Re: Let init know user wants to shutdown

[John Fremlin <chief@bandits.org>]

 "Grover, Andrew" <andrew.grover@intel.com> writes:

> Hi Pavel,
> 
> I think init is doing a perfect job WRT UPSs because this is a
> trivial application of power management. init wasn't really meant
> for this.  According to its man page:
> 
> "init...it's primary role is to create processes from a script in
> the file /etc/inittab...It also controls autonomous processes
> required by any particular system"
> 
> We are going to need some software that handles button events, as
> well as thermal events, battery events, polling the battery, AC
> adapter status changes, sleeping the system, and more.

Dealing with events should be disjoint from polling the battery or
powerstatus. Many processes might reasonably simultaneously want to
provide a display to the user of the current power status.

However, button presses and so on should be handled by a single
process. Otherwise the kernel is unreasonably complicated by having to
deal with multiple processes' veto power, which could just as well and
more flexibly be handled in userspace.

I don't why there needs to be an additional daemon constantly running
to deal with button presses and power status changes. Apparently init
is already handling similar things: why should it not be extended to
include button presses?

Alternatively, why not forgo a daemon altogether? (This scheme is
already implemented in the pmpolicy patch, i.e. it is already
working.)

> We need WAY more flexibility than init provides. 

Examples please.

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