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[] select(SelectableChannel[] readChannels,
      SelectableChannel[] writeChannels, long timeout)
      throws SocketException {


    FileDescriptor fdHandler = null;
    int countRead = readChannels.length;
    int countWrite = writeChannels.length;
    int result = 0, val;
    FileDescriptor[] readFDs = new FileDescriptor[countRead];
    int[] flags = new int[countRead + countWrite];

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                // if newImpl is not an instance of PlainSocketImpl, use
                // reflection to get/set protected fields.
                if (null == fdField) {
                    fdField = getSocketImplField("fd"); // $NON-NLS-1$
                }
                FileDescriptor newFd = (FileDescriptor) fdField.get(newImpl);
                netImpl.acceptStreamSocket(fd, newImpl, newFd, receiveTimeout);


                if (null == localportField) {
                    localportField = getSocketImplField("localport"); // $NON-NLS-1$
                }

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                        shutdownOutput();
                    } catch (Exception e) {
                    }
                }
                netImpl.socketClose(fd);
                fd = new FileDescriptor();
            }
        }
    }

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        this.localPort = localPort;
    }


    public PlainDatagramSocketImpl() {
        super();
        fd = new FileDescriptor();
    }

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            if (fd.valid()) {
                try {
                    netImpl.socketClose(fd);
                } catch (IOException e) {
                }
                fd = new FileDescriptor();
            }
        }
    }

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     * Constructor
     */
    protected DatagramChannelImpl(SelectorProvider selectorProvider)
            throws IOException {
        super(selectorProvider);
        fd = new FileDescriptor();
        networkSystem.createDatagramSocket(fd, true);
    }

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    /*
     * for native call
     */
    private DatagramChannelImpl() throws IOException {
        super(SelectorProvider.provider());
        fd = new FileDescriptor();
        connectAddress = new InetSocketAddress(0);
    }

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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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     * Constructor
     */
    public SocketChannelImpl(SelectorProvider selectorProvider)
            throws IOException {
        super(selectorProvider);
        fd = new FileDescriptor();
        status = SOCKET_STATUS_UNCONNECTED;
        networkSystem.createSocket(fd, true);
    }

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    /*
     * for native call
     */
    private SocketChannelImpl() throws IOException {
    super(SelectorProvider.provider());
    fd = new FileDescriptor();
    connectAddress = new InetSocketAddress(0);
    status = SOCKET_STATUS_CONNECTED;
  }

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