DragonFlyBSD

#include <dlfcn.h>

#include <stdio.h>

#include <stdlib.h>

int main(void) {

   void* handle;

   void* func;

   handle = dlopen("libssl.so",  RTLD_NOW | RTLD_GLOBAL);

   if (handle) {

      func = dlsym(handle, "CRYPTO_set_id_callback");

      if (!func) {

         printf("error, can't load CRYPTO_set_id_callback\n");

         exit(1);

      } else {

         printf("loaded CRYPTO_set_id_callback\n");

         exit(0);

      }

   } else {

      printf("error, can't open libssl.so: %s\n", dlerror());

      exit(1);

   }

   dlclose(handle); 

   exit(0);

}