[systemd-devel] suspend/resume hooks, the right way

[Lennart Poettering]

On Fri, 25.09.15 22:17, Łukasz Stelmach (stlman at poczta.fm) wrote:

> Hi,
> 
> systemd-sleep(8) states
> 
>        Note that scripts or binaries dropped in /usr/lib/systemd/system-sleep/
>        are intended for local use only and should be considered hacks. If
>        applications want to be notified of system suspend/hibernation and
>        resume, there are much nicer interfaces available.
> 
> What is the right way to hook some oneshot services like battery status
> monitor[1] into systemd so they get executed as pre-sleep and
> post-resume (or more specifically (pre|post)-(suspend|hibernate|hybrid-sleep)
> if possible) hooks? 

Applications should use suspend delay inhibitors in logind so that
they get a certain amount of time to whatever they want to do before
the system goes to sleep.

https://wiki.freedesktop.org/www/Software/systemd/inhibit/

> Then, does any part of systemd (package) react to plugging and
> unplugging DC jack into a laptop?

I think you get an uevent for this, hence you could do it via udev
rules, no?

Lennart

-- 
Lennart Poettering, Red Hat