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From: Jim Jackson <jj@franjam.org.uk>
Newsgroups: comp.unix.programmer
Subject: Re: Faking a TTY on a pipe/socketpair
Date: Mon, 9 Dec 2024 20:28:31 -0000 (UTC)
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On 2024-12-05, Lawrence D'Oliveiro <ldo@nz.invalid> wrote:
> On Thu, 5 Dec 2024 08:19:46 -0000 (UTC), Muttley wrote:
>
>> On Thu, 5 Dec 2024 02:11:04 -0000 (UTC)
>> Lawrence D'Oliveiro <ldo@nz.invalid> wibbled:
>>>
>>>On Wed, 4 Dec 2024 08:34:30 -0000 (UTC), Muttley wrote:
>>>
>>>> Linux is far closer to the unix philosphy (ignoring systemd) ...
>>>
>>>Which ???unix philosophy??? would that be?
>> 
>> The one where init does a single task instead of spreading itself
>> throughout the system ...
>
> What ???single task??? did init do?
>
> * Mount filesystems
> * Spawn syslog, cron
> * Spawn terminal login processes (getty)
> * Respawn terminated getty processes
> * Monitor other special stuff in inittab
> * Spawn random other services, without monitoring their state
> * Act as a general catch-all for orphaned processes when they terminate
>
> This was all before systemd came on the scene.

Actually traditional Unix "init" didn't do ALL those things. Most tended 
to have the inittab config file. Even busybox's init has.

I can't think of a pre-systemd init that mounted filesystems, or spawned 
things like syslog/cron. It ran other programs/systems that did most of 
system-bring-up and the process control stuff one of which was SysV 
initialise setup. Which, surprize though this might sound to some 
people, was, at the time, an improvement on the startup setups that had 
been common previously.