Python _winapi.CloseHandle() Examples

def test_pipe_handle(self):
        h, _ = windows_utils.pipe(overlapped=(True, True))
        _winapi.CloseHandle(_)
        p = windows_utils.PipeHandle(h)
        self.assertEqual(p.fileno(), h)
        self.assertEqual(p.handle, h)

        # check garbage collection of p closes handle
        with warnings.catch_warnings():
            warnings.filterwarnings("ignore", "",  ResourceWarning)
            del p
            support.gc_collect()
        try:
            _winapi.CloseHandle(h)
        except OSError as e:
            self.assertEqual(e.winerror, 6)     # ERROR_INVALID_HANDLE
        else:
            raise RuntimeError('expected ERROR_INVALID_HANDLE') 

def _unregister_wait_cb(self, fut):
        if self._event is not None:
            _winapi.CloseHandle(self._event)
            self._event = None
            self._event_fut = None

        # If the wait was cancelled, the wait may never be signalled, so
        # it's required to unregister it. Otherwise, IocpProactor.close() will
        # wait forever for an event which will never come.
        #
        # If the IocpProactor already received the event, it's safe to call
        # _unregister() because we kept a reference to the Overlapped object
        # which is used as an unique key.
        self._proactor._unregister(self._ov)
        self._proactor = None

        super()._unregister_wait_cb(fut) 

def steal_handle(source_pid, handle):
        '''Steal a handle from process identified by source_pid.'''
        source_process_handle = _winapi.OpenProcess(
            _winapi.PROCESS_DUP_HANDLE, False, source_pid)
        try:
            return _winapi.DuplicateHandle(
                source_process_handle, handle,
                _winapi.GetCurrentProcess(), 0, False,
                _winapi.DUPLICATE_SAME_ACCESS | _winapi.DUPLICATE_CLOSE_SOURCE)
        finally:
            _winapi.CloseHandle(source_process_handle) 

def _unregister_wait_cb(self, fut):
        if self._event is not None:
            _winapi.CloseHandle(self._event)
            self._event = None
            self._event_fut = None

        # If the wait was cancelled, the wait may never be signalled, so
        # it's required to unregister it. Otherwise, IocpProactor.close() will
        # wait forever for an event which will never come.
        #
        # If the IocpProactor already received the event, it's safe to call
        # _unregister() because we kept a reference to the Overlapped object
        # which is used as a unique key.
        self._proactor._unregister(self._ov)
        self._proactor = None

        super()._unregister_wait_cb(fut) 

def test_pipe_handle(self):
        h, _ = windows_utils.pipe(overlapped=(True, True))
        _winapi.CloseHandle(_)
        p = windows_utils.PipeHandle(h)
        self.assertEqual(p.fileno(), h)
        self.assertEqual(p.handle, h)

        # check garbage collection of p closes handle
        with warnings.catch_warnings():
            warnings.filterwarnings("ignore", "",  ResourceWarning)
            del p
            support.gc_collect()
        try:
            _winapi.CloseHandle(h)
        except OSError as e:
            self.assertEqual(e.winerror, 6)     # ERROR_INVALID_HANDLE
        else:
            raise RuntimeError('expected ERROR_INVALID_HANDLE') 

def test_pipe_handle(self):
        h, _ = windows_utils.pipe(overlapped=(True, True))
        _winapi.CloseHandle(_)
        p = windows_utils.PipeHandle(h)
        self.assertEqual(p.fileno(), h)
        self.assertEqual(p.handle, h)

        # check garbage collection of p closes handle
        with warnings.catch_warnings():
            warnings.filterwarnings("ignore", "",  ResourceWarning)
            del p
            support.gc_collect()
        try:
            _winapi.CloseHandle(h)
        except OSError as e:
            self.assertEqual(e.winerror, 6)     # ERROR_INVALID_HANDLE
        else:
            raise RuntimeError('expected ERROR_INVALID_HANDLE') 

def _unregister_wait_cb(self, fut):
        if self._event is not None:
            _winapi.CloseHandle(self._event)
            self._event = None
            self._event_fut = None

