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-rw-r--r--pym/portage/tests/process/test_poll.py3
1 files changed, 3 insertions, 0 deletions
diff --git a/pym/portage/tests/process/test_poll.py b/pym/portage/tests/process/test_poll.py
index f1ddcb3dd..30816db2b 100644
--- a/pym/portage/tests/process/test_poll.py
+++ b/pym/portage/tests/process/test_poll.py
@@ -25,6 +25,9 @@ class PipeReaderTestCase(TestCase):
else:
got_pty = False
master_fd, slave_fd = os.pipe()
+
+ # WARNING: It is very important to use unbuffered mode here,
+ # in order to avoid issue 5380 with python3.
master_file = os.fdopen(master_fd, 'rb', 0)
slave_file = os.fdopen(slave_fd, 'wb', 0)
producer = SpawnProcess(