How can I send a signal from a python program?

Question

I have this code which listens to USR1 signals

import signal import os import time  def receive_signal(signum, stack):     print 'Received:', signum  signal.signal(signal.SIGUSR1, receive_signal) signal.signal(signal.SIGUSR2, receive_signal)  print 'My PID is:', os.getpid()  while True:     print 'Waiting...'     time.sleep(3) 

This works when I send signals with kill -USR1 pid

But how can I send the same signal from within the above python script so that after 10 seconds it automatically sends USR1 and also receives it , without me having to open two terminals to check it?

Answer 1

You can use os.kill():

os.kill(os.getpid(), signal.SIGUSR1) 

Put this anywhere in your code that you want to send the signal from.