Fix: time constants already defined on macOS
[lttng-tools.git] / src / common / time.h
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1/*
2 * Copyright (C) 2016 - Jérémie Galarneau <jeremie.galarneau@efficios.com>
3 *
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2.1 of the License, or (at your option) any later version.
8 *
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
13 *
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with this library; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17 */
18
19#ifndef LTTNG_TIME_H
20#define LTTNG_TIME_H
21
2daf6502 22#include <time.h>
2a1135fa 23#include <stdbool.h>
03ab1b42 24#include <common/macros.h>
efef32e9 25#include <common/compat/time.h>
2daf6502 26
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27#define MSEC_PER_SEC 1000ULL
28#define NSEC_PER_SEC 1000000000ULL
29#define NSEC_PER_MSEC 1000000ULL
30#define NSEC_PER_USEC 1000ULL
31#define USEC_PER_SEC 1000000ULL
32#define USEC_PER_MSEC 1000ULL
33
34#define SEC_PER_MINUTE 60ULL
35#define MINUTE_PER_HOUR 60ULL
36
37#define USEC_PER_MINUTE (USEC_PER_SEC * SEC_PER_MINUTE)
38#define USEC_PER_HOURS (USEC_PER_MINUTE * MINUTE_PER_HOUR)
395d6b02 39
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40#define ISO8601_STR_LEN sizeof("YYYYmmddTHHMMSS+HHMM")
41
03ab1b42 42LTTNG_HIDDEN
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43bool locale_supports_utf8(void);
44
45#define NSEC_UNIT "ns"
46#define USEC_UNIT (locale_supports_utf8() ? "µs" : "us")
47#define MSEC_UNIT "ms"
48#define SEC_UNIT "s"
49#define MIN_UNIT "m"
50#define HR_UNIT "h"
51
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52/*
53 * timespec_to_ms: Convert timespec to milliseconds.
54 *
55 * Returns 0 on success, else -1 on error. errno is set to EOVERFLOW if
56 * input would overflow the output in milliseconds.
57 */
03ab1b42 58LTTNG_HIDDEN
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59int timespec_to_ms(struct timespec ts, unsigned long *ms);
60
61/*
62 * timespec_abs_diff: Absolute difference between timespec.
63 */
03ab1b42 64LTTNG_HIDDEN
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65struct timespec timespec_abs_diff(struct timespec ts_a, struct timespec ts_b);
66
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67/*
68 * Format a Unix timestamp to an ISO 8601 compatible timestamp of
69 * the form "YYYYmmddTHHMMSS+HHMM" in local time. `len` must >= to
70 * ISO8601_STR_LEN.
71 *
72 * Returns 0 on success, else -1 on error.
73 */
74LTTNG_HIDDEN
75int time_to_iso8601_str(time_t time, char *str, size_t len);
76
395d6b02 77#endif /* LTTNG_TIME_H */
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