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<div class="refentry">
<a name="PolkitSubject"></a><div class="titlepage"></div>
<div class="refnamediv"><table width="100%"><tr>
<td valign="top">
<h2><span class="refentrytitle"><a name="PolkitSubject.top_of_page"></a>PolkitSubject</span></h2>
<p>PolkitSubject — Type for representing subjects</p>
</td>
<td class="gallery_image" valign="top" align="right"></td>
</tr></table></div>
<div class="refsect1">
<a name="PolkitSubject.functions"></a><h2>Functions</h2>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="functions_proto_type">
<col class="functions_proto_name">
</colgroup>
<tbody>
<tr>
<td class="function_type">
<span class="returnvalue">guint</span>
</td>
<td class="function_name">
<a class="link" href="PolkitSubject.html#polkit-subject-hash" title="polkit_subject_hash ()">polkit_subject_hash</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">gboolean</span>
</td>
<td class="function_name">
<a class="link" href="PolkitSubject.html#polkit-subject-equal" title="polkit_subject_equal ()">polkit_subject_equal</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="PolkitSubject.html#polkit-subject-exists" title="polkit_subject_exists ()">polkit_subject_exists</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">gboolean</span>
</td>
<td class="function_name">
<a class="link" href="PolkitSubject.html#polkit-subject-exists-finish" title="polkit_subject_exists_finish ()">polkit_subject_exists_finish</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">gboolean</span>
</td>
<td class="function_name">
<a class="link" href="PolkitSubject.html#polkit-subject-exists-sync" title="polkit_subject_exists_sync ()">polkit_subject_exists_sync</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">gchar</span> *
</td>
<td class="function_name">
<a class="link" href="PolkitSubject.html#polkit-subject-to-string" title="polkit_subject_to_string ()">polkit_subject_to_string</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="PolkitSubject.html" title="PolkitSubject"><span class="returnvalue">PolkitSubject</span></a> *
</td>
<td class="function_name">
<a class="link" href="PolkitSubject.html#polkit-subject-from-string" title="polkit_subject_from_string ()">polkit_subject_from_string</a> <span class="c_punctuation">()</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="PolkitSubject.other"></a><h2>Types and Values</h2>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="other_proto_type">
<col class="other_proto_name">
</colgroup>
<tbody>
<tr>
<td class="datatype_keyword"> </td>
<td class="function_name"><a class="link" href="PolkitSubject.html#PolkitSubject-struct" title="PolkitSubject">PolkitSubject</a></td>
</tr>
<tr>
<td class="datatype_keyword">struct</td>
<td class="function_name"><a class="link" href="PolkitSubject.html#PolkitSubjectIface" title="struct PolkitSubjectIface">PolkitSubjectIface</a></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="PolkitSubject.object-hierarchy"></a><h2>Object Hierarchy</h2>
<pre class="screen"> <a href="/usr/share/gtk-doc/html/gobject/GTypeModule.html">GInterface</a>
<span class="lineart">╰──</span> PolkitSubject
</pre>
</div>
<div class="refsect1">
<a name="PolkitSubject.prerequisites"></a><h2>Prerequisites</h2>
<p>
PolkitSubject requires
GObject.</p>
</div>
<div class="refsect1">
<a name="PolkitSubject.implementations"></a><h2>Known Implementations</h2>
<p>
PolkitSubject is implemented by
<a class="link" href="PolkitSystemBusName.html" title="PolkitSystemBusName">PolkitSystemBusName</a>, <a class="link" href="PolkitUnixProcess.html" title="PolkitUnixProcess">PolkitUnixProcess</a> and <a class="link" href="PolkitUnixSession.html" title="PolkitUnixSession">PolkitUnixSession</a>.</p>
</div>
<div class="refsect1">
<a name="PolkitSubject.description"></a><h2>Description</h2>
<p><a class="link" href="PolkitSubject.html" title="PolkitSubject"><span class="type">PolkitSubject</span></a> is an abstract type for representing one or more
processes.</p>
</div>
<div class="refsect1">
<a name="PolkitSubject.functions_details"></a><h2>Functions</h2>
<div class="refsect2">
<a name="polkit-subject-hash"></a><h3>polkit_subject_hash ()</h3>
<pre class="programlisting"><span class="returnvalue">guint</span>
polkit_subject_hash (<em class="parameter"><code><a class="link" href="PolkitSubject.html" title="PolkitSubject"><span class="type">PolkitSubject</span></a> *subject</code></em>);</pre>
<p>Gets a hash code for <em class="parameter"><code>subject</code></em>
that can be used with e.g. <code class="function">g_hash_table_new()</code>.</p>
<div class="refsect3">
<a name="polkit-subject-hash.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" 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>subject</p></td>
<td class="parameter_description"><p>A <a class="link" href="PolkitSubject.html" title="PolkitSubject"><span class="type">PolkitSubject</span></a>.</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="polkit-subject-hash.returns"></a><h4>Returns</h4>
<p> A hash code.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="polkit-subject-equal"></a><h3>polkit_subject_equal ()</h3>
<pre class="programlisting"><span class="returnvalue">gboolean</span>
polkit_subject_equal (<em class="parameter"><code><a class="link" href="PolkitSubject.html" title="PolkitSubject"><span class="type">PolkitSubject</span></a> *a</code></em>,
<em class="parameter"><code><a class="link" href="PolkitSubject.html" title="PolkitSubject"><span class="type">PolkitSubject</span></a> *b</code></em>);</pre>
<p>Checks if <em class="parameter"><code>a</code></em>
and <em class="parameter"><code>b</code></em>
are equal, ie. represent the same subject.
