docs/libudev/html/libudev-udev-device.html

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  24 <a href="#libudev-udev-device.synopsis" class="shortcut">Top</a>
  25                    |
  26                   <a href="#libudev-udev-device.description" class="shortcut">Description</a>
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  29 <div class="refentry">
  30 <a name="libudev-udev-device"></a><div class="titlepage"></div>
  31 <div class="refnamediv"><table width="100%"><tr>
  32 <td valign="top">
  33 <h2><span class="refentrytitle"><a name="libudev-udev-device.top_of_page"></a>udev_device</span></h2>
  34 <p>udev_device — kernel sys devices</p>
  35 </td>
  36 <td valign="top" align="right"></td>
  37 </tr></table></div>
  38 <div class="refsynopsisdiv">
  39 <a name="libudev-udev-device.synopsis"></a><h2>Synopsis</h2>
  40 <pre class="synopsis">struct              <a class="link" href="libudev-udev-device.html#udev-device" title="struct udev_device">udev_device</a>;
  41 struct <a class="link" href="libudev-udev-device.html#udev-device" title="struct udev_device"><span class="returnvalue">udev_device</span></a> * <a class="link" href="libudev-udev-device.html#udev-device-ref" title="udev_device_ref ()">udev_device_ref</a>                    (<em class="parameter"><code><span class="type">struct udev_device</span> *udev_device</code></em>);
  42 struct <a class="link" href="libudev-udev-device.html#udev-device" title="struct udev_device"><span class="returnvalue">udev_device</span></a> * <a class="link" href="libudev-udev-device.html#udev-device-unref" title="udev_device_unref ()">udev_device_unref</a>                  (<em class="parameter"><code><span class="type">struct udev_device</span> *udev_device</code></em>);
  43 struct <a class="link" href="libudev-udev.html#udev" title="struct udev"><span class="returnvalue">udev</span></a> *       <a class="link" href="libudev-udev-device.html#udev-device-get-udev" title="udev_device_get_udev ()">udev_device_get_udev</a>                (<em class="parameter"><code><span class="type">struct udev_device</span> *udev_device</code></em>);
  44 struct <a class="link" href="libudev-udev-device.html#udev-device" title="struct udev_device"><span class="returnvalue">udev_device</span></a> * <a class="link" href="libudev-udev-device.html#udev-device-new-from-syspath" title="udev_device_new_from_syspath ()">udev_device_new_from_syspath</a>       (<em class="parameter"><code><span class="type">struct udev</span> *udev</code></em>,
  45                                                          <em class="parameter"><code>const <span class="type">char</span> *syspath</code></em>);
  46 struct <a class="link" href="libudev-udev-device.html#udev-device" title="struct udev_device"><span class="returnvalue">udev_device</span></a> * <a class="link" href="libudev-udev-device.html#udev-device-new-from-devnum" title="udev_device_new_from_devnum ()">udev_device_new_from_devnum</a>        (<em class="parameter"><code><span class="type">struct udev</span> *udev</code></em>,
  47                                                          <em class="parameter"><code><span class="type">char</span> type</code></em>,
  48                                                          <em class="parameter"><code><span class="type">dev_t</span> devnum</code></em>);
  49 struct <a class="link" href="libudev-udev-device.html#udev-device" title="struct udev_device"><span class="returnvalue">udev_device</span></a> * <a class="link" href="libudev-udev-device.html#udev-device-new-from-subsystem-sysname" title="udev_device_new_from_subsystem_sysname ()">udev_device_new_from_subsystem_sysname</a>
  50                                                         (<em class="parameter"><code><span class="type">struct udev</span> *udev</code></em>,
  51                                                          <em class="parameter"><code>const <span class="type">char</span> *subsystem</code></em>,
  52                                                          <em class="parameter"><code>const <span class="type">char</span> *sysname</code></em>);
  53 struct <a class="link" href="libudev-udev-device.html#udev-device" title="struct udev_device"><span class="returnvalue">udev_device</span></a> * <a class="link" href="libudev-udev-device.html#udev-device-new-from-device-id" title="udev_device_new_from_device_id ()">udev_device_new_from_device_id</a>     (<em class="parameter"><code><span class="type">struct udev</span> *udev</code></em>,
  54                                                          <em class="parameter"><code><span class="type">char</span> *id</code></em>);
  55 struct <a class="link" href="libudev-udev-device.html#udev-device" title="struct udev_device"><span class="returnvalue">udev_device</span></a> * <a class="link" href="libudev-udev-device.html#udev-device-new-from-environment" title="udev_device_new_from_environment ()">udev_device_new_from_environment</a>   (<em class="parameter"><code><span class="type">struct udev</span> *udev</code></em>);
  56 struct <a class="link" href="libudev-udev-device.html#udev-device" title="struct udev_device"><span class="returnvalue">udev_device</span></a> * <a class="link" href="libudev-udev-device.html#udev-device-get-parent" title="udev_device_get_parent ()">udev_device_get_parent</a>             (<em class="parameter"><code><span class="type">struct udev_device</span> *udev_device</code></em>);
  57 struct <a class="link" href="libudev-udev-device.html#udev-device" title="struct udev_device"><span class="returnvalue">udev_device</span></a> * <a class="link" href="libudev-udev-device.html#udev-device-get-parent-with-subsystem-devtype" title="udev_device_get_parent_with_subsystem_devtype ()">udev_device_get_parent_with_subsystem_devtype</a>
  58                                                         (<em class="parameter"><code><span class="type">struct udev_device</span> *udev_device</code></em>,
  59                                                          <em class="parameter"><code>const <span class="type">char</span> *subsystem</code></em>,
  60                                                          <em class="parameter"><code>const <span class="type">char</span> *devtype</code></em>);
  61 const <span class="returnvalue">char</span> *        <a class="link" href="libudev-udev-device.html#udev-device-get-devpath" title="udev_device_get_devpath ()">udev_device_get_devpath</a>             (<em class="parameter"><code><span class="type">struct udev_device</span> *udev_device</code></em>);
  62 const <span class="returnvalue">char</span> *        <a class="link" href="libudev-udev-device.html#udev-device-get-subsystem" title="udev_device_get_subsystem ()">udev_device_get_subsystem</a>           (<em class="parameter"><code><span class="type">struct udev_device</span> *udev_device</code></em>);
  63 const <span class="returnvalue">char</span> *        <a class="link" href="libudev-udev-device.html#udev-device-get-devtype" title="udev_device_get_devtype ()">udev_device_get_devtype</a>             (<em class="parameter"><code><span class="type">struct udev_device</span> *udev_device</code></em>);
  64 const <span class="returnvalue">char</span> *        <a class="link" href="libudev-udev-device.html#udev-device-get-syspath" title="udev_device_get_syspath ()">udev_device_get_syspath</a>             (<em class="parameter"><code><span class="type">struct udev_device</span> *udev_device</code></em>);
