[fpc-pascal] How to detect connection status of a socket

[Xiangrong Fang]

Hi All,

I am writing a redis client in fpc and found that even when the connection
is closed by server (via redis CLIENT KILL),  send and receive can still be
done without error.  i.e.:

- fpsend returns the number of bytes sent
- fprecv returns 0 (but NOT -1, which indicate a "detectable" error, as per
the document)

I also checked socketerror after send/recv, no error is reported.

How do I tell if a socket is still connected or not?

Thanks
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