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</a></li></ul></li></ul></div></div> <!----></nav>  <ul class="sidebar-links"><li><section class="sidebar-group depth-0"><p class="sidebar-heading open"><span>进程创建与进程间通信</span> <!----></p> <ul class="sidebar-links sidebar-group-items"><li><a href="/OS_lab_tutorial/Linux/Assignment/Lab2.html#本章导读" class="sidebar-link">本章导读</a><ul class="sidebar-sub-headers"></ul></li><li><a href="/OS_lab_tutorial/Linux/Assignment/Lab2.html#实验内容" class="sidebar-link">实验内容</a><ul class="sidebar-sub-headers"><li class="sidebar-sub-header"><a href="/OS_lab_tutorial/Linux/Assignment/Lab2.html#进程创建" class="sidebar-link">进程创建</a></li><li class="sidebar-sub-header"><a href="/OS_lab_tutorial/Linux/Assignment/Lab2.html#创建进程树" class="sidebar-link">创建进程树</a></li><li class="sidebar-sub-header"><a href="/OS_lab_tutorial/Linux/Assignment/Lab2.html#信号通信" class="sidebar-link">信号通信</a></li><li class="sidebar-sub-header"><a href="/OS_lab_tutorial/Linux/Assignment/Lab2.html#管道通信" class="sidebar-link">管道通信</a></li></ul></li></ul></section></li></ul> </aside> <main class="page"> <div class="theme-default-content content__default"><h1 id="进程创建与进程间通信"><a href="#进程创建与进程间通信" class="header-anchor">#</a> 进程创建与进程间通信</h1> <h2 id="本章导读"><a href="#本章导读" class="header-anchor">#</a> 本章导读</h2> <p>通过练习理解进程创建以及进程并发执行的过程，握fork系统调用的方法，了解进程间通信的常用方法。</p> <h2 id="实验内容"><a href="#实验内容" class="header-anchor">#</a> 实验内容</h2> <h3 id="进程创建"><a href="#进程创建" class="header-anchor">#</a> 进程创建</h3> <p>请问在下方的代码中，一共有多少个进程被创建？</p> <blockquote><p>可以通过fork返回的值来判断当前进程是子进程还是父进程。</p></blockquote> <div class="language-c extra-class"><pre class="language-c"><code><span class="token macro property"><span class="token directive-hash">#</span><span class="token directive keyword">include</span> <span class="token string">&lt;unistd.h&gt;</span></span>
<span class="token macro property"><span class="token directive-hash">#</span><span class="token directive keyword">include</span> <span class="token string">&lt;stdio.h&gt;</span></span>
 
<span class="token keyword">int</span> <span class="token function">main</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
<span class="token punctuation">{</span>
    <span class="token function">fork</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token function">fork</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">&amp;&amp;</span> <span class="token function">fork</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">||</span> <span class="token function">fork</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token function">fork</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token function">sleep</span><span class="token punctuation">(</span><span class="token number">100</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token keyword">return</span> <span class="token number">0</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
</code></pre></div><h3 id="创建进程树"><a href="#创建进程树" class="header-anchor">#</a> 创建进程树</h3> <p>编写程序创建进程树如图所示，在每个进程中显示当前进程标识getpid()和父进程标识getppid()。</p> <p><img src="/OS_lab_tutorial/docs/.vuepress/public/Linux/tree.png" alt="图片1" title="进程树"></p> <h3 id="信号通信"><a href="#信号通信" class="header-anchor">#</a> 信号通信</h3> <p>用fork()创建两个子进程，再用系统调用signal()让父进程捕捉键盘上来的中断信号（即DEL键）；当捕捉到中断信号后，父进程用系统调用kill()向两个子进程发出信号，子进程捕捉到信号后分别输出下列信息后终止：</p> <p>Child process1 is killed by parent!</p> <p>Child process2 is killed by parent!</p> <p>父进程等待两个子进程终止后，输出如下的信息后终止：</p> <p>Parent process is killed!</p> <h3 id="管道通信"><a href="#管道通信" class="header-anchor">#</a> 管道通信</h3> <p>实现进程的管道通信，用系统调用pipe()建立一管道，二个子进程P1和P2分别向管道各写一句话：</p> <p>Child 1 is sending a message!</p> <p>Child 2 is sending a message!</p> <p>父进程从管道中读出二个来自子进程的信息并显示。</p></div> <footer class="page-edit"><!----> <!----></footer> <!----> </main></div><div class="global-ui"></div></div>
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