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},
272 {"force-old-config-parser-v4.4-only", no_argument, 0, 0},
275 int option_index = 0, opt;
277 setlocale(LC_ALL, "");
279 /* Get the RLIMIT_CORE limit at startup time to restore this before
280 * starting processes. */
281 getrlimit(RLIMIT_CORE, &original_rlimit_core);
283 /* Disable output buffering to make redirects in .xsession actually useful for debugging */
284 if (!isatty(fileno(stdout)))
285 setbuf(stdout, NULL);
289 /* Init logging *before* initializing debug_build to guarantee early
293 /* On non-release builds, disable SHM logging by default. */
294 shmlog_size = (is_debug_build() ? 25 * 1024 * 1024 : 0);
298 while ((opt = getopt_long(argc, argv, "c:CvmaL:hld:V", long_options, &option_index)) != -1) {
301 LOG("Autostart disabled using -a\n");
306 layout_path = sstrdup(optarg);
307 delete_layout_path = false;
310 FREE(override_configpath);
311 override_configpath = sstrdup(optarg);
314 LOG("Checking configuration file only (-C)\n");
315 only_check_config = true;
318 printf("i3 version " I3_VERSION " © 2009-2012 Michael Stapelberg and contributors\n");
322 printf("Binary i3 version: " I3_VERSION " © 2009-2012 Michael Stapelberg and contributors\n");
323 display_running_version();
330 LOG("Enabling debug logging\n");
331 set_debug_logging(true);
334 /* DEPRECATED, ignored for the next 3 versions (3.e, 3.f, 3.g) */
337 if (strcmp(long_options[option_index].name, "force-xinerama") == 0 ||
338 strcmp(long_options[option_index].name, "force_xinerama") == 0) {
339 force_xinerama = true;
340 ELOG("Using Xinerama instead of RandR. This option should be "
341 "avoided at all cost because it does not refresh the list "
342 "of screens, so you cannot configure displays at runtime. "
343 "Please check if your driver really does not support RandR "
344 "and disable this option as soon as you can.\n");
346 } else if (strcmp(long_options[option_index].name, "disable-signalhandler") == 0) {
347 disable_signalhandler = true;
349 } else if (strcmp(long_options[option_index].name, "get-socketpath") == 0 ||
350 strcmp(long_options[option_index].name, "get_socketpath") == 0) {
351 char *socket_path = root_atom_contents("I3_SOCKET_PATH");
353 printf("%s\n", socket_path);
358 } else if (strcmp(long_options[option_index].name, "shmlog-size") == 0 ||
359 strcmp(long_options[option_index].name, "shmlog_size") == 0) {
360 shmlog_size = atoi(optarg);
361 /* Re-initialize logging immediately to get as many
362 * logmessages as possible into the SHM log. */
364 LOG("Limiting SHM log size to %d bytes\n", shmlog_size);
366 } else if (strcmp(long_options[option_index].name, "restart") == 0) {
368 layout_path = sstrdup(optarg);
369 delete_layout_path = true;
371 } else if (strcmp(long_options[option_index].name, "fake-outputs") == 0 ||
372 strcmp(long_options[option_index].name, "fake_outputs") == 0) {
373 LOG("Initializing fake outputs: %s\n", optarg);
374 fake_outputs = sstrdup(optarg);
376 } else if (strcmp(long_options[option_index].name, "force-old-config-parser-v4.4-only") == 0) {
377 LOG("FORCING OLD CONFIG PARSER!\n");
378 force_old_config_parser = true;
383 fprintf(stderr, "Usage: %s [-c configfile] [-d all] [-a] [-v] [-V] [-C]\n", argv[0]);
384 fprintf(stderr, "\n");
385 fprintf(stderr, "\t-a disable autostart ('exec' lines in config)\n");
386 fprintf(stderr, "\t-c <file> use the provided configfile instead\n");
387 fprintf(stderr, "\t-C validate configuration file and exit\n");
388 fprintf(stderr, "\t-d all enable debug output\n");
389 fprintf(stderr, "\t-L <file> path to the serialized layout during restarts\n");
390 fprintf(stderr, "\t-v display version and exit\n");
391 fprintf(stderr, "\t-V enable verbose mode\n");
392 fprintf(stderr, "\n");
393 fprintf(stderr, "\t--force-xinerama\n"
394 "\tUse Xinerama instead of RandR.\n"
395 "\tThis option should only be used if you are stuck with the\n"
396 "\told nVidia closed source driver (older than 302.17), which does\n"
397 "\tnot support RandR.\n");
398 fprintf(stderr, "\n");
399 fprintf(stderr, "\t--get-socketpath\n"
400 "\tRetrieve the i3 IPC socket path from X11, print it, then exit.\n");
401 fprintf(stderr, "\n");
402 fprintf(stderr, "\t--shmlog-size <limit>\n"
403 "\tLimits the size of the i3 SHM log to <limit> bytes. Setting this\n"
404 "\tto 0 disables SHM logging entirely.\n"
405 "\tThe default is %d bytes.\n", shmlog_size);
406 fprintf(stderr, "\n");
407 fprintf(stderr, "If you pass plain text arguments, i3 will interpret them as a command\n"
408 "to send to a currently running i3 (like i3-msg). This allows you to\n"
409 "use nice and logical commands, such as:\n"
412 "\ti3 floating toggle\n"
419 /* If the user passes more arguments, we act like i3-msg would: Just send
420 * the arguments as an IPC message to i3. This allows for nice semantic
421 * commands such as 'i3 border none'. */
422 if (!only_check_config && optind < argc) {
423 /* We enable verbose mode so that the user knows what’s going on.