However, avoid calling <a class="link" href="PolkitSubject.html#polkit-subject-equal" title="polkit_subject_equal ()"><code class="function">polkit_subject_equal()</code></a> to compare two processes;
for more information see the <code class="literal">PolkitUnixProcess</code> documentation.</p>
<p>This function can be used in e.g. <code class="function">g_hash_table_new()</code>.</p>
<div class="refsect3">
<a name="polkit-subject-equal.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" 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>a</p></td>
<td class="parameter_description"><p>A <a class="link" href="PolkitSubject.html" title="PolkitSubject"><span class="type">PolkitSubject</span></a>.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>b</p></td>
<td class="parameter_description"><p>A <a class="link" href="PolkitSubject.html" title="PolkitSubject"><span class="type">PolkitSubject</span></a>.</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="polkit-subject-equal.returns"></a><h4>Returns</h4>
<p> <code class="literal">TRUE</code> if <em class="parameter"><code>a</code></em>
and <em class="parameter"><code>b</code></em>
are equal, <code class="literal">FALSE</code> otherwise.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="polkit-subject-exists"></a><h3>polkit_subject_exists ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
polkit_subject_exists (<em class="parameter"><code><a class="link" href="PolkitSubject.html" title="PolkitSubject"><span class="type">PolkitSubject</span></a> *subject</code></em>,
<em class="parameter"><code><span class="type">GCancellable</span> *cancellable</code></em>,
<em class="parameter"><code><span class="type">GAsyncReadyCallback</span> callback</code></em>,
<em class="parameter"><code><span class="type">gpointer</span> user_data</code></em>);</pre>
<p>Asynchronously checks if <em class="parameter"><code>subject</code></em>
exists.</p>
<p>When the operation is finished, <em class="parameter"><code>callback</code></em>
will be invoked in the</p>
<GTKDOCLINK HREF="g-main-context-push-thread-default">thread-default
main loop</GTKDOCLINK> of the thread you are calling this method
<p>from. You can then call <a class="link" href="PolkitSubject.html#polkit-subject-exists-finish" title="polkit_subject_exists_finish ()"><code class="function">polkit_subject_exists_finish()</code></a> to get the
result of the operation.</p>
<div class="refsect3">
<a name="polkit-subject-exists.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" 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>subject</p></td>
<td class="parameter_description"><p>A <a class="link" href="PolkitSubject.html" title="PolkitSubject"><span class="type">PolkitSubject</span></a>.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>cancellable</p></td>
<td class="parameter_description"><p>A <span class="type">GCancellable</span> or <code class="literal">NULL</code>. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="NULL is OK, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span></td>
</tr>
<tr>
<td class="parameter_name"><p>callback</p></td>
<td class="parameter_description"><p>A <span class="type">GAsyncReadyCallback</span> to call when the request is satisfied</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>user_data</p></td>
<td class="parameter_description"><p>The data to pass to <em class="parameter"><code>callback</code></em>
.</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="polkit-subject-exists-finish"></a><h3>polkit_subject_exists_finish ()</h3>
<pre class="programlisting"><span class="returnvalue">gboolean</span>
polkit_subject_exists_finish (<em class="parameter"><code><a class="link" href="PolkitSubject.html" title="PolkitSubject"><span class="type">PolkitSubject</span></a> *subject</code></em>,
<em class="parameter"><code><span class="type">GAsyncResult</span> *res</code></em>,
<em class="parameter"><code><span class="type">GError</span> **error</code></em>);</pre>
<p>Finishes checking whether a subject exists.</p>
<div class="refsect3">
<a name="polkit-subject-exists-finish.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" 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>subject</p></td>
<td class="parameter_description"><p>A <a class="link" href="PolkitSubject.html" title="PolkitSubject"><span class="type">PolkitSubject</span></a>.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>res</p></td>
<td class="parameter_description"><p>A <span class="type">GAsyncResult</span> obtained from the <span class="type">GAsyncReadyCallback</span> passed to <a class="link" href="PolkitSubject.html#polkit-subject-exists" title="polkit_subject_exists ()"><code class="function">polkit_subject_exists()</code></a>.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>error</p></td>
