[Simh] Unattended background SIMH process

[Kevin Handy]

The best way is probably to pass a power-fail interrupt to the emulated OS,
and have it set up to deal with that. I'm now sure how many of the OS's
available under simh emulation have such facilities.

An option would be to have a simh command, like
ONSHUTDOWN <silename>
where a simh script is executed when a shutdown interrupt occurs on the
host OS. This may nor be as useful, as the consol may not be in a state to
handle command input at any moment (not logged out, or sitting at a shell
prompt).

Most of the time, though, I don't get any warning anyway (someone trips
over the power cord).


On Thu, Nov 28, 2019 at 10:54 PM Supratim Sanyal <supratim at riseup.net>
wrote:

> My SIMH VAX is behind a reliable IDS/IPS, so I wrote a stupid program to
> do a "RUN SYS$SYSTEM:OPCCRASH" when a TCP connection is made to a specific
> port. It's at QCOCAL::REMOTE-SHUTDOWN-LISTENER.ZIP if you are on HECnet. An
> obvious minimum improvement would be to support some sort of port-knocking.
>
> Best,
> Supratim
>
> On 11/29/2019 12:38 AM, Lars Brinkhoff wrote:
>
> 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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>
> --
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