fix possible overflow in select()

[tmick]

BPO	400519
Nosy	@gvanrossum
Files	None: None

^{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 = 'https://github.com/gvanrossum'
closed_at = <Date 2000-06-07.03:26:12.000>
created_at = <Date 2000-06-07.03:21:17.000>
labels = []
title = 'fix possible overflow in select()'
updated_at = <Date 2000-06-07.03:26:12.000>
user = 'https://bugs.python.org/tmick'

bugs.python.org fields:

activity = <Date 2000-06-07.03:26:12.000>
actor = 'tmick'
assignee = 'gvanrossum'
closed = True
closed_date = None
closer = None
components = ['None']
creation = <Date 2000-06-07.03:21:17.000>
creator = 'tmick'
dependencies = []
files = ['2450']
hgrepos = []
issue_num = 400519
keywords = ['patch']
message_count = 3.0
messages = ['32768', '32769', '32770']
nosy_count = 2.0
nosy_names = ['gvanrossum', 'tmick']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue400519'
versions = []

[tmick]

No description provided.

[tmick]

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[tmick]

This patches fixes a possible overflow of the optional timeout parameter for
the select() function (selectmodule.c). This timeout is passed in as a double
and then truncated to an int. If the double is sufficiently large you can get
unexpected results as it overflows. This patch raises an overflow if the
given select timeout overflows.