2 #define I3__FILE__ "main.c"
4 * vim:ts=4:sw=4:expandtab
6 * i3 - an improved dynamic tiling window manager
7 * © 2009-2012 Michael Stapelberg and contributors (see also: LICENSE)
9 * main.c: Initialization, main loop
14 #include <sys/types.h>
15 #include <sys/socket.h>
18 #include <sys/resource.h>
23 #include "sd-daemon.h"
25 /* The original value of RLIMIT_CORE when i3 was started. We need to restore
26 * this before starting any other process, since we set RLIMIT_CORE to
27 * RLIM_INFINITY for i3 debugging versions. */
28 struct rlimit original_rlimit_core;
30 /** The number of file descriptors passed via socket activation. */
33 static int xkb_event_base;
35 int xkb_current_group;
41 xcb_connection_t *conn;
42 /* The screen (0 when you are using DISPLAY=:0) of the connection 'conn' */
45 /* Display handle for libstartup-notification */
48 /* The last timestamp we got from X11 (timestamps are included in some events
49 * and are used for some things, like determining a unique ID in startup
51 xcb_timestamp_t last_timestamp = XCB_CURRENT_TIME;
53 xcb_screen_t *root_screen;
56 /* Color depth, visual id and colormap to use when creating windows and
57 * pixmaps. Will use 32 bit depth and an appropriate visual, if available,
58 * otherwise the root window’s default (usually 24 bit TrueColor). */
60 xcb_visualid_t visual_id;
61 xcb_colormap_t colormap;
63 struct ev_loop *main_loop;
65 xcb_key_symbols_t *keysyms;
67 /* Those are our connections to X11 for use with libXcursor and XKB */
68 Display *xlibdpy, *xkbdpy;
70 /* The list of key bindings */
71 struct bindings_head *bindings;
73 /* The list of exec-lines */
74 struct autostarts_head autostarts = TAILQ_HEAD_INITIALIZER(autostarts);
76 /* The list of exec_always lines */
77 struct autostarts_always_head autostarts_always = TAILQ_HEAD_INITIALIZER(autostarts_always);
79 /* The list of assignments */
80 struct assignments_head assignments = TAILQ_HEAD_INITIALIZER(assignments);
82 /* The list of workspace assignments (which workspace should end up on which
84 struct ws_assignments_head ws_assignments = TAILQ_HEAD_INITIALIZER(ws_assignments);
86 /* We hope that those are supported and set them to true */
87 bool xcursor_supported = true;
88 bool xkb_supported = true;
90 /* This will be set to true when -C is used so that functions can behave
91 * slightly differently. We don’t want i3-nagbar to be started when validating
92 * the config, for example. */
93 bool only_check_config = false;
96 * This callback is only a dummy, see xcb_prepare_cb and xcb_check_cb.
97 * See also man libev(3): "ev_prepare" and "ev_check" - customise your event loop
100 static void xcb_got_event(EV_P_ struct ev_io *w, int revents) {
101 /* empty, because xcb_prepare_cb and xcb_check_cb are used */
105 * Flush before blocking (and waiting for new events)
108 static void xcb_prepare_cb(EV_P_ ev_prepare *w, int revents) {
113 * Instead of polling the X connection socket we leave this to
114 * xcb_poll_for_event() which knows better than we can ever know.
117 static void xcb_check_cb(EV_P_ ev_check *w, int revents) {
118 xcb_generic_event_t *event;
120 while ((event = xcb_poll_for_event(conn)) != NULL) {
121 if (event->response_type == 0) {
122 if (event_is_ignored(event->sequence, 0))
123 DLOG("Expected X11 Error received for sequence %x\n", event->sequence);
125 xcb_generic_error_t *error = (xcb_generic_error_t*)event;
126 DLOG("X11 Error received (probably harmless)! sequence 0x%x, error_code = %d\n",
127 error->sequence, error->error_code);
133 /* Strip off the highest bit (set if the event is generated) */
134 int type = (event->response_type & 0x7F);
136 handle_event(type, event);
144 * When using xmodmap to change the keyboard mapping, this event
145 * is only sent via XKB. Therefore, we need this special handler.
148 static void xkb_got_event(EV_P_ struct ev_io *w, int revents) {
149 DLOG("Handling XKB event\n");
152 /* When using xmodmap, every change (!) gets an own event.
