Re: dlopening the C runtime library

[Ralf Wildenhues]

* Sam Varshavchik wrote on Sun, Dec 06, 2009 at 02:52:52PM CET:
> 
> My use case is intercepting a main application's calls to library
> functions. I set LD_PRELOAD to preload my own shared library which
> provides replacement symbols for socket(), connect(), etc…

What level of portability do you need?  GNU/Linux only?  ELF?

> My wrapper needs to find the real socket() and connect(). I haven't
> checked this yet, but I suspect that since my shared library was
> loaded ahead of libc, after lt_dlopen(NULL), using lt_dlsym() will
> simply return a pointer to my own symbols, rather than libc's.

Yes, that sounds like it, although I must admit that I haven't fully
understood the above description.  Uses of -Bsymbolic may give you
trouble.

Cheers,
Ralf