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Date:	Thu, 11 Aug 2005 13:05:47 -0500
From:	Brian Ford <Brian DOT Ford AT flightsafety DOT com>
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Subject:	Re: "Segmentation fault" CygWin tools with code Injection-MS Detours
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On Thu, 11 Aug 2005, Christopher Faylor wrote:

> On Thu, Aug 11, 2005 at 02:58:58PM +0200, Louis Lecaroz wrote:
> >Having (if possible ;) ) a patch & a standard modification in cygwin to
> >allow this type of programming will be really great !
>
> Cygwin has its own (currently undocumented) hooking mechanism.  Setting
> the LD_PRELOAD environment variable to the name of a DLL will cause any
> function in the DLL to override the similarly named cygwin function.  It
> works similarly to linux:
>
>  LD_PRELOAD
>   A whitespace-separated list of additional, user-specified, ELF shared
>   libraries to be loaded before all others.  This can be used to
>   selectively override functions in other shared libraries.
>
> except that it uses DLLs rather than "ELF shared libraries".

Just to add a useless speculation that I don't currently have time to
follow up on...

I'd bet this is the mechanism used by SysInternals Process Explorer for
the currently broken (on Cygwin) DLL list and thread list features.  If
and when I have time to confirm this useless speculation, I'll report
back.  Unless someone else gets to it first... ;-).

-- 
Brian Ford
Senior Realtime Software Engineer
VITAL - Visual Simulation Systems
FlightSafety International
the best safety device in any aircraft is a well-trained pilot...

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