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#include <string.h>
#include <unistd.h>
#include <sys/time.h>
#include <time.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdio.h>
#include <sys/ioctl.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <unistd.h>
#include <linux/rtc.h>
/*
* This is meant to synchronise the system clock with the RTC at
* startup. If you know a better way of doing this in Android,
* drop me an email at kevin.petit@arm.com
*/
static time_t read_rtc(void)
{
struct tm tm_time;
int fd;
fd = open("/dev/rtc0", O_RDONLY);
printf("Got fd = %d for RTC\n", fd);
/* Read time from the RTC */
memset(&tm_time, 0, sizeof(tm_time));
if (ioctl(fd, RTC_RD_TIME, &tm_time)) {
fprintf(stderr, "error while doing RTC_RD_TIME: %s\n", strerror(errno));
}
tm_time.tm_isdst = -1; /* "not known" */
printf("TIME FROM RTC: %s\n", asctime(&tm_time));
close(fd);
return mktime(&tm_time);
}
static void rtc_to_sys_clock(void)
{
struct timeval tv;
uint64_t timelog;
tv.tv_sec = read_rtc();
timelog = tv.tv_sec;
printf("Got tv.tv_sec = %llu\n", timelog);
tv.tv_usec = 0;
if (settimeofday(&tv, NULL))
fprintf(stderr, "settimeofday failed: %s\n", strerror(errno));
}
int main(int argc, char **argv)
{
(void)argc;
(void)argv;
rtc_to_sys_clock();
return 0;
}
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