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/* systemtime.c -- Portable system time source
This file is part of Redshift.
Redshift is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
Redshift 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with Redshift. If not, see <http://www.gnu.org/licenses/>.
Copyright (c) 2010-2014 Jon Lund Steffensen <jonlst@gmail.com>
*/
#include <stdio.h>
#include <unistd.h>
#ifndef _WIN32
# if _POSIX_TIMERS > 0
# include <time.h>
# else
# include <sys/time.h>
# endif
#else
# include <windows.h>
#endif
#include "systemtime.h"
/* Return current time in T as the number of seconds since the epoch. */
int
systemtime_get_time(double *t)
{
#if defined(_WIN32) /* Windows */
FILETIME now;
ULARGE_INTEGER i;
GetSystemTimeAsFileTime(&now);
i.LowPart = now.dwLowDateTime;
i.HighPart = now.dwHighDateTime;
/* FILETIME is tenths of microseconds since 1601-01-01 UTC */
*t = (i.QuadPart / 10000000.0) - 11644473600.0;
#elif _POSIX_TIMERS > 0 /* POSIX timers */
struct timespec now;
int r = clock_gettime(CLOCK_REALTIME, &now);
if (r < 0) {
perror("clock_gettime");
return -1;
}
*t = now.tv_sec + (now.tv_nsec / 1000000000.0);
#else /* other platforms */
struct timeval now;
int r = gettimeofday(&now, NULL);
if (r < 0) {
perror("gettimeofday");
return -1;
}
*t = now.tv_sec + (now.tv_usec / 1000000.0);
#endif
return 0;
}
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