  65 const <span class="returnvalue">char</span> *        <a class="link" href="libudev-udev-device.html#udev-device-get-sysname" title="udev_device_get_sysname ()">udev_device_get_sysname</a>             (<em class="parameter"><code><span class="type">struct udev_device</span> *udev_device</code></em>);
  66 const <span class="returnvalue">char</span> *        <a class="link" href="libudev-udev-device.html#udev-device-get-sysnum" title="udev_device_get_sysnum ()">udev_device_get_sysnum</a>              (<em class="parameter"><code><span class="type">struct udev_device</span> *udev_device</code></em>);
  67 const <span class="returnvalue">char</span> *        <a class="link" href="libudev-udev-device.html#udev-device-get-devnode" title="udev_device_get_devnode ()">udev_device_get_devnode</a>             (<em class="parameter"><code><span class="type">struct udev_device</span> *udev_device</code></em>);
  68 <span class="returnvalue">int</span>                 <a class="link" href="libudev-udev-device.html#udev-device-get-is-initialized" title="udev_device_get_is_initialized ()">udev_device_get_is_initialized</a>      (<em class="parameter"><code><span class="type">struct udev_device</span> *udev_device</code></em>);
  69 struct <a class="link" href="libudev-udev-list.html#udev-list-entry" title="struct udev_list_entry"><span class="returnvalue">udev_list_entry</span></a> * <a class="link" href="libudev-udev-device.html#udev-device-get-devlinks-list-entry" title="udev_device_get_devlinks_list_entry ()">udev_device_get_devlinks_list_entry</a>
  70                                                         (<em class="parameter"><code><span class="type">struct udev_device</span> *udev_device</code></em>);
  71 struct <a class="link" href="libudev-udev-list.html#udev-list-entry" title="struct udev_list_entry"><span class="returnvalue">udev_list_entry</span></a> * <a class="link" href="libudev-udev-device.html#udev-device-get-properties-list-entry" title="udev_device_get_properties_list_entry ()">udev_device_get_properties_list_entry</a>
  72                                                         (<em class="parameter"><code><span class="type">struct udev_device</span> *udev_device</code></em>);
  73 struct <a class="link" href="libudev-udev-list.html#udev-list-entry" title="struct udev_list_entry"><span class="returnvalue">udev_list_entry</span></a> * <a class="link" href="libudev-udev-device.html#udev-device-get-tags-list-entry" title="udev_device_get_tags_list_entry ()">udev_device_get_tags_list_entry</a>
  74                                                         (<em class="parameter"><code><span class="type">struct udev_device</span> *udev_device</code></em>);
  75 const <span class="returnvalue">char</span> *        <a class="link" href="libudev-udev-device.html#udev-device-get-property-value" title="udev_device_get_property_value ()">udev_device_get_property_value</a>      (<em class="parameter"><code><span class="type">struct udev_device</span> *udev_device</code></em>,
  76                                                          <em class="parameter"><code>const <span class="type">char</span> *key</code></em>);
  77 const <span class="returnvalue">char</span> *        <a class="link" href="libudev-udev-device.html#udev-device-get-driver" title="udev_device_get_driver ()">udev_device_get_driver</a>              (<em class="parameter"><code><span class="type">struct udev_device</span> *udev_device</code></em>);
  78 <span class="returnvalue">dev_t</span>               <a class="link" href="libudev-udev-device.html#udev-device-get-devnum" title="udev_device_get_devnum ()">udev_device_get_devnum</a>              (<em class="parameter"><code><span class="type">struct udev_device</span> *udev_device</code></em>);
  79 const <span class="returnvalue">char</span> *        <a class="link" href="libudev-udev-device.html#udev-device-get-action" title="udev_device_get_action ()">udev_device_get_action</a>              (<em class="parameter"><code><span class="type">struct udev_device</span> *udev_device</code></em>);
  80 const <span class="returnvalue">char</span> *        <a class="link" href="libudev-udev-device.html#udev-device-get-sysattr-value" title="udev_device_get_sysattr_value ()">udev_device_get_sysattr_value</a>       (<em class="parameter"><code><span class="type">struct udev_device</span> *udev_device</code></em>,
  81                                                          <em class="parameter"><code>const <span class="type">char</span> *sysattr</code></em>);
  82 <span class="returnvalue">int</span>                 <a class="link" href="libudev-udev-device.html#udev-device-set-sysattr-value" title="udev_device_set_sysattr_value ()">udev_device_set_sysattr_value</a>       (<em class="parameter"><code><span class="type">struct udev_device</span> *udev_device</code></em>,
  83                                                          <em class="parameter"><code>const <span class="type">char</span> *sysattr</code></em>,
  84                                                          <em class="parameter"><code><span class="type">char</span> *value</code></em>);
  85 struct <a class="link" href="libudev-udev-list.html#udev-list-entry" title="struct udev_list_entry"><span class="returnvalue">udev_list_entry</span></a> * <a class="link" href="libudev-udev-device.html#udev-device-get-sysattr-list-entry" title="udev_device_get_sysattr_list_entry ()">udev_device_get_sysattr_list_entry</a>
  86                                                         (<em class="parameter"><code><span class="type">struct udev_device</span> *udev_device</code></em>);
  87 unsigned long long <span class="returnvalue">int</span> <a class="link" href="libudev-udev-device.html#udev-device-get-seqnum" title="udev_device_get_seqnum ()">udev_device_get_seqnum</a>           (<em class="parameter"><code><span class="type">struct udev_device</span> *udev_device</code></em>);
  88 unsigned long long <span class="returnvalue">int</span> <a class="link" href="libudev-udev-device.html#udev-device-get-usec-since-initialized" title="udev_device_get_usec_since_initialized ()">udev_device_get_usec_since_initialized</a>
  89                                                         (<em class="parameter"><code><span class="type">struct udev_device</span> *udev_device</code></em>);
  90 <span class="returnvalue">int</span>                 <a class="link" href="libudev-udev-device.html#udev-device-has-tag" title="udev_device_has_tag ()">udev_device_has_tag</a>                 (<em class="parameter"><code><span class="type">struct udev_device</span> *udev_device</code></em>,
  91                                                          <em class="parameter"><code>const <span class="type">char</span> *tag</code></em>);
  92 </pre>
  93 </div>
  94 <div class="refsect1">
  95 <a name="libudev-udev-device.description"></a><h2>Description</h2>
  96 <p>
  97 Representation of kernel sys devices. Devices are uniquely identified
  98 by their syspath, every device has exactly one path in the kernel sys
  99 filesystem. Devices usually belong to a kernel subsystem, and and have
 100 a unique name inside that subsystem.
