[[Property:modification_date|Wed, 17 Apr 2019 14:06:41 GMT]]
[[Property:publication_date|Wed, 17 Apr 2019 14:02:25 GMT]]
[[Property:uuid|5CA34C5D-30F1-4D6F-9FE4-B555E541EA8C]]
[[Property:weight|4000]]
[[Property:title|Managing CTRL+C in console application]]
Normally, if the user uses the CTRL+C keys, the Eiffel application detect it as an error and throw an exception of type  <code>OPERATING_SYSTEM_SIGNAL_FAILURE</code>.

To manage the CTRL+C keys, you can use a <code>rescue</code> clause to detect the exception and a <code>retry</code> mechanism to cancel the exception handling done by the Eiffel runtime.

To detect the exception, you can <code>inherit</code> from the <code>EXCEPTIONS</code> class and use an attachment test on <code>Exception_manager.last_exception</code>.

Note that this code does not work on Windows. If used on Windows, the application will quit, but the <code>rescue</code> call is not launched.

<code>
note
	description: "Show how to quit an application using CTRL+C (without trace)."
	author: "Louis Marchand"
	date: "Wed, 25 Apr 2018 23:12:33 +0000"
	revision: "0.1"

class
	APPLICATION

inherit
	EXCEPTIONS

create
	make

feature {NONE} -- Initialization

	make
			-- Launch `Current'.
		local
			l_ctrl_c:BOOLEAN
		do
			if not l_ctrl_c then
				from until False loop
					io.standard_default.put_string ("Press CTRL+C%N")
					io.input.read_line
				end
			else
				io.standard_default.put_string ("%NClosing...%N")
			end
		rescue
			if attached {OPERATING_SYSTEM_SIGNAL_FAILURE} 
							Exception_manager.last_exception then
				l_ctrl_c := True
				retry
			end
		end

end
</code>