#include <iostream>

#include <time.h>
#include <sys/time.h>
#include <sys/ioctl.h>
#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <linux/rtc.h>
#include <linux/ioctl.h>




using namespace std;


int main()
{
    struct rtc_time rtc_tm;
    int rtc_fd;
    int ret;
    int retClose;

    rtc_tm.tm_mday = 31;
    rtc_tm.tm_mon = 4;
    rtc_tm.tm_year = 104;
    rtc_tm.tm_hour = 2;
    rtc_tm.tm_min = 30;
    rtc_tm.tm_sec = 0;

    rtc_fd = open("/dev/rtc", O_RDONLY,0);
    if (rtc_fd == -1)
    {
        printf("/dev/rtc open error\n");
        printf("error code: %d\n", rtc_fd);
        cin.get() ;
        exit(1);
    }

    printf("rtc_fd: %d\n", rtc_fd);

    ret = ioctl(rtc_fd, RTC_SET_TIME, &rtc_tm);
    printf("RTC_SET_TIME: %d\n", _IOW('p', 0x0a, struct rtc_time));
    if (ret == -1)
    {
        printf("rtc ioctl RTC_SET_TIME error\r\n");
        printf("error code: %d\n", ret);
        cin.get() ;
        exit(1);
    }


    printf("ret: %d\n", ret);
    retClose = close(rtc_fd);
    printf("retClose: %d\n", retClose);
    printf("no error\r\n");
    cin.get() ;
    return 0;
}