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If the system is suspended then it may not realise that a TCP connection has
been closed, while waiting for data to arrive on it. We didn't used to apply
a timeout to this read operation. Now we use the connection's default timeout
on all read and write operations. Network operations that don't pass a timeout
will be logged with a backtrace, so that they can be fixed.
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Otherwise the protocol might be broken and can't be used any more, even if
we made an effort to return an Error reply instead of throwing an exception.
This used to not be a problem because an Error reply would terminate the
connection anyway, but it no longer does. So if the client also didn't
terminate, but tried to handle the exception and keep using the connection,
then it might find that its next command fails because the protocol is broken.
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and a SelfFlushingStream class which can be used to ensure that protocol
streams are always flushed, to avoid breaking protocol.
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