RFR: 8277489: Rewrite JAAS UnixLoginModule with FFM

[Weijun Wang]

On Mon, 22 Dec 2025 07:19:07 GMT, Shawn M Emery <duke at openjdk.org> wrote:

>> Rewrite the native calls with FFM.
>
> src/jdk.security.auth/share/classes/com/sun/security/auth/module/UnixSystem.java line 64:
> 
>> 62:             int groupnum = getgroups(0, MemorySegment.NULL);
>> 63:             if (groupnum == -1) {
>> 64:                 throw new RuntimeException("getgroups returns " + groupnum);
> 
> Not a must-have, but would be nice to have a FFM for `errno` to provide better diagnostics.

Good idea. There is a `Linker.Option.captureCallState("errno")` feature and I'll see how to use it.

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PR Review Comment: https://git.openjdk.org/jdk/pull/28931#discussion_r2639956766