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()

    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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    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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      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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      return new FileInputStream(f);
    } else {
      // Use Windows native interface to create a FileInputStream that
      // shares delete permission on the file opened.
      //
      FileDescriptor fd = Windows.createFile(
          f.getAbsolutePath(),
          Windows.GENERIC_READ,
          Windows.FILE_SHARE_READ |
              Windows.FILE_SHARE_WRITE |
              Windows.FILE_SHARE_DELETE,

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    } else {
      // Use Windows native interface to create a FileInputStream that
      // shares delete permission on the file opened, and set it to the
      // given offset.
      //
      FileDescriptor fd = NativeIO.Windows.createFile(
          f.getAbsolutePath(),
          NativeIO.Windows.GENERIC_READ,
          NativeIO.Windows.FILE_SHARE_READ |
              NativeIO.Windows.FILE_SHARE_WRITE |
              NativeIO.Windows.FILE_SHARE_DELETE,

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  public static FileOutputStream getCreateForWriteFileOutputStream(File f, int permissions)
      throws IOException {
    if (!Shell.WINDOWS) {
      // Use the native wrapper around open(2)
      try {
        FileDescriptor fd = NativeIO.POSIX.open(f.getAbsolutePath(),
            NativeIO.POSIX.O_WRONLY | NativeIO.POSIX.O_CREAT
                | NativeIO.POSIX.O_EXCL, permissions);
        return new FileOutputStream(fd);
      } catch (NativeIOException nioe) {
        if (nioe.getErrno() == Errno.EEXIST) {
          throw new AlreadyExistsException(nioe);
        }
        throw nioe;
      }
    } else {
      // Use the Windows native APIs to create equivalent FileOutputStream
      try {
        FileDescriptor fd = NativeIO.Windows.createFile(f.getCanonicalPath(),
            NativeIO.Windows.GENERIC_WRITE,
            NativeIO.Windows.FILE_SHARE_DELETE
                | NativeIO.Windows.FILE_SHARE_READ
                | NativeIO.Windows.FILE_SHARE_WRITE,
            NativeIO.Windows.CREATE_NEW);

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        fail("Got unexpected exception: " + writerException.getMessage());
      } finally {
        writer.close();
      }


      FileDescriptor fd = NativeIO.Windows.createFile(
          testfile.getCanonicalPath(),
          NativeIO.Windows.GENERIC_READ,
          NativeIO.Windows.FILE_SHARE_READ |
          NativeIO.Windows.FILE_SHARE_WRITE |
          NativeIO.Windows.FILE_SHARE_DELETE,

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    try {
      File testfile = new File(TEST_DIR, "testCreateFile");
      assertTrue("Create test subject",
          testfile.exists() || testfile.createNewFile());


      FileDescriptor fd = NativeIO.Windows.createFile(
          testfile.getCanonicalPath(),
          NativeIO.Windows.GENERIC_READ,
          NativeIO.Windows.FILE_SHARE_READ |
          NativeIO.Windows.FILE_SHARE_WRITE |
          NativeIO.Windows.FILE_SHARE_DELETE,

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      return;
    }


    LOG.info("Open a missing file without O_CREAT and it should fail");
    try {
      FileDescriptor fd = NativeIO.POSIX.open(
        new File(TEST_DIR, "doesntexist").getAbsolutePath(),
        NativeIO.POSIX.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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    if (Path.WINDOWS) {
      return;
    }


    LOG.info("Test creating a file with O_CREAT");
    FileDescriptor fd = NativeIO.POSIX.open(
      new File(TEST_DIR, "testWorkingOpen").getAbsolutePath(),
      NativeIO.POSIX.O_WRONLY | NativeIO.POSIX.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.POSIX.open(
        new File(TEST_DIR, "testWorkingOpen").getAbsolutePath(),

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