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Re: how to hook into shared libraries (by chaining)

From: Christian Parpart
Subject: Re: how to hook into shared libraries (by chaining)
Date: Thu, 15 Feb 2007 14:49:48 +0100
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On Tuesday 13 February 2007 13:33:58 Ralf Wildenhues wrote:
> * Christian Parpart wrote on Tue, Feb 13, 2007 at 11:59:35AM CET:
> > I want to override some functions located in and, in
> > order to capture movies from (any) OpenGL application.
> >
> > There are now several ways to achieve this, but none of them seems to be
> > userfriendly *and* ideal (system/platform independant).
> The question is how portable you want to be.  Only Gentoo?  Only
> GNU/Linux?  Only ELF systems?  Only GNU binutils ld?  Or also, say, w32,
> or AIX non-runtimelinking, or otherwise native non-GNU linker?
> Can we assume the libGL and libX11 all come from
> Is using a wrapper shell script acceptable for you?
> Is patching a binary (a la objcopy) acceptable for you?>

I found a solution to this problem I'd like to share here 
(see attachemed
However, this way I had to modify the system libGL/libX11 
files by stripping away their DT_SONAME. I did not manage 
how to do so, but I at least found a way to rename this entry.

With this build system, the user is expected to have the $(libdir) in 
LD_LIBRARY_PATH (or /etc/, which is much better than 
enforcing him to use LD_PRELOAD_LIBRARY because now the lib is only 
loaded when the client app is linked against libGL and/or libX11.

However, I do not know how portable this is ;)


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