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 if (*shmlogname != '\0') {
237 shm_unlink(shmlogname);
242 int main(int argc, char *argv[]) {
243 /* Keep a symbol pointing to the I3_VERSION string constant so that we have
244 * it in gdb backtraces. */
245 const char *i3_version __attribute__ ((unused)) = I3_VERSION;
246 char *override_configpath = NULL;
247 bool autostart = true;
248 char *layout_path = NULL;
249 bool delete_layout_path = false;
250 bool force_xinerama = false;
251 char *fake_outputs = NULL;
252 bool disable_signalhandler = false;
253 static struct option long_options[] = {
254 {"no-autostart", no_argument, 0, 'a'},
255 {"config", required_argument, 0, 'c'},
256 {"version", no_argument, 0, 'v'},
257 {"moreversion", no_argument, 0, 'm'},
258 {"more-version", no_argument, 0, 'm'},
259 {"more_version", no_argument, 0, 'm'},
260 {"help", no_argument, 0, 'h'},
261 {"layout", required_argument, 0, 'L'},
262 {"restart", required_argument, 0, 0},
263 {"force-xinerama", no_argument, 0, 0},
264 {"force_xinerama", no_argument, 0, 0},
265 {"disable-signalhandler", no_argument, 0, 0},
266 {"shmlog-size", required_argument, 0, 0},
267 {"shmlog_size", required_argument, 0, 0},
268 {"get-socketpath", no_argument, 0, 0},
269 {"get_socketpath", no_argument, 0, 0},
270 {"fake_outputs", required_argument, 0, 0},
271 {"fake-outputs", required_argument, 0, 0},
274 int option_index = 0, opt;
276 setlocale(LC_ALL, "");
278 /* Get the RLIMIT_CORE limit at startup time to restore this before
279 * starting processes. */
280 getrlimit(RLIMIT_CORE, &original_rlimit_core);
282 /* Disable output buffering to make redirects in .xsession actually useful for debugging */
283 if (!isatty(fileno(stdout)))
284 setbuf(stdout, NULL);
288 /* Init logging *before* initializing debug_build to guarantee early
292 /* On non-release builds, disable SHM logging by default. */
293 shmlog_size = (is_debug_build() ? 25 * 1024 * 1024 : 0);
297 while ((opt = getopt_long(argc, argv, "c:CvmaL:hld:V", long_options, &option_index)) != -1) {
300 LOG("Autostart disabled using -a\n");
305 layout_path = sstrdup(optarg);
306 delete_layout_path = false;
309 FREE(override_configpath);
310 override_configpath = sstrdup(optarg);
313 LOG("Checking configuration file only (-C)\n");
314 only_check_config = true;
317 printf("i3 version " I3_VERSION " © 2009-2012 Michael Stapelberg and contributors\n");
321 printf("Binary i3 version: " I3_VERSION " © 2009-2012 Michael Stapelberg and contributors\n");
322 display_running_version();
329 LOG("Enabling debug logging\n");
330 set_debug_logging(true);
333 /* DEPRECATED, ignored for the next 3 versions (3.e, 3.f, 3.g) */
336 if (strcmp(long_options[option_index].name, "force-xinerama") == 0 ||
337 strcmp(long_options[option_index].name, "force_xinerama") == 0) {
338 force_xinerama = true;
339 ELOG("Using Xinerama instead of RandR. This option should be "
340 "avoided at all cost because it does not refresh the list "
341 "of screens, so you cannot configure displays at runtime. "
