time/settimeofday.c

   1 /* Copyright (C) 1991-2024 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    <https://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 (const struct timeval *tv, const struct timezone *tz)
  26 {
  27   if (__glibc_unlikely (tz != 0))
  28     {
  29       if (tv != 0)
  30         {
  31           __set_errno (EINVAL);
  32           return -1;
  33         }
  34       return __settimezone (tz);
  35     }
  36
  37   struct timespec ts;
  38   TIMEVAL_TO_TIMESPEC (tv, &ts);
  39   return __clock_settime (CLOCK_REALTIME, &ts);
  40 }
  41
  42 #ifdef VERSION_settimeofday
  43 weak_alias (__settimeofday, __settimeofday_w);
  44 default_symbol_version (__settimeofday_w, settimeofday, VERSION_settimeofday);
  45 #else
  46 weak_alias (__settimeofday, settimeofday);
  47 #endif