init.c: glibc bug

* ext/socket/init.c (rsock_raise_socket_error): get rid of a glibc
  bug.  [ruby-core:71100] [Bug #11600]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@52190 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,8 @@
+Mon Oct 19 10:33:46 2015  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* ext/socket/init.c (rsock_raise_socket_error): get rid of a glibc
+	  bug.  [ruby-core:71100] [Bug #11600]
+
 Mon Oct 19 01:26:26 2015  NAKAMURA Usaku  <usa@ruby-lang.org>
 
 	* file.c (rb_file_identical_p): not necessary to compare the paths after

ext/socket/init.c

@@ -35,7 +35,9 @@ void
 rsock_raise_socket_error(const char *reason, int error)
 {
 #ifdef EAI_SYSTEM
-    if (error == EAI_SYSTEM) rb_sys_fail(reason);
+    int e;
+    if (error == EAI_SYSTEM && (e = errno) != 0)
+	rb_syserr_fail(e, reason);
 #endif
     rb_raise(rb_eSocket, "%s: %s", reason, gai_strerror(error));
 }