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, see
  16    <http://www.gnu.org/licenses/>.  */
  17
  18 #include <errno.h>
  19 #include <time.h>
  20 #include <sys/time.h>
  21
  22 /* Set the current time of day and timezone information.
  23    This call is restricted to the super-user.  */
  24 int
  25 __settimeofday (tv, tz)
  26      const struct timeval *tv;
  27      const struct timezone *tz;
  28 {
  29   time_t when;
  30
  31   if (tv == NULL)
  32     {
  33       __set_errno (EINVAL);
  34       return -1;
  35     }
  36
  37   if (tz != NULL || tv->tv_usec % 1000000 != 0)
  38     {
  39       __set_errno (ENOSYS);
  40       return -1;
  41     }
  42
  43   when = tv->tv_sec + (tv->tv_usec / 1000000);
  44   return stime (&when);
  45 }
  46
  47 weak_alias (__settimeofday, settimeofday)