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/* clock_gettime -- Get current time from a POSIX clockid_t. Linux version.
Copyright (C) 2003-2018 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_GETTIME_VSYSCALL
# define HAVE_VSYSCALL
#endif
#include <sysdep-vdso.h>
#include <y2038-support.h>
# define DO_CLOCK_GETTIME_32 \
retval = INLINE_VSYSCALL (clock_gettime, 2, clock_id, &ts32); \
if (retval == 0) \
{ \
valid_timespec_to_timespec64 (&ts32, tp); \
}
#ifdef __NR_clock_gettime64
/* We are building with a 64-bit-time clock_gettime syscall */
# define DO_CLOCK_GETTIME_64 \
if (__y2038_linux_support > 0) \
{ \
retval = INLINE_SYSCALL (clock_gettime64, 2, clock_id, tp); \
if (retval == -1 && errno == ENOSYS) \
{ \
__y2038_linux_support = -1; \
DO_CLOCK_GETTIME_32; \
} \
} \
else \
{ \
DO_CLOCK_GETTIME_32; \
}
#else
/* We are building without a 64-bit-time clock_gettime syscall */
# define DO_CLOCK_GETTIME_64 DO_CLOCK_GETTIME_32
#endif
/* The REALTIME and MONOTONIC clock are definitely supported in the
kernel. */
#define SYSDEP_GETTIME \
SYSDEP_GETTIME_CPUTIME; \
case CLOCK_REALTIME: \
case CLOCK_MONOTONIC: \
DO_CLOCK_GETTIME_64; \
break
/* We handled the REALTIME clock here. */
#define HANDLED_REALTIME 1
#define HANDLED_CPUTIME 1
#define SYSDEP_GETTIME_CPU(clock_id, tp) \
DO_CLOCK_GETTIME_64; \
break
#define SYSDEP_GETTIME_CPUTIME \
struct timespec ts32
#include <sysdeps/unix/clock_gettime.c>
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