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fix bug in lec10:p1
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lec10/p1-ipcoverview.md

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@@ -175,8 +175,8 @@ Remote Procedure Call, RPC = send + recv
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#### 管道(pipe)的应用场景
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- 通常管道两端的进程会各自关闭管道的一个文件描述符,如
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- 父进程关闭读描述符,只能向管道**写数据**
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- 子进程关闭写描述符,只能从管道**读数据**
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- 父进程关闭写描述符,只能向管道**读数据**
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- 子进程关闭读描述符,只能从管道**写数据**
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![bg right:54% 95%](figs/pipe-fds-close.png)
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