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Re: motion: update exception and flag operations for consistency
By having these functions (and the other ones you proposed)
return void (instead of boolean or int), there is no way
to find out if they succeeded or failed.
How could they fail? Conforming implementations (there's a predicate to
test that) must provide them.
These functions concern signaling exceptions and raising flags as defined
in 754R glossary. These are not Unix signals. The functions I
defined have no failure modes.