multiprocessing: string arg to SystemExit

[DanNawrocki]

BPO	23658
Nosy	@applio

^{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 2015-03-16.14:09:03.775>
created_at = <Date 2015-03-13.15:22:22.122>
labels = ['invalid', 'type-bug', 'library']
title = 'multiprocessing: string arg to SystemExit'
updated_at = <Date 2015-03-16.14:09:03.773>
user = 'https://bugs.python.org/DanNawrocki'

bugs.python.org fields:

activity = <Date 2015-03-16.14:09:03.773>
actor = 'Dan Nawrocki'
assignee = 'none'
closed = True
closed_date = <Date 2015-03-16.14:09:03.775>
closer = 'Dan Nawrocki'
components = ['Library (Lib)']
creation = <Date 2015-03-13.15:22:22.122>
creator = 'Dan Nawrocki'
dependencies = []
files = []
hgrepos = []
issue_num = 23658
keywords = []
message_count = 3.0
messages = ['238034', '238054', '238206']
nosy_count = 3.0
nosy_names = ['sbt', 'davin', 'Dan Nawrocki']
pr_nums = []
priority = 'normal'
resolution = 'not a bug'
stage = None
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue23658'
versions = ['Python 2.7']

[DanNawrocki]

It seems that the fix for 13854 (http://bugs.python.org/issue13854) actually tried to solve 2 issues:

1. handle non-integer, non-string arg to SystemExit
2. use exit code of 0 when the arg was a string

The change involved for #2 seems to go against the documentation for sys.exit:

"...In particular, sys.exit("some error message") is a quick way to exit a program when an error occurs."

Indeed, python 2.7.5 appears to follow this behavior:

[me@localhost ~]$ python -c 'raise SystemExit("bye")'; echo $?
bye
1

Shouldn't the return code from a subprocess when using multiprocessing match the return code when called w/o the multiprocessing module?

[applio]

Are you looking at the current code in the 2.7 branch or just at the code committed in https://hg.python.org/cpython/rev/da5b370f41a1 (done as part of bpo-13854)?

The code in 2.7 has since been updated and appears to use an exitcode of 1 whenever a str is provided as the arg to SystemExit.

Are you observing something different in practice?

[DanNawrocki]

I am using 2.7.5 (RHEL7 and FC20). Indeed, this issue appears fixed in 2.7.7, by https://hg.python.org/cpython/diff/44b5ec2f0f5d/Lib/multiprocessing/process.py.

I'm closing as not a bug.

Thanks for the help!