[issue12977] socket.socket.setblocking does not raise exception if no data available

[Georg Brandl]

Georg Brandl ge...@python.org added the comment:

I think you're mistaking a closed connection with no data available.

Small demo that this works as intended:

 s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
 s.connect(('localhost', 1234))
 s.recv(10)
^CTraceback (most recent call last):
  File stdin, line 1, in module
KeyboardInterrupt
 s.setblocking(False)
 s.recv(10)
Traceback (most recent call last):
  File stdin, line 1, in module
socket.error: [Errno 11] Resource temporarily unavailable

The corresponding server:

 x = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
 x.bind(('', 1234))
 x.listen(1)
 x.accept()
(socket._socketobject object at 0x7f4211e997c0, ('127.0.0.1', 39146))

--
nosy: +georg.brandl
resolution:  - works for me
status: open - closed

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[issue12977] socket.socket.setblocking does not raise exception if no data available

[Florian Ludwig]

New submission from Florian Ludwig flor...@leijuna.de:

The documentation states:

 In non-blocking mode, if a recv() call doesn’t find any data, [...], a error 
 exception is raised; [0]

Which is wrong. If no data is available recv() does not raise an exception but 
returns an empty string.

[0] http://docs.python.org/library/socket.html#socket.socket.setblocking

--
assignee: docs@python
components: Documentation
messages: 144024
nosy: Florian.Ludwig, docs@python
priority: normal
severity: normal
status: open
title: socket.socket.setblocking does not raise exception if no data available
versions: Python 2.7

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