--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/symbian-qemu-0.9.1-12/python-2.6.1/Lib/test/test_signal.py Fri Jul 31 15:01:17 2009 +0100
@@ -0,0 +1,392 @@
+import unittest
+from test import test_support
+from contextlib import closing, nested
+import gc
+import pickle
+import select
+import signal
+import subprocess
+import traceback
+import sys, os, time, errno
+
+if sys.platform[:3] in ('win', 'os2') or sys.platform == 'riscos':
+ raise test_support.TestSkipped("Can't test signal on %s" % \
+ sys.platform)
+
+
+class HandlerBCalled(Exception):
+ pass
+
+
+def exit_subprocess():
+ """Use os._exit(0) to exit the current subprocess.
+
+ Otherwise, the test catches the SystemExit and continues executing
+ in parallel with the original test, so you wind up with an
+ exponential number of tests running concurrently.
+ """
+ os._exit(0)
+
+
+def ignoring_eintr(__func, *args, **kwargs):
+ try:
+ return __func(*args, **kwargs)
+ except EnvironmentError as e:
+ if e.errno != errno.EINTR:
+ raise
+ return None
+
+
+class InterProcessSignalTests(unittest.TestCase):
+ MAX_DURATION = 20 # Entire test should last at most 20 sec.
+
+ def setUp(self):
+ self.using_gc = gc.isenabled()
+ gc.disable()
+
+ def tearDown(self):
+ if self.using_gc:
+ gc.enable()
+
+ def format_frame(self, frame, limit=None):
+ return ''.join(traceback.format_stack(frame, limit=limit))
+
+ def handlerA(self, signum, frame):
+ self.a_called = True
+ if test_support.verbose:
+ print "handlerA invoked from signal %s at:\n%s" % (
+ signum, self.format_frame(frame, limit=1))
+
+ def handlerB(self, signum, frame):
+ self.b_called = True
+ if test_support.verbose:
+ print "handlerB invoked from signal %s at:\n%s" % (
+ signum, self.format_frame(frame, limit=1))
+ raise HandlerBCalled(signum, self.format_frame(frame))
+
+ def wait(self, child):
+ """Wait for child to finish, ignoring EINTR."""
+ while True:
+ try:
+ child.wait()
+ return
+ except OSError as e:
+ if e.errno != errno.EINTR:
+ raise
+
+ def run_test(self):
+ # Install handlers. This function runs in a sub-process, so we
+ # don't worry about re-setting the default handlers.
+ signal.signal(signal.SIGHUP, self.handlerA)
+ signal.signal(signal.SIGUSR1, self.handlerB)
+ signal.signal(signal.SIGUSR2, signal.SIG_IGN)
+ signal.signal(signal.SIGALRM, signal.default_int_handler)
+
+ # Variables the signals will modify:
+ self.a_called = False
+ self.b_called = False
+
+ # Let the sub-processes know who to send signals to.
+ pid = os.getpid()
+ if test_support.verbose:
+ print "test runner's pid is", pid
+
+ child = ignoring_eintr(subprocess.Popen, ['kill', '-HUP', str(pid)])
+ if child:
+ self.wait(child)
+ if not self.a_called:
+ time.sleep(1) # Give the signal time to be delivered.
+ self.assertTrue(self.a_called)
+ self.assertFalse(self.b_called)
+ self.a_called = False
+
+ # Make sure the signal isn't delivered while the previous
+ # Popen object is being destroyed, because __del__ swallows
+ # exceptions.
+ del child
+ try:
+ child = subprocess.Popen(['kill', '-USR1', str(pid)])
+ # This wait should be interrupted by the signal's exception.
+ self.wait(child)
+ time.sleep(1) # Give the signal time to be delivered.
+ self.fail('HandlerBCalled exception not thrown')
+ except HandlerBCalled:
+ self.assertTrue(self.b_called)
+ self.assertFalse(self.a_called)
+ if test_support.verbose:
+ print "HandlerBCalled exception caught"
+
+ child = ignoring_eintr(subprocess.Popen, ['kill', '-USR2', str(pid)])
+ if child:
+ self.wait(child) # Nothing should happen.
+
+ try:
+ signal.alarm(1)
+ # The race condition in pause doesn't matter in this case,
+ # since alarm is going to raise a KeyboardException, which
+ # will skip the call.
+ signal.pause()
+ # But if another signal arrives before the alarm, pause
+ # may return early.
+ time.sleep(1)
+ except KeyboardInterrupt:
+ if test_support.verbose:
+ print "KeyboardInterrupt (the alarm() went off)"
+ except:
+ self.fail("Some other exception woke us from pause: %s" %
+ traceback.format_exc())
+ else:
+ self.fail("pause returned of its own accord, and the signal"
+ " didn't arrive after another second.")
