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# Test the signal module
import signal
import os
pid = os.getpid()
# Shell script that will send us asynchronous signals
script = """
(
set -x
sleep 2
kill -5 %(pid)d
sleep 2
kill -2 %(pid)d
sleep 2
kill -3 %(pid)d
) &
""" % vars()
def handlerA(*args):
print "handlerA", args
HandlerBCalled = "HandlerBCalled" # Exception
def handlerB(*args):
print "handlerB", args
raise HandlerBCalled, args
signal.alarm(20) # Entire test lasts at most 20 sec.
signal.signal(5, handlerA)
signal.signal(2, handlerB)
signal.signal(3, signal.SIG_IGN)
signal.signal(signal.SIGALRM, signal.default_int_handler)
os.system(script)
print "starting pause() loop..."
try:
while 1:
print "call pause()..."
try:
signal.pause()
print "pause() returned"
except HandlerBCalled:
print "HandlerBCalled exception caught"
except KeyboardInterrupt:
print "KeyboardInterrupt (assume the alarm() went off)"
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