iterate.c

for(p = servinfo; p != NULL; p = p->ai_next) {
  sockfd = socket(p->ai_family, p->ai_socktype, p->ai_protocol);
  if (sockfd == -1) {
    perror("client: socket");
    continue;
  }

  if (connect(sockfd, p->ai_addr, p->ai_addrlen) == -1) {
    close(sockfd);
    perror("client: connect");
    continue;
  }

  break;
}