 101 </p>
 102 </div>
 103 <div class="refsect1">
 104 <a name="libudev-udev-device.details"></a><h2>Details</h2>
 105 <div class="refsect2">
 106 <a name="udev-device"></a><h3>struct udev_device</h3>
 107 <pre class="programlisting">struct udev_device;</pre>
 108 <p>
 109 Opaque object representing one kernel sys device.
 110 </p>
 111 </div>
 112 <hr>
 113 <div class="refsect2">
 114 <a name="udev-device-ref"></a><h3>udev_device_ref ()</h3>
 115 <pre class="programlisting">struct <a class="link" href="libudev-udev-device.html#udev-device" title="struct udev_device"><span class="returnvalue">udev_device</span></a> * udev_device_ref                    (<em class="parameter"><code><span class="type">struct udev_device</span> *udev_device</code></em>);</pre>
 116 <p>
 117 Take a reference of a udev device.
 118 </p>
 119 <div class="variablelist"><table border="0" class="variablelist">
 120 <colgroup>
 121 <col align="left" valign="top">
 122 <col>
 123 </colgroup>
 124 <tbody>
 125 <tr>
 126 <td><p><span class="term"><em class="parameter"><code>udev_device</code></em> :</span></p></td>
 127 <td>udev device</td>
 128 </tr>
 129 <tr>
 130 <td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
 131 <td>the passed udev device</td>
 132 </tr>
 133 </tbody>
 134 </table></div>
 135 </div>
 136 <hr>
 137 <div class="refsect2">
 138 <a name="udev-device-unref"></a><h3>udev_device_unref ()</h3>
 139 <pre class="programlisting">struct <a class="link" href="libudev-udev-device.html#udev-device" title="struct udev_device"><span class="returnvalue">udev_device</span></a> * udev_device_unref                  (<em class="parameter"><code><span class="type">struct udev_device</span> *udev_device</code></em>);</pre>
 140 <p>
 141 Drop a reference of a udev device. If the refcount reaches zero,
 142 the resources of the device will be released.
 143 </p>
 144 <div class="variablelist"><table border="0" class="variablelist">
 145 <colgroup>
 146 <col align="left" valign="top">
 147 <col>
 148 </colgroup>
 149 <tbody>
 150 <tr>
 151 <td><p><span class="term"><em class="parameter"><code>udev_device</code></em> :</span></p></td>
 152 <td>udev device</td>
 153 </tr>
 154 <tr>
 155 <td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
 156 <td>the passed udev device if it has still an active reference, or <span class="type">NULL</span> otherwise.</td>
 157 </tr>
 158 </tbody>
 159 </table></div>
 160 </div>
 161 <hr>
 162 <div class="refsect2">
 163 <a name="udev-device-get-udev"></a><h3>udev_device_get_udev ()</h3>
 164 <pre class="programlisting">struct <a class="link" href="libudev-udev.html#udev" title="struct udev"><span class="returnvalue">udev</span></a> *       udev_device_get_udev                (<em class="parameter"><code><span class="type">struct udev_device</span> *udev_device</code></em>);</pre>
 165 <p>
 166 Retrieve the udev library context the device was created with.
 167 </p>
 168 <div class="variablelist"><table border="0" class="variablelist">
 169 <colgroup>
 170 <col align="left" valign="top">
 171 <col>
 172 </colgroup>
 173 <tbody>
 174 <tr>
 175 <td><p><span class="term"><em class="parameter"><code>udev_device</code></em> :</span></p></td>
 176 <td>udev device</td>
 177 </tr>
 178 <tr>
 179 <td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
 180 <td>the udev library context</td>
 181 </tr>
 182 </tbody>
 183 </table></div>
 184 </div>
 185 <hr>
 186 <div class="refsect2">
 187 <a name="udev-device-new-from-syspath"></a><h3>udev_device_new_from_syspath ()</h3>
 188 <pre class="programlisting">struct <a class="link" href="libudev-udev-device.html#udev-device" title="struct udev_device"><span class="returnvalue">udev_device</span></a> * udev_device_new_from_syspath       (<em class="parameter"><code><span class="type">struct udev</span> *udev</code></em>,
 189                                                          <em class="parameter"><code>const <span class="type">char</span> *syspath</code></em>);</pre>
 190 <p>
 191 Create new udev device, and fill in information from the sys
 192 device and the udev database entry. The syspath is the absolute
 193 path to the device, including the sys mount point.
 194 </p>
 195 <p>
 196 The initial refcount is 1, and needs to be decremented to
 197 release the resources of the udev device.
 198 </p>
 199 <div class="variablelist"><table border="0" class="variablelist">
 200 <colgroup>
 201 <col align="left" valign="top">
 202 <col>
 203 </colgroup>
 204 <tbody>
 205 <tr>
 206 <td><p><span class="term"><em class="parameter"><code>udev</code></em> :</span></p></td>
 207 <td>udev library context</td>
 208 </tr>
 209 <tr>
 210 <td><p><span class="term"><em class="parameter"><code>syspath</code></em> :</span></p></td>
 211 <td>sys device path including sys directory</td>
 212 </tr>
 213 <tr>
 214 <td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
 215 <td>a new udev device, or <span class="type">NULL</span>, if it does not exist</td>
 216 </tr>
 217 </tbody>
 218 </table></div>
 219 </div>
 220 <hr>
 221 <div class="refsect2">
 222 <a name="udev-device-new-from-devnum"></a><h3>udev_device_new_from_devnum ()</h3>
 223 <pre class="programlisting">struct <a class="link" href="libudev-udev-device.html#udev-device" title="struct udev_device"><span class="returnvalue">udev_device</span></a> * udev_device_new_from_devnum        (<em class="parameter"><code><span class="type">struct udev</span> *udev</code></em>,
 224                                                          <em class="parameter"><code><span class="type">char</span> type</code></em>,
 225                                                          <em class="parameter"><code><span class="type">dev_t</span> devnum</code></em>);</pre>
 226 <p>
 227 Create new udev device, and fill in information from the sys
 228 device and the udev database entry. The device is looked-up
 229 by its major/minor number and type. Character and block device
 230 numbers are not unique across the two types.
 231 </p>
 232 <p>
 233 The initial refcount is 1, and needs to be decremented to
 234 release the resources of the udev device.
 235 </p>
 236 <div class="variablelist"><table border="0" class="variablelist">
 237 <colgroup>
 238 <col align="left" valign="top">
 239 <col>
 240 </colgroup>
 241 <tbody>
 242 <tr>
 243 <td><p><span class="term"><em class="parameter"><code>udev</code></em> :</span></p></td>
 244 <td>udev library context</td>
 245 </tr>
 246 <tr>
 247 <td><p><span class="term"><em class="parameter"><code>type</code></em> :</span></p></td>
 248 <td>char or block device</td>
 249 </tr>
 250 <tr>
 251 <td><p><span class="term"><em class="parameter"><code>devnum</code></em> :</span></p></td>
 252 <td>device major/minor number</td>
 253 </tr>
 254 <tr>
 255 <td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
 256 <td>a new udev device, or <span class="type">NULL</span>, if it does not exist</td>
 257 </tr>
 258 </tbody>
 259 </table></div>
 260 </div>
 261 <hr>
 262 <div class="refsect2">
 263 <a name="udev-device-new-from-subsystem-sysname"></a><h3>udev_device_new_from_subsystem_sysname ()</h3>
 264 <pre class="programlisting">struct <a class="link" href="libudev-udev-device.html#udev-device" title="struct udev_device"><span class="returnvalue">udev_device</span></a> * udev_device_new_from_subsystem_sysname
 265                                                         (<em class="parameter"><code><span class="type">struct udev</span> *udev</code></em>,
 266                                                          <em class="parameter"><code>const <span class="type">char</span> *subsystem</code></em>,
 267                                                          <em class="parameter"><code>const <span class="type">char</span> *sysname</code></em>);</pre>
 268 <p>
 269 Create new udev device, and fill in information from the sys device
 270 and the udev database entry. The device is looked up by the subsystem
 271 and name string of the device, like "mem" / "zero", or "block" / "sda".
