sysdeps/unix/sysv/linux/ntp_gettime.c

   1 /* Copyright (C) 1999-2023 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 /* clock_adjtime64 with CLOCK_REALTIME does not trigger EINVAL,
  30    ENODEV, or EOPNOTSUPP.  It might still trigger EPERM.  */
  31
  32 int
  33 __ntp_gettime64 (struct __ntptimeval64 *ntv)
  34 {
  35   struct __timex64 tntx;
  36   int result;
  37
  38   tntx.modes = 0;
  39   result = __clock_adjtime64 (CLOCK_REALTIME, &tntx);
  40   ntv->time = tntx.time;
  41   ntv->maxerror = tntx.maxerror;
  42   ntv->esterror = tntx.esterror;
  43   ntv->tai = tntx.tai;
  44   return result;
  45 }
  46
  47 #if __TIMESIZE != 64
  48 libc_hidden_def (__ntp_gettime64)
  49
  50 int
  51 __ntp_gettime (struct ntptimeval *ntv)
  52 {
  53   struct __ntptimeval64 ntv64;
  54   int result;
  55
  56   result = __ntp_gettime64 (&ntv64);
  57   *ntv = valid_ntptimeval64_to_ntptimeval (ntv64);
  58
  59   return result;
  60 }
  61 #endif
  62 strong_alias (__ntp_gettime, ntp_gettime)