<td class="parameter_description"><p>Return location for error or <code class="literal">NULL</code>. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="NULL is OK, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="polkit-subject-exists-finish.returns"></a><h4>Returns</h4>
<p> <code class="literal">TRUE</code> if the subject exists, <code class="literal">FALSE</code> if not or <em class="parameter"><code>error</code></em>
is set.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="polkit-subject-exists-sync"></a><h3>polkit_subject_exists_sync ()</h3>
<pre class="programlisting"><span class="returnvalue">gboolean</span>
polkit_subject_exists_sync (<em class="parameter"><code><a class="link" href="PolkitSubject.html" title="PolkitSubject"><span class="type">PolkitSubject</span></a> *subject</code></em>,
<em class="parameter"><code><span class="type">GCancellable</span> *cancellable</code></em>,
<em class="parameter"><code><span class="type">GError</span> **error</code></em>);</pre>
<p>Checks if <em class="parameter"><code>subject</code></em>
exists.</p>
<p>This is a synchronous blocking call - the calling thread is blocked
until a reply is received. See <a class="link" href="PolkitSubject.html#polkit-subject-exists" title="polkit_subject_exists ()"><code class="function">polkit_subject_exists()</code></a> for the
asynchronous version.</p>
<div class="refsect3">
<a name="polkit-subject-exists-sync.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" 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>subject</p></td>
<td class="parameter_description"><p>A <a class="link" href="PolkitSubject.html" title="PolkitSubject"><span class="type">PolkitSubject</span></a>.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>cancellable</p></td>
<td class="parameter_description"><p>A <span class="type">GCancellable</span> or <code class="literal">NULL</code>. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="NULL is OK, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span></td>
</tr>
<tr>
<td class="parameter_name"><p>error</p></td>
<td class="parameter_description"><p>Return location for error or <code class="literal">NULL</code>. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="NULL is OK, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="polkit-subject-exists-sync.returns"></a><h4>Returns</h4>
<p> <code class="literal">TRUE</code> if the subject exists, <code class="literal">FALSE</code> if not or <em class="parameter"><code>error</code></em>
is set.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="polkit-subject-to-string"></a><h3>polkit_subject_to_string ()</h3>
<pre class="programlisting"><span class="returnvalue">gchar</span> *
polkit_subject_to_string (<em class="parameter"><code><a class="link" href="PolkitSubject.html" title="PolkitSubject"><span class="type">PolkitSubject</span></a> *subject</code></em>);</pre>
<p>Serializes <em class="parameter"><code>subject</code></em>
to a string that can be used in
<a class="link" href="PolkitSubject.html#polkit-subject-from-string" title="polkit_subject_from_string ()"><code class="function">polkit_subject_from_string()</code></a>.</p>
<div class="refsect3">
<a name="polkit-subject-to-string.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" 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>subject</p></td>
<td class="parameter_description"><p>A <a class="link" href="PolkitSubject.html" title="PolkitSubject"><span class="type">PolkitSubject</span></a>.</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="polkit-subject-to-string.returns"></a><h4>Returns</h4>
<p> A string representing <em class="parameter"><code>subject</code></em>
. Free with <code class="function">g_free()</code>.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="polkit-subject-from-string"></a><h3>polkit_subject_from_string ()</h3>
<pre class="programlisting"><a class="link" href="PolkitSubject.html" title="PolkitSubject"><span class="returnvalue">PolkitSubject</span></a> *
polkit_subject_from_string (<em class="parameter"><code>const <span class="type">gchar</span> *str</code></em>,
<em class="parameter"><code><span class="type">GError</span> **error</code></em>);</pre>
<p>Creates an object from <em class="parameter"><code>str</code></em>
that implements the <a class="link" href="PolkitSubject.html" title="PolkitSubject"><span class="type">PolkitSubject</span></a>
interface.</p>
<div class="refsect3">
<a name="polkit-subject-from-string.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" 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>str</p></td>
