RFR: 8277489: Rewrite JAAS UnixLoginModule with FFM [v5]

[Maurizio Cimadamore]

On Fri, 2 Jan 2026 17:00:37 GMT, Weijun Wang <weijun at openjdk.org> wrote:

>> Rewrite the native calls with FFM.
>
> Weijun Wang has updated the pull request incrementally with one additional commit since the last revision:
> 
>   fail early on Windows, and more comments

src/jdk.security.auth/share/classes/com/sun/security/auth/module/UnixSystem.java line 90:

> 88:             = (ValueLayout.OfLong) LINKER.canonicalLayouts().get("size_t");
> 89: 
> 90:     private static Linker.Option ccs = Linker.Option.captureCallState("errno");

names of static final fields should be capitalized?

src/jdk.security.auth/share/classes/com/sun/security/auth/module/UnixSystem.java line 121:

> 119:             // While we don't need those fields here, the struct needs to be
> 120:             // big enough to avoid buffer overflow when `getpwuid_r` is called.
> 121:             MemoryLayout.sequenceLayout(100, C_CHAR).withName("dummy"));

maybe use a padding layout here? (assuming you don't want clients to access the bytes in `dummy`)

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PR Review Comment: https://git.openjdk.org/jdk/pull/28931#discussion_r2661328588
PR Review Comment: https://git.openjdk.org/jdk/pull/28931#discussion_r2661324659