Rewrite linux global hotkey to not depend on any libraries (also allows it to work on non-systemd systems(?)), remove unused gsr-window-name

tools/gsr-global-hotkeys/hotplug.c

@@ -0,0 +1,76 @@
+#include "hotplug.h"
+
+/* C stdlib */
+#include <string.h>
+
+/* POSIX */
+#include <unistd.h>
+#include <sys/socket.h>
+
+/* LINUX */
+#include <linux/types.h>
+#include <linux/netlink.h>
+
+bool hotplug_event_init(hotplug_event *self) {
+    memset(self, 0, sizeof(*self));
+
+    struct sockaddr_nl nls = {
+        .nl_family = AF_NETLINK,
+        .nl_pid = getpid(),
+        .nl_groups = -1
+    };
+
+    const int fd = socket(PF_NETLINK, SOCK_DGRAM, NETLINK_KOBJECT_UEVENT);
+    if(fd == -1)
+        return false; /* Not root user */
+
+    if(bind(fd, (void *)&nls, sizeof(struct sockaddr_nl))) {
+        close(fd);
+        return false;
+    }
+
+    self->fd = fd;
+    return true;
+}
+
+void hotplug_event_deinit(hotplug_event *self) {
+    if(self->fd > 0) {
+        close(self->fd);
+        self->fd = -1;
+    }
+}
+
+int hotplug_event_steal_fd(hotplug_event *self) {
+    const int fd = self->fd;
+    self->fd = -1;
+    return fd;
+}
+
+/* TODO: This assumes SUBSYSTEM= is output before DEVNAME=, is that always true? */
+static void hotplug_event_parse_netlink_data(hotplug_event *self, const char *line, hotplug_device_added_callback callback, void *userdata) {
+    const char *at_symbol = strchr(line, '@');
+    if(at_symbol) {
+        self->event_is_add = strncmp(line, "add@", 4) == 0;
+        self->subsystem_is_input = false;
+    } else if(self->event_is_add) {
+        if(strcmp(line, "SUBSYSTEM=input") == 0)
+            self->subsystem_is_input = true;
+
+        if(self->subsystem_is_input && strncmp(line, "DEVNAME=", 8) == 0)
+            callback(line+8, userdata);
+    }
+}
+
+/* Netlink uevent structure is documented here: https://web.archive.org/web/20160127215232/https://www.kernel.org/doc/pending/hotplug.txt */
+void hotplug_event_process_event_data(hotplug_event *self, int fd, hotplug_device_added_callback callback, void *userdata) {
+    const int bytes_read = read(fd, self->event_data, sizeof(self->event_data));
+    int data_index = 0;
+    if(bytes_read <= 0)
+        return;
+
+    /* Hotplug data ends with a newline and a null terminator */
+    while(data_index < bytes_read) {
+        hotplug_event_parse_netlink_data(self, self->event_data + data_index, callback, userdata);
+        data_index += strlen(self->event_data + data_index) + 1; /* Skip null terminator as well */
+    }
+}

tools/gsr-global-hotkeys/hotplug.h

@@ -0,0 +1,22 @@
+#ifndef HOTPLUG_H
+#define HOTPLUG_H
+
+/* C stdlib */
+#include <stdbool.h>
+
+typedef struct {
+    int fd;
+    bool event_is_add;
+    bool subsystem_is_input;
+    char event_data[1024];
+} hotplug_event;
+
+typedef void (*hotplug_device_added_callback)(const char *devname, void *userdata);
+
+bool hotplug_event_init(hotplug_event *self);
+void hotplug_event_deinit(hotplug_event *self);
+
+int hotplug_event_steal_fd(hotplug_event *self);
+void hotplug_event_process_event_data(hotplug_event *self, int fd, hotplug_device_added_callback callback, void *userdata);
+
+#endif /* HOTPLUG_H */

