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os.waitpid does not return (0,0) when child has not exited (FreeBSD) #71995

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CaseyLucas mannequin opened this issue Aug 19, 2016 · 2 comments
Open

os.waitpid does not return (0,0) when child has not exited (FreeBSD) #71995

CaseyLucas mannequin opened this issue Aug 19, 2016 · 2 comments
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OS-freebsd stdlib Python modules in the Lib dir

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@CaseyLucas
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CaseyLucas mannequin commented Aug 19, 2016

BPO 27808
Nosy @koobs, @iritkatriel
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  • waitpid_test.py: test to show invalid waitpid return value
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    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 = None
created_at = <Date 2016-08-19.23:59:55.148>
labels = ['library']
title = 'os.waitpid does not return (0,0) when child has not exited (FreeBSD)'
updated_at = <Date 2021-06-24.23:46:36.491>
user = 'https://bugs.python.org/CaseyLucas'

    bugs.python.org fields:

    activity = <Date 2021-06-24.23:46:36.491>
actor = 'iritkatriel'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Library (Lib)', 'FreeBSD']
creation = <Date 2016-08-19.23:59:55.148>
creator = 'Casey Lucas'
dependencies = []
files = ['44161']
hgrepos = []
issue_num = 27808
keywords = []
message_count = 2.0
messages = ['273167', '396519']
nosy_count = 3.0
nosy_names = ['koobs', 'Casey Lucas', 'iritkatriel']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = None
url = 'https://bugs.python.org/issue27808'
versions = ['Python 2.7', 'Python 3.4']
    @CaseyLucas
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    CaseyLucas mannequin commented Aug 19, 2016

    I'm not sure if this a Python issue or a FreeBSD issue but the return value from os.waitpid is not reliably (0,0) on FreeBSD when the WNOHANG is used and the child process has not yet exited. Python docs say that the return value will be (0,0) but this is not the case. I believe it is because the FreeBSD implementation of waitpid writes an uninitialized value to the status field when a child process is not available. See also: http://stackoverflow.com/questions/38984449/is-status-value-from-os-waitpid-unreliable-when-os-wnohang-is-used-under-freebsd

    Maybe this is just a documentation issue? Or does the C code in the Python library need to handle this case?

    @CaseyLucas CaseyLucas mannequin added the stdlib Python modules in the Lib dir label Aug 19, 2016
    @iritkatriel
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    See also bpo-34278, bpo-38802, bpo-41825.

    @ezio-melotti ezio-melotti transferred this issue from another repository Apr 10, 2022
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