간단하게 말하자면..
timeout = 10;
memset((char *)&srv_addr, 0x00, sizeof(srv_addr));
srv_addr.sin_family = PF_INET;
srv_addr.sin_addr.s_addr = inet_addr(host_addr);
srv_addr.sin_port = htons(tcp_port);
if ((li_sock_id = socket(PF_INET, SOCK_STREAM, 0)) < 0) {
return (RET_ERR);
}
fcntl_flag = fcntl(li_sock_id, F_GETFL, 0);