sysdeps/unix/sysv/linux/timespec_get.c

   1 /* Copyright (C) 2011-2014 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.
   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    <http://www.gnu.org/licenses/>.  */
  17
  18 #include <time.h>
  19 #include <sysdep.h>
  20 #include <kernel-features.h>
  21
  22 #ifndef HAVE_CLOCK_GETTIME_VSYSCALL
  23 # undef INTERNAL_VSYSCALL
  24 # define INTERNAL_VSYSCALL INTERNAL_SYSCALL
  25 #else
  26 # include <bits/libc-vdso.h>
  27 #endif
  28
  29 #ifndef INTERNAL_GETTIME
  30 # define INTERNAL_GETTIME(id, tp) \
  31   INTERNAL_VSYSCALL (clock_gettime, err, 2, id, tp)
  32 #endif
  33
  34
  35 /* Set TS to calendar time based in time base BASE.  */
  36 int
  37 timespec_get (ts, base)
  38      struct timespec *ts;
  39      int base;
  40 {
  41   switch (base)
  42     {
  43       int res;
  44       INTERNAL_SYSCALL_DECL (err);
  45     case TIME_UTC:
  46       res = INTERNAL_GETTIME (CLOCK_REALTIME, ts);
  47       if (INTERNAL_SYSCALL_ERROR_P (res, err))
  48         return 0;
  49       break;
  50
  51     default:
  52       return 0;
  53     }
  54
  55   return base;
  56 }