/*

* Copyright (c) 2009-2010 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:

* Launches the Connection Method Manager Server.

*

*/

#include "cmmclistatic.h"

/**

 * LaunchServer

 *

 * Launches the CmManager server.

 *

 * Return KErrNone if CmManager server is launched successfully,

 * otherwise one of the system wide error codes.

 */

TInt TCmManagerLauncher::LaunchServer(

        const TDesC& aServerFileName,

        const TUid& aServerUid3 )

    {

    RMutex mutex;

    TInt err( KErrNone );

    const TUidType serverUid( KNullUid, KNullUid, aServerUid3 );

    //

    // EPOC and EKA2 is easy, we just create a new server process. Simultaneous

    // launching of two such processes should be detected when the second one

    // attempts to create the server object, failing with KErrAlreadyExists.

    //

    // Try obtaining a lock. If that fails, server has already been started.

    // If something fails with obtaining the lock, propagate the error to user.

    if ( !ServerStartupLock( mutex, err ) )

        {

        ServerStartupUnlock( mutex );

        return err;

        }

    RProcess server;

    err = server.Create( aServerFileName, KNullDesC, serverUid );

    if ( err != KErrNone )

        {

        ServerStartupUnlock( mutex );

        return err;

        }

    TRequestStatus stat;

    server.Rendezvous( stat );

    if ( stat != KRequestPending )

        {

        server.Kill( 0 ); // Abort startup.

        }

    else

        {

        server.Resume(); // Logon OK - start the server.

        }

    User::WaitForRequest( stat ); // Wait for start or death.

    // We can't use the 'exit reason' if the server panicked as this

    // is the panic 'reason' and may be '0' which cannot be distinguished

    // from KErrNone.

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

    server.Close();

    ServerStartupUnlock( mutex );

    return err;

    }

/**

 * ServerStartupLock

 *

 * Returns true if obtains the lock without waiting. That is, the

 * mutex is not created before this call.

 *

 * Return false if mutex is created.

 */

TBool TCmManagerLauncher::ServerStartupLock( RMutex& mutex, TInt& err )

    {

    TInt retval( ETrue );

    // Create handle to mutex.

    err = mutex.CreateGlobal( KCmManagerStartupMutex );

    if ( err != KErrNone )

        {

        // Mutex already created, wait until done.

        retval = EFalse;

        err = mutex.OpenGlobal( KCmManagerStartupMutex );

        if ( err == KErrNone )

            {

            // Wait for completion

            mutex.Wait();

            // Server already running, return.

            return EFalse;

            }

        // Else opening failed, err will be propagated to user.

        }

    // Else Obtained lock without waiting (retval is ETrue).

    // The next call completes instantly.

    mutex.Wait();

    return retval;

    }

/**

 * ServerStartupUnlock

 *

 * Frees and closes the mutex.

 */

void TCmManagerLauncher::ServerStartupUnlock( RMutex& mutex )

    {

    // Let others run

    mutex.Signal();

    // Destroy handle

    mutex.Close();

    }

// End of file