Установка время через /dev/rtc

#include <stdio.h>
#include <stdlib.h>
#include <linux/rtc.h>
#include <sys/ioctl.h>
#include <fcntl.h>
#include <unistd.h>
#include <errno.h>
#include <time.h>
 
 
 
int main(int argc, char **argv) {
 
    int fd;
    struct rtc_time settime_hw;
    struct rtc_time currtime_hw;
 
    settime_hw.tm_sec = 32;
    settime_hw.tm_min = 16;
    settime_hw.tm_hour = 8;
    settime_hw.tm_mday = 13;
    settime_hw.tm_mon = 6 - 1;
    settime_hw.tm_year = 2013 - 1900;
 
 
    fd = open("/dev/rtc", O_RDONLY);
    if (fd < 0) {
        printf("Error: %d\n", errno);
        exit(EXIT_FAILURE);
    }
 
    if (ioctl(fd, RTC_RD_TIME, &currtime_hw) < 0) {
        printf("Error: %d\n", errno);
        exit(EXIT_FAILURE);
    }
 
    printf("Time befor set: %d.%02d.%02d %02d:%02d:%02d\n",
            currtime_hw.tm_year + 1900, currtime_hw.tm_mon + 1,
            currtime_hw.tm_mday, currtime_hw.tm_hour,
            currtime_hw.tm_min, currtime_hw.tm_sec);
 
    if (ioctl(fd, RTC_SET_TIME, &settime_hw) < 0) {
        printf("Error: %d\n", errno);
        exit(EXIT_FAILURE);
    }
 
    if (ioctl(fd, RTC_RD_TIME, &currtime_hw) < 0) {
        printf("Error: %d\n", errno);
        exit(EXIT_FAILURE);
    }
 
    printf("Time after set: %d.%02d.%02d %02d:%02d:%02d\n",
            currtime_hw.tm_year + 1900, currtime_hw.tm_mon + 1,
            currtime_hw.tm_mday, currtime_hw.tm_hour,
            currtime_hw.tm_min, currtime_hw.tm_sec);
 
    close(fd);
 
    return EXIT_SUCCESS;
}

#include <stdio.h>
#include <stdlib.h>
#include <linux/rtc.h>
#include <sys/ioctl.h>
#include <fcntl.h>
#include <unistd.h>
#include <errno.h>
#include <time.h>
 
 
 
int main(int argc, char **argv) {
 
    int fd;
    struct rtc_time currtime_hw;
    struct tm time_test;
    time_t time_stamp;
    unsigned long time_output;
 
    fd = open("/dev/rtc", O_RDONLY);
    if (fd < 0) {
        printf("Error: %d\n", errno);
        exit(EXIT_FAILURE);
    }
 
    if (ioctl(fd, RTC_RD_TIME, &currtime_hw) < 0) {
        printf("Error: %d\n", errno);
        exit(EXIT_FAILURE);
    }
 
    printf("Time befor set: %d.%02d.%02d %02d:%02d:%02d\n",
            currtime_hw.tm_year + 1900, currtime_hw.tm_mon + 1,
            currtime_hw.tm_mday, currtime_hw.tm_hour,
            currtime_hw.tm_min, currtime_hw.tm_sec);
 
 
    time_test.tm_sec = 32;
    time_test.tm_min = 16;
    time_test.tm_hour = 8;
    time_test.tm_mday = 13;
    time_test.tm_mon = 6 - 1;
    time_test.tm_year = 2013 - 1900;
 
    time_stamp = mktime(&time_test);
 
    time_output = (unsigned long) time_stamp;
 
    if (ioctl(fd, RTC_EPOCH_SET, time_output) < 0) {
        printf("Error: %d\n", errno);
        exit(EXIT_FAILURE);
    }
 
    if (ioctl(fd, RTC_RD_TIME, &currtime_hw) < 0) {
        printf("Error: %d\n", errno);
        exit(EXIT_FAILURE);
    }
 
    printf("Time after set: %d.%02d.%02d %02d:%02d:%02d\n",
            currtime_hw.tm_year + 1900, currtime_hw.tm_mon + 1,
            currtime_hw.tm_mday, currtime_hw.tm_hour,
            currtime_hw.tm_min, currtime_hw.tm_sec);
 
    close(fd);
 
    return EXIT_SUCCESS;
}