timespec_get.c 2.31 KB
Newer Older
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
/*****************************************************************************
 * timespec_get.c: C11 timespec_get() replacement
 *****************************************************************************
 * Copyright © 2015 Rémi Denis-Courmont
 *
 * 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 2.1 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, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
 *****************************************************************************/

#ifdef HAVE_CONFIG_H
# include <config.h>
#endif

25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46
#ifdef _WIN32
#include <windows.h>

int timespec_get(struct timespec *ts, int base)
{
    FILETIME ft;
    ULARGE_INTEGER s;
    ULONGLONG t;

    if (base != TIME_UTC)
        return 0;

    GetSystemTimeAsFileTime(&ft);
    s.LowPart = ft.dwLowDateTime;
    s.HighPart = ft.dwHighDateTime;
    t = s.QuadPart - 116444736000000000ULL;
    ts->tv_sec = t / 10000000;
    ts->tv_nsec = ((int) (t % 10000000)) * 100;
    return base;
}
#else /* !_WIN32 */

47 48 49 50 51
#include <time.h>
#include <unistd.h> /* _POSIX_TIMERS */
#ifndef _POSIX_TIMERS
#define _POSIX_TIMERS (-1)
#endif
52 53 54
#if (_POSIX_TIMERS <= 0)
# include <sys/time.h> /* gettimeofday() */
#endif
55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82

int timespec_get(struct timespec *ts, int base)
{
    switch (base)
    {
        case TIME_UTC:
#if (_POSIX_TIMERS >= 0)
            if (clock_gettime(CLOCK_REALTIME, ts) == 0)
                break;
#endif
#if (_POSIX_TIMERS <= 0)
        {
            struct timeval tv;

            if (gettimeofday(&tv, NULL) == 0)
            {
                ts->tv_sec = tv.tv_sec;
                ts->tv_nsec = tv.tv_usec * 1000;
                break;
            }
        }
#endif
            /* fall through */
        default:
            return 0;
    }
    return base;
}
83
#endif /* !_WIN32 */