424 * This should make it easier to find mistakes when the user passes
425 * arguments by mistake. */
428 LOG("Additional arguments passed. Sending them as a command to i3.\n");
429 char *payload = NULL;
430 while (optind < argc) {
432 payload = sstrdup(argv[optind]);
435 sasprintf(&both, "%s %s", payload, argv[optind]);
441 DLOG("Command is: %s (%zd bytes)\n", payload, strlen(payload));
442 char *socket_path = root_atom_contents("I3_SOCKET_PATH");
444 ELOG("Could not get i3 IPC socket path\n");
448 int sockfd = socket(AF_LOCAL, SOCK_STREAM, 0);
450 err(EXIT_FAILURE, "Could not create socket");
452 struct sockaddr_un addr;
453 memset(&addr, 0, sizeof(struct sockaddr_un));
454 addr.sun_family = AF_LOCAL;
455 strncpy(addr.sun_path, socket_path, sizeof(addr.sun_path) - 1);
456 if (connect(sockfd, (const struct sockaddr*)&addr, sizeof(struct sockaddr_un)) < 0)
457 err(EXIT_FAILURE, "Could not connect to i3");
459 if (ipc_send_message(sockfd, strlen(payload), I3_IPC_MESSAGE_TYPE_COMMAND,
460 (uint8_t*)payload) == -1)
461 err(EXIT_FAILURE, "IPC: write()");
463 uint32_t reply_length;
466 if ((ret = ipc_recv_message(sockfd, I3_IPC_MESSAGE_TYPE_COMMAND,
467 &reply_length, &reply)) != 0) {
469 err(EXIT_FAILURE, "IPC: read()");
472 printf("%.*s\n", reply_length, reply);
476 /* Enable logging to handle the case when the user did not specify --shmlog-size */
479 /* Try to enable core dumps by default when running a debug build */
480 if (is_debug_build()) {
481 struct rlimit limit = { RLIM_INFINITY, RLIM_INFINITY };
482 setrlimit(RLIMIT_CORE, &limit);
484 /* The following code is helpful, but not required. We thus don’t pay
485 * much attention to error handling, non-linux or other edge cases. */
487 LOG("CORE DUMPS: You are running a development version of i3, so coredumps were automatically enabled (ulimit -c unlimited).\n");
488 if (getcwd(cwd, sizeof(cwd)) != NULL)
489 LOG("CORE DUMPS: Your current working directory is \"%s\".\n", cwd);
491 if ((patternfd = open("/proc/sys/kernel/core_pattern", O_RDONLY)) >= 0) {
492 memset(cwd, '\0', sizeof(cwd));
493 if (read(patternfd, cwd, sizeof(cwd)) > 0)
494 /* a trailing newline is included in cwd */
495 LOG("CORE DUMPS: Your core_pattern is: %s", cwd);
500 LOG("i3 " I3_VERSION " starting\n");
502 conn = xcb_connect(NULL, &conn_screen);
503 if (xcb_connection_has_error(conn))
504 errx(EXIT_FAILURE, "Cannot open display\n");
506 sndisplay = sn_xcb_display_new(conn, NULL, NULL);
508 /* Initialize the libev event loop. This needs to be done before loading
509 * the config file because the parser will install an ev_child watcher
510 * for the nagbar when config errors are found. */
511 main_loop = EV_DEFAULT;
512 if (main_loop == NULL)
513 die("Could not initialize libev. Bad LIBEV_FLAGS?\n");
515 root_screen = xcb_aux_get_screen(conn, conn_screen);
516 root = root_screen->root;
518 /* By default, we use the same depth and visual as the root window, which
519 * usually is TrueColor (24 bit depth) and the corresponding visual.
