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Patch #1008: port test_signal to unittest.

This commit is contained in:
Georg Brandl 2007-08-24 18:07:52 +00:00
parent b3c572ba51
commit 9f2b93e03a
2 changed files with 156 additions and 148 deletions
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2
Lib/test/output/test_signal
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test_signal
starting pause() loop...

302
Lib/test/test_signal.py
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# Test the signal module import unittest
from test.test_support import verbose, TestSkipped, TestFailed, vereq from test import test_support
import signal import signal
import os, sys, time 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
MAX_DURATION = 20 # Entire test should last at most 20 sec.
if verbose:
x = '-x'
else:
x = '+x'
pid = os.getpid()
if verbose:
print "test runner's pid is", pid
# 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()
a_called = b_called = False
def handlerA(*args):
global a_called
a_called = True
if verbose:
print "handlerA invoked", args
class HandlerBCalled(Exception): class HandlerBCalled(Exception):
pass pass
def handlerB(*args): class InterProcessSignalTests(unittest.TestCase):
global b_called MAX_DURATION = 20 # Entire test should last at most 20 sec.
b_called = True
if verbose:
print "handlerB invoked", args
raise HandlerBCalled, args
# Set up a child to send signals to us (the parent) after waiting long # Set up a child to send signals to us (the parent) after waiting
# enough to receive the alarm. It seems we miss the alarm for some # long enough to receive the alarm. It seems we miss the alarm
# reason. This will hopefully stop the hangs on Tru64/Alpha. # for some reason. This will hopefully stop the hangs on
# Alas, it doesn't. Tru64 appears to miss all the signals at times, or # Tru64/Alpha. Alas, it doesn't. Tru64 appears to miss all the
# seemingly random subsets of them, and nothing done in force_test_exit # signals at times, or seemingly random subsets of them, and
# so far has actually helped. # nothing done in force_test_exit so far has actually helped.
def force_test_exit(): def spawn_force_test_exit_process(self, parent_pid):
# Sigh, both imports seem necessary to avoid errors. # Sigh, both imports seem necessary to avoid errors.
import os import os
fork_pid = os.fork() fork_pid = os.fork()
if fork_pid: if fork_pid:
# In parent. # In parent.
return fork_pid return fork_pid
# In child. # In child.
import os, time import os, time
try: try:
# Wait 5 seconds longer than the expected alarm to give enough # Wait 5 seconds longer than the expected alarm to give enough
# time for the normal sequence of events to occur. This is # time for the normal sequence of events to occur. This is
# just a stop-gap to try to prevent the test from hanging. # just a stop-gap to try to prevent the test from hanging.
time.sleep(MAX_DURATION + 5) time.sleep(self.MAX_DURATION + 5)
print >> sys.__stdout__, ' child should not have to kill parent' print >> sys.__stdout__, " child should not have to kill parent"
for signame in "SIGHUP", "SIGUSR1", "SIGUSR2", "SIGALRM": for signame in "SIGHUP", "SIGUSR1", "SIGUSR2", "SIGALRM":
os.kill(pid, getattr(signal, signame)) os.kill(parent_pid, getattr(signal, signame))
print >> sys.__stdout__, " child sent", signame, "to", pid print >> sys.__stdout__, " child sent", signame, "to", \
time.sleep(1) parent_pid
finally: time.sleep(1)
os._exit(0) finally:
os._exit(0)
# Install handlers. def handlerA(self, *args):
hup = signal.signal(signal.SIGHUP, handlerA) self.a_called = True
usr1 = signal.signal(signal.SIGUSR1, handlerB) if test_support.verbose:
usr2 = signal.signal(signal.SIGUSR2, signal.SIG_IGN) print "handlerA invoked", args
alrm = signal.signal(signal.SIGALRM, signal.default_int_handler)
try: def handlerB(self, *args):
self.b_called = True
if test_support.verbose:
print "handlerB invoked", args
raise HandlerBCalled(*args)
signal.alarm(MAX_DURATION) def test_main(self):
vereq(signal.getsignal(signal.SIGHUP), handlerA) self.assertEquals(signal.getsignal(signal.SIGHUP), self.handlerA)
vereq(signal.getsignal(signal.SIGUSR1), handlerB) self.assertEquals(signal.getsignal(signal.SIGUSR1), self.handlerB)
vereq(signal.getsignal(signal.SIGUSR2), signal.SIG_IGN) self.assertEquals(signal.getsignal(signal.SIGUSR2), signal.SIG_IGN)
vereq(signal.getsignal(signal.SIGALRM), signal.default_int_handler) self.assertEquals(signal.getsignal(signal.SIGALRM),
signal.default_int_handler)
# Try to ensure this test exits even if there is some problem with alarm. # Launch an external script to send us signals.
