检查 stdin 中的特定字符串
我有一个小问题，我不知道如何解决。
我有一个程序，基本上是由标准输入中的输入命令的。它只是继续运行，直到收到特定的字符串，然后执行其他操作。好的，我无权访问控制这些输入的代码，但我想添加一个新命令。
我的想法如下：
。在我的程序中创建一个管道
。分叉该进程
。其中一个继续执行原始程序，而另一个则从标准输入读取。
。将继续通常执行的进程的标准输入重定向到管道。
。持续监听标准输入的部分，检查接收到的内容，如果不是新命令，则重定向管道（以便旧命令仍然有效）
。如果是新命令，则发送特定信号。
我一直在考虑在c++中使用pipe/fork/dup2来实现它，但我不知道如何在继续执行的过程中发送和捕获信号。我怎样才能在 C++ 中做到这一点？你们有什么建议吗？这可能有效吗？
I have a small problem that I don't know how to solve.
I have a program which is basically commanded by inputs in stdin. It just keeps running until receives a particular string and then do something else. Ok, I don't have access to the code that controls these inputs but I would like to add a new command.
The idea I have is the following:
. Create a pipe in my program
. Fork the process
. One of them goes on with the the original program while the other reads from stdin.
. Redirect stdin of process that continued the usual execution to the pipe.
. The part that keeps listening from stdin, checks what is receives, if it is not the new command, just redirect the pipe (so that the old commands still work)
. If it is the new command, send a particular signal.
I've been thinking about implementing that with pipe/fork/dup2 in c++, but I don't know how I would send and catch a signal in the process that continued the execution. How can I do that in c++? Do you guys have any suggestion? Does this might work?
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您的程序应该执行以下操作：
stdin读取数据。并且应该像这样执行：
$ cat input.txt |我的程序 | other_prog所有未由您的程序处理的输入都将转到现有程序，因为它是从 input.txt 获取的（当然，数据源可以是任意的，不一定是文件）。
Your program should just do following:
stdin.stdout(or all data except extracted command data, depending on your needs)And it shoulde be executed like this:
$ cat input.txt | my_prog | other_progAll input which is not handled by your program, will go to existing program, as it is got from input.txt (of course, data source could be arbitrary, not necessarily file).