#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <linux/rtc.h>

main()
{
    struct rtc_time rtc_time;
    int fd;
    char data[BUFSIZ];
    int irqfre;
    int ret;

    fd = open("/dev/rtc", O_RDWR);
    if (fd < 0) {
        printf("can't open /dev/rtc\n");
        return;
    }

    ret = ioctl(fd, RTC_IRQP_READ, &irqfre);
    if (ret == 0) {
        /*
        printf("Rate: %d\n", irqfre);
        */
        irqfre =  1024;
        ret = ioctl(fd, RTC_IRQP_SET, irqfre);
    }
    if (ret < 0) {
        printf("Can't read periodic IRQ's\n");
    }

    ret = ioctl(fd, RTC_PIE_ON, NULL);
    if (ret < 0) {
        printf("can't set the periodic irq\n");
        close(fd);
        return;
    }

    
    while(read(fd, &data, sizeof(data)) > 0) {
        printf("Intr\n");
    }
    
}