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<a name="Libvirt-glib-Error-reporting"></a><div class="titlepage"></div>
<div class="refnamediv"><table width="100%"><tr>
<td valign="top">
<h2><span class="refentrytitle"><a name="Libvirt-glib-Error-reporting.top_of_page"></a>Error reporting</span></h2>
<p>Error reporting — Convert libvirt error reports to GLib error reports</p>
</td>
<td class="gallery_image" valign="top" align="right"></td>
</tr></table></div>
<div class="refsect1">
<a name="Libvirt-glib-Error-reporting.stability-level"></a><h2>Stability Level</h2>
<acronym title="The intention of a Stable interface is to enable arbitrary third parties to
develop applications to these interfaces, release them, and have confidence that
they will run on all minor releases of the product (after the one in which the
interface was introduced, and within the same major release). Even at a major
release, incompatible changes are expected to be rare, and to have strong
justifications.
"><span class="acronym">Stable</span></acronym>, unless otherwise indicated
</div>
<div class="refsect1">
<a name="Libvirt-glib-Error-reporting.functions"></a><h2>Functions</h2>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="functions_return">
<col class="functions_name">
</colgroup>
<tbody>
<tr>
<td class="function_type">
<a href="https://developer.gnome.org/glib/unstable/glib-Error-Reporting.html#GError"><span class="returnvalue">GError</span></a> *
</td>
<td class="function_name">
<a class="link" href="Libvirt-glib-Error-reporting.html#gvir-error-new" title="gvir_error_new ()">gvir_error_new</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="https://developer.gnome.org/glib/unstable/glib-Error-Reporting.html#GError"><span class="returnvalue">GError</span></a> *
</td>
<td class="function_name">
<a class="link" href="Libvirt-glib-Error-reporting.html#gvir-error-new-literal" title="gvir_error_new_literal ()">gvir_error_new_literal</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="https://developer.gnome.org/glib/unstable/glib-Error-Reporting.html#GError"><span class="returnvalue">GError</span></a> *
</td>
<td class="function_name">
<a class="link" href="Libvirt-glib-Error-reporting.html#gvir-error-new-valist" title="gvir_error_new_valist ()">gvir_error_new_valist</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="Libvirt-glib-Error-reporting.html#gvir-set-error" title="gvir_set_error ()">gvir_set_error</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="Libvirt-glib-Error-reporting.html#gvir-set-error-literal" title="gvir_set_error_literal ()">gvir_set_error_literal</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="Libvirt-glib-Error-reporting.html#gvir-set-error-valist" title="gvir_set_error_valist ()">gvir_set_error_valist</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="Libvirt-glib-Error-reporting.html#gvir-critical" title="gvir_critical ()">gvir_critical</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="Libvirt-glib-Error-reporting.html#gvir-warning" title="gvir_warning ()">gvir_warning</a> <span class="c_punctuation">()</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="Libvirt-glib-Error-reporting.includes"></a><h2>Includes</h2>
<pre class="synopsis">#include <libvirt-glib/libvirt-glib.h>
</pre>
</div>
<div class="refsect1">
<a name="Libvirt-glib-Error-reporting.description"></a><h2>Description</h2>
<p>The libvirt API uses the <code class="code">virError</code> structure for reporting
errors back to the application programmer. The libvirt API errors are
provided in thread-local variables, while the GLib standard practice is
to return errors via out parameters. This library provides a simple way
to fill in <code class="code">GError **</code> output parameters with the contents
of the most recent libvirt error object in the current thread.</p>
<p>The <code class="code">gvir_error_new</code>, <code class="code">gvir_error_new_literal</code> and</p>
<code class="code">gvir_error_new_valist</code> methods all return a newly created
<code class="code">GError *</code> object instance, differing only in the way the
<p>message needs to be provided. For most usage though, it is preferrable
to use the <code class="code">gvir_set_error</code>, <code class="code">gvir_set_error_literal</code>
and <code class="code">gvir_set_error_valist</code> methods. These all accept a</p>
<code class="code">GError **</code> argument and take care to only fill it if it
<p>points to a non-NULL location.</p>
<div class="example">
<a name="id-1.2.3.6.9"></a><p class="title"><b>Example 2. Reporting GLib errors with libvirt APIs</b></p>
<div class="example-contents">
<table class="listing_frame" border="0" cellpadding="0" cellspacing="0">
<tbody>
<tr>
<td class="listing_lines" align="right"><pre>1
2
3
4
5
6
7
8
9</pre></td>