<td class="parameter_description"><p>A string obtained from <a class="link" href="PolkitSubject.html#polkit-subject-to-string" title="polkit_subject_to_string ()"><code class="function">polkit_subject_to_string()</code></a>.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>error</p></td>
<td class="parameter_description"><p>Return location for error or <code class="literal">NULL</code>. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="NULL is OK, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="polkit-subject-from-string.returns"></a><h4>Returns</h4>
<p>A <a class="link" href="PolkitSubject.html" title="PolkitSubject"><span class="type">PolkitSubject</span></a> or <code class="literal">NULL</code> if <em class="parameter"><code>error</code></em>
is
set. Free with <code class="function">g_object_unref()</code>. </p>
<p><span class="annotation">[<acronym title="The caller owns the data, and is responsible for free it."><span class="acronym">transfer full</span></acronym>]</span></p>
</div>
</div>
</div>
<div class="refsect1">
<a name="PolkitSubject.other_details"></a><h2>Types and Values</h2>
<div class="refsect2">
<a name="PolkitSubject-struct"></a><h3>PolkitSubject</h3>
<pre class="programlisting">typedef struct _PolkitSubject PolkitSubject;</pre>
<p>Generic type for all objects that can be used as subjects.</p>
</div>
<hr>
<div class="refsect2">
<a name="PolkitSubjectIface"></a><h3>struct PolkitSubjectIface</h3>
<pre class="programlisting">struct PolkitSubjectIface {
GTypeInterface parent_iface;
guint (*hash) (PolkitSubject *subject);
gboolean (*equal) (PolkitSubject *a,
PolkitSubject *b);
gchar * (*to_string) (PolkitSubject *subject);
void (*exists) (PolkitSubject *subject,
GCancellable *cancellable,
GAsyncReadyCallback callback,
gpointer user_data);
gboolean (*exists_finish) (PolkitSubject *subject,
GAsyncResult *res,
GError **error);
gboolean (*exists_sync) (PolkitSubject *subject,
GCancellable *cancellable,
GError **error);
};
</pre>
<p>An interface for subjects.</p>
<div class="refsect3">
<a name="PolkitSubjectIface.members"></a><h4>Members</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="300px" class="struct_members_name">
<col class="struct_members_description">
<col width="200px" class="struct_members_annotations">
</colgroup>
<tbody>
<tr>
<td class="struct_member_name"><p><span class="type">GTypeInterface</span> <em class="structfield"><code><a name="PolkitSubjectIface.parent-iface"></a>parent_iface</code></em>;</p></td>
<td class="struct_member_description"><p>The parent interface.</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><em class="structfield"><code><a name="PolkitSubjectIface.hash"></a>hash</code></em> ()</p></td>
<td class="struct_member_description"><p>Gets a hash value for a <a class="link" href="PolkitSubject.html" title="PolkitSubject"><span class="type">PolkitSubject</span></a>.</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><em class="structfield"><code><a name="PolkitSubjectIface.equal"></a>equal</code></em> ()</p></td>
<td class="struct_member_description"><p>Checks if two <a class="link" href="PolkitSubject.html" title="PolkitSubject"><span class="type">PolkitSubject</span></a>s are equal.</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><em class="structfield"><code><a name="PolkitSubjectIface.to-string"></a>to_string</code></em> ()</p></td>
<td class="struct_member_description"><p>Serializes a <a class="link" href="PolkitSubject.html" title="PolkitSubject"><span class="type">PolkitSubject</span></a> to a string that can be
used in <a class="link" href="PolkitSubject.html#polkit-subject-from-string" title="polkit_subject_from_string ()"><code class="function">polkit_subject_from_string()</code></a>.</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><em class="structfield"><code><a name="PolkitSubjectIface.exists"></a>exists</code></em> ()</p></td>
<td class="struct_member_description"><p>Asynchronously check if a <a class="link" href="PolkitSubject.html" title="PolkitSubject"><span class="type">PolkitSubject</span></a> exists.</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><em class="structfield"><code><a name="PolkitSubjectIface.exists-finish"></a>exists_finish</code></em> ()</p></td>
<td class="struct_member_description"><p>Finishes checking if a <a class="link" href="PolkitSubject.html" title="PolkitSubject"><span class="type">PolkitSubject</span></a> exists.</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><em class="structfield"><code><a name="PolkitSubjectIface.exists-sync"></a>exists_sync</code></em> ()</p></td>
<td class="struct_member_description"><p>Synchronously check if a <a class="link" href="PolkitSubject.html" title="PolkitSubject"><span class="type">PolkitSubject</span></a> exists.</p></td>
<td class="struct_member_annotations"> </td>
</tr>
</tbody>
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