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[[!meta copyright="Copyright © 2010, 2013 Free Software Foundation, Inc."]]
[[!meta license="""[[!toggle id="license" text="GFDL 1.2+"]][[!toggleable
id="license" text="Permission is granted to copy, distribute and/or modify this
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any later version published by the Free Software Foundation; with no Invariant
Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license
is included in the section entitled [[GNU Free Documentation
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[[!meta title="AF_BUS, D-Bus, and the Linux kernel"]]
Might be interesting to watch how this develops.
[[!toc]]
# IRC, freenode, #hurd, about 2010-08/2010-09
<neal> check this out:
<neal> someone is working on implementing dbus in linux
<neal> linux finally gets mach ipc ;-)
<marcusb> it's old news though, unless there is an update
<marcusb> and I think it was only the client?
<neal> youpi : someone is adding dbus ipc to the linux kernel
<neal> marcusb: I just heard about it.
<youpi> (it's crazy how this drives backward compared to a hurdish approach)
<youpi> what is the motivation for moving to the kernel?
<neal> context switch overhead
<azeem_> they wanna use it to talk to device drivers? :)
<kilobug> well, they did that with the in-kernel web server, but they
abandonned it later on
<neal> azeem: I don't think so.
<neal> dbus in the kernel is actually good for the Hurd as dbus IPC is
basically neutered Mach IPC
<marcusb> I don't think anybody wants to put the dbus server in the kernel
<neal> well, there is at least one person
<marcusb> maybe this is a different news from the one I read
<neal> Alban Crequy (albanc) is working out. He works for collabora, fwiw
<http://alban.apinc.org/blog/2010/09/15/d-bus-in-the-kernel-faster/>
<marcusb> what I read was about hal etc
<marcusb> so that you don't need a user space daemon to glue the kernel to the
dbus world
<neal> I don't think that is what he is talking about
<marcusb> I can't find it anymore though. I mentioned it in this channel at
the time though, so it should be in the backlog
<marcusb> neal, yeah could very well be a separate thing
<marcusb> neal, dbus does have marginal support for fd passing though, and some
attempts on the mailing list to make "fds" an official type in the message
failed (as far as I could see, I didn't read the whole discussion)
<marcusb> so no mach ipc just yet
<neal> wrong
<neal> FD handling is in 1.4
<neal> type o, if I'm not mistaken
<marcusb> then the discussion moved on from initial rejection
<neal> no, 'h'
<marcusb> I'm out of date by two months
<marcusb> ok
<guillem> neal: AFAIR Marcel Holtmann talked about dbus in-kernel several years
ago, but he never ended up implementing it, or there were rumors he had
private "working code"
* Related Mailing List Discussion
* [\[PATCH 0/5\] RFC: Multicast and filtering features on
AF_UNIX](http://article.gmane.org/gmane.linux.kernel/1040481),
2010-09-24
# 2013-02
[AF_BUS, D-Bus, and the Linux
kernel](http://www.kroah.com/log/linux/af_bus.html), Greg Kroah-Hartman,
2013-02-08.
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