1#define _GNU_SOURCE
2#include <sys/time.h>
3#include <sys/timex.h>
4#include <errno.h>
5#include "syscall.h"
6
7int adjtime(const struct timeval *in, struct timeval *out)
8{
9 struct timex tx = { 0 };
10 if (in) {
11 if (in->tv_sec > 1000 || in->tv_usec > 1000000000) {
12 errno = EINVAL;
13 return -1;
14 }
15 tx.offset = in->tv_sec*1000000 + in->tv_usec;
16 tx.modes = ADJ_OFFSET_SINGLESHOT;
17 }
18 if (adjtimex(&tx) < 0) return -1;
19 if (out) {
20 out->tv_sec = tx.offset / 1000000;
21 if ((out->tv_usec = tx.offset % 1000000) < 0) {
22 out->tv_sec--;
23 out->tv_usec += 1000000;
24 }
25 }
26 return 0;
27}