This function returns 1 if the connection has been aborted, otherwise it returns 0.
如果仍然保持连接，则函数返回0；如果断线，则函数返回1。
The transport connection was aborted by the local system.
本地系统已终止传输连接。
The network connection was aborted by the local system.
网络连接被终止的本地系统。
The network connection was aborted by the local system.
网络连接被终止的本地系统。
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