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timestruct.go (2254B)

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