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;
77 bool skip_repeated_empty_password = false;
79 /* isutf, u8_dec © 2005 Jeff Bezanson, public domain */
80 #define isutf(c) (((c) & 0xC0) != 0x80)
83 * Decrements i to point to the previous unicode glyph
86 void u8_dec(char *s, int *i) {
87 (void)(isutf(s[--(*i)]) || isutf(s[--(*i)]) || isutf(s[--(*i)]) || --(*i));
90 static void turn_monitors_on(void) {
92 dpms_set_mode(conn, XCB_DPMS_DPMS_MODE_ON);
95 static void turn_monitors_off(void) {
97 dpms_set_mode(conn, XCB_DPMS_DPMS_MODE_OFF);
101 * Loads the XKB keymap from the X11 server and feeds it to xkbcommon.
102 * Necessary so that we can properly let xkbcommon track the keyboard state and
103 * translate keypresses to utf-8.
105 * Ideally, xkbcommon would ship something like this itself, but as of now
106 * (version 0.2.0), it doesn’t.
108 * TODO: Once xcb-xkb is enabled by default and released, we should port this
109 * code to xcb-xkb. See also https://github.com/xkbcommon/libxkbcommon/issues/1
112 static bool load_keymap(void) {
115 memset(&result, '\0', sizeof(result));
116 result.xkb = XkbGetKeyboard(display, XkbAllMapComponentsMask, XkbUseCoreKbd);
117 if (result.xkb == NULL) {
118 fprintf(stderr, "[i3lock] XKB: XkbGetKeyboard failed\n");
122 FILE *temp = tmpfile();
124 fprintf(stderr, "[i3lock] could not create tempfile\n");
128 bool ok = XkbWriteXKBKeymap(temp, &result, false, false, NULL, NULL);
130 fprintf(stderr, "[i3lock] XkbWriteXKBKeymap failed\n");
136 if (xkb_context == NULL) {
137 if ((xkb_context = xkb_context_new(0)) == NULL) {
138 fprintf(stderr, "[i3lock] could not create xkbcommon context\n");
143 if (xkb_keymap != NULL)
144 xkb_keymap_unref(xkb_keymap);
146 if ((xkb_keymap = xkb_keymap_new_from_file(xkb_context, temp, XKB_KEYMAP_FORMAT_TEXT_V1, 0)) == NULL) {
147 fprintf(stderr, "[i3lock] xkb_keymap_new_from_file failed\n");
151 struct xkb_state *new_state = xkb_state_new(xkb_keymap);
152 if (new_state == NULL) {
153 fprintf(stderr, "[i3lock] xkb_state_new failed\n");
157 /* Get the initial modifier state to be in sync with the X server.
158 * See https://github.com/xkbcommon/libxkbcommon/issues/1 for why we ignore
159 * the base and latched fields. */
160 XkbStateRec state_rec;
161 XkbGetState(display, XkbUseCoreKbd, &state_rec);
163 xkb_state_update_mask(new_state,
164 0, 0, state_rec.locked_mods,
165 0, 0, state_rec.locked_group);
167 if (xkb_state != NULL)
168 xkb_state_unref(xkb_state);
169 xkb_state = new_state;
173 XkbFreeKeyboard(result.xkb, XkbAllComponentsMask, true);
179 * Clears the memory which stored the password to be a bit safer against
183 static void clear_password_memory(void) {
184 /* A volatile pointer to the password buffer to prevent the compiler from
185 * optimizing this out. */
186 volatile char *vpassword = password;
187 for (int c = 0; c < sizeof(password); c++)
188 /* We store a non-random pattern which consists of the (irrelevant)
189 * index plus (!) the value of the beep variable. This prevents the
190 * compiler from optimizing the calls away, since the value of 'beep'
191 * is not known at compile-time. */
192 vpassword[c] = c + (int)beep;
195 ev_timer* start_timer(ev_timer *timer_obj, ev_tstamp timeout, ev_callback_t callback) {
197 ev_timer_stop(main_loop, timer_obj);
198 ev_timer_set(timer_obj, timeout, 0.);
199 ev_timer_start(main_loop, timer_obj);
201 /* When there is no memory, we just don’t have a timeout. We cannot
202 * exit() here, since that would effectively unlock the screen. */
203 timer_obj = calloc(sizeof(struct ev_timer), 1);
205 ev_timer_init(timer_obj, callback, timeout, 0.);
206 ev_timer_start(main_loop, timer_obj);
212 ev_timer* stop_timer(ev_timer *timer_obj) {
214 ev_timer_stop(main_loop, timer_obj);
221 * Resets pam_state to STATE_PAM_IDLE 2 seconds after an unsuccessful
222 * authentication event.
