帮我生成一个基于C语言的时间同步检测代码

以下是一个基于C语言的时间同步检测代码，它使用了NTP协议来获取网络时间并与本地时间进行比较，以确定系统时钟是否同步。

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>

#define NTP_TIMESTAMP_DELTA 2208988800ull // NTP时间戳与UNIX时间戳之间的差值
#define NTP_PACKET_SIZE 48 // NTP数据包大小
#define NTP_PORT 123 // NTP服务器端口号

typedef struct {
    uint8_t li_vn_mode;      // Leap indicator, version and mode
    uint8_t stratum;         // Stratum level of the local clock
    uint8_t poll;            // Maximum interval between successive messages
    uint8_t precision;       // Precision of the local clock
    uint32_t rootDelay;      // Total round trip delay time
    uint32_t rootDispersion; // Max error aloud from primary clock source
    uint32_t refId;          // Reference clock identifier
    uint64_t refTm_s;        // Reference time-stamp seconds
    uint64_t refTm_f;        // Reference time-stamp fraction of a second
    uint64_t origTm_s;       // Originate time-stamp seconds
    uint64_t origTm_f;       // Originate time-stamp fraction of a second
    uint64_t rxTm_s;         // Received time-stamp seconds
    uint64_t rxTm_f;         // Received time-stamp fraction of a second
    uint64_t txTm_s;         // Transmit time-stamp seconds
    uint64_t txTm_f;         // Transmit time-stamp fraction of a second
} ntp_packet;

int main(int argc, char *argv[]) {
    int sockfd;
    struct sockaddr_in serv_addr;
    ntp_packet packet;
    memset(&packet, 0, sizeof(ntp_packet));
    packet.li_vn_mode = 0x1b; // NTP版本号为3，客户端模式，发送查询请求

    sockfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP); // 创建UDP套接字
    if (sockfd < 0) {
        perror("socket");
        exit(EXIT_FAILURE);
    }

    memset(&serv_addr, 0, sizeof(serv_addr));
    serv_addr.sin_family = AF_INET;
    serv_addr.sin_addr.s_addr = inet_addr("pool.ntp.org"); // NTP服务器地址
    serv_addr.sin_port = htons(NTP_PORT);

    if (sendto(sockfd, &packet, NTP_PACKET_SIZE, 0, (struct sockaddr *)&serv_addr, sizeof(serv_addr)) < 0) { // 发送NTP查询请求
        perror("sendto");
        exit(EXIT_FAILURE);
    }

    if (recvfrom(sockfd, &packet, NTP_PACKET_SIZE, 0, NULL, NULL) < 0) { // 接收NTP服务器响应
        perror("recvfrom");
        exit(EXIT_FAILURE);
    }

    close(sockfd);

    packet.txTm_s = ntohl(packet.txTm_s); // 将网络字节序转换为主机字节序
    packet.txTm_f = ntohl(packet.txTm_f);

    time_t txTm = (time_t)(packet.txTm_s - NTP_TIMESTAMP_DELTA); // 计算NTP时间戳对应的UNIX时间戳
    struct tm *tm = gmtime(&txTm); // 转换为UTC时间
    printf("NTP time: %s", asctime(tm));

    time_t localTm = time(NULL); // 获取本地时间
    tm = gmtime(&localTm); // 转换为UTC时间
    printf("Local time: %s", asctime(tm));

    double diff = difftime(localTm, txTm); // 计算本地时间与NTP时间的差值
    printf("Time difference: %f seconds\n", diff);

    if (diff < 1.0 && diff > -1.0) { // 判断本地时间与NTP时间是否同步
        printf("Time is synchronized.\n");
    } else {
        printf("Time is not synchronized.\n");
    }

    return 0;
}

该代码通过向NTP服务器发送查询请求，获取网络时间，并与本地时间进行比较，以确定系统时钟是否同步。如果本地时间与NTP时间的差值小于1秒，则认为时间已同步。