| import unittest |
| from test import support |
| from contextlib import closing |
| import gc |
| import pickle |
| import select |
| import signal |
| import struct |
| import subprocess |
| import traceback |
| import sys, os, time, errno |
| from test.script_helper import assert_python_ok |
| try: |
| import threading |
| except ImportError: |
| threading = None |
| |
| if sys.platform in ('os2', 'riscos'): |
| raise unittest.SkipTest("Can't test signal on %s" % sys.platform) |
| |
| |
| class HandlerBCalled(Exception): |
| pass |
| |
| |
| def exit_subprocess(): |
| """Use os._exit(0) to exit the current subprocess. |
| |
| Otherwise, the test catches the SystemExit and continues executing |
| in parallel with the original test, so you wind up with an |
| exponential number of tests running concurrently. |
| """ |
| os._exit(0) |
| |
| |
| def ignoring_eintr(__func, *args, **kwargs): |
| try: |
| return __func(*args, **kwargs) |
| except EnvironmentError as e: |
| if e.errno != errno.EINTR: |
| raise |
| return None |
| |
| |
| @unittest.skipIf(sys.platform == "win32", "Not valid on Windows") |
| class InterProcessSignalTests(unittest.TestCase): |
| MAX_DURATION = 20 # Entire test should last at most 20 sec. |
| |
| def setUp(self): |
| self.using_gc = gc.isenabled() |
| gc.disable() |
| |
| def tearDown(self): |
| if self.using_gc: |
| gc.enable() |
| |
| def format_frame(self, frame, limit=None): |
| return ''.join(traceback.format_stack(frame, limit=limit)) |
| |
| def handlerA(self, signum, frame): |
| self.a_called = True |
| |
| def handlerB(self, signum, frame): |
| self.b_called = True |
| raise HandlerBCalled(signum, self.format_frame(frame)) |
| |
| def wait(self, child): |
| """Wait for child to finish, ignoring EINTR.""" |
| while True: |
| try: |
| child.wait() |
| return |
| except OSError as e: |
| if e.errno != errno.EINTR: |
| raise |
| |
| def run_test(self): |
| # Install handlers. This function runs in a sub-process, so we |
| # don't worry about re-setting the default handlers. |
| signal.signal(signal.SIGHUP, self.handlerA) |
| signal.signal(signal.SIGUSR1, self.handlerB) |
| signal.signal(signal.SIGUSR2, signal.SIG_IGN) |
| signal.signal(signal.SIGALRM, signal.default_int_handler) |
| |
| # Variables the signals will modify: |
| self.a_called = False |
| self.b_called = False |
| |
| # Let the sub-processes know who to send signals to. |
| pid = os.getpid() |
| |
| child = ignoring_eintr(subprocess.Popen, ['kill', '-HUP', str(pid)]) |
| if child: |
| self.wait(child) |
| if not self.a_called: |
| time.sleep(1) # Give the signal time to be delivered. |
| self.assertTrue(self.a_called) |
| self.assertFalse(self.b_called) |
| self.a_called = False |
| |
| # Make sure the signal isn't delivered while the previous |
| # Popen object is being destroyed, because __del__ swallows |
| # exceptions. |
| del child |
| try: |
| child = subprocess.Popen(['kill', '-USR1', str(pid)]) |
| # This wait should be interrupted by the signal's exception. |
| self.wait(child) |
| time.sleep(1) # Give the signal time to be delivered. |
| self.fail('HandlerBCalled exception not thrown') |
| except HandlerBCalled: |
| self.assertTrue(self.b_called) |
| self.assertFalse(self.a_called) |
| |
| child = ignoring_eintr(subprocess.Popen, ['kill', '-USR2', str(pid)]) |
| if child: |
| self.wait(child) # Nothing should happen. |
| |
| try: |
| signal.alarm(1) |
| # The race condition in pause doesn't matter in this case, |
| # since alarm is going to raise a KeyboardException, which |
| # will skip the call. |
| signal.pause() |
| # But if another signal arrives before the alarm, pause |
