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# Test the signal module
from 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 -5 %(pid)d
sleep 2
kill -2 %(pid)d
sleep 2
kill -3 %(pid)d
) &
""" % vars()
def handlerA(*args):
if verbose:
print "handlerA", args
HandlerBCalled = "HandlerBCalled" # Exception
def handlerB(*args):
if verbose:
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:
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)"
if hasattr(signal, "sigprocmask"):
class HupDelivered(Exception):
pass
def hup(signum, frame):
raise HupDelivered
def hup2(signum, frame):
signal.signal(signal.SIGHUP, hup)
return
signal.signal(signal.SIGHUP, hup)
if verbose:
print "blocking SIGHUP"
defaultmask = signal.sigprocmask(signal.SIG_BLOCK, [signal.SIGHUP])
if verbose:
print "sending SIGHUP"
try:
os.kill(pid, signal.SIGHUP)
except HupDelivered:
raise TestFailed, "HUP not blocked"
if signal.SIGHUP not in signal.sigpending():
raise TestFailed, "HUP not pending"
if verbose:
print "unblocking SIGHUP"
try:
signal.sigprocmask(signal.SIG_UNBLOCK, [signal.SIGHUP])
except HupDelivered:
pass
else:
raise TestFailed, "HUP not delivered"
if verbose:
print "testing sigsuspend"
signal.sigprocmask(signal.SIG_BLOCK, [signal.SIGHUP])
signal.signal(signal.SIGHUP, hup2)
if not os.fork():
time.sleep(2)
os.kill(pid, signal.SIGHUP)
time.sleep(2)
os.kill(pid, signal.SIGHUP)
os._exit(0)
else:
try:
signal.sigsuspend(defaultmask)
except:
raise TestFailed, "sigsuspend erroneously raised"
try:
signal.sigsuspend(defaultmask)
except HupDelivered:
pass
else:
raise TestFailed, "sigsupsend didn't raise"
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