在Linux中使用管道进行进程间通信

问题描述

我已经编写了用于在Linux中将数字写入管道的代码.如下所示，但是显示错误，有人可以帮我吗?

I have written my code for writing a number to pipe in linux. it is as under,but it is showing errors,can anyone help me on this.

基本上该程序的问题陈述如下:-一个程序将打开管道，并在管道中写入一个数字. -其他程序将打开相同的管道，将读取该数字并进行打印. -关闭两个管道

Basically the problem statement for the program is as below:-One program will open a pipe, write a number to pipe. - Other program will open the same pipe, will read the number and print them. - Close both the pipes

int main()
{

int number;




FILE *fout;

fout = popen("  ","w");



pclose(fout);

return 0;

}

现在我的问题是我应该在popen命令选项中给出什么命令(如上面的空白所示)，以便我可以继续进行并向管道写一个数字.

Now my question is what command should i give in the popen command option (as shown blank above) so as i can proceed further and write a number to pipe.

推荐答案

您不太了解IPC和管道的工作方式.请阅读一本好书:高级Linux编程关于这些问题的几章内容.

You don't understand well how IPC and pipes work; please read a good book: Advanced Linux Programming has several chapters on these issues.

库函数 popen(3)运行命令.很可能您的系统上没有p命令.我猜fp为NULL并且errno被设置.

The library function popen(3) runs a command. Very probably, you don't have a p command on your system. I guess fp is NULL and errno is set.

popen使用的是 pipe(2)， 叉(2)， dup2(2)， execve(2)和/bin/sh -c等

popen is using pipe(2), fork(2), dup2(2), execve(2) and /bin/sh -c etc

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