mirror of https://github.com/python/cpython
1484 lines
53 KiB
Python
1484 lines
53 KiB
Python
import enum
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import errno
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import functools
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import inspect
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import os
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import random
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import signal
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import socket
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import statistics
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import subprocess
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import sys
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import threading
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import time
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import unittest
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from test import support
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from test.support import (
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is_apple, is_apple_mobile, os_helper, threading_helper
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)
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from test.support.script_helper import assert_python_ok, spawn_python
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try:
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import _testcapi
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except ImportError:
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_testcapi = None
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class GenericTests(unittest.TestCase):
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def test_enums(self):
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for name in dir(signal):
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sig = getattr(signal, name)
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if name in {'SIG_DFL', 'SIG_IGN'}:
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self.assertIsInstance(sig, signal.Handlers)
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elif name in {'SIG_BLOCK', 'SIG_UNBLOCK', 'SIG_SETMASK'}:
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self.assertIsInstance(sig, signal.Sigmasks)
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elif name.startswith('SIG') and not name.startswith('SIG_'):
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self.assertIsInstance(sig, signal.Signals)
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elif name.startswith('CTRL_'):
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self.assertIsInstance(sig, signal.Signals)
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self.assertEqual(sys.platform, "win32")
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CheckedSignals = enum._old_convert_(
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enum.IntEnum, 'Signals', 'signal',
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lambda name:
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name.isupper()
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and (name.startswith('SIG') and not name.startswith('SIG_'))
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or name.startswith('CTRL_'),
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source=signal,
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)
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enum._test_simple_enum(CheckedSignals, signal.Signals)
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CheckedHandlers = enum._old_convert_(
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enum.IntEnum, 'Handlers', 'signal',
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lambda name: name in ('SIG_DFL', 'SIG_IGN'),
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source=signal,
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)
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enum._test_simple_enum(CheckedHandlers, signal.Handlers)
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Sigmasks = getattr(signal, 'Sigmasks', None)
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if Sigmasks is not None:
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CheckedSigmasks = enum._old_convert_(
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enum.IntEnum, 'Sigmasks', 'signal',
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lambda name: name in ('SIG_BLOCK', 'SIG_UNBLOCK', 'SIG_SETMASK'),
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source=signal,
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)
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enum._test_simple_enum(CheckedSigmasks, Sigmasks)
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def test_functions_module_attr(self):
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# Issue #27718: If __all__ is not defined all non-builtin functions
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# should have correct __module__ to be displayed by pydoc.
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for name in dir(signal):
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value = getattr(signal, name)
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if inspect.isroutine(value) and not inspect.isbuiltin(value):
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self.assertEqual(value.__module__, 'signal')
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@unittest.skipIf(sys.platform == "win32", "Not valid on Windows")
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class PosixTests(unittest.TestCase):
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def trivial_signal_handler(self, *args):
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pass
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def create_handler_with_partial(self, argument):
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return functools.partial(self.trivial_signal_handler, argument)
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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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self.assertRaises(ValueError, signal.signal, 4242,
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self.trivial_signal_handler)
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self.assertRaises(ValueError, signal.strsignal, 4242)
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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_getsignal(self):
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hup = signal.signal(signal.SIGHUP, self.trivial_signal_handler)
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self.assertIsInstance(hup, signal.Handlers)
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self.assertEqual(signal.getsignal(signal.SIGHUP),
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self.trivial_signal_handler)
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signal.signal(signal.SIGHUP, hup)
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self.assertEqual(signal.getsignal(signal.SIGHUP), hup)
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def test_no_repr_is_called_on_signal_handler(self):
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# See https://github.com/python/cpython/issues/112559.
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class MyArgument:
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def __init__(self):
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self.repr_count = 0
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def __repr__(self):
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self.repr_count += 1
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return super().__repr__()
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argument = MyArgument()
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self.assertEqual(0, argument.repr_count)
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handler = self.create_handler_with_partial(argument)
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hup = signal.signal(signal.SIGHUP, handler)
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self.assertIsInstance(hup, signal.Handlers)
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self.assertEqual(signal.getsignal(signal.SIGHUP), handler)
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signal.signal(signal.SIGHUP, hup)
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self.assertEqual(signal.getsignal(signal.SIGHUP), hup)
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self.assertEqual(0, argument.repr_count)
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def test_strsignal(self):
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self.assertIn("Interrupt", signal.strsignal(signal.SIGINT))
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self.assertIn("Terminated", signal.strsignal(signal.SIGTERM))
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self.assertIn("Hangup", signal.strsignal(signal.SIGHUP))
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# Issue 3864, unknown if this affects earlier versions of freebsd also
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def test_interprocess_signal(self):
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dirname = os.path.dirname(__file__)
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script = os.path.join(dirname, 'signalinterproctester.py')
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assert_python_ok(script)
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@unittest.skipUnless(
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hasattr(signal, "valid_signals"),
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"requires signal.valid_signals"
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)
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def test_valid_signals(self):
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s = signal.valid_signals()
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self.assertIsInstance(s, set)
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self.assertIn(signal.Signals.SIGINT, s)
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self.assertIn(signal.Signals.SIGALRM, s)
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self.assertNotIn(0, s)
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self.assertNotIn(signal.NSIG, s)
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self.assertLess(len(s), signal.NSIG)
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# gh-91145: Make sure that all SIGxxx constants exposed by the Python
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# signal module have a number in the [0; signal.NSIG-1] range.
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for name in dir(signal):
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if not name.startswith("SIG"):
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continue
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if name in {"SIG_IGN", "SIG_DFL"}:
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# SIG_IGN and SIG_DFL are pointers
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continue
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with self.subTest(name=name):
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signum = getattr(signal, name)
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self.assertGreaterEqual(signum, 0)
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self.assertLess(signum, signal.NSIG)
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@unittest.skipUnless(sys.executable, "sys.executable required.")
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@support.requires_subprocess()
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def test_keyboard_interrupt_exit_code(self):
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"""KeyboardInterrupt triggers exit via SIGINT."""
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process = subprocess.run(
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[sys.executable, "-c",
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"import os, signal, time\n"
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"os.kill(os.getpid(), signal.SIGINT)\n"
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"for _ in range(999): time.sleep(0.01)"],
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stderr=subprocess.PIPE)
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self.assertIn(b"KeyboardInterrupt", process.stderr)
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self.assertEqual(process.returncode, -signal.SIGINT)
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# Caveat: The exit code is insufficient to guarantee we actually died
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# via a signal. POSIX shells do more than look at the 8 bit value.
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# Writing an automation friendly test of an interactive shell
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# to confirm that our process died via a SIGINT proved too complex.
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@unittest.skipUnless(sys.platform == "win32", "Windows specific")
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class WindowsSignalTests(unittest.TestCase):
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def test_valid_signals(self):
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s = signal.valid_signals()
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self.assertIsInstance(s, set)
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self.assertGreaterEqual(len(s), 6)
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self.assertIn(signal.Signals.SIGINT, s)
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self.assertNotIn(0, s)
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self.assertNotIn(signal.NSIG, s)
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self.assertLess(len(s), signal.NSIG)
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def test_issue9324(self):
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# Updated for issue #10003, adding SIGBREAK
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handler = lambda x, y: None
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checked = set()
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for sig in (signal.SIGABRT, signal.SIGBREAK, signal.SIGFPE,
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signal.SIGILL, signal.SIGINT, signal.SIGSEGV,
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signal.SIGTERM):
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# Set and then reset a handler for signals that work on windows.
