1  /* Obsolete set system time.  Linux version.
       2     Copyright (C) 2019-2023 Free Software Foundation, Inc.
       3     This file is part of the GNU C Library.
       4  
       5     The GNU C Library is free software; you can redistribute it and/or
       6     modify it under the terms of the GNU Lesser General Public
       7     License as published by the Free Software Foundation; either
       8     version 2.1 of the License, or (at your option) any later version.
       9  
      10     The GNU C Library is distributed in the hope that it will be useful,
      11     but WITHOUT ANY WARRANTY; without even the implied warranty of
      12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      13     Lesser General Public License for more details.
      14  
      15     You should have received a copy of the GNU Lesser General Public
      16     License along with the GNU C Library; if not, see
      17     <http://www.gnu.org/licenses/>.  */
      18  
      19  #include <errno.h>
      20  #include <sys/time.h>
      21  #include <stddef.h>
      22  #include <sysdep.h>
      23  
      24  /* Set the system-wide timezone.
      25     This call is restricted to the super-user.
      26     This operation is considered obsolete, kernel support may not be
      27     available on all architectures.  */
      28  int
      29  __settimezone (const struct timezone *tz)
      30  {
      31  #ifdef __NR_settimeofday
      32    return INLINE_SYSCALL_CALL (settimeofday, NULL, tz);
      33  #else
      34    __set_errno (ENOSYS);
      35    return -1;
      36  #endif
      37  }