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timestruct.go (2326B)

      1 // Copyright 2017 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 //go:build aix || darwin || dragonfly || freebsd || linux || netbsd || openbsd || solaris || zos
      6 // +build aix darwin dragonfly freebsd linux netbsd openbsd solaris zos
      7 
      8 package unix
      9 
     10 import "time"
     11 
     12 // TimespecToNsec returns the time stored in ts as nanoseconds.
     13 func TimespecToNsec(ts Timespec) int64 { return ts.Nano() }
     14 
     15 // NsecToTimespec converts a number of nanoseconds into a Timespec.
     16 func NsecToTimespec(nsec int64) Timespec {
     17 	sec := nsec / 1e9
     18 	nsec = nsec % 1e9
     19 	if nsec < 0 {
     20 		nsec += 1e9
     21 		sec--
     22 	}
     23 	return setTimespec(sec, nsec)
     24 }
     25 
     26 // TimeToTimespec converts t into a Timespec.
     27 // On some 32-bit systems the range of valid Timespec values are smaller
     28 // than that of time.Time values.  So if t is out of the valid range of
     29 // Timespec, it returns a zero Timespec and ERANGE.
     30 func TimeToTimespec(t time.Time) (Timespec, error) {
     31 	sec := t.Unix()
     32 	nsec := int64(t.Nanosecond())
     33 	ts := setTimespec(sec, nsec)
     34 
     35 	// Currently all targets have either int32 or int64 for Timespec.Sec.
     36 	// If there were a new target with floating point type for it, we have
     37 	// to consider the rounding error.
     38 	if int64(ts.Sec) != sec {
     39 		return Timespec{}, ERANGE
     40 	}
     41 	return ts, nil
     42 }
     43 
     44 // TimevalToNsec returns the time stored in tv as nanoseconds.
     45 func TimevalToNsec(tv Timeval) int64 { return tv.Nano() }
     46 
     47 // NsecToTimeval converts a number of nanoseconds into a Timeval.
     48 func NsecToTimeval(nsec int64) Timeval {
     49 	nsec += 999 // round up to microsecond
     50 	usec := nsec % 1e9 / 1e3
     51 	sec := nsec / 1e9
     52 	if usec < 0 {
     53 		usec += 1e6
     54 		sec--
     55 	}
     56 	return setTimeval(sec, usec)
     57 }
     58 
     59 // Unix returns the time stored in ts as seconds plus nanoseconds.
     60 func (ts *Timespec) Unix() (sec int64, nsec int64) {
     61 	return int64(ts.Sec), int64(ts.Nsec)
     62 }
     63 
     64 // Unix returns the time stored in tv as seconds plus nanoseconds.
     65 func (tv *Timeval) Unix() (sec int64, nsec int64) {
     66 	return int64(tv.Sec), int64(tv.Usec) * 1000
     67 }
     68 
     69 // Nano returns the time stored in ts as nanoseconds.
     70 func (ts *Timespec) Nano() int64 {
     71 	return int64(ts.Sec)*1e9 + int64(ts.Nsec)
     72 }
     73 
     74 // Nano returns the time stored in tv as nanoseconds.
     75 func (tv *Timeval) Nano() int64 {
     76 	return int64(tv.Sec)*1e9 + int64(tv.Usec)*1000
     77 }