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Copyright (c) Microsoft Corporation
Module Name:
FxUserObjectApi.cpp
Abstract:
This modules implements the C API's for the FxUserObject.
Author:
Environment:
Both kernel and user mode
Revision History:
--*/
#include "fxobjectpch.hpp"
#include "fxuserobject.hpp"
// Tracing supportextern "C" {#if defined(EVENT_TRACING)#include "FxUserObjectApi.tmh"#endif}
extern "C" {
_Must_inspect_result___drv_maxIRQL(DISPATCH_LEVEL)NTSTATUSNTAPIWDFEXPORT(WdfObjectCreate)( __in PWDF_DRIVER_GLOBALS DriverGlobals, __in_opt PWDF_OBJECT_ATTRIBUTES Attributes, __out WDFOBJECT* Object )
/*++
Routine Description:
This creates a general WDF object for use by the device driver.
It participates in general framework object contracts in that it:
- Has a handle and a reference count - Has Cleanup and Destroy callbacks - Supports driver context memory and type - Can have child objects - Can optionally have a parent object and automatically delete with it
It is intended to allow a WDF device driver to use this object to create its own structures that can participate in frameworks lifetime management.
The device driver can use the objects context memory and type to represent its own internal data structures, and can further assign device driver specific resources and release them by registering for EvtObjectCleanup, and EvtObjectDestroy callbacks.
The object may be deleted by using the WdfObjectDelete API.
Since the object is represented by a frameworks handle, it can be reference counted, and validated.
Class drivers may use this object to define framework object handles for their types.
Arguments:
Attributes - WDF_OBJECT_ATTRIBUTES to define a parent object, context memory, Cleanup and Destroy handlers.
Return Value:
NTSTATUS
--*/
{ DDI_ENTRY();
NTSTATUS status; WDFOBJECT handle; FxUserObject* pUserObject; PFX_DRIVER_GLOBALS pFxDriverGlobals;
pUserObject = NULL; pFxDriverGlobals = GetFxDriverGlobals(DriverGlobals);
// // Get the parent's globals if it is present // if (NT_SUCCESS(FxValidateObjectAttributesForParentHandle(pFxDriverGlobals, Attributes))) { FxObject* pParent;
FxObjectHandleGetPtrAndGlobals(pFxDriverGlobals, Attributes->ParentObject, FX_TYPE_OBJECT, (PVOID*)&pParent, &pFxDriverGlobals); }
FxPointerNotNull(pFxDriverGlobals, Object);
status = FxValidateObjectAttributes(pFxDriverGlobals, Attributes, FX_VALIDATE_OPTION_EXECUTION_LEVEL_ALLOWED ); if (!NT_SUCCESS(status)) { return status; }
// // Create the FxObject. // status = FxUserObject::_Create(pFxDriverGlobals, Attributes, &pUserObject); if (NT_SUCCESS(status)) { handle = pUserObject->GetHandle(); *Object = handle;
DoTraceLevelMessage(pFxDriverGlobals, TRACE_LEVEL_VERBOSE, TRACINGUSEROBJECT, "Created UserObject Handle 0x%p", handle); }
return status;}
} // extern "C" the entire file