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 START_TIMER(timer_obj, timeout, callback) \
39 timer_obj = start_timer(timer_obj, timeout, callback)
40 #define STOP_TIMER(timer_obj) \
41 timer_obj = stop_timer(timer_obj)
43 typedef void (*ev_callback_t)(EV_P_ ev_timer *w, int revents);
45 /* We need this for libxkbfile */
46 static Display *display;
47 char color[7] = "ffffff";
48 int inactivity_timeout = 30;
49 uint32_t last_resolution[2];
51 static xcb_cursor_t cursor;
52 static pam_handle_t *pam_handle;
53 int input_position = 0;
54 /* Holds the password you enter (in UTF-8). */
55 static char password[512];
56 static bool beep = false;
57 bool debug_mode = false;
58 static bool dpms = false;
59 bool unlock_indicator = true;
60 static bool dont_fork = false;
61 struct ev_loop *main_loop;
62 static struct ev_timer *clear_pam_wrong_timeout;
63 static struct ev_timer *clear_indicator_timeout;
64 static struct ev_timer *dpms_timeout;
65 extern unlock_state_t unlock_state;
66 extern pam_state_t pam_state;
68 static struct xkb_state *xkb_state;
69 static struct xkb_context *xkb_context;
70 static struct xkb_keymap *xkb_keymap;
72 cairo_surface_t *img = NULL;
74 bool ignore_empty_password = false;
76 /* isutf, u8_dec © 2005 Jeff Bezanson, public domain */
77 #define isutf(c) (((c) & 0xC0) != 0x80)
80 * Decrements i to point to the previous unicode glyph
83 void u8_dec(char *s, int *i) {
84 (void)(isutf(s[--(*i)]) || isutf(s[--(*i)]) || isutf(s[--(*i)]) || --(*i));
87 static void turn_monitors_on(void) {
89 dpms_set_mode(conn, XCB_DPMS_DPMS_MODE_ON);
92 static void turn_monitors_off(void) {
94 dpms_set_mode(conn, XCB_DPMS_DPMS_MODE_OFF);
98 * Loads the XKB keymap from the X11 server and feeds it to xkbcommon.
99 * Necessary so that we can properly let xkbcommon track the keyboard state and
100 * translate keypresses to utf-8.
102 * Ideally, xkbcommon would ship something like this itself, but as of now
103 * (version 0.2.0), it doesn’t.
105 * TODO: Once xcb-xkb is enabled by default and released, we should port this
106 * code to xcb-xkb. See also https://github.com/xkbcommon/libxkbcommon/issues/1
109 static bool load_keymap(void) {
112 memset(&result, '\0', sizeof(result));
113 result.xkb = XkbGetKeyboard(display, XkbAllMapComponentsMask, XkbUseCoreKbd);
114 if (result.xkb == NULL) {
115 fprintf(stderr, "[i3lock] XKB: XkbGetKeyboard failed\n");
119 FILE *temp = tmpfile();
121 fprintf(stderr, "[i3lock] could not create tempfile\n");
125 bool ok = XkbWriteXKBKeymap(temp, &result, false, false, NULL, NULL);
127 fprintf(stderr, "[i3lock] XkbWriteXKBKeymap failed\n");
133 if (xkb_context == NULL) {
134 if ((xkb_context = xkb_context_new(0)) == NULL) {
135 fprintf(stderr, "[i3lock] could not create xkbcommon context\n");
140 if (xkb_keymap != NULL)
141 xkb_keymap_unref(xkb_keymap);
143 if ((xkb_keymap = xkb_keymap_new_from_file(xkb_context, temp, XKB_KEYMAP_FORMAT_TEXT_V1, 0)) == NULL) {
144 fprintf(stderr, "[i3lock] xkb_keymap_new_from_file failed\n");
148 struct xkb_state *new_state = xkb_state_new(xkb_keymap);
149 if (new_state == NULL) {
150 fprintf(stderr, "[i3lock] xkb_state_new failed\n");
154 /* Get the initial modifier state to be in sync with the X server.
