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SubjectSA_INTERRUPT
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What is the current wisdom on SA_INTERRUPT?

A comment in signal.h about it says "dummy -- ignored". Elsewhere it says
that "SA_INTERRUPT is a no-op left for historical reasons".

That certainly doesn't seem to be the case in irq.c. It appears to be used
like this: if SA_INTERRUPT isn't set, enable interrupts during interrupt
handling.

So what is this flag for? How, when, and why should it be used?

Thanks.

Regards,
Brad


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