mirror of
https://repo.dec05eba.com/gpu-screen-recorder-ui
synced 2026-03-31 09:17:04 +09:00
Rewrite linux global hotkey to not depend on any libraries (also allows it to work on non-systemd systems(?)), remove unused gsr-window-name
This commit is contained in:
dec05eba
273
tools/gsr-global-hotkeys/keyboard_event.c
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273
tools/gsr-global-hotkeys/keyboard_event.c
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#include "keyboard_event.h"
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/* C stdlib */
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#include <stdio.h>
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#include <string.h>
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#include <errno.h>
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#include <stdbool.h>
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/* POSIX */
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#include <fcntl.h>
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#include <unistd.h>
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#include <dirent.h>
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#include <sys/poll.h>
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/* LINUX */
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#include <linux/input.h>
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/*
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We could get initial keyboard state with:
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unsigned char key_states[KEY_MAX/8 + 1];
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ioctl(fd, EVIOCGKEY(sizeof(key_states)), key_states), but ignore that for now
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*/
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static void keyboard_event_process_input_event_data(keyboard_event *self, int fd, key_callback callback, void *userdata) {
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struct input_event event;
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if(read(fd, &event, sizeof(event)) != sizeof(event)) {
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fprintf(stderr, "Error: failed to read input event data\n");
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return;
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}
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// value = 1 == key pressed
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//if(event.type == EV_KEY && event.code == KEY_A && event.value == 1) {
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//fprintf(stderr, "fd: %d, type: %d, pressed %d, value: %d\n", fd, event.type, event.code, event.value);
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//}
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if(event.type == EV_KEY) {
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switch(event.code) {
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case KEY_LEFTSHIFT:
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self->lshift_button_state = event.value >= 1 ? KEYBOARD_BUTTON_PRESSED : KEYBOARD_BUTTON_RELEASED;
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break;
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case KEY_RIGHTSHIFT:
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self->rshift_button_state = event.value >= 1 ? KEYBOARD_BUTTON_PRESSED : KEYBOARD_BUTTON_RELEASED;
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break;
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case KEY_LEFTCTRL:
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self->lctrl_button_state = event.value >= 1 ? KEYBOARD_BUTTON_PRESSED : KEYBOARD_BUTTON_RELEASED;
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break;
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case KEY_RIGHTCTRL:
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self->rctrl_button_state = event.value >= 1 ? KEYBOARD_BUTTON_PRESSED : KEYBOARD_BUTTON_RELEASED;
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break;
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case KEY_LEFTALT:
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self->lalt_button_state = event.value >= 1 ? KEYBOARD_BUTTON_PRESSED : KEYBOARD_BUTTON_RELEASED;
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break;
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case KEY_RIGHTALT:
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self->ralt_button_state = event.value >= 1 ? KEYBOARD_BUTTON_PRESSED : KEYBOARD_BUTTON_RELEASED;
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break;
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case KEY_LEFTMETA:
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self->lmeta_button_state = event.value >= 1 ? KEYBOARD_BUTTON_PRESSED : KEYBOARD_BUTTON_RELEASED;
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break;
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case KEY_RIGHTMETA:
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self->rmeta_button_state = event.value >= 1 ? KEYBOARD_BUTTON_PRESSED : KEYBOARD_BUTTON_RELEASED;
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break;
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default: {
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const bool shift_pressed = self->lshift_button_state == KEYBOARD_BUTTON_PRESSED || self->rshift_button_state == KEYBOARD_BUTTON_PRESSED;
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const bool ctrl_pressed = self->lctrl_button_state == KEYBOARD_BUTTON_PRESSED || self->rctrl_button_state == KEYBOARD_BUTTON_PRESSED;
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const bool alt_pressed = self->lalt_button_state == KEYBOARD_BUTTON_PRESSED || self->ralt_button_state == KEYBOARD_BUTTON_PRESSED;
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const bool meta_pressed = self->lmeta_button_state == KEYBOARD_BUTTON_PRESSED || self->rmeta_button_state == KEYBOARD_BUTTON_PRESSED;
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//fprintf(stderr, "pressed key: %d, state: %d, shift: %s, ctrl: %s, alt: %s, meta: %s\n", event.code, event.value,
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// shift_pressed ? "yes" : "no", ctrl_pressed ? "yes" : "no", alt_pressed ? "yes" : "no", meta_pressed ? "yes" : "no");
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uint32_t modifiers = 0;
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if(shift_pressed)
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modifiers |= KEYBOARD_MODKEY_SHIFT;
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if(ctrl_pressed)
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modifiers |= KEYBOARD_MODKEY_CTRL;
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if(alt_pressed)
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modifiers |= KEYBOARD_MODKEY_ALT;
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if(meta_pressed)
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modifiers |= KEYBOARD_MODKEY_SUPER;
