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/* clock_gettime -- Get current time from a POSIX clockid_t. Linux version.
Copyright (C) 2003, 2004 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 <errno.h>
#include <sysdep.h>
#include <time.h>
#include <sys/time.h>
#include "kernel-posix-cpu-timers.h"
#define SYSCALL_GETTIME \
retval = INLINE_SYSCALL (clock_gettime, 2, clock_id, tp); \
break
/* The REALTIME and MONOTONIC clock are definitely supported in the kernel. */
#define SYSDEP_GETTIME \
SYSDEP_GETTIME_CPUTIME \
case CLOCK_REALTIME: \
case CLOCK_MONOTONIC: \
SYSCALL_GETTIME
/* We handled the REALTIME clock here. */
#define HANDLED_REALTIME 1
#define HANDLED_CPUTIME 1
#define SYSDEP_GETTIME_CPU SYSCALL_GETTIME
#define SYSDEP_GETTIME_CPUTIME /* Default catches them too. */
static inline int
realtime_gettime (struct timespec *tp)
{
struct timeval tv;
int retval = gettimeofday (&tv, NULL);
if (retval == 0)
/* Convert into `timespec'. */
TIMEVAL_TO_TIMESPEC (&tv, tp);
return retval;
}
/* Get current value of CLOCK and store it in TP. */
int
clock_gettime (clockid_t clock_id, struct timespec *tp)
{
int retval = -1;
#ifndef HANDLED_REALTIME
struct timeval tv;
#endif
switch (clock_id)
{
#ifdef SYSDEP_GETTIME
SYSDEP_GETTIME;
#endif
#ifndef HANDLED_REALTIME
case CLOCK_REALTIME:
retval = gettimeofday (&tv, NULL);
if (retval == 0)
TIMEVAL_TO_TIMESPEC (&tv, tp);
break;
#endif
default:
#ifdef SYSDEP_GETTIME_CPU
SYSDEP_GETTIME_CPU;
#endif
__set_errno (EINVAL);
break;
}
return retval;
}
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