Exception in cli on windows #1681
Description
Hello!
Starting from 15.0 windows cli throws exception.
(v) D:\temp\ws>python -m websockets ws://127.0.0.1:8765
Connected to ws://127.0.0.1:8765.
> Exception in callback _ProactorReadPipeTransport._loop_reading()
handle: <Handle _ProactorReadPipeTransport._loop_reading()>
Traceback (most recent call last):
File "C:\Users\Danstiv\AppData\Local\Python\pythoncore-3.13-64\Lib\asyncio\proactor_events.py", line 306, in _loop_reading
self._read_fut = self._loop._proactor.recv_into(self._sock, self._data)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\Danstiv\AppData\Local\Python\pythoncore-3.13-64\Lib\asyncio\windows_events.py", line 497, in recv_into
self._register_with_iocp(conn)
~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^
File "C:\Users\Danstiv\AppData\Local\Python\pythoncore-3.13-64\Lib\asyncio\windows_events.py", line 710, in _register_with_iocp
_overlapped.CreateIoCompletionPort(obj.fileno(), self._iocp, 0, 0)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
OSError: [WinError 6] Неверный дескриптор
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "C:\Users\Danstiv\AppData\Local\Python\pythoncore-3.13-64\Lib\asyncio\events.py", line 89, in _run
self._context.run(self._callback, *self._args)
~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\Danstiv\AppData\Local\Python\pythoncore-3.13-64\Lib\asyncio\proactor_events.py", line 316, in _loop_reading
self._fatal_error(exc, 'Fatal read error on pipe transport')
~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\Danstiv\AppData\Local\Python\pythoncore-3.13-64\Lib\asyncio\proactor_events.py", line 132, in _fatal_error
self._force_close(exc)
~~~~~~~~~~~~~~~~~^^^^^
File "C:\Users\Danstiv\AppData\Local\Python\pythoncore-3.13-64\Lib\asyncio\proactor_events.py", line 135, in _force_close
if self._empty_waiter is not None and not self._empty_waiter.done():
^^^^^^^^^^^^^^^^^^
AttributeError: '_ProactorReadPipeTransport' object has no attribute '_empty_waiter'
For some reason it is hangs completely with example asyncio server and not accepting input, but with uvicorn+websockets+fastapi i can send and receive despite the exception.