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Don't mute the console input if we can't read the keyboard 

This makes sure you can hit Ctrl-C if you don't have permission to access the raw keyboard device.

Fixes https://github.com/libsdl-org/SDL/issues/4812
This commit is contained in:
Sam Lantinga 2023-11-08 03:25:22 -08:00
parent 0a1b6b270f
commit ce9e1bd324
4 changed files with 69 additions and 20 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

34
src/core/linux/SDL_evdev.c
View File

@ -73,6 +73,7 @@ typedef struct SDL_evdevlist_item
{
char *path;
int fd;
int udev_class;
/* TODO: use this for every device, not just touchscreen */
SDL_bool out_of_sync;
@ -155,6 +156,15 @@ static int SDL_EVDEV_SetRelativeMouseMode(SDL_bool enabled)
return 0;
}
static void SDL_EVDEV_UpdateKeyboardMute(void)
{
if (SDL_EVDEV_GetDeviceCount(SDL_UDEV_DEVICE_KEYBOARD) > 0) {
SDL_EVDEV_kbd_set_muted(_this->kbd, SDL_TRUE);
} else {
SDL_EVDEV_kbd_set_muted(_this->kbd, SDL_FALSE);
}
}
int SDL_EVDEV_Init(void)
{
if (_this == NULL) {
@ -208,6 +218,8 @@ int SDL_EVDEV_Init(void)
#endif /* SDL_USE_LIBUDEV */
_this->kbd = SDL_EVDEV_kbd_init();
SDL_EVDEV_UpdateKeyboardMute();
}
SDL_GetMouse()->SetRelativeMouseMode = SDL_EVDEV_SetRelativeMouseMode;
@ -231,13 +243,13 @@ void SDL_EVDEV_Quit(void)
SDL_UDEV_Quit();
#endif /* SDL_USE_LIBUDEV */
SDL_EVDEV_kbd_quit(_this->kbd);
/* Remove existing devices */
while (_this->first != NULL) {
SDL_EVDEV_device_removed(_this->first->path);
}
SDL_EVDEV_kbd_quit(_this->kbd);
SDL_assert(_this->first == NULL);
SDL_assert(_this->last == NULL);
SDL_assert(_this->num_devices == 0);
@ -276,6 +288,19 @@ static void SDL_EVDEV_udev_callback(SDL_UDEV_deviceevent udev_event, int udev_cl
}
#endif /* SDL_USE_LIBUDEV */
int SDL_EVDEV_GetDeviceCount(int device_class)
{
SDL_evdevlist_item *item;
int count = 0;
for (item = _this->first; item != NULL; item = item->next) {
if ((item->udev_class & device_class) == device_class) {
++count;
}
}
return count;
}
void SDL_EVDEV_Poll(void)
{
struct input_event events[32];
@ -864,6 +889,8 @@ static int SDL_EVDEV_device_added(const char *dev_path, int udev_class)
return SDL_OutOfMemory();
}
item->udev_class = udev_class;
if (ioctl(item->fd, EVIOCGBIT(EV_REL, sizeof(relbit)), relbit) >= 0) {
item->relative_mouse = test_bit(REL_X, relbit) && test_bit(REL_Y, relbit);
item->high_res_wheel = test_bit(REL_WHEEL_HI_RES, relbit);
@ -900,6 +927,8 @@ static int SDL_EVDEV_device_added(const char *dev_path, int udev_class)
SDL_EVDEV_sync_device(item);
SDL_EVDEV_UpdateKeyboardMute();
return _this->num_devices++;
}
@ -926,6 +955,7 @@ static int SDL_EVDEV_device_removed(const char *dev_path)
close(item->fd);
SDL_free(item->path);
SDL_free(item);
SDL_EVDEV_UpdateKeyboardMute();
_this->num_devices--;
return 0;
}

