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13<b>db_env_set_func_exists</b>
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21<b><pre>
22#include &lt;db.h&gt;
23<p>
24int
25db_env_set_func_exists(int (*func_exists)(const char *path, int *isdirp));
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28<b>Description: db_env_set_func_exists</b>
29<p>The Berkeley DB library requires the ability to determine whether a file
30exists and whether it is a file of type directory.</p>
31<p>The db_env_set_func_exists method configures all operations performed by a process and
32all of its threads of control, not operations confined to a single
33database environment.</p>
34<p>Although the db_env_set_func_exists method may be called at any time during the life of
35the application, it should normally be called before making calls to the
36<a href="/api_c/env_class.html">db_env_create</a> or <a href="/api_c/db_class.html">db_create</a> methods.</p>
37<p>The db_env_set_func_exists method
38returns a non-zero error value on failure
39and 0 on success.
40</p>
41<b>Parameters</b> <br>
42 <b>func_exists</b><ul compact><li>The <b>func_exists</b> parameter is the function which returns if a
43file exists and if it is a file of type directory.
44<p>The <b>path</b> parameter to this function is the pathname of the file
45to be checked.</p>
46<p>If the <b>isdirp</b> parameter is non-NULL, it must be set to non-0 if
47<b>path</b> is a directory, and 0 if <b>path</b> is not a directory.</p>
48<p>The <b>func_exists</b> function must return the value of <b>errno</b> on
49failure and 0 on success.</p></ul>
50<br>
51<br><b>See Also</b>
52<a href="/ref/program/runtime.html">Run-time configuration</a>
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