        # If the wait was cancelled, the wait may never be signalled, so
        # it's required to unregister it. Otherwise, IocpProactor.close() will
        # wait forever for an event which will never come.
        #
        # If the IocpProactor already received the event, it's safe to call
        # _unregister() because we kept a reference to the Overlapped object
        # which is used as a unique key.
        self._proactor._unregister(self._ov)
        self._proactor = None

        super()._unregister_wait_cb(fut) 

def test_wait_for_handle_cancel(self):
        event = _overlapped.CreateEvent(None, True, False, None)
        self.addCleanup(_winapi.CloseHandle, event)

        # Wait for unset event with a cancelled future;
        # CancelledError should be raised immediately
        fut = self.loop._proactor.wait_for_handle(event, 10)
        fut.cancel()
        start = self.loop.time()
        with self.assertRaises(asyncio.CancelledError):
            self.loop.run_until_complete(fut)
        elapsed = self.loop.time() - start
        self.assertTrue(0 <= elapsed < 0.1, elapsed)

        # Tulip issue #195: cancelling a _WaitHandleFuture twice must not crash
        fut = self.loop._proactor.wait_for_handle(event)
        fut.cancel()
        fut.cancel() 

def _unregister_wait_cb(self, fut):
        if self._event is not None:
            _winapi.CloseHandle(self._event)
            self._event = None
            self._event_fut = None

        # If the wait was cancelled, the wait may never be signalled, so
        # it's required to unregister it. Otherwise, IocpProactor.close() will
        # wait forever for an event which will never come.
        #
        # If the IocpProactor already received the event, it's safe to call
        # _unregister() because we kept a reference to the Overlapped object
        # which is used as a unique key.
        self._proactor._unregister(self._ov)
        self._proactor = None

        super()._unregister_wait_cb(fut) 

def _unregister_wait_cb(self, fut):
        if self._event is not None:
            _winapi.CloseHandle(self._event)
            self._event = None
            self._event_fut = None

        # If the wait was cancelled, the wait may never be signalled, so
        # it's required to unregister it. Otherwise, IocpProactor.close() will
        # wait forever for an event which will never come.
        #
        # If the IocpProactor already received the event, it's safe to call
        # _unregister() because we kept a reference to the Overlapped object
        # which is used as an unique key.
        self._proactor._unregister(self._ov)
        self._proactor = None

        super()._unregister_wait_cb(fut) 

def accept(self):
            self._handle_queue.append(self._new_handle())
            handle = self._handle_queue.pop(0)
            try:
                ov = _winapi.ConnectNamedPipe(handle, overlapped=True)
            except OSError as e:
                if e.winerror != _winapi.ERROR_NO_DATA:
                    raise
                # ERROR_NO_DATA can occur if a client has already connected,
                # written data and then disconnected -- see Issue 14725.
            else:
                try:
                    res = _winapi.WaitForMultipleObjects(
                        [ov.event], False, INFINITE)
                except:
                    ov.cancel()
                    _winapi.CloseHandle(handle)
                    raise
                finally:
                    _, err = ov.GetOverlappedResult(True)
                    assert err == 0
            return PipeConnection(handle) 

def _unregister_wait_cb(self, fut):
        if self._event is not None:
            _winapi.CloseHandle(self._event)
            self._event = None
            self._event_fut = None

        # If the wait was cancelled, the wait may never be signalled, so
        # it's required to unregister it. Otherwise, IocpProactor.close() will
        # wait forever for an event which will never come.
        #
        # If the IocpProactor already received the event, it's safe to call
        # _unregister() because we kept a reference to the Overlapped object
        # which is used as an unique key.
        self._proactor._unregister(self._ov)
        self._proactor = None

        super()._unregister_wait_cb(fut) 

def test_pipe_handle(self):
        h, _ = windows_utils.pipe(overlapped=(True, True))
        _winapi.CloseHandle(_)
        p = windows_utils.PipeHandle(h)
        self.assertEqual(p.fileno(), h)
        self.assertEqual(p.handle, h)

