Re: [Chromium-dev] crfaker fix

[Ricky Uy <ric...@ya...>]

You're right, I found the article you mentioned on MSDN. But if that is the case, then are applications like Celestia doomed to be able to work on Chromium in their original, unmodified state? In it's unmodified state, stubInit() is never going to be called before the glViewport() call, and I don't see any other areas of the crfaker dll where the call to stubInit() would make sense. Celestia will just call glViewport and it will immediately get intercepted by windows_exports.c and try to jmp to an invalid location. I suppose checks could be made in the windows_exports file to see if stubInit has already been called or not, but it wouldn't be good to make function calls like that inside of NAKED functions. Do you know any other places that might be okay for it?


Greg Humphreys <hu...@cs...> wrote:
If I recall correctly, this is (was?) explicitly documented in MSDN as 
being illegal (manual loading of other DLL's within DLLMain). It USED 
to be there, and then I discovered this, and moved it.

--
Greg Humphreys, Assistant Professor
Department of Computer Science, University of Virginia
http://www.cs.virginia.edu/~humper/


On Jun 23, 2004, at 11:37 AM, Ricky Uy wrote:

> Hi,
>
> For the Windows version of this library, there should be a call to 
> stubInit() just before the return in DLLMain() in load.c, and all the 
> calls to stubInit() should be removed from the wgl functions in wgl.c. 
> There were several applications that would bail out because of this, 
> including Celestia for Windows. However with this patch, they all 
> work.
>
> The problem was that some applications don't call wgl functions before 
> trying to do other things. For example, especially in direct response 
> to Alicia's post, Celestia would try to call ShowWindow() before 
> calling ChoosePixelFormat(). This caused a crash because ShowWindow 
> makes a call to glViewport, and because stubInit() had not yet been 
> called, the glim dispatch table was nulled out. So there was a crash. 
> By having stubInit() in DLLMain, issues like these are resolved.
>
> Now there was a comment above DLLMain saying that Windows didn't allow 
> the loading of other libraries in DLLMain, and I'm not sure what has 
> happened since, but it works fine. Hope this helps some people with 
> their applications.
>
> Ricky
>
> Do you Yahoo!?
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