suspend/resume a process started from ~/.bashrc - bash

Question

I want to start a long-running python process when I log-in to a server.
So I put something like this into ~/.bashrc
python long_running_process.py
This correctly starts the python process on login. The problem here is that I'm not able to suspend it later (with ctrl-z). I can only exit the process by presssing ctrl-c.
I'd like to be able to pause/suspend and resume the python process if possible. This is different from "backgrounding" the process which has been asked and answered here
EDIT: I found a hack that kindof works. I create a dummy shell-script called ~/run.sh and make it executable. Then I put
#!/bin/bash
set -m
python long_running_process.py
in ~/run.sh.
Lastly, I call ~/run.sh in ~/.bashrc instead of starting the python process directly. Giving set -m enables job-control in the script (which is disabled by default for shell-scripts it seems)
This is very hacky. If someone has a nicer/cleaner solution, I'd be very interested in hearing it

Answer 1

You can use POSIX signals, sent with the kill command. I'll run this little Python script that prints its process id and the time once per second, then pause it then resume it:
#!/usr/bin/env python3
import os
import time
while True:
print(f"Process id: {os.getpid()}, time: {int(time.time())}")
time.sleep(1)
It started with process id 63070, so I can pause it with:
kill -STOP 63070
and then resume it with:
kill -CONT 63070

Answer 2

You can stop the process with command kill -SIGSTOP pid where pid is the process id (you can find it with command ps -ef | grep process_name ) and then continue the process with signal SIGCONT.