Why `exec 3<>/dev/tcp/www.google.com/80` terminates the terminal on macOS?

[Peng Yu]

Hi,

https://www.linuxjournal.com/content/more-using-bashs-built-devtcp-file-tcpip

I am trying the following command. But the terminal gets terminated on
macOS but not on Linux. Does anybody know what is wrong?

exec 3<>/dev/tcp/www.google.com/80

$ bash --version
GNU bash, version 5.1.4(1)-release (x86_64-apple-darwin19.6.0)
Copyright (C) 2020 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://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.

$ bash --version
GNU bash, version 5.1.0(2)-rc2 (x86_64-pc-linux-gnu)
Copyright (C) 2020 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://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.

-- 
Regards,
Peng