Access pointer from shared library in C

Question

I built a shared library which exposes an array of function pointers. The function definitions are also in this library, but they are not exported.

Is it possible, from another program, to load this library and call those functions using the exported pointers directly?

This is what I'm trying to do.

My library:

#include <stdio.h>
void myfun(){
    printf("myfun\n");
}
extern void (*myptr)() = myfun;

I'm trying to use it like this:

#include <dlfcn.h>
int main(){
    void * lib = dlopen("libt1.so", RTLD_NOW);
    if(!lib) { printf("%s\n", dlerror()); return 0; }
    void (*myptr)() = (void (*)()) dlsym(lib, "myptr");
    if(!myptr){ printf("%s\n", dlerror()); return 0; }
    printf("%p\n", myptr);
    myptr();
}

This gives a segm fault.

Answer 1

It was a silly mistake it seems.

void (*myptr)() = (void (*)()) dlsym(lib, "myptr");

Should be something like this:

void ** myptr = (void**)dlsym(lib, "myptr");
void (*fcn)() = (void (*)()) (*myptr);

It is working as expected now.