1 files changed, 26 insertions, 0 deletions
diff --git a/internal/robustio/robustio_plan9.go b/internal/robustio/robustio_plan9.go
new file mode 100644
index 000000000..9fa4cacb5
--- /dev/null
+++ b/internal/robustio/robustio_plan9.go
@@ -0,0 +1,26 @@
+// Copyright 2022 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.
+
+//go:build plan9
+// +build plan9
+
+package robustio
+
+import (
+	"os"
+	"syscall"
+	"time"
+)
+
+func getFileID(filename string) (FileID, time.Time, error) {
+	fi, err := os.Stat(filename)
+	if err != nil {
+		return FileID{}, time.Time{}, err
+	}
+	dir := fi.Sys().(*syscall.Dir)
+	return FileID{
+		device: uint64(dir.Type)<<32 | uint64(dir.Dev),
+		inode:  dir.Qid.Path,
+	}, fi.ModTime(), nil
+}