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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Logging</title>
<meta name="generator" content="DocBook XSL Stylesheets V1.76.1">
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<tr valign="middle">
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<th width="100%" align="center">Redland RDF Library Manual</th>
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<tr><td colspan="5" class="shortcuts">
<a href="#redland-log.synopsis" class="shortcut">Top</a>
                   | 
                  <a href="#redland-log.description" class="shortcut">Description</a>
</td></tr>
</table>
<div class="refentry">
<a name="redland-log"></a><div class="titlepage"></div>
<div class="refnamediv"><table width="100%"><tr>
<td valign="top">
<h2><span class="refentrytitle"><a name="redland-log.top_of_page"></a>Logging</span></h2>
<p>Logging — Message and error logging.</p>
</td>
<td valign="top" align="right"></td>
</tr></table></div>
<div class="refsynopsisdiv">
<a name="redland-log.synopsis"></a><h2>Synopsis</h2>
<pre class="synopsis"><span class="returnvalue">int</span>                 (<a class="link" href="redland-log.html#librdf-log-level-func" title="librdf_log_level_func ()">*librdf_log_level_func</a>)            (<em class="parameter"><code><span class="type">void</span> *user_data</code></em>,
                                                         <em class="parameter"><code>const <span class="type">char</span> *message</code></em>,
                                                         <em class="parameter"><code><span class="type">va_list</span> arguments</code></em>);
<span class="returnvalue">int</span>                 (<a class="link" href="redland-log.html#librdf-log-func" title="librdf_log_func ()">*librdf_log_func</a>)                  (<em class="parameter"><code><span class="type">void</span> *user_data</code></em>,
                                                         <em class="parameter"><code><span class="type">librdf_log_message</span> *message</code></em>);
enum                <a class="link" href="redland-log.html#librdf-log-level" title="enum librdf_log_level">librdf_log_level</a>;
enum                <a class="link" href="redland-log.html#librdf-log-facility" title="enum librdf_log_facility">librdf_log_facility</a>;
<span class="returnvalue">int</span>                 <a class="link" href="redland-log.html#librdf-log-message-code" title="librdf_log_message_code ()">librdf_log_message_code</a>             (<em class="parameter"><code><span class="type">librdf_log_message</span> *message</code></em>);
<a class="link" href="redland-log.html#librdf-log-level" title="enum librdf_log_level"><span class="returnvalue">librdf_log_level</span></a>    <a class="link" href="redland-log.html#librdf-log-message-level" title="librdf_log_message_level ()">librdf_log_message_level</a>            (<em class="parameter"><code><span class="type">librdf_log_message</span> *message</code></em>);
<a class="link" href="redland-log.html#librdf-log-facility" title="enum librdf_log_facility"><span class="returnvalue">librdf_log_facility</span></a> <a class="link" href="redland-log.html#librdf-log-message-facility" title="librdf_log_message_facility ()">librdf_log_message_facility</a>         (<em class="parameter"><code><span class="type">librdf_log_message</span> *message</code></em>);
const <span class="returnvalue">char</span> *        <a class="link" href="redland-log.html#librdf-log-message-message" title="librdf_log_message_message ()">librdf_log_message_message</a>          (<em class="parameter"><code><span class="type">librdf_log_message</span> *message</code></em>);
<span class="returnvalue">raptor_locator</span> *    <a class="link" href="redland-log.html#librdf-log-message-locator" title="librdf_log_message_locator ()">librdf_log_message_locator</a>          (<em class="parameter"><code><span class="type">librdf_log_message</span> *message</code></em>);
</pre>
</div>
<div class="refsect1">
<a name="redland-log.description"></a><h2>Description</h2>
<p>
Provides structured access to debug, information, warning and error
messages from the libraries.  Structured information is most often
used from errors such as parsing where file or URI and line numbers
can be returned via a <span class="type">raptor_locator</span> object pointer found by
<a class="link" href="redland-log.html#librdf-log-message-locator" title="librdf_log_message_locator ()"><code class="function">librdf_log_message_locator()</code></a> on the <span class="type">librdf_log_message</span>.