342 "Please check if your driver really does not support RandR "
343 "and disable this option as soon as you can.\n");
345 } else if (strcmp(long_options[option_index].name, "disable-signalhandler") == 0) {
346 disable_signalhandler = true;
348 } else if (strcmp(long_options[option_index].name, "get-socketpath") == 0 ||
349 strcmp(long_options[option_index].name, "get_socketpath") == 0) {
350 char *socket_path = root_atom_contents("I3_SOCKET_PATH");
352 printf("%s\n", socket_path);
357 } else if (strcmp(long_options[option_index].name, "shmlog-size") == 0 ||
358 strcmp(long_options[option_index].name, "shmlog_size") == 0) {
359 shmlog_size = atoi(optarg);
360 /* Re-initialize logging immediately to get as many
361 * logmessages as possible into the SHM log. */
363 LOG("Limiting SHM log size to %d bytes\n", shmlog_size);
365 } else if (strcmp(long_options[option_index].name, "restart") == 0) {
367 layout_path = sstrdup(optarg);
368 delete_layout_path = true;
370 } else if (strcmp(long_options[option_index].name, "fake-outputs") == 0 ||
371 strcmp(long_options[option_index].name, "fake_outputs") == 0) {
372 LOG("Initializing fake outputs: %s\n", optarg);
373 fake_outputs = sstrdup(optarg);
378 fprintf(stderr, "Usage: %s [-c configfile] [-d all] [-a] [-v] [-V] [-C]\n", argv[0]);
379 fprintf(stderr, "\n");
380 fprintf(stderr, "\t-a disable autostart ('exec' lines in config)\n");
381 fprintf(stderr, "\t-c <file> use the provided configfile instead\n");
382 fprintf(stderr, "\t-C validate configuration file and exit\n");
383 fprintf(stderr, "\t-d all enable debug output\n");
384 fprintf(stderr, "\t-L <file> path to the serialized layout during restarts\n");
385 fprintf(stderr, "\t-v display version and exit\n");
386 fprintf(stderr, "\t-V enable verbose mode\n");
387 fprintf(stderr, "\n");
388 fprintf(stderr, "\t--force-xinerama\n"
389 "\tUse Xinerama instead of RandR.\n"
390 "\tThis option should only be used if you are stuck with the\n"
391 "\told nVidia closed source driver (older than 302.17), which does\n"
392 "\tnot support RandR.\n");
393 fprintf(stderr, "\n");
394 fprintf(stderr, "\t--get-socketpath\n"
395 "\tRetrieve the i3 IPC socket path from X11, print it, then exit.\n");
396 fprintf(stderr, "\n");
397 fprintf(stderr, "\t--shmlog-size <limit>\n"
398 "\tLimits the size of the i3 SHM log to <limit> bytes. Setting this\n"
399 "\tto 0 disables SHM logging entirely.\n"
400 "\tThe default is %d bytes.\n", shmlog_size);
401 fprintf(stderr, "\n");
402 fprintf(stderr, "If you pass plain text arguments, i3 will interpret them as a command\n"
403 "to send to a currently running i3 (like i3-msg). This allows you to\n"
404 "use nice and logical commands, such as:\n"
407 "\ti3 floating toggle\n"
414 /* If the user passes more arguments, we act like i3-msg would: Just send
415 * the arguments as an IPC message to i3. This allows for nice semantic
416 * commands such as 'i3 border none'. */
417 if (!only_check_config && optind < argc) {
418 /* We enable verbose mode so that the user knows what’s going on.
