int main(int argc, char ** argv){
UA_String urls[1];
UA_Server *server = UA_Server_new();
UA_ServerConfig *uaServerConfig = UA_Server_getConfig(server);
signal(SIGPIPE , sigPipeHandler);
if(argc > 1){//set the hostname
urls[0] = UA_STRING(argv[1]);
uaServerConfig->serverUrls = urls;
uaServerConfig->serverUrlsSize = 1;
}
....
}