[Click] Socket delayed read

[Beyers Cronje]

Hi,

What version of Click are you running? There has been some bug fixes to
Socket a while back that addressed some notifier and scheduling bugs.

Beyers

On Thu, Jul 19, 2012 at 3:25 PM, Christine Jones <cej at bbn.com> wrote:

> Hello!
>
> I am using Click to set up a router that installs a proxy service for a
> subset of traffic. Much of the traffic flowing through the router is
> forwarded as normal. But some traffic that meets certain criteria is sent
> to the proxy (a user-space process on the local machine). The proxy also
> sends packets and other state back to the Click router.
>
> There are two versions of this router, kernel and user-level. I am
> encountering a problem with the user-level version. The communication
> between router and proxy is via the Socket element configured to be a unix
> socket, as such...
>
> proxy :: Socket(UNIX, 'pathname', CLIENT true)
>
> FromDevice
>         ...
>         -> proxy;
>
> proxy
>         ...
>         -> Queue
>         -> RawSocket(TCP);
>
> The problem is that when the router has a period in which no packets are
> forwarded to the proxy the socket may not be read (although the socket is
> configured for reading in the select loop and there is data waiting from
> the proxy). If I force the router to write to that socket (with a periodic
> keep-alive) then the socket will be read. However, I would prefer to not
> have to rely on keep-alives. The socket should be selected when there is
> data to read.
>
> Any thoughts?
>
> Thanks!
>
> Christine
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