[001]socket通信--server和client实现迭代的简单例子
server端：
1 #include<stdio.h> 2 #include<stdlib.h> 3 #include<string.h> 4 #include<unistd.h> 5 #include<arpa/inet.h> 6 #include<sys/socket.h> 7 8 #define BUFF_SIZE 1024 9 void error_handling(char* message); 10 11 void error_handling(char* message) { 12 fputs(message, stderr); 13 fputc('\n', stderr); 14 exit(1); 15 } 16 17 int main(int argc, char **argv) 18 { 19 int serv_sock; 20 int clnt_sock; 21 char message[BUFF_SIZE]; 22 int i,str_len; 23 24 //设置一个server地址serv_addr,client地址clnt_addr 25 struct sockaddr_in serv_addr; 26 struct sockaddr_in clnt_addr; 27 socklen_t clnt_addr_size = sizeof(clnt_addr); 28 29 memset(&serv_addr, 0, sizeof(serv_addr)); 30 memset(&serv_addr, 0, sizeof(serv_addr)); 31 32 if (argc != 2) { 33 printf("Usage : %s <port>\n", argv[0]); 34 exit(1); 35 } 36 37 //创建用于internet的流协议(TCP)socket 38 serv_sock = socket(PF_INET, SOCK_STREAM, 0); 39 if (serv_sock == -1) { 40 error_handling("socket() error"); 41 } 42 43 serv_addr.sin_family = AF_INET; 44 serv_addr.sin_addr.s_addr = htonl(INADDR_ANY); 45 serv_addr.sin_port = htons(atoi(argv[1])); 46 47 //把socket和socket地址结构联系起来 48 if( bind(serv_sock,(struct sockaddr*)&serv_addr,sizeof(serv_addr)) == -1) { 49 error_handling("bind() error"); 50 } 51 52 //server_socket用于监听 53 if ( listen(serv_sock, 5) == -1) { 54 error_handling("lisen() error"); 55 } 56 57 // 受理连接请求 58 for (i = 0; i < 5; i++) { 59 clnt_sock = accept(serv_sock,(struct sockaddr*)&clnt_addr,&clnt_addr_size); 60 if ( clnt_sock == -1) { 61 error_handling("accept() error"); 62 } else { 63 printf("connected client %d \n", i+1); 64 } 65 66 while((str_len = read(clnt_sock, message, BUFF_SIZE)) != 0) { 67 write(clnt_sock, message, str_len); 68 } 69 70 close(clnt_sock); 71 } 72 close(serv_sock); 73 74 return 0; 75 }
client端：
1 #include<stdio.h> 2 #include<stdlib.h> 3 #include<string.h> 4 #include<unistd.h> 5 #include<arpa/inet.h> 6 #include<sys/socket.h> 7 8 #define BUFF_SIZE 1024 9 void error_handling(char* message); 10 11 void error_handling(char* message) { 12 fputs(message, stderr); 13 fputc('\n', stderr); 14 exit(1); 15 } 16 17 int main(int argc, char **argv) { 18 int sock; 19 struct sockaddr_in serv_addr; 20 char message[BUFF_SIZE]; 21 int str_len; 22 memset(&serv_addr, 0, sizeof(serv_addr)); 23 24 if (argc != 3) 25 { 26 printf("Usage: /%s <IP> <Port>\n",argv[0]); 27 exit(1); 28 } 29 30 //创建用于internet的流协议(TCP)socket 31 sock = socket(PF_INET, SOCK_STREAM, 0); 32 if (sock == -1) { 33 error_handling("socket() error"); 34 } 35 36 //设置一个socket地址结构client_addr,代表客户机internet地址, 端口 37 serv_addr.sin_family = AF_INET; 38 serv_addr.sin_addr.s_addr = inet_addr(argv[1]); 39 serv_addr.sin_port = htons(atoi(argv[2])); 40 41 //把socket和socket地址结构联系起来 42 if( connect(sock,(struct sockaddr*)&serv_addr,sizeof(serv_addr)) == -1) { 43 error_handling("connect() error"); 44 } else { 45 printf("connected.......\n"); 46 } 47 48 while(1) { 49 fputs("Input mesage(Q to quit) : ", stdout); 50 fgets(message, BUFF_SIZE, stdin); 51 52 if (!strcmp(message, "q\n") || !strcmp(message, "Q\n")) { 53 break; 54 } 55 56 write(sock, message, strlen(message)); 57 str_len = read(sock, message, BUFF_SIZE - 1); 58 message[str_len] = 0; 59 printf("Message from server : %s \n", message); 60 } 61 close(sock); 62 return 0; 63 }