225 static void clear_pam_wrong(EV_P_ ev_timer *w, int revents) {
226 DEBUG("clearing pam wrong\n");
227 pam_state = STATE_PAM_IDLE;
228 unlock_state = STATE_STARTED;
231 /* Now free this timeout. */
232 ev_timer_stop(main_loop, clear_pam_wrong_timeout);
233 free(clear_pam_wrong_timeout);
234 clear_pam_wrong_timeout = NULL;
237 static void clear_indicator_cb(EV_P_ ev_timer *w, int revents) {
239 STOP_TIMER(clear_indicator_timeout);
242 static void clear_input(void) {
244 clear_password_memory();
245 password[input_position] = '\0';
247 /* Hide the unlock indicator after a bit if the password buffer is
249 START_TIMER(clear_indicator_timeout, 1.0, clear_indicator_cb);
250 unlock_state = STATE_BACKSPACE_ACTIVE;
252 unlock_state = STATE_KEY_PRESSED;
255 static void turn_off_monitors_cb(EV_P_ ev_timer *w, int revents) {
256 if (input_position == 0)
259 STOP_TIMER(dpms_timeout);
262 static void discard_passwd_cb(EV_P_ ev_timer *w, int revents) {
265 STOP_TIMER(discard_passwd_timeout);
268 static void input_done(void) {
269 if (clear_pam_wrong_timeout) {
270 ev_timer_stop(main_loop, clear_pam_wrong_timeout);
271 free(clear_pam_wrong_timeout);
272 clear_pam_wrong_timeout = NULL;
275 pam_state = STATE_PAM_VERIFY;
278 if (pam_authenticate(pam_handle, 0) == PAM_SUCCESS) {
279 DEBUG("successfully authenticated\n");
280 clear_password_memory();
281 /* Turn the screen on, as it may have been turned off
282 * on release of the 'enter' key. */
288 fprintf(stderr, "Authentication failure\n");
290 pam_state = STATE_PAM_WRONG;
294 /* Clear this state after 2 seconds (unless the user enters another
295 * password during that time). */
296 ev_now_update(main_loop);
297 if ((clear_pam_wrong_timeout = calloc(sizeof(struct ev_timer), 1))) {
298 ev_timer_init(clear_pam_wrong_timeout, clear_pam_wrong, 2.0, 0.);
299 ev_timer_start(main_loop, clear_pam_wrong_timeout);
302 /* Cancel the clear_indicator_timeout, it would hide the unlock indicator
304 STOP_TIMER(clear_indicator_timeout);
306 /* beep on authentication failure, if enabled */
314 * Called when the user releases a key. We need to leave the Mode_switch
315 * state when the user releases the Mode_switch key.
318 static void handle_key_release(xcb_key_release_event_t *event) {
319 xkb_state_update_key(xkb_state, event->detail, XKB_KEY_UP);
322 static void redraw_timeout(EV_P_ ev_timer *w, int revents) {
325 ev_timer_stop(main_loop, w);
329 static bool skip_without_validation(void) {
330 if (input_position != 0)
333 if (skip_repeated_empty_password || ignore_empty_password)
340 * Handle key presses. Fixes state, then looks up the key symbol for the
341 * given keycode, then looks up the key symbol (as UCS-2), converts it to
342 * UTF-8 and stores it in the password array.
