With invalid FD, os.device_encoding() returns None under Linux but raises an error under Windows

[pitrou]

BPO	5552
Nosy	@pitrou, @kristjanvalur

^{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 2009-03-24.14:18:52.082>
created_at = <Date 2009-03-24.13:42:04.236>
labels = ['interpreter-core', 'type-bug']
title = 'With invalid FD, os.device_encoding() returns None under Linux but raises an error under Windows'
updated_at = <Date 2009-03-24.14:18:52.080>
user = 'https://github.com/pitrou'

bugs.python.org fields:

activity = <Date 2009-03-24.14:18:52.080>
actor = 'pitrou'
assignee = 'none'
closed = True
closed_date = <Date 2009-03-24.14:18:52.082>
closer = 'pitrou'
components = ['Interpreter Core']
creation = <Date 2009-03-24.13:42:04.236>
creator = 'pitrou'
dependencies = []
files = []
hgrepos = []
issue_num = 5552
keywords = []
message_count = 5.0
messages = ['84079', '84080', '84083', '84085', '84086']
nosy_count = 2.0
nosy_names = ['pitrou', 'kristjan.jonsson']
pr_nums = []
priority = 'normal'
resolution = 'fixed'
stage = None
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue5552'
versions = ['Python 3.0', 'Python 3.1']

[pitrou]

This is a potentially annoying incompatibility between platforms.
Under Linux:

>>> import os
>>> print(os.device_encoding(1000))
None

[pitrou]

And under Windows:

>>> print(os.device_encoding(1000))
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
OSError: [Errno 9] Bad file descriptor

[pitrou]

This may be related to the following lines in posixmodule.c:

if (!_PyVerify_fd(fd))
return posix_error();

[kristjanvalur]

Right, None is clearly the right result. Fixed in revision 70581

[pitrou]

Thanks!