2 * vim:ts=4:sw=4:expandtab
4 * © 2010-2013 Michael Stapelberg
6 * See LICENSE for licensing information
19 #include <security/pam_appl.h>
20 #include <X11/Xlib-xcb.h>
25 #include <X11/XKBlib.h>
26 #include <X11/extensions/XKBfile.h>
27 #include <xkbcommon/xkbcommon.h>
29 #include <cairo/cairo-xcb.h>
34 #include "unlock_indicator.h"
37 #define TSTAMP_N_SECS(n) (n * 1.0)
38 #define TSTAMP_N_MINS(n) (60 * TSTAMP_N_SECS(n))
39 #define START_TIMER(timer_obj, timeout, callback) \
40 timer_obj = start_timer(timer_obj, timeout, callback)
41 #define STOP_TIMER(timer_obj) \
42 timer_obj = stop_timer(timer_obj)
44 typedef void (*ev_callback_t)(EV_P_ ev_timer *w, int revents);
46 /* We need this for libxkbfile */
47 static Display *display;
48 char color[7] = "ffffff";
49 int inactivity_timeout = 30;
50 uint32_t last_resolution[2];
52 static xcb_cursor_t cursor;
53 static pam_handle_t *pam_handle;
54 int input_position = 0;
55 /* Holds the password you enter (in UTF-8). */
56 static char password[512];
57 static bool beep = false;
58 bool debug_mode = false;
59 static bool dpms = false;
60 bool unlock_indicator = true;
61 static bool dont_fork = false;
62 struct ev_loop *main_loop;
63 static struct ev_timer *clear_pam_wrong_timeout;
64 static struct ev_timer *clear_indicator_timeout;
65 static struct ev_timer *dpms_timeout;
66 static struct ev_timer *discard_passwd_timeout;
67 extern unlock_state_t unlock_state;
68 extern pam_state_t pam_state;
70 static struct xkb_state *xkb_state;
71 static struct xkb_context *xkb_context;
72 static struct xkb_keymap *xkb_keymap;
74 cairo_surface_t *img = NULL;
76 bool ignore_empty_password = false;
78 /* isutf, u8_dec © 2005 Jeff Bezanson, public domain */
79 #define isutf(c) (((c) & 0xC0) != 0x80)
82 * Decrements i to point to the previous unicode glyph
85 void u8_dec(char *s, int *i) {
86 (void)(isutf(s[--(*i)]) || isutf(s[--(*i)]) || isutf(s[--(*i)]) || --(*i));
89 static void turn_monitors_on(void) {
91 dpms_set_mode(conn, XCB_DPMS_DPMS_MODE_ON);
94 static void turn_monitors_off(void) {
96 dpms_set_mode(conn, XCB_DPMS_DPMS_MODE_OFF);
100 * Loads the XKB keymap from the X11 server and feeds it to xkbcommon.
101 * Necessary so that we can properly let xkbcommon track the keyboard state and
102 * translate keypresses to utf-8.
104 * Ideally, xkbcommon would ship something like this itself, but as of now
105 * (version 0.2.0), it doesn’t.
