ipage2.htm

操作系统课程设计

<span lang="EN-US" style="font-size: 10.0pt; font-family: 宋体">#include &lt;sys/wait.h&gt;</span></font></p>
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<span lang="EN-US" style="font-size: 10.0pt; font-family: 宋体">&nbsp;</span></font></p>
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<span lang="EN-US" style="font-size: 10.0pt; font-family: 宋体">void main(int argc 
,char argv[]){</span></font></p>
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<span lang="EN-US" style="font-size: 10.0pt; font-family: 宋体">&nbsp;&nbsp;&nbsp; &nbsp;pid_t 
p1,p2,p3;</span></font></p>
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<span lang="EN-US" style="font-size: 10.0pt; font-family: 宋体">&nbsp;&nbsp;&nbsp;&nbsp; pid_t 
t1,t2,t3;</span></font></p>
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<span lang="EN-US" style="font-size: 10.0pt; font-family: 宋体">&nbsp;&nbsp;&nbsp;&nbsp; int status;</span></font></p>
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<span lang="EN-US" style="font-size: 10.0pt; font-family: 宋体">&nbsp;&nbsp;&nbsp; </span></font>
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<font color="#3D5063"><span style="font-size: 10.0pt; font-family: 宋体">　　　<span lang="EN-US">if 
((p1=fork()) == 0){</span>　　　　　　　　　　　　　　　　　<span lang="EN-US">/*</span>创建第一个子进程<span lang="EN-US">*/</span></span></font></p>
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<span lang="EN-US" style="font-size: 10.0pt; font-family: 宋体">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span>
<span style="font-size: 10.0pt; font-family: 宋体">　<span lang="EN-US">execv(&quot;./clock&quot;,argv);</span></span></font></p>
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<span lang="EN-US" style="font-size: 10.0pt; font-family: 宋体">&nbsp;&nbsp;&nbsp; </span>
<span style="font-size: 10.0pt; font-family: 宋体">　<span lang="EN-US">}</span></span></font></p>
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<span lang="EN-US" style="font-size: 10.0pt; font-family: 宋体">&nbsp;&nbsp;&nbsp; </span>
<span style="font-size: 10.0pt; font-family: 宋体">　<span lang="EN-US">else if 
((p2=fork()) == 0) {</span>　　　　　　　　　　　　　　<span lang="EN-US">/*</span>创建第二个子进程<span lang="EN-US">*/</span></span></font></p>
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<span lang="EN-US" style="font-size: 10.0pt; font-family: 宋体">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span>
<span style="font-size: 10.0pt; font-family: 宋体">　<span lang="EN-US">execv(&quot;./pro&quot;,argv);</span></span></font></p>
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<span lang="EN-US" style="font-size: 10.0pt; font-family: 宋体">&nbsp;&nbsp;&nbsp; </span>
<span style="font-size: 10.0pt; font-family: 宋体">　<span lang="EN-US">}</span></span></font></p>
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<span lang="EN-US" style="font-size: 10.0pt; font-family: 宋体">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; else 
if((p3=fork()) == 0){</span><span style="font-size: 10.0pt; font-family: 宋体">　　　　　　　　　　　　　　　<span lang="EN-US">/*</span>创建第三个子进程<span lang="EN-US">*/</span></span></font></p>
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<span lang="EN-US" style="font-size: 10.0pt; font-family: 宋体">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; execv(&quot;./helloworld&quot;,argv);</span></font></p>
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<span lang="EN-US" style="font-size: 10.0pt; font-family: 宋体">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; }</span></font></p>
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<font color="#3D5063"><span style="font-size: 10.0pt; font-family: 宋体">　　　<span lang="EN-US">else{</span></span></font></p>
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<span lang="EN-US" style="font-size: 10.0pt; font-family: 宋体">&nbsp;&nbsp;&nbsp; </span>
<span style="font-size: 10.0pt; font-family: 宋体">　　　<span lang="EN-US">t1=waitpid(p1,&amp;status,0);</span></span></font></p>
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<span lang="EN-US" style="font-size: 10.0pt; font-family: 宋体">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span>
<span style="font-size: 10.0pt; font-family: 宋体">　<span lang="EN-US">t2=waitpid(p2,&amp;status,0);</span></span></font></p>
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<span lang="EN-US" style="font-size: 10.0pt; font-family: 宋体">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
&nbsp;&nbsp;&nbsp;t3=waitpid(p3,&amp;status,0);</span></font></p>
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<span lang="EN-US" style="font-size: 10.0pt; font-family: 宋体">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span>
<span style="font-size: 10.0pt; font-family: 宋体">}</span></font></p>
