mirror of https://github.com/python/cpython
Patch #1008: port test_signal to unittest.
This commit is contained in:
Georg Brandl
parent
b3c572ba51
commit
9f2b93e03a
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test_signal
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starting pause() loop...
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@ -1,167 +1,177 @@
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# Test the signal module
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from test.test_support import verbose, TestSkipped, TestFailed, vereq
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import unittest
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from test import test_support
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import signal
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import os, sys, time
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if sys.platform[:3] in ('win', 'os2') or sys.platform=='riscos':
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raise TestSkipped, "Can't test signal on %s" % sys.platform
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MAX_DURATION = 20 # Entire test should last at most 20 sec.
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if verbose:
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x = '-x'
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else:
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x = '+x'
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pid = os.getpid()
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if verbose:
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print "test runner's pid is", pid
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# Shell script that will send us asynchronous signals
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script = """
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(
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set %(x)s
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sleep 2
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kill -HUP %(pid)d
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sleep 2
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kill -USR1 %(pid)d
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sleep 2
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kill -USR2 %(pid)d
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) &
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""" % vars()
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a_called = b_called = False
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def handlerA(*args):
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global a_called
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a_called = True
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if verbose:
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print "handlerA invoked", args
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class HandlerBCalled(Exception):
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pass
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def handlerB(*args):
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global b_called
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b_called = True
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if verbose:
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print "handlerB invoked", args
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raise HandlerBCalled, args
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class InterProcessSignalTests(unittest.TestCase):
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MAX_DURATION = 20 # Entire test should last at most 20 sec.
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# Set up a child to send signals to us (the parent) after waiting long
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# enough to receive the alarm. It seems we miss the alarm for some
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# reason. This will hopefully stop the hangs on Tru64/Alpha.
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# Alas, it doesn't. Tru64 appears to miss all the signals at times, or
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# seemingly random subsets of them, and nothing done in force_test_exit
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# so far has actually helped.
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def force_test_exit():
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# Sigh, both imports seem necessary to avoid errors.
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import os
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fork_pid = os.fork()
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if fork_pid:
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# In parent.
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return fork_pid
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# Set up a child to send signals to us (the parent) after waiting
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# long enough to receive the alarm. It seems we miss the alarm
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# for some reason. This will hopefully stop the hangs on
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# Tru64/Alpha. Alas, it doesn't. Tru64 appears to miss all the
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# signals at times, or seemingly random subsets of them, and
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# nothing done in force_test_exit so far has actually helped.
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def spawn_force_test_exit_process(self, parent_pid):
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# Sigh, both imports seem necessary to avoid errors.
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import os
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fork_pid = os.fork()
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if fork_pid:
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# In parent.
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return fork_pid
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# In child.
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import os, time
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try:
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# Wait 5 seconds longer than the expected alarm to give enough
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# time for the normal sequence of events to occur. This is
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# just a stop-gap to try to prevent the test from hanging.
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time.sleep(MAX_DURATION + 5)
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print >> sys.__stdout__, ' child should not have to kill parent'
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for signame in "SIGHUP", "SIGUSR1", "SIGUSR2", "SIGALRM":
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os.kill(pid, getattr(signal, signame))
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print >> sys.__stdout__, " child sent", signame, "to", pid
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time.sleep(1)
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finally:
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os._exit(0)
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# In child.
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import os, time
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try:
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# Wait 5 seconds longer than the expected alarm to give enough
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# time for the normal sequence of events to occur. This is
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# just a stop-gap to try to prevent the test from hanging.
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time.sleep(self.MAX_DURATION + 5)
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print >> sys.__stdout__, " child should not have to kill parent"
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for signame in "SIGHUP", "SIGUSR1", "SIGUSR2", "SIGALRM":
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os.kill(parent_pid, getattr(signal, signame))
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print >> sys.__stdout__, " child sent", signame, "to", \
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parent_pid
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time.sleep(1)
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finally:
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os._exit(0)
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# Install handlers.
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hup = signal.signal(signal.SIGHUP, handlerA)
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usr1 = signal.signal(signal.SIGUSR1, handlerB)
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usr2 = signal.signal(signal.SIGUSR2, signal.SIG_IGN)
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alrm = signal.signal(signal.SIGALRM, signal.default_int_handler)
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def handlerA(self, *args):
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self.a_called = True
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if test_support.verbose:
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print "handlerA invoked", args
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try:
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def handlerB(self, *args):
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self.b_called = True
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if test_support.verbose:
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print "handlerB invoked", args
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raise HandlerBCalled(*args)
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signal.alarm(MAX_DURATION)
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vereq(signal.getsignal(signal.SIGHUP), handlerA)
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vereq(signal.getsignal(signal.SIGUSR1), handlerB)
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vereq(signal.getsignal(signal.SIGUSR2), signal.SIG_IGN)
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vereq(signal.getsignal(signal.SIGALRM), signal.default_int_handler)
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def test_main(self):
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self.assertEquals(signal.getsignal(signal.SIGHUP), self.handlerA)
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self.assertEquals(signal.getsignal(signal.SIGUSR1), self.handlerB)
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self.assertEquals(signal.getsignal(signal.SIGUSR2), signal.SIG_IGN)
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self.assertEquals(signal.getsignal(signal.SIGALRM),
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signal.default_int_handler)
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# Try to ensure this test exits even if there is some problem with alarm.
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# Tru64/Alpha often hangs and is ultimately killed by the buildbot.
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fork_pid = force_test_exit()
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# Launch an external script to send us signals.