107 * TODO: Once xcb-xkb is enabled by default and released, we should port this
108 * code to xcb-xkb. See also https://github.com/xkbcommon/libxkbcommon/issues/1
111 static bool load_keymap(void) {
114 memset(&result, '\0', sizeof(result));
115 result.xkb = XkbGetKeyboard(display, XkbAllMapComponentsMask, XkbUseCoreKbd);
116 if (result.xkb == NULL) {
117 fprintf(stderr, "[i3lock] XKB: XkbGetKeyboard failed\n");
121 FILE *temp = tmpfile();
123 fprintf(stderr, "[i3lock] could not create tempfile\n");
127 bool ok = XkbWriteXKBKeymap(temp, &result, false, false, NULL, NULL);
129 fprintf(stderr, "[i3lock] XkbWriteXKBKeymap failed\n");
135 if (xkb_context == NULL) {
136 if ((xkb_context = xkb_context_new(0)) == NULL) {
137 fprintf(stderr, "[i3lock] could not create xkbcommon context\n");
142 if (xkb_keymap != NULL)
143 xkb_keymap_unref(xkb_keymap);
145 if ((xkb_keymap = xkb_keymap_new_from_file(xkb_context, temp, XKB_KEYMAP_FORMAT_TEXT_V1, 0)) == NULL) {
146 fprintf(stderr, "[i3lock] xkb_keymap_new_from_file failed\n");
150 struct xkb_state *new_state = xkb_state_new(xkb_keymap);
151 if (new_state == NULL) {
152 fprintf(stderr, "[i3lock] xkb_state_new failed\n");
156 /* Get the initial modifier state to be in sync with the X server.
157 * See https://github.com/xkbcommon/libxkbcommon/issues/1 for why we ignore
158 * the base and latched fields. */
159 XkbStateRec state_rec;
160 XkbGetState(display, XkbUseCoreKbd, &state_rec);
162 xkb_state_update_mask(new_state,
163 0, 0, state_rec.locked_mods,
164 0, 0, state_rec.locked_group);
166 if (xkb_state != NULL)
167 xkb_state_unref(xkb_state);
168 xkb_state = new_state;
172 XkbFreeKeyboard(result.xkb, XkbAllComponentsMask, true);
178 * Clears the memory which stored the password to be a bit safer against
182 static void clear_password_memory(void) {
183 /* A volatile pointer to the password buffer to prevent the compiler from
184 * optimizing this out. */
185 volatile char *vpassword = password;
186 for (int c = 0; c < sizeof(password); c++)
187 /* We store a non-random pattern which consists of the (irrelevant)
188 * index plus (!) the value of the beep variable. This prevents the
189 * compiler from optimizing the calls away, since the value of 'beep'
190 * is not known at compile-time. */
191 vpassword[c] = c + (int)beep;
194 ev_timer* start_timer(ev_timer *timer_obj, ev_tstamp timeout, ev_callback_t callback) {
196 ev_timer_stop(main_loop, timer_obj);
197 ev_timer_set(timer_obj, timeout, 0.);
198 ev_timer_start(main_loop, timer_obj);
200 /* When there is no memory, we just don’t have a timeout. We cannot
201 * exit() here, since that would effectively unlock the screen. */
202 timer_obj = calloc(sizeof(struct ev_timer), 1);
204 ev_timer_init(timer_obj, callback, timeout, 0.);
205 ev_timer_start(main_loop, timer_obj);
211 ev_timer* stop_timer(ev_timer *timer_obj) {
213 ev_timer_stop(main_loop, timer_obj);
220 * Resets pam_state to STATE_PAM_IDLE 2 seconds after an unsuccesful
221 * authentication event.
