To prevent wl_keyboard keymap being written to by clients, use a unique
file descriptor for each wl_keyboard resource.
Reference: weston, commit 76829fc4eaea329d2a525c3978271e13bd76c078
wlr_keyboard manages the xkb-common state of the compositor.
It used to update the state, update the modifiers, then notify the
compositor.
When [Shift_L] was pressed and released, this resulted in an event chain:
Modifiers: Shift
Key: Shift_L (Pressed)
Modifiers:
Key: Shift_L (Release)
The xkb-docs state that the state should be updated *after* the key was
handled [1], to prevent the new state from influencing the actual key
generated.
To achieve this, the event to the compositor is emitted, *before*
wlroots handles the xkb and internal keyboard state.
With this patch applied, the emitted events ill be:
Modifiers:
Key: Shift_L (Pressed)
Modifiers: Shift
Key: Shift_L (Release)
[1] https://xkbcommon.org/doc/current/group__state.html#gac554aa20743a621692c1a744a05e06ce
keymap_size is a size_t. Otherwise the build fails on arm like
../types/wlr_keyboard.c: In function 'wlr_keyboard_set_keymap':
../include/wlr/util/log.h:34:17: error: format '%lu' expects argument of type 'long unsigned int', but argument 5 has type 'size_t {aka unsigned int}' [-Werror=format=]
_wlr_log(verb, "[%s:%d] " fmt, _strip_path(__FILE__), __LINE__, ##__VA_ARGS__)
^
../types/wlr_keyboard.c:218:3: note: in expansion of macro 'wlr_log'
wlr_log(L_ERROR, "creating a keymap file for %lu bytes failed", kb->keymap_size);
^~~~~~~
../types/wlr_keyboard.c:218:50: note: format string is defined here
wlr_log(L_ERROR, "creating a keymap file for %lu bytes failed", kb->keymap_size);
~~^
%u
A structs throughout the code use implementation specific free
functions.
When those functions are not used, they simply call free() on their
data, but this leaves around wl_signals linked into listeners.
When those listeners try to remove themself from the list, they write
into the now free memory.
This commit adds calls to remove the signals from those lists, so the
listeners can safely call wl_list_remove