520 * However, we also check if a 32 bit depth and visual are available (for
521 * transparency) and use it if so. */
522 root_depth = root_screen->root_depth;
523 visual_id = root_screen->root_visual;
524 colormap = root_screen->default_colormap;
526 DLOG("root_depth = %d, visual_id = 0x%08x.\n", root_depth, visual_id);
528 xcb_get_geometry_cookie_t gcookie = xcb_get_geometry(conn, root);
529 xcb_query_pointer_cookie_t pointercookie = xcb_query_pointer(conn, root);
531 load_configuration(conn, override_configpath, false);
532 if (only_check_config) {
533 LOG("Done checking configuration file. Exiting.\n");
537 if (config.ipc_socket_path == NULL) {
538 /* Fall back to a file name in /tmp/ based on the PID */
539 if ((config.ipc_socket_path = getenv("I3SOCK")) == NULL)
540 config.ipc_socket_path = get_process_filename("ipc-socket");
542 config.ipc_socket_path = sstrdup(config.ipc_socket_path);
545 uint32_t mask = XCB_CW_EVENT_MASK;
546 uint32_t values[] = { XCB_EVENT_MASK_SUBSTRUCTURE_REDIRECT |
547 XCB_EVENT_MASK_BUTTON_PRESS |
548 XCB_EVENT_MASK_STRUCTURE_NOTIFY | /* when the user adds a screen (e.g. video
549 projector), the root window gets a
551 XCB_EVENT_MASK_POINTER_MOTION |
552 XCB_EVENT_MASK_PROPERTY_CHANGE |
553 XCB_EVENT_MASK_ENTER_WINDOW };
554 xcb_void_cookie_t cookie;
555 cookie = xcb_change_window_attributes_checked(conn, root, mask, values);
556 check_error(conn, cookie, "Another window manager seems to be running");
558 xcb_get_geometry_reply_t *greply = xcb_get_geometry_reply(conn, gcookie, NULL);
559 if (greply == NULL) {
560 ELOG("Could not get geometry of the root window, exiting\n");
563 DLOG("root geometry reply: (%d, %d) %d x %d\n", greply->x, greply->y, greply->width, greply->height);
565 /* Place requests for the atoms we need as soon as possible */
566 #define xmacro(atom) \
567 xcb_intern_atom_cookie_t atom ## _cookie = xcb_intern_atom(conn, 0, strlen(#atom), #atom);
568 #include "atoms.xmacro"
571 /* Initialize the Xlib connection */
572 xlibdpy = xkbdpy = XOpenDisplay(NULL);
574 /* Try to load the X cursors and initialize the XKB extension */
575 if (xlibdpy == NULL) {
576 ELOG("ERROR: XOpenDisplay() failed, disabling libXcursor/XKB support\n");
577 xcursor_supported = false;
578 xkb_supported = false;
579 } else if (fcntl(ConnectionNumber(xlibdpy), F_SETFD, FD_CLOEXEC) == -1) {
580 ELOG("Could not set FD_CLOEXEC on xkbdpy\n");
583 xcursor_load_cursors();
587 /* Set a cursor for the root window (otherwise the root window will show no
588 cursor until the first client is launched). */
589 if (xcursor_supported)
590 xcursor_set_root_cursor(XCURSOR_CURSOR_POINTER);
591 else xcb_set_root_cursor(XCURSOR_CURSOR_POINTER);
595 major = XkbMajorVersion,
596 minor = XkbMinorVersion;
598 if (fcntl(ConnectionNumber(xkbdpy), F_SETFD, FD_CLOEXEC) == -1) {
599 fprintf(stderr, "Could not set FD_CLOEXEC on xkbdpy\n");
604 if (!XkbQueryExtension(xkbdpy,&i1,&xkb_event_base,&errBase,&major,&minor)) {
605 fprintf(stderr, "XKB not supported by X-server\n");
