Martin Panter added the comment:

Socket objects aren’t exactly file-like. Plain non-SSL sockets don’t even have 
read() methods.

I think giving a meaning to recv(-1) would be an (unwanted) new feature, rather 
than a bug fix. If you want a file-like object linked to a socket, I would 
suggest using something like the makefile() method instead of adding to the 
low-level socket object API.

But to answer your question: no, most file methods treat a negative size as a 
special request to read until EOF, e.g. read(-1), readline(-1) and 
readlines(-1) of RawIOBase, BufferedIOBase and TextIOBase. On the other hand, 
BufferedIOBase.read1(-1) is poorly defined and supported (Issue 23214), but may 
end up meaning something like “read an arbitrary non-zero chunk with a minimum 
amount of low-level calls and processing”.

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue26644>
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