345 static void handle_key_press(xcb_key_press_event_t *event) {
351 ksym = xkb_state_key_get_one_sym(xkb_state, event->detail);
352 ctrl = xkb_state_mod_name_is_active(xkb_state, "Control", XKB_STATE_MODS_DEPRESSED);
353 xkb_state_update_key(xkb_state, event->detail, XKB_KEY_DOWN);
355 /* The buffer will be null-terminated, so n >= 2 for 1 actual character. */
356 memset(buffer, '\0', sizeof(buffer));
357 n = xkb_keysym_to_utf8(ksym, buffer, sizeof(buffer));
361 case XKB_KEY_KP_Enter:
362 case XKB_KEY_XF86ScreenSaver:
363 if (skip_without_validation()) {
367 password[input_position] = '\0';
368 unlock_state = STATE_KEY_PRESSED;
371 skip_repeated_empty_password = true;
374 skip_repeated_empty_password = false;
380 DEBUG("C-u pressed\n");
390 case XKB_KEY_BackSpace:
391 if (input_position == 0)
394 /* decrement input_position to point to the previous glyph */
395 u8_dec(password, &input_position);
396 password[input_position] = '\0';
398 /* Hide the unlock indicator after a bit if the password buffer is
400 START_TIMER(clear_indicator_timeout, 1.0, clear_indicator_cb);
401 unlock_state = STATE_BACKSPACE_ACTIVE;
403 unlock_state = STATE_KEY_PRESSED;
407 if ((input_position + 8) >= sizeof(password))
411 /* FIXME: handle all of these? */
412 printf("is_keypad_key = %d\n", xcb_is_keypad_key(sym));
413 printf("is_private_keypad_key = %d\n", xcb_is_private_keypad_key(sym));
414 printf("xcb_is_cursor_key = %d\n", xcb_is_cursor_key(sym));
415 printf("xcb_is_pf_key = %d\n", xcb_is_pf_key(sym));
416 printf("xcb_is_function_key = %d\n", xcb_is_function_key(sym));
417 printf("xcb_is_misc_function_key = %d\n", xcb_is_misc_function_key(sym));
418 printf("xcb_is_modifier_key = %d\n", xcb_is_modifier_key(sym));
424 /* store it in the password array as UTF-8 */
425 memcpy(password+input_position, buffer, n-1);
426 input_position += n-1;
427 DEBUG("current password = %.*s\n", input_position, password);
429 unlock_state = STATE_KEY_ACTIVE;
431 unlock_state = STATE_KEY_PRESSED;
433 struct ev_timer *timeout = calloc(sizeof(struct ev_timer), 1);
435 ev_timer_init(timeout, redraw_timeout, 0.25, 0.);
436 ev_timer_start(main_loop, timeout);
439 STOP_TIMER(clear_indicator_timeout);
440 START_TIMER(discard_passwd_timeout, TSTAMP_N_MINS(3), discard_passwd_cb);
444 * A visibility notify event will be received when the visibility (= can the
445 * user view the complete window) changes, so for example when a popup overlays
446 * some area of the i3lock window.
448 * In this case, we raise our window on top so that the popup (or whatever is
449 * hiding us) gets hidden.
452 static void handle_visibility_notify(xcb_connection_t *conn,
453 xcb_visibility_notify_event_t *event) {
454 if (event->state != XCB_VISIBILITY_UNOBSCURED) {
455 uint32_t values[] = { XCB_STACK_MODE_ABOVE };
456 xcb_configure_window(conn, event->window, XCB_CONFIG_WINDOW_STACK_MODE, values);
462 * Called when the keyboard mapping changes. We update our symbols.
465 static void handle_mapping_notify(xcb_mapping_notify_event_t *event) {
466 /* We ignore errors — if the new keymap cannot be loaded it’s better if the
467 * screen stays locked and the user intervenes by using killall i3lock. */
472 * Called when the properties on the root window change, e.g. when the screen
473 * resolution changes. If so we update the window to cover the whole screen
474 * and also redraw the image, if any.
477 void handle_screen_resize(void) {
478 xcb_get_geometry_cookie_t geomc;
479 xcb_get_geometry_reply_t *geom;
480 geomc = xcb_get_geometry(conn, screen->root);
481 if ((geom = xcb_get_geometry_reply(conn, geomc, 0)) == NULL)
484 if (last_resolution[0] == geom->width &&
485 last_resolution[1] == geom->height) {
490 last_resolution[0] = geom->width;
491 last_resolution[1] = geom->height;
497 uint32_t mask = XCB_CONFIG_WINDOW_WIDTH | XCB_CONFIG_WINDOW_HEIGHT;
498 xcb_configure_window(conn, win, mask, last_resolution);
501 xinerama_query_screens();
506 * Callback function for PAM. We only react on password request callbacks.
