690f02f4b8f71b6b1ac84988ebbaf0bd4073c744
In all three cases, sd_event_loop() will return the exit code anyway. If sd_event_loop() returns negative, failure is logged and results in an immediate return. Otherwise, we don't care if sd_event_loop() returns 0 or positive, because the return value feeds into DEFINE_MAIN_FUNCTION(), which doesn't make the distinction.
systemd - System and Service Manager
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