static void verify_broker_option(OptionsMap& options) { if (!options.count("servername")) { return; } struct addrinfo hints, *res; std::string broker = options["servername"]; memset(&hints, 0, sizeof(struct addrinfo)); hints.ai_family = AF_UNSPEC; if (getaddrinfo(broker.c_str(), NULL, &hints, &res) == 0) { freeaddrinfo(res); } else { OptionsMap::iterator iter = options.find("servername"); options.erase(iter); mh_err("Broker '%s' is not resolvable - ignoring", broker.c_str()); } }