From: Serhiy Storchaka <storchaka@gmail.com>
Date: Wed, 22 Jul 2026 05:57:42 +0000 (+0300)
Subject: [3.15] gh-154416: Fix hanging test_tcflow on DragonFly BSD (GH-154417) (GH-154423)
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=566d678323fdc7ced1365db0a8d4abc8ab562c6f;p=thirdparty%2FPython%2Fcpython.git

[3.15] gh-154416: Fix hanging test_tcflow on DragonFly BSD (GH-154417) (GH-154423)

TCIOFF and TCION transmit STOP and START characters, and closing the
pseudo-terminal waits until they are read.  Discard them.
(cherry picked from commit b0c945a27e708419c6845234ef633ce3f7c4c41e)

Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>
---

diff --git a/Lib/test/test_termios.py b/Lib/test/test_termios.py
index 9fdf42c32952..709721952642 100644
--- a/Lib/test/test_termios.py
+++ b/Lib/test/test_termios.py
@@ -180,6 +180,9 @@ class TestFunctions(unittest.TestCase):
         termios.tcflow(self.fd, termios.TCOON)
         termios.tcflow(self.fd, termios.TCIOFF)
         termios.tcflow(self.fd, termios.TCION)
+        # Discard the transmitted STOP and START characters,
+        # otherwise closing the pseudo-terminal can block.
+        termios.tcflush(self.fd, termios.TCOFLUSH)
 
     @support.skip_android_selinux('tcflow')
     def test_tcflow_errors(self):