[systemd-devel] Detecting failed units based on active state

[David.Yates at continental-corporation.com]

Hi,



We have written a component that detects failing units in the system. This 
registers for the PropertiesChanged signal, to be notified whenever the 
ActiveState of a unit changes.

However this signal is sent without the property values. This can result 
in a problem when a unit is restarted fast (i.e. RestartSec=0) because we 
miss the "FailedState" and can not distinguish between a failed unit and a 
unit that was intentionally stopped and restarted.

We looked at using the InactiveEnterTimestamp however there we also can 
not make the distinction.

Does anyone have any ideas on how we could handle this problem (i.e. other 
properties that could be used)?

In case there is no solution we wondered about introducing a new property 
(UnitFailedCount) to track the number of failures within the current 
lifecycle. Any thoughts??




Thanks


Dave
 

Software Architect System Software

I IC RD G SW SSW HKT
Continental Automotive GmbH
Interior Infotainment & Connectivity
Philipsstrasse 1, 35576 Wetzlar, Germany

Telefon/Phone: +49 6441 370-8289
Mobile/Handy: +49 151 6522 9102
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