bpo-42639: atexit._run_exitfuncs() uses sys.unraisablehook (GH-23779)
atexit._run_exitfuncs() now logs callback exceptions using sys.unraisablehook, rather than logging them directly into sys.stderr and raising the last exception. Run GeneralTest of test_atexit in a subprocess since it calls atexit._clear() which clears all atexit callbacks. _PyAtExit_Fini() sets state->callbacks to NULL.
This commit is contained in:
Victor Stinner
GitHub
parent
ceb420251c
commit
3ca2b8fd75
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@ -0,0 +1,121 @@
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"""
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Tests run by test_atexit in a subprocess since it clears atexit callbacks.
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"""
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import atexit
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import sys
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import unittest
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from test import support
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class GeneralTest(unittest.TestCase):
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def setUp(self):
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atexit._clear()
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def tearDown(self):
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atexit._clear()
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def assert_raises_unraisable(self, exc_type, func, *args):
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with support.catch_unraisable_exception() as cm:
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atexit.register(func, *args)
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atexit._run_exitfuncs()
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self.assertEqual(cm.unraisable.object, func)
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self.assertEqual(cm.unraisable.exc_type, exc_type)
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self.assertEqual(type(cm.unraisable.exc_value), exc_type)
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def test_order(self):
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# Check that callbacks are called in reverse order with the expected
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# positional and keyword arguments.
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calls = []
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def func1(*args, **kwargs):
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calls.append(('func1', args, kwargs))
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def func2(*args, **kwargs):
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calls.append(('func2', args, kwargs))
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# be sure args are handled properly
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atexit.register(func1, 1, 2)
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atexit.register(func2)
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atexit.register(func2, 3, key="value")
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atexit._run_exitfuncs()
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self.assertEqual(calls,
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[('func2', (3,), {'key': 'value'}),
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('func2', (), {}),
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('func1', (1, 2), {})])
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def test_badargs(self):
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def func():
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pass
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# func() has no parameter, but it's called with 2 parameters
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self.assert_raises_unraisable(TypeError, func, 1 ,2)
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def test_raise(self):
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def raise_type_error():
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raise TypeError
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self.assert_raises_unraisable(TypeError, raise_type_error)
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def test_raise_unnormalized(self):
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# bpo-10756: Make sure that an unnormalized exception is handled
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# properly.
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def div_zero():
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1 / 0
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self.assert_raises_unraisable(ZeroDivisionError, div_zero)
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def test_exit(self):
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self.assert_raises_unraisable(SystemExit, sys.exit)
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def test_stress(self):
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a = [0]
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def inc():
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a[0] += 1
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for i in range(128):
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atexit.register(inc)
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atexit._run_exitfuncs()
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self.assertEqual(a[0], 128)
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def test_clear(self):
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a = [0]
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def inc():
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a[0] += 1
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atexit.register(inc)
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atexit._clear()
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atexit._run_exitfuncs()
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self.assertEqual(a[0], 0)
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def test_unregister(self):
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a = [0]
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def inc():
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a[0] += 1
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def dec():
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a[0] -= 1
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for i in range(4):
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atexit.register(inc)
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atexit.register(dec)
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atexit.unregister(inc)
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atexit._run_exitfuncs()
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self.assertEqual(a[0], -1)
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def test_bound_methods(self):
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l = []
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atexit.register(l.append, 5)
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atexit._run_exitfuncs()
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self.assertEqual(l, [5])
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atexit.unregister(l.append)
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atexit._run_exitfuncs()
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self.assertEqual(l, [5])
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if __name__ == "__main__":
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unittest.main()
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@ -1,5 +1,4 @@
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import atexit
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import io
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import os
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import sys
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import textwrap
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@ -7,154 +6,14 @@ import unittest
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from test import support
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from test.support import script_helper
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### helpers
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def h1():
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print("h1")
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def h2():
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print("h2")
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def h3():
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print("h3")
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def h4(*args, **kwargs):
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print("h4", args, kwargs)
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def raise1():
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raise TypeError
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def raise2():
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raise SystemError
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def exit():
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raise SystemExit
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class GeneralTest(unittest.TestCase):
