New submission from George,Y:

I need to know the IP address on the other side of a broken TCP/IP connection. 

"socket.getpeername()" fails to do the job sometimes because the connection has 
been closed, and Windows Error 10038 tells the connection is no longer a socket 
so that the method getpeername is wrongly used.

Here goes the code in main thread:
mailbox = queue.Queue()

read_sockets, write_sockets, error_sockets =,[],[],TIMEOUT)
for sock in read_sockets:
        mailbox.put( (("sock_err",sock), 'localhost') )

The sub thread get this message from mailbox and try to analyze the broken 
socket, to simplify I put the code and output together:

<socket.socket [closed] fd=-1, family=AFNET, type=SOCKSTREAM, proto=0>
OS.Error[WinError10038]an operation was attempted on something that is not a 

Surprisingly,  this kind of error happen occasionally - sometimes the socket 
object is normal and getpeername() works fine.

So once a connection is broken, there is no way to tell the address to whom it 

components: Library (Lib)
files: socket错误不识别.png
messages: 278679
nosy: George,Y
priority: normal
severity: normal
status: open
title: socket.getpeername() failure on broken TCP/IP connection
type: crash
versions: Python 3.4
Added file:错误不识别.png

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