* ext/socket/raddrinfo.c (nogvl_getaddrinfo): work around for Ubuntu

13.04's getaddrinfo issue with mdns4. [ruby-list:49420]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@41215 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,8 @@
+Mon Jun 10 20:58:11 2013  NARUSE, Yui  <naruse@ruby-lang.org>
+
+	* ext/socket/raddrinfo.c (nogvl_getaddrinfo): work around for Ubuntu
+	  13.04's getaddrinfo issue with mdns4. [ruby-list:49420]
+
 Mon Jun 10 19:34:39 2013  Tanaka Akira  <akr@fsij.org>
 
 	* bignum.c (rb_integer_pack): Returns sign instead of words.

ext/socket/raddrinfo.c

@@ -157,9 +157,18 @@ struct getaddrinfo_arg
 static void *
 nogvl_getaddrinfo(void *arg)
 {
+    int ret;
     struct getaddrinfo_arg *ptr = arg;
-    return (void *)(VALUE)getaddrinfo(ptr->node, ptr->service,
+    getaddrinfo(ptr->node, ptr->service,
 				      ptr->hints, ptr->res);
+#ifdef __linux__
+    /* On Linux (mainly Ubuntu 13.04) /etc/nsswitch.conf has mdns4 and
+     * it cause getaddrinfo to return EAI_SYSTEM/ENOENT. [ruby-list:49420]
+     */
+    if (ret == EAI_SYSTEM && errno == ENOENT)
+	ret = EAI_NONAME;
+#endif
+    return (void *)(VALUE)ret;
 }
 #endif