Hi, Alan Stern <st...@rowland.harvard.edu> writes: > On Fri, 13 May 2016, Felipe Balbi wrote: > >> We deliver to userspace the part userspace requested, right? So that's >> okay. The USB details WRT e.g. babble or host trying to send more data >> than expected, needs to be handled within the kernel. > > The point is that you don't know whether the host sent more data than > expected. All you know is that the host sent more data than the user > asked the kernel for -- but maybe the user didn't ask for all the data > that he expected. Maybe the user wanted to retrieve the full set of > data using two read() system calls.
right, but that just means we need to buffer the data instead of bailing out of the first read() completely. -- balbi
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