зеркало из https://github.com/golang/tools.git
52 строки
1.5 KiB
Go
52 строки
1.5 KiB
Go
// Copyright 2019 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package robustio
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import (
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"errors"
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"syscall"
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"time"
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)
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const errFileNotFound = syscall.ERROR_FILE_NOT_FOUND
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// isEphemeralError returns true if err may be resolved by waiting.
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func isEphemeralError(err error) bool {
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var errno syscall.Errno
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if errors.As(err, &errno) {
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switch errno {
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case syscall.ERROR_ACCESS_DENIED,
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syscall.ERROR_FILE_NOT_FOUND,
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ERROR_SHARING_VIOLATION:
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return true
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}
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}
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return false
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}
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// Note: it may be convenient to have this helper return fs.FileInfo, but
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// implementing this is actually quite involved on Windows. Since we only
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// currently use mtime, keep it simple.
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func getFileID(filename string) (FileID, time.Time, error) {
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filename16, err := syscall.UTF16PtrFromString(filename)
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if err != nil {
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return FileID{}, time.Time{}, err
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}
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h, err := syscall.CreateFile(filename16, 0, 0, nil, syscall.OPEN_EXISTING, uint32(syscall.FILE_FLAG_BACKUP_SEMANTICS), 0)
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if err != nil {
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return FileID{}, time.Time{}, err
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}
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defer syscall.CloseHandle(h)
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var i syscall.ByHandleFileInformation
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if err := syscall.GetFileInformationByHandle(h, &i); err != nil {
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return FileID{}, time.Time{}, err
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}
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mtime := time.Unix(0, i.LastWriteTime.Nanoseconds())
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return FileID{
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device: uint64(i.VolumeSerialNumber),
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inode: uint64(i.FileIndexHigh)<<32 | uint64(i.FileIndexLow),
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}, mtime, nil
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}
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