From owner-freebsd-hackers@FreeBSD.ORG  Tue Aug 14 21:46:02 2012
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Date: Tue, 14 Aug 2012 14:46:01 -0700
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From: Adrian Chadd <adrian@freebsd.org>
To: Konstantin Belousov <kostikbel@gmail.com>
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Cc: freebsd-hackers@freebsd.org, Dan Plassche <dplassche@gmail.com>
Subject: Re: FreeBSD 1.x Binaries Work Except under Chroot
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Could you do something dirty that lets you reserve PIDs between 0 ..
65534 and then mark a jail as having PIDs only in that space?

That way you could run FreeBSD 1.x and 2.x (?) jails with this
particular flag set and all processes inside it would use that. (Then
handle PID_MAX right for "no process group".)

Dirty, but maybe?



Adrian