Mercurial Mercurial > oss > MCL > sftools > depl > docscontent / annotate
summary | shortlog | changelog | graph | tags | bookmarks | branches | files | changeset | file | latest | revisions | annotate | diff | comparison | raw | help
Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
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
permissions -rw-r--r--
Initial contribution of the Adaptation Documentation.
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
15
307f4279f433 Initial contribution of the Adaptation Documentation.
Graeme Price <GRAEME.PRICE@NOKIA.COM>
parents:
diff changeset 
     1
 
<?xml version="1.0" encoding="utf-8"?>
307f4279f433 Initial contribution of the Adaptation Documentation.
Graeme Price <GRAEME.PRICE@NOKIA.COM>
parents:
diff changeset 
     2
 
<!-- Copyright (c) 2007-2010 Nokia Corporation and/or its subsidiary(-ies) All rights reserved. -->
307f4279f433 Initial contribution of the Adaptation Documentation.
Graeme Price <GRAEME.PRICE@NOKIA.COM>
parents:
diff changeset 
     3
 
<!-- This component and the accompanying materials are made available under the terms of the License
307f4279f433 Initial contribution of the Adaptation Documentation.
Graeme Price <GRAEME.PRICE@NOKIA.COM>
parents:
diff changeset 
     4
 
"Eclipse Public License v1.0" which accompanies this distribution,
307f4279f433 Initial contribution of the Adaptation Documentation.
Graeme Price <GRAEME.PRICE@NOKIA.COM>
parents:
diff changeset 
     5
 
and is available at the URL "http://www.eclipse.org/legal/epl-v10.html". -->
307f4279f433 Initial contribution of the Adaptation Documentation.
Graeme Price <GRAEME.PRICE@NOKIA.COM>
parents:
diff changeset 
     6
 
<!-- Initial Contributors:
307f4279f433 Initial contribution of the Adaptation Documentation.
Graeme Price <GRAEME.PRICE@NOKIA.COM>
parents:
diff changeset 
     7
 
    Nokia Corporation - initial contribution.
307f4279f433 Initial contribution of the Adaptation Documentation.
Graeme Price <GRAEME.PRICE@NOKIA.COM>
parents:
diff changeset 
     8
 
Contributors:
307f4279f433 Initial contribution of the Adaptation Documentation.
Graeme Price <GRAEME.PRICE@NOKIA.COM>
parents:
diff changeset 
     9
 
-->
307f4279f433 Initial contribution of the Adaptation Documentation.
Graeme Price <GRAEME.PRICE@NOKIA.COM>
parents:
diff changeset 
    10
 
<!DOCTYPE concept
307f4279f433 Initial contribution of the Adaptation Documentation.
Graeme Price <GRAEME.PRICE@NOKIA.COM>
parents:
diff changeset 
    11
 
  PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd">
307f4279f433 Initial contribution of the Adaptation Documentation.
Graeme Price <GRAEME.PRICE@NOKIA.COM>
parents:
diff changeset 
    12
 
<concept id="GUID-3102F778-DD2F-4C87-A0DF-7FA44C9709D8" xml:lang="en"><title>Multiple
307f4279f433 Initial contribution of the Adaptation Documentation.
Graeme Price <GRAEME.PRICE@NOKIA.COM>
parents:
diff changeset 
    13
 
Client Support</title><shortdesc>This document describes how multiple clients can access a driver
307f4279f433 Initial contribution of the Adaptation Documentation.
Graeme Price <GRAEME.PRICE@NOKIA.COM>
parents:
diff changeset 
    14
 
over a single logical channel.</shortdesc><prolog><metadata><keywords/></metadata></prolog><conbody>
307f4279f433 Initial contribution of the Adaptation Documentation.
Graeme Price <GRAEME.PRICE@NOKIA.COM>
parents:
diff changeset 
    15
 
<p>A single channel has a single handle which is shared by driver users. A
307f4279f433 Initial contribution of the Adaptation Documentation.
Graeme Price <GRAEME.PRICE@NOKIA.COM>
parents:
diff changeset 
    16
 
driver can allow or prevent the sharing of a handle to a logical channel between
307f4279f433 Initial contribution of the Adaptation Documentation.
Graeme Price <GRAEME.PRICE@NOKIA.COM>
parents:
diff changeset 
    17
 
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.
307f4279f433 Initial contribution of the Adaptation Documentation.
Graeme Price <GRAEME.PRICE@NOKIA.COM>
parents:
diff changeset 
    18
 
