mirror of https://github.com/python/cpython
823 lines
31 KiB
Python
823 lines
31 KiB
Python
import unittest
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from test import support
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from contextlib import closing
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import gc
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import pickle
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import select
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import signal
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import struct
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import subprocess
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import traceback
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import sys, os, time, errno
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from test.script_helper import assert_python_ok, spawn_python
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try:
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import threading
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except ImportError:
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threading = None
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if sys.platform in ('os2', 'riscos'):
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raise unittest.SkipTest("Can't test signal on %s" % sys.platform)
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class HandlerBCalled(Exception):
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pass
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def exit_subprocess():
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"""Use os._exit(0) to exit the current subprocess.
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Otherwise, the test catches the SystemExit and continues executing
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in parallel with the original test, so you wind up with an
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exponential number of tests running concurrently.
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"""
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os._exit(0)
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def ignoring_eintr(__func, *args, **kwargs):
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try:
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return __func(*args, **kwargs)
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except EnvironmentError as e:
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if e.errno != errno.EINTR:
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raise
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return None
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@unittest.skipIf(sys.platform == "win32", "Not valid on Windows")
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class InterProcessSignalTests(unittest.TestCase):
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MAX_DURATION = 20 # Entire test should last at most 20 sec.
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def setUp(self):
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self.using_gc = gc.isenabled()
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gc.disable()
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def tearDown(self):
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if self.using_gc:
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gc.enable()
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def format_frame(self, frame, limit=None):
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return ''.join(traceback.format_stack(frame, limit=limit))
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def handlerA(self, signum, frame):
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self.a_called = True
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def handlerB(self, signum, frame):
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self.b_called = True
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raise HandlerBCalled(signum, self.format_frame(frame))
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def wait(self, child):
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"""Wait for child to finish, ignoring EINTR."""
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while True:
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try:
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child.wait()
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return
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except OSError as e:
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if e.errno != errno.EINTR:
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raise
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def run_test(self):
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# Install handlers. This function runs in a sub-process, so we
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# don't worry about re-setting the default handlers.
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signal.signal(signal.SIGHUP, self.handlerA)
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signal.signal(signal.SIGUSR1, self.handlerB)
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signal.signal(signal.SIGUSR2, signal.SIG_IGN)
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signal.signal(signal.SIGALRM, signal.default_int_handler)
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# Variables the signals will modify:
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self.a_called = False
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self.b_called = False
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# Let the sub-processes know who to send signals to.
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pid = os.getpid()
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child = ignoring_eintr(subprocess.Popen, ['kill', '-HUP', str(pid)])
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if child:
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self.wait(child)
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if not self.a_called:
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time.sleep(1) # Give the signal time to be delivered.
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self.assertTrue(self.a_called)
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self.assertFalse(self.b_called)
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self.a_called = False
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# Make sure the signal isn't delivered while the previous
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# Popen object is being destroyed, because __del__ swallows
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# exceptions.
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del child
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try:
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child = subprocess.Popen(['kill', '-USR1', str(pid)])
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# This wait should be interrupted by the signal's exception.
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self.wait(child)
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time.sleep(1) # Give the signal time to be delivered.
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self.fail('HandlerBCalled exception not thrown')
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except HandlerBCalled:
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self.assertTrue(self.b_called)
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self.assertFalse(self.a_called)
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child = ignoring_eintr(subprocess.Popen, ['kill', '-USR2', str(pid)])
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if child:
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self.wait(child) # Nothing should happen.
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try:
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signal.alarm(1)
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# The race condition in pause doesn't matter in this case,
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# since alarm is going to raise a KeyboardException, which
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# will skip the call.
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signal.pause()
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# But if another signal arrives before the alarm, pause
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# may return early.
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time.sleep(1)
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except KeyboardInterrupt:
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pass
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except:
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self.fail("Some other exception woke us from pause: %s" %
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traceback.format_exc())
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else:
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self.fail("pause returned of its own accord, and the signal"
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" didn't arrive after another second.")
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# Issue 3864, unknown if this affects earlier versions of freebsd also
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@unittest.skipIf(sys.platform=='freebsd6',
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'inter process signals not reliable (do not mix well with threading) '
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'on freebsd6')
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def test_main(self):
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# This function spawns a child process to insulate the main
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# test-running process from all the signals. It then
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# communicates with that child process over a pipe and
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# re-raises information about any exceptions the child
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# throws. The real work happens in self.run_test().
