Armadilloフォーラム

    SOCKET_TYPE s;
    struct sockaddr_in server;
    if ((s = socket(AF_INET, SOCK_STREAM, 0)) == INVALID_SOCKET) {
        //error
        goto l_err;
    }
    fcntl(s, F_SETFL, O_NONBLOCK);      //nonblocking
    server.sin_addr.s_addr = inet_addr(server_ip);
    server.sin_family = AF_INET;
    server.sin_port = htons(server_port);
    (void)connect(s, (struct sockaddr *)&server, sizeof(server));   //non blocking socket always returns -1
 
    FD_ZERO(&writefds);
    FD_SET(s, &writefds);
    FD_ZERO(&readfds);
    FD_SET(s, &readfds);
    while (1) {
        FD_ZERO(&exfds);
        memcpy(&rfds, &readfds, sizeof(fd_set));
        memcpy(&wfds, &writefds, sizeof(fd_set));
        ret = pselect(s + 1, &rfds, &wfds, &exfds, &remain_timeout, NULL);
        error_no = errno;
        if (ret < 0) {              //error
             switch (error_no) {
             case EINTR:
                 continue;
             default:
                 goto l_err;
        } else if (ret == 0) {      //timeout
            goto l_err;
        } else {
            if (FD_ISSET(s, &wfds)) {                    //connected
                //一般的な接続判定！
            }
        }