419 * This should make it easier to find mistakes when the user passes
420 * arguments by mistake. */
423 LOG("Additional arguments passed. Sending them as a command to i3.\n");
424 char *payload = NULL;
425 while (optind < argc) {
427 payload = sstrdup(argv[optind]);
430 sasprintf(&both, "%s %s", payload, argv[optind]);
436 DLOG("Command is: %s (%zd bytes)\n", payload, strlen(payload));
437 char *socket_path = root_atom_contents("I3_SOCKET_PATH");
439 ELOG("Could not get i3 IPC socket path\n");
443 int sockfd = socket(AF_LOCAL, SOCK_STREAM, 0);
445 err(EXIT_FAILURE, "Could not create socket");
447 struct sockaddr_un addr;
448 memset(&addr, 0, sizeof(struct sockaddr_un));
449 addr.sun_family = AF_LOCAL;
450 strncpy(addr.sun_path, socket_path, sizeof(addr.sun_path) - 1);
451 if (connect(sockfd, (const struct sockaddr*)&addr, sizeof(struct sockaddr_un)) < 0)
452 err(EXIT_FAILURE, "Could not connect to i3");
454 if (ipc_send_message(sockfd, strlen(payload), I3_IPC_MESSAGE_TYPE_COMMAND,
455 (uint8_t*)payload) == -1)
456 err(EXIT_FAILURE, "IPC: write()");
458 uint32_t reply_length;
461 if ((ret = ipc_recv_message(sockfd, I3_IPC_MESSAGE_TYPE_COMMAND,
462 &reply_length, &reply)) != 0) {
464 err(EXIT_FAILURE, "IPC: read()");
467 printf("%.*s\n", reply_length, reply);
471 /* Enable logging to handle the case when the user did not specify --shmlog-size */
474 /* Try to enable core dumps by default when running a debug build */
475 if (is_debug_build()) {
476 struct rlimit limit = { RLIM_INFINITY, RLIM_INFINITY };
477 setrlimit(RLIMIT_CORE, &limit);
479 /* The following code is helpful, but not required. We thus don’t pay
480 * much attention to error handling, non-linux or other edge cases. */
482 LOG("CORE DUMPS: You are running a development version of i3, so coredumps were automatically enabled (ulimit -c unlimited).\n");
483 if (getcwd(cwd, sizeof(cwd)) != NULL)
484 LOG("CORE DUMPS: Your current working directory is \"%s\".\n", cwd);
486 if ((patternfd = open("/proc/sys/kernel/core_pattern", O_RDONLY)) >= 0) {
487 memset(cwd, '\0', sizeof(cwd));
488 if (read(patternfd, cwd, sizeof(cwd)) > 0)
489 /* a trailing newline is included in cwd */
490 LOG("CORE DUMPS: Your core_pattern is: %s", cwd);
495 LOG("i3 " I3_VERSION " starting\n");
497 conn = xcb_connect(NULL, &conn_screen);
498 if (xcb_connection_has_error(conn))
499 errx(EXIT_FAILURE, "Cannot open display\n");
501 sndisplay = sn_xcb_display_new(conn, NULL, NULL);
503 /* Initialize the libev event loop. This needs to be done before loading
504 * the config file because the parser will install an ev_child watcher
505 * for the nagbar when config errors are found. */
506 main_loop = EV_DEFAULT;
507 if (main_loop == NULL)
508 die("Could not initialize libev. Bad LIBEV_FLAGS?\n");
510 root_screen = xcb_aux_get_screen(conn, conn_screen);
511 root = root_screen->root;
513 /* By default, we use the same depth and visual as the root window, which
514 * usually is TrueColor (24 bit depth) and the corresponding visual.
