Linux网络编程---本地套接字

1.概述

本地套接字
    1：作用:本地的进程间通信
    2.有关系的进程间通信
    3.没有关系的进程间的通信
本地套结字实现流程和网络套结字实现相似，一般采用tcp
 

 二.通信流程

本地套结字通信的流程:
    1.服务器端:
        1.1 int fd = socket(AF_UNIX/AF_LOCAL,SOCKET_STREAM,0)
        1.2 监听的套结字需要绑定本地的套结字文件
            struct sockaddr_un addr;
            绑定成功后指定的sun_path中的套结字文件会自动生成
            bind(fd,addr,len);
        1.3 监听
            listen(fd,100);
        
        1.4等待并接收连接请求
            struct sockaddr_un cliaddr;
            int cfd = accept(fd,&cliaddr,&len)
        1.5通信
            recv 
            send
        1.6关闭
        
    客户端
        1. int fd = socket(AF_LOCAL,SOCKET_STREAM,0)

        2. 绑定成功后指定的sun_path中的套结字文件会自动生成
            struct sockaddr_un addr;
            bind(fd,addr,len)

        3.连接
            struct sockaddr_un serveraddr;
            connect(fd,&serveraddr,len);

        4.通信

        5.关闭

三.实例代码实现

3.1 server

#include <stdio.h>
#include <string.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <stdlib.h>

#include <sys/un.h>


int main()
{

    unlink("server.sock");//解决报错:bind: Address already in use

    int sockfd =  socket(AF_LOCAL,SOCK_STREAM,0);
    if(sockfd == -1)
    {
        perror("socket");
        exit(-1);
    }

    struct sockaddr_un server;
    server.sun_family = AF_LOCAL;
    strcpy(server.sun_path,"server.sock");
    if(bind(sockfd,(const struct sockaddr*)&server,sizeof(server)) == -1)
    {
        perror("bind");
        exit(-1);
    }

    if(listen(sockfd, 100) == -1)
    {
        perror("listen");
        exit(-1);
    }
    struct sockaddr_un client;
    int len = sizeof(client);
    int client_fd = accept(sockfd,(struct sockaddr*)&client,&len);
    if(client_fd == -1)
    {
        perror("accept");
        exit(-1);
    }
    char recvbuff[1024] = {0};
    char *server_data = "i am server";
    while(1)
    {
        memset(recvbuff,0,sizeof(recvbuff));
        len = recv(client_fd,recvbuff,sizeof(recvbuff),0);
        if(len == -1)
        {
            perror("recv");
            break;
        }
        else if(len == 0)
        {
            printf("客户端断开连接\n");
        }
        else if(len > 0)
        {
            printf("recv client data : %s\n",recvbuff);
        }
        send(client_fd,server_data,strlen(server_data),0);
    }
    close(sockfd);
    close(client_fd);
    return 0;
}

3.2 client

#include <stdio.h>
#include <string.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <stdlib.h>
#include <sys/un.h>


int main()
{
    unlink("client.sock"); //解决报错:bind: Address already in use


    int sockfd =  socket(AF_LOCAL,SOCK_STREAM,0);
    if(sockfd == -1)
    {
        perror("socket");
        exit(-1);
    }

    struct sockaddr_un server;
    server.sun_family = AF_LOCAL;
    strcpy(server.sun_path,"client.sock");
    if(bind(sockfd,(const struct sockaddr*)&server,sizeof(server)) == -1)
    {
        perror("bind");
        exit(-1);
    }


    struct sockaddr_un client;
    client.sun_family = AF_LOCAL;
    memcpy(client.sun_path,"server.sock",sizeof("server.sock"));
    int len = sizeof(client);
    int ret = connect(sockfd,(const struct sockaddr*)&client,len);
    if(ret == -1)
    {
        perror("connect");
        exit(-1);
    }
    
    int num = 0;
    char buff[1024];
    while(1)
    {
        memset(buff,0,sizeof(buff));
        printf("client say: %s\n",buff);
        sprintf(buff,"hello i am clinet------%d\n",num++);
        len = send(sockfd,buff,strlen(buff)+1,0);
        if(len == -1)
        {
            perror("send");
            break;
        }
        sleep(1);
        memset(buff,0,sizeof(buff));
        len = recv(sockfd,buff,sizeof(buff),0);
        if(len == -1)
        {
            perror("recv");
            exit(-1);
        }
        else if(len == 0)
        {
            printf("服务端断开连接\n");
        }
        else if(len > 0)
        {
            printf("recv server data : %s\n",buff);
        }
    }
    close(sockfd);
    return 0;
}

原文地址：https://blog.csdn.net/zbz123456789_/article/details/144334299

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