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os_done_r, os_done_w = os.pipe()
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with closing(os.fdopen(os_done_r, 'rb')) as done_r, \
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closing(os.fdopen(os_done_w, 'wb')) as done_w:
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child = os.fork()
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if child == 0:
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# In the child process; run the test and report results
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# through the pipe.
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try:
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done_r.close()
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# Have to close done_w again here because
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# exit_subprocess() will skip the enclosing with block.
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with closing(done_w):
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try:
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self.run_test()
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except:
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pickle.dump(traceback.format_exc(), done_w)
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else:
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pickle.dump(None, done_w)
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except:
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print('Uh oh, raised from pickle.')
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traceback.print_exc()
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finally:
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exit_subprocess()
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done_w.close()
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# Block for up to MAX_DURATION seconds for the test to finish.
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r, w, x = select.select([done_r], [], [], self.MAX_DURATION)
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if done_r in r:
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tb = pickle.load(done_r)
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if tb:
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self.fail(tb)
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else:
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os.kill(child, signal.SIGKILL)
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self.fail('Test deadlocked after %d seconds.' %
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self.MAX_DURATION)
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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.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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@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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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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signal.signal(sig, signal.signal(sig, handler))
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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.skipIf(sys.platform == "win32", "Not valid on Windows")
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class WakeupSignalTests(unittest.TestCase):
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TIMEOUT_FULL = 10
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TIMEOUT_HALF = 5
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def handler(self, signum, frame):
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pass
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def check_signum(self, *signals):
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data = os.read(self.read, len(signals)+1)
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raised = struct.unpack('%uB' % len(data), data)
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# We don't care of the signal delivery order (it's not portable or
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# reliable)
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raised = set(raised)
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signals = set(signals)
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self.assertEqual(raised, signals)
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def test_wakeup_fd_early(self):
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import select
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signal.alarm(1)
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before_time = time.time()
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# We attempt to get a signal during the sleep,
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# before select is called
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time.sleep(self.TIMEOUT_FULL)
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mid_time = time.time()
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self.assertTrue(mid_time - before_time < self.TIMEOUT_HALF)
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select.select([self.read], [], [], self.TIMEOUT_FULL)
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after_time = time.time()
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self.assertTrue(after_time - mid_time < self.TIMEOUT_HALF)
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self.check_signum(signal.SIGALRM)
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def test_wakeup_fd_during(self):
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import select
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signal.alarm(1)
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before_time = time.time()
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# We attempt to get a signal during the select call
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self.assertRaises(select.error, select.select,
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[self.read], [], [], self.TIMEOUT_FULL)
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after_time = time.time()
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self.assertTrue(after_time - before_time < self.TIMEOUT_HALF)
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self.check_signum(signal.SIGALRM)
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def test_signum(self):
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old_handler = signal.signal(signal.SIGUSR1, self.handler)
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self.addCleanup(signal.signal, signal.SIGUSR1, old_handler)
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os.kill(os.getpid(), signal.SIGUSR1)
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os.kill(os.getpid(), signal.SIGALRM)
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self.check_signum(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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@unittest.skipUnless(hasattr(signal, 'pthread_kill'),
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'need signal.pthread_kill()')
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def test_pending(self):
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signum1 = signal.SIGUSR1
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signum2 = signal.SIGUSR2
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tid = threading.current_thread().ident
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old_handler = signal.signal(signum1, self.handler)
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self.addCleanup(signal.signal, signum1, old_handler)
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old_handler = signal.signal(signum2, self.handler)
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self.addCleanup(signal.signal, signum2, old_handler)
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signal.pthread_sigmask(signal.SIG_BLOCK, (signum1, signum2))
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signal.pthread_kill(tid, signum1)
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signal.pthread_kill(tid, 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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self.check_signum(signum1, signum2)
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@unittest.skipUnless(hasattr(signal, 'pthread_kill'),
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'need signal.pthread_kill()')
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def test_pthread_kill_main_thread(self):
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# Test that a signal can be sent to the main thread with pthread_kill()
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# before any other thread has been created (see issue #12392).
