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Dmitry Torokhov authored
According to the standard count 0 is special - no IO should happen but we can check error conditions (device gone away, etc), and return 0 if there are no errors. We used to return -EINVAL instead and we also could return 0 if an event was "stolen" by another thread. Signed-off-by:
Dmitry Torokhov <dtor@mail.ru>
2872a9b5