153 * Therefore, we just read all events and only handle the
154 * mapping_notify once. */
155 bool mapping_changed = false;
156 while (XPending(xkbdpy)) {
157 XNextEvent(xkbdpy, (XEvent*)&ev);
158 /* While we should never receive a non-XKB event,
159 * better do sanity checking */
160 if (ev.type != xkb_event_base)
163 if (ev.any.xkb_type == XkbMapNotify) {
164 mapping_changed = true;
168 if (ev.any.xkb_type != XkbStateNotify) {
169 ELOG("Unknown XKB event received (type %d)\n", ev.any.xkb_type);
173 /* See The XKB Extension: Library Specification, section 14.1 */
174 /* We check if the current group (each group contains
175 * two levels) has been changed. Mode_switch activates
176 * group XkbGroup2Index */
177 if (xkb_current_group == ev.state.group)
180 xkb_current_group = ev.state.group;
182 if (ev.state.group == XkbGroup2Index) {
183 DLOG("Mode_switch enabled\n");
184 grab_all_keys(conn, true);
187 if (ev.state.group == XkbGroup1Index) {
188 DLOG("Mode_switch disabled\n");
189 ungrab_all_keys(conn);
190 grab_all_keys(conn, false);
194 if (!mapping_changed)
197 DLOG("Keyboard mapping changed, updating keybindings\n");
198 xcb_key_symbols_free(keysyms);
199 keysyms = xcb_key_symbols_alloc(conn);
201 xcb_numlock_mask = aio_get_mod_mask_for(XCB_NUM_LOCK, keysyms);
203 ungrab_all_keys(conn);
204 DLOG("Re-grabbing...\n");
206 grab_all_keys(conn, (xkb_current_group == XkbGroup2Index));
211 * Exit handler which destroys the main_loop. Will trigger cleanup handlers.
214 static void i3_exit(void) {
215 /* We need ev >= 4 for the following code. Since it is not *that* important (it
216 * only makes sure that there are no i3-nagbar instances left behind) we still
217 * support old systems with libev 3. */
218 #if EV_VERSION_MAJOR >= 4
219 ev_loop_destroy(main_loop);
222 if (*shmlogname != '\0') {
223 fprintf(stderr, "Closing SHM log \"%s\"\n", shmlogname);
225 shm_unlink(shmlogname);
230 * (One-shot) Handler for all signals with default action "Term", see signal(7)
232 * Unlinks the SHM log and re-raises the signal.
235 static void handle_signal(int sig, siginfo_t *info, void *data) {
236 fprintf(stderr, "Received signal %d, terminating\n", sig);
237 if (*shmlogname != '\0') {
238 fprintf(stderr, "Closing SHM log \"%s\"\n", shmlogname);
239 shm_unlink(shmlogname);
245 int main(int argc, char *argv[]) {
246 /* Keep a symbol pointing to the I3_VERSION string constant so that we have
247 * it in gdb backtraces. */
248 const char *i3_version __attribute__ ((unused)) = I3_VERSION;
249 char *override_configpath = NULL;
250 bool autostart = true;
251 char *layout_path = NULL;
252 bool delete_layout_path = false;
253 bool force_xinerama = false;
254 char *fake_outputs = NULL;
255 bool disable_signalhandler = false;
256 static struct option long_options[] = {
257 {"no-autostart", no_argument, 0, 'a'},
258 {"config", required_argument, 0, 'c'},
259 {"version", no_argument, 0, 'v'},
260 {"moreversion", no_argument, 0, 'm'},
261 {"more-version", no_argument, 0, 'm'},
262 {"more_version", no_argument, 0, 'm'},
263 {"help", no_argument, 0, 'h'},
264 {"layout", required_argument, 0, 'L'},
265 {"restart", required_argument, 0, 0},
266 {"force-xinerama", no_argument, 0, 0},
267 {"force_xinerama", no_argument, 0, 0},
268 {"disable-signalhandler", no_argument, 0, 0},
269 {"shmlog-size", required_argument, 0, 0},
270 {"shmlog_size", required_argument, 0, 0},
271 {"get-socketpath", no_argument, 0, 0},
272 {"get_socketpath", no_argument, 0, 0},
273 {"fake_outputs", required_argument, 0, 0},
274 {"fake-outputs", required_argument, 0, 0},
277 int option_index = 0, opt;
279 setlocale(LC_ALL, "");
281 /* Get the RLIMIT_CORE limit at startup time to restore this before
282 * starting processes. */
283 getrlimit(RLIMIT_CORE, &original_rlimit_core);
285 /* Disable output buffering to make redirects in .xsession actually useful for debugging */
286 if (!isatty(fileno(stdout)))
287 setbuf(stdout, NULL);
291 /* Init logging *before* initializing debug_build to guarantee early
295 /* On non-release builds, disable SHM logging by default. */
296 shmlog_size = (is_debug_build() ? 25 * 1024 * 1024 : 0);
