On Thu, Nov 07 2013, Alan Stern wrote: > What happens if the userspace daemon writes to epfile but the host > changes the config or altsetting before all the data can be sent? Does > the remaining data get flushed? Each read and write is mapped to a single request, so the usual. > I'm still a little unclear on this. Disabling the function ought to > have much the same effect as changing the config or altsetting: Writes > to endpoint files should be flushed and reads should be terminated. > Otherwise you would end up sending stale data to the host or reading > data that the daemon isn't prepared for. You may have a point here. I'll try to prepare a patch over the weekend. > Given that, there doesn't seem to be any need for a loop. Copy the > data; if the function was disabled in the meantime then throw away the > data and return an appropriate error code. Right. > I don't see any reason why you should ever have to copy the same data > from userspace multiple times. That actually never happens. The data is copied at most once. -- Best regards, _ _ .o. | Liege of Serenely Enlightened Majesty of o' \,=./ `o ..o | Computer Science, Michał “mina86” Nazarewicz (o o) ooo +--<mpn@xxxxxxxxxx>--<xmpp:mina86@xxxxxxxxxx>--ooO--(_)--Ooo--
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