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#ifndef __CANCEL_H
#define __CANCEL_H
#include <initguid.h>
//
// Since this driver is a legacy driver and gets installed as a service
// (without an INF file), we will define a class guid for use in
// IoCreateDeviceSecure function. This would allow the system to store
// Security, DeviceType, Characteristics and Exclusivity information of the
// deviceobject in the registery under
// HKLM\SYSTEM\CurrentControlSet\Control\Class\ClassGUID\Properties.
// This information can be overrided by an Administrators giving them the ability
// to control access to the device beyond what is initially allowed
// by the driver developer.
//
// {5D006E1A-2631-466c-B8A0-32FD498E4424} - generated using guidgen.exe
DEFINE_GUID (GUID_DEVCLASS_CANCEL_SAMPLE,
0x5d006e1a, 0x2631, 0x466c, 0xb8, 0xa0, 0x32, 0xfd, 0x49, 0x8e, 0x44, 0x24);
//
// GUID definition are required to be outside of header inclusion pragma to
// avoid error during precompiled headers.
//
#include <ntddk.h>
#include <wdmsec.h> // for IoCreateDeviceSecure
#include <dontuse.h>
// Debugging macros
#if DBG
#define CSAMP_KDPRINT(_x_) \
DbgPrint("CANCEL.SYS: ");\
DbgPrint _x_;
#define TRAP() DbgBreakPoint()
#else
#define CSAMP_KDPRINT(_x_)
#define TRAP()
#endif
#define CSAMP_DEVICE_NAME_U L"\\Device\\CANCELSAMP"
#define CSAMP_DOS_DEVICE_NAME_U L"\\DosDevices\\CancelSamp"
#define CSAMP_RETRY_INTERVAL 500*1000 //500 ms
#define TAG (ULONG)'MASC'
typedef struct _INPUT_DATA{
ULONG Data; //device data is stored here
} INPUT_DATA, *PINPUT_DATA;
typedef struct _DEVICE_EXTENSION{
// Irps waiting to be processed are queued here
LIST_ENTRY PendingIrpQueue;
// SpinLock to protect access to the queue
KSPIN_LOCK QueueLock;
// SpinLock to provide exclusive access to the port
KSPIN_LOCK DeviceLock;
// Pointer to current device IRP. Exclusive access to this
// field is also provided by the QueueLock.
PIRP CurrentIrp;
// Customtimer DPC object
KDPC PollingDpc;
// Time at which the device was last polled
LARGE_INTEGER LastPollTime;
// Polling timer object
KTIMER PollingTimer;
// Polling interval (retry interval)
LARGE_INTEGER PollingInterval;
IO_CSQ CancelSafeQueue;
} DEVICE_EXTENSION, *PDEVICE_EXTENSION;
typedef struct _FILE_CONTEXT{
//
// Lock to rundown threads that are dispatching I/Os on a file handle
// while the cleanup for that handle is in progress.
//
IO_REMOVE_LOCK FileRundownLock;
} FILE_CONTEXT, *PFILE_CONTEXT;
DRIVER_INITIALIZE DriverEntry;
_Dispatch_type_(IRP_MJ_CREATE)
_Dispatch_type_(IRP_MJ_CLOSE)
DRIVER_DISPATCH CsampCreateClose;
_Dispatch_type_(IRP_MJ_CLEANUP)
DRIVER_DISPATCH CsampCleanup;
_Dispatch_type_(IRP_MJ_READ)
DRIVER_DISPATCH CsampRead;
DRIVER_DISPATCH CsampPollDevice;
DRIVER_UNLOAD CsampUnload;
KDEFERRED_ROUTINE CsampPollingTimerDpc;
VOID
CsampInitiateIo(
_In_ PDEVICE_OBJECT DeviceObject
);
NTSTATUS
CsampInsertIrp (
_In_ PIO_CSQ Csq,
_In_ PIRP Irp,
_In_ PVOID InsertContext
);
VOID
CsampRemoveIrp(
_In_ PIO_CSQ Csq,
_In_ PIRP Irp
);
PIRP
CsampPeekNextIrp(
_In_ PIO_CSQ Csq,
_In_ PIRP Irp,
_In_ PVOID PeekContext
);
_IRQL_raises_(DISPATCH_LEVEL)
_IRQL_requires_max_(DISPATCH_LEVEL)
_Acquires_lock_(CONTAINING_RECORD(Csq,DEVICE_EXTENSION, CancelSafeQueue)->QueueLock)
VOID
CsampAcquireLock(
_In_ PIO_CSQ Csq,
_Out_ _At_(*Irql, _Post_ _IRQL_saves_) PKIRQL Irql
);
_IRQL_requires_(DISPATCH_LEVEL)
_Releases_lock_(CONTAINING_RECORD(Csq,DEVICE_EXTENSION, CancelSafeQueue)->QueueLock)
VOID
CsampReleaseLock(
_In_ PIO_CSQ Csq,
_In_ _IRQL_restores_ KIRQL Irql
);
VOID
CsampCompleteCanceledIrp(
_In_ PIO_CSQ pCsq,
_In_ PIRP Irp
);
#endif
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