[issue39685] Python 3.8 regression Socket operation on non-socket

[hillpd]

hillpd <hillpd at gmail.com> added the comment:

Blocking the use of stdin/stdout like this looks intentional. I have added dimaqq and asvetlov for comment.

The python docs [0] indicate that the file descriptor should be a socket:
"The file descriptor should refer to a socket, but this is not checked — subsequent operations on the object may fail if the file descriptor is invalid."

With bpo-35415, the fd is explicitly checked.

[0] https://docs.python.org/3/library/socket.html#socket.fromfd

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nosy: +Dima.Tisnek, asvetlov, hillpd

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