linux-kernel - Re: [GIT PULL] kdbus for 4.1-rc1

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Message-ID: <CAEntwhFkkzEYyuS7N=P=PJs=Hsizzo_k2+GgsOd562argYDecw@mail.gmail.com>
Date:	Wed, 15 Apr 2015 13:41:10 -0400
From:	Havoc Pennington <hp@...ox.com>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Borislav Petkov <bp@...en8.de>,
	Richard Weinberger <richard@....at>,
	Andy Lutomirski <luto@...capital.net>,
	Al Viro <viro@...iv.linux.org.uk>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Arnd Bergmann <arnd@...db.de>,
	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>,
	Tom Gundersen <teg@...m.no>, Jiri Kosina <jkosina@...e.cz>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Daniel Mack <daniel@...que.org>,
	David Herrmann <dh.herrmann@...il.com>,
	Djalal Harouni <tixxdz@...ndz.org>
Subject: Re: [GIT PULL] kdbus for 4.1-rc1

On Wed, Apr 15, 2015 at 1:20 PM, Steven Rostedt <rostedt@...dmis.org> wrote:
> I read a bit of the documentation, but not enough. I really need to sit
> down and play with code. That's the way I learn and understand.
>

It might be useful for some of the current devs to post about the best
APIs to play with these days - my old libdbus is pretty painful,
compared to some of the newer stuff.

gdbus nicely shows a callback-based way to handle owning a service,
using a function like g_bus_own_name:

https://developer.gnome.org/gio/stable/gio-Owning-Bus-Names.html#g-bus-own-name

The callback-based approach means the library can handle
reconnection/restart on behalf of the app.

The flip side (the way you use rather than provide a service) looks similar:
 https://developer.gnome.org/gio/stable/gio-Watching-Bus-Names.html#g-bus-watch-name

Here the library can deal with complexities of a service being
restarted, the app only has to write the callbacks so they can be
called more than once (with alternating appeared/vanished handlers).

You can see in those API docs more of the ordering guarantees, in this
case on callback invocation - less for apps to screw up.

Havoc
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