用C子进程之间的管道 [英] Pipes between child processes in C

问题描述

我以前见过这个问题，但还是有点困惑：我如何创建同一母公司的子进程之间的通信？所有我想此刻要做的就是从第一子进程传递消息到第n子进程。我的想法是在父进程创建n-1个管道，然后家长的两端重定向到下一个子进程。我想不通的是，我们将如何重定向从父两端如果下一个子进程还没有被创造出来的？我觉得有一个在我处理这个方法的问题。

I've seen this question before, but still a bit confused: how would I create communication between child processes of the same parent? All I'm trying to do at the moment is passing a message from the first child process to the nth child process. My idea is to create n-1 pipes in the parent process and then redirect the parent's ends to the next child process. What I can't figure out is, how would we redirect the ends from the parent if the next child process hasn't been created? I feel there's an issue in the way I'm approaching this.

编辑：我的目标是打印从第一子进程传递给最后一个消息。这是一个简单的程序。

My goal is to print the message that was passed from the first child process to the last one. It's a simple program.

推荐答案

您不必先创建过程。该解决方案如下：首先创建所有需要的管道，将它们保存在一些阵列。然后，你做了叉，重定向输入和输出流（子进程）因此，关闭未使用的管端并执行 EXEC 。没有相应的流程可以存在管道，他们有缓冲区，所以你可以写一个管道，而没有人还在读书，马上就好。

You don't need to create the processes first. The solution is as follows: you first create all the needed pipes, save them in some array. Then you do a fork, redirect input and output streams (for the child process) accordingly, close unused pipe ends and perform an exec. Pipes can exist without the corresponding processes, they have buffers, so you can write to a pipe while nobody's still reading, it will be ok.

您只应 EXEC 做之前要注意关闭未使用的ID的。并注意写入一个烟斗的输入端点（所有输入端点）可能成为封闭的：它可能会导致 SIGPIPE

You should just be aware of closing unused id's before doing exec. And be careful writing to a pipe which input endpoints (all the input endpoints) could become closed: it could result in a SIGPIPE.

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