From f720851a181afed426c79872a5ae10e7fbf580ea Mon Sep 17 00:00:00 2001
From: Stéphane Raimbault <stephane.raimbault@gmail.com>
Date: Wed, 22 May 2013 23:25:42 +0200
Subject: [PATCH] Use a unsigned long for ioctlsocket on Windows

---
 src/modbus-tcp.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/src/modbus-tcp.c b/src/modbus-tcp.c
index 1212b81..9107f37 100644
--- a/src/modbus-tcp.c
+++ b/src/modbus-tcp.c
@@ -226,8 +226,11 @@ static int _modbus_tcp_set_ipv4_options(int s)
     option = 1;
 #if !defined(SOCK_NONBLOCK) && defined(FIONBIO)
 #ifdef OS_WIN32
-    /* Setting FIONBIO expects an unsigned long according to MSDN */
-    ioctlsocket(s, FIONBIO, &option);
+    {
+        /* Setting FIONBIO expects an unsigned long according to MSDN */
+        u_long loption = 1;
+        ioctlsocket(s, FIONBIO, &loption);
+    }
 #else
     ioctl(s, FIONBIO, &option);
 #endif
--
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