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// +build aix darwin dragonfly freebsd linux netbsd openbsd solaris zos
7
8package unix
9
10import "time"
11
12// TimespecToNSec returns the time stored in ts as nanoseconds.
13func TimespecToNsec(ts Timespec) int64 { return ts.Nano() }
14
15// NsecToTimespec converts a number of nanoseconds into a Timespec.
16func NsecToTimespec(nsec int64) Timespec {
17	sec := nsec / 1e9
18	nsec = nsec % 1e9
19	if nsec < 0 {
20		nsec += 1e9
21		sec--
22	}
23	return setTimespec(sec, nsec)
24}
25
26// TimeToTimespec converts t into a Timespec.
27// On some 32-bit systems the range of valid Timespec values are smaller
28// than that of time.Time values.  So if t is out of the valid range of
29// Timespec, it returns a zero Timespec and ERANGE.
30func TimeToTimespec(t time.Time) (Timespec, error) {
31	sec := t.Unix()
32	nsec := int64(t.Nanosecond())
33	ts := setTimespec(sec, nsec)
34
35	// Currently all targets have either int32 or int64 for Timespec.Sec.
36	// If there were a new target with floating point type for it, we have
37	// to consider the rounding error.
38	if int64(ts.Sec) != sec {
39		return Timespec{}, ERANGE
40	}
41	return ts, nil
42}
43
44// TimevalToNsec returns the time stored in tv as nanoseconds.
45func TimevalToNsec(tv Timeval) int64 { return tv.Nano() }
46
47// NsecToTimeval converts a number of nanoseconds into a Timeval.
48func NsecToTimeval(nsec int64) Timeval {
49	nsec += 999 // round up to microsecond
50	usec := nsec % 1e9 / 1e3
51	sec := nsec / 1e9
52	if usec < 0 {
53		usec += 1e6
54		sec--
55	}
56	return setTimeval(sec, usec)
57}
58
59// Unix returns the time stored in ts as seconds plus nanoseconds.
60func (ts *Timespec) Unix() (sec int64, nsec int64) {
61	return int64(ts.Sec), int64(ts.Nsec)
62}
63
64// Unix returns the time stored in tv as seconds plus nanoseconds.
65func (tv *Timeval) Unix() (sec int64, nsec int64) {
66	return int64(tv.Sec), int64(tv.Usec) * 1000
67}
68
69// Nano returns the time stored in ts as nanoseconds.
70func (ts *Timespec) Nano() int64 {
71	return int64(ts.Sec)*1e9 + int64(ts.Nsec)
72}
73
74// Nano returns the time stored in tv as nanoseconds.
75func (tv *Timeval) Nano() int64 {
76	return int64(tv.Sec)*1e9 + int64(tv.Usec)*1000
77}
78