155 * See https://github.com/xkbcommon/libxkbcommon/issues/1 for why we ignore
156 * the base and latched fields. */
157 XkbStateRec state_rec;
158 XkbGetState(display, XkbUseCoreKbd, &state_rec);
160 xkb_state_update_mask(new_state,
161 0, 0, state_rec.locked_mods,
162 0, 0, state_rec.locked_group);
164 if (xkb_state != NULL)
165 xkb_state_unref(xkb_state);
166 xkb_state = new_state;
170 XkbFreeKeyboard(result.xkb, XkbAllComponentsMask, true);
176 * Clears the memory which stored the password to be a bit safer against
180 static void clear_password_memory(void) {
181 /* A volatile pointer to the password buffer to prevent the compiler from
182 * optimizing this out. */
183 volatile char *vpassword = password;
184 for (int c = 0; c < sizeof(password); c++)
185 /* We store a non-random pattern which consists of the (irrelevant)
186 * index plus (!) the value of the beep variable. This prevents the
187 * compiler from optimizing the calls away, since the value of 'beep'
188 * is not known at compile-time. */
189 vpassword[c] = c + (int)beep;
192 ev_timer* start_timer(ev_timer *timer_obj, ev_tstamp timeout, ev_callback_t callback) {
194 ev_timer_stop(main_loop, timer_obj);
195 ev_timer_set(timer_obj, timeout, 0.);
196 ev_timer_start(main_loop, timer_obj);
198 /* When there is no memory, we just don’t have a timeout. We cannot
199 * exit() here, since that would effectively unlock the screen. */
200 timer_obj = calloc(sizeof(struct ev_timer), 1);
202 ev_timer_init(timer_obj, callback, timeout, 0.);
203 ev_timer_start(main_loop, timer_obj);
209 ev_timer* stop_timer(ev_timer *timer_obj) {
211 ev_timer_stop(main_loop, timer_obj);
218 * Resets pam_state to STATE_PAM_IDLE 2 seconds after an unsuccesful
219 * authentication event.
222 static void clear_pam_wrong(EV_P_ ev_timer *w, int revents) {
223 DEBUG("clearing pam wrong\n");
224 pam_state = STATE_PAM_IDLE;
225 unlock_state = STATE_STARTED;
228 /* Now free this timeout. */
229 ev_timer_stop(main_loop, clear_pam_wrong_timeout);
230 free(clear_pam_wrong_timeout);
231 clear_pam_wrong_timeout = NULL;
234 static void clear_indicator_cb(EV_P_ ev_timer *w, int revents) {
236 STOP_TIMER(clear_indicator_timeout);
239 static void clear_input(void) {
241 clear_password_memory();
242 password[input_position] = '\0';
244 /* Hide the unlock indicator after a bit if the password buffer is
246 START_TIMER(clear_indicator_timeout, 1.0, clear_indicator_cb);
247 unlock_state = STATE_BACKSPACE_ACTIVE;
249 unlock_state = STATE_KEY_PRESSED;
252 static void turn_off_monitors_cb(EV_P_ ev_timer *w, int revents) {
253 if (input_position == 0)
256 STOP_TIMER(dpms_timeout);
259 static void input_done(void) {
260 if (clear_pam_wrong_timeout) {
261 ev_timer_stop(main_loop, clear_pam_wrong_timeout);
262 free(clear_pam_wrong_timeout);
263 clear_pam_wrong_timeout = NULL;
266 pam_state = STATE_PAM_VERIFY;
269 if (pam_authenticate(pam_handle, 0) == PAM_SUCCESS) {
270 DEBUG("successfully authenticated\n");
271 clear_password_memory();
272 /* Turn the screen on, as it may have been turned off
273 * on release of the 'enter' key. */
279 fprintf(stderr, "Authentication failure\n");
281 pam_state = STATE_PAM_WRONG;
285 /* Clear this state after 2 seconds (unless the user enters another
286 * password during that time). */
287 ev_now_update(main_loop);
288 if ((clear_pam_wrong_timeout = calloc(sizeof(struct ev_timer), 1))) {
289 ev_timer_init(clear_pam_wrong_timeout, clear_pam_wrong, 2.0, 0.);
290 ev_timer_start(main_loop, clear_pam_wrong_timeout);
293 /* Cancel the clear_indicator_timeout, it would hide the unlock indicator
295 STOP_TIMER(clear_indicator_timeout);
297 /* beep on authentication failure, if enabled */
305 * Called when the user releases a key. We need to leave the Mode_switch
306 * state when the user releases the Mode_switch key.