<td class="listing_code"><pre class="programlisting"><span class="usertype">gboolean</span><span class="normal"> </span><span class="function">myapp_start_guest</span><span class="symbol">(</span><span class="keyword">const</span><span class="normal"> </span><span class="usertype">gchar</span><span class="normal"> </span><span class="symbol">*</span><span class="normal">xml</span><span class="symbol">,</span><span class="normal"> </span><span class="usertype">GError</span><span class="normal"> </span><span class="symbol">**</span><span class="normal">error</span><span class="symbol">)</span>
<span class="cbracket">{</span>
<span class="normal"> </span><span class="keyword">if</span><span class="normal"> </span><span class="symbol">(</span><span class="function">virDomainCreate</span><span class="symbol">(</span><span class="normal">conn</span><span class="symbol">,</span><span class="normal"> xml</span><span class="symbol">,</span><span class="normal"> </span><span class="number">0</span><span class="symbol">)</span><span class="normal"> </span><span class="symbol"><</span><span class="normal"> </span><span class="number">0</span><span class="symbol">)</span><span class="normal"> </span><span class="cbracket">{</span>
<span class="normal"> </span><span class="function"><a href="Libvirt-glib-Error-reporting.html#gvir-set-error-literal">gvir_set_error_literal</a></span><span class="symbol">(</span><span class="normal">error</span><span class="symbol">,</span><span class="normal"> </span><span class="string">"Unable to start virtual machine"</span><span class="symbol">);</span>
<span class="normal"> </span><span class="keyword">return</span><span class="normal"> <a href="https://developer.gnome.org/glib/unstable/glib-Standard-Macros.html#FALSE:CAPS">FALSE</a></span><span class="symbol">;</span>
<span class="normal"> </span><span class="cbracket">}</span>
<span class="normal"> </span><span class="keyword">return</span><span class="normal"> <a href="https://developer.gnome.org/glib/unstable/glib-Standard-Macros.html#TRUE:CAPS">TRUE</a></span><span class="symbol">;</span>
<span class="cbracket">}</span></pre></td>
</tr>
</tbody>
</table>
</div>
</div>
<br class="example-break">
</div>
<div class="refsect1">
<a name="Libvirt-glib-Error-reporting.functions_details"></a><h2>Functions</h2>
<div class="refsect2">
<a name="gvir-error-new"></a><h3>gvir_error_new ()</h3>
<pre class="programlisting"><a href="https://developer.gnome.org/glib/unstable/glib-Error-Reporting.html#GError"><span class="returnvalue">GError</span></a> *
gvir_error_new (<em class="parameter"><code><a href="https://developer.gnome.org/glib/unstable/glib-Quarks.html#GQuark"><span class="type">GQuark</span></a> domain</code></em>,
<em class="parameter"><code><a href="https://developer.gnome.org/glib/unstable/glib-Basic-Types.html#gint"><span class="type">gint</span></a> code</code></em>,
<em class="parameter"><code>const <a href="https://developer.gnome.org/glib/unstable/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *format</code></em>,
<em class="parameter"><code>...</code></em>);</pre>
<p>Creates a new <a href="https://developer.gnome.org/glib/unstable/glib-Error-Reporting.html#GError"><span class="type">GError</span></a> with the given <em class="parameter"><code>domain</code></em>
and <em class="parameter"><code>code</code></em>
,
and a message formatted with <em class="parameter"><code>format</code></em>
.</p>
<div class="refsect3">
<a name="id-1.2.3.7.2.5"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>domain</p></td>
<td class="parameter_description"><p>error domain</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>code</p></td>
<td class="parameter_description"><p>error code</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>format</p></td>
<td class="parameter_description"><p>printf()-style format for error message</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>...</p></td>
<td class="parameter_description"><p>parameters for message format</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.2.3.7.2.6"></a><h4>Returns</h4>
<p> a new <a href="https://developer.gnome.org/glib/unstable/glib-Error-Reporting.html#GError"><span class="type">GError</span></a></p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gvir-error-new-literal"></a><h3>gvir_error_new_literal ()</h3>
<pre class="programlisting"><a href="https://developer.gnome.org/glib/unstable/glib-Error-Reporting.html#GError"><span class="returnvalue">GError</span></a> *
gvir_error_new_literal (<em class="parameter"><code><a href="https://developer.gnome.org/glib/unstable/glib-Quarks.html#GQuark"><span class="type">GQuark</span></a> domain</code></em>,
<em class="parameter"><code><a href="https://developer.gnome.org/glib/unstable/glib-Basic-Types.html#gint"><span class="type">gint</span></a> code</code></em>,
<em class="parameter"><code>const <a href="https://developer.gnome.org/glib/unstable/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *message</code></em>);</pre>
<p>Creates a new <a href="https://developer.gnome.org/glib/unstable/glib-Error-Reporting.html#GError"><span class="type">GError</span></a>; unlike <a class="link" href="Libvirt-glib-Error-reporting.html#gvir-error-new" title="gvir_error_new ()"><code class="function">gvir_error_new()</code></a>, <em class="parameter"><code>message</code></em>
is
not a <code class="function">printf()</code>-style format string. Use this function if
<em class="parameter"><code>message</code></em>
contains text you don't have control over,
that could include <code class="function">printf()</code> escape sequences.</p>
<div class="refsect3">
<a name="id-1.2.3.7.3.5"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>domain</p></td>
<td class="parameter_description"><p>error domain</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>code</p></td>
<td class="parameter_description"><p>error code</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>message</p></td>
<td class="parameter_description"><p>error message</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.2.3.7.3.6"></a><h4>Returns</h4>
<p> a new <a href="https://developer.gnome.org/glib/unstable/glib-Error-Reporting.html#GError"><span class="type">GError</span></a></p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gvir-error-new-valist"></a><h3>gvir_error_new_valist ()</h3>
<pre class="programlisting"><a href="https://developer.gnome.org/glib/unstable/glib-Error-Reporting.html#GError"><span class="returnvalue">GError</span></a> *
gvir_error_new_valist (<em class="parameter"><code><a href="https://developer.gnome.org/glib/unstable/glib-Quarks.html#GQuark"><span class="type">GQuark</span></a> domain</code></em>,
<em class="parameter"><code><a href="https://developer.gnome.org/glib/unstable/glib-Basic-Types.html#gint"><span class="type">gint</span></a> code</code></em>,
<em class="parameter"><code>const <a href="https://developer.gnome.org/glib/unstable/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *format</code></em>,
<em class="parameter"><code><span class="type">va_list</span> args</code></em>);</pre>
<p>Creates a new <a href="https://developer.gnome.org/glib/unstable/glib-Error-Reporting.html#GError"><span class="type">GError</span></a> with the given <em class="parameter"><code>domain</code></em>
and <em class="parameter"><code>code</code></em>
,
and a message formatted with <em class="parameter"><code>format</code></em>
.</p>
<div class="refsect3">
<a name="id-1.2.3.7.4.5"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>domain</p></td>
<td class="parameter_description"><p>error domain</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>code</p></td>
<td class="parameter_description"><p>error code</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>format</p></td>
<td class="parameter_description"><p>printf()-style format for error message</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>args</p></td>
<td class="parameter_description"><p><span class="type">va_list</span> of parameters for the message format</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.2.3.7.4.6"></a><h4>Returns</h4>
<p> a new <a href="https://developer.gnome.org/glib/unstable/glib-Error-Reporting.html#GError"><span class="type">GError</span></a></p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gvir-set-error"></a><h3>gvir_set_error ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gvir_set_error (<em class="parameter"><code><a href="https://developer.gnome.org/glib/unstable/glib-Error-Reporting.html#GError"><span class="type">GError</span></a> **error</code></em>,
<em class="parameter"><code><a href="https://developer.gnome.org/glib/unstable/glib-Quarks.html#GQuark"><span class="type">GQuark</span></a> domain</code></em>,
<em class="parameter"><code><a href="https://developer.gnome.org/glib/unstable/glib-Basic-Types.html#gint"><span class="type">gint</span></a> code</code></em>,
<em class="parameter"><code>const <a href="https://developer.gnome.org/glib/unstable/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *format</code></em>,
<em class="parameter"><code>...</code></em>);</pre>
<p>If <em class="parameter"><code>error</code></em>
is NULL this does nothing. Otherwise it
creates a new <a href="https://developer.gnome.org/glib/unstable/glib-Error-Reporting.html#GError"><span class="type">GError</span></a> with the given <em class="parameter"><code>domain</code></em>
and <em class="parameter"><code>code</code></em>
,
and a message formatted with <em class="parameter"><code>format</code></em>
, and stores it
in <em class="parameter"><code>error</code></em>
.</p>
<div class="refsect3">
<a name="id-1.2.3.7.5.5"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>error</p></td>
<td class="parameter_description"><p>pointer to error location</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>domain</p></td>
<td class="parameter_description"><p>error domain</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>code</p></td>
<td class="parameter_description"><p>error code</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>format</p></td>
<td class="parameter_description"><p>printf()-style format for error message</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>...</p></td>
