1/* clock_getres -- Get the resolution of a POSIX clockid_t. Linux version.
2 Copyright (C) 2003-2019 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>
52