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code = """if True:
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import threading
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import signal
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import sys
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def handler(signum, frame):
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sys.exit(3)
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signal.signal(signal.SIGUSR1, handler)
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signal.pthread_kill(threading.get_ident(), signal.SIGUSR1)
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sys.exit(1)
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"""
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with spawn_python('-c', code) as process:
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stdout, stderr = process.communicate()
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exitcode = process.wait()
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if exitcode != 3:
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raise Exception("Child error (exit code %s): %s" %
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(exitcode, stdout))
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def setUp(self):
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import fcntl
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self.alrm = signal.signal(signal.SIGALRM, self.handler)
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self.read, self.write = os.pipe()
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flags = fcntl.fcntl(self.write, fcntl.F_GETFL, 0)
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flags = flags | os.O_NONBLOCK
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fcntl.fcntl(self.write, fcntl.F_SETFL, flags)
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self.old_wakeup = signal.set_wakeup_fd(self.write)
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def tearDown(self):
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signal.set_wakeup_fd(self.old_wakeup)
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os.close(self.read)
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os.close(self.write)
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signal.signal(signal.SIGALRM, self.alrm)
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@unittest.skipIf(sys.platform == "win32", "Not valid on Windows")
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class SiginterruptTest(unittest.TestCase):
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def readpipe_interrupted(self, interrupt):
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"""Perform a read during which a signal will arrive. Return True if the
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read is interrupted by the signal and raises an exception. Return False
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if it returns normally.
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"""
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# use a subprocess to have only one thread, to have a timeout on the
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# blocking read and to not touch signal handling in this process
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code = """if 1:
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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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interrupt = %r
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r, w = os.pipe()
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def handler(signum, frame):
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pass
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print("ready")
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sys.stdout.flush()
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signal.signal(signal.SIGALRM, handler)
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if interrupt is not None:
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signal.siginterrupt(signal.SIGALRM, interrupt)
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# run the test twice
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for loop in range(2):
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# send a SIGALRM in a second (during the read)
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signal.alarm(1)
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try:
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# blocking call: read from a pipe without data
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os.read(r, 1)
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except OSError as err:
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if err.errno != errno.EINTR:
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raise
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else:
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sys.exit(2)
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sys.exit(3)
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""" % (interrupt,)
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with spawn_python('-c', code) as process:
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try:
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# wait until the child process is loaded and has started
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first_line = process.stdout.readline()
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stdout, stderr = process.communicate(timeout=3.0)
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except subprocess.TimeoutExpired:
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process.kill()
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return False
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else:
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stdout = first_line + stdout
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exitcode = process.wait()
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if exitcode not in (2, 3):
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raise Exception("Child error (exit code %s): %s"
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% (exitcode, stdout))
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return (exitcode == 3)
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def test_without_siginterrupt(self):
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# If a signal handler is installed and siginterrupt is not called
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# at all, when that signal arrives, it interrupts a syscall that's in
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# progress.
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interrupted = self.readpipe_interrupted(None)
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self.assertTrue(interrupted)
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def test_siginterrupt_on(self):
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# If a signal handler is installed and siginterrupt is called with
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# a true value for the second argument, when that signal arrives, it
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# interrupts a syscall that's in progress.
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interrupted = self.readpipe_interrupted(True)
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self.assertTrue(interrupted)
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def test_siginterrupt_off(self):
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# If a signal handler is installed and siginterrupt is called with
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# a false value for the second argument, when that signal arrives, it
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# does not interrupt a syscall that's in progress.
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interrupted = self.readpipe_interrupted(False)
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self.assertFalse(interrupted)
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@unittest.skipIf(sys.platform == "win32", "Not valid on Windows")
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class ItimerTest(unittest.TestCase):
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def setUp(self):
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self.hndl_called = False
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self.hndl_count = 0
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self.itimer = None
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self.old_alarm = signal.signal(signal.SIGALRM, self.sig_alrm)
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def tearDown(self):
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signal.signal(signal.SIGALRM, self.old_alarm)
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if self.itimer is not None: # test_itimer_exc doesn't change this attr
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# just ensure that itimer is stopped
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signal.setitimer(self.itimer, 0)
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def sig_alrm(self, *args):
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self.hndl_called = True
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def sig_vtalrm(self, *args):
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self.hndl_called = True
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if self.hndl_count > 3:
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# it shouldn't be here, because it should have been disabled.
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raise signal.ItimerError("setitimer didn't disable ITIMER_VIRTUAL "
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"timer.")
