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readline fails on nonblocking, unbuffered io.FileIO objects #58066

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anacrolix mannequin opened this issue Jan 25, 2012 · 2 comments
Closed

readline fails on nonblocking, unbuffered io.FileIO objects #58066

anacrolix mannequin opened this issue Jan 25, 2012 · 2 comments
Labels
stdlib Python modules in the Lib dir topic-IO type-bug An unexpected behavior, bug, or error

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@anacrolix
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Mannequin

anacrolix mannequin commented Jan 25, 2012

BPO 13858
Nosy @anacrolix
Superseder
  • bpo-13322: The io module doesn't support non-blocking files
    		•

    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 2012-01-25.08:22:32.059>
created_at = <Date 2012-01-25.05:13:47.771>
labels = ['type-bug', 'library', 'expert-IO']
title = 'readline fails on nonblocking, unbuffered io.FileIO objects'
updated_at = <Date 2012-01-25.08:22:32.050>
user = 'https://github.com/anacrolix'

    bugs.python.org fields:

    activity = <Date 2012-01-25.08:22:32.050>
actor = 'neologix'
assignee = 'none'
closed = True
closed_date = <Date 2012-01-25.08:22:32.059>
closer = 'neologix'
components = ['Library (Lib)', 'IO']
creation = <Date 2012-01-25.05:13:47.771>
creator = 'anacrolix'
dependencies = []
files = []
hgrepos = []
issue_num = 13858
keywords = []
message_count = 2.0
messages = ['151933', '151935']
nosy_count = 2.0
nosy_names = ['anacrolix', 'neologix']
pr_nums = []
priority = 'normal'
resolution = 'duplicate'
stage = 'resolved'
status = 'closed'
superseder = '13322'
type = 'behavior'
url = 'https://bugs.python.org/issue13858'
versions = ['Python 3.3']
    @anacrolix
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    anacrolix mannequin commented Jan 25, 2012

    _io._IOBase.readline doesn't seem to like _io.FileIO.read returning None, which occurs when it's unbuffered and nonblocking. (Modules/_io/fileio.c:745 in trunk). Can this be handled some other way?

    $ python3.3
Python 3.3.0a0 (default:fb0f4fe8123e+, Jan 24 2012, 11:21:36) 
[GCC 4.6.2] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import os, io
>>> r, w = os.pipe2(os.O_NONBLOCK)
>>> f = io.open(r, 'rb', 0)
>>> f.readline()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
OSError: read() should have returned a bytes object, not 'NoneType'

    @anacrolix anacrolix mannequin added stdlib Python modules in the Lib dir topic-IO type-bug An unexpected behavior, bug, or error labels Jan 25, 2012
    @neologix
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    Mannequin

    neologix mannequin commented Jan 25, 2012

    Can this be handled some other way?

    Yeah, that's an hairy issue.
    See bpo-13322 for the details.

    @neologix neologix mannequin closed this as completed Jan 25, 2012
    @ezio-melotti ezio-melotti transferred this issue from another repository Apr 10, 2022
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