--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/jdk/com/sun/management/UnixOperatingSystemMXBean/GetOpenFileDescriptorCount.java	Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,78 @@
+/*
+ * Copyright (c) 2003, 2004, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+/*
+ * @bug     4858522
+ * @summary Basic unit test of UnixOperatingSystemMXBean.getOpenFileDescriptorCount()
+ * @author  Steve Bohne
+ */
+
+/*
+ * This test is just a sanity check and does not check for the correct
+ * value.  The correct value should be checked manually:
+ * Solaris/Linux:
+ *   1. Find the pid of the java process.
+ *   2. In a shell, enter the command: "ls -1 /proc/<pid>/fd | wc -l"
+ */
+
+import com.sun.management.UnixOperatingSystemMXBean;
+import java.lang.management.*;
+
+public class GetOpenFileDescriptorCount {
+
+    private static UnixOperatingSystemMXBean mbean =
+        (UnixOperatingSystemMXBean)ManagementFactory.getOperatingSystemMXBean();
+
+    // Careful with these values.
+    private static final long MIN_COUNT_FOR_PASS = 1;
+    // Max count for pass dynamically determined below
+    private static long       max_count_for_pass = Long.MAX_VALUE;
+
+    private static boolean trace = false;
+
+    public static void main(String args[]) throws Exception {
+        if (args.length > 0 && args[0].equals("trace")) {
+            trace = true;
+        }
+
+        long max_count = mbean.getMaxFileDescriptorCount();
+        if (max_count > 0) {
+            max_count_for_pass = max_count;
+        }
+
+        long count = mbean.getOpenFileDescriptorCount();
+
+        if (trace) {
+            System.out.println("Open file descriptor count: " + count);
+        }
+
+        if (count < MIN_COUNT_FOR_PASS || count > max_count_for_pass) {
+            throw new RuntimeException("Open file descriptor count " +
+                                       "illegal value: " + count + " bytes " +
+                                       "(MIN = " + MIN_COUNT_FOR_PASS + "; " +
+                                       "MAX = " + max_count_for_pass + ")");
+        }
+
+        System.out.println("Test passed.");
+    }
+}