The default implementation does not restrict sharing of the channel, but a
307f4279f433 Initial contribution of the Adaptation Documentation.
Graeme Price <GRAEME.PRICE@NOKIA.COM>
parents:
diff changeset 
    19
 
driver can override the function to change this. </p>
307f4279f433 Initial contribution of the Adaptation Documentation.
Graeme Price <GRAEME.PRICE@NOKIA.COM>
parents:
diff changeset 
    20
 
<p>In the following example, the driver ensures that only the intended clients
307f4279f433 Initial contribution of the Adaptation Documentation.
Graeme Price <GRAEME.PRICE@NOKIA.COM>
parents:
diff changeset 
    21
 
can get the handle and access the driver. Any other client that tries to share
307f4279f433 Initial contribution of the Adaptation Documentation.
Graeme Price <GRAEME.PRICE@NOKIA.COM>
parents:
diff changeset 
    22
 
the handle gets a <codeph>KErrAccessDenied</codeph> error. </p>
307f4279f433 Initial contribution of the Adaptation Documentation.
Graeme Price <GRAEME.PRICE@NOKIA.COM>
parents:
diff changeset 
    23
 
<codeblock id="GUID-2FEB04B3-ABD3-58E4-BFDB-0AD947BA6E16" xml:space="preserve">TInt DExDriverLogicalChannel::RequestUserHandle(DThread* aThread,
307f4279f433 Initial contribution of the Adaptation Documentation.
Graeme Price <GRAEME.PRICE@NOKIA.COM>
parents:
diff changeset 
    24
 
        TOwnerType aType)
307f4279f433 Initial contribution of the Adaptation Documentation.
Graeme Price <GRAEME.PRICE@NOKIA.COM>
parents:
diff changeset 
    25
 
    {
307f4279f433 Initial contribution of the Adaptation Documentation.
Graeme Price <GRAEME.PRICE@NOKIA.COM>
parents:
diff changeset 
    26
 
    // Handle should be provided only to the intended client. Any
307f4279f433 Initial contribution of the Adaptation Documentation.
Graeme Price <GRAEME.PRICE@NOKIA.COM>
parents:
diff changeset 
    27
 
    // other clients that try to get a handle to the driver should get an access
307f4279f433 Initial contribution of the Adaptation Documentation.
Graeme Price <GRAEME.PRICE@NOKIA.COM>
parents:
diff changeset 
    28
 
    // denied error.
307f4279f433 Initial contribution of the Adaptation Documentation.
Graeme Price <GRAEME.PRICE@NOKIA.COM>
parents:
diff changeset 
    29
 
    if ( aType!=EOwnerThread || aThread!=iClient)
307f4279f433 Initial contribution of the Adaptation Documentation.
Graeme Price <GRAEME.PRICE@NOKIA.COM>
parents:
diff changeset 
    30
 
        return KErrAccessDenied;
307f4279f433 Initial contribution of the Adaptation Documentation.
Graeme Price <GRAEME.PRICE@NOKIA.COM>
parents:
diff changeset 
    31
 
    return KErrNone;
307f4279f433 Initial contribution of the Adaptation Documentation.
Graeme Price <GRAEME.PRICE@NOKIA.COM>
parents:
diff changeset 
    32
 
    }</codeblock>
307f4279f433 Initial contribution of the Adaptation Documentation.
Graeme Price <GRAEME.PRICE@NOKIA.COM>
parents:
diff changeset 
    33
 
<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
307f4279f433 Initial contribution of the Adaptation Documentation.
Graeme Price <GRAEME.PRICE@NOKIA.COM>
parents:
diff changeset 
    34
 
the user from sharing or duplicating an existing channel. It does not restrict
307f4279f433 Initial contribution of the Adaptation Documentation.
Graeme Price <GRAEME.PRICE@NOKIA.COM>
parents:
diff changeset 
    35
 
another process from opening its own separate channel on the same device. </p>
307f4279f433 Initial contribution of the Adaptation Documentation.
Graeme Price <GRAEME.PRICE@NOKIA.COM>
parents:
diff changeset 
    36
 
<p> <note> More than one user can access the driver at the same time. It is
307f4279f433 Initial contribution of the Adaptation Documentation.
Graeme Price <GRAEME.PRICE@NOKIA.COM>
parents:
diff changeset 
    37
 
up to the driver to manage and provide correct and secure access to the driver. </note></p>
307f4279f433 Initial contribution of the Adaptation Documentation.
Graeme Price <GRAEME.PRICE@NOKIA.COM>
parents:
diff changeset 
    38
 
</conbody></concept>
MCL/sftools/depl/docscontent