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socket.recv() blocks while it's gettimeout() returns 0.0 #69657

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animus mannequin opened this issue Oct 24, 2015 · 3 comments
Closed

socket.recv() blocks while it's gettimeout() returns 0.0 #69657

animus mannequin opened this issue Oct 24, 2015 · 3 comments

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@animus
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Mannequin

animus mannequin commented Oct 24, 2015

BPO 25471
Files
  • s1.py
    		•

    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 2015-10-25.03:07:43.034>
created_at = <Date 2015-10-24.23:03:29.910>
labels = []
title = "socket.recv() blocks while it's gettimeout() returns 0.0"
updated_at = <Date 2015-10-25.03:07:43.006>
user = 'https://bugs.python.org/animus'

    bugs.python.org fields:

    activity = <Date 2015-10-25.03:07:43.006>
actor = 'python-dev'
assignee = 'none'
closed = True
closed_date = <Date 2015-10-25.03:07:43.034>
closer = 'python-dev'
components = []
creation = <Date 2015-10-24.23:03:29.910>
creator = 'animus'
dependencies = []
files = ['40856']
hgrepos = []
issue_num = 25471
keywords = []
message_count = 3.0
messages = ['253418', '253419', '253420']
nosy_count = 2.0
nosy_names = ['python-dev', 'animus']
pr_nums = []
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue25471'
versions = ['Python 2.7', 'Python 3.5']
    @animus
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    Mannequin Author

    animus mannequin commented Oct 24, 2015

    socket created with listening socket set to setblocking(False). gettimeout() of accept()-returned socket returns 0.0 , but recv() method blocks while client is connected and not sending any data. If client disconnects, socket returned by accept() starting return 0-length bytes string without blocking.

    glibc doc on recv():
    ---
    If nonblocking mode is set for SOCKET, and no data are available to be read, 'recv' fails immediately rather than waiting.
    ---

    testing server and client code attached.

    tested with Python 3.5.0 and Python 2.7.10

    @animus
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    animus mannequin commented Oct 24, 2015

    telnet 127.0.0.1 9000 can be used as testing client

    @python-dev
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    python-dev mannequin commented Oct 25, 2015

    New changeset 10e044a734f3 by Benjamin Peterson in branch '3.4':
    accepted sockets shouldn't inherit the SOCK_NONBLOCK flag (closes bpo-25471)
    https://hg.python.org/cpython/rev/10e044a734f3

    New changeset 7577960ea17b by Benjamin Peterson in branch '3.5':
    merge 3.4 (bpo-25471)
    https://hg.python.org/cpython/rev/7577960ea17b

    New changeset 347221cfa224 by Benjamin Peterson in branch 'default':
    merge 3.5 (bpo-25471)
    https://hg.python.org/cpython/rev/347221cfa224

    @python-dev python-dev mannequin closed this as completed Oct 25, 2015
    @ezio-melotti ezio-melotti transferred this issue from another repository Apr 10, 2022
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