github.com/giovannyortegon/go@v0.0.0-20220115155912-8890063f5bdd/src/pkg/mod/golang.org/x/sys@v0.0.0-20210927094055-39ccf1dd6fa6/unix/timestruct.go (about)

     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  }