Async TCP server swallows listen errors #1242
Description
Versions
- Python: 3.10
- OS: Arch Linux, up to date
- Pymodbus: 3.0.2
- Modbus Hardware (if used): n/a
Pymodbus Specific
- Server: tcp async
Description
When running on desktop, I forgot to change the port. On Linux a regular user cannot listen on port <1024. The exception is silent, and only shows where I hit Ctrl+C to close the program.
Code and Logs
Seems straightforward enough to reproduce, under Linux start an async TCP server listening on 127.0.0.1:502. I can provide a minimal reproduction in a separate repository if needed.
^CTraceback (most recent call last):
File "/usr/lib/python3.10/runpy.py", line 196, in _run_module_as_main
return _run_code(code, main_globals, None,
File "/usr/lib/python3.10/runpy.py", line 86, in _run_code
exec(code, run_globals)
File "/home/jaskij/projects/engine/fosfory/pymodbus_test/pymodbus_test/__main__.py", line 39, in <module>
asyncio.run(main())
File "/usr/lib/python3.10/asyncio/runners.py", line 44, in run
return loop.run_until_complete(main)
File "/usr/lib/python3.10/asyncio/base_events.py", line 636, in run_until_complete
self.run_forever()
File "/usr/lib/python3.10/asyncio/base_events.py", line 603, in run_forever
self._run_once()
File "/usr/lib/python3.10/asyncio/base_events.py", line 1868, in _run_once
event_list = self._selector.select(timeout)
File "/usr/lib/python3.10/selectors.py", line 469, in select
fd_event_list = self._selector.poll(timeout, max_ev)
KeyboardInterrupt
Task exception was never retrieved
future: <Task finished name='Task-4' coro=<ModbusTcpServer.serve_forever() done, defined at /home/jaskij/.cache/pypoetry/virtualenvs/pymodbus-test-fOaPahLU-py3.10/lib/python3.10/site-packages/pymodbus/server/async_io.py:545> exception=PermissionError(13, "error while attempting to bind on address ('127.0.0.1', 502): permission denied")>
Traceback (most recent call last):
File "/home/jaskij/.cache/pypoetry/virtualenvs/pymodbus-test-fOaPahLU-py3.10/lib/python3.10/site-packages/pymodbus/server/async_io.py", line 548, in serve_forever
self.server = await self.loop.create_server(
File "/usr/lib/python3.10/asyncio/base_events.py", line 1513, in create_server
raise OSError(err.errno, 'error while attempting '
PermissionError: [Errno 13] error while attempting to bind on address ('127.0.0.1', 502): permission denied