300 while ((opt = getopt_long(argc, argv, "c:CvmaL:hld:V", long_options, &option_index)) != -1) {
303 LOG("Autostart disabled using -a\n");
308 layout_path = sstrdup(optarg);
309 delete_layout_path = false;
312 FREE(override_configpath);
313 override_configpath = sstrdup(optarg);
316 LOG("Checking configuration file only (-C)\n");
317 only_check_config = true;
320 printf("i3 version " I3_VERSION " © 2009-2012 Michael Stapelberg and contributors\n");
324 printf("Binary i3 version: " I3_VERSION " © 2009-2012 Michael Stapelberg and contributors\n");
325 display_running_version();
332 LOG("Enabling debug logging\n");
333 set_debug_logging(true);
336 /* DEPRECATED, ignored for the next 3 versions (3.e, 3.f, 3.g) */
339 if (strcmp(long_options[option_index].name, "force-xinerama") == 0 ||
340 strcmp(long_options[option_index].name, "force_xinerama") == 0) {
341 force_xinerama = true;
342 ELOG("Using Xinerama instead of RandR. This option should be "
343 "avoided at all cost because it does not refresh the list "
344 "of screens, so you cannot configure displays at runtime. "
345 "Please check if your driver really does not support RandR "
346 "and disable this option as soon as you can.\n");
348 } else if (strcmp(long_options[option_index].name, "disable-signalhandler") == 0) {
349 disable_signalhandler = true;
351 } else if (strcmp(long_options[option_index].name, "get-socketpath") == 0 ||
352 strcmp(long_options[option_index].name, "get_socketpath") == 0) {
353 char *socket_path = root_atom_contents("I3_SOCKET_PATH");
355 printf("%s\n", socket_path);
360 } else if (strcmp(long_options[option_index].name, "shmlog-size") == 0 ||
361 strcmp(long_options[option_index].name, "shmlog_size") == 0) {
362 shmlog_size = atoi(optarg);
363 /* Re-initialize logging immediately to get as many
364 * logmessages as possible into the SHM log. */
366 LOG("Limiting SHM log size to %d bytes\n", shmlog_size);
368 } else if (strcmp(long_options[option_index].name, "restart") == 0) {
370 layout_path = sstrdup(optarg);
371 delete_layout_path = true;
373 } else if (strcmp(long_options[option_index].name, "fake-outputs") == 0 ||
374 strcmp(long_options[option_index].name, "fake_outputs") == 0) {
375 LOG("Initializing fake outputs: %s\n", optarg);
376 fake_outputs = sstrdup(optarg);
381 fprintf(stderr, "Usage: %s [-c configfile] [-d all] [-a] [-v] [-V] [-C]\n", argv[0]);
382 fprintf(stderr, "\n");
383 fprintf(stderr, "\t-a disable autostart ('exec' lines in config)\n");
384 fprintf(stderr, "\t-c <file> use the provided configfile instead\n");
385 fprintf(stderr, "\t-C validate configuration file and exit\n");
386 fprintf(stderr, "\t-d all enable debug output\n");
387 fprintf(stderr, "\t-L <file> path to the serialized layout during restarts\n");
388 fprintf(stderr, "\t-v display version and exit\n");
389 fprintf(stderr, "\t-V enable verbose mode\n");
390 fprintf(stderr, "\n");
391 fprintf(stderr, "\t--force-xinerama\n"
392 "\tUse Xinerama instead of RandR.\n"
393 "\tThis option should only be used if you are stuck with the\n"
394 "\told nVidia closed source driver (older than 302.17), which does\n"
395 "\tnot support RandR.\n");
396 fprintf(stderr, "\n");
397 fprintf(stderr, "\t--get-socketpath\n"
398 "\tRetrieve the i3 IPC socket path from X11, print it, then exit.\n");
399 fprintf(stderr, "\n");
400 fprintf(stderr, "\t--shmlog-size <limit>\n"
401 "\tLimits the size of the i3 SHM log to <limit> bytes. Setting this\n"
402 "\tto 0 disables SHM logging entirely.\n"
403 "\tThe default is %d bytes.\n", shmlog_size);
404 fprintf(stderr, "\n");
405 fprintf(stderr, "If you pass plain text arguments, i3 will interpret them as a command\n"
406 "to send to a currently running i3 (like i3-msg). This allows you to\n"
407 "use nice and logical commands, such as:\n"
410 "\ti3 floating toggle\n"
417 /* If the user passes more arguments, we act like i3-msg would: Just send
418 * the arguments as an IPC message to i3. This allows for nice semantic
419 * commands such as 'i3 border none'. */
420 if (!only_check_config && optind < argc) {
421 /* We enable verbose mode so that the user knows what’s going on.
