Holger Hildebrandt | fa07499 | 2020-03-27 15:42:06 +0000 | [diff] [blame^] | 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 | |
| 7 | package unix |
| 8 | |
| 9 | import "time" |
| 10 | |
| 11 | // TimespecToNsec converts a Timespec value into a number of |
| 12 | // nanoseconds since the Unix epoch. |
| 13 | func 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. |
| 17 | func 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. |
| 31 | func 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. |
| 47 | func 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. |
| 51 | func 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. |
| 64 | func (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. |
| 70 | func (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. |
| 75 | func (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. |
| 80 | func (tv *Timeval) Nano() int64 { |
| 81 | return int64(tv.Sec)*1e9 + int64(tv.Usec)*1000 |
| 82 | } |