RFR: 8277489: Rewrite JAAS UnixLoginModule with FFM [v2]

[Weijun Wang]

On Mon, 22 Dec 2025 14:30:21 GMT, Weijun Wang <weijun at openjdk.org> wrote:

>> src/jdk.security.auth/share/classes/jdk/internal/ffi/generated/jaas_unix/package-info.java line 35:
>> 
>>> 33:  *   echo "#include <spwd.h>" >> $HEADER_NAME
>>> 34:  *
>>> 35:  *
>> 
>> nit: extra line, but please ignore if jextract generated.
>
> Not generated.

Thanks for the comments. I've pushed a new commit that removes all jextract-generated code and go fully manual. Is this better?

BTW, I haven't studied the use of `errorno` yet. Also, I have a TODO item at the beginning of `UnixLoginModule::login`. Please tell me your opinion on my concern.

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PR Review Comment: https://git.openjdk.org/jdk/pull/28931#discussion_r2640097898