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/*
Copyright (C) 2010-2011 EPFL (Ecole Polytechnique Fédérale de Lausanne)
Laboratory CNBI (Chair in Non-Invasive Brain-Machine Interface)
Nicolas Bourdaud <nicolas.bourdaud@epfl.ch>
This program 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 3 of the License, or
(at your option) any later version.
This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
*/
#if HAVE_CONFIG_H
# include <config.h>
#endif
#include <time.h>
#include <errno.h>
#include "portable-time.h"
#ifdef HAVE_GETTIMEOFDAY
# include <sys/time.h>
static void gettimespec(struct timespec* tp)
{
struct timeval tv;
gettimeofday(&tv, NULL);
tp->tv_sec = tv.tv_sec;
tp->tv_nsec = tv.tv_usec*1000;
}
#elif defined(HAVE_GETSYSTEMTIMEASFILETIME) /* !HAVE_GETTIMEOFDAY */
# include <windows.h>
/* timespec time are expressed since Epoch i.e. since January, 1, 1970
whereas windows FILETIME since January 1, 1601 (UTC)*/
#define FT_EPOCH (((LONGLONG)27111902 << 32) + (LONGLONG)3577643008)
static void convert_filetime_to_timespec(const FILETIME* ft,
struct timespec* ts, int reltime)
{
ULARGE_INTEGER bigint;
bigint.LowPart = ft->dwLowDateTime;
bigint.HighPart = ft->dwHighDateTime;
if (reltime)
bigint.QuadPart *= -1;
else
bigint.QuadPart -= FT_EPOCH;
ts->tv_sec = bigint.QuadPart / 10000000;
ts->tv_nsec = (bigint.QuadPart % 10000000)*100;
}
static void gettimespec(struct timespec* tp)
{
FILETIME curr;
GetSystemTimeAsFileTime(&curr);
convert_filetime_to_timespec(&curr, tp, 0);
}
#elif defined(HAVE__FTIME) || defined(HAVE_FTIME) /* !HAVE_GETSYSTEMTIMEASFILETIME */
# include <sys/timeb.h>
# ifndef HAVE_FTIME
# define ftime _ftime
# define timeb _timeb
# endif
static void gettimespec(struct timespec* tp)
{
struct timeb now;
ftime(&now);
tp->tv_sec = now.time;
tp->tv_nsec = now.millitm*1000000;
}
#else /* !HAVE_FTIME */
# error There is no replacement for clock_gettime
#endif
int clock_gettime(clockid_t clk_id, struct timespec *tp)
{
(void)clk_id;
if (!tp) {
errno = EFAULT;
return -1;
}
gettimespec(tp);
return 0;
}
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