![]() The kernel itself is unaware of the user-level concept of "event". This relies on the process separation enforced by the kernel: normal user process cannot fiddle at will with the memory allocated for a root process. Try it ! Run Terminal.app, enable the "Keyboard Viewer", and see that enabling "Secure Keyboard Entry" prevents the Keyboard Viewer from doing its job.Īll these event routing is done in some user-space process which runs as root. EnableSecureEventInput blocks this feature for the application which calls it. This is a feature: it allows things like "password wallets" (which enter a password as if it was typed by the user, from the point of view of the application) or the "Keyboard Viewer" (the GUI-based keyboard which allows you to "type" characters with the mouse and also shows what keys are actually being pressed at any time). Some elements in the OS decides what application gets what events, depending on its access rights and GUI state (there are details depending on which application is "in the foreground").Īpplications can "spy" on each other, meaning (in this case) that an application running on the machine can ask to the OS to send it a copy of all key strokes even if they are meant for another application, and/or to inject synthetic events of its own. about key strokes) from the operating system. Basically, applications don't access the hardware themselves they obtain events (e.g. ![]() "Secure Keyboard Entry" maps to the EnableSecureEventInput function whose concept is described here.
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