Zombie process in Thonny

[MarPan71]

Hello.
Why Thonny make zombie process from my daemon script?
When I starting My daemon in Debian11 with Python 3.9.2 everythink is o.k.
If I used to this Thonny interpreter , starting My daemon script = zombie process and exit with error.
System: Raspberry OS based on Debian 11.
Thonny version: 4.1.7
Python version: 3.9.2

[pratikrath126]

Thonny runs user scripts in a separate child process (the backend). If your script forks/daemonizes but doesn't detach correctly or if the parent (Thonny's backend) doesn't wait() on it, you get zombies. Since Thonny controls the lifecycle of the Python process to support debugging/stopping, it might not handle daemonized children the same way a raw shell does. Try ensuring your daemon detach logic includes os.setsid() and double-forking, or check Thonny's 'Run' options to see if 'Run in Terminal' (if available) behaves differently.

[MarPan71]

Thanks for your reply.
The detachment logic involves double-forking and handling via os.setsid().
I tested how to start my daemon using the "run in terminal" option in Thonny's "run" menu. It works fine. It starts the daemon, displays its status, and stops it if I type subsequent invocations of my daemon in the terminal window opened by Thonny.
This method of starting makes it impossible to debug my program with Thonny.
I'm curious how to make Thonny handle the wait() method for my daemon. Is it possible to set such an option?