1182 lines
40 KiB
Python
1182 lines
40 KiB
Python
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.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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@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 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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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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# 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(sys.platform == "win32", "Windows specific")
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class WindowsSignalTests(unittest.TestCase):
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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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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 = support.make_bad_fd()
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self.assertRaises((ValueError, OSError),
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signal.set_wakeup_fd, fd)
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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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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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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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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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# 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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@unittest.skipIf(sys.platform == "win32", "Not valid on Windows")
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class WakeupSignalTests(unittest.TestCase):
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@unittest.skipIf(_testcapi is None, 'need _testcapi')
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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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test()
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check_signum(signals)
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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)
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assert_python_ok('-c', code)
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@unittest.skipIf(_testcapi is None, 'need _testcapi')
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def test_wakeup_write_error(self):
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# Issue #16105: write() errors in the C signal handler should not
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# pass silently.
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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 errno
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import os
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import signal
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import sys
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from test.support import captured_stderr
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def handler(signum, frame):
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1/0
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signal.signal(signal.SIGALRM, handler)
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r, w = os.pipe()
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os.set_blocking(r, False)
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# Set wakeup_fd a read-only file descriptor to trigger the error
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signal.set_wakeup_fd(r)
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try:
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with captured_stderr() as err:
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_testcapi.raise_signal(signal.SIGALRM)
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except ZeroDivisionError:
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# An ignored exception should have been printed out on stderr
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err = err.getvalue()
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if ('Exception ignored when trying to write to the signal wakeup fd'
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not in err):
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raise AssertionError(err)
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if ('OSError: [Errno %d]' % errno.EBADF) not in err:
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raise AssertionError(err)
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else:
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raise AssertionError("ZeroDivisionError not raised")
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os.close(r)
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os.close(w)
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"""
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r, w = os.pipe()
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try:
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os.write(r, b'x')
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except OSError:
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pass
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else:
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self.skipTest("OS doesn't report write() error on the read end of a pipe")
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finally:
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os.close(r)
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os.close(w)
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assert_python_ok('-c', code)
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def test_wakeup_fd_early(self):
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self.check_wakeup("""def test():
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import select
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import time
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TIMEOUT_FULL = 10
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TIMEOUT_HALF = 5
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class InterruptSelect(Exception):
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pass
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def handler(signum, frame):
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raise InterruptSelect
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signal.signal(signal.SIGALRM, handler)
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signal.alarm(1)
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# We attempt to get a signal during the sleep,
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# before select is called
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try:
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select.select([], [], [], TIMEOUT_FULL)
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except InterruptSelect:
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pass
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else:
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raise Exception("select() was not interrupted")
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before_time = time.monotonic()
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select.select([read], [], [], TIMEOUT_FULL)
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after_time = time.monotonic()
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dt = after_time - before_time
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if dt >= TIMEOUT_HALF:
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raise Exception("%s >= %s" % (dt, TIMEOUT_HALF))
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""", signal.SIGALRM)
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def test_wakeup_fd_during(self):
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self.check_wakeup("""def test():
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import select
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import time
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TIMEOUT_FULL = 10
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TIMEOUT_HALF = 5
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class InterruptSelect(Exception):
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pass
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def handler(signum, frame):
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raise InterruptSelect
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signal.signal(signal.SIGALRM, handler)
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signal.alarm(1)
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before_time = time.monotonic()
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# We attempt to get a signal during the select call
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try:
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select.select([read], [], [], TIMEOUT_FULL)
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except InterruptSelect:
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pass
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else:
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raise Exception("select() was not interrupted")
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after_time = time.monotonic()
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dt = after_time - before_time
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if dt >= TIMEOUT_HALF:
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raise Exception("%s >= %s" % (dt, TIMEOUT_HALF))
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""", signal.SIGALRM)
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def test_signum(self):
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self.check_wakeup("""def test():
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import _testcapi
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signal.signal(signal.SIGUSR1, handler)
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_testcapi.raise_signal(signal.SIGUSR1)
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_testcapi.raise_signal(signal.SIGALRM)
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""", signal.SIGUSR1, signal.SIGALRM)
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@unittest.skipUnless(hasattr(signal, 'pthread_sigmask'),
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'need signal.pthread_sigmask()')
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def test_pending(self):
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self.check_wakeup("""def test():
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signum1 = signal.SIGUSR1
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signum2 = signal.SIGUSR2
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signal.signal(signum1, handler)
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signal.signal(signum2, handler)
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signal.pthread_sigmask(signal.SIG_BLOCK, (signum1, signum2))
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_testcapi.raise_signal(signum1)
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_testcapi.raise_signal(signum2)
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# Unblocking the 2 signals calls the C signal handler twice
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signal.pthread_sigmask(signal.SIG_UNBLOCK, (signum1, signum2))
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""", signal.SIGUSR1, signal.SIGUSR2, ordered=False)
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|
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@unittest.skipUnless(hasattr(socket, 'socketpair'), 'need socket.socketpair')
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class WakeupSocketSignalTests(unittest.TestCase):
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@unittest.skipIf(_testcapi is None, 'need _testcapi')
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def test_socket(self):
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# use a subprocess to have only one thread
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code = """if 1:
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import signal
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import socket
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import struct
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import _testcapi
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signum = signal.SIGINT
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signals = (signum,)
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def handler(signum, frame):
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pass
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signal.signal(signum, handler)
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read, write = socket.socketpair()
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write.setblocking(False)
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signal.set_wakeup_fd(write.fileno())
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_testcapi.raise_signal(signum)
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data = read.recv(1)
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if not data:
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raise Exception("no signum written")
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raised = struct.unpack('B', data)
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if raised != signals:
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raise Exception("%r != %r" % (raised, signals))
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read.close()
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write.close()
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"""
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assert_python_ok('-c', code)
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@unittest.skipIf(_testcapi is None, 'need _testcapi')
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def test_send_error(self):
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# Use a subprocess to have only one thread.
