CLUS_STARTING_PARAMS structure (clusapi.h)

Indicates whether a node's attempt to start the Cluster service represents an attempt to form or join a cluster, and whether the node has attempted to start this version of the Cluster service before. Resource DLLs receive the CLUS_STARTING_PARAMS structure with the CLUSCTL_RESOURCE_TYPE_STARTING_PHASE1 and CLUSCTL_RESOURCE_TYPE_STARTING_PHASE2 control codes.

Syntax

typedef struct CLUS_STARTING_PARAMS {
  DWORD dwSize;
  BOOL  bForm;
  BOOL  bFirst;
} CLUS_STARTING_PARAMS, *PCLUS_STARTING_PARAMS;

Members

dwSize

Byte size of the structure.

bForm

Indicates whether this particular start of the Cluster service represents a form or a join operation.

TRUE

The node starting the Cluster service is attempting to form a cluster. No other nodes are currently active.

FALSE

The node starting the Cluster service is attempting to join an existing cluster. At least one other node is currently active.

bFirst

Indicates whether this version of the Cluster service has ever started on the node.

TRUE

The node is starting a version of the Cluster service for the first time.

FALSE

The node has started this version of the Cluster service previously.

Remarks

The CLUS_STARTING_PARAMS structure allows resource DLLs to respond to the CLUSCTL_RESOURCE_TYPE_STARTING_PHASE1 and CLUSCTL_RESOURCE_TYPE_STARTING_PHASE2 control codes based on the circumstances of the start. For example, a DLL might perform special initialization steps when the cluster forms, and perform another set of operations in response to joins.

Examples

The following example illustrates an abbreviated implementation of ResourceTypeControl. For more information, see Implementing ResourceTypeControl.

const LPWSTR g_MY_RESOURCE_TYPE_NAME[] =
{
    L"MyType_0",
    L"MyType_1",
    L"MyType_2",
    L"MyType_3"
};

DWORD WINAPI MyDllResourceTypeControl(
    IN LPCWSTR ResourceTypeName,
    IN DWORD ControlCode,
    IN PVOID InBuffer,
    IN DWORD InBufferSize,
    OUT PVOID OutBuffer,
    IN DWORD OutBufferSize,
    OUT LPDWORD BytesReturned
)
{
    DWORD status;
    PCLUS_STARTING_PARAMS pStart;

    switch ( ControlCode )
    {
        case CLUSCTL_RESOURCE_TYPE_STARTING_PHASE1:

            if( lstrcmpi( ResourceTypeName, g_MY_RESOURCE_TYPE_NAME[2] ) == 0 )
            {
                pStart = (PCLUS_STARTING_PARAMS) InBuffer;
                if( ( pStart->bForm == TRUE ) && 
                    ( pStart->bFirst == FALSE ) )
                {
                //  Hypothetical initialization code for resource type "MyType_2"
                //  Fires only when the cluster forms, but not for first-time launches of the Cluster service.
                }
            }
            else
            {
                status = ERROR_INVALID_FUNCTION;
            }

            break;

        case CLUSCTL_RESOURCE_TYPE_STARTING_PHASE2:

            pStart = (PCLUS_STARTING_PARAMS) InBuffer;
            if( pStart->bFirst == TRUE )
            {
            //  Hypothetical verification code for all resource types supported by the DLL
            //  Fires for first-time launches of the Cluster service
            }
            else
            {
                status = ERROR_INVALID_FUNCTION;
            }

            break;

    //  case ( Other control codes )....
    //      ...
    //      break;

        default:
            status = ERROR_INVALID_FUNCTION;
            break;

    }
    // end switch

    return( status );

}
// MyDllResourceTypeControl

Requirements

See also

CLUSCTL_RESOURCE_TYPE_STARTING_PHASE1

CLUSCTL_RESOURCE_TYPE_STARTING_PHASE2