
    write( nWakeupFiles[1], &cChar, 1 );
}

void ICEConnectionWorker( void* )
{
#ifdef USE_SM_EXTENSION
    while( osl_scheduleThread(ICEConnectionObserver::ICEThread) && ICEConnectionObserver::nConnections )
    {
        ICEConnectionObserver::lock();
        int nConnectionsBefore = ICEConnectionObserver::nConnections;
        int nBytes = sizeof( struct pollfd )*(nConnectionsBefore+1);
        struct pollfd* pLocalFD = (struct pollfd*)rtl_allocateMemory( nBytes );
        rtl_copyMemory( pLocalFD, ICEConnectionObserver::pFilehandles, nBytes );
        ICEConnectionObserver::unlock();

        int nRet = poll( pLocalFD,nConnectionsBefore+1,-1 );
        bool bWakeup = (pLocalFD[0].revents & POLLIN);
        rtl_freeMemory( pLocalFD );

        if( nRet < 1 )
            continue;

        // clear wakeup pipe
        if( bWakeup )
        {
            char buf[4];
            while( read( ICEConnectionObserver::nWakeupFiles[0], buf, sizeof( buf ) ) > 0 )
                ;
            SMprintf( "file handles active in wakeup: %d\n", nRet );
            if( nRet == 1 )
                continue;
        }

        // check fd's after we obtained the lock
        ICEConnectionObserver::lock();
        if( ICEConnectionObserver::nConnections > 0 && ICEConnectionObserver::nConnections == nConnectionsBefore )
        {
            nRet = poll( ICEConnectionObserver::pFilehandles+1, ICEConnectionObserver::nConnections, 0 );
            if( nRet > 0 )
            {
                SMprintf( "IceProcessMessages\n" );
                Bool bReply;
                for( int i = 0; i < ICEConnectionObserver::nConnections; i++ )
                    if( ICEConnectionObserver::pFilehandles[i+1].revents & POLLIN )
                        IceProcessMessages( ICEConnectionObserver::pConnections[i], NULL, &bReply );
            }
        }
        ICEConnectionObserver::unlock();
    }
#endif
    SMprintf( "shutting donw ICE dispatch thread\n" );
}

void ICEConnectionObserver::ICEWatchProc(
	IceConn connection,
	IcePointer,
	Bool opening,
	IcePointer*
	)
{
    // note: this is a callback function for ICE
    // this implicitly means that a call into ICE lib is calling this
    // so the ICEMutex MUST already be locked by the caller

#ifdef USE_SM_EXTENSION
    if( opening )
    {
        int fd = IceConnectionNumber( connection );
        nConnections++;
        pConnections = (IceConn*)rtl_reallocateMemory( pConnections, sizeof( IceConn )*nConnections );
        pFilehandles = (struct pollfd*)rtl_reallocateMemory( pFilehandles, sizeof( struct pollfd )*(nConnections+1) );
        pConnections[ nConnections-1 ]		= connection;
        pFilehandles[ nConnections ].fd		= fd;
        pFilehandles[ nConnections ].events	= POLLIN;
        if( nConnections == 1 )
        {
            if( ! pipe( nWakeupFiles ) )
            {
                int flags;
                pFilehandles[0].fd		= nWakeupFiles[0];
                pFilehandles[0].events	= POLLIN;
                // set close-on-exec and nonblock descriptor flag.
                if ((flags = fcntl (nWakeupFiles[0], F_GETFD)) != -1)
                {
                    flags |= FD_CLOEXEC;
                    fcntl (nWakeupFiles[0], F_SETFD, flags);
                }
                if ((flags = fcntl (nWakeupFiles[0], F_GETFL)) != -1)
                {
                    flags |= O_NONBLOCK;
                    fcntl (nWakeupFiles[0], F_SETFL, flags);
                }
                // set close-on-exec and nonblock descriptor flag.
                if ((flags = fcntl (nWakeupFiles[1], F_GETFD)) != -1)
                {
                    flags |= FD_CLOEXEC;
                    fcntl (nWakeupFiles[1], F_SETFD, flags);
                }
                if ((flags = fcntl (nWakeupFiles[1], F_GETFL)) != -1)
                {
                    flags |= O_NONBLOCK;
                    fcntl (nWakeupFiles[1], F_SETFL, flags);
                }
                ICEThread = osl_createSuspendedThread( ICEConnectionWorker, NULL );
                osl_resumeThread( ICEThread );
            }
        }
    }
    else
    {
        for( int i = 0; i < nConnections; i++ )
        {
            if( pConnections[i] == connection )
            {
                if( i < nConnections-1 )
                {
                    rtl_moveMemory( pConnections+i, pConnections+i+1, sizeof( IceConn )*(nConnections-i-1) );
                    rtl_moveMemory( pFilehandles+i+1, pFilehandles+i+2, sizeof( struct pollfd )*(nConnections-i-1) );
                }
                nConnections--;
                pConnections = (IceConn*)rtl_reallocateMemory( pConnections, sizeof( IceConn )*nConnections );
                pFilehandles = (struct pollfd*)rtl_reallocateMemory( pFilehandles, sizeof( struct pollfd )*(nConnections+1) );
                break;
            }
        }
        if( nConnections == 0 && ICEThread )
        {
            SMprintf( "terminating ICEThread\n" );
            osl_terminateThread( ICEThread );
            wakeup();
            // must release the mutex here
            osl_releaseMutex( ICEMutex );
            osl_joinWithThread( ICEThread );
            osl_destroyThread( ICEThread );
            close( nWakeupFiles[1] );
            close( nWakeupFiles[0] );
            ICEThread = NULL;
        }
    }
    SMprintf( "ICE connection on %d %s\n",
              IceConnectionNumber( connection ),
              opening ? "inserted" : "removed" );
    SMprintf( "Display connection is %d\n", ConnectionNumber( GetX11SalData()->GetDisplay()->GetDisplay() ) );
#endif
}