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# We expect the external script to:
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# send HUP, which invokes handlerA to set a_called
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# send USR1, which invokes handlerB to set b_called and raise
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# HandlerBCalled
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# send USR2, which is ignored
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#
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# Then we expect the alarm to go off, and its handler raises
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# KeyboardInterrupt, finally getting us out of the loop.
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try:
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signal.getsignal(4242)
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raise TestFailed('expected ValueError for invalid signal # to '
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'getsignal()')
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except ValueError:
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pass
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if test_support.verbose:
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verboseflag = '-x'
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else:
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verboseflag = '+x'
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try:
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signal.signal(4242, handlerB)
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raise TestFailed('expected ValueError for invalid signal # to '
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'signal()')
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except ValueError:
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pass
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pid = self.pid
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if test_support.verbose:
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print "test runner's pid is", pid
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try:
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signal.signal(signal.SIGUSR1, None)
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raise TestFailed('expected TypeError for non-callable')
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except TypeError:
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pass
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# Shell script that will send us asynchronous signals
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script = """
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(
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set %(verboseflag)s
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sleep 2
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kill -HUP %(pid)d
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sleep 2
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kill -USR1 %(pid)d
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sleep 2
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kill -USR2 %(pid)d
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) &
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""" % vars()
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# Launch an external script to send us signals.
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# We expect the external script to:
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# send HUP, which invokes handlerA to set a_called
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# send USR1, which invokes handlerB to set b_called and raise
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# HandlerBCalled
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# send USR2, which is ignored
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#
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# Then we expect the alarm to go off, and its handler raises
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# KeyboardInterrupt, finally getting us out of the loop.
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os.system(script)
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try:
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print "starting pause() loop..."
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while 1:
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try:
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if verbose:
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print "call pause()..."
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signal.pause()
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if verbose:
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print "pause() returned"
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except HandlerBCalled:
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if verbose:
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print "HandlerBCalled exception caught"
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signal.alarm(self.MAX_DURATION)
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except KeyboardInterrupt:
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if verbose:
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print "KeyboardInterrupt (the alarm() went off)"
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handler_b_exception_raised = False
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if not a_called:
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print 'HandlerA not called'
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os.system(script)
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try:
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if test_support.verbose:
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print "starting pause() loop..."
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while 1:
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try:
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if test_support.verbose:
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print "call pause()..."
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signal.pause()
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if test_support.verbose:
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print "pause() returned"
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except HandlerBCalled:
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handler_b_exception_raised = True
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if test_support.verbose:
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print "HandlerBCalled exception caught"
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if not b_called:
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print 'HandlerB not called'
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except KeyboardInterrupt:
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if test_support.verbose:
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print "KeyboardInterrupt (the alarm() went off)"
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finally:
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# Forcibly kill the child we created to ping us if there was a test error.
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try:
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# Make sure we don't kill ourself if there was a fork error.
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if fork_pid > 0:
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os.kill(fork_pid, signal.SIGKILL)
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except:
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# If the child killed us, it has probably exited. Killing a
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# non-existent process will raise an error which we don't care about.
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pass
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self.assert_(self.a_called)
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self.assert_(self.b_called)
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self.assert_(handler_b_exception_raised)
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# Restore handlers.
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signal.alarm(0) # cancel alarm in case we died early
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signal.signal(signal.SIGHUP, hup)
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signal.signal(signal.SIGUSR1, usr1)
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signal.signal(signal.SIGUSR2, usr2)
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signal.signal(signal.SIGALRM, alrm)
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def setUp(self):
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# Install handlers.
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self.hup = signal.signal(signal.SIGHUP, self.handlerA)
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self.usr1 = signal.signal(signal.SIGUSR1, self.handlerB)
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self.usr2 = signal.signal(signal.SIGUSR2, signal.SIG_IGN)
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self.alrm = signal.signal(signal.SIGALRM,
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signal.default_int_handler)
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self.a_called = False
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self.b_called = False
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self.pid = os.getpid()
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self.fork_pid = self.spawn_force_test_exit_process(self.pid)
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def tearDown(self):
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# Forcibly kill the child we created to ping us if there was a
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# test error.
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try:
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# Make sure we don't kill ourself if there was a fork
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# error.
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if self.fork_pid > 0:
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os.kill(self.fork_pid, signal.SIGKILL)
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except:
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# If the child killed us, it has probably exited. Killing
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# a non-existent process will raise an error which we
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# don't care about.
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pass
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# Restore handlers.
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signal.alarm(0) # cancel alarm in case we died early
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signal.signal(signal.SIGHUP, self.hup)
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signal.signal(signal.SIGUSR1, self.usr1)
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signal.signal(signal.SIGUSR2, self.usr2)
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signal.signal(signal.SIGALRM, self.alrm)
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class BasicSignalTests(unittest.TestCase):
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def test_out_of_range_signal_number_raises_error(self):
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self.assertRaises(ValueError, signal.getsignal, 4242)
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def trivial_signal_handler(*args):
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pass
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self.assertRaises(ValueError, signal.signal, 4242,
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trivial_signal_handler)
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def test_setting_signal_handler_to_none_raises_error(self):
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self.assertRaises(TypeError, signal.signal,
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signal.SIGUSR1, None)
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def test_main():
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if sys.platform[:3] in ('win', 'os2') or sys.platform == 'riscos':
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raise test_support.TestSkipped("Can't test signal on %s" % \
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sys.platform)
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test_support.run_unittest(BasicSignalTests, InterProcessSignalTests)
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if __name__ == "__main__":
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test_main()
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