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explain_getdomainname_or_die(3) on Linux

The text 22b4c4c6b3d9, as Debian 13 (Trixie), Debian 12 (Bookworm), Debian 11 (Bullseye), Debian 10 (Buster), Debian 9 (Stretch) shipped it. The page shows this text now.

get domain name and report errors

explain_getdomainname_or_die(3) on Linux now