const golang.org/x/sys/unix.TIOCVHANGUP

one use

	golang.org/x/sys/unix (current package)
		zerrors_linux_amd64.go#L447: 	TIOCVHANGUP                      = 0x5437

The pages are generated with Golds v0.4.9. (GOOS=linux GOARCH=amd64)