422 * This should make it easier to find mistakes when the user passes
423 * arguments by mistake. */
426 LOG("Additional arguments passed. Sending them as a command to i3.\n");
427 char *payload = NULL;
428 while (optind < argc) {
430 payload = sstrdup(argv[optind]);
433 sasprintf(&both, "%s %s", payload, argv[optind]);
439 DLOG("Command is: %s (%zd bytes)\n", payload, strlen(payload));
440 char *socket_path = root_atom_contents("I3_SOCKET_PATH");
442 ELOG("Could not get i3 IPC socket path\n");
446 int sockfd = socket(AF_LOCAL, SOCK_STREAM, 0);
448 err(EXIT_FAILURE, "Could not create socket");
450 struct sockaddr_un addr;
451 memset(&addr, 0, sizeof(struct sockaddr_un));
452 addr.sun_family = AF_LOCAL;
453 strncpy(addr.sun_path, socket_path, sizeof(addr.sun_path) - 1);
454 if (connect(sockfd, (const struct sockaddr*)&addr, sizeof(struct sockaddr_un)) < 0)
455 err(EXIT_FAILURE, "Could not connect to i3");
457 if (ipc_send_message(sockfd, strlen(payload), I3_IPC_MESSAGE_TYPE_COMMAND,
458 (uint8_t*)payload) == -1)
459 err(EXIT_FAILURE, "IPC: write()");
461 uint32_t reply_length;
464 if ((ret = ipc_recv_message(sockfd, I3_IPC_MESSAGE_TYPE_COMMAND,
465 &reply_length, &reply)) != 0) {
467 err(EXIT_FAILURE, "IPC: read()");
470 printf("%.*s\n", reply_length, reply);
474 /* Enable logging to handle the case when the user did not specify --shmlog-size */
477 /* Try to enable core dumps by default when running a debug build */
478 if (is_debug_build()) {
479 struct rlimit limit = { RLIM_INFINITY, RLIM_INFINITY };
480 setrlimit(RLIMIT_CORE, &limit);
482 /* The following code is helpful, but not required. We thus don’t pay
483 * much attention to error handling, non-linux or other edge cases. */
485 LOG("CORE DUMPS: You are running a development version of i3, so coredumps were automatically enabled (ulimit -c unlimited).\n");
486 if (getcwd(cwd, sizeof(cwd)) != NULL)
487 LOG("CORE DUMPS: Your current working directory is \"%s\".\n", cwd);
489 if ((patternfd = open("/proc/sys/kernel/core_pattern", O_RDONLY)) >= 0) {
490 memset(cwd, '\0', sizeof(cwd));
491 if (read(patternfd, cwd, sizeof(cwd)) > 0)
492 /* a trailing newline is included in cwd */
493 LOG("CORE DUMPS: Your core_pattern is: %s", cwd);
498 LOG("i3 " I3_VERSION " starting\n");
500 conn = xcb_connect(NULL, &conn_screen);
501 if (xcb_connection_has_error(conn))
502 errx(EXIT_FAILURE, "Cannot open display\n");
504 sndisplay = sn_xcb_display_new(conn, NULL, NULL);
506 /* Initialize the libev event loop. This needs to be done before loading
507 * the config file because the parser will install an ev_child watcher
508 * for the nagbar when config errors are found. */
509 main_loop = EV_DEFAULT;
510 if (main_loop == NULL)
511 die("Could not initialize libev. Bad LIBEV_FLAGS?\n");
513 root_screen = xcb_aux_get_screen(conn, conn_screen);
514 root = root_screen->root;
516 /* By default, we use the same depth and visual as the root window, which
517 * usually is TrueColor (24 bit depth) and the corresponding visual.
