NTSTATUS NTAPI NullDispatch	(	IN PDEVICE_OBJECT	DeviceObject,
		IN PIRP	Irp
	)
Definition at line 81 of file null.c.
Referenced by DriverEntry().
{
    PIO_STACK_LOCATION IoStack = IoGetCurrentIrpStackLocation(Irp);
    NTSTATUS Status;
    PFILE_OBJECT FileObject;
    ULONG Length;
    PAGED_CODE();

    /* Get the file object and check what kind of request this is */
    FileObject = IoStack->FileObject;
    switch (IoStack->MajorFunction)
    {
        case IRP_MJ_CREATE:
        case IRP_MJ_CLOSE:

            /* Check if this is synch I/O */
            if (FileObject->Flags & FO_SYNCHRONOUS_IO)
            {
                /* Set distinguished value for Cc */
                FileObject->PrivateCacheMap = (PVOID)1;
            }

            /* Complete successfully */
            Irp->IoStatus.Status = STATUS_SUCCESS;
            Irp->IoStatus.Information = 0;
            break;

         case IRP_MJ_READ:

            /* Return as if we read the entire file */
            Irp->IoStatus.Status = STATUS_END_OF_FILE;
            Irp->IoStatus.Information = 0;
            break;

        case IRP_MJ_WRITE:

            /* Return as if we wrote the entire request */
            Irp->IoStatus.Status = STATUS_SUCCESS;
            Irp->IoStatus.Information = IoStack->Parameters.Write.Length;
            break;

        case IRP_MJ_LOCK_CONTROL:

            /* Dummy */
            Irp->IoStatus.Status = STATUS_SUCCESS;
            Irp->IoStatus.Information = 0;
            break;

        case IRP_MJ_QUERY_INFORMATION:

            /* Get the length inputted and do the request */
            Length = IoStack->Parameters.QueryFile.Length;
            Irp->IoStatus.Status = NullQueryFileInformation(Irp->AssociatedIrp.
                                                            SystemBuffer,
                                                            &Length,
                                                            IoStack->
                                                            Parameters.
                                                            QueryFile.
                                                            FileInformationClass);

            /* Return the actual length */
            Irp->IoStatus.Information = Length;
            break;
    }

    /* Complete the request */
    Status = Irp->IoStatus.Status;
    IoCompleteRequest(Irp, IO_NO_INCREMENT);
    return Status;
}
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