 272 </p>
 273 <p>
 274 The initial refcount is 1, and needs to be decremented to
 275 release the resources of the udev device.
 276 </p>
 277 <div class="variablelist"><table border="0" class="variablelist">
 278 <colgroup>
 279 <col align="left" valign="top">
 280 <col>
 281 </colgroup>
 282 <tbody>
 283 <tr>
 284 <td><p><span class="term"><em class="parameter"><code>udev</code></em> :</span></p></td>
 285 <td>udev library context</td>
 286 </tr>
 287 <tr>
 288 <td><p><span class="term"><em class="parameter"><code>subsystem</code></em> :</span></p></td>
 289 <td>the subsystem of the device</td>
 290 </tr>
 291 <tr>
 292 <td><p><span class="term"><em class="parameter"><code>sysname</code></em> :</span></p></td>
 293 <td>the name of the device</td>
 294 </tr>
 295 <tr>
 296 <td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
 297 <td>a new udev device, or <span class="type">NULL</span>, if it does not exist</td>
 298 </tr>
 299 </tbody>
 300 </table></div>
 301 </div>
 302 <hr>
 303 <div class="refsect2">
 304 <a name="udev-device-new-from-device-id"></a><h3>udev_device_new_from_device_id ()</h3>
 305 <pre class="programlisting">struct <a class="link" href="libudev-udev-device.html#udev-device" title="struct udev_device"><span class="returnvalue">udev_device</span></a> * udev_device_new_from_device_id     (<em class="parameter"><code><span class="type">struct udev</span> *udev</code></em>,
 306                                                          <em class="parameter"><code><span class="type">char</span> *id</code></em>);</pre>
 307 <p>
 308 Create new udev device, and fill in information from the sys
 309 device and the udev database entry. The device is looked-up
 310 by a special string:
 311   b8:2          - block device major:minor
 312   c128:1        - char device major:minor
 313   n3            - network device ifindex
 314   +sound:card29 - kernel driver core subsystem:device name
 315 </p>
 316 <p>
 317 The initial refcount is 1, and needs to be decremented to
 318 release the resources of the udev device.
 319 </p>
 320 <div class="variablelist"><table border="0" class="variablelist">
 321 <colgroup>
 322 <col align="left" valign="top">
 323 <col>
 324 </colgroup>
 325 <tbody>
 326 <tr>
 327 <td><p><span class="term"><em class="parameter"><code>udev</code></em> :</span></p></td>
 328 <td>udev library context</td>
 329 </tr>
 330 <tr>
 331 <td><p><span class="term"><em class="parameter"><code>id</code></em> :</span></p></td>
 332 <td>text string identifying a kernel device</td>
 333 </tr>
 334 <tr>
 335 <td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
 336 <td>a new udev device, or <span class="type">NULL</span>, if it does not exist</td>
 337 </tr>
 338 </tbody>
 339 </table></div>
 340 </div>
 341 <hr>
 342 <div class="refsect2">
 343 <a name="udev-device-new-from-environment"></a><h3>udev_device_new_from_environment ()</h3>
 344 <pre class="programlisting">struct <a class="link" href="libudev-udev-device.html#udev-device" title="struct udev_device"><span class="returnvalue">udev_device</span></a> * udev_device_new_from_environment   (<em class="parameter"><code><span class="type">struct udev</span> *udev</code></em>);</pre>
 345 <p>
 346 Create new udev device, and fill in information from the
 347 current process environment. This only works reliable if
 348 the process is called from a udev rule. It is usually used
 349 for tools executed from IMPORT= rules.
 350 </p>
 351 <p>
 352 The initial refcount is 1, and needs to be decremented to
 353 release the resources of the udev device.
 354 </p>
 355 <div class="variablelist"><table border="0" class="variablelist">
 356 <colgroup>
 357 <col align="left" valign="top">
 358 <col>
 359 </colgroup>
 360 <tbody>
 361 <tr>
 362 <td><p><span class="term"><em class="parameter"><code>udev</code></em> :</span></p></td>
 363 <td>udev library context</td>
 364 </tr>
 365 <tr>
 366 <td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
 367 <td>a new udev device, or <span class="type">NULL</span>, if it does not exist</td>
 368 </tr>
 369 </tbody>
 370 </table></div>
 371 </div>
 372 <hr>
 373 <div class="refsect2">
 374 <a name="udev-device-get-parent"></a><h3>udev_device_get_parent ()</h3>
 375 <pre class="programlisting">struct <a class="link" href="libudev-udev-device.html#udev-device" title="struct udev_device"><span class="returnvalue">udev_device</span></a> * udev_device_get_parent             (<em class="parameter"><code><span class="type">struct udev_device</span> *udev_device</code></em>);</pre>
 376 <p>
 377 Find the next parent device, and fill in information from the sys
 378 device and the udev database entry.
 379 </p>
 380 <p>
 381 The returned the device is not referenced. It is attached to the
 382 child device, and will be cleaned up when the child device
 383 is cleaned up.
 384 </p>
 385 <p>
 386 It is not necessarily just the upper level directory, empty or not
 387 recognized sys directories are ignored.
 388 </p>
 389 <p>
 390 It can be called as many times as needed, without caring about
 391 references.
 392 </p>
 393 <div class="variablelist"><table border="0" class="variablelist">
 394 <colgroup>
 395 <col align="left" valign="top">
 396 <col>
 397 </colgroup>
 398 <tbody>
 399 <tr>
 400 <td><p><span class="term"><em class="parameter"><code>udev_device</code></em> :</span></p></td>
 401 <td>the device to start searching from</td>
 402 </tr>
 403 <tr>
 404 <td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
 405 <td>a new udev device, or <span class="type">NULL</span>, if it no parent exist.</td>
 406 </tr>
 407 </tbody>
 408 </table></div>
 409 </div>
 410 <hr>
 411 <div class="refsect2">
 412 <a name="udev-device-get-parent-with-subsystem-devtype"></a><h3>udev_device_get_parent_with_subsystem_devtype ()</h3>
 413 <pre class="programlisting">struct <a class="link" href="libudev-udev-device.html#udev-device" title="struct udev_device"><span class="returnvalue">udev_device</span></a> * udev_device_get_parent_with_subsystem_devtype
 414                                                         (<em class="parameter"><code><span class="type">struct udev_device</span> *udev_device</code></em>,
 415                                                          <em class="parameter"><code>const <span class="type">char</span> *subsystem</code></em>,
 416                                                          <em class="parameter"><code>const <span class="type">char</span> *devtype</code></em>);</pre>
 417 <p>
 418 Find the next parent device, with a matching subsystem and devtype
 419 value, and fill in information from the sys device and the udev
 420 database entry.
