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socket_connected(3) on Linux

The text 634301cca7ea, as Debian 11 (Bullseye), Debian 10 (Buster), Debian 9 (Stretch), Debian 8 (Jessie), Debian 7 (Wheezy), Debian 3.0 (Woody) shipped it.

is a connection established on a socket?

socket_connected(3) on Linux now