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源代码在线查看: control.cpp

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上传用户: lqlm521
关键词: 驱动开发
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相关代码

				// Control.cpp -- IOCTL handlers for wmiextra driver
				// Copyright (C) 1999 by Walter Oney
				// All rights reserved
				
				#include "stddcls.h"
				#include "driver.h"
				#include "ioctls.h"
				#include "guids.h"
				
				///////////////////////////////////////////////////////////////////////////////
				
				#pragma PAGEDCODE
				
				NTSTATUS DispatchControl(PDEVICE_OBJECT fdo, PIRP Irp)
					{							// DispatchControl
					PAGED_CODE();
					PDEVICE_EXTENSION pdx = (PDEVICE_EXTENSION) fdo->DeviceExtension;
				
					NTSTATUS status = IoAcquireRemoveLock(&pdx->RemoveLock, Irp);
					if (!NT_SUCCESS(status))
						return CompleteRequest(Irp, status, 0);
					ULONG info = 0;
				
					PIO_STACK_LOCATION stack = IoGetCurrentIrpStackLocation(Irp);
					ULONG cbin = stack->Parameters.DeviceIoControl.InputBufferLength;
					ULONG cbout = stack->Parameters.DeviceIoControl.OutputBufferLength;
					ULONG code = stack->Parameters.DeviceIoControl.IoControlCode;
				
					switch (code)
						{						// process request
				
					case IOCTL_FIRE_EVENT:				// code == 0x800
						{						// IOCTL_FIRE_EVENT
						if (!pdx->evenable)
							{					// event not enabled
							status = STATUS_INVALID_DEVICE_REQUEST;
							break;
							}					// event not enabled
				
						// Construct an event object in nonpaged memory. The system will free this
						// when it's no longer needed
				
						PULONG junk = (PULONG) ExAllocatePool(NonPagedPool, sizeof(ULONG));
						if (!junk)
							{
							status = STATUS_INSUFFICIENT_RESOURCES;
							break;
							}
				
						*junk = 42;
						status = WmiFireEvent(fdo, (LPGUID) &GUID_WMIEXTRA_EVENT, 0, sizeof(ULONG), junk);
						if (!NT_SUCCESS(status))
							KdPrint((DRIVERNAME " - WmiFireEvent failed - %X\n", status));
						break;
						}						// IOCTL_FIRE_EVENT
				
				
					default:
						status = STATUS_INVALID_DEVICE_REQUEST;
						break;
				
						}						// process request
				
					IoReleaseRemoveLock(&pdx->RemoveLock, Irp);
					return CompleteRequest(Irp, status, info);
					}							// DispatchControl
							

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