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28 lines
596 B
C
28 lines
596 B
C
#define _GNU_SOURCE
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#include <sys/time.h>
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#include <sys/timex.h>
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#include <errno.h>
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#include "syscall.h"
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int adjtime(const struct timeval *in, struct timeval *out)
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{
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struct timex tx = { 0 };
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if (in) {
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if (in->tv_sec > 1000 || in->tv_usec > 1000000000) {
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errno = EINVAL;
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return -1;
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}
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tx.offset = in->tv_sec*1000000 + in->tv_usec;
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tx.modes = ADJ_OFFSET_SINGLESHOT;
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}
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if (syscall(SYS_adjtimex, &tx) < 0) return -1;
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if (out) {
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out->tv_sec = tx.offset / 1000000;
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if ((out->tv_usec = tx.offset % 1000000) < 0) {
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out->tv_sec--;
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out->tv_usec += 1000000;
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}
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}
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return 0;
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}
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