["python","daemon","sigterm","start-stop-daemon"]
How to process SIGTERM signal gracefully?

Let's assume we have such a trivial daemon written in python: def mainloop(): while True: # 1. do # 2. some # 3. important # 4. job # 5. sleep mainloop() and we daemonize it using start-stop-daemon which by default sends SIGTERM (TERM) signal on --stop. Let's suppose the current step performed is #2. And at this very moment we're sending TERM signal. What happens is that the execution terminates immediately. I've found that I can handle the signal event using signal.signal(signal.SIGTERM, handler) but the thing is that it still interrupts the current execution and passes the control to handler. So, my question is - is it possible to not interrupt the current execution but handle the TERM signal in a separated thread (?) so that I was able to set shutdown_flag = True so that mainloop() had a chance to stop gracefully?
A class based clean to use solution: import signal import time class GracefulKiller: kill_now = False def __init__(self): signal.signal(signal.SIGINT, self.exit_gracefully) signal.signal(signal.SIGTERM, self.exit_gracefully) def exit_gracefully(self, signum, frame): self.kill_now = True if __name__ == '__main__': killer = GracefulKiller() while not killer.kill_now: time.sleep(1) print("doing something in a loop ...") print("End of the program. I was killed gracefully :)")