1 /*
   2  * Copyright (c) 2000, 2019, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 package sun.nio.ch;
  27 
  28 import java.io.FileDescriptor;
  29 import java.io.IOException;
  30 
  31 import jdk.internal.access.JavaIOFileDescriptorAccess;
  32 import jdk.internal.access.SharedSecrets;
  33 
  34 /**
  35  * Allows different platforms to call different native methods
  36  * for read and write operations.
  37  */
  38 
  39 class SocketDispatcher extends NativeDispatcher {
  40     private static final JavaIOFileDescriptorAccess fdAccess =
  41             SharedSecrets.getJavaIOFileDescriptorAccess();
  42 
  43     SocketDispatcher() { }
  44 
  45     int read(FileDescriptor fd, long address, int len) throws IOException {
  46         return read0(fd, address, len);
  47     }
  48 
  49     long readv(FileDescriptor fd, long address, int len) throws IOException {
  50         return readv0(fd, address, len);
  51     }
  52 
  53     int write(FileDescriptor fd, long address, int len) throws IOException {
  54         return write0(fd, address, len);
  55     }
  56 
  57     long writev(FileDescriptor fd, long address, int len) throws IOException {
  58         return writev0(fd, address, len);
  59     }
  60 
  61     void preClose(FileDescriptor fd) throws IOException {
  62         throw new UnsupportedOperationException();
  63     }
  64 
  65     void close(FileDescriptor fd) throws IOException {
  66         invalidateAndClose(fd);
  67     }
  68 
  69     static void invalidateAndClose(FileDescriptor fd) throws IOException {
  70         assert fd.valid();
  71         int fdVal = fdAccess.get(fd);
  72         fdAccess.set(fd, -1);
  73         close0(fdVal);
  74     }
  75 
  76     // -- Native methods --
  77 
  78     private static native int read0(FileDescriptor fd, long address, int len)
  79         throws IOException;
  80 
  81     private static native long readv0(FileDescriptor fd, long address, int len)
  82         throws IOException;
  83 
  84     private static native int write0(FileDescriptor fd, long address, int len)
  85         throws IOException;
  86 
  87     private static native long writev0(FileDescriptor fd, long address, int len)
  88         throws IOException;
  89 
  90     private static native void close0(int fdVal) throws IOException;
  91 
  92     static {
  93         IOUtil.load();
  94     }
  95 }