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callback(event.code, modifiers, event.value, userdata);
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break;
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}
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}
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}
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}
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/* Returns -1 if invalid format. Expected |dev_input_filepath| to be in format /dev/input/eventN */
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static int get_dev_input_id_from_filepath(const char *dev_input_filepath) {
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if(strncmp(dev_input_filepath, "/dev/input/event", 16) != 0)
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return -1;
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int dev_input_id = -1;
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if(sscanf(dev_input_filepath + 16, "%d", &dev_input_id) == 1)
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return dev_input_id;
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return -1;
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}
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static bool keyboard_event_has_event_with_dev_input_fd(keyboard_event *self, int dev_input_id) {
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for(int i = 0; i < self->num_event_polls; ++i) {
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if(self->dev_input_ids[i] == dev_input_id)
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return true;
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}
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return false;
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}
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static bool keyboard_event_try_add_device_if_keyboard(keyboard_event *self, const char *dev_input_filepath) {
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const int dev_input_id = get_dev_input_id_from_filepath(dev_input_filepath);
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if(dev_input_id == -1)
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return false;
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if(keyboard_event_has_event_with_dev_input_fd(self, dev_input_id))
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return false;
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const int fd = open(dev_input_filepath, O_RDONLY);
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if(fd == -1)
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return false;
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char device_name[256];
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device_name[0] = '\0';
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ioctl(fd, EVIOCGNAME(sizeof(device_name)), device_name);
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unsigned long evbit = 0;
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ioctl(fd, EVIOCGBIT(0, sizeof(evbit)), &evbit);
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if(evbit & (1 << EV_KEY)) {
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unsigned char key_bits[KEY_MAX/8 + 1] = {0};
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ioctl(fd, EVIOCGBIT(EV_KEY, sizeof(key_bits)), &key_bits);
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/* Test if device supports KEY_A since not all devices that support EV_KEY are keyboards, for example even a power button is an EV_KEY */
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const int key_test = KEY_A;
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const bool supports_key_events = key_bits[key_test/8] & (1 << (key_test % 8));
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if(supports_key_events) {
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if(self->num_event_polls < MAX_EVENT_POLLS) {
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//fprintf(stderr, "%s (%s) supports key inputs\n", dev_input_filepath, device_name);
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self->event_polls[self->num_event_polls] = (struct pollfd) {
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.fd = fd,
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.events = POLLIN,
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.revents = 0
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};
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self->dev_input_ids[self->num_event_polls] = dev_input_id;
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++self->num_event_polls;
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return true;
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} else {
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fprintf(stderr, "Warning: the maximum number of keyboard devices have been registered. The newly added keyboard will be ignored\n");
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}
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}
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}
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close(fd);
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return false;
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}
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static bool keyboard_event_add_dev_input_devices(keyboard_event *self) {
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DIR *dir = opendir("/dev/input");
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if(!dir) {
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fprintf(stderr, "error: failed to open /dev/input, error: %s\n", strerror(errno));
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return false;
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}
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char dev_input_filepath[1024];
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for(;;) {
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struct dirent *entry = readdir(dir);
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if(!entry)
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break;
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if(strncmp(entry->d_name, "event", 5) != 0)
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continue;
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snprintf(dev_input_filepath, sizeof(dev_input_filepath), "/dev/input/%s", entry->d_name);
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keyboard_event_try_add_device_if_keyboard(self, dev_input_filepath);
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}
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closedir(dir);
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return true;
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}
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static void keyboard_event_remove_event(keyboard_event *self, int index) {
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if(index < 0 || index >= self->num_event_polls)
