xry111
/
lfs-book-zh_CN


			
				
					
						
						
							123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274275276277278279280281282283284285286287288289290291292293294295296297298299300301302303304305306307308309310311312313314315316317318319320321322323324325326327328329330331332333334335336337338339340341342343344345346347348349350351352353354355356357358359360361362363364365366367368369370371372373374375376377378379380381382383384385386387388389390391392393394395396397398399400401402403404405406407408409410411412413414415416417418419420421422423424425426427428429430431432433434435436437438439440441442443444445446447448449450451452453454455456457458459460461462463464465466467
							<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>GUdevClient</title>
<meta name="generator" content="DocBook XSL Stylesheets V1.77.1">
<link rel="home" href="index.html" title="GUdev Reference Manual">
<link rel="up" href="ref-API.html" title="API Reference">
<link rel="prev" href="ref-API.html" title="API Reference">
<link rel="next" href="GUdevDevice.html" title="GUdevDevice">
<meta name="generator" content="GTK-Doc V1.18 (XML mode)">
<link rel="stylesheet" href="style.css" type="text/css">
</head>
<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
<table class="navigation" id="top" width="100%" summary="Navigation header" cellpadding="2" cellspacing="2">
<tr valign="middle">
<td><a accesskey="p" href="ref-API.html"><img src="left.png" width="24" height="24" border="0" alt="Prev"></a></td>
<td><a accesskey="u" href="ref-API.html"><img src="up.png" width="24" height="24" border="0" alt="Up"></a></td>
<td><a accesskey="h" href="index.html"><img src="home.png" width="24" height="24" border="0" alt="Home"></a></td>
<th width="100%" align="center">GUdev Reference Manual</th>
<td><a accesskey="n" href="GUdevDevice.html"><img src="right.png" width="24" height="24" border="0" alt="Next"></a></td>
</tr>
<tr><td colspan="5" class="shortcuts">
<a href="#GUdevClient.synopsis" class="shortcut">Top</a>
                   | 
                  <a href="#GUdevClient.description" class="shortcut">Description</a>
                   | 
                  <a href="#GUdevClient.object-hierarchy" class="shortcut">Object Hierarchy</a>
                   | 
                  <a href="#GUdevClient.properties" class="shortcut">Properties</a>
                   | 
                  <a href="#GUdevClient.signals" class="shortcut">Signals</a>
</td></tr>
</table>
<div class="refentry">
<a name="GUdevClient"></a><div class="titlepage"></div>
<div class="refnamediv"><table width="100%"><tr>
<td valign="top">
<h2><span class="refentrytitle"><a name="GUdevClient.top_of_page"></a>GUdevClient</span></h2>
<p>GUdevClient — Query devices and listen to uevents</p>
</td>
<td valign="top" align="right"></td>
</tr></table></div>
<div class="refsynopsisdiv">
<a name="GUdevClient.synopsis"></a><h2>Synopsis</h2>
<a name="GUdevDeviceType"></a><pre class="synopsis">                    <a class="link" href="GUdevClient.html#GUdevClient-struct" title="GUdevClient">GUdevClient</a>;
struct              <a class="link" href="GUdevClient.html#GUdevClientClass" title="struct GUdevClientClass">GUdevClientClass</a>;
enum                <a class="link" href="GUdevClient.html#GUdevDeviceType-enum" title="enum GUdevDeviceType">GUdevDeviceType</a>;
typedef             <a class="link" href="GUdevClient.html#GUdevDeviceNumber" title="GUdevDeviceNumber">GUdevDeviceNumber</a>;
<a class="link" href="GUdevClient.html" title="GUdevClient"><span class="returnvalue">GUdevClient</span></a> *       <a class="link" href="GUdevClient.html#g-udev-client-new" title="g_udev_client_new ()">g_udev_client_new</a>                   (<em class="parameter"><code>const <span class="type">gchar</span> * const *subsystems</code></em>);
<span class="returnvalue">GList</span> *             <a class="link" href="GUdevClient.html#g-udev-client-query-by-subsystem" title="g_udev_client_query_by_subsystem ()">g_udev_client_query_by_subsystem</a>    (<em class="parameter"><code><a class="link" href="GUdevClient.html" title="GUdevClient"><span class="type">GUdevClient</span></a> *client</code></em>,
