Merge pull request #184 from emersion/rootston-keys

Keyboard modifiers

include/rootston/config.h

@@ -18,6 +18,14 @@ struct device_config {
 	struct wl_list link;
 };
 
+struct binding_config {
+	uint32_t modifiers;
+	xkb_keysym_t *keysyms;
+	size_t keysyms_len;
+	char *command;
+	struct wl_list link;
+};
+
 struct roots_config {
 	// TODO: Multiple cursors, multiseat
 	struct {
@@ -27,6 +35,7 @@ struct roots_config {
 
 	struct wl_list outputs;
 	struct wl_list devices;
+	struct wl_list bindings;
 	char *config_path;
 };
 

include/rootston/input.h

@@ -10,11 +10,15 @@
 #include "rootston/view.h"
 #include "rootston/server.h"
 
+#define ROOTS_KEYBOARD_PRESSED_KEYSYMS_CAP 32
+
 struct roots_keyboard {
 	struct roots_input *input;
 	struct wlr_input_device *device;
 	struct wl_listener key;
 	struct wl_list link;
+
+	xkb_keysym_t pressed_keysyms[ROOTS_KEYBOARD_PRESSED_KEYSYMS_CAP];
 };
 
 struct roots_pointer {

include/wlr/types/wlr_keyboard.h

@@ -6,11 +6,25 @@
 #include <wayland-server.h>
 #include <xkbcommon/xkbcommon.h>
 
-enum WLR_KEYBOARD_LED {
+#define WLR_LED_COUNT 3
+
+enum wlr_keyboard_led {
 	WLR_LED_NUM_LOCK = 1,
 	WLR_LED_CAPS_LOCK = 2,
 	WLR_LED_SCROLL_LOCK = 4,
-	WLR_LED_LAST
+};
+
+#define WLR_MODIFIER_COUNT 8
+
+enum wlr_keyboard_modifier {
+	WLR_MODIFIER_SHIFT = 1,
+	WLR_MODIFIER_CAPS = 2,
+	WLR_MODIFIER_CTRL = 4,
+	WLR_MODIFIER_ALT = 8,
+	WLR_MODIFIER_MOD2 = 16,
+	WLR_MODIFIER_MOD3 = 32,
+	WLR_MODIFIER_LOGO = 64,
+	WLR_MODIFIER_MOD5 = 128,
 };
 
 struct wlr_keyboard_impl;
@@ -23,18 +37,25 @@ struct wlr_keyboard {
 	size_t keymap_size;
 	struct xkb_keymap *keymap;
 	struct xkb_state *xkb_state;
-	xkb_led_index_t leds[WLR_LED_LAST];
+	xkb_led_index_t led_indexes[WLR_LED_COUNT];
+	xkb_mod_index_t mod_indexes[WLR_MODIFIER_COUNT];
+
+	struct {
+		xkb_mod_mask_t depressed;
+		xkb_mod_mask_t latched;
+		xkb_mod_mask_t locked;
+		xkb_mod_mask_t group;
+	} modifiers;
 
 	struct {
 		struct wl_signal key;
+		struct wl_signal modifiers;
 		struct wl_signal keymap;
 	} events;
 
 	void *data;
 };
 
-void wlr_keyboard_led_update(struct wlr_keyboard *keyboard, uint32_t leds);
-
 enum wlr_key_state {
 	WLR_KEY_RELEASED,
 	WLR_KEY_PRESSED,
@@ -49,5 +70,7 @@ struct wlr_event_keyboard_key {
 
 void wlr_keyboard_set_keymap(struct wlr_keyboard *kb,
 	struct xkb_keymap *keymap);
+void wlr_keyboard_led_update(struct wlr_keyboard *keyboard, uint32_t leds);
+uint32_t wlr_keyboard_get_modifiers(struct wlr_keyboard *keyboard);
 
