SOCKET代码示例

1、

/*serve_tcp.c*/ #include<stdio.h> #include<sys/socket.h> #include<netinet/in.h> #include<stdlib.h> #include<arpa/inet.h> #include<unistd.h> #include<string.h> int main(){ //创建套接字 int serv_sock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);//AF_INET ipv4 //初始化socket元素 struct sockaddr_in serv_addr; memset(&serv_addr, 0, sizeof(serv_addr)); serv_addr.sin_family = AF_INET; serv_addr.sin_addr.s_addr = inet_addr("127.0.0.1"); serv_addr.sin_port = htons(1234); //绑定文件描述符和服务器的ip和端口号 bind(serv_sock, (struct sockaddr*)&serv_addr, sizeof(serv_addr)); //进入监听状态，等待用户发起请求 listen(serv_sock, 20); //接受客户端请求 //定义客户端的套接字，这里返回一个新的套接字，后面通信时，就用这个clnt_sock进行通信 struct sockaddr_in clnt_addr;//ipv4 socklen_t clnt_addr_size = sizeof(clnt_addr); int clnt_sock = accept(serv_sock, (struct sockaddr*)&clnt_addr, &clnt_addr_size); //接收客户端数据，并相应 char str[256]; read(clnt_sock, str, sizeof(str)); printf("client send: %s\n",str); strcat(str, "+ACK"); write(clnt_sock, str, sizeof(str)); //关闭套接字 close(clnt_sock); close(serv_sock); return 0; }

2、

/*client_tcp.c*/ #include<stdio.h> #include<string.h> #include<stdlib.h> #include<unistd.h> #include<arpa/inet.h> #include<sys/socket.h> int main(){ //创建套接字 int sock = socket(AF_INET, SOCK_STREAM, 0); //服务器的ip为本地，端口号1234 struct sockaddr_in serv_addr; memset(&serv_addr, 0, sizeof(serv_addr)); serv_addr.sin_family = AF_INET; serv_addr.sin_addr.s_addr = inet_addr("127.0.0.1"); serv_addr.sin_port = htons(1234); //向服务器发送连接请求 connect(sock, (struct sockaddr*)&serv_addr, sizeof(serv_addr));//bang //发送并接收数据 char buffer[40]; printf("Please write:"); scanf("%s", buffer); write(sock, buffer, sizeof(buffer)); read(sock, buffer, sizeof(buffer) - 1); printf("Serve send: %s\n", buffer); //断开连接 close(sock); return 0; }