www.pudn.com > PCIConf.rar > ReadWrite.cpp

// Read/Write request processors for PCIConf driver 
// Copyright (C) 1999 by Walter Oney 
// All rights reserved 
 
#include "stddcls.h" 
#include "driver.h" 
 
/////////////////////////////////////////////////////////////////////////////// 
 
#pragma PAGEDCODE 
 
NTSTATUS DispatchCreate(PDEVICE_OBJECT fdo, PIRP Irp) 
	{							// DispatchCreate 
	PAGED_CODE(); 
	PDEVICE_EXTENSION pdx = (PDEVICE_EXTENSION) fdo->DeviceExtension; 
 
	PIO_STACK_LOCATION stack = IoGetCurrentIrpStackLocation(Irp); 
 
	// Claim the remove lock in Win2K so that removal waits until the 
	// handle closes. Don't do this in Win98, however, because this 
	// device might be removed by surprise with handles open, whereupon 
	// we'll deadlock in HandleRemoveDevice waiting for a close that 
	// can never happen because we can't run the user-mode code that 
	// would do the close. 
 
	NTSTATUS status; 
	if (win98) 
		status = STATUS_SUCCESS; 
	else  
		status = IoAcquireRemoveLock(&pdx->RemoveLock, stack->FileObject); 
 
	if (NT_SUCCESS(status)) 
		{						// okay to open 
		if (InterlockedIncrement(&pdx->handles) == 1) 
			{					// first open handle 
			}					// okay to open 
		}					// first open handle 
	return CompleteRequest(Irp, status, 0); 
	}							// DispatchCreate 
 
/////////////////////////////////////////////////////////////////////////////// 
 
#pragma PAGEDCODE 
 
NTSTATUS DispatchClose(PDEVICE_OBJECT fdo, PIRP Irp) 
	{							// DispatchClose 
	PAGED_CODE(); 
	PDEVICE_EXTENSION pdx = (PDEVICE_EXTENSION) fdo->DeviceExtension; 
	PIO_STACK_LOCATION stack = IoGetCurrentIrpStackLocation(Irp); 
	if (InterlockedDecrement(&pdx->handles) == 0) 
		{						// no more open handles 
		}						// no more open handles 
	 
	// Release the remove lock to match the acquisition done in DispatchCreate 
 
	if (!win98) 
		IoReleaseRemoveLock(&pdx->RemoveLock, stack->FileObject); 
 
	return CompleteRequest(Irp, STATUS_SUCCESS, 0); 
	}							// DispatchClose 
 
/////////////////////////////////////////////////////////////////////////////// 
 
#pragma PAGEDCODE 
 
NTSTATUS StartDevice(PDEVICE_OBJECT fdo, PCM_PARTIAL_RESOURCE_LIST raw, PCM_PARTIAL_RESOURCE_LIST translated) 
	{							// StartDevice 
	PDEVICE_EXTENSION pdx = (PDEVICE_EXTENSION) fdo->DeviceExtension; 
 
	return STATUS_SUCCESS; 
	}							// StartDevice 
 
/////////////////////////////////////////////////////////////////////////////// 
 
#pragma PAGEDCODE 
 
VOID StopDevice(IN PDEVICE_OBJECT fdo, BOOLEAN oktouch /* = FALSE */) 
	{							// StopDevice 
	PDEVICE_EXTENSION pdx = (PDEVICE_EXTENSION) fdo->DeviceExtension; 
	}							// StopDevice