#include <stdio.h>
#include <stdlib.h>

/* link with -ldl */
#include <dlfcn.h>              /* dlopen(), dlsym(), dlclose() */

void print_usage(int argc, char **argv)
{
    fprintf(stderr, "Usage: %s LIB FUNC_NAME\n", argv[0]);
}

int main(int argc, char **argv)
{
    if (argc <= 2) {
        print_usage(argc, argv);
        exit(EXIT_FAILURE);
    }

    const char* filename = argv[1];
    const char* funcname = argv[2];

    void *lib = dlopen(filename, RTLD_GLOBAL | RTLD_LAZY);

    if (lib) {
        void (*f)() = dlsym(lib, funcname);

        if (f) {
            f();
        } else {
            fprintf(stderr, "Failed to find symbol `%s` in %s\n", funcname, filename);
        }

        dlclose(lib);
    } else {
        fprintf(stderr, "Failed to load library %s\n", filename);
    }

    return 0;
}