 421 </p>
 422 <p>
 423 If devtype is <span class="type">NULL</span>, only subsystem is checked, and any devtype will
 424 match.
 425 </p>
 426 <p>
 427 The returned the device is not referenced. It is attached to the
 428 child device, and will be cleaned up when the child device
 429 is cleaned up.
 430 </p>
 431 <p>
 432 It can be called as many times as needed, without caring about
 433 references.
 434 </p>
 435 <div class="variablelist"><table border="0" class="variablelist">
 436 <colgroup>
 437 <col align="left" valign="top">
 438 <col>
 439 </colgroup>
 440 <tbody>
 441 <tr>
 442 <td><p><span class="term"><em class="parameter"><code>udev_device</code></em> :</span></p></td>
 443 <td>udev device to start searching from</td>
 444 </tr>
 445 <tr>
 446 <td><p><span class="term"><em class="parameter"><code>subsystem</code></em> :</span></p></td>
 447 <td>the subsystem of the device</td>
 448 </tr>
 449 <tr>
 450 <td><p><span class="term"><em class="parameter"><code>devtype</code></em> :</span></p></td>
 451 <td>the type (DEVTYPE) of the device</td>
 452 </tr>
 453 <tr>
 454 <td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
 455 <td>a new udev device, or <span class="type">NULL</span> if no matching parent exists.</td>
 456 </tr>
 457 </tbody>
 458 </table></div>
 459 </div>
 460 <hr>
 461 <div class="refsect2">
 462 <a name="udev-device-get-devpath"></a><h3>udev_device_get_devpath ()</h3>
 463 <pre class="programlisting">const <span class="returnvalue">char</span> *        udev_device_get_devpath             (<em class="parameter"><code><span class="type">struct udev_device</span> *udev_device</code></em>);</pre>
 464 <p>
 465 Retrieve the kernel devpath value of the udev device. The path
 466 does not contain the sys mount point, and starts with a '/'.
 467 </p>
 468 <div class="variablelist"><table border="0" class="variablelist">
 469 <colgroup>
 470 <col align="left" valign="top">
 471 <col>
 472 </colgroup>
 473 <tbody>
 474 <tr>
 475 <td><p><span class="term"><em class="parameter"><code>udev_device</code></em> :</span></p></td>
 476 <td>udev device</td>
 477 </tr>
 478 <tr>
 479 <td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
 480 <td>the devpath of the udev device</td>
 481 </tr>
 482 </tbody>
 483 </table></div>
 484 </div>
 485 <hr>
 486 <div class="refsect2">
 487 <a name="udev-device-get-subsystem"></a><h3>udev_device_get_subsystem ()</h3>
 488 <pre class="programlisting">const <span class="returnvalue">char</span> *        udev_device_get_subsystem           (<em class="parameter"><code><span class="type">struct udev_device</span> *udev_device</code></em>);</pre>
 489 <p>
 490 Retrieve the subsystem string of the udev device. The string does not
 491 contain any "/".
 492 </p>
 493 <div class="variablelist"><table border="0" class="variablelist">
 494 <colgroup>
 495 <col align="left" valign="top">
 496 <col>
 497 </colgroup>
 498 <tbody>
 499 <tr>
 500 <td><p><span class="term"><em class="parameter"><code>udev_device</code></em> :</span></p></td>
 501 <td>udev device</td>
 502 </tr>
 503 <tr>
 504 <td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
 505 <td>the subsystem name of the udev device, or <span class="type">NULL</span> if it can not be determined</td>
 506 </tr>
 507 </tbody>
 508 </table></div>
 509 </div>
 510 <hr>
 511 <div class="refsect2">
 512 <a name="udev-device-get-devtype"></a><h3>udev_device_get_devtype ()</h3>
 513 <pre class="programlisting">const <span class="returnvalue">char</span> *        udev_device_get_devtype             (<em class="parameter"><code><span class="type">struct udev_device</span> *udev_device</code></em>);</pre>
 514 <p>
 515 Retrieve the devtype string of the udev device.
 516 </p>
 517 <div class="variablelist"><table border="0" class="variablelist">
 518 <colgroup>
 519 <col align="left" valign="top">
 520 <col>
 521 </colgroup>
 522 <tbody>
 523 <tr>
 524 <td><p><span class="term"><em class="parameter"><code>udev_device</code></em> :</span></p></td>
 525 <td>udev device</td>
 526 </tr>
 527 <tr>
 528 <td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
 529 <td>the devtype name of the udev device, or <span class="type">NULL</span> if it can not be determined</td>
 530 </tr>
 531 </tbody>
 532 </table></div>
 533 </div>
 534 <hr>
 535 <div class="refsect2">
 536 <a name="udev-device-get-syspath"></a><h3>udev_device_get_syspath ()</h3>
 537 <pre class="programlisting">const <span class="returnvalue">char</span> *        udev_device_get_syspath             (<em class="parameter"><code><span class="type">struct udev_device</span> *udev_device</code></em>);</pre>
 538 <p>
 539 Retrieve the sys path of the udev device. The path is an
 540 absolute path and starts with the sys mount point.
 541 </p>
 542 <div class="variablelist"><table border="0" class="variablelist">
 543 <colgroup>
 544 <col align="left" valign="top">
 545 <col>
 546 </colgroup>
 547 <tbody>
 548 <tr>
 549 <td><p><span class="term"><em class="parameter"><code>udev_device</code></em> :</span></p></td>
 550 <td>udev device</td>
 551 </tr>
 552 <tr>
 553 <td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
 554 <td>the sys path of the udev device</td>
 555 </tr>
 556 </tbody>
 557 </table></div>
 558 </div>
 559 <hr>
 560 <div class="refsect2">
 561 <a name="udev-device-get-sysname"></a><h3>udev_device_get_sysname ()</h3>
 562 <pre class="programlisting">const <span class="returnvalue">char</span> *        udev_device_get_sysname             (<em class="parameter"><code><span class="type">struct udev_device</span> *udev_device</code></em>);</pre>