224 static void clear_pam_wrong(EV_P_ ev_timer *w, int revents) {
225 DEBUG("clearing pam wrong\n");
226 pam_state = STATE_PAM_IDLE;
227 unlock_state = STATE_STARTED;
230 /* Now free this timeout. */
231 ev_timer_stop(main_loop, clear_pam_wrong_timeout);
232 free(clear_pam_wrong_timeout);
233 clear_pam_wrong_timeout = NULL;
236 static void clear_indicator_cb(EV_P_ ev_timer *w, int revents) {
238 STOP_TIMER(clear_indicator_timeout);
241 static void clear_input(void) {
243 clear_password_memory();
244 password[input_position] = '\0';
246 /* Hide the unlock indicator after a bit if the password buffer is
248 START_TIMER(clear_indicator_timeout, 1.0, clear_indicator_cb);
249 unlock_state = STATE_BACKSPACE_ACTIVE;
251 unlock_state = STATE_KEY_PRESSED;
254 static void turn_off_monitors_cb(EV_P_ ev_timer *w, int revents) {
255 if (input_position == 0)
258 STOP_TIMER(dpms_timeout);
261 static void discard_passwd_cb(EV_P_ ev_timer *w, int revents) {
264 STOP_TIMER(discard_passwd_timeout);
267 static void input_done(void) {
268 if (clear_pam_wrong_timeout) {
269 ev_timer_stop(main_loop, clear_pam_wrong_timeout);
270 free(clear_pam_wrong_timeout);
271 clear_pam_wrong_timeout = NULL;
274 pam_state = STATE_PAM_VERIFY;
277 if (pam_authenticate(pam_handle, 0) == PAM_SUCCESS) {
278 DEBUG("successfully authenticated\n");
279 clear_password_memory();
280 /* Turn the screen on, as it may have been turned off
281 * on release of the 'enter' key. */
287 fprintf(stderr, "Authentication failure\n");
289 pam_state = STATE_PAM_WRONG;
293 /* Clear this state after 2 seconds (unless the user enters another
294 * password during that time). */
295 ev_now_update(main_loop);
296 if ((clear_pam_wrong_timeout = calloc(sizeof(struct ev_timer), 1))) {
297 ev_timer_init(clear_pam_wrong_timeout, clear_pam_wrong, 2.0, 0.);
298 ev_timer_start(main_loop, clear_pam_wrong_timeout);
301 /* Cancel the clear_indicator_timeout, it would hide the unlock indicator
303 STOP_TIMER(clear_indicator_timeout);
305 /* beep on authentication failure, if enabled */
313 * Called when the user releases a key. We need to leave the Mode_switch
314 * state when the user releases the Mode_switch key.
317 static void handle_key_release(xcb_key_release_event_t *event) {
318 xkb_state_update_key(xkb_state, event->detail, XKB_KEY_UP);
321 static void redraw_timeout(EV_P_ ev_timer *w, int revents) {
324 ev_timer_stop(main_loop, w);
329 * Handle key presses. Fixes state, then looks up the key symbol for the
330 * given keycode, then looks up the key symbol (as UCS-2), converts it to
331 * UTF-8 and stores it in the password array.
334 static void handle_key_press(xcb_key_press_event_t *event) {
340 ksym = xkb_state_key_get_one_sym(xkb_state, event->detail);
341 ctrl = xkb_state_mod_name_is_active(xkb_state, "Control", XKB_STATE_MODS_DEPRESSED);
342 xkb_state_update_key(xkb_state, event->detail, XKB_KEY_DOWN);
344 /* The buffer will be null-terminated, so n >= 2 for 1 actual character. */
345 memset(buffer, '\0', sizeof(buffer));
346 n = xkb_keysym_to_utf8(ksym, buffer, sizeof(buffer));
350 case XKB_KEY_KP_Enter:
351 case XKB_KEY_XF86ScreenSaver:
352 if (ignore_empty_password && input_position == 0) {
356 password[input_position] = '\0';
357 unlock_state = STATE_KEY_PRESSED;
364 DEBUG("C-u pressed\n");
374 case XKB_KEY_BackSpace:
375 if (input_position == 0)
378 /* decrement input_position to point to the previous glyph */
379 u8_dec(password, &input_position);
380 password[input_position] = '\0';
382 /* Hide the unlock indicator after a bit if the password buffer is
