linux 本地套接字通信(localSocket)两种方式

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本地套接字通信有两种方式：一种是tcp流程，一种是udp流程。

TCP localSocket流程：

• server端

/*tcp的本地套接字服务器流程：    创建套接字  socket(AF_UNIX,SOCK_STREAM,0)    绑定 struct sockaddr_un &强转    侦听 listen     获得新连接 accept     循环通信 read-write     关闭文件描述符 close*///本地socket通讯服务端#include #include #include #include #include #include #include #include int main()    //创建socket    int lfd = socket(AF_UNIX,SOCK_STREAM,0);//SOCK_STREAM:tcp流程    if(lfd<0)        perror("socket error");        return -1;        //删除socket文件，避免bind失败 (如果套接字存在，删除套接字)    unlink("./server.sock");    //绑定    struct sockaddr_un serv;    bzero(&serv,sizeof(serv));    serv.sun_family = AF_UNIX;    strcpy(serv.sun_path,"./server.sock");    int ret = bind(lfd,(struct sockaddr *)&serv,sizeof(serv));    if(ret<0)        perror("bind error");        return -1;        //监听    listen(lfd,10);    //接收新的链接-accept    struct sockaddr_un client;    bzero(&client,sizeof(client));    socklen_t len = sizeof(client);    int cfd = accept(lfd,(struct sockaddr*)&client,&len);    if(cfd<0)        perror("accept error");        return -1;        printf("cient->[%s]\n",client.sun_path);    int n;    char buf[1024];    while(1)        //读取数据        memset(buf,0x00,sizeof(buf));        n = read(cfd,buf,sizeof(buf));        if(n<=0)            printf("read error or client close ,n=[%d]\n",n);            break;                printf("n=[%d],buf=[%s]\n",n,buf);        //发送数据        write(cfd,buf,n);        //关闭套接字    close(lfd);    return 0;``` - client端： ```c/*tcp本地套接字客户端流程：    调用socket创建套接字    调用bind函数将socket文件描述和socket文件进行绑定.        不是必须的, 若无显示绑定会进行隐式绑定，但服务器不知道谁连接了.    调用connect函数连接服务端    循环通信read-write    关闭文件描述符 close*///本地socket通信客户端#include #include #include #include #include #include #include #include int main()    //创建socket    int cfd = socket(AF_UNIX,SOCK_STREAM,0);//tcp流程    if(cfd<0)        perror("socket error");        return -1;        //删除socket文件，避免bind失败(如果套接字存在，删除套接字)    unlink("./client.sock");    //绑定    struct sockaddr_un client;    bzero(&client,sizeof(client));    client.sun_family= AF_UNIX;    strcpy(client.sun_path,"./client.sock");    int ret = bind(cfd,(struct sockaddr*)&client,sizeof(client));    if(ret<0)        perror("bind error");        return -1;        struct sockaddr_un serv;    bzero(&serv,sizeof(serv));    serv.sun_family = AF_UNIX;    strcpy(serv.sun_path,"./server.sock");    ret = connect(cfd,(struct sockaddr*)&serv,sizeof(serv));    if(ret<0)        perror("connect error");        return -1;        int n;    char buf[1024];    while(1)        memset(buf,0x00,sizeof(buf));        n = read(STDIN_FILENO,buf,sizeof(buf));        //发送数据        write(cfd,buf,n);        //读取数据        memset(buf,0x00,sizeof(buf));        n = read(cfd,buf,sizeof(buf));        if(n<=0)            printf("read error or client close ,n=[%d]",n);            break;                printf("n=[%d],buf=[%s]",n,buf);        close(cfd);    return 0;

UDP localSocket流程：

• server端：

/*（1）创建UNIX域数据报套接字；socket(AF_LOCAL, SOCK_DGRAM, 0)（2）填充本地信息结构体（服务器）；struct sockaddr_un（3）绑定本地地址(服务器的地址信息)；bind( )（4）接收客户端的数据；recvfrom( )（5）发送数据给客户端；sendto( )*/#include#include#include#include#include#include#include#include#include #define N 64 int main(int argc, const char *argv[])    int sockfd;    struct sockaddr_un serveraddr, clientaddr;    char buf[N];    socklen_t len = sizeof(clientaddr);    sockfd = socket(AF_LOCAL, SOCK_DGRAM, 0);//udp流程    if(sockfd < 0)            perror("fail to sockfd");        return -1;        //删除socket文件，避免bind失败(如果套接字存在，删除套接字)    unlink("mysocket");        serveraddr.sun_family = AF_LOCAL;    strcpy(serveraddr.sun_path, "mysocket");    unlink(serveraddr.sun_path);    if(bind(sockfd, (struct sockaddr*)&serveraddr, sizeof(serveraddr)) < 0)            perror("fail to bind");        return -1;         while(1)            if(recvfrom(sockfd, buf, N, 0, (struct sockaddr*)&clientaddr, &len) < 0)                    perror("fail to recvfrom");            return -1;                if(strncmp(buf, "quit", 4) == 0)                    break;                buf[strlen(buf) - 1] = "\0";        printf("buf:%s\n", buf);        strcat(buf, "++++----");        if(sendto(sockfd, buf, N, 0, (struct sockaddr*)&clientaddr, sizeof(clientaddr)) < 0)                    perror("fail to sendto");            return -1;                close(sockfd);    return 0;

• client端：

/*客户端使用流程：（1）创建UNIX域数据报套接字；socket(AF_LOCAL, SOCK_DGRAM, 0)（2）填充本地信息结构体（服务器端和客户端）；struct sockaddr_un（3）绑定本地地址(客户端的地址信息)；bind( )（4）发送数据给服务器端；sendto( )（5）接收服务器端的数据；recvfrom( )*/#include#include#include#include#include#include#include#include#include #define N 64 int main(int argc, const char *argv[])    int sockfd;    char buf[N];    struct sockaddr_un serveraddr, clientaddr;         sockfd = socket(AF_LOCAL, SOCK_DGRAM, 0);//udp流程    if(sockfd < 0)            perror("fail to sockfd");        return -1;         //删除socket文件，避免bind失败(如果套接字存在，删除套接字)    unlink("mysocket");     serveraddr.sun_family = AF_LOCAL;    strcpy(serveraddr.sun_path, "mysocket");     clientaddr.sun_family = AF_LOCAL;    strcpy(clientaddr.sun_path, "socket");    unlink(clientaddr.sun_path);    if(bind(sockfd, (struct sockaddr*)&clientaddr, sizeof(clientaddr)) < 0)            perror("fail to bind");        return -1;         while(1)            printf("");        fgets(buf, N, stdin);        if(sendto(sockfd, buf, N, 0, (struct sockaddr*)&serveraddr, sizeof(serveraddr)) < 0)                    perror("fail to sendto");            return -1;                if(strncmp(buf, "quit", 4) == 0)                    break;                if(recvfrom(sockfd, buf, N, 0, NULL, NULL) < 0)                    perror("fail to recvfrom");            return -1;                printf("buf:%s\n", buf);        close(sockfd);     return 0;

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