Python doesn't exit with proper resultcode on SIGINT in runpy (pymain_run_module)

[graingert]

BPO	41602
Nosy	@gvanrossum, @gpshead, @ncoghlan, @ambv, @eryksun, @graingert
PRs	bpo-41602: raise SIGINT exit code on KeyboardInterrupt from pymain_run_module #21956 [3.9] bpo-41602: raise SIGINT exit code on KeyboardInterrupt from pymain_run_module (GH-21956) #22397 [3.8] bpo-41602: raise SIGINT exit code on KeyboardInterrupt from pymain_run_module (GH-21956) #22398
Files	test_exit.py test_exit.txt test_exit_runpy.py test_exit_command_stdin.py

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2020-09-22.15:53:35.762>
created_at = <Date 2020-08-20.19:58:37.660>
labels = ['interpreter-core', 'type-bug', '3.8', '3.9', '3.10']
title = "Python doesn't exit with proper resultcode on SIGINT in runpy (pymain_run_module)"
updated_at = <Date 2020-10-05.16:10:20.261>
user = 'https://github.com/graingert'

bugs.python.org fields:

activity = <Date 2020-10-05.16:10:20.261>
actor = 'lukasz.langa'
assignee = 'none'
closed = True
closed_date = <Date 2020-09-22.15:53:35.762>
closer = 'gvanrossum'
components = ['Interpreter Core']
creation = <Date 2020-08-20.19:58:37.660>
creator = 'graingert'
dependencies = []
files = ['49414', '49415', '49416', '49417']
hgrepos = []
issue_num = 41602
keywords = ['patch']
message_count = 22.0
messages = ['375732', '375733', '375735', '375736', '375775', '375898', '376984', '377000', '377012', '377013', '377014', '377019', '377020', '377021', '377022', '377024', '377027', '377028', '377339', '377447', '377451', '378057']
nosy_count = 6.0
nosy_names = ['gvanrossum', 'gregory.p.smith', 'ncoghlan', 'lukasz.langa', 'eryksun', 'graingert']
pr_nums = ['21956', '22397', '22398']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue41602'
versions = ['Python 3.8', 'Python 3.9', 'Python 3.10']

[graingert]

when running "python -m ham.py" KeyboardInterrupt should result in -2, but results in 1

see test case

[graingert]

see also https://bugs.python.org/issue1054041

[graingert]

I think I've eliminated runpy.py, as I still get a -2 when using:

import runpy
runpy.run_module("ham")

or

runpy._run_module_as_main("ham")

see attached test_exit_runpy.py

It seems the only difference is if pymain_run_file or pymain_run_module is used.

[graingert]

I've now eliminated pymain_run_stdin and pymain_run_command, both process a KeyboardInterrupt as -2

see attached test_exit_command_stdin.py

[graingert]

adding vstinner, as this seems related to pymain_run_module rather than runpy