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Linux Socket编程：基于TCP/IP的客户端与服务端通讯实例

服务端代码

#include 
   
    #include 
    
     #include 
     
      #include 
      
       #include 
       
        #include 
        
         int main(int argc, char *argv[]){ int serv_sock, clnt_sock; struct sockaddr_in serv_addr, clnt_addr; socklen_t clnt_addr_size; if (argc != 2) { printf("Usage: %s 
         
          \n", argv[0]); exit(1); } serv_sock = socket(AF_INET, SOCK_STREAM, 0); if (serv_sock < 0) { printf("sock() error\n"); exit(1); } memset(&serv_addr, 0, sizeof(serv_addr)); serv_addr.sin_family = AF_INET; serv_addr.sin_addr.s_addr = htonl(INADDR_ANY); serv_addr.sin_port = htons(atoi(argv[1])); int optval = 1; // setting address and port reusable setsockopt(serv_sock, SOL_SOCKET, SO_REUSEADDR, &optval, sizeof(optval)); if (bind(serv_sock, (struct sockaddr*)&serv_addr, sizeof(serv_addr)) < 0) { printf("bind() error\n"); exit(1); } if (listen(serv_sock, 5) < 0) { printf("listen() error\n"); exit(1); } clnt_addr_size = sizeof(clnt_addr); clnt_sock = accept(serv_sock, (struct sockaddr*)&clnt_addr, &clnt_addr_size); if (clnt_sock < 0) { printf("accept() error\n"); exit(1); } char buf[1024]; printf("connected with ip: %s and port: %d\n", inet_ntop(AF_INET, &clnt_addr.sin_addr, buf, 1024), ntohs(clnt_addr.sin_port)); while (1) { memset(buf, 0, sizeof(buf)); ssize_t size = read(clnt_sock, buf, sizeof(buf) - 1); if (size < 0) { printf("read() error\n"); break; } else { printf("client#: %s\n", buf); } } close(clnt_sock); close(serv_sock); return 0;}
         
        
       
      
     
    
   

客户端代码

#include 
   
    #include 
    
     #include 
     
      #include 
      
       #include 
       
        #include 
        
         int main(int argc, char *argv[]){ int clnt_sock; struct sockaddr_in serv_addr; int str_len; if (argc != 3) { printf("Usage: %s 
          
          
           \n", argv[0]); exit(1); } clnt_sock = socket(AF_INET, SOCK_STREAM, 0); if (clnt_sock < 0) { printf("sock() error\n"); exit(1); } memset(&serv_addr, 0, sizeof(serv_addr)); serv_addr.sin_family = AF_INET; serv_addr.sin_addr.s_addr = inet_addr(argv[1]); serv_addr.sin_port = htons(atoi(argv[2])); if (connect(clnt_sock, (struct sockaddr*)&serv_addr, sizeof(serv_addr)) == -1) { printf("connect() error\n"); exit(1); } char buf[1024]; while (1) { memset(buf, 0, sizeof(buf)); printf("client enter: "); fflush(stdout); ssize_t size = read(0, buf, sizeof(buf) - 1); if (size < 0) { printf("read() error\n"); break; } else { buf[size - 1] = '\0'; } write(clnt_sock, buf, strlen(buf)); } close(clnt_sock); return 0;}
          
         
        
       
      
     
    
   

使用方法

编译：

$ gcc hello_server.c -o hello_server$ gcc hello_client.c -o hello_client

打开终端：

$ ./hello_server 8888

打开另一个终端：

$ ./hello_client 127.0.0.1 8888

运行结果

客户端：

$ ./hello_client 127.0.0.1 8888client please enter: 123client please enter: 456client please enter:

服务端：

$ ./hello_server 8888connected with ip: 127.0.0.1 and port: xxxxclient#: 123client#: 456

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