 563 <p>
 564 Get the kernel device name in /sys.
 565 </p>
 566 <div class="variablelist"><table border="0" class="variablelist">
 567 <colgroup>
 568 <col align="left" valign="top">
 569 <col>
 570 </colgroup>
 571 <tbody>
 572 <tr>
 573 <td><p><span class="term"><em class="parameter"><code>udev_device</code></em> :</span></p></td>
 574 <td>udev device</td>
 575 </tr>
 576 <tr>
 577 <td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
 578 <td>the name string of the device device</td>
 579 </tr>
 580 </tbody>
 581 </table></div>
 582 </div>
 583 <hr>
 584 <div class="refsect2">
 585 <a name="udev-device-get-sysnum"></a><h3>udev_device_get_sysnum ()</h3>
 586 <pre class="programlisting">const <span class="returnvalue">char</span> *        udev_device_get_sysnum              (<em class="parameter"><code><span class="type">struct udev_device</span> *udev_device</code></em>);</pre>
 587 <p>
 588 Get the instance number of the device.
 589 </p>
 590 <div class="variablelist"><table border="0" class="variablelist">
 591 <colgroup>
 592 <col align="left" valign="top">
 593 <col>
 594 </colgroup>
 595 <tbody>
 596 <tr>
 597 <td><p><span class="term"><em class="parameter"><code>udev_device</code></em> :</span></p></td>
 598 <td>udev device</td>
 599 </tr>
 600 <tr>
 601 <td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
 602 <td>the trailing number string of the device name</td>
 603 </tr>
 604 </tbody>
 605 </table></div>
 606 </div>
 607 <hr>
 608 <div class="refsect2">
 609 <a name="udev-device-get-devnode"></a><h3>udev_device_get_devnode ()</h3>
 610 <pre class="programlisting">const <span class="returnvalue">char</span> *        udev_device_get_devnode             (<em class="parameter"><code><span class="type">struct udev_device</span> *udev_device</code></em>);</pre>
 611 <p>
 612 Retrieve the device node file name belonging to the udev device.
 613 The path is an absolute path, and starts with the device directory.
 614 </p>
 615 <div class="variablelist"><table border="0" class="variablelist">
 616 <colgroup>
 617 <col align="left" valign="top">
 618 <col>
 619 </colgroup>
 620 <tbody>
 621 <tr>
 622 <td><p><span class="term"><em class="parameter"><code>udev_device</code></em> :</span></p></td>
 623 <td>udev device</td>
 624 </tr>
 625 <tr>
 626 <td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
 627 <td>the device node file name of the udev device, or <span class="type">NULL</span> if no device node exists</td>
 628 </tr>
 629 </tbody>
 630 </table></div>
 631 </div>
 632 <hr>
 633 <div class="refsect2">
 634 <a name="udev-device-get-is-initialized"></a><h3>udev_device_get_is_initialized ()</h3>
 635 <pre class="programlisting"><span class="returnvalue">int</span>                 udev_device_get_is_initialized      (<em class="parameter"><code><span class="type">struct udev_device</span> *udev_device</code></em>);</pre>
 636 <p>
 637 Check if udev has already handled the device and has set up
 638 device node permissions and context, or has renamed a network
 639 device.
 640 </p>
 641 <p>
 642 This is only implemented for devices with a device node
 643 or network interfaces. All other devices return 1 here.
 644 </p>
 645 <div class="variablelist"><table border="0" class="variablelist">
 646 <colgroup>
 647 <col align="left" valign="top">
 648 <col>
 649 </colgroup>
 650 <tbody>
 651 <tr>
 652 <td><p><span class="term"><em class="parameter"><code>udev_device</code></em> :</span></p></td>
 653 <td>udev device</td>
 654 </tr>
 655 <tr>
 656 <td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
 657 <td>1 if the device is set up. 0 otherwise.</td>
 658 </tr>
 659 </tbody>
 660 </table></div>
 661 </div>
 662 <hr>
 663 <div class="refsect2">
 664 <a name="udev-device-get-devlinks-list-entry"></a><h3>udev_device_get_devlinks_list_entry ()</h3>
 665 <pre class="programlisting">struct <a class="link" href="libudev-udev-list.html#udev-list-entry" title="struct udev_list_entry"><span class="returnvalue">udev_list_entry</span></a> * udev_device_get_devlinks_list_entry
 666                                                         (<em class="parameter"><code><span class="type">struct udev_device</span> *udev_device</code></em>);</pre>
 667 <p>
 668 Retrieve the list of device links pointing to the device file of
 669 the udev device. The next list entry can be retrieved with
 670 <a class="link" href="libudev-udev-list.html#udev-list-entry-get-next" title="udev_list_entry_get_next ()"><code class="function">udev_list_entry_get_next()</code></a>, which returns <span class="type">NULL</span> if no more entries exist.
 671 The devlink path can be retrieved from the list entry by
 672 <a class="link" href="libudev-udev-list.html#udev-list-entry-get-name" title="udev_list_entry_get_name ()"><code class="function">udev_list_entry_get_name()</code></a>. The path is an absolute path, and starts with
 673 the device directory.
 674 </p>
 675 <div class="variablelist"><table border="0" class="variablelist">
 676 <colgroup>
 677 <col align="left" valign="top">
 678 <col>
 679 </colgroup>
 680 <tbody>
 681 <tr>
 682 <td><p><span class="term"><em class="parameter"><code>udev_device</code></em> :</span></p></td>
 683 <td>udev device</td>
 684 </tr>
 685 <tr>
 686 <td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
 687 <td>the first entry of the device node link list</td>
 688 </tr>
 689 </tbody>
 690 </table></div>
 691 </div>
 692 <hr>
 693 <div class="refsect2">
 694 <a name="udev-device-get-properties-list-entry"></a><h3>udev_device_get_properties_list_entry ()</h3>
 695 <pre class="programlisting">struct <a class="link" href="libudev-udev-list.html#udev-list-entry" title="struct udev_list_entry"><span class="returnvalue">udev_list_entry</span></a> * udev_device_get_properties_list_entry
 696                                                         (<em class="parameter"><code><span class="type">struct udev_device</span> *udev_device</code></em>);</pre>
 697 <p>
 698 Retrieve the list of key/value device properties of the udev
 699 device. The next list entry can be retrieved with <a class="link" href="libudev-udev-list.html#udev-list-entry-get-next" title="udev_list_entry_get_next ()"><code class="function">udev_list_entry_get_next()</code></a>,
 700 which returns <span class="type">NULL</span> if no more entries exist. The property name
 701 can be retrieved from the list entry by <a class="link" href="libudev-udev-list.html#udev-list-entry-get-name" title="udev_list_entry_get_name ()"><code class="function">udev_list_entry_get_name()</code></a>,
 702 the property value by <a class="link" href="libudev-udev-list.html#udev-list-entry-get-value" title="udev_list_entry_get_value ()"><code class="function">udev_list_entry_get_value()</code></a>.
