Fix: sessiond: ust: deadlock with per-pid buffers
[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>
8de88061 19#include <common/error.h>
507f5694 20#include <common/macros.h>
274ca939 21#include <common/error.h>
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22#include <stddef.h>
23#include <stdint.h>
24#include <limits.h>
25#include <errno.h>
26#include <pthread.h>
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27#include <locale.h>
28#include <string.h>
29
30static bool utf8_output_supported;
31
32LTTNG_HIDDEN
33bool locale_supports_utf8(void)
34{
35 return utf8_output_supported;
36}
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37
38LTTNG_HIDDEN
39int timespec_to_ms(struct timespec ts, unsigned long *ms)
40{
41 unsigned long res, remain_ms;
42
43 if (ts.tv_sec > ULONG_MAX / MSEC_PER_SEC) {
44 errno = EOVERFLOW;
45 return -1; /* multiplication overflow */
46 }
47 res = ts.tv_sec * MSEC_PER_SEC;
48 remain_ms = ULONG_MAX - res;
49 if (ts.tv_nsec / NSEC_PER_MSEC > remain_ms) {
50 errno = EOVERFLOW;
51 return -1; /* addition overflow */
52 }
53 res += ts.tv_nsec / NSEC_PER_MSEC;
54 *ms = res;
55 return 0;
56}
57
58LTTNG_HIDDEN
59struct timespec timespec_abs_diff(struct timespec t1, struct timespec t2)
60{
61 uint64_t ts1 = (uint64_t) t1.tv_sec * (uint64_t) NSEC_PER_SEC +
62 (uint64_t) t1.tv_nsec;
63 uint64_t ts2 = (uint64_t) t2.tv_sec * (uint64_t) NSEC_PER_SEC +
64 (uint64_t) t2.tv_nsec;
65 uint64_t diff = max(ts1, ts2) - min(ts1, ts2);
66 struct timespec res;
67
68 res.tv_sec = diff / (uint64_t) NSEC_PER_SEC;
69 res.tv_nsec = diff % (uint64_t) NSEC_PER_SEC;
70 return res;
71}
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72
73static
74void __attribute__((constructor)) init_locale_utf8_support(void)
75{
76 const char *program_locale = setlocale(LC_ALL, NULL);
77 const char *lang = getenv("LANG");
78
79 if (program_locale && strstr(program_locale, "utf8")) {
80 utf8_output_supported = true;
0731b11e 81 } else if (lang && strstr(lang, "utf8")) {
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82 utf8_output_supported = true;
83 }
84}
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85
86LTTNG_HIDDEN
87int time_to_iso8601_str(time_t time, char *str, size_t len)
88{
89 int ret = 0;
90 struct tm *tm_result;
91 struct tm tm_storage;
92 size_t strf_ret;
93
94 if (len < ISO8601_STR_LEN) {
95 ERR("Buffer too short to format ISO 8601 timestamp: %zu bytes provided when at least %zu are needed",
96 len, ISO8601_STR_LEN);
97 ret = -1;
98 goto end;
99 }
100
101 tm_result = localtime_r(&time, &tm_storage);
102 if (!tm_result) {
103 ret = -1;
104 PERROR("Failed to break down timestamp to tm structure");
105 goto end;
106 }
107
108 strf_ret = strftime(str, len, "%Y%m%dT%H%M%S%z", tm_result);
109 if (strf_ret == 0) {
110 ret = -1;
111 ERR("Failed to format timestamp as local time");
112 goto end;
113 }
114end:
115 return ret;
116}
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