 #endif

include/wlr/types/wlr_seat.h

@@ -37,6 +37,7 @@ struct wlr_seat_keyboard {
 	struct wlr_seat *seat;
 	struct wlr_keyboard *keyboard;
 	struct wl_listener key;
+	struct wl_listener modifiers;
 	struct wl_listener keymap;
 	struct wl_listener destroy;
 	struct wl_list link;

rootston/config.c

@@ -171,6 +171,59 @@ static int config_ini_handler(void *user, const char *section, const char *name,
 		} else {
 			wlr_log(L_ERROR, "got unknown device config: %s", name);
 		}
+	} else if (strcmp(section, "bindings") == 0) {
+		struct binding_config *bc = calloc(1, sizeof(struct binding_config));
+		wl_list_insert(&config->bindings, &bc->link);
+
+		bc->command = strdup(value);
+
+		size_t keysyms_len = 1;
+		char *symnames = strdup(name);
+		for (char *c = symnames; *c != '\0'; c++) {
+			if (*c == '+') {
+				*c = '\0';
+				keysyms_len++;
+			}
+		}
+
+		// TODO: bc->keysyms is larger than needed
+		bc->keysyms = calloc(1, keysyms_len * sizeof(xkb_keysym_t));
+		char *symname = symnames;
+		for (size_t i = 0; i < keysyms_len; i++) {
+			if (strcmp(symname, "Shift") == 0) {
+				bc->modifiers |= WLR_MODIFIER_SHIFT;
+			} else if (strcmp(symname, "Caps") == 0) {
+				bc->modifiers |= WLR_MODIFIER_CAPS;
+			} else if (strcmp(symname, "Ctrl") == 0) {
+				bc->modifiers |= WLR_MODIFIER_CTRL;
+			} else if (strcmp(symname, "Alt") == 0) {
+				bc->modifiers |= WLR_MODIFIER_ALT;
+			} else if (strcmp(symname, "Mod2") == 0) {
+				bc->modifiers |= WLR_MODIFIER_MOD2;
+			} else if (strcmp(symname, "Mod3") == 0) {
+				bc->modifiers |= WLR_MODIFIER_MOD3;
+			} else if (strcmp(symname, "Logo") == 0) {
+				bc->modifiers |= WLR_MODIFIER_LOGO;
+			} else if (strcmp(symname, "Mod5") == 0) {
+				bc->modifiers |= WLR_MODIFIER_MOD5;
+			} else {
+				xkb_keysym_t sym = xkb_keysym_from_name(symname,
+					XKB_KEYSYM_NO_FLAGS);
+				if (sym == XKB_KEY_NoSymbol) {
+					wlr_log(L_ERROR, "got unknown key binding symbol: %s",
+						symname);
+					wl_list_remove(&bc->link);
+					free(bc->keysyms);
+					free(bc);
+					break;
+				}
+				bc->keysyms[bc->keysyms_len] = sym;
+				bc->keysyms_len++;
+			}
+			symname += strlen(symname) + 1;
+		}
+
+		free(symnames);
 	} else {
 		wlr_log(L_ERROR, "got unknown config section: %s", section);
 	}
@@ -182,6 +235,7 @@ struct roots_config *parse_args(int argc, char *argv[]) {
 	struct roots_config *config = calloc(1, sizeof(struct roots_config));
 	wl_list_init(&config->outputs);
 	wl_list_init(&config->devices);
+	wl_list_init(&config->bindings);
 
 	int c;
 	while ((c = getopt(argc, argv, "C:h")) != -1) {
@@ -212,6 +266,15 @@ struct roots_config *parse_args(int argc, char *argv[]) {
 
 	if (result == -1) {
 		wlr_log(L_DEBUG, "No config file found. Using empty config.");
+
+		struct binding_config *bc = calloc(1, sizeof(struct binding_config));
+		wl_list_insert(&config->bindings, &bc->link);
+		bc->command = strdup("exit");
+		bc->modifiers = WLR_MODIFIER_LOGO;
+		bc->keysyms_len = 2;
+		bc->keysyms = calloc(1, bc->keysyms_len * sizeof(xkb_keysym_t));
+		bc->keysyms[0] = XKB_KEY_Meta_L;
+		bc->keysyms[1] = XKB_KEY_q;
 	} else if (result == -2) {
 		wlr_log(L_ERROR, "Could not allocate memory to parse config file");
 		exit(1);
@@ -238,6 +301,13 @@ void roots_config_destroy(struct roots_config *config) {
 		free(dc);
 	}
 