608 /* end of ugliness */
610 if (!XkbSelectEvents(xkbdpy, XkbUseCoreKbd,
611 XkbMapNotifyMask | XkbStateNotifyMask,
612 XkbMapNotifyMask | XkbStateNotifyMask)) {
613 fprintf(stderr, "Could not set XKB event mask\n");
618 /* Setup NetWM atoms */
619 #define xmacro(name) \
621 xcb_intern_atom_reply_t *reply = xcb_intern_atom_reply(conn, name ## _cookie, NULL); \
623 ELOG("Could not get atom " #name "\n"); \
626 A_ ## name = reply->atom; \
629 #include "atoms.xmacro"
632 property_handlers_init();
636 keysyms = xcb_key_symbols_alloc(conn);
638 xcb_numlock_mask = aio_get_mod_mask_for(XCB_NUM_LOCK, keysyms);
641 grab_all_keys(conn, false);
643 bool needs_tree_init = true;
645 LOG("Trying to restore the layout from %s...", layout_path);
646 needs_tree_init = !tree_restore(layout_path, greply);
647 if (delete_layout_path)
656 /* Setup fake outputs for testing */
657 if (fake_outputs == NULL && config.fake_outputs != NULL)
658 fake_outputs = config.fake_outputs;
660 if (fake_outputs != NULL) {
661 fake_outputs_init(fake_outputs);
663 config.fake_outputs = NULL;
664 } else if (force_xinerama || config.force_xinerama) {
665 /* Force Xinerama (for drivers which don't support RandR yet, esp. the
666 * nVidia binary graphics driver), when specified either in the config
667 * file or on command-line */
670 DLOG("Checking for XRandR...\n");
671 randr_init(&randr_base);
674 scratchpad_fix_resolution();
676 xcb_query_pointer_reply_t *pointerreply;
677 Output *output = NULL;
678 if (!(pointerreply = xcb_query_pointer_reply(conn, pointercookie, NULL))) {
679 ELOG("Could not query pointer position, using first screen\n");
681 DLOG("Pointer at %d, %d\n", pointerreply->root_x, pointerreply->root_y);
682 output = get_output_containing(pointerreply->root_x, pointerreply->root_y);
684 ELOG("ERROR: No screen at (%d, %d), starting on the first screen\n",
685 pointerreply->root_x, pointerreply->root_y);
686 output = get_first_output();
689 con_focus(con_descend_focused(output_get_content(output->con)));
694 /* Create the UNIX domain socket for IPC */
695 int ipc_socket = ipc_create_socket(config.ipc_socket_path);
696 if (ipc_socket == -1) {
697 ELOG("Could not create the IPC socket, IPC disabled\n");
699 free(config.ipc_socket_path);
700 struct ev_io *ipc_io = scalloc(sizeof(struct ev_io));
701 ev_io_init(ipc_io, ipc_new_client, ipc_socket, EV_READ);
702 ev_io_start(main_loop, ipc_io);
705 /* Also handle the UNIX domain sockets passed via socket activation. The
706 * parameter 1 means "remove the environment variables", we don’t want to
707 * pass these to child processes. */
708 listen_fds = sd_listen_fds(0);
710 ELOG("socket activation: Error in sd_listen_fds\n");
711 else if (listen_fds == 0)
712 DLOG("socket activation: no sockets passed\n");
715 for (int fd = SD_LISTEN_FDS_START;
716 fd < (SD_LISTEN_FDS_START + listen_fds);
718 DLOG("socket activation: also listening on fd %d\n", fd);
720 /* sd_listen_fds() enables FD_CLOEXEC by default.
