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6.58. Udev-056
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Linux From Scratch - Version 6.1
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Chapter 6. 安装系统基础软件
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6.58. Udev-056
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<p>
Udev 软件包包含动态地创建设备节点的程序。</p>
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<strong><span class="segtitle">预计编译时间：</span></strong> <span class="seg">0.1 SBU</span>
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<strong><span class="segtitle">所需磁盘空间：</span></strong> <span class="seg">6.7 MB</span>
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<strong><span class="segtitle">安装依赖于：</span></strong> <span class="seg">Coreutils, Make</span>
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<h2 class="sect2">
6.58.1. 安装 Udev
</h2>
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<p>编译软件包：</p>
<pre class="userinput"><kbd class="command">make udevdir=/dev</kbd></pre>
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<dl>
<dt>
<span class="term"><em class="parameter"><tt>udevdir=/dev</tt></em></span> </dt>
<dd>
<p>
告诉 <span><strong class="command">udev</strong></span>
在哪个目录下去创建设备节点。</p>
</dd>
</dl>
</div>
<p>
要测试结果，请运行： <strong class="userinput"><tt>make test</tt></strong>
</p>
<p>
安装软件包：
</p>
<pre class="userinput"><kbd class="command">make udevdir=/dev install</kbd></pre>
<p>Udev 的默认配置很不完美，所以请在这里安装配置文件：</p>
<pre class="userinput"><kbd class="command">cp ../udev-config-3.rules /etc/udev/rules.d/25-lfs.rules</kbd></pre>
<p>
运行 <span><strong class="command">udevstart</strong></span>
程序以创建我们需要的所有设备节点：</p>
<pre class="userinput"><kbd class="command">/sbin/udevstart</kbd></pre>
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<h2 class="sect2">
6.58.2. Udev 的内容 </h2>
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<strong><span class="segtitle">安装的程序：</span></strong> <span class="seg">udev, udevd, udevsend, udevstart, udevinfo, udevtest</span>
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<strong><span class="segtitle">安装的目录：</span></strong> <span class="seg">/etc/udev</span>
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<h3>
<a id="id3304055" name="id3304055"></a>简要描述</h3>
<table border="0">
<col align="left" valign="top" />
<tbody>
<tr>
<td>
<a id="udev" name="udev"></a><span class="term"><span><strong class="command">udev</strong></span></span>
</td>
<td>
<p>
在 <tt class="filename">/dev</tt> 创建设备节点或者重命名网络接口(不是在LFS)以响应热插拔事件。</p>
</td>
</tr>
<tr>
<td>
<a id="udevd" name="udevd"></a><span class="term"><span><strong class="command">udevd</strong></span></span>
</td>
<td>
<p>
一个守护进程，在向 <span><strong class="command">udev</strong></span>提交之前重新订制热插拔事件，从而避免各种各样的竞争条件。</p>
</td>
</tr>
<tr>
<td>
<a id="udevsend" name="udevsend"></a><span class="term"><span><strong class="command">udevsend</strong></span></span>
</td>
<td>
<p>向<span><strong class="command">udevd</strong></span>传递热插拔事件。
</p>
</td>
</tr>
<tr>
<td>
<a id="udevstart" name="udevstart"></a><span class="term"><span><strong class="command">udevstart</strong></span></span>
</td>
<td>
<p>
在 <tt class="filename">/dev</tt>
目录创建设备节点以与直接编进内核的驱动模块通信，它通过模拟可能被内核在调用这个程序之前丢弃的热插拔事件(比如因为根文件系统尚未挂载)来执行这个任务，并将这些综合的热插拔事件提交给 <span><strong class="command">udev</strong></span> </p>
</td>
</tr>
<tr>
<td>
<a id="udevinfo" name="udevinfo"></a><span class="term"><span><strong class="command">udevinfo</strong></span></span>
</td>
<td>
<p>
允许用户查询 <span><strong class="command">udev</strong></span> 数据库以得到当前这个系统上所有设备的信息，它也提供一种方式去查询任何设备在 <tt class="systemitem">sysfs</tt> 树里去帮助创建Udev规则。</p>
</td>
</tr>
<tr>
<td>
<a id="udevtest" name="udevtest"></a><span class="term"><span><strong class="command">udevtest</strong></span></span>
</td>
<td>
<p>
模拟一个 <span><strong class="command">udev</strong></span>为那些给定的设备,并且打印出真实节点的名称<span><strong class="command">udev</strong></span>可能已经被创建或者(不在LFS中)被重命名的网络接口。</p>
</td>
</tr>
<tr>
<td>
<a id="etc-udev" name="etc-udev"></a><span class="term"><tt class="filename">/etc/udev</tt></span>
</td>
<td>
<p>
包含 <span><strong class="command">udev</strong></span> 配置文件、设备许可、设备命名规则。</p>
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