2 * collectd - src/daemon/utils_time.h
3 * Copyright (C) 2010-2015 Florian octo Forster
5 * Permission is hereby granted, free of charge, to any person obtaining a
6 * copy of this software and associated documentation files (the "Software"),
7 * to deal in the Software without restriction, including without limitation
8 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
9 * and/or sell copies of the Software, and to permit persons to whom the
10 * Software is furnished to do so, subject to the following conditions:
12 * The above copyright notice and this permission notice shall be included in
13 * all copies or substantial portions of the Software.
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
18 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
21 * DEALINGS IN THE SOFTWARE.
24 * Florian octo Forster <octo at collectd.org>
28 #define UTILS_TIME_H 1
33 /* cdtime_mock is the time returned by cdtime() when build with
35 extern cdtime_t cdtime_mock;
39 * "cdtime_t" is a 64bit unsigned integer. The time is stored at a 2^-30 second
40 * resolution, i.e. the most significant 34 bit are used to store the time in
41 * seconds, the least significant bits store the sub-second part in something
42 * very close to nanoseconds. *The* big advantage of storing time in this
43 * manner is that comparing times and calculating differences is as simple as
44 * it is with "time_t", i.e. a simple integer comparison / subtraction works.
47 * cdtime_t is defined in "collectd.h" */
48 /* typedef uint64_t cdtime_t; */
50 /* 2^30 = 1073741824 */
51 #define TIME_T_TO_CDTIME_T(t) (((cdtime_t) (t)) << 30)
53 #define MS_TO_CDTIME_T(ms) (((((cdtime_t) (ms)) / 1000) << 30) | \
54 ((((((cdtime_t) (ms)) % 1000) << 30) + 500) / 1000))
55 #define US_TO_CDTIME_T(us) (((((cdtime_t) (us)) / 1000000) << 30) | \
56 ((((((cdtime_t) (us)) % 1000000) << 30) + 500000) / 1000000))
57 #define NS_TO_CDTIME_T(ns) (((((cdtime_t) (ns)) / 1000000000) << 30) | \
58 ((((((cdtime_t) (ns)) % 1000000000) << 30) + 500000000) / 1000000000))
60 #define CDTIME_T_TO_TIME_T(t) ((time_t) (((t) + (1 << 29)) >> 30))
61 #define CDTIME_T_TO_MS(t) ((uint64_t) ((((t) >> 30) * 1000) + \
62 ((((t) & 0x3fffffff) * 1000 + (1 << 29)) >> 30)))
63 #define CDTIME_T_TO_US(t) ((uint64_t) ((((t) >> 30) * 1000000) + \
64 ((((t) & 0x3fffffff) * 1000000 + (1 << 29)) >> 30)))
65 #define CDTIME_T_TO_NS(t) ((uint64_t) ((((t) >> 30) * 1000000000) + \
66 ((((t) & 0x3fffffff) * 1000000000 + (1 << 29)) >> 30)))
68 #define CDTIME_T_TO_DOUBLE(t) (((double) (t)) / 1073741824.0)
69 #define DOUBLE_TO_CDTIME_T(d) ((cdtime_t) ((d) * 1073741824.0))
71 #define CDTIME_T_TO_TIMEVAL(cdt,tvp) do { \
72 (tvp)->tv_sec = (time_t) ((cdt) >> 30); \
73 (tvp)->tv_usec = (suseconds_t) ((((cdt) & 0x3fffffff) * 1000000 + (1 << 29)) >> 30); \
75 #define TIMEVAL_TO_CDTIME_T(tv) US_TO_CDTIME_T(1000000 * (tv)->tv_sec + (tv)->tv_usec)
77 #define CDTIME_T_TO_TIMESPEC(cdt,tsp) do { \
78 (tsp)->tv_sec = (time_t) ((cdt) >> 30); \
79 (tsp)->tv_nsec = (long) ((((cdt) & 0x3fffffff) * 1000000000 + (1 << 29)) >> 30); \
81 #define TIMESPEC_TO_CDTIME_T(ts) NS_TO_CDTIME_T(1000000000ULL * (ts)->tv_sec + (ts)->tv_nsec)
83 cdtime_t cdtime (void);
85 #define RFC3339_SIZE 26
86 #define RFC3339NANO_SIZE 36
88 /* rfc3339 formats a cdtime_t time in RFC 3339 format with second precision. */
89 int rfc3339 (char *buffer, size_t buffer_size, cdtime_t t);
91 /* rfc3339nano formats a cdtime_t time in RFC 3339 format with nanosecond
93 int rfc3339nano (char *buffer, size_t buffer_size, cdtime_t t);
95 #endif /* UTILS_TIME_H */
96 /* vim: set sw=2 sts=2 et : */