golang timestruct 代码
文件路径：/src/cmd/vendor/golang.org/x/sys/unix/timestruct.go
/ 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
}