ipage4.htm

操作系统课程设计

<font size="2" color="#3D5063">&nbsp;&nbsp;&nbsp; write:write_test,</font></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:宋体">
<font size="2" color="#3D5063">&nbsp;&nbsp;&nbsp; open: open_test,</font></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:宋体">
<font size="2" color="#3D5063">&nbsp;&nbsp;&nbsp; release:release_test</font></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:宋体">
<font size="2" color="#3D5063">};</font></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:宋体">
<font size="2" color="#3D5063">/*</font></span><span style="font-family:宋体"><font size="2" color="#3D5063">安装模块<span lang="EN-US">,</span>注册设备</font><span lang="EN-US"><font size="2" color="#3D5063">*/</font></span></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:宋体">
<font size="2" color="#3D5063">int init_module(void){</font></span></p>
<p class="MsoNormal" style="text-indent: 21.0pt">
<span lang="EN-US" style="font-family:宋体"><font size="2" color="#3D5063">int 
result;</font></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:宋体">
<font size="2" color="#3D5063">&nbsp;&nbsp;&nbsp; result = register_chrdev(0, &quot;test&quot;, &amp;test_fops);</font></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:宋体">
<font size="2" color="#3D5063">&nbsp;&nbsp;&nbsp; if (result &lt; 0) {</font></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:宋体">
<font size="2" color="#3D5063">&nbsp;&nbsp;&nbsp; printk(KERN_INFO &quot;test: can't get major 
number\n&quot;);</font></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:宋体">
<font size="2" color="#3D5063">&nbsp;&nbsp;&nbsp; return result;</font></span></p>
<p class="MsoNormal" style="text-indent: 21.0pt">
<span lang="EN-US" style="font-family:宋体"><font size="2" color="#3D5063">}</font></span></p>
<p class="MsoNormal" style="text-indent: 21.0pt">
<span lang="EN-US" style="font-family:宋体"><font size="2" color="#3D5063">if (test_major 
== 0) test_major = result; </font></span></p>
<p class="MsoNormal" style="text-indent: 21.0pt">
<span lang="EN-US" style="font-family:宋体"><font size="2" color="#3D5063">return 
0;</font></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:宋体">
<font size="2" color="#3D5063">}</font></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:宋体">
<font size="2" color="#3D5063">&nbsp;</font></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:宋体">
<font size="2" color="#3D5063">/*</font></span><span style="font-family:宋体"><font size="2" color="#3D5063">卸载模块<span lang="EN-US">,</span>注销设备</font><span lang="EN-US"><font size="2" color="#3D5063">*/</font></span></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:宋体">
<font size="2" color="#3D5063">void cleanup_module(void){</font></span></p>
<p class="MsoNormal" style="text-indent: 31.5pt">
<span lang="EN-US" style="font-family:宋体"><font size="2" color="#3D5063">
unregister_chrdev(test_major, &quot;test&quot;);</font></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:宋体">
<font size="2" color="#3D5063">}</font></span></p>
<p class="MsoNormal">　</p>
<p class="MsoNormal">　</p>
<p class="MsoNormal">　</p>
<p class="MsoNormal"><span style="font-family:宋体">
<font size="2" color="#3D5063">为了测试虚拟字符设备能否正常工作，编写了以下的测试程序<span lang="EN-US">testdriver.c</span>：</font></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:宋体">
<font size="2" color="#3D5063">#include &lt;stdio.h&gt;</font></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:宋体">
<font size="2" color="#3D5063">#include &lt;sys/types.h&gt;</font></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:宋体">
<font size="2" color="#3D5063">#include &lt;sys/stat.h&gt;</font></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:宋体">
<font size="2" color="#3D5063">#include &lt;fcntl.h&gt;</font></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:宋体">
<font size="2" color="#3D5063">&nbsp;</font></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:宋体">
<font size="2" color="#3D5063">int main(void){</font></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:宋体">
<font size="2" color="#3D5063">&nbsp;</font></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:宋体">
<font size="2" color="#3D5063">&nbsp;&nbsp;&nbsp; int testdev;</font></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:宋体">
<font size="2" color="#3D5063">&nbsp;&nbsp;&nbsp; int i,j,k;</font></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:宋体">
<font size="2" color="#3D5063">&nbsp;</font></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:宋体">
<font size="2" color="#3D5063">&nbsp;&nbsp;&nbsp; char buf[10];</font></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:宋体">
<font size="2" color="#3D5063">&nbsp;&nbsp;&nbsp; char buf1[10];</font></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:宋体">
<font size="2" color="#3D5063">&nbsp;&nbsp; </font></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:宋体">