tools/gsr-global-hotkeys/keyboard_event.c

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

tools/gsr-global-hotkeys/keyboard_event.h

@@ -0,0 +1,63 @@
+#ifndef KEYBOARD_EVENT_H
+#define KEYBOARD_EVENT_H
+
+/* Read keyboard input from linux /dev/input/eventN devices, with hotplug support */
+
+#include "hotplug.h"
+
+/* C stdlib */
+#include <stdbool.h>
+#include <stdint.h>
+
+/* POSIX */
+#include <sys/poll.h>
+
+/* LINUX */
+#include <linux/input-event-codes.h>
+
+#define MAX_EVENT_POLLS 32
+
+typedef enum {
+    KEYBOARD_MODKEY_ALT   = 1 << 0,
+    KEYBOARD_MODKEY_SUPER = 1 << 1,
+    KEYBOARD_MODKEY_CTRL  = 1 << 2,
+    KEYBOARD_MODKEY_SHIFT = 1 << 3
+} keyboard_modkeys;
+
+typedef enum {
+    KEYBOARD_BUTTON_RELEASED,
+    KEYBOARD_BUTTON_PRESSED
+} keyboard_button_state;
+
+typedef struct {
+    struct pollfd event_polls[MAX_EVENT_POLLS]; /* Current size is |num_event_polls| */
+    int dev_input_ids[MAX_EVENT_POLLS];         /* Current size is |num_event_polls| */
+    int num_event_polls;
+
+    int stdout_event_index;
+    int hotplug_event_index;
+    bool stdout_failed;
+
+    hotplug_event hotplug_ev;
+
+    keyboard_button_state lshift_button_state;
+    keyboard_button_state rshift_button_state;
+    keyboard_button_state lctrl_button_state;
+    keyboard_button_state rctrl_button_state;
+    keyboard_button_state lalt_button_state;
+    keyboard_button_state ralt_button_state;
+    keyboard_button_state lmeta_button_state;
+    keyboard_button_state rmeta_button_state;
+} keyboard_event;
+
+/* |key| is a KEY_ from linux/input-event-codes.h. |modifiers| is a bitmask of keyboard_modkeys. |press_status| is 0 for released, 1 for pressed and 2 for repeat */
+typedef void (*key_callback)(uint32_t key, uint32_t modifiers, int press_status, void *userdata);
+
+bool keyboard_event_init(keyboard_event *self, bool poll_stdout_error);
+void keyboard_event_deinit(keyboard_event *self);
+
+/* If |timeout_milliseconds| is -1 then wait until an event is received */
+void keyboard_event_poll_events(keyboard_event *self, int timeout_milliseconds, key_callback callback, void *userdata);
+bool keyboard_event_stdout_has_failed(keyboard_event *self);
+
+#endif /* KEYBOARD_EVENT_H */

tools/gsr-global-hotkeys/main.c

@@ -1,28 +1,11 @@
+#include "keyboard_event.h"
+
+/* C stdlib */
 #include <stdio.h>
+#include <stdint.h>
+
+/* POSIX */
 #include <unistd.h>
-#include <fcntl.h>
-#include <string.h>
-#include <errno.h>
-#include <stdbool.h>
-#include <poll.h>
-
-#include <libudev.h>
-#include <libinput.h>
-#include <libevdev/libevdev.h>
-#include <xkbcommon/xkbcommon.h>
-
-typedef struct {
-    struct xkb_context *xkb_context;
-    struct xkb_keymap *xkb_keymap;
-    struct xkb_state *xkb_state;
-} key_mapper;
-
-typedef enum {
-    MODKEY_ALT   = 1 << 0,
-    MODKEY_SUPER = 1 << 1,
-    MODKEY_CTRL  = 1 << 2,
-    MODKEY_SHIFT = 1 << 3
-} modkeys;
 
