Re: [Valgrind-users] Calling arbitrary guest functions

[Derrick M. <der...@gm...>]

I am also interested in instrumenting the guest binary, as well as
change which guest function I execute at run time.  So LD_PRELOAD
won't help me here.

On Tue, Mar 3, 2020 at 10:41 AM John Reiser <jr...@bi...> wrote:
>
> > I am trying to make a tool that intercepts the call to main, and then
> > call an arbitrary function within the guest with arbitrary function
> > arguments.
>
> This can be done without valgrind by using LD_PRELOAD environment variable
> and RTLD_NEXT (see "man dlsym"):
>
>      LD_PRELOAD=main_interceptor.so  ./my_app args...
>
> where main_interceptor.so is a shared library that has a function main()
> and that can call the original main() by using dlsym(RTLD_NEXT, "main").
>
>
>
>
>
>
>
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-- 
Derrick McKee
Phone: (703) 957-9362
Email: der...@gm...