sysdeps/unix/sysv/linux/timespec_getres.c

   1 /* Get resolution of a time base.
   2    Copyright (C) 2021-2024 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.
   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    <https://www.gnu.org/licenses/>.  */
  18
  19 #include <time.h>
  20
  21 /* Set TS to resolution of time base BASE.  */
  22 int
  23 __timespec_getres64 (struct __timespec64 *ts, int base)
  24 {
  25   if (base == TIME_UTC)
  26     {
  27       __clock_getres64 (CLOCK_REALTIME, ts);
  28       return base;
  29     }
  30   return 0;
  31 }
  32
  33 #if __TIMESIZE != 64
  34 libc_hidden_def (__timespec_getres64)
  35
  36 int
  37 __timespec_getres (struct timespec *ts, int base)
  38 {
  39   int ret;
  40   struct __timespec64 tp64;
  41
  42   ret = __timespec_getres64 (&tp64, base);
  43
  44   if (ret == TIME_UTC && ts != NULL)
  45     *ts = valid_timespec64_to_timespec (tp64);
  46
  47   return ret;
  48 }
  49 #endif
  50 strong_alias (__timespec_getres, timespec_getres);