C-API: Incorrect default value for Py_SetProgramName

[joukewitteveen]

BPO	43956
Nosy	@vstinner, @joukewitteveen
PRs	bpo-43956: Doc/c-api: Fix default program name #24876

^{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 2021-04-27.17:57:00.754>
labels = ['3.8', '3.9', '3.10', '3.11', '3.7', 'docs']
title = 'C-API: Incorrect default value for Py_SetProgramName'
updated_at = <Date 2021-05-21.15:51:45.214>
user = 'https://github.com/joukewitteveen'

bugs.python.org fields:

activity = <Date 2021-05-21.15:51:45.214>
actor = 'joukewitteveen'
assignee = 'docs@python'
closed = False
closed_date = None
closer = None
components = ['Documentation']
creation = <Date 2021-04-27.17:57:00.754>
creator = 'joukewitteveen'
dependencies = []
files = []
hgrepos = []
issue_num = 43956
keywords = []
message_count = 3.0
messages = ['392113', '393504', '394123']
nosy_count = 3.0
nosy_names = ['vstinner', 'docs@python', 'joukewitteveen']
pr_nums = ['24876']
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = None
url = 'https://bugs.python.org/issue43956'
versions = ['Python 3.6', 'Python 3.7', 'Python 3.8', 'Python 3.9', 'Python 3.10', 'Python 3.11']

[joukewitteveen]

The default program name is hardcoded in Python/initconfig.c:config_init_program_name. It is "python" on Windows, and "python3" elsewhere. The documentation currently suggests that it is "python" everywhere.

Additionally, the documentation currently says:

The argument should point to a zero-terminated wide character string in static storage whose contents will not change for the duration of the program’s execution.

The code, however, duplicates the string, so I am not sure this is true.