Windows NT Driver >> C/C++ >> Timer
I/O
參考資訊:
1. Source Code
I/O Timer是Windows內核提供的一個Timer,呼叫的間隔固定為每秒一次,使用步驟:
1. IoInitializeTimer()
2. IoStartTimer()
3. IoStopTimer()
main.c
#include <wdm.h> #define IOCTL_START CTL_CODE(FILE_DEVICE_UNKNOWN, 0x800, METHOD_BUFFERED, FILE_ANY_ACCESS) #define IOCTL_STOP CTL_CODE(FILE_DEVICE_UNKNOWN, 0x801, METHOD_BUFFERED, FILE_ANY_ACCESS) #define DEV_NAME L"\\Device\\MyDriver" #define SYM_NAME L"\\DosDevices\\MyDriver" ULONG dwTimerCnt=0; VOID OnTimer(PDEVICE_OBJECT pOurDevice, PVOID pContext) { dwTimerCnt+= 1; DbgPrint("IoTimer: %d", dwTimerCnt); } void Unload(PDRIVER_OBJECT pOurDriver) { UNICODE_STRING usSymboName; RtlInitUnicodeString(&usSymboName, L"\\DosDevices\\MyDriver"); IoDeleteSymbolicLink(&usSymboName); IoDeleteDevice(pOurDriver->DeviceObject); } NTSTATUS IrpIOCTL(PDEVICE_OBJECT pOurDevice, PIRP pIrp) { NTSTATUS status; ULONG hThread; PIO_STACK_LOCATION psk = IoGetCurrentIrpStackLocation(pIrp); switch(psk->Parameters.DeviceIoControl.IoControlCode){ case IOCTL_START: DbgPrint("IOCTL_START"); dwTimerCnt = 0; IoStartTimer(pOurDevice); break; case IOCTL_STOP: DbgPrint("IOCTL_STOP"); IoStopTimer(pOurDevice); break; } pIrp->IoStatus.Information = 0; pIrp->IoStatus.Status = STATUS_SUCCESS; IoCompleteRequest(pIrp, IO_NO_INCREMENT); return STATUS_SUCCESS; } NTSTATUS IrpFile(PDEVICE_OBJECT pOurDevice, PIRP pIrp) { PIO_STACK_LOCATION psk = IoGetCurrentIrpStackLocation(pIrp); switch(psk->MajorFunction){ case IRP_MJ_CREATE: DbgPrint("IRP_MJ_CREATE"); break; case IRP_MJ_CLOSE: DbgPrint("IRP_MJ_CLOSE"); break; } IoCompleteRequest(pIrp, IO_NO_INCREMENT); return STATUS_SUCCESS; } NTSTATUS DriverEntry(PDRIVER_OBJECT pOurDriver, PUNICODE_STRING pOurRegistry) { PDEVICE_OBJECT pOurDevice=NULL; UNICODE_STRING usDeviceName; UNICODE_STRING usSymboName; pOurDriver->MajorFunction[IRP_MJ_CREATE] = pOurDriver->MajorFunction[IRP_MJ_CLOSE] = IrpFile; pOurDriver->MajorFunction[IRP_MJ_DEVICE_CONTROL] = IrpIOCTL; pOurDriver->DriverUnload = Unload; RtlInitUnicodeString(&usDeviceName, L"\\Device\\MyDriver"); IoCreateDevice(pOurDriver, 0, &usDeviceName, FILE_DEVICE_UNKNOWN, 0, FALSE, &pOurDevice); RtlInitUnicodeString(&usSymboName, L"\\DosDevices\\MyDriver"); IoInitializeTimer(pOurDevice, OnTimer, NULL); IoCreateSymbolicLink(&usSymboName, &usDeviceName); pOurDevice->Flags&= ~DO_DEVICE_INITIALIZING; pOurDevice->Flags|= DO_BUFFERED_IO; return STATUS_SUCCESS; }
DriverEntry()初始化I/O Timer
IrpIOCTL()啟動或停止I/O Timer
OnTimer()僅列印訊息,其餘事情不做
app.c
#define INITGUID #include <windows.h> #include <winioctl.h> #include <strsafe.h> #include <setupapi.h> #include <stdio.h> #include <stdlib.h> #define IOCTL_START CTL_CODE(FILE_DEVICE_UNKNOWN, 0x800, METHOD_BUFFERED, FILE_ANY_ACCESS) #define IOCTL_STOP CTL_CODE(FILE_DEVICE_UNKNOWN, 0x801, METHOD_BUFFERED, FILE_ANY_ACCESS) int __cdecl main(int argc, char* argv[]) { HANDLE hFile = NULL; DWORD dwRet = 0; hFile = CreateFile("\\\\.\\MyDriver", GENERIC_READ | GENERIC_WRITE, 0, NULL, OPEN_EXISTING, 0, NULL); if (hFile == INVALID_HANDLE_VALUE) { printf("failed to open mydriver\n"); return -1; } DeviceIoControl(hFile, IOCTL_START, NULL, 0, NULL, 0, &dwRet, NULL); Sleep(3000); DeviceIoControl(hFile, IOCTL_STOP, NULL, 0, NULL, 0, &dwRet, NULL); CloseHandle(hFile); return 0; }
結果