I was trying to find out what commands are possible to send to service, but it's man page lists only "start|stop|etc.". Was told rc.subr(8) contains it. Would be good if that is mentioned in the service man page.
service(1) references rc(8) which has the standard commands. rc(8) itself references rc.subr(8) which contain the implementation details. A direct cross-reference would not help much. (given that it is cheap to add a xref, if someone feels strongly about it, I will add it, but this is a soft close)