Programming

if (connect(fd,(struct sockaddr *)&addr, (socklen_t)sizeof(struct sockaddr)) == -1)
   return -1;
 cout<<"Connected ,ERRNO:"<<errno<<", txt:"<<strerror(errno);

netstat -na |grep 9102
tcp        0      0 192.168.151.42:9102         192.168.151.42:9102         ESTABLISHED

Connected ,ERRNO:42, txt:No message of desired type

class Connection
{
        int fd,ctr;
        struct hostent *he;
        struct sockaddr_in host;
        int portno;
        public:
        bool Connect();
        Connection(int port);
};


Connection::Connection(int _port):ctr(0)
{
        portno = _port;
        if ((he=gethostbyname("192.168.151.42")) == NULL)
                throw runtime_error("gethostbyname failed"+string(strerror(errno)));
        if ((fd = socket(AF_INET, SOCK_STREAM, 0)) == -1)
                throw runtime_error("socket creation failed"+string(strerror(errno)));
        host.sin_family = AF_INET;
        host.sin_port = htons(portno);
        host.sin_addr = *((struct in_addr *)he->h_addr);
        memset(&(host.sin_zero),'\0', 8);
}

bool Connection::Connect()
{
        ctr++;
        if (connect(fd,(struct sockaddr *)&host, (socklen_t)sizeof(struct sockaddr)) == -1)
                return false;
        cout<<"Connected after "<<ctr<<"try ,New Sd:"<<fd<<"\n";
        cout<<"Just Checking-ERRNO:"<<errno<<", txt:"<<strerror(errno)<<"\n";
        return true;
}
int main()
{
        Connection cobj(9816);

        while(cobj.Connect()==false)
                usleep(1000);
        sleep(20);
}

>./a.out
Connected after 6724try ,New Sd:3
Just Checking-ERRNO:111, txt:Connection refused

>netstat -na |grep 9816
tcp        0      0 192.168.151.42:9816         192.168.151.42:9816         ESTABLISHED