+	struct binding_config *bc, *btmp = NULL;
+	wl_list_for_each_safe(bc, btmp, &config->bindings, link) {
+		free(bc->keysyms);
+		free(bc->command);
+		free(bc);
+	}
+
 	free(config->config_path);
 	free(config->cursor.mapped_output);
 	free(config->cursor.mapped_box);

rootston/keyboard.c

@@ -1,6 +1,7 @@
 #include <assert.h>
 #include <stdint.h>
 #include <stdlib.h>
+#include <unistd.h>
 #include <wayland-server.h>
 #include <wlr/types/wlr_input_device.h>
 #include <wlr/types/wlr_pointer.h>
@@ -10,32 +11,100 @@
 #include <xkbcommon/xkbcommon.h>
 #include "rootston/input.h"
 
-static void keyboard_key_notify(struct wl_listener *listener, void *data) {
+static ssize_t keyboard_pressed_keysym_index(struct roots_keyboard *keyboard,
-	struct wlr_event_keyboard_key *event = data;
+		xkb_keysym_t keysym) {
-	struct roots_keyboard *keyboard = wl_container_of(listener, keyboard, key);
+	for (size_t i = 0; i < ROOTS_KEYBOARD_PRESSED_KEYSYMS_CAP; i++) {
-	struct roots_input *input = keyboard->input;
+		if (keyboard->pressed_keysyms[i] == keysym) {
-	struct roots_server *server = input->server;
+			return i;
+		}
+	}
+	return -1;
+}
 
-	enum wlr_key_state key_state = event->state;
+static void keyboard_binding_execute(struct roots_keyboard *keyboard,
-	uint32_t keycode = event->keycode + 8;
+		char *command) {
-	const xkb_keysym_t *syms;
+	struct roots_server *server = keyboard->input->server;
-	int nsyms = xkb_state_key_get_syms(keyboard->device->keyboard->xkb_state,
+	if (strcmp(command, "exit") == 0) {
-			keycode, &syms);
-	for (int i = 0; i < nsyms; ++i) {
-		xkb_keysym_t sym = syms[i];
-		if (sym == XKB_KEY_Escape) {
-			// TEMPORARY, probably
 		wl_display_terminate(server->wl_display);
-		} else if (key_state == WLR_KEY_PRESSED &&
+	} else {
-				sym >= XKB_KEY_XF86Switch_VT_1 &&
+		pid_t pid = fork();
-				sym <= XKB_KEY_XF86Switch_VT_12) {
+		if (pid < 0) {
+			wlr_log(L_ERROR, "cannot execute binding command: fork() failed");
+			return;
+		} else if (pid == 0) {
+			execl("/bin/sh", "/bin/sh", "-c", command, (void *)NULL);
+		}
+	}
+}
+
+static void keyboard_keysym_press(struct roots_keyboard *keyboard,
+		xkb_keysym_t keysym) {
+	ssize_t i = keyboard_pressed_keysym_index(keyboard, keysym);
+	if (i < 0) {
+		i = keyboard_pressed_keysym_index(keyboard, XKB_KEY_NoSymbol);
+		if (i >= 0) {
+			keyboard->pressed_keysyms[i] = keysym;
+		}
+	}
+
+	if (keysym >= XKB_KEY_XF86Switch_VT_1 &&
+			keysym <= XKB_KEY_XF86Switch_VT_12) {
+		struct roots_server *server = keyboard->input->server;
 		if (wlr_backend_is_multi(server->backend)) {
 			struct wlr_session *session =
 				wlr_multi_get_session(server->backend);
 			if (session) {
-					wlr_session_change_vt(session, sym - XKB_KEY_XF86Switch_VT_1 + 1);
+				unsigned vt = keysym - XKB_KEY_XF86Switch_VT_1 + 1;
+				wlr_session_change_vt(session, vt);
 			}
 		}
+		return;
+	}
+
+	uint32_t modifiers = wlr_keyboard_get_modifiers(keyboard->device->keyboard);
+	struct wl_list *bindings = &keyboard->input->server->config->bindings;
+	struct binding_config *bc;
+	wl_list_for_each(bc, bindings, link) {
+		if (modifiers ^ bc->modifiers) {
+			continue;
+		}
+
+		bool ok = true;
+		for (size_t i = 0; i < bc->keysyms_len; i++) {
+			ssize_t j = keyboard_pressed_keysym_index(keyboard, bc->keysyms[i]);
+			if (j < 0) {
+				ok = false;
+				break;
+			}
+		}
+
+		if (ok) {
+			keyboard_binding_execute(keyboard, bc->command);
+		}
+	}
+}
+
+static void keyboard_keysym_release(struct roots_keyboard *keyboard,
+		xkb_keysym_t keysym) {
+	ssize_t i = keyboard_pressed_keysym_index(keyboard, keysym);
+	if (i >= 0) {
+		keyboard->pressed_keysyms[i] = XKB_KEY_NoSymbol;
+	}
+}
+
+static void keyboard_key_notify(struct wl_listener *listener, void *data) {
+	struct wlr_event_keyboard_key *event = data;
+	struct roots_keyboard *keyboard = wl_container_of(listener, keyboard, key);
+
+	uint32_t keycode = event->keycode + 8;
+	const xkb_keysym_t *syms;
+	int syms_len = xkb_state_key_get_syms(keyboard->device->keyboard->xkb_state,
+		keycode, &syms);
+	for (int i = 0; i < syms_len; i++) {
+		if (event->state == WLR_KEY_PRESSED) {
+			keyboard_keysym_press(keyboard, syms[i]);
+		} else { // WLR_KEY_RELEASED
+			keyboard_keysym_release(keyboard, syms[i]);
 		}
 	}
 }

