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#include <limits.h>

#include <sys/time.h>

#include <sys/timex.h>

#include <errno.h>

#define MAX_SEC (LONG_MAX / 1000000L - 2)

#define MIN_SEC (LONG_MIN / 1000000L + 2)

#ifndef MOD_OFFSET

#define modes mode

#endif

int

adjtime(const struct timeval * itv, struct timeval * otv)

{

  struct timex tntx;

  if (itv)

  {

    struct timeval tmp;

    /* We will do some check here. */

    tmp.tv_sec = itv->tv_sec + itv->tv_usec / 1000000L;

    tmp.tv_usec = itv->tv_usec % 1000000L;

    if (tmp.tv_sec > MAX_SEC || tmp.tv_sec < MIN_SEC)

    {

        __set_errno(EINVAL);

        return -1;

    }

    tntx.offset = tmp.tv_usec + tmp.tv_sec * 1000000L;

    tntx.modes = ADJ_OFFSET_SINGLESHOT;

  }

  else

  {

    tntx.modes = 0;

  }

  if (adjtimex(&tntx) < 0) return -1;

  if (otv) {

    if (tntx.offset < 0)

      {

        otv->tv_usec = -(-tntx.offset % 1000000);

        otv->tv_sec  = -(-tntx.offset / 1000000);

      }

    else

      {

        otv->tv_usec = tntx.offset % 1000000;

        otv->tv_sec  = tntx.offset / 1000000;

      }

  }

  return 0;

}