Understanding the timestamp of ltrace

[Franck Youssef]

Hello,

I am trying to generate log traces of err_xact.count myself, using the polygraph-ltrace --objects. 

I would like to sample these values with a sampling interval of 20 seconds. 

To my understanding, that should be feasible with the --time_unit option. However, when running ltrace with different --time_unit values] I always obtain the same output.
Furthermore, when printing the 'time' object using --time_unit 1s, I obtain some kind of a funny timestamp prefixed with a dash: "-2147483620.50"  (= Fri Dec 13 21:46:19 MET 1901 using date -d @…).

What does that timestamp mean, how could I obtain a "natural" unix timestamp and how could I modify the sampling interval?

Best,
Franck

-- 
franck youssef
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