mirror of
https://github.com/yasuhirokimura/db18
synced 2026-06-08 18:29:23 +00:00
Yasuhiro KIMURA
91 lines
4.0 KiB
HTML
91 lines
4.0 KiB
HTML
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
|
||
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
|
||
<html xmlns="http://www.w3.org/1999/xhtml">
|
||
<head>
|
||
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
|
||
<title>Tcl API programming notes</title>
|
||
<link rel="stylesheet" href="gettingStarted.css" type="text/css" />
|
||
<meta name="generator" content="DocBook XSL Stylesheets V1.73.2" />
|
||
<link rel="start" href="index.html" title="Berkeley DB Programmer's Reference Guide" />
|
||
<link rel="up" href="tcl.html" title="Chapter 22. Berkeley DB Extensions: Tcl" />
|
||
<link rel="prev" href="tcl_using.html" title="Using Berkeley DB with Tcl" />
|
||
<link rel="next" href="tcl_error.html" title="Tcl error handling" />
|
||
</head>
|
||
<body>
|
||
<div xmlns="" class="navheader">
|
||
<div class="libver">
|
||
<p>Library Version 18.1.40</p>
|
||
</div>
|
||
<table width="100%" summary="Navigation header">
|
||
<tr>
|
||
<th colspan="3" align="center">Tcl API programming notes</th>
|
||
</tr>
|
||
<tr>
|
||
<td width="20%" align="left"><a accesskey="p" href="tcl_using.html">Prev</a> </td>
|
||
<th width="60%" align="center">Chapter 22. Berkeley DB Extensions: Tcl </th>
|
||
<td width="20%" align="right"> <a accesskey="n" href="tcl_error.html">Next</a></td>
|
||
</tr>
|
||
</table>
|
||
<hr />
|
||
</div>
|
||
<div class="sect1" lang="en" xml:lang="en">
|
||
<div class="titlepage">
|
||
<div>
|
||
<div>
|
||
<h2 class="title" style="clear: both"><a id="tcl_program"></a>Tcl API programming notes</h2>
|
||
</div>
|
||
</div>
|
||
</div>
|
||
<p>
|
||
The Berkeley DB Tcl API does not attempt to avoid evaluating
|
||
input as Tcl commands. For this reason, it may be dangerous to
|
||
pass unreviewed user input through the Berkeley DB Tcl API, as
|
||
the input may subsequently be evaluated as a Tcl command.
|
||
Additionally, the Berkeley DB Tcl API initialization routine
|
||
resets process' effective user and group IDs to the real user
|
||
and group IDs, to minimize the effectiveness of a Tcl
|
||
injection attack.
|
||
</p>
|
||
<p>
|
||
The Tcl API closely parallels the Berkeley DB programmatic
|
||
interfaces. If you are already familiar with one of those
|
||
interfaces, there will not be many surprises in the Tcl
|
||
API.
|
||
</p>
|
||
<p>
|
||
The Tcl API currently does not support multithreading
|
||
although it could be made to do so. The Tcl shell itself is
|
||
not multithreaded and the Berkeley DB extensions use global
|
||
data unprotected from multiple threads.
|
||
</p>
|
||
<p>
|
||
Several pieces of Berkeley DB functionality are not
|
||
available in the Tcl API. Any of the functions that require a
|
||
user-provided function are not supported via the Tcl API. For
|
||
example, there is no equivalent to the <a href="../api_reference/C/dbset_dup_compare.html" class="olink">DB->set_dup_compare()</a> or
|
||
<a href="../api_reference/C/envset_errcall.html" class="olink">DB_ENV->set_errcall()</a> methods. Additionally, the heap access method
|
||
is not available.
|
||
</p>
|
||
</div>
|
||
<div class="navfooter">
|
||
<hr />
|
||
<table width="100%" summary="Navigation footer">
|
||
<tr>
|
||
<td width="40%" align="left"><a accesskey="p" href="tcl_using.html">Prev</a> </td>
|
||
<td width="20%" align="center">
|
||
<a accesskey="u" href="tcl.html">Up</a>
|
||
</td>
|
||
<td width="40%" align="right"> <a accesskey="n" href="tcl_error.html">Next</a></td>
|
||
</tr>
|
||
<tr>
|
||
<td width="40%" align="left" valign="top">Using Berkeley DB with Tcl </td>
|
||
<td width="20%" align="center">
|
||
<a accesskey="h" href="index.html">Home</a>
|
||
</td>
|
||
<td width="40%" align="right" valign="top"> Tcl error handling</td>
|
||
</tr>
|
||
</table>
|
||
</div>
|
||
</body>
|
||
</html>
|