1// 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}
83