golang timestruct 代码
文件路径：/src/syscall/timestruct.go
/ Copyright 2016 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 unix || (js && wasm)
package syscall
/ 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)
}
/ 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)
}