Date: Fri, 18 Feb 2005 20:47:01 +0000 (GMT) From: Robert Watson <rwatson@FreeBSD.org> To: Warner Losh <imp@bsdimp.com> Cc: alexjeffburke@gmail.com Subject: Re: single user v multiuser boot Message-ID: <Pine.NEB.3.96L.1050218204506.67347E-100000@fledge.watson.org> In-Reply-To: <20050218.132523.112577260.imp@bsdimp.com>
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On Fri, 18 Feb 2005, Warner Losh wrote: > One can get to single user mode without a fully working vm system. One > can get to single user mode without having process termination working > or image rundown working. Multiuser also requires that the various > synchronization primitives be fully functional. So things like > fork/exec don't have to work completely. Back when /sbin/init and > /bin/sh were statically linked, getting to single user didn't even > require mmap to work correctly. I think the defintions so far have been pretty developer-centric. From a user perspective, the benefit of single user mode is that, other than /sbin/init, /bin/sh, and some /dev entries necessary to launch a process, there are few dependencies to get into a maintenance mode that can be used to partially start the system, perform recovery, etc. I frequently use networking, swap, etc, from single-user, but with single-user you get the choice to say "don't depend on <x>, because it's broke". Robert N M Watson
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