sysdeps/unix/sysv/linux/ntp_gettime.c

   1 /* Copyright (C) 1999-2024 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 #define ntp_gettime ntp_gettime_redirect
  19
  20 #include <time.h>
  21 #include <sys/timex.h>
  22
  23 #undef ntp_gettime
  24
  25 #ifndef MOD_OFFSET
  26 # define modes mode
  27 #endif
  28
  29 /* glibc 2.12 added the 'tai' field to follow along the kernel, but it did
  30    not add a compatibility symbol, instead it added __ntp_gettimex.  However
  31    ntptimeval was still used in both cases, so to keep compatibility it
  32    can not set all the new field.  */
  33
  34 /* clock_adjtime64 with CLOCK_REALTIME does not trigger EINVAL,
  35    ENODEV, or EOPNOTSUPP.  It might still trigger EPERM.  */
  36
  37 int
  38 __ntp_gettime64 (struct __ntptimeval64 *ntv)
  39 {
  40   struct __timex64 tntx;
  41   int result;
  42
  43   tntx.modes = 0;
  44   result = __clock_adjtime64 (CLOCK_REALTIME, &tntx);
  45   ntv->time = tntx.time;
  46   ntv->maxerror = tntx.maxerror;
  47   ntv->esterror = tntx.esterror;
  48
  49   return result;
  50 }
  51
  52 #if __TIMESIZE != 64
  53 libc_hidden_def (__ntp_gettime64)
  54
  55 int
  56 __ntp_gettime (struct ntptimeval *ntv)
  57 {
  58   struct __ntptimeval64 ntv64;
  59   int result;
  60
  61   result = __ntp_gettime64 (&ntv64);
  62   ntv->time = valid_timeval64_to_timeval (ntv64.time);
  63   ntv->maxerror = ntv64.maxerror;
  64   ntv->esterror = ntv64.esterror;
  65
  66   return result;
  67 }
  68 #endif
  69 strong_alias (__ntp_gettime, ntp_gettime)