226 lines
7.7 KiB
Python
226 lines
7.7 KiB
Python
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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class HandlerBCalled(Exception):
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pass
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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
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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(self.MAX_DURATION + 5)
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print(" child should not have to kill parent",
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file=sys.__stdout__)
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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(" child sent", signame, "to",
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parent_pid, file=sys.__stdout__)
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time.sleep(1)
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finally:
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os._exit(0)
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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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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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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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# 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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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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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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# 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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signal.alarm(self.MAX_DURATION)
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handler_b_exception_raised = False
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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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except KeyboardInterrupt:
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if test_support.verbose:
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print("KeyboardInterrupt (the alarm() went off)")
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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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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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class WakeupSignalTests(unittest.TestCase):
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TIMEOUT_FULL = 10
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TIMEOUT_HALF = 5
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def test_wakeup_fd_early(self):
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import select
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signal.alarm(1)
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before_time = time.time()
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# We attempt to get a signal during the sleep,
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# before select is called
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time.sleep(self.TIMEOUT_FULL)
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mid_time = time.time()
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self.assert_(mid_time - before_time < self.TIMEOUT_HALF)
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select.select([self.read], [], [], self.TIMEOUT_FULL)
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after_time = time.time()
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self.assert_(after_time - mid_time < self.TIMEOUT_HALF)
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def test_wakeup_fd_during(self):
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import select
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signal.alarm(1)
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before_time = time.time()
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# We attempt to get a signal during the select call
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self.assertRaises(select.error, select.select,
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[self.read], [], [], self.TIMEOUT_FULL)
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after_time = time.time()
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self.assert_(after_time - before_time < self.TIMEOUT_HALF)
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def setUp(self):
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import fcntl
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self.alrm = signal.signal(signal.SIGALRM, lambda x,y:None)
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self.read, self.write = os.pipe()
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flags = fcntl.fcntl(self.write, fcntl.F_GETFL, 0)
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flags = flags | os.O_NONBLOCK
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fcntl.fcntl(self.write, fcntl.F_SETFL, flags)
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self.old_wakeup = signal.set_wakeup_fd(self.write)
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def tearDown(self):
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signal.set_wakeup_fd(self.old_wakeup)
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os.close(self.read)
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os.close(self.write)
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signal.signal(signal.SIGALRM, self.alrm)
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def test_main():
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if sys.platform[:3] in ('win', 'os2'):
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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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WakeupSignalTests)
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if __name__ == "__main__":
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test_main()
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