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return;
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close(self->event_polls[index].fd);
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for(int j = index + 1; j < self->num_event_polls; ++j) {
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self->event_polls[j - 1] = self->event_polls[j];
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self->dev_input_ids[j - 1] = self->dev_input_ids[j];
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}
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--self->num_event_polls;
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}
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bool keyboard_event_init(keyboard_event *self, bool poll_stdout_error) {
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memset(self, 0, sizeof(*self));
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self->stdout_event_index = -1;
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self->hotplug_event_index = -1;
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if(poll_stdout_error) {
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self->event_polls[self->num_event_polls] = (struct pollfd) {
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.fd = STDOUT_FILENO,
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.events = 0,
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.revents = 0
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};
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self->dev_input_ids[self->num_event_polls] = -1;
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self->stdout_event_index = self->num_event_polls;
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++self->num_event_polls;
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}
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if(hotplug_event_init(&self->hotplug_ev)) {
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self->event_polls[self->num_event_polls] = (struct pollfd) {
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.fd = hotplug_event_steal_fd(&self->hotplug_ev),
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.events = POLLIN,
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.revents = 0
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};
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self->dev_input_ids[self->num_event_polls] = -1;
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self->hotplug_event_index = self->num_event_polls;
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++self->num_event_polls;
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} else {
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fprintf(stderr, "Warning: failed to setup hotplugging\n");
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}
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keyboard_event_add_dev_input_devices(self);
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/* Neither hotplugging nor any keyboard devices were found. We will never listen to keyboard events so might as well fail */
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if(self->num_event_polls == 0) {
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keyboard_event_deinit(self);
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return false;
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}
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return true;
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}
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void keyboard_event_deinit(keyboard_event *self) {
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for(int i = 0; i < self->num_event_polls; ++i) {
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close(self->event_polls[i].fd);
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}
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self->num_event_polls = 0;
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hotplug_event_deinit(&self->hotplug_ev);
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}
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static void on_device_added_callback(const char *devname, void *userdata) {
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keyboard_event *keyboard_ev = userdata;
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char dev_input_filepath[1024];
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snprintf(dev_input_filepath, sizeof(dev_input_filepath), "/dev/%s", devname);
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keyboard_event_try_add_device_if_keyboard(keyboard_ev, dev_input_filepath);
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}
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void keyboard_event_poll_events(keyboard_event *self, int timeout_milliseconds, key_callback callback, void *userdata) {
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if(poll(self->event_polls, self->num_event_polls, timeout_milliseconds) <= 0)
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return;
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for(int i = 0; i < self->num_event_polls; ++i) {
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if(i == self->stdout_event_index && self->event_polls[i].revents & (POLLHUP|POLLERR))
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self->stdout_failed = true;
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if(self->event_polls[i].revents & POLLHUP) { /* TODO: What if this is the hotplug fd? */
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keyboard_event_remove_event(self, i);
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--i; /* Repeat same index since the current element has been removed */
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continue;
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}
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if(!(self->event_polls[i].revents & POLLIN))
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continue;
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if(i == self->hotplug_event_index)
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/* Device is added to end of |event_polls| so it's ok to add while iterating it via index */
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hotplug_event_process_event_data(&self->hotplug_ev, self->event_polls[i].fd, on_device_added_callback, self);
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else
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keyboard_event_process_input_event_data(self, self->event_polls[i].fd, callback, userdata);
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}
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}
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bool keyboard_event_stdout_has_failed(keyboard_event *self) {
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return self->stdout_failed;
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}
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