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// Copyright 2009 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.
// http://golang.org/src/os/stat_linux.go
package times
import (
"errors"
"os"
"sync/atomic"
"syscall"
"time"
"golang.org/x/sys/unix"
)
// HasChangeTime and HasBirthTime are true if and only if
// the target OS supports them.
const (
HasChangeTime = true
HasBirthTime = false
)
type timespec struct {
atime
mtime
ctime
nobtime
}
type timespecBtime struct {
atime
mtime
ctime
btime
}
var (
supportsStatx int32 = 1
statxFunc = unix.Statx
)
func isStatXSupported() bool {
return atomic.LoadInt32(&supportsStatx) == 1
}
func isStatXUnsupported(err error) bool {
// linux 4.10 and earlier does not support Statx syscall
if err != nil && errors.Is(err, unix.ENOSYS) {
atomic.StoreInt32(&supportsStatx, 0)
return true
}
return false
}
// Stat returns the Timespec for the given filename.
func Stat(name string) (Timespec, error) {
if isStatXSupported() {
ts, err := statX(name)
if err == nil {
return ts, nil
}
if !isStatXUnsupported(err) {
return nil, err
}
// Fallback.
}
return stat(name, os.Stat)
}
func statX(name string) (Timespec, error) {
// https://man7.org/linux/man-pages/man2/statx.2.html
var statx unix.Statx_t
err := statxFunc(unix.AT_FDCWD, name, unix.AT_STATX_SYNC_AS_STAT, unix.STATX_ATIME|unix.STATX_MTIME|unix.STATX_CTIME|unix.STATX_BTIME, &statx)
if err != nil {
return nil, err
}
return extractTimes(&statx), nil
}
// Lstat returns the Timespec for the given filename, and does not follow Symlinks.
func Lstat(name string) (Timespec, error) {
if isStatXSupported() {
ts, err := lstatx(name)
if err == nil {
return ts, nil
}
if !isStatXUnsupported(err) {
return nil, err
}
// Fallback.
}
return stat(name, os.Lstat)
}
func lstatx(name string) (Timespec, error) {
// https://man7.org/linux/man-pages/man2/statx.2.html
var statX unix.Statx_t
err := statxFunc(unix.AT_FDCWD, name, unix.AT_STATX_SYNC_AS_STAT|unix.AT_SYMLINK_NOFOLLOW, unix.STATX_ATIME|unix.STATX_MTIME|unix.STATX_CTIME|unix.STATX_BTIME, &statX)
if err != nil {
return nil, err
}
return extractTimes(&statX), nil
}
func statXFile(file *os.File) (Timespec, error) {
sc, err := file.SyscallConn()
if err != nil {
return nil, err
}
var statx unix.Statx_t
var statxErr error
err = sc.Control(func(fd uintptr) {
// https://man7.org/linux/man-pages/man2/statx.2.html
statxErr = statxFunc(int(fd), "", unix.AT_EMPTY_PATH|unix.AT_STATX_SYNC_AS_STAT, unix.STATX_ATIME|unix.STATX_MTIME|unix.STATX_CTIME|unix.STATX_BTIME, &statx)
})
if err != nil {
return nil, err
}
if statxErr != nil {
return nil, statxErr
}
return extractTimes(&statx), nil
}
// StatFile returns the Timespec for the given *os.File.
func StatFile(file *os.File) (Timespec, error) {
if isStatXSupported() {
ts, err := statXFile(file)
if err == nil {
return ts, nil
}
if !isStatXUnsupported(err) {
return nil, err
}
// Fallback.
}
return statFile(file)
}
func statFile(file *os.File) (Timespec, error) {
fi, err := file.Stat()
if err != nil {
return nil, err
}
return getTimespec(fi), nil
}
func statxTimestampToTime(ts unix.StatxTimestamp) time.Time {
return time.Unix(ts.Sec, int64(ts.Nsec))
}
func extractTimes(statx *unix.Statx_t) Timespec {
if statx.Mask&unix.STATX_BTIME == unix.STATX_BTIME {
var t timespecBtime
t.atime.v = statxTimestampToTime(statx.Atime)
t.mtime.v = statxTimestampToTime(statx.Mtime)
t.ctime.v = statxTimestampToTime(statx.Ctime)
t.btime.v = statxTimestampToTime(statx.Btime)
return t
}
var t timespec
t.atime.v = statxTimestampToTime(statx.Atime)
t.mtime.v = statxTimestampToTime(statx.Mtime)
t.ctime.v = statxTimestampToTime(statx.Ctime)
return t
}
func timespecToTime(ts syscall.Timespec) time.Time {
return time.Unix(int64(ts.Sec), int64(ts.Nsec))
}
func getTimespec(fi os.FileInfo) (t timespec) {
stat := fi.Sys().(*syscall.Stat_t)
t.atime.v = timespecToTime(stat.Atim)
t.mtime.v = timespecToTime(stat.Mtim)
t.ctime.v = timespecToTime(stat.Ctim)
return t
}
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