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82 lines
3.8 KiB
HTML
82 lines
3.8 KiB
HTML
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<?xml version="1.0" encoding="UTF-8" standalone="no"?>
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml">
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
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<title>Tcl API programming notes</title>
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<link rel="stylesheet" href="gettingStarted.css" type="text/css" />
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<meta name="generator" content="DocBook XSL Stylesheets V1.73.2" />
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<link rel="start" href="index.html" title="Berkeley DB Programmer's Reference Guide" />
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<link rel="up" href="tcl.html" title="Chapter 21. Berkeley DB Extensions: Tcl" />
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<link rel="prev" href="tcl_using.html" title="Using Berkeley DB with Tcl" />
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<link rel="next" href="tcl_error.html" title="Tcl error handling" />
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</head>
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<body>
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<div xmlns="" class="navheader">
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<div class="libver">
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<p>Library Version 11.2.5.2</p>
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</div>
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<table width="100%" summary="Navigation header">
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<tr>
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<th colspan="3" align="center">Tcl API programming notes</th>
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</tr>
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<tr>
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<td width="20%" align="left"><a accesskey="p" href="tcl_using.html">Prev</a> </td>
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<th width="60%" align="center">Chapter 21.
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Berkeley DB Extensions: Tcl
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</th>
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<td width="20%" align="right"> <a accesskey="n" href="tcl_error.html">Next</a></td>
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</tr>
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</table>
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<hr />
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</div>
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<div class="sect1" 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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<h2 class="title" style="clear: both"><a id="tcl_program"></a>Tcl API programming notes</h2>
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</div>
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</div>
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</div>
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<p>The Berkeley DB Tcl API does not attempt to avoid evaluating input as Tcl
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commands. For this reason, it may be dangerous to pass unreviewed user
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input through the Berkeley DB Tcl API, as the input may subsequently be
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evaluated as a Tcl command. Additionally, the Berkeley DB Tcl API
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initialization routine resets process' effective user and group IDs to
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the real user and group IDs, to minimize the effectiveness of a Tcl
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injection attack.</p>
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<p>The Tcl API closely parallels the Berkeley DB programmatic interfaces. If you
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are already familiar with one of those interfaces, there will not be many
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surprises in the Tcl API.</p>
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<p>The Tcl API currently does not support multithreading although
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it could be made to do so. The Tcl shell itself is
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not multithreaded and the Berkeley DB extensions use global data unprotected
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from multiple threads.</p>
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<p>Several pieces of Berkeley DB functionality are not available in the Tcl API.
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Any of the functions that require a user-provided function are not
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supported via the Tcl API. For example, there is no equivalent to the
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<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.
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Additionally, the heap access method is not available.</p>
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</div>
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<div class="navfooter">
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<hr />
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<table width="100%" summary="Navigation footer">
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<tr>
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<td width="40%" align="left"><a accesskey="p" href="tcl_using.html">Prev</a> </td>
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<td width="20%" align="center">
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<a accesskey="u" href="tcl.html">Up</a>
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</td>
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<td width="40%" align="right"> <a accesskey="n" href="tcl_error.html">Next</a></td>
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</tr>
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<tr>
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<td width="40%" align="left" valign="top">Using Berkeley DB with Tcl </td>
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<td width="20%" align="center">
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<a accesskey="h" href="index.html">Home</a>
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</td>
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<td width="40%" align="right" valign="top"> Tcl error handling</td>
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</tr>
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</table>
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</div>
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</body>
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</html>
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