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# Issue #18396, only for signals without a C-level handler.
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if signal.getsignal(sig) is not None:
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signal.signal(sig, signal.signal(sig, handler))
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checked.add(sig)
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# Issue #18396: Ensure the above loop at least tested *something*
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self.assertTrue(checked)
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with self.assertRaises(ValueError):
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signal.signal(-1, handler)
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with self.assertRaises(ValueError):
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signal.signal(7, handler)
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@unittest.skipUnless(sys.executable, "sys.executable required.")
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@support.requires_subprocess()
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def test_keyboard_interrupt_exit_code(self):
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"""KeyboardInterrupt triggers an exit using STATUS_CONTROL_C_EXIT."""
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# We don't test via os.kill(os.getpid(), signal.CTRL_C_EVENT) here
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# as that requires setting up a console control handler in a child
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# in its own process group. Doable, but quite complicated. (see
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# @eryksun on https://github.com/python/cpython/pull/11862)
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process = subprocess.run(
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[sys.executable, "-c", "raise KeyboardInterrupt"],
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stderr=subprocess.PIPE)
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self.assertIn(b"KeyboardInterrupt", process.stderr)
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STATUS_CONTROL_C_EXIT = 0xC000013A
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self.assertEqual(process.returncode, STATUS_CONTROL_C_EXIT)
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class WakeupFDTests(unittest.TestCase):
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def test_invalid_call(self):
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# First parameter is positional-only
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with self.assertRaises(TypeError):
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signal.set_wakeup_fd(signum=signal.SIGINT)
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# warn_on_full_buffer is a keyword-only parameter
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with self.assertRaises(TypeError):
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signal.set_wakeup_fd(signal.SIGINT, False)
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def test_invalid_fd(self):
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fd = os_helper.make_bad_fd()
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self.assertRaises((ValueError, OSError),
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signal.set_wakeup_fd, fd)
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@unittest.skipUnless(support.has_socket_support, "needs working sockets.")
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def test_invalid_socket(self):
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sock = socket.socket()
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fd = sock.fileno()
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sock.close()
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self.assertRaises((ValueError, OSError),
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signal.set_wakeup_fd, fd)
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# Emscripten does not support fstat on pipes yet.
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# https://github.com/emscripten-core/emscripten/issues/16414
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@unittest.skipIf(support.is_emscripten, "Emscripten cannot fstat pipes.")
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@unittest.skipUnless(hasattr(os, "pipe"), "requires os.pipe()")
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def test_set_wakeup_fd_result(self):
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r1, w1 = os.pipe()
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self.addCleanup(os.close, r1)
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self.addCleanup(os.close, w1)
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r2, w2 = os.pipe()
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self.addCleanup(os.close, r2)
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self.addCleanup(os.close, w2)
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if hasattr(os, 'set_blocking'):
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os.set_blocking(w1, False)
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os.set_blocking(w2, False)
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signal.set_wakeup_fd(w1)
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self.assertEqual(signal.set_wakeup_fd(w2), w1)
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self.assertEqual(signal.set_wakeup_fd(-1), w2)
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self.assertEqual(signal.set_wakeup_fd(-1), -1)
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@unittest.skipIf(support.is_emscripten, "Emscripten cannot fstat pipes.")
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@unittest.skipUnless(support.has_socket_support, "needs working sockets.")
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def test_set_wakeup_fd_socket_result(self):
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sock1 = socket.socket()
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self.addCleanup(sock1.close)
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sock1.setblocking(False)
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fd1 = sock1.fileno()
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sock2 = socket.socket()
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self.addCleanup(sock2.close)
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sock2.setblocking(False)
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fd2 = sock2.fileno()
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signal.set_wakeup_fd(fd1)
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self.assertEqual(signal.set_wakeup_fd(fd2), fd1)
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self.assertEqual(signal.set_wakeup_fd(-1), fd2)
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self.assertEqual(signal.set_wakeup_fd(-1), -1)
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# On Windows, files are always blocking and Windows does not provide a
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# function to test if a socket is in non-blocking mode.
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@unittest.skipIf(sys.platform == "win32", "tests specific to POSIX")
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@unittest.skipIf(support.is_emscripten, "Emscripten cannot fstat pipes.")
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@unittest.skipUnless(hasattr(os, "pipe"), "requires os.pipe()")
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def test_set_wakeup_fd_blocking(self):
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rfd, wfd = os.pipe()
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self.addCleanup(os.close, rfd)
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self.addCleanup(os.close, wfd)
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# fd must be non-blocking
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os.set_blocking(wfd, True)
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with self.assertRaises(ValueError) as cm:
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signal.set_wakeup_fd(wfd)
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self.assertEqual(str(cm.exception),
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"the fd %s must be in non-blocking mode" % wfd)
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|
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# non-blocking is ok
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os.set_blocking(wfd, False)
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signal.set_wakeup_fd(wfd)
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signal.set_wakeup_fd(-1)
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|
||
|
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@unittest.skipIf(sys.platform == "win32", "Not valid on Windows")
|
||
class WakeupSignalTests(unittest.TestCase):
|
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@unittest.skipIf(_testcapi is None, 'need _testcapi')
|
||
def check_wakeup(self, test_body, *signals, ordered=True):
|
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# use a subprocess to have only one thread
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code = """if 1:
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import _testcapi
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import os
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import signal
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import struct
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||
|
||
signals = {!r}
|
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|
||
def handler(signum, frame):
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||
pass
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def check_signum(signals):
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data = os.read(read, len(signals)+1)
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raised = struct.unpack('%uB' % len(data), data)
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if not {!r}:
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raised = set(raised)
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signals = set(signals)
|
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if raised != signals:
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raise Exception("%r != %r" % (raised, signals))
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|
||
{}
|
||
|
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signal.signal(signal.SIGALRM, handler)
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read, write = os.pipe()
|
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os.set_blocking(write, False)
|
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signal.set_wakeup_fd(write)
|
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|
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test()
|
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check_signum(signals)
|
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|
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os.close(read)
|
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os.close(write)
|
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""".format(tuple(map(int, signals)), ordered, test_body)
|
||
|
||
assert_python_ok('-c', code)
|
||
|
||
@unittest.skipIf(_testcapi is None, 'need _testcapi')
|
||
@unittest.skipUnless(hasattr(os, "pipe"), "requires os.pipe()")
|
||
def test_wakeup_write_error(self):
