1<!--$Id: set_func_exists.so,v 10.18 2004/08/13 03:39:02 bostic Exp $--> 2<!--Copyright (c) 1997,2008 Oracle. All rights reserved.--> 3<!--See the file LICENSE for redistribution information.--> 4<html> 5<head> 6<title>Berkeley DB: db_env_set_func_exists</title> 7<meta name="description" content="Berkeley DB: An embedded database programmatic toolkit."> 8<meta name="keywords" content="embedded,database,programmatic,toolkit,btree,hash,hashing,transaction,transactions,locking,logging,access method,access methods,Java,C,C++"> 9</head> 10<body bgcolor=white> 11<table width="100%"><tr valign=top> 12<td> 13<b>db_env_set_func_exists</b> 14</td> 15<td align=right> 16<a href="/api_c/api_core.html"><img src="/images/api.gif" alt="API"></a> 17<a href="/ref/toc.html"><img src="/images/ref.gif" alt="Ref"></a></td> 18</tr></table> 19<hr size=1 noshade> 20<tt> 21<b><pre> 22#include <db.h> 23<p> 24int 25db_env_set_func_exists(int (*func_exists)(const char *path, int *isdirp)); 26</pre></b> 27<hr size=1 noshade> 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> 53</tt> 54<table width="100%"><tr><td><br></td><td align=right> 55<a href="/api_c/api_core.html"><img src="/images/api.gif" alt="API"></a><a href="/ref/toc.html"><img src="/images/ref.gif" alt="Ref"></a> 56</td></tr></table> 57<p><font size=1>Copyright (c) 1996,2008 Oracle. All rights reserved.</font> 58</body> 59</html> 60