UDP迭代服务器C ++代码

Question

这是我的服务器。我想使用UDP创建迭代服务器，但它的客户端不会退出，第二个客户端会收到消息。这不是迭代服务器。你能告诉我一个方法让新客户等到第一个客户退出吗？

------------ UDP ITERATIVE SERVER ----------

#include <iostream>
#include "config.h"
#include <arpa/inet.h>
#include "unp.h"
using namespace std; 
int main() {
    int sockfd=socket(AF_INET,SOCK_DGRAM,0);
    if (sockfd==-1) {
        cout<<"ERROR WHILE CREATING SOCKET"<<endl;
        exit(0);
    }
    else {
        cout<<"SOCKET CREATED SUCCESSFULLY"<<endl;
    }
    struct sockaddr_in server;
    server.sin_port=htons(4444);
    server.sin_family=AF_INET;
    memset(&(server.sin_zero),'\0',8);
    server.sin_addr.s_addr=inet_addr("127.0.0.1");
    int trybind=bind(sockfd,(struct sockaddr*)&server,sizeof(struct sockaddr));
    if (trybind==-1) {
        cout<<"ERROR WHILE BINDING ..."<<endl;
        exit(0);
    }
    char msg[100],tosend[100];

    if (trybind==0) {
        cout<<"binded successfully"<<endl;}
        while(1) {
            struct sockaddr_in client;   
            socklen_t sizee=sizeof(client);    
            while(recvfrom(sockfd,msg,100,0,(struct sockaddr*)&client,&sizee)) {
                cout<<"CLIENT : "<<msg<<endl;
                cout<<"[CLIENT's PORT NUMBER :]"<<htons(client.sin_port)<<endl ;
                char* clientip[100];
                //socklen_t sizE=sizeof(client);
                //clientip=inet_ntop(AF_INET, &(client.sin_addr), clientip, &sizee);

                cout<<"[CLIENT's IP Address  :] "<<inet_ntoa(client.sin_addr)<<endl;
                if (strcmp(msg,"quit")!=0) {
                    cout<<"SERVER :";
                    cin.getline(tosend,100);
                    cout<<endl;
                    int sen=sendto(sockfd,tosend,100,0,(struct sockaddr*)&client,sizee);  
                }
            }  
        }
    }
}

*************客户***********

#include <iostream>
#include "config.h"
#include "unp.h"
using namespace std;
int main() {
    int sockfd=socket(AF_INET,SOCK_DGRAM,0);
    if(sockfd==-1) {
        cout<<"ERROR WHILE CREATING SOCKET"<<endl;
        exit(0);
    }
    else {
        cout<<"SOCKET CREATED SUCCESSFULLY"<<endl;
    }
    struct sockaddr_in server;
    server.sin_port=htons(4444);
    server.sin_family=AF_INET;
    memset(&(server.sin_zero),'\0',8);
    server.sin_addr.s_addr=inet_addr("127.0.0.1");    
    while(1) {
        char msg[100],tosend[100];
        cout<<"CLIENT:";
        cin.getline(tosend,100);
        cout<<endl;
        if (strcmp(tosend,"quit")==0) {
            cout<<"quiting"<<endl;
            exit(0);
        }
        socklen_t sizee=sizeof(server);    
        int sen=sendto(sockfd,tosend,100,0,(struct sockaddr*)&server,sizee);
        //struct sockaddr_in client;            
        int rec=recvfrom(sockfd,msg,100,0,(struct sockaddr*)&server,&sizee);    
        cout<<"SERVER : "<<msg<<endl;    
    }
}