|
||
# Issue #16105: write() errors in the C signal handler should not
|
||
# pass silently.
|
||
# Use a subprocess to have only one thread.
|
||
code = """if 1:
|
||
import _testcapi
|
||
import errno
|
||
import os
|
||
import signal
|
||
import sys
|
||
from test.support import captured_stderr
|
||
|
||
def handler(signum, frame):
|
||
1/0
|
||
|
||
signal.signal(signal.SIGALRM, handler)
|
||
r, w = os.pipe()
|
||
os.set_blocking(r, False)
|
||
|
||
# Set wakeup_fd a read-only file descriptor to trigger the error
|
||
signal.set_wakeup_fd(r)
|
||
try:
|
||
with captured_stderr() as err:
|
||
signal.raise_signal(signal.SIGALRM)
|
||
except ZeroDivisionError:
|
||
# An ignored exception should have been printed out on stderr
|
||
err = err.getvalue()
|
||
if ('Exception ignored when trying to write to the signal wakeup fd'
|
||
not in err):
|
||
raise AssertionError(err)
|
||
if ('OSError: [Errno %d]' % errno.EBADF) not in err:
|
||
raise AssertionError(err)
|
||
else:
|
||
raise AssertionError("ZeroDivisionError not raised")
|
||
|
||
os.close(r)
|
||
os.close(w)
|
||
"""
|
||
r, w = os.pipe()
|
||
try:
|
||
os.write(r, b'x')
|
||
except OSError:
|
||
pass
|
||
else:
|
||
self.skipTest("OS doesn't report write() error on the read end of a pipe")
|
||
finally:
|
||
os.close(r)
|
||
os.close(w)
|
||
|
||
assert_python_ok('-c', code)
|
||
|
||
def test_wakeup_fd_early(self):
|
||
self.check_wakeup("""def test():
|
||
import select
|
||
import time
|
||
|
||
TIMEOUT_FULL = 10
|
||
TIMEOUT_HALF = 5
|
||
|
||
class InterruptSelect(Exception):
|
||
pass
|
||
|
||
def handler(signum, frame):
|
||
raise InterruptSelect
|
||
signal.signal(signal.SIGALRM, handler)
|
||
|
||
signal.alarm(1)
|
||
|
||
# We attempt to get a signal during the sleep,
|
||
# before select is called
|
||
try:
|
||
select.select([], [], [], TIMEOUT_FULL)
|
||
except InterruptSelect:
|
||
pass
|
||
else:
|
||
raise Exception("select() was not interrupted")
|
||
|
||
before_time = time.monotonic()
|
||
select.select([read], [], [], TIMEOUT_FULL)
|
||
after_time = time.monotonic()
|
||
dt = after_time - before_time
|
||
if dt >= TIMEOUT_HALF:
|
||
raise Exception("%s >= %s" % (dt, TIMEOUT_HALF))
|
||
""", signal.SIGALRM)
|
||
|
||
def test_wakeup_fd_during(self):
|
||
self.check_wakeup("""def test():
|
||
import select
|
||
import time
|
||
|
||
TIMEOUT_FULL = 10
|
||
TIMEOUT_HALF = 5
|
||
|
||
class InterruptSelect(Exception):
|
||
pass
|
||
|
||
def handler(signum, frame):
|
||
raise InterruptSelect
|
||
signal.signal(signal.SIGALRM, handler)
|
||
|
||
signal.alarm(1)
|
||
before_time = time.monotonic()
|
||
# We attempt to get a signal during the select call
|
||
try:
|
||
select.select([read], [], [], TIMEOUT_FULL)
|
||
except InterruptSelect:
|
||
pass
|
||
else:
|
||
raise Exception("select() was not interrupted")
|
||
after_time = time.monotonic()
|
||
dt = after_time - before_time
|
||
if dt >= TIMEOUT_HALF:
|
||
raise Exception("%s >= %s" % (dt, TIMEOUT_HALF))
|
||
""", signal.SIGALRM)
|
||
|
||
def test_signum(self):
|
||
self.check_wakeup("""def test():
|
||
signal.signal(signal.SIGUSR1, handler)
|
||
signal.raise_signal(signal.SIGUSR1)
|
||
signal.raise_signal(signal.SIGALRM)
|
||
""", signal.SIGUSR1, signal.SIGALRM)
|
||
|
||
@unittest.skipUnless(hasattr(signal, 'pthread_sigmask'),
|
||
'need signal.pthread_sigmask()')
|
||
def test_pending(self):
|
||
self.check_wakeup("""def test():
|
||
signum1 = signal.SIGUSR1
|
||
signum2 = signal.SIGUSR2
|
||
|
||
signal.signal(signum1, handler)
|
||
signal.signal(signum2, handler)
|
||
|
||
signal.pthread_sigmask(signal.SIG_BLOCK, (signum1, signum2))
|
||
signal.raise_signal(signum1)
|
||
signal.raise_signal(signum2)
|
||
# Unblocking the 2 signals calls the C signal handler twice
|
||
signal.pthread_sigmask(signal.SIG_UNBLOCK, (signum1, signum2))
|
||
""", signal.SIGUSR1, signal.SIGUSR2, ordered=False)
|
||
|
||
|
||
@unittest.skipUnless(hasattr(socket, 'socketpair'), 'need socket.socketpair')
|
||
class WakeupSocketSignalTests(unittest.TestCase):
|
||
|
||
@unittest.skipIf(_testcapi is None, 'need _testcapi')
|
||
def test_socket(self):
|
||
# use a subprocess to have only one thread
|
||
code = """if 1:
|
||
import signal
|
||
import socket
|
||
import struct
|
||
import _testcapi
|
||
|
||
signum = signal.SIGINT
|
||
signals = (signum,)
|
||
|
||
def handler(signum, frame):
|
||
pass
|
||
|
||
signal.signal(signum, handler)
|
||
|
||
read, write = socket.socketpair()
|
||
write.setblocking(False)
|
||
signal.set_wakeup_fd(write.fileno())
|
||
|
||
signal.raise_signal(signum)
|
||
|
||
data = read.recv(1)
|
||
if not data:
|
||
raise Exception("no signum written")
|
||
raised = struct.unpack('B', data)
|
||
if raised != signals:
|
||
raise Exception("%r != %r" % (raised, signals))
|
||
|
||
read.close()
|
||
write.close()
|
||
"""
|
||
|
||
assert_python_ok('-c', code)
|
||
|
||
@unittest.skipIf(_testcapi is None, 'need _testcapi')
|
||
def test_send_error(self):
|
||
# Use a subprocess to have only one thread.
|
||
if os.name == 'nt':
|
||
action = 'send'
|
||
else:
|
||
action = 'write'
|
||
code = """if 1:
|
||
import errno
|
||
import signal
|
||
import socket
|
||
import sys
|
||
import time
|
||
import _testcapi
|
||
from test.support import captured_stderr
|
||
|
||
signum = signal.SIGINT
|
||
|
||
def handler(signum, frame):
|
||
pass
|
||
|
||
signal.signal(signum, handler)
|
||
|
||
read, write = socket.socketpair()
|
||
read.setblocking(False)
|
||
write.setblocking(False)
|
||
|
||
signal.set_wakeup_fd(write.fileno())
|
||
|
||
# Close sockets: send() will fail
|
||
read.close()
|
||
write.close()
|
||
|
||
with captured_stderr() as err:
|
||
signal.raise_signal(signum)
|
||
|
||
err = err.getvalue()
|
||
if ('Exception ignored when trying to {action} to the signal wakeup fd'
|
||
not in err):
|
||
raise AssertionError(err)
|
||
""".format(action=action)
|
||
assert_python_ok('-c', code)
|
||
|
||
@unittest.skipIf(_testcapi is None, 'need _testcapi')
|
||
def test_warn_on_full_buffer(self):
