1 files changed, 27 insertions, 0 deletions
diff --git a/src/cmd/go/internal/robustio/robustio_windows.go b/src/cmd/go/internal/robustio/robustio_windows.go
new file mode 100644
index 0000000..687dcb6
--- /dev/null
+++ b/src/cmd/go/internal/robustio/robustio_windows.go
@@ -0,0 +1,27 @@
+// 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"
+	"internal/syscall/windows"
+	"syscall"
+)
+
+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,
+			windows.ERROR_SHARING_VIOLATION:
+			return true
+		}
+	}
+	return false
+}