Update

vendor/tailscale.com/net/neterror/neterror_plan9.go

@@ -0,0 +1,24 @@
+// Copyright (c) Tailscale Inc & contributors
+// SPDX-License-Identifier: BSD-3-Clause
+
+//go:build plan9
+
+package neterror
+
+import (
+	"errors"
+	"io"
+	"io/fs"
+	"strings"
+)
+
+// Reports whether err resulted from reading or writing to a closed or broken pipe.
+func IsClosedPipeError(err error) bool {
+	// Libraries may also return root errors like fs.ErrClosed/io.ErrClosedPipe
+	// due to a closed socket.
+	// For a raw syscall error, check for error string containing "closed pipe",
+	// per the note set by the system: https://9p.io/magic/man2html/2/pipe
+	return errors.Is(err, fs.ErrClosed) ||
+		errors.Is(err, io.ErrClosedPipe) ||
+		strings.Contains(err.Error(), "closed pipe")
+}