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// Copyright 2019 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.
package robustio
import (
"errors"
"syscall"
"time"
)
const errFileNotFound = syscall.ERROR_FILE_NOT_FOUND
// isEphemeralError returns true if err may be resolved by waiting.
func isEphemeralError(err error) bool {
var errno syscall.Errno
if errors.As(err, &errno) {
switch errno {
case syscall.ERROR_ACCESS_DENIED,
syscall.ERROR_FILE_NOT_FOUND,
ERROR_SHARING_VIOLATION:
return true
}
}
return false
}
// Note: it may be convenient to have this helper return fs.FileInfo, but
// implementing this is actually quite involved on Windows. Since we only
// currently use mtime, keep it simple.
func getFileID(filename string) (FileID, time.Time, error) {
filename16, err := syscall.UTF16PtrFromString(filename)
if err != nil {
return FileID{}, time.Time{}, err
}
h, err := syscall.CreateFile(filename16, 0, 0, nil, syscall.OPEN_EXISTING, uint32(syscall.FILE_FLAG_BACKUP_SEMANTICS), 0)
if err != nil {
return FileID{}, time.Time{}, err
}
defer syscall.CloseHandle(h)
var i syscall.ByHandleFileInformation
if err := syscall.GetFileInformationByHandle(h, &i); err != nil {
return FileID{}, time.Time{}, err
}
mtime := time.Unix(0, i.LastWriteTime.Nanoseconds())
return FileID{
device: uint64(i.VolumeSerialNumber),
inode: uint64(i.FileIndexHigh)<<32 | uint64(i.FileIndexLow),
}, mtime, nil
}
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