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<font color="#3D5063"><span style="font-size: 10.0pt; font-family: 宋体">}</span></font></p>
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<font color="#3D5063"><font size="2"><span style="font-family: 宋体">main.c由 命令gcc 
-o main main.c编译完成。</span></font><span lang="EN-US" style="font-size: 10.0pt; font-family: 宋体">&nbsp;</span></font></p>
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<span lang="EN-US" style="font-size: 10.0pt; font-family: 宋体">&nbsp;</span></font></p>
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<span lang="EN-US" style="font-size: 10.0pt; font-family: 宋体">&nbsp;</span></font></p>
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<span lang="EN-US" style="font-size: 10.0pt; font-family: 宋体">&nbsp;</span></font></p>
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<font color="#3D5063"><span style="font-size: 10.0pt; font-family: 宋体">下面是三个<span lang="EN-US">gtk</span>子程序的源代码。</span></font></p>
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<span lang="EN-US" style="font-size: 10.0pt; font-family: 宋体">clock.c</span><span style="font-family: 宋体"><font size="2">是一个在一个窗口中显示时间的子程序，其源代码如下</font></span><span lang="EN-US" style="font-size: 10.0pt; font-family: 宋体">:</span></font></p>
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<span lang="EN-US" style="font-size: 10.0pt; font-family: 宋体">#include&lt;gtk/gtk.h&gt;</span></font></p>
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<font color="#3D5063"><span style="font-size: 10.0pt; font-family: 宋体">　<span lang="EN-US">#include&lt;time.h&gt;</span></span></font></p>
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<span lang="EN-US" style="font-size: 10.0pt; font-family: 宋体">&nbsp;static GtkWidget* 
clocker;</span></font></p>
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<span lang="EN-US" style="font-size: 10.0pt; font-family: 宋体">&nbsp;</span></font></p>
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<span lang="EN-US" style="font-size: 10.0pt; font-family: 宋体">void clock_begin(){</span><span style="font-size: 10.0pt; font-family: 宋体">　　　　　　　　　　　　　　　　　　　　<span lang="EN-US">/*</span>实现计时的回调函数<span lang="EN-US">*/</span></span></font></p>
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<span lang="EN-US" style="font-size: 10.0pt; font-family: 宋体">&nbsp;&nbsp;&nbsp;&nbsp; ime_t now;</span></font></p>
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<span lang="EN-US" style="font-size: 10.0pt; font-family: 宋体">&nbsp;&nbsp;&nbsp;&nbsp; struct tm 
*l_time;</span></font></p>
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<span lang="EN-US" style="font-size: 10.0pt; font-family: 宋体">&nbsp;&nbsp;&nbsp;&nbsp; gchar 
buf[100];</span></font></p>
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<span lang="EN-US" style="font-size: 10.0pt; font-family: 宋体">&nbsp;&nbsp;&nbsp;&nbsp; now=time((time_t 
*)NULL);</span></font></p>
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<span lang="EN-US" style="font-size: 10.0pt; font-family: 宋体">&nbsp;&nbsp;&nbsp;&nbsp; l_time=localtime(&amp;now);</span></font></p>
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<span lang="EN-US" style="font-size: 10.0pt; font-family: 宋体">&nbsp;&nbsp;&nbsp; &nbsp;sprintf(buf,&quot;\n%d:%d:%d&quot;,l_time-&gt;tm_hour,l_time-&gt;tm_min,l_time-&gt;tm_sec);</span></font></p>
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<span lang="EN-US" style="font-size: 10.0pt; font-family: 宋体">&nbsp;&nbsp;&nbsp;&nbsp; 
gtk_label_set_text(GTK_LABEL(clocker),buf);</span></font></p>
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<span lang="EN-US" style="font-size: 10.0pt; font-family: 宋体">}</span></font></p>
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<span lang="EN-US" style="font-size: 10.0pt; font-family: 宋体">int main(int 
argc,char *argv[]){</span></font></p>
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<span lang="EN-US" style="font-size: 10.0pt; font-family: 宋体">&nbsp;&nbsp;&nbsp;&nbsp; GtkWidget* 
window;</span></font></p>
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<span lang="EN-US" style="font-size: 10.0pt; font-family: 宋体">&nbsp;&nbsp;&nbsp;&nbsp; GtkWidget* 
vbox;</span></font></p>
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<span lang="EN-US" style="font-size: 10.0pt; font-family: 宋体">&nbsp;&nbsp;&nbsp;&nbsp; GtkWidget* 
hbox;</span></font></p>
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<span lang="EN-US" style="font-size: 10.0pt; font-family: 宋体">&nbsp;&nbsp;&nbsp;&nbsp; GtkWidget* 
sep;</span></font></p>
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<span lang="EN-US" style="font-size: 10.0pt; font-family: 宋体">&nbsp;&nbsp;&nbsp;&nbsp; GtkWidget* 
label;</span></font></p>
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