From 020890b922f3a5c218645e6f30c4306a1560039d Mon Sep 17 00:00:00 2001
From: A_A <21040751+Otto-AA@users.noreply.github.com>
Date: Sat, 9 May 2026 14:25:58 +0200
Subject: [PATCH] fix: ignore sockets and other non-file files

---
 src/mutmut/__main__.py | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/mutmut/__main__.py b/src/mutmut/__main__.py
index fb6dfc4c..748e85fb 100644
--- a/src/mutmut/__main__.py
+++ b/src/mutmut/__main__.py
@@ -146,7 +146,9 @@ def walk_all_files() -> Iterator[tuple[str, str]]:
                 continue
         for root, dirs, files in walk(path):
             for filename in files:
-                yield root, filename
+                # only yield actual files, no sockets/pipes/etc.
+                if isfile(Path(root) / filename):
+                    yield root, filename
 
 
 def walk_source_files() -> Iterator[Path]: