trivialioctl.h

日本东京大学的驱动教程中的例子

/*++
Copyright (c) Microsoft Corporation.  All rights reserved.
--*/

//
// Device type           -- in the "User Defined" range."
//
#define TRIVIAL_TYPE 40000

//
// The IOCTL function codes from 0x800 to 0xFFF are for customer use.
//
#define IOCTL_TRIVIAL_GETLENGTH \
    CTL_CODE( TRIVIAL_TYPE, 0x900, METHOD_BUFFERED, FILE_ANY_ACCESS  )