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Import BSDDB 4.7.25 (as of svn r89086)

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Zachary Ware
2017-09-04 13:40:25 -05:00
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<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<title>Error Returns</title>
<link rel="stylesheet" href="gettingStarted.css" type="text/css" />
<meta name="generator" content="DocBook XSL Stylesheets V1.62.4" />
<link rel="home" href="index.html" title="Getting Started with Berkeley DB" />
<link rel="up" href="introduction.html" title="Chapter 1. Introduction to Berkeley DB " />
<link rel="previous" href="coreExceptions.html" title="Exception Handling" />
<link rel="next" href="gettingit.html" title="Getting and Using DB " />
</head>
<body>
<div class="navheader">
<table width="100%" summary="Navigation header">
<tr>
<th colspan="3" align="center">Error Returns</th>
</tr>
<tr>
<td width="20%" align="left"><a accesskey="p" href="coreExceptions.html">Prev</a> </td>
<th width="60%" align="center">Chapter 1. Introduction to Berkeley DB </th>
<td width="20%" align="right"> <a accesskey="n" href="gettingit.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="returns"></a>Error Returns</h2>
</div>
</div>
<div></div>
</div>
<p>
<span>In addition to exceptions, the</span>
DB interfaces always return a value of 0 on success. If the
operation does not succeed for any reason, the return value will be
non-zero.
</p>
<p>
If a system error occurred (for example, DB ran out of disk
space, or permission to access a file was denied, or an illegal argument
was specified to one of the interfaces), DB returns an
<tt class="literal">errno</tt>
value. All of the possible values of <tt class="literal">errno</tt> are greater than 0.
</p>
<p>
If the operation did not fail due to a system error, but was not
successful either, DB returns a special error value. For
example, if you tried to retrieve data from the database and the
record for which you are searching does not exist, DB would return
<tt class="literal">DB_NOTFOUND</tt>, a special error value that means the requested
key does not appear in the database. All of the possible special error
values are less than 0.
</p>
</div>
<div class="navfooter">
<hr />
<table width="100%" summary="Navigation footer">
<tr>
<td width="40%" align="left"><a accesskey="p" href="coreExceptions.html">Prev</a> </td>
<td width="20%" align="center">
<a accesskey="u" href="introduction.html">Up</a>
</td>
<td width="40%" align="right"> <a accesskey="n" href="gettingit.html">Next</a></td>
</tr>
<tr>
<td width="40%" align="left" valign="top">Exception Handling </td>
<td width="20%" align="center">
<a accesskey="h" href="index.html">Home</a>
</td>
<td width="40%" align="right" valign="top"> Getting and Using DB </td>
</tr>
</table>
</div>
</body>
</html>