micropython-lib/unix-ffi/signal/example_sigint.py

import time
from signal import *

quit = 0


def handler(signum):
    global quit
    quit = 1
    print("Signal handler called with signal", signum)


print("org signal() val:", signal(SIGINT, handler))
print("read back signal() val:", signal(SIGINT, handler))

while not quit:
    time.sleep(10)

print("Quitting...")