src/common/time.h

   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
  22 #include <time.h>
  23 #include <stdbool.h>
  24 #include <common/macros.h>
  25
  26 #define MSEC_PER_SEC    1000ULL
  27 #define NSEC_PER_SEC    1000000000ULL
  28 #define NSEC_PER_MSEC   1000000ULL
  29 #define NSEC_PER_USEC   1000ULL
  30 #define USEC_PER_SEC    1000000ULL
  31 #define USEC_PER_MSEC   1000ULL
  32
  33 #define SEC_PER_MINUTE  60ULL
  34 #define MINUTE_PER_HOUR 60ULL
  35
  36 #define USEC_PER_MINUTE (USEC_PER_SEC * SEC_PER_MINUTE)
  37 #define USEC_PER_HOURS  (USEC_PER_MINUTE * MINUTE_PER_HOUR)
  38
  39 #define ISO8601_STR_LEN sizeof("YYYYmmddTHHMMSS+HHMM")
  40
  41 LTTNG_HIDDEN
  42 bool locale_supports_utf8(void);
  43
  44 #define NSEC_UNIT       "ns"
  45 #define USEC_UNIT       (locale_supports_utf8() ? "µs" : "us")
  46 #define MSEC_UNIT       "ms"
  47 #define SEC_UNIT        "s"
  48 #define MIN_UNIT        "m"
  49 #define HR_UNIT         "h"
  50
  51 /*
  52  * timespec_to_ms: Convert timespec to milliseconds.
  53  *
  54  * Returns 0 on success, else -1 on error. errno is set to EOVERFLOW if
  55  * input would overflow the output in milliseconds.
  56  */
  57 LTTNG_HIDDEN
  58 int timespec_to_ms(struct timespec ts, unsigned long *ms);
  59
  60 /*
  61  * timespec_abs_diff: Absolute difference between timespec.
  62  */
  63 LTTNG_HIDDEN
  64 struct timespec timespec_abs_diff(struct timespec ts_a, struct timespec ts_b);
  65
  66 /*
  67  * Format a Unix timestamp to an ISO 8601 compatible timestamp of
  68  * the form "YYYYmmddTHHMMSS+HHMM" in local time. `len` must >= to
  69  * ISO8601_STR_LEN.
  70  *
  71  * Returns 0 on success, else -1 on error.
  72  */
  73 LTTNG_HIDDEN
  74 int time_to_iso8601_str(time_t time, char *str, size_t len);
  75
  76 #endif /* LTTNG_TIME_H */