* process.c (rb_exec_err): should preserve errno.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@35903 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,7 @@
+Mon Jun  4 14:06:12 2012  NAKAMURA Usaku  <usa@ruby-lang.org>
+
+	* process.c (rb_exec_err): should preserve errno.
+
 Mon Jun  4 13:10:11 2012  NAKAMURA Usaku  <usa@ruby-lang.org>
 
 	* test/dl/test_c_{struct,union}_entity.rb: broken require.

process.c

@@ -2591,7 +2591,7 @@ rb_exec_err(const struct rb_exec_arg *e, char *errmsg, size_t errmsg_buflen)
         proc_exec_v(prog, e->argv_str, e->envp_str);
     }
 #if !defined(HAVE_FORK)
-    rb_run_exec_options_err(sargp, NULL, errmsg, errmsg_buflen);
+    preserving_errno(rb_run_exec_options_err(sargp, NULL, errmsg, errmsg_buflen));
 #else
 # undef sargp
 #endif