How to use

lseek

method

in

libcore.io.Os

public long lseek(FileDescriptor fd, long offset, int whence) throws ErrnoException { return os.lseek(fd, offset, whence); }
public StructStat lstat(String path) throws ErrnoException { return os.lstat(path); }

/**
 * Gets the current position within this file. All reads and
 * writes take place at the current file pointer position.
 *
 * @return the current offset in bytes from the beginning of the file.
 *
 * @throws IOException
 *             if an error occurs while getting the file pointer of this
 *             file.
 */
public long getFilePointer() throws IOException {
  try {
    return Libcore.os.lseek(fd, 0L, SEEK_CUR);
  } catch (ErrnoException errnoException) {
    throw errnoException.rethrowAsIOException();
  }
}

  @Override
  public long skip(long byteCount) throws IOException {
    if (byteCount < 0) {
      throw new IOException("byteCount < 0: " + byteCount);
    }
    try {
      // Try lseek(2). That returns the new offset, but we'll throw an
      // exception if it couldn't perform exactly the seek we asked for.
      Libcore.os.lseek(fd, byteCount, SEEK_CUR);
      return byteCount;
    } catch (ErrnoException errnoException) {
      if (errnoException.errno == ESPIPE) {
        // You can't seek on a pipe, so fall back to the superclass' implementation.
        return super.skip(byteCount);
      }
      throw errnoException.rethrowAsIOException();
    }
  }
}

/**
 * Moves this file's file pointer to a new position, from where following
 * {@code read}, {@code write} or {@code skip} operations are done. The
 * position may be greater than the current length of the file, but the
 * file's length will only change if the moving of the pointer is followed
 * by a {@code write} operation.
 *
 * @param offset
 *            the new file pointer position.
 * @throws IOException
 *             if this file is closed, {@code pos < 0} or another I/O error
 *             occurs.
 */
public void seek(long offset) throws IOException {
  if (offset < 0) {
    throw new IOException("offset < 0: " + offset);
  }
  try {
    Libcore.os.lseek(fd, offset, SEEK_SET);
  } catch (ErrnoException errnoException) {
    throw errnoException.rethrowAsIOException();
  }
}

public FileChannel position(long newPosition) throws IOException {
  checkOpen();
  if (newPosition < 0) {
    throw new IllegalArgumentException("position: " + newPosition);
  }
  try {
    Libcore.os.lseek(fd, newPosition, SEEK_SET);
  } catch (ErrnoException errnoException) {
    throw errnoException.rethrowAsIOException();
  }
  return this;
}

public long position() throws IOException {
  checkOpen();
  try {
    return Libcore.os.lseek(fd, 0L, SEEK_CUR);
  } catch (ErrnoException errnoException) {
    throw errnoException.rethrowAsIOException();
  }
}

public long lseek(FileDescriptor fd, long offset, int whence) throws ErrnoException { return os.lseek(fd, offset, whence); }
public StructStat lstat(String path) throws ErrnoException { return os.lstat(path); }

public long lseek(FileDescriptor fd, long offset, int whence) throws ErrnoException { return os.lseek(fd, offset, whence); }
public StructStat lstat(String path) throws ErrnoException { return os.lstat(path); }

public FileChannel position(long newPosition) throws IOException {
  checkOpen();
  if (newPosition < 0) {
    throw new IllegalArgumentException("position: " + newPosition);
  }
  try {
    Libcore.os.lseek(fd, newPosition, SEEK_SET);
  } catch (ErrnoException errnoException) {
    throw errnoException.rethrowAsIOException();
  }
  return this;
}

public FileChannel position(long newPosition) throws IOException {
  checkOpen();
  if (newPosition < 0) {
    throw new IllegalArgumentException("position: " + newPosition);
  }
  try {
    Libcore.os.lseek(fd, newPosition, SEEK_SET);
  } catch (ErrnoException errnoException) {
    throw errnoException.rethrowAsIOException();
  }
  return this;
}

public FileChannel position(long newPosition) throws IOException {
  checkOpen();
  if (newPosition < 0) {
    throw new IllegalArgumentException("position: " + newPosition);
  }
  try {
    Libcore.os.lseek(fd, newPosition, SEEK_SET);
  } catch (ErrnoException errnoException) {
    throw errnoException.rethrowAsIOException();
  }
  return this;
}

public FileChannel position(long newPosition) throws IOException {
  checkOpen();
  if (newPosition < 0) {
    throw new IllegalArgumentException("position: " + newPosition);
  }
  try {
    Libcore.os.lseek(fd, newPosition, SEEK_SET);
  } catch (ErrnoException errnoException) {
    throw errnoException.rethrowAsIOException();
  }
  return this;
}

public FileChannel position(long newPosition) throws IOException {
  checkOpen();
  if (newPosition < 0) {
    throw new IllegalArgumentException("position: " + newPosition);
  }
  try {
    Libcore.os.lseek(fd, newPosition, SEEK_SET);
  } catch (ErrnoException errnoException) {
    throw errnoException.rethrowAsIOException();
  }
  return this;
}

public FileChannel position(long newPosition) throws IOException {
  checkOpen();
  if (newPosition < 0) {
    throw new IllegalArgumentException("position: " + newPosition);
  }
  try {
    Libcore.os.lseek(fd, newPosition, SEEK_SET);
  } catch (ErrnoException errnoException) {
    throw errnoException.rethrowAsIOException();
  }
  return this;
}

public long position() throws IOException {
  checkOpen();
  try {
    return Libcore.os.lseek(fd, 0L, SEEK_CUR);
  } catch (ErrnoException errnoException) {
    throw errnoException.rethrowAsIOException();
  }
}

public long position() throws IOException {
  checkOpen();
  try {
    return Libcore.os.lseek(fd, 0L, SEEK_CUR);
  } catch (ErrnoException errnoException) {
    throw errnoException.rethrowAsIOException();
  }
}

public long position() throws IOException {
  checkOpen();
  try {
    return Libcore.os.lseek(fd, 0L, SEEK_CUR);
  } catch (ErrnoException errnoException) {
    throw errnoException.rethrowAsIOException();
  }
}

public long position() throws IOException {
  checkOpen();
  try {
    return Libcore.os.lseek(fd, 0L, SEEK_CUR);
  } catch (ErrnoException errnoException) {
    throw errnoException.rethrowAsIOException();
  }
}

public long position() throws IOException {
  checkOpen();
  try {
    return Libcore.os.lseek(fd, 0L, SEEK_CUR);
  } catch (ErrnoException errnoException) {
    throw errnoException.rethrowAsIOException();
  }
}

public long position() throws IOException {
  checkOpen();
  try {
    return Libcore.os.lseek(fd, 0L, SEEK_CUR);
  } catch (ErrnoException errnoException) {
    throw errnoException.rethrowAsIOException();
  }
}