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if os.name == 'nt':
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action = 'send'
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else:
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action = 'write'
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code = """if 1:
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import errno
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import signal
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import socket
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import sys
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import time
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import _testcapi
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from test.support import captured_stderr
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|
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signum = signal.SIGINT
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|
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def handler(signum, frame):
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pass
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signal.signal(signum, handler)
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|
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read, write = socket.socketpair()
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read.setblocking(False)
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write.setblocking(False)
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signal.set_wakeup_fd(write.fileno())
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# Close sockets: send() will fail
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read.close()
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write.close()
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with captured_stderr() as err:
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_testcapi.raise_signal(signum)
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|
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err = err.getvalue()
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if ('Exception ignored when trying to {action} to the signal wakeup fd'
|
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not in err):
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raise AssertionError(err)
|
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""".format(action=action)
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assert_python_ok('-c', code)
|
|
|
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@unittest.skipIf(_testcapi is None, 'need _testcapi')
|
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def test_warn_on_full_buffer(self):
|
|
# Use a subprocess to have only one thread.
|
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if os.name == 'nt':
|
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action = 'send'
|
|
else:
|
|
action = 'write'
|
|
code = """if 1:
|
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import errno
|
|
import signal
|
|
import socket
|
|
import sys
|
|
import time
|
|
import _testcapi
|
|
from test.support import captured_stderr
|
|
|
|
signum = signal.SIGINT
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|
|
|
# This handler will be called, but we intentionally won't read from
|
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# the wakeup fd.
|
|
def handler(signum, frame):
|
|
pass
|
|
|
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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)
|
|
|
|
# Start with large chunk size to reduce the
|
|
# number of send needed to fill the buffer.
|
|
written = 0
|
|
for chunk_size in (2 ** 16, 2 ** 8, 1):
|
|
chunk = b"x" * chunk_size
|
|
try:
|
|
while True:
|
|
write.send(chunk)
|
|
written += chunk_size
|
|
except (BlockingIOError, socket.timeout):
|
|
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:
|
|
_testcapi.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
|
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signal.set_wakeup_fd(write.fileno(), warn_on_full_buffer=True)
|
|
|
|
with captured_stderr() as err:
|
|
_testcapi.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:
|
|
_testcapi.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:
|
|
_testcapi.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")
|
|
class SiginterruptTest(unittest.TestCase):
|
|
|
|
def readpipe_interrupted(self, interrupt):
|
|
"""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=5.0)
|
|
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)
|
|
|
|
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)
|
|
self.assertFalse(interrupted)
|
|
|
|
|
|
@unittest.skipIf(sys.platform == "win32", "Not valid on Windows")
|
|
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',),
|
|
'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)
|
|
|
|
start_time = time.monotonic()
|
|
while time.monotonic() - start_time < 60.0:
|
|
# use up some virtual time by doing real work
|
|
_ = pow(12345, 67890, 10000019)
|
|
if signal.getitimer(self.itimer) == (0.0, 0.0):
|
|
break # sig_vtalrm handler stopped this itimer
|
|
else: # Issue 8424
|
|
self.skipTest("timeout: likely cause: machine too slow or load too "
|
|
"high")
|
|
|
|
# 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)
|
|
|
|
start_time = time.monotonic()
|
|
while time.monotonic() - start_time < 60.0:
|
|
# do some work
|
|
_ = pow(12345, 67890, 10000019)
|
|
if signal.getitimer(self.itimer) == (0.0, 0.0):
|
|
break # sig_prof handler stopped this itimer
|
|
else: # Issue 8424
|
|
self.skipTest("timeout: likely cause: machine too slow or load too "
|
|
"high")
|
|
|
|
# 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()')
|
|
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()')
|
|
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, [])
|
|
|
|
@unittest.skipUnless(hasattr(signal, 'pthread_sigmask'),
|
|
'need signal.pthread_sigmask()')
|
|
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()')
|
|
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() + 15.0
|
|
|
|
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)
|
|
|
|
self.setsig(signal.SIGUSR1, handler)
|
|
self.setsig(signal.SIGALRM, handler) # for ITIMER_REAL
|
|
|
|
expected_sigs = 0
|
|
deadline = time.monotonic() + 15.0
|
|
|
|
while expected_sigs < N:
|
|
# Hopefully the SIGALRM will be received somewhere during
|
|
# initial processing of SIGUSR1.
|
|
signal.setitimer(signal.ITIMER_REAL, 1e-6 + random.random() * 1e-5)
|
|
os.kill(os.getpid(), signal.SIGUSR1)
|
|
|
|
expected_sigs += 2
|
|
# Wait for handlers to run to avoid signal coalescing
|
|
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")
|
|
|
|
|
|
def tearDownModule():
|
|
support.reap_children()
|
|
|
|
if __name__ == "__main__":
|
|
unittest.main()
|