 typedef struct {
     uint32_t key;
@@ -32,186 +15,28 @@ typedef struct {
 
 #define NUM_GLOBAL_HOTKEYS 6
 static global_hotkey global_hotkeys[NUM_GLOBAL_HOTKEYS] = {
-    { .key = XKB_KEY_z,   .modifiers = MODKEY_ALT,                .action = "show_hide"    },
-    { .key = XKB_KEY_F9,  .modifiers = MODKEY_ALT,                .action = "record"       },
-    { .key = XKB_KEY_F7,  .modifiers = MODKEY_ALT,                .action = "pause"        },
-    { .key = XKB_KEY_F8,  .modifiers = MODKEY_ALT,                .action = "stream"       },
-    { .key = XKB_KEY_F10, .modifiers = MODKEY_ALT | MODKEY_SHIFT, .action = "replay_start" },
-    { .key = XKB_KEY_F10, .modifiers = MODKEY_ALT,                .action = "replay_save"  }
+    { .key = KEY_Z,   .modifiers = KEYBOARD_MODKEY_ALT,                         .action = "show_hide"    },
+    { .key = KEY_F9,  .modifiers = KEYBOARD_MODKEY_ALT,                         .action = "record"       },
+    { .key = KEY_F7,  .modifiers = KEYBOARD_MODKEY_ALT,                         .action = "pause"        },
+    { .key = KEY_F8,  .modifiers = KEYBOARD_MODKEY_ALT,                         .action = "stream"       },
+    { .key = KEY_F10, .modifiers = KEYBOARD_MODKEY_ALT | KEYBOARD_MODKEY_SHIFT, .action = "replay_start" },
+    { .key = KEY_F10, .modifiers = KEYBOARD_MODKEY_ALT,                         .action = "replay_save"  }
 };
 
-static int open_restricted(const char *path, int flags, void *user_data) {
-    (void)user_data;
-    int fd = open(path, flags);
-    if(fd < 0)
-        fprintf(stderr, "error: failed to open %s, error: %s\n", path, strerror(errno));
-    return fd < 0 ? -errno : fd;
-}
+static void on_key_callback(uint32_t key, uint32_t modifiers, int press_status, void *userdata) {
+    (void)userdata;
+    if(press_status != 1) /* 1 == Pressed */
+        return;
 
