[systemd-devel] custom var in sd_notify

aleivag aleivag at gmail.com
Sun Feb 25 22:32:50 UTC 2018

Hi all, hope you are doing:

i was toying aroud sd_notify and sd-daemon.h and found this section in
systemd/sd-daemon.h#L234-L235 it said:

Daemons can choose to send additional variables. However, it is recommended
to prefix variable names not listed above with X_.
So naturally i tried

sd_notify(0, "X_ANSWER=42")

and apparently systemd has no problem with that, but my questions are 2 now:

1) What does systemd do with this information?
2) How can i query this x_answer variable i just gave?


Alvaro Leiva
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