handling unknown messages (pt 2 of TODO)

Iskren Chernev iskren.chernev at gmail.com
Mon Apr 11 12:00:03 PDT 2011

I also thought of this, but I think in one unix packet more than one message
can be stored, which makes skipping of a single message impossible without
the number of fds stored in the message itself.


On Mon, Apr 11, 2011 at 8:00 PM, Bill Spitzak <spitzak at gmail.com> wrote:

> Are you talking about Wayland messages between the client and compositor?
> I don't understand why you need to identify fd's in unknown message in
> order to skip them. Isn't there a total length of the message and the fd's
> are just embedded in this block of bytes?
> I'm probably missing something here, sorry if this is a stupid question. It
> sounds like the client is required to do something with every fd found in a
> message, whether they understood it or not, but that has to be wrong!
> Iskren Chernev wrote:
>> Hello,
>> I think I can do the second point in the TODO file:
>> The message format has to include information about number of fds
>> in the message so we can skip a message correctly.  Or we should
>> just give up on trying to recover from unknown messages.  We need
>> to make sure you never get a message from an interface you don't
>> know about (using per-client id space and subscribe) or include
>> information on number of fds, so marshalling logic can skip.
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