509 static int conv_callback(int num_msg, const struct pam_message **msg,
510 struct pam_response **resp, void *appdata_ptr)
515 /* PAM expects an array of responses, one for each message */
516 if ((*resp = calloc(num_msg, sizeof(struct pam_response))) == NULL) {
521 for (int c = 0; c < num_msg; c++) {
522 if (msg[c]->msg_style != PAM_PROMPT_ECHO_OFF &&
523 msg[c]->msg_style != PAM_PROMPT_ECHO_ON)
526 /* return code is currently not used but should be set to zero */
527 resp[c]->resp_retcode = 0;
528 if ((resp[c]->resp = strdup(password)) == NULL) {
538 * This callback is only a dummy, see xcb_prepare_cb and xcb_check_cb.
539 * See also man libev(3): "ev_prepare" and "ev_check" - customise your event loop
542 static void xcb_got_event(EV_P_ struct ev_io *w, int revents) {
543 /* empty, because xcb_prepare_cb and xcb_check_cb are used */
547 * Flush before blocking (and waiting for new events)
550 static void xcb_prepare_cb(EV_P_ ev_prepare *w, int revents) {
555 * Instead of polling the X connection socket we leave this to
556 * xcb_poll_for_event() which knows better than we can ever know.
559 static void xcb_check_cb(EV_P_ ev_check *w, int revents) {
560 xcb_generic_event_t *event;
562 while ((event = xcb_poll_for_event(conn)) != NULL) {
563 if (event->response_type == 0) {
564 xcb_generic_error_t *error = (xcb_generic_error_t*)event;
566 fprintf(stderr, "X11 Error received! sequence 0x%x, error_code = %d\n",
567 error->sequence, error->error_code);
572 /* Strip off the highest bit (set if the event is generated) */
573 int type = (event->response_type & 0x7F);
576 handle_key_press((xcb_key_press_event_t*)event);
579 case XCB_KEY_RELEASE:
580 handle_key_release((xcb_key_release_event_t*)event);
582 /* If this was the backspace or escape key we are back at an
583 * empty input, so turn off the screen if DPMS is enabled, but
584 * only do that after some timeout: maybe user mistyped and
585 * will type again right away */
586 START_TIMER(dpms_timeout, TSTAMP_N_SECS(inactivity_timeout),
587 turn_off_monitors_cb);
590 case XCB_VISIBILITY_NOTIFY:
591 handle_visibility_notify(conn, (xcb_visibility_notify_event_t*)event);
596 /* After the first MapNotify, we never fork again. We don’t
597 * expect to get another MapNotify, but better be sure… */
600 /* In the parent process, we exit */
604 ev_loop_fork(EV_DEFAULT);
608 case XCB_MAPPING_NOTIFY:
609 handle_mapping_notify((xcb_mapping_notify_event_t*)event);
612 case XCB_CONFIGURE_NOTIFY:
613 handle_screen_resize();
622 * This function is called from a fork()ed child and will raise the i3lock
623 * window when the window is obscured, even when the main i3lock process is
624 * blocked due to PAM.
