Function: resume-tty

Resume the previously suspended terminal device TTY.
The terminal is opened and reinitialized. Frames that are on the
suspended terminal are revived.

It is an error to resume a terminal while another terminal is active
on the same device.

This function runs `resume-tty-functions' after resuming the terminal.
The functions are run with one arg, the id of the resumed terminal

`resume-tty' does nothing if it is called on a device that is not

TTY may be a terminal object, a frame, or nil (meaning the selected frame's terminal). (fn &optional TTY)