</p>
</div>
<div class="refsect1">
<a name="redland-log.details"></a><h2>Details</h2>
<div class="refsect2">
<a name="librdf-log-level-func"></a><h3>librdf_log_level_func ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>                 (*librdf_log_level_func)            (<em class="parameter"><code><span class="type">void</span> *user_data</code></em>,
                                                         <em class="parameter"><code>const <span class="type">char</span> *message</code></em>,
                                                         <em class="parameter"><code><span class="type">va_list</span> arguments</code></em>);</pre>
<p>
Handler for one log level, for the warning and error levels ONLY.
Used by <a class="link" href="redland-world.html#librdf-world-set-warning" title="librdf_world_set_warning ()"><span class="type">librdf_world_set_warning</span></a> and <a class="link" href="redland-world.html#librdf-world-set-error" title="librdf_world_set_error ()"><span class="type">librdf_world_set_error</span></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>user_data</code></em> :</span></p></td>
<td>User data pointer</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>message</code></em> :</span></p></td>
<td>Log message.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>arguments</code></em> :</span></p></td>
<td>Message arguments.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>non-zero to indicate log message has been handled</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="librdf-log-func"></a><h3>librdf_log_func ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>                 (*librdf_log_func)                  (<em class="parameter"><code><span class="type">void</span> *user_data</code></em>,
                                                         <em class="parameter"><code><span class="type">librdf_log_message</span> *message</code></em>);</pre>
<p>
Handler for all log levels.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>user_data</code></em> :</span></p></td>
<td>User data pointer</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>message</code></em> :</span></p></td>
<td>Log message structure pointer.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>non-zero to indicate log message has been handled</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="librdf-log-level"></a><h3>enum librdf_log_level</h3>
<pre class="programlisting">typedef enum {
  LIBRDF_LOG_NONE = 0,
  LIBRDF_LOG_DEBUG,
  LIBRDF_LOG_INFO,
  LIBRDF_LOG_WARN,
  LIBRDF_LOG_ERROR,
  LIBRDF_LOG_FATAL,
  LIBRDF_LOG_LAST=LIBRDF_LOG_FATAL
} librdf_log_level;
</pre>
<p>
Indicates the level of the log message.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><a name="LIBRDF-LOG-NONE:CAPS"></a><span class="term"><code class="literal">LIBRDF_LOG_NONE</code></span></p></td>
<td>No level
</td>
</tr>
<tr>
<td><p><a name="LIBRDF-LOG-DEBUG:CAPS"></a><span class="term"><code class="literal">LIBRDF_LOG_DEBUG</code></span></p></td>
<td>Debug.
</td>
</tr>
<tr>
<td><p><a name="LIBRDF-LOG-INFO:CAPS"></a><span class="term"><code class="literal">LIBRDF_LOG_INFO</code></span></p></td>
<td>Information.
</td>
</tr>
<tr>
<td><p><a name="LIBRDF-LOG-WARN:CAPS"></a><span class="term"><code class="literal">LIBRDF_LOG_WARN</code></span></p></td>
<td>Warning.
</td>
</tr>
<tr>
<td><p><a name="LIBRDF-LOG-ERROR:CAPS"></a><span class="term"><code class="literal">LIBRDF_LOG_ERROR</code></span></p></td>
<td>Recoverable error.  Program can continue.
</td>
</tr>
<tr>
<td><p><a name="LIBRDF-LOG-FATAL:CAPS"></a><span class="term"><code class="literal">LIBRDF_LOG_FATAL</code></span></p></td>
<td>Fatal error.  Program will abort if this is not caught.
</td>
</tr>
<tr>
<td><p><a name="LIBRDF-LOG-LAST:CAPS"></a><span class="term"><code class="literal">LIBRDF_LOG_LAST</code></span></p></td>
<td>Internal, never returned.
