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 void test (TestHarness harness)
  {
   try {
      FileOutputStream fos = new FileOutputStream("tmpfile");
      try {
        FileDescriptor fd = fos.getFD();
        harness.check(fd.valid(), "valid()");
      try {
      fd.sync();
      harness.check(true, "sync()");
    }
    catch (SyncFailedException e) {
      harness.debug(e);
      harness.fail("SyncFailedException thrown");

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     * @tests java.io.FileOutputStream#write(byte[], int, int)
     */
    public void test_write$BII3() throws IOException {
        // Regression for HARMONY-834
        // no exception expected
        new FileOutputStream(new FileDescriptor()).write(new byte[1], 0, 0);
    }

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  /**
   * @tests java.io.FileDescriptor#FileDescriptor()
   */
  public void test_Constructor() {
    // Test for method java.io.FileDescriptor()
    FileDescriptor fd = new FileDescriptor();
    assertTrue("Failed to create FileDescriptor",
        fd instanceof FileDescriptor);
  }

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        f = new File(System.getProperty("user.dir"), "fd" + platformId + ".tst");
        f.delete();
        fos = new FileOutputStream(f.getPath());
        fos.write("Test String".getBytes());
        fis = new FileInputStream(f.getPath());
        FileDescriptor fd = fos.getFD();
        fd.sync();
        int length = "Test String".length();
        assertEquals("Bytes were not written after sync", length, fis
                .available());
        
        // Regression test for Harmony-1494
        fd = fis.getFD();
        fd.sync();
        assertEquals("Bytes were not written after sync", length, fis
                .available());
        
        RandomAccessFile raf = new RandomAccessFile(f, "r");
        fd = raf.getFD(); 
        fd.sync();
        raf.close();
  }

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    try {
      f = new File(System.getProperty("user.dir"), "fd.tst");
      f.delete();
      os = new BufferedOutputStream(fos = new FileOutputStream(f
          .getPath()), 4096);
      FileDescriptor fd = fos.getFD();
      assertTrue("Valid fd returned false", fd.valid());
      os.close();
      assertTrue("Invalid fd returned true", !fd.valid());
    } catch (Exception e) {
      fail("Exception during test : " + e.getMessage());
    }


  }

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     * @tests java.io.FileOutputStream#write(byte[], int, int)
     */
    public void test_write$BII3() throws Exception {
        // Regression for HARMONY-834
        //no exception expected
        new FileOutputStream(new FileDescriptor()).write(new byte[1], 0, 0);
    }

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

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    // Test for method java.io.SyncFailedException(java.lang.String)
    File f = null;
    try {
      f = new File(System.getProperty("user.dir"), "synfail.tst");
      FileOutputStream fos = new FileOutputStream(f.getPath());
      FileDescriptor fd = fos.getFD();
      fos.close();
      fd.sync();
    } catch (SyncFailedException e) {
      f.delete();
      return;
    } catch (Exception e) {
      fail("Exception during test : " + e.getMessage());

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 * @author Bob McWhirter
 */
public class UnsafeFs {


    public static FileDescriptor createFileDescriptor(int fd) throws IllegalAccessException, NoSuchFieldException {
        FileDescriptor fileDesc = new FileDescriptor();
        Field f = fileDesc.getClass().getDeclaredField("fd");
        f.setAccessible(true);
        f.setInt(fileDesc, fd );
        return fileDesc;
    }

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