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<!--$Id: set_func_exists.so,v 10.18 2004/08/13 03:39:02 bostic Exp $-->
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<h3>db_env_set_func_exists</h3>
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<h3><pre>
#include <db.h>
<p>
int
db_env_set_func_exists(int (*func_exists)(const char *path, int *isdirp));
</pre></h3>
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<h3>Description: db_env_set_func_exists</h3>
<p>The Berkeley DB library requires the ability to determine whether a file
exists and whether it is a file of type directory.</p>
<p>The db_env_set_func_exists method configures all operations performed by a process and
all of its threads of control, not operations confined to a single
database environment.</p>
<p>Although the db_env_set_func_exists method may be called at any time during the life of
the application, it should normally be called before making calls to the
<a href="../api_c/env_class.html">db_env_create</a> or <a href="../api_c/db_class.html">db_create</a> methods.</p>
<p>The db_env_set_func_exists method
returns a non-zero error value on failure
and 0 on success.
</p>
<h3>Parameters</h3>
<dl compact>
<dt><b>func_exists</b><dd>The <b>func_exists</b> parameter is the function which returns if a
file exists and if it is a file of type directory.
<p>The <b>path</b> parameter to this function is the pathname of the file
to be checked.</p>
<p>If the <b>isdirp</b> parameter is non-NULL, it must be set to non-0 if
<b>path</b> is a directory, and 0 if <b>path</b> is not a directory.</p>
<p>The <b>func_exists</b> function must return the value of <b>errno</b> on
failure and 0 on success.</p>
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<h3>See Also</h3>
<a href="../ref/program/runtime.html">Run-time configuration</a>
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