|
||
# Use a subprocess to have only one thread.
|
||
if os.name == 'nt':
|
||
action = 'send'
|
||
else:
|
||
action = 'write'
|
||
code = """if 1:
|
||
import errno
|
||
import signal
|
||
import socket
|
||
import sys
|
||
import time
|
||
import _testcapi
|
||
from test.support import captured_stderr
|
||
|
||
signum = signal.SIGINT
|
||
|
||
# This handler will be called, but we intentionally won't read from
|
||
# the wakeup fd.
|
||
def handler(signum, frame):
|
||
pass
|
||
|
||
signal.signal(signum, handler)
|
||
|
||
read, write = socket.socketpair()
|
||
|
||
# Fill the socketpair buffer
|
||
if sys.platform == 'win32':
|
||
# bpo-34130: On Windows, sometimes non-blocking send fails to fill
|
||
# the full socketpair buffer, so use a timeout of 50 ms instead.
|
||
write.settimeout(0.050)
|
||
else:
|
||
write.setblocking(False)
|
||
|
||
written = 0
|
||
if sys.platform == "vxworks":
|
||
CHUNK_SIZES = (1,)
|
||
else:
|
||
# Start with large chunk size to reduce the
|
||
# number of send needed to fill the buffer.
|
||
CHUNK_SIZES = (2 ** 16, 2 ** 8, 1)
|
||
for chunk_size in CHUNK_SIZES:
|
||
chunk = b"x" * chunk_size
|
||
try:
|
||
while True:
|
||
write.send(chunk)
|
||
written += chunk_size
|
||
except (BlockingIOError, TimeoutError):
|
||
pass
|
||
|
||
print(f"%s bytes written into the socketpair" % written, flush=True)
|
||
|
||
write.setblocking(False)
|
||
try:
|
||
write.send(b"x")
|
||
except BlockingIOError:
|
||
# The socketpair buffer seems full
|
||
pass
|
||
else:
|
||
raise AssertionError("%s bytes failed to fill the socketpair "
|
||
"buffer" % written)
|
||
|
||
# By default, we get a warning when a signal arrives
|
||
msg = ('Exception ignored when trying to {action} '
|
||
'to the signal wakeup fd')
|
||
signal.set_wakeup_fd(write.fileno())
|
||
|
||
with captured_stderr() as err:
|
||
signal.raise_signal(signum)
|
||
|
||
err = err.getvalue()
|
||
if msg not in err:
|
||
raise AssertionError("first set_wakeup_fd() test failed, "
|
||
"stderr: %r" % err)
|
||
|
||
# And also if warn_on_full_buffer=True
|
||
signal.set_wakeup_fd(write.fileno(), warn_on_full_buffer=True)
|
||
|
||
with captured_stderr() as err:
|
||
signal.raise_signal(signum)
|
||
|
||
err = err.getvalue()
|
||
if msg not in err:
|
||
raise AssertionError("set_wakeup_fd(warn_on_full_buffer=True) "
|
||
"test failed, stderr: %r" % err)
|
||
|
||
# But not if warn_on_full_buffer=False
|
||
signal.set_wakeup_fd(write.fileno(), warn_on_full_buffer=False)
|
||
|
||
with captured_stderr() as err:
|
||
signal.raise_signal(signum)
|
||
|
||
err = err.getvalue()
|
||
if err != "":
|
||
raise AssertionError("set_wakeup_fd(warn_on_full_buffer=False) "
|
||
"test failed, stderr: %r" % err)
|
||
|
||
# And then check the default again, to make sure warn_on_full_buffer
|
||
# settings don't leak across calls.
|
||
signal.set_wakeup_fd(write.fileno())
|
||
|
||
with captured_stderr() as err:
|
||
signal.raise_signal(signum)
|
||
|
||
err = err.getvalue()
|
||
if msg not in err:
|
||
raise AssertionError("second set_wakeup_fd() test failed, "
|
||
"stderr: %r" % err)
|
||
|
||
""".format(action=action)
|
||
assert_python_ok('-c', code)
|
||
|
||
|
||
@unittest.skipIf(sys.platform == "win32", "Not valid on Windows")
|
||
@unittest.skipUnless(hasattr(signal, 'siginterrupt'), "needs signal.siginterrupt()")
|
||
@support.requires_subprocess()
|
||
@unittest.skipUnless(hasattr(os, "pipe"), "requires os.pipe()")
|
||
class SiginterruptTest(unittest.TestCase):
|
||
|
||
def readpipe_interrupted(self, interrupt, timeout=support.SHORT_TIMEOUT):
|
||
"""Perform a read during which a signal will arrive. Return True if the
|
||
read is interrupted by the signal and raises an exception. Return False
|
||
if it returns normally.
|
||
"""
|
||
# use a subprocess to have only one thread, to have a timeout on the
|
||
# blocking read and to not touch signal handling in this process
|
||
code = """if 1:
|
||
import errno
|
||
import os
|
||
import signal
|
||
import sys
|
||
|
||
interrupt = %r
|
||
r, w = os.pipe()
|
||
|
||
def handler(signum, frame):
|
||
1 / 0
|
||
|
||
signal.signal(signal.SIGALRM, handler)
|
||
if interrupt is not None:
|
||
signal.siginterrupt(signal.SIGALRM, interrupt)
|
||
|
||
print("ready")
|
||
sys.stdout.flush()
|
||
|
||
# run the test twice
|
||
try:
|
||
for loop in range(2):
|
||
# send a SIGALRM in a second (during the read)
|
||
signal.alarm(1)
|
||
try:
|
||
# blocking call: read from a pipe without data
|
||
os.read(r, 1)
|
||
except ZeroDivisionError:
|
||
pass
|
||
else:
|
||
sys.exit(2)
|
||
sys.exit(3)
|
||
finally:
|
||
os.close(r)
|
||
os.close(w)
|
||
""" % (interrupt,)
|
||
with spawn_python('-c', code) as process:
|
||
try:
|
||
# wait until the child process is loaded and has started
|
||
first_line = process.stdout.readline()
|
||
|
||
stdout, stderr = process.communicate(timeout=timeout)
|
||
except subprocess.TimeoutExpired:
|
||
process.kill()
|
||
return False
|
||
else:
|
||
stdout = first_line + stdout
|
||
exitcode = process.wait()
|
||
if exitcode not in (2, 3):
|
||
raise Exception("Child error (exit code %s): %r"
|
||
% (exitcode, stdout))
|
||
return (exitcode == 3)
|
||
|
||
def test_without_siginterrupt(self):
|
||
# If a signal handler is installed and siginterrupt is not called
|
||
# at all, when that signal arrives, it interrupts a syscall that's in
|
||
# progress.
|
||
interrupted = self.readpipe_interrupted(None)
|
||
self.assertTrue(interrupted)
|
||
|
||
def test_siginterrupt_on(self):