627 static void raise_loop(xcb_window_t window) {
628 xcb_connection_t *conn;
629 xcb_generic_event_t *event;
632 if ((conn = xcb_connect(NULL, &screens)) == NULL ||
633 xcb_connection_has_error(conn))
634 errx(EXIT_FAILURE, "Cannot open display\n");
636 /* We need to know about the window being obscured or getting destroyed. */
637 xcb_change_window_attributes(conn, window, XCB_CW_EVENT_MASK,
639 XCB_EVENT_MASK_VISIBILITY_CHANGE |
640 XCB_EVENT_MASK_STRUCTURE_NOTIFY
644 DEBUG("Watching window 0x%08x\n", window);
645 while ((event = xcb_wait_for_event(conn)) != NULL) {
646 if (event->response_type == 0) {
647 xcb_generic_error_t *error = (xcb_generic_error_t*)event;
648 DEBUG("X11 Error received! sequence 0x%x, error_code = %d\n",
649 error->sequence, error->error_code);
653 /* Strip off the highest bit (set if the event is generated) */
654 int type = (event->response_type & 0x7F);
655 DEBUG("Read event of type %d\n", type);
657 case XCB_VISIBILITY_NOTIFY:
658 handle_visibility_notify(conn, (xcb_visibility_notify_event_t*)event);
660 case XCB_UNMAP_NOTIFY:
661 DEBUG("UnmapNotify for 0x%08x\n", (((xcb_unmap_notify_event_t*)event)->window));
662 if (((xcb_unmap_notify_event_t*)event)->window == window)
665 case XCB_DESTROY_NOTIFY:
666 DEBUG("DestroyNotify for 0x%08x\n", (((xcb_destroy_notify_event_t*)event)->window));
667 if (((xcb_destroy_notify_event_t*)event)->window == window)
671 DEBUG("Unhandled event type %d\n", type);
678 int main(int argc, char *argv[]) {
680 char *image_path = NULL;
682 struct pam_conv conv = {conv_callback, NULL};
683 int curs_choice = CURS_NONE;
686 struct option longopts[] = {
687 {"version", no_argument, NULL, 'v'},
688 {"nofork", no_argument, NULL, 'n'},
689 {"beep", no_argument, NULL, 'b'},
690 {"dpms", no_argument, NULL, 'd'},
691 {"color", required_argument, NULL, 'c'},
692 {"pointer", required_argument, NULL , 'p'},
693 {"debug", no_argument, NULL, 0},
694 {"help", no_argument, NULL, 'h'},
695 {"no-unlock-indicator", no_argument, NULL, 'u'},
696 {"image", required_argument, NULL, 'i'},
697 {"tiling", no_argument, NULL, 't'},
698 {"ignore-empty-password", no_argument, NULL, 'e'},
699 {"inactivity-timeout", required_argument, NULL, 'I'},
700 {NULL, no_argument, NULL, 0}
703 if ((username = getenv("USER")) == NULL)
704 errx(EXIT_FAILURE, "USER environment variable not set, please set it.\n");
706 char *optstring = "hvnbdc:p:ui:teI:";
707 while ((o = getopt_long(argc, argv, optstring, longopts, &optind)) != -1) {
710 errx(EXIT_SUCCESS, "version " VERSION " © 2010-2012 Michael Stapelberg");
722 if (sscanf(optarg, "%d", &time) != 1 || time < 0)
723 errx(EXIT_FAILURE, "invalid timeout, it must be a positive integer\n");
724 inactivity_timeout = time;
730 /* Skip # if present */
734 if (strlen(arg) != 6 || sscanf(arg, "%06[0-9a-fA-F]", color) != 1)
735 errx(EXIT_FAILURE, "color is invalid, it must be given in 3-byte hexadecimal format: rrggbb\n");
740 unlock_indicator = false;
743 image_path = strdup(optarg);
749 if (!strcmp(optarg, "win")) {
750 curs_choice = CURS_WIN;
751 } else if (!strcmp(optarg, "default")) {
752 curs_choice = CURS_DEFAULT;
754 errx(EXIT_FAILURE, "i3lock: Invalid pointer type given. Expected one of \"win\" or \"default\".\n");
758 ignore_empty_password = true;
761 if (strcmp(longopts[optind].name, "debug") == 0)
765 errx(EXIT_FAILURE, "Syntax: i3lock [-v] [-n] [-b] [-d] [-c color] [-u] [-p win|default]"
766 " [-i image.png] [-t] [-e] [-I]"
771 /* We need (relatively) random numbers for highlighting a random part of
772 * the unlock indicator upon keypresses. */
776 ret = pam_start("i3lock", username, &conv, &pam_handle);
777 if (ret != PAM_SUCCESS)
778 errx(EXIT_FAILURE, "PAM: %s", pam_strerror(pam_handle, ret));
780 /* Using mlock() as non-super-user seems only possible in Linux. Users of other
781 * operating systems should use encrypted swap/no swap (or remove the ifdef and
