lib/settime.c

   1 /* settime -- set the system clock
   2    Copyright (C) 2002 Free Software Foundation, Inc.
   3
   4    This program is free software; you can redistribute it and/or modify
   5    it under the terms of the GNU General Public License as published by
   6    the Free Software Foundation; either version 2, or (at your option)
   7    any later version.
   8
   9    This program is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12    GNU General Public License for more details.
  13
  14    You should have received a copy of the GNU General Public License
  15    along with this program; if not, write to the Free Software Foundation,
  16    Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  17
  18 /* Written by Paul Eggert.  */
  19
  20 #ifdef HAVE_CONFIG_H
  21 # include <config.h>
  22 #endif
  23
  24 #include "timespec.h"
  25
  26 /* Set the system time.  */
  27
  28 int
  29 settime (struct timespec const *ts)
  30 {
  31 #if defined CLOCK_REALTIME && HAVE_CLOCK_SETTIME
  32   if (clock_settime (CLOCK_REALTIME, ts) == 0)
  33     return 0;
  34 #endif
  35
  36   {
  37     struct timeval tv;
  38
  39     tv.tv_sec = ts->tv_sec;
  40     tv.tv_usec = ts->tv_nsec / 1000;
  41     return settimeofday (&tv, 0);
  42   }
  43 }