Zbigniew Jędrzejewski-Szmek
7f3614e547
Fixes #13756. We were returning things that didn't make much sense: we would always use the exit_code value as the exit code. But it sometimes contains a exit code from the process, and sometimes the number of a signal that was used to kill the process. We would also ignore SuccessExitStatus= and in general whether systemd thinks the service exited successfully (hence the issue in #13756, where systemd would return success/SIGTERM, but we'd just look at the SIGTERM part.) If we are doing --wait, let's always propagate the exit code/status from the child. While at it, make the documentation useful.
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