782 * run i3lock as super-user). */
783 #if defined(__linux__)
784 /* Lock the area where we store the password in memory, we don’t want it to
785 * be swapped to disk. Since Linux 2.6.9, this does not require any
786 * privileges, just enough bytes in the RLIMIT_MEMLOCK limit. */
787 if (mlock(password, sizeof(password)) != 0)
788 err(EXIT_FAILURE, "Could not lock page in memory, check RLIMIT_MEMLOCK");
791 /* Initialize connection to X11 */
792 if ((display = XOpenDisplay(NULL)) == NULL)
793 errx(EXIT_FAILURE, "Could not connect to X11, maybe you need to set DISPLAY?");
794 XSetEventQueueOwner(display, XCBOwnsEventQueue);
795 conn = XGetXCBConnection(display);
797 /* Double checking that connection is good and operatable with xcb */
798 if (xcb_connection_has_error(conn))
799 errx(EXIT_FAILURE, "Could not connect to X11, maybe you need to set DISPLAY?");
801 /* When we cannot initially load the keymap, we better exit */
803 errx(EXIT_FAILURE, "Could not load keymap");
806 xinerama_query_screens();
808 /* if DPMS is enabled, check if the X server really supports it */
810 xcb_dpms_capable_cookie_t dpmsc = xcb_dpms_capable(conn);
811 xcb_dpms_capable_reply_t *dpmsr;
812 if ((dpmsr = xcb_dpms_capable_reply(conn, dpmsc, NULL))) {
813 if (!dpmsr->capable) {
815 fprintf(stderr, "Disabling DPMS, X server not DPMS capable\n");
822 screen = xcb_setup_roots_iterator(xcb_get_setup(conn)).data;
824 last_resolution[0] = screen->width_in_pixels;
825 last_resolution[1] = screen->height_in_pixels;
827 xcb_change_window_attributes(conn, screen->root, XCB_CW_EVENT_MASK,
828 (uint32_t[]){ XCB_EVENT_MASK_STRUCTURE_NOTIFY });
831 /* Create a pixmap to render on, fill it with the background color */
832 img = cairo_image_surface_create_from_png(image_path);
833 /* In case loading failed, we just pretend no -i was specified. */
834 if (cairo_surface_status(img) != CAIRO_STATUS_SUCCESS) {
835 fprintf(stderr, "Could not load image \"%s\": %s\n",
836 image_path, cairo_status_to_string(cairo_surface_status(img)));
841 /* Pixmap on which the image is rendered to (if any) */
842 xcb_pixmap_t bg_pixmap = draw_image(last_resolution);
844 /* open the fullscreen window, already with the correct pixmap in place */
845 win = open_fullscreen_window(conn, screen, color, bg_pixmap);
846 xcb_free_pixmap(conn, bg_pixmap);
849 /* The pid == -1 case is intentionally ignored here:
850 * While the child process is useful for preventing other windows from
851 * popping up while i3lock blocks, it is not critical. */
854 close(xcb_get_file_descriptor(conn));
859 cursor = create_cursor(conn, screen, win, curs_choice);
861 grab_pointer_and_keyboard(conn, screen, cursor);
862 /* Load the keymap again to sync the current modifier state. Since we first
863 * loaded the keymap, there might have been changes, but starting from now,
864 * we should get all key presses/releases due to having grabbed the
870 /* Initialize the libev event loop. */
871 main_loop = EV_DEFAULT;
872 if (main_loop == NULL)
873 errx(EXIT_FAILURE, "Could not initialize libev. Bad LIBEV_FLAGS?\n");
875 struct ev_io *xcb_watcher = calloc(sizeof(struct ev_io), 1);
876 struct ev_check *xcb_check = calloc(sizeof(struct ev_check), 1);
877 struct ev_prepare *xcb_prepare = calloc(sizeof(struct ev_prepare), 1);
879 ev_io_init(xcb_watcher, xcb_got_event, xcb_get_file_descriptor(conn), EV_READ);
880 ev_io_start(main_loop, xcb_watcher);
882 ev_check_init(xcb_check, xcb_check_cb);
883 ev_check_start(main_loop, xcb_check);
885 ev_prepare_init(xcb_prepare, xcb_prepare_cb);
886 ev_prepare_start(main_loop, xcb_prepare);
888 /* Invoke the event callback once to catch all the events which were
889 * received up until now. ev will only pick up new events (when the X11
890 * file descriptor becomes readable). */
891 ev_invoke(main_loop, xcb_check, 0);
892 ev_loop(main_loop, 0);