src/java.base/share/classes/sun/nio/ch/NativeDispatcher.java
author erikj
Tue, 12 Sep 2017 19:03:39 +0200
changeset 47216 71c04702a3d5
parent 25859 jdk/src/java.base/share/classes/sun/nio/ch/NativeDispatcher.java@3317bb8137f4
child 58801 119ac9128c1b
child 59146 455612b3161a
permissions -rw-r--r--
8187443: Forest Consolidation: Move files to unified layout Reviewed-by: darcy, ihse
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/*
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 * Copyright (c) 2000, 2013, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.  Oracle designates this
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 * particular file as subject to the "Classpath" exception as provided
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 * by Oracle in the LICENSE file that accompanied this code.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 */
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package sun.nio.ch;
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import java.io.*;
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/**
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 * Allows different platforms to call different native methods
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 * for read and write operations.
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 */
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abstract class NativeDispatcher
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{
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    abstract int read(FileDescriptor fd, long address, int len)
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        throws IOException;
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    /**
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     * Returns {@code true} if pread/pwrite needs to be synchronized with
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     * position sensitive methods.
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     */
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    boolean needsPositionLock() {
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        return false;
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    }
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    int pread(FileDescriptor fd, long address, int len, long position)
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        throws IOException
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    {
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        throw new IOException("Operation Unsupported");
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    }
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    abstract long readv(FileDescriptor fd, long address, int len)
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        throws IOException;
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    abstract int write(FileDescriptor fd, long address, int len)
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        throws IOException;
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    int pwrite(FileDescriptor fd, long address, int len, long position)
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        throws IOException
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    {
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        throw new IOException("Operation Unsupported");
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    }
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    abstract long writev(FileDescriptor fd, long address, int len)
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        throws IOException;
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    abstract void close(FileDescriptor fd) throws IOException;
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    // Prepare the given fd for closing by duping it to a known internal fd
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    // that's already closed.  This is necessary on some operating systems
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    // (Solaris and Linux) to prevent fd recycling.
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    //
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    void preClose(FileDescriptor fd) throws IOException {
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        // Do nothing by default; this is only needed on Unix
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    }
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}