 703 </p>
 704 <div class="variablelist"><table border="0" class="variablelist">
 705 <colgroup>
 706 <col align="left" valign="top">
 707 <col>
 708 </colgroup>
 709 <tbody>
 710 <tr>
 711 <td><p><span class="term"><em class="parameter"><code>udev_device</code></em> :</span></p></td>
 712 <td>udev device</td>
 713 </tr>
 714 <tr>
 715 <td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
 716 <td>the first entry of the property list</td>
 717 </tr>
 718 </tbody>
 719 </table></div>
 720 </div>
 721 <hr>
 722 <div class="refsect2">
 723 <a name="udev-device-get-tags-list-entry"></a><h3>udev_device_get_tags_list_entry ()</h3>
 724 <pre class="programlisting">struct <a class="link" href="libudev-udev-list.html#udev-list-entry" title="struct udev_list_entry"><span class="returnvalue">udev_list_entry</span></a> * udev_device_get_tags_list_entry
 725                                                         (<em class="parameter"><code><span class="type">struct udev_device</span> *udev_device</code></em>);</pre>
 726 <p>
 727 Retrieve the list of tags attached to the udev device. The next
 728 list entry can be retrieved with <a class="link" href="libudev-udev-list.html#udev-list-entry-get-next" title="udev_list_entry_get_next ()"><code class="function">udev_list_entry_get_next()</code></a>,
 729 which returns <span class="type">NULL</span> if no more entries exist. The tag string
 730 can be retrieved from the list entry by <a class="link" href="libudev-udev-list.html#udev-list-entry-get-name" title="udev_list_entry_get_name ()"><code class="function">udev_list_entry_get_name()</code></a>.
 731 </p>
 732 <div class="variablelist"><table border="0" class="variablelist">
 733 <colgroup>
 734 <col align="left" valign="top">
 735 <col>
 736 </colgroup>
 737 <tbody>
 738 <tr>
 739 <td><p><span class="term"><em class="parameter"><code>udev_device</code></em> :</span></p></td>
 740 <td>udev device</td>
 741 </tr>
 742 <tr>
 743 <td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
 744 <td>the first entry of the tag list</td>
 745 </tr>
 746 </tbody>
 747 </table></div>
 748 </div>
 749 <hr>
 750 <div class="refsect2">
 751 <a name="udev-device-get-property-value"></a><h3>udev_device_get_property_value ()</h3>
 752 <pre class="programlisting">const <span class="returnvalue">char</span> *        udev_device_get_property_value      (<em class="parameter"><code><span class="type">struct udev_device</span> *udev_device</code></em>,
 753                                                          <em class="parameter"><code>const <span class="type">char</span> *key</code></em>);</pre>
 754 <p>
 755 Get the value of a given property.
 756 </p>
 757 <div class="variablelist"><table border="0" class="variablelist">
 758 <colgroup>
 759 <col align="left" valign="top">
 760 <col>
 761 </colgroup>
 762 <tbody>
 763 <tr>
 764 <td><p><span class="term"><em class="parameter"><code>udev_device</code></em> :</span></p></td>
 765 <td>udev device</td>
 766 </tr>
 767 <tr>
 768 <td><p><span class="term"><em class="parameter"><code>key</code></em> :</span></p></td>
 769 <td>property name</td>
 770 </tr>
 771 <tr>
 772 <td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
 773 <td>the property string, or <span class="type">NULL</span> if there is no such property.</td>
 774 </tr>
 775 </tbody>
 776 </table></div>
 777 </div>
 778 <hr>
 779 <div class="refsect2">
 780 <a name="udev-device-get-driver"></a><h3>udev_device_get_driver ()</h3>
 781 <pre class="programlisting">const <span class="returnvalue">char</span> *        udev_device_get_driver              (<em class="parameter"><code><span class="type">struct udev_device</span> *udev_device</code></em>);</pre>
 782 <p>
 783 Get the kernel driver name.
 784 </p>
 785 <div class="variablelist"><table border="0" class="variablelist">
 786 <colgroup>
 787 <col align="left" valign="top">
 788 <col>
 789 </colgroup>
 790 <tbody>
 791 <tr>
 792 <td><p><span class="term"><em class="parameter"><code>udev_device</code></em> :</span></p></td>
 793 <td>udev device</td>
 794 </tr>
 795 <tr>
 796 <td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
 797 <td>the driver name string, or <span class="type">NULL</span> if there is no driver attached.</td>
 798 </tr>
 799 </tbody>
 800 </table></div>
 801 </div>
 802 <hr>
 803 <div class="refsect2">
 804 <a name="udev-device-get-devnum"></a><h3>udev_device_get_devnum ()</h3>
 805 <pre class="programlisting"><span class="returnvalue">dev_t</span>               udev_device_get_devnum              (<em class="parameter"><code><span class="type">struct udev_device</span> *udev_device</code></em>);</pre>
 806 <p>
 807 Get the device major/minor number.
 808 </p>
 809 <div class="variablelist"><table border="0" class="variablelist">
 810 <colgroup>
 811 <col align="left" valign="top">
 812 <col>
 813 </colgroup>
 814 <tbody>
 815 <tr>
 816 <td><p><span class="term"><em class="parameter"><code>udev_device</code></em> :</span></p></td>
 817 <td>udev device</td>
 818 </tr>
 819 <tr>
 820 <td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
 821 <td>the dev_t number.</td>
 822 </tr>
 823 </tbody>
 824 </table></div>
 825 </div>
 826 <hr>
 827 <div class="refsect2">
 828 <a name="udev-device-get-action"></a><h3>udev_device_get_action ()</h3>
 829 <pre class="programlisting">const <span class="returnvalue">char</span> *        udev_device_get_action              (<em class="parameter"><code><span class="type">struct udev_device</span> *udev_device</code></em>);</pre>
 830 <p>
 831 This is only valid if the device was received through a monitor. Devices read from
 832 sys do not have an action string. Usual actions are: add, remove, change, online,
 833 offline.
 834 </p>
 835 <div class="variablelist"><table border="0" class="variablelist">
 836 <colgroup>
 837 <col align="left" valign="top">
 838 <col>
 839 </colgroup>
 840 <tbody>
 841 <tr>
 842 <td><p><span class="term"><em class="parameter"><code>udev_device</code></em> :</span></p></td>
 843 <td>udev device</td>
 844 </tr>
 845 <tr>
 846 <td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
 847 <td>the kernel action value, or <span class="type">NULL</span> if there is no action value available.</td>
 848 </tr>
 849 </tbody>
 850 </table></div>
 851 </div>
 852 <hr>
 853 <div class="refsect2">
 854 <a name="udev-device-get-sysattr-value"></a><h3>udev_device_get_sysattr_value ()</h3>
 855 <pre class="programlisting">const <span class="returnvalue">char</span> *        udev_device_get_sysattr_value       (<em class="parameter"><code><span class="type">struct udev_device</span> *udev_device</code></em>,
 856                                                          <em class="parameter"><code>const <span class="type">char</span> *sysattr</code></em>);</pre>
 857 <p>
 858 The retrieved value is cached in the device. Repeated calls will return the same
 859 value and not open the attribute again.
