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1 简单回声服务器的实现

实现非常非常简单，而且没啥实用价值，代码如下：

server.c：

#include 
   
    #include 
    
     #include 
     
      #include 
      
       #include 
       
        #include 
        
         #include 
         
          #define SERVER_PORT 666int main(void){ int sock;//代表信箱 struct sockaddr_in server_addr; //1.美女创建信箱 sock = socket(AF_INET, SOCK_STREAM, 0); //2.清空标签，写上地址和端口号 bzero(&server_addr, sizeof(server_addr)); server_addr.sin_family = AF_INET;//选择协议族IPV4 server_addr.sin_addr.s_addr = htonl(INADDR_ANY);//监听本地所有IP地址 server_addr.sin_port = htons(SERVER_PORT);//绑定端口号 //实现标签贴到收信得信箱上 bind(sock, (struct sockaddr *)&server_addr, sizeof(server_addr)); //把信箱挂置到传达室，这样，就可以接收信件了 listen(sock, 128); //万事俱备，只等来信 printf("等待客户端的连接\n"); int done =1; while(done){ struct sockaddr_in client; int client_sock, len; char client_ip[64]; char buf[256]; socklen_t client_addr_len; client_addr_len = sizeof(client); client_sock = accept(sock, (struct sockaddr *)&client, &client_addr_len); //打印客服端IP地址和端口号 printf("client ip: %s\t port : %d\n", inet_ntop(AF_INET, &client.sin_addr.s_addr,client_ip,sizeof(client_ip)), ntohs(client.sin_port)); /*读取客户端发送的数据*/ len = read(client_sock, buf, sizeof(buf)-1); buf[len] = '\0'; printf("receive[%d]: %s\n", len, buf); //转换成大写 for(i=0; i
          
           ='a' && buf[i]<='z'){ buf[i] = buf[i] - 32; }*/ buf[i] = toupper(buf[i]); } len = write(client_sock, buf, len); printf("finished. len: %d\n", len); close(client_sock);} close(sock); return 0;}
          
         
        
       
      
     
    
   

client.c：

#include 
   
    #include 
    
     #include 
     
      #include 
      
       #include 
       
        #include 
        
         #define SERVER_PORT 666#define SERVER_IP "127.0.0.1"int main(int argc, char *argv[]){ int sockfd; char *message; struct sockaddr_in servaddr; int n; char buf[64]; if(argc != 2){ fputs("Usage: ./echo_client message \n", stderr); exit(1); } message = argv[1]; printf("message: %s\n", message); sockfd = socket(AF_INET, SOCK_STREAM, 0); memset(&servaddr, '\0', sizeof(struct sockaddr_in)); servaddr.sin_family = AF_INET; inet_pton(AF_INET, SERVER_IP, &servaddr.sin_addr); servaddr.sin_port = htons(SERVER_PORT); connect(sockfd, (struct sockaddr *)&servaddr, sizeof(servaddr)); write(sockfd, message, strlen(message)); n = read(sockfd, buf, sizeof(buf)-1); if(n>0){ buf[n]='\0'; printf("receive: %s\n", buf); }else { perror("error!!!"); } printf("finished.\n"); close(sockfd); return 0;}
        
       
      
     
    
   

参考资料：

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