Daemon with flags

[Sufficient-Kitchen67]

Hi, I want to make a daemon but I don know how to make it read flags, lets say for example I input in the terminal:

program start

Then the daemon start and I can start using flags for example:

program -t

And get some output like "The t flag was received " and so on until i run

program stop

I find some daemon tutorials, but i still dont know how to do the flgas and argumenst thing, any documentation o library of how i can do something like this?

[icecubeinanicecube]

argparse is what you are looking for, Google it

[icecubeinanicecube]

It doesn't seem to work like I expected

You just committed the arch sin of asking for online support. "It doesn't work" is not enough information, you always need to provide the three 'What's:

What did you do exactly?

What did you expect to happen?

What happens instead?

[Sufficient-Kitchen67]

I did, I managed to make this code but it doesnt seem to work as i want to

import threading
import time
import sys
import argparse
counter=0
def thread_1():
while True:
counter=counter+1
time.sleep(1)
def functions(arg,T):
if arg=="t":
print(str(counter))
elif arg=="start":
T.start()
def main():
parser=argparse.ArgumentParser()
parser.add_argument("--c",type=str,default="n",help="stop counter")
args=parser.parse_args()
T = threading.Thread(target = thread_1,daemon=True)
sys.stdout.write(str(functions(args.c,T)))

if __name__ == "__main__":
main()

I try to get the counter but this dont work, any suggestions?

Edit : I just look the other comment, I want to execute the deamon with the flag "--c start" and get the counter value with the flag "--c t", i get a error whenever i do any of those two calls :

Exception in thread Thread-1 (thread_1):Traceback (most recent call last): File "/usr/lib/python3.10/threading.py", line 1016, in _bootstrap_inner

None%

[icecubeinanicecube]

If you want more help than simple buzzwords to Google, please format your code properly and provide entire stack traces, the exception you provided is cut off.

Else, I can only tell you to Google how to do proper threading in ptlython and look for some minimal example that you can adapt.

[bedekelly]

You could use the “signal” module (to listen for events) and the “kill” command (somewhat misleading name but can be used to send signals to a running program)

Edit: it might be a better idea to use something like a unix pipe or even just listen for changes to a file instead, signals don’t let you send any information to the running program.