rootston/main.c

@@ -41,6 +41,7 @@ int main(int argc, char **argv) {
 		return 1;
 	}
 
+	setenv("WAYLAND_DISPLAY", socket, true);
 	wl_display_run(server.wl_display);
 	return 0;
 }

rootston/rootston.ini.example

@@ -24,3 +24,9 @@ geometry = 2500x800
 map-to-output = VGA-1
 # Restrict cursor movements for this mouse to concrete rectangle
 geometry = 2500x800
+
+# Keybindings
+# Maps key combinations with commands to execute
+# The special command "exit" stops the compositor
+[bindings]
+Logo+q=exit

types/wlr_keyboard.c

@@ -12,20 +12,46 @@ int os_create_anonymous_file(off_t size);
 
 static void keyboard_led_update(struct wlr_keyboard *keyboard) {
 	uint32_t leds = 0;
-	for (uint32_t i = 0; i < WLR_LED_LAST; ++i) {
+	for (uint32_t i = 0; i < WLR_LED_COUNT; ++i) {
-		if (xkb_state_led_index_is_active(keyboard->xkb_state, keyboard->leds[i])) {
+		if (xkb_state_led_index_is_active(keyboard->xkb_state,
+				keyboard->led_indexes[i])) {
 			leds |= (1 << i);
 		}
 	}
 	wlr_keyboard_led_update(keyboard, leds);
 }
 
+static void keyboard_modifier_update(struct wlr_keyboard *keyboard) {
+	xkb_mod_mask_t depressed = xkb_state_serialize_mods(keyboard->xkb_state,
+		XKB_STATE_MODS_DEPRESSED);
+	xkb_mod_mask_t latched = xkb_state_serialize_mods(keyboard->xkb_state,
+		XKB_STATE_MODS_LATCHED);
+	xkb_mod_mask_t locked = xkb_state_serialize_mods(keyboard->xkb_state,
+		XKB_STATE_MODS_LOCKED);
+	xkb_mod_mask_t group = xkb_state_serialize_layout(keyboard->xkb_state,
+		XKB_STATE_LAYOUT_EFFECTIVE);
+	if (depressed == keyboard->modifiers.depressed &&
+			latched == keyboard->modifiers.latched &&
+			locked == keyboard->modifiers.locked &&
+			group == keyboard->modifiers.group) {
+		return;
+	}
+
+	keyboard->modifiers.depressed = depressed;
+	keyboard->modifiers.latched = latched;
+	keyboard->modifiers.locked = locked;
+	keyboard->modifiers.group = group;
+
+	wl_signal_emit(&keyboard->events.modifiers, keyboard);
+}
+
 void wlr_keyboard_update_state(struct wlr_keyboard *keyboard,
 		struct wlr_event_keyboard_key *event) {
 	uint32_t keycode = event->keycode + 8;
 	xkb_state_update_key(keyboard->xkb_state, keycode,
 		event->state == WLR_KEY_PRESSED ? XKB_KEY_DOWN : XKB_KEY_UP);
 	keyboard_led_update(keyboard);
+	keyboard_modifier_update(keyboard);
 	wl_signal_emit(&keyboard->events.key, event);
 }
 
@@ -33,6 +59,7 @@ void wlr_keyboard_init(struct wlr_keyboard *kb,
 		struct wlr_keyboard_impl *impl) {
 	kb->impl = impl;
 	wl_signal_init(&kb->events.key);
+	wl_signal_init(&kb->events.modifiers);
 	wl_signal_init(&kb->events.keymap);
 }
 
