Isn't closing fd at the end makes all the work meaningless?
$ man login_tty| grep -A6 'The login_tty() '
The login_tty() function prepares for a login on the tty fd
(which may be a real tty device, or the slave of a pseudoter-
minal as returned by openpty()) by creating a new session,
making fd the controlling terminal for the calling process,
setting fd to be the standard input, output, and error streams
of the current process, and closing fd.
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