309 static void handle_key_release(xcb_key_release_event_t *event) {
310 xkb_state_update_key(xkb_state, event->detail, XKB_KEY_UP);
313 static void redraw_timeout(EV_P_ ev_timer *w, int revents) {
316 ev_timer_stop(main_loop, w);
321 * Handle key presses. Fixes state, then looks up the key symbol for the
322 * given keycode, then looks up the key symbol (as UCS-2), converts it to
323 * UTF-8 and stores it in the password array.
326 static void handle_key_press(xcb_key_press_event_t *event) {
332 ksym = xkb_state_key_get_one_sym(xkb_state, event->detail);
333 ctrl = xkb_state_mod_name_is_active(xkb_state, "Control", XKB_STATE_MODS_DEPRESSED);
334 xkb_state_update_key(xkb_state, event->detail, XKB_KEY_DOWN);
336 /* The buffer will be null-terminated, so n >= 2 for 1 actual character. */
337 memset(buffer, '\0', sizeof(buffer));
338 n = xkb_keysym_to_utf8(ksym, buffer, sizeof(buffer));
342 case XKB_KEY_KP_Enter:
343 case XKB_KEY_XF86ScreenSaver:
344 if (ignore_empty_password && input_position == 0) {
348 password[input_position] = '\0';
349 unlock_state = STATE_KEY_PRESSED;
356 DEBUG("C-u pressed\n");
366 case XKB_KEY_BackSpace:
367 if (input_position == 0)
370 /* decrement input_position to point to the previous glyph */
371 u8_dec(password, &input_position);
372 password[input_position] = '\0';
374 /* Hide the unlock indicator after a bit if the password buffer is
376 START_TIMER(clear_indicator_timeout, 1.0, clear_indicator_cb);
377 unlock_state = STATE_BACKSPACE_ACTIVE;
379 unlock_state = STATE_KEY_PRESSED;
383 if ((input_position + 8) >= sizeof(password))
387 /* FIXME: handle all of these? */
388 printf("is_keypad_key = %d\n", xcb_is_keypad_key(sym));
389 printf("is_private_keypad_key = %d\n", xcb_is_private_keypad_key(sym));
390 printf("xcb_is_cursor_key = %d\n", xcb_is_cursor_key(sym));
391 printf("xcb_is_pf_key = %d\n", xcb_is_pf_key(sym));
392 printf("xcb_is_function_key = %d\n", xcb_is_function_key(sym));
393 printf("xcb_is_misc_function_key = %d\n", xcb_is_misc_function_key(sym));
394 printf("xcb_is_modifier_key = %d\n", xcb_is_modifier_key(sym));
400 /* store it in the password array as UTF-8 */
401 memcpy(password+input_position, buffer, n-1);
402 input_position += n-1;
403 DEBUG("current password = %.*s\n", input_position, password);
405 unlock_state = STATE_KEY_ACTIVE;
407 unlock_state = STATE_KEY_PRESSED;
409 struct ev_timer *timeout = calloc(sizeof(struct ev_timer), 1);
411 ev_timer_init(timeout, redraw_timeout, 0.25, 0.);
412 ev_timer_start(main_loop, timeout);
415 STOP_TIMER(clear_indicator_timeout);
419 * A visibility notify event will be received when the visibility (= can the
420 * user view the complete window) changes, so for example when a popup overlays
421 * some area of the i3lock window.
423 * In this case, we raise our window on top so that the popup (or whatever is
424 * hiding us) gets hidden.
427 static void handle_visibility_notify(xcb_connection_t *conn,
428 xcb_visibility_notify_event_t *event) {
429 if (event->state != XCB_VISIBILITY_UNOBSCURED) {
430 uint32_t values[] = { XCB_STACK_MODE_ABOVE };
431 xcb_configure_window(conn, event->window, XCB_CONFIG_WINDOW_STACK_MODE, values);
437 * Called when the keyboard mapping changes. We update our symbols.
440 static void handle_mapping_notify(xcb_mapping_notify_event_t *event) {
441 /* We ignore errors — if the new keymap cannot be loaded it’s better if the
442 * screen stays locked and the user intervenes by using killall i3lock. */
447 * Called when the properties on the root window change, e.g. when the screen
448 * resolution changes. If so we update the window to cover the whole screen
449 * and also redraw the image, if any.
