On Mon, Apr 06, 2020 at 06:40:57PM +0200, Dominique Martinet wrote: > Anyway, I agree looking at O_NONBLOCK for that isn't obvious. > I agree with the usecase here and posix allows short reads regardless of > the flag so the behaviour is legal either way ; the filesystem is > allowed to return whenever it wants on a whim - let's just add some docs > as you suggest unless Sergey has something to add. Ahahahahhahahahahaha. POSIX may well "allow" short reads, but userspace programmers basically never check the return value from read(). Short reads aren't actually allowed. That's why signals are only allowed to interrupt syscalls if they're fatal (and the application will never see the returned value because it's already dead).
