python的signal

import signal
import time
flag = True
def func1(a,b):
print "recieve SIGTERM"
global flag
print "flag %s"  % flag
flag=False
print "flag %s" %  flag

def main():
signal.signal(signal.SIGTERM, func1)
while flag:
time.sleep(1)
print "flag %s" % flag

if __name__ == "__main__":
main()