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<li class="toctree-l2"><a class="reference internal" href="../chapter3/2task-switching.html">任务切换</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../chapter4/3sv39-implementation-1.html">实现 SV39 多级页表机制（上）</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../chapter4/4sv39-implementation-2.html">实现 SV39 多级页表机制（下）</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../chapter4/7exercise.html">chapter4练习</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../chapter5/1process.html">与进程有关的重要系统调用</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../chapter5/2core-data-structures.html">进程管理的核心数据结构</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../chapter5/3implement-process-mechanism.html">进程管理机制的设计实现</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../chapter5/4exercise.html">chapter5练习</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../chapter6/1fs-interface.html">文件系统接口</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../chapter6/2fs-implementation-1.html">简易文件系统 easy-fs (上)</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../chapter6/2fs-implementation-2.html">简易文件系统 easy-fs (下)</a></li>
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<div class="section" id="id1">
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<h1>引言<a class="headerlink" href="#id1" title="永久链接至标题">¶</a></h1>
|
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<div class="section" id="id2">
|
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<h2>本章导读<a class="headerlink" href="#id2" title="永久链接至标题">¶</a></h2>
|
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<p>本章将基于文件描述符实现父子进程之间的通信机制——管道。
|
||
我们还将扩展 <code class="docutils literal notranslate"><span class="pre">exec</span></code> 系统调用，使之能传递运行参数，并进一步改进 shell 程序，使其支持重定向符号 <code class="docutils literal notranslate"><span class="pre">></span></code> 和 <code class="docutils literal notranslate"><span class="pre"><</span></code> 。</p>
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</div>
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<div class="section" id="id3">
|
||
<h2>实践体验<a class="headerlink" href="#id3" title="永久链接至标题">¶</a></h2>
|
||
<p>获取本章代码：</p>
|
||
<p>在 qemu 模拟器上运行本章代码参考框架：</p>
|
||
<div class="highlight-console notranslate"><div class="highlight"><pre><span></span><span class="gp">$ </span>git clone <span class="sb">``</span>gitaddr of github-classroom-build-lab4<span class="sb">``</span>
|
||
<span class="gp">$ </span><span class="nb">cd</span> <span class="sb">``</span>github-classroom-build-lab4<span class="sb">``</span>
|
||
<span class="gp">$ </span>make setupclassroom_test6 //注意：这一步很重要，是用于github classroom自动评测你的工作。这一步只需在首次克隆项目仓库时执行一次，以后一般就不用执行了，除非 .github/workflows/classroom.yml发生了变化。
|
||
<span class="gp">$ </span><span class="nb">cd</span> os7-ref
|
||
<span class="gp">$ </span>make run
|
||
</pre></div>
|
||
</div>
|
||
<div class="admonition note">
|
||
<p class="admonition-title">注解</p>
|
||
<p>实验名称 ：实验编号</p>
|
||
<ul class="simple">
|
||
<li><p>lab0-0 : test1</p></li>
|
||
<li><p>lab0-1：test2</p></li>
|
||
<li><p>lab1：test3</p></li>
|
||
<li><p>lab2：test4</p></li>
|
||
<li><p>lab3：test5</p></li>
|
||
<li><p>lab4：test6</p></li>
|
||
<li><p>lab5：test8</p></li>
|
||
</ul>
|
||
</div>
|
||
<p>在 qemu 模拟器上运行 <a class="reference external" href="https://github.com/LearningOS/rust-based-os-comp2022/tree/main/os7-ref">os7参考框架:</a> ：</p>
|
||
<div class="highlight-console notranslate"><div class="highlight"><pre><span></span><span class="gp">$ </span><span class="nb">cd</span> os7-ref
|
||
<span class="gp">$ </span>make run
|
||
</pre></div>
|
||
</div>
|
||
<p>进入shell程序后，可以运行管道机制的简单测例 <code class="docutils literal notranslate"><span class="pre">ch7b_pipetest</span></code>， <code class="docutils literal notranslate"><span class="pre">ch7b_pipetest</span></code> 需要保证父进程通过管道传输给子进程的字符串不会发生变化。</p>
|
||
<p>测例输出大致如下：</p>
|
||
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span>>> ch7b_pipetest
|
||
Read OK, child process exited!
|
||
pipetest passed!
