Viewing file:  test_signal.py (1.74 KB) -rw-r--r--
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# Test the signal module
from test.test_support import verbose, TestSkipped, TestFailed
import signal
import os, sys, time
if sys.platform[:3] in ('win', 'os2') or sys.platform=='riscos':
raise TestSkipped, "Can't test signal on %s" % sys.platform
if verbose:
x = '-x'
else:
x = '+x'
pid = os.getpid()
# Shell script that will send us asynchronous signals
script = """
(
set %(x)s
sleep 2
kill -HUP %(pid)d
sleep 2
kill -USR1 %(pid)d
sleep 2
kill -USR2 %(pid)d
) &
""" % vars()
def handlerA(*args):
if verbose:
print "handlerA", args
class HandlerBCalled(Exception):
pass
def handlerB(*args):
if verbose:
print "handlerB", args
raise HandlerBCalled, args
signal.alarm(20) # Entire test lasts at most 20 sec.
hup = signal.signal(signal.SIGHUP, handlerA)
usr1 = signal.signal(signal.SIGUSR1, handlerB)
usr2 = signal.signal(signal.SIGUSR2, signal.SIG_IGN)
alrm = signal.signal(signal.SIGALRM, signal.default_int_handler)
try:
os.system(script)
print "starting pause() loop..."
try:
while 1:
if verbose:
print "call pause()..."
try:
signal.pause()
if verbose:
print "pause() returned"
except HandlerBCalled:
if verbose:
print "HandlerBCalled exception caught"
else:
pass
except KeyboardInterrupt:
if verbose:
print "KeyboardInterrupt (assume the alarm() went off)"
finally:
signal.signal(signal.SIGHUP, hup)
signal.signal(signal.SIGUSR1, usr1)
signal.signal(signal.SIGUSR2, usr2)
signal.signal(signal.SIGALRM, alrm)
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