515 * However, we also check if a 32 bit depth and visual are available (for
516 * transparency) and use it if so. */
517 root_depth = root_screen->root_depth;
518 visual_id = root_screen->root_visual;
519 colormap = root_screen->default_colormap;
521 DLOG("root_depth = %d, visual_id = 0x%08x.\n", root_depth, visual_id);
523 xcb_get_geometry_cookie_t gcookie = xcb_get_geometry(conn, root);
524 xcb_query_pointer_cookie_t pointercookie = xcb_query_pointer(conn, root);
526 load_configuration(conn, override_configpath, false);
527 if (only_check_config) {
528 LOG("Done checking configuration file. Exiting.\n");
532 if (config.ipc_socket_path == NULL) {
533 /* Fall back to a file name in /tmp/ based on the PID */
534 if ((config.ipc_socket_path = getenv("I3SOCK")) == NULL)
535 config.ipc_socket_path = get_process_filename("ipc-socket");
537 config.ipc_socket_path = sstrdup(config.ipc_socket_path);
540 uint32_t mask = XCB_CW_EVENT_MASK;
541 uint32_t values[] = { XCB_EVENT_MASK_SUBSTRUCTURE_REDIRECT |
542 XCB_EVENT_MASK_BUTTON_PRESS |
543 XCB_EVENT_MASK_STRUCTURE_NOTIFY | /* when the user adds a screen (e.g. video
544 projector), the root window gets a
546 XCB_EVENT_MASK_POINTER_MOTION |
547 XCB_EVENT_MASK_PROPERTY_CHANGE |
548 XCB_EVENT_MASK_ENTER_WINDOW };
549 xcb_void_cookie_t cookie;
550 cookie = xcb_change_window_attributes_checked(conn, root, mask, values);
551 check_error(conn, cookie, "Another window manager seems to be running");
553 xcb_get_geometry_reply_t *greply = xcb_get_geometry_reply(conn, gcookie, NULL);
554 if (greply == NULL) {
555 ELOG("Could not get geometry of the root window, exiting\n");
558 DLOG("root geometry reply: (%d, %d) %d x %d\n", greply->x, greply->y, greply->width, greply->height);
560 /* Place requests for the atoms we need as soon as possible */
561 #define xmacro(atom) \
562 xcb_intern_atom_cookie_t atom ## _cookie = xcb_intern_atom(conn, 0, strlen(#atom), #atom);
563 #include "atoms.xmacro"
566 /* Initialize the Xlib connection */
567 xlibdpy = xkbdpy = XOpenDisplay(NULL);
569 /* Try to load the X cursors and initialize the XKB extension */
570 if (xlibdpy == NULL) {
571 ELOG("ERROR: XOpenDisplay() failed, disabling libXcursor/XKB support\n");
572 xcursor_supported = false;
573 xkb_supported = false;
574 } else if (fcntl(ConnectionNumber(xlibdpy), F_SETFD, FD_CLOEXEC) == -1) {
575 ELOG("Could not set FD_CLOEXEC on xkbdpy\n");
578 xcursor_load_cursors();
582 /* Set a cursor for the root window (otherwise the root window will show no
583 cursor until the first client is launched). */
584 if (xcursor_supported)
585 xcursor_set_root_cursor(XCURSOR_CURSOR_POINTER);
586 else xcb_set_root_cursor(XCURSOR_CURSOR_POINTER);
590 major = XkbMajorVersion,
591 minor = XkbMinorVersion;
593 if (fcntl(ConnectionNumber(xkbdpy), F_SETFD, FD_CLOEXEC) == -1) {
594 fprintf(stderr, "Could not set FD_CLOEXEC on xkbdpy\n");
599 if (!XkbQueryExtension(xkbdpy,&i1,&xkb_event_base,&errBase,&major,&minor)) {
600 fprintf(stderr, "XKB not supported by X-server\n");
603 /* end of ugliness */
605 if (!XkbSelectEvents(xkbdpy, XkbUseCoreKbd,
606 XkbMapNotifyMask | XkbStateNotifyMask,
607 XkbMapNotifyMask | XkbStateNotifyMask)) {
608 fprintf(stderr, "Could not set XKB event mask\n");
613 /* Setup NetWM atoms */
614 #define xmacro(name) \
616 xcb_intern_atom_reply_t *reply = xcb_intern_atom_reply(conn, name ## _cookie, NULL); \
618 ELOG("Could not get atom " #name "\n"); \
621 A_ ## name = reply->atom; \
624 #include "atoms.xmacro"
627 property_handlers_init();
631 keysyms = xcb_key_symbols_alloc(conn);
633 xcb_numlock_mask = aio_get_mod_mask_for(XCB_NUM_LOCK, keysyms);
636 grab_all_keys(conn, false);
638 bool needs_tree_init = true;
640 LOG("Trying to restore the layout from %s...", layout_path);
641 needs_tree_init = !tree_restore(layout_path, greply);
642 if (delete_layout_path)
651 /* Setup fake outputs for testing */