                                                         <em class="parameter"><code>const <span class="type">gchar</span> *subsystem</code></em>);
<a class="link" href="GUdevDevice.html" title="GUdevDevice"><span class="returnvalue">GUdevDevice</span></a> *       <a class="link" href="GUdevClient.html#g-udev-client-query-by-device-number" title="g_udev_client_query_by_device_number ()">g_udev_client_query_by_device_number</a>
                                                        (<em class="parameter"><code><a class="link" href="GUdevClient.html" title="GUdevClient"><span class="type">GUdevClient</span></a> *client</code></em>,
                                                         <em class="parameter"><code><a class="link" href="GUdevClient.html#GUdevDeviceType"><span class="type">GUdevDeviceType</span></a> type</code></em>,
                                                         <em class="parameter"><code><a class="link" href="GUdevClient.html#GUdevDeviceNumber" title="GUdevDeviceNumber"><span class="type">GUdevDeviceNumber</span></a> number</code></em>);
<a class="link" href="GUdevDevice.html" title="GUdevDevice"><span class="returnvalue">GUdevDevice</span></a> *       <a class="link" href="GUdevClient.html#g-udev-client-query-by-device-file" title="g_udev_client_query_by_device_file ()">g_udev_client_query_by_device_file</a>  (<em class="parameter"><code><a class="link" href="GUdevClient.html" title="GUdevClient"><span class="type">GUdevClient</span></a> *client</code></em>,
                                                         <em class="parameter"><code>const <span class="type">gchar</span> *device_file</code></em>);
<a class="link" href="GUdevDevice.html" title="GUdevDevice"><span class="returnvalue">GUdevDevice</span></a> *       <a class="link" href="GUdevClient.html#g-udev-client-query-by-sysfs-path" title="g_udev_client_query_by_sysfs_path ()">g_udev_client_query_by_sysfs_path</a>   (<em class="parameter"><code><a class="link" href="GUdevClient.html" title="GUdevClient"><span class="type">GUdevClient</span></a> *client</code></em>,
                                                         <em class="parameter"><code>const <span class="type">gchar</span> *sysfs_path</code></em>);
<a class="link" href="GUdevDevice.html" title="GUdevDevice"><span class="returnvalue">GUdevDevice</span></a> *       <a class="link" href="GUdevClient.html#g-udev-client-query-by-subsystem-and-name" title="g_udev_client_query_by_subsystem_and_name ()">g_udev_client_query_by_subsystem_and_name</a>
                                                        (<em class="parameter"><code><a class="link" href="GUdevClient.html" title="GUdevClient"><span class="type">GUdevClient</span></a> *client</code></em>,
                                                         <em class="parameter"><code>const <span class="type">gchar</span> *subsystem</code></em>,
                                                         <em class="parameter"><code>const <span class="type">gchar</span> *name</code></em>);
</pre>
</div>
<div class="refsect1">
<a name="GUdevClient.object-hierarchy"></a><h2>Object Hierarchy</h2>
<pre class="synopsis">
  GObject
   +----GUdevClient
</pre>
<pre class="synopsis">
  GEnum
   +----GUdevDeviceType
</pre>
</div>
<div class="refsect1">
<a name="GUdevClient.properties"></a><h2>Properties</h2>
<pre class="synopsis">
  "<a class="link" href="GUdevClient.html#GUdevClient--subsystems" title='The "subsystems" property'>subsystems</a>"               <span class="type">GStrv</span>                 : Read / Write / Construct Only
</pre>
</div>
<div class="refsect1">
<a name="GUdevClient.signals"></a><h2>Signals</h2>
<pre class="synopsis">
  "<a class="link" href="GUdevClient.html#GUdevClient-uevent" title='The "uevent" signal'>uevent</a>"                                         : <code class="literal">Run Last</code>
</pre>
</div>
<div class="refsect1">
<a name="GUdevClient.description"></a><h2>Description</h2>
<p>
<a class="link" href="GUdevClient.html" title="GUdevClient"><span class="type">GUdevClient</span></a> is used to query information about devices on a Linux
system from the Linux kernel and the udev device
manager.
