Re: UDP recvmsg blocks after select(), 2.6 bug?

[H. Peter Anvin]

Chris Friesen wrote:
> H. Peter Anvin wrote:
>
> > EIO seems to be The Right Thing[TM]... it pretty much says "yes, we
> > received something, but it was bad."  What isn't clear to me is how
> > applications react to EIO.  It could easily be considered a fatal
> > error... :-/
>
>
>  From an application point of view, The Right Thing would be to do the 
> checksum validation at select() time if the socket is blocking.
>
> If it's nonblocking, then just do as we do now and return EAGAIN at 
> recvmsg() time.
>
> This would ensure that all existing apps get the expected semantics, but 
> the ones based on blocking sockets would see a performance degredation.

Doing work twice can hardly be considered The Right Thing.

	-hpa
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