linux-kernel - Re: [PATCH 01/13] kdbus: add documentation

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Message-ID: <54C66F30.8050108@gmail.com>
Date:	Mon, 26 Jan 2015 17:45:36 +0100
From:	"Michael Kerrisk (man-pages)" <mtk.manpages@...il.com>
To:	Tom Gundersen <teg@...m.no>
CC:	mtk.manpages@...il.com,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Daniel Mack <daniel@...que.org>, Arnd Bergmann <arnd@...db.de>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>,
	Jiri Kosina <jkosina@...e.cz>,
	Andy Lutomirski <luto@...capital.net>,
	Linux API <linux-api@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	David Herrmann <dh.herrmann@...il.com>,
	Djalal Harouni <tixxdz@...ndz.org>,
	Johannes Stezenbach <js@...21.net>,
	Theodore T'so <tytso@....edu>,
	christoph Hellwig <hch@...radead.org>
Subject: Re: [PATCH 01/13] kdbus: add documentation

On 01/26/2015 04:26 PM, Tom Gundersen wrote:
> Hi Michael,
> 
> On Mon, Jan 26, 2015 at 3:42 PM, Michael Kerrisk (man-pages)
> <mtk.manpages@...il.com> wrote:
>> 2. Is the API to be invoked directly by applications or is intended to
>>    be used only behind specific libraries? You seem to be saying that
>>    the latter is the case (here, I'm referring to your comment above
>>    about sd-bus). However, when I asked David Herrmann a similar
>>    question I got this responser:
>>
>>       "kdbus is in no way bound to systemd. There are ongoing efforts
>>        to port glib and qt to kdbus natively. The API is pretty simple
>>        and I don't see how a libkdbus would simplify things. In fact,
>>        even our tests only have slim wrappers around the ioctls to
>>        simplify error-handling in test-scenarios."
>>
>>    To me, that implies that users will employ the raw kernel API.
> 
> The way I read this is that there will (probably) be a handful of
> users, namely the existing dbus libraries: libdus, sd-bus, glib, Qt,
> ell, and maybe a few others. However, third-party developers will not
> know/care about the details of kdbus, they'll just be coding against
> the dbus libraries as before (might be minor changes, but they
> certainly won't need to know anything about the kernel API). Similarly
> to how userspace developers now code against their libc of choice,
> rather than use kernel syscalls directly.

Thanks, Tom, for the input. I'm still confused though, since elsewhere
in this thread David Herrmann said in response to a question of mine:

    I think we can agree that we want it to be generically useful, 
    like other ipc mechanisms, including UDS and netlink.

Again, that sounds to me like the vision is not "a handful of users".
Hopefully Greg and David can clarify.

Thanks,

Michael


-- 
Michael Kerrisk
Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/
Linux/UNIX System Programming Training: http://man7.org/training/
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