--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/gc/6941923/Test6941923.java	Tue Apr 09 15:32:45 2013 +0200
@@ -0,0 +1,121 @@
+/*
+ * Copyright (c) 2012, 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.
+ */
+
+/*
+ * @test Test6941923.java
+ * @bug 6941923
+ * @summary test flags for gc log rotation
+ * @library /testlibrary
+ * @run main/othervm/timeout=600 Test6941923
+ *
+ */
+import com.oracle.java.testlibrary.*;
+import java.io.File;
+import java.io.FilenameFilter;
+import java.util.ArrayList;
+import java.util.Arrays;
+
+class GCLoggingGenerator {
+
+    public static void main(String[] args) throws Exception {
+
+        long sizeOfLog = Long.parseLong(args[0]);
+        long lines = sizeOfLog / 80;
+        // full.GC generates ad least 1-line which is not shorter then 80 chars
+        // for some GC 2 shorter lines are generated
+        for (long i = 0; i < lines; i++) {
+            System.gc();
+        }
+    }
+}
+
+public class Test6941923 {
+
+    static final File currentDirectory = new File(".");
+    static final String logFileName = "test.log";
+    static final int logFileSizeK = 16;
+    static FilenameFilter logFilter = new FilenameFilter() {
+        @Override
+        public boolean accept(File dir, String name) {
+            return name.startsWith(logFileName);
+        }
+    };
+
+    public static void cleanLogs() {
+        for (File log : currentDirectory.listFiles(logFilter)) {
+            if (!log.delete()) {
+                throw new Error("Unable to delete " + log.getAbsolutePath());
+            }
+        }
+    }
+
+    public static void runTest(int numberOfFiles) throws Exception {
+
+        ArrayList<String> args = new ArrayList();
+        String[] logOpts = new String[]{
+            "-cp", System.getProperty("java.class.path"),
+            "-Xloggc:" + logFileName,
+            "-XX:-DisableExplicitGC", // to sure that System.gc() works
+            "-XX:+PrintGC", "-XX:+PrintGCDetails", "-XX:+UseGCLogFileRotation",
+            "-XX:NumberOfGCLogFiles=" + numberOfFiles,
+            "-XX:GCLogFileSize=" + logFileSizeK + "K", "-Xmx128M"};
+        // System.getProperty("test.java.opts") is '' if no options is set
+        // need to skip such empty
+        String[] externalVMopts = System.getProperty("test.java.opts").length() == 0
+                ? new String[0]
+                : System.getProperty("test.java.opts").split(" ");
+        args.addAll(Arrays.asList(externalVMopts));
+        args.addAll(Arrays.asList(logOpts));
+        args.add(GCLoggingGenerator.class.getName());
+        args.add(String.valueOf(numberOfFiles * logFileSizeK * 1024));
+        ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(args.toArray(new String[0]));
+        pb.redirectErrorStream(true);
+        pb.redirectOutput(new File(GCLoggingGenerator.class.getName() + ".log"));
+        Process process = pb.start();
+        int result = process.waitFor();
+        if (result != 0) {
+            throw new Error("Unexpected exit code = " + result);
+        }
+        File[] logs = currentDirectory.listFiles(logFilter);
+        int smallFilesNumber = 0;
+        for (File log : logs) {
+            if (log.length() < logFileSizeK * 1024) {
+                smallFilesNumber++;
+            }
+        }
+        if (logs.length != numberOfFiles) {
+            throw new Error("There are only " + logs.length + " logs instead " + numberOfFiles);
+        }
+        if (smallFilesNumber > 1) {
+            throw new Error("There should maximum one log with size < " + logFileSizeK + "K");
+        }
+    }
+
+    public static void main(String[] args) throws Exception {
+        cleanLogs();
+        runTest(1);
+        cleanLogs();
+        runTest(3);
+        cleanLogs();
+    }
+}