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()

    public int getDownstream() {
        return this.fileDescriptors[DOWNSTREAM];
    }


    public void open(int fd, boolean readable, boolean writable) throws NoSuchFieldException, IllegalAccessException, IOException {
        FileDescriptor fileDesc = UnsafeFs.createFileDescriptor(fd);


        if (fd == 0) {
            openInput(fd, fileDesc);
        } else if (fd == 1 || fd == 2) {
            openOutput(fd, fileDesc);

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        Class<?> cls = UnsafeTcp.class.getClassLoader().loadClass("sun.nio.ch.SocketChannelImpl");


        Constructor<?> ctor = cls.getDeclaredConstructor(SelectorProvider.class, FileDescriptor.class, InetSocketAddress.class);


        SelectorProvider provider = SelectorProvider.provider();
        FileDescriptor fileDesc = UnsafeFs.createFileDescriptor( fd );


        ctor.setAccessible(true);
        SocketChannel socketChannel = (SocketChannel) ctor.newInstance(provider, fileDesc, null);


        return socketChannel;

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  @Test
  public void testOpenMissingWithoutCreate() 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 (NativeIOException nioe) {
      LOG.info("Got expected exception", nioe);

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  }


  @Test
  public void testOpenWithCreate() throws Exception {
    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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   * "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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      bld.setMessage(e.getMessage());
    }
    try {
      bld.build().writeDelimitedTo(socketOut);
      if (fis != null) {
        FileDescriptor fds[] = new FileDescriptor[fis.length];
        for (int i = 0; i < fds.length; i++) {
          fds[i] = fis[i].getFD();
        }
        byte buf[] = new byte[] { (byte)0 };
        peer.getDomainSocket().

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    ShortCircuitShmResponseProto.newBuilder().setStatus(SUCCESS).
        setId(PBHelper.convert(shmInfo.shmId)).build().
        writeDelimitedTo(socketOut);
    // Send the file descriptor for the shared memory segment.
    byte buf[] = new byte[] { (byte)0 };
    FileDescriptor shmFdArray[] =
        new FileDescriptor[] { shmInfo.stream.getFD() };
    sock.sendFileDescriptors(shmFdArray, buf, 0, buf.length);
  }

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      return; // can't proceed without open file
    }


    try
    {
      FileDescriptor fd = raf.getFD();
    }
    catch (IOException e)
    {
      harness.fail("getFD(): Can't get FileDescriptor");

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     * Constructor
     */
    public ServerSocketChannelImpl(SelectorProvider sp) throws IOException {
        super(sp);
        status = SERVER_STATUS_OPEN;
        fd = new FileDescriptor();
        Platform.getNetworkSystem().createServerStreamSocket(fd,
                NetUtil.preferIPv4Stack());
        impl = SocketImplProvider.getServerSocketImpl(fd);
        socket = new ServerSocketAdapter(impl, this);
    }

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    // for native call
    private ServerSocketChannelImpl() throws IOException {
        super(SelectorProvider.provider());
        status = SERVER_STATUS_OPEN;
        fd = new FileDescriptor();
        impl = SocketImplProvider.getServerSocketImpl(fd);        
        socket = new ServerSocketAdapter(impl, this);
        isBound = false;
    }

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