</p>
<p>
Device information is retrieved from the kernel (through the
<code class="literal">sysfs</code> filesystem) and the udev daemon (through a
<code class="literal">tmpfs</code> filesystem) and presented through
<a class="link" href="GUdevDevice.html" title="GUdevDevice"><span class="type">GUdevDevice</span></a> objects. This means that no blocking IO ever happens
(in both cases, we are essentially just reading data from kernel
memory) and as such there are no asynchronous versions of the
provided methods.
</p>
<p>
To get <a class="link" href="GUdevDevice.html" title="GUdevDevice"><span class="type">GUdevDevice</span></a> objects, use
<a class="link" href="GUdevClient.html#g-udev-client-query-by-subsystem" title="g_udev_client_query_by_subsystem ()"><code class="function">g_udev_client_query_by_subsystem()</code></a>,
<a class="link" href="GUdevClient.html#g-udev-client-query-by-device-number" title="g_udev_client_query_by_device_number ()"><code class="function">g_udev_client_query_by_device_number()</code></a>,
<a class="link" href="GUdevClient.html#g-udev-client-query-by-device-file" title="g_udev_client_query_by_device_file ()"><code class="function">g_udev_client_query_by_device_file()</code></a>,
<a class="link" href="GUdevClient.html#g-udev-client-query-by-sysfs-path" title="g_udev_client_query_by_sysfs_path ()"><code class="function">g_udev_client_query_by_sysfs_path()</code></a>,
<a class="link" href="GUdevClient.html#g-udev-client-query-by-subsystem-and-name" title="g_udev_client_query_by_subsystem_and_name ()"><code class="function">g_udev_client_query_by_subsystem_and_name()</code></a>
or the <a class="link" href="GUdevEnumerator.html" title="GUdevEnumerator"><span class="type">GUdevEnumerator</span></a> type.
</p>
<p>
To listen to uevents, connect to the <a class="link" href="GUdevClient.html#GUdevClient-uevent" title='The "uevent" signal'><span class="type">"uevent"</span></a> signal.
</p>
</div>
<div class="refsect1">
<a name="GUdevClient.details"></a><h2>Details</h2>
<div class="refsect2">
<a name="GUdevClient-struct"></a><h3>GUdevClient</h3>
<pre class="programlisting">typedef struct _GUdevClient GUdevClient;</pre>
<p>
The <a class="link" href="GUdevClient.html" title="GUdevClient"><span class="type">GUdevClient</span></a> struct is opaque and should not be accessed directly.
</p>
</div>
<hr>
<div class="refsect2">
<a name="GUdevClientClass"></a><h3>struct GUdevClientClass</h3>
<pre class="programlisting">struct GUdevClientClass {
  GObjectClass   parent_class;

  /* signals */
  void (*uevent) (GUdevClient  *client,
                  const gchar  *action,
                  GUdevDevice  *device);
};
</pre>
<p>
Class structure for <a class="link" href="GUdevClient.html" title="GUdevClient"><span class="type">GUdevClient</span></a>.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><span class="type">GObjectClass</span> <em class="structfield"><code><a name="GUdevClientClass.parent-class"></a>parent_class</code></em>;</span></p></td>
<td>Parent class.</td>
</tr>
<tr>
<td><p><span class="term"><em class="structfield"><code><a name="GUdevClientClass.uevent"></a>uevent</code></em> ()</span></p></td>
<td>Signal class handler for the <a class="link" href="GUdevClient.html#GUdevClient-uevent" title='The "uevent" signal'><span class="type">"uevent"</span></a> signal.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GUdevDeviceType-enum"></a><h3>enum GUdevDeviceType</h3>
<pre class="programlisting">typedef enum {
  G_UDEV_DEVICE_TYPE_NONE = 0,
  G_UDEV_DEVICE_TYPE_BLOCK = 'b',
  G_UDEV_DEVICE_TYPE_CHAR = 'c',
} GUdevDeviceType;
</pre>
<p>
Enumeration used to specify a the type of a device.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><a name="G-UDEV-DEVICE-TYPE-NONE:CAPS"></a><span class="term"><code class="literal">G_UDEV_DEVICE_TYPE_NONE</code></span></p></td>
<td>Device does not have a device file.
