2011-09-13 17:44:24 +00:00
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<title>db_env_set_func_exists</title>
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<p>Library Version 11.2.5.2</p>
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<th colspan="3" align="center">db_env_set_func_exists</th>
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</tr>
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<tr>
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<td width="20%" align="left"><a accesskey="p" href="db_env_set_func_dirlist.html">Prev</a> </td>
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<th width="60%" align="center">Appendix C.
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Berkeley DB Application Space Static Functions
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</th>
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<td width="20%" align="right"> <a accesskey="n" href="db_env_set_func_file_map.html">Next</a></td>
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<h2 class="title" style="clear: both"><a id="db_env_set_func_exists"></a>db_env_set_func_exists</h2>
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</div>
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<pre class="programlisting">#include <db.h>
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int
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db_env_set_func_exists(int (*func_exists)(const char *path,
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int *isdirp)); </pre>
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<p>
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The Berkeley DB library requires the ability to determine whether a
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file exists and whether it is a file of type directory.
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</p>
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<p>
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The <code class="function">db_env_set_func_exists()</code> function configures all operations performed
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by a process and all of its threads of control, not operations
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confined to a single database environment.
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</p>
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<p>
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Although the <code class="function">db_env_set_func_exists()</code> function may be called at any time
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during the life of the application, it should normally be called
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before making calls to the <a class="xref" href="envcreate.html" title="db_env_create">db_env_create</a> or
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<a class="xref" href="dbcreate.html" title="db_create">db_create</a> methods.
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</p>
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<p>
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The <code class="function">db_env_set_func_exists()</code> <span>
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function returns a non-zero error value on failure and 0 on success.
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</span>
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</p>
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<div class="sect2" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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2011-12-20 00:07:10 +00:00
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<h3 class="title"><a id="id3772857"></a>Parameters</h3>
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2011-09-13 17:44:24 +00:00
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</div>
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</div>
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</div>
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<div class="sect3" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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2011-12-20 00:07:10 +00:00
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<h4 class="title"><a id="id3772860"></a>func_exists</h4>
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2011-09-13 17:44:24 +00:00
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</div>
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</div>
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</div>
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<p>
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The <span class="bold"><strong>func_exists</strong></span> parameter is the
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function which returns if a file exists and if it is a file of type
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directory.
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</p>
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<p>
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The <span class="bold"><strong>path</strong></span> parameter to this function
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is the pathname of the file to be checked.
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</p>
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<p>
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If the <span class="bold"><strong>isdirp</strong></span> parameter is non-NULL,
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it must be set to non-0 if <span class="bold"><strong>path</strong></span> is a
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directory, and 0 if <span class="bold"><strong>path</strong></span> is not a
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directory.
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</p>
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<p>
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The <span class="bold"><strong>func_exists</strong></span> function must return
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the value of <span class="bold"><strong>errno</strong></span> on failure and 0
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on success.
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</p>
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</div>
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</div>
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<div class="sect2" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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2011-12-20 00:07:10 +00:00
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<h3 class="title"><a id="id3772787"></a>See Also</h3>
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2011-09-13 17:44:24 +00:00
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</div>
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</div>
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<p>
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<a href="../../programmer_reference/program_runtime.html" class="olink">Run-time configuration</a>
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</p>
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