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="librdf-log-facility"></a><h3>enum librdf_log_facility</h3>
<pre class="programlisting">typedef enum {
  LIBRDF_FROM_NONE = 0,
  LIBRDF_FROM_CONCEPTS,
  LIBRDF_FROM_DIGEST,
  LIBRDF_FROM_FILES,
  LIBRDF_FROM_HASH,
  LIBRDF_FROM_INIT,
  LIBRDF_FROM_ITERATOR,
  LIBRDF_FROM_LIST,
  LIBRDF_FROM_MODEL,
  LIBRDF_FROM_NODE,
  LIBRDF_FROM_PARSER,
  LIBRDF_FROM_QUERY,
  LIBRDF_FROM_SERIALIZER,
  LIBRDF_FROM_STATEMENT,
  LIBRDF_FROM_STORAGE,
  LIBRDF_FROM_STREAM,
  LIBRDF_FROM_URI,
  LIBRDF_FROM_UTF8,
  LIBRDF_FROM_MEMORY,
  LIBRDF_FROM_RAPTOR,
  LIBRDF_FROM_LAST=LIBRDF_FROM_RAPTOR
} librdf_log_facility;
</pre>
<p>
Indicates the part of the system that generated the log message.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><a name="LIBRDF-FROM-NONE:CAPS"></a><span class="term"><code class="literal">LIBRDF_FROM_NONE</code></span></p></td>
<td>Associated with no part.
</td>
</tr>
<tr>
<td><p><a name="LIBRDF-FROM-CONCEPTS:CAPS"></a><span class="term"><code class="literal">LIBRDF_FROM_CONCEPTS</code></span></p></td>
<td>Concepts
</td>
</tr>
<tr>
<td><p><a name="LIBRDF-FROM-DIGEST:CAPS"></a><span class="term"><code class="literal">LIBRDF_FROM_DIGEST</code></span></p></td>
<td>Digest
</td>
</tr>
<tr>
<td><p><a name="LIBRDF-FROM-FILES:CAPS"></a><span class="term"><code class="literal">LIBRDF_FROM_FILES</code></span></p></td>
<td>Files
</td>
</tr>
<tr>
<td><p><a name="LIBRDF-FROM-HASH:CAPS"></a><span class="term"><code class="literal">LIBRDF_FROM_HASH</code></span></p></td>
<td>Hash
</td>
</tr>
<tr>
<td><p><a name="LIBRDF-FROM-INIT:CAPS"></a><span class="term"><code class="literal">LIBRDF_FROM_INIT</code></span></p></td>
<td>Init
</td>
</tr>
<tr>
<td><p><a name="LIBRDF-FROM-ITERATOR:CAPS"></a><span class="term"><code class="literal">LIBRDF_FROM_ITERATOR</code></span></p></td>
<td>Iterator
</td>
</tr>
<tr>
<td><p><a name="LIBRDF-FROM-LIST:CAPS"></a><span class="term"><code class="literal">LIBRDF_FROM_LIST</code></span></p></td>
<td>List
</td>
</tr>
<tr>
<td><p><a name="LIBRDF-FROM-MODEL:CAPS"></a><span class="term"><code class="literal">LIBRDF_FROM_MODEL</code></span></p></td>
<td>Model
</td>
</tr>
<tr>
<td><p><a name="LIBRDF-FROM-NODE:CAPS"></a><span class="term"><code class="literal">LIBRDF_FROM_NODE</code></span></p></td>
<td>Node
</td>
</tr>
<tr>
<td><p><a name="LIBRDF-FROM-PARSER:CAPS"></a><span class="term"><code class="literal">LIBRDF_FROM_PARSER</code></span></p></td>
<td>Parser
</td>
</tr>
<tr>
<td><p><a name="LIBRDF-FROM-QUERY:CAPS"></a><span class="term"><code class="literal">LIBRDF_FROM_QUERY</code></span></p></td>
<td>Query
</td>
</tr>
<tr>
<td><p><a name="LIBRDF-FROM-SERIALIZER:CAPS"></a><span class="term"><code class="literal">LIBRDF_FROM_SERIALIZER</code></span></p></td>
<td>Serializer
</td>
</tr>
<tr>
<td><p><a name="LIBRDF-FROM-STATEMENT:CAPS"></a><span class="term"><code class="literal">LIBRDF_FROM_STATEMENT</code></span></p></td>
<td>Statement
</td>
</tr>
<tr>
<td><p><a name="LIBRDF-FROM-STORAGE:CAPS"></a><span class="term"><code class="literal">LIBRDF_FROM_STORAGE</code></span></p></td>
<td>Storage
</td>
</tr>
<tr>
<td><p><a name="LIBRDF-FROM-STREAM:CAPS"></a><span class="term"><code class="literal">LIBRDF_FROM_STREAM</code></span></p></td>
<td>Stream
</td>
</tr>
<tr>
<td><p><a name="LIBRDF-FROM-URI:CAPS"></a><span class="term"><code class="literal">LIBRDF_FROM_URI</code></span></p></td>
<td>URI
</td>
</tr>
<tr>
<td><p><a name="LIBRDF-FROM-UTF8:CAPS"></a><span class="term"><code class="literal">LIBRDF_FROM_UTF8</code></span></p></td>
<td>UTF8
</td>
</tr>
<tr>
<td><p><a name="LIBRDF-FROM-MEMORY:CAPS"></a><span class="term"><code class="literal">LIBRDF_FROM_MEMORY</code></span></p></td>
<td>Memory
</td>
</tr>
<tr>
<td><p><a name="LIBRDF-FROM-RAPTOR:CAPS"></a><span class="term"><code class="literal">LIBRDF_FROM_RAPTOR</code></span></p></td>
<td>Raptor library (parser or serializer; Raptor 2.0.0+).
