For example, in input.h
, KEY_D
is equal to 32. On a QWERTY keyboard, D is the third "printable" key from left on home row. On a DVORAK keyboard, the same key is marked E. So, if I press E on a DVORAK keyboard, will I get KEY_D
(32) or KEY_E
(18)?
Are linux/input.h keycodes layout independent?
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You will get
KEY_D
. These values are abstraction of keys as they are placed on a typical physical keyboard (see ISO 9995), after abstracting from all interface details (see e.g. three PC scancode sets and other mesh). But this does not take alternative layouts into account yet, neither national layouts like AZERTY nor special ones like Dvorak. They are implemented on the next layer, where independent keycodes are affected by modifiers and translated to resulting strings and events.The USB "HID usage tables" document explicitly says:
so, if even your keyboard is initially Dvorak, you will get
KEY_D
. You can treat it as "generic"KEY_C03
(see again ISO9995 key names), if this satisfies (most XKB layout sources use this notation).