384 START_TIMER(clear_indicator_timeout, 1.0, clear_indicator_cb);
385 unlock_state = STATE_BACKSPACE_ACTIVE;
387 unlock_state = STATE_KEY_PRESSED;
391 if ((input_position + 8) >= sizeof(password))
395 /* FIXME: handle all of these? */
396 printf("is_keypad_key = %d\n", xcb_is_keypad_key(sym));
397 printf("is_private_keypad_key = %d\n", xcb_is_private_keypad_key(sym));
398 printf("xcb_is_cursor_key = %d\n", xcb_is_cursor_key(sym));
399 printf("xcb_is_pf_key = %d\n", xcb_is_pf_key(sym));
400 printf("xcb_is_function_key = %d\n", xcb_is_function_key(sym));
401 printf("xcb_is_misc_function_key = %d\n", xcb_is_misc_function_key(sym));
402 printf("xcb_is_modifier_key = %d\n", xcb_is_modifier_key(sym));
408 /* store it in the password array as UTF-8 */
409 memcpy(password+input_position, buffer, n-1);
410 input_position += n-1;
411 DEBUG("current password = %.*s\n", input_position, password);
413 unlock_state = STATE_KEY_ACTIVE;
415 unlock_state = STATE_KEY_PRESSED;
417 struct ev_timer *timeout = calloc(sizeof(struct ev_timer), 1);
419 ev_timer_init(timeout, redraw_timeout, 0.25, 0.);
420 ev_timer_start(main_loop, timeout);
423 STOP_TIMER(clear_indicator_timeout);
424 START_TIMER(discard_passwd_timeout, TSTAMP_N_MINS(3), discard_passwd_cb);
428 * A visibility notify event will be received when the visibility (= can the
429 * user view the complete window) changes, so for example when a popup overlays
430 * some area of the i3lock window.
432 * In this case, we raise our window on top so that the popup (or whatever is
433 * hiding us) gets hidden.
436 static void handle_visibility_notify(xcb_connection_t *conn,
437 xcb_visibility_notify_event_t *event) {
438 if (event->state != XCB_VISIBILITY_UNOBSCURED) {
439 uint32_t values[] = { XCB_STACK_MODE_ABOVE };
440 xcb_configure_window(conn, event->window, XCB_CONFIG_WINDOW_STACK_MODE, values);
446 * Called when the keyboard mapping changes. We update our symbols.
449 static void handle_mapping_notify(xcb_mapping_notify_event_t *event) {
450 /* We ignore errors — if the new keymap cannot be loaded it’s better if the
451 * screen stays locked and the user intervenes by using killall i3lock. */
456 * Called when the properties on the root window change, e.g. when the screen
457 * resolution changes. If so we update the window to cover the whole screen
458 * and also redraw the image, if any.
461 void handle_screen_resize(void) {
462 xcb_get_geometry_cookie_t geomc;
463 xcb_get_geometry_reply_t *geom;
464 geomc = xcb_get_geometry(conn, screen->root);
465 if ((geom = xcb_get_geometry_reply(conn, geomc, 0)) == NULL)
468 if (last_resolution[0] == geom->width &&
469 last_resolution[1] == geom->height) {
474 last_resolution[0] = geom->width;
475 last_resolution[1] = geom->height;
481 uint32_t mask = XCB_CONFIG_WINDOW_WIDTH | XCB_CONFIG_WINDOW_HEIGHT;
482 xcb_configure_window(conn, win, mask, last_resolution);
485 xinerama_query_screens();
490 * Callback function for PAM. We only react on password request callbacks.
493 static int conv_callback(int num_msg, const struct pam_message **msg,
494 struct pam_response **resp, void *appdata_ptr)
499 /* PAM expects an array of responses, one for each message */
500 if ((*resp = calloc(num_msg, sizeof(struct pam_response))) == NULL) {
505 for (int c = 0; c < num_msg; c++) {
506 if (msg[c]->msg_style != PAM_PROMPT_ECHO_OFF &&
507 msg[c]->msg_style != PAM_PROMPT_ECHO_ON)
510 /* return code is currently not used but should be set to zero */
511 resp[c]->resp_retcode = 0;
512 if ((resp[c]->resp = strdup(password)) == NULL) {
522 * This callback is only a dummy, see xcb_prepare_cb and xcb_check_cb.
