[systemd-devel] dbus API for unit state change?

[Mantas Mikulėnas]

On Thu, Oct 3, 2013 at 3:06 PM, Lennart Poettering
<lennart at poettering.net> wrote:
> On Thu, 03.10.13 06:05, Mantas Mikulėnas (grawity at gmail.com) wrote:
>> This is already handled by the PropertiesChanged signal in the
>> standard org.freedesktop.DBus.Properties interface. (Although systemd
>> only sends invalidated_properties and the new values have to be
>> retrieved manually, so that's not really perfect yet.)
>
> The latter is going to change soonishly btw. I am currently working on
> adding automatic property handling support to libsystemd-bus. With that
> in place we'll like start sending the actual property contents around
> too, and not just invalidate things.
>
> Client libraries hence need to handle PropertiesChanged signals in full,
> i.e. handle both invalidating messages and the others for the same
> properties even if for now only invalidating messages are sent.

They do, but the state might have changed again between receiving
PropertiesChanged and retrieving the new value.

-- 
Mantas Mikulėnas <grawity at gmail.com>