From 80e1c43ddf8099d0ebc4735d405942c4c5f6925c Mon Sep 17 00:00:00 2001
From: Giampaolo Rodola' <g.rodola@gmail.com>
Date: Tue, 21 May 2013 21:02:04 +0200
Subject: [PATCH] Fix issue #17996: expose socket.AF_LINK constant on BSD and
 OSX.

---
 Doc/library/socket.rst | 5 +++++
 Misc/NEWS              | 2 ++
 Modules/socketmodule.c | 3 +++
 3 files changed, 10 insertions(+)

diff --git a/Doc/library/socket.rst b/Doc/library/socket.rst
index aa59f7fc439..edd196a89ba 100644
--- a/Doc/library/socket.rst
+++ b/Doc/library/socket.rst
@@ -293,6 +293,11 @@ The module :mod:`socket` exports the following constants and functions:
    TIPC related constants, matching the ones exported by the C socket API. See
    the TIPC documentation for more information.
 
+.. data:: AF_LINK
+
+  Availability: BSD, OSX.
+
+  .. versionadded:: 3.4
 
 .. data:: has_ipv6
 
diff --git a/Misc/NEWS b/Misc/NEWS
index 2027e65f3e8..a025c7073ed 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -99,6 +99,8 @@ Core and Builtins
 Library
 -------
 
+- Issue #17996: socket module now exposes AF_LINK constant on BSD and OSX.
+
 - Issue #17900: Allowed pickling of recursive OrderedDicts.  Decreased pickled
   size and pickling time.
 
diff --git a/Modules/socketmodule.c b/Modules/socketmodule.c
index 20db3d94641..fa75a102f24 100644
--- a/Modules/socketmodule.c
+++ b/Modules/socketmodule.c
@@ -5658,6 +5658,9 @@ PyInit__socket(void)
     /* Alias to emulate 4.4BSD */
     PyModule_AddIntMacro(m, AF_ROUTE);
 #endif
+#ifdef AF_LINK
+    PyModule_AddIntMacro(m, AF_LINK);
+#endif
 #ifdef AF_ASH
     /* Ash */
     PyModule_AddIntMacro(m, AF_ASH);