lib: monotime.h tabs -> spaces

[mirror_frr.git] / lib / monotime.h

/*
 * Copyright (c) 2017  David Lamparter, for NetDEF, Inc.
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#ifndef _FRR_MONOTIME_H
#define _FRR_MONOTIME_H

#include <stdint.h>
#include <time.h>
#include <sys/time.h>

#ifndef TIMESPEC_TO_TIMEVAL
/* should be in sys/time.h on BSD & Linux libcs */
#define TIMESPEC_TO_TIMEVAL(tv, ts) do {        \
        (tv)->tv_sec = (ts)->tv_sec;            \
        (tv)->tv_usec = (ts)->tv_nsec / 1000;   \
        } while (0)
#endif
#ifndef TIMEVAL_TO_TIMESPEC
/* should be in sys/time.h on BSD & Linux libcs */
#define TIMEVAL_TO_TIMESPEC(tv, ts) do {        \
        (ts)->tv_sec = (tv)->tv_sec;            \
        (ts)->tv_nsec = (tv)->tv_usec * 1000;   \
        } while (0)
#endif

static inline time_t monotime(struct timeval *tvo)
{
        struct timespec ts;

        clock_gettime(CLOCK_MONOTONIC, &ts);
        if (tvo) {
                TIMESPEC_TO_TIMEVAL(tvo, &ts);
        }
        return ts.tv_sec;
}

/* the following two return microseconds, not time_t!
 *
 * also, they're negative forms of each other, but having both makes the
 * code more readable
 */
static inline int64_t monotime_since(const struct timeval *ref,
                                     struct timeval *out)
{
        struct timeval tv;
        monotime(&tv);
        timersub(&tv, ref, &tv);
        if (out)
                *out = tv;
        return (int64_t)tv.tv_sec * 1000000LL + tv.tv_usec;
}

static inline int64_t monotime_until(const struct timeval *ref,
                                     struct timeval *out)
{
        struct timeval tv;
        monotime(&tv);
        timersub(ref, &tv, &tv);
        if (out)
                *out = tv;
        return (int64_t)tv.tv_sec * 1000000LL + tv.tv_usec;
}

#endif /* _FRR_MONOTIME_H */