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conncheck: use unix.Poll instead of syscall.Read #1456
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var errUnexpectedRead = errors.New("unexpected read from socket")
"golang.org/x/sys/unix"
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Does this work on Windows?
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No, it doesn't, as current implementation too.
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Description
connCheck() now uses Poll() to check netConn readability.
When some event is happened, try reading from the connection and log error as much as possible.
Fix #1392
Checklist