1<?xml version="1.0" encoding="UTF-8" standalone="no"?> 2<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 3<html xmlns="http://www.w3.org/1999/xhtml"> 4 <head> 5 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /> 6 <title>db_env_set_func_exists</title> 7 <link rel="stylesheet" href="apiReference.css" type="text/css" /> 8 <meta name="generator" content="DocBook XSL Stylesheets V1.73.2" /> 9 <link rel="start" href="index.html" title="Berkeley DB C API Reference" /> 10 <link rel="up" href="setfunc.html" title="Appendix 3. Berkeley DB Application Space Static Functions" /> 11 <link rel="prev" href="db_env_set_func_dirlist.html" title="db_env_set_func_dirlist" /> 12 <link rel="next" href="db_env_set_func_file_map.html" title="db_env_set_func_file_map" /> 13 </head> 14 <body> 15 <div class="navheader"> 16 <table width="100%" summary="Navigation header"> 17 <tr> 18 <th colspan="3" align="center">db_env_set_func_exists</th> 19 </tr> 20 <tr> 21 <td width="20%" align="left"><a accesskey="p" href="db_env_set_func_dirlist.html">Prev</a> </td> 22 <th width="60%" align="center">Appendix 3. 23 Berkeley DB Application Space Static Functions 24 </th> 25 <td width="20%" align="right"> <a accesskey="n" href="db_env_set_func_file_map.html">Next</a></td> 26 </tr> 27 </table> 28 <hr /> 29 </div> 30 <div class="sect1" lang="en" xml:lang="en"> 31 <div class="titlepage"> 32 <div> 33 <div> 34 <h2 class="title" style="clear: both"><a id="db_env_set_func_exists"></a>db_env_set_func_exists</h2> 35 </div> 36 </div> 37 </div> 38 <pre class="programlisting">#include <db.h> 39 40int 41db_env_set_func_exists(int (*func_exists)(const char *path, int *isdirp)); </pre> 42 <p> 43 The Berkeley DB library requires the ability to determine whether a 44 file exists and whether it is a file of type directory. 45 </p> 46 <p> 47 The <code class="function">db_env_set_func_exists()</code> function configures all operations performed 48 by a process and all of its threads of control, not operations 49 confined to a single database environment. 50 </p> 51 <p> 52 Although the <code class="function">db_env_set_func_exists()</code> function may be called at any time 53 during the life of the application, it should normally be called 54 before making calls to the <a class="xref" href="envcreate.html" title="db_env_create">db_env_create</a> or 55 <a class="xref" href="dbcreate.html" title="db_create">db_create</a> methods. 56 </p> 57 <p> 58 The <code class="function">db_env_set_func_exists()</code> <span> 59 function returns a non-zero error value on failure and 0 on success. 60 </span> 61 </p> 62 <div class="sect2" lang="en" xml:lang="en"> 63 <div class="titlepage"> 64 <div> 65 <div> 66 <h3 class="title"><a id="id1718329"></a>Parameters</h3> 67 </div> 68 </div> 69 </div> 70 <div class="sect3" lang="en" xml:lang="en"> 71 <div class="titlepage"> 72 <div> 73 <div> 74 <h4 class="title"><a id="id1718708"></a>func_exists</h4> 75 </div> 76 </div> 77 </div> 78 <p> 79 The <span class="bold"><strong>func_exists</strong></span> parameter is the 80 function which returns if a file exists and if it is a file of type 81 directory. 82 </p> 83 <p> 84 The <span class="bold"><strong>path</strong></span> parameter to this function 85 is the pathname of the file to be checked. 86 </p> 87 <p> 88 If the <span class="bold"><strong>isdirp</strong></span> parameter is non-NULL, 89 it must be set to non-0 if <span class="bold"><strong>path</strong></span> is a 90 directory, and 0 if <span class="bold"><strong>path</strong></span> is not a 91 directory. 92 </p> 93 <p> 94 The <span class="bold"><strong>func_exists</strong></span> function must return 95 the value of <span class="bold"><strong>errno</strong></span> on failure and 0 96 on success. 97 </p> 98 </div> 99 </div> 100 <div class="sect2" lang="en" xml:lang="en"> 101 <div class="titlepage"> 102 <div> 103 <div> 104 <h3 class="title"><a id="id1719019"></a>See Also</h3> 105 </div> 106 </div> 107 </div> 108 <p> 109 <a href="../../programmer_reference/program_runtime.html" class="olink">Run-time configuration</a> 110 111 </p> 112 </div> 113 </div> 114 <div class="navfooter"> 115 <hr /> 116 <table width="100%" summary="Navigation footer"> 117 <tr> 118 <td width="40%" align="left"><a accesskey="p" href="db_env_set_func_dirlist.html">Prev</a> </td> 119 <td width="20%" align="center"> 120 <a accesskey="u" href="setfunc.html">Up</a> 121 </td> 122 <td width="40%" align="right"> <a accesskey="n" href="db_env_set_func_file_map.html">Next</a></td> 123 </tr> 124 <tr> 125 <td width="40%" align="left" valign="top">db_env_set_func_dirlist </td> 126 <td width="20%" align="center"> 127 <a accesskey="h" href="index.html">Home</a> 128 </td> 129 <td width="40%" align="right" valign="top"> db_env_set_func_file_map</td> 130 </tr> 131 </table> 132 </div> 133 </body> 134</html> 135