init(8) in jails?
Dag-Erling Smørgrav has posted a discussion on FreeBSD-arch (I have to use a outside link instead of FreeBSD’s own mailing list archive, because it didn’t updated from 2004-01-26 for unknown reason), accroding to this post, we see a need of running init(8) in jails, which allows us to terminate a jail cleanly.