Fixes for KFreeBSD and the Hurd:

- Issue #21274: Define PATH_MAX for GNU/Hurd in Python/pythonrun.c.

- Issue #21276: posixmodule: Don't define USE_XATTRS on KFreeBSD and the Hurd.

- Issue #21275: Fix a socket test on KFreeBSD.

Lib/test/test_socket.py

@@ -867,7 +867,7 @@ class GeneralModuleTests(unittest.TestCase):
         # Find one service that exists, then check all the related interfaces.
         # I've ordered this by protocols that have both a tcp and udp
         # protocol, at least for modern Linuxes.
-        if (sys.platform.startswith(('freebsd', 'netbsd'))
+        if (sys.platform.startswith(('freebsd', 'netbsd', 'gnukfreebsd'))
             or sys.platform in ('linux', 'darwin')):
             # avoid the 'echo' service on this platform, as there is an
             # assumption breaking non-standard port/protocol entry

Misc/NEWS

@@ -10,6 +10,8 @@ Release date: TBA
 Core and Builtins
 -----------------
 
+- Issue #21274: Define PATH_MAX for GNU/Hurd in Python/pythonrun.c.
+
 - Issue #21209: Fix sending tuples to custom generator objects with the yield
   from syntax.
 
@@ -158,6 +160,11 @@ Library
 - Issue #21209: Fix asyncio.tasks.CoroWrapper to workaround a bug
   in yield-from implementation in CPythons prior to 3.4.1.
 
+Extension Modules
+-----------------
+
+- Issue #21276: posixmodule: Don't define USE_XATTRS on KFreeBSD and the Hurd.
+
 IDLE
 ----
 
@@ -200,6 +207,8 @@ Documentation
 Tests
 -----
 
+- Issue #21275: Fix a socket test on KFreeBSD.
+
 - Issue #21223: Pass test_site/test_startup_imports when some of the extensions
   are built as builtins.
 

Modules/posixmodule.c

@@ -92,7 +92,7 @@ corresponding Unix manual entries for more information on calls.");
 #undef HAVE_SCHED_SETAFFINITY
 #endif
 
-#if defined(HAVE_SYS_XATTR_H) && defined(__GLIBC__)
+#if defined(HAVE_SYS_XATTR_H) && defined(__GLIBC__) && !defined(__FreeBSD_kernel__) && !defined(__GNU__)
 #define USE_XATTRS
 #endif
 

Python/pythonrun.c

@@ -35,6 +35,10 @@
 #define PATH_MAX MAXPATHLEN
 #endif
 
+#ifdef __gnu_hurd__
+#define PATH_MAX MAXPATHLEN
+#endif
+
 _Py_IDENTIFIER(builtins);
 _Py_IDENTIFIER(excepthook);
 _Py_IDENTIFIER(flush);