use fork to isolate rlimit effect.

git-svn-id: http://svn.ruby-lang.org/repos/ruby/branches/ruby_1_8@10355 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 12 insertions, 7 deletions

diff --git a/test/ruby/test_process.rb b/test/ruby/test_process.rb
index 5c3035ea9..dc04c60f4 100644
--- a/test/ruby/test_process.rb
+++ b/test/ruby/test_process.rb
@@ -21,12 +21,17 @@ class TestProcess < Test::Unit::TestCase
 
   def test_rlimit_nofile
     return unless rlimit_exist?
-    cur_nofile, max_nofile = Process.getrlimit(Process::RLIMIT_NOFILE)
-    Process.setrlimit(Process::RLIMIT_NOFILE, 0, max_nofile)
-    begin
-      assert_raise(Errno::EMFILE) { IO.pipe }
-    ensure
-      Process.setrlimit(Process::RLIMIT_NOFILE, cur_nofile, max_nofile)
-    end
+    pid = fork {
+      cur_nofile, max_nofile = Process.getrlimit(Process::RLIMIT_NOFILE)
+      Process.setrlimit(Process::RLIMIT_NOFILE, 0, max_nofile)
+      begin
+        IO.pipe
+      rescue Errno::EMFILE
+        exit 0
+      end
+      exit 1
+    }
+    Process.wait pid
+    assert_equal(0, $?.to_i)
   end
 end