// Copyright (c) 2007-2009 Nokia Corporation and/or its subsidiary(-ies).

// All rights reserved.

// This component and the accompanying materials are made available

// under the terms of "Eclipse Public License v1.0"

// which accompanies this distribution, and is available

// at the URL "http://www.eclipse.org/legal/epl-v10.html".

//

// Initial Contributors:

// Nokia Corporation - initial contribution.

//

// Contributors:

//

// Description:

// For the Winscw Emulator only, selects between NGA and Non-NGA version of wsgraphicdrawer.

// The default is the non-GCE based version.

// To select the NGA version do one of:

// 1. Add a line to the epoc.ini file in \epoc32\data like this:

// symbian_graphics_use_gce ON

// or

// 2. Start epoc.exe with these parameters, (the "--" IS necessary):

// -Dsymbian_graphics_use_gce=ON --

// or

// 3. epoc.exe can be told to switch to a different initialisation file than epoc.ini, with the -M parameter.

// Progress chaining to the real Wserv is logged in epocwind.out.

// 

//

#include <e32svr.h>

#include <u32hal.h>

_LIT(KProcessName, "WservSwitch");

TInt ChainWservSwitch()

	{

	_LIT(KWservSwitchNga,"z:\\sys\\bin\\wserv_nga.exe");

	_LIT(KWservSwitchNonNga,"z:\\sys\\bin\\wserv_nonnga.exe");

	// need to forward the command parameters to the chained version of Wserv

	TInt argLen = User::CommandLineLength();

	HBufC* arg = HBufC::New(argLen);

	if (arg == NULL)

		{

		return KErrNoMemory;

		}

	TPtr argPtr = arg->Des();

	User::CommandLine(argPtr);

	// NGA or Non-NGA WServ version?

	TBool nga = EFalse;

	UserSvr::HalFunction(EHalGroupEmulator, EEmulatorHalBoolProperty,  (TAny*)"symbian_graphics_use_gce",  &nga);

	// try to launch it

	const TPtrC exeName = nga ?  KWservSwitchNga() : KWservSwitchNonNga();

#ifdef _DEBUG

	RDebug::Print(_L("%S: Starting \"%S\" \"%S\""), &KProcessName, &exeName, &argPtr);

#endif

	RProcess server;

	TInt err = server.Create(exeName, argPtr, EOwnerThread);

	delete arg;

	arg = NULL;

	if (err)

		{

		return err;

		}

	// wait for server to start

#ifdef _DEBUG

	RDebug::Print(_L("%S: waiting on process ..."), &KProcessName);

#endif

	TRequestStatus stat;

	server.Rendezvous(stat);

	if (stat!=KRequestPending)

		{ // abort startup

		server.Kill(0);

		}

	else

		{ // logon OK - start the server

		server.Resume();

		}

	User::WaitForRequest(stat);

	return (server.ExitType() == EExitPanic) ? KErrGeneral : stat.Int();

	}

TInt E32Main()

	{

	TInt error = ChainWservSwitch();

	// propagate error to SysStart

	if (error)

		{

#ifdef _DEBUG

		RDebug::Print(_L("%S: Failed with error %i"), &KProcessName, error);

#endif

		}

	RProcess::Rendezvous(error);

	return error;

	}