|
||
# If a signal handler is installed and siginterrupt is called with
|
||
# a true value for the second argument, when that signal arrives, it
|
||
# interrupts a syscall that's in progress.
|
||
interrupted = self.readpipe_interrupted(True)
|
||
self.assertTrue(interrupted)
|
||
|
||
@support.requires_resource('walltime')
|
||
def test_siginterrupt_off(self):
|
||
# If a signal handler is installed and siginterrupt is called with
|
||
# a false value for the second argument, when that signal arrives, it
|
||
# does not interrupt a syscall that's in progress.
|
||
interrupted = self.readpipe_interrupted(False, timeout=2)
|
||
self.assertFalse(interrupted)
|
||
|
||
|
||
@unittest.skipIf(sys.platform == "win32", "Not valid on Windows")
|
||
@unittest.skipUnless(hasattr(signal, 'getitimer') and hasattr(signal, 'setitimer'),
|
||
"needs signal.getitimer() and signal.setitimer()")
|
||
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
|
||
|
||
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)
|
||
|
||
self.hndl_count += 1
|
||
|
||
def sig_prof(self, *args):
|
||
self.hndl_called = True
|
||
signal.setitimer(signal.ITIMER_PROF, 0)
|
||
|
||
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)
|
||
signal.pause()
|
||
self.assertEqual(self.hndl_called, True)
|
||
|
||
# Issue 3864, unknown if this affects earlier versions of freebsd also
|
||
@unittest.skipIf(sys.platform in ('netbsd5',) or is_apple_mobile,
|
||
'itimer not reliable (does not mix well with threading) on some BSDs.')
|
||
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 _ in support.busy_retry(support.LONG_TIMEOUT):
|
||
# use up some virtual time by doing real work
|
||
_ = pow(12345, 67890, 10000019)
|
||
if signal.getitimer(self.itimer) == (0.0, 0.0):
|
||
# sig_vtalrm handler stopped this itimer
|
||
break
|
||
|
||
# virtual itimer should be (0.0, 0.0) now
|
||
self.assertEqual(signal.getitimer(self.itimer), (0.0, 0.0))
|
||
# and the handler should have been called
|
||
self.assertEqual(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 _ in support.busy_retry(support.LONG_TIMEOUT):
|
||
# do some work
|
||
_ = pow(12345, 67890, 10000019)
|
||
if signal.getitimer(self.itimer) == (0.0, 0.0):
|
||
# sig_prof handler stopped this itimer
|
||
break
|
||
|
||
# profiling itimer should be (0.0, 0.0) now
|
||
self.assertEqual(signal.getitimer(self.itimer), (0.0, 0.0))
|
||
# and the handler should have been called
|
||
self.assertEqual(self.hndl_called, True)
|
||
|
||
def test_setitimer_tiny(self):
|
||
# bpo-30807: C setitimer() takes a microsecond-resolution interval.
|
||
# Check that float -> timeval conversion doesn't round
|
||
# the interval down to zero, which would disable the timer.
|
||
self.itimer = signal.ITIMER_REAL
|
||
signal.setitimer(self.itimer, 1e-6)
|
||
time.sleep(1)
|
||
self.assertEqual(self.hndl_called, True)
|
||
|
||
|
||
class PendingSignalsTests(unittest.TestCase):
|
||
"""
|
||
Test pthread_sigmask(), pthread_kill(), sigpending() and sigwait()
|
||
functions.
|
||
"""
|
||
@unittest.skipUnless(hasattr(signal, 'sigpending'),
|
||
'need signal.sigpending()')
|
||
def test_sigpending_empty(self):
|
||
self.assertEqual(signal.sigpending(), set())
|
||
|
||
@unittest.skipUnless(hasattr(signal, 'pthread_sigmask'),
|
||
'need signal.pthread_sigmask()')
|
||
@unittest.skipUnless(hasattr(signal, 'sigpending'),
|
||
'need signal.sigpending()')
|
||
def test_sigpending(self):
|
||
code = """if 1:
|
||
import os
|
||
import signal
|
||
|
||
def handler(signum, frame):
|
||
1/0
|
||
|
||
signum = signal.SIGUSR1
|
||
signal.signal(signum, handler)
|
||
|
||
signal.pthread_sigmask(signal.SIG_BLOCK, [signum])
|
||
os.kill(os.getpid(), signum)
|
||
pending = signal.sigpending()
|
||
for sig in pending:
|
||
assert isinstance(sig, signal.Signals), repr(pending)
|
||
if pending != {signum}:
|
||
raise Exception('%s != {%s}' % (pending, signum))
|
||
try:
|
||
signal.pthread_sigmask(signal.SIG_UNBLOCK, [signum])
|
||
except ZeroDivisionError:
|
||
pass
|
||
else:
|
||
raise Exception("ZeroDivisionError not raised")
|
||
"""
|
||
assert_python_ok('-c', code)
|
||
|
||
@unittest.skipUnless(hasattr(signal, 'pthread_kill'),
|
||
'need signal.pthread_kill()')
|
||
@threading_helper.requires_working_threading()
|
||
def test_pthread_kill(self):
|
||
code = """if 1:
|
||
import signal
|
||
import threading
|
||
import sys
|
||
|
||
signum = signal.SIGUSR1
|
||
|
||
def handler(signum, frame):
|
||
1/0
|
||
|
||
signal.signal(signum, handler)
|
||
|
||
tid = threading.get_ident()
|
||
try:
|
||
signal.pthread_kill(tid, signum)
|
||
except ZeroDivisionError:
|
||
pass
|
||
else:
|
||
raise Exception("ZeroDivisionError not raised")
|
||
"""
|
||
assert_python_ok('-c', code)
|
||
|
||
@unittest.skipUnless(hasattr(signal, 'pthread_sigmask'),
|
||
'need signal.pthread_sigmask()')
|
||
def wait_helper(self, blocked, test):
|
||
"""
|
||
test: body of the "def test(signum):" function.
|
||
blocked: number of the blocked signal
|
||
"""
|
||
code = '''if 1:
|
||
import signal
|
||
import sys
|
||
from signal import Signals
|
||
|
||
def handler(signum, frame):
|
||
1/0
|
||
|
||
%s
|
||
|
||
blocked = %s
|
||
signum = signal.SIGALRM
|
||
|
||
# child: block and wait the signal
|
||
try:
|
||
signal.signal(signum, handler)
|
||
signal.pthread_sigmask(signal.SIG_BLOCK, [blocked])
|
||
|
||
# Do the tests
|
||
test(signum)
|
||
|
||
# The handler must not be called on unblock
|
||
try:
|
||
signal.pthread_sigmask(signal.SIG_UNBLOCK, [blocked])
|
||
except ZeroDivisionError:
|
||
print("the signal handler has been called",
|
||
file=sys.stderr)
|
||
sys.exit(1)
|
||
except BaseException as err:
|
||
print("error: {}".format(err), file=sys.stderr)
|
||
sys.stderr.flush()
|
||
sys.exit(1)
|
||
''' % (test.strip(), blocked)