| # may return early. |
| time.sleep(1) |
| except KeyboardInterrupt: |
| pass |
| except: |
| self.fail("Some other exception woke us from pause: %s" % |
| traceback.format_exc()) |
| else: |
| self.fail("pause returned of its own accord, and the signal" |
| " didn't arrive after another second.") |
| |
| # Issue 3864, unknown if this affects earlier versions of freebsd also |
| @unittest.skipIf(sys.platform=='freebsd6', |
| 'inter process signals not reliable (do not mix well with threading) ' |
| 'on freebsd6') |
| def test_main(self): |
| # This function spawns a child process to insulate the main |
| # test-running process from all the signals. It then |
| # communicates with that child process over a pipe and |
| # re-raises information about any exceptions the child |
| # throws. The real work happens in self.run_test(). |
| os_done_r, os_done_w = os.pipe() |
| with closing(os.fdopen(os_done_r, 'rb')) as done_r, \ |
| closing(os.fdopen(os_done_w, 'wb')) as done_w: |
| child = os.fork() |
| if child == 0: |
| # In the child process; run the test and report results |
| # through the pipe. |
| try: |
| done_r.close() |
| # Have to close done_w again here because |
| # exit_subprocess() will skip the enclosing with block. |
| with closing(done_w): |
| try: |
| self.run_test() |
| except: |
| pickle.dump(traceback.format_exc(), done_w) |
| else: |
| pickle.dump(None, done_w) |
| except: |
| print('Uh oh, raised from pickle.') |
| traceback.print_exc() |
| finally: |
| exit_subprocess() |
| |
| done_w.close() |
| # Block for up to MAX_DURATION seconds for the test to finish. |
| r, w, x = select.select([done_r], [], [], self.MAX_DURATION) |
| if done_r in r: |
| tb = pickle.load(done_r) |
| if tb: |
| self.fail(tb) |
| else: |
| os.kill(child, signal.SIGKILL) |
| self.fail('Test deadlocked after %d seconds.' % |
| self.MAX_DURATION) |
| |
| |
| @unittest.skipIf(sys.platform == "win32", "Not valid on Windows") |
| class PosixTests(unittest.TestCase): |
| def trivial_signal_handler(self, *args): |
| pass |
| |
| def test_out_of_range_signal_number_raises_error(self): |
| self.assertRaises(ValueError, signal.getsignal, 4242) |
| |
| self.assertRaises(ValueError, signal.signal, 4242, |
| self.trivial_signal_handler) |
| |
| def test_setting_signal_handler_to_none_raises_error(self): |
| self.assertRaises(TypeError, signal.signal, |
| signal.SIGUSR1, None) |
| |
| def test_getsignal(self): |
| hup = signal.signal(signal.SIGHUP, self.trivial_signal_handler) |
| self.assertEqual(signal.getsignal(signal.SIGHUP), |
| self.trivial_signal_handler) |
| signal.signal(signal.SIGHUP, hup) |
| self.assertEqual(signal.getsignal(signal.SIGHUP), hup) |
| |
| |
| @unittest.skipUnless(sys.platform == "win32", "Windows specific") |
| class WindowsSignalTests(unittest.TestCase): |
| def test_issue9324(self): |
| # Updated for issue #10003, adding SIGBREAK |
| handler = lambda x, y: None |
| for sig in (signal.SIGABRT, signal.SIGBREAK, signal.SIGFPE, |
| signal.SIGILL, signal.SIGINT, signal.SIGSEGV, |
| signal.SIGTERM): |
| # Set and then reset a handler for signals that work on windows |
| signal.signal(sig, signal.signal(sig, handler)) |
| |
| with self.assertRaises(ValueError): |
| signal.signal(-1, handler) |
| |
| with self.assertRaises(ValueError): |
| signal.signal(7, handler) |
| |
| |
| @unittest.skipIf(sys.platform == "win32", "Not valid on Windows") |
| class WakeupSignalTests(unittest.TestCase): |
| TIMEOUT_FULL = 10 |
| TIMEOUT_HALF = 5 |
| |
| def handler(self, signum, frame): |
| pass |
| |
| def check_signum(self, *signals): |
| data = os.read(self.read, len(signals)+1) |
