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From: Malcolm McLean <malcolm.arthur.mclean@gmail.com>
Newsgroups: comp.lang.c
Subject: Re: Running an editor from ANSI C
Date: Sat, 8 Jun 2024 22:01:23 +0100
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On 08/06/2024 19:07, Kaz Kylheku wrote:
> On 2024-06-08, Malcolm McLean <malcolm.arthur.mclean@gmail.com> wrote:
>> On 08/06/2024 01:32, Kaz Kylheku wrote:
>>> Bug I take it that by shell you mean something which is primarily a
>>> command interpreter for driving an operating system, not an adventure
>>> game engine, or sophsticated programming language run-time.
>>>
>> It calls system so that real users can use it for real.
> 
> User wants to run their program in the background, and so using
> their knowledge of the host's actual shell, does this:
> 
>    > system ./simulation --duration 1h &
> 
> Now what?
> 
I don't have a clue. In the Baby X shell, you know you are in the shell 
because you have the BBX$ prompt intead of your regular prompt. But 
typing "system ..." will effectively be the same as typing "..." at the 
prompt when you are out of the BBX$ shell. Except that anything will be 
spawned by a child process instead of your own shell directly. Now if 
that is a problem for the host operating system, Baby X just can't 
accept responsibility. But you might be able to type somthing which will 
destabilise the OS whilst at the BBX$ prompt and typing "system bad" 
instead of "bad" at your regular prompt, which would be unfortunate.

-- 
Check out Basic Algorithms and my other books:
https://www.lulu.com/spotlight/bgy1mm