Remove unused code

As of python 3.5 socket_pair is supported on windows as well

src/calibre/srv/utils.py

@@ -5,8 +5,7 @@
 __license__ = 'GPL v3'
 __copyright__ = '2015, Kovid Goyal <kovid at kovidgoyal.net>'
 
-import errno, socket, select, os, time
-from contextlib import closing
+import errno, socket, os, time
 from email.utils import formatdate
 from operator import itemgetter
 
@@ -146,41 +145,10 @@ def stop_cork(sock):
         sock.setsockopt(socket.IPPROTO_TCP, socket.TCP_CORK, 0)
 
 
-def create_sock_pair(port=0):
+def create_sock_pair():
     '''Create socket pair. Works also on windows by using an ephemeral TCP port.'''
-    if hasattr(socket, 'socketpair'):
-        client_sock, srv_sock = socket.socketpair()
-        set_socket_inherit(client_sock, False), set_socket_inherit(srv_sock, False)
-        return client_sock, srv_sock
-
-    # Create a non-blocking temporary server socket
-    temp_srv_sock = socket.socket()
-    set_socket_inherit(temp_srv_sock, False)
-    temp_srv_sock.setblocking(False)
-    temp_srv_sock.bind(('127.0.0.1', port))
-    port = temp_srv_sock.getsockname()[1]
-    temp_srv_sock.listen(1)
-    with closing(temp_srv_sock):
-        # Create non-blocking client socket
-        client_sock = socket.socket()
-        client_sock.setblocking(False)
-        set_socket_inherit(client_sock, False)
-        try:
-            client_sock.connect(('127.0.0.1', port))
-        except socket.error as err:
-            # EWOULDBLOCK is not an error, as the socket is non-blocking
-            if err.errno not in socket_errors_nonblocking:
-                raise
-
-        # Use select to wait for connect() to succeed.
-        timeout = 1
-        readable = select.select([temp_srv_sock], [], [], timeout)[0]
-        if temp_srv_sock not in readable:
-            raise Exception('Client socket not connected in {} second(s)'.format(timeout))
-        srv_sock = temp_srv_sock.accept()[0]
-        set_socket_inherit(srv_sock, False)
-        client_sock.setblocking(True)
-
+    client_sock, srv_sock = socket.socketpair()
+    set_socket_inherit(client_sock, False), set_socket_inherit(srv_sock, False)
     return client_sock, srv_sock