From 280190248bfbadaec4575932dc956401f7bb6390 Mon Sep 17 00:00:00 2001
From: Felix Morgner <felix.morgner@gmail.com>
Date: Sat, 20 Jun 2026 11:09:03 +0200
Subject: lib: harden scoped attributes

---
 ttwhy/scoped_attributes.cppm | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

(limited to 'ttwhy/scoped_attributes.cppm')

diff --git a/ttwhy/scoped_attributes.cppm b/ttwhy/scoped_attributes.cppm
index c68ab01..080bca7 100644
--- a/ttwhy/scoped_attributes.cppm
+++ b/ttwhy/scoped_attributes.cppm
@@ -56,9 +56,15 @@ namespace ttwhy
   export struct scoped_attributes
   {
     explicit scoped_attributes(int file_descriptor)
-        : m_file_descriptor{::dup(file_descriptor)}
-        , m_attributes{read_attributes(file_descriptor)}
-    {}
+        : m_file_descriptor{-1}
+        , m_attributes{}
+    {
+      if (isatty(file_descriptor))
+      {
+        m_file_descriptor = dup(file_descriptor);
+        m_attributes = read_attributes(m_file_descriptor);
+      }
+    }
 
     scoped_attributes(scoped_attributes const &) = delete;
 
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