</td>
</tr>
<tr>
<td><p><a name="LIBRDF-FROM-LAST:CAPS"></a><span class="term"><code class="literal">LIBRDF_FROM_LAST</code></span></p></td>
<td>Internal, never returned.
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="librdf-log-message-code"></a><h3>librdf_log_message_code ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>                 librdf_log_message_code             (<em class="parameter"><code><span class="type">librdf_log_message</span> *message</code></em>);</pre>
<p>
Retrieve error code from log message.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>message</code></em> :</span></p></td>
<td>log message</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>int error code</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="librdf-log-message-level"></a><h3>librdf_log_message_level ()</h3>
<pre class="programlisting"><a class="link" href="redland-log.html#librdf-log-level" title="enum librdf_log_level"><span class="returnvalue">librdf_log_level</span></a>    librdf_log_message_level            (<em class="parameter"><code><span class="type">librdf_log_message</span> *message</code></em>);</pre>
<p>
Retrieve severity of log message.
</p>
<p>
The log message severity level is defined in rdf_log.h as values
of enum <a class="link" href="redland-log.html#librdf-log-level" title="enum librdf_log_level"><span class="type">librdf_log_level</span></a>
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>message</code></em> :</span></p></td>
<td>log message</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>severity level</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="librdf-log-message-facility"></a><h3>librdf_log_message_facility ()</h3>
<pre class="programlisting"><a class="link" href="redland-log.html#librdf-log-facility" title="enum librdf_log_facility"><span class="returnvalue">librdf_log_facility</span></a> librdf_log_message_facility         (<em class="parameter"><code><span class="type">librdf_log_message</span> *message</code></em>);</pre>
<p>
Retrieve facility that generated the message.
</p>
<p>
The log message facility is defined in rdf_log.h as values
of enum <a class="link" href="redland-log.html#librdf-log-facility" title="enum librdf_log_facility"><span class="type">librdf_log_facility</span></a>
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>message</code></em> :</span></p></td>
<td>log message</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>ID of Redland facility that generated the log message.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="librdf-log-message-message"></a><h3>librdf_log_message_message ()</h3>
<pre class="programlisting">const <span class="returnvalue">char</span> *        librdf_log_message_message          (<em class="parameter"><code><span class="type">librdf_log_message</span> *message</code></em>);</pre>
<p>
Retrieve text message from log entry.
</p>
<p>
The string returned is shared and must be copied by the caller
if required to be retained.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>message</code></em> :</span></p></td>
<td>log message</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>shared pointer to the log message string</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="librdf-log-message-locator"></a><h3>librdf_log_message_locator ()</h3>
<pre class="programlisting"><span class="returnvalue">raptor_locator</span> *    librdf_log_message_locator          (<em class="parameter"><code><span class="type">librdf_log_message</span> *message</code></em>);</pre>
<p>
Retrieve locator of log entry.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>message</code></em> :</span></p></td>
<td>log message</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>pointer to an appropriate raptor_locator* or NULL if not available</td>
</tr>
</tbody>
</table></div>
</div>
</div>
</div>
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