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This is an experimental SAK filter that uses evdev and friends to:
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1.) Signal when a SAK (currently hardcoded as Ctrl+Alt+DEL) is pressed
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This signal is ONLY available to applications running as root
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2.) Filter any SAK press events out, so that no non-root applications are aware of them if they occur.
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In fact, even root applications will be unaware of the SAK press unless they are monitoring
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the out-of-band SAK interface.
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The interface is very simple. Listen on /tmp/tdesocket-global/tsak and you will receive the null-terminated string "SAK\n\r" when the SAK is pressed.
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Note that the string may be sent multiple times, especially if the SAK is held down.
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