RFR: 8370314: Update signals_posix with new Linux signal codes [v2]

[David Holmes]

On Thu, 8 Jan 2026 07:30:19 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> Looks reasonable, thanks.

Thanks for the review @shipilev  

> I wish we could check the hard-coded values with the actual exported values (when available in building with newer GCC), but that is likely hard to do at preprocessor level.

`static_assert` in the else of the `#ifndef`? I can try that - though we make assumptions about these sorts of things anyway e.g. SYS_call values. And I don't think these are values that can ever be changed once glibc is exporting them, so we have captured the right value.

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PR Comment: https://git.openjdk.org/jdk/pull/29105#issuecomment-3722524674