tree f2fe2a9d9fb6733c32e1d558d09f5b2da6638845
parent ac37297dd327028f8ac41e4459eeb539144292a6
author Matt Spinler <spinler@us.ibm.com> 1611249333 -0600
committer Matt Spinler <spinler@us.ibm.com> 1612798929 -0600

sensor-mon: Create sensor-monitor application

This is a new application that will be used to take actions based on
sensor values or sensor threshold alarm values.  It's not built unless
the --enable-sensor-monitor option is used.

The first behavior will be to do power offs and create event logs based
on the xyz.openbmc_project.Sensor.Threshold.HardShutdown and
SoftShutdown threshold interfaces that may be present on sensor object
paths.  It will watch the high and low alarm properties on those
interfaces.  This could then be used to power off the system after some
delay if some sensor value gets too high or low, such as a high ambient
or a low voltage.

This first commit in the series creates the application and a new
ShutdownAlarmMonitor class, which is where the monitoring will happen.
Initially, it just finds all existing soft and hard shutdown interfaces
on D-Bus and puts them in a map.  It also registers for properties
changed signals for those interfaces.

Note that the interfacesAdded signal doesn't need to be used because all
sensor applications today emit propertiesChanged signals when they first
start up anyway.

Signed-off-by: Matt Spinler <spinler@us.ibm.com>
Change-Id: Ia5b82fcbe32f65d94b23bf26a025202a7f885183