Messages in this thread | | | Subject | Re: [HW_RNG] How to use generic rng in kernel space | From | Alan Cox <> | Date | Tue, 01 Aug 2006 14:29:54 +0100 |
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Ar Maw, 2006-08-01 am 12:09 +0000, ysgrifennodd moreau francis: > Another question about the implementation. If O_NONBLOCK > flag is passed when opening /dev/hw_random, how does the > read method ensure that the caller won't sleep since it calls > mutex_lock_interruptible() function unconditiannaly ? I must > miss something but don't know what...
O_NONBLOCK doesn't necessarily imply "never sleep", it implies "don't sleep waiting for an event/long time". So where the mutex is just serializing access to hardware that will be very brief it is fine not to check O_NONBLOCK/FNDELAY.
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