+
+ def test_main(self):
+ # This function spawns a child process to insulate the main
+ # test-running process from all the signals. It then
+ # communicates with that child process over a pipe and
+ # re-raises information about any exceptions the child
+ # throws. The real work happens in self.run_test().
+ os_done_r, os_done_w = os.pipe()
+ with nested(closing(os.fdopen(os_done_r)),
+ closing(os.fdopen(os_done_w, 'w'))) as (done_r, done_w):
+ child = os.fork()
+ if child == 0:
+ # In the child process; run the test and report results
+ # through the pipe.
+ try:
+ done_r.close()
+ # Have to close done_w again here because
+ # exit_subprocess() will skip the enclosing with block.
+ with closing(done_w):
+ try:
+ self.run_test()
+ except:
+ pickle.dump(traceback.format_exc(), done_w)
+ else:
+ pickle.dump(None, done_w)
+ except:
+ print 'Uh oh, raised from pickle.'
+ traceback.print_exc()
+ finally:
+ exit_subprocess()
+
+ done_w.close()
+ # Block for up to MAX_DURATION seconds for the test to finish.
+ r, w, x = select.select([done_r], [], [], self.MAX_DURATION)
+ if done_r in r:
+ tb = pickle.load(done_r)
+ if tb:
+ self.fail(tb)
+ else:
+ os.kill(child, signal.SIGKILL)
+ self.fail('Test deadlocked after %d seconds.' %
+ self.MAX_DURATION)
+
+
+class BasicSignalTests(unittest.TestCase):
+ def trivial_signal_handler(self, *args):
+ pass
+
+ def test_out_of_range_signal_number_raises_error(self):
+ self.assertRaises(ValueError, signal.getsignal, 4242)
+
+ self.assertRaises(ValueError, signal.signal, 4242,
+ self.trivial_signal_handler)
+
+ def test_setting_signal_handler_to_none_raises_error(self):
+ self.assertRaises(TypeError, signal.signal,
+ signal.SIGUSR1, None)
+
+ def test_getsignal(self):
+ hup = signal.signal(signal.SIGHUP, self.trivial_signal_handler)
+ self.assertEquals(signal.getsignal(signal.SIGHUP),
+ self.trivial_signal_handler)
+ signal.signal(signal.SIGHUP, hup)
+ self.assertEquals(signal.getsignal(signal.SIGHUP), hup)
+
+
+class WakeupSignalTests(unittest.TestCase):
+ TIMEOUT_FULL = 10
+ TIMEOUT_HALF = 5
+
+ def test_wakeup_fd_early(self):
+ import select
+
+ signal.alarm(1)
+ before_time = time.time()
+ # We attempt to get a signal during the sleep,
+ # before select is called
+ time.sleep(self.TIMEOUT_FULL)
+ mid_time = time.time()
+ self.assert_(mid_time - before_time < self.TIMEOUT_HALF)
+ select.select([self.read], [], [], self.TIMEOUT_FULL)
+ after_time = time.time()
+ self.assert_(after_time - mid_time < self.TIMEOUT_HALF)
+
+ def test_wakeup_fd_during(self):
+ import select
+
+ signal.alarm(1)
+ before_time = time.time()
+ # We attempt to get a signal during the select call
+ self.assertRaises(select.error, select.select,
+ [self.read], [], [], self.TIMEOUT_FULL)
+ after_time = time.time()
+ self.assert_(after_time - before_time < self.TIMEOUT_HALF)
+
+ def setUp(self):
+ import fcntl
+
+ self.alrm = signal.signal(signal.SIGALRM, lambda x,y:None)
+ self.read, self.write = os.pipe()
+ flags = fcntl.fcntl(self.write, fcntl.F_GETFL, 0)
+ flags = flags | os.O_NONBLOCK
+ fcntl.fcntl(self.write, fcntl.F_SETFL, flags)
+ self.old_wakeup = signal.set_wakeup_fd(self.write)
+
+ def tearDown(self):
+ signal.set_wakeup_fd(self.old_wakeup)
+ os.close(self.read)
+ os.close(self.write)
+ signal.signal(signal.SIGALRM, self.alrm)
+
+class SiginterruptTest(unittest.TestCase):
+ signum = signal.SIGUSR1
+ def readpipe_interrupted(self, cb):
+ r, w = os.pipe()
+ ppid = os.getpid()
+ pid = os.fork()
+
+ oldhandler = signal.signal(self.signum, lambda x,y: None)
+ cb()
+ if pid==0:
+ # child code: sleep, kill, sleep. and then exit,
+ # which closes the pipe from which the parent process reads
+ try:
