set KEEPALIVE except windows

shadowsocks/tcprelay.py

@@ -26,6 +26,7 @@ import logging
 import binascii
 import traceback
 import random
+import platform
 
 from shadowsocks import encrypt, obfs, eventloop, shell, common
 from shadowsocks.common import pre_parse_header, parse_header
@@ -564,6 +565,7 @@ class TCPRelayHandler(object):
         else:
             remote_sock.setsockopt(socket.SOL_TCP, socket.TCP_NODELAY, 1)
             remote_sock.setsockopt(socket.SOL_SOCKET, socket.SO_KEEPALIVE, 1)
+            if platform.system() != 'Windows':
                 remote_sock.setsockopt(socket.SOL_TCP, socket.TCP_KEEPIDLE, 120)
                 remote_sock.setsockopt(socket.SOL_TCP, socket.TCP_KEEPINTVL, 20)
                 remote_sock.setsockopt(socket.SOL_TCP, socket.TCP_KEEPCNT, 5)