sysdeps/unix/sysv/settimeofday.c

   1 /* Copyright (C) 1992, 1995, 1996, 1997, 2001 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library 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 GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, write to the Free
  16    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  17    02111-1307 USA.  */
  18
  19 #include <errno.h>
  20 #include <time.h>
  21 #include <sys/time.h>
  22
  23 /* Set the current time of day and timezone information.
  24    This call is restricted to the super-user.  */
  25 int
  26 __settimeofday (tv, tz)
  27      const struct timeval *tv;
  28      const struct timezone *tz;
  29 {
  30   time_t when;
  31
  32   if (tv == NULL)
  33     {
  34       __set_errno (EINVAL);
  35       return -1;
  36     }
  37
  38   if (tz != NULL || tv->tv_usec % 1000000 != 0)
  39     {
  40       __set_errno (ENOSYS);
  41       return -1;
  42     }
  43
  44   when = tv->tv_sec + (tv->tv_usec / 1000000);
  45   return stime (&when);
  46 }
  47
  48 weak_alias (__settimeofday, settimeofday)