for (i = 0; i <= maxi; i++) {
if ( (sockfd = client[i].fd) < 0) //如果客户端描述符小于0，则没有客户端连接，检测下一个
continue;
if (FD_ISSET(sockfd, &rset)) { //检测此客户端socket是否有数据
printf("recv occured for connect fd[%d].\n",i);
if ( (n = recv(sockfd, recvbuf, MAXDATASIZE,0)) == 0) { //从客户端socket读数据，等于0表示网络中断
close(sockfd); //关闭socket连接
printf("Client( %s ) closed connection. User's data: %s\n",client[i].name,client[i].data);
FD_CLR(sockfd, &allset); //从监听集合中删除此socket连接
client[i].fd = -1; //数组元素设初始值，表示没客户端连接
delete client[i].name;
delete client[i].data;
} else
process_cli(&client[i], recvbuf, n); //接收到客户数据，开始处理
if (--nready <= 0)
break; //如果没有新客户端有数据，跳出for循环回到while循环
}
}
}
close(listenfd); //关闭服务器监听socket
}
void process_cli(CLIENT *client, char* recvbuf, int len)
{
char sendbuf[MAXDATASIZE];
recvbuf[len-1] = '\0';
if (strlen(client->name) == 0) {
memcpy(client->name,recvbuf, len);
printf("Client's name is %s.\n",client->name);
return;
}
printf("Received client( %s ) message: %s\n",client->name, recvbuf);
savedata(recvbuf,len, client->data);
for (int i1 = 0; i1 < len - 1; i1++) {
sendbuf[i1] = recvbuf[len - i1 -2];
}
sendbuf[len - 1] = '\0';
send(client->fd,sendbuf,strlen(sendbuf),0);
}
void savedata(char* recvbuf, int len, char* data)
{
int start = strlen(data);
for (int i = 0; i < len; i++) {
data[start + i] = recvbuf[i];
}
}