652 if (fake_outputs == NULL && config.fake_outputs != NULL)
653 fake_outputs = config.fake_outputs;
655 if (fake_outputs != NULL) {
656 fake_outputs_init(fake_outputs);
658 config.fake_outputs = NULL;
659 } else if (force_xinerama || config.force_xinerama) {
660 /* Force Xinerama (for drivers which don't support RandR yet, esp. the
661 * nVidia binary graphics driver), when specified either in the config
662 * file or on command-line */
665 DLOG("Checking for XRandR...\n");
666 randr_init(&randr_base);
669 scratchpad_fix_resolution();
671 xcb_query_pointer_reply_t *pointerreply;
672 Output *output = NULL;
673 if (!(pointerreply = xcb_query_pointer_reply(conn, pointercookie, NULL))) {
674 ELOG("Could not query pointer position, using first screen\n");
676 DLOG("Pointer at %d, %d\n", pointerreply->root_x, pointerreply->root_y);
677 output = get_output_containing(pointerreply->root_x, pointerreply->root_y);
679 ELOG("ERROR: No screen at (%d, %d), starting on the first screen\n",
680 pointerreply->root_x, pointerreply->root_y);
681 output = get_first_output();
684 con_focus(con_descend_focused(output_get_content(output->con)));
689 /* Create the UNIX domain socket for IPC */
690 int ipc_socket = ipc_create_socket(config.ipc_socket_path);
691 if (ipc_socket == -1) {
692 ELOG("Could not create the IPC socket, IPC disabled\n");
694 free(config.ipc_socket_path);
695 struct ev_io *ipc_io = scalloc(sizeof(struct ev_io));
696 ev_io_init(ipc_io, ipc_new_client, ipc_socket, EV_READ);
697 ev_io_start(main_loop, ipc_io);
700 /* Also handle the UNIX domain sockets passed via socket activation. The
701 * parameter 1 means "remove the environment variables", we don’t want to
702 * pass these to child processes. */
703 listen_fds = sd_listen_fds(0);
705 ELOG("socket activation: Error in sd_listen_fds\n");
706 else if (listen_fds == 0)
707 DLOG("socket activation: no sockets passed\n");
710 for (int fd = SD_LISTEN_FDS_START;
711 fd < (SD_LISTEN_FDS_START + listen_fds);
713 DLOG("socket activation: also listening on fd %d\n", fd);
715 /* sd_listen_fds() enables FD_CLOEXEC by default.
716 * However, we need to keep the file descriptors open for in-place
717 * restarting, therefore we explicitly disable FD_CLOEXEC. */
718 if ((flags = fcntl(fd, F_GETFD)) < 0 ||
719 fcntl(fd, F_SETFD, flags & ~FD_CLOEXEC) < 0) {
720 ELOG("Could not disable FD_CLOEXEC on fd %d\n", fd);
723 struct ev_io *ipc_io = scalloc(sizeof(struct ev_io));
724 ev_io_init(ipc_io, ipc_new_client, fd, EV_READ);
725 ev_io_start(main_loop, ipc_io);
729 /* Set up i3 specific atoms like I3_SOCKET_PATH and I3_CONFIG_PATH */
732 struct ev_io *xcb_watcher = scalloc(sizeof(struct ev_io));
733 struct ev_io *xkb = scalloc(sizeof(struct ev_io));
734 struct ev_check *xcb_check = scalloc(sizeof(struct ev_check));
735 struct ev_prepare *xcb_prepare = scalloc(sizeof(struct ev_prepare));
737 ev_io_init(xcb_watcher, xcb_got_event, xcb_get_file_descriptor(conn), EV_READ);
738 ev_io_start(main_loop, xcb_watcher);
742 ev_io_init(xkb, xkb_got_event, ConnectionNumber(xkbdpy), EV_READ);
743 ev_io_start(main_loop, xkb);
745 /* Flush the buffer so that libev can properly get new events */
749 ev_check_init(xcb_check, xcb_check_cb);
750 ev_check_start(main_loop, xcb_check);
752 ev_prepare_init(xcb_prepare, xcb_prepare_cb);
753 ev_prepare_start(main_loop, xcb_prepare);
757 /* What follows is a fugly consequence of X11 protocol race conditions like
758 * the following: In an i3 in-place restart, i3 will reparent all windows
759 * to the root window, then exec() itself. In the new process, it calls
760 * manage_existing_windows. However, in case any application sent a
761 * generated UnmapNotify message to the WM (as GIMP does), this message
762 * will be handled by i3 *after* managing the window, thus i3 thinks the
763 * window just closed itself. In reality, the message was sent in the time
764 * period where i3 wasn’t running yet.
