15-5 匿名管道进程间通信的原理

https://blog.csdn.net/gjy_it/article/details/104511556

15-6 实战通过socketpair进行进程间通信

socketpair.c

#include<stdio.h>
#include<string.h>
#include<unistd.h>
#include<sys/socket.h>
int main()   
{
    int sv[2];    //一对无名的套接字描述符
    if(socketpair(PF_LOCAL,SOCK_STREAM,0,sv) < 0)   //成功返回零 失败返回-1
    {
        perror("socketpair");
        return 0;
    }
    pid_t id = fork();        //fork出子进程
    if(id == 0)               //子进程
    {
    const char* msg = "I'm children!\n";
    char buf[1024];
    close(sv[1]);
    while(1)
    {
        write(sv[0],msg,strlen(msg));
        sleep(1);
        ssize_t _s = read(sv[0],buf,sizeof(buf)-1);
        if(_s > 0)
        {
        buf[_s] = '\0';
        printf("parent say to children : %s\n",buf);
        }
    }
    } else { // parent父进程
    const char* msg = "I'm father!\n";
    char buf[1024];
    close(sv[0]);//关闭写端口
    while(1)
    {
        ssize_t _s = read(sv[1],buf,sizeof(buf)-1);
        if(_s > 0)
        {
        buf[_s] = '\0';
        printf("Children say to parent : %s\n",buf);
        usleep(1);
        }
        write(sv[1],msg,strlen(msg));
    }
    }
    return 0;
}

可以看到来回打印子进程和父进程的内容。