Warnings can cause application errors

[mhammond]

BPO	607668
Nosy	@loewis, @mhammond
Files	warnings.py.patch: Proposed fix

^{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/mhammond'
closed_at = <Date 2002-09-11.13:23:44.000>
created_at = <Date 2002-09-11.06:17:40.000>
labels = ['library']
title = 'Warnings can cause application errors'
updated_at = <Date 2002-09-11.13:23:44.000>
user = 'https://github.com/mhammond'

bugs.python.org fields:

activity = <Date 2002-09-11.13:23:44.000>
actor = 'mhammond'
assignee = 'mhammond'
closed = True
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2002-09-11.06:17:40.000>
creator = 'mhammond'
dependencies = []
files = ['615']
hgrepos = []
issue_num = 607668
keywords = []
message_count = 3.0
messages = ['12345', '12346', '12347']
nosy_count = 2.0
nosy_names = ['loewis', 'mhammond']
pr_nums = []
priority = 'normal'
resolution = 'fixed'
stage = None
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue607668'
versions = []

[mhammond]

If an application embeds Python while stderr is not
valid, warnings can cause unexpected exceptions in the
application. This is particularly a problem when it
happens *while* the application is attempting to create
a valid stderr :)

Pythonwin recently started failing to start with the
following traceback:

File "f:\src\python-cvs\lib\regsub.py", line 15, in ?
DeprecationWarning)
File "f:\src\python-cvs\lib\warnings.py", line 45, in
warn
warn_explicit(message, category, filename, lineno,
module, registry)
File "f:\src\python-cvs\lib\warnings.py", line 104,
in warn_explicit
showwarning(message, category, filename, lineno)
File "f:\src\python-cvs\lib\warnings.py", line 110,
in showwarning
file.write(formatwarning(message, category,
filename, lineno))
exceptions.IOError: (9, 'Bad file descriptor')

I propose that the warnings module ignore IOError
exceptions when writing the warning. Attaching
proposed fix.

Assigning to Martin for feedback - assign back for me
to check in.

[loewis]

Logged In: YES
user_id=21627

Looks good, please apply it.

[mhammond]

Logged In: YES
user_id=14198

Checking in warnings.py;
/cvsroot/python/python/dist/src/Lib/warnings.py,v <--
warnings.py
new revision: 1.17; previous revision: 1.16