# Tru64/Alpha often hangs and is ultimately killed by the buildbot. # We expect the external script to:
fork_pid = force_test_exit() # send HUP, which invokes handlerA to set a_called
# send USR1, which invokes handlerB to set b_called and raise
# HandlerBCalled
# send USR2, which is ignored
#
# Then we expect the alarm to go off, and its handler raises
# KeyboardInterrupt, finally getting us out of the loop.
try: if test_support.verbose:
signal.getsignal(4242) verboseflag = '-x'
raise TestFailed('expected ValueError for invalid signal # to ' else:
'getsignal()') verboseflag = '+x'
except ValueError:
pass
try: pid = self.pid
signal.signal(4242, handlerB) if test_support.verbose:
raise TestFailed('expected ValueError for invalid signal # to ' print "test runner's pid is", pid
'signal()')
except ValueError:
pass
try: # Shell script that will send us asynchronous signals
signal.signal(signal.SIGUSR1, None) script = """
raise TestFailed('expected TypeError for non-callable') (
except TypeError: set %(verboseflag)s
pass sleep 2
kill -HUP %(pid)d
sleep 2
kill -USR1 %(pid)d
sleep 2
kill -USR2 %(pid)d
) &
""" % vars()
# Launch an external script to send us signals. signal.alarm(self.MAX_DURATION)
# We expect the external script to:
# send HUP, which invokes handlerA to set a_called
# send USR1, which invokes handlerB to set b_called and raise
# HandlerBCalled
# send USR2, which is ignored
#
# Then we expect the alarm to go off, and its handler raises
# KeyboardInterrupt, finally getting us out of the loop.
os.system(script)
try:
print "starting pause() loop..."
while 1:
try:
if verbose:
print "call pause()..."
signal.pause()
if verbose:
print "pause() returned"
except HandlerBCalled:
if verbose:
print "HandlerBCalled exception caught"
except KeyboardInterrupt: handler_b_exception_raised = False
if verbose:
print "KeyboardInterrupt (the alarm() went off)"
if not a_called: os.system(script)
print 'HandlerA not called' try:
if test_support.verbose:
print "starting pause() loop..."
while 1:
try:
if test_support.verbose:
print "call pause()..."
signal.pause()
if test_support.verbose:
print "pause() returned"
except HandlerBCalled:
handler_b_exception_raised = True
if test_support.verbose:
print "HandlerBCalled exception caught"
if not b_called: except KeyboardInterrupt:
print 'HandlerB not called' if test_support.verbose:
print "KeyboardInterrupt (the alarm() went off)"
finally: self.assert_(self.a_called)
# Forcibly kill the child we created to ping us if there was a test error. self.assert_(self.b_called)
try: self.assert_(handler_b_exception_raised)
# Make sure we don't kill ourself if there was a fork error.
if fork_pid > 0:
os.kill(fork_pid, signal.SIGKILL)
except:
# If the child killed us, it has probably exited. Killing a
# non-existent process will raise an error which we don't care about.
pass
# Restore handlers. def setUp(self):
signal.alarm(0) # cancel alarm in case we died early # Install handlers.
signal.signal(signal.SIGHUP, hup) self.hup = signal.signal(signal.SIGHUP, self.handlerA)
signal.signal(signal.SIGUSR1, usr1) self.usr1 = signal.signal(signal.SIGUSR1, self.handlerB)
signal.signal(signal.SIGUSR2, usr2) self.usr2 = signal.signal(signal.SIGUSR2, signal.SIG_IGN)
signal.signal(signal.SIGALRM, alrm) self.alrm = signal.signal(signal.SIGALRM,
signal.default_int_handler)
self.a_called = False
self.b_called = False
self.pid = os.getpid()
self.fork_pid = self.spawn_force_test_exit_process(self.pid)
def tearDown(self):
# Forcibly kill the child we created to ping us if there was a
# test error.
try:
# Make sure we don't kill ourself if there was a fork
# error.
if self.fork_pid > 0:
os.kill(self.fork_pid, signal.SIGKILL)
except:
# If the child killed us, it has probably exited. Killing
# a non-existent process will raise an error which we
# don't care about.
pass
# Restore handlers.
signal.alarm(0) # cancel alarm in case we died early
signal.signal(signal.SIGHUP, self.hup)
signal.signal(signal.SIGUSR1, self.usr1)
signal.signal(signal.SIGUSR2, self.usr2)
signal.signal(signal.SIGALRM, self.alrm)
class BasicSignalTests(unittest.TestCase):
def test_out_of_range_signal_number_raises_error(self):
self.assertRaises(ValueError, signal.getsignal, 4242)
def trivial_signal_handler(*args):
pass
self.assertRaises(ValueError, signal.signal, 4242,
trivial_signal_handler)
def test_setting_signal_handler_to_none_raises_error(self):
self.assertRaises(TypeError, signal.signal,
signal.SIGUSR1, None)
def test_main():
if sys.platform[:3] in ('win', 'os2') or sys.platform == 'riscos':
raise test_support.TestSkipped("Can't test signal on %s" % \
sys.platform)
test_support.run_unittest(BasicSignalTests, InterProcessSignalTests)
if __name__ == "__main__":
test_main()