[001]socket通信--server和client实现迭代的简单例子

server端：

 #include<stdio.h>
 #include<stdlib.h>
 #include<string.h>
 #include<unistd.h>
 #include<arpa/inet.h>
 #include<sys/socket.h>

 #define BUFF_SIZE 1024
 void error_handling(char* message);

 void error_handling(char* message) {
     fputs(message, stderr);
     fputc('\n', stderr);
     exit();
 }

 int main(int argc, char **argv)
 {
     int serv_sock;
      int clnt_sock;
     char message[BUFF_SIZE];
     int i,str_len;

     //设置一个server地址serv_addr,client地址clnt_addr
     struct sockaddr_in serv_addr;
     struct sockaddr_in clnt_addr;
     socklen_t clnt_addr_size = sizeof(clnt_addr);

     memset(&serv_addr, , sizeof(serv_addr));
     memset(&serv_addr, , sizeof(serv_addr));

     if (argc != ) {
         printf("Usage : %s <port>\n", argv[]);
         exit();
     }

     //创建用于internet的流协议(TCP)socket
     serv_sock = socket(PF_INET, SOCK_STREAM, );
     if (serv_sock == -) {
         error_handling("socket() error");
     }

     serv_addr.sin_family = AF_INET;
     serv_addr.sin_addr.s_addr = htonl(INADDR_ANY);
     serv_addr.sin_port = htons(atoi(argv[]));

     //把socket和socket地址结构联系起来
     if( bind(serv_sock,(struct sockaddr*)&serv_addr,sizeof(serv_addr)) == -) {
         error_handling("bind() error");
     }

     //server_socket用于监听
     if ( listen(serv_sock, ) == -) {
         error_handling("lisen() error");
     }

     // 受理连接请求
     for (i = ; i < ; i++) {
         clnt_sock = accept(serv_sock,(struct sockaddr*)&clnt_addr,&clnt_addr_size);
         if ( clnt_sock == -) {
             error_handling("accept() error");
         } else {
             printf("connected client %d \n", i+);
         }

         while((str_len = read(clnt_sock, message, BUFF_SIZE)) != ) {
             write(clnt_sock, message, str_len);
         }

         close(clnt_sock);
     }
     close(serv_sock);

     return ;
 }

client端：

 #include<stdio.h>
 #include<stdlib.h>
 #include<string.h>
 #include<unistd.h>
 #include<arpa/inet.h>
 #include<sys/socket.h>

 #define BUFF_SIZE 1024
 void error_handling(char* message);

 void error_handling(char* message) {
     fputs(message, stderr);
     fputc('\n', stderr);
     exit();
 }

 int main(int argc, char **argv) {
     int sock;
     struct sockaddr_in serv_addr;
     char message[BUFF_SIZE];
     int str_len;
     memset(&serv_addr, , sizeof(serv_addr));

     if (argc != )
     {
         printf("Usage: /%s <IP> <Port>\n",argv[]);
         exit();
     }

     //创建用于internet的流协议(TCP)socket
     sock = socket(PF_INET, SOCK_STREAM, );
     if (sock == -) {
         error_handling("socket() error");
     }

     //设置一个socket地址结构client_addr,代表客户机internet地址, 端口
     serv_addr.sin_family = AF_INET;
     serv_addr.sin_addr.s_addr = inet_addr(argv[]);
     serv_addr.sin_port = htons(atoi(argv[]));

     //把socket和socket地址结构联系起来
     if( connect(sock,(struct sockaddr*)&serv_addr,sizeof(serv_addr)) == -) {
         error_handling("connect() error");
     } else {
         printf("connected.......\n");
     }

     while() {
         fputs("Input mesage(Q to quit) : ", stdout);
         fgets(message, BUFF_SIZE, stdin);

         if (!strcmp(message, "q\n") || !strcmp(message, "Q\n")) {
             break;
         }

         write(sock, message, strlen(message));
         str_len = read(sock, message, BUFF_SIZE - );
         message[str_len] = ;
         printf("Message from server : %s \n", message);
     }
     close(sock);
     return ;
 }