> I'm not sure I understand what you are asking.  Are you asking how to
> test that the standard handles aren't inherited by subprocesses?

I can check that the SetHandleInformation is returning TRUE so the handles
shouldn't be inherited already.  However, is there any Emacs feature
that will be
broken if the handles are inherited?  I would like to test that to make sure the
E2E flow is still working.

> Btw, I still don't think I've seen the patch you are want to test, so
> I don't even know if it's clean and correct by itself.

The patch is here
https://raw.githubusercontent.com/kiennq/emacs-build/main/patches/0004-init_ntproc-Use-SetHandleInformation-to-set-NOINHERI.patch
It's also attached in the mail.

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Kien