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Adaptation/GUID-3102F778-DD2F-4C87-A0DF-7FA44C9709D8.dita
author Graeme Price <GRAEME.PRICE@NOKIA.COM>
Fri, 15 Oct 2010 14:32:18 +0100
changeset 15 307f4279f433
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<?xml version="1.0" encoding="utf-8"?>
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<!-- Copyright (c) 2007-2010 Nokia Corporation and/or its subsidiary(-ies) All rights reserved. -->
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<!-- This component and the accompanying materials are made available under the terms of the License
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"Eclipse Public License v1.0" which accompanies this distribution,
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and is available at the URL "http://www.eclipse.org/legal/epl-v10.html". -->
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<!-- Initial Contributors:
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    Nokia Corporation - initial contribution.
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Contributors:
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-->
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<!DOCTYPE concept
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  PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd">
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<concept id="GUID-3102F778-DD2F-4C87-A0DF-7FA44C9709D8" xml:lang="en"><title>Multiple
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Client Support</title><shortdesc>This document describes how multiple clients can access a driver
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over a single logical channel.</shortdesc><prolog><metadata><keywords/></metadata></prolog><conbody>
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<p>A single channel has a single handle which is shared by driver users. A
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driver can allow or prevent the sharing of a handle to a logical channel between
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multiple users. This policy is implemented by the <xref href="GUID-A3CC1D95-4681-3349-A67C-F113A614041D.dita#GUID-A3CC1D95-4681-3349-A67C-F113A614041D/GUID-9E23019E-7383-371E-B63C-85500F6B653D"><apiname>DLogicalChannel::RequestUserHandle()</apiname></xref> function.
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The default implementation does not restrict sharing of the channel, but a
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driver can override the function to change this. </p>
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<p>In the following example, the driver ensures that only the intended clients
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can get the handle and access the driver. Any other client that tries to share
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the handle gets a <codeph>KErrAccessDenied</codeph> error. </p>
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<codeblock id="GUID-2FEB04B3-ABD3-58E4-BFDB-0AD947BA6E16" xml:space="preserve">TInt DExDriverLogicalChannel::RequestUserHandle(DThread* aThread,
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        TOwnerType aType)
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    {
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    // Handle should be provided only to the intended client. Any
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    // other clients that try to get a handle to the driver should get an access
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    // denied error.
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    if ( aType!=EOwnerThread || aThread!=iClient)
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        return KErrAccessDenied;
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    return KErrNone;
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    }</codeblock>
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<p> <xref href="GUID-A3CC1D95-4681-3349-A67C-F113A614041D.dita#GUID-A3CC1D95-4681-3349-A67C-F113A614041D/GUID-9E23019E-7383-371E-B63C-85500F6B653D"><apiname>DLogicalChannel::RequestUserHandle()</apiname></xref> only restricts
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the user from sharing or duplicating an existing channel. It does not restrict
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another process from opening its own separate channel on the same device. </p>
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<p> <note> More than one user can access the driver at the same time. It is
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up to the driver to manage and provide correct and secure access to the driver. </note></p>
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</conbody></concept>
FCL/sftools/depl/docscontent