网络断开的条件

Question

有没有办法在不使用这两个API调用的情况下找出网络断开的情况？

//bytes/sec
curl_easy_setopt(object, CURLOPT_LOW_SPEED_LIMIT, dl_lowspeed_bytes);

//seconds while below low spped limit before aborting
curl_easy_setopt(object, CURLOPT_LOW_SPEED_TIME, dl_lowspeed_time);