Ok I see. I wasn't aware that one sage process
(your "server process") could serve multiple users.
I will wait to see how things develop.
===============================
In the setup I was planning it is definitely not true that any user
can kill
the server process.  I wanted to have a bunch of users, say

sageuser1----sageuser10

each with their own working directory
and running a copy of sage. So there would be (at most) 10 sage
processes.

One controlling process (running as root) would monitor these
sage processes and restart (and kill) them as required.

So sageuser5 would be able to kill sageprocess5 but nothing
else. Moreover sageprocess5 would be restarted immediately.
Everything is fully isolated. No security risk whatsoever.

One would need a system with a lot of memory of course.

Michel












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