#include <sys/ioctl.h>
#include <sys/utsname.h>
#include <ctype.h>
#include <fcntl.h>
#include <getopt.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include <time.h>
#include <stdio.h>
struct linux_rtc_time {
int tm_sec;
int tm_min;
int tm_hour;
int tm_mday;
int tm_mon;
int tm_year;
int tm_wday;
int tm_yday;
int tm_isdst;
};
#define RTC_SET_TIME _IOW('p', 0x0a, struct linux_rtc_time) /* Set RTC time */
#define RTC_RD_TIME _IOR('p', 0x09, struct linux_rtc_time) /* Read RTC time */
int main()
{
int rtc;
struct tm tm;
time_t t;
struct timeval tv = { 0, 0 };
struct timezone tz = { 0, 0 };
int utc = 1;
if ( gettimeofday ( &tv, &tz ))
printf( "gettimeofday() failed" );
t = tv.tv_sec;
return 0;
if (( rtc = open ( "/dev/rtc0", O_WRONLY )) < 0 ) {
if (( rtc = open ( "/dev/misc/rtc0", O_WRONLY )) < 0 )
printf( "Could not access RTC" );
}
tm = *( utc ? gmtime ( &t ) : localtime ( &t ));
tm.tm_isdst = 0;
if ( ioctl ( rtc, RTC_SET_TIME, &tm ) < 0 )
printf( "Could not set the RTC time" );
close ( rtc );
return 0;
}