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Update wikipage Managing CTRL+C on console. (Signed-off-by:tioui).

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documentation/18.01/eiffel/Tutorials/Mini-HowTo/Managing-CTRL-C-on-console.wiki
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[[Property:weight|0]] [[Property:weight|0]]
[[Property:title|Managing CTRL+C on console]] [[Property:title|Managing CTRL+C on console]]
[[Property:link_title|CTRL_C terminal]] [[Property:link_title|CTRL_C terminal]]
Normally, if the user use 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> mecanism to cancel the exception handeling done by the Eiffel runtime. Normally, if the user use 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> mecanism to cancel the exception handeling 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>.
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