blob: 4a672f56942abd067302123f5da066b038d79807 [file] [log] [blame]
Holger Hildebrandtfa074992020-03-27 15:42:06 +00001// Copyright 2017 The Go Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style
3// license that can be found in the LICENSE file.
4
5// +build aix darwin dragonfly freebsd linux netbsd openbsd solaris
6
7package unix
8
9import "time"
10
11// TimespecToNsec converts a Timespec value into a number of
12// nanoseconds since the Unix epoch.
13func TimespecToNsec(ts Timespec) int64 { return int64(ts.Sec)*1e9 + int64(ts.Nsec) }
14
15// NsecToTimespec takes a number of nanoseconds since the Unix epoch
16// and returns the corresponding Timespec value.
17func NsecToTimespec(nsec int64) Timespec {
18 sec := nsec / 1e9
19 nsec = nsec % 1e9
20 if nsec < 0 {
21 nsec += 1e9
22 sec--
23 }
24 return setTimespec(sec, nsec)
25}
26
27// TimeToTimespec converts t into a Timespec.
28// On some 32-bit systems the range of valid Timespec values are smaller
29// than that of time.Time values. So if t is out of the valid range of
30// Timespec, it returns a zero Timespec and ERANGE.
31func TimeToTimespec(t time.Time) (Timespec, error) {
32 sec := t.Unix()
33 nsec := int64(t.Nanosecond())
34 ts := setTimespec(sec, nsec)
35
36 // Currently all targets have either int32 or int64 for Timespec.Sec.
37 // If there were a new target with floating point type for it, we have
38 // to consider the rounding error.
39 if int64(ts.Sec) != sec {
40 return Timespec{}, ERANGE
41 }
42 return ts, nil
43}
44
45// TimevalToNsec converts a Timeval value into a number of nanoseconds
46// since the Unix epoch.
47func TimevalToNsec(tv Timeval) int64 { return int64(tv.Sec)*1e9 + int64(tv.Usec)*1e3 }
48
49// NsecToTimeval takes a number of nanoseconds since the Unix epoch
50// and returns the corresponding Timeval value.
51func NsecToTimeval(nsec int64) Timeval {
52 nsec += 999 // round up to microsecond
53 usec := nsec % 1e9 / 1e3
54 sec := nsec / 1e9
55 if usec < 0 {
56 usec += 1e6
57 sec--
58 }
59 return setTimeval(sec, usec)
60}
61
62// Unix returns ts as the number of seconds and nanoseconds elapsed since the
63// Unix epoch.
64func (ts *Timespec) Unix() (sec int64, nsec int64) {
65 return int64(ts.Sec), int64(ts.Nsec)
66}
67
68// Unix returns tv as the number of seconds and nanoseconds elapsed since the
69// Unix epoch.
70func (tv *Timeval) Unix() (sec int64, nsec int64) {
71 return int64(tv.Sec), int64(tv.Usec) * 1000
72}
73
74// Nano returns ts as the number of nanoseconds elapsed since the Unix epoch.
75func (ts *Timespec) Nano() int64 {
76 return int64(ts.Sec)*1e9 + int64(ts.Nsec)
77}
78
79// Nano returns tv as the number of nanoseconds elapsed since the Unix epoch.
80func (tv *Timeval) Nano() int64 {
81 return int64(tv.Sec)*1e9 + int64(tv.Usec)*1000
82}