RFR: 6980847: (fs) Files.copy needs to be tuned [v6]

[Alan Bateman]

On Fri, 17 Jun 2022 16:06:52 GMT, Brian Burkhalter <bpb at openjdk.org> wrote:

> As `RESTARTABLE` is used in `transfer0()` this loop could go away.

Does the check for EINTR in transfer0 also go away? It maps it to IOS_INTERRUPTED but the use of RESTARTABLE means this code will never execute.

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PR: https://git.openjdk.org/jdk/pull/9161