523 * See also man libev(3): "ev_prepare" and "ev_check" - customise your event loop
526 static void xcb_got_event(EV_P_ struct ev_io *w, int revents) {
527 /* empty, because xcb_prepare_cb and xcb_check_cb are used */
531 * Flush before blocking (and waiting for new events)
534 static void xcb_prepare_cb(EV_P_ ev_prepare *w, int revents) {
539 * Instead of polling the X connection socket we leave this to
540 * xcb_poll_for_event() which knows better than we can ever know.
543 static void xcb_check_cb(EV_P_ ev_check *w, int revents) {
544 xcb_generic_event_t *event;
546 while ((event = xcb_poll_for_event(conn)) != NULL) {
547 if (event->response_type == 0) {
548 xcb_generic_error_t *error = (xcb_generic_error_t*)event;
550 fprintf(stderr, "X11 Error received! sequence 0x%x, error_code = %d\n",
551 error->sequence, error->error_code);
556 /* Strip off the highest bit (set if the event is generated) */
557 int type = (event->response_type & 0x7F);
560 handle_key_press((xcb_key_press_event_t*)event);
563 case XCB_KEY_RELEASE:
564 handle_key_release((xcb_key_release_event_t*)event);
566 /* If this was the backspace or escape key we are back at an
567 * empty input, so turn off the screen if DPMS is enabled, but
568 * only do that after some timeout: maybe user mistyped and
569 * will type again right away */
570 START_TIMER(dpms_timeout, TSTAMP_N_SECS(inactivity_timeout),
571 turn_off_monitors_cb);
574 case XCB_VISIBILITY_NOTIFY:
575 handle_visibility_notify(conn, (xcb_visibility_notify_event_t*)event);
580 /* After the first MapNotify, we never fork again. We don’t
581 * expect to get another MapNotify, but better be sure… */
584 /* In the parent process, we exit */
588 ev_loop_fork(EV_DEFAULT);
592 case XCB_MAPPING_NOTIFY:
593 handle_mapping_notify((xcb_mapping_notify_event_t*)event);
596 case XCB_CONFIGURE_NOTIFY:
597 handle_screen_resize();
606 * This function is called from a fork()ed child and will raise the i3lock
607 * window when the window is obscured, even when the main i3lock process is
608 * blocked due to PAM.
611 static void raise_loop(xcb_window_t window) {
612 xcb_connection_t *conn;
613 xcb_generic_event_t *event;
616 if ((conn = xcb_connect(NULL, &screens)) == NULL ||
617 xcb_connection_has_error(conn))
618 errx(EXIT_FAILURE, "Cannot open display\n");
620 /* We need to know about the window being obscured or getting destroyed. */
621 xcb_change_window_attributes(conn, window, XCB_CW_EVENT_MASK,
623 XCB_EVENT_MASK_VISIBILITY_CHANGE |
624 XCB_EVENT_MASK_STRUCTURE_NOTIFY
628 DEBUG("Watching window 0x%08x\n", window);
629 while ((event = xcb_wait_for_event(conn)) != NULL) {
630 if (event->response_type == 0) {
631 xcb_generic_error_t *error = (xcb_generic_error_t*)event;
632 DEBUG("X11 Error received! sequence 0x%x, error_code = %d\n",
633 error->sequence, error->error_code);
637 /* Strip off the highest bit (set if the event is generated) */
638 int type = (event->response_type & 0x7F);
639 DEBUG("Read event of type %d\n", type);
641 case XCB_VISIBILITY_NOTIFY:
642 handle_visibility_notify(conn, (xcb_visibility_notify_event_t*)event);
644 case XCB_UNMAP_NOTIFY:
645 DEBUG("UnmapNotify for 0x%08x\n", (((xcb_unmap_notify_event_t*)event)->window));
646 if (((xcb_unmap_notify_event_t*)event)->window == window)
