Check the TCP connection still active

Hi,

	if ((fd_listen = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0)
	{
		alt_NetworkErrorHandler(EXPANDED_DIAGNOSIS_CODE," Socket creation failed");
	}
	sockval = 1;
	if (setsockopt(fd_listen, SOL_SOCKET, SO_KEEPALIVE, &sockval, sizeof(sockval)) == -1)
	{
		printf("Warning : KeepAlive option set failed\n");
	}

	rx_code = recv(conn->fd, conn->rx_wr_pos, 
			SSS_RX_BUF_SIZE - (conn->rx_wr_pos - conn->rx_buffer) -1, 0);
	if(rx_code > 0)
      	{
        	conn->rx_wr_pos += rx_code;
		/* Zero terminate so we can use string functions */
		*(conn->rx_wr_pos+1) = 0;
      	}
      	else if(rx_code == -1) // Case of timeout lost TCP connection
      	{
      		conn->close = 1;
      	}