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tvsettime.c

/***********************************************************************
*                                                                      *
*               This software is part of the ast package               *
*                  Copyright (c) 1985-2006 AT&T Corp.                  *
*                      and is licensed under the                       *
*                  Common Public License, Version 1.0                  *
*                            by AT&T Corp.                             *
*                                                                      *
*                A copy of the License is available at                 *
*            http://www.opensource.org/licenses/cpl1.0.txt             *
*         (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9)         *
*                                                                      *
*              Information and Software Systems Research               *
*                            AT&T Research                             *
*                           Florham Park NJ                            *
*                                                                      *
*                 Glenn Fowler <gsf@research.att.com>                  *
*                  David Korn <dgk@research.att.com>                   *
*                   Phong Vo <kpv@research.att.com>                    *
*                                                                      *
***********************************************************************/
#pragma prototyped

#include <tv.h>
#include <tm.h>
#include <errno.h>

#include "FEATURE/tvlib"

int
tvsettime(const Tv_t* tv)
{

#if _lib_clock_settime && defined(CLOCK_REALTIME)

      struct timespec               s;

      s.tv_sec = tv->tv_sec;
      s.tv_nsec = tv->tv_nsec;
      return clock_settime(CLOCK_REALTIME, &s);

#else

#if defined(tmsettimeofday)

      struct timeval                v;

      v.tv_sec = tv->tv_sec;
      v.tv_usec = tv->tv_nsec / 1000;
      return tmsettimeofday(&v);

#else

#if _lib_stime

      static time_t                 s;

      s = tv->tv_sec + (tv->tv_nsec != 0);
      return stime(s);

#else

      errno = EPERM;
      return -1;

#endif

#endif

#endif

}

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