source: code/trunk/vendor/golang.org/x/sys/unix/timestruct.go@ 67

// Copyright 2017 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

//go:build aix || darwin || dragonfly || freebsd || linux || netbsd || openbsd || solaris || zos
// +build aix darwin dragonfly freebsd linux netbsd openbsd solaris zos

package unix

import "time"

// TimespecToNSec returns the time stored in ts as nanoseconds.
func TimespecToNsec(ts Timespec) int64 { return ts.Nano() }

// NsecToTimespec converts a number of nanoseconds into a Timespec.
func NsecToTimespec(nsec int64) Timespec {
        sec := nsec / 1e9
        nsec = nsec % 1e9
        if nsec < 0 {
                nsec += 1e9
                sec--
        }
        return setTimespec(sec, nsec)
}

// TimeToTimespec converts t into a Timespec.
// On some 32-bit systems the range of valid Timespec values are smaller
// than that of time.Time values.  So if t is out of the valid range of
// Timespec, it returns a zero Timespec and ERANGE.
func TimeToTimespec(t time.Time) (Timespec, error) {
        sec := t.Unix()
        nsec := int64(t.Nanosecond())
        ts := setTimespec(sec, nsec)

        // Currently all targets have either int32 or int64 for Timespec.Sec.
        // If there were a new target with floating point type for it, we have
        // to consider the rounding error.
        if int64(ts.Sec) != sec {
                return Timespec{}, ERANGE
        }
        return ts, nil
}

// TimevalToNsec returns the time stored in tv as nanoseconds.
func TimevalToNsec(tv Timeval) int64 { return tv.Nano() }

// NsecToTimeval converts a number of nanoseconds into a Timeval.
func NsecToTimeval(nsec int64) Timeval {
        nsec += 999 // round up to microsecond
        usec := nsec % 1e9 / 1e3
        sec := nsec / 1e9
        if usec < 0 {
                usec += 1e6
                sec--
        }
        return setTimeval(sec, usec)
}

// Unix returns the time stored in ts as seconds plus nanoseconds.
func (ts *Timespec) Unix() (sec int64, nsec int64) {
        return int64(ts.Sec), int64(ts.Nsec)
}

// Unix returns the time stored in tv as seconds plus nanoseconds.
func (tv *Timeval) Unix() (sec int64, nsec int64) {
        return int64(tv.Sec), int64(tv.Usec) * 1000
}

// Nano returns the time stored in ts as nanoseconds.
func (ts *Timespec) Nano() int64 {
        return int64(ts.Sec)*1e9 + int64(ts.Nsec)
}

// Nano returns the time stored in tv as nanoseconds.
func (tv *Timeval) Nano() int64 {
        return int64(tv.Sec)*1e9 + int64(tv.Usec)*1000
}