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()

     * Constructor for creating an optionally connected socket channel.
     */
    public SocketChannelImpl(SelectorProvider selectorProvider, boolean connect)
            throws IOException {
        super(selectorProvider);
        fd = new FileDescriptor();
        status = SOCKET_STATUS_UNCONNECTED;
        if (connect) {
            networkSystem.createStreamSocket(fd, true);
        }
    }

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     * For native call.
     */
    @SuppressWarnings("unused")
    private SocketChannelImpl() {
        super(SelectorProvider.provider());
        fd = new FileDescriptor();
        connectAddress = new InetSocketAddress(0);
        status = SOCKET_STATUS_CONNECTED;
    }

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    public PipeEndpointListener(PipeEndpoint endpoint, DatagramDispatcherCallback callback) throws IOException {
        this.endpoint = endpoint;
        this.callback = callback;
        pipe = new RandomAccessFile(endpoint.getPipe(), "rw");
        FileDescriptor fd = pipe.getFD();
        readChannel = new FileInputStream(fd).getChannel();
        writeChannel = new FileOutputStream(fd).getChannel();
        if (log.isDebugEnabled()) {
            log.debug("Pipe " + endpoint.getPipe().getAbsolutePath() + " opened");
        }

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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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    /**
     * 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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        }


        boolean gotReset = false;


        // acquire file descriptor and do the read
        FileDescriptor fd = impl.acquireFD();
        try {
            n = socketRead0(fd, b, off, length, timeout);
            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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            throw (IOException) ex.getException();
        }
    }


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

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  @Test
  public void testOpen() throws Exception {
    LOG.info("Open a missing file without O_CREAT and it should fail");
    try {
      FileDescriptor fd = NativeIO.open(
        new File(TEST_DIR, "doesntexist").getAbsolutePath(),
        NativeIO.O_WRONLY, 0700);
      fail("Able to open a new file without O_CREAT");
    } catch (IOException ioe) {
      // expected
    }


    LOG.info("Test creating a file with O_CREAT");
    FileDescriptor fd = NativeIO.open(
      new File(TEST_DIR, "testWorkingOpen").getAbsolutePath(),
      NativeIO.O_WRONLY | NativeIO.O_CREAT, 0700);
    assertNotNull(true);
    assertTrue(fd.valid());
    FileOutputStream fos = new FileOutputStream(fd);
    fos.write("foo".getBytes());
    fos.close();


    assertFalse(fd.valid());


    LOG.info("Test exclusive create");
    try {
      fd = NativeIO.open(
        new File(TEST_DIR, "testWorkingOpen").getAbsolutePath(),

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