sysdeps/unix/sysv/linux/clock_adjtime.c

   1 /* clock_adjtime -- tune kernel clock.
   2    Copyright (C) 2020-2021 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 License as
   7    published by the Free Software Foundation; either version 2.1 of the
   8    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; see the file COPYING.LIB.  If
  17    not, see <https://www.gnu.org/licenses/>.  */
  18
  19 #include <errno.h>
  20 #include <stdlib.h>
  21 #include <time.h>
  22 #include <sysdep.h>
  23 #include <sys/timex.h>
  24 #include <kernel-features.h>
  25
  26 int
  27 __clock_adjtime64 (const clockid_t clock_id, struct __timex64 *tx64)
  28 {
  29 #ifndef __NR_clock_adjtime64
  30 # define __NR_clock_adjtime64 __NR_clock_adjtime
  31 #endif
  32   int r = INLINE_SYSCALL_CALL (clock_adjtime64, clock_id, tx64);
  33 #ifndef __ASSUME_TIME64_SYSCALLS
  34   if (r >= 0 || errno != ENOSYS)
  35     return r;
  36
  37   if (tx64->modes & ADJ_SETOFFSET
  38       && ! in_time_t_range (tx64->time.tv_sec))
  39     {
  40       __set_errno (EOVERFLOW);
  41       return -1;
  42     }
  43
  44   struct timex tx32 = valid_timex64_to_timex (*tx64);
  45   r = INLINE_SYSCALL_CALL (clock_adjtime, clock_id, &tx32);
  46   if (r >= 0)
  47     *tx64 = valid_timex_to_timex64 (tx32);
  48 #endif
  49   return r;
  50 }
  51
  52 #if __TIMESIZE != 64
  53 libc_hidden_def (__clock_adjtime64)
  54
  55 int
  56 __clock_adjtime (const clockid_t clock_id, struct timex *tx)
  57 {
  58   struct __timex64 tx64;
  59   int retval;
  60
  61   tx64 = valid_timex_to_timex64 (*tx);
  62   retval = __clock_adjtime64 (clock_id, &tx64);
  63   if (retval >= 0)
  64     *tx = valid_timex64_to_timex (tx64);
  65
  66   return retval;
  67 }
  68 #endif
  69 libc_hidden_def (__clock_adjtime);
  70 strong_alias (__clock_adjtime, clock_adjtime)