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Re: About the dll search algorithm of dlopen

From: Yaakov Selkowitz <yselkowitz at cygwin dot com>
To: cygwin-developers at cygwin dot com
Date: Wed, 1 Jun 2016 18:29:30 -0500
Subject: Re: About the dll search algorithm of dlopen
Authentication-results: sourceware.org; auth=none
References: <574E835E dot 7090109 at ssi-schaefer dot com> <20160601110947 dot GE11431 at calimero dot vinschen dot de> <574EF07B dot 1060806 at ssi-schaefer dot com> <20160601201748 dot GI11431 at calimero dot vinschen dot de>

On 2016-06-01 15:17, Corinna Vinschen wrote:

LD_PRELOAD is (kind of) implemented but I think doesn't work as
intended.  Importing symbols is bound to the name of the DLL they came
from in a PE/COFF file.

However, as long as you're overriding symbols in cygwin1.dll,cygwin_internal(CW_HOOK,...) allows LD_PRELOAD hacks to work asintended. In fact, there are a few in the distro (artsdsp, datefudge,pulsedsp, Xdummy).


--
Yaakov

References:
- About the dll search algorithm of dlopen
  - From: Michael Haubenwallner
- Re: About the dll search algorithm of dlopen
  - From: Corinna Vinschen
- Re: About the dll search algorithm of dlopen
  - From: Michael Haubenwallner
- Re: About the dll search algorithm of dlopen
  - From: Corinna Vinschen

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