#include <stdio.h>
#include <dlfcn.h>
int main() {
    while (1) {
        void* h = dlopen("./shared.so", RTLD_NOW);
        char* e = dlerror();
        if (e) {
            printf("%s\n", e);
            return 1;
        }
        void (*p)(void) = dlsym(h, "prt");
        p();
        dlclose(h);
        getchar();
    }
}

/*
clang -o loadshared loadshared.c -ldl
./loadshared

in another terminal
cp shared2.so shared.so

enter -> getchar()

cp shared1.so shared.so

enter -> getchar()

*/