Ignore ENOPROTOOPT errors from SO_REUSEADDR or SO_ERROR on AF_UNIX sockets, for
systems which do not implement them there.

Index: python-tornado-3.2.0/tornado/netutil.py
===================================================================
--- python-tornado-3.2.0.orig/tornado/netutil.py
+++ python-tornado-3.2.0/tornado/netutil.py
@@ -119,7 +119,11 @@ if hasattr(socket, 'AF_UNIX'):
         """
         sock = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
         set_close_exec(sock.fileno())
-        sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
+        try:
+            sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
+        except socket.error as e:
+            if e.args[0] != errno.ENOPROTOOPT:
+                raise
         sock.setblocking(0)
         try:
             st = os.stat(file)
Index: python-tornado-3.2.0/tornado/iostream.py
===================================================================
--- python-tornado-3.2.0.orig/tornado/iostream.py
+++ python-tornado-3.2.0/tornado/iostream.py
@@ -748,7 +748,12 @@ class IOStream(BaseIOStream):
         self._add_io_state(self.io_loop.WRITE)
 
     def _handle_connect(self):
-        err = self.socket.getsockopt(socket.SOL_SOCKET, socket.SO_ERROR)
+        try:
+            err = self.socket.getsockopt(socket.SOL_SOCKET, socket.SO_ERROR)
+        except socket.error as e:
+            err = e.args[0]
+            if err == errno.ENOPROTOOPT:
+                err = 0
         if err != 0:
             self.error = socket.error(err, os.strerror(err))
             # IOLoop implementations may vary: some of them return