1 /*
2 * Copyright (C) 2013 The Android Open Source Project
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * * Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * * Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in
12 * the documentation and/or other materials provided with the
13 * distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
16 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
17 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
18 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
19 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
22 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
25 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29 #include "private/bionic_time_conversions.h"
30
31 #include "private/bionic_constants.h"
32
timespec_from_timeval(timespec & ts,const timeval & tv)33 bool timespec_from_timeval(timespec& ts, const timeval& tv) {
34 // Whole seconds can just be copied.
35 ts.tv_sec = tv.tv_sec;
36
37 // But we might overflow when converting microseconds to nanoseconds.
38 if (tv.tv_usec >= 1000000 || tv.tv_usec < 0) {
39 return false;
40 }
41 ts.tv_nsec = tv.tv_usec * 1000;
42 return true;
43 }
44
timespec_from_ms(timespec & ts,const int ms)45 void timespec_from_ms(timespec& ts, const int ms) {
46 ts.tv_sec = ms / 1000;
47 ts.tv_nsec = (ms % 1000) * 1000000;
48 }
49
timeval_from_timespec(timeval & tv,const timespec & ts)50 void timeval_from_timespec(timeval& tv, const timespec& ts) {
51 tv.tv_sec = ts.tv_sec;
52 tv.tv_usec = ts.tv_nsec / 1000;
53 }
54
monotonic_time_from_realtime_time(timespec & monotonic_time,const timespec & realtime_time)55 void monotonic_time_from_realtime_time(timespec& monotonic_time, const timespec& realtime_time) {
56 monotonic_time = realtime_time;
57
58 timespec cur_monotonic_time;
59 clock_gettime(CLOCK_MONOTONIC, &cur_monotonic_time);
60 timespec cur_realtime_time;
61 clock_gettime(CLOCK_REALTIME, &cur_realtime_time);
62
63 monotonic_time.tv_nsec -= cur_realtime_time.tv_nsec;
64 monotonic_time.tv_nsec += cur_monotonic_time.tv_nsec;
65 if (monotonic_time.tv_nsec >= NS_PER_S) {
66 monotonic_time.tv_nsec -= NS_PER_S;
67 monotonic_time.tv_sec += 1;
68 } else if (monotonic_time.tv_nsec < 0) {
69 monotonic_time.tv_nsec += NS_PER_S;
70 monotonic_time.tv_sec -= 1;
71 }
72 monotonic_time.tv_sec -= cur_realtime_time.tv_sec;
73 monotonic_time.tv_sec += cur_monotonic_time.tv_sec;
74 }
75