##
20.1.1 File Operations

`locking` (fd, mode, nbytes)
  Lock part of a file based on a file descriptor from the C runtime. Raises `IOError` on failure.

`setmode` (fd, flags)
  Set the line-end translation mode for the file descriptor fd. To set it to text mode, flags should be `os.O_TEXT`; for binary, it should be `os.O_BINARY`.

`open_osfhandle` (handle, flags)
  Create a C runtime file descriptor from the file handle handle. The flags parameter should be a bit-wise OR of `os.O_APPEND`, `os.O_RDONLY`, and `os.O_TEXT`. The returned file descriptor may be used as a parameter to `os.fdopen()` to create a file object.

`get_osfhandle` (fd)
  Return the file handle for the file descriptor fd. Raises `IOError` if fd is not recognized.