`asyncio` `ProactorEventLoop` didn't check if the `socket` is blocking

[NewUserHa]

Bug report

Bug description:

import asyncio
import socket

s = socket.socket()
await asyncio.get_running_loop().sock_connect(s,('127.0.0.1',80))

according to https://docs.python.org/3/library/asyncio-eventloop.html#asyncio.loop.sock_connect and

cpython/Lib/asyncio/selector_events.py

Lines 617 to 630 in 5d8a3e7

	async def sock_connect(self, sock, address):
	"""Connect to a remote socket at address.
	This method is a coroutine.
	"""
	base_events._check_ssl_socket(sock)
	if self._debug and sock.gettimeout() != 0:
	raise ValueError("the socket must be non-blocking")
	if sock.family == socket.AF_INET or (
	base_events._HAS_IPv6 and sock.family == socket.AF_INET6):
	resolved = await self._ensure_resolved(
	address, family=sock.family, type=sock.type, proto=sock.proto,
	loop=self,

it should raise. however, ProactorEventLoop doesn't follow the rule

should we fix this, any thoughts

CPython versions tested on:

3.12

Operating systems tested on:

Windows

Linked PRs

• gh-113892: Add a extra check to ProactorEventLoop.sock_connect to ensure that the given socket is in non-blocking mode #119519
• [3.13] gh-113892: Add a extra check to ProactorEventLoop.sock_connect to ensure that the given socket is in non-blocking mode (GH-119519) #119912
• [3.12] gh-113892: Add a extra check to ProactorEventLoop.sock_connect to ensure that the given socket is in non-blocking mode (GH-119519) #119913

[gvanrossum]

Oh, interesting. The question is, does async sending and receiving using that blocked socket work when using the ProactorEventLoop? Given how different IOCP is, it wouldn't surprise me if it did. Can you write a small test to check that? (There are probably tests you can adapt.)

[NewUserHa]

ok