fxuserobject.cpp

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/*++
 
Copyright (c) Microsoft Corporation
 
Module Name:
 
    FxUserObject.cpp
 
Abstract:
 
    This module implements the user object that device
    driver writers can use to take advantage of the
    driver frameworks infrastructure.
 
Author:
 
 
 
 
Environment:
 
    Both kernel and user mode
 
Revision History:
 
 
 
 
 
 
--*/
 
#include "fxobjectpch.hpp"
 
#include "fxuserobject.hpp"
 
// Tracing support
extern "C" {
#if defined(EVENT_TRACING)
#include "FxUserObject.tmh"
#endif
}
 
_Must_inspect_result_
NTSTATUS
FxUserObject::_Create(
    __in     PFX_DRIVER_GLOBALS FxDriverGlobals,
    __in_opt PWDF_OBJECT_ATTRIBUTES Attributes,
    __out    FxUserObject** pUserObject
    )
{
    FxUserObject* pObject = NULL;
    NTSTATUS status;
    USHORT wrapperSize = 0;
    WDFOBJECT handle;
 
#ifdef INLINE_WRAPPER_ALLOCATION
#if FX_CORE_MODE==FX_CORE_USER_MODE
    wrapperSize = FxUserObject::GetWrapperSize();
#endif
#endif
 
    pObject = new(FxDriverGlobals, Attributes, wrapperSize)
        FxUserObject(FxDriverGlobals);
 
 
    if (pObject == NULL) {
        DoTraceLevelMessage(FxDriverGlobals, TRACE_LEVEL_ERROR, TRACINGOBJECT,
                            "Memory allocation failed");
        return STATUS_INSUFFICIENT_RESOURCES;
    }
 
    status = pObject->Commit(Attributes, &handle);
 
    if (!NT_SUCCESS(status)) {
        DoTraceLevelMessage(FxDriverGlobals, TRACE_LEVEL_ERROR,
                            TRACINGOBJECT,
                            "FxObject::Commit failed %!STATUS!", status);
    }
 
    if (NT_SUCCESS(status)) {
        *pUserObject = pObject;
    }
    else {
        pObject->DeleteFromFailedCreate();
    }
 
    return status;
}
 
//
// Public constructors
//
 
FxUserObject::FxUserObject(
    __in PFX_DRIVER_GLOBALS FxDriverGlobals
    ) :
#ifdef INLINE_WRAPPER_ALLOCATION
    FxNonPagedObject(FX_TYPE_USEROBJECT, sizeof(FxUserObject) + GetWrapperSize(), FxDriverGlobals)
#else
    FxNonPagedObject(FX_TYPE_USEROBJECT, sizeof(FxUserObject), FxDriverGlobals)
#endif
{
    return;
}