Re: [ros-dev] Re:[ros-svn] [ion] 12748: Fix incorrect LPC Object export...we export pointers not the object itself! Also remove more TIME stuf

[Hartmut Birr]

Filip Navara schrieb:

>   Filip Navara wrote:
>
> >   Hartmut Birr wrote:
> >
> > >   I think that Alex's changes are correct. If
> > > Alex's changes are 
> > >  wrong, all other type object initialisations are also wrong. There 
> > >  is only one little bug, the EXPORTED/IMPORTED definition is missing. 
> >
> >  Hmm, you might be right... 
>
>  I have searched the net a bit and looked into my books.
>
>  Windows NT Filesystem Internals:
>  "...at system initialization time, the NT I/O Manager registers all 
>  the different I/O Manager objects (including the file object 
>  structure) with the NT Object Manager. The ObCreateObjectType() Object 
>  Manager routine is used for this purpose. Although this routine is not 
>  exposed by the NT Executive, it serves to make the NT Object Manager 
>  aware of a new object type. When invoking this routine, the I/O 
>  Manager also supplies the functions that must be invoked by the Object 
>  Manager to manipulate the object being defined. For file object 
>  structures, the I/O Manager supplies an internal routine called 
>  IopCloseFile() to be invoked whenever any handle associated with the 
>  file object has been closed."
>
>  The ObCreateObjectType function has prototype similar to this:
>
>  and it's used like
>
>     RtlZeroMemory(&ObjectTypeInitializer, 
>  sizeof(OBJECT_TYPE_INITIALIZER));
>     ObjectTypeInitializer.Length = sizeof(OBJECT_TYPE_INITIALIZER);
>     ...
>     RtlInitUnicodeString(&ObjectTypeName, L"Port");
>     ObCreateObjectType(&ObjectTypeName, &ObjectTypeInitializer, 0, 
>  &LpcPortObjectType);
>
>  so yes, the exported *ObjectType variables are really of type 
>  POBJECT_TYPE.
>
>  My apologies to Alex.
>
>  Regards,
>  Filip
>
>
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>  
Hi,

I've add some code to my test driver:

  Status = ZwCreateEvent(&hEvent, EVENT_ALL_ACCESS, NULL, 
NotificationEvent, FALSE);
  DPRINT1("%x\n", Status);
  if (NT_SUCCESS(Status))
  {
     Status = ObReferenceObjectByHandle(hEvent, EVENT_ALL_ACCESS, 
(POBJECT_TYPE)ExEventObjectType, KernelMode, (PVOID*)&Event, NULL);
     DPRINT1("%x\n", Status);
     if (NT_SUCCESS(Status))
     {
        ObDereferenceObject((PVOID)Event);
     }
     Status = ObReferenceObjectByHandle(hEvent, EVENT_ALL_ACCESS, 
(POBJECT_TYPE)&ExEventObjectType, KernelMode, (PVOID*)&Event, NULL);
     DPRINT1("%x\n", Status);
     if (NT_SUCCESS(Status))
     {
        ObDereferenceObject((PVOID)Event);
     }
     ZwClose(hEvent);
  }

The result on W2K is:

(memtest.c:185) 0
(memtest.c:189) 0
(memtest.c: 195) c0000024 -> STATUS_OBJECT_TYPE_MISMATCH

This means Alex's changes and the other object type initialisations are 
correct.

- Hartmut