search for: reboot_notifi

Thanks, Roger, I thought I was replying to the list, but apparently not. So perhaps this will help someone else who has a similar situation. I wasn't clear enough in my initial question...it isn't so much that I want the status of the UPS, rather I want to know that the Pi is operational again after upsmon has shutdown the Pi and then the UPS has had power restored to it. I created a

....callback = shutdown_handler }; +static struct notifier_block xen_shutdown_notifier = { + .notifier_call = xen_system_reboot, +}; + static int setup_shutdown_watcher(void) { int err; @@ -319,7 +348,11 @@ static int setup_shutdown_watcher(void) return err; } #endif - + err = register_reboot_notifier(&xen_shutdown_notifier); + if (err) { + pr_warn("Failed to register shutdown notifier\n"); + return err; + } return 0; } -- 1.8.3.1