@@ -59,14 +86,31 @@ void wlr_keyboard_set_keymap(struct wlr_keyboard *kb,
 	wlr_log(L_DEBUG, "Keymap set");
 	kb->keymap = keymap;
 	assert(kb->xkb_state = xkb_state_new(kb->keymap));
-	const char *led_names[3] = {
+
+	const char *led_names[WLR_LED_COUNT] = {
 		XKB_LED_NAME_NUM,
 		XKB_LED_NAME_CAPS,
-		XKB_LED_NAME_SCROLL
+		XKB_LED_NAME_SCROLL,
 	};
-	for (uint32_t i = 0; i < 3; ++i) {
+	for (size_t i = 0; i < WLR_LED_COUNT; ++i) {
-		kb->leds[i] = xkb_map_led_get_index(kb->keymap, led_names[i]);
+		kb->led_indexes[i] = xkb_map_led_get_index(kb->keymap, led_names[i]);
 	}
+
+	const char *mod_names[WLR_MODIFIER_COUNT] = {
+		XKB_MOD_NAME_SHIFT,
+		XKB_MOD_NAME_CAPS,
+		XKB_MOD_NAME_CTRL, // "Control"
+		XKB_MOD_NAME_ALT, // "Mod1"
+		XKB_MOD_NAME_NUM, // "Mod2"
+		"Mod3",
+		XKB_MOD_NAME_LOGO, // "Mod4"
+		"Mod5",
+	};
+	// TODO: there's also "Ctrl", "Alt"?
+	for (size_t i = 0; i < WLR_MODIFIER_COUNT; ++i) {
+		kb->mod_indexes[i] = xkb_map_mod_get_index(kb->keymap, mod_names[i]);
+	}
+
 	char *keymap_str = xkb_keymap_get_as_string(kb->keymap,
 		XKB_KEYMAP_FORMAT_TEXT_V1);
 	kb->keymap_size = strlen(keymap_str) + 1;
@@ -75,5 +119,18 @@ void wlr_keyboard_set_keymap(struct wlr_keyboard *kb,
 		PROT_READ | PROT_WRITE, MAP_SHARED, kb->keymap_fd, 0);
 	strcpy(ptr, keymap_str);
 	free(keymap_str);
+
 	wl_signal_emit(&kb->events.keymap, kb);
 }
+
+uint32_t wlr_keyboard_get_modifiers(struct wlr_keyboard *kb) {
+	xkb_mod_mask_t mask = kb->modifiers.depressed | kb->modifiers.latched;
+	uint32_t modifiers = 0;
+	for (size_t i = 0; i < WLR_MODIFIER_COUNT; ++i) {
+		if (kb->mod_indexes[i] != XKB_MOD_INVALID &&
+				(mask & (1 << kb->mod_indexes[i]))) {
+			modifiers |= (1 << i);
+		}
+	}
+	return modifiers;
+}

types/wlr_seat.c

@@ -376,23 +376,16 @@ void wlr_seat_pointer_send_axis(struct wlr_seat *wlr_seat, uint32_t time,
 	wl_pointer_send_frame(pointer);
 }
 
-static void keyboard_key_notify(struct wl_listener *listener, void *data) {
+static void keyboard_switch_seat_keyboard(struct wlr_seat_handle *handle,
-	struct wlr_seat_keyboard *seat_kb = wl_container_of(
+		struct wlr_seat_keyboard *seat_kb) {
-			listener, seat_kb, key);
+	if (handle->seat_keyboard == seat_kb) {
-	struct wlr_seat *seat = seat_kb->seat;
-	struct wlr_seat_handle *handle = seat->keyboard_state.focused_handle;
-	if (!handle || !handle->keyboard) {
 		return;
 	}
-	struct wlr_keyboard *keyboard = seat_kb->keyboard;
+
-	struct wlr_event_keyboard_key *event = data;
-	enum wlr_key_state key_state = event->state;
-	if (handle->seat_keyboard != seat_kb) {
 	// TODO: We should probably lift all of the keys set by the other
 	// keyboard
 	wl_keyboard_send_keymap(handle->keyboard,
-				WL_KEYBOARD_KEYMAP_FORMAT_XKB_V1,
+		WL_KEYBOARD_KEYMAP_FORMAT_XKB_V1, seat_kb->keyboard->keymap_fd,
-				seat_kb->keyboard->keymap_fd,
 		seat_kb->keyboard->keymap_size);
 
 	if (wl_resource_get_version(handle->keyboard) >= 2) {
@@ -402,23 +395,44 @@ static void keyboard_key_notify(struct wl_listener *listener, void *data) {
 	handle->seat_keyboard = seat_kb;
 }
 
