different behaviour in copying a socket file in a directory

[chuvke]

When trying to copy directory that contains a file of type socket , I noticed a different behavior between gnu cp and uu-cp.

.
└── test
    └── some.socket

Created by: python -c "import socket as s; sock = s.socket(s.AF_UNIX); sock.bind('test/some.socket')"

➜ cp -r test test_cp

➜ uu-cp -r test test_uu-cp
uu-cp: 'full path../tmp/coreutils/test/some.socket' -> 'test_uu-cp/some.socket': No such device or address (os error 6)

➜ cp --version
cp (GNU coreutils) 9.7
Copyright (C) 2025 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later https://gnu.org/licenses/gpl.html.
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.

Written by Torbjörn Granlund, David MacKenzie, and Jim Meyering.

➜ uu-cp --version
uu-cp (uutils coreutils) 0.1.0

Difference: cp gives no output and copies the file, uu-cp doesn't copy the file and gives an error