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()

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

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        }
        
        openFile = new OpenFile();
        
        try {
            openFile.setMainStream(new ChannelStream(runtime, new ChannelDescriptor(channel, getNewFileno(), new FileDescriptor())));
        } catch (InvalidValueException e) {
            throw getRuntime().newErrnoEINVALError();
        }
        
        openFile.setMode(openFile.getMainStream().getModes().getOpenFileFlags());

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                }
                
                ChannelDescriptor main = new ChannelDescriptor(
                        inChannel,
                        getNewFileno(),
                        new FileDescriptor());
                main.setCanBeSeekable(false);
                
                openFile.setMainStream(new ChannelStream(getRuntime(), main));
                registerDescriptor(main);
            }
            
            if (openFile.isWritable()) {
                Channel outChannel;
                if (process.getOutput() != null) {
                    // NIO-based
                    outChannel = process.getOutput();
                } else {
                    outChannel = Channels.newChannel(process.getOutputStream());
                }


                ChannelDescriptor pipe = new ChannelDescriptor(
                        outChannel,
                        getNewFileno(),
                        new FileDescriptor());
                pipe.setCanBeSeekable(false);
                
                if (openFile.getMainStream() != null) {
                    openFile.setPipeStream(new ChannelStream(getRuntime(), pipe));
                } else {

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    private long fileLength;
    private boolean isOpen;


    public NativeUnixIndexOutput(File path, int bufferSize) throws IOException {
      //this.path = path;
      final FileDescriptor fd = NativePosixUtil.open_direct(path.toString(), false);
      fos = new FileOutputStream(fd);
      //fos = new FileOutputStream(path);
      channel = fos.getChannel();
      buffer = ByteBuffer.allocateDirect(bufferSize);
      this.bufferSize = bufferSize;

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    private long filePos;
    private int bufferPos;


    public NativeUnixIndexInput(File path, int bufferSize) throws IOException {
      super("NativeUnixIndexInput(path=\"" + path.getPath() + "\")");
      final FileDescriptor fd = NativePosixUtil.open_direct(path.toString(), true);
      fis = new FileInputStream(fd);
      channel = fis.getChannel();
      this.bufferSize = bufferSize;
      buffer = ByteBuffer.allocateDirect(bufferSize);
      isOpen = true;

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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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    if (skipSecurity) {
      return insecureCreateForWrite(f, permissions);
    } else {
      // Use the native wrapper around open(2)
      try {
        FileDescriptor fd = NativeIO.open(f.getAbsolutePath(),
          NativeIO.O_WRONLY | NativeIO.O_CREAT | NativeIO.O_EXCL,
          permissions);
        return new FileOutputStream(fd);
      } catch (NativeIOException nioe) {
        if (nioe.getErrno() == Errno.EEXIST) {

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     * Invokes <code>getFD().sync()</code> on the underlying
     * <code>RandomAccessFile</code>.
     */
    public void flush() throws IOException {
  // Fix: 4636212.  When this FIleDescriptor is not valid, do nothing.
  FileDescriptor fd = file.getFD();
        if(fd.valid()) 
      fd.sync();
    }

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