<td class="parameter_description"><p>parameters for message format</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gvir-set-error-literal"></a><h3>gvir_set_error_literal ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gvir_set_error_literal (<em class="parameter"><code><a href="https://developer.gnome.org/glib/unstable/glib-Error-Reporting.html#GError"><span class="type">GError</span></a> **error</code></em>,
<em class="parameter"><code><a href="https://developer.gnome.org/glib/unstable/glib-Quarks.html#GQuark"><span class="type">GQuark</span></a> domain</code></em>,
<em class="parameter"><code><a href="https://developer.gnome.org/glib/unstable/glib-Basic-Types.html#gint"><span class="type">gint</span></a> code</code></em>,
<em class="parameter"><code>const <a href="https://developer.gnome.org/glib/unstable/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *message</code></em>);</pre>
<p>If <em class="parameter"><code>error</code></em>
is NULL this does nothing. Otherwise it
creates a new <a href="https://developer.gnome.org/glib/unstable/glib-Error-Reporting.html#GError"><span class="type">GError</span></a> and stores it in <em class="parameter"><code>error</code></em>
; unlike
<a class="link" href="Libvirt-glib-Error-reporting.html#gvir-set-error" title="gvir_set_error ()"><code class="function">gvir_set_error()</code></a>, <em class="parameter"><code>message</code></em>
is not a <code class="function">printf()</code>-style
format string. Use this function if <em class="parameter"><code>message</code></em>
contains
text you don't have control over, that could include
<code class="function">printf()</code> escape sequences.</p>
<div class="refsect3">
<a name="id-1.2.3.7.6.5"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>error</p></td>
<td class="parameter_description"><p>pointer to error location</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>domain</p></td>
<td class="parameter_description"><p>error domain</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>code</p></td>
<td class="parameter_description"><p>error code</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>message</p></td>
<td class="parameter_description"><p>error message</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gvir-set-error-valist"></a><h3>gvir_set_error_valist ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gvir_set_error_valist (<em class="parameter"><code><a href="https://developer.gnome.org/glib/unstable/glib-Error-Reporting.html#GError"><span class="type">GError</span></a> **error</code></em>,
<em class="parameter"><code><a href="https://developer.gnome.org/glib/unstable/glib-Quarks.html#GQuark"><span class="type">GQuark</span></a> domain</code></em>,
<em class="parameter"><code><a href="https://developer.gnome.org/glib/unstable/glib-Basic-Types.html#gint"><span class="type">gint</span></a> code</code></em>,
<em class="parameter"><code>const <a href="https://developer.gnome.org/glib/unstable/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *format</code></em>,
<em class="parameter"><code><span class="type">va_list</span> args</code></em>);</pre>
<p>If <em class="parameter"><code>error</code></em>
is NULL this does nothing. Otherwise it
creates a new <a href="https://developer.gnome.org/glib/unstable/glib-Error-Reporting.html#GError"><span class="type">GError</span></a> with the given <em class="parameter"><code>domain</code></em>
and <em class="parameter"><code>code</code></em>
,
and a message formatted with <em class="parameter"><code>format</code></em>
, and stores it
in <em class="parameter"><code>error</code></em>
.</p>
<div class="refsect3">
<a name="id-1.2.3.7.7.5"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>error</p></td>
<td class="parameter_description"><p>pointer to error location</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>domain</p></td>
<td class="parameter_description"><p>error domain</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>code</p></td>
<td class="parameter_description"><p>error code</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>format</p></td>
<td class="parameter_description"><p>printf()-style format for error message</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>args</p></td>
<td class="parameter_description"><p><span class="type">va_list</span> of parameters for the message format</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gvir-critical"></a><h3>gvir_critical ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gvir_critical (<em class="parameter"><code>const <a href="https://developer.gnome.org/glib/unstable/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *format</code></em>,
<em class="parameter"><code>...</code></em>);</pre>
</div>
<hr>
<div class="refsect2">
<a name="gvir-warning"></a><h3>gvir_warning ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gvir_warning (<em class="parameter"><code>const <a href="https://developer.gnome.org/glib/unstable/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *format</code></em>,
<em class="parameter"><code>...</code></em>);</pre>
</div>
</div>
<div class="refsect1">
<a name="Libvirt-glib-Error-reporting.other_details"></a><h2>Types and Values</h2>
</div>
</div>
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