649 case XCB_DESTROY_NOTIFY:
650 DEBUG("DestroyNotify for 0x%08x\n", (((xcb_destroy_notify_event_t*)event)->window));
651 if (((xcb_destroy_notify_event_t*)event)->window == window)
655 DEBUG("Unhandled event type %d\n", type);
662 int main(int argc, char *argv[]) {
664 char *image_path = NULL;
666 struct pam_conv conv = {conv_callback, NULL};
667 int curs_choice = CURS_NONE;
670 struct option longopts[] = {
671 {"version", no_argument, NULL, 'v'},
672 {"nofork", no_argument, NULL, 'n'},
673 {"beep", no_argument, NULL, 'b'},
674 {"dpms", no_argument, NULL, 'd'},
675 {"color", required_argument, NULL, 'c'},
676 {"pointer", required_argument, NULL , 'p'},
677 {"debug", no_argument, NULL, 0},
678 {"help", no_argument, NULL, 'h'},
679 {"no-unlock-indicator", no_argument, NULL, 'u'},
680 {"image", required_argument, NULL, 'i'},
681 {"tiling", no_argument, NULL, 't'},
682 {"ignore-empty-password", no_argument, NULL, 'e'},
683 {"inactivity-timeout", required_argument, NULL, 'I'},
684 {NULL, no_argument, NULL, 0}
687 if ((username = getenv("USER")) == NULL)
688 errx(EXIT_FAILURE, "USER environment variable not set, please set it.\n");
690 char *optstring = "hvnbdc:p:ui:teI:";
691 while ((o = getopt_long(argc, argv, optstring, longopts, &optind)) != -1) {
694 errx(EXIT_SUCCESS, "version " VERSION " © 2010-2012 Michael Stapelberg");
706 if (sscanf(optarg, "%d", &time) != 1 || time < 0)
707 errx(EXIT_FAILURE, "invalid timeout, it must be a positive integer\n");
708 inactivity_timeout = time;
714 /* Skip # if present */
718 if (strlen(arg) != 6 || sscanf(arg, "%06[0-9a-fA-F]", color) != 1)
719 errx(EXIT_FAILURE, "color is invalid, it must be given in 3-byte hexadecimal format: rrggbb\n");
724 unlock_indicator = false;
727 image_path = strdup(optarg);
733 if (!strcmp(optarg, "win")) {
734 curs_choice = CURS_WIN;
735 } else if (!strcmp(optarg, "default")) {
736 curs_choice = CURS_DEFAULT;
738 errx(EXIT_FAILURE, "i3lock: Invalid pointer type given. Expected one of \"win\" or \"default\".\n");
742 ignore_empty_password = true;
745 if (strcmp(longopts[optind].name, "debug") == 0)
749 errx(EXIT_FAILURE, "Syntax: i3lock [-v] [-n] [-b] [-d] [-c color] [-u] [-p win|default]"
750 " [-i image.png] [-t] [-e] [-I]"
755 /* We need (relatively) random numbers for highlighting a random part of
756 * the unlock indicator upon keypresses. */
760 ret = pam_start("i3lock", username, &conv, &pam_handle);
761 if (ret != PAM_SUCCESS)
762 errx(EXIT_FAILURE, "PAM: %s", pam_strerror(pam_handle, ret));
764 /* Using mlock() as non-super-user seems only possible in Linux. Users of other
765 * operating systems should use encrypted swap/no swap (or remove the ifdef and
766 * run i3lock as super-user). */
767 #if defined(__linux__)
768 /* Lock the area where we store the password in memory, we don’t want it to
769 * be swapped to disk. Since Linux 2.6.9, this does not require any
770 * privileges, just enough bytes in the RLIMIT_MEMLOCK limit. */
771 if (mlock(password, sizeof(password)) != 0)
772 err(EXIT_FAILURE, "Could not lock page in memory, check RLIMIT_MEMLOCK");
775 /* Initialize connection to X11 */
776 if ((display = XOpenDisplay(NULL)) == NULL)
777 errx(EXIT_FAILURE, "Could not connect to X11, maybe you need to set DISPLAY?");
