RFR: 8154364: Files.isSameFile() throws NoSuchFileException with broken symbolic links [v2]

[Brian Burkhalter]

On Thu, 14 Aug 2025 16:17:59 GMT, Brian Burkhalter <bpb at openjdk.org> wrote:

>>> Did you try to using UnixFileAttribtues.getIfExists?
>> 
>> I think you're correct that this would speed up the common case a bit, but as implied, it would require adding `getIfExists` which does not follow links.
>
> For some reason TBD, `UnixFileAttributes.get` succeeds with a symlink loop but `UnixFileAttributes.getIfExists` fails with `ELOOP`.

The `ELOOP` apparently is from the `stat` syscall and does not occur in the current version because `access` is called before `stat` and does not fail in that way. So I am not sure that `getIfExists` is the way to go here unless we want to punt the link loop cases.

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PR Review Comment: https://git.openjdk.org/jdk/pull/26736#discussion_r2277142337