</td>
</tr>
<tr>
<td><p><a name="G-UDEV-DEVICE-TYPE-BLOCK:CAPS"></a><span class="term"><code class="literal">G_UDEV_DEVICE_TYPE_BLOCK</code></span></p></td>
<td>Device is a block device.
</td>
</tr>
<tr>
<td><p><a name="G-UDEV-DEVICE-TYPE-CHAR:CAPS"></a><span class="term"><code class="literal">G_UDEV_DEVICE_TYPE_CHAR</code></span></p></td>
<td>Device is a character device.
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GUdevDeviceNumber"></a><h3>GUdevDeviceNumber</h3>
<pre class="programlisting">typedef guint64 GUdevDeviceNumber; /* __UQUAD_TYPE */
</pre>
<p>
Corresponds to the standard <span class="type">dev_t</span> type as defined by POSIX (Until
bug 584517 is resolved this work-around is needed).
</p>
</div>
<hr>
<div class="refsect2">
<a name="g-udev-client-new"></a><h3>g_udev_client_new ()</h3>
<pre class="programlisting"><a class="link" href="GUdevClient.html" title="GUdevClient"><span class="returnvalue">GUdevClient</span></a> *       g_udev_client_new                   (<em class="parameter"><code>const <span class="type">gchar</span> * const *subsystems</code></em>);</pre>
<p>
Constructs a <a class="link" href="GUdevClient.html" title="GUdevClient"><span class="type">GUdevClient</span></a> object that can be used to query
information about devices. Connect to the <a class="link" href="GUdevClient.html#GUdevClient-uevent" title='The "uevent" signal'><span class="type">"uevent"</span></a>
signal to listen for uevents. Note that signals are emitted in the
thread-default main loop
of the thread that you call this constructor from.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>subsystems</code></em> :</span></p></td>
<td>A <code class="literal">NULL</code> terminated string array of subsystems to listen for uevents on, <code class="literal">NULL</code> to not listen on uevents at all, or an empty array to listen to uevents on all subsystems. See the documentation for the <a class="link" href="GUdevClient.html#GUdevClient--subsystems" title='The "subsystems" property'><span class="type">"subsystems"</span></a> property for details on this parameter. <span class="annotation">[<acronym title="Parameter points to an array of items."><span class="acronym">array</span></acronym> zero-terminated=1][<acronym title="Generics and defining elements of containers and arrays."><span class="acronym">element-type</span></acronym> utf8][<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>][<acronym title="NULL is ok, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>A new <a class="link" href="GUdevClient.html" title="GUdevClient"><span class="type">GUdevClient</span></a> object. Free with <code class="function">g_object_unref()</code>.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="g-udev-client-query-by-subsystem"></a><h3>g_udev_client_query_by_subsystem ()</h3>
<pre class="programlisting"><span class="returnvalue">GList</span> *             g_udev_client_query_by_subsystem    (<em class="parameter"><code><a class="link" href="GUdevClient.html" title="GUdevClient"><span class="type">GUdevClient</span></a> *client</code></em>,
                                                         <em class="parameter"><code>const <span class="type">gchar</span> *subsystem</code></em>);</pre>
<p>
Gets all devices belonging to <em class="parameter"><code>subsystem</code></em>.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>client</code></em> :</span></p></td>
<td>A <a class="link" href="GUdevClient.html" title="GUdevClient"><span class="type">GUdevClient</span></a>.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>subsystem</code></em> :</span></p></td>
<td>The subsystem to get devices for or <code class="literal">NULL</code> to get all devices. <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><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>A list of <a class="link" href="GUdevDevice.html" title="GUdevDevice"><span class="type">GUdevDevice</span></a> objects. The caller should free the result by using <code class="function">g_object_unref()</code> on each element in the list and then <code class="function">g_list_free()</code> on the list. <span class="annotation">[<acronym title="Generics and defining elements of containers and arrays."><span class="acronym">element-type</span></acronym> GUdevDevice][<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="g-udev-client-query-by-device-number"></a><h3>g_udev_client_query_by_device_number ()</h3>