452 void handle_screen_resize(void) {
453 xcb_get_geometry_cookie_t geomc;
454 xcb_get_geometry_reply_t *geom;
455 geomc = xcb_get_geometry(conn, screen->root);
456 if ((geom = xcb_get_geometry_reply(conn, geomc, 0)) == NULL)
459 if (last_resolution[0] == geom->width &&
460 last_resolution[1] == geom->height) {
465 last_resolution[0] = geom->width;
466 last_resolution[1] = geom->height;
472 uint32_t mask = XCB_CONFIG_WINDOW_WIDTH | XCB_CONFIG_WINDOW_HEIGHT;
473 xcb_configure_window(conn, win, mask, last_resolution);
476 xinerama_query_screens();
481 * Callback function for PAM. We only react on password request callbacks.
484 static int conv_callback(int num_msg, const struct pam_message **msg,
485 struct pam_response **resp, void *appdata_ptr)
490 /* PAM expects an array of responses, one for each message */
491 if ((*resp = calloc(num_msg, sizeof(struct pam_response))) == NULL) {
496 for (int c = 0; c < num_msg; c++) {
497 if (msg[c]->msg_style != PAM_PROMPT_ECHO_OFF &&
498 msg[c]->msg_style != PAM_PROMPT_ECHO_ON)
501 /* return code is currently not used but should be set to zero */
502 resp[c]->resp_retcode = 0;
503 if ((resp[c]->resp = strdup(password)) == NULL) {
513 * This callback is only a dummy, see xcb_prepare_cb and xcb_check_cb.
514 * See also man libev(3): "ev_prepare" and "ev_check" - customise your event loop
517 static void xcb_got_event(EV_P_ struct ev_io *w, int revents) {
518 /* empty, because xcb_prepare_cb and xcb_check_cb are used */
522 * Flush before blocking (and waiting for new events)
525 static void xcb_prepare_cb(EV_P_ ev_prepare *w, int revents) {
530 * Instead of polling the X connection socket we leave this to
531 * xcb_poll_for_event() which knows better than we can ever know.
534 static void xcb_check_cb(EV_P_ ev_check *w, int revents) {
535 xcb_generic_event_t *event;
537 while ((event = xcb_poll_for_event(conn)) != NULL) {
538 if (event->response_type == 0) {
539 xcb_generic_error_t *error = (xcb_generic_error_t*)event;
541 fprintf(stderr, "X11 Error received! sequence 0x%x, error_code = %d\n",
542 error->sequence, error->error_code);
547 /* Strip off the highest bit (set if the event is generated) */
548 int type = (event->response_type & 0x7F);
551 handle_key_press((xcb_key_press_event_t*)event);
554 case XCB_KEY_RELEASE:
555 handle_key_release((xcb_key_release_event_t*)event);
557 /* If this was the backspace or escape key we are back at an
558 * empty input, so turn off the screen if DPMS is enabled, but
559 * only do that after some timeout: maybe user mistyped and
560 * will type again right away */
561 START_TIMER(dpms_timeout, TSTAMP_N_SECS(inactivity_timeout),
562 turn_off_monitors_cb);
565 case XCB_VISIBILITY_NOTIFY:
566 handle_visibility_notify(conn, (xcb_visibility_notify_event_t*)event);
571 /* After the first MapNotify, we never fork again. We don’t
572 * expect to get another MapNotify, but better be sure… */
575 /* In the parent process, we exit */
579 ev_loop_fork(EV_DEFAULT);
583 case XCB_MAPPING_NOTIFY:
584 handle_mapping_notify((xcb_mapping_notify_event_t*)event);
587 case XCB_CONFIGURE_NOTIFY:
588 handle_screen_resize();
597 * This function is called from a fork()ed child and will raise the i3lock
598 * window when the window is obscured, even when the main i3lock process is
599 * blocked due to PAM.
