mp_dir_name"><code class="code"><span class="constructor">Filename</span>.get_temp_dir_name</code></a>.
   The temporary file is created empty, with permissions <code class="code">0o600</code>
   (readable and writable only by the file owner).  The file is
   guaranteed to be different from any other file that existed when
   <code class="code">temp_file</code> was called.
   Raise <code class="code"><span class="constructor">Sys_error</span></code> if the file could not be created.<br>
<b>Before 3.11.2 </b