akr	2014-01-21 22:39:08 +0900 (Tue, 21 Jan 2014)

  New Revision: 44678

  http://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=rev&revision=44678

  Log:
    Several more OS information for TYPE_IP_MULTICAST_LOOP and
    TYPE_IP_MULTICAST_TTL.

  Modified files:
    trunk/ext/socket/option.c
Index: ext/socket/option.c
===================================================================
--- ext/socket/option.c	(revision 44677)
+++ ext/socket/option.c	(revision 44678)
@@ -7,10 +7,21 @@ VALUE rb_cSockOpt; https://github.com/ruby/ruby/blob/trunk/ext/socket/option.c#L7
 #define CAT(x,y) x##y
 #define XCAT(x,y) CAT(x,y)
 
-#if defined(__linux__) || defined(__FreeBSD__) || defined(__APPLE__) || defined(_WIN32)
+#if defined(__linux__) || \
+    defined(__GNU__) /* GNU/Hurd */ || \
+    defined(__FreeBSD__) || \
+    defined(__DragonFly__) || \
+    defined(__APPLE__) || \
+    defined(_WIN32) || \
+    defined(__CYGWIN__)
 # define TYPE_IP_MULTICAST_LOOP int
 # define TYPE_IP_MULTICAST_TTL int
 #else
+/* The original IP multicast implementation by Steve Deering
+ * NetBSD
+ * OpenBSD
+ * SunOS
+ */
 # define TYPE_IP_MULTICAST_LOOP byte
 # define TYPE_IP_MULTICAST_TTL byte
 # define USE_INSPECT_BYTE 1

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