[crac] RFR: 8371462: [CRaC] Improve listening socket reopen through FD policies [v2]

[Radim Vansa]

On Wed, 12 Nov 2025 08:58:00 GMT, Timofei Pushkin <tpushkin at openjdk.org> wrote:

>> Radim Vansa has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Disable selector test on Linux
>
> A test fails on Windows — should it be marked Linux-only until JDK-8371549 is resolved?

@TimPushkin I've finally gotten myself to this; fixing the Windows failure (wasn't that simple after all) and eventually implementing @mz1999 's idea to deal with the keys in `ServerSocketChannelImpl`. The type checks look fishy, but I think that this is mostly a result of some tech debt in the classes; if someone invents their own channel, selector and key types, this will likely break anyway.

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PR Comment: https://git.openjdk.org/crac/pull/275#issuecomment-3586530094