Not sure where to ask this question because I mostly never program on Linux, so: where do the errno's go when you issue ops on an io_uring? To the naive user (me), it looks like they simple vanish, since cqe.res is documented as being simply "-1 on error". This can't be right?
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If it's not clear enough how it works, then they should be improved of course. But I'm honestly a bit at a loss at how you would arrive at that conclusion :-) But I'm always interested in improving it, especially if basic concepts like that aren't clear.
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Linux APIs have had many equivalent bad decisions as this, so I do not assume that the way that I think something should work is the way that it works.
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