From: Marcel Holtmann <marcel@holtmann.org>
To: BlueZ development <bluez-devel@lists.sourceforge.net>
In-Reply-To: <200701081837.04388.dgollub@suse.de>
References: <200701081837.04388.dgollub@suse.de>
Date: Mon, 15 Jan 2007 14:30:26 +0100
Message-Id: <1168867826.5728.14.camel@violet>
Mime-Version: 1.0
Subject: Re: [Bluez-devel] Should hcid wait for dbus daemon?
Reply-To: BlueZ development <bluez-devel@lists.sourceforge.net>
Content-Type: text/plain; charset="us-ascii"
Sender: bluez-devel-bounces@lists.sourceforge.net
Errors-To: bluez-devel-bounces@lists.sourceforge.net

Hi Daniel,

> the hcid daemon aborts when there is no dbus daemon running. What about 
> enhancing hcid to handle the case that the dbus daemon get started after 
> hcid. I know there are might be not many use cases. But at least i know one 
> case ;)
> 
> To avoid that there is another "unneeded" service running, i want to call only 
> the bluetooth init scripts when there is a bluetooth device plugged in. This 
> is done by a simple udev rule, which calls the bluetooth init script when the 
> device got plugged in.
> 
> So there is no need to insserv or do any other stuff like running YaST or 
> something like that. Just turn on the bluetooth device or plug it in and the 
> bluetooth service get started by udev.
> 
> The only problem is during boot. udev get started before the dbus daemon, and 
> will trigger the udev rule which calls the bluetooth init script. Then hcid 
> will fail because the dbus daemon isn't started in this early stage of boot.
> 
> If the hcid would wait for the dbus daemon this wouldn't be a problem. At 
> least hcid can handle a dbus daemon restart, maybe we can enhance this.
> 
> I know this can be also done in the bluetooth init script, but maybe someone 
> else insist on this enhancement.

I don't think that it is a good idea to have udev start daemons. My
understanding is that udev is for creating device nodes or init
hardware. In case of BlueZ it must start a number of daemons to have a
fully working Bluetooth setup. This task is better done by systems like
upstart which handle dependencies.

Regards

Marcel


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