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Add RTC #1

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42 changes: 42 additions & 0 deletions ntpc.c
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Original file line number Diff line number Diff line change
Expand Up @@ -11,6 +11,10 @@
#include <sys/time.h>
#include <signal.h>
#include <syslog.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <linux/rtc.h>
#include <errno.h>

#define I_MISC 0
#define I_ORTIME 6
Expand All @@ -25,6 +29,9 @@
#endif


void syncToRTC();


// 0 = ok, 1 = failed, 2 = permanent failure
static int ntpc(struct in_addr addr)
{
Expand Down Expand Up @@ -127,6 +134,8 @@ static int ntpc(struct in_addr addr)

strftime(s, sizeof(s), "%a, %d %b %Y %H:%M:%S %z", localtime(&tv.tv_sec));
sprintf(q, "Time Updated: %s [%s%lds]", s, diff > 0 ? "+" : "", diff);

syncToRTC();
}
else {
t = time(0);
Expand All @@ -146,6 +155,39 @@ static int ntpc(struct in_addr addr)
}


void syncToRTC()
{
int fd = 0;
struct timeval tv;
struct tm localtm;
//struct rtc_time rtctm;
char s[64];

gettimeofday(&tv, NULL);
localtime_r(&tv.tv_sec, &localtm);

strftime(s, sizeof(s), "%a, %d %b %Y %H:%M:%S %z", &localtm);
printf("syncToRTC(): %s\n", s);

fd = open("/dev/rtc0", O_RDONLY);
if (fd == -1)
{
printf("ERROR: can't open /dev/rtc0 ...\n");
return;
}

int ret = ioctl(fd, RTC_SET_TIME, &localtm);
if(ret == -1)
{
close(fd);
printf("ERROR: can't set RTC...: %s\n", strerror(errno));
return;
}

close(fd);
return;
}

// -----------------------------------------------------------------------------


Expand Down