Function tcflow() in module termios can not be interupted when the second argument is 0

GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2021-03-24.05:36:13.737>
labels = ['type-bug', 'library', '3.10']
title = 'Function tcflow() in module termios can not be interupted when the second argument is 0'
updated_at = <Date 2021-03-24.05:36:13.737>
user = 'https://bugs.python.org/xxm'

bugs.python.org fields:

activity = <Date 2021-03-24.05:36:13.737>
actor = 'xxm'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2021-03-24.05:36:13.737>
creator = 'xxm'
dependencies = []
files = []
hgrepos = []
issue_num = 43611
keywords = []
message_count = 1.0
messages = ['389436']
nosy_count = 1.0
nosy_names = ['xxm']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue43611'
versions = ['Python 3.10']