#ifndef NTPCLIENT_H  
#define NTPCLIENT_H  
  
#include <stdio.h>  
#include <stdlib.h>  
#include <string.h>  
#include <sys/socket.h>  
#include <netinet/in.h>  
#include <arpa/inet.h>  
#include <unistd.h>  
#include <time.h>  
#include <errno.h>  
    
#define NTP_PORT 123  
#define NTP_PACKET_SIZE 48  

typedef struct NTPClient_s {  
    int sockfd;  
    struct sockaddr server_addr;  
    char ntp_packet[NTP_PACKET_SIZE];
    struct addrinfo *res;
    int  flag; 
    char *server;
    int  port;
} NTPClient;  
    
NTPClient* createNTPClient(const char* ntp_server, int port, int timeout_sec);

// 销毁NTP客户端实例  
void destroyNTPClient(NTPClient* client) ;

// 从NTP服务器获取当前时间  
int getCurrentTimeFromNTP(NTPClient* client, time_t* current_time) ;

// 根据时间获取星期信息
int getCurrentWeekday(time_t  current_time,char *weekday) ;


#endif // NTPCLIENT_H