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    SubjectRe: [PATCH 0/10] af_unix: add multicast and filtering features to AF_UNIX
    On Fri, 2 Mar 2012, David Miller wrote:

    > From: Luiz Augusto von Dentz <>
    > Date: Fri, 2 Mar 2012 10:39:24 +0200
    >> Like I said before there is many projects using AF_UNIX as IPC
    >> transport, the documentation actually induces people to use for this
    >> purpose, and many would benefit from being able to do multicast.
    > You can't have it both ways.
    > If it's useful for many applications, then many applications would
    > benefit from a userland library that solved the problem using
    > existing facilities such as IP multicast.

    I missed the start of this discussion (but did see the article on

    as I understand it, they are looking for some features that are not in IP
    multicast (or at least not as I understand it)

    1. reliable delivery

    2. in-order delivery

    3. sender blocking on recipients rather than dropping messages when the
    channel is full.

    IP multicast definantly does not do #3, and as far as I understand it, is
    essentially UDP to multiple recipients, and UDP does not provide either #1
    or #2

    Yes, this could be done entirely in userspace (with something like 0MQ as
    I see others mentioning), and I don't understand the Android aversion to
    any userspace daemons, but with all of that being said, I do think that a
    kernel-based mechanism that supports having iptables type filters on it
    would be a very nice thing to have (and should be able to re-use a lot of
    existing code that would end up being duplicated if this is done in a
    userspace daemon)

    now it may be that some of the requirements may result in error O_PONY or
    O_SANITY (the sender blocking seems like a potential problem, but that
    may possibly make sense as a configurable option)

    David Lang

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