766 * To prevent this, we grab the server (disables processing of any other
767 * connections), then discard all pending events (since we didn’t do
768 * anything, there cannot be any meaningful responses), then ungrab the
770 xcb_grab_server(conn);
773 xcb_generic_event_t *event;
774 while ((event = xcb_poll_for_event(conn)) != NULL) {
777 manage_existing_windows(root);
779 xcb_ungrab_server(conn);
781 struct sigaction action;
783 action.sa_sigaction = handle_signal;
784 action.sa_flags = SA_NODEFER | SA_RESETHAND | SA_SIGINFO;
785 sigemptyset(&action.sa_mask);
787 if (!disable_signalhandler)
788 setup_signal_handler();
790 /* Catch all signals with default action "Core", see signal(7) */
791 if (sigaction(SIGQUIT, &action, NULL) == -1 ||
792 sigaction(SIGILL, &action, NULL) == -1 ||
793 sigaction(SIGABRT, &action, NULL) == -1 ||
794 sigaction(SIGFPE, &action, NULL) == -1 ||
795 sigaction(SIGSEGV, &action, NULL) == -1)
796 ELOG("Could not setup signal handler");
799 /* Catch all signals with default action "Term", see signal(7) */
800 if (sigaction(SIGHUP, &action, NULL) == -1 ||
801 sigaction(SIGINT, &action, NULL) == -1 ||
802 sigaction(SIGALRM, &action, NULL) == -1 ||
803 sigaction(SIGUSR1, &action, NULL) == -1 ||
804 sigaction(SIGUSR2, &action, NULL) == -1)
805 ELOG("Could not setup signal handler");
807 /* Ignore SIGPIPE to survive errors when an IPC client disconnects
808 * while we are sending him a message */
809 signal(SIGPIPE, SIG_IGN);
811 /* Autostarting exec-lines */
813 struct Autostart *exec;
814 TAILQ_FOREACH(exec, &autostarts, autostarts) {
815 LOG("auto-starting %s\n", exec->command);
816 start_application(exec->command, exec->no_startup_id);
820 /* Autostarting exec_always-lines */
821 struct Autostart *exec_always;
822 TAILQ_FOREACH(exec_always, &autostarts_always, autostarts_always) {
823 LOG("auto-starting (always!) %s\n", exec_always->command);
824 start_application(exec_always->command, exec_always->no_startup_id);
827 /* Start i3bar processes for all configured bars */
828 Barconfig *barconfig;
829 TAILQ_FOREACH(barconfig, &barconfigs, configs) {
830 char *command = NULL;
831 sasprintf(&command, "%s --bar_id=%s --socket=\"%s\"",
832 barconfig->i3bar_command ? barconfig->i3bar_command : "i3bar",
833 barconfig->id, current_socketpath);
834 LOG("Starting bar process: %s\n", command);
835 start_application(command, true);
839 /* Make sure to destroy the event loop to invoke the cleeanup callbacks
840 * when calling exit() */
843 ev_loop(main_loop, 0);