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def test_general(self):
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# Run _test_atexit.py in a subprocess since it calls atexit._clear()
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script = support.findfile("_test_atexit.py")
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script_helper.run_test_script(script)
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def setUp(self):
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self.save_stdout = sys.stdout
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self.save_stderr = sys.stderr
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self.stream = io.StringIO()
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sys.stdout = sys.stderr = self.stream
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atexit._clear()
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def tearDown(self):
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sys.stdout = self.save_stdout
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sys.stderr = self.save_stderr
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atexit._clear()
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def test_args(self):
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# be sure args are handled properly
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atexit.register(h1)
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atexit.register(h4)
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atexit.register(h4, 4, kw="abc")
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atexit._run_exitfuncs()
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self.assertEqual(self.stream.getvalue(),
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"h4 (4,) {'kw': 'abc'}\nh4 () {}\nh1\n")
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def test_badargs(self):
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atexit.register(lambda: 1, 0, 0, (x for x in (1,2)), 0, 0)
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self.assertRaises(TypeError, atexit._run_exitfuncs)
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def test_order(self):
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# be sure handlers are executed in reverse order
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atexit.register(h1)
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atexit.register(h2)
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atexit.register(h3)
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atexit._run_exitfuncs()
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self.assertEqual(self.stream.getvalue(), "h3\nh2\nh1\n")
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def test_raise(self):
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# be sure raises are handled properly
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atexit.register(raise1)
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atexit.register(raise2)
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self.assertRaises(TypeError, atexit._run_exitfuncs)
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def test_raise_unnormalized(self):
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# Issue #10756: Make sure that an unnormalized exception is
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# handled properly
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atexit.register(lambda: 1 / 0)
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self.assertRaises(ZeroDivisionError, atexit._run_exitfuncs)
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self.assertIn("ZeroDivisionError", self.stream.getvalue())
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def test_exit(self):
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# be sure a SystemExit is handled properly
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atexit.register(exit)
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self.assertRaises(SystemExit, atexit._run_exitfuncs)
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self.assertEqual(self.stream.getvalue(), '')
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def test_print_tracebacks(self):
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# Issue #18776: the tracebacks should be printed when errors occur.
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def f():
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1/0 # one
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def g():
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1/0 # two
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def h():
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1/0 # three
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atexit.register(f)
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atexit.register(g)
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atexit.register(h)
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self.assertRaises(ZeroDivisionError, atexit._run_exitfuncs)
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stderr = self.stream.getvalue()
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self.assertEqual(stderr.count("ZeroDivisionError"), 3)
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self.assertIn("# one", stderr)
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self.assertIn("# two", stderr)
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self.assertIn("# three", stderr)
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def test_stress(self):
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a = [0]
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def inc():
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a[0] += 1
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for i in range(128):
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atexit.register(inc)
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atexit._run_exitfuncs()
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self.assertEqual(a[0], 128)
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def test_clear(self):
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a = [0]
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def inc():
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a[0] += 1
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atexit.register(inc)
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atexit._clear()
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atexit._run_exitfuncs()
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self.assertEqual(a[0], 0)
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def test_unregister(self):
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a = [0]
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def inc():
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a[0] += 1
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def dec():
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a[0] -= 1
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for i in range(4):
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atexit.register(inc)
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atexit.register(dec)
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atexit.unregister(inc)
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atexit._run_exitfuncs()
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self.assertEqual(a[0], -1)
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def test_bound_methods(self):
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l = []
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atexit.register(l.append, 5)
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atexit._run_exitfuncs()
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self.assertEqual(l, [5])
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atexit.unregister(l.append)
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atexit._run_exitfuncs()
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self.assertEqual(l, [5])
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class FunctionalTest(unittest.TestCase):
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def test_shutdown(self):
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# Actually test the shutdown mechanism in a subprocess
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code = textwrap.dedent("""
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@ -1,9 +1,6 @@
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import os
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import signal
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import subprocess
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import sys
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import unittest
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from test import support
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from test.support import script_helper
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@ -0,0 +1,3 @@
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:func:`atexit._run_exitfuncs` now logs callback exceptions using
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:data:`sys.unraisablehook`, rather than logging them directly into
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:data:`sys.stderr` and raise the last exception.
