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()

   * "Too many open files" if we leaked fds using this access pattern.
   */
  @Test
  public void testFDDoesntLeak() throws IOException {
    for (int i = 0; i < 10000; i++) {
      FileDescriptor fd = NativeIO.open(
        new File(TEST_DIR, "testNoFdLeak").getAbsolutePath(),
        NativeIO.O_WRONLY | NativeIO.O_CREAT, 0700);
      assertNotNull(true);
      assertTrue(fd.valid());
      FileOutputStream fos = new FileOutputStream(fd);
      fos.write("foo".getBytes());
      fos.close();
    }
  }

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     * @param channel The channel for the new descriptor
     * @param originalModes The mode flags for the new descriptor
     * @param fileDescriptor The java.io.FileDescriptor object for the new descriptor
     */
    public ChannelDescriptor(Channel channel, ModeFlags originalModes) {
        this(channel, getNewFileno(), originalModes, new FileDescriptor(), new AtomicInteger(1), true);
    }

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        // The reason why we need the stream is to be able to invoke available() on it.
        // STDIN in Java is non-interruptible, non-selectable, and attempt to read
        // on such stream might lead to thread being blocked without *any* way to unblock it.
        // That's where available() comes it, so at least we could check whether
        // anything is available to be read without blocking.
        this(Channels.newChannel(baseInputStream), getNewFileno(), originalModes, new FileDescriptor(), new AtomicInteger(1), true);
        this.baseInputStream = baseInputStream;
    }

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     *
     * @param channel The channel for the new descriptor
     * @param fileDescriptor The java.io.FileDescriptor object for the new descriptor
     */
    public ChannelDescriptor(Channel channel) throws InvalidValueException {
        this(channel, getModesFromChannel(channel), new FileDescriptor());
    }

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     *
     * @throws IOException if the tar file could not be flushed
     */
    void flush() throws IOException {
        synchronized (file) {
            FileDescriptor descriptor = null;


            synchronized (this) {
                if (access != null && !closed) {
                    descriptor = access.getFD();
                }
            }


            if (descriptor != null) {
                descriptor.sync();
            }
        }
    }

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    /**
     * Creates a datagram socket
     */
    protected synchronized void create() throws SocketException {
        ResourceManager.beforeUdpCreate();
        fd = new FileDescriptor();
        try {
            datagramSocketCreate();
        } catch (SocketException ioe) {
            ResourceManager.afterUdpClose();
            fd = null;

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    protected synchronized void create(boolean stream) throws IOException {
        this.stream = stream;
        if (!stream) {
            ResourceManager.beforeUdpCreate();
            // only create the fd after we know we will be able to create the socket
            fd = new FileDescriptor();
            try {
                socketCreate(false);
            } catch (IOException ioe) {
                ResourceManager.afterUdpClose();
                fd = null;
                throw ioe;
            }
        } else {
            fd = new FileDescriptor();
            socketCreate(true);
        }
        if (socket != null)
            socket.setCreated();
        if (serverSocket != null)

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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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            throw (IOException) ex.getException();
        }
    }


    static FileDescriptor newFileDescriptor(int fd) {
        FileDescriptor fileDescriptor = new FileDescriptor();
        fdAccess.set(fileDescriptor, fd);
        return fileDescriptor;
    }

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    doReadahead();
  }


  private static FileDescriptor getFileDescriptorIfAvail(InputStream in) {
    FileDescriptor fd = null;
    try {
      if (in instanceof HasFileDescriptor) {
        fd = ((HasFileDescriptor)in).getFileDescriptor();
      } else if (in instanceof FileInputStream) {
        fd = ((FileInputStream)in).getFD();

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