518 * However, we also check if a 32 bit depth and visual are available (for
519 * transparency) and use it if so. */
520 root_depth = root_screen->root_depth;
521 visual_id = root_screen->root_visual;
522 colormap = root_screen->default_colormap;
524 DLOG("root_depth = %d, visual_id = 0x%08x.\n", root_depth, visual_id);
526 xcb_get_geometry_cookie_t gcookie = xcb_get_geometry(conn, root);
527 xcb_query_pointer_cookie_t pointercookie = xcb_query_pointer(conn, root);
529 load_configuration(conn, override_configpath, false);
530 if (only_check_config) {
531 LOG("Done checking configuration file. Exiting.\n");
535 if (config.ipc_socket_path == NULL) {
536 /* Fall back to a file name in /tmp/ based on the PID */
537 if ((config.ipc_socket_path = getenv("I3SOCK")) == NULL)
538 config.ipc_socket_path = get_process_filename("ipc-socket");
540 config.ipc_socket_path = sstrdup(config.ipc_socket_path);
543 uint32_t mask = XCB_CW_EVENT_MASK;
544 uint32_t values[] = { XCB_EVENT_MASK_SUBSTRUCTURE_REDIRECT |
545 XCB_EVENT_MASK_STRUCTURE_NOTIFY | /* when the user adds a screen (e.g. video
546 projector), the root window gets a
548 XCB_EVENT_MASK_POINTER_MOTION |
549 XCB_EVENT_MASK_PROPERTY_CHANGE |
550 XCB_EVENT_MASK_ENTER_WINDOW };
551 xcb_void_cookie_t cookie;
552 cookie = xcb_change_window_attributes_checked(conn, root, mask, values);
553 check_error(conn, cookie, "Another window manager seems to be running");
555 xcb_get_geometry_reply_t *greply = xcb_get_geometry_reply(conn, gcookie, NULL);
556 if (greply == NULL) {
557 ELOG("Could not get geometry of the root window, exiting\n");
560 DLOG("root geometry reply: (%d, %d) %d x %d\n", greply->x, greply->y, greply->width, greply->height);
562 /* Place requests for the atoms we need as soon as possible */
563 #define xmacro(atom) \
564 xcb_intern_atom_cookie_t atom ## _cookie = xcb_intern_atom(conn, 0, strlen(#atom), #atom);
565 #include "atoms.xmacro"
568 /* Initialize the Xlib connection */
569 xlibdpy = xkbdpy = XOpenDisplay(NULL);
571 /* Try to load the X cursors and initialize the XKB extension */
572 if (xlibdpy == NULL) {
573 ELOG("ERROR: XOpenDisplay() failed, disabling libXcursor/XKB support\n");
574 xcursor_supported = false;
575 xkb_supported = false;
576 } else if (fcntl(ConnectionNumber(xlibdpy), F_SETFD, FD_CLOEXEC) == -1) {
577 ELOG("Could not set FD_CLOEXEC on xkbdpy\n");
580 xcursor_load_cursors();
584 /* Set a cursor for the root window (otherwise the root window will show no
585 cursor until the first client is launched). */
586 if (xcursor_supported)
587 xcursor_set_root_cursor(XCURSOR_CURSOR_POINTER);
588 else xcb_set_root_cursor(XCURSOR_CURSOR_POINTER);
592 major = XkbMajorVersion,
593 minor = XkbMinorVersion;
595 if (fcntl(ConnectionNumber(xkbdpy), F_SETFD, FD_CLOEXEC) == -1) {
596 fprintf(stderr, "Could not set FD_CLOEXEC on xkbdpy\n");
601 if (!XkbQueryExtension(xkbdpy,&i1,&xkb_event_base,&errBase,&major,&minor)) {
602 fprintf(stderr, "XKB not supported by X-server\n");
