本地套接字

TCP\UDP实现不同主机、网络通信
本地套接字实现本地的进程间的通信，类似的，一般采用TCP的通信流程

生成套接字文件

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

int main(){

    unlink("client.sock");
    //1.创建套接字
    int cfd=socket(AF_LOCAL,SOCK_STREAM,0);
    if(cfd==-1){
        perror("socket");
        exit(-1);
    }

    //2.绑定本地套接字文件
    struct sockaddr_un addr;
    addr.sun_family=AF_LOCAL;
    strcpy(addr.sun_path,"client.sock");
    int ret=bind(cfd,(struct sockaddr *)&addr,sizeof(addr));
    if(ret==-1){
        perror("bind");
        exit(-1);
    }



    //3.连接服务器
    struct sockaddr_un seraddr;
    seraddr.sun_family=AF_LOCAL;
    strcpy(seraddr.sun_path,"server.sock");

    ret=connect(cfd,(struct sockaddr *)&seraddr,sizeof(addr));
    if(ret==-1){
        perror("connect");
        exit(-1);
    }
    //4.通信
    int num=0;
    while(1){

        char buf[128];
        sprintf(buf,"hello,i am client:%d\n",num++);
        send(cfd,buf,strlen(buf)+1,0);
        printf("clientsay:%s\n",buf);

        //接收数据
        int len=recv(cfd,buf,sizeof(buf),0);
        if(len==-1){
            perror("recv");
            exit(-1);
        }else if(len==0){
            printf("server closed...\n");
            break;
        }else if(len>0){
            printf("server say:%s\n",buf);
        }
        sleep(1);
        
    }
    close(cfd);


    return 0;
}

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

int main(){

    unlink("server.sock");
    //1.创建套接字
    int lfd=socket(AF_LOCAL,SOCK_STREAM,0);
    if(lfd==-1){
        perror("socket");
        exit(-1);
    }

    //2.绑定本地套接字文件
    struct sockaddr_un addr;
    addr.sun_family=AF_LOCAL;
    strcpy(addr.sun_path,"server.sock");
    int ret=bind(lfd,(struct sockaddr *)&addr,sizeof(addr));
    if(ret==-1){
        perror("bind");
        exit(-1);
    }

    //3.监听
    ret=listen(lfd,100);
    if(ret==-1){
        perror("listen");
        exit(-1);
    }

    //4.等待客户端连接
    struct sockaddr_un cliaddr;
    int len=sizeof(cliaddr);
    int cfd=accept(lfd,(struct sockaddr *)&cliaddr,&len);
    if(cfd==-1){
        perror("accepr");
        exit(-1);
    }

    printf("client socket filename:%s\n",cliaddr.sun_path);


    //5.通信
    while(1){

        char buf[128];
        int len=recv(cfd,buf,sizeof(buf),0);
        if(len==-1){
            perror("recv");
            exit(-1);
        }else if(len==0){
            printf("client closed...\n");
            break;
        }else if(len>0){
            printf("client say:%s\n",buf);
            send(cfd,buf,len,0);
        }
        
    }
    close(cfd);
    close(lfd);

    return 0;
}