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 static ChannelDescriptor open(String cwd, String path, ModeFlags flags, int perm, POSIX posix) throws FileNotFoundException, DirectoryAsFileException, FileExistsException, IOException {
        boolean fileCreated = false;
        if (path.equals("/dev/null") || path.equalsIgnoreCase("nul:") || path.equalsIgnoreCase("nul")) {
            Channel nullChannel = new NullChannel();
            // FIXME: don't use RubyIO for this
            return new ChannelDescriptor(nullChannel, RubyIO.getNewFileno(), flags, new FileDescriptor());
        } else if(path.startsWith("file:")) {
            String filePath = path.substring(5, path.indexOf("!"));
            String internalPath = path.substring(path.indexOf("!") + 2);


            if (!new File(filePath).exists()) {
                throw new FileNotFoundException(path);
            }
            
            JarFile jf = new JarFile(filePath);
            ZipEntry zf = jf.getEntry(internalPath);


            if(zf == null) {
                throw new FileNotFoundException(path);
            }


            InputStream is = jf.getInputStream(zf);
            // FIXME: don't use RubyIO for this
            return new ChannelDescriptor(Channels.newChannel(is), RubyIO.getNewFileno(), flags, new FileDescriptor());
        } else {
            JRubyFile theFile = JRubyFile.create(cwd,path);


            if (theFile.isDirectory() && flags.isWritable()) {
                throw new DirectoryAsFileException();

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                }
            }


            socket_address = new InetSocketAddress(addr, portInt);
            ssc.socket().bind(socket_address);
            initSocket(context.getRuntime(), new ChannelDescriptor(ssc, RubyIO.getNewFileno(), new ModeFlags(ModeFlags.RDWR), new FileDescriptor()));
        } catch (InvalidValueException ex) {
            throw context.getRuntime().newErrnoEINVALError();
        } catch(UnknownHostException e) {
            throw sockerr(context.getRuntime(), "initialize: name or service not known");
        } catch(BindException e) {

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                            connected.configureBlocking(false);
                            connected.configureBlocking(true);
                        }
        
                        // otherwise one key has been selected (ours) so we get the channel and hand it off
                        socket.initSocket(context.getRuntime(), new ChannelDescriptor(connected, RubyIO.getNewFileno(), new ModeFlags(ModeFlags.RDWR), new FileDescriptor()));
                    } catch (InvalidValueException ex) {
                        throw context.getRuntime().newErrnoEINVALError();
                    }
                    return socket;
                }

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                // no connection immediately accepted, let them try again
                throw context.getRuntime().newErrnoEAGAINError("Resource temporarily unavailable");
            } else {
                try {
                    // otherwise one key has been selected (ours) so we get the channel and hand it off
                    socket.initSocket(context.getRuntime(), new ChannelDescriptor(ssc.accept(), RubyIO.getNewFileno(), new ModeFlags(ModeFlags.RDWR), new FileDescriptor()));
                } catch (InvalidValueException ex) {
                    throw context.getRuntime().newErrnoEINVALError();
                }
                return socket;
            }

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                channel = SocketChannel.open();
            } else if(soType == SOCK_DGRAM) {
                channel = DatagramChannel.open();
            }
            
            initSocket(context.getRuntime(), new ChannelDescriptor(channel, RubyIO.getNewFileno(), new ModeFlags(ModeFlags.RDWR), new FileDescriptor()));
        } catch (InvalidValueException ex) {
            throw context.getRuntime().newErrnoEINVALError();
        } catch(IOException e) {
            throw sockerr(context.getRuntime(), "initialize: " + e.toString());
        }

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    @JRubyMethod(visibility = Visibility.PRIVATE)
    public IRubyObject initialize(ThreadContext context) {
        try {
            DatagramChannel channel = DatagramChannel.open();
            initSocket(context.getRuntime(), new ChannelDescriptor(channel, RubyIO.getNewFileno(), new ModeFlags(ModeFlags.RDWR), new FileDescriptor()));
        } catch (org.jruby.util.io.InvalidValueException ex) {
            throw context.getRuntime().newErrnoEINVALError();
        } catch (ConnectException e) {
            throw context.getRuntime().newErrnoECONNREFUSEDError();
        } catch (UnknownHostException e) {

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    public RubyFile(Ruby runtime, String path, InputStream in) {
        super(runtime, runtime.getFile());
        this.path = path;
        try {
            this.openFile.setMainStream(new ChannelStream(runtime, new ChannelDescriptor(Channels.newChannel(in), getNewFileno(), new FileDescriptor())));
        } catch (InvalidValueException ex) {
            throw runtime.newErrnoEINVALError();
        }
        this.openFile.setMode(openFile.getMainStream().getModes().getOpenFileFlags());
        registerDescriptor(openFile.getMainStream().getDescriptor());

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        if (descriptor.isOpen()) {
            descriptor.close();
        }
        
        if (path.equals("/dev/null") || path.equalsIgnoreCase("nul:") || path.equalsIgnoreCase("nul")) {
            descriptor = new ChannelDescriptor(new NullChannel(), descriptor.getFileno(), modes, new FileDescriptor());
        } else {
            String cwd = getRuntime().getCurrentDirectory();
            JRubyFile theFile = JRubyFile.create(cwd,path);


            if (theFile.isDirectory() && modes.isWritable()) throw new DirectoryAsFileException();

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                Socket socket = channel.socket();
                socket.bind(new InetSocketAddress(InetAddress.getByName(localHost), localPort));
                socket.connect(new InetSocketAddress(InetAddress.getByName(remoteHost), remotePort));
            }
            channel.finishConnect();
            initSocket(context.getRuntime(), new ChannelDescriptor(channel, RubyIO.getNewFileno(), new ModeFlags(ModeFlags.RDWR), new FileDescriptor()));
        } catch (InvalidValueException ex) {
            throw context.getRuntime().newErrnoEINVALError();
        } catch(ConnectException e) {
            throw context.getRuntime().newErrnoECONNREFUSEDError();
        } catch(UnknownHostException e) {

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        }
        
        openFile = new OpenFile();
        
        try {
            openFile.setMainStream(new ChannelStream(runtime, new ChannelDescriptor(Channels.newChannel(outputStream), getNewFileno(), new FileDescriptor())));
        } catch (InvalidValueException e) {
            throw getRuntime().newErrnoEINVALError();
        }
        
        openFile.setMode(OpenFile.WRITABLE | OpenFile.APPEND);

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