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fake-hwclock.c
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fake-hwclock.c
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#include <stdio.h>
#include <time.h>
#include <utime.h>
#include <sys/stat.h>
#include <sys/time.h>
/* If the difference between the last known time and current time
* is greater than this amount, we assume the clock is broken
* and reset it. */
static time_t max_diff = 60 * 60 * 24 * 365 * 10; /* ten years */
int main (int argc, char *argv[])
{
struct stat temp;
const char *timefile = argv[0];
time_t current_time;
time_t time_store;
time_t diff;
current_time = time(NULL);
if(current_time == ((time_t) - 1))
return 1;
if(stat(timefile, &temp) < 0)
return 1;
time_store = temp.st_mtime;
diff = time_store - current_time;
if(time_store > current_time || diff > max_diff || diff < -max_diff)
{
struct timeval sys_update;
sys_update.tv_sec =time_store;
sys_update.tv_usec=0;
printf("Setting Clock.\n");
settimeofday(&sys_update,NULL);
} else {
struct utimbuf time_update;
time_update.actime = temp.st_atime;
time_update.modtime = time(NULL);
printf("Saving current time.\n");
utime(timefile, &time_update);
}
return 0;
}