[Bi@tch]

I bought this Backup battery/Power Regulator and it can be connected through USB to the computer to shutdown the computer in case of a power failur.

No drivers are available for mac. So I thought I could program my own.

How hard could that be to write somekind of daemon and how can I do it?

Thanks!

[Angus_D]

How hard? Depends on what the daemon has to do. Writing a daemon that does nothing is trivial. Read the man pages on fork and execv.

[Bi@tch]

Lets say a Daemon that detects the signal sent by the backup battery and launches an Apple Script?

[Angus_D]

Originally posted by Bi@tch:
Lets say a Daemon that detects the signal sent by the backup battery and launches an Apple Script?

"signal"? What is the nature of this "signal" that you speak of?

Launching an AppleScript from a daemon would involve fork()ing again and then you could either execv() your own tool to call the OSA API or just execv() /usr/bin/osascript

So, relatively trivial.

[Bi@tch]

Well the device is connected to the USB port so...it must send some sort of code right?

[sandsl]

I think your trivialising the process of creating a device driver, however I have the following suggestion.

Check Apples Developer site for the 'USBUPSMonitor' sample code, found here:
http://developer.apple.com/samplecod...UPSMonitor.htm

Download, read instructions and compile - providing your power device is USB Power Class-compatible you might be lucky and find it works with your power device. On the other hand it might not work - in this case you have a source code starting point to work from demonstrating how to use daemons, usb interaction, shutting down system etc.

Perhaps there is an open-source unix driver for your particular power device, search sourceforge.net to find out - this would help you.

I'd also suggest you read through the info on apple's developer site about USB devices and device drivers and perhaps buy a book or two.