Move time utils to their own time.c file
[lttng-tools.git] / src / common / time.c
CommitLineData
507f5694
JG
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>
25
26LTTNG_HIDDEN
27int timespec_to_ms(struct timespec ts, unsigned long *ms)
28{
29 unsigned long res, remain_ms;
30
31 if (ts.tv_sec > ULONG_MAX / MSEC_PER_SEC) {
32 errno = EOVERFLOW;
33 return -1; /* multiplication overflow */
34 }
35 res = ts.tv_sec * MSEC_PER_SEC;
36 remain_ms = ULONG_MAX - res;
37 if (ts.tv_nsec / NSEC_PER_MSEC > remain_ms) {
38 errno = EOVERFLOW;
39 return -1; /* addition overflow */
40 }
41 res += ts.tv_nsec / NSEC_PER_MSEC;
42 *ms = res;
43 return 0;
44}
45
46LTTNG_HIDDEN
47struct timespec timespec_abs_diff(struct timespec t1, struct timespec t2)
48{
49 uint64_t ts1 = (uint64_t) t1.tv_sec * (uint64_t) NSEC_PER_SEC +
50 (uint64_t) t1.tv_nsec;
51 uint64_t ts2 = (uint64_t) t2.tv_sec * (uint64_t) NSEC_PER_SEC +
52 (uint64_t) t2.tv_nsec;
53 uint64_t diff = max(ts1, ts2) - min(ts1, ts2);
54 struct timespec res;
55
56 res.tv_sec = diff / (uint64_t) NSEC_PER_SEC;
57 res.tv_nsec = diff % (uint64_t) NSEC_PER_SEC;
58 return res;
59}
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