|
||
|
||
# sig*wait* must be called with the signal blocked: since the current
|
||
# process might have several threads running, use a subprocess to have
|
||
# a single thread.
|
||
assert_python_ok('-c', code)
|
||
|
||
@unittest.skipUnless(hasattr(signal, 'sigwait'),
|
||
'need signal.sigwait()')
|
||
def test_sigwait(self):
|
||
self.wait_helper(signal.SIGALRM, '''
|
||
def test(signum):
|
||
signal.alarm(1)
|
||
received = signal.sigwait([signum])
|
||
assert isinstance(received, signal.Signals), received
|
||
if received != signum:
|
||
raise Exception('received %s, not %s' % (received, signum))
|
||
''')
|
||
|
||
@unittest.skipUnless(hasattr(signal, 'sigwaitinfo'),
|
||
'need signal.sigwaitinfo()')
|
||
def test_sigwaitinfo(self):
|
||
self.wait_helper(signal.SIGALRM, '''
|
||
def test(signum):
|
||
signal.alarm(1)
|
||
info = signal.sigwaitinfo([signum])
|
||
if info.si_signo != signum:
|
||
raise Exception("info.si_signo != %s" % signum)
|
||
''')
|
||
|
||
@unittest.skipUnless(hasattr(signal, 'sigtimedwait'),
|
||
'need signal.sigtimedwait()')
|
||
def test_sigtimedwait(self):
|
||
self.wait_helper(signal.SIGALRM, '''
|
||
def test(signum):
|
||
signal.alarm(1)
|
||
info = signal.sigtimedwait([signum], 10.1000)
|
||
if info.si_signo != signum:
|
||
raise Exception('info.si_signo != %s' % signum)
|
||
''')
|
||
|
||
@unittest.skipUnless(hasattr(signal, 'sigtimedwait'),
|
||
'need signal.sigtimedwait()')
|
||
def test_sigtimedwait_poll(self):
|
||
# check that polling with sigtimedwait works
|
||
self.wait_helper(signal.SIGALRM, '''
|
||
def test(signum):
|
||
import os
|
||
os.kill(os.getpid(), signum)
|
||
info = signal.sigtimedwait([signum], 0)
|
||
if info.si_signo != signum:
|
||
raise Exception('info.si_signo != %s' % signum)
|
||
''')
|
||
|
||
@unittest.skipUnless(hasattr(signal, 'sigtimedwait'),
|
||
'need signal.sigtimedwait()')
|
||
def test_sigtimedwait_timeout(self):
|
||
self.wait_helper(signal.SIGALRM, '''
|
||
def test(signum):
|
||
received = signal.sigtimedwait([signum], 1.0)
|
||
if received is not None:
|
||
raise Exception("received=%r" % (received,))
|
||
''')
|
||
|
||
@unittest.skipUnless(hasattr(signal, 'sigtimedwait'),
|
||
'need signal.sigtimedwait()')
|
||
def test_sigtimedwait_negative_timeout(self):
|
||
signum = signal.SIGALRM
|
||
self.assertRaises(ValueError, signal.sigtimedwait, [signum], -1.0)
|
||
|
||
@unittest.skipUnless(hasattr(signal, 'sigwait'),
|
||
'need signal.sigwait()')
|
||
@unittest.skipUnless(hasattr(signal, 'pthread_sigmask'),
|
||
'need signal.pthread_sigmask()')
|
||
@threading_helper.requires_working_threading()
|
||
def test_sigwait_thread(self):
|
||
# Check that calling sigwait() from a thread doesn't suspend the whole
|
||
# process. A new interpreter is spawned to avoid problems when mixing
|
||
# threads and fork(): only async-safe functions are allowed between
|
||
# fork() and exec().
|
||
assert_python_ok("-c", """if True:
|
||
import os, threading, sys, time, signal
|
||
|
||
# the default handler terminates the process
|
||
signum = signal.SIGUSR1
|
||
|
||
def kill_later():
|
||
# wait until the main thread is waiting in sigwait()
|
||
time.sleep(1)
|
||
os.kill(os.getpid(), signum)
|
||
|
||
# the signal must be blocked by all the threads
|
||
signal.pthread_sigmask(signal.SIG_BLOCK, [signum])
|
||
killer = threading.Thread(target=kill_later)
|
||
killer.start()
|
||
received = signal.sigwait([signum])
|
||
if received != signum:
|
||
print("sigwait() received %s, not %s" % (received, signum),
|
||
file=sys.stderr)
|
||
sys.exit(1)
|
||
killer.join()
|
||
# unblock the signal, which should have been cleared by sigwait()
|
||
signal.pthread_sigmask(signal.SIG_UNBLOCK, [signum])
|
||
""")
|
||
|
||
@unittest.skipUnless(hasattr(signal, 'pthread_sigmask'),
|
||
'need signal.pthread_sigmask()')
|
||
def test_pthread_sigmask_arguments(self):
|
||
self.assertRaises(TypeError, signal.pthread_sigmask)
|
||
self.assertRaises(TypeError, signal.pthread_sigmask, 1)
|
||
self.assertRaises(TypeError, signal.pthread_sigmask, 1, 2, 3)
|
||
self.assertRaises(OSError, signal.pthread_sigmask, 1700, [])
|
||
with self.assertRaises(ValueError):
|
||
signal.pthread_sigmask(signal.SIG_BLOCK, [signal.NSIG])
|
||
with self.assertRaises(ValueError):
|
||
signal.pthread_sigmask(signal.SIG_BLOCK, [0])
|
||
with self.assertRaises(ValueError):
|
||
signal.pthread_sigmask(signal.SIG_BLOCK, [1<<1000])
|
||
|
||
@unittest.skipUnless(hasattr(signal, 'pthread_sigmask'),
|
||
'need signal.pthread_sigmask()')
|
||
def test_pthread_sigmask_valid_signals(self):
|
||
s = signal.pthread_sigmask(signal.SIG_BLOCK, signal.valid_signals())
|
||
self.addCleanup(signal.pthread_sigmask, signal.SIG_SETMASK, s)
|
||
# Get current blocked set
|
||
s = signal.pthread_sigmask(signal.SIG_UNBLOCK, signal.valid_signals())
|
||
self.assertLessEqual(s, signal.valid_signals())
|
||
|
||
@unittest.skipUnless(hasattr(signal, 'pthread_sigmask'),
|
||
'need signal.pthread_sigmask()')
|
||
@threading_helper.requires_working_threading()
|
||
def test_pthread_sigmask(self):
|
||
code = """if 1:
|
||
import signal
|
||
import os; import threading
|
||
|
||
def handler(signum, frame):
|
||
1/0
|
||
|
||
def kill(signum):
|
||
os.kill(os.getpid(), signum)
|
||
|
||
def check_mask(mask):
|
||
for sig in mask:
|
||
assert isinstance(sig, signal.Signals), repr(sig)
|
||
|
||
def read_sigmask():
|
||
sigmask = signal.pthread_sigmask(signal.SIG_BLOCK, [])
|
||
check_mask(sigmask)
|
||
return sigmask
|
||
|
||
signum = signal.SIGUSR1
|
||
|
||
# Install our signal handler
|
||
old_handler = signal.signal(signum, handler)
|
||
|
||
# Unblock SIGUSR1 (and copy the old mask) to test our signal handler
|
||
old_mask = signal.pthread_sigmask(signal.SIG_UNBLOCK, [signum])
|
||
check_mask(old_mask)
|
||
try:
|
||
kill(signum)
|
||
except ZeroDivisionError:
|
||
pass
|
||
else:
|
||
raise Exception("ZeroDivisionError not raised")
|
||
|
||
# Block and then raise SIGUSR1. The signal is blocked: the signal
|
||
# handler is not called, and the signal is now pending
|
||
mask = signal.pthread_sigmask(signal.SIG_BLOCK, [signum])
|
||
check_mask(mask)
|
||
kill(signum)
|
||
|
||
# Check the new mask
|
||
blocked = read_sigmask()
|
||
check_mask(blocked)
|
||
if signum not in blocked:
|
||
raise Exception("%s not in %s" % (signum, blocked))
|
||
if old_mask ^ blocked != {signum}:
|
||
raise Exception("%s ^ %s != {%s}" % (old_mask, blocked, signum))
|
||
|
||
# Unblock SIGUSR1
|
||
try:
|
||
# unblock the pending signal calls immediately the signal handler
|
||
signal.pthread_sigmask(signal.SIG_UNBLOCK, [signum])
|
||
except ZeroDivisionError:
|
||
pass
|
||
else:
|
||
raise Exception("ZeroDivisionError not raised")
|
||
try:
|
||
kill(signum)
|
||
except ZeroDivisionError:
|
||
pass
|
||
else:
|
||
raise Exception("ZeroDivisionError not raised")
|
||
|
||
# Check the new mask
|
||
unblocked = read_sigmask()
|
||
if signum in unblocked:
|
||
raise Exception("%s in %s" % (signum, unblocked))
|
||
if blocked ^ unblocked != {signum}:
|
||
raise Exception("%s ^ %s != {%s}" % (blocked, unblocked, signum))
|
||
if old_mask != unblocked:
|
||
raise Exception("%s != %s" % (old_mask, unblocked))
|
||
"""
|
||
assert_python_ok('-c', code)
|
||
|
||
@unittest.skipUnless(hasattr(signal, 'pthread_kill'),
|
||
'need signal.pthread_kill()')
|
||
@threading_helper.requires_working_threading()
|
||
def test_pthread_kill_main_thread(self):
|
||
# Test that a signal can be sent to the main thread with pthread_kill()
|
||
# before any other thread has been created (see issue #12392).
|
||
code = """if True:
|
||
import threading
|
||
import signal
|
||
import sys
|
||
|
||
def handler(signum, frame):
|
||
sys.exit(3)
|
||
|
||
signal.signal(signal.SIGUSR1, handler)
|
||
signal.pthread_kill(threading.get_ident(), signal.SIGUSR1)
|
||
sys.exit(2)
|
||
"""
|
||
|
||
with spawn_python('-c', code) as process:
|
||
stdout, stderr = process.communicate()
|
||
exitcode = process.wait()
|
||
if exitcode != 3:
|
||
raise Exception("Child error (exit code %s): %s" %
|
||
(exitcode, stdout))
|
||
|
||
|
||
class StressTest(unittest.TestCase):
|
||
"""
|
||
Stress signal delivery, especially when a signal arrives in
|
||
the middle of recomputing the signal state or executing
|
||
previously tripped signal handlers.
|
||
"""
|
||
|
||
def setsig(self, signum, handler):
|
||
old_handler = signal.signal(signum, handler)
|
||
self.addCleanup(signal.signal, signum, old_handler)
|
||
|
||
def measure_itimer_resolution(self):
|
||
N = 20
|
||
times = []
|
||
|
||
def handler(signum=None, frame=None):
|
||
if len(times) < N:
|
||
times.append(time.perf_counter())
|
||
# 1 µs is the smallest possible timer interval,
|
||
# we want to measure what the concrete duration
|
||
# will be on this platform
|
||
signal.setitimer(signal.ITIMER_REAL, 1e-6)
|
||
|
||
self.addCleanup(signal.setitimer, signal.ITIMER_REAL, 0)
|
||
self.setsig(signal.SIGALRM, handler)
|
||
handler()
|
||
while len(times) < N:
|
||
time.sleep(1e-3)
|
||
|
||
durations = [times[i+1] - times[i] for i in range(len(times) - 1)]
|
||
med = statistics.median(durations)
|
||
if support.verbose:
|
||
print("detected median itimer() resolution: %.6f s." % (med,))
|
||
return med
|
||
|
||
def decide_itimer_count(self):
|
||
# Some systems have poor setitimer() resolution (for example
|
||
# measured around 20 ms. on FreeBSD 9), so decide on a reasonable
|
||
# number of sequential timers based on that.
|
||
reso = self.measure_itimer_resolution()
|
||
if reso <= 1e-4:
|
||
return 10000
|
||
elif reso <= 1e-2:
|
||
return 100
|
||
else:
|
||
self.skipTest("detected itimer resolution (%.3f s.) too high "
|
||
"(> 10 ms.) on this platform (or system too busy)"
|
||
% (reso,))
|
||
|
||
@unittest.skipUnless(hasattr(signal, "setitimer"),
|
||
"test needs setitimer()")
|
||
def test_stress_delivery_dependent(self):
|
||
"""
|
||
This test uses dependent signal handlers.
|
||
"""
|
||
N = self.decide_itimer_count()
|
||
sigs = []
|
||
|
||
def first_handler(signum, frame):
|
||
# 1e-6 is the minimum non-zero value for `setitimer()`.
|
||
# Choose a random delay so as to improve chances of
|
||
# triggering a race condition. Ideally the signal is received
|
||
# when inside critical signal-handling routines such as
|
||
# Py_MakePendingCalls().
|
||
signal.setitimer(signal.ITIMER_REAL, 1e-6 + random.random() * 1e-5)
|
||
|
||
def second_handler(signum=None, frame=None):
|
||
sigs.append(signum)
|
||
|
||
# Here on Linux, SIGPROF > SIGALRM > SIGUSR1. By using both
|
||
# ascending and descending sequences (SIGUSR1 then SIGALRM,
|
||
# SIGPROF then SIGALRM), we maximize chances of hitting a bug.
|
||
self.setsig(signal.SIGPROF, first_handler)
|
||
self.setsig(signal.SIGUSR1, first_handler)
|
||
self.setsig(signal.SIGALRM, second_handler) # for ITIMER_REAL
|
||
|
||
expected_sigs = 0
|
||
deadline = time.monotonic() + support.SHORT_TIMEOUT
|
||
|
||
while expected_sigs < N:
|
||
os.kill(os.getpid(), signal.SIGPROF)
|
||
expected_sigs += 1
|
||
# Wait for handlers to run to avoid signal coalescing
|
||
while len(sigs) < expected_sigs and time.monotonic() < deadline:
|
||
time.sleep(1e-5)
|
||
|
||
os.kill(os.getpid(), signal.SIGUSR1)
|
||
expected_sigs += 1
|
||
while len(sigs) < expected_sigs and time.monotonic() < deadline:
|
||
time.sleep(1e-5)
|
||
|
||
# All ITIMER_REAL signals should have been delivered to the
|
||
# Python handler
|
||
self.assertEqual(len(sigs), N, "Some signals were lost")
|
||
|
||
@unittest.skipUnless(hasattr(signal, "setitimer"),
|
||
"test needs setitimer()")
|
||
def test_stress_delivery_simultaneous(self):
|
||
"""
|
||
This test uses simultaneous signal handlers.
