Re: Python script as background process

Hello bpryer

I spent some time tonight trying to solve your problem.

I made a python example "blink.py" which blink the on-board led on the Arduino breakout board

#!/usr/bin/python
import mraa
import time

x = mraa.Gpio(13)
x.dir(mraa.DIR_OUT)

while True:
    x.write(1)    time.sleep(0.5)    x.write(0)    time.sleep(0.5)

I thought at first than the method described here would work:

http://serverfault.com/questions/34750/is-it-possible-to-detach-a-process-from-its-terminal-or-i-should-have-used-s

However, "disown" does not exist on Yocto

I found a solution using "systemctl"

some info here : Re: Startup scripts on Edison

What I did is create a blink service "/lib/systemd/system/blink.service" with this content :

After that you have to reload your services with

systemctl daemon-reload

and then you can start or stop your program with

systemctl start blink

systemctl stop blink

When it is started, it will continue to run even after you terminate you SSH session.

You can also make it auto-start at boot with

systemctl enable blink

To see if your process is running and/or enabled use

systemctl status blink

I hope it helps!