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 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