|
||
"""
|
||
N = self.decide_itimer_count()
|
||
sigs = []
|
||
|
||
def handler(signum, frame):
|
||
sigs.append(signum)
|
||
|
||
# On Android, SIGUSR1 is unreliable when used in close proximity to
|
||
# another signal – see Android/testbed/app/src/main/python/main.py.
|
||
# So we use a different signal.
|
||
self.setsig(signal.SIGUSR2, handler)
|
||
self.setsig(signal.SIGALRM, handler) # for ITIMER_REAL
|
||
|
||
expected_sigs = 0
|
||
while expected_sigs < N:
|
||
# Hopefully the SIGALRM will be received somewhere during
|
||
# initial processing of SIGUSR2.
|
||
signal.setitimer(signal.ITIMER_REAL, 1e-6 + random.random() * 1e-5)
|
||
os.kill(os.getpid(), signal.SIGUSR2)
|
||
|
||
expected_sigs += 2
|
||
# Wait for handlers to run to avoid signal coalescing
|
||
for _ in support.sleeping_retry(support.SHORT_TIMEOUT):
|
||
if len(sigs) >= expected_sigs:
|
||
break
|
||
|
||
# All ITIMER_REAL signals should have been delivered to the
|
||
# Python handler
|
||
self.assertEqual(len(sigs), N, "Some signals were lost")
|
||
|
||
@support.requires_gil_enabled("gh-121065: test is flaky on free-threaded build")
|
||
@unittest.skipIf(is_apple, "crashes due to system bug (FB13453490)")
|
||
@unittest.skipUnless(hasattr(signal, "SIGUSR1"),
|
||
"test needs SIGUSR1")
|
||
@threading_helper.requires_working_threading()
|
||
def test_stress_modifying_handlers(self):
|
||
# bpo-43406: race condition between trip_signal() and signal.signal
|
||
signum = signal.SIGUSR1
|
||
num_sent_signals = 0
|
||
num_received_signals = 0
|
||
do_stop = False
|
||
|
||
def custom_handler(signum, frame):
|
||
nonlocal num_received_signals
|
||
num_received_signals += 1
|
||
|
||
def set_interrupts():
|
||
nonlocal num_sent_signals
|
||
while not do_stop:
|
||
signal.raise_signal(signum)
|
||
num_sent_signals += 1
|
||
|
||
def cycle_handlers():
|
||
while num_sent_signals < 100 or num_received_signals < 1:
|
||
for i in range(20000):
|
||
# Cycle between a Python-defined and a non-Python handler
|
||
for handler in [custom_handler, signal.SIG_IGN]:
|
||
signal.signal(signum, handler)
|
||
|
||
old_handler = signal.signal(signum, custom_handler)
|
||
self.addCleanup(signal.signal, signum, old_handler)
|
||
|
||
t = threading.Thread(target=set_interrupts)
|
||
try:
|
||
ignored = False
|
||
with support.catch_unraisable_exception() as cm:
|
||
t.start()
|
||
cycle_handlers()
|
||
do_stop = True
|
||
t.join()
|
||
|
||
if cm.unraisable is not None:
|
||
# An unraisable exception may be printed out when
|
||
# a signal is ignored due to the aforementioned
|
||
# race condition, check it.
|
||
self.assertIsInstance(cm.unraisable.exc_value, OSError)
|
||
self.assertIn(
|
||
f"Signal {signum:d} ignored due to race condition",
|
||
str(cm.unraisable.exc_value))
|
||
ignored = True
|
||
|
||
# bpo-43406: Even if it is unlikely, it's technically possible that
|
||
# all signals were ignored because of race conditions.
|
||
if not ignored:
|
||
# Sanity check that some signals were received, but not all
|
||
self.assertGreater(num_received_signals, 0)
|
||
self.assertLessEqual(num_received_signals, num_sent_signals)
|
||
finally:
|
||
do_stop = True
|
||
t.join()
|
||
|
||
|
||
class RaiseSignalTest(unittest.TestCase):
|
||
|
||
def test_sigint(self):
|
||
with self.assertRaises(KeyboardInterrupt):
|
||
signal.raise_signal(signal.SIGINT)
|
||
|
||
@unittest.skipIf(sys.platform != "win32", "Windows specific test")
|
||
def test_invalid_argument(self):
|
||
try:
|
||
SIGHUP = 1 # not supported on win32
|
||
signal.raise_signal(SIGHUP)
|
||
self.fail("OSError (Invalid argument) expected")
|
||
except OSError as e:
|
||
if e.errno == errno.EINVAL:
|
||
pass
|
||
else:
|
||
raise
|
||
|
||
def test_handler(self):
|
||
is_ok = False
|
||
def handler(a, b):
|
||
nonlocal is_ok
|
||
is_ok = True
|
||
old_signal = signal.signal(signal.SIGINT, handler)
|
||
self.addCleanup(signal.signal, signal.SIGINT, old_signal)
|
||
|
||
signal.raise_signal(signal.SIGINT)
|
||
self.assertTrue(is_ok)
|
||
|
||
def test__thread_interrupt_main(self):
|
||
# See https://github.com/python/cpython/issues/102397
|
||
code = """if 1:
|
||
import _thread
|
||
class Foo():
|
||
def __del__(self):
|
||
_thread.interrupt_main()
|
||
|
||
x = Foo()
|
||
"""
|
||
|
||
rc, out, err = assert_python_ok('-c', code)
|
||
self.assertIn(b'OSError: Signal 2 ignored due to race condition', err)
|
||
|
||
|
||
|
||
class PidfdSignalTest(unittest.TestCase):
|
||
|
||
@unittest.skipUnless(
|
||
hasattr(signal, "pidfd_send_signal"),
|
||
"pidfd support not built in",
|
||
)
|
||
def test_pidfd_send_signal(self):
|
||
with self.assertRaises(OSError) as cm:
|
||
signal.pidfd_send_signal(0, signal.SIGINT)
|
||
if cm.exception.errno == errno.ENOSYS:
|
||
self.skipTest("kernel does not support pidfds")
|
||
elif cm.exception.errno == errno.EPERM:
|
||
self.skipTest("Not enough privileges to use pidfs")
|
||
self.assertEqual(cm.exception.errno, errno.EBADF)
|
||
my_pidfd = os.open(f'/proc/{os.getpid()}', os.O_DIRECTORY)
|
||
self.addCleanup(os.close, my_pidfd)
|
||
with self.assertRaisesRegex(TypeError, "^siginfo must be None$"):
|
||
signal.pidfd_send_signal(my_pidfd, signal.SIGINT, object(), 0)
|
||
with self.assertRaises(KeyboardInterrupt):
|
||
signal.pidfd_send_signal(my_pidfd, signal.SIGINT)
|
||
|
||
def tearDownModule():
|
||
support.reap_children()
|
||
|
||
if __name__ == "__main__":
|
||
unittest.main()
|