+ time.sleep(0.2)
+ os.kill(ppid, self.signum)
+ time.sleep(0.2)
+ finally:
+ exit_subprocess()
+
+ try:
+ os.close(w)
+
+ try:
+ d=os.read(r, 1)
+ return False
+ except OSError, err:
+ if err.errno != errno.EINTR:
+ raise
+ return True
+ finally:
+ signal.signal(self.signum, oldhandler)
+ os.waitpid(pid, 0)
+
+ def test_without_siginterrupt(self):
+ i=self.readpipe_interrupted(lambda: None)
+ self.assertEquals(i, True)
+
+ def test_siginterrupt_on(self):
+ i=self.readpipe_interrupted(lambda: signal.siginterrupt(self.signum, 1))
+ self.assertEquals(i, True)
+
+ def test_siginterrupt_off(self):
+ i=self.readpipe_interrupted(lambda: signal.siginterrupt(self.signum, 0))
+ self.assertEquals(i, False)
+
+class ItimerTest(unittest.TestCase):
+ def setUp(self):
+ self.hndl_called = False
+ self.hndl_count = 0
+ self.itimer = None
+ self.old_alarm = signal.signal(signal.SIGALRM, self.sig_alrm)
+
+ def tearDown(self):
+ signal.signal(signal.SIGALRM, self.old_alarm)
+ if self.itimer is not None: # test_itimer_exc doesn't change this attr
+ # just ensure that itimer is stopped
+ signal.setitimer(self.itimer, 0)
+
+ def sig_alrm(self, *args):
+ self.hndl_called = True
+ if test_support.verbose:
+ print("SIGALRM handler invoked", args)
+
+ def sig_vtalrm(self, *args):
+ self.hndl_called = True
+
+ if self.hndl_count > 3:
+ # it shouldn't be here, because it should have been disabled.
+ raise signal.ItimerError("setitimer didn't disable ITIMER_VIRTUAL "
+ "timer.")
+ elif self.hndl_count == 3:
+ # disable ITIMER_VIRTUAL, this function shouldn't be called anymore
+ signal.setitimer(signal.ITIMER_VIRTUAL, 0)
+ if test_support.verbose:
+ print("last SIGVTALRM handler call")
+
+ self.hndl_count += 1
+
+ if test_support.verbose:
+ print("SIGVTALRM handler invoked", args)
+
+ def sig_prof(self, *args):
+ self.hndl_called = True
+ signal.setitimer(signal.ITIMER_PROF, 0)
+
+ if test_support.verbose:
+ print("SIGPROF handler invoked", args)
+
+ def test_itimer_exc(self):
+ # XXX I'm assuming -1 is an invalid itimer, but maybe some platform
+ # defines it ?
+ self.assertRaises(signal.ItimerError, signal.setitimer, -1, 0)
+ # Negative times are treated as zero on some platforms.
+ if 0:
+ self.assertRaises(signal.ItimerError,
+ signal.setitimer, signal.ITIMER_REAL, -1)
+
+ def test_itimer_real(self):
+ self.itimer = signal.ITIMER_REAL
+ signal.setitimer(self.itimer, 1.0)
+ if test_support.verbose:
+ print("\ncall pause()...")
+ signal.pause()
+
+ self.assertEqual(self.hndl_called, True)
+
+ def test_itimer_virtual(self):
+ self.itimer = signal.ITIMER_VIRTUAL
+ signal.signal(signal.SIGVTALRM, self.sig_vtalrm)
+ signal.setitimer(self.itimer, 0.3, 0.2)
+
+ for i in xrange(100000000):
+ if signal.getitimer(self.itimer) == (0.0, 0.0):
+ break # sig_vtalrm handler stopped this itimer
+
+ # virtual itimer should be (0.0, 0.0) now
+ self.assertEquals(signal.getitimer(self.itimer), (0.0, 0.0))
+ # and the handler should have been called
+ self.assertEquals(self.hndl_called, True)
+
+ def test_itimer_prof(self):
+ self.itimer = signal.ITIMER_PROF
+ signal.signal(signal.SIGPROF, self.sig_prof)
+ signal.setitimer(self.itimer, 0.2, 0.2)
+
+ for i in xrange(100000000):
+ if signal.getitimer(self.itimer) == (0.0, 0.0):
+ break # sig_prof handler stopped this itimer
+
+ # profiling itimer should be (0.0, 0.0) now
+ self.assertEquals(signal.getitimer(self.itimer), (0.0, 0.0))
+ # and the handler should have been called
+ self.assertEqual(self.hndl_called, True)
+
+def test_main():
+ test_support.run_unittest(BasicSignalTests, InterProcessSignalTests,
+ WakeupSignalTests, SiginterruptTest, ItimerTest)
+
+
+if __name__ == "__main__":
+ test_main()