[systemd-devel] Compatibility between D-Bus and kdbus

Lennart Poettering mzqohf at 0pointer.de
Tue Nov 25 08:19:41 PST 2014

On Mon, 24.11.14 18:40, Thiago Macieira (thiago at kde.org) wrote:

> Another thought that comes to mind: should we reserve the entire highest bit 
> in connection IDs for broadcasts? It would allow for the existence of 
> multicast groups in the future.

I discussed this quickly with the kdbus guys, and while none of us was
thrilled about the posibility of introducing such a concept we all
agreed that if it should be introduced one day it really should be
part of the well-known names concept, not the unique names
concept. Meaning: you'd put a label on a group, and join the group by
the label then, rather than via numeric ids...

In general, numeric ids are about being automatic, and well-known
names are about discoverability. But mcast memberships should never be
automatic, but only about discoverability, hence using unique ids for
identifying them sounds wrong.

Hope that makes sense.


Lennart Poettering, Red Hat

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