|
||
Shell: Process 2 exited with code 0
|
||
>>
|
||
</pre></div>
|
||
</div>
|
||
<p>同样的，也可以运行较为复杂的测例 <code class="docutils literal notranslate"><span class="pre">ch7b_pipe_large_test</span></code>，体验通过两个管道实现双向通信。</p>
|
||
<p>此外，在本章我们为shell程序支持了输入/输出重定向功能，可以将一个应用的输出保存到一个指定的文件。例如，下面的命令可以将 <code class="docutils literal notranslate"><span class="pre">ch7b_yield</span></code> 应用的输出保存在文件 <code class="docutils literal notranslate"><span class="pre">fileb</span></code> 当中，并在应用执行完毕之后确认它的输出：</p>
|
||
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="o">>></span> <span class="n">ch7b_yield</span> <span class="o">></span> <span class="n">fileb</span>
|
||
<span class="n">Shell</span><span class="p">:</span> <span class="n">Process</span> <span class="mi">2</span> <span class="n">exited</span> <span class="k">with</span> <span class="n">code</span> <span class="mi">0</span>
|
||
<span class="o">>></span> <span class="n">ch7b_cat</span> <span class="n">fileb</span>
|
||
<span class="n">Hello</span><span class="p">,</span> <span class="n">I</span> <span class="n">am</span> <span class="n">process</span> <span class="mf">2.</span>
|
||
<span class="n">Back</span> <span class="ow">in</span> <span class="n">process</span> <span class="mi">2</span><span class="p">,</span> <span class="n">iteration</span> <span class="mf">0.</span>
|
||
<span class="n">Back</span> <span class="ow">in</span> <span class="n">process</span> <span class="mi">2</span><span class="p">,</span> <span class="n">iteration</span> <span class="mf">1.</span>
|
||
<span class="n">Back</span> <span class="ow">in</span> <span class="n">process</span> <span class="mi">2</span><span class="p">,</span> <span class="n">iteration</span> <span class="mf">2.</span>
|
||
<span class="n">Back</span> <span class="ow">in</span> <span class="n">process</span> <span class="mi">2</span><span class="p">,</span> <span class="n">iteration</span> <span class="mf">3.</span>
|
||
<span class="n">Back</span> <span class="ow">in</span> <span class="n">process</span> <span class="mi">2</span><span class="p">,</span> <span class="n">iteration</span> <span class="mf">4.</span>
|
||
<span class="k">yield</span> <span class="k">pass</span><span class="o">.</span>
|
||
|
||
<span class="n">Shell</span><span class="p">:</span> <span class="n">Process</span> <span class="mi">2</span> <span class="n">exited</span> <span class="k">with</span> <span class="n">code</span> <span class="mi">0</span>
|
||
<span class="o">>></span>
|
||
</pre></div>
|
||
</div>
|
||
</div>
|
||
<div class="section" id="id5">
|
||
<h2><a class="reference external" href="https://github.com/LearningOS/rust-based-os-comp2022/tree/main/os7-ref">os7参考框架:</a><a class="headerlink" href="#id5" title="永久链接至标题">¶</a></h2>
|
||
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span> ── os7-ref
|
||
└── src
|
||
├── ...
|
||
├── fs
|
||
│ ├── inode.rs
|
||
│ ├── mod.rs
|
||
│ ├── pipe.rs(新增：实现了 File Trait 的第三个实现——可用来进程间通信的管道)
|
||
│ └── stdio.rs
|
||
├── mm
|
||
│ ├── address.rs
|
||
│ ├── frame_allocator.rs
|
||
│ ├── heap_allocator.rs
|
||
│ ├── memory_set.rs
|
||
│ ├── mod.rs
|
||
│ └── page_table.rs
|
||
├── syscall
|
||
│ ├── fs.rs(修改：添加了sys_pipe和sys_dup)
|
||
│ ├── mod.rs
|
||
│ └── process.rs(修改：sys_exec添加了对参数的支持)
|
||
├── task
|
||
├── context.rs
|
||
├── manager.rs
|
||
├── mod.rs
|
||
├── pid.rs
|
||
├── processor.rs
|
||
├── switch.rs
|
||
├── switch.S
|
||
└── task.rs(修改：在exec中将参数压入用户栈中)
|
||
|
||
cloc easy-fs os
|
||
-------------------------------------------------------------------------------
|
||
Language files blank comment code
|
||
-------------------------------------------------------------------------------
|
||
Rust 42 317 434 3574
|
||
Assembly 4 53 26 526
|
||
make 1 13 4 48
|
||
TOML 2 4 2 23
|
||
-------------------------------------------------------------------------------
|
||
SUM: 49 387 466 4171
|
||
-------------------------------------------------------------------------------
|
||
</pre></div>
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