Examples of java.io.FileDescriptor

java.io.FileDescriptor
FileDescriptor is the lowest level representation of a File, Device, or Socket. You can create any of the IO classes which take a FileDescriptor as an argument by querying an open Socket or File for the FileDescriptor.
The FileDescriptor class also contains static fields representing Standard Input, Output and Error. You can use these directly if desired but it is recommended you go through System.in, System.out, and System.err streams respectively.
Applications should not create new FileDescriptors. @see FileInputStream#getFD() @see FileOutputStream#getFD() @see RandomAccessFile#getFD()

        // RandomAccessFile write = new RandomAccessFile(file, "rwd");
        int fileSize = 10 * 1024 * 1024;
        IOUtils.setLength(write, fileSize);
        write.seek(0);
        int i = 0;
        FileDescriptor fd = write.getFD();
        while (true) {
            if (write.getFilePointer() >= fileSize) {
                break;
            }
            write.writeBytes(i + "\r\n");
            fd.sync();
            out.writeInt(i);
            out.flush();
            i++;
        }
        write.close();

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        if (flush) {
            System.out.println("  with FileDescriptor.sync()");
        }
        RandomAccessFile file = new RandomAccessFile("test.txt", mode);
        file.setLength(0);
        FileDescriptor fd = file.getFD();
        long start = System.currentTimeMillis();
        byte[] data = { 0 };
        file.write(data);
        int i = 0;
        if (flush) {
            for (;; i++) {
                file.seek(0);
                file.write(data);
                fd.sync();
                if ((i & 15) == 0) {
                    long time = System.currentTimeMillis() - start;
                    if (time > 5000) {
                        break;
                    }

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  }


  boolean gotReset = false;


  // acquire file descriptor and do the read
  FileDescriptor fd = impl.acquireFD();
   try {  
      n = socketRead0(fd, b, off, length, impl.getTimeout());
      if (n > 0) {
    return n;
      }

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                s.impl.reset();
            }
      si = s.impl;      
      s.impl = null;
      si.address = new InetAddress();
      si.fd = new FileDescriptor();
      getImpl().accept(si);
       
      SecurityManager security = System.getSecurityManager();
      if (security != null) {
    security.checkAccept(si.getInetAddress().getHostAddress(),

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    return;
      }
      throw new ArrayIndexOutOfBoundsException();
  }


  FileDescriptor fd = impl.acquireFD();
  try {
      socketWrite0(fd, b, off, len);
  } catch (SocketException se) {
      if (se instanceof sun.net.ConnectionResetException) {
    impl.setConnectionResetPending();

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    /**
     * Creates a datagram socket
     */
    protected synchronized void create() throws SocketException {
  fd = new FileDescriptor();
  fd1 = new FileDescriptor();
  datagramSocketCreate();
    }

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    /**
     * Creates a socket with a boolean that specifies whether this
     * is a stream socket (true) or an unconnected UDP socket (false).
     */
    protected synchronized void create(boolean stream) throws IOException {
  fd = new FileDescriptor();
  fd1 = new FileDescriptor();
  socketCreate(stream);
  if (socket != null)
      socket.setCreated();
  if (serverSocket != null)
      serverSocket.setCreated();

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     * throws an IOException indicating what went wrong.
     */


    private synchronized void doConnect(InetAddress address, int port, int timeout) throws IOException {
        try {
      FileDescriptor fd = acquireFD();
      try {
          socketConnect(address, port, timeout);
          /* socket may have been closed during poll/select */
          synchronized (fdLock) {
              if (closePending) {

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    /**
     * Accepts connections.
     * @param s the connection
     */
    protected synchronized void accept(SocketImpl s) throws IOException {
  FileDescriptor fd = acquireFD();
  try {
      socketAccept(s);
  } finally {
      releaseFD();
  }

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      this.someElement = null;


      this.someTimestamp = new Timestamp(System.currentTimeMillis());
      
      this.someArrayList = new ArrayList();
      this.someArrayList.add(new FileDescriptor());
      
      this.someFileDescriptor = new FileDescriptor();
      
      this.someNullObject = null;
   }

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