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dad28bffd6
poll() sets POLLNVAL inside of the poll structures if an invalid fd is passed. So far we generally didn't check for that, thus not taking notice of the error. Given that this specific kind of error is generally indication of a programming error, and given that our code is embedded into our projects via NSS or because people link against our library, let's explicitly check for this and convert it to EBADF. (I ran into a busy loop because of this missing check when some of my test code accidentally closed an fd it shouldn't close, so this is a real thing)
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