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elif self.hndl_count == 3:
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# disable ITIMER_VIRTUAL, this function shouldn't be called anymore
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signal.setitimer(signal.ITIMER_VIRTUAL, 0)
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self.hndl_count += 1
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def sig_prof(self, *args):
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self.hndl_called = True
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signal.setitimer(signal.ITIMER_PROF, 0)
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def test_itimer_exc(self):
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# XXX I'm assuming -1 is an invalid itimer, but maybe some platform
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# defines it ?
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self.assertRaises(signal.ItimerError, signal.setitimer, -1, 0)
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# Negative times are treated as zero on some platforms.
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if 0:
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self.assertRaises(signal.ItimerError,
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signal.setitimer, signal.ITIMER_REAL, -1)
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def test_itimer_real(self):
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self.itimer = signal.ITIMER_REAL
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signal.setitimer(self.itimer, 1.0)
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signal.pause()
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self.assertEqual(self.hndl_called, True)
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|
|
# Issue 3864, unknown if this affects earlier versions of freebsd also
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@unittest.skipIf(sys.platform in ('freebsd6', 'netbsd5'),
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'itimer not reliable (does not mix well with threading) on some BSDs.')
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def test_itimer_virtual(self):
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self.itimer = signal.ITIMER_VIRTUAL
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signal.signal(signal.SIGVTALRM, self.sig_vtalrm)
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signal.setitimer(self.itimer, 0.3, 0.2)
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start_time = time.time()
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while time.time() - start_time < 60.0:
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# use up some virtual time by doing real work
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_ = pow(12345, 67890, 10000019)
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if signal.getitimer(self.itimer) == (0.0, 0.0):
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break # sig_vtalrm handler stopped this itimer
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else: # Issue 8424
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self.skipTest("timeout: likely cause: machine too slow or load too "
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"high")
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# virtual itimer should be (0.0, 0.0) now
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self.assertEqual(signal.getitimer(self.itimer), (0.0, 0.0))
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# and the handler should have been called
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self.assertEqual(self.hndl_called, True)
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|
|
# Issue 3864, unknown if this affects earlier versions of freebsd also
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|
@unittest.skipIf(sys.platform=='freebsd6',
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'itimer not reliable (does not mix well with threading) on freebsd6')
|
|
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.time()
|
|
while time.time() - 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)
|
|
|
|
|
|
class PendingSignalsTests(unittest.TestCase):
|
|
"""
|
|
Test pthread_sigmask(), pthread_kill(), sigpending() and sigwait()
|
|
functions.
|
|
"""
|
|
def setUp(self):
|
|
self.hndl_called = False
|
|
self.has_pthread_kill = hasattr(signal, 'pthread_kill')
|
|
|
|
def handler(self, signum, frame):
|
|
1/0
|
|
|
|
def read_sigmask(self):
|
|
return signal.pthread_sigmask(signal.SIG_BLOCK, [])
|
|
|
|
def can_test_blocked_signals(self, skip):
|
|
"""
|
|
Check if a blocked signal can be raised to the main thread without
|
|
calling its signal handler. We need pthread_kill() or exactly one
|
|
thread (the main thread).
|
|
|
|
Return True if it's possible. Otherwise, return False and print a
|
|
warning if skip is False, or raise a SkipTest exception if skip is
|
|
True.
|
|
"""
|
|
if self.has_pthread_kill:
|
|
return True
|
|
|
|
# The fault handler timeout thread masks all signals. If the main
|
|
# thread masks also SIGUSR1, all threads mask this signal. In this
|
|
# case, if we send SIGUSR1 to the process, the signal is pending in the
|
|
# main or the faulthandler timeout thread. Unblock SIGUSR1 in the main
|
|
# thread calls the signal handler only if the signal is pending for the
|
|
# main thread. Stop the faulthandler timeout thread to workaround this
|
|
# problem.
|
|
import faulthandler
|
|
faulthandler.cancel_dump_tracebacks_later()
|
|
|
|
# Issue #11998: The _tkinter module loads the Tcl library which
|
|
# creates a thread waiting events in select(). This thread receives
|
|
# signals blocked by all other threads. We cannot test blocked
|
|
# signals
|
|
if '_tkinter' in sys.modules:
|
|
message = ("_tkinter is loaded and pthread_kill() is missing, "
|
|
"cannot test blocked signals (issue #11998)")
|
|
if skip:
|
|
self.skipTest(message)
|
|
else:
|
|
print("WARNING: %s" % message)
|
|
return False
|
|
return True
|
|
|
|
def kill(self, signum):
|
|
if self.has_pthread_kill:
|
|
tid = threading.get_ident()
|
|
signal.pthread_kill(tid, signum)
|
|
else:
|
|
pid = os.getpid()
|
|
os.kill(pid, signum)
|
|
|
|
@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):
|
|
self.can_test_blocked_signals(True)
|
|
|
|
signum = signal.SIGUSR1
|
|
old_handler = signal.signal(signum, self.handler)
|
|
self.addCleanup(signal.signal, signum, old_handler)
|
|
|
|
signal.pthread_sigmask(signal.SIG_BLOCK, [signum])
|
|
self.kill(signum)
|
|
self.assertEqual(signal.sigpending(), {signum})
|
|
with self.assertRaises(ZeroDivisionError):
|
|
signal.pthread_sigmask(signal.SIG_UNBLOCK, [signum])
|
|
|
|
@unittest.skipUnless(hasattr(signal, 'pthread_kill'),
|
|
'need signal.pthread_kill()')
|
|
def test_pthread_kill(self):
|
|
signum = signal.SIGUSR1
|
|
current = threading.get_ident()
|
|
|
|
old_handler = signal.signal(signum, self.handler)
|
|
self.addCleanup(signal.signal, signum, old_handler)
|
|
|
|
with self.assertRaises(ZeroDivisionError):
|
|
signal.pthread_kill(current, signum)
|
|
|
|
@unittest.skipUnless(hasattr(signal, 'pthread_sigmask'),
|
|
'need signal.pthread_sigmask()')
|
|
@unittest.skipUnless(hasattr(os, 'fork'), 'need os.fork()')
|
|
def wait_helper(self, test, handler, blocked):
|
|
signum = signal.SIGALRM
|
|
|
|
# sig*wait* must be called with the signal blocked: since the current
|
|
# process might have several threads running, we fork() a child process
|
|
# to have a single thread.
|
|
pid = os.fork()
|
|
if pid == 0:
|
|
# 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)
|
|
os._exit(1)
|
|
except BaseException as err:
|
|
print("error: {}".format(err), file=sys.stderr)
|
|
sys.stderr.flush()
|
|
os._exit(1)
|
|
else:
|
|
os._exit(0)
|
|
else:
|
|
# parent: check that the child correcty received the signal
|
|
self.assertEqual(os.waitpid(pid, 0), (pid, 0))
|
|
|
|
@unittest.skipUnless(hasattr(signal, 'sigwait'),
|
|
'need signal.sigwait()')
|
|
def test_sigwait(self):
|
|
def test(signum):
|
|
signal.alarm(1)
|
|
self.assertEqual(signum, signal.sigwait([signum]))
|
|
|
|
self.wait_helper(test, self.handler, signal.SIGALRM)
|
|
|
|
@unittest.skipUnless(hasattr(signal, 'sigwaitinfo'),
|
|
'need signal.sigwaitinfo()')
|
|
def test_sigwaitinfo(self):
|
|
def test(signum):
|
|
signal.alarm(1)
|
|
info = signal.sigwaitinfo([signum])
|
|
self.assertEqual(signum, info.si_signo)
|
|
|
|
self.wait_helper(test, self.handler, signal.SIGALRM)
|
|
|
|
@unittest.skipUnless(hasattr(signal, 'sigtimedwait'),
|
|
'need signal.sigtimedwait()')
|
|
def test_sigtimedwait(self):
|
|
def test(signum):
|
|
signal.alarm(1)
|
|
info = signal.sigtimedwait([signum], (10, 1000))
|
|
self.assertEqual(signum, info.si_signo)
|
|
|
|
self.wait_helper(test, self.handler, signal.SIGALRM)
