From mboxrd@z Thu Jan 1 00:00:00 1970 X-Msuck: nntp://news.gmane.io/gmane.comp.sysutils.supervision.general/1914 Path: news.gmane.org!not-for-mail From: Laurent Bercot Newsgroups: gmane.comp.sysutils.supervision.general Subject: Re: Please review my Bluetooth run script Date: Thu, 14 Aug 2008 11:47:16 +0200 Message-ID: <20080814094716.GA32277@skarnet.org> References: <1775.124.170.84.119.1218624530.squirrel@www.magtech.com.au> <20080813120505.GA11751@skarnet.org> <48A38C6D.9070204@magtech.com.au> NNTP-Posting-Host: lo.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Trace: ger.gmane.org 1218707262 24163 80.91.229.12 (14 Aug 2008 09:47:42 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Thu, 14 Aug 2008 09:47:42 +0000 (UTC) To: supervision@list.skarnet.org Original-X-From: supervision-return-2149-gcsg-supervision=m.gmane.org@list.skarnet.org Thu Aug 14 11:48:34 2008 Return-path: Envelope-to: gcsg-supervision@gmane.org Original-Received: from antah.skarnet.org ([212.85.147.14]) by lo.gmane.org with smtp (Exim 4.50) id 1KTZQw-0002lk-TH for gcsg-supervision@gmane.org; Thu, 14 Aug 2008 11:47:54 +0200 Original-Received: (qmail 4020 invoked by uid 76); 14 Aug 2008 09:47:17 -0000 Mailing-List: contact supervision-help@list.skarnet.org; run by ezmlm List-Post: List-Help: List-Unsubscribe: List-Subscribe: List-Archive: Original-Received: (qmail 4009 invoked by uid 1000); 14 Aug 2008 09:47:16 -0000 Mail-Followup-To: supervision@list.skarnet.org Content-Disposition: inline In-Reply-To: <48A38C6D.9070204@magtech.com.au> User-Agent: Mutt/1.4i Xref: news.gmane.org gmane.comp.sysutils.supervision.general:1914 Archived-At: > We're running an embedded Linux system, so I was trying to keep the > number of running processes to a minimum. I guess the runsv is fairly > light? Ah, it's good too see that embedded developers use smart supervision systems and good-quality, small-sized, software. :) The runsv process is quite light, you don't need to worry about it. To be convinced, compile runit statically with the small libc of your choice, and look at the size of the executables and the memory footprints. Note: if you're not using logging at all, and you need to optimize as much as you can, you might consider switching to daemontools. runsv embeds the logging facility, while supervise does not, so I think supervise should be a bit lighter. But it's a very minor optimization, and sticking to runit might give you more benefits. > So are you recommending that I use a Sys-V script to start all the runsv > services? I'm certainly not advocating a SysV scheme. Actually I'm not advocating any scheme at all. A simple one-time script will do. The SysV stuff is an overcomplicated way of running one-time scripts. :) > I currently use UDEV to do an "sv up bluetooth" when the Bluetooth > device is inserted. I guess I could just as easily do "sv up hcid; sv up > sdpd; ... ". > > No-one actually calls "sv down" because it's an embedded system with no > physical user interface, the services are only stopped when the device > is power cycled, which is fairly common and expected. Well, as I understand it, you want to start your Bluetooth daemons as soon as your embedded thingie is powered: then you don't need to write any script at all. Just have your Bluetooth service directories, with appropriate run scripts, in /var/service or wherever runsvdir is run. runsvdir will spawn runsv processes, which will automatically start your daemons (unless you have "down" files in the service directories). If you need to send rfcomm commands, perform them in the one-time initialization (i.e. /etc/runit/1), since rfcomm is a short-lived program. If you need to send them _after_ the daemons are up, it's a bit trickier; but you should already have devised a way to execute a one-time script once the services have been started, just add your rfcomm lines to that script. -- Laurent