605 /* end of ugliness */
607 if (!XkbSelectEvents(xkbdpy, XkbUseCoreKbd,
608 XkbMapNotifyMask | XkbStateNotifyMask,
609 XkbMapNotifyMask | XkbStateNotifyMask)) {
610 fprintf(stderr, "Could not set XKB event mask\n");
615 /* Setup NetWM atoms */
616 #define xmacro(name) \
618 xcb_intern_atom_reply_t *reply = xcb_intern_atom_reply(conn, name ## _cookie, NULL); \
620 ELOG("Could not get atom " #name "\n"); \
623 A_ ## name = reply->atom; \
626 #include "atoms.xmacro"
629 property_handlers_init();
633 keysyms = xcb_key_symbols_alloc(conn);
635 xcb_numlock_mask = aio_get_mod_mask_for(XCB_NUM_LOCK, keysyms);
638 grab_all_keys(conn, false);
640 bool needs_tree_init = true;
642 LOG("Trying to restore the layout from %s...", layout_path);
643 needs_tree_init = !tree_restore(layout_path, greply);
644 if (delete_layout_path)
653 /* Setup fake outputs for testing */
654 if (fake_outputs == NULL && config.fake_outputs != NULL)
655 fake_outputs = config.fake_outputs;
657 if (fake_outputs != NULL) {
658 fake_outputs_init(fake_outputs);
660 config.fake_outputs = NULL;
661 } else if (force_xinerama || config.force_xinerama) {
662 /* Force Xinerama (for drivers which don't support RandR yet, esp. the
663 * nVidia binary graphics driver), when specified either in the config
664 * file or on command-line */
667 DLOG("Checking for XRandR...\n");
668 randr_init(&randr_base);
671 scratchpad_fix_resolution();
673 xcb_query_pointer_reply_t *pointerreply;
674 Output *output = NULL;
675 if (!(pointerreply = xcb_query_pointer_reply(conn, pointercookie, NULL))) {
676 ELOG("Could not query pointer position, using first screen\n");
678 DLOG("Pointer at %d, %d\n", pointerreply->root_x, pointerreply->root_y);
679 output = get_output_containing(pointerreply->root_x, pointerreply->root_y);
681 ELOG("ERROR: No screen at (%d, %d), starting on the first screen\n",
682 pointerreply->root_x, pointerreply->root_y);
683 output = get_first_output();
686 con_focus(con_descend_focused(output_get_content(output->con)));
691 /* Create the UNIX domain socket for IPC */
692 int ipc_socket = ipc_create_socket(config.ipc_socket_path);
693 if (ipc_socket == -1) {
694 ELOG("Could not create the IPC socket, IPC disabled\n");
696 free(config.ipc_socket_path);
697 struct ev_io *ipc_io = scalloc(sizeof(struct ev_io));
698 ev_io_init(ipc_io, ipc_new_client, ipc_socket, EV_READ);
699 ev_io_start(main_loop, ipc_io);
702 /* Also handle the UNIX domain sockets passed via socket activation. The
703 * parameter 1 means "remove the environment variables", we don’t want to
704 * pass these to child processes. */
705 listen_fds = sd_listen_fds(0);
707 ELOG("socket activation: Error in sd_listen_fds\n");
708 else if (listen_fds == 0)
709 DLOG("socket activation: no sockets passed\n");
712 for (int fd = SD_LISTEN_FDS_START;
713 fd < (SD_LISTEN_FDS_START + listen_fds);
715 DLOG("socket activation: also listening on fd %d\n", fd);
717 /* sd_listen_fds() enables FD_CLOEXEC by default.
