select() / inotify / sysfs

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All,

I've discovered that my physical environment causes intermittent wifi connectivity (drops for a few seconds, then returns). My program can work through this, but needs to know that the connection has been interrupted.

I've placed a watch on different files in /sys/class/net/ath0/* and found that operstate changes (from 'up' to 'down') when I experience these network drops. So, I used inotify to detect changes to the file as a proof of concept:

# inotifywatch -v -r /sys/class/net/ath0/operstate

No go. It detects when I cat the file, but doesn't detect when the kernel changes it (which make sense on an academic note, since it doesn't have a value until it's read by userspace).

So, does anyone know of a good (hopefully select() based) method to detect this change? It doesn't have to use sysfs, that's just the dragon I'm chasing right now. ;-) I'd really prefer not to poll the file...

tia,

Jason.
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