libgo/go/syscall/timestruct.go

   1 // Copyright 2016 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 aix darwin dragonfly freebsd js,wasm linux nacl netbsd openbsd solaris
   6
   7 package syscall
   8
   9 // TimespecToNsec converts a Timespec value into a number of
  10 // nanoseconds since the Unix epoch.
  11 func TimespecToNsec(ts Timespec) int64 { return int64(ts.Sec)*1e9 + int64(ts.Nsec) }
  12
  13 // NsecToTimespec takes a number of nanoseconds since the Unix epoch
  14 // and returns the corresponding Timespec value.
  15 func NsecToTimespec(nsec int64) Timespec {
  16         sec := nsec / 1e9
  17         nsec = nsec % 1e9
  18         if nsec < 0 {
  19                 nsec += 1e9
  20                 sec--
  21         }
  22         return setTimespec(sec, nsec)
  23 }
  24
  25 // TimevalToNsec converts a Timeval value into a number of nanoseconds
  26 // since the Unix epoch.
  27 func TimevalToNsec(tv Timeval) int64 { return int64(tv.Sec)*1e9 + int64(tv.Usec)*1e3 }
  28
  29 // NsecToTimeval takes a number of nanoseconds since the Unix epoch
  30 // and returns the corresponding Timeval value.
  31 func NsecToTimeval(nsec int64) Timeval {
  32         nsec += 999 // round up to microsecond
  33         usec := nsec % 1e9 / 1e3
  34         sec := nsec / 1e9
  35         if usec < 0 {
  36                 usec += 1e6
  37                 sec--
  38         }
  39         return setTimeval(sec, usec)
  40 }