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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