The emacs behavior is because emacs specifically disables several
terminal escapes, such as flow control and keyboard interupt. To
demonstrate, open two terminals. Terminal A will be used to run emacs in
console mode. Before running emacs, run the "tty" command in Terminal A,
and then use that value (for example, "/dev/pts/0" in a stty command in
Terminal B: "stty -a < /dev/pts/0". Then run "emacs -nw" in Terminal A,
and run the same stty command again in Terminal B; you'll note that
emacs has changed the terminal setup, including disabling of flow
control. This makes a good deal of sense, since (a) flow control seems
much less useful in a windowed program like Emacs, and (b) Emacs needs
the control sequences for its own purposes. :)

-- 
Please disable flow-control by default
https://bugs.launchpad.net/bugs/80635
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