        # check garbage collection of p closes handle
        with warnings.catch_warnings():
            warnings.filterwarnings("ignore", "",  ResourceWarning)
            del p
            support.gc_collect()
        try:
            _winapi.CloseHandle(h)
        except OSError as e:
            self.assertEqual(e.winerror, 6)     # ERROR_INVALID_HANDLE
        else:
            raise RuntimeError('expected ERROR_INVALID_HANDLE') 

def test_wait_for_handle(self):
        event = _overlapped.CreateEvent(None, True, False, None)
        self.addCleanup(_winapi.CloseHandle, event)

        # Wait for unset event with 0.5s timeout;
        # result should be False at timeout
        fut = self.loop._proactor.wait_for_handle(event, 0.5)
        start = self.loop.time()
        done = self.loop.run_until_complete(fut)
        elapsed = self.loop.time() - start

        self.assertEqual(done, False)
        self.assertFalse(fut.result())
        self.assertTrue(0.48 < elapsed < 0.9, elapsed)

        _overlapped.SetEvent(event)

        # Wait for set event;
        # result should be True immediately
        fut = self.loop._proactor.wait_for_handle(event, 10)
        start = self.loop.time()
        done = self.loop.run_until_complete(fut)
        elapsed = self.loop.time() - start

        self.assertEqual(done, True)
        self.assertTrue(fut.result())
        self.assertTrue(0 <= elapsed < 0.3, elapsed)

        # Tulip issue #195: cancelling a done _WaitHandleFuture must not crash
        fut.cancel() 

def __init__(self, handle, access, pid=None):
            if pid is None:
                # We just duplicate the handle in the current process and
                # let the receiving process steal the handle.
                pid = os.getpid()
            proc = _winapi.OpenProcess(_winapi.PROCESS_DUP_HANDLE, False, pid)
            try:
                self._handle = _winapi.DuplicateHandle(
                    _winapi.GetCurrentProcess(),
                    handle, proc, access, False, 0)
            finally:
                _winapi.CloseHandle(proc)
            self._access = access
            self._pid = pid 

def close(self, *, CloseHandle=_winapi.CloseHandle):
        if self._handle is not None:
            CloseHandle(self._handle)
            self._handle = None 

def detach(self):
            '''Get the handle.  This should only be called once.'''
            # retrieve handle from process which currently owns it
            if self._pid == os.getpid():
                # The handle has already been duplicated for this process.
                return self._handle
            # We must steal the handle from the process whose pid is self._pid.
            proc = _winapi.OpenProcess(_winapi.PROCESS_DUP_HANDLE, False,
                                       self._pid)
            try:
                return _winapi.DuplicateHandle(
                    proc, self._handle, _winapi.GetCurrentProcess(),
                    self._access, False, _winapi.DUPLICATE_CLOSE_SOURCE)
            finally:
                _winapi.CloseHandle(proc) 

def Close(self, CloseHandle=_winapi.CloseHandle):
            if not self.closed:
                self.closed = True
                CloseHandle(self) 

def CloseHandle(h):
                if isinstance(h, numbers.Integral):
                    # Cast long to int for 64-bit Python 2.7 under Windows
                    h = int(h)
                if sys.version_info[:2] < (3, 3):
                    if not isinstance(h, int):
                        h = h.Detach()
                    win32.CloseHandle(h)
                else:
                    win_api.CloseHandle(h) 

def _pid_alive(pid):
    """Check if the process with this PID is alive or not.

    Args:
        pid: The pid to check.

    Returns:
        This returns false if the process is dead. Otherwise, it returns true.
    """
    no_such_process = errno.EINVAL if sys.platform == "win32" else errno.ESRCH
    alive = True
    try:
        if sys.platform == "win32":
            SYNCHRONIZE = 0x00100000  # access mask defined in <winnt.h>
            handle = _winapi.OpenProcess(SYNCHRONIZE, False, pid)
            try:
                alive = (_winapi.WaitForSingleObject(handle, 0) !=
                         _winapi.WAIT_OBJECT_0)
            finally:
                _winapi.CloseHandle(handle)
        else:
            os.kill(pid, 0)
    except OSError as ex:
        if ex.errno != no_such_process:
            raise
        alive = False
    return alive 

def _finalize_pipe_listener(queue, address):
            util.sub_debug('closing listener with address=%r', address)
            for handle in queue:
                _winapi.CloseHandle(handle) 