1
src/core/linux/SDL_evdev.h
View File

@ -30,6 +30,7 @@ struct input_event;
extern int SDL_EVDEV_Init(void);
extern void SDL_EVDEV_Quit(void);
extern int SDL_EVDEV_GetDeviceCount(int device_class);
extern void SDL_EVDEV_Poll(void);
extern Uint64 SDL_EVDEV_GetEventTimestamp(struct input_event *event);

53
src/core/linux/SDL_evdev_kbd.c
View File

@ -84,6 +84,7 @@ static fn_handler_fn *fn_handler[] = {
struct SDL_EVDEV_keyboard_state
{
int console_fd;
SDL_bool muted;
int old_kbd_mode;
unsigned short **key_maps;
unsigned char shift_down[NR_SHIFT]; /* shift state counters.. */
@ -332,20 +333,6 @@ SDL_EVDEV_keyboard_state *SDL_EVDEV_kbd_init(void)
ioctl(kbd->console_fd, KDSKBMODE, K_UNICODE);
}
/* Allow inhibiting keyboard mute with env. variable for debugging etc. */
if (SDL_getenv("SDL_INPUT_LINUX_KEEP_KBD") == NULL) {
/* Mute the keyboard so keystrokes only generate evdev events
* and do not leak through to the console
*/
ioctl(kbd->console_fd, KDSKBMODE, K_OFF);
/* Make sure to restore keyboard if application fails to call
* SDL_Quit before exit or fatal signal is raised.
*/
if (!SDL_GetHintBoolean(SDL_HINT_NO_SIGNAL_HANDLERS, SDL_FALSE)) {
kbd_register_emerg_cleanup(kbd);
}
}
return kbd;
}
@ -355,12 +342,9 @@ void SDL_EVDEV_kbd_quit(SDL_EVDEV_keyboard_state *state)
return;
}
kbd_unregister_emerg_cleanup();
SDL_EVDEV_kbd_set_muted(state, SDL_FALSE);
if (state->console_fd >= 0) {
/* Restore the original keyboard mode */
ioctl(state->console_fd, KDSKBMODE, state->old_kbd_mode);
close(state->console_fd);
state->console_fd = -1;
}
@ -378,6 +362,39 @@ void SDL_EVDEV_kbd_quit(SDL_EVDEV_keyboard_state *state)
SDL_free(state);
}
void SDL_EVDEV_kbd_set_muted(SDL_EVDEV_keyboard_state *state, SDL_bool muted)
{
if (state == NULL) {
return;
}
if (muted == state->muted) {
return;
}
if (muted) {
/* Allow inhibiting keyboard mute with env. variable for debugging etc. */
if (SDL_getenv("SDL_INPUT_LINUX_KEEP_KBD") == NULL) {
/* Mute the keyboard so keystrokes only generate evdev events
* and do not leak through to the console
*/
ioctl(state->console_fd, KDSKBMODE, K_OFF);
/* Make sure to restore keyboard if application fails to call
* SDL_Quit before exit or fatal signal is raised.
*/
if (!SDL_GetHintBoolean(SDL_HINT_NO_SIGNAL_HANDLERS, SDL_FALSE)) {
kbd_register_emerg_cleanup(state);
}
}
} else {
kbd_unregister_emerg_cleanup();
/* Restore the original keyboard mode */
ioctl(state->console_fd, KDSKBMODE, state->old_kbd_mode);
}
}
/*
* Helper Functions.
*/

1
src/core/linux/SDL_evdev_kbd.h
View File

@ -26,6 +26,7 @@ struct SDL_EVDEV_keyboard_state;
typedef struct SDL_EVDEV_keyboard_state SDL_EVDEV_keyboard_state;
extern SDL_EVDEV_keyboard_state *SDL_EVDEV_kbd_init(void);
extern void SDL_EVDEV_kbd_set_muted(SDL_EVDEV_keyboard_state *state, SDL_bool muted);
extern void SDL_EVDEV_kbd_keycode(SDL_EVDEV_keyboard_state *state, unsigned int keycode, int down);
extern void SDL_EVDEV_kbd_quit(SDL_EVDEV_keyboard_state *state);