how to add a new glibc symbol ?

[Net Llama!]

On Wed, 3 Dec 2003, Roger Oberholtzer wrote:
> On Wed, 3 Dec 2003 09:23:42 -0500 (EST)
> Net Llama! <netllama at linux-sxs.org> wrote:
>
> > On Wed, 3 Dec 2003, Roger Oberholtzer wrote:
> > > The Linux program loader will load a DSO (libxx.so) specified in an
> > > environment variable when an application starts. This would allow you to
> > > make a dummy library to provide the missing label. I always thought this
> > > was both a neat and a dangerous feature. I believe it it the very first
> > > thing loaded, so it should be available to libc.
> > >
> > > Let me know if you are interested and I will relocate the name of the
> > > environment variable. It was something like LD_PRELOAD=libxyx.so.
> >
> > Yes, I'm very interested in this.  I think i ran across an LD_PRELOAD
> > variable, but didn't quite understand the gist of it.  One problem though,
> > is that I have ctype_b.c, so how would I turn that into a shared library
> > (so) for use with the LD_PRELOAD var?
>
> I posted a link with examples earlier today. They make it more complicated
> bu intercepting the time() function. You need not be so fancy to just make a
> function that satisfies the loader. It included the command lines to compile
> and all. Did you see that link?

Yes, i saw it, thanks.  I'll look into it tonight when i'm home, and let
you know how it goes.

-- 
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Lonni J Friedman				netllama at linux-sxs.org
Linux Step-by-step & TyGeMo		     http://netllama.ipfox.com