<font size="2" color="#3D5063">&nbsp;&nbsp;&nbsp; testdev = open(&quot;/dev/test&quot;,O_RDWR); 
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;/*</font></span><span style="font-family:
宋体"><font size="2" color="#3D5063">打开字符设备</font><span lang="EN-US"><font size="2" color="#3D5063">*/</font></span></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:宋体">
<font size="2" color="#3D5063">&nbsp;&nbsp;&nbsp; if ( testdev == -1 ){</font></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:宋体">
<font size="2" color="#3D5063">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; printf(&quot;Cann't open file \n&quot;);</font></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:宋体">
<font size="2" color="#3D5063">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; exit(0);</font></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:宋体">
<font size="2" color="#3D5063">&nbsp;&nbsp;&nbsp; }</font></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:宋体">
<font size="2" color="#3D5063">&nbsp;&nbsp;&nbsp; </font></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:宋体">
<font size="2" color="#3D5063">&nbsp;&nbsp;&nbsp; printf(&quot;Input the info:&quot;);</font></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:宋体">
<font size="2" color="#3D5063">&nbsp;&nbsp;&nbsp; scanf(&quot;%s&quot;,buf);</font></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:宋体">
<font size="2" color="#3D5063">&nbsp;&nbsp;&nbsp; </font></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:宋体">
<font size="2" color="#3D5063">&nbsp;&nbsp;&nbsp; j=write(testdev,buf,10); 
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;/*</font></span><span style="font-family:宋体"><font size="2" color="#3D5063">向字符设备写入信息</font><span lang="EN-US"><font size="2" color="#3D5063">*/</font></span></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:宋体">
<font size="2" color="#3D5063">&nbsp;&nbsp; </font></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:宋体">
<font size="2" color="#3D5063">&nbsp;&nbsp;&nbsp; k=read(testdev,buf1,10); 
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;/*</font></span><span style="font-family:宋体"><font size="2" color="#3D5063">从字符设备读已写的信息</font><span lang="EN-US"><font size="2" color="#3D5063">*/</font></span></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:宋体">
<font size="2" color="#3D5063">&nbsp;</font></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:宋体">
<font size="2" color="#3D5063">&nbsp;&nbsp;&nbsp; for (i = 0; i &lt; 10;i++)</font></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:宋体">
<font size="2" color="#3D5063">&nbsp;&nbsp;&nbsp; printf(&quot;%c&quot;,buf1[i]);</font></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:宋体">
<font size="2" color="#3D5063">&nbsp;&nbsp;&nbsp; printf(&quot;\n%d\n%d\n&quot;,j,k);</font></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:宋体">
<font size="2" color="#3D5063">&nbsp;</font></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:宋体">
<font size="2" color="#3D5063">&nbsp;&nbsp;&nbsp; close(testdev);</font></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:宋体">
<font size="2" color="#3D5063">&nbsp; </font></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:宋体">
<font size="2" color="#3D5063">&nbsp;&nbsp;&nbsp; return 0;</font></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:宋体">
<font size="2" color="#3D5063">} </font></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:宋体">
<font size="2" color="#3D5063">&nbsp;</font></span></p>
<p class="MsoNormal"><span style="font-family:宋体">
<font size="2" color="#3D5063">调试分析：</font></span></p>
<p class="MsoNormal" style="text-indent: 21.0pt"><span style="font-family:宋体">
<font size="2" color="#3D5063">先使用命令<span lang="EN-US">gcc –c test.c –Wall –DMODULE 
–D__KERNEL__ -DLINUX –I /usr/src/linux-2.4.20-8/include</span>来进行驱动程序的编译产生<span lang="EN-US">test.o</span>文件；然后用命令<span lang="EN-US">insmod 
–f test.o</span>安装设备驱动；按照成功后（用命令<span lang="EN-US">cat /proc/devices</span>看）用命令</font><span lang="EN-US"><font size="2" color="#3D5063">mknod&nbsp;&nbsp; </font></span></span>
<span lang="EN-US" style="font-family:宋体">
<font size="2" color="#3D5063">/dev/test c 254 0 </font></span>
<span style="font-family:宋体"><font size="2" color="#3D5063">创建字符设备<span lang="EN-US">(</span>应在<span lang="EN-US">/dev/</span>生成<span lang="EN-US">test)</span>。</font></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:宋体">
<font size="2" color="#3D5063">&nbsp;&nbsp;&nbsp; </font></span><span style="font-family:宋体">
<font size="2" color="#3D5063">成功创建字符设备后，使用命令<span lang="EN-US">gcc –o 
testdriver testdriver.c</span>编译测试程序并执行之，证明所编写的设备驱动满足了要求。</font></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:宋体">
<font size="2" color="#3D5063">&nbsp;</font></span></p>
<font size="2" color="#3D5063">&nbsp;&nbsp; </font></TD></TR>
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