import time
import signal

#clock = time.monotonic_ns
clock = time.perf_counter_ns

def sigint_handler(signum, frame):
    dt = clock() - start
    print("[%.1f] got SIGINT!" % (dt / 1e9))

signal.signal(signal.SIGINT, sigint_handler)

print("sleep 5 seconds... press CTRL+C to interrupt it")
start = clock()
time.sleep(5)
dt = clock() - start
print("dt: %s ns (%.3f sec)" % (dt, dt / 1e9))