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//go:build aix || darwin || dragonfly || freebsd || linux || netbsd || openbsd || solaris || zos
 6
 7package unix
 8
 9import "time"
10
11// TimespecToNsec returns the time stored in ts as nanoseconds.
12func TimespecToNsec(ts Timespec) int64 { return ts.Nano() }
13
14// NsecToTimespec converts a number of nanoseconds into a Timespec.
15func NsecToTimespec(nsec int64) Timespec {
16	sec := nsec / 1e9
17	nsec = nsec % 1e9
18	if nsec < 0 {
19		nsec += 1e9
20		sec--
21	}
22	return setTimespec(sec, nsec)
23}
24
25// TimeToTimespec converts t into a Timespec.
26// On some 32-bit systems the range of valid Timespec values are smaller
27// than that of time.Time values.  So if t is out of the valid range of
28// Timespec, it returns a zero Timespec and ERANGE.
29func TimeToTimespec(t time.Time) (Timespec, error) {
30	sec := t.Unix()
31	nsec := int64(t.Nanosecond())
32	ts := setTimespec(sec, nsec)
33
34	// Currently all targets have either int32 or int64 for Timespec.Sec.
35	// If there were a new target with floating point type for it, we have
36	// to consider the rounding error.
37	if int64(ts.Sec) != sec {
38		return Timespec{}, ERANGE
39	}
40	return ts, nil
41}
42
43// TimevalToNsec returns the time stored in tv as nanoseconds.
44func TimevalToNsec(tv Timeval) int64 { return tv.Nano() }
45
46// NsecToTimeval converts a number of nanoseconds into a Timeval.
47func NsecToTimeval(nsec int64) Timeval {
48	nsec += 999 // round up to microsecond
49	usec := nsec % 1e9 / 1e3
50	sec := nsec / 1e9
51	if usec < 0 {
52		usec += 1e6
53		sec--
54	}
55	return setTimeval(sec, usec)
56}
57
58// Unix returns the time stored in ts as seconds plus nanoseconds.
59func (ts *Timespec) Unix() (sec int64, nsec int64) {
60	return int64(ts.Sec), int64(ts.Nsec)
61}
62
63// Unix returns the time stored in tv as seconds plus nanoseconds.
64func (tv *Timeval) Unix() (sec int64, nsec int64) {
65	return int64(tv.Sec), int64(tv.Usec) * 1000
66}
67
68// Nano returns the time stored in ts as nanoseconds.
69func (ts *Timespec) Nano() int64 {
70	return int64(ts.Sec)*1e9 + int64(ts.Nsec)
71}
72
73// Nano returns the time stored in tv as nanoseconds.
74func (tv *Timeval) Nano() int64 {
75	return int64(tv.Sec)*1e9 + int64(tv.Usec)*1000
76}