int main(int argc, char **argv)
{
    sqlite *db;
    sqlite* db = sqlite_open(argv[1], 770);
    sqlite_create_function(db,
                           "CURRENT_TIME",0,
                           current_time,NULL);
    sqlite_exec(db, "select CURRENT_TIME()",
                callback_fn);
    sqlite_close(db);
    return 0;
}