JRUBY-2109: Rubicon test_io's test_reopen1 fails after IO reorg.

Regression tests are provided as part of rubyspecs.


git-svn-id: http://svn.codehaus.org/jruby/trunk/jruby@5924 961051c9-f516-0410-bf72-c9f7e237a7b7

src/org/jruby/util/io/ChannelStream.java

@@ -795,7 +795,13 @@ public boolean isBlocking() {
     public synchronized void freopen(String path, ModeFlags modes) throws DirectoryAsFileException, IOException, InvalidValueException, PipeException, BadDescriptorException {
         // flush first
         flushWrite();
-
+
+        // reset buffer
+        buffer.clear();
+        if (reading) {
+            buffer.flip();
+        }
+
         this.modes = modes;
         String cwd = getRuntime().getCurrentDirectory();
         JRubyFile theFile = JRubyFile.create(cwd,path);