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()


  @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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     *
     * @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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     *
     * @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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        return isReachableByMultiThread(netif, ttl, timeout, false);
    }


    private boolean isReachableByTCP(InetAddress dest, InetAddress source,
            int timeout) throws IOException {
        FileDescriptor fd = new FileDescriptor();
        // define traffic only for parameter
        int traffic = 0;
        boolean reached = false;
        NETIMPL.createSocket(fd, NetUtil.preferIPv4Stack());
        try {

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        return isReachableByMultiThread(netif, ttl, timeout, false);
    }


    private boolean isReachableByTCP(InetAddress dest, InetAddress source,
            int timeout) throws IOException {
        FileDescriptor fd = new FileDescriptor();
        // define traffic only for parameter
        int traffic = 0;
        boolean reached = false;
        NETIMPL.createStreamSocket(fd, NetUtil.preferIPv4Stack());
        try {

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

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

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        // add to keys storage
        keys[c] = sk;


        // cache the fields
        int ops = sk.interestOps();
        FileDescriptor fd = ((FileDescriptorHandler) sk.channel()).getFD();


        // presume that we have no FD associated
        keysToReadableFDs[c] = -1;
        keysToWritableFDs[c] = -1;

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