What is rc.d/opensm?

From: Alexander Leidinger <Alexander_at_Leidinger.net>
Date: Fri, 24 Nov 2023 10:20:21 UTC 
Hi,

for my work on service jails (https://reviews.freebsd.org/D40370) I try 
to find out what opensm is. On my amd64 system I don't have a man page 
nor the binary (and man.freebsd.org doesn't know either about opensm).

Bye,
Alexander.

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