> actually what you suggested is in use now ;-). firstly, the code use
> daemonize() to become kernel thread, then execute userspace code
> (shutdown/poweroff/halt...). if that failed (for example in case there
> is no such userspace binary), sys_reboot is called.
Yeah, I just looked at the code and realised I was just spouting rubbish 
earlier :-)
> i dont see why we try to call userspace comand first, then fail thru
> to sys_reboot(). why just call sys_reboot()?
As Jeremy said, the reboot command does rather more than just call sys_reboot. 
The sys_reboot call means "really reboot now", without doing the nice things 
init does (unmounting filesystems, stopping processes politely, etc).
I think there must be another way of achieving this effect without exec-ing 
things, though.
Cheers,
Mark
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