Support LTTNG_KERNEL_SESSION_SET_CREATION_NAME of lttng-modules
[lttng-tools.git] / src / common / time.c
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1/*
2 * Copyright (C) 2013 - Jérémie Galarneau <jeremie.galarneau@efficios.com>
3 *
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU General Public License, version 2 only, as
6 * published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
11 * more details.
12 *
13 * You should have received a copy of the GNU General Public License along with
14 * this program; if not, write to the Free Software Foundation, Inc., 51
15 * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
16 */
17
18#include <common/time.h>
d77fb8c7 19#include <common/error.h>
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20#include <common/macros.h>
21#include <stddef.h>
22#include <stdint.h>
23#include <limits.h>
24#include <errno.h>
25#include <pthread.h>
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26#include <locale.h>
27#include <string.h>
28
29static bool utf8_output_supported;
30
31LTTNG_HIDDEN
32bool locale_supports_utf8(void)
33{
34 return utf8_output_supported;
35}
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36
37LTTNG_HIDDEN
38int timespec_to_ms(struct timespec ts, unsigned long *ms)
39{
40 unsigned long res, remain_ms;
41
42 if (ts.tv_sec > ULONG_MAX / MSEC_PER_SEC) {
43 errno = EOVERFLOW;
44 return -1; /* multiplication overflow */
45 }
46 res = ts.tv_sec * MSEC_PER_SEC;
47 remain_ms = ULONG_MAX - res;
48 if (ts.tv_nsec / NSEC_PER_MSEC > remain_ms) {
49 errno = EOVERFLOW;
50 return -1; /* addition overflow */
51 }
52 res += ts.tv_nsec / NSEC_PER_MSEC;
53 *ms = res;
54 return 0;
55}
56
57LTTNG_HIDDEN
58struct timespec timespec_abs_diff(struct timespec t1, struct timespec t2)
59{
60 uint64_t ts1 = (uint64_t) t1.tv_sec * (uint64_t) NSEC_PER_SEC +
61 (uint64_t) t1.tv_nsec;
62 uint64_t ts2 = (uint64_t) t2.tv_sec * (uint64_t) NSEC_PER_SEC +
63 (uint64_t) t2.tv_nsec;
64 uint64_t diff = max(ts1, ts2) - min(ts1, ts2);
65 struct timespec res;
66
67 res.tv_sec = diff / (uint64_t) NSEC_PER_SEC;
68 res.tv_nsec = diff % (uint64_t) NSEC_PER_SEC;
69 return res;
70}
2a1135fa 71
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72LTTNG_HIDDEN
73int time_t_to_ISO8601(char *dest, size_t dest_size, time_t time)
74{
75 int ret;
76 struct tm tm, *timeinfo;
77
78 if (dest_size < ISO8601_LEN) {
79 ERR("Failed to format time to ISO8601 destination too small");
80 ret = -1;
81 goto end;
82 }
83
84 timeinfo = localtime_r(&time, &tm);
85 if (!timeinfo) {
86 PERROR("localtime");
87 ret = -1;
88 goto end;
89 }
90
91 ret = strftime(dest, dest_size, ISO8601_FORMAT, timeinfo);
92 if (ret == 0) {
93 ERR("Failed to format time to ISO8601");
94 ret = -1;
95 goto end;
96 }
97
98 ret = 0;
99end:
100 return ret;
101}
102
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103static
104void __attribute__((constructor)) init_locale_utf8_support(void)
105{
106 const char *program_locale = setlocale(LC_ALL, NULL);
107 const char *lang = getenv("LANG");
108
109 if (program_locale && strstr(program_locale, "utf8")) {
110 utf8_output_supported = true;
0731b11e 111 } else if (lang && strstr(lang, "utf8")) {
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112 utf8_output_supported = true;
113 }
114}
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