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

[Brian Burkhalter]

On Fri, 30 May 2025 08:13:53 GMT, Alan Bateman <alanb at openjdk.org> wrote:

> The newDirectoryStream methods return a SecureDirectoryStream on platforms that support all the "at" syscalls (list is in UnixNativeDispatcher.c)

Note that I did not add `fchmodat` to this list of capabilities for all the "at" syscalls as it appears to be supported at least on all configurations [certified for Oracle JDK 24](https://bugs.openjdk.org/browse/JDK-8357425?focusedId=14782741&page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#comment-14782741). I am not sure about AIX however.

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PR Comment: https://git.openjdk.org/jdk/pull/25534#issuecomment-2922769346