602 static void raise_loop(xcb_window_t window) {
603 xcb_connection_t *conn;
604 xcb_generic_event_t *event;
607 if ((conn = xcb_connect(NULL, &screens)) == NULL ||
608 xcb_connection_has_error(conn))
609 errx(EXIT_FAILURE, "Cannot open display\n");
611 /* We need to know about the window being obscured or getting destroyed. */
612 xcb_change_window_attributes(conn, window, XCB_CW_EVENT_MASK,
614 XCB_EVENT_MASK_VISIBILITY_CHANGE |
615 XCB_EVENT_MASK_STRUCTURE_NOTIFY
619 DEBUG("Watching window 0x%08x\n", window);
620 while ((event = xcb_wait_for_event(conn)) != NULL) {
621 if (event->response_type == 0) {
622 xcb_generic_error_t *error = (xcb_generic_error_t*)event;
623 DEBUG("X11 Error received! sequence 0x%x, error_code = %d\n",
624 error->sequence, error->error_code);
628 /* Strip off the highest bit (set if the event is generated) */
629 int type = (event->response_type & 0x7F);
630 DEBUG("Read event of type %d\n", type);
632 case XCB_VISIBILITY_NOTIFY:
633 handle_visibility_notify(conn, (xcb_visibility_notify_event_t*)event);
635 case XCB_UNMAP_NOTIFY:
636 DEBUG("UnmapNotify for 0x%08x\n", (((xcb_unmap_notify_event_t*)event)->window));
637 if (((xcb_unmap_notify_event_t*)event)->window == window)
640 case XCB_DESTROY_NOTIFY:
641 DEBUG("DestroyNotify for 0x%08x\n", (((xcb_destroy_notify_event_t*)event)->window));
642 if (((xcb_destroy_notify_event_t*)event)->window == window)
646 DEBUG("Unhandled event type %d\n", type);
653 int main(int argc, char *argv[]) {
655 char *image_path = NULL;
657 struct pam_conv conv = {conv_callback, NULL};
658 int curs_choice = CURS_NONE;
661 struct option longopts[] = {
662 {"version", no_argument, NULL, 'v'},
663 {"nofork", no_argument, NULL, 'n'},
664 {"beep", no_argument, NULL, 'b'},
665 {"dpms", no_argument, NULL, 'd'},
666 {"color", required_argument, NULL, 'c'},
667 {"pointer", required_argument, NULL , 'p'},
668 {"debug", no_argument, NULL, 0},
669 {"help", no_argument, NULL, 'h'},
670 {"no-unlock-indicator", no_argument, NULL, 'u'},
671 {"image", required_argument, NULL, 'i'},
672 {"tiling", no_argument, NULL, 't'},
673 {"ignore-empty-password", no_argument, NULL, 'e'},
674 {"inactivity-timeout", required_argument, NULL, 'I'},
675 {NULL, no_argument, NULL, 0}
678 if ((username = getenv("USER")) == NULL)
679 errx(EXIT_FAILURE, "USER environment variable not set, please set it.\n");
681 char *optstring = "hvnbdc:p:ui:teI:";
682 while ((o = getopt_long(argc, argv, optstring, longopts, &optind)) != -1) {
685 errx(EXIT_SUCCESS, "version " VERSION " © 2010-2012 Michael Stapelberg");
697 if (sscanf(optarg, "%d", &time) != 1 || time < 0)
698 errx(EXIT_FAILURE, "invalid timeout, it must be a positive integer\n");
699 inactivity_timeout = time;
705 /* Skip # if present */
709 if (strlen(arg) != 6 || sscanf(arg, "%06[0-9a-fA-F]", color) != 1)
710 errx(EXIT_FAILURE, "color is invalid, it must be given in 3-byte hexadecimal format: rrggbb\n");
715 unlock_indicator = false;
718 image_path = strdup(optarg);
724 if (!strcmp(optarg, "win")) {
725 curs_choice = CURS_WIN;
726 } else if (!strcmp(optarg, "default")) {
727 curs_choice = CURS_DEFAULT;
729 errx(EXIT_FAILURE, "i3lock: Invalid pointer type given. Expected one of \"win\" or \"default\".\n");
733 ignore_empty_password = true;
736 if (strcmp(longopts[optind].name, "debug") == 0)
740 errx(EXIT_FAILURE, "Syntax: i3lock [-v] [-n] [-b] [-d] [-c color] [-u] [-p win|default]"
741 " [-i image.png] [-t] [-e] [-I]"
746 /* We need (relatively) random numbers for highlighting a random part of
747 * the unlock indicator upon keypresses. */
751 ret = pam_start("i3lock", username, &conv, &pam_handle);
752 if (ret != PAM_SUCCESS)
753 errx(EXIT_FAILURE, "PAM: %s", pam_strerror(pam_handle, ret));
755 /* Using mlock() as non-super-user seems only possible in Linux. Users of other
756 * operating systems should use encrypted swap/no swap (or remove the ifdef and
