rework langinfo code for ABI compat and for use by time code
[musl] / src / linux / adjtime.c
1 #define _GNU_SOURCE
2 #include <sys/time.h>
3 #include <sys/timex.h>
4 #include <errno.h>
5 #include "syscall.h"
6
7 int 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 (syscall(SYS_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 }