A question about dynamic linking

[Daniel Jacobowitz]

On Wed, Mar 15, 2006 at 08:40:14PM +0100, Albert Miranda wrote:
> I'm working on a project related with the dynamic linker and I need to
> know which libraries have been loaded and where (in which base
> addresses) from the same program that needs them to avoid mmapping a
> library that's already been loaded.
> 
> Exploring through ld.so.1 code I've seen there's a list of link_map
> structures that contains the information I need and is maintained
> during the life of the loaded program (I assume this is done to
> provide lazy binding), but when trying to access it through
> dl_rtld_map I'm (logically) unable to do it (gcc doesn't complain but
> ld.so.1 can't resolve the symbol).
> 
> Is there any way to do this?

Yes.  Instead of looking for the rtld map directly, go through
_DYNAMIC; find the DT_DEBUG tag, which will point to a structure
of type "struct r_debug".  And that'll point to the link map chain.

-- 
Daniel Jacobowitz
CodeSourcery