-	uint32_t depressed = xkb_state_serialize_mods(keyboard->xkb_state,
+static void keyboard_key_notify(struct wl_listener *listener, void *data) {
-		XKB_STATE_MODS_DEPRESSED);
+	struct wlr_seat_keyboard *seat_kb = wl_container_of(listener, seat_kb, key);
-	uint32_t latched = xkb_state_serialize_mods(keyboard->xkb_state,
+	struct wlr_seat *seat = seat_kb->seat;
-		XKB_STATE_MODS_LATCHED);
+	struct wlr_seat_handle *handle = seat->keyboard_state.focused_handle;
-	uint32_t locked = xkb_state_serialize_mods(keyboard->xkb_state,
+	if (!handle || !handle->keyboard) {
-		XKB_STATE_MODS_LOCKED);
+		return;
-	uint32_t group = xkb_state_serialize_layout(keyboard->xkb_state,
+	}
-		XKB_STATE_LAYOUT_EFFECTIVE);
+
+	keyboard_switch_seat_keyboard(handle, seat_kb);
+
+	struct wlr_event_keyboard_key *event = data;
+	enum wlr_key_state key_state = event->state;
 
-	uint32_t modifiers_serial = wl_display_next_serial(seat->display);
 	uint32_t key_serial = wl_display_next_serial(seat->display);
-	wl_keyboard_send_modifiers(handle->keyboard, modifiers_serial,
-		depressed, latched, locked, group);
 	wl_keyboard_send_key(handle->keyboard, key_serial,
 		(uint32_t)event->time_usec, event->keycode, key_state);
 }
 
+static void keyboard_modifiers_notify(struct wl_listener *listener,
+		void *data) {
+	struct wlr_seat_keyboard *seat_kb = wl_container_of(listener, seat_kb,
+		modifiers);
+	struct wlr_seat *seat = seat_kb->seat;
+	struct wlr_seat_handle *handle = seat->keyboard_state.focused_handle;
+	if (!handle || !handle->keyboard) {
+		return;
+	}
+
+	keyboard_switch_seat_keyboard(handle, seat_kb);
+
+	struct wlr_keyboard *keyboard = seat_kb->keyboard;
+
+	uint32_t modifiers_serial = wl_display_next_serial(seat->display);
+	wl_keyboard_send_modifiers(handle->keyboard, modifiers_serial,
+		keyboard->modifiers.depressed, keyboard->modifiers.latched,
+		keyboard->modifiers.locked, keyboard->modifiers.group);
+}
+
 static void keyboard_keymap_notify(struct wl_listener *listener, void *data) {
 	struct wlr_seat_keyboard *seat_kb = wl_container_of(
 			listener, seat_kb, keymap);
@@ -442,6 +456,9 @@ void wlr_seat_attach_keyboard(struct wlr_seat *seat,
 	wl_list_init(&seat_kb->key.link);
 	seat_kb->key.notify = keyboard_key_notify;
 	wl_signal_add(&kb->events.key, &seat_kb->key);
+	wl_list_init(&seat_kb->modifiers.link);
+	seat_kb->modifiers.notify = keyboard_modifiers_notify;
+	wl_signal_add(&kb->events.modifiers, &seat_kb->modifiers);
 	wl_list_init(&seat_kb->keymap.link);
 	seat_kb->keymap.notify = keyboard_keymap_notify;
 	wl_signal_add(&kb->events.keymap, &seat_kb->keymap);
@@ -458,6 +475,7 @@ void wlr_seat_detach_keyboard(struct wlr_seat *seat, struct wlr_keyboard *kb) {
 		if (seat_kb->keyboard == kb) {
 			wl_list_remove(&seat_kb->link);
 			wl_list_remove(&seat_kb->key.link);
+			wl_list_remove(&seat_kb->modifiers.link);
 			wl_list_remove(&seat_kb->keymap.link);
 			wl_list_remove(&seat_kb->destroy.link);
 			free(seat_kb);