diff -r 53f5e16695d0 Lib/socket.py
--- a/Lib/socket.py	Thu Nov 17 01:50:16 2016 -0800
+++ b/Lib/socket.py	Fri Nov 18 00:03:08 2016 +0900
@@ -49,7 +49,7 @@
 import _socket
 from _socket import *
 
-import os, sys, io, selectors
+import os, sys, io, selectors, array
 from enum import IntEnum, IntFlag
 
 try:
@@ -451,6 +451,36 @@
     get_inheritable.__doc__ = "Get the inheritable flag of the socket"
     set_inheritable.__doc__ = "Set the inheritable flag of the socket"
 
+    if hasattr(_socket.socket, 'sendmsg'):
+        def send_io(self, fds):
+            """Send file descriptor to the socket.
+
+            This method works on the platform on which AF_UNIX is defined.
+            """
+            fds_real = []
+            for fd_or_file in fds:
+                if hasattr(fd_or_file, 'fileno'):
+                    fd = fd_or_file.fileno()
+                else:
+                    fd = fd_or_file
+                fds_real.append(fd)
+            self.sendmsg([b"\x00"],
+                         [(_socket.SOL_SOCKET,
+                           _socket.SCM_RIGHTS,
+                           array.array("i", fds_real))])
+        def recv_io(self, max_fds=1024):
+            """Receive file descriptor from the socket.
+
+            This method works on the platform on which AF_UNIX is defined.
+            """
+            fds = array.array("i")
+            msg, ancdata, flags, addr = self.recvmsg(
+                1, _socket.CMSG_LEN(max_fds * fds.itemsize))
+            for cmsg_level, cmsg_type, cmsg_data in ancdata:
+                if (cmsg_level == _socket.SOL_SOCKET and cmsg_type == _socket.SCM_RIGHTS):
+                    fds.frombytes(cmsg_data)
+            return list(fds)
+
 def fromfd(fd, family, type, proto=0):
     """ fromfd(fd, family, type[, proto]) -> socket object