83 lines
2.5 KiB
Go
83 lines
2.5 KiB
Go
// Copyright 2017 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// +build darwin dragonfly freebsd linux netbsd openbsd solaris
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package unix
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import "time"
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// TimespecToNsec converts a Timespec value into a number of
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// nanoseconds since the Unix epoch.
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func TimespecToNsec(ts Timespec) int64 { return int64(ts.Sec)*1e9 + int64(ts.Nsec) }
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// NsecToTimespec takes a number of nanoseconds since the Unix epoch
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// and returns the corresponding Timespec value.
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func NsecToTimespec(nsec int64) Timespec {
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sec := nsec / 1e9
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nsec = nsec % 1e9
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if nsec < 0 {
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nsec += 1e9
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sec--
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}
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return setTimespec(sec, nsec)
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}
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// TimeToTimespec converts t into a Timespec.
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// On some 32-bit systems the range of valid Timespec values are smaller
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// than that of time.Time values. So if t is out of the valid range of
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// Timespec, it returns a zero Timespec and ERANGE.
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func TimeToTimespec(t time.Time) (Timespec, error) {
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sec := t.Unix()
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nsec := int64(t.Nanosecond())
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ts := setTimespec(sec, nsec)
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// Currently all targets have either int32 or int64 for Timespec.Sec.
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// If there were a new target with floating point type for it, we have
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// to consider the rounding error.
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if int64(ts.Sec) != sec {
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return Timespec{}, ERANGE
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}
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return ts, nil
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}
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// TimevalToNsec converts a Timeval value into a number of nanoseconds
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// since the Unix epoch.
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func TimevalToNsec(tv Timeval) int64 { return int64(tv.Sec)*1e9 + int64(tv.Usec)*1e3 }
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// NsecToTimeval takes a number of nanoseconds since the Unix epoch
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// and returns the corresponding Timeval value.
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func NsecToTimeval(nsec int64) Timeval {
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nsec += 999 // round up to microsecond
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usec := nsec % 1e9 / 1e3
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sec := nsec / 1e9
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if usec < 0 {
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usec += 1e6
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sec--
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}
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return setTimeval(sec, usec)
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}
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// Unix returns ts as the number of seconds and nanoseconds elapsed since the
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// Unix epoch.
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func (ts *Timespec) Unix() (sec int64, nsec int64) {
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return int64(ts.Sec), int64(ts.Nsec)
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}
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// Unix returns tv as the number of seconds and nanoseconds elapsed since the
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// Unix epoch.
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func (tv *Timeval) Unix() (sec int64, nsec int64) {
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return int64(tv.Sec), int64(tv.Usec) * 1000
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}
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// Nano returns ts as the number of nanoseconds elapsed since the Unix epoch.
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func (ts *Timespec) Nano() int64 {
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return int64(ts.Sec)*1e9 + int64(ts.Nsec)
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}
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// Nano returns tv as the number of nanoseconds elapsed since the Unix epoch.
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func (tv *Timeval) Nano() int64 {
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return int64(tv.Sec)*1e9 + int64(tv.Usec)*1000
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}
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