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@ -74,11 +74,12 @@ _PyAtExit_Fini(PyInterpreterState *interp)
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struct atexit_state *state = &interp->atexit;
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atexit_cleanup(state);
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PyMem_Free(state->callbacks);
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state->callbacks = NULL;
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}
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static void
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atexit_callfuncs(struct atexit_state *state, int ignore_exc)
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atexit_callfuncs(struct atexit_state *state)
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{
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assert(!PyErr_Occurred());
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@ -86,7 +87,6 @@ atexit_callfuncs(struct atexit_state *state, int ignore_exc)
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return;
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}
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PyObject *exc_type = NULL, *exc_value, *exc_tb;
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for (int i = state->ncallbacks - 1; i >= 0; i--) {
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atexit_callback *cb = state->callbacks[i];
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if (cb == NULL) {
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@ -95,25 +95,8 @@ atexit_callfuncs(struct atexit_state *state, int ignore_exc)
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PyObject *res = PyObject_Call(cb->func, cb->args, cb->kwargs);
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if (res == NULL) {
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if (ignore_exc) {
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_PyErr_WriteUnraisableMsg("in atexit callback", cb->func);
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}
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else {
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/* Maintain the last exception, but don't leak if there are
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multiple exceptions. */
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if (exc_type) {
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Py_DECREF(exc_type);
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Py_XDECREF(exc_value);
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Py_XDECREF(exc_tb);
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}
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PyErr_Fetch(&exc_type, &exc_value, &exc_tb);
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if (!PyErr_GivenExceptionMatches(exc_type, PyExc_SystemExit)) {
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PySys_WriteStderr("Error in atexit._run_exitfuncs:\n");
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PyErr_NormalizeException(&exc_type, &exc_value, &exc_tb);
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PyErr_Display(exc_type, exc_value, exc_tb);
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}
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}
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}
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else {
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Py_DECREF(res);
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}
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@ -121,22 +104,15 @@ atexit_callfuncs(struct atexit_state *state, int ignore_exc)
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atexit_cleanup(state);
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if (ignore_exc) {
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assert(!PyErr_Occurred());
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}
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else {
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if (exc_type) {
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PyErr_Restore(exc_type, exc_value, exc_tb);
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}
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}
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}
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void
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_PyAtExit_Call(PyThreadState *tstate)
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{
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struct atexit_state *state = &tstate->interp->atexit;
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atexit_callfuncs(state, 1);
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atexit_callfuncs(state);
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}
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@ -177,8 +153,9 @@ atexit_register(PyObject *module, PyObject *args, PyObject *kwargs)
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state->callback_len += 16;
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size_t size = sizeof(atexit_callback*) * (size_t)state->callback_len;
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r = (atexit_callback**)PyMem_Realloc(state->callbacks, size);
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if (r == NULL)
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if (r == NULL) {
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return PyErr_NoMemory();
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}
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state->callbacks = r;
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}
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@ -203,16 +180,15 @@ atexit_register(PyObject *module, PyObject *args, PyObject *kwargs)
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PyDoc_STRVAR(atexit_run_exitfuncs__doc__,
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"_run_exitfuncs() -> None\n\
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\n\
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Run all registered exit functions.");
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Run all registered exit functions.\n\
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\n\
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If a callaback raises an exception, it is logged with sys.unraisablehook.");
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static PyObject *
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atexit_run_exitfuncs(PyObject *module, PyObject *unused)
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{
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struct atexit_state *state = get_atexit_state();
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atexit_callfuncs(state, 0);
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if (PyErr_Occurred()) {
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return NULL;
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}
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atexit_callfuncs(state);
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Py_RETURN_NONE;
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}
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