--- /dev/null
+// 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 (
+ "os"
+ "syscall"
+)
+
+const errFileNotFound = syscall.ERROR_FILE_NOT_FOUND
+
+// isEphemeralError returns true if err may be resolved by waiting.
+func isEphemeralError(err error) bool {
+ switch werr := err.(type) {
+ case *os.PathError:
+ err = werr.Err
+ case *os.LinkError:
+ err = werr.Err
+ case *os.SyscallError:
+ err = werr.Err
+ }
+ if errno, ok := err.(syscall.Errno); ok {
+ switch errno {
+ case syscall.ERROR_ACCESS_DENIED,
+ syscall.ERROR_FILE_NOT_FOUND,
+ ERROR_SHARING_VIOLATION:
+ return true
+ }
+ }
+ return false
+}