RFR: 8357425: (fs) SecureDirectoryStream setPermissions should use fchmodat

[Brian Burkhalter]

On Fri, 30 May 2025 05:34:30 GMT, Alan Bateman <alanb at openjdk.org> wrote:

> If you adds`int mode = UnixFileModeAttribute.toUnixMode(perms)` then it would avoid the repeated code and avoid the line splits, just makes it easier to read.

Agreed.

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PR Review Comment: https://git.openjdk.org/jdk/pull/25534#discussion_r2116255936