src/common/time.hpp

   1 /*
   2  * Copyright (C) 2016 Jérémie Galarneau <jeremie.galarneau@efficios.com>
   3  *
   4  * SPDX-License-Identifier: LGPL-2.1-or-later
   5  *
   6  */
   7
   8 #ifndef LTTNG_TIME_H
   9 #define LTTNG_TIME_H
  10
  11 #include <time.h>
  12 #include <stdbool.h>
  13 #include <common/macros.hpp>
  14 #include <common/compat/time.hpp>
  15
  16 #define MSEC_PER_SEC    1000ULL
  17 #define NSEC_PER_SEC    1000000000ULL
  18 #define NSEC_PER_MSEC   1000000ULL
  19 #define NSEC_PER_USEC   1000ULL
  20 #define USEC_PER_SEC    1000000ULL
  21 #define USEC_PER_MSEC   1000ULL
  22
  23 #define SEC_PER_MINUTE  60ULL
  24 #define MINUTE_PER_HOUR 60ULL
  25
  26 #define USEC_PER_MINUTE (USEC_PER_SEC * SEC_PER_MINUTE)
  27 #define USEC_PER_HOURS  (USEC_PER_MINUTE * MINUTE_PER_HOUR)
  28
  29 #define ISO8601_STR_LEN sizeof("YYYYmmddTHHMMSS+HHMM")
  30 #define DATETIME_STR_LEN sizeof("YYYYmmdd-HHMMSS")
  31
  32 bool locale_supports_utf8(void);
  33
  34 #define NSEC_UNIT       "ns"
  35 #define USEC_UNIT       (locale_supports_utf8() ? "µs" : "us")
  36 #define MSEC_UNIT       "ms"
  37 #define SEC_UNIT        "s"
  38 #define MIN_UNIT        "m"
  39 #define HR_UNIT         "h"
  40
  41 /*
  42  * timespec_to_ms: Convert timespec to milliseconds.
  43  *
  44  * Returns 0 on success, else -1 on error. errno is set to EOVERFLOW if
  45  * input would overflow the output in milliseconds.
  46  */
  47 int timespec_to_ms(struct timespec ts, unsigned long *ms);
  48
  49 /*
  50  * timespec_abs_diff: Absolute difference between timespec.
  51  */
  52 struct timespec timespec_abs_diff(struct timespec ts_a, struct timespec ts_b);
  53
  54 /*
  55  * Format a Unix timestamp to an ISO 8601 compatible timestamp of
  56  * the form "YYYYmmddTHHMMSS+HHMM" in local time. `len` must >= to
  57  * ISO8601_STR_LEN.
  58  *
  59  * Returns 0 on success, else -1 on error.
  60  */
  61 int time_to_iso8601_str(time_t time, char *str, size_t len);
  62
  63 int time_to_datetime_str(time_t time, char *str, size_t len);
  64
  65 #endif /* LTTNG_TIME_H */