Python faulthandler._sigsegv() Examples

def _wait_and_crash(cls):
        _executor_mixin._test_event.wait()
        faulthandler._sigsegv() 

def _crash(delay=None):
    """Induces a segfault."""
    if delay:
        time.sleep(delay)
    import faulthandler
    faulthandler.disable()
    faulthandler._sigsegv() 

def test_disable(self):
        code = """
            import faulthandler
            faulthandler.enable()
            faulthandler.disable()
            faulthandler._sigsegv()
            """
        not_expected = 'Fatal Python error'
        stderr, exitcode = self.get_output(code)
        stderr = '\n'.join(stderr)
        self.assertTrue(not_expected not in stderr,
                     "%r is present in %r" % (not_expected, stderr))
        self.assertNotEqual(exitcode, 0) 

def test_enable_single_thread(self):
        self.check_fatal_error("""
            import faulthandler
            faulthandler.enable(all_threads=False)
            faulthandler._sigsegv()
            """,
            3,
            'Segmentation fault',
            all_threads=False) 

def test_enable_file(self):
        with temporary_filename() as filename:
            self.check_fatal_error("""
                import faulthandler
                output = open({filename}, 'wb')
                faulthandler.enable(output)
                faulthandler._sigsegv()
                """.format(filename=repr(filename)),
                4,
                'Segmentation fault',
                filename=filename) 

def test_gil_released(self):
        self.check_fatal_error("""
            import faulthandler
            faulthandler.enable()
            faulthandler._sigsegv(True)
            """,
            3,
            'Segmentation fault') 

def test_sigsegv(self):
        self.check_fatal_error("""
            import faulthandler
            faulthandler.enable()
            faulthandler._sigsegv()
            """,
            3,
            'Segmentation fault') 

def test_child_terminated_in_stopped_state(self):
        """Test wait() behavior when waitpid returns WIFSTOPPED; issue29335."""
        PTRACE_TRACEME = 0  # From glibc and MacOS (PT_TRACE_ME).
        libc_name = ctypes.util.find_library('c')
        libc = ctypes.CDLL(libc_name)
        if not hasattr(libc, 'ptrace'):
            raise unittest.SkipTest('ptrace() required')

        code = textwrap.dedent("""
             import ctypes
             import faulthandler
             from test.support import SuppressCrashReport

             libc = ctypes.CDLL({libc_name!r})
             libc.ptrace({PTRACE_TRACEME}, 0, 0)
        """.format(libc_name=libc_name, PTRACE_TRACEME=PTRACE_TRACEME))

        child = subprocess.Popen([sys.executable, '-c', code])
        if child.wait() != 0:
            raise unittest.SkipTest('ptrace() failed - unable to test')

        code += textwrap.dedent("""
             with SuppressCrashReport():
                # Crash the process
                faulthandler._sigsegv()
        """)
        child = subprocess.Popen([sys.executable, '-c', code])
        try:
            returncode = child.wait()
        except:
            child.kill()  # Clean up the hung stopped process.
            raise
        self.assertNotEqual(0, returncode)
        self.assertLess(returncode, 0)  # signal death, likely SIGSEGV. 

def test_crashed(self):
        # Any code which causes a crash
        code = 'import faulthandler; faulthandler._sigsegv()'
        crash_test = self.create_test(name="crash", code=code)
        ok_test = self.create_test(name="ok")

        tests = [crash_test, ok_test]
        output = self.run_tests("-j2", *tests, exitcode=2)
        self.check_executed_tests(output, tests, failed=crash_test,
                                  randomize=True) 

def crash():
    """Induces a segfault"""
    import faulthandler
    faulthandler._sigsegv() 

def test_sigsegv(self):
        self.check_fatal_error("""
            import faulthandler
            faulthandler.enable()
            faulthandler._sigsegv()
            """,
            3,
            'Segmentation fault') 