| raised = struct.unpack('%uB' % len(data), data) |
| # We don't care of the signal delivery order (it's not portable or |
| # reliable) |
| raised = set(raised) |
| signals = set(signals) |
| self.assertEqual(raised, signals) |
| |
| def test_wakeup_fd_early(self): |
| import select |
| |
| signal.alarm(1) |
| before_time = time.time() |
| # We attempt to get a signal during the sleep, |
| # before select is called |
| time.sleep(self.TIMEOUT_FULL) |
| mid_time = time.time() |
| self.assertTrue(mid_time - before_time < self.TIMEOUT_HALF) |
| select.select([self.read], [], [], self.TIMEOUT_FULL) |
| after_time = time.time() |
| self.assertTrue(after_time - mid_time < self.TIMEOUT_HALF) |
| self.check_signum(signal.SIGALRM) |
| |
| def test_wakeup_fd_during(self): |
| import select |
| |
| signal.alarm(1) |
| before_time = time.time() |
| # We attempt to get a signal during the select call |
| self.assertRaises(select.error, select.select, |
| [self.read], [], [], self.TIMEOUT_FULL) |
| after_time = time.time() |
| self.assertTrue(after_time - before_time < self.TIMEOUT_HALF) |
| self.check_signum(signal.SIGALRM) |
| |
| def test_signum(self): |
| old_handler = signal.signal(signal.SIGUSR1, self.handler) |
| self.addCleanup(signal.signal, signal.SIGUSR1, old_handler) |
| os.kill(os.getpid(), signal.SIGUSR1) |
| os.kill(os.getpid(), signal.SIGALRM) |
| self.check_signum(signal.SIGUSR1, signal.SIGALRM) |
| |
| @unittest.skipUnless(hasattr(signal, 'pthread_sigmask'), |
| 'need signal.pthread_sigmask()') |
| @unittest.skipUnless(hasattr(signal, 'pthread_kill'), |
| 'need signal.pthread_kill()') |
| def test_pending(self): |
| signum1 = signal.SIGUSR1 |
| signum2 = signal.SIGUSR2 |
| tid = threading.current_thread().ident |
| |
| old_handler = signal.signal(signum1, self.handler) |
| self.addCleanup(signal.signal, signum1, old_handler) |
| old_handler = signal.signal(signum2, self.handler) |
| self.addCleanup(signal.signal, signum2, old_handler) |
| |
| signal.pthread_sigmask(signal.SIG_BLOCK, (signum1, signum2)) |
| signal.pthread_kill(tid, signum1) |
| signal.pthread_kill(tid, signum2) |
| # Unblocking the 2 signals calls the C signal handler twice |
| signal.pthread_sigmask(signal.SIG_UNBLOCK, (signum1, signum2)) |
| |
| self.check_signum(signum1, signum2) |
| |
| def setUp(self): |
| import fcntl |
| |
| self.alrm = signal.signal(signal.SIGALRM, self.handler) |
| self.read, self.write = os.pipe() |
| flags = fcntl.fcntl(self.write, fcntl.F_GETFL, 0) |
| flags = flags | os.O_NONBLOCK |
| fcntl.fcntl(self.write, fcntl.F_SETFL, flags) |
| self.old_wakeup = signal.set_wakeup_fd(self.write) |
| |
| def tearDown(self): |
| signal.set_wakeup_fd(self.old_wakeup) |
| os.close(self.read) |
| os.close(self.write) |
| signal.signal(signal.SIGALRM, self.alrm) |
| |
| @unittest.skipIf(sys.platform == "win32", "Not valid on Windows") |
| class SiginterruptTest(unittest.TestCase): |
| |
| def setUp(self): |
| """Install a no-op signal handler that can be set to allow |
| interrupts or not, and arrange for the original signal handler to be |
| re-installed when the test is finished. |
| """ |
| self.signum = signal.SIGUSR1 |
| oldhandler = signal.signal(self.signum, lambda x,y: None) |
| self.addCleanup(signal.signal, self.signum, oldhandler) |
| |
| def readpipe_interrupted(self): |
| """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. |
| """ |
| # Create a pipe that can be used for the read. Also clean it up |
| # when the test is over, since nothing else will (but see below for |
| # the write end). |
| r, w = os.pipe() |
| self.addCleanup(os.close, r) |
| |
| # Create another process which can send a signal to this one to try |
