Add unix domain socket for Windows

Author: aisk

Lib/test/test_socket.py

@@ -5131,7 +5131,7 @@ def __init__(self, methodName='runTest'):
 
     def _check_defaults(self, sock):
         self.assertIsInstance(sock, socket.socket)
-        if hasattr(socket, 'AF_UNIX'):
+        if sys.platform != 'win32' and hasattr(socket, 'AF_UNIX'):
             self.assertEqual(sock.family, socket.AF_UNIX)
         else:
             self.assertEqual(sock.family, socket.AF_INET)
@@ -6188,6 +6188,8 @@ def bind(self, sock, path):
             else:
                 raise
 
+    @unittest.skipIf(sys.platform == 'win32',
+                     'Windows will raise Error if is not bound')
     def testUnbound(self):
         # Issue #30205 (note getsockname() can return None on OS X)
         self.assertIn(self.sock.getsockname(), ('', None))
@@ -6227,6 +6229,8 @@ def testUnencodableAddr(self):
 
     @unittest.skipIf(sys.platform in ('linux', 'android'),
                      'Linux behavior is tested by TestLinuxAbstractNamespace')
+    @unittest.skipIf(sys.platform == 'win32',
+                     'Windows allow bind on empty path')
     def testEmptyAddress(self):
         # Test that binding empty address fails.
         self.assertRaises(OSError, self.sock.bind, "")

Modules/socketmodule.c

@@ -334,6 +334,8 @@ typedef struct {
 
 /* IMPORTANT: make sure the list ordered by descending build_number */
 static FlagRuntimeInfo win_runtime_flags[] = {
+    /* available starting with Windows 10 1803 */
+    {17134, "AF_UNIX"},
     /* available starting with Windows 10 1709 */
     {16299, "TCP_KEEPIDLE"},
     {16299, "TCP_KEEPINTVL"},

Modules/socketmodule.h

@@ -94,8 +94,11 @@ typedef int socklen_t;
 # include <hvsocket.h>
 #endif /* MS_WINDOWS */
 
+#define HAVE_AFUNIX_H 1
 #ifdef HAVE_SYS_UN_H
 # include <sys/un.h>
+#elif HAVE_AFUNIX_H
+# include <afunix.h>
 #else
 # undef AF_UNIX
 #endif

PC/pyconfig.h

@@ -671,6 +671,9 @@ Py_NO_ENABLE_SHARED to find out.  Also support MS_NO_COREDLL for b/w compat */
 /* Define if you have the <sys/un.h> header file.  */
 /* #define HAVE_SYS_UN_H 1 */
 
+/* Define if you have the <afunix.h> header file.  */
+#define HAVE_AFUNIX_H 1
+
 /* Define if you have the <sys/utime.h> header file.  */
 /* #define HAVE_SYS_UTIME_H 1 */