757 * run i3lock as super-user). */
758 #if defined(__linux__)
759 /* Lock the area where we store the password in memory, we don’t want it to
760 * be swapped to disk. Since Linux 2.6.9, this does not require any
761 * privileges, just enough bytes in the RLIMIT_MEMLOCK limit. */
762 if (mlock(password, sizeof(password)) != 0)
763 err(EXIT_FAILURE, "Could not lock page in memory, check RLIMIT_MEMLOCK");
766 /* Initialize connection to X11 */
767 if ((display = XOpenDisplay(NULL)) == NULL)
768 errx(EXIT_FAILURE, "Could not connect to X11, maybe you need to set DISPLAY?");
769 XSetEventQueueOwner(display, XCBOwnsEventQueue);
770 conn = XGetXCBConnection(display);
772 /* Double checking that connection is good and operatable with xcb */
773 if (xcb_connection_has_error(conn))
774 errx(EXIT_FAILURE, "Could not connect to X11, maybe you need to set DISPLAY?");
776 /* When we cannot initially load the keymap, we better exit */
778 errx(EXIT_FAILURE, "Could not load keymap");
781 xinerama_query_screens();
783 /* if DPMS is enabled, check if the X server really supports it */
785 xcb_dpms_capable_cookie_t dpmsc = xcb_dpms_capable(conn);
786 xcb_dpms_capable_reply_t *dpmsr;
787 if ((dpmsr = xcb_dpms_capable_reply(conn, dpmsc, NULL))) {
788 if (!dpmsr->capable) {
790 fprintf(stderr, "Disabling DPMS, X server not DPMS capable\n");
797 screen = xcb_setup_roots_iterator(xcb_get_setup(conn)).data;
799 last_resolution[0] = screen->width_in_pixels;
800 last_resolution[1] = screen->height_in_pixels;
802 xcb_change_window_attributes(conn, screen->root, XCB_CW_EVENT_MASK,
803 (uint32_t[]){ XCB_EVENT_MASK_STRUCTURE_NOTIFY });
806 /* Create a pixmap to render on, fill it with the background color */
807 img = cairo_image_surface_create_from_png(image_path);
808 /* In case loading failed, we just pretend no -i was specified. */
809 if (cairo_surface_status(img) != CAIRO_STATUS_SUCCESS) {
810 fprintf(stderr, "Could not load image \"%s\": %s\n",
811 image_path, cairo_status_to_string(cairo_surface_status(img)));
816 /* Pixmap on which the image is rendered to (if any) */
817 xcb_pixmap_t bg_pixmap = draw_image(last_resolution);
819 /* open the fullscreen window, already with the correct pixmap in place */
820 win = open_fullscreen_window(conn, screen, color, bg_pixmap);
821 xcb_free_pixmap(conn, bg_pixmap);
824 /* The pid == -1 case is intentionally ignored here:
825 * While the child process is useful for preventing other windows from
826 * popping up while i3lock blocks, it is not critical. */
829 close(xcb_get_file_descriptor(conn));
834 cursor = create_cursor(conn, screen, win, curs_choice);
836 grab_pointer_and_keyboard(conn, screen, cursor);
837 /* Load the keymap again to sync the current modifier state. Since we first
838 * loaded the keymap, there might have been changes, but starting from now,
839 * we should get all key presses/releases due to having grabbed the
845 /* Initialize the libev event loop. */
846 main_loop = EV_DEFAULT;
847 if (main_loop == NULL)
848 errx(EXIT_FAILURE, "Could not initialize libev. Bad LIBEV_FLAGS?\n");
850 struct ev_io *xcb_watcher = calloc(sizeof(struct ev_io), 1);
851 struct ev_check *xcb_check = calloc(sizeof(struct ev_check), 1);
852 struct ev_prepare *xcb_prepare = calloc(sizeof(struct ev_prepare), 1);
854 ev_io_init(xcb_watcher, xcb_got_event, xcb_get_file_descriptor(conn), EV_READ);
855 ev_io_start(main_loop, xcb_watcher);
857 ev_check_init(xcb_check, xcb_check_cb);
858 ev_check_start(main_loop, xcb_check);
860 ev_prepare_init(xcb_prepare, xcb_prepare_cb);
861 ev_prepare_start(main_loop, xcb_prepare);
863 /* Invoke the event callback once to catch all the events which were
864 * received up until now. ev will only pick up new events (when the X11
865 * file descriptor becomes readable). */
866 ev_invoke(main_loop, xcb_check, 0);
867 ev_loop(main_loop, 0);