721 * However, we need to keep the file descriptors open for in-place
722 * restarting, therefore we explicitly disable FD_CLOEXEC. */
723 if ((flags = fcntl(fd, F_GETFD)) < 0 ||
724 fcntl(fd, F_SETFD, flags & ~FD_CLOEXEC) < 0) {
725 ELOG("Could not disable FD_CLOEXEC on fd %d\n", fd);
728 struct ev_io *ipc_io = scalloc(sizeof(struct ev_io));
729 ev_io_init(ipc_io, ipc_new_client, fd, EV_READ);
730 ev_io_start(main_loop, ipc_io);
734 /* Set up i3 specific atoms like I3_SOCKET_PATH and I3_CONFIG_PATH */
737 struct ev_io *xcb_watcher = scalloc(sizeof(struct ev_io));
738 struct ev_io *xkb = scalloc(sizeof(struct ev_io));
739 struct ev_check *xcb_check = scalloc(sizeof(struct ev_check));
740 struct ev_prepare *xcb_prepare = scalloc(sizeof(struct ev_prepare));
742 ev_io_init(xcb_watcher, xcb_got_event, xcb_get_file_descriptor(conn), EV_READ);
743 ev_io_start(main_loop, xcb_watcher);
747 ev_io_init(xkb, xkb_got_event, ConnectionNumber(xkbdpy), EV_READ);
748 ev_io_start(main_loop, xkb);
750 /* Flush the buffer so that libev can properly get new events */
754 ev_check_init(xcb_check, xcb_check_cb);
755 ev_check_start(main_loop, xcb_check);
757 ev_prepare_init(xcb_prepare, xcb_prepare_cb);
758 ev_prepare_start(main_loop, xcb_prepare);
762 /* What follows is a fugly consequence of X11 protocol race conditions like
763 * the following: In an i3 in-place restart, i3 will reparent all windows
764 * to the root window, then exec() itself. In the new process, it calls
765 * manage_existing_windows. However, in case any application sent a
766 * generated UnmapNotify message to the WM (as GIMP does), this message
767 * will be handled by i3 *after* managing the window, thus i3 thinks the
768 * window just closed itself. In reality, the message was sent in the time
769 * period where i3 wasn’t running yet.
771 * To prevent this, we grab the server (disables processing of any other
772 * connections), then discard all pending events (since we didn’t do
773 * anything, there cannot be any meaningful responses), then ungrab the
775 xcb_grab_server(conn);
778 xcb_generic_event_t *event;
779 while ((event = xcb_poll_for_event(conn)) != NULL) {
782 manage_existing_windows(root);
784 xcb_ungrab_server(conn);
786 struct sigaction action;
788 action.sa_sigaction = handle_signal;
789 action.sa_flags = SA_NODEFER | SA_RESETHAND | SA_SIGINFO;
790 sigemptyset(&action.sa_mask);
792 if (!disable_signalhandler)
793 setup_signal_handler();
795 /* Catch all signals with default action "Core", see signal(7) */
796 if (sigaction(SIGQUIT, &action, NULL) == -1 ||
797 sigaction(SIGILL, &action, NULL) == -1 ||
798 sigaction(SIGABRT, &action, NULL) == -1 ||
799 sigaction(SIGFPE, &action, NULL) == -1 ||
800 sigaction(SIGSEGV, &action, NULL) == -1)
801 ELOG("Could not setup signal handler");
804 /* Catch all signals with default action "Term", see signal(7) */
805 if (sigaction(SIGHUP, &action, NULL) == -1 ||
806 sigaction(SIGINT, &action, NULL) == -1 ||
807 sigaction(SIGALRM, &action, NULL) == -1 ||
808 sigaction(SIGUSR1, &action, NULL) == -1 ||
809 sigaction(SIGUSR2, &action, NULL) == -1)
810 ELOG("Could not setup signal handler");
812 /* Ignore SIGPIPE to survive errors when an IPC client disconnects
813 * while we are sending him a message */
814 signal(SIGPIPE, SIG_IGN);
816 /* Autostarting exec-lines */
818 struct Autostart *exec;
819 TAILQ_FOREACH(exec, &autostarts, autostarts) {
820 LOG("auto-starting %s\n", exec->command);
821 start_application(exec->command, exec->no_startup_id);
825 /* Autostarting exec_always-lines */
826 struct Autostart *exec_always;
827 TAILQ_FOREACH(exec_always, &autostarts_always, autostarts_always) {
828 LOG("auto-starting (always!) %s\n", exec_always->command);
829 start_application(exec_always->command, exec_always->no_startup_id);
832 /* Start i3bar processes for all configured bars */
833 Barconfig *barconfig;
834 TAILQ_FOREACH(barconfig, &barconfigs, configs) {
835 char *command = NULL;
836 sasprintf(&command, "%s --bar_id=%s --socket=\"%s\"",
837 barconfig->i3bar_command ? barconfig->i3bar_command : "i3bar",
838 barconfig->id, current_socketpath);
839 LOG("Starting bar process: %s\n", command);
840 start_application(command, true);
844 /* Make sure to destroy the event loop to invoke the cleeanup callbacks
845 * when calling exit() */
848 ev_loop(main_loop, 0);