Date: Mon, 18 Apr 2011 13:52:15 +0200 From: rank1seeker@gmail.com To: freebsd-hackers@freebsd.org Subject: Re: Add SUM sysctl Message-ID: <20110418.115215.546.1@DEV> In-Reply-To: <E1QBQoh-000EDX-AP@kabab.cs.huji.ac.il> References: <8CDCA9824BFE47E-176C-A720@web-mmc-d04.sysops.aol.com> <alpine.BSF.2.00.1104161634150.5936@wonkity.com> <20110416233839.GA72223@DataIX.net> <E1QBQoh-000EDX-AP@kabab.cs.huji.ac.il>
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I would like, to thank you all, for your ideas.=0D=0A=0D=0AThere are 2 ways =
of going into SUM (Single user mode)=0D=0A1) Rebooting into it=0D=0A2) =
Drop from MUM=0D=0A=0D=0AMy solution MUST cover both cases, of entering =
into SUM.=0D=0A=0D=0AOnce I enter SUM, I set it up, via 1 script, which =
enables deamons and other stuff, that I need, for certain task. (i.e; I =
wana use mouse, so I activate moused ...)=0D=0ANow, after those steps, if =
that machine is web server, which serves only static content, then =
enabling apache, makes it fully functional server, in SUM!=0D=0AI see =
now, that both SUM and MUM define BOOTED/STARTED/RUNNING FreeBSD. -> =
Thx, to Daniel O'Connor, for pointing into this direction.=0D=0ASo SUM =
defines basic functionality and MUM ...=0D=0ASo where is a BORDER of SUM =
and MUM. How many "stuff" has to be enabled/activated to decalre it as =
MUM, instead of SUM?=0D=0AWhere does exactly SUM, becomes MUM. As long as =
kernel is being asked, it doesn't differentiate between SUM and =
MUM.=0D=0AKernel "sees" amonut of "pressure" induced by deamones, users, =
processes.=0D=0A=0D=0ANow to cut that chatter short, to solution =
...=0D=0A=0D=0AI've tried by looking at init state:=0D=0A# ps -U root | =
grep 'init -s'=0D=0ABUT, after exiting into MUM, from SUM:=0D=0ASUM->MUM =
(/sbin/init -s) 'init -s' remained.=0D=0AIf sys booted directly into MUM, =
I see (/sbin/init --), which also remains upon drop to SUM.=0D=0ASo init =
state can only be used, to determine, how sys has been =
booted/started.=0D=0A=0D=0ATo cut it even shorter (skipping tried sysctl =
vars, env, etc ...)=0D=0A=0D=0A=0D=0ASolution, which passed my =
requirement, was one from J. Hellenthal's advice.=0D=0AThx!=0D=0AIt =
works, with both cases of entering into SUM.=0D=0AAlso covers case, where =
I enable stuff, that I need in SUM and which could confuse function, into =
thinking it is in MUM.=0D=0A=0D=0A=0D=0AHere is an resulting function: =
(/bin/sh)=0D=0A--=0D=0A# Are we in a SUM=0D=0Ain_sum ()=0D=0A{=0D=0A =
if [ "`/bin/pgrep -x getty`" ]; then=0D=0A return 1=0D=0A =
else=0D=0A return 0=0D=0A =
fi=0D=0A}=0D=0A--=0D=0A=0D=0A=0D=0ADomagoj Smol=E8i=E6=0D=0A
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