def test_disable(self):
        code = """
            import faulthandler
            faulthandler.enable()
            faulthandler.disable()
            faulthandler._sigsegv()
            """
        not_expected = 'Fatal Python error'
        stderr, exitcode = self.get_output(code)
        stderr = '\n'.join(stderr)
        self.assertTrue(not_expected not in stderr,
                     "%r is present in %r" % (not_expected, stderr))
        self.assertNotEqual(exitcode, 0) 

def test_enable_single_thread(self):
        self.check_fatal_error("""
            import faulthandler
            faulthandler.enable(all_threads=False)
            faulthandler._sigsegv()
            """,
            3,
            'Segmentation fault',
            all_threads=False) 

def test_enable_file(self):
        with temporary_filename() as filename:
            self.check_fatal_error("""
                import faulthandler
                output = open({filename}, 'wb')
                faulthandler.enable(output)
                faulthandler._sigsegv()
                """.format(filename=repr(filename)),
                4,
                'Segmentation fault',
                filename=filename) 

def test_gil_released(self):
        self.check_fatal_error("""
            import faulthandler
            faulthandler.enable()
            faulthandler._sigsegv(True)
            """,
            3,
            'Segmentation fault') 

def test_sigsegv(self):
        self.check_fatal_error("""
            import faulthandler
            faulthandler.enable()
            faulthandler._sigsegv()
            """,
            3,
            'Segmentation fault') 

def test_enable_single_thread(self):
        self.check_fatal_error("""
            import faulthandler
            faulthandler.enable(all_threads=False)
            faulthandler._sigsegv()
            """,
            3,
            'Segmentation fault',
            all_threads=False) 

def test_enable_fd(self):
        with tempfile.TemporaryFile('wb+') as fp:
            fd = fp.fileno()
            self.check_fatal_error("""
                import faulthandler
                import sys
                faulthandler.enable(%s)
                faulthandler._sigsegv()
                """ % fd,
                4,
                'Segmentation fault',
                fd=fd) 

def test_enable_file(self):
        with temporary_filename() as filename:
            self.check_fatal_error("""
                import faulthandler
                output = open({filename}, 'wb')
                faulthandler.enable(output)
                faulthandler._sigsegv()
                """.format(filename=repr(filename)),
                4,
                'Segmentation fault',
                filename=filename) 

def test_gil_released(self):
        self.check_fatal_error("""
            import faulthandler
            faulthandler.enable()
            faulthandler._sigsegv(True)
            """,
            3,
            'Segmentation fault') 

def real_main(argv):
  """The main function."""
  if os.environ.get('APP_TEST_PRINT_ARGV', False):
    sys.stdout.write('argv: {}\n'.format(' '.join(argv)))

  if FLAGS.raise_exception:
    raise MyException

  if FLAGS.raise_usage_error:
    if FLAGS.usage_error_exitcode is not None:
      raise app.UsageError('Error!', FLAGS.usage_error_exitcode)
    else:
      raise app.UsageError('Error!')

  if FLAGS.faulthandler_sigsegv:
    faulthandler._sigsegv()  # pylint: disable=protected-access
    sys.exit(1)  # Should not reach here.

  if FLAGS.print_init_callbacks:
    app.call_after_init(lambda: _callback_results.append('during real_main'))
    for value in _callback_results:
      print('callback: {}'.format(value))
    sys.exit(0)

  # Ensure that we have a random C++ flag in flags.FLAGS; this shows
  # us that app.run() did the right thing in conjunction with C++ flags.
  helper_type = os.environ['APP_TEST_HELPER_TYPE']
  if helper_type == 'clif':
    if 'heap_check_before_constructors' in flags.FLAGS:
      print('PASS: C++ flag present and helper_type is {}'.format(helper_type))
      sys.exit(0)
    else:
      print('FAILED: C++ flag absent but helper_type is {}'.format(helper_type))
      sys.exit(1)
  elif helper_type == 'pure_python':
    if 'heap_check_before_constructors' in flags.FLAGS:
      print('FAILED: C++ flag present but helper_type is pure_python')
      sys.exit(1)
    else:
      print('PASS: C++ flag absent and helper_type is pure_python')
      sys.exit(0)
  else:
    print('Unexpected helper_type "{}"'.format(helper_type))
    sys.exit(1)