Add a method to create a directory handle relative to another one
[lttng-tools.git] / src / common / time.c
CommitLineData
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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>
19#include <common/macros.h>
20#include <stddef.h>
21#include <stdint.h>
22#include <limits.h>
23#include <errno.h>
24#include <pthread.h>
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25#include <locale.h>
26#include <string.h>
27
28static bool utf8_output_supported;
29
30LTTNG_HIDDEN
31bool locale_supports_utf8(void)
32{
33 return utf8_output_supported;
34}
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35
36LTTNG_HIDDEN
37int timespec_to_ms(struct timespec ts, unsigned long *ms)
38{
39 unsigned long res, remain_ms;
40
41 if (ts.tv_sec > ULONG_MAX / MSEC_PER_SEC) {
42 errno = EOVERFLOW;
43 return -1; /* multiplication overflow */
44 }
45 res = ts.tv_sec * MSEC_PER_SEC;
46 remain_ms = ULONG_MAX - res;
47 if (ts.tv_nsec / NSEC_PER_MSEC > remain_ms) {
48 errno = EOVERFLOW;
49 return -1; /* addition overflow */
50 }
51 res += ts.tv_nsec / NSEC_PER_MSEC;
52 *ms = res;
53 return 0;
54}
55
56LTTNG_HIDDEN
57struct timespec timespec_abs_diff(struct timespec t1, struct timespec t2)
58{
59 uint64_t ts1 = (uint64_t) t1.tv_sec * (uint64_t) NSEC_PER_SEC +
60 (uint64_t) t1.tv_nsec;
61 uint64_t ts2 = (uint64_t) t2.tv_sec * (uint64_t) NSEC_PER_SEC +
62 (uint64_t) t2.tv_nsec;
63 uint64_t diff = max(ts1, ts2) - min(ts1, ts2);
64 struct timespec res;
65
66 res.tv_sec = diff / (uint64_t) NSEC_PER_SEC;
67 res.tv_nsec = diff % (uint64_t) NSEC_PER_SEC;
68 return res;
69}
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70
71static
72void __attribute__((constructor)) init_locale_utf8_support(void)
73{
74 const char *program_locale = setlocale(LC_ALL, NULL);
75 const char *lang = getenv("LANG");
76
77 if (program_locale && strstr(program_locale, "utf8")) {
78 utf8_output_supported = true;
0731b11e 79 } else if (lang && strstr(lang, "utf8")) {
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80 utf8_output_supported = true;
81 }
82}
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