sysdeps/unix/sysv/linux/clock_getres.c

   1 /* clock_getres -- Get the resolution of a POSIX clockid_t.  Linux version.
   2    Copyright (C) 2003-2016 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, 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; if not, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #include <sysdep.h>
  20 #include <errno.h>
  21 #include <time.h>
  22 #include "kernel-posix-cpu-timers.h"
  23
  24 #ifdef HAVE_CLOCK_GETRES_VSYSCALL
  25 # define HAVE_VSYSCALL
  26 #endif
  27 #include <sysdep-vdso.h>
  28
  29 #define SYSCALL_GETRES \
  30   retval = INLINE_VSYSCALL (clock_getres, 2, clock_id, res); \
  31   break
  32
  33 /* The REALTIME and MONOTONIC clock are definitely supported in the
  34    kernel.  */
  35 #define SYSDEP_GETRES                                                         \
  36   SYSDEP_GETRES_CPUTIME                                                       \
  37   case CLOCK_REALTIME:                                                        \
  38   case CLOCK_MONOTONIC:                                                       \
  39   case CLOCK_MONOTONIC_RAW:                                                   \
  40   case CLOCK_REALTIME_COARSE:                                                 \
  41   case CLOCK_MONOTONIC_COARSE:                                                \
  42     SYSCALL_GETRES
  43
  44 /* We handled the REALTIME clock here.  */
  45 #define HANDLED_REALTIME        1
  46 #define HANDLED_CPUTIME         1
  47
  48 #define SYSDEP_GETRES_CPU SYSCALL_GETRES
  49 #define SYSDEP_GETRES_CPUTIME   /* Default catches them too.  */
  50
  51 #include <sysdeps/posix/clock_getres.c>