|
|
|
|
# check that polling with sigtimedwait works
|
|
@unittest.skipUnless(hasattr(signal, 'sigtimedwait'),
|
|
'need signal.sigtimedwait()')
|
|
def test_sigtimedwait_poll(self):
|
|
def test(signum):
|
|
self.kill(signum)
|
|
info = signal.sigtimedwait([signum], (0, 0))
|
|
self.assertEqual(signum, info.si_signo)
|
|
|
|
self.wait_helper(test, self.handler, signal.SIGALRM)
|
|
|
|
@unittest.skipUnless(hasattr(signal, 'sigtimedwait'),
|
|
'need signal.sigtimedwait()')
|
|
def test_sigtimedwait_timeout(self):
|
|
def test(signum):
|
|
self.assertEqual(None, signal.sigtimedwait([signum], (1, 35500)))
|
|
|
|
self.wait_helper(test, self.handler, signal.SIGALRM)
|
|
|
|
@unittest.skipUnless(hasattr(signal, 'sigtimedwait'),
|
|
'need signal.sigtimedwait()')
|
|
def test_sigtimedwait_negative_timeout(self):
|
|
signum = signal.SIGALRM
|
|
self.assertRaises(ValueError, signal.sigtimedwait, [signum], (-1, -1))
|
|
self.assertRaises(ValueError, signal.sigtimedwait, [signum], (0, -1))
|
|
self.assertRaises(ValueError, signal.sigtimedwait, [signum], (-1, 0))
|
|
|
|
def alarm_handler(self, signum, frame):
|
|
self.hndl_called = True
|
|
|
|
@unittest.skipUnless(hasattr(signal, 'sigwaitinfo'),
|
|
'need signal.sigwaitinfo()')
|
|
def test_sigwaitinfo_interrupted(self):
|
|
def test(signum):
|
|
signal.alarm(1)
|
|
try:
|
|
signal.sigwaitinfo([signal.SIGUSR1])
|
|
except OSError as e:
|
|
if e.errno == errno.EINTR:
|
|
self.assertTrue(self.hndl_called)
|
|
else:
|
|
self.fail("Expected EINTR to be raised by sigwaitinfo")
|
|
else:
|
|
self.fail("Expected EINTR to be raised by sigwaitinfo")
|
|
|
|
self.wait_helper(test, self.alarm_handler, signal.SIGUSR1)
|
|
|
|
@unittest.skipUnless(hasattr(signal, 'sigwait'),
|
|
'need signal.sigwait()')
|
|
@unittest.skipUnless(hasattr(signal, 'pthread_sigmask'),
|
|
'need signal.pthread_sigmask()')
|
|
@unittest.skipIf(threading is None, "test needs threading module")
|
|
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):
|
|
test_blocked_signals = self.can_test_blocked_signals(False)
|
|
signum = signal.SIGUSR1
|
|
|
|
# Install our signal handler
|
|
old_handler = signal.signal(signum, self.handler)
|
|
self.addCleanup(signal.signal, signum, old_handler)
|
|
|
|
# Unblock SIGUSR1 (and copy the old mask) to test our signal handler
|
|
old_mask = signal.pthread_sigmask(signal.SIG_UNBLOCK, [signum])
|
|
self.addCleanup(signal.pthread_sigmask, signal.SIG_SETMASK, old_mask)
|
|
with self.assertRaises(ZeroDivisionError):
|
|
self.kill(signum)
|
|
|
|
# Block and then raise SIGUSR1. The signal is blocked: the signal
|
|
# handler is not called, and the signal is now pending
|
|
signal.pthread_sigmask(signal.SIG_BLOCK, [signum])
|
|
if test_blocked_signals:
|
|
self.kill(signum)
|
|
|
|
# Check the new mask
|
|
blocked = self.read_sigmask()
|
|
self.assertIn(signum, blocked)
|
|
self.assertEqual(old_mask ^ blocked, {signum})
|
|
|
|
# Unblock SIGUSR1
|
|
if test_blocked_signals:
|
|
with self.assertRaises(ZeroDivisionError):
|
|
# unblock the pending signal calls immediatly the signal handler
|
|
signal.pthread_sigmask(signal.SIG_UNBLOCK, [signum])
|
|
else:
|
|
signal.pthread_sigmask(signal.SIG_UNBLOCK, [signum])
|
|
with self.assertRaises(ZeroDivisionError):
|
|
self.kill(signum)
|
|
|
|
# Check the new mask
|
|
unblocked = self.read_sigmask()
|
|
self.assertNotIn(signum, unblocked)
|
|
self.assertEqual(blocked ^ unblocked, {signum})
|
|
self.assertSequenceEqual(old_mask, unblocked)
|
|
# Finally, restore the previous signal handler and the signal mask
|
|
|
|
|
|
def test_main():
|
|
try:
|
|
support.run_unittest(PosixTests, InterProcessSignalTests,
|
|
WakeupSignalTests, SiginterruptTest,
|
|
ItimerTest, WindowsSignalTests,
|
|
PendingSignalsTests)
|
|
finally:
|
|
support.reap_children()
|
|
|
|
|
|
if __name__ == "__main__":
|
|
test_main()
|