From 68aae8878ff90dd787db55ecc44ee712525ccdc6 Mon Sep 17 00:00:00 2001
From: SaJH <wogur981208@gmail.com>
Date: Wed, 24 Sep 2025 00:11:31 +0900
Subject: Fixed #36434 -- Preserved unbuffered stdio (-u) in autoreloader
 child.

Signed-off-by: SaJH <wogur981208@gmail.com>
---
 django/utils/autoreload.py | 13 +++++++++++++
 1 file changed, 13 insertions(+)

(limited to 'django/utils')

diff --git a/django/utils/autoreload.py b/django/utils/autoreload.py
index c6716215f5..99812979d7 100644
--- a/django/utils/autoreload.py
+++ b/django/utils/autoreload.py
@@ -268,6 +268,19 @@ def trigger_reload(filename):
 
 def restart_with_reloader():
     new_environ = {**os.environ, DJANGO_AUTORELOAD_ENV: "true"}
+    orig = getattr(sys, "orig_argv", ())
+    if any(
+        (arg == "-u")
+        or (
+            arg.startswith("-")
+            and not arg.startswith(("--", "-X", "-W"))
+            and len(arg) > 2
+            and arg[1:].isalpha()
+            and "u" in arg
+        )
+        for arg in orig[1:]
+    ):
+        new_environ.setdefault("PYTHONUNBUFFERED", "1")
     args = get_child_arguments()
     while True:
         p = subprocess.run(args, env=new_environ, close_fds=False)
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