* ext/socket/rubysocket.h (__DARWIN_ALIGNBYTES): workaround of a

bug in system header of darwin 9.  [ruby-core:32341]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@29242 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,8 @@
+Mon Sep 13 19:56:50 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* ext/socket/rubysocket.h (__DARWIN_ALIGNBYTES): workaround of a
+	  bug in system header of darwin 9.  [ruby-core:32341]
+
 Mon Sep 13 18:11:55 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* lib/mkmf.rb (try_do): fix typo.  a patch from Peter Weldon

ext/socket/extconf.rb

@@ -117,8 +117,7 @@ if !have_macro("IPPROTO_IPV6", headers) && have_const("IPPROTO_IPV6", headers)
   }
 end
 
-if (have_func("sendmsg") | have_func("recvmsg")) && /64-darwin/ !~ RUBY_PLATFORM
-  # CMSG_ macros are broken on 64bit darwin, because of use of __DARWIN_ALIGN.
+if have_func("sendmsg") | have_func("recvmsg")
   have_struct_member('struct msghdr', 'msg_control', ['sys/types.h', 'sys/socket.h'])
   have_struct_member('struct msghdr', 'msg_accrights', ['sys/types.h', 'sys/socket.h'])
 end

ext/socket/rubysocket.h

@@ -138,6 +138,16 @@ struct sockaddr_storage {
 };
 #endif
 
+#if defined __APPLE__ && defined __MACH__
+/*
+ * CMSG_ macros are broken on 64bit darwin, because __DARWIN_ALIGN
+ * aligns up to __darwin_size_t which is 64bit, but CMSG_DATA is
+ * 32bit-aligned.
+ */
+#undef __DARWIN_ALIGNBYTES
+#define __DARWIN_ALIGNBYTES (sizeof(unsigned int) - 1)
+#endif
+
 #if defined(_AIX)
 #ifndef CMSG_SPACE
 # define CMSG_SPACE(len) (_CMSG_ALIGN(sizeof(struct cmsghdr)) + _CMSG_ALIGN(len))