Python considers pid longs under 64-bit Windows

[pitrou]

BPO	9613
Nosy	@birkenfeld, @amauryfa, @pitrou, @tjguk, @briancurtin

^{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 2013-10-13.18:37:49.512>
created_at = <Date 2010-08-15.18:02:25.836>
labels = ['extension-modules', 'interpreter-core', 'type-bug', 'invalid', 'OS-windows']
title = 'Python considers pid longs under 64-bit Windows'
updated_at = <Date 2013-10-13.18:37:49.511>
user = 'https://github.com/pitrou'

bugs.python.org fields:

activity = <Date 2013-10-13.18:37:49.511>
actor = 'pitrou'
assignee = 'none'
closed = True
closed_date = <Date 2013-10-13.18:37:49.512>
closer = 'pitrou'
components = ['Extension Modules', 'Interpreter Core', 'Windows']
creation = <Date 2010-08-15.18:02:25.836>
creator = 'pitrou'
dependencies = []
files = []
hgrepos = []
issue_num = 9613
keywords = []
message_count = 4.0
messages = ['113982', '115027', '199754', '199760']
nosy_count = 5.0
nosy_names = ['georg.brandl', 'amaury.forgeotdarc', 'pitrou', 'tim.golden', 'brian.curtin']
pr_nums = []
priority = 'normal'
resolution = 'not a bug'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue9613'
versions = ['Python 3.2']

[pitrou]

Under 64-bit Windows, Python aliases PyLong_FromPid() to PyLong_FromLong() (and PyLong_AsPid() to PyLong_AsLong()), but a C "long" is 32-bit, while apparently the MSVCRT defines a pid to be intptr_t, that is 64-bit. A potential loss of data ensues.

[amauryfa]

The spawn* functions return intptr_t, because it's the process handle.
But _getpid() returns an int.
Both seem to be correctly handled.

Which part do you suspect to truncate data?

[birkenfeld]

Antoine, ping?

[pitrou]

Amaury is right, it seems a Windows pid is an int after all. I don't know where I got the other impression :-)