The reference about poll() just says “The specified fd value is invalid. This flag is only valid in the revents member; it shall ignored in the events member.”.
That's not clear (at least to me): if the file descriptor is invalid, shouldn't poll return an error instead (negative return value)?
I had the same question about POLLERR and learned somewhere it may refers to, as an example, error in a device or network. This one, POLLNVAL, remains mysterious.
Do someone know example cases?
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