Using udev to collect device information

[Eric Munson <ebmunson@us.ibm.com>]

I am working on a project that maintains a list of active hardware on a
 machine and we want to make it hotplug "aware".  Making udev call our
process for adding or removing an entry to or from our list each time
hardware is added or removed seems easy enough, but I have several
questions:

1.  Our system will be thread safe, but if we are calling the hotplug
updater each time a device is added or removed with the rules:
ACTION="add" RUN+="/usr/sbin/program"
and
ACTION="remove" RUN+="/usr/sbin/program"
Are we going to cause serious slow downs for the rest of the system if
we are flooded with adds/removes?  The program that we will be running
won't be terribly slow but it will include some disk IO.

2.  How can I pass information about the event, things like what device
is being added/removed into the program being called?  Does udev provide
any of this information during rule execution (I assume that udev has
it, I just need to know where to get it)?

Sorry if this is a gross abuse of udev, but we are looking to plug into
a "hotplug" like system without requiring our users to install the
linux-hotplug system so if there is a better way to accomplish the same
thing please let me know.

Thanks for your help!
-- 
Eric Munson
ebmunson@us.ibm.com
503.578.3104 T/L 775.3104

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