How to correctly assign a pointer returned by dlsym into a variable of function pointer type?

Question

I am trying to use dlopen() and dlsym() in my code and compile it with gcc.

Here is the first file.

/* main.c          


        

Answer 1

you can use union, like this:

union {
    void *ptr;
    void (*init_google_logging) (char* argv0);
} orig_func;

orig_func.ptr = dlsym (RTLD_NEXT, "_ZN6google17InitGoogleLoggingEPKc");

orig_func.init_google_logging (argv0);