-static void close_restricted(int fd, void *user_data) {
-    (void)user_data;
-    close(fd);
-}
-
-static const struct libinput_interface interface = {
-    .open_restricted = open_restricted,
-    .close_restricted = close_restricted,
-};
-
-static bool is_mod_key(xkb_keycode_t xkb_key_code) {
-    return xkb_key_code >= XKB_KEY_Shift_L && xkb_key_code <= XKB_KEY_Hyper_R;
-}
-
-typedef struct {
-    const char *modname;
-    modkeys key;
-} modname_to_modkey_map;
-
-static uint32_t xkb_state_to_modifiers(struct xkb_state *xkb_state) {
-    const modname_to_modkey_map modifier_keys[] = {
-        { .modname = XKB_MOD_NAME_ALT,   .key = MODKEY_ALT   },
-        { .modname = XKB_MOD_NAME_LOGO,  .key = MODKEY_SUPER },
-        { .modname = XKB_MOD_NAME_SHIFT, .key = MODKEY_SHIFT },
-        { .modname = XKB_MOD_NAME_CTRL,  .key = MODKEY_CTRL  }
-    };
-
-    uint32_t modifiers = 0;
-    for(int i = 0; i < 4; ++i) {
-        if(xkb_state_mod_name_is_active(xkb_state, modifier_keys[i].modname, XKB_STATE_MODS_EFFECTIVE) > 0)
-            modifiers |= modifier_keys[i].key;
-    }
-    return modifiers;
-}
-
-#define KEY_CODE_EV_TO_XKB(key) ((key) + 8)
-
-static int print_key_event(struct libinput_event *event, key_mapper *mapper) {
-    struct libinput_event_keyboard *keyboard = libinput_event_get_keyboard_event(event);
-    const uint32_t key_code = libinput_event_keyboard_get_key(keyboard);
-    enum libinput_key_state state_code = libinput_event_keyboard_get_key_state(keyboard);
-
-    const xkb_keycode_t xkb_key_code = KEY_CODE_EV_TO_XKB(key_code);
-    xkb_state_update_key(mapper->xkb_state, xkb_key_code, state_code == LIBINPUT_KEY_STATE_PRESSED ? XKB_KEY_DOWN : XKB_KEY_UP);
-    xkb_keysym_t xkb_key_sym = xkb_state_key_get_one_sym(mapper->xkb_state, xkb_key_code);
-    // char main_key[128];
-    // main_key[0] = '\0';
-
-    // if(xkb_state_mod_name_is_active(mapper->xkb_state, XKB_MOD_NAME_LOGO, XKB_STATE_MODS_EFFECTIVE) > 0)
-    //     strcat(main_key, "Super+");
-    // if(xkb_state_mod_name_is_active(mapper->xkb_state, XKB_MOD_NAME_CTRL, XKB_STATE_MODS_EFFECTIVE) > 0)
-    //     strcat(main_key, "Ctrl+");
-    // if(xkb_state_mod_name_is_active(mapper->xkb_state, XKB_MOD_NAME_ALT, XKB_STATE_MODS_EFFECTIVE) > 0 && strcmp(main_key, "Meta") != 0)
-    //     strcat(main_key, "Alt+");
-    // if(xkb_state_mod_name_is_active(mapper->xkb_state, XKB_MOD_NAME_SHIFT, XKB_STATE_MODS_EFFECTIVE) > 0)
-    //     strcat(main_key, "Shift+");
-
-    // if(!is_mod_key(xkb_key_sym)) {
-    //     char reg_key[64];
-    //     reg_key[0] = '\0';
-    //     xkb_keysym_get_name(xkb_key_sym, reg_key, sizeof(reg_key));
-    //     strcat(main_key, reg_key);
-    // }
-
-    if(state_code != LIBINPUT_KEY_STATE_PRESSED)
-        return 0;
-
-    const uint32_t current_modifiers = xkb_state_to_modifiers(mapper->xkb_state);
     for(int i = 0; i < NUM_GLOBAL_HOTKEYS; ++i) {
-        if(xkb_key_sym == global_hotkeys[i].key && current_modifiers == global_hotkeys[i].modifiers) {
+        if(key == global_hotkeys[i].key && modifiers == global_hotkeys[i].modifiers) {
             puts(global_hotkeys[i].action);
             fflush(stdout);
-            break;
         }
     }
-
-    return 0;
-}
-
-static int handle_events(struct libinput *libinput, key_mapper *mapper) {
-    int result = -1;
-    struct libinput_event *event;
-
-    if(libinput_dispatch(libinput) < 0)
-        return result;
-
-    while((event = libinput_get_event(libinput)) != NULL) {
-        if(libinput_event_get_type(event) == LIBINPUT_EVENT_KEYBOARD_KEY)
-            print_key_event(event, mapper);
-
-        libinput_event_destroy(event);
-        result = 0;
-    }
-
-    return result;
-}
-
-static int run_mainloop(struct libinput *libinput, key_mapper *mapper) {
-    struct pollfd fds[2] = {
-        {
-            .fd = libinput_get_fd(libinput),
-            .events = POLLIN,
-            .revents = 0
-        },
-        {
-            .fd = STDOUT_FILENO,
-            .events = 0,
-            .revents = 0
-        }
-    };
-
-    if(handle_events(libinput, mapper) != 0) {
-        fprintf(stderr, "error: didn't receive device added events. Is this program not running as root?\n");
-        return -1;
-    }
-
-    while(poll(fds, 2, -1) >= 0) {
-        if(fds[0].revents & POLLIN)
-            handle_events(libinput, mapper);
-        if(fds[1].revents & (POLLHUP|POLLERR))
-            break;
-    }
-
-    return 0;
-}
-
-static bool mapper_refresh_keymap(key_mapper *mapper) {
-    if(mapper->xkb_keymap != NULL) {
-        xkb_keymap_unref(mapper->xkb_keymap);
-        mapper->xkb_keymap = NULL;
-    }
-
-    // TODO:
-    struct xkb_rule_names names = {
-        NULL, NULL,
-        NULL,//keymap_is_default(mapper->layout) ? NULL : mapper->layout,
-        NULL,//keymap_is_default(mapper->variant) ? NULL : mapper->variant,
-        NULL
-    };
-    mapper->xkb_keymap = xkb_keymap_new_from_names(mapper->xkb_context, &names, XKB_KEYMAP_COMPILE_NO_FLAGS);
-    if(mapper->xkb_keymap == NULL) {
-        fprintf(stderr, "error: failed to create XKB keymap.\n");
-        return false;
-    }
-
-    if(mapper->xkb_state != NULL) {
-        xkb_state_unref(mapper->xkb_state);
-        mapper->xkb_state = NULL;
-    }
-
-    mapper->xkb_state = xkb_state_new(mapper->xkb_keymap);
-    if(mapper->xkb_state == NULL) {
-        fprintf(stderr, "error: failed to create XKB state.\n");
-        return false;
-    }
-
-    return true;
 }
 