718 * However, we need to keep the file descriptors open for in-place
719 * restarting, therefore we explicitly disable FD_CLOEXEC. */
720 if ((flags = fcntl(fd, F_GETFD)) < 0 ||
721 fcntl(fd, F_SETFD, flags & ~FD_CLOEXEC) < 0) {
722 ELOG("Could not disable FD_CLOEXEC on fd %d\n", fd);
725 struct ev_io *ipc_io = scalloc(sizeof(struct ev_io));
726 ev_io_init(ipc_io, ipc_new_client, fd, EV_READ);
727 ev_io_start(main_loop, ipc_io);
731 /* Set up i3 specific atoms like I3_SOCKET_PATH and I3_CONFIG_PATH */
734 struct ev_io *xcb_watcher = scalloc(sizeof(struct ev_io));
735 struct ev_io *xkb = scalloc(sizeof(struct ev_io));
736 struct ev_check *xcb_check = scalloc(sizeof(struct ev_check));
737 struct ev_prepare *xcb_prepare = scalloc(sizeof(struct ev_prepare));
739 ev_io_init(xcb_watcher, xcb_got_event, xcb_get_file_descriptor(conn), EV_READ);
740 ev_io_start(main_loop, xcb_watcher);
744 ev_io_init(xkb, xkb_got_event, ConnectionNumber(xkbdpy), EV_READ);
745 ev_io_start(main_loop, xkb);
747 /* Flush the buffer so that libev can properly get new events */
751 ev_check_init(xcb_check, xcb_check_cb);
752 ev_check_start(main_loop, xcb_check);
754 ev_prepare_init(xcb_prepare, xcb_prepare_cb);
755 ev_prepare_start(main_loop, xcb_prepare);
759 /* What follows is a fugly consequence of X11 protocol race conditions like
760 * the following: In an i3 in-place restart, i3 will reparent all windows
761 * to the root window, then exec() itself. In the new process, it calls
762 * manage_existing_windows. However, in case any application sent a
763 * generated UnmapNotify message to the WM (as GIMP does), this message
764 * will be handled by i3 *after* managing the window, thus i3 thinks the
765 * window just closed itself. In reality, the message was sent in the time
766 * period where i3 wasn’t running yet.
768 * To prevent this, we grab the server (disables processing of any other
769 * connections), then discard all pending events (since we didn’t do
770 * anything, there cannot be any meaningful responses), then ungrab the
772 xcb_grab_server(conn);
775 xcb_generic_event_t *event;
776 while ((event = xcb_poll_for_event(conn)) != NULL) {
779 manage_existing_windows(root);
781 xcb_ungrab_server(conn);
783 struct sigaction action;
785 action.sa_sigaction = handle_signal;
786 action.sa_flags = SA_NODEFER | SA_RESETHAND | SA_SIGINFO;
787 sigemptyset(&action.sa_mask);
789 if (!disable_signalhandler)
790 setup_signal_handler();
792 /* Catch all signals with default action "Core", see signal(7) */
793 if (sigaction(SIGQUIT, &action, NULL) == -1 ||
794 sigaction(SIGILL, &action, NULL) == -1 ||
795 sigaction(SIGABRT, &action, NULL) == -1 ||
796 sigaction(SIGFPE, &action, NULL) == -1 ||
797 sigaction(SIGSEGV, &action, NULL) == -1)
798 ELOG("Could not setup signal handler");
801 /* Catch all signals with default action "Term", see signal(7) */
802 if (sigaction(SIGHUP, &action, NULL) == -1 ||
803 sigaction(SIGINT, &action, NULL) == -1 ||
804 sigaction(SIGALRM, &action, NULL) == -1 ||
805 sigaction(SIGUSR1, &action, NULL) == -1 ||
806 sigaction(SIGUSR2, &action, NULL) == -1)
807 ELOG("Could not setup signal handler");
809 /* Ignore SIGPIPE to survive errors when an IPC client disconnects
810 * while we are sending him a message */
811 signal(SIGPIPE, SIG_IGN);
813 /* Autostarting exec-lines */
815 struct Autostart *exec;
816 TAILQ_FOREACH(exec, &autostarts, autostarts) {
817 LOG("auto-starting %s\n", exec->command);
818 start_application(exec->command, exec->no_startup_id);
822 /* Autostarting exec_always-lines */
823 struct Autostart *exec_always;
824 TAILQ_FOREACH(exec_always, &autostarts_always, autostarts_always) {
825 LOG("auto-starting (always!) %s\n", exec_always->command);
826 start_application(exec_always->command, exec_always->no_startup_id);
829 /* Start i3bar processes for all configured bars */
830 Barconfig *barconfig;
831 TAILQ_FOREACH(barconfig, &barconfigs, configs) {
832 char *command = NULL;
833 sasprintf(&command, "%s --bar_id=%s --socket=\"%s\"",
834 barconfig->i3bar_command ? barconfig->i3bar_command : "i3bar",
835 barconfig->id, current_socketpath);
836 LOG("Starting bar process: %s\n", command);
837 start_application(command, true);
841 /* Make sure to destroy the event loop to invoke the cleeanup callbacks
842 * when calling exit() */
845 ev_loop(main_loop, 0);