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<H2><A NAME="SECTION0020110000000000000000"></A>
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18.1.1 File Operations 
</H2>

<P>
<dl><dt><b><a name="l2h-2547"><tt class=function>locking</tt></a></b> (<var>fd, mode, nbytes</var>)
<dd>
  Lock part of a file based on a file descriptor from the C runtime.
  Raises <tt class=exception>IOError</tt> on failure.
</dl>

<P>
<dl><dt><b><a name="l2h-2548"><tt class=function>setmode</tt></a></b> (<var>fd, flags</var>)
<dd>
  Set the line-end translation mode for the file descriptor <var>fd</var>.
  To set it to text mode, <var>flags</var> should be <tt class=constant>os.O_TEXT</tt>;
  for binary, it should be <tt class=constant>os.O_BINARY</tt>.
</dl>

<P>
<dl><dt><b><a name="l2h-2549"><tt class=function>open_osfhandle</tt></a></b> (<var>handle, flags</var>)
<dd>
  Create a C runtime file descriptor from the file handle
  <var>handle</var>.  The <var>flags</var> parameter should be a bit-wise OR of
  <tt class=constant>os.O_APPEND</tt>, <tt class=constant>os.O_RDONLY</tt>, and
  <tt class=constant>os.O_TEXT</tt>.  The returned file descriptor may be used as a
  parameter to <tt class=function>os.fdopen()</tt> to create a file object.
</dl>

<P>
<dl><dt><b><a name="l2h-2550"><tt class=function>get_osfhandle</tt></a></b> (<var>fd</var>)
<dd>
  Return the file handle for the file descriptor <var>fd</var>.  Raises
  <tt class=exception>IOError</tt> if <var>fd</var> is not recognized.
</dl>

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