778 XSetEventQueueOwner(display, XCBOwnsEventQueue);
779 conn = XGetXCBConnection(display);
781 /* Double checking that connection is good and operatable with xcb */
782 if (xcb_connection_has_error(conn))
783 errx(EXIT_FAILURE, "Could not connect to X11, maybe you need to set DISPLAY?");
785 /* When we cannot initially load the keymap, we better exit */
787 errx(EXIT_FAILURE, "Could not load keymap");
790 xinerama_query_screens();
792 /* if DPMS is enabled, check if the X server really supports it */
794 xcb_dpms_capable_cookie_t dpmsc = xcb_dpms_capable(conn);
795 xcb_dpms_capable_reply_t *dpmsr;
796 if ((dpmsr = xcb_dpms_capable_reply(conn, dpmsc, NULL))) {
797 if (!dpmsr->capable) {
799 fprintf(stderr, "Disabling DPMS, X server not DPMS capable\n");
806 screen = xcb_setup_roots_iterator(xcb_get_setup(conn)).data;
808 last_resolution[0] = screen->width_in_pixels;
809 last_resolution[1] = screen->height_in_pixels;
811 xcb_change_window_attributes(conn, screen->root, XCB_CW_EVENT_MASK,
812 (uint32_t[]){ XCB_EVENT_MASK_STRUCTURE_NOTIFY });
815 /* Create a pixmap to render on, fill it with the background color */
816 img = cairo_image_surface_create_from_png(image_path);
817 /* In case loading failed, we just pretend no -i was specified. */
818 if (cairo_surface_status(img) != CAIRO_STATUS_SUCCESS) {
819 fprintf(stderr, "Could not load image \"%s\": %s\n",
820 image_path, cairo_status_to_string(cairo_surface_status(img)));
825 /* Pixmap on which the image is rendered to (if any) */
826 xcb_pixmap_t bg_pixmap = draw_image(last_resolution);
828 /* open the fullscreen window, already with the correct pixmap in place */
829 win = open_fullscreen_window(conn, screen, color, bg_pixmap);
830 xcb_free_pixmap(conn, bg_pixmap);
833 /* The pid == -1 case is intentionally ignored here:
834 * While the child process is useful for preventing other windows from
835 * popping up while i3lock blocks, it is not critical. */
838 close(xcb_get_file_descriptor(conn));
843 cursor = create_cursor(conn, screen, win, curs_choice);
845 grab_pointer_and_keyboard(conn, screen, cursor);
846 /* Load the keymap again to sync the current modifier state. Since we first
847 * loaded the keymap, there might have been changes, but starting from now,
848 * we should get all key presses/releases due to having grabbed the
854 /* Initialize the libev event loop. */
855 main_loop = EV_DEFAULT;
856 if (main_loop == NULL)
857 errx(EXIT_FAILURE, "Could not initialize libev. Bad LIBEV_FLAGS?\n");
859 struct ev_io *xcb_watcher = calloc(sizeof(struct ev_io), 1);
860 struct ev_check *xcb_check = calloc(sizeof(struct ev_check), 1);
861 struct ev_prepare *xcb_prepare = calloc(sizeof(struct ev_prepare), 1);
863 ev_io_init(xcb_watcher, xcb_got_event, xcb_get_file_descriptor(conn), EV_READ);
864 ev_io_start(main_loop, xcb_watcher);
866 ev_check_init(xcb_check, xcb_check_cb);
867 ev_check_start(main_loop, xcb_check);
869 ev_prepare_init(xcb_prepare, xcb_prepare_cb);
870 ev_prepare_start(main_loop, xcb_prepare);
872 /* Invoke the event callback once to catch all the events which were
873 * received up until now. ev will only pick up new events (when the X11
874 * file descriptor becomes readable). */
875 ev_invoke(main_loop, xcb_check, 0);
876 ev_loop(main_loop, 0);