 860 </p>
 861 <div class="variablelist"><table border="0" class="variablelist">
 862 <colgroup>
 863 <col align="left" valign="top">
 864 <col>
 865 </colgroup>
 866 <tbody>
 867 <tr>
 868 <td><p><span class="term"><em class="parameter"><code>udev_device</code></em> :</span></p></td>
 869 <td>udev device</td>
 870 </tr>
 871 <tr>
 872 <td><p><span class="term"><em class="parameter"><code>sysattr</code></em> :</span></p></td>
 873 <td>attribute name</td>
 874 </tr>
 875 <tr>
 876 <td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
 877 <td>the content of a sys attribute file, or <span class="type">NULL</span> if there is no sys attribute value.</td>
 878 </tr>
 879 </tbody>
 880 </table></div>
 881 </div>
 882 <hr>
 883 <div class="refsect2">
 884 <a name="udev-device-set-sysattr-value"></a><h3>udev_device_set_sysattr_value ()</h3>
 885 <pre class="programlisting"><span class="returnvalue">int</span>                 udev_device_set_sysattr_value       (<em class="parameter"><code><span class="type">struct udev_device</span> *udev_device</code></em>,
 886                                                          <em class="parameter"><code>const <span class="type">char</span> *sysattr</code></em>,
 887                                                          <em class="parameter"><code><span class="type">char</span> *value</code></em>);</pre>
 888 <p>
 889 Update the contents of the sys attribute and the cached value of the device.
 890 </p>
 891 <div class="variablelist"><table border="0" class="variablelist">
 892 <colgroup>
 893 <col align="left" valign="top">
 894 <col>
 895 </colgroup>
 896 <tbody>
 897 <tr>
 898 <td><p><span class="term"><em class="parameter"><code>udev_device</code></em> :</span></p></td>
 899 <td>udev device</td>
 900 </tr>
 901 <tr>
 902 <td><p><span class="term"><em class="parameter"><code>sysattr</code></em> :</span></p></td>
 903 <td>attribute name</td>
 904 </tr>
 905 <tr>
 906 <td><p><span class="term"><em class="parameter"><code>value</code></em> :</span></p></td>
 907 <td>new value to be set</td>
 908 </tr>
 909 <tr>
 910 <td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
 911 <td>Negative error code on failure or 0 on success.</td>
 912 </tr>
 913 </tbody>
 914 </table></div>
 915 </div>
 916 <hr>
 917 <div class="refsect2">
 918 <a name="udev-device-get-sysattr-list-entry"></a><h3>udev_device_get_sysattr_list_entry ()</h3>
 919 <pre class="programlisting">struct <a class="link" href="libudev-udev-list.html#udev-list-entry" title="struct udev_list_entry"><span class="returnvalue">udev_list_entry</span></a> * udev_device_get_sysattr_list_entry
 920                                                         (<em class="parameter"><code><span class="type">struct udev_device</span> *udev_device</code></em>);</pre>
 921 <p>
 922 Retrieve the list of available sysattrs, with value being empty;
 923 This just return all available sysfs attributes for a particular
 924 device without reading their values.
 925 </p>
 926 <div class="variablelist"><table border="0" class="variablelist">
 927 <colgroup>
 928 <col align="left" valign="top">
 929 <col>
 930 </colgroup>
 931 <tbody>
 932 <tr>
 933 <td><p><span class="term"><em class="parameter"><code>udev_device</code></em> :</span></p></td>
 934 <td>udev device</td>
 935 </tr>
 936 <tr>
 937 <td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
 938 <td>the first entry of the property list</td>
 939 </tr>
 940 </tbody>
 941 </table></div>
 942 </div>
 943 <hr>
 944 <div class="refsect2">
 945 <a name="udev-device-get-seqnum"></a><h3>udev_device_get_seqnum ()</h3>
 946 <pre class="programlisting">unsigned long long <span class="returnvalue">int</span> udev_device_get_seqnum           (<em class="parameter"><code><span class="type">struct udev_device</span> *udev_device</code></em>);</pre>
 947 <p>
 948 This is only valid if the device was received through a monitor. Devices read from
 949 sys do not have a sequence number.
 950 </p>
 951 <div class="variablelist"><table border="0" class="variablelist">
 952 <colgroup>
 953 <col align="left" valign="top">
 954 <col>
 955 </colgroup>
 956 <tbody>
 957 <tr>
 958 <td><p><span class="term"><em class="parameter"><code>udev_device</code></em> :</span></p></td>
 959 <td>udev device</td>
 960 </tr>
 961 <tr>
 962 <td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
 963 <td>the kernel event sequence number, or 0 if there is no sequence number available.</td>
 964 </tr>
 965 </tbody>
 966 </table></div>
 967 </div>
 968 <hr>
 969 <div class="refsect2">
 970 <a name="udev-device-get-usec-since-initialized"></a><h3>udev_device_get_usec_since_initialized ()</h3>
 971 <pre class="programlisting">unsigned long long <span class="returnvalue">int</span> udev_device_get_usec_since_initialized
 972                                                         (<em class="parameter"><code><span class="type">struct udev_device</span> *udev_device</code></em>);</pre>
 973 <p>
 974 Return the number of microseconds passed since udev set up the
 975 device for the first time.
 976 </p>
 977 <p>
 978 This is only implemented for devices with need to store properties
 979 in the udev database. All other devices return 0 here.
 980 </p>
 981 <div class="variablelist"><table border="0" class="variablelist">
 982 <colgroup>
 983 <col align="left" valign="top">
 984 <col>
 985 </colgroup>
 986 <tbody>
 987 <tr>
 988 <td><p><span class="term"><em class="parameter"><code>udev_device</code></em> :</span></p></td>
 989 <td>udev device</td>
 990 </tr>
 991 <tr>
 992 <td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
 993 <td>the number of microseconds since the device was first seen.</td>
 994 </tr>
 995 </tbody>
 996 </table></div>
 997 </div>
 998 <hr>
 999 <div class="refsect2">
1000 <a name="udev-device-has-tag"></a><h3>udev_device_has_tag ()</h3>
1001 <pre class="programlisting"><span class="returnvalue">int</span>                 udev_device_has_tag                 (<em class="parameter"><code><span class="type">struct udev_device</span> *udev_device</code></em>,
1002                                                          <em class="parameter"><code>const <span class="type">char</span> *tag</code></em>);</pre>
1003 <p>
1004 Check if a given device has a certain tag associated.
1005 </p>
1006 <div class="variablelist"><table border="0" class="variablelist">
1007 <colgroup>
1008 <col align="left" valign="top">
1009 <col>
1010 </colgroup>
1011 <tbody>
1012 <tr>
1013 <td><p><span class="term"><em class="parameter"><code>udev_device</code></em> :</span></p></td>
1014 <td>udev device</td>
1015 </tr>
1016 <tr>
1017 <td><p><span class="term"><em class="parameter"><code>tag</code></em> :</span></p></td>
1018 <td>tag name</td>
1019 </tr>
1020 <tr>
1021 <td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
1022 <td>1 if the tag is found. 0 otherwise.</td>
1023 </tr>
1024 </tbody>
1025 </table></div>
1026 </div>
1027 </div>
1028 </div>
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