> Is there any way to find that the machine is rebooting. ?
>
> Say, i issued a "reboot" command in one of the Konsole shell. Is
> there any way to detect this trigger in kernel space or in userspace ?
> Any clue is really appreciated .
Hi ratheesh,
in the kernel it's pretty easy.
Simply use register_reboot_notifier from kernel/sys.c and you'll get notified
(via a callback you register) when the system gets rebooted.
You can use this stub driver as a reference (not actually tested):
---
#include <linux/module.h>
#include <linux/notifier.h>
#include <linux/reboot.h>
static int my_reboot_callback(struct notifier_block *self,
unsigned long val,
void *data){
if (val == SYS_RESTART)
pr_debug("We're rebooting\n");
return NOTIFY_DONE;
}
static struct notifier_block my_reboot_notifier = {
.notifier_call = my_reboot_callback,
};
static int __init my_reboot_init(void)
{
return register_reboot_notifier(&my_reboot_notifier);
}
static void __exit my_reboot_exit(void)
{
register_reboot_notifier(&my_reboot_notifier);
}
module_init(my_reboot_init);
module_exit(my_reboot_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Peter Huewe <peterhuewe@xxxxxx>");
---
regards,
Peter
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