| # to interrupt the read. |
| ppid = os.getpid() |
| pid = os.fork() |
| |
| if pid == 0: |
| # Child code: sleep to give the parent enough time to enter the |
| # read() call (there's a race here, but it's really tricky to |
| # eliminate it); then signal the parent process. Also, sleep |
| # again to make it likely that the signal is delivered to the |
| # parent process before the child exits. If the child exits |
| # first, the write end of the pipe will be closed and the test |
| # is invalid. |
| try: |
| time.sleep(0.2) |
| os.kill(ppid, self.signum) |
| time.sleep(0.2) |
| finally: |
| # No matter what, just exit as fast as possible now. |
| exit_subprocess() |
| else: |
| # Parent code. |
| # Make sure the child is eventually reaped, else it'll be a |
| # zombie for the rest of the test suite run. |
| self.addCleanup(os.waitpid, pid, 0) |
| |
| # Close the write end of the pipe. The child has a copy, so |
| # it's not really closed until the child exits. We need it to |
| # close when the child exits so that in the non-interrupt case |
| # the read eventually completes, otherwise we could just close |
| # it *after* the test. |
| os.close(w) |
| |
| # Try the read and report whether it is interrupted or not to |
| # the caller. |
| try: |
| d = os.read(r, 1) |
| return False |
| except OSError as err: |
| if err.errno != errno.EINTR: |
| raise |
| return True |
| |
| 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. |
| i = self.readpipe_interrupted() |
| self.assertTrue(i) |
| # Arrival of the signal shouldn't have changed anything. |
| i = self.readpipe_interrupted() |
| self.assertTrue(i) |
| |
| 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. |
| signal.siginterrupt(self.signum, 1) |
| i = self.readpipe_interrupted() |
| self.assertTrue(i) |
| # Arrival of the signal shouldn't have changed anything. |
| i = self.readpipe_interrupted() |
| self.assertTrue(i) |
| |
| 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. |
| signal.siginterrupt(self.signum, 0) |
| i = self.readpipe_interrupted() |
| self.assertFalse(i) |
| # Arrival of the signal shouldn't have changed anything. |
| i = self.readpipe_interrupted() |
| self.assertFalse(i) |
| |
| |
| @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 ('freebsd6', '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.time() |
| while time.time() - 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) |
| |
| # Issue 3864, unknown if this affects earlier versions of freebsd also |
| @unittest.skipIf(sys.platform=='freebsd6', |
| '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.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, 'sigwait'), |
| 'need signal.sigwait()') |
| @unittest.skipUnless(hasattr(signal, 'pthread_sigmask'), |
| 'need signal.pthread_sigmask()') |
| @unittest.skipUnless(hasattr(os, 'fork'), 'need os.fork()') |
| def test_sigwait(self): |
| def test(signum): |
| signal.alarm(1) |
| received = signal.sigwait([signum]) |
| if received != signum: |
| print("sigwait() received %s, not %s" |
| % (received, signum), |
| file=sys.stderr) |
| os._exit(1) |
| |
| signum = signal.SIGALRM |
| |
| # sigwait 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, self.handler) |
| signal.pthread_sigmask(signal.SIG_BLOCK, [signum]) |
| |
| # Do the tests |
| test(signum) |
| |
| # The handler must not be called on unblock |
| try: |
| signal.pthread_sigmask(signal.SIG_UNBLOCK, [signum]) |
| 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) |
| 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()') |
| @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() |