/*

 * Copyright (c) 2000, 2019, 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.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * 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.

 */

package sun.nio.ch;

import java.io.FileDescriptor;

import java.io.IOException;

import jdk.internal.access.JavaIOFileDescriptorAccess;

import jdk.internal.access.SharedSecrets;

/**

 * Allows different platforms to call different native methods

 * for read and write operations.

 */

    private static final JavaIOFileDescriptorAccess fdAccess =

            SharedSecrets.getJavaIOFileDescriptorAccess();

        return read0(fd, address, len);

    }

    long readv(FileDescriptor fd, long address, int len) throws IOException {

        return readv0(fd, address, len);

    }

        return write0(fd, address, len);

    }

    long writev(FileDescriptor fd, long address, int len) throws IOException {

        return writev0(fd, address, len);

    }

        throw new UnsupportedOperationException();

    }

        invalidateAndClose(fd);

    }

    static void invalidateAndClose(FileDescriptor fd) throws IOException {

        assert fd.valid();

        int fdVal = fdAccess.get(fd);

        fdAccess.set(fd, -1);

        close0(fdVal);

    }

    // -- Native methods --

    private static native int read0(FileDescriptor fd, long address, int len)

        throws IOException;

    private static native long readv0(FileDescriptor fd, long address, int len)

        throws IOException;

    private static native int write0(FileDescriptor fd, long address, int len)

        throws IOException;

    private static native long writev0(FileDescriptor fd, long address, int len)

        throws IOException;

    private static native void close0(int fdVal) throws IOException;

    static {

        IOUtil.load();

    }

}