 int main(void) {
-    int result = 0;
-    struct udev *udev = NULL;
-    struct libinput *libinput = NULL;
-
     const uid_t user_id = getuid();
     if(geteuid() != 0) {
         if(setuid(0) == -1) {
@@ -220,53 +45,24 @@ int main(void) {
         }
     }
 
-    udev = udev_new();
-    if(!udev) {
-        fprintf(stderr, "error: udev_new failed\n");
-        result = 1;
-        goto done;
+    keyboard_event keyboard_ev;
+    if(!keyboard_event_init(&keyboard_ev, true)) {
+        fprintf(stderr, "Error: failed to setup hotplugging and no keyboard input devices were found\n");
+        setuid(user_id);
+        return 1;
     }
 
-    libinput = libinput_udev_create_context(&interface, NULL, udev);
-    if(!libinput) {
-        fprintf(stderr, "error: libinput_udev_create_context failed\n");
-        result = 1;
-        goto done;
+    for(;;) {
+        keyboard_event_poll_events(&keyboard_ev, -1, on_key_callback, NULL);
+        if(keyboard_event_stdout_has_failed(&keyboard_ev)) {
+            fprintf(stderr, "Info: stdout closed (parent process likely closed this process), exiting...\n");
+            break;
+        }
+
+
     }
 
-    if(libinput_udev_assign_seat(libinput, "seat0") != 0) {
-        fprintf(stderr, "error: libinput_udev_assign_seat with seat0 failed\n");
-        result = 1;
-        goto done;
-    }
-
-    key_mapper mapper;
-    mapper.xkb_context = xkb_context_new(XKB_CONTEXT_NO_FLAGS);
-    if(!mapper.xkb_context) {
-        fprintf(stderr, "error: xkb_context_new failed\n");
-        result = 1;
-        goto done;
-    }
-
-    if(!mapper_refresh_keymap(&mapper)) {
-        fprintf(stderr, "error: key mapper failed\n");
-        result = 1;
-        goto done;
-    }
-
-    if(run_mainloop(libinput, &mapper) < 0) {
-        fprintf(stderr, "error: failed to start main loop\n");
-        result = 1;
-        goto done;
-    }
-
-    done:
-    if(libinput)
-        libinput_unref(libinput);
-
-    if(udev)
-        udev_unref(udev);
-
+    keyboard_event_deinit(&keyboard_ev);
     setuid(user_id);
-    return result;
+    return 0;
 }