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Implemented VT switching for KMSDRM on Linux

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Fixes https://github.com/libsdl-org/SDL/issues/3844
This commit is contained in:
Sam Lantinga 2023-11-08 10:33:40 -08:00
parent 391a3d23d0
commit f4b61fff30
8 changed files with 252 additions and 31 deletions
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211
src/core/linux/SDL_evdev_kbd.c
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@ -99,6 +99,10 @@ struct SDL_EVDEV_keyboard_state
char shift_state;
char text[128];
unsigned int text_len;
void (*vt_release_callback)(void *);
void *vt_release_callback_data;
void (*vt_acquire_callback)(void *);
void *vt_acquire_callback_data;
};
#ifdef DUMP_ACCENTS
@ -296,6 +300,128 @@ static void kbd_register_emerg_cleanup(SDL_EVDEV_keyboard_state *kbd)
}
}
enum {
VT_SIGNAL_NONE,
VT_SIGNAL_RELEASE,
VT_SIGNAL_ACQUIRE,
};
static int vt_release_signal;
static int vt_acquire_signal;
static SDL_AtomicInt vt_signal_pending;
typedef void (*signal_handler)(int signum);
static void kbd_vt_release_signal_action(int signum)
{
printf("kbd_vt_release_signal_action\n");
SDL_AtomicSet(&vt_signal_pending, VT_SIGNAL_RELEASE);
}
static void kbd_vt_acquire_signal_action(int signum)
{
printf("kbd_vt_acquire_signal_action\n");
SDL_AtomicSet(&vt_signal_pending, VT_SIGNAL_ACQUIRE);
}
static SDL_bool setup_vt_signal(int signum, signal_handler handler)
{
struct sigaction *old_action_p;
struct sigaction new_action;
old_action_p = &(old_sigaction[signum]);
SDL_zero(new_action);
new_action.sa_handler = handler;
new_action.sa_flags = SA_RESTART;
if (sigaction(signum, &new_action, old_action_p) < 0) {
return SDL_FALSE;
}
if (old_action_p->sa_handler != SIG_DFL) {
/* This signal is already in use */
sigaction(signum, old_action_p, NULL);
return SDL_FALSE;
}
return SDL_TRUE;
}
static int find_free_signal(signal_handler handler)
{
#ifdef SIGRTMIN
int i;
for (i = SIGRTMIN + 2; i <= SIGRTMAX; ++i) {
if (setup_vt_signal(i, handler)) {
return i;
}
}
#endif
if (setup_vt_signal(SIGUSR1, handler)) {
return SIGUSR1;
}
if (setup_vt_signal(SIGUSR2, handler)) {
return SIGUSR2;
}
return 0;
}
static void kbd_vt_quit(int console_fd)
{
struct vt_mode mode;
if (vt_release_signal) {
sigaction(vt_release_signal, &old_sigaction[vt_release_signal], NULL);
vt_release_signal = 0;
}
if (vt_acquire_signal) {
sigaction(vt_acquire_signal, &old_sigaction[vt_acquire_signal], NULL);
vt_acquire_signal = 0;
}
SDL_zero(mode);
mode.mode = VT_AUTO;
ioctl(console_fd, VT_SETMODE, &mode);
}
static int kbd_vt_init(int console_fd)
{
struct vt_mode mode;
vt_release_signal = find_free_signal(kbd_vt_release_signal_action);
vt_acquire_signal = find_free_signal(kbd_vt_acquire_signal_action);
if (!vt_release_signal || !vt_acquire_signal ) {
kbd_vt_quit(console_fd);
return -1;
}
SDL_zero(mode);
mode.mode = VT_PROCESS;
mode.relsig = vt_release_signal;
mode.acqsig = vt_acquire_signal;
mode.frsig = SIGIO;
if (ioctl(console_fd, VT_SETMODE, &mode) < 0) {
