From e4f1a35fd8498f708d1c1bcbe0ac77ed318cf35b Mon Sep 17 00:00:00 2001
From: Iris <58442094+sleepyStick@users.noreply.github.com>
Date: Mon, 24 Jul 2023 16:06:18 -0700
Subject: [PATCH] PYTHON-3864 add types to socket_checker.py (#1323)

---
 pymongo/socket_checker.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/pymongo/socket_checker.py b/pymongo/socket_checker.py
index a27889895..a83311cd0 100644
--- a/pymongo/socket_checker.py
+++ b/pymongo/socket_checker.py
@@ -25,7 +25,7 @@ _HAVE_POLL = hasattr(select, "poll") and not sys.platform.startswith("java")
 _SelectError = getattr(select, "error", OSError)
 
 
-def _errno_from_exception(exc):
+def _errno_from_exception(exc: BaseException) -> Optional[int]:
     if hasattr(exc, "errno"):
         return exc.errno
     if exc.args: