Re: POLLRDONCE optimisation for epoll users (was: epoll and half

Davide Libenzi (
Sun, 13 Jul 2003 20:17:50 -0700 (PDT)

On Mon, 14 Jul 2003, Jamie Lokier wrote:

> Jamie Lokier wrote:
> > (e) there is urgent data with OOBINLINE (I think)
> To be more precise, using the POLLRDHUP patch as-is, if someone sends
> your program some data, then an URGent segment, then a FIN with
> optional data in between, your program won't notice the second data or
> FIN and will fail to clean up the socket.

And why ? To me it looks fairly simple. When the FIN is received a wakeup
is done on the poll wait list and the following f_op->poll will fetch the
RDHUP flag. Then the next epoll_wait() will fetch the event and will have
all the info it needs to do things correctly.

- Davide

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