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/* clock_getres -- Get the resolution of a POSIX clockid_t. Linux version.
Copyright (C) 2003-2017 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
#include <sysdep.h>
#include <errno.h>
#include <time.h>
#include "kernel-posix-cpu-timers.h"
#ifdef HAVE_CLOCK_GETRES_VSYSCALL
# define HAVE_VSYSCALL
#endif
#include <sysdep-vdso.h>
#define SYSCALL_GETRES \
retval = INLINE_VSYSCALL (clock_getres, 2, clock_id, res); \
break
/* The REALTIME and MONOTONIC clock are definitely supported in the
kernel. */
#define SYSDEP_GETRES \
SYSDEP_GETRES_CPUTIME \
case CLOCK_REALTIME: \
case CLOCK_MONOTONIC: \
case CLOCK_MONOTONIC_RAW: \
case CLOCK_REALTIME_COARSE: \
case CLOCK_MONOTONIC_COARSE: \
SYSCALL_GETRES
/* We handled the REALTIME clock here. */
#define HANDLED_REALTIME 1
#define HANDLED_CPUTIME 1
#define SYSDEP_GETRES_CPU SYSCALL_GETRES
#define SYSDEP_GETRES_CPUTIME /* Default catches them too. */
/* The 64-bit version */
extern int __y2038_linux_support;
#define SYSCALL_GETRES64 \
if (__y2038_linux_support) \
{ \
retval = INLINE_VSYSCALL (clock_getres64, 2, clock_id, res); \
} \
else \
{ \
retval = INLINE_VSYSCALL (clock_getres, 2, clock_id, &ts32); \
if (retval==0) \
{ \
res->tv_sec = ts32.tv_sec; \
res->tv_nsec = ts32.tv_nsec; \
res->tv_pad = 0; \
} \
} \
break
/* The REALTIME and MONOTONIC clock are definitely supported in the
kernel. */
#define SYSDEP_GETRES64 \
SYSDEP_GETRES_CPUTIME64 \
case CLOCK_REALTIME: \
case CLOCK_MONOTONIC: \
case CLOCK_MONOTONIC_RAW: \
case CLOCK_REALTIME_COARSE: \
case CLOCK_MONOTONIC_COARSE: \
SYSCALL_GETRES64
/* We handled the REALTIME clock here. */
#define HANDLED_REALTIME64 1
#define HANDLED_CPUTIME64 1
#define SYSDEP_GETRES_CPU64 SYSCALL_GETRES64
#define SYSDEP_GETRES_CPUTIME64 \
struct timespec ts32;
#include <sysdeps/posix/clock_getres.c>
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