kbd_vt_quit(console_fd);
return -1;
}
return 0;
}
static void kbd_vt_update(SDL_EVDEV_keyboard_state *state)
{
int signal_pending = SDL_AtomicGet(&vt_signal_pending);
if (signal_pending != VT_SIGNAL_NONE) {
if (signal_pending == VT_SIGNAL_RELEASE) {
if (state->vt_release_callback) {
state->vt_release_callback(state->vt_release_callback_data);
}
ioctl(state->console_fd, VT_RELDISP, 1);
} else {
if (state->vt_acquire_callback) {
state->vt_acquire_callback(state->vt_acquire_callback_data);
}
ioctl(state->console_fd, VT_RELDISP, VT_ACKACQ);
}
SDL_AtomicCAS(&vt_signal_pending, signal_pending, VT_SIGNAL_NONE);
}
}
SDL_EVDEV_keyboard_state *SDL_EVDEV_kbd_init(void)
{
SDL_EVDEV_keyboard_state *kbd;
@ -333,35 +459,11 @@ SDL_EVDEV_keyboard_state *SDL_EVDEV_kbd_init(void)
ioctl(kbd->console_fd, KDSKBMODE, K_UNICODE);
}
kbd_vt_init(kbd->console_fd);
return kbd;
}
void SDL_EVDEV_kbd_quit(SDL_EVDEV_keyboard_state *state)
{
if (state == NULL) {
return;
}
SDL_EVDEV_kbd_set_muted(state, SDL_FALSE);
if (state->console_fd >= 0) {
close(state->console_fd);
state->console_fd = -1;
}
if (state->key_maps && state->key_maps != default_key_maps) {
int i;
for (i = 0; i < MAX_NR_KEYMAPS; ++i) {
if (state->key_maps[i]) {
SDL_free(state->key_maps[i]);
}
}
SDL_free(state->key_maps);
}
SDL_free(state);
}
void SDL_EVDEV_kbd_set_muted(SDL_EVDEV_keyboard_state *state, SDL_bool muted)
{
if (state == NULL) {
@ -396,6 +498,55 @@ void SDL_EVDEV_kbd_set_muted(SDL_EVDEV_keyboard_state *state, SDL_bool muted)
state->muted = muted;
}
void SDL_EVDEV_kbd_set_vt_switch_callbacks(SDL_EVDEV_keyboard_state *state, void (*release_callback)(void*), void *release_callback_data, void (*acquire_callback)(void*), void *acquire_callback_data)
{
if (state == NULL) {
return;
}
state->vt_release_callback = release_callback;
state->vt_release_callback_data = release_callback_data;
state->vt_acquire_callback = acquire_callback;
state->vt_acquire_callback_data = acquire_callback_data;
}
void SDL_EVDEV_kbd_update(SDL_EVDEV_keyboard_state *state)
{
if (!state) {
return;
}
kbd_vt_update(state);
}
void SDL_EVDEV_kbd_quit(SDL_EVDEV_keyboard_state *state)
{
if (state == NULL) {
return;
}
SDL_EVDEV_kbd_set_muted(state, SDL_FALSE);
kbd_vt_quit(state->console_fd);
if (state->console_fd >= 0) {
close(state->console_fd);
state->console_fd = -1;
}
if (state->key_maps && state->key_maps != default_key_maps) {
int i;
for (i = 0; i < MAX_NR_KEYMAPS; ++i) {
if (state->key_maps[i]) {
SDL_free(state->key_maps[i]);
}
}
SDL_free(state->key_maps);
}
SDL_free(state);
}
/*
* Helper Functions.
*/
@ -830,6 +981,14 @@ void SDL_EVDEV_kbd_set_muted(SDL_EVDEV_keyboard_state *state, SDL_bool muted)
{
}
void SDL_EVDEV_kbd_set_vt_switch_callbacks(SDL_EVDEV_keyboard_state *state, void (*release_callback)(void*), void *release_callback_data, void (*acquire_callback)(void*), void *acquire_callback_data)
{
}
void SDL_EVDEV_kbd_update(SDL_EVDEV_keyboard_state *state)
{
}
void SDL_EVDEV_kbd_keycode(SDL_EVDEV_keyboard_state *state, unsigned int keycode, int down)
{
}