import signal
import os

got_signals = 0

def handler(signum, frame):
    global got_signals
    got_signals += 1

signal.signal(signal.SIGALRM, handler)

fd = os.open(__file__, os.O_RDONLY)

signal.setitimer(signal.ITIMER_REAL, 0.001, 0.001)
for i in range(10**7):
    os.set_inheritable(fd, True)
    os.set_inheritable(fd, False)
signal.setitimer(signal.ITIMER_REAL, 0, 0)

print("got %s signals" % got_signals)
os.close(fd)