def _finalize_pipe_listener(queue, address):
            util.sub_debug('closing listener with address=%r', address)
            for handle in queue:
                _winapi.CloseHandle(handle) 

def _close(self, _CloseHandle=_winapi.CloseHandle):
            _CloseHandle(self._handle) 

def detach(self):
            '''Get the handle.  This should only be called once.'''
            # retrieve handle from process which currently owns it
            if self._pid == os.getpid():
                # The handle has already been duplicated for this process.
                return self._handle
            # We must steal the handle from the process whose pid is self._pid.
            proc = _winapi.OpenProcess(_winapi.PROCESS_DUP_HANDLE, False,
                                       self._pid)
            try:
                return _winapi.DuplicateHandle(
                    proc, self._handle, _winapi.GetCurrentProcess(),
                    self._access, False, _winapi.DUPLICATE_CLOSE_SOURCE)
            finally:
                _winapi.CloseHandle(proc) 

def __init__(self, handle, access, pid=None):
            if pid is None:
                # We just duplicate the handle in the current process and
                # let the receiving process steal the handle.
                pid = os.getpid()
            proc = _winapi.OpenProcess(_winapi.PROCESS_DUP_HANDLE, False, pid)
            try:
                self._handle = _winapi.DuplicateHandle(
                    _winapi.GetCurrentProcess(),
                    handle, proc, access, False, 0)
            finally:
                _winapi.CloseHandle(proc)
            self._access = access
            self._pid = pid 

def steal_handle(source_pid, handle):
        '''Steal a handle from process identified by source_pid.'''
        source_process_handle = _winapi.OpenProcess(
            _winapi.PROCESS_DUP_HANDLE, False, source_pid)
        try:
            return _winapi.DuplicateHandle(
                source_process_handle, handle,
                _winapi.GetCurrentProcess(), 0, False,
                _winapi.DUPLICATE_SAME_ACCESS | _winapi.DUPLICATE_CLOSE_SOURCE)
        finally:
            _winapi.CloseHandle(source_process_handle) 

def close(self, *, CloseHandle=_winapi.CloseHandle):
        if self._handle is not None:
            CloseHandle(self._handle)
            self._handle = None 

def __init__(self, process_obj):
        prep_data = spawn.get_preparation_data(process_obj._name)

        # read end of pipe will be "stolen" by the child process
        # -- see spawn_main() in spawn.py.
        rhandle, whandle = _winapi.CreatePipe(None, 0)
        wfd = msvcrt.open_osfhandle(whandle, 0)
        cmd = spawn.get_command_line(parent_pid=os.getpid(),
                                     pipe_handle=rhandle)
        cmd = ' '.join('"%s"' % x for x in cmd)

        with open(wfd, 'wb', closefd=True) as to_child:
            # start process
            try:
                hp, ht, pid, tid = _winapi.CreateProcess(
                    spawn.get_executable(), cmd,
                    None, None, False, 0, None, None, None)
                _winapi.CloseHandle(ht)
            except:
                _winapi.CloseHandle(rhandle)
                raise

            # set attributes of self
            self.pid = pid
            self.returncode = None
            self._handle = hp
            self.sentinel = int(hp)
            util.Finalize(self, _winapi.CloseHandle, (self.sentinel,))

            # send information to child
            context.set_spawning_popen(self)
            try:
                reduction.dump(prep_data, to_child)
                reduction.dump(process_obj, to_child)
            finally:
                context.set_spawning_popen(None) 

def Close(self, CloseHandle=_winapi.CloseHandle):
            if not self.closed:
                self.closed = True
                CloseHandle(self) 

def detach(self):
            # retrieve handle from process which currently owns it
            if self._pid == os.getpid():
                return self._handle
            proc = _winapi.OpenProcess(_winapi.PROCESS_DUP_HANDLE, False,
                                       self._pid)
            try:
                return _winapi.DuplicateHandle(
                    proc, self._handle, _winapi.GetCurrentProcess(),
                    self._access, False, _winapi.DUPLICATE_CLOSE_SOURCE)
            finally:
                _winapi.CloseHandle(proc)