https://github.com/python-trio/trio/commit/0a0b75c914e63366f23790d72caa10bdfcc186f6
https://github.com/python-trio/trio/pull/2061

From a9c54747b90129776f6d2d384e0f64efaac324ee Mon Sep 17 00:00:00 2001
From: "Nathaniel J. Smith" <njs@pobox.com>
Date: Tue, 13 Jul 2021 17:34:26 -0700
Subject: [PATCH] Export IP_RECVTOS, newly added in python 3.10

---
 trio/socket.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/trio/socket.py b/trio/socket.py
index 5402f5bc7..afbcefa1d 100644
--- a/trio/socket.py
+++ b/trio/socket.py
@@ -117,7 +117,7 @@
         J1939_PGN_MAX, J1939_PGN_PDU1_MAX, J1939_PGN_REQUEST,
         SCM_J1939_DEST_ADDR, SCM_J1939_DEST_NAME, SCM_J1939_ERRQUEUE,
         SCM_J1939_PRIO, SO_J1939_ERRQUEUE, SO_J1939_FILTER, SO_J1939_PROMISC,
-        SO_J1939_SEND_PRIO, UDPLITE_RECV_CSCOV, UDPLITE_SEND_CSCOV
+        SO_J1939_SEND_PRIO, UDPLITE_RECV_CSCOV, UDPLITE_SEND_CSCOV, IP_RECVTOS
     )
     # fmt: on
 except ImportError: