1 /*

     2 * Copyright (c) 2008 Nokia Corporation and/or its subsidiary(-ies). 

     3 * All rights reserved.

     4 * This component and the accompanying materials are made available

     5 * under the terms of "Eclipse Public License v1.0"

     6 * which accompanies this distribution, and is available

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

     8 *

     9 * Initial Contributors:

    10 * Nokia Corporation - initial contribution.

    11 *

    12 * Contributors:

    13 *

    14 * Description:  Client for Events Handler Server

    15 *

    16 */

    17 

    18 

    19 #include "evthandlerclientserver.h"

    20 #include "evthandlerclient.h"

    21 #include "evthandlerserverconsts.h"

    22 #include "evtdebug.h"

    23 

    24 // ----------------------------------------------------------------------------

    25 // StartServer()

    26 // ----------------------------------------------------------------------------

    27 //

    28 static TInt StartServer()

    29 /*

    30  * Start the server process. Simultaneous launching

    31  * of two such processes should be detected when the second one attempts to

    32  * create the server object, failing with KErrAlreadyExists.

    33  */

    34 	{

    35 	EVTUIDEBUG("+ StartServer()");

    36 	const TUidType serverUid( KNullUid, KNullUid, KServerUid3);

    37 	RProcess server;

    38 	TInt r = server.Create( KEvtHandlerServerImg, KNullDesC, serverUid );

    39 	if (r != KErrNone)

    40 		return r;

    41 	TRequestStatus stat;

    42 	server.Rendezvous(stat);

    43 	if (stat != KRequestPending)

    44 		server.Kill( 0 );		// abort startup

    45 	else

    46 		server.Resume();	// logon OK - start the server

    47 	User::WaitForRequest( stat );		// wait for start or death

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

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

    50 	// from KErrNone

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

    52 	server.Close();

    53 	EVTUIDEBUG("- StartServer()");

    54 	return r;

    55 	}

    56 

    57 // ----------------------------------------------------------------------------

    58 // REvtHandlerSession::Connect()

    59 // ----------------------------------------------------------------------------

    60 //

    61 EXPORT_C TInt REvtHandlerSession::Connect()

    62 /*

    63  * Connect to the server, attempting to start it if necessary

    64  */

    65 	{

    66 	EVTUIDEBUG("+ REvtHandlerSession::Connect()");

    67 	TInt retry = 2;

    68 	for (;;)

    69 		{

    70 		TInt r = CreateSession( KEvtHandlerServerName, TVersion( 0, 0, 0), 1 );

    71 		if ( r != KErrNotFound && r != KErrServerTerminated )

    72 			return r;

    73 

    74 		if ( --retry == 0 )

    75 			return r;

    76 

    77 		r = StartServer();

    78 		if ( r !=KErrNone && r != KErrAlreadyExists )

    79 			return r;

    80 		}

    81 	}

    82 

    83 // ----------------------------------------------------------------------------

    84 // REvtHandlerSession::SendEventId()

    85 // ----------------------------------------------------------------------------

    86 //

    87 EXPORT_C TInt REvtHandlerSession::SendEventId( const TDesC& aMessage, const TInt aAccuracy )

    88 	{

    89 	EVTUIDEBUG("+ REvtHandlerSession::SendEventId()");

    90 

    91 	if ( aMessage.Length() > KMaxEvtHandlerMessage )

    92 		return KErrArgument;

    93 	return SendReceive( ESendEventId, TIpcArgs( &aMessage, aAccuracy )  );

    94 	}