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<task xml:lang="en" id="GUID-82499F0B-2791-59B6-9BAE-F9F87234FBF1"><title>Implementing a NifMan Daemon Tutorial</title><shortdesc>This topic describes the steps involved in implementing a NifMan Daemon. </shortdesc><prolog><metadata><keywords/></metadata></prolog><taskbody><context><p>Daemons are loaded when a connection is started that requires network layer configuration. The ECom configuration daemon manager used for a connection is specified in the <xref href="GUID-F0251041-3AFA-3FD1-88C7-10FB5E98F28B.dita"><apiname>SERVICE_CONFIG_DAEMON_MANAGER_NAME</apiname></xref> field in the <xref href="GUID-BD971173-E009-58DA-AF9C-F4AAFF77B138.dita">Comms Database</xref> Dial Out ISP and GPRS Packet Service tables. The daemon server used for a connection is specified in the <xref href="GUID-2768D204-6FA4-3D07-91E8-D1963FFE028D.dita"><apiname>SERVICE_CONFIG_DAEMON_NAME</apiname></xref> field in the CommDb Dial Out ISP and GPRS Packet Service tables. </p> <p>To implement a configuration daemon, you must write a Symbian OS server for more information see <xref href="GUID-6047DB3F-DC92-51DF-9EEB-00E79E890B54.dita">Using Client/Server</xref>. </p> <p>The name of the server in <xref href="GUID-D75692B1-FB2C-3893-9CF1-33BD02BBC63F.dita#GUID-D75692B1-FB2C-3893-9CF1-33BD02BBC63F/GUID-5D37DC05-93BC-3ED0-87EC-B500ADF55526"><apiname>CServer::Start()</apiname></xref> must match the name used in the CommDb <xref href="GUID-2768D204-6FA4-3D07-91E8-D1963FFE028D.dita"><apiname>SERVICE_CONFIG_DAEMON_NAME</apiname></xref> field. </p> <p>The following <codeph>ServiceL()</codeph> implementation tests for these messages types and calls functions: </p> <codeblock id="GUID-8E8F8E53-5D7E-583D-8341-1C6658A2B5FE" xml:space="preserve">void CEgConfigDaemonSession::ServiceL(const RMessage2&amp; aMessage)

  {

  switch (aMessage.Function())

    {

  case EConfigDaemonConfigure:

    ConfigureL(aMessage);

    break;

  case EConfigDaemonDeregister:

    DeregisterL(aMessage);

    break;

  case EConfigDaemonLinkLayerDown:

    LinkLayerDownL(aMessage);

    break;

  case EConfigDaemonLinkLayerUp:

    LinkLayerUpL(aMessage);

    break;

  case EConfigDaemonProgress:

    ProgressL(aMessage);

    break;

  case EConfigDaemonIoctl:

    IoctlL(aMessage);

    break;

  case EConfigDaemonCancel:

    Cancel(aMessage);

    break;

  case EConfigDaemonCancelMask:

    CancelMask(aMessage);

    break;

  default:

    User::Leave(KErrNotSupported);

    break;

    }