--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/jdk/java/nio/channels/FileChannel/ScatteringRead.java	Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,152 @@
+/*
+ * Copyright (c) 2001, 2010, 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
+   @bug 4452020 4629048 4638365 4869859
+ * @summary Test FileChannel scattering reads
+ * @run main/othervm ScatteringRead
+ */
+
+import java.nio.channels.*;
+import java.nio.*;
+import java.io.*;
+
+public class ScatteringRead {
+
+    private static final int NUM_BUFFERS = 3;
+
+    private static final int BUFFER_CAP = 3;
+
+    private static final int BIG_BUFFER_CAP = Integer.MAX_VALUE / 3 + 10;
+
+    public static void main(String[] args) throws Exception {
+        test1(); // for bug 4452020
+        test2(); // for bug 4629048
+        System.gc();
+
+        // Test 3 proves that the system is capable of reading
+        // more than MAX_INT bytes in one shot. But it is unsuitable
+        // for automated testing because oftentimes less bytes are
+        // read for various reasons, and this is allowed by the spec.
+        // test3(); // for bug 4638365
+    }
+
+    private static void test1() throws Exception {
+        ByteBuffer dstBuffers[] = new ByteBuffer[NUM_BUFFERS];
+        for (int i=0; i<NUM_BUFFERS; i++)
+            dstBuffers[i] = ByteBuffer.allocateDirect(BUFFER_CAP);
+        File blah = File.createTempFile("blah1", null);
+        blah.deleteOnExit();
+        createTestFile(blah);
+
+        FileInputStream fis = new FileInputStream(blah);
+        FileChannel fc = fis.getChannel();
+
+        byte expectedResult = -128;
+        for (int k=0; k<20; k++) {
+            long bytesRead = fc.read(dstBuffers);
+            for (int i=0; i<NUM_BUFFERS; i++) {
+                for (int j=0; j<BUFFER_CAP; j++) {
+                    byte b = dstBuffers[i].get(j);
+                    if (b != expectedResult++)
+                        throw new RuntimeException("Test failed");
+                }
+                dstBuffers[i].flip();
+            }
+        }
+        fis.close();
+    }
+
+    private static void createTestFile(File blah) throws Exception {
+        FileOutputStream fos = new FileOutputStream(blah);
+        for(int i=-128; i<128; i++)
+            fos.write((byte)i);
+        fos.flush();
+        fos.close();
+    }
+
+    private static void test2() throws Exception {
+        ByteBuffer dstBuffers[] = new ByteBuffer[2];
+        for (int i=0; i<2; i++)
+            dstBuffers[i] = ByteBuffer.allocateDirect(10);
+        File blah = File.createTempFile("blah2", null);
+        blah.deleteOnExit();
+        FileOutputStream fos = new FileOutputStream(blah);
+        for(int i=0; i<15; i++)
+            fos.write((byte)92);
+        fos.flush();
+        fos.close();
+
+        FileInputStream fis = new FileInputStream(blah);
+        FileChannel fc = fis.getChannel();
+
+        long bytesRead = fc.read(dstBuffers);
+        if (dstBuffers[1].limit() != 10)
+            throw new Exception("Scattering read changed buf limit.");
+        fis.close();
+    }
+
+    private static void test3() throws Exception {
+        // Only works on 64 bit Solaris
+        String osName = System.getProperty("os.name");
+        if (!osName.startsWith("SunOS"))
+            return;
+        String dataModel = System.getProperty("sun.arch.data.model");
+        if (!dataModel.startsWith("64"))
+            return;
+
+        ByteBuffer dstBuffers[] = new ByteBuffer[NUM_BUFFERS];
+        File f = File.createTempFile("test3", null);
+        f.deleteOnExit();
+        prepTest3File(f, (long)BIG_BUFFER_CAP);
+        RandomAccessFile raf = new RandomAccessFile(f, "rw");
+        FileChannel fc = raf.getChannel();
+        MappedByteBuffer mbb = fc.map(FileChannel.MapMode.READ_WRITE, 0,
+                                      BIG_BUFFER_CAP);
+        for (int i=0; i<NUM_BUFFERS; i++) {
+            dstBuffers[i] = mbb;
+        }
+        fc.close();
+        raf.close();
+
+        // Source must be large
+        FileInputStream fis = new FileInputStream("/dev/zero");
+        fc = fis.getChannel();
+
+        long bytesRead = fc.read(dstBuffers);
+        if (bytesRead <= Integer.MAX_VALUE)
+            throw new RuntimeException("Test 3 failed "+bytesRead+" < "+Integer.MAX_VALUE);
+
+        fc.close();
+        fis.close();
+    }
+
+    static void prepTest3File(File blah, long testSize) throws Exception {
+        RandomAccessFile raf = new RandomAccessFile(blah, "rw");
+        FileChannel fc = raf.getChannel();
+        fc.write(ByteBuffer.wrap("Use the source!".getBytes()), testSize - 40);
+        fc.close();
+        raf.close();
+    }
+
+}