IPv6 TCP Server using getaddrinfo() for Service Address Lookup

struct addrinfo *ainfo, *res;struct addrinfo hints;/* zero-out the hints before assignment */memset (&hints, 0, sizeof(hints));
.	hints.ai_family = AF_INET6;
 	hints.ai_flags = AI_PASSIVE;
	hints.ai_socktype = SOCK_STREAM;
 error = getaddrinfo(NULL, "example", &hints, &res); if (error != 0) {
 	fprintf(stderr, "%s: %s for service 'example'\n",
 			argv[0], gai_strerror(error));
 	exit(1);
 }
	 /* Create the listen socket. */
 ls = socket (res->ai_family, res->ai_socktype, res->ai_protocol);
 if (ls == -1) {
  perror(argv[0]);
 	fprintf(stderr, "%s: unable to create socket\n", argv[0]);
 	exit(1);
 }
 	/* Bind the listen address to the socket. */
 if (bind(ls, res->ai_addr, res->ai_addrlen) == -1) {
 	perror(argv[0]);
 	fprintf(stderr, "%s: unable to bind address\n", argv[0]);
 	close(ls);
 	exit(1);
 }
 	/* Initiate the listen on the socket so remote users
 	 * can connect.  The listen backlog is set to 5, which
 	 * is within the supported range of 1 to 20.
 	 */
 if (listen(ls, 5) == -1) {
 	perror(argv[0]);
 	fprintf(stderr, "%s: unable to listen on socket\n", argv[0]);
 	close(ls);
 	exit(1);
 }