hotplugd - event serializer and multiplexer

[Kay Sievers <kay.sievers@vrfy.org>]

Hi,
I've took our sweet udevd and made a generic hotplug event serializer.
It can replace the current /sbin/hotplug multiplexer bash script.

hotplugsend is invoked by the kernel and sends the data the kernel
provides over a domain socket to the hotplugd daemon. The daemon will
be started if not already running.

The hotplugd daemon reorders the events it receives, handles timeouts if
sequences are missing and executes all programs in /etc/hotplug.d/<subsys>/
thereafter in /etc/hotplug.d/default/ in each case in lexical order.

The programs are executed in the background, but only _one_ program runs
at any time for a single DEVPATH. No longer need for the various 'sleep 2'
all over the scripts. It's possible now to order the programs, so that
udev has already created all nodes, before the scripts are called.
udevd is no longer neccessary, we can call udev directly.

The maximum count of forked processes may be limited and is currently set
to 300.

It doesn't depend on any shell and therefore should be very fast for
a lot of devices connected at once. Hmm, I have only 4 :)

I know that most of us don't like a daemon for general hotplug, but I
wanted to try it. I expect more and more problems with the
syncronization of the hotplug scripts, so this is a possible solution.
No later event will ever beat the earlier for one device.

I've put this together today in 5 hours, so expect a very experimental
piece of code :)

Anybody interested, may look at it here:

  http://vrfy.org/projects/hotplugd/

thanks,
Kay


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