[Simh] Unattended background SIMH process

[Jason Stevens]

I wonder if you could set the console port to listen on a named pipe, and then use expect to connect and execute scripts?

That way you can use one to setup the boot environment from PROM (if needed) boot, then once it’s booted, you can ‘login’ and then execute scripts to check system/network status, then another to shut it down?

I’ve been driving TME on Windows 10 using the Linux subsystem with a named pipe to talk to it, and it seems okay enough, as I really have no other way to interact with the ‘serial’ console, and doing this allows me to nohup it, and talk to it as I want to.. Especially as the NIC that TME emulates isn’t supported by SunOS 2.0

From: Lars Brinkhoff
Sent: Friday, November 29, 2019 1:39 PM
To: simh at trailing-edge.com
Subject: Re: [Simh] Unattended background SIMH process

Seth J. Morabito wrote:
> Has anyone got a clean solution for running a background SIMH process
> that doesn't involve `screen` or `tmux`?

I have also been in search of a solution for this.  I'm OK with using
screen if necessary.

> I would like to create an init script or systemd module that will kick
> off a simulator as a daemon process that can start up on host boot, and
> shut down on host shutdown.

It's the shutting down part that's the problem for me.  The operating
systems I'm interested need to have a user login and type a command to
shut down cleanly.  This is hard to do reliably.

Possible workarounds for this include abusing the hardware power fail
interrupt to initiate shutdown, or listening for a signal from the
network.

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