Re: How to get ELF auxiliary vector address outside of main(), not using **argv nor **envp?

[Mike Frysinger <vapier at gentoo dot org>]

On Thursday 23 April 2009 11:22:40 Igor Zhbanov wrote:
> 2009/4/23 Ryan Arnold <ryan.arnold@gmail.com>:
> > Hi Igor, there's an example in one of the libc test cases that I
> > wrote.  My team member Sean Curry wrote the original auxv query code.
> >
> > http://sourceware.org/cgi-bin/cvsweb.cgi/libc/sysdeps/powerpc/fpu/tst-set
> >context-fpscr.c?rev=1.3&content-type=text/x-cvsweb-markup&cvsroot=glibc
> >
> > Look at the query_auxv() function.
> >
> > Uli doesn't want the auxv information exported from GLIBC so this is
> > the suggested method.
> >
> > We have a special library called libauxv to help with this but we
> > haven't released it yet.  I really should get on it.
>
> /proc/self/auxv is good but... But I need to run program on 2.4.x kernel
> too. And 2.4.x has no /proc/self/auxv file. Sigh.
>
> So I need to dig in the stack. Is there any exported glibc symbol (or
> function) that points
> somewhere nearby **argv or **envp in the stack during all of the
> program lifetime?

declare a constructor and grab the environ pointer then
-mike

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