150 lines
3.3 KiB
Go
150 lines
3.3 KiB
Go
package times
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import (
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"os"
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"syscall"
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"time"
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"unsafe"
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)
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// Stat returns the Timespec for the given filename.
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func Stat(name string) (Timespec, error) {
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ts, err := platformSpecficStat(name)
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if err == nil {
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return ts, err
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}
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return stat(name, os.Stat)
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}
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// Lstat returns the Timespec for the given filename, and does not follow Symlinks.
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func Lstat(name string) (Timespec, error) {
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ts, err := platformSpecficLstat(name)
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if err == nil {
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return ts, err
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}
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return stat(name, os.Lstat)
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}
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type timespecEx struct {
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atime
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mtime
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ctime
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btime
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}
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// StatFile finds a Windows Timespec with ChangeTime.
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func StatFile(file *os.File) (Timespec, error) {
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return statFile(syscall.Handle(file.Fd()))
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}
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func statFile(h syscall.Handle) (Timespec, error) {
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var fileInfo fileBasicInfo
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if err := getFileInformationByHandleEx(h, &fileInfo); err != nil {
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return nil, err
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}
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var t timespecEx
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t.atime.v = time.Unix(0, fileInfo.LastAccessTime.Nanoseconds())
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t.mtime.v = time.Unix(0, fileInfo.LastWriteTime.Nanoseconds())
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t.ctime.v = time.Unix(0, fileInfo.ChangeTime.Nanoseconds())
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t.btime.v = time.Unix(0, fileInfo.CreationTime.Nanoseconds())
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return t, nil
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}
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func platformSpecficLstat(name string) (Timespec, error) {
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if findProcErr != nil {
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return nil, findProcErr
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}
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isSym, err := isSymlink(name)
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if err != nil {
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return nil, err
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}
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var attrs = uint32(syscall.FILE_FLAG_BACKUP_SEMANTICS)
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if isSym {
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attrs |= syscall.FILE_FLAG_OPEN_REPARSE_POINT
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}
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return openHandleAndStat(name, attrs)
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}
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func isSymlink(name string) (bool, error) {
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fi, err := os.Lstat(name)
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if err != nil {
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return false, err
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}
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return fi.Mode()&os.ModeSymlink != 0, nil
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}
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func platformSpecficStat(name string) (Timespec, error) {
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if findProcErr != nil {
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return nil, findProcErr
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}
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return openHandleAndStat(name, syscall.FILE_FLAG_BACKUP_SEMANTICS)
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}
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func openHandleAndStat(name string, attrs uint32) (Timespec, error) {
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pathp, e := syscall.UTF16PtrFromString(name)
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if e != nil {
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return nil, e
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}
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h, e := syscall.CreateFile(pathp,
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syscall.FILE_WRITE_ATTRIBUTES, syscall.FILE_SHARE_WRITE, nil,
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syscall.OPEN_EXISTING, attrs, 0)
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if e != nil {
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return nil, e
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}
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defer syscall.Close(h)
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return statFile(h)
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}
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var (
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findProcErr error
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procGetFileInformationByHandleEx *syscall.Proc
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)
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func init() {
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var modkernel32 *syscall.DLL
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if modkernel32, findProcErr = syscall.LoadDLL("kernel32.dll"); findProcErr == nil {
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procGetFileInformationByHandleEx, findProcErr = modkernel32.FindProc("GetFileInformationByHandleEx")
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}
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}
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// fileBasicInfo holds the C++ data for FileTimes.
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//
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// https://msdn.microsoft.com/en-us/library/windows/desktop/aa364217(v=vs.85).aspx
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type fileBasicInfo struct {
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CreationTime syscall.Filetime
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LastAccessTime syscall.Filetime
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LastWriteTime syscall.Filetime
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ChangeTime syscall.Filetime
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FileAttributes uint32
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_ uint32 // padding
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}
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type fileInformationClass int
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const (
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fileBasicInfoClass fileInformationClass = iota
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)
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func getFileInformationByHandleEx(handle syscall.Handle, data *fileBasicInfo) (err error) {
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if findProcErr != nil {
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return findProcErr
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}
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r1, _, e1 := syscall.Syscall6(procGetFileInformationByHandleEx.Addr(), 4, uintptr(handle), uintptr(fileBasicInfoClass), uintptr(unsafe.Pointer(data)), unsafe.Sizeof(*data), 0, 0)
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if r1 == 0 {
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if e1 != 0 {
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err = error(e1)
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} else {
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err = syscall.EINVAL
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}
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}
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return
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}
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