<pre class="programlisting"><a class="link" href="GUdevDevice.html" title="GUdevDevice"><span class="returnvalue">GUdevDevice</span></a> *       g_udev_client_query_by_device_number
                                                        (<em class="parameter"><code><a class="link" href="GUdevClient.html" title="GUdevClient"><span class="type">GUdevClient</span></a> *client</code></em>,
                                                         <em class="parameter"><code><a class="link" href="GUdevClient.html#GUdevDeviceType"><span class="type">GUdevDeviceType</span></a> type</code></em>,
                                                         <em class="parameter"><code><a class="link" href="GUdevClient.html#GUdevDeviceNumber" title="GUdevDeviceNumber"><span class="type">GUdevDeviceNumber</span></a> number</code></em>);</pre>
<p>
Looks up a device for a type and device number.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>client</code></em> :</span></p></td>
<td>A <a class="link" href="GUdevClient.html" title="GUdevClient"><span class="type">GUdevClient</span></a>.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>type</code></em> :</span></p></td>
<td>A value from the <a class="link" href="GUdevClient.html#GUdevDeviceType"><span class="type">GUdevDeviceType</span></a> enumeration.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>number</code></em> :</span></p></td>
<td>A device number.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>A <a class="link" href="GUdevDevice.html" title="GUdevDevice"><span class="type">GUdevDevice</span></a> object or <code class="literal">NULL</code> if the device was not found. Free with <code class="function">g_object_unref()</code>. <span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="g-udev-client-query-by-device-file"></a><h3>g_udev_client_query_by_device_file ()</h3>
<pre class="programlisting"><a class="link" href="GUdevDevice.html" title="GUdevDevice"><span class="returnvalue">GUdevDevice</span></a> *       g_udev_client_query_by_device_file  (<em class="parameter"><code><a class="link" href="GUdevClient.html" title="GUdevClient"><span class="type">GUdevClient</span></a> *client</code></em>,
                                                         <em class="parameter"><code>const <span class="type">gchar</span> *device_file</code></em>);</pre>
<p>
Looks up a device for a device file.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>client</code></em> :</span></p></td>
<td>A <a class="link" href="GUdevClient.html" title="GUdevClient"><span class="type">GUdevClient</span></a>.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>device_file</code></em> :</span></p></td>
<td>A device file.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>A <a class="link" href="GUdevDevice.html" title="GUdevDevice"><span class="type">GUdevDevice</span></a> object or <code class="literal">NULL</code> if the device was not found. Free with <code class="function">g_object_unref()</code>. <span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="g-udev-client-query-by-sysfs-path"></a><h3>g_udev_client_query_by_sysfs_path ()</h3>
<pre class="programlisting"><a class="link" href="GUdevDevice.html" title="GUdevDevice"><span class="returnvalue">GUdevDevice</span></a> *       g_udev_client_query_by_sysfs_path   (<em class="parameter"><code><a class="link" href="GUdevClient.html" title="GUdevClient"><span class="type">GUdevClient</span></a> *client</code></em>,
                                                         <em class="parameter"><code>const <span class="type">gchar</span> *sysfs_path</code></em>);</pre>
<p>
Looks up a device for a sysfs path.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>client</code></em> :</span></p></td>
<td>A <a class="link" href="GUdevClient.html" title="GUdevClient"><span class="type">GUdevClient</span></a>.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>sysfs_path</code></em> :</span></p></td>
<td>A sysfs path.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>A <a class="link" href="GUdevDevice.html" title="GUdevDevice"><span class="type">GUdevDevice</span></a> object or <code class="literal">NULL</code> if the device was not found. Free with <code class="function">g_object_unref()</code>. <span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="g-udev-client-query-by-subsystem-and-name"></a><h3>g_udev_client_query_by_subsystem_and_name ()</h3>
<pre class="programlisting"><a class="link" href="GUdevDevice.html" title="GUdevDevice"><span class="returnvalue">GUdevDevice</span></a> *       g_udev_client_query_by_subsystem_and_name
                                                        (<em class="parameter"><code><a class="link" href="GUdevClient.html" title="GUdevClient"><span class="type">GUdevClient</span></a> *client</code></em>,
                                                         <em class="parameter"><code>const <span class="type">gchar</span> *subsystem</code></em>,
                                                         <em class="parameter"><code>const <span class="type">gchar</span> *name</code></em>);</pre>
<p>
Looks up a device for a subsystem and name.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>client</code></em> :</span></p></td>
<td>A <a class="link" href="GUdevClient.html" title="GUdevClient"><span class="type">GUdevClient</span></a>.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>subsystem</code></em> :</span></p></td>
<td>A subsystem name.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>name</code></em> :</span></p></td>
<td>The name of the device.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>A <a class="link" href="GUdevDevice.html" title="GUdevDevice"><span class="type">GUdevDevice</span></a> object or <code class="literal">NULL</code> if the device was not found. Free with <code class="function">g_object_unref()</code>. <span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span>
</td>
</tr>
</tbody>
</table></div>
</div>
</div>
<div class="refsect1">
<a name="GUdevClient.property-details"></a><h2>Property Details</h2>
<div class="refsect2">
<a name="GUdevClient--subsystems"></a><h3>The <code class="literal">"subsystems"</code> property</h3>
<pre class="programlisting">  "subsystems"               <span class="type">GStrv</span>                 : Read / Write / Construct Only</pre>
<p>
The subsystems to listen for uevents on.
</p>
<p>
To listen for only a specific DEVTYPE for a given SUBSYSTEM, use
"subsystem/devtype". For example, to only listen for uevents
where SUBSYSTEM is usb and DEVTYPE is usb_interface, use
"usb/usb_interface".
</p>
<p>
If this property is <code class="literal">NULL</code>, then no events will be reported. If
it's the empty array, events from all subsystems will be
reported.
</p>
</div>
</div>
<div class="refsect1">
<a name="GUdevClient.signal-details"></a><h2>Signal Details</h2>
<div class="refsect2">
<a name="GUdevClient-uevent"></a><h3>The <code class="literal">"uevent"</code> signal</h3>
<pre class="programlisting"><span class="returnvalue">void</span>                user_function                      (<a class="link" href="GUdevClient.html" title="GUdevClient"><span class="type">GUdevClient</span></a> *client,
                                                        <span class="type">gchar</span>       *action,
                                                        <a class="link" href="GUdevDevice.html" title="GUdevDevice"><span class="type">GUdevDevice</span></a> *device,
                                                        <span class="type">gpointer</span>     user_data)      : <code class="literal">Run Last</code></pre>
<p>
Emitted when <em class="parameter"><code>client</code></em> receives an uevent.
</p>
<p>
This signal is emitted in the
thread-default main loop
of the thread that <em class="parameter"><code>client</code></em> was created in.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>client</code></em> :</span></p></td>
<td>The <a class="link" href="GUdevClient.html" title="GUdevClient"><span class="type">GUdevClient</span></a> receiving the event.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>action</code></em> :</span></p></td>
<td>The action for the uevent e.g. "add", "remove", "change", "move", etc.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>device</code></em> :</span></p></td>
<td>Details about the <a class="link" href="GUdevDevice.html" title="GUdevDevice"><span class="type">GUdevDevice</span></a> the event is for.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>user_data</code></em> :</span></p></td>
<td>user data set when the signal handler was connected.</td>
</tr>
</tbody>
</table></div>
</div>
</div>
</div>
<div class="footer">
<hr>
          Generated by GTK-Doc V1.18</div>
</body>
</html>