On Sun, Jun 14, 2020 at 6:19 PM Pete Biggs <pete@xxxxxxxxxxxx> wrote:
>
> > I'm quite sure that in original Berkeley Unix, as on the VAX 11/780, halt
> > was an immediate halt of the CPU without any process cleanup or file
> system
> > umounting or anything. Early SunOS (pre-Solaris) was like this, too.
> >
> The SunOS 4.1.2 man page for halt says
>
> NAME
> halt - stop the processor
> SYNOPSIS
> /usr/etc/halt [ -oqy ]
> DESCRIPTION
> halt writes out any information pending to the disks and then
> stops the processor.
> halt normally logs the system shutdown to the system log
> daemon, syslogd(8), and places a shutdown record in the
> login accounting file Ivar/admlwtmp.
> These actions are inhibited if the -0 or -q options are present.
>
> The BSD 4.3 (that ran on VAXen) man pages say largely similar things:
>
>
> https://www.freebsd.org/cgi/man.cgi?query=halt&apropos=0&sektion=0&manpath=4.3BSD+Reno&arch=default&format=html
>
>
ok, so it does a sync then hard halts, but it doesn't gracefully exit
services, or unmount file systems.
--
-john r pierce
recycling used bits in santa cruz
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