From 01dc412599947c2ab75ca8faf5fa04559d6c48de Mon Sep 17 00:00:00 2001
From: Michael Weigle <michael.weigle@gmail.com>
Date: Tue, 25 Aug 2020 19:03:45 -0400
Subject: [PATCH] Fixes RuntimeWarning for improper bufferring on local
 connection

(cherry picked from commit 6b5a46ccd0db58f89d19f5b05fd0f2628b722c44)
---
 mitogen/core.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mitogen/core.py b/mitogen/core.py
index 4dd44925..5deac358 100644
--- a/mitogen/core.py
+++ b/mitogen/core.py
@@ -3860,7 +3860,7 @@ class ExternalContext(object):
         else:
             core_src_fd = self.config.get('core_src_fd', 101)
             if core_src_fd:
-                fp = os.fdopen(core_src_fd, 'rb', 1)
+                fp = os.fdopen(core_src_fd, 'rb', 0)
                 try:
                     core_src = fp.read()
                     # Strip "ExternalContext.main()" call from last line.