From: Serhiy Storchaka <storchaka@gmail.com>
Date: Wed, 22 Jul 2026 05:07:53 +0000 (+0300)
Subject: gh-154416: Fix hanging test_tcflow on DragonFly BSD (GH-154417)
X-Git-Url: http://git.ipfire.org/gitweb/index.cgi?a=commitdiff_plain;h=b0c945a27e708419c6845234ef633ce3f7c4c41e;p=thirdparty%2FPython%2Fcpython.git

gh-154416: Fix hanging test_tcflow on DragonFly BSD (GH-154417)

TCIOFF and TCION transmit STOP and START characters, and closing the
pseudo-terminal waits until they are read.  Discard them.

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 ede23ec38860..2739b990e090 100644
--- a/Lib/test/test_termios.py
+++ b/Lib/test/test_termios.py
@@ -194,6 +194,9 @@ 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):