C connect實現Timeout效果（Windows）

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int SocketClient::connectTimeOutForWin(SOCKET &connect_fd, const int &timeout, const sockaddr_in &server){    int error=-1, len;    len = sizeof(int);    timeval tm;    fd_set set;    unsigned long ul = 1;     //設定為非阻塞模式    ioctlsocket(connect_fd,FIONBIO,&ul);    bool ret = false;    if( connect(connect_fd, (struct sockaddr *)&server, sizeof(struct sockaddr)) == -1)    {        tm.tv_sec = timeout;        tm.tv_usec = 0;        FD_ZERO(&set);        FD_SET(connect_fd, &set);        if( select(-1, NULL, &set, NULL, &tm) > 0)        {              getsockopt(connect_fd, SOL_SOCKET, SO_ERROR, (char*)&error, &len);            if(error == 0) ret = true;            else ret = false;        } else ret = false;    }    else ret = true;    ul = 0;//設定為阻塞模式    ioctlsocket(connect_fd,FIONBIO,&ul);    if(!ret){        closesocket(connect_fd);//        fprintf(stderr,"Connect server fail in WIN\n");    }    return ret;}

 

C connect實現Timeout效果（Windows）