Unnamed pipes for communication between processes under linux

#include <stdio.h>
#include"common.h"


/*
 * 无名管道通信:
 * 1.不支持多人写入,写入不保护
 * 2.用于1对1通信
 * 3.fd[0]为读端  fd[1]为写端
 * 4.阻塞等待
 *
*/
int main()
{
    
    
    //1.创建无名管道
    int fd[2];
    pipe(fd);
    //2.创建子进程
    pid_t pid = fork();
    if(pid<0)//进程创建失败
        {
    
    
        printf("fork failed\n");
        exit(1);
    }
    else if(pid>0)//父进程
        {
    
    
        close(fd[1]);       //关闭父进程的写入权限,防止子进程结束后自己当读写者导致阻塞等待
        char buf[20];           //准备好buf
        bzero(buf,sizeof(buf));     //清空buf

        read(fd[0],buf,sizeof(buf));  //读取管道中的数据放入buf中
        printf("收到子进程的消息:%s\n",buf);

    }
    else//子进程
        {
    
    
        write(fd[1],"hello",10);        //写数据进管道中

    }
   return 0;
}

This picture is the read and write characteristics of the pipeline
Insert picture description here

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Origin blog.csdn.net/weixin_50188452/article/details/110285509