How to process SIGTERM signal gracefully?

Question

Let\'s assume we have such a trivial daemon written in python:

def mainloop():
    while True:
        # 1. do
        # 2. some
        # 3. important
              


        

Answer 1

Here is a simple example without threads or classes.

import signal

run = True

def handler_stop_signals(signum, frame):
    global run
    